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   1 /*
   2  *  fs/nfsd/nfs4proc.c
   3  *
   4  *  Server-side procedures for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/param.h>
  39 #include <linux/major.h>
  40 #include <linux/slab.h>
  41 #include <linux/file.h>
  42
  43 #include <linux/sunrpc/svc.h>
  44 #include <linux/nfsd/nfsd.h>
  45 #include <linux/nfsd/cache.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfsd/state.h>
  48 #include <linux/nfsd/xdr4.h>
  49 #include <linux/nfs4_acl.h>
  50 #include <linux/sunrpc/gss_api.h>
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 static inline void
  55 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  56 {
  57         fh_put(dst);
  58         dget(src->fh_dentry);
  59         if (src->fh_export)
  60                 cache_get(&src->fh_export->h);
  61         *dst = *src;
  62 }
  63
  64 static __be32
  65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
  66 {
  67         __be32 status;
  68
  69         if (open->op_truncate &&
  70                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  71                 return nfserr_inval;
  72
  73         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  74                 accmode |= NFSD_MAY_READ;
  75         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
  76                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
  77         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
  78                 accmode |= NFSD_MAY_WRITE;
  79
  80         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  81
  82         return status;
  83 }
  84
  85 static __be32
  86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  87 {
  88         struct svc_fh resfh;
  89         __be32 status;
  90         int created = 0;
  91
  92         fh_init(&resfh, NFS4_FHSIZE);
  93         open->op_truncate = 0;
  94
  95         if (open->op_create) {
  96                 /*
  97                  * Note: create modes (UNCHECKED,GUARDED...) are the same
  98                  * in NFSv4 as in v3.
  99                  */
 100                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 101                                         open->op_fname.len, &open->op_iattr,
 102                                         &resfh, open->op_createmode,
 103                                         (u32 *)open->op_verf.data,
 104                                         &open->op_truncate, &created);
 105
 106                 /*
 107                  * Following rfc 3530 14.2.16, use the returned bitmask
 108                  * to indicate which attributes we used to store the
 109                  * verifier:
 110                  */
 111                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 112                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 113                                                 FATTR4_WORD1_TIME_MODIFY);
 114         } else {
 115                 status = nfsd_lookup(rqstp, current_fh,
 116                                      open->op_fname.data, open->op_fname.len, &resfh);
 117                 fh_unlock(current_fh);
 118         }
 119         if (status)
 120                 goto out;
 121
 122         set_change_info(&open->op_cinfo, current_fh);
 123         fh_dup2(current_fh, &resfh);
 124
 125         /* set reply cache */
 126         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 127                         &resfh.fh_handle);
 128         if (!created)
 129                 status = do_open_permission(rqstp, current_fh, open,
 130                                             NFSD_MAY_NOP);
 131
 132 out:
 133         fh_put(&resfh);
 134         return status;
 135 }
 136
 137 static __be32
 138 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 139 {
 140         __be32 status;
 141
 142         /* Only reclaims from previously confirmed clients are valid */
 143         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 144                 return status;
 145
 146         /* We don't know the target directory, and therefore can not
 147         * set the change info
 148         */
 149
 150         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 151
 152         /* set replay cache */
 153         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 154                         &current_fh->fh_handle);
 155
 156         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 157                 (open->op_iattr.ia_size == 0);
 158
 159         status = do_open_permission(rqstp, current_fh, open,
 160                                     NFSD_MAY_OWNER_OVERRIDE);
 161
 162         return status;
 163 }
 164
 165
 166 static __be32
 167 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 168            struct nfsd4_open *open)
 169 {
 170         __be32 status;
 171         struct nfsd4_compoundres *resp;
 172
 173         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 174                 (int)open->op_fname.len, open->op_fname.data,
 175                 open->op_stateowner);
 176
 177         /* This check required by spec. */
 178         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 179                 return nfserr_inval;
 180
 181         nfs4_lock_state();
 182
 183         /* check seqid for replay. set nfs4_owner */
 184         resp = rqstp->rq_resp;
 185         status = nfsd4_process_open1(&resp->cstate, open);
 186         if (status == nfserr_replay_me) {
 187                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 188                 fh_put(&cstate->current_fh);
 189                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 190                                 &rp->rp_openfh);
 191                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 192                 if (status)
 193                         dprintk("nfsd4_open: replay failed"
 194                                 " restoring previous filehandle\n");
 195                 else
 196                         status = nfserr_replay_me;
 197         }
 198         if (status)
 199                 goto out;
 200
 201         /* Openowner is now set, so sequence id will get bumped.  Now we need
 202          * these checks before we do any creates: */
 203         status = nfserr_grace;
 204         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 205                 goto out;
 206         status = nfserr_no_grace;
 207         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 208                 goto out;
 209
 210         switch (open->op_claim_type) {
 211                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 212                 case NFS4_OPEN_CLAIM_NULL:
 213                         /*
 214                          * (1) set CURRENT_FH to the file being opened,
 215                          * creating it if necessary, (2) set open->op_cinfo,
 216                          * (3) set open->op_truncate if the file is to be
 217                          * truncated after opening, (4) do permission checking.
