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         dprintk("NFSD: do_open_fhandle\n");
 139
 140         /* we don't know the target directory, and therefore can not
 141         * set the change info
 142         */
 143
 144         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 145
 146         /* set replay cache */
 147         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 148         memcpy(open->op_stateowner->so_replay.rp_openfh,
 149                 &current_fh->fh_handle.fh_base,
 150                 current_fh->fh_handle.fh_size);
 151
 152         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 153         !open->op_iattr.ia_size;
 154
 155         status = do_open_permission(rqstp, current_fh, open);
 156
 157         return status;
 158 }
 159
 160
 161 /*
 162  * nfs4_unlock_state() called in encode
 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_no_grace() &&
 176                            open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 177                 return nfserr_no_grace;
 178
 179         /* This check required by spec. */
 180         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 181                 return nfserr_inval;
 182
 183         open->op_stateowner = NULL;
 184         nfs4_lock_state();
 185
 186         /* check seqid for replay. set nfs4_owner */
 187         status = nfsd4_process_open1(open);
 188         if (status == NFSERR_REPLAY_ME) {
 189                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 190                 fh_put(current_fh);
 191                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 192                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 193                                 rp->rp_openfh_len);
 194                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 195                 if (status)
 196                         dprintk("nfsd4_open: replay failed"
 197                                 " restoring previous filehandle\n");
 198                 else
 199                         status = NFSERR_REPLAY_ME;
 200         }
 201         if (status)
 202                 return status;
 203         if (open->op_claim_type == NFS4_OPEN_CLAIM_NULL) {
 204         /*
 205          * This block of code will (1) set CURRENT_FH to the file being opened,
 206          * creating it if necessary, (2) set open->op_cinfo,
 207          * (3) set open->op_truncate if the file is to be truncated
 208          * after opening, (4) do permission checking.
 209          */
 210                 status = do_open_lookup(rqstp, current_fh, open);
 211                 if (status)
 212                         return status;
 213         } else if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
 214         /*
 215         * The CURRENT_FH is already set to the file being opened. This
 216         * block of code will (1) set open->op_cinfo, (2) set
 217         * open->op_truncate if the file is to be truncated after opening,
 218         * (3) do permission checking.
 219         */
 220                 status = do_open_fhandle(rqstp, current_fh, open);
 221                 if (status)
 222                         return status;
 223         } else {
 224                 printk("NFSD: unsupported OPEN claim type\n");
 225                 return nfserr_inval;
 226         }
 227         /*
 228          * nfsd4_process_open2() does the actual opening of the file.  If
 229          * successful, it (1) truncates the file if open->op_truncate was
 230          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 231          */
 232         status = nfsd4_process_open2(rqstp, current_fh, open);
 233         if (status)
 234                 return status;
 235         return 0;
 236 }
 237
 238 /*
 239  * filehandle-manipulating ops.
 240  */
 241 static inline int
 242 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 243 {
 244         if (!current_fh->fh_dentry)
 245                 return nfserr_nofilehandle;
 246
 247         *getfh = current_fh;
 248         return nfs_ok;
 249 }
 250
 251 static inline int
 252 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 253 {
 254         fh_put(current_fh);
 255         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 256         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 257         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 258 }
 259
 260 static inline int
 261 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 262 {
 263         int status;
 264
 265         fh_put(current_fh);
 266         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 267                               &rqstp->rq_chandle);
 268         if (!status)
 269                 status = nfsd_setuser(rqstp, current_fh->fh_export);
 270         return status;
 271 }
 272
 273 static inline int
 274 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 275 {
 276         if (!save_fh->fh_dentry)
 277                 return nfserr_restorefh;
 278
 279         fh_dup2(current_fh, save_fh);
 280         return nfs_ok;
 281 }
 282
 283 static inline int
 284 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 285 {
 286         if (!current_fh->fh_dentry)
 287                 return nfserr_nofilehandle;
 288
 289         fh_dup2(save_fh, current_fh);
 290         return nfs_ok;
 291 }
 292
 293 /*
 294  * misc nfsv4 ops
 295  */
 296 static inline int
 297 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 298 {
 299         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 300                 return nfserr_inval;
 301
 302         access->ac_resp_access = access->ac_req_access;
 303         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 304 }
 305
