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         int accmode;
 197         __be32 status;
 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, &open->op_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         }
 241         if (status)
 242                 goto out;
 243         status = nfsd_check_obj_isreg(&resfh);
 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         accmode = NFSD_MAY_NOP;
 257         if (open->op_created)
 258                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 259         status = do_open_permission(rqstp, current_fh, open, accmode);
 260
 261 out:
 262         fh_put(&resfh);
 263         return status;
 264 }
 265
 266 static __be32
 267 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 268 {
 269         __be32 status;
 270
 271         /* Only reclaims from previously confirmed clients are valid */
 272         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 273                 return status;
 274
 275         /* We don't know the target directory, and therefore can not
 276         * set the change info
 277         */
 278
 279         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 280
 281         /* set replay cache */
 282         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 283                         &current_fh->fh_handle);
 284
 285         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 286                 (open->op_iattr.ia_size == 0);
 287
 288         status = do_open_permission(rqstp, current_fh, open,
 289                                     NFSD_MAY_OWNER_OVERRIDE);
 290
 291         return status;
 292 }
 293
 294 static void
 295 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 296 {
 297         struct nfsd4_sessionid *sid =
 298                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 299
 300         clid->cl_boot = sid->clientid.cl_boot;
 301         clid->cl_id = sid->clientid.cl_id;
 302 }
 303
 304 static __be32
 305 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 306            struct nfsd4_open *open)
 307 {
 308         __be32 status;
 309         struct nfsd4_compoundres *resp;
 310
 311         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 312                 (int)open->op_fname.len, open->op_fname.data,
 313                 open->op_openowner);
 314
 315         /* This check required by spec. */
 316         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 317                 return nfserr_inval;
 318
 319         /* We don't yet support WANT bits: */
 320         open->op_share_access &= NFS4_SHARE_ACCESS_MASK;
 321
 322         open->op_created = 0;
 323         /*
 324          * RFC5661 18.51.3
 325          * Before RECLAIM_COMPLETE done, server should deny new lock
 326          */
 327         if (nfsd4_has_session(cstate) &&
 328             !cstate->session->se_client->cl_firststate &&
 329             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 330                 return nfserr_grace;
 331
 332         if (nfsd4_has_session(cstate))
 333                 copy_clientid(&open->op_clientid, cstate->session);
 334
 335         nfs4_lock_state();
 336
 337         /* check seqid for replay. set nfs4_owner */
 338         resp = rqstp->rq_resp;
 339         status = nfsd4_process_open1(&resp->cstate, open);
 340         if (status == nfserr_replay_me) {
 341                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 342                 fh_put(&cstate->current_fh);
 343                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 344                                 &rp->rp_openfh);
 345                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 346                 if (status)
 347                         dprintk("nfsd4_open: replay failed"
 348                                 " restoring previous filehandle\n");
 349                 else
 350                         status = nfserr_replay_me;
 351         }
 352         if (status)
 353                 goto out;
 354
 355         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 356         if (status)
 357                 goto out;
 358
 359         /* Openowner is now set, so sequence id will get bumped.  Now we need
 360          * these checks before we do any creates: */
 361         status = nfserr_grace;
 362         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 363                 goto out;
 364         status = nfserr_no_grace;
 365         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 366                 goto out;
 367
 368         switch (open->op_claim_type) {
 369                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 370                 case NFS4_OPEN_CLAIM_NULL:
 371                         status = do_open_lookup(rqstp, &cstate->current_fh,
 372                                                 open);
 373                         if (status)
 374                                 goto out;
 375                         break;
 376                 case NFS4_OPEN_CLAIM_PREVIOUS:
 377                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 378                 case NFS4_OPEN_CLAIM_FH:
 379                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 380                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 381                                                  open);
 382                         if (status)
 383                                 goto out;
 384                         break;
 385                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 386                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 387                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 388                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 389                                 open->op_claim_type);
 390                         status = nfserr_notsupp;
 391                         goto out;
 392                 default:
 393                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 394                                 open->op_claim_type);
 395                         status = nfserr_inval;
 396                         goto out;
 397         }
 398         /*
 399          * nfsd4_process_open2() does the actual opening of the file.  If
 400          * successful, it (1) truncates the file if open->op_truncate was
 401          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 402          */
 403         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 404         WARN_ON(status && open->op_created);
 405 out:
 406         nfsd4_cleanup_open_state(open, status);
 407         if (open->op_openowner)
 408                 cstate->replay_owner = &open->op_openowner->oo_owner;
 409         else
 410                 nfs4_unlock_state();
 411         return status;
 412 }
 413
 414 /*
 415  * filehandle-manipulating ops.
