fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42
  43 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  44
  45 static u32 nfsd_attrmask[] = {
  46         NFSD_WRITEABLE_ATTRS_WORD0,
  47         NFSD_WRITEABLE_ATTRS_WORD1,
  48         NFSD_WRITEABLE_ATTRS_WORD2
  49 };
  50
  51 static u32 nfsd41_ex_attrmask[] = {
  52         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  53         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  54         NFSD_SUPPATTR_EXCLCREAT_WORD2
  55 };
  56
  57 static __be32
  58 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  59                    u32 *bmval, u32 *writable)
  60 {
  61         struct dentry *dentry = cstate->current_fh.fh_dentry;
  62
  63         /*
  64          * Check about attributes are supported by the NFSv4 server or not.
  65          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  66          */
  67         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  68             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  69             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  70                 return nfserr_attrnotsupp;
  71
  72         /*
  73          * Check FATTR4_WORD0_ACL can be supported
  74          * in current environment or not.
  75          */
  76         if (bmval[0] & FATTR4_WORD0_ACL) {
  77                 if (!IS_POSIXACL(dentry->d_inode))
  78                         return nfserr_attrnotsupp;
  79         }
  80
  81         /*
  82          * According to spec, read-only attributes return ERR_INVAL.
  83          */
  84         if (writable) {
  85                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  86                     (bmval[2] & ~writable[2]))
  87                         return nfserr_inval;
  88         }
  89
  90         return nfs_ok;
  91 }
  92
  93 static __be32
  94 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  95         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  96 {
  97         __be32 status = nfs_ok;
  98
  99         if (open->op_create == NFS4_OPEN_CREATE) {
 100                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 101                     || open->op_createmode == NFS4_CREATE_GUARDED)
 102                         status = check_attr_support(rqstp, cstate,
 103                                         open->op_bmval, nfsd_attrmask);
 104                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 105                         status = check_attr_support(rqstp, cstate,
 106                                         open->op_bmval, nfsd41_ex_attrmask);
 107         }
 108
 109         return status;
 110 }
 111
 112 static int
 113 is_create_with_attrs(struct nfsd4_open *open)
 114 {
 115         return open->op_create == NFS4_OPEN_CREATE
 116                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 117                     || open->op_createmode == NFS4_CREATE_GUARDED
 118                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 119 }
 120
 121 /*
 122  * if error occurs when setting the acl, just clear the acl bit
 123  * in the returned attr bitmap.
 124  */
 125 static void
 126 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 127                 struct nfs4_acl *acl, u32 *bmval)
 128 {
 129         __be32 status;
 130
 131         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 132         if (status)
 133                 /*
 134                  * We should probably fail the whole open at this point,
 135                  * but we've already created the file, so it's too late;
 136                  * So this seems the least of evils:
 137                  */
 138                 bmval[0] &= ~FATTR4_WORD0_ACL;
 139 }
 140
 141 static inline void
 142 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 143 {
 144         fh_put(dst);
 145         dget(src->fh_dentry);
 146         if (src->fh_export)
 147                 cache_get(&src->fh_export->h);
 148         *dst = *src;
 149 }
 150
 151 static __be32
 152 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 153 {
 154         __be32 status;
 155
 156         if (open->op_truncate &&
 157                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 158                 return nfserr_inval;
 159
 160         accmode |= NFSD_MAY_READ_IF_EXEC;
 161
 162         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 163                 accmode |= NFSD_MAY_READ;
 164         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 165                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 166         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 167                 accmode |= NFSD_MAY_WRITE;
 168
 169         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 170
 171         return status;
 172 }
 173
 174 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 175 {
 176         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 177
 178         if (S_ISREG(mode))
 179                 return nfs_ok;
 180         if (S_ISDIR(mode))
 181                 return nfserr_isdir;
 182         /*
 183          * Using err_symlink as our catch-all case may look odd; but
 184          * there's no other obvious error for this case in 4.0, and we
 185          * happen to know that it will cause the linux v4 client to do
 186          * the right thing on attempts to open something other than a
 187          * regular file.
 188          */
 189         return nfserr_symlink;
 190 }
 191
 192 static __be32
 193 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 194 {
 195         struct svc_fh resfh;
 196         __be32 status;
 197         int created = 0;
 198
 199         fh_init(&resfh, NFS4_FHSIZE);
 200         open->op_truncate = 0;
 201
 202         if (open->op_create) {
 203                 /* FIXME: check session persistence and pnfs flags.
