fs/nfsd/nfs4proc.c

   1 /*
   2  *  fs/nfsd/nfs4proc.c
   3  *
   4  *  Server-side procedures for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Note: some routines in this file are just trivial wrappers
  38  * (e.g. nfsd4_lookup()) defined solely for the sake of consistent
  39  * naming.  Since all such routines have been declared "inline",
  40  * there shouldn't be any associated overhead.  At some point in
  41  * the future, I might inline these "by hand" to clean up a
  42  * little.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/major.h>
  47 #include <linux/slab.h>
  48 #include <linux/file.h>
  49
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/nfsd/nfsd.h>
  52 #include <linux/nfsd/cache.h>
  53 #include <linux/nfs4.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfs4_acl.h>
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  59
  60 static inline void
  61 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  62 {
  63         fh_put(dst);
  64         dget(src->fh_dentry);
  65         if (src->fh_export)
  66                 cache_get(&src->fh_export->h);
  67         *dst = *src;
  68 }
  69
  70 static int
  71 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  72 {
  73         int accmode, status;
  74
  75         if (open->op_truncate &&
  76                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  77                 return nfserr_inval;
  78
  79         accmode = MAY_NOP;
  80         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  81                 accmode = MAY_READ;
  82         if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
  83                 accmode |= (MAY_WRITE | MAY_TRUNC);
  84         accmode |= MAY_OWNER_OVERRIDE;
  85
  86         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  87
  88         return status;
  89 }
  90
  91 static int
  92 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  93 {
  94         struct svc_fh resfh;
  95         int status;
  96
  97         fh_init(&resfh, NFS4_FHSIZE);
  98         open->op_truncate = 0;
  99
 100         if (open->op_create) {
 101                 /*
 102                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 103                  * in NFSv4 as in v3.
 104                  */
 105                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 106                                         open->op_fname.len, &open->op_iattr,
 107                                         &resfh, open->op_createmode,
 108                                         (u32 *)open->op_verf.data, &open->op_truncate);
 109         }
 110         else {
 111                 status = nfsd_lookup(rqstp, current_fh,
 112                                      open->op_fname.data, open->op_fname.len, &resfh);
 113                 fh_unlock(current_fh);
 114         }
 115
 116         if (!status) {
 117                 set_change_info(&open->op_cinfo, current_fh);
 118
 119                 /* set reply cache */
 120                 fh_dup2(current_fh, &resfh);
 121                 open->op_stateowner->so_replay.rp_openfh_len =
 122                         resfh.fh_handle.fh_size;
 123                 memcpy(open->op_stateowner->so_replay.rp_openfh,
 124                                 &resfh.fh_handle.fh_base,
 125                                 resfh.fh_handle.fh_size);
 126
 127                 status = do_open_permission(rqstp, current_fh, open);
 128         }
 129
 130         fh_put(&resfh);
 131         return status;
 132 }
 133
 134 static int
 135 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 136 {
 137         int status;
 138
 139         /* Only reclaims from previously confirmed clients are valid */
 140         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 141                 return status;
 142
 143         /* We don't know the target directory, and therefore can not
 144         * set the change info
 145         */
 146
 147         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 148
 149         /* set replay cache */
 150         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 151         memcpy(open->op_stateowner->so_replay.rp_openfh,
 152                 &current_fh->fh_handle.fh_base,
 153                 current_fh->fh_handle.fh_size);
 154
 155         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 156                 (open->op_iattr.ia_size == 0);
 157
 158         status = do_open_permission(rqstp, current_fh, open);
 159
 160         return status;
 161 }
 162
 163
 164 static inline int
 165 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, struct nfs4_stateowner **replay_owner)
 166 {
 167         int status;
 168         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 169                 (int)open->op_fname.len, open->op_fname.data,
 170                 open->op_stateowner);
 171
 172         /* This check required by spec. */
 173         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 174                 return nfserr_inval;
 175
 176         nfs4_lock_state();
 177
 178         /* check seqid for replay. set nfs4_owner */
 179         status = nfsd4_process_open1(open);
 180         if (status == NFSERR_REPLAY_ME) {
 181                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 182                 fh_put(current_fh);
 183                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 184                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 185                                 rp->rp_openfh_len);
 186                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 187                 if (status)
 188                         dprintk("nfsd4_open: replay failed"
 189                                 " restoring previous filehandle\n");
 190                 else
 191                         status = NFSERR_REPLAY_ME;
 192         }
 193         if (status)
 194                 goto out;
 195         switch (open->op_claim_type) {
 196                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 197                         status = nfserr_inval;
 198                         if (open->op_create)
 199                                 goto out;
 200                         /* fall through */
 201                 case NFS4_OPEN_CLAIM_NULL:
 202                         /*
 203                          * (1) set CURRENT_FH to the file being opened,
 204                          * creating it if necessary, (2) set open->op_cinfo,
 205                          * (3) set open->op_truncate if the file is to be
 206                          * truncated after opening, (4) do permission checking.
