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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  * 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 __be32
  71 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
  72 {
  73         __be32 status;
  74
  75         if (open->op_truncate &&
  76                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
  77                 return nfserr_inval;
  78
  79         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
  80                 accmode |= MAY_READ;
  81         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
  82                 accmode |= (MAY_WRITE | MAY_TRUNC);
  83         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
  84                 accmode |= MAY_WRITE;
  85
  86         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
  87
  88         return status;
  89 }
  90
  91 static __be32
  92 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
  93 {
  94         struct svc_fh resfh;
  95         __be32 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         } else {
 110                 status = nfsd_lookup(rqstp, current_fh,
 111                                      open->op_fname.data, open->op_fname.len, &resfh);
 112                 fh_unlock(current_fh);
 113         }
 114         if (status)
 115                 goto out;
 116
 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 = resfh.fh_handle.fh_size;
 122         memcpy(open->op_stateowner->so_replay.rp_openfh,
 123                         &resfh.fh_handle.fh_base, resfh.fh_handle.fh_size);
 124
 125         status = do_open_permission(rqstp, current_fh, open, MAY_NOP);
 126
 127 out:
 128         fh_put(&resfh);
 129         return status;
 130 }
 131
 132 static __be32
 133 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 134 {
 135         __be32 status;
 136
 137         /* Only reclaims from previously confirmed clients are valid */
 138         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 139                 return status;
 140
 141         /* We don't know the target directory, and therefore can not
 142         * set the change info
 143         */
 144
 145         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 146
 147         /* set replay cache */
 148         open->op_stateowner->so_replay.rp_openfh_len = current_fh->fh_handle.fh_size;
 149         memcpy(open->op_stateowner->so_replay.rp_openfh,
 150                 &current_fh->fh_handle.fh_base,
 151                 current_fh->fh_handle.fh_size);
 152
 153         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 154                 (open->op_iattr.ia_size == 0);
 155
 156         status = do_open_permission(rqstp, current_fh, open, MAY_OWNER_OVERRIDE);
 157
 158         return status;
 159 }
 160
 161
 162 static inline __be32
 163 nfsd4_open(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, struct nfs4_stateowner **replay_owner)
 164 {
 165         __be32 status;
 166         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 167                 (int)open->op_fname.len, open->op_fname.data,
 168                 open->op_stateowner);
 169
 170         /* This check required by spec. */
 171         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 172                 return nfserr_inval;
 173
 174         nfs4_lock_state();
 175
 176         /* check seqid for replay. set nfs4_owner */
 177         status = nfsd4_process_open1(open);
 178         if (status == nfserr_replay_me) {
 179                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 180                 fh_put(current_fh);
 181                 current_fh->fh_handle.fh_size = rp->rp_openfh_len;
 182                 memcpy(&current_fh->fh_handle.fh_base, rp->rp_openfh,
 183                                 rp->rp_openfh_len);
 184                 status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 185                 if (status)
 186                         dprintk("nfsd4_open: replay failed"
 187                                 " restoring previous filehandle\n");
 188                 else
 189                         status = nfserr_replay_me;
 190         }
 191         if (status)
 192                 goto out;
 193
 194         /* Openowner is now set, so sequence id will get bumped.  Now we need
 195          * these checks before we do any creates: */
 196         status = nfserr_grace;
 197         if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 198                 goto out;
 199         status = nfserr_no_grace;
 200         if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 201                 goto out;
