fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/fs_struct.h>
  36 #include <linux/file.h>
  37 #include <linux/falloc.h>
  38 #include <linux/slab.h>
  39 #include <linux/kthread.h>
  40 #include <linux/namei.h>
  41
  42 #include <linux/sunrpc/addr.h>
  43 #include <linux/nfs_ssc.h>
  44
  45 #include "idmap.h"
  46 #include "cache.h"
  47 #include "xdr4.h"
  48 #include "vfs.h"
  49 #include "current_stateid.h"
  50 #include "netns.h"
  51 #include "acl.h"
  52 #include "pnfs.h"
  53 #include "trace.h"
  54
  55 static bool inter_copy_offload_enable;
  56 module_param(inter_copy_offload_enable, bool, 0644);
  57 MODULE_PARM_DESC(inter_copy_offload_enable,
  58                  "Enable inter server to server copy offload. Default: false");
  59
  60 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
  61 static int nfsd4_ssc_umount_timeout = 900000;           /* default to 15 mins */
  62 module_param(nfsd4_ssc_umount_timeout, int, 0644);
  63 MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
  64                 "idle msecs before unmount export from source server");
  65 #endif
  66
  67 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  68
  69 static u32 nfsd_attrmask[] = {
  70         NFSD_WRITEABLE_ATTRS_WORD0,
  71         NFSD_WRITEABLE_ATTRS_WORD1,
  72         NFSD_WRITEABLE_ATTRS_WORD2
  73 };
  74
  75 static u32 nfsd41_ex_attrmask[] = {
  76         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  77         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  78         NFSD_SUPPATTR_EXCLCREAT_WORD2
  79 };
  80
  81 static __be32
  82 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  83                    u32 *bmval, u32 *writable)
  84 {
  85         struct dentry *dentry = cstate->current_fh.fh_dentry;
  86         struct svc_export *exp = cstate->current_fh.fh_export;
  87
  88         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
  89                 return nfserr_attrnotsupp;
  90         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
  91                 return nfserr_attrnotsupp;
  92         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
  93                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
  94                 return nfserr_attrnotsupp;
  95         if (writable && !bmval_is_subset(bmval, writable))
  96                 return nfserr_inval;
  97         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
  98                         (bmval[1] & FATTR4_WORD1_MODE))
  99                 return nfserr_inval;
 100         return nfs_ok;
 101 }
 102
 103 static __be32
 104 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 105         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 106 {
 107         __be32 status = nfs_ok;
 108
 109         if (open->op_create == NFS4_OPEN_CREATE) {
 110                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 111                     || open->op_createmode == NFS4_CREATE_GUARDED)
 112                         status = check_attr_support(rqstp, cstate,
 113                                         open->op_bmval, nfsd_attrmask);
 114                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 115                         status = check_attr_support(rqstp, cstate,
 116                                         open->op_bmval, nfsd41_ex_attrmask);
 117         }
 118
 119         return status;
 120 }
 121
 122 static int
 123 is_create_with_attrs(struct nfsd4_open *open)
 124 {
 125         return open->op_create == NFS4_OPEN_CREATE
 126                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 127                     || open->op_createmode == NFS4_CREATE_GUARDED
 128                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 129 }
 130
 131 static inline void
 132 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 133 {
 134         fh_put(dst);
 135         dget(src->fh_dentry);
 136         if (src->fh_export)
 137                 exp_get(src->fh_export);
 138         *dst = *src;
 139 }
 140
 141 static __be32
 142 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 143 {
 144         __be32 status;
 145
 146         if (open->op_truncate &&
 147                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 148                 return nfserr_inval;
 149
 150         accmode |= NFSD_MAY_READ_IF_EXEC;
 151
 152         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 153                 accmode |= NFSD_MAY_READ;
 154         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 155                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 156         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 157                 accmode |= NFSD_MAY_WRITE;
 158
 159         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 160
 161         return status;
 162 }
 163
 164 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 165 {
 166         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 167
 168         if (S_ISREG(mode))
 169                 return nfs_ok;
 170         if (S_ISDIR(mode))
 171                 return nfserr_isdir;
 172         /*
 173          * Using err_symlink as our catch-all case may look odd; but
 174          * there's no other obvious error for this case in 4.0, and we
 175          * happen to know that it will cause the linux v4 client to do
 176          * the right thing on attempts to open something other than a
 177          * regular file.
 178          */
 179         return nfserr_symlink;
 180 }
 181
 182 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 183 {
 184         if (nfsd4_has_session(cstate))
 185                 return;
 186         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 187                         &resfh->fh_handle);
 188 }
 189
 190 static inline bool nfsd4_create_is_exclusive(int createmode)
 191 {
 192         return createmode == NFS4_CREATE_EXCLUSIVE ||
 193                 createmode == NFS4_CREATE_EXCLUSIVE4_1;
 194 }
 195
 196 static __be32
 197 nfsd4_vfs_create(struct svc_fh *fhp, struct dentry *child,
 198                  struct nfsd4_open *open)
 199 {
 200         struct file *filp;
 201         struct path path;
 202         int oflags;
 203
 204         oflags = O_CREAT | O_LARGEFILE;
 205         switch (open->op_share_access & NFS4_SHARE_ACCESS_BOTH) {
 206         case NFS4_SHARE_ACCESS_WRITE:
 207                 oflags |= O_WRONLY;
 208                 break;
 209         case NFS4_SHARE_ACCESS_BOTH:
 210                 oflags |= O_RDWR;
 211                 break;
 212         default:
 213                 oflags |= O_RDONLY;
 214         }
 215
 216         path.mnt = fhp->fh_export->ex_path.mnt;
 217         path.dentry = child;
 218         filp = dentry_create(&path, oflags, open->op_iattr.ia_mode,
 219                              current_cred());
 220         if (IS_ERR(filp))
 221                 return nfserrno(PTR_ERR(filp));
 222
 223         open->op_filp = filp;
 224         return nfs_ok;
 225 }
 226
 227 /*
 228  * Implement NFSv4's unchecked, guarded, and exclusive create
 229  * semantics for regular files. Open state for this new file is
 230  * subsequently fabricated in nfsd4_process_open2().
 231  *
 232  * Upon return, caller must release @fhp and @resfhp.
 233  */
 234 static __be32
 235 nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
 236                   struct svc_fh *resfhp, struct nfsd4_open *open)
 237 {
 238         struct iattr *iap = &open->op_iattr;
 239         struct nfsd_attrs attrs = {
 240                 .na_iattr       = iap,
 241                 .na_seclabel    = &open->op_label,
 242         };
 243         struct dentry *parent, *child;
 244         __u32 v_mtime, v_atime;
 245         struct inode *inode;
 246         __be32 status;
 247         int host_err;
 248
 249         if (isdotent(open->op_fname, open->op_fnamelen))
 250                 return nfserr_exist;
 251         if (!(iap->ia_valid & ATTR_MODE))
 252                 iap->ia_mode = 0;
 253
 254         status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
 255         if (status != nfs_ok)
 256                 return status;
 257         parent = fhp->fh_dentry;
 258         inode = d_inode(parent);
 259
 260         host_err = fh_want_write(fhp);
 261         if (host_err)
 262                 return nfserrno(host_err);
 263
 264         if (is_create_with_attrs(open))
 265                 nfsd4_acl_to_attr(NF4REG, open->op_acl, &attrs);
 266
 267         inode_lock_nested(inode, I_MUTEX_PARENT);
 268
 269         child = lookup_one_len(open->op_fname, parent, open->op_fnamelen);
 270         if (IS_ERR(child)) {
 271                 status = nfserrno(PTR_ERR(child));
 272                 goto out;
 273         }
 274
 275         if (d_really_is_negative(child)) {
 276                 status = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
 277                 if (status != nfs_ok)
 278                         goto out;
 279         }
 280
 281         status = fh_compose(resfhp, fhp->fh_export, child, fhp);
 282         if (status != nfs_ok)
 283                 goto out;
 284
 285         v_mtime = 0;
 286         v_atime = 0;
 287         if (nfsd4_create_is_exclusive(open->op_createmode)) {
 288                 u32 *verifier = (u32 *)open->op_verf.data;
 289
 290                 /*
 291                  * Solaris 7 gets confused (bugid 4218508) if these have
 292                  * the high bit set, as do xfs filesystems without the
 293                  * "bigtime" feature. So just clear the high bits. If this
 294                  * is ever changed to use different attrs for storing the
 295                  * verifier, then do_open_lookup() will also need to be
 296                  * fixed accordingly.
 297                  */
 298                 v_mtime = verifier[0] & 0x7fffffff;
 299                 v_atime = verifier[1] & 0x7fffffff;
 300         }
 301
 302         if (d_really_is_positive(child)) {
 303                 status = nfs_ok;
 304
 305                 /* NFSv4 protocol requires change attributes even though
 306                  * no change happened.
 307                  */
 308                 fh_fill_both_attrs(fhp);
 309
 310                 switch (open->op_createmode) {
 311                 case NFS4_CREATE_UNCHECKED:
 312                         if (!d_is_reg(child))
 313                                 break;
 314
 315                         /*
 316                          * In NFSv4, we don't want to truncate the file
 317                          * now. This would be wrong if the OPEN fails for
 318                          * some other reason. Furthermore, if the size is
 319                          * nonzero, we should ignore it according to spec!
 320                          */
 321                         open->op_truncate = (iap->ia_valid & ATTR_SIZE) &&
 322                                                 !iap->ia_size;
 323                         break;
 324                 case NFS4_CREATE_GUARDED:
 325                         status = nfserr_exist;
 326                         break;
 327                 case NFS4_CREATE_EXCLUSIVE:
 328                         if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
 329                             d_inode(child)->i_atime.tv_sec == v_atime &&
 330                             d_inode(child)->i_size == 0) {
 331                                 open->op_created = true;
 332                                 break;          /* subtle */
 333                         }
 334                         status = nfserr_exist;
 335                         break;
 336                 case NFS4_CREATE_EXCLUSIVE4_1:
 337                         if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
 338                             d_inode(child)->i_atime.tv_sec == v_atime &&
 339                             d_inode(child)->i_size == 0) {
 340                                 open->op_created = true;
 341                                 goto set_attr;  /* subtle */
 342                         }
 343                         status = nfserr_exist;
 344                 }
 345                 goto out;
 346         }
 347
 348         if (!IS_POSIXACL(inode))
 349                 iap->ia_mode &= ~current_umask();
 350
 351         fh_fill_pre_attrs(fhp);
 352         status = nfsd4_vfs_create(fhp, child, open);
 353         if (status != nfs_ok)
 354                 goto out;
 355         open->op_created = true;
 356         fh_fill_post_attrs(fhp);
 357
 358         /* A newly created file already has a file size of zero. */
 359         if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
 360                 iap->ia_valid &= ~ATTR_SIZE;
 361         if (nfsd4_create_is_exclusive(open->op_createmode)) {
 362                 iap->ia_valid = ATTR_MTIME | ATTR_ATIME |
 363                                 ATTR_MTIME_SET|ATTR_ATIME_SET;
 364                 iap->ia_mtime.tv_sec = v_mtime;
 365                 iap->ia_atime.tv_sec = v_atime;
 366                 iap->ia_mtime.tv_nsec = 0;
 367                 iap->ia_atime.tv_nsec = 0;
 368         }
 369
 370 set_attr:
 371         status = nfsd_create_setattr(rqstp, fhp, resfhp, &attrs);
 372
 373         if (attrs.na_labelerr)
 374                 open->op_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 375         if (attrs.na_aclerr)
 376                 open->op_bmval[0] &= ~FATTR4_WORD0_ACL;
 377 out:
 378         inode_unlock(inode);
 379         nfsd_attrs_free(&attrs);
 380         if (child && !IS_ERR(child))
 381                 dput(child);
 382         fh_drop_write(fhp);
 383         return status;
 384 }
 385
 386 static __be32
 387 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 388 {
 389         struct svc_fh *current_fh = &cstate->current_fh;
 390         int accmode;
 391         __be32 status;
 392
 393         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 394         if (!*resfh)
 395                 return nfserr_jukebox;
 396         fh_init(*resfh, NFS4_FHSIZE);
 397         open->op_truncate = false;
 398
 399         if (open->op_create) {
 400                 /* FIXME: check session persistence and pnfs flags.
 401                  * The nfsv4.1 spec requires the following semantics:
 402                  *
 403                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 404                  * Reply Cache  | server |                 |
 405                  * -------------+--------+-----------------+--------------------
 406                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 407                  *              |        |                 | (SHOULD)
 408                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 409                  *              |        |                 | (SHOULD NOT)
 410                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 411                  * yes          | no     | GUARDED4        | GUARDED4
 412                  * yes          | yes    | GUARDED4        | GUARDED4
 413                  */
 414
 415                 current->fs->umask = open->op_umask;
 416                 status = nfsd4_create_file(rqstp, current_fh, *resfh, open);
 417                 current->fs->umask = 0;
 418
 419                 /*
 420                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 421                  * use the returned bitmask to indicate which attributes
 422                  * we used to store the verifier:
 423                  */
 424                 if (nfsd4_create_is_exclusive(open->op_createmode) && status == 0)
 425                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 426                                                 FATTR4_WORD1_TIME_MODIFY);
 427         } else {
 428                 status = nfsd_lookup(rqstp, current_fh,
 429                                      open->op_fname, open->op_fnamelen, *resfh);
 430                 if (!status)
 431                         /* NFSv4 protocol requires change attributes even though
 432                          * no change happened.
 433                          */
 434                         fh_fill_both_attrs(current_fh);
 435         }
 436         if (status)
 437                 goto out;
 438         status = nfsd_check_obj_isreg(*resfh);
 439         if (status)
 440                 goto out;
 441
 442         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 443         accmode = NFSD_MAY_NOP;
 444         if (open->op_created ||
 445                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 446                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 447         status = do_open_permission(rqstp, *resfh, open, accmode);
 448         set_change_info(&open->op_cinfo, current_fh);
 449 out:
 450         return status;
 451 }
 452
 453 static __be32
 454 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 455 {
 456         struct svc_fh *current_fh = &cstate->current_fh;
 457         __be32 status;
 458         int accmode = 0;
 459
 460         /* We don't know the target directory, and therefore can not
 461         * set the change info
 462         */
 463
 464         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 465
 466         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 467
 468         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 469                 (open->op_iattr.ia_size == 0);
 470         /*
 471          * In the delegation case, the client is telling us about an
 472          * open that it *already* performed locally, some time ago.  We
 473          * should let it succeed now if possible.
 474          *
 475          * In the case of a CLAIM_FH open, on the other hand, the client
 476          * may be counting on us to enforce permissions (the Linux 4.1
 477          * client uses this for normal opens, for example).
