fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 107                 const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                 const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         label->lfs = 0;
 126         label->pi = 0;
 127         label->len = 0;
 128         label->label = NULL;
 129
 130         err = security_dentry_init_security(dentry, sattr->ia_mode,
 131                                 &dentry->d_name, NULL,
 132                                 (void **)&label->label, &label->len);
 133         if (err == 0)
 134                 return label;
 135
 136         return NULL;
 137 }
 138 static inline void
 139 nfs4_label_release_security(struct nfs4_label *label)
 140 {
 141         if (label)
 142                 security_release_secctx(label->label, label->len);
 143 }
 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 145 {
 146         if (label)
 147                 return server->attr_bitmask;
 148
 149         return server->attr_bitmask_nl;
 150 }
 151 #else
 152 static inline struct nfs4_label *
 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 154         struct iattr *sattr, struct nfs4_label *l)
 155 { return NULL; }
 156 static inline void
 157 nfs4_label_release_security(struct nfs4_label *label)
 158 { return; }
 159 static inline u32 *
 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 161 { return server->attr_bitmask; }
 162 #endif
 163
 164 /* Prevent leaks of NFSv4 errors into userland */
 165 static int nfs4_map_errors(int err)
 166 {
 167         if (err >= -1000)
 168                 return err;
 169         switch (err) {
 170         case -NFS4ERR_RESOURCE:
 171         case -NFS4ERR_LAYOUTTRYLATER:
 172         case -NFS4ERR_RECALLCONFLICT:
 173         case -NFS4ERR_RETURNCONFLICT:
 174                 return -EREMOTEIO;
 175         case -NFS4ERR_WRONGSEC:
 176         case -NFS4ERR_WRONG_CRED:
 177                 return -EPERM;
 178         case -NFS4ERR_BADOWNER:
 179         case -NFS4ERR_BADNAME:
 180                 return -EINVAL;
 181         case -NFS4ERR_SHARE_DENIED:
 182                 return -EACCES;
 183         case -NFS4ERR_MINOR_VERS_MISMATCH:
 184                 return -EPROTONOSUPPORT;
 185         case -NFS4ERR_FILE_OPEN:
 186                 return -EBUSY;
 187         case -NFS4ERR_NOT_SAME:
 188                 return -ENOTSYNC;
 189         default:
 190                 dprintk("%s could not handle NFSv4 error %d\n",
 191                                 __func__, -err);
 192                 break;
 193         }
 194         return -EIO;
 195 }
 196
 197 /*
 198  * This is our standard bitmap for GETATTR requests.
 199  */
 200 const u32 nfs4_fattr_bitmap[3] = {
 201         FATTR4_WORD0_TYPE
 202         | FATTR4_WORD0_CHANGE
 203         | FATTR4_WORD0_SIZE
 204         | FATTR4_WORD0_FSID
 205         | FATTR4_WORD0_FILEID,
 206         FATTR4_WORD1_MODE
 207         | FATTR4_WORD1_NUMLINKS
 208         | FATTR4_WORD1_OWNER
 209         | FATTR4_WORD1_OWNER_GROUP
 210         | FATTR4_WORD1_RAWDEV
 211         | FATTR4_WORD1_SPACE_USED
 212         | FATTR4_WORD1_TIME_ACCESS
 213         | FATTR4_WORD1_TIME_METADATA
 214         | FATTR4_WORD1_TIME_MODIFY
 215         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 217         FATTR4_WORD2_SECURITY_LABEL
 218 #endif
 219 };
 220
 221 static const u32 nfs4_pnfs_open_bitmap[3] = {
 222         FATTR4_WORD0_TYPE
 223         | FATTR4_WORD0_CHANGE
 224         | FATTR4_WORD0_SIZE
 225         | FATTR4_WORD0_FSID
 226         | FATTR4_WORD0_FILEID,
 227         FATTR4_WORD1_MODE
 228         | FATTR4_WORD1_NUMLINKS
 229         | FATTR4_WORD1_OWNER
 230         | FATTR4_WORD1_OWNER_GROUP
 231         | FATTR4_WORD1_RAWDEV
 232         | FATTR4_WORD1_SPACE_USED
 233         | FATTR4_WORD1_TIME_ACCESS
 234         | FATTR4_WORD1_TIME_METADATA
 235         | FATTR4_WORD1_TIME_MODIFY,
 236         FATTR4_WORD2_MDSTHRESHOLD
 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 238         | FATTR4_WORD2_SECURITY_LABEL
 239 #endif
 240 };
 241
 242 static const u32 nfs4_open_noattr_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_FILEID,
 245 };
 246
 247 const u32 nfs4_statfs_bitmap[3] = {
 248         FATTR4_WORD0_FILES_AVAIL
 249         | FATTR4_WORD0_FILES_FREE
 250         | FATTR4_WORD0_FILES_TOTAL,
 251         FATTR4_WORD1_SPACE_AVAIL
 252         | FATTR4_WORD1_SPACE_FREE
 253         | FATTR4_WORD1_SPACE_TOTAL
 254 };
 255
 256 const u32 nfs4_pathconf_bitmap[3] = {
 257         FATTR4_WORD0_MAXLINK
 258         | FATTR4_WORD0_MAXNAME,
 259         0
 260 };
 261
 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 263                         | FATTR4_WORD0_MAXREAD
 264                         | FATTR4_WORD0_MAXWRITE
 265                         | FATTR4_WORD0_LEASE_TIME,
 266                         FATTR4_WORD1_TIME_DELTA
 267                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 268                         FATTR4_WORD2_LAYOUT_BLKSIZE
 269                         | FATTR4_WORD2_CLONE_BLKSIZE
 270                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 271                         | FATTR4_WORD2_XATTR_SUPPORT
 272 };
 273
 274 const u32 nfs4_fs_locations_bitmap[3] = {
 275         FATTR4_WORD0_CHANGE
 276         | FATTR4_WORD0_SIZE
 277         | FATTR4_WORD0_FSID
 278         | FATTR4_WORD0_FILEID
 279         | FATTR4_WORD0_FS_LOCATIONS,
 280         FATTR4_WORD1_OWNER
 281         | FATTR4_WORD1_OWNER_GROUP
 282         | FATTR4_WORD1_RAWDEV
 283         | FATTR4_WORD1_SPACE_USED
 284         | FATTR4_WORD1_TIME_ACCESS
 285         | FATTR4_WORD1_TIME_METADATA
 286         | FATTR4_WORD1_TIME_MODIFY
 287         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 288 };
 289
 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 291                                     struct inode *inode, unsigned long flags)
 292 {
 293         unsigned long cache_validity;
 294
 295         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 296         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 297                 return;
 298
 299         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 300
 301         /* Remove the attributes over which we have full control */
 302         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 303         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 304                 dst[0] &= ~FATTR4_WORD0_SIZE;
 305
 306         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 307                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 308
 309         if (!(cache_validity & NFS_INO_INVALID_MODE))
 310                 dst[1] &= ~FATTR4_WORD1_MODE;
 311         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 312                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 313 }
 314
 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 316                 struct nfs4_readdir_arg *readdir)
 317 {
 318         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 319         __be32 *start, *p;
 320
 321         if (cookie > 2) {
 322                 readdir->cookie = cookie;
 323                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 324                 return;
 325         }
 326
 327         readdir->cookie = 0;
 328         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 329         if (cookie == 2)
 330                 return;
 331
 332         /*
 333          * NFSv4 servers do not return entries for '.' and '..'
 334          * Therefore, we fake these entries here.  We let '.'
 335          * have cookie 0 and '..' have cookie 1.  Note that
 336          * when talking to the server, we always send cookie 0
 337          * instead of 1 or 2.
 338          */
 339         start = p = kmap_atomic(*readdir->pages);
 340
 341         if (cookie == 0) {
 342                 *p++ = xdr_one;                                  /* next */
 343                 *p++ = xdr_zero;                   /* cookie, first word */
 344                 *p++ = xdr_one;                   /* cookie, second word */
 345                 *p++ = xdr_one;                             /* entry len */
 346                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 347                 p++;
 348                 *p++ = xdr_one;                         /* bitmap length */
 349                 *p++ = htonl(attrs);                           /* bitmap */
 350                 *p++ = htonl(12);             /* attribute buffer length */
 351                 *p++ = htonl(NF4DIR);
 352                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 353         }
 354
 355         *p++ = xdr_one;                                  /* next */
 356         *p++ = xdr_zero;                   /* cookie, first word */
 357         *p++ = xdr_two;                   /* cookie, second word */
 358         *p++ = xdr_two;                             /* entry len */
 359         memcpy(p, "..\0\0", 4);                         /* entry */
 360         p++;
 361         *p++ = xdr_one;                         /* bitmap length */
 362         *p++ = htonl(attrs);                           /* bitmap */
 363         *p++ = htonl(12);             /* attribute buffer length */
 364         *p++ = htonl(NF4DIR);
 365         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 366
 367         readdir->pgbase = (char *)p - (char *)start;
 368         readdir->count -= readdir->pgbase;
 369         kunmap_atomic(start);
 370 }
 371
 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 373 {
 374         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 375                 fattr->pre_change_attr = version;
 376                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 377         }
 378 }
 379
 380 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 381                 nfs4_stateid *stateid,
 382                 const struct cred *cred)
 383 {
 384         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 385
 386         ops->test_and_free_expired(server, stateid, cred);
 387 }
 388
 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 390                 nfs4_stateid *stateid,
 391                 const struct cred *cred)
 392 {
 393         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 394         nfs4_test_and_free_stateid(server, stateid, cred);
 395 }
 396
 397 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 398                 const nfs4_stateid *stateid,
 399                 const struct cred *cred)
 400 {
 401         nfs4_stateid tmp;
 402
 403         nfs4_stateid_copy(&tmp, stateid);
 404         __nfs4_free_revoked_stateid(server, &tmp, cred);
 405 }
 406
 407 static long nfs4_update_delay(long *timeout)
 408 {
 409         long ret;
 410         if (!timeout)
 411                 return NFS4_POLL_RETRY_MAX;
 412         if (*timeout <= 0)
 413                 *timeout = NFS4_POLL_RETRY_MIN;
 414         if (*timeout > NFS4_POLL_RETRY_MAX)
 415                 *timeout = NFS4_POLL_RETRY_MAX;
 416         ret = *timeout;
 417         *timeout <<= 1;
 418         return ret;
 419 }
 420
 421 static int nfs4_delay_killable(long *timeout)
 422 {
 423         might_sleep();
 424
 425         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 426         schedule_timeout(nfs4_update_delay(timeout));
 427         if (!__fatal_signal_pending(current))
 428                 return 0;
 429         return -EINTR;
 430 }
 431
 432 static int nfs4_delay_interruptible(long *timeout)
 433 {
 434         might_sleep();
 435
 436         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 437         schedule_timeout(nfs4_update_delay(timeout));
 438         if (!signal_pending(current))
 439                 return 0;
 440         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 441 }
 442
 443 static int nfs4_delay(long *timeout, bool interruptible)
 444 {
 445         if (interruptible)
 446                 return nfs4_delay_interruptible(timeout);
 447         return nfs4_delay_killable(timeout);
 448 }
 449
 450 static const nfs4_stateid *
 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 452 {
 453         if (!stateid)
 454                 return NULL;
 455         switch (stateid->type) {
 456         case NFS4_OPEN_STATEID_TYPE:
 457         case NFS4_LOCK_STATEID_TYPE:
 458         case NFS4_DELEGATION_STATEID_TYPE:
 459                 return stateid;
 460         default:
 461                 break;
 462         }
 463         return NULL;
 464 }
 465
 466 /* This is the error handling routine for processes that are allowed
 467  * to sleep.
 468  */
 469 static int nfs4_do_handle_exception(struct nfs_server *server,
 470                 int errorcode, struct nfs4_exception *exception)
 471 {
 472         struct nfs_client *clp = server->nfs_client;
 473         struct nfs4_state *state = exception->state;
 474         const nfs4_stateid *stateid;
 475         struct inode *inode = exception->inode;
 476         int ret = errorcode;
 477
 478         exception->delay = 0;
 479         exception->recovering = 0;
 480         exception->retry = 0;
 481
 482         stateid = nfs4_recoverable_stateid(exception->stateid);
 483         if (stateid == NULL && state != NULL)
 484                 stateid = nfs4_recoverable_stateid(&state->stateid);
 485
 486         switch(errorcode) {
 487                 case 0:
 488                         return 0;
 489                 case -NFS4ERR_BADHANDLE:
 490                 case -ESTALE:
 491                         if (inode != NULL && S_ISREG(inode->i_mode))
 492                                 pnfs_destroy_layout(NFS_I(inode));
 493                         break;
 494                 case -NFS4ERR_DELEG_REVOKED:
 495                 case -NFS4ERR_ADMIN_REVOKED:
 496                 case -NFS4ERR_EXPIRED:
 497                 case -NFS4ERR_BAD_STATEID:
 498                 case -NFS4ERR_PARTNER_NO_AUTH:
 499                         if (inode != NULL && stateid != NULL) {
 500                                 nfs_inode_find_state_and_recover(inode,
 501                                                 stateid);
 502                                 goto wait_on_recovery;
 503                         }
 504                         fallthrough;
 505                 case -NFS4ERR_OPENMODE:
 506                         if (inode) {
 507                                 int err;
 508
 509                                 err = nfs_async_inode_return_delegation(inode,
 510                                                 stateid);
 511                                 if (err == 0)
 512                                         goto wait_on_recovery;
 513                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 514                                         exception->retry = 1;
 515                                         break;
 516                                 }
 517                         }
 518                         if (state == NULL)
 519                                 break;
 520                         ret = nfs4_schedule_stateid_recovery(server, state);
 521                         if (ret < 0)
 522                                 break;
 523                         goto wait_on_recovery;
 524                 case -NFS4ERR_STALE_STATEID:
 525                 case -NFS4ERR_STALE_CLIENTID:
 526                         nfs4_schedule_lease_recovery(clp);
 527                         goto wait_on_recovery;
 528                 case -NFS4ERR_MOVED:
 529                         ret = nfs4_schedule_migration_recovery(server);
 530                         if (ret < 0)
 531                                 break;
 532                         goto wait_on_recovery;
 533                 case -NFS4ERR_LEASE_MOVED:
 534                         nfs4_schedule_lease_moved_recovery(clp);
 535                         goto wait_on_recovery;
 536 #if defined(CONFIG_NFS_V4_1)
 537                 case -NFS4ERR_BADSESSION:
 538                 case -NFS4ERR_BADSLOT:
 539                 case -NFS4ERR_BAD_HIGH_SLOT:
 540                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 541                 case -NFS4ERR_DEADSESSION:
 542                 case -NFS4ERR_SEQ_FALSE_RETRY:
 543                 case -NFS4ERR_SEQ_MISORDERED:
 544                         /* Handled in nfs41_sequence_process() */
 545                         goto wait_on_recovery;
 546 #endif /* defined(CONFIG_NFS_V4_1) */
 547                 case -NFS4ERR_FILE_OPEN:
 548                         if (exception->timeout > HZ) {
 549                                 /* We have retried a decent amount, time to
 550                                  * fail
 551                                  */
 552                                 ret = -EBUSY;
 553                                 break;
 554                         }
 555                         fallthrough;
 556                 case -NFS4ERR_DELAY:
 557                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 558                         fallthrough;
 559                 case -NFS4ERR_GRACE:
 560                 case -NFS4ERR_LAYOUTTRYLATER:
 561                 case -NFS4ERR_RECALLCONFLICT:
 562                 case -NFS4ERR_RETURNCONFLICT:
 563                         exception->delay = 1;
 564                         return 0;
 565
 566                 case -NFS4ERR_RETRY_UNCACHED_REP:
 567                 case -NFS4ERR_OLD_STATEID:
 568                         exception->retry = 1;
 569                         break;
 570                 case -NFS4ERR_BADOWNER:
 571                         /* The following works around a Linux server bug! */
 572                 case -NFS4ERR_BADNAME:
 573                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 574                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 575                                 exception->retry = 1;
 576                                 printk(KERN_WARNING "NFS: v4 server %s "
 577                                                 "does not accept raw "
 578                                                 "uid/gids. "
 579                                                 "Reenabling the idmapper.\n",
 580                                                 server->nfs_client->cl_hostname);
 581                         }
 582         }
 583         /* We failed to handle the error */
 584         return nfs4_map_errors(ret);
 585 wait_on_recovery:
 586         exception->recovering = 1;
 587         return 0;
 588 }
 589
 590 /* This is the error handling routine for processes that are allowed
 591  * to sleep.
 592  */
 593 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 594 {
 595         struct nfs_client *clp = server->nfs_client;
 596         int ret;
 597
 598         ret = nfs4_do_handle_exception(server, errorcode, exception);
 599         if (exception->delay) {
 600                 ret = nfs4_delay(&exception->timeout,
 601                                 exception->interruptible);
 602                 goto out_retry;
 603         }
 604         if (exception->recovering) {
 605                 if (exception->task_is_privileged)
 606                         return -EDEADLOCK;
 607                 ret = nfs4_wait_clnt_recover(clp);
 608                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 609                         return -EIO;
 610                 goto out_retry;
 611         }
 612         return ret;
 613 out_retry:
 614         if (ret == 0)
 615                 exception->retry = 1;
 616         return ret;
 617 }
 618
 619 static int
 620 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 621                 int errorcode, struct nfs4_exception *exception)
 622 {
 623         struct nfs_client *clp = server->nfs_client;
 624         int ret;
 625
 626         ret = nfs4_do_handle_exception(server, errorcode, exception);
 627         if (exception->delay) {
 628                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 629                 goto out_retry;
 630         }
 631         if (exception->recovering) {
 632                 if (exception->task_is_privileged)
 633                         return -EDEADLOCK;
 634                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 635                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 636                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 637                 goto out_retry;
 638         }
 639         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 640                 ret = -EIO;
 641         return ret;
 642 out_retry:
 643         if (ret == 0) {
 644                 exception->retry = 1;
 645                 /*
 646                  * For NFS4ERR_MOVED, the client transport will need to
 647                  * be recomputed after migration recovery has completed.
 648                  */
 649                 if (errorcode == -NFS4ERR_MOVED)
 650                         rpc_task_release_transport(task);
 651         }
 652         return ret;
 653 }
 654
 655 int
 656 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 657                         struct nfs4_state *state, long *timeout)
 658 {
 659         struct nfs4_exception exception = {
 660                 .state = state,
 661         };
 662
 663         if (task->tk_status >= 0)
 664                 return 0;
 665         if (timeout)
 666                 exception.timeout = *timeout;
 667         task->tk_status = nfs4_async_handle_exception(task, server,
 668                         task->tk_status,
 669                         &exception);
 670         if (exception.delay && timeout)
 671                 *timeout = exception.timeout;
 672         if (exception.retry)
 673                 return -EAGAIN;
 674         return 0;
 675 }
 676
 677 /*
 678  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 679  * or 'false' otherwise.
 680  */
 681 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 682 {
 683         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 684         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 685 }
 686
 687 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 688 {
 689         spin_lock(&clp->cl_lock);
 690         if (time_before(clp->cl_last_renewal,timestamp))
 691                 clp->cl_last_renewal = timestamp;
 692         spin_unlock(&clp->cl_lock);
 693 }
 694
 695 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 696 {
 697         struct nfs_client *clp = server->nfs_client;
 698
 699         if (!nfs4_has_session(clp))
 700                 do_renew_lease(clp, timestamp);
 701 }
 702
 703 struct nfs4_call_sync_data {
 704         const struct nfs_server *seq_server;
 705         struct nfs4_sequence_args *seq_args;
 706         struct nfs4_sequence_res *seq_res;
 707 };
 708
 709 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 710                         struct nfs4_sequence_res *res, int cache_reply,
 711                         int privileged)
 712 {
 713         args->sa_slot = NULL;
 714         args->sa_cache_this = cache_reply;
 715         args->sa_privileged = privileged;
 716
 717         res->sr_slot = NULL;
 718 }
 719
 720 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 721 {
 722         struct nfs4_slot *slot = res->sr_slot;
 723         struct nfs4_slot_table *tbl;
 724
 725         tbl = slot->table;
 726         spin_lock(&tbl->slot_tbl_lock);
 727         if (!nfs41_wake_and_assign_slot(tbl, slot))
 728                 nfs4_free_slot(tbl, slot);
 729         spin_unlock(&tbl->slot_tbl_lock);
 730
 731         res->sr_slot = NULL;
 732 }
 733
 734 static int nfs40_sequence_done(struct rpc_task *task,
 735                                struct nfs4_sequence_res *res)
 736 {
 737         if (res->sr_slot != NULL)
 738                 nfs40_sequence_free_slot(res);
 739         return 1;
 740 }
 741
 742 #if defined(CONFIG_NFS_V4_1)
 743
 744 static void nfs41_release_slot(struct nfs4_slot *slot)
 745 {
 746         struct nfs4_session *session;
 747         struct nfs4_slot_table *tbl;
 748         bool send_new_highest_used_slotid = false;
 749
 750         if (!slot)
 751                 return;
 752         tbl = slot->table;
 753         session = tbl->session;
 754
 755         /* Bump the slot sequence number */
 756         if (slot->seq_done)
 757                 slot->seq_nr++;
 758         slot->seq_done = 0;
 759
 760         spin_lock(&tbl->slot_tbl_lock);
 761         /* Be nice to the server: try to ensure that the last transmitted
 762          * value for highest_user_slotid <= target_highest_slotid
 763          */
 764         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 765                 send_new_highest_used_slotid = true;
 766
 767         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 768                 send_new_highest_used_slotid = false;
 769                 goto out_unlock;
 770         }
 771         nfs4_free_slot(tbl, slot);
 772
 773         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 774                 send_new_highest_used_slotid = false;
 775 out_unlock:
 776         spin_unlock(&tbl->slot_tbl_lock);
 777         if (send_new_highest_used_slotid)
 778                 nfs41_notify_server(session->clp);
 779         if (waitqueue_active(&tbl->slot_waitq))
 780                 wake_up_all(&tbl->slot_waitq);
 781 }
 782
 783 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 784 {
 785         nfs41_release_slot(res->sr_slot);
 786         res->sr_slot = NULL;
 787 }
 788
 789 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 790                 u32 seqnr)
 791 {
 792         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 793                 slot->seq_nr_highest_sent = seqnr;
 794 }
 795 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 796 {
 797         nfs4_slot_sequence_record_sent(slot, seqnr);
 798         slot->seq_nr_last_acked = seqnr;
 799 }
 800
 801 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 802                                 struct nfs4_slot *slot)
 803 {
 804         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 805         if (!IS_ERR(task))
 806                 rpc_put_task_async(task);
 807 }
 808
 809 static int nfs41_sequence_process(struct rpc_task *task,
 810                 struct nfs4_sequence_res *res)
 811 {
 812         struct nfs4_session *session;
 813         struct nfs4_slot *slot = res->sr_slot;
 814         struct nfs_client *clp;
 815         int status;
 816         int ret = 1;
 817
 818         if (slot == NULL)
 819                 goto out_noaction;
 820         /* don't increment the sequence number if the task wasn't sent */
 821         if (!RPC_WAS_SENT(task) || slot->seq_done)
 822                 goto out;
 823
 824         session = slot->table->session;
 825         clp = session->clp;
 826
 827         trace_nfs4_sequence_done(session, res);
 828
 829         status = res->sr_status;
 830         if (task->tk_status == -NFS4ERR_DEADSESSION)
 831                 status = -NFS4ERR_DEADSESSION;
 832
 833         /* Check the SEQUENCE operation status */
 834         switch (status) {
 835         case 0:
 836                 /* Mark this sequence number as having been acked */
 837                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 838                 /* Update the slot's sequence and clientid lease timer */
 839                 slot->seq_done = 1;
 840                 do_renew_lease(clp, res->sr_timestamp);
 841                 /* Check sequence flags */
 842                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 843                                 !!slot->privileged);
 844                 nfs41_update_target_slotid(slot->table, slot, res);
 845                 break;
 846         case 1:
 847                 /*
 848                  * sr_status remains 1 if an RPC level error occurred.
 849                  * The server may or may not have processed the sequence
 850                  * operation..
 851                  */
 852                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 853                 slot->seq_done = 1;
 854                 goto out;
 855         case -NFS4ERR_DELAY:
 856                 /* The server detected a resend of the RPC call and
 857                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 858                  * of RFC5661.
 859                  */
 860                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 861                         __func__,
 862                         slot->slot_nr,
 863                         slot->seq_nr);
 864                 goto out_retry;
 865         case -NFS4ERR_RETRY_UNCACHED_REP:
 866         case -NFS4ERR_SEQ_FALSE_RETRY:
 867                 /*
 868                  * The server thinks we tried to replay a request.
 869                  * Retry the call after bumping the sequence ID.
 870                  */
 871                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 872                 goto retry_new_seq;
 873         case -NFS4ERR_BADSLOT:
 874                 /*
 875                  * The slot id we used was probably retired. Try again
 876                  * using a different slot id.
 877                  */
 878                 if (slot->slot_nr < slot->table->target_highest_slotid)
 879                         goto session_recover;
 880                 goto retry_nowait;
 881         case -NFS4ERR_SEQ_MISORDERED:
 882                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 883                 /*
 884                  * Were one or more calls using this slot interrupted?
 885                  * If the server never received the request, then our
 886                  * transmitted slot sequence number may be too high. However,
 887                  * if the server did receive the request then it might
 888                  * accidentally give us a reply with a mismatched operation.
 889                  * We can sort this out by sending a lone sequence operation
 890                  * to the server on the same slot.
 891                  */
 892                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 893                         slot->seq_nr--;
 894                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 895                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 896                                 res->sr_slot = NULL;
 897                         }
 898                         goto retry_nowait;
 899                 }
 900                 /*
 901                  * RFC5661:
 902                  * A retry might be sent while the original request is
 903                  * still in progress on the replier. The replier SHOULD
 904                  * deal with the issue by returning NFS4ERR_DELAY as the
 905                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 906                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 907                  *
 908                  * Restart the search after a delay.
 909                  */
 910                 slot->seq_nr = slot->seq_nr_highest_sent;
 911                 goto out_retry;
 912         case -NFS4ERR_BADSESSION:
 913         case -NFS4ERR_DEADSESSION:
 914         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 915                 goto session_recover;
 916         default:
 917                 /* Just update the slot sequence no. */
 918                 slot->seq_done = 1;
 919         }
 920 out:
 921         /* The session may be reset by one of the error handlers. */
 922         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 923 out_noaction:
 924         return ret;
 925 session_recover:
 926         set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
 927         nfs4_schedule_session_recovery(session, status);
 928         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 929         nfs41_sequence_free_slot(res);
 930         goto out;
 931 retry_new_seq:
 932         ++slot->seq_nr;
 933 retry_nowait:
 934         if (rpc_restart_call_prepare(task)) {
 935                 nfs41_sequence_free_slot(res);
 936                 task->tk_status = 0;
 937                 ret = 0;
 938         }
 939         goto out;
 940 out_retry:
 941         if (!rpc_restart_call(task))
 942                 goto out;
 943         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 944         return 0;
 945 }
 946
 947 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 948 {
 949         if (!nfs41_sequence_process(task, res))
 950                 return 0;
 951         if (res->sr_slot != NULL)
 952                 nfs41_sequence_free_slot(res);
 953         return 1;
 954
 955 }
 956 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 957
 958 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 959 {
 960         if (res->sr_slot == NULL)
 961                 return 1;
 962         if (res->sr_slot->table->session != NULL)
 963                 return nfs41_sequence_process(task, res);
 964         return nfs40_sequence_done(task, res);
 965 }
 966
 967 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 968 {
 969         if (res->sr_slot != NULL) {
 970                 if (res->sr_slot->table->session != NULL)
 971                         nfs41_sequence_free_slot(res);
 972                 else
 973                         nfs40_sequence_free_slot(res);
 974         }
 975 }
 976
 977 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 978 {
 979         if (res->sr_slot == NULL)
 980                 return 1;
 981         if (!res->sr_slot->table->session)
 982                 return nfs40_sequence_done(task, res);
 983         return nfs41_sequence_done(task, res);
 984 }
 985 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 986
 987 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 988 {
 989         struct nfs4_call_sync_data *data = calldata;
 990
 991         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 992
 993         nfs4_setup_sequence(data->seq_server->nfs_client,
 994                             data->seq_args, data->seq_res, task);
 995 }
 996
 997 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 998 {
 999         struct nfs4_call_sync_data *data = calldata;
1000
1001         nfs41_sequence_done(task, data->seq_res);
1002 }
1003
1004 static const struct rpc_call_ops nfs41_call_sync_ops = {
1005         .rpc_call_prepare = nfs41_call_sync_prepare,
1006         .rpc_call_done = nfs41_call_sync_done,
1007 };
1008
1009 #else   /* !CONFIG_NFS_V4_1 */
1010
1011 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1012 {
1013         return nfs40_sequence_done(task, res);
1014 }
1015
1016 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1017 {
1018         if (res->sr_slot != NULL)
1019                 nfs40_sequence_free_slot(res);
1020 }
1021
1022 int nfs4_sequence_done(struct rpc_task *task,
1023                        struct nfs4_sequence_res *res)
1024 {
1025         return nfs40_sequence_done(task, res);
1026 }
1027 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1028
1029 #endif  /* !CONFIG_NFS_V4_1 */
1030
1031 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1032 {
1033         res->sr_timestamp = jiffies;
1034         res->sr_status_flags = 0;
1035         res->sr_status = 1;
1036 }
1037
1038 static
1039 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1040                 struct nfs4_sequence_res *res,
1041                 struct nfs4_slot *slot)
1042 {
1043         if (!slot)
1044                 return;
1045         slot->privileged = args->sa_privileged ? 1 : 0;
1046         args->sa_slot = slot;
1047
1048         res->sr_slot = slot;
1049 }
1050
1051 int nfs4_setup_sequence(struct nfs_client *client,
1052                         struct nfs4_sequence_args *args,
1053                         struct nfs4_sequence_res *res,
1054                         struct rpc_task *task)
1055 {
1056         struct nfs4_session *session = nfs4_get_session(client);
1057         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1058         struct nfs4_slot *slot;
1059
1060         /* slot already allocated? */
1061         if (res->sr_slot != NULL)
1062                 goto out_start;
1063
1064         if (session)
1065                 tbl = &session->fc_slot_table;
1066
1067         spin_lock(&tbl->slot_tbl_lock);
1068         /* The state manager will wait until the slot table is empty */
1069         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1070                 goto out_sleep;
1071
1072         slot = nfs4_alloc_slot(tbl);
1073         if (IS_ERR(slot)) {
1074                 if (slot == ERR_PTR(-ENOMEM))
1075                         goto out_sleep_timeout;
1076                 goto out_sleep;
1077         }
1078         spin_unlock(&tbl->slot_tbl_lock);
1079
1080         nfs4_sequence_attach_slot(args, res, slot);
1081
1082         trace_nfs4_setup_sequence(session, args);
1083 out_start:
1084         nfs41_sequence_res_init(res);
1085         rpc_call_start(task);
1086         return 0;
1087 out_sleep_timeout:
1088         /* Try again in 1/4 second */
1089         if (args->sa_privileged)
1090                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1091                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1092         else
1093                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1094                                 NULL, jiffies + (HZ >> 2));
1095         spin_unlock(&tbl->slot_tbl_lock);
1096         return -EAGAIN;
1097 out_sleep:
1098         if (args->sa_privileged)
1099                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1100                                 RPC_PRIORITY_PRIVILEGED);
1101         else
1102                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1103         spin_unlock(&tbl->slot_tbl_lock);
1104         return -EAGAIN;
1105 }
1106 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1107
1108 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1109 {
1110         struct nfs4_call_sync_data *data = calldata;
1111         nfs4_setup_sequence(data->seq_server->nfs_client,
1112                                 data->seq_args, data->seq_res, task);
1113 }
1114
1115 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1116 {
1117         struct nfs4_call_sync_data *data = calldata;
1118         nfs4_sequence_done(task, data->seq_res);
1119 }
1120
1121 static const struct rpc_call_ops nfs40_call_sync_ops = {
1122         .rpc_call_prepare = nfs40_call_sync_prepare,
1123         .rpc_call_done = nfs40_call_sync_done,
1124 };
1125
1126 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1127 {
1128         int ret;
1129         struct rpc_task *task;
1130
1131         task = rpc_run_task(task_setup);
1132         if (IS_ERR(task))
1133                 return PTR_ERR(task);
1134
1135         ret = task->tk_status;
1136         rpc_put_task(task);
1137         return ret;
1138 }
1139
1140 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1141                              struct nfs_server *server,
1142                              struct rpc_message *msg,
1143                              struct nfs4_sequence_args *args,
1144                              struct nfs4_sequence_res *res,
1145                              unsigned short task_flags)
1146 {
1147         struct nfs_client *clp = server->nfs_client;
1148         struct nfs4_call_sync_data data = {
1149                 .seq_server = server,
1150                 .seq_args = args,
1151                 .seq_res = res,
1152         };
1153         struct rpc_task_setup task_setup = {
1154                 .rpc_client = clnt,
1155                 .rpc_message = msg,
1156                 .callback_ops = clp->cl_mvops->call_sync_ops,
1157                 .callback_data = &data,
1158                 .flags = task_flags,
1159         };
1160
1161         return nfs4_call_sync_custom(&task_setup);
1162 }
1163
1164 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1165                                    struct nfs_server *server,
1166                                    struct rpc_message *msg,
1167                                    struct nfs4_sequence_args *args,
1168                                    struct nfs4_sequence_res *res)
1169 {
1170         unsigned short task_flags = 0;
1171
1172         if (server->caps & NFS_CAP_MOVEABLE)
1173                 task_flags = RPC_TASK_MOVEABLE;
1174         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1175 }
1176
1177
1178 int nfs4_call_sync(struct rpc_clnt *clnt,
1179                    struct nfs_server *server,
1180                    struct rpc_message *msg,
1181                    struct nfs4_sequence_args *args,
1182                    struct nfs4_sequence_res *res,
1183                    int cache_reply)
1184 {
1185         nfs4_init_sequence(args, res, cache_reply, 0);
1186         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1187 }
1188
1189 static void
1190 nfs4_inc_nlink_locked(struct inode *inode)
1191 {
1192         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1193                                              NFS_INO_INVALID_CTIME |
1194                                              NFS_INO_INVALID_NLINK);
1195         inc_nlink(inode);
1196 }
1197
1198 static void
1199 nfs4_inc_nlink(struct inode *inode)
1200 {
1201         spin_lock(&inode->i_lock);
1202         nfs4_inc_nlink_locked(inode);
1203         spin_unlock(&inode->i_lock);
1204 }
1205
1206 static void
1207 nfs4_dec_nlink_locked(struct inode *inode)
1208 {
1209         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1210                                              NFS_INO_INVALID_CTIME |
1211                                              NFS_INO_INVALID_NLINK);
1212         drop_nlink(inode);
1213 }
1214
1215 static void
1216 nfs4_update_changeattr_locked(struct inode *inode,
1217                 struct nfs4_change_info *cinfo,
1218                 unsigned long timestamp, unsigned long cache_validity)
1219 {
1220         struct nfs_inode *nfsi = NFS_I(inode);
1221         u64 change_attr = inode_peek_iversion_raw(inode);
1222
1223         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1224         if (S_ISDIR(inode->i_mode))
1225                 cache_validity |= NFS_INO_INVALID_DATA;
1226
1227         switch (NFS_SERVER(inode)->change_attr_type) {
1228         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1229                 if (cinfo->after == change_attr)
1230                         goto out;
1231                 break;
1232         default:
1233                 if ((s64)(change_attr - cinfo->after) >= 0)
1234                         goto out;
1235         }
1236
1237         inode_set_iversion_raw(inode, cinfo->after);
1238         if (!cinfo->atomic || cinfo->before != change_attr) {
1239                 if (S_ISDIR(inode->i_mode))
1240                         nfs_force_lookup_revalidate(inode);
1241
1242                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1243                         cache_validity |=
1244                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1245                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1246                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1247                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1248                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1249         }
1250         nfsi->attrtimeo_timestamp = jiffies;
1251         nfsi->read_cache_jiffies = timestamp;
1252         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1253         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1254 out:
1255         nfs_set_cache_invalid(inode, cache_validity);
1256 }
1257
1258 void
1259 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1260                 unsigned long timestamp, unsigned long cache_validity)
1261 {
1262         spin_lock(&dir->i_lock);
1263         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1264         spin_unlock(&dir->i_lock);
1265 }
1266
1267 struct nfs4_open_createattrs {
1268         struct nfs4_label *label;
1269         struct iattr *sattr;
1270         const __u32 verf[2];
1271 };
1272
1273 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1274                 int err, struct nfs4_exception *exception)
1275 {
1276         if (err != -EINVAL)
1277                 return false;
1278         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1279                 return false;
1280         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1281         exception->retry = 1;
1282         return true;
1283 }
1284
1285 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1286 {
1287          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1288 }
1289
1290 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1291 {
1292         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1293
1294         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1295 }
1296
1297 static u32
1298 nfs4_map_atomic_open_share(struct nfs_server *server,
1299                 fmode_t fmode, int openflags)
1300 {
1301         u32 res = 0;
1302
1303         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1304         case FMODE_READ:
1305                 res = NFS4_SHARE_ACCESS_READ;
1306                 break;
1307         case FMODE_WRITE:
1308                 res = NFS4_SHARE_ACCESS_WRITE;
1309                 break;
1310         case FMODE_READ|FMODE_WRITE:
1311                 res = NFS4_SHARE_ACCESS_BOTH;
1312         }
1313         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1314                 goto out;
1315         /* Want no delegation if we're using O_DIRECT */
1316         if (openflags & O_DIRECT)
1317                 res |= NFS4_SHARE_WANT_NO_DELEG;
1318 out:
1319         return res;
1320 }
1321
1322 static enum open_claim_type4
1323 nfs4_map_atomic_open_claim(struct nfs_server *server,
1324                 enum open_claim_type4 claim)
1325 {
1326         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1327                 return claim;
1328         switch (claim) {
1329         default:
1330                 return claim;
1331         case NFS4_OPEN_CLAIM_FH:
1332                 return NFS4_OPEN_CLAIM_NULL;
1333         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1334                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1335         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1336                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1337         }
1338 }
1339
1340 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1341 {
1342         p->o_res.f_attr = &p->f_attr;
1343         p->o_res.seqid = p->o_arg.seqid;
1344         p->c_res.seqid = p->c_arg.seqid;
1345         p->o_res.server = p->o_arg.server;
1346         p->o_res.access_request = p->o_arg.access;
1347         nfs_fattr_init(&p->f_attr);
1348         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1349 }
1350
1351 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1352                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1353                 const struct nfs4_open_createattrs *c,
1354                 enum open_claim_type4 claim,
1355                 gfp_t gfp_mask)
1356 {
1357         struct dentry *parent = dget_parent(dentry);
1358         struct inode *dir = d_inode(parent);
1359         struct nfs_server *server = NFS_SERVER(dir);
1360         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1361         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1362         struct nfs4_opendata *p;
1363
1364         p = kzalloc(sizeof(*p), gfp_mask);
1365         if (p == NULL)
1366                 goto err;
1367
1368         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1369         if (IS_ERR(p->f_attr.label))
1370                 goto err_free_p;
1371
1372         p->a_label = nfs4_label_alloc(server, gfp_mask);
1373         if (IS_ERR(p->a_label))
1374                 goto err_free_f;
1375
1376         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1377         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1378         if (IS_ERR(p->o_arg.seqid))
1379                 goto err_free_label;
1380         nfs_sb_active(dentry->d_sb);
1381         p->dentry = dget(dentry);
1382         p->dir = parent;
1383         p->owner = sp;
1384         atomic_inc(&sp->so_count);
1385         p->o_arg.open_flags = flags;
1386         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1387         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1388         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1389                         fmode, flags);
1390         if (flags & O_CREAT) {
1391                 p->o_arg.umask = current_umask();
1392                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1393                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1394                         p->o_arg.u.attrs = &p->attrs;
1395                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1396
1397                         memcpy(p->o_arg.u.verifier.data, c->verf,
1398                                         sizeof(p->o_arg.u.verifier.data));
1399                 }
1400         }
1401         /* ask server to check for all possible rights as results
1402          * are cached */
1403         switch (p->o_arg.claim) {
1404         default:
1405                 break;
1406         case NFS4_OPEN_CLAIM_NULL:
1407         case NFS4_OPEN_CLAIM_FH:
1408                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1409                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1410                                   NFS4_ACCESS_EXECUTE |
1411                                   nfs_access_xattr_mask(server);
1412         }
1413         p->o_arg.clientid = server->nfs_client->cl_clientid;
1414         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1415         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1416         p->o_arg.name = &dentry->d_name;
1417         p->o_arg.server = server;
1418         p->o_arg.bitmask = nfs4_bitmask(server, label);
1419         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1420         switch (p->o_arg.claim) {
1421         case NFS4_OPEN_CLAIM_NULL:
1422         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1423         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1424                 p->o_arg.fh = NFS_FH(dir);
1425                 break;
1426         case NFS4_OPEN_CLAIM_PREVIOUS:
1427         case NFS4_OPEN_CLAIM_FH:
1428         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1429         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1430                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1431         }
1432         p->c_arg.fh = &p->o_res.fh;
1433         p->c_arg.stateid = &p->o_res.stateid;
1434         p->c_arg.seqid = p->o_arg.seqid;
1435         nfs4_init_opendata_res(p);
1436         kref_init(&p->kref);
1437         return p;
1438
1439 err_free_label:
1440         nfs4_label_free(p->a_label);
1441 err_free_f:
1442         nfs4_label_free(p->f_attr.label);
1443 err_free_p:
1444         kfree(p);
1445 err:
1446         dput(parent);
1447         return NULL;
1448 }
1449
1450 static void nfs4_opendata_free(struct kref *kref)
1451 {
1452         struct nfs4_opendata *p = container_of(kref,
1453                         struct nfs4_opendata, kref);
1454         struct super_block *sb = p->dentry->d_sb;
1455
1456         nfs4_lgopen_release(p->lgp);
1457         nfs_free_seqid(p->o_arg.seqid);
1458         nfs4_sequence_free_slot(&p->o_res.seq_res);
1459         if (p->state != NULL)
1460                 nfs4_put_open_state(p->state);
1461         nfs4_put_state_owner(p->owner);
1462
1463         nfs4_label_free(p->a_label);
1464         nfs4_label_free(p->f_attr.label);
1465
1466         dput(p->dir);
1467         dput(p->dentry);
1468         nfs_sb_deactive(sb);
1469         nfs_fattr_free_names(&p->f_attr);
1470         kfree(p->f_attr.mdsthreshold);
1471         kfree(p);
1472 }
1473
1474 static void nfs4_opendata_put(struct nfs4_opendata *p)
1475 {
1476         if (p != NULL)
1477                 kref_put(&p->kref, nfs4_opendata_free);
1478 }
1479
1480 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1481                 fmode_t fmode)
1482 {
1483         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1484         case FMODE_READ|FMODE_WRITE:
1485                 return state->n_rdwr != 0;
1486         case FMODE_WRITE:
1487                 return state->n_wronly != 0;
1488         case FMODE_READ:
1489                 return state->n_rdonly != 0;
1490         }
1491         WARN_ON_ONCE(1);
1492         return false;
1493 }
1494
1495 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1496                 int open_mode, enum open_claim_type4 claim)
1497 {
1498         int ret = 0;
1499
1500         if (open_mode & (O_EXCL|O_TRUNC))
1501                 goto out;
1502         switch (claim) {
1503         case NFS4_OPEN_CLAIM_NULL:
1504         case NFS4_OPEN_CLAIM_FH:
1505                 goto out;
1506         default:
1507                 break;
1508         }
1509         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1510                 case FMODE_READ:
1511                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1512                                 && state->n_rdonly != 0;
1513                         break;
1514                 case FMODE_WRITE:
1515                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1516                                 && state->n_wronly != 0;
1517                         break;
1518                 case FMODE_READ|FMODE_WRITE:
1519                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1520                                 && state->n_rdwr != 0;
1521         }
1522 out:
1523         return ret;
1524 }
1525
1526 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1527                 enum open_claim_type4 claim)
1528 {
1529         if (delegation == NULL)
1530                 return 0;
1531         if ((delegation->type & fmode) != fmode)
1532                 return 0;
1533         switch (claim) {
1534         case NFS4_OPEN_CLAIM_NULL:
1535         case NFS4_OPEN_CLAIM_FH:
1536                 break;
1537         case NFS4_OPEN_CLAIM_PREVIOUS:
1538                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1539                         break;
1540                 fallthrough;
1541         default:
1542                 return 0;
1543         }
1544         nfs_mark_delegation_referenced(delegation);
1545         return 1;
1546 }
1547
1548 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1549 {
1550         switch (fmode) {
1551                 case FMODE_WRITE:
1552                         state->n_wronly++;
1553                         break;
1554                 case FMODE_READ:
1555                         state->n_rdonly++;
1556                         break;
1557                 case FMODE_READ|FMODE_WRITE:
1558                         state->n_rdwr++;
1559         }
1560         nfs4_state_set_mode_locked(state, state->state | fmode);
1561 }
1562
1563 #ifdef CONFIG_NFS_V4_1
1564 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1565 {
1566         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1567                 return true;
1568         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1569                 return true;
1570         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1571                 return true;
1572         return false;
1573 }
1574 #endif /* CONFIG_NFS_V4_1 */
1575
1576 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1577 {
1578         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1579                 wake_up_all(&state->waitq);
1580 }
1581
1582 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1583 {
1584         struct nfs_client *clp = state->owner->so_server->nfs_client;
1585         bool need_recover = false;
1586
1587         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1588                 need_recover = true;
1589         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1590                 need_recover = true;
1591         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1592                 need_recover = true;
1593         if (need_recover)
1594                 nfs4_state_mark_reclaim_nograce(clp, state);
1595 }
1596
1597 /*
1598  * Check for whether or not the caller may update the open stateid
1599  * to the value passed in by stateid.
