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   1 /*
   2  *  fs/nfsd/nfs4proc.c
   3  *
   4  *  Server-side procedures for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/param.h>
  39 #include <linux/major.h>
  40 #include <linux/slab.h>
  41 #include <linux/file.h>
  42
  43 #include <linux/sunrpc/svc.h>
  44 #include <linux/nfsd/nfsd.h>
  45 #include <linux/nfsd/cache.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfsd/state.h>
  48 #include <linux/nfsd/xdr4.h>
  49 #include <linux/nfs4_acl.h>
  50 #include <linux/sunrpc/gss_api.h>
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 static inline void
  55 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  56 {
  57         fh_put(dst);
  58         dget(src->fh_dentry);
  59         if (src->fh_export)
  60                 cache_get(&src->fh_export->h);
  61         *dst = *src;
  62 }
  63
  64 static __be32
  65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
  66 {
  67         __be32 status;
  68
  69         if (open->op_truncate &&
  70                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  71                 return nfserr_inval;
  72
  73         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  74                 accmode |= NFSD_MAY_READ;
  75         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
  76                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
  77         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
  78                 accmode |= NFSD_MAY_WRITE;
  79
  80         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  81
  82         return status;
  83 }
  84
  85 static __be32
  86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  87 {
  88         struct svc_fh resfh;
  89         __be32 status;
  90         int created = 0;
  91
  92         fh_init(&resfh, NFS4_FHSIZE);
  93         open->op_truncate = 0;
  94
  95         if (open->op_create) {
  96                 /*
  97                  * Note: create modes (UNCHECKED,GUARDED...) are the same
  98                  * in NFSv4 as in v3.
  99                  */
 100                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 101                                         open->op_fname.len, &open->op_iattr,
 102                                         &resfh, open->op_createmode,
 103                                         (u32 *)open->op_verf.data,
 104                                         &open->op_truncate, &created);
 105
 106                 /*
 107                  * Following rfc 3530 14.2.16, use the returned bitmask
 108                  * to indicate which attributes we used to store the
 109                  * verifier:
 110                  */
 111                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 112                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 113                                                 FATTR4_WORD1_TIME_MODIFY);
 114         } else {
 115                 status = nfsd_lookup(rqstp, current_fh,
 116                                      open->op_fname.data, open->op_fname.len, &resfh);
 117                 fh_unlock(current_fh);
 118         }
 119         if (status)
 120                 goto out;
 121
 122         set_change_info(&open->op_cinfo, current_fh);
 123         fh_dup2(current_fh, &resfh);
 124
 125         /* set reply cache */
 126         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 127                         &resfh.fh_handle);
 128         if (!created)
 129                 status = do_open_permission(rqstp, current_fh, open,
 130                                             NFSD_MAY_NOP);
 131
 132 out:
 133         fh_put(&resfh);
 134         return status;
 135 }
 136
 137 static __be32
 138 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 139 {
 140         __be32 status;
 141
 142         /* Only reclaims from previously confirmed clients are valid */
 143         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 144                 return status;
 145
 146         /* We don't know the target directory, and therefore can not
 147         * set the change info
 148         */
 149
 150         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 151
 152         /* set replay cache */
 153         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 154                         &current_fh->fh_handle);
 155
 156         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 157                 (open->op_iattr.ia_size == 0);
 158
 159         status = do_open_permission(rqstp, current_fh, open,
 160                                     NFSD_MAY_OWNER_OVERRIDE);
 161
 162         return status;
 163 }
 164
 165
 166 static __be32
 167 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 168            struct nfsd4_open *open)
 169 {
 170         __be32 status;
 171         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 172                 (int)open->op_fname.len, open->op_fname.data,
 173                 open->op_stateowner);
 174
 175         /* This check required by spec. */
 176         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 177                 return nfserr_inval;
 178
 179         nfs4_lock_state();
 180
 181         /* check seqid for replay. set nfs4_owner */
 182         status = nfsd4_process_open1(open);
 183         if (status == nfserr_replay_me) {
 184                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 185                 fh_put(&cstate->current_fh);
 186                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 187                                 &rp->rp_openfh);
 188                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 189                 if (status)
 190                         dprintk("nfsd4_open: replay failed"
 191                                 " restoring previous filehandle\n");
 192                 else
 193                         status = nfserr_replay_me;
 194         }
 195         if (status)
 196                 goto out;
 197
 198         /* Openowner is now set, so sequence id will get bumped.  Now we need
 199          * these checks before we do any creates: */
 200         status = nfserr_grace;
 201         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 202                 goto out;
 203         status = nfserr_no_grace;
 204         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 205                 goto out;
 206
 207         switch (open->op_claim_type) {
 208                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 209                         status = nfserr_inval;
 210                         if (open->op_create)
 211                                 goto out;
 212                         /* fall through */
 213                 case NFS4_OPEN_CLAIM_NULL:
 214                         /*
 215                          * (1) set CURRENT_FH to the file being opened,
 216                          * creating it if necessary, (2) set open->op_cinfo,
 217                          * (3) set open->op_truncate if the file is to be
 218                          * truncated after opening, (4) do permission checking.
