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 #include "netns.h"
  44
  45 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  46
  47 static u32 nfsd_attrmask[] = {
  48         NFSD_WRITEABLE_ATTRS_WORD0,
  49         NFSD_WRITEABLE_ATTRS_WORD1,
  50         NFSD_WRITEABLE_ATTRS_WORD2
  51 };
  52
  53 static u32 nfsd41_ex_attrmask[] = {
  54         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  55         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  56         NFSD_SUPPATTR_EXCLCREAT_WORD2
  57 };
  58
  59 static __be32
  60 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  61                    u32 *bmval, u32 *writable)
  62 {
  63         struct dentry *dentry = cstate->current_fh.fh_dentry;
  64
  65         /*
  66          * Check about attributes are supported by the NFSv4 server or not.
  67          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  68          */
  69         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  70             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  71             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  72                 return nfserr_attrnotsupp;
  73
  74         /*
  75          * Check FATTR4_WORD0_ACL can be supported
  76          * in current environment or not.
  77          */
  78         if (bmval[0] & FATTR4_WORD0_ACL) {
  79                 if (!IS_POSIXACL(dentry->d_inode))
  80                         return nfserr_attrnotsupp;
  81         }
  82
  83         /*
  84          * According to spec, read-only attributes return ERR_INVAL.
  85          */
  86         if (writable) {
  87                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  88                     (bmval[2] & ~writable[2]))
  89                         return nfserr_inval;
  90         }
  91
  92         return nfs_ok;
  93 }
  94
  95 static __be32
  96 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  97         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  98 {
  99         __be32 status = nfs_ok;
 100
 101         if (open->op_create == NFS4_OPEN_CREATE) {
 102                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 103                     || open->op_createmode == NFS4_CREATE_GUARDED)
 104                         status = check_attr_support(rqstp, cstate,
 105                                         open->op_bmval, nfsd_attrmask);
 106                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 107                         status = check_attr_support(rqstp, cstate,
 108                                         open->op_bmval, nfsd41_ex_attrmask);
 109         }
 110
 111         return status;
 112 }
 113
 114 static int
 115 is_create_with_attrs(struct nfsd4_open *open)
 116 {
 117         return open->op_create == NFS4_OPEN_CREATE
 118                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 119                     || open->op_createmode == NFS4_CREATE_GUARDED
 120                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 121 }
 122
 123 /*
 124  * if error occurs when setting the acl, just clear the acl bit
 125  * in the returned attr bitmap.
 126  */
 127 static void
 128 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 129                 struct nfs4_acl *acl, u32 *bmval)
 130 {
 131         __be32 status;
 132
 133         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 134         if (status)
 135                 /*
 136                  * We should probably fail the whole open at this point,
 137                  * but we've already created the file, so it's too late;
 138                  * So this seems the least of evils:
 139                  */
 140                 bmval[0] &= ~FATTR4_WORD0_ACL;
 141 }
 142
 143 static inline void
 144 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 145 {
 146         fh_put(dst);
 147         dget(src->fh_dentry);
 148         if (src->fh_export)
 149                 cache_get(&src->fh_export->h);
 150         *dst = *src;
 151 }
 152
 153 static __be32
 154 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 155 {
 156         __be32 status;
 157
 158         if (open->op_truncate &&
 159                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 160                 return nfserr_inval;
 161
 162         accmode |= NFSD_MAY_READ_IF_EXEC;
 163
 164         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 165                 accmode |= NFSD_MAY_READ;
 166         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 167                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 168         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 169                 accmode |= NFSD_MAY_WRITE;
 170
 171         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 172
 173         return status;
 174 }
 175
 176 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 177 {
 178         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 179
 180         if (S_ISREG(mode))
 181                 return nfs_ok;
 182         if (S_ISDIR(mode))
 183                 return nfserr_isdir;
 184         /*
 185          * Using err_symlink as our catch-all case may look odd; but
 186          * there's no other obvious error for this case in 4.0, and we
 187          * happen to know that it will cause the linux v4 client to do
 188          * the right thing on attempts to open something other than a
 189          * regular file.
 190          */
 191         return nfserr_symlink;
 192 }
 193
 194 static __be32
 195 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 196 {
 197         struct svc_fh *resfh;
 198         int accmode;
 199         __be32 status;
 200
 201         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 202         if (!resfh)
 203                 return nfserr_jukebox;
 204         fh_init(resfh, NFS4_FHSIZE);
 205         open->op_truncate = 0;
 206
 207         if (open->op_create) {
 208                 /* FIXME: check session persistence and pnfs flags.
