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 |= NFSD_MAY_READ;
  75         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
  76                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
  77         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
  78                 accmode |= NFSD_MAY_WRITE;
  79
  80         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  81
  82         return status;
  83 }
  84
  85 static __be32
  86 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  87 {
  88         struct svc_fh resfh;
  89         __be32 status;
  90         int created = 0;
  91
  92         fh_init(&resfh, NFS4_FHSIZE);
  93         open->op_truncate = 0;
  94
  95         if (open->op_create) {
  96                 /*
  97                  * Note: create modes (UNCHECKED,GUARDED...) are the same
  98                  * in NFSv4 as in v3.
  99                  */
 100                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 101                                         open->op_fname.len, &open->op_iattr,
 102                                         &resfh, open->op_createmode,
 103                                         (u32 *)open->op_verf.data,
 104                                         &open->op_truncate, &created);
 105
 106                 /* If we ever decide to use different attrs to store the
 107                  * verifier in nfsd_create_v3, then we'll need to change this
 108                  */
 109                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 110                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 111                                                 FATTR4_WORD1_TIME_MODIFY);
 112         } else {
 113                 status = nfsd_lookup(rqstp, current_fh,
 114                                      open->op_fname.data, open->op_fname.len, &resfh);
 115                 fh_unlock(current_fh);
 116         }
 117         if (status)
 118                 goto out;
 119
 120         set_change_info(&open->op_cinfo, current_fh);
 121
 122         /* set reply cache */
 123         fh_dup2(current_fh, &resfh);
 124         open->op_stateowner->so_replay.rp_openfh_len = resfh.fh_handle.fh_size;
 125         memcpy(open->op_stateowner->so_replay.rp_openfh,
 126                         &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
 127
 128         if (!created)
 129                 status = do_open_permission(rqstp, current_fh, open,
 130                                             NFSD_MAY_NOP);
 131
 132 out:
 133         fh_put(&resfh);
 134         return status;
 135 }
 136
 137 static __be32
 138 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 139 {
 140         __be32 status;
 141
 142         /* Only reclaims from previously confirmed clients are valid */
 143         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 144                 return status;
 145
 146         /* We don't know the target directory, and therefore can not
 147         * set the change info
 148         */
 149
 150         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 151
 152         /* set replay cache */
 153         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 154         memcpy(open->op_stateowner->so_replay.rp_openfh,
 155                 &current_fh->fh_handle.fh_base,
 156                 current_fh->fh_handle.fh_size);
 157
 158         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 159                 (open->op_iattr.ia_size == 0);
 160
 161         status = do_open_permission(rqstp, current_fh, open,
 162                                     NFSD_MAY_OWNER_OVERRIDE);
 163
 164         return status;
 165 }
 166
 167
 168 static __be32
 169 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 170            struct nfsd4_open *open)
 171 {
 172         __be32 status;
 173         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 174                 (int)open->op_fname.len, open->op_fname.data,
 175                 open->op_stateowner);
 176
 177         /* This check required by spec. */
 178         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 179                 return nfserr_inval;
 180
 181         nfs4_lock_state();
 182
 183         /* check seqid for replay. set nfs4_owner */
 184         status = nfsd4_process_open1(open);
 185         if (status == nfserr_replay_me) {
 186                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 187                 fh_put(&cstate->current_fh);
 188                 cstate->current_fh.fh_handle.fh_size = rp->rp_openfh_len;
 189                 memcpy(&cstate->current_fh.fh_handle.fh_base, rp->rp_openfh,
 190                                 rp->rp_openfh_len);
 191                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 192                 if (status)
 193                         dprintk("nfsd4_open: replay failed"
 194                                 " restoring previous filehandle\n");
 195                 else
 196                         status = nfserr_replay_me;
 197         }
 198         if (status)
 199                 goto out;
 200
 201         /* Openowner is now set, so sequence id will get bumped.  Now we need
 202          * these checks before we do any creates: */
 203         status = nfserr_grace;
 204         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 205                 goto out;
 206         status = nfserr_no_grace;
 207         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 208                 goto out;
 209
 210         switch (open->op_claim_type) {
 211                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 212                         status = nfserr_inval;
 213                         if (open->op_create)
 214                                 goto out;
 215                         /* fall through */
 216                 case NFS4_OPEN_CLAIM_NULL:
 217                         /*
 218                          * (1) set CURRENT_FH to the file being opened,
 219                          * creating it if necessary, (2) set open->op_cinfo,
 220                          * (3) set open->op_truncate if the file is to be
 221                          * truncated after opening, (4) do permission checking.
