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 int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 885 {
 886         int i = 1;
 887         int buflen = write->wr_buflen;
 888
 889         vec[0].iov_base = write->wr_head.iov_base;
 890         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 891         buflen -= vec[0].iov_len;
 892
 893         while (buflen) {
 894                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 895                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 896                 buflen -= vec[i].iov_len;
 897                 i++;
 898         }
 899         return i;
 900 }
 901
 902 static __be32
 903 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 904             struct nfsd4_write *write)
 905 {
 906         stateid_t *stateid = &write->wr_stateid;
 907         struct file *filp = NULL;
 908         __be32 status = nfs_ok;
 909         unsigned long cnt;
 910         int nvecs;
 911
 912         /* no need to check permission - this will be done in nfsd_write() */
 913
 914         if (write->wr_offset >= OFFSET_MAX)
 915                 return nfserr_inval;
 916
 917         nfs4_lock_state();
 918         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 919                                         cstate, stateid, WR_STATE, &filp);
 920         if (filp)
 921                 get_file(filp);
 922         nfs4_unlock_state();
 923
 924         if (status) {
 925                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 926                 return status;
 927         }
 928
 929         cnt = write->wr_buflen;
 930         write->wr_how_written = write->wr_stable_how;
 931         gen_boot_verifier(&write->wr_verifier);
 932
 933         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
 934         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 935
 936         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 937                              write->wr_offset, rqstp->rq_vec, nvecs,
 938                              &cnt, &write->wr_how_written);
 939         if (filp)
 940                 fput(filp);
 941
 942         write->wr_bytes_written = cnt;
 943
 944         return status;
 945 }
 946
 947 /* This routine never returns NFS_OK!  If there are no other errors, it
 948  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 949  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 950  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 951  */
 952 static __be32
 953 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 954              struct nfsd4_verify *verify)
 955 {
 956         __be32 *buf, *p;
 957         int count;
 958         __be32 status;
 959
 960         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 961         if (status)
 962                 return status;
 963
 964         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 965         if (status)
 966                 return status;
 967
 968         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 969             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 970                 return nfserr_inval;
 971         if (verify->ve_attrlen & 3)
 972                 return nfserr_inval;
 973
 974         /* count in words:
 975          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 976          */
 977         count = 4 + (verify->ve_attrlen >> 2);
 978         buf = kmalloc(count << 2, GFP_KERNEL);
 979         if (!buf)
 980                 return nfserr_jukebox;
 981
 982         status = nfsd4_encode_fattr(&cstate->current_fh,
 983                                     cstate->current_fh.fh_export,
 984                                     cstate->current_fh.fh_dentry, buf,
 985                                     &count, verify->ve_bmval,
 986                                     rqstp, 0);
 987
 988         /* this means that nfsd4_encode_fattr() ran out of space */
 989         if (status == nfserr_resource && count == 0)
 990                 status = nfserr_not_same;
 991         if (status)
 992                 goto out_kfree;
 993
 994         /* skip bitmap */
 995         p = buf + 1 + ntohl(buf[0]);
 996         status = nfserr_not_same;
 997         if (ntohl(*p++) != verify->ve_attrlen)
 998                 goto out_kfree;
 999         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1000                 status = nfserr_same;
1001
1002 out_kfree:
1003         kfree(buf);
1004         return status;
1005 }
1006
1007 static __be32
1008 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1009               struct nfsd4_verify *verify)
1010 {
1011         __be32 status;
1012
1013         status = _nfsd4_verify(rqstp, cstate, verify);
1014         return status == nfserr_not_same ? nfs_ok : status;
1015 }
1016
1017 static __be32
1018 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1019              struct nfsd4_verify *verify)
1020 {
1021         __be32 status;
1022
1023         status = _nfsd4_verify(rqstp, cstate, verify);
1024         return status == nfserr_same ? nfs_ok : status;
1025 }
1026
1027 /*
1028  * NULL call.
1029  */
1030 static __be32
1031 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1032 {
1033         return nfs_ok;
1034 }
1035
1036 static inline void nfsd4_increment_op_stats(u32 opnum)
1037 {
1038         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1039                 nfsdstats.nfs4_opcount[opnum]++;
1040 }
1041
1042 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1043                               void *);
1044 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1045 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1046 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1047
1048 enum nfsd4_op_flags {
1049         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1050         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1051         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1052         /* For rfc 5661 section 2.6.3.1.1: */
1053         OP_HANDLES_WRONGSEC = 1 << 3,
1054         OP_IS_PUTFH_LIKE = 1 << 4,
1055         /*
1056          * These are the ops whose result size we estimate before
1057          * encoding, to avoid performing an op then not being able to
1058          * respond or cache a response.  This includes writes and setattrs
1059          * as well as the operations usually called "nonidempotent":
1060          */
1061         OP_MODIFIES_SOMETHING = 1 << 5,
1062         /*
1063          * Cache compounds containing these ops in the xid-based drc:
1064          * We use the DRC for compounds containing non-idempotent
1065          * operations, *except* those that are 4.1-specific (since
1066          * sessions provide their own EOS), and except for stateful
1067          * operations other than setclientid and setclientid_confirm
1068          * (since sequence numbers provide EOS for open, lock, etc in
1069          * the v4.0 case).
