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/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42
  43 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  44
  45 static u32 nfsd_attrmask[] = {
  46         NFSD_WRITEABLE_ATTRS_WORD0,
  47         NFSD_WRITEABLE_ATTRS_WORD1,
  48         NFSD_WRITEABLE_ATTRS_WORD2
  49 };
  50
  51 static u32 nfsd41_ex_attrmask[] = {
  52         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  53         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  54         NFSD_SUPPATTR_EXCLCREAT_WORD2
  55 };
  56
  57 static __be32
  58 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  59                    u32 *bmval, u32 *writable)
  60 {
  61         struct dentry *dentry = cstate->current_fh.fh_dentry;
  62
  63         /*
  64          * Check about attributes are supported by the NFSv4 server or not.
  65          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  66          */
  67         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  68             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  69             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  70                 return nfserr_attrnotsupp;
  71
  72         /*
  73          * Check FATTR4_WORD0_ACL can be supported
  74          * in current environment or not.
  75          */
  76         if (bmval[0] & FATTR4_WORD0_ACL) {
  77                 if (!IS_POSIXACL(dentry->d_inode))
  78                         return nfserr_attrnotsupp;
  79         }
  80
  81         /*
  82          * According to spec, read-only attributes return ERR_INVAL.
  83          */
  84         if (writable) {
  85                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  86                     (bmval[2] & ~writable[2]))
  87                         return nfserr_inval;
  88         }
  89
  90         return nfs_ok;
  91 }
  92
  93 static __be32
  94 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  95         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  96 {
  97         __be32 status = nfs_ok;
  98
  99         if (open->op_create == NFS4_OPEN_CREATE) {
 100                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 101                     || open->op_createmode == NFS4_CREATE_GUARDED)
 102                         status = check_attr_support(rqstp, cstate,
 103                                         open->op_bmval, nfsd_attrmask);
 104                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 105                         status = check_attr_support(rqstp, cstate,
 106                                         open->op_bmval, nfsd41_ex_attrmask);
 107         }
 108
 109         return status;
 110 }
 111
 112 static int
 113 is_create_with_attrs(struct nfsd4_open *open)
 114 {
 115         return open->op_create == NFS4_OPEN_CREATE
 116                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 117                     || open->op_createmode == NFS4_CREATE_GUARDED
 118                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 119 }
 120
 121 /*
 122  * if error occurs when setting the acl, just clear the acl bit
 123  * in the returned attr bitmap.
 124  */
 125 static void
 126 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 127                 struct nfs4_acl *acl, u32 *bmval)
 128 {
 129         __be32 status;
 130
 131         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 132         if (status)
 133                 /*
 134                  * We should probably fail the whole open at this point,
 135                  * but we've already created the file, so it's too late;
 136                  * So this seems the least of evils:
 137                  */
 138                 bmval[0] &= ~FATTR4_WORD0_ACL;
 139 }
 140
 141 static inline void
 142 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 143 {
 144         fh_put(dst);
 145         dget(src->fh_dentry);
 146         if (src->fh_export)
 147                 cache_get(&src->fh_export->h);
 148         *dst = *src;
 149 }
 150
 151 static __be32
 152 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 153 {
 154         __be32 status;
 155
 156         if (open->op_truncate &&
 157                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 158                 return nfserr_inval;
 159
 160         accmode |= NFSD_MAY_READ_IF_EXEC;
 161
 162         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 163                 accmode |= NFSD_MAY_READ;
 164         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 165                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 166         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 167                 accmode |= NFSD_MAY_WRITE;
 168
 169         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 170
 171         return status;
 172 }
 173
 174 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 175 {
 176         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 177
 178         if (S_ISREG(mode))
 179                 return nfs_ok;
 180         if (S_ISDIR(mode))
 181                 return nfserr_isdir;
 182         /*
 183          * Using err_symlink as our catch-all case may look odd; but
 184          * there's no other obvious error for this case in 4.0, and we
 185          * happen to know that it will cause the linux v4 client to do
 186          * the right thing on attempts to open something other than a
 187          * regular file.
 188          */
 189         return nfserr_symlink;
 190 }
 191
 192 static __be32
 193 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 194 {
 195         struct svc_fh resfh;
 196         int accmode;
 197         __be32 status;
 198
 199         fh_init(&resfh, NFS4_FHSIZE);
 200         open->op_truncate = 0;
 201
 202         if (open->op_create) {
 203                 /* FIXME: check session persistence and pnfs flags.
 204                  * The nfsv4.1 spec requires the following semantics:
 205                  *
 206                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 207                  * Reply Cache  | server |                 |
 208                  * -------------+--------+-----------------+--------------------
 209                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 210                  *              |        |                 | (SHOULD)
 211                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 212                  *              |        |                 | (SHOULD NOT)
 213                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 214                  * yes          | no     | GUARDED4        | GUARDED4
 215                  * yes          | yes    | GUARDED4        | GUARDED4
 216                  */
 217
 218                 /*
 219                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 220                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 221                  */
 222                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 223                                         open->op_fname.len, &open->op_iattr,
 224                                         &resfh, open->op_createmode,
 225                                         (u32 *)open->op_verf.data,
 226                                         &open->op_truncate, &open->op_created);
 227
 228                 /*
 229                  * Following rfc 3530 14.2.16, use the returned bitmask
 230                  * to indicate which attributes we used to store the
 231                  * verifier:
 232                  */
 233                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 234                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 235                                                         FATTR4_WORD1_TIME_MODIFY);
 236         } else {
 237                 status = nfsd_lookup(rqstp, current_fh,
 238                                      open->op_fname.data, open->op_fname.len, &resfh);
 239                 fh_unlock(current_fh);
 240         }
 241         if (status)
 242                 goto out;
 243         status = nfsd_check_obj_isreg(&resfh);
 244         if (status)
 245                 goto out;
 246
 247         if (is_create_with_attrs(open) && open->op_acl != NULL)
 248                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 249
 250         set_change_info(&open->op_cinfo, current_fh);
 251         fh_dup2(current_fh, &resfh);
 252
 253         /* set reply cache */
 254         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 255                         &resfh.fh_handle);
 256         accmode = NFSD_MAY_NOP;
 257         if (open->op_created)
 258                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 259         status = do_open_permission(rqstp, current_fh, open, accmode);
 260
 261 out:
 262         fh_put(&resfh);
 263         return status;
 264 }
 265
 266 static __be32
 267 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 268 {
 269         __be32 status;
 270         int accmode = 0;
 271
 272         /* Only reclaims from previously confirmed clients are valid */
 273         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 274                 return status;
 275
 276         /* We don't know the target directory, and therefore can not
 277         * set the change info
 278         */
 279
 280         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 281
 282         /* set replay cache */
 283         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 284                         &current_fh->fh_handle);
 285
 286         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 287                 (open->op_iattr.ia_size == 0);
 288         /*
 289          * In the delegation case, the client is telling us about an
 290          * open that it *already* performed locally, some time ago.  We
 291          * should let it succeed now if possible.
