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   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
  38 #include <linux/param.h>
  39 #include <linux/major.h>
  40 #include <linux/slab.h>
  41 #include <linux/file.h>
  42
  43 #include <linux/sunrpc/svc.h>
  44 #include <linux/nfsd/nfsd.h>
  45 #include <linux/nfsd/cache.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfsd/state.h>
  48 #include <linux/nfsd/xdr4.h>
  49 #include <linux/nfs4_acl.h>
  50 #include <linux/sunrpc/gss_api.h>
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 static inline void
  55 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  56 {
  57         fh_put(dst);
  58         dget(src->fh_dentry);
  59         if (src->fh_export)
  60                 cache_get(&src->fh_export->h);
  61         *dst = *src;
  62 }
  63
  64 static __be32
  65 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
  66 {
  67         __be32 status;
  68
  69         if (open->op_truncate &&
  70                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  71                 return nfserr_inval;
  72
  73         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  74                 accmode |= MAY_READ;
  75         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
  76                 accmode |= (MAY_WRITE | MAY_TRUNC);
  77         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
  78                 accmode |= MAY_WRITE;
  79
  80         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  81
  82         return status;
  83 }
  84
  85 static __be32
  86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  87 {
  88         struct svc_fh resfh;
  89         __be32 status;
  90         int created = 0;
  91
  92         fh_init(&resfh, NFS4_FHSIZE);
  93         open->op_truncate = 0;
  94
  95         if (open->op_create) {
  96                 /*
  97                  * Note: create modes (UNCHECKED,GUARDED...) are the same
  98                  * in NFSv4 as in v3.
  99                  */
 100                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 101                                         open->op_fname.len, &open->op_iattr,
 102                                         &resfh, open->op_createmode,
 103                                         (u32 *)open->op_verf.data,
 104                                         &open->op_truncate, &created);
 105
 106                 /* If we ever decide to use different attrs to store the
 107                  * verifier in nfsd_create_v3, then we'll need to change this
 108                  */
 109                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 110                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 111                                                 FATTR4_WORD1_TIME_MODIFY);
 112         } else {
 113                 status = nfsd_lookup(rqstp, current_fh,
 114                                      open->op_fname.data, open->op_fname.len, &resfh);
 115                 fh_unlock(current_fh);
 116         }
 117         if (status)
 118                 goto out;
 119
 120         set_change_info(&open->op_cinfo, current_fh);
 121
 122         /* set reply cache */
 123         fh_dup2(current_fh, &resfh);
 124         open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
 125         memcpy(open->op_stateowner->so_replay.rp_openfh,
 126                         &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
 127
 128         if (!created)
 129                 status = do_open_permission(rqstp, current_fh, open, MAY_NOP);
 130
 131 out:
 132         fh_put(&resfh);
 133         return status;
 134 }
 135
 136 static __be32
 137 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 138 {
 139         __be32 status;
 140
 141         /* Only reclaims from previously confirmed clients are valid */
 142         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 143                 return status;
 144
 145         /* We don't know the target directory, and therefore can not
 146         * set the change info
 147         */
 148
 149         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 150
 151         /* set replay cache */
 152         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 153         memcpy(open->op_stateowner->so_replay.rp_openfh,
 154                 &current_fh->fh_handle.fh_base,
 155                 current_fh->fh_handle.fh_size);
 156
 157         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 158                 (open->op_iattr.ia_size == 0);
 159
 160         status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE);
 161
 162         return status;
 163 }
 164
 165
 166 static __be32
 167 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 168            struct nfsd4_open *open)
 169 {
 170         __be32 status;
 171         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 172                 (int)open->op_fname.len, open->op_fname.data,
 173                 open->op_stateowner);
 174
 175         /* This check required by spec. */
 176         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 177                 return nfserr_inval;
 178
 179         nfs4_lock_state();
 180
 181         /* check seqid for replay. set nfs4_owner */
 182         status = nfsd4_process_open1(open);
 183         if (status == nfserr_replay_me) {
 184                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 185                 fh_put(&cstate->current_fh);
 186                 cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len;
 187                 memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh,
 188                                 rp->rp_openfh_len);
 189                 status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
 190                 if (status)
 191                         dprintk("nfsd4_open: replay failed"
 192                                 " restoring previous filehandle\n");
 193                 else
 194                         status = nfserr_replay_me;
 195         }
 196         if (status)
 197                 goto out;
 198
 199         /* Openowner is now set, so sequence id will get bumped.  Now we need
 200          * these checks before we do any creates: */
 201         status = nfserr_grace;
 202         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 203                 goto out;
 204         status = nfserr_no_grace;
 205         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 206                 goto out;
 207
 208         switch (open->op_claim_type) {
 209                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 210                         status = nfserr_inval;
 211                         if (open->op_create)
 212                                 goto out;
 213                         /* fall through */
 214                 case NFS4_OPEN_CLAIM_NULL:
 215                         /*
 216                          * (1) set CURRENT_FH to the file being opened,
 217                          * creating it if necessary, (2) set open->op_cinfo,
 218                          * (3) set open->op_truncate if the file is to be
 219                          * truncated after opening, (4) do permission checking.
