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         /*
 295          * RFC5661 18.51.3
 296          * Before RECLAIM_COMPLETE done, server should deny new lock
 297          */
 298         if (nfsd4_has_session(cstate) &&
 299             !cstate->session->se_client->cl_firststate &&
 300             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 301                 return nfserr_grace;
 302
 303         if (nfsd4_has_session(cstate))
 304                 copy_clientid(&open->op_clientid, cstate->session);
 305
 306         nfs4_lock_state();
 307
 308         /* check seqid for replay. set nfs4_owner */
 309         resp = rqstp->rq_resp;
 310         status = nfsd4_process_open1(&resp->cstate, open);
 311         if (status == nfserr_replay_me) {
 312                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 313                 fh_put(&cstate->current_fh);
 314                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 315                                 &rp->rp_openfh);
 316                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 317                 if (status)
 318                         dprintk("nfsd4_open: replay failed"
 319                                 " restoring previous filehandle\n");
 320                 else
 321                         status = nfserr_replay_me;
 322         }
 323         if (status)
 324                 goto out;
 325
 326         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 327         if (status)
 328                 goto out;
 329
 330         /* Openowner is now set, so sequence id will get bumped.  Now we need
 331          * these checks before we do any creates: */
 332         status = nfserr_grace;
 333         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 334                 goto out;
 335         status = nfserr_no_grace;
 336         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 337                 goto out;
 338
 339         switch (open->op_claim_type) {
 340                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 341                 case NFS4_OPEN_CLAIM_NULL:
 342                         /*
 343                          * (1) set CURRENT_FH to the file being opened,
 344                          * creating it if necessary, (2) set open->op_cinfo,
 345                          * (3) set open->op_truncate if the file is to be
 346                          * truncated after opening, (4) do permission checking.
 347                          */
 348                         status = do_open_lookup(rqstp, &cstate->current_fh,
 349                                                 open);
 350                         if (status)
 351                                 goto out;
 352                         break;
 353                 case NFS4_OPEN_CLAIM_PREVIOUS:
 354                         open->op_stateowner->so_confirmed = 1;
 355                         /*
 356                          * The CURRENT_FH is already set to the file being
 357                          * opened.  (1) set open->op_cinfo, (2) set
 358                          * open->op_truncate if the file is to be truncated
 359                          * after opening, (3) do permission checking.
 360                         */
 361                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 362                                                  open);
 363                         if (status)
 364                                 goto out;
 365                         break;
 366                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 367                         open->op_stateowner->so_confirmed = 1;
 368                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 369                                 open->op_claim_type);
 370                         status = nfserr_notsupp;
 371                         goto out;
 372                 default:
 373                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 374                                 open->op_claim_type);
 375                         status = nfserr_inval;
 376                         goto out;
 377         }
 378         /*
 379          * nfsd4_process_open2() does the actual opening of the file.  If
 380          * successful, it (1) truncates the file if open->op_truncate was
 381          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 382          */
 383         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 384 out:
 385         if (open->op_stateowner) {
 386                 nfs4_get_stateowner(open->op_stateowner);
 387                 cstate->replay_owner = open->op_stateowner;
 388         }
 389         nfs4_unlock_state();
 390         return status;
 391 }
 392
 393 /*
 394  * filehandle-manipulating ops.
