git.oblomov.eu Git - linux-2.6/blob - 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, struct nfs4_stateowner **replay_owner)
 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
 196         /* Openowner is now set, so sequence id will get bumped.  Now we need
 197          * these checks before we do any creates: */
 198         status = nfserr_grace;
 199         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 200                 goto out;
 201         status = nfserr_no_grace;
 202         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 203                 goto out;
 204
 205         switch (open->op_claim_type) {
 206                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 207                         status = nfserr_inval;
 208                         if (open->op_create)
 209                                 goto out;
 210                         /* fall through */
 211                 case NFS4_OPEN_CLAIM_NULL:
 212                         /*
 213                          * (1) set CURRENT_FH to the file being opened,
 214                          * creating it if necessary, (2) set open->op_cinfo,
 215                          * (3) set open->op_truncate if the file is to be
 216                          * truncated after opening, (4) do permission checking.
 217                          */
 218                         status = do_open_lookup(rqstp, current_fh, open);
 219                         if (status)
 220                                 goto out;
 221                         break;
 222                 case NFS4_OPEN_CLAIM_PREVIOUS:
 223                         open->op_stateowner->so_confirmed = 1;
 224                         /*
 225                          * The CURRENT_FH is already set to the file being
 226                          * opened.  (1) set open->op_cinfo, (2) set
 227                          * open->op_truncate if the file is to be truncated
 228                          * after opening, (3) do permission checking.
 229                         */
 230                         status = do_open_fhandle(rqstp, current_fh, open);
 231                         if (status)
 232                                 goto out;
 233                         break;
 234                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 235                         open->op_stateowner->so_confirmed = 1;
 236                         printk("NFSD: unsupported OPEN claim type %d\n",
 237                                 open->op_claim_type);
 238                         status = nfserr_notsupp;
 239                         goto out;
 240                 default:
 241                         printk("NFSD: Invalid OPEN claim type %d\n",
 242                                 open->op_claim_type);
 243                         status = nfserr_inval;
 244                         goto out;
 245         }
 246         /*
 247          * nfsd4_process_open2() does the actual opening of the file.  If
 248          * successful, it (1) truncates the file if open->op_truncate was
 249          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 250          */
 251         status = nfsd4_process_open2(rqstp, current_fh, open);
 252 out:
 253         if (open->op_stateowner) {
 254                 nfs4_get_stateowner(open->op_stateowner);
 255                 *replay_owner = open->op_stateowner;
 256         }
 257         nfs4_unlock_state();
 258         return status;
 259 }
 260
 261 /*
 262  * filehandle-manipulating ops.
 263  */
 264 static inline int
 265 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 266 {
 267         if (!current_fh->fh_dentry)
 268                 return nfserr_nofilehandle;
 269
 270         *getfh = current_fh;
 271         return nfs_ok;
 272 }
 273
 274 static inline int
 275 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 276 {
 277         fh_put(current_fh);
 278         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 279         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 280         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 281 }
 282
 283 static inline int
 284 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 285 {
 286         int status;
 287
 288         fh_put(current_fh);
 289         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 290                               &rqstp->rq_chandle);
 291         if (!status)
 292                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
 293         return status;
 294 }
 295
 296 static inline int
 297 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 298 {
 299         if (!save_fh->fh_dentry)
 300                 return nfserr_restorefh;
 301
 302         fh_dup2(current_fh, save_fh);
 303         return nfs_ok;
 304 }
 305
 306 static inline int
 307 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 308 {
 309         if (!current_fh->fh_dentry)
 310                 return nfserr_nofilehandle;
 311
 312         fh_dup2(save_fh, current_fh);
 313         return nfs_ok;
 314 }
 315
 316 /*
 317  * misc nfsv4 ops
 318  */
 319 static inline int
 320 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 321 {
 322         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 323                 return nfserr_inval;
 324
 325         access->ac_resp_access = access->ac_req_access;
 326         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 327 }
 328
 329 static inline int
 330 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 331 {
 332         int status;
 333
 334         u32 *p = (u32 *)commit->co_verf.data;
 335         *p++ = nfssvc_boot.tv_sec;
 336         *p++ = nfssvc_boot.tv_usec;
 337
 338         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 339         if (status == nfserr_symlink)
 340                 status = nfserr_inval;
 341         return status;
 342 }
 343
 344 static int
 345 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 346 {
 347         struct svc_fh resfh;
 348         int status;
 349         dev_t rdev;
 350
 351         fh_init(&resfh, NFS4_FHSIZE);
 352
 353         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 354         if (status == nfserr_symlink)
 355                 status = nfserr_notdir;
 356         if (status)
 357                 return status;
 358
 359         switch (create->cr_type) {
 360         case NF4LNK:
 361                 /* ugh! we have to null-terminate the linktext, or
 362                  * vfs_symlink() will choke.  it is always safe to
 363                  * null-terminate by brute force, since at worst we
 364                  * will overwrite the first byte of the create namelen
 365                  * in the XDR buffer, which has already been extracted
 366                  * during XDR decode.
