git.oblomov.eu Git - linux-2.6/blob - 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                         /*
 214                          * The CURRENT_FH is already set to the file being
 215                          * opened.  (1) set open->op_cinfo, (2) set
 216                          * open->op_truncate if the file is to be truncated
 217                          * after opening, (3) do permission checking.
 218                         */
 219                         status = do_open_fhandle(rqstp, current_fh, open);
 220                         if (status)
 221                                 goto out;
 222                         break;
 223                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 224                         printk("NFSD: unsupported OPEN claim type %d\n",
 225                                 open->op_claim_type);
 226                         status = nfserr_notsupp;
 227                         goto out;
 228                 default:
 229                         printk("NFSD: Invalid OPEN claim type %d\n",
 230                                 open->op_claim_type);
 231                         status = nfserr_inval;
 232                         goto out;
 233         }
 234         /*
 235          * nfsd4_process_open2() does the actual opening of the file.  If
 236          * successful, it (1) truncates the file if open->op_truncate was
 237          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 238          */
 239         status = nfsd4_process_open2(rqstp, current_fh, open);
 240 out:
 241         if (open->op_stateowner) {
 242                 nfs4_get_stateowner(open->op_stateowner);
 243                 *replay_owner = open->op_stateowner;
 244         }
 245         nfs4_unlock_state();
 246         return status;
 247 }
 248
 249 /*
 250  * filehandle-manipulating ops.
 251  */
 252 static inline int
 253 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 254 {
 255         if (!current_fh->fh_dentry)
 256                 return nfserr_nofilehandle;
 257
 258         *getfh = current_fh;
 259         return nfs_ok;
 260 }
 261
 262 static inline int
 263 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 264 {
 265         fh_put(current_fh);
 266         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 267         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 268         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 269 }
 270
 271 static inline int
 272 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 273 {
 274         int status;
 275
 276         fh_put(current_fh);
 277         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 278                               &rqstp->rq_chandle);
 279         if (!status)
 280                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
 281         return status;
 282 }
 283
 284 static inline int
 285 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 286 {
 287         if (!save_fh->fh_dentry)
 288                 return nfserr_restorefh;
 289
 290         fh_dup2(current_fh, save_fh);
 291         return nfs_ok;
 292 }
 293
 294 static inline int
 295 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 296 {
 297         if (!current_fh->fh_dentry)
 298                 return nfserr_nofilehandle;
 299
 300         fh_dup2(save_fh, current_fh);
 301         return nfs_ok;
 302 }
 303
 304 /*
 305  * misc nfsv4 ops
 306  */
 307 static inline int
 308 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 309 {
 310         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 311                 return nfserr_inval;
 312
 313         access->ac_resp_access = access->ac_req_access;
 314         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 315 }
 316
 317 static inline int
 318 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 319 {
 320         int status;
 321
 322         u32 *p = (u32 *)commit->co_verf.data;
 323         *p++ = nfssvc_boot.tv_sec;
 324         *p++ = nfssvc_boot.tv_usec;
 325
 326         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 327         if (status == nfserr_symlink)
 328                 status = nfserr_inval;
 329         return status;
 330 }
 331
 332 static int
 333 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 334 {
 335         struct svc_fh resfh;
 336         int status;
 337         dev_t rdev;
 338
 339         fh_init(&resfh, NFS4_FHSIZE);
 340
 341         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 342         if (status == nfserr_symlink)
 343                 status = nfserr_notdir;
 344         if (status)
 345                 return status;
 346
 347         switch (create->cr_type) {
 348         case NF4LNK:
 349                 /* ugh! we have to null-terminate the linktext, or
 350                  * vfs_symlink() will choke.  it is always safe to
 351                  * null-terminate by brute force, since at worst we
 352                  * will overwrite the first byte of the create namelen
 353                  * in the XDR buffer, which has already been extracted
 354                  * during XDR decode.
