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
  49 #include <linux/sunrpc/svc.h>
  50 #include <linux/nfsd/nfsd.h>
  51 #include <linux/nfsd/cache.h>
  52 #include <linux/nfs4.h>
  53 #include <linux/nfsd/state.h>
  54 #include <linux/nfsd/xdr4.h>
  55
  56 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  57
  58 static inline void
  59 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  60 {
  61         fh_put(dst);
  62         dget(src->fh_dentry);
  63         if (src->fh_export)
  64                 cache_get(&src->fh_export->h);
  65         *dst = *src;
  66 }
  67
  68 static int
  69 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  70 {
  71         int accmode, status;
  72
  73         if (open->op_truncate &&
  74                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  75                 return nfserr_inval;
  76
  77         accmode = MAY_NOP;
  78         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  79                 accmode = MAY_READ;
  80         if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
  81                 accmode |= (MAY_WRITE | MAY_TRUNC);
  82         accmode |= MAY_OWNER_OVERRIDE;
  83
  84         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  85
  86         return status;
  87 }
  88
  89 static int
  90 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  91 {
  92         struct svc_fh resfh;
  93         int status;
  94
  95         fh_init(&resfh, NFS4_FHSIZE);
  96         open->op_truncate = 0;
  97
  98         if (open->op_create) {
  99                 /*
 100                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 101                  * in NFSv4 as in v3.
 102                  */
 103                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 104                                         open->op_fname.len, &open->op_iattr,
 105                                         &resfh, open->op_createmode,
 106                                         (u32 *)open->op_verf.data, &open->op_truncate);
 107         }
 108         else {
 109                 status = nfsd_lookup(rqstp, current_fh,
 110                                      open->op_fname.data, open->op_fname.len, &resfh);
 111                 fh_unlock(current_fh);
 112         }
 113
 114         if (!status) {
 115                 set_change_info(&open->op_cinfo, current_fh);
 116
 117                 /* set reply cache */
 118                 fh_dup2(current_fh, &resfh);
 119                 /* XXXJBF: keep a saved svc_fh struct instead?? */
 120                 open->op_stateowner->so_replay.rp_openfh_len =
 121                         resfh.fh_handle.fh_size;
 122                 memcpy(open->op_stateowner->so_replay.rp_openfh,
 123                                 &resfh.fh_handle.fh_base,
 124                                 resfh.fh_handle.fh_size);
 125
 126                 status = do_open_permission(rqstp, current_fh, open);
 127         }
 128
 129         fh_put(&resfh);
 130         return status;
 131 }
 132
 133 static int
 134 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 135 {
 136         int status;
 137
 138         /* Only reclaims from previously confirmed clients are valid */
 139         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 140                 return status;
 141
 142         /* We don't know the target directory, and therefore can not
 143         * set the change info
 144         */
 145
 146         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 147
 148         /* set replay cache */
 149         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 150         memcpy(open->op_stateowner->so_replay.rp_openfh,
 151                 &current_fh->fh_handle.fh_base,
 152                 current_fh->fh_handle.fh_size);
 153
 154         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 155         !open->op_iattr.ia_size;
 156
 157         status = do_open_permission(rqstp, current_fh, open);
 158
 159         return status;
 160 }
 161
 162
 163 /*
 164  * nfs4_unlock_state() called in encode
 165  */
 166 static inline int
 167 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 168 {
 169         int status;
 170         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 171                 (int)open->op_fname.len, open->op_fname.data,
 172                 open->op_stateowner);
 173
 174         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 175                 return nfserr_grace;
 176
 177         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 178                 return nfserr_no_grace;
 179
 180         /* This check required by spec. */
 181         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 182                 return nfserr_inval;
 183
 184         open->op_stateowner = NULL;
 185         nfs4_lock_state();
 186
 187         /* check seqid for replay. set nfs4_owner */
 188         status = nfsd4_process_open1(open);
 189         if (status == NFSERR_REPLAY_ME) {
 190                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 191                 fh_put(current_fh);
 192                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 193                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 194                                 rp->rp_openfh_len);
 195                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 196                 if (status)
 197                         dprintk("nfsd4_open: replay failed"
 198                                 " restoring previous filehandle\n");
 199                 else
 200                         status = NFSERR_REPLAY_ME;
 201         }
 202         if (status)
 203                 return status;
 204         if (open->op_claim_type == NFS4_OPEN_CLAIM_NULL) {
 205         /*
 206          * This block of code will (1) set CURRENT_FH to the file being opened,
 207          * creating it if necessary, (2) set open->op_cinfo,
 208          * (3) set open->op_truncate if the file is to be truncated
 209          * after opening, (4) do permission checking.