 367                  */
 368                 create->cr_linkname[create->cr_linklen] = 0;
 369
 370                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 371                                       create->cr_namelen, create->cr_linkname,
 372                                       create->cr_linklen, &resfh, &create->cr_iattr);
 373                 break;
 374
 375         case NF4BLK:
 376                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 377                 if (MAJOR(rdev) != create->cr_specdata1 ||
 378                     MINOR(rdev) != create->cr_specdata2)
 379                         return nfserr_inval;
 380                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 381                                      create->cr_namelen, &create->cr_iattr,
 382                                      S_IFBLK, rdev, &resfh);
 383                 break;
 384
 385         case NF4CHR:
 386                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 387                 if (MAJOR(rdev) != create->cr_specdata1 ||
 388                     MINOR(rdev) != create->cr_specdata2)
 389                         return nfserr_inval;
 390                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 391                                      create->cr_namelen, &create->cr_iattr,
 392                                      S_IFCHR, rdev, &resfh);
 393                 break;
 394
 395         case NF4SOCK:
 396                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 397                                      create->cr_namelen, &create->cr_iattr,
 398                                      S_IFSOCK, 0, &resfh);
 399                 break;
 400
 401         case NF4FIFO:
 402                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 403                                      create->cr_namelen, &create->cr_iattr,
 404                                      S_IFIFO, 0, &resfh);
 405                 break;
 406
 407         case NF4DIR:
 408                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 409                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 410                                      create->cr_namelen, &create->cr_iattr,
 411                                      S_IFDIR, 0, &resfh);
 412                 break;
 413
 414         default:
 415                 status = nfserr_badtype;
 416         }
 417
 418         if (!status) {
 419                 fh_unlock(current_fh);
 420                 set_change_info(&create->cr_cinfo, current_fh);
 421                 fh_dup2(current_fh, &resfh);
 422         }
 423
 424         fh_put(&resfh);
 425         return status;
 426 }
 427
 428 static inline int
 429 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 430 {
 431         int status;
 432
 433         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 434         if (status)
 435                 return status;
 436
 437         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 438                 return nfserr_inval;
 439
 440         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 441         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 442
 443         getattr->ga_fhp = current_fh;
 444         return nfs_ok;
 445 }
 446
 447 static inline int
 448 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 449            struct svc_fh *save_fh, struct nfsd4_link *link)
 450 {
 451         int status = nfserr_nofilehandle;
 452
 453         if (!save_fh->fh_dentry)
 454                 return status;
 455         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 456         if (!status)
 457                 set_change_info(&link->li_cinfo, current_fh);
 458         return status;
 459 }
 460
 461 static int
 462 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 463 {
 464         struct svc_fh tmp_fh;
 465         int ret;
 466
 467         fh_init(&tmp_fh, NFS4_FHSIZE);
 468         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 469                               &rqstp->rq_chandle)) != 0)
 470                 return ret;
 471         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 472                 fh_put(&tmp_fh);
 473                 return nfserr_noent;
 474         }
 475         fh_put(&tmp_fh);
 476         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 477 }
 478
 479 static inline int
 480 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 481 {
 482         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 483 }
 484
 485 static inline int
 486 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 487 {
 488         int status;
 489
 490         /* no need to check permission - this will be done in nfsd_read() */
 491
 492         read->rd_filp = NULL;
 493         if (read->rd_offset >= OFFSET_MAX)
 494                 return nfserr_inval;
 495
 496         nfs4_lock_state();
 497         /* check stateid */
 498         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 499                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 500                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 501                 goto out;
 502         }
 503         if (read->rd_filp)
 504                 get_file(read->rd_filp);
 505         status = nfs_ok;
 506 out:
 507         nfs4_unlock_state();
 508         read->rd_rqstp = rqstp;
 509         read->rd_fhp = current_fh;
 510         return status;
 511 }
 512
 513 static inline int
 514 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 515 {
 516         u64 cookie = readdir->rd_cookie;
 517         static const nfs4_verifier zeroverf;
 518
 519         /* no need to check permission - this will be done in nfsd_readdir() */
 520
 521         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 522                 return nfserr_inval;
 523
 524         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 525         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 526
 527         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 528             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 529                 return nfserr_bad_cookie;
 530
 531         readdir->rd_rqstp = rqstp;
 532         readdir->rd_fhp = current_fh;
 533         return nfs_ok;
 534 }
 535
 536 static inline int
 537 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 538 {
 539         readlink->rl_rqstp = rqstp;
 540         readlink->rl_fhp = current_fh;
 541         return nfs_ok;
 542 }
 543
 544 static inline int
 545 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 546 {