 478          */
 479         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 480                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 481
 482         status = do_open_permission(rqstp, current_fh, open, accmode);
 483
 484         return status;
 485 }
 486
 487 static void
 488 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 489 {
 490         struct nfsd4_sessionid *sid =
 491                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 492
 493         clid->cl_boot = sid->clientid.cl_boot;
 494         clid->cl_id = sid->clientid.cl_id;
 495 }
 496
 497 static __be32
 498 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499            union nfsd4_op_u *u)
 500 {
 501         struct nfsd4_open *open = &u->open;
 502         __be32 status;
 503         struct svc_fh *resfh = NULL;
 504         struct net *net = SVC_NET(rqstp);
 505         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 506         bool reclaim = false;
 507
 508         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 509                 (int)open->op_fnamelen, open->op_fname,
 510                 open->op_openowner);
 511
 512         open->op_filp = NULL;
 513         open->op_rqstp = rqstp;
 514
 515         /* This check required by spec. */
 516         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 517                 return nfserr_inval;
 518
 519         open->op_created = false;
 520         /*
 521          * RFC5661 18.51.3
 522          * Before RECLAIM_COMPLETE done, server should deny new lock
 523          */
 524         if (nfsd4_has_session(cstate) &&
 525             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags) &&
 526             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 527                 return nfserr_grace;
 528
 529         if (nfsd4_has_session(cstate))
 530                 copy_clientid(&open->op_clientid, cstate->session);
 531
 532         /* check seqid for replay. set nfs4_owner */
 533         status = nfsd4_process_open1(cstate, open, nn);
 534         if (status == nfserr_replay_me) {
 535                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 536                 fh_put(&cstate->current_fh);
 537                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 538                                 &rp->rp_openfh);
 539                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 540                 if (status)
 541                         dprintk("nfsd4_open: replay failed"
 542                                 " restoring previous filehandle\n");
 543                 else
 544                         status = nfserr_replay_me;
 545         }
 546         if (status)
 547                 goto out;
 548         if (open->op_xdr_error) {
 549                 status = open->op_xdr_error;
 550                 goto out;
 551         }
 552
 553         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 554         if (status)
 555                 goto out;
 556
 557         /* Openowner is now set, so sequence id will get bumped.  Now we need
 558          * these checks before we do any creates: */
 559         status = nfserr_grace;
 560         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 561                 goto out;
 562         status = nfserr_no_grace;
 563         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 564                 goto out;
 565
 566         switch (open->op_claim_type) {
 567         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 568         case NFS4_OPEN_CLAIM_NULL:
 569                 status = do_open_lookup(rqstp, cstate, open, &resfh);
 570                 if (status)
 571                         goto out;
 572                 break;
 573         case NFS4_OPEN_CLAIM_PREVIOUS:
 574                 status = nfs4_check_open_reclaim(cstate->clp);
 575                 if (status)
 576                         goto out;
 577                 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 578                 reclaim = true;
 579                 fallthrough;
 580         case NFS4_OPEN_CLAIM_FH:
 581         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 582                 status = do_open_fhandle(rqstp, cstate, open);
 583                 if (status)
 584                         goto out;
 585                 resfh = &cstate->current_fh;
 586                 break;
 587         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 588         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 589                 status = nfserr_notsupp;
 590                 goto out;
 591         default:
 592                 status = nfserr_inval;
 593                 goto out;
 594         }
 595
 596         status = nfsd4_process_open2(rqstp, resfh, open);
 597         if (status && open->op_created)
 598                 pr_warn("nfsd4_process_open2 failed to open newly-created file: status=%u\n",
 599                         be32_to_cpu(status));
 600         if (reclaim && !status)
 601                 nn->somebody_reclaimed = true;
 602 out:
 603         if (open->op_filp) {
 604                 fput(open->op_filp);
 605                 open->op_filp = NULL;
 606         }
 607         if (resfh && resfh != &cstate->current_fh) {
 608                 fh_dup2(&cstate->current_fh, resfh);
 609                 fh_put(resfh);
 610                 kfree(resfh);
 611         }
 612         nfsd4_cleanup_open_state(cstate, open);
 613         nfsd4_bump_seqid(cstate, status);
 614         return status;
 615 }
 616
 617 /*
 618  * OPEN is the only seqid-mutating operation whose decoding can fail
 619  * with a seqid-mutating error (specifically, decoding of user names in
 620  * the attributes).  Therefore we have to do some processing to look up
 621  * the stateowner so that we can bump the seqid.
 622  */
 623 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 624 {
 625         struct nfsd4_open *open = &op->u.open;
 626
 627         if (!seqid_mutating_err(ntohl(op->status)))
 628                 return op->status;
 629         if (nfsd4_has_session(cstate))
 630                 return op->status;
 631         open->op_xdr_error = op->status;
 632         return nfsd4_open(rqstp, cstate, &op->u);
 633 }
 634
 635 /*
 636  * filehandle-manipulating ops.
 637  */
 638 static __be32
 639 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 640             union nfsd4_op_u *u)
 641 {
 642         u->getfh = &cstate->current_fh;
 643         return nfs_ok;
 644 }
 645
 646 static __be32
 647 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 648             union nfsd4_op_u *u)
 649 {
 650         struct nfsd4_putfh *putfh = &u->putfh;
 651         __be32 ret;
 652
 653         fh_put(&cstate->current_fh);
 654         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 655         memcpy(&cstate->current_fh.fh_handle.fh_raw, putfh->pf_fhval,
 656                putfh->pf_fhlen);
 657         ret = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 658 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
 659         if (ret == nfserr_stale && putfh->no_verify) {
 660                 SET_FH_FLAG(&cstate->current_fh, NFSD4_FH_FOREIGN);
 661                 ret = 0;
 662         }
 663 #endif
 664         return ret;
 665 }
 666
 667 static __be32
 668 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 669                 union nfsd4_op_u *u)
 670 {
 671         __be32 status;
 672
 673         fh_put(&cstate->current_fh);
 674         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 675         return status;
 676 }
 677
 678 static __be32
 679 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 680                 union nfsd4_op_u *u)
 681 {
 682         if (!cstate->save_fh.fh_dentry)
 683                 return nfserr_restorefh;
 684
 685         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 686         if (HAS_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG)) {
 687                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 688                 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
 689         }
 690         return nfs_ok;
 691 }
 692
 693 static __be32
 694 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 695              union nfsd4_op_u *u)
 696 {
 697         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 698         if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG)) {
 699                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 700                 SET_CSTATE_FLAG(cstate, SAVED_STATE_ID_FLAG);
 701         }
 702         return nfs_ok;
 703 }
 704
 705 /*
 706  * misc nfsv4 ops
 707  */
 708 static __be32
 709 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 710              union nfsd4_op_u *u)
 711 {
 712         struct nfsd4_access *access = &u->access;
 713         u32 access_full;
 714
 715         access_full = NFS3_ACCESS_FULL;
 716         if (cstate->minorversion >= 2)
 717                 access_full |= NFS4_ACCESS_XALIST | NFS4_ACCESS_XAREAD |
 718                                NFS4_ACCESS_XAWRITE;
 719
 720         if (access->ac_req_access & ~access_full)
 721                 return nfserr_inval;
 722
 723         access->ac_resp_access = access->ac_req_access;
 724         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 725                            &access->ac_supported);
 726 }
 727
 728 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 729 {
 730         __be32 *verf = (__be32 *)verifier->data;
 731
 732         BUILD_BUG_ON(2*sizeof(*verf) != sizeof(verifier->data));
 733
 734         nfsd_copy_write_verifier(verf, net_generic(net, nfsd_net_id));
 735 }
 736
 737 static __be32
 738 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 739              union nfsd4_op_u *u)
 740 {
 741         struct nfsd4_commit *commit = &u->commit;
 742
 743         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 744                              commit->co_count,
 745                              (__be32 *)commit->co_verf.data);
 746 }
 747
 748 static __be32
 749 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 750              union nfsd4_op_u *u)
 751 {
 752         struct nfsd4_create *create = &u->create;
 753         struct nfsd_attrs attrs = {
 754                 .na_iattr       = &create->cr_iattr,
 755                 .na_seclabel    = &create->cr_label,
 756         };
 757         struct svc_fh resfh;
 758         __be32 status;
 759         dev_t rdev;
 760
 761         fh_init(&resfh, NFS4_FHSIZE);
 762
 763         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 764         if (status)
 765                 return status;
 766
 767         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 768                                     nfsd_attrmask);
 769         if (status)
 770                 return status;
 771
 772         status = nfsd4_acl_to_attr(create->cr_type, create->cr_acl, &attrs);
 773         current->fs->umask = create->cr_umask;
 774         switch (create->cr_type) {
 775         case NF4LNK:
 776                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 777                                       create->cr_name, create->cr_namelen,
 778                                       create->cr_data, &attrs, &resfh);
 779                 break;
 780
 781         case NF4BLK:
 782                 status = nfserr_inval;
 783                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 784                 if (MAJOR(rdev) != create->cr_specdata1 ||
 785                     MINOR(rdev) != create->cr_specdata2)
 786                         goto out_umask;
 787                 status = nfsd_create(rqstp, &cstate->current_fh,
 788                                      create->cr_name, create->cr_namelen,
 789                                      &attrs, S_IFBLK, rdev, &resfh);
 790                 break;
 791
 792         case NF4CHR:
 793                 status = nfserr_inval;
 794                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 795                 if (MAJOR(rdev) != create->cr_specdata1 ||
 796                     MINOR(rdev) != create->cr_specdata2)
 797                         goto out_umask;
 798                 status = nfsd_create(rqstp, &cstate->current_fh,
 799                                      create->cr_name, create->cr_namelen,
 800                                      &attrs, S_IFCHR, rdev, &resfh);
 801                 break;
 802
 803         case NF4SOCK:
 804                 status = nfsd_create(rqstp, &cstate->current_fh,
 805                                      create->cr_name, create->cr_namelen,
 806                                      &attrs, S_IFSOCK, 0, &resfh);
 807                 break;
 808
 809         case NF4FIFO:
 810                 status = nfsd_create(rqstp, &cstate->current_fh,
 811                                      create->cr_name, create->cr_namelen,
 812                                      &attrs, S_IFIFO, 0, &resfh);
 813                 break;
 814
 815         case NF4DIR:
 816                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 817                 status = nfsd_create(rqstp, &cstate->current_fh,
 818                                      create->cr_name, create->cr_namelen,
 819                                      &attrs, S_IFDIR, 0, &resfh);
 820                 break;
 821
 822         default:
 823                 status = nfserr_badtype;
 824         }
 825
 826         if (status)
 827                 goto out;
 828
 829         if (attrs.na_labelerr)
 830                 create->cr_bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 831         if (attrs.na_aclerr)
 832                 create->cr_bmval[0] &= ~FATTR4_WORD0_ACL;
 833         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 834         fh_dup2(&cstate->current_fh, &resfh);
 835 out:
 836         fh_put(&resfh);
 837 out_umask:
 838         current->fs->umask = 0;
 839         nfsd_attrs_free(&attrs);
 840         return status;
 841 }
 842
 843 static __be32
 844 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 845               union nfsd4_op_u *u)
 846 {
 847         struct nfsd4_getattr *getattr = &u->getattr;
 848         __be32 status;
 849
 850         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 851         if (status)
 852                 return status;
 853
 854         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 855                 return nfserr_inval;
 856
 857         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 858         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 859         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 860
 861         getattr->ga_fhp = &cstate->current_fh;
 862         return nfs_ok;
 863 }
 864
 865 static __be32
 866 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 867            union nfsd4_op_u *u)
 868 {
 869         struct nfsd4_link *link = &u->link;
 870         __be32 status;
 871
 872         status = nfsd_link(rqstp, &cstate->current_fh,
 873                            link->li_name, link->li_namelen, &cstate->save_fh);
 874         if (!status)
 875                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 876         return status;
 877 }
 878
 879 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 880 {
 881         struct svc_fh tmp_fh;
 882         __be32 ret;
 883
 884         fh_init(&tmp_fh, NFS4_FHSIZE);
 885         ret = exp_pseudoroot(rqstp, &tmp_fh);
 886         if (ret)
 887                 return ret;
 888         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 889                 fh_put(&tmp_fh);
 890                 return nfserr_noent;
 891         }
 892         fh_put(&tmp_fh);
 893         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 894 }
 895
 896 static __be32
 897 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 898               union nfsd4_op_u *u)
 899 {
 900         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 901 }
 902
 903 static __be32
 904 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 905              union nfsd4_op_u *u)
 906 {
 907         return nfsd_lookup(rqstp, &cstate->current_fh,
 908                            u->lookup.lo_name, u->lookup.lo_len,
 909                            &cstate->current_fh);
 910 }
 911
 912 static __be32
 913 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 914            union nfsd4_op_u *u)
 915 {
 916         struct nfsd4_read *read = &u->read;
 917         __be32 status;
 918
 919         read->rd_nf = NULL;
 920
 921         trace_nfsd_read_start(rqstp, &cstate->current_fh,
 922                               read->rd_offset, read->rd_length);
 923
 924         read->rd_length = min_t(u32, read->rd_length, svc_max_payload(rqstp));
 925         if (read->rd_offset > (u64)OFFSET_MAX)
 926                 read->rd_offset = (u64)OFFSET_MAX;
 927         if (read->rd_offset + read->rd_length > (u64)OFFSET_MAX)
 928                 read->rd_length = (u64)OFFSET_MAX - read->rd_offset;
 929
 930         /*
 931          * If we do a zero copy read, then a client will see read data
 932          * that reflects the state of the file *after* performing the
 933          * following compound.
