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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 svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 262             struct svc_fh **getfh)
 263 {
 264         if (!cstate->current_fh.fh_dentry)
 265                 return nfserr_nofilehandle;
 266
 267         *getfh = &cstate->current_fh;
 268         return nfs_ok;
 269 }
 270
 271 static __be32
 272 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 273             struct nfsd4_putfh *putfh)
 274 {
 275         fh_put(&cstate->current_fh);
 276         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 277         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 278                putfh->pf_fhlen);
 279         return fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
 280 }
 281
 282 static __be32
 283 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 284                 void *arg)
 285 {
 286         __be32 status;
 287
 288         fh_put(&cstate->current_fh);
 289         status = exp_pseudoroot(rqstp->rq_client, &cstate->current_fh,
 290                               &rqstp->rq_chandle);
 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         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 478                               &rqstp->rq_chandle)) != 0)
 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_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 615               struct nfsd4_setattr *setattr)
 616 {
 617         __be32 status = nfs_ok;
 618
 619         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 620                 nfs4_lock_state();
 621                 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 622                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 623                 nfs4_unlock_state();
 624                 if (status) {
 625                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 626                         return status;
 627                 }
 628         }
 629         status = nfs_ok;
 630         if (setattr->sa_acl != NULL)
 631                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 632                                             setattr->sa_acl);
 633         if (status)
 634                 return status;
 635         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 636                                 0, (time_t)0);
 637         return status;
 638 }
 639
 640 static __be32
 641 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 642             struct nfsd4_write *write)
 643 {
 644         stateid_t *stateid = &write->wr_stateid;
 645         struct file *filp = NULL;
 646         u32 *p;
 647         __be32 status = nfs_ok;
 648
 649         /* no need to check permission - this will be done in nfsd_write() */
 650
 651         if (write->wr_offset >= OFFSET_MAX)
 652                 return nfserr_inval;
 653
 654         nfs4_lock_state();
 655         status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
 656                                         CHECK_FH | WR_STATE, &filp);
 657         if (filp)
 658                 get_file(filp);
 659         nfs4_unlock_state();
 660
 661         if (status) {
 662                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 663                 return status;
 664         }
 665
 666         write->wr_bytes_written = write->wr_buflen;
 667         write->wr_how_written = write->wr_stable_how;
 668         p = (u32 *)write->wr_verifier.data;
 669         *p++ = nfssvc_boot.tv_sec;
 670         *p++ = nfssvc_boot.tv_usec;
 671
 672         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 673                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 674                              write->wr_buflen, &write->wr_how_written);
 675         if (filp)
 676                 fput(filp);
 677
 678         if (status == nfserr_symlink)
 679                 status = nfserr_inval;
 680         return status;
 681 }
 682
 683 /* This routine never returns NFS_OK!  If there are no other errors, it
 684  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 685  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 686  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 687  */
 688 static __be32
 689 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 690              struct nfsd4_verify *verify)
 691 {
 692         __be32 *buf, *p;
 693         int count;
 694         __be32 status;
 695
 696         status = fh_verify(rqstp, &cstate->current_fh, 0, MAY_NOP);
 697         if (status)
 698                 return status;
 699
 700         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 701             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 702                 return nfserr_attrnotsupp;
 703         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 704             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 705                 return nfserr_inval;
 706         if (verify->ve_attrlen & 3)
 707                 return nfserr_inval;
 708
 709         /* count in words:
 710          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 711          */
 712         count = 4 + (verify->ve_attrlen >> 2);
 713         buf = kmalloc(count << 2, GFP_KERNEL);
 714         if (!buf)
 715                 return nfserr_resource;
 716
 717         status = nfsd4_encode_fattr(&cstate->current_fh,
 718                                     cstate->current_fh.fh_export,
 719                                     cstate->current_fh.fh_dentry, buf,
 720                                     &count, verify->ve_bmval,
 721                                     rqstp);
 722
 723         /* this means that nfsd4_encode_fattr() ran out of space */
 724         if (status == nfserr_resource && count == 0)
 725                 status = nfserr_not_same;
 726         if (status)
 727                 goto out_kfree;
 728
 729         p = buf + 3;
 730         status = nfserr_not_same;
 731         if (ntohl(*p++) != verify->ve_attrlen)
 732                 goto out_kfree;
 733         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 734                 status = nfserr_same;
 735
 736 out_kfree:
 737         kfree(buf);
 738         return status;
 739 }
 740
 741 static __be32
 742 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 743               struct nfsd4_verify *verify)
 744 {
 745         __be32 status;
 746
 747         status = _nfsd4_verify(rqstp, cstate, verify);
 748         return status == nfserr_not_same ? nfs_ok : status;
 749 }
 750
 751 static __be32
 752 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 753              struct nfsd4_verify *verify)
 754 {
 755         __be32 status;
 756
 757         status = _nfsd4_verify(rqstp, cstate, verify);
 758         return status == nfserr_same ? nfs_ok : status;
 759 }
 760
 761 /*
 762  * NULL call.