 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 __be32
 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 __be32
 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 __be32
 282 nfsd4_putrootfh(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 283 {
 284         __be32 status;
 285
 286         fh_put(current_fh);
 287         status = exp_pseudoroot(rqstp->rq_client, current_fh,
 288                               &rqstp->rq_chandle);
 289         return status;
 290 }
 291
 292 static inline __be32
 293 nfsd4_restorefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 294 {
 295         if (!save_fh->fh_dentry)
 296                 return nfserr_restorefh;
 297
 298         fh_dup2(current_fh, save_fh);
 299         return nfs_ok;
 300 }
 301
 302 static inline __be32
 303 nfsd4_savefh(struct svc_fh *current_fh, struct svc_fh *save_fh)
 304 {
 305         if (!current_fh->fh_dentry)
 306                 return nfserr_nofilehandle;
 307
 308         fh_dup2(save_fh, current_fh);
 309         return nfs_ok;
 310 }
 311
 312 /*
 313  * misc nfsv4 ops
 314  */
 315 static inline __be32
 316 nfsd4_access(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_access *access)
 317 {
 318         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 319                 return nfserr_inval;
 320
 321         access->ac_resp_access = access->ac_req_access;
 322         return nfsd_access(rqstp, current_fh, &access->ac_resp_access, &access->ac_supported);
 323 }
 324
 325 static inline __be32
 326 nfsd4_commit(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_commit *commit)
 327 {
 328         __be32 status;
 329
 330         u32 *p = (u32 *)commit->co_verf.data;
 331         *p++ = nfssvc_boot.tv_sec;
 332         *p++ = nfssvc_boot.tv_usec;
 333
 334         status = nfsd_commit(rqstp, current_fh, commit->co_offset, commit->co_count);
 335         if (status == nfserr_symlink)
 336                 status = nfserr_inval;
 337         return status;
 338 }
 339
 340 static __be32
 341 nfsd4_create(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_create *create)
 342 {
 343         struct svc_fh resfh;
 344         __be32 status;
 345         dev_t rdev;
 346
 347         fh_init(&resfh, NFS4_FHSIZE);
 348
 349         status = fh_verify(rqstp, current_fh, S_IFDIR, MAY_CREATE);
 350         if (status == nfserr_symlink)
 351                 status = nfserr_notdir;
 352         if (status)
 353                 return status;
 354
 355         switch (create->cr_type) {
 356         case NF4LNK:
 357                 /* ugh! we have to null-terminate the linktext, or
 358                  * vfs_symlink() will choke.  it is always safe to
 359                  * null-terminate by brute force, since at worst we
 360                  * will overwrite the first byte of the create namelen
 361                  * in the XDR buffer, which has already been extracted
 362                  * during XDR decode.
 363                  */
 364                 create->cr_linkname[create->cr_linklen] = 0;
 365
 366                 status = nfsd_symlink(rqstp, current_fh, create->cr_name,
 367                                       create->cr_namelen, create->cr_linkname,
 368                                       create->cr_linklen, &resfh, &create->cr_iattr);
 369                 break;
 370
 371         case NF4BLK:
 372                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 373                 if (MAJOR(rdev) != create->cr_specdata1 ||
 374                     MINOR(rdev) != create->cr_specdata2)
 375                         return nfserr_inval;
 376                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 377                                      create->cr_namelen, &create->cr_iattr,
 378                                      S_IFBLK, rdev, &resfh);
 379                 break;
 380
 381         case NF4CHR:
 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, current_fh, create->cr_name,
 387                                      create->cr_namelen, &create->cr_iattr,
 388                                      S_IFCHR, rdev, &resfh);
 389                 break;
 390
 391         case NF4SOCK:
 392                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 393                                      create->cr_namelen, &create->cr_iattr,
 394                                      S_IFSOCK, 0, &resfh);
 395                 break;
 396
 397         case NF4FIFO:
 398                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 399                                      create->cr_namelen, &create->cr_iattr,