 209                  * The nfsv4.1 spec requires the following semantics:
 210                  *
 211                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 212                  * Reply Cache  | server |                 |
 213                  * -------------+--------+-----------------+--------------------
 214                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 215                  *              |        |                 | (SHOULD)
 216                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 217                  *              |        |                 | (SHOULD NOT)
 218                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 219                  * yes          | no     | GUARDED4        | GUARDED4
 220                  * yes          | yes    | GUARDED4        | GUARDED4
 221                  */
 222
 223                 /*
 224                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 225                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 226                  */
 227                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 228                                         open->op_fname.len, &open->op_iattr,
 229                                         resfh, open->op_createmode,
 230                                         (u32 *)open->op_verf.data,
 231                                         &open->op_truncate, &open->op_created);
 232
 233                 /*
 234                  * Following rfc 3530 14.2.16, use the returned bitmask
 235                  * to indicate which attributes we used to store the
 236                  * verifier:
 237                  */
 238                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 239                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 240                                                         FATTR4_WORD1_TIME_MODIFY);
 241         } else {
 242                 status = nfsd_lookup(rqstp, current_fh,
 243                                      open->op_fname.data, open->op_fname.len, resfh);
 244                 fh_unlock(current_fh);
 245         }
 246         if (status)
 247                 goto out;
 248         status = nfsd_check_obj_isreg(resfh);
 249         if (status)
 250                 goto out;
 251
 252         if (is_create_with_attrs(open) && open->op_acl != NULL)
 253                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 254
 255         /* set reply cache */
 256         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 257                         &resfh->fh_handle);
 258         accmode = NFSD_MAY_NOP;
 259         if (open->op_created)
 260                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 261         status = do_open_permission(rqstp, resfh, open, accmode);
 262         set_change_info(&open->op_cinfo, current_fh);
 263         fh_dup2(current_fh, resfh);
 264 out:
 265         fh_put(resfh);
 266         kfree(resfh);
 267         return status;
 268 }
 269
 270 static __be32
 271 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 272 {
 273         __be32 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         struct net *net = SVC_NET(rqstp);
 311         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 312
 313         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 314                 (int)open->op_fname.len, open->op_fname.data,
 315                 open->op_openowner);
 316
 317         /* This check required by spec. */
 318         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 319                 return nfserr_inval;
 320
 321         open->op_created = 0;
 322         /*
 323          * RFC5661 18.51.3
 324          * Before RECLAIM_COMPLETE done, server should deny new lock
 325          */
 326         if (nfsd4_has_session(cstate) &&
 327             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 328                       &cstate->session->se_client->cl_flags) &&
 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, nn);
 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(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 363                 goto out;
 364         status = nfserr_no_grace;
 365         if (!locks_in_grace(net) && 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                         status = nfs4_check_open_reclaim(&open->op_clientid,
 379                                                          cstate->minorversion,
 380                                                          nn);
 381                         if (status)
 382                                 goto out;
 383                 case NFS4_OPEN_CLAIM_FH:
 384                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 385                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 386                                                  open);
 387                         if (status)
 388                                 goto out;
 389                         break;
 390                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 391                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 392                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 393                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 394                                 open->op_claim_type);
 395                         status = nfserr_notsupp;
 396                         goto out;
 397                 default:
 398                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 399                                 open->op_claim_type);
 400                         status = nfserr_inval;
 401                         goto out;
 402         }
 403         /*
 404          * nfsd4_process_open2() does the actual opening of the file.  If
 405          * successful, it (1) truncates the file if open->op_truncate was
 406          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 407          */
 408         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 409         WARN_ON(status && open->op_created);
 410 out:
 411         nfsd4_cleanup_open_state(open, status);
 412         if (open->op_openowner)
 413                 cstate->replay_owner = &open->op_openowner->oo_owner;
 414         else
 415                 nfs4_unlock_state();
 416         return status;
 417 }
 418
 419 /*
 420  * filehandle-manipulating ops.
 421  */
 422 static __be32
 423 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 424             struct svc_fh **getfh)
 425 {
 426         if (!cstate->current_fh.fh_dentry)
 427                 return nfserr_nofilehandle;
 428
 429         *getfh = &cstate->current_fh;
 430         return nfs_ok;
 431 }
 432
 433 static __be32
 434 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 435             struct nfsd4_putfh *putfh)
 436 {
 437         fh_put(&cstate->current_fh);
 438         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 439         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 440                putfh->pf_fhlen);
 441         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 442 }
 443
 444 static __be32
 445 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 446                 void *arg)
 447 {
 448         __be32 status;
 449
 450         fh_put(&cstate->current_fh);
 451         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 452         return status;
 453 }
 454
 455 static __be32
 456 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 457                 void *arg)
 458 {
 459         if (!cstate->save_fh.fh_dentry)
 460                 return nfserr_restorefh;
 461
 462         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 463         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 464                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 465                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 466         }
 467         return nfs_ok;
 468 }
 469
 470 static __be32
 471 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 472              void *arg)
 473 {
 474         if (!cstate->current_fh.fh_dentry)
 475                 return nfserr_nofilehandle;
 476
 477         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 478         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 479                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 480                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 481         }
 482         return nfs_ok;
 483 }
 484
 485 /*
 486  * misc nfsv4 ops
 487  */
 488 static __be32
 489 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 490              struct nfsd4_access *access)
 491 {
 492         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 493                 return nfserr_inval;
 494
 495         access->ac_resp_access = access->ac_req_access;
 496         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 497                            &access->ac_supported);
 498 }
 499
 500 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 501 {
 502         __be32 verf[2];
 503         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 504
 505         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 506         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 507         memcpy(verifier->data, verf, sizeof(verifier->data));
 508 }
 509
 510 static __be32
 511 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 512              struct nfsd4_commit *commit)
 513 {
 514         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 515         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 516                              commit->co_count);
 517 }
 518
 519 static __be32
 520 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521              struct nfsd4_create *create)
 522 {
 523         struct svc_fh resfh;
 524         __be32 status;
 525         dev_t rdev;
 526
 527         fh_init(&resfh, NFS4_FHSIZE);
 528
 529         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 530                            NFSD_MAY_CREATE);
 531         if (status)
 532                 return status;
 533
 534         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 535                                     nfsd_attrmask);
 536         if (status)
 537                 return status;
 538
 539         switch (create->cr_type) {
 540         case NF4LNK:
 541                 /* ugh! we have to null-terminate the linktext, or
 542                  * vfs_symlink() will choke.  it is always safe to
 543                  * null-terminate by brute force, since at worst we
 544                  * will overwrite the first byte of the create namelen
 545                  * in the XDR buffer, which has already been extracted
 546                  * during XDR decode.
