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
  40 #include "idmap.h"
  41 #include "cache.h"
  42 #include "xdr4.h"
  43 #include "vfs.h"
  44 #include "current_stateid.h"
  45 #include "netns.h"
  46 #include "acl.h"
  47 #include "pnfs.h"
  48 #include "trace.h"
  49
  50 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  51 #include <linux/security.h>
  52
  53 static inline void
  54 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  55 {
  56         struct inode *inode = d_inode(resfh->fh_dentry);
  57         int status;
  58
  59         inode_lock(inode);
  60         status = security_inode_setsecctx(resfh->fh_dentry,
  61                 label->data, label->len);
  62         inode_unlock(inode);
  63
  64         if (status)
  65                 /*
  66                  * XXX: We should really fail the whole open, but we may
  67                  * already have created a new file, so it may be too
  68                  * late.  For now this seems the least of evils:
  69                  */
  70                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  71
  72         return;
  73 }
  74 #else
  75 static inline void
  76 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  77 { }
  78 #endif
  79
  80 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  81
  82 static u32 nfsd_attrmask[] = {
  83         NFSD_WRITEABLE_ATTRS_WORD0,
  84         NFSD_WRITEABLE_ATTRS_WORD1,
  85         NFSD_WRITEABLE_ATTRS_WORD2
  86 };
  87
  88 static u32 nfsd41_ex_attrmask[] = {
  89         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  91         NFSD_SUPPATTR_EXCLCREAT_WORD2
  92 };
  93
  94 static __be32
  95 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  96                    u32 *bmval, u32 *writable)
  97 {
  98         struct dentry *dentry = cstate->current_fh.fh_dentry;
  99         struct svc_export *exp = cstate->current_fh.fh_export;
 100
 101         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 102                 return nfserr_attrnotsupp;
 103         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 104                 return nfserr_attrnotsupp;
 105         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 106                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 107                 return nfserr_attrnotsupp;
 108         if (writable && !bmval_is_subset(bmval, writable))
 109                 return nfserr_inval;
 110         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 111                         (bmval[1] & FATTR4_WORD1_MODE))
 112                 return nfserr_inval;
 113         return nfs_ok;
 114 }
 115
 116 static __be32
 117 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 118         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 119 {
 120         __be32 status = nfs_ok;
 121
 122         if (open->op_create == NFS4_OPEN_CREATE) {
 123                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 124                     || open->op_createmode == NFS4_CREATE_GUARDED)
 125                         status = check_attr_support(rqstp, cstate,
 126                                         open->op_bmval, nfsd_attrmask);
 127                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 128                         status = check_attr_support(rqstp, cstate,
 129                                         open->op_bmval, nfsd41_ex_attrmask);
 130         }
 131
 132         return status;
 133 }
 134
 135 static int
 136 is_create_with_attrs(struct nfsd4_open *open)
 137 {
 138         return open->op_create == NFS4_OPEN_CREATE
 139                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 140                     || open->op_createmode == NFS4_CREATE_GUARDED
 141                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 142 }
 143
 144 /*
 145  * if error occurs when setting the acl, just clear the acl bit
 146  * in the returned attr bitmap.
 147  */
 148 static void
 149 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 150                 struct nfs4_acl *acl, u32 *bmval)
 151 {
 152         __be32 status;
 153
 154         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 155         if (status)
 156                 /*
 157                  * We should probably fail the whole open at this point,
 158                  * but we've already created the file, so it's too late;
 159                  * So this seems the least of evils:
 160                  */
 161                 bmval[0] &= ~FATTR4_WORD0_ACL;
 162 }
 163
 164 static inline void
 165 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 166 {
 167         fh_put(dst);
 168         dget(src->fh_dentry);
 169         if (src->fh_export)
 170                 exp_get(src->fh_export);
 171         *dst = *src;
 172 }
 173
 174 static __be32
 175 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 176 {
 177         __be32 status;
 178
 179         if (open->op_truncate &&
 180                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 181                 return nfserr_inval;
 182
 183         accmode |= NFSD_MAY_READ_IF_EXEC;
 184
 185         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 186                 accmode |= NFSD_MAY_READ;
 187         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 188                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 189         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 190                 accmode |= NFSD_MAY_WRITE;
 191
 192         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 193
 194         return status;
 195 }
 196
 197 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 198 {
 199         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 200
 201         if (S_ISREG(mode))
 202                 return nfs_ok;
 203         if (S_ISDIR(mode))
 204                 return nfserr_isdir;
 205         /*
 206          * Using err_symlink as our catch-all case may look odd; but
 207          * there's no other obvious error for this case in 4.0, and we
 208          * happen to know that it will cause the linux v4 client to do
 209          * the right thing on attempts to open something other than a
 210          * regular file.
 211          */
 212         return nfserr_symlink;
 213 }
 214
 215 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 216 {
 217         if (nfsd4_has_session(cstate))
 218                 return;
 219         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 220                         &resfh->fh_handle);
 221 }
 222
 223 static __be32
 224 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 225 {
 226         struct svc_fh *current_fh = &cstate->current_fh;
 227         int accmode;
 228         __be32 status;
 229
 230         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 231         if (!*resfh)
 232                 return nfserr_jukebox;
 233         fh_init(*resfh, NFS4_FHSIZE);
 234         open->op_truncate = 0;
 235
 236         if (open->op_create) {
 237                 /* FIXME: check session persistence and pnfs flags.
 238                  * The nfsv4.1 spec requires the following semantics:
 239                  *
 240                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 241                  * Reply Cache  | server |                 |
 242                  * -------------+--------+-----------------+--------------------
 243                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 244                  *              |        |                 | (SHOULD)
 245                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 246                  *              |        |                 | (SHOULD NOT)
 247                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 248                  * yes          | no     | GUARDED4        | GUARDED4
 249                  * yes          | yes    | GUARDED4        | GUARDED4
 250                  */
 251
 252                 /*
 253                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 254                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 255                  */
 256                 current->fs->umask = open->op_umask;
 257                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 258                                         open->op_fname.len, &open->op_iattr,
 259                                         *resfh, open->op_createmode,
 260                                         (u32 *)open->op_verf.data,
 261                                         &open->op_truncate, &open->op_created);
 262                 current->fs->umask = 0;
 263
 264                 if (!status && open->op_label.len)
 265                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 266
 267                 /*
 268                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 269                  * use the returned bitmask to indicate which attributes
 270                  * we used to store the verifier:
 271                  */
 272                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 273                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 274                                                 FATTR4_WORD1_TIME_MODIFY);
 275         } else
 276                 /*
 277                  * Note this may exit with the parent still locked.
 278                  * We will hold the lock until nfsd4_open's final
 279                  * lookup, to prevent renames or unlinks until we've had
 280                  * a chance to an acquire a delegation if appropriate.
 281                  */
 282                 status = nfsd_lookup(rqstp, current_fh,
 283                                      open->op_fname.data, open->op_fname.len, *resfh);
 284         if (status)
 285                 goto out;
 286         status = nfsd_check_obj_isreg(*resfh);
 287         if (status)
 288                 goto out;
 289
 290         if (is_create_with_attrs(open) && open->op_acl != NULL)
 291                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 292
 293         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 294         accmode = NFSD_MAY_NOP;
 295         if (open->op_created ||
 296                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 297                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 298         status = do_open_permission(rqstp, *resfh, open, accmode);
 299         set_change_info(&open->op_cinfo, current_fh);
 300 out:
 301         return status;
 302 }
 303
 304 static __be32
 305 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 306 {
 307         struct svc_fh *current_fh = &cstate->current_fh;
 308         __be32 status;
 309         int accmode = 0;
 310
 311         /* We don't know the target directory, and therefore can not
 312         * set the change info
 313         */
 314
 315         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 316
 317         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 318
 319         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 320                 (open->op_iattr.ia_size == 0);
 321         /*
 322          * In the delegation case, the client is telling us about an
 323          * open that it *already* performed locally, some time ago.  We
 324          * should let it succeed now if possible.
 325          *
 326          * In the case of a CLAIM_FH open, on the other hand, the client
 327          * may be counting on us to enforce permissions (the Linux 4.1
 328          * client uses this for normal opens, for example).