 763  */
 764 static __be32
 765 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 766 {
 767         return nfs_ok;
 768 }
 769
 770 static inline void nfsd4_increment_op_stats(u32 opnum)
 771 {
 772         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 773                 nfsdstats.nfs4_opcount[opnum]++;
 774 }
 775
 776 static void cstate_free(struct nfsd4_compound_state *cstate)
 777 {
 778         if (cstate == NULL)
 779                 return;
 780         fh_put(&cstate->current_fh);
 781         fh_put(&cstate->save_fh);
 782         BUG_ON(cstate->replay_owner);
 783         kfree(cstate);
 784 }
 785
 786 static struct nfsd4_compound_state *cstate_alloc(void)
 787 {
 788         struct nfsd4_compound_state *cstate;
 789
 790         cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
 791         if (cstate == NULL)
 792                 return NULL;
 793         fh_init(&cstate->current_fh, NFS4_FHSIZE);
 794         fh_init(&cstate->save_fh, NFS4_FHSIZE);
 795         cstate->replay_owner = NULL;
 796         return cstate;
 797 }
 798
 799 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 800                               void *);
 801
 802 struct nfsd4_operation {
 803         nfsd4op_func op_func;
 804         u32 op_flags;
 805 /* Most ops require a valid current filehandle; a few don't: */
 806 #define ALLOWED_WITHOUT_FH 1
 807 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
 808 #define ALLOWED_ON_ABSENT_FS 2
 809 };
 810
 811 static struct nfsd4_operation nfsd4_ops[];
 812
 813 /*
 814  * COMPOUND call.
 815  */
 816 static __be32
 817 nfsd4_proc_compound(struct svc_rqst *rqstp,
 818                     struct nfsd4_compoundargs *args,
 819                     struct nfsd4_compoundres *resp)
 820 {
 821         struct nfsd4_op *op;
 822         struct nfsd4_operation *opdesc;
 823         struct nfsd4_compound_state *cstate = NULL;
 824         int             slack_bytes;
 825         __be32          status;
 826
 827         status = nfserr_resource;
 828         cstate = cstate_alloc();
 829         if (cstate == NULL)
 830                 goto out;
 831
 832         resp->xbuf = &rqstp->rq_res;
 833         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 834         resp->tagp = resp->p;
 835         /* reserve space for: taglen, tag, and opcnt */
 836         resp->p += 2 + XDR_QUADLEN(args->taglen);
 837         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 838         resp->taglen = args->taglen;
 839         resp->tag = args->tag;
 840         resp->opcnt = 0;
 841         resp->rqstp = rqstp;
 842
 843         /*
 844          * According to RFC3010, this takes precedence over all other errors.
 845          */
 846         status = nfserr_minor_vers_mismatch;
 847         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 848                 goto out;
 849
 850         status = nfs_ok;
 851         while (!status && resp->opcnt < args->opcnt) {
 852                 op = &args->ops[resp->opcnt++];
 853
 854                 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
 855
 856                 /*
 857                  * The XDR decode routines may have pre-set op->status;
 858                  * for example, if there is a miscellaneous XDR error
 859                  * it will be set to nfserr_bad_xdr.
