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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 static void
 166 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 167 {
 168         struct nfsd4_sessionid *sid =
 169                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 170
 171         clid->cl_boot = sid->clientid.cl_boot;
 172         clid->cl_id = sid->clientid.cl_id;
 173 }
 174
 175 static __be32
 176 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 177            struct nfsd4_open *open)
 178 {
 179         __be32 status;
 180         struct nfsd4_compoundres *resp;
 181
 182         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 183                 (int)open->op_fname.len, open->op_fname.data,
 184                 open->op_stateowner);
 185
 186         /* This check required by spec. */
 187         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 188                 return nfserr_inval;
 189
 190         if (nfsd4_has_session(cstate))
 191                 copy_clientid(&open->op_clientid, cstate->session);
 192
 193         nfs4_lock_state();
 194
 195         /* check seqid for replay. set nfs4_owner */
 196         resp = rqstp->rq_resp;
 197         status = nfsd4_process_open1(&resp->cstate, open);
 198         if (status == nfserr_replay_me) {
 199                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 200                 fh_put(&cstate->current_fh);
 201                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 202                                 &rp->rp_openfh);
 203                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 204                 if (status)
 205                         dprintk("nfsd4_open: replay failed"
 206                                 " restoring previous filehandle\n");
 207                 else
 208                         status = nfserr_replay_me;
 209         }
 210         if (status)
 211                 goto out;
 212
 213         /* Openowner is now set, so sequence id will get bumped.  Now we need
 214          * these checks before we do any creates: */
 215         status = nfserr_grace;
 216         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 217                 goto out;
 218         status = nfserr_no_grace;
 219         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 220                 goto out;
 221
 222         switch (open->op_claim_type) {
 223                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 224                 case NFS4_OPEN_CLAIM_NULL:
 225                         /*
 226                          * (1) set CURRENT_FH to the file being opened,
 227                          * creating it if necessary, (2) set open->op_cinfo,
 228                          * (3) set open->op_truncate if the file is to be
 229                          * truncated after opening, (4) do permission checking.
 230                          */
 231                         status = do_open_lookup(rqstp, &cstate->current_fh,
 232                                                 open);
 233                         if (status)
 234                                 goto out;
 235                         break;
 236                 case NFS4_OPEN_CLAIM_PREVIOUS:
 237                         open->op_stateowner->so_confirmed = 1;
 238                         /*
 239                          * The CURRENT_FH is already set to the file being
 240                          * opened.  (1) set open->op_cinfo, (2) set
 241                          * open->op_truncate if the file is to be truncated
 242                          * after opening, (3) do permission checking.
 243                         */
 244                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 245                                                  open);
 246                         if (status)
 247                                 goto out;
 248                         break;
 249                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 250                         open->op_stateowner->so_confirmed = 1;
 251                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 252                                 open->op_claim_type);
 253                         status = nfserr_notsupp;
 254                         goto out;
 255                 default:
 256                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 257                                 open->op_claim_type);
 258                         status = nfserr_inval;
 259                         goto out;
 260         }
 261         /*
 262          * nfsd4_process_open2() does the actual opening of the file.  If
 263          * successful, it (1) truncates the file if open->op_truncate was
 264          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 265          */
 266         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 267 out:
 268         if (open->op_stateowner) {
 269                 nfs4_get_stateowner(open->op_stateowner);
 270                 cstate->replay_owner = open->op_stateowner;
 271         }
 272         nfs4_unlock_state();
 273         return status;
 274 }
 275
 276 /*
 277  * filehandle-manipulating ops.