1600  *
1601  * Note: This function relies heavily on the server implementing
1602  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1603  * correctly.
1604  * i.e. The stateid seqids have to be initialised to 1, and
1605  * are then incremented on every state transition.
1606  */
1607 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1608                 const nfs4_stateid *stateid)
1609 {
1610         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1611                 /* The common case - we're updating to a new sequence number */
1612                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1613                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1614                                 return true;
1615                         return false;
1616                 }
1617                 /* The server returned a new stateid */
1618         }
1619         /* This is the first OPEN in this generation */
1620         if (stateid->seqid == cpu_to_be32(1))
1621                 return true;
1622         return false;
1623 }
1624
1625 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1626 {
1627         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1628                 return;
1629         if (state->n_wronly)
1630                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1631         if (state->n_rdonly)
1632                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1633         if (state->n_rdwr)
1634                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1635         set_bit(NFS_OPEN_STATE, &state->flags);
1636 }
1637
1638 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1639                 nfs4_stateid *stateid, fmode_t fmode)
1640 {
1641         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1642         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1643         case FMODE_WRITE:
1644                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1645                 break;
1646         case FMODE_READ:
1647                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1648                 break;
1649         case 0:
1650                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1651                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1652                 clear_bit(NFS_OPEN_STATE, &state->flags);
1653         }
1654         if (stateid == NULL)
1655                 return;
1656         /* Handle OPEN+OPEN_DOWNGRADE races */
1657         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1658             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1659                 nfs_resync_open_stateid_locked(state);
1660                 goto out;
1661         }
1662         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1663                 nfs4_stateid_copy(&state->stateid, stateid);
1664         nfs4_stateid_copy(&state->open_stateid, stateid);
1665         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1666 out:
1667         nfs_state_log_update_open_stateid(state);
1668 }
1669
1670 static void nfs_clear_open_stateid(struct nfs4_state *state,
1671         nfs4_stateid *arg_stateid,
1672         nfs4_stateid *stateid, fmode_t fmode)
1673 {
1674         write_seqlock(&state->seqlock);
1675         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1676         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1677                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1678         write_sequnlock(&state->seqlock);
1679         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1680                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1681 }
1682
1683 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1684                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1685         __must_hold(&state->owner->so_lock)
1686         __must_hold(&state->seqlock)
1687         __must_hold(RCU)
1688
1689 {
1690         DEFINE_WAIT(wait);
1691         int status = 0;
1692         for (;;) {
1693
1694                 if (nfs_stateid_is_sequential(state, stateid))
1695                         break;
1696
1697                 if (status)
1698                         break;
1699                 /* Rely on seqids for serialisation with NFSv4.0 */
1700                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1701                         break;
1702
1703                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1704                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1705                 /*
1706                  * Ensure we process the state changes in the same order
1707                  * in which the server processed them by delaying the
1708                  * update of the stateid until we are in sequence.
1709                  */
1710                 write_sequnlock(&state->seqlock);
1711                 spin_unlock(&state->owner->so_lock);
1712                 rcu_read_unlock();
1713                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1714
1715                 if (!fatal_signal_pending(current)) {
1716                         if (schedule_timeout(5*HZ) == 0)
1717                                 status = -EAGAIN;
1718                         else
1719                                 status = 0;
1720                 } else
1721                         status = -EINTR;
1722                 finish_wait(&state->waitq, &wait);
1723                 rcu_read_lock();
1724                 spin_lock(&state->owner->so_lock);
1725                 write_seqlock(&state->seqlock);
1726         }
1727
1728         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1729             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1730                 nfs4_stateid_copy(freeme, &state->open_stateid);
1731                 nfs_test_and_clear_all_open_stateid(state);
1732         }
1733
1734         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1735                 nfs4_stateid_copy(&state->stateid, stateid);
1736         nfs4_stateid_copy(&state->open_stateid, stateid);
1737         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1738         nfs_state_log_update_open_stateid(state);
1739 }
1740
1741 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1742                 const nfs4_stateid *open_stateid,
1743                 fmode_t fmode,
1744                 nfs4_stateid *freeme)
1745 {
1746         /*
1747          * Protect the call to nfs4_state_set_mode_locked and
1748          * serialise the stateid update
1749          */
1750         write_seqlock(&state->seqlock);
1751         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1752         switch (fmode) {
1753         case FMODE_READ:
1754                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1755                 break;
1756         case FMODE_WRITE:
1757                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1758                 break;
1759         case FMODE_READ|FMODE_WRITE:
1760                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1761         }
1762         set_bit(NFS_OPEN_STATE, &state->flags);
1763         write_sequnlock(&state->seqlock);
1764 }
1765
1766 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1767 {
1768         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1769         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1770         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1771         clear_bit(NFS_OPEN_STATE, &state->flags);
1772 }
1773
1774 static void nfs_state_set_delegation(struct nfs4_state *state,
1775                 const nfs4_stateid *deleg_stateid,
1776                 fmode_t fmode)
1777 {
1778         /*
1779          * Protect the call to nfs4_state_set_mode_locked and
1780          * serialise the stateid update
1781          */
1782         write_seqlock(&state->seqlock);
1783         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1784         set_bit(NFS_DELEGATED_STATE, &state->flags);
1785         write_sequnlock(&state->seqlock);
1786 }
1787
1788 static void nfs_state_clear_delegation(struct nfs4_state *state)
1789 {
1790         write_seqlock(&state->seqlock);
1791         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1792         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1793         write_sequnlock(&state->seqlock);
1794 }
1795
1796 int update_open_stateid(struct nfs4_state *state,
1797                 const nfs4_stateid *open_stateid,
1798                 const nfs4_stateid *delegation,
1799                 fmode_t fmode)
1800 {
1801         struct nfs_server *server = NFS_SERVER(state->inode);
1802         struct nfs_client *clp = server->nfs_client;
1803         struct nfs_inode *nfsi = NFS_I(state->inode);
1804         struct nfs_delegation *deleg_cur;
1805         nfs4_stateid freeme = { };
1806         int ret = 0;
1807
1808         fmode &= (FMODE_READ|FMODE_WRITE);
1809
1810         rcu_read_lock();
1811         spin_lock(&state->owner->so_lock);
1812         if (open_stateid != NULL) {
1813                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1814                 ret = 1;
1815         }
1816
1817         deleg_cur = nfs4_get_valid_delegation(state->inode);
1818         if (deleg_cur == NULL)
1819                 goto no_delegation;
1820
1821         spin_lock(&deleg_cur->lock);
1822         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1823            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1824             (deleg_cur->type & fmode) != fmode)
1825                 goto no_delegation_unlock;
1826
1827         if (delegation == NULL)
1828                 delegation = &deleg_cur->stateid;
1829         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1830                 goto no_delegation_unlock;
1831
1832         nfs_mark_delegation_referenced(deleg_cur);
1833         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1834         ret = 1;
1835 no_delegation_unlock:
1836         spin_unlock(&deleg_cur->lock);
1837 no_delegation:
1838         if (ret)
1839                 update_open_stateflags(state, fmode);
1840         spin_unlock(&state->owner->so_lock);
1841         rcu_read_unlock();
1842
1843         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1844                 nfs4_schedule_state_manager(clp);
1845         if (freeme.type != 0)
1846                 nfs4_test_and_free_stateid(server, &freeme,
1847                                 state->owner->so_cred);
1848
1849         return ret;
1850 }
1851
1852 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1853                 const nfs4_stateid *stateid)
1854 {
1855         struct nfs4_state *state = lsp->ls_state;
1856         bool ret = false;
1857
1858         spin_lock(&state->state_lock);
1859         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1860                 goto out_noupdate;
1861         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1862                 goto out_noupdate;
1863         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1864         ret = true;
1865 out_noupdate:
1866         spin_unlock(&state->state_lock);
1867         return ret;
1868 }
1869
1870 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1871 {
1872         struct nfs_delegation *delegation;
1873
1874         fmode &= FMODE_READ|FMODE_WRITE;
1875         rcu_read_lock();
1876         delegation = nfs4_get_valid_delegation(inode);
1877         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1878                 rcu_read_unlock();
1879                 return;
1880         }
1881         rcu_read_unlock();
1882         nfs4_inode_return_delegation(inode);
1883 }
1884
1885 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1886 {
1887         struct nfs4_state *state = opendata->state;
1888         struct nfs_delegation *delegation;
1889         int open_mode = opendata->o_arg.open_flags;
1890         fmode_t fmode = opendata->o_arg.fmode;
1891         enum open_claim_type4 claim = opendata->o_arg.claim;
1892         nfs4_stateid stateid;
1893         int ret = -EAGAIN;
1894
1895         for (;;) {
1896                 spin_lock(&state->owner->so_lock);
1897                 if (can_open_cached(state, fmode, open_mode, claim)) {
1898                         update_open_stateflags(state, fmode);
1899                         spin_unlock(&state->owner->so_lock);
1900                         goto out_return_state;
1901                 }
1902                 spin_unlock(&state->owner->so_lock);
1903                 rcu_read_lock();
1904                 delegation = nfs4_get_valid_delegation(state->inode);
1905                 if (!can_open_delegated(delegation, fmode, claim)) {
1906                         rcu_read_unlock();
1907                         break;
1908                 }
1909                 /* Save the delegation */
1910                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1911                 rcu_read_unlock();
1912                 nfs_release_seqid(opendata->o_arg.seqid);
1913                 if (!opendata->is_recover) {
1914                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1915                         if (ret != 0)
1916                                 goto out;
1917                 }
1918                 ret = -EAGAIN;
1919
1920                 /* Try to update the stateid using the delegation */
1921                 if (update_open_stateid(state, NULL, &stateid, fmode))
1922                         goto out_return_state;
1923         }
1924 out:
1925         return ERR_PTR(ret);
1926 out_return_state:
1927         refcount_inc(&state->count);
1928         return state;
1929 }
1930
1931 static void
1932 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1933 {
1934         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1935         struct nfs_delegation *delegation;
1936         int delegation_flags = 0;
1937
1938         rcu_read_lock();
1939         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1940         if (delegation)
1941                 delegation_flags = delegation->flags;
1942         rcu_read_unlock();
1943         switch (data->o_arg.claim) {
1944         default:
1945                 break;
1946         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1947         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1948                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1949                                    "returning a delegation for "
1950                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1951                                    clp->cl_hostname);
1952                 return;
1953         }
1954         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1955                 nfs_inode_set_delegation(state->inode,
1956                                 data->owner->so_cred,
1957                                 data->o_res.delegation_type,
1958                                 &data->o_res.delegation,
1959                                 data->o_res.pagemod_limit);
1960         else
1961                 nfs_inode_reclaim_delegation(state->inode,
1962                                 data->owner->so_cred,
1963                                 data->o_res.delegation_type,
1964                                 &data->o_res.delegation,
1965                                 data->o_res.pagemod_limit);
1966
1967         if (data->o_res.do_recall)
1968                 nfs_async_inode_return_delegation(state->inode,
1969                                                   &data->o_res.delegation);
1970 }
1971
1972 /*
1973  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1974  * and update the nfs4_state.
1975  */
1976 static struct nfs4_state *
1977 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1978 {
1979         struct inode *inode = data->state->inode;
1980         struct nfs4_state *state = data->state;
1981         int ret;
1982
1983         if (!data->rpc_done) {
1984                 if (data->rpc_status)
1985                         return ERR_PTR(data->rpc_status);
1986                 return nfs4_try_open_cached(data);
1987         }
1988
1989         ret = nfs_refresh_inode(inode, &data->f_attr);
1990         if (ret)
1991                 return ERR_PTR(ret);
1992
1993         if (data->o_res.delegation_type != 0)
1994                 nfs4_opendata_check_deleg(data, state);
1995
1996         if (!update_open_stateid(state, &data->o_res.stateid,
1997                                 NULL, data->o_arg.fmode))
1998                 return ERR_PTR(-EAGAIN);
1999         refcount_inc(&state->count);
2000
2001         return state;
2002 }
2003
2004 static struct inode *
2005 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2006 {
2007         struct inode *inode;
2008
2009         switch (data->o_arg.claim) {
2010         case NFS4_OPEN_CLAIM_NULL:
2011         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2012         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2013                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2014                         return ERR_PTR(-EAGAIN);
2015                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2016                                 &data->f_attr);
2017                 break;
2018         default:
2019                 inode = d_inode(data->dentry);
2020                 ihold(inode);
2021                 nfs_refresh_inode(inode, &data->f_attr);
2022         }
2023         return inode;
2024 }
2025
2026 static struct nfs4_state *
2027 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2028 {
2029         struct nfs4_state *state;
2030         struct inode *inode;
2031
2032         inode = nfs4_opendata_get_inode(data);
2033         if (IS_ERR(inode))
2034                 return ERR_CAST(inode);
2035         if (data->state != NULL && data->state->inode == inode) {
2036                 state = data->state;
2037                 refcount_inc(&state->count);
2038         } else
2039                 state = nfs4_get_open_state(inode, data->owner);
2040         iput(inode);
2041         if (state == NULL)
2042                 state = ERR_PTR(-ENOMEM);
2043         return state;
2044 }
2045
2046 static struct nfs4_state *
2047 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2048 {
2049         struct nfs4_state *state;
2050
2051         if (!data->rpc_done) {
2052                 state = nfs4_try_open_cached(data);
2053                 trace_nfs4_cached_open(data->state);
2054                 goto out;
2055         }
2056
2057         state = nfs4_opendata_find_nfs4_state(data);
2058         if (IS_ERR(state))
2059                 goto out;
2060
2061         if (data->o_res.delegation_type != 0)
2062                 nfs4_opendata_check_deleg(data, state);
2063         if (!update_open_stateid(state, &data->o_res.stateid,
2064                                 NULL, data->o_arg.fmode)) {
2065                 nfs4_put_open_state(state);
2066                 state = ERR_PTR(-EAGAIN);
2067         }
2068 out:
2069         nfs_release_seqid(data->o_arg.seqid);
2070         return state;
2071 }
2072
2073 static struct nfs4_state *
2074 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2075 {
2076         struct nfs4_state *ret;
2077
2078         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2079                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2080         else
2081                 ret = _nfs4_opendata_to_nfs4_state(data);
2082         nfs4_sequence_free_slot(&data->o_res.seq_res);
2083         return ret;
2084 }
2085
2086 static struct nfs_open_context *
2087 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2088 {
2089         struct nfs_inode *nfsi = NFS_I(state->inode);
2090         struct nfs_open_context *ctx;
2091
2092         rcu_read_lock();
2093         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2094                 if (ctx->state != state)
2095                         continue;
2096                 if ((ctx->mode & mode) != mode)
2097                         continue;
2098                 if (!get_nfs_open_context(ctx))
2099                         continue;
2100                 rcu_read_unlock();
2101                 return ctx;
2102         }
2103         rcu_read_unlock();
2104         return ERR_PTR(-ENOENT);
2105 }
2106
2107 static struct nfs_open_context *
2108 nfs4_state_find_open_context(struct nfs4_state *state)
2109 {
2110         struct nfs_open_context *ctx;
2111
2112         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2113         if (!IS_ERR(ctx))
2114                 return ctx;
2115         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2116         if (!IS_ERR(ctx))
2117                 return ctx;
2118         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2119 }
2120
2121 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2122                 struct nfs4_state *state, enum open_claim_type4 claim)
2123 {
2124         struct nfs4_opendata *opendata;
2125
2126         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2127                         NULL, claim, GFP_NOFS);
2128         if (opendata == NULL)
2129                 return ERR_PTR(-ENOMEM);
2130         opendata->state = state;
2131         refcount_inc(&state->count);
2132         return opendata;
2133 }
2134
2135 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2136                                     fmode_t fmode)
2137 {
2138         struct nfs4_state *newstate;
2139         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2140         int openflags = opendata->o_arg.open_flags;
2141         int ret;
2142
2143         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2144                 return 0;
2145         opendata->o_arg.fmode = fmode;
2146         opendata->o_arg.share_access =
2147                 nfs4_map_atomic_open_share(server, fmode, openflags);
2148         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2149         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2150         nfs4_init_opendata_res(opendata);
2151         ret = _nfs4_recover_proc_open(opendata);
2152         if (ret != 0)
2153                 return ret;
2154         newstate = nfs4_opendata_to_nfs4_state(opendata);
2155         if (IS_ERR(newstate))
2156                 return PTR_ERR(newstate);
2157         if (newstate != opendata->state)
2158                 ret = -ESTALE;
2159         nfs4_close_state(newstate, fmode);
2160         return ret;
2161 }
2162
2163 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2164 {
2165         int ret;
2166
2167         /* memory barrier prior to reading state->n_* */
2168         smp_rmb();
2169         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2170         if (ret != 0)
2171                 return ret;
2172         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2173         if (ret != 0)
2174                 return ret;
2175         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2176         if (ret != 0)
2177                 return ret;
2178         /*
2179          * We may have performed cached opens for all three recoveries.
2180          * Check if we need to update the current stateid.
2181          */
2182         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2183             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2184                 write_seqlock(&state->seqlock);
2185                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2186                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2187                 write_sequnlock(&state->seqlock);
2188         }
2189         return 0;
2190 }
2191
2192 /*
2193  * OPEN_RECLAIM:
2194  *      reclaim state on the server after a reboot.
2195  */
2196 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2197 {
2198         struct nfs_delegation *delegation;
2199         struct nfs4_opendata *opendata;
2200         fmode_t delegation_type = 0;
2201         int status;
2202
2203         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2204                         NFS4_OPEN_CLAIM_PREVIOUS);
2205         if (IS_ERR(opendata))
2206                 return PTR_ERR(opendata);
2207         rcu_read_lock();
2208         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2209         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2210                 delegation_type = delegation->type;
2211         rcu_read_unlock();
2212         opendata->o_arg.u.delegation_type = delegation_type;
2213         status = nfs4_open_recover(opendata, state);
2214         nfs4_opendata_put(opendata);
2215         return status;
2216 }
2217
2218 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2219 {
2220         struct nfs_server *server = NFS_SERVER(state->inode);
2221         struct nfs4_exception exception = { };
2222         int err;
2223         do {
2224                 err = _nfs4_do_open_reclaim(ctx, state);
2225                 trace_nfs4_open_reclaim(ctx, 0, err);
2226                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2227                         continue;
2228                 if (err != -NFS4ERR_DELAY)
2229                         break;
2230                 nfs4_handle_exception(server, err, &exception);
2231         } while (exception.retry);
2232         return err;
2233 }
2234
2235 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2236 {
2237         struct nfs_open_context *ctx;
2238         int ret;
2239
2240         ctx = nfs4_state_find_open_context(state);
2241         if (IS_ERR(ctx))
2242                 return -EAGAIN;
2243         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2244         nfs_state_clear_open_state_flags(state);
2245         ret = nfs4_do_open_reclaim(ctx, state);
2246         put_nfs_open_context(ctx);
2247         return ret;
2248 }
2249
2250 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2251 {
2252         switch (err) {
2253                 default:
2254                         printk(KERN_ERR "NFS: %s: unhandled error "
2255                                         "%d.\n", __func__, err);
2256                         fallthrough;
2257                 case 0:
2258                 case -ENOENT:
2259                 case -EAGAIN:
2260                 case -ESTALE:
2261                 case -ETIMEDOUT:
2262                         break;
2263                 case -NFS4ERR_BADSESSION:
2264                 case -NFS4ERR_BADSLOT:
2265                 case -NFS4ERR_BAD_HIGH_SLOT:
2266                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2267                 case -NFS4ERR_DEADSESSION:
2268                         return -EAGAIN;
2269                 case -NFS4ERR_STALE_CLIENTID:
2270                 case -NFS4ERR_STALE_STATEID:
2271                         /* Don't recall a delegation if it was lost */
2272                         nfs4_schedule_lease_recovery(server->nfs_client);
2273                         return -EAGAIN;
2274                 case -NFS4ERR_MOVED:
2275                         nfs4_schedule_migration_recovery(server);
2276                         return -EAGAIN;
2277                 case -NFS4ERR_LEASE_MOVED:
2278                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2279                         return -EAGAIN;
2280                 case -NFS4ERR_DELEG_REVOKED:
2281                 case -NFS4ERR_ADMIN_REVOKED:
2282                 case -NFS4ERR_EXPIRED:
2283                 case -NFS4ERR_BAD_STATEID:
2284                 case -NFS4ERR_OPENMODE:
2285                         nfs_inode_find_state_and_recover(state->inode,
2286                                         stateid);
2287                         nfs4_schedule_stateid_recovery(server, state);
2288                         return -EAGAIN;
2289                 case -NFS4ERR_DELAY:
2290                 case -NFS4ERR_GRACE:
2291                         ssleep(1);
2292                         return -EAGAIN;
2293                 case -ENOMEM:
2294                 case -NFS4ERR_DENIED:
2295                         if (fl) {
2296                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2297                                 if (lsp)
2298                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2299                         }
2300                         return 0;
2301         }
2302         return err;
2303 }
2304
2305 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2306                 struct nfs4_state *state, const nfs4_stateid *stateid)
2307 {
2308         struct nfs_server *server = NFS_SERVER(state->inode);
2309         struct nfs4_opendata *opendata;
2310         int err = 0;
2311
2312         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2313                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2314         if (IS_ERR(opendata))
2315                 return PTR_ERR(opendata);
2316         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2317         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2318                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2319                 if (err)
2320                         goto out;
2321         }
2322         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2323                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2324                 if (err)
2325                         goto out;
2326         }
2327         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2328                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2329                 if (err)
2330                         goto out;
2331         }
2332         nfs_state_clear_delegation(state);
2333 out:
2334         nfs4_opendata_put(opendata);
2335         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2336 }
2337
2338 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2339 {
2340         struct nfs4_opendata *data = calldata;
2341
2342         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2343                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2344 }
2345
2346 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2347 {
2348         struct nfs4_opendata *data = calldata;
2349
2350         nfs40_sequence_done(task, &data->c_res.seq_res);
2351
2352         data->rpc_status = task->tk_status;
2353         if (data->rpc_status == 0) {
2354                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2355                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2356                 renew_lease(data->o_res.server, data->timestamp);
2357                 data->rpc_done = true;
2358         }
2359 }
2360
2361 static void nfs4_open_confirm_release(void *calldata)
2362 {
2363         struct nfs4_opendata *data = calldata;
2364         struct nfs4_state *state = NULL;
2365
2366         /* If this request hasn't been cancelled, do nothing */
2367         if (!data->cancelled)
2368                 goto out_free;
2369         /* In case of error, no cleanup! */
2370         if (!data->rpc_done)
2371                 goto out_free;
2372         state = nfs4_opendata_to_nfs4_state(data);
2373         if (!IS_ERR(state))
2374                 nfs4_close_state(state, data->o_arg.fmode);
2375 out_free:
2376         nfs4_opendata_put(data);
2377 }
2378
2379 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2380         .rpc_call_prepare = nfs4_open_confirm_prepare,
2381         .rpc_call_done = nfs4_open_confirm_done,
2382         .rpc_release = nfs4_open_confirm_release,
2383 };
2384
2385 /*
2386  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2387  */
2388 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2389 {
2390         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2391         struct rpc_task *task;
2392         struct  rpc_message msg = {
2393                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2394                 .rpc_argp = &data->c_arg,
2395                 .rpc_resp = &data->c_res,
2396                 .rpc_cred = data->owner->so_cred,
2397         };
2398         struct rpc_task_setup task_setup_data = {
2399                 .rpc_client = server->client,
2400                 .rpc_message = &msg,
2401                 .callback_ops = &nfs4_open_confirm_ops,
2402                 .callback_data = data,
2403                 .workqueue = nfsiod_workqueue,
2404                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2405         };
2406         int status;
2407
2408         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2409                                 data->is_recover);
2410         kref_get(&data->kref);
2411         data->rpc_done = false;
2412         data->rpc_status = 0;
2413         data->timestamp = jiffies;
2414         task = rpc_run_task(&task_setup_data);
2415         if (IS_ERR(task))
2416                 return PTR_ERR(task);
2417         status = rpc_wait_for_completion_task(task);
2418         if (status != 0) {
2419                 data->cancelled = true;
2420                 smp_wmb();
2421         } else
2422                 status = data->rpc_status;
2423         rpc_put_task(task);
2424         return status;
2425 }
2426
2427 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2428 {
2429         struct nfs4_opendata *data = calldata;
2430         struct nfs4_state_owner *sp = data->owner;
2431         struct nfs_client *clp = sp->so_server->nfs_client;
2432         enum open_claim_type4 claim = data->o_arg.claim;
2433
2434         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2435                 goto out_wait;
2436         /*
2437          * Check if we still need to send an OPEN call, or if we can use
2438          * a delegation instead.
2439          */
2440         if (data->state != NULL) {
2441                 struct nfs_delegation *delegation;
2442
2443                 if (can_open_cached(data->state, data->o_arg.fmode,
2444                                         data->o_arg.open_flags, claim))
2445                         goto out_no_action;
2446                 rcu_read_lock();
2447                 delegation = nfs4_get_valid_delegation(data->state->inode);
2448                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2449                         goto unlock_no_action;
2450                 rcu_read_unlock();
2451         }
2452         /* Update client id. */
2453         data->o_arg.clientid = clp->cl_clientid;
2454         switch (claim) {
2455         default:
2456                 break;
2457         case NFS4_OPEN_CLAIM_PREVIOUS:
2458         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2459         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2460                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2461                 fallthrough;
2462         case NFS4_OPEN_CLAIM_FH:
2463                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2464         }
2465         data->timestamp = jiffies;
2466         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2467                                 &data->o_arg.seq_args,
2468                                 &data->o_res.seq_res,
2469                                 task) != 0)
2470                 nfs_release_seqid(data->o_arg.seqid);
2471
2472         /* Set the create mode (note dependency on the session type) */
2473         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2474         if (data->o_arg.open_flags & O_EXCL) {
2475                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2476                 if (clp->cl_mvops->minor_version == 0) {
2477                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2478                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2479                          * because ACCESS will return permission denied for
2480                          * all bits until close */
2481                         data->o_res.access_request = data->o_arg.access = 0;
2482                 } else if (nfs4_has_persistent_session(clp))
2483                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2484         }
2485         return;
2486 unlock_no_action:
2487         trace_nfs4_cached_open(data->state);
2488         rcu_read_unlock();
2489 out_no_action:
2490         task->tk_action = NULL;
2491 out_wait:
2492         nfs4_sequence_done(task, &data->o_res.seq_res);
2493 }
2494
2495 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2496 {
2497         struct nfs4_opendata *data = calldata;
2498
2499         data->rpc_status = task->tk_status;
2500
2501         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2502                 return;
2503
2504         if (task->tk_status == 0) {
2505                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2506                         switch (data->o_res.f_attr->mode & S_IFMT) {
2507                         case S_IFREG:
2508                                 break;
2509                         case S_IFLNK:
2510                                 data->rpc_status = -ELOOP;
2511                                 break;
2512                         case S_IFDIR:
2513                                 data->rpc_status = -EISDIR;
2514                                 break;
2515                         default:
2516                                 data->rpc_status = -ENOTDIR;
2517                         }
2518                 }
2519                 renew_lease(data->o_res.server, data->timestamp);
2520                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2521                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2522         }
2523         data->rpc_done = true;
2524 }
2525
2526 static void nfs4_open_release(void *calldata)
2527 {
2528         struct nfs4_opendata *data = calldata;
2529         struct nfs4_state *state = NULL;
2530
2531         /* If this request hasn't been cancelled, do nothing */
2532         if (!data->cancelled)
2533                 goto out_free;
2534         /* In case of error, no cleanup! */
2535         if (data->rpc_status != 0 || !data->rpc_done)
2536                 goto out_free;
2537         /* In case we need an open_confirm, no cleanup! */
2538         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2539                 goto out_free;
2540         state = nfs4_opendata_to_nfs4_state(data);
2541         if (!IS_ERR(state))
2542                 nfs4_close_state(state, data->o_arg.fmode);
2543 out_free:
2544         nfs4_opendata_put(data);
2545 }
2546
2547 static const struct rpc_call_ops nfs4_open_ops = {
2548         .rpc_call_prepare = nfs4_open_prepare,
2549         .rpc_call_done = nfs4_open_done,
2550         .rpc_release = nfs4_open_release,
2551 };
2552
2553 static int nfs4_run_open_task(struct nfs4_opendata *data,
2554                               struct nfs_open_context *ctx)
2555 {
2556         struct inode *dir = d_inode(data->dir);
2557         struct nfs_server *server = NFS_SERVER(dir);
2558         struct nfs_openargs *o_arg = &data->o_arg;
2559         struct nfs_openres *o_res = &data->o_res;
2560         struct rpc_task *task;
2561         struct rpc_message msg = {
2562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2563                 .rpc_argp = o_arg,
2564                 .rpc_resp = o_res,
2565                 .rpc_cred = data->owner->so_cred,
2566         };
2567         struct rpc_task_setup task_setup_data = {
2568                 .rpc_client = server->client,
2569                 .rpc_message = &msg,
2570                 .callback_ops = &nfs4_open_ops,
2571                 .callback_data = data,
2572                 .workqueue = nfsiod_workqueue,
2573                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2574         };
2575         int status;
2576
2577         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2578                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2579
2580         kref_get(&data->kref);
2581         data->rpc_done = false;
2582         data->rpc_status = 0;
2583         data->cancelled = false;
2584         data->is_recover = false;
2585         if (!ctx) {
2586                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2587                 data->is_recover = true;
2588                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2589         } else {
2590                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2591                 pnfs_lgopen_prepare(data, ctx);
2592         }
2593         task = rpc_run_task(&task_setup_data);
2594         if (IS_ERR(task))
2595                 return PTR_ERR(task);
2596         status = rpc_wait_for_completion_task(task);
2597         if (status != 0) {
2598                 data->cancelled = true;
2599                 smp_wmb();
2600         } else
2601                 status = data->rpc_status;
2602         rpc_put_task(task);
2603
2604         return status;
2605 }
2606
2607 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2608 {
2609         struct inode *dir = d_inode(data->dir);
2610         struct nfs_openres *o_res = &data->o_res;
2611         int status;
2612
2613         status = nfs4_run_open_task(data, NULL);
2614         if (status != 0 || !data->rpc_done)
2615                 return status;
2616
2617         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2618
2619         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2620                 status = _nfs4_proc_open_confirm(data);
2621
2622         return status;
2623 }
2624
2625 /*
2626  * Additional permission checks in order to distinguish between an
2627  * open for read, and an open for execute. This works around the
2628  * fact that NFSv4 OPEN treats read and execute permissions as being
2629  * the same.
2630  * Note that in the non-execute case, we want to turn off permission
2631  * checking if we just created a new file (POSIX open() semantics).
2632  */
2633 static int nfs4_opendata_access(const struct cred *cred,
2634                                 struct nfs4_opendata *opendata,
2635                                 struct nfs4_state *state, fmode_t fmode,
2636                                 int openflags)
2637 {
2638         struct nfs_access_entry cache;
2639         u32 mask, flags;
2640
2641         /* access call failed or for some reason the server doesn't
2642          * support any access modes -- defer access call until later */
2643         if (opendata->o_res.access_supported == 0)
2644                 return 0;
2645
2646         mask = 0;
2647         /*
2648          * Use openflags to check for exec, because fmode won't
2649          * always have FMODE_EXEC set when file open for exec.
2650          */
2651         if (openflags & __FMODE_EXEC) {
2652                 /* ONLY check for exec rights */
2653                 if (S_ISDIR(state->inode->i_mode))
2654                         mask = NFS4_ACCESS_LOOKUP;
2655                 else
2656                         mask = NFS4_ACCESS_EXECUTE;
2657         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2658                 mask = NFS4_ACCESS_READ;
2659
2660         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2661         nfs_access_add_cache(state->inode, &cache, cred);
2662
2663         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2664         if ((mask & ~cache.mask & flags) == 0)
2665                 return 0;
2666
2667         return -EACCES;
2668 }
2669
2670 /*
2671  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2672  */
2673 static int _nfs4_proc_open(struct nfs4_opendata *data,
2674                            struct nfs_open_context *ctx)
2675 {
2676         struct inode *dir = d_inode(data->dir);
2677         struct nfs_server *server = NFS_SERVER(dir);
2678         struct nfs_openargs *o_arg = &data->o_arg;
2679         struct nfs_openres *o_res = &data->o_res;
2680         int status;
2681
2682         status = nfs4_run_open_task(data, ctx);
2683         if (!data->rpc_done)
2684                 return status;
2685         if (status != 0) {
2686                 if (status == -NFS4ERR_BADNAME &&
2687                                 !(o_arg->open_flags & O_CREAT))
2688                         return -ENOENT;
2689                 return status;
2690         }
2691
2692         nfs_fattr_map_and_free_names(server, &data->f_attr);
2693
2694         if (o_arg->open_flags & O_CREAT) {
2695                 if (o_arg->open_flags & O_EXCL)
2696                         data->file_created = true;
2697                 else if (o_res->cinfo.before != o_res->cinfo.after)
2698                         data->file_created = true;
2699                 if (data->file_created ||
2700                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2701                         nfs4_update_changeattr(dir, &o_res->cinfo,
2702                                         o_res->f_attr->time_start,
2703                                         NFS_INO_INVALID_DATA);
2704         }
2705         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2706                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2707         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2708                 status = _nfs4_proc_open_confirm(data);
2709                 if (status != 0)
2710                         return status;
2711         }
2712         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2713                 struct nfs_fh *fh = &o_res->fh;
2714
2715                 nfs4_sequence_free_slot(&o_res->seq_res);
2716                 if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
2717                         fh = NFS_FH(d_inode(data->dentry));
2718                 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
2719         }
2720         return 0;
2721 }
2722
2723 /*
2724  * OPEN_EXPIRED:
2725  *      reclaim state on the server after a network partition.
