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   1 /*
   2  *  fs/nfsd/nfs4proc.c
   3  *
   4  *  Server-side procedures for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/param.h>
  39 #include <linux/major.h>
  40 #include <linux/slab.h>
  41 #include <linux/file.h>
  42
  43 #include <linux/sunrpc/svc.h>
  44 #include <linux/nfsd/nfsd.h>
  45 #include <linux/nfsd/cache.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfsd/state.h>
  48 #include <linux/nfsd/xdr4.h>
  49 #include <linux/nfs4_acl.h>
  50 #include <linux/sunrpc/gss_api.h>
  51
  52 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  53
  54 static u32 nfsd_attrmask[] = {
  55         NFSD_WRITEABLE_ATTRS_WORD0,
  56         NFSD_WRITEABLE_ATTRS_WORD1,
  57         NFSD_WRITEABLE_ATTRS_WORD2
  58 };
  59
  60 static u32 nfsd41_ex_attrmask[] = {
  61         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  62         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  63         NFSD_SUPPATTR_EXCLCREAT_WORD2
  64 };
  65
  66 static __be32
  67 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  68                    u32 *bmval, u32 *writable)
  69 {
  70         struct dentry *dentry = cstate->current_fh.fh_dentry;
  71
  72         /*
  73          * Check about attributes are supported by the NFSv4 server or not.
  74          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  75          */
  76         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  77             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  78             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  79                 return nfserr_attrnotsupp;
  80
  81         /*
  82          * Check FATTR4_WORD0_ACL can be supported
  83          * in current environment or not.
  84          */
  85         if (bmval[0] & FATTR4_WORD0_ACL) {
  86                 if (!IS_POSIXACL(dentry->d_inode))
  87                         return nfserr_attrnotsupp;
  88         }
  89
  90         /*
  91          * According to spec, read-only attributes return ERR_INVAL.
  92          */
  93         if (writable) {
  94                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  95                     (bmval[2] & ~writable[2]))
  96                         return nfserr_inval;
  97         }
  98
  99         return nfs_ok;
 100 }
 101
 102 static __be32
 103 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 104         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 105 {
 106         __be32 status = nfs_ok;
 107
 108         if (open->op_create == NFS4_OPEN_CREATE) {
 109                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 110                     || open->op_createmode == NFS4_CREATE_GUARDED)
 111                         status = check_attr_support(rqstp, cstate,
 112                                         open->op_bmval, nfsd_attrmask);
 113                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 114                         status = check_attr_support(rqstp, cstate,
 115                                         open->op_bmval, nfsd41_ex_attrmask);
 116         }
 117
 118         return status;
 119 }
 120
 121 static int
 122 is_create_with_attrs(struct nfsd4_open *open)
 123 {
 124         return open->op_create == NFS4_OPEN_CREATE
 125                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 126                     || open->op_createmode == NFS4_CREATE_GUARDED
 127                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 128 }
 129
 130 /*
 131  * if error occurs when setting the acl, just clear the acl bit
 132  * in the returned attr bitmap.
 133  */
 134 static void
 135 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 136                 struct nfs4_acl *acl, u32 *bmval)
 137 {
 138         __be32 status;
 139
 140         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 141         if (status)
 142                 /*
 143                  * We should probably fail the whole open at this point,
 144                  * but we've already created the file, so it's too late;
 145                  * So this seems the least of evils:
 146                  */
 147                 bmval[0] &= ~FATTR4_WORD0_ACL;
 148 }
 149
 150 static inline void
 151 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 152 {
 153         fh_put(dst);
 154         dget(src->fh_dentry);
 155         if (src->fh_export)
 156                 cache_get(&src->fh_export->h);
 157         *dst = *src;
 158 }
 159
 160 static __be32
 161 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 162 {
 163         __be32 status;
 164
 165         if (open->op_truncate &&
 166                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 167                 return nfserr_inval;
 168
 169         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 170                 accmode |= NFSD_MAY_READ;
 171         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 172                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 173         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
 174                 accmode |= NFSD_MAY_WRITE;
 175
 176         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 177
 178         return status;
 179 }
 180
 181 static __be32
 182 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 183 {
 184         struct svc_fh resfh;
 185         __be32 status;
 186         int created = 0;
 187
 188         fh_init(&resfh, NFS4_FHSIZE);
 189         open->op_truncate = 0;
 190
 191         if (open->op_create) {
 192                 /* FIXME: check session persistence and pnfs flags.
 193                  * The nfsv4.1 spec requires the following semantics:
 194                  *
 195                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 196                  * Reply Cache  | server |                 |
 197                  * -------------+--------+-----------------+--------------------
 198                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 199                  *              |        |                 | (SHOULD)
 200                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 201                  *              |        |                 | (SHOULD NOT)
 202                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 203                  * yes          | no     | GUARDED4        | GUARDED4
 204                  * yes          | yes    | GUARDED4        | GUARDED4
 205                  */
 206
 207                 /*
 208                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 209                  * in NFSv4 as in v3.
