fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "cache.h"
  39 #include "xdr4.h"
  40 #include "vfs.h"
  41
  42 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  43
  44 static u32 nfsd_attrmask[] = {
  45         NFSD_WRITEABLE_ATTRS_WORD0,
  46         NFSD_WRITEABLE_ATTRS_WORD1,
  47         NFSD_WRITEABLE_ATTRS_WORD2
  48 };
  49
  50 static u32 nfsd41_ex_attrmask[] = {
  51         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  52         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  53         NFSD_SUPPATTR_EXCLCREAT_WORD2
  54 };
  55
  56 static __be32
  57 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  58                    u32 *bmval, u32 *writable)
  59 {
  60         struct dentry *dentry = cstate->current_fh.fh_dentry;
  61
  62         /*
  63          * Check about attributes are supported by the NFSv4 server or not.
  64          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  65          */
  66         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  67             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  68             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  69                 return nfserr_attrnotsupp;
  70
  71         /*
  72          * Check FATTR4_WORD0_ACL can be supported
  73          * in current environment or not.
  74          */
  75         if (bmval[0] & FATTR4_WORD0_ACL) {
  76                 if (!IS_POSIXACL(dentry->d_inode))
  77                         return nfserr_attrnotsupp;
  78         }
  79
  80         /*
  81          * According to spec, read-only attributes return ERR_INVAL.
  82          */
  83         if (writable) {
  84                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  85                     (bmval[2] & ~writable[2]))
  86                         return nfserr_inval;
  87         }
  88
  89         return nfs_ok;
  90 }
  91
  92 static __be32
  93 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  94         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  95 {
  96         __be32 status = nfs_ok;
  97
  98         if (open->op_create == NFS4_OPEN_CREATE) {
  99                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 100                     || open->op_createmode == NFS4_CREATE_GUARDED)
 101                         status = check_attr_support(rqstp, cstate,
 102                                         open->op_bmval, nfsd_attrmask);
 103                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 104                         status = check_attr_support(rqstp, cstate,
 105                                         open->op_bmval, nfsd41_ex_attrmask);
 106         }
 107
 108         return status;
 109 }
 110
 111 static int
 112 is_create_with_attrs(struct nfsd4_open *open)
 113 {
 114         return open->op_create == NFS4_OPEN_CREATE
 115                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 116                     || open->op_createmode == NFS4_CREATE_GUARDED
 117                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 118 }
 119
 120 /*
 121  * if error occurs when setting the acl, just clear the acl bit
 122  * in the returned attr bitmap.
 123  */
 124 static void
 125 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 126                 struct nfs4_acl *acl, u32 *bmval)
 127 {
 128         __be32 status;
 129
 130         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 131         if (status)
 132                 /*
 133                  * We should probably fail the whole open at this point,
 134                  * but we've already created the file, so it's too late;
 135                  * So this seems the least of evils:
 136                  */
 137                 bmval[0] &= ~FATTR4_WORD0_ACL;
 138 }
 139
 140 static inline void
 141 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 142 {
 143         fh_put(dst);
 144         dget(src->fh_dentry);
 145         if (src->fh_export)
 146                 cache_get(&src->fh_export->h);
 147         *dst = *src;
 148 }
 149
 150 static __be32
 151 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 152 {
 153         __be32 status;
 154
 155         if (open->op_truncate &&
 156                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 157                 return nfserr_inval;
 158
 159         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 160                 accmode |= NFSD_MAY_READ;
 161         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 162                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 163         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 164                 accmode |= NFSD_MAY_WRITE;
 165
 166         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 167
 168         return status;
 169 }
 170
 171 static __be32
 172 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 173 {
 174         struct svc_fh resfh;
 175         __be32 status;
 176         int created = 0;
 177
 178         fh_init(&resfh, NFS4_FHSIZE);
 179         open->op_truncate = 0;
 180
 181         if (open->op_create) {
 182                 /* FIXME: check session persistence and pnfs flags.
