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 #include "current_stateid.h"
  43
  44 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  45
  46 static u32 nfsd_attrmask[] = {
  47         NFSD_WRITEABLE_ATTRS_WORD0,
  48         NFSD_WRITEABLE_ATTRS_WORD1,
  49         NFSD_WRITEABLE_ATTRS_WORD2
  50 };
  51
  52 static u32 nfsd41_ex_attrmask[] = {
  53         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  54         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  55         NFSD_SUPPATTR_EXCLCREAT_WORD2
  56 };
  57
  58 static __be32
  59 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  60                    u32 *bmval, u32 *writable)
  61 {
  62         struct dentry *dentry = cstate->current_fh.fh_dentry;
  63
  64         /*
  65          * Check about attributes are supported by the NFSv4 server or not.
  66          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  67          */
  68         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  69             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  70             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  71                 return nfserr_attrnotsupp;
  72
  73         /*
  74          * Check FATTR4_WORD0_ACL can be supported
  75          * in current environment or not.
  76          */
  77         if (bmval[0] & FATTR4_WORD0_ACL) {
  78                 if (!IS_POSIXACL(dentry->d_inode))
  79                         return nfserr_attrnotsupp;
  80         }
  81
  82         /*
  83          * According to spec, read-only attributes return ERR_INVAL.
  84          */
  85         if (writable) {
  86                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  87                     (bmval[2] & ~writable[2]))
  88                         return nfserr_inval;
  89         }
  90
  91         return nfs_ok;
  92 }
  93
  94 static __be32
  95 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  96         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  97 {
  98         __be32 status = nfs_ok;
  99
 100         if (open->op_create == NFS4_OPEN_CREATE) {
 101                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 102                     || open->op_createmode == NFS4_CREATE_GUARDED)
 103                         status = check_attr_support(rqstp, cstate,
 104                                         open->op_bmval, nfsd_attrmask);
 105                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 106                         status = check_attr_support(rqstp, cstate,
 107                                         open->op_bmval, nfsd41_ex_attrmask);
 108         }
 109
 110         return status;
 111 }
 112
 113 static int
 114 is_create_with_attrs(struct nfsd4_open *open)
 115 {
 116         return open->op_create == NFS4_OPEN_CREATE
 117                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 118                     || open->op_createmode == NFS4_CREATE_GUARDED
 119                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 120 }
 121
 122 /*
 123  * if error occurs when setting the acl, just clear the acl bit
 124  * in the returned attr bitmap.
 125  */
 126 static void
 127 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 128                 struct nfs4_acl *acl, u32 *bmval)
 129 {
 130         __be32 status;
 131
 132         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 133         if (status)
 134                 /*
 135                  * We should probably fail the whole open at this point,
 136                  * but we've already created the file, so it's too late;
 137                  * So this seems the least of evils:
 138                  */
 139                 bmval[0] &= ~FATTR4_WORD0_ACL;
 140 }
 141
 142 static inline void
 143 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 144 {
 145         fh_put(dst);
 146         dget(src->fh_dentry);
 147         if (src->fh_export)
 148                 cache_get(&src->fh_export->h);
 149         *dst = *src;
 150 }
 151
 152 static __be32
 153 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 154 {
 155         __be32 status;
 156
 157         if (open->op_truncate &&
 158                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 159                 return nfserr_inval;
 160
 161         accmode |= NFSD_MAY_READ_IF_EXEC;
 162
 163         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 164                 accmode |= NFSD_MAY_READ;
 165         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 166                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 167         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 168                 accmode |= NFSD_MAY_WRITE;
 169
 170         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 171
 172         return status;
 173 }
 174
 175 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 176 {
 177         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 178
 179         if (S_ISREG(mode))
 180                 return nfs_ok;
 181         if (S_ISDIR(mode))
 182                 return nfserr_isdir;
 183         /*
 184          * Using err_symlink as our catch-all case may look odd; but
 185          * there's no other obvious error for this case in 4.0, and we
 186          * happen to know that it will cause the linux v4 client to do
 187          * the right thing on attempts to open something other than a
 188          * regular file.