 204                  * The nfsv4.1 spec requires the following semantics:
 205                  *
 206                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 207                  * Reply Cache  | server |                 |
 208                  * -------------+--------+-----------------+--------------------
 209                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 210                  *              |        |                 | (SHOULD)
 211                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 212                  *              |        |                 | (SHOULD NOT)
 213                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 214                  * yes          | no     | GUARDED4        | GUARDED4
 215                  * yes          | yes    | GUARDED4        | GUARDED4
 216                  */
 217
 218                 /*
 219                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 220                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 221                  */
 222                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 223                                         open->op_fname.len, &open->op_iattr,
 224                                         &resfh, open->op_createmode,
 225                                         (u32 *)open->op_verf.data,
 226                                         &open->op_truncate, &created);
 227
 228                 /*
 229                  * Following rfc 3530 14.2.16, use the returned bitmask
 230                  * to indicate which attributes we used to store the
 231                  * verifier:
 232                  */
 233                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 234                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 235                                                 FATTR4_WORD1_TIME_MODIFY);
 236         } else {
 237                 status = nfsd_lookup(rqstp, current_fh,
 238                                      open->op_fname.data, open->op_fname.len, &resfh);
 239                 fh_unlock(current_fh);
 240                 if (status)
 241                         goto out;
 242                 status = nfsd_check_obj_isreg(&resfh);
 243         }
 244         if (status)
 245                 goto out;
 246
 247         if (is_create_with_attrs(open) && open->op_acl != NULL)
 248                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 249
 250         set_change_info(&open->op_cinfo, current_fh);
 251         fh_dup2(current_fh, &resfh);
 252
 253         /* set reply cache */
 254         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 255                         &resfh.fh_handle);
 256         if (!created)
 257                 status = do_open_permission(rqstp, current_fh, open,
 258                                             NFSD_MAY_NOP);
 259
 260 out:
 261         fh_put(&resfh);
 262         return status;
 263 }
 264
 265 static __be32
 266 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 267 {
 268         __be32 status;
 269
 270         /* Only reclaims from previously confirmed clients are valid */
 271         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 272                 return status;
 273
 274         /* We don't know the target directory, and therefore can not
 275         * set the change info
 276         */
 277
 278         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 279
 280         /* set replay cache */
 281         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 282                         &current_fh->fh_handle);
 283
 284         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 285                 (open->op_iattr.ia_size == 0);
 286
 287         status = do_open_permission(rqstp, current_fh, open,
 288                                     NFSD_MAY_OWNER_OVERRIDE);
 289
 290         return status;
 291 }
 292
 293 static void
 294 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 295 {
 296         struct nfsd4_sessionid *sid =
 297                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 298
 299         clid->cl_boot = sid->clientid.cl_boot;
 300         clid->cl_id = sid->clientid.cl_id;
 301 }
 302
 303 static __be32
 304 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 305            struct nfsd4_open *open)
 306 {
 307         __be32 status;
 308         struct nfsd4_compoundres *resp;
 309
 310         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 311                 (int)open->op_fname.len, open->op_fname.data,
 312                 open->op_openowner);
 313
 314         /* This check required by spec. */
 315         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 316                 return nfserr_inval;
 317
 318         /*
 319          * RFC5661 18.51.3
 320          * Before RECLAIM_COMPLETE done, server should deny new lock
 321          */
 322         if (nfsd4_has_session(cstate) &&
 323             !cstate->session->se_client->cl_firststate &&
 324             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 325                 return nfserr_grace;
 326
 327         if (nfsd4_has_session(cstate))
 328                 copy_clientid(&open->op_clientid, cstate->session);
 329
 330         nfs4_lock_state();
 331
 332         /* check seqid for replay. set nfs4_owner */
 333         resp = rqstp->rq_resp;
 334         status = nfsd4_process_open1(&resp->cstate, open);
 335         if (status == nfserr_replay_me) {
 336                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 337                 fh_put(&cstate->current_fh);
 338                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 339                                 &rp->rp_openfh);
 340                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 341                 if (status)
 342                         dprintk("nfsd4_open: replay failed"
 343                                 " restoring previous filehandle\n");
 344                 else
 345                         status = nfserr_replay_me;
 346         }
 347         if (status)
 348                 goto out;
 349
 350         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 351         if (status)
 352                 goto out;
 353
 354         /* Openowner is now set, so sequence id will get bumped.  Now we need
 355          * these checks before we do any creates: */
 356         status = nfserr_grace;
 357         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 358                 goto out;
 359         status = nfserr_no_grace;
 360         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 361                 goto out;
 362
 363         switch (open->op_claim_type) {
 364                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 365                 case NFS4_OPEN_CLAIM_NULL:
 366                         /*
 367                          * (1) set CURRENT_FH to the file being opened,
 368                          * creating it if necessary, (2) set open->op_cinfo,
 369                          * (3) set open->op_truncate if the file is to be
 370                          * truncated after opening, (4) do permission checking.
 371                          */
 372                         status = do_open_lookup(rqstp, &cstate->current_fh,
 373                                                 open);
 374                         if (status)
 375                                 goto out;
 376                         break;
 377                 case NFS4_OPEN_CLAIM_PREVIOUS:
 378                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 379                         /*
 380                          * The CURRENT_FH is already set to the file being
 381                          * opened.  (1) set open->op_cinfo, (2) set
 382                          * open->op_truncate if the file is to be truncated
 383                          * after opening, (3) do permission checking.
 384                         */
 385                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 386                                                  open);
 387                         if (status)
 388                                 goto out;
 389                         break;
 390                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 391                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 392                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 393                                 open->op_claim_type);
 394                         status = nfserr_notsupp;
 395                         goto out;
 396                 default:
 397                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 398                                 open->op_claim_type);
 399                         status = nfserr_inval;
 400                         goto out;
 401         }
 402         /*
 403          * nfsd4_process_open2() does the actual opening of the file.  If
 404          * successful, it (1) truncates the file if open->op_truncate was
 405          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 406          */
 407         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 408 out:
 409         if (open->op_openowner)
 410                 cstate->replay_owner = &open->op_openowner->oo_owner;
 411         else
 412                 nfs4_unlock_state();
 413         return status;
 414 }
 415
 416 /*
 417  * filehandle-manipulating ops.
 418  */
 419 static __be32
 420 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 421             struct svc_fh **getfh)
 422 {
 423         if (!cstate->current_fh.fh_dentry)
 424                 return nfserr_nofilehandle;
 425
 426         *getfh = &cstate->current_fh;
 427         return nfs_ok;
 428 }
 429
 430 static __be32
 431 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 432             struct nfsd4_putfh *putfh)
 433 {
 434         fh_put(&cstate->current_fh);
 435         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 436         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 437                putfh->pf_fhlen);
 438         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 439 }
 440
 441 static __be32
 442 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 443                 void *arg)
 444 {
 445         __be32 status;
 446
 447         fh_put(&cstate->current_fh);
 448         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 449         return status;
 450 }
 451
 452 static __be32
 453 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 454                 void *arg)
 455 {
 456         if (!cstate->save_fh.fh_dentry)
 457                 return nfserr_restorefh;
 458
 459         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 460         return nfs_ok;
 461 }
 462
 463 static __be32
 464 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 465              void *arg)
 466 {
 467         if (!cstate->current_fh.fh_dentry)
 468                 return nfserr_nofilehandle;
 469
 470         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 471         return nfs_ok;
 472 }
 473
 474 /*
 475  * misc nfsv4 ops
 476  */
 477 static __be32
 478 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 479              struct nfsd4_access *access)
 480 {
 481         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 482                 return nfserr_inval;
 483
 484         access->ac_resp_access = access->ac_req_access;
 485         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 486                            &access->ac_supported);
 487 }
 488
 489 static __be32
 490 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 491              struct nfsd4_commit *commit)
 492 {
 493         u32 *p = (u32 *)commit->co_verf.data;
 494         *p++ = nfssvc_boot.tv_sec;
 495         *p++ = nfssvc_boot.tv_usec;
 496
 497         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 498                              commit->co_count);
 499 }
 500
 501 static __be32
 502 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 503              struct nfsd4_create *create)
 504 {
 505         struct svc_fh resfh;
 506         __be32 status;
 507         dev_t rdev;
 508
 509         fh_init(&resfh, NFS4_FHSIZE);
 510
 511         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 512                            NFSD_MAY_CREATE);
 513         if (status)
 514                 return status;
 515
 516         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 517                                     nfsd_attrmask);
 518         if (status)
 519                 return status;
 520
 521         switch (create->cr_type) {
 522         case NF4LNK:
 523                 /* ugh! we have to null-terminate the linktext, or
 524                  * vfs_symlink() will choke.  it is always safe to
 525                  * null-terminate by brute force, since at worst we
 526                  * will overwrite the first byte of the create namelen
 527                  * in the XDR buffer, which has already been extracted
 528                  * during XDR decode.