 395  */
 396 static __be32
 397 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 398             struct svc_fh **getfh)
 399 {
 400         if (!cstate->current_fh.fh_dentry)
 401                 return nfserr_nofilehandle;
 402
 403         *getfh = &cstate->current_fh;
 404         return nfs_ok;
 405 }
 406
 407 static __be32
 408 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 409             struct nfsd4_putfh *putfh)
 410 {
 411         fh_put(&cstate->current_fh);
 412         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 413         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 414                putfh->pf_fhlen);
 415         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 416 }
 417
 418 static __be32
 419 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 420                 void *arg)
 421 {
 422         __be32 status;
 423
 424         fh_put(&cstate->current_fh);
 425         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 426         return status;
 427 }
 428
 429 static __be32
 430 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 431                 void *arg)
 432 {
 433         if (!cstate->save_fh.fh_dentry)
 434                 return nfserr_restorefh;
 435
 436         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 437         return nfs_ok;
 438 }
 439
 440 static __be32
 441 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 442              void *arg)
 443 {
 444         if (!cstate->current_fh.fh_dentry)
 445                 return nfserr_nofilehandle;
 446
 447         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 448         return nfs_ok;
 449 }
 450
 451 /*
 452  * misc nfsv4 ops
 453  */
 454 static __be32
 455 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 456              struct nfsd4_access *access)
 457 {
 458         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 459                 return nfserr_inval;
 460
 461         access->ac_resp_access = access->ac_req_access;
 462         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 463                            &access->ac_supported);
 464 }
 465
 466 static __be32
 467 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 468              struct nfsd4_commit *commit)
 469 {
 470         __be32 status;
 471
 472         u32 *p = (u32 *)commit->co_verf.data;
 473         *p++ = nfssvc_boot.tv_sec;
 474         *p++ = nfssvc_boot.tv_usec;
 475
 476         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 477                              commit->co_count);
 478         if (status == nfserr_symlink)
 479                 status = nfserr_inval;
 480         return status;
 481 }
 482
 483 static __be32
 484 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 485              struct nfsd4_create *create)
 486 {
 487         struct svc_fh resfh;
 488         __be32 status;
 489         dev_t rdev;
 490
 491         fh_init(&resfh, NFS4_FHSIZE);
 492
 493         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 494                            NFSD_MAY_CREATE);
 495         if (status == nfserr_symlink)
 496                 status = nfserr_notdir;
 497         if (status)
 498                 return status;
 499
 500         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 501                                     nfsd_attrmask);
 502         if (status)
 503                 return status;
 504
 505         switch (create->cr_type) {
 506         case NF4LNK:
 507                 /* ugh! we have to null-terminate the linktext, or
 508                  * vfs_symlink() will choke.  it is always safe to
 509                  * null-terminate by brute force, since at worst we
 510                  * will overwrite the first byte of the create namelen
 511                  * in the XDR buffer, which has already been extracted
 512                  * during XDR decode.
 513                  */
 514                 create->cr_linkname[create->cr_linklen] = 0;
 515
 516                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 517                                       create->cr_name, create->cr_namelen,
 518                                       create->cr_linkname, create->cr_linklen,
 519                                       &resfh, &create->cr_iattr);
 520                 break;
 521
 522         case NF4BLK:
 523                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 524                 if (MAJOR(rdev) != create->cr_specdata1 ||
 525                     MINOR(rdev) != create->cr_specdata2)
 526                         return nfserr_inval;
 527                 status = nfsd_create(rqstp, &cstate->current_fh,
 528                                      create->cr_name, create->cr_namelen,
 529                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 530                 break;
 531
 532         case NF4CHR:
 533                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 534                 if (MAJOR(rdev) != create->cr_specdata1 ||
 535                     MINOR(rdev) != create->cr_specdata2)
 536                         return nfserr_inval;
 537                 status = nfsd_create(rqstp, &cstate->current_fh,
 538                                      create->cr_name, create->cr_namelen,
 539                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 540                 break;
 541
 542         case NF4SOCK:
 543                 status = nfsd_create(rqstp, &cstate->current_fh,
 544                                      create->cr_name, create->cr_namelen,
 545                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 546                 break;
 547
 548         case NF4FIFO:
 549                 status = nfsd_create(rqstp, &cstate->current_fh,
 550                                      create->cr_name, create->cr_namelen,
 551                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 552                 break;
 553
 554         case NF4DIR:
 555                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 556                 status = nfsd_create(rqstp, &cstate->current_fh,
 557                                      create->cr_name, create->cr_namelen,
 558                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 559                 break;
 560
 561         default:
 562                 status = nfserr_badtype;
 563         }
 564
 565         if (status)
 566                 goto out;
 567
 568         if (create->cr_acl != NULL)
 569                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 570                                 create->cr_bmval);
 571
 572         fh_unlock(&cstate->current_fh);
 573         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 574         fh_dup2(&cstate->current_fh, &resfh);
 575 out:
 576         fh_put(&resfh);
 577         return status;
 578 }
 579
 580 static __be32
 581 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 582               struct nfsd4_getattr *getattr)
 583 {
 584         __be32 status;
 585
 586         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 587         if (status)