 547                  */
 548                 create->cr_linkname[create->cr_linklen] = 0;
 549
 550                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 551                                       create->cr_name, create->cr_namelen,
 552                                       create->cr_linkname, create->cr_linklen,
 553                                       &resfh, &create->cr_iattr);
 554                 break;
 555
 556         case NF4BLK:
 557                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 558                 if (MAJOR(rdev) != create->cr_specdata1 ||
 559                     MINOR(rdev) != create->cr_specdata2)
 560                         return nfserr_inval;
 561                 status = nfsd_create(rqstp, &cstate->current_fh,
 562                                      create->cr_name, create->cr_namelen,
 563                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 564                 break;
 565
 566         case NF4CHR:
 567                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 568                 if (MAJOR(rdev) != create->cr_specdata1 ||
 569                     MINOR(rdev) != create->cr_specdata2)
 570                         return nfserr_inval;
 571                 status = nfsd_create(rqstp, &cstate->current_fh,
 572                                      create->cr_name, create->cr_namelen,
 573                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 574                 break;
 575
 576         case NF4SOCK:
 577                 status = nfsd_create(rqstp, &cstate->current_fh,
 578                                      create->cr_name, create->cr_namelen,
 579                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 580                 break;
 581
 582         case NF4FIFO:
 583                 status = nfsd_create(rqstp, &cstate->current_fh,
 584                                      create->cr_name, create->cr_namelen,
 585                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 586                 break;
 587
 588         case NF4DIR:
 589                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 590                 status = nfsd_create(rqstp, &cstate->current_fh,
 591                                      create->cr_name, create->cr_namelen,
 592                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 593                 break;
 594
 595         default:
 596                 status = nfserr_badtype;
 597         }
 598
 599         if (status)
 600                 goto out;
 601
 602         if (create->cr_acl != NULL)
 603                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 604                                 create->cr_bmval);
 605
 606         fh_unlock(&cstate->current_fh);
 607         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 608         fh_dup2(&cstate->current_fh, &resfh);
 609 out:
 610         fh_put(&resfh);
 611         return status;
 612 }
 613
 614 static __be32
 615 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 616               struct nfsd4_getattr *getattr)
 617 {
 618         __be32 status;
 619
 620         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 621         if (status)
 622                 return status;
 623
 624         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 625                 return nfserr_inval;
 626
 627         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 628         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 629         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 630
 631         getattr->ga_fhp = &cstate->current_fh;
 632         return nfs_ok;
 633 }
 634
 635 static __be32
 636 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 637            struct nfsd4_link *link)
 638 {
 639         __be32 status = nfserr_nofilehandle;
 640
 641         if (!cstate->save_fh.fh_dentry)
 642                 return status;
 643         status = nfsd_link(rqstp, &cstate->current_fh,
 644                            link->li_name, link->li_namelen, &cstate->save_fh);
 645         if (!status)
 646                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 647         return status;
 648 }
 649
 650 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 651 {
 652         struct svc_fh tmp_fh;
 653         __be32 ret;
 654
 655         fh_init(&tmp_fh, NFS4_FHSIZE);
 656         ret = exp_pseudoroot(rqstp, &tmp_fh);
 657         if (ret)
 658                 return ret;
 659         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 660                 fh_put(&tmp_fh);
 661                 return nfserr_noent;
 662         }
 663         fh_put(&tmp_fh);
 664         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 665 }
 666
 667 static __be32
 668 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 669               void *arg)
 670 {
 671         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 672 }
 673
 674 static __be32
 675 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 676              struct nfsd4_lookup *lookup)
 677 {
 678         return nfsd_lookup(rqstp, &cstate->current_fh,
 679                            lookup->lo_name, lookup->lo_len,
 680                            &cstate->current_fh);
 681 }
 682
 683 static __be32
 684 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 685            struct nfsd4_read *read)
 686 {
 687         __be32 status;
 688
 689         /* no need to check permission - this will be done in nfsd_read() */
 690
 691         read->rd_filp = NULL;
 692         if (read->rd_offset >= OFFSET_MAX)
 693                 return nfserr_inval;
 694
 695         nfs4_lock_state();
 696         /* check stateid */
 697         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 698                                                  cstate, &read->rd_stateid,
 699                                                  RD_STATE, &read->rd_filp))) {
 700                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 701                 goto out;
 702         }
 703         if (read->rd_filp)
 704                 get_file(read->rd_filp);
 705         status = nfs_ok;
 706 out:
 707         nfs4_unlock_state();
 708         read->rd_rqstp = rqstp;
 709         read->rd_fhp = &cstate->current_fh;
 710         return status;
 711 }
 712
 713 static __be32
 714 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 715               struct nfsd4_readdir *readdir)
 716 {
 717         u64 cookie = readdir->rd_cookie;
 718         static const nfs4_verifier zeroverf;
 719
 720         /* no need to check permission - this will be done in nfsd_readdir() */
 721
 722         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 723                 return nfserr_inval;
 724
 725         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 726         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 727         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 728
 729         if ((cookie == 1) || (cookie == 2) ||
 730             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 731                 return nfserr_bad_cookie;
 732
 733         readdir->rd_rqstp = rqstp;
 734         readdir->rd_fhp = &cstate->current_fh;
 735         return nfs_ok;
 736 }
 737
 738 static __be32
 739 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 740                struct nfsd4_readlink *readlink)
 741 {
 742         readlink->rl_rqstp = rqstp;
 743         readlink->rl_fhp = &cstate->current_fh;
 744         return nfs_ok;
 745 }
 746
 747 static __be32
 748 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 749              struct nfsd4_remove *remove)
 750 {
 751         __be32 status;
 752
 753         if (locks_in_grace(SVC_NET(rqstp)))
 754                 return nfserr_grace;
 755         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 756                              remove->rm_name, remove->rm_namelen);
 757         if (!status) {
 758                 fh_unlock(&cstate->current_fh);
 759                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 760         }
 761         return status;
 762 }
 763
 764 static __be32
 765 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 766              struct nfsd4_rename *rename)
 767 {
 768         __be32 status = nfserr_nofilehandle;
 769
 770         if (!cstate->save_fh.fh_dentry)
 771                 return status;
 772         if (locks_in_grace(SVC_NET(rqstp)) &&
 773                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 774                 return nfserr_grace;
 775         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 776                              rename->rn_snamelen, &cstate->current_fh,
 777                              rename->rn_tname, rename->rn_tnamelen);
 778
 779         /* the underlying filesystem returns different error's than required
 780          * by NFSv4. both save_fh and current_fh have been verified.. */