 218                          */
 219                         status = do_open_lookup(rqstp, &cstate->current_fh,
 220                                                 open);
 221                         if (status)
 222                                 goto out;
 223                         break;
 224                 case NFS4_OPEN_CLAIM_PREVIOUS:
 225                         open->op_stateowner->so_confirmed = 1;
 226                         /*
 227                          * The CURRENT_FH is already set to the file being
 228                          * opened.  (1) set open->op_cinfo, (2) set
 229                          * open->op_truncate if the file is to be truncated
 230                          * after opening, (3) do permission checking.
 231                         */
 232                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 233                                                  open);
 234                         if (status)
 235                                 goto out;
 236                         break;
 237                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 238                         open->op_stateowner->so_confirmed = 1;
 239                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 240                                 open->op_claim_type);
 241                         status = nfserr_notsupp;
 242                         goto out;
 243                 default:
 244                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 245                                 open->op_claim_type);
 246                         status = nfserr_inval;
 247                         goto out;
 248         }
 249         /*
 250          * nfsd4_process_open2() does the actual opening of the file.  If
 251          * successful, it (1) truncates the file if open->op_truncate was
 252          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 253          */
 254         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 255 out:
 256         if (open->op_stateowner) {
 257                 nfs4_get_stateowner(open->op_stateowner);
 258                 cstate->replay_owner = open->op_stateowner;
 259         }
 260         nfs4_unlock_state();
 261         return status;
 262 }
 263
 264 /*
 265  * filehandle-manipulating ops.
 266  */
 267 static __be32
 268 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 269             struct svc_fh **getfh)
 270 {
 271         if (!cstate->current_fh.fh_dentry)
 272                 return nfserr_nofilehandle;
 273
 274         *getfh = &cstate->current_fh;
 275         return nfs_ok;
 276 }
 277
 278 static __be32
 279 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 280             struct nfsd4_putfh *putfh)
 281 {
 282         fh_put(&cstate->current_fh);
 283         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 284         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 285                putfh->pf_fhlen);
 286         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 287 }
 288
 289 static __be32
 290 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 291                 void *arg)
 292 {
 293         __be32 status;
 294
 295         fh_put(&cstate->current_fh);
 296         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 297         return status;
 298 }
 299
 300 static __be32
 301 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 302                 void *arg)
 303 {
 304         if (!cstate->save_fh.fh_dentry)
 305                 return nfserr_restorefh;
 306
 307         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 308         return nfs_ok;
 309 }
 310
 311 static __be32
 312 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 313              void *arg)
 314 {
 315         if (!cstate->current_fh.fh_dentry)
 316                 return nfserr_nofilehandle;
 317
 318         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 319         return nfs_ok;
 320 }
 321
 322 /*
 323  * misc nfsv4 ops
 324  */
 325 static __be32
 326 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 327              struct nfsd4_access *access)
 328 {
 329         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 330                 return nfserr_inval;
 331
 332         access->ac_resp_access = access->ac_req_access;
 333         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 334                            &access->ac_supported);
 335 }
 336
 337 static __be32
 338 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 339              struct nfsd4_commit *commit)
 340 {
 341         __be32 status;
 342
 343         u32 *p = (u32 *)commit->co_verf.data;
 344         *p++ = nfssvc_boot.tv_sec;
 345         *p++ = nfssvc_boot.tv_usec;
 346
 347         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 348                              commit->co_count);
 349         if (status == nfserr_symlink)
 350                 status = nfserr_inval;
 351         return status;
 352 }
 353
 354 static __be32
 355 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 356              struct nfsd4_create *create)
 357 {
 358         struct svc_fh resfh;
 359         __be32 status;
 360         dev_t rdev;
 361
 362         fh_init(&resfh, NFS4_FHSIZE);
 363
 364         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 365                            NFSD_MAY_CREATE);
 366         if (status == nfserr_symlink)
 367                 status = nfserr_notdir;
 368         if (status)
 369                 return status;
 370
 371         switch (create->cr_type) {
 372         case NF4LNK:
 373                 /* ugh! we have to null-terminate the linktext, or
 374                  * vfs_symlink() will choke.  it is always safe to
 375                  * null-terminate by brute force, since at worst we
 376                  * will overwrite the first byte of the create namelen
 377                  * in the XDR buffer, which has already been extracted
 378                  * during XDR decode.
