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)
 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         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 173                 return nfserr_grace;
 174
 175         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 176                 return nfserr_no_grace;
 177
 178         /* This check required by spec. */
 179         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 180                 return nfserr_inval;
 181
 182         nfs4_lock_state();
 183
 184         /* check seqid for replay. set nfs4_owner */
 185         status = nfsd4_process_open1(open);
 186         if (status == NFSERR_REPLAY_ME) {
 187                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 188                 fh_put(current_fh);
 189                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 190                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 191                                 rp->rp_openfh_len);
 192                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 193                 if (status)
 194                         dprintk("nfsd4_open: replay failed"
 195                                 " restoring previous filehandle\n");
 196                 else
 197                         status = NFSERR_REPLAY_ME;
 198         }
 199         if (status)
 200                 goto out;
 201         switch (open->op_claim_type) {
 202                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 203                         status = nfserr_inval;
 204                         if (open->op_create)
 205                                 goto out;
 206                         /* fall through */
 207                 case NFS4_OPEN_CLAIM_NULL:
 208                         /*
 209                          * (1) set CURRENT_FH to the file being opened,
 210                          * creating it if necessary, (2) set open->op_cinfo,
 211                          * (3) set open->op_truncate if the file is to be
 212                          * truncated after opening, (4) do permission checking.
 213                          */
 214                         status = do_open_lookup(rqstp, current_fh, open);
 215                         if (status)
 216                                 goto out;
 217                         break;
 218                 case NFS4_OPEN_CLAIM_PREVIOUS:
 219                         /*
 220                          * The CURRENT_FH is already set to the file being
 221                          * opened.  (1) set open->op_cinfo, (2) set
 222                          * open->op_truncate if the file is to be truncated
 223                          * after opening, (3) do permission checking.
 224                         */
 225                         status = do_open_fhandle(rqstp, current_fh, open);
 226                         if (status)
 227                                 goto out;
 228                         break;
 229                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 230                         printk("NFSD: unsupported OPEN claim type %d\n",
 231                                 open->op_claim_type);
 232                         status = nfserr_notsupp;
 233                         goto out;
 234                 default:
 235                         printk("NFSD: Invalid OPEN claim type %d\n",
 236                                 open->op_claim_type);
 237                         status = nfserr_inval;
 238                         goto out;
 239         }
 240         /*
 241          * nfsd4_process_open2() does the actual opening of the file.  If
 242          * successful, it (1) truncates the file if open->op_truncate was
 243          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 244          */
 245         status = nfsd4_process_open2(rqstp, current_fh, open);
 246 out:
 247         if (open->op_stateowner)
 248                 nfs4_get_stateowner(open->op_stateowner);
 249         nfs4_unlock_state();
 250         return status;
 251 }
 252
 253 /*
 254  * filehandle-manipulating ops.