 220                          */
 221                         status = do_open_lookup(rqstp, &cstate->current_fh,
 222                                                 open);
 223                         if (status)
 224                                 goto out;
 225                         break;
 226                 case NFS4_OPEN_CLAIM_PREVIOUS:
 227                         open->op_stateowner->so_confirmed = 1;
 228                         /*
 229                          * The CURRENT_FH is already set to the file being
 230                          * opened.  (1) set open->op_cinfo, (2) set
 231                          * open->op_truncate if the file is to be truncated
 232                          * after opening, (3) do permission checking.
 233                         */
 234                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 235                                                  open);
 236                         if (status)
 237                                 goto out;
 238                         break;
 239                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 240                         open->op_stateowner->so_confirmed = 1;
 241                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 242                                 open->op_claim_type);
 243                         status = nfserr_notsupp;
 244                         goto out;
 245                 default:
 246                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 247                                 open->op_claim_type);
 248                         status = nfserr_inval;
 249                         goto out;
 250         }
 251         /*
 252          * nfsd4_process_open2() does the actual opening of the file.  If
 253          * successful, it (1) truncates the file if open->op_truncate was
 254          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 255          */
 256         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 257 out:
 258         if (open->op_stateowner) {
 259                 nfs4_get_stateowner(open->op_stateowner);
 260                 cstate->replay_owner = open->op_stateowner;
 261         }
 262         nfs4_unlock_state();
 263         return status;
 264 }
 265
 266 /*
 267  * filehandle-manipulating ops.
 268  */
 269 static __be32
 270 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 271             struct svc_fh **getfh)
 272 {
 273         if (!cstate->current_fh.fh_dentry)
 274                 return nfserr_nofilehandle;
 275
 276         *getfh = &cstate->current_fh;
 277         return nfs_ok;
 278 }
 279
 280 static __be32
 281 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 282             struct nfsd4_putfh *putfh)
 283 {
 284         fh_put(&cstate->current_fh);
 285         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 286         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 287                putfh->pf_fhlen);
 288         return fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
 289 }
 290
 291 static __be32
 292 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 293                 void *arg)
 294 {
 295         __be32 status;
 296
 297         fh_put(&cstate->current_fh);
 298         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 299         return status;
 300 }
 301
 302 static __be32
 303 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 304                 void *arg)
 305 {
 306         if (!cstate->save_fh.fh_dentry)
 307                 return nfserr_restorefh;
 308
 309         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 310         return nfs_ok;
 311 }
 312
 313 static __be32
 314 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 315              void *arg)
 316 {
 317         if (!cstate->current_fh.fh_dentry)
 318                 return nfserr_nofilehandle;
 319
 320         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 321         return nfs_ok;
 322 }
 323
 324 /*
 325  * misc nfsv4 ops
 326  */
 327 static __be32
 328 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 329              struct nfsd4_access *access)
 330 {
 331         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 332                 return nfserr_inval;
 333
 334         access->ac_resp_access = access->ac_req_access;
 335         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 336                            &access->ac_supported);
 337 }
 338
 339 static __be32
 340 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 341              struct nfsd4_commit *commit)
 342 {
 343         __be32 status;
 344
 345         u32 *p = (u32 *)commit->co_verf.data;
 346         *p++ = nfssvc_boot.tv_sec;
 347         *p++ = nfssvc_boot.tv_usec;
 348
 349         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 350                              commit->co_count);
 351         if (status == nfserr_symlink)
 352                 status = nfserr_inval;
 353         return status;
 354 }
 355
 356 static __be32
 357 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 358              struct nfsd4_create *create)
 359 {
 360         struct svc_fh resfh;
 361         __be32 status;
 362         dev_t rdev;
 363
 364         fh_init(&resfh, NFS4_FHSIZE);
 365
 366         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, MAY_CREATE);
 367         if (status == nfserr_symlink)
 368                 status = nfserr_notdir;
 369         if (status)