 781         if (status == nfserr_isdir)
 782                 status = nfserr_exist;
 783         else if ((status == nfserr_notdir) &&
 784                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 785                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 786                 status = nfserr_exist;
 787
 788         if (!status) {
 789                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 790                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 791         }
 792         return status;
 793 }
 794
 795 static __be32
 796 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 797               struct nfsd4_secinfo *secinfo)
 798 {
 799         struct svc_fh resfh;
 800         struct svc_export *exp;
 801         struct dentry *dentry;
 802         __be32 err;
 803
 804         fh_init(&resfh, NFS4_FHSIZE);
 805         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 806         if (err)
 807                 return err;
 808         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 809                                     secinfo->si_name, secinfo->si_namelen,
 810                                     &exp, &dentry);
 811         if (err)
 812                 return err;
 813         if (dentry->d_inode == NULL) {
 814                 exp_put(exp);
 815                 err = nfserr_noent;
 816         } else
 817                 secinfo->si_exp = exp;
 818         dput(dentry);
 819         if (cstate->minorversion)
 820                 /* See rfc 5661 section 2.6.3.1.1.8 */
 821                 fh_put(&cstate->current_fh);
 822         return err;
 823 }
 824
 825 static __be32
 826 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 827               struct nfsd4_secinfo_no_name *sin)
 828 {
 829         __be32 err;
 830
 831         switch (sin->sin_style) {
 832         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 833                 break;
 834         case NFS4_SECINFO_STYLE4_PARENT:
 835                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 836                 if (err)
 837                         return err;
 838                 break;
 839         default:
 840                 return nfserr_inval;
 841         }
 842         exp_get(cstate->current_fh.fh_export);
 843         sin->sin_exp = cstate->current_fh.fh_export;
 844         fh_put(&cstate->current_fh);
 845         return nfs_ok;
 846 }
 847
 848 static __be32
 849 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 850               struct nfsd4_setattr *setattr)
 851 {
 852         __be32 status = nfs_ok;
 853         int err;
 854
 855         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 856                 nfs4_lock_state();
 857                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 858                         &setattr->sa_stateid, WR_STATE, NULL);
 859                 nfs4_unlock_state();
 860                 if (status) {
 861                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 862                         return status;
 863                 }
 864         }
 865         err = fh_want_write(&cstate->current_fh);
 866         if (err)
 867                 return nfserrno(err);
 868         status = nfs_ok;
 869
 870         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 871                                     nfsd_attrmask);
 872         if (status)
 873                 goto out;
 874
 875         if (setattr->sa_acl != NULL)
 876                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 877                                             setattr->sa_acl);
 878         if (status)
 879                 goto out;
 880         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 881                                 0, (time_t)0);
 882 out:
 883         fh_drop_write(&cstate->current_fh);
 884         return status;
 885 }
 886
 887 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 888 {
 889         int i = 1;
 890         int buflen = write->wr_buflen;
 891
 892         vec[0].iov_base = write->wr_head.iov_base;
 893         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 894         buflen -= vec[0].iov_len;
 895
 896         while (buflen) {
 897                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 898                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 899                 buflen -= vec[i].iov_len;
 900                 i++;
 901         }
 902         return i;
 903 }
 904
 905 static __be32
 906 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 907             struct nfsd4_write *write)
 908 {
 909         stateid_t *stateid = &write->wr_stateid;
 910         struct file *filp = NULL;
 911         __be32 status = nfs_ok;
 912         unsigned long cnt;
 913         int nvecs;
 914
 915         /* no need to check permission - this will be done in nfsd_write() */
 916
 917         if (write->wr_offset >= OFFSET_MAX)
 918                 return nfserr_inval;
 919
 920         nfs4_lock_state();
 921         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 922                                         cstate, stateid, WR_STATE, &filp);
 923         if (filp)
 924                 get_file(filp);
 925         nfs4_unlock_state();
 926
 927         if (status) {
 928                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 929                 return status;
 930         }
 931
 932         cnt = write->wr_buflen;
 933         write->wr_how_written = write->wr_stable_how;
 934         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 935
 936         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
 937         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 938
 939         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 940                              write->wr_offset, rqstp->rq_vec, nvecs,
 941                              &cnt, &write->wr_how_written);
 942         if (filp)
 943                 fput(filp);
 944
 945         write->wr_bytes_written = cnt;
 946
 947         return status;
 948 }
 949
 950 /* This routine never returns NFS_OK!  If there are no other errors, it
 951  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 952  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 953  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 954  */
 955 static __be32
 956 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 957              struct nfsd4_verify *verify)
 958 {
 959         __be32 *buf, *p;
 960         int count;
 961         __be32 status;
 962
 963         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 964         if (status)
 965                 return status;
 966
 967         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 968         if (status)
 969                 return status;
 970
 971         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 972             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 973                 return nfserr_inval;
 974         if (verify->ve_attrlen & 3)
 975                 return nfserr_inval;
 976
 977         /* count in words:
 978          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 979          */
 980         count = 4 + (verify->ve_attrlen >> 2);
 981         buf = kmalloc(count << 2, GFP_KERNEL);
 982         if (!buf)
 983                 return nfserr_jukebox;
 984
 985         status = nfsd4_encode_fattr(&cstate->current_fh,
 986                                     cstate->current_fh.fh_export,
 987                                     cstate->current_fh.fh_dentry, buf,
 988                                     &count, verify->ve_bmval,
 989                                     rqstp, 0);
 990
 991         /* this means that nfsd4_encode_fattr() ran out of space */
 992         if (status == nfserr_resource && count == 0)
 993                 status = nfserr_not_same;
 994         if (status)
 995                 goto out_kfree;
 996
 997         /* skip bitmap */
 998         p = buf + 1 + ntohl(buf[0]);
 999         status = nfserr_not_same;
1000         if (ntohl(*p++) != verify->ve_attrlen)
1001                 goto out_kfree;
1002         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1003                 status = nfserr_same;
1004
1005 out_kfree:
1006         kfree(buf);
1007         return status;
1008 }
1009
1010 static __be32
1011 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1012               struct nfsd4_verify *verify)
1013 {
1014         __be32 status;
1015
1016         status = _nfsd4_verify(rqstp, cstate, verify);
1017         return status == nfserr_not_same ? nfs_ok : status;
1018 }
1019
1020 static __be32
1021 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1022              struct nfsd4_verify *verify)
1023 {
1024         __be32 status;
1025
1026         status = _nfsd4_verify(rqstp, cstate, verify);
1027         return status == nfserr_same ? nfs_ok : status;
1028 }
1029
1030 /*
1031  * NULL call.