 329          */
 330         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 331                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 332
 333         status = do_open_permission(rqstp, current_fh, open, accmode);
 334
 335         return status;
 336 }
 337
 338 static void
 339 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 340 {
 341         struct nfsd4_sessionid *sid =
 342                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 343
 344         clid->cl_boot = sid->clientid.cl_boot;
 345         clid->cl_id = sid->clientid.cl_id;
 346 }
 347
 348 static __be32
 349 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 350            union nfsd4_op_u *u)
 351 {
 352         struct nfsd4_open *open = &u->open;
 353         __be32 status;
 354         struct svc_fh *resfh = NULL;
 355         struct net *net = SVC_NET(rqstp);
 356         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 357
 358         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 359                 (int)open->op_fname.len, open->op_fname.data,
 360                 open->op_openowner);
 361
 362         /* This check required by spec. */
 363         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 364                 return nfserr_inval;
 365
 366         open->op_created = 0;
 367         /*
 368          * RFC5661 18.51.3
 369          * Before RECLAIM_COMPLETE done, server should deny new lock
 370          */
 371         if (nfsd4_has_session(cstate) &&
 372             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 373                       &cstate->session->se_client->cl_flags) &&
 374             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 375                 return nfserr_grace;
 376
 377         if (nfsd4_has_session(cstate))
 378                 copy_clientid(&open->op_clientid, cstate->session);
 379
 380         /* check seqid for replay. set nfs4_owner */
 381         status = nfsd4_process_open1(cstate, open, nn);
 382         if (status == nfserr_replay_me) {
 383                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 384                 fh_put(&cstate->current_fh);
 385                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 386                                 &rp->rp_openfh);
 387                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 388                 if (status)
 389                         dprintk("nfsd4_open: replay failed"
 390                                 " restoring previous filehandle\n");
 391                 else
 392                         status = nfserr_replay_me;
 393         }
 394         if (status)
 395                 goto out;
 396         if (open->op_xdr_error) {
 397                 status = open->op_xdr_error;
 398                 goto out;
 399         }
 400
 401         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 402         if (status)
 403                 goto out;
 404
 405         /* Openowner is now set, so sequence id will get bumped.  Now we need
 406          * these checks before we do any creates: */
 407         status = nfserr_grace;
 408         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 409                 goto out;
 410         status = nfserr_no_grace;
 411         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 412                 goto out;
 413
 414         switch (open->op_claim_type) {
 415                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 416                 case NFS4_OPEN_CLAIM_NULL:
 417                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 418                         if (status)
 419                                 goto out;
 420                         break;
 421                 case NFS4_OPEN_CLAIM_PREVIOUS:
 422                         status = nfs4_check_open_reclaim(&open->op_clientid,
 423                                                          cstate, nn);
 424                         if (status)
 425                                 goto out;
 426                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 427                 case NFS4_OPEN_CLAIM_FH:
 428                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 429                         status = do_open_fhandle(rqstp, cstate, open);
 430                         if (status)
 431                                 goto out;
 432                         resfh = &cstate->current_fh;
 433                         break;
 434                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 435                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 436                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 437                                 open->op_claim_type);
 438                         status = nfserr_notsupp;
 439                         goto out;
 440                 default:
 441                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 442                                 open->op_claim_type);
 443                         status = nfserr_inval;
 444                         goto out;
 445         }
 446         /*
 447          * nfsd4_process_open2() does the actual opening of the file.  If
 448          * successful, it (1) truncates the file if open->op_truncate was
 449          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 450          */
 451         status = nfsd4_process_open2(rqstp, resfh, open);
 452         WARN(status && open->op_created,
 453              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 454              be32_to_cpu(status));
 455 out:
 456         if (resfh && resfh != &cstate->current_fh) {
 457                 fh_dup2(&cstate->current_fh, resfh);
 458                 fh_put(resfh);
 459                 kfree(resfh);
 460         }
 461         nfsd4_cleanup_open_state(cstate, open);
 462         nfsd4_bump_seqid(cstate, status);
 463         return status;
 464 }
 465
 466 /*
 467  * OPEN is the only seqid-mutating operation whose decoding can fail
 468  * with a seqid-mutating error (specifically, decoding of user names in
 469  * the attributes).  Therefore we have to do some processing to look up
 470  * the stateowner so that we can bump the seqid.
 471  */
 472 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 473 {
 474         struct nfsd4_open *open = &op->u.open;
 475
 476         if (!seqid_mutating_err(ntohl(op->status)))
 477                 return op->status;
 478         if (nfsd4_has_session(cstate))
 479                 return op->status;
 480         open->op_xdr_error = op->status;
 481         return nfsd4_open(rqstp, cstate, &op->u);
 482 }
 483
 484 /*
 485  * filehandle-manipulating ops.
 486  */
 487 static __be32
 488 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 489             union nfsd4_op_u *u)
 490 {
 491         if (!cstate->current_fh.fh_dentry)
 492                 return nfserr_nofilehandle;
 493
 494         u->getfh = &cstate->current_fh;
 495         return nfs_ok;
 496 }
 497
 498 static __be32
 499 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 500             union nfsd4_op_u *u)
 501 {
 502         struct nfsd4_putfh *putfh = &u->putfh;
 503
 504         fh_put(&cstate->current_fh);
 505         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 506         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 507                putfh->pf_fhlen);
 508         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 509 }
 510
 511 static __be32
 512 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 513                 union nfsd4_op_u *u)
 514 {
 515         __be32 status;
 516
 517         fh_put(&cstate->current_fh);
 518         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 519         return status;
 520 }
 521
 522 static __be32
 523 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 524                 union nfsd4_op_u *u)
 525 {
 526         if (!cstate->save_fh.fh_dentry)
 527                 return nfserr_restorefh;
 528
 529         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 530         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 531                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 532                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 533         }
 534         return nfs_ok;
 535 }
 536
 537 static __be32
 538 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 539              union nfsd4_op_u *u)
 540 {
 541         if (!cstate->current_fh.fh_dentry)
 542                 return nfserr_nofilehandle;
 543
 544         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 545         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 546                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 547                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 548         }
 549         return nfs_ok;
 550 }
 551
 552 /*
 553  * misc nfsv4 ops
 554  */
 555 static __be32
 556 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 557              union nfsd4_op_u *u)
 558 {
 559         struct nfsd4_access *access = &u->access;
 560
 561         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 562                 return nfserr_inval;
 563
 564         access->ac_resp_access = access->ac_req_access;
 565         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 566                            &access->ac_supported);
 567 }
 568
 569 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 570 {
 571         __be32 verf[2];
 572         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 573
 574         /*
 575          * This is opaque to client, so no need to byte-swap. Use
 576          * __force to keep sparse happy
 577          */
 578         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 579         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 580         memcpy(verifier->data, verf, sizeof(verifier->data));
 581 }
 582
 583 static __be32
 584 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 585              union nfsd4_op_u *u)
 586 {
 587         struct nfsd4_commit *commit = &u->commit;
 588
 589         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 590         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 591                              commit->co_count);
 592 }
 593
 594 static __be32
 595 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 596              union nfsd4_op_u *u)
 597 {
 598         struct nfsd4_create *create = &u->create;
 599         struct svc_fh resfh;
 600         __be32 status;
 601         dev_t rdev;
 602
 603         fh_init(&resfh, NFS4_FHSIZE);
 604
 605         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 606         if (status)
 607                 return status;
 608
 609         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 610                                     nfsd_attrmask);
 611         if (status)
 612                 return status;
 613
 614         current->fs->umask = create->cr_umask;
 615         switch (create->cr_type) {
 616         case NF4LNK:
 617                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 618                                       create->cr_name, create->cr_namelen,
 619                                       create->cr_data, &resfh);
 620                 break;
 621
 622         case NF4BLK:
 623                 status = nfserr_inval;
 624                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 625                 if (MAJOR(rdev) != create->cr_specdata1 ||
 626                     MINOR(rdev) != create->cr_specdata2)
 627                         goto out_umask;
 628                 status = nfsd_create(rqstp, &cstate->current_fh,
 629                                      create->cr_name, create->cr_namelen,
 630                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 631                 break;
 632
 633         case NF4CHR:
 634                 status = nfserr_inval;
 635                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 636                 if (MAJOR(rdev) != create->cr_specdata1 ||
 637                     MINOR(rdev) != create->cr_specdata2)
 638                         goto out_umask;
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 642                 break;
 643
 644         case NF4SOCK:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 648                 break;
 649
 650         case NF4FIFO:
 651                 status = nfsd_create(rqstp, &cstate->current_fh,
 652                                      create->cr_name, create->cr_namelen,
 653                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 654                 break;
 655
 656         case NF4DIR:
 657                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 658                 status = nfsd_create(rqstp, &cstate->current_fh,
 659                                      create->cr_name, create->cr_namelen,
 660                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 661                 break;
 662
 663         default:
 664                 status = nfserr_badtype;
 665         }
 666
 667         if (status)
 668                 goto out;
 669
 670         if (create->cr_label.len)
 671                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 672
 673         if (create->cr_acl != NULL)
 674                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 675                                 create->cr_bmval);
 676
 677         fh_unlock(&cstate->current_fh);
 678         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 679         fh_dup2(&cstate->current_fh, &resfh);
 680 out:
 681         fh_put(&resfh);
 682 out_umask:
 683         current->fs->umask = 0;
 684         return status;
 685 }
 686
 687 static __be32
 688 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 689               union nfsd4_op_u *u)
 690 {
 691         struct nfsd4_getattr *getattr = &u->getattr;
 692         __be32 status;
 693
 694         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 695         if (status)
 696                 return status;
 697
 698         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 699                 return nfserr_inval;
 700
 701         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 702         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 703         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 704
 705         getattr->ga_fhp = &cstate->current_fh;
 706         return nfs_ok;
 707 }
 708
 709 static __be32
 710 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 711            union nfsd4_op_u *u)
 712 {
 713         struct nfsd4_link *link = &u->link;
 714         __be32 status = nfserr_nofilehandle;
 715
 716         if (!cstate->save_fh.fh_dentry)
 717                 return status;
 718         status = nfsd_link(rqstp, &cstate->current_fh,
 719                            link->li_name, link->li_namelen, &cstate->save_fh);
 720         if (!status)
 721                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 722         return status;
 723 }
 724
 725 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 726 {
 727         struct svc_fh tmp_fh;
 728         __be32 ret;
 729
 730         fh_init(&tmp_fh, NFS4_FHSIZE);
 731         ret = exp_pseudoroot(rqstp, &tmp_fh);
 732         if (ret)
 733                 return ret;
 734         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 735                 fh_put(&tmp_fh);
 736                 return nfserr_noent;
 737         }
 738         fh_put(&tmp_fh);
 739         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 740 }
 741
 742 static __be32
 743 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 744               union nfsd4_op_u *u)
 745 {
 746         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 747 }
 748
 749 static __be32
 750 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 751              union nfsd4_op_u *u)
 752 {
 753         return nfsd_lookup(rqstp, &cstate->current_fh,
 754                            u->lookup.lo_name, u->lookup.lo_len,
 755                            &cstate->current_fh);
 756 }
 757
 758 static __be32
 759 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 760            union nfsd4_op_u *u)
 761 {
 762         struct nfsd4_read *read = &u->read;
 763         __be32 status;
 764
 765         read->rd_filp = NULL;
 766         if (read->rd_offset >= OFFSET_MAX)
 767                 return nfserr_inval;
 768
 769         /*
 770          * If we do a zero copy read, then a client will see read data
 771          * that reflects the state of the file *after* performing the
 772          * following compound.