 255  */
 256 static inline int
 257 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 258 {
 259         if (!current_fh->fh_dentry)
 260                 return nfserr_nofilehandle;
 261
 262         *getfh = current_fh;
 263         return nfs_ok;
 264 }
 265
 266 static inline int
 267 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 268 {
 269         fh_put(current_fh);
 270         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 271         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 272         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 273 }
 274
 275 static inline int
 276 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 277 {
 278         int status;
 279
 280         fh_put(current_fh);
 281         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 282                               &rqstp->rq_chandle);
 283         if (!status)
 284                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
 285         return status;
 286 }
 287
 288 static inline int
 289 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 290 {
 291         if (!save_fh->fh_dentry)
 292                 return nfserr_restorefh;
 293
 294         fh_dup2(current_fh, save_fh);
 295         return nfs_ok;
 296 }
 297
 298 static inline int
 299 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 300 {
 301         if (!current_fh->fh_dentry)
 302                 return nfserr_nofilehandle;
 303
 304         fh_dup2(save_fh, current_fh);
 305         return nfs_ok;
 306 }
 307
 308 /*
 309  * misc nfsv4 ops
 310  */
 311 static inline int
 312 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 313 {
 314         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 315                 return nfserr_inval;
 316
 317         access->ac_resp_access = access->ac_req_access;
 318         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 319 }
 320
 321 static inline int
 322 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 323 {
 324         int status;
 325
 326         u32 *p = (u32 *)commit->co_verf.data;
 327         *p++ = nfssvc_boot.tv_sec;
 328         *p++ = nfssvc_boot.tv_usec;
 329
 330         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 331         if (status == nfserr_symlink)
 332                 status = nfserr_inval;
 333         return status;
 334 }
 335
 336 static int
 337 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 338 {
 339         struct svc_fh resfh;
 340         int status;
 341         dev_t rdev;
 342
 343         fh_init(&resfh, NFS4_FHSIZE);
 344
 345         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 346         if (status == nfserr_symlink)
 347                 status = nfserr_notdir;
 348         if (status)
 349                 return status;
 350
 351         switch (create->cr_type) {
 352         case NF4LNK:
 353                 /* ugh! we have to null-terminate the linktext, or
 354                  * vfs_symlink() will choke.  it is always safe to
 355                  * null-terminate by brute force, since at worst we
 356                  * will overwrite the first byte of the create namelen
 357                  * in the XDR buffer, which has already been extracted
 358                  * during XDR decode.
 359                  */
 360                 create->cr_linkname[create->cr_linklen] = 0;
 361
 362                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 363                                       create->cr_namelen, create->cr_linkname,
 364                                       create->cr_linklen, &resfh, &create->cr_iattr);
 365                 break;
 366
 367         case NF4BLK:
 368                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 369                 if (MAJOR(rdev) != create->cr_specdata1 ||
 370                     MINOR(rdev) != create->cr_specdata2)
 371                         return nfserr_inval;
 372                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 373                                      create->cr_namelen, &create->cr_iattr,
 374                                      S_IFBLK, rdev, &resfh);
 375                 break;
 376
 377         case NF4CHR:
 378                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 379                 if (MAJOR(rdev) != create->cr_specdata1 ||
 380                     MINOR(rdev) != create->cr_specdata2)
 381                         return nfserr_inval;
 382                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 383                                      create->cr_namelen, &create->cr_iattr,
 384                                      S_IFCHR, rdev, &resfh);
 385                 break;
 386
 387         case NF4SOCK:
 388                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 389                                      create->cr_namelen, &create->cr_iattr,
 390                                      S_IFSOCK, 0, &resfh);
 391                 break;
 392
 393         case NF4FIFO:
 394                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 395                                      create->cr_namelen, &create->cr_iattr,
 396                                      S_IFIFO, 0, &resfh);
 397                 break;
 398
 399         case NF4DIR:
 400                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 401                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 402                                      create->cr_namelen, &create->cr_iattr,
 403                                      S_IFDIR, 0, &resfh);
 404                 break;
 405
 406         default:
 407                 status = nfserr_badtype;
 408         }
 409
 410         if (!status) {
 411                 fh_unlock(current_fh);
 412                 set_change_info(&create->cr_cinfo, current_fh);
 413                 fh_dup2(current_fh, &resfh);
 414         }
 415
 416         fh_put(&resfh);
 417         return status;
 418 }
 419
 420 static inline int
 421 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 422 {
 423         int status;
 424
