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 void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 195 {
 196         if (nfsd4_has_session(cstate))
 197                 return;
 198         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 199                         &resfh->fh_handle);
 200 }
 201
 202 static __be32
 203 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 204 {
 205         struct svc_fh *current_fh = &cstate->current_fh;
 206         struct svc_fh *resfh;
 207         int accmode;
 208         __be32 status;
 209
 210         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 211         if (!resfh)
 212                 return nfserr_jukebox;
 213         fh_init(resfh, NFS4_FHSIZE);
 214         open->op_truncate = 0;
 215
 216         if (open->op_create) {
 217                 /* FIXME: check session persistence and pnfs flags.
 218                  * The nfsv4.1 spec requires the following semantics:
 219                  *
 220                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 221                  * Reply Cache  | server |                 |
 222                  * -------------+--------+-----------------+--------------------
 223                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 224                  *              |        |                 | (SHOULD)
 225                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 226                  *              |        |                 | (SHOULD NOT)
 227                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 228                  * yes          | no     | GUARDED4        | GUARDED4
 229                  * yes          | yes    | GUARDED4        | GUARDED4
 230                  */
 231
 232                 /*
 233                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 234                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 235                  */
 236                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 237                                         open->op_fname.len, &open->op_iattr,
 238                                         resfh, open->op_createmode,
 239                                         (u32 *)open->op_verf.data,
 240                                         &open->op_truncate, &open->op_created);
 241
 242                 /*
 243                  * Following rfc 3530 14.2.16, use the returned bitmask
 244                  * to indicate which attributes we used to store the
 245                  * verifier:
 246                  */
 247                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 248                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 249                                                         FATTR4_WORD1_TIME_MODIFY);
 250         } else {
 251                 status = nfsd_lookup(rqstp, current_fh,
 252                                      open->op_fname.data, open->op_fname.len, resfh);
 253                 fh_unlock(current_fh);
 254         }
 255         if (status)
 256                 goto out;
 257         status = nfsd_check_obj_isreg(resfh);
 258         if (status)
 259                 goto out;
 260
 261         if (is_create_with_attrs(open) && open->op_acl != NULL)
 262                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 263
 264         nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
 265         accmode = NFSD_MAY_NOP;
 266         if (open->op_created)
 267                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 268         status = do_open_permission(rqstp, resfh, open, accmode);
 269         set_change_info(&open->op_cinfo, current_fh);
 270         fh_dup2(current_fh, resfh);
 271 out:
 272         fh_put(resfh);
 273         kfree(resfh);
 274         return status;
 275 }
 276
 277 static __be32
 278 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 279 {
 280         struct svc_fh *current_fh = &cstate->current_fh;
 281         __be32 status;
 282         int accmode = 0;
 283
 284         /* We don't know the target directory, and therefore can not
 285         * set the change info
 286         */
 287
 288         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 289
 290         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 291
 292         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 293                 (open->op_iattr.ia_size == 0);
 294         /*
 295          * In the delegation case, the client is telling us about an
 296          * open that it *already* performed locally, some time ago.  We
 297          * should let it succeed now if possible.
 298          *
 299          * In the case of a CLAIM_FH open, on the other hand, the client
 300          * may be counting on us to enforce permissions (the Linux 4.1
 301          * client uses this for normal opens, for example).
 302          */
 303         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 304                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 305
 306         status = do_open_permission(rqstp, current_fh, open, accmode);
 307
 308         return status;
 309 }
 310
 311 static void
 312 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 313 {
 314         struct nfsd4_sessionid *sid =
 315                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 316
 317         clid->cl_boot = sid->clientid.cl_boot;
 318         clid->cl_id = sid->clientid.cl_id;
 319 }
 320
 321 static __be32
 322 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 323            struct nfsd4_open *open)
 324 {
 325         __be32 status;
 326         struct nfsd4_compoundres *resp;
 327         struct net *net = SVC_NET(rqstp);
 328         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 329
 330         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 331                 (int)open->op_fname.len, open->op_fname.data,
 332                 open->op_openowner);
 333
 334         /* This check required by spec. */
 335         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 336                 return nfserr_inval;
 337
 338         open->op_created = 0;
 339         /*
 340          * RFC5661 18.51.3
 341          * Before RECLAIM_COMPLETE done, server should deny new lock
 342          */
 343         if (nfsd4_has_session(cstate) &&
 344             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 345                       &cstate->session->se_client->cl_flags) &&
 346             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 347                 return nfserr_grace;
 348
 349         if (nfsd4_has_session(cstate))
 350                 copy_clientid(&open->op_clientid, cstate->session);
 351
 352         nfs4_lock_state();
 353
 354         /* check seqid for replay. set nfs4_owner */
 355         resp = rqstp->rq_resp;
 356         status = nfsd4_process_open1(&resp->cstate, open, nn);
 357         if (status == nfserr_replay_me) {
 358                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 359                 fh_put(&cstate->current_fh);
 360                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 361                                 &rp->rp_openfh);
 362                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 363                 if (status)
 364                         dprintk("nfsd4_open: replay failed"
 365                                 " restoring previous filehandle\n");
 366                 else
 367                         status = nfserr_replay_me;
 368         }
 369         if (status)
 370                 goto out;
 371         if (open->op_xdr_error) {
 372                 status = open->op_xdr_error;
 373                 goto out;
 374         }
 375
 376         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 377         if (status)
 378                 goto out;
 379
 380         /* Openowner is now set, so sequence id will get bumped.  Now we need
 381          * these checks before we do any creates: */
 382         status = nfserr_grace;
 383         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 384                 goto out;
 385         status = nfserr_no_grace;
 386         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 387                 goto out;
 388
 389         switch (open->op_claim_type) {
 390                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 391                 case NFS4_OPEN_CLAIM_NULL:
 392                         status = do_open_lookup(rqstp, cstate, open);
 393                         if (status)
 394                                 goto out;
 395                         break;
 396                 case NFS4_OPEN_CLAIM_PREVIOUS:
 397                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 398                         status = nfs4_check_open_reclaim(&open->op_clientid,
 399                                                          cstate->minorversion,
 400                                                          nn);
 401                         if (status)
 402                                 goto out;
 403                 case NFS4_OPEN_CLAIM_FH:
 404                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 405                         status = do_open_fhandle(rqstp, cstate, open);
 406                         if (status)
 407                                 goto out;
 408                         break;
 409                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 410                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 411                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 412                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 413                                 open->op_claim_type);
 414                         status = nfserr_notsupp;
 415                         goto out;
 416                 default:
 417                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 418                                 open->op_claim_type);
 419                         status = nfserr_inval;
 420                         goto out;
 421         }
 422         /*
 423          * nfsd4_process_open2() does the actual opening of the file.  If
 424          * successful, it (1) truncates the file if open->op_truncate was
 425          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 426          */
 427         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 428         WARN_ON(status && open->op_created);
 429 out:
 430         nfsd4_cleanup_open_state(open, status);
 431         if (open->op_openowner && !nfsd4_has_session(cstate))
 432                 cstate->replay_owner = &open->op_openowner->oo_owner;
 433         nfsd4_bump_seqid(cstate, status);
 434         if (!cstate->replay_owner)
 435                 nfs4_unlock_state();
 436         return status;
 437 }
 438
 439 /*
 440  * OPEN is the only seqid-mutating operation whose decoding can fail
 441  * with a seqid-mutating error (specifically, decoding of user names in
 442  * the attributes).  Therefore we have to do some processing to look up
 443  * the stateowner so that we can bump the seqid.