 773          *
 774          * To ensure proper ordering, we therefore turn off zero copy if
 775          * the client wants us to do more in this compound:
 776          */
 777         if (!nfsd4_last_compound_op(rqstp))
 778                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 779
 780         /* check stateid */
 781         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 782                                         &read->rd_stateid, RD_STATE,
 783                                         &read->rd_filp, &read->rd_tmp_file);
 784         if (status) {
 785                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 786                 goto out;
 787         }
 788         status = nfs_ok;
 789 out:
 790         read->rd_rqstp = rqstp;
 791         read->rd_fhp = &cstate->current_fh;
 792         return status;
 793 }
 794
 795
 796 static void
 797 nfsd4_read_release(union nfsd4_op_u *u)
 798 {
 799         if (u->read.rd_filp)
 800                 fput(u->read.rd_filp);
 801 }
 802
 803 static __be32
 804 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 805               union nfsd4_op_u *u)
 806 {
 807         struct nfsd4_readdir *readdir = &u->readdir;
 808         u64 cookie = readdir->rd_cookie;
 809         static const nfs4_verifier zeroverf;
 810
 811         /* no need to check permission - this will be done in nfsd_readdir() */
 812
 813         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 814                 return nfserr_inval;
 815
 816         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 817         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 818         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 819
 820         if ((cookie == 1) || (cookie == 2) ||
 821             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 822                 return nfserr_bad_cookie;
 823
 824         readdir->rd_rqstp = rqstp;
 825         readdir->rd_fhp = &cstate->current_fh;
 826         return nfs_ok;
 827 }
 828
 829 static __be32
 830 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 831                union nfsd4_op_u *u)
 832 {
 833         u->readlink.rl_rqstp = rqstp;
 834         u->readlink.rl_fhp = &cstate->current_fh;
 835         return nfs_ok;
 836 }
 837
 838 static __be32
 839 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 840              union nfsd4_op_u *u)
 841 {
 842         struct nfsd4_remove *remove = &u->remove;
 843         __be32 status;
 844
 845         if (opens_in_grace(SVC_NET(rqstp)))
 846                 return nfserr_grace;
 847         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 848                              remove->rm_name, remove->rm_namelen);
 849         if (!status) {
 850                 fh_unlock(&cstate->current_fh);
 851                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 852         }
 853         return status;
 854 }
 855
 856 static __be32
 857 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 858              union nfsd4_op_u *u)
 859 {
 860         struct nfsd4_rename *rename = &u->rename;
 861         __be32 status = nfserr_nofilehandle;
 862
 863         if (!cstate->save_fh.fh_dentry)
 864                 return status;
 865         if (opens_in_grace(SVC_NET(rqstp)) &&
 866                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 867                 return nfserr_grace;
 868         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 869                              rename->rn_snamelen, &cstate->current_fh,
 870                              rename->rn_tname, rename->rn_tnamelen);
 871         if (status)
 872                 return status;
 873         set_change_info(&rename->rn_sinfo, &cstate->save_fh);
 874         set_change_info(&rename->rn_tinfo, &cstate->current_fh);
 875         return nfs_ok;
 876 }
 877
 878 static __be32
 879 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 880               union nfsd4_op_u *u)
 881 {
 882         struct nfsd4_secinfo *secinfo = &u->secinfo;
 883         struct svc_export *exp;
 884         struct dentry *dentry;
 885         __be32 err;
 886
 887         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 888         if (err)
 889                 return err;
 890         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 891                                     secinfo->si_name, secinfo->si_namelen,
 892                                     &exp, &dentry);
 893         if (err)
 894                 return err;
 895         fh_unlock(&cstate->current_fh);
 896         if (d_really_is_negative(dentry)) {
 897                 exp_put(exp);
 898                 err = nfserr_noent;
 899         } else
 900                 secinfo->si_exp = exp;
 901         dput(dentry);
 902         if (cstate->minorversion)
 903                 /* See rfc 5661 section 2.6.3.1.1.8 */
 904                 fh_put(&cstate->current_fh);
 905         return err;
 906 }
 907
 908 static __be32
 909 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 910                 union nfsd4_op_u *u)
 911 {
 912         __be32 err;
 913
 914         switch (u->secinfo_no_name.sin_style) {
 915         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 916                 break;
 917         case NFS4_SECINFO_STYLE4_PARENT:
 918                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 919                 if (err)
 920                         return err;
 921                 break;
 922         default:
 923                 return nfserr_inval;
 924         }
 925
 926         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 927         fh_put(&cstate->current_fh);
 928         return nfs_ok;
 929 }
 930
 931 static void
 932 nfsd4_secinfo_release(union nfsd4_op_u *u)
 933 {
 934         if (u->secinfo.si_exp)
 935                 exp_put(u->secinfo.si_exp);
 936 }
 937
 938 static void
 939 nfsd4_secinfo_no_name_release(union nfsd4_op_u *u)
 940 {
 941         if (u->secinfo_no_name.sin_exp)
 942                 exp_put(u->secinfo_no_name.sin_exp);
 943 }
 944
 945 static __be32
 946 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 947               union nfsd4_op_u *u)
 948 {
 949         struct nfsd4_setattr *setattr = &u->setattr;
 950         __be32 status = nfs_ok;
 951         int err;
 952
 953         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 954                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 955                                 &cstate->current_fh, &setattr->sa_stateid,
 956                                 WR_STATE, NULL, NULL);
 957                 if (status) {
 958                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 959                         return status;
 960                 }
 961         }
 962         err = fh_want_write(&cstate->current_fh);
 963         if (err)
 964                 return nfserrno(err);
 965         status = nfs_ok;
 966
 967         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 968                                     nfsd_attrmask);
 969         if (status)
 970                 goto out;
 971
 972         if (setattr->sa_acl != NULL)
 973                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 974                                             setattr->sa_acl);
 975         if (status)
 976                 goto out;
 977         if (setattr->sa_label.len)
 978                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 979                                 &setattr->sa_label);
 980         if (status)
 981                 goto out;
 982         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 983                                 0, (time_t)0);
 984 out:
 985         fh_drop_write(&cstate->current_fh);
 986         return status;
 987 }
 988
 989 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 990 {
 991         int i = 1;
 992         int buflen = write->wr_buflen;
 993
 994         vec[0].iov_base = write->wr_head.iov_base;
 995         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 996         buflen -= vec[0].iov_len;
 997
 998         while (buflen) {
 999                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
1000                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
1001                 buflen -= vec[i].iov_len;
1002                 i++;
1003         }
1004         return i;
1005 }
1006
1007 static __be32
1008 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1009             union nfsd4_op_u *u)
1010 {
1011         struct nfsd4_write *write = &u->write;
1012         stateid_t *stateid = &write->wr_stateid;
1013         struct file *filp = NULL;
1014         __be32 status = nfs_ok;
1015         unsigned long cnt;
1016         int nvecs;
1017
1018         if (write->wr_offset > (u64)OFFSET_MAX ||
1019             write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
1020                 return nfserr_fbig;
1021
1022         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1023                                                 stateid, WR_STATE, &filp, NULL);
1024         if (status) {
1025                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1026                 return status;
1027         }
1028
1029         cnt = write->wr_buflen;
1030         write->wr_how_written = write->wr_stable_how;
1031         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1032
1033         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1034         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1035
1036         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1037                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1038                                 write->wr_how_written);
1039         fput(filp);
1040
1041         write->wr_bytes_written = cnt;
1042
1043         return status;
1044 }
1045
1046 static __be32
1047 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1048                   stateid_t *src_stateid, struct file **src,
1049                   stateid_t *dst_stateid, struct file **dst)
1050 {
1051         __be32 status;
1052
1053         if (!cstate->save_fh.fh_dentry)
1054                 return nfserr_nofilehandle;
1055
1056         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1057                                             src_stateid, RD_STATE, src, NULL);
1058         if (status) {
1059                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1060                 goto out;
1061         }
1062
1063         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1064                                             dst_stateid, WR_STATE, dst, NULL);
1065         if (status) {
1066                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1067                 goto out_put_src;
1068         }
1069
1070         /* fix up for NFS-specific error code */
1071         if (!S_ISREG(file_inode(*src)->i_mode) ||
1072             !S_ISREG(file_inode(*dst)->i_mode)) {
1073                 status = nfserr_wrong_type;
1074                 goto out_put_dst;
1075         }
1076
1077 out:
1078         return status;
1079 out_put_dst:
1080         fput(*dst);
1081 out_put_src:
1082         fput(*src);
1083         goto out;
1084 }
1085
1086 static __be32
1087 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1088                 union nfsd4_op_u *u)
1089 {
1090         struct nfsd4_clone *clone = &u->clone;
1091         struct file *src, *dst;
1092         __be32 status;
1093
1094         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1095                                    &clone->cl_dst_stateid, &dst);
1096         if (status)