 183                  * The nfsv4.1 spec requires the following semantics:
 184                  *
 185                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 186                  * Reply Cache  | server |                 |
 187                  * -------------+--------+-----------------+--------------------
 188                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 189                  *              |        |                 | (SHOULD)
 190                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 191                  *              |        |                 | (SHOULD NOT)
 192                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 193                  * yes          | no     | GUARDED4        | GUARDED4
 194                  * yes          | yes    | GUARDED4        | GUARDED4
 195                  */
 196
 197                 /*
 198                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 199                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 200                  */
 201                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 202                                         open->op_fname.len, &open->op_iattr,
 203                                         &resfh, open->op_createmode,
 204                                         (u32 *)open->op_verf.data,
 205                                         &open->op_truncate, &created);
 206
 207                 /*
 208                  * Following rfc 3530 14.2.16, use the returned bitmask
 209                  * to indicate which attributes we used to store the
 210                  * verifier:
 211                  */
 212                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 213                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 214                                                 FATTR4_WORD1_TIME_MODIFY);
 215         } else {
 216                 status = nfsd_lookup(rqstp, current_fh,
 217                                      open->op_fname.data, open->op_fname.len, &resfh);
 218                 fh_unlock(current_fh);
 219         }
 220         if (status)
 221                 goto out;
 222
 223         if (is_create_with_attrs(open) && open->op_acl != NULL)
 224                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 225
 226         set_change_info(&open->op_cinfo, current_fh);
 227         fh_dup2(current_fh, &resfh);
 228
 229         /* set reply cache */
 230         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 231                         &resfh.fh_handle);
 232         if (!created)
 233                 status = do_open_permission(rqstp, current_fh, open,
 234                                             NFSD_MAY_NOP);
 235
 236 out:
 237         fh_put(&resfh);
 238         return status;
 239 }
 240
 241 static __be32
 242 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 243 {
 244         __be32 status;
 245
 246         /* Only reclaims from previously confirmed clients are valid */
 247         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 248                 return status;
 249
 250         /* We don't know the target directory, and therefore can not
 251         * set the change info
 252         */
 253
 254         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 255
 256         /* set replay cache */
 257         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 258                         &current_fh->fh_handle);
 259
 260         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 261                 (open->op_iattr.ia_size == 0);
 262
 263         status = do_open_permission(rqstp, current_fh, open,
 264                                     NFSD_MAY_OWNER_OVERRIDE);
 265
 266         return status;
 267 }
 268
 269 static void
 270 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 271 {
 272         struct nfsd4_sessionid *sid =
 273                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 274
 275         clid->cl_boot = sid->clientid.cl_boot;
 276         clid->cl_id = sid->clientid.cl_id;
 277 }
 278
 279 static __be32
 280 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 281            struct nfsd4_open *open)
 282 {
 283         __be32 status;
 284         struct nfsd4_compoundres *resp;
 285
 286         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 287                 (int)open->op_fname.len, open->op_fname.data,
 288                 open->op_stateowner);
 289
 290         /* This check required by spec. */
 291         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 292                 return nfserr_inval;
 293
 294         if (nfsd4_has_session(cstate))
 295                 copy_clientid(&open->op_clientid, cstate->session);
 296
 297         nfs4_lock_state();
 298
 299         /* check seqid for replay. set nfs4_owner */
 300         resp = rqstp->rq_resp;
 301         status = nfsd4_process_open1(&resp->cstate, open);
 302         if (status == nfserr_replay_me) {
 303                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 304                 fh_put(&cstate->current_fh);
 305                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 306                                 &rp->rp_openfh);
 307                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 308                 if (status)
 309                         dprintk("nfsd4_open: replay failed"
 310                                 " restoring previous filehandle\n");
 311                 else
 312                         status = nfserr_replay_me;
 313         }
 314         if (status)
 315                 goto out;
 316
 317         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 318         if (status)
 319                 goto out;
 320
 321         /* Openowner is now set, so sequence id will get bumped.  Now we need
 322          * these checks before we do any creates: */
 323         status = nfserr_grace;
 324         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 325                 goto out;
 326         status = nfserr_no_grace;
 327         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 328                 goto out;
 329
 330         switch (open->op_claim_type) {
 331                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 332                 case NFS4_OPEN_CLAIM_NULL:
 333                         /*
 334                          * (1) set CURRENT_FH to the file being opened,
 335                          * creating it if necessary, (2) set open->op_cinfo,
 336                          * (3) set open->op_truncate if the file is to be
 337                          * truncated after opening, (4) do permission checking.
 338                          */
 339                         status = do_open_lookup(rqstp, &cstate->current_fh,
 340                                                 open);
 341                         if (status)
 342                                 goto out;
 343                         break;
 344                 case NFS4_OPEN_CLAIM_PREVIOUS:
 345                         open->op_stateowner->so_confirmed = 1;
 346                         /*
 347                          * The CURRENT_FH is already set to the file being
 348                          * opened.  (1) set open->op_cinfo, (2) set
 349                          * open->op_truncate if the file is to be truncated
 350                          * after opening, (3) do permission checking.
 351                         */
 352                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 353                                                  open);
 354                         if (status)
 355                                 goto out;
 356                         break;
 357                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 358                         open->op_stateowner->so_confirmed = 1;
 359                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 360                                 open->op_claim_type);
 361                         status = nfserr_notsupp;
 362                         goto out;
 363                 default:
 364                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 365                                 open->op_claim_type);
 366                         status = nfserr_inval;
 367                         goto out;
 368         }
 369         /*
 370          * nfsd4_process_open2() does the actual opening of the file.  If
 371          * successful, it (1) truncates the file if open->op_truncate was
 372          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 373          */
 374         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 375 out:
 376         if (open->op_stateowner) {
 377                 nfs4_get_stateowner(open->op_stateowner);
 378                 cstate->replay_owner = open->op_stateowner;
 379         }
 380         nfs4_unlock_state();
 381         return status;
 382 }
 383
 384 /*
 385  * filehandle-manipulating ops.
