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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         struct svc_export *exp = cstate->current_fh.fh_export;
  72
  73         /*
  74          * Check about attributes are supported by the NFSv4 server or not.
  75          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  76          */
  77         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  78             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  79             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  80                 return nfserr_attrnotsupp;
  81
  82         /*
  83          * Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS can be supported
  84          * in current environment or not.
  85          */
  86         if (bmval[0] & FATTR4_WORD0_ACL) {
  87                 if (!IS_POSIXACL(dentry->d_inode))
  88                         return nfserr_attrnotsupp;
  89         }
  90         if (bmval[0] & FATTR4_WORD0_FS_LOCATIONS) {
  91                 if (exp->ex_fslocs.locations == NULL)
  92                         return nfserr_attrnotsupp;
  93         }
  94
  95         /*
  96          * According to spec, read-only attributes return ERR_INVAL.
  97          */
  98         if (writable) {
  99                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 100                     (bmval[2] & ~writable[2]))
 101                         return nfserr_inval;
 102         }
 103
 104         return nfs_ok;
 105 }
 106
 107 static __be32
 108 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 109         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 110 {
 111         __be32 status = nfs_ok;
 112
 113         if (open->op_create == NFS4_OPEN_CREATE) {
 114                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 115                     || open->op_createmode == NFS4_CREATE_GUARDED)
 116                         status = check_attr_support(rqstp, cstate,
 117                                         open->op_bmval, nfsd_attrmask);
 118                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 119                         status = check_attr_support(rqstp, cstate,
 120                                         open->op_bmval, nfsd41_ex_attrmask);
 121         }
 122
 123         return status;
 124 }
 125
 126 static int
 127 is_create_with_attrs(struct nfsd4_open *open)
 128 {
 129         return open->op_create == NFS4_OPEN_CREATE
 130                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 131                     || open->op_createmode == NFS4_CREATE_GUARDED
 132                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 133 }
 134
 135 /*
 136  * if error occurs when setting the acl, just clear the acl bit
 137  * in the returned attr bitmap.
 138  */
 139 static void
 140 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 141                 struct nfs4_acl *acl, u32 *bmval)
 142 {
 143         __be32 status;
 144
 145         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 146         if (status)
 147                 /*
 148                  * We should probably fail the whole open at this point,
 149                  * but we've already created the file, so it's too late;
 150                  * So this seems the least of evils:
 151                  */
 152                 bmval[0] &= ~FATTR4_WORD0_ACL;
 153 }
 154
 155 static inline void
 156 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 157 {
 158         fh_put(dst);
 159         dget(src->fh_dentry);
 160         if (src->fh_export)
 161                 cache_get(&src->fh_export->h);
 162         *dst = *src;
 163 }
 164
 165 static __be32
 166 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 167 {
 168         __be32 status;
 169
 170         if (open->op_truncate &&
 171                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 172                 return nfserr_inval;
 173
 174         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 175                 accmode |= NFSD_MAY_READ;
 176         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 177                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 178         if (open->op_share_deny & NFS4_SHARE_DENY_WRITE)
 179                 accmode |= NFSD_MAY_WRITE;
 180
 181         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 182
 183         return status;
 184 }
 185
 186 static __be32
 187 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 188 {
 189         struct svc_fh resfh;
 190         __be32 status;
 191         int created = 0;
 192
 193         fh_init(&resfh, NFS4_FHSIZE);
 194         open->op_truncate = 0;
 195
 196         if (open->op_create) {
 197                 /* FIXME: check session persistence and pnfs flags.
 198                  * The nfsv4.1 spec requires the following semantics:
 199                  *
 200                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 201                  * Reply Cache  | server |                 |
 202                  * -------------+--------+-----------------+--------------------
 203                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 204                  *              |        |                 | (SHOULD)
 205                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 206                  *              |        |                 | (SHOULD NOT)
 207                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 208                  * yes          | no     | GUARDED4        | GUARDED4
 209                  * yes          | yes    | GUARDED4        | GUARDED4
 210                  */
 211
 212                 /*
 213                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 214                  * in NFSv4 as in v3.