 400                                      S_IFIFO, 0, &resfh);
 401                 break;
 402
 403         case NF4DIR:
 404                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 405                 status = nfsd_create(rqstp, current_fh, create->cr_name,
 406                                      create->cr_namelen, &create->cr_iattr,
 407                                      S_IFDIR, 0, &resfh);
 408                 break;
 409
 410         default:
 411                 status = nfserr_badtype;
 412         }
 413
 414         if (!status) {
 415                 fh_unlock(current_fh);
 416                 set_change_info(&create->cr_cinfo, current_fh);
 417                 fh_dup2(current_fh, &resfh);
 418         }
 419
 420         fh_put(&resfh);
 421         return status;
 422 }
 423
 424 static inline __be32
 425 nfsd4_getattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_getattr *getattr)
 426 {
 427         __be32 status;
 428
 429         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 430         if (status)
 431                 return status;
 432
 433         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 434                 return nfserr_inval;
 435
 436         getattr->ga_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 437         getattr->ga_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 438
 439         getattr->ga_fhp = current_fh;
 440         return nfs_ok;
 441 }
 442
 443 static inline __be32
 444 nfsd4_link(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 445            struct svc_fh *save_fh, struct nfsd4_link *link)
 446 {
 447         __be32 status = nfserr_nofilehandle;
 448
 449         if (!save_fh->fh_dentry)
 450                 return status;
 451         status = nfsd_link(rqstp, current_fh, link->li_name, link->li_namelen, save_fh);
 452         if (!status)
 453                 set_change_info(&link->li_cinfo, current_fh);
 454         return status;
 455 }
 456
 457 static __be32
 458 nfsd4_lookupp(struct svc_rqst *rqstp, struct svc_fh *current_fh)
 459 {
 460         struct svc_fh tmp_fh;
 461         __be32 ret;
 462
 463         fh_init(&tmp_fh, NFS4_FHSIZE);
 464         if((ret = exp_pseudoroot(rqstp->rq_client, &tmp_fh,
 465                               &rqstp->rq_chandle)) != 0)
 466                 return ret;
 467         if (tmp_fh.fh_dentry == current_fh->fh_dentry) {
 468                 fh_put(&tmp_fh);
 469                 return nfserr_noent;
 470         }
 471         fh_put(&tmp_fh);
 472         return nfsd_lookup(rqstp, current_fh, "..", 2, current_fh);
 473 }
 474
 475 static inline __be32
 476 nfsd4_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lookup *lookup)
 477 {
 478         return nfsd_lookup(rqstp, current_fh, lookup->lo_name, lookup->lo_len, current_fh);
 479 }
 480
 481 static inline __be32
 482 nfsd4_read(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_read *read)
 483 {
 484         __be32 status;
 485
 486         /* no need to check permission - this will be done in nfsd_read() */
 487
 488         read->rd_filp = NULL;
 489         if (read->rd_offset >= OFFSET_MAX)
 490                 return nfserr_inval;
 491
 492         nfs4_lock_state();
 493         /* check stateid */
 494         if ((status = nfs4_preprocess_stateid_op(current_fh, &read->rd_stateid,
 495                                 CHECK_FH | RD_STATE, &read->rd_filp))) {
 496                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 497                 goto out;
 498         }
 499         if (read->rd_filp)
 500                 get_file(read->rd_filp);
 501         status = nfs_ok;
 502 out:
 503         nfs4_unlock_state();
 504         read->rd_rqstp = rqstp;
 505         read->rd_fhp = current_fh;
 506         return status;
 507 }
 508
 509 static inline __be32
 510 nfsd4_readdir(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readdir *readdir)
 511 {
 512         u64 cookie = readdir->rd_cookie;
 513         static const nfs4_verifier zeroverf;
 514
 515         /* no need to check permission - this will be done in nfsd_readdir() */
 516
 517         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 518                 return nfserr_inval;
 519
 520         readdir->rd_bmval[0] &= NFSD_SUPPORTED_ATTRS_WORD0;
 521         readdir->rd_bmval[1] &= NFSD_SUPPORTED_ATTRS_WORD1;
 522
 523         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 524             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 525                 return nfserr_bad_cookie;