 934          *
 935          * To ensure proper ordering, we therefore turn off zero copy if
 936          * the client wants us to do more in this compound:
 937          */
 938         if (!nfsd4_last_compound_op(rqstp))
 939                 __clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 940
 941         /* check stateid */
 942         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 943                                         &read->rd_stateid, RD_STATE,
 944                                         &read->rd_nf, NULL);
 945         if (status) {
 946                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 947                 goto out;
 948         }
 949         status = nfs_ok;
 950 out:
 951         read->rd_rqstp = rqstp;
 952         read->rd_fhp = &cstate->current_fh;
 953         return status;
 954 }
 955
 956
 957 static void
 958 nfsd4_read_release(union nfsd4_op_u *u)
 959 {
 960         if (u->read.rd_nf)
 961                 nfsd_file_put(u->read.rd_nf);
 962         trace_nfsd_read_done(u->read.rd_rqstp, u->read.rd_fhp,
 963                              u->read.rd_offset, u->read.rd_length);
 964 }
 965
 966 static __be32
 967 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 968               union nfsd4_op_u *u)
 969 {
 970         struct nfsd4_readdir *readdir = &u->readdir;
 971         u64 cookie = readdir->rd_cookie;
 972         static const nfs4_verifier zeroverf;
 973
 974         /* no need to check permission - this will be done in nfsd_readdir() */
 975
 976         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 977                 return nfserr_inval;
 978
 979         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 980         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 981         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 982
 983         if ((cookie == 1) || (cookie == 2) ||
 984             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 985                 return nfserr_bad_cookie;
 986
 987         readdir->rd_rqstp = rqstp;
 988         readdir->rd_fhp = &cstate->current_fh;
 989         return nfs_ok;
 990 }
 991
 992 static __be32
 993 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 994                union nfsd4_op_u *u)
 995 {
 996         u->readlink.rl_rqstp = rqstp;
 997         u->readlink.rl_fhp = &cstate->current_fh;
 998         return nfs_ok;
 999 }
1000
1001 static __be32
1002 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1003              union nfsd4_op_u *u)
1004 {
1005         struct nfsd4_remove *remove = &u->remove;
1006         __be32 status;
1007
1008         if (opens_in_grace(SVC_NET(rqstp)))
1009                 return nfserr_grace;
1010         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
1011                              remove->rm_name, remove->rm_namelen);
1012         if (!status)
1013                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
1014         return status;
1015 }
1016
1017 static __be32
1018 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1019              union nfsd4_op_u *u)
1020 {
1021         struct nfsd4_rename *rename = &u->rename;
1022         __be32 status;
1023
1024         if (opens_in_grace(SVC_NET(rqstp)))
1025                 return nfserr_grace;
1026         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
1027                              rename->rn_snamelen, &cstate->current_fh,
1028                              rename->rn_tname, rename->rn_tnamelen);
1029         if (status)
1030                 return status;
1031         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
1032         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
1033         return nfs_ok;
1034 }
1035
1036 static __be32
1037 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1038               union nfsd4_op_u *u)
1039 {
1040         struct nfsd4_secinfo *secinfo = &u->secinfo;
1041         struct svc_export *exp;
1042         struct dentry *dentry;
1043         __be32 err;
1044
1045         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
1046         if (err)
1047                 return err;
1048         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
1049                                     secinfo->si_name, secinfo->si_namelen,
1050                                     &exp, &dentry);
1051         if (err)
1052                 return err;
1053         if (d_really_is_negative(dentry)) {
1054                 exp_put(exp);
1055                 err = nfserr_noent;
1056         } else
1057                 secinfo->si_exp = exp;
1058         dput(dentry);
1059         if (cstate->minorversion)
1060                 /* See rfc 5661 section 2.6.3.1.1.8 */
1061                 fh_put(&cstate->current_fh);
1062         return err;
1063 }
1064
1065 static __be32
1066 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1067                 union nfsd4_op_u *u)
1068 {
1069         __be32 err;
1070
1071         switch (u->secinfo_no_name.sin_style) {
1072         case NFS4_SECINFO_STYLE4_CURRENT_FH:
1073                 break;
1074         case NFS4_SECINFO_STYLE4_PARENT:
1075                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
1076                 if (err)
1077                         return err;
1078                 break;
1079         default:
1080                 return nfserr_inval;
1081         }
1082
1083         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
1084         fh_put(&cstate->current_fh);
1085         return nfs_ok;
1086 }
1087
1088 static void
1089 nfsd4_secinfo_release(union nfsd4_op_u *u)
1090 {
1091         if (u->secinfo.si_exp)
1092                 exp_put(u->secinfo.si_exp);
1093 }
1094
1095 static void
1096 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
1097 {
1098         if (u->secinfo_no_name.sin_exp)
1099                 exp_put(u->secinfo_no_name.sin_exp);
1100 }
1101
1102 static __be32
1103 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1104               union nfsd4_op_u *u)
1105 {
1106         struct nfsd4_setattr *setattr = &u->setattr;
1107         struct nfsd_attrs attrs = {
1108                 .na_iattr       = &setattr->sa_iattr,
1109                 .na_seclabel    = &setattr->sa_label,
1110         };
1111         struct inode *inode;
1112         __be32 status = nfs_ok;
1113         int err;
1114
1115         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
1116                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
1117                                 &cstate->current_fh, &setattr->sa_stateid,
1118                                 WR_STATE, NULL, NULL);
1119                 if (status) {
1120                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
1121                         return status;
1122                 }
1123         }
1124         err = fh_want_write(&cstate->current_fh);
1125         if (err)
1126                 return nfserrno(err);
1127         status = nfs_ok;
1128
1129         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
1130                                     nfsd_attrmask);
1131         if (status)
1132                 goto out;
1133
1134         inode = cstate->current_fh.fh_dentry->d_inode;
1135         status = nfsd4_acl_to_attr(S_ISDIR(inode->i_mode) ? NF4DIR : NF4REG,
1136                                    setattr->sa_acl, &attrs);
1137
1138         if (status)
1139                 goto out;
1140         status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs,
1141                                 0, (time64_t)0);
1142         if (!status)
1143                 status = nfserrno(attrs.na_labelerr);
1144 out:
1145         nfsd_attrs_free(&attrs);
1146         fh_drop_write(&cstate->current_fh);
1147         return status;
1148 }
1149
1150 static __be32
1151 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1152             union nfsd4_op_u *u)
1153 {
1154         struct nfsd4_write *write = &u->write;
1155         stateid_t *stateid = &write->wr_stateid;
1156         struct nfsd_file *nf = NULL;
1157         __be32 status = nfs_ok;
1158         unsigned long cnt;
1159         int nvecs;
1160
1161         if (write->wr_offset > (u64)OFFSET_MAX ||
1162             write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1163                 return nfserr_fbig;
1164
1165         cnt = write->wr_buflen;
1166         trace_nfsd_write_start(rqstp, &cstate->current_fh,
1167                                write->wr_offset, cnt);
1168         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1169                                                 stateid, WR_STATE, &nf, NULL);
1170         if (status) {
1171                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1172                 return status;
1173         }
1174
1175         write->wr_how_written = write->wr_stable_how;
1176
1177         nvecs = svc_fill_write_vector(rqstp, &write->wr_payload);
1178         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1179
1180         status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
1181                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1182                                 write->wr_how_written,
1183                                 (__be32 *)write->wr_verifier.data);
1184         nfsd_file_put(nf);
1185
1186         write->wr_bytes_written = cnt;
1187         trace_nfsd_write_done(rqstp, &cstate->current_fh,
1188                               write->wr_offset, cnt);
1189         return status;
1190 }
1191
1192 static __be32
1193 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1194                   stateid_t *src_stateid, struct nfsd_file **src,
1195                   stateid_t *dst_stateid, struct nfsd_file **dst)
1196 {
1197         __be32 status;
1198
1199         if (!cstate->save_fh.fh_dentry)
1200                 return nfserr_nofilehandle;
1201
1202         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1203                                             src_stateid, RD_STATE, src, NULL);
1204         if (status) {
1205                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1206                 goto out;
1207         }
1208
1209         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1210                                             dst_stateid, WR_STATE, dst, NULL);
1211         if (status) {
1212                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1213                 goto out_put_src;
1214         }
1215
1216         /* fix up for NFS-specific error code */
1217         if (!S_ISREG(file_inode((*src)->nf_file)->i_mode) ||
1218             !S_ISREG(file_inode((*dst)->nf_file)->i_mode)) {
1219                 status = nfserr_wrong_type;
1220                 goto out_put_dst;
1221         }
1222
1223 out:
1224         return status;
1225 out_put_dst:
1226         nfsd_file_put(*dst);
1227 out_put_src:
1228         nfsd_file_put(*src);
1229         goto out;
1230 }
1231
1232 static __be32
1233 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1234                 union nfsd4_op_u *u)
1235 {
1236         struct nfsd4_clone *clone = &u->clone;
1237         struct nfsd_file *src, *dst;
1238         __be32 status;
1239
1240         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1241                                    &clone->cl_dst_stateid, &dst);
1242         if (status)
1243                 goto out;
1244
1245         status = nfsd4_clone_file_range(rqstp, src, clone->cl_src_pos,
1246                         dst, clone->cl_dst_pos, clone->cl_count,
1247                         EX_ISSYNC(cstate->current_fh.fh_export));
1248
1249         nfsd_file_put(dst);
1250         nfsd_file_put(src);
1251 out:
1252         return status;
1253 }
1254
1255 static void nfs4_put_copy(struct nfsd4_copy *copy)
1256 {
1257         if (!refcount_dec_and_test(&copy->refcount))
1258                 return;
1259         kfree(copy->cp_src);
1260         kfree(copy);
1261 }
1262
1263 static void nfsd4_stop_copy(struct nfsd4_copy *copy)
1264 {
1265         if (!test_and_set_bit(NFSD4_COPY_F_STOPPED, &copy->cp_flags))
1266                 kthread_stop(copy->copy_task);
1267         nfs4_put_copy(copy);
1268 }
1269
1270 static struct nfsd4_copy *nfsd4_get_copy(struct nfs4_client *clp)
1271 {
1272         struct nfsd4_copy *copy = NULL;
1273
1274         spin_lock(&clp->async_lock);
1275         if (!list_empty(&clp->async_copies)) {
1276                 copy = list_first_entry(&clp->async_copies, struct nfsd4_copy,
1277                                         copies);
1278                 refcount_inc(&copy->refcount);
1279         }
1280         spin_unlock(&clp->async_lock);
1281         return copy;
1282 }
1283
1284 void nfsd4_shutdown_copy(struct nfs4_client *clp)
1285 {
1286         struct nfsd4_copy *copy;
1287
1288         while ((copy = nfsd4_get_copy(clp)) != NULL)
1289                 nfsd4_stop_copy(copy);
1290 }
1291 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
1292
1293 extern struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1294                                    struct nfs_fh *src_fh,
1295                                    nfs4_stateid *stateid);
1296 extern void nfs42_ssc_close(struct file *filep);
1297
1298 extern void nfs_sb_deactive(struct super_block *sb);
1299
1300 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
1301
1302 /*
1303  * setup a work entry in the ssc delayed unmount list.
1304  */
1305 static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
1306                 struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt)
1307 {
1308         struct nfsd4_ssc_umount_item *ni = NULL;
1309         struct nfsd4_ssc_umount_item *work = NULL;
1310         struct nfsd4_ssc_umount_item *tmp;
1311         DEFINE_WAIT(wait);
1312
1313         *ss_mnt = NULL;
1314         *retwork = NULL;
1315         work = kzalloc(sizeof(*work), GFP_KERNEL);
1316 try_again:
1317         spin_lock(&nn->nfsd_ssc_lock);
1318         list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1319                 if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
1320                         continue;
1321                 /* found a match */
1322                 if (ni->nsui_busy) {
1323                         /*  wait - and try again */
1324                         prepare_to_wait(&nn->nfsd_ssc_waitq, &wait,
1325                                 TASK_INTERRUPTIBLE);
1326                         spin_unlock(&nn->nfsd_ssc_lock);
1327
1328                         /* allow 20secs for mount/unmount for now - revisit */
1329                         if (signal_pending(current) ||
1330                                         (schedule_timeout(20*HZ) == 0)) {
1331                                 kfree(work);
1332                                 return nfserr_eagain;
1333                         }
1334                         finish_wait(&nn->nfsd_ssc_waitq, &wait);
1335                         goto try_again;
1336                 }
1337                 *ss_mnt = ni->nsui_vfsmount;
1338                 refcount_inc(&ni->nsui_refcnt);
1339                 spin_unlock(&nn->nfsd_ssc_lock);
1340                 kfree(work);
1341
1342                 /* return vfsmount in ss_mnt */
1343                 return 0;
1344         }
1345         if (work) {
1346                 strlcpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr) - 1);
1347                 refcount_set(&work->nsui_refcnt, 2);
1348                 work->nsui_busy = true;
1349                 list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
1350                 *retwork = work;
1351         }
1352         spin_unlock(&nn->nfsd_ssc_lock);
1353         return 0;
1354 }
1355
1356 static void nfsd4_ssc_update_dul_work(struct nfsd_net *nn,
1357                 struct nfsd4_ssc_umount_item *work, struct vfsmount *ss_mnt)
1358 {
1359         /* set nsui_vfsmount, clear busy flag and wakeup waiters */
1360         spin_lock(&nn->nfsd_ssc_lock);
1361         work->nsui_vfsmount = ss_mnt;
1362         work->nsui_busy = false;
1363         wake_up_all(&nn->nfsd_ssc_waitq);
1364         spin_unlock(&nn->nfsd_ssc_lock);
1365 }
1366
1367 static void nfsd4_ssc_cancel_dul_work(struct nfsd_net *nn,
1368                 struct nfsd4_ssc_umount_item *work)
1369 {
1370         spin_lock(&nn->nfsd_ssc_lock);
1371         list_del(&work->nsui_list);
1372         wake_up_all(&nn->nfsd_ssc_waitq);
1373         spin_unlock(&nn->nfsd_ssc_lock);
1374         kfree(work);
1375 }
1376
1377 /*
1378  * Support one copy source server for now.
1379  */
1380 static __be32
1381 nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
1382                        struct vfsmount **mount)
1383 {
1384         struct file_system_type *type;
1385         struct vfsmount *ss_mnt;
1386         struct nfs42_netaddr *naddr;
1387         struct sockaddr_storage tmp_addr;
1388         size_t tmp_addrlen, match_netid_len = 3;
1389         char *startsep = "", *endsep = "", *match_netid = "tcp";
1390         char *ipaddr, *dev_name, *raw_data;
1391         int len, raw_len;
1392         __be32 status = nfserr_inval;
1393         struct nfsd4_ssc_umount_item *work = NULL;
1394         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1395
1396         naddr = &nss->u.nl4_addr;
1397         tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
1398                                          naddr->addr_len,
1399                                          (struct sockaddr *)&tmp_addr,
1400                                          sizeof(tmp_addr));
1401         if (tmp_addrlen == 0)
1402                 goto out_err;
1403
1404         if (tmp_addr.ss_family == AF_INET6) {
1405                 startsep = "[";
1406                 endsep = "]";
1407                 match_netid = "tcp6";
1408                 match_netid_len = 4;
1409         }
1410
1411         if (naddr->netid_len != match_netid_len ||
1412                 strncmp(naddr->netid, match_netid, naddr->netid_len))
1413                 goto out_err;
1414
1415         /* Construct the raw data for the vfs_kern_mount call */
1416         len = RPC_MAX_ADDRBUFLEN + 1;
1417         ipaddr = kzalloc(len, GFP_KERNEL);
1418         if (!ipaddr)
1419                 goto out_err;
1420
1421         rpc_ntop((struct sockaddr *)&tmp_addr, ipaddr, len);
1422
1423         /* 2 for ipv6 endsep and startsep. 3 for ":/" and trailing '/0'*/
1424
1425         raw_len = strlen(NFSD42_INTERSSC_MOUNTOPS) + strlen(ipaddr);
1426         raw_data = kzalloc(raw_len, GFP_KERNEL);
1427         if (!raw_data)
1428                 goto out_free_ipaddr;
1429
1430         snprintf(raw_data, raw_len, NFSD42_INTERSSC_MOUNTOPS, ipaddr);
1431
1432         status = nfserr_nodev;
1433         type = get_fs_type("nfs");
1434         if (!type)
1435                 goto out_free_rawdata;
1436
1437         /* Set the server:<export> for the vfs_kern_mount call */
1438         dev_name = kzalloc(len + 5, GFP_KERNEL);
1439         if (!dev_name)
1440                 goto out_free_rawdata;
1441         snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
1442
1443         status = nfsd4_ssc_setup_dul(nn, ipaddr, &work, &ss_mnt);
1444         if (status)
1445                 goto out_free_devname;
1446         if (ss_mnt)
1447                 goto out_done;
1448
1449         /* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
1450         ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
1451         module_put(type->owner);
1452         if (IS_ERR(ss_mnt)) {
1453                 status = nfserr_nodev;
1454                 if (work)
1455                         nfsd4_ssc_cancel_dul_work(nn, work);
1456                 goto out_free_devname;
1457         }
1458         if (work)
1459                 nfsd4_ssc_update_dul_work(nn, work, ss_mnt);
1460 out_done:
1461         status = 0;
1462         *mount = ss_mnt;
1463
1464 out_free_devname:
1465         kfree(dev_name);
1466 out_free_rawdata:
1467         kfree(raw_data);
1468 out_free_ipaddr:
1469         kfree(ipaddr);
1470 out_err:
1471         return status;
1472 }
1473
1474 static void
1475 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1476 {
1477         nfs_do_sb_deactive(ss_mnt->mnt_sb);
1478         mntput(ss_mnt);
1479 }
1480
1481 /*
1482  * Verify COPY destination stateid.