 306 static inline int
 307 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 308 {
 309         int status;
 310
 311         u32 *p = (u32 *)commit->co_verf.data;
 312         *p++ = nfssvc_boot.tv_sec;
 313         *p++ = nfssvc_boot.tv_usec;
 314
 315         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 316         if (status == nfserr_symlink)
 317                 status = nfserr_inval;
 318         return status;
 319 }
 320
 321 static inline int
 322 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 323 {
 324         struct svc_fh resfh;
 325         int status;
 326         dev_t rdev;
 327
 328         fh_init(&resfh, NFS4_FHSIZE);
 329
 330         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 331         if (status == nfserr_symlink)
 332                 status = nfserr_notdir;
 333         if (status)
 334                 return status;
 335
 336         switch (create->cr_type) {
 337         case NF4LNK:
 338                 /* ugh! we have to null-terminate the linktext, or
 339                  * vfs_symlink() will choke.  it is always safe to
 340                  * null-terminate by brute force, since at worst we
 341                  * will overwrite the first byte of the create namelen
 342                  * in the XDR buffer, which has already been extracted
 343                  * during XDR decode.
 344                  */
 345                 create->cr_linkname[create->cr_linklen] = 0;
 346
 347                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 348                                       create->cr_namelen, create->cr_linkname,
 349                                       create->cr_linklen, &resfh, &create->cr_iattr);
 350                 break;
 351
 352         case NF4BLK:
 353                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 354                 if (MAJOR(rdev) != create->cr_specdata1 ||
 355                     MINOR(rdev) != create->cr_specdata2)
 356                         return nfserr_inval;
 357                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 358                                      create->cr_namelen, &create->cr_iattr,
 359                                      S_IFBLK, rdev, &resfh);
 360                 break;
 361
 362         case NF4CHR:
 363                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 364                 if (MAJOR(rdev) != create->cr_specdata1 ||
 365                     MINOR(rdev) != create->cr_specdata2)
 366                         return nfserr_inval;
 367                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 368                                      create->cr_namelen, &create->cr_iattr,
 369                                      S_IFCHR, rdev, &resfh);
 370                 break;
 371
 372         case NF4SOCK:
 373                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 374                                      create->cr_namelen, &create->cr_iattr,
 375                                      S_IFSOCK, 0, &resfh);
 376                 break;
 377
 378         case NF4FIFO:
 379                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 380                                      create->cr_namelen, &create->cr_iattr,
 381                                      S_IFIFO, 0, &resfh);
 382                 break;
 383
 384         case NF4DIR:
 385                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 386                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 387                                      create->cr_namelen, &create->cr_iattr,
 388                                      S_IFDIR, 0, &resfh);
 389                 break;
 390
 391         default:
 392                 status = nfserr_badtype;
 393         }
 394
 395         if (!status) {
 396                 fh_unlock(current_fh);
 397                 set_change_info(&create->cr_cinfo, current_fh);
 398                 fh_dup2(current_fh, &resfh);
 399         }
 400
 401         fh_put(&resfh);
 402         return status;
 403 }
 404
 405 static inline int
 406 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 407 {
 408         int status;
 409
 410         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 411         if (status)
 412                 return status;
 413
 414         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 415                 return nfserr_inval;
 416
 417         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 418         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 419
 420         getattr->ga_fhp = current_fh;
 421         return nfs_ok;
 422 }
 423
 424 static inline int
 425 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 426            struct svc_fh *save_fh, struct nfsd4_link *link)
 427 {
 428         int status = nfserr_nofilehandle;
 429
 430         if (!save_fh->fh_dentry)
 431                 return status;
 432         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 433         if (!status)
 434                 set_change_info(&link->li_cinfo, current_fh);
 435         return status;
 436 }
 437
 438 static inline int
 439 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 440 {
 441         struct svc_fh tmp_fh;
 442         int ret;
 443
 444         fh_init(&tmp_fh, NFS4_FHSIZE);
 445         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 446                               &rqstp->rq_chandle)) != 0)
 447                 return ret;
 448         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 449                 fh_put(&tmp_fh);
 450                 return nfserr_noent;
 451         }
 452         fh_put(&tmp_fh);
 453         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 454 }
 455
 456 static inline int