 189          */
 190         return nfserr_symlink;
 191 }
 192
 193 static __be32
 194 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 195 {
 196         struct svc_fh resfh;
 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                 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 (!open->op_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         /* We don't know the target directory, and therefore can not
 271         * set the change info
 272         */
 273
 274         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 275
 276         /* set replay cache */
 277         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 278                         &current_fh->fh_handle);
 279
 280         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 281                 (open->op_iattr.ia_size == 0);
 282
 283         status = do_open_permission(rqstp, current_fh, open,
 284                                     NFSD_MAY_OWNER_OVERRIDE);
 285
 286         return status;
 287 }
 288
 289 static void
 290 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 291 {
 292         struct nfsd4_sessionid *sid =
 293                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 294
 295         clid->cl_boot = sid->clientid.cl_boot;
 296         clid->cl_id = sid->clientid.cl_id;
 297 }
 298
 299 static __be32
 300 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 301            struct nfsd4_open *open)
 302 {
 303         __be32 status;
 304         struct nfsd4_compoundres *resp;
 305
 306         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 307                 (int)open->op_fname.len, open->op_fname.data,
 308                 open->op_openowner);
 309
 310         /* This check required by spec. */
 311         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 312                 return nfserr_inval;
 313
 314         /* We don't yet support WANT bits: */
 315         open->op_share_access &= NFS4_SHARE_ACCESS_MASK;
 316
 317         open->op_created = 0;
 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                         status = do_open_lookup(rqstp, &cstate->current_fh,
 367                                                 open);
 368                         if (status)
 369                                 goto out;
 370                         break;
 371                 case NFS4_OPEN_CLAIM_PREVIOUS:
 372                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 373                         status = nfs4_check_open_reclaim(&open->op_clientid);
 374                         if (status)
 375                                 goto out;
 376                 case NFS4_OPEN_CLAIM_FH:
 377                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 378                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 379                                                  open);
 380                         if (status)
 381                                 goto out;
 382                         break;
 383                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 384                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 385                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 386                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 387                                 open->op_claim_type);
 388                         status = nfserr_notsupp;
 389                         goto out;
 390                 default:
 391                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 392                                 open->op_claim_type);
 393                         status = nfserr_inval;
 394                         goto out;
 395         }
 396         /*
 397          * nfsd4_process_open2() does the actual opening of the file.  If
 398          * successful, it (1) truncates the file if open->op_truncate was
 399          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 400          */
 401         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 402         WARN_ON(status && open->op_created);
 403 out:
 404         nfsd4_cleanup_open_state(open, status);
 405         if (open->op_openowner)
 406                 cstate->replay_owner = &open->op_openowner->oo_owner;
 407         else
 408                 nfs4_unlock_state();
 409         return status;
 410 }
 411
 412 /*
 413  * filehandle-manipulating ops.
 414  */
 415 static __be32
 416 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 417             struct svc_fh **getfh)
 418 {
 419         if (!cstate->current_fh.fh_dentry)
 420                 return nfserr_nofilehandle;
 421
 422         *getfh = &cstate->current_fh;
 423         return nfs_ok;
 424 }
 425
 426 static __be32
 427 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 428             struct nfsd4_putfh *putfh)
 429 {
 430         fh_put(&cstate->current_fh);
 431         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 432         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 433                putfh->pf_fhlen);
 434         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 435 }
 436
 437 static __be32
 438 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 439                 void *arg)
 440 {
 441         __be32 status;
 442
 443         fh_put(&cstate->current_fh);
 444         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 445         return status;
 446 }
 447
 448 static __be32
 449 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 450                 void *arg)
 451 {
 452         if (!cstate->save_fh.fh_dentry)
 453                 return nfserr_restorefh;
 454
 455         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 456         cstate->current_stateid = cstate->save_stateid;
 457         return nfs_ok;
 458 }
 459
 460 static __be32
 461 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 462              void *arg)
 463 {
 464         if (!cstate->current_fh.fh_dentry)
 465                 return nfserr_nofilehandle;
 466
 467         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 468         cstate->save_stateid = cstate->current_stateid;
 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