1070          */
1071         OP_CACHEME = 1 << 6,
1072         /*
1073          * These are ops which clear current state id.
1074          */
1075         OP_CLEAR_STATEID = 1 << 7,
1076 };
1077
1078 struct nfsd4_operation {
1079         nfsd4op_func op_func;
1080         u32 op_flags;
1081         char *op_name;
1082         /* Try to get response size before operation */
1083         nfsd4op_rsize op_rsize_bop;
1084         stateid_getter op_get_currentstateid;
1085         stateid_setter op_set_currentstateid;
1086 };
1087
1088 static struct nfsd4_operation nfsd4_ops[];
1089
1090 #ifdef NFSD_DEBUG
1091 static const char *nfsd4_op_name(unsigned opnum);
1092 #endif
1093
1094 /*
1095  * Enforce NFSv4.1 COMPOUND ordering rules:
1096  *
1097  * Also note, enforced elsewhere:
1098  *      - SEQUENCE other than as first op results in
1099  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1100  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1101  *        (Enforced in nfsd4_bind_conn_to_session().)
1102  *      - DESTROY_SESSION must be the final operation in a compound, if
1103  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1104  *        (Enforced in nfsd4_destroy_session().)
1105  */
1106 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1107 {
1108         struct nfsd4_op *op = &args->ops[0];
1109
1110         /* These ordering requirements don't apply to NFSv4.0: */
1111         if (args->minorversion == 0)
1112                 return nfs_ok;
1113         /* This is weird, but OK, not our problem: */
1114         if (args->opcnt == 0)
1115                 return nfs_ok;
1116         if (op->status == nfserr_op_illegal)
1117                 return nfs_ok;
1118         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1119                 return nfserr_op_not_in_session;
1120         if (op->opnum == OP_SEQUENCE)
1121                 return nfs_ok;
1122         if (args->opcnt != 1)
1123                 return nfserr_not_only_op;
1124         return nfs_ok;
1125 }
1126
1127 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1128 {
1129         return &nfsd4_ops[op->opnum];
1130 }
1131
1132 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1133 {
1134         return OPDESC(op)->op_flags & OP_CACHEME;
1135 }
1136
1137 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1138 {
1139         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1140         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1141         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1142         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1143         struct nfsd4_operation *thisd;
1144         struct nfsd4_operation *nextd;
1145
1146         thisd = OPDESC(this);
1147         /*
1148          * Most ops check wronsec on our own; only the putfh-like ops
1149          * have special rules.
1150          */
1151         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1152                 return false;
1153         /*
1154          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1155          * put-filehandle operation if we're not going to use the
1156          * result:
1157          */
1158         if (argp->opcnt == resp->opcnt)
1159                 return false;
1160
1161         nextd = OPDESC(next);
1162         /*
1163          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1164          * errors themselves as necessary; others should check for them
1165          * now:
1166          */
1167         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1168 }
1169
1170 /*
1171  * COMPOUND call.
1172  */
1173 static __be32
1174 nfsd4_proc_compound(struct svc_rqst *rqstp,
1175                     struct nfsd4_compoundargs *args,
1176                     struct nfsd4_compoundres *resp)
1177 {
1178         struct nfsd4_op *op;
1179         struct nfsd4_operation *opdesc;
1180         struct nfsd4_compound_state *cstate = &resp->cstate;
1181         int             slack_bytes;
1182         u32             plen = 0;
1183         __be32          status;
1184
1185         resp->xbuf = &rqstp->rq_res;
1186         resp->p = rqstp->rq_res.head[0].iov_base +
1187                                                 rqstp->rq_res.head[0].iov_len;
1188         resp->tagp = resp->p;
1189         /* reserve space for: taglen, tag, and opcnt */
1190         resp->p += 2 + XDR_QUADLEN(args->taglen);
1191         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1192         resp->taglen = args->taglen;
1193         resp->tag = args->tag;
1194         resp->opcnt = 0;
1195         resp->rqstp = rqstp;
1196         resp->cstate.minorversion = args->minorversion;
1197         resp->cstate.replay_owner = NULL;
1198         resp->cstate.session = NULL;
1199         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1200         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1201         /*
1202          * Don't use the deferral mechanism for NFSv4; compounds make it
1203          * too hard to avoid non-idempotency problems.