 860                  */
 861                 if (op->status)
 862                         goto encode_op;
 863
 864                 /* We must be able to encode a successful response to
 865                  * this operation, with enough room left over to encode a
 866                  * failed response to the next operation.  If we don't
 867                  * have enough room, fail with ERR_RESOURCE.
 868                  */
 869                 slack_bytes = (char *)resp->end - (char *)resp->p;
 870                 if (slack_bytes < COMPOUND_SLACK_SPACE
 871                                 + COMPOUND_ERR_SLACK_SPACE) {
 872                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 873                         op->status = nfserr_resource;
 874                         goto encode_op;
 875                 }
 876
 877                 opdesc = &nfsd4_ops[op->opnum];
 878
 879                 if (!cstate->current_fh.fh_dentry) {
 880                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 881                                 op->status = nfserr_nofilehandle;
 882                                 goto encode_op;
 883                         }
 884                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 885                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 886                         op->status = nfserr_moved;
 887                         goto encode_op;
 888                 }
 889
 890                 if (opdesc->op_func)
 891                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 892                 else
 893                         BUG_ON(op->status == nfs_ok);
 894
 895 encode_op:
 896                 if (op->status == nfserr_replay_me) {
 897                         op->replay = &cstate->replay_owner->so_replay;
 898                         nfsd4_encode_replay(resp, op);
 899                         status = op->status = op->replay->rp_status;
 900                 } else {
 901                         nfsd4_encode_operation(resp, op);
 902                         status = op->status;
 903                 }
 904                 if (cstate->replay_owner) {
 905                         nfs4_put_stateowner(cstate->replay_owner);
 906                         cstate->replay_owner = NULL;
 907                 }
 908                 /* XXX Ugh, we need to get rid of this kind of special case: */
 909                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 910                         fput(op->u.read.rd_filp);
 911
 912                 nfsd4_increment_op_stats(op->opnum);
 913         }
 914
 915 out:
 916         nfsd4_release_compoundargs(args);
 917         cstate_free(cstate);
 918         return status;
 919 }
 920
 921 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 922         [OP_ACCESS] = {
 923                 .op_func = (nfsd4op_func)nfsd4_access,
 924         },
 925         [OP_CLOSE] = {
 926                 .op_func = (nfsd4op_func)nfsd4_close,
 927         },
 928         [OP_COMMIT] = {
 929                 .op_func = (nfsd4op_func)nfsd4_commit,
 930         },
 931         [OP_CREATE] = {
 932                 .op_func = (nfsd4op_func)nfsd4_create,
 933         },
 934         [OP_DELEGRETURN] = {
 935                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
 936         },
 937         [OP_GETATTR] = {
 938                 .op_func = (nfsd4op_func)nfsd4_getattr,
 939                 .op_flags = ALLOWED_ON_ABSENT_FS,
 940         },
 941         [OP_GETFH] = {
 942                 .op_func = (nfsd4op_func)nfsd4_getfh,
 943         },
 944         [OP_LINK] = {
 945                 .op_func = (nfsd4op_func)nfsd4_link,
 946         },
 947         [OP_LOCK] = {
 948                 .op_func = (nfsd4op_func)nfsd4_lock,
 949         },
 950         [OP_LOCKT] = {
 951                 .op_func = (nfsd4op_func)nfsd4_lockt,
 952         },
 953         [OP_LOCKU] = {
 954                 .op_func = (nfsd4op_func)nfsd4_locku,
 955         },
 956         [OP_LOOKUP] = {
 957                 .op_func = (nfsd4op_func)nfsd4_lookup,
 958         },
 959         [OP_LOOKUPP] = {
 960                 .op_func = (nfsd4op_func)nfsd4_lookupp,
 961         },
 962         [OP_NVERIFY] = {
 963                 .op_func = (nfsd4op_func)nfsd4_nverify,
 964         },
 965         [OP_OPEN] = {
 966                 .op_func = (nfsd4op_func)nfsd4_open,
 967         },
 968         [OP_OPEN_CONFIRM] = {
 969                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
 970         },
 971         [OP_OPEN_DOWNGRADE] = {