 529                  */
 530                 create->cr_linkname[create->cr_linklen] = 0;
 531
 532                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 533                                       create->cr_name, create->cr_namelen,
 534                                       create->cr_linkname, create->cr_linklen,
 535                                       &resfh, &create->cr_iattr);
 536                 break;
 537
 538         case NF4BLK:
 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_IFBLK, rdev, &resfh);
 546                 break;
 547
 548         case NF4CHR:
 549                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 550                 if (MAJOR(rdev) != create->cr_specdata1 ||
 551                     MINOR(rdev) != create->cr_specdata2)
 552                         return nfserr_inval;
 553                 status = nfsd_create(rqstp, &cstate->current_fh,
 554                                      create->cr_name, create->cr_namelen,
 555                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 556                 break;
 557
 558         case NF4SOCK:
 559                 status = nfsd_create(rqstp, &cstate->current_fh,
 560                                      create->cr_name, create->cr_namelen,
 561                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 562                 break;
 563
 564         case NF4FIFO:
 565                 status = nfsd_create(rqstp, &cstate->current_fh,
 566                                      create->cr_name, create->cr_namelen,
 567                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 568                 break;
 569
 570         case NF4DIR:
 571                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 572                 status = nfsd_create(rqstp, &cstate->current_fh,
 573                                      create->cr_name, create->cr_namelen,
 574                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 575                 break;
 576
 577         default:
 578                 status = nfserr_badtype;
 579         }
 580
 581         if (status)
 582                 goto out;
 583
 584         if (create->cr_acl != NULL)
 585                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 586                                 create->cr_bmval);
 587
 588         fh_unlock(&cstate->current_fh);
 589         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 590         fh_dup2(&cstate->current_fh, &resfh);
 591 out:
 592         fh_put(&resfh);
 593         return status;
 594 }
 595
 596 static __be32
 597 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 598               struct nfsd4_getattr *getattr)
 599 {
 600         __be32 status;
 601
 602         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 603         if (status)
 604                 return status;
 605
 606         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 607                 return nfserr_inval;
 608
 609         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 610         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 611         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 612
 613         getattr->ga_fhp = &cstate->current_fh;
 614         return nfs_ok;
 615 }
 616
 617 static __be32
 618 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 619            struct nfsd4_link *link)
 620 {
 621         __be32 status = nfserr_nofilehandle;
 622
 623         if (!cstate->save_fh.fh_dentry)
 624                 return status;
 625         status = nfsd_link(rqstp, &cstate->current_fh,
 626                            link->li_name, link->li_namelen, &cstate->save_fh);
 627         if (!status)
 628                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 629         return status;
 630 }
 631
 632 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 633 {
 634         struct svc_fh tmp_fh;
 635         __be32 ret;
 636
 637         fh_init(&tmp_fh, NFS4_FHSIZE);
 638         ret = exp_pseudoroot(rqstp, &tmp_fh);
 639         if (ret)
 640                 return ret;
 641         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 642                 fh_put(&tmp_fh);
 643                 return nfserr_noent;
 644         }
 645         fh_put(&tmp_fh);
 646         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 647 }
 648
 649 static __be32
 650 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 651               void *arg)
 652 {
 653         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 654 }
 655
 656 static __be32
 657 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 658              struct nfsd4_lookup *lookup)
 659 {
 660         return nfsd_lookup(rqstp, &cstate->current_fh,
 661                            lookup->lo_name, lookup->lo_len,
 662                            &cstate->current_fh);
 663 }
 664
 665 static __be32
 666 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 667            struct nfsd4_read *read)
 668 {
 669         __be32 status;
 670
 671         /* no need to check permission - this will be done in nfsd_read() */
 672
 673         read->rd_filp = NULL;
 674         if (read->rd_offset >= OFFSET_MAX)
 675                 return nfserr_inval;
 676
 677         nfs4_lock_state();
 678         /* check stateid */
 679         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 680                                                  RD_STATE, &read->rd_filp))) {
 681                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 682                 goto out;
 683         }
 684         if (read->rd_filp)
 685                 get_file(read->rd_filp);
 686         status = nfs_ok;
 687 out:
 688         nfs4_unlock_state();
 689         read->rd_rqstp = rqstp;
 690         read->rd_fhp = &cstate->current_fh;
 691         return status;
 692 }
 693
 694 static __be32
 695 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 696               struct nfsd4_readdir *readdir)
 697 {
 698         u64 cookie = readdir->rd_cookie;
 699         static const nfs4_verifier zeroverf;
 700
 701         /* no need to check permission - this will be done in nfsd_readdir() */
 702
 703         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 704                 return nfserr_inval;
 705
 706         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 707         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 708         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 709
 710         if ((cookie == 1) || (cookie == 2) ||
 711             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 712                 return nfserr_bad_cookie;
 713
 714         readdir->rd_rqstp = rqstp;
 715         readdir->rd_fhp = &cstate->current_fh;
 716         return nfs_ok;
 717 }
 718
 719 static __be32
 720 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 721                struct nfsd4_readlink *readlink)
 722 {
 723         readlink->rl_rqstp = rqstp;
 724         readlink->rl_fhp = &cstate->current_fh;
 725         return nfs_ok;
 726 }
 727
 728 static __be32
 729 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 730              struct nfsd4_remove *remove)
 731 {
 732         __be32 status;
 733
 734         if (locks_in_grace())
 735                 return nfserr_grace;
 736         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 737                              remove->rm_name, remove->rm_namelen);
 738         if (!status) {
 739                 fh_unlock(&cstate->current_fh);
 740                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 741         }
 742         return status;
 743 }
 744
 745 static __be32
 746 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 747              struct nfsd4_rename *rename)
 748 {
 749         __be32 status = nfserr_nofilehandle;
 750
 751         if (!cstate->save_fh.fh_dentry)
 752                 return status;
 753         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 754                                         & NFSEXP_NOSUBTREECHECK))
 755                 return nfserr_grace;
 756         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 757                              rename->rn_snamelen, &cstate->current_fh,
 758                              rename->rn_tname, rename->rn_tnamelen);
 759