 210          */
 211                 status = do_open_lookup(rqstp, current_fh, open);
 212                 if (status)
 213                         return status;
 214         } else if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
 215         /*
 216         * The CURRENT_FH is already set to the file being opened. This
 217         * block of code will (1) set open->op_cinfo, (2) set
 218         * open->op_truncate if the file is to be truncated after opening,
 219         * (3) do permission checking.
 220         */
 221                 status = do_open_fhandle(rqstp, current_fh, open);
 222                 if (status)
 223                         return status;
 224         } else {
 225                 printk("NFSD: unsupported OPEN claim type\n");
 226                 return nfserr_inval;
 227         }
 228         /*
 229          * nfsd4_process_open2() does the actual opening of the file.  If
 230          * successful, it (1) truncates the file if open->op_truncate was
 231          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 232          */
 233         status = nfsd4_process_open2(rqstp, current_fh, open);
 234         if (status)
 235                 return status;
 236         return 0;
 237 }
 238
 239 /*
 240  * filehandle-manipulating ops.
 241  */
 242 static inline int
 243 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 244 {
 245         if (!current_fh->fh_dentry)
 246                 return nfserr_nofilehandle;
 247
 248         *getfh = current_fh;
 249         return nfs_ok;
 250 }
 251
 252 static inline int
 253 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 254 {
 255         fh_put(current_fh);
 256         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 257         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 258         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 259 }
 260
 261 static inline int
 262 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 263 {
 264         int status;
 265
 266         fh_put(current_fh);
 267         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 268                               &rqstp->rq_chandle);
 269         if (!status)
 270                 status = nfsd_setuser(rqstp, current_fh->fh_export);
 271         return status;
 272 }
 273
 274 static inline int
 275 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 276 {
 277         if (!save_fh->fh_dentry)
 278                 return nfserr_restorefh;
 279
 280         fh_dup2(current_fh, save_fh);
 281         return nfs_ok;
 282 }
 283
 284 static inline int
 285 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 286 {
 287         if (!current_fh->fh_dentry)
 288                 return nfserr_nofilehandle;
 289
 290         fh_dup2(save_fh, current_fh);
 291         return nfs_ok;
 292 }
 293
 294 /*
 295  * misc nfsv4 ops
 296  */
 297 static inline int
 298 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 299 {
 300         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 301                 return nfserr_inval;
 302
 303         access->ac_resp_access = access->ac_req_access;
 304         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 305 }
 306
 307 static inline int
 308 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 309 {
 310         int status;
 311
 312         u32 *p = (u32 *)commit->co_verf.data;
 313         *p++ = nfssvc_boot.tv_sec;
 314         *p++ = nfssvc_boot.tv_usec;
 315
 316         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 317         if (status == nfserr_symlink)
 318                 status = nfserr_inval;
 319         return status;
 320 }
 321
 322 static int
 323 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 324 {
 325         struct svc_fh resfh;
 326         int status;
 327         dev_t rdev;
 328
 329         fh_init(&resfh, NFS4_FHSIZE);
 330
 331         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 332         if (status == nfserr_symlink)
 333                 status = nfserr_notdir;
 334         if (status)
 335                 return status;
 336
 337         switch (create->cr_type) {
 338         case NF4LNK:
 339                 /* ugh! we have to null-terminate the linktext, or
 340                  * vfs_symlink() will choke.  it is always safe to
 341                  * null-terminate by brute force, since at worst we
 342                  * will overwrite the first byte of the create namelen
 343                  * in the XDR buffer, which has already been extracted
 344                  * during XDR decode.