 292          *
 293          * In the case of a CLAIM_FH open, on the other hand, the client
 294          * may be counting on us to enforce permissions (the Linux 4.1
 295          * client uses this for normal opens, for example).
 296          */
 297         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 298                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 299
 300         status = do_open_permission(rqstp, current_fh, open, accmode);
 301
 302         return status;
 303 }
 304
 305 static void
 306 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 307 {
 308         struct nfsd4_sessionid *sid =
 309                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 310
 311         clid->cl_boot = sid->clientid.cl_boot;
 312         clid->cl_id = sid->clientid.cl_id;
 313 }
 314
 315 static __be32
 316 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 317            struct nfsd4_open *open)
 318 {
 319         __be32 status;
 320         struct nfsd4_compoundres *resp;
 321
 322         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 323                 (int)open->op_fname.len, open->op_fname.data,
 324                 open->op_openowner);
 325
 326         /* This check required by spec. */
 327         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 328                 return nfserr_inval;
 329
 330         /* We don't yet support WANT bits: */
 331         open->op_share_access &= NFS4_SHARE_ACCESS_MASK;
 332
 333         open->op_created = 0;
 334         /*
 335          * RFC5661 18.51.3
 336          * Before RECLAIM_COMPLETE done, server should deny new lock
 337          */
 338         if (nfsd4_has_session(cstate) &&
 339             !cstate->session->se_client->cl_firststate &&
 340             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 341                 return nfserr_grace;
 342
 343         if (nfsd4_has_session(cstate))
 344                 copy_clientid(&open->op_clientid, cstate->session);
 345
 346         nfs4_lock_state();
 347
 348         /* check seqid for replay. set nfs4_owner */
 349         resp = rqstp->rq_resp;
 350         status = nfsd4_process_open1(&resp->cstate, open);
 351         if (status == nfserr_replay_me) {
 352                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 353                 fh_put(&cstate->current_fh);
 354                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 355                                 &rp->rp_openfh);
 356                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 357                 if (status)
 358                         dprintk("nfsd4_open: replay failed"
 359                                 " restoring previous filehandle\n");
 360                 else
 361                         status = nfserr_replay_me;
 362         }
 363         if (status)
 364                 goto out;
 365
 366         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 367         if (status)
 368                 goto out;
 369
 370         /* Openowner is now set, so sequence id will get bumped.  Now we need
 371          * these checks before we do any creates: */
 372         status = nfserr_grace;
 373         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 374                 goto out;
 375         status = nfserr_no_grace;
 376         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 377                 goto out;
 378
 379         switch (open->op_claim_type) {
 380                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 381                 case NFS4_OPEN_CLAIM_NULL:
 382                         status = do_open_lookup(rqstp, &cstate->current_fh,
 383                                                 open);
 384                         if (status)
 385                                 goto out;
 386                         break;
 387                 case NFS4_OPEN_CLAIM_PREVIOUS:
 388                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 389                 case NFS4_OPEN_CLAIM_FH:
 390                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 391                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 392                                                  open);
 393                         if (status)
 394                                 goto out;
 395                         break;
 396                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 397                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 398                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 399                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 400                                 open->op_claim_type);
 401                         status = nfserr_notsupp;
 402                         goto out;
 403                 default:
 404                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 405                                 open->op_claim_type);
 406                         status = nfserr_inval;
 407                         goto out;
 408         }
 409         /*
 410          * nfsd4_process_open2() does the actual opening of the file.  If
 411          * successful, it (1) truncates the file if open->op_truncate was
 412          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 413          */
 414         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 415         WARN_ON(status && open->op_created);
 416 out:
 417         nfsd4_cleanup_open_state(open, status);
 418         if (open->op_openowner)
 419                 cstate->replay_owner = &open->op_openowner->oo_owner;
 420         else
 421                 nfs4_unlock_state();
 422         return status;
 423 }
 424
 425 /*
 426  * filehandle-manipulating ops.