 210                  */
 211                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 212                                         open->op_fname.len, &open->op_iattr,
 213                                         &resfh, open->op_createmode,
 214                                         (u32 *)open->op_verf.data,
 215                                         &open->op_truncate, &created);
 216
 217                 /*
 218                  * Following rfc 3530 14.2.16, use the returned bitmask
 219                  * to indicate which attributes we used to store the
 220                  * verifier:
 221                  */
 222                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 223                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 224                                                 FATTR4_WORD1_TIME_MODIFY);
 225         } else {
 226                 status = nfsd_lookup(rqstp, current_fh,
 227                                      open->op_fname.data, open->op_fname.len, &resfh);
 228                 fh_unlock(current_fh);
 229         }
 230         if (status)
 231                 goto out;
 232
 233         if (is_create_with_attrs(open) && open->op_acl != NULL)
 234                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 235
 236         set_change_info(&open->op_cinfo, current_fh);
 237         fh_dup2(current_fh, &resfh);
 238
 239         /* set reply cache */
 240         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 241                         &resfh.fh_handle);
 242         if (!created)
 243                 status = do_open_permission(rqstp, current_fh, open,
 244                                             NFSD_MAY_NOP);
 245
 246 out:
 247         fh_put(&resfh);
 248         return status;
 249 }
 250
 251 static __be32
 252 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 253 {
 254         __be32 status;
 255
 256         /* Only reclaims from previously confirmed clients are valid */
 257         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 258                 return status;
 259
 260         /* We don't know the target directory, and therefore can not
 261         * set the change info
 262         */
 263
 264         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 265
 266         /* set replay cache */
 267         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 268                         &current_fh->fh_handle);
 269
 270         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 271                 (open->op_iattr.ia_size == 0);
 272
 273         status = do_open_permission(rqstp, current_fh, open,
 274                                     NFSD_MAY_OWNER_OVERRIDE);
 275
 276         return status;
 277 }
 278
 279 static void
 280 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 281 {
 282         struct nfsd4_sessionid *sid =
 283                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 284
 285         clid->cl_boot = sid->clientid.cl_boot;
 286         clid->cl_id = sid->clientid.cl_id;
 287 }
 288
 289 static __be32
 290 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 291            struct nfsd4_open *open)
 292 {
 293         __be32 status;
 294         struct nfsd4_compoundres *resp;
 295
 296         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 297                 (int)open->op_fname.len, open->op_fname.data,
 298                 open->op_stateowner);
 299
 300         /* This check required by spec. */
 301         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 302                 return nfserr_inval;
 303
 304         if (nfsd4_has_session(cstate))
 305                 copy_clientid(&open->op_clientid, cstate->session);
 306
 307         nfs4_lock_state();
 308
 309         /* check seqid for replay. set nfs4_owner */
 310         resp = rqstp->rq_resp;
 311         status = nfsd4_process_open1(&resp->cstate, open);
 312         if (status == nfserr_replay_me) {
 313                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 314                 fh_put(&cstate->current_fh);
 315                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 316                                 &rp->rp_openfh);
 317                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 318                 if (status)
 319                         dprintk("nfsd4_open: replay failed"
 320                                 " restoring previous filehandle\n");
 321                 else
 322                         status = nfserr_replay_me;
 323         }
 324         if (status)
 325                 goto out;
 326
 327         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 328         if (status)
 329                 goto out;
 330
 331         /* Openowner is now set, so sequence id will get bumped.  Now we need
 332          * these checks before we do any creates: */
 333         status = nfserr_grace;
 334         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 335                 goto out;
 336         status = nfserr_no_grace;
 337         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 338                 goto out;
 339
 340         switch (open->op_claim_type) {
 341                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 342                 case NFS4_OPEN_CLAIM_NULL:
 343                         /*
 344                          * (1) set CURRENT_FH to the file being opened,
 345                          * creating it if necessary, (2) set open->op_cinfo,
 346                          * (3) set open->op_truncate if the file is to be
 347                          * truncated after opening, (4) do permission checking.
 348                          */
 349                         status = do_open_lookup(rqstp, &cstate->current_fh,
 350                                                 open);
 351                         if (status)
 352                                 goto out;
 353                         break;
 354                 case NFS4_OPEN_CLAIM_PREVIOUS:
 355                         open->op_stateowner->so_confirmed = 1;
 356                         /*
 357                          * The CURRENT_FH is already set to the file being
 358                          * opened.  (1) set open->op_cinfo, (2) set
 359                          * open->op_truncate if the file is to be truncated
 360                          * after opening, (3) do permission checking.
 361                         */
 362                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 363                                                  open);
 364                         if (status)
 365                                 goto out;
 366                         break;
 367                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 368                         open->op_stateowner->so_confirmed = 1;
 369                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 370                                 open->op_claim_type);
 371                         status = nfserr_notsupp;
 372                         goto out;
 373                 default:
 374                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 375                                 open->op_claim_type);
 376                         status = nfserr_inval;
 377                         goto out;
 378         }
 379         /*
 380          * nfsd4_process_open2() does the actual opening of the file.  If
 381          * successful, it (1) truncates the file if open->op_truncate was
 382          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 383          */
 384         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 385 out:
 386         if (open->op_stateowner) {
 387                 nfs4_get_stateowner(open->op_stateowner);
 388                 cstate->replay_owner = open->op_stateowner;
 389         }
 390         nfs4_unlock_state();
 391         return status;
 392 }
 393
 394 /*
 395  * filehandle-manipulating ops.
