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