 427  */
 428 static __be32
 429 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 430             struct svc_fh **getfh)
 431 {
 432         if (!cstate->current_fh.fh_dentry)
 433                 return nfserr_nofilehandle;
 434
 435         *getfh = &cstate->current_fh;
 436         return nfs_ok;
 437 }
 438
 439 static __be32
 440 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 441             struct nfsd4_putfh *putfh)
 442 {
 443         fh_put(&cstate->current_fh);
 444         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 445         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 446                putfh->pf_fhlen);
 447         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 448 }
 449
 450 static __be32
 451 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 452                 void *arg)
 453 {
 454         __be32 status;
 455
 456         fh_put(&cstate->current_fh);
 457         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 458         return status;
 459 }
 460
 461 static __be32
 462 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 463                 void *arg)
 464 {
 465         if (!cstate->save_fh.fh_dentry)
 466                 return nfserr_restorefh;
 467
 468         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 469         return nfs_ok;
 470 }
 471
 472 static __be32
 473 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 474              void *arg)
 475 {
 476         if (!cstate->current_fh.fh_dentry)
 477                 return nfserr_nofilehandle;
 478
 479         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 480         return nfs_ok;
 481 }
 482
 483 /*
 484  * misc nfsv4 ops
 485  */
 486 static __be32
 487 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 488              struct nfsd4_access *access)
 489 {
 490         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 491                 return nfserr_inval;
 492
 493         access->ac_resp_access = access->ac_req_access;
 494         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 495                            &access->ac_supported);
 496 }
 497
 498 static __be32
 499 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 500              struct nfsd4_commit *commit)
 501 {
 502         u32 *p = (u32 *)commit->co_verf.data;
 503         *p++ = nfssvc_boot.tv_sec;
 504         *p++ = nfssvc_boot.tv_usec;
 505
 506         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 507                              commit->co_count);
 508 }
 509
 510 static __be32
 511 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 512              struct nfsd4_create *create)
 513 {
 514         struct svc_fh resfh;
 515         __be32 status;
 516         dev_t rdev;
 517
 518         fh_init(&resfh, NFS4_FHSIZE);
 519
 520         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 521                            NFSD_MAY_CREATE);
 522         if (status)
 523                 return status;
 524
 525         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 526                                     nfsd_attrmask);
 527         if (status)
 528                 return status;
 529
 530         switch (create->cr_type) {
 531         case NF4LNK:
 532                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 533                                       create->cr_name, create->cr_namelen,
 534                                       create->cr_linkname, create->cr_linklen,
 535                                       &resfh, &create->cr_iattr);
 536                 break;
 537
 538         case NF4BLK:
 539                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 540                 if (MAJOR(rdev) != create->cr_specdata1 ||
 541                     MINOR(rdev) != create->cr_specdata2)
 542                         return nfserr_inval;
 543                 status = nfsd_create(rqstp, &cstate->current_fh,
 544                                      create->cr_name, create->cr_namelen,
 545                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 546                 break;
 547
 548         case NF4CHR:
 549                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 550                 if (MAJOR(rdev) != create->cr_specdata1 ||
 551                     MINOR(rdev) != create->cr_specdata2)
 552                         return nfserr_inval;
 553                 status = nfsd_create(rqstp, &cstate->current_fh,
 554                                      create->cr_name, create->cr_namelen,
 555                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 556                 break;
 557
 558         case NF4SOCK:
 559                 status = nfsd_create(rqstp, &cstate->current_fh,
 560                                      create->cr_name, create->cr_namelen,
 561                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 562                 break;
 563
 564         case NF4FIFO:
 565                 status = nfsd_create(rqstp, &cstate->current_fh,
 566                                      create->cr_name, create->cr_namelen,
 567                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 568                 break;
 569
 570         case NF4DIR:
 571                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 572                 status = nfsd_create(rqstp, &cstate->current_fh,
 573                                      create->cr_name, create->cr_namelen,
 574                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 575                 break;
 576
 577         default:
 578                 status = nfserr_badtype;
 579         }
 580
 581         if (status)
 582                 goto out;
 583
 584         if (create->cr_acl != NULL)
 585                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 586                                 create->cr_bmval);
 587
 588         fh_unlock(&cstate->current_fh);
 589         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 590         fh_dup2(&cstate->current_fh, &resfh);
 591 out:
 592         fh_put(&resfh);
 593         return status;
 594 }
 595
 596 static __be32
 597 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 598               struct nfsd4_getattr *getattr)
 599 {
 600         __be32 status;
 601
 602         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 603         if (status)
 604                 return status;
 605
 606         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 607                 return nfserr_inval;
 608
 609         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 610         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 611         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 612
 613         getattr->ga_fhp = &cstate->current_fh;
 614         return nfs_ok;
 615 }
 616
 617 static __be32
 618 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 619            struct nfsd4_link *link)
 620 {
 621         __be32 status = nfserr_nofilehandle;
 622
 623         if (!cstate->save_fh.fh_dentry)
 624                 return status;
 625         status = nfsd_link(rqstp, &cstate->current_fh,
 626                            link->li_name, link->li_namelen, &cstate->save_fh);
 627         if (!status)
 628                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 629         return status;
 630 }
 631
 632 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 633 {
 634         struct svc_fh tmp_fh;
 635         __be32 ret;
 636
 637         fh_init(&tmp_fh, NFS4_FHSIZE);
 638         ret = exp_pseudoroot(rqstp, &tmp_fh);
 639         if (ret)
 640                 return ret;
 641         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 642                 fh_put(&tmp_fh);
 643                 return nfserr_noent;
 644         }
 645         fh_put(&tmp_fh);
 646         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 647 }
 648
 649 static __be32
 650 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 651               void *arg)
 652 {
 653         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 654 }
 655
 656 static __be32
 657 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 658              struct nfsd4_lookup *lookup)
 659 {
 660         return nfsd_lookup(rqstp, &cstate->current_fh,
 661                            lookup->lo_name, lookup->lo_len,
 662                            &cstate->current_fh);
 663 }
 664
 665 static __be32
 666 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 667            struct nfsd4_read *read)
 668 {
 669         __be32 status;
 670
 671         /* no need to check permission - this will be done in nfsd_read() */
 672
 673         read->rd_filp = NULL;
 674         if (read->rd_offset >= OFFSET_MAX)
 675                 return nfserr_inval;
 676
 677         nfs4_lock_state();
 678         /* check stateid */
 679         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 680                                                  RD_STATE, &read->rd_filp))) {
 681                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 682                 goto out;
 683         }
 684         if (read->rd_filp)
 685                 get_file(read->rd_filp);
 686         status = nfs_ok;
 687 out:
 688         nfs4_unlock_state();
 689         read->rd_rqstp = rqstp;
 690         read->rd_fhp = &cstate->current_fh;
 691         return status;
 692 }
 693
 694 static __be32
 695 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 696               struct nfsd4_readdir *readdir)
 697 {
 698         u64 cookie = readdir->rd_cookie;
 699         static const nfs4_verifier zeroverf;
 700
 701         /* no need to check permission - this will be done in nfsd_readdir() */
 702
 703         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 704                 return nfserr_inval;
 705
 706         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 707         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 708         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 709
 710         if ((cookie == 1) || (cookie == 2) ||
 711             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 712                 return nfserr_bad_cookie;