 222                          */
 223                         status = do_open_lookup(rqstp, &cstate->current_fh,
 224                                                 open);
 225                         if (status)
 226                                 goto out;
 227                         break;
 228                 case NFS4_OPEN_CLAIM_PREVIOUS:
 229                         open->op_stateowner->so_confirmed = 1;
 230                         /*
 231                          * The CURRENT_FH is already set to the file being
 232                          * opened.  (1) set open->op_cinfo, (2) set
 233                          * open->op_truncate if the file is to be truncated
 234                          * after opening, (3) do permission checking.
 235                         */
 236                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 237                                                  open);
 238                         if (status)
 239                                 goto out;
 240                         break;
 241                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 242                         open->op_stateowner->so_confirmed = 1;
 243                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 244                                 open->op_claim_type);
 245                         status = nfserr_notsupp;
 246                         goto out;
 247                 default:
 248                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 249                                 open->op_claim_type);
 250                         status = nfserr_inval;
 251                         goto out;
 252         }
 253         /*
 254          * nfsd4_process_open2() does the actual opening of the file.  If
 255          * successful, it (1) truncates the file if open->op_truncate was
 256          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 257          */
 258         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 259 out:
 260         if (open->op_stateowner) {
 261                 nfs4_get_stateowner(open->op_stateowner);
 262                 cstate->replay_owner = open->op_stateowner;
 263         }
 264         nfs4_unlock_state();
 265         return status;
 266 }
 267
 268 /*
 269  * filehandle-manipulating ops.
 270  */
 271 static __be32
 272 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 273             struct svc_fh **getfh)
 274 {
 275         if (!cstate->current_fh.fh_dentry)
 276                 return nfserr_nofilehandle;
 277
 278         *getfh = &cstate->current_fh;
 279         return nfs_ok;
 280 }
 281
 282 static __be32
 283 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 284             struct nfsd4_putfh *putfh)
 285 {
 286         fh_put(&cstate->current_fh);
 287         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 288         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 289                putfh->pf_fhlen);
 290         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 291 }
 292
 293 static __be32
 294 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 295                 void *arg)
 296 {
 297         __be32 status;
 298
 299         fh_put(&cstate->current_fh);
 300         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 301         return status;
 302 }
 303
 304 static __be32
 305 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 306                 void *arg)
 307 {
 308         if (!cstate->save_fh.fh_dentry)
 309                 return nfserr_restorefh;
 310
 311         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 312         return nfs_ok;
 313 }
 314
 315 static __be32
 316 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 317              void *arg)
 318 {
 319         if (!cstate->current_fh.fh_dentry)
 320                 return nfserr_nofilehandle;
 321
 322         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 323         return nfs_ok;
 324 }
 325
 326 /*
 327  * misc nfsv4 ops
 328  */
 329 static __be32
 330 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 331              struct nfsd4_access *access)
 332 {
 333         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 334                 return nfserr_inval;
 335
 336         access->ac_resp_access = access->ac_req_access;
 337         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 338                            &access->ac_supported);
 339 }
 340
 341 static __be32
 342 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 343              struct nfsd4_commit *commit)
 344 {
 345         __be32 status;
 346
 347         u32 *p = (u32 *)commit->co_verf.data;
 348         *p++ = nfssvc_boot.tv_sec;
 349         *p++ = nfssvc_boot.tv_usec;
 350
 351         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 352                              commit->co_count);
 353         if (status == nfserr_symlink)
 354                 status = nfserr_inval;
 355         return status;
 356 }
 357
 358 static __be32
 359 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 360              struct nfsd4_create *create)
 361 {
 362         struct svc_fh resfh;
 363         __be32 status;
 364         dev_t rdev;
 365
 366         fh_init(&resfh, NFS4_FHSIZE);
 367
 368         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 369                            NFSD_MAY_CREATE);
 370         if (status == nfserr_symlink)
 371                 status = nfserr_notdir;
 372         if (status)
 373                 return status;
 374
 375         switch (create->cr_type) {
 376         case NF4LNK:
 377                 /* ugh! we have to null-terminate the linktext, or
 378                  * vfs_symlink() will choke.  it is always safe to
 379                  * null-terminate by brute force, since at worst we
 380                  * will overwrite the first byte of the create namelen
 381                  * in the XDR buffer, which has already been extracted
 382                  * during XDR decode.