 379                  */
 380                 create->cr_linkname[create->cr_linklen] = 0;
 381
 382                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 383                                       create->cr_name, create->cr_namelen,
 384                                       create->cr_linkname, create->cr_linklen,
 385                                       &resfh, &create->cr_iattr);
 386                 break;
 387
 388         case NF4BLK:
 389                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 390                 if (MAJOR(rdev) != create->cr_specdata1 ||
 391                     MINOR(rdev) != create->cr_specdata2)
 392                         return nfserr_inval;
 393                 status = nfsd_create(rqstp, &cstate->current_fh,
 394                                      create->cr_name, create->cr_namelen,
 395                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 396                 break;
 397
 398         case NF4CHR:
 399                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 400                 if (MAJOR(rdev) != create->cr_specdata1 ||
 401                     MINOR(rdev) != create->cr_specdata2)
 402                         return nfserr_inval;
 403                 status = nfsd_create(rqstp, &cstate->current_fh,
 404                                      create->cr_name, create->cr_namelen,
 405                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 406                 break;
 407
 408         case NF4SOCK:
 409                 status = nfsd_create(rqstp, &cstate->current_fh,
 410                                      create->cr_name, create->cr_namelen,
 411                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 412                 break;
 413
 414         case NF4FIFO:
 415                 status = nfsd_create(rqstp, &cstate->current_fh,
 416                                      create->cr_name, create->cr_namelen,
 417                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 418                 break;
 419
 420         case NF4DIR:
 421                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 422                 status = nfsd_create(rqstp, &cstate->current_fh,
 423                                      create->cr_name, create->cr_namelen,
 424                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 425                 break;
 426
 427         default:
 428                 status = nfserr_badtype;
 429         }
 430
 431         if (!status) {
 432                 fh_unlock(&cstate->current_fh);
 433                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
 434                 fh_dup2(&cstate->current_fh, &resfh);
 435         }
 436
 437         fh_put(&resfh);
 438         return status;
 439 }
 440
 441 static __be32
 442 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 443               struct nfsd4_getattr *getattr)
 444 {
 445         __be32 status;
 446
 447         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 448         if (status)
 449                 return status;
 450
 451         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 452                 return nfserr_inval;
 453
 454         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 455         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 456
 457         getattr->ga_fhp = &cstate->current_fh;
 458         return nfs_ok;
 459 }
 460
 461 static __be32
 462 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 463            struct nfsd4_link *link)
 464 {
 465         __be32 status = nfserr_nofilehandle;
 466
 467         if (!cstate->save_fh.fh_dentry)
 468                 return status;
 469         status = nfsd_link(rqstp, &cstate->current_fh,
 470                            link->li_name, link->li_namelen, &cstate->save_fh);
 471         if (!status)
 472                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 473         return status;
 474 }
 475
 476 static __be32
 477 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 478               void *arg)
 479 {
 480         struct svc_fh tmp_fh;
 481         __be32 ret;
 482
 483         fh_init(&tmp_fh, NFS4_FHSIZE);
 484         ret = exp_pseudoroot(rqstp, &tmp_fh);
 485         if (ret)
 486                 return ret;
 487         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 488                 fh_put(&tmp_fh);
 489                 return nfserr_noent;
 490         }
 491         fh_put(&tmp_fh);
 492         return nfsd_lookup(rqstp, &cstate->current_fh,
 493                            "..", 2, &cstate->current_fh);
 494 }
 495
 496 static __be32
 497 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 498              struct nfsd4_lookup *lookup)
 499 {
 500         return nfsd_lookup(rqstp, &cstate->current_fh,
 501                            lookup->lo_name, lookup->lo_len,
 502                            &cstate->current_fh);
 503 }
 504
 505 static __be32
 506 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 507            struct nfsd4_read *read)
 508 {
 509         __be32 status;
 510
 511         /* no need to check permission - this will be done in nfsd_read() */
 512
 513         read->rd_filp = NULL;
 514         if (read->rd_offset >= OFFSET_MAX)
 515                 return nfserr_inval;
 516
 517         nfs4_lock_state();
 518         /* check stateid */
 519         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 520                                                  RD_STATE, &read->rd_filp))) {
 521                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 522                 goto out;
 523         }
 524         if (read->rd_filp)
 525                 get_file(read->rd_filp);
 526         status = nfs_ok;
 527 out:
 528         nfs4_unlock_state();
 529         read->rd_rqstp = rqstp;
 530         read->rd_fhp = &cstate->current_fh;
 531         return status;
 532 }
 533
 534 static __be32
 535 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 536               struct nfsd4_readdir *readdir)
 537 {
 538         u64 cookie = readdir->rd_cookie;
