fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42 #include "current_stateid.h"
  43 #include "netns.h"
  44
  45 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  46
  47 static u32 nfsd_attrmask[] = {
  48         NFSD_WRITEABLE_ATTRS_WORD0,
  49         NFSD_WRITEABLE_ATTRS_WORD1,
  50         NFSD_WRITEABLE_ATTRS_WORD2
  51 };
  52
  53 static u32 nfsd41_ex_attrmask[] = {
  54         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  55         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  56         NFSD_SUPPATTR_EXCLCREAT_WORD2
  57 };
  58
  59 static __be32
  60 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  61                    u32 *bmval, u32 *writable)
  62 {
  63         struct dentry *dentry = cstate->current_fh.fh_dentry;
  64
  65         /*
  66          * Check about attributes are supported by the NFSv4 server or not.
  67          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  68          */
  69         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  70             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  71             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  72                 return nfserr_attrnotsupp;
  73
  74         /*
  75          * Check FATTR4_WORD0_ACL can be supported
  76          * in current environment or not.
  77          */
  78         if (bmval[0] & FATTR4_WORD0_ACL) {
  79                 if (!IS_POSIXACL(dentry->d_inode))
  80                         return nfserr_attrnotsupp;
  81         }
  82
  83         /*
  84          * According to spec, read-only attributes return ERR_INVAL.
  85          */
  86         if (writable) {
  87                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  88                     (bmval[2] & ~writable[2]))
  89                         return nfserr_inval;
  90         }
  91
  92         return nfs_ok;
  93 }
  94
  95 static __be32
  96 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  97         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  98 {
  99         __be32 status = nfs_ok;
 100
 101         if (open->op_create == NFS4_OPEN_CREATE) {
 102                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 103                     || open->op_createmode == NFS4_CREATE_GUARDED)
 104                         status = check_attr_support(rqstp, cstate,
 105                                         open->op_bmval, nfsd_attrmask);
 106                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 107                         status = check_attr_support(rqstp, cstate,
 108                                         open->op_bmval, nfsd41_ex_attrmask);
 109         }
 110
 111         return status;
 112 }
 113
 114 static int
 115 is_create_with_attrs(struct nfsd4_open *open)
 116 {
 117         return open->op_create == NFS4_OPEN_CREATE
 118                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 119                     || open->op_createmode == NFS4_CREATE_GUARDED
 120                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 121 }
 122
 123 /*
 124  * if error occurs when setting the acl, just clear the acl bit
 125  * in the returned attr bitmap.
 126  */
 127 static void
 128 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 129                 struct nfs4_acl *acl, u32 *bmval)
 130 {
 131         __be32 status;
 132
 133         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 134         if (status)
 135                 /*
 136                  * We should probably fail the whole open at this point,
 137                  * but we've already created the file, so it's too late;
 138                  * So this seems the least of evils:
 139                  */
 140                 bmval[0] &= ~FATTR4_WORD0_ACL;
 141 }
 142
 143 static inline void
 144 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 145 {
 146         fh_put(dst);
 147         dget(src->fh_dentry);
 148         if (src->fh_export)
 149                 cache_get(&src->fh_export->h);
 150         *dst = *src;
 151 }
 152
 153 static __be32
 154 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 155 {
 156         __be32 status;
 157
 158         if (open->op_truncate &&
 159                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 160                 return nfserr_inval;
 161
 162         accmode |= NFSD_MAY_READ_IF_EXEC;
 163
 164         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 165                 accmode |= NFSD_MAY_READ;
 166         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 167                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 168         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 169                 accmode |= NFSD_MAY_WRITE;
 170
 171         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 172
 173         return status;
 174 }
 175
 176 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 177 {
 178         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 179
 180         if (S_ISREG(mode))
 181                 return nfs_ok;
 182         if (S_ISDIR(mode))
 183                 return nfserr_isdir;
 184         /*
 185          * Using err_symlink as our catch-all case may look odd; but
 186          * there's no other obvious error for this case in 4.0, and we
 187          * happen to know that it will cause the linux v4 client to do
 188          * the right thing on attempts to open something other than a
 189          * regular file.
 190          */
 191         return nfserr_symlink;
 192 }
 193
 194 static __be32
 195 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 196 {
 197         struct svc_fh *resfh;
 198         __be32 status;
 199
 200         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 201         if (!resfh)
 202                 return nfserr_jukebox;
 203         fh_init(resfh, NFS4_FHSIZE);
 204         open->op_truncate = 0;
 205
 206         if (open->op_create) {
 207                 /* FIXME: check session persistence and pnfs flags.