 833         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 834                 nfs4_lock_state();
 835                 status = nfs4_preprocess_stateid_op(cstate,
 836                         &setattr->sa_stateid, WR_STATE, NULL);
 837                 nfs4_unlock_state();
 838                 if (status) {
 839                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 840                         return status;
 841                 }
 842         }
 843         status = fh_want_write(&cstate->current_fh);
 844         if (status)
 845                 return status;
 846         status = nfs_ok;
 847
 848         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 849                                     nfsd_attrmask);
 850         if (status)
 851                 goto out;
 852
 853         if (setattr->sa_acl != NULL)
 854                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 855                                             setattr->sa_acl);
 856         if (status)
 857                 goto out;
 858         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 859                                 0, (time_t)0);
 860 out:
 861         fh_drop_write(&cstate->current_fh);
 862         return status;
 863 }
 864
 865 static __be32
 866 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 867             struct nfsd4_write *write)
 868 {
 869         stateid_t *stateid = &write->wr_stateid;
 870         struct file *filp = NULL;
 871         u32 *p;
 872         __be32 status = nfs_ok;
 873         unsigned long cnt;
 874
 875         /* no need to check permission - this will be done in nfsd_write() */
 876
 877         if (write->wr_offset >= OFFSET_MAX)
 878                 return nfserr_inval;
 879
 880         nfs4_lock_state();
 881         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 882         if (filp)
 883                 get_file(filp);
 884         nfs4_unlock_state();
 885
 886         if (status) {
 887                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 888                 return status;
 889         }
 890
 891         cnt = write->wr_buflen;
 892         write->wr_how_written = write->wr_stable_how;
 893         p = (u32 *)write->wr_verifier.data;
 894         *p++ = nfssvc_boot.tv_sec;
 895         *p++ = nfssvc_boot.tv_usec;
 896
 897         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 898                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 899                              &cnt, &write->wr_how_written);
 900         if (filp)
 901                 fput(filp);
 902
 903         write->wr_bytes_written = cnt;
 904
 905         return status;
 906 }
 907
 908 /* This routine never returns NFS_OK!  If there are no other errors, it
 909  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 910  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 911  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 912  */
 913 static __be32
 914 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 915              struct nfsd4_verify *verify)
 916 {
 917         __be32 *buf, *p;
 918         int count;
 919         __be32 status;
 920
 921         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 922         if (status)
 923                 return status;
 924
 925         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 926         if (status)
 927                 return status;
 928
 929         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 930             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 931                 return nfserr_inval;
 932         if (verify->ve_attrlen & 3)
 933                 return nfserr_inval;
 934
 935         /* count in words:
 936          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 937          */
 938         count = 4 + (verify->ve_attrlen >> 2);
 939         buf = kmalloc(count << 2, GFP_KERNEL);
 940         if (!buf)
 941                 return nfserr_jukebox;
 942
 943         status = nfsd4_encode_fattr(&cstate->current_fh,
 944                                     cstate->current_fh.fh_export,
 945                                     cstate->current_fh.fh_dentry, buf,
 946                                     &count, verify->ve_bmval,
 947                                     rqstp, 0);
 948
 949         /* this means that nfsd4_encode_fattr() ran out of space */
 950         if (status == nfserr_resource && count == 0)
 951                 status = nfserr_not_same;
 952         if (status)
 953                 goto out_kfree;
 954
 955         /* skip bitmap */
 956         p = buf + 1 + ntohl(buf[0]);
 957         status = nfserr_not_same;
 958         if (ntohl(*p++) != verify->ve_attrlen)
 959                 goto out_kfree;
 960         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 961                 status = nfserr_same;
 962
 963 out_kfree:
 964         kfree(buf);
 965         return status;
 966 }
 967
 968 static __be32
 969 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 970               struct nfsd4_verify *verify)
 971 {
 972         __be32 status;
 973
 974         status = _nfsd4_verify(rqstp, cstate, verify);
 975         return status == nfserr_not_same ? nfs_ok : status;
 976 }
 977
 978 static __be32
 979 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 980              struct nfsd4_verify *verify)
 981 {
 982         __be32 status;
 983
 984         status = _nfsd4_verify(rqstp, cstate, verify);
 985         return status == nfserr_same ? nfs_ok : status;
 986 }
 987
 988 /*
 989  * NULL call.
 990  */
 991 static __be32
 992 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 993 {
 994         return nfs_ok;
 995 }
 996
 997 static inline void nfsd4_increment_op_stats(u32 opnum)
 998 {
 999         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1000                 nfsdstats.nfs4_opcount[opnum]++;
1001 }
1002
1003 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1004                               void *);
1005 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1006 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1007 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
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          * These are ops which clear current state id.