 539         static const nfs4_verifier zeroverf;
 540
 541         /* no need to check permission - this will be done in nfsd_readdir() */
 542
 543         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 544                 return nfserr_inval;
 545
 546         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 547         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 548
 549         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 550             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 551                 return nfserr_bad_cookie;
 552
 553         readdir->rd_rqstp = rqstp;
 554         readdir->rd_fhp = &cstate->current_fh;
 555         return nfs_ok;
 556 }
 557
 558 static __be32
 559 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 560                struct nfsd4_readlink *readlink)
 561 {
 562         readlink->rl_rqstp = rqstp;
 563         readlink->rl_fhp = &cstate->current_fh;
 564         return nfs_ok;
 565 }
 566
 567 static __be32
 568 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 569              struct nfsd4_remove *remove)
 570 {
 571         __be32 status;
 572
 573         if (locks_in_grace())
 574                 return nfserr_grace;
 575         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 576                              remove->rm_name, remove->rm_namelen);
 577         if (status == nfserr_symlink)
 578                 return nfserr_notdir;
 579         if (!status) {
 580                 fh_unlock(&cstate->current_fh);
 581                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 582         }
 583         return status;
 584 }
 585
 586 static __be32
 587 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 588              struct nfsd4_rename *rename)
 589 {
 590         __be32 status = nfserr_nofilehandle;
 591
 592         if (!cstate->save_fh.fh_dentry)
 593                 return status;
 594         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 595                                         & NFSEXP_NOSUBTREECHECK))
 596                 return nfserr_grace;
 597         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 598                              rename->rn_snamelen, &cstate->current_fh,
 599                              rename->rn_tname, rename->rn_tnamelen);
 600
 601         /* the underlying filesystem returns different error's than required
 602          * by NFSv4. both save_fh and current_fh have been verified.. */
 603         if (status == nfserr_isdir)
 604                 status = nfserr_exist;
 605         else if ((status == nfserr_notdir) &&
 606                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 607                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 608                 status = nfserr_exist;
 609         else if (status == nfserr_symlink)
 610                 status = nfserr_notdir;
 611
 612         if (!status) {
 613                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 614                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 615         }
 616         return status;
 617 }
 618
 619 static __be32
 620 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 621               struct nfsd4_secinfo *secinfo)
 622 {
 623         struct svc_fh resfh;
 624         struct svc_export *exp;
 625         struct dentry *dentry;
 626         __be32 err;
 627
 628         fh_init(&resfh, NFS4_FHSIZE);
 629         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 630                                     secinfo->si_name, secinfo->si_namelen,
 631                                     &exp, &dentry);
 632         if (err)
 633                 return err;
 634         if (dentry->d_inode == NULL) {
 635                 exp_put(exp);
 636                 err = nfserr_noent;
 637         } else
 638                 secinfo->si_exp = exp;
 639         dput(dentry);
 640         return err;
 641 }
 642
 643 static __be32
 644 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 645               struct nfsd4_setattr *setattr)
 646 {
 647         __be32 status = nfs_ok;
 648
 649         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 650                 nfs4_lock_state();
 651                 status = nfs4_preprocess_stateid_op(cstate,
 652                         &setattr->sa_stateid, WR_STATE, NULL);
 653                 nfs4_unlock_state();
 654                 if (status) {
 655                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 656                         return status;
 657                 }
 658         }
 659         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 660         if (status)
 661                 return status;
 662         status = nfs_ok;
 663         if (setattr->sa_acl != NULL)
 664                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 665                                             setattr->sa_acl);
 666         if (status)
 667                 goto out;
 668         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 669                                 0, (time_t)0);
 670 out:
 671         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 672         return status;
 673 }
 674
 675 static __be32
 676 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 677             struct nfsd4_write *write)
 678 {
 679         stateid_t *stateid = &write->wr_stateid;
 680         struct file *filp = NULL;
 681         u32 *p;
 682         __be32 status = nfs_ok;
 683         unsigned long cnt;
 684
 685         /* no need to check permission - this will be done in nfsd_write() */
 686
 687         if (write->wr_offset >= OFFSET_MAX)
 688                 return nfserr_inval;
 689
 690         nfs4_lock_state();
 691         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 692         if (filp)
 693                 get_file(filp);
 694         nfs4_unlock_state();
 695
 696         if (status) {
 697                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 698                 return status;
 699         }
 700
 701         cnt = write->wr_buflen;
 702         write->wr_how_written = write->wr_stable_how;
