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         accmode |= NFSD_MAY_READ_IF_EXEC;
 160
 161         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 162                 accmode |= NFSD_MAY_READ;
 163         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 164                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 165         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 166                 accmode |= NFSD_MAY_WRITE;
 167
 168         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 169
 170         return status;
 171 }
 172
 173 static __be32
 174 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 175 {
 176         struct svc_fh resfh;
 177         __be32 status;
 178         int created = 0;
 179
 180         fh_init(&resfh, NFS4_FHSIZE);
 181         open->op_truncate = 0;
 182
 183         if (open->op_create) {
 184                 /* FIXME: check session persistence and pnfs flags.
 185                  * The nfsv4.1 spec requires the following semantics:
 186                  *
 187                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 188                  * Reply Cache  | server |                 |
 189                  * -------------+--------+-----------------+--------------------
 190                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 191                  *              |        |                 | (SHOULD)
 192                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 193                  *              |        |                 | (SHOULD NOT)
 194                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 195                  * yes          | no     | GUARDED4        | GUARDED4
 196                  * yes          | yes    | GUARDED4        | GUARDED4
 197                  */
 198
 199                 /*
 200                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 201                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 202                  */
 203                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 204                                         open->op_fname.len, &open->op_iattr,
 205                                         &resfh, open->op_createmode,
 206                                         (u32 *)open->op_verf.data,
 207                                         &open->op_truncate, &created);
 208
 209                 /*
 210                  * Following rfc 3530 14.2.16, use the returned bitmask
 211                  * to indicate which attributes we used to store the
 212                  * verifier:
 213                  */
 214                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 215                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 216                                                 FATTR4_WORD1_TIME_MODIFY);
 217         } else {
 218                 status = nfsd_lookup(rqstp, current_fh,
 219                                      open->op_fname.data, open->op_fname.len, &resfh);
 220                 fh_unlock(current_fh);
 221         }
 222         if (status)
 223                 goto out;
 224
 225         if (is_create_with_attrs(open) && open->op_acl != NULL)
 226                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 227
 228         set_change_info(&open->op_cinfo, current_fh);
 229         fh_dup2(current_fh, &resfh);
 230
 231         /* set reply cache */
 232         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 233                         &resfh.fh_handle);
 234         if (!created)
 235                 status = do_open_permission(rqstp, current_fh, open,
 236                                             NFSD_MAY_NOP);
 237
 238 out:
 239         fh_put(&resfh);
 240         return status;
 241 }
 242
 243 static __be32
 244 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 245 {
 246         __be32 status;
 247
 248         /* Only reclaims from previously confirmed clients are valid */
 249         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 250                 return status;
 251
 252         /* We don't know the target directory, and therefore can not
 253         * set the change info
 254         */
 255
 256         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 257
 258         /* set replay cache */
 259         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 260                         &current_fh->fh_handle);
 261
 262         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 263                 (open->op_iattr.ia_size == 0);
 264
 265         status = do_open_permission(rqstp, current_fh, open,
 266                                     NFSD_MAY_OWNER_OVERRIDE);
 267
 268         return status;
 269 }
 270
 271 static void
 272 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 273 {
 274         struct nfsd4_sessionid *sid =
 275                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 276
 277         clid->cl_boot = sid->clientid.cl_boot;
 278         clid->cl_id = sid->clientid.cl_id;
 279 }
 280
 281 static __be32
 282 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 283            struct nfsd4_open *open)
 284 {
 285         __be32 status;
 286         struct nfsd4_compoundres *resp;
 287
 288         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 289                 (int)open->op_fname.len, open->op_fname.data,
 290                 open->op_stateowner);
 291
 292         /* This check required by spec. */
 293         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 294                 return nfserr_inval;
 295
 296         if (nfsd4_has_session(cstate))
 297                 copy_clientid(&open->op_clientid, cstate->session);
 298
 299         nfs4_lock_state();
 300
 301         /* check seqid for replay. set nfs4_owner */
 302         resp = rqstp->rq_resp;
 303         status = nfsd4_process_open1(&resp->cstate, open);
 304         if (status == nfserr_replay_me) {
 305                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 306                 fh_put(&cstate->current_fh);
 307                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 308                                 &rp->rp_openfh);
 309                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 310                 if (status)
 311                         dprintk("nfsd4_open: replay failed"
 312                                 " restoring previous filehandle\n");
 313                 else
 314                         status = nfserr_replay_me;
 315         }
 316         if (status)
 317                 goto out;
 318
 319         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 320         if (status)
 321                 goto out;
 322
 323         /* Openowner is now set, so sequence id will get bumped.  Now we need
 324          * these checks before we do any creates: */
 325         status = nfserr_grace;
 326         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 327                 goto out;
 328         status = nfserr_no_grace;
 329         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 330                 goto out;
 331
 332         switch (open->op_claim_type) {
 333                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 334                 case NFS4_OPEN_CLAIM_NULL:
 335                         /*
 336                          * (1) set CURRENT_FH to the file being opened,
 337                          * creating it if necessary, (2) set open->op_cinfo,
 338                          * (3) set open->op_truncate if the file is to be
 339                          * truncated after opening, (4) do permission checking.