 760         /* the underlying filesystem returns different error's than required
 761          * by NFSv4. both save_fh and current_fh have been verified.. */
 762         if (status == nfserr_isdir)
 763                 status = nfserr_exist;
 764         else if ((status == nfserr_notdir) &&
 765                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 766                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 767                 status = nfserr_exist;
 768
 769         if (!status) {
 770                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 771                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 772         }
 773         return status;
 774 }
 775
 776 static __be32
 777 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 778               struct nfsd4_secinfo *secinfo)
 779 {
 780         struct svc_fh resfh;
 781         struct svc_export *exp;
 782         struct dentry *dentry;
 783         __be32 err;
 784
 785         fh_init(&resfh, NFS4_FHSIZE);
 786         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 787         if (err)
 788                 return err;
 789         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 790                                     secinfo->si_name, secinfo->si_namelen,
 791                                     &exp, &dentry);
 792         if (err)
 793                 return err;
 794         if (dentry->d_inode == NULL) {
 795                 exp_put(exp);
 796                 err = nfserr_noent;
 797         } else
 798                 secinfo->si_exp = exp;
 799         dput(dentry);
 800         if (cstate->minorversion)
 801                 /* See rfc 5661 section 2.6.3.1.1.8 */
 802                 fh_put(&cstate->current_fh);
 803         return err;
 804 }
 805
 806 static __be32
 807 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 808               struct nfsd4_secinfo_no_name *sin)
 809 {
 810         __be32 err;
 811
 812         switch (sin->sin_style) {
 813         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 814                 break;
 815         case NFS4_SECINFO_STYLE4_PARENT:
 816                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 817                 if (err)
 818                         return err;
 819                 break;
 820         default:
 821                 return nfserr_inval;
 822         }
 823         exp_get(cstate->current_fh.fh_export);
 824         sin->sin_exp = cstate->current_fh.fh_export;
 825         fh_put(&cstate->current_fh);
 826         return nfs_ok;
 827 }
 828
 829 static __be32
 830 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 831               struct nfsd4_setattr *setattr)
 832 {
 833         __be32 status = nfs_ok;
 834
 835         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 836                 nfs4_lock_state();
 837                 status = nfs4_preprocess_stateid_op(cstate,
 838                         &setattr->sa_stateid, WR_STATE, NULL);
 839                 nfs4_unlock_state();
 840                 if (status) {
 841                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 842                         return status;
 843                 }
 844         }
 845         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 846         if (status)
 847                 return status;
 848         status = nfs_ok;
 849
 850         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 851                                     nfsd_attrmask);
 852         if (status)
 853                 goto out;
 854
 855         if (setattr->sa_acl != NULL)
 856                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 857                                             setattr->sa_acl);
 858         if (status)
 859                 goto out;
 860         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 861                                 0, (time_t)0);
 862 out:
 863         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 864         return status;
 865 }
 866
 867 static __be32
 868 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 869             struct nfsd4_write *write)
 870 {
 871         stateid_t *stateid = &write->wr_stateid;
 872         struct file *filp = NULL;
 873         u32 *p;
 874         __be32 status = nfs_ok;
 875         unsigned long cnt;
 876
 877         /* no need to check permission - this will be done in nfsd_write() */
 878
 879         if (write->wr_offset >= OFFSET_MAX)
 880                 return nfserr_inval;
 881
 882         nfs4_lock_state();
 883         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 884         if (filp)
 885                 get_file(filp);
 886         nfs4_unlock_state();
 887
 888         if (status) {
 889                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 890                 return status;
 891         }
 892
 893         cnt = write->wr_buflen;
 894         write->wr_how_written = write->wr_stable_how;
 895         p = (u32 *)write->wr_verifier.data;
 896         *p++ = nfssvc_boot.tv_sec;
 897         *p++ = nfssvc_boot.tv_usec;
 898
 899         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 900                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 901                              &cnt, &write->wr_how_written);
 902         if (filp)
 903                 fput(filp);
 904
 905         write->wr_bytes_written = cnt;
 906
 907         return status;
 908 }
 909
 910 /* This routine never returns NFS_OK!  If there are no other errors, it
 911  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 912  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 913  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 914  */
 915 static __be32
 916 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 917              struct nfsd4_verify *verify)
 918 {
 919         __be32 *buf, *p;
 920         int count;
 921         __be32 status;
 922
 923         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 924         if (status)
 925                 return status;
 926
 927         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 928         if (status)
 929                 return status;
 930
 931         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 932             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 933                 return nfserr_inval;
 934         if (verify->ve_attrlen & 3)
 935                 return nfserr_inval;
 936
 937         /* count in words:
 938          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 939          */
 940         count = 4 + (verify->ve_attrlen >> 2);
 941         buf = kmalloc(count << 2, GFP_KERNEL);
 942         if (!buf)
 943                 return nfserr_jukebox;
 944
 945         status = nfsd4_encode_fattr(&cstate->current_fh,
 946                                     cstate->current_fh.fh_export,
 947                                     cstate->current_fh.fh_dentry, buf,
 948                                     &count, verify->ve_bmval,
 949                                     rqstp, 0);
 950
 951         /* this means that nfsd4_encode_fattr() ran out of space */
 952         if (status == nfserr_resource && count == 0)
 953                 status = nfserr_not_same;
 954         if (status)
 955                 goto out_kfree;
 956
 957         /* skip bitmap */
 958         p = buf + 1 + ntohl(buf[0]);
 959         status = nfserr_not_same;
 960         if (ntohl(*p++) != verify->ve_attrlen)
 961                 goto out_kfree;
 962         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 963                 status = nfserr_same;
 964
 965 out_kfree:
 966         kfree(buf);
 967         return status;
 968 }
 969
 970 static __be32
 971 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 972               struct nfsd4_verify *verify)
 973 {
 974         __be32 status;
 975
 976         status = _nfsd4_verify(rqstp, cstate, verify);
 977         return status == nfserr_not_same ? nfs_ok : status;
 978 }
 979
 980 static __be32
 981 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 982              struct nfsd4_verify *verify)
 983 {
 984         __be32 status;
 985
 986         status = _nfsd4_verify(rqstp, cstate, verify);
 987         return status == nfserr_same ? nfs_ok : status;
 988 }
 989
 990 /*
 991  * NULL call.