 703         p = (u32 *)write->wr_verifier.data;
 704         *p++ = nfssvc_boot.tv_sec;
 705         *p++ = nfssvc_boot.tv_usec;
 706
 707         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 708                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 709                              &cnt, &write->wr_how_written);
 710         if (filp)
 711                 fput(filp);
 712
 713         write->wr_bytes_written = cnt;
 714
 715         if (status == nfserr_symlink)
 716                 status = nfserr_inval;
 717         return status;
 718 }
 719
 720 /* This routine never returns NFS_OK!  If there are no other errors, it
 721  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 722  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 723  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 724  */
 725 static __be32
 726 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 727              struct nfsd4_verify *verify)
 728 {
 729         __be32 *buf, *p;
 730         int count;
 731         __be32 status;
 732
 733         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 734         if (status)
 735                 return status;
 736
 737         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 738             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 739                 return nfserr_attrnotsupp;
 740         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 741             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 742                 return nfserr_inval;
 743         if (verify->ve_attrlen & 3)
 744                 return nfserr_inval;
 745
 746         /* count in words:
 747          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 748          */
 749         count = 4 + (verify->ve_attrlen >> 2);
 750         buf = kmalloc(count << 2, GFP_KERNEL);
 751         if (!buf)
 752                 return nfserr_resource;
 753
 754         status = nfsd4_encode_fattr(&cstate->current_fh,
 755                                     cstate->current_fh.fh_export,
 756                                     cstate->current_fh.fh_dentry, buf,
 757                                     &count, verify->ve_bmval,
 758                                     rqstp, 0);
 759
 760         /* this means that nfsd4_encode_fattr() ran out of space */
 761         if (status == nfserr_resource && count == 0)
 762                 status = nfserr_not_same;
 763         if (status)
 764                 goto out_kfree;
 765
 766         p = buf + 3;
 767         status = nfserr_not_same;
 768         if (ntohl(*p++) != verify->ve_attrlen)
 769                 goto out_kfree;
 770         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 771                 status = nfserr_same;
 772
 773 out_kfree:
 774         kfree(buf);
 775         return status;
 776 }
 777
 778 static __be32
 779 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 780               struct nfsd4_verify *verify)
 781 {
 782         __be32 status;
 783
 784         status = _nfsd4_verify(rqstp, cstate, verify);
 785         return status == nfserr_not_same ? nfs_ok : status;
 786 }
 787
 788 static __be32
 789 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 790              struct nfsd4_verify *verify)
 791 {
 792         __be32 status;
 793
 794         status = _nfsd4_verify(rqstp, cstate, verify);
 795         return status == nfserr_same ? nfs_ok : status;
 796 }
 797
 798 /*
 799  * NULL call.
 800  */
 801 static __be32
 802 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 803 {
 804         return nfs_ok;
 805 }
 806
 807 static inline void nfsd4_increment_op_stats(u32 opnum)
 808 {
 809         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 810                 nfsdstats.nfs4_opcount[opnum]++;
 811 }
 812
 813 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 814                               void *);
 815 enum nfsd4_op_flags {
 816         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 817         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
 818         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
 819 };
 820
 821 struct nfsd4_operation {
 822         nfsd4op_func op_func;
 823         u32 op_flags;
 824         char *op_name;
 825 };
 826
 827 static struct nfsd4_operation nfsd4_ops[];
 828
 829 static const char *nfsd4_op_name(unsigned opnum);
 830
 831 /*
 832  * This is a replay of a compound for which no cache entry pages
 833  * were used. Encode the sequence operation, and if cachethis is FALSE
 834  * encode the uncache rep error on the next operation.
 835  */
 836 static __be32
 837 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
 838                          struct nfsd4_compoundres *resp)
 839 {
 840         struct nfsd4_op *op;
 841
 842         dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
 843                 resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
 844
 845         /* Encode the replayed sequence operation */
 846         BUG_ON(resp->opcnt != 1);
 847         op = &args->ops[resp->opcnt - 1];
 848         nfsd4_encode_operation(resp, op);
 849
 850         /*return nfserr_retry_uncached_rep in next operation. */
 851         if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
 852                 op = &args->ops[resp->opcnt++];
 853                 op->status = nfserr_retry_uncached_rep;
 854                 nfsd4_encode_operation(resp, op);
 855         }
 856         return op->status;
 857 }
 858
 859 /*
 860  * Enforce NFSv4.1 COMPOUND ordering rules.
 861  *
 862  * TODO:
 863  * - enforce NFS4ERR_NOT_ONLY_OP,
 864  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
 865  */
 866 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
 867 {
 868         if (args->minorversion && args->opcnt > 0) {
 869                 struct nfsd4_op *op = &args->ops[0];
 870                 return (op->status == nfserr_op_illegal) ||
 871                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
 872         }
 873         return true;
 874 }
 875
 876 /*
 877  * COMPOUND call.