 396  */
 397 static __be32
 398 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 399             struct svc_fh **getfh)
 400 {
 401         if (!cstate->current_fh.fh_dentry)
 402                 return nfserr_nofilehandle;
 403
 404         *getfh = &cstate->current_fh;
 405         return nfs_ok;
 406 }
 407
 408 static __be32
 409 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 410             struct nfsd4_putfh *putfh)
 411 {
 412         fh_put(&cstate->current_fh);
 413         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 414         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 415                putfh->pf_fhlen);
 416         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 417 }
 418
 419 static __be32
 420 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 421                 void *arg)
 422 {
 423         __be32 status;
 424
 425         fh_put(&cstate->current_fh);
 426         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 427         return status;
 428 }
 429
 430 static __be32
 431 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 432                 void *arg)
 433 {
 434         if (!cstate->save_fh.fh_dentry)
 435                 return nfserr_restorefh;
 436
 437         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 438         return nfs_ok;
 439 }
 440
 441 static __be32
 442 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 443              void *arg)
 444 {
 445         if (!cstate->current_fh.fh_dentry)
 446                 return nfserr_nofilehandle;
 447
 448         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 449         return nfs_ok;
 450 }
 451
 452 /*
 453  * misc nfsv4 ops
 454  */
 455 static __be32
 456 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 457              struct nfsd4_access *access)
 458 {
 459         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 460                 return nfserr_inval;
 461
 462         access->ac_resp_access = access->ac_req_access;
 463         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 464                            &access->ac_supported);
 465 }
 466
 467 static __be32
 468 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 469              struct nfsd4_commit *commit)
 470 {
 471         __be32 status;
 472
 473         u32 *p = (u32 *)commit->co_verf.data;
 474         *p++ = nfssvc_boot.tv_sec;
 475         *p++ = nfssvc_boot.tv_usec;
 476
 477         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 478                              commit->co_count);
 479         if (status == nfserr_symlink)
 480                 status = nfserr_inval;
 481         return status;
 482 }
 483
 484 static __be32
 485 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 486              struct nfsd4_create *create)
 487 {
 488         struct svc_fh resfh;
 489         __be32 status;
 490         dev_t rdev;
 491
 492         fh_init(&resfh, NFS4_FHSIZE);
 493
 494         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 495                            NFSD_MAY_CREATE);
 496         if (status == nfserr_symlink)
 497                 status = nfserr_notdir;
 498         if (status)
 499                 return status;
 500
 501         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 502                                     nfsd_attrmask);
 503         if (status)
 504                 return status;
 505
 506         switch (create->cr_type) {
 507         case NF4LNK:
 508                 /* ugh! we have to null-terminate the linktext, or
 509                  * vfs_symlink() will choke.  it is always safe to
 510                  * null-terminate by brute force, since at worst we
 511                  * will overwrite the first byte of the create namelen
 512                  * in the XDR buffer, which has already been extracted
 513                  * during XDR decode.
 514                  */
 515                 create->cr_linkname[create->cr_linklen] = 0;
 516
 517                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 518                                       create->cr_name, create->cr_namelen,
 519                                       create->cr_linkname, create->cr_linklen,
 520                                       &resfh, &create->cr_iattr);
 521                 break;
 522
 523         case NF4BLK:
 524                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 525                 if (MAJOR(rdev) != create->cr_specdata1 ||
 526                     MINOR(rdev) != create->cr_specdata2)
 527                         return nfserr_inval;
 528                 status = nfsd_create(rqstp, &cstate->current_fh,
 529                                      create->cr_name, create->cr_namelen,
 530                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 531                 break;
 532
 533         case NF4CHR:
 534                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 535                 if (MAJOR(rdev) != create->cr_specdata1 ||
 536                     MINOR(rdev) != create->cr_specdata2)
 537                         return nfserr_inval;
 538                 status = nfsd_create(rqstp, &cstate->current_fh,
 539                                      create->cr_name, create->cr_namelen,
 540                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 541                 break;
 542
 543         case NF4SOCK:
 544                 status = nfsd_create(rqstp, &cstate->current_fh,
 545                                      create->cr_name, create->cr_namelen,
 546                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 547                 break;
 548
 549         case NF4FIFO:
 550                 status = nfsd_create(rqstp, &cstate->current_fh,
 551                                      create->cr_name, create->cr_namelen,
 552                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 553                 break;
 554
 555         case NF4DIR:
 556                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 557                 status = nfsd_create(rqstp, &cstate->current_fh,
 558                                      create->cr_name, create->cr_namelen,
 559                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 560                 break;
 561
 562         default:
 563                 status = nfserr_badtype;
 564         }
 565
 566         if (status)
 567                 goto out;
 568
 569         if (create->cr_acl != NULL)
 570                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 571                                 create->cr_bmval);
 572
 573         fh_unlock(&cstate->current_fh);