 992  */
 993 static __be32
 994 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 995 {
 996         return nfs_ok;
 997 }
 998
 999 static inline void nfsd4_increment_op_stats(u32 opnum)
1000 {
1001         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1002                 nfsdstats.nfs4_opcount[opnum]++;
1003 }
1004
1005 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1006                               void *);
1007 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1008
1009 enum nfsd4_op_flags {
1010         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1011         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1012         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1013         /* For rfc 5661 section 2.6.3.1.1: */
1014         OP_HANDLES_WRONGSEC = 1 << 3,
1015         OP_IS_PUTFH_LIKE = 1 << 4,
1016         /*
1017          * These are the ops whose result size we estimate before
1018          * encoding, to avoid performing an op then not being able to
1019          * respond or cache a response.  This includes writes and setattrs
1020          * as well as the operations usually called "nonidempotent":
1021          */
1022         OP_MODIFIES_SOMETHING = 1 << 5,
1023         /*
1024          * Cache compounds containing these ops in the xid-based drc:
1025          * We use the DRC for compounds containing non-idempotent
1026          * operations, *except* those that are 4.1-specific (since
1027          * sessions provide their own EOS), and except for stateful
1028          * operations other than setclientid and setclientid_confirm
1029          * (since sequence numbers provide EOS for open, lock, etc in
1030          * the v4.0 case).
1031          */
1032         OP_CACHEME = 1 << 6,
1033 };
1034
1035 struct nfsd4_operation {
1036         nfsd4op_func op_func;
1037         u32 op_flags;
1038         char *op_name;
1039         /* Try to get response size before operation */
1040         nfsd4op_rsize op_rsize_bop;
1041 };
1042
1043 static struct nfsd4_operation nfsd4_ops[];
1044
1045 static const char *nfsd4_op_name(unsigned opnum);
1046
1047 /*
1048  * Enforce NFSv4.1 COMPOUND ordering rules:
1049  *
1050  * Also note, enforced elsewhere:
1051  *      - SEQUENCE other than as first op results in
1052  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1053  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1054  *        (Enforced in nfsd4_bind_conn_to_session().)
1055  *      - DESTROY_SESSION must be the final operation in a compound, if
1056  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1057  *        (Enforced in nfsd4_destroy_session().)
1058  */
1059 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1060 {
1061         struct nfsd4_op *op = &args->ops[0];
1062
1063         /* These ordering requirements don't apply to NFSv4.0: */
1064         if (args->minorversion == 0)
1065                 return nfs_ok;
1066         /* This is weird, but OK, not our problem: */
1067         if (args->opcnt == 0)
1068                 return nfs_ok;
1069         if (op->status == nfserr_op_illegal)
1070                 return nfs_ok;
1071         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1072                 return nfserr_op_not_in_session;
1073         if (op->opnum == OP_SEQUENCE)
1074                 return nfs_ok;
1075         if (args->opcnt != 1)
1076                 return nfserr_not_only_op;
1077         return nfs_ok;
1078 }
1079
1080 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1081 {
1082         return &nfsd4_ops[op->opnum];
1083 }
1084
1085 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1086 {
1087         return OPDESC(op)->op_flags & OP_CACHEME;
1088 }
1089
1090 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1091 {
1092         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1093         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1094         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1095         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1096         struct nfsd4_operation *thisd;
1097         struct nfsd4_operation *nextd;
1098
1099         thisd = OPDESC(this);
1100         /*
1101          * Most ops check wronsec on our own; only the putfh-like ops
1102          * have special rules.
1103          */
1104         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1105                 return false;
1106         /*
1107          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1108          * put-filehandle operation if we're not going to use the
1109          * result:
1110          */
1111         if (argp->opcnt == resp->opcnt)
1112                 return false;
1113
1114         nextd = OPDESC(next);
1115         /*
1116          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1117          * errors themselves as necessary; others should check for them
1118          * now:
1119          */
1120         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1121 }
1122
1123 /*
1124  * COMPOUND call.
1125  */
1126 static __be32
1127 nfsd4_proc_compound(struct svc_rqst *rqstp,
1128                     struct nfsd4_compoundargs *args,
1129                     struct nfsd4_compoundres *resp)
1130 {
1131         struct nfsd4_op *op;
1132         struct nfsd4_operation *opdesc;
1133         struct nfsd4_compound_state *cstate = &resp->cstate;
1134         int             slack_bytes;
1135         u32             plen = 0;
1136         __be32          status;
1137
1138         resp->xbuf = &rqstp->rq_res;
1139         resp->p = rqstp->rq_res.head[0].iov_base +
1140                                                 rqstp->rq_res.head[0].iov_len;
1141         resp->tagp = resp->p;
1142         /* reserve space for: taglen, tag, and opcnt */
1143         resp->p += 2 + XDR_QUADLEN(args->taglen);
1144         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1145         resp->taglen = args->taglen;
1146         resp->tag = args->tag;
1147         resp->opcnt = 0;
1148         resp->rqstp = rqstp;
1149         resp->cstate.minorversion = args->minorversion;
1150         resp->cstate.replay_owner = NULL;
1151         resp->cstate.session = NULL;
1152         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1153         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1154         /*
1155          * Don't use the deferral mechanism for NFSv4; compounds make it
1156          * too hard to avoid non-idempotency problems.