 416  */
 417 static __be32
 418 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 419             struct svc_fh **getfh)
 420 {
 421         if (!cstate->current_fh.fh_dentry)
 422                 return nfserr_nofilehandle;
 423
 424         *getfh = &cstate->current_fh;
 425         return nfs_ok;
 426 }
 427
 428 static __be32
 429 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 430             struct nfsd4_putfh *putfh)
 431 {
 432         fh_put(&cstate->current_fh);
 433         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 434         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 435                putfh->pf_fhlen);
 436         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 437 }
 438
 439 static __be32
 440 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 441                 void *arg)
 442 {
 443         __be32 status;
 444
 445         fh_put(&cstate->current_fh);
 446         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 447         return status;
 448 }
 449
 450 static __be32
 451 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 452                 void *arg)
 453 {
 454         if (!cstate->save_fh.fh_dentry)
 455                 return nfserr_restorefh;
 456
 457         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 458         return nfs_ok;
 459 }
 460
 461 static __be32
 462 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 463              void *arg)
 464 {
 465         if (!cstate->current_fh.fh_dentry)
 466                 return nfserr_nofilehandle;
 467
 468         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 469         return nfs_ok;
 470 }
 471
 472 /*
 473  * misc nfsv4 ops
 474  */
 475 static __be32
 476 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 477              struct nfsd4_access *access)
 478 {
 479         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 480                 return nfserr_inval;
 481
 482         access->ac_resp_access = access->ac_req_access;
 483         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 484                            &access->ac_supported);
 485 }
 486
 487 static __be32
 488 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 489              struct nfsd4_commit *commit)
 490 {
 491         u32 *p = (u32 *)commit->co_verf.data;
 492         *p++ = nfssvc_boot.tv_sec;
 493         *p++ = nfssvc_boot.tv_usec;
 494
 495         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 496                              commit->co_count);
 497 }
 498
 499 static __be32
 500 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 501              struct nfsd4_create *create)
 502 {
 503         struct svc_fh resfh;
 504         __be32 status;
 505         dev_t rdev;
 506
 507         fh_init(&resfh, NFS4_FHSIZE);
 508
 509         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 510                            NFSD_MAY_CREATE);
 511         if (status)
 512                 return status;
 513
 514         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 515                                     nfsd_attrmask);
 516         if (status)
 517                 return status;
 518
 519         switch (create->cr_type) {
 520         case NF4LNK:
 521                 /* ugh! we have to null-terminate the linktext, or
 522                  * vfs_symlink() will choke.  it is always safe to
 523                  * null-terminate by brute force, since at worst we
 524                  * will overwrite the first byte of the create namelen
 525                  * in the XDR buffer, which has already been extracted
 526                  * during XDR decode.
 527                  */
 528                 create->cr_linkname[create->cr_linklen] = 0;
 529
 530                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 531                                       create->cr_name, create->cr_namelen,
 532                                       create->cr_linkname, create->cr_linklen,
 533                                       &resfh, &create->cr_iattr);
 534                 break;
 535
 536         case NF4BLK:
 537                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 538                 if (MAJOR(rdev) != create->cr_specdata1 ||
 539                     MINOR(rdev) != create->cr_specdata2)
 540                         return nfserr_inval;
 541                 status = nfsd_create(rqstp, &cstate->current_fh,
 542                                      create->cr_name, create->cr_namelen,
 543                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 544                 break;
 545
 546         case NF4CHR:
 547                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 548                 if (MAJOR(rdev) != create->cr_specdata1 ||
 549                     MINOR(rdev) != create->cr_specdata2)
 550                         return nfserr_inval;
 551                 status = nfsd_create(rqstp, &cstate->current_fh,
 552                                      create->cr_name, create->cr_namelen,
 553                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 554                 break;
 555
 556         case NF4SOCK:
 557                 status = nfsd_create(rqstp, &cstate->current_fh,
 558                                      create->cr_name, create->cr_namelen,
 559                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 560                 break;
 561
 562         case NF4FIFO:
 563                 status = nfsd_create(rqstp, &cstate->current_fh,
 564                                      create->cr_name, create->cr_namelen,
 565                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 566                 break;
 567
 568         case NF4DIR:
 569                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 570                 status = nfsd_create(rqstp, &cstate->current_fh,
 571                                      create->cr_name, create->cr_namelen,
 572                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 573                 break;
 574
 575         default:
 576                 status = nfserr_badtype;
 577         }
 578
 579         if (status)
 580                 goto out;
 581
 582         if (create->cr_acl != NULL)
 583                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 584                                 create->cr_bmval);
 585
 586         fh_unlock(&cstate->current_fh);
 587         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 588         fh_dup2(&cstate->current_fh, &resfh);
 589 out:
 590         fh_put(&resfh);
 591         return status;
 592 }
 593
 594 static __be32
 595 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 596               struct nfsd4_getattr *getattr)
 597 {
 598         __be32 status;
 599
 600         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 601         if (status)
 602                 return status;
 603
 604         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 605                 return nfserr_inval;
 606
 607         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 608         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 609         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 610
 611         getattr->ga_fhp = &cstate->current_fh;
 612         return nfs_ok;
 613 }
 614
 615 static __be32
 616 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 617            struct nfsd4_link *link)
 618 {
 619         __be32 status = nfserr_nofilehandle;
 620