 425         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 426         if (status)
 427                 return status;
 428
 429         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 430                 return nfserr_inval;
 431
 432         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 433         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 434
 435         getattr->ga_fhp = current_fh;
 436         return nfs_ok;
 437 }
 438
 439 static inline int
 440 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 441            struct svc_fh *save_fh, struct nfsd4_link *link)
 442 {
 443         int status = nfserr_nofilehandle;
 444
 445         if (!save_fh->fh_dentry)
 446                 return status;
 447         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 448         if (!status)
 449                 set_change_info(&link->li_cinfo, current_fh);
 450         return status;
 451 }
 452
 453 static int
 454 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 455 {
 456         struct svc_fh tmp_fh;
 457         int ret;
 458
 459         fh_init(&tmp_fh, NFS4_FHSIZE);
 460         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 461                               &rqstp->rq_chandle)) != 0)
 462                 return ret;
 463         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 464                 fh_put(&tmp_fh);
 465                 return nfserr_noent;
 466         }
 467         fh_put(&tmp_fh);
 468         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 469 }
 470
 471 static inline int
 472 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 473 {
 474         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 475 }
 476
 477 static inline int
 478 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 479 {
 480         int status;
 481
 482         /* no need to check permission - this will be done in nfsd_read() */
 483
 484         read->rd_filp = NULL;
 485         if (read->rd_offset >= OFFSET_MAX)
 486                 return nfserr_inval;
 487
 488         nfs4_lock_state();
 489         /* check stateid */
 490         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 491                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 492                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 493                 goto out;
 494         }
 495         if (read->rd_filp)
 496                 get_file(read->rd_filp);
 497         status = nfs_ok;
 498 out:
 499         nfs4_unlock_state();
 500         read->rd_rqstp = rqstp;
 501         read->rd_fhp = current_fh;
 502         return status;
 503 }
 504
 505 static inline int
 506 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 507 {
 508         u64 cookie = readdir->rd_cookie;
 509         static const nfs4_verifier zeroverf;
 510
 511         /* no need to check permission - this will be done in nfsd_readdir() */
 512
 513         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 514                 return nfserr_inval;
 515
 516         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 517         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 518
 519         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 520             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 521                 return nfserr_bad_cookie;
 522
 523         readdir->rd_rqstp = rqstp;
 524         readdir->rd_fhp = current_fh;
 525         return nfs_ok;
 526 }
 527
 528 static inline int
 529 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 530 {
 531         readlink->rl_rqstp = rqstp;
 532         readlink->rl_fhp = current_fh;
 533         return nfs_ok;
 534 }
 535
 536 static inline int
 537 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 538 {
 539         int status;
 540
 541         if (nfs4_in_grace())
 542                 return nfserr_grace;
 543         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 544         if (status == nfserr_symlink)
 545                 return nfserr_notdir;
 546         if (!status) {
 547                 fh_unlock(current_fh);
 548                 set_change_info(&remove->rm_cinfo, current_fh);
 549         }
 550         return status;
 551 }
 552
 553 static inline int
 554 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 555              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 556 {
 557         int status = nfserr_nofilehandle;
 558
 559         if (!save_fh->fh_dentry)
 560                 return status;
 561         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 562                                         & NFSEXP_NOSUBTREECHECK))
 563                 return nfserr_grace;
 564         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 565                              rename->rn_snamelen, current_fh,
 566                              rename->rn_tname, rename->rn_tnamelen);
 567
 568         /* the underlying filesystem returns different error's than required
 569          * by NFSv4. both save_fh and current_fh have been verified.. */
 570         if (status == nfserr_isdir)
 571                 status = nfserr_exist;
 572         else if ((status == nfserr_notdir) &&
 573                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 574                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 575                 status = nfserr_exist;
 576         else if (status == nfserr_symlink)
 577                 status = nfserr_notdir;
 578
 579         if (!status) {
 580                 set_change_info(&rename->rn_sinfo, current_fh);
 581                 set_change_info(&rename->rn_tinfo, save_fh);
 582         }
 583         return status;
 584 }
 585
 586 static inline int
 587 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 588 {
 589         int status = nfs_ok;
 590
 591         if (!current_fh->fh_dentry)
 592                 return nfserr_nofilehandle;
 593
 594         status = nfs_ok;
 595         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 596                 nfs4_lock_state();
 597                 if ((status = nfs4_preprocess_stateid_op(current_fh,