1157          */
1158         rqstp->rq_usedeferral = 0;
1159
1160         /*
1161          * According to RFC3010, this takes precedence over all other errors.
1162          */
1163         status = nfserr_minor_vers_mismatch;
1164         if (args->minorversion > nfsd_supported_minorversion)
1165                 goto out;
1166
1167         status = nfs41_check_op_ordering(args);
1168         if (status) {
1169                 op = &args->ops[0];
1170                 op->status = status;
1171                 goto encode_op;
1172         }
1173
1174         while (!status && resp->opcnt < args->opcnt) {
1175                 op = &args->ops[resp->opcnt++];
1176
1177                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1178                         resp->opcnt, args->opcnt, op->opnum,
1179                         nfsd4_op_name(op->opnum));
1180                 /*
1181                  * The XDR decode routines may have pre-set op->status;
1182                  * for example, if there is a miscellaneous XDR error
1183                  * it will be set to nfserr_bad_xdr.
1184                  */
1185                 if (op->status)
1186                         goto encode_op;
1187
1188                 /* We must be able to encode a successful response to
1189                  * this operation, with enough room left over to encode a
1190                  * failed response to the next operation.  If we don't
1191                  * have enough room, fail with ERR_RESOURCE.
1192                  */
1193                 slack_bytes = (char *)resp->end - (char *)resp->p;
1194                 if (slack_bytes < COMPOUND_SLACK_SPACE
1195                                 + COMPOUND_ERR_SLACK_SPACE) {
1196                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1197                         op->status = nfserr_resource;
1198                         goto encode_op;
1199                 }
1200
1201                 opdesc = OPDESC(op);
1202
1203                 if (!cstate->current_fh.fh_dentry) {
1204                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1205                                 op->status = nfserr_nofilehandle;
1206                                 goto encode_op;
1207                         }
1208                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1209                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1210                         op->status = nfserr_moved;
1211                         goto encode_op;
1212                 }
1213
1214                 /* If op is non-idempotent */
1215                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1216                         plen = opdesc->op_rsize_bop(rqstp, op);
1217                         op->status = nfsd4_check_resp_size(resp, plen);
1218                 }
1219
1220                 if (op->status)
1221                         goto encode_op;
1222
1223                 if (opdesc->op_func)
1224                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1225                 else
1226                         BUG_ON(op->status == nfs_ok);
1227
1228                 if (!op->status && need_wrongsec_check(rqstp))
1229                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1230
1231 encode_op:
1232                 /* Only from SEQUENCE */
1233                 if (resp->cstate.status == nfserr_replay_cache) {
1234                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1235                         status = op->status;
1236                         goto out;
1237                 }
1238                 if (op->status == nfserr_replay_me) {
1239                         op->replay = &cstate->replay_owner->so_replay;
1240                         nfsd4_encode_replay(resp, op);
1241                         status = op->status = op->replay->rp_status;
1242                 } else {
1243                         nfsd4_encode_operation(resp, op);
1244                         status = op->status;
1245                 }
1246
1247                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1248                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1249                         be32_to_cpu(status));
1250
1251                 if (cstate->replay_owner) {
1252                         nfs4_unlock_state();
1253                         cstate->replay_owner = NULL;
1254                 }
1255                 /* XXX Ugh, we need to get rid of this kind of special case: */
1256                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1257                         fput(op->u.read.rd_filp);
1258
1259                 nfsd4_increment_op_stats(op->opnum);
1260         }
1261
1262         resp->cstate.status = status;
1263         fh_put(&resp->cstate.current_fh);
1264         fh_put(&resp->cstate.save_fh);
1265         BUG_ON(resp->cstate.replay_owner);
1266 out:
1267         /* Reset deferral mechanism for RPC deferrals */
1268         rqstp->rq_usedeferral = 1;
1269         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1270         return status;
1271 }
1272
1273 #define op_encode_hdr_size              (2)
1274 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1275 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1276 #define op_encode_change_info_maxsz     (5)
1277 #define nfs4_fattr_bitmap_maxsz         (4)
1278
1279 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1280 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1281
1282 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1283
1284 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1285 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1286                                          op_encode_ace_maxsz)
1287
1288 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1289
1290 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1291 {
1292         return (op_encode_hdr_size) * sizeof(__be32);
1293 }
1294
1295 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1296 {
1297         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1298 }
1299
1300 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1301 {
1302         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1303 }
1304
1305 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1306 {
1307         return (op_encode_hdr_size + op_encode_change_info_maxsz
1308                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1309 }
1310
1311 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1312 {
1313         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1314                 * sizeof(__be32);
1315 }
1316
1317 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1318 {
1319         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1320                 * sizeof(__be32);
1321 }
1322
1323 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1324 {
1325         return (op_encode_hdr_size + op_encode_stateid_maxsz
1326                 + op_encode_change_info_maxsz + 1
1327                 + nfs4_fattr_bitmap_maxsz
1328                 + op_encode_delegation_maxsz) * sizeof(__be32);
1329 }
1330
1331 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1332 {
1333         u32 maxcount = 0, rlen = 0;
1334
1335         maxcount = svc_max_payload(rqstp);
1336         rlen = op->u.read.rd_length;
1337
1338         if (rlen > maxcount)
1339                 rlen = maxcount;
1340
1341         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1342 }
1343
1344 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1345 {
1346         u32 rlen = op->u.readdir.rd_maxcount;
1347
1348         if (rlen > PAGE_SIZE)
1349                 rlen = PAGE_SIZE;
1350
1351         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1352                  * sizeof(__be32) + rlen;
1353 }
1354
1355 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1356 {
1357         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1358                 * sizeof(__be32);
1359 }
1360
1361 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1362 {
1363         return (op_encode_hdr_size + op_encode_change_info_maxsz
1364                 + op_encode_change_info_maxsz) * sizeof(__be32);
1365 }
1366
1367 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1368 {
