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  * Note: some routines in this file are just trivial wrappers
  38  * (e.g. nfsd4_lookup()) defined solely for the sake of consistent
  39  * naming.  Since all such routines have been declared "inline",
  40  * there shouldn't be any associated overhead.  At some point in
  41  * the future, I might inline these "by hand" to clean up a
  42  * little.
  43  */
  44
  45 #include <linux/param.h>
  46 #include <linux/major.h>
  47 #include <linux/slab.h>
  48 #include <linux/file.h>
  49
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/nfsd/nfsd.h>
  52 #include <linux/nfsd/cache.h>
  53 #include <linux/nfs4.h>
  54 #include <linux/nfsd/state.h>
  55 #include <linux/nfsd/xdr4.h>
  56 #include <linux/nfs4_acl.h>
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  59
  60 static inline void
  61 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
  62 {
  63         fh_put(dst);
  64         dget(src->fh_dentry);
  65         if (src->fh_export)
  66                 cache_get(&src->fh_export->h);
  67         *dst = *src;
  68 }
  69
  70 static int
  71 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  72 {
  73         int accmode, status;
  74
  75         if (open->op_truncate &&
  76                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  77                 return nfserr_inval;
  78
  79         accmode = MAY_NOP;
  80         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  81                 accmode = MAY_READ;
  82         if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE)
  83                 accmode |= (MAY_WRITE | MAY_TRUNC);
  84         accmode |= MAY_OWNER_OVERRIDE;
  85
  86         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  87
  88         return status;
  89 }
  90
  91 static int
  92 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  93 {
  94         struct svc_fh resfh;
  95         int status;
  96
  97         fh_init(&resfh, NFS4_FHSIZE);
  98         open->op_truncate = 0;
  99
 100         if (open->op_create) {
 101                 /*
 102                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 103                  * in NFSv4 as in v3.
 104                  */
 105                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 106                                         open->op_fname.len, &open->op_iattr,
 107                                         &resfh, open->op_createmode,
 108                                         (u32 *)open->op_verf.data, &open->op_truncate);
 109         }
 110         else {
 111                 status = nfsd_lookup(rqstp, current_fh,
 112                                      open->op_fname.data, open->op_fname.len, &resfh);
 113                 fh_unlock(current_fh);
 114         }
 115
 116         if (!status) {
 117                 set_change_info(&open->op_cinfo, current_fh);
 118
 119                 /* set reply cache */
 120                 fh_dup2(current_fh, &resfh);
 121                 open->op_stateowner->so_replay.rp_openfh_len =
 122                         resfh.fh_handle.fh_size;
 123                 memcpy(open->op_stateowner->so_replay.rp_openfh,
 124                                 &resfh.fh_handle.fh_base,
 125                                 resfh.fh_handle.fh_size);
 126
 127                 status = do_open_permission(rqstp, current_fh, open);
 128         }
 129
 130         fh_put(&resfh);
 131         return status;
 132 }
 133
 134 static int
 135 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 136 {
 137         int status;
 138
 139         /* Only reclaims from previously confirmed clients are valid */
 140         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 141                 return status;
 142
 143         /* We don't know the target directory, and therefore can not
 144         * set the change info
 145         */
 146
 147         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 148
 149         /* set replay cache */
 150         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 151         memcpy(open->op_stateowner->so_replay.rp_openfh,
 152                 &current_fh->fh_handle.fh_base,
 153                 current_fh->fh_handle.fh_size);
 154
 155         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 156                 (open->op_iattr.ia_size == 0);
 157
 158         status = do_open_permission(rqstp, current_fh, open);
 159
 160         return status;
 161 }
 162
 163
 164 static inline int
 165 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, struct nfs4_stateowner **replay_owner)
 166 {
 167         int status;
 168         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 169                 (int)open->op_fname.len, open->op_fname.data,
 170                 open->op_stateowner);
 171
 172         /* This check required by spec. */
 173         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 174                 return nfserr_inval;
 175
 176         nfs4_lock_state();
 177
 178         /* check seqid for replay. set nfs4_owner */
 179         status = nfsd4_process_open1(open);
 180         if (status == NFSERR_REPLAY_ME) {
 181                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 182                 fh_put(current_fh);
 183                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 184                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 185                                 rp->rp_openfh_len);
 186                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 187                 if (status)
 188                         dprintk("nfsd4_open: replay failed"
 189                                 " restoring previous filehandle\n");
 190                 else
 191                         status = NFSERR_REPLAY_ME;
 192         }
 193         if (status)
 194                 goto out;
 195
 196         /* Openowner is now set, so sequence id will get bumped.  Now we need
 197          * these checks before we do any creates: */
 198         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 199                 return nfserr_grace;
 200         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 201                 return nfserr_no_grace;
 202
 203         switch (open->op_claim_type) {
 204                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 205                         status = nfserr_inval;
 206                         if (open->op_create)
 207                                 goto out;
 208                         /* fall through */
 209                 case NFS4_OPEN_CLAIM_NULL:
 210                         /*
 211                          * (1) set CURRENT_FH to the file being opened,
 212                          * creating it if necessary, (2) set open->op_cinfo,
 213                          * (3) set open->op_truncate if the file is to be
 214                          * truncated after opening, (4) do permission checking.