 444  */
 445 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 446 {
 447         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 448
 449         if (!seqid_mutating_err(ntohl(op->status)))
 450                 return op->status;
 451         if (nfsd4_has_session(cstate))
 452                 return op->status;
 453         open->op_xdr_error = op->status;
 454         return nfsd4_open(rqstp, cstate, open);
 455 }
 456
 457 /*
 458  * filehandle-manipulating ops.
 459  */
 460 static __be32
 461 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 462             struct svc_fh **getfh)
 463 {
 464         if (!cstate->current_fh.fh_dentry)
 465                 return nfserr_nofilehandle;
 466
 467         *getfh = &cstate->current_fh;
 468         return nfs_ok;
 469 }
 470
 471 static __be32
 472 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 473             struct nfsd4_putfh *putfh)
 474 {
 475         fh_put(&cstate->current_fh);
 476         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 477         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 478                putfh->pf_fhlen);
 479         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 480 }
 481
 482 static __be32
 483 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 484                 void *arg)
 485 {
 486         __be32 status;
 487
 488         fh_put(&cstate->current_fh);
 489         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 490         return status;
 491 }
 492
 493 static __be32
 494 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 495                 void *arg)
 496 {
 497         if (!cstate->save_fh.fh_dentry)
 498                 return nfserr_restorefh;
 499
 500         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 501         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 502                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 503                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 504         }
 505         return nfs_ok;
 506 }
 507
 508 static __be32
 509 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510              void *arg)
 511 {
 512         if (!cstate->current_fh.fh_dentry)
 513                 return nfserr_nofilehandle;
 514
 515         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 516         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 517                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 518                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 519         }
 520         return nfs_ok;
 521 }
 522
 523 /*
 524  * misc nfsv4 ops
 525  */
 526 static __be32
 527 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 528              struct nfsd4_access *access)
 529 {
 530         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 531                 return nfserr_inval;
 532
 533         access->ac_resp_access = access->ac_req_access;
 534         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 535                            &access->ac_supported);
 536 }
 537
 538 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 539 {
 540         __be32 verf[2];
 541         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 542
 543         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 544         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 545         memcpy(verifier->data, verf, sizeof(verifier->data));
 546 }
 547
 548 static __be32
 549 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 550              struct nfsd4_commit *commit)
 551 {
 552         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 553         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 554                              commit->co_count);
 555 }
 556
 557 static __be32
 558 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 559              struct nfsd4_create *create)
 560 {
 561         struct svc_fh resfh;
 562         __be32 status;
 563         dev_t rdev;
 564
 565         fh_init(&resfh, NFS4_FHSIZE);
 566
 567         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 568                            NFSD_MAY_CREATE);
 569         if (status)
 570                 return status;
 571
 572         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 573                                     nfsd_attrmask);
 574         if (status)
 575                 return status;
 576
 577         switch (create->cr_type) {
 578         case NF4LNK:
 579                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 580                                       create->cr_name, create->cr_namelen,
 581                                       create->cr_linkname, create->cr_linklen,
 582                                       &resfh, &create->cr_iattr);
 583                 break;
 584
 585         case NF4BLK:
 586                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 587                 if (MAJOR(rdev) != create->cr_specdata1 ||
 588                     MINOR(rdev) != create->cr_specdata2)
 589                         return nfserr_inval;
 590                 status = nfsd_create(rqstp, &cstate->current_fh,
 591                                      create->cr_name, create->cr_namelen,
 592                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 593                 break;
 594
 595         case NF4CHR:
 596                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 597                 if (MAJOR(rdev) != create->cr_specdata1 ||
 598                     MINOR(rdev) != create->cr_specdata2)
 599                         return nfserr_inval;
 600                 status = nfsd_create(rqstp, &cstate->current_fh,
 601                                      create->cr_name, create->cr_namelen,
 602                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 603                 break;
 604
 605         case NF4SOCK:
 606                 status = nfsd_create(rqstp, &cstate->current_fh,
 607                                      create->cr_name, create->cr_namelen,
 608                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 609                 break;
 610
 611         case NF4FIFO:
 612                 status = nfsd_create(rqstp, &cstate->current_fh,
 613                                      create->cr_name, create->cr_namelen,
 614                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 615                 break;
 616
 617         case NF4DIR:
 618                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 619                 status = nfsd_create(rqstp, &cstate->current_fh,
 620                                      create->cr_name, create->cr_namelen,
 621                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 622                 break;
 623
 624         default:
 625                 status = nfserr_badtype;
 626         }
 627
 628         if (status)
 629                 goto out;
 630
 631         if (create->cr_acl != NULL)
 632                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 633                                 create->cr_bmval);
 634
 635         fh_unlock(&cstate->current_fh);
 636         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 637         fh_dup2(&cstate->current_fh, &resfh);
 638 out:
 639         fh_put(&resfh);
 640         return status;
 641 }
 642
 643 static __be32
 644 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 645               struct nfsd4_getattr *getattr)