 278  */
 279 static __be32
 280 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 281             struct svc_fh **getfh)
 282 {
 283         if (!cstate->current_fh.fh_dentry)
 284                 return nfserr_nofilehandle;
 285
 286         *getfh = &cstate->current_fh;
 287         return nfs_ok;
 288 }
 289
 290 static __be32
 291 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 292             struct nfsd4_putfh *putfh)
 293 {
 294         fh_put(&cstate->current_fh);
 295         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 296         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 297                putfh->pf_fhlen);
 298         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 299 }
 300
 301 static __be32
 302 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 303                 void *arg)
 304 {
 305         __be32 status;
 306
 307         fh_put(&cstate->current_fh);
 308         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 309         return status;
 310 }
 311
 312 static __be32
 313 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 314                 void *arg)
 315 {
 316         if (!cstate->save_fh.fh_dentry)
 317                 return nfserr_restorefh;
 318
 319         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 320         return nfs_ok;
 321 }
 322
 323 static __be32
 324 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 325              void *arg)
 326 {
 327         if (!cstate->current_fh.fh_dentry)
 328                 return nfserr_nofilehandle;
 329
 330         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 331         return nfs_ok;
 332 }
 333
 334 /*
 335  * misc nfsv4 ops
 336  */
 337 static __be32
 338 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 339              struct nfsd4_access *access)
 340 {
 341         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 342                 return nfserr_inval;
 343
 344         access->ac_resp_access = access->ac_req_access;
 345         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 346                            &access->ac_supported);
 347 }
 348
 349 static __be32
 350 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 351              struct nfsd4_commit *commit)
 352 {
 353         __be32 status;
 354
 355         u32 *p = (u32 *)commit->co_verf.data;
 356         *p++ = nfssvc_boot.tv_sec;
 357         *p++ = nfssvc_boot.tv_usec;
 358
 359         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 360                              commit->co_count);
 361         if (status == nfserr_symlink)
 362                 status = nfserr_inval;
 363         return status;
 364 }
 365
 366 static __be32
 367 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 368              struct nfsd4_create *create)
 369 {
 370         struct svc_fh resfh;
 371         __be32 status;
 372         dev_t rdev;
 373
 374         fh_init(&resfh, NFS4_FHSIZE);
 375
 376         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 377                            NFSD_MAY_CREATE);
 378         if (status == nfserr_symlink)
 379                 status = nfserr_notdir;
 380         if (status)
 381                 return status;
 382
 383         switch (create->cr_type) {
 384         case NF4LNK:
 385                 /* ugh! we have to null-terminate the linktext, or
 386                  * vfs_symlink() will choke.  it is always safe to
 387                  * null-terminate by brute force, since at worst we
 388                  * will overwrite the first byte of the create namelen
 389                  * in the XDR buffer, which has already been extracted
 390                  * during XDR decode.
 391                  */
 392                 create->cr_linkname[create->cr_linklen] = 0;
 393
 394                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 395                                       create->cr_name, create->cr_namelen,
 396                                       create->cr_linkname, create->cr_linklen,
 397                                       &resfh, &create->cr_iattr);
 398                 break;
 399
 400         case NF4BLK:
 401                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 402                 if (MAJOR(rdev) != create->cr_specdata1 ||
 403                     MINOR(rdev) != create->cr_specdata2)
 404                         return nfserr_inval;
 405                 status = nfsd_create(rqstp, &cstate->current_fh,
 406                                      create->cr_name, create->cr_namelen,
 407                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 408                 break;
 409
 410         case NF4CHR:
 411                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 412                 if (MAJOR(rdev) != create->cr_specdata1 ||
 413                     MINOR(rdev) != create->cr_specdata2)
 414                         return nfserr_inval;
 415                 status = nfsd_create(rqstp, &cstate->current_fh,
 416                                      create->cr_name, create->cr_namelen,
 417                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 418                 break;
 419
 420         case NF4SOCK:
 421                 status = nfsd_create(rqstp, &cstate->current_fh,
 422                                      create->cr_name, create->cr_namelen,
 423                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 424                 break;
 425
 426         case NF4FIFO:
 427                 status = nfsd_create(rqstp, &cstate->current_fh,
 428                                      create->cr_name, create->cr_namelen,
 429                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 430                 break;
 431
 432         case NF4DIR:
 433                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 434                 status = nfsd_create(rqstp, &cstate->current_fh,
 435                                      create->cr_name, create->cr_namelen,
 436                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 437                 break;
 438
 439         default:
 440                 status = nfserr_badtype;
 441         }
 442
 443         if (!status) {
 444                 fh_unlock(&cstate->current_fh);
 445                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
 446                 fh_dup2(&cstate->current_fh, &resfh);
 447         }
 448
 449         fh_put(&resfh);
 450         return status;