2726  *      Assumes caller holds the appropriate lock
2727  */
2728 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2729 {
2730         struct nfs4_opendata *opendata;
2731         int ret;
2732
2733         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2734         if (IS_ERR(opendata))
2735                 return PTR_ERR(opendata);
2736         /*
2737          * We're not recovering a delegation, so ask for no delegation.
2738          * Otherwise the recovery thread could deadlock with an outstanding
2739          * delegation return.
2740          */
2741         opendata->o_arg.open_flags = O_DIRECT;
2742         ret = nfs4_open_recover(opendata, state);
2743         if (ret == -ESTALE)
2744                 d_drop(ctx->dentry);
2745         nfs4_opendata_put(opendata);
2746         return ret;
2747 }
2748
2749 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2750 {
2751         struct nfs_server *server = NFS_SERVER(state->inode);
2752         struct nfs4_exception exception = { };
2753         int err;
2754
2755         do {
2756                 err = _nfs4_open_expired(ctx, state);
2757                 trace_nfs4_open_expired(ctx, 0, err);
2758                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2759                         continue;
2760                 switch (err) {
2761                 default:
2762                         goto out;
2763                 case -NFS4ERR_GRACE:
2764                 case -NFS4ERR_DELAY:
2765                         nfs4_handle_exception(server, err, &exception);
2766                         err = 0;
2767                 }
2768         } while (exception.retry);
2769 out:
2770         return err;
2771 }
2772
2773 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2774 {
2775         struct nfs_open_context *ctx;
2776         int ret;
2777
2778         ctx = nfs4_state_find_open_context(state);
2779         if (IS_ERR(ctx))
2780                 return -EAGAIN;
2781         ret = nfs4_do_open_expired(ctx, state);
2782         put_nfs_open_context(ctx);
2783         return ret;
2784 }
2785
2786 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2787                 const nfs4_stateid *stateid)
2788 {
2789         nfs_remove_bad_delegation(state->inode, stateid);
2790         nfs_state_clear_delegation(state);
2791 }
2792
2793 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2794 {
2795         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2796                 nfs_finish_clear_delegation_stateid(state, NULL);
2797 }
2798
2799 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2800 {
2801         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2802         nfs40_clear_delegation_stateid(state);
2803         nfs_state_clear_open_state_flags(state);
2804         return nfs4_open_expired(sp, state);
2805 }
2806
2807 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2808                 nfs4_stateid *stateid,
2809                 const struct cred *cred)
2810 {
2811         return -NFS4ERR_BAD_STATEID;
2812 }
2813
2814 #if defined(CONFIG_NFS_V4_1)
2815 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2816                 nfs4_stateid *stateid,
2817                 const struct cred *cred)
2818 {
2819         int status;
2820
2821         switch (stateid->type) {
2822         default:
2823                 break;
2824         case NFS4_INVALID_STATEID_TYPE:
2825         case NFS4_SPECIAL_STATEID_TYPE:
2826                 return -NFS4ERR_BAD_STATEID;
2827         case NFS4_REVOKED_STATEID_TYPE:
2828                 goto out_free;
2829         }
2830
2831         status = nfs41_test_stateid(server, stateid, cred);
2832         switch (status) {
2833         case -NFS4ERR_EXPIRED:
2834         case -NFS4ERR_ADMIN_REVOKED:
2835         case -NFS4ERR_DELEG_REVOKED:
2836                 break;
2837         default:
2838                 return status;
2839         }
2840 out_free:
2841         /* Ack the revoked state to the server */
2842         nfs41_free_stateid(server, stateid, cred, true);
2843         return -NFS4ERR_EXPIRED;
2844 }
2845
2846 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2847 {
2848         struct nfs_server *server = NFS_SERVER(state->inode);
2849         nfs4_stateid stateid;
2850         struct nfs_delegation *delegation;
2851         const struct cred *cred = NULL;
2852         int status, ret = NFS_OK;
2853
2854         /* Get the delegation credential for use by test/free_stateid */
2855         rcu_read_lock();
2856         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2857         if (delegation == NULL) {
2858                 rcu_read_unlock();
2859                 nfs_state_clear_delegation(state);
2860                 return NFS_OK;
2861         }
2862
2863         spin_lock(&delegation->lock);
2864         nfs4_stateid_copy(&stateid, &delegation->stateid);
2865
2866         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2867                                 &delegation->flags)) {
2868                 spin_unlock(&delegation->lock);
2869                 rcu_read_unlock();
2870                 return NFS_OK;
2871         }
2872
2873         if (delegation->cred)
2874                 cred = get_cred(delegation->cred);
2875         spin_unlock(&delegation->lock);
2876         rcu_read_unlock();
2877         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2878         trace_nfs4_test_delegation_stateid(state, NULL, status);
2879         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2880                 nfs_finish_clear_delegation_stateid(state, &stateid);
2881         else
2882                 ret = status;
2883
2884         put_cred(cred);
2885         return ret;
2886 }
2887
2888 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2889 {
2890         nfs4_stateid tmp;
2891
2892         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2893             nfs4_copy_delegation_stateid(state->inode, state->state,
2894                                 &tmp, NULL) &&
2895             nfs4_stateid_match_other(&state->stateid, &tmp))
2896                 nfs_state_set_delegation(state, &tmp, state->state);
2897         else
2898                 nfs_state_clear_delegation(state);
2899 }
2900
2901 /**
2902  * nfs41_check_expired_locks - possibly free a lock stateid
2903  *
2904  * @state: NFSv4 state for an inode
2905  *
2906  * Returns NFS_OK if recovery for this stateid is now finished.
2907  * Otherwise a negative NFS4ERR value is returned.
2908  */
2909 static int nfs41_check_expired_locks(struct nfs4_state *state)
2910 {
2911         int status, ret = NFS_OK;
2912         struct nfs4_lock_state *lsp, *prev = NULL;
2913         struct nfs_server *server = NFS_SERVER(state->inode);
2914
2915         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2916                 goto out;
2917
2918         spin_lock(&state->state_lock);
2919         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2920                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2921                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2922
2923                         refcount_inc(&lsp->ls_count);
2924                         spin_unlock(&state->state_lock);
2925
2926                         nfs4_put_lock_state(prev);
2927                         prev = lsp;
2928
2929                         status = nfs41_test_and_free_expired_stateid(server,
2930                                         &lsp->ls_stateid,
2931                                         cred);
2932                         trace_nfs4_test_lock_stateid(state, lsp, status);
2933                         if (status == -NFS4ERR_EXPIRED ||
2934                             status == -NFS4ERR_BAD_STATEID) {
2935                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2936                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2937                                 if (!recover_lost_locks)
2938                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2939                         } else if (status != NFS_OK) {
2940                                 ret = status;
2941                                 nfs4_put_lock_state(prev);
2942                                 goto out;
2943                         }
2944                         spin_lock(&state->state_lock);
2945                 }
2946         }
2947         spin_unlock(&state->state_lock);
2948         nfs4_put_lock_state(prev);
2949 out:
2950         return ret;
2951 }
2952
2953 /**
2954  * nfs41_check_open_stateid - possibly free an open stateid
2955  *
2956  * @state: NFSv4 state for an inode
2957  *
2958  * Returns NFS_OK if recovery for this stateid is now finished.
2959  * Otherwise a negative NFS4ERR value is returned.
2960  */
2961 static int nfs41_check_open_stateid(struct nfs4_state *state)
2962 {
2963         struct nfs_server *server = NFS_SERVER(state->inode);
2964         nfs4_stateid *stateid = &state->open_stateid;
2965         const struct cred *cred = state->owner->so_cred;
2966         int status;
2967
2968         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2969                 return -NFS4ERR_BAD_STATEID;
2970         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2971         trace_nfs4_test_open_stateid(state, NULL, status);
2972         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2973                 nfs_state_clear_open_state_flags(state);
2974                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2975                 return status;
2976         }
2977         if (nfs_open_stateid_recover_openmode(state))
2978                 return -NFS4ERR_OPENMODE;
2979         return NFS_OK;
2980 }
2981
2982 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2983 {
2984         int status;
2985
2986         status = nfs41_check_delegation_stateid(state);
2987         if (status != NFS_OK)
2988                 return status;
2989         nfs41_delegation_recover_stateid(state);
2990
2991         status = nfs41_check_expired_locks(state);
2992         if (status != NFS_OK)
2993                 return status;
2994         status = nfs41_check_open_stateid(state);
2995         if (status != NFS_OK)
2996                 status = nfs4_open_expired(sp, state);
2997         return status;
2998 }
2999 #endif
3000
3001 /*
3002  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
3003  * fields corresponding to attributes that were used to store the verifier.
3004  * Make sure we clobber those fields in the later setattr call
3005  */
3006 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
3007                                 struct iattr *sattr, struct nfs4_label **label)
3008 {
3009         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
3010         __u32 attrset[3];
3011         unsigned ret;
3012         unsigned i;
3013
3014         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3015                 attrset[i] = opendata->o_res.attrset[i];
3016                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3017                         attrset[i] &= ~bitmask[i];
3018         }
3019
3020         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3021                 sattr->ia_valid : 0;
3022
3023         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3024                 if (sattr->ia_valid & ATTR_ATIME_SET)
3025                         ret |= ATTR_ATIME_SET;
3026                 else
3027                         ret |= ATTR_ATIME;
3028         }
3029
3030         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3031                 if (sattr->ia_valid & ATTR_MTIME_SET)
3032                         ret |= ATTR_MTIME_SET;
3033                 else
3034                         ret |= ATTR_MTIME;
3035         }
3036
3037         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3038                 *label = NULL;
3039         return ret;
3040 }
3041
3042 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3043                 int flags, struct nfs_open_context *ctx)
3044 {
3045         struct nfs4_state_owner *sp = opendata->owner;
3046         struct nfs_server *server = sp->so_server;
3047         struct dentry *dentry;
3048         struct nfs4_state *state;
3049         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3050         struct inode *dir = d_inode(opendata->dir);
3051         unsigned long dir_verifier;
3052         unsigned int seq;
3053         int ret;
3054
3055         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3056         dir_verifier = nfs_save_change_attribute(dir);
3057
3058         ret = _nfs4_proc_open(opendata, ctx);
3059         if (ret != 0)
3060                 goto out;
3061
3062         state = _nfs4_opendata_to_nfs4_state(opendata);
3063         ret = PTR_ERR(state);
3064         if (IS_ERR(state))
3065                 goto out;
3066         ctx->state = state;
3067         if (server->caps & NFS_CAP_POSIX_LOCK)
3068                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3069         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3070                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3071         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3072                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3073
3074         dentry = opendata->dentry;
3075         if (d_really_is_negative(dentry)) {
3076                 struct dentry *alias;
3077                 d_drop(dentry);
3078                 alias = d_exact_alias(dentry, state->inode);
3079                 if (!alias)
3080                         alias = d_splice_alias(igrab(state->inode), dentry);
3081                 /* d_splice_alias() can't fail here - it's a non-directory */
3082                 if (alias) {
3083                         dput(ctx->dentry);
3084                         ctx->dentry = dentry = alias;
3085                 }
3086         }
3087
3088         switch(opendata->o_arg.claim) {
3089         default:
3090                 break;
3091         case NFS4_OPEN_CLAIM_NULL:
3092         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3093         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3094                 if (!opendata->rpc_done)
3095                         break;
3096                 if (opendata->o_res.delegation_type != 0)
3097                         dir_verifier = nfs_save_change_attribute(dir);
3098                 nfs_set_verifier(dentry, dir_verifier);
3099         }
3100
3101         /* Parse layoutget results before we check for access */
3102         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3103
3104         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3105                         acc_mode, flags);
3106         if (ret != 0)
3107                 goto out;
3108
3109         if (d_inode(dentry) == state->inode) {
3110                 nfs_inode_attach_open_context(ctx);
3111                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3112                         nfs4_schedule_stateid_recovery(server, state);
3113         }
3114
3115 out:
3116         if (!opendata->cancelled) {
3117                 if (opendata->lgp) {
3118                         nfs4_lgopen_release(opendata->lgp);
3119                         opendata->lgp = NULL;
3120                 }
3121                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3122         }
3123         return ret;
3124 }
3125
3126 /*
3127  * Returns a referenced nfs4_state
3128  */
3129 static int _nfs4_do_open(struct inode *dir,
3130                         struct nfs_open_context *ctx,
3131                         int flags,
3132                         const struct nfs4_open_createattrs *c,
3133                         int *opened)
3134 {
3135         struct nfs4_state_owner  *sp;
3136         struct nfs4_state     *state = NULL;
3137         struct nfs_server       *server = NFS_SERVER(dir);
3138         struct nfs4_opendata *opendata;
3139         struct dentry *dentry = ctx->dentry;
3140         const struct cred *cred = ctx->cred;
3141         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3142         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3143         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3144         struct iattr *sattr = c->sattr;
3145         struct nfs4_label *label = c->label;
3146         int status;
3147
3148         /* Protect against reboot recovery conflicts */
3149         status = -ENOMEM;
3150         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3151         if (sp == NULL) {
3152                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3153                 goto out_err;
3154         }
3155         status = nfs4_client_recover_expired_lease(server->nfs_client);
3156         if (status != 0)
3157                 goto err_put_state_owner;
3158         if (d_really_is_positive(dentry))
3159                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3160         status = -ENOMEM;
3161         if (d_really_is_positive(dentry))
3162                 claim = NFS4_OPEN_CLAIM_FH;
3163         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3164                         c, claim, GFP_KERNEL);
3165         if (opendata == NULL)
3166                 goto err_put_state_owner;
3167
3168         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3169                 if (!opendata->f_attr.mdsthreshold) {
3170                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3171                         if (!opendata->f_attr.mdsthreshold)
3172                                 goto err_opendata_put;
3173                 }
3174                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3175         }
3176         if (d_really_is_positive(dentry))
3177                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3178
3179         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3180         if (status != 0)
3181                 goto err_opendata_put;
3182         state = ctx->state;
3183
3184         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3185             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3186                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3187                 /*
3188                  * send create attributes which was not set by open
3189                  * with an extra setattr.
3190                  */
3191                 if (attrs || label) {
3192                         unsigned ia_old = sattr->ia_valid;
3193
3194                         sattr->ia_valid = attrs;
3195                         nfs_fattr_init(opendata->o_res.f_attr);
3196                         status = nfs4_do_setattr(state->inode, cred,
3197                                         opendata->o_res.f_attr, sattr,
3198                                         ctx, label);
3199                         if (status == 0) {
3200                                 nfs_setattr_update_inode(state->inode, sattr,
3201                                                 opendata->o_res.f_attr);
3202                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3203                         }
3204                         sattr->ia_valid = ia_old;
3205                 }
3206         }
3207         if (opened && opendata->file_created)
3208                 *opened = 1;
3209
3210         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3211                 *ctx_th = opendata->f_attr.mdsthreshold;
3212                 opendata->f_attr.mdsthreshold = NULL;
3213         }
3214
3215         nfs4_opendata_put(opendata);
3216         nfs4_put_state_owner(sp);
3217         return 0;
3218 err_opendata_put:
3219         nfs4_opendata_put(opendata);
3220 err_put_state_owner:
3221         nfs4_put_state_owner(sp);
3222 out_err:
3223         return status;
3224 }
3225
3226
3227 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3228                                         struct nfs_open_context *ctx,
3229                                         int flags,
3230                                         struct iattr *sattr,
3231                                         struct nfs4_label *label,
3232                                         int *opened)
3233 {
3234         struct nfs_server *server = NFS_SERVER(dir);
3235         struct nfs4_exception exception = {
3236                 .interruptible = true,
3237         };
3238         struct nfs4_state *res;
3239         struct nfs4_open_createattrs c = {
3240                 .label = label,
3241                 .sattr = sattr,
3242                 .verf = {
3243                         [0] = (__u32)jiffies,
3244                         [1] = (__u32)current->pid,
3245                 },
3246         };
3247         int status;
3248
3249         do {
3250                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3251                 res = ctx->state;
3252                 trace_nfs4_open_file(ctx, flags, status);
3253                 if (status == 0)
3254                         break;
3255                 /* NOTE: BAD_SEQID means the server and client disagree about the
3256                  * book-keeping w.r.t. state-changing operations
3257                  * (OPEN/CLOSE/LOCK/LOCKU...)
3258                  * It is actually a sign of a bug on the client or on the server.
3259                  *
3260                  * If we receive a BAD_SEQID error in the particular case of
3261                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3262                  * have unhashed the old state_owner for us, and that we can
3263                  * therefore safely retry using a new one. We should still warn
3264                  * the user though...
3265                  */
3266                 if (status == -NFS4ERR_BAD_SEQID) {
3267                         pr_warn_ratelimited("NFS: v4 server %s "
3268                                         " returned a bad sequence-id error!\n",
3269                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3270                         exception.retry = 1;
3271                         continue;
3272                 }
3273                 /*
3274                  * BAD_STATEID on OPEN means that the server cancelled our
3275                  * state before it received the OPEN_CONFIRM.
3276                  * Recover by retrying the request as per the discussion
3277                  * on Page 181 of RFC3530.
3278                  */
3279                 if (status == -NFS4ERR_BAD_STATEID) {
3280                         exception.retry = 1;
3281                         continue;
3282                 }
3283                 if (status == -NFS4ERR_EXPIRED) {
3284                         nfs4_schedule_lease_recovery(server->nfs_client);
3285                         exception.retry = 1;
3286                         continue;
3287                 }
3288                 if (status == -EAGAIN) {
3289                         /* We must have found a delegation */
3290                         exception.retry = 1;
3291                         continue;
3292                 }
3293                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3294                         continue;
3295                 res = ERR_PTR(nfs4_handle_exception(server,
3296                                         status, &exception));
3297         } while (exception.retry);
3298         return res;
3299 }
3300
3301 static int _nfs4_do_setattr(struct inode *inode,
3302                             struct nfs_setattrargs *arg,
3303                             struct nfs_setattrres *res,
3304                             const struct cred *cred,
3305                             struct nfs_open_context *ctx)
3306 {
3307         struct nfs_server *server = NFS_SERVER(inode);
3308         struct rpc_message msg = {
3309                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3310                 .rpc_argp       = arg,
3311                 .rpc_resp       = res,
3312                 .rpc_cred       = cred,
3313         };
3314         const struct cred *delegation_cred = NULL;
3315         unsigned long timestamp = jiffies;
3316         bool truncate;
3317         int status;
3318
3319         nfs_fattr_init(res->fattr);
3320
3321         /* Servers should only apply open mode checks for file size changes */
3322         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3323         if (!truncate) {
3324                 nfs4_inode_make_writeable(inode);
3325                 goto zero_stateid;
3326         }
3327
3328         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3329                 /* Use that stateid */
3330         } else if (ctx != NULL && ctx->state) {
3331                 struct nfs_lock_context *l_ctx;
3332                 if (!nfs4_valid_open_stateid(ctx->state))
3333                         return -EBADF;
3334                 l_ctx = nfs_get_lock_context(ctx);
3335                 if (IS_ERR(l_ctx))
3336                         return PTR_ERR(l_ctx);
3337                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3338                                                 &arg->stateid, &delegation_cred);
3339                 nfs_put_lock_context(l_ctx);
3340                 if (status == -EIO)
3341                         return -EBADF;
3342                 else if (status == -EAGAIN)
3343                         goto zero_stateid;
3344         } else {
3345 zero_stateid:
3346                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3347         }
3348         if (delegation_cred)
3349                 msg.rpc_cred = delegation_cred;
3350
3351         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3352
3353         put_cred(delegation_cred);
3354         if (status == 0 && ctx != NULL)
3355                 renew_lease(server, timestamp);
3356         trace_nfs4_setattr(inode, &arg->stateid, status);
3357         return status;
3358 }
3359
3360 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3361                            struct nfs_fattr *fattr, struct iattr *sattr,
3362                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3363 {
3364         struct nfs_server *server = NFS_SERVER(inode);
3365         __u32 bitmask[NFS4_BITMASK_SZ];
3366         struct nfs4_state *state = ctx ? ctx->state : NULL;
3367         struct nfs_setattrargs  arg = {
3368                 .fh             = NFS_FH(inode),
3369                 .iap            = sattr,
3370                 .server         = server,
3371                 .bitmask = bitmask,
3372                 .label          = ilabel,
3373         };
3374         struct nfs_setattrres  res = {
3375                 .fattr          = fattr,
3376                 .server         = server,
3377         };
3378         struct nfs4_exception exception = {
3379                 .state = state,
3380                 .inode = inode,
3381                 .stateid = &arg.stateid,
3382         };
3383         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3384         int err;
3385
3386         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3387                 adjust_flags |= NFS_INO_INVALID_MODE;
3388         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3389                 adjust_flags |= NFS_INO_INVALID_OTHER;
3390
3391         do {
3392                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3393                                         inode, adjust_flags);
3394
3395                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3396                 switch (err) {
3397                 case -NFS4ERR_OPENMODE:
3398                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3399                                 pr_warn_once("NFSv4: server %s is incorrectly "
3400                                                 "applying open mode checks to "
3401                                                 "a SETATTR that is not "
3402                                                 "changing file size.\n",
3403                                                 server->nfs_client->cl_hostname);
3404                         }
3405                         if (state && !(state->state & FMODE_WRITE)) {
3406                                 err = -EBADF;
3407                                 if (sattr->ia_valid & ATTR_OPEN)
3408                                         err = -EACCES;
3409                                 goto out;
3410                         }
3411                 }
3412                 err = nfs4_handle_exception(server, err, &exception);
3413         } while (exception.retry);
3414 out:
3415         return err;
3416 }
3417
3418 static bool
3419 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3420 {
3421         if (inode == NULL || !nfs_have_layout(inode))
3422                 return false;
3423
3424         return pnfs_wait_on_layoutreturn(inode, task);
3425 }
3426
3427 /*
3428  * Update the seqid of an open stateid
3429  */
3430 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3431                 struct nfs4_state *state)
3432 {
3433         __be32 seqid_open;
3434         u32 dst_seqid;
3435         int seq;
3436
3437         for (;;) {
3438                 if (!nfs4_valid_open_stateid(state))
3439                         break;
3440                 seq = read_seqbegin(&state->seqlock);
3441                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3442                         nfs4_stateid_copy(dst, &state->open_stateid);
3443                         if (read_seqretry(&state->seqlock, seq))
3444                                 continue;
3445                         break;
3446                 }
3447                 seqid_open = state->open_stateid.seqid;
3448                 if (read_seqretry(&state->seqlock, seq))
3449                         continue;
3450
3451                 dst_seqid = be32_to_cpu(dst->seqid);
3452                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3453                         dst->seqid = seqid_open;
3454                 break;
3455         }
3456 }
3457
3458 /*
3459  * Update the seqid of an open stateid after receiving
3460  * NFS4ERR_OLD_STATEID
3461  */
3462 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3463                 struct nfs4_state *state)
3464 {
3465         __be32 seqid_open;
3466         u32 dst_seqid;
3467         bool ret;
3468         int seq, status = -EAGAIN;
3469         DEFINE_WAIT(wait);
3470
3471         for (;;) {
3472                 ret = false;
3473                 if (!nfs4_valid_open_stateid(state))
3474                         break;
3475                 seq = read_seqbegin(&state->seqlock);
3476                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3477                         if (read_seqretry(&state->seqlock, seq))
3478                                 continue;
3479                         break;
3480                 }
3481
3482                 write_seqlock(&state->seqlock);
3483                 seqid_open = state->open_stateid.seqid;
3484
3485                 dst_seqid = be32_to_cpu(dst->seqid);
3486
3487                 /* Did another OPEN bump the state's seqid?  try again: */
3488                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3489                         dst->seqid = seqid_open;
3490                         write_sequnlock(&state->seqlock);
3491                         ret = true;
3492                         break;
3493                 }
3494
3495                 /* server says we're behind but we haven't seen the update yet */
3496                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3497                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3498                 write_sequnlock(&state->seqlock);
3499                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3500
3501                 if (fatal_signal_pending(current))
3502                         status = -EINTR;
3503                 else
3504                         if (schedule_timeout(5*HZ) != 0)
3505                                 status = 0;
3506
3507                 finish_wait(&state->waitq, &wait);
3508
3509                 if (!status)
3510                         continue;
3511                 if (status == -EINTR)
3512                         break;
3513
3514                 /* we slept the whole 5 seconds, we must have lost a seqid */
3515                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3516                 ret = true;
3517                 break;
3518         }
3519
3520         return ret;
3521 }
3522
3523 struct nfs4_closedata {
3524         struct inode *inode;
3525         struct nfs4_state *state;
3526         struct nfs_closeargs arg;
3527         struct nfs_closeres res;
3528         struct {
3529                 struct nfs4_layoutreturn_args arg;
3530                 struct nfs4_layoutreturn_res res;
3531                 struct nfs4_xdr_opaque_data ld_private;
3532                 u32 roc_barrier;
3533                 bool roc;
3534         } lr;
3535         struct nfs_fattr fattr;
3536         unsigned long timestamp;
3537 };
3538
3539 static void nfs4_free_closedata(void *data)
3540 {
3541         struct nfs4_closedata *calldata = data;
3542         struct nfs4_state_owner *sp = calldata->state->owner;
3543         struct super_block *sb = calldata->state->inode->i_sb;
3544
3545         if (calldata->lr.roc)
3546                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3547                                 calldata->res.lr_ret);
3548         nfs4_put_open_state(calldata->state);
3549         nfs_free_seqid(calldata->arg.seqid);
3550         nfs4_put_state_owner(sp);
3551         nfs_sb_deactive(sb);
3552         kfree(calldata);
3553 }
3554
3555 static void nfs4_close_done(struct rpc_task *task, void *data)
3556 {
3557         struct nfs4_closedata *calldata = data;
3558         struct nfs4_state *state = calldata->state;
3559         struct nfs_server *server = NFS_SERVER(calldata->inode);
3560         nfs4_stateid *res_stateid = NULL;
3561         struct nfs4_exception exception = {
3562                 .state = state,
3563                 .inode = calldata->inode,
3564                 .stateid = &calldata->arg.stateid,
3565         };
3566
3567         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3568                 return;
3569         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3570
3571         /* Handle Layoutreturn errors */
3572         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3573                           &calldata->res.lr_ret) == -EAGAIN)
3574                 goto out_restart;
3575
3576         /* hmm. we are done with the inode, and in the process of freeing
3577          * the state_owner. we keep this around to process errors
3578          */
3579         switch (task->tk_status) {
3580                 case 0:
3581                         res_stateid = &calldata->res.stateid;
3582                         renew_lease(server, calldata->timestamp);
3583                         break;
3584                 case -NFS4ERR_ACCESS:
3585                         if (calldata->arg.bitmask != NULL) {
3586                                 calldata->arg.bitmask = NULL;
3587                                 calldata->res.fattr = NULL;
3588                                 goto out_restart;
3589
3590                         }
3591                         break;
3592                 case -NFS4ERR_OLD_STATEID:
3593                         /* Did we race with OPEN? */
3594                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3595                                                 state))
3596                                 goto out_restart;
3597                         goto out_release;
3598                 case -NFS4ERR_ADMIN_REVOKED:
3599                 case -NFS4ERR_STALE_STATEID:
3600                 case -NFS4ERR_EXPIRED:
3601                         nfs4_free_revoked_stateid(server,
3602                                         &calldata->arg.stateid,
3603                                         task->tk_msg.rpc_cred);
3604                         fallthrough;
3605                 case -NFS4ERR_BAD_STATEID:
3606                         if (calldata->arg.fmode == 0)
3607                                 break;
3608                         fallthrough;
3609                 default:
3610                         task->tk_status = nfs4_async_handle_exception(task,
3611                                         server, task->tk_status, &exception);
3612                         if (exception.retry)
3613                                 goto out_restart;
3614         }
3615         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3616                         res_stateid, calldata->arg.fmode);
3617 out_release:
3618         task->tk_status = 0;
3619         nfs_release_seqid(calldata->arg.seqid);
3620         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3621         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3622         return;
3623 out_restart:
3624         task->tk_status = 0;
3625         rpc_restart_call_prepare(task);
3626         goto out_release;
3627 }
3628
3629 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3630 {
3631         struct nfs4_closedata *calldata = data;
3632         struct nfs4_state *state = calldata->state;
3633         struct inode *inode = calldata->inode;
3634         struct nfs_server *server = NFS_SERVER(inode);
3635         struct pnfs_layout_hdr *lo;
3636         bool is_rdonly, is_wronly, is_rdwr;
3637         int call_close = 0;
3638
3639         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3640                 goto out_wait;
3641
3642         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3643         spin_lock(&state->owner->so_lock);
3644         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3645         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3646         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3647         /* Calculate the change in open mode */
3648         calldata->arg.fmode = 0;
3649         if (state->n_rdwr == 0) {
3650                 if (state->n_rdonly == 0)
3651                         call_close |= is_rdonly;
3652                 else if (is_rdonly)
3653                         calldata->arg.fmode |= FMODE_READ;
3654                 if (state->n_wronly == 0)
3655                         call_close |= is_wronly;
3656                 else if (is_wronly)
3657                         calldata->arg.fmode |= FMODE_WRITE;
3658                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3659                         call_close |= is_rdwr;
3660         } else if (is_rdwr)
3661                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3662
3663         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3664         if (!nfs4_valid_open_stateid(state))
3665                 call_close = 0;
3666         spin_unlock(&state->owner->so_lock);
3667
3668         if (!call_close) {
3669                 /* Note: exit _without_ calling nfs4_close_done */
3670                 goto out_no_action;
3671         }
3672
3673         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3674                 nfs_release_seqid(calldata->arg.seqid);
3675                 goto out_wait;
3676         }
3677
3678         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3679         if (lo && !pnfs_layout_is_valid(lo)) {
3680                 calldata->arg.lr_args = NULL;
3681                 calldata->res.lr_res = NULL;
3682         }
3683
3684         if (calldata->arg.fmode == 0)
3685                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3686
3687         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3688                 /* Close-to-open cache consistency revalidation */
3689                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3690                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3691                                          server->cache_consistency_bitmask,
3692                                          inode, 0);
3693                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3694                 } else
3695                         calldata->arg.bitmask = NULL;
3696         }
3697
3698         calldata->arg.share_access =
3699                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3700                                 calldata->arg.fmode, 0);
3701
3702         if (calldata->res.fattr == NULL)
3703                 calldata->arg.bitmask = NULL;
3704         else if (calldata->arg.bitmask == NULL)
3705                 calldata->res.fattr = NULL;
3706         calldata->timestamp = jiffies;
3707         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3708                                 &calldata->arg.seq_args,
3709                                 &calldata->res.seq_res,
3710                                 task) != 0)
3711                 nfs_release_seqid(calldata->arg.seqid);
3712         return;
3713 out_no_action:
3714         task->tk_action = NULL;
3715 out_wait:
3716         nfs4_sequence_done(task, &calldata->res.seq_res);
3717 }
3718
3719 static const struct rpc_call_ops nfs4_close_ops = {
3720         .rpc_call_prepare = nfs4_close_prepare,
3721         .rpc_call_done = nfs4_close_done,
3722         .rpc_release = nfs4_free_closedata,
3723 };
3724
3725 /*
3726  * It is possible for data to be read/written from a mem-mapped file
3727  * after the sys_close call (which hits the vfs layer as a flush).
3728  * This means that we can't safely call nfsv4 close on a file until
3729  * the inode is cleared. This in turn means that we are not good
3730  * NFSv4 citizens - we do not indicate to the server to update the file's
3731  * share state even when we are done with one of the three share
3732  * stateid's in the inode.
3733  *
3734  * NOTE: Caller must be holding the sp->so_owner semaphore!
3735  */
3736 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3737 {
3738         struct nfs_server *server = NFS_SERVER(state->inode);
3739         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3740         struct nfs4_closedata *calldata;
3741         struct nfs4_state_owner *sp = state->owner;
3742         struct rpc_task *task;
3743         struct rpc_message msg = {
3744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3745                 .rpc_cred = state->owner->so_cred,
3746         };
3747         struct rpc_task_setup task_setup_data = {
3748                 .rpc_client = server->client,
3749                 .rpc_message = &msg,
3750                 .callback_ops = &nfs4_close_ops,
3751                 .workqueue = nfsiod_workqueue,
3752                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3753         };
3754         int status = -ENOMEM;
3755
3756         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3757                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3758
3759         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3760                 &task_setup_data.rpc_client, &msg);
3761
3762         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3763         if (calldata == NULL)
3764                 goto out;
3765         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3766         calldata->inode = state->inode;
3767         calldata->state = state;
3768         calldata->arg.fh = NFS_FH(state->inode);
3769         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3770                 goto out_free_calldata;
3771         /* Serialization for the sequence id */
3772         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3773         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3774         if (IS_ERR(calldata->arg.seqid))
3775                 goto out_free_calldata;
3776         nfs_fattr_init(&calldata->fattr);
3777         calldata->arg.fmode = 0;
3778         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3779         calldata->res.fattr = &calldata->fattr;
3780         calldata->res.seqid = calldata->arg.seqid;
3781         calldata->res.server = server;
3782         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3783         calldata->lr.roc = pnfs_roc(state->inode,
3784                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3785         if (calldata->lr.roc) {
3786                 calldata->arg.lr_args = &calldata->lr.arg;
3787                 calldata->res.lr_res = &calldata->lr.res;
3788         }
3789         nfs_sb_active(calldata->inode->i_sb);
3790
3791         msg.rpc_argp = &calldata->arg;
3792         msg.rpc_resp = &calldata->res;
3793         task_setup_data.callback_data = calldata;
3794         task = rpc_run_task(&task_setup_data);
3795         if (IS_ERR(task))
3796                 return PTR_ERR(task);
3797         status = 0;
3798         if (wait)
3799                 status = rpc_wait_for_completion_task(task);
3800         rpc_put_task(task);
3801         return status;
3802 out_free_calldata:
3803         kfree(calldata);
3804 out:
3805         nfs4_put_open_state(state);
3806         nfs4_put_state_owner(sp);
3807         return status;
3808 }
3809
3810 static struct inode *
3811 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3812                 int open_flags, struct iattr *attr, int *opened)
3813 {
3814         struct nfs4_state *state;
3815         struct nfs4_label l, *label;
3816
3817         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3818
3819         /* Protect against concurrent sillydeletes */
3820         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3821
3822         nfs4_label_release_security(label);
3823
3824         if (IS_ERR(state))
3825                 return ERR_CAST(state);
3826         return state->inode;
3827 }
3828
3829 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3830 {
3831         if (ctx->state == NULL)
3832                 return;
3833         if (is_sync)
3834                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3835         else
3836                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3837 }
3838
3839 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3840 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3841 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3842
3843 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3844 {
3845         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3846         struct nfs4_server_caps_arg args = {
3847                 .fhandle = fhandle,
3848                 .bitmask = bitmask,
3849         };
3850         struct nfs4_server_caps_res res = {};
3851         struct rpc_message msg = {
3852                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3853                 .rpc_argp = &args,
3854                 .rpc_resp = &res,
3855         };
3856         int status;
3857         int i;
3858
3859         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3860                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3861                      FATTR4_WORD0_LINK_SUPPORT |
3862                      FATTR4_WORD0_SYMLINK_SUPPORT |
3863                      FATTR4_WORD0_ACLSUPPORT |
3864                      FATTR4_WORD0_CASE_INSENSITIVE |
3865                      FATTR4_WORD0_CASE_PRESERVING;
3866         if (minorversion)
3867                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3868
3869         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3870         if (status == 0) {
3871                 /* Sanity check the server answers */
3872                 switch (minorversion) {
3873                 case 0:
3874                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3875                         res.attr_bitmask[2] = 0;
3876                         break;
3877                 case 1:
3878                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3879                         break;
3880                 case 2:
3881                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3882                 }
3883                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3884                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3885                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3886                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3887                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3888                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3889                         server->caps |= NFS_CAP_ACLS;
3890                 if (res.has_links != 0)
3891                         server->caps |= NFS_CAP_HARDLINKS;
3892                 if (res.has_symlinks != 0)
3893                         server->caps |= NFS_CAP_SYMLINKS;
3894                 if (res.case_insensitive)
3895                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3896                 if (res.case_preserving)
3897                         server->caps |= NFS_CAP_CASE_PRESERVING;
3898 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3899                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3900                         server->caps |= NFS_CAP_SECURITY_LABEL;
3901 #endif
3902                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3903                         server->caps |= NFS_CAP_FS_LOCATIONS;
3904                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3905                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3906                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3907                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3908                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3909                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3910                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3911                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3912                                 NFS_ATTR_FATTR_OWNER_NAME);
3913                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3914                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3915                                 NFS_ATTR_FATTR_GROUP_NAME);
3916                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3917                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3918                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3919                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3920                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3921                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3922                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3923                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3924                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3925                                 sizeof(server->attr_bitmask));
3926                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3927
3928                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3929                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3930                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3931                 server->cache_consistency_bitmask[2] = 0;
3932
3933                 /* Avoid a regression due to buggy server */
3934                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3935                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3936                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3937                         sizeof(server->exclcreat_bitmask));
3938
3939                 server->acl_bitmask = res.acl_bitmask;
3940                 server->fh_expire_type = res.fh_expire_type;
3941         }
3942
3943         return status;
3944 }
3945
3946 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3947 {
3948         struct nfs4_exception exception = {
3949                 .interruptible = true,
3950         };
3951         int err;
3952
3953         nfs4_server_set_init_caps(server);
3954         do {
3955                 err = nfs4_handle_exception(server,
3956                                 _nfs4_server_capabilities(server, fhandle),
3957                                 &exception);
3958         } while (exception.retry);
3959         return err;
3960 }
3961
3962 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3963                                           struct nfs_client *clp,
3964                                           struct nfs_server *server)
3965 {
3966         int i;
3967
3968         for (i = 0; i < location->nservers; i++) {
3969                 struct nfs4_string *srv_loc = &location->servers[i];
3970                 struct sockaddr_storage addr;
3971                 size_t addrlen;
3972                 struct xprt_create xprt_args = {
3973                         .ident = 0,
3974                         .net = clp->cl_net,
3975                 };
3976                 struct nfs4_add_xprt_data xprtdata = {
3977                         .clp = clp,
3978                 };
3979                 struct rpc_add_xprt_test rpcdata = {
3980                         .add_xprt_test = clp->cl_mvops->session_trunk,
3981                         .data = &xprtdata,
3982                 };
3983                 char *servername = NULL;
3984
3985                 if (!srv_loc->len)
3986                         continue;
3987
3988                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3989                                                 &addr, sizeof(addr),
3990                                                 clp->cl_net, server->port);
3991                 if (!addrlen)
3992                         return;
3993                 xprt_args.dstaddr = (struct sockaddr *)&addr;
3994                 xprt_args.addrlen = addrlen;
3995                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3996                 if (!servername)
3997                         return;
3998                 memcpy(servername, srv_loc->data, srv_loc->len);
3999                 servername[srv_loc->len] = '\0';
4000                 xprt_args.servername = servername;
4001
4002                 xprtdata.cred = nfs4_get_clid_cred(clp);
4003                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
4004                                   rpc_clnt_setup_test_and_add_xprt,
4005                                   &rpcdata);
4006                 if (xprtdata.cred)
4007                         put_cred(xprtdata.cred);
4008                 kfree(servername);
4009         }
4010 }
4011
4012 static int _nfs4_discover_trunking(struct nfs_server *server,
4013                                    struct nfs_fh *fhandle)
4014 {
4015         struct nfs4_fs_locations *locations = NULL;
4016         struct page *page;
4017         const struct cred *cred;
4018         struct nfs_client *clp = server->nfs_client;
4019         const struct nfs4_state_maintenance_ops *ops =
4020                 clp->cl_mvops->state_renewal_ops;
4021         int status = -ENOMEM, i;
4022
4023         cred = ops->get_state_renewal_cred(clp);
4024         if (cred == NULL) {
4025                 cred = nfs4_get_clid_cred(clp);
4026                 if (cred == NULL)
4027                         return -ENOKEY;
4028         }
4029
4030         page = alloc_page(GFP_KERNEL);
4031         if (!page)
4032                 goto out_put_cred;
4033         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4034         if (!locations)
4035                 goto out_free;
4036         locations->fattr = nfs_alloc_fattr();
4037         if (!locations->fattr)
4038                 goto out_free_2;
4039
4040         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4041                                          cred);
4042         if (status)
4043                 goto out_free_3;
4044
4045         for (i = 0; i < locations->nlocations; i++)
4046                 test_fs_location_for_trunking(&locations->locations[i], clp,
4047                                               server);
4048 out_free_3:
4049         kfree(locations->fattr);
4050 out_free_2:
4051         kfree(locations);
4052 out_free:
4053         __free_page(page);
4054 out_put_cred:
4055         put_cred(cred);
4056         return status;
4057 }
4058
4059 static int nfs4_discover_trunking(struct nfs_server *server,
4060                                   struct nfs_fh *fhandle)
4061 {
4062         struct nfs4_exception exception = {
4063                 .interruptible = true,
4064         };
4065         struct nfs_client *clp = server->nfs_client;
4066         int err = 0;
4067
4068         if (!nfs4_has_session(clp))
4069                 goto out;
4070         do {
4071                 err = nfs4_handle_exception(server,
4072                                 _nfs4_discover_trunking(server, fhandle),
4073                                 &exception);
4074         } while (exception.retry);
4075 out:
4076         return err;
4077 }
4078
4079 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4080                 struct nfs_fsinfo *info)
4081 {
4082         u32 bitmask[3];
4083         struct nfs4_lookup_root_arg args = {
4084                 .bitmask = bitmask,
4085         };
4086         struct nfs4_lookup_res res = {
4087                 .server = server,
4088                 .fattr = info->fattr,
4089                 .fh = fhandle,
4090         };
4091         struct rpc_message msg = {
4092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4093                 .rpc_argp = &args,
4094                 .rpc_resp = &res,
4095         };
4096
4097         bitmask[0] = nfs4_fattr_bitmap[0];
4098         bitmask[1] = nfs4_fattr_bitmap[1];
4099         /*
4100          * Process the label in the upcoming getfattr
4101          */
4102         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4103
4104         nfs_fattr_init(info->fattr);
4105         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4106 }
4107
4108 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4109                 struct nfs_fsinfo *info)
4110 {
4111         struct nfs4_exception exception = {
4112                 .interruptible = true,
4113         };
4114         int err;
4115         do {
4116                 err = _nfs4_lookup_root(server, fhandle, info);
4117                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4118                 switch (err) {
4119                 case 0:
4120                 case -NFS4ERR_WRONGSEC:
4121                         goto out;
4122                 default:
4123                         err = nfs4_handle_exception(server, err, &exception);
4124                 }
4125         } while (exception.retry);
4126 out:
4127         return err;
4128 }
4129
4130 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4131                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4132 {
4133         struct rpc_auth_create_args auth_args = {
4134                 .pseudoflavor = flavor,
4135         };
4136         struct rpc_auth *auth;
4137
4138         auth = rpcauth_create(&auth_args, server->client);
4139         if (IS_ERR(auth))
4140                 return -EACCES;
4141         return nfs4_lookup_root(server, fhandle, info);
4142 }
4143
4144 /*
4145  * Retry pseudoroot lookup with various security flavors.  We do this when:
4146  *
4147  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4148  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4149  *
4150  * Returns zero on success, or a negative NFS4ERR value, or a
4151  * negative errno value.