 574         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 575         fh_dup2(&cstate->current_fh, &resfh);
 576 out:
 577         fh_put(&resfh);
 578         return status;
 579 }
 580
 581 static __be32
 582 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 583               struct nfsd4_getattr *getattr)
 584 {
 585         __be32 status;
 586
 587         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 588         if (status)
 589                 return status;
 590
 591         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 592                 return nfserr_inval;
 593
 594         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 595         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 596         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 597
 598         getattr->ga_fhp = &cstate->current_fh;
 599         return nfs_ok;
 600 }
 601
 602 static __be32
 603 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 604            struct nfsd4_link *link)
 605 {
 606         __be32 status = nfserr_nofilehandle;
 607
 608         if (!cstate->save_fh.fh_dentry)
 609                 return status;
 610         status = nfsd_link(rqstp, &cstate->current_fh,
 611                            link->li_name, link->li_namelen, &cstate->save_fh);
 612         if (!status)
 613                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 614         return status;
 615 }
 616
 617 static __be32
 618 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 619               void *arg)
 620 {
 621         struct svc_fh tmp_fh;
 622         __be32 ret;
 623
 624         fh_init(&tmp_fh, NFS4_FHSIZE);
 625         ret = exp_pseudoroot(rqstp, &tmp_fh);
 626         if (ret)
 627                 return ret;
 628         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 629                 fh_put(&tmp_fh);
 630                 return nfserr_noent;
 631         }
 632         fh_put(&tmp_fh);
 633         return nfsd_lookup(rqstp, &cstate->current_fh,
 634                            "..", 2, &cstate->current_fh);
 635 }
 636
 637 static __be32
 638 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 639              struct nfsd4_lookup *lookup)
 640 {
 641         return nfsd_lookup(rqstp, &cstate->current_fh,
 642                            lookup->lo_name, lookup->lo_len,
 643                            &cstate->current_fh);
 644 }
 645
 646 static __be32
 647 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 648            struct nfsd4_read *read)
 649 {
 650         __be32 status;
 651
 652         /* no need to check permission - this will be done in nfsd_read() */
 653
 654         read->rd_filp = NULL;
 655         if (read->rd_offset >= OFFSET_MAX)
 656                 return nfserr_inval;
 657
 658         nfs4_lock_state();
 659         /* check stateid */
 660         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 661                                                  RD_STATE, &read->rd_filp))) {
 662                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 663                 goto out;
 664         }
 665         if (read->rd_filp)
 666                 get_file(read->rd_filp);
 667         status = nfs_ok;
 668 out:
 669         nfs4_unlock_state();
 670         read->rd_rqstp = rqstp;
 671         read->rd_fhp = &cstate->current_fh;
 672         return status;
 673 }
 674
 675 static __be32
 676 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 677               struct nfsd4_readdir *readdir)
 678 {
 679         u64 cookie = readdir->rd_cookie;
 680         static const nfs4_verifier zeroverf;
 681
 682         /* no need to check permission - this will be done in nfsd_readdir() */
 683
 684         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 685                 return nfserr_inval;
 686
 687         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 688         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 689         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 690
 691         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 692             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 693                 return nfserr_bad_cookie;
 694
 695         readdir->rd_rqstp = rqstp;
 696         readdir->rd_fhp = &cstate->current_fh;
 697         return nfs_ok;
 698 }
 699
 700 static __be32
 701 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 702                struct nfsd4_readlink *readlink)
 703 {
 704         readlink->rl_rqstp = rqstp;
 705         readlink->rl_fhp = &cstate->current_fh;
 706         return nfs_ok;
 707 }
 708
 709 static __be32
 710 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 711              struct nfsd4_remove *remove)
 712 {
 713         __be32 status;
 714
 715         if (locks_in_grace())
 716                 return nfserr_grace;
 717         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 718                              remove->rm_name, remove->rm_namelen);
 719         if (status == nfserr_symlink)
 720                 return nfserr_notdir;
 721         if (!status) {
 722                 fh_unlock(&cstate->current_fh);
 723                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 724         }
 725         return status;
 726 }
 727
 728 static __be32
 729 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 730              struct nfsd4_rename *rename)
 731 {
 732         __be32 status = nfserr_nofilehandle;
 733
 734         if (!cstate->save_fh.fh_dentry)
 735                 return status;
 736         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 737                                         & NFSEXP_NOSUBTREECHECK))
 738                 return nfserr_grace;
 739         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 740                              rename->rn_snamelen, &cstate->current_fh,
 741                              rename->rn_tname, rename->rn_tnamelen);
 742
 743         /* the underlying filesystem returns different error's than required
 744          * by NFSv4. both save_fh and current_fh have been verified.. */
 745         if (status == nfserr_isdir)
 746                 status = nfserr_exist;
 747         else if ((status == nfserr_notdir) &&
 748                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 749                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 750                 status = nfserr_exist;
 751         else if (status == nfserr_symlink)
 752                 status = nfserr_notdir;
 753
 754         if (!status) {
 755                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 756                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 757         }
 758         return status;
