git.oblomov.eu Git - linux-2.6/blob - fs/nfsd/nfs4proc.c

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