 370                 return status;
 371
 372         switch (create->cr_type) {
 373         case NF4LNK:
 374                 /* ugh! we have to null-terminate the linktext, or
 375                  * vfs_symlink() will choke.  it is always safe to
 376                  * null-terminate by brute force, since at worst we
 377                  * will overwrite the first byte of the create namelen
 378                  * in the XDR buffer, which has already been extracted
 379                  * during XDR decode.
 380                  */
 381                 create->cr_linkname[create->cr_linklen] = 0;
 382
 383                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 384                                       create->cr_name, create->cr_namelen,
 385                                       create->cr_linkname, create->cr_linklen,
 386                                       &resfh, &create->cr_iattr);
 387                 break;
 388
 389         case NF4BLK:
 390                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 391                 if (MAJOR(rdev) != create->cr_specdata1 ||
 392                     MINOR(rdev) != create->cr_specdata2)
 393                         return nfserr_inval;
 394                 status = nfsd_create(rqstp, &cstate->current_fh,
 395                                      create->cr_name, create->cr_namelen,
 396                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 397                 break;
 398
 399         case NF4CHR:
 400                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 401                 if (MAJOR(rdev) != create->cr_specdata1 ||
 402                     MINOR(rdev) != create->cr_specdata2)
 403                         return nfserr_inval;
 404                 status = nfsd_create(rqstp, &cstate->current_fh,
 405                                      create->cr_name, create->cr_namelen,
 406                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 407                 break;
 408
 409         case NF4SOCK:
 410                 status = nfsd_create(rqstp, &cstate->current_fh,
 411                                      create->cr_name, create->cr_namelen,
 412                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 413                 break;
 414
 415         case NF4FIFO:
 416                 status = nfsd_create(rqstp, &cstate->current_fh,
 417                                      create->cr_name, create->cr_namelen,
 418                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 419                 break;
 420
 421         case NF4DIR:
 422                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 423                 status = nfsd_create(rqstp, &cstate->current_fh,
 424                                      create->cr_name, create->cr_namelen,
 425                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 426                 break;
 427
 428         default:
 429                 status = nfserr_badtype;
 430         }
 431
 432         if (!status) {
 433                 fh_unlock(&cstate->current_fh);
 434                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
 435                 fh_dup2(&cstate->current_fh, &resfh);
 436         }
 437
 438         fh_put(&resfh);
 439         return status;
 440 }
 441
 442 static __be32
 443 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 444               struct nfsd4_getattr *getattr)
 445 {
 446         __be32 status;
 447
 448         status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
 449         if (status)
 450                 return status;
 451
 452         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 453                 return nfserr_inval;
 454
 455         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 456         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 457
 458         getattr->ga_fhp = &cstate->current_fh;
 459         return nfs_ok;
 460 }
 461
 462 static __be32
 463 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 464            struct nfsd4_link *link)
 465 {
 466         __be32 status = nfserr_nofilehandle;
 467
 468         if (!cstate->save_fh.fh_dentry)
 469                 return status;
 470         status = nfsd_link(rqstp, &cstate->current_fh,
 471                            link->li_name, link->li_namelen, &cstate->save_fh);
 472         if (!status)
 473                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 474         return status;
 475 }
 476
 477 static __be32
 478 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 479               void *arg)
 480 {
 481         struct svc_fh tmp_fh;
 482         __be32 ret;
 483
 484         fh_init(&tmp_fh, NFS4_FHSIZE);
 485         ret = exp_pseudoroot(rqstp, &tmp_fh);
 486         if (ret)
 487                 return ret;
 488         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 489                 fh_put(&tmp_fh);
 490                 return nfserr_noent;
 491         }
 492         fh_put(&tmp_fh);
 493         return nfsd_lookup(rqstp, &cstate->current_fh,
 494                            "..", 2, &cstate->current_fh);
 495 }
 496
 497 static __be32
 498 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499              struct nfsd4_lookup *lookup)
 500 {
 501         return nfsd_lookup(rqstp, &cstate->current_fh,
 502                            lookup->lo_name, lookup->lo_len,
 503                            &cstate->current_fh);