1097                 goto out;
1098
1099         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1100                         dst, clone->cl_dst_pos, clone->cl_count);
1101
1102         fput(dst);
1103         fput(src);
1104 out:
1105         return status;
1106 }
1107
1108 static __be32
1109 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1110                 union nfsd4_op_u *u)
1111 {
1112         struct nfsd4_copy *copy = &u->copy;
1113         struct file *src, *dst;
1114         __be32 status;
1115         ssize_t bytes;
1116
1117         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1118                                    &copy->cp_dst_stateid, &dst);
1119         if (status)
1120                 goto out;
1121
1122         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1123                         dst, copy->cp_dst_pos, copy->cp_count);
1124
1125         if (bytes < 0)
1126                 status = nfserrno(bytes);
1127         else {
1128                 copy->cp_res.wr_bytes_written = bytes;
1129                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1130                 copy->cp_consecutive = 1;
1131                 copy->cp_synchronous = 1;
1132                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1133                 status = nfs_ok;
1134         }
1135
1136         fput(src);
1137         fput(dst);
1138 out:
1139         return status;
1140 }
1141
1142 static __be32
1143 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1144                 struct nfsd4_fallocate *fallocate, int flags)
1145 {
1146         __be32 status = nfserr_notsupp;
1147         struct file *file;
1148
1149         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1150                                             &fallocate->falloc_stateid,
1151                                             WR_STATE, &file, NULL);
1152         if (status != nfs_ok) {
1153                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1154                 return status;
1155         }
1156
1157         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1158                                      fallocate->falloc_offset,
1159                                      fallocate->falloc_length,
1160                                      flags);
1161         fput(file);
1162         return status;
1163 }
1164
1165 static __be32
1166 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1167                union nfsd4_op_u *u)
1168 {
1169         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1170 }
1171
1172 static __be32
1173 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1174                  union nfsd4_op_u *u)
1175 {
1176         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1177                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1178 }
1179
1180 static __be32
1181 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1182            union nfsd4_op_u *u)
1183 {
1184         struct nfsd4_seek *seek = &u->seek;
1185         int whence;
1186         __be32 status;
1187         struct file *file;
1188
1189         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1190                                             &seek->seek_stateid,
1191                                             RD_STATE, &file, NULL);
1192         if (status) {
1193                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1194                 return status;
1195         }
1196
1197         switch (seek->seek_whence) {
1198         case NFS4_CONTENT_DATA:
1199                 whence = SEEK_DATA;
1200                 break;
1201         case NFS4_CONTENT_HOLE:
1202                 whence = SEEK_HOLE;
1203                 break;
1204         default:
1205                 status = nfserr_union_notsupp;
1206                 goto out;
1207         }
1208
1209         /*
1210          * Note:  This call does change file->f_pos, but nothing in NFSD
1211          *        should ever file->f_pos.
1212          */
1213         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1214         if (seek->seek_pos < 0)
1215                 status = nfserrno(seek->seek_pos);
1216         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1217                 seek->seek_eof = true;
1218
1219 out:
1220         fput(file);
1221         return status;
1222 }
1223
1224 /* This routine never returns NFS_OK!  If there are no other errors, it
1225  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1226  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1227  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1228  */
1229 static __be32
1230 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1231              struct nfsd4_verify *verify)
1232 {
1233         __be32 *buf, *p;
1234         int count;
1235         __be32 status;
1236
1237         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1238         if (status)
1239                 return status;
1240
1241         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1242         if (status)
1243                 return status;
1244
1245         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1246             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1247                 return nfserr_inval;
1248         if (verify->ve_attrlen & 3)
1249                 return nfserr_inval;
1250
1251         /* count in words:
1252          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1253          */
1254         count = 4 + (verify->ve_attrlen >> 2);
1255         buf = kmalloc(count << 2, GFP_KERNEL);
1256         if (!buf)
1257                 return nfserr_jukebox;
1258
1259         p = buf;
1260         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1261                                     cstate->current_fh.fh_export,
1262                                     cstate->current_fh.fh_dentry,
1263                                     verify->ve_bmval,
1264                                     rqstp, 0);
1265         /*
1266          * If nfsd4_encode_fattr() ran out of space, assume that's because
1267          * the attributes are longer (hence different) than those given:
1268          */
1269         if (status == nfserr_resource)
1270                 status = nfserr_not_same;
1271         if (status)
1272                 goto out_kfree;
1273
1274         /* skip bitmap */
1275         p = buf + 1 + ntohl(buf[0]);
1276         status = nfserr_not_same;
1277         if (ntohl(*p++) != verify->ve_attrlen)
1278                 goto out_kfree;
1279         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1280                 status = nfserr_same;
1281
1282 out_kfree:
1283         kfree(buf);
1284         return status;
1285 }
1286
1287 static __be32
1288 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1289               union nfsd4_op_u *u)
1290 {
1291         __be32 status;
1292
1293         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1294         return status == nfserr_not_same ? nfs_ok : status;
1295 }
1296
1297 static __be32
1298 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1299              union nfsd4_op_u *u)
1300 {
1301         __be32 status;
1302
1303         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1304         return status == nfserr_same ? nfs_ok : status;
1305 }
1306
1307 #ifdef CONFIG_NFSD_PNFS
1308 static const struct nfsd4_layout_ops *
1309 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1310 {
1311         if (!exp->ex_layout_types) {
1312                 dprintk("%s: export does not support pNFS\n", __func__);
1313                 return NULL;
1314         }
1315
1316         if (layout_type >= LAYOUT_TYPE_MAX ||
1317             !(exp->ex_layout_types & (1 << layout_type))) {
1318                 dprintk("%s: layout type %d not supported\n",
1319                         __func__, layout_type);
1320                 return NULL;
1321         }
1322
1323         return nfsd4_layout_ops[layout_type];
1324 }
1325
1326 static __be32
1327 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1328                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1329 {
1330         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1331         const struct nfsd4_layout_ops *ops;
1332         struct nfsd4_deviceid_map *map;
1333         struct svc_export *exp;
1334         __be32 nfserr;
1335
1336         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1337                __func__,
1338                gdp->gd_layout_type,
1339                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1340                gdp->gd_maxcount);
1341
1342         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1343         if (!map) {
1344                 dprintk("%s: couldn't find device ID to export mapping!\n",
1345                         __func__);
1346                 return nfserr_noent;
1347         }
1348
1349         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1350         if (IS_ERR(exp)) {
1351                 dprintk("%s: could not find device id\n", __func__);
1352                 return nfserr_noent;
1353         }
1354
1355         nfserr = nfserr_layoutunavailable;
1356         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1357         if (!ops)
1358                 goto out;
1359
1360         nfserr = nfs_ok;
1361         if (gdp->gd_maxcount != 0) {
1362                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1363                                 rqstp, cstate->session->se_client, gdp);
1364         }
1365
1366         gdp->gd_notify_types &= ops->notify_types;
1367 out:
1368         exp_put(exp);
1369         return nfserr;
1370 }
1371
1372 static void
1373 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1374 {
1375         kfree(u->getdeviceinfo.gd_device);
1376 }
1377
1378 static __be32
1379 nfsd4_layoutget(struct svc_rqst *rqstp,
1380                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1381 {
1382         struct nfsd4_layoutget *lgp = &u->layoutget;
1383         struct svc_fh *current_fh = &cstate->current_fh;
1384         const struct nfsd4_layout_ops *ops;
1385         struct nfs4_layout_stateid *ls;
1386         __be32 nfserr;
1387         int accmode = NFSD_MAY_READ_IF_EXEC;
1388
1389         switch (lgp->lg_seg.iomode) {
1390         case IOMODE_READ:
1391                 accmode |= NFSD_MAY_READ;
1392                 break;
1393         case IOMODE_RW:
1394                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1395                 break;
1396         default:
1397                 dprintk("%s: invalid iomode %d\n",
1398                         __func__, lgp->lg_seg.iomode);
1399                 nfserr = nfserr_badiomode;
1400                 goto out;
1401         }
1402
1403         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1404         if (nfserr)
1405                 goto out;
1406
1407         nfserr = nfserr_layoutunavailable;
1408         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1409         if (!ops)
1410                 goto out;
1411
1412         /*
1413          * Verify minlength and range as per RFC5661:
1414          *  o  If loga_length is less than loga_minlength,
1415          *     the metadata server MUST return NFS4ERR_INVAL.
1416          *  o  If the sum of loga_offset and loga_minlength exceeds
1417          *     NFS4_UINT64_MAX, and loga_minlength is not
1418          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1419          *  o  If the sum of loga_offset and loga_length exceeds
1420          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1421          *     the error NFS4ERR_INVAL MUST result.
