fs/nfsd/nfs4proc.c

   1 /*
   2  *  fs/nfsd/nfs4proc.c
   3  *
   4  *  Server-side procedures for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Note: some routines in this file are just trivial wrappers
  38  * (e.g. nfsd4_lookup()) defined solely for the sake of consistent
  39  * naming.  Since all such routines have been declared "inline",
  40  * there shouldn't be any associated overhead.  At some point in
  41  * the future, I might inline these "by hand" to clean up a
  42  * little.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/major.h>
  47 #include <linux/slab.h>
  48 #include <linux/file.h>
  49
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/nfsd/nfsd.h>
  52 #include <linux/nfsd/cache.h>
  53 #include <linux/nfs4.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfs4_acl.h>
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  59
  60 static inline void
  61 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  62 {
  63         fh_put(dst);
  64         dget(src->fh_dentry);
  65         if (src->fh_export)
  66                 cache_get(&src->fh_export->h);
  67         *dst = *src;
  68 }
  69
  70 static int
  71 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  72 {
  73         int accmode, status;
  74
  75         if (open->op_truncate &&
  76                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  77                 return nfserr_inval;
  78
  79         accmode = MAY_NOP;
  80         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  81                 accmode = MAY_READ;
  82         if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
  83                 accmode |= (MAY_WRITE | MAY_TRUNC);
  84         accmode |= MAY_OWNER_OVERRIDE;
  85
  86         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  87
  88         return status;
  89 }
  90
  91 static int
  92 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  93 {
  94         struct svc_fh resfh;
  95         int status;
  96
  97         fh_init(&resfh, NFS4_FHSIZE);
  98         open->op_truncate = 0;
  99
 100         if (open->op_create) {
 101                 /*
 102                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 103                  * in NFSv4 as in v3.
 104                  */
 105                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 106                                         open->op_fname.len, &open->op_iattr,
 107                                         &resfh, open->op_createmode,
 108                                         (u32 *)open->op_verf.data, &open->op_truncate);
 109         }
 110         else {
 111                 status = nfsd_lookup(rqstp, current_fh,
 112                                      open->op_fname.data, open->op_fname.len, &resfh);
 113                 fh_unlock(current_fh);
 114         }
 115
 116         if (!status) {
 117                 set_change_info(&open->op_cinfo, current_fh);
 118
 119                 /* set reply cache */
 120                 fh_dup2(current_fh, &resfh);
 121                 open->op_stateowner->so_replay.rp_openfh_len =
 122                         resfh.fh_handle.fh_size;
 123                 memcpy(open->op_stateowner->so_replay.rp_openfh,
 124                                 &resfh.fh_handle.fh_base,
 125                                 resfh.fh_handle.fh_size);
 126
 127                 status = do_open_permission(rqstp, current_fh, open);
 128         }
 129
 130         fh_put(&resfh);
 131         return status;
 132 }
 133
 134 static int
 135 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 136 {
 137         int status;
 138
 139         /* Only reclaims from previously confirmed clients are valid */
 140         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 141                 return status;
 142
 143         /* We don't know the target directory, and therefore can not
 144         * set the change info
 145         */
 146
 147         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 148
 149         /* set replay cache */
 150         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 151         memcpy(open->op_stateowner->so_replay.rp_openfh,
 152                 &current_fh->fh_handle.fh_base,
 153                 current_fh->fh_handle.fh_size);
 154
 155         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 156                 (open->op_iattr.ia_size == 0);
 157
 158         status = do_open_permission(rqstp, current_fh, open);
 159
 160         return status;
 161 }
 162
 163
 164 static inline int
 165 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 166 {
 167         int status;
 168         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 169                 (int)open->op_fname.len, open->op_fname.data,
 170                 open->op_stateowner);
 171
 172         /* This check required by spec. */
 173         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 174                 return nfserr_inval;
 175
 176         nfs4_lock_state();
 177
 178         /* check seqid for replay. set nfs4_owner */
 179         status = nfsd4_process_open1(open);
 180         if (status == NFSERR_REPLAY_ME) {
 181                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 182                 fh_put(current_fh);
 183                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 184                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 185                                 rp->rp_openfh_len);
 186                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 187                 if (status)
 188                         dprintk("nfsd4_open: replay failed"
 189                                 " restoring previous filehandle\n");
 190                 else
 191                         status = NFSERR_REPLAY_ME;
 192         }
 193         if (status)
 194                 goto out;
 195         switch (open->op_claim_type) {
 196                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 197                         status = nfserr_inval;
 198                         if (open->op_create)
 199                                 goto out;
 200                         /* fall through */
 201                 case NFS4_OPEN_CLAIM_NULL:
 202                         /*
 203                          * (1) set CURRENT_FH to the file being opened,
 204                          * creating it if necessary, (2) set open->op_cinfo,
 205                          * (3) set open->op_truncate if the file is to be
 206                          * truncated after opening, (4) do permission checking.