 457 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 458 {
 459         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 460 }
 461
 462 static inline int
 463 access_bits_permit_read(unsigned long access_bmap)
 464 {
 465         return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
 466                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
 467 }
 468
 469 static inline int
 470 access_bits_permit_write(unsigned long access_bmap)
 471 {
 472         return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
 473                 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
 474 }
 475
 476 static inline int
 477 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 478 {
 479         struct nfs4_stateid *stp;
 480         int status;
 481
 482         /* no need to check permission - this will be done in nfsd_read() */
 483         if (nfs4_in_grace())
 484                 return nfserr_grace;
 485
 486         if (read->rd_offset >= OFFSET_MAX)
 487                 return nfserr_inval;
 488
 489         nfs4_lock_state();
 490         status = nfs_ok;
 491         /* For stateid -1, we don't check share reservations.  */
 492         if (ONE_STATEID(&read->rd_stateid)) {
 493                 dprintk("NFSD: nfsd4_read: -1 stateid...\n");
 494                 goto out;
 495         }
 496         /*
 497         * For stateid 0, the client doesn't have to have the file open, but
 498         * we still check for share reservation conflicts.
 499         */
 500         if (ZERO_STATEID(&read->rd_stateid)) {
 501                 dprintk("NFSD: nfsd4_read: zero stateid...\n");
 502                 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_READ))) {
 503                         dprintk("NFSD: nfsd4_read: conflicting share reservation!\n");
 504                         goto out;
 505                 }
 506                 status = nfs_ok;
 507                 goto out;
 508         }
 509         /* check stateid */
 510         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 511                                         CHECK_FH | RDWR_STATE, &stp))) {
 512                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 513                 goto out;
 514         }
 515         status = nfserr_openmode;
 516         if (!access_bits_permit_read(stp->st_access_bmap)) {
 517                 dprintk("NFSD: nfsd4_read: file not opened for read!\n");
 518                 goto out;
 519         }
 520         status = nfs_ok;
 521 out:
 522         nfs4_unlock_state();
 523         read->rd_rqstp = rqstp;
 524         read->rd_fhp = current_fh;
 525         return status;
 526 }
 527
 528 static inline int
 529 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 530 {
 531         u64 cookie = readdir->rd_cookie;
 532         static const nfs4_verifier zeroverf;
 533
 534         /* no need to check permission - this will be done in nfsd_readdir() */
 535
 536         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 537                 return nfserr_inval;
 538
 539         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 540         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 541
 542         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 543             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 544                 return nfserr_bad_cookie;
 545
 546         readdir->rd_rqstp = rqstp;
 547         readdir->rd_fhp = current_fh;
 548         return nfs_ok;
 549 }
 550
 551 static inline int
 552 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 553 {
 554         readlink->rl_rqstp = rqstp;
 555         readlink->rl_fhp = current_fh;
 556         return nfs_ok;
 557 }
 558
 559 static inline int
 560 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 561 {
 562         int status;
 563
 564         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 565         if (status == nfserr_symlink)
 566                 return nfserr_notdir;
 567         if (!status) {
 568                 fh_unlock(current_fh);
 569                 set_change_info(&remove->rm_cinfo, current_fh);
 570         }
 571         return status;
 572 }
 573
 574 static inline int
 575 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 576              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 577 {
 578         int status = nfserr_nofilehandle;
 579
 580         if (!save_fh->fh_dentry)
 581                 return status;
 582         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 583                              rename->rn_snamelen, current_fh,
 584                              rename->rn_tname, rename->rn_tnamelen);
 585
 586         /* the underlying filesystem returns different error's than required
 587          * by NFSv4. both save_fh and current_fh have been verified.. */
 588         if (status == nfserr_isdir)
 589                 status = nfserr_exist;
 590         else if ((status == nfserr_notdir) &&
 591                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 592                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 593                 status = nfserr_exist;
 594         else if (status == nfserr_symlink)
 595                 status = nfserr_notdir;
 596
 597         if (!status) {
 598                 set_change_info(&rename->rn_sinfo, current_fh);
 599                 set_change_info(&rename->rn_tinfo, save_fh);
 600         }
 601         return status;
 602 }
 603
 604 static inline int
 605 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 606 {
 607         struct nfs4_stateid *stp;
 608         int status = nfs_ok;
 609
 610         if (nfs4_in_grace())
 611                 return nfserr_grace;
 612