 383                  */
 384                 create->cr_linkname[create->cr_linklen] = 0;
 385
 386                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 387                                       create->cr_name, create->cr_namelen,
 388                                       create->cr_linkname, create->cr_linklen,
 389                                       &resfh, &create->cr_iattr);
 390                 break;
 391
 392         case NF4BLK:
 393                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 394                 if (MAJOR(rdev) != create->cr_specdata1 ||
 395                     MINOR(rdev) != create->cr_specdata2)
 396                         return nfserr_inval;
 397                 status = nfsd_create(rqstp, &cstate->current_fh,
 398                                      create->cr_name, create->cr_namelen,
 399                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 400                 break;
 401
 402         case NF4CHR:
 403                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 404                 if (MAJOR(rdev) != create->cr_specdata1 ||
 405                     MINOR(rdev) != create->cr_specdata2)
 406                         return nfserr_inval;
 407                 status = nfsd_create(rqstp, &cstate->current_fh,
 408                                      create->cr_name, create->cr_namelen,
 409                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 410                 break;
 411
 412         case NF4SOCK:
 413                 status = nfsd_create(rqstp, &cstate->current_fh,
 414                                      create->cr_name, create->cr_namelen,
 415                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 416                 break;
 417
 418         case NF4FIFO:
 419                 status = nfsd_create(rqstp, &cstate->current_fh,
 420                                      create->cr_name, create->cr_namelen,
 421                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 422                 break;
 423
 424         case NF4DIR:
 425                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 426                 status = nfsd_create(rqstp, &cstate->current_fh,
 427                                      create->cr_name, create->cr_namelen,
 428                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 429                 break;
 430
 431         default:
 432                 status = nfserr_badtype;
 433         }
 434
 435         if (!status) {
 436                 fh_unlock(&cstate->current_fh);
 437                 set_change_info(&create->cr_cinfo, &cstate->current_fh);
 438                 fh_dup2(&cstate->current_fh, &resfh);
 439         }
 440
 441         fh_put(&resfh);
 442         return status;
 443 }
 444
 445 static __be32
 446 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 447               struct nfsd4_getattr *getattr)
 448 {
 449         __be32 status;
 450
 451         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 452         if (status)
 453                 return status;
 454
 455         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 456                 return nfserr_inval;
 457
 458         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 459         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 460
 461         getattr->ga_fhp = &cstate->current_fh;
 462         return nfs_ok;
 463 }
 464
 465 static __be32
 466 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 467            struct nfsd4_link *link)
 468 {
 469         __be32 status = nfserr_nofilehandle;
 470
 471         if (!cstate->save_fh.fh_dentry)
 472                 return status;
 473         status = nfsd_link(rqstp, &cstate->current_fh,
 474                            link->li_name, link->li_namelen, &cstate->save_fh);
 475         if (!status)
 476                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 477         return status;
 478 }
 479
 480 static __be32
 481 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 482               void *arg)
 483 {
 484         struct svc_fh tmp_fh;
 485         __be32 ret;
 486
 487         fh_init(&tmp_fh, NFS4_FHSIZE);
 488         ret = exp_pseudoroot(rqstp, &tmp_fh);
 489         if (ret)
 490                 return ret;
 491         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 492                 fh_put(&tmp_fh);
 493                 return nfserr_noent;
 494         }
 495         fh_put(&tmp_fh);
 496         return nfsd_lookup(rqstp, &cstate->current_fh,
 497                            "..", 2, &cstate->current_fh);
 498 }
 499
 500 static __be32
 501 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 502              struct nfsd4_lookup *lookup)
 503 {
 504         return nfsd_lookup(rqstp, &cstate->current_fh,
 505                            lookup->lo_name, lookup->lo_len,
 506                            &cstate->current_fh);
 507 }
 508
 509 static __be32
 510 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 511            struct nfsd4_read *read)
 512 {
 513         __be32 status;
 514
 515         /* no need to check permission - this will be done in nfsd_read() */
 516
 517         read->rd_filp = NULL;
 518         if (read->rd_offset >= OFFSET_MAX)