 208                  * The nfsv4.1 spec requires the following semantics:
 209                  *
 210                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 211                  * Reply Cache  | server |                 |
 212                  * -------------+--------+-----------------+--------------------
 213                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 214                  *              |        |                 | (SHOULD)
 215                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 216                  *              |        |                 | (SHOULD NOT)
 217                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 218                  * yes          | no     | GUARDED4        | GUARDED4
 219                  * yes          | yes    | GUARDED4        | GUARDED4
 220                  */
 221
 222                 /*
 223                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 224                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 225                  */
 226                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 227                                         open->op_fname.len, &open->op_iattr,
 228                                         resfh, open->op_createmode,
 229                                         (u32 *)open->op_verf.data,
 230                                         &open->op_truncate, &open->op_created);
 231
 232                 /*
 233                  * Following rfc 3530 14.2.16, use the returned bitmask
 234                  * to indicate which attributes we used to store the
 235                  * verifier:
 236                  */
 237                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 238                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 239                                                         FATTR4_WORD1_TIME_MODIFY);
 240         } else {
 241                 status = nfsd_lookup(rqstp, current_fh,
 242                                      open->op_fname.data, open->op_fname.len, resfh);
 243                 fh_unlock(current_fh);
 244         }
 245         if (status)
 246                 goto out;
 247         status = nfsd_check_obj_isreg(resfh);
 248         if (status)
 249                 goto out;
 250
 251         if (is_create_with_attrs(open) && open->op_acl != NULL)
 252                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 253
 254         /* set reply cache */
 255         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 256                         &resfh->fh_handle);
 257         if (!open->op_created)
 258                 status = do_open_permission(rqstp, resfh, open,
 259                                             NFSD_MAY_NOP);
 260         set_change_info(&open->op_cinfo, current_fh);
 261         fh_dup2(current_fh, resfh);
 262 out:
 263         fh_put(resfh);
 264         kfree(resfh);
 265         return status;
 266 }
 267
 268 static __be32
 269 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 270 {
 271         __be32 status;
 272
 273         /* We don't know the target directory, and therefore can not
 274         * set the change info
 275         */
 276
 277         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 278
 279         /* set replay cache */
 280         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 281                         &current_fh->fh_handle);
 282
 283         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 284                 (open->op_iattr.ia_size == 0);
 285
 286         status = do_open_permission(rqstp, current_fh, open,
 287                                     NFSD_MAY_OWNER_OVERRIDE);
 288
 289         return status;
 290 }
 291
 292 static void
 293 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 294 {
 295         struct nfsd4_sessionid *sid =
 296                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 297
 298         clid->cl_boot = sid->clientid.cl_boot;
 299         clid->cl_id = sid->clientid.cl_id;
 300 }
 301
 302 static __be32
 303 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 304            struct nfsd4_open *open)
 305 {
 306         __be32 status;
 307         struct nfsd4_compoundres *resp;
 308         struct net *net = SVC_NET(rqstp);
 309         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 310
 311         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 312                 (int)open->op_fname.len, open->op_fname.data,
 313                 open->op_openowner);
 314
 315         /* This check required by spec. */
 316         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 317                 return nfserr_inval;
 318
 319         open->op_created = 0;
 320         /*
 321          * RFC5661 18.51.3
 322          * Before RECLAIM_COMPLETE done, server should deny new lock
 323          */
 324         if (nfsd4_has_session(cstate) &&
 325             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 326                       &cstate->session->se_client->cl_flags) &&
 327             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 328                 return nfserr_grace;
 329
 330         if (nfsd4_has_session(cstate))
 331                 copy_clientid(&open->op_clientid, cstate->session);
 332
 333         nfs4_lock_state();
 334
 335         /* check seqid for replay. set nfs4_owner */
 336         resp = rqstp->rq_resp;
 337         status = nfsd4_process_open1(&resp->cstate, open, nn);
 338         if (status == nfserr_replay_me) {
 339                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 340                 fh_put(&cstate->current_fh);
 341                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 342                                 &rp->rp_openfh);
 343                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 344                 if (status)
 345                         dprintk("nfsd4_open: replay failed"
 346                                 " restoring previous filehandle\n");
 347                 else
 348                         status = nfserr_replay_me;
 349         }
 350         if (status)
 351                 goto out;
 352
 353         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 354         if (status)
 355                 goto out;
 356
 357         /* Openowner is now set, so sequence id will get bumped.  Now we need
 358          * these checks before we do any creates: */
 359         status = nfserr_grace;
 360         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 361                 goto out;
 362         status = nfserr_no_grace;
 363         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 364                 goto out;
 365
 366         switch (open->op_claim_type) {
 367                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 368                 case NFS4_OPEN_CLAIM_NULL:
 369                         status = do_open_lookup(rqstp, &cstate->current_fh,
 370                                                 open);
 371                         if (status)
 372                                 goto out;
 373                         break;
 374                 case NFS4_OPEN_CLAIM_PREVIOUS:
 375                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 376                         status = nfs4_check_open_reclaim(&open->op_clientid,
 377                                                          cstate->minorversion,
 378                                                          nn);
 379                         if (status)
 380                                 goto out;
 381                 case NFS4_OPEN_CLAIM_FH:
 382                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 383                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 384                                                  open);
 385                         if (status)
 386                                 goto out;
 387                         break;
 388                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 389                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 390                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 391                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 392                                 open->op_claim_type);
 393                         status = nfserr_notsupp;
 394                         goto out;
 395                 default:
 396                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 397                                 open->op_claim_type);
 398                         status = nfserr_inval;
 399                         goto out;
 400         }
 401         /*
 402          * nfsd4_process_open2() does the actual opening of the file.  If
 403          * successful, it (1) truncates the file if open->op_truncate was
 404          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 405          */
 406         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 407         WARN_ON(status && open->op_created);
 408 out:
 409         nfsd4_cleanup_open_state(open, status);
 410         if (open->op_openowner)
 411                 cstate->replay_owner = &open->op_openowner->oo_owner;
 412         else
 413                 nfs4_unlock_state();
 414         return status;
 415 }
 416
 417 /*
 418  * filehandle-manipulating ops.
 419  */
 420 static __be32
 421 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 422             struct svc_fh **getfh)
 423 {
 424         if (!cstate->current_fh.fh_dentry)
 425                 return nfserr_nofilehandle;
 426
 427         *getfh = &cstate->current_fh;
 428         return nfs_ok;
 429 }
 430
 431 static __be32
 432 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 433             struct nfsd4_putfh *putfh)
 434 {
 435         fh_put(&cstate->current_fh);
 436         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 437         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 438                putfh->pf_fhlen);
 439         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 440 }
 441
 442 static __be32
 443 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 444                 void *arg)
 445 {
 446         __be32 status;
 447
 448         fh_put(&cstate->current_fh);
 449         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 450         return status;
 451 }
 452
 453 static __be32
 454 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 455                 void *arg)
 456 {
 457         if (!cstate->save_fh.fh_dentry)
 458                 return nfserr_restorefh;
 459
 460         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 461         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 462                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 463                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 464         }
 465         return nfs_ok;
 466 }
 467
 468 static __be32
 469 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 470              void *arg)
 471 {
 472         if (!cstate->current_fh.fh_dentry)
 473                 return nfserr_nofilehandle;
 474
 475         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 476         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 477                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 478                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 479         }
 480         return nfs_ok;
 481 }
 482
 483 /*
 484  * misc nfsv4 ops
 485  */
 486 static __be32
 487 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 488              struct nfsd4_access *access)
 489 {
 490         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 491                 return nfserr_inval;
 492
 493         access->ac_resp_access = access->ac_req_access;
 494         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 495                            &access->ac_supported);
 496 }
 497
 498 static void gen_boot_verifier(nfs4_verifier *verifier)
 499 {
 500         __be32 verf[2];
 501
 502         verf[0] = (__be32)nfssvc_boot.tv_sec;
 503         verf[1] = (__be32)nfssvc_boot.tv_usec;
 504         memcpy(verifier->data, verf, sizeof(verifier->data));
 505 }
 506
 507 static __be32
 508 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 509              struct nfsd4_commit *commit)
 510 {
 511         gen_boot_verifier(&commit->co_verf);
 512         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 513                              commit->co_count);
 514 }
 515
 516 static __be32
 517 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 518              struct nfsd4_create *create)
 519 {
 520         struct svc_fh resfh;
 521         __be32 status;
 522         dev_t rdev;
 523
 524         fh_init(&resfh, NFS4_FHSIZE);
 525
 526         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 527                            NFSD_MAY_CREATE);
 528         if (status)
 529                 return status;
 530
 531         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 532                                     nfsd_attrmask);
 533         if (status)
 534                 return status;
 535
 536         switch (create->cr_type) {
 537         case NF4LNK:
 538                 /* ugh! we have to null-terminate the linktext, or
 539                  * vfs_symlink() will choke.  it is always safe to
 540                  * null-terminate by brute force, since at worst we
 541                  * will overwrite the first byte of the create namelen
 542                  * in the XDR buffer, which has already been extracted
 543                  * during XDR decode.