 588                 return status;
 589
 590         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 591                 return nfserr_inval;
 592
 593         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 594         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 595         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 596
 597         getattr->ga_fhp = &cstate->current_fh;
 598         return nfs_ok;
 599 }
 600
 601 static __be32
 602 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 603            struct nfsd4_link *link)
 604 {
 605         __be32 status = nfserr_nofilehandle;
 606
 607         if (!cstate->save_fh.fh_dentry)
 608                 return status;
 609         status = nfsd_link(rqstp, &cstate->current_fh,
 610                            link->li_name, link->li_namelen, &cstate->save_fh);
 611         if (!status)
 612                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 613         return status;
 614 }
 615
 616 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 617 {
 618         struct svc_fh tmp_fh;
 619         __be32 ret;
 620
 621         fh_init(&tmp_fh, NFS4_FHSIZE);
 622         ret = exp_pseudoroot(rqstp, &tmp_fh);
 623         if (ret)
 624                 return ret;
 625         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 626                 fh_put(&tmp_fh);
 627                 return nfserr_noent;
 628         }
 629         fh_put(&tmp_fh);
 630         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 631 }
 632
 633 static __be32
 634 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 635               void *arg)
 636 {
 637         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 638 }
 639
 640 static __be32
 641 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 642              struct nfsd4_lookup *lookup)
 643 {
 644         return nfsd_lookup(rqstp, &cstate->current_fh,
 645                            lookup->lo_name, lookup->lo_len,
 646                            &cstate->current_fh);
 647 }
 648
 649 static __be32
 650 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 651            struct nfsd4_read *read)
 652 {
 653         __be32 status;
 654
 655         /* no need to check permission - this will be done in nfsd_read() */
 656
 657         read->rd_filp = NULL;
 658         if (read->rd_offset >= OFFSET_MAX)
 659                 return nfserr_inval;
 660
 661         nfs4_lock_state();
 662         /* check stateid */
 663         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 664                                                  RD_STATE, &read->rd_filp))) {
 665                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 666                 goto out;
 667         }
 668         if (read->rd_filp)
 669                 get_file(read->rd_filp);
 670         status = nfs_ok;
 671 out:
 672         nfs4_unlock_state();
 673         read->rd_rqstp = rqstp;
 674         read->rd_fhp = &cstate->current_fh;
 675         return status;
 676 }
 677
 678 static __be32
 679 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 680               struct nfsd4_readdir *readdir)
 681 {
 682         u64 cookie = readdir->rd_cookie;
 683         static const nfs4_verifier zeroverf;
 684
 685         /* no need to check permission - this will be done in nfsd_readdir() */
 686
 687         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 688                 return nfserr_inval;
 689
 690         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 691         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 692         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 693
 694         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 695             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 696                 return nfserr_bad_cookie;
 697
 698         readdir->rd_rqstp = rqstp;
 699         readdir->rd_fhp = &cstate->current_fh;
 700         return nfs_ok;
 701 }
 702
 703 static __be32
 704 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 705                struct nfsd4_readlink *readlink)
 706 {
 707         readlink->rl_rqstp = rqstp;
 708         readlink->rl_fhp = &cstate->current_fh;
 709         return nfs_ok;
 710 }
 711
 712 static __be32
 713 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 714              struct nfsd4_remove *remove)
 715 {
 716         __be32 status;
 717
 718         if (locks_in_grace())
 719                 return nfserr_grace;
 720         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 721                              remove->rm_name, remove->rm_namelen);
 722         if (status == nfserr_symlink)
 723                 return nfserr_notdir;
 724         if (!status) {
 725                 fh_unlock(&cstate->current_fh);
 726                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 727         }
 728         return status;
 729 }
 730
 731 static __be32
 732 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 733              struct nfsd4_rename *rename)
 734 {
 735         __be32 status = nfserr_nofilehandle;
 736
 737         if (!cstate->save_fh.fh_dentry)
 738                 return status;
 739         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 740                                         & NFSEXP_NOSUBTREECHECK))
 741                 return nfserr_grace;
 742         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 743                              rename->rn_snamelen, &cstate->current_fh,
 744                              rename->rn_tname, rename->rn_tnamelen);
 745
 746         /* the underlying filesystem returns different error's than required
 747          * by NFSv4. both save_fh and current_fh have been verified.. */
 748         if (status == nfserr_isdir)
 749                 status = nfserr_exist;
 750         else if ((status == nfserr_notdir) &&
 751                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 752                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 753                 status = nfserr_exist;
 754         else if (status == nfserr_symlink)
 755                 status = nfserr_notdir;
 756
 757         if (!status) {
 758                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 759                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 760         }
 761         return status;
 762 }
 763
 764 static __be32
 765 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 766               struct nfsd4_secinfo *secinfo)
 767 {
 768         struct svc_fh resfh;
 769         struct svc_export *exp;
 770         struct dentry *dentry;
 771         __be32 err;
 772
 773         fh_init(&resfh, NFS4_FHSIZE);
 774         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 775         if (err)
 776                 return err;
 777         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 778                                     secinfo->si_name, secinfo->si_namelen,
 779                                     &exp, &dentry);
 780         if (err)