 526
 527         readdir->rd_rqstp = rqstp;
 528         readdir->rd_fhp = current_fh;
 529         return nfs_ok;
 530 }
 531
 532 static inline __be32
 533 nfsd4_readlink(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_readlink *readlink)
 534 {
 535         readlink->rl_rqstp = rqstp;
 536         readlink->rl_fhp = current_fh;
 537         return nfs_ok;
 538 }
 539
 540 static inline __be32
 541 nfsd4_remove(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_remove *remove)
 542 {
 543         __be32 status;
 544
 545         if (nfs4_in_grace())
 546                 return nfserr_grace;
 547         status = nfsd_unlink(rqstp, current_fh, 0, remove->rm_name, remove->rm_namelen);
 548         if (status == nfserr_symlink)
 549                 return nfserr_notdir;
 550         if (!status) {
 551                 fh_unlock(current_fh);
 552                 set_change_info(&remove->rm_cinfo, current_fh);
 553         }
 554         return status;
 555 }
 556
 557 static inline __be32
 558 nfsd4_rename(struct svc_rqst *rqstp, struct svc_fh *current_fh,
 559              struct svc_fh *save_fh, struct nfsd4_rename *rename)
 560 {
 561         __be32 status = nfserr_nofilehandle;
 562
 563         if (!save_fh->fh_dentry)
 564                 return status;
 565         if (nfs4_in_grace() && !(save_fh->fh_export->ex_flags
 566                                         & NFSEXP_NOSUBTREECHECK))
 567                 return nfserr_grace;
 568         status = nfsd_rename(rqstp, save_fh, rename->rn_sname,
 569                              rename->rn_snamelen, current_fh,
 570                              rename->rn_tname, rename->rn_tnamelen);
 571
 572         /* the underlying filesystem returns different error's than required
 573          * by NFSv4. both save_fh and current_fh have been verified.. */
 574         if (status == nfserr_isdir)
 575                 status = nfserr_exist;
 576         else if ((status == nfserr_notdir) &&
 577                   (S_ISDIR(save_fh->fh_dentry->d_inode->i_mode) &&
 578                    S_ISDIR(current_fh->fh_dentry->d_inode->i_mode)))
 579                 status = nfserr_exist;
 580         else if (status == nfserr_symlink)
 581                 status = nfserr_notdir;
 582
 583         if (!status) {
 584                 set_change_info(&rename->rn_sinfo, current_fh);
 585                 set_change_info(&rename->rn_tinfo, save_fh);
 586         }
 587         return status;
 588 }
 589
 590 static inline __be32
 591 nfsd4_setattr(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_setattr *setattr)
 592 {
 593         __be32 status = nfs_ok;
 594
 595         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 596                 nfs4_lock_state();
 597                 status = nfs4_preprocess_stateid_op(current_fh,
 598                         &setattr->sa_stateid, CHECK_FH | WR_STATE, NULL);
 599                 nfs4_unlock_state();
 600                 if (status) {
 601                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 602                         return status;
 603                 }
 604         }
 605         status = nfs_ok;
 606         if (setattr->sa_acl != NULL)
 607                 status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
 608         if (status)
 609                 return status;
 610         status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
 611                                 0, (time_t)0);
 612         return status;
 613 }
 614
 615 static inline __be32
 616 nfsd4_write(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_write *write)
 617 {
 618         stateid_t *stateid = &write->wr_stateid;
 619         struct file *filp = NULL;
 620         u32 *p;
 621         __be32 status = nfs_ok;
 622
 623         /* no need to check permission - this will be done in nfsd_write() */
 624
 625         if (write->wr_offset >= OFFSET_MAX)
 626                 return nfserr_inval;
 627
 628         nfs4_lock_state();
 629         status = nfs4_preprocess_stateid_op(current_fh, stateid,
 630                                         CHECK_FH | WR_STATE, &filp);
 631         if (filp)
 632                 get_file(filp);
 633         nfs4_unlock_state();
 634
 635         if (status) {
 636                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 637                 return status;
 638         }
 639
 640         write->wr_bytes_written = write->wr_buflen;
 641         write->wr_how_written = write->wr_stable_how;
 642         p = (u32 *)write->wr_verifier.data;
 643         *p++ = nfssvc_boot.tv_sec;