 646 {
 647         __be32 status;
 648
 649         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 650         if (status)
 651                 return status;
 652
 653         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 654                 return nfserr_inval;
 655
 656         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 657         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 658         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 659
 660         getattr->ga_fhp = &cstate->current_fh;
 661         return nfs_ok;
 662 }
 663
 664 static __be32
 665 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 666            struct nfsd4_link *link)
 667 {
 668         __be32 status = nfserr_nofilehandle;
 669
 670         if (!cstate->save_fh.fh_dentry)
 671                 return status;
 672         status = nfsd_link(rqstp, &cstate->current_fh,
 673                            link->li_name, link->li_namelen, &cstate->save_fh);
 674         if (!status)
 675                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 676         return status;
 677 }
 678
 679 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 680 {
 681         struct svc_fh tmp_fh;
 682         __be32 ret;
 683
 684         fh_init(&tmp_fh, NFS4_FHSIZE);
 685         ret = exp_pseudoroot(rqstp, &tmp_fh);
 686         if (ret)
 687                 return ret;
 688         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 689                 fh_put(&tmp_fh);
 690                 return nfserr_noent;
 691         }
 692         fh_put(&tmp_fh);
 693         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 694 }
 695
 696 static __be32
 697 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 698               void *arg)
 699 {
 700         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 701 }
 702
 703 static __be32
 704 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 705              struct nfsd4_lookup *lookup)
 706 {
 707         return nfsd_lookup(rqstp, &cstate->current_fh,
 708                            lookup->lo_name, lookup->lo_len,
 709                            &cstate->current_fh);
 710 }
 711
 712 static __be32
 713 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 714            struct nfsd4_read *read)
 715 {
 716         __be32 status;
 717
 718         /* no need to check permission - this will be done in nfsd_read() */
 719
 720         read->rd_filp = NULL;
 721         if (read->rd_offset >= OFFSET_MAX)
 722                 return nfserr_inval;
 723
 724         /*
 725          * If we do a zero copy read, then a client will see read data
 726          * that reflects the state of the file *after* performing the
 727          * following compound.
 728          *
 729          * To ensure proper ordering, we therefore turn off zero copy if
 730          * the client wants us to do more in this compound:
 731          */
 732         if (!nfsd4_last_compound_op(rqstp))
 733                 rqstp->rq_splice_ok = false;
 734
 735         nfs4_lock_state();
 736         /* check stateid */
 737         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 738                                                  cstate, &read->rd_stateid,
 739                                                  RD_STATE, &read->rd_filp))) {
 740                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 741                 goto out;
 742         }
 743         if (read->rd_filp)
 744                 get_file(read->rd_filp);
 745         status = nfs_ok;
 746 out:
 747         nfs4_unlock_state();
 748         read->rd_rqstp = rqstp;
 749         read->rd_fhp = &cstate->current_fh;
 750         return status;
 751 }
 752
 753 static __be32
 754 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 755               struct nfsd4_readdir *readdir)
 756 {
 757         u64 cookie = readdir->rd_cookie;
 758         static const nfs4_verifier zeroverf;
 759
 760         /* no need to check permission - this will be done in nfsd_readdir() */
 761
 762         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 763                 return nfserr_inval;
 764
 765         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 766         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 767         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 768
 769         if ((cookie == 1) || (cookie == 2) ||
 770             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 771                 return nfserr_bad_cookie;
 772
 773         readdir->rd_rqstp = rqstp;
 774         readdir->rd_fhp = &cstate->current_fh;
 775         return nfs_ok;
 776 }
 777
 778 static __be32
 779 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 780                struct nfsd4_readlink *readlink)
 781 {
 782         readlink->rl_rqstp = rqstp;
 783         readlink->rl_fhp = &cstate->current_fh;
 784         return nfs_ok;
 785 }
 786
 787 static __be32
 788 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 789              struct nfsd4_remove *remove)
 790 {
 791         __be32 status;
 792
 793         if (locks_in_grace(SVC_NET(rqstp)))
 794                 return nfserr_grace;
 795         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 796                              remove->rm_name, remove->rm_namelen);
 797         if (!status) {
 798                 fh_unlock(&cstate->current_fh);
 799                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 800         }
 801         return status;
 802 }
 803
 804 static __be32
 805 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 806              struct nfsd4_rename *rename)
 807 {
 808         __be32 status = nfserr_nofilehandle;
 809
 810         if (!cstate->save_fh.fh_dentry)
 811                 return status;
 812         if (locks_in_grace(SVC_NET(rqstp)) &&
 813                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 814                 return nfserr_grace;
 815         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 816                              rename->rn_snamelen, &cstate->current_fh,
 817                              rename->rn_tname, rename->rn_tnamelen);
 818         if (status)
 819                 return status;
 820         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 821         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 822         return nfs_ok;
 823 }
 824
 825 static __be32
 826 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 827               struct nfsd4_secinfo *secinfo)
 828 {
 829         struct svc_fh resfh;
 830         struct svc_export *exp;
 831         struct dentry *dentry;
 832         __be32 err;
 833
 834         fh_init(&resfh, NFS4_FHSIZE);
 835         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 836         if (err)
 837                 return err;
 838         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 839                                     secinfo->si_name, secinfo->si_namelen,
 840                                     &exp, &dentry);
 841         if (err)
 842                 return err;
 843         if (dentry->d_inode == NULL) {
 844                 exp_put(exp);
 845                 err = nfserr_noent;
 846         } else
 847                 secinfo->si_exp = exp;
 848         dput(dentry);
 849         if (cstate->minorversion)
 850                 /* See rfc 5661 section 2.6.3.1.1.8 */