 759 }
 760
 761 static __be32
 762 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 763               struct nfsd4_secinfo *secinfo)
 764 {
 765         struct svc_fh resfh;
 766         struct svc_export *exp;
 767         struct dentry *dentry;
 768         __be32 err;
 769
 770         fh_init(&resfh, NFS4_FHSIZE);
 771         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 772                                     secinfo->si_name, secinfo->si_namelen,
 773                                     &exp, &dentry);
 774         if (err)
 775                 return err;
 776         if (dentry->d_inode == NULL) {
 777                 exp_put(exp);
 778                 err = nfserr_noent;
 779         } else
 780                 secinfo->si_exp = exp;
 781         dput(dentry);
 782         return err;
 783 }
 784
 785 static __be32
 786 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 787               struct nfsd4_setattr *setattr)
 788 {
 789         __be32 status = nfs_ok;
 790
 791         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 792                 nfs4_lock_state();
 793                 status = nfs4_preprocess_stateid_op(cstate,
 794                         &setattr->sa_stateid, WR_STATE, NULL);
 795                 nfs4_unlock_state();
 796                 if (status) {
 797                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 798                         return status;
 799                 }
 800         }
 801         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 802         if (status)
 803                 return status;
 804         status = nfs_ok;
 805
 806         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 807                                     nfsd_attrmask);
 808         if (status)
 809                 goto out;
 810
 811         if (setattr->sa_acl != NULL)
 812                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 813                                             setattr->sa_acl);
 814         if (status)
 815                 goto out;
 816         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 817                                 0, (time_t)0);
 818 out:
 819         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 820         return status;
 821 }
 822
 823 static __be32
 824 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 825             struct nfsd4_write *write)
 826 {
 827         stateid_t *stateid = &write->wr_stateid;
 828         struct file *filp = NULL;
 829         u32 *p;
 830         __be32 status = nfs_ok;
 831         unsigned long cnt;
 832
 833         /* no need to check permission - this will be done in nfsd_write() */
 834
 835         if (write->wr_offset >= OFFSET_MAX)
 836                 return nfserr_inval;
 837
 838         nfs4_lock_state();
 839         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 840         if (filp)
 841                 get_file(filp);
 842         nfs4_unlock_state();
 843
 844         if (status) {
 845                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 846                 return status;
 847         }
 848
 849         cnt = write->wr_buflen;
 850         write->wr_how_written = write->wr_stable_how;
 851         p = (u32 *)write->wr_verifier.data;
 852         *p++ = nfssvc_boot.tv_sec;
 853         *p++ = nfssvc_boot.tv_usec;
 854
 855         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 856                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 857                              &cnt, &write->wr_how_written);
 858         if (filp)
 859                 fput(filp);
 860
 861         write->wr_bytes_written = cnt;
 862
 863         if (status == nfserr_symlink)
 864                 status = nfserr_inval;
 865         return status;
 866 }
 867
 868 /* This routine never returns NFS_OK!  If there are no other errors, it
 869  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 870  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 871  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 872  */
 873 static __be32
 874 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 875              struct nfsd4_verify *verify)
 876 {
 877         __be32 *buf, *p;
 878         int count;
 879         __be32 status;
 880
 881         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 882         if (status)
 883                 return status;
 884
 885         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 886         if (status)
 887                 return status;
 888
 889         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 890             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 891                 return nfserr_inval;
 892         if (verify->ve_attrlen & 3)
 893                 return nfserr_inval;
 894
 895         /* count in words:
 896          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 897          */
 898         count = 4 + (verify->ve_attrlen >> 2);
 899         buf = kmalloc(count << 2, GFP_KERNEL);
 900         if (!buf)
 901                 return nfserr_resource;
 902
 903         status = nfsd4_encode_fattr(&cstate->current_fh,
 904                                     cstate->current_fh.fh_export,
 905                                     cstate->current_fh.fh_dentry, buf,
 906                                     &count, verify->ve_bmval,
 907                                     rqstp, 0);
 908
 909         /* this means that nfsd4_encode_fattr() ran out of space */
 910         if (status == nfserr_resource && count == 0)
 911                 status = nfserr_not_same;
 912         if (status)
 913                 goto out_kfree;
 914
 915         /* skip bitmap */
 916         p = buf + 1 + ntohl(buf[0]);
 917         status = nfserr_not_same;
 918         if (ntohl(*p++) != verify->ve_attrlen)
 919                 goto out_kfree;
 920         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 921                 status = nfserr_same;
 922
 923 out_kfree:
 924         kfree(buf);
 925         return status;
 926 }
 927
 928 static __be32
 929 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 930               struct nfsd4_verify *verify)
 931 {
 932         __be32 status;
 933
 934         status = _nfsd4_verify(rqstp, cstate, verify);
 935         return status == nfserr_not_same ? nfs_ok : status;
 936 }
 937
 938 static __be32
 939 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 940              struct nfsd4_verify *verify)
 941 {
 942         __be32 status;
 943
 944         status = _nfsd4_verify(rqstp, cstate, verify);
 945         return status == nfserr_same ? nfs_ok : status;
 946 }
 947
 948 /*
 949  * NULL call.