 207                          */
 208                         status = do_open_lookup(rqstp, current_fh, open);
 209                         if (status)
 210                                 goto out;
 211                         break;
 212                 case NFS4_OPEN_CLAIM_PREVIOUS:
 213                         /*
 214                          * The CURRENT_FH is already set to the file being
 215                          * opened.  (1) set open->op_cinfo, (2) set
 216                          * open->op_truncate if the file is to be truncated
 217                          * after opening, (3) do permission checking.
 218                         */
 219                         status = do_open_fhandle(rqstp, current_fh, open);
 220                         if (status)
 221                                 goto out;
 222                         break;
 223                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 224                         printk("NFSD: unsupported OPEN claim type %d\n",
 225                                 open->op_claim_type);
 226                         status = nfserr_notsupp;
 227                         goto out;
 228                 default:
 229                         printk("NFSD: Invalid OPEN claim type %d\n",
 230                                 open->op_claim_type);
 231                         status = nfserr_inval;
 232                         goto out;
 233         }
 234         /*
 235          * nfsd4_process_open2() does the actual opening of the file.  If
 236          * successful, it (1) truncates the file if open->op_truncate was
 237          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 238          */
 239         status = nfsd4_process_open2(rqstp, current_fh, open);
 240 out:
 241         if (open->op_stateowner)
 242                 nfs4_get_stateowner(open->op_stateowner);
 243         nfs4_unlock_state();
 244         return status;
 245 }
 246
 247 /*
 248  * filehandle-manipulating ops.
 249  */
 250 static inline int
 251 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 252 {
 253         if (!current_fh->fh_dentry)
 254                 return nfserr_nofilehandle;
 255
 256         *getfh = current_fh;
 257         return nfs_ok;
 258 }
 259
 260 static inline int
 261 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 262 {
 263         fh_put(current_fh);
 264         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 265         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 266         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 267 }
 268
 269 static inline int
 270 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 271 {
 272         int status;
 273
 274         fh_put(current_fh);
 275         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 276                               &rqstp->rq_chandle);
 277         if (!status)
 278                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
 279         return status;
 280 }
 281
 282 static inline int
 283 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 284 {
 285         if (!save_fh->fh_dentry)
 286                 return nfserr_restorefh;
 287
 288         fh_dup2(current_fh, save_fh);
 289         return nfs_ok;
 290 }
 291
 292 static inline int
 293 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 294 {
 295         if (!current_fh->fh_dentry)
 296                 return nfserr_nofilehandle;
 297
 298         fh_dup2(save_fh, current_fh);
 299         return nfs_ok;
 300 }
 301
 302 /*
 303  * misc nfsv4 ops
 304  */
 305 static inline int
 306 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 307 {
 308         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 309                 return nfserr_inval;
 310
 311         access->ac_resp_access = access->ac_req_access;
 312         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 313 }
 314
 315 static inline int
 316 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 317 {
 318         int status;
 319
 320         u32 *p = (u32 *)commit->co_verf.data;
 321         *p++ = nfssvc_boot.tv_sec;
 322         *p++ = nfssvc_boot.tv_usec;
 323
 324         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 325         if (status == nfserr_symlink)
 326                 status = nfserr_inval;
 327         return status;
 328 }
 329
 330 static int
 331 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 332 {
 333         struct svc_fh resfh;
 334         int status;
 335         dev_t rdev;
 336
 337         fh_init(&resfh, NFS4_FHSIZE);
 338
 339         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 340         if (status == nfserr_symlink)
 341                 status = nfserr_notdir;
 342         if (status)
 343                 return status;
 344
 345         switch (create->cr_type) {
 346         case NF4LNK:
 347                 /* ugh! we have to null-terminate the linktext, or
 348                  * vfs_symlink() will choke.  it is always safe to
 349                  * null-terminate by brute force, since at worst we
 350                  * will overwrite the first byte of the create namelen
 351                  * in the XDR buffer, which has already been extracted
 352                  * during XDR decode.