4152  */
4153 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4154                               struct nfs_fsinfo *info)
4155 {
4156         /* Per 3530bis 15.33.5 */
4157         static const rpc_authflavor_t flav_array[] = {
4158                 RPC_AUTH_GSS_KRB5P,
4159                 RPC_AUTH_GSS_KRB5I,
4160                 RPC_AUTH_GSS_KRB5,
4161                 RPC_AUTH_UNIX,                  /* courtesy */
4162                 RPC_AUTH_NULL,
4163         };
4164         int status = -EPERM;
4165         size_t i;
4166
4167         if (server->auth_info.flavor_len > 0) {
4168                 /* try each flavor specified by user */
4169                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4170                         status = nfs4_lookup_root_sec(server, fhandle, info,
4171                                                 server->auth_info.flavors[i]);
4172                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4173                                 continue;
4174                         break;
4175                 }
4176         } else {
4177                 /* no flavors specified by user, try default list */
4178                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4179                         status = nfs4_lookup_root_sec(server, fhandle, info,
4180                                                       flav_array[i]);
4181                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4182                                 continue;
4183                         break;
4184                 }
4185         }
4186
4187         /*
4188          * -EACCES could mean that the user doesn't have correct permissions
4189          * to access the mount.  It could also mean that we tried to mount
4190          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4191          * existing mount programs don't handle -EACCES very well so it should
4192          * be mapped to -EPERM instead.
4193          */
4194         if (status == -EACCES)
4195                 status = -EPERM;
4196         return status;
4197 }
4198
4199 /**
4200  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4201  * @server: initialized nfs_server handle
4202  * @fhandle: we fill in the pseudo-fs root file handle
4203  * @info: we fill in an FSINFO struct
4204  * @auth_probe: probe the auth flavours
4205  *
4206  * Returns zero on success, or a negative errno.
4207  */
4208 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4209                          struct nfs_fsinfo *info,
4210                          bool auth_probe)
4211 {
4212         int status = 0;
4213
4214         if (!auth_probe)
4215                 status = nfs4_lookup_root(server, fhandle, info);
4216
4217         if (auth_probe || status == NFS4ERR_WRONGSEC)
4218                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4219                                 fhandle, info);
4220
4221         if (status == 0)
4222                 status = nfs4_server_capabilities(server, fhandle);
4223         if (status == 0)
4224                 status = nfs4_do_fsinfo(server, fhandle, info);
4225
4226         return nfs4_map_errors(status);
4227 }
4228
4229 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4230                               struct nfs_fsinfo *info)
4231 {
4232         int error;
4233         struct nfs_fattr *fattr = info->fattr;
4234
4235         error = nfs4_server_capabilities(server, mntfh);
4236         if (error < 0) {
4237                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4238                 return error;
4239         }
4240
4241         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4242         if (error < 0) {
4243                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4244                 goto out;
4245         }
4246
4247         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4248             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4249                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4250
4251 out:
4252         return error;
4253 }
4254
4255 /*
4256  * Get locations and (maybe) other attributes of a referral.
4257  * Note that we'll actually follow the referral later when
4258  * we detect fsid mismatch in inode revalidation
4259  */
4260 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4261                              const struct qstr *name, struct nfs_fattr *fattr,
4262                              struct nfs_fh *fhandle)
4263 {
4264         int status = -ENOMEM;
4265         struct page *page = NULL;
4266         struct nfs4_fs_locations *locations = NULL;
4267
4268         page = alloc_page(GFP_KERNEL);
4269         if (page == NULL)
4270                 goto out;
4271         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4272         if (locations == NULL)
4273                 goto out;
4274
4275         locations->fattr = fattr;
4276
4277         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4278         if (status != 0)
4279                 goto out;
4280
4281         /*
4282          * If the fsid didn't change, this is a migration event, not a
4283          * referral.  Cause us to drop into the exception handler, which
4284          * will kick off migration recovery.
4285          */
4286         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4287                 dprintk("%s: server did not return a different fsid for"
4288                         " a referral at %s\n", __func__, name->name);
4289                 status = -NFS4ERR_MOVED;
4290                 goto out;
4291         }
4292         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4293         nfs_fixup_referral_attributes(fattr);
4294         memset(fhandle, 0, sizeof(struct nfs_fh));
4295 out:
4296         if (page)
4297                 __free_page(page);
4298         kfree(locations);
4299         return status;
4300 }
4301
4302 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4303                                 struct nfs_fattr *fattr, struct inode *inode)
4304 {
4305         __u32 bitmask[NFS4_BITMASK_SZ];
4306         struct nfs4_getattr_arg args = {
4307                 .fh = fhandle,
4308                 .bitmask = bitmask,
4309         };
4310         struct nfs4_getattr_res res = {
4311                 .fattr = fattr,
4312                 .server = server,
4313         };
4314         struct rpc_message msg = {
4315                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4316                 .rpc_argp = &args,
4317                 .rpc_resp = &res,
4318         };
4319         unsigned short task_flags = 0;
4320
4321         if (nfs4_has_session(server->nfs_client))
4322                 task_flags = RPC_TASK_MOVEABLE;
4323
4324         /* Is this is an attribute revalidation, subject to softreval? */
4325         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4326                 task_flags |= RPC_TASK_TIMEOUT;
4327
4328         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4329         nfs_fattr_init(fattr);
4330         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4331         return nfs4_do_call_sync(server->client, server, &msg,
4332                         &args.seq_args, &res.seq_res, task_flags);
4333 }
4334
4335 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4336                                 struct nfs_fattr *fattr, struct inode *inode)
4337 {
4338         struct nfs4_exception exception = {
4339                 .interruptible = true,
4340         };
4341         int err;
4342         do {
4343                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4344                 trace_nfs4_getattr(server, fhandle, fattr, err);
4345                 err = nfs4_handle_exception(server, err,
4346                                 &exception);
4347         } while (exception.retry);
4348         return err;
4349 }
4350
4351 /*
4352  * The file is not closed if it is opened due to the a request to change
4353  * the size of the file. The open call will not be needed once the
4354  * VFS layer lookup-intents are implemented.
4355  *
4356  * Close is called when the inode is destroyed.
4357  * If we haven't opened the file for O_WRONLY, we
4358  * need to in the size_change case to obtain a stateid.
4359  *
4360  * Got race?
4361  * Because OPEN is always done by name in nfsv4, it is
4362  * possible that we opened a different file by the same
4363  * name.  We can recognize this race condition, but we
4364  * can't do anything about it besides returning an error.
4365  *
4366  * This will be fixed with VFS changes (lookup-intent).
4367  */
4368 static int
4369 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4370                   struct iattr *sattr)
4371 {
4372         struct inode *inode = d_inode(dentry);
4373         const struct cred *cred = NULL;
4374         struct nfs_open_context *ctx = NULL;
4375         int status;
4376
4377         if (pnfs_ld_layoutret_on_setattr(inode) &&
4378             sattr->ia_valid & ATTR_SIZE &&
4379             sattr->ia_size < i_size_read(inode))
4380                 pnfs_commit_and_return_layout(inode);
4381
4382         nfs_fattr_init(fattr);
4383
4384         /* Deal with open(O_TRUNC) */
4385         if (sattr->ia_valid & ATTR_OPEN)
4386                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4387
4388         /* Optimization: if the end result is no change, don't RPC */
4389         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4390                 return 0;
4391
4392         /* Search for an existing open(O_WRITE) file */
4393         if (sattr->ia_valid & ATTR_FILE) {
4394
4395                 ctx = nfs_file_open_context(sattr->ia_file);
4396                 if (ctx)
4397                         cred = ctx->cred;
4398         }
4399
4400         /* Return any delegations if we're going to change ACLs */
4401         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4402                 nfs4_inode_make_writeable(inode);
4403
4404         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4405         if (status == 0) {
4406                 nfs_setattr_update_inode(inode, sattr, fattr);
4407                 nfs_setsecurity(inode, fattr);
4408         }
4409         return status;
4410 }
4411
4412 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4413                 struct dentry *dentry, struct nfs_fh *fhandle,
4414                 struct nfs_fattr *fattr)
4415 {
4416         struct nfs_server *server = NFS_SERVER(dir);
4417         int                    status;
4418         struct nfs4_lookup_arg args = {
4419                 .bitmask = server->attr_bitmask,
4420                 .dir_fh = NFS_FH(dir),
4421                 .name = &dentry->d_name,
4422         };
4423         struct nfs4_lookup_res res = {
4424                 .server = server,
4425                 .fattr = fattr,
4426                 .fh = fhandle,
4427         };
4428         struct rpc_message msg = {
4429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4430                 .rpc_argp = &args,
4431                 .rpc_resp = &res,
4432         };
4433         unsigned short task_flags = 0;
4434
4435         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4436                 task_flags = RPC_TASK_MOVEABLE;
4437
4438         /* Is this is an attribute revalidation, subject to softreval? */
4439         if (nfs_lookup_is_soft_revalidate(dentry))
4440                 task_flags |= RPC_TASK_TIMEOUT;
4441
4442         args.bitmask = nfs4_bitmask(server, fattr->label);
4443
4444         nfs_fattr_init(fattr);
4445
4446         dprintk("NFS call  lookup %pd2\n", dentry);
4447         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4448         status = nfs4_do_call_sync(clnt, server, &msg,
4449                         &args.seq_args, &res.seq_res, task_flags);
4450         dprintk("NFS reply lookup: %d\n", status);
4451         return status;
4452 }
4453
4454 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4455 {
4456         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4457                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4458         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4459         fattr->nlink = 2;
4460 }
4461
4462 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4463                                    struct dentry *dentry, struct nfs_fh *fhandle,
4464                                    struct nfs_fattr *fattr)
4465 {
4466         struct nfs4_exception exception = {
4467                 .interruptible = true,
4468         };
4469         struct rpc_clnt *client = *clnt;
4470         const struct qstr *name = &dentry->d_name;
4471         int err;
4472         do {
4473                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4474                 trace_nfs4_lookup(dir, name, err);
4475                 switch (err) {
4476                 case -NFS4ERR_BADNAME:
4477                         err = -ENOENT;
4478                         goto out;
4479                 case -NFS4ERR_MOVED:
4480                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4481                         if (err == -NFS4ERR_MOVED)
4482                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4483                         goto out;
4484                 case -NFS4ERR_WRONGSEC:
4485                         err = -EPERM;
4486                         if (client != *clnt)
4487                                 goto out;
4488                         client = nfs4_negotiate_security(client, dir, name);
4489                         if (IS_ERR(client))
4490                                 return PTR_ERR(client);
4491
4492                         exception.retry = 1;
4493                         break;
4494                 default:
4495                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4496                 }
4497         } while (exception.retry);
4498
4499 out:
4500         if (err == 0)
4501                 *clnt = client;
4502         else if (client != *clnt)
4503                 rpc_shutdown_client(client);
4504
4505         return err;
4506 }
4507
4508 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4509                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4510 {
4511         int status;
4512         struct rpc_clnt *client = NFS_CLIENT(dir);
4513
4514         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4515         if (client != NFS_CLIENT(dir)) {
4516                 rpc_shutdown_client(client);
4517                 nfs_fixup_secinfo_attributes(fattr);
4518         }
4519         return status;
4520 }
4521
4522 struct rpc_clnt *
4523 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4524                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4525 {
4526         struct rpc_clnt *client = NFS_CLIENT(dir);
4527         int status;
4528
4529         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4530         if (status < 0)
4531                 return ERR_PTR(status);
4532         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4533 }
4534
4535 static int _nfs4_proc_lookupp(struct inode *inode,
4536                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4537 {
4538         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4539         struct nfs_server *server = NFS_SERVER(inode);
4540         int                    status;
4541         struct nfs4_lookupp_arg args = {
4542                 .bitmask = server->attr_bitmask,
4543                 .fh = NFS_FH(inode),
4544         };
4545         struct nfs4_lookupp_res res = {
4546                 .server = server,
4547                 .fattr = fattr,
4548                 .fh = fhandle,
4549         };
4550         struct rpc_message msg = {
4551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4552                 .rpc_argp = &args,
4553                 .rpc_resp = &res,
4554         };
4555         unsigned short task_flags = 0;
4556
4557         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4558                 task_flags |= RPC_TASK_TIMEOUT;
4559
4560         args.bitmask = nfs4_bitmask(server, fattr->label);
4561
4562         nfs_fattr_init(fattr);
4563
4564         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4565         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4566                                 &res.seq_res, task_flags);
4567         dprintk("NFS reply lookupp: %d\n", status);
4568         return status;
4569 }
4570
4571 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4572                              struct nfs_fattr *fattr)
4573 {
4574         struct nfs4_exception exception = {
4575                 .interruptible = true,
4576         };
4577         int err;
4578         do {
4579                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4580                 trace_nfs4_lookupp(inode, err);
4581                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4582                                 &exception);
4583         } while (exception.retry);
4584         return err;
4585 }
4586
4587 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4588                              const struct cred *cred)
4589 {
4590         struct nfs_server *server = NFS_SERVER(inode);
4591         struct nfs4_accessargs args = {
4592                 .fh = NFS_FH(inode),
4593                 .access = entry->mask,
4594         };
4595         struct nfs4_accessres res = {
4596                 .server = server,
4597         };
4598         struct rpc_message msg = {
4599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4600                 .rpc_argp = &args,
4601                 .rpc_resp = &res,
4602                 .rpc_cred = cred,
4603         };
4604         int status = 0;
4605
4606         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4607                 res.fattr = nfs_alloc_fattr();
4608                 if (res.fattr == NULL)
4609                         return -ENOMEM;
4610                 args.bitmask = server->cache_consistency_bitmask;
4611         }
4612         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4613         if (!status) {
4614                 nfs_access_set_mask(entry, res.access);
4615                 if (res.fattr)
4616                         nfs_refresh_inode(inode, res.fattr);
4617         }
4618         nfs_free_fattr(res.fattr);
4619         return status;
4620 }
4621
4622 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4623                             const struct cred *cred)
4624 {
4625         struct nfs4_exception exception = {
4626                 .interruptible = true,
4627         };
4628         int err;
4629         do {
4630                 err = _nfs4_proc_access(inode, entry, cred);
4631                 trace_nfs4_access(inode, err);
4632                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4633                                 &exception);
4634         } while (exception.retry);
4635         return err;
4636 }
4637
4638 /*
4639  * TODO: For the time being, we don't try to get any attributes
4640  * along with any of the zero-copy operations READ, READDIR,
4641  * READLINK, WRITE.
4642  *
4643  * In the case of the first three, we want to put the GETATTR
4644  * after the read-type operation -- this is because it is hard
4645  * to predict the length of a GETATTR response in v4, and thus
4646  * align the READ data correctly.  This means that the GETATTR
4647  * may end up partially falling into the page cache, and we should
4648  * shift it into the 'tail' of the xdr_buf before processing.
4649  * To do this efficiently, we need to know the total length
4650  * of data received, which doesn't seem to be available outside
4651  * of the RPC layer.
4652  *
4653  * In the case of WRITE, we also want to put the GETATTR after
4654  * the operation -- in this case because we want to make sure
4655  * we get the post-operation mtime and size.
4656  *
4657  * Both of these changes to the XDR layer would in fact be quite
4658  * minor, but I decided to leave them for a subsequent patch.
4659  */
4660 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4661                 unsigned int pgbase, unsigned int pglen)
4662 {
4663         struct nfs4_readlink args = {
4664                 .fh       = NFS_FH(inode),
4665                 .pgbase   = pgbase,
4666                 .pglen    = pglen,
4667                 .pages    = &page,
4668         };
4669         struct nfs4_readlink_res res;
4670         struct rpc_message msg = {
4671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4672                 .rpc_argp = &args,
4673                 .rpc_resp = &res,
4674         };
4675
4676         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4677 }
4678
4679 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4680                 unsigned int pgbase, unsigned int pglen)
4681 {
4682         struct nfs4_exception exception = {
4683                 .interruptible = true,
4684         };
4685         int err;
4686         do {
4687                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4688                 trace_nfs4_readlink(inode, err);
4689                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4690                                 &exception);
4691         } while (exception.retry);
4692         return err;
4693 }
4694
4695 /*
4696  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4697  */
4698 static int
4699 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4700                  int flags)
4701 {
4702         struct nfs_server *server = NFS_SERVER(dir);
4703         struct nfs4_label l, *ilabel;
4704         struct nfs_open_context *ctx;
4705         struct nfs4_state *state;
4706         int status = 0;
4707
4708         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4709         if (IS_ERR(ctx))
4710                 return PTR_ERR(ctx);
4711
4712         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4713
4714         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4715                 sattr->ia_mode &= ~current_umask();
4716         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4717         if (IS_ERR(state)) {
4718                 status = PTR_ERR(state);
4719                 goto out;
4720         }
4721 out:
4722         nfs4_label_release_security(ilabel);
4723         put_nfs_open_context(ctx);
4724         return status;
4725 }
4726
4727 static int
4728 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4729 {
4730         struct nfs_server *server = NFS_SERVER(dir);
4731         struct nfs_removeargs args = {
4732                 .fh = NFS_FH(dir),
4733                 .name = *name,
4734         };
4735         struct nfs_removeres res = {
4736                 .server = server,
4737         };
4738         struct rpc_message msg = {
4739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4740                 .rpc_argp = &args,
4741                 .rpc_resp = &res,
4742         };
4743         unsigned long timestamp = jiffies;
4744         int status;
4745
4746         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4747         if (status == 0) {
4748                 spin_lock(&dir->i_lock);
4749                 /* Removing a directory decrements nlink in the parent */
4750                 if (ftype == NF4DIR && dir->i_nlink > 2)
4751                         nfs4_dec_nlink_locked(dir);
4752                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4753                                               NFS_INO_INVALID_DATA);
4754                 spin_unlock(&dir->i_lock);
4755         }
4756         return status;
4757 }
4758
4759 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4760 {
4761         struct nfs4_exception exception = {
4762                 .interruptible = true,
4763         };
4764         struct inode *inode = d_inode(dentry);
4765         int err;
4766
4767         if (inode) {
4768                 if (inode->i_nlink == 1)
4769                         nfs4_inode_return_delegation(inode);
4770                 else
4771                         nfs4_inode_make_writeable(inode);
4772         }
4773         do {
4774                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4775                 trace_nfs4_remove(dir, &dentry->d_name, err);
4776                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4777                                 &exception);
4778         } while (exception.retry);
4779         return err;
4780 }
4781
4782 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4783 {
4784         struct nfs4_exception exception = {
4785                 .interruptible = true,
4786         };
4787         int err;
4788
4789         do {
4790                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4791                 trace_nfs4_remove(dir, name, err);
4792                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4793                                 &exception);
4794         } while (exception.retry);
4795         return err;
4796 }
4797
4798 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4799                 struct dentry *dentry,
4800                 struct inode *inode)
4801 {
4802         struct nfs_removeargs *args = msg->rpc_argp;
4803         struct nfs_removeres *res = msg->rpc_resp;
4804
4805         res->server = NFS_SB(dentry->d_sb);
4806         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4807         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4808
4809         nfs_fattr_init(res->dir_attr);
4810
4811         if (inode) {
4812                 nfs4_inode_return_delegation(inode);
4813                 nfs_d_prune_case_insensitive_aliases(inode);
4814         }
4815 }
4816
4817 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4818 {
4819         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4820                         &data->args.seq_args,
4821                         &data->res.seq_res,
4822                         task);
4823 }
4824
4825 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4826 {
4827         struct nfs_unlinkdata *data = task->tk_calldata;
4828         struct nfs_removeres *res = &data->res;
4829
4830         if (!nfs4_sequence_done(task, &res->seq_res))
4831                 return 0;
4832         if (nfs4_async_handle_error(task, res->server, NULL,
4833                                     &data->timeout) == -EAGAIN)
4834                 return 0;
4835         if (task->tk_status == 0)
4836                 nfs4_update_changeattr(dir, &res->cinfo,
4837                                 res->dir_attr->time_start,
4838                                 NFS_INO_INVALID_DATA);
4839         return 1;
4840 }
4841
4842 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4843                 struct dentry *old_dentry,
4844                 struct dentry *new_dentry)
4845 {
4846         struct nfs_renameargs *arg = msg->rpc_argp;
4847         struct nfs_renameres *res = msg->rpc_resp;
4848         struct inode *old_inode = d_inode(old_dentry);
4849         struct inode *new_inode = d_inode(new_dentry);
4850
4851         if (old_inode)
4852                 nfs4_inode_make_writeable(old_inode);
4853         if (new_inode)
4854                 nfs4_inode_return_delegation(new_inode);
4855         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4856         res->server = NFS_SB(old_dentry->d_sb);
4857         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4858 }
4859
4860 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4861 {
4862         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4863                         &data->args.seq_args,
4864                         &data->res.seq_res,
4865                         task);
4866 }
4867
4868 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4869                                  struct inode *new_dir)
4870 {
4871         struct nfs_renamedata *data = task->tk_calldata;
4872         struct nfs_renameres *res = &data->res;
4873
4874         if (!nfs4_sequence_done(task, &res->seq_res))
4875                 return 0;
4876         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4877                 return 0;
4878
4879         if (task->tk_status == 0) {
4880                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4881                 if (new_dir != old_dir) {
4882                         /* Note: If we moved a directory, nlink will change */
4883                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4884                                         res->old_fattr->time_start,
4885                                         NFS_INO_INVALID_NLINK |
4886                                             NFS_INO_INVALID_DATA);
4887                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4888                                         res->new_fattr->time_start,
4889                                         NFS_INO_INVALID_NLINK |
4890                                             NFS_INO_INVALID_DATA);
4891                 } else
4892                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4893                                         res->old_fattr->time_start,
4894                                         NFS_INO_INVALID_DATA);
4895         }
4896         return 1;
4897 }
4898
4899 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4900 {
4901         struct nfs_server *server = NFS_SERVER(inode);
4902         __u32 bitmask[NFS4_BITMASK_SZ];
4903         struct nfs4_link_arg arg = {
4904                 .fh     = NFS_FH(inode),
4905                 .dir_fh = NFS_FH(dir),
4906                 .name   = name,
4907                 .bitmask = bitmask,
4908         };
4909         struct nfs4_link_res res = {
4910                 .server = server,
4911         };
4912         struct rpc_message msg = {
4913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4914                 .rpc_argp = &arg,
4915                 .rpc_resp = &res,
4916         };
4917         int status = -ENOMEM;
4918
4919         res.fattr = nfs_alloc_fattr_with_label(server);
4920         if (res.fattr == NULL)
4921                 goto out;
4922
4923         nfs4_inode_make_writeable(inode);
4924         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4925                                 NFS_INO_INVALID_CHANGE);
4926         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4927         if (!status) {
4928                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4929                                        NFS_INO_INVALID_DATA);
4930                 nfs4_inc_nlink(inode);
4931                 status = nfs_post_op_update_inode(inode, res.fattr);
4932                 if (!status)
4933                         nfs_setsecurity(inode, res.fattr);
4934         }
4935
4936 out:
4937         nfs_free_fattr(res.fattr);
4938         return status;
4939 }
4940
4941 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4942 {
4943         struct nfs4_exception exception = {
4944                 .interruptible = true,
4945         };
4946         int err;
4947         do {
4948                 err = nfs4_handle_exception(NFS_SERVER(inode),
4949                                 _nfs4_proc_link(inode, dir, name),
4950                                 &exception);
4951         } while (exception.retry);
4952         return err;
4953 }
4954
4955 struct nfs4_createdata {
4956         struct rpc_message msg;
4957         struct nfs4_create_arg arg;
4958         struct nfs4_create_res res;
4959         struct nfs_fh fh;
4960         struct nfs_fattr fattr;
4961 };
4962
4963 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4964                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4965 {
4966         struct nfs4_createdata *data;
4967
4968         data = kzalloc(sizeof(*data), GFP_KERNEL);
4969         if (data != NULL) {
4970                 struct nfs_server *server = NFS_SERVER(dir);
4971
4972                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4973                 if (IS_ERR(data->fattr.label))
4974                         goto out_free;
4975
4976                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4977                 data->msg.rpc_argp = &data->arg;
4978                 data->msg.rpc_resp = &data->res;
4979                 data->arg.dir_fh = NFS_FH(dir);
4980                 data->arg.server = server;
4981                 data->arg.name = name;
4982                 data->arg.attrs = sattr;
4983                 data->arg.ftype = ftype;
4984                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4985                 data->arg.umask = current_umask();
4986                 data->res.server = server;
4987                 data->res.fh = &data->fh;
4988                 data->res.fattr = &data->fattr;
4989                 nfs_fattr_init(data->res.fattr);
4990         }
4991         return data;
4992 out_free:
4993         kfree(data);
4994         return NULL;
4995 }
4996
4997 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4998 {
4999         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
5000                                     &data->arg.seq_args, &data->res.seq_res, 1);
5001         if (status == 0) {
5002                 spin_lock(&dir->i_lock);
5003                 /* Creating a directory bumps nlink in the parent */
5004                 if (data->arg.ftype == NF4DIR)
5005                         nfs4_inc_nlink_locked(dir);
5006                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
5007                                               data->res.fattr->time_start,
5008                                               NFS_INO_INVALID_DATA);
5009                 spin_unlock(&dir->i_lock);
5010                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
5011         }
5012         return status;
5013 }
5014
5015 static void nfs4_free_createdata(struct nfs4_createdata *data)
5016 {
5017         nfs4_label_free(data->fattr.label);
5018         kfree(data);
5019 }
5020
5021 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5022                 struct page *page, unsigned int len, struct iattr *sattr,
5023                 struct nfs4_label *label)
5024 {
5025         struct nfs4_createdata *data;
5026         int status = -ENAMETOOLONG;
5027
5028         if (len > NFS4_MAXPATHLEN)
5029                 goto out;
5030
5031         status = -ENOMEM;
5032         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5033         if (data == NULL)
5034                 goto out;
5035
5036         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5037         data->arg.u.symlink.pages = &page;
5038         data->arg.u.symlink.len = len;
5039         data->arg.label = label;
5040
5041         status = nfs4_do_create(dir, dentry, data);
5042
5043         nfs4_free_createdata(data);
5044 out:
5045         return status;
5046 }
5047
5048 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5049                 struct page *page, unsigned int len, struct iattr *sattr)
5050 {
5051         struct nfs4_exception exception = {
5052                 .interruptible = true,
5053         };
5054         struct nfs4_label l, *label;
5055         int err;
5056
5057         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5058
5059         do {
5060                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5061                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5062                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5063                                 &exception);
5064         } while (exception.retry);
5065
5066         nfs4_label_release_security(label);
5067         return err;
5068 }
5069
5070 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5071                 struct iattr *sattr, struct nfs4_label *label)
5072 {
5073         struct nfs4_createdata *data;
5074         int status = -ENOMEM;
5075
5076         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5077         if (data == NULL)
5078                 goto out;
5079
5080         data->arg.label = label;
5081         status = nfs4_do_create(dir, dentry, data);
5082
5083         nfs4_free_createdata(data);
5084 out:
5085         return status;
5086 }
5087
5088 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5089                 struct iattr *sattr)
5090 {
5091         struct nfs_server *server = NFS_SERVER(dir);
5092         struct nfs4_exception exception = {
5093                 .interruptible = true,
5094         };
5095         struct nfs4_label l, *label;
5096         int err;
5097
5098         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5099
5100         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5101                 sattr->ia_mode &= ~current_umask();
5102         do {
5103                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5104                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5105                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5106                                 &exception);
5107         } while (exception.retry);
5108         nfs4_label_release_security(label);
5109
5110         return err;
5111 }
5112
5113 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5114                               struct nfs_readdir_res *nr_res)
5115 {
5116         struct inode            *dir = d_inode(nr_arg->dentry);
5117         struct nfs_server       *server = NFS_SERVER(dir);
5118         struct nfs4_readdir_arg args = {
5119                 .fh = NFS_FH(dir),
5120                 .pages = nr_arg->pages,
5121                 .pgbase = 0,
5122                 .count = nr_arg->page_len,
5123                 .plus = nr_arg->plus,
5124         };
5125         struct nfs4_readdir_res res;
5126         struct rpc_message msg = {
5127                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5128                 .rpc_argp = &args,
5129                 .rpc_resp = &res,
5130                 .rpc_cred = nr_arg->cred,
5131         };
5132         int                     status;
5133
5134         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5135                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5136         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5137                 args.bitmask = server->attr_bitmask_nl;
5138         else
5139                 args.bitmask = server->attr_bitmask;
5140
5141         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5142         res.pgbase = args.pgbase;
5143         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5144                         &res.seq_res, 0);
5145         if (status >= 0) {
5146                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5147                 status += args.pgbase;
5148         }
5149
5150         nfs_invalidate_atime(dir);
5151
5152         dprintk("%s: returns %d\n", __func__, status);
5153         return status;
5154 }
5155
5156 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5157                              struct nfs_readdir_res *res)
5158 {
5159         struct nfs4_exception exception = {
5160                 .interruptible = true,
5161         };
5162         int err;
5163         do {
5164                 err = _nfs4_proc_readdir(arg, res);
5165                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5166                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5167                                             err, &exception);
5168         } while (exception.retry);
5169         return err;
5170 }
5171
5172 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5173                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5174 {
5175         struct nfs4_createdata *data;
5176         int mode = sattr->ia_mode;
5177         int status = -ENOMEM;
5178
5179         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5180         if (data == NULL)
5181                 goto out;
5182
5183         if (S_ISFIFO(mode))
5184                 data->arg.ftype = NF4FIFO;
5185         else if (S_ISBLK(mode)) {
5186                 data->arg.ftype = NF4BLK;
5187                 data->arg.u.device.specdata1 = MAJOR(rdev);
5188                 data->arg.u.device.specdata2 = MINOR(rdev);
5189         }
5190         else if (S_ISCHR(mode)) {
5191                 data->arg.ftype = NF4CHR;
5192                 data->arg.u.device.specdata1 = MAJOR(rdev);
5193                 data->arg.u.device.specdata2 = MINOR(rdev);
5194         } else if (!S_ISSOCK(mode)) {
5195                 status = -EINVAL;
5196                 goto out_free;
5197         }
5198
5199         data->arg.label = label;
5200         status = nfs4_do_create(dir, dentry, data);
5201 out_free:
5202         nfs4_free_createdata(data);
5203 out:
5204         return status;
5205 }
5206
5207 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5208                 struct iattr *sattr, dev_t rdev)
5209 {
5210         struct nfs_server *server = NFS_SERVER(dir);
5211         struct nfs4_exception exception = {
5212                 .interruptible = true,
5213         };
5214         struct nfs4_label l, *label;
5215         int err;
5216
5217         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5218
5219         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5220                 sattr->ia_mode &= ~current_umask();
5221         do {
5222                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5223                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5224                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5225                                 &exception);
5226         } while (exception.retry);
5227
5228         nfs4_label_release_security(label);
5229
5230         return err;
5231 }
5232
5233 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5234                  struct nfs_fsstat *fsstat)
5235 {
5236         struct nfs4_statfs_arg args = {
5237                 .fh = fhandle,
5238                 .bitmask = server->attr_bitmask,
5239         };
5240         struct nfs4_statfs_res res = {
5241                 .fsstat = fsstat,
5242         };
5243         struct rpc_message msg = {
5244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5245                 .rpc_argp = &args,
5246                 .rpc_resp = &res,
5247         };
5248
5249         nfs_fattr_init(fsstat->fattr);
5250         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5251 }
5252
5253 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5254 {
5255         struct nfs4_exception exception = {
5256                 .interruptible = true,
5257         };
5258         int err;
5259         do {
5260                 err = nfs4_handle_exception(server,
5261                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5262                                 &exception);
5263         } while (exception.retry);
5264         return err;
5265 }
5266
5267 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5268                 struct nfs_fsinfo *fsinfo)
5269 {
5270         struct nfs4_fsinfo_arg args = {
5271                 .fh = fhandle,
5272                 .bitmask = server->attr_bitmask,
5273         };
5274         struct nfs4_fsinfo_res res = {
5275                 .fsinfo = fsinfo,
5276         };
5277         struct rpc_message msg = {
5278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5279                 .rpc_argp = &args,
5280                 .rpc_resp = &res,
5281         };
5282
5283         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5284 }
5285
5286 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5287 {
5288         struct nfs4_exception exception = {
5289                 .interruptible = true,
5290         };
5291         int err;
5292
5293         do {
5294                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5295                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5296                 if (err == 0) {
5297                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5298                         break;
5299                 }
5300                 err = nfs4_handle_exception(server, err, &exception);
5301         } while (exception.retry);
5302         return err;
5303 }
5304
5305 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5306 {
5307         int error;
5308
5309         nfs_fattr_init(fsinfo->fattr);
5310         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5311         if (error == 0) {
5312                 /* block layout checks this! */
5313                 server->pnfs_blksize = fsinfo->blksize;
5314                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5315         }
5316
5317         return error;
5318 }
5319
5320 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5321                 struct nfs_pathconf *pathconf)
5322 {
5323         struct nfs4_pathconf_arg args = {
5324                 .fh = fhandle,
5325                 .bitmask = server->attr_bitmask,
5326         };
5327         struct nfs4_pathconf_res res = {
5328                 .pathconf = pathconf,
5329         };
5330         struct rpc_message msg = {
5331                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5332                 .rpc_argp = &args,
5333                 .rpc_resp = &res,
5334         };
5335
5336         /* None of the pathconf attributes are mandatory to implement */
5337         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5338                 memset(pathconf, 0, sizeof(*pathconf));
5339                 return 0;
5340         }
5341
5342         nfs_fattr_init(pathconf->fattr);
5343         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5344 }
5345
5346 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5347                 struct nfs_pathconf *pathconf)
5348 {
5349         struct nfs4_exception exception = {
5350                 .interruptible = true,
5351         };
5352         int err;
5353
5354         do {
5355                 err = nfs4_handle_exception(server,
5356                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5357                                 &exception);
5358         } while (exception.retry);
5359         return err;
5360 }
5361
5362 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5363                 const struct nfs_open_context *ctx,
5364                 const struct nfs_lock_context *l_ctx,
5365                 fmode_t fmode)
5366 {
5367         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5368 }
5369 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5370
5371 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5372                 const struct nfs_open_context *ctx,
5373                 const struct nfs_lock_context *l_ctx,
5374                 fmode_t fmode)
5375 {
5376         nfs4_stateid _current_stateid;
5377
5378         /* If the current stateid represents a lost lock, then exit */
5379         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5380                 return true;
5381         return nfs4_stateid_match(stateid, &_current_stateid);
5382 }
5383
5384 static bool nfs4_error_stateid_expired(int err)
5385 {
5386         switch (err) {
5387         case -NFS4ERR_DELEG_REVOKED:
5388         case -NFS4ERR_ADMIN_REVOKED:
5389         case -NFS4ERR_BAD_STATEID:
5390         case -NFS4ERR_STALE_STATEID:
5391         case -NFS4ERR_OLD_STATEID:
5392         case -NFS4ERR_OPENMODE:
5393         case -NFS4ERR_EXPIRED:
5394                 return true;
5395         }
5396         return false;
5397 }
5398
5399 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5400 {
5401         struct nfs_server *server = NFS_SERVER(hdr->inode);
5402
5403         trace_nfs4_read(hdr, task->tk_status);
5404         if (task->tk_status < 0) {
5405                 struct nfs4_exception exception = {
5406                         .inode = hdr->inode,
5407                         .state = hdr->args.context->state,
5408                         .stateid = &hdr->args.stateid,
5409                 };
5410                 task->tk_status = nfs4_async_handle_exception(task,
5411                                 server, task->tk_status, &exception);
5412                 if (exception.retry) {
5413                         rpc_restart_call_prepare(task);
5414                         return -EAGAIN;
5415                 }
5416         }
5417
5418         if (task->tk_status > 0)
5419                 renew_lease(server, hdr->timestamp);
5420         return 0;
5421 }
5422
5423 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5424                 struct nfs_pgio_args *args)
5425 {
5426
5427         if (!nfs4_error_stateid_expired(task->tk_status) ||
5428                 nfs4_stateid_is_current(&args->stateid,
5429                                 args->context,
5430                                 args->lock_context,
5431                                 FMODE_READ))
5432                 return false;
5433         rpc_restart_call_prepare(task);
5434         return true;
5435 }
5436
5437 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5438                                          struct nfs_pgio_header *hdr)
5439 {
5440         struct nfs_server *server = NFS_SERVER(hdr->inode);
5441         struct rpc_message *msg = &task->tk_msg;
5442
5443         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5444             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5445                 server->caps &= ~NFS_CAP_READ_PLUS;
5446                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5447                 rpc_restart_call_prepare(task);
5448                 return true;
5449         }
5450         return false;
5451 }
5452
5453 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5454 {
5455         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5456                 return -EAGAIN;
5457         if (nfs4_read_stateid_changed(task, &hdr->args))
5458                 return -EAGAIN;
5459         if (nfs4_read_plus_not_supported(task, hdr))
5460                 return -EAGAIN;
5461         if (task->tk_status > 0)
5462                 nfs_invalidate_atime(hdr->inode);
5463         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5464                                     nfs4_read_done_cb(task, hdr);
5465 }
5466
5467 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5468 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5469                                     struct rpc_message *msg)
5470 {
5471         /* Note: We don't use READ_PLUS with pNFS yet */
5472         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5473                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5474                 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
5475         }
5476         return false;
5477 }
5478 #else
5479 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5480                                     struct rpc_message *msg)
5481 {
5482         return false;
5483 }
5484 #endif /* CONFIG_NFS_V4_2 */
5485
5486 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5487                                  struct rpc_message *msg)
5488 {
5489         hdr->timestamp   = jiffies;
5490         if (!hdr->pgio_done_cb)
5491                 hdr->pgio_done_cb = nfs4_read_done_cb;
5492         if (!nfs42_read_plus_support(hdr, msg))
5493                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5494         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5495 }
5496
5497 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5498                                       struct nfs_pgio_header *hdr)
5499 {
5500         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5501                         &hdr->args.seq_args,
5502                         &hdr->res.seq_res,
5503                         task))
5504                 return 0;
5505         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5506                                 hdr->args.lock_context,
5507                                 hdr->rw_mode) == -EIO)
5508                 return -EIO;
5509         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5510                 return -EIO;
5511         return 0;
5512 }
5513
5514 static int nfs4_write_done_cb(struct rpc_task *task,
5515                               struct nfs_pgio_header *hdr)
5516 {
5517         struct inode *inode = hdr->inode;
5518
5519         trace_nfs4_write(hdr, task->tk_status);
5520         if (task->tk_status < 0) {
5521                 struct nfs4_exception exception = {
5522                         .inode = hdr->inode,
5523                         .state = hdr->args.context->state,
5524                         .stateid = &hdr->args.stateid,
5525                 };
5526                 task->tk_status = nfs4_async_handle_exception(task,
5527                                 NFS_SERVER(inode), task->tk_status,
5528                                 &exception);
5529                 if (exception.retry) {
5530                         rpc_restart_call_prepare(task);
5531                         return -EAGAIN;
5532                 }
5533         }
5534         if (task->tk_status >= 0) {
5535                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5536                 nfs_writeback_update_inode(hdr);
5537         }
5538         return 0;
5539 }
5540
5541 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5542                 struct nfs_pgio_args *args)
5543 {
5544
5545         if (!nfs4_error_stateid_expired(task->tk_status) ||
5546                 nfs4_stateid_is_current(&args->stateid,
5547                                 args->context,
5548                                 args->lock_context,
5549                                 FMODE_WRITE))
5550                 return false;
5551         rpc_restart_call_prepare(task);
5552         return true;
5553 }
5554
5555 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5556 {
5557         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5558                 return -EAGAIN;
5559         if (nfs4_write_stateid_changed(task, &hdr->args))
5560                 return -EAGAIN;
5561         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5562                 nfs4_write_done_cb(task, hdr);
5563 }
5564
5565 static
5566 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5567 {
5568         /* Don't request attributes for pNFS or O_DIRECT writes */
5569         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5570                 return false;
5571         /* Otherwise, request attributes if and only if we don't hold
5572          * a delegation
5573          */
5574         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5575 }
5576
5577 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5578                       struct inode *inode, unsigned long cache_validity)
5579 {
5580         struct nfs_server *server = NFS_SERVER(inode);
5581         unsigned int i;
5582
5583         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5584         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5585
5586         if (cache_validity & NFS_INO_INVALID_CHANGE)
5587                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5588         if (cache_validity & NFS_INO_INVALID_ATIME)
5589                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5590         if (cache_validity & NFS_INO_INVALID_MODE)
5591                 bitmask[1] |= FATTR4_WORD1_MODE;
5592         if (cache_validity & NFS_INO_INVALID_OTHER)
5593                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5594         if (cache_validity & NFS_INO_INVALID_NLINK)
5595                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5596         if (cache_validity & NFS_INO_INVALID_CTIME)
5597                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5598         if (cache_validity & NFS_INO_INVALID_MTIME)
5599                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5600         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5601                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5602
5603         if (cache_validity & NFS_INO_INVALID_SIZE)
5604                 bitmask[0] |= FATTR4_WORD0_SIZE;
5605
5606         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5607                 bitmask[i] &= server->attr_bitmask[i];
5608 }
5609
5610 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5611                                   struct rpc_message *msg,
5612                                   struct rpc_clnt **clnt)
5613 {
5614         struct nfs_server *server = NFS_SERVER(hdr->inode);
5615
5616         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5617                 hdr->args.bitmask = NULL;
5618                 hdr->res.fattr = NULL;
5619         } else {
5620                 nfs4_bitmask_set(hdr->args.bitmask_store,
5621                                  server->cache_consistency_bitmask,
5622                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5623                 hdr->args.bitmask = hdr->args.bitmask_store;
5624         }
5625
5626         if (!hdr->pgio_done_cb)
5627                 hdr->pgio_done_cb = nfs4_write_done_cb;
5628         hdr->res.server = server;
5629         hdr->timestamp   = jiffies;
5630
5631         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5632         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5633         nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
5634 }
5635
5636 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5637 {
5638         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5639                         &data->args.seq_args,
5640                         &data->res.seq_res,
5641                         task);
5642 }
5643
5644 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5645 {
5646         struct inode *inode = data->inode;
5647
5648         trace_nfs4_commit(data, task->tk_status);
5649         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5650                                     NULL, NULL) == -EAGAIN) {
5651                 rpc_restart_call_prepare(task);
5652                 return -EAGAIN;
5653         }
5654         return 0;
5655 }
5656
5657 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5658 {
5659         if (!nfs4_sequence_done(task, &data->res.seq_res))
5660                 return -EAGAIN;
5661         return data->commit_done_cb(task, data);
5662 }
5663
5664 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5665                                    struct rpc_clnt **clnt)
5666 {
5667         struct nfs_server *server = NFS_SERVER(data->inode);
5668
5669         if (data->commit_done_cb == NULL)
5670                 data->commit_done_cb = nfs4_commit_done_cb;
5671         data->res.server = server;
5672         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5673         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5674         nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
5675                         NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5676 }
5677
5678 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5679                                 struct nfs_commitres *res)
5680 {
5681         struct inode *dst_inode = file_inode(dst);
5682         struct nfs_server *server = NFS_SERVER(dst_inode);
5683         struct rpc_message msg = {
5684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5685                 .rpc_argp = args,
5686                 .rpc_resp = res,
5687         };
5688
5689         args->fh = NFS_FH(dst_inode);
5690         return nfs4_call_sync(server->client, server, &msg,
5691                         &args->seq_args, &res->seq_res, 1);
5692 }
5693
5694 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5695 {
5696         struct nfs_commitargs args = {
5697                 .offset = offset,
5698                 .count = count,
5699         };
5700         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5701         struct nfs4_exception exception = { };
5702         int status;
5703
5704         do {
5705                 status = _nfs4_proc_commit(dst, &args, res);
5706                 status = nfs4_handle_exception(dst_server, status, &exception);
5707         } while (exception.retry);
5708
5709         return status;
5710 }
5711
5712 struct nfs4_renewdata {
5713         struct nfs_client       *client;
5714         unsigned long           timestamp;
5715 };
5716
5717 /*
5718  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5719  * standalone procedure for queueing an asynchronous RENEW.