1483  *
1484  * Connect to the source server with NFSv4.1.
1485  * Create the source struct file for nfsd_copy_range.
1486  * Called with COPY cstate:
1487  *    SAVED_FH: source filehandle
1488  *    CURRENT_FH: destination filehandle
1489  */
1490 static __be32
1491 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1492                       struct nfsd4_compound_state *cstate,
1493                       struct nfsd4_copy *copy, struct vfsmount **mount)
1494 {
1495         struct svc_fh *s_fh = NULL;
1496         stateid_t *s_stid = &copy->cp_src_stateid;
1497         __be32 status = nfserr_inval;
1498
1499         /* Verify the destination stateid and set dst struct file*/
1500         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1501                                             &copy->cp_dst_stateid,
1502                                             WR_STATE, &copy->nf_dst, NULL);
1503         if (status)
1504                 goto out;
1505
1506         status = nfsd4_interssc_connect(copy->cp_src, rqstp, mount);
1507         if (status)
1508                 goto out;
1509
1510         s_fh = &cstate->save_fh;
1511
1512         copy->c_fh.size = s_fh->fh_handle.fh_size;
1513         memcpy(copy->c_fh.data, &s_fh->fh_handle.fh_raw, copy->c_fh.size);
1514         copy->stateid.seqid = cpu_to_be32(s_stid->si_generation);
1515         memcpy(copy->stateid.other, (void *)&s_stid->si_opaque,
1516                sizeof(stateid_opaque_t));
1517
1518         status = 0;
1519 out:
1520         return status;
1521 }
1522
1523 static void
1524 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
1525                         struct nfsd_file *dst)
1526 {
1527         bool found = false;
1528         long timeout;
1529         struct nfsd4_ssc_umount_item *tmp;
1530         struct nfsd4_ssc_umount_item *ni = NULL;
1531         struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
1532
1533         nfs42_ssc_close(filp);
1534         nfsd_file_put(dst);
1535         fput(filp);
1536
1537         if (!nn) {
1538                 mntput(ss_mnt);
1539                 return;
1540         }
1541         spin_lock(&nn->nfsd_ssc_lock);
1542         timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
1543         list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
1544                 if (ni->nsui_vfsmount->mnt_sb == ss_mnt->mnt_sb) {
1545                         list_del(&ni->nsui_list);
1546                         /*
1547                          * vfsmount can be shared by multiple exports,
1548                          * decrement refcnt. If the count drops to 1 it
1549                          * will be unmounted when nsui_expire expires.
1550                          */
1551                         refcount_dec(&ni->nsui_refcnt);
1552                         ni->nsui_expire = jiffies + timeout;
1553                         list_add_tail(&ni->nsui_list, &nn->nfsd_ssc_mount_list);
1554                         found = true;
1555                         break;
1556                 }
1557         }
1558         spin_unlock(&nn->nfsd_ssc_lock);
1559         if (!found) {
1560                 mntput(ss_mnt);
1561                 return;
1562         }
1563 }
1564
1565 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
1566
1567 static __be32
1568 nfsd4_setup_inter_ssc(struct svc_rqst *rqstp,
1569                       struct nfsd4_compound_state *cstate,
1570                       struct nfsd4_copy *copy,
1571                       struct vfsmount **mount)
1572 {
1573         *mount = NULL;
1574         return nfserr_inval;
1575 }
1576
1577 static void
1578 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct file *filp,
1579                         struct nfsd_file *dst)
1580 {
1581 }
1582
1583 static void
1584 nfsd4_interssc_disconnect(struct vfsmount *ss_mnt)
1585 {
1586 }
1587
1588 static struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
1589                                    struct nfs_fh *src_fh,
1590                                    nfs4_stateid *stateid)
1591 {
1592         return NULL;
1593 }
1594 #endif /* CONFIG_NFSD_V4_2_INTER_SSC */
1595
1596 static __be32
1597 nfsd4_setup_intra_ssc(struct svc_rqst *rqstp,
1598                       struct nfsd4_compound_state *cstate,
1599                       struct nfsd4_copy *copy)
1600 {
1601         return nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid,
1602                                  &copy->nf_src, &copy->cp_dst_stateid,
1603                                  &copy->nf_dst);
1604 }
1605
1606 static void
1607 nfsd4_cleanup_intra_ssc(struct nfsd_file *src, struct nfsd_file *dst)
1608 {
1609         nfsd_file_put(src);
1610         nfsd_file_put(dst);
1611 }
1612
1613 static void nfsd4_cb_offload_release(struct nfsd4_callback *cb)
1614 {
1615         struct nfsd4_cb_offload *cbo =
1616                 container_of(cb, struct nfsd4_cb_offload, co_cb);
1617
1618         kfree(cbo);
1619 }
1620
1621 static int nfsd4_cb_offload_done(struct nfsd4_callback *cb,
1622                                  struct rpc_task *task)
1623 {
1624         return 1;
1625 }
1626
1627 static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
1628         .release = nfsd4_cb_offload_release,
1629         .done = nfsd4_cb_offload_done
1630 };
1631
1632 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
1633 {
1634         copy->cp_res.wr_stable_how =
1635                 test_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags) ?
1636                         NFS_FILE_SYNC : NFS_UNSTABLE;
1637         nfsd4_copy_set_sync(copy, sync);
1638         gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
1639 }
1640
1641 static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy,
1642                                      struct file *dst,
1643                                      struct file *src)
1644 {
1645         errseq_t since;
1646         ssize_t bytes_copied = 0;
1647         u64 bytes_total = copy->cp_count;
1648         u64 src_pos = copy->cp_src_pos;
1649         u64 dst_pos = copy->cp_dst_pos;
1650         int status;
1651
1652         /* See RFC 7862 p.67: */
1653         if (bytes_total == 0)
1654                 bytes_total = ULLONG_MAX;
1655         do {
1656                 if (kthread_should_stop())
1657                         break;
1658                 bytes_copied = nfsd_copy_file_range(src, src_pos, dst, dst_pos,
1659                                                     bytes_total);
1660                 if (bytes_copied <= 0)
1661                         break;
1662                 bytes_total -= bytes_copied;
1663                 copy->cp_res.wr_bytes_written += bytes_copied;
1664                 src_pos += bytes_copied;
1665                 dst_pos += bytes_copied;
1666         } while (bytes_total > 0 && nfsd4_copy_is_async(copy));
1667         /* for a non-zero asynchronous copy do a commit of data */
1668         if (nfsd4_copy_is_async(copy) && copy->cp_res.wr_bytes_written > 0) {
1669                 since = READ_ONCE(dst->f_wb_err);
1670                 status = vfs_fsync_range(dst, copy->cp_dst_pos,
1671                                          copy->cp_res.wr_bytes_written, 0);
1672                 if (!status)
1673                         status = filemap_check_wb_err(dst->f_mapping, since);
1674                 if (!status)
1675                         set_bit(NFSD4_COPY_F_COMMITTED, &copy->cp_flags);
1676         }
1677         return bytes_copied;
1678 }
1679
1680 static __be32 nfsd4_do_copy(struct nfsd4_copy *copy,
1681                             struct file *src, struct file *dst,
1682                             bool sync)
1683 {
1684         __be32 status;
1685         ssize_t bytes;
1686
1687         bytes = _nfsd_copy_file_range(copy, dst, src);
1688
1689         /* for async copy, we ignore the error, client can always retry
1690          * to get the error
1691          */
1692         if (bytes < 0 && !copy->cp_res.wr_bytes_written)
1693                 status = nfserrno(bytes);
1694         else {
1695                 nfsd4_init_copy_res(copy, sync);
1696                 status = nfs_ok;
1697         }
1698         return status;
1699 }
1700
1701 static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst)
1702 {
1703         dst->cp_src_pos = src->cp_src_pos;
1704         dst->cp_dst_pos = src->cp_dst_pos;
1705         dst->cp_count = src->cp_count;
1706         dst->cp_flags = src->cp_flags;
1707         memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res));
1708         memcpy(&dst->fh, &src->fh, sizeof(src->fh));
1709         dst->cp_clp = src->cp_clp;
1710         dst->nf_dst = nfsd_file_get(src->nf_dst);
1711         /* for inter, nf_src doesn't exist yet */
1712         if (!nfsd4_ssc_is_inter(src))
1713                 dst->nf_src = nfsd_file_get(src->nf_src);
1714
1715         memcpy(&dst->cp_stateid, &src->cp_stateid, sizeof(src->cp_stateid));
1716         memcpy(dst->cp_src, src->cp_src, sizeof(struct nl4_server));
1717         memcpy(&dst->stateid, &src->stateid, sizeof(src->stateid));
1718         memcpy(&dst->c_fh, &src->c_fh, sizeof(src->c_fh));
1719         dst->ss_mnt = src->ss_mnt;
1720 }
1721
1722 static void cleanup_async_copy(struct nfsd4_copy *copy)
1723 {
1724         nfs4_free_copy_state(copy);
1725         nfsd_file_put(copy->nf_dst);
1726         if (!nfsd4_ssc_is_inter(copy))
1727                 nfsd_file_put(copy->nf_src);
1728         spin_lock(&copy->cp_clp->async_lock);
1729         list_del(&copy->copies);
1730         spin_unlock(&copy->cp_clp->async_lock);
1731         nfs4_put_copy(copy);
1732 }
1733
1734 static void nfsd4_send_cb_offload(struct nfsd4_copy *copy, __be32 nfserr)
1735 {
1736         struct nfsd4_cb_offload *cbo;
1737
1738         cbo = kzalloc(sizeof(*cbo), GFP_KERNEL);
1739         if (!cbo)
1740                 return;
1741
1742         memcpy(&cbo->co_res, &copy->cp_res, sizeof(copy->cp_res));
1743         memcpy(&cbo->co_fh, &copy->fh, sizeof(copy->fh));
1744         cbo->co_nfserr = nfserr;
1745
1746         nfsd4_init_cb(&cbo->co_cb, copy->cp_clp, &nfsd4_cb_offload_ops,
1747                       NFSPROC4_CLNT_CB_OFFLOAD);
1748         trace_nfsd_cb_offload(copy->cp_clp, &cbo->co_res.cb_stateid,
1749                               &cbo->co_fh, copy->cp_count, nfserr);
1750         nfsd4_run_cb(&cbo->co_cb);
1751 }
1752
1753 /**
1754  * nfsd4_do_async_copy - kthread function for background server-side COPY
1755  * @data: arguments for COPY operation
1756  *
1757  * Return values:
1758  *   %0: Copy operation is done.
1759  */
1760 static int nfsd4_do_async_copy(void *data)
1761 {
1762         struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
1763         __be32 nfserr;
1764
1765         if (nfsd4_ssc_is_inter(copy)) {
1766                 struct file *filp;
1767
1768                 filp = nfs42_ssc_open(copy->ss_mnt, &copy->c_fh,
1769                                       &copy->stateid);
1770                 if (IS_ERR(filp)) {
1771                         nfserr = nfserr_offload_denied;
1772                         nfsd4_interssc_disconnect(copy->ss_mnt);
1773                         goto do_callback;
1774                 }
1775                 nfserr = nfsd4_do_copy(copy, filp, copy->nf_dst->nf_file,
1776                                        false);
1777                 nfsd4_cleanup_inter_ssc(copy->ss_mnt, filp, copy->nf_dst);
1778         } else {
1779                 nfserr = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1780                                        copy->nf_dst->nf_file, false);
1781                 nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1782         }
1783
1784 do_callback:
1785         nfsd4_send_cb_offload(copy, nfserr);
1786         cleanup_async_copy(copy);
1787         return 0;
1788 }
1789
1790 static __be32
1791 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1792                 union nfsd4_op_u *u)
1793 {
1794         struct nfsd4_copy *copy = &u->copy;
1795         __be32 status;
1796         struct nfsd4_copy *async_copy = NULL;
1797
1798         if (nfsd4_ssc_is_inter(copy)) {
1799                 if (!inter_copy_offload_enable || nfsd4_copy_is_sync(copy)) {
1800                         status = nfserr_notsupp;
1801                         goto out;
1802                 }
1803                 status = nfsd4_setup_inter_ssc(rqstp, cstate, copy,
1804                                 &copy->ss_mnt);
1805                 if (status)
1806                         return nfserr_offload_denied;
1807         } else {
1808                 status = nfsd4_setup_intra_ssc(rqstp, cstate, copy);
1809                 if (status)
1810                         return status;
1811         }
1812
1813         copy->cp_clp = cstate->clp;
1814         memcpy(&copy->fh, &cstate->current_fh.fh_handle,
1815                 sizeof(struct knfsd_fh));
1816         if (nfsd4_copy_is_async(copy)) {
1817                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1818
1819                 status = nfserrno(-ENOMEM);
1820                 async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
1821                 if (!async_copy)
1822                         goto out_err;
1823                 async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
1824                 if (!async_copy->cp_src)
1825                         goto out_err;
1826                 if (!nfs4_init_copy_state(nn, copy))
1827                         goto out_err;
1828                 refcount_set(&async_copy->refcount, 1);
1829                 memcpy(&copy->cp_res.cb_stateid, &copy->cp_stateid.stid,
1830                         sizeof(copy->cp_res.cb_stateid));
1831                 dup_copy_fields(copy, async_copy);
1832                 async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
1833                                 async_copy, "%s", "copy thread");
1834                 if (IS_ERR(async_copy->copy_task))
1835                         goto out_err;
1836                 spin_lock(&async_copy->cp_clp->async_lock);
1837                 list_add(&async_copy->copies,
1838                                 &async_copy->cp_clp->async_copies);
1839                 spin_unlock(&async_copy->cp_clp->async_lock);
1840                 wake_up_process(async_copy->copy_task);
1841                 status = nfs_ok;
1842         } else {
1843                 status = nfsd4_do_copy(copy, copy->nf_src->nf_file,
1844                                        copy->nf_dst->nf_file, true);
1845                 nfsd4_cleanup_intra_ssc(copy->nf_src, copy->nf_dst);
1846         }
1847 out:
1848         return status;
1849 out_err:
1850         if (async_copy)
1851                 cleanup_async_copy(async_copy);
1852         status = nfserrno(-ENOMEM);
1853         if (nfsd4_ssc_is_inter(copy))
1854                 nfsd4_interssc_disconnect(copy->ss_mnt);
1855         goto out;
1856 }
1857
1858 struct nfsd4_copy *
1859 find_async_copy(struct nfs4_client *clp, stateid_t *stateid)
1860 {
1861         struct nfsd4_copy *copy;
1862
1863         spin_lock(&clp->async_lock);
1864         list_for_each_entry(copy, &clp->async_copies, copies) {
1865                 if (memcmp(&copy->cp_stateid.stid, stateid, NFS4_STATEID_SIZE))
1866                         continue;
1867                 refcount_inc(&copy->refcount);
1868                 spin_unlock(&clp->async_lock);
1869                 return copy;
1870         }
1871         spin_unlock(&clp->async_lock);
1872         return NULL;
1873 }
1874
1875 static __be32
1876 nfsd4_offload_cancel(struct svc_rqst *rqstp,
1877                      struct nfsd4_compound_state *cstate,
1878                      union nfsd4_op_u *u)
1879 {
1880         struct nfsd4_offload_status *os = &u->offload_status;
1881         struct nfsd4_copy *copy;
1882         struct nfs4_client *clp = cstate->clp;
1883
1884         copy = find_async_copy(clp, &os->stateid);
1885         if (!copy) {
1886                 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1887
1888                 return manage_cpntf_state(nn, &os->stateid, clp, NULL);
1889         } else
1890                 nfsd4_stop_copy(copy);
1891
1892         return nfs_ok;
1893 }
1894
1895 static __be32
1896 nfsd4_copy_notify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1897                   union nfsd4_op_u *u)
1898 {
1899         struct nfsd4_copy_notify *cn = &u->copy_notify;
1900         __be32 status;
1901         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1902         struct nfs4_stid *stid;
1903         struct nfs4_cpntf_state *cps;
1904         struct nfs4_client *clp = cstate->clp;
1905
1906         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1907                                         &cn->cpn_src_stateid, RD_STATE, NULL,
1908                                         &stid);
1909         if (status)
1910                 return status;
1911
1912         cn->cpn_sec = nn->nfsd4_lease;
1913         cn->cpn_nsec = 0;
1914
1915         status = nfserrno(-ENOMEM);
1916         cps = nfs4_alloc_init_cpntf_state(nn, stid);
1917         if (!cps)
1918                 goto out;
1919         memcpy(&cn->cpn_cnr_stateid, &cps->cp_stateid.stid, sizeof(stateid_t));
1920         memcpy(&cps->cp_p_stateid, &stid->sc_stateid, sizeof(stateid_t));
1921         memcpy(&cps->cp_p_clid, &clp->cl_clientid, sizeof(clientid_t));
1922
1923         /* For now, only return one server address in cpn_src, the
1924          * address used by the client to connect to this server.