 598                                                 &setattr->sa_stateid,
 599                                                 CHECK_FH | WR_STATE, NULL))) {
 600                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 601                         goto out_unlock;
 602                 }
 603                 nfs4_unlock_state();
 604         }
 605         status = nfs_ok;
 606         if (setattr->sa_acl != NULL)
 607                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 608         if (status)
 609                 goto out;
 610         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 611                                 0, (time_t)0);
 612 out:
 613         return status;
 614 out_unlock:
 615         nfs4_unlock_state();
 616         return status;
 617 }
 618
 619 static inline int
 620 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 621 {
 622         stateid_t *stateid = &write->wr_stateid;
 623         struct file *filp = NULL;
 624         u32 *p;
 625         int status = nfs_ok;
 626
 627         /* no need to check permission - this will be done in nfsd_write() */
 628
 629         if (write->wr_offset >= OFFSET_MAX)
 630                 return nfserr_inval;
 631
 632         nfs4_lock_state();
 633         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
 634                                         CHECK_FH | WR_STATE, &filp))) {
 635                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 636                 goto out;
 637         }
 638         if (filp)
 639                 get_file(filp);
 640         nfs4_unlock_state();
 641
 642         write->wr_bytes_written = write->wr_buflen;
 643         write->wr_how_written = write->wr_stable_how;
 644         p = (u32 *)write->wr_verifier.data;
 645         *p++ = nfssvc_boot.tv_sec;
 646         *p++ = nfssvc_boot.tv_usec;
 647
 648         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
 649                         write->wr_vec, write->wr_vlen, write->wr_buflen,
 650                         &write->wr_how_written);
 651         if (filp)
 652                 fput(filp);
 653
 654         if (status == nfserr_symlink)
 655                 status = nfserr_inval;
 656         return status;
 657 out:
 658         nfs4_unlock_state();
 659         return status;
 660 }
 661
 662 /* This routine never returns NFS_OK!  If there are no other errors, it
 663  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 664  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 665  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 666  */
 667 static int
 668 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 669 {
 670         u32 *buf, *p;
 671         int count;
 672         int status;
 673
 674         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 675         if (status)
 676                 return status;
 677
 678         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 679             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 680                 return nfserr_attrnotsupp;
 681         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 682             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 683                 return nfserr_inval;
 684         if (verify->ve_attrlen & 3)
 685                 return nfserr_inval;
 686
 687         /* count in words:
 688          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 689          */
 690         count = 4 + (verify->ve_attrlen >> 2);
 691         buf = kmalloc(count << 2, GFP_KERNEL);
 692         if (!buf)
 693                 return nfserr_resource;
 694
 695         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 696                                     current_fh->fh_dentry, buf,
 697                                     &count, verify->ve_bmval,
 698                                     rqstp);
 699
 700         /* this means that nfsd4_encode_fattr() ran out of space */
 701         if (status == nfserr_resource && count == 0)
 702                 status = nfserr_not_same;
 703         if (status)
 704                 goto out_kfree;
 705
 706         p = buf + 3;
 707         status = nfserr_not_same;
 708         if (ntohl(*p++) != verify->ve_attrlen)
 709                 goto out_kfree;
 710         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 711                 status = nfserr_same;
 712
 713 out_kfree:
 714         kfree(buf);
 715         return status;
 716 }
 717
 718 /*
 719  * NULL call.
 720  */
 721 static int
 722 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 723 {
 724         return nfs_ok;
 725 }
 726
 727
 728 /*
 729  * COMPOUND call.
 730  */
 731 static int
 732 nfsd4_proc_compound(struct svc_rqst *rqstp,
 733                     struct nfsd4_compoundargs *args,
 734                     struct nfsd4_compoundres *resp)
 735 {
 736         struct nfsd4_op *op;
 737         struct svc_fh   *current_fh = NULL;
 738         struct svc_fh   *save_fh = NULL;
 739         struct nfs4_stateowner *replay_owner = NULL;
 740         int             slack_space;    /* in words, not bytes! */
 741         int             status;
 742
 743         status = nfserr_resource;
 744         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 745         if (current_fh == NULL)
 746                 goto out;
 747         fh_init(current_fh, NFS4_FHSIZE);
 748         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 749         if (save_fh == NULL)
 750                 goto out;
 751         fh_init(save_fh, NFS4_FHSIZE);
 752
 753         resp->xbuf = &rqstp->rq_res;
 754         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 755         resp->tagp = resp->p;
 756         /* reserve space for: taglen, tag, and opcnt */
 757         resp->p += 2 + XDR_QUADLEN(args->taglen);
 758         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 759         resp->taglen = args->taglen;
 760         resp->tag = args->tag;
 761         resp->opcnt = 0;
 762         resp->rqstp = rqstp;
 763
 764         /*
 765          * According to RFC3010, this takes precedence over all other errors.