 972                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
 973         },
 974         [OP_PUTFH] = {
 975                 .op_func = (nfsd4op_func)nfsd4_putfh,
 976                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 977         },
 978         [OP_PUTPUBFH] = {
 979                 /* unsupported; just for future reference: */
 980                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 981         },
 982         [OP_PUTROOTFH] = {
 983                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
 984                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
 985         },
 986         [OP_READ] = {
 987                 .op_func = (nfsd4op_func)nfsd4_read,
 988         },
 989         [OP_READDIR] = {
 990                 .op_func = (nfsd4op_func)nfsd4_readdir,
 991         },
 992         [OP_READLINK] = {
 993                 .op_func = (nfsd4op_func)nfsd4_readlink,
 994         },
 995         [OP_REMOVE] = {
 996                 .op_func = (nfsd4op_func)nfsd4_remove,
 997         },
 998         [OP_RENAME] = {
 999                 .op_func = (nfsd4op_func)nfsd4_rename,
1000         },
1001         [OP_RENEW] = {
1002                 .op_func = (nfsd4op_func)nfsd4_renew,
1003                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1004         },
1005         [OP_RESTOREFH] = {
1006                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1007                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1008         },
1009         [OP_SAVEFH] = {
1010                 .op_func = (nfsd4op_func)nfsd4_savefh,
1011         },
1012         [OP_SETATTR] = {
1013                 .op_func = (nfsd4op_func)nfsd4_setattr,
1014         },
1015         [OP_SETCLIENTID] = {
1016                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1017                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1018         },
1019         [OP_SETCLIENTID_CONFIRM] = {
1020                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1021                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1022         },
1023         [OP_VERIFY] = {
1024                 .op_func = (nfsd4op_func)nfsd4_verify,
1025         },
1026         [OP_WRITE] = {
1027                 .op_func = (nfsd4op_func)nfsd4_write,
1028         },
1029         [OP_RELEASE_LOCKOWNER] = {
1030                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1031                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1032         },
1033 };
1034
1035 #define nfs4svc_decode_voidargs         NULL
1036 #define nfs4svc_release_void            NULL
1037 #define nfsd4_voidres                   nfsd4_voidargs
1038 #define nfs4svc_release_compound        NULL
1039 struct nfsd4_voidargs { int dummy; };
1040
1041 #define PROC(name, argt, rest, relt, cache, respsize)   \
1042  { (svc_procfunc) nfsd4_proc_##name,            \
1043    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1044    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1045    (kxdrproc_t) nfs4svc_release_##relt,         \
1046    sizeof(struct nfsd4_##argt##args),           \
1047    sizeof(struct nfsd4_##rest##res),            \
1048    0,                                           \
1049    cache,                                       \
1050    respsize,                                    \
1051  }
1052
1053 /*
1054  * TODO: At the present time, the NFSv4 server does not do XID caching
1055  * of requests.  Implementing XID caching would not be a serious problem,
1056  * although it would require a mild change in interfaces since one
1057  * doesn't know whether an NFSv4 request is idempotent until after the
1058  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1059  * Astrand's regression testsuite for NFSv4 servers), which reuses
1060  * XID's liberally, so I've left it unimplemented until pynfs generates
1061  * better XID's.
1062  */
1063 static struct svc_procedure             nfsd_procedures4[2] = {
1064   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1065   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1066 };
1067
1068 struct svc_version      nfsd_version4 = {
1069                 .vs_vers        = 4,
1070                 .vs_nproc       = 2,
1071                 .vs_proc        = nfsd_procedures4,
1072                 .vs_dispatch    = nfsd_dispatch,
1073                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1074 };
1075
1076 /*
1077  * Local variables:
1078  *  c-basic-offset: 8
1079  * End:
1080  */