 519                 return nfserr_inval;
 520
 521         nfs4_lock_state();
 522         /* check stateid */
 523         if ((status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 524                                 &read->rd_stateid,
 525                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 526                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 527                 goto out;
 528         }
 529         if (read->rd_filp)
 530                 get_file(read->rd_filp);
 531         status = nfs_ok;
 532 out:
 533         nfs4_unlock_state();
 534         read->rd_rqstp = rqstp;
 535         read->rd_fhp = &cstate->current_fh;
 536         return status;
 537 }
 538
 539 static __be32
 540 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 541               struct nfsd4_readdir *readdir)
 542 {
 543         u64 cookie = readdir->rd_cookie;
 544         static const nfs4_verifier zeroverf;
 545
 546         /* no need to check permission - this will be done in nfsd_readdir() */
 547
 548         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 549                 return nfserr_inval;
 550
 551         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 552         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 553
 554         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 555             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 556                 return nfserr_bad_cookie;
 557
 558         readdir->rd_rqstp = rqstp;
 559         readdir->rd_fhp = &cstate->current_fh;
 560         return nfs_ok;
 561 }
 562
 563 static __be32
 564 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 565                struct nfsd4_readlink *readlink)
 566 {
 567         readlink->rl_rqstp = rqstp;
 568         readlink->rl_fhp = &cstate->current_fh;
 569         return nfs_ok;
 570 }
 571
 572 static __be32
 573 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 574              struct nfsd4_remove *remove)
 575 {
 576         __be32 status;
 577
 578         if (nfs4_in_grace())
 579                 return nfserr_grace;
 580         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 581                              remove->rm_name, remove->rm_namelen);
 582         if (status == nfserr_symlink)
 583                 return nfserr_notdir;
 584         if (!status) {
 585                 fh_unlock(&cstate->current_fh);
 586                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 587         }
 588         return status;
 589 }
 590
 591 static __be32
 592 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593              struct nfsd4_rename *rename)
 594 {
 595         __be32 status = nfserr_nofilehandle;
 596
 597         if (!cstate->save_fh.fh_dentry)
 598                 return status;
 599         if (nfs4_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 600                                         & NFSEXP_NOSUBTREECHECK))
 601                 return nfserr_grace;
 602         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 603                              rename->rn_snamelen, &cstate->current_fh,
 604                              rename->rn_tname, rename->rn_tnamelen);
 605
 606         /* the underlying filesystem returns different error's than required
 607          * by NFSv4. both save_fh and current_fh have been verified.. */
 608         if (status == nfserr_isdir)
 609                 status = nfserr_exist;
 610         else if ((status == nfserr_notdir) &&
 611                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 612                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 613                 status = nfserr_exist;
 614         else if (status == nfserr_symlink)
 615                 status = nfserr_notdir;
 616
 617         if (!status) {
 618                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 619                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 620         }
 621         return status;
 622 }
 623
 624 static __be32
 625 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 626               struct nfsd4_secinfo *secinfo)
 627 {
 628         struct svc_fh resfh;
 629         struct svc_export *exp;
 630         struct dentry *dentry;
 631         __be32 err;
 632
 633         fh_init(&resfh, NFS4_FHSIZE);
 634         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 635                                     secinfo->si_name, secinfo->si_namelen,
 636                                     &exp, &dentry);
 637         if (err)
 638                 return err;
 639         if (dentry->d_inode == NULL) {
 640                 exp_put(exp);
 641                 err = nfserr_noent;
 642         } else
 643                 secinfo->si_exp = exp;
 644         dput(dentry);
 645         return err;
 646 }
 647
 648 static __be32
 649 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 650               struct nfsd4_setattr *setattr)
 651 {
 652         __be32 status = nfs_ok;
 653
 654         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 655                 nfs4_lock_state();
 656                 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
 657                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 658                 nfs4_unlock_state();