1035          */
1036         OP_CLEAR_STATEID = 1 << 7,
1037 };
1038
1039 struct nfsd4_operation {
1040         nfsd4op_func op_func;
1041         u32 op_flags;
1042         char *op_name;
1043         /* Try to get response size before operation */
1044         nfsd4op_rsize op_rsize_bop;
1045         stateid_setter op_get_currentstateid;
1046         stateid_getter op_set_currentstateid;
1047 };
1048
1049 static struct nfsd4_operation nfsd4_ops[];
1050
1051 static const char *nfsd4_op_name(unsigned opnum);
1052
1053 /*
1054  * Enforce NFSv4.1 COMPOUND ordering rules:
1055  *
1056  * Also note, enforced elsewhere:
1057  *      - SEQUENCE other than as first op results in
1058  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1059  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1060  *        (Enforced in nfsd4_bind_conn_to_session().)
1061  *      - DESTROY_SESSION must be the final operation in a compound, if
1062  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1063  *        (Enforced in nfsd4_destroy_session().)
1064  */
1065 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1066 {
1067         struct nfsd4_op *op = &args->ops[0];
1068
1069         /* These ordering requirements don't apply to NFSv4.0: */
1070         if (args->minorversion == 0)
1071                 return nfs_ok;
1072         /* This is weird, but OK, not our problem: */
1073         if (args->opcnt == 0)
1074                 return nfs_ok;
1075         if (op->status == nfserr_op_illegal)
1076                 return nfs_ok;
1077         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1078                 return nfserr_op_not_in_session;
1079         if (op->opnum == OP_SEQUENCE)
1080                 return nfs_ok;
1081         if (args->opcnt != 1)
1082                 return nfserr_not_only_op;
1083         return nfs_ok;
1084 }
1085
1086 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1087 {
1088         return &nfsd4_ops[op->opnum];
1089 }
1090
1091 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1092 {
1093         return OPDESC(op)->op_flags & OP_CACHEME;
1094 }
1095
1096 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1097 {
1098         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1099         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1100         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1101         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1102         struct nfsd4_operation *thisd;
1103         struct nfsd4_operation *nextd;
1104
1105         thisd = OPDESC(this);
1106         /*
1107          * Most ops check wronsec on our own; only the putfh-like ops
1108          * have special rules.
1109          */
1110         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1111                 return false;
1112         /*
1113          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1114          * put-filehandle operation if we're not going to use the
1115          * result:
1116          */
1117         if (argp->opcnt == resp->opcnt)
1118                 return false;
1119
1120         nextd = OPDESC(next);
1121         /*
1122          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1123          * errors themselves as necessary; others should check for them
1124          * now:
1125          */
1126         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1127 }
1128
1129 /*
1130  * COMPOUND call.
1131  */
1132 static __be32
1133 nfsd4_proc_compound(struct svc_rqst *rqstp,
1134                     struct nfsd4_compoundargs *args,
1135                     struct nfsd4_compoundres *resp)
1136 {
1137         struct nfsd4_op *op;
1138         struct nfsd4_operation *opdesc;
1139         struct nfsd4_compound_state *cstate = &resp->cstate;
1140         int             slack_bytes;
1141         u32             plen = 0;
1142         __be32          status;
1143
1144         resp->xbuf = &rqstp->rq_res;
1145         resp->p = rqstp->rq_res.head[0].iov_base +
1146                                                 rqstp->rq_res.head[0].iov_len;
1147         resp->tagp = resp->p;
1148         /* reserve space for: taglen, tag, and opcnt */
1149         resp->p += 2 + XDR_QUADLEN(args->taglen);
1150         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1151         resp->taglen = args->taglen;
1152         resp->tag = args->tag;
1153         resp->opcnt = 0;
1154         resp->rqstp = rqstp;
1155         resp->cstate.minorversion = args->minorversion;
1156         resp->cstate.replay_owner = NULL;
1157         resp->cstate.session = NULL;
1158         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1159         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1160         /*
1161          * Don't use the deferral mechanism for NFSv4; compounds make it
1162          * too hard to avoid non-idempotency problems.
1163          */
1164         rqstp->rq_usedeferral = 0;
1165
1166         /*
1167          * According to RFC3010, this takes precedence over all other errors.
1168          */
1169         status = nfserr_minor_vers_mismatch;
1170         if (args->minorversion > nfsd_supported_minorversion)
1171                 goto out;
1172
1173         status = nfs41_check_op_ordering(args);
1174         if (status) {
1175                 op = &args->ops[0];
1176                 op->status = status;
1177                 goto encode_op;
1178         }
1179
1180         while (!status && resp->opcnt < args->opcnt) {
1181                 op = &args->ops[resp->opcnt++];
1182
1183                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1184                         resp->opcnt, args->opcnt, op->opnum,
1185                         nfsd4_op_name(op->opnum));
1186                 /*
1187                  * The XDR decode routines may have pre-set op->status;
1188                  * for example, if there is a miscellaneous XDR error
1189                  * it will be set to nfserr_bad_xdr.