 547         int status;
 548
 549         if (nfs4_in_grace())
 550                 return nfserr_grace;
 551         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 552         if (status == nfserr_symlink)
 553                 return nfserr_notdir;
 554         if (!status) {
 555                 fh_unlock(current_fh);
 556                 set_change_info(&remove->rm_cinfo, current_fh);
 557         }
 558         return status;
 559 }
 560
 561 static inline int
 562 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 563              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 564 {
 565         int status = nfserr_nofilehandle;
 566
 567         if (!save_fh->fh_dentry)
 568                 return status;
 569         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 570                                         & NFSEXP_NOSUBTREECHECK))
 571                 return nfserr_grace;
 572         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 573                              rename->rn_snamelen, current_fh,
 574                              rename->rn_tname, rename->rn_tnamelen);
 575
 576         /* the underlying filesystem returns different error's than required
 577          * by NFSv4. both save_fh and current_fh have been verified.. */
 578         if (status == nfserr_isdir)
 579                 status = nfserr_exist;
 580         else if ((status == nfserr_notdir) &&
 581                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 582                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 583                 status = nfserr_exist;
 584         else if (status == nfserr_symlink)
 585                 status = nfserr_notdir;
 586
 587         if (!status) {
 588                 set_change_info(&rename->rn_sinfo, current_fh);
 589                 set_change_info(&rename->rn_tinfo, save_fh);
 590         }
 591         return status;
 592 }
 593
 594 static inline int
 595 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 596 {
 597         int status = nfs_ok;
 598
 599         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 600                 nfs4_lock_state();
 601                 status = nfs4_preprocess_stateid_op(current_fh,
 602                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 603                 nfs4_unlock_state();
 604                 if (status) {
 605                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!");
 606                         return status;
 607                 }
 608         }
 609         status = nfs_ok;
 610         if (setattr->sa_acl != NULL)
 611                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 612         if (status)
 613                 return status;
 614         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 615                                 0, (time_t)0);
 616         return status;
 617 }
 618
 619 static inline int
 620 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 621 {
 622         stateid_t *stateid = &write->wr_stateid;
 623         struct file *filp = NULL;
 624         u32 *p;
 625         int status = nfs_ok;
 626
 627         /* no need to check permission - this will be done in nfsd_write() */
 628
 629         if (write->wr_offset >= OFFSET_MAX)
 630                 return nfserr_inval;
 631
 632         nfs4_lock_state();
 633         status = nfs4_preprocess_stateid_op(current_fh, stateid,
 634                                         CHECK_FH | WR_STATE, &filp);
 635         if (filp)
 636                 get_file(filp);
 637         nfs4_unlock_state();
 638
 639         if (status) {
 640                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 641                 return status;
 642         }
 643
 644         write->wr_bytes_written = write->wr_buflen;
 645         write->wr_how_written = write->wr_stable_how;
 646         p = (u32 *)write->wr_verifier.data;
 647         *p++ = nfssvc_boot.tv_sec;
 648         *p++ = nfssvc_boot.tv_usec;
 649
 650         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
 651                         write->wr_vec, write->wr_vlen, write->wr_buflen,
 652                         &write->wr_how_written);
 653         if (filp)
 654                 fput(filp);
 655
 656         if (status == nfserr_symlink)
 657                 status = nfserr_inval;
 658         return status;
 659 }
 660
 661 /* This routine never returns NFS_OK!  If there are no other errors, it
 662  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 663  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 664  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 665  */
 666 static int
 667 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 668 {
 669         u32 *buf, *p;
 670         int count;
 671         int status;
 672
 673         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 674         if (status)
 675                 return status;
 676
 677         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 678             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 679                 return nfserr_attrnotsupp;
 680         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 681             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 682                 return nfserr_inval;
 683         if (verify->ve_attrlen & 3)
 684                 return nfserr_inval;
 685
 686         /* count in words:
 687          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 688          */
 689         count = 4 + (verify->ve_attrlen >> 2);
 690         buf = kmalloc(count << 2, GFP_KERNEL);
 691         if (!buf)
 692                 return nfserr_resource;
 693
 694         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 695                                     current_fh->fh_dentry, buf,
 696                                     &count, verify->ve_bmval,
 697                                     rqstp);
 698
 699         /* this means that nfsd4_encode_fattr() ran out of space */
 700         if (status == nfserr_resource && count == 0)
 701                 status = nfserr_not_same;
 702         if (status)
 703                 goto out_kfree;
 704
 705         p = buf + 3;
 706         status = nfserr_not_same;
 707         if (ntohl(*p++) != verify->ve_attrlen)
 708                 goto out_kfree;
 709         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 710                 status = nfserr_same;
 711
 712 out_kfree:
 713         kfree(buf);
 714         return status;
 715 }
 716
 717 /*
 718  * NULL call.