 219                          */
 220                         status = do_open_lookup(rqstp, &cstate->current_fh,
 221                                                 open);
 222                         if (status)
 223                                 goto out;
 224                         break;
 225                 case NFS4_OPEN_CLAIM_PREVIOUS:
 226                         open->op_stateowner->so_confirmed = 1;
 227                         /*
 228                          * The CURRENT_FH is already set to the file being
 229                          * opened.  (1) set open->op_cinfo, (2) set
 230                          * open->op_truncate if the file is to be truncated
 231                          * after opening, (3) do permission checking.
 232                         */
 233                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 234                                                  open);
 235                         if (status)
 236                                 goto out;
 237                         break;
 238                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 239                         open->op_stateowner->so_confirmed = 1;
 240                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 241                                 open->op_claim_type);
 242                         status = nfserr_notsupp;
 243                         goto out;
 244                 default:
 245                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 246                                 open->op_claim_type);
 247                         status = nfserr_inval;
 248                         goto out;
 249         }
 250         /*
 251          * nfsd4_process_open2() does the actual opening of the file.  If
 252          * successful, it (1) truncates the file if open->op_truncate was
 253          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 254          */
 255         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 256 out:
 257         if (open->op_stateowner) {
 258                 nfs4_get_stateowner(open->op_stateowner);
 259                 cstate->replay_owner = open->op_stateowner;
 260         }
 261         nfs4_unlock_state();
 262         return status;
 263 }
 264
 265 /*
 266  * filehandle-manipulating ops.
 267  */
 268 static __be32
 269 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 270             struct svc_fh **getfh)
 271 {
 272         if (!cstate->current_fh.fh_dentry)
 273                 return nfserr_nofilehandle;
 274
 275         *getfh = &cstate->current_fh;
 276         return nfs_ok;
 277 }
 278
 279 static __be32
 280 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 281             struct nfsd4_putfh *putfh)
 282 {
 283         fh_put(&cstate->current_fh);
 284         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 285         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 286                putfh->pf_fhlen);
 287         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 288 }
 289
 290 static __be32
 291 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 292                 void *arg)
 293 {
 294         __be32 status;
 295
 296         fh_put(&cstate->current_fh);
 297         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 298         return status;
 299 }
 300
 301 static __be32
 302 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 303                 void *arg)
 304 {
 305         if (!cstate->save_fh.fh_dentry)
 306                 return nfserr_restorefh;
 307
 308         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 309         return nfs_ok;
 310 }
 311
 312 static __be32
 313 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 314              void *arg)
 315 {
 316         if (!cstate->current_fh.fh_dentry)
 317                 return nfserr_nofilehandle;
 318
 319         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 320         return nfs_ok;
 321 }
 322
 323 /*
 324  * misc nfsv4 ops
 325  */
 326 static __be32
 327 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 328              struct nfsd4_access *access)
 329 {
 330         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 331                 return nfserr_inval;
 332
 333         access->ac_resp_access = access->ac_req_access;
 334         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 335                            &access->ac_supported);
 336 }
 337
 338 static __be32
 339 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 340              struct nfsd4_commit *commit)
 341 {
 342         __be32 status;
 343
 344         u32 *p = (u32 *)commit->co_verf.data;
 345         *p++ = nfssvc_boot.tv_sec;
 346         *p++ = nfssvc_boot.tv_usec;
 347
 348         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 349                              commit->co_count);
 350         if (status == nfserr_symlink)
 351                 status = nfserr_inval;
 352         return status;
 353 }
 354
 355 static __be32
 356 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 357              struct nfsd4_create *create)
 358 {
 359         struct svc_fh resfh;
 360         __be32 status;
 361         dev_t rdev;
 362
 363         fh_init(&resfh, NFS4_FHSIZE);
 364
 365         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 366                            NFSD_MAY_CREATE);
 367         if (status == nfserr_symlink)
 368                 status = nfserr_notdir;
 369         if (status)
 370                 return status;
 371
 372         switch (create->cr_type) {
 373         case NF4LNK:
 374                 /* ugh! we have to null-terminate the linktext, or
 375                  * vfs_symlink() will choke.  it is always safe to
 376                  * null-terminate by brute force, since at worst we
 377                  * will overwrite the first byte of the create namelen
 378                  * in the XDR buffer, which has already been extracted
 379                  * during XDR decode.