 644         *p++ = nfssvc_boot.tv_usec;
 645
 646         status =  nfsd_write(rqstp, current_fh, filp, write->wr_offset,
 647                         rqstp->rq_vec, write->wr_vlen, write->wr_buflen,
 648                         &write->wr_how_written);
 649         if (filp)
 650                 fput(filp);
 651
 652         if (status == nfserr_symlink)
 653                 status = nfserr_inval;
 654         return status;
 655 }
 656
 657 /* This routine never returns NFS_OK!  If there are no other errors, it
 658  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 659  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 660  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 661  */
 662 static __be32
 663 nfsd4_verify(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_verify *verify)
 664 {
 665         __be32 *buf, *p;
 666         int count;
 667         __be32 status;
 668
 669         status = fh_verify(rqstp, current_fh, 0, MAY_NOP);
 670         if (status)
 671                 return status;
 672
 673         if ((verify->ve_bmval[0] & ~NFSD_SUPPORTED_ATTRS_WORD0)
 674             || (verify->ve_bmval[1] & ~NFSD_SUPPORTED_ATTRS_WORD1))
 675                 return nfserr_attrnotsupp;
 676         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 677             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 678                 return nfserr_inval;
 679         if (verify->ve_attrlen & 3)
 680                 return nfserr_inval;
 681
 682         /* count in words:
 683          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 684          */
 685         count = 4 + (verify->ve_attrlen >> 2);
 686         buf = kmalloc(count << 2, GFP_KERNEL);
 687         if (!buf)
 688                 return nfserr_resource;
 689
 690         status = nfsd4_encode_fattr(current_fh, current_fh->fh_export,
 691                                     current_fh->fh_dentry, buf,
 692                                     &count, verify->ve_bmval,
 693                                     rqstp);
 694
 695         /* this means that nfsd4_encode_fattr() ran out of space */
 696         if (status == nfserr_resource && count == 0)
 697                 status = nfserr_not_same;
 698         if (status)
 699                 goto out_kfree;
 700
 701         p = buf + 3;
 702         status = nfserr_not_same;
 703         if (ntohl(*p++) != verify->ve_attrlen)
 704                 goto out_kfree;
 705         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 706                 status = nfserr_same;
 707
 708 out_kfree:
 709         kfree(buf);
 710         return status;
 711 }
 712
 713 /*
 714  * NULL call.
 715  */
 716 static __be32
 717 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 718 {
 719         return nfs_ok;
 720 }
 721
 722 static inline void nfsd4_increment_op_stats(u32 opnum)
 723 {
 724         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 725                 nfsdstats.nfs4_opcount[opnum]++;
 726 }
 727
 728
 729 /*
 730  * COMPOUND call.
 731  */
 732 static __be32
 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         __be32          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                 if (!current_fh->fh_dentry) {
 804                         if (!((op->opnum == OP_PUTFH) ||
 805                               (op->opnum == OP_PUTROOTFH) ||
 806                               (op->opnum == OP_SETCLIENTID) ||
 807                               (op->opnum == OP_SETCLIENTID_CONFIRM) ||
 808                               (op->opnum == OP_RENEW) ||
 809                               (op->opnum == OP_RESTOREFH) ||
 810                               (op->opnum == OP_RELEASE_LOCKOWNER))) {
 811                                 op->status = nfserr_nofilehandle;
 812                                 goto encode_op;
 813                         }
 814                 }
 815                 /* Check must be done at start of each operation, except
 816                  * for GETATTR and ops not listed as returning NFS4ERR_MOVED
 817                  */
 818                 else if (current_fh->fh_export->ex_fslocs.migrated &&
 819                          !((op->opnum == OP_GETATTR) ||
 820                            (op->opnum == OP_PUTROOTFH) ||
 821                            (op->opnum == OP_PUTPUBFH) ||
 822                            (op->opnum == OP_RENEW) ||
 823                            (op->opnum == OP_SETCLIENTID) ||
 824                            (op->opnum == OP_RELEASE_LOCKOWNER))) {
 825                         op->status = nfserr_moved;
 826                         goto encode_op;