 345                  */
 346                 create->cr_linkname[create->cr_linklen] = 0;
 347
 348                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 349                                       create->cr_namelen, create->cr_linkname,
 350                                       create->cr_linklen, &resfh, &create->cr_iattr);
 351                 break;
 352
 353         case NF4BLK:
 354                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 355                 if (MAJOR(rdev) != create->cr_specdata1 ||
 356                     MINOR(rdev) != create->cr_specdata2)
 357                         return nfserr_inval;
 358                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 359                                      create->cr_namelen, &create->cr_iattr,
 360                                      S_IFBLK, rdev, &resfh);
 361                 break;
 362
 363         case NF4CHR:
 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_IFCHR, rdev, &resfh);
 371                 break;
 372
 373         case NF4SOCK:
 374                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 375                                      create->cr_namelen, &create->cr_iattr,
 376                                      S_IFSOCK, 0, &resfh);
 377                 break;
 378
 379         case NF4FIFO:
 380                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 381                                      create->cr_namelen, &create->cr_iattr,
 382                                      S_IFIFO, 0, &resfh);
 383                 break;
 384
 385         case NF4DIR:
 386                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 387                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 388                                      create->cr_namelen, &create->cr_iattr,
 389                                      S_IFDIR, 0, &resfh);
 390                 break;
 391
 392         default:
 393                 status = nfserr_badtype;
 394         }
 395
 396         if (!status) {
 397                 fh_unlock(current_fh);
 398                 set_change_info(&create->cr_cinfo, current_fh);
 399                 fh_dup2(current_fh, &resfh);
 400         }
 401
 402         fh_put(&resfh);
 403         return status;
 404 }
 405
 406 static inline int
 407 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 408 {
 409         int status;
 410
 411         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 412         if (status)
 413                 return status;
 414
 415         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 416                 return nfserr_inval;
 417
 418         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 419         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 420
 421         getattr->ga_fhp = current_fh;
 422         return nfs_ok;
 423 }
 424
 425 static inline int
 426 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 427            struct svc_fh *save_fh, struct nfsd4_link *link)
 428 {
 429         int status = nfserr_nofilehandle;
 430
 431         if (!save_fh->fh_dentry)
 432                 return status;
 433         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 434         if (!status)
 435                 set_change_info(&link->li_cinfo, current_fh);
 436         return status;
 437 }
 438
 439 static int
 440 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 441 {
 442         struct svc_fh tmp_fh;
 443         int ret;
 444
 445         fh_init(&tmp_fh, NFS4_FHSIZE);
 446         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 447                               &rqstp->rq_chandle)) != 0)
 448                 return ret;
 449         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 450                 fh_put(&tmp_fh);
 451                 return nfserr_noent;
 452         }
 453         fh_put(&tmp_fh);
 454         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 455 }
 456
 457 static inline int
 458 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 459 {
 460         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 461 }
 462
 463 static inline int
 464 access_bits_permit_read(unsigned long access_bmap)
 465 {
 466         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
 467                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
 468 }
 469
 470 static inline int
 471 access_bits_permit_write(unsigned long access_bmap)
 472 {
 473         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
 474                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
 475 }
 476
 477 static inline int
 478 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 479 {
 480         struct nfs4_stateid *stp;
 481         int status;
 482
 483         /* no need to check permission - this will be done in nfsd_read() */
 484         if (nfs4_in_grace())
 485                 return nfserr_grace;
 486
 487         if (read->rd_offset >= OFFSET_MAX)
 488                 return nfserr_inval;
 489
 490         nfs4_lock_state();
 491         status = nfs_ok;
 492         /* For stateid -1, we don't check share reservations.  */
 493         if (ONE_STATEID(&read->rd_stateid)) {
 494                 dprintk("NFSD: nfsd4_read: -1 stateid...\n");
 495                 goto out;
 496         }
 497         /*
 498         * For stateid 0, the client doesn't have to have the file open, but
 499         * we still check for share reservation conflicts.