 613         if (!current_fh->fh_dentry)
 614                 return nfserr_nofilehandle;
 615
 616         status = nfs_ok;
 617         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 618
 619                 status = nfserr_bad_stateid;
 620                 if (ZERO_STATEID(&setattr->sa_stateid) || ONE_STATEID(&setattr->sa_stateid)) {
 621                         dprintk("NFSD: nfsd4_setattr: magic stateid!\n");
 622                         return status;
 623                 }
 624
 625                 nfs4_lock_state();
 626                 if ((status = nfs4_preprocess_stateid_op(current_fh,
 627                                                 &setattr->sa_stateid,
 628                                                 CHECK_FH | RDWR_STATE, &stp))) {
 629                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 630                         goto out;
 631                 }
 632                 status = nfserr_openmode;
 633                 if (!access_bits_permit_write(stp->st_access_bmap)) {
 634                         dprintk("NFSD: nfsd4_setattr: not opened for write!\n");
 635                         goto out;
 636                 }
 637                 nfs4_unlock_state();
 638         }
 639         return (nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr, 0, (time_t)0));
 640 out:
 641         nfs4_unlock_state();
 642         return status;
 643 }
 644
 645 static inline int
 646 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 647 {
 648         struct nfs4_stateid *stp;
 649         stateid_t *stateid = &write->wr_stateid;
 650         u32 *p;
 651         int status = nfs_ok;
 652
 653         if (nfs4_in_grace())
 654                 return nfserr_grace;
 655
 656         /* no need to check permission - this will be done in nfsd_write() */
 657
 658         if (write->wr_offset >= OFFSET_MAX)
 659                 return nfserr_inval;
 660
 661         nfs4_lock_state();
 662         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
 663                 dprintk("NFSD: nfsd4_write: zero stateid...\n");
 664                 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_WRITE))) {
 665                         dprintk("NFSD: nfsd4_write: conflicting share reservation!\n");
 666                         goto out;
 667                 }
 668                 goto zero_stateid;
 669         }
 670         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
 671                                         CHECK_FH | RDWR_STATE, &stp))) {
 672                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 673                 goto out;
 674         }
 675
 676         status = nfserr_openmode;
 677         if (!access_bits_permit_write(stp->st_access_bmap)) {
 678                 dprintk("NFSD: nfsd4_write: file not open for write!\n");
 679                 goto out;
 680         }
 681
 682 zero_stateid:
 683         nfs4_unlock_state();
 684         write->wr_bytes_written = write->wr_buflen;
 685         write->wr_how_written = write->wr_stable_how;
 686         p = (u32 *)write->wr_verifier.data;
 687         *p++ = nfssvc_boot.tv_sec;
 688         *p++ = nfssvc_boot.tv_usec;
 689
 690         status =  nfsd_write(rqstp, current_fh, write->wr_offset,
 691                           write->wr_vec, write->wr_vlen, write->wr_buflen,
 692                           &write->wr_how_written);
 693         if (status == nfserr_symlink)
 694                 status = nfserr_inval;
 695         return status;
 696 out:
 697         nfs4_unlock_state();
 698         return status;
 699 }
 700
 701 /* This routine never returns NFS_OK!  If there are no other errors, it
 702  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 703  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 704  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 705  */
 706 static int
 707 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 708 {
 709         u32 *buf, *p;
 710         int count;
 711         int status;
 712
 713         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 714         if (status)
 715                 return status;
 716
 717         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 718             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 719                 return nfserr_attrnotsupp;
 720         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 721             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 722                 return nfserr_inval;
 723         if (verify->ve_attrlen & 3)
 724                 return nfserr_inval;
 725
 726         /* count in words:
 727          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 728          */
 729         count = 4 + (verify->ve_attrlen >> 2);
 730         buf = kmalloc(count << 2, GFP_KERNEL);
 731         if (!buf)
 732                 return nfserr_resource;
 733
 734         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 735                                     current_fh->fh_dentry, buf,
 736                                     &count, verify->ve_bmval,
 737                                     rqstp);
 738
 739         /* this means that nfsd4_encode_fattr() ran out of space */
 740         if (status == nfserr_resource && count == 0)
 741                 status = nfserr_not_same;
 742         if (status)
 743                 goto out_kfree;
 744
 745         p = buf + 3;
 746         status = nfserr_not_same;
 747         if (ntohl(*p++) != verify->ve_attrlen)
 748                 goto out_kfree;
 749         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 750                 status = nfserr_same;
 751
 752 out_kfree:
 753         kfree(buf);
 754         return status;
 755 }
 756
 757 /*
 758  * NULL call.