 340                          */
 341                         status = do_open_lookup(rqstp, &cstate->current_fh,
 342                                                 open);
 343                         if (status)
 344                                 goto out;
 345                         break;
 346                 case NFS4_OPEN_CLAIM_PREVIOUS:
 347                         open->op_stateowner->so_confirmed = 1;
 348                         /*
 349                          * The CURRENT_FH is already set to the file being
 350                          * opened.  (1) set open->op_cinfo, (2) set
 351                          * open->op_truncate if the file is to be truncated
 352                          * after opening, (3) do permission checking.
 353                         */
 354                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 355                                                  open);
 356                         if (status)
 357                                 goto out;
 358                         break;
 359                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 360                         open->op_stateowner->so_confirmed = 1;
 361                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 362                                 open->op_claim_type);
 363                         status = nfserr_notsupp;
 364                         goto out;
 365                 default:
 366                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 367                                 open->op_claim_type);
 368                         status = nfserr_inval;
 369                         goto out;
 370         }
 371         /*
 372          * nfsd4_process_open2() does the actual opening of the file.  If
 373          * successful, it (1) truncates the file if open->op_truncate was
 374          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 375          */
 376         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 377 out:
 378         if (open->op_stateowner) {
 379                 nfs4_get_stateowner(open->op_stateowner);
 380                 cstate->replay_owner = open->op_stateowner;
 381         }
 382         nfs4_unlock_state();
 383         return status;
 384 }
 385
 386 /*
 387  * filehandle-manipulating ops.
 388  */
 389 static __be32
 390 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 391             struct svc_fh **getfh)
 392 {
 393         if (!cstate->current_fh.fh_dentry)
 394                 return nfserr_nofilehandle;
 395
 396         *getfh = &cstate->current_fh;
 397         return nfs_ok;
 398 }
 399
 400 static __be32
 401 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 402             struct nfsd4_putfh *putfh)
 403 {
 404         fh_put(&cstate->current_fh);
 405         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 406         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 407                putfh->pf_fhlen);
 408         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 409 }
 410
 411 static __be32
 412 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 413                 void *arg)
 414 {
 415         __be32 status;
 416
 417         fh_put(&cstate->current_fh);
 418         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 419         return status;
 420 }
 421
 422 static __be32
 423 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 424                 void *arg)
 425 {
 426         if (!cstate->save_fh.fh_dentry)
 427                 return nfserr_restorefh;
 428
 429         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 430         return nfs_ok;
 431 }
 432
 433 static __be32
 434 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 435              void *arg)
 436 {
 437         if (!cstate->current_fh.fh_dentry)
 438                 return nfserr_nofilehandle;
 439
 440         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 441         return nfs_ok;
 442 }
 443
 444 /*
 445  * misc nfsv4 ops
 446  */
 447 static __be32
 448 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 449              struct nfsd4_access *access)
 450 {
 451         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 452                 return nfserr_inval;
 453
 454         access->ac_resp_access = access->ac_req_access;
 455         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 456                            &access->ac_supported);
 457 }
 458
 459 static __be32
 460 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 461              struct nfsd4_commit *commit)
 462 {
 463         __be32 status;
 464
 465         u32 *p = (u32 *)commit->co_verf.data;
 466         *p++ = nfssvc_boot.tv_sec;
 467         *p++ = nfssvc_boot.tv_usec;
 468
 469         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 470                              commit->co_count);
 471         if (status == nfserr_symlink)
 472                 status = nfserr_inval;
 473         return status;
 474 }
 475
 476 static __be32
 477 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 478              struct nfsd4_create *create)
 479 {
 480         struct svc_fh resfh;
 481         __be32 status;
 482         dev_t rdev;
 483
 484         fh_init(&resfh, NFS4_FHSIZE);
 485
 486         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 487                            NFSD_MAY_CREATE);
 488         if (status == nfserr_symlink)
 489                 status = nfserr_notdir;
 490         if (status)
 491                 return status;
 492
 493         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 494                                     nfsd_attrmask);
 495         if (status)
 496                 return status;
 497
 498         switch (create->cr_type) {
 499         case NF4LNK:
 500                 /* ugh! we have to null-terminate the linktext, or
 501                  * vfs_symlink() will choke.  it is always safe to
 502                  * null-terminate by brute force, since at worst we
 503                  * will overwrite the first byte of the create namelen
 504                  * in the XDR buffer, which has already been extracted
 505                  * during XDR decode.