 215                  */
 216                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 217                                         open->op_fname.len, &open->op_iattr,
 218                                         &resfh, open->op_createmode,
 219                                         (u32 *)open->op_verf.data,
 220                                         &open->op_truncate, &created);
 221
 222                 /*
 223                  * Following rfc 3530 14.2.16, use the returned bitmask
 224                  * to indicate which attributes we used to store the
 225                  * verifier:
 226                  */
 227                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 228                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 229                                                 FATTR4_WORD1_TIME_MODIFY);
 230         } else {
 231                 status = nfsd_lookup(rqstp, current_fh,
 232                                      open->op_fname.data, open->op_fname.len, &resfh);
 233                 fh_unlock(current_fh);
 234         }
 235         if (status)
 236                 goto out;
 237
 238         if (is_create_with_attrs(open) && open->op_acl != NULL)
 239                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 240
 241         set_change_info(&open->op_cinfo, current_fh);
 242         fh_dup2(current_fh, &resfh);
 243
 244         /* set reply cache */
 245         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 246                         &resfh.fh_handle);
 247         if (!created)
 248                 status = do_open_permission(rqstp, current_fh, open,
 249                                             NFSD_MAY_NOP);
 250
 251 out:
 252         fh_put(&resfh);
 253         return status;
 254 }
 255
 256 static __be32
 257 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 258 {
 259         __be32 status;
 260
 261         /* Only reclaims from previously confirmed clients are valid */
 262         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 263                 return status;
 264
 265         /* We don't know the target directory, and therefore can not
 266         * set the change info
 267         */
 268
 269         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 270
 271         /* set replay cache */
 272         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 273                         &current_fh->fh_handle);
 274
 275         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 276                 (open->op_iattr.ia_size == 0);
 277
 278         status = do_open_permission(rqstp, current_fh, open,
 279                                     NFSD_MAY_OWNER_OVERRIDE);
 280
 281         return status;
 282 }
 283
 284 static void
 285 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 286 {
 287         struct nfsd4_sessionid *sid =
 288                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 289
 290         clid->cl_boot = sid->clientid.cl_boot;
 291         clid->cl_id = sid->clientid.cl_id;
 292 }
 293
 294 static __be32
 295 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 296            struct nfsd4_open *open)
 297 {
 298         __be32 status;
 299         struct nfsd4_compoundres *resp;
 300
 301         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 302                 (int)open->op_fname.len, open->op_fname.data,
 303                 open->op_stateowner);
 304
 305         /* This check required by spec. */
 306         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 307                 return nfserr_inval;
 308
 309         if (nfsd4_has_session(cstate))
 310                 copy_clientid(&open->op_clientid, cstate->session);
 311
 312         nfs4_lock_state();
 313
 314         /* check seqid for replay. set nfs4_owner */
 315         resp = rqstp->rq_resp;
 316         status = nfsd4_process_open1(&resp->cstate, open);
 317         if (status == nfserr_replay_me) {
 318                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 319                 fh_put(&cstate->current_fh);
 320                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 321                                 &rp->rp_openfh);
 322                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 323                 if (status)
 324                         dprintk("nfsd4_open: replay failed"
 325                                 " restoring previous filehandle\n");
 326                 else
 327                         status = nfserr_replay_me;
 328         }
 329         if (status)
 330                 goto out;
 331
 332         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 333         if (status)
 334                 goto out;
 335
 336         /* Openowner is now set, so sequence id will get bumped.  Now we need
 337          * these checks before we do any creates: */
 338         status = nfserr_grace;
 339         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 340                 goto out;
 341         status = nfserr_no_grace;
 342         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 343                 goto out;
 344
 345         switch (open->op_claim_type) {
 346                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 347                 case NFS4_OPEN_CLAIM_NULL:
 348                         /*
 349                          * (1) set CURRENT_FH to the file being opened,
 350                          * creating it if necessary, (2) set open->op_cinfo,
 351                          * (3) set open->op_truncate if the file is to be
 352                          * truncated after opening, (4) do permission checking.
 353                          */
 354                         status = do_open_lookup(rqstp, &cstate->current_fh,
 355                                                 open);
 356                         if (status)
 357                                 goto out;
 358                         break;
 359                 case NFS4_OPEN_CLAIM_PREVIOUS:
 360                         open->op_stateowner->so_confirmed = 1;
 361                         /*
 362                          * The CURRENT_FH is already set to the file being
 363                          * opened.  (1) set open->op_cinfo, (2) set
 364                          * open->op_truncate if the file is to be truncated
 365                          * after opening, (3) do permission checking.
 366                         */
 367                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 368                                                  open);
 369                         if (status)
 370                                 goto out;
 371                         break;
 372                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 373                         open->op_stateowner->so_confirmed = 1;
 374                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 375                                 open->op_claim_type);
 376                         status = nfserr_notsupp;
 377                         goto out;
 378                 default:
 379                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 380                                 open->op_claim_type);
 381                         status = nfserr_inval;
 382                         goto out;
 383         }
 384         /*
 385          * nfsd4_process_open2() does the actual opening of the file.  If
 386          * successful, it (1) truncates the file if open->op_truncate was
 387          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 388          */
 389         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 390 out:
 391         if (open->op_stateowner) {
 392                 nfs4_get_stateowner(open->op_stateowner);
 393                 cstate->replay_owner = open->op_stateowner;
 394         }
 395         nfs4_unlock_state();
 396         return status;
 397 }
 398
 399 /*
 400  * filehandle-manipulating ops.