5720  */
5721 static void nfs4_renew_release(void *calldata)
5722 {
5723         struct nfs4_renewdata *data = calldata;
5724         struct nfs_client *clp = data->client;
5725
5726         if (refcount_read(&clp->cl_count) > 1)
5727                 nfs4_schedule_state_renewal(clp);
5728         nfs_put_client(clp);
5729         kfree(data);
5730 }
5731
5732 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5733 {
5734         struct nfs4_renewdata *data = calldata;
5735         struct nfs_client *clp = data->client;
5736         unsigned long timestamp = data->timestamp;
5737
5738         trace_nfs4_renew_async(clp, task->tk_status);
5739         switch (task->tk_status) {
5740         case 0:
5741                 break;
5742         case -NFS4ERR_LEASE_MOVED:
5743                 nfs4_schedule_lease_moved_recovery(clp);
5744                 break;
5745         default:
5746                 /* Unless we're shutting down, schedule state recovery! */
5747                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5748                         return;
5749                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5750                         nfs4_schedule_lease_recovery(clp);
5751                         return;
5752                 }
5753                 nfs4_schedule_path_down_recovery(clp);
5754         }
5755         do_renew_lease(clp, timestamp);
5756 }
5757
5758 static const struct rpc_call_ops nfs4_renew_ops = {
5759         .rpc_call_done = nfs4_renew_done,
5760         .rpc_release = nfs4_renew_release,
5761 };
5762
5763 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5764 {
5765         struct rpc_message msg = {
5766                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5767                 .rpc_argp       = clp,
5768                 .rpc_cred       = cred,
5769         };
5770         struct nfs4_renewdata *data;
5771
5772         if (renew_flags == 0)
5773                 return 0;
5774         if (!refcount_inc_not_zero(&clp->cl_count))
5775                 return -EIO;
5776         data = kmalloc(sizeof(*data), GFP_NOFS);
5777         if (data == NULL) {
5778                 nfs_put_client(clp);
5779                 return -ENOMEM;
5780         }
5781         data->client = clp;
5782         data->timestamp = jiffies;
5783         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5784                         &nfs4_renew_ops, data);
5785 }
5786
5787 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5788 {
5789         struct rpc_message msg = {
5790                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5791                 .rpc_argp       = clp,
5792                 .rpc_cred       = cred,
5793         };
5794         unsigned long now = jiffies;
5795         int status;
5796
5797         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5798         if (status < 0)
5799                 return status;
5800         do_renew_lease(clp, now);
5801         return 0;
5802 }
5803
5804 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5805                                       enum nfs4_acl_type type)
5806 {
5807         switch (type) {
5808         default:
5809                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5810         case NFS4ACL_DACL:
5811                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5812         case NFS4ACL_SACL:
5813                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5814         }
5815 }
5816
5817 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5818  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5819  * the stack.
5820  */
5821 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5822
5823 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5824                 struct page **pages)
5825 {
5826         struct page *newpage, **spages;
5827         int rc = 0;
5828         size_t len;
5829         spages = pages;
5830
5831         do {
5832                 len = min_t(size_t, PAGE_SIZE, buflen);
5833                 newpage = alloc_page(GFP_KERNEL);
5834
5835                 if (newpage == NULL)
5836                         goto unwind;
5837                 memcpy(page_address(newpage), buf, len);
5838                 buf += len;
5839                 buflen -= len;
5840                 *pages++ = newpage;
5841                 rc++;
5842         } while (buflen != 0);
5843
5844         return rc;
5845
5846 unwind:
5847         for(; rc > 0; rc--)
5848                 __free_page(spages[rc-1]);
5849         return -ENOMEM;
5850 }
5851
5852 struct nfs4_cached_acl {
5853         enum nfs4_acl_type type;
5854         int cached;
5855         size_t len;
5856         char data[];
5857 };
5858
5859 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5860 {
5861         struct nfs_inode *nfsi = NFS_I(inode);
5862
5863         spin_lock(&inode->i_lock);
5864         kfree(nfsi->nfs4_acl);
5865         nfsi->nfs4_acl = acl;
5866         spin_unlock(&inode->i_lock);
5867 }
5868
5869 static void nfs4_zap_acl_attr(struct inode *inode)
5870 {
5871         nfs4_set_cached_acl(inode, NULL);
5872 }
5873
5874 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5875                                     size_t buflen, enum nfs4_acl_type type)
5876 {
5877         struct nfs_inode *nfsi = NFS_I(inode);
5878         struct nfs4_cached_acl *acl;
5879         int ret = -ENOENT;
5880
5881         spin_lock(&inode->i_lock);
5882         acl = nfsi->nfs4_acl;
5883         if (acl == NULL)
5884                 goto out;
5885         if (acl->type != type)
5886                 goto out;
5887         if (buf == NULL) /* user is just asking for length */
5888                 goto out_len;
5889         if (acl->cached == 0)
5890                 goto out;
5891         ret = -ERANGE; /* see getxattr(2) man page */
5892         if (acl->len > buflen)
5893                 goto out;
5894         memcpy(buf, acl->data, acl->len);
5895 out_len:
5896         ret = acl->len;
5897 out:
5898         spin_unlock(&inode->i_lock);
5899         return ret;
5900 }
5901
5902 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5903                                   size_t pgbase, size_t acl_len,
5904                                   enum nfs4_acl_type type)
5905 {
5906         struct nfs4_cached_acl *acl;
5907         size_t buflen = sizeof(*acl) + acl_len;
5908
5909         if (buflen <= PAGE_SIZE) {
5910                 acl = kmalloc(buflen, GFP_KERNEL);
5911                 if (acl == NULL)
5912                         goto out;
5913                 acl->cached = 1;
5914                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5915         } else {
5916                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5917                 if (acl == NULL)
5918                         goto out;
5919                 acl->cached = 0;
5920         }
5921         acl->type = type;
5922         acl->len = acl_len;
5923 out:
5924         nfs4_set_cached_acl(inode, acl);
5925 }
5926
5927 /*
5928  * The getxattr API returns the required buffer length when called with a
5929  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5930  * the required buf.  On a NULL buf, we send a page of data to the server
5931  * guessing that the ACL request can be serviced by a page. If so, we cache
5932  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5933  * the cache. If not so, we throw away the page, and cache the required
5934  * length. The next getxattr call will then produce another round trip to
5935  * the server, this time with the input buf of the required size.
5936  */
5937 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5938                                        size_t buflen, enum nfs4_acl_type type)
5939 {
5940         struct page **pages;
5941         struct nfs_getaclargs args = {
5942                 .fh = NFS_FH(inode),
5943                 .acl_type = type,
5944                 .acl_len = buflen,
5945         };
5946         struct nfs_getaclres res = {
5947                 .acl_type = type,
5948                 .acl_len = buflen,
5949         };
5950         struct rpc_message msg = {
5951                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5952                 .rpc_argp = &args,
5953                 .rpc_resp = &res,
5954         };
5955         unsigned int npages;
5956         int ret = -ENOMEM, i;
5957         struct nfs_server *server = NFS_SERVER(inode);
5958
5959         if (buflen == 0)
5960                 buflen = server->rsize;
5961
5962         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5963         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5964         if (!pages)
5965                 return -ENOMEM;
5966
5967         args.acl_pages = pages;
5968
5969         for (i = 0; i < npages; i++) {
5970                 pages[i] = alloc_page(GFP_KERNEL);
5971                 if (!pages[i])
5972                         goto out_free;
5973         }
5974
5975         /* for decoding across pages */
5976         res.acl_scratch = alloc_page(GFP_KERNEL);
5977         if (!res.acl_scratch)
5978                 goto out_free;
5979
5980         args.acl_len = npages * PAGE_SIZE;
5981
5982         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5983                 __func__, buf, buflen, npages, args.acl_len);
5984         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5985                              &msg, &args.seq_args, &res.seq_res, 0);
5986         if (ret)
5987                 goto out_free;
5988
5989         /* Handle the case where the passed-in buffer is too short */
5990         if (res.acl_flags & NFS4_ACL_TRUNC) {
5991                 /* Did the user only issue a request for the acl length? */
5992                 if (buf == NULL)
5993                         goto out_ok;
5994                 ret = -ERANGE;
5995                 goto out_free;
5996         }
5997         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5998                               type);
5999         if (buf) {
6000                 if (res.acl_len > buflen) {
6001                         ret = -ERANGE;
6002                         goto out_free;
6003                 }
6004                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
6005         }
6006 out_ok:
6007         ret = res.acl_len;
6008 out_free:
6009         while (--i >= 0)
6010                 __free_page(pages[i]);
6011         if (res.acl_scratch)
6012                 __free_page(res.acl_scratch);
6013         kfree(pages);
6014         return ret;
6015 }
6016
6017 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6018                                      size_t buflen, enum nfs4_acl_type type)
6019 {
6020         struct nfs4_exception exception = {
6021                 .interruptible = true,
6022         };
6023         ssize_t ret;
6024         do {
6025                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6026                 trace_nfs4_get_acl(inode, ret);
6027                 if (ret >= 0)
6028                         break;
6029                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6030         } while (exception.retry);
6031         return ret;
6032 }
6033
6034 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6035                                  enum nfs4_acl_type type)
6036 {
6037         struct nfs_server *server = NFS_SERVER(inode);
6038         int ret;
6039
6040         if (!nfs4_server_supports_acls(server, type))
6041                 return -EOPNOTSUPP;
6042         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6043         if (ret < 0)
6044                 return ret;
6045         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6046                 nfs_zap_acl_cache(inode);
6047         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6048         if (ret != -ENOENT)
6049                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6050                  * but no cached acl data, just the acl length */
6051                 return ret;
6052         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6053 }
6054
6055 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6056                                size_t buflen, enum nfs4_acl_type type)
6057 {
6058         struct nfs_server *server = NFS_SERVER(inode);
6059         struct page *pages[NFS4ACL_MAXPAGES];
6060         struct nfs_setaclargs arg = {
6061                 .fh = NFS_FH(inode),
6062                 .acl_type = type,
6063                 .acl_len = buflen,
6064                 .acl_pages = pages,
6065         };
6066         struct nfs_setaclres res;
6067         struct rpc_message msg = {
6068                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6069                 .rpc_argp       = &arg,
6070                 .rpc_resp       = &res,
6071         };
6072         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6073         int ret, i;
6074
6075         /* You can't remove system.nfs4_acl: */
6076         if (buflen == 0)
6077                 return -EINVAL;
6078         if (!nfs4_server_supports_acls(server, type))
6079                 return -EOPNOTSUPP;
6080         if (npages > ARRAY_SIZE(pages))
6081                 return -ERANGE;
6082         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6083         if (i < 0)
6084                 return i;
6085         nfs4_inode_make_writeable(inode);
6086         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6087
6088         /*
6089          * Free each page after tx, so the only ref left is
6090          * held by the network stack
6091          */
6092         for (; i > 0; i--)
6093                 put_page(pages[i-1]);
6094
6095         /*
6096          * Acl update can result in inode attribute update.
6097          * so mark the attribute cache invalid.
6098          */
6099         spin_lock(&inode->i_lock);
6100         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6101                                              NFS_INO_INVALID_CTIME |
6102                                              NFS_INO_REVAL_FORCED);
6103         spin_unlock(&inode->i_lock);
6104         nfs_access_zap_cache(inode);
6105         nfs_zap_acl_cache(inode);
6106         return ret;
6107 }
6108
6109 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6110                              size_t buflen, enum nfs4_acl_type type)
6111 {
6112         struct nfs4_exception exception = { };
6113         int err;
6114         do {
6115                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6116                 trace_nfs4_set_acl(inode, err);
6117                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6118                         /*
6119                          * no need to retry since the kernel
6120                          * isn't involved in encoding the ACEs.
6121                          */
6122                         err = -EINVAL;
6123                         break;
6124                 }
6125                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6126                                 &exception);
6127         } while (exception.retry);
6128         return err;
6129 }
6130
6131 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6132 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6133                                         size_t buflen)
6134 {
6135         struct nfs_server *server = NFS_SERVER(inode);
6136         struct nfs4_label label = {0, 0, buflen, buf};
6137
6138         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6139         struct nfs_fattr fattr = {
6140                 .label = &label,
6141         };
6142         struct nfs4_getattr_arg arg = {
6143                 .fh             = NFS_FH(inode),
6144                 .bitmask        = bitmask,
6145         };
6146         struct nfs4_getattr_res res = {
6147                 .fattr          = &fattr,
6148                 .server         = server,
6149         };
6150         struct rpc_message msg = {
6151                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6152                 .rpc_argp       = &arg,
6153                 .rpc_resp       = &res,
6154         };
6155         int ret;
6156
6157         nfs_fattr_init(&fattr);
6158
6159         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6160         if (ret)
6161                 return ret;
6162         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6163                 return -ENOENT;
6164         return label.len;
6165 }
6166
6167 static int nfs4_get_security_label(struct inode *inode, void *buf,
6168                                         size_t buflen)
6169 {
6170         struct nfs4_exception exception = {
6171                 .interruptible = true,
6172         };
6173         int err;
6174
6175         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6176                 return -EOPNOTSUPP;
6177
6178         do {
6179                 err = _nfs4_get_security_label(inode, buf, buflen);
6180                 trace_nfs4_get_security_label(inode, err);
6181                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6182                                 &exception);
6183         } while (exception.retry);
6184         return err;
6185 }
6186
6187 static int _nfs4_do_set_security_label(struct inode *inode,
6188                 struct nfs4_label *ilabel,
6189                 struct nfs_fattr *fattr)
6190 {
6191
6192         struct iattr sattr = {0};
6193         struct nfs_server *server = NFS_SERVER(inode);
6194         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6195         struct nfs_setattrargs arg = {
6196                 .fh             = NFS_FH(inode),
6197                 .iap            = &sattr,
6198                 .server         = server,
6199                 .bitmask        = bitmask,
6200                 .label          = ilabel,
6201         };
6202         struct nfs_setattrres res = {
6203                 .fattr          = fattr,
6204                 .server         = server,
6205         };
6206         struct rpc_message msg = {
6207                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6208                 .rpc_argp       = &arg,
6209                 .rpc_resp       = &res,
6210         };
6211         int status;
6212
6213         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6214
6215         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6216         if (status)
6217                 dprintk("%s failed: %d\n", __func__, status);
6218
6219         return status;
6220 }
6221
6222 static int nfs4_do_set_security_label(struct inode *inode,
6223                 struct nfs4_label *ilabel,
6224                 struct nfs_fattr *fattr)
6225 {
6226         struct nfs4_exception exception = { };
6227         int err;
6228
6229         do {
6230                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6231                 trace_nfs4_set_security_label(inode, err);
6232                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6233                                 &exception);
6234         } while (exception.retry);
6235         return err;
6236 }
6237
6238 static int
6239 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6240 {
6241         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6242         struct nfs_fattr *fattr;
6243         int status;
6244
6245         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6246                 return -EOPNOTSUPP;
6247
6248         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6249         if (fattr == NULL)
6250                 return -ENOMEM;
6251
6252         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6253         if (status == 0)
6254                 nfs_setsecurity(inode, fattr);
6255
6256         return status;
6257 }
6258 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6259
6260
6261 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6262                                     nfs4_verifier *bootverf)
6263 {
6264         __be32 verf[2];
6265
6266         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6267                 /* An impossible timestamp guarantees this value
6268                  * will never match a generated boot time. */
6269                 verf[0] = cpu_to_be32(U32_MAX);
6270                 verf[1] = cpu_to_be32(U32_MAX);
6271         } else {
6272                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6273                 u64 ns = ktime_to_ns(nn->boot_time);
6274
6275                 verf[0] = cpu_to_be32(ns >> 32);
6276                 verf[1] = cpu_to_be32(ns);
6277         }
6278         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6279 }
6280
6281 static size_t
6282 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6283 {
6284         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6285         struct nfs_netns_client *nn_clp = nn->nfs_client;
6286         const char *id;
6287
6288         buf[0] = '\0';
6289
6290         if (nn_clp) {
6291                 rcu_read_lock();
6292                 id = rcu_dereference(nn_clp->identifier);
6293                 if (id)
6294                         strscpy(buf, id, buflen);
6295                 rcu_read_unlock();
6296         }
6297
6298         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6299                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6300
6301         return strlen(buf);
6302 }
6303
6304 static int
6305 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6306 {
6307         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6308         size_t buflen;
6309         size_t len;
6310         char *str;
6311
6312         if (clp->cl_owner_id != NULL)
6313                 return 0;
6314
6315         rcu_read_lock();
6316         len = 14 +
6317                 strlen(clp->cl_rpcclient->cl_nodename) +
6318                 1 +
6319                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6320                 1;
6321         rcu_read_unlock();
6322
6323         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6324         if (buflen)
6325                 len += buflen + 1;
6326
6327         if (len > NFS4_OPAQUE_LIMIT + 1)
6328                 return -EINVAL;
6329
6330         /*
6331          * Since this string is allocated at mount time, and held until the
6332          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6333          * about a memory-reclaim deadlock.
6334          */
6335         str = kmalloc(len, GFP_KERNEL);
6336         if (!str)
6337                 return -ENOMEM;
6338
6339         rcu_read_lock();
6340         if (buflen)
6341                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6342                           clp->cl_rpcclient->cl_nodename, buf,
6343                           rpc_peeraddr2str(clp->cl_rpcclient,
6344                                            RPC_DISPLAY_ADDR));
6345         else
6346                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6347                           clp->cl_rpcclient->cl_nodename,
6348                           rpc_peeraddr2str(clp->cl_rpcclient,
6349                                            RPC_DISPLAY_ADDR));
6350         rcu_read_unlock();
6351
6352         clp->cl_owner_id = str;
6353         return 0;
6354 }
6355
6356 static int
6357 nfs4_init_uniform_client_string(struct nfs_client *clp)
6358 {
6359         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6360         size_t buflen;
6361         size_t len;
6362         char *str;
6363
6364         if (clp->cl_owner_id != NULL)
6365                 return 0;
6366
6367         len = 10 + 10 + 1 + 10 + 1 +
6368                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6369
6370         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6371         if (buflen)
6372                 len += buflen + 1;
6373
6374         if (len > NFS4_OPAQUE_LIMIT + 1)
6375                 return -EINVAL;
6376
6377         /*
6378          * Since this string is allocated at mount time, and held until the
6379          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6380          * about a memory-reclaim deadlock.
6381          */
6382         str = kmalloc(len, GFP_KERNEL);
6383         if (!str)
6384                 return -ENOMEM;
6385
6386         if (buflen)
6387                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6388                           clp->rpc_ops->version, clp->cl_minorversion,
6389                           buf, clp->cl_rpcclient->cl_nodename);
6390         else
6391                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6392                           clp->rpc_ops->version, clp->cl_minorversion,
6393                           clp->cl_rpcclient->cl_nodename);
6394         clp->cl_owner_id = str;
6395         return 0;
6396 }
6397
6398 /*
6399  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6400  * services.  Advertise one based on the address family of the
6401  * clientaddr.
6402  */
6403 static unsigned int
6404 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6405 {
6406         if (strchr(clp->cl_ipaddr, ':') != NULL)
6407                 return scnprintf(buf, len, "tcp6");
6408         else
6409                 return scnprintf(buf, len, "tcp");
6410 }
6411
6412 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6413 {
6414         struct nfs4_setclientid *sc = calldata;
6415
6416         if (task->tk_status == 0)
6417                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6418 }
6419
6420 static const struct rpc_call_ops nfs4_setclientid_ops = {
6421         .rpc_call_done = nfs4_setclientid_done,
6422 };
6423
6424 /**
6425  * nfs4_proc_setclientid - Negotiate client ID
6426  * @clp: state data structure
6427  * @program: RPC program for NFSv4 callback service
6428  * @port: IP port number for NFS4 callback service
6429  * @cred: credential to use for this call
6430  * @res: where to place the result
6431  *
6432  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6433  */
6434 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6435                 unsigned short port, const struct cred *cred,
6436                 struct nfs4_setclientid_res *res)
6437 {
6438         nfs4_verifier sc_verifier;
6439         struct nfs4_setclientid setclientid = {
6440                 .sc_verifier = &sc_verifier,
6441                 .sc_prog = program,
6442                 .sc_clnt = clp,
6443         };
6444         struct rpc_message msg = {
6445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6446                 .rpc_argp = &setclientid,
6447                 .rpc_resp = res,
6448                 .rpc_cred = cred,
6449         };
6450         struct rpc_task_setup task_setup_data = {
6451                 .rpc_client = clp->cl_rpcclient,
6452                 .rpc_message = &msg,
6453                 .callback_ops = &nfs4_setclientid_ops,
6454                 .callback_data = &setclientid,
6455                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6456         };
6457         unsigned long now = jiffies;
6458         int status;
6459
6460         /* nfs_client_id4 */
6461         nfs4_init_boot_verifier(clp, &sc_verifier);
6462
6463         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6464                 status = nfs4_init_uniform_client_string(clp);
6465         else
6466                 status = nfs4_init_nonuniform_client_string(clp);
6467
6468         if (status)
6469                 goto out;
6470
6471         /* cb_client4 */
6472         setclientid.sc_netid_len =
6473                                 nfs4_init_callback_netid(clp,
6474                                                 setclientid.sc_netid,
6475                                                 sizeof(setclientid.sc_netid));
6476         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6477                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6478                                 clp->cl_ipaddr, port >> 8, port & 255);
6479
6480         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6481                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6482                 clp->cl_owner_id);
6483
6484         status = nfs4_call_sync_custom(&task_setup_data);
6485         if (setclientid.sc_cred) {
6486                 kfree(clp->cl_acceptor);
6487                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6488                 put_rpccred(setclientid.sc_cred);
6489         }
6490
6491         if (status == 0)
6492                 do_renew_lease(clp, now);
6493 out:
6494         trace_nfs4_setclientid(clp, status);
6495         dprintk("NFS reply setclientid: %d\n", status);
6496         return status;
6497 }
6498
6499 /**
6500  * nfs4_proc_setclientid_confirm - Confirm client ID
6501  * @clp: state data structure
6502  * @arg: result of a previous SETCLIENTID
6503  * @cred: credential to use for this call
6504  *
6505  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6506  */
6507 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6508                 struct nfs4_setclientid_res *arg,
6509                 const struct cred *cred)
6510 {
6511         struct rpc_message msg = {
6512                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6513                 .rpc_argp = arg,
6514                 .rpc_cred = cred,
6515         };
6516         int status;
6517
6518         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6519                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6520                 clp->cl_clientid);
6521         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6522                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6523         trace_nfs4_setclientid_confirm(clp, status);
6524         dprintk("NFS reply setclientid_confirm: %d\n", status);
6525         return status;
6526 }
6527
6528 struct nfs4_delegreturndata {
6529         struct nfs4_delegreturnargs args;
6530         struct nfs4_delegreturnres res;
6531         struct nfs_fh fh;
6532         nfs4_stateid stateid;
6533         unsigned long timestamp;
6534         struct {
6535                 struct nfs4_layoutreturn_args arg;
6536                 struct nfs4_layoutreturn_res res;
6537                 struct nfs4_xdr_opaque_data ld_private;
6538                 u32 roc_barrier;
6539                 bool roc;
6540         } lr;
6541         struct nfs_fattr fattr;
6542         int rpc_status;
6543         struct inode *inode;
6544 };
6545
6546 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6547 {
6548         struct nfs4_delegreturndata *data = calldata;
6549         struct nfs4_exception exception = {
6550                 .inode = data->inode,
6551                 .stateid = &data->stateid,
6552                 .task_is_privileged = data->args.seq_args.sa_privileged,
6553         };
6554
6555         if (!nfs4_sequence_done(task, &data->res.seq_res))
6556                 return;
6557
6558         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6559
6560         /* Handle Layoutreturn errors */
6561         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6562                           &data->res.lr_ret) == -EAGAIN)
6563                 goto out_restart;
6564
6565         switch (task->tk_status) {
6566         case 0:
6567                 renew_lease(data->res.server, data->timestamp);
6568                 break;
6569         case -NFS4ERR_ADMIN_REVOKED:
6570         case -NFS4ERR_DELEG_REVOKED:
6571         case -NFS4ERR_EXPIRED:
6572                 nfs4_free_revoked_stateid(data->res.server,
6573                                 data->args.stateid,
6574                                 task->tk_msg.rpc_cred);
6575                 fallthrough;
6576         case -NFS4ERR_BAD_STATEID:
6577         case -NFS4ERR_STALE_STATEID:
6578         case -ETIMEDOUT:
6579                 task->tk_status = 0;
6580                 break;
6581         case -NFS4ERR_OLD_STATEID:
6582                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6583                         nfs4_stateid_seqid_inc(&data->stateid);
6584                 if (data->args.bitmask) {
6585                         data->args.bitmask = NULL;
6586                         data->res.fattr = NULL;
6587                 }
6588                 goto out_restart;
6589         case -NFS4ERR_ACCESS:
6590                 if (data->args.bitmask) {
6591                         data->args.bitmask = NULL;
6592                         data->res.fattr = NULL;
6593                         goto out_restart;
6594                 }
6595                 fallthrough;
6596         default:
6597                 task->tk_status = nfs4_async_handle_exception(task,
6598                                 data->res.server, task->tk_status,
6599                                 &exception);
6600                 if (exception.retry)
6601                         goto out_restart;
6602         }
6603         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6604         data->rpc_status = task->tk_status;
6605         return;
6606 out_restart:
6607         task->tk_status = 0;
6608         rpc_restart_call_prepare(task);
6609 }
6610
6611 static void nfs4_delegreturn_release(void *calldata)
6612 {
6613         struct nfs4_delegreturndata *data = calldata;
6614         struct inode *inode = data->inode;
6615
6616         if (data->lr.roc)
6617                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6618                                  data->res.lr_ret);
6619         if (inode) {
6620                 nfs4_fattr_set_prechange(&data->fattr,
6621                                          inode_peek_iversion_raw(inode));
6622                 nfs_refresh_inode(inode, &data->fattr);
6623                 nfs_iput_and_deactive(inode);
6624         }
6625         kfree(calldata);
6626 }
6627
6628 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6629 {
6630         struct nfs4_delegreturndata *d_data;
6631         struct pnfs_layout_hdr *lo;
6632
6633         d_data = data;
6634
6635         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6636                 nfs4_sequence_done(task, &d_data->res.seq_res);
6637                 return;
6638         }
6639
6640         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6641         if (lo && !pnfs_layout_is_valid(lo)) {
6642                 d_data->args.lr_args = NULL;
6643                 d_data->res.lr_res = NULL;
6644         }
6645
6646         nfs4_setup_sequence(d_data->res.server->nfs_client,
6647                         &d_data->args.seq_args,
6648                         &d_data->res.seq_res,
6649                         task);
6650 }
6651
6652 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6653         .rpc_call_prepare = nfs4_delegreturn_prepare,
6654         .rpc_call_done = nfs4_delegreturn_done,
6655         .rpc_release = nfs4_delegreturn_release,
6656 };
6657
6658 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6659 {
6660         struct nfs4_delegreturndata *data;
6661         struct nfs_server *server = NFS_SERVER(inode);
6662         struct rpc_task *task;
6663         struct rpc_message msg = {
6664                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6665                 .rpc_cred = cred,
6666         };
6667         struct rpc_task_setup task_setup_data = {
6668                 .rpc_client = server->client,
6669                 .rpc_message = &msg,
6670                 .callback_ops = &nfs4_delegreturn_ops,
6671                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6672         };
6673         int status = 0;
6674
6675         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6676                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6677
6678         data = kzalloc(sizeof(*data), GFP_KERNEL);
6679         if (data == NULL)
6680                 return -ENOMEM;
6681
6682         nfs4_state_protect(server->nfs_client,
6683                         NFS_SP4_MACH_CRED_CLEANUP,
6684                         &task_setup_data.rpc_client, &msg);
6685
6686         data->args.fhandle = &data->fh;
6687         data->args.stateid = &data->stateid;
6688         nfs4_bitmask_set(data->args.bitmask_store,
6689                          server->cache_consistency_bitmask, inode, 0);
6690         data->args.bitmask = data->args.bitmask_store;
6691         nfs_copy_fh(&data->fh, NFS_FH(inode));
6692         nfs4_stateid_copy(&data->stateid, stateid);
6693         data->res.fattr = &data->fattr;
6694         data->res.server = server;
6695         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6696         data->lr.arg.ld_private = &data->lr.ld_private;
6697         nfs_fattr_init(data->res.fattr);
6698         data->timestamp = jiffies;
6699         data->rpc_status = 0;
6700         data->inode = nfs_igrab_and_active(inode);
6701         if (data->inode || issync) {
6702                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6703                                         cred);
6704                 if (data->lr.roc) {
6705                         data->args.lr_args = &data->lr.arg;
6706                         data->res.lr_res = &data->lr.res;
6707                 }
6708         }
6709
6710         if (!data->inode)
6711                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6712                                    1);
6713         else
6714                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6715                                    0);
6716         task_setup_data.callback_data = data;
6717         msg.rpc_argp = &data->args;
6718         msg.rpc_resp = &data->res;
6719         task = rpc_run_task(&task_setup_data);
6720         if (IS_ERR(task))
6721                 return PTR_ERR(task);
6722         if (!issync)
6723                 goto out;
6724         status = rpc_wait_for_completion_task(task);
6725         if (status != 0)
6726                 goto out;
6727         status = data->rpc_status;
6728 out:
6729         rpc_put_task(task);
6730         return status;
6731 }
6732
6733 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6734 {
6735         struct nfs_server *server = NFS_SERVER(inode);
6736         struct nfs4_exception exception = { };
6737         int err;
6738         do {
6739                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6740                 trace_nfs4_delegreturn(inode, stateid, err);
6741                 switch (err) {
6742                         case -NFS4ERR_STALE_STATEID:
6743                         case -NFS4ERR_EXPIRED:
6744                         case 0:
6745                                 return 0;
6746                 }
6747                 err = nfs4_handle_exception(server, err, &exception);
6748         } while (exception.retry);
6749         return err;
6750 }
6751
6752 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6753 {
6754         struct inode *inode = state->inode;
6755         struct nfs_server *server = NFS_SERVER(inode);
6756         struct nfs_client *clp = server->nfs_client;
6757         struct nfs_lockt_args arg = {
6758                 .fh = NFS_FH(inode),
6759                 .fl = request,
6760         };
6761         struct nfs_lockt_res res = {
6762                 .denied = request,
6763         };
6764         struct rpc_message msg = {
6765                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6766                 .rpc_argp       = &arg,
6767                 .rpc_resp       = &res,
6768                 .rpc_cred       = state->owner->so_cred,
6769         };
6770         struct nfs4_lock_state *lsp;
6771         int status;
6772
6773         arg.lock_owner.clientid = clp->cl_clientid;
6774         status = nfs4_set_lock_state(state, request);
6775         if (status != 0)
6776                 goto out;
6777         lsp = request->fl_u.nfs4_fl.owner;
6778         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6779         arg.lock_owner.s_dev = server->s_dev;
6780         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6781         switch (status) {
6782                 case 0:
6783                         request->fl_type = F_UNLCK;
6784                         break;
6785                 case -NFS4ERR_DENIED:
6786                         status = 0;
6787         }
6788         request->fl_ops->fl_release_private(request);
6789         request->fl_ops = NULL;
6790 out:
6791         return status;
6792 }
6793
6794 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6795 {
6796         struct nfs4_exception exception = {
6797                 .interruptible = true,
6798         };
6799         int err;
6800
6801         do {
6802                 err = _nfs4_proc_getlk(state, cmd, request);
6803                 trace_nfs4_get_lock(request, state, cmd, err);
6804                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6805                                 &exception);
6806         } while (exception.retry);
6807         return err;
6808 }
6809
6810 /*
6811  * Update the seqid of a lock stateid after receiving
6812  * NFS4ERR_OLD_STATEID
6813  */
6814 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6815                 struct nfs4_lock_state *lsp)
6816 {
6817         struct nfs4_state *state = lsp->ls_state;
6818         bool ret = false;
6819
6820         spin_lock(&state->state_lock);
6821         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6822                 goto out;
6823         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6824                 nfs4_stateid_seqid_inc(dst);
6825         else
6826                 dst->seqid = lsp->ls_stateid.seqid;
6827         ret = true;
6828 out:
6829         spin_unlock(&state->state_lock);
6830         return ret;
6831 }
6832
6833 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6834                 struct nfs4_lock_state *lsp)
6835 {
6836         struct nfs4_state *state = lsp->ls_state;
6837         bool ret;
6838
6839         spin_lock(&state->state_lock);
6840         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6841         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6842         spin_unlock(&state->state_lock);
6843         return ret;
6844 }
6845
6846 struct nfs4_unlockdata {
6847         struct nfs_locku_args arg;
6848         struct nfs_locku_res res;
6849         struct nfs4_lock_state *lsp;
6850         struct nfs_open_context *ctx;
6851         struct nfs_lock_context *l_ctx;
6852         struct file_lock fl;
6853         struct nfs_server *server;
6854         unsigned long timestamp;
6855 };
6856
6857 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6858                 struct nfs_open_context *ctx,
6859                 struct nfs4_lock_state *lsp,
6860                 struct nfs_seqid *seqid)
6861 {
6862         struct nfs4_unlockdata *p;
6863         struct nfs4_state *state = lsp->ls_state;
6864         struct inode *inode = state->inode;
6865
6866         p = kzalloc(sizeof(*p), GFP_KERNEL);
6867         if (p == NULL)
6868                 return NULL;
6869         p->arg.fh = NFS_FH(inode);
6870         p->arg.fl = &p->fl;
6871         p->arg.seqid = seqid;
6872         p->res.seqid = seqid;
6873         p->lsp = lsp;
6874         /* Ensure we don't close file until we're done freeing locks! */
6875         p->ctx = get_nfs_open_context(ctx);
6876         p->l_ctx = nfs_get_lock_context(ctx);
6877         locks_init_lock(&p->fl);
6878         locks_copy_lock(&p->fl, fl);
6879         p->server = NFS_SERVER(inode);
6880         spin_lock(&state->state_lock);
6881         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6882         spin_unlock(&state->state_lock);
6883         return p;
6884 }
6885
6886 static void nfs4_locku_release_calldata(void *data)
6887 {
6888         struct nfs4_unlockdata *calldata = data;
6889         nfs_free_seqid(calldata->arg.seqid);
6890         nfs4_put_lock_state(calldata->lsp);
6891         nfs_put_lock_context(calldata->l_ctx);
6892         put_nfs_open_context(calldata->ctx);
6893         kfree(calldata);
6894 }
6895
6896 static void nfs4_locku_done(struct rpc_task *task, void *data)
6897 {
6898         struct nfs4_unlockdata *calldata = data;
6899         struct nfs4_exception exception = {
6900                 .inode = calldata->lsp->ls_state->inode,
6901                 .stateid = &calldata->arg.stateid,
6902         };
6903
6904         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6905                 return;
6906         switch (task->tk_status) {
6907                 case 0:
6908                         renew_lease(calldata->server, calldata->timestamp);
6909                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6910                         if (nfs4_update_lock_stateid(calldata->lsp,
6911                                         &calldata->res.stateid))
6912                                 break;
6913                         fallthrough;
6914                 case -NFS4ERR_ADMIN_REVOKED:
6915                 case -NFS4ERR_EXPIRED:
6916                         nfs4_free_revoked_stateid(calldata->server,
6917                                         &calldata->arg.stateid,
6918                                         task->tk_msg.rpc_cred);
6919                         fallthrough;
6920                 case -NFS4ERR_BAD_STATEID:
6921                 case -NFS4ERR_STALE_STATEID:
6922                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6923                                                 calldata->lsp))
6924                                 rpc_restart_call_prepare(task);
6925                         break;
6926                 case -NFS4ERR_OLD_STATEID:
6927                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6928                                                 calldata->lsp))
6929                                 rpc_restart_call_prepare(task);
6930                         break;
6931                 default:
6932                         task->tk_status = nfs4_async_handle_exception(task,
6933                                         calldata->server, task->tk_status,
6934                                         &exception);
6935                         if (exception.retry)
6936                                 rpc_restart_call_prepare(task);
6937         }
6938         nfs_release_seqid(calldata->arg.seqid);
6939 }
6940
6941 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6942 {
6943         struct nfs4_unlockdata *calldata = data;
6944
6945         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6946                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6947                 return;
6948
6949         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6950                 goto out_wait;
6951         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6952                 /* Note: exit _without_ running nfs4_locku_done */
6953                 goto out_no_action;
6954         }
6955         calldata->timestamp = jiffies;
6956         if (nfs4_setup_sequence(calldata->server->nfs_client,
6957                                 &calldata->arg.seq_args,
6958                                 &calldata->res.seq_res,
6959                                 task) != 0)
6960                 nfs_release_seqid(calldata->arg.seqid);
6961         return;
6962 out_no_action:
6963         task->tk_action = NULL;
6964 out_wait:
6965         nfs4_sequence_done(task, &calldata->res.seq_res);
6966 }
6967
6968 static const struct rpc_call_ops nfs4_locku_ops = {
6969         .rpc_call_prepare = nfs4_locku_prepare,
6970         .rpc_call_done = nfs4_locku_done,
6971         .rpc_release = nfs4_locku_release_calldata,
6972 };
6973
6974 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6975                 struct nfs_open_context *ctx,
6976                 struct nfs4_lock_state *lsp,
6977                 struct nfs_seqid *seqid)
6978 {
6979         struct nfs4_unlockdata *data;
6980         struct rpc_message msg = {
6981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6982                 .rpc_cred = ctx->cred,
6983         };
6984         struct rpc_task_setup task_setup_data = {
6985                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6986                 .rpc_message = &msg,
6987                 .callback_ops = &nfs4_locku_ops,
6988                 .workqueue = nfsiod_workqueue,
6989                 .flags = RPC_TASK_ASYNC,
6990         };
6991
6992         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6993                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6994
6995         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6996                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6997
6998         /* Ensure this is an unlock - when canceling a lock, the
6999          * canceled lock is passed in, and it won't be an unlock.