 355                  */
 356                 create->cr_linkname[create->cr_linklen] = 0;
 357
 358                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 359                                       create->cr_namelen, create->cr_linkname,
 360                                       create->cr_linklen, &resfh, &create->cr_iattr);
 361                 break;
 362
 363         case NF4BLK:
 364                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 365                 if (MAJOR(rdev) != create->cr_specdata1 ||
 366                     MINOR(rdev) != create->cr_specdata2)
 367                         return nfserr_inval;
 368                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 369                                      create->cr_namelen, &create->cr_iattr,
 370                                      S_IFBLK, rdev, &resfh);
 371                 break;
 372
 373         case NF4CHR:
 374                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 375                 if (MAJOR(rdev) != create->cr_specdata1 ||
 376                     MINOR(rdev) != create->cr_specdata2)
 377                         return nfserr_inval;
 378                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 379                                      create->cr_namelen, &create->cr_iattr,
 380                                      S_IFCHR, rdev, &resfh);
 381                 break;
 382
 383         case NF4SOCK:
 384                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 385                                      create->cr_namelen, &create->cr_iattr,
 386                                      S_IFSOCK, 0, &resfh);
 387                 break;
 388
 389         case NF4FIFO:
 390                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 391                                      create->cr_namelen, &create->cr_iattr,
 392                                      S_IFIFO, 0, &resfh);
 393                 break;
 394
 395         case NF4DIR:
 396                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 397                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 398                                      create->cr_namelen, &create->cr_iattr,
 399                                      S_IFDIR, 0, &resfh);
 400                 break;
 401
 402         default:
 403                 status = nfserr_badtype;
 404         }
 405
 406         if (!status) {
 407                 fh_unlock(current_fh);
 408                 set_change_info(&create->cr_cinfo, current_fh);
 409                 fh_dup2(current_fh, &resfh);
 410         }
 411
 412         fh_put(&resfh);
 413         return status;
 414 }
 415
 416 static inline int
 417 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 418 {
 419         int status;
 420
 421         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 422         if (status)
 423                 return status;
 424
 425         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 426                 return nfserr_inval;
 427
 428         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 429         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 430
 431         getattr->ga_fhp = current_fh;
 432         return nfs_ok;
 433 }
 434
 435 static inline int
 436 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 437            struct svc_fh *save_fh, struct nfsd4_link *link)
 438 {
 439         int status = nfserr_nofilehandle;
 440
 441         if (!save_fh->fh_dentry)
 442                 return status;
 443         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 444         if (!status)
 445                 set_change_info(&link->li_cinfo, current_fh);
 446         return status;
 447 }
 448
 449 static int
 450 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 451 {
 452         struct svc_fh tmp_fh;
 453         int ret;
 454
 455         fh_init(&tmp_fh, NFS4_FHSIZE);
 456         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 457                               &rqstp->rq_chandle)) != 0)
 458                 return ret;
 459         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 460                 fh_put(&tmp_fh);
 461                 return nfserr_noent;
 462         }
 463         fh_put(&tmp_fh);
 464         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 465 }
 466
 467 static inline int
 468 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 469 {
 470         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 471 }
 472
 473 static inline int
 474 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 475 {
 476         int status;
 477
 478         /* no need to check permission - this will be done in nfsd_read() */
 479
 480         read->rd_filp = NULL;
 481         if (read->rd_offset >= OFFSET_MAX)
 482                 return nfserr_inval;
 483
 484         nfs4_lock_state();
 485         /* check stateid */
 486         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 487                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 488                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 489                 goto out;
 490         }
 491         if (read->rd_filp)
 492                 get_file(read->rd_filp);
 493         status = nfs_ok;
 494 out:
 495         nfs4_unlock_state();
 496         read->rd_rqstp = rqstp;
 497         read->rd_fhp = current_fh;
 498         return status;
 499 }
 500
 501 static inline int
 502 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 503 {
 504         u64 cookie = readdir->rd_cookie;
 505         static const nfs4_verifier zeroverf;
 506
 507         /* no need to check permission - this will be done in nfsd_readdir() */
 508
 509         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 510                 return nfserr_inval;
 511
 512         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 513         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 514
 515         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 516             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 517                 return nfserr_bad_cookie;
 518
 519         readdir->rd_rqstp = rqstp;
 520         readdir->rd_fhp = current_fh;
 521         return nfs_ok;
 522 }
 523
 524 static inline int
 525 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 526 {
 527         readlink->rl_rqstp = rqstp;