1190                  */
1191                 if (op->status)
1192                         goto encode_op;
1193
1194                 /* We must be able to encode a successful response to
1195                  * this operation, with enough room left over to encode a
1196                  * failed response to the next operation.  If we don't
1197                  * have enough room, fail with ERR_RESOURCE.
1198                  */
1199                 slack_bytes = (char *)resp->end - (char *)resp->p;
1200                 if (slack_bytes < COMPOUND_SLACK_SPACE
1201                                 + COMPOUND_ERR_SLACK_SPACE) {
1202                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1203                         op->status = nfserr_resource;
1204                         goto encode_op;
1205                 }
1206
1207                 opdesc = OPDESC(op);
1208
1209                 if (!cstate->current_fh.fh_dentry) {
1210                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1211                                 op->status = nfserr_nofilehandle;
1212                                 goto encode_op;
1213                         }
1214                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1215                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1216                         op->status = nfserr_moved;
1217                         goto encode_op;
1218                 }
1219
1220                 /* If op is non-idempotent */
1221                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1222                         plen = opdesc->op_rsize_bop(rqstp, op);
1223                         op->status = nfsd4_check_resp_size(resp, plen);
1224                 }
1225
1226                 if (op->status)
1227                         goto encode_op;
1228
1229                 if (opdesc->op_func) {
1230                         if (opdesc->op_get_currentstateid)
1231                                 opdesc->op_get_currentstateid(cstate, &op->u);
1232                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1233                 } else
1234                         BUG_ON(op->status == nfs_ok);
1235
1236                 if (!op->status) {
1237                         if (opdesc->op_set_currentstateid)
1238                                 opdesc->op_set_currentstateid(cstate, &op->u);
1239
1240                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1241                                 cstate->current_stateid = NULL;
1242
1243                         if (need_wrongsec_check(rqstp))
1244                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1245                 }
1246
1247 encode_op:
1248                 /* Only from SEQUENCE */
1249                 if (resp->cstate.status == nfserr_replay_cache) {
1250                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1251                         status = op->status;
1252                         goto out;
1253                 }
1254                 if (op->status == nfserr_replay_me) {
1255                         op->replay = &cstate->replay_owner->so_replay;
1256                         nfsd4_encode_replay(resp, op);
1257                         status = op->status = op->replay->rp_status;
1258                 } else {
1259                         nfsd4_encode_operation(resp, op);
1260                         status = op->status;
1261                 }
1262
1263                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1264                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1265                         be32_to_cpu(status));
1266
1267                 if (cstate->replay_owner) {
1268                         nfs4_unlock_state();
1269                         cstate->replay_owner = NULL;
1270                 }
1271                 /* XXX Ugh, we need to get rid of this kind of special case: */
1272                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1273                         fput(op->u.read.rd_filp);
1274
1275                 nfsd4_increment_op_stats(op->opnum);
1276         }
1277
1278         resp->cstate.status = status;
1279         fh_put(&resp->cstate.current_fh);
1280         fh_put(&resp->cstate.save_fh);
1281         BUG_ON(resp->cstate.replay_owner);
1282 out:
1283         /* Reset deferral mechanism for RPC deferrals */
1284         rqstp->rq_usedeferral = 1;
1285         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1286         return status;
1287 }
1288
1289 #define op_encode_hdr_size              (2)
1290 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1291 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1292 #define op_encode_change_info_maxsz     (5)
1293 #define nfs4_fattr_bitmap_maxsz         (4)
1294
1295 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1296 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1297
1298 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1299
1300 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1301 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1302                                          op_encode_ace_maxsz)
1303
1304 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1305
1306 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1307 {
1308         return (op_encode_hdr_size) * sizeof(__be32);
1309 }
1310
1311 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1312 {
1313         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1314 }
1315
1316 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1317 {
1318         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1319 }
1320
1321 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1322 {
1323         return (op_encode_hdr_size + op_encode_change_info_maxsz
1324                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1325 }
1326
1327 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1328 {
1329         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1330                 * sizeof(__be32);
1331 }
1332
1333 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1334 {
1335         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1336                 * sizeof(__be32);
1337 }
1338
1339 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1340 {
1341         return (op_encode_hdr_size + op_encode_stateid_maxsz
