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 #include <linux/nfs4_acl.h>
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  58
  59 static inline void
  60 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  61 {
  62         fh_put(dst);
  63         dget(src->fh_dentry);
  64         if (src->fh_export)
  65                 cache_get(&src->fh_export->h);
  66         *dst = *src;
  67 }
  68
  69 static int
  70 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  71 {
  72         int accmode, status;
  73
  74         if (open->op_truncate &&
  75                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  76                 return nfserr_inval;
  77
  78         accmode = MAY_NOP;
  79         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  80                 accmode = MAY_READ;
  81         if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
  82                 accmode |= (MAY_WRITE | MAY_TRUNC);
  83         accmode |= MAY_OWNER_OVERRIDE;
  84
  85         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  86
  87         return status;
  88 }
  89
  90 static int
  91 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  92 {
  93         struct svc_fh resfh;
  94         int status;
  95
  96         fh_init(&resfh, NFS4_FHSIZE);
  97         open->op_truncate = 0;
  98
  99         if (open->op_create) {
 100                 /*
 101                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 102                  * in NFSv4 as in v3.
 103                  */
 104                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 105                                         open->op_fname.len, &open->op_iattr,
 106                                         &resfh, open->op_createmode,
 107                                         (u32 *)open->op_verf.data, &open->op_truncate);
 108         }
 109         else {
 110                 status = nfsd_lookup(rqstp, current_fh,
 111                                      open->op_fname.data, open->op_fname.len, &resfh);
 112                 fh_unlock(current_fh);
 113         }
 114
 115         if (!status) {
 116                 set_change_info(&open->op_cinfo, current_fh);
 117
 118                 /* set reply cache */
 119                 fh_dup2(current_fh, &resfh);
 120                 /* XXXJBF: keep a saved svc_fh struct instead?? */
 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;
 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         if (open->op_claim_type == NFS4_OPEN_CLAIM_NULL) {
 202         /*
 203          * This block of code will (1) set CURRENT_FH to the file being opened,
 204          * creating it if necessary, (2) set open->op_cinfo,
 205          * (3) set open->op_truncate if the file is to be truncated
 206          * after opening, (4) do permission checking.
 207          */
 208                 status = do_open_lookup(rqstp, current_fh, open);
 209                 if (status)
 210                         goto out;
 211         } else if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
 212         /*
 213         * The CURRENT_FH is already set to the file being opened. This
 214         * block of code will (1) set open->op_cinfo, (2) set
 215         * open->op_truncate if the file is to be truncated after opening,
 216         * (3) do permission checking.
 217         */
 218                 status = do_open_fhandle(rqstp, current_fh, open);
 219                 if (status)
 220                         goto out;
 221         } else {
 222                 printk("NFSD: unsupported OPEN claim type\n");
 223                 status = nfserr_inval;
 224                 goto out;
 225         }
 226         /*
 227          * nfsd4_process_open2() does the actual opening of the file.  If
 228          * successful, it (1) truncates the file if open->op_truncate was
 229          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 230          */
 231         status = nfsd4_process_open2(rqstp, current_fh, open);
 232 out:
 233         if (open->op_stateowner)
 234                 nfs4_get_stateowner(open->op_stateowner);
 235         nfs4_unlock_state();
 236         return status;
 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 = nfserrno(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                         goto out;
 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_unlock;
 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_unlock;
 637                 }
 638                 nfs4_unlock_state();
 639         }
 640         status = nfs_ok;
 641         if (setattr->sa_acl != NULL)
 642                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 643         if (status)
 644                 goto out;