1925          */
1926         cn->cpn_src->nl4_type = NL4_NETADDR;
1927         status = nfsd4_set_netaddr((struct sockaddr *)&rqstp->rq_daddr,
1928                                  &cn->cpn_src->u.nl4_addr);
1929         WARN_ON_ONCE(status);
1930         if (status) {
1931                 nfs4_put_cpntf_state(nn, cps);
1932                 goto out;
1933         }
1934 out:
1935         nfs4_put_stid(stid);
1936         return status;
1937 }
1938
1939 static __be32
1940 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1941                 struct nfsd4_fallocate *fallocate, int flags)
1942 {
1943         __be32 status;
1944         struct nfsd_file *nf;
1945
1946         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1947                                             &fallocate->falloc_stateid,
1948                                             WR_STATE, &nf, NULL);
1949         if (status != nfs_ok) {
1950                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1951                 return status;
1952         }
1953
1954         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, nf->nf_file,
1955                                      fallocate->falloc_offset,
1956                                      fallocate->falloc_length,
1957                                      flags);
1958         nfsd_file_put(nf);
1959         return status;
1960 }
1961 static __be32
1962 nfsd4_offload_status(struct svc_rqst *rqstp,
1963                      struct nfsd4_compound_state *cstate,
1964                      union nfsd4_op_u *u)
1965 {
1966         struct nfsd4_offload_status *os = &u->offload_status;
1967         __be32 status = 0;
1968         struct nfsd4_copy *copy;
1969         struct nfs4_client *clp = cstate->clp;
1970
1971         copy = find_async_copy(clp, &os->stateid);
1972         if (copy) {
1973                 os->count = copy->cp_res.wr_bytes_written;
1974                 nfs4_put_copy(copy);
1975         } else
1976                 status = nfserr_bad_stateid;
1977
1978         return status;
1979 }
1980
1981 static __be32
1982 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1983                union nfsd4_op_u *u)
1984 {
1985         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1986 }
1987
1988 static __be32
1989 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1990                  union nfsd4_op_u *u)
1991 {
1992         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1993                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1994 }
1995
1996 static __be32
1997 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1998            union nfsd4_op_u *u)
1999 {
2000         struct nfsd4_seek *seek = &u->seek;
2001         int whence;
2002         __be32 status;
2003         struct nfsd_file *nf;
2004
2005         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
2006                                             &seek->seek_stateid,
2007                                             RD_STATE, &nf, NULL);
2008         if (status) {
2009                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
2010                 return status;
2011         }
2012
2013         switch (seek->seek_whence) {
2014         case NFS4_CONTENT_DATA:
2015                 whence = SEEK_DATA;
2016                 break;
2017         case NFS4_CONTENT_HOLE:
2018                 whence = SEEK_HOLE;
2019                 break;
2020         default:
2021                 status = nfserr_union_notsupp;
2022                 goto out;
2023         }
2024
2025         /*
2026          * Note:  This call does change file->f_pos, but nothing in NFSD
2027          *        should ever file->f_pos.
2028          */
2029         seek->seek_pos = vfs_llseek(nf->nf_file, seek->seek_offset, whence);
2030         if (seek->seek_pos < 0)
2031                 status = nfserrno(seek->seek_pos);
2032         else if (seek->seek_pos >= i_size_read(file_inode(nf->nf_file)))
2033                 seek->seek_eof = true;
2034
2035 out:
2036         nfsd_file_put(nf);
2037         return status;
2038 }
2039
2040 /* This routine never returns NFS_OK!  If there are no other errors, it
2041  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
2042  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
2043  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
2044  */
2045 static __be32
2046 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2047              struct nfsd4_verify *verify)
2048 {
2049         __be32 *buf, *p;
2050         int count;
2051         __be32 status;
2052
2053         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
2054         if (status)
2055                 return status;
2056
2057         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
2058         if (status)
2059                 return status;
2060
2061         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
2062             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
2063                 return nfserr_inval;
2064         if (verify->ve_attrlen & 3)
2065                 return nfserr_inval;
2066
2067         /* count in words:
2068          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
2069          */
2070         count = 4 + (verify->ve_attrlen >> 2);
2071         buf = kmalloc(count << 2, GFP_KERNEL);
2072         if (!buf)
2073                 return nfserr_jukebox;
2074
2075         p = buf;
2076         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
2077                                     cstate->current_fh.fh_export,
2078                                     cstate->current_fh.fh_dentry,
2079                                     verify->ve_bmval,
2080                                     rqstp, 0);
2081         /*
2082          * If nfsd4_encode_fattr() ran out of space, assume that's because
2083          * the attributes are longer (hence different) than those given:
2084          */
2085         if (status == nfserr_resource)
2086                 status = nfserr_not_same;
2087         if (status)
2088                 goto out_kfree;
2089
2090         /* skip bitmap */
2091         p = buf + 1 + ntohl(buf[0]);
2092         status = nfserr_not_same;
2093         if (ntohl(*p++) != verify->ve_attrlen)
2094                 goto out_kfree;
2095         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
2096                 status = nfserr_same;
2097
2098 out_kfree:
2099         kfree(buf);
2100         return status;
2101 }
2102
2103 static __be32
2104 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2105               union nfsd4_op_u *u)
2106 {
2107         __be32 status;
2108
2109         status = _nfsd4_verify(rqstp, cstate, &u->verify);
2110         return status == nfserr_not_same ? nfs_ok : status;
2111 }
2112
2113 static __be32
2114 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2115              union nfsd4_op_u *u)
2116 {
2117         __be32 status;
2118
2119         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
2120         return status == nfserr_same ? nfs_ok : status;
2121 }
2122
2123 #ifdef CONFIG_NFSD_PNFS
2124 static const struct nfsd4_layout_ops *
2125 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
2126 {
2127         if (!exp->ex_layout_types) {
2128                 dprintk("%s: export does not support pNFS\n", __func__);
2129                 return NULL;
2130         }
2131
2132         if (layout_type >= LAYOUT_TYPE_MAX ||
2133             !(exp->ex_layout_types & (1 << layout_type))) {
2134                 dprintk("%s: layout type %d not supported\n",
2135                         __func__, layout_type);
2136                 return NULL;
2137         }
2138
2139         return nfsd4_layout_ops[layout_type];
2140 }
2141
2142 static __be32
2143 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
2144                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2145 {
2146         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
2147         const struct nfsd4_layout_ops *ops;
2148         struct nfsd4_deviceid_map *map;
2149         struct svc_export *exp;
2150         __be32 nfserr;
2151
2152         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
2153                __func__,
2154                gdp->gd_layout_type,
2155                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
2156                gdp->gd_maxcount);
2157
2158         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
2159         if (!map) {
2160                 dprintk("%s: couldn't find device ID to export mapping!\n",
2161                         __func__);
2162                 return nfserr_noent;
2163         }
2164
2165         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
2166         if (IS_ERR(exp)) {
2167                 dprintk("%s: could not find device id\n", __func__);
2168                 return nfserr_noent;
2169         }
2170
2171         nfserr = nfserr_layoutunavailable;
2172         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
2173         if (!ops)
2174                 goto out;
2175
2176         nfserr = nfs_ok;
2177         if (gdp->gd_maxcount != 0) {
2178                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
2179                                 rqstp, cstate->clp, gdp);
2180         }
2181
2182         gdp->gd_notify_types &= ops->notify_types;
2183 out:
2184         exp_put(exp);
2185         return nfserr;
2186 }
2187
2188 static void
2189 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
2190 {
2191         kfree(u->getdeviceinfo.gd_device);
2192 }
2193
2194 static __be32
2195 nfsd4_layoutget(struct svc_rqst *rqstp,
2196                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2197 {
2198         struct nfsd4_layoutget *lgp = &u->layoutget;
2199         struct svc_fh *current_fh = &cstate->current_fh;
2200         const struct nfsd4_layout_ops *ops;
2201         struct nfs4_layout_stateid *ls;
2202         __be32 nfserr;
2203         int accmode = NFSD_MAY_READ_IF_EXEC;
2204
2205         switch (lgp->lg_seg.iomode) {
2206         case IOMODE_READ:
2207                 accmode |= NFSD_MAY_READ;
2208                 break;
2209         case IOMODE_RW:
2210                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
2211                 break;
2212         default:
2213                 dprintk("%s: invalid iomode %d\n",
2214                         __func__, lgp->lg_seg.iomode);
2215                 nfserr = nfserr_badiomode;
2216                 goto out;
2217         }
2218
2219         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
2220         if (nfserr)
2221                 goto out;
2222
2223         nfserr = nfserr_layoutunavailable;
2224         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
2225         if (!ops)
2226                 goto out;
2227
2228         /*
2229          * Verify minlength and range as per RFC5661:
2230          *  o  If loga_length is less than loga_minlength,
2231          *     the metadata server MUST return NFS4ERR_INVAL.
2232          *  o  If the sum of loga_offset and loga_minlength exceeds
2233          *     NFS4_UINT64_MAX, and loga_minlength is not
2234          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
2235          *  o  If the sum of loga_offset and loga_length exceeds
2236          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
2237          *     the error NFS4ERR_INVAL MUST result.
2238          */
2239         nfserr = nfserr_inval;
2240         if (lgp->lg_seg.length < lgp->lg_minlength ||
2241             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
2242              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
2243             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
2244              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
2245                 goto out;
2246         if (lgp->lg_seg.length == 0)
2247                 goto out;
2248
2249         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
2250                                                 true, lgp->lg_layout_type, &ls);
2251         if (nfserr) {
2252                 trace_nfsd_layout_get_lookup_fail(&lgp->lg_sid);
2253                 goto out;
2254         }
2255
2256         nfserr = nfserr_recallconflict;
2257         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
2258                 goto out_put_stid;
2259
2260         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
2261                                      current_fh, lgp);
2262         if (nfserr)
2263                 goto out_put_stid;
2264
2265         nfserr = nfsd4_insert_layout(lgp, ls);
2266
2267 out_put_stid:
2268         mutex_unlock(&ls->ls_mutex);
2269         nfs4_put_stid(&ls->ls_stid);
2270 out:
2271         return nfserr;
2272 }
2273
2274 static void
2275 nfsd4_layoutget_release(union nfsd4_op_u *u)
2276 {
2277         kfree(u->layoutget.lg_content);
2278 }
2279
2280 static __be32
2281 nfsd4_layoutcommit(struct svc_rqst *rqstp,
2282                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2283 {
2284         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
2285         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
2286         struct svc_fh *current_fh = &cstate->current_fh;
2287         const struct nfsd4_layout_ops *ops;
2288         loff_t new_size = lcp->lc_last_wr + 1;
2289         struct inode *inode;
2290         struct nfs4_layout_stateid *ls;
2291         __be32 nfserr;
2292
2293         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
2294         if (nfserr)
2295                 goto out;
2296
2297         nfserr = nfserr_layoutunavailable;
2298         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
2299         if (!ops)
2300                 goto out;
2301         inode = d_inode(current_fh->fh_dentry);
2302
2303         nfserr = nfserr_inval;
2304         if (new_size <= seg->offset) {
2305                 dprintk("pnfsd: last write before layout segment\n");
2306                 goto out;
2307         }
2308         if (new_size > seg->offset + seg->length) {
2309                 dprintk("pnfsd: last write beyond layout segment\n");
2310                 goto out;
2311         }
2312         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
2313                 dprintk("pnfsd: layoutcommit beyond EOF\n");
2314                 goto out;
2315         }
2316
2317         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
2318                                                 false, lcp->lc_layout_type,
2319                                                 &ls);
2320         if (nfserr) {
2321                 trace_nfsd_layout_commit_lookup_fail(&lcp->lc_sid);
2322                 /* fixup error code as per RFC5661 */
2323                 if (nfserr == nfserr_bad_stateid)
2324                         nfserr = nfserr_badlayout;
2325                 goto out;
2326         }
2327
2328         /* LAYOUTCOMMIT does not require any serialization */
2329         mutex_unlock(&ls->ls_mutex);
2330
2331         if (new_size > i_size_read(inode)) {
2332                 lcp->lc_size_chg = 1;
2333                 lcp->lc_newsize = new_size;
2334         } else {
2335                 lcp->lc_size_chg = 0;
2336         }
2337
2338         nfserr = ops->proc_layoutcommit(inode, lcp);
2339         nfs4_put_stid(&ls->ls_stid);
2340 out:
2341         return nfserr;
2342 }
2343
2344 static __be32
2345 nfsd4_layoutreturn(struct svc_rqst *rqstp,
2346                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2347 {
2348         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
2349         struct svc_fh *current_fh = &cstate->current_fh;
2350         __be32 nfserr;
2351
2352         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
2353         if (nfserr)
2354                 goto out;
2355
2356         nfserr = nfserr_layoutunavailable;
2357         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
2358                 goto out;
2359
2360         switch (lrp->lr_seg.iomode) {
2361         case IOMODE_READ:
2362         case IOMODE_RW:
2363         case IOMODE_ANY:
2364                 break;
2365         default:
2366                 dprintk("%s: invalid iomode %d\n", __func__,
2367                         lrp->lr_seg.iomode);
2368                 nfserr = nfserr_inval;
2369                 goto out;
2370         }
2371
2372         switch (lrp->lr_return_type) {
2373         case RETURN_FILE:
2374                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
2375                 break;
2376         case RETURN_FSID:
2377         case RETURN_ALL:
2378                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
2379                 break;
2380         default:
2381                 dprintk("%s: invalid return_type %d\n", __func__,
2382                         lrp->lr_return_type);
2383                 nfserr = nfserr_inval;
2384                 break;
2385         }
2386 out:
2387         return nfserr;
2388 }
2389 #endif /* CONFIG_NFSD_PNFS */
2390
2391 static __be32
2392 nfsd4_getxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2393                union nfsd4_op_u *u)
2394 {
2395         struct nfsd4_getxattr *getxattr = &u->getxattr;
2396
2397         return nfsd_getxattr(rqstp, &cstate->current_fh,
2398                              getxattr->getxa_name, &getxattr->getxa_buf,
2399                              &getxattr->getxa_len);
2400 }
2401
2402 static __be32
2403 nfsd4_setxattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2404            union nfsd4_op_u *u)
2405 {
2406         struct nfsd4_setxattr *setxattr = &u->setxattr;
2407         __be32 ret;
2408
2409         if (opens_in_grace(SVC_NET(rqstp)))
2410                 return nfserr_grace;
2411
2412         ret = nfsd_setxattr(rqstp, &cstate->current_fh, setxattr->setxa_name,
2413                             setxattr->setxa_buf, setxattr->setxa_len,
2414                             setxattr->setxa_flags);
2415
2416         if (!ret)
2417                 set_change_info(&setxattr->setxa_cinfo, &cstate->current_fh);
2418
2419         return ret;
2420 }
2421
2422 static __be32
2423 nfsd4_listxattrs(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2424            union nfsd4_op_u *u)
2425 {
2426         /*
2427          * Get the entire list, then copy out only the user attributes
2428          * in the encode function.