 401  */
 402 static __be32
 403 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 404             struct svc_fh **getfh)
 405 {
 406         if (!cstate->current_fh.fh_dentry)
 407                 return nfserr_nofilehandle;
 408
 409         *getfh = &cstate->current_fh;
 410         return nfs_ok;
 411 }
 412
 413 static __be32
 414 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 415             struct nfsd4_putfh *putfh)
 416 {
 417         fh_put(&cstate->current_fh);
 418         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 419         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 420                putfh->pf_fhlen);
 421         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 422 }
 423
 424 static __be32
 425 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 426                 void *arg)
 427 {
 428         __be32 status;
 429
 430         fh_put(&cstate->current_fh);
 431         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 432         return status;
 433 }
 434
 435 static __be32
 436 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 437                 void *arg)
 438 {
 439         if (!cstate->save_fh.fh_dentry)
 440                 return nfserr_restorefh;
 441
 442         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 443         return nfs_ok;
 444 }
 445
 446 static __be32
 447 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 448              void *arg)
 449 {
 450         if (!cstate->current_fh.fh_dentry)
 451                 return nfserr_nofilehandle;
 452
 453         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 454         return nfs_ok;
 455 }
 456
 457 /*
 458  * misc nfsv4 ops
 459  */
 460 static __be32
 461 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 462              struct nfsd4_access *access)
 463 {
 464         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 465                 return nfserr_inval;
 466
 467         access->ac_resp_access = access->ac_req_access;
 468         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 469                            &access->ac_supported);
 470 }
 471
 472 static __be32
 473 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 474              struct nfsd4_commit *commit)
 475 {
 476         __be32 status;
 477
 478         u32 *p = (u32 *)commit->co_verf.data;
 479         *p++ = nfssvc_boot.tv_sec;
 480         *p++ = nfssvc_boot.tv_usec;
 481
 482         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 483                              commit->co_count);
 484         if (status == nfserr_symlink)
 485                 status = nfserr_inval;
 486         return status;
 487 }
 488
 489 static __be32
 490 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 491              struct nfsd4_create *create)
 492 {
 493         struct svc_fh resfh;
 494         __be32 status;
 495         dev_t rdev;
 496
 497         fh_init(&resfh, NFS4_FHSIZE);
 498
 499         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 500                            NFSD_MAY_CREATE);
 501         if (status == nfserr_symlink)
 502                 status = nfserr_notdir;
 503         if (status)
 504                 return status;
 505
 506         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 507                                     nfsd_attrmask);
 508         if (status)
 509                 return status;
 510
 511         switch (create->cr_type) {
 512         case NF4LNK:
 513                 /* ugh! we have to null-terminate the linktext, or
 514                  * vfs_symlink() will choke.  it is always safe to
 515                  * null-terminate by brute force, since at worst we
 516                  * will overwrite the first byte of the create namelen
 517                  * in the XDR buffer, which has already been extracted
 518                  * during XDR decode.
 519                  */
 520                 create->cr_linkname[create->cr_linklen] = 0;
 521
 522                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 523                                       create->cr_name, create->cr_namelen,
 524                                       create->cr_linkname, create->cr_linklen,
 525                                       &resfh, &create->cr_iattr);
 526                 break;
 527
 528         case NF4BLK:
 529                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 530                 if (MAJOR(rdev) != create->cr_specdata1 ||
 531                     MINOR(rdev) != create->cr_specdata2)
 532                         return nfserr_inval;
 533                 status = nfsd_create(rqstp, &cstate->current_fh,
 534                                      create->cr_name, create->cr_namelen,
 535                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 536                 break;
 537
 538         case NF4CHR:
 539                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 540                 if (MAJOR(rdev) != create->cr_specdata1 ||
 541                     MINOR(rdev) != create->cr_specdata2)
 542                         return nfserr_inval;
 543                 status = nfsd_create(rqstp, &cstate->current_fh,
 544                                      create->cr_name, create->cr_namelen,
 545                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 546                 break;
 547
 548         case NF4SOCK:
 549                 status = nfsd_create(rqstp, &cstate->current_fh,
 550                                      create->cr_name, create->cr_namelen,
 551                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 552                 break;
 553
 554         case NF4FIFO:
 555                 status = nfsd_create(rqstp, &cstate->current_fh,
 556                                      create->cr_name, create->cr_namelen,
 557                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 558                 break;
 559
 560         case NF4DIR:
 561                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 562                 status = nfsd_create(rqstp, &cstate->current_fh,
 563                                      create->cr_name, create->cr_namelen,
 564                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 565                 break;
 566
 567         default:
 568                 status = nfserr_badtype;
 569         }
 570
 571         if (status)
 572                 goto out;
 573
 574         if (create->cr_acl != NULL)
 575                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 576                                 create->cr_bmval);
 577
 578         fh_unlock(&cstate->current_fh);
 579         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 580         fh_dup2(&cstate->current_fh, &resfh);
 581 out:
 582         fh_put(&resfh);
 583         return status;
 584 }
 585
 586 static __be32
 587 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 588               struct nfsd4_getattr *getattr)
 589 {
 590         __be32 status;
 591
 592         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 593         if (status)