 621         if (!cstate->save_fh.fh_dentry)
 622                 return status;
 623         status = nfsd_link(rqstp, &cstate->current_fh,
 624                            link->li_name, link->li_namelen, &cstate->save_fh);
 625         if (!status)
 626                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 627         return status;
 628 }
 629
 630 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 631 {
 632         struct svc_fh tmp_fh;
 633         __be32 ret;
 634
 635         fh_init(&tmp_fh, NFS4_FHSIZE);
 636         ret = exp_pseudoroot(rqstp, &tmp_fh);
 637         if (ret)
 638                 return ret;
 639         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 640                 fh_put(&tmp_fh);
 641                 return nfserr_noent;
 642         }
 643         fh_put(&tmp_fh);
 644         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 645 }
 646
 647 static __be32
 648 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 649               void *arg)
 650 {
 651         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 652 }
 653
 654 static __be32
 655 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 656              struct nfsd4_lookup *lookup)
 657 {
 658         return nfsd_lookup(rqstp, &cstate->current_fh,
 659                            lookup->lo_name, lookup->lo_len,
 660                            &cstate->current_fh);
 661 }
 662
 663 static __be32
 664 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 665            struct nfsd4_read *read)
 666 {
 667         __be32 status;
 668
 669         /* no need to check permission - this will be done in nfsd_read() */
 670
 671         read->rd_filp = NULL;
 672         if (read->rd_offset >= OFFSET_MAX)
 673                 return nfserr_inval;
 674
 675         nfs4_lock_state();
 676         /* check stateid */
 677         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 678                                                  RD_STATE, &read->rd_filp))) {
 679                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 680                 goto out;
 681         }
 682         if (read->rd_filp)
 683                 get_file(read->rd_filp);
 684         status = nfs_ok;
 685 out:
 686         nfs4_unlock_state();
 687         read->rd_rqstp = rqstp;
 688         read->rd_fhp = &cstate->current_fh;
 689         return status;
 690 }
 691
 692 static __be32
 693 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 694               struct nfsd4_readdir *readdir)
 695 {
 696         u64 cookie = readdir->rd_cookie;
 697         static const nfs4_verifier zeroverf;
 698
 699         /* no need to check permission - this will be done in nfsd_readdir() */
 700
 701         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 702                 return nfserr_inval;
 703
 704         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 705         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 706         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 707
 708         if ((cookie == 1) || (cookie == 2) ||
 709             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 710                 return nfserr_bad_cookie;
 711
 712         readdir->rd_rqstp = rqstp;
 713         readdir->rd_fhp = &cstate->current_fh;
 714         return nfs_ok;
 715 }
 716
 717 static __be32
 718 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 719                struct nfsd4_readlink *readlink)
 720 {
 721         readlink->rl_rqstp = rqstp;
 722         readlink->rl_fhp = &cstate->current_fh;
 723         return nfs_ok;
 724 }
 725
 726 static __be32
 727 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 728              struct nfsd4_remove *remove)
 729 {
 730         __be32 status;
 731
 732         if (locks_in_grace())
 733                 return nfserr_grace;
 734         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 735                              remove->rm_name, remove->rm_namelen);
 736         if (!status) {
 737                 fh_unlock(&cstate->current_fh);
 738                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 739         }
 740         return status;
 741 }
 742
 743 static __be32
 744 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 745              struct nfsd4_rename *rename)
 746 {
 747         __be32 status = nfserr_nofilehandle;
 748
 749         if (!cstate->save_fh.fh_dentry)
 750                 return status;
 751         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 752                                         & NFSEXP_NOSUBTREECHECK))
 753                 return nfserr_grace;
 754         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 755                              rename->rn_snamelen, &cstate->current_fh,
 756                              rename->rn_tname, rename->rn_tnamelen);
 757
 758         /* the underlying filesystem returns different error's than required
 759          * by NFSv4. both save_fh and current_fh have been verified.. */
 760         if (status == nfserr_isdir)
 761                 status = nfserr_exist;
 762         else if ((status == nfserr_notdir) &&
 763                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 764                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 765                 status = nfserr_exist;
 766
 767         if (!status) {
 768                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 769                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 770         }
 771         return status;
 772 }
 773
 774 static __be32
 775 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 776               struct nfsd4_secinfo *secinfo)
 777 {
 778         struct svc_fh resfh;
 779         struct svc_export *exp;
 780         struct dentry *dentry;
 781         __be32 err;
 782
 783         fh_init(&resfh, NFS4_FHSIZE);
 784         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 785         if (err)
 786                 return err;
 787         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 788                                     secinfo->si_name, secinfo->si_namelen,
 789                                     &exp, &dentry);
 790         if (err)
 791                 return err;
 792         if (dentry->d_inode == NULL) {
 793                 exp_put(exp);
 794                 err = nfserr_noent;
 795         } else
 796                 secinfo->si_exp = exp;
 797         dput(dentry);
 798         if (cstate->minorversion)
 799                 /* See rfc 5661 section 2.6.3.1.1.8 */
 800                 fh_put(&cstate->current_fh);
 801         return err;
 802 }
 803
 804 static __be32
 805 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 806               struct nfsd4_secinfo_no_name *sin)
 807 {
 808         __be32 err;
 809
 810         switch (sin->sin_style) {
 811         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 812                 break;
 813         case NFS4_SECINFO_STYLE4_PARENT:
 814                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 815                 if (err)
 816                         return err;
 817                 break;
 818         default:
 819                 return nfserr_inval;
 820         }
 821         exp_get(cstate->current_fh.fh_export);
 822         sin->sin_exp = cstate->current_fh.fh_export;
 823         fh_put(&cstate->current_fh);
 824         return nfs_ok;
 825 }
 826
 827 static __be32