 207                          */
 208                         status = do_open_lookup(rqstp, current_fh, open);
 209                         if (status)
 210                                 goto out;
 211                         break;
 212                 case NFS4_OPEN_CLAIM_PREVIOUS:
 213                         open->op_stateowner->so_confirmed = 1;
 214                         /*
 215                          * The CURRENT_FH is already set to the file being
 216                          * opened.  (1) set open->op_cinfo, (2) set
 217                          * open->op_truncate if the file is to be truncated
 218                          * after opening, (3) do permission checking.
 219                         */
 220                         status = do_open_fhandle(rqstp, current_fh, open);
 221                         if (status)
 222                                 goto out;
 223                         break;
 224                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 225                         open->op_stateowner->so_confirmed = 1;
 226                         printk("NFSD: unsupported OPEN claim type %d\n",
 227                                 open->op_claim_type);
 228                         status = nfserr_notsupp;
 229                         goto out;
 230                 default:
 231                         printk("NFSD: Invalid OPEN claim type %d\n",
 232                                 open->op_claim_type);
 233                         status = nfserr_inval;
 234                         goto out;
 235         }
 236         /*
 237          * nfsd4_process_open2() does the actual opening of the file.  If
 238          * successful, it (1) truncates the file if open->op_truncate was
 239          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 240          */
 241         status = nfsd4_process_open2(rqstp, current_fh, open);
 242 out:
 243         if (open->op_stateowner) {
 244                 nfs4_get_stateowner(open->op_stateowner);
 245                 *replay_owner = open->op_stateowner;
 246         }
 247         nfs4_unlock_state();
 248         return status;
 249 }
 250
 251 /*
 252  * filehandle-manipulating ops.