 386  */
 387 static __be32
 388 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 389             struct svc_fh **getfh)
 390 {
 391         if (!cstate->current_fh.fh_dentry)
 392                 return nfserr_nofilehandle;
 393
 394         *getfh = &cstate->current_fh;
 395         return nfs_ok;
 396 }
 397
 398 static __be32
 399 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 400             struct nfsd4_putfh *putfh)
 401 {
 402         fh_put(&cstate->current_fh);
 403         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 404         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 405                putfh->pf_fhlen);
 406         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 407 }
 408
 409 static __be32
 410 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 411                 void *arg)
 412 {
 413         __be32 status;
 414
 415         fh_put(&cstate->current_fh);
 416         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 417         return status;
 418 }
 419
 420 static __be32
 421 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 422                 void *arg)
 423 {
 424         if (!cstate->save_fh.fh_dentry)
 425                 return nfserr_restorefh;
 426
 427         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 428         return nfs_ok;
 429 }
 430
 431 static __be32
 432 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 433              void *arg)
 434 {
 435         if (!cstate->current_fh.fh_dentry)
 436                 return nfserr_nofilehandle;
 437
 438         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 439         return nfs_ok;
 440 }
 441
 442 /*
 443  * misc nfsv4 ops
 444  */
 445 static __be32
 446 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 447              struct nfsd4_access *access)
 448 {
 449         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 450                 return nfserr_inval;
 451
 452         access->ac_resp_access = access->ac_req_access;
 453         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 454                            &access->ac_supported);
 455 }
 456
 457 static __be32
 458 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 459              struct nfsd4_commit *commit)
 460 {
 461         __be32 status;
 462
 463         u32 *p = (u32 *)commit->co_verf.data;
 464         *p++ = nfssvc_boot.tv_sec;
 465         *p++ = nfssvc_boot.tv_usec;
 466
 467         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 468                              commit->co_count);
 469         if (status == nfserr_symlink)
 470                 status = nfserr_inval;
 471         return status;
 472 }
 473
 474 static __be32
 475 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 476              struct nfsd4_create *create)
 477 {
 478         struct svc_fh resfh;
 479         __be32 status;
 480         dev_t rdev;
 481
 482         fh_init(&resfh, NFS4_FHSIZE);
 483
 484         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 485                            NFSD_MAY_CREATE);
 486         if (status == nfserr_symlink)
 487                 status = nfserr_notdir;
 488         if (status)
 489                 return status;
 490
 491         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 492                                     nfsd_attrmask);
 493         if (status)
 494                 return status;
 495
 496         switch (create->cr_type) {
 497         case NF4LNK:
 498                 /* ugh! we have to null-terminate the linktext, or
 499                  * vfs_symlink() will choke.  it is always safe to
 500                  * null-terminate by brute force, since at worst we
 501                  * will overwrite the first byte of the create namelen
 502                  * in the XDR buffer, which has already been extracted
 503                  * during XDR decode.
 504                  */
 505                 create->cr_linkname[create->cr_linklen] = 0;
 506
 507                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 508                                       create->cr_name, create->cr_namelen,
 509                                       create->cr_linkname, create->cr_linklen,
 510                                       &resfh, &create->cr_iattr);
 511                 break;
 512
 513         case NF4BLK:
 514                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 515                 if (MAJOR(rdev) != create->cr_specdata1 ||
 516                     MINOR(rdev) != create->cr_specdata2)
 517                         return nfserr_inval;
 518                 status = nfsd_create(rqstp, &cstate->current_fh,
 519                                      create->cr_name, create->cr_namelen,
 520                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 521                 break;
 522
 523         case NF4CHR:
 524                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 525                 if (MAJOR(rdev) != create->cr_specdata1 ||
 526                     MINOR(rdev) != create->cr_specdata2)
 527                         return nfserr_inval;
 528                 status = nfsd_create(rqstp, &cstate->current_fh,
 529                                      create->cr_name, create->cr_namelen,
 530                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 531                 break;
 532
 533         case NF4SOCK:
 534                 status = nfsd_create(rqstp, &cstate->current_fh,
 535                                      create->cr_name, create->cr_namelen,
 536                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 537                 break;
 538
 539         case NF4FIFO:
 540                 status = nfsd_create(rqstp, &cstate->current_fh,
 541                                      create->cr_name, create->cr_namelen,
 542                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 543                 break;
 544
 545         case NF4DIR:
 546                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 547                 status = nfsd_create(rqstp, &cstate->current_fh,
 548                                      create->cr_name, create->cr_namelen,
 549                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 550                 break;
 551
 552         default:
 553                 status = nfserr_badtype;
 554         }
 555
 556         if (status)
 557                 goto out;
 558
 559         if (create->cr_acl != NULL)
 560                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 561                                 create->cr_bmval);
 562
 563         fh_unlock(&cstate->current_fh);
 564         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 565         fh_dup2(&cstate->current_fh, &resfh);
 566 out:
 567         fh_put(&resfh);
 568         return status;
 569 }
 570
 571 static __be32
 572 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 573               struct nfsd4_getattr *getattr)
 574 {
 575         __be32 status;
 576
 577         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 578         if (status)
 579                 return status;
 580
 581         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 582                 return nfserr_inval;
 583
 584         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 585         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 586         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 587
 588         getattr->ga_fhp = &cstate->current_fh;
 589         return nfs_ok;
 590 }
 591
 592 static __be32