 828 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 829               struct nfsd4_setattr *setattr)
 830 {
 831         __be32 status = nfs_ok;
 832         int err;
 833
 834         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 835                 nfs4_lock_state();
 836                 status = nfs4_preprocess_stateid_op(cstate,
 837                         &setattr->sa_stateid, WR_STATE, NULL);
 838                 nfs4_unlock_state();
 839                 if (status) {
 840                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 841                         return status;
 842                 }
 843         }
 844         err = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 845         if (err)
 846                 return nfserrno(err);
 847         status = nfs_ok;
 848
 849         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 850                                     nfsd_attrmask);
 851         if (status)
 852                 goto out;
 853
 854         if (setattr->sa_acl != NULL)
 855                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 856                                             setattr->sa_acl);
 857         if (status)
 858                 goto out;
 859         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 860                                 0, (time_t)0);
 861 out:
 862         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 863         return status;
 864 }
 865
 866 static __be32
 867 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 868             struct nfsd4_write *write)
 869 {
 870         stateid_t *stateid = &write->wr_stateid;
 871         struct file *filp = NULL;
 872         u32 *p;
 873         __be32 status = nfs_ok;
 874         unsigned long cnt;
 875
 876         /* no need to check permission - this will be done in nfsd_write() */
 877
 878         if (write->wr_offset >= OFFSET_MAX)
 879                 return nfserr_inval;
 880
 881         nfs4_lock_state();
 882         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 883         if (status) {
 884                 nfs4_unlock_state();
 885                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 886                 return status;
 887         }
 888         if (filp)
 889                 get_file(filp);
 890         nfs4_unlock_state();
 891
 892         cnt = write->wr_buflen;
 893         write->wr_how_written = write->wr_stable_how;
 894         p = (u32 *)write->wr_verifier.data;
 895         *p++ = nfssvc_boot.tv_sec;
 896         *p++ = nfssvc_boot.tv_usec;
 897
 898         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 899                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 900                              &cnt, &write->wr_how_written);
 901         if (filp)
 902                 fput(filp);
 903
 904         write->wr_bytes_written = cnt;
 905
 906         return status;
 907 }
 908
 909 /* This routine never returns NFS_OK!  If there are no other errors, it
 910  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 911  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 912  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 913  */
 914 static __be32
 915 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 916              struct nfsd4_verify *verify)
 917 {
 918         __be32 *buf, *p;
 919         int count;
 920         __be32 status;
 921
 922         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 923         if (status)
 924                 return status;
 925
 926         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 927         if (status)
 928                 return status;
 929
 930         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 931             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 932                 return nfserr_inval;
 933         if (verify->ve_attrlen & 3)
 934                 return nfserr_inval;
 935
 936         /* count in words:
 937          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 938          */
 939         count = 4 + (verify->ve_attrlen >> 2);
 940         buf = kmalloc(count << 2, GFP_KERNEL);
 941         if (!buf)
 942                 return nfserr_jukebox;
 943
 944         status = nfsd4_encode_fattr(&cstate->current_fh,
 945                                     cstate->current_fh.fh_export,
 946                                     cstate->current_fh.fh_dentry, buf,
 947                                     &count, verify->ve_bmval,
 948                                     rqstp, 0);
 949
 950         /* this means that nfsd4_encode_fattr() ran out of space */
 951         if (status == nfserr_resource && count == 0)
 952                 status = nfserr_not_same;
 953         if (status)
 954                 goto out_kfree;
 955
 956         /* skip bitmap */
 957         p = buf + 1 + ntohl(buf[0]);
 958         status = nfserr_not_same;
 959         if (ntohl(*p++) != verify->ve_attrlen)
 960                 goto out_kfree;
 961         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 962                 status = nfserr_same;
 963
 964 out_kfree:
 965         kfree(buf);
 966         return status;
 967 }
 968
 969 static __be32
 970 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 971               struct nfsd4_verify *verify)
 972 {
 973         __be32 status;
 974
 975         status = _nfsd4_verify(rqstp, cstate, verify);
 976         return status == nfserr_not_same ? nfs_ok : status;
 977 }
 978
 979 static __be32
 980 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 981              struct nfsd4_verify *verify)
 982 {
 983         __be32 status;
 984
 985         status = _nfsd4_verify(rqstp, cstate, verify);
 986         return status == nfserr_same ? nfs_ok : status;
 987 }
 988
 989 /*
 990  * NULL call.
 991  */
 992 static __be32
 993 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 994 {
 995         return nfs_ok;
 996 }
 997
 998 static inline void nfsd4_increment_op_stats(u32 opnum)
 999 {
1000         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1001                 nfsdstats.nfs4_opcount[opnum]++;
1002 }
1003
1004 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1005                               void *);
1006 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1007
1008 enum nfsd4_op_flags {
1009         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1010         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1011         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1012         /* For rfc 5661 section 2.6.3.1.1: */
1013         OP_HANDLES_WRONGSEC = 1 << 3,
1014         OP_IS_PUTFH_LIKE = 1 << 4,
1015         /*
1016          * These are the ops whose result size we estimate before
1017          * encoding, to avoid performing an op then not being able to
1018          * respond or cache a response.  This includes writes and setattrs
1019          * as well as the operations usually called "nonidempotent":
1020          */
1021         OP_MODIFIES_SOMETHING = 1 << 5,
1022         /*
1023          * Cache compounds containing these ops in the xid-based drc:
1024          * We use the DRC for compounds containing non-idempotent
1025          * operations, *except* those that are 4.1-specific (since
1026          * sessions provide their own EOS), and except for stateful
1027          * operations other than setclientid and setclientid_confirm
1028          * (since sequence numbers provide EOS for open, lock, etc in
1029          * the v4.0 case).