2429          */
2430         return nfsd_listxattr(rqstp, &cstate->current_fh,
2431                              &u->listxattrs.lsxa_buf, &u->listxattrs.lsxa_len);
2432 }
2433
2434 static __be32
2435 nfsd4_removexattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2436            union nfsd4_op_u *u)
2437 {
2438         struct nfsd4_removexattr *removexattr = &u->removexattr;
2439         __be32 ret;
2440
2441         if (opens_in_grace(SVC_NET(rqstp)))
2442                 return nfserr_grace;
2443
2444         ret = nfsd_removexattr(rqstp, &cstate->current_fh,
2445             removexattr->rmxa_name);
2446
2447         if (!ret)
2448                 set_change_info(&removexattr->rmxa_cinfo, &cstate->current_fh);
2449
2450         return ret;
2451 }
2452
2453 /*
2454  * NULL call.
2455  */
2456 static __be32
2457 nfsd4_proc_null(struct svc_rqst *rqstp)
2458 {
2459         return rpc_success;
2460 }
2461
2462 static inline void nfsd4_increment_op_stats(u32 opnum)
2463 {
2464         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
2465                 percpu_counter_inc(&nfsdstats.counter[NFSD_STATS_NFS4_OP(opnum)]);
2466 }
2467
2468 static const struct nfsd4_operation nfsd4_ops[];
2469
2470 static const char *nfsd4_op_name(unsigned opnum);
2471
2472 /*
2473  * Enforce NFSv4.1 COMPOUND ordering rules:
2474  *
2475  * Also note, enforced elsewhere:
2476  *      - SEQUENCE other than as first op results in
2477  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
2478  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
2479  *        (Enforced in nfsd4_bind_conn_to_session().)
2480  *      - DESTROY_SESSION must be the final operation in a compound, if
2481  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
2482  *        (Enforced in nfsd4_destroy_session().)
2483  */
2484 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
2485 {
2486         struct nfsd4_op *first_op = &args->ops[0];
2487
2488         /* These ordering requirements don't apply to NFSv4.0: */
2489         if (args->minorversion == 0)
2490                 return nfs_ok;
2491         /* This is weird, but OK, not our problem: */
2492         if (args->opcnt == 0)
2493                 return nfs_ok;
2494         if (first_op->status == nfserr_op_illegal)
2495                 return nfs_ok;
2496         if (!(nfsd4_ops[first_op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
2497                 return nfserr_op_not_in_session;
2498         if (first_op->opnum == OP_SEQUENCE)
2499                 return nfs_ok;
2500         /*
2501          * So first_op is something allowed outside a session, like
2502          * EXCHANGE_ID; but then it has to be the only op in the
2503          * compound:
2504          */
2505         if (args->opcnt != 1)
2506                 return nfserr_not_only_op;
2507         return nfs_ok;
2508 }
2509
2510 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
2511 {
2512         return &nfsd4_ops[op->opnum];
2513 }
2514
2515 bool nfsd4_cache_this_op(struct nfsd4_op *op)
2516 {
2517         if (op->opnum == OP_ILLEGAL)
2518                 return false;
2519         return OPDESC(op)->op_flags & OP_CACHEME;
2520 }
2521
2522 static bool need_wrongsec_check(struct svc_rqst *rqstp)
2523 {
2524         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2525         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2526         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2527         struct nfsd4_op *next = &argp->ops[resp->opcnt];
2528         const struct nfsd4_operation *thisd = OPDESC(this);
2529         const struct nfsd4_operation *nextd;
2530
2531         /*
2532          * Most ops check wronsec on our own; only the putfh-like ops
2533          * have special rules.
2534          */
2535         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
2536                 return false;
2537         /*
2538          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
2539          * put-filehandle operation if we're not going to use the
2540          * result:
2541          */
2542         if (argp->opcnt == resp->opcnt)
2543                 return false;
2544         if (next->opnum == OP_ILLEGAL)
2545                 return false;
2546         nextd = OPDESC(next);
2547         /*
2548          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
2549          * errors themselves as necessary; others should check for them
2550          * now:
2551          */
2552         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
2553 }
2554
2555 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
2556 static void
2557 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2558 {
2559         struct nfsd4_op *op, *current_op = NULL, *saved_op = NULL;
2560         struct nfsd4_copy *copy;
2561         struct nfsd4_putfh *putfh;
2562         int i;
2563
2564         /* traverse all operation and if it's a COPY compound, mark the
2565          * source filehandle to skip verification
2566          */
2567         for (i = 0; i < args->opcnt; i++) {
2568                 op = &args->ops[i];
2569                 if (op->opnum == OP_PUTFH)
2570                         current_op = op;
2571                 else if (op->opnum == OP_SAVEFH)
2572                         saved_op = current_op;
2573                 else if (op->opnum == OP_RESTOREFH)
2574                         current_op = saved_op;
2575                 else if (op->opnum == OP_COPY) {
2576                         copy = (struct nfsd4_copy *)&op->u;
2577                         if (!saved_op) {
2578                                 op->status = nfserr_nofilehandle;
2579                                 return;
2580                         }
2581                         putfh = (struct nfsd4_putfh *)&saved_op->u;
2582                         if (nfsd4_ssc_is_inter(copy))
2583                                 putfh->no_verify = true;
2584                 }
2585         }
2586 }
2587 #else
2588 static void
2589 check_if_stalefh_allowed(struct nfsd4_compoundargs *args)
2590 {
2591 }
2592 #endif
2593
2594 /*
2595  * COMPOUND call.
2596  */
2597 static __be32
2598 nfsd4_proc_compound(struct svc_rqst *rqstp)
2599 {
2600         struct nfsd4_compoundargs *args = rqstp->rq_argp;
2601         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2602         struct nfsd4_op *op;
2603         struct nfsd4_compound_state *cstate = &resp->cstate;
2604         struct svc_fh *current_fh = &cstate->current_fh;
2605         struct svc_fh *save_fh = &cstate->save_fh;
2606         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2607         __be32          status;
2608
2609         resp->xdr = &rqstp->rq_res_stream;
2610         resp->statusp = resp->xdr->p;
2611
2612         /* reserve space for: NFS status code */
2613         xdr_reserve_space(resp->xdr, XDR_UNIT);
2614
2615         /* reserve space for: taglen, tag, and opcnt */
2616         xdr_reserve_space(resp->xdr, XDR_UNIT * 2 + args->taglen);
2617         resp->taglen = args->taglen;
2618         resp->tag = args->tag;
2619         resp->rqstp = rqstp;
2620         cstate->minorversion = args->minorversion;
2621         fh_init(current_fh, NFS4_FHSIZE);
2622         fh_init(save_fh, NFS4_FHSIZE);
2623
2624         /*
2625          * Don't use the deferral mechanism for NFSv4; compounds make it
2626          * too hard to avoid non-idempotency problems.
2627          */
2628         __clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2629
2630         /*
2631          * According to RFC3010, this takes precedence over all other errors.
2632          */
2633         status = nfserr_minor_vers_mismatch;
2634         if (nfsd_minorversion(nn, args->minorversion, NFSD_TEST) <= 0)
2635                 goto out;
2636         status = nfserr_resource;
2637         if (args->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
2638                 goto out;
2639
2640         status = nfs41_check_op_ordering(args);
2641         if (status) {
2642                 op = &args->ops[0];
2643                 op->status = status;
2644                 resp->opcnt = 1;
2645                 goto encode_op;
2646         }
2647         check_if_stalefh_allowed(args);
2648
2649         rqstp->rq_lease_breaker = (void **)&cstate->clp;
2650
2651         trace_nfsd_compound(rqstp, args->opcnt);
2652         while (!status && resp->opcnt < args->opcnt) {
2653                 op = &args->ops[resp->opcnt++];
2654
2655                 /*
2656                  * The XDR decode routines may have pre-set op->status;
2657                  * for example, if there is a miscellaneous XDR error
2658                  * it will be set to nfserr_bad_xdr.
2659                  */
2660                 if (op->status) {
2661                         if (op->opnum == OP_OPEN)
2662                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
2663                         goto encode_op;
2664                 }
2665                 if (!current_fh->fh_dentry &&
2666                                 !HAS_FH_FLAG(current_fh, NFSD4_FH_FOREIGN)) {
2667                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
2668                                 op->status = nfserr_nofilehandle;
2669                                 goto encode_op;
2670                         }
2671                 } else if (current_fh->fh_export &&
2672                            current_fh->fh_export->ex_fslocs.migrated &&
2673                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
2674                         op->status = nfserr_moved;
2675                         goto encode_op;
2676                 }
2677
2678                 fh_clear_pre_post_attrs(current_fh);
2679
2680                 /* If op is non-idempotent */
2681                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
2682                         /*
2683                          * Don't execute this op if we couldn't encode a
2684                          * successful reply:
2685                          */
2686                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
2687                         /*
2688                          * Plus if there's another operation, make sure
2689                          * we'll have space to at least encode an error:
2690                          */
2691                         if (resp->opcnt < args->opcnt)
2692                                 plen += COMPOUND_ERR_SLACK_SPACE;
2693                         op->status = nfsd4_check_resp_size(resp, plen);
2694                 }
2695
2696                 if (op->status)
2697                         goto encode_op;
2698
2699                 if (op->opdesc->op_get_currentstateid)
2700                         op->opdesc->op_get_currentstateid(cstate, &op->u);
2701                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
2702
2703                 /* Only from SEQUENCE */
2704                 if (cstate->status == nfserr_replay_cache) {
2705                         dprintk("%s NFS4.1 replay from cache\n", __func__);
2706                         status = op->status;
2707                         goto out;
2708                 }
2709                 if (!op->status) {
2710                         if (op->opdesc->op_set_currentstateid)
2711                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
2712
2713                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
2714                                 clear_current_stateid(cstate);
2715
2716                         if (current_fh->fh_export &&
2717                                         need_wrongsec_check(rqstp))
2718                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
2719                 }
2720 encode_op:
2721                 if (op->status == nfserr_replay_me) {
2722                         op->replay = &cstate->replay_owner->so_replay;
2723                         nfsd4_encode_replay(resp->xdr, op);
2724                         status = op->status = op->replay->rp_status;
2725                 } else {
2726                         nfsd4_encode_operation(resp, op);
2727                         status = op->status;
2728                 }
2729
2730                 trace_nfsd_compound_status(args->opcnt, resp->opcnt, status,
2731                                            nfsd4_op_name(op->opnum));
2732
2733                 nfsd4_cstate_clear_replay(cstate);
2734                 nfsd4_increment_op_stats(op->opnum);
2735         }
2736
2737         fh_put(current_fh);
2738         fh_put(save_fh);
2739         BUG_ON(cstate->replay_owner);
2740 out:
2741         cstate->status = status;
2742         /* Reset deferral mechanism for RPC deferrals */
2743         __set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
2744         return rpc_success;
2745 }
2746
2747 #define op_encode_hdr_size              (2)
2748 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
2749 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
2750 #define op_encode_change_info_maxsz     (5)
2751 #define nfs4_fattr_bitmap_maxsz         (4)
2752
2753 /* We'll fall back on returning no lockowner if run out of space: */
2754 #define op_encode_lockowner_maxsz       (0)
2755 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
2756
2757 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
2758
2759 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
2760 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
2761                                          op_encode_ace_maxsz)
2762
2763 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
2764
2765 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2766 {
2767         return (op_encode_hdr_size) * sizeof(__be32);
2768 }
2769
2770 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2771 {
2772         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
2773 }
2774
2775 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2776 {
2777         /* ac_supported, ac_resp_access */
2778         return (op_encode_hdr_size + 2)* sizeof(__be32);
2779 }
2780
2781 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2782 {
2783         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
2784 }
2785
2786 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2787 {
2788         return (op_encode_hdr_size + op_encode_change_info_maxsz
2789                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2790 }
2791
2792 /*
2793  * Note since this is an idempotent operation we won't insist on failing
2794  * the op prematurely if the estimate is too large.  We may turn off splice
2795  * reads unnecessarily.