 544                  */
 545                 create->cr_linkname[create->cr_linklen] = 0;
 546
 547                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 548                                       create->cr_name, create->cr_namelen,
 549                                       create->cr_linkname, create->cr_linklen,
 550                                       &resfh, &create->cr_iattr);
 551                 break;
 552
 553         case NF4BLK:
 554                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 555                 if (MAJOR(rdev) != create->cr_specdata1 ||
 556                     MINOR(rdev) != create->cr_specdata2)
 557                         return nfserr_inval;
 558                 status = nfsd_create(rqstp, &cstate->current_fh,
 559                                      create->cr_name, create->cr_namelen,
 560                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 561                 break;
 562
 563         case NF4CHR:
 564                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 565                 if (MAJOR(rdev) != create->cr_specdata1 ||
 566                     MINOR(rdev) != create->cr_specdata2)
 567                         return nfserr_inval;
 568                 status = nfsd_create(rqstp, &cstate->current_fh,
 569                                      create->cr_name, create->cr_namelen,
 570                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 571                 break;
 572
 573         case NF4SOCK:
 574                 status = nfsd_create(rqstp, &cstate->current_fh,
 575                                      create->cr_name, create->cr_namelen,
 576                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 577                 break;
 578
 579         case NF4FIFO:
 580                 status = nfsd_create(rqstp, &cstate->current_fh,
 581                                      create->cr_name, create->cr_namelen,
 582                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 583                 break;
 584
 585         case NF4DIR:
 586                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 587                 status = nfsd_create(rqstp, &cstate->current_fh,
 588                                      create->cr_name, create->cr_namelen,
 589                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 590                 break;
 591
 592         default:
 593                 status = nfserr_badtype;
 594         }
 595
 596         if (status)
 597                 goto out;
 598
 599         if (create->cr_acl != NULL)
 600                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 601                                 create->cr_bmval);
 602
 603         fh_unlock(&cstate->current_fh);
 604         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 605         fh_dup2(&cstate->current_fh, &resfh);
 606 out:
 607         fh_put(&resfh);
 608         return status;
 609 }
 610
 611 static __be32
 612 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 613               struct nfsd4_getattr *getattr)
 614 {
 615         __be32 status;
 616
 617         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 618         if (status)
 619                 return status;
 620
 621         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 622                 return nfserr_inval;
 623
 624         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 625         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 626         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 627
 628         getattr->ga_fhp = &cstate->current_fh;
 629         return nfs_ok;
 630 }
 631
 632 static __be32
 633 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 634            struct nfsd4_link *link)
 635 {
 636         __be32 status = nfserr_nofilehandle;
 637
 638         if (!cstate->save_fh.fh_dentry)
 639                 return status;
 640         status = nfsd_link(rqstp, &cstate->current_fh,
 641                            link->li_name, link->li_namelen, &cstate->save_fh);
 642         if (!status)
 643                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 644         return status;
 645 }
 646
 647 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 648 {
 649         struct svc_fh tmp_fh;
 650         __be32 ret;
 651
 652         fh_init(&tmp_fh, NFS4_FHSIZE);
 653         ret = exp_pseudoroot(rqstp, &tmp_fh);
 654         if (ret)
 655                 return ret;
 656         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 657                 fh_put(&tmp_fh);
 658                 return nfserr_noent;
 659         }
 660         fh_put(&tmp_fh);
 661         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 662 }
 663
 664 static __be32
 665 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 666               void *arg)
 667 {
 668         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 669 }
 670
 671 static __be32
 672 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 673              struct nfsd4_lookup *lookup)
 674 {
 675         return nfsd_lookup(rqstp, &cstate->current_fh,
 676                            lookup->lo_name, lookup->lo_len,
 677                            &cstate->current_fh);
 678 }
 679
 680 static __be32
 681 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 682            struct nfsd4_read *read)
 683 {
 684         __be32 status;
 685
 686         /* no need to check permission - this will be done in nfsd_read() */
 687
 688         read->rd_filp = NULL;
 689         if (read->rd_offset >= OFFSET_MAX)
 690                 return nfserr_inval;
 691
 692         nfs4_lock_state();
 693         /* check stateid */
 694         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 695                                                  cstate, &read->rd_stateid,
 696                                                  RD_STATE, &read->rd_filp))) {
 697                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 698                 goto out;
 699         }
 700         if (read->rd_filp)
 701                 get_file(read->rd_filp);
 702         status = nfs_ok;
 703 out:
 704         nfs4_unlock_state();
 705         read->rd_rqstp = rqstp;
 706         read->rd_fhp = &cstate->current_fh;
 707         return status;
 708 }
 709
 710 static __be32
 711 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 712               struct nfsd4_readdir *readdir)
 713 {
 714         u64 cookie = readdir->rd_cookie;
 715         static const nfs4_verifier zeroverf;
 716
 717         /* no need to check permission - this will be done in nfsd_readdir() */
 718
 719         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 720                 return nfserr_inval;
 721
 722         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 723         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 724         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 725
 726         if ((cookie == 1) || (cookie == 2) ||
 727             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 728                 return nfserr_bad_cookie;
 729
 730         readdir->rd_rqstp = rqstp;
 731         readdir->rd_fhp = &cstate->current_fh;
 732         return nfs_ok;
 733 }
 734
 735 static __be32
 736 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 737                struct nfsd4_readlink *readlink)
 738 {
 739         readlink->rl_rqstp = rqstp;
 740         readlink->rl_fhp = &cstate->current_fh;
 741         return nfs_ok;
 742 }
 743
 744 static __be32
 745 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 746              struct nfsd4_remove *remove)
 747 {
 748         __be32 status;
 749
 750         if (locks_in_grace(SVC_NET(rqstp)))
 751                 return nfserr_grace;
 752         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 753                              remove->rm_name, remove->rm_namelen);
 754         if (!status) {
 755                 fh_unlock(&cstate->current_fh);
 756                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 757         }
 758         return status;
 759 }
 760
 761 static __be32
 762 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 763              struct nfsd4_rename *rename)
 764 {
 765         __be32 status = nfserr_nofilehandle;
 766
 767         if (!cstate->save_fh.fh_dentry)
 768                 return status;
 769         if (locks_in_grace(SVC_NET(rqstp)) &&
 770                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 771                 return nfserr_grace;