1342                 + op_encode_change_info_maxsz + 1
1343                 + nfs4_fattr_bitmap_maxsz
1344                 + op_encode_delegation_maxsz) * sizeof(__be32);
1345 }
1346
1347 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1348 {
1349         u32 maxcount = 0, rlen = 0;
1350
1351         maxcount = svc_max_payload(rqstp);
1352         rlen = op->u.read.rd_length;
1353
1354         if (rlen > maxcount)
1355                 rlen = maxcount;
1356
1357         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1358 }
1359
1360 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1361 {
1362         u32 rlen = op->u.readdir.rd_maxcount;
1363
1364         if (rlen > PAGE_SIZE)
1365                 rlen = PAGE_SIZE;
1366
1367         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1368                  * sizeof(__be32) + rlen;
1369 }
1370
1371 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1372 {
1373         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1374                 * sizeof(__be32);
1375 }
1376
1377 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1378 {
1379         return (op_encode_hdr_size + op_encode_change_info_maxsz
1380                 + op_encode_change_info_maxsz) * sizeof(__be32);
1381 }
1382
1383 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1384 {
1385         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1386 }
1387
1388 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1389 {
1390         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1391 }
1392
1393 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1394 {
1395         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1396 }
1397
1398 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1399 {
1400         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1401                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1402                 2 + /*eir_server_owner.so_minor_id */\
1403                 /* eir_server_owner.so_major_id<> */\
1404                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1405                 /* eir_server_scope<> */\
1406                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1407                 1 + /* eir_server_impl_id array length */\
1408                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1409 }
1410
1411 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1412 {
1413         return (op_encode_hdr_size + \
1414                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1415                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1416 }
1417
1418 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1419 {
1420         return (op_encode_hdr_size + \
1421                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1422                 2 + /* csr_sequence, csr_flags */\
1423                 op_encode_channel_attrs_maxsz + \
1424                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1425 }
1426
1427 static struct nfsd4_operation nfsd4_ops[] = {
1428         [OP_ACCESS] = {
1429                 .op_func = (nfsd4op_func)nfsd4_access,
1430                 .op_name = "OP_ACCESS",
1431         },
1432         [OP_CLOSE] = {
1433                 .op_func = (nfsd4op_func)nfsd4_close,
1434                 .op_flags = OP_MODIFIES_SOMETHING,
1435                 .op_name = "OP_CLOSE",
1436                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1437                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1438                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1439         },
1440         [OP_COMMIT] = {
1441                 .op_func = (nfsd4op_func)nfsd4_commit,
1442                 .op_flags = OP_MODIFIES_SOMETHING,
1443                 .op_name = "OP_COMMIT",
1444                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1445         },
1446         [OP_CREATE] = {
1447                 .op_func = (nfsd4op_func)nfsd4_create,
1448                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1449                 .op_name = "OP_CREATE",
1450                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1451         },
1452         [OP_DELEGRETURN] = {
1453                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1454                 .op_flags = OP_MODIFIES_SOMETHING,
1455                 .op_name = "OP_DELEGRETURN",
1456                 .op_rsize_bop = nfsd4_only_status_rsize,
1457                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1458         },
1459         [OP_GETATTR] = {
1460                 .op_func = (nfsd4op_func)nfsd4_getattr,
1461                 .op_flags = ALLOWED_ON_ABSENT_FS,
1462                 .op_name = "OP_GETATTR",
1463         },
1464         [OP_GETFH] = {
1465                 .op_func = (nfsd4op_func)nfsd4_getfh,
1466                 .op_name = "OP_GETFH",
1467         },
1468         [OP_LINK] = {
1469                 .op_func = (nfsd4op_func)nfsd4_link,
1470                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1471                                 | OP_CACHEME,
1472                 .op_name = "OP_LINK",
1473                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1474         },
1475         [OP_LOCK] = {
1476                 .op_func = (nfsd4op_func)nfsd4_lock,
1477                 .op_flags = OP_MODIFIES_SOMETHING,
1478                 .op_name = "OP_LOCK",
1479                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1480                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1481         },
1482         [OP_LOCKT] = {
1483                 .op_func = (nfsd4op_func)nfsd4_lockt,
1484                 .op_name = "OP_LOCKT",
1485         },
1486         [OP_LOCKU] = {
1487                 .op_func = (nfsd4op_func)nfsd4_locku,
1488                 .op_flags = OP_MODIFIES_SOMETHING,
1489                 .op_name = "OP_LOCKU",
1490                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1491                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1492         },
1493         [OP_LOOKUP] = {
1494                 .op_func = (nfsd4op_func)nfsd4_lookup,
1495                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1496                 .op_name = "OP_LOOKUP",
1497         },