1032  */
1033 static __be32
1034 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1035 {
1036         return nfs_ok;
1037 }
1038
1039 static inline void nfsd4_increment_op_stats(u32 opnum)
1040 {
1041         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1042                 nfsdstats.nfs4_opcount[opnum]++;
1043 }
1044
1045 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1046                               void *);
1047 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1048 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1049 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1050
1051 enum nfsd4_op_flags {
1052         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1053         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1054         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1055         /* For rfc 5661 section 2.6.3.1.1: */
1056         OP_HANDLES_WRONGSEC = 1 << 3,
1057         OP_IS_PUTFH_LIKE = 1 << 4,
1058         /*
1059          * These are the ops whose result size we estimate before
1060          * encoding, to avoid performing an op then not being able to
1061          * respond or cache a response.  This includes writes and setattrs
1062          * as well as the operations usually called "nonidempotent":
1063          */
1064         OP_MODIFIES_SOMETHING = 1 << 5,
1065         /*
1066          * Cache compounds containing these ops in the xid-based drc:
1067          * We use the DRC for compounds containing non-idempotent
1068          * operations, *except* those that are 4.1-specific (since
1069          * sessions provide their own EOS), and except for stateful
1070          * operations other than setclientid and setclientid_confirm
1071          * (since sequence numbers provide EOS for open, lock, etc in
1072          * the v4.0 case).
1073          */
1074         OP_CACHEME = 1 << 6,
1075         /*
1076          * These are ops which clear current state id.
1077          */
1078         OP_CLEAR_STATEID = 1 << 7,
1079 };
1080
1081 struct nfsd4_operation {
1082         nfsd4op_func op_func;
1083         u32 op_flags;
1084         char *op_name;
1085         /* Try to get response size before operation */
1086         nfsd4op_rsize op_rsize_bop;
1087         stateid_getter op_get_currentstateid;
1088         stateid_setter op_set_currentstateid;
1089 };
1090
1091 static struct nfsd4_operation nfsd4_ops[];
1092
1093 #ifdef NFSD_DEBUG
1094 static const char *nfsd4_op_name(unsigned opnum);
1095 #endif
1096
1097 /*
1098  * Enforce NFSv4.1 COMPOUND ordering rules:
1099  *
1100  * Also note, enforced elsewhere:
1101  *      - SEQUENCE other than as first op results in
1102  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1103  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1104  *        (Enforced in nfsd4_bind_conn_to_session().)
1105  *      - DESTROY_SESSION must be the final operation in a compound, if
1106  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1107  *        (Enforced in nfsd4_destroy_session().)
1108  */
1109 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1110 {
1111         struct nfsd4_op *op = &args->ops[0];
1112
1113         /* These ordering requirements don't apply to NFSv4.0: */
1114         if (args->minorversion == 0)
1115                 return nfs_ok;
1116         /* This is weird, but OK, not our problem: */
1117         if (args->opcnt == 0)
1118                 return nfs_ok;
1119         if (op->status == nfserr_op_illegal)
1120                 return nfs_ok;
1121         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1122                 return nfserr_op_not_in_session;
1123         if (op->opnum == OP_SEQUENCE)
1124                 return nfs_ok;
1125         if (args->opcnt != 1)
1126                 return nfserr_not_only_op;
1127         return nfs_ok;
1128 }
1129
1130 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1131 {
1132         return &nfsd4_ops[op->opnum];
1133 }
1134
1135 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1136 {
1137         return OPDESC(op)->op_flags & OP_CACHEME;
1138 }
1139
1140 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1141 {
1142         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1143         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1144         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1145         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1146         struct nfsd4_operation *thisd;
1147         struct nfsd4_operation *nextd;
1148
1149         thisd = OPDESC(this);
1150         /*
1151          * Most ops check wronsec on our own; only the putfh-like ops
1152          * have special rules.
1153          */
1154         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1155                 return false;
1156         /*
1157          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1158          * put-filehandle operation if we're not going to use the
1159          * result:
1160          */
1161         if (argp->opcnt == resp->opcnt)
1162                 return false;
1163
1164         nextd = OPDESC(next);
1165         /*
1166          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1167          * errors themselves as necessary; others should check for them
1168          * now:
1169          */
1170         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1171 }
1172
1173 /*
1174  * COMPOUND call.
1175  */
1176 static __be32
1177 nfsd4_proc_compound(struct svc_rqst *rqstp,
1178                     struct nfsd4_compoundargs *args,
1179                     struct nfsd4_compoundres *resp)
1180 {
1181         struct nfsd4_op *op;
1182         struct nfsd4_operation *opdesc;
1183         struct nfsd4_compound_state *cstate = &resp->cstate;
1184         int             slack_bytes;
1185         u32             plen = 0;
1186         __be32          status;
1187
1188         resp->xbuf = &rqstp->rq_res;
1189         resp->p = rqstp->rq_res.head[0].iov_base +
1190                                                 rqstp->rq_res.head[0].iov_len;
1191         resp->tagp = resp->p;
1192         /* reserve space for: taglen, tag, and opcnt */
1193         resp->p += 2 + XDR_QUADLEN(args->taglen);
1194         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1195         resp->taglen = args->taglen;
1196         resp->tag = args->tag;
1197         resp->opcnt = 0;
1198         resp->rqstp = rqstp;
1199         resp->cstate.minorversion = args->minorversion;
1200         resp->cstate.replay_owner = NULL;
1201         resp->cstate.session = NULL;
1202         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1203         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1204         /*
1205          * Don't use the deferral mechanism for NFSv4; compounds make it
1206          * too hard to avoid non-idempotency problems.
1207          */
1208         rqstp->rq_usedeferral = 0;
1209
1210         /*
1211          * According to RFC3010, this takes precedence over all other errors.