 593 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 594            struct nfsd4_link *link)
 595 {
 596         __be32 status = nfserr_nofilehandle;
 597
 598         if (!cstate->save_fh.fh_dentry)
 599                 return status;
 600         status = nfsd_link(rqstp, &cstate->current_fh,
 601                            link->li_name, link->li_namelen, &cstate->save_fh);
 602         if (!status)
 603                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 604         return status;
 605 }
 606
 607 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 608 {
 609         struct svc_fh tmp_fh;
 610         __be32 ret;
 611
 612         fh_init(&tmp_fh, NFS4_FHSIZE);
 613         ret = exp_pseudoroot(rqstp, &tmp_fh);
 614         if (ret)
 615                 return ret;
 616         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 617                 fh_put(&tmp_fh);
 618                 return nfserr_noent;
 619         }
 620         fh_put(&tmp_fh);
 621         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 622 }
 623
 624 static __be32
 625 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 626               void *arg)
 627 {
 628         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 629 }
 630
 631 static __be32
 632 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 633              struct nfsd4_lookup *lookup)
 634 {
 635         return nfsd_lookup(rqstp, &cstate->current_fh,
 636                            lookup->lo_name, lookup->lo_len,
 637                            &cstate->current_fh);
 638 }
 639
 640 static __be32
 641 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 642            struct nfsd4_read *read)
 643 {
 644         __be32 status;
 645
 646         /* no need to check permission - this will be done in nfsd_read() */
 647
 648         read->rd_filp = NULL;
 649         if (read->rd_offset >= OFFSET_MAX)
 650                 return nfserr_inval;
 651
 652         nfs4_lock_state();
 653         /* check stateid */
 654         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 655                                                  RD_STATE, &read->rd_filp))) {
 656                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 657                 goto out;
 658         }
 659         if (read->rd_filp)
 660                 get_file(read->rd_filp);
 661         status = nfs_ok;
 662 out:
 663         nfs4_unlock_state();
 664         read->rd_rqstp = rqstp;
 665         read->rd_fhp = &cstate->current_fh;
 666         return status;
 667 }
 668
 669 static __be32
 670 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 671               struct nfsd4_readdir *readdir)
 672 {
 673         u64 cookie = readdir->rd_cookie;
 674         static const nfs4_verifier zeroverf;
 675
 676         /* no need to check permission - this will be done in nfsd_readdir() */
 677
 678         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 679                 return nfserr_inval;
 680
 681         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 682         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 683         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 684
 685         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 686             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 687                 return nfserr_bad_cookie;
 688
 689         readdir->rd_rqstp = rqstp;
 690         readdir->rd_fhp = &cstate->current_fh;
 691         return nfs_ok;
 692 }
 693
 694 static __be32
 695 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 696                struct nfsd4_readlink *readlink)
 697 {
 698         readlink->rl_rqstp = rqstp;
 699         readlink->rl_fhp = &cstate->current_fh;
 700         return nfs_ok;
 701 }
 702
 703 static __be32
 704 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 705              struct nfsd4_remove *remove)
 706 {
 707         __be32 status;
 708
 709         if (locks_in_grace())
 710                 return nfserr_grace;
 711         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 712                              remove->rm_name, remove->rm_namelen);
 713         if (status == nfserr_symlink)
 714                 return nfserr_notdir;
 715         if (!status) {
 716                 fh_unlock(&cstate->current_fh);
 717                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 718         }
 719         return status;
 720 }
 721
 722 static __be32
 723 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 724              struct nfsd4_rename *rename)
 725 {
 726         __be32 status = nfserr_nofilehandle;
 727
 728         if (!cstate->save_fh.fh_dentry)
 729                 return status;
 730         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 731                                         & NFSEXP_NOSUBTREECHECK))
 732                 return nfserr_grace;
 733         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 734                              rename->rn_snamelen, &cstate->current_fh,
 735                              rename->rn_tname, rename->rn_tnamelen);
 736
 737         /* the underlying filesystem returns different error's than required
 738          * by NFSv4. both save_fh and current_fh have been verified.. */
 739         if (status == nfserr_isdir)
 740                 status = nfserr_exist;
 741         else if ((status == nfserr_notdir) &&
 742                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 743                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 744                 status = nfserr_exist;
 745         else if (status == nfserr_symlink)
 746                 status = nfserr_notdir;
 747
 748         if (!status) {
 749                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 750                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 751         }
 752         return status;
 753 }
 754
 755 static __be32
 756 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 757               struct nfsd4_secinfo *secinfo)
 758 {
 759         struct svc_fh resfh;
 760         struct svc_export *exp;
 761         struct dentry *dentry;
 762         __be32 err;
 763
 764         fh_init(&resfh, NFS4_FHSIZE);
 765         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 766         if (err)
 767                 return err;
 768         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 769                                     secinfo->si_name, secinfo->si_namelen,
 770                                     &exp, &dentry);
 771         if (err)
 772                 return err;
 773         if (dentry->d_inode == NULL) {
 774                 exp_put(exp);
 775                 err = nfserr_noent;
 776         } else
 777                 secinfo->si_exp = exp;
 778         dput(dentry);
 779         if (cstate->minorversion)
 780                 /* See rfc 5661 section 2.6.3.1.1.8 */
 781                 fh_put(&cstate->current_fh);
 782         return err;
 783 }
 784
 785 static __be32
 786 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 787               struct nfsd4_secinfo_no_name *sin)
 788 {
 789         __be32 err;
 790
 791         switch (sin->sin_style) {
 792         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 793                 break;
 794         case NFS4_SECINFO_STYLE4_PARENT:
 795                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 796                 if (err)
 797                         return err;
 798                 break;
 799         default:
 800                 return nfserr_inval;
 801         }
