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