 504 }
 505
 506 static __be32
 507 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 508            struct nfsd4_read *read)
 509 {
 510         __be32 status;
 511
 512         /* no need to check permission - this will be done in nfsd_read() */
 513
 514         read->rd_filp = NULL;
 515         if (read->rd_offset >= OFFSET_MAX)
 516                 return nfserr_inval;
 517
 518         nfs4_lock_state();
 519         /* check stateid */
 520         if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 521                                 &read->rd_stateid,
 522                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 523                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 524                 goto out;
 525         }
 526         if (read->rd_filp)
 527                 get_file(read->rd_filp);
 528         status = nfs_ok;
 529 out:
 530         nfs4_unlock_state();
 531         read->rd_rqstp = rqstp;
 532         read->rd_fhp = &cstate->current_fh;
 533         return status;
 534 }
 535
 536 static __be32
 537 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 538               struct nfsd4_readdir *readdir)
 539 {
 540         u64 cookie = readdir->rd_cookie;
 541         static const nfs4_verifier zeroverf;
 542
 543         /* no need to check permission - this will be done in nfsd_readdir() */
 544
 545         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 546                 return nfserr_inval;
 547
 548         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 549         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 550
 551         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 552             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 553                 return nfserr_bad_cookie;
 554
 555         readdir->rd_rqstp = rqstp;
 556         readdir->rd_fhp = &cstate->current_fh;
 557         return nfs_ok;
 558 }
 559
 560 static __be32
 561 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 562                struct nfsd4_readlink *readlink)
 563 {
 564         readlink->rl_rqstp = rqstp;
 565         readlink->rl_fhp = &cstate->current_fh;
 566         return nfs_ok;
 567 }
 568
 569 static __be32
 570 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 571              struct nfsd4_remove *remove)
 572 {
 573         __be32 status;
 574
 575         if (nfs4_in_grace())
 576                 return nfserr_grace;
 577         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 578                              remove->rm_name, remove->rm_namelen);
 579         if (status == nfserr_symlink)
 580                 return nfserr_notdir;
 581         if (!status) {
 582                 fh_unlock(&cstate->current_fh);
 583                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 584         }
 585         return status;
 586 }
 587
 588 static __be32
 589 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 590              struct nfsd4_rename *rename)
 591 {
 592         __be32 status = nfserr_nofilehandle;
 593
 594         if (!cstate->save_fh.fh_dentry)
 595                 return status;
 596         if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 597                                         & NFSEXP_NOSUBTREECHECK))
 598                 return nfserr_grace;
 599         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 600                              rename->rn_snamelen, &cstate->current_fh,
 601                              rename->rn_tname, rename->rn_tnamelen);
 602
 603         /* the underlying filesystem returns different error's than required
 604          * by NFSv4. both save_fh and current_fh have been verified.. */
 605         if (status == nfserr_isdir)
 606                 status = nfserr_exist;
 607         else if ((status == nfserr_notdir) &&
 608                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 609                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 610                 status = nfserr_exist;
 611         else if (status == nfserr_symlink)
 612                 status = nfserr_notdir;
 613
 614         if (!status) {
 615                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 616                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 617         }
 618         return status;
 619 }
 620
 621 static __be32
 622 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 623               struct nfsd4_secinfo *secinfo)
 624 {
 625         struct svc_fh resfh;
 626         struct svc_export *exp;
 627         struct dentry *dentry;
 628         __be32 err;
 629
 630         fh_init(&resfh, NFS4_FHSIZE);
 631         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 632                                     secinfo->si_name, secinfo->si_namelen,
 633                                     &exp, &dentry);
 634         if (err)
 635                 return err;
 636         if (dentry->d_inode == NULL) {
 637                 exp_put(exp);
 638                 err = nfserr_noent;
 639         } else
 640                 secinfo->si_exp = exp;
 641         dput(dentry);
 642         return err;
 643 }
 644
 645 static __be32
 646 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 647               struct nfsd4_setattr *setattr)
 648 {
 649         __be32 status = nfs_ok;
 650
 651         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 652                 nfs4_lock_state();