 253  */
 254 static inline int
 255 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 256 {
 257         if (!current_fh->fh_dentry)
 258                 return nfserr_nofilehandle;
 259
 260         *getfh = current_fh;
 261         return nfs_ok;
 262 }
 263
 264 static inline int
 265 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 266 {
 267         fh_put(current_fh);
 268         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 269         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 270         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 271 }
 272
 273 static inline int
 274 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 275 {
 276         int status;
 277
 278         fh_put(current_fh);
 279         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 280                               &rqstp->rq_chandle);
 281         if (!status)
 282                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
 283         return status;
 284 }
 285
 286 static inline int
 287 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 288 {
 289         if (!save_fh->fh_dentry)
 290                 return nfserr_restorefh;
 291
 292         fh_dup2(current_fh, save_fh);
 293         return nfs_ok;
 294 }
 295
 296 static inline int
 297 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 298 {
 299         if (!current_fh->fh_dentry)
 300                 return nfserr_nofilehandle;
 301
 302         fh_dup2(save_fh, current_fh);
 303         return nfs_ok;
 304 }
 305
 306 /*
 307  * misc nfsv4 ops
 308  */
 309 static inline int
 310 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 311 {
 312         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 313                 return nfserr_inval;
 314
 315         access->ac_resp_access = access->ac_req_access;
 316         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 317 }
 318
 319 static inline int
 320 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 321 {
 322         int status;
 323
 324         u32 *p = (u32 *)commit->co_verf.data;
 325         *p++ = nfssvc_boot.tv_sec;
 326         *p++ = nfssvc_boot.tv_usec;
 327
 328         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 329         if (status == nfserr_symlink)
 330                 status = nfserr_inval;
 331         return status;
 332 }
 333
 334 static int
 335 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 336 {
 337         struct svc_fh resfh;
 338         int status;
 339         dev_t rdev;
 340
 341         fh_init(&resfh, NFS4_FHSIZE);
 342
 343         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 344         if (status == nfserr_symlink)
 345                 status = nfserr_notdir;
 346         if (status)
 347                 return status;
 348
 349         switch (create->cr_type) {
 350         case NF4LNK:
 351                 /* ugh! we have to null-terminate the linktext, or
 352                  * vfs_symlink() will choke.  it is always safe to
 353                  * null-terminate by brute force, since at worst we
 354                  * will overwrite the first byte of the create namelen
 355                  * in the XDR buffer, which has already been extracted
 356                  * during XDR decode.
 357                  */
 358                 create->cr_linkname[create->cr_linklen] = 0;
 359
 360                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 361                                       create->cr_namelen, create->cr_linkname,
 362                                       create->cr_linklen, &resfh, &create->cr_iattr);
 363                 break;
 364
 365         case NF4BLK:
 366                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 367                 if (MAJOR(rdev) != create->cr_specdata1 ||
 368                     MINOR(rdev) != create->cr_specdata2)
 369                         return nfserr_inval;
 370                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 371                                      create->cr_namelen, &create->cr_iattr,
 372                                      S_IFBLK, rdev, &resfh);
 373                 break;
 374
 375         case NF4CHR:
 376                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 377                 if (MAJOR(rdev) != create->cr_specdata1 ||
 378                     MINOR(rdev) != create->cr_specdata2)
 379                         return nfserr_inval;
 380                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 381                                      create->cr_namelen, &create->cr_iattr,
 382                                      S_IFCHR, rdev, &resfh);
 383                 break;
 384
 385         case NF4SOCK:
 386                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 387                                      create->cr_namelen, &create->cr_iattr,
 388                                      S_IFSOCK, 0, &resfh);
 389                 break;
 390
 391         case NF4FIFO:
 392                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 393                                      create->cr_namelen, &create->cr_iattr,
 394                                      S_IFIFO, 0, &resfh);
 395                 break;
 396
 397         case NF4DIR:
 398                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 399                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 400                                      create->cr_namelen, &create->cr_iattr,
 401                                      S_IFDIR, 0, &resfh);