 506                  */
 507                 create->cr_linkname[create->cr_linklen] = 0;
 508
 509                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 510                                       create->cr_name, create->cr_namelen,
 511                                       create->cr_linkname, create->cr_linklen,
 512                                       &resfh, &create->cr_iattr);
 513                 break;
 514
 515         case NF4BLK:
 516                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 517                 if (MAJOR(rdev) != create->cr_specdata1 ||
 518                     MINOR(rdev) != create->cr_specdata2)
 519                         return nfserr_inval;
 520                 status = nfsd_create(rqstp, &cstate->current_fh,
 521                                      create->cr_name, create->cr_namelen,
 522                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 523                 break;
 524
 525         case NF4CHR:
 526                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 527                 if (MAJOR(rdev) != create->cr_specdata1 ||
 528                     MINOR(rdev) != create->cr_specdata2)
 529                         return nfserr_inval;
 530                 status = nfsd_create(rqstp, &cstate->current_fh,
 531                                      create->cr_name, create->cr_namelen,
 532                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 533                 break;
 534
 535         case NF4SOCK:
 536                 status = nfsd_create(rqstp, &cstate->current_fh,
 537                                      create->cr_name, create->cr_namelen,
 538                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 539                 break;
 540
 541         case NF4FIFO:
 542                 status = nfsd_create(rqstp, &cstate->current_fh,
 543                                      create->cr_name, create->cr_namelen,
 544                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 545                 break;
 546
 547         case NF4DIR:
 548                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 549                 status = nfsd_create(rqstp, &cstate->current_fh,
 550                                      create->cr_name, create->cr_namelen,
 551                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 552                 break;
 553
 554         default:
 555                 status = nfserr_badtype;
 556         }
 557
 558         if (status)
 559                 goto out;
 560
 561         if (create->cr_acl != NULL)
 562                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 563                                 create->cr_bmval);
 564
 565         fh_unlock(&cstate->current_fh);
 566         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 567         fh_dup2(&cstate->current_fh, &resfh);
 568 out:
 569         fh_put(&resfh);
 570         return status;
 571 }
 572
 573 static __be32
 574 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 575               struct nfsd4_getattr *getattr)
 576 {
 577         __be32 status;
 578
 579         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 580         if (status)
 581                 return status;
 582
 583         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 584                 return nfserr_inval;
 585
 586         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 587         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 588         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 589
 590         getattr->ga_fhp = &cstate->current_fh;
 591         return nfs_ok;
 592 }
 593
 594 static __be32
 595 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 596            struct nfsd4_link *link)
 597 {
 598         __be32 status = nfserr_nofilehandle;
 599
 600         if (!cstate->save_fh.fh_dentry)
 601                 return status;
 602         status = nfsd_link(rqstp, &cstate->current_fh,
 603                            link->li_name, link->li_namelen, &cstate->save_fh);
 604         if (!status)
 605                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 606         return status;
 607 }
 608
 609 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 610 {
 611         struct svc_fh tmp_fh;
 612         __be32 ret;
 613
 614         fh_init(&tmp_fh, NFS4_FHSIZE);
 615         ret = exp_pseudoroot(rqstp, &tmp_fh);
 616         if (ret)
 617                 return ret;
 618         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 619                 fh_put(&tmp_fh);
 620                 return nfserr_noent;
 621         }
 622         fh_put(&tmp_fh);
 623         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 624 }
 625
 626 static __be32
 627 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 628               void *arg)
 629 {
 630         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 631 }
 632
 633 static __be32
 634 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 635              struct nfsd4_lookup *lookup)
 636 {
 637         return nfsd_lookup(rqstp, &cstate->current_fh,
 638                            lookup->lo_name, lookup->lo_len,
 639                            &cstate->current_fh);
 640 }
 641
 642 static __be32
 643 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 644            struct nfsd4_read *read)
 645 {
 646         __be32 status;
 647
 648         /* no need to check permission - this will be done in nfsd_read() */
 649
 650         read->rd_filp = NULL;
 651         if (read->rd_offset >= OFFSET_MAX)
 652                 return nfserr_inval;
 653
 654         nfs4_lock_state();
 655         /* check stateid */
 656         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 657                                                  RD_STATE, &read->rd_filp))) {
 658                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 659                 goto out;
 660         }
 661         if (read->rd_filp)
 662                 get_file(read->rd_filp);
 663         status = nfs_ok;
 664 out:
 665         nfs4_unlock_state();
 666         read->rd_rqstp = rqstp;
 667         read->rd_fhp = &cstate->current_fh;
 668         return status;
 669 }
 670
 671 static __be32
 672 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 673               struct nfsd4_readdir *readdir)
 674 {
 675         u64 cookie = readdir->rd_cookie;
 676         static const nfs4_verifier zeroverf;
 677
 678         /* no need to check permission - this will be done in nfsd_readdir() */
 679
 680         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 681                 return nfserr_inval;
 682
 683         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 684         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 685         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 686