 500         */
 501         if (ZERO_STATEID(&read->rd_stateid)) {
 502                 dprintk("NFSD: nfsd4_read: zero stateid...\n");
 503                 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_READ))) {
 504                         dprintk("NFSD: nfsd4_read: conflicting share reservation!\n");
 505                         goto out;
 506                 }
 507                 status = nfs_ok;
 508                 goto out;
 509         }
 510         /* check stateid */
 511         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 512                                         CHECK_FH | RDWR_STATE, &stp))) {
 513                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 514                 goto out;
 515         }
 516         status = nfserr_openmode;
 517         if (!access_bits_permit_read(stp->st_access_bmap)) {
 518                 dprintk("NFSD: nfsd4_read: file not opened for read!\n");
 519                 goto out;
 520         }
 521         status = nfs_ok;
 522 out:
 523         nfs4_unlock_state();
 524         read->rd_rqstp = rqstp;
 525         read->rd_fhp = current_fh;
 526         return status;
 527 }
 528
 529 static inline int
 530 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 531 {
 532         u64 cookie = readdir->rd_cookie;
 533         static const nfs4_verifier zeroverf;
 534
 535         /* no need to check permission - this will be done in nfsd_readdir() */
 536
 537         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 538                 return nfserr_inval;
 539
 540         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 541         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 542
 543         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 544             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 545                 return nfserr_bad_cookie;
 546
 547         readdir->rd_rqstp = rqstp;
 548         readdir->rd_fhp = current_fh;
 549         return nfs_ok;
 550 }
 551
 552 static inline int
 553 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 554 {
 555         readlink->rl_rqstp = rqstp;
 556         readlink->rl_fhp = current_fh;
 557         return nfs_ok;
 558 }
 559
 560 static inline int
 561 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 562 {
 563         int status;
 564
 565         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 566         if (status == nfserr_symlink)
 567                 return nfserr_notdir;
 568         if (!status) {
 569                 fh_unlock(current_fh);
 570                 set_change_info(&remove->rm_cinfo, current_fh);
 571         }
 572         return status;
 573 }
 574
 575 static inline int
 576 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 577              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 578 {
 579         int status = nfserr_nofilehandle;
 580
 581         if (!save_fh->fh_dentry)
 582                 return status;
 583         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 584                              rename->rn_snamelen, current_fh,
 585                              rename->rn_tname, rename->rn_tnamelen);
 586
 587         /* the underlying filesystem returns different error's than required
 588          * by NFSv4. both save_fh and current_fh have been verified.. */
 589         if (status == nfserr_isdir)
 590                 status = nfserr_exist;
 591         else if ((status == nfserr_notdir) &&
 592                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 593                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 594                 status = nfserr_exist;
 595         else if (status == nfserr_symlink)
 596                 status = nfserr_notdir;
 597
 598         if (!status) {
 599                 set_change_info(&rename->rn_sinfo, current_fh);
 600                 set_change_info(&rename->rn_tinfo, save_fh);
 601         }
 602         return status;
 603 }
 604
 605 static inline int
 606 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 607 {
 608         struct nfs4_stateid *stp;
 609         int status = nfs_ok;
 610
 611         if (nfs4_in_grace())
 612                 return nfserr_grace;
 613
 614         if (!current_fh->fh_dentry)
 615                 return nfserr_nofilehandle;
 616
 617         status = nfs_ok;
 618         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 619
 620                 status = nfserr_bad_stateid;
 621                 if (ZERO_STATEID(&setattr->sa_stateid) || ONE_STATEID(&setattr->sa_stateid)) {
 622                         dprintk("NFSD: nfsd4_setattr: magic stateid!\n");
 623                         return status;
 624                 }
 625
 626                 nfs4_lock_state();
 627                 if ((status = nfs4_preprocess_stateid_op(current_fh,
 628                                                 &setattr->sa_stateid,
 629                                                 CHECK_FH | RDWR_STATE, &stp))) {
 630                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 631                         goto out;