 653                 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 654                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 655                 nfs4_unlock_state();
 656                 if (status) {
 657                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 658                         return status;
 659                 }
 660         }
 661         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 662         if (status)
 663                 return status;
 664         status = nfs_ok;
 665         if (setattr->sa_acl != NULL)
 666                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 667                                             setattr->sa_acl);
 668         if (status)
 669                 goto out;
 670         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 671                                 0, (time_t)0);
 672 out:
 673         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 674         return status;
 675 }
 676
 677 static __be32
 678 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 679             struct nfsd4_write *write)
 680 {
 681         stateid_t *stateid = &write->wr_stateid;
 682         struct file *filp = NULL;
 683         u32 *p;
 684         __be32 status = nfs_ok;
 685
 686         /* no need to check permission - this will be done in nfsd_write() */
 687
 688         if (write->wr_offset >= OFFSET_MAX)
 689                 return nfserr_inval;
 690
 691         nfs4_lock_state();
 692         status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
 693                                         CHECK_FH | WR_STATE, &filp);
 694         if (filp)
 695                 get_file(filp);
 696         nfs4_unlock_state();
 697
 698         if (status) {
 699                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 700                 return status;
 701         }
 702
 703         write->wr_bytes_written = write->wr_buflen;
 704         write->wr_how_written = write->wr_stable_how;
 705         p = (u32 *)write->wr_verifier.data;
 706         *p++ = nfssvc_boot.tv_sec;
 707         *p++ = nfssvc_boot.tv_usec;
 708
 709         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 710                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 711                              write->wr_buflen, &write->wr_how_written);
 712         if (filp)
 713                 fput(filp);
 714
 715         if (status == nfserr_symlink)
 716                 status = nfserr_inval;
 717         return status;
 718 }
 719
 720 /* This routine never returns NFS_OK!  If there are no other errors, it
 721  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 722  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 723  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 724  */
 725 static __be32
 726 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 727              struct nfsd4_verify *verify)
 728 {
 729         __be32 *buf, *p;
 730         int count;
 731         __be32 status;
 732
 733         status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
 734         if (status)
 735                 return status;
 736
 737         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 738             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 739                 return nfserr_attrnotsupp;
 740         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 741             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 742                 return nfserr_inval;
 743         if (verify->ve_attrlen & 3)
 744                 return nfserr_inval;
 745
 746         /* count in words:
 747          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 748          */
 749         count = 4 + (verify->ve_attrlen >> 2);
 750         buf = kmalloc(count << 2, GFP_KERNEL);
 751         if (!buf)
 752                 return nfserr_resource;
 753
 754         status = nfsd4_encode_fattr(&cstate->current_fh,
 755                                     cstate->current_fh.fh_export,
 756                                     cstate->current_fh.fh_dentry, buf,
 757                                     &count, verify->ve_bmval,
 758                                     rqstp, 0);
 759
 760         /* this means that nfsd4_encode_fattr() ran out of space */
 761         if (status == nfserr_resource && count == 0)
 762                 status = nfserr_not_same;
 763         if (status)
 764                 goto out_kfree;
 765
 766         p = buf + 3;
 767         status = nfserr_not_same;
 768         if (ntohl(*p++) != verify->ve_attrlen)
 769                 goto out_kfree;
 770         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 771                 status = nfserr_same;
 772
 773 out_kfree:
 774         kfree(buf);
 775         return status;
 776 }
 777
 778 static __be32
 779 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 780               struct nfsd4_verify *verify)
 781 {
 782         __be32 status;
 783
 784         status = _nfsd4_verify(rqstp, cstate, verify);
 785         return status == nfserr_not_same ? nfs_ok : status;
 786 }
 787
 788 static __be32
 789 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 790              struct nfsd4_verify *verify)
 791 {
 792         __be32 status;
 793
 794         status = _nfsd4_verify(rqstp, cstate, verify);
 795         return status == nfserr_same ? nfs_ok : status;
 796 }
 797
 798 /*
 799  * NULL call.