 772         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 773                              rename->rn_snamelen, &cstate->current_fh,
 774                              rename->rn_tname, rename->rn_tnamelen);
 775
 776         /* the underlying filesystem returns different error's than required
 777          * by NFSv4. both save_fh and current_fh have been verified.. */
 778         if (status == nfserr_isdir)
 779                 status = nfserr_exist;
 780         else if ((status == nfserr_notdir) &&
 781                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 782                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 783                 status = nfserr_exist;
 784
 785         if (!status) {
 786                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 787                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 788         }
 789         return status;
 790 }
 791
 792 static __be32
 793 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 794               struct nfsd4_secinfo *secinfo)
 795 {
 796         struct svc_fh resfh;
 797         struct svc_export *exp;
 798         struct dentry *dentry;
 799         __be32 err;
 800
 801         fh_init(&resfh, NFS4_FHSIZE);
 802         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 803         if (err)
 804                 return err;
 805         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 806                                     secinfo->si_name, secinfo->si_namelen,
 807                                     &exp, &dentry);
 808         if (err)
 809                 return err;
 810         if (dentry->d_inode == NULL) {
 811                 exp_put(exp);
 812                 err = nfserr_noent;
 813         } else
 814                 secinfo->si_exp = exp;
 815         dput(dentry);
 816         if (cstate->minorversion)
 817                 /* See rfc 5661 section 2.6.3.1.1.8 */
 818                 fh_put(&cstate->current_fh);
 819         return err;
 820 }
 821
 822 static __be32
 823 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 824               struct nfsd4_secinfo_no_name *sin)
 825 {
 826         __be32 err;
 827
 828         switch (sin->sin_style) {
 829         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 830                 break;
 831         case NFS4_SECINFO_STYLE4_PARENT:
 832                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 833                 if (err)
 834                         return err;
 835                 break;
 836         default:
 837                 return nfserr_inval;
 838         }
 839         exp_get(cstate->current_fh.fh_export);
 840         sin->sin_exp = cstate->current_fh.fh_export;
 841         fh_put(&cstate->current_fh);
 842         return nfs_ok;
 843 }
 844
 845 static __be32
 846 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 847               struct nfsd4_setattr *setattr)
 848 {
 849         __be32 status = nfs_ok;
 850         int err;
 851
 852         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 853                 nfs4_lock_state();
 854                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 855                         &setattr->sa_stateid, WR_STATE, NULL);
 856                 nfs4_unlock_state();
 857                 if (status) {
 858                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 859                         return status;
 860                 }
 861         }
 862         err = fh_want_write(&cstate->current_fh);
 863         if (err)
 864                 return nfserrno(err);
 865         status = nfs_ok;
 866
 867         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 868                                     nfsd_attrmask);
 869         if (status)
 870                 goto out;
 871
 872         if (setattr->sa_acl != NULL)
 873                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 874                                             setattr->sa_acl);
 875         if (status)
 876                 goto out;
 877         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 878                                 0, (time_t)0);
 879 out:
 880         fh_drop_write(&cstate->current_fh);
 881         return status;
 882 }
 883
 884 static __be32
 885 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 886             struct nfsd4_write *write)
 887 {
 888         stateid_t *stateid = &write->wr_stateid;
 889         struct file *filp = NULL;
 890         __be32 status = nfs_ok;
 891         unsigned long cnt;
 892
 893         /* no need to check permission - this will be done in nfsd_write() */
 894
 895         if (write->wr_offset >= OFFSET_MAX)
 896                 return nfserr_inval;
 897
 898         nfs4_lock_state();
 899         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 900                                         cstate, stateid, WR_STATE, &filp);
 901         if (filp)
 902                 get_file(filp);
 903         nfs4_unlock_state();
 904
 905         if (status) {
 906                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 907                 return status;
 908         }
 909
 910         cnt = write->wr_buflen;
 911         write->wr_how_written = write->wr_stable_how;
 912         gen_boot_verifier(&write->wr_verifier);
 913
 914         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 915                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 916                              &cnt, &write->wr_how_written);
 917         if (filp)
 918                 fput(filp);
 919
 920         write->wr_bytes_written = cnt;
 921
 922         return status;
 923 }
 924
 925 /* This routine never returns NFS_OK!  If there are no other errors, it
 926  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 927  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 928  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 929  */
 930 static __be32
 931 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 932              struct nfsd4_verify *verify)
 933 {
 934         __be32 *buf, *p;
 935         int count;
 936         __be32 status;
 937
 938         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 939         if (status)
 940                 return status;
 941
 942         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 943         if (status)
 944                 return status;
 945
 946         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 947             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 948                 return nfserr_inval;
 949         if (verify->ve_attrlen & 3)
 950                 return nfserr_inval;
 951
 952         /* count in words:
 953          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 954          */
 955         count = 4 + (verify->ve_attrlen >> 2);
 956         buf = kmalloc(count << 2, GFP_KERNEL);
 957         if (!buf)
 958                 return nfserr_jukebox;
 959
 960         status = nfsd4_encode_fattr(&cstate->current_fh,
 961                                     cstate->current_fh.fh_export,
 962                                     cstate->current_fh.fh_dentry, buf,
 963                                     &count, verify->ve_bmval,
 964                                     rqstp, 0);
 965
 966         /* this means that nfsd4_encode_fattr() ran out of space */
 967         if (status == nfserr_resource && count == 0)
 968                 status = nfserr_not_same;
 969         if (status)
 970                 goto out_kfree;
 971
 972         /* skip bitmap */
 973         p = buf + 1 + ntohl(buf[0]);
 974         status = nfserr_not_same;
 975         if (ntohl(*p++) != verify->ve_attrlen)
 976                 goto out_kfree;
 977         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 978                 status = nfserr_same;
 979
 980 out_kfree:
 981         kfree(buf);
 982         return status;
 983 }
 984
 985 static __be32
 986 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 987               struct nfsd4_verify *verify)
 988 {
 989         __be32 status;
 990
 991         status = _nfsd4_verify(rqstp, cstate, verify);
 992         return status == nfserr_not_same ? nfs_ok : status;
 993 }
 994
 995 static __be32
 996 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 997              struct nfsd4_verify *verify)
 998 {
 999         __be32 status;
1000
1001         status = _nfsd4_verify(rqstp, cstate, verify);
1002         return status == nfserr_same ? nfs_ok : status;
1003 }
1004
1005 /*
1006  * NULL call.