 802         exp_get(cstate->current_fh.fh_export);
 803         sin->sin_exp = cstate->current_fh.fh_export;
 804         fh_put(&cstate->current_fh);
 805         return nfs_ok;
 806 }
 807
 808 static __be32
 809 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 810               struct nfsd4_setattr *setattr)
 811 {
 812         __be32 status = nfs_ok;
 813
 814         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 815                 nfs4_lock_state();
 816                 status = nfs4_preprocess_stateid_op(cstate,
 817                         &setattr->sa_stateid, WR_STATE, NULL);
 818                 nfs4_unlock_state();
 819                 if (status) {
 820                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 821                         return status;
 822                 }
 823         }
 824         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 825         if (status)
 826                 return status;
 827         status = nfs_ok;
 828
 829         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 830                                     nfsd_attrmask);
 831         if (status)
 832                 goto out;
 833
 834         if (setattr->sa_acl != NULL)
 835                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 836                                             setattr->sa_acl);
 837         if (status)
 838                 goto out;
 839         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 840                                 0, (time_t)0);
 841 out:
 842         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 843         return status;
 844 }
 845
 846 static __be32
 847 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 848             struct nfsd4_write *write)
 849 {
 850         stateid_t *stateid = &write->wr_stateid;
 851         struct file *filp = NULL;
 852         u32 *p;
 853         __be32 status = nfs_ok;
 854         unsigned long cnt;
 855
 856         /* no need to check permission - this will be done in nfsd_write() */
 857
 858         if (write->wr_offset >= OFFSET_MAX)
 859                 return nfserr_inval;
 860
 861         nfs4_lock_state();
 862         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 863         if (filp)
 864                 get_file(filp);
 865         nfs4_unlock_state();
 866
 867         if (status) {
 868                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 869                 return status;
 870         }
 871
 872         cnt = write->wr_buflen;
 873         write->wr_how_written = write->wr_stable_how;
 874         p = (u32 *)write->wr_verifier.data;
 875         *p++ = nfssvc_boot.tv_sec;
 876         *p++ = nfssvc_boot.tv_usec;
 877
 878         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 879                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 880                              &cnt, &write->wr_how_written);
 881         if (filp)
 882                 fput(filp);
 883
 884         write->wr_bytes_written = cnt;
 885
 886         if (status == nfserr_symlink)
 887                 status = nfserr_inval;
 888         return status;
 889 }
 890
 891 /* This routine never returns NFS_OK!  If there are no other errors, it
 892  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 893  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 894  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 895  */
 896 static __be32
 897 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 898              struct nfsd4_verify *verify)
 899 {
 900         __be32 *buf, *p;
 901         int count;
 902         __be32 status;
 903
 904         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 905         if (status)
 906                 return status;
 907
 908         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 909         if (status)
 910                 return status;
 911
 912         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 913             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 914                 return nfserr_inval;
 915         if (verify->ve_attrlen & 3)
 916                 return nfserr_inval;
 917
 918         /* count in words:
 919          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 920          */
 921         count = 4 + (verify->ve_attrlen >> 2);
 922         buf = kmalloc(count << 2, GFP_KERNEL);
 923         if (!buf)
 924                 return nfserr_resource;
 925
 926         status = nfsd4_encode_fattr(&cstate->current_fh,
 927                                     cstate->current_fh.fh_export,
 928                                     cstate->current_fh.fh_dentry, buf,
 929                                     &count, verify->ve_bmval,
 930                                     rqstp, 0);
 931
 932         /* this means that nfsd4_encode_fattr() ran out of space */
 933         if (status == nfserr_resource && count == 0)
 934                 status = nfserr_not_same;
 935         if (status)
 936                 goto out_kfree;
 937
 938         /* skip bitmap */
 939         p = buf + 1 + ntohl(buf[0]);
 940         status = nfserr_not_same;
 941         if (ntohl(*p++) != verify->ve_attrlen)
 942                 goto out_kfree;
 943         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 944                 status = nfserr_same;
 945
 946 out_kfree:
 947         kfree(buf);
 948         return status;
 949 }
 950
 951 static __be32
 952 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 953               struct nfsd4_verify *verify)
 954 {
 955         __be32 status;
 956
 957         status = _nfsd4_verify(rqstp, cstate, verify);
 958         return status == nfserr_not_same ? nfs_ok : status;
 959 }
 960
 961 static __be32
 962 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 963              struct nfsd4_verify *verify)
 964 {
 965         __be32 status;
 966
 967         status = _nfsd4_verify(rqstp, cstate, verify);
 968         return status == nfserr_same ? nfs_ok : status;
 969 }
 970
 971 /*
 972  * NULL call.
 973  */
 974 static __be32
 975 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 976 {
 977         return nfs_ok;
 978 }
 979
 980 static inline void nfsd4_increment_op_stats(u32 opnum)
 981 {
 982         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 983                 nfsdstats.nfs4_opcount[opnum]++;
 984 }
 985
 986 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 987                               void *);
 988 enum nfsd4_op_flags {
 989         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 990         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
 991         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
 992         /* For rfc 5661 section 2.6.3.1.1: */
 993         OP_HANDLES_WRONGSEC = 1 << 3,
 994         OP_IS_PUTFH_LIKE = 1 << 4,
 995 };
 996
 997 struct nfsd4_operation {
 998         nfsd4op_func op_func;
 999         u32 op_flags;
1000         char *op_name;
1001 };
1002
1003 static struct nfsd4_operation nfsd4_ops[];
1004
1005 static const char *nfsd4_op_name(unsigned opnum);
1006
1007 /*
1008  * Enforce NFSv4.1 COMPOUND ordering rules:
1009  *
1010  * Also note, enforced elsewhere:
1011  *      - SEQUENCE other than as first op results in
1012  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1013  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1014  *        (Enforced in nfsd4_bind_conn_to_session().)
1015  *      - DESTROY_SESSION must be the final operation in a compound, if
1016  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1017  *        (Enforced in nfsd4_destroy_session().)