1422          */
1423         nfserr = nfserr_inval;
1424         if (lgp->lg_seg.length < lgp->lg_minlength ||
1425             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1426              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1427             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1428              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1429                 goto out;
1430         if (lgp->lg_seg.length == 0)
1431                 goto out;
1432
1433         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1434                                                 true, lgp->lg_layout_type, &ls);
1435         if (nfserr) {
1436                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1437                 goto out;
1438         }
1439
1440         nfserr = nfserr_recallconflict;
1441         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1442                 goto out_put_stid;
1443
1444         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1445                                      current_fh, lgp);
1446         if (nfserr)
1447                 goto out_put_stid;
1448
1449         nfserr = nfsd4_insert_layout(lgp, ls);
1450
1451 out_put_stid:
1452         mutex_unlock(&ls->ls_mutex);
1453         nfs4_put_stid(&ls->ls_stid);
1454 out:
1455         return nfserr;
1456 }
1457
1458 static void
1459 nfsd4_layoutget_release(union nfsd4_op_u *u)
1460 {
1461         kfree(u->layoutget.lg_content);
1462 }
1463
1464 static __be32
1465 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1466                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1467 {
1468         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1469         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1470         struct svc_fh *current_fh = &cstate->current_fh;
1471         const struct nfsd4_layout_ops *ops;
1472         loff_t new_size = lcp->lc_last_wr + 1;
1473         struct inode *inode;
1474         struct nfs4_layout_stateid *ls;
1475         __be32 nfserr;
1476
1477         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1478         if (nfserr)
1479                 goto out;
1480
1481         nfserr = nfserr_layoutunavailable;
1482         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1483         if (!ops)
1484                 goto out;
1485         inode = d_inode(current_fh->fh_dentry);
1486
1487         nfserr = nfserr_inval;
1488         if (new_size <= seg->offset) {
1489                 dprintk("pnfsd: last write before layout segment\n");
1490                 goto out;
1491         }
1492         if (new_size > seg->offset + seg->length) {
1493                 dprintk("pnfsd: last write beyond layout segment\n");
1494                 goto out;
1495         }
1496         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1497                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1498                 goto out;
1499         }
1500
1501         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1502                                                 false, lcp->lc_layout_type,
1503                                                 &ls);
1504         if (nfserr) {
1505                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1506                 /* fixup error code as per RFC5661 */
1507                 if (nfserr == nfserr_bad_stateid)
1508                         nfserr = nfserr_badlayout;
1509                 goto out;
1510         }
1511
1512         /* LAYOUTCOMMIT does not require any serialization */
1513         mutex_unlock(&ls->ls_mutex);
1514
1515         if (new_size > i_size_read(inode)) {
1516                 lcp->lc_size_chg = 1;
1517                 lcp->lc_newsize = new_size;
1518         } else {
1519                 lcp->lc_size_chg = 0;
1520         }
1521
1522         nfserr = ops->proc_layoutcommit(inode, lcp);
1523         nfs4_put_stid(&ls->ls_stid);
1524 out:
1525         return nfserr;
1526 }
1527
1528 static __be32
1529 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1530                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1531 {
1532         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1533         struct svc_fh *current_fh = &cstate->current_fh;
1534         __be32 nfserr;
1535
1536         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1537         if (nfserr)
1538                 goto out;
1539
1540         nfserr = nfserr_layoutunavailable;
1541         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1542                 goto out;
1543
1544         switch (lrp->lr_seg.iomode) {
1545         case IOMODE_READ:
1546         case IOMODE_RW:
1547         case IOMODE_ANY:
1548                 break;
1549         default:
1550                 dprintk("%s: invalid iomode %d\n", __func__,
1551                         lrp->lr_seg.iomode);
1552                 nfserr = nfserr_inval;
1553                 goto out;
1554         }
1555
1556         switch (lrp->lr_return_type) {
1557         case RETURN_FILE:
1558                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1559                 break;
1560         case RETURN_FSID:
1561         case RETURN_ALL:
1562                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1563                 break;
1564         default:
1565                 dprintk("%s: invalid return_type %d\n", __func__,
1566                         lrp->lr_return_type);
1567                 nfserr = nfserr_inval;
1568                 break;
1569         }
1570 out:
1571         return nfserr;
1572 }
1573 #endif /* CONFIG_NFSD_PNFS */
1574
1575 /*
1576  * NULL call.
1577  */
1578 static __be32
1579 nfsd4_proc_null(struct svc_rqst *rqstp)
1580 {
1581         return nfs_ok;
1582 }
1583
1584 static inline void nfsd4_increment_op_stats(u32 opnum)
1585 {
1586         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1587                 nfsdstats.nfs4_opcount[opnum]++;
1588 }
1589
1590 static const struct nfsd4_operation nfsd4_ops[];
1591
1592 static const char *nfsd4_op_name(unsigned opnum);
1593
1594 /*
1595  * Enforce NFSv4.1 COMPOUND ordering rules:
1596  *
1597  * Also note, enforced elsewhere:
1598  *      - SEQUENCE other than as first op results in
1599  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1600  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1601  *        (Enforced in nfsd4_bind_conn_to_session().)
1602  *      - DESTROY_SESSION must be the final operation in a compound, if
1603  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1604  *        (Enforced in nfsd4_destroy_session().)
1605  */
1606 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1607 {
1608         struct nfsd4_op *op = &args->ops[0];
1609
1610         /* These ordering requirements don't apply to NFSv4.0: */
1611         if (args->minorversion == 0)
1612                 return nfs_ok;
1613         /* This is weird, but OK, not our problem: */
1614         if (args->opcnt == 0)
1615                 return nfs_ok;
1616         if (op->status == nfserr_op_illegal)
1617                 return nfs_ok;
1618         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1619                 return nfserr_op_not_in_session;
1620         if (op->opnum == OP_SEQUENCE)
1621                 return nfs_ok;
1622         if (args->opcnt != 1)
1623                 return nfserr_not_only_op;
1624         return nfs_ok;
1625 }
1626
1627 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1628 {
1629         return &nfsd4_ops[op->opnum];
1630 }
1631
1632 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1633 {
1634         if (op->opnum == OP_ILLEGAL)
1635                 return false;
1636         return OPDESC(op)->op_flags & OP_CACHEME;
1637 }
1638
1639 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1640 {
1641         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1642         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1643         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1644         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1645         const struct nfsd4_operation *thisd = OPDESC(this);
1646         const struct nfsd4_operation *nextd;
1647
1648         /*
1649          * Most ops check wronsec on our own; only the putfh-like ops
1650          * have special rules.
1651          */
1652         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1653                 return false;
1654         /*
1655          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1656          * put-filehandle operation if we're not going to use the
1657          * result:
1658          */
1659         if (argp->opcnt == resp->opcnt)
1660                 return false;
1661         if (next->opnum == OP_ILLEGAL)
1662                 return false;
1663         nextd = OPDESC(next);
1664         /*
1665          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1666          * errors themselves as necessary; others should check for them
1667          * now:
1668          */
1669         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1670 }
1671
1672 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1673                                struct nfsd4_compoundres *resp)
1674 {
1675         struct xdr_stream *xdr = &resp->xdr;
1676         struct xdr_buf *buf = &rqstp->rq_res;
1677         struct kvec *head = buf->head;
1678
1679         xdr->buf = buf;
1680         xdr->iov = head;
1681         xdr->p   = head->iov_base + head->iov_len;
1682         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1683         /* Tail and page_len should be zero at this point: */
1684         buf->len = buf->head[0].iov_len;
1685         xdr->scratch.iov_len = 0;
1686         xdr->page_ptr = buf->pages - 1;
1687         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1688                 - rqstp->rq_auth_slack;
1689 }
1690
1691 /*
1692  * COMPOUND call.
1693  */
1694 static __be32
1695 nfsd4_proc_compound(struct svc_rqst *rqstp)
1696 {
1697         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1698         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1699         struct nfsd4_op *op;
1700         struct nfsd4_compound_state *cstate = &resp->cstate;
1701         struct svc_fh *current_fh = &cstate->current_fh;
1702         struct svc_fh *save_fh = &cstate->save_fh;
1703         __be32          status;
1704
1705         svcxdr_init_encode(rqstp, resp);
1706         resp->tagp = resp->xdr.p;
1707         /* reserve space for: taglen, tag, and opcnt */
1708         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1709         resp->taglen = args->taglen;
1710         resp->tag = args->tag;
1711         resp->rqstp = rqstp;
1712         cstate->minorversion = args->minorversion;
1713         fh_init(current_fh, NFS4_FHSIZE);
1714         fh_init(save_fh, NFS4_FHSIZE);
1715         /*
1716          * Don't use the deferral mechanism for NFSv4; compounds make it
1717          * too hard to avoid non-idempotency problems.
1718          */
1719         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1720
1721         /*
1722          * According to RFC3010, this takes precedence over all other errors.
1723          */
1724         status = nfserr_minor_vers_mismatch;
1725         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1726                 goto out;
1727
1728         status = nfs41_check_op_ordering(args);
1729         if (status) {
1730                 op = &args->ops[0];
1731                 op->status = status;
1732                 resp->opcnt = 1;
1733                 goto encode_op;
1734         }
1735
1736         while (!status && resp->opcnt < args->opcnt) {
1737                 op = &args->ops[resp->opcnt++];
1738
1739                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1740                         resp->opcnt, args->opcnt, op->opnum,
1741                         nfsd4_op_name(op->opnum));
1742                 /*
1743                  * The XDR decode routines may have pre-set op->status;
1744                  * for example, if there is a miscellaneous XDR error
1745                  * it will be set to nfserr_bad_xdr.