 594                 return status;
 595
 596         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 597                 return nfserr_inval;
 598
 599         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 600         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 601         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 602
 603         getattr->ga_fhp = &cstate->current_fh;
 604         return nfs_ok;
 605 }
 606
 607 static __be32
 608 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 609            struct nfsd4_link *link)
 610 {
 611         __be32 status = nfserr_nofilehandle;
 612
 613         if (!cstate->save_fh.fh_dentry)
 614                 return status;
 615         status = nfsd_link(rqstp, &cstate->current_fh,
 616                            link->li_name, link->li_namelen, &cstate->save_fh);
 617         if (!status)
 618                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 619         return status;
 620 }
 621
 622 static __be32
 623 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 624               void *arg)
 625 {
 626         struct svc_fh tmp_fh;
 627         __be32 ret;
 628
 629         fh_init(&tmp_fh, NFS4_FHSIZE);
 630         ret = exp_pseudoroot(rqstp, &tmp_fh);
 631         if (ret)
 632                 return ret;
 633         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 634                 fh_put(&tmp_fh);
 635                 return nfserr_noent;
 636         }
 637         fh_put(&tmp_fh);
 638         return nfsd_lookup(rqstp, &cstate->current_fh,
 639                            "..", 2, &cstate->current_fh);
 640 }
 641
 642 static __be32
 643 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 644              struct nfsd4_lookup *lookup)
 645 {
 646         return nfsd_lookup(rqstp, &cstate->current_fh,
 647                            lookup->lo_name, lookup->lo_len,
 648                            &cstate->current_fh);
 649 }
 650
 651 static __be32
 652 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 653            struct nfsd4_read *read)
 654 {
 655         __be32 status;
 656
 657         /* no need to check permission - this will be done in nfsd_read() */
 658
 659         read->rd_filp = NULL;
 660         if (read->rd_offset >= OFFSET_MAX)
 661                 return nfserr_inval;
 662
 663         nfs4_lock_state();
 664         /* check stateid */
 665         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 666                                                  RD_STATE, &read->rd_filp))) {
 667                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 668                 goto out;
 669         }
 670         if (read->rd_filp)
 671                 get_file(read->rd_filp);
 672         status = nfs_ok;
 673 out:
 674         nfs4_unlock_state();
 675         read->rd_rqstp = rqstp;
 676         read->rd_fhp = &cstate->current_fh;
 677         return status;
 678 }
 679
 680 static __be32
 681 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 682               struct nfsd4_readdir *readdir)
 683 {
 684         u64 cookie = readdir->rd_cookie;
 685         static const nfs4_verifier zeroverf;
 686
 687         /* no need to check permission - this will be done in nfsd_readdir() */
 688
 689         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 690                 return nfserr_inval;
 691
 692         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 693         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 694         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 695
 696         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 697             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 698                 return nfserr_bad_cookie;
 699
 700         readdir->rd_rqstp = rqstp;
 701         readdir->rd_fhp = &cstate->current_fh;
 702         return nfs_ok;
 703 }
 704
 705 static __be32
 706 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 707                struct nfsd4_readlink *readlink)
 708 {
 709         readlink->rl_rqstp = rqstp;
 710         readlink->rl_fhp = &cstate->current_fh;
 711         return nfs_ok;
 712 }
 713
 714 static __be32
 715 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 716              struct nfsd4_remove *remove)
 717 {
 718         __be32 status;
 719
 720         if (locks_in_grace())
 721                 return nfserr_grace;
 722         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 723                              remove->rm_name, remove->rm_namelen);
 724         if (status == nfserr_symlink)
 725                 return nfserr_notdir;
 726         if (!status) {
 727                 fh_unlock(&cstate->current_fh);
 728                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 729         }
 730         return status;
 731 }
 732
 733 static __be32
 734 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 735              struct nfsd4_rename *rename)
 736 {
 737         __be32 status = nfserr_nofilehandle;
 738
 739         if (!cstate->save_fh.fh_dentry)
 740                 return status;
 741         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 742                                         & NFSEXP_NOSUBTREECHECK))
 743                 return nfserr_grace;
 744         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 745                              rename->rn_snamelen, &cstate->current_fh,
 746                              rename->rn_tname, rename->rn_tnamelen);
 747
 748         /* the underlying filesystem returns different error's than required
 749          * by NFSv4. both save_fh and current_fh have been verified.. */
 750         if (status == nfserr_isdir)
 751                 status = nfserr_exist;
 752         else if ((status == nfserr_notdir) &&
 753                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 754                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 755                 status = nfserr_exist;
 756         else if (status == nfserr_symlink)
 757                 status = nfserr_notdir;
 758
 759         if (!status) {
 760                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 761                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 762         }
 763         return status;
 764 }
 765
 766 static __be32
 767 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 768               struct nfsd4_secinfo *secinfo)
 769 {
 770         struct svc_fh resfh;
 771         struct svc_export *exp;
 772         struct dentry *dentry;
 773         __be32 err;
 774
 775         fh_init(&resfh, NFS4_FHSIZE);
 776         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 777                                     secinfo->si_name, secinfo->si_namelen,
 778                                     &exp, &dentry);
 779         if (err)
 780                 return err;
 781         if (dentry->d_inode == NULL) {
 782                 exp_put(exp);
 783                 err = nfserr_noent;
 784         } else
 785                 secinfo->si_exp = exp;