 719  */
 720 static int
 721 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 722 {
 723         return nfs_ok;
 724 }
 725
 726
 727 /*
 728  * COMPOUND call.
 729  */
 730 static int
 731 nfsd4_proc_compound(struct svc_rqst *rqstp,
 732                     struct nfsd4_compoundargs *args,
 733                     struct nfsd4_compoundres *resp)
 734 {
 735         struct nfsd4_op *op;
 736         struct svc_fh   *current_fh = NULL;
 737         struct svc_fh   *save_fh = NULL;
 738         struct nfs4_stateowner *replay_owner = NULL;
 739         int             slack_space;    /* in words, not bytes! */
 740         int             status;
 741
 742         status = nfserr_resource;
 743         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 744         if (current_fh == NULL)
 745                 goto out;
 746         fh_init(current_fh, NFS4_FHSIZE);
 747         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 748         if (save_fh == NULL)
 749                 goto out;
 750         fh_init(save_fh, NFS4_FHSIZE);
 751
 752         resp->xbuf = &rqstp->rq_res;
 753         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 754         resp->tagp = resp->p;
 755         /* reserve space for: taglen, tag, and opcnt */
 756         resp->p += 2 + XDR_QUADLEN(args->taglen);
 757         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 758         resp->taglen = args->taglen;
 759         resp->tag = args->tag;
 760         resp->opcnt = 0;
 761         resp->rqstp = rqstp;
 762
 763         /*
 764          * According to RFC3010, this takes precedence over all other errors.
 765          */
 766         status = nfserr_minor_vers_mismatch;
 767         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 768                 goto out;
 769
 770         status = nfs_ok;
 771         while (!status && resp->opcnt < args->opcnt) {
 772                 op = &args->ops[resp->opcnt++];
 773
 774                 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
 775
 776                 /*
 777                  * The XDR decode routines may have pre-set op->status;
 778                  * for example, if there is a miscellaneous XDR error
 779                  * it will be set to nfserr_bad_xdr.
 780                  */
 781                 if (op->status)
 782                         goto encode_op;
 783
 784                 /* We must be able to encode a successful response to
 785                  * this operation, with enough room left over to encode a
 786                  * failed response to the next operation.  If we don't
 787                  * have enough room, fail with ERR_RESOURCE.