 950  */
 951 static __be32
 952 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 953 {
 954         return nfs_ok;
 955 }
 956
 957 static inline void nfsd4_increment_op_stats(u32 opnum)
 958 {
 959         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 960                 nfsdstats.nfs4_opcount[opnum]++;
 961 }
 962
 963 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 964                               void *);
 965 enum nfsd4_op_flags {
 966         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 967         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
 968         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
 969 };
 970
 971 struct nfsd4_operation {
 972         nfsd4op_func op_func;
 973         u32 op_flags;
 974         char *op_name;
 975 };
 976
 977 static struct nfsd4_operation nfsd4_ops[];
 978
 979 static const char *nfsd4_op_name(unsigned opnum);
 980
 981 /*
 982  * Enforce NFSv4.1 COMPOUND ordering rules.
 983  *
 984  * TODO:
 985  * - enforce NFS4ERR_NOT_ONLY_OP,
 986  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
 987  */
 988 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
 989 {
 990         if (args->minorversion && args->opcnt > 0) {
 991                 struct nfsd4_op *op = &args->ops[0];
 992                 return (op->status == nfserr_op_illegal) ||
 993                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
 994         }
 995         return true;
 996 }
 997
 998 /*
 999  * COMPOUND call.
1000  */
1001 static __be32
1002 nfsd4_proc_compound(struct svc_rqst *rqstp,
1003                     struct nfsd4_compoundargs *args,
1004                     struct nfsd4_compoundres *resp)
1005 {
1006         struct nfsd4_op *op;
1007         struct nfsd4_operation *opdesc;
1008         struct nfsd4_compound_state *cstate = &resp->cstate;
1009         int             slack_bytes;
1010         __be32          status;
1011
1012         resp->xbuf = &rqstp->rq_res;
1013         resp->p = rqstp->rq_res.head[0].iov_base +
1014                                                 rqstp->rq_res.head[0].iov_len;
1015         resp->tagp = resp->p;
1016         /* reserve space for: taglen, tag, and opcnt */
1017         resp->p += 2 + XDR_QUADLEN(args->taglen);
1018         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1019         resp->taglen = args->taglen;
1020         resp->tag = args->tag;
1021         resp->opcnt = 0;
1022         resp->rqstp = rqstp;
1023         resp->cstate.minorversion = args->minorversion;
1024         resp->cstate.replay_owner = NULL;
1025         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1026         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1027         /* Use the deferral mechanism only for NFSv4.0 compounds */
1028         rqstp->rq_usedeferral = (args->minorversion == 0);
1029
1030         /*
1031          * According to RFC3010, this takes precedence over all other errors.
1032          */
1033         status = nfserr_minor_vers_mismatch;
1034         if (args->minorversion > nfsd_supported_minorversion)
1035                 goto out;
1036
1037         if (!nfs41_op_ordering_ok(args)) {
1038                 op = &args->ops[0];
1039                 op->status = nfserr_sequence_pos;
1040                 goto encode_op;
1041         }
1042
1043         status = nfs_ok;
1044         while (!status && resp->opcnt < args->opcnt) {
1045                 op = &args->ops[resp->opcnt++];
1046
1047                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1048                         resp->opcnt, args->opcnt, op->opnum,
1049                         nfsd4_op_name(op->opnum));
1050                 /*
1051                  * The XDR decode routines may have pre-set op->status;
1052                  * for example, if there is a miscellaneous XDR error
1053                  * it will be set to nfserr_bad_xdr.
1054                  */
1055                 if (op->status)
1056                         goto encode_op;
1057
1058                 /* We must be able to encode a successful response to
1059                  * this operation, with enough room left over to encode a
1060                  * failed response to the next operation.  If we don't
1061                  * have enough room, fail with ERR_RESOURCE.