7000          */
7001         fl->fl_type = F_UNLCK;
7002         if (fl->fl_flags & FL_CLOSE)
7003                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
7004
7005         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
7006         if (data == NULL) {
7007                 nfs_free_seqid(seqid);
7008                 return ERR_PTR(-ENOMEM);
7009         }
7010
7011         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7012         msg.rpc_argp = &data->arg;
7013         msg.rpc_resp = &data->res;
7014         task_setup_data.callback_data = data;
7015         return rpc_run_task(&task_setup_data);
7016 }
7017
7018 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7019 {
7020         struct inode *inode = state->inode;
7021         struct nfs4_state_owner *sp = state->owner;
7022         struct nfs_inode *nfsi = NFS_I(inode);
7023         struct nfs_seqid *seqid;
7024         struct nfs4_lock_state *lsp;
7025         struct rpc_task *task;
7026         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7027         int status = 0;
7028         unsigned char fl_flags = request->fl_flags;
7029
7030         status = nfs4_set_lock_state(state, request);
7031         /* Unlock _before_ we do the RPC call */
7032         request->fl_flags |= FL_EXISTS;
7033         /* Exclude nfs_delegation_claim_locks() */
7034         mutex_lock(&sp->so_delegreturn_mutex);
7035         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7036         down_read(&nfsi->rwsem);
7037         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7038                 up_read(&nfsi->rwsem);
7039                 mutex_unlock(&sp->so_delegreturn_mutex);
7040                 goto out;
7041         }
7042         up_read(&nfsi->rwsem);
7043         mutex_unlock(&sp->so_delegreturn_mutex);
7044         if (status != 0)
7045                 goto out;
7046         /* Is this a delegated lock? */
7047         lsp = request->fl_u.nfs4_fl.owner;
7048         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7049                 goto out;
7050         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7051         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7052         status = -ENOMEM;
7053         if (IS_ERR(seqid))
7054                 goto out;
7055         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7056         status = PTR_ERR(task);
7057         if (IS_ERR(task))
7058                 goto out;
7059         status = rpc_wait_for_completion_task(task);
7060         rpc_put_task(task);
7061 out:
7062         request->fl_flags = fl_flags;
7063         trace_nfs4_unlock(request, state, F_SETLK, status);
7064         return status;
7065 }
7066
7067 struct nfs4_lockdata {
7068         struct nfs_lock_args arg;
7069         struct nfs_lock_res res;
7070         struct nfs4_lock_state *lsp;
7071         struct nfs_open_context *ctx;
7072         struct file_lock fl;
7073         unsigned long timestamp;
7074         int rpc_status;
7075         int cancelled;
7076         struct nfs_server *server;
7077 };
7078
7079 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7080                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7081                 gfp_t gfp_mask)
7082 {
7083         struct nfs4_lockdata *p;
7084         struct inode *inode = lsp->ls_state->inode;
7085         struct nfs_server *server = NFS_SERVER(inode);
7086         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7087
7088         p = kzalloc(sizeof(*p), gfp_mask);
7089         if (p == NULL)
7090                 return NULL;
7091
7092         p->arg.fh = NFS_FH(inode);
7093         p->arg.fl = &p->fl;
7094         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7095         if (IS_ERR(p->arg.open_seqid))
7096                 goto out_free;
7097         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7098         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7099         if (IS_ERR(p->arg.lock_seqid))
7100                 goto out_free_seqid;
7101         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7102         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7103         p->arg.lock_owner.s_dev = server->s_dev;
7104         p->res.lock_seqid = p->arg.lock_seqid;
7105         p->lsp = lsp;
7106         p->server = server;
7107         p->ctx = get_nfs_open_context(ctx);
7108         locks_init_lock(&p->fl);
7109         locks_copy_lock(&p->fl, fl);
7110         return p;
7111 out_free_seqid:
7112         nfs_free_seqid(p->arg.open_seqid);
7113 out_free:
7114         kfree(p);
7115         return NULL;
7116 }
7117
7118 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7119 {
7120         struct nfs4_lockdata *data = calldata;
7121         struct nfs4_state *state = data->lsp->ls_state;
7122
7123         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7124                 goto out_wait;
7125         /* Do we need to do an open_to_lock_owner? */
7126         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7127                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7128                         goto out_release_lock_seqid;
7129                 }
7130                 nfs4_stateid_copy(&data->arg.open_stateid,
7131                                 &state->open_stateid);
7132                 data->arg.new_lock_owner = 1;
7133                 data->res.open_seqid = data->arg.open_seqid;
7134         } else {
7135                 data->arg.new_lock_owner = 0;
7136                 nfs4_stateid_copy(&data->arg.lock_stateid,
7137                                 &data->lsp->ls_stateid);
7138         }
7139         if (!nfs4_valid_open_stateid(state)) {
7140                 data->rpc_status = -EBADF;
7141                 task->tk_action = NULL;
7142                 goto out_release_open_seqid;
7143         }
7144         data->timestamp = jiffies;
7145         if (nfs4_setup_sequence(data->server->nfs_client,
7146                                 &data->arg.seq_args,
7147                                 &data->res.seq_res,
7148                                 task) == 0)
7149                 return;
7150 out_release_open_seqid:
7151         nfs_release_seqid(data->arg.open_seqid);
7152 out_release_lock_seqid:
7153         nfs_release_seqid(data->arg.lock_seqid);
7154 out_wait:
7155         nfs4_sequence_done(task, &data->res.seq_res);
7156         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7157 }
7158
7159 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7160 {
7161         struct nfs4_lockdata *data = calldata;
7162         struct nfs4_lock_state *lsp = data->lsp;
7163
7164         if (!nfs4_sequence_done(task, &data->res.seq_res))
7165                 return;
7166
7167         data->rpc_status = task->tk_status;
7168         switch (task->tk_status) {
7169         case 0:
7170                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
7171                                 data->timestamp);
7172                 if (data->arg.new_lock && !data->cancelled) {
7173                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7174                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7175                                 goto out_restart;
7176                 }
7177                 if (data->arg.new_lock_owner != 0) {
7178                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7179                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7180                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7181                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7182                         goto out_restart;
7183                 break;
7184         case -NFS4ERR_OLD_STATEID:
7185                 if (data->arg.new_lock_owner != 0 &&
7186                         nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
7187                                         lsp->ls_state))
7188                         goto out_restart;
7189                 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
7190                         goto out_restart;
7191                 fallthrough;
7192         case -NFS4ERR_BAD_STATEID:
7193         case -NFS4ERR_STALE_STATEID:
7194         case -NFS4ERR_EXPIRED:
7195                 if (data->arg.new_lock_owner != 0) {
7196                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7197                                                 &lsp->ls_state->open_stateid))
7198                                 goto out_restart;
7199                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7200                                                 &lsp->ls_stateid))
7201                                 goto out_restart;
7202         }
7203 out_done:
7204         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7205         return;
7206 out_restart:
7207         if (!data->cancelled)
7208                 rpc_restart_call_prepare(task);
7209         goto out_done;
7210 }
7211
7212 static void nfs4_lock_release(void *calldata)
7213 {
7214         struct nfs4_lockdata *data = calldata;
7215
7216         nfs_free_seqid(data->arg.open_seqid);
7217         if (data->cancelled && data->rpc_status == 0) {
7218                 struct rpc_task *task;
7219                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7220                                 data->arg.lock_seqid);
7221                 if (!IS_ERR(task))
7222                         rpc_put_task_async(task);
7223                 dprintk("%s: cancelling lock!\n", __func__);
7224         } else
7225                 nfs_free_seqid(data->arg.lock_seqid);
7226         nfs4_put_lock_state(data->lsp);
7227         put_nfs_open_context(data->ctx);
7228         kfree(data);
7229 }
7230
7231 static const struct rpc_call_ops nfs4_lock_ops = {
7232         .rpc_call_prepare = nfs4_lock_prepare,
7233         .rpc_call_done = nfs4_lock_done,
7234         .rpc_release = nfs4_lock_release,
7235 };
7236
7237 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7238 {
7239         switch (error) {
7240         case -NFS4ERR_ADMIN_REVOKED:
7241         case -NFS4ERR_EXPIRED:
7242         case -NFS4ERR_BAD_STATEID:
7243                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7244                 if (new_lock_owner != 0 ||
7245                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7246                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7247                 break;
7248         case -NFS4ERR_STALE_STATEID:
7249                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7250                 nfs4_schedule_lease_recovery(server->nfs_client);
7251         }
7252 }
7253
7254 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7255 {
7256         struct nfs4_lockdata *data;
7257         struct rpc_task *task;
7258         struct rpc_message msg = {
7259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7260                 .rpc_cred = state->owner->so_cred,
7261         };
7262         struct rpc_task_setup task_setup_data = {
7263                 .rpc_client = NFS_CLIENT(state->inode),
7264                 .rpc_message = &msg,
7265                 .callback_ops = &nfs4_lock_ops,
7266                 .workqueue = nfsiod_workqueue,
7267                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7268         };
7269         int ret;
7270
7271         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7272                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7273
7274         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7275                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7276         if (data == NULL)
7277                 return -ENOMEM;
7278         if (IS_SETLKW(cmd))
7279                 data->arg.block = 1;
7280         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7281                                 recovery_type > NFS_LOCK_NEW);
7282         msg.rpc_argp = &data->arg;
7283         msg.rpc_resp = &data->res;
7284         task_setup_data.callback_data = data;
7285         if (recovery_type > NFS_LOCK_NEW) {
7286                 if (recovery_type == NFS_LOCK_RECLAIM)
7287                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7288         } else
7289                 data->arg.new_lock = 1;
7290         task = rpc_run_task(&task_setup_data);
7291         if (IS_ERR(task))
7292                 return PTR_ERR(task);
7293         ret = rpc_wait_for_completion_task(task);
7294         if (ret == 0) {
7295                 ret = data->rpc_status;
7296                 if (ret)
7297                         nfs4_handle_setlk_error(data->server, data->lsp,
7298                                         data->arg.new_lock_owner, ret);
7299         } else
7300                 data->cancelled = true;
7301         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7302         rpc_put_task(task);
7303         dprintk("%s: ret = %d\n", __func__, ret);
7304         return ret;
7305 }
7306
7307 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7308 {
7309         struct nfs_server *server = NFS_SERVER(state->inode);
7310         struct nfs4_exception exception = {
7311                 .inode = state->inode,
7312         };
7313         int err;
7314
7315         do {
7316                 /* Cache the lock if possible... */
7317                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7318                         return 0;
7319                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7320                 if (err != -NFS4ERR_DELAY)
7321                         break;
7322                 nfs4_handle_exception(server, err, &exception);
7323         } while (exception.retry);
7324         return err;
7325 }
7326
7327 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7328 {
7329         struct nfs_server *server = NFS_SERVER(state->inode);
7330         struct nfs4_exception exception = {
7331                 .inode = state->inode,
7332         };
7333         int err;
7334
7335         err = nfs4_set_lock_state(state, request);
7336         if (err != 0)
7337                 return err;
7338         if (!recover_lost_locks) {
7339                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7340                 return 0;
7341         }
7342         do {
7343                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7344                         return 0;
7345                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7346                 switch (err) {
7347                 default:
7348                         goto out;
7349                 case -NFS4ERR_GRACE:
7350                 case -NFS4ERR_DELAY:
7351                         nfs4_handle_exception(server, err, &exception);
7352                         err = 0;
7353                 }
7354         } while (exception.retry);
7355 out:
7356         return err;
7357 }
7358
7359 #if defined(CONFIG_NFS_V4_1)
7360 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7361 {
7362         struct nfs4_lock_state *lsp;
7363         int status;
7364
7365         status = nfs4_set_lock_state(state, request);
7366         if (status != 0)
7367                 return status;
7368         lsp = request->fl_u.nfs4_fl.owner;
7369         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7370             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7371                 return 0;
7372         return nfs4_lock_expired(state, request);
7373 }
7374 #endif
7375
7376 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7377 {
7378         struct nfs_inode *nfsi = NFS_I(state->inode);
7379         struct nfs4_state_owner *sp = state->owner;
7380         unsigned char fl_flags = request->fl_flags;
7381         int status;
7382
7383         request->fl_flags |= FL_ACCESS;
7384         status = locks_lock_inode_wait(state->inode, request);
7385         if (status < 0)
7386                 goto out;
7387         mutex_lock(&sp->so_delegreturn_mutex);
7388         down_read(&nfsi->rwsem);
7389         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7390                 /* Yes: cache locks! */
7391                 /* ...but avoid races with delegation recall... */
7392                 request->fl_flags = fl_flags & ~FL_SLEEP;
7393                 status = locks_lock_inode_wait(state->inode, request);
7394                 up_read(&nfsi->rwsem);
7395                 mutex_unlock(&sp->so_delegreturn_mutex);
7396                 goto out;
7397         }
7398         up_read(&nfsi->rwsem);
7399         mutex_unlock(&sp->so_delegreturn_mutex);
7400         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7401 out:
7402         request->fl_flags = fl_flags;
7403         return status;
7404 }
7405
7406 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7407 {
7408         struct nfs4_exception exception = {
7409                 .state = state,
7410                 .inode = state->inode,
7411                 .interruptible = true,
7412         };
7413         int err;
7414
7415         do {
7416                 err = _nfs4_proc_setlk(state, cmd, request);
7417                 if (err == -NFS4ERR_DENIED)
7418                         err = -EAGAIN;
7419                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7420                                 err, &exception);
7421         } while (exception.retry);
7422         return err;
7423 }
7424
7425 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7426 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7427
7428 static int
7429 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7430                         struct file_lock *request)
7431 {
7432         int             status = -ERESTARTSYS;
7433         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7434
7435         while(!signalled()) {
7436                 status = nfs4_proc_setlk(state, cmd, request);
7437                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7438                         break;
7439                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7440                 schedule_timeout(timeout);
7441                 timeout *= 2;
7442                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7443                 status = -ERESTARTSYS;
7444         }
7445         return status;
7446 }
7447
7448 #ifdef CONFIG_NFS_V4_1
7449 struct nfs4_lock_waiter {
7450         struct inode            *inode;
7451         struct nfs_lowner       owner;
7452         wait_queue_entry_t      wait;
7453 };
7454
7455 static int
7456 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7457 {
7458         struct nfs4_lock_waiter *waiter =
7459                 container_of(wait, struct nfs4_lock_waiter, wait);
7460
7461         /* NULL key means to wake up everyone */
7462         if (key) {
7463                 struct cb_notify_lock_args      *cbnl = key;
7464                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7465                                                 *wowner = &waiter->owner;
7466
7467                 /* Only wake if the callback was for the same owner. */
7468                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7469                         return 0;
7470
7471                 /* Make sure it's for the right inode */
7472                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7473                         return 0;
7474         }
7475
7476         return woken_wake_function(wait, mode, flags, key);
7477 }
7478
7479 static int
7480 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7481 {
7482         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7483         struct nfs_server *server = NFS_SERVER(state->inode);
7484         struct nfs_client *clp = server->nfs_client;
7485         wait_queue_head_t *q = &clp->cl_lock_waitq;
7486         struct nfs4_lock_waiter waiter = {
7487                 .inode = state->inode,
7488                 .owner = { .clientid = clp->cl_clientid,
7489                            .id = lsp->ls_seqid.owner_id,
7490                            .s_dev = server->s_dev },
7491         };
7492         int status;
7493
7494         /* Don't bother with waitqueue if we don't expect a callback */
7495         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7496                 return nfs4_retry_setlk_simple(state, cmd, request);
7497
7498         init_wait(&waiter.wait);
7499         waiter.wait.func = nfs4_wake_lock_waiter;
7500         add_wait_queue(q, &waiter.wait);
7501
7502         do {
7503                 status = nfs4_proc_setlk(state, cmd, request);
7504                 if (status != -EAGAIN || IS_SETLK(cmd))
7505                         break;
7506
7507                 status = -ERESTARTSYS;
7508                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7509                            NFS4_LOCK_MAXTIMEOUT);
7510         } while (!signalled());
7511
7512         remove_wait_queue(q, &waiter.wait);
7513
7514         return status;
7515 }
7516 #else /* !CONFIG_NFS_V4_1 */
7517 static inline int
7518 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7519 {
7520         return nfs4_retry_setlk_simple(state, cmd, request);
7521 }
7522 #endif
7523
7524 static int
7525 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7526 {
7527         struct nfs_open_context *ctx;
7528         struct nfs4_state *state;
7529         int status;
7530
7531         /* verify open state */
7532         ctx = nfs_file_open_context(filp);
7533         state = ctx->state;
7534
7535         if (IS_GETLK(cmd)) {
7536                 if (state != NULL)
7537                         return nfs4_proc_getlk(state, F_GETLK, request);
7538                 return 0;
7539         }
7540
7541         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7542                 return -EINVAL;
7543
7544         if (request->fl_type == F_UNLCK) {
7545                 if (state != NULL)
7546                         return nfs4_proc_unlck(state, cmd, request);
7547                 return 0;
7548         }
7549
7550         if (state == NULL)
7551                 return -ENOLCK;
7552
7553         if ((request->fl_flags & FL_POSIX) &&
7554             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7555                 return -ENOLCK;
7556
7557         /*
7558          * Don't rely on the VFS having checked the file open mode,
7559          * since it won't do this for flock() locks.
7560          */
7561         switch (request->fl_type) {
7562         case F_RDLCK:
7563                 if (!(filp->f_mode & FMODE_READ))
7564                         return -EBADF;
7565                 break;
7566         case F_WRLCK:
7567                 if (!(filp->f_mode & FMODE_WRITE))
7568                         return -EBADF;
7569         }
7570
7571         status = nfs4_set_lock_state(state, request);
7572         if (status != 0)
7573                 return status;
7574
7575         return nfs4_retry_setlk(state, cmd, request);
7576 }
7577
7578 static int nfs4_delete_lease(struct file *file, void **priv)
7579 {
7580         return generic_setlease(file, F_UNLCK, NULL, priv);
7581 }
7582
7583 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
7584                           void **priv)
7585 {
7586         struct inode *inode = file_inode(file);
7587         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7588         int ret;
7589
7590         /* No delegation, no lease */
7591         if (!nfs4_have_delegation(inode, type))
7592                 return -EAGAIN;
7593         ret = generic_setlease(file, arg, lease, priv);
7594         if (ret || nfs4_have_delegation(inode, type))
7595                 return ret;
7596         /* We raced with a delegation return */
7597         nfs4_delete_lease(file, priv);
7598         return -EAGAIN;
7599 }
7600
7601 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
7602                        void **priv)
7603 {
7604         switch (arg) {
7605         case F_RDLCK:
7606         case F_WRLCK:
7607                 return nfs4_add_lease(file, arg, lease, priv);
7608         case F_UNLCK:
7609                 return nfs4_delete_lease(file, priv);
7610         default:
7611                 return -EINVAL;
7612         }
7613 }
7614
7615 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7616 {
7617         struct nfs_server *server = NFS_SERVER(state->inode);
7618         int err;
7619
7620         err = nfs4_set_lock_state(state, fl);
7621         if (err != 0)
7622                 return err;
7623         do {
7624                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7625                 if (err != -NFS4ERR_DELAY)
7626                         break;
7627                 ssleep(1);
7628         } while (err == -NFS4ERR_DELAY);
7629         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7630 }
7631
7632 struct nfs_release_lockowner_data {
7633         struct nfs4_lock_state *lsp;
7634         struct nfs_server *server;
7635         struct nfs_release_lockowner_args args;
7636         struct nfs_release_lockowner_res res;
7637         unsigned long timestamp;
7638 };
7639
7640 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7641 {
7642         struct nfs_release_lockowner_data *data = calldata;
7643         struct nfs_server *server = data->server;
7644         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7645                            &data->res.seq_res, task);
7646         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7647         data->timestamp = jiffies;
7648 }
7649
7650 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7651 {
7652         struct nfs_release_lockowner_data *data = calldata;
7653         struct nfs_server *server = data->server;
7654
7655         nfs40_sequence_done(task, &data->res.seq_res);
7656
7657         switch (task->tk_status) {
7658         case 0:
7659                 renew_lease(server, data->timestamp);
7660                 break;
7661         case -NFS4ERR_STALE_CLIENTID:
7662         case -NFS4ERR_EXPIRED:
7663                 nfs4_schedule_lease_recovery(server->nfs_client);
7664                 break;
7665         case -NFS4ERR_LEASE_MOVED:
7666         case -NFS4ERR_DELAY:
7667                 if (nfs4_async_handle_error(task, server,
7668                                             NULL, NULL) == -EAGAIN)
7669                         rpc_restart_call_prepare(task);
7670         }
7671 }
7672
7673 static void nfs4_release_lockowner_release(void *calldata)
7674 {
7675         struct nfs_release_lockowner_data *data = calldata;
7676         nfs4_free_lock_state(data->server, data->lsp);
7677         kfree(calldata);
7678 }
7679
7680 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7681         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7682         .rpc_call_done = nfs4_release_lockowner_done,
7683         .rpc_release = nfs4_release_lockowner_release,
7684 };
7685
7686 static void
7687 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7688 {
7689         struct nfs_release_lockowner_data *data;
7690         struct rpc_message msg = {
7691                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7692         };
7693
7694         if (server->nfs_client->cl_mvops->minor_version != 0)
7695                 return;
7696
7697         data = kmalloc(sizeof(*data), GFP_KERNEL);
7698         if (!data)
7699                 return;
7700         data->lsp = lsp;
7701         data->server = server;
7702         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7703         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7704         data->args.lock_owner.s_dev = server->s_dev;
7705
7706         msg.rpc_argp = &data->args;
7707         msg.rpc_resp = &data->res;
7708         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7709         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7710 }
7711
7712 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7713
7714 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7715                                    struct user_namespace *mnt_userns,
7716                                    struct dentry *unused, struct inode *inode,
7717                                    const char *key, const void *buf,
7718                                    size_t buflen, int flags)
7719 {
7720         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7721 }
7722
7723 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7724                                    struct dentry *unused, struct inode *inode,
7725                                    const char *key, void *buf, size_t buflen)
7726 {
7727         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7728 }
7729
7730 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7731 {
7732         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7733 }
7734
7735 #if defined(CONFIG_NFS_V4_1)
7736 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7737
7738 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7739                                     struct user_namespace *mnt_userns,
7740                                     struct dentry *unused, struct inode *inode,
7741                                     const char *key, const void *buf,
7742                                     size_t buflen, int flags)
7743 {
7744         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7745 }
7746
7747 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7748                                     struct dentry *unused, struct inode *inode,
7749                                     const char *key, void *buf, size_t buflen)
7750 {
7751         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7752 }
7753
7754 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7755 {
7756         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7757 }
7758
7759 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7760
7761 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7762                                     struct user_namespace *mnt_userns,
7763                                     struct dentry *unused, struct inode *inode,
7764                                     const char *key, const void *buf,
7765                                     size_t buflen, int flags)
7766 {
7767         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7768 }
7769
7770 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7771                                     struct dentry *unused, struct inode *inode,
7772                                     const char *key, void *buf, size_t buflen)
7773 {
7774         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7775 }
7776
7777 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7778 {
7779         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7780 }
7781
7782 #endif
7783
7784 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7785
7786 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7787                                      struct user_namespace *mnt_userns,
7788                                      struct dentry *unused, struct inode *inode,
7789                                      const char *key, const void *buf,
7790                                      size_t buflen, int flags)
7791 {
7792         if (security_ismaclabel(key))
7793                 return nfs4_set_security_label(inode, buf, buflen);
7794
7795         return -EOPNOTSUPP;
7796 }
7797
7798 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7799                                      struct dentry *unused, struct inode *inode,
7800                                      const char *key, void *buf, size_t buflen)
7801 {
7802         if (security_ismaclabel(key))
7803                 return nfs4_get_security_label(inode, buf, buflen);
7804         return -EOPNOTSUPP;
7805 }
7806
7807 static ssize_t
7808 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7809 {
7810         int len = 0;
7811
7812         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7813                 len = security_inode_listsecurity(inode, list, list_len);
7814                 if (len >= 0 && list_len && len > list_len)
7815                         return -ERANGE;
7816         }
7817         return len;
7818 }
7819
7820 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7821         .prefix = XATTR_SECURITY_PREFIX,
7822         .get    = nfs4_xattr_get_nfs4_label,
7823         .set    = nfs4_xattr_set_nfs4_label,
7824 };
7825
7826 #else
7827
7828 static ssize_t
7829 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7830 {
7831         return 0;
7832 }
7833
7834 #endif
7835
7836 #ifdef CONFIG_NFS_V4_2
7837 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7838                                     struct user_namespace *mnt_userns,
7839                                     struct dentry *unused, struct inode *inode,
7840                                     const char *key, const void *buf,
7841                                     size_t buflen, int flags)
7842 {
7843         u32 mask;
7844         int ret;
7845
7846         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7847                 return -EOPNOTSUPP;
7848
7849         /*
7850          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7851          * flags right now. Handling of xattr operations use the normal
7852          * file read/write permissions.
7853          *
7854          * Just in case the server has other ideas (which RFC 8276 allows),
7855          * do a cached access check for the XA* flags to possibly avoid
7856          * doing an RPC and getting EACCES back.
7857          */
7858         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7859                 if (!(mask & NFS_ACCESS_XAWRITE))
7860                         return -EACCES;
7861         }
7862
7863         if (buf == NULL) {
7864                 ret = nfs42_proc_removexattr(inode, key);
7865                 if (!ret)
7866                         nfs4_xattr_cache_remove(inode, key);
7867         } else {
7868                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7869                 if (!ret)
7870                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7871         }
7872
7873         return ret;
7874 }
7875
7876 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7877                                     struct dentry *unused, struct inode *inode,
7878                                     const char *key, void *buf, size_t buflen)
7879 {
7880         u32 mask;
7881         ssize_t ret;
7882
7883         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7884                 return -EOPNOTSUPP;
7885
7886         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7887                 if (!(mask & NFS_ACCESS_XAREAD))
7888                         return -EACCES;
7889         }
7890
7891         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7892         if (ret)
7893                 return ret;
7894
7895         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7896         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7897                 return ret;
7898
7899         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7900
7901         return ret;
7902 }
7903
7904 static ssize_t
7905 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7906 {
7907         u64 cookie;
7908         bool eof;
7909         ssize_t ret, size;
7910         char *buf;
7911         size_t buflen;
7912         u32 mask;
7913
7914         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7915                 return 0;
7916
7917         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7918                 if (!(mask & NFS_ACCESS_XALIST))
7919                         return 0;
7920         }
7921
7922         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7923         if (ret)
7924                 return ret;
7925
7926         ret = nfs4_xattr_cache_list(inode, list, list_len);
7927         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7928                 return ret;
7929
7930         cookie = 0;
7931         eof = false;
7932         buflen = list_len ? list_len : XATTR_LIST_MAX;
7933         buf = list_len ? list : NULL;
7934         size = 0;
7935
7936         while (!eof) {
7937                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7938                     &cookie, &eof);
7939                 if (ret < 0)
7940                         return ret;
7941
7942                 if (list_len) {
7943                         buf += ret;
7944                         buflen -= ret;
7945                 }
7946                 size += ret;
7947         }
7948
7949         if (list_len)
7950                 nfs4_xattr_cache_set_list(inode, list, size);
7951
7952         return size;
7953 }
7954
7955 #else
7956
7957 static ssize_t
7958 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7959 {
7960         return 0;
7961 }
7962 #endif /* CONFIG_NFS_V4_2 */
7963
7964 /*
7965  * nfs_fhget will use either the mounted_on_fileid or the fileid
7966  */
7967 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7968 {
7969         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7970                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7971               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7972               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7973                 return;
7974
7975         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7976                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7977         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7978         fattr->nlink = 2;
7979 }
7980
7981 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7982                                    const struct qstr *name,
7983                                    struct nfs4_fs_locations *fs_locations,
7984                                    struct page *page)
7985 {
7986         struct nfs_server *server = NFS_SERVER(dir);
7987         u32 bitmask[3];
7988         struct nfs4_fs_locations_arg args = {
7989                 .dir_fh = NFS_FH(dir),
7990                 .name = name,
7991                 .page = page,
7992                 .bitmask = bitmask,
7993         };
7994         struct nfs4_fs_locations_res res = {
7995                 .fs_locations = fs_locations,
7996         };
7997         struct rpc_message msg = {
7998                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7999                 .rpc_argp = &args,
8000                 .rpc_resp = &res,
8001         };
8002         int status;
8003
8004         dprintk("%s: start\n", __func__);
8005
8006         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
8007         bitmask[1] = nfs4_fattr_bitmap[1];
8008
8009         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
8010          * is not supported */
8011         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
8012                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
8013         else
8014                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8015
8016         nfs_fattr_init(fs_locations->fattr);
8017         fs_locations->server = server;
8018         fs_locations->nlocations = 0;
8019         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8020         dprintk("%s: returned status = %d\n", __func__, status);
8021         return status;
8022 }
8023
8024 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8025                            const struct qstr *name,
8026                            struct nfs4_fs_locations *fs_locations,
8027                            struct page *page)
8028 {
8029         struct nfs4_exception exception = {
8030                 .interruptible = true,
8031         };
8032         int err;
8033         do {
8034                 err = _nfs4_proc_fs_locations(client, dir, name,
8035                                 fs_locations, page);
8036                 trace_nfs4_get_fs_locations(dir, name, err);
8037                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8038                                 &exception);
8039         } while (exception.retry);
8040         return err;
8041 }
8042
8043 /*
8044  * This operation also signals the server that this client is
8045  * performing migration recovery.  The server can stop returning
8046  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8047  * appended to this compound to identify the client ID which is
8048  * performing recovery.
8049  */
8050 static int _nfs40_proc_get_locations(struct nfs_server *server,
8051                                      struct nfs_fh *fhandle,
8052                                      struct nfs4_fs_locations *locations,
8053                                      struct page *page, const struct cred *cred)
8054 {
8055         struct rpc_clnt *clnt = server->client;
8056         u32 bitmask[2] = {
8057                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8058         };
8059         struct nfs4_fs_locations_arg args = {
8060                 .clientid       = server->nfs_client->cl_clientid,
8061                 .fh             = fhandle,
8062                 .page           = page,
8063                 .bitmask        = bitmask,
8064                 .migration      = 1,            /* skip LOOKUP */
8065                 .renew          = 1,            /* append RENEW */
8066         };
8067         struct nfs4_fs_locations_res res = {
8068                 .fs_locations   = locations,
8069                 .migration      = 1,
8070                 .renew          = 1,
8071         };
8072         struct rpc_message msg = {
8073                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8074                 .rpc_argp       = &args,
8075                 .rpc_resp       = &res,
8076                 .rpc_cred       = cred,
8077         };
8078         unsigned long now = jiffies;
8079         int status;
8080
8081         nfs_fattr_init(locations->fattr);
8082         locations->server = server;
8083         locations->nlocations = 0;
8084
8085         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8086         status = nfs4_call_sync_sequence(clnt, server, &msg,
8087                                         &args.seq_args, &res.seq_res);
8088         if (status)
8089                 return status;
8090
8091         renew_lease(server, now);
8092         return 0;
8093 }
8094
8095 #ifdef CONFIG_NFS_V4_1
8096
8097 /*
8098  * This operation also signals the server that this client is
8099  * performing migration recovery.  The server can stop asserting
8100  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8101  * performing this operation is identified in the SEQUENCE
8102  * operation in this compound.
8103  *
8104  * When the client supports GETATTR(fs_locations_info), it can
8105  * be plumbed in here.
8106  */
8107 static int _nfs41_proc_get_locations(struct nfs_server *server,
8108                                      struct nfs_fh *fhandle,
8109                                      struct nfs4_fs_locations *locations,
8110                                      struct page *page, const struct cred *cred)
8111 {
8112         struct rpc_clnt *clnt = server->client;
8113         u32 bitmask[2] = {
8114                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8115         };
8116         struct nfs4_fs_locations_arg args = {
8117                 .fh             = fhandle,
8118                 .page           = page,
8119                 .bitmask        = bitmask,
8120                 .migration      = 1,            /* skip LOOKUP */
8121         };
8122         struct nfs4_fs_locations_res res = {
8123                 .fs_locations   = locations,
8124                 .migration      = 1,
8125         };
8126         struct rpc_message msg = {
8127                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8128                 .rpc_argp       = &args,
8129                 .rpc_resp       = &res,
8130                 .rpc_cred       = cred,
8131         };
8132         struct nfs4_call_sync_data data = {
8133                 .seq_server = server,
8134                 .seq_args = &args.seq_args,
8135                 .seq_res = &res.seq_res,
8136         };
8137         struct rpc_task_setup task_setup_data = {
8138                 .rpc_client = clnt,
8139                 .rpc_message = &msg,
8140                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8141                 .callback_data = &data,
8142                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8143         };
8144         int status;
8145
8146         nfs_fattr_init(locations->fattr);
8147         locations->server = server;
8148         locations->nlocations = 0;
8149
8150         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8151         status = nfs4_call_sync_custom(&task_setup_data);
8152         if (status == NFS4_OK &&
8153             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8154                 status = -NFS4ERR_LEASE_MOVED;
8155         return status;
8156 }
8157
8158 #endif  /* CONFIG_NFS_V4_1 */
8159
8160 /**
8161  * nfs4_proc_get_locations - discover locations for a migrated FSID
8162  * @server: pointer to nfs_server to process
8163  * @fhandle: pointer to the kernel NFS client file handle
8164  * @locations: result of query
8165  * @page: buffer
8166  * @cred: credential to use for this operation
8167  *
8168  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8169  * operation failed, or a negative errno if a local error occurred.