 781                 return err;
 782         if (dentry->d_inode == NULL) {
 783                 exp_put(exp);
 784                 err = nfserr_noent;
 785         } else
 786                 secinfo->si_exp = exp;
 787         dput(dentry);
 788         if (cstate->minorversion)
 789                 /* See rfc 5661 section 2.6.3.1.1.8 */
 790                 fh_put(&cstate->current_fh);
 791         return err;
 792 }
 793
 794 static __be32
 795 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 796               struct nfsd4_secinfo_no_name *sin)
 797 {
 798         __be32 err;
 799
 800         switch (sin->sin_style) {
 801         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 802                 break;
 803         case NFS4_SECINFO_STYLE4_PARENT:
 804                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 805                 if (err)
 806                         return err;
 807                 break;
 808         default:
 809                 return nfserr_inval;
 810         }
 811         exp_get(cstate->current_fh.fh_export);
 812         sin->sin_exp = cstate->current_fh.fh_export;
 813         fh_put(&cstate->current_fh);
 814         return nfs_ok;
 815 }
 816
 817 static __be32
 818 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 819               struct nfsd4_setattr *setattr)
 820 {
 821         __be32 status = nfs_ok;
 822
 823         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 824                 nfs4_lock_state();
 825                 status = nfs4_preprocess_stateid_op(cstate,
 826                         &setattr->sa_stateid, WR_STATE, NULL);
 827                 nfs4_unlock_state();
 828                 if (status) {
 829                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 830                         return status;
 831                 }
 832         }
 833         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 834         if (status)
 835                 return status;
 836         status = nfs_ok;
 837
 838         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 839                                     nfsd_attrmask);
 840         if (status)
 841                 goto out;
 842
 843         if (setattr->sa_acl != NULL)
 844                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 845                                             setattr->sa_acl);
 846         if (status)
 847                 goto out;
 848         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 849                                 0, (time_t)0);
 850 out:
 851         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 852         return status;
 853 }
 854
 855 static __be32
 856 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 857             struct nfsd4_write *write)
 858 {
 859         stateid_t *stateid = &write->wr_stateid;
 860         struct file *filp = NULL;
 861         u32 *p;
 862         __be32 status = nfs_ok;
 863         unsigned long cnt;
 864
 865         /* no need to check permission - this will be done in nfsd_write() */
 866
 867         if (write->wr_offset >= OFFSET_MAX)
 868                 return nfserr_inval;
 869
 870         nfs4_lock_state();
 871         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 872         if (filp)
 873                 get_file(filp);
 874         nfs4_unlock_state();
 875
 876         if (status) {
 877                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 878                 return status;
 879         }
 880
 881         cnt = write->wr_buflen;
 882         write->wr_how_written = write->wr_stable_how;
 883         p = (u32 *)write->wr_verifier.data;
 884         *p++ = nfssvc_boot.tv_sec;
 885         *p++ = nfssvc_boot.tv_usec;
 886
 887         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 888                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 889                              &cnt, &write->wr_how_written);
 890         if (filp)
 891                 fput(filp);
 892
 893         write->wr_bytes_written = cnt;
 894
 895         if (status == nfserr_symlink)
 896                 status = nfserr_inval;
 897         return status;
 898 }
 899
 900 /* This routine never returns NFS_OK!  If there are no other errors, it
 901  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 902  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 903  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 904  */
 905 static __be32
 906 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 907              struct nfsd4_verify *verify)
 908 {
 909         __be32 *buf, *p;
 910         int count;
 911         __be32 status;
 912
 913         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 914         if (status)
 915                 return status;
 916
 917         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 918         if (status)
 919                 return status;
 920
 921         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 922             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 923                 return nfserr_inval;
 924         if (verify->ve_attrlen & 3)
 925                 return nfserr_inval;
 926
 927         /* count in words:
 928          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 929          */
 930         count = 4 + (verify->ve_attrlen >> 2);
 931         buf = kmalloc(count << 2, GFP_KERNEL);
 932         if (!buf)
 933                 return nfserr_resource;
 934
 935         status = nfsd4_encode_fattr(&cstate->current_fh,
 936                                     cstate->current_fh.fh_export,
 937                                     cstate->current_fh.fh_dentry, buf,
 938                                     &count, verify->ve_bmval,
 939                                     rqstp, 0);
 940
 941         /* this means that nfsd4_encode_fattr() ran out of space */
 942         if (status == nfserr_resource && count == 0)
 943                 status = nfserr_not_same;
 944         if (status)
 945                 goto out_kfree;
 946
 947         /* skip bitmap */
 948         p = buf + 1 + ntohl(buf[0]);
 949         status = nfserr_not_same;
 950         if (ntohl(*p++) != verify->ve_attrlen)
 951                 goto out_kfree;
 952         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 953                 status = nfserr_same;
 954
 955 out_kfree:
 956         kfree(buf);
 957         return status;
 958 }
 959
 960 static __be32
 961 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 962               struct nfsd4_verify *verify)
 963 {
 964         __be32 status;
 965
 966         status = _nfsd4_verify(rqstp, cstate, verify);
 967         return status == nfserr_not_same ? nfs_ok : status;
 968 }
 969
 970 static __be32
 971 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 972              struct nfsd4_verify *verify)
 973 {
 974         __be32 status;
 975
 976         status = _nfsd4_verify(rqstp, cstate, verify);
 977         return status == nfserr_same ? nfs_ok : status;
 978 }
 979
 980 /*
 981  * NULL call.