 687         if ((cookie == 1) || (cookie == 2) ||
 688             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 689                 return nfserr_bad_cookie;
 690
 691         readdir->rd_rqstp = rqstp;
 692         readdir->rd_fhp = &cstate->current_fh;
 693         return nfs_ok;
 694 }
 695
 696 static __be32
 697 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 698                struct nfsd4_readlink *readlink)
 699 {
 700         readlink->rl_rqstp = rqstp;
 701         readlink->rl_fhp = &cstate->current_fh;
 702         return nfs_ok;
 703 }
 704
 705 static __be32
 706 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 707              struct nfsd4_remove *remove)
 708 {
 709         __be32 status;
 710
 711         if (locks_in_grace())
 712                 return nfserr_grace;
 713         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 714                              remove->rm_name, remove->rm_namelen);
 715         if (status == nfserr_symlink)
 716                 return nfserr_notdir;
 717         if (!status) {
 718                 fh_unlock(&cstate->current_fh);
 719                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 720         }
 721         return status;
 722 }
 723
 724 static __be32
 725 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 726              struct nfsd4_rename *rename)
 727 {
 728         __be32 status = nfserr_nofilehandle;
 729
 730         if (!cstate->save_fh.fh_dentry)
 731                 return status;
 732         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 733                                         & NFSEXP_NOSUBTREECHECK))
 734                 return nfserr_grace;
 735         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 736                              rename->rn_snamelen, &cstate->current_fh,
 737                              rename->rn_tname, rename->rn_tnamelen);
 738
 739         /* the underlying filesystem returns different error's than required
 740          * by NFSv4. both save_fh and current_fh have been verified.. */
 741         if (status == nfserr_isdir)
 742                 status = nfserr_exist;
 743         else if ((status == nfserr_notdir) &&
 744                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 745                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 746                 status = nfserr_exist;
 747         else if (status == nfserr_symlink)
 748                 status = nfserr_notdir;
 749
 750         if (!status) {
 751                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 752                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 753         }
 754         return status;
 755 }
 756
 757 static __be32
 758 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 759               struct nfsd4_secinfo *secinfo)
 760 {
 761         struct svc_fh resfh;
 762         struct svc_export *exp;
 763         struct dentry *dentry;
 764         __be32 err;
 765
 766         fh_init(&resfh, NFS4_FHSIZE);
 767         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 768         if (err)
 769                 return err;
 770         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 771                                     secinfo->si_name, secinfo->si_namelen,
 772                                     &exp, &dentry);
 773         if (err)
 774                 return err;
 775         if (dentry->d_inode == NULL) {
 776                 exp_put(exp);
 777                 err = nfserr_noent;
 778         } else
 779                 secinfo->si_exp = exp;
 780         dput(dentry);
 781         if (cstate->minorversion)
 782                 /* See rfc 5661 section 2.6.3.1.1.8 */
 783                 fh_put(&cstate->current_fh);
 784         return err;
 785 }
 786
 787 static __be32
 788 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 789               struct nfsd4_secinfo_no_name *sin)
 790 {
 791         __be32 err;
 792
 793         switch (sin->sin_style) {
 794         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 795                 break;
 796         case NFS4_SECINFO_STYLE4_PARENT:
 797                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 798                 if (err)
 799                         return err;
 800                 break;
 801         default:
 802                 return nfserr_inval;
 803         }
 804         exp_get(cstate->current_fh.fh_export);
 805         sin->sin_exp = cstate->current_fh.fh_export;
 806         fh_put(&cstate->current_fh);
 807         return nfs_ok;
 808 }
 809
 810 static __be32
 811 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 812               struct nfsd4_setattr *setattr)
 813 {
 814         __be32 status = nfs_ok;
 815
 816         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 817                 nfs4_lock_state();
 818                 status = nfs4_preprocess_stateid_op(cstate,
 819                         &setattr->sa_stateid, WR_STATE, NULL);
 820                 nfs4_unlock_state();
 821                 if (status) {
 822                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 823                         return status;
 824                 }
 825         }
 826         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 827         if (status)
 828                 return status;
 829         status = nfs_ok;
 830
 831         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 832                                     nfsd_attrmask);
 833         if (status)
 834                 goto out;
 835
 836         if (setattr->sa_acl != NULL)
 837                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 838                                             setattr->sa_acl);
 839         if (status)
 840                 goto out;
 841         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 842                                 0, (time_t)0);
 843 out:
 844         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 845         return status;
 846 }
 847
 848 static __be32
 849 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 850             struct nfsd4_write *write)
 851 {
 852         stateid_t *stateid = &write->wr_stateid;
 853         struct file *filp = NULL;
 854         u32 *p;
 855         __be32 status = nfs_ok;
 856         unsigned long cnt;
 857
 858         /* no need to check permission - this will be done in nfsd_write() */
 859
 860         if (write->wr_offset >= OFFSET_MAX)
 861                 return nfserr_inval;
 862
 863         nfs4_lock_state();
 864         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 865         if (filp)
 866                 get_file(filp);
 867         nfs4_unlock_state();