 645         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 646                                 0, (time_t)0);
 647 out:
 648         return status;
 649 out_unlock:
 650         nfs4_unlock_state();
 651         return status;
 652 }
 653
 654 static inline int
 655 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 656 {
 657         struct nfs4_stateid *stp;
 658         stateid_t *stateid = &write->wr_stateid;
 659         u32 *p;
 660         int status = nfs_ok;
 661
 662         if (nfs4_in_grace())
 663                 return nfserr_grace;
 664
 665         /* no need to check permission - this will be done in nfsd_write() */
 666
 667         if (write->wr_offset >= OFFSET_MAX)
 668                 return nfserr_inval;
 669
 670         nfs4_lock_state();
 671         if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
 672                 dprintk("NFSD: nfsd4_write: zero stateid...\n");
 673                 if ((status = nfs4_share_conflict(current_fh, NFS4_SHARE_DENY_WRITE))) {
 674                         dprintk("NFSD: nfsd4_write: conflicting share reservation!\n");
 675                         goto out;
 676                 }
 677                 goto zero_stateid;
 678         }
 679         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
 680                                         CHECK_FH | RDWR_STATE, &stp))) {
 681                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 682                 goto out;
 683         }
 684
 685         status = nfserr_openmode;
 686         if (!access_bits_permit_write(stp->st_access_bmap)) {
 687                 dprintk("NFSD: nfsd4_write: file not open for write!\n");
 688                 goto out;
 689         }
 690
 691 zero_stateid:
 692         nfs4_unlock_state();
 693         write->wr_bytes_written = write->wr_buflen;
 694         write->wr_how_written = write->wr_stable_how;
 695         p = (u32 *)write->wr_verifier.data;
 696         *p++ = nfssvc_boot.tv_sec;
 697         *p++ = nfssvc_boot.tv_usec;
 698
 699         status =  nfsd_write(rqstp, current_fh, write->wr_offset,
 700                           write->wr_vec, write->wr_vlen, write->wr_buflen,
 701                           &write->wr_how_written);
 702         if (status == nfserr_symlink)
 703                 status = nfserr_inval;
 704         return status;
 705 out:
 706         nfs4_unlock_state();
 707         return status;
 708 }
 709
 710 /* This routine never returns NFS_OK!  If there are no other errors, it
 711  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 712  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 713  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 714  */
 715 static int
 716 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 717 {
 718         u32 *buf, *p;
 719         int count;
 720         int status;
 721
 722         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 723         if (status)
 724                 return status;
 725
 726         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 727             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 728                 return nfserr_attrnotsupp;
 729         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 730             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 731                 return nfserr_inval;
 732         if (verify->ve_attrlen & 3)
 733                 return nfserr_inval;
 734
 735         /* count in words:
 736          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 737          */
 738         count = 4 + (verify->ve_attrlen >> 2);
 739         buf = kmalloc(count << 2, GFP_KERNEL);
 740         if (!buf)
 741                 return nfserr_resource;
 742
 743         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 744                                     current_fh->fh_dentry, buf,
 745                                     &count, verify->ve_bmval,
 746                                     rqstp);
 747
 748         /* this means that nfsd4_encode_fattr() ran out of space */
 749         if (status == nfserr_resource && count == 0)
 750                 status = nfserr_not_same;
 751         if (status)
 752                 goto out_kfree;
 753
 754         p = buf + 3;
 755         status = nfserr_not_same;
 756         if (ntohl(*p++) != verify->ve_attrlen)
 757                 goto out_kfree;
 758         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 759                 status = nfserr_same;
 760
 761 out_kfree:
 762         kfree(buf);
 763         return status;
 764 }
 765
 766 /*
 767  * NULL call.
 768  */
 769 static int
 770 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 771 {
 772         return nfs_ok;
 773 }
 774
 775
 776 /*
 777  * COMPOUND call.