 878  */
 879 static __be32
 880 nfsd4_proc_compound(struct svc_rqst *rqstp,
 881                     struct nfsd4_compoundargs *args,
 882                     struct nfsd4_compoundres *resp)
 883 {
 884         struct nfsd4_op *op;
 885         struct nfsd4_operation *opdesc;
 886         struct nfsd4_compound_state *cstate = &resp->cstate;
 887         int             slack_bytes;
 888         __be32          status;
 889
 890         resp->xbuf = &rqstp->rq_res;
 891         resp->p = rqstp->rq_res.head[0].iov_base +
 892                                                 rqstp->rq_res.head[0].iov_len;
 893         resp->tagp = resp->p;
 894         /* reserve space for: taglen, tag, and opcnt */
 895         resp->p += 2 + XDR_QUADLEN(args->taglen);
 896         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 897         resp->taglen = args->taglen;
 898         resp->tag = args->tag;
 899         resp->opcnt = 0;
 900         resp->rqstp = rqstp;
 901         resp->cstate.replay_owner = NULL;
 902         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
 903         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
 904         /* Use the deferral mechanism only for NFSv4.0 compounds */
 905         rqstp->rq_usedeferral = (args->minorversion == 0);
 906
 907         /*
 908          * According to RFC3010, this takes precedence over all other errors.
 909          */
 910         status = nfserr_minor_vers_mismatch;
 911         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 912                 goto out;
 913
 914         if (!nfs41_op_ordering_ok(args)) {
 915                 op = &args->ops[0];
 916                 op->status = nfserr_sequence_pos;
 917                 goto encode_op;
 918         }
 919
 920         status = nfs_ok;
 921         while (!status && resp->opcnt < args->opcnt) {
 922                 op = &args->ops[resp->opcnt++];
 923
 924                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
 925                         resp->opcnt, args->opcnt, op->opnum,
 926                         nfsd4_op_name(op->opnum));
 927                 /*
 928                  * The XDR decode routines may have pre-set op->status;
 929                  * for example, if there is a miscellaneous XDR error
 930                  * it will be set to nfserr_bad_xdr.
 931                  */
 932                 if (op->status)
 933                         goto encode_op;
 934
 935                 /* We must be able to encode a successful response to
 936                  * this operation, with enough room left over to encode a
 937                  * failed response to the next operation.  If we don't
 938                  * have enough room, fail with ERR_RESOURCE.
 939                  */
 940                 slack_bytes = (char *)resp->end - (char *)resp->p;
 941                 if (slack_bytes < COMPOUND_SLACK_SPACE
 942                                 + COMPOUND_ERR_SLACK_SPACE) {
 943                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 944                         op->status = nfserr_resource;
 945                         goto encode_op;
 946                 }
 947
 948                 opdesc = &nfsd4_ops[op->opnum];
 949
 950                 if (!cstate->current_fh.fh_dentry) {
 951                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 952                                 op->status = nfserr_nofilehandle;
 953                                 goto encode_op;
 954                         }
 955                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 956                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 957                         op->status = nfserr_moved;
 958                         goto encode_op;
 959                 }
 960
 961                 if (opdesc->op_func)
 962                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 963                 else
 964                         BUG_ON(op->status == nfs_ok);
 965
 966 encode_op:
 967                 /* Only from SEQUENCE or CREATE_SESSION */
 968                 if (resp->cstate.status == nfserr_replay_cache) {
 969                         dprintk("%s NFS4.1 replay from cache\n", __func__);
 970                         if (nfsd4_not_cached(resp))
 971                                 status = nfsd4_enc_uncached_replay(args, resp);
 972                         else
 973                                 status = op->status;
 974                         goto out;
 975                 }
 976                 if (op->status == nfserr_replay_me) {
 977                         op->replay = &cstate->replay_owner->so_replay;
 978                         nfsd4_encode_replay(resp, op);
 979                         status = op->status = op->replay->rp_status;
 980                 } else {
 981                         nfsd4_encode_operation(resp, op);
 982                         status = op->status;
 983                 }
 984
 985                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
 986                         args->ops, args->opcnt, resp->opcnt, op->opnum,
 987                         be32_to_cpu(status));
 988
 989                 if (cstate->replay_owner) {