 380                  */
 381                 create->cr_linkname[create->cr_linklen] = 0;
 382
 383                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 384                                       create->cr_name, create->cr_namelen,
 385                                       create->cr_linkname, create->cr_linklen,
 386                                       &resfh, &create->cr_iattr);
 387                 break;
 388
 389         case NF4BLK:
 390                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 391                 if (MAJOR(rdev) != create->cr_specdata1 ||
 392                     MINOR(rdev) != create->cr_specdata2)
 393                         return nfserr_inval;
 394                 status = nfsd_create(rqstp, &cstate->current_fh,
 395                                      create->cr_name, create->cr_namelen,
 396                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 397                 break;
 398
 399         case NF4CHR:
 400                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 401                 if (MAJOR(rdev) != create->cr_specdata1 ||
 402                     MINOR(rdev) != create->cr_specdata2)
 403                         return nfserr_inval;
 404                 status = nfsd_create(rqstp, &cstate->current_fh,
 405                                      create->cr_name, create->cr_namelen,
 406                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 407                 break;
 408
 409         case NF4SOCK:
 410                 status = nfsd_create(rqstp, &cstate->current_fh,
 411                                      create->cr_name, create->cr_namelen,
 412                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 413                 break;
 414
 415         case NF4FIFO:
 416                 status = nfsd_create(rqstp, &cstate->current_fh,
 417                                      create->cr_name, create->cr_namelen,
 418                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 419                 break;
 420
 421         case NF4DIR:
 422                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 423                 status = nfsd_create(rqstp, &cstate->current_fh,
 424                                      create->cr_name, create->cr_namelen,
 425                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 426                 break;
 427
 428         default:
 429                 status = nfserr_badtype;
 430         }
 431
 432         if (!status) {
 433                 fh_unlock(&cstate->current_fh);
 434                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
 435                 fh_dup2(&cstate->current_fh, &resfh);
 436         }
 437
 438         fh_put(&resfh);
 439         return status;
 440 }
 441
 442 static __be32
 443 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 444               struct nfsd4_getattr *getattr)
 445 {
 446         __be32 status;
 447
 448         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 449         if (status)
 450                 return status;
 451
 452         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 453                 return nfserr_inval;
 454
 455         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 456         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 457
 458         getattr->ga_fhp = &cstate->current_fh;
 459         return nfs_ok;
 460 }
 461
 462 static __be32
 463 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 464            struct nfsd4_link *link)
 465 {
 466         __be32 status = nfserr_nofilehandle;
 467
 468         if (!cstate->save_fh.fh_dentry)
 469                 return status;
 470         status = nfsd_link(rqstp, &cstate->current_fh,
 471                            link->li_name, link->li_namelen, &cstate->save_fh);
 472         if (!status)
 473                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 474         return status;
 475 }
 476
 477 static __be32
 478 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 479               void *arg)
 480 {
 481         struct svc_fh tmp_fh;
 482         __be32 ret;
 483
 484         fh_init(&tmp_fh, NFS4_FHSIZE);
 485         ret = exp_pseudoroot(rqstp, &tmp_fh);
 486         if (ret)
 487                 return ret;
 488         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 489                 fh_put(&tmp_fh);
 490                 return nfserr_noent;
 491         }
 492         fh_put(&tmp_fh);
 493         return nfsd_lookup(rqstp, &cstate->current_fh,
 494                            "..", 2, &cstate->current_fh);
 495 }
 496
 497 static __be32
 498 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499              struct nfsd4_lookup *lookup)
 500 {
 501         return nfsd_lookup(rqstp, &cstate->current_fh,
 502                            lookup->lo_name, lookup->lo_len,
 503                            &cstate->current_fh);
 504 }
 505
 506 static __be32
 507 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 508            struct nfsd4_read *read)
 509 {
 510         __be32 status;
 511
 512         /* no need to check permission - this will be done in nfsd_read() */
 513
 514         read->rd_filp = NULL;
 515         if (read->rd_offset >= OFFSET_MAX)