1007  */
1008 static __be32
1009 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1010 {
1011         return nfs_ok;
1012 }
1013
1014 static inline void nfsd4_increment_op_stats(u32 opnum)
1015 {
1016         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1017                 nfsdstats.nfs4_opcount[opnum]++;
1018 }
1019
1020 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1021                               void *);
1022 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1023 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1024 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1025
1026 enum nfsd4_op_flags {
1027         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1028         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1029         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1030         /* For rfc 5661 section 2.6.3.1.1: */
1031         OP_HANDLES_WRONGSEC = 1 << 3,
1032         OP_IS_PUTFH_LIKE = 1 << 4,
1033         /*
1034          * These are the ops whose result size we estimate before
1035          * encoding, to avoid performing an op then not being able to
1036          * respond or cache a response.  This includes writes and setattrs
1037          * as well as the operations usually called "nonidempotent":
1038          */
1039         OP_MODIFIES_SOMETHING = 1 << 5,
1040         /*
1041          * Cache compounds containing these ops in the xid-based drc:
1042          * We use the DRC for compounds containing non-idempotent
1043          * operations, *except* those that are 4.1-specific (since
1044          * sessions provide their own EOS), and except for stateful
1045          * operations other than setclientid and setclientid_confirm
1046          * (since sequence numbers provide EOS for open, lock, etc in
1047          * the v4.0 case).
1048          */
1049         OP_CACHEME = 1 << 6,
1050         /*
1051          * These are ops which clear current state id.
1052          */
1053         OP_CLEAR_STATEID = 1 << 7,
1054 };
1055
1056 struct nfsd4_operation {
1057         nfsd4op_func op_func;
1058         u32 op_flags;
1059         char *op_name;
1060         /* Try to get response size before operation */
1061         nfsd4op_rsize op_rsize_bop;
1062         stateid_getter op_get_currentstateid;
1063         stateid_setter op_set_currentstateid;
1064 };
1065
1066 static struct nfsd4_operation nfsd4_ops[];
1067
1068 #ifdef NFSD_DEBUG
1069 static const char *nfsd4_op_name(unsigned opnum);
1070 #endif
1071
1072 /*
1073  * Enforce NFSv4.1 COMPOUND ordering rules:
1074  *
1075  * Also note, enforced elsewhere:
1076  *      - SEQUENCE other than as first op results in
1077  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1078  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1079  *        (Enforced in nfsd4_bind_conn_to_session().)
1080  *      - DESTROY_SESSION must be the final operation in a compound, if
1081  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1082  *        (Enforced in nfsd4_destroy_session().)
1083  */
1084 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1085 {
1086         struct nfsd4_op *op = &args->ops[0];
1087
1088         /* These ordering requirements don't apply to NFSv4.0: */
1089         if (args->minorversion == 0)
1090                 return nfs_ok;
1091         /* This is weird, but OK, not our problem: */
1092         if (args->opcnt == 0)
1093                 return nfs_ok;
1094         if (op->status == nfserr_op_illegal)
1095                 return nfs_ok;
1096         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1097                 return nfserr_op_not_in_session;
1098         if (op->opnum == OP_SEQUENCE)
1099                 return nfs_ok;
1100         if (args->opcnt != 1)
1101                 return nfserr_not_only_op;
1102         return nfs_ok;
1103 }
1104
1105 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1106 {
1107         return &nfsd4_ops[op->opnum];
1108 }
1109
1110 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1111 {
1112         return OPDESC(op)->op_flags & OP_CACHEME;
1113 }
1114
1115 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1116 {
1117         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1118         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1119         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1120         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1121         struct nfsd4_operation *thisd;
1122         struct nfsd4_operation *nextd;
1123
1124         thisd = OPDESC(this);
1125         /*
1126          * Most ops check wronsec on our own; only the putfh-like ops
1127          * have special rules.
1128          */
1129         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1130                 return false;
1131         /*
1132          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1133          * put-filehandle operation if we're not going to use the
1134          * result:
1135          */
1136         if (argp->opcnt == resp->opcnt)
1137                 return false;
1138
1139         nextd = OPDESC(next);
1140         /*
1141          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1142          * errors themselves as necessary; others should check for them
1143          * now:
1144          */
1145         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1146 }
1147
1148 /*
1149  * COMPOUND call.
1150  */
1151 static __be32
1152 nfsd4_proc_compound(struct svc_rqst *rqstp,
1153                     struct nfsd4_compoundargs *args,
1154                     struct nfsd4_compoundres *resp)
1155 {
1156         struct nfsd4_op *op;
1157         struct nfsd4_operation *opdesc;
1158         struct nfsd4_compound_state *cstate = &resp->cstate;
1159         int             slack_bytes;
1160         u32             plen = 0;
1161         __be32          status;
1162
1163         resp->xbuf = &rqstp->rq_res;
1164         resp->p = rqstp->rq_res.head[0].iov_base +
1165                                                 rqstp->rq_res.head[0].iov_len;
1166         resp->tagp = resp->p;
1167         /* reserve space for: taglen, tag, and opcnt */
1168         resp->p += 2 + XDR_QUADLEN(args->taglen);
1169         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1170         resp->taglen = args->taglen;
1171         resp->tag = args->tag;
1172         resp->opcnt = 0;
1173         resp->rqstp = rqstp;
1174         resp->cstate.minorversion = args->minorversion;
1175         resp->cstate.replay_owner = NULL;
1176         resp->cstate.session = NULL;
1177         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1178         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1179         /*
1180          * Don't use the deferral mechanism for NFSv4; compounds make it
1181          * too hard to avoid non-idempotency problems.