1369         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1370 }
1371
1372 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1373 {
1374         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1375 }
1376
1377 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1378 {
1379         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1380 }
1381
1382 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1383 {
1384         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1385                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1386                 2 + /*eir_server_owner.so_minor_id */\
1387                 /* eir_server_owner.so_major_id<> */\
1388                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1389                 /* eir_server_scope<> */\
1390                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1391                 1 + /* eir_server_impl_id array length */\
1392                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1393 }
1394
1395 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1396 {
1397         return (op_encode_hdr_size + \
1398                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1399                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1400 }
1401
1402 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1403 {
1404         return (op_encode_hdr_size + \
1405                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1406                 2 + /* csr_sequence, csr_flags */\
1407                 op_encode_channel_attrs_maxsz + \
1408                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1409 }
1410
1411 static struct nfsd4_operation nfsd4_ops[] = {
1412         [OP_ACCESS] = {
1413                 .op_func = (nfsd4op_func)nfsd4_access,
1414                 .op_name = "OP_ACCESS",
1415         },
1416         [OP_CLOSE] = {
1417                 .op_func = (nfsd4op_func)nfsd4_close,
1418                 .op_flags = OP_MODIFIES_SOMETHING,
1419                 .op_name = "OP_CLOSE",
1420                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1421         },
1422         [OP_COMMIT] = {
1423                 .op_func = (nfsd4op_func)nfsd4_commit,
1424                 .op_flags = OP_MODIFIES_SOMETHING,
1425                 .op_name = "OP_COMMIT",
1426                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1427         },
1428         [OP_CREATE] = {
1429                 .op_func = (nfsd4op_func)nfsd4_create,
1430                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1431                 .op_name = "OP_CREATE",
1432                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1433         },
1434         [OP_DELEGRETURN] = {
1435                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1436                 .op_flags = OP_MODIFIES_SOMETHING,
1437                 .op_name = "OP_DELEGRETURN",
1438                 .op_rsize_bop = nfsd4_only_status_rsize,
1439         },
1440         [OP_GETATTR] = {
1441                 .op_func = (nfsd4op_func)nfsd4_getattr,
1442                 .op_flags = ALLOWED_ON_ABSENT_FS,
1443                 .op_name = "OP_GETATTR",
1444         },
1445         [OP_GETFH] = {
1446                 .op_func = (nfsd4op_func)nfsd4_getfh,
1447                 .op_name = "OP_GETFH",
1448         },
1449         [OP_LINK] = {
1450                 .op_func = (nfsd4op_func)nfsd4_link,
1451                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1452                                 | OP_CACHEME,
1453                 .op_name = "OP_LINK",
1454                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1455         },
1456         [OP_LOCK] = {
1457                 .op_func = (nfsd4op_func)nfsd4_lock,
1458                 .op_flags = OP_MODIFIES_SOMETHING,
1459                 .op_name = "OP_LOCK",
1460                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1461         },
1462         [OP_LOCKT] = {
1463                 .op_func = (nfsd4op_func)nfsd4_lockt,
1464                 .op_name = "OP_LOCKT",
1465         },
1466         [OP_LOCKU] = {
1467                 .op_func = (nfsd4op_func)nfsd4_locku,
1468                 .op_flags = OP_MODIFIES_SOMETHING,
1469                 .op_name = "OP_LOCKU",
1470                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1471         },
1472         [OP_LOOKUP] = {
1473                 .op_func = (nfsd4op_func)nfsd4_lookup,
1474                 .op_flags = OP_HANDLES_WRONGSEC,
1475                 .op_name = "OP_LOOKUP",
1476         },
1477         [OP_LOOKUPP] = {
1478                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1479                 .op_flags = OP_HANDLES_WRONGSEC,
1480                 .op_name = "OP_LOOKUPP",
1481         },
1482         [OP_NVERIFY] = {
1483                 .op_func = (nfsd4op_func)nfsd4_nverify,
1484                 .op_name = "OP_NVERIFY",
1485         },
1486         [OP_OPEN] = {
1487                 .op_func = (nfsd4op_func)nfsd4_open,
1488                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1489                 .op_name = "OP_OPEN",
1490                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1491         },
1492         [OP_OPEN_CONFIRM] = {
1493                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1494                 .op_flags = OP_MODIFIES_SOMETHING,
1495                 .op_name = "OP_OPEN_CONFIRM",
1496                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1497         },
1498         [OP_OPEN_DOWNGRADE] = {
1499                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1500                 .op_flags = OP_MODIFIES_SOMETHING,
1501                 .op_name = "OP_OPEN_DOWNGRADE",
1502                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1503         },
1504         [OP_PUTFH] = {
1505                 .op_func = (nfsd4op_func)nfsd4_putfh,
1506                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1507                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1508                 .op_name = "OP_PUTFH",
1509                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1510         },
1511         [OP_PUTPUBFH] = {
1512                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1513                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1514                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1515                 .op_name = "OP_PUTPUBFH",
1516                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1517         },
1518         [OP_PUTROOTFH] = {
1519                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1520                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1521                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1522                 .op_name = "OP_PUTROOTFH",
1523                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1524         },
1525         [OP_READ] = {
1526                 .op_func = (nfsd4op_func)nfsd4_read,
1527                 .op_flags = OP_MODIFIES_SOMETHING,
1528                 .op_name = "OP_READ",
1529                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1530         },
1531         [OP_READDIR] = {
1532                 .op_func = (nfsd4op_func)nfsd4_readdir,
1533                 .op_flags = OP_MODIFIES_SOMETHING,
1534                 .op_name = "OP_READDIR",
1535                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1536         },
1537         [OP_READLINK] = {
1538                 .op_func = (nfsd4op_func)nfsd4_readlink,
1539                 .op_name = "OP_READLINK",
1540         },
1541         [OP_REMOVE] = {
1542                 .op_func = (nfsd4op_func)nfsd4_remove,
1543                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1544                 .op_name = "OP_REMOVE",
1545                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1546         },
1547         [OP_RENAME] = {
1548                 .op_func = (nfsd4op_func)nfsd4_rename,
1549                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1550                 .op_name = "OP_RENAME",
1551                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1552         },
