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                 /* FIXME: check session persistence and pnfs flags.
  97                  * The nfsv4.1 spec requires the following semantics:
  98                  *
  99                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 100                  * Reply Cache  | server |                 |
 101                  * -------------+--------+-----------------+--------------------
 102                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 103                  *              |        |                 | (SHOULD)
 104                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 105                  *              |        |                 | (SHOULD NOT)
 106                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 107                  * yes          | no     | GUARDED4        | GUARDED4
 108                  * yes          | yes    | GUARDED4        | GUARDED4
 109                  */
 110
 111                 /*
 112                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 113                  * in NFSv4 as in v3.
 114                  */
 115                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 116                                         open->op_fname.len, &open->op_iattr,
 117                                         &resfh, open->op_createmode,
 118                                         (u32 *)open->op_verf.data,
 119                                         &open->op_truncate, &created);
 120
 121                 /*
 122                  * Following rfc 3530 14.2.16, use the returned bitmask
 123                  * to indicate which attributes we used to store the
 124                  * verifier:
 125                  */
 126                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 127                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 128                                                 FATTR4_WORD1_TIME_MODIFY);
 129         } else {
 130                 status = nfsd_lookup(rqstp, current_fh,
 131                                      open->op_fname.data, open->op_fname.len, &resfh);
 132                 fh_unlock(current_fh);
 133         }
 134         if (status)
 135                 goto out;
 136
 137         set_change_info(&open->op_cinfo, current_fh);
 138         fh_dup2(current_fh, &resfh);
 139
 140         /* set reply cache */
 141         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 142                         &resfh.fh_handle);
 143         if (!created)
 144                 status = do_open_permission(rqstp, current_fh, open,
 145                                             NFSD_MAY_NOP);
 146
 147 out:
 148         fh_put(&resfh);
 149         return status;
 150 }
 151
 152 static __be32
 153 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 154 {
 155         __be32 status;
 156
 157         /* Only reclaims from previously confirmed clients are valid */
 158         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 159                 return status;
 160
 161         /* We don't know the target directory, and therefore can not
 162         * set the change info
 163         */
 164
 165         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 166
 167         /* set replay cache */
 168         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 169                         &current_fh->fh_handle);
 170
 171         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 172                 (open->op_iattr.ia_size == 0);
 173
 174         status = do_open_permission(rqstp, current_fh, open,
 175                                     NFSD_MAY_OWNER_OVERRIDE);
 176
 177         return status;
 178 }
 179
 180 static void
 181 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 182 {
 183         struct nfsd4_sessionid *sid =
 184                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 185
 186         clid->cl_boot = sid->clientid.cl_boot;
 187         clid->cl_id = sid->clientid.cl_id;
 188 }
 189
 190 static __be32
 191 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 192            struct nfsd4_open *open)
 193 {
 194         __be32 status;
 195         struct nfsd4_compoundres *resp;
 196
 197         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 198                 (int)open->op_fname.len, open->op_fname.data,
 199                 open->op_stateowner);
 200
 201         /* This check required by spec. */
 202         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 203                 return nfserr_inval;
 204
 205         if (nfsd4_has_session(cstate))
 206                 copy_clientid(&open->op_clientid, cstate->session);
 207
 208         nfs4_lock_state();
 209
 210         /* check seqid for replay. set nfs4_owner */
 211         resp = rqstp->rq_resp;
 212         status = nfsd4_process_open1(&resp->cstate, open);
 213         if (status == nfserr_replay_me) {
 214                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 215                 fh_put(&cstate->current_fh);
 216                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 217                                 &rp->rp_openfh);
 218                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 219                 if (status)
 220                         dprintk("nfsd4_open: replay failed"
 221                                 " restoring previous filehandle\n");
 222                 else
 223                         status = nfserr_replay_me;
 224         }
 225         if (status)
 226                 goto out;
 227
 228         /* Openowner is now set, so sequence id will get bumped.  Now we need
 229          * these checks before we do any creates: */
 230         status = nfserr_grace;
 231         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 232                 goto out;
 233         status = nfserr_no_grace;
 234         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 235                 goto out;
 236
 237         switch (open->op_claim_type) {
 238                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 239                 case NFS4_OPEN_CLAIM_NULL:
 240                         /*
 241                          * (1) set CURRENT_FH to the file being opened,
 242                          * creating it if necessary, (2) set open->op_cinfo,
 243                          * (3) set open->op_truncate if the file is to be
 244                          * truncated after opening, (4) do permission checking.