 868
 869         if (status) {
 870                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 871                 return status;
 872         }
 873
 874         cnt = write->wr_buflen;
 875         write->wr_how_written = write->wr_stable_how;
 876         p = (u32 *)write->wr_verifier.data;
 877         *p++ = nfssvc_boot.tv_sec;
 878         *p++ = nfssvc_boot.tv_usec;
 879
 880         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 881                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 882                              &cnt, &write->wr_how_written);
 883         if (filp)
 884                 fput(filp);
 885
 886         write->wr_bytes_written = cnt;
 887
 888         if (status == nfserr_symlink)
 889                 status = nfserr_inval;
 890         return status;
 891 }
 892
 893 /* This routine never returns NFS_OK!  If there are no other errors, it
 894  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 895  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 896  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 897  */
 898 static __be32
 899 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 900              struct nfsd4_verify *verify)
 901 {
 902         __be32 *buf, *p;
 903         int count;
 904         __be32 status;
 905
 906         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 907         if (status)
 908                 return status;
 909
 910         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 911         if (status)
 912                 return status;
 913
 914         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 915             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 916                 return nfserr_inval;
 917         if (verify->ve_attrlen & 3)
 918                 return nfserr_inval;
 919
 920         /* count in words:
 921          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 922          */
 923         count = 4 + (verify->ve_attrlen >> 2);
 924         buf = kmalloc(count << 2, GFP_KERNEL);
 925         if (!buf)
 926                 return nfserr_jukebox;
 927
 928         status = nfsd4_encode_fattr(&cstate->current_fh,
 929                                     cstate->current_fh.fh_export,
 930                                     cstate->current_fh.fh_dentry, buf,
 931                                     &count, verify->ve_bmval,
 932                                     rqstp, 0);
 933
 934         /* this means that nfsd4_encode_fattr() ran out of space */
 935         if (status == nfserr_resource && count == 0)
 936                 status = nfserr_not_same;
 937         if (status)
 938                 goto out_kfree;
 939
 940         /* skip bitmap */
 941         p = buf + 1 + ntohl(buf[0]);
 942         status = nfserr_not_same;
 943         if (ntohl(*p++) != verify->ve_attrlen)
 944                 goto out_kfree;
 945         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 946                 status = nfserr_same;
 947
 948 out_kfree:
 949         kfree(buf);
 950         return status;
 951 }
 952
 953 static __be32
 954 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 955               struct nfsd4_verify *verify)
 956 {
 957         __be32 status;
 958
 959         status = _nfsd4_verify(rqstp, cstate, verify);
 960         return status == nfserr_not_same ? nfs_ok : status;
 961 }
 962
 963 static __be32
 964 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 965              struct nfsd4_verify *verify)
 966 {
 967         __be32 status;
 968
 969         status = _nfsd4_verify(rqstp, cstate, verify);
 970         return status == nfserr_same ? nfs_ok : status;
 971 }
 972
 973 /*
 974  * NULL call.
 975  */
 976 static __be32
 977 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 978 {
 979         return nfs_ok;
 980 }
 981
 982 static inline void nfsd4_increment_op_stats(u32 opnum)
 983 {
 984         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 985                 nfsdstats.nfs4_opcount[opnum]++;
 986 }
 987
 988 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 989                               void *);
 990 enum nfsd4_op_flags {
 991         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 992         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
 993         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
 994         /* For rfc 5661 section 2.6.3.1.1: */
 995         OP_HANDLES_WRONGSEC = 1 << 3,
 996         OP_IS_PUTFH_LIKE = 1 << 4,
 997 };
 998
 999 struct nfsd4_operation {
1000         nfsd4op_func op_func;
1001         u32 op_flags;
1002         char *op_name;
1003 };
1004
1005 static struct nfsd4_operation nfsd4_ops[];
1006
1007 static const char *nfsd4_op_name(unsigned opnum);
1008
1009 /*
1010  * Enforce NFSv4.1 COMPOUND ordering rules:
1011  *
1012  * Also note, enforced elsewhere:
1013  *      - SEQUENCE other than as first op results in
1014  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1015  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1016  *        (Enforced in nfsd4_bind_conn_to_session().)
1017  *      - DESTROY_SESSION must be the final operation in a compound, if
1018  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1019  *        (Enforced in nfsd4_destroy_session().)
1020  */
1021 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1022 {
1023         struct nfsd4_op *op = &args->ops[0];
1024
1025         /* These ordering requirements don't apply to NFSv4.0: */
1026         if (args->minorversion == 0)
1027                 return nfs_ok;
1028         /* This is weird, but OK, not our problem: */
1029         if (args->opcnt == 0)
1030                 return nfs_ok;
1031         if (op->status == nfserr_op_illegal)
1032                 return nfs_ok;
1033         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1034                 return nfserr_op_not_in_session;
1035         if (op->opnum == OP_SEQUENCE)
1036                 return nfs_ok;
1037         if (args->opcnt != 1)
1038                 return nfserr_not_only_op;
1039         return nfs_ok;
1040 }
1041
1042 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1043 {
1044         return &nfsd4_ops[op->opnum];
1045 }
1046
1047 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1048 {
1049         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1050         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1051         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1052         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1053         struct nfsd4_operation *thisd;
1054         struct nfsd4_operation *nextd;
1055
1056         thisd = OPDESC(this);
1057         /*
1058          * Most ops check wronsec on our own; only the putfh-like ops
1059          * have special rules.