 759  */
 760 static int
 761 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 762 {
 763         return nfs_ok;
 764 }
 765
 766
 767 /*
 768  * COMPOUND call.
 769  */
 770 static int
 771 nfsd4_proc_compound(struct svc_rqst *rqstp,
 772                     struct nfsd4_compoundargs *args,
 773                     struct nfsd4_compoundres *resp)
 774 {
 775         struct nfsd4_op *op;
 776         struct svc_fh   current_fh;
 777         struct svc_fh   save_fh;
 778         int             slack_space;    /* in words, not bytes! */
 779         int             status;
 780
 781         fh_init(&current_fh, NFS4_FHSIZE);
 782         fh_init(&save_fh, NFS4_FHSIZE);
 783
 784         resp->xbuf = &rqstp->rq_res;
 785         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 786         resp->tagp = resp->p;
 787         /* reserve space for: taglen, tag, and opcnt */
 788         resp->p += 2 + XDR_QUADLEN(args->taglen);
 789         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 790         resp->taglen = args->taglen;
 791         resp->tag = args->tag;
 792         resp->opcnt = 0;
 793         resp->rqstp = rqstp;
 794
 795         /*
 796          * According to RFC3010, this takes precedence over all other errors.
 797          */
 798         status = nfserr_minor_vers_mismatch;
 799         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 800                 goto out;
 801
 802         status = nfs_ok;
 803         while (!status && resp->opcnt < args->opcnt) {
 804                 op = &args->ops[resp->opcnt++];
 805
 806                 /*
 807                  * The XDR decode routines may have pre-set op->status;
 808                  * for example, if there is a miscellaneous XDR error
 809                  * it will be set to nfserr_bad_xdr.
 810                  */
 811                 if (op->status)
 812                         goto encode_op;
 813
 814                 /* We must be able to encode a successful response to
 815                  * this operation, with enough room left over to encode a
 816                  * failed response to the next operation.  If we don't
 817                  * have enough room, fail with ERR_RESOURCE.