 245                          */
 246                         status = do_open_lookup(rqstp, &cstate->current_fh,
 247                                                 open);
 248                         if (status)
 249                                 goto out;
 250                         break;
 251                 case NFS4_OPEN_CLAIM_PREVIOUS:
 252                         open->op_stateowner->so_confirmed = 1;
 253                         /*
 254                          * The CURRENT_FH is already set to the file being
 255                          * opened.  (1) set open->op_cinfo, (2) set
 256                          * open->op_truncate if the file is to be truncated
 257                          * after opening, (3) do permission checking.
 258                         */
 259                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 260                                                  open);
 261                         if (status)
 262                                 goto out;
 263                         break;
 264                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 265                         open->op_stateowner->so_confirmed = 1;
 266                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 267                                 open->op_claim_type);
 268                         status = nfserr_notsupp;
 269                         goto out;
 270                 default:
 271                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 272                                 open->op_claim_type);
 273                         status = nfserr_inval;
 274                         goto out;
 275         }
 276         /*
 277          * nfsd4_process_open2() does the actual opening of the file.  If
 278          * successful, it (1) truncates the file if open->op_truncate was
 279          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 280          */
 281         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 282 out:
 283         if (open->op_stateowner) {
 284                 nfs4_get_stateowner(open->op_stateowner);
 285                 cstate->replay_owner = open->op_stateowner;
 286         }
 287         nfs4_unlock_state();
 288         return status;
 289 }
 290
 291 /*
 292  * filehandle-manipulating ops.
 293  */
 294 static __be32
 295 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 296             struct svc_fh **getfh)
 297 {
 298         if (!cstate->current_fh.fh_dentry)
 299                 return nfserr_nofilehandle;
 300
 301         *getfh = &cstate->current_fh;
 302         return nfs_ok;
 303 }
 304
 305 static __be32
 306 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 307             struct nfsd4_putfh *putfh)
 308 {
 309         fh_put(&cstate->current_fh);
 310         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 311         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 312                putfh->pf_fhlen);
 313         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 314 }
 315
 316 static __be32
 317 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 318                 void *arg)
 319 {
 320         __be32 status;
 321
 322         fh_put(&cstate->current_fh);
 323         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 324         return status;
 325 }
 326
 327 static __be32
 328 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 329                 void *arg)
 330 {
 331         if (!cstate->save_fh.fh_dentry)
 332                 return nfserr_restorefh;
 333
 334         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 335         return nfs_ok;
 336 }
 337
 338 static __be32
 339 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 340              void *arg)
 341 {
 342         if (!cstate->current_fh.fh_dentry)
 343                 return nfserr_nofilehandle;
 344
 345         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 346         return nfs_ok;
 347 }
 348
 349 /*
 350  * misc nfsv4 ops
 351  */
 352 static __be32
 353 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 354              struct nfsd4_access *access)
 355 {
 356         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 357                 return nfserr_inval;
 358
 359         access->ac_resp_access = access->ac_req_access;
 360         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 361                            &access->ac_supported);
 362 }
 363
 364 static __be32
 365 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 366              struct nfsd4_commit *commit)
 367 {
 368         __be32 status;
 369
 370         u32 *p = (u32 *)commit->co_verf.data;
 371         *p++ = nfssvc_boot.tv_sec;
 372         *p++ = nfssvc_boot.tv_usec;
 373
 374         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 375                              commit->co_count);
 376         if (status == nfserr_symlink)
 377                 status = nfserr_inval;
 378         return status;
 379 }
 380
 381 static __be32
 382 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 383              struct nfsd4_create *create)
 384 {
 385         struct svc_fh resfh;
 386         __be32 status;
 387         dev_t rdev;
 388
 389         fh_init(&resfh, NFS4_FHSIZE);
 390
 391         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 392                            NFSD_MAY_CREATE);
 393         if (status == nfserr_symlink)
 394                 status = nfserr_notdir;
 395         if (status)
 396                 return status;
 397
 398         switch (create->cr_type) {
 399         case NF4LNK:
 400                 /* ugh! we have to null-terminate the linktext, or
 401                  * vfs_symlink() will choke.  it is always safe to
 402                  * null-terminate by brute force, since at worst we
 403                  * will overwrite the first byte of the create namelen
 404                  * in the XDR buffer, which has already been extracted
 405                  * during XDR decode.