 713
 714         readdir->rd_rqstp = rqstp;
 715         readdir->rd_fhp = &cstate->current_fh;
 716         return nfs_ok;
 717 }
 718
 719 static __be32
 720 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 721                struct nfsd4_readlink *readlink)
 722 {
 723         readlink->rl_rqstp = rqstp;
 724         readlink->rl_fhp = &cstate->current_fh;
 725         return nfs_ok;
 726 }
 727
 728 static __be32
 729 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 730              struct nfsd4_remove *remove)
 731 {
 732         __be32 status;
 733
 734         if (locks_in_grace())
 735                 return nfserr_grace;
 736         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 737                              remove->rm_name, remove->rm_namelen);
 738         if (!status) {
 739                 fh_unlock(&cstate->current_fh);
 740                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 741         }
 742         return status;
 743 }
 744
 745 static __be32
 746 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 747              struct nfsd4_rename *rename)
 748 {
 749         __be32 status = nfserr_nofilehandle;
 750
 751         if (!cstate->save_fh.fh_dentry)
 752                 return status;
 753         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 754                                         & NFSEXP_NOSUBTREECHECK))
 755                 return nfserr_grace;
 756         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 757                              rename->rn_snamelen, &cstate->current_fh,
 758                              rename->rn_tname, rename->rn_tnamelen);
 759
 760         /* the underlying filesystem returns different error's than required
 761          * by NFSv4. both save_fh and current_fh have been verified.. */
 762         if (status == nfserr_isdir)
 763                 status = nfserr_exist;
 764         else if ((status == nfserr_notdir) &&
 765                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 766                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 767                 status = nfserr_exist;
 768
 769         if (!status) {
 770                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 771                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 772         }
 773         return status;
 774 }
 775
 776 static __be32
 777 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 778               struct nfsd4_secinfo *secinfo)
 779 {
 780         struct svc_fh resfh;
 781         struct svc_export *exp;
 782         struct dentry *dentry;
 783         __be32 err;
 784
 785         fh_init(&resfh, NFS4_FHSIZE);
 786         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 787         if (err)
 788                 return err;
 789         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 790                                     secinfo->si_name, secinfo->si_namelen,
 791                                     &exp, &dentry);
 792         if (err)
 793                 return err;
 794         if (dentry->d_inode == NULL) {
 795                 exp_put(exp);
 796                 err = nfserr_noent;
 797         } else
 798                 secinfo->si_exp = exp;
 799         dput(dentry);
 800         if (cstate->minorversion)
 801                 /* See rfc 5661 section 2.6.3.1.1.8 */
 802                 fh_put(&cstate->current_fh);
 803         return err;
 804 }
 805
 806 static __be32
 807 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 808               struct nfsd4_secinfo_no_name *sin)
 809 {
 810         __be32 err;
 811
 812         switch (sin->sin_style) {
 813         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 814                 break;
 815         case NFS4_SECINFO_STYLE4_PARENT:
 816                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 817                 if (err)
 818                         return err;
 819                 break;
 820         default:
 821                 return nfserr_inval;
 822         }
 823         exp_get(cstate->current_fh.fh_export);
 824         sin->sin_exp = cstate->current_fh.fh_export;
 825         fh_put(&cstate->current_fh);
 826         return nfs_ok;
 827 }
 828
 829 static __be32
 830 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 831               struct nfsd4_setattr *setattr)
 832 {
 833         __be32 status = nfs_ok;
 834         int err;
 835
 836         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 837                 nfs4_lock_state();
 838                 status = nfs4_preprocess_stateid_op(cstate,
 839                         &setattr->sa_stateid, WR_STATE, NULL);
 840                 nfs4_unlock_state();
 841                 if (status) {
 842                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 843                         return status;
 844                 }
 845         }
 846         err = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 847         if (err)
 848                 return nfserrno(err);
 849         status = nfs_ok;
 850
 851         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 852                                     nfsd_attrmask);
 853         if (status)
 854                 goto out;
 855
 856         if (setattr->sa_acl != NULL)
 857                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 858                                             setattr->sa_acl);
 859         if (status)
 860                 goto out;
 861         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 862                                 0, (time_t)0);
 863 out:
 864         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 865         return status;
 866 }
 867
 868 static __be32
 869 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 870             struct nfsd4_write *write)
 871 {
 872         stateid_t *stateid = &write->wr_stateid;
 873         struct file *filp = NULL;
 874         u32 *p;
 875         __be32 status = nfs_ok;
 876         unsigned long cnt;
 877
 878         /* no need to check permission - this will be done in nfsd_write() */
 879
 880         if (write->wr_offset >= OFFSET_MAX)
 881                 return nfserr_inval;
 882
 883         nfs4_lock_state();
 884         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 885         if (status) {
 886                 nfs4_unlock_state();
 887                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 888                 return status;
 889         }
 890         if (filp)
 891                 get_file(filp);
 892         nfs4_unlock_state();
 893
 894         cnt = write->wr_buflen;
 895         write->wr_how_written = write->wr_stable_how;
 896         p = (u32 *)write->wr_verifier.data;
 897         *p++ = nfssvc_boot.tv_sec;
 898         *p++ = nfssvc_boot.tv_usec;
 899
 900         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 901                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 902                              &cnt, &write->wr_how_written);
 903         if (filp)
 904                 fput(filp);
 905
 906         write->wr_bytes_written = cnt;
 907
 908         return status;
 909 }
 910
 911 /* This routine never returns NFS_OK!  If there are no other errors, it
 912  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 913  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 914  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 915  */
 916 static __be32
 917 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 918              struct nfsd4_verify *verify)
 919 {
 920         __be32 *buf, *p;
 921         int count;
 922         __be32 status;
 923
 924         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 925         if (status)
 926                 return status;
 927
 928         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 929         if (status)
 930                 return status;
 931
 932         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 933             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 934                 return nfserr_inval;
 935         if (verify->ve_attrlen & 3)
 936                 return nfserr_inval;
 937
 938         /* count in words:
 939          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 940          */
 941         count = 4 + (verify->ve_attrlen >> 2);
 942         buf = kmalloc(count << 2, GFP_KERNEL);
 943         if (!buf)
 944                 return nfserr_jukebox;
 945
 946         status = nfsd4_encode_fattr(&cstate->current_fh,
 947                                     cstate->current_fh.fh_export,
 948                                     cstate->current_fh.fh_dentry, buf,
 949                                     &count, verify->ve_bmval,
 950                                     rqstp, 0);
 951
 952         /* this means that nfsd4_encode_fattr() ran out of space */
 953         if (status == nfserr_resource && count == 0)
 954                 status = nfserr_not_same;
 955         if (status)
 956                 goto out_kfree;
 957
 958         /* skip bitmap */
 959         p = buf + 1 + ntohl(buf[0]);
 960         status = nfserr_not_same;
 961         if (ntohl(*p++) != verify->ve_attrlen)
 962                 goto out_kfree;
 963         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 964                 status = nfserr_same;
 965
 966 out_kfree:
 967         kfree(buf);
 968         return status;
 969 }
 970
 971 static __be32
 972 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 973               struct nfsd4_verify *verify)
 974 {
 975         __be32 status;
 976
 977         status = _nfsd4_verify(rqstp, cstate, verify);
 978         return status == nfserr_not_same ? nfs_ok : status;
 979 }
 980
 981 static __be32
 982 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 983              struct nfsd4_verify *verify)
 984 {
 985         __be32 status;
 986
 987         status = _nfsd4_verify(rqstp, cstate, verify);
 988         return status == nfserr_same ? nfs_ok : status;
 989 }
 990
 991 /*
 992  * NULL call.