 516                 return nfserr_inval;
 517
 518         nfs4_lock_state();
 519         /* check stateid */
 520         if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 521                                 &read->rd_stateid,
 522                                 RD_STATE, &read->rd_filp))) {
 523                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 524                 goto out;
 525         }
 526         if (read->rd_filp)
 527                 get_file(read->rd_filp);
 528         status = nfs_ok;
 529 out:
 530         nfs4_unlock_state();
 531         read->rd_rqstp = rqstp;
 532         read->rd_fhp = &cstate->current_fh;
 533         return status;
 534 }
 535
 536 static __be32
 537 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 538               struct nfsd4_readdir *readdir)
 539 {
 540         u64 cookie = readdir->rd_cookie;
 541         static const nfs4_verifier zeroverf;
 542
 543         /* no need to check permission - this will be done in nfsd_readdir() */
 544
 545         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 546                 return nfserr_inval;
 547
 548         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 549         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 550
 551         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 552             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 553                 return nfserr_bad_cookie;
 554
 555         readdir->rd_rqstp = rqstp;
 556         readdir->rd_fhp = &cstate->current_fh;
 557         return nfs_ok;
 558 }
 559
 560 static __be32
 561 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 562                struct nfsd4_readlink *readlink)
 563 {
 564         readlink->rl_rqstp = rqstp;
 565         readlink->rl_fhp = &cstate->current_fh;
 566         return nfs_ok;
 567 }
 568
 569 static __be32
 570 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 571              struct nfsd4_remove *remove)
 572 {
 573         __be32 status;
 574
 575         if (locks_in_grace())
 576                 return nfserr_grace;
 577         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 578                              remove->rm_name, remove->rm_namelen);
 579         if (status == nfserr_symlink)
 580                 return nfserr_notdir;
 581         if (!status) {
 582                 fh_unlock(&cstate->current_fh);
 583                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 584         }
 585         return status;
 586 }
 587
 588 static __be32
 589 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 590              struct nfsd4_rename *rename)
 591 {
 592         __be32 status = nfserr_nofilehandle;
 593
 594         if (!cstate->save_fh.fh_dentry)
 595                 return status;
 596         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 597                                         & NFSEXP_NOSUBTREECHECK))
 598                 return nfserr_grace;
 599         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 600                              rename->rn_snamelen, &cstate->current_fh,
 601                              rename->rn_tname, rename->rn_tnamelen);
 602
 603         /* the underlying filesystem returns different error's than required
 604          * by NFSv4. both save_fh and current_fh have been verified.. */
 605         if (status == nfserr_isdir)
 606                 status = nfserr_exist;
 607         else if ((status == nfserr_notdir) &&
 608                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 609                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 610                 status = nfserr_exist;
 611         else if (status == nfserr_symlink)
 612                 status = nfserr_notdir;
 613
 614         if (!status) {
 615                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 616                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 617         }
 618         return status;
 619 }
 620
 621 static __be32
 622 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 623               struct nfsd4_secinfo *secinfo)
 624 {
 625         struct svc_fh resfh;
 626         struct svc_export *exp;
 627         struct dentry *dentry;
 628         __be32 err;
 629
 630         fh_init(&resfh, NFS4_FHSIZE);
 631         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 632                                     secinfo->si_name, secinfo->si_namelen,
 633                                     &exp, &dentry);
 634         if (err)
 635                 return err;
 636         if (dentry->d_inode == NULL) {
 637                 exp_put(exp);
 638                 err = nfserr_noent;
 639         } else
 640                 secinfo->si_exp = exp;
 641         dput(dentry);
 642         return err;
 643 }
 644
 645 static __be32
 646 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 647               struct nfsd4_setattr *setattr)
 648 {
 649         __be32 status = nfs_ok;
 650
 651         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 652                 nfs4_lock_state();
 653                 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 654                         &setattr->sa_stateid, WR_STATE, NULL);
 655                 nfs4_unlock_state();