 659                 if (status) {
 660                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 661                         return status;
 662                 }
 663         }
 664         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 665         if (status)
 666                 return status;
 667         status = nfs_ok;
 668         if (setattr->sa_acl != NULL)
 669                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 670                                             setattr->sa_acl);
 671         if (status)
 672                 goto out;
 673         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 674                                 0, (time_t)0);
 675 out:
 676         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 677         return status;
 678 }
 679
 680 static __be32
 681 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 682             struct nfsd4_write *write)
 683 {
 684         stateid_t *stateid = &write->wr_stateid;
 685         struct file *filp = NULL;
 686         u32 *p;
 687         __be32 status = nfs_ok;
 688
 689         /* no need to check permission - this will be done in nfsd_write() */
 690
 691         if (write->wr_offset >= OFFSET_MAX)
 692                 return nfserr_inval;
 693
 694         nfs4_lock_state();
 695         status = nfs4_preprocess_stateid_op(&cstate->current_fh, stateid,
 696                                         CHECK_FH | WR_STATE, &filp);
 697         if (filp)
 698                 get_file(filp);
 699         nfs4_unlock_state();
 700
 701         if (status) {
 702                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 703                 return status;
 704         }
 705
 706         write->wr_bytes_written = write->wr_buflen;
 707         write->wr_how_written = write->wr_stable_how;
 708         p = (u32 *)write->wr_verifier.data;
 709         *p++ = nfssvc_boot.tv_sec;
 710         *p++ = nfssvc_boot.tv_usec;
 711
 712         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 713                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 714                              write->wr_buflen, &write->wr_how_written);
 715         if (filp)
 716                 fput(filp);
 717
 718         if (status == nfserr_symlink)
 719                 status = nfserr_inval;
 720         return status;
 721 }
 722
 723 /* This routine never returns NFS_OK!  If there are no other errors, it
 724  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 725  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 726  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 727  */
 728 static __be32
 729 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 730              struct nfsd4_verify *verify)
 731 {
 732         __be32 *buf, *p;
 733         int count;
 734         __be32 status;
 735
 736         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 737         if (status)
 738                 return status;
 739
 740         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 741             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 742                 return nfserr_attrnotsupp;
 743         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 744             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 745                 return nfserr_inval;
 746         if (verify->ve_attrlen & 3)
 747                 return nfserr_inval;
 748
 749         /* count in words:
 750          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 751          */
 752         count = 4 + (verify->ve_attrlen >> 2);
 753         buf = kmalloc(count << 2, GFP_KERNEL);
 754         if (!buf)
 755                 return nfserr_resource;
 756
 757         status = nfsd4_encode_fattr(&cstate->current_fh,
 758                                     cstate->current_fh.fh_export,
 759                                     cstate->current_fh.fh_dentry, buf,
 760                                     &count, verify->ve_bmval,
 761                                     rqstp, 0);
 762
 763         /* this means that nfsd4_encode_fattr() ran out of space */
 764         if (status == nfserr_resource && count == 0)
 765                 status = nfserr_not_same;
 766         if (status)
 767                 goto out_kfree;
 768
 769         p = buf + 3;
 770         status = nfserr_not_same;
 771         if (ntohl(*p++) != verify->ve_attrlen)
 772                 goto out_kfree;
 773         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 774                 status = nfserr_same;
 775
 776 out_kfree:
 777         kfree(buf);
 778         return status;
 779 }
 780
 781 static __be32
 782 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 783               struct nfsd4_verify *verify)
 784 {
 785         __be32 status;
 786
 787         status = _nfsd4_verify(rqstp, cstate, verify);
 788         return status == nfserr_not_same ? nfs_ok : status;
 789 }
 790
 791 static __be32
 792 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 793              struct nfsd4_verify *verify)
 794 {
 795         __be32 status;
 796
 797         status = _nfsd4_verify(rqstp, cstate, verify);
 798         return status == nfserr_same ? nfs_ok : status;
 799 }
 800
 801 /*
 802  * NULL call.