1060          */
1061         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1062                 return false;
1063         /*
1064          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1065          * put-filehandle operation if we're not going to use the
1066          * result:
1067          */
1068         if (argp->opcnt == resp->opcnt)
1069                 return false;
1070
1071         nextd = OPDESC(next);
1072         /*
1073          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1074          * errors themselves as necessary; others should check for them
1075          * now:
1076          */
1077         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1078 }
1079
1080 /*
1081  * COMPOUND call.
1082  */
1083 static __be32
1084 nfsd4_proc_compound(struct svc_rqst *rqstp,
1085                     struct nfsd4_compoundargs *args,
1086                     struct nfsd4_compoundres *resp)
1087 {
1088         struct nfsd4_op *op;
1089         struct nfsd4_operation *opdesc;
1090         struct nfsd4_compound_state *cstate = &resp->cstate;
1091         int             slack_bytes;
1092         __be32          status;
1093
1094         resp->xbuf = &rqstp->rq_res;
1095         resp->p = rqstp->rq_res.head[0].iov_base +
1096                                                 rqstp->rq_res.head[0].iov_len;
1097         resp->tagp = resp->p;
1098         /* reserve space for: taglen, tag, and opcnt */
1099         resp->p += 2 + XDR_QUADLEN(args->taglen);
1100         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1101         resp->taglen = args->taglen;
1102         resp->tag = args->tag;
1103         resp->opcnt = 0;
1104         resp->rqstp = rqstp;
1105         resp->cstate.minorversion = args->minorversion;
1106         resp->cstate.replay_owner = NULL;
1107         resp->cstate.session = NULL;
1108         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1109         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1110         /*
1111          * Don't use the deferral mechanism for NFSv4; compounds make it
1112          * too hard to avoid non-idempotency problems.
1113          */
1114         rqstp->rq_usedeferral = 0;
1115
1116         /*
1117          * According to RFC3010, this takes precedence over all other errors.
1118          */
1119         status = nfserr_minor_vers_mismatch;
1120         if (args->minorversion > nfsd_supported_minorversion)
1121                 goto out;
1122
1123         status = nfs41_check_op_ordering(args);
1124         if (status) {
1125                 op = &args->ops[0];
1126                 op->status = status;
1127                 goto encode_op;
1128         }
1129
1130         while (!status && resp->opcnt < args->opcnt) {
1131                 op = &args->ops[resp->opcnt++];
1132
1133                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1134                         resp->opcnt, args->opcnt, op->opnum,
1135                         nfsd4_op_name(op->opnum));
1136                 /*
1137                  * The XDR decode routines may have pre-set op->status;
1138                  * for example, if there is a miscellaneous XDR error
1139                  * it will be set to nfserr_bad_xdr.
1140                  */
1141                 if (op->status)
1142                         goto encode_op;
1143
1144                 /* We must be able to encode a successful response to
1145                  * this operation, with enough room left over to encode a
1146                  * failed response to the next operation.  If we don't
1147                  * have enough room, fail with ERR_RESOURCE.
1148                  */
1149                 slack_bytes = (char *)resp->end - (char *)resp->p;
1150                 if (slack_bytes < COMPOUND_SLACK_SPACE
1151                                 + COMPOUND_ERR_SLACK_SPACE) {
1152                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1153                         op->status = nfserr_resource;
1154                         goto encode_op;
1155                 }
1156
1157                 opdesc = OPDESC(op);
1158
1159                 if (!cstate->current_fh.fh_dentry) {
1160                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1161                                 op->status = nfserr_nofilehandle;
1162                                 goto encode_op;
1163                         }
1164                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1165                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1166                         op->status = nfserr_moved;
1167                         goto encode_op;
1168                 }
1169
1170                 if (opdesc->op_func)
1171                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1172                 else
1173                         BUG_ON(op->status == nfs_ok);
1174
1175                 if (!op->status && need_wrongsec_check(rqstp))
1176                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1177
1178 encode_op:
1179                 /* Only from SEQUENCE */
1180                 if (resp->cstate.status == nfserr_replay_cache) {
1181                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1182                         status = op->status;
1183                         goto out;
1184                 }
1185                 if (op->status == nfserr_replay_me) {
1186                         op->replay = &cstate->replay_owner->so_replay;
1187                         nfsd4_encode_replay(resp, op);
1188                         status = op->status = op->replay->rp_status;
1189                 } else {
1190                         nfsd4_encode_operation(resp, op);
1191                         status = op->status;
1192                 }
1193
1194                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1195                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1196                         be32_to_cpu(status));