2796  */
2797 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
2798                                       struct nfsd4_op *op)
2799 {
2800         u32 *bmap = op->u.getattr.ga_bmval;
2801         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
2802         u32 ret = 0;
2803
2804         if (bmap0 & FATTR4_WORD0_ACL)
2805                 return svc_max_payload(rqstp);
2806         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
2807                 return svc_max_payload(rqstp);
2808
2809         if (bmap1 & FATTR4_WORD1_OWNER) {
2810                 ret += IDMAP_NAMESZ + 4;
2811                 bmap1 &= ~FATTR4_WORD1_OWNER;
2812         }
2813         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
2814                 ret += IDMAP_NAMESZ + 4;
2815                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
2816         }
2817         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
2818                 ret += NFS4_FHSIZE + 4;
2819                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
2820         }
2821         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
2822                 ret += NFS4_MAXLABELLEN + 12;
2823                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2824         }
2825         /*
2826          * Largest of remaining attributes are 16 bytes (e.g.,
2827          * supported_attributes)
2828          */
2829         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
2830         /* bitmask, length */
2831         ret += 20;
2832         return ret;
2833 }
2834
2835 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2836 {
2837         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
2838 }
2839
2840 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2841 {
2842         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2843                 * sizeof(__be32);
2844 }
2845
2846 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2847 {
2848         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
2849                 * sizeof(__be32);
2850 }
2851
2852 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2853 {
2854         return (op_encode_hdr_size + op_encode_stateid_maxsz
2855                 + op_encode_change_info_maxsz + 1
2856                 + nfs4_fattr_bitmap_maxsz
2857                 + op_encode_delegation_maxsz) * sizeof(__be32);
2858 }
2859
2860 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2861 {
2862         u32 maxcount = 0, rlen = 0;
2863
2864         maxcount = svc_max_payload(rqstp);
2865         rlen = min(op->u.read.rd_length, maxcount);
2866
2867         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
2868 }
2869
2870 static inline u32 nfsd4_read_plus_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2871 {
2872         u32 maxcount = svc_max_payload(rqstp);
2873         u32 rlen = min(op->u.read.rd_length, maxcount);
2874         /*
2875          * If we detect that the file changed during hole encoding, then we
2876          * recover by encoding the remaining reply as data. This means we need
2877          * to set aside enough room to encode two data segments.
2878          */
2879         u32 seg_len = 2 * (1 + 2 + 1);
2880
2881         return (op_encode_hdr_size + 2 + seg_len + XDR_QUADLEN(rlen)) * sizeof(__be32);
2882 }
2883
2884 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2885 {
2886         u32 maxcount = 0, rlen = 0;
2887
2888         maxcount = svc_max_payload(rqstp);
2889         rlen = min(op->u.readdir.rd_maxcount, maxcount);
2890
2891         return (op_encode_hdr_size + op_encode_verifier_maxsz +
2892                 XDR_QUADLEN(rlen)) * sizeof(__be32);
2893 }
2894
2895 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2896 {
2897         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
2898 }
2899
2900 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2901 {
2902         return (op_encode_hdr_size + op_encode_change_info_maxsz)
2903                 * sizeof(__be32);
2904 }
2905
2906 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2907 {
2908         return (op_encode_hdr_size + op_encode_change_info_maxsz
2909                 + op_encode_change_info_maxsz) * sizeof(__be32);
2910 }
2911
2912 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
2913                                        struct nfsd4_op *op)
2914 {
2915         return (op_encode_hdr_size
2916                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
2917 }
2918
2919 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2920 {
2921         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
2922                 * sizeof(__be32);
2923 }
2924
2925 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2926 {
2927         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2928 }
2929
2930 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2931 {
2932         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2933                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2934 }
2935
2936 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2937 {
2938         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2939                                                                 sizeof(__be32);
2940 }
2941
2942 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2943 {
2944         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2945 }
2946
2947 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2948 {
2949         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2950                 1 + 1 + /* eir_flags, spr_how */\
2951                 4 + /* spo_must_enforce & _allow with bitmap */\
2952                 2 + /*eir_server_owner.so_minor_id */\
2953                 /* eir_server_owner.so_major_id<> */\
2954                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2955                 /* eir_server_scope<> */\
2956                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2957                 1 + /* eir_server_impl_id array length */\
2958                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2959 }
2960
2961 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2962 {
2963         return (op_encode_hdr_size + \
2964                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2965                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2966 }
2967
2968 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2969 {
2970         return (op_encode_hdr_size + \
2971                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2972                 2 + /* csr_sequence, csr_flags */\
2973                 op_encode_channel_attrs_maxsz + \
2974                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2975 }
2976
2977 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2978 {
2979         return (op_encode_hdr_size +
2980                 1 /* wr_callback */ +
2981                 op_encode_stateid_maxsz /* wr_callback */ +
2982                 2 /* wr_count */ +
2983                 1 /* wr_committed */ +
2984                 op_encode_verifier_maxsz +
2985                 1 /* cr_consecutive */ +
2986                 1 /* cr_synchronous */) * sizeof(__be32);
2987 }
2988
2989 static inline u32 nfsd4_offload_status_rsize(struct svc_rqst *rqstp,
2990                                              struct nfsd4_op *op)
2991 {
2992         return (op_encode_hdr_size +
2993                 2 /* osr_count */ +
2994                 1 /* osr_complete<1> optional 0 for now */) * sizeof(__be32);
2995 }
2996
2997 static inline u32 nfsd4_copy_notify_rsize(struct svc_rqst *rqstp,
2998                                         struct nfsd4_op *op)
2999 {
3000         return (op_encode_hdr_size +
3001                 3 /* cnr_lease_time */ +
3002                 1 /* We support one cnr_source_server */ +
3003                 1 /* cnr_stateid seq */ +
3004                 op_encode_stateid_maxsz /* cnr_stateid */ +
3005                 1 /* num cnr_source_server*/ +
3006                 1 /* nl4_type */ +
3007                 1 /* nl4 size */ +
3008                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) /*nl4_loc + nl4_loc_sz */)
3009                 * sizeof(__be32);
3010 }
3011
3012 #ifdef CONFIG_NFSD_PNFS
3013 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3014 {
3015         u32 maxcount = 0, rlen = 0;
3016
3017         maxcount = svc_max_payload(rqstp);
3018         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
3019
3020         return (op_encode_hdr_size +
3021                 1 /* gd_layout_type*/ +
3022                 XDR_QUADLEN(rlen) +
3023                 2 /* gd_notify_types */) * sizeof(__be32);
3024 }
3025
3026 /*
3027  * At this stage we don't really know what layout driver will handle the request,
3028  * so we need to define an arbitrary upper bound here.
3029  */
3030 #define MAX_LAYOUT_SIZE         128
3031 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3032 {
3033         return (op_encode_hdr_size +
3034                 1 /* logr_return_on_close */ +
3035                 op_encode_stateid_maxsz +
3036                 1 /* nr of layouts */ +
3037                 MAX_LAYOUT_SIZE) * sizeof(__be32);
3038 }
3039
3040 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3041 {
3042         return (op_encode_hdr_size +
3043                 1 /* locr_newsize */ +
3044                 2 /* ns_size */) * sizeof(__be32);
3045 }
3046
3047 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3048 {
3049         return (op_encode_hdr_size +
3050                 1 /* lrs_stateid */ +
3051                 op_encode_stateid_maxsz) * sizeof(__be32);
3052 }
3053 #endif /* CONFIG_NFSD_PNFS */
3054
3055
3056 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
3057 {
3058         return (op_encode_hdr_size + 3) * sizeof(__be32);
3059 }
3060
3061 static inline u32 nfsd4_getxattr_rsize(struct svc_rqst *rqstp,
3062                                        struct nfsd4_op *op)
3063 {
3064         u32 maxcount, rlen;
3065
3066         maxcount = svc_max_payload(rqstp);
3067         rlen = min_t(u32, XATTR_SIZE_MAX, maxcount);
3068
3069         return (op_encode_hdr_size + 1 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3070 }
3071
3072 static inline u32 nfsd4_setxattr_rsize(struct svc_rqst *rqstp,
3073                                        struct nfsd4_op *op)
3074 {
3075         return (op_encode_hdr_size + op_encode_change_info_maxsz)
3076                 * sizeof(__be32);
3077 }
3078 static inline u32 nfsd4_listxattrs_rsize(struct svc_rqst *rqstp,
3079                                          struct nfsd4_op *op)
3080 {
3081         u32 maxcount, rlen;
3082
3083         maxcount = svc_max_payload(rqstp);
3084         rlen = min(op->u.listxattrs.lsxa_maxcount, maxcount);
3085
3086         return (op_encode_hdr_size + 4 + XDR_QUADLEN(rlen)) * sizeof(__be32);
3087 }
3088
3089 static inline u32 nfsd4_removexattr_rsize(struct svc_rqst *rqstp,
3090                                           struct nfsd4_op *op)
3091 {
3092         return (op_encode_hdr_size + op_encode_change_info_maxsz)
3093                 * sizeof(__be32);
3094 }
3095
3096
3097 static const struct nfsd4_operation nfsd4_ops[] = {
3098         [OP_ACCESS] = {
3099                 .op_func = nfsd4_access,
3100                 .op_name = "OP_ACCESS",
3101                 .op_rsize_bop = nfsd4_access_rsize,
3102         },
3103         [OP_CLOSE] = {
3104                 .op_func = nfsd4_close,
3105                 .op_flags = OP_MODIFIES_SOMETHING,
3106                 .op_name = "OP_CLOSE",
3107                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3108                 .op_get_currentstateid = nfsd4_get_closestateid,
3109                 .op_set_currentstateid = nfsd4_set_closestateid,
3110         },
3111         [OP_COMMIT] = {
3112                 .op_func = nfsd4_commit,
3113                 .op_flags = OP_MODIFIES_SOMETHING,
3114                 .op_name = "OP_COMMIT",
3115                 .op_rsize_bop = nfsd4_commit_rsize,
3116         },
3117         [OP_CREATE] = {
3118                 .op_func = nfsd4_create,
3119                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
3120                 .op_name = "OP_CREATE",
3121                 .op_rsize_bop = nfsd4_create_rsize,
3122         },
3123         [OP_DELEGRETURN] = {
3124                 .op_func = nfsd4_delegreturn,
3125                 .op_flags = OP_MODIFIES_SOMETHING,
3126                 .op_name = "OP_DELEGRETURN",
3127                 .op_rsize_bop = nfsd4_only_status_rsize,
3128                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
3129         },
3130         [OP_GETATTR] = {
3131                 .op_func = nfsd4_getattr,
3132                 .op_flags = ALLOWED_ON_ABSENT_FS,
3133                 .op_rsize_bop = nfsd4_getattr_rsize,
3134                 .op_name = "OP_GETATTR",
3135         },
3136         [OP_GETFH] = {
3137                 .op_func = nfsd4_getfh,
3138                 .op_name = "OP_GETFH",
3139                 .op_rsize_bop = nfsd4_getfh_rsize,
3140         },
3141         [OP_LINK] = {
3142                 .op_func = nfsd4_link,
3143                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
3144                                 | OP_CACHEME,
3145                 .op_name = "OP_LINK",
3146                 .op_rsize_bop = nfsd4_link_rsize,
3147         },
3148         [OP_LOCK] = {
3149                 .op_func = nfsd4_lock,
3150                 .op_flags = OP_MODIFIES_SOMETHING |
3151                                 OP_NONTRIVIAL_ERROR_ENCODE,
3152                 .op_name = "OP_LOCK",
3153                 .op_rsize_bop = nfsd4_lock_rsize,
3154                 .op_set_currentstateid = nfsd4_set_lockstateid,
3155         },
3156         [OP_LOCKT] = {
3157                 .op_func = nfsd4_lockt,
3158                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
3159                 .op_name = "OP_LOCKT",
3160                 .op_rsize_bop = nfsd4_lock_rsize,
3161         },
3162         [OP_LOCKU] = {
3163                 .op_func = nfsd4_locku,
3164                 .op_flags = OP_MODIFIES_SOMETHING,
3165                 .op_name = "OP_LOCKU",
3166                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3167                 .op_get_currentstateid = nfsd4_get_lockustateid,
3168         },
3169         [OP_LOOKUP] = {
3170                 .op_func = nfsd4_lookup,
3171                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3172                 .op_name = "OP_LOOKUP",
3173                 .op_rsize_bop = nfsd4_only_status_rsize,
3174         },
3175         [OP_LOOKUPP] = {
3176                 .op_func = nfsd4_lookupp,
3177                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
3178                 .op_name = "OP_LOOKUPP",
3179                 .op_rsize_bop = nfsd4_only_status_rsize,
3180         },
3181         [OP_NVERIFY] = {
3182                 .op_func = nfsd4_nverify,
3183                 .op_name = "OP_NVERIFY",
3184                 .op_rsize_bop = nfsd4_only_status_rsize,
3185         },
3186         [OP_OPEN] = {
3187                 .op_func = nfsd4_open,
3188                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3189                 .op_name = "OP_OPEN",
3190                 .op_rsize_bop = nfsd4_open_rsize,
3191                 .op_set_currentstateid = nfsd4_set_openstateid,
3192         },
3193         [OP_OPEN_CONFIRM] = {
3194                 .op_func = nfsd4_open_confirm,
3195                 .op_flags = OP_MODIFIES_SOMETHING,
3196                 .op_name = "OP_OPEN_CONFIRM",
3197                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3198         },
3199         [OP_OPEN_DOWNGRADE] = {
3200                 .op_func = nfsd4_open_downgrade,
3201                 .op_flags = OP_MODIFIES_SOMETHING,
3202                 .op_name = "OP_OPEN_DOWNGRADE",
3203                 .op_rsize_bop = nfsd4_status_stateid_rsize,
3204                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
3205                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
3206         },
3207         [OP_PUTFH] = {
3208                 .op_func = nfsd4_putfh,
3209                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3210                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3211                 .op_name = "OP_PUTFH",
3212                 .op_rsize_bop = nfsd4_only_status_rsize,
3213         },
3214         [OP_PUTPUBFH] = {
3215                 .op_func = nfsd4_putrootfh,
3216                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3217                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3218                 .op_name = "OP_PUTPUBFH",
3219                 .op_rsize_bop = nfsd4_only_status_rsize,
3220         },
3221         [OP_PUTROOTFH] = {
3222                 .op_func = nfsd4_putrootfh,
3223                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3224                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
