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