 402                 break;
 403
 404         default:
 405                 status = nfserr_badtype;
 406         }
 407
 408         if (!status) {
 409                 fh_unlock(current_fh);
 410                 set_change_info(&create->cr_cinfo, current_fh);
 411                 fh_dup2(current_fh, &resfh);
 412         }
 413
 414         fh_put(&resfh);
 415         return status;
 416 }
 417
 418 static inline int
 419 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 420 {
 421         int status;
 422
 423         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 424         if (status)
 425                 return status;
 426
 427         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 428                 return nfserr_inval;
 429
 430         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 431         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 432
 433         getattr->ga_fhp = current_fh;
 434         return nfs_ok;
 435 }
 436
 437 static inline int
 438 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 439            struct svc_fh *save_fh, struct nfsd4_link *link)
 440 {
 441         int status = nfserr_nofilehandle;
 442
 443         if (!save_fh->fh_dentry)
 444                 return status;
 445         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 446         if (!status)
 447                 set_change_info(&link->li_cinfo, current_fh);
 448         return status;
 449 }
 450
 451 static int
 452 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 453 {
 454         struct svc_fh tmp_fh;
 455         int ret;
 456
 457         fh_init(&tmp_fh, NFS4_FHSIZE);
 458         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 459                               &rqstp->rq_chandle)) != 0)
 460                 return ret;
 461         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 462                 fh_put(&tmp_fh);
 463                 return nfserr_noent;
 464         }
 465         fh_put(&tmp_fh);
 466         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 467 }
 468
 469 static inline int
 470 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 471 {
 472         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 473 }
 474
 475 static inline int
 476 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 477 {
 478         int status;
 479
 480         /* no need to check permission - this will be done in nfsd_read() */
 481
 482         read->rd_filp = NULL;
 483         if (read->rd_offset >= OFFSET_MAX)
 484                 return nfserr_inval;
 485
 486         nfs4_lock_state();
 487         /* check stateid */
 488         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 489                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 490                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 491                 goto out;
 492         }
 493         if (read->rd_filp)
 494                 get_file(read->rd_filp);
 495         status = nfs_ok;
 496 out:
 497         nfs4_unlock_state();
 498         read->rd_rqstp = rqstp;
 499         read->rd_fhp = current_fh;
 500         return status;
 501 }
 502
 503 static inline int
 504 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 505 {
 506         u64 cookie = readdir->rd_cookie;
 507         static const nfs4_verifier zeroverf;
 508
 509         /* no need to check permission - this will be done in nfsd_readdir() */
 510
 511         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 512                 return nfserr_inval;
 513
 514         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 515         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 516
 517         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 518             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 519                 return nfserr_bad_cookie;
 520
 521         readdir->rd_rqstp = rqstp;
 522         readdir->rd_fhp = current_fh;
 523         return nfs_ok;
 524 }
 525
 526 static inline int
 527 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 528 {
 529         readlink->rl_rqstp = rqstp;
 530         readlink->rl_fhp = current_fh;
 531         return nfs_ok;
 532 }
 533
 534 static inline int
 535 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 536 {
 537         int status;
 538
 539         if (nfs4_in_grace())
 540                 return nfserr_grace;
 541         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 542         if (status == nfserr_symlink)
 543                 return nfserr_notdir;
 544         if (!status) {
 545                 fh_unlock(current_fh);
 546                 set_change_info(&remove->rm_cinfo, current_fh);
 547         }
 548         return status;
 549 }
 550
 551 static inline int
 552 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 553              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 554 {
 555         int status = nfserr_nofilehandle;
 556
 557         if (!save_fh->fh_dentry)
 558                 return status;
 559         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 560                                         & NFSEXP_NOSUBTREECHECK))
 561                 return nfserr_grace;
 562         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 563                              rename->rn_snamelen, current_fh,
 564                              rename->rn_tname, rename->rn_tnamelen);
 565
 566         /* the underlying filesystem returns different error's than required
 567          * by NFSv4. both save_fh and current_fh have been verified.. */