 656                 if (status) {
 657                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 658                         return status;
 659                 }
 660         }
 661         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 662         if (status)
 663                 return status;
 664         status = nfs_ok;
 665         if (setattr->sa_acl != NULL)
 666                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 667                                             setattr->sa_acl);
 668         if (status)
 669                 goto out;
 670         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 671                                 0, (time_t)0);
 672 out:
 673         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 674         return status;
 675 }
 676
 677 static __be32
 678 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 679             struct nfsd4_write *write)
 680 {
 681         stateid_t *stateid = &write->wr_stateid;
 682         struct file *filp = NULL;
 683         u32 *p;
 684         __be32 status = nfs_ok;
 685         unsigned long cnt;
 686
 687         /* no need to check permission - this will be done in nfsd_write() */
 688
 689         if (write->wr_offset >= OFFSET_MAX)
 690                 return nfserr_inval;
 691
 692         nfs4_lock_state();
 693         status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
 694                                         WR_STATE, &filp);
 695         if (filp)
 696                 get_file(filp);
 697         nfs4_unlock_state();
 698
 699         if (status) {
 700                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 701                 return status;
 702         }
 703
 704         cnt = write->wr_buflen;
 705         write->wr_how_written = write->wr_stable_how;
 706         p = (u32 *)write->wr_verifier.data;
 707         *p++ = nfssvc_boot.tv_sec;
 708         *p++ = nfssvc_boot.tv_usec;
 709
 710         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 711                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 712                              &cnt, &write->wr_how_written);
 713         if (filp)
 714                 fput(filp);
 715
 716         write->wr_bytes_written = cnt;
 717
 718         if (status == nfserr_symlink)
 719                 status = nfserr_inval;
 720         return status;
 721 }
 722
 723 /* This routine never returns NFS_OK!  If there are no other errors, it
 724  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 725  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 726  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 727  */
 728 static __be32
 729 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 730              struct nfsd4_verify *verify)
 731 {
 732         __be32 *buf, *p;
 733         int count;
 734         __be32 status;
 735
 736         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 737         if (status)
 738                 return status;
 739
 740         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 741             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 742                 return nfserr_attrnotsupp;
 743         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 744             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 745                 return nfserr_inval;
 746         if (verify->ve_attrlen & 3)
 747                 return nfserr_inval;
 748
 749         /* count in words:
 750          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 751          */
 752         count = 4 + (verify->ve_attrlen >> 2);
 753         buf = kmalloc(count << 2, GFP_KERNEL);
 754         if (!buf)
 755                 return nfserr_resource;
 756
 757         status = nfsd4_encode_fattr(&cstate->current_fh,
 758                                     cstate->current_fh.fh_export,
 759                                     cstate->current_fh.fh_dentry, buf,
 760                                     &count, verify->ve_bmval,
 761                                     rqstp, 0);
 762
 763         /* this means that nfsd4_encode_fattr() ran out of space */
 764         if (status == nfserr_resource && count == 0)
 765                 status = nfserr_not_same;
 766         if (status)
 767                 goto out_kfree;
 768
 769         p = buf + 3;
 770         status = nfserr_not_same;
 771         if (ntohl(*p++) != verify->ve_attrlen)
 772                 goto out_kfree;
 773         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 774                 status = nfserr_same;
 775
 776 out_kfree:
 777         kfree(buf);
 778         return status;
 779 }
 780
 781 static __be32
 782 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 783               struct nfsd4_verify *verify)
 784 {
 785         __be32 status;
 786
 787         status = _nfsd4_verify(rqstp, cstate, verify);
 788         return status == nfserr_not_same ? nfs_ok : status;
 789 }
 790
 791 static __be32
 792 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 793              struct nfsd4_verify *verify)
 794 {
 795         __be32 status;
 796
 797         status = _nfsd4_verify(rqstp, cstate, verify);
 798         return status == nfserr_same ? nfs_ok : status;
 799 }
 800
 801 /*
 802  * NULL call.