 406                  */
 407                 create->cr_linkname[create->cr_linklen] = 0;
 408
 409                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 410                                       create->cr_name, create->cr_namelen,
 411                                       create->cr_linkname, create->cr_linklen,
 412                                       &resfh, &create->cr_iattr);
 413                 break;
 414
 415         case NF4BLK:
 416                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 417                 if (MAJOR(rdev) != create->cr_specdata1 ||
 418                     MINOR(rdev) != create->cr_specdata2)
 419                         return nfserr_inval;
 420                 status = nfsd_create(rqstp, &cstate->current_fh,
 421                                      create->cr_name, create->cr_namelen,
 422                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 423                 break;
 424
 425         case NF4CHR:
 426                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 427                 if (MAJOR(rdev) != create->cr_specdata1 ||
 428                     MINOR(rdev) != create->cr_specdata2)
 429                         return nfserr_inval;
 430                 status = nfsd_create(rqstp, &cstate->current_fh,
 431                                      create->cr_name, create->cr_namelen,
 432                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 433                 break;
 434
 435         case NF4SOCK:
 436                 status = nfsd_create(rqstp, &cstate->current_fh,
 437                                      create->cr_name, create->cr_namelen,
 438                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 439                 break;
 440
 441         case NF4FIFO:
 442                 status = nfsd_create(rqstp, &cstate->current_fh,
 443                                      create->cr_name, create->cr_namelen,
 444                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 445                 break;
 446
 447         case NF4DIR:
 448                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 449                 status = nfsd_create(rqstp, &cstate->current_fh,
 450                                      create->cr_name, create->cr_namelen,
 451                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 452                 break;
 453
 454         default:
 455                 status = nfserr_badtype;
 456         }
 457
 458         if (!status) {
 459                 fh_unlock(&cstate->current_fh);
 460                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
 461                 fh_dup2(&cstate->current_fh, &resfh);
 462         }
 463
 464         fh_put(&resfh);
 465         return status;
 466 }
 467
 468 static __be32
 469 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 470               struct nfsd4_getattr *getattr)
 471 {
 472         __be32 status;
 473
 474         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 475         if (status)
 476                 return status;
 477
 478         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 479                 return nfserr_inval;
 480
 481         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 482         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 483         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 484
 485         getattr->ga_fhp = &cstate->current_fh;
 486         return nfs_ok;
 487 }
 488
 489 static __be32
 490 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 491            struct nfsd4_link *link)
 492 {
 493         __be32 status = nfserr_nofilehandle;
 494
 495         if (!cstate->save_fh.fh_dentry)
 496                 return status;
 497         status = nfsd_link(rqstp, &cstate->current_fh,
 498                            link->li_name, link->li_namelen, &cstate->save_fh);
 499         if (!status)
 500                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 501         return status;
 502 }
 503
 504 static __be32
 505 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 506               void *arg)
 507 {
 508         struct svc_fh tmp_fh;
 509         __be32 ret;
 510
 511         fh_init(&tmp_fh, NFS4_FHSIZE);
 512         ret = exp_pseudoroot(rqstp, &tmp_fh);
 513         if (ret)
 514                 return ret;
 515         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 516                 fh_put(&tmp_fh);
 517                 return nfserr_noent;
 518         }
 519         fh_put(&tmp_fh);
 520         return nfsd_lookup(rqstp, &cstate->current_fh,
 521                            "..", 2, &cstate->current_fh);
 522 }
 523
 524 static __be32
 525 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 526              struct nfsd4_lookup *lookup)
 527 {
 528         return nfsd_lookup(rqstp, &cstate->current_fh,
 529                            lookup->lo_name, lookup->lo_len,
 530                            &cstate->current_fh);
 531 }
 532
 533 static __be32
 534 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 535            struct nfsd4_read *read)
 536 {
 537         __be32 status;
 538
 539         /* no need to check permission - this will be done in nfsd_read() */
 540
 541         read->rd_filp = NULL;
 542         if (read->rd_offset >= OFFSET_MAX)
 543                 return nfserr_inval;
 544
 545         nfs4_lock_state();
 546         /* check stateid */
 547         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 548                                                  RD_STATE, &read->rd_filp))) {
 549                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 550                 goto out;
 551         }
 552         if (read->rd_filp)
 553                 get_file(read->rd_filp);
 554         status = nfs_ok;
 555 out:
 556         nfs4_unlock_state();
 557         read->rd_rqstp = rqstp;
 558         read->rd_fhp = &cstate->current_fh;
 559         return status;
 560 }
 561
 562 static __be32
 563 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 564               struct nfsd4_readdir *readdir)
 565 {
 566         u64 cookie = readdir->rd_cookie;
 567         static const nfs4_verifier zeroverf;