 215                          */
 216                         status = do_open_lookup(rqstp, current_fh, open);
 217                         if (status)
 218                                 goto out;
 219                         break;
 220                 case NFS4_OPEN_CLAIM_PREVIOUS:
 221                         open->op_stateowner->so_confirmed = 1;
 222                         /*
 223                          * The CURRENT_FH is already set to the file being
 224                          * opened.  (1) set open->op_cinfo, (2) set
 225                          * open->op_truncate if the file is to be truncated
 226                          * after opening, (3) do permission checking.
 227                         */
 228                         status = do_open_fhandle(rqstp, current_fh, open);
 229                         if (status)
 230                                 goto out;
 231                         break;
 232                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 233                         open->op_stateowner->so_confirmed = 1;
 234                         printk("NFSD: unsupported OPEN claim type %d\n",
 235                                 open->op_claim_type);
 236                         status = nfserr_notsupp;
 237                         goto out;
 238                 default:
 239                         printk("NFSD: Invalid OPEN claim type %d\n",
 240                                 open->op_claim_type);
 241                         status = nfserr_inval;
 242                         goto out;
 243         }
 244         /*
 245          * nfsd4_process_open2() does the actual opening of the file.  If
 246          * successful, it (1) truncates the file if open->op_truncate was
 247          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 248          */
 249         status = nfsd4_process_open2(rqstp, current_fh, open);
 250 out:
 251         if (open->op_stateowner) {
 252                 nfs4_get_stateowner(open->op_stateowner);
 253                 *replay_owner = open->op_stateowner;
 254         }
 255         nfs4_unlock_state();
 256         return status;
 257 }
 258
 259 /*
 260  * filehandle-manipulating ops.
 261  */
 262 static inline int
 263 nfsd4_getfh(struct svc_fh *current_fh, struct svc_fh **getfh)
 264 {
 265         if (!current_fh->fh_dentry)
 266                 return nfserr_nofilehandle;
 267
 268         *getfh = current_fh;
 269         return nfs_ok;
 270 }
 271
 272 static inline int
 273 nfsd4_putfh(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_putfh *putfh)
 274 {
 275         fh_put(current_fh);
 276         current_fh->fh_handle.fh_size = putfh->pf_fhlen;
 277         memcpy(&current_fh->fh_handle.fh_base, putfh->pf_fhval, putfh->pf_fhlen);
 278         return fh_verify(rqstp, current_fh, 0, MAY_NOP);
 279 }
 280
 281 static inline int
 282 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 283 {
 284         int status;
 285
 286         fh_put(current_fh);
 287         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 288                               &rqstp->rq_chandle);
 289         if (!status)
 290                 status = nfserrno(nfsd_setuser(rqstp, current_fh->fh_export));
 291         return status;
 292 }
 293
 294 static inline int
 295 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 296 {
 297         if (!save_fh->fh_dentry)
 298                 return nfserr_restorefh;
 299
 300         fh_dup2(current_fh, save_fh);
 301         return nfs_ok;
 302 }
 303
 304 static inline int
 305 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 306 {
 307         if (!current_fh->fh_dentry)
 308                 return nfserr_nofilehandle;
 309
 310         fh_dup2(save_fh, current_fh);
 311         return nfs_ok;
 312 }
 313
 314 /*
 315  * misc nfsv4 ops
 316  */
 317 static inline int
 318 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 319 {
 320         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 321                 return nfserr_inval;
 322
 323         access->ac_resp_access = access->ac_req_access;
 324         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 325 }
 326
 327 static inline int
 328 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 329 {
 330         int status;
 331
 332         u32 *p = (u32 *)commit->co_verf.data;
 333         *p++ = nfssvc_boot.tv_sec;
 334         *p++ = nfssvc_boot.tv_usec;
 335
 336         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 337         if (status == nfserr_symlink)
 338                 status = nfserr_inval;
 339         return status;
 340 }
 341
 342 static int
 343 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 344 {
 345         struct svc_fh resfh;
 346         int status;
 347         dev_t rdev;
 348
 349         fh_init(&resfh, NFS4_FHSIZE);
 350
 351         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 352         if (status == nfserr_symlink)
 353                 status = nfserr_notdir;
 354         if (status)
 355                 return status;
 356
 357         switch (create->cr_type) {
 358         case NF4LNK:
 359                 /* ugh! we have to null-terminate the linktext, or
 360                  * vfs_symlink() will choke.  it is always safe to
 361                  * null-terminate by brute force, since at worst we
 362                  * will overwrite the first byte of the create namelen
 363                  * in the XDR buffer, which has already been extracted
 364                  * during XDR decode.
 365                  */
 366                 create->cr_linkname[create->cr_linklen] = 0;
 367
 368                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 369                                       create->cr_namelen, create->cr_linkname,
 370                                       create->cr_linklen, &resfh, &create->cr_iattr);
 371                 break;
 372
 373         case NF4BLK:
 374                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 375                 if (MAJOR(rdev) != create->cr_specdata1 ||
 376                     MINOR(rdev) != create->cr_specdata2)
 377                         return nfserr_inval;
 378                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 379                                      create->cr_namelen, &create->cr_iattr,
 380                                      S_IFBLK, rdev, &resfh);
 381                 break;
 382
 383         case NF4CHR:
 384                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 385                 if (MAJOR(rdev) != create->cr_specdata1 ||
 386                     MINOR(rdev) != create->cr_specdata2)
 387                         return nfserr_inval;
 388                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 389                                      create->cr_namelen, &create->cr_iattr,
 390                                      S_IFCHR, rdev, &resfh);
 391                 break;
 392
 393         case NF4SOCK:
 394                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 395                                      create->cr_namelen, &create->cr_iattr,
 396                                      S_IFSOCK, 0, &resfh);
 397                 break;
 398
 399         case NF4FIFO:
 400                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 401                                      create->cr_namelen, &create->cr_iattr,
 402                                      S_IFIFO, 0, &resfh);
 403                 break;
 404
 405         case NF4DIR:
 406                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 407                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 408                                      create->cr_namelen, &create->cr_iattr,
 409                                      S_IFDIR, 0, &resfh);
 410                 break;
 411
 412         default:
 413                 status = nfserr_badtype;
 414         }
 415
 416         if (!status) {
 417                 fh_unlock(current_fh);
 418                 set_change_info(&create->cr_cinfo, current_fh);
 419                 fh_dup2(current_fh, &resfh);
 420         }
 421
 422         fh_put(&resfh);
 423         return status;
 424 }
 425
 426 static inline int
 427 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 428 {
 429         int status;
 430
 431         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 432         if (status)
 433                 return status;
 434
 435         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 436                 return nfserr_inval;
 437
 438         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 439         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 440
 441         getattr->ga_fhp = current_fh;
 442         return nfs_ok;
 443 }
 444
 445 static inline int
 446 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 447            struct svc_fh *save_fh, struct nfsd4_link *link)
 448 {
 449         int status = nfserr_nofilehandle;
 450
 451         if (!save_fh->fh_dentry)
 452                 return status;
 453         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 454         if (!status)
 455                 set_change_info(&link->li_cinfo, current_fh);
 456         return status;
 457 }
 458
 459 static int
 460 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 461 {
 462         struct svc_fh tmp_fh;
 463         int ret;
 464
 465         fh_init(&tmp_fh, NFS4_FHSIZE);
 466         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 467                               &rqstp->rq_chandle)) != 0)
 468                 return ret;
 469         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 470                 fh_put(&tmp_fh);
 471                 return nfserr_noent;
 472         }
 473         fh_put(&tmp_fh);
 474         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 475 }
 476
 477 static inline int
 478 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 479 {
 480         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 481 }
 482
 483 static inline int
 484 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 485 {
 486         int status;
 487
 488         /* no need to check permission - this will be done in nfsd_read() */