 353                  */
 354                 create->cr_linkname[create->cr_linklen] = 0;
 355
 356                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 357                                       create->cr_namelen, create->cr_linkname,
 358                                       create->cr_linklen, &resfh, &create->cr_iattr);
 359                 break;
 360
 361         case NF4BLK:
 362                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 363                 if (MAJOR(rdev) != create->cr_specdata1 ||
 364                     MINOR(rdev) != create->cr_specdata2)
 365                         return nfserr_inval;
 366                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 367                                      create->cr_namelen, &create->cr_iattr,
 368                                      S_IFBLK, rdev, &resfh);
 369                 break;
 370
 371         case NF4CHR:
 372                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 373                 if (MAJOR(rdev) != create->cr_specdata1 ||
 374                     MINOR(rdev) != create->cr_specdata2)
 375                         return nfserr_inval;
 376                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 377                                      create->cr_namelen, &create->cr_iattr,
 378                                      S_IFCHR, rdev, &resfh);
 379                 break;
 380
 381         case NF4SOCK:
 382                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 383                                      create->cr_namelen, &create->cr_iattr,
 384                                      S_IFSOCK, 0, &resfh);
 385                 break;
 386
 387         case NF4FIFO:
 388                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 389                                      create->cr_namelen, &create->cr_iattr,
 390                                      S_IFIFO, 0, &resfh);
 391                 break;
 392
 393         case NF4DIR:
 394                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 395                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 396                                      create->cr_namelen, &create->cr_iattr,
 397                                      S_IFDIR, 0, &resfh);
 398                 break;
 399
 400         default:
 401                 status = nfserr_badtype;
 402         }
 403
 404         if (!status) {
 405                 fh_unlock(current_fh);
 406                 set_change_info(&create->cr_cinfo, current_fh);
 407                 fh_dup2(current_fh, &resfh);
 408         }
 409
 410         fh_put(&resfh);
 411         return status;
 412 }
 413
 414 static inline int
 415 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 416 {
 417         int status;
 418
 419         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 420         if (status)
 421                 return status;
 422
 423         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 424                 return nfserr_inval;
 425
 426         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 427         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 428
 429         getattr->ga_fhp = current_fh;
 430         return nfs_ok;
 431 }
 432
 433 static inline int
 434 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 435            struct svc_fh *save_fh, struct nfsd4_link *link)
 436 {
 437         int status = nfserr_nofilehandle;
 438
 439         if (!save_fh->fh_dentry)
 440                 return status;
 441         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 442         if (!status)
 443                 set_change_info(&link->li_cinfo, current_fh);
 444         return status;
 445 }
 446
 447 static int
 448 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 449 {
 450         struct svc_fh tmp_fh;
 451         int ret;
 452
 453         fh_init(&tmp_fh, NFS4_FHSIZE);
 454         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 455                               &rqstp->rq_chandle)) != 0)
 456                 return ret;
 457         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 458                 fh_put(&tmp_fh);
 459                 return nfserr_noent;
 460         }
 461         fh_put(&tmp_fh);
 462         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 463 }
 464
 465 static inline int
 466 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 467 {
 468         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 469 }
 470
 471 static inline int
 472 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 473 {
 474         int status;
 475
 476         /* no need to check permission - this will be done in nfsd_read() */
 477
 478         read->rd_filp = NULL;
 479         if (read->rd_offset >= OFFSET_MAX)
 480                 return nfserr_inval;
 481
 482         nfs4_lock_state();
 483         /* check stateid */