 827                 }
 828                 switch (op->opnum) {
 829                 case OP_ACCESS:
 830                         op->status = nfsd4_access(rqstp, current_fh, &op->u.access);
 831                         break;
 832                 case OP_CLOSE:
 833                         op->status = nfsd4_close(rqstp, current_fh, &op->u.close, &replay_owner);
 834                         break;
 835                 case OP_COMMIT:
 836                         op->status = nfsd4_commit(rqstp, current_fh, &op->u.commit);
 837                         break;
 838                 case OP_CREATE:
 839                         op->status = nfsd4_create(rqstp, current_fh, &op->u.create);
 840                         break;
 841                 case OP_DELEGRETURN:
 842                         op->status = nfsd4_delegreturn(rqstp, current_fh, &op->u.delegreturn);
 843                         break;
 844                 case OP_GETATTR:
 845                         op->status = nfsd4_getattr(rqstp, current_fh, &op->u.getattr);
 846                         break;
 847                 case OP_GETFH:
 848                         op->status = nfsd4_getfh(current_fh, &op->u.getfh);
 849                         break;
 850                 case OP_LINK:
 851                         op->status = nfsd4_link(rqstp, current_fh, save_fh, &op->u.link);
 852                         break;
 853                 case OP_LOCK:
 854                         op->status = nfsd4_lock(rqstp, current_fh, &op->u.lock, &replay_owner);
 855                         break;
 856                 case OP_LOCKT:
 857                         op->status = nfsd4_lockt(rqstp, current_fh, &op->u.lockt);
 858                         break;
 859                 case OP_LOCKU:
 860                         op->status = nfsd4_locku(rqstp, current_fh, &op->u.locku, &replay_owner);
 861                         break;
 862                 case OP_LOOKUP:
 863                         op->status = nfsd4_lookup(rqstp, current_fh, &op->u.lookup);
 864                         break;
 865                 case OP_LOOKUPP:
 866                         op->status = nfsd4_lookupp(rqstp, current_fh);
 867                         break;
 868                 case OP_NVERIFY:
 869                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.nverify);
 870                         if (op->status == nfserr_not_same)
 871                                 op->status = nfs_ok;
 872                         break;
 873                 case OP_OPEN:
 874                         op->status = nfsd4_open(rqstp, current_fh, &op->u.open, &replay_owner);
 875                         break;
 876                 case OP_OPEN_CONFIRM:
 877                         op->status = nfsd4_open_confirm(rqstp, current_fh, &op->u.open_confirm, &replay_owner);
 878                         break;
 879                 case OP_OPEN_DOWNGRADE:
 880                         op->status = nfsd4_open_downgrade(rqstp, current_fh, &op->u.open_downgrade, &replay_owner);
 881                         break;
 882                 case OP_PUTFH:
 883                         op->status = nfsd4_putfh(rqstp, current_fh, &op->u.putfh);
 884                         break;
 885                 case OP_PUTROOTFH:
 886                         op->status = nfsd4_putrootfh(rqstp, current_fh);
 887                         break;
 888                 case OP_READ:
 889                         op->status = nfsd4_read(rqstp, current_fh, &op->u.read);
 890                         break;
 891                 case OP_READDIR:
 892                         op->status = nfsd4_readdir(rqstp, current_fh, &op->u.readdir);
 893                         break;
 894                 case OP_READLINK:
 895                         op->status = nfsd4_readlink(rqstp, current_fh, &op->u.readlink);
 896                         break;
 897                 case OP_REMOVE:
 898                         op->status = nfsd4_remove(rqstp, current_fh, &op->u.remove);
 899                         break;
 900                 case OP_RENAME:
 901                         op->status = nfsd4_rename(rqstp, current_fh, save_fh, &op->u.rename);
 902                         break;
 903                 case OP_RENEW:
 904                         op->status = nfsd4_renew(&op->u.renew);
 905                         break;
 906                 case OP_RESTOREFH:
 907                         op->status = nfsd4_restorefh(current_fh, save_fh);
 908                         break;
 909                 case OP_SAVEFH:
 910                         op->status = nfsd4_savefh(current_fh, save_fh);