 451 }
 452
 453 static __be32
 454 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 455               struct nfsd4_getattr *getattr)
 456 {
 457         __be32 status;
 458
 459         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 460         if (status)
 461                 return status;
 462
 463         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 464                 return nfserr_inval;
 465
 466         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 467         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 468
 469         getattr->ga_fhp = &cstate->current_fh;
 470         return nfs_ok;
 471 }
 472
 473 static __be32
 474 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 475            struct nfsd4_link *link)
 476 {
 477         __be32 status = nfserr_nofilehandle;
 478
 479         if (!cstate->save_fh.fh_dentry)
 480                 return status;
 481         status = nfsd_link(rqstp, &cstate->current_fh,
 482                            link->li_name, link->li_namelen, &cstate->save_fh);
 483         if (!status)
 484                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 485         return status;
 486 }
 487
 488 static __be32
 489 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 490               void *arg)
 491 {
 492         struct svc_fh tmp_fh;
 493         __be32 ret;
 494
 495         fh_init(&tmp_fh, NFS4_FHSIZE);
 496         ret = exp_pseudoroot(rqstp, &tmp_fh);
 497         if (ret)
 498                 return ret;
 499         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 500                 fh_put(&tmp_fh);
 501                 return nfserr_noent;
 502         }
 503         fh_put(&tmp_fh);
 504         return nfsd_lookup(rqstp, &cstate->current_fh,
 505                            "..", 2, &cstate->current_fh);
 506 }
 507
 508 static __be32
 509 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510              struct nfsd4_lookup *lookup)
 511 {
 512         return nfsd_lookup(rqstp, &cstate->current_fh,
 513                            lookup->lo_name, lookup->lo_len,
 514                            &cstate->current_fh);
 515 }
 516
 517 static __be32
 518 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 519            struct nfsd4_read *read)
 520 {
 521         __be32 status;
 522
 523         /* no need to check permission - this will be done in nfsd_read() */
 524
 525         read->rd_filp = NULL;
 526         if (read->rd_offset >= OFFSET_MAX)
 527                 return nfserr_inval;
 528
 529         nfs4_lock_state();
 530         /* check stateid */
 531         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 532                                                  RD_STATE, &read->rd_filp))) {
 533                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 534                 goto out;
 535         }
 536         if (read->rd_filp)
 537                 get_file(read->rd_filp);
 538         status = nfs_ok;
 539 out:
 540         nfs4_unlock_state();
 541         read->rd_rqstp = rqstp;
 542         read->rd_fhp = &cstate->current_fh;
 543         return status;
 544 }
 545
 546 static __be32
 547 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 548               struct nfsd4_readdir *readdir)
 549 {
 550         u64 cookie = readdir->rd_cookie;
 551         static const nfs4_verifier zeroverf;
 552
 553         /* no need to check permission - this will be done in nfsd_readdir() */
 554
 555         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 556                 return nfserr_inval;
 557
 558         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 559         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 560
 561         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 562             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 563                 return nfserr_bad_cookie;
 564
 565         readdir->rd_rqstp = rqstp;
 566         readdir->rd_fhp = &cstate->current_fh;
 567         return nfs_ok;
 568 }
 569
 570 static __be32
 571 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 572                struct nfsd4_readlink *readlink)
 573 {
 574         readlink->rl_rqstp = rqstp;
 575         readlink->rl_fhp = &cstate->current_fh;
 576         return nfs_ok;
 577 }
 578
 579 static __be32
 580 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 581              struct nfsd4_remove *remove)
 582 {
 583         __be32 status;
 584
 585         if (locks_in_grace())
 586                 return nfserr_grace;
 587         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 588                              remove->rm_name, remove->rm_namelen);
 589         if (status == nfserr_symlink)
 590                 return nfserr_notdir;
 591         if (!status) {
 592                 fh_unlock(&cstate->current_fh);
 593                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 594         }
 595         return status;
 596 }
 597
 598 static __be32
 599 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_rename *rename)
 601 {
 602         __be32 status = nfserr_nofilehandle;
 603
 604         if (!cstate->save_fh.fh_dentry)
 605                 return status;
 606         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 607                                         & NFSEXP_NOSUBTREECHECK))
 608                 return nfserr_grace;
 609         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 610                              rename->rn_snamelen, &cstate->current_fh,
 611                              rename->rn_tname, rename->rn_tnamelen);
 612
 613         /* the underlying filesystem returns different error's than required
 614          * by NFSv4. both save_fh and current_fh have been verified.. */
 615         if (status == nfserr_isdir)
 616                 status = nfserr_exist;
 617         else if ((status == nfserr_notdir) &&
 618                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 619                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 620                 status = nfserr_exist;
 621         else if (status == nfserr_symlink)
 622                 status = nfserr_notdir;
 623
 624         if (!status) {
 625                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 626                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 627         }
 628         return status;
 629 }
 630
 631 static __be32