1182          */
1183         rqstp->rq_usedeferral = 0;
1184
1185         /*
1186          * According to RFC3010, this takes precedence over all other errors.
1187          */
1188         status = nfserr_minor_vers_mismatch;
1189         if (args->minorversion > nfsd_supported_minorversion)
1190                 goto out;
1191
1192         status = nfs41_check_op_ordering(args);
1193         if (status) {
1194                 op = &args->ops[0];
1195                 op->status = status;
1196                 goto encode_op;
1197         }
1198
1199         while (!status && resp->opcnt < args->opcnt) {
1200                 op = &args->ops[resp->opcnt++];
1201
1202                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1203                         resp->opcnt, args->opcnt, op->opnum,
1204                         nfsd4_op_name(op->opnum));
1205                 /*
1206                  * The XDR decode routines may have pre-set op->status;
1207                  * for example, if there is a miscellaneous XDR error
1208                  * it will be set to nfserr_bad_xdr.
1209                  */
1210                 if (op->status)
1211                         goto encode_op;
1212
1213                 /* We must be able to encode a successful response to
1214                  * this operation, with enough room left over to encode a
1215                  * failed response to the next operation.  If we don't
1216                  * have enough room, fail with ERR_RESOURCE.
1217                  */
1218                 slack_bytes = (char *)resp->end - (char *)resp->p;
1219                 if (slack_bytes < COMPOUND_SLACK_SPACE
1220                                 + COMPOUND_ERR_SLACK_SPACE) {
1221                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1222                         op->status = nfserr_resource;
1223                         goto encode_op;
1224                 }
1225
1226                 opdesc = OPDESC(op);
1227
1228                 if (!cstate->current_fh.fh_dentry) {
1229                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1230                                 op->status = nfserr_nofilehandle;
1231                                 goto encode_op;
1232                         }
1233                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1234                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1235                         op->status = nfserr_moved;
1236                         goto encode_op;
1237                 }
1238
1239                 /* If op is non-idempotent */
1240                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1241                         plen = opdesc->op_rsize_bop(rqstp, op);
1242                         op->status = nfsd4_check_resp_size(resp, plen);
1243                 }
1244
1245                 if (op->status)
1246                         goto encode_op;
1247
1248                 if (opdesc->op_func) {
1249                         if (opdesc->op_get_currentstateid)
1250                                 opdesc->op_get_currentstateid(cstate, &op->u);
1251                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1252                 } else
1253                         BUG_ON(op->status == nfs_ok);
1254
1255                 if (!op->status) {
1256                         if (opdesc->op_set_currentstateid)
1257                                 opdesc->op_set_currentstateid(cstate, &op->u);
1258
1259                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1260                                 clear_current_stateid(cstate);
1261
1262                         if (need_wrongsec_check(rqstp))
1263                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1264                 }
1265
1266 encode_op:
1267                 /* Only from SEQUENCE */
1268                 if (resp->cstate.status == nfserr_replay_cache) {
1269                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1270                         status = op->status;
1271                         goto out;
1272                 }
1273                 if (op->status == nfserr_replay_me) {
1274                         op->replay = &cstate->replay_owner->so_replay;
1275                         nfsd4_encode_replay(resp, op);
1276                         status = op->status = op->replay->rp_status;
1277                 } else {
1278                         nfsd4_encode_operation(resp, op);
1279                         status = op->status;
1280                 }
1281
1282                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1283                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1284                         be32_to_cpu(status));
1285
1286                 if (cstate->replay_owner) {
1287                         nfs4_unlock_state();
1288                         cstate->replay_owner = NULL;
1289                 }
1290                 /* XXX Ugh, we need to get rid of this kind of special case: */
1291                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1292                         fput(op->u.read.rd_filp);
1293
1294                 nfsd4_increment_op_stats(op->opnum);
1295         }
1296
1297         resp->cstate.status = status;
1298         fh_put(&resp->cstate.current_fh);
1299         fh_put(&resp->cstate.save_fh);
1300         BUG_ON(resp->cstate.replay_owner);
1301 out:
1302         /* Reset deferral mechanism for RPC deferrals */
1303         rqstp->rq_usedeferral = 1;
1304         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1305         return status;
1306 }
1307
1308 #define op_encode_hdr_size              (2)
1309 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1310 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1311 #define op_encode_change_info_maxsz     (5)
1312 #define nfs4_fattr_bitmap_maxsz         (4)
1313
1314 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1315 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1316
1317 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1318
1319 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1320 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1321                                          op_encode_ace_maxsz)
1322
1323 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1324
1325 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1326 {
1327         return (op_encode_hdr_size) * sizeof(__be32);
1328 }
1329
1330 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1331 {
1332         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1333 }
1334
1335 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1336 {
1337         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1338 }
1339
1340 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1341 {
1342         return (op_encode_hdr_size + op_encode_change_info_maxsz
1343                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1344 }
1345
1346 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1347 {
1348         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1349                 * sizeof(__be32);
1350 }
1351
1352 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1353 {
1354         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1355                 * sizeof(__be32);
1356 }
1357
1358 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1359 {
1360         return (op_encode_hdr_size + op_encode_stateid_maxsz
1361                 + op_encode_change_info_maxsz + 1
1362                 + nfs4_fattr_bitmap_maxsz
1363                 + op_encode_delegation_maxsz) * sizeof(__be32);
1364 }
1365
1366 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1367 {
1368         u32 maxcount = 0, rlen = 0;
1369
1370         maxcount = svc_max_payload(rqstp);
1371         rlen = op->u.read.rd_length;
1372
1373         if (rlen > maxcount)
1374                 rlen = maxcount;
1375
1376         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1377 }
1378
1379 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1380 {
1381         u32 rlen = op->u.readdir.rd_maxcount;
1382
1383         if (rlen > PAGE_SIZE)
1384                 rlen = PAGE_SIZE;
1385
1386         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1387                  * sizeof(__be32) + rlen;
1388 }
1389
1390 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1391 {
1392         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1393                 * sizeof(__be32);
1394 }
1395
1396 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1397 {
1398         return (op_encode_hdr_size + op_encode_change_info_maxsz
1399                 + op_encode_change_info_maxsz) * sizeof(__be32);
1400 }
1401
1402 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1403 {
1404         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1405 }
1406
1407 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1408 {