1197
1198                 if (cstate->replay_owner) {
1199                         nfs4_put_stateowner(cstate->replay_owner);
1200                         cstate->replay_owner = NULL;
1201                 }
1202                 /* XXX Ugh, we need to get rid of this kind of special case: */
1203                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1204                         fput(op->u.read.rd_filp);
1205
1206                 nfsd4_increment_op_stats(op->opnum);
1207         }
1208
1209         resp->cstate.status = status;
1210         fh_put(&resp->cstate.current_fh);
1211         fh_put(&resp->cstate.save_fh);
1212         BUG_ON(resp->cstate.replay_owner);
1213 out:
1214         nfsd4_release_compoundargs(args);
1215         /* Reset deferral mechanism for RPC deferrals */
1216         rqstp->rq_usedeferral = 1;
1217         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1218         return status;
1219 }
1220
1221 static struct nfsd4_operation nfsd4_ops[] = {
1222         [OP_ACCESS] = {
1223                 .op_func = (nfsd4op_func)nfsd4_access,
1224                 .op_name = "OP_ACCESS",
1225         },
1226         [OP_CLOSE] = {
1227                 .op_func = (nfsd4op_func)nfsd4_close,
1228                 .op_name = "OP_CLOSE",
1229         },
1230         [OP_COMMIT] = {
1231                 .op_func = (nfsd4op_func)nfsd4_commit,
1232                 .op_name = "OP_COMMIT",
1233         },
1234         [OP_CREATE] = {
1235                 .op_func = (nfsd4op_func)nfsd4_create,
1236                 .op_name = "OP_CREATE",
1237         },
1238         [OP_DELEGRETURN] = {
1239                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1240                 .op_name = "OP_DELEGRETURN",
1241         },
1242         [OP_GETATTR] = {
1243                 .op_func = (nfsd4op_func)nfsd4_getattr,
1244                 .op_flags = ALLOWED_ON_ABSENT_FS,
1245                 .op_name = "OP_GETATTR",
1246         },
1247         [OP_GETFH] = {
1248                 .op_func = (nfsd4op_func)nfsd4_getfh,
1249                 .op_name = "OP_GETFH",
1250         },
1251         [OP_LINK] = {
1252                 .op_func = (nfsd4op_func)nfsd4_link,
1253                 .op_name = "OP_LINK",
1254         },
1255         [OP_LOCK] = {
1256                 .op_func = (nfsd4op_func)nfsd4_lock,
1257                 .op_name = "OP_LOCK",
1258         },
1259         [OP_LOCKT] = {
1260                 .op_func = (nfsd4op_func)nfsd4_lockt,
1261                 .op_name = "OP_LOCKT",
1262         },
1263         [OP_LOCKU] = {
1264                 .op_func = (nfsd4op_func)nfsd4_locku,
1265                 .op_name = "OP_LOCKU",
1266         },
1267         [OP_LOOKUP] = {
1268                 .op_func = (nfsd4op_func)nfsd4_lookup,
1269                 .op_flags = OP_HANDLES_WRONGSEC,
1270                 .op_name = "OP_LOOKUP",
1271         },
1272         [OP_LOOKUPP] = {
1273                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1274                 .op_flags = OP_HANDLES_WRONGSEC,
1275                 .op_name = "OP_LOOKUPP",
1276         },
1277         [OP_NVERIFY] = {
1278                 .op_func = (nfsd4op_func)nfsd4_nverify,
1279                 .op_name = "OP_NVERIFY",
1280         },
1281         [OP_OPEN] = {
1282                 .op_func = (nfsd4op_func)nfsd4_open,
1283                 .op_flags = OP_HANDLES_WRONGSEC,
1284                 .op_name = "OP_OPEN",
1285         },
1286         [OP_OPEN_CONFIRM] = {
1287                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1288                 .op_name = "OP_OPEN_CONFIRM",
1289         },
1290         [OP_OPEN_DOWNGRADE] = {
1291                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1292                 .op_name = "OP_OPEN_DOWNGRADE",
1293         },
1294         [OP_PUTFH] = {
1295                 .op_func = (nfsd4op_func)nfsd4_putfh,
1296                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1297                                 | OP_IS_PUTFH_LIKE,
1298                 .op_name = "OP_PUTFH",
1299         },
1300         [OP_PUTPUBFH] = {
1301                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1302                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1303                                 | OP_IS_PUTFH_LIKE,
1304                 .op_name = "OP_PUTPUBFH",
1305         },
1306         [OP_PUTROOTFH] = {
1307                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1308                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1309                                 | OP_IS_PUTFH_LIKE,
1310                 .op_name = "OP_PUTROOTFH",
1311         },
1312         [OP_READ] = {
1313                 .op_func = (nfsd4op_func)nfsd4_read,
1314                 .op_name = "OP_READ",
1315         },
1316         [OP_READDIR] = {
1317                 .op_func = (nfsd4op_func)nfsd4_readdir,
1318                 .op_name = "OP_READDIR",
1319         },
1320         [OP_READLINK] = {
1321                 .op_func = (nfsd4op_func)nfsd4_readlink,
1322                 .op_name = "OP_READLINK",
1323         },
1324         [OP_REMOVE] = {
1325                 .op_func = (nfsd4op_func)nfsd4_remove,
1326                 .op_name = "OP_REMOVE",
1327         },
1328         [OP_RENAME] = {
1329                 .op_name = "OP_RENAME",
1330                 .op_func = (nfsd4op_func)nfsd4_rename,
1331         },
1332         [OP_RENEW] = {
1333                 .op_func = (nfsd4op_func)nfsd4_renew,
1334                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1335                 .op_name = "OP_RENEW",
1336         },
1337         [OP_RESTOREFH] = {