 528         readlink->rl_fhp = current_fh;
 529         return nfs_ok;
 530 }
 531
 532 static inline int
 533 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 534 {
 535         int status;
 536
 537         if (nfs4_in_grace())
 538                 return nfserr_grace;
 539         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 540         if (status == nfserr_symlink)
 541                 return nfserr_notdir;
 542         if (!status) {
 543                 fh_unlock(current_fh);
 544                 set_change_info(&remove->rm_cinfo, current_fh);
 545         }
 546         return status;
 547 }
 548
 549 static inline int
 550 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 551              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 552 {
 553         int status = nfserr_nofilehandle;
 554
 555         if (!save_fh->fh_dentry)
 556                 return status;
 557         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 558                                         & NFSEXP_NOSUBTREECHECK))
 559                 return nfserr_grace;
 560         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 561                              rename->rn_snamelen, current_fh,
 562                              rename->rn_tname, rename->rn_tnamelen);
 563
 564         /* the underlying filesystem returns different error's than required
 565          * by NFSv4. both save_fh and current_fh have been verified.. */
 566         if (status == nfserr_isdir)
 567                 status = nfserr_exist;
 568         else if ((status == nfserr_notdir) &&
 569                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 570                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 571                 status = nfserr_exist;
 572         else if (status == nfserr_symlink)
 573                 status = nfserr_notdir;
 574
 575         if (!status) {
 576                 set_change_info(&rename->rn_sinfo, current_fh);
 577                 set_change_info(&rename->rn_tinfo, save_fh);
 578         }
 579         return status;
 580 }
 581
 582 static inline int
 583 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 584 {
 585         int status = nfs_ok;
 586
 587         if (!current_fh->fh_dentry)
 588                 return nfserr_nofilehandle;
 589
 590         status = nfs_ok;
 591         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 592                 nfs4_lock_state();
 593                 if ((status = nfs4_preprocess_stateid_op(current_fh,
 594                                                 &setattr->sa_stateid,
 595                                                 CHECK_FH | WR_STATE, NULL))) {
 596                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 597                         goto out_unlock;
 598                 }
 599                 nfs4_unlock_state();
 600         }
 601         status = nfs_ok;
 602         if (setattr->sa_acl != NULL)
 603                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 604         if (status)
 605                 goto out;
 606         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 607                                 0, (time_t)0);
 608 out:
 609         return status;
 610 out_unlock:
 611         nfs4_unlock_state();
 612         return status;
 613 }
 614
 615 static inline int
 616 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 617 {
 618         stateid_t *stateid = &write->wr_stateid;
 619         struct file *filp = NULL;
 620         u32 *p;
 621         int status = nfs_ok;
 622
 623         /* no need to check permission - this will be done in nfsd_write() */
 624
 625         if (write->wr_offset >= OFFSET_MAX)
 626                 return nfserr_inval;
 627
 628         nfs4_lock_state();
 629         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
 630                                         CHECK_FH | WR_STATE, &filp))) {
 631                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 632                 goto out;
 633         }
 634         if (filp)
 635                 get_file(filp);
 636         nfs4_unlock_state();
 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 out:
 654         nfs4_unlock_state();
 655         return status;
 656 }
 657
 658 /* This routine never returns NFS_OK!  If there are no other errors, it
 659  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 660  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 661  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 662  */
 663 static int
 664 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 665 {
 666         u32 *buf, *p;
 667         int count;
 668         int status;
 669
 670         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 671         if (status)
 672                 return status;
 673
 674         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 675             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 676                 return nfserr_attrnotsupp;
 677         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 678             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 679                 return nfserr_inval;
 680         if (verify->ve_attrlen & 3)
 681                 return nfserr_inval;
 682
 683         /* count in words:
 684          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 685          */
 686         count = 4 + (verify->ve_attrlen >> 2);
 687         buf = kmalloc(count << 2, GFP_KERNEL);
 688         if (!buf)
 689                 return nfserr_resource;
 690
 691         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 692                                     current_fh->fh_dentry, buf,
 693                                     &count, verify->ve_bmval,
 694                                     rqstp);
 695
 696         /* this means that nfsd4_encode_fattr() ran out of space */
 697         if (status == nfserr_resource && count == 0)
 698                 status = nfserr_not_same;
 699         if (status)
 700                 goto out_kfree;
 701
 702         p = buf + 3;
 703         status = nfserr_not_same;
 704         if (ntohl(*p++) != verify->ve_attrlen)
 705                 goto out_kfree;
 706         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 707                 status = nfserr_same;
 708
 709 out_kfree:
 710         kfree(buf);
 711         return status;
 712 }
 713
 714 /*
 715  * NULL call.