 803  */
 804 static __be32
 805 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 806 {
 807         return nfs_ok;
 808 }
 809
 810 static inline void nfsd4_increment_op_stats(u32 opnum)
 811 {
 812         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 813                 nfsdstats.nfs4_opcount[opnum]++;
 814 }
 815
 816 static void cstate_free(struct nfsd4_compound_state *cstate)
 817 {
 818         if (cstate == NULL)
 819                 return;
 820         fh_put(&cstate->current_fh);
 821         fh_put(&cstate->save_fh);
 822         BUG_ON(cstate->replay_owner);
 823         kfree(cstate);
 824 }
 825
 826 static struct nfsd4_compound_state *cstate_alloc(void)
 827 {
 828         struct nfsd4_compound_state *cstate;
 829
 830         cstate = kmalloc(sizeof(struct nfsd4_compound_state), GFP_KERNEL);
 831         if (cstate == NULL)
 832                 return NULL;
 833         fh_init(&cstate->current_fh, NFS4_FHSIZE);
 834         fh_init(&cstate->save_fh, NFS4_FHSIZE);
 835         cstate->replay_owner = NULL;
 836         return cstate;
 837 }
 838
 839 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 840                               void *);
 841
 842 struct nfsd4_operation {
 843         nfsd4op_func op_func;
 844         u32 op_flags;
 845 /* Most ops require a valid current filehandle; a few don't: */
 846 #define ALLOWED_WITHOUT_FH 1
 847 /* GETATTR and ops not listed as returning NFS4ERR_MOVED: */
 848 #define ALLOWED_ON_ABSENT_FS 2
 849 };
 850
 851 static struct nfsd4_operation nfsd4_ops[];
 852
 853 /*
 854  * COMPOUND call.
 855  */
 856 static __be32
 857 nfsd4_proc_compound(struct svc_rqst *rqstp,
 858                     struct nfsd4_compoundargs *args,
 859                     struct nfsd4_compoundres *resp)
 860 {
 861         struct nfsd4_op *op;
 862         struct nfsd4_operation *opdesc;
 863         struct nfsd4_compound_state *cstate = NULL;
 864         int             slack_bytes;
 865         __be32          status;
 866
 867         status = nfserr_resource;
 868         cstate = cstate_alloc();
 869         if (cstate == NULL)
 870                 goto out;
 871
 872         resp->xbuf = &rqstp->rq_res;
 873         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 874         resp->tagp = resp->p;
 875         /* reserve space for: taglen, tag, and opcnt */
 876         resp->p += 2 + XDR_QUADLEN(args->taglen);
 877         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 878         resp->taglen = args->taglen;
 879         resp->tag = args->tag;
 880         resp->opcnt = 0;
 881         resp->rqstp = rqstp;
 882
 883         /*
 884          * According to RFC3010, this takes precedence over all other errors.
 885          */
 886         status = nfserr_minor_vers_mismatch;
 887         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 888                 goto out;
 889
 890         status = nfs_ok;
 891         while (!status && resp->opcnt < args->opcnt) {
 892                 op = &args->ops[resp->opcnt++];
 893
 894                 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
 895
 896                 /*
 897                  * The XDR decode routines may have pre-set op->status;
 898                  * for example, if there is a miscellaneous XDR error
 899                  * it will be set to nfserr_bad_xdr.