 803  */
 804 static __be32
 805 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 806 {
 807         return nfs_ok;
 808 }
 809
 810 static inline void nfsd4_increment_op_stats(u32 opnum)
 811 {
 812         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 813                 nfsdstats.nfs4_opcount[opnum]++;
 814 }
 815
 816 static void cstate_free(struct nfsd4_compound_state *cstate)
 817 {
 818         if (cstate == NULL)
 819                 return;
 820         fh_put(&cstate->current_fh);
 821         fh_put(&cstate->save_fh);
 822         BUG_ON(cstate->replay_owner);
 823         kfree(cstate);
 824 }
 825
 826 static struct nfsd4_compound_state *cstate_alloc(void)
 827 {
 828         struct nfsd4_compound_state *cstate;
 829
 830         cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
 831         if (cstate == NULL)
 832                 return NULL;
 833         fh_init(&cstate->current_fh, NFS4_FHSIZE);
 834         fh_init(&cstate->save_fh, NFS4_FHSIZE);
 835         cstate->replay_owner = NULL;
 836         return cstate;
 837 }
 838
 839 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 840                               void *);
 841
 842 struct nfsd4_operation {
 843         nfsd4op_func op_func;
 844         u32 op_flags;
 845 /* Most ops require a valid current filehandle; a few don't: */
 846 #define ALLOWED_WITHOUT_FH 1
 847 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
 848 #define ALLOWED_ON_ABSENT_FS 2
 849         char *op_name;
 850 };
 851
 852 static struct nfsd4_operation nfsd4_ops[];
 853
 854 static const char *nfsd4_op_name(unsigned opnum);
 855
 856 /*
 857  * COMPOUND call.
 858  */
 859 static __be32
 860 nfsd4_proc_compound(struct svc_rqst *rqstp,
 861                     struct nfsd4_compoundargs *args,
 862                     struct nfsd4_compoundres *resp)
 863 {
 864         struct nfsd4_op *op;
 865         struct nfsd4_operation *opdesc;
 866         struct nfsd4_compound_state *cstate = NULL;
 867         int             slack_bytes;
 868         __be32          status;
 869
 870         resp->xbuf = &rqstp->rq_res;
 871         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 872         resp->tagp = resp->p;
 873         /* reserve space for: taglen, tag, and opcnt */
 874         resp->p += 2 + XDR_QUADLEN(args->taglen);
 875         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 876         resp->taglen = args->taglen;
 877         resp->tag = args->tag;
 878         resp->opcnt = 0;
 879         resp->rqstp = rqstp;
 880
 881         /*
 882          * According to RFC3010, this takes precedence over all other errors.
 883          */
 884         status = nfserr_minor_vers_mismatch;
 885         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 886                 goto out;
 887
 888         status = nfserr_resource;
 889         cstate = cstate_alloc();
 890         if (cstate == NULL)
 891                 goto out;
 892
 893         status = nfs_ok;
 894         while (!status && resp->opcnt < args->opcnt) {
 895                 op = &args->ops[resp->opcnt++];
 896
 897                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
 898                         resp->opcnt, args->opcnt, op->opnum,
 899                         nfsd4_op_name(op->opnum));
 900
 901                 /*
 902                  * The XDR decode routines may have pre-set op->status;
 903                  * for example, if there is a miscellaneous XDR error
 904                  * it will be set to nfserr_bad_xdr.
 905                  */
 906                 if (op->status)
 907                         goto encode_op;
 908
 909                 /* We must be able to encode a successful response to
 910                  * this operation, with enough room left over to encode a
 911                  * failed response to the next operation.  If we don't
 912                  * have enough room, fail with ERR_RESOURCE.