1212          */
1213         status = nfserr_minor_vers_mismatch;
1214         if (args->minorversion > nfsd_supported_minorversion)
1215                 goto out;
1216
1217         status = nfs41_check_op_ordering(args);
1218         if (status) {
1219                 op = &args->ops[0];
1220                 op->status = status;
1221                 goto encode_op;
1222         }
1223
1224         while (!status && resp->opcnt < args->opcnt) {
1225                 op = &args->ops[resp->opcnt++];
1226
1227                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1228                         resp->opcnt, args->opcnt, op->opnum,
1229                         nfsd4_op_name(op->opnum));
1230                 /*
1231                  * The XDR decode routines may have pre-set op->status;
1232                  * for example, if there is a miscellaneous XDR error
1233                  * it will be set to nfserr_bad_xdr.
1234                  */
1235                 if (op->status)
1236                         goto encode_op;
1237
1238                 /* We must be able to encode a successful response to
1239                  * this operation, with enough room left over to encode a
1240                  * failed response to the next operation.  If we don't
1241                  * have enough room, fail with ERR_RESOURCE.
1242                  */
1243                 slack_bytes = (char *)resp->end - (char *)resp->p;
1244                 if (slack_bytes < COMPOUND_SLACK_SPACE
1245                                 + COMPOUND_ERR_SLACK_SPACE) {
1246                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1247                         op->status = nfserr_resource;
1248                         goto encode_op;
1249                 }
1250
1251                 opdesc = OPDESC(op);
1252
1253                 if (!cstate->current_fh.fh_dentry) {
1254                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1255                                 op->status = nfserr_nofilehandle;
1256                                 goto encode_op;
1257                         }
1258                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1259                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1260                         op->status = nfserr_moved;
1261                         goto encode_op;
1262                 }
1263
1264                 /* If op is non-idempotent */
1265                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1266                         plen = opdesc->op_rsize_bop(rqstp, op);
1267                         op->status = nfsd4_check_resp_size(resp, plen);
1268                 }
1269
1270                 if (op->status)
1271                         goto encode_op;
1272
1273                 if (opdesc->op_func) {
1274                         if (opdesc->op_get_currentstateid)
1275                                 opdesc->op_get_currentstateid(cstate, &op->u);
1276                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1277                 } else
1278                         BUG_ON(op->status == nfs_ok);
1279
1280                 if (!op->status) {
1281                         if (opdesc->op_set_currentstateid)
1282                                 opdesc->op_set_currentstateid(cstate, &op->u);
1283
1284                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1285                                 clear_current_stateid(cstate);
1286
1287                         if (need_wrongsec_check(rqstp))
1288                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1289                 }
1290
1291 encode_op:
1292                 /* Only from SEQUENCE */
1293                 if (resp->cstate.status == nfserr_replay_cache) {
1294                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1295                         status = op->status;
1296                         goto out;
1297                 }
1298                 if (op->status == nfserr_replay_me) {
1299                         op->replay = &cstate->replay_owner->so_replay;
1300                         nfsd4_encode_replay(resp, op);
1301                         status = op->status = op->replay->rp_status;
1302                 } else {
1303                         nfsd4_encode_operation(resp, op);
1304                         status = op->status;
1305                 }
1306
1307                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1308                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1309                         be32_to_cpu(status));
1310
1311                 if (cstate->replay_owner) {
1312                         nfs4_unlock_state();
1313                         cstate->replay_owner = NULL;
1314                 }
1315                 /* XXX Ugh, we need to get rid of this kind of special case: */
1316                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1317                         fput(op->u.read.rd_filp);
1318
1319                 nfsd4_increment_op_stats(op->opnum);
1320         }
1321
1322         resp->cstate.status = status;
1323         fh_put(&resp->cstate.current_fh);
1324         fh_put(&resp->cstate.save_fh);
1325         BUG_ON(resp->cstate.replay_owner);
1326 out:
1327         /* Reset deferral mechanism for RPC deferrals */
1328         rqstp->rq_usedeferral = 1;
1329         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1330         return status;
1331 }
1332
1333 #define op_encode_hdr_size              (2)
1334 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1335 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1336 #define op_encode_change_info_maxsz     (5)
1337 #define nfs4_fattr_bitmap_maxsz         (4)
1338
1339 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1340 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1341
1342 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1343
1344 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1345 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1346                                          op_encode_ace_maxsz)
1347
1348 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1349
1350 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1351 {
1352         return (op_encode_hdr_size) * sizeof(__be32);
1353 }
1354
1355 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1356 {
1357         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1358 }
1359
1360 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1361 {
1362         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1363 }
1364
1365 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1366 {
1367         return (op_encode_hdr_size + op_encode_change_info_maxsz
1368                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1369 }
1370
1371 static inline u32 nfsd4_link_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_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1378 {
1379         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1380                 * sizeof(__be32);
1381 }
1382
1383 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1384 {
1385         return (op_encode_hdr_size + op_encode_stateid_maxsz
1386                 + op_encode_change_info_maxsz + 1
1387                 + nfs4_fattr_bitmap_maxsz
1388                 + op_encode_delegation_maxsz) * sizeof(__be32);
1389 }
1390
1391 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1392 {
1393         u32 maxcount = 0, rlen = 0;
1394
1395         maxcount = svc_max_payload(rqstp);
1396         rlen = op->u.read.rd_length;
1397
1398         if (rlen > maxcount)
1399                 rlen = maxcount;
1400
1401         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1402 }
1403
1404 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1405 {
1406         u32 rlen = op->u.readdir.rd_maxcount;
1407
1408         if (rlen > PAGE_SIZE)
1409                 rlen = PAGE_SIZE;
1410
1411         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1412                  * sizeof(__be32) + rlen;
1413 }
1414
1415 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1416 {
1417         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1418                 * sizeof(__be32);
1419 }
1420
1421 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1422 {
1423         return (op_encode_hdr_size + op_encode_change_info_maxsz
1424                 + op_encode_change_info_maxsz) * sizeof(__be32);
1425 }
1426
1427 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1428 {
1429         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1430 }
1431
1432 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1433 {
1434         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1435 }
1436
1437 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1438 {
1439         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1440 }