 766          */
 767         status = nfserr_minor_vers_mismatch;
 768         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 769                 goto out;
 770
 771         status = nfs_ok;
 772         while (!status && resp->opcnt < args->opcnt) {
 773                 op = &args->ops[resp->opcnt++];
 774
 775                 /*
 776                  * The XDR decode routines may have pre-set op->status;
 777                  * for example, if there is a miscellaneous XDR error
 778                  * it will be set to nfserr_bad_xdr.
 779                  */
 780                 if (op->status)
 781                         goto encode_op;
 782
 783                 /* We must be able to encode a successful response to
 784                  * this operation, with enough room left over to encode a
 785                  * failed response to the next operation.  If we don't
 786                  * have enough room, fail with ERR_RESOURCE.
 787                  */
 788 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 789                 slack_space = (char *)resp->end - (char *)resp->p;
 790                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 791                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 792                         op->status = nfserr_resource;
 793                         goto encode_op;
 794                 }
 795
 796                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 797                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 798                 * require a valid current filehandle
 799                 *
 800                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 801                 * due to required returned bitmap argument
 802                 */
 803                 if ((!current_fh->fh_dentry) &&
 804                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 805                    (op->opnum == OP_SETCLIENTID) ||
 806                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 807                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 808                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 809                    (op->opnum == OP_SETATTR))) {
 810                         op->status = nfserr_nofilehandle;
 811                         goto encode_op;
 812                 }
 813                 switch (op->opnum) {
 814                 case OP_ACCESS:
 815                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 816                         break;
 817                 case OP_CLOSE:
 818                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close);
 819                         replay_owner = op->u.close.cl_stateowner;
 820                         break;
 821                 case OP_COMMIT:
 822                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 823                         break;
 824                 case OP_CREATE:
 825                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 826                         break;
 827                 case OP_DELEGRETURN:
 828                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 829                         break;
 830                 case OP_GETATTR:
 831                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 832                         break;
 833                 case OP_GETFH:
 834                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 835                         break;
 836                 case OP_LINK:
 837                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 838                         break;
 839                 case OP_LOCK:
 840                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock);
 841                         replay_owner = op->u.lock.lk_stateowner;
 842                         break;
 843                 case OP_LOCKT:
 844                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 845                         break;
 846                 case OP_LOCKU:
 847                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku);
 848                         replay_owner = op->u.locku.lu_stateowner;
 849                         break;
 850                 case OP_LOOKUP:
 851                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 852                         break;
 853                 case OP_LOOKUPP:
 854                         op->status = nfsd4_lookupp(rqstp, current_fh);
 855                         break;
 856                 case OP_NVERIFY:
 857                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 858                         if (op->status == nfserr_not_same)
 859                                 op->status = nfs_ok;
 860                         break;
 861                 case OP_OPEN:
 862                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open);
 863                         replay_owner = op->u.open.op_stateowner;
 864                         break;
 865                 case OP_OPEN_CONFIRM:
 866                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm);
 867                         replay_owner = op->u.open_confirm.oc_stateowner;
 868                         break;
 869                 case OP_OPEN_DOWNGRADE:
 870                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade);
 871                         replay_owner = op->u.open_downgrade.od_stateowner;
 872                         break;
 873                 case OP_PUTFH:
 874                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 875                         break;