 788                  */
 789 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 790                 slack_space = (char *)resp->end - (char *)resp->p;
 791                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 792                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 793                         op->status = nfserr_resource;
 794                         goto encode_op;
 795                 }
 796
 797                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 798                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 799                 * require a valid current filehandle
 800                 */
 801                 if ((!current_fh->fh_dentry) &&
 802                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 803                    (op->opnum == OP_SETCLIENTID) ||
 804                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 805                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 806                    (op->opnum == OP_RELEASE_LOCKOWNER))) {
 807                         op->status = nfserr_nofilehandle;
 808                         goto encode_op;
 809                 }
 810                 switch (op->opnum) {
 811                 case OP_ACCESS:
 812                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 813                         break;
 814                 case OP_CLOSE:
 815                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
 816                         break;
 817                 case OP_COMMIT:
 818                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 819                         break;
 820                 case OP_CREATE:
 821                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 822                         break;
 823                 case OP_DELEGRETURN:
 824                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 825                         break;
 826                 case OP_GETATTR:
 827                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 828                         break;
 829                 case OP_GETFH:
 830                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 831                         break;
 832                 case OP_LINK:
 833                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 834                         break;
 835                 case OP_LOCK:
 836                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
 837                         break;
 838                 case OP_LOCKT:
 839                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 840                         break;
 841                 case OP_LOCKU:
 842                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner);
 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, &replay_owner);
 857                         break;
 858                 case OP_OPEN_CONFIRM:
 859                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
 860                         break;
 861                 case OP_OPEN_DOWNGRADE:
 862                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
 863                         break;
 864                 case OP_PUTFH:
 865                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 866                         break;
 867                 case OP_PUTROOTFH:
 868                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 869                         break;
 870                 case OP_READ:
 871                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 872                         break;
 873                 case OP_READDIR:
 874                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 875                         break;
 876                 case OP_READLINK:
 877                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 878                         break;
 879                 case OP_REMOVE:
 880                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 881                         break;
 882                 case OP_RENAME:
 883                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 884                         break;
 885                 case OP_RENEW:
 886                         op->status = nfsd4_renew(&op->u.renew);
 887                         break;
 888                 case OP_RESTOREFH:
 889                         op->status = nfsd4_restorefh(current_fh, save_fh);
 890                         break;
 891                 case OP_SAVEFH:
 892                         op->status = nfsd4_savefh(current_fh, save_fh);
 893                         break;
 894                 case OP_SETATTR:
 895                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 896                         break;
 897                 case OP_SETCLIENTID:
 898                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 899                         break;
 900                 case OP_SETCLIENTID_CONFIRM:
 901                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 902                         break;
 903                 case OP_VERIFY:
 904                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 905                         if (op->status == nfserr_same)
 906                                 op->status = nfs_ok;
 907                         break;
 908                 case OP_WRITE:
 909                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 910                         break;
 911                 case OP_RELEASE_LOCKOWNER:
 912                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 913                         break;
 914                 default:
 915                         BUG_ON(op->status == nfs_ok);
 916                         break;
 917                 }
 918
 919 encode_op:
 920                 if (op->status == NFSERR_REPLAY_ME) {
 921                         op->replay = &replay_owner->so_replay;
 922                         nfsd4_encode_replay(resp, op);
 923                         status = op->status = op->replay->rp_status;
 924                 } else {
 925                         nfsd4_encode_operation(resp, op);
 926                         status = op->status;
 927                 }
 928                 if (replay_owner && (replay_owner != (void *)(-1))) {
 929                         nfs4_put_stateowner(replay_owner);
 930                         replay_owner = NULL;
 931                 }
 932                 /* XXX Ugh, we need to get rid of this kind of special case: */
 933                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 934                         fput(op->u.read.rd_filp);
 935         }
 936
 937 out:
 938         nfsd4_release_compoundargs(args);
 939         if (current_fh)
 940                 fh_put(current_fh);
 941         kfree(current_fh);
 942         if (save_fh)
 943                 fh_put(save_fh);
 944         kfree(save_fh);
 945         return status;
 946 }
 947
 948 #define nfs4svc_decode_voidargs         NULL
 949 #define nfs4svc_release_void            NULL
 950 #define nfsd4_voidres                   nfsd4_voidargs
 951 #define nfs4svc_release_compound        NULL
 952 struct nfsd4_voidargs { int dummy; };
 953
 954 #define PROC(name, argt, rest, relt, cache, respsize)   \
 955  { (svc_procfunc) nfsd4_proc_##name,            \
 956    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 957    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 958    (kxdrproc_t) nfs4svc_release_##relt,         \
 959    sizeof(struct nfsd4_##argt##args),           \
 960    sizeof(struct nfsd4_##rest##res),            \
 961    0,                                           \
 962    cache,                                       \
 963    respsize,                                    \
 964  }
 965
 966 /*
 967  * TODO: At the present time, the NFSv4 server does not do XID caching
 968  * of requests.  Implementing XID caching would not be a serious problem,
 969  * although it would require a mild change in interfaces since one
 970  * doesn't know whether an NFSv4 request is idempotent until after the
 971  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 972  * Astrand's regression testsuite for NFSv4 servers), which reuses
 973  * XID's liberally, so I've left it unimplemented until pynfs generates
 974  * better XID's.
 975  */
 976 static struct svc_procedure             nfsd_procedures4[2] = {
 977   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 978   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
 979 };
 980
 981 struct svc_version      nfsd_version4 = {
 982                 .vs_vers        = 4,
 983                 .vs_nproc       = 2,
 984                 .vs_proc        = nfsd_procedures4,
 985                 .vs_dispatch    = nfsd_dispatch,
 986                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
 987 };
 988
 989 /*
 990  * Local variables:
 991  *  c-basic-offset: 8
 992  * End:
 993  */