 568
 569         /* no need to check permission - this will be done in nfsd_readdir() */
 570
 571         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 572                 return nfserr_inval;
 573
 574         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 575         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 576         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 577
 578         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 579             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 580                 return nfserr_bad_cookie;
 581
 582         readdir->rd_rqstp = rqstp;
 583         readdir->rd_fhp = &cstate->current_fh;
 584         return nfs_ok;
 585 }
 586
 587 static __be32
 588 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 589                struct nfsd4_readlink *readlink)
 590 {
 591         readlink->rl_rqstp = rqstp;
 592         readlink->rl_fhp = &cstate->current_fh;
 593         return nfs_ok;
 594 }
 595
 596 static __be32
 597 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 598              struct nfsd4_remove *remove)
 599 {
 600         __be32 status;
 601
 602         if (locks_in_grace())
 603                 return nfserr_grace;
 604         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 605                              remove->rm_name, remove->rm_namelen);
 606         if (status == nfserr_symlink)
 607                 return nfserr_notdir;
 608         if (!status) {
 609                 fh_unlock(&cstate->current_fh);
 610                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 611         }
 612         return status;
 613 }
 614
 615 static __be32
 616 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 617              struct nfsd4_rename *rename)
 618 {
 619         __be32 status = nfserr_nofilehandle;
 620
 621         if (!cstate->save_fh.fh_dentry)
 622                 return status;
 623         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 624                                         & NFSEXP_NOSUBTREECHECK))
 625                 return nfserr_grace;
 626         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 627                              rename->rn_snamelen, &cstate->current_fh,
 628                              rename->rn_tname, rename->rn_tnamelen);
 629
 630         /* the underlying filesystem returns different error's than required
 631          * by NFSv4. both save_fh and current_fh have been verified.. */
 632         if (status == nfserr_isdir)
 633                 status = nfserr_exist;
 634         else if ((status == nfserr_notdir) &&
 635                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 636                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 637                 status = nfserr_exist;
 638         else if (status == nfserr_symlink)
 639                 status = nfserr_notdir;
 640
 641         if (!status) {
 642                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 643                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 644         }
 645         return status;
 646 }
 647
 648 static __be32
 649 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 650               struct nfsd4_secinfo *secinfo)
 651 {
 652         struct svc_fh resfh;
 653         struct svc_export *exp;
 654         struct dentry *dentry;
 655         __be32 err;
 656
 657         fh_init(&resfh, NFS4_FHSIZE);
 658         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 659                                     secinfo->si_name, secinfo->si_namelen,
 660                                     &exp, &dentry);
 661         if (err)
 662                 return err;
 663         if (dentry->d_inode == NULL) {
 664                 exp_put(exp);
 665                 err = nfserr_noent;
 666         } else
 667                 secinfo->si_exp = exp;
 668         dput(dentry);
 669         return err;
 670 }
 671
 672 static __be32
 673 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 674               struct nfsd4_setattr *setattr)
 675 {
 676         __be32 status = nfs_ok;
 677
 678         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 679                 nfs4_lock_state();
 680                 status = nfs4_preprocess_stateid_op(cstate,
 681                         &setattr->sa_stateid, WR_STATE, NULL);
 682                 nfs4_unlock_state();
 683                 if (status) {
 684                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 685                         return status;
 686                 }
 687         }
 688         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 689         if (status)
 690                 return status;
 691         status = nfs_ok;
 692         if (setattr->sa_acl != NULL)
 693                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 694                                             setattr->sa_acl);
 695         if (status)
 696                 goto out;
 697         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 698                                 0, (time_t)0);
 699 out:
 700         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 701         return status;
 702 }
 703
 704 static __be32
 705 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 706             struct nfsd4_write *write)
 707 {
 708         stateid_t *stateid = &write->wr_stateid;
 709         struct file *filp = NULL;
 710         u32 *p;
 711         __be32 status = nfs_ok;
 712         unsigned long cnt;
 713
 714         /* no need to check permission - this will be done in nfsd_write() */
 715
 716         if (write->wr_offset >= OFFSET_MAX)
 717                 return nfserr_inval;
 718
 719         nfs4_lock_state();
 720         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 721         if (filp)
 722                 get_file(filp);
 723         nfs4_unlock_state();
 724
 725         if (status) {
 726                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 727                 return status;
 728         }
 729
 730         cnt = write->wr_buflen;
 731         write->wr_how_written = write->wr_stable_how;
 732         p = (u32 *)write->wr_verifier.data;