1018  */
1019 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1020 {
1021         struct nfsd4_op *op = &args->ops[0];
1022
1023         /* These ordering requirements don't apply to NFSv4.0: */
1024         if (args->minorversion == 0)
1025                 return nfs_ok;
1026         /* This is weird, but OK, not our problem: */
1027         if (args->opcnt == 0)
1028                 return nfs_ok;
1029         if (op->status == nfserr_op_illegal)
1030                 return nfs_ok;
1031         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1032                 return nfserr_op_not_in_session;
1033         if (op->opnum == OP_SEQUENCE)
1034                 return nfs_ok;
1035         if (args->opcnt != 1)
1036                 return nfserr_not_only_op;
1037         return nfs_ok;
1038 }
1039
1040 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1041 {
1042         return &nfsd4_ops[op->opnum];
1043 }
1044
1045 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1046 {
1047         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1048         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1049         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1050         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1051         struct nfsd4_operation *thisd;
1052         struct nfsd4_operation *nextd;
1053
1054         thisd = OPDESC(this);
1055         /*
1056          * Most ops check wronsec on our own; only the putfh-like ops
1057          * have special rules.
1058          */
1059         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1060                 return false;
1061         /*
1062          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1063          * put-filehandle operation if we're not going to use the
1064          * result:
1065          */
1066         if (argp->opcnt == resp->opcnt)
1067                 return false;
1068
1069         nextd = OPDESC(next);
1070         /*
1071          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1072          * errors themselves as necessary; others should check for them
1073          * now:
1074          */
1075         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1076 }
1077
1078 /*
1079  * COMPOUND call.
1080  */
1081 static __be32
1082 nfsd4_proc_compound(struct svc_rqst *rqstp,
1083                     struct nfsd4_compoundargs *args,
1084                     struct nfsd4_compoundres *resp)
1085 {
1086         struct nfsd4_op *op;
1087         struct nfsd4_operation *opdesc;
1088         struct nfsd4_compound_state *cstate = &resp->cstate;
1089         int             slack_bytes;
1090         __be32          status;
1091
1092         resp->xbuf = &rqstp->rq_res;
1093         resp->p = rqstp->rq_res.head[0].iov_base +
1094                                                 rqstp->rq_res.head[0].iov_len;
1095         resp->tagp = resp->p;
1096         /* reserve space for: taglen, tag, and opcnt */
1097         resp->p += 2 + XDR_QUADLEN(args->taglen);
1098         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1099         resp->taglen = args->taglen;
1100         resp->tag = args->tag;
1101         resp->opcnt = 0;
1102         resp->rqstp = rqstp;
1103         resp->cstate.minorversion = args->minorversion;
1104         resp->cstate.replay_owner = NULL;
1105         resp->cstate.session = NULL;
1106         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1107         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1108         /*
1109          * Don't use the deferral mechanism for NFSv4; compounds make it
1110          * too hard to avoid non-idempotency problems.
1111          */
1112         rqstp->rq_usedeferral = 0;
1113
1114         /*
1115          * According to RFC3010, this takes precedence over all other errors.
1116          */
1117         status = nfserr_minor_vers_mismatch;
1118         if (args->minorversion > nfsd_supported_minorversion)
1119                 goto out;
1120
1121         status = nfs41_check_op_ordering(args);
1122         if (status) {
1123                 op = &args->ops[0];
1124                 op->status = status;
1125                 goto encode_op;
1126         }
1127
1128         while (!status && resp->opcnt < args->opcnt) {
1129                 op = &args->ops[resp->opcnt++];
1130
1131                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1132                         resp->opcnt, args->opcnt, op->opnum,
1133                         nfsd4_op_name(op->opnum));
1134                 /*
1135                  * The XDR decode routines may have pre-set op->status;
1136                  * for example, if there is a miscellaneous XDR error
1137                  * it will be set to nfserr_bad_xdr.
1138                  */
1139                 if (op->status)
1140                         goto encode_op;
1141
1142                 /* We must be able to encode a successful response to
1143                  * this operation, with enough room left over to encode a
1144                  * failed response to the next operation.  If we don't
1145                  * have enough room, fail with ERR_RESOURCE.