 786         dput(dentry);
 787         return err;
 788 }
 789
 790 static __be32
 791 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 792               struct nfsd4_setattr *setattr)
 793 {
 794         __be32 status = nfs_ok;
 795
 796         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 797                 nfs4_lock_state();
 798                 status = nfs4_preprocess_stateid_op(cstate,
 799                         &setattr->sa_stateid, WR_STATE, NULL);
 800                 nfs4_unlock_state();
 801                 if (status) {
 802                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 803                         return status;
 804                 }
 805         }
 806         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 807         if (status)
 808                 return status;
 809         status = nfs_ok;
 810
 811         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 812                                     nfsd_attrmask);
 813         if (status)
 814                 goto out;
 815
 816         if (setattr->sa_acl != NULL)
 817                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 818                                             setattr->sa_acl);
 819         if (status)
 820                 goto out;
 821         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 822                                 0, (time_t)0);
 823 out:
 824         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 825         return status;
 826 }
 827
 828 static __be32
 829 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 830             struct nfsd4_write *write)
 831 {
 832         stateid_t *stateid = &write->wr_stateid;
 833         struct file *filp = NULL;
 834         u32 *p;
 835         __be32 status = nfs_ok;
 836         unsigned long cnt;
 837
 838         /* no need to check permission - this will be done in nfsd_write() */
 839
 840         if (write->wr_offset >= OFFSET_MAX)
 841                 return nfserr_inval;
 842
 843         nfs4_lock_state();
 844         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 845         if (filp)
 846                 get_file(filp);
 847         nfs4_unlock_state();
 848
 849         if (status) {
 850                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 851                 return status;
 852         }
 853
 854         cnt = write->wr_buflen;
 855         write->wr_how_written = write->wr_stable_how;
 856         p = (u32 *)write->wr_verifier.data;
 857         *p++ = nfssvc_boot.tv_sec;
 858         *p++ = nfssvc_boot.tv_usec;
 859
 860         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 861                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 862                              &cnt, &write->wr_how_written);
 863         if (filp)
 864                 fput(filp);
 865
 866         write->wr_bytes_written = cnt;
 867
 868         if (status == nfserr_symlink)
 869                 status = nfserr_inval;
 870         return status;
 871 }
 872
 873 /* This routine never returns NFS_OK!  If there are no other errors, it
 874  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 875  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 876  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 877  */
 878 static __be32
 879 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 880              struct nfsd4_verify *verify)
 881 {
 882         __be32 *buf, *p;
 883         int count;
 884         __be32 status;
 885
 886         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 887         if (status)
 888                 return status;
 889
 890         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 891         if (status)
 892                 return status;
 893
 894         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 895             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 896                 return nfserr_inval;
 897         if (verify->ve_attrlen & 3)
 898                 return nfserr_inval;
 899
 900         /* count in words:
 901          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 902          */
 903         count = 4 + (verify->ve_attrlen >> 2);
 904         buf = kmalloc(count << 2, GFP_KERNEL);
 905         if (!buf)
 906                 return nfserr_resource;
 907
 908         status = nfsd4_encode_fattr(&cstate->current_fh,
 909                                     cstate->current_fh.fh_export,
 910                                     cstate->current_fh.fh_dentry, buf,
 911                                     &count, verify->ve_bmval,
 912                                     rqstp, 0);
 913
 914         /* this means that nfsd4_encode_fattr() ran out of space */
 915         if (status == nfserr_resource && count == 0)
 916                 status = nfserr_not_same;
 917         if (status)
 918                 goto out_kfree;
 919
 920         /* skip bitmap */
 921         p = buf + 1 + ntohl(buf[0]);
 922         status = nfserr_not_same;
 923         if (ntohl(*p++) != verify->ve_attrlen)
 924                 goto out_kfree;
 925         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 926                 status = nfserr_same;
 927
 928 out_kfree:
 929         kfree(buf);
 930         return status;
 931 }
 932
 933 static __be32
 934 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 935               struct nfsd4_verify *verify)
 936 {
 937         __be32 status;
 938
 939         status = _nfsd4_verify(rqstp, cstate, verify);
 940         return status == nfserr_not_same ? nfs_ok : status;
 941 }
 942
 943 static __be32
 944 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 945              struct nfsd4_verify *verify)
 946 {
 947         __be32 status;
 948
 949         status = _nfsd4_verify(rqstp, cstate, verify);
 950         return status == nfserr_same ? nfs_ok : status;
 951 }
 952
 953 /*
 954  * NULL call.
 955  */
 956 static __be32
 957 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 958 {
 959         return nfs_ok;
 960 }
 961
 962 static inline void nfsd4_increment_op_stats(u32 opnum)
 963 {
 964         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 965                 nfsdstats.nfs4_opcount[opnum]++;
 966 }
 967
 968 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 969                               void *);
 970 enum nfsd4_op_flags {
 971         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 972         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
 973         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
 974 };
 975
 976 struct nfsd4_operation {
 977         nfsd4op_func op_func;
 978         u32 op_flags;
 979         char *op_name;
 980 };
 981
 982 static struct nfsd4_operation nfsd4_ops[];
 983
 984 static const char *nfsd4_op_name(unsigned opnum);
 985
 986 /*
 987  * This is a replay of a compound for which no cache entry pages
 988  * were used. Encode the sequence operation, and if cachethis is FALSE
 989  * encode the uncache rep error on the next operation.