1409         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1410 }
1411
1412 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1413 {
1414         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1415 }
1416
1417 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1418 {
1419         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1420                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1421                 2 + /*eir_server_owner.so_minor_id */\
1422                 /* eir_server_owner.so_major_id<> */\
1423                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1424                 /* eir_server_scope<> */\
1425                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1426                 1 + /* eir_server_impl_id array length */\
1427                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1428 }
1429
1430 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1431 {
1432         return (op_encode_hdr_size + \
1433                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1434                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1435 }
1436
1437 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1438 {
1439         return (op_encode_hdr_size + \
1440                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1441                 2 + /* csr_sequence, csr_flags */\
1442                 op_encode_channel_attrs_maxsz + \
1443                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1444 }
1445
1446 static struct nfsd4_operation nfsd4_ops[] = {
1447         [OP_ACCESS] = {
1448                 .op_func = (nfsd4op_func)nfsd4_access,
1449                 .op_name = "OP_ACCESS",
1450         },
1451         [OP_CLOSE] = {
1452                 .op_func = (nfsd4op_func)nfsd4_close,
1453                 .op_flags = OP_MODIFIES_SOMETHING,
1454                 .op_name = "OP_CLOSE",
1455                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1456                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1457                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1458         },
1459         [OP_COMMIT] = {
1460                 .op_func = (nfsd4op_func)nfsd4_commit,
1461                 .op_flags = OP_MODIFIES_SOMETHING,
1462                 .op_name = "OP_COMMIT",
1463                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1464         },
1465         [OP_CREATE] = {
1466                 .op_func = (nfsd4op_func)nfsd4_create,
1467                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1468                 .op_name = "OP_CREATE",
1469                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1470         },
1471         [OP_DELEGRETURN] = {
1472                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1473                 .op_flags = OP_MODIFIES_SOMETHING,
1474                 .op_name = "OP_DELEGRETURN",
1475                 .op_rsize_bop = nfsd4_only_status_rsize,
1476                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1477         },
1478         [OP_GETATTR] = {
1479                 .op_func = (nfsd4op_func)nfsd4_getattr,
1480                 .op_flags = ALLOWED_ON_ABSENT_FS,
1481                 .op_name = "OP_GETATTR",
1482         },
1483         [OP_GETFH] = {
1484                 .op_func = (nfsd4op_func)nfsd4_getfh,
1485                 .op_name = "OP_GETFH",
1486         },
1487         [OP_LINK] = {
1488                 .op_func = (nfsd4op_func)nfsd4_link,
1489                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1490                                 | OP_CACHEME,
1491                 .op_name = "OP_LINK",
1492                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1493         },
1494         [OP_LOCK] = {
1495                 .op_func = (nfsd4op_func)nfsd4_lock,
1496                 .op_flags = OP_MODIFIES_SOMETHING,
1497                 .op_name = "OP_LOCK",
1498                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1499                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1500         },
1501         [OP_LOCKT] = {
1502                 .op_func = (nfsd4op_func)nfsd4_lockt,
1503                 .op_name = "OP_LOCKT",
1504         },
1505         [OP_LOCKU] = {
1506                 .op_func = (nfsd4op_func)nfsd4_locku,
1507                 .op_flags = OP_MODIFIES_SOMETHING,
1508                 .op_name = "OP_LOCKU",
1509                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1510                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1511         },
1512         [OP_LOOKUP] = {
1513                 .op_func = (nfsd4op_func)nfsd4_lookup,
1514                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1515                 .op_name = "OP_LOOKUP",
1516         },
1517         [OP_LOOKUPP] = {
1518                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1519                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1520                 .op_name = "OP_LOOKUPP",
1521         },
1522         [OP_NVERIFY] = {
1523                 .op_func = (nfsd4op_func)nfsd4_nverify,
1524                 .op_name = "OP_NVERIFY",
1525         },
1526         [OP_OPEN] = {
1527                 .op_func = (nfsd4op_func)nfsd4_open,
1528                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1529                 .op_name = "OP_OPEN",
1530                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1531                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1532         },
1533         [OP_OPEN_CONFIRM] = {
1534                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1535                 .op_flags = OP_MODIFIES_SOMETHING,
1536                 .op_name = "OP_OPEN_CONFIRM",
1537                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1538         },
1539         [OP_OPEN_DOWNGRADE] = {
1540                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1541                 .op_flags = OP_MODIFIES_SOMETHING,
1542                 .op_name = "OP_OPEN_DOWNGRADE",
1543                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1544                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1545                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1546         },
1547         [OP_PUTFH] = {
1548                 .op_func = (nfsd4op_func)nfsd4_putfh,
1549                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1550                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1551                                 | OP_CLEAR_STATEID,
1552                 .op_name = "OP_PUTFH",
1553                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1554         },
1555         [OP_PUTPUBFH] = {
1556                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1557                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1558                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1559                                 | OP_CLEAR_STATEID,
1560                 .op_name = "OP_PUTPUBFH",
1561                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1562         },
1563         [OP_PUTROOTFH] = {
1564                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1565                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1566                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1567                                 | OP_CLEAR_STATEID,
1568                 .op_name = "OP_PUTROOTFH",
1569                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1570         },
1571         [OP_READ] = {
1572                 .op_func = (nfsd4op_func)nfsd4_read,
1573                 .op_flags = OP_MODIFIES_SOMETHING,
1574                 .op_name = "OP_READ",
1575                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1576                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1577         },
1578         [OP_READDIR] = {
1579                 .op_func = (nfsd4op_func)nfsd4_readdir,
1580                 .op_flags = OP_MODIFIES_SOMETHING,
1581                 .op_name = "OP_READDIR",
1582                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1583         },
1584         [OP_READLINK] = {
1585                 .op_func = (nfsd4op_func)nfsd4_readlink,
1586                 .op_name = "OP_READLINK",
1587         },
1588         [OP_REMOVE] = {
1589                 .op_func = (nfsd4op_func)nfsd4_remove,
1590                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1591                 .op_name = "OP_REMOVE",
1592                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1593         },
1594         [OP_RENAME] = {
1595                 .op_func = (nfsd4op_func)nfsd4_rename,
1596                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1597                 .op_name = "OP_RENAME",