 851                 fh_put(&cstate->current_fh);
 852         return err;
 853 }
 854
 855 static __be32
 856 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 857               struct nfsd4_secinfo_no_name *sin)
 858 {
 859         __be32 err;
 860
 861         switch (sin->sin_style) {
 862         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 863                 break;
 864         case NFS4_SECINFO_STYLE4_PARENT:
 865                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 866                 if (err)
 867                         return err;
 868                 break;
 869         default:
 870                 return nfserr_inval;
 871         }
 872         exp_get(cstate->current_fh.fh_export);
 873         sin->sin_exp = cstate->current_fh.fh_export;
 874         fh_put(&cstate->current_fh);
 875         return nfs_ok;
 876 }
 877
 878 static __be32
 879 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 880               struct nfsd4_setattr *setattr)
 881 {
 882         __be32 status = nfs_ok;
 883         int err;
 884
 885         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 886                 nfs4_lock_state();
 887                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 888                         &setattr->sa_stateid, WR_STATE, NULL);
 889                 nfs4_unlock_state();
 890                 if (status) {
 891                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 892                         return status;
 893                 }
 894         }
 895         err = fh_want_write(&cstate->current_fh);
 896         if (err)
 897                 return nfserrno(err);
 898         status = nfs_ok;
 899
 900         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 901                                     nfsd_attrmask);
 902         if (status)
 903                 goto out;
 904
 905         if (setattr->sa_acl != NULL)
 906                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 907                                             setattr->sa_acl);
 908         if (status)
 909                 goto out;
 910         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 911                                 0, (time_t)0);
 912 out:
 913         fh_drop_write(&cstate->current_fh);
 914         return status;
 915 }
 916
 917 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 918 {
 919         int i = 1;
 920         int buflen = write->wr_buflen;
 921
 922         vec[0].iov_base = write->wr_head.iov_base;
 923         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 924         buflen -= vec[0].iov_len;
 925
 926         while (buflen) {
 927                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 928                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 929                 buflen -= vec[i].iov_len;
 930                 i++;
 931         }
 932         return i;
 933 }
 934
 935 static __be32
 936 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 937             struct nfsd4_write *write)
 938 {
 939         stateid_t *stateid = &write->wr_stateid;
 940         struct file *filp = NULL;
 941         __be32 status = nfs_ok;
 942         unsigned long cnt;
 943         int nvecs;
 944
 945         /* no need to check permission - this will be done in nfsd_write() */
 946
 947         if (write->wr_offset >= OFFSET_MAX)
 948                 return nfserr_inval;
 949
 950         nfs4_lock_state();
 951         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 952                                         cstate, stateid, WR_STATE, &filp);
 953         if (status) {
 954                 nfs4_unlock_state();
 955                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 956                 return status;
 957         }
 958         if (filp)
 959                 get_file(filp);
 960         nfs4_unlock_state();
 961
 962         cnt = write->wr_buflen;
 963         write->wr_how_written = write->wr_stable_how;
 964         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 965
 966         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
 967         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 968
 969         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 970                              write->wr_offset, rqstp->rq_vec, nvecs,
 971                              &cnt, &write->wr_how_written);
 972         if (filp)
 973                 fput(filp);
 974
 975         write->wr_bytes_written = cnt;
 976
 977         return status;
 978 }
 979
 980 /* This routine never returns NFS_OK!  If there are no other errors, it
 981  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 982  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 983  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 984  */
 985 static __be32
 986 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 987              struct nfsd4_verify *verify)
 988 {
 989         __be32 *buf, *p;
 990         int count;
 991         __be32 status;
 992
 993         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 994         if (status)
 995                 return status;
 996
 997         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 998         if (status)
 999                 return status;
1000
1001         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1002             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1003                 return nfserr_inval;
1004         if (verify->ve_attrlen & 3)
1005                 return nfserr_inval;
1006
1007         /* count in words:
1008          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1009          */
1010         count = 4 + (verify->ve_attrlen >> 2);
1011         buf = kmalloc(count << 2, GFP_KERNEL);
1012         if (!buf)
1013                 return nfserr_jukebox;
1014
1015         p = buf;
1016         status = nfsd4_encode_fattr(&cstate->current_fh,
1017                                     cstate->current_fh.fh_export,
1018                                     cstate->current_fh.fh_dentry, &p,
1019                                     count, verify->ve_bmval,
1020                                     rqstp, 0);
1021
1022         /* this means that nfsd4_encode_fattr() ran out of space */
1023         if (status == nfserr_resource)
1024                 status = nfserr_not_same;
1025         if (status)
1026                 goto out_kfree;
1027
1028         /* skip bitmap */
1029         p = buf + 1 + ntohl(buf[0]);
1030         status = nfserr_not_same;
1031         if (ntohl(*p++) != verify->ve_attrlen)
1032                 goto out_kfree;
1033         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1034                 status = nfserr_same;
1035
1036 out_kfree:
1037         kfree(buf);
1038         return status;
1039 }
1040
1041 static __be32
1042 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1043               struct nfsd4_verify *verify)
1044 {
1045         __be32 status;
1046
1047         status = _nfsd4_verify(rqstp, cstate, verify);
1048         return status == nfserr_not_same ? nfs_ok : status;
1049 }
1050
1051 static __be32
1052 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1053              struct nfsd4_verify *verify)
1054 {
1055         __be32 status;
1056
1057         status = _nfsd4_verify(rqstp, cstate, verify);
1058         return status == nfserr_same ? nfs_ok : status;
1059 }
1060
1061 /*
1062  * NULL call.