 990  */
 991 static __be32
 992 nfsd4_enc_uncached_replay(struct nfsd4_compoundargs *args,
 993                          struct nfsd4_compoundres *resp)
 994 {
 995         struct nfsd4_op *op;
 996
 997         dprintk("--> %s resp->opcnt %d ce_cachethis %u \n", __func__,
 998                 resp->opcnt, resp->cstate.slot->sl_cache_entry.ce_cachethis);
 999
1000         /* Encode the replayed sequence operation */
1001         BUG_ON(resp->opcnt != 1);
1002         op = &args->ops[resp->opcnt - 1];
1003         nfsd4_encode_operation(resp, op);
1004
1005         /*return nfserr_retry_uncached_rep in next operation. */
1006         if (resp->cstate.slot->sl_cache_entry.ce_cachethis == 0) {
1007                 op = &args->ops[resp->opcnt++];
1008                 op->status = nfserr_retry_uncached_rep;
1009                 nfsd4_encode_operation(resp, op);
1010         }
1011         return op->status;
1012 }
1013
1014 /*
1015  * Enforce NFSv4.1 COMPOUND ordering rules.
1016  *
1017  * TODO:
1018  * - enforce NFS4ERR_NOT_ONLY_OP,
1019  * - DESTROY_SESSION MUST be the final operation in the COMPOUND request.
1020  */
1021 static bool nfs41_op_ordering_ok(struct nfsd4_compoundargs *args)
1022 {
1023         if (args->minorversion && args->opcnt > 0) {
1024                 struct nfsd4_op *op = &args->ops[0];
1025                 return (op->status == nfserr_op_illegal) ||
1026                        (nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP);
1027         }
1028         return true;
1029 }
1030
1031 /*
1032  * COMPOUND call.
1033  */
1034 static __be32
1035 nfsd4_proc_compound(struct svc_rqst *rqstp,
1036                     struct nfsd4_compoundargs *args,
1037                     struct nfsd4_compoundres *resp)
1038 {
1039         struct nfsd4_op *op;
1040         struct nfsd4_operation *opdesc;
1041         struct nfsd4_compound_state *cstate = &resp->cstate;
1042         int             slack_bytes;
1043         __be32          status;
1044
1045         resp->xbuf = &rqstp->rq_res;
1046         resp->p = rqstp->rq_res.head[0].iov_base +
1047                                                 rqstp->rq_res.head[0].iov_len;
1048         resp->tagp = resp->p;
1049         /* reserve space for: taglen, tag, and opcnt */
1050         resp->p += 2 + XDR_QUADLEN(args->taglen);
1051         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1052         resp->taglen = args->taglen;
1053         resp->tag = args->tag;
1054         resp->opcnt = 0;
1055         resp->rqstp = rqstp;
1056         resp->cstate.minorversion = args->minorversion;
1057         resp->cstate.replay_owner = NULL;
1058         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1059         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1060         /* Use the deferral mechanism only for NFSv4.0 compounds */
1061         rqstp->rq_usedeferral = (args->minorversion == 0);
1062
1063         /*
1064          * According to RFC3010, this takes precedence over all other errors.
1065          */
1066         status = nfserr_minor_vers_mismatch;
1067         if (args->minorversion > nfsd_supported_minorversion)
1068                 goto out;
1069
1070         if (!nfs41_op_ordering_ok(args)) {
1071                 op = &args->ops[0];
1072                 op->status = nfserr_sequence_pos;
1073                 goto encode_op;
1074         }
1075
1076         status = nfs_ok;
1077         while (!status && resp->opcnt < args->opcnt) {
1078                 op = &args->ops[resp->opcnt++];
1079
1080                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1081                         resp->opcnt, args->opcnt, op->opnum,
1082                         nfsd4_op_name(op->opnum));
1083                 /*
1084                  * The XDR decode routines may have pre-set op->status;
1085                  * for example, if there is a miscellaneous XDR error
1086                  * it will be set to nfserr_bad_xdr.
1087                  */
1088                 if (op->status)
1089                         goto encode_op;
1090
1091                 /* We must be able to encode a successful response to
1092                  * this operation, with enough room left over to encode a
1093                  * failed response to the next operation.  If we don't
1094                  * have enough room, fail with ERR_RESOURCE.