 911                         break;
 912                 case OP_SETATTR:
 913                         op->status = nfsd4_setattr(rqstp, current_fh, &op->u.setattr);
 914                         break;
 915                 case OP_SETCLIENTID:
 916                         op->status = nfsd4_setclientid(rqstp, &op->u.setclientid);
 917                         break;
 918                 case OP_SETCLIENTID_CONFIRM:
 919                         op->status = nfsd4_setclientid_confirm(rqstp, &op->u.setclientid_confirm);
 920                         break;
 921                 case OP_VERIFY:
 922                         op->status = nfsd4_verify(rqstp, current_fh, &op->u.verify);
 923                         if (op->status == nfserr_same)
 924                                 op->status = nfs_ok;
 925                         break;
 926                 case OP_WRITE:
 927                         op->status = nfsd4_write(rqstp, current_fh, &op->u.write);
 928                         break;
 929                 case OP_RELEASE_LOCKOWNER:
 930                         op->status = nfsd4_release_lockowner(rqstp, &op->u.release_lockowner);
 931                         break;
 932                 default:
 933                         BUG_ON(op->status == nfs_ok);
 934                         break;
 935                 }
 936
 937 encode_op:
 938                 if (op->status == nfserr_replay_me) {
 939                         op->replay = &replay_owner->so_replay;
 940                         nfsd4_encode_replay(resp, op);
 941                         status = op->status = op->replay->rp_status;
 942                 } else {
 943                         nfsd4_encode_operation(resp, op);
 944                         status = op->status;
 945                 }
 946                 if (replay_owner && (replay_owner != (void *)(-1))) {
 947                         nfs4_put_stateowner(replay_owner);
 948                         replay_owner = NULL;
 949                 }
 950                 /* XXX Ugh, we need to get rid of this kind of special case: */
 951                 if (op->opnum == OP_READ && op->u.read.rd_filp)
 952                         fput(op->u.read.rd_filp);
 953
 954                 nfsd4_increment_op_stats(op->opnum);
 955         }
 956
 957 out:
 958         nfsd4_release_compoundargs(args);
 959         if (current_fh)
 960                 fh_put(current_fh);
 961         kfree(current_fh);
 962         if (save_fh)
 963                 fh_put(save_fh);
 964         kfree(save_fh);
 965         return status;
 966 }
 967
 968 #define nfs4svc_decode_voidargs         NULL
 969 #define nfs4svc_release_void            NULL
 970 #define nfsd4_voidres                   nfsd4_voidargs
 971 #define nfs4svc_release_compound        NULL
 972 struct nfsd4_voidargs { int dummy; };
 973
 974 #define PROC(name, argt, rest, relt, cache, respsize)   \
 975  { (svc_procfunc) nfsd4_proc_##name,            \
 976    (kxdrproc_t) nfs4svc_decode_##argt##args,    \
 977    (kxdrproc_t) nfs4svc_encode_##rest##res,     \
 978    (kxdrproc_t) nfs4svc_release_##relt,         \
 979    sizeof(struct nfsd4_##argt##args),           \
 980    sizeof(struct nfsd4_##rest##res),            \
 981    0,                                           \
 982    cache,                                       \
 983    respsize,                                    \
 984  }
 985
 986 /*
 987  * TODO: At the present time, the NFSv4 server does not do XID caching
 988  * of requests.  Implementing XID caching would not be a serious problem,
 989  * although it would require a mild change in interfaces since one
 990  * doesn't know whether an NFSv4 request is idempotent until after the
 991  * XDR decode.  However, XID caching totally confuses pynfs (Peter
 992  * Astrand's regression testsuite for NFSv4 servers), which reuses
 993  * XID's liberally, so I've left it unimplemented until pynfs generates
 994  * better XID's.
 995  */
 996 static struct svc_procedure             nfsd_procedures4[2] = {
 997   PROC(null,     void,          void,           void,     RC_NOCACHE, 1),
 998   PROC(compound, compound,      compound,       compound, RC_NOCACHE, NFSD_BUFSIZE/4)
 999 };
1000
1001 struct svc_version      nfsd_version4 = {
1002                 .vs_vers        = 4,
1003                 .vs_nproc       = 2,
1004                 .vs_proc        = nfsd_procedures4,
1005                 .vs_dispatch    = nfsd_dispatch,
1006                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1007 };
1008
1009 /*
1010  * Local variables:
1011  *  c-basic-offset: 8
1012  * End:
1013  */