 484         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 485                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 486                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 487                 goto out;
 488         }
 489         if (read->rd_filp)
 490                 get_file(read->rd_filp);
 491         status = nfs_ok;
 492 out:
 493         nfs4_unlock_state();
 494         read->rd_rqstp = rqstp;
 495         read->rd_fhp = current_fh;
 496         return status;
 497 }
 498
 499 static inline int
 500 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 501 {
 502         u64 cookie = readdir->rd_cookie;
 503         static const nfs4_verifier zeroverf;
 504
 505         /* no need to check permission - this will be done in nfsd_readdir() */
 506
 507         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 508                 return nfserr_inval;
 509
 510         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 511         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 512
 513         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 514             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 515                 return nfserr_bad_cookie;
 516
 517         readdir->rd_rqstp = rqstp;
 518         readdir->rd_fhp = current_fh;
 519         return nfs_ok;
 520 }
 521
 522 static inline int
 523 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 524 {
 525         readlink->rl_rqstp = rqstp;
 526         readlink->rl_fhp = current_fh;
 527         return nfs_ok;
 528 }
 529
 530 static inline int
 531 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 532 {
 533         int status;
 534
 535         if (nfs4_in_grace())
 536                 return nfserr_grace;
 537         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 538         if (status == nfserr_symlink)
 539                 return nfserr_notdir;
 540         if (!status) {
 541                 fh_unlock(current_fh);
 542                 set_change_info(&remove->rm_cinfo, current_fh);
 543         }
 544         return status;
 545 }
 546
 547 static inline int
 548 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 549              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 550 {
 551         int status = nfserr_nofilehandle;
 552
 553         if (!save_fh->fh_dentry)
 554                 return status;
 555         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 556                                         & NFSEXP_NOSUBTREECHECK))
 557                 return nfserr_grace;
 558         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 559                              rename->rn_snamelen, current_fh,
 560                              rename->rn_tname, rename->rn_tnamelen);
 561
 562         /* the underlying filesystem returns different error's than required
 563          * by NFSv4. both save_fh and current_fh have been verified.. */
 564         if (status == nfserr_isdir)
 565                 status = nfserr_exist;
 566         else if ((status == nfserr_notdir) &&
 567                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 568                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 569                 status = nfserr_exist;
 570         else if (status == nfserr_symlink)
 571                 status = nfserr_notdir;
 572
 573         if (!status) {
 574                 set_change_info(&rename->rn_sinfo, current_fh);
 575                 set_change_info(&rename->rn_tinfo, save_fh);
 576         }
 577         return status;
 578 }
 579
 580 static inline int
 581 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 582 {
 583         int status = nfs_ok;
 584
 585         if (!current_fh->fh_dentry)
 586                 return nfserr_nofilehandle;
 587
 588         status = nfs_ok;
 589         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 590                 nfs4_lock_state();
 591                 if ((status = nfs4_preprocess_stateid_op(current_fh,
 592                                                 &setattr->sa_stateid,
 593                                                 CHECK_FH | WR_STATE, NULL))) {
 594                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 595                         goto out_unlock;
 596                 }
 597                 nfs4_unlock_state();
 598         }
 599         status = nfs_ok;
 600         if (setattr->sa_acl != NULL)
 601                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 602         if (status)
 603                 goto out;
 604         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 605                                 0, (time_t)0);
 606 out:
 607         return status;
 608 out_unlock:
 609         nfs4_unlock_state();
 610         return status;
 611 }
 612
 613 static inline int
 614 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 615 {
 616         stateid_t *stateid = &write->wr_stateid;
 617         struct file *filp = NULL;
 618         u32 *p;
 619         int status = nfs_ok;
 620
 621         /* no need to check permission - this will be done in nfsd_write() */