1095                  */
1096                 slack_bytes = (char *)resp->end - (char *)resp->p;
1097                 if (slack_bytes < COMPOUND_SLACK_SPACE
1098                                 + COMPOUND_ERR_SLACK_SPACE) {
1099                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1100                         op->status = nfserr_resource;
1101                         goto encode_op;
1102                 }
1103
1104                 opdesc = &nfsd4_ops[op->opnum];
1105
1106                 if (!cstate->current_fh.fh_dentry) {
1107                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1108                                 op->status = nfserr_nofilehandle;
1109                                 goto encode_op;
1110                         }
1111                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1112                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1113                         op->status = nfserr_moved;
1114                         goto encode_op;
1115                 }
1116
1117                 if (opdesc->op_func)
1118                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1119                 else
1120                         BUG_ON(op->status == nfs_ok);
1121
1122 encode_op:
1123                 /* Only from SEQUENCE or CREATE_SESSION */
1124                 if (resp->cstate.status == nfserr_replay_cache) {
1125                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1126                         if (nfsd4_not_cached(resp))
1127                                 status = nfsd4_enc_uncached_replay(args, resp);
1128                         else
1129                                 status = op->status;
1130                         goto out;
1131                 }
1132                 if (op->status == nfserr_replay_me) {
1133                         op->replay = &cstate->replay_owner->so_replay;
1134                         nfsd4_encode_replay(resp, op);
1135                         status = op->status = op->replay->rp_status;
1136                 } else {
1137                         nfsd4_encode_operation(resp, op);
1138                         status = op->status;
1139                 }
1140
1141                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1142                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1143                         be32_to_cpu(status));
1144
1145                 if (cstate->replay_owner) {
1146                         nfs4_put_stateowner(cstate->replay_owner);
1147                         cstate->replay_owner = NULL;
1148                 }
1149                 /* XXX Ugh, we need to get rid of this kind of special case: */
1150                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1151                         fput(op->u.read.rd_filp);
1152
1153                 nfsd4_increment_op_stats(op->opnum);
1154         }
1155         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1156                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1157                 status = nfserr_jukebox;
1158         }
1159
1160         resp->cstate.status = status;
1161         fh_put(&resp->cstate.current_fh);
1162         fh_put(&resp->cstate.save_fh);
1163         BUG_ON(resp->cstate.replay_owner);
1164 out:
1165         nfsd4_release_compoundargs(args);
1166         /* Reset deferral mechanism for RPC deferrals */
1167         rqstp->rq_usedeferral = 1;
1168         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1169         return status;
1170 }
1171
1172 static struct nfsd4_operation nfsd4_ops[] = {
1173         [OP_ACCESS] = {
1174                 .op_func = (nfsd4op_func)nfsd4_access,
1175                 .op_name = "OP_ACCESS",
1176         },
1177         [OP_CLOSE] = {
1178                 .op_func = (nfsd4op_func)nfsd4_close,
1179                 .op_name = "OP_CLOSE",
1180         },
1181         [OP_COMMIT] = {
1182                 .op_func = (nfsd4op_func)nfsd4_commit,
1183                 .op_name = "OP_COMMIT",
1184         },
1185         [OP_CREATE] = {
1186                 .op_func = (nfsd4op_func)nfsd4_create,
1187                 .op_name = "OP_CREATE",
1188         },
1189         [OP_DELEGRETURN] = {
1190                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1191                 .op_name = "OP_DELEGRETURN",
1192         },
1193         [OP_GETATTR] = {
1194                 .op_func = (nfsd4op_func)nfsd4_getattr,
1195                 .op_flags = ALLOWED_ON_ABSENT_FS,
1196                 .op_name = "OP_GETATTR",
1197         },
1198         [OP_GETFH] = {
1199                 .op_func = (nfsd4op_func)nfsd4_getfh,
1200                 .op_name = "OP_GETFH",
1201         },
1202         [OP_LINK] = {
1203                 .op_func = (nfsd4op_func)nfsd4_link,
1204                 .op_name = "OP_LINK",
1205         },
1206         [OP_LOCK] = {
1207                 .op_func = (nfsd4op_func)nfsd4_lock,
1208                 .op_name = "OP_LOCK",
1209         },
1210         [OP_LOCKT] = {
1211                 .op_func = (nfsd4op_func)nfsd4_lockt,
1212                 .op_name = "OP_LOCKT",
1213         },
1214         [OP_LOCKU] = {
1215                 .op_func = (nfsd4op_func)nfsd4_locku,
1216                 .op_name = "OP_LOCKU",
1217         },
1218         [OP_LOOKUP] = {
1219                 .op_func = (nfsd4op_func)nfsd4_lookup,
1220                 .op_name = "OP_LOOKUP",
1221         },
1222         [OP_LOOKUPP] = {
1223                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1224                 .op_name = "OP_LOOKUPP",
1225         },
1226         [OP_NVERIFY] = {
1227                 .op_func = (nfsd4op_func)nfsd4_nverify,
1228                 .op_name = "OP_NVERIFY",
1229         },
1230         [OP_OPEN] = {
1231                 .op_func = (nfsd4op_func)nfsd4_open,
1232                 .op_name = "OP_OPEN",
1233         },
1234         [OP_OPEN_CONFIRM] = {
1235                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1236                 .op_name = "OP_OPEN_CONFIRM",
1237         },
1238         [OP_OPEN_DOWNGRADE] = {
1239                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1240                 .op_name = "OP_OPEN_DOWNGRADE",
1241         },
1242         [OP_PUTFH] = {
1243                 .op_func = (nfsd4op_func)nfsd4_putfh,
1244                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1245                 .op_name = "OP_PUTFH",
1246         },
1247         [OP_PUTPUBFH] = {