1746                  */
1747                 if (op->status) {
1748                         if (op->opnum == OP_OPEN)
1749                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1750                         goto encode_op;
1751                 }
1752
1753                 if (!current_fh->fh_dentry) {
1754                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1755                                 op->status = nfserr_nofilehandle;
1756                                 goto encode_op;
1757                         }
1758                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1759                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1760                         op->status = nfserr_moved;
1761                         goto encode_op;
1762                 }
1763
1764                 fh_clear_wcc(current_fh);
1765
1766                 /* If op is non-idempotent */
1767                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1768                         /*
1769                          * Don't execute this op if we couldn't encode a
1770                          * succesful reply:
1771                          */
1772                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1773                         /*
1774                          * Plus if there's another operation, make sure
1775                          * we'll have space to at least encode an error:
1776                          */
1777                         if (resp->opcnt < args->opcnt)
1778                                 plen += COMPOUND_ERR_SLACK_SPACE;
1779                         op->status = nfsd4_check_resp_size(resp, plen);
1780                 }
1781
1782                 if (op->status)
1783                         goto encode_op;
1784
1785                 if (op->opdesc->op_get_currentstateid)
1786                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1787                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1788
1789                 /* Only from SEQUENCE */
1790                 if (cstate->status == nfserr_replay_cache) {
1791                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1792                         status = op->status;
1793                         goto out;
1794                 }
1795                 if (!op->status) {
1796                         if (op->opdesc->op_set_currentstateid)
1797                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1798
1799                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1800                                 clear_current_stateid(cstate);
1801
1802                         if (need_wrongsec_check(rqstp))
1803                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1804                 }
1805 encode_op:
1806                 if (op->status == nfserr_replay_me) {
1807                         op->replay = &cstate->replay_owner->so_replay;
1808                         nfsd4_encode_replay(&resp->xdr, op);
1809                         status = op->status = op->replay->rp_status;
1810                 } else {
1811                         nfsd4_encode_operation(resp, op);
1812                         status = op->status;
1813                 }
1814
1815                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1816                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1817                         be32_to_cpu(status));
1818
1819                 nfsd4_cstate_clear_replay(cstate);
1820                 nfsd4_increment_op_stats(op->opnum);
1821         }
1822
1823         cstate->status = status;
1824         fh_put(current_fh);
1825         fh_put(save_fh);
1826         BUG_ON(cstate->replay_owner);
1827 out:
1828         /* Reset deferral mechanism for RPC deferrals */
1829         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1830         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1831         return status;
1832 }
1833
1834 #define op_encode_hdr_size              (2)
1835 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1836 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1837 #define op_encode_change_info_maxsz     (5)
1838 #define nfs4_fattr_bitmap_maxsz         (4)
1839
1840 /* We'll fall back on returning no lockowner if run out of space: */
1841 #define op_encode_lockowner_maxsz       (0)
1842 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1843
1844 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1845
1846 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1847 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1848                                          op_encode_ace_maxsz)
1849
1850 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1851
1852 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1853 {
1854         return (op_encode_hdr_size) * sizeof(__be32);
1855 }
1856
1857 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1858 {
1859         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1860 }
1861
1862 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1863 {
1864         /* ac_supported, ac_resp_access */
1865         return (op_encode_hdr_size + 2)* sizeof(__be32);
1866 }
1867
1868 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1869 {
1870         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1871 }
1872
1873 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1874 {
1875         return (op_encode_hdr_size + op_encode_change_info_maxsz
1876                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1877 }
1878
1879 /*
1880  * Note since this is an idempotent operation we won't insist on failing
1881  * the op prematurely if the estimate is too large.  We may turn off splice
1882  * reads unnecessarily.
1883  */
1884 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1885                                       struct nfsd4_op *op)
1886 {
1887         u32 *bmap = op->u.getattr.ga_bmval;
1888         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1889         u32 ret = 0;
1890
1891         if (bmap0 & FATTR4_WORD0_ACL)
1892                 return svc_max_payload(rqstp);
1893         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1894                 return svc_max_payload(rqstp);
1895
1896         if (bmap1 & FATTR4_WORD1_OWNER) {
1897                 ret += IDMAP_NAMESZ + 4;
1898                 bmap1 &= ~FATTR4_WORD1_OWNER;
1899         }
1900         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1901                 ret += IDMAP_NAMESZ + 4;
1902                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1903         }
1904         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1905                 ret += NFS4_FHSIZE + 4;
1906                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1907         }
1908         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1909                 ret += NFS4_MAXLABELLEN + 12;
1910                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1911         }
1912         /*
1913          * Largest of remaining attributes are 16 bytes (e.g.,
1914          * supported_attributes)
1915          */
1916         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1917         /* bitmask, length */
1918         ret += 20;
1919         return ret;
1920 }
1921
1922 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1923 {
1924         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1925 }
1926
1927 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1928 {
1929         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1930                 * sizeof(__be32);
1931 }
1932
1933 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1934 {
1935         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1936                 * sizeof(__be32);
1937 }
1938
1939 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1940 {
1941         return (op_encode_hdr_size + op_encode_stateid_maxsz
1942                 + op_encode_change_info_maxsz + 1
1943                 + nfs4_fattr_bitmap_maxsz
1944                 + op_encode_delegation_maxsz) * sizeof(__be32);
1945 }
1946
1947 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1948 {
1949         u32 maxcount = 0, rlen = 0;
1950
1951         maxcount = svc_max_payload(rqstp);
1952         rlen = min(op->u.read.rd_length, maxcount);
1953
1954         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1955 }
1956
1957 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1958 {
1959         u32 maxcount = 0, rlen = 0;
1960
1961         maxcount = svc_max_payload(rqstp);
1962         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1963
1964         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1965                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1966 }
1967
1968 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1969 {
1970         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1971 }
1972
1973 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1974 {
1975         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1976                 * sizeof(__be32);
1977 }
1978
1979 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1980 {
1981         return (op_encode_hdr_size + op_encode_change_info_maxsz
1982                 + op_encode_change_info_maxsz) * sizeof(__be32);
1983 }
1984
1985 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1986                                        struct nfsd4_op *op)
1987 {
1988         return (op_encode_hdr_size
1989                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1990 }
1991
1992 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1993 {
1994         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1995                 * sizeof(__be32);
1996 }
1997
1998 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1999 {
2000         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
2001 }
2002
2003 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2004 {
2005         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
2006                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
2007 }
2008
2009 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2010 {
2011         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
2012                                                                 sizeof(__be32);
2013 }
2014
2015 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2016 {
2017         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
2018 }
2019
2020 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2021 {
2022         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2023                 1 + 1 + /* eir_flags, spr_how */\
2024                 4 + /* spo_must_enforce & _allow with bitmap */\
2025                 2 + /*eir_server_owner.so_minor_id */\
2026                 /* eir_server_owner.so_major_id<> */\
2027                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2028                 /* eir_server_scope<> */\
2029                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2030                 1 + /* eir_server_impl_id array length */\
2031                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2032 }
2033
2034 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2035 {
2036         return (op_encode_hdr_size + \
2037                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2038                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2039 }
2040
2041 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2042 {
2043         return (op_encode_hdr_size + \
2044                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2045                 2 + /* csr_sequence, csr_flags */\
2046                 op_encode_channel_attrs_maxsz + \
2047                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2048 }
2049
2050 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2051 {
2052         return (op_encode_hdr_size +
2053                 1 /* wr_callback */ +
2054                 op_encode_stateid_maxsz /* wr_callback */ +
2055                 2 /* wr_count */ +
2056                 1 /* wr_committed */ +
2057                 op_encode_verifier_maxsz +
2058                 1 /* cr_consecutive */ +
2059                 1 /* cr_synchronous */) * sizeof(__be32);
2060 }
2061
2062 #ifdef CONFIG_NFSD_PNFS
2063 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2064 {
2065         u32 maxcount = 0, rlen = 0;
2066
2067         maxcount = svc_max_payload(rqstp);
2068         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2069
2070         return (op_encode_hdr_size +
2071                 1 /* gd_layout_type*/ +
2072                 XDR_QUADLEN(rlen) +
2073                 2 /* gd_notify_types */) * sizeof(__be32);
2074 }
2075
2076 /*
2077  * At this stage we don't really know what layout driver will handle the request,
2078  * so we need to define an arbitrary upper bound here.