1062                  */
1063                 slack_bytes = (char *)resp->end - (char *)resp->p;
1064                 if (slack_bytes < COMPOUND_SLACK_SPACE
1065                                 + COMPOUND_ERR_SLACK_SPACE) {
1066                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1067                         op->status = nfserr_resource;
1068                         goto encode_op;
1069                 }
1070
1071                 opdesc = &nfsd4_ops[op->opnum];
1072
1073                 if (!cstate->current_fh.fh_dentry) {
1074                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1075                                 op->status = nfserr_nofilehandle;
1076                                 goto encode_op;
1077                         }
1078                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1079                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1080                         op->status = nfserr_moved;
1081                         goto encode_op;
1082                 }
1083
1084                 if (opdesc->op_func)
1085                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1086                 else
1087                         BUG_ON(op->status == nfs_ok);
1088
1089 encode_op:
1090                 /* Only from SEQUENCE */
1091                 if (resp->cstate.status == nfserr_replay_cache) {
1092                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1093                         status = op->status;
1094                         goto out;
1095                 }
1096                 if (op->status == nfserr_replay_me) {
1097                         op->replay = &cstate->replay_owner->so_replay;
1098                         nfsd4_encode_replay(resp, op);
1099                         status = op->status = op->replay->rp_status;
1100                 } else {
1101                         nfsd4_encode_operation(resp, op);
1102                         status = op->status;
1103                 }
1104
1105                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1106                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1107                         be32_to_cpu(status));
1108
1109                 if (cstate->replay_owner) {
1110                         nfs4_put_stateowner(cstate->replay_owner);
1111                         cstate->replay_owner = NULL;
1112                 }
1113                 /* XXX Ugh, we need to get rid of this kind of special case: */
1114                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1115                         fput(op->u.read.rd_filp);
1116
1117                 nfsd4_increment_op_stats(op->opnum);
1118         }
1119         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1120                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1121                 status = nfserr_jukebox;
1122         }
1123
1124         resp->cstate.status = status;
1125         fh_put(&resp->cstate.current_fh);
1126         fh_put(&resp->cstate.save_fh);
1127         BUG_ON(resp->cstate.replay_owner);
1128 out:
1129         nfsd4_release_compoundargs(args);
1130         /* Reset deferral mechanism for RPC deferrals */
1131         rqstp->rq_usedeferral = 1;
1132         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1133         return status;
1134 }
1135
1136 static struct nfsd4_operation nfsd4_ops[] = {
1137         [OP_ACCESS] = {
1138                 .op_func = (nfsd4op_func)nfsd4_access,
1139                 .op_name = "OP_ACCESS",
1140         },
1141         [OP_CLOSE] = {
1142                 .op_func = (nfsd4op_func)nfsd4_close,
1143                 .op_name = "OP_CLOSE",
1144         },
1145         [OP_COMMIT] = {
1146                 .op_func = (nfsd4op_func)nfsd4_commit,
1147                 .op_name = "OP_COMMIT",
1148         },
1149         [OP_CREATE] = {
1150                 .op_func = (nfsd4op_func)nfsd4_create,
1151                 .op_name = "OP_CREATE",
1152         },
1153         [OP_DELEGRETURN] = {
1154                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1155                 .op_name = "OP_DELEGRETURN",
1156         },
1157         [OP_GETATTR] = {
1158                 .op_func = (nfsd4op_func)nfsd4_getattr,
1159                 .op_flags = ALLOWED_ON_ABSENT_FS,
1160                 .op_name = "OP_GETATTR",
1161         },
1162         [OP_GETFH] = {
1163                 .op_func = (nfsd4op_func)nfsd4_getfh,
1164                 .op_name = "OP_GETFH",
1165         },
1166         [OP_LINK] = {
1167                 .op_func = (nfsd4op_func)nfsd4_link,
1168                 .op_name = "OP_LINK",
1169         },
1170         [OP_LOCK] = {
1171                 .op_func = (nfsd4op_func)nfsd4_lock,
1172                 .op_name = "OP_LOCK",
1173         },
1174         [OP_LOCKT] = {
1175                 .op_func = (nfsd4op_func)nfsd4_lockt,
1176                 .op_name = "OP_LOCKT",
1177         },
1178         [OP_LOCKU] = {
1179                 .op_func = (nfsd4op_func)nfsd4_locku,
1180                 .op_name = "OP_LOCKU",
1181         },
1182         [OP_LOOKUP] = {
1183                 .op_func = (nfsd4op_func)nfsd4_lookup,
1184                 .op_name = "OP_LOOKUP",
1185         },
1186         [OP_LOOKUPP] = {
1187                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1188                 .op_name = "OP_LOOKUPP",
1189         },
1190         [OP_NVERIFY] = {
1191                 .op_func = (nfsd4op_func)nfsd4_nverify,
1192                 .op_name = "OP_NVERIFY",
1193         },
1194         [OP_OPEN] = {
1195                 .op_func = (nfsd4op_func)nfsd4_open,
1196                 .op_name = "OP_OPEN",
1197         },
1198         [OP_OPEN_CONFIRM] = {
1199                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1200                 .op_name = "OP_OPEN_CONFIRM",
1201         },
1202         [OP_OPEN_DOWNGRADE] = {
1203                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1204                 .op_name = "OP_OPEN_DOWNGRADE",
1205         },
1206         [OP_PUTFH] = {
1207                 .op_func = (nfsd4op_func)nfsd4_putfh,
1208                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1209                 .op_name = "OP_PUTFH",
1210         },
1211         [OP_PUTPUBFH] = {
1212                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1213                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1214                 .op_name = "OP_PUTPUBFH",