 993  */
 994 static __be32
 995 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 996 {
 997         return nfs_ok;
 998 }
 999
1000 static inline void nfsd4_increment_op_stats(u32 opnum)
1001 {
1002         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1003                 nfsdstats.nfs4_opcount[opnum]++;
1004 }
1005
1006 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1007                               void *);
1008 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1009
1010 enum nfsd4_op_flags {
1011         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1012         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1013         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1014         /* For rfc 5661 section 2.6.3.1.1: */
1015         OP_HANDLES_WRONGSEC = 1 << 3,
1016         OP_IS_PUTFH_LIKE = 1 << 4,
1017         /*
1018          * These are the ops whose result size we estimate before
1019          * encoding, to avoid performing an op then not being able to
1020          * respond or cache a response.  This includes writes and setattrs
1021          * as well as the operations usually called "nonidempotent":
1022          */
1023         OP_MODIFIES_SOMETHING = 1 << 5,
1024         /*
1025          * Cache compounds containing these ops in the xid-based drc:
1026          * We use the DRC for compounds containing non-idempotent
1027          * operations, *except* those that are 4.1-specific (since
1028          * sessions provide their own EOS), and except for stateful
1029          * operations other than setclientid and setclientid_confirm
1030          * (since sequence numbers provide EOS for open, lock, etc in
1031          * the v4.0 case).
1032          */
1033         OP_CACHEME = 1 << 6,
1034 };
1035
1036 struct nfsd4_operation {
1037         nfsd4op_func op_func;
1038         u32 op_flags;
1039         char *op_name;
1040         /* Try to get response size before operation */
1041         nfsd4op_rsize op_rsize_bop;
1042 };
1043
1044 static struct nfsd4_operation nfsd4_ops[];
1045
1046 static const char *nfsd4_op_name(unsigned opnum);
1047
1048 /*
1049  * Enforce NFSv4.1 COMPOUND ordering rules:
1050  *
1051  * Also note, enforced elsewhere:
1052  *      - SEQUENCE other than as first op results in
1053  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1054  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1055  *        (Enforced in nfsd4_bind_conn_to_session().)
1056  *      - DESTROY_SESSION must be the final operation in a compound, if
1057  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1058  *        (Enforced in nfsd4_destroy_session().)
1059  */
1060 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1061 {
1062         struct nfsd4_op *op = &args->ops[0];
1063
1064         /* These ordering requirements don't apply to NFSv4.0: */
1065         if (args->minorversion == 0)
1066                 return nfs_ok;
1067         /* This is weird, but OK, not our problem: */
1068         if (args->opcnt == 0)
1069                 return nfs_ok;
1070         if (op->status == nfserr_op_illegal)
1071                 return nfs_ok;
1072         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1073                 return nfserr_op_not_in_session;
1074         if (op->opnum == OP_SEQUENCE)
1075                 return nfs_ok;
1076         if (args->opcnt != 1)
1077                 return nfserr_not_only_op;
1078         return nfs_ok;
1079 }
1080
1081 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1082 {
1083         return &nfsd4_ops[op->opnum];
1084 }
1085
1086 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1087 {
1088         return OPDESC(op)->op_flags & OP_CACHEME;
1089 }
1090
1091 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1092 {
1093         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1094         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1095         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1096         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1097         struct nfsd4_operation *thisd;
1098         struct nfsd4_operation *nextd;
1099
1100         thisd = OPDESC(this);
1101         /*
1102          * Most ops check wronsec on our own; only the putfh-like ops
1103          * have special rules.
1104          */
1105         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1106                 return false;
1107         /*
1108          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1109          * put-filehandle operation if we're not going to use the
1110          * result:
1111          */
1112         if (argp->opcnt == resp->opcnt)
1113                 return false;
1114         if (next->opnum == OP_ILLEGAL)
1115                 return false;
1116         nextd = OPDESC(next);
1117         /*
1118          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1119          * errors themselves as necessary; others should check for them
1120          * now:
1121          */
1122         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1123 }
1124
1125 /*
1126  * COMPOUND call.
1127  */
1128 static __be32
1129 nfsd4_proc_compound(struct svc_rqst *rqstp,
1130                     struct nfsd4_compoundargs *args,
1131                     struct nfsd4_compoundres *resp)
1132 {
1133         struct nfsd4_op *op;
1134         struct nfsd4_operation *opdesc;
1135         struct nfsd4_compound_state *cstate = &resp->cstate;
1136         int             slack_bytes;
1137         u32             plen = 0;
1138         __be32          status;
1139
1140         resp->xbuf = &rqstp->rq_res;
1141         resp->p = rqstp->rq_res.head[0].iov_base +
1142                                                 rqstp->rq_res.head[0].iov_len;
1143         resp->tagp = resp->p;
1144         /* reserve space for: taglen, tag, and opcnt */
1145         resp->p += 2 + XDR_QUADLEN(args->taglen);
1146         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1147         resp->taglen = args->taglen;
1148         resp->tag = args->tag;
1149         resp->opcnt = 0;
1150         resp->rqstp = rqstp;
1151         resp->cstate.minorversion = args->minorversion;
1152         resp->cstate.replay_owner = NULL;
1153         resp->cstate.session = NULL;
1154         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1155         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1156         /*
1157          * Don't use the deferral mechanism for NFSv4; compounds make it
1158          * too hard to avoid non-idempotency problems.