1146                  */
1147                 slack_bytes = (char *)resp->end - (char *)resp->p;
1148                 if (slack_bytes < COMPOUND_SLACK_SPACE
1149                                 + COMPOUND_ERR_SLACK_SPACE) {
1150                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1151                         op->status = nfserr_resource;
1152                         goto encode_op;
1153                 }
1154
1155                 opdesc = OPDESC(op);
1156
1157                 if (!cstate->current_fh.fh_dentry) {
1158                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1159                                 op->status = nfserr_nofilehandle;
1160                                 goto encode_op;
1161                         }
1162                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1163                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1164                         op->status = nfserr_moved;
1165                         goto encode_op;
1166                 }
1167
1168                 if (opdesc->op_func)
1169                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1170                 else
1171                         BUG_ON(op->status == nfs_ok);
1172
1173                 if (!op->status && need_wrongsec_check(rqstp))
1174                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1175
1176 encode_op:
1177                 /* Only from SEQUENCE */
1178                 if (resp->cstate.status == nfserr_replay_cache) {
1179                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1180                         status = op->status;
1181                         goto out;
1182                 }
1183                 if (op->status == nfserr_replay_me) {
1184                         op->replay = &cstate->replay_owner->so_replay;
1185                         nfsd4_encode_replay(resp, op);
1186                         status = op->status = op->replay->rp_status;
1187                 } else {
1188                         nfsd4_encode_operation(resp, op);
1189                         status = op->status;
1190                 }
1191
1192                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1193                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1194                         be32_to_cpu(status));
1195
1196                 if (cstate->replay_owner) {
1197                         nfs4_put_stateowner(cstate->replay_owner);
1198                         cstate->replay_owner = NULL;
1199                 }
1200                 /* XXX Ugh, we need to get rid of this kind of special case: */
1201                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1202                         fput(op->u.read.rd_filp);
1203
1204                 nfsd4_increment_op_stats(op->opnum);
1205         }
1206
1207         resp->cstate.status = status;
1208         fh_put(&resp->cstate.current_fh);
1209         fh_put(&resp->cstate.save_fh);
1210         BUG_ON(resp->cstate.replay_owner);
1211 out:
1212         nfsd4_release_compoundargs(args);
1213         /* Reset deferral mechanism for RPC deferrals */
1214         rqstp->rq_usedeferral = 1;
1215         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1216         return status;
1217 }
1218
1219 static struct nfsd4_operation nfsd4_ops[] = {
1220         [OP_ACCESS] = {
1221                 .op_func = (nfsd4op_func)nfsd4_access,
1222                 .op_name = "OP_ACCESS",
1223         },
1224         [OP_CLOSE] = {
1225                 .op_func = (nfsd4op_func)nfsd4_close,
1226                 .op_name = "OP_CLOSE",
1227         },
1228         [OP_COMMIT] = {
1229                 .op_func = (nfsd4op_func)nfsd4_commit,
1230                 .op_name = "OP_COMMIT",
1231         },
1232         [OP_CREATE] = {
1233                 .op_func = (nfsd4op_func)nfsd4_create,
1234                 .op_name = "OP_CREATE",
1235         },
1236         [OP_DELEGRETURN] = {
1237                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1238                 .op_name = "OP_DELEGRETURN",
1239         },
1240         [OP_GETATTR] = {
1241                 .op_func = (nfsd4op_func)nfsd4_getattr,
1242                 .op_flags = ALLOWED_ON_ABSENT_FS,
1243                 .op_name = "OP_GETATTR",
1244         },
1245         [OP_GETFH] = {
1246                 .op_func = (nfsd4op_func)nfsd4_getfh,
1247                 .op_name = "OP_GETFH",
1248         },
1249         [OP_LINK] = {
1250                 .op_func = (nfsd4op_func)nfsd4_link,
1251                 .op_name = "OP_LINK",
1252         },
1253         [OP_LOCK] = {
1254                 .op_func = (nfsd4op_func)nfsd4_lock,
1255                 .op_name = "OP_LOCK",
1256         },
1257         [OP_LOCKT] = {
1258                 .op_func = (nfsd4op_func)nfsd4_lockt,
1259                 .op_name = "OP_LOCKT",
1260         },
1261         [OP_LOCKU] = {
1262                 .op_func = (nfsd4op_func)nfsd4_locku,
1263                 .op_name = "OP_LOCKU",
1264         },
1265         [OP_LOOKUP] = {
1266                 .op_func = (nfsd4op_func)nfsd4_lookup,
1267                 .op_flags = OP_HANDLES_WRONGSEC,
1268                 .op_name = "OP_LOOKUP",
1269         },
1270         [OP_LOOKUPP] = {
1271                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1272                 .op_flags = OP_HANDLES_WRONGSEC,
1273                 .op_name = "OP_LOOKUPP",
1274         },
1275         [OP_NVERIFY] = {
1276                 .op_func = (nfsd4op_func)nfsd4_nverify,
1277                 .op_name = "OP_NVERIFY",
1278         },
1279         [OP_OPEN] = {
1280                 .op_func = (nfsd4op_func)nfsd4_open,
1281                 .op_flags = OP_HANDLES_WRONGSEC,
1282                 .op_name = "OP_OPEN",
1283         },
1284         [OP_OPEN_CONFIRM] = {
1285                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1286                 .op_name = "OP_OPEN_CONFIRM",
1287         },
1288         [OP_OPEN_DOWNGRADE] = {
1289                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1290                 .op_name = "OP_OPEN_DOWNGRADE",
1291         },
1292         [OP_PUTFH] = {
1293                 .op_func = (nfsd4op_func)nfsd4_putfh,
1294                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1295                                 | OP_IS_PUTFH_LIKE,
1296                 .op_name = "OP_PUTFH",
1297         },
1298         [OP_PUTPUBFH] = {
1299                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1300                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1301                                 | OP_IS_PUTFH_LIKE,
1302                 .op_name = "OP_PUTPUBFH",
1303         },
1304         [OP_PUTROOTFH] = {
1305                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1306                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1307                                 | OP_IS_PUTFH_LIKE,
1308                 .op_name = "OP_PUTROOTFH",