 632 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 633               struct nfsd4_secinfo *secinfo)
 634 {
 635         struct svc_fh resfh;
 636         struct svc_export *exp;
 637         struct dentry *dentry;
 638         __be32 err;
 639
 640         fh_init(&resfh, NFS4_FHSIZE);
 641         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 642                                     secinfo->si_name, secinfo->si_namelen,
 643                                     &exp, &dentry);
 644         if (err)
 645                 return err;
 646         if (dentry->d_inode == NULL) {
 647                 exp_put(exp);
 648                 err = nfserr_noent;
 649         } else
 650                 secinfo->si_exp = exp;
 651         dput(dentry);
 652         return err;
 653 }
 654
 655 static __be32
 656 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 657               struct nfsd4_setattr *setattr)
 658 {
 659         __be32 status = nfs_ok;
 660
 661         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 662                 nfs4_lock_state();
 663                 status = nfs4_preprocess_stateid_op(cstate,
 664                         &setattr->sa_stateid, WR_STATE, NULL);
 665                 nfs4_unlock_state();
 666                 if (status) {
 667                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 668                         return status;
 669                 }
 670         }
 671         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 672         if (status)
 673                 return status;
 674         status = nfs_ok;
 675         if (setattr->sa_acl != NULL)
 676                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 677                                             setattr->sa_acl);
 678         if (status)
 679                 goto out;
 680         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 681                                 0, (time_t)0);
 682 out:
 683         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 684         return status;
 685 }
 686
 687 static __be32
 688 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 689             struct nfsd4_write *write)
 690 {
 691         stateid_t *stateid = &write->wr_stateid;
 692         struct file *filp = NULL;
 693         u32 *p;
 694         __be32 status = nfs_ok;
 695         unsigned long cnt;
 696
 697         /* no need to check permission - this will be done in nfsd_write() */
 698
 699         if (write->wr_offset >= OFFSET_MAX)
 700                 return nfserr_inval;
 701
 702         nfs4_lock_state();
 703         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 704         if (filp)
 705                 get_file(filp);
 706         nfs4_unlock_state();
 707
 708         if (status) {
 709                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 710                 return status;
 711         }
 712
 713         cnt = write->wr_buflen;
 714         write->wr_how_written = write->wr_stable_how;
 715         p = (u32 *)write->wr_verifier.data;
 716         *p++ = nfssvc_boot.tv_sec;
 717         *p++ = nfssvc_boot.tv_usec;
 718
 719         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 720                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 721                              &cnt, &write->wr_how_written);
 722         if (filp)
 723                 fput(filp);
 724
 725         write->wr_bytes_written = cnt;
 726
 727         if (status == nfserr_symlink)
 728                 status = nfserr_inval;
 729         return status;
 730 }
 731
 732 /* This routine never returns NFS_OK!  If there are no other errors, it
 733  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 734  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 735  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 736  */
 737 static __be32
 738 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 739              struct nfsd4_verify *verify)
 740 {
 741         __be32 *buf, *p;
 742         int count;
 743         __be32 status;
 744
 745         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 746         if (status)
 747                 return status;
 748
 749         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 750             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 751                 return nfserr_attrnotsupp;
 752         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 753             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 754                 return nfserr_inval;
 755         if (verify->ve_attrlen & 3)
 756                 return nfserr_inval;
 757
 758         /* count in words:
 759          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 760          */
 761         count = 4 + (verify->ve_attrlen >> 2);
 762         buf = kmalloc(count << 2, GFP_KERNEL);
 763         if (!buf)
 764                 return nfserr_resource;
 765
 766         status = nfsd4_encode_fattr(&cstate->current_fh,
 767                                     cstate->current_fh.fh_export,
 768                                     cstate->current_fh.fh_dentry, buf,
 769                                     &count, verify->ve_bmval,
 770                                     rqstp, 0);
 771
 772         /* this means that nfsd4_encode_fattr() ran out of space */
 773         if (status == nfserr_resource && count == 0)
 774                 status = nfserr_not_same;
 775         if (status)
 776                 goto out_kfree;
 777
 778         /* skip bitmap */
 779         p = buf + 1 + ntohl(buf[0]);
 780         status = nfserr_not_same;
 781         if (ntohl(*p++) != verify->ve_attrlen)
 782                 goto out_kfree;
 783         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 784                 status = nfserr_same;
 785
 786 out_kfree:
 787         kfree(buf);
 788         return status;
 789 }
 790
 791 static __be32
 792 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 793               struct nfsd4_verify *verify)
 794 {
 795         __be32 status;
 796
 797         status = _nfsd4_verify(rqstp, cstate, verify);
 798         return status == nfserr_not_same ? nfs_ok : status;
 799 }
 800
 801 static __be32
 802 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 803              struct nfsd4_verify *verify)
 804 {
 805         __be32 status;
 806
 807         status = _nfsd4_verify(rqstp, cstate, verify);
 808         return status == nfserr_same ? nfs_ok : status;
 809 }
 810
 811 /*
 812  * NULL call.