 913                  */
 914                 slack_bytes = (char *)resp->end - (char *)resp->p;
 915                 if (slack_bytes < COMPOUND_SLACK_SPACE
 916                                 + COMPOUND_ERR_SLACK_SPACE) {
 917                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 918                         op->status = nfserr_resource;
 919                         goto encode_op;
 920                 }
 921
 922                 opdesc = &nfsd4_ops[op->opnum];
 923
 924                 if (!cstate->current_fh.fh_dentry) {
 925                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 926                                 op->status = nfserr_nofilehandle;
 927                                 goto encode_op;
 928                         }
 929                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 930                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 931                         op->status = nfserr_moved;
 932                         goto encode_op;
 933                 }
 934
 935                 if (opdesc->op_func)
 936                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 937                 else
 938                         BUG_ON(op->status == nfs_ok);
 939
 940 encode_op:
 941                 if (op->status == nfserr_replay_me) {
 942                         op->replay = &cstate->replay_owner->so_replay;
 943                         nfsd4_encode_replay(resp, op);
 944                         status = op->status = op->replay->rp_status;
 945                 } else {
 946                         nfsd4_encode_operation(resp, op);
 947                         status = op->status;
 948                 }
 949
 950                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
 951                         args->ops, args->opcnt, resp->opcnt, op->opnum,
 952                         be32_to_cpu(status));
 953
 954                 if (cstate->replay_owner) {
 955                         nfs4_put_stateowner(cstate->replay_owner);
 956                         cstate->replay_owner = NULL;
 957                 }
 958                 /* XXX Ugh, we need to get rid of this kind of special case: */
 959                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 960                         fput(op->u.read.rd_filp);
 961
 962                 nfsd4_increment_op_stats(op->opnum);
 963         }
 964
 965         cstate_free(cstate);
 966 out:
 967         nfsd4_release_compoundargs(args);
 968         dprintk("nfsv4 compound returned %d\n", ntohl(status));
 969         return status;
 970 }
 971
 972 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 973         [OP_ACCESS] = {
 974                 .op_func = (nfsd4op_func)nfsd4_access,
 975                 .op_name = "OP_ACCESS",
 976         },
 977         [OP_CLOSE] = {
 978                 .op_func = (nfsd4op_func)nfsd4_close,
 979                 .op_name = "OP_CLOSE",
 980         },
 981         [OP_COMMIT] = {
 982                 .op_func = (nfsd4op_func)nfsd4_commit,
 983                 .op_name = "OP_COMMIT",
 984         },
 985         [OP_CREATE] = {
 986                 .op_func = (nfsd4op_func)nfsd4_create,
 987                 .op_name = "OP_CREATE",
 988         },
 989         [OP_DELEGRETURN] = {
 990                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
 991                 .op_name = "OP_DELEGRETURN",
 992         },
 993         [OP_GETATTR] = {
 994                 .op_func = (nfsd4op_func)nfsd4_getattr,
 995                 .op_flags = ALLOWED_ON_ABSENT_FS,
 996                 .op_name = "OP_GETATTR",
 997         },
 998         [OP_GETFH] = {
 999                 .op_func = (nfsd4op_func)nfsd4_getfh,
1000                 .op_name = "OP_GETFH",
1001         },
1002         [OP_LINK] = {
1003                 .op_func = (nfsd4op_func)nfsd4_link,
1004                 .op_name = "OP_LINK",
1005         },
1006         [OP_LOCK] = {
1007                 .op_func = (nfsd4op_func)nfsd4_lock,
1008                 .op_name = "OP_LOCK",
1009         },
1010         [OP_LOCKT] = {
1011                 .op_func = (nfsd4op_func)nfsd4_lockt,
1012                 .op_name = "OP_LOCKT",
1013         },
1014         [OP_LOCKU] = {
1015                 .op_func = (nfsd4op_func)nfsd4_locku,
1016                 .op_name = "OP_LOCKU",
1017         },
1018         [OP_LOOKUP] = {
1019                 .op_func = (nfsd4op_func)nfsd4_lookup,
1020                 .op_name = "OP_LOOKUP",
1021         },
1022         [OP_LOOKUPP] = {
1023                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1024                 .op_name = "OP_LOOKUPP",
1025         },
1026         [OP_NVERIFY] = {
1027                 .op_func = (nfsd4op_func)nfsd4_nverify,
1028                 .op_name = "OP_NVERIFY",
1029         },
1030         [OP_OPEN] = {
1031                 .op_func = (nfsd4op_func)nfsd4_open,
1032                 .op_name = "OP_OPEN",
1033         },
1034         [OP_OPEN_CONFIRM] = {
1035                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1036                 .op_name = "OP_OPEN_CONFIRM",
1037         },
1038         [OP_OPEN_DOWNGRADE] = {
1039                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1040                 .op_name = "OP_OPEN_DOWNGRADE",
1041         },
1042         [OP_PUTFH] = {
1043                 .op_func = (nfsd4op_func)nfsd4_putfh,
1044                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1045                 .op_name = "OP_PUTFH",