 876                 case OP_PUTROOTFH:
 877                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 878                         break;
 879                 case OP_READ:
 880                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 881                         break;
 882                 case OP_READDIR:
 883                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 884                         break;
 885                 case OP_READLINK:
 886                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 887                         break;
 888                 case OP_REMOVE:
 889                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 890                         break;
 891                 case OP_RENAME:
 892                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 893                         break;
 894                 case OP_RENEW:
 895                         op->status = nfsd4_renew(&op->u.renew);
 896                         break;
 897                 case OP_RESTOREFH:
 898                         op->status = nfsd4_restorefh(current_fh, save_fh);
 899                         break;
 900                 case OP_SAVEFH:
 901                         op->status = nfsd4_savefh(current_fh, save_fh);
 902                         break;
 903                 case OP_SETATTR:
 904                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 905                         break;
 906                 case OP_SETCLIENTID:
 907                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 908                         break;
 909                 case OP_SETCLIENTID_CONFIRM:
 910                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 911                         break;
 912                 case OP_VERIFY:
 913                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 914                         if (op->status == nfserr_same)
 915                                 op->status = nfs_ok;
 916                         break;
 917                 case OP_WRITE:
 918                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 919                         break;
 920                 case OP_RELEASE_LOCKOWNER:
 921                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 922                         break;
 923                 default:
 924                         BUG_ON(op->status == nfs_ok);
 925                         break;
 926                 }
 927
 928 encode_op:
 929                 if (op->status == NFSERR_REPLAY_ME) {
 930                         op->replay = &replay_owner->so_replay;
 931                         nfsd4_encode_replay(resp, op);
 932                         status = op->status = op->replay->rp_status;
 933                 } else {
 934                         nfsd4_encode_operation(resp, op);
 935                         status = op->status;
 936                 }
 937                 if (replay_owner && (replay_owner != (void *)(-1))) {
 938                         nfs4_put_stateowner(replay_owner);
 939                         replay_owner = NULL;
 940                 }
 941                 /* XXX Ugh, we need to get rid of this kind of special case: */
 942                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 943                         fput(op->u.read.rd_filp);
 944         }
 945
 946 out:
 947         nfsd4_release_compoundargs(args);
 948         if (current_fh)
 949                 fh_put(current_fh);
 950         kfree(current_fh);
 951         if (save_fh)
 952                 fh_put(save_fh);
 953         kfree(save_fh);
 954         return status;
 955 }
 956
 957 #define nfs4svc_decode_voidargs         NULL
 958 #define nfs4svc_release_void            NULL
 959 #define nfsd4_voidres                   nfsd4_voidargs
 960 #define nfs4svc_release_compound        NULL
 961 struct nfsd4_voidargs { int dummy; };
 962
 963 #define PROC(name, argt, rest, relt, cache, respsize)   \
 964  { (svc_procfunc) nfsd4_proc_##name,            \
 965    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 966    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 967    (kxdrproc_t) nfs4svc_release_##relt,         \
 968    sizeof(struct nfsd4_##argt##args),           \
 969    sizeof(struct nfsd4_##rest##res),            \
 970    0,                                           \
 971    cache,                                       \
 972    respsize,                                    \
 973  }
 974
 975 /*
 976  * TODO: At the present time, the NFSv4 server does not do XID caching
 977  * of requests.  Implementing XID caching would not be a serious problem,
 978  * although it would require a mild change in interfaces since one
 979  * doesn't know whether an NFSv4 request is idempotent until after the
 980  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 981  * Astrand's regression testsuite for NFSv4 servers), which reuses
 982  * XID's liberally, so I've left it unimplemented until pynfs generates
 983  * better XID's.
 984  */
 985 static struct svc_procedure             nfsd_procedures4[2] = {
 986   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 987   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
 988 };
 989
 990 struct svc_version      nfsd_version4 = {
 991                 .vs_vers        = 4,
 992                 .vs_nproc       = 2,
 993                 .vs_proc        = nfsd_procedures4,
 994                 .vs_dispatch    = nfsd_dispatch,
 995                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
 996 };
 997
 998 /*
 999  * Local variables:
1000  *  c-basic-offset: 8
1001  * End:
1002  */