 733         *p++ = nfssvc_boot.tv_sec;
 734         *p++ = nfssvc_boot.tv_usec;
 735
 736         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 737                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 738                              &cnt, &write->wr_how_written);
 739         if (filp)
 740                 fput(filp);
 741
 742         write->wr_bytes_written = cnt;
 743
 744         if (status == nfserr_symlink)
 745                 status = nfserr_inval;
 746         return status;
 747 }
 748
 749 /* This routine never returns NFS_OK!  If there are no other errors, it
 750  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 751  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 752  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 753  */
 754 static __be32
 755 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 756              struct nfsd4_verify *verify)
 757 {
 758         __be32 *buf, *p;
 759         int count;
 760         __be32 status;
 761
 762         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 763         if (status)
 764                 return status;
 765
 766         if ((verify->ve_bmval[0] & ~nfsd_suppattrs0(cstate->minorversion))
 767             || (verify->ve_bmval[1] & ~nfsd_suppattrs1(cstate->minorversion))
 768             || (verify->ve_bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 769                 return nfserr_attrnotsupp;
 770         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 771             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 772                 return nfserr_inval;
 773         if (verify->ve_attrlen & 3)
 774                 return nfserr_inval;
 775
 776         /* count in words:
 777          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 778          */
 779         count = 4 + (verify->ve_attrlen >> 2);
 780         buf = kmalloc(count << 2, GFP_KERNEL);
 781         if (!buf)
 782                 return nfserr_resource;
 783
 784         status = nfsd4_encode_fattr(&cstate->current_fh,
 785                                     cstate->current_fh.fh_export,
 786                                     cstate->current_fh.fh_dentry, buf,
 787                                     &count, verify->ve_bmval,
 788                                     rqstp, 0);
 789
 790         /* this means that nfsd4_encode_fattr() ran out of space */
 791         if (status == nfserr_resource && count == 0)
 792                 status = nfserr_not_same;
 793         if (status)
 794                 goto out_kfree;
 795
 796         /* skip bitmap */
 797         p = buf + 1 + ntohl(buf[0]);
 798         status = nfserr_not_same;
 799         if (ntohl(*p++) != verify->ve_attrlen)
 800                 goto out_kfree;
 801         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 802                 status = nfserr_same;
 803
 804 out_kfree:
 805         kfree(buf);
 806         return status;
 807 }
 808
 809 static __be32
 810 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 811               struct nfsd4_verify *verify)
 812 {
 813         __be32 status;
 814
 815         status = _nfsd4_verify(rqstp, cstate, verify);
 816         return status == nfserr_not_same ? nfs_ok : status;
 817 }
 818
 819 static __be32
 820 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 821              struct nfsd4_verify *verify)
 822 {
 823         __be32 status;
 824
 825         status = _nfsd4_verify(rqstp, cstate, verify);
 826         return status == nfserr_same ? nfs_ok : status;
 827 }
 828
 829 /*
 830  * NULL call.
 831  */
 832 static __be32
 833 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 834 {
 835         return nfs_ok;
 836 }
 837
 838 static inline void nfsd4_increment_op_stats(u32 opnum)
 839 {
 840         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 841                 nfsdstats.nfs4_opcount[opnum]++;
 842 }
 843
 844 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 845                               void *);
 846 enum nfsd4_op_flags {
 847         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 848         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
 849         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
 850 };
 851
 852 struct nfsd4_operation {
 853         nfsd4op_func op_func;
 854         u32 op_flags;
 855         char *op_name;
 856 };
 857
 858 static struct nfsd4_operation nfsd4_ops[];
 859
 860 static const char *nfsd4_op_name(unsigned opnum);
 861
 862 /*
 863  * This is a replay of a compound for which no cache entry pages
 864  * were used. Encode the sequence operation, and if cachethis is FALSE
 865  * encode the uncache rep error on the next operation.
 866  */
 867 static __be32
 868 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
 869                          struct nfsd4_compoundres *resp)
 870 {
 871         struct nfsd4_op *op;
 872
 873         dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
 874                 resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
 875
 876         /* Encode the replayed sequence operation */
 877         BUG_ON(resp->opcnt != 1);
 878         op = &args->ops[resp->opcnt - 1];
 879         nfsd4_encode_operation(resp, op);
 880
 881         /*return nfserr_retry_uncached_rep in next operation. */
 882         if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
 883                 op = &args->ops[resp->opcnt++];
 884                 op->status = nfserr_retry_uncached_rep;
 885                 nfsd4_encode_operation(resp, op);
 886         }
 887         return op->status;
 888 }
 889
 890 /*
 891  * Enforce NFSv4.1 COMPOUND ordering rules.
 892  *
 893  * TODO:
 894  * - enforce NFS4ERR_NOT_ONLY_OP,
 895  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
 896  */
 897 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
 898 {
 899         if (args->minorversion && args->opcnt > 0) {
 900                 struct nfsd4_op *op = &args->ops[0];
 901                 return (op->status == nfserr_op_illegal) ||
 902                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
 903         }
 904         return true;
 905 }
 906
 907 /*
 908  * COMPOUND call.