 990                         nfs4_put_stateowner(cstate->replay_owner);
 991                         cstate->replay_owner = NULL;
 992                 }
 993                 /* XXX Ugh, we need to get rid of this kind of special case: */
 994                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 995                         fput(op->u.read.rd_filp);
 996
 997                 nfsd4_increment_op_stats(op->opnum);
 998         }
 999         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1000                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1001                 status = nfserr_jukebox;
1002         }
1003
1004         resp->cstate.status = status;
1005         fh_put(&resp->cstate.current_fh);
1006         fh_put(&resp->cstate.save_fh);
1007         BUG_ON(resp->cstate.replay_owner);
1008 out:
1009         nfsd4_release_compoundargs(args);
1010         /* Reset deferral mechanism for RPC deferrals */
1011         rqstp->rq_usedeferral = 1;
1012         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1013         return status;
1014 }
1015
1016 static struct nfsd4_operation nfsd4_ops[] = {
1017         [OP_ACCESS] = {
1018                 .op_func = (nfsd4op_func)nfsd4_access,
1019                 .op_name = "OP_ACCESS",
1020         },
1021         [OP_CLOSE] = {
1022                 .op_func = (nfsd4op_func)nfsd4_close,
1023                 .op_name = "OP_CLOSE",
1024         },
1025         [OP_COMMIT] = {
1026                 .op_func = (nfsd4op_func)nfsd4_commit,
1027                 .op_name = "OP_COMMIT",
1028         },
1029         [OP_CREATE] = {
1030                 .op_func = (nfsd4op_func)nfsd4_create,
1031                 .op_name = "OP_CREATE",
1032         },
1033         [OP_DELEGRETURN] = {
1034                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1035                 .op_name = "OP_DELEGRETURN",
1036         },
1037         [OP_GETATTR] = {
1038                 .op_func = (nfsd4op_func)nfsd4_getattr,
1039                 .op_flags = ALLOWED_ON_ABSENT_FS,
1040                 .op_name = "OP_GETATTR",
1041         },
1042         [OP_GETFH] = {
1043                 .op_func = (nfsd4op_func)nfsd4_getfh,
1044                 .op_name = "OP_GETFH",
1045         },
1046         [OP_LINK] = {
1047                 .op_func = (nfsd4op_func)nfsd4_link,
1048                 .op_name = "OP_LINK",
1049         },
1050         [OP_LOCK] = {
1051                 .op_func = (nfsd4op_func)nfsd4_lock,
1052                 .op_name = "OP_LOCK",
1053         },
1054         [OP_LOCKT] = {
1055                 .op_func = (nfsd4op_func)nfsd4_lockt,
1056                 .op_name = "OP_LOCKT",
1057         },
1058         [OP_LOCKU] = {
1059                 .op_func = (nfsd4op_func)nfsd4_locku,
1060                 .op_name = "OP_LOCKU",
1061         },
1062         [OP_LOOKUP] = {
1063                 .op_func = (nfsd4op_func)nfsd4_lookup,
1064                 .op_name = "OP_LOOKUP",
1065         },
1066         [OP_LOOKUPP] = {
1067                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1068                 .op_name = "OP_LOOKUPP",
1069         },
1070         [OP_NVERIFY] = {
1071                 .op_func = (nfsd4op_func)nfsd4_nverify,
1072                 .op_name = "OP_NVERIFY",
1073         },
1074         [OP_OPEN] = {
1075                 .op_func = (nfsd4op_func)nfsd4_open,
1076                 .op_name = "OP_OPEN",
1077         },
1078         [OP_OPEN_CONFIRM] = {
1079                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1080                 .op_name = "OP_OPEN_CONFIRM",
1081         },
1082         [OP_OPEN_DOWNGRADE] = {
1083                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1084                 .op_name = "OP_OPEN_DOWNGRADE",
1085         },
1086         [OP_PUTFH] = {
1087                 .op_func = (nfsd4op_func)nfsd4_putfh,
1088                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1089                 .op_name = "OP_PUTFH",
1090         },
1091         [OP_PUTPUBFH] = {
1092                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1093                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1094                 .op_name = "OP_PUTPUBFH",
1095         },
1096         [OP_PUTROOTFH] = {
1097                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1098                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1099                 .op_name = "OP_PUTROOTFH",
1100         },
1101         [OP_READ] = {
1102                 .op_func = (nfsd4op_func)nfsd4_read,
1103                 .op_name = "OP_READ",
1104         },
1105         [OP_READDIR] = {
1106                 .op_func = (nfsd4op_func)nfsd4_readdir,
1107                 .op_name = "OP_READDIR",
1108         },
1109         [OP_READLINK] = {
1110                 .op_func = (nfsd4op_func)nfsd4_readlink,
1111                 .op_name = "OP_READLINK",
1112         },
1113         [OP_REMOVE] = {
1114                 .op_func = (nfsd4op_func)nfsd4_remove,
1115                 .op_name = "OP_REMOVE",
1116         },
1117         [OP_RENAME] = {
1118                 .op_name = "OP_RENAME",
1119                 .op_func = (nfsd4op_func)nfsd4_rename,
1120         },