1030          */
1031         OP_CACHEME = 1 << 6,
1032 };
1033
1034 struct nfsd4_operation {
1035         nfsd4op_func op_func;
1036         u32 op_flags;
1037         char *op_name;
1038         /* Try to get response size before operation */
1039         nfsd4op_rsize op_rsize_bop;
1040 };
1041
1042 static struct nfsd4_operation nfsd4_ops[];
1043
1044 static const char *nfsd4_op_name(unsigned opnum);
1045
1046 /*
1047  * Enforce NFSv4.1 COMPOUND ordering rules:
1048  *
1049  * Also note, enforced elsewhere:
1050  *      - SEQUENCE other than as first op results in
1051  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1052  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1053  *        (Enforced in nfsd4_bind_conn_to_session().)
1054  *      - DESTROY_SESSION must be the final operation in a compound, if
1055  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1056  *        (Enforced in nfsd4_destroy_session().)
1057  */
1058 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1059 {
1060         struct nfsd4_op *op = &args->ops[0];
1061
1062         /* These ordering requirements don't apply to NFSv4.0: */
1063         if (args->minorversion == 0)
1064                 return nfs_ok;
1065         /* This is weird, but OK, not our problem: */
1066         if (args->opcnt == 0)
1067                 return nfs_ok;
1068         if (op->status == nfserr_op_illegal)
1069                 return nfs_ok;
1070         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1071                 return nfserr_op_not_in_session;
1072         if (op->opnum == OP_SEQUENCE)
1073                 return nfs_ok;
1074         if (args->opcnt != 1)
1075                 return nfserr_not_only_op;
1076         return nfs_ok;
1077 }
1078
1079 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1080 {
1081         return &nfsd4_ops[op->opnum];
1082 }
1083
1084 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1085 {
1086         return OPDESC(op)->op_flags & OP_CACHEME;
1087 }
1088
1089 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1090 {
1091         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1092         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1093         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1094         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1095         struct nfsd4_operation *thisd;
1096         struct nfsd4_operation *nextd;
1097
1098         thisd = OPDESC(this);
1099         /*
1100          * Most ops check wronsec on our own; only the putfh-like ops
1101          * have special rules.
1102          */
1103         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1104                 return false;
1105         /*
1106          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1107          * put-filehandle operation if we're not going to use the
1108          * result:
1109          */
1110         if (argp->opcnt == resp->opcnt)
1111                 return false;
1112
1113         nextd = OPDESC(next);
1114         /*
1115          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1116          * errors themselves as necessary; others should check for them
1117          * now:
1118          */
1119         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1120 }
1121
1122 /*
1123  * COMPOUND call.
1124  */
1125 static __be32
1126 nfsd4_proc_compound(struct svc_rqst *rqstp,
1127                     struct nfsd4_compoundargs *args,
1128                     struct nfsd4_compoundres *resp)
1129 {
1130         struct nfsd4_op *op;
1131         struct nfsd4_operation *opdesc;
1132         struct nfsd4_compound_state *cstate = &resp->cstate;
1133         int             slack_bytes;
1134         u32             plen = 0;
1135         __be32          status;
1136
1137         resp->xbuf = &rqstp->rq_res;
1138         resp->p = rqstp->rq_res.head[0].iov_base +
1139                                                 rqstp->rq_res.head[0].iov_len;
1140         resp->tagp = resp->p;
1141         /* reserve space for: taglen, tag, and opcnt */
1142         resp->p += 2 + XDR_QUADLEN(args->taglen);
1143         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1144         resp->taglen = args->taglen;
1145         resp->tag = args->tag;
1146         resp->opcnt = 0;
1147         resp->rqstp = rqstp;
1148         resp->cstate.minorversion = args->minorversion;
1149         resp->cstate.replay_owner = NULL;
1150         resp->cstate.session = NULL;
1151         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1152         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1153         /*
1154          * Don't use the deferral mechanism for NFSv4; compounds make it
1155          * too hard to avoid non-idempotency problems.
1156          */
1157         rqstp->rq_usedeferral = 0;
1158
1159         /*
1160          * According to RFC3010, this takes precedence over all other errors.
1161          */
1162         status = nfserr_minor_vers_mismatch;
1163         if (args->minorversion > nfsd_supported_minorversion)
1164                 goto out;
1165
1166         status = nfs41_check_op_ordering(args);
1167         if (status) {
1168                 op = &args->ops[0];
1169                 op->status = status;
1170                 goto encode_op;
1171         }
1172
1173         while (!status && resp->opcnt < args->opcnt) {
1174                 op = &args->ops[resp->opcnt++];
1175
1176                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1177                         resp->opcnt, args->opcnt, op->opnum,
1178                         nfsd4_op_name(op->opnum));
1179                 /*
1180                  * The XDR decode routines may have pre-set op->status;
1181                  * for example, if there is a miscellaneous XDR error
1182                  * it will be set to nfserr_bad_xdr.
1183                  */
1184                 if (op->status)
1185                         goto encode_op;
1186
1187                 /* We must be able to encode a successful response to
1188                  * this operation, with enough room left over to encode a
1189                  * failed response to the next operation.  If we don't
1190                  * have enough room, fail with ERR_RESOURCE.