 568         if (status == nfserr_isdir)
 569                 status = nfserr_exist;
 570         else if ((status == nfserr_notdir) &&
 571                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 572                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 573                 status = nfserr_exist;
 574         else if (status == nfserr_symlink)
 575                 status = nfserr_notdir;
 576
 577         if (!status) {
 578                 set_change_info(&rename->rn_sinfo, current_fh);
 579                 set_change_info(&rename->rn_tinfo, save_fh);
 580         }
 581         return status;
 582 }
 583
 584 static inline int
 585 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 586 {
 587         int status = nfs_ok;
 588
 589         if (!current_fh->fh_dentry)
 590                 return nfserr_nofilehandle;
 591
 592         status = nfs_ok;
 593         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 594                 nfs4_lock_state();
 595                 status = nfs4_preprocess_stateid_op(current_fh,
 596                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 597                 nfs4_unlock_state();
 598                 if (status) {
 599                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!");
 600                         return status;
 601                 }
 602         }
 603         status = nfs_ok;
 604         if (setattr->sa_acl != NULL)
 605                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 606         if (status)
 607                 return status;
 608         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 609                                 0, (time_t)0);
 610         return status;
 611 }
 612
 613 static inline int
 614 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 615 {
 616         stateid_t *stateid = &write->wr_stateid;
 617         struct file *filp = NULL;
 618         u32 *p;
 619         int status = nfs_ok;
 620
 621         /* no need to check permission - this will be done in nfsd_write() */
 622
 623         if (write->wr_offset >= OFFSET_MAX)
 624                 return nfserr_inval;
 625
 626         nfs4_lock_state();
 627         status = nfs4_preprocess_stateid_op(current_fh, stateid,
 628                                         CHECK_FH | WR_STATE, &filp);
 629         if (filp)
 630                 get_file(filp);
 631         nfs4_unlock_state();
 632
 633         if (status) {
 634                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 635                 return status;
 636         }
 637
 638         write->wr_bytes_written = write->wr_buflen;
 639         write->wr_how_written = write->wr_stable_how;
 640         p = (u32 *)write->wr_verifier.data;
 641         *p++ = nfssvc_boot.tv_sec;
 642         *p++ = nfssvc_boot.tv_usec;
 643
 644         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
 645                         write->wr_vec, write->wr_vlen, write->wr_buflen,
 646                         &write->wr_how_written);
 647         if (filp)
 648                 fput(filp);
 649
 650         if (status == nfserr_symlink)
 651                 status = nfserr_inval;
 652         return status;
 653 }
 654
 655 /* This routine never returns NFS_OK!  If there are no other errors, it
 656  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 657  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 658  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 659  */
 660 static int
 661 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 662 {
 663         u32 *buf, *p;
 664         int count;
 665         int status;
 666
 667         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 668         if (status)
 669                 return status;
 670
 671         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 672             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 673                 return nfserr_attrnotsupp;
 674         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 675             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 676                 return nfserr_inval;
 677         if (verify->ve_attrlen & 3)
 678                 return nfserr_inval;
 679
 680         /* count in words:
 681          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 682          */
 683         count = 4 + (verify->ve_attrlen >> 2);
 684         buf = kmalloc(count << 2, GFP_KERNEL);
 685         if (!buf)
 686                 return nfserr_resource;
 687
 688         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 689                                     current_fh->fh_dentry, buf,
 690                                     &count, verify->ve_bmval,
 691                                     rqstp);
 692
 693         /* this means that nfsd4_encode_fattr() ran out of space */
 694         if (status == nfserr_resource && count == 0)
 695                 status = nfserr_not_same;
 696         if (status)
 697                 goto out_kfree;
 698
 699         p = buf + 3;
 700         status = nfserr_not_same;
 701         if (ntohl(*p++) != verify->ve_attrlen)
 702                 goto out_kfree;
 703         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 704                 status = nfserr_same;
 705
 706 out_kfree:
 707         kfree(buf);
 708         return status;
 709 }
 710
 711 /*
 712  * NULL call.
 713  */
 714 static int
 715 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 716 {
 717         return nfs_ok;
 718 }
 719
 720
 721 /*
 722  * COMPOUND call.