 800  */
 801 static __be32
 802 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 803 {
 804         return nfs_ok;
 805 }
 806
 807 static inline void nfsd4_increment_op_stats(u32 opnum)
 808 {
 809         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 810                 nfsdstats.nfs4_opcount[opnum]++;
 811 }
 812
 813 static void cstate_free(struct nfsd4_compound_state *cstate)
 814 {
 815         if (cstate == NULL)
 816                 return;
 817         fh_put(&cstate->current_fh);
 818         fh_put(&cstate->save_fh);
 819         BUG_ON(cstate->replay_owner);
 820         kfree(cstate);
 821 }
 822
 823 static struct nfsd4_compound_state *cstate_alloc(void)
 824 {
 825         struct nfsd4_compound_state *cstate;
 826
 827         cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
 828         if (cstate == NULL)
 829                 return NULL;
 830         fh_init(&cstate->current_fh, NFS4_FHSIZE);
 831         fh_init(&cstate->save_fh, NFS4_FHSIZE);
 832         cstate->replay_owner = NULL;
 833         return cstate;
 834 }
 835
 836 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 837                               void *);
 838
 839 struct nfsd4_operation {
 840         nfsd4op_func op_func;
 841         u32 op_flags;
 842 /* Most ops require a valid current filehandle; a few don't: */
 843 #define ALLOWED_WITHOUT_FH 1
 844 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
 845 #define ALLOWED_ON_ABSENT_FS 2
 846 };
 847
 848 static struct nfsd4_operation nfsd4_ops[];
 849
 850 /*
 851  * COMPOUND call.
 852  */
 853 static __be32
 854 nfsd4_proc_compound(struct svc_rqst *rqstp,
 855                     struct nfsd4_compoundargs *args,
 856                     struct nfsd4_compoundres *resp)
 857 {
 858         struct nfsd4_op *op;
 859         struct nfsd4_operation *opdesc;
 860         struct nfsd4_compound_state *cstate = NULL;
 861         int             slack_bytes;
 862         __be32          status;
 863
 864         status = nfserr_resource;
 865         cstate = cstate_alloc();
 866         if (cstate == NULL)
 867                 goto out;
 868
 869         resp->xbuf = &rqstp->rq_res;
 870         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 871         resp->tagp = resp->p;
 872         /* reserve space for: taglen, tag, and opcnt */
 873         resp->p += 2 + XDR_QUADLEN(args->taglen);
 874         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 875         resp->taglen = args->taglen;
 876         resp->tag = args->tag;
 877         resp->opcnt = 0;
 878         resp->rqstp = rqstp;
 879
 880         /*
 881          * According to RFC3010, this takes precedence over all other errors.
 882          */
 883         status = nfserr_minor_vers_mismatch;
 884         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 885                 goto out;
 886
 887         status = nfs_ok;
 888         while (!status && resp->opcnt < args->opcnt) {
 889                 op = &args->ops[resp->opcnt++];
 890
 891                 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
 892
 893                 /*
 894                  * The XDR decode routines may have pre-set op->status;
 895                  * for example, if there is a miscellaneous XDR error
 896                  * it will be set to nfserr_bad_xdr.