1191                  */
1192                 slack_bytes = (char *)resp->end - (char *)resp->p;
1193                 if (slack_bytes < COMPOUND_SLACK_SPACE
1194                                 + COMPOUND_ERR_SLACK_SPACE) {
1195                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1196                         op->status = nfserr_resource;
1197                         goto encode_op;
1198                 }
1199
1200                 opdesc = OPDESC(op);
1201
1202                 if (!cstate->current_fh.fh_dentry) {
1203                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1204                                 op->status = nfserr_nofilehandle;
1205                                 goto encode_op;
1206                         }
1207                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1208                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1209                         op->status = nfserr_moved;
1210                         goto encode_op;
1211                 }
1212
1213                 /* If op is non-idempotent */
1214                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1215                         plen = opdesc->op_rsize_bop(rqstp, op);
1216                         op->status = nfsd4_check_resp_size(resp, plen);
1217                 }
1218
1219                 if (op->status)
1220                         goto encode_op;
1221
1222                 if (opdesc->op_func)
1223                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1224                 else
1225                         BUG_ON(op->status == nfs_ok);
1226
1227                 if (!op->status && need_wrongsec_check(rqstp))
1228                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1229
1230 encode_op:
1231                 /* Only from SEQUENCE */
1232                 if (resp->cstate.status == nfserr_replay_cache) {
1233                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1234                         status = op->status;
1235                         goto out;
1236                 }
1237                 if (op->status == nfserr_replay_me) {
1238                         op->replay = &cstate->replay_owner->so_replay;
1239                         nfsd4_encode_replay(resp, op);
1240                         status = op->status = op->replay->rp_status;
1241                 } else {
1242                         nfsd4_encode_operation(resp, op);
1243                         status = op->status;
1244                 }
1245
1246                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1247                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1248                         be32_to_cpu(status));
1249
1250                 if (cstate->replay_owner) {
1251                         nfs4_unlock_state();
1252                         cstate->replay_owner = NULL;
1253                 }
1254                 /* XXX Ugh, we need to get rid of this kind of special case: */
1255                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1256                         fput(op->u.read.rd_filp);
1257
1258                 nfsd4_increment_op_stats(op->opnum);
1259         }
1260
1261         resp->cstate.status = status;
1262         fh_put(&resp->cstate.current_fh);
1263         fh_put(&resp->cstate.save_fh);
1264         BUG_ON(resp->cstate.replay_owner);
1265 out:
1266         /* Reset deferral mechanism for RPC deferrals */
1267         rqstp->rq_usedeferral = 1;
1268         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1269         return status;
1270 }
1271
1272 #define op_encode_hdr_size              (2)
1273 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1274 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1275 #define op_encode_change_info_maxsz     (5)
1276 #define nfs4_fattr_bitmap_maxsz         (4)
1277
1278 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1279 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1280
1281 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1282
1283 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1284 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1285                                          op_encode_ace_maxsz)
1286
1287 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1288
1289 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1290 {
1291         return (op_encode_hdr_size) * sizeof(__be32);
1292 }
1293
1294 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1295 {
1296         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1297 }
1298
1299 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1300 {
1301         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1302 }
1303
1304 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1305 {
1306         return (op_encode_hdr_size + op_encode_change_info_maxsz
1307                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1308 }
1309
1310 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1311 {
1312         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1313                 * sizeof(__be32);
1314 }
1315
1316 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1317 {
1318         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1319                 * sizeof(__be32);
1320 }
1321
1322 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1323 {
1324         return (op_encode_hdr_size + op_encode_stateid_maxsz
1325                 + op_encode_change_info_maxsz + 1
1326                 + nfs4_fattr_bitmap_maxsz
1327                 + op_encode_delegation_maxsz) * sizeof(__be32);
1328 }
1329
1330 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1331 {
1332         u32 maxcount = 0, rlen = 0;
1333
1334         maxcount = svc_max_payload(rqstp);
1335         rlen = op->u.read.rd_length;
1336
1337         if (rlen > maxcount)
1338                 rlen = maxcount;
1339
1340         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1341 }
1342
1343 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1344 {
1345         u32 rlen = op->u.readdir.rd_maxcount;
1346
1347         if (rlen > PAGE_SIZE)
1348                 rlen = PAGE_SIZE;
1349
1350         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1351                  * sizeof(__be32) + rlen;
1352 }
1353
1354 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1355 {
1356         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1357                 * sizeof(__be32);
1358 }
1359
1360 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1361 {
1362         return (op_encode_hdr_size + op_encode_change_info_maxsz
1363                 + op_encode_change_info_maxsz) * sizeof(__be32);
1364 }
1365
1366 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1367 {
1368         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1369 }
1370
1371 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1372 {
1373         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1374 }
1375
1376 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1377 {
1378         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1379 }
1380
1381 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1382 {
1383         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1384                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1385                 2 + /*eir_server_owner.so_minor_id */\
1386                 /* eir_server_owner.so_major_id<> */\
1387                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1388                 /* eir_server_scope<> */\
1389                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1390                 1 + /* eir_server_impl_id array length */\
1391                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1392 }
1393