 622
 623         if (write->wr_offset >= OFFSET_MAX)
 624                 return nfserr_inval;
 625
 626         nfs4_lock_state();
 627         if ((status = nfs4_preprocess_stateid_op(current_fh, stateid,
 628                                         CHECK_FH | WR_STATE, &filp))) {
 629                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 630                 goto out;
 631         }
 632         if (filp)
 633                 get_file(filp);
 634         nfs4_unlock_state();
 635
 636         write->wr_bytes_written = write->wr_buflen;
 637         write->wr_how_written = write->wr_stable_how;
 638         p = (u32 *)write->wr_verifier.data;
 639         *p++ = nfssvc_boot.tv_sec;
 640         *p++ = nfssvc_boot.tv_usec;
 641
 642         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
 643                         write->wr_vec, write->wr_vlen, write->wr_buflen,
 644                         &write->wr_how_written);
 645         if (filp)
 646                 fput(filp);
 647
 648         if (status == nfserr_symlink)
 649                 status = nfserr_inval;
 650         return status;
 651 out:
 652         nfs4_unlock_state();
 653         return status;
 654 }
 655
 656 /* This routine never returns NFS_OK!  If there are no other errors, it
 657  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 658  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 659  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 660  */
 661 static int
 662 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 663 {
 664         u32 *buf, *p;
 665         int count;
 666         int status;
 667
 668         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 669         if (status)
 670                 return status;
 671
 672         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 673             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 674                 return nfserr_attrnotsupp;
 675         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 676             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 677                 return nfserr_inval;
 678         if (verify->ve_attrlen & 3)
 679                 return nfserr_inval;
 680
 681         /* count in words:
 682          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 683          */
 684         count = 4 + (verify->ve_attrlen >> 2);
 685         buf = kmalloc(count << 2, GFP_KERNEL);
 686         if (!buf)
 687                 return nfserr_resource;
 688
 689         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 690                                     current_fh->fh_dentry, buf,
 691                                     &count, verify->ve_bmval,
 692                                     rqstp);
 693
 694         /* this means that nfsd4_encode_fattr() ran out of space */
 695         if (status == nfserr_resource && count == 0)
 696                 status = nfserr_not_same;
 697         if (status)
 698                 goto out_kfree;
 699
 700         p = buf + 3;
 701         status = nfserr_not_same;
 702         if (ntohl(*p++) != verify->ve_attrlen)
 703                 goto out_kfree;
 704         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 705                 status = nfserr_same;
 706
 707 out_kfree:
 708         kfree(buf);
 709         return status;
 710 }
 711
 712 /*
 713  * NULL call.
 714  */
 715 static int
 716 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 717 {
 718         return nfs_ok;
 719 }
 720
 721
 722 /*
 723  * COMPOUND call.
 724  */
 725 static int
 726 nfsd4_proc_compound(struct svc_rqst *rqstp,
 727                     struct nfsd4_compoundargs *args,
 728                     struct nfsd4_compoundres *resp)
 729 {
 730         struct nfsd4_op *op;
 731         struct svc_fh   *current_fh = NULL;
 732         struct svc_fh   *save_fh = NULL;
 733         struct nfs4_stateowner *replay_owner = NULL;
 734         int             slack_space;    /* in words, not bytes! */
 735         int             status;
 736
 737         status = nfserr_resource;
 738         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 739         if (current_fh == NULL)
 740                 goto out;
 741         fh_init(current_fh, NFS4_FHSIZE);
 742         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 743         if (save_fh == NULL)
 744                 goto out;
 745         fh_init(save_fh, NFS4_FHSIZE);
 746
 747         resp->xbuf = &rqstp->rq_res;
 748         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 749         resp->tagp = resp->p;
 750         /* reserve space for: taglen, tag, and opcnt */
 751         resp->p += 2 + XDR_QUADLEN(args->taglen);
 752         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 753         resp->taglen = args->taglen;
 754         resp->tag = args->tag;
 755         resp->opcnt = 0;
 756         resp->rqstp = rqstp;
 757
 758         /*
 759          * According to RFC3010, this takes precedence over all other errors.