1159          */
1160         rqstp->rq_usedeferral = 0;
1161
1162         /*
1163          * According to RFC3010, this takes precedence over all other errors.
1164          */
1165         status = nfserr_minor_vers_mismatch;
1166         if (args->minorversion > nfsd_supported_minorversion)
1167                 goto out;
1168
1169         status = nfs41_check_op_ordering(args);
1170         if (status) {
1171                 op = &args->ops[0];
1172                 op->status = status;
1173                 goto encode_op;
1174         }
1175
1176         while (!status && resp->opcnt < args->opcnt) {
1177                 op = &args->ops[resp->opcnt++];
1178
1179                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1180                         resp->opcnt, args->opcnt, op->opnum,
1181                         nfsd4_op_name(op->opnum));
1182                 /*
1183                  * The XDR decode routines may have pre-set op->status;
1184                  * for example, if there is a miscellaneous XDR error
1185                  * it will be set to nfserr_bad_xdr.
1186                  */
1187                 if (op->status)
1188                         goto encode_op;
1189
1190                 /* We must be able to encode a successful response to
1191                  * this operation, with enough room left over to encode a
1192                  * failed response to the next operation.  If we don't
1193                  * have enough room, fail with ERR_RESOURCE.
1194                  */
1195                 slack_bytes = (char *)resp->end - (char *)resp->p;
1196                 if (slack_bytes < COMPOUND_SLACK_SPACE
1197                                 + COMPOUND_ERR_SLACK_SPACE) {
1198                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1199                         op->status = nfserr_resource;
1200                         goto encode_op;
1201                 }
1202
1203                 opdesc = OPDESC(op);
1204
1205                 if (!cstate->current_fh.fh_dentry) {
1206                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1207                                 op->status = nfserr_nofilehandle;
1208                                 goto encode_op;
1209                         }
1210                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1211                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1212                         op->status = nfserr_moved;
1213                         goto encode_op;
1214                 }
1215
1216                 /* If op is non-idempotent */
1217                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1218                         plen = opdesc->op_rsize_bop(rqstp, op);
1219                         /*
1220                          * If there's still another operation, make sure
1221                          * we'll have space to at least encode an error:
1222                          */
1223                         if (resp->opcnt < args->opcnt)
1224                                 plen += COMPOUND_ERR_SLACK_SPACE;
1225                         op->status = nfsd4_check_resp_size(resp, plen);
1226                 }
1227
1228                 if (op->status)
1229                         goto encode_op;
1230
1231                 if (opdesc->op_func)
1232                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1233                 else
1234                         BUG_ON(op->status == nfs_ok);
1235
1236                 if (!op->status && need_wrongsec_check(rqstp))
1237                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1238
1239 encode_op:
1240                 /* Only from SEQUENCE */
1241                 if (resp->cstate.status == nfserr_replay_cache) {
1242                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1243                         status = op->status;
1244                         goto out;
1245                 }
1246                 if (op->status == nfserr_replay_me) {
1247                         op->replay = &cstate->replay_owner->so_replay;
1248                         nfsd4_encode_replay(resp, op);
1249                         status = op->status = op->replay->rp_status;
1250                 } else {
1251                         nfsd4_encode_operation(resp, op);
1252                         status = op->status;
1253                 }
1254
1255                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1256                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1257                         be32_to_cpu(status));
1258
1259                 if (cstate->replay_owner) {
1260                         nfs4_unlock_state();
1261                         cstate->replay_owner = NULL;
1262                 }
1263                 /* XXX Ugh, we need to get rid of this kind of special case: */
1264                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1265                         fput(op->u.read.rd_filp);
1266
1267                 nfsd4_increment_op_stats(op->opnum);
1268         }
1269
1270         resp->cstate.status = status;
1271         fh_put(&resp->cstate.current_fh);
1272         fh_put(&resp->cstate.save_fh);
1273         BUG_ON(resp->cstate.replay_owner);
1274 out:
1275         /* Reset deferral mechanism for RPC deferrals */
1276         rqstp->rq_usedeferral = 1;
1277         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1278         return status;
1279 }
1280
1281 #define op_encode_hdr_size              (2)
1282 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1283 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1284 #define op_encode_change_info_maxsz     (5)
1285 #define nfs4_fattr_bitmap_maxsz         (4)
1286
1287 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1288 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1289
1290 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1291
1292 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1293 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1294                                          op_encode_ace_maxsz)
1295
1296 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1297
1298 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1299 {
1300         return (op_encode_hdr_size) * sizeof(__be32);
1301 }
1302
1303 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1304 {
1305         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1306 }
1307
1308 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1309 {
1310         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1311 }
1312
1313 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1314 {
1315         return (op_encode_hdr_size + op_encode_change_info_maxsz
1316                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1317 }
1318
1319 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1320 {
1321         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1322                 * sizeof(__be32);
1323 }
1324
1325 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1326 {
1327         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1328                 * sizeof(__be32);
1329 }
1330
1331 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1332 {
1333         return (op_encode_hdr_size + op_encode_stateid_maxsz
1334                 + op_encode_change_info_maxsz + 1
1335                 + nfs4_fattr_bitmap_maxsz
1336                 + op_encode_delegation_maxsz) * sizeof(__be32);
1337 }
1338
1339 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1340 {
1341         u32 maxcount = 0, rlen = 0;
1342
1343         maxcount = svc_max_payload(rqstp);
1344         rlen = op->u.read.rd_length;
1345
1346         if (rlen > maxcount)
1347                 rlen = maxcount;
1348
1349         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1350 }
1351
1352 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1353 {
1354         u32 rlen = op->u.readdir.rd_maxcount;
1355
1356         if (rlen > PAGE_SIZE)
1357                 rlen = PAGE_SIZE;
1358
1359         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1360                  * sizeof(__be32) + rlen;
1361 }
1362
1363 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1364 {
1365         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1366                 * sizeof(__be32);
1367 }
1368
1369 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1370 {
1371         return (op_encode_hdr_size + op_encode_change_info_maxsz