1498         [OP_LOOKUPP] = {
1499                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1500                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1501                 .op_name = "OP_LOOKUPP",
1502         },
1503         [OP_NVERIFY] = {
1504                 .op_func = (nfsd4op_func)nfsd4_nverify,
1505                 .op_name = "OP_NVERIFY",
1506         },
1507         [OP_OPEN] = {
1508                 .op_func = (nfsd4op_func)nfsd4_open,
1509                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1510                 .op_name = "OP_OPEN",
1511                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1512                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1513         },
1514         [OP_OPEN_CONFIRM] = {
1515                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1516                 .op_flags = OP_MODIFIES_SOMETHING,
1517                 .op_name = "OP_OPEN_CONFIRM",
1518                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1519         },
1520         [OP_OPEN_DOWNGRADE] = {
1521                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1522                 .op_flags = OP_MODIFIES_SOMETHING,
1523                 .op_name = "OP_OPEN_DOWNGRADE",
1524                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1525                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1526                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1527         },
1528         [OP_PUTFH] = {
1529                 .op_func = (nfsd4op_func)nfsd4_putfh,
1530                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1531                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1532                                 | OP_CLEAR_STATEID,
1533                 .op_name = "OP_PUTFH",
1534                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1535         },
1536         [OP_PUTPUBFH] = {
1537                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1538                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1539                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1540                                 | OP_CLEAR_STATEID,
1541                 .op_name = "OP_PUTPUBFH",
1542                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1543         },
1544         [OP_PUTROOTFH] = {
1545                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1546                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1547                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1548                                 | OP_CLEAR_STATEID,
1549                 .op_name = "OP_PUTROOTFH",
1550                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1551         },
1552         [OP_READ] = {
1553                 .op_func = (nfsd4op_func)nfsd4_read,
1554                 .op_flags = OP_MODIFIES_SOMETHING,
1555                 .op_name = "OP_READ",
1556                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1557                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1558         },
1559         [OP_READDIR] = {
1560                 .op_func = (nfsd4op_func)nfsd4_readdir,
1561                 .op_flags = OP_MODIFIES_SOMETHING,
1562                 .op_name = "OP_READDIR",
1563                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1564         },
1565         [OP_READLINK] = {
1566                 .op_func = (nfsd4op_func)nfsd4_readlink,
1567                 .op_name = "OP_READLINK",
1568         },
1569         [OP_REMOVE] = {
1570                 .op_func = (nfsd4op_func)nfsd4_remove,
1571                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1572                 .op_name = "OP_REMOVE",
1573                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1574         },
1575         [OP_RENAME] = {
1576                 .op_func = (nfsd4op_func)nfsd4_rename,
1577                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1578                 .op_name = "OP_RENAME",
1579                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1580         },
1581         [OP_RENEW] = {
1582                 .op_func = (nfsd4op_func)nfsd4_renew,
1583                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1584                                 | OP_MODIFIES_SOMETHING,
1585                 .op_name = "OP_RENEW",
1586                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1587
1588         },
1589         [OP_RESTOREFH] = {
1590                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1591                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1592                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1593                 .op_name = "OP_RESTOREFH",
1594                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1595         },
1596         [OP_SAVEFH] = {
1597                 .op_func = (nfsd4op_func)nfsd4_savefh,
1598                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1599                 .op_name = "OP_SAVEFH",
1600                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1601         },
1602         [OP_SECINFO] = {
1603                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1604                 .op_flags = OP_HANDLES_WRONGSEC,
1605                 .op_name = "OP_SECINFO",
1606         },
1607         [OP_SETATTR] = {
1608                 .op_func = (nfsd4op_func)nfsd4_setattr,
1609                 .op_name = "OP_SETATTR",
1610                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1611                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1612                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1613         },
1614         [OP_SETCLIENTID] = {
1615                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1616                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1617                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1618                 .op_name = "OP_SETCLIENTID",
1619                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1620         },
1621         [OP_SETCLIENTID_CONFIRM] = {