 818                  */
 819 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 820                 slack_space = (char *)resp->end - (char *)resp->p;
 821                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 822                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 823                         op->status = nfserr_resource;
 824                         goto encode_op;
 825                 }
 826
 827                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 828                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 829                 * require a valid current filehandle
 830                 *
 831                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 832                 * due to required returned bitmap argument
 833                 */
 834                 if ((!current_fh.fh_dentry) &&
 835                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 836                    (op->opnum == OP_SETCLIENTID) ||
 837                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 838                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 839                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 840                    (op->opnum == OP_SETATTR))) {
 841                         op->status = nfserr_nofilehandle;
 842                         goto encode_op;
 843                 }
 844                 switch (op->opnum) {
 845                 case OP_ACCESS:
 846                         op->status = nfsd4_access(rqstp, &current_fh, &op->u.access);
 847                         break;
 848                 case OP_CLOSE:
 849                         op->status = nfsd4_close(rqstp, &current_fh, &op->u.close);
 850                         if (op->u.close.cl_stateowner)
 851                                 op->replay =
 852                                         &op->u.close.cl_stateowner->so_replay;
 853                         break;
 854                 case OP_COMMIT:
 855                         op->status = nfsd4_commit(rqstp, &current_fh, &op->u.commit);
 856                         break;
 857                 case OP_CREATE:
 858                         op->status = nfsd4_create(rqstp, &current_fh, &op->u.create);
 859                         break;
 860                 case OP_GETATTR:
 861                         op->status = nfsd4_getattr(rqstp, &current_fh, &op->u.getattr);
 862                         break;
 863                 case OP_GETFH:
 864                         op->status = nfsd4_getfh(&current_fh, &op->u.getfh);
 865                         break;
 866                 case OP_LINK:
 867                         op->status = nfsd4_link(rqstp, &current_fh, &save_fh, &op->u.link);
 868                         break;
 869                 case OP_LOCK:
 870                         op->status = nfsd4_lock(rqstp, &current_fh, &op->u.lock);
 871                         if (op->u.lock.lk_stateowner)
 872                                 op->replay =
 873                                         &op->u.lock.lk_stateowner->so_replay;
 874                         break;
 875                 case OP_LOCKT:
 876                         op->status = nfsd4_lockt(rqstp, &current_fh, &op->u.lockt);
 877                         break;
 878                 case OP_LOCKU:
 879                         op->status = nfsd4_locku(rqstp, &current_fh, &op->u.locku);
 880                         if (op->u.locku.lu_stateowner)
 881                                 op->replay =
 882                                         &op->u.locku.lu_stateowner->so_replay;
 883                         break;
 884                 case OP_LOOKUP:
 885                         op->status = nfsd4_lookup(rqstp, &current_fh, &op->u.lookup);
 886                         break;
 887                 case OP_LOOKUPP:
 888                         op->status = nfsd4_lookupp(rqstp, &current_fh);
 889                         break;
 890                 case OP_NVERIFY:
 891                         op->status = nfsd4_verify(rqstp, &current_fh, &op->u.nverify);
 892                         if (op->status == nfserr_not_same)
 893                                 op->status = nfs_ok;
 894                         break;
 895                 case OP_OPEN:
 896                         op->status = nfsd4_open(rqstp, &current_fh, &op->u.open);
 897                         if (op->u.open.op_stateowner)
 898                                 op->replay =
 899                                         &op->u.open.op_stateowner->so_replay;
 900                         break;
 901                 case OP_OPEN_CONFIRM:
 902                         op->status = nfsd4_open_confirm(rqstp, &current_fh, &op->u.open_confirm);
 903                         if (op->u.open_confirm.oc_stateowner)
 904                                 op->replay =
 905                                         &op->u.open_confirm.oc_stateowner->so_replay;
 906                         break;
 907                 case OP_OPEN_DOWNGRADE:
 908                         op->status = nfsd4_open_downgrade(rqstp, &current_fh, &op->u.open_downgrade);
 909                         if (op->u.open_downgrade.od_stateowner)
 910                                 op->replay =
 911                                         &op->u.open_downgrade.od_stateowner->so_replay;
 912                         break;
 913                 case OP_PUTFH:
 914                         op->status = nfsd4_putfh(rqstp, &current_fh, &op->u.putfh);
 915                         break;
 916                 case OP_PUTROOTFH:
 917                         op->status = nfsd4_putrootfh(rqstp, &current_fh);
 918                         break;
 919                 case OP_READ:
 920                         op->status = nfsd4_read(rqstp, &current_fh, &op->u.read);
 921                         break;
 922                 case OP_READDIR:
 923                         op->status = nfsd4_readdir(rqstp, &current_fh, &op->u.readdir);
 924                         break;
 925                 case OP_READLINK:
 926                         op->status = nfsd4_readlink(rqstp, &current_fh, &op->u.readlink);
 927                         break;
 928                 case OP_REMOVE:
 929                         op->status = nfsd4_remove(rqstp, &current_fh, &op->u.remove);
 930                         break;
 931                 case OP_RENAME:
 932                         op->status = nfsd4_rename(rqstp, &current_fh, &save_fh, &op->u.rename);
 933                         break;
 934                 case OP_RENEW:
 935                         op->status = nfsd4_renew(&op->u.renew);
 936                         break;
 937                 case OP_RESTOREFH:
 938                         op->status = nfsd4_restorefh(&current_fh, &save_fh);
 939                         break;
 940                 case OP_SAVEFH:
 941                         op->status = nfsd4_savefh(&current_fh, &save_fh);
 942                         break;
 943                 case OP_SETATTR:
 944                         op->status = nfsd4_setattr(rqstp, &current_fh, &op->u.setattr);
 945                         break;
 946                 case OP_SETCLIENTID:
 947                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 948                         break;
 949                 case OP_SETCLIENTID_CONFIRM:
 950                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 951                         break;
 952                 case OP_VERIFY:
 953                         op->status = nfsd4_verify(rqstp, &current_fh, &op->u.verify);
 954                         if (op->status == nfserr_same)
 955                                 op->status = nfs_ok;
 956                         break;
 957                 case OP_WRITE:
 958                         op->status = nfsd4_write(rqstp, &current_fh, &op->u.write);
 959                         break;
 960                 case OP_RELEASE_LOCKOWNER:
 961                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 962                         break;
 963                 default:
 964                         BUG_ON(op->status == nfs_ok);
 965                         break;
 966                 }
 967
 968 encode_op:
 969                 if (op->status == NFSERR_REPLAY_ME) {
 970                         nfsd4_encode_replay(resp, op);
 971                         status = op->status = op->replay->rp_status;
 972                 } else {
 973                         nfsd4_encode_operation(resp, op);
 974                         status = op->status;
 975                 }
 976         }
 977
 978 out:
 979         if (args->ops != args->iops) {
 980                 kfree(args->ops);
 981                 args->ops = args->iops;
 982         }
 983         if (args->tmpp) {
 984                 kfree(args->tmpp);
 985                 args->tmpp = NULL;
 986         }
 987         while (args->to_free) {
 988                 struct tmpbuf *tb = args->to_free;
 989                 args->to_free = tb->next;
 990                 kfree(tb->buf);
 991                 kfree(tb);
 992         }
 993         fh_put(&current_fh);
 994         fh_put(&save_fh);
 995         return status;
 996 }
 997
 998 #define nfs4svc_decode_voidargs         NULL
 999 #define nfs4svc_release_void            NULL
1000 #define nfsd4_voidres                   nfsd4_voidargs
1001 #define nfs4svc_release_compound        NULL
1002 struct nfsd4_voidargs { int dummy; };
1003
1004 #define PROC(name, argt, rest, relt, cache, respsize)   \
1005  { (svc_procfunc) nfsd4_proc_##name,            \
1006    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1007    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1008    (kxdrproc_t) nfs4svc_release_##relt,         \
1009    sizeof(struct nfsd4_##argt##args),           \
1010    sizeof(struct nfsd4_##rest##res),            \
1011    0,                                           \
1012    cache,                                       \
1013    respsize,                                    \
1014  }
1015
1016 /*
1017  * TODO: At the present time, the NFSv4 server does not do XID caching
1018  * of requests.  Implementing XID caching would not be a serious problem,
1019  * although it would require a mild change in interfaces since one
1020  * doesn't know whether an NFSv4 request is idempotent until after the
1021  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1022  * Astrand's regression testsuite for NFSv4 servers), which reuses
1023  * XID's liberally, so I've left it unimplemented until pynfs generates
1024  * better XID's.
1025  */
1026 static struct svc_procedure             nfsd_procedures4[2] = {
1027   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1028   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
1029 };
1030
1031 struct svc_version      nfsd_version4 = {
1032                 .vs_vers        = 4,
1033                 .vs_nproc       = 2,
1034                 .vs_proc        = nfsd_procedures4,
1035                 .vs_dispatch    = nfsd_dispatch,
1036                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1037 };
1038
1039 /*
1040  * Local variables:
1041  *  c-basic-offset: 8
1042  * End:
1043  */