3225                 .op_name = "OP_PUTROOTFH",
3226                 .op_rsize_bop = nfsd4_only_status_rsize,
3227         },
3228         [OP_READ] = {
3229                 .op_func = nfsd4_read,
3230                 .op_release = nfsd4_read_release,
3231                 .op_name = "OP_READ",
3232                 .op_rsize_bop = nfsd4_read_rsize,
3233                 .op_get_currentstateid = nfsd4_get_readstateid,
3234         },
3235         [OP_READDIR] = {
3236                 .op_func = nfsd4_readdir,
3237                 .op_name = "OP_READDIR",
3238                 .op_rsize_bop = nfsd4_readdir_rsize,
3239         },
3240         [OP_READLINK] = {
3241                 .op_func = nfsd4_readlink,
3242                 .op_name = "OP_READLINK",
3243                 .op_rsize_bop = nfsd4_readlink_rsize,
3244         },
3245         [OP_REMOVE] = {
3246                 .op_func = nfsd4_remove,
3247                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3248                 .op_name = "OP_REMOVE",
3249                 .op_rsize_bop = nfsd4_remove_rsize,
3250         },
3251         [OP_RENAME] = {
3252                 .op_func = nfsd4_rename,
3253                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3254                 .op_name = "OP_RENAME",
3255                 .op_rsize_bop = nfsd4_rename_rsize,
3256         },
3257         [OP_RENEW] = {
3258                 .op_func = nfsd4_renew,
3259                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3260                                 | OP_MODIFIES_SOMETHING,
3261                 .op_name = "OP_RENEW",
3262                 .op_rsize_bop = nfsd4_only_status_rsize,
3263
3264         },
3265         [OP_RESTOREFH] = {
3266                 .op_func = nfsd4_restorefh,
3267                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3268                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
3269                 .op_name = "OP_RESTOREFH",
3270                 .op_rsize_bop = nfsd4_only_status_rsize,
3271         },
3272         [OP_SAVEFH] = {
3273                 .op_func = nfsd4_savefh,
3274                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
3275                 .op_name = "OP_SAVEFH",
3276                 .op_rsize_bop = nfsd4_only_status_rsize,
3277         },
3278         [OP_SECINFO] = {
3279                 .op_func = nfsd4_secinfo,
3280                 .op_release = nfsd4_secinfo_release,
3281                 .op_flags = OP_HANDLES_WRONGSEC,
3282                 .op_name = "OP_SECINFO",
3283                 .op_rsize_bop = nfsd4_secinfo_rsize,
3284         },
3285         [OP_SETATTR] = {
3286                 .op_func = nfsd4_setattr,
3287                 .op_name = "OP_SETATTR",
3288                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
3289                                 | OP_NONTRIVIAL_ERROR_ENCODE,
3290                 .op_rsize_bop = nfsd4_setattr_rsize,
3291                 .op_get_currentstateid = nfsd4_get_setattrstateid,
3292         },
3293         [OP_SETCLIENTID] = {
3294                 .op_func = nfsd4_setclientid,
3295                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3296                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
3297                                 | OP_NONTRIVIAL_ERROR_ENCODE,
3298                 .op_name = "OP_SETCLIENTID",
3299                 .op_rsize_bop = nfsd4_setclientid_rsize,
3300         },
3301         [OP_SETCLIENTID_CONFIRM] = {
3302                 .op_func = nfsd4_setclientid_confirm,
3303                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3304                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
3305                 .op_name = "OP_SETCLIENTID_CONFIRM",
3306                 .op_rsize_bop = nfsd4_only_status_rsize,
3307         },
3308         [OP_VERIFY] = {
3309                 .op_func = nfsd4_verify,
3310                 .op_name = "OP_VERIFY",
3311                 .op_rsize_bop = nfsd4_only_status_rsize,
3312         },
3313         [OP_WRITE] = {
3314                 .op_func = nfsd4_write,
3315                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3316                 .op_name = "OP_WRITE",
3317                 .op_rsize_bop = nfsd4_write_rsize,
3318                 .op_get_currentstateid = nfsd4_get_writestateid,
3319         },
3320         [OP_RELEASE_LOCKOWNER] = {
3321                 .op_func = nfsd4_release_lockowner,
3322                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
3323                                 | OP_MODIFIES_SOMETHING,
3324                 .op_name = "OP_RELEASE_LOCKOWNER",
3325                 .op_rsize_bop = nfsd4_only_status_rsize,
3326         },
3327
3328         /* NFSv4.1 operations */
3329         [OP_EXCHANGE_ID] = {
3330                 .op_func = nfsd4_exchange_id,
3331                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3332                                 | OP_MODIFIES_SOMETHING,
3333                 .op_name = "OP_EXCHANGE_ID",
3334                 .op_rsize_bop = nfsd4_exchange_id_rsize,
3335         },
3336         [OP_BACKCHANNEL_CTL] = {
3337                 .op_func = nfsd4_backchannel_ctl,
3338                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3339                 .op_name = "OP_BACKCHANNEL_CTL",
3340                 .op_rsize_bop = nfsd4_only_status_rsize,
3341         },
3342         [OP_BIND_CONN_TO_SESSION] = {
3343                 .op_func = nfsd4_bind_conn_to_session,
3344                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3345                                 | OP_MODIFIES_SOMETHING,
3346                 .op_name = "OP_BIND_CONN_TO_SESSION",
3347                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
3348         },
3349         [OP_CREATE_SESSION] = {
3350                 .op_func = nfsd4_create_session,
3351                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3352                                 | OP_MODIFIES_SOMETHING,
3353                 .op_name = "OP_CREATE_SESSION",
3354                 .op_rsize_bop = nfsd4_create_session_rsize,
3355         },
3356         [OP_DESTROY_SESSION] = {
3357                 .op_func = nfsd4_destroy_session,
3358                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3359                                 | OP_MODIFIES_SOMETHING,
3360                 .op_name = "OP_DESTROY_SESSION",
3361                 .op_rsize_bop = nfsd4_only_status_rsize,
3362         },
3363         [OP_SEQUENCE] = {
3364                 .op_func = nfsd4_sequence,
3365                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
3366                 .op_name = "OP_SEQUENCE",
3367                 .op_rsize_bop = nfsd4_sequence_rsize,
3368         },
3369         [OP_DESTROY_CLIENTID] = {
3370                 .op_func = nfsd4_destroy_clientid,
3371                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
3372                                 | OP_MODIFIES_SOMETHING,
3373                 .op_name = "OP_DESTROY_CLIENTID",
3374                 .op_rsize_bop = nfsd4_only_status_rsize,
3375         },
3376         [OP_RECLAIM_COMPLETE] = {
3377                 .op_func = nfsd4_reclaim_complete,
3378                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3379                 .op_name = "OP_RECLAIM_COMPLETE",
3380                 .op_rsize_bop = nfsd4_only_status_rsize,
3381         },
3382         [OP_SECINFO_NO_NAME] = {
3383                 .op_func = nfsd4_secinfo_no_name,
3384                 .op_release = nfsd4_secinfo_no_name_release,
3385                 .op_flags = OP_HANDLES_WRONGSEC,
3386                 .op_name = "OP_SECINFO_NO_NAME",
3387                 .op_rsize_bop = nfsd4_secinfo_rsize,
3388         },
3389         [OP_TEST_STATEID] = {
3390                 .op_func = nfsd4_test_stateid,
3391                 .op_flags = ALLOWED_WITHOUT_FH,
3392                 .op_name = "OP_TEST_STATEID",
3393                 .op_rsize_bop = nfsd4_test_stateid_rsize,
3394         },
3395         [OP_FREE_STATEID] = {
3396                 .op_func = nfsd4_free_stateid,
3397                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
3398                 .op_name = "OP_FREE_STATEID",
3399                 .op_get_currentstateid = nfsd4_get_freestateid,
3400                 .op_rsize_bop = nfsd4_only_status_rsize,
3401         },
3402 #ifdef CONFIG_NFSD_PNFS
3403         [OP_GETDEVICEINFO] = {
3404                 .op_func = nfsd4_getdeviceinfo,
3405                 .op_release = nfsd4_getdeviceinfo_release,
3406                 .op_flags = ALLOWED_WITHOUT_FH,
3407                 .op_name = "OP_GETDEVICEINFO",
3408                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
3409         },
3410         [OP_LAYOUTGET] = {
3411                 .op_func = nfsd4_layoutget,
3412                 .op_release = nfsd4_layoutget_release,
3413                 .op_flags = OP_MODIFIES_SOMETHING,
3414                 .op_name = "OP_LAYOUTGET",
3415                 .op_rsize_bop = nfsd4_layoutget_rsize,
3416         },
3417         [OP_LAYOUTCOMMIT] = {
3418                 .op_func = nfsd4_layoutcommit,
3419                 .op_flags = OP_MODIFIES_SOMETHING,
3420                 .op_name = "OP_LAYOUTCOMMIT",
3421                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
3422         },
3423         [OP_LAYOUTRETURN] = {
3424                 .op_func = nfsd4_layoutreturn,
3425                 .op_flags = OP_MODIFIES_SOMETHING,
3426                 .op_name = "OP_LAYOUTRETURN",
3427                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
3428         },
3429 #endif /* CONFIG_NFSD_PNFS */
3430
3431         /* NFSv4.2 operations */
3432         [OP_ALLOCATE] = {
3433                 .op_func = nfsd4_allocate,
3434                 .op_flags = OP_MODIFIES_SOMETHING,
3435                 .op_name = "OP_ALLOCATE",
3436                 .op_rsize_bop = nfsd4_only_status_rsize,
3437         },
3438         [OP_DEALLOCATE] = {
3439                 .op_func = nfsd4_deallocate,
3440                 .op_flags = OP_MODIFIES_SOMETHING,
3441                 .op_name = "OP_DEALLOCATE",
3442                 .op_rsize_bop = nfsd4_only_status_rsize,
3443         },
3444         [OP_CLONE] = {
3445                 .op_func = nfsd4_clone,
3446                 .op_flags = OP_MODIFIES_SOMETHING,
3447                 .op_name = "OP_CLONE",
3448                 .op_rsize_bop = nfsd4_only_status_rsize,
3449         },
3450         [OP_COPY] = {
3451                 .op_func = nfsd4_copy,
3452                 .op_flags = OP_MODIFIES_SOMETHING,
3453                 .op_name = "OP_COPY",
3454                 .op_rsize_bop = nfsd4_copy_rsize,
3455         },
3456         [OP_READ_PLUS] = {
3457                 .op_func = nfsd4_read,
3458                 .op_release = nfsd4_read_release,
3459                 .op_name = "OP_READ_PLUS",
3460                 .op_rsize_bop = nfsd4_read_plus_rsize,
3461                 .op_get_currentstateid = nfsd4_get_readstateid,
3462         },
3463         [OP_SEEK] = {
3464                 .op_func = nfsd4_seek,
3465                 .op_name = "OP_SEEK",
3466                 .op_rsize_bop = nfsd4_seek_rsize,
3467         },
3468         [OP_OFFLOAD_STATUS] = {
3469                 .op_func = nfsd4_offload_status,
3470                 .op_name = "OP_OFFLOAD_STATUS",
3471                 .op_rsize_bop = nfsd4_offload_status_rsize,
3472         },
3473         [OP_OFFLOAD_CANCEL] = {
3474                 .op_func = nfsd4_offload_cancel,
3475                 .op_flags = OP_MODIFIES_SOMETHING,
3476                 .op_name = "OP_OFFLOAD_CANCEL",
3477                 .op_rsize_bop = nfsd4_only_status_rsize,
3478         },
3479         [OP_COPY_NOTIFY] = {
3480                 .op_func = nfsd4_copy_notify,
3481                 .op_flags = OP_MODIFIES_SOMETHING,
3482                 .op_name = "OP_COPY_NOTIFY",
3483                 .op_rsize_bop = nfsd4_copy_notify_rsize,
3484         },
3485         [OP_GETXATTR] = {
3486                 .op_func = nfsd4_getxattr,
3487                 .op_name = "OP_GETXATTR",
3488                 .op_rsize_bop = nfsd4_getxattr_rsize,
3489         },
3490         [OP_SETXATTR] = {
3491                 .op_func = nfsd4_setxattr,
3492                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3493                 .op_name = "OP_SETXATTR",
3494                 .op_rsize_bop = nfsd4_setxattr_rsize,
3495         },
3496         [OP_LISTXATTRS] = {
3497                 .op_func = nfsd4_listxattrs,
3498                 .op_name = "OP_LISTXATTRS",
3499                 .op_rsize_bop = nfsd4_listxattrs_rsize,
3500         },
3501         [OP_REMOVEXATTR] = {
3502                 .op_func = nfsd4_removexattr,
3503                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
3504                 .op_name = "OP_REMOVEXATTR",
3505                 .op_rsize_bop = nfsd4_removexattr_rsize,
3506         },
3507 };
3508
3509 /**
3510  * nfsd4_spo_must_allow - Determine if the compound op contains an
3511  * operation that is allowed to be sent with machine credentials
3512  *
3513  * @rqstp: a pointer to the struct svc_rqst
3514  *
3515  * Checks to see if the compound contains a spo_must_allow op
3516  * and confirms that it was sent with the proper machine creds.
3517  */
3518
3519 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
3520 {
3521         struct nfsd4_compoundres *resp = rqstp->rq_resp;
3522         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3523         struct nfsd4_op *this;
3524         struct nfsd4_compound_state *cstate = &resp->cstate;
3525         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
3526         u32 opiter;
3527
3528         if (!cstate->minorversion)
3529                 return false;
3530
3531         if (cstate->spo_must_allowed)
3532                 return true;
3533
3534         opiter = resp->opcnt;
3535         while (opiter < argp->opcnt) {
3536                 this = &argp->ops[opiter++];
3537                 if (test_bit(this->opnum, allow->u.longs) &&
3538                         cstate->clp->cl_mach_cred &&
3539                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
3540                         cstate->spo_must_allowed = true;
3541                         return true;
3542                 }
3543         }
3544         cstate->spo_must_allowed = false;
3545         return false;
3546 }
3547
3548 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
3549 {
3550         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
3551                 return op_encode_hdr_size * sizeof(__be32);
3552
3553         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
3554         return OPDESC(op)->op_rsize_bop(rqstp, op);
3555 }
3556
3557 void warn_on_nonidempotent_op(struct nfsd4_op *op)
3558 {
3559         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
3560                 pr_err("unable to encode reply to nonidempotent op %u (%s)\n",
3561                         op->opnum, nfsd4_op_name(op->opnum));
3562                 WARN_ON_ONCE(1);
3563         }
3564 }
3565
3566 static const char *nfsd4_op_name(unsigned opnum)
3567 {
3568         if (opnum < ARRAY_SIZE(nfsd4_ops))
3569                 return nfsd4_ops[opnum].op_name;
3570         return "unknown_operation";
3571 }
3572
3573 static const struct svc_procedure nfsd_procedures4[2] = {
3574         [NFSPROC4_NULL] = {
3575                 .pc_func = nfsd4_proc_null,
3576                 .pc_decode = nfssvc_decode_voidarg,
3577                 .pc_encode = nfssvc_encode_voidres,
3578                 .pc_argsize = sizeof(struct nfsd_voidargs),
3579                 .pc_ressize = sizeof(struct nfsd_voidres),
3580                 .pc_cachetype = RC_NOCACHE,
3581                 .pc_xdrressize = 1,
3582                 .pc_name = "NULL",
3583         },
3584         [NFSPROC4_COMPOUND] = {
3585                 .pc_func = nfsd4_proc_compound,
3586                 .pc_decode = nfs4svc_decode_compoundargs,
3587                 .pc_encode = nfs4svc_encode_compoundres,
3588                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
3589                 .pc_ressize = sizeof(struct nfsd4_compoundres),
3590                 .pc_release = nfsd4_release_compoundargs,
3591                 .pc_cachetype = RC_NOCACHE,
3592                 .pc_xdrressize = NFSD_BUFSIZE/4,
3593                 .pc_name = "COMPOUND",
3594         },
3595 };
3596
3597 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
3598 const struct svc_version nfsd_version4 = {
3599         .vs_vers                = 4,
3600         .vs_nproc               = 2,
3601         .vs_proc                = nfsd_procedures4,
3602         .vs_count               = nfsd_count3,
3603         .vs_dispatch            = nfsd_dispatch,
3604         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
3605         .vs_rpcb_optnl          = true,
3606         .vs_need_cong_ctrl      = true,
3607 };