 982  */
 983 static __be32
 984 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 985 {
 986         return nfs_ok;
 987 }
 988
 989 static inline void nfsd4_increment_op_stats(u32 opnum)
 990 {
 991         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 992                 nfsdstats.nfs4_opcount[opnum]++;
 993 }
 994
 995 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 996                               void *);
 997 enum nfsd4_op_flags {
 998         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 999         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1000         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1001         /* For rfc 5661 section 2.6.3.1.1: */
1002         OP_HANDLES_WRONGSEC = 1 << 3,
1003         OP_IS_PUTFH_LIKE = 1 << 4,
1004 };
1005
1006 struct nfsd4_operation {
1007         nfsd4op_func op_func;
1008         u32 op_flags;
1009         char *op_name;
1010 };
1011
1012 static struct nfsd4_operation nfsd4_ops[];
1013
1014 static const char *nfsd4_op_name(unsigned opnum);
1015
1016 /*
1017  * Enforce NFSv4.1 COMPOUND ordering rules:
1018  *
1019  * Also note, enforced elsewhere:
1020  *      - SEQUENCE other than as first op results in
1021  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1022  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1023  *        (Enforced in nfsd4_bind_conn_to_session().)
1024  *      - DESTROY_SESSION must be the final operation in a compound, if
1025  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1026  *        (Enforced in nfsd4_destroy_session().)
1027  */
1028 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1029 {
1030         struct nfsd4_op *op = &args->ops[0];
1031
1032         /* These ordering requirements don't apply to NFSv4.0: */
1033         if (args->minorversion == 0)
1034                 return nfs_ok;
1035         /* This is weird, but OK, not our problem: */
1036         if (args->opcnt == 0)
1037                 return nfs_ok;
1038         if (op->status == nfserr_op_illegal)
1039                 return nfs_ok;
1040         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1041                 return nfserr_op_not_in_session;
1042         if (op->opnum == OP_SEQUENCE)
1043                 return nfs_ok;
1044         if (args->opcnt != 1)
1045                 return nfserr_not_only_op;
1046         return nfs_ok;
1047 }
1048
1049 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1050 {
1051         return &nfsd4_ops[op->opnum];
1052 }
1053
1054 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1055 {
1056         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1057         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1058         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1059         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1060         struct nfsd4_operation *thisd;
1061         struct nfsd4_operation *nextd;
1062
1063         thisd = OPDESC(this);
1064         /*
1065          * Most ops check wronsec on our own; only the putfh-like ops
1066          * have special rules.
1067          */
1068         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1069                 return false;
1070         /*
1071          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1072          * put-filehandle operation if we're not going to use the
1073          * result:
1074          */
1075         if (argp->opcnt == resp->opcnt)
1076                 return false;
1077
1078         nextd = OPDESC(next);
1079         /*
1080          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1081          * errors themselves as necessary; others should check for them
1082          * now:
1083          */
1084         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1085 }
1086
1087 /*
1088  * COMPOUND call.
1089  */
1090 static __be32
1091 nfsd4_proc_compound(struct svc_rqst *rqstp,
1092                     struct nfsd4_compoundargs *args,
1093                     struct nfsd4_compoundres *resp)
1094 {
1095         struct nfsd4_op *op;
1096         struct nfsd4_operation *opdesc;
1097         struct nfsd4_compound_state *cstate = &resp->cstate;
1098         int             slack_bytes;
1099         __be32          status;
1100
1101         resp->xbuf = &rqstp->rq_res;
1102         resp->p = rqstp->rq_res.head[0].iov_base +
1103                                                 rqstp->rq_res.head[0].iov_len;
1104         resp->tagp = resp->p;
1105         /* reserve space for: taglen, tag, and opcnt */
1106         resp->p += 2 + XDR_QUADLEN(args->taglen);
1107         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1108         resp->taglen = args->taglen;
1109         resp->tag = args->tag;
1110         resp->opcnt = 0;
1111         resp->rqstp = rqstp;
1112         resp->cstate.minorversion = args->minorversion;
1113         resp->cstate.replay_owner = NULL;
1114         resp->cstate.session = NULL;
1115         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1116         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1117         /*
1118          * Don't use the deferral mechanism for NFSv4; compounds make it
1119          * too hard to avoid non-idempotency problems.