 897                  */
 898                 if (op->status)
 899                         goto encode_op;
 900
 901                 /* We must be able to encode a successful response to
 902                  * this operation, with enough room left over to encode a
 903                  * failed response to the next operation.  If we don't
 904                  * have enough room, fail with ERR_RESOURCE.
 905                  */
 906                 slack_bytes = (char *)resp->end - (char *)resp->p;
 907                 if (slack_bytes < COMPOUND_SLACK_SPACE
 908                                 + COMPOUND_ERR_SLACK_SPACE) {
 909                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 910                         op->status = nfserr_resource;
 911                         goto encode_op;
 912                 }
 913
 914                 opdesc = &nfsd4_ops[op->opnum];
 915
 916                 if (!cstate->current_fh.fh_dentry) {
 917                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 918                                 op->status = nfserr_nofilehandle;
 919                                 goto encode_op;
 920                         }
 921                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 922                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 923                         op->status = nfserr_moved;
 924                         goto encode_op;
 925                 }
 926
 927                 if (opdesc->op_func)
 928                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 929                 else
 930                         BUG_ON(op->status == nfs_ok);
 931
 932 encode_op:
 933                 if (op->status == nfserr_replay_me) {
 934                         op->replay = &cstate->replay_owner->so_replay;
 935                         nfsd4_encode_replay(resp, op);
 936                         status = op->status = op->replay->rp_status;
 937                 } else {
 938                         nfsd4_encode_operation(resp, op);
 939                         status = op->status;
 940                 }
 941                 if (cstate->replay_owner) {
 942                         nfs4_put_stateowner(cstate->replay_owner);
 943                         cstate->replay_owner = NULL;
 944                 }
 945                 /* XXX Ugh, we need to get rid of this kind of special case: */
 946                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 947                         fput(op->u.read.rd_filp);
 948
 949                 nfsd4_increment_op_stats(op->opnum);
 950         }
 951
 952 out:
 953         nfsd4_release_compoundargs(args);
 954         cstate_free(cstate);
 955         dprintk("nfsv4 compound returned %d\n", ntohl(status));
 956         return status;
 957 }
 958
 959 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 960         [OP_ACCESS] = {
 961                 .op_func = (nfsd4op_func)nfsd4_access,
 962         },
 963         [OP_CLOSE] = {
 964                 .op_func = (nfsd4op_func)nfsd4_close,
 965         },
 966         [OP_COMMIT] = {
 967                 .op_func = (nfsd4op_func)nfsd4_commit,
 968         },
 969         [OP_CREATE] = {
 970                 .op_func = (nfsd4op_func)nfsd4_create,
 971         },
 972         [OP_DELEGRETURN] = {
 973                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
 974         },
 975         [OP_GETATTR] = {
 976                 .op_func = (nfsd4op_func)nfsd4_getattr,
 977                 .op_flags = ALLOWED_ON_ABSENT_FS,
 978         },
 979         [OP_GETFH] = {
 980                 .op_func = (nfsd4op_func)nfsd4_getfh,
 981         },
 982         [OP_LINK] = {
 983                 .op_func = (nfsd4op_func)nfsd4_link,
 984         },
 985         [OP_LOCK] = {
 986                 .op_func = (nfsd4op_func)nfsd4_lock,
 987         },
 988         [OP_LOCKT] = {
 989                 .op_func = (nfsd4op_func)nfsd4_lockt,
 990         },
 991         [OP_LOCKU] = {
 992                 .op_func = (nfsd4op_func)nfsd4_locku,
 993         },
 994         [OP_LOOKUP] = {
 995                 .op_func = (nfsd4op_func)nfsd4_lookup,
 996         },
 997         [OP_LOOKUPP] = {
 998                 .op_func = (nfsd4op_func)nfsd4_lookupp,
 999         },
1000         [OP_NVERIFY] = {
1001                 .op_func = (nfsd4op_func)nfsd4_nverify,
1002         },
1003         [OP_OPEN] = {
1004                 .op_func = (nfsd4op_func)nfsd4_open,
1005         },
1006         [OP_OPEN_CONFIRM] = {
1007                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1008         },
1009         [OP_OPEN_DOWNGRADE] = {