1248                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1249                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1250                 .op_name = "OP_PUTPUBFH",
1251         },
1252         [OP_PUTROOTFH] = {
1253                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1254                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1255                 .op_name = "OP_PUTROOTFH",
1256         },
1257         [OP_READ] = {
1258                 .op_func = (nfsd4op_func)nfsd4_read,
1259                 .op_name = "OP_READ",
1260         },
1261         [OP_READDIR] = {
1262                 .op_func = (nfsd4op_func)nfsd4_readdir,
1263                 .op_name = "OP_READDIR",
1264         },
1265         [OP_READLINK] = {
1266                 .op_func = (nfsd4op_func)nfsd4_readlink,
1267                 .op_name = "OP_READLINK",
1268         },
1269         [OP_REMOVE] = {
1270                 .op_func = (nfsd4op_func)nfsd4_remove,
1271                 .op_name = "OP_REMOVE",
1272         },
1273         [OP_RENAME] = {
1274                 .op_name = "OP_RENAME",
1275                 .op_func = (nfsd4op_func)nfsd4_rename,
1276         },
1277         [OP_RENEW] = {
1278                 .op_func = (nfsd4op_func)nfsd4_renew,
1279                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1280                 .op_name = "OP_RENEW",
1281         },
1282         [OP_RESTOREFH] = {
1283                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1284                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1285                 .op_name = "OP_RESTOREFH",
1286         },
1287         [OP_SAVEFH] = {
1288                 .op_func = (nfsd4op_func)nfsd4_savefh,
1289                 .op_name = "OP_SAVEFH",
1290         },
1291         [OP_SECINFO] = {
1292                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1293                 .op_name = "OP_SECINFO",
1294         },
1295         [OP_SETATTR] = {
1296                 .op_func = (nfsd4op_func)nfsd4_setattr,
1297                 .op_name = "OP_SETATTR",
1298         },
1299         [OP_SETCLIENTID] = {
1300                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1301                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1302                 .op_name = "OP_SETCLIENTID",
1303         },
1304         [OP_SETCLIENTID_CONFIRM] = {
1305                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1306                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1307                 .op_name = "OP_SETCLIENTID_CONFIRM",
1308         },
1309         [OP_VERIFY] = {
1310                 .op_func = (nfsd4op_func)nfsd4_verify,
1311                 .op_name = "OP_VERIFY",
1312         },
1313         [OP_WRITE] = {
1314                 .op_func = (nfsd4op_func)nfsd4_write,
1315                 .op_name = "OP_WRITE",
1316         },
1317         [OP_RELEASE_LOCKOWNER] = {
1318                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1319                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1320                 .op_name = "OP_RELEASE_LOCKOWNER",
1321         },
1322
1323         /* NFSv4.1 operations */
1324         [OP_EXCHANGE_ID] = {
1325                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1326                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1327                 .op_name = "OP_EXCHANGE_ID",
1328         },
1329         [OP_CREATE_SESSION] = {
1330                 .op_func = (nfsd4op_func)nfsd4_create_session,
1331                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1332                 .op_name = "OP_CREATE_SESSION",
1333         },
1334         [OP_DESTROY_SESSION] = {
1335                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1336                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1337                 .op_name = "OP_DESTROY_SESSION",
1338         },
1339         [OP_SEQUENCE] = {
1340                 .op_func = (nfsd4op_func)nfsd4_sequence,
1341                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1342                 .op_name = "OP_SEQUENCE",
1343         },
1344 };
1345
1346 static const char *nfsd4_op_name(unsigned opnum)
1347 {
1348         if (opnum < ARRAY_SIZE(nfsd4_ops))
1349                 return nfsd4_ops[opnum].op_name;
1350         return "unknown_operation";
1351 }
1352
1353 #define nfsd4_voidres                   nfsd4_voidargs
1354 struct nfsd4_voidargs { int dummy; };
1355
1356 /*
1357  * TODO: At the present time, the NFSv4 server does not do XID caching
1358  * of requests.  Implementing XID caching would not be a serious problem,
1359  * although it would require a mild change in interfaces since one
1360  * doesn't know whether an NFSv4 request is idempotent until after the
1361  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1362  * Astrand's regression testsuite for NFSv4 servers), which reuses
1363  * XID's liberally, so I've left it unimplemented until pynfs generates
1364  * better XID's.
1365  */
1366 static struct svc_procedure             nfsd_procedures4[2] = {
1367         [NFSPROC4_NULL] = {
1368                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1369                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1370                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1371                 .pc_ressize = sizeof(struct nfsd4_voidres),
1372                 .pc_cachetype = RC_NOCACHE,
1373                 .pc_xdrressize = 1,
1374         },
1375         [NFSPROC4_COMPOUND] = {
1376                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1377                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1378                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1379                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1380                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1381                 .pc_cachetype = RC_NOCACHE,
1382                 .pc_xdrressize = NFSD_BUFSIZE/4,
1383         },
1384 };
1385
1386 struct svc_version      nfsd_version4 = {
1387                 .vs_vers        = 4,
1388                 .vs_nproc       = 2,
1389                 .vs_proc        = nfsd_procedures4,
1390                 .vs_dispatch    = nfsd_dispatch,
1391                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1392 };
1393
1394 /*
1395  * Local variables:
1396  *  c-basic-offset: 8
1397  * End:
1398  */