 489
 490         read->rd_filp = NULL;
 491         if (read->rd_offset >= OFFSET_MAX)
 492                 return nfserr_inval;
 493
 494         nfs4_lock_state();
 495         /* check stateid */
 496         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 497                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 498                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 499                 goto out;
 500         }
 501         if (read->rd_filp)
 502                 get_file(read->rd_filp);
 503         status = nfs_ok;
 504 out:
 505         nfs4_unlock_state();
 506         read->rd_rqstp = rqstp;
 507         read->rd_fhp = current_fh;
 508         return status;
 509 }
 510
 511 static inline int
 512 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 513 {
 514         u64 cookie = readdir->rd_cookie;
 515         static const nfs4_verifier zeroverf;
 516
 517         /* no need to check permission - this will be done in nfsd_readdir() */
 518
 519         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 520                 return nfserr_inval;
 521
 522         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 523         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 524
 525         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 526             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 527                 return nfserr_bad_cookie;
 528
 529         readdir->rd_rqstp = rqstp;
 530         readdir->rd_fhp = current_fh;
 531         return nfs_ok;
 532 }
 533
 534 static inline int
 535 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 536 {
 537         readlink->rl_rqstp = rqstp;
 538         readlink->rl_fhp = current_fh;
 539         return nfs_ok;
 540 }
 541
 542 static inline int
 543 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 544 {
 545         int status;
 546
 547         if (nfs4_in_grace())
 548                 return nfserr_grace;
 549         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 550         if (status == nfserr_symlink)
 551                 return nfserr_notdir;
 552         if (!status) {
 553                 fh_unlock(current_fh);
 554                 set_change_info(&remove->rm_cinfo, current_fh);
 555         }
 556         return status;
 557 }
 558
 559 static inline int
 560 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 561              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 562 {
 563         int status = nfserr_nofilehandle;
 564
 565         if (!save_fh->fh_dentry)
 566                 return status;
 567         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 568                                         & NFSEXP_NOSUBTREECHECK))
 569                 return nfserr_grace;
 570         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 571                              rename->rn_snamelen, current_fh,
 572                              rename->rn_tname, rename->rn_tnamelen);
 573
 574         /* the underlying filesystem returns different error's than required
 575          * by NFSv4. both save_fh and current_fh have been verified.. */
 576         if (status == nfserr_isdir)
 577                 status = nfserr_exist;
 578         else if ((status == nfserr_notdir) &&
 579                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 580                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 581                 status = nfserr_exist;
 582         else if (status == nfserr_symlink)
 583                 status = nfserr_notdir;
 584
 585         if (!status) {
 586                 set_change_info(&rename->rn_sinfo, current_fh);
 587                 set_change_info(&rename->rn_tinfo, save_fh);
 588         }
 589         return status;
 590 }
 591
 592 static inline int
 593 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 594 {
 595         int status = nfs_ok;
 596
 597         if (!current_fh->fh_dentry)
 598                 return nfserr_nofilehandle;
 599
 600         status = nfs_ok;
 601         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 602                 nfs4_lock_state();
 603                 status = nfs4_preprocess_stateid_op(current_fh,
 604                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 605                 nfs4_unlock_state();
 606                 if (status) {
 607                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!");
 608                         return status;
 609                 }
 610         }
 611         status = nfs_ok;
 612         if (setattr->sa_acl != NULL)
 613                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 614         if (status)
 615                 return status;
 616         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 617                                 0, (time_t)0);
 618         return status;
 619 }
 620
 621 static inline int
 622 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 623 {
 624         stateid_t *stateid = &write->wr_stateid;
 625         struct file *filp = NULL;
 626         u32 *p;