 760          */
 761         status = nfserr_minor_vers_mismatch;
 762         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 763                 goto out;
 764
 765         status = nfs_ok;
 766         while (!status && resp->opcnt < args->opcnt) {
 767                 op = &args->ops[resp->opcnt++];
 768
 769                 /*
 770                  * The XDR decode routines may have pre-set op->status;
 771                  * for example, if there is a miscellaneous XDR error
 772                  * it will be set to nfserr_bad_xdr.
 773                  */
 774                 if (op->status)
 775                         goto encode_op;
 776
 777                 /* We must be able to encode a successful response to
 778                  * this operation, with enough room left over to encode a
 779                  * failed response to the next operation.  If we don't
 780                  * have enough room, fail with ERR_RESOURCE.
 781                  */
 782 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 783                 slack_space = (char *)resp->end - (char *)resp->p;
 784                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 785                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 786                         op->status = nfserr_resource;
 787                         goto encode_op;
 788                 }
 789
 790                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 791                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 792                 * require a valid current filehandle
 793                 *
 794                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 795                 * due to required returned bitmap argument
 796                 */
 797                 if ((!current_fh->fh_dentry) &&
 798                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 799                    (op->opnum == OP_SETCLIENTID) ||
 800                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 801                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 802                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 803                    (op->opnum == OP_SETATTR))) {
 804                         op->status = nfserr_nofilehandle;
 805                         goto encode_op;
 806                 }
 807                 switch (op->opnum) {
 808                 case OP_ACCESS:
 809                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 810                         break;
 811                 case OP_CLOSE:
 812                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close);
 813                         replay_owner = op->u.close.cl_stateowner;
 814                         break;
 815                 case OP_COMMIT:
 816                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 817                         break;
 818                 case OP_CREATE:
 819                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 820                         break;
 821                 case OP_DELEGRETURN:
 822                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 823                         break;
 824                 case OP_GETATTR:
 825                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 826                         break;
 827                 case OP_GETFH:
 828                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 829                         break;
 830                 case OP_LINK:
 831                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 832                         break;
 833                 case OP_LOCK:
 834                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock);
 835                         replay_owner = op->u.lock.lk_stateowner;
 836                         break;
 837                 case OP_LOCKT:
 838                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 839                         break;
 840                 case OP_LOCKU:
 841                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku);
 842                         replay_owner = op->u.locku.lu_stateowner;
 843                         break;
 844                 case OP_LOOKUP:
 845                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 846                         break;
 847                 case OP_LOOKUPP:
 848                         op->status = nfsd4_lookupp(rqstp, current_fh);
 849                         break;
 850                 case OP_NVERIFY:
 851                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 852                         if (op->status == nfserr_not_same)
 853                                 op->status = nfs_ok;
 854                         break;
 855                 case OP_OPEN:
 856                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open);
 857                         replay_owner = op->u.open.op_stateowner;
 858                         break;
 859                 case OP_OPEN_CONFIRM:
 860                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm);
 861                         replay_owner = op->u.open_confirm.oc_stateowner;
 862                         break;
 863                 case OP_OPEN_DOWNGRADE:
 864                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade);
 865                         replay_owner = op->u.open_downgrade.od_stateowner;
 866                         break;
 867                 case OP_PUTFH:
 868                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 869                         break;