1063  */
1064 static __be32
1065 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1066 {
1067         return nfs_ok;
1068 }
1069
1070 static inline void nfsd4_increment_op_stats(u32 opnum)
1071 {
1072         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1073                 nfsdstats.nfs4_opcount[opnum]++;
1074 }
1075
1076 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1077                               void *);
1078 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1079 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1080 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1081
1082 enum nfsd4_op_flags {
1083         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1084         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1085         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1086         /* For rfc 5661 section 2.6.3.1.1: */
1087         OP_HANDLES_WRONGSEC = 1 << 3,
1088         OP_IS_PUTFH_LIKE = 1 << 4,
1089         /*
1090          * These are the ops whose result size we estimate before
1091          * encoding, to avoid performing an op then not being able to
1092          * respond or cache a response.  This includes writes and setattrs
1093          * as well as the operations usually called "nonidempotent":
1094          */
1095         OP_MODIFIES_SOMETHING = 1 << 5,
1096         /*
1097          * Cache compounds containing these ops in the xid-based drc:
1098          * We use the DRC for compounds containing non-idempotent
1099          * operations, *except* those that are 4.1-specific (since
1100          * sessions provide their own EOS), and except for stateful
1101          * operations other than setclientid and setclientid_confirm
1102          * (since sequence numbers provide EOS for open, lock, etc in
1103          * the v4.0 case).
1104          */
1105         OP_CACHEME = 1 << 6,
1106         /*
1107          * These are ops which clear current state id.
1108          */
1109         OP_CLEAR_STATEID = 1 << 7,
1110 };
1111
1112 struct nfsd4_operation {
1113         nfsd4op_func op_func;
1114         u32 op_flags;
1115         char *op_name;
1116         /* Try to get response size before operation */
1117         nfsd4op_rsize op_rsize_bop;
1118         stateid_getter op_get_currentstateid;
1119         stateid_setter op_set_currentstateid;
1120 };
1121
1122 static struct nfsd4_operation nfsd4_ops[];
1123
1124 #ifdef NFSD_DEBUG
1125 static const char *nfsd4_op_name(unsigned opnum);
1126 #endif
1127
1128 /*
1129  * Enforce NFSv4.1 COMPOUND ordering rules:
1130  *
1131  * Also note, enforced elsewhere:
1132  *      - SEQUENCE other than as first op results in
1133  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1134  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1135  *        (Enforced in nfsd4_bind_conn_to_session().)
1136  *      - DESTROY_SESSION must be the final operation in a compound, if
1137  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1138  *        (Enforced in nfsd4_destroy_session().)
1139  */
1140 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1141 {
1142         struct nfsd4_op *op = &args->ops[0];
1143
1144         /* These ordering requirements don't apply to NFSv4.0: */
1145         if (args->minorversion == 0)
1146                 return nfs_ok;
1147         /* This is weird, but OK, not our problem: */
1148         if (args->opcnt == 0)
1149                 return nfs_ok;
1150         if (op->status == nfserr_op_illegal)
1151                 return nfs_ok;
1152         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1153                 return nfserr_op_not_in_session;
1154         if (op->opnum == OP_SEQUENCE)
1155                 return nfs_ok;
1156         if (args->opcnt != 1)
1157                 return nfserr_not_only_op;
1158         return nfs_ok;
1159 }
1160
1161 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1162 {
1163         return &nfsd4_ops[op->opnum];
1164 }
1165
1166 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1167 {
1168         return OPDESC(op)->op_flags & OP_CACHEME;
1169 }
1170
1171 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1172 {
1173         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1174         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1175         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1176         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1177         struct nfsd4_operation *thisd;
1178         struct nfsd4_operation *nextd;
1179
1180         thisd = OPDESC(this);
1181         /*
1182          * Most ops check wronsec on our own; only the putfh-like ops
1183          * have special rules.
1184          */
1185         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1186                 return false;
1187         /*
1188          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1189          * put-filehandle operation if we're not going to use the
1190          * result:
1191          */
1192         if (argp->opcnt == resp->opcnt)
1193                 return false;
1194         if (next->opnum == OP_ILLEGAL)
1195                 return false;
1196         nextd = OPDESC(next);
1197         /*
1198          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1199          * errors themselves as necessary; others should check for them
1200          * now:
1201          */
1202         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1203 }
1204
1205 /*
1206  * COMPOUND call.
1207  */
1208 static __be32
1209 nfsd4_proc_compound(struct svc_rqst *rqstp,
1210                     struct nfsd4_compoundargs *args,
1211                     struct nfsd4_compoundres *resp)
1212 {
1213         struct nfsd4_op *op;
1214         struct nfsd4_operation *opdesc;
1215         struct nfsd4_compound_state *cstate = &resp->cstate;
1216         int             slack_bytes;
1217         u32             plen = 0;
1218         __be32          status;
1219
1220         resp->xbuf = &rqstp->rq_res;
1221         resp->p = rqstp->rq_res.head[0].iov_base +
1222                                                 rqstp->rq_res.head[0].iov_len;
1223         resp->tagp = resp->p;
1224         /* reserve space for: taglen, tag, and opcnt */
1225         resp->p += 2 + XDR_QUADLEN(args->taglen);
1226         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1227         resp->taglen = args->taglen;
1228         resp->tag = args->tag;
1229         resp->opcnt = 0;
1230         resp->rqstp = rqstp;
1231         resp->cstate.minorversion = args->minorversion;
1232         resp->cstate.replay_owner = NULL;
1233         resp->cstate.session = NULL;
1234         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1235         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1236         /*
1237          * Don't use the deferral mechanism for NFSv4; compounds make it
1238          * too hard to avoid non-idempotency problems.
1239          */
1240         rqstp->rq_usedeferral = 0;
1241
1242         /*
1243          * According to RFC3010, this takes precedence over all other errors.
1244          */
1245         status = nfserr_minor_vers_mismatch;
1246         if (args->minorversion > nfsd_supported_minorversion)
1247                 goto out;
1248
1249         status = nfs41_check_op_ordering(args);
1250         if (status) {
1251                 op = &args->ops[0];
1252                 op->status = status;
1253                 goto encode_op;
1254         }
1255
1256         while (!status && resp->opcnt < args->opcnt) {
1257                 op = &args->ops[resp->opcnt++];
1258
1259                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1260                         resp->opcnt, args->opcnt, op->opnum,
1261                         nfsd4_op_name(op->opnum));
1262                 /*
1263                  * The XDR decode routines may have pre-set op->status;
1264                  * for example, if there is a miscellaneous XDR error
1265                  * it will be set to nfserr_bad_xdr.
