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