 909  */
 910 static __be32
 911 nfsd4_proc_compound(struct svc_rqst *rqstp,
 912                     struct nfsd4_compoundargs *args,
 913                     struct nfsd4_compoundres *resp)
 914 {
 915         struct nfsd4_op *op;
 916         struct nfsd4_operation *opdesc;
 917         struct nfsd4_compound_state *cstate = &resp->cstate;
 918         int             slack_bytes;
 919         __be32          status;
 920
 921         resp->xbuf = &rqstp->rq_res;
 922         resp->p = rqstp->rq_res.head[0].iov_base +
 923                                                 rqstp->rq_res.head[0].iov_len;
 924         resp->tagp = resp->p;
 925         /* reserve space for: taglen, tag, and opcnt */
 926         resp->p += 2 + XDR_QUADLEN(args->taglen);
 927         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 928         resp->taglen = args->taglen;
 929         resp->tag = args->tag;
 930         resp->opcnt = 0;
 931         resp->rqstp = rqstp;
 932         resp->cstate.minorversion = args->minorversion;
 933         resp->cstate.replay_owner = NULL;
 934         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
 935         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
 936         /* Use the deferral mechanism only for NFSv4.0 compounds */
 937         rqstp->rq_usedeferral = (args->minorversion == 0);
 938
 939         /*
 940          * According to RFC3010, this takes precedence over all other errors.
 941          */
 942         status = nfserr_minor_vers_mismatch;
 943         if (args->minorversion > nfsd_supported_minorversion)
 944                 goto out;
 945
 946         if (!nfs41_op_ordering_ok(args)) {
 947                 op = &args->ops[0];
 948                 op->status = nfserr_sequence_pos;
 949                 goto encode_op;
 950         }
 951
 952         status = nfs_ok;
 953         while (!status && resp->opcnt < args->opcnt) {
 954                 op = &args->ops[resp->opcnt++];
 955
 956                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
 957                         resp->opcnt, args->opcnt, op->opnum,
 958                         nfsd4_op_name(op->opnum));
 959                 /*
 960                  * The XDR decode routines may have pre-set op->status;
 961                  * for example, if there is a miscellaneous XDR error
 962                  * it will be set to nfserr_bad_xdr.
 963                  */
 964                 if (op->status)
 965                         goto encode_op;
 966
 967                 /* We must be able to encode a successful response to
 968                  * this operation, with enough room left over to encode a
 969                  * failed response to the next operation.  If we don't
 970                  * have enough room, fail with ERR_RESOURCE.
 971                  */
 972                 slack_bytes = (char *)resp->end - (char *)resp->p;
 973                 if (slack_bytes < COMPOUND_SLACK_SPACE
 974                                 + COMPOUND_ERR_SLACK_SPACE) {
 975                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 976                         op->status = nfserr_resource;
 977                         goto encode_op;
 978                 }
 979
 980                 opdesc = &nfsd4_ops[op->opnum];
 981
 982                 if (!cstate->current_fh.fh_dentry) {
 983                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 984                                 op->status = nfserr_nofilehandle;
 985                                 goto encode_op;
 986                         }
 987                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 988                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 989                         op->status = nfserr_moved;
 990                         goto encode_op;
 991                 }
 992
 993                 if (opdesc->op_func)
 994                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 995                 else
 996                         BUG_ON(op->status == nfs_ok);
 997
 998 encode_op:
 999                 /* Only from SEQUENCE or CREATE_SESSION */
1000                 if (resp->cstate.status == nfserr_replay_cache) {
1001                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1002                         if (nfsd4_not_cached(resp))
1003                                 status = nfsd4_enc_uncached_replay(args, resp);
1004                         else
1005                                 status = op->status;
1006                         goto out;
1007                 }
1008                 if (op->status == nfserr_replay_me) {
1009                         op->replay = &cstate->replay_owner->so_replay;
1010                         nfsd4_encode_replay(resp, op);
1011                         status = op->status = op->replay->rp_status;
1012                 } else {
1013                         nfsd4_encode_operation(resp, op);
1014                         status = op->status;
1015                 }
1016
1017                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1018                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1019                         be32_to_cpu(status));
1020
1021                 if (cstate->replay_owner) {