1266                  */
1267                 if (op->status) {
1268                         if (op->opnum == OP_OPEN)
1269                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1270                         goto encode_op;
1271                 }
1272
1273                 /* We must be able to encode a successful response to
1274                  * this operation, with enough room left over to encode a
1275                  * failed response to the next operation.  If we don't
1276                  * have enough room, fail with ERR_RESOURCE.
1277                  */
1278                 slack_bytes = (char *)resp->end - (char *)resp->p;
1279                 if (slack_bytes < COMPOUND_SLACK_SPACE
1280                                 + COMPOUND_ERR_SLACK_SPACE) {
1281                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1282                         op->status = nfserr_resource;
1283                         goto encode_op;
1284                 }
1285
1286                 opdesc = OPDESC(op);
1287
1288                 if (!cstate->current_fh.fh_dentry) {
1289                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1290                                 op->status = nfserr_nofilehandle;
1291                                 goto encode_op;
1292                         }
1293                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1294                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1295                         op->status = nfserr_moved;
1296                         goto encode_op;
1297                 }
1298
1299                 /* If op is non-idempotent */
1300                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1301                         plen = opdesc->op_rsize_bop(rqstp, op);
1302                         /*
1303                          * If there's still another operation, make sure
1304                          * we'll have space to at least encode an error:
1305                          */
1306                         if (resp->opcnt < args->opcnt)
1307                                 plen += COMPOUND_ERR_SLACK_SPACE;
1308                         op->status = nfsd4_check_resp_size(resp, plen);
1309                 }
1310
1311                 if (op->status)
1312                         goto encode_op;
1313
1314                 if (opdesc->op_get_currentstateid)
1315                         opdesc->op_get_currentstateid(cstate, &op->u);
1316                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1317
1318                 if (!op->status) {
1319                         if (opdesc->op_set_currentstateid)
1320                                 opdesc->op_set_currentstateid(cstate, &op->u);
1321
1322                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1323                                 clear_current_stateid(cstate);
1324
1325                         if (need_wrongsec_check(rqstp))
1326                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1327                 }
1328
1329 encode_op:
1330                 /* Only from SEQUENCE */
1331                 if (resp->cstate.status == nfserr_replay_cache) {
1332                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1333                         status = op->status;
1334                         goto out;
1335                 }
1336                 if (op->status == nfserr_replay_me) {
1337                         op->replay = &cstate->replay_owner->so_replay;
1338                         nfsd4_encode_replay(resp, op);
1339                         status = op->status = op->replay->rp_status;
1340                 } else {
1341                         nfsd4_encode_operation(resp, op);
1342                         status = op->status;
1343                 }
1344
1345                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1346                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1347                         be32_to_cpu(status));
1348
1349                 if (cstate->replay_owner) {
1350                         nfs4_unlock_state();
1351                         cstate->replay_owner = NULL;
1352                 }
1353                 /* XXX Ugh, we need to get rid of this kind of special case: */
1354                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1355                         fput(op->u.read.rd_filp);
1356
1357                 nfsd4_increment_op_stats(op->opnum);
1358         }
1359
1360         resp->cstate.status = status;
1361         fh_put(&resp->cstate.current_fh);
1362         fh_put(&resp->cstate.save_fh);
1363         BUG_ON(resp->cstate.replay_owner);
1364 out:
1365         /* Reset deferral mechanism for RPC deferrals */
1366         rqstp->rq_usedeferral = 1;
1367         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1368         return status;
1369 }
1370
1371 #define op_encode_hdr_size              (2)
1372 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1373 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1374 #define op_encode_change_info_maxsz     (5)
1375 #define nfs4_fattr_bitmap_maxsz         (4)
1376
1377 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1378 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1379
1380 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1381
1382 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1383 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1384                                          op_encode_ace_maxsz)
1385
1386 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1387
1388 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1389 {
1390         return (op_encode_hdr_size) * sizeof(__be32);
1391 }
1392
1393 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1394 {
1395         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1396 }
1397
1398 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1399 {
1400         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1401 }
1402
1403 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1404 {
1405         return (op_encode_hdr_size + op_encode_change_info_maxsz
1406                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1407 }
1408
1409 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1410 {
1411         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1412                 * sizeof(__be32);
1413 }
1414
1415 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1416 {
1417         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1418                 * sizeof(__be32);
1419 }
1420
1421 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1422 {
1423         return (op_encode_hdr_size + op_encode_stateid_maxsz
1424                 + op_encode_change_info_maxsz + 1
1425                 + nfs4_fattr_bitmap_maxsz
1426                 + op_encode_delegation_maxsz) * sizeof(__be32);
1427 }
1428
1429 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1430 {
1431         u32 maxcount = 0, rlen = 0;
1432
1433         maxcount = svc_max_payload(rqstp);
1434         rlen = op->u.read.rd_length;
1435
1436         if (rlen > maxcount)
1437                 rlen = maxcount;
1438
1439         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1440 }
1441
1442 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1443 {
1444         u32 rlen = op->u.readdir.rd_maxcount;
1445
1446         if (rlen > PAGE_SIZE)
1447                 rlen = PAGE_SIZE;
1448
1449         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1450                  * sizeof(__be32) + rlen;
1451 }
1452
1453 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1454 {
1455         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1456                 * sizeof(__be32);
1457 }
1458
1459 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1460 {
1461         return (op_encode_hdr_size + op_encode_change_info_maxsz
1462                 + op_encode_change_info_maxsz) * sizeof(__be32);
1463 }
1464
1465 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1466 {
1467         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1468 }
1469
1470 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1471 {
1472         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1473                                                                 sizeof(__be32);
1474 }
1475
1476 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1477 {
1478         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1479 }
1480
1481 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1482 {
1483         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1484                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1485                 2 + /*eir_server_owner.so_minor_id */\