1309         },
1310         [OP_READ] = {
1311                 .op_func = (nfsd4op_func)nfsd4_read,
1312                 .op_name = "OP_READ",
1313         },
1314         [OP_READDIR] = {
1315                 .op_func = (nfsd4op_func)nfsd4_readdir,
1316                 .op_name = "OP_READDIR",
1317         },
1318         [OP_READLINK] = {
1319                 .op_func = (nfsd4op_func)nfsd4_readlink,
1320                 .op_name = "OP_READLINK",
1321         },
1322         [OP_REMOVE] = {
1323                 .op_func = (nfsd4op_func)nfsd4_remove,
1324                 .op_name = "OP_REMOVE",
1325         },
1326         [OP_RENAME] = {
1327                 .op_name = "OP_RENAME",
1328                 .op_func = (nfsd4op_func)nfsd4_rename,
1329         },
1330         [OP_RENEW] = {
1331                 .op_func = (nfsd4op_func)nfsd4_renew,
1332                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1333                 .op_name = "OP_RENEW",
1334         },
1335         [OP_RESTOREFH] = {
1336                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1337                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1338                                 | OP_IS_PUTFH_LIKE,
1339                 .op_name = "OP_RESTOREFH",
1340         },
1341         [OP_SAVEFH] = {
1342                 .op_func = (nfsd4op_func)nfsd4_savefh,
1343                 .op_flags = OP_HANDLES_WRONGSEC,
1344                 .op_name = "OP_SAVEFH",
1345         },
1346         [OP_SECINFO] = {
1347                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1348                 .op_flags = OP_HANDLES_WRONGSEC,
1349                 .op_name = "OP_SECINFO",
1350         },
1351         [OP_SETATTR] = {
1352                 .op_func = (nfsd4op_func)nfsd4_setattr,
1353                 .op_name = "OP_SETATTR",
1354         },
1355         [OP_SETCLIENTID] = {
1356                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1357                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1358                 .op_name = "OP_SETCLIENTID",
1359         },
1360         [OP_SETCLIENTID_CONFIRM] = {
1361                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1362                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1363                 .op_name = "OP_SETCLIENTID_CONFIRM",
1364         },
1365         [OP_VERIFY] = {
1366                 .op_func = (nfsd4op_func)nfsd4_verify,
1367                 .op_name = "OP_VERIFY",
1368         },
1369         [OP_WRITE] = {
1370                 .op_func = (nfsd4op_func)nfsd4_write,
1371                 .op_name = "OP_WRITE",
1372         },
1373         [OP_RELEASE_LOCKOWNER] = {
1374                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1375                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1376                 .op_name = "OP_RELEASE_LOCKOWNER",
1377         },
1378
1379         /* NFSv4.1 operations */
1380         [OP_EXCHANGE_ID] = {
1381                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1382                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1383                 .op_name = "OP_EXCHANGE_ID",
1384         },
1385         [OP_BIND_CONN_TO_SESSION] = {
1386                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1387                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1388                 .op_name = "OP_BIND_CONN_TO_SESSION",
1389         },
1390         [OP_CREATE_SESSION] = {
1391                 .op_func = (nfsd4op_func)nfsd4_create_session,
1392                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1393                 .op_name = "OP_CREATE_SESSION",
1394         },
1395         [OP_DESTROY_SESSION] = {
1396                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1397                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1398                 .op_name = "OP_DESTROY_SESSION",
1399         },
1400         [OP_SEQUENCE] = {
1401                 .op_func = (nfsd4op_func)nfsd4_sequence,
1402                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1403                 .op_name = "OP_SEQUENCE",
1404         },
1405         [OP_RECLAIM_COMPLETE] = {
1406                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1407                 .op_flags = ALLOWED_WITHOUT_FH,
1408                 .op_name = "OP_RECLAIM_COMPLETE",
1409         },
1410         [OP_SECINFO_NO_NAME] = {
1411                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1412                 .op_flags = OP_HANDLES_WRONGSEC,
1413                 .op_name = "OP_SECINFO_NO_NAME",
1414         },
1415 };
1416
1417 static const char *nfsd4_op_name(unsigned opnum)
1418 {
1419         if (opnum < ARRAY_SIZE(nfsd4_ops))
1420                 return nfsd4_ops[opnum].op_name;
1421         return "unknown_operation";
1422 }
1423
1424 #define nfsd4_voidres                   nfsd4_voidargs
1425 struct nfsd4_voidargs { int dummy; };
1426
1427 /*
1428  * TODO: At the present time, the NFSv4 server does not do XID caching
1429  * of requests.  Implementing XID caching would not be a serious problem,
1430  * although it would require a mild change in interfaces since one
1431  * doesn't know whether an NFSv4 request is idempotent until after the
1432  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1433  * Astrand's regression testsuite for NFSv4 servers), which reuses
1434  * XID's liberally, so I've left it unimplemented until pynfs generates
1435  * better XID's.
1436  */
1437 static struct svc_procedure             nfsd_procedures4[2] = {
1438         [NFSPROC4_NULL] = {
1439                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1440                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1441                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1442                 .pc_ressize = sizeof(struct nfsd4_voidres),
1443                 .pc_cachetype = RC_NOCACHE,
1444                 .pc_xdrressize = 1,
1445         },
1446         [NFSPROC4_COMPOUND] = {
1447                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1448                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1449                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1450                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1451                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1452                 .pc_cachetype = RC_NOCACHE,
1453                 .pc_xdrressize = NFSD_BUFSIZE/4,
1454         },
1455 };
1456
1457 struct svc_version      nfsd_version4 = {
1458                 .vs_vers        = 4,
1459                 .vs_nproc       = 2,
1460                 .vs_proc        = nfsd_procedures4,
1461                 .vs_dispatch    = nfsd_dispatch,
1462                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1463 };
1464
1465 /*
1466  * Local variables:
1467  *  c-basic-offset: 8
1468  * End:
1469  */