1010                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1011         },
1012         [OP_PUTFH] = {
1013                 .op_func = (nfsd4op_func)nfsd4_putfh,
1014                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1015         },
1016         [OP_PUTPUBFH] = {
1017                 /* unsupported; just for future reference: */
1018                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1019         },
1020         [OP_PUTROOTFH] = {
1021                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1022                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1023         },
1024         [OP_READ] = {
1025                 .op_func = (nfsd4op_func)nfsd4_read,
1026         },
1027         [OP_READDIR] = {
1028                 .op_func = (nfsd4op_func)nfsd4_readdir,
1029         },
1030         [OP_READLINK] = {
1031                 .op_func = (nfsd4op_func)nfsd4_readlink,
1032         },
1033         [OP_REMOVE] = {
1034                 .op_func = (nfsd4op_func)nfsd4_remove,
1035         },
1036         [OP_RENAME] = {
1037                 .op_func = (nfsd4op_func)nfsd4_rename,
1038         },
1039         [OP_RENEW] = {
1040                 .op_func = (nfsd4op_func)nfsd4_renew,
1041                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1042         },
1043         [OP_RESTOREFH] = {
1044                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1045                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1046         },
1047         [OP_SAVEFH] = {
1048                 .op_func = (nfsd4op_func)nfsd4_savefh,
1049         },
1050         [OP_SECINFO] = {
1051                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1052         },
1053         [OP_SETATTR] = {
1054                 .op_func = (nfsd4op_func)nfsd4_setattr,
1055         },
1056         [OP_SETCLIENTID] = {
1057                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1058                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1059         },
1060         [OP_SETCLIENTID_CONFIRM] = {
1061                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1062                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1063         },
1064         [OP_VERIFY] = {
1065                 .op_func = (nfsd4op_func)nfsd4_verify,
1066         },
1067         [OP_WRITE] = {
1068                 .op_func = (nfsd4op_func)nfsd4_write,
1069         },
1070         [OP_RELEASE_LOCKOWNER] = {
1071                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1072                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1073         },
1074 };
1075
1076 #define nfs4svc_decode_voidargs         NULL
1077 #define nfs4svc_release_void            NULL
1078 #define nfsd4_voidres                   nfsd4_voidargs
1079 #define nfs4svc_release_compound        NULL
1080 struct nfsd4_voidargs { int dummy; };
1081
1082 #define PROC(name, argt, rest, relt, cache, respsize)   \
1083  { (svc_procfunc) nfsd4_proc_##name,            \
1084    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1085    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1086    (kxdrproc_t) nfs4svc_release_##relt,         \
1087    sizeof(struct nfsd4_##argt##args),           \
1088    sizeof(struct nfsd4_##rest##res),            \
1089    0,                                           \
1090    cache,                                       \
1091    respsize,                                    \
1092  }
1093
1094 /*
1095  * TODO: At the present time, the NFSv4 server does not do XID caching
1096  * of requests.  Implementing XID caching would not be a serious problem,
1097  * although it would require a mild change in interfaces since one
1098  * doesn't know whether an NFSv4 request is idempotent until after the
1099  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1100  * Astrand's regression testsuite for NFSv4 servers), which reuses
1101  * XID's liberally, so I've left it unimplemented until pynfs generates
1102  * better XID's.
1103  */
1104 static struct svc_procedure             nfsd_procedures4[2] = {
1105   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1106   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1107 };
1108
1109 struct svc_version      nfsd_version4 = {
1110                 .vs_vers        = 4,
1111                 .vs_nproc       = 2,
1112                 .vs_proc        = nfsd_procedures4,
1113                 .vs_dispatch    = nfsd_dispatch,
1114                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1115 };
1116
1117 /*
1118  * Local variables:
1119  *  c-basic-offset: 8
1120  * End:
1121  */