1553         [OP_RENEW] = {
1554                 .op_func = (nfsd4op_func)nfsd4_renew,
1555                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1556                                 | OP_MODIFIES_SOMETHING,
1557                 .op_name = "OP_RENEW",
1558                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1559
1560         },
1561         [OP_RESTOREFH] = {
1562                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1563                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1564                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1565                 .op_name = "OP_RESTOREFH",
1566                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1567         },
1568         [OP_SAVEFH] = {
1569                 .op_func = (nfsd4op_func)nfsd4_savefh,
1570                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1571                 .op_name = "OP_SAVEFH",
1572                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1573         },
1574         [OP_SECINFO] = {
1575                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1576                 .op_flags = OP_HANDLES_WRONGSEC,
1577                 .op_name = "OP_SECINFO",
1578         },
1579         [OP_SETATTR] = {
1580                 .op_func = (nfsd4op_func)nfsd4_setattr,
1581                 .op_name = "OP_SETATTR",
1582                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1583                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1584         },
1585         [OP_SETCLIENTID] = {
1586                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1587                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1588                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1589                 .op_name = "OP_SETCLIENTID",
1590                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1591         },
1592         [OP_SETCLIENTID_CONFIRM] = {
1593                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1594                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1595                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1596                 .op_name = "OP_SETCLIENTID_CONFIRM",
1597                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1598         },
1599         [OP_VERIFY] = {
1600                 .op_func = (nfsd4op_func)nfsd4_verify,
1601                 .op_name = "OP_VERIFY",
1602         },
1603         [OP_WRITE] = {
1604                 .op_func = (nfsd4op_func)nfsd4_write,
1605                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1606                 .op_name = "OP_WRITE",
1607                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1608         },
1609         [OP_RELEASE_LOCKOWNER] = {
1610                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1611                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1612                                 | OP_MODIFIES_SOMETHING,
1613                 .op_name = "OP_RELEASE_LOCKOWNER",
1614                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1615         },
1616
1617         /* NFSv4.1 operations */
1618         [OP_EXCHANGE_ID] = {
1619                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1620                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1621                                 | OP_MODIFIES_SOMETHING,
1622                 .op_name = "OP_EXCHANGE_ID",
1623                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1624         },
1625         [OP_BIND_CONN_TO_SESSION] = {
1626                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1627                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1628                                 | OP_MODIFIES_SOMETHING,
1629                 .op_name = "OP_BIND_CONN_TO_SESSION",
1630                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1631         },
1632         [OP_CREATE_SESSION] = {
1633                 .op_func = (nfsd4op_func)nfsd4_create_session,
1634                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1635                                 | OP_MODIFIES_SOMETHING,
1636                 .op_name = "OP_CREATE_SESSION",
1637                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1638         },
1639         [OP_DESTROY_SESSION] = {
1640                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1641                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1642                                 | OP_MODIFIES_SOMETHING,
1643                 .op_name = "OP_DESTROY_SESSION",
1644                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1645         },
1646         [OP_SEQUENCE] = {
1647                 .op_func = (nfsd4op_func)nfsd4_sequence,
1648                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1649                 .op_name = "OP_SEQUENCE",
1650         },
1651         [OP_DESTROY_CLIENTID] = {
1652                 .op_func = NULL,
1653                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1654                                 | OP_MODIFIES_SOMETHING,
1655                 .op_name = "OP_DESTROY_CLIENTID",
1656                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1657         },
1658         [OP_RECLAIM_COMPLETE] = {
1659                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1660                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1661                 .op_name = "OP_RECLAIM_COMPLETE",
1662                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1663         },
1664         [OP_SECINFO_NO_NAME] = {
1665                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1666                 .op_flags = OP_HANDLES_WRONGSEC,
1667                 .op_name = "OP_SECINFO_NO_NAME",
1668         },
1669         [OP_TEST_STATEID] = {
1670                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1671                 .op_flags = ALLOWED_WITHOUT_FH,
1672                 .op_name = "OP_TEST_STATEID",
1673         },
1674         [OP_FREE_STATEID] = {
1675                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1676                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1677                 .op_name = "OP_FREE_STATEID",
1678                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1679         },
1680 };
1681
1682 static const char *nfsd4_op_name(unsigned opnum)
1683 {
1684         if (opnum < ARRAY_SIZE(nfsd4_ops))
1685                 return nfsd4_ops[opnum].op_name;
1686         return "unknown_operation";
1687 }
1688
1689 #define nfsd4_voidres                   nfsd4_voidargs
1690 struct nfsd4_voidargs { int dummy; };
1691
1692 static struct svc_procedure             nfsd_procedures4[2] = {
1693         [NFSPROC4_NULL] = {
1694                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1695                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1696                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1697                 .pc_ressize = sizeof(struct nfsd4_voidres),
1698                 .pc_cachetype = RC_NOCACHE,
1699                 .pc_xdrressize = 1,
1700         },
1701         [NFSPROC4_COMPOUND] = {
1702                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1703                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1704                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1705                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1706                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1707                 .pc_release = nfsd4_release_compoundargs,
1708                 .pc_cachetype = RC_NOCACHE,
1709                 .pc_xdrressize = NFSD_BUFSIZE/4,
1710         },
1711 };
1712
1713 struct svc_version      nfsd_version4 = {
1714                 .vs_vers        = 4,
1715                 .vs_nproc       = 2,
1716                 .vs_proc        = nfsd_procedures4,
1717                 .vs_dispatch    = nfsd_dispatch,
1718                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1719 };
1720
1721 /*
1722  * Local variables:
1723  *  c-basic-offset: 8
1724  * End:
1725  */