 813  */
 814 static __be32
 815 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 816 {
 817         return nfs_ok;
 818 }
 819
 820 static inline void nfsd4_increment_op_stats(u32 opnum)
 821 {
 822         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 823                 nfsdstats.nfs4_opcount[opnum]++;
 824 }
 825
 826 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 827                               void *);
 828 enum nfsd4_op_flags {
 829         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 830         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
 831         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
 832 };
 833
 834 struct nfsd4_operation {
 835         nfsd4op_func op_func;
 836         u32 op_flags;
 837         char *op_name;
 838 };
 839
 840 static struct nfsd4_operation nfsd4_ops[];
 841
 842 static const char *nfsd4_op_name(unsigned opnum);
 843
 844 /*
 845  * This is a replay of a compound for which no cache entry pages
 846  * were used. Encode the sequence operation, and if cachethis is FALSE
 847  * encode the uncache rep error on the next operation.
 848  */
 849 static __be32
 850 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
 851                          struct nfsd4_compoundres *resp)
 852 {
 853         struct nfsd4_op *op;
 854
 855         dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
 856                 resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
 857
 858         /* Encode the replayed sequence operation */
 859         BUG_ON(resp->opcnt != 1);
 860         op = &args->ops[resp->opcnt - 1];
 861         nfsd4_encode_operation(resp, op);
 862
 863         /*return nfserr_retry_uncached_rep in next operation. */
 864         if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
 865                 op = &args->ops[resp->opcnt++];
 866                 op->status = nfserr_retry_uncached_rep;
 867                 nfsd4_encode_operation(resp, op);
 868         }
 869         return op->status;
 870 }
 871
 872 /*
 873  * Enforce NFSv4.1 COMPOUND ordering rules.
 874  *
 875  * TODO:
 876  * - enforce NFS4ERR_NOT_ONLY_OP,
 877  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
 878  */
 879 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
 880 {
 881         if (args->minorversion && args->opcnt > 0) {
 882                 struct nfsd4_op *op = &args->ops[0];
 883                 return (op->status == nfserr_op_illegal) ||
 884                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
 885         }
 886         return true;
 887 }
 888
 889 /*
 890  * COMPOUND call.
 891  */
 892 static __be32
 893 nfsd4_proc_compound(struct svc_rqst *rqstp,
 894                     struct nfsd4_compoundargs *args,
 895                     struct nfsd4_compoundres *resp)
 896 {
 897         struct nfsd4_op *op;
 898         struct nfsd4_operation *opdesc;
 899         struct nfsd4_compound_state *cstate = &resp->cstate;
 900         int             slack_bytes;
 901         __be32          status;
 902
 903         resp->xbuf = &rqstp->rq_res;
 904         resp->p = rqstp->rq_res.head[0].iov_base +
 905                                                 rqstp->rq_res.head[0].iov_len;
 906         resp->tagp = resp->p;
 907         /* reserve space for: taglen, tag, and opcnt */
 908         resp->p += 2 + XDR_QUADLEN(args->taglen);
 909         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 910         resp->taglen = args->taglen;
 911         resp->tag = args->tag;
 912         resp->opcnt = 0;
 913         resp->rqstp = rqstp;
 914         resp->cstate.minorversion = args->minorversion;
 915         resp->cstate.replay_owner = NULL;
 916         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
 917         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
 918         /* Use the deferral mechanism only for NFSv4.0 compounds */
 919         rqstp->rq_usedeferral = (args->minorversion == 0);
 920
 921         /*
 922          * According to RFC3010, this takes precedence over all other errors.