 778  */
 779 static int
 780 nfsd4_proc_compound(struct svc_rqst *rqstp,
 781                     struct nfsd4_compoundargs *args,
 782                     struct nfsd4_compoundres *resp)
 783 {
 784         struct nfsd4_op *op;
 785         struct svc_fh   *current_fh = NULL;
 786         struct svc_fh   *save_fh = NULL;
 787         struct nfs4_stateowner *replay_owner = NULL;
 788         int             slack_space;    /* in words, not bytes! */
 789         int             status;
 790
 791         status = nfserr_resource;
 792         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 793         if (current_fh == NULL)
 794                 goto out;
 795         fh_init(current_fh, NFS4_FHSIZE);
 796         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 797         if (save_fh == NULL)
 798                 goto out;
 799         fh_init(save_fh, NFS4_FHSIZE);
 800
 801         resp->xbuf = &rqstp->rq_res;
 802         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 803         resp->tagp = resp->p;
 804         /* reserve space for: taglen, tag, and opcnt */
 805         resp->p += 2 + XDR_QUADLEN(args->taglen);
 806         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 807         resp->taglen = args->taglen;
 808         resp->tag = args->tag;
 809         resp->opcnt = 0;
 810         resp->rqstp = rqstp;
 811
 812         /*
 813          * According to RFC3010, this takes precedence over all other errors.
 814          */
 815         status = nfserr_minor_vers_mismatch;
 816         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 817                 goto out;
 818
 819         status = nfs_ok;
 820         while (!status && resp->opcnt < args->opcnt) {
 821                 op = &args->ops[resp->opcnt++];
 822
 823                 /*
 824                  * The XDR decode routines may have pre-set op->status;
 825                  * for example, if there is a miscellaneous XDR error
 826                  * it will be set to nfserr_bad_xdr.
 827                  */
 828                 if (op->status)
 829                         goto encode_op;
 830
 831                 /* We must be able to encode a successful response to
 832                  * this operation, with enough room left over to encode a
 833                  * failed response to the next operation.  If we don't
 834                  * have enough room, fail with ERR_RESOURCE.
 835                  */
 836 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 837                 slack_space = (char *)resp->end - (char *)resp->p;
 838                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 839                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 840                         op->status = nfserr_resource;
 841                         goto encode_op;
 842                 }
 843
 844                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 845                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 846                 * require a valid current filehandle
 847                 *
 848                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 849                 * due to required returned bitmap argument
 850                 */
 851                 if ((!current_fh->fh_dentry) &&
 852                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 853                    (op->opnum == OP_SETCLIENTID) ||
 854                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 855                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 856                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 857                    (op->opnum == OP_SETATTR))) {
 858                         op->status = nfserr_nofilehandle;
 859                         goto encode_op;
 860                 }
 861                 switch (op->opnum) {
 862                 case OP_ACCESS:
 863                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 864                         break;
 865                 case OP_CLOSE:
 866                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close);
 867                         replay_owner = op->u.close.cl_stateowner;
 868                         break;
 869                 case OP_COMMIT:
 870                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 871                         break;
 872                 case OP_CREATE:
 873                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 874                         break;
 875                 case OP_GETATTR:
 876                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 877                         break;
 878                 case OP_GETFH:
 879                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 880                         break;
 881                 case OP_LINK:
 882                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 883                         break;
 884                 case OP_LOCK:
 885                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock);
 886                         replay_owner = op->u.lock.lk_stateowner;
 887                         break;
 888                 case OP_LOCKT:
 889                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 890                         break;
 891                 case OP_LOCKU:
 892                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku);
 893                         replay_owner = op->u.locku.lu_stateowner;
 894                         break;
 895                 case OP_LOOKUP:
 896                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 897                         break;
 898                 case OP_LOOKUPP:
 899                         op->status = nfsd4_lookupp(rqstp, current_fh);
 900                         break;
 901                 case OP_NVERIFY:
 902                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 903                         if (op->status == nfserr_not_same)
 904                                 op->status = nfs_ok;
 905                         break;
 906                 case OP_OPEN:
 907                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open);