1394 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1395 {
1396         return (op_encode_hdr_size + \
1397                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1398                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1399 }
1400
1401 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1402 {
1403         return (op_encode_hdr_size + \
1404                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1405                 2 + /* csr_sequence, csr_flags */\
1406                 op_encode_channel_attrs_maxsz + \
1407                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1408 }
1409
1410 static struct nfsd4_operation nfsd4_ops[] = {
1411         [OP_ACCESS] = {
1412                 .op_func = (nfsd4op_func)nfsd4_access,
1413                 .op_name = "OP_ACCESS",
1414         },
1415         [OP_CLOSE] = {
1416                 .op_func = (nfsd4op_func)nfsd4_close,
1417                 .op_flags = OP_MODIFIES_SOMETHING,
1418                 .op_name = "OP_CLOSE",
1419                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1420         },
1421         [OP_COMMIT] = {
1422                 .op_func = (nfsd4op_func)nfsd4_commit,
1423                 .op_flags = OP_MODIFIES_SOMETHING,
1424                 .op_name = "OP_COMMIT",
1425                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1426         },
1427         [OP_CREATE] = {
1428                 .op_func = (nfsd4op_func)nfsd4_create,
1429                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1430                 .op_name = "OP_CREATE",
1431                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1432         },
1433         [OP_DELEGRETURN] = {
1434                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1435                 .op_flags = OP_MODIFIES_SOMETHING,
1436                 .op_name = "OP_DELEGRETURN",
1437                 .op_rsize_bop = nfsd4_only_status_rsize,
1438         },
1439         [OP_GETATTR] = {
1440                 .op_func = (nfsd4op_func)nfsd4_getattr,
1441                 .op_flags = ALLOWED_ON_ABSENT_FS,
1442                 .op_name = "OP_GETATTR",
1443         },
1444         [OP_GETFH] = {
1445                 .op_func = (nfsd4op_func)nfsd4_getfh,
1446                 .op_name = "OP_GETFH",
1447         },
1448         [OP_LINK] = {
1449                 .op_func = (nfsd4op_func)nfsd4_link,
1450                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1451                                 | OP_CACHEME,
1452                 .op_name = "OP_LINK",
1453                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1454         },
1455         [OP_LOCK] = {
1456                 .op_func = (nfsd4op_func)nfsd4_lock,
1457                 .op_flags = OP_MODIFIES_SOMETHING,
1458                 .op_name = "OP_LOCK",
1459                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1460         },
1461         [OP_LOCKT] = {
1462                 .op_func = (nfsd4op_func)nfsd4_lockt,
1463                 .op_name = "OP_LOCKT",
1464         },
1465         [OP_LOCKU] = {
1466                 .op_func = (nfsd4op_func)nfsd4_locku,
1467                 .op_flags = OP_MODIFIES_SOMETHING,
1468                 .op_name = "OP_LOCKU",
1469                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1470         },
1471         [OP_LOOKUP] = {
1472                 .op_func = (nfsd4op_func)nfsd4_lookup,
1473                 .op_flags = OP_HANDLES_WRONGSEC,
1474                 .op_name = "OP_LOOKUP",
1475         },
1476         [OP_LOOKUPP] = {
1477                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1478                 .op_flags = OP_HANDLES_WRONGSEC,
1479                 .op_name = "OP_LOOKUPP",
1480         },
1481         [OP_NVERIFY] = {
1482                 .op_func = (nfsd4op_func)nfsd4_nverify,
1483                 .op_name = "OP_NVERIFY",
1484         },
1485         [OP_OPEN] = {
1486                 .op_func = (nfsd4op_func)nfsd4_open,
1487                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1488                 .op_name = "OP_OPEN",
1489                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1490         },
1491         [OP_OPEN_CONFIRM] = {
1492                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1493                 .op_flags = OP_MODIFIES_SOMETHING,
1494                 .op_name = "OP_OPEN_CONFIRM",
1495                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1496         },
1497         [OP_OPEN_DOWNGRADE] = {
1498                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1499                 .op_flags = OP_MODIFIES_SOMETHING,
1500                 .op_name = "OP_OPEN_DOWNGRADE",
1501                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1502         },
1503         [OP_PUTFH] = {
1504                 .op_func = (nfsd4op_func)nfsd4_putfh,
1505                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1506                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1507                 .op_name = "OP_PUTFH",
1508                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1509         },
1510         [OP_PUTPUBFH] = {
1511                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1512                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1513                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1514                 .op_name = "OP_PUTPUBFH",
1515                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1516         },
1517         [OP_PUTROOTFH] = {
1518                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1519                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1520                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1521                 .op_name = "OP_PUTROOTFH",
1522                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1523         },
1524         [OP_READ] = {
1525                 .op_func = (nfsd4op_func)nfsd4_read,
1526                 .op_flags = OP_MODIFIES_SOMETHING,
1527                 .op_name = "OP_READ",
1528                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1529         },
1530         [OP_READDIR] = {
1531                 .op_func = (nfsd4op_func)nfsd4_readdir,
1532                 .op_flags = OP_MODIFIES_SOMETHING,
1533                 .op_name = "OP_READDIR",
1534                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1535         },
1536         [OP_READLINK] = {
1537                 .op_func = (nfsd4op_func)nfsd4_readlink,
1538                 .op_name = "OP_READLINK",
1539         },
1540         [OP_REMOVE] = {
1541                 .op_func = (nfsd4op_func)nfsd4_remove,
1542                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1543                 .op_name = "OP_REMOVE",
1544                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1545         },
1546         [OP_RENAME] = {
1547                 .op_func = (nfsd4op_func)nfsd4_rename,
1548                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1549                 .op_name = "OP_RENAME",
1550                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1551         },
1552         [OP_RENEW] = {
1553                 .op_func = (nfsd4op_func)nfsd4_renew,
1554                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1555                                 | OP_MODIFIES_SOMETHING,
1556                 .op_name = "OP_RENEW",
1557                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1558
1559         },
1560         [OP_RESTOREFH] = {
1561                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1562                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1563                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1564                 .op_name = "OP_RESTOREFH",