1338                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1339                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1340                                 | OP_IS_PUTFH_LIKE,
1341                 .op_name = "OP_RESTOREFH",
1342         },
1343         [OP_SAVEFH] = {
1344                 .op_func = (nfsd4op_func)nfsd4_savefh,
1345                 .op_flags = OP_HANDLES_WRONGSEC,
1346                 .op_name = "OP_SAVEFH",
1347         },
1348         [OP_SECINFO] = {
1349                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1350                 .op_flags = OP_HANDLES_WRONGSEC,
1351                 .op_name = "OP_SECINFO",
1352         },
1353         [OP_SETATTR] = {
1354                 .op_func = (nfsd4op_func)nfsd4_setattr,
1355                 .op_name = "OP_SETATTR",
1356         },
1357         [OP_SETCLIENTID] = {
1358                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1359                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1360                 .op_name = "OP_SETCLIENTID",
1361         },
1362         [OP_SETCLIENTID_CONFIRM] = {
1363                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1364                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1365                 .op_name = "OP_SETCLIENTID_CONFIRM",
1366         },
1367         [OP_VERIFY] = {
1368                 .op_func = (nfsd4op_func)nfsd4_verify,
1369                 .op_name = "OP_VERIFY",
1370         },
1371         [OP_WRITE] = {
1372                 .op_func = (nfsd4op_func)nfsd4_write,
1373                 .op_name = "OP_WRITE",
1374         },
1375         [OP_RELEASE_LOCKOWNER] = {
1376                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1377                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1378                 .op_name = "OP_RELEASE_LOCKOWNER",
1379         },
1380
1381         /* NFSv4.1 operations */
1382         [OP_EXCHANGE_ID] = {
1383                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1384                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1385                 .op_name = "OP_EXCHANGE_ID",
1386         },
1387         [OP_BIND_CONN_TO_SESSION] = {
1388                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1389                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1390                 .op_name = "OP_BIND_CONN_TO_SESSION",
1391         },
1392         [OP_CREATE_SESSION] = {
1393                 .op_func = (nfsd4op_func)nfsd4_create_session,
1394                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1395                 .op_name = "OP_CREATE_SESSION",
1396         },
1397         [OP_DESTROY_SESSION] = {
1398                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1399                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1400                 .op_name = "OP_DESTROY_SESSION",
1401         },
1402         [OP_SEQUENCE] = {
1403                 .op_func = (nfsd4op_func)nfsd4_sequence,
1404                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1405                 .op_name = "OP_SEQUENCE",
1406         },
1407         [OP_RECLAIM_COMPLETE] = {
1408                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1409                 .op_flags = ALLOWED_WITHOUT_FH,
1410                 .op_name = "OP_RECLAIM_COMPLETE",
1411         },
1412         [OP_SECINFO_NO_NAME] = {
1413                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1414                 .op_flags = OP_HANDLES_WRONGSEC,
1415                 .op_name = "OP_SECINFO_NO_NAME",
1416         },
1417 };
1418
1419 static const char *nfsd4_op_name(unsigned opnum)
1420 {
1421         if (opnum < ARRAY_SIZE(nfsd4_ops))
1422                 return nfsd4_ops[opnum].op_name;
1423         return "unknown_operation";
1424 }
1425
1426 #define nfsd4_voidres                   nfsd4_voidargs
1427 struct nfsd4_voidargs { int dummy; };
1428
1429 /*
1430  * TODO: At the present time, the NFSv4 server does not do XID caching
1431  * of requests.  Implementing XID caching would not be a serious problem,
1432  * although it would require a mild change in interfaces since one
1433  * doesn't know whether an NFSv4 request is idempotent until after the
1434  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1435  * Astrand's regression testsuite for NFSv4 servers), which reuses
1436  * XID's liberally, so I've left it unimplemented until pynfs generates
1437  * better XID's.
1438  */
1439 static struct svc_procedure             nfsd_procedures4[2] = {
1440         [NFSPROC4_NULL] = {
1441                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1442                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1443                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1444                 .pc_ressize = sizeof(struct nfsd4_voidres),
1445                 .pc_cachetype = RC_NOCACHE,
1446                 .pc_xdrressize = 1,
1447         },
1448         [NFSPROC4_COMPOUND] = {
1449                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1450                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1451                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1452                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1453                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1454                 .pc_cachetype = RC_NOCACHE,
1455                 .pc_xdrressize = NFSD_BUFSIZE/4,
1456         },
1457 };
1458
1459 struct svc_version      nfsd_version4 = {
1460                 .vs_vers        = 4,
1461                 .vs_nproc       = 2,
1462                 .vs_proc        = nfsd_procedures4,
1463                 .vs_dispatch    = nfsd_dispatch,
1464                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1465 };
1466
1467 /*
1468  * Local variables:
1469  *  c-basic-offset: 8
1470  * End:
1471  */