1120          */
1121         rqstp->rq_usedeferral = 0;
1122
1123         /*
1124          * According to RFC3010, this takes precedence over all other errors.
1125          */
1126         status = nfserr_minor_vers_mismatch;
1127         if (args->minorversion > nfsd_supported_minorversion)
1128                 goto out;
1129
1130         status = nfs41_check_op_ordering(args);
1131         if (status) {
1132                 op = &args->ops[0];
1133                 op->status = status;
1134                 goto encode_op;
1135         }
1136
1137         while (!status && resp->opcnt < args->opcnt) {
1138                 op = &args->ops[resp->opcnt++];
1139
1140                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1141                         resp->opcnt, args->opcnt, op->opnum,
1142                         nfsd4_op_name(op->opnum));
1143                 /*
1144                  * The XDR decode routines may have pre-set op->status;
1145                  * for example, if there is a miscellaneous XDR error
1146                  * it will be set to nfserr_bad_xdr.
1147                  */
1148                 if (op->status)
1149                         goto encode_op;
1150
1151                 /* We must be able to encode a successful response to
1152                  * this operation, with enough room left over to encode a
1153                  * failed response to the next operation.  If we don't
1154                  * have enough room, fail with ERR_RESOURCE.
1155                  */
1156                 slack_bytes = (char *)resp->end - (char *)resp->p;
1157                 if (slack_bytes < COMPOUND_SLACK_SPACE
1158                                 + COMPOUND_ERR_SLACK_SPACE) {
1159                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1160                         op->status = nfserr_resource;
1161                         goto encode_op;
1162                 }
1163
1164                 opdesc = OPDESC(op);
1165
1166                 if (!cstate->current_fh.fh_dentry) {
1167                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1168                                 op->status = nfserr_nofilehandle;
1169                                 goto encode_op;
1170                         }
1171                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1172                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1173                         op->status = nfserr_moved;
1174                         goto encode_op;
1175                 }
1176
1177                 if (opdesc->op_func)
1178                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1179                 else
1180                         BUG_ON(op->status == nfs_ok);
1181
1182                 if (!op->status && need_wrongsec_check(rqstp))
1183                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1184
1185 encode_op:
1186                 /* Only from SEQUENCE */
1187                 if (resp->cstate.status == nfserr_replay_cache) {
1188                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1189                         status = op->status;
1190                         goto out;
1191                 }
1192                 if (op->status == nfserr_replay_me) {
1193                         op->replay = &cstate->replay_owner->so_replay;
1194                         nfsd4_encode_replay(resp, op);
1195                         status = op->status = op->replay->rp_status;
1196                 } else {
1197                         nfsd4_encode_operation(resp, op);
1198                         status = op->status;
1199                 }
1200
1201                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1202                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1203                         be32_to_cpu(status));
1204
1205                 if (cstate->replay_owner) {
1206                         nfs4_put_stateowner(cstate->replay_owner);
1207                         cstate->replay_owner = NULL;
1208                 }
1209                 /* XXX Ugh, we need to get rid of this kind of special case: */
1210                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1211                         fput(op->u.read.rd_filp);
1212
1213                 nfsd4_increment_op_stats(op->opnum);
1214         }
1215
1216         resp->cstate.status = status;
1217         fh_put(&resp->cstate.current_fh);
1218         fh_put(&resp->cstate.save_fh);
1219         BUG_ON(resp->cstate.replay_owner);
1220 out:
1221         nfsd4_release_compoundargs(args);
1222         /* Reset deferral mechanism for RPC deferrals */
1223         rqstp->rq_usedeferral = 1;
1224         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1225         return status;
1226 }
1227
1228 static struct nfsd4_operation nfsd4_ops[] = {
1229         [OP_ACCESS] = {
1230                 .op_func = (nfsd4op_func)nfsd4_access,
1231                 .op_name = "OP_ACCESS",
1232         },
1233         [OP_CLOSE] = {
1234                 .op_func = (nfsd4op_func)nfsd4_close,
1235                 .op_name = "OP_CLOSE",
1236         },
1237         [OP_COMMIT] = {
1238                 .op_func = (nfsd4op_func)nfsd4_commit,
1239                 .op_name = "OP_COMMIT",
1240         },
1241         [OP_CREATE] = {
1242                 .op_func = (nfsd4op_func)nfsd4_create,