1441
1442 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1443 {
1444         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1445                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1446                 2 + /*eir_server_owner.so_minor_id */\
1447                 /* eir_server_owner.so_major_id<> */\
1448                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1449                 /* eir_server_scope<> */\
1450                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1451                 1 + /* eir_server_impl_id array length */\
1452                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1453 }
1454
1455 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1456 {
1457         return (op_encode_hdr_size + \
1458                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1459                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1460 }
1461
1462 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1463 {
1464         return (op_encode_hdr_size + \
1465                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1466                 2 + /* csr_sequence, csr_flags */\
1467                 op_encode_channel_attrs_maxsz + \
1468                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1469 }
1470
1471 static struct nfsd4_operation nfsd4_ops[] = {
1472         [OP_ACCESS] = {
1473                 .op_func = (nfsd4op_func)nfsd4_access,
1474                 .op_name = "OP_ACCESS",
1475         },
1476         [OP_CLOSE] = {
1477                 .op_func = (nfsd4op_func)nfsd4_close,
1478                 .op_flags = OP_MODIFIES_SOMETHING,
1479                 .op_name = "OP_CLOSE",
1480                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1481                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1482                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1483         },
1484         [OP_COMMIT] = {
1485                 .op_func = (nfsd4op_func)nfsd4_commit,
1486                 .op_flags = OP_MODIFIES_SOMETHING,
1487                 .op_name = "OP_COMMIT",
1488                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1489         },
1490         [OP_CREATE] = {
1491                 .op_func = (nfsd4op_func)nfsd4_create,
1492                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1493                 .op_name = "OP_CREATE",
1494                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1495         },
1496         [OP_DELEGRETURN] = {
1497                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1498                 .op_flags = OP_MODIFIES_SOMETHING,
1499                 .op_name = "OP_DELEGRETURN",
1500                 .op_rsize_bop = nfsd4_only_status_rsize,
1501                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1502         },
1503         [OP_GETATTR] = {
1504                 .op_func = (nfsd4op_func)nfsd4_getattr,
1505                 .op_flags = ALLOWED_ON_ABSENT_FS,
1506                 .op_name = "OP_GETATTR",
1507         },
1508         [OP_GETFH] = {
1509                 .op_func = (nfsd4op_func)nfsd4_getfh,
1510                 .op_name = "OP_GETFH",
1511         },
1512         [OP_LINK] = {
1513                 .op_func = (nfsd4op_func)nfsd4_link,
1514                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1515                                 | OP_CACHEME,
1516                 .op_name = "OP_LINK",
1517                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1518         },
1519         [OP_LOCK] = {
1520                 .op_func = (nfsd4op_func)nfsd4_lock,
1521                 .op_flags = OP_MODIFIES_SOMETHING,
1522                 .op_name = "OP_LOCK",
1523                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1524                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1525         },
1526         [OP_LOCKT] = {
1527                 .op_func = (nfsd4op_func)nfsd4_lockt,
1528                 .op_name = "OP_LOCKT",
1529         },
1530         [OP_LOCKU] = {
1531                 .op_func = (nfsd4op_func)nfsd4_locku,
1532                 .op_flags = OP_MODIFIES_SOMETHING,
1533                 .op_name = "OP_LOCKU",
1534                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1535                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1536         },
1537         [OP_LOOKUP] = {
1538                 .op_func = (nfsd4op_func)nfsd4_lookup,
1539                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1540                 .op_name = "OP_LOOKUP",
1541         },
1542         [OP_LOOKUPP] = {
1543                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1544                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1545                 .op_name = "OP_LOOKUPP",
1546         },
1547         [OP_NVERIFY] = {
1548                 .op_func = (nfsd4op_func)nfsd4_nverify,
1549                 .op_name = "OP_NVERIFY",
1550         },
1551         [OP_OPEN] = {
1552                 .op_func = (nfsd4op_func)nfsd4_open,
1553                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1554                 .op_name = "OP_OPEN",
1555                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1556                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1557         },
1558         [OP_OPEN_CONFIRM] = {
1559                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1560                 .op_flags = OP_MODIFIES_SOMETHING,
1561                 .op_name = "OP_OPEN_CONFIRM",
1562                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1563         },
1564         [OP_OPEN_DOWNGRADE] = {
1565                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1566                 .op_flags = OP_MODIFIES_SOMETHING,
1567                 .op_name = "OP_OPEN_DOWNGRADE",
1568                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1569                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1570                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1571         },
1572         [OP_PUTFH] = {
1573                 .op_func = (nfsd4op_func)nfsd4_putfh,
1574                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1575                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1576                                 | OP_CLEAR_STATEID,
1577                 .op_name = "OP_PUTFH",
1578                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1579         },
1580         [OP_PUTPUBFH] = {
1581                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1582                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1583                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1584                                 | OP_CLEAR_STATEID,
1585                 .op_name = "OP_PUTPUBFH",
1586                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1587         },
1588         [OP_PUTROOTFH] = {
1589                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1590                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1591                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1592                                 | OP_CLEAR_STATEID,
1593                 .op_name = "OP_PUTROOTFH",
1594                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1595         },
1596         [OP_READ] = {
1597                 .op_func = (nfsd4op_func)nfsd4_read,
1598                 .op_flags = OP_MODIFIES_SOMETHING,
1599                 .op_name = "OP_READ",
1600                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1601                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1602         },
1603         [OP_READDIR] = {
1604                 .op_func = (nfsd4op_func)nfsd4_readdir,
1605                 .op_flags = OP_MODIFIES_SOMETHING,
1606                 .op_name = "OP_READDIR",
1607                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1608         },
1609         [OP_READLINK] = {
1610                 .op_func = (nfsd4op_func)nfsd4_readlink,
1611                 .op_name = "OP_READLINK",
1612         },
1613         [OP_REMOVE] = {
1614                 .op_func = (nfsd4op_func)nfsd4_remove,
1615                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1616                 .op_name = "OP_REMOVE",
1617                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1618         },
1619         [OP_RENAME] = {
1620                 .op_func = (nfsd4op_func)nfsd4_rename,
1621                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1622                 .op_name = "OP_RENAME",
1623                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1624         },