1372                 + op_encode_change_info_maxsz) * sizeof(__be32);
1373 }
1374
1375 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1376 {
1377         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1378 }
1379
1380 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1381 {
1382         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1383                                                                 sizeof(__be32);
1384 }
1385
1386 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1387 {
1388         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1389 }
1390
1391 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1392 {
1393         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1394                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1395                 2 + /*eir_server_owner.so_minor_id */\
1396                 /* eir_server_owner.so_major_id<> */\
1397                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1398                 /* eir_server_scope<> */\
1399                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1400                 1 + /* eir_server_impl_id array length */\
1401                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1402 }
1403
1404 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1405 {
1406         return (op_encode_hdr_size + \
1407                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1408                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1409 }
1410
1411 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1412 {
1413         return (op_encode_hdr_size + \
1414                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1415                 2 + /* csr_sequence, csr_flags */\
1416                 op_encode_channel_attrs_maxsz + \
1417                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1418 }
1419
1420 static struct nfsd4_operation nfsd4_ops[] = {
1421         [OP_ACCESS] = {
1422                 .op_func = (nfsd4op_func)nfsd4_access,
1423                 .op_name = "OP_ACCESS",
1424         },
1425         [OP_CLOSE] = {
1426                 .op_func = (nfsd4op_func)nfsd4_close,
1427                 .op_flags = OP_MODIFIES_SOMETHING,
1428                 .op_name = "OP_CLOSE",
1429                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1430         },
1431         [OP_COMMIT] = {
1432                 .op_func = (nfsd4op_func)nfsd4_commit,
1433                 .op_flags = OP_MODIFIES_SOMETHING,
1434                 .op_name = "OP_COMMIT",
1435                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1436         },
1437         [OP_CREATE] = {
1438                 .op_func = (nfsd4op_func)nfsd4_create,
1439                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1440                 .op_name = "OP_CREATE",
1441                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1442         },
1443         [OP_DELEGRETURN] = {
1444                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1445                 .op_flags = OP_MODIFIES_SOMETHING,
1446                 .op_name = "OP_DELEGRETURN",
1447                 .op_rsize_bop = nfsd4_only_status_rsize,
1448         },
1449         [OP_GETATTR] = {
1450                 .op_func = (nfsd4op_func)nfsd4_getattr,
1451                 .op_flags = ALLOWED_ON_ABSENT_FS,
1452                 .op_name = "OP_GETATTR",
1453         },
1454         [OP_GETFH] = {
1455                 .op_func = (nfsd4op_func)nfsd4_getfh,
1456                 .op_name = "OP_GETFH",
1457         },
1458         [OP_LINK] = {
1459                 .op_func = (nfsd4op_func)nfsd4_link,
1460                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1461                                 | OP_CACHEME,
1462                 .op_name = "OP_LINK",
1463                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1464         },
1465         [OP_LOCK] = {
1466                 .op_func = (nfsd4op_func)nfsd4_lock,
1467                 .op_flags = OP_MODIFIES_SOMETHING,
1468                 .op_name = "OP_LOCK",
1469                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1470         },
1471         [OP_LOCKT] = {
1472                 .op_func = (nfsd4op_func)nfsd4_lockt,
1473                 .op_name = "OP_LOCKT",
1474         },
1475         [OP_LOCKU] = {
1476                 .op_func = (nfsd4op_func)nfsd4_locku,
1477                 .op_flags = OP_MODIFIES_SOMETHING,
1478                 .op_name = "OP_LOCKU",
1479                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1480         },
1481         [OP_LOOKUP] = {
1482                 .op_func = (nfsd4op_func)nfsd4_lookup,
1483                 .op_flags = OP_HANDLES_WRONGSEC,
1484                 .op_name = "OP_LOOKUP",
1485         },
1486         [OP_LOOKUPP] = {
1487                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1488                 .op_flags = OP_HANDLES_WRONGSEC,
1489                 .op_name = "OP_LOOKUPP",
1490         },
1491         [OP_NVERIFY] = {
1492                 .op_func = (nfsd4op_func)nfsd4_nverify,
1493                 .op_name = "OP_NVERIFY",
1494         },
1495         [OP_OPEN] = {
1496                 .op_func = (nfsd4op_func)nfsd4_open,
1497                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1498                 .op_name = "OP_OPEN",
1499                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1500         },
1501         [OP_OPEN_CONFIRM] = {
1502                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1503                 .op_flags = OP_MODIFIES_SOMETHING,
1504                 .op_name = "OP_OPEN_CONFIRM",
1505                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1506         },
1507         [OP_OPEN_DOWNGRADE] = {
1508                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1509                 .op_flags = OP_MODIFIES_SOMETHING,
1510                 .op_name = "OP_OPEN_DOWNGRADE",
1511                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1512         },
1513         [OP_PUTFH] = {
1514                 .op_func = (nfsd4op_func)nfsd4_putfh,
1515                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1516                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1517                 .op_name = "OP_PUTFH",
1518                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1519         },
1520         [OP_PUTPUBFH] = {
1521                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1522                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1523                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1524                 .op_name = "OP_PUTPUBFH",
1525                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1526         },
1527         [OP_PUTROOTFH] = {
1528                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1529                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1530                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1531                 .op_name = "OP_PUTROOTFH",
1532                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1533         },
1534         [OP_READ] = {
1535                 .op_func = (nfsd4op_func)nfsd4_read,
1536                 .op_flags = OP_MODIFIES_SOMETHING,
1537                 .op_name = "OP_READ",
1538                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1539         },
1540         [OP_READDIR] = {
1541                 .op_func = (nfsd4op_func)nfsd4_readdir,
1542                 .op_flags = OP_MODIFIES_SOMETHING,
1543                 .op_name = "OP_READDIR",
1544                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1545         },
1546         [OP_READLINK] = {
1547                 .op_func = (nfsd4op_func)nfsd4_readlink,
1548                 .op_name = "OP_READLINK",
1549         },
1550         [OP_REMOVE] = {
1551                 .op_func = (nfsd4op_func)nfsd4_remove,
1552                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1553                 .op_name = "OP_REMOVE",
1554                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1555         },
1556         [OP_RENAME] = {
1557                 .op_func = (nfsd4op_func)nfsd4_rename,
1558                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1559                 .op_name = "OP_RENAME",