1598                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1599         },
1600         [OP_RENEW] = {
1601                 .op_func = (nfsd4op_func)nfsd4_renew,
1602                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1603                                 | OP_MODIFIES_SOMETHING,
1604                 .op_name = "OP_RENEW",
1605                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1606
1607         },
1608         [OP_RESTOREFH] = {
1609                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1610                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1611                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1612                 .op_name = "OP_RESTOREFH",
1613                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1614         },
1615         [OP_SAVEFH] = {
1616                 .op_func = (nfsd4op_func)nfsd4_savefh,
1617                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1618                 .op_name = "OP_SAVEFH",
1619                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1620         },
1621         [OP_SECINFO] = {
1622                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1623                 .op_flags = OP_HANDLES_WRONGSEC,
1624                 .op_name = "OP_SECINFO",
1625         },
1626         [OP_SETATTR] = {
1627                 .op_func = (nfsd4op_func)nfsd4_setattr,
1628                 .op_name = "OP_SETATTR",
1629                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1630                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1631                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1632         },
1633         [OP_SETCLIENTID] = {
1634                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1635                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1636                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1637                 .op_name = "OP_SETCLIENTID",
1638                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1639         },
1640         [OP_SETCLIENTID_CONFIRM] = {
1641                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1642                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1643                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1644                 .op_name = "OP_SETCLIENTID_CONFIRM",
1645                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1646         },
1647         [OP_VERIFY] = {
1648                 .op_func = (nfsd4op_func)nfsd4_verify,
1649                 .op_name = "OP_VERIFY",
1650         },
1651         [OP_WRITE] = {
1652                 .op_func = (nfsd4op_func)nfsd4_write,
1653                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1654                 .op_name = "OP_WRITE",
1655                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1656                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1657         },
1658         [OP_RELEASE_LOCKOWNER] = {
1659                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1660                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1661                                 | OP_MODIFIES_SOMETHING,
1662                 .op_name = "OP_RELEASE_LOCKOWNER",
1663                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1664         },
1665
1666         /* NFSv4.1 operations */
1667         [OP_EXCHANGE_ID] = {
1668                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1669                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1670                                 | OP_MODIFIES_SOMETHING,
1671                 .op_name = "OP_EXCHANGE_ID",
1672                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1673         },
1674         [OP_BACKCHANNEL_CTL] = {
1675                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1676                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1677                 .op_name = "OP_BACKCHANNEL_CTL",
1678                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1679         },
1680         [OP_BIND_CONN_TO_SESSION] = {
1681                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1682                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1683                                 | OP_MODIFIES_SOMETHING,
1684                 .op_name = "OP_BIND_CONN_TO_SESSION",
1685                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1686         },
1687         [OP_CREATE_SESSION] = {
1688                 .op_func = (nfsd4op_func)nfsd4_create_session,
1689                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1690                                 | OP_MODIFIES_SOMETHING,
1691                 .op_name = "OP_CREATE_SESSION",
1692                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1693         },
1694         [OP_DESTROY_SESSION] = {
1695                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1696                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1697                                 | OP_MODIFIES_SOMETHING,
1698                 .op_name = "OP_DESTROY_SESSION",
1699                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1700         },
1701         [OP_SEQUENCE] = {
1702                 .op_func = (nfsd4op_func)nfsd4_sequence,
1703                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1704                 .op_name = "OP_SEQUENCE",
1705         },
1706         [OP_DESTROY_CLIENTID] = {
1707                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1708                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1709                                 | OP_MODIFIES_SOMETHING,
1710                 .op_name = "OP_DESTROY_CLIENTID",
1711                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1712         },
1713         [OP_RECLAIM_COMPLETE] = {
1714                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1715                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1716                 .op_name = "OP_RECLAIM_COMPLETE",
1717                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1718         },
1719         [OP_SECINFO_NO_NAME] = {
1720                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1721                 .op_flags = OP_HANDLES_WRONGSEC,
1722                 .op_name = "OP_SECINFO_NO_NAME",
1723         },
1724         [OP_TEST_STATEID] = {
1725                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1726                 .op_flags = ALLOWED_WITHOUT_FH,
1727                 .op_name = "OP_TEST_STATEID",
1728         },
1729         [OP_FREE_STATEID] = {
1730                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1731                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1732                 .op_name = "OP_FREE_STATEID",
1733                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1734         },
1735 };
1736
1737 #ifdef NFSD_DEBUG
1738 static const char *nfsd4_op_name(unsigned opnum)
1739 {
1740         if (opnum < ARRAY_SIZE(nfsd4_ops))
1741                 return nfsd4_ops[opnum].op_name;
1742         return "unknown_operation";
1743 }
1744 #endif
1745
1746 #define nfsd4_voidres                   nfsd4_voidargs
1747 struct nfsd4_voidargs { int dummy; };
1748
1749 static struct svc_procedure             nfsd_procedures4[2] = {
1750         [NFSPROC4_NULL] = {
1751                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1752                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1753                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1754                 .pc_ressize = sizeof(struct nfsd4_voidres),
1755                 .pc_cachetype = RC_NOCACHE,
1756                 .pc_xdrressize = 1,
1757         },
1758         [NFSPROC4_COMPOUND] = {
1759                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1760                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1761                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1762                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1763                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1764                 .pc_release = nfsd4_release_compoundargs,
1765                 .pc_cachetype = RC_NOCACHE,
1766                 .pc_xdrressize = NFSD_BUFSIZE/4,
1767         },
1768 };
1769
1770 struct svc_version      nfsd_version4 = {
1771                 .vs_vers        = 4,
1772                 .vs_nproc       = 2,
1773                 .vs_proc        = nfsd_procedures4,
1774                 .vs_dispatch    = nfsd_dispatch,
1775                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1776 };
1777
1778 /*
1779  * Local variables:
1780  *  c-basic-offset: 8
1781  * End:
1782  */