 923          */
 924         status = nfserr_minor_vers_mismatch;
 925         if (args->minorversion > nfsd_supported_minorversion)
 926                 goto out;
 927
 928         if (!nfs41_op_ordering_ok(args)) {
 929                 op = &args->ops[0];
 930                 op->status = nfserr_sequence_pos;
 931                 goto encode_op;
 932         }
 933
 934         status = nfs_ok;
 935         while (!status && resp->opcnt < args->opcnt) {
 936                 op = &args->ops[resp->opcnt++];
 937
 938                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
 939                         resp->opcnt, args->opcnt, op->opnum,
 940                         nfsd4_op_name(op->opnum));
 941                 /*
 942                  * The XDR decode routines may have pre-set op->status;
 943                  * for example, if there is a miscellaneous XDR error
 944                  * it will be set to nfserr_bad_xdr.
 945                  */
 946                 if (op->status)
 947                         goto encode_op;
 948
 949                 /* We must be able to encode a successful response to
 950                  * this operation, with enough room left over to encode a
 951                  * failed response to the next operation.  If we don't
 952                  * have enough room, fail with ERR_RESOURCE.
 953                  */
 954                 slack_bytes = (char *)resp->end - (char *)resp->p;
 955                 if (slack_bytes < COMPOUND_SLACK_SPACE
 956                                 + COMPOUND_ERR_SLACK_SPACE) {
 957                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 958                         op->status = nfserr_resource;
 959                         goto encode_op;
 960                 }
 961
 962                 opdesc = &nfsd4_ops[op->opnum];
 963
 964                 if (!cstate->current_fh.fh_dentry) {
 965                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 966                                 op->status = nfserr_nofilehandle;
 967                                 goto encode_op;
 968                         }
 969                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 970                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 971                         op->status = nfserr_moved;
 972                         goto encode_op;
 973                 }
 974
 975                 if (opdesc->op_func)
 976                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 977                 else
 978                         BUG_ON(op->status == nfs_ok);
 979
 980 encode_op:
 981                 /* Only from SEQUENCE or CREATE_SESSION */
 982                 if (resp->cstate.status == nfserr_replay_cache) {
 983                         dprintk("%s NFS4.1 replay from cache\n", __func__);
 984                         if (nfsd4_not_cached(resp))
 985                                 status = nfsd4_enc_uncached_replay(args, resp);
 986                         else
 987                                 status = op->status;
 988                         goto out;
 989                 }
 990                 if (op->status == nfserr_replay_me) {
 991                         op->replay = &cstate->replay_owner->so_replay;
 992                         nfsd4_encode_replay(resp, op);
 993                         status = op->status = op->replay->rp_status;
 994                 } else {
 995                         nfsd4_encode_operation(resp, op);
 996                         status = op->status;
 997                 }
 998
 999                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1000                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1001                         be32_to_cpu(status));
1002
1003                 if (cstate->replay_owner) {
1004                         nfs4_put_stateowner(cstate->replay_owner);
1005                         cstate->replay_owner = NULL;
1006                 }
1007                 /* XXX Ugh, we need to get rid of this kind of special case: */
1008                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1009                         fput(op->u.read.rd_filp);
1010
1011                 nfsd4_increment_op_stats(op->opnum);
1012         }
1013         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1014                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1015                 status = nfserr_jukebox;
1016         }
1017
1018         resp->cstate.status = status;
1019         fh_put(&resp->cstate.current_fh);
1020         fh_put(&resp->cstate.save_fh);
1021         BUG_ON(resp->cstate.replay_owner);
1022 out:
1023         nfsd4_release_compoundargs(args);
1024         /* Reset deferral mechanism for RPC deferrals */