1565                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1566         },
1567         [OP_SAVEFH] = {
1568                 .op_func = (nfsd4op_func)nfsd4_savefh,
1569                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1570                 .op_name = "OP_SAVEFH",
1571                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1572         },
1573         [OP_SECINFO] = {
1574                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1575                 .op_flags = OP_HANDLES_WRONGSEC,
1576                 .op_name = "OP_SECINFO",
1577         },
1578         [OP_SETATTR] = {
1579                 .op_func = (nfsd4op_func)nfsd4_setattr,
1580                 .op_name = "OP_SETATTR",
1581                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1582                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1583         },
1584         [OP_SETCLIENTID] = {
1585                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1586                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1587                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1588                 .op_name = "OP_SETCLIENTID",
1589                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1590         },
1591         [OP_SETCLIENTID_CONFIRM] = {
1592                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1593                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1594                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1595                 .op_name = "OP_SETCLIENTID_CONFIRM",
1596                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1597         },
1598         [OP_VERIFY] = {
1599                 .op_func = (nfsd4op_func)nfsd4_verify,
1600                 .op_name = "OP_VERIFY",
1601         },
1602         [OP_WRITE] = {
1603                 .op_func = (nfsd4op_func)nfsd4_write,
1604                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1605                 .op_name = "OP_WRITE",
1606                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1607         },
1608         [OP_RELEASE_LOCKOWNER] = {
1609                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1610                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1611                                 | OP_MODIFIES_SOMETHING,
1612                 .op_name = "OP_RELEASE_LOCKOWNER",
1613                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1614         },
1615
1616         /* NFSv4.1 operations */
1617         [OP_EXCHANGE_ID] = {
1618                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1619                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1620                                 | OP_MODIFIES_SOMETHING,
1621                 .op_name = "OP_EXCHANGE_ID",
1622                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1623         },
1624         [OP_BIND_CONN_TO_SESSION] = {
1625                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1626                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1627                                 | OP_MODIFIES_SOMETHING,
1628                 .op_name = "OP_BIND_CONN_TO_SESSION",
1629                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1630         },
1631         [OP_CREATE_SESSION] = {
1632                 .op_func = (nfsd4op_func)nfsd4_create_session,
1633                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1634                                 | OP_MODIFIES_SOMETHING,
1635                 .op_name = "OP_CREATE_SESSION",
1636                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1637         },
1638         [OP_DESTROY_SESSION] = {
1639                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1640                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1641                                 | OP_MODIFIES_SOMETHING,
1642                 .op_name = "OP_DESTROY_SESSION",
1643                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1644         },
1645         [OP_SEQUENCE] = {
1646                 .op_func = (nfsd4op_func)nfsd4_sequence,
1647                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1648                 .op_name = "OP_SEQUENCE",
1649         },
1650         [OP_DESTROY_CLIENTID] = {
1651                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1652                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1653                                 | OP_MODIFIES_SOMETHING,
1654                 .op_name = "OP_DESTROY_CLIENTID",
1655                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1656         },
1657         [OP_RECLAIM_COMPLETE] = {
1658                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1659                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1660                 .op_name = "OP_RECLAIM_COMPLETE",
1661                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1662         },
1663         [OP_SECINFO_NO_NAME] = {
1664                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1665                 .op_flags = OP_HANDLES_WRONGSEC,
1666                 .op_name = "OP_SECINFO_NO_NAME",
1667         },
1668         [OP_TEST_STATEID] = {
1669                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1670                 .op_flags = ALLOWED_WITHOUT_FH,
1671                 .op_name = "OP_TEST_STATEID",
1672         },
1673         [OP_FREE_STATEID] = {
1674                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1675                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1676                 .op_name = "OP_FREE_STATEID",
1677                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1678         },
1679 };
1680
1681 static const char *nfsd4_op_name(unsigned opnum)
1682 {
1683         if (opnum < ARRAY_SIZE(nfsd4_ops))
1684                 return nfsd4_ops[opnum].op_name;
1685         return "unknown_operation";
1686 }
1687
1688 #define nfsd4_voidres                   nfsd4_voidargs
1689 struct nfsd4_voidargs { int dummy; };
1690
1691 static struct svc_procedure             nfsd_procedures4[2] = {
1692         [NFSPROC4_NULL] = {
1693                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1694                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1695                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1696                 .pc_ressize = sizeof(struct nfsd4_voidres),
1697                 .pc_cachetype = RC_NOCACHE,
1698                 .pc_xdrressize = 1,
1699         },
1700         [NFSPROC4_COMPOUND] = {
1701                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1702                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1703                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1704                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1705                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1706                 .pc_release = nfsd4_release_compoundargs,
1707                 .pc_cachetype = RC_NOCACHE,
1708                 .pc_xdrressize = NFSD_BUFSIZE/4,
1709         },
1710 };
1711
1712 struct svc_version      nfsd_version4 = {
1713                 .vs_vers        = 4,
1714                 .vs_nproc       = 2,
1715                 .vs_proc        = nfsd_procedures4,
1716                 .vs_dispatch    = nfsd_dispatch,
1717                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1718 };
1719
1720 /*
1721  * Local variables:
1722  *  c-basic-offset: 8
1723  * End:
1724  */