1022                         nfs4_put_stateowner(cstate->replay_owner);
1023                         cstate->replay_owner = NULL;
1024                 }
1025                 /* XXX Ugh, we need to get rid of this kind of special case: */
1026                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1027                         fput(op->u.read.rd_filp);
1028
1029                 nfsd4_increment_op_stats(op->opnum);
1030         }
1031         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1032                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1033                 status = nfserr_jukebox;
1034         }
1035
1036         resp->cstate.status = status;
1037         fh_put(&resp->cstate.current_fh);
1038         fh_put(&resp->cstate.save_fh);
1039         BUG_ON(resp->cstate.replay_owner);
1040 out:
1041         nfsd4_release_compoundargs(args);
1042         /* Reset deferral mechanism for RPC deferrals */
1043         rqstp->rq_usedeferral = 1;
1044         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1045         return status;
1046 }
1047
1048 static struct nfsd4_operation nfsd4_ops[] = {
1049         [OP_ACCESS] = {
1050                 .op_func = (nfsd4op_func)nfsd4_access,
1051                 .op_name = "OP_ACCESS",
1052         },
1053         [OP_CLOSE] = {
1054                 .op_func = (nfsd4op_func)nfsd4_close,
1055                 .op_name = "OP_CLOSE",
1056         },
1057         [OP_COMMIT] = {
1058                 .op_func = (nfsd4op_func)nfsd4_commit,
1059                 .op_name = "OP_COMMIT",
1060         },
1061         [OP_CREATE] = {
1062                 .op_func = (nfsd4op_func)nfsd4_create,
1063                 .op_name = "OP_CREATE",
1064         },
1065         [OP_DELEGRETURN] = {
1066                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1067                 .op_name = "OP_DELEGRETURN",
1068         },
1069         [OP_GETATTR] = {
1070                 .op_func = (nfsd4op_func)nfsd4_getattr,
1071                 .op_flags = ALLOWED_ON_ABSENT_FS,
1072                 .op_name = "OP_GETATTR",
1073         },
1074         [OP_GETFH] = {
1075                 .op_func = (nfsd4op_func)nfsd4_getfh,
1076                 .op_name = "OP_GETFH",
1077         },
1078         [OP_LINK] = {
1079                 .op_func = (nfsd4op_func)nfsd4_link,
1080                 .op_name = "OP_LINK",
1081         },
1082         [OP_LOCK] = {
1083                 .op_func = (nfsd4op_func)nfsd4_lock,
1084                 .op_name = "OP_LOCK",
1085         },
1086         [OP_LOCKT] = {
1087                 .op_func = (nfsd4op_func)nfsd4_lockt,
1088                 .op_name = "OP_LOCKT",
1089         },
1090         [OP_LOCKU] = {
1091                 .op_func = (nfsd4op_func)nfsd4_locku,
1092                 .op_name = "OP_LOCKU",
1093         },
1094         [OP_LOOKUP] = {
1095                 .op_func = (nfsd4op_func)nfsd4_lookup,
1096                 .op_name = "OP_LOOKUP",
1097         },
1098         [OP_LOOKUPP] = {
1099                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1100                 .op_name = "OP_LOOKUPP",
1101         },
1102         [OP_NVERIFY] = {
1103                 .op_func = (nfsd4op_func)nfsd4_nverify,
1104                 .op_name = "OP_NVERIFY",
1105         },
1106         [OP_OPEN] = {
1107                 .op_func = (nfsd4op_func)nfsd4_open,
1108                 .op_name = "OP_OPEN",
1109         },
1110         [OP_OPEN_CONFIRM] = {
1111                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1112                 .op_name = "OP_OPEN_CONFIRM",
1113         },
1114         [OP_OPEN_DOWNGRADE] = {
1115                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1116                 .op_name = "OP_OPEN_DOWNGRADE",
1117         },
1118         [OP_PUTFH] = {
1119                 .op_func = (nfsd4op_func)nfsd4_putfh,
1120                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1121                 .op_name = "OP_PUTFH",
1122         },
1123         [OP_PUTPUBFH] = {
1124                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1125                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1126                 .op_name = "OP_PUTPUBFH",
1127         },
1128         [OP_PUTROOTFH] = {
1129                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1130                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1131                 .op_name = "OP_PUTROOTFH",
1132         },
1133         [OP_READ] = {
1134                 .op_func = (nfsd4op_func)nfsd4_read,
1135                 .op_name = "OP_READ",
1136         },
1137         [OP_READDIR] = {
1138                 .op_func = (nfsd4op_func)nfsd4_readdir,
1139                 .op_name = "OP_READDIR",
1140         },
1141         [OP_READLINK] = {
1142                 .op_func = (nfsd4op_func)nfsd4_readlink,
1143                 .op_name = "OP_READLINK",
1144         },
1145         [OP_REMOVE] = {
1146                 .op_func = (nfsd4op_func)nfsd4_remove,
1147                 .op_name = "OP_REMOVE",
1148         },
1149         [OP_RENAME] = {
1150                 .op_name = "OP_RENAME",
1151                 .op_func = (nfsd4op_func)nfsd4_rename,