 908                         replay_owner = op->u.open.op_stateowner;
 909                         break;
 910                 case OP_OPEN_CONFIRM:
 911                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm);
 912                         replay_owner = op->u.open_confirm.oc_stateowner;
 913                         break;
 914                 case OP_OPEN_DOWNGRADE:
 915                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade);
 916                         replay_owner = op->u.open_downgrade.od_stateowner;
 917                         break;
 918                 case OP_PUTFH:
 919                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 920                         break;
 921                 case OP_PUTROOTFH:
 922                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 923                         break;
 924                 case OP_READ:
 925                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 926                         break;
 927                 case OP_READDIR:
 928                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 929                         break;
 930                 case OP_READLINK:
 931                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 932                         break;
 933                 case OP_REMOVE:
 934                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 935                         break;
 936                 case OP_RENAME:
 937                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 938                         break;
 939                 case OP_RENEW:
 940                         op->status = nfsd4_renew(&op->u.renew);
 941                         break;
 942                 case OP_RESTOREFH:
 943                         op->status = nfsd4_restorefh(current_fh, save_fh);
 944                         break;
 945                 case OP_SAVEFH:
 946                         op->status = nfsd4_savefh(current_fh, save_fh);
 947                         break;
 948                 case OP_SETATTR:
 949                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 950                         break;
 951                 case OP_SETCLIENTID:
 952                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 953                         break;
 954                 case OP_SETCLIENTID_CONFIRM:
 955                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 956                         break;
 957                 case OP_VERIFY:
 958                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 959                         if (op->status == nfserr_same)
 960                                 op->status = nfs_ok;
 961                         break;
 962                 case OP_WRITE:
 963                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 964                         break;
 965                 case OP_RELEASE_LOCKOWNER:
 966                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 967                         break;
 968                 default:
 969                         BUG_ON(op->status == nfs_ok);
 970                         break;
 971                 }
 972
 973 encode_op:
 974                 if (op->status == NFSERR_REPLAY_ME) {
 975                         op->replay = &replay_owner->so_replay;
 976                         nfsd4_encode_replay(resp, op);
 977                         status = op->status = op->replay->rp_status;
 978                 } else {
 979                         nfsd4_encode_operation(resp, op);
 980                         status = op->status;
 981                 }
 982                 if (replay_owner && (replay_owner != (void *)(-1))) {
 983                         nfs4_put_stateowner(replay_owner);
 984                         replay_owner = NULL;
 985                 }
 986         }
 987
 988 out:
 989         nfsd4_release_compoundargs(args);
 990         if (current_fh)
 991                 fh_put(current_fh);
 992         kfree(current_fh);
 993         if (save_fh)
 994                 fh_put(save_fh);
 995         kfree(save_fh);
 996         return status;
 997 }
 998
 999 #define nfs4svc_decode_voidargs         NULL
1000 #define nfs4svc_release_void            NULL
1001 #define nfsd4_voidres                   nfsd4_voidargs
1002 #define nfs4svc_release_compound        NULL
1003 struct nfsd4_voidargs { int dummy; };
1004
1005 #define PROC(name, argt, rest, relt, cache, respsize)   \
1006  { (svc_procfunc) nfsd4_proc_##name,            \
1007    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1008    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1009    (kxdrproc_t) nfs4svc_release_##relt,         \
1010    sizeof(struct nfsd4_##argt##args),           \
1011    sizeof(struct nfsd4_##rest##res),            \
1012    0,                                           \
1013    cache,                                       \
1014    respsize,                                    \
1015  }
1016
1017 /*
1018  * TODO: At the present time, the NFSv4 server does not do XID caching
1019  * of requests.  Implementing XID caching would not be a serious problem,
1020  * although it would require a mild change in interfaces since one
1021  * doesn't know whether an NFSv4 request is idempotent until after the
1022  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1023  * Astrand's regression testsuite for NFSv4 servers), which reuses
1024  * XID's liberally, so I've left it unimplemented until pynfs generates
1025  * better XID's.
1026  */
1027 static struct svc_procedure             nfsd_procedures4[2] = {
1028   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1029   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
1030 };
1031
1032 struct svc_version      nfsd_version4 = {
1033                 .vs_vers        = 4,
1034                 .vs_nproc       = 2,
1035                 .vs_proc        = nfsd_procedures4,
1036                 .vs_dispatch    = nfsd_dispatch,
1037                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1038 };
1039
1040 /*
1041  * Local variables:
1042  *  c-basic-offset: 8
1043  * End:
1044  */