1622                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1623                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1624                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1625                 .op_name = "OP_SETCLIENTID_CONFIRM",
1626                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1627         },
1628         [OP_VERIFY] = {
1629                 .op_func = (nfsd4op_func)nfsd4_verify,
1630                 .op_name = "OP_VERIFY",
1631         },
1632         [OP_WRITE] = {
1633                 .op_func = (nfsd4op_func)nfsd4_write,
1634                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1635                 .op_name = "OP_WRITE",
1636                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1637                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1638         },
1639         [OP_RELEASE_LOCKOWNER] = {
1640                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1641                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1642                                 | OP_MODIFIES_SOMETHING,
1643                 .op_name = "OP_RELEASE_LOCKOWNER",
1644                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1645         },
1646
1647         /* NFSv4.1 operations */
1648         [OP_EXCHANGE_ID] = {
1649                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1650                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1651                                 | OP_MODIFIES_SOMETHING,
1652                 .op_name = "OP_EXCHANGE_ID",
1653                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1654         },
1655         [OP_BIND_CONN_TO_SESSION] = {
1656                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1657                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1658                                 | OP_MODIFIES_SOMETHING,
1659                 .op_name = "OP_BIND_CONN_TO_SESSION",
1660                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1661         },
1662         [OP_CREATE_SESSION] = {
1663                 .op_func = (nfsd4op_func)nfsd4_create_session,
1664                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1665                                 | OP_MODIFIES_SOMETHING,
1666                 .op_name = "OP_CREATE_SESSION",
1667                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1668         },
1669         [OP_DESTROY_SESSION] = {
1670                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1671                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1672                                 | OP_MODIFIES_SOMETHING,
1673                 .op_name = "OP_DESTROY_SESSION",
1674                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1675         },
1676         [OP_SEQUENCE] = {
1677                 .op_func = (nfsd4op_func)nfsd4_sequence,
1678                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1679                 .op_name = "OP_SEQUENCE",
1680         },
1681         [OP_DESTROY_CLIENTID] = {
1682                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1683                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1684                                 | OP_MODIFIES_SOMETHING,
1685                 .op_name = "OP_DESTROY_CLIENTID",
1686                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1687         },
1688         [OP_RECLAIM_COMPLETE] = {
1689                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1690                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1691                 .op_name = "OP_RECLAIM_COMPLETE",
1692                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1693         },
1694         [OP_SECINFO_NO_NAME] = {
1695                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1696                 .op_flags = OP_HANDLES_WRONGSEC,
1697                 .op_name = "OP_SECINFO_NO_NAME",
1698         },
1699         [OP_TEST_STATEID] = {
1700                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1701                 .op_flags = ALLOWED_WITHOUT_FH,
1702                 .op_name = "OP_TEST_STATEID",
1703         },
1704         [OP_FREE_STATEID] = {
1705                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1706                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1707                 .op_name = "OP_FREE_STATEID",
1708                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1709         },
1710 };
1711
1712 static const char *nfsd4_op_name(unsigned opnum)
1713 {
1714         if (opnum < ARRAY_SIZE(nfsd4_ops))
1715                 return nfsd4_ops[opnum].op_name;
1716         return "unknown_operation";
1717 }
1718
1719 #define nfsd4_voidres                   nfsd4_voidargs
1720 struct nfsd4_voidargs { int dummy; };
1721
1722 static struct svc_procedure             nfsd_procedures4[2] = {
1723         [NFSPROC4_NULL] = {
1724                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1725                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1726                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1727                 .pc_ressize = sizeof(struct nfsd4_voidres),
1728                 .pc_cachetype = RC_NOCACHE,
1729                 .pc_xdrressize = 1,
1730         },
1731         [NFSPROC4_COMPOUND] = {
1732                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1733                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1734                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1735                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1736                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1737                 .pc_release = nfsd4_release_compoundargs,
1738                 .pc_cachetype = RC_NOCACHE,
1739                 .pc_xdrressize = NFSD_BUFSIZE/4,
1740         },
1741 };
1742
1743 struct svc_version      nfsd_version4 = {
1744                 .vs_vers        = 4,
1745                 .vs_nproc       = 2,
1746                 .vs_proc        = nfsd_procedures4,
1747                 .vs_dispatch    = nfsd_dispatch,
1748                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1749 };
1750
1751 /*
1752  * Local variables:
1753  *  c-basic-offset: 8
1754  * End:
1755  */