2079  */
2080 #define MAX_LAYOUT_SIZE         128
2081 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2082 {
2083         return (op_encode_hdr_size +
2084                 1 /* logr_return_on_close */ +
2085                 op_encode_stateid_maxsz +
2086                 1 /* nr of layouts */ +
2087                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2088 }
2089
2090 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2091 {
2092         return (op_encode_hdr_size +
2093                 1 /* locr_newsize */ +
2094                 2 /* ns_size */) * sizeof(__be32);
2095 }
2096
2097 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2098 {
2099         return (op_encode_hdr_size +
2100                 1 /* lrs_stateid */ +
2101                 op_encode_stateid_maxsz) * sizeof(__be32);
2102 }
2103 #endif /* CONFIG_NFSD_PNFS */
2104
2105
2106 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2107 {
2108         return (op_encode_hdr_size + 3) * sizeof(__be32);
2109 }
2110
2111 static const struct nfsd4_operation nfsd4_ops[] = {
2112         [OP_ACCESS] = {
2113                 .op_func = nfsd4_access,
2114                 .op_name = "OP_ACCESS",
2115                 .op_rsize_bop = nfsd4_access_rsize,
2116         },
2117         [OP_CLOSE] = {
2118                 .op_func = nfsd4_close,
2119                 .op_flags = OP_MODIFIES_SOMETHING,
2120                 .op_name = "OP_CLOSE",
2121                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2122                 .op_get_currentstateid = nfsd4_get_closestateid,
2123                 .op_set_currentstateid = nfsd4_set_closestateid,
2124         },
2125         [OP_COMMIT] = {
2126                 .op_func = nfsd4_commit,
2127                 .op_flags = OP_MODIFIES_SOMETHING,
2128                 .op_name = "OP_COMMIT",
2129                 .op_rsize_bop = nfsd4_commit_rsize,
2130         },
2131         [OP_CREATE] = {
2132                 .op_func = nfsd4_create,
2133                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2134                 .op_name = "OP_CREATE",
2135                 .op_rsize_bop = nfsd4_create_rsize,
2136         },
2137         [OP_DELEGRETURN] = {
2138                 .op_func = nfsd4_delegreturn,
2139                 .op_flags = OP_MODIFIES_SOMETHING,
2140                 .op_name = "OP_DELEGRETURN",
2141                 .op_rsize_bop = nfsd4_only_status_rsize,
2142                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2143         },
2144         [OP_GETATTR] = {
2145                 .op_func = nfsd4_getattr,
2146                 .op_flags = ALLOWED_ON_ABSENT_FS,
2147                 .op_rsize_bop = nfsd4_getattr_rsize,
2148                 .op_name = "OP_GETATTR",
2149         },
2150         [OP_GETFH] = {
2151                 .op_func = nfsd4_getfh,
2152                 .op_name = "OP_GETFH",
2153                 .op_rsize_bop = nfsd4_getfh_rsize,
2154         },
2155         [OP_LINK] = {
2156                 .op_func = nfsd4_link,
2157                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2158                                 | OP_CACHEME,
2159                 .op_name = "OP_LINK",
2160                 .op_rsize_bop = nfsd4_link_rsize,
2161         },
2162         [OP_LOCK] = {
2163                 .op_func = nfsd4_lock,
2164                 .op_flags = OP_MODIFIES_SOMETHING |
2165                                 OP_NONTRIVIAL_ERROR_ENCODE,
2166                 .op_name = "OP_LOCK",
2167                 .op_rsize_bop = nfsd4_lock_rsize,
2168                 .op_set_currentstateid = nfsd4_set_lockstateid,
2169         },
2170         [OP_LOCKT] = {
2171                 .op_func = nfsd4_lockt,
2172                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2173                 .op_name = "OP_LOCKT",
2174                 .op_rsize_bop = nfsd4_lock_rsize,
2175         },
2176         [OP_LOCKU] = {
2177                 .op_func = nfsd4_locku,
2178                 .op_flags = OP_MODIFIES_SOMETHING,
2179                 .op_name = "OP_LOCKU",
2180                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2181                 .op_get_currentstateid = nfsd4_get_lockustateid,
2182         },
2183         [OP_LOOKUP] = {
2184                 .op_func = nfsd4_lookup,
2185                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2186                 .op_name = "OP_LOOKUP",
2187                 .op_rsize_bop = nfsd4_only_status_rsize,
2188         },
2189         [OP_LOOKUPP] = {
2190                 .op_func = nfsd4_lookupp,
2191                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2192                 .op_name = "OP_LOOKUPP",
2193                 .op_rsize_bop = nfsd4_only_status_rsize,
2194         },
2195         [OP_NVERIFY] = {
2196                 .op_func = nfsd4_nverify,
2197                 .op_name = "OP_NVERIFY",
2198                 .op_rsize_bop = nfsd4_only_status_rsize,
2199         },
2200         [OP_OPEN] = {
2201                 .op_func = nfsd4_open,
2202                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2203                 .op_name = "OP_OPEN",
2204                 .op_rsize_bop = nfsd4_open_rsize,
2205                 .op_set_currentstateid = nfsd4_set_openstateid,
2206         },
2207         [OP_OPEN_CONFIRM] = {
2208                 .op_func = nfsd4_open_confirm,
2209                 .op_flags = OP_MODIFIES_SOMETHING,
2210                 .op_name = "OP_OPEN_CONFIRM",
2211                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2212         },
2213         [OP_OPEN_DOWNGRADE] = {
2214                 .op_func = nfsd4_open_downgrade,
2215                 .op_flags = OP_MODIFIES_SOMETHING,
2216                 .op_name = "OP_OPEN_DOWNGRADE",
2217                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2218                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2219                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2220         },
2221         [OP_PUTFH] = {
2222                 .op_func = nfsd4_putfh,
2223                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2224                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2225                 .op_name = "OP_PUTFH",
2226                 .op_rsize_bop = nfsd4_only_status_rsize,
2227         },
2228         [OP_PUTPUBFH] = {
2229                 .op_func = nfsd4_putrootfh,
2230                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2231                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2232                 .op_name = "OP_PUTPUBFH",
2233                 .op_rsize_bop = nfsd4_only_status_rsize,
2234         },
2235         [OP_PUTROOTFH] = {
2236                 .op_func = nfsd4_putrootfh,
2237                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2238                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2239                 .op_name = "OP_PUTROOTFH",
2240                 .op_rsize_bop = nfsd4_only_status_rsize,
2241         },
2242         [OP_READ] = {
2243                 .op_func = nfsd4_read,
2244                 .op_release = nfsd4_read_release,
2245                 .op_name = "OP_READ",
2246                 .op_rsize_bop = nfsd4_read_rsize,
2247                 .op_get_currentstateid = nfsd4_get_readstateid,
2248         },
2249         [OP_READDIR] = {
2250                 .op_func = nfsd4_readdir,
2251                 .op_name = "OP_READDIR",
2252                 .op_rsize_bop = nfsd4_readdir_rsize,
2253         },
2254         [OP_READLINK] = {
2255                 .op_func = nfsd4_readlink,
2256                 .op_name = "OP_READLINK",
2257                 .op_rsize_bop = nfsd4_readlink_rsize,
2258         },
2259         [OP_REMOVE] = {
2260                 .op_func = nfsd4_remove,
2261                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2262                 .op_name = "OP_REMOVE",
2263                 .op_rsize_bop = nfsd4_remove_rsize,
2264         },
2265         [OP_RENAME] = {
2266                 .op_func = nfsd4_rename,
2267                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2268                 .op_name = "OP_RENAME",
2269                 .op_rsize_bop = nfsd4_rename_rsize,
2270         },
2271         [OP_RENEW] = {
2272                 .op_func = nfsd4_renew,
2273                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2274                                 | OP_MODIFIES_SOMETHING,
2275                 .op_name = "OP_RENEW",
2276                 .op_rsize_bop = nfsd4_only_status_rsize,
2277
2278         },
2279         [OP_RESTOREFH] = {
2280                 .op_func = nfsd4_restorefh,
2281                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2282                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2283                 .op_name = "OP_RESTOREFH",
2284                 .op_rsize_bop = nfsd4_only_status_rsize,
2285         },
2286         [OP_SAVEFH] = {
2287                 .op_func = nfsd4_savefh,
2288                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2289                 .op_name = "OP_SAVEFH",
2290                 .op_rsize_bop = nfsd4_only_status_rsize,
2291         },
2292         [OP_SECINFO] = {
2293                 .op_func = nfsd4_secinfo,
2294                 .op_release = nfsd4_secinfo_release,
2295                 .op_flags = OP_HANDLES_WRONGSEC,
2296                 .op_name = "OP_SECINFO",
2297                 .op_rsize_bop = nfsd4_secinfo_rsize,
2298         },
2299         [OP_SETATTR] = {
2300                 .op_func = nfsd4_setattr,
2301                 .op_name = "OP_SETATTR",
2302                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2303                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2304                 .op_rsize_bop = nfsd4_setattr_rsize,
2305                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2306         },
2307         [OP_SETCLIENTID] = {
2308                 .op_func = nfsd4_setclientid,
2309                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2310                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2311                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2312                 .op_name = "OP_SETCLIENTID",
2313                 .op_rsize_bop = nfsd4_setclientid_rsize,
2314         },
2315         [OP_SETCLIENTID_CONFIRM] = {
2316                 .op_func = nfsd4_setclientid_confirm,
2317                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2318                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2319                 .op_name = "OP_SETCLIENTID_CONFIRM",
2320                 .op_rsize_bop = nfsd4_only_status_rsize,
2321         },
2322         [OP_VERIFY] = {
2323                 .op_func = nfsd4_verify,
2324                 .op_name = "OP_VERIFY",
2325                 .op_rsize_bop = nfsd4_only_status_rsize,
2326         },
2327         [OP_WRITE] = {
2328                 .op_func = nfsd4_write,