1025         rqstp->rq_usedeferral = 1;
1026         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1027         return status;
1028 }
1029
1030 static struct nfsd4_operation nfsd4_ops[] = {
1031         [OP_ACCESS] = {
1032                 .op_func = (nfsd4op_func)nfsd4_access,
1033                 .op_name = "OP_ACCESS",
1034         },
1035         [OP_CLOSE] = {
1036                 .op_func = (nfsd4op_func)nfsd4_close,
1037                 .op_name = "OP_CLOSE",
1038         },
1039         [OP_COMMIT] = {
1040                 .op_func = (nfsd4op_func)nfsd4_commit,
1041                 .op_name = "OP_COMMIT",
1042         },
1043         [OP_CREATE] = {
1044                 .op_func = (nfsd4op_func)nfsd4_create,
1045                 .op_name = "OP_CREATE",
1046         },
1047         [OP_DELEGRETURN] = {
1048                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1049                 .op_name = "OP_DELEGRETURN",
1050         },
1051         [OP_GETATTR] = {
1052                 .op_func = (nfsd4op_func)nfsd4_getattr,
1053                 .op_flags = ALLOWED_ON_ABSENT_FS,
1054                 .op_name = "OP_GETATTR",
1055         },
1056         [OP_GETFH] = {
1057                 .op_func = (nfsd4op_func)nfsd4_getfh,
1058                 .op_name = "OP_GETFH",
1059         },
1060         [OP_LINK] = {
1061                 .op_func = (nfsd4op_func)nfsd4_link,
1062                 .op_name = "OP_LINK",
1063         },
1064         [OP_LOCK] = {
1065                 .op_func = (nfsd4op_func)nfsd4_lock,
1066                 .op_name = "OP_LOCK",
1067         },
1068         [OP_LOCKT] = {
1069                 .op_func = (nfsd4op_func)nfsd4_lockt,
1070                 .op_name = "OP_LOCKT",
1071         },
1072         [OP_LOCKU] = {
1073                 .op_func = (nfsd4op_func)nfsd4_locku,
1074                 .op_name = "OP_LOCKU",
1075         },
1076         [OP_LOOKUP] = {
1077                 .op_func = (nfsd4op_func)nfsd4_lookup,
1078                 .op_name = "OP_LOOKUP",
1079         },
1080         [OP_LOOKUPP] = {
1081                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1082                 .op_name = "OP_LOOKUPP",
1083         },
1084         [OP_NVERIFY] = {
1085                 .op_func = (nfsd4op_func)nfsd4_nverify,
1086                 .op_name = "OP_NVERIFY",
1087         },
1088         [OP_OPEN] = {
1089                 .op_func = (nfsd4op_func)nfsd4_open,
1090                 .op_name = "OP_OPEN",
1091         },
1092         [OP_OPEN_CONFIRM] = {
1093                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1094                 .op_name = "OP_OPEN_CONFIRM",
1095         },
1096         [OP_OPEN_DOWNGRADE] = {
1097                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1098                 .op_name = "OP_OPEN_DOWNGRADE",
1099         },
1100         [OP_PUTFH] = {
1101                 .op_func = (nfsd4op_func)nfsd4_putfh,
1102                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1103                 .op_name = "OP_PUTFH",
1104         },
1105         [OP_PUTPUBFH] = {
1106                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1107                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1108                 .op_name = "OP_PUTPUBFH",
1109         },
1110         [OP_PUTROOTFH] = {
1111                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1112                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1113                 .op_name = "OP_PUTROOTFH",
1114         },
1115         [OP_READ] = {
1116                 .op_func = (nfsd4op_func)nfsd4_read,
1117                 .op_name = "OP_READ",
1118         },
1119         [OP_READDIR] = {
1120                 .op_func = (nfsd4op_func)nfsd4_readdir,
1121                 .op_name = "OP_READDIR",
1122         },
1123         [OP_READLINK] = {
1124                 .op_func = (nfsd4op_func)nfsd4_readlink,
1125                 .op_name = "OP_READLINK",
1126         },
1127         [OP_REMOVE] = {
1128                 .op_func = (nfsd4op_func)nfsd4_remove,
1129                 .op_name = "OP_REMOVE",
1130         },
1131         [OP_RENAME] = {
1132                 .op_name = "OP_RENAME",
1133                 .op_func = (nfsd4op_func)nfsd4_rename,
1134         },
1135         [OP_RENEW] = {
1136                 .op_func = (nfsd4op_func)nfsd4_renew,
1137                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1138                 .op_name = "OP_RENEW",
1139         },
1140         [OP_RESTOREFH] = {
1141                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1142                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1143                 .op_name = "OP_RESTOREFH",
1144         },