 870                 case OP_PUTROOTFH:
 871                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 872                         break;
 873                 case OP_READ:
 874                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 875                         break;
 876                 case OP_READDIR:
 877                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 878                         break;
 879                 case OP_READLINK:
 880                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 881                         break;
 882                 case OP_REMOVE:
 883                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 884                         break;
 885                 case OP_RENAME:
 886                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 887                         break;
 888                 case OP_RENEW:
 889                         op->status = nfsd4_renew(&op->u.renew);
 890                         break;
 891                 case OP_RESTOREFH:
 892                         op->status = nfsd4_restorefh(current_fh, save_fh);
 893                         break;
 894                 case OP_SAVEFH:
 895                         op->status = nfsd4_savefh(current_fh, save_fh);
 896                         break;
 897                 case OP_SETATTR:
 898                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 899                         break;
 900                 case OP_SETCLIENTID:
 901                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 902                         break;
 903                 case OP_SETCLIENTID_CONFIRM:
 904                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 905                         break;
 906                 case OP_VERIFY:
 907                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 908                         if (op->status == nfserr_same)
 909                                 op->status = nfs_ok;
 910                         break;
 911                 case OP_WRITE:
 912                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 913                         break;
 914                 case OP_RELEASE_LOCKOWNER:
 915                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 916                         break;
 917                 default:
 918                         BUG_ON(op->status == nfs_ok);
 919                         break;
 920                 }
 921
 922 encode_op:
 923                 if (op->status == NFSERR_REPLAY_ME) {
 924                         op->replay = &replay_owner->so_replay;
 925                         nfsd4_encode_replay(resp, op);
 926                         status = op->status = op->replay->rp_status;
 927                 } else {
 928                         nfsd4_encode_operation(resp, op);
 929                         status = op->status;
 930                 }
 931                 if (replay_owner && (replay_owner != (void *)(-1))) {
 932                         nfs4_put_stateowner(replay_owner);
 933                         replay_owner = NULL;
 934                 }
 935                 /* XXX Ugh, we need to get rid of this kind of special case: */
 936                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 937                         fput(op->u.read.rd_filp);
 938         }
 939
 940 out:
 941         nfsd4_release_compoundargs(args);
 942         if (current_fh)
 943                 fh_put(current_fh);
 944         kfree(current_fh);
 945         if (save_fh)
 946                 fh_put(save_fh);
 947         kfree(save_fh);
 948         return status;
 949 }
 950
 951 #define nfs4svc_decode_voidargs         NULL
 952 #define nfs4svc_release_void            NULL
 953 #define nfsd4_voidres                   nfsd4_voidargs
 954 #define nfs4svc_release_compound        NULL
 955 struct nfsd4_voidargs { int dummy; };
 956
 957 #define PROC(name, argt, rest, relt, cache, respsize)   \
 958  { (svc_procfunc) nfsd4_proc_##name,            \
 959    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 960    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 961    (kxdrproc_t) nfs4svc_release_##relt,         \
 962    sizeof(struct nfsd4_##argt##args),           \
 963    sizeof(struct nfsd4_##rest##res),            \
 964    0,                                           \
 965    cache,                                       \
 966    respsize,                                    \
 967  }
 968
 969 /*
 970  * TODO: At the present time, the NFSv4 server does not do XID caching
 971  * of requests.  Implementing XID caching would not be a serious problem,
 972  * although it would require a mild change in interfaces since one
 973  * doesn't know whether an NFSv4 request is idempotent until after the
 974  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 975  * Astrand's regression testsuite for NFSv4 servers), which reuses
 976  * XID's liberally, so I've left it unimplemented until pynfs generates
 977  * better XID's.
 978  */
 979 static struct svc_procedure             nfsd_procedures4[2] = {
 980   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 981   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
 982 };
 983
 984 struct svc_version      nfsd_version4 = {
 985                 .vs_vers        = 4,
 986                 .vs_nproc       = 2,
 987                 .vs_proc        = nfsd_procedures4,
 988                 .vs_dispatch    = nfsd_dispatch,
 989                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
 990 };
 991
 992 /*
 993  * Local variables:
 994  *  c-basic-offset: 8
 995  * End:
 996  */