 627         int status = nfs_ok;
 628
 629         /* no need to check permission - this will be done in nfsd_write() */
 630
 631         if (write->wr_offset >= OFFSET_MAX)
 632                 return nfserr_inval;
 633
 634         nfs4_lock_state();
 635         status = nfs4_preprocess_stateid_op(current_fh, stateid,
 636                                         CHECK_FH | WR_STATE, &filp);
 637         if (filp)
 638                 get_file(filp);
 639         nfs4_unlock_state();
 640
 641         if (status) {
 642                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 643                 return status;
 644         }
 645
 646         write->wr_bytes_written = write->wr_buflen;
 647         write->wr_how_written = write->wr_stable_how;
 648         p = (u32 *)write->wr_verifier.data;
 649         *p++ = nfssvc_boot.tv_sec;
 650         *p++ = nfssvc_boot.tv_usec;
 651
 652         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
 653                         write->wr_vec, write->wr_vlen, write->wr_buflen,
 654                         &write->wr_how_written);
 655         if (filp)
 656                 fput(filp);
 657
 658         if (status == nfserr_symlink)
 659                 status = nfserr_inval;
 660         return status;
 661 }
 662
 663 /* This routine never returns NFS_OK!  If there are no other errors, it
 664  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 665  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 666  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 667  */
 668 static int
 669 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 670 {
 671         u32 *buf, *p;
 672         int count;
 673         int status;
 674
 675         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 676         if (status)
 677                 return status;
 678
 679         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 680             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 681                 return nfserr_attrnotsupp;
 682         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 683             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 684                 return nfserr_inval;
 685         if (verify->ve_attrlen & 3)
 686                 return nfserr_inval;
 687
 688         /* count in words:
 689          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 690          */
 691         count = 4 + (verify->ve_attrlen >> 2);
 692         buf = kmalloc(count << 2, GFP_KERNEL);
 693         if (!buf)
 694                 return nfserr_resource;
 695
 696         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 697                                     current_fh->fh_dentry, buf,
 698                                     &count, verify->ve_bmval,
 699                                     rqstp);
 700
 701         /* this means that nfsd4_encode_fattr() ran out of space */
 702         if (status == nfserr_resource && count == 0)
 703                 status = nfserr_not_same;
 704         if (status)
 705                 goto out_kfree;
 706
 707         p = buf + 3;
 708         status = nfserr_not_same;
 709         if (ntohl(*p++) != verify->ve_attrlen)
 710                 goto out_kfree;
 711         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 712                 status = nfserr_same;
 713
 714 out_kfree:
 715         kfree(buf);
 716         return status;
 717 }
 718
 719 /*
 720  * NULL call.
 721  */
 722 static int
 723 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 724 {
 725         return nfs_ok;
 726 }
 727
 728
 729 /*
 730  * COMPOUND call.
 731  */
 732 static int
 733 nfsd4_proc_compound(struct svc_rqst *rqstp,
 734                     struct nfsd4_compoundargs *args,
 735                     struct nfsd4_compoundres *resp)
 736 {
 737         struct nfsd4_op *op;
 738         struct svc_fh   *current_fh = NULL;
 739         struct svc_fh   *save_fh = NULL;
 740         struct nfs4_stateowner *replay_owner = NULL;
 741         int             slack_space;    /* in words, not bytes! */
 742         int             status;
 743
 744         status = nfserr_resource;
 745         current_fh = kmalloc(sizeof(*current_fh), GFP_KERNEL);
 746         if (current_fh == NULL)
 747                 goto out;
 748         fh_init(current_fh, NFS4_FHSIZE);
 749         save_fh = kmalloc(sizeof(*save_fh), GFP_KERNEL);
 750         if (save_fh == NULL)
 751                 goto out;
 752         fh_init(save_fh, NFS4_FHSIZE);
 753
 754         resp->xbuf = &rqstp->rq_res;
 755         resp->p = rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len;
 756         resp->tagp = resp->p;
 757         /* reserve space for: taglen, tag, and opcnt */
 758         resp->p += 2 + XDR_QUADLEN(args->taglen);
 759         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
 760         resp->taglen = args->taglen;
 761         resp->tag = args->tag;
 762         resp->opcnt = 0;
 763         resp->rqstp = rqstp;
 764
 765         /*
 766          * According to RFC3010, this takes precedence over all other errors.