1560                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1561         },
1562         [OP_RENEW] = {
1563                 .op_func = (nfsd4op_func)nfsd4_renew,
1564                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1565                                 | OP_MODIFIES_SOMETHING,
1566                 .op_name = "OP_RENEW",
1567                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1568
1569         },
1570         [OP_RESTOREFH] = {
1571                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1572                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1573                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1574                 .op_name = "OP_RESTOREFH",
1575                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1576         },
1577         [OP_SAVEFH] = {
1578                 .op_func = (nfsd4op_func)nfsd4_savefh,
1579                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1580                 .op_name = "OP_SAVEFH",
1581                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1582         },
1583         [OP_SECINFO] = {
1584                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1585                 .op_flags = OP_HANDLES_WRONGSEC,
1586                 .op_name = "OP_SECINFO",
1587         },
1588         [OP_SETATTR] = {
1589                 .op_func = (nfsd4op_func)nfsd4_setattr,
1590                 .op_name = "OP_SETATTR",
1591                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1592                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1593         },
1594         [OP_SETCLIENTID] = {
1595                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1596                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1597                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1598                 .op_name = "OP_SETCLIENTID",
1599                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1600         },
1601         [OP_SETCLIENTID_CONFIRM] = {
1602                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1603                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1604                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1605                 .op_name = "OP_SETCLIENTID_CONFIRM",
1606                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1607         },
1608         [OP_VERIFY] = {
1609                 .op_func = (nfsd4op_func)nfsd4_verify,
1610                 .op_name = "OP_VERIFY",
1611         },
1612         [OP_WRITE] = {
1613                 .op_func = (nfsd4op_func)nfsd4_write,
1614                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1615                 .op_name = "OP_WRITE",
1616                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1617         },
1618         [OP_RELEASE_LOCKOWNER] = {
1619                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1620                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1621                                 | OP_MODIFIES_SOMETHING,
1622                 .op_name = "OP_RELEASE_LOCKOWNER",
1623                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1624         },
1625
1626         /* NFSv4.1 operations */
1627         [OP_EXCHANGE_ID] = {
1628                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1629                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1630                                 | OP_MODIFIES_SOMETHING,
1631                 .op_name = "OP_EXCHANGE_ID",
1632                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1633         },
1634         [OP_BIND_CONN_TO_SESSION] = {
1635                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1636                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1637                                 | OP_MODIFIES_SOMETHING,
1638                 .op_name = "OP_BIND_CONN_TO_SESSION",
1639                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1640         },
1641         [OP_CREATE_SESSION] = {
1642                 .op_func = (nfsd4op_func)nfsd4_create_session,
1643                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1644                                 | OP_MODIFIES_SOMETHING,
1645                 .op_name = "OP_CREATE_SESSION",
1646                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1647         },
1648         [OP_DESTROY_SESSION] = {
1649                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1650                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1651                                 | OP_MODIFIES_SOMETHING,
1652                 .op_name = "OP_DESTROY_SESSION",
1653                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1654         },
1655         [OP_SEQUENCE] = {
1656                 .op_func = (nfsd4op_func)nfsd4_sequence,
1657                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1658                 .op_name = "OP_SEQUENCE",
1659         },
1660         [OP_DESTROY_CLIENTID] = {
1661                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1662                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1663                                 | OP_MODIFIES_SOMETHING,
1664                 .op_name = "OP_DESTROY_CLIENTID",
1665                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1666         },
1667         [OP_RECLAIM_COMPLETE] = {
1668                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1669                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1670                 .op_name = "OP_RECLAIM_COMPLETE",
1671                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1672         },
1673         [OP_SECINFO_NO_NAME] = {
1674                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1675                 .op_flags = OP_HANDLES_WRONGSEC,
1676                 .op_name = "OP_SECINFO_NO_NAME",
1677         },
1678         [OP_TEST_STATEID] = {
1679                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1680                 .op_flags = ALLOWED_WITHOUT_FH,
1681                 .op_name = "OP_TEST_STATEID",
1682         },
1683         [OP_FREE_STATEID] = {
1684                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1685                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1686                 .op_name = "OP_FREE_STATEID",
1687                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1688         },
1689 };
1690
1691 static const char *nfsd4_op_name(unsigned opnum)
1692 {
1693         if (opnum < ARRAY_SIZE(nfsd4_ops))
1694                 return nfsd4_ops[opnum].op_name;
1695         return "unknown_operation";
1696 }
1697
1698 #define nfsd4_voidres                   nfsd4_voidargs
1699 struct nfsd4_voidargs { int dummy; };
1700
1701 static struct svc_procedure             nfsd_procedures4[2] = {
1702         [NFSPROC4_NULL] = {
1703                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1704                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1705                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1706                 .pc_ressize = sizeof(struct nfsd4_voidres),
1707                 .pc_cachetype = RC_NOCACHE,
1708                 .pc_xdrressize = 1,
1709         },
1710         [NFSPROC4_COMPOUND] = {
1711                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1712                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1713                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1714                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1715                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1716                 .pc_release = nfsd4_release_compoundargs,
1717                 .pc_cachetype = RC_NOCACHE,
1718                 .pc_xdrressize = NFSD_BUFSIZE/4,
1719         },
1720 };
1721
1722 struct svc_version      nfsd_version4 = {
1723                 .vs_vers        = 4,
1724                 .vs_nproc       = 2,
1725                 .vs_proc        = nfsd_procedures4,
1726                 .vs_dispatch    = nfsd_dispatch,
1727                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1728 };
1729
1730 /*
1731  * Local variables:
1732  *  c-basic-offset: 8
1733  * End:
1734  */