1486                 /* eir_server_owner.so_major_id<> */\
1487                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1488                 /* eir_server_scope<> */\
1489                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1490                 1 + /* eir_server_impl_id array length */\
1491                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1492 }
1493
1494 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1495 {
1496         return (op_encode_hdr_size + \
1497                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1498                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1499 }
1500
1501 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1502 {
1503         return (op_encode_hdr_size + \
1504                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1505                 2 + /* csr_sequence, csr_flags */\
1506                 op_encode_channel_attrs_maxsz + \
1507                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1508 }
1509
1510 static struct nfsd4_operation nfsd4_ops[] = {
1511         [OP_ACCESS] = {
1512                 .op_func = (nfsd4op_func)nfsd4_access,
1513                 .op_name = "OP_ACCESS",
1514         },
1515         [OP_CLOSE] = {
1516                 .op_func = (nfsd4op_func)nfsd4_close,
1517                 .op_flags = OP_MODIFIES_SOMETHING,
1518                 .op_name = "OP_CLOSE",
1519                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1520                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1521                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1522         },
1523         [OP_COMMIT] = {
1524                 .op_func = (nfsd4op_func)nfsd4_commit,
1525                 .op_flags = OP_MODIFIES_SOMETHING,
1526                 .op_name = "OP_COMMIT",
1527                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1528         },
1529         [OP_CREATE] = {
1530                 .op_func = (nfsd4op_func)nfsd4_create,
1531                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1532                 .op_name = "OP_CREATE",
1533                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1534         },
1535         [OP_DELEGRETURN] = {
1536                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1537                 .op_flags = OP_MODIFIES_SOMETHING,
1538                 .op_name = "OP_DELEGRETURN",
1539                 .op_rsize_bop = nfsd4_only_status_rsize,
1540                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1541         },
1542         [OP_GETATTR] = {
1543                 .op_func = (nfsd4op_func)nfsd4_getattr,
1544                 .op_flags = ALLOWED_ON_ABSENT_FS,
1545                 .op_name = "OP_GETATTR",
1546         },
1547         [OP_GETFH] = {
1548                 .op_func = (nfsd4op_func)nfsd4_getfh,
1549                 .op_name = "OP_GETFH",
1550         },
1551         [OP_LINK] = {
1552                 .op_func = (nfsd4op_func)nfsd4_link,
1553                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1554                                 | OP_CACHEME,
1555                 .op_name = "OP_LINK",
1556                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1557         },
1558         [OP_LOCK] = {
1559                 .op_func = (nfsd4op_func)nfsd4_lock,
1560                 .op_flags = OP_MODIFIES_SOMETHING,
1561                 .op_name = "OP_LOCK",
1562                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1563                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1564         },
1565         [OP_LOCKT] = {
1566                 .op_func = (nfsd4op_func)nfsd4_lockt,
1567                 .op_name = "OP_LOCKT",
1568         },
1569         [OP_LOCKU] = {
1570                 .op_func = (nfsd4op_func)nfsd4_locku,
1571                 .op_flags = OP_MODIFIES_SOMETHING,
1572                 .op_name = "OP_LOCKU",
1573                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1574                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1575         },
1576         [OP_LOOKUP] = {
1577                 .op_func = (nfsd4op_func)nfsd4_lookup,
1578                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1579                 .op_name = "OP_LOOKUP",
1580         },
1581         [OP_LOOKUPP] = {
1582                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1583                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1584                 .op_name = "OP_LOOKUPP",
1585         },
1586         [OP_NVERIFY] = {
1587                 .op_func = (nfsd4op_func)nfsd4_nverify,
1588                 .op_name = "OP_NVERIFY",
1589         },
1590         [OP_OPEN] = {
1591                 .op_func = (nfsd4op_func)nfsd4_open,
1592                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1593                 .op_name = "OP_OPEN",
1594                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1595                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1596         },
1597         [OP_OPEN_CONFIRM] = {
1598                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1599                 .op_flags = OP_MODIFIES_SOMETHING,
1600                 .op_name = "OP_OPEN_CONFIRM",
1601                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1602         },
1603         [OP_OPEN_DOWNGRADE] = {
1604                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1605                 .op_flags = OP_MODIFIES_SOMETHING,
1606                 .op_name = "OP_OPEN_DOWNGRADE",
1607                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1608                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1609                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1610         },
1611         [OP_PUTFH] = {
1612                 .op_func = (nfsd4op_func)nfsd4_putfh,
1613                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1614                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1615                                 | OP_CLEAR_STATEID,
1616                 .op_name = "OP_PUTFH",
1617                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1618         },
1619         [OP_PUTPUBFH] = {
1620                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1621                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1622                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1623                                 | OP_CLEAR_STATEID,
1624                 .op_name = "OP_PUTPUBFH",
1625                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1626         },
1627         [OP_PUTROOTFH] = {
1628                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1629                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1630                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1631                                 | OP_CLEAR_STATEID,
1632                 .op_name = "OP_PUTROOTFH",
1633                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1634         },
1635         [OP_READ] = {
1636                 .op_func = (nfsd4op_func)nfsd4_read,
1637                 .op_flags = OP_MODIFIES_SOMETHING,
1638                 .op_name = "OP_READ",
1639                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1640                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1641         },
1642         [OP_READDIR] = {
1643                 .op_func = (nfsd4op_func)nfsd4_readdir,
1644                 .op_flags = OP_MODIFIES_SOMETHING,
1645                 .op_name = "OP_READDIR",
1646                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1647         },
1648         [OP_READLINK] = {
1649                 .op_func = (nfsd4op_func)nfsd4_readlink,
1650                 .op_name = "OP_READLINK",
1651         },
1652         [OP_REMOVE] = {
1653                 .op_func = (nfsd4op_func)nfsd4_remove,
1654                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1655                 .op_name = "OP_REMOVE",
1656                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1657         },
1658         [OP_RENAME] = {
1659                 .op_func = (nfsd4op_func)nfsd4_rename,
1660                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1661                 .op_name = "OP_RENAME",
1662                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1663         },
1664         [OP_RENEW] = {
1665                 .op_func = (nfsd4op_func)nfsd4_renew,
1666                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1667                                 | OP_MODIFIES_SOMETHING,