1145         [OP_SAVEFH] = {
1146                 .op_func = (nfsd4op_func)nfsd4_savefh,
1147                 .op_name = "OP_SAVEFH",
1148         },
1149         [OP_SECINFO] = {
1150                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1151                 .op_name = "OP_SECINFO",
1152         },
1153         [OP_SETATTR] = {
1154                 .op_func = (nfsd4op_func)nfsd4_setattr,
1155                 .op_name = "OP_SETATTR",
1156         },
1157         [OP_SETCLIENTID] = {
1158                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1159                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1160                 .op_name = "OP_SETCLIENTID",
1161         },
1162         [OP_SETCLIENTID_CONFIRM] = {
1163                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1164                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1165                 .op_name = "OP_SETCLIENTID_CONFIRM",
1166         },
1167         [OP_VERIFY] = {
1168                 .op_func = (nfsd4op_func)nfsd4_verify,
1169                 .op_name = "OP_VERIFY",
1170         },
1171         [OP_WRITE] = {
1172                 .op_func = (nfsd4op_func)nfsd4_write,
1173                 .op_name = "OP_WRITE",
1174         },
1175         [OP_RELEASE_LOCKOWNER] = {
1176                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1177                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1178                 .op_name = "OP_RELEASE_LOCKOWNER",
1179         },
1180
1181         /* NFSv4.1 operations */
1182         [OP_EXCHANGE_ID] = {
1183                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1184                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1185                 .op_name = "OP_EXCHANGE_ID",
1186         },
1187         [OP_CREATE_SESSION] = {
1188                 .op_func = (nfsd4op_func)nfsd4_create_session,
1189                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1190                 .op_name = "OP_CREATE_SESSION",
1191         },
1192         [OP_DESTROY_SESSION] = {
1193                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1194                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1195                 .op_name = "OP_DESTROY_SESSION",
1196         },
1197         [OP_SEQUENCE] = {
1198                 .op_func = (nfsd4op_func)nfsd4_sequence,
1199                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1200                 .op_name = "OP_SEQUENCE",
1201         },
1202 };
1203
1204 static const char *nfsd4_op_name(unsigned opnum)
1205 {
1206         if (opnum < ARRAY_SIZE(nfsd4_ops))
1207                 return nfsd4_ops[opnum].op_name;
1208         return "unknown_operation";
1209 }
1210
1211 #define nfs4svc_decode_voidargs         NULL
1212 #define nfs4svc_release_void            NULL
1213 #define nfsd4_voidres                   nfsd4_voidargs
1214 #define nfs4svc_release_compound        NULL
1215 struct nfsd4_voidargs { int dummy; };
1216
1217 #define PROC(name, argt, rest, relt, cache, respsize)   \
1218  { (svc_procfunc) nfsd4_proc_##name,            \
1219    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1220    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1221    (kxdrproc_t) nfs4svc_release_##relt,         \
1222    sizeof(struct nfsd4_##argt##args),           \
1223    sizeof(struct nfsd4_##rest##res),            \
1224    0,                                           \
1225    cache,                                       \
1226    respsize,                                    \
1227  }
1228
1229 /*
1230  * TODO: At the present time, the NFSv4 server does not do XID caching
1231  * of requests.  Implementing XID caching would not be a serious problem,
1232  * although it would require a mild change in interfaces since one
1233  * doesn't know whether an NFSv4 request is idempotent until after the
1234  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1235  * Astrand's regression testsuite for NFSv4 servers), which reuses
1236  * XID's liberally, so I've left it unimplemented until pynfs generates
1237  * better XID's.
1238  */
1239 static struct svc_procedure             nfsd_procedures4[2] = {
1240   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1241   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1242 };
1243
1244 struct svc_version      nfsd_version4 = {
1245                 .vs_vers        = 4,
1246                 .vs_nproc       = 2,
1247                 .vs_proc        = nfsd_procedures4,
1248                 .vs_dispatch    = nfsd_dispatch,
1249                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1250 };
1251
1252 /*
1253  * Local variables:
1254  *  c-basic-offset: 8
1255  * End:
1256  */