1215         },
1216         [OP_PUTROOTFH] = {
1217                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1218                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1219                 .op_name = "OP_PUTROOTFH",
1220         },
1221         [OP_READ] = {
1222                 .op_func = (nfsd4op_func)nfsd4_read,
1223                 .op_name = "OP_READ",
1224         },
1225         [OP_READDIR] = {
1226                 .op_func = (nfsd4op_func)nfsd4_readdir,
1227                 .op_name = "OP_READDIR",
1228         },
1229         [OP_READLINK] = {
1230                 .op_func = (nfsd4op_func)nfsd4_readlink,
1231                 .op_name = "OP_READLINK",
1232         },
1233         [OP_REMOVE] = {
1234                 .op_func = (nfsd4op_func)nfsd4_remove,
1235                 .op_name = "OP_REMOVE",
1236         },
1237         [OP_RENAME] = {
1238                 .op_name = "OP_RENAME",
1239                 .op_func = (nfsd4op_func)nfsd4_rename,
1240         },
1241         [OP_RENEW] = {
1242                 .op_func = (nfsd4op_func)nfsd4_renew,
1243                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1244                 .op_name = "OP_RENEW",
1245         },
1246         [OP_RESTOREFH] = {
1247                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1248                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1249                 .op_name = "OP_RESTOREFH",
1250         },
1251         [OP_SAVEFH] = {
1252                 .op_func = (nfsd4op_func)nfsd4_savefh,
1253                 .op_name = "OP_SAVEFH",
1254         },
1255         [OP_SECINFO] = {
1256                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1257                 .op_name = "OP_SECINFO",
1258         },
1259         [OP_SETATTR] = {
1260                 .op_func = (nfsd4op_func)nfsd4_setattr,
1261                 .op_name = "OP_SETATTR",
1262         },
1263         [OP_SETCLIENTID] = {
1264                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1265                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1266                 .op_name = "OP_SETCLIENTID",
1267         },
1268         [OP_SETCLIENTID_CONFIRM] = {
1269                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1270                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1271                 .op_name = "OP_SETCLIENTID_CONFIRM",
1272         },
1273         [OP_VERIFY] = {
1274                 .op_func = (nfsd4op_func)nfsd4_verify,
1275                 .op_name = "OP_VERIFY",
1276         },
1277         [OP_WRITE] = {
1278                 .op_func = (nfsd4op_func)nfsd4_write,
1279                 .op_name = "OP_WRITE",
1280         },
1281         [OP_RELEASE_LOCKOWNER] = {
1282                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1283                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1284                 .op_name = "OP_RELEASE_LOCKOWNER",
1285         },
1286
1287         /* NFSv4.1 operations */
1288         [OP_EXCHANGE_ID] = {
1289                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1290                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1291                 .op_name = "OP_EXCHANGE_ID",
1292         },
1293         [OP_CREATE_SESSION] = {
1294                 .op_func = (nfsd4op_func)nfsd4_create_session,
1295                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1296                 .op_name = "OP_CREATE_SESSION",
1297         },
1298         [OP_DESTROY_SESSION] = {
1299                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1300                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1301                 .op_name = "OP_DESTROY_SESSION",
1302         },
1303         [OP_SEQUENCE] = {
1304                 .op_func = (nfsd4op_func)nfsd4_sequence,
1305                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1306                 .op_name = "OP_SEQUENCE",
1307         },
1308 };
1309
1310 static const char *nfsd4_op_name(unsigned opnum)
1311 {
1312         if (opnum < ARRAY_SIZE(nfsd4_ops))
1313                 return nfsd4_ops[opnum].op_name;
1314         return "unknown_operation";
1315 }
1316
1317 #define nfsd4_voidres                   nfsd4_voidargs
1318 struct nfsd4_voidargs { int dummy; };
1319
1320 /*
1321  * TODO: At the present time, the NFSv4 server does not do XID caching
1322  * of requests.  Implementing XID caching would not be a serious problem,
1323  * although it would require a mild change in interfaces since one
1324  * doesn't know whether an NFSv4 request is idempotent until after the
1325  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1326  * Astrand's regression testsuite for NFSv4 servers), which reuses
1327  * XID's liberally, so I've left it unimplemented until pynfs generates
1328  * better XID's.
1329  */
1330 static struct svc_procedure             nfsd_procedures4[2] = {
1331         [NFSPROC4_NULL] = {
1332                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1333                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1334                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1335                 .pc_ressize = sizeof(struct nfsd4_voidres),
1336                 .pc_cachetype = RC_NOCACHE,
1337                 .pc_xdrressize = 1,
1338         },
1339         [NFSPROC4_COMPOUND] = {
1340                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1341                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1342                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1343                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1344                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1345                 .pc_cachetype = RC_NOCACHE,
1346                 .pc_xdrressize = NFSD_BUFSIZE/4,
1347         },
1348 };
1349
1350 struct svc_version      nfsd_version4 = {
1351                 .vs_vers        = 4,
1352                 .vs_nproc       = 2,
1353                 .vs_proc        = nfsd_procedures4,
1354                 .vs_dispatch    = nfsd_dispatch,
1355                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1356 };
1357
1358 /*
1359  * Local variables:
1360  *  c-basic-offset: 8
1361  * End:
1362  */