2329                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2330                 .op_name = "OP_WRITE",
2331                 .op_rsize_bop = nfsd4_write_rsize,
2332                 .op_get_currentstateid = nfsd4_get_writestateid,
2333         },
2334         [OP_RELEASE_LOCKOWNER] = {
2335                 .op_func = nfsd4_release_lockowner,
2336                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2337                                 | OP_MODIFIES_SOMETHING,
2338                 .op_name = "OP_RELEASE_LOCKOWNER",
2339                 .op_rsize_bop = nfsd4_only_status_rsize,
2340         },
2341
2342         /* NFSv4.1 operations */
2343         [OP_EXCHANGE_ID] = {
2344                 .op_func = nfsd4_exchange_id,
2345                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2346                                 | OP_MODIFIES_SOMETHING,
2347                 .op_name = "OP_EXCHANGE_ID",
2348                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2349         },
2350         [OP_BACKCHANNEL_CTL] = {
2351                 .op_func = nfsd4_backchannel_ctl,
2352                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2353                 .op_name = "OP_BACKCHANNEL_CTL",
2354                 .op_rsize_bop = nfsd4_only_status_rsize,
2355         },
2356         [OP_BIND_CONN_TO_SESSION] = {
2357                 .op_func = nfsd4_bind_conn_to_session,
2358                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2359                                 | OP_MODIFIES_SOMETHING,
2360                 .op_name = "OP_BIND_CONN_TO_SESSION",
2361                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2362         },
2363         [OP_CREATE_SESSION] = {
2364                 .op_func = nfsd4_create_session,
2365                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2366                                 | OP_MODIFIES_SOMETHING,
2367                 .op_name = "OP_CREATE_SESSION",
2368                 .op_rsize_bop = nfsd4_create_session_rsize,
2369         },
2370         [OP_DESTROY_SESSION] = {
2371                 .op_func = nfsd4_destroy_session,
2372                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2373                                 | OP_MODIFIES_SOMETHING,
2374                 .op_name = "OP_DESTROY_SESSION",
2375                 .op_rsize_bop = nfsd4_only_status_rsize,
2376         },
2377         [OP_SEQUENCE] = {
2378                 .op_func = nfsd4_sequence,
2379                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2380                 .op_name = "OP_SEQUENCE",
2381                 .op_rsize_bop = nfsd4_sequence_rsize,
2382         },
2383         [OP_DESTROY_CLIENTID] = {
2384                 .op_func = nfsd4_destroy_clientid,
2385                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2386                                 | OP_MODIFIES_SOMETHING,
2387                 .op_name = "OP_DESTROY_CLIENTID",
2388                 .op_rsize_bop = nfsd4_only_status_rsize,
2389         },
2390         [OP_RECLAIM_COMPLETE] = {
2391                 .op_func = nfsd4_reclaim_complete,
2392                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2393                 .op_name = "OP_RECLAIM_COMPLETE",
2394                 .op_rsize_bop = nfsd4_only_status_rsize,
2395         },
2396         [OP_SECINFO_NO_NAME] = {
2397                 .op_func = nfsd4_secinfo_no_name,
2398                 .op_release = nfsd4_secinfo_no_name_release,
2399                 .op_flags = OP_HANDLES_WRONGSEC,
2400                 .op_name = "OP_SECINFO_NO_NAME",
2401                 .op_rsize_bop = nfsd4_secinfo_rsize,
2402         },
2403         [OP_TEST_STATEID] = {
2404                 .op_func = nfsd4_test_stateid,
2405                 .op_flags = ALLOWED_WITHOUT_FH,
2406                 .op_name = "OP_TEST_STATEID",
2407                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2408         },
2409         [OP_FREE_STATEID] = {
2410                 .op_func = nfsd4_free_stateid,
2411                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2412                 .op_name = "OP_FREE_STATEID",
2413                 .op_get_currentstateid = nfsd4_get_freestateid,
2414                 .op_rsize_bop = nfsd4_only_status_rsize,
2415         },
2416 #ifdef CONFIG_NFSD_PNFS
2417         [OP_GETDEVICEINFO] = {
2418                 .op_func = nfsd4_getdeviceinfo,
2419                 .op_release = nfsd4_getdeviceinfo_release,
2420                 .op_flags = ALLOWED_WITHOUT_FH,
2421                 .op_name = "OP_GETDEVICEINFO",
2422                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2423         },
2424         [OP_LAYOUTGET] = {
2425                 .op_func = nfsd4_layoutget,
2426                 .op_release = nfsd4_layoutget_release,
2427                 .op_flags = OP_MODIFIES_SOMETHING,
2428                 .op_name = "OP_LAYOUTGET",
2429                 .op_rsize_bop = nfsd4_layoutget_rsize,
2430         },
2431         [OP_LAYOUTCOMMIT] = {
2432                 .op_func = nfsd4_layoutcommit,
2433                 .op_flags = OP_MODIFIES_SOMETHING,
2434                 .op_name = "OP_LAYOUTCOMMIT",
2435                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2436         },
2437         [OP_LAYOUTRETURN] = {
2438                 .op_func = nfsd4_layoutreturn,
2439                 .op_flags = OP_MODIFIES_SOMETHING,
2440                 .op_name = "OP_LAYOUTRETURN",
2441                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2442         },
2443 #endif /* CONFIG_NFSD_PNFS */
2444
2445         /* NFSv4.2 operations */
2446         [OP_ALLOCATE] = {
2447                 .op_func = nfsd4_allocate,
2448                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2449                 .op_name = "OP_ALLOCATE",
2450                 .op_rsize_bop = nfsd4_only_status_rsize,
2451         },
2452         [OP_DEALLOCATE] = {
2453                 .op_func = nfsd4_deallocate,
2454                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2455                 .op_name = "OP_DEALLOCATE",
2456                 .op_rsize_bop = nfsd4_only_status_rsize,
2457         },
2458         [OP_CLONE] = {
2459                 .op_func = nfsd4_clone,
2460                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2461                 .op_name = "OP_CLONE",
2462                 .op_rsize_bop = nfsd4_only_status_rsize,
2463         },
2464         [OP_COPY] = {
2465                 .op_func = nfsd4_copy,
2466                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2467                 .op_name = "OP_COPY",
2468                 .op_rsize_bop = nfsd4_copy_rsize,
2469         },
2470         [OP_SEEK] = {
2471                 .op_func = nfsd4_seek,
2472                 .op_name = "OP_SEEK",
2473                 .op_rsize_bop = nfsd4_seek_rsize,
2474         },
2475 };
2476
2477 /**
2478  * nfsd4_spo_must_allow - Determine if the compound op contains an
2479  * operation that is allowed to be sent with machine credentials
2480  *
2481  * @rqstp: a pointer to the struct svc_rqst
2482  *
2483  * Checks to see if the compound contains a spo_must_allow op
2484  * and confirms that it was sent with the proper machine creds.
2485  */
2486
2487 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2488 {
2489         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2490         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2491         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2492         struct nfsd4_compound_state *cstate = &resp->cstate;
2493         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2494         u32 opiter;
2495
2496         if (!cstate->minorversion)
2497                 return false;
2498
2499         if (cstate->spo_must_allowed == true)
2500                 return true;
2501
2502         opiter = resp->opcnt;
2503         while (opiter < argp->opcnt) {
2504                 this = &argp->ops[opiter++];
2505                 if (test_bit(this->opnum, allow->u.longs) &&
2506                         cstate->clp->cl_mach_cred &&
2507                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2508                         cstate->spo_must_allowed = true;
2509                         return true;
2510                 }
2511         }
2512         cstate->spo_must_allowed = false;
2513         return false;
2514 }
2515
2516 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2517 {
2518         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2519                 return op_encode_hdr_size * sizeof(__be32);
2520
2521         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2522         return OPDESC(op)->op_rsize_bop(rqstp, op);
2523 }
2524
2525 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2526 {
2527         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2528                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2529                         op->opnum, nfsd4_op_name(op->opnum));
2530                 WARN_ON_ONCE(1);
2531         }
2532 }
2533
2534 static const char *nfsd4_op_name(unsigned opnum)
2535 {
2536         if (opnum < ARRAY_SIZE(nfsd4_ops))
2537                 return nfsd4_ops[opnum].op_name;
2538         return "unknown_operation";
2539 }
2540
2541 #define nfsd4_voidres                   nfsd4_voidargs
2542 struct nfsd4_voidargs { int dummy; };
2543
2544 static const struct svc_procedure nfsd_procedures4[2] = {
2545         [NFSPROC4_NULL] = {
2546                 .pc_func = nfsd4_proc_null,
2547                 .pc_encode = nfs4svc_encode_voidres,
2548                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2549                 .pc_ressize = sizeof(struct nfsd4_voidres),
2550                 .pc_cachetype = RC_NOCACHE,
2551                 .pc_xdrressize = 1,
2552         },
2553         [NFSPROC4_COMPOUND] = {
2554                 .pc_func = nfsd4_proc_compound,
2555                 .pc_decode = nfs4svc_decode_compoundargs,
2556                 .pc_encode = nfs4svc_encode_compoundres,
2557                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2558                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2559                 .pc_release = nfsd4_release_compoundargs,
2560                 .pc_cachetype = RC_NOCACHE,
2561                 .pc_xdrressize = NFSD_BUFSIZE/4,
2562         },
2563 };
2564
2565 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2566 const struct svc_version nfsd_version4 = {
2567         .vs_vers                = 4,
2568         .vs_nproc               = 2,
2569         .vs_proc                = nfsd_procedures4,
2570         .vs_count               = nfsd_count3,
2571         .vs_dispatch            = nfsd_dispatch,
2572         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2573         .vs_rpcb_optnl          = true,
2574         .vs_need_cong_ctrl      = true,
2575 };
2576
2577 /*
2578  * Local variables:
2579  *  c-basic-offset: 8
2580  * End:
2581  */