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