1243                 .op_name = "OP_CREATE",
1244         },
1245         [OP_DELEGRETURN] = {
1246                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1247                 .op_name = "OP_DELEGRETURN",
1248         },
1249         [OP_GETATTR] = {
1250                 .op_func = (nfsd4op_func)nfsd4_getattr,
1251                 .op_flags = ALLOWED_ON_ABSENT_FS,
1252                 .op_name = "OP_GETATTR",
1253         },
1254         [OP_GETFH] = {
1255                 .op_func = (nfsd4op_func)nfsd4_getfh,
1256                 .op_name = "OP_GETFH",
1257         },
1258         [OP_LINK] = {
1259                 .op_func = (nfsd4op_func)nfsd4_link,
1260                 .op_name = "OP_LINK",
1261         },
1262         [OP_LOCK] = {
1263                 .op_func = (nfsd4op_func)nfsd4_lock,
1264                 .op_name = "OP_LOCK",
1265         },
1266         [OP_LOCKT] = {
1267                 .op_func = (nfsd4op_func)nfsd4_lockt,
1268                 .op_name = "OP_LOCKT",
1269         },
1270         [OP_LOCKU] = {
1271                 .op_func = (nfsd4op_func)nfsd4_locku,
1272                 .op_name = "OP_LOCKU",
1273         },
1274         [OP_LOOKUP] = {
1275                 .op_func = (nfsd4op_func)nfsd4_lookup,
1276                 .op_flags = OP_HANDLES_WRONGSEC,
1277                 .op_name = "OP_LOOKUP",
1278         },
1279         [OP_LOOKUPP] = {
1280                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1281                 .op_flags = OP_HANDLES_WRONGSEC,
1282                 .op_name = "OP_LOOKUPP",
1283         },
1284         [OP_NVERIFY] = {
1285                 .op_func = (nfsd4op_func)nfsd4_nverify,
1286                 .op_name = "OP_NVERIFY",
1287         },
1288         [OP_OPEN] = {
1289                 .op_func = (nfsd4op_func)nfsd4_open,
1290                 .op_flags = OP_HANDLES_WRONGSEC,
1291                 .op_name = "OP_OPEN",
1292         },
1293         [OP_OPEN_CONFIRM] = {
1294                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1295                 .op_name = "OP_OPEN_CONFIRM",
1296         },
1297         [OP_OPEN_DOWNGRADE] = {
1298                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1299                 .op_name = "OP_OPEN_DOWNGRADE",
1300         },
1301         [OP_PUTFH] = {
1302                 .op_func = (nfsd4op_func)nfsd4_putfh,
1303                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1304                                 | OP_IS_PUTFH_LIKE,
1305                 .op_name = "OP_PUTFH",
1306         },
1307         [OP_PUTPUBFH] = {
1308                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1309                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1310                                 | OP_IS_PUTFH_LIKE,
1311                 .op_name = "OP_PUTPUBFH",
1312         },
1313         [OP_PUTROOTFH] = {
1314                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1315                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1316                                 | OP_IS_PUTFH_LIKE,
1317                 .op_name = "OP_PUTROOTFH",
1318         },
1319         [OP_READ] = {
1320                 .op_func = (nfsd4op_func)nfsd4_read,
1321                 .op_name = "OP_READ",
1322         },
1323         [OP_READDIR] = {
1324                 .op_func = (nfsd4op_func)nfsd4_readdir,
1325                 .op_name = "OP_READDIR",
1326         },
1327         [OP_READLINK] = {
1328                 .op_func = (nfsd4op_func)nfsd4_readlink,
1329                 .op_name = "OP_READLINK",
1330         },
1331         [OP_REMOVE] = {
1332                 .op_func = (nfsd4op_func)nfsd4_remove,
1333                 .op_name = "OP_REMOVE",
1334         },
1335         [OP_RENAME] = {
1336                 .op_name = "OP_RENAME",
1337                 .op_func = (nfsd4op_func)nfsd4_rename,
1338         },
1339         [OP_RENEW] = {
1340                 .op_func = (nfsd4op_func)nfsd4_renew,
1341                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1342                 .op_name = "OP_RENEW",
1343         },
1344         [OP_RESTOREFH] = {
1345                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1346                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1347                                 | OP_IS_PUTFH_LIKE,
1348                 .op_name = "OP_RESTOREFH",
1349         },
1350         [OP_SAVEFH] = {
1351                 .op_func = (nfsd4op_func)nfsd4_savefh,
1352                 .op_flags = OP_HANDLES_WRONGSEC,
1353                 .op_name = "OP_SAVEFH",
1354         },
1355         [OP_SECINFO] = {
1356                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1357                 .op_flags = OP_HANDLES_WRONGSEC,
1358                 .op_name = "OP_SECINFO",
1359         },
1360         [OP_SETATTR] = {
1361                 .op_func = (nfsd4op_func)nfsd4_setattr,
1362                 .op_name = "OP_SETATTR",
1363         },
1364         [OP_SETCLIENTID] = {
1365                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1366                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1367                 .op_name = "OP_SETCLIENTID",
1368         },
1369         [OP_SETCLIENTID_CONFIRM] = {
1370                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1371                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1372                 .op_name = "OP_SETCLIENTID_CONFIRM",