 632                 }
 633                 status = nfserr_openmode;
 634                 if (!access_bits_permit_write(stp->st_access_bmap)) {
 635                         dprintk("NFSD: nfsd4_setattr: not opened for write!\n");
 636                         goto out;
 637                 }
 638                 nfs4_unlock_state();
 639         }
 640         return (nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr, 0, (time_t)0));
 641 out:
 642         nfs4_unlock_state();
 643         return status;
 644 }
 645
 646 static inline int
 647 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 648 {
 649         struct nfs4_stateid *stp;
 650         stateid_t *stateid = &write->wr_stateid;
 651         u32 *p;
 652         int status = nfs_ok;
 653
 654         if (nfs4_in_grace())
 655                 return nfserr_grace;
 656
 657         /* no need to check permission - this will be done in nfsd_write() */
 658
 659         if (write->wr_offset >= OFFSET_MAX)
 660                 return nfserr_inval;
 661
 662         nfs4_lock_state();
 663         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
 664                 dprintk("NFSD: nfsd4_write: zero stateid...\n");
 665                 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_WRITE))) {
 666                         dprintk("NFSD: nfsd4_write: conflicting share reservation!\n");
 667                         goto out;
 668                 }
 669                 goto zero_stateid;
 670         }
 671         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
 672                                         CHECK_FH | RDWR_STATE, &stp))) {
 673                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 674                 goto out;
 675         }
 676
 677         status = nfserr_openmode;
 678         if (!access_bits_permit_write(stp->st_access_bmap)) {
 679                 dprintk("NFSD: nfsd4_write: file not open for write!\n");
 680                 goto out;
 681         }
 682
 683 zero_stateid:
 684         nfs4_unlock_state();
 685         write->wr_bytes_written = write->wr_buflen;
 686         write->wr_how_written = write->wr_stable_how;
 687         p = (u32 *)write->wr_verifier.data;
 688         *p++ = nfssvc_boot.tv_sec;
 689         *p++ = nfssvc_boot.tv_usec;
 690
 691         status =  nfsd_write(rqstp, current_fh, write->wr_offset,
 692                           write->wr_vec, write->wr_vlen, write->wr_buflen,
 693                           &write->wr_how_written);
 694         if (status == nfserr_symlink)
 695                 status = nfserr_inval;
 696         return status;
 697 out:
 698         nfs4_unlock_state();
 699         return status;
 700 }
 701
 702 /* This routine never returns NFS_OK!  If there are no other errors, it
 703  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 704  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 705  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 706  */
 707 static int
 708 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 709 {
 710         u32 *buf, *p;
 711         int count;
 712         int status;
 713
 714         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 715         if (status)
 716                 return status;
 717
 718         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 719             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 720                 return nfserr_attrnotsupp;
 721         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 722             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 723                 return nfserr_inval;
 724         if (verify->ve_attrlen & 3)
 725                 return nfserr_inval;
 726
 727         /* count in words:
 728          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 729          */
 730         count = 4 + (verify->ve_attrlen >> 2);
 731         buf = kmalloc(count << 2, GFP_KERNEL);
 732         if (!buf)
 733                 return nfserr_resource;
 734
 735         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 736                                     current_fh->fh_dentry, buf,
 737                                     &count, verify->ve_bmval,
 738                                     rqstp);
 739
 740         /* this means that nfsd4_encode_fattr() ran out of space */
 741         if (status == nfserr_resource && count == 0)
 742                 status = nfserr_not_same;
 743         if (status)
 744                 goto out_kfree;
 745
 746         p = buf + 3;
 747         status = nfserr_not_same;
 748         if (ntohl(*p++) != verify->ve_attrlen)
 749                 goto out_kfree;
 750         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 751                 status = nfserr_same;
 752
 753 out_kfree:
 754         kfree(buf);
 755         return status;
 756 }
 757
 758 /*
 759  * NULL call.
 760  */
 761 static int
 762 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 763 {
 764         return nfs_ok;
 765 }
 766
 767
 768 /*
 769  * COMPOUND call.