1625         [OP_RENEW] = {
1626                 .op_func = (nfsd4op_func)nfsd4_renew,
1627                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1628                                 | OP_MODIFIES_SOMETHING,
1629                 .op_name = "OP_RENEW",
1630                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1631
1632         },
1633         [OP_RESTOREFH] = {
1634                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1635                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1636                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1637                 .op_name = "OP_RESTOREFH",
1638                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1639         },
1640         [OP_SAVEFH] = {
1641                 .op_func = (nfsd4op_func)nfsd4_savefh,
1642                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1643                 .op_name = "OP_SAVEFH",
1644                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1645         },
1646         [OP_SECINFO] = {
1647                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1648                 .op_flags = OP_HANDLES_WRONGSEC,
1649                 .op_name = "OP_SECINFO",
1650         },
1651         [OP_SETATTR] = {
1652                 .op_func = (nfsd4op_func)nfsd4_setattr,
1653                 .op_name = "OP_SETATTR",
1654                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1655                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1656                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1657         },
1658         [OP_SETCLIENTID] = {
1659                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1660                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1661                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1662                 .op_name = "OP_SETCLIENTID",
1663                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1664         },
1665         [OP_SETCLIENTID_CONFIRM] = {
1666                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1667                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1668                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1669                 .op_name = "OP_SETCLIENTID_CONFIRM",
1670                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1671         },
1672         [OP_VERIFY] = {
1673                 .op_func = (nfsd4op_func)nfsd4_verify,
1674                 .op_name = "OP_VERIFY",
1675         },
1676         [OP_WRITE] = {
1677                 .op_func = (nfsd4op_func)nfsd4_write,
1678                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1679                 .op_name = "OP_WRITE",
1680                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1681                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1682         },
1683         [OP_RELEASE_LOCKOWNER] = {
1684                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1685                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1686                                 | OP_MODIFIES_SOMETHING,
1687                 .op_name = "OP_RELEASE_LOCKOWNER",
1688                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1689         },
1690
1691         /* NFSv4.1 operations */
1692         [OP_EXCHANGE_ID] = {
1693                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1694                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1695                                 | OP_MODIFIES_SOMETHING,
1696                 .op_name = "OP_EXCHANGE_ID",
1697                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1698         },
1699         [OP_BACKCHANNEL_CTL] = {
1700                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1701                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1702                 .op_name = "OP_BACKCHANNEL_CTL",
1703                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1704         },
1705         [OP_BIND_CONN_TO_SESSION] = {
1706                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1707                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1708                                 | OP_MODIFIES_SOMETHING,
1709                 .op_name = "OP_BIND_CONN_TO_SESSION",
1710                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1711         },
1712         [OP_CREATE_SESSION] = {
1713                 .op_func = (nfsd4op_func)nfsd4_create_session,
1714                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1715                                 | OP_MODIFIES_SOMETHING,
1716                 .op_name = "OP_CREATE_SESSION",
1717                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1718         },
1719         [OP_DESTROY_SESSION] = {
1720                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1721                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1722                                 | OP_MODIFIES_SOMETHING,
1723                 .op_name = "OP_DESTROY_SESSION",
1724                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1725         },
1726         [OP_SEQUENCE] = {
1727                 .op_func = (nfsd4op_func)nfsd4_sequence,
1728                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1729                 .op_name = "OP_SEQUENCE",
1730         },
1731         [OP_DESTROY_CLIENTID] = {
1732                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1733                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1734                                 | OP_MODIFIES_SOMETHING,
1735                 .op_name = "OP_DESTROY_CLIENTID",
1736                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1737         },
1738         [OP_RECLAIM_COMPLETE] = {
1739                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1740                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1741                 .op_name = "OP_RECLAIM_COMPLETE",
1742                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1743         },
1744         [OP_SECINFO_NO_NAME] = {
1745                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1746                 .op_flags = OP_HANDLES_WRONGSEC,
1747                 .op_name = "OP_SECINFO_NO_NAME",
1748         },
1749         [OP_TEST_STATEID] = {
1750                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1751                 .op_flags = ALLOWED_WITHOUT_FH,
1752                 .op_name = "OP_TEST_STATEID",
1753         },
1754         [OP_FREE_STATEID] = {
1755                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1756                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1757                 .op_name = "OP_FREE_STATEID",
1758                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1759         },
1760 };
1761
1762 #ifdef NFSD_DEBUG
1763 static const char *nfsd4_op_name(unsigned opnum)
1764 {
1765         if (opnum < ARRAY_SIZE(nfsd4_ops))
1766                 return nfsd4_ops[opnum].op_name;
1767         return "unknown_operation";
1768 }
1769 #endif
1770
1771 #define nfsd4_voidres                   nfsd4_voidargs
1772 struct nfsd4_voidargs { int dummy; };
1773
1774 static struct svc_procedure             nfsd_procedures4[2] = {
1775         [NFSPROC4_NULL] = {
1776                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1777                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1778                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1779                 .pc_ressize = sizeof(struct nfsd4_voidres),
1780                 .pc_cachetype = RC_NOCACHE,
1781                 .pc_xdrressize = 1,
1782         },
1783         [NFSPROC4_COMPOUND] = {
1784                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1785                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1786                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1787                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1788                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1789                 .pc_release = nfsd4_release_compoundargs,
1790                 .pc_cachetype = RC_NOCACHE,
1791                 .pc_xdrressize = NFSD_BUFSIZE/4,
1792         },
1793 };
1794
1795 struct svc_version      nfsd_version4 = {
1796                 .vs_vers        = 4,
1797                 .vs_nproc       = 2,
1798                 .vs_proc        = nfsd_procedures4,
1799                 .vs_dispatch    = nfsd_dispatch,
1800                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1801 };
1802
1803 /*
1804  * Local variables:
1805  *  c-basic-offset: 8
1806  * End:
1807  */