1152         },
1153         [OP_RENEW] = {
1154                 .op_func = (nfsd4op_func)nfsd4_renew,
1155                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1156                 .op_name = "OP_RENEW",
1157         },
1158         [OP_RESTOREFH] = {
1159                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1160                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1161                 .op_name = "OP_RESTOREFH",
1162         },
1163         [OP_SAVEFH] = {
1164                 .op_func = (nfsd4op_func)nfsd4_savefh,
1165                 .op_name = "OP_SAVEFH",
1166         },
1167         [OP_SECINFO] = {
1168                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1169                 .op_name = "OP_SECINFO",
1170         },
1171         [OP_SETATTR] = {
1172                 .op_func = (nfsd4op_func)nfsd4_setattr,
1173                 .op_name = "OP_SETATTR",
1174         },
1175         [OP_SETCLIENTID] = {
1176                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1177                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1178                 .op_name = "OP_SETCLIENTID",
1179         },
1180         [OP_SETCLIENTID_CONFIRM] = {
1181                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1182                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1183                 .op_name = "OP_SETCLIENTID_CONFIRM",
1184         },
1185         [OP_VERIFY] = {
1186                 .op_func = (nfsd4op_func)nfsd4_verify,
1187                 .op_name = "OP_VERIFY",
1188         },
1189         [OP_WRITE] = {
1190                 .op_func = (nfsd4op_func)nfsd4_write,
1191                 .op_name = "OP_WRITE",
1192         },
1193         [OP_RELEASE_LOCKOWNER] = {
1194                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1195                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1196                 .op_name = "OP_RELEASE_LOCKOWNER",
1197         },
1198
1199         /* NFSv4.1 operations */
1200         [OP_EXCHANGE_ID] = {
1201                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1202                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1203                 .op_name = "OP_EXCHANGE_ID",
1204         },
1205         [OP_CREATE_SESSION] = {
1206                 .op_func = (nfsd4op_func)nfsd4_create_session,
1207                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1208                 .op_name = "OP_CREATE_SESSION",
1209         },
1210         [OP_DESTROY_SESSION] = {
1211                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1212                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1213                 .op_name = "OP_DESTROY_SESSION",
1214         },
1215         [OP_SEQUENCE] = {
1216                 .op_func = (nfsd4op_func)nfsd4_sequence,
1217                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1218                 .op_name = "OP_SEQUENCE",
1219         },
1220 };
1221
1222 static const char *nfsd4_op_name(unsigned opnum)
1223 {
1224         if (opnum < ARRAY_SIZE(nfsd4_ops))
1225                 return nfsd4_ops[opnum].op_name;
1226         return "unknown_operation";
1227 }
1228
1229 #define nfs4svc_decode_voidargs         NULL
1230 #define nfs4svc_release_void            NULL
1231 #define nfsd4_voidres                   nfsd4_voidargs
1232 #define nfs4svc_release_compound        NULL
1233 struct nfsd4_voidargs { int dummy; };
1234
1235 #define PROC(name, argt, rest, relt, cache, respsize)   \
1236  { (svc_procfunc) nfsd4_proc_##name,            \
1237    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1238    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1239    (kxdrproc_t) nfs4svc_release_##relt,         \
1240    sizeof(struct nfsd4_##argt##args),           \
1241    sizeof(struct nfsd4_##rest##res),            \
1242    0,                                           \
1243    cache,                                       \
1244    respsize,                                    \
1245  }
1246
1247 /*
1248  * TODO: At the present time, the NFSv4 server does not do XID caching
1249  * of requests.  Implementing XID caching would not be a serious problem,
1250  * although it would require a mild change in interfaces since one
1251  * doesn't know whether an NFSv4 request is idempotent until after the
1252  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1253  * Astrand's regression testsuite for NFSv4 servers), which reuses
1254  * XID's liberally, so I've left it unimplemented until pynfs generates
1255  * better XID's.
1256  */
1257 static struct svc_procedure             nfsd_procedures4[2] = {
1258   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1259   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1260 };
1261
1262 struct svc_version      nfsd_version4 = {
1263                 .vs_vers        = 4,
1264                 .vs_nproc       = 2,
1265                 .vs_proc        = nfsd_procedures4,
1266                 .vs_dispatch    = nfsd_dispatch,
1267                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1268 };
1269
1270 /*
1271  * Local variables:
1272  *  c-basic-offset: 8
1273  * End:
1274  */