 770  */
 771 static int
 772 nfsd4_proc_compound(struct svc_rqst *rqstp,
 773                     struct nfsd4_compoundargs *args,
 774                     struct nfsd4_compoundres *resp)
 775 {
 776         struct nfsd4_op *op;
 777         struct svc_fh   *current_fh = NULL;
 778         struct svc_fh   *save_fh = NULL;
 779         int             slack_space;    /* in words, not bytes! */
 780         int             status;
 781
 782         status = nfserr_resource;
 783         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 784         if (current_fh == NULL)
 785                 goto out;
 786         fh_init(current_fh, NFS4_FHSIZE);
 787         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 788         if (save_fh == NULL)
 789                 goto out;
 790         fh_init(save_fh, NFS4_FHSIZE);
 791
 792         resp->xbuf = &rqstp->rq_res;
 793         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 794         resp->tagp = resp->p;
 795         /* reserve space for: taglen, tag, and opcnt */
 796         resp->p += 2 + XDR_QUADLEN(args->taglen);
 797         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 798         resp->taglen = args->taglen;
 799         resp->tag = args->tag;
 800         resp->opcnt = 0;
 801         resp->rqstp = rqstp;
 802
 803         /*
 804          * According to RFC3010, this takes precedence over all other errors.
 805          */
 806         status = nfserr_minor_vers_mismatch;
 807         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 808                 goto out;
 809
 810         status = nfs_ok;
 811         while (!status && resp->opcnt < args->opcnt) {
 812                 op = &args->ops[resp->opcnt++];
 813
 814                 /*
 815                  * The XDR decode routines may have pre-set op->status;
 816                  * for example, if there is a miscellaneous XDR error
 817                  * it will be set to nfserr_bad_xdr.
 818                  */
 819                 if (op->status)
 820                         goto encode_op;
 821
 822                 /* We must be able to encode a successful response to
 823                  * this operation, with enough room left over to encode a
 824                  * failed response to the next operation.  If we don't
 825                  * have enough room, fail with ERR_RESOURCE.
 826                  */
 827 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 828                 slack_space = (char *)resp->end - (char *)resp->p;
 829                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 830                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 831                         op->status = nfserr_resource;
 832                         goto encode_op;
 833                 }
 834
 835                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 836                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 837                 * require a valid current filehandle
 838                 *
 839                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 840                 * due to required returned bitmap argument
 841                 */
 842                 if ((!current_fh->fh_dentry) &&
 843                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 844                    (op->opnum == OP_SETCLIENTID) ||
 845                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 846                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 847                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 848                    (op->opnum == OP_SETATTR))) {
 849                         op->status = nfserr_nofilehandle;
 850                         goto encode_op;
 851                 }
 852                 switch (op->opnum) {
 853                 case OP_ACCESS:
 854                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 855                         break;
 856                 case OP_CLOSE:
 857                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close);
 858                         if (op->u.close.cl_stateowner)
 859                                 op->replay =
 860                                         &op->u.close.cl_stateowner->so_replay;
 861                         break;
 862                 case OP_COMMIT:
 863                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 864                         break;
 865                 case OP_CREATE:
 866                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 867                         break;
 868                 case OP_GETATTR:
 869                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 870                         break;
 871                 case OP_GETFH:
 872                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 873                         break;
 874                 case OP_LINK:
 875                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 876                         break;
 877                 case OP_LOCK:
 878                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock);
 879                         if (op->u.lock.lk_stateowner)
 880                                 op->replay =
 881                                         &op->u.lock.lk_stateowner->so_replay;
 882                         break;
 883                 case OP_LOCKT:
 884                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 885                         break;
 886                 case OP_LOCKU:
 887                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku);
 888                         if (op->u.locku.lu_stateowner)
 889                                 op->replay =
 890                                         &op->u.locku.lu_stateowner->so_replay;
 891                         break;
 892                 case OP_LOOKUP:
 893                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 894                         break;
 895                 case OP_LOOKUPP:
 896                         op->status = nfsd4_lookupp(rqstp, current_fh);
 897                         break;
 898                 case OP_NVERIFY:
 899                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 900                         if (op->status == nfserr_not_same)
 901                                 op->status = nfs_ok;
 902                         break;