8170  *
8171  * On success, "locations" is filled in, but if the server has
8172  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8173  * asserted.
8174  *
8175  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8176  * from this client that require migration recovery.
8177  */
8178 int nfs4_proc_get_locations(struct nfs_server *server,
8179                             struct nfs_fh *fhandle,
8180                             struct nfs4_fs_locations *locations,
8181                             struct page *page, const struct cred *cred)
8182 {
8183         struct nfs_client *clp = server->nfs_client;
8184         const struct nfs4_mig_recovery_ops *ops =
8185                                         clp->cl_mvops->mig_recovery_ops;
8186         struct nfs4_exception exception = {
8187                 .interruptible = true,
8188         };
8189         int status;
8190
8191         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8192                 (unsigned long long)server->fsid.major,
8193                 (unsigned long long)server->fsid.minor,
8194                 clp->cl_hostname);
8195         nfs_display_fhandle(fhandle, __func__);
8196
8197         do {
8198                 status = ops->get_locations(server, fhandle, locations, page,
8199                                             cred);
8200                 if (status != -NFS4ERR_DELAY)
8201                         break;
8202                 nfs4_handle_exception(server, status, &exception);
8203         } while (exception.retry);
8204         return status;
8205 }
8206
8207 /*
8208  * This operation also signals the server that this client is
8209  * performing "lease moved" recovery.  The server can stop
8210  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8211  * is appended to this compound to identify the client ID which is
8212  * performing recovery.
8213  */
8214 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8215 {
8216         struct nfs_server *server = NFS_SERVER(inode);
8217         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8218         struct rpc_clnt *clnt = server->client;
8219         struct nfs4_fsid_present_arg args = {
8220                 .fh             = NFS_FH(inode),
8221                 .clientid       = clp->cl_clientid,
8222                 .renew          = 1,            /* append RENEW */
8223         };
8224         struct nfs4_fsid_present_res res = {
8225                 .renew          = 1,
8226         };
8227         struct rpc_message msg = {
8228                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8229                 .rpc_argp       = &args,
8230                 .rpc_resp       = &res,
8231                 .rpc_cred       = cred,
8232         };
8233         unsigned long now = jiffies;
8234         int status;
8235
8236         res.fh = nfs_alloc_fhandle();
8237         if (res.fh == NULL)
8238                 return -ENOMEM;
8239
8240         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8241         status = nfs4_call_sync_sequence(clnt, server, &msg,
8242                                                 &args.seq_args, &res.seq_res);
8243         nfs_free_fhandle(res.fh);
8244         if (status)
8245                 return status;
8246
8247         do_renew_lease(clp, now);
8248         return 0;
8249 }
8250
8251 #ifdef CONFIG_NFS_V4_1
8252
8253 /*
8254  * This operation also signals the server that this client is
8255  * performing "lease moved" recovery.  The server can stop asserting
8256  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8257  * this operation is identified in the SEQUENCE operation in this
8258  * compound.
8259  */
8260 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8261 {
8262         struct nfs_server *server = NFS_SERVER(inode);
8263         struct rpc_clnt *clnt = server->client;
8264         struct nfs4_fsid_present_arg args = {
8265                 .fh             = NFS_FH(inode),
8266         };
8267         struct nfs4_fsid_present_res res = {
8268         };
8269         struct rpc_message msg = {
8270                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8271                 .rpc_argp       = &args,
8272                 .rpc_resp       = &res,
8273                 .rpc_cred       = cred,
8274         };
8275         int status;
8276
8277         res.fh = nfs_alloc_fhandle();
8278         if (res.fh == NULL)
8279                 return -ENOMEM;
8280
8281         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8282         status = nfs4_call_sync_sequence(clnt, server, &msg,
8283                                                 &args.seq_args, &res.seq_res);
8284         nfs_free_fhandle(res.fh);
8285         if (status == NFS4_OK &&
8286             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8287                 status = -NFS4ERR_LEASE_MOVED;
8288         return status;
8289 }
8290
8291 #endif  /* CONFIG_NFS_V4_1 */
8292
8293 /**
8294  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8295  * @inode: inode on FSID to check
8296  * @cred: credential to use for this operation
8297  *
8298  * Server indicates whether the FSID is present, moved, or not
8299  * recognized.  This operation is necessary to clear a LEASE_MOVED
8300  * condition for this client ID.
8301  *
8302  * Returns NFS4_OK if the FSID is present on this server,
8303  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8304  *  NFS4ERR code if some error occurred on the server, or a
8305  *  negative errno if a local failure occurred.
8306  */
8307 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8308 {
8309         struct nfs_server *server = NFS_SERVER(inode);
8310         struct nfs_client *clp = server->nfs_client;
8311         const struct nfs4_mig_recovery_ops *ops =
8312                                         clp->cl_mvops->mig_recovery_ops;
8313         struct nfs4_exception exception = {
8314                 .interruptible = true,
8315         };
8316         int status;
8317
8318         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8319                 (unsigned long long)server->fsid.major,
8320                 (unsigned long long)server->fsid.minor,
8321                 clp->cl_hostname);
8322         nfs_display_fhandle(NFS_FH(inode), __func__);
8323
8324         do {
8325                 status = ops->fsid_present(inode, cred);
8326                 if (status != -NFS4ERR_DELAY)
8327                         break;
8328                 nfs4_handle_exception(server, status, &exception);
8329         } while (exception.retry);
8330         return status;
8331 }
8332
8333 /*
8334  * If 'use_integrity' is true and the state managment nfs_client
8335  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8336  * and the machine credential as per RFC3530bis and RFC5661 Security
8337  * Considerations sections. Otherwise, just use the user cred with the
8338  * filesystem's rpc_client.
8339  */
8340 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8341 {
8342         int status;
8343         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8344         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8345         struct nfs4_secinfo_arg args = {
8346                 .dir_fh = NFS_FH(dir),
8347                 .name   = name,
8348         };
8349         struct nfs4_secinfo_res res = {
8350                 .flavors     = flavors,
8351         };
8352         struct rpc_message msg = {
8353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8354                 .rpc_argp = &args,
8355                 .rpc_resp = &res,
8356         };
8357         struct nfs4_call_sync_data data = {
8358                 .seq_server = NFS_SERVER(dir),
8359                 .seq_args = &args.seq_args,
8360                 .seq_res = &res.seq_res,
8361         };
8362         struct rpc_task_setup task_setup = {
8363                 .rpc_client = clnt,
8364                 .rpc_message = &msg,
8365                 .callback_ops = clp->cl_mvops->call_sync_ops,
8366                 .callback_data = &data,
8367                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8368         };
8369         const struct cred *cred = NULL;
8370
8371         if (use_integrity) {
8372                 clnt = clp->cl_rpcclient;
8373                 task_setup.rpc_client = clnt;
8374
8375                 cred = nfs4_get_clid_cred(clp);
8376                 msg.rpc_cred = cred;
8377         }
8378
8379         dprintk("NFS call  secinfo %s\n", name->name);
8380
8381         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8382         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8383         status = nfs4_call_sync_custom(&task_setup);
8384
8385         dprintk("NFS reply  secinfo: %d\n", status);
8386
8387         put_cred(cred);
8388         return status;
8389 }
8390
8391 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8392                       struct nfs4_secinfo_flavors *flavors)
8393 {
8394         struct nfs4_exception exception = {
8395                 .interruptible = true,
8396         };
8397         int err;
8398         do {
8399                 err = -NFS4ERR_WRONGSEC;
8400
8401                 /* try to use integrity protection with machine cred */
8402                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8403                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8404
8405                 /*
8406                  * if unable to use integrity protection, or SECINFO with
8407                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8408                  * disallowed by spec, but exists in deployed servers) use
8409                  * the current filesystem's rpc_client and the user cred.
8410                  */
8411                 if (err == -NFS4ERR_WRONGSEC)
8412                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8413
8414                 trace_nfs4_secinfo(dir, name, err);
8415                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8416                                 &exception);
8417         } while (exception.retry);
8418         return err;
8419 }
8420
8421 #ifdef CONFIG_NFS_V4_1
8422 /*
8423  * Check the exchange flags returned by the server for invalid flags, having
8424  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8425  * DS flags set.
8426  */
8427 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8428 {
8429         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8430                 goto out_inval;
8431         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8432                 goto out_inval;
8433         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8434             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8435                 goto out_inval;
8436         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8437                 goto out_inval;
8438         return NFS_OK;
8439 out_inval:
8440         return -NFS4ERR_INVAL;
8441 }
8442
8443 static bool
8444 nfs41_same_server_scope(struct nfs41_server_scope *a,
8445                         struct nfs41_server_scope *b)
8446 {
8447         if (a->server_scope_sz != b->server_scope_sz)
8448                 return false;
8449         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8450 }
8451
8452 static void
8453 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8454 {
8455         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8456         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8457         struct nfs_client *clp = args->client;
8458
8459         switch (task->tk_status) {
8460         case -NFS4ERR_BADSESSION:
8461         case -NFS4ERR_DEADSESSION:
8462                 nfs4_schedule_session_recovery(clp->cl_session,
8463                                 task->tk_status);
8464                 return;
8465         }
8466         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8467                         res->dir != NFS4_CDFS4_BOTH) {
8468                 rpc_task_close_connection(task);
8469                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8470                         rpc_restart_call(task);
8471         }
8472 }
8473
8474 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8475         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8476 };
8477
8478 /*
8479  * nfs4_proc_bind_one_conn_to_session()
8480  *
8481  * The 4.1 client currently uses the same TCP connection for the
8482  * fore and backchannel.
8483  */
8484 static
8485 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8486                 struct rpc_xprt *xprt,
8487                 struct nfs_client *clp,
8488                 const struct cred *cred)
8489 {
8490         int status;
8491         struct nfs41_bind_conn_to_session_args args = {
8492                 .client = clp,
8493                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8494                 .retries = 0,
8495         };
8496         struct nfs41_bind_conn_to_session_res res;
8497         struct rpc_message msg = {
8498                 .rpc_proc =
8499                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8500                 .rpc_argp = &args,
8501                 .rpc_resp = &res,
8502                 .rpc_cred = cred,
8503         };
8504         struct rpc_task_setup task_setup_data = {
8505                 .rpc_client = clnt,
8506                 .rpc_xprt = xprt,
8507                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8508                 .rpc_message = &msg,
8509                 .flags = RPC_TASK_TIMEOUT,
8510         };
8511         struct rpc_task *task;
8512
8513         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8514         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8515                 args.dir = NFS4_CDFC4_FORE;
8516
8517         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8518         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8519                 args.dir = NFS4_CDFC4_FORE;
8520
8521         task = rpc_run_task(&task_setup_data);
8522         if (!IS_ERR(task)) {
8523                 status = task->tk_status;
8524                 rpc_put_task(task);
8525         } else
8526                 status = PTR_ERR(task);
8527         trace_nfs4_bind_conn_to_session(clp, status);
8528         if (status == 0) {
8529                 if (memcmp(res.sessionid.data,
8530                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8531                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8532                         return -EIO;
8533                 }
8534                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8535                         dprintk("NFS: %s: Unexpected direction from server\n",
8536                                 __func__);
8537                         return -EIO;
8538                 }
8539                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8540                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8541                                 __func__);
8542                         return -EIO;
8543                 }
8544         }
8545
8546         return status;
8547 }
8548
8549 struct rpc_bind_conn_calldata {
8550         struct nfs_client *clp;
8551         const struct cred *cred;
8552 };
8553
8554 static int
8555 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8556                 struct rpc_xprt *xprt,
8557                 void *calldata)
8558 {
8559         struct rpc_bind_conn_calldata *p = calldata;
8560
8561         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8562 }
8563
8564 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8565 {
8566         struct rpc_bind_conn_calldata data = {
8567                 .clp = clp,
8568                 .cred = cred,
8569         };
8570         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8571                         nfs4_proc_bind_conn_to_session_callback, &data);
8572 }
8573
8574 /*
8575  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8576  * and operations we'd like to see to enable certain features in the allow map
8577  */
8578 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8579         .how = SP4_MACH_CRED,
8580         .enforce.u.words = {
8581                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8582                       1 << (OP_EXCHANGE_ID - 32) |
8583                       1 << (OP_CREATE_SESSION - 32) |
8584                       1 << (OP_DESTROY_SESSION - 32) |
8585                       1 << (OP_DESTROY_CLIENTID - 32)
8586         },
8587         .allow.u.words = {
8588                 [0] = 1 << (OP_CLOSE) |
8589                       1 << (OP_OPEN_DOWNGRADE) |
8590                       1 << (OP_LOCKU) |
8591                       1 << (OP_DELEGRETURN) |
8592                       1 << (OP_COMMIT),
8593                 [1] = 1 << (OP_SECINFO - 32) |
8594                       1 << (OP_SECINFO_NO_NAME - 32) |
8595                       1 << (OP_LAYOUTRETURN - 32) |
8596                       1 << (OP_TEST_STATEID - 32) |
8597                       1 << (OP_FREE_STATEID - 32) |
8598                       1 << (OP_WRITE - 32)
8599         }
8600 };
8601
8602 /*
8603  * Select the state protection mode for client `clp' given the server results
8604  * from exchange_id in `sp'.
8605  *
8606  * Returns 0 on success, negative errno otherwise.
8607  */
8608 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8609                                  struct nfs41_state_protection *sp)
8610 {
8611         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8612                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8613                       1 << (OP_EXCHANGE_ID - 32) |
8614                       1 << (OP_CREATE_SESSION - 32) |
8615                       1 << (OP_DESTROY_SESSION - 32) |
8616                       1 << (OP_DESTROY_CLIENTID - 32)
8617         };
8618         unsigned long flags = 0;
8619         unsigned int i;
8620         int ret = 0;
8621
8622         if (sp->how == SP4_MACH_CRED) {
8623                 /* Print state protect result */
8624                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8625                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8626                         if (test_bit(i, sp->enforce.u.longs))
8627                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8628                         if (test_bit(i, sp->allow.u.longs))
8629                                 dfprintk(MOUNT, "  allow op %d\n", i);
8630                 }
8631
8632                 /* make sure nothing is on enforce list that isn't supported */
8633                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8634                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8635                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8636                                 ret = -EINVAL;
8637                                 goto out;
8638                         }
8639                 }
8640
8641                 /*
8642                  * Minimal mode - state operations are allowed to use machine
8643                  * credential.  Note this already happens by default, so the
8644                  * client doesn't have to do anything more than the negotiation.
8645                  *
8646                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8647                  *       we're already using the machine cred for exchange_id
8648                  *       and will never use a different cred.
8649                  */
8650                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8651                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8652                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8653                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8654                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8655                         dfprintk(MOUNT, "  minimal mode enabled\n");
8656                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8657                 } else {
8658                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8659                         ret = -EINVAL;
8660                         goto out;
8661                 }
8662
8663                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8664                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8665                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8666                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8667                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8668                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8669                 }
8670
8671                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8672                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8673                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8674                 }
8675
8676                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8677                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8678                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8679                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8680                 }
8681
8682                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8683                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8684                         dfprintk(MOUNT, "  stateid mode enabled\n");
8685                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8686                 }
8687
8688                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8689                         dfprintk(MOUNT, "  write mode enabled\n");
8690                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8691                 }
8692
8693                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8694                         dfprintk(MOUNT, "  commit mode enabled\n");
8695                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8696                 }
8697         }
8698 out:
8699         clp->cl_sp4_flags = flags;
8700         return ret;
8701 }
8702
8703 struct nfs41_exchange_id_data {
8704         struct nfs41_exchange_id_res res;
8705         struct nfs41_exchange_id_args args;
8706 };
8707
8708 static void nfs4_exchange_id_release(void *data)
8709 {
8710         struct nfs41_exchange_id_data *cdata =
8711                                         (struct nfs41_exchange_id_data *)data;
8712
8713         nfs_put_client(cdata->args.client);
8714         kfree(cdata->res.impl_id);
8715         kfree(cdata->res.server_scope);
8716         kfree(cdata->res.server_owner);
8717         kfree(cdata);
8718 }
8719
8720 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8721         .rpc_release = nfs4_exchange_id_release,
8722 };
8723
8724 /*
8725  * _nfs4_proc_exchange_id()
8726  *
8727  * Wrapper for EXCHANGE_ID operation.
8728  */
8729 static struct rpc_task *
8730 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8731                         u32 sp4_how, struct rpc_xprt *xprt)
8732 {
8733         struct rpc_message msg = {
8734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8735                 .rpc_cred = cred,
8736         };
8737         struct rpc_task_setup task_setup_data = {
8738                 .rpc_client = clp->cl_rpcclient,
8739                 .callback_ops = &nfs4_exchange_id_call_ops,
8740                 .rpc_message = &msg,
8741                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8742         };
8743         struct nfs41_exchange_id_data *calldata;
8744         int status;
8745
8746         if (!refcount_inc_not_zero(&clp->cl_count))
8747                 return ERR_PTR(-EIO);
8748
8749         status = -ENOMEM;
8750         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8751         if (!calldata)
8752                 goto out;
8753
8754         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8755
8756         status = nfs4_init_uniform_client_string(clp);
8757         if (status)
8758                 goto out_calldata;
8759
8760         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8761                                                 GFP_NOFS);
8762         status = -ENOMEM;
8763         if (unlikely(calldata->res.server_owner == NULL))
8764                 goto out_calldata;
8765
8766         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8767                                         GFP_NOFS);
8768         if (unlikely(calldata->res.server_scope == NULL))
8769                 goto out_server_owner;
8770
8771         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8772         if (unlikely(calldata->res.impl_id == NULL))
8773                 goto out_server_scope;
8774
8775         switch (sp4_how) {
8776         case SP4_NONE:
8777                 calldata->args.state_protect.how = SP4_NONE;
8778                 break;
8779
8780         case SP4_MACH_CRED:
8781                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8782                 break;
8783
8784         default:
8785                 /* unsupported! */
8786                 WARN_ON_ONCE(1);
8787                 status = -EINVAL;
8788                 goto out_impl_id;
8789         }
8790         if (xprt) {
8791                 task_setup_data.rpc_xprt = xprt;
8792                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8793                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8794                                 sizeof(calldata->args.verifier.data));
8795         }
8796         calldata->args.client = clp;
8797         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8798         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8799 #ifdef CONFIG_NFS_V4_1_MIGRATION
8800         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8801 #endif
8802         if (test_bit(NFS_CS_DS, &clp->cl_flags))
8803                 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
8804         msg.rpc_argp = &calldata->args;
8805         msg.rpc_resp = &calldata->res;
8806         task_setup_data.callback_data = calldata;
8807
8808         return rpc_run_task(&task_setup_data);
8809
8810 out_impl_id:
8811         kfree(calldata->res.impl_id);
8812 out_server_scope:
8813         kfree(calldata->res.server_scope);
8814 out_server_owner:
8815         kfree(calldata->res.server_owner);
8816 out_calldata:
8817         kfree(calldata);
8818 out:
8819         nfs_put_client(clp);
8820         return ERR_PTR(status);
8821 }
8822
8823 /*
8824  * _nfs4_proc_exchange_id()
8825  *
8826  * Wrapper for EXCHANGE_ID operation.
8827  */
8828 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8829                         u32 sp4_how)
8830 {
8831         struct rpc_task *task;
8832         struct nfs41_exchange_id_args *argp;
8833         struct nfs41_exchange_id_res *resp;
8834         unsigned long now = jiffies;
8835         int status;
8836
8837         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8838         if (IS_ERR(task))
8839                 return PTR_ERR(task);
8840
8841         argp = task->tk_msg.rpc_argp;
8842         resp = task->tk_msg.rpc_resp;
8843         status = task->tk_status;
8844         if (status  != 0)
8845                 goto out;
8846
8847         status = nfs4_check_cl_exchange_flags(resp->flags,
8848                         clp->cl_mvops->minor_version);
8849         if (status  != 0)
8850                 goto out;
8851
8852         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8853         if (status != 0)
8854                 goto out;
8855
8856         do_renew_lease(clp, now);
8857
8858         clp->cl_clientid = resp->clientid;
8859         clp->cl_exchange_flags = resp->flags;
8860         clp->cl_seqid = resp->seqid;
8861         /* Client ID is not confirmed */
8862         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8863                 clear_bit(NFS4_SESSION_ESTABLISHED,
8864                           &clp->cl_session->session_state);
8865
8866         if (clp->cl_serverscope != NULL &&
8867             !nfs41_same_server_scope(clp->cl_serverscope,
8868                                 resp->server_scope)) {
8869                 dprintk("%s: server_scope mismatch detected\n",
8870                         __func__);
8871                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8872         }
8873
8874         swap(clp->cl_serverowner, resp->server_owner);
8875         swap(clp->cl_serverscope, resp->server_scope);
8876         swap(clp->cl_implid, resp->impl_id);
8877
8878         /* Save the EXCHANGE_ID verifier session trunk tests */
8879         memcpy(clp->cl_confirm.data, argp->verifier.data,
8880                sizeof(clp->cl_confirm.data));
8881 out:
8882         trace_nfs4_exchange_id(clp, status);
8883         rpc_put_task(task);
8884         return status;
8885 }
8886
8887 /*
8888  * nfs4_proc_exchange_id()
8889  *
8890  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8891  *
8892  * Since the clientid has expired, all compounds using sessions
8893  * associated with the stale clientid will be returning
8894  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8895  * be in some phase of session reset.
8896  *
8897  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8898  */
8899 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8900 {
8901         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8902         int status;
8903
8904         /* try SP4_MACH_CRED if krb5i/p */
8905         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8906             authflavor == RPC_AUTH_GSS_KRB5P) {
8907                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8908                 if (!status)
8909                         return 0;
8910         }
8911
8912         /* try SP4_NONE */
8913         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8914 }
8915
8916 /**
8917  * nfs4_test_session_trunk
8918  *
8919  * This is an add_xprt_test() test function called from
8920  * rpc_clnt_setup_test_and_add_xprt.
8921  *
8922  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8923  * and is dereferrenced in nfs4_exchange_id_release
8924  *
8925  * Upon success, add the new transport to the rpc_clnt
8926  *
8927  * @clnt: struct rpc_clnt to get new transport
8928  * @xprt: the rpc_xprt to test
8929  * @data: call data for _nfs4_proc_exchange_id.
8930  */
8931 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8932                             void *data)
8933 {
8934         struct nfs4_add_xprt_data *adata = data;
8935         struct rpc_task *task;
8936         int status;
8937
8938         u32 sp4_how;
8939
8940         dprintk("--> %s try %s\n", __func__,
8941                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8942
8943         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8944
8945 try_again:
8946         /* Test connection for session trunking. Async exchange_id call */
8947         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8948         if (IS_ERR(task))
8949                 return;
8950
8951         status = task->tk_status;
8952         if (status == 0)
8953                 status = nfs4_detect_session_trunking(adata->clp,
8954                                 task->tk_msg.rpc_resp, xprt);
8955
8956         if (status == 0)
8957                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8958         else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
8959                                 (struct sockaddr *)&xprt->addr))
8960                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8961
8962         rpc_put_task(task);
8963         if (status == -NFS4ERR_DELAY) {
8964                 ssleep(1);
8965                 goto try_again;
8966         }
8967 }
8968 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8969
8970 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8971                 const struct cred *cred)
8972 {
8973         struct rpc_message msg = {
8974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8975                 .rpc_argp = clp,
8976                 .rpc_cred = cred,
8977         };
8978         int status;
8979
8980         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8981                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8982         trace_nfs4_destroy_clientid(clp, status);
8983         if (status)
8984                 dprintk("NFS: Got error %d from the server %s on "
8985                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8986         return status;
8987 }
8988
8989 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8990                 const struct cred *cred)
8991 {
8992         unsigned int loop;
8993         int ret;
8994
8995         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8996                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8997                 switch (ret) {
8998                 case -NFS4ERR_DELAY:
8999                 case -NFS4ERR_CLIENTID_BUSY:
9000                         ssleep(1);
9001                         break;
9002                 default:
9003                         return ret;
9004                 }
9005         }
9006         return 0;
9007 }
9008
9009 int nfs4_destroy_clientid(struct nfs_client *clp)
9010 {
9011         const struct cred *cred;
9012         int ret = 0;
9013
9014         if (clp->cl_mvops->minor_version < 1)
9015                 goto out;
9016         if (clp->cl_exchange_flags == 0)
9017                 goto out;
9018         if (clp->cl_preserve_clid)
9019                 goto out;
9020         cred = nfs4_get_clid_cred(clp);
9021         ret = nfs4_proc_destroy_clientid(clp, cred);
9022         put_cred(cred);
9023         switch (ret) {
9024         case 0:
9025         case -NFS4ERR_STALE_CLIENTID:
9026                 clp->cl_exchange_flags = 0;
9027         }
9028 out:
9029         return ret;
9030 }
9031
9032 #endif /* CONFIG_NFS_V4_1 */
9033
9034 struct nfs4_get_lease_time_data {
9035         struct nfs4_get_lease_time_args *args;
9036         struct nfs4_get_lease_time_res *res;
9037         struct nfs_client *clp;
9038 };
9039
9040 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9041                                         void *calldata)
9042 {
9043         struct nfs4_get_lease_time_data *data =
9044                         (struct nfs4_get_lease_time_data *)calldata;
9045
9046         /* just setup sequence, do not trigger session recovery
9047            since we're invoked within one */
9048         nfs4_setup_sequence(data->clp,
9049                         &data->args->la_seq_args,
9050                         &data->res->lr_seq_res,
9051                         task);
9052 }
9053
9054 /*
9055  * Called from nfs4_state_manager thread for session setup, so don't recover
9056  * from sequence operation or clientid errors.
9057  */
9058 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9059 {
9060         struct nfs4_get_lease_time_data *data =
9061                         (struct nfs4_get_lease_time_data *)calldata;
9062
9063         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9064                 return;
9065         switch (task->tk_status) {
9066         case -NFS4ERR_DELAY:
9067         case -NFS4ERR_GRACE:
9068                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9069                 task->tk_status = 0;
9070                 fallthrough;
9071         case -NFS4ERR_RETRY_UNCACHED_REP:
9072                 rpc_restart_call_prepare(task);
9073                 return;
9074         }
9075 }
9076
9077 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9078         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9079         .rpc_call_done = nfs4_get_lease_time_done,
9080 };
9081
9082 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9083 {
9084         struct nfs4_get_lease_time_args args;
9085         struct nfs4_get_lease_time_res res = {
9086                 .lr_fsinfo = fsinfo,
9087         };
9088         struct nfs4_get_lease_time_data data = {
9089                 .args = &args,
9090                 .res = &res,
9091                 .clp = clp,
9092         };
9093         struct rpc_message msg = {
9094                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9095                 .rpc_argp = &args,
9096                 .rpc_resp = &res,
9097         };
9098         struct rpc_task_setup task_setup = {
9099                 .rpc_client = clp->cl_rpcclient,
9100                 .rpc_message = &msg,
9101                 .callback_ops = &nfs4_get_lease_time_ops,
9102                 .callback_data = &data,
9103                 .flags = RPC_TASK_TIMEOUT,
9104         };
9105
9106         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9107         return nfs4_call_sync_custom(&task_setup);
9108 }
9109
9110 #ifdef CONFIG_NFS_V4_1
9111
9112 /*
9113  * Initialize the values to be used by the client in CREATE_SESSION
9114  * If nfs4_init_session set the fore channel request and response sizes,
9115  * use them.
9116  *
9117  * Set the back channel max_resp_sz_cached to zero to force the client to
9118  * always set csa_cachethis to FALSE because the current implementation
9119  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9120  */
9121 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9122                                     struct rpc_clnt *clnt)
9123 {
9124         unsigned int max_rqst_sz, max_resp_sz;
9125         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9126         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9127
9128         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9129         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9130
9131         /* Fore channel attributes */
9132         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9133         args->fc_attrs.max_resp_sz = max_resp_sz;
9134         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9135         args->fc_attrs.max_reqs = max_session_slots;
9136
9137         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9138                 "max_ops=%u max_reqs=%u\n",
9139                 __func__,
9140                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9141                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9142
9143         /* Back channel attributes */
9144         args->bc_attrs.max_rqst_sz = max_bc_payload;
9145         args->bc_attrs.max_resp_sz = max_bc_payload;
9146         args->bc_attrs.max_resp_sz_cached = 0;
9147         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9148         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9149         if (args->bc_attrs.max_reqs > max_bc_slots)
9150                 args->bc_attrs.max_reqs = max_bc_slots;
9151
9152         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9153                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9154                 __func__,
9155                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9156                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9157                 args->bc_attrs.max_reqs);
9158 }
9159
9160 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9161                 struct nfs41_create_session_res *res)
9162 {
9163         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9164         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9165
9166         if (rcvd->max_resp_sz > sent->max_resp_sz)
9167                 return -EINVAL;
9168         /*
9169          * Our requested max_ops is the minimum we need; we're not
9170          * prepared to break up compounds into smaller pieces than that.
9171          * So, no point even trying to continue if the server won't
9172          * cooperate:
9173          */
9174         if (rcvd->max_ops < sent->max_ops)
9175                 return -EINVAL;
9176         if (rcvd->max_reqs == 0)
9177                 return -EINVAL;
9178         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9179                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9180         return 0;
9181 }
9182
9183 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9184                 struct nfs41_create_session_res *res)
9185 {
9186         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9187         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9188
9189         if (!(res->flags & SESSION4_BACK_CHAN))
9190                 goto out;
9191         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9192                 return -EINVAL;
9193         if (rcvd->max_resp_sz < sent->max_resp_sz)
9194                 return -EINVAL;
9195         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9196                 return -EINVAL;
9197         if (rcvd->max_ops > sent->max_ops)
9198                 return -EINVAL;
9199         if (rcvd->max_reqs > sent->max_reqs)
9200                 return -EINVAL;
9201 out:
9202         return 0;
9203 }
9204
9205 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9206                                      struct nfs41_create_session_res *res)
9207 {
9208         int ret;
9209
9210         ret = nfs4_verify_fore_channel_attrs(args, res);
9211         if (ret)
9212                 return ret;
9213         return nfs4_verify_back_channel_attrs(args, res);
9214 }
9215
9216 static void nfs4_update_session(struct nfs4_session *session,
9217                 struct nfs41_create_session_res *res)
9218 {
9219         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9220         /* Mark client id and session as being confirmed */
9221         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9222         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9223         session->flags = res->flags;
9224         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9225         if (res->flags & SESSION4_BACK_CHAN)
9226                 memcpy(&session->bc_attrs, &res->bc_attrs,
9227                                 sizeof(session->bc_attrs));
9228 }
9229
9230 static int _nfs4_proc_create_session(struct nfs_client *clp,
9231                 const struct cred *cred)
9232 {
9233         struct nfs4_session *session = clp->cl_session;
9234         struct nfs41_create_session_args args = {
9235                 .client = clp,
9236                 .clientid = clp->cl_clientid,
9237                 .seqid = clp->cl_seqid,
9238                 .cb_program = NFS4_CALLBACK,
9239         };
9240         struct nfs41_create_session_res res;
9241
9242         struct rpc_message msg = {
9243                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9244                 .rpc_argp = &args,
9245                 .rpc_resp = &res,
9246                 .rpc_cred = cred,
9247         };
9248         int status;
9249
9250         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9251         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9252
9253         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9254                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9255         trace_nfs4_create_session(clp, status);
9256
9257         switch (status) {
9258         case -NFS4ERR_STALE_CLIENTID:
9259         case -NFS4ERR_DELAY:
9260         case -ETIMEDOUT:
9261         case -EACCES:
9262         case -EAGAIN:
9263                 goto out;
9264         }
9265
9266         clp->cl_seqid++;
9267         if (!status) {
9268                 /* Verify the session's negotiated channel_attrs values */
9269                 status = nfs4_verify_channel_attrs(&args, &res);
9270                 /* Increment the clientid slot sequence id */
9271                 if (status)
9272                         goto out;
9273                 nfs4_update_session(session, &res);
9274         }
9275 out:
9276         return status;
9277 }
9278
9279 /*
9280  * Issues a CREATE_SESSION operation to the server.
9281  * It is the responsibility of the caller to verify the session is
9282  * expired before calling this routine.
9283  */
9284 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9285 {
9286         int status;
9287         unsigned *ptr;
9288         struct nfs4_session *session = clp->cl_session;
9289         struct nfs4_add_xprt_data xprtdata = {
9290                 .clp = clp,
9291         };
9292         struct rpc_add_xprt_test rpcdata = {
9293                 .add_xprt_test = clp->cl_mvops->session_trunk,
9294                 .data = &xprtdata,
9295         };
9296
9297         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9298
9299         status = _nfs4_proc_create_session(clp, cred);
9300         if (status)
9301                 goto out;
9302
9303         /* Init or reset the session slot tables */
9304         status = nfs4_setup_session_slot_tables(session);
9305         dprintk("slot table setup returned %d\n", status);
9306         if (status)
9307                 goto out;
9308
9309         ptr = (unsigned *)&session->sess_id.data[0];
9310         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9311                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9312         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9313 out:
9314         return status;
9315 }
9316
9317 /*
9318  * Issue the over-the-wire RPC DESTROY_SESSION.
9319  * The caller must serialize access to this routine.
9320  */
9321 int nfs4_proc_destroy_session(struct nfs4_session *session,
9322                 const struct cred *cred)
9323 {
9324         struct rpc_message msg = {
9325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9326                 .rpc_argp = session,
9327                 .rpc_cred = cred,
9328         };
9329         int status = 0;
9330
9331         /* session is still being setup */
9332         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9333                 return 0;
9334
9335         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9336                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9337         trace_nfs4_destroy_session(session->clp, status);
9338
9339         if (status)
9340                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9341                         "Session has been destroyed regardless...\n", status);
9342         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9343         return status;
9344 }
9345
9346 /*
9347  * Renew the cl_session lease.
9348  */
9349 struct nfs4_sequence_data {
9350         struct nfs_client *clp;
9351         struct nfs4_sequence_args args;
9352         struct nfs4_sequence_res res;
9353 };
9354
9355 static void nfs41_sequence_release(void *data)
9356 {
9357         struct nfs4_sequence_data *calldata = data;
9358         struct nfs_client *clp = calldata->clp;
9359
9360         if (refcount_read(&clp->cl_count) > 1)
9361                 nfs4_schedule_state_renewal(clp);
9362         nfs_put_client(clp);
9363         kfree(calldata);
9364 }
9365
9366 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9367 {
9368         switch(task->tk_status) {
9369         case -NFS4ERR_DELAY:
9370                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9371                 return -EAGAIN;
9372         default:
9373                 nfs4_schedule_lease_recovery(clp);
9374         }
9375         return 0;
9376 }
9377
9378 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9379 {
9380         struct nfs4_sequence_data *calldata = data;
9381         struct nfs_client *clp = calldata->clp;
9382
9383         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9384                 return;
9385
9386         trace_nfs4_sequence(clp, task->tk_status);
9387         if (task->tk_status < 0) {
9388                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9389                 if (refcount_read(&clp->cl_count) == 1)
9390                         return;
9391
9392                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9393                         rpc_restart_call_prepare(task);
9394                         return;
9395                 }
9396         }
9397         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9398 }
9399
9400 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9401 {
9402         struct nfs4_sequence_data *calldata = data;
9403         struct nfs_client *clp = calldata->clp;
9404         struct nfs4_sequence_args *args;
9405         struct nfs4_sequence_res *res;
9406
9407         args = task->tk_msg.rpc_argp;
9408         res = task->tk_msg.rpc_resp;
9409
9410         nfs4_setup_sequence(clp, args, res, task);
9411 }
9412
9413 static const struct rpc_call_ops nfs41_sequence_ops = {
9414         .rpc_call_done = nfs41_sequence_call_done,
9415         .rpc_call_prepare = nfs41_sequence_prepare,
9416         .rpc_release = nfs41_sequence_release,
9417 };
9418
9419 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9420                 const struct cred *cred,
9421                 struct nfs4_slot *slot,
9422                 bool is_privileged)
9423 {
9424         struct nfs4_sequence_data *calldata;
9425         struct rpc_message msg = {
9426                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9427                 .rpc_cred = cred,
9428         };
9429         struct rpc_task_setup task_setup_data = {
9430                 .rpc_client = clp->cl_rpcclient,
9431                 .rpc_message = &msg,
9432                 .callback_ops = &nfs41_sequence_ops,
9433                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9434         };
9435         struct rpc_task *ret;
9436
9437         ret = ERR_PTR(-EIO);
9438         if (!refcount_inc_not_zero(&clp->cl_count))
9439                 goto out_err;
9440
9441         ret = ERR_PTR(-ENOMEM);
9442         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9443         if (calldata == NULL)
9444                 goto out_put_clp;
9445         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9446         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9447         msg.rpc_argp = &calldata->args;
9448         msg.rpc_resp = &calldata->res;
9449         calldata->clp = clp;
9450         task_setup_data.callback_data = calldata;
9451
9452         ret = rpc_run_task(&task_setup_data);
9453         if (IS_ERR(ret))
9454                 goto out_err;
9455         return ret;
9456 out_put_clp:
9457         nfs_put_client(clp);
9458 out_err:
9459         nfs41_release_slot(slot);
9460         return ret;
9461 }
9462
9463 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9464 {
9465         struct rpc_task *task;
9466         int ret = 0;
9467
9468         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9469                 return -EAGAIN;
9470         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9471         if (IS_ERR(task))
9472                 ret = PTR_ERR(task);
9473         else
9474                 rpc_put_task_async(task);
9475         dprintk("<-- %s status=%d\n", __func__, ret);
9476         return ret;
9477 }
9478
9479 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9480 {
9481         struct rpc_task *task;
9482         int ret;
9483
9484         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9485         if (IS_ERR(task)) {
9486                 ret = PTR_ERR(task);
9487                 goto out;
9488         }
9489         ret = rpc_wait_for_completion_task(task);
9490         if (!ret)
9491                 ret = task->tk_status;
9492         rpc_put_task(task);
9493 out:
9494         dprintk("<-- %s status=%d\n", __func__, ret);
9495         return ret;
9496 }
9497
9498 struct nfs4_reclaim_complete_data {
9499         struct nfs_client *clp;
9500         struct nfs41_reclaim_complete_args arg;
9501         struct nfs41_reclaim_complete_res res;
9502 };
9503
9504 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9505 {
9506         struct nfs4_reclaim_complete_data *calldata = data;
9507
9508         nfs4_setup_sequence(calldata->clp,
9509                         &calldata->arg.seq_args,
9510                         &calldata->res.seq_res,
9511                         task);
9512 }
9513
9514 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9515 {
9516         switch(task->tk_status) {
9517         case 0:
9518                 wake_up_all(&clp->cl_lock_waitq);
9519                 fallthrough;
9520         case -NFS4ERR_COMPLETE_ALREADY:
9521         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9522                 break;
9523         case -NFS4ERR_DELAY:
9524                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9525                 fallthrough;
9526         case -NFS4ERR_RETRY_UNCACHED_REP:
9527         case -EACCES:
9528                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9529                         __func__, task->tk_status, clp->cl_hostname);
9530                 return -EAGAIN;
9531         case -NFS4ERR_BADSESSION:
9532         case -NFS4ERR_DEADSESSION:
9533         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9534                 break;
9535         default:
9536                 nfs4_schedule_lease_recovery(clp);
9537         }
9538         return 0;
9539 }
9540
9541 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9542 {
9543         struct nfs4_reclaim_complete_data *calldata = data;
9544         struct nfs_client *clp = calldata->clp;
9545         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9546
9547         if (!nfs41_sequence_done(task, res))
9548                 return;
9549
9550         trace_nfs4_reclaim_complete(clp, task->tk_status);
9551         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9552                 rpc_restart_call_prepare(task);
9553                 return;
9554         }
9555 }
9556
9557 static void nfs4_free_reclaim_complete_data(void *data)
9558 {
9559         struct nfs4_reclaim_complete_data *calldata = data;
9560
9561         kfree(calldata);
9562 }
9563
9564 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9565         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9566         .rpc_call_done = nfs4_reclaim_complete_done,
9567         .rpc_release = nfs4_free_reclaim_complete_data,
9568 };
9569
9570 /*
9571  * Issue a global reclaim complete.