1121         [OP_RENEW] = {
1122                 .op_func = (nfsd4op_func)nfsd4_renew,
1123                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1124                 .op_name = "OP_RENEW",
1125         },
1126         [OP_RESTOREFH] = {
1127                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1128                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1129                 .op_name = "OP_RESTOREFH",
1130         },
1131         [OP_SAVEFH] = {
1132                 .op_func = (nfsd4op_func)nfsd4_savefh,
1133                 .op_name = "OP_SAVEFH",
1134         },
1135         [OP_SECINFO] = {
1136                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1137                 .op_name = "OP_SECINFO",
1138         },
1139         [OP_SETATTR] = {
1140                 .op_func = (nfsd4op_func)nfsd4_setattr,
1141                 .op_name = "OP_SETATTR",
1142         },
1143         [OP_SETCLIENTID] = {
1144                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1145                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1146                 .op_name = "OP_SETCLIENTID",
1147         },
1148         [OP_SETCLIENTID_CONFIRM] = {
1149                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1150                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1151                 .op_name = "OP_SETCLIENTID_CONFIRM",
1152         },
1153         [OP_VERIFY] = {
1154                 .op_func = (nfsd4op_func)nfsd4_verify,
1155                 .op_name = "OP_VERIFY",
1156         },
1157         [OP_WRITE] = {
1158                 .op_func = (nfsd4op_func)nfsd4_write,
1159                 .op_name = "OP_WRITE",
1160         },
1161         [OP_RELEASE_LOCKOWNER] = {
1162                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1163                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1164                 .op_name = "OP_RELEASE_LOCKOWNER",
1165         },
1166
1167         /* NFSv4.1 operations */
1168         [OP_EXCHANGE_ID] = {
1169                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1170                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1171                 .op_name = "OP_EXCHANGE_ID",
1172         },
1173         [OP_CREATE_SESSION] = {
1174                 .op_func = (nfsd4op_func)nfsd4_create_session,
1175                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1176                 .op_name = "OP_CREATE_SESSION",
1177         },
1178         [OP_DESTROY_SESSION] = {
1179                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1180                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1181                 .op_name = "OP_DESTROY_SESSION",
1182         },
1183         [OP_SEQUENCE] = {
1184                 .op_func = (nfsd4op_func)nfsd4_sequence,
1185                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1186                 .op_name = "OP_SEQUENCE",
1187         },
1188 };
1189
1190 static const char *nfsd4_op_name(unsigned opnum)
1191 {
1192         if (opnum < ARRAY_SIZE(nfsd4_ops))
1193                 return nfsd4_ops[opnum].op_name;
1194         return "unknown_operation";
1195 }
1196
1197 #define nfs4svc_decode_voidargs         NULL
1198 #define nfs4svc_release_void            NULL
1199 #define nfsd4_voidres                   nfsd4_voidargs
1200 #define nfs4svc_release_compound        NULL
1201 struct nfsd4_voidargs { int dummy; };
1202
1203 #define PROC(name, argt, rest, relt, cache, respsize)   \
1204  { (svc_procfunc) nfsd4_proc_##name,            \
1205    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1206    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1207    (kxdrproc_t) nfs4svc_release_##relt,         \
1208    sizeof(struct nfsd4_##argt##args),           \
1209    sizeof(struct nfsd4_##rest##res),            \
1210    0,                                           \
1211    cache,                                       \
1212    respsize,                                    \
1213  }
1214
1215 /*
1216  * TODO: At the present time, the NFSv4 server does not do XID caching
1217  * of requests.  Implementing XID caching would not be a serious problem,
1218  * although it would require a mild change in interfaces since one
1219  * doesn't know whether an NFSv4 request is idempotent until after the
1220  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1221  * Astrand's regression testsuite for NFSv4 servers), which reuses
1222  * XID's liberally, so I've left it unimplemented until pynfs generates
1223  * better XID's.
1224  */
1225 static struct svc_procedure             nfsd_procedures4[2] = {
1226   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1227   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1228 };
1229
1230 struct svc_version      nfsd_version4 = {
1231                 .vs_vers        = 4,
1232                 .vs_nproc       = 2,
1233                 .vs_proc        = nfsd_procedures4,
1234                 .vs_dispatch    = nfsd_dispatch,
1235                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1236 };
1237
1238 /*
1239  * Local variables:
1240  *  c-basic-offset: 8
1241  * End:
1242  */