1046         },
1047         [OP_PUTPUBFH] = {
1048                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1049                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1050                 .op_name = "OP_PUTPUBFH",
1051         },
1052         [OP_PUTROOTFH] = {
1053                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1054                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1055                 .op_name = "OP_PUTROOTFH",
1056         },
1057         [OP_READ] = {
1058                 .op_func = (nfsd4op_func)nfsd4_read,
1059                 .op_name = "OP_READ",
1060         },
1061         [OP_READDIR] = {
1062                 .op_func = (nfsd4op_func)nfsd4_readdir,
1063                 .op_name = "OP_READDIR",
1064         },
1065         [OP_READLINK] = {
1066                 .op_func = (nfsd4op_func)nfsd4_readlink,
1067                 .op_name = "OP_READLINK",
1068         },
1069         [OP_REMOVE] = {
1070                 .op_func = (nfsd4op_func)nfsd4_remove,
1071                 .op_name = "OP_REMOVE",
1072         },
1073         [OP_RENAME] = {
1074                 .op_name = "OP_RENAME",
1075                 .op_func = (nfsd4op_func)nfsd4_rename,
1076         },
1077         [OP_RENEW] = {
1078                 .op_func = (nfsd4op_func)nfsd4_renew,
1079                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1080                 .op_name = "OP_RENEW",
1081         },
1082         [OP_RESTOREFH] = {
1083                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1084                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1085                 .op_name = "OP_RESTOREFH",
1086         },
1087         [OP_SAVEFH] = {
1088                 .op_func = (nfsd4op_func)nfsd4_savefh,
1089                 .op_name = "OP_SAVEFH",
1090         },
1091         [OP_SECINFO] = {
1092                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1093                 .op_name = "OP_SECINFO",
1094         },
1095         [OP_SETATTR] = {
1096                 .op_func = (nfsd4op_func)nfsd4_setattr,
1097                 .op_name = "OP_SETATTR",
1098         },
1099         [OP_SETCLIENTID] = {
1100                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1101                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1102                 .op_name = "OP_SETCLIENTID",
1103         },
1104         [OP_SETCLIENTID_CONFIRM] = {
1105                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1106                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1107                 .op_name = "OP_SETCLIENTID_CONFIRM",
1108         },
1109         [OP_VERIFY] = {
1110                 .op_func = (nfsd4op_func)nfsd4_verify,
1111                 .op_name = "OP_VERIFY",
1112         },
1113         [OP_WRITE] = {
1114                 .op_func = (nfsd4op_func)nfsd4_write,
1115                 .op_name = "OP_WRITE",
1116         },
1117         [OP_RELEASE_LOCKOWNER] = {
1118                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1119                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1120                 .op_name = "OP_RELEASE_LOCKOWNER",
1121         },
1122 };
1123
1124 static const char *nfsd4_op_name(unsigned opnum)
1125 {
1126         if (opnum < ARRAY_SIZE(nfsd4_ops))
1127                 return nfsd4_ops[opnum].op_name;
1128         return "unknown_operation";
1129 }
1130
1131 #define nfs4svc_decode_voidargs         NULL
1132 #define nfs4svc_release_void            NULL
1133 #define nfsd4_voidres                   nfsd4_voidargs
1134 #define nfs4svc_release_compound        NULL
1135 struct nfsd4_voidargs { int dummy; };
1136
1137 #define PROC(name, argt, rest, relt, cache, respsize)   \
1138  { (svc_procfunc) nfsd4_proc_##name,            \
1139    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1140    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1141    (kxdrproc_t) nfs4svc_release_##relt,         \
1142    sizeof(struct nfsd4_##argt##args),           \
1143    sizeof(struct nfsd4_##rest##res),            \
1144    0,                                           \
1145    cache,                                       \
1146    respsize,                                    \
1147  }
1148
1149 /*
1150  * TODO: At the present time, the NFSv4 server does not do XID caching
1151  * of requests.  Implementing XID caching would not be a serious problem,
1152  * although it would require a mild change in interfaces since one
1153  * doesn't know whether an NFSv4 request is idempotent until after the
1154  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1155  * Astrand's regression testsuite for NFSv4 servers), which reuses
1156  * XID's liberally, so I've left it unimplemented until pynfs generates
1157  * better XID's.
1158  */
1159 static struct svc_procedure             nfsd_procedures4[2] = {
1160   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1161   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1162 };
1163
1164 struct svc_version      nfsd_version4 = {
1165                 .vs_vers        = 4,
1166                 .vs_nproc       = 2,
1167                 .vs_proc        = nfsd_procedures4,
1168                 .vs_dispatch    = nfsd_dispatch,
1169                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1170 };
1171
1172 /*
1173  * Local variables:
1174  *  c-basic-offset: 8
1175  * End:
1176  */