 716  */
 717 static int
 718 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 719 {
 720         return nfs_ok;
 721 }
 722
 723
 724 /*
 725  * COMPOUND call.
 726  */
 727 static int
 728 nfsd4_proc_compound(struct svc_rqst *rqstp,
 729                     struct nfsd4_compoundargs *args,
 730                     struct nfsd4_compoundres *resp)
 731 {
 732         struct nfsd4_op *op;
 733         struct svc_fh   *current_fh = NULL;
 734         struct svc_fh   *save_fh = NULL;
 735         struct nfs4_stateowner *replay_owner = NULL;
 736         int             slack_space;    /* in words, not bytes! */
 737         int             status;
 738
 739         status = nfserr_resource;
 740         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 741         if (current_fh == NULL)
 742                 goto out;
 743         fh_init(current_fh, NFS4_FHSIZE);
 744         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 745         if (save_fh == NULL)
 746                 goto out;
 747         fh_init(save_fh, NFS4_FHSIZE);
 748
 749         resp->xbuf = &rqstp->rq_res;
 750         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 751         resp->tagp = resp->p;
 752         /* reserve space for: taglen, tag, and opcnt */
 753         resp->p += 2 + XDR_QUADLEN(args->taglen);
 754         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 755         resp->taglen = args->taglen;
 756         resp->tag = args->tag;
 757         resp->opcnt = 0;
 758         resp->rqstp = rqstp;
 759
 760         /*
 761          * According to RFC3010, this takes precedence over all other errors.
 762          */
 763         status = nfserr_minor_vers_mismatch;
 764         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 765                 goto out;
 766
 767         status = nfs_ok;
 768         while (!status && resp->opcnt < args->opcnt) {
 769                 op = &args->ops[resp->opcnt++];
 770
 771                 /*
 772                  * The XDR decode routines may have pre-set op->status;
 773                  * for example, if there is a miscellaneous XDR error
 774                  * it will be set to nfserr_bad_xdr.
 775                  */
 776                 if (op->status)
 777                         goto encode_op;
 778
 779                 /* We must be able to encode a successful response to
 780                  * this operation, with enough room left over to encode a
 781                  * failed response to the next operation.  If we don't
 782                  * have enough room, fail with ERR_RESOURCE.
 783                  */
 784 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 785                 slack_space = (char *)resp->end - (char *)resp->p;
 786                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 787                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 788                         op->status = nfserr_resource;
 789                         goto encode_op;
 790                 }
 791
 792                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 793                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 794                 * require a valid current filehandle
 795                 *
 796                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 797                 * due to required returned bitmap argument
 798                 */
 799                 if ((!current_fh->fh_dentry) &&
 800                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 801                    (op->opnum == OP_SETCLIENTID) ||
 802                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 803                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 804                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 805                    (op->opnum == OP_SETATTR))) {
 806                         op->status = nfserr_nofilehandle;
 807                         goto encode_op;
 808                 }
 809                 switch (op->opnum) {
 810                 case OP_ACCESS:
 811                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 812                         break;
 813                 case OP_CLOSE:
 814                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
 815                         break;
 816                 case OP_COMMIT:
 817                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 818                         break;
 819                 case OP_CREATE:
 820                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 821                         break;
 822                 case OP_DELEGRETURN:
 823                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 824                         break;
 825                 case OP_GETATTR:
 826                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 827                         break;
 828                 case OP_GETFH:
 829                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 830                         break;
 831                 case OP_LINK:
 832                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 833                         break;
 834                 case OP_LOCK:
 835                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
 836                         break;
 837                 case OP_LOCKT:
 838                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 839                         break;
 840                 case OP_LOCKU:
 841                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner);
 842                         break;
 843                 case OP_LOOKUP:
 844                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 845                         break;
 846                 case OP_LOOKUPP:
 847                         op->status = nfsd4_lookupp(rqstp, current_fh);
 848                         break;
 849                 case OP_NVERIFY:
 850                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 851                         if (op->status == nfserr_not_same)
 852                                 op->status = nfs_ok;
 853                         break;
 854                 case OP_OPEN:
 855                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner);
 856                         break;
 857                 case OP_OPEN_CONFIRM:
 858                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
 859                         break;
 860                 case OP_OPEN_DOWNGRADE:
 861                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
 862                         break;
 863                 case OP_PUTFH:
 864                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 865                         break;
 866                 case OP_PUTROOTFH:
 867                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 868                         break;
 869                 case OP_READ:
 870                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 871                         break;
 872                 case OP_READDIR:
 873                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 874                         break;
 875                 case OP_READLINK:
 876                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 877                         break;
 878                 case OP_REMOVE:
 879                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 880                         break;
 881                 case OP_RENAME:
 882                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 883                         break;
 884                 case OP_RENEW:
 885                         op->status = nfsd4_renew(&op->u.renew);
 886                         break;
 887                 case OP_RESTOREFH:
 888                         op->status = nfsd4_restorefh(current_fh, save_fh);
 889                         break;
 890                 case OP_SAVEFH:
 891                         op->status = nfsd4_savefh(current_fh, save_fh);
 892                         break;
 893                 case OP_SETATTR:
 894                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 895                         break;
 896                 case OP_SETCLIENTID:
 897                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 898                         break;
 899                 case OP_SETCLIENTID_CONFIRM:
 900                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 901                         break;
 902                 case OP_VERIFY:
 903                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 904                         if (op->status == nfserr_same)
 905                                 op->status = nfs_ok;
 906                         break;
 907                 case OP_WRITE:
 908                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 909                         break;
 910                 case OP_RELEASE_LOCKOWNER:
 911                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 912                         break;
 913                 default:
 914                         BUG_ON(op->status == nfs_ok);
 915                         break;
 916                 }
 917
 918 encode_op:
 919                 if (op->status == NFSERR_REPLAY_ME) {
 920                         op->replay = &replay_owner->so_replay;
 921                         nfsd4_encode_replay(resp, op);
 922                         status = op->status = op->replay->rp_status;
 923                 } else {
 924                         nfsd4_encode_operation(resp, op);
 925                         status = op->status;
 926                 }
 927                 if (replay_owner && (replay_owner != (void *)(-1))) {
 928                         nfs4_put_stateowner(replay_owner);
 929                         replay_owner = NULL;
 930                 }
 931                 /* XXX Ugh, we need to get rid of this kind of special case: */
 932                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 933                         fput(op->u.read.rd_filp);
 934         }
 935
 936 out:
 937         nfsd4_release_compoundargs(args);
 938         if (current_fh)
 939                 fh_put(current_fh);
 940         kfree(current_fh);
 941         if (save_fh)
 942                 fh_put(save_fh);
 943         kfree(save_fh);
 944         return status;
 945 }
 946
 947 #define nfs4svc_decode_voidargs         NULL
 948 #define nfs4svc_release_void            NULL
 949 #define nfsd4_voidres                   nfsd4_voidargs
 950 #define nfs4svc_release_compound        NULL
 951 struct nfsd4_voidargs { int dummy; };
 952
 953 #define PROC(name, argt, rest, relt, cache, respsize)   \
 954  { (svc_procfunc) nfsd4_proc_##name,            \
 955    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 956    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 957    (kxdrproc_t) nfs4svc_release_##relt,         \
 958    sizeof(struct nfsd4_##argt##args),           \
 959    sizeof(struct nfsd4_##rest##res),            \
 960    0,                                           \
 961    cache,                                       \
 962    respsize,                                    \
 963  }
 964
 965 /*
 966  * TODO: At the present time, the NFSv4 server does not do XID caching
 967  * of requests.  Implementing XID caching would not be a serious problem,
 968  * although it would require a mild change in interfaces since one
 969  * doesn't know whether an NFSv4 request is idempotent until after the
 970  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 971  * Astrand's regression testsuite for NFSv4 servers), which reuses
 972  * XID's liberally, so I've left it unimplemented until pynfs generates
 973  * better XID's.
 974  */
 975 static struct svc_procedure             nfsd_procedures4[2] = {
 976   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 977   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
 978 };
 979
 980 struct svc_version      nfsd_version4 = {
 981                 .vs_vers        = 4,
 982                 .vs_nproc       = 2,
 983                 .vs_proc        = nfsd_procedures4,
 984                 .vs_dispatch    = nfsd_dispatch,
 985                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
 986 };
 987
 988 /*
 989  * Local variables:
 990  *  c-basic-offset: 8
 991  * End:
 992  */