1373         },
1374         [OP_VERIFY] = {
1375                 .op_func = (nfsd4op_func)nfsd4_verify,
1376                 .op_name = "OP_VERIFY",
1377         },
1378         [OP_WRITE] = {
1379                 .op_func = (nfsd4op_func)nfsd4_write,
1380                 .op_name = "OP_WRITE",
1381         },
1382         [OP_RELEASE_LOCKOWNER] = {
1383                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1384                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1385                 .op_name = "OP_RELEASE_LOCKOWNER",
1386         },
1387
1388         /* NFSv4.1 operations */
1389         [OP_EXCHANGE_ID] = {
1390                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1391                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1392                 .op_name = "OP_EXCHANGE_ID",
1393         },
1394         [OP_BIND_CONN_TO_SESSION] = {
1395                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1396                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1397                 .op_name = "OP_BIND_CONN_TO_SESSION",
1398         },
1399         [OP_CREATE_SESSION] = {
1400                 .op_func = (nfsd4op_func)nfsd4_create_session,
1401                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1402                 .op_name = "OP_CREATE_SESSION",
1403         },
1404         [OP_DESTROY_SESSION] = {
1405                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1406                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1407                 .op_name = "OP_DESTROY_SESSION",
1408         },
1409         [OP_SEQUENCE] = {
1410                 .op_func = (nfsd4op_func)nfsd4_sequence,
1411                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1412                 .op_name = "OP_SEQUENCE",
1413         },
1414         [OP_DESTROY_CLIENTID] = {
1415                 .op_func = NULL,
1416                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1417                 .op_name = "OP_DESTROY_CLIENTID",
1418         },
1419         [OP_RECLAIM_COMPLETE] = {
1420                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1421                 .op_flags = ALLOWED_WITHOUT_FH,
1422                 .op_name = "OP_RECLAIM_COMPLETE",
1423         },
1424         [OP_SECINFO_NO_NAME] = {
1425                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1426                 .op_flags = OP_HANDLES_WRONGSEC,
1427                 .op_name = "OP_SECINFO_NO_NAME",
1428         },
1429         [OP_TEST_STATEID] = {
1430                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1431                 .op_flags = ALLOWED_WITHOUT_FH,
1432                 .op_name = "OP_TEST_STATEID",
1433         },
1434         [OP_FREE_STATEID] = {
1435                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1436                 .op_flags = ALLOWED_WITHOUT_FH,
1437                 .op_name = "OP_FREE_STATEID",
1438         },
1439 };
1440
1441 static const char *nfsd4_op_name(unsigned opnum)
1442 {
1443         if (opnum < ARRAY_SIZE(nfsd4_ops))
1444                 return nfsd4_ops[opnum].op_name;
1445         return "unknown_operation";
1446 }
1447
1448 #define nfsd4_voidres                   nfsd4_voidargs
1449 struct nfsd4_voidargs { int dummy; };
1450
1451 /*
1452  * TODO: At the present time, the NFSv4 server does not do XID caching
1453  * of requests.  Implementing XID caching would not be a serious problem,
1454  * although it would require a mild change in interfaces since one
1455  * doesn't know whether an NFSv4 request is idempotent until after the
1456  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1457  * Astrand's regression testsuite for NFSv4 servers), which reuses
1458  * XID's liberally, so I've left it unimplemented until pynfs generates
1459  * better XID's.
1460  */
1461 static struct svc_procedure             nfsd_procedures4[2] = {
1462         [NFSPROC4_NULL] = {
1463                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1464                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1465                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1466                 .pc_ressize = sizeof(struct nfsd4_voidres),
1467                 .pc_cachetype = RC_NOCACHE,
1468                 .pc_xdrressize = 1,
1469         },
1470         [NFSPROC4_COMPOUND] = {
1471                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1472                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1473                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1474                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1475                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1476                 .pc_cachetype = RC_NOCACHE,
1477                 .pc_xdrressize = NFSD_BUFSIZE/4,
1478         },
1479 };
1480
1481 struct svc_version      nfsd_version4 = {
1482                 .vs_vers        = 4,
1483                 .vs_nproc       = 2,
1484                 .vs_proc        = nfsd_procedures4,
1485                 .vs_dispatch    = nfsd_dispatch,
1486                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1487 };
1488
1489 /*
1490  * Local variables:
1491  *  c-basic-offset: 8
1492  * End:
1493  */