 903                 case OP_OPEN:
 904                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open);
 905                         if (op->u.open.op_stateowner)
 906                                 op->replay =
 907                                         &op->u.open.op_stateowner->so_replay;
 908                         break;
 909                 case OP_OPEN_CONFIRM:
 910                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm);
 911                         if (op->u.open_confirm.oc_stateowner)
 912                                 op->replay =
 913                                         &op->u.open_confirm.oc_stateowner->so_replay;
 914                         break;
 915                 case OP_OPEN_DOWNGRADE:
 916                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade);
 917                         if (op->u.open_downgrade.od_stateowner)
 918                                 op->replay =
 919                                         &op->u.open_downgrade.od_stateowner->so_replay;
 920                         break;
 921                 case OP_PUTFH:
 922                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 923                         break;
 924                 case OP_PUTROOTFH:
 925                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 926                         break;
 927                 case OP_READ:
 928                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 929                         break;
 930                 case OP_READDIR:
 931                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 932                         break;
 933                 case OP_READLINK:
 934                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 935                         break;
 936                 case OP_REMOVE:
 937                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 938                         break;
 939                 case OP_RENAME:
 940                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 941                         break;
 942                 case OP_RENEW:
 943                         op->status = nfsd4_renew(&op->u.renew);
 944                         break;
 945                 case OP_RESTOREFH:
 946                         op->status = nfsd4_restorefh(current_fh, save_fh);
 947                         break;
 948                 case OP_SAVEFH:
 949                         op->status = nfsd4_savefh(current_fh, save_fh);
 950                         break;
 951                 case OP_SETATTR:
 952                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 953                         break;
 954                 case OP_SETCLIENTID:
 955                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 956                         break;
 957                 case OP_SETCLIENTID_CONFIRM:
 958                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 959                         break;
 960                 case OP_VERIFY:
 961                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 962                         if (op->status == nfserr_same)
 963                                 op->status = nfs_ok;
 964                         break;
 965                 case OP_WRITE:
 966                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 967                         break;
 968                 case OP_RELEASE_LOCKOWNER:
 969                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 970                         break;
 971                 default:
 972                         BUG_ON(op->status == nfs_ok);
 973                         break;
 974                 }
 975
 976 encode_op:
 977                 if (op->status == NFSERR_REPLAY_ME) {
 978                         nfsd4_encode_replay(resp, op);
 979                         status = op->status = op->replay->rp_status;
 980                 } else {
 981                         nfsd4_encode_operation(resp, op);
 982                         status = op->status;
 983                 }
 984         }
 985
 986 out:
 987         nfsd4_release_compoundargs(args);
 988         if (current_fh)
 989                 fh_put(current_fh);
 990         kfree(current_fh);
 991         if (save_fh)
 992                 fh_put(save_fh);
 993         kfree(save_fh);
 994         return status;
 995 }
 996
 997 #define nfs4svc_decode_voidargs         NULL
 998 #define nfs4svc_release_void            NULL
 999 #define nfsd4_voidres                   nfsd4_voidargs
1000 #define nfs4svc_release_compound        NULL
1001 struct nfsd4_voidargs { int dummy; };
1002
1003 #define PROC(name, argt, rest, relt, cache, respsize)   \
1004  { (svc_procfunc) nfsd4_proc_##name,            \
1005    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1006    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1007    (kxdrproc_t) nfs4svc_release_##relt,         \
1008    sizeof(struct nfsd4_##argt##args),           \
1009    sizeof(struct nfsd4_##rest##res),            \
1010    0,                                           \
1011    cache,                                       \
1012    respsize,                                    \
1013  }
1014
1015 /*
1016  * TODO: At the present time, the NFSv4 server does not do XID caching
1017  * of requests.  Implementing XID caching would not be a serious problem,
1018  * although it would require a mild change in interfaces since one
1019  * doesn't know whether an NFSv4 request is idempotent until after the
1020  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1021  * Astrand's regression testsuite for NFSv4 servers), which reuses
1022  * XID's liberally, so I've left it unimplemented until pynfs generates
1023  * better XID's.
1024  */
1025 static struct svc_procedure             nfsd_procedures4[2] = {
1026   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1027   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
1028 };
1029
1030 struct svc_version      nfsd_version4 = {
1031                 .vs_vers        = 4,
1032                 .vs_nproc       = 2,
1033                 .vs_proc        = nfsd_procedures4,
1034                 .vs_dispatch    = nfsd_dispatch,
1035                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1036 };
1037
1038 /*
1039  * Local variables:
1040  *  c-basic-offset: 8
1041  * End:
1042  */