 900                  */
 901                 if (op->status)
 902                         goto encode_op;
 903
 904                 /* We must be able to encode a successful response to
 905                  * this operation, with enough room left over to encode a
 906                  * failed response to the next operation.  If we don't
 907                  * have enough room, fail with ERR_RESOURCE.
 908                  */
 909                 slack_bytes = (char *)resp->end - (char *)resp->p;
 910                 if (slack_bytes < COMPOUND_SLACK_SPACE
 911                                 + COMPOUND_ERR_SLACK_SPACE) {
 912                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
 913                         op->status = nfserr_resource;
 914                         goto encode_op;
 915                 }
 916
 917                 opdesc = &nfsd4_ops[op->opnum];
 918
 919                 if (!cstate->current_fh.fh_dentry) {
 920                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
 921                                 op->status = nfserr_nofilehandle;
 922                                 goto encode_op;
 923                         }
 924                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
 925                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
 926                         op->status = nfserr_moved;
 927                         goto encode_op;
 928                 }
 929
 930                 if (opdesc->op_func)
 931                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
 932                 else
 933                         BUG_ON(op->status == nfs_ok);
 934
 935 encode_op:
 936                 if (op->status == nfserr_replay_me) {
 937                         op->replay = &cstate->replay_owner->so_replay;
 938                         nfsd4_encode_replay(resp, op);
 939                         status = op->status = op->replay->rp_status;
 940                 } else {
 941                         nfsd4_encode_operation(resp, op);
 942                         status = op->status;
 943                 }
 944                 if (cstate->replay_owner) {
 945                         nfs4_put_stateowner(cstate->replay_owner);
 946                         cstate->replay_owner = NULL;
 947                 }
 948                 /* XXX Ugh, we need to get rid of this kind of special case: */
 949                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 950                         fput(op->u.read.rd_filp);
 951
 952                 nfsd4_increment_op_stats(op->opnum);
 953         }
 954
 955 out:
 956         nfsd4_release_compoundargs(args);
 957         cstate_free(cstate);
 958         dprintk("nfsv4 compound returned %d\n", ntohl(status));
 959         return status;
 960 }
 961
 962 static struct nfsd4_operation nfsd4_ops[OP_RELEASE_LOCKOWNER+1] = {
 963         [OP_ACCESS] = {
 964                 .op_func = (nfsd4op_func)nfsd4_access,
 965         },
 966         [OP_CLOSE] = {
 967                 .op_func = (nfsd4op_func)nfsd4_close,
 968         },
 969         [OP_COMMIT] = {
 970                 .op_func = (nfsd4op_func)nfsd4_commit,
 971         },
 972         [OP_CREATE] = {
 973                 .op_func = (nfsd4op_func)nfsd4_create,
 974         },
 975         [OP_DELEGRETURN] = {
 976                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
 977         },
 978         [OP_GETATTR] = {
 979                 .op_func = (nfsd4op_func)nfsd4_getattr,
 980                 .op_flags = ALLOWED_ON_ABSENT_FS,
 981         },
 982         [OP_GETFH] = {
 983                 .op_func = (nfsd4op_func)nfsd4_getfh,
 984         },
 985         [OP_LINK] = {
 986                 .op_func = (nfsd4op_func)nfsd4_link,
 987         },
 988         [OP_LOCK] = {
 989                 .op_func = (nfsd4op_func)nfsd4_lock,
 990         },
 991         [OP_LOCKT] = {
 992                 .op_func = (nfsd4op_func)nfsd4_lockt,
 993         },
 994         [OP_LOCKU] = {
 995                 .op_func = (nfsd4op_func)nfsd4_locku,
 996         },
 997         [OP_LOOKUP] = {
 998                 .op_func = (nfsd4op_func)nfsd4_lookup,
 999         },
1000         [OP_LOOKUPP] = {
1001                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1002         },
1003         [OP_NVERIFY] = {
1004                 .op_func = (nfsd4op_func)nfsd4_nverify,
1005         },
1006         [OP_OPEN] = {
1007                 .op_func = (nfsd4op_func)nfsd4_open,
1008         },
1009         [OP_OPEN_CONFIRM] = {
1010                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1011         },
1012         [OP_OPEN_DOWNGRADE] = {