 767          */
 768         status = nfserr_minor_vers_mismatch;
 769         if (args->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
 770                 goto out;
 771
 772         status = nfs_ok;
 773         while (!status && resp->opcnt < args->opcnt) {
 774                 op = &args->ops[resp->opcnt++];
 775
 776                 dprintk("nfsv4 compound op #%d: %d\n", resp->opcnt, op->opnum);
 777
 778                 /*
 779                  * The XDR decode routines may have pre-set op->status;
 780                  * for example, if there is a miscellaneous XDR error
 781                  * it will be set to nfserr_bad_xdr.
 782                  */
 783                 if (op->status)
 784                         goto encode_op;
 785
 786                 /* We must be able to encode a successful response to
 787                  * this operation, with enough room left over to encode a
 788                  * failed response to the next operation.  If we don't
 789                  * have enough room, fail with ERR_RESOURCE.
 790                  */
 791 /* FIXME - is slack_space *really* words, or bytes??? - neilb */
 792                 slack_space = (char *)resp->end - (char *)resp->p;
 793                 if (slack_space < COMPOUND_SLACK_SPACE + COMPOUND_ERR_SLACK_SPACE) {
 794                         BUG_ON(slack_space < COMPOUND_ERR_SLACK_SPACE);
 795                         op->status = nfserr_resource;
 796                         goto encode_op;
 797                 }
 798
 799                 /* All operations except RENEW, SETCLIENTID, RESTOREFH
 800                 * SETCLIENTID_CONFIRM, PUTFH and PUTROOTFH
 801                 * require a valid current filehandle
 802                 *
 803                 * SETATTR NOFILEHANDLE error handled in nfsd4_setattr
 804                 * due to required returned bitmap argument
 805                 */
 806                 if ((!current_fh->fh_dentry) &&
 807                    !((op->opnum == OP_PUTFH) || (op->opnum == OP_PUTROOTFH) ||
 808                    (op->opnum == OP_SETCLIENTID) ||
 809                    (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 810                    (op->opnum == OP_RENEW) || (op->opnum == OP_RESTOREFH) ||
 811                    (op->opnum == OP_RELEASE_LOCKOWNER) ||
 812                    (op->opnum == OP_SETATTR))) {
 813                         op->status = nfserr_nofilehandle;
 814                         goto encode_op;
 815                 }
 816                 switch (op->opnum) {
 817                 case OP_ACCESS:
 818                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 819                         break;
 820                 case OP_CLOSE:
 821                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
 822                         break;
 823                 case OP_COMMIT:
 824                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 825                         break;
 826                 case OP_CREATE:
 827                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 828                         break;
 829                 case OP_DELEGRETURN:
 830                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 831                         break;
 832                 case OP_GETATTR:
 833                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 834                         break;
 835                 case OP_GETFH:
 836                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 837                         break;
 838                 case OP_LINK:
 839                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 840                         break;
 841                 case OP_LOCK:
 842                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
 843                         break;
 844                 case OP_LOCKT:
 845                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 846                         break;
 847                 case OP_LOCKU:
 848                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner);
 849                         break;
 850                 case OP_LOOKUP:
 851                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 852                         break;
 853                 case OP_LOOKUPP:
 854                         op->status = nfsd4_lookupp(rqstp, current_fh);
 855                         break;
 856                 case OP_NVERIFY:
 857                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 858                         if (op->status == nfserr_not_same)
 859                                 op->status = nfs_ok;
 860                         break;
 861                 case OP_OPEN:
 862                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner);
 863                         break;
 864                 case OP_OPEN_CONFIRM:
 865                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
 866                         break;
 867                 case OP_OPEN_DOWNGRADE:
 868                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
 869                         break;
 870                 case OP_PUTFH:
 871                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 872                         break;
 873                 case OP_PUTROOTFH:
 874                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 875                         break;
 876                 case OP_READ:
 877                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 878                         break;
 879                 case OP_READDIR:
 880                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 881                         break;
 882                 case OP_READLINK:
 883                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 884                         break;
 885                 case OP_REMOVE:
 886                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 887                         break;
 888                 case OP_RENAME:
 889                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 890                         break;
 891                 case OP_RENEW:
 892                         op->status = nfsd4_renew(&op->u.renew);
 893                         break;
 894                 case OP_RESTOREFH:
 895                         op->status = nfsd4_restorefh(current_fh, save_fh);
 896                         break;
 897                 case OP_SAVEFH:
 898                         op->status = nfsd4_savefh(current_fh, save_fh);
 899                         break;
 900                 case OP_SETATTR:
 901                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 902                         break;
 903                 case OP_SETCLIENTID:
 904                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 905                         break;
 906                 case OP_SETCLIENTID_CONFIRM:
 907                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 908                         break;
 909                 case OP_VERIFY:
 910                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 911                         if (op->status == nfserr_same)
 912                                 op->status = nfs_ok;
 913                         break;
 914                 case OP_WRITE:
 915                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 916                         break;
 917                 case OP_RELEASE_LOCKOWNER:
 918                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 919                         break;
 920                 default:
 921                         BUG_ON(op->status == nfs_ok);
 922                         break;
 923                 }
 924
 925 encode_op:
 926                 if (op->status == NFSERR_REPLAY_ME) {
 927                         op->replay = &replay_owner->so_replay;
 928                         nfsd4_encode_replay(resp, op);
 929                         status = op->status = op->replay->rp_status;
 930                 } else {
 931                         nfsd4_encode_operation(resp, op);
 932                         status = op->status;
 933                 }
 934                 if (replay_owner && (replay_owner != (void *)(-1))) {
 935                         nfs4_put_stateowner(replay_owner);
 936                         replay_owner = NULL;
 937                 }
 938                 /* XXX Ugh, we need to get rid of this kind of special case: */
 939                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 940                         fput(op->u.read.rd_filp);
 941         }
 942
 943 out:
 944         nfsd4_release_compoundargs(args);
 945         if (current_fh)
 946                 fh_put(current_fh);
 947         kfree(current_fh);
 948         if (save_fh)
 949                 fh_put(save_fh);
 950         kfree(save_fh);
 951         return status;
 952 }
 953
 954 #define nfs4svc_decode_voidargs         NULL
 955 #define nfs4svc_release_void            NULL
 956 #define nfsd4_voidres                   nfsd4_voidargs
 957 #define nfs4svc_release_compound        NULL
 958 struct nfsd4_voidargs { int dummy; };
 959
 960 #define PROC(name, argt, rest, relt, cache, respsize)   \
 961  { (svc_procfunc) nfsd4_proc_##name,            \
 962    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 963    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 964    (kxdrproc_t) nfs4svc_release_##relt,         \
 965    sizeof(struct nfsd4_##argt##args),           \
 966    sizeof(struct nfsd4_##rest##res),            \
 967    0,                                           \
 968    cache,                                       \
 969    respsize,                                    \
 970  }
 971
 972 /*
 973  * TODO: At the present time, the NFSv4 server does not do XID caching
 974  * of requests.  Implementing XID caching would not be a serious problem,
 975  * although it would require a mild change in interfaces since one
 976  * doesn't know whether an NFSv4 request is idempotent until after the
 977  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 978  * Astrand's regression testsuite for NFSv4 servers), which reuses
 979  * XID's liberally, so I've left it unimplemented until pynfs generates
 980  * better XID's.
 981  */
 982 static struct svc_procedure             nfsd_procedures4[2] = {
 983   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 984   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE)
 985 };
 986
 987 struct svc_version      nfsd_version4 = {
 988                 .vs_vers        = 4,
 989                 .vs_nproc       = 2,
 990                 .vs_proc        = nfsd_procedures4,
 991                 .vs_dispatch    = nfsd_dispatch,
 992                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
 993 };
 994
 995 /*
 996  * Local variables:
 997  *  c-basic-offset: 8
 998  * End:
 999  */