1668                 .op_name = "OP_RENEW",
1669                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1670
1671         },
1672         [OP_RESTOREFH] = {
1673                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1674                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1675                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1676                 .op_name = "OP_RESTOREFH",
1677                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1678         },
1679         [OP_SAVEFH] = {
1680                 .op_func = (nfsd4op_func)nfsd4_savefh,
1681                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1682                 .op_name = "OP_SAVEFH",
1683                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1684         },
1685         [OP_SECINFO] = {
1686                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1687                 .op_flags = OP_HANDLES_WRONGSEC,
1688                 .op_name = "OP_SECINFO",
1689         },
1690         [OP_SETATTR] = {
1691                 .op_func = (nfsd4op_func)nfsd4_setattr,
1692                 .op_name = "OP_SETATTR",
1693                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1694                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1695                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1696         },
1697         [OP_SETCLIENTID] = {
1698                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1699                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1700                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1701                 .op_name = "OP_SETCLIENTID",
1702                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1703         },
1704         [OP_SETCLIENTID_CONFIRM] = {
1705                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1706                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1707                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1708                 .op_name = "OP_SETCLIENTID_CONFIRM",
1709                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1710         },
1711         [OP_VERIFY] = {
1712                 .op_func = (nfsd4op_func)nfsd4_verify,
1713                 .op_name = "OP_VERIFY",
1714         },
1715         [OP_WRITE] = {
1716                 .op_func = (nfsd4op_func)nfsd4_write,
1717                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1718                 .op_name = "OP_WRITE",
1719                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1720                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1721         },
1722         [OP_RELEASE_LOCKOWNER] = {
1723                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1724                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1725                                 | OP_MODIFIES_SOMETHING,
1726                 .op_name = "OP_RELEASE_LOCKOWNER",
1727                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1728         },
1729
1730         /* NFSv4.1 operations */
1731         [OP_EXCHANGE_ID] = {
1732                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1733                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1734                                 | OP_MODIFIES_SOMETHING,
1735                 .op_name = "OP_EXCHANGE_ID",
1736                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1737         },
1738         [OP_BACKCHANNEL_CTL] = {
1739                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1740                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1741                 .op_name = "OP_BACKCHANNEL_CTL",
1742                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1743         },
1744         [OP_BIND_CONN_TO_SESSION] = {
1745                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1746                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1747                                 | OP_MODIFIES_SOMETHING,
1748                 .op_name = "OP_BIND_CONN_TO_SESSION",
1749                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1750         },
1751         [OP_CREATE_SESSION] = {
1752                 .op_func = (nfsd4op_func)nfsd4_create_session,
1753                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1754                                 | OP_MODIFIES_SOMETHING,
1755                 .op_name = "OP_CREATE_SESSION",
1756                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1757         },
1758         [OP_DESTROY_SESSION] = {
1759                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1760                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1761                                 | OP_MODIFIES_SOMETHING,
1762                 .op_name = "OP_DESTROY_SESSION",
1763                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1764         },
1765         [OP_SEQUENCE] = {
1766                 .op_func = (nfsd4op_func)nfsd4_sequence,
1767                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1768                 .op_name = "OP_SEQUENCE",
1769         },
1770         [OP_DESTROY_CLIENTID] = {
1771                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1772                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1773                                 | OP_MODIFIES_SOMETHING,
1774                 .op_name = "OP_DESTROY_CLIENTID",
1775                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1776         },
1777         [OP_RECLAIM_COMPLETE] = {
1778                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1779                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1780                 .op_name = "OP_RECLAIM_COMPLETE",
1781                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1782         },
1783         [OP_SECINFO_NO_NAME] = {
1784                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1785                 .op_flags = OP_HANDLES_WRONGSEC,
1786                 .op_name = "OP_SECINFO_NO_NAME",
1787         },
1788         [OP_TEST_STATEID] = {
1789                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1790                 .op_flags = ALLOWED_WITHOUT_FH,
1791                 .op_name = "OP_TEST_STATEID",
1792         },
1793         [OP_FREE_STATEID] = {
1794                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1795                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1796                 .op_name = "OP_FREE_STATEID",
1797                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1798                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1799         },
1800 };
1801
1802 #ifdef NFSD_DEBUG
1803 static const char *nfsd4_op_name(unsigned opnum)
1804 {
1805         if (opnum < ARRAY_SIZE(nfsd4_ops))
1806                 return nfsd4_ops[opnum].op_name;
1807         return "unknown_operation";
1808 }
1809 #endif
1810
1811 #define nfsd4_voidres                   nfsd4_voidargs
1812 struct nfsd4_voidargs { int dummy; };
1813
1814 static struct svc_procedure             nfsd_procedures4[2] = {
1815         [NFSPROC4_NULL] = {
1816                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1817                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1818                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1819                 .pc_ressize = sizeof(struct nfsd4_voidres),
1820                 .pc_cachetype = RC_NOCACHE,
1821                 .pc_xdrressize = 1,
1822         },
1823         [NFSPROC4_COMPOUND] = {
1824                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1825                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1826                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1827                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1828                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1829                 .pc_release = nfsd4_release_compoundargs,
1830                 .pc_cachetype = RC_NOCACHE,
1831                 .pc_xdrressize = NFSD_BUFSIZE/4,
1832         },
1833 };
1834
1835 struct svc_version      nfsd_version4 = {
1836                 .vs_vers        = 4,
1837                 .vs_nproc       = 2,
1838                 .vs_proc        = nfsd_procedures4,
1839                 .vs_dispatch    = nfsd_dispatch,
1840                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1841 };
1842
1843 /*
1844  * Local variables:
1845  *  c-basic-offset: 8
1846  * End:
1847  */