 723  */
 724 static int
 725 nfsd4_proc_compound(struct svc_rqst *rqstp,
 726                     struct nfsd4_compoundargs *args,
 727                     struct nfsd4_compoundres *resp)
 728 {
 729         struct nfsd4_op *op;
 730         struct svc_fh   *current_fh = NULL;
 731         struct svc_fh   *save_fh = NULL;
 732         struct nfs4_stateowner *replay_owner = NULL;
 733         int             slack_space;    /* in words, not bytes! */
 734         int             status;
 735
 736         status = nfserr_resource;
 737         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 738         if (current_fh == NULL)
 739                 goto out;
 740         fh_init(current_fh, NFS4_FHSIZE);
 741         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 742         if (save_fh == NULL)
 743                 goto out;
 744         fh_init(save_fh, NFS4_FHSIZE);
 745
 746         resp->xbuf = &rqstp->rq_res;
 747         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 748         resp->tagp = resp->p;
 749         /* reserve space for: taglen, tag, and opcnt */
 750         resp->p += 2 + XDR_QUADLEN(args->taglen);
 751         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 752         resp->taglen = args->taglen;
 753         resp->tag = args->tag;
 754         resp->opcnt = 0;
 755         resp->rqstp = rqstp;
 756
 757         /*
 758          * According to RFC3010, this takes precedence over all other errors.
 759          */
 760         status = nfserr_minor_vers_mismatch;
 761         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 762                 goto out;
 763
 764         status = nfs_ok;
 765         while (!status && resp->opcnt < args->opcnt) {
 766                 op = &args->ops[resp->opcnt++];
 767
 768                 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
 769
 770                 /*
 771                  * The XDR decode routines may have pre-set op->status;
 772                  * for example, if there is a miscellaneous XDR error
 773                  * it will be set to nfserr_bad_xdr.
 774                  */
 775                 if (op->status)
 776                         goto encode_op;
 777
 778                 /* We must be able to encode a successful response to
 779                  * this operation, with enough room left over to encode a
 780                  * failed response to the next operation.  If we don't
 781                  * have enough room, fail with ERR_RESOURCE.
 782                  */
 783 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 784                 slack_space = (char *)resp->end - (char *)resp->p;
 785                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 786                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 787                         op->status = nfserr_resource;
 788                         goto encode_op;
 789                 }
 790
 791                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 792                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 793                 * require a valid current filehandle
 794                 *
 795                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 796                 * due to required returned bitmap argument
 797                 */
 798                 if ((!current_fh->fh_dentry) &&
 799                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 800                    (op->opnum == OP_SETCLIENTID) ||
 801                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 802                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 803                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 804                    (op->opnum == OP_SETATTR))) {
 805                         op->status = nfserr_nofilehandle;
 806                         goto encode_op;
 807                 }
 808                 switch (op->opnum) {
 809                 case OP_ACCESS:
 810                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 811                         break;
 812                 case OP_CLOSE:
 813                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
 814                         break;
 815                 case OP_COMMIT:
 816                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 817                         break;
 818                 case OP_CREATE:
 819                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 820                         break;
 821                 case OP_DELEGRETURN:
 822                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 823                         break;
 824                 case OP_GETATTR:
 825                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 826                         break;
 827                 case OP_GETFH:
 828                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 829                         break;
 830                 case OP_LINK:
 831                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 832                         break;
 833                 case OP_LOCK:
 834                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
 835                         break;
 836                 case OP_LOCKT:
 837                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 838                         break;
 839                 case OP_LOCKU:
 840                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner);
 841                         break;
 842                 case OP_LOOKUP:
 843                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 844                         break;
 845                 case OP_LOOKUPP:
 846                         op->status = nfsd4_lookupp(rqstp, current_fh);
 847                         break;
 848                 case OP_NVERIFY:
 849                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 850                         if (op->status == nfserr_not_same)
 851                                 op->status = nfs_ok;
 852                         break;
 853                 case OP_OPEN:
 854                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner);