1013                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1014         },
1015         [OP_PUTFH] = {
1016                 .op_func = (nfsd4op_func)nfsd4_putfh,
1017                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1018         },
1019         [OP_PUTPUBFH] = {
1020                 /* unsupported; just for future reference: */
1021                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1022         },
1023         [OP_PUTROOTFH] = {
1024                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1025                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1026         },
1027         [OP_READ] = {
1028                 .op_func = (nfsd4op_func)nfsd4_read,
1029         },
1030         [OP_READDIR] = {
1031                 .op_func = (nfsd4op_func)nfsd4_readdir,
1032         },
1033         [OP_READLINK] = {
1034                 .op_func = (nfsd4op_func)nfsd4_readlink,
1035         },
1036         [OP_REMOVE] = {
1037                 .op_func = (nfsd4op_func)nfsd4_remove,
1038         },
1039         [OP_RENAME] = {
1040                 .op_func = (nfsd4op_func)nfsd4_rename,
1041         },
1042         [OP_RENEW] = {
1043                 .op_func = (nfsd4op_func)nfsd4_renew,
1044                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1045         },
1046         [OP_RESTOREFH] = {
1047                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1048                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1049         },
1050         [OP_SAVEFH] = {
1051                 .op_func = (nfsd4op_func)nfsd4_savefh,
1052         },
1053         [OP_SECINFO] = {
1054                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1055         },
1056         [OP_SETATTR] = {
1057                 .op_func = (nfsd4op_func)nfsd4_setattr,
1058         },
1059         [OP_SETCLIENTID] = {
1060                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1061                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1062         },
1063         [OP_SETCLIENTID_CONFIRM] = {
1064                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1065                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1066         },
1067         [OP_VERIFY] = {
1068                 .op_func = (nfsd4op_func)nfsd4_verify,
1069         },
1070         [OP_WRITE] = {
1071                 .op_func = (nfsd4op_func)nfsd4_write,
1072         },
1073         [OP_RELEASE_LOCKOWNER] = {
1074                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1075                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1076         },
1077 };
1078
1079 #define nfs4svc_decode_voidargs         NULL
1080 #define nfs4svc_release_void            NULL
1081 #define nfsd4_voidres                   nfsd4_voidargs
1082 #define nfs4svc_release_compound        NULL
1083 struct nfsd4_voidargs { int dummy; };
1084
1085 #define PROC(name, argt, rest, relt, cache, respsize)   \
1086  { (svc_procfunc) nfsd4_proc_##name,            \
1087    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
1088    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
1089    (kxdrproc_t) nfs4svc_release_##relt,         \
1090    sizeof(struct nfsd4_##argt##args),           \
1091    sizeof(struct nfsd4_##rest##res),            \
1092    0,                                           \
1093    cache,                                       \
1094    respsize,                                    \
1095  }
1096
1097 /*
1098  * TODO: At the present time, the NFSv4 server does not do XID caching
1099  * of requests.  Implementing XID caching would not be a serious problem,
1100  * although it would require a mild change in interfaces since one
1101  * doesn't know whether an NFSv4 request is idempotent until after the
1102  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1103  * Astrand's regression testsuite for NFSv4 servers), which reuses
1104  * XID's liberally, so I've left it unimplemented until pynfs generates
1105  * better XID's.
1106  */
1107 static struct svc_procedure             nfsd_procedures4[2] = {
1108   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
1109   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
1110 };
1111
1112 struct svc_version      nfsd_version4 = {
1113                 .vs_vers        = 4,
1114                 .vs_nproc       = 2,
1115                 .vs_proc        = nfsd_procedures4,
1116                 .vs_dispatch    = nfsd_dispatch,
1117                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1118 };
1119
1120 /*
1121  * Local variables:
1122  *  c-basic-offset: 8
1123  * End:
1124  */