9572  */
9573 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9574                 const struct cred *cred)
9575 {
9576         struct nfs4_reclaim_complete_data *calldata;
9577         struct rpc_message msg = {
9578                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9579                 .rpc_cred = cred,
9580         };
9581         struct rpc_task_setup task_setup_data = {
9582                 .rpc_client = clp->cl_rpcclient,
9583                 .rpc_message = &msg,
9584                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9585                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9586         };
9587         int status = -ENOMEM;
9588
9589         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9590         if (calldata == NULL)
9591                 goto out;
9592         calldata->clp = clp;
9593         calldata->arg.one_fs = 0;
9594
9595         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9596         msg.rpc_argp = &calldata->arg;
9597         msg.rpc_resp = &calldata->res;
9598         task_setup_data.callback_data = calldata;
9599         status = nfs4_call_sync_custom(&task_setup_data);
9600 out:
9601         dprintk("<-- %s status=%d\n", __func__, status);
9602         return status;
9603 }
9604
9605 static void
9606 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9607 {
9608         struct nfs4_layoutget *lgp = calldata;
9609         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9610
9611         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9612                                 &lgp->res.seq_res, task);
9613 }
9614
9615 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9616 {
9617         struct nfs4_layoutget *lgp = calldata;
9618
9619         nfs41_sequence_process(task, &lgp->res.seq_res);
9620 }
9621
9622 static int
9623 nfs4_layoutget_handle_exception(struct rpc_task *task,
9624                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9625 {
9626         struct inode *inode = lgp->args.inode;
9627         struct nfs_server *server = NFS_SERVER(inode);
9628         struct pnfs_layout_hdr *lo = lgp->lo;
9629         int nfs4err = task->tk_status;
9630         int err, status = 0;
9631         LIST_HEAD(head);
9632
9633         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9634
9635         nfs4_sequence_free_slot(&lgp->res.seq_res);
9636
9637         switch (nfs4err) {
9638         case 0:
9639                 goto out;
9640
9641         /*
9642          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9643          * on the file. set tk_status to -ENODATA to tell upper layer to
9644          * retry go inband.
9645          */
9646         case -NFS4ERR_LAYOUTUNAVAILABLE:
9647                 status = -ENODATA;
9648                 goto out;
9649         /*
9650          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9651          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9652          */
9653         case -NFS4ERR_BADLAYOUT:
9654                 status = -EOVERFLOW;
9655                 goto out;
9656         /*
9657          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9658          * (or clients) writing to the same RAID stripe except when
9659          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9660          *
9661          * Treat it like we would RECALLCONFLICT -- we retry for a little
9662          * while, and then eventually give up.
9663          */
9664         case -NFS4ERR_LAYOUTTRYLATER:
9665                 if (lgp->args.minlength == 0) {
9666                         status = -EOVERFLOW;
9667                         goto out;
9668                 }
9669                 status = -EBUSY;
9670                 break;
9671         case -NFS4ERR_RECALLCONFLICT:
9672         case -NFS4ERR_RETURNCONFLICT:
9673                 status = -ERECALLCONFLICT;
9674                 break;
9675         case -NFS4ERR_DELEG_REVOKED:
9676         case -NFS4ERR_ADMIN_REVOKED:
9677         case -NFS4ERR_EXPIRED:
9678         case -NFS4ERR_BAD_STATEID:
9679                 exception->timeout = 0;
9680                 spin_lock(&inode->i_lock);
9681                 /* If the open stateid was bad, then recover it. */
9682                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9683                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9684                         spin_unlock(&inode->i_lock);
9685                         exception->state = lgp->args.ctx->state;
9686                         exception->stateid = &lgp->args.stateid;
9687                         break;
9688                 }
9689
9690                 /*
9691                  * Mark the bad layout state as invalid, then retry
9692                  */
9693                 pnfs_mark_layout_stateid_invalid(lo, &head);
9694                 spin_unlock(&inode->i_lock);
9695                 nfs_commit_inode(inode, 0);
9696                 pnfs_free_lseg_list(&head);
9697                 status = -EAGAIN;
9698                 goto out;
9699         }
9700
9701         err = nfs4_handle_exception(server, nfs4err, exception);
9702         if (!status) {
9703                 if (exception->retry)
9704                         status = -EAGAIN;
9705                 else
9706                         status = err;
9707         }
9708 out:
9709         return status;
9710 }
9711
9712 size_t max_response_pages(struct nfs_server *server)
9713 {
9714         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9715         return nfs_page_array_len(0, max_resp_sz);
9716 }
9717
9718 static void nfs4_layoutget_release(void *calldata)
9719 {
9720         struct nfs4_layoutget *lgp = calldata;
9721
9722         nfs4_sequence_free_slot(&lgp->res.seq_res);
9723         pnfs_layoutget_free(lgp);
9724 }
9725
9726 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9727         .rpc_call_prepare = nfs4_layoutget_prepare,
9728         .rpc_call_done = nfs4_layoutget_done,
9729         .rpc_release = nfs4_layoutget_release,
9730 };
9731
9732 struct pnfs_layout_segment *
9733 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9734 {
9735         struct inode *inode = lgp->args.inode;
9736         struct nfs_server *server = NFS_SERVER(inode);
9737         struct rpc_task *task;
9738         struct rpc_message msg = {
9739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9740                 .rpc_argp = &lgp->args,
9741                 .rpc_resp = &lgp->res,
9742                 .rpc_cred = lgp->cred,
9743         };
9744         struct rpc_task_setup task_setup_data = {
9745                 .rpc_client = server->client,
9746                 .rpc_message = &msg,
9747                 .callback_ops = &nfs4_layoutget_call_ops,
9748                 .callback_data = lgp,
9749                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9750                          RPC_TASK_MOVEABLE,
9751         };
9752         struct pnfs_layout_segment *lseg = NULL;
9753         struct nfs4_exception exception = {
9754                 .inode = inode,
9755                 .timeout = *timeout,
9756         };
9757         int status = 0;
9758
9759         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9760
9761         task = rpc_run_task(&task_setup_data);
9762         if (IS_ERR(task))
9763                 return ERR_CAST(task);
9764
9765         status = rpc_wait_for_completion_task(task);
9766         if (status != 0)
9767                 goto out;
9768
9769         if (task->tk_status < 0) {
9770                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9771                 *timeout = exception.timeout;
9772         } else if (lgp->res.layoutp->len == 0) {
9773                 status = -EAGAIN;
9774                 *timeout = nfs4_update_delay(&exception.timeout);
9775         } else
9776                 lseg = pnfs_layout_process(lgp);
9777 out:
9778         trace_nfs4_layoutget(lgp->args.ctx,
9779                         &lgp->args.range,
9780                         &lgp->res.range,
9781                         &lgp->res.stateid,
9782                         status);
9783
9784         rpc_put_task(task);
9785         dprintk("<-- %s status=%d\n", __func__, status);
9786         if (status)
9787                 return ERR_PTR(status);
9788         return lseg;
9789 }
9790
9791 static void
9792 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9793 {
9794         struct nfs4_layoutreturn *lrp = calldata;
9795
9796         nfs4_setup_sequence(lrp->clp,
9797                         &lrp->args.seq_args,
9798                         &lrp->res.seq_res,
9799                         task);
9800         if (!pnfs_layout_is_valid(lrp->args.layout))
9801                 rpc_exit(task, 0);
9802 }
9803
9804 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9805 {
9806         struct nfs4_layoutreturn *lrp = calldata;
9807         struct nfs_server *server;
9808
9809         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9810                 return;
9811
9812         /*
9813          * Was there an RPC level error? Assume the call succeeded,
9814          * and that we need to release the layout
9815          */
9816         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9817                 lrp->res.lrs_present = 0;
9818                 return;
9819         }
9820
9821         server = NFS_SERVER(lrp->args.inode);
9822         switch (task->tk_status) {
9823         case -NFS4ERR_OLD_STATEID:
9824                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9825                                         &lrp->args.range,
9826                                         lrp->args.inode))
9827                         goto out_restart;
9828                 fallthrough;
9829         default:
9830                 task->tk_status = 0;
9831                 fallthrough;
9832         case 0:
9833                 break;
9834         case -NFS4ERR_DELAY:
9835                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9836                         break;
9837                 goto out_restart;
9838         }
9839         return;
9840 out_restart:
9841         task->tk_status = 0;
9842         nfs4_sequence_free_slot(&lrp->res.seq_res);
9843         rpc_restart_call_prepare(task);
9844 }
9845
9846 static void nfs4_layoutreturn_release(void *calldata)
9847 {
9848         struct nfs4_layoutreturn *lrp = calldata;
9849         struct pnfs_layout_hdr *lo = lrp->args.layout;
9850
9851         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9852                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9853         nfs4_sequence_free_slot(&lrp->res.seq_res);
9854         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9855                 lrp->ld_private.ops->free(&lrp->ld_private);
9856         pnfs_put_layout_hdr(lrp->args.layout);
9857         nfs_iput_and_deactive(lrp->inode);
9858         put_cred(lrp->cred);
9859         kfree(calldata);
9860 }
9861
9862 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9863         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9864         .rpc_call_done = nfs4_layoutreturn_done,
9865         .rpc_release = nfs4_layoutreturn_release,
9866 };
9867
9868 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9869 {
9870         struct rpc_task *task;
9871         struct rpc_message msg = {
9872                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9873                 .rpc_argp = &lrp->args,
9874                 .rpc_resp = &lrp->res,
9875                 .rpc_cred = lrp->cred,
9876         };
9877         struct rpc_task_setup task_setup_data = {
9878                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9879                 .rpc_message = &msg,
9880                 .callback_ops = &nfs4_layoutreturn_call_ops,
9881                 .callback_data = lrp,
9882                 .flags = RPC_TASK_MOVEABLE,
9883         };
9884         int status = 0;
9885
9886         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9887                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9888                         &task_setup_data.rpc_client, &msg);
9889
9890         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9891         if (!sync) {
9892                 if (!lrp->inode) {
9893                         nfs4_layoutreturn_release(lrp);
9894                         return -EAGAIN;
9895                 }
9896                 task_setup_data.flags |= RPC_TASK_ASYNC;
9897         }
9898         if (!lrp->inode)
9899                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9900                                    1);
9901         else
9902                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9903                                    0);
9904         task = rpc_run_task(&task_setup_data);
9905         if (IS_ERR(task))
9906                 return PTR_ERR(task);
9907         if (sync)
9908                 status = task->tk_status;
9909         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9910         dprintk("<-- %s status=%d\n", __func__, status);
9911         rpc_put_task(task);
9912         return status;
9913 }
9914
9915 static int
9916 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9917                 struct pnfs_device *pdev,
9918                 const struct cred *cred)
9919 {
9920         struct nfs4_getdeviceinfo_args args = {
9921                 .pdev = pdev,
9922                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9923                         NOTIFY_DEVICEID4_DELETE,
9924         };
9925         struct nfs4_getdeviceinfo_res res = {
9926                 .pdev = pdev,
9927         };
9928         struct rpc_message msg = {
9929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9930                 .rpc_argp = &args,
9931                 .rpc_resp = &res,
9932                 .rpc_cred = cred,
9933         };
9934         int status;
9935
9936         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9937         if (res.notification & ~args.notify_types)
9938                 dprintk("%s: unsupported notification\n", __func__);
9939         if (res.notification != args.notify_types)
9940                 pdev->nocache = 1;
9941
9942         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9943
9944         dprintk("<-- %s status=%d\n", __func__, status);
9945
9946         return status;
9947 }
9948
9949 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9950                 struct pnfs_device *pdev,
9951                 const struct cred *cred)
9952 {
9953         struct nfs4_exception exception = { };
9954         int err;
9955
9956         do {
9957                 err = nfs4_handle_exception(server,
9958                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9959                                         &exception);
9960         } while (exception.retry);
9961         return err;
9962 }
9963 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9964
9965 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9966 {
9967         struct nfs4_layoutcommit_data *data = calldata;
9968         struct nfs_server *server = NFS_SERVER(data->args.inode);
9969
9970         nfs4_setup_sequence(server->nfs_client,
9971                         &data->args.seq_args,
9972                         &data->res.seq_res,
9973                         task);
9974 }
9975
9976 static void
9977 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9978 {
9979         struct nfs4_layoutcommit_data *data = calldata;
9980         struct nfs_server *server = NFS_SERVER(data->args.inode);
9981
9982         if (!nfs41_sequence_done(task, &data->res.seq_res))
9983                 return;
9984
9985         switch (task->tk_status) { /* Just ignore these failures */
9986         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9987         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9988         case -NFS4ERR_BADLAYOUT:     /* no layout */
9989         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9990                 task->tk_status = 0;
9991                 break;
9992         case 0:
9993                 break;
9994         default:
9995                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9996                         rpc_restart_call_prepare(task);
9997                         return;
9998                 }
9999         }
10000 }
10001
10002 static void nfs4_layoutcommit_release(void *calldata)
10003 {
10004         struct nfs4_layoutcommit_data *data = calldata;
10005
10006         pnfs_cleanup_layoutcommit(data);
10007         nfs_post_op_update_inode_force_wcc(data->args.inode,
10008                                            data->res.fattr);
10009         put_cred(data->cred);
10010         nfs_iput_and_deactive(data->inode);
10011         kfree(data);
10012 }
10013
10014 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
10015         .rpc_call_prepare = nfs4_layoutcommit_prepare,
10016         .rpc_call_done = nfs4_layoutcommit_done,
10017         .rpc_release = nfs4_layoutcommit_release,
10018 };
10019
10020 int
10021 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10022 {
10023         struct rpc_message msg = {
10024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10025                 .rpc_argp = &data->args,
10026                 .rpc_resp = &data->res,
10027                 .rpc_cred = data->cred,
10028         };
10029         struct rpc_task_setup task_setup_data = {
10030                 .task = &data->task,
10031                 .rpc_client = NFS_CLIENT(data->args.inode),
10032                 .rpc_message = &msg,
10033                 .callback_ops = &nfs4_layoutcommit_ops,
10034                 .callback_data = data,
10035                 .flags = RPC_TASK_MOVEABLE,
10036         };
10037         struct rpc_task *task;
10038         int status = 0;
10039
10040         dprintk("NFS: initiating layoutcommit call. sync %d "
10041                 "lbw: %llu inode %lu\n", sync,
10042                 data->args.lastbytewritten,
10043                 data->args.inode->i_ino);
10044
10045         if (!sync) {
10046                 data->inode = nfs_igrab_and_active(data->args.inode);
10047                 if (data->inode == NULL) {
10048                         nfs4_layoutcommit_release(data);
10049                         return -EAGAIN;
10050                 }
10051                 task_setup_data.flags = RPC_TASK_ASYNC;
10052         }
10053         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10054         task = rpc_run_task(&task_setup_data);
10055         if (IS_ERR(task))
10056                 return PTR_ERR(task);
10057         if (sync)
10058                 status = task->tk_status;
10059         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10060         dprintk("%s: status %d\n", __func__, status);
10061         rpc_put_task(task);
10062         return status;
10063 }
10064
10065 /*
10066  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10067  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10068  */
10069 static int
10070 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10071                     struct nfs_fsinfo *info,
10072                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10073 {
10074         struct nfs41_secinfo_no_name_args args = {
10075                 .style = SECINFO_STYLE_CURRENT_FH,
10076         };
10077         struct nfs4_secinfo_res res = {
10078                 .flavors = flavors,
10079         };
10080         struct rpc_message msg = {
10081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10082                 .rpc_argp = &args,
10083                 .rpc_resp = &res,
10084         };
10085         struct nfs4_call_sync_data data = {
10086                 .seq_server = server,
10087                 .seq_args = &args.seq_args,
10088                 .seq_res = &res.seq_res,
10089         };
10090         struct rpc_task_setup task_setup = {
10091                 .rpc_client = server->client,
10092                 .rpc_message = &msg,
10093                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10094                 .callback_data = &data,
10095                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10096         };
10097         const struct cred *cred = NULL;
10098         int status;
10099
10100         if (use_integrity) {
10101                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10102
10103                 cred = nfs4_get_clid_cred(server->nfs_client);
10104                 msg.rpc_cred = cred;
10105         }
10106
10107         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10108         status = nfs4_call_sync_custom(&task_setup);
10109         dprintk("<-- %s status=%d\n", __func__, status);
10110
10111         put_cred(cred);
10112
10113         return status;
10114 }
10115
10116 static int
10117 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10118                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10119 {
10120         struct nfs4_exception exception = {
10121                 .interruptible = true,
10122         };
10123         int err;
10124         do {
10125                 /* first try using integrity protection */
10126                 err = -NFS4ERR_WRONGSEC;
10127
10128                 /* try to use integrity protection with machine cred */
10129                 if (_nfs4_is_integrity_protected(server->nfs_client))
10130                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10131                                                           flavors, true);
10132
10133                 /*
10134                  * if unable to use integrity protection, or SECINFO with
10135                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10136                  * disallowed by spec, but exists in deployed servers) use
10137                  * the current filesystem's rpc_client and the user cred.
10138                  */
10139                 if (err == -NFS4ERR_WRONGSEC)
10140                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10141                                                           flavors, false);
10142
10143                 switch (err) {
10144                 case 0:
10145                 case -NFS4ERR_WRONGSEC:
10146                 case -ENOTSUPP:
10147                         goto out;
10148                 default:
10149                         err = nfs4_handle_exception(server, err, &exception);
10150                 }
10151         } while (exception.retry);
10152 out:
10153         return err;
10154 }
10155
10156 static int
10157 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10158                     struct nfs_fsinfo *info)
10159 {
10160         int err;
10161         struct page *page;
10162         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10163         struct nfs4_secinfo_flavors *flavors;
10164         struct nfs4_secinfo4 *secinfo;
10165         int i;
10166
10167         page = alloc_page(GFP_KERNEL);
10168         if (!page) {
10169                 err = -ENOMEM;
10170                 goto out;
10171         }
10172
10173         flavors = page_address(page);
10174         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10175
10176         /*
10177          * Fall back on "guess and check" method if
10178          * the server doesn't support SECINFO_NO_NAME
10179          */
10180         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10181                 err = nfs4_find_root_sec(server, fhandle, info);
10182                 goto out_freepage;
10183         }
10184         if (err)
10185                 goto out_freepage;
10186
10187         for (i = 0; i < flavors->num_flavors; i++) {
10188                 secinfo = &flavors->flavors[i];
10189
10190                 switch (secinfo->flavor) {
10191                 case RPC_AUTH_NULL:
10192                 case RPC_AUTH_UNIX:
10193                 case RPC_AUTH_GSS:
10194                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10195                                         &secinfo->flavor_info);
10196                         break;
10197                 default:
10198                         flavor = RPC_AUTH_MAXFLAVOR;
10199                         break;
10200                 }
10201
10202                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10203                         flavor = RPC_AUTH_MAXFLAVOR;
10204
10205                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10206                         err = nfs4_lookup_root_sec(server, fhandle,
10207                                                    info, flavor);
10208                         if (!err)
10209                                 break;
10210                 }
10211         }
10212
10213         if (flavor == RPC_AUTH_MAXFLAVOR)
10214                 err = -EPERM;
10215
10216 out_freepage:
10217         put_page(page);
10218         if (err == -EACCES)
10219                 return -EPERM;
10220 out:
10221         return err;
10222 }
10223
10224 static int _nfs41_test_stateid(struct nfs_server *server,
10225                 nfs4_stateid *stateid,
10226                 const struct cred *cred)
10227 {
10228         int status;
10229         struct nfs41_test_stateid_args args = {
10230                 .stateid = stateid,
10231         };
10232         struct nfs41_test_stateid_res res;
10233         struct rpc_message msg = {
10234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10235                 .rpc_argp = &args,
10236                 .rpc_resp = &res,
10237                 .rpc_cred = cred,
10238         };
10239         struct rpc_clnt *rpc_client = server->client;
10240
10241         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10242                 &rpc_client, &msg);
10243
10244         dprintk("NFS call  test_stateid %p\n", stateid);
10245         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10246         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10247                         &args.seq_args, &res.seq_res);
10248         if (status != NFS_OK) {
10249                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10250                 return status;
10251         }
10252         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10253         return -res.status;
10254 }
10255
10256 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10257                 int err, struct nfs4_exception *exception)
10258 {
10259         exception->retry = 0;
10260         switch(err) {
10261         case -NFS4ERR_DELAY:
10262         case -NFS4ERR_RETRY_UNCACHED_REP:
10263                 nfs4_handle_exception(server, err, exception);
10264                 break;
10265         case -NFS4ERR_BADSESSION:
10266         case -NFS4ERR_BADSLOT:
10267         case -NFS4ERR_BAD_HIGH_SLOT:
10268         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10269         case -NFS4ERR_DEADSESSION:
10270                 nfs4_do_handle_exception(server, err, exception);
10271         }
10272 }
10273
10274 /**
10275  * nfs41_test_stateid - perform a TEST_STATEID operation
10276  *
10277  * @server: server / transport on which to perform the operation
10278  * @stateid: state ID to test
10279  * @cred: credential
10280  *
10281  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10282  * Otherwise a negative NFS4ERR value is returned if the operation
10283  * failed or the state ID is not currently valid.
10284  */
10285 static int nfs41_test_stateid(struct nfs_server *server,
10286                 nfs4_stateid *stateid,
10287                 const struct cred *cred)
10288 {
10289         struct nfs4_exception exception = {
10290                 .interruptible = true,
10291         };
10292         int err;
10293         do {
10294                 err = _nfs41_test_stateid(server, stateid, cred);
10295                 nfs4_handle_delay_or_session_error(server, err, &exception);
10296         } while (exception.retry);
10297         return err;
10298 }
10299
10300 struct nfs_free_stateid_data {
10301         struct nfs_server *server;
10302         struct nfs41_free_stateid_args args;
10303         struct nfs41_free_stateid_res res;
10304 };
10305
10306 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10307 {
10308         struct nfs_free_stateid_data *data = calldata;
10309         nfs4_setup_sequence(data->server->nfs_client,
10310                         &data->args.seq_args,
10311                         &data->res.seq_res,
10312                         task);
10313 }
10314
10315 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10316 {
10317         struct nfs_free_stateid_data *data = calldata;
10318
10319         nfs41_sequence_done(task, &data->res.seq_res);
10320
10321         switch (task->tk_status) {
10322         case -NFS4ERR_DELAY:
10323                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10324                         rpc_restart_call_prepare(task);
10325         }
10326 }
10327
10328 static void nfs41_free_stateid_release(void *calldata)
10329 {
10330         struct nfs_free_stateid_data *data = calldata;
10331         struct nfs_client *clp = data->server->nfs_client;
10332
10333         nfs_put_client(clp);
10334         kfree(calldata);
10335 }
10336
10337 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10338         .rpc_call_prepare = nfs41_free_stateid_prepare,
10339         .rpc_call_done = nfs41_free_stateid_done,
10340         .rpc_release = nfs41_free_stateid_release,
10341 };
10342
10343 /**
10344  * nfs41_free_stateid - perform a FREE_STATEID operation
10345  *
10346  * @server: server / transport on which to perform the operation
10347  * @stateid: state ID to release
10348  * @cred: credential
10349  * @privileged: set to true if this call needs to be privileged
10350  *
10351  * Note: this function is always asynchronous.
10352  */
10353 static int nfs41_free_stateid(struct nfs_server *server,
10354                 const nfs4_stateid *stateid,
10355                 const struct cred *cred,
10356                 bool privileged)
10357 {
10358         struct rpc_message msg = {
10359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10360                 .rpc_cred = cred,
10361         };
10362         struct rpc_task_setup task_setup = {
10363                 .rpc_client = server->client,
10364                 .rpc_message = &msg,
10365                 .callback_ops = &nfs41_free_stateid_ops,
10366                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10367         };
10368         struct nfs_free_stateid_data *data;
10369         struct rpc_task *task;
10370         struct nfs_client *clp = server->nfs_client;
10371
10372         if (!refcount_inc_not_zero(&clp->cl_count))
10373                 return -EIO;
10374
10375         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10376                 &task_setup.rpc_client, &msg);
10377
10378         dprintk("NFS call  free_stateid %p\n", stateid);
10379         data = kmalloc(sizeof(*data), GFP_KERNEL);
10380         if (!data)
10381                 return -ENOMEM;
10382         data->server = server;
10383         nfs4_stateid_copy(&data->args.stateid, stateid);
10384
10385         task_setup.callback_data = data;
10386
10387         msg.rpc_argp = &data->args;
10388         msg.rpc_resp = &data->res;
10389         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10390         task = rpc_run_task(&task_setup);
10391         if (IS_ERR(task))
10392                 return PTR_ERR(task);
10393         rpc_put_task(task);
10394         return 0;
10395 }
10396
10397 static void
10398 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10399 {
10400         const struct cred *cred = lsp->ls_state->owner->so_cred;
10401
10402         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10403         nfs4_free_lock_state(server, lsp);
10404 }
10405
10406 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10407                 const nfs4_stateid *s2)
10408 {
10409         if (s1->type != s2->type)
10410                 return false;
10411
10412         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10413                 return false;
10414
10415         if (s1->seqid == s2->seqid)
10416                 return true;
10417
10418         return s1->seqid == 0 || s2->seqid == 0;
10419 }
10420
10421 #endif /* CONFIG_NFS_V4_1 */
10422
10423 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10424                 const nfs4_stateid *s2)
10425 {
10426         return nfs4_stateid_match(s1, s2);
10427 }
10428
10429
10430 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10431         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10432         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10433         .recover_open   = nfs4_open_reclaim,
10434         .recover_lock   = nfs4_lock_reclaim,
10435         .establish_clid = nfs4_init_clientid,
10436         .detect_trunking = nfs40_discover_server_trunking,
10437 };
10438
10439 #if defined(CONFIG_NFS_V4_1)
10440 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10441         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10442         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10443         .recover_open   = nfs4_open_reclaim,
10444         .recover_lock   = nfs4_lock_reclaim,
10445         .establish_clid = nfs41_init_clientid,
10446         .reclaim_complete = nfs41_proc_reclaim_complete,
10447         .detect_trunking = nfs41_discover_server_trunking,
10448 };
10449 #endif /* CONFIG_NFS_V4_1 */
10450
10451 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10452         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10453         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10454         .recover_open   = nfs40_open_expired,
10455         .recover_lock   = nfs4_lock_expired,
10456         .establish_clid = nfs4_init_clientid,
10457 };
10458
10459 #if defined(CONFIG_NFS_V4_1)
10460 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10461         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10462         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10463         .recover_open   = nfs41_open_expired,
10464         .recover_lock   = nfs41_lock_expired,
10465         .establish_clid = nfs41_init_clientid,
10466 };
10467 #endif /* CONFIG_NFS_V4_1 */
10468
10469 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10470         .sched_state_renewal = nfs4_proc_async_renew,
10471         .get_state_renewal_cred = nfs4_get_renew_cred,
10472         .renew_lease = nfs4_proc_renew,
10473 };
10474
10475 #if defined(CONFIG_NFS_V4_1)
10476 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10477         .sched_state_renewal = nfs41_proc_async_sequence,
10478         .get_state_renewal_cred = nfs4_get_machine_cred,
10479         .renew_lease = nfs4_proc_sequence,
10480 };
10481 #endif
10482
10483 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10484         .get_locations = _nfs40_proc_get_locations,
10485         .fsid_present = _nfs40_proc_fsid_present,
10486 };
10487
10488 #if defined(CONFIG_NFS_V4_1)
10489 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10490         .get_locations = _nfs41_proc_get_locations,
10491         .fsid_present = _nfs41_proc_fsid_present,
10492 };
10493 #endif  /* CONFIG_NFS_V4_1 */
10494
10495 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10496         .minor_version = 0,
10497         .init_caps = NFS_CAP_READDIRPLUS
10498                 | NFS_CAP_ATOMIC_OPEN
10499                 | NFS_CAP_POSIX_LOCK,
10500         .init_client = nfs40_init_client,
10501         .shutdown_client = nfs40_shutdown_client,
10502         .match_stateid = nfs4_match_stateid,
10503         .find_root_sec = nfs4_find_root_sec,
10504         .free_lock_state = nfs4_release_lockowner,
10505         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10506         .alloc_seqid = nfs_alloc_seqid,
10507         .call_sync_ops = &nfs40_call_sync_ops,
10508         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10509         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10510         .state_renewal_ops = &nfs40_state_renewal_ops,
10511         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10512 };
10513
10514 #if defined(CONFIG_NFS_V4_1)
10515 static struct nfs_seqid *
10516 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10517 {
10518         return NULL;
10519 }
10520
10521 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10522         .minor_version = 1,
10523         .init_caps = NFS_CAP_READDIRPLUS
10524                 | NFS_CAP_ATOMIC_OPEN
10525                 | NFS_CAP_POSIX_LOCK
10526                 | NFS_CAP_STATEID_NFSV41
10527                 | NFS_CAP_ATOMIC_OPEN_V1
10528                 | NFS_CAP_LGOPEN
10529                 | NFS_CAP_MOVEABLE,
10530         .init_client = nfs41_init_client,
10531         .shutdown_client = nfs41_shutdown_client,
10532         .match_stateid = nfs41_match_stateid,
10533         .find_root_sec = nfs41_find_root_sec,
10534         .free_lock_state = nfs41_free_lock_state,
10535         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10536         .alloc_seqid = nfs_alloc_no_seqid,
10537         .session_trunk = nfs4_test_session_trunk,
10538         .call_sync_ops = &nfs41_call_sync_ops,
10539         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10540         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10541         .state_renewal_ops = &nfs41_state_renewal_ops,
10542         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10543 };
10544 #endif
10545
10546 #if defined(CONFIG_NFS_V4_2)
10547 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10548         .minor_version = 2,
10549         .init_caps = NFS_CAP_READDIRPLUS
10550                 | NFS_CAP_ATOMIC_OPEN
10551                 | NFS_CAP_POSIX_LOCK
10552                 | NFS_CAP_STATEID_NFSV41
10553                 | NFS_CAP_ATOMIC_OPEN_V1
10554                 | NFS_CAP_LGOPEN
10555                 | NFS_CAP_ALLOCATE
10556                 | NFS_CAP_COPY
10557                 | NFS_CAP_OFFLOAD_CANCEL
10558                 | NFS_CAP_COPY_NOTIFY
10559                 | NFS_CAP_DEALLOCATE
10560                 | NFS_CAP_SEEK
10561                 | NFS_CAP_LAYOUTSTATS
10562                 | NFS_CAP_CLONE
10563                 | NFS_CAP_LAYOUTERROR
10564                 | NFS_CAP_READ_PLUS
10565                 | NFS_CAP_MOVEABLE,
10566         .init_client = nfs41_init_client,
10567         .shutdown_client = nfs41_shutdown_client,
10568         .match_stateid = nfs41_match_stateid,
10569         .find_root_sec = nfs41_find_root_sec,
10570         .free_lock_state = nfs41_free_lock_state,
10571         .call_sync_ops = &nfs41_call_sync_ops,
10572         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10573         .alloc_seqid = nfs_alloc_no_seqid,
10574         .session_trunk = nfs4_test_session_trunk,
10575         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10576         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10577         .state_renewal_ops = &nfs41_state_renewal_ops,
10578         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10579 };
10580 #endif
10581
10582 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10583         [0] = &nfs_v4_0_minor_ops,
10584 #if defined(CONFIG_NFS_V4_1)
10585         [1] = &nfs_v4_1_minor_ops,
10586 #endif
10587 #if defined(CONFIG_NFS_V4_2)
10588         [2] = &nfs_v4_2_minor_ops,
10589 #endif
10590 };
10591
10592 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10593 {
10594         ssize_t error, error2, error3;
10595         size_t left = size;
10596
10597         error = generic_listxattr(dentry, list, left);
10598         if (error < 0)
10599                 return error;
10600         if (list) {
10601                 list += error;
10602                 left -= error;
10603         }
10604
10605         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left);
10606         if (error2 < 0)
10607                 return error2;
10608
10609         if (list) {
10610                 list += error2;
10611                 left -= error2;
10612         }
10613
10614         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left);
10615         if (error3 < 0)
10616                 return error3;
10617
10618         error += error2 + error3;
10619         if (size && error > size)
10620                 return -ERANGE;
10621         return error;
10622 }
10623
10624 static void nfs4_enable_swap(struct inode *inode)
10625 {
10626         /* The state manager thread must always be running.
10627          * It will notice the client is a swapper, and stay put.
10628          */
10629         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10630
10631         nfs4_schedule_state_manager(clp);
10632 }
10633
10634 static void nfs4_disable_swap(struct inode *inode)
10635 {
10636         /* The state manager thread will now exit once it is
10637          * woken.
10638          */
10639         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10640
10641         set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
10642         clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
10643         wake_up_var(&clp->cl_state);
10644 }
10645
10646 static const struct inode_operations nfs4_dir_inode_operations = {
10647         .create         = nfs_create,
10648         .lookup         = nfs_lookup,
10649         .atomic_open    = nfs_atomic_open,
10650         .link           = nfs_link,
10651         .unlink         = nfs_unlink,
10652         .symlink        = nfs_symlink,
10653         .mkdir          = nfs_mkdir,
10654         .rmdir          = nfs_rmdir,
10655         .mknod          = nfs_mknod,
10656         .rename         = nfs_rename,
10657         .permission     = nfs_permission,
10658         .getattr        = nfs_getattr,
10659         .setattr        = nfs_setattr,
10660         .listxattr      = nfs4_listxattr,
10661 };
10662
10663 static const struct inode_operations nfs4_file_inode_operations = {
10664         .permission     = nfs_permission,
10665         .getattr        = nfs_getattr,
10666         .setattr        = nfs_setattr,
10667         .listxattr      = nfs4_listxattr,
10668 };
10669
10670 const struct nfs_rpc_ops nfs_v4_clientops = {
10671         .version        = 4,                    /* protocol version */
10672         .dentry_ops     = &nfs4_dentry_operations,
10673         .dir_inode_ops  = &nfs4_dir_inode_operations,
10674         .file_inode_ops = &nfs4_file_inode_operations,
10675         .file_ops       = &nfs4_file_operations,
10676         .getroot        = nfs4_proc_get_root,
10677         .submount       = nfs4_submount,
10678         .try_get_tree   = nfs4_try_get_tree,
10679         .getattr        = nfs4_proc_getattr,
10680         .setattr        = nfs4_proc_setattr,
10681         .lookup         = nfs4_proc_lookup,
10682         .lookupp        = nfs4_proc_lookupp,
10683         .access         = nfs4_proc_access,
10684         .readlink       = nfs4_proc_readlink,
10685         .create         = nfs4_proc_create,
10686         .remove         = nfs4_proc_remove,
10687         .unlink_setup   = nfs4_proc_unlink_setup,
10688         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10689         .unlink_done    = nfs4_proc_unlink_done,
10690         .rename_setup   = nfs4_proc_rename_setup,
10691         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10692         .rename_done    = nfs4_proc_rename_done,
10693         .link           = nfs4_proc_link,
10694         .symlink        = nfs4_proc_symlink,
10695         .mkdir          = nfs4_proc_mkdir,
10696         .rmdir          = nfs4_proc_rmdir,
10697         .readdir        = nfs4_proc_readdir,
10698         .mknod          = nfs4_proc_mknod,
10699         .statfs         = nfs4_proc_statfs,
10700         .fsinfo         = nfs4_proc_fsinfo,
10701         .pathconf       = nfs4_proc_pathconf,
10702         .set_capabilities = nfs4_server_capabilities,
10703         .decode_dirent  = nfs4_decode_dirent,
10704         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10705         .read_setup     = nfs4_proc_read_setup,
10706         .read_done      = nfs4_read_done,
10707         .write_setup    = nfs4_proc_write_setup,
10708         .write_done     = nfs4_write_done,
10709         .commit_setup   = nfs4_proc_commit_setup,
10710         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10711         .commit_done    = nfs4_commit_done,
10712         .lock           = nfs4_proc_lock,
10713         .clear_acl_cache = nfs4_zap_acl_attr,
10714         .close_context  = nfs4_close_context,
10715         .open_context   = nfs4_atomic_open,
10716         .have_delegation = nfs4_have_delegation,
10717         .alloc_client   = nfs4_alloc_client,
10718         .init_client    = nfs4_init_client,
10719         .free_client    = nfs4_free_client,
10720         .create_server  = nfs4_create_server,
10721         .clone_server   = nfs_clone_server,
10722         .discover_trunking = nfs4_discover_trunking,
10723         .enable_swap    = nfs4_enable_swap,
10724         .disable_swap   = nfs4_disable_swap,
10725 };
10726
10727 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10728         .name   = XATTR_NAME_NFSV4_ACL,
10729         .list   = nfs4_xattr_list_nfs4_acl,
10730         .get    = nfs4_xattr_get_nfs4_acl,
10731         .set    = nfs4_xattr_set_nfs4_acl,
10732 };
10733
10734 #if defined(CONFIG_NFS_V4_1)
10735 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10736         .name   = XATTR_NAME_NFSV4_DACL,
10737         .list   = nfs4_xattr_list_nfs4_dacl,
10738         .get    = nfs4_xattr_get_nfs4_dacl,
10739         .set    = nfs4_xattr_set_nfs4_dacl,
10740 };
10741
10742 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10743         .name   = XATTR_NAME_NFSV4_SACL,
10744         .list   = nfs4_xattr_list_nfs4_sacl,
10745         .get    = nfs4_xattr_get_nfs4_sacl,
10746         .set    = nfs4_xattr_set_nfs4_sacl,
10747 };
10748 #endif
10749
10750 #ifdef CONFIG_NFS_V4_2
10751 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10752         .prefix = XATTR_USER_PREFIX,
10753         .get    = nfs4_xattr_get_nfs4_user,
10754         .set    = nfs4_xattr_set_nfs4_user,
10755 };
10756 #endif
10757
10758 const struct xattr_handler *nfs4_xattr_handlers[] = {
10759         &nfs4_xattr_nfs4_acl_handler,
10760 #if defined(CONFIG_NFS_V4_1)
10761         &nfs4_xattr_nfs4_dacl_handler,
10762         &nfs4_xattr_nfs4_sacl_handler,
10763 #endif
10764 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10765         &nfs4_xattr_nfs4_label_handler,
10766 #endif
10767 #ifdef CONFIG_NFS_V4_2
10768         &nfs4_xattr_nfs4_user_handler,
10769 #endif
10770         NULL
10771 };