 855                         break;
 856                 case OP_OPEN_CONFIRM:
 857                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
 858                         break;
 859                 case OP_OPEN_DOWNGRADE:
 860                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
 861                         break;
 862                 case OP_PUTFH:
 863                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 864                         break;
 865                 case OP_PUTROOTFH:
 866                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 867                         break;
 868                 case OP_READ:
 869                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 870                         break;
 871                 case OP_READDIR:
 872                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 873                         break;
 874                 case OP_READLINK:
 875                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 876                         break;
 877                 case OP_REMOVE:
 878                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 879                         break;
 880                 case OP_RENAME:
 881                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 882                         break;
 883                 case OP_RENEW:
 884                         op->status = nfsd4_renew(&op->u.renew);
 885                         break;
 886                 case OP_RESTOREFH:
 887                         op->status = nfsd4_restorefh(current_fh, save_fh);
 888                         break;
 889                 case OP_SAVEFH:
 890                         op->status = nfsd4_savefh(current_fh, save_fh);
 891                         break;
 892                 case OP_SETATTR:
 893                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 894                         break;
 895                 case OP_SETCLIENTID:
 896                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 897                         break;
 898                 case OP_SETCLIENTID_CONFIRM:
 899                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 900                         break;
 901                 case OP_VERIFY:
 902                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 903                         if (op->status == nfserr_same)
 904                                 op->status = nfs_ok;
 905                         break;
 906                 case OP_WRITE:
 907                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 908                         break;
 909                 case OP_RELEASE_LOCKOWNER:
 910                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 911                         break;
 912                 default:
 913                         BUG_ON(op->status == nfs_ok);
 914                         break;
 915                 }
 916
 917 encode_op:
 918                 if (op->status == NFSERR_REPLAY_ME) {
 919                         op->replay = &replay_owner->so_replay;
 920                         nfsd4_encode_replay(resp, op);
 921                         status = op->status = op->replay->rp_status;
 922                 } else {
 923                         nfsd4_encode_operation(resp, op);
 924                         status = op->status;
 925                 }
 926                 if (replay_owner && (replay_owner != (void *)(-1))) {
 927                         nfs4_put_stateowner(replay_owner);
 928                         replay_owner = NULL;
 929                 }
 930                 /* XXX Ugh, we need to get rid of this kind of special case: */
 931                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 932                         fput(op->u.read.rd_filp);
 933         }
 934
 935 out:
 936         nfsd4_release_compoundargs(args);
 937         if (current_fh)
 938                 fh_put(current_fh);
 939         kfree(current_fh);
 940         if (save_fh)
 941                 fh_put(save_fh);
 942         kfree(save_fh);
 943         return status;
 944 }
 945
 946 #define nfs4svc_decode_voidargs         NULL
 947 #define nfs4svc_release_void            NULL
 948 #define nfsd4_voidres                   nfsd4_voidargs
 949 #define nfs4svc_release_compound        NULL
 950 struct nfsd4_voidargs { int dummy; };
 951
 952 #define PROC(name, argt, rest, relt, cache, respsize)   \
 953  { (svc_procfunc) nfsd4_proc_##name,            \
 954    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 955    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 956    (kxdrproc_t) nfs4svc_release_##relt,         \
 957    sizeof(struct nfsd4_##argt##args),           \
 958    sizeof(struct nfsd4_##rest##res),            \
 959    0,                                           \
 960    cache,                                       \
 961    respsize,                                    \
 962  }
 963
 964 /*
 965  * TODO: At the present time, the NFSv4 server does not do XID caching
 966  * of requests.  Implementing XID caching would not be a serious problem,
 967  * although it would require a mild change in interfaces since one
 968  * doesn't know whether an NFSv4 request is idempotent until after the
 969  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 970  * Astrand's regression testsuite for NFSv4 servers), which reuses
 971  * XID's liberally, so I've left it unimplemented until pynfs generates
 972  * better XID's.
 973  */
 974 static struct svc_procedure             nfsd_procedures4[2] = {
 975   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 976   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
 977 };
 978
 979 struct svc_version      nfsd_version4 = {
 980                 .vs_vers        = 4,
 981                 .vs_nproc       = 2,
 982                 .vs_proc        = nfsd_procedures4,
 983                 .vs_dispatch    = nfsd_dispatch,
 984                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
 985 };
 986
 987 /*
 988  * Local variables:
 989  *  c-basic-offset: 8
 990  * End:
 991  */