1204          */
1205         rqstp->rq_usedeferral = 0;
1206
1207         /*
1208          * According to RFC3010, this takes precedence over all other errors.
1209          */
1210         status = nfserr_minor_vers_mismatch;
1211         if (args->minorversion > nfsd_supported_minorversion)
1212                 goto out;
1213
1214         status = nfs41_check_op_ordering(args);
1215         if (status) {
1216                 op = &args->ops[0];
1217                 op->status = status;
1218                 goto encode_op;
1219         }
1220
1221         while (!status && resp->opcnt < args->opcnt) {
1222                 op = &args->ops[resp->opcnt++];
1223
1224                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1225                         resp->opcnt, args->opcnt, op->opnum,
1226                         nfsd4_op_name(op->opnum));
1227                 /*
1228                  * The XDR decode routines may have pre-set op->status;
1229                  * for example, if there is a miscellaneous XDR error
1230                  * it will be set to nfserr_bad_xdr.
1231                  */
1232                 if (op->status)
1233                         goto encode_op;
1234
1235                 /* We must be able to encode a successful response to
1236                  * this operation, with enough room left over to encode a
1237                  * failed response to the next operation.  If we don't
1238                  * have enough room, fail with ERR_RESOURCE.
1239                  */
1240                 slack_bytes = (char *)resp->end - (char *)resp->p;
1241                 if (slack_bytes < COMPOUND_SLACK_SPACE
1242                                 + COMPOUND_ERR_SLACK_SPACE) {
1243                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1244                         op->status = nfserr_resource;
1245                         goto encode_op;
1246                 }
1247
1248                 opdesc = OPDESC(op);
1249
1250                 if (!cstate->current_fh.fh_dentry) {
1251                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1252                                 op->status = nfserr_nofilehandle;
1253                                 goto encode_op;
1254                         }
1255                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1256                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1257                         op->status = nfserr_moved;
1258                         goto encode_op;
1259                 }
1260
1261                 /* If op is non-idempotent */
1262                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1263                         plen = opdesc->op_rsize_bop(rqstp, op);
1264                         op->status = nfsd4_check_resp_size(resp, plen);
1265                 }
1266
1267                 if (op->status)
1268                         goto encode_op;
1269
1270                 if (opdesc->op_func) {
1271                         if (opdesc->op_get_currentstateid)
1272                                 opdesc->op_get_currentstateid(cstate, &op->u);
1273                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1274                 } else
1275                         BUG_ON(op->status == nfs_ok);
1276
1277                 if (!op->status) {
1278                         if (opdesc->op_set_currentstateid)
1279                                 opdesc->op_set_currentstateid(cstate, &op->u);
1280
1281                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1282                                 clear_current_stateid(cstate);
1283
1284                         if (need_wrongsec_check(rqstp))
1285                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1286                 }
1287
1288 encode_op:
1289                 /* Only from SEQUENCE */
1290                 if (resp->cstate.status == nfserr_replay_cache) {
1291                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1292                         status = op->status;
1293                         goto out;
1294                 }
1295                 if (op->status == nfserr_replay_me) {
1296                         op->replay = &cstate->replay_owner->so_replay;
1297                         nfsd4_encode_replay(resp, op);
1298                         status = op->status = op->replay->rp_status;
1299                 } else {
1300                         nfsd4_encode_operation(resp, op);
1301                         status = op->status;
1302                 }
1303
1304                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1305                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1306                         be32_to_cpu(status));
1307
1308                 if (cstate->replay_owner) {
1309                         nfs4_unlock_state();
1310                         cstate->replay_owner = NULL;
1311                 }
1312                 /* XXX Ugh, we need to get rid of this kind of special case: */
1313                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1314                         fput(op->u.read.rd_filp);
1315
1316                 nfsd4_increment_op_stats(op->opnum);
1317         }
1318
1319         resp->cstate.status = status;
1320         fh_put(&resp->cstate.current_fh);
1321         fh_put(&resp->cstate.save_fh);
1322         BUG_ON(resp->cstate.replay_owner);
1323 out:
1324         /* Reset deferral mechanism for RPC deferrals */
1325         rqstp->rq_usedeferral = 1;
1326         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1327         return status;
1328 }
1329
1330 #define op_encode_hdr_size              (2)
1331 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1332 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1333 #define op_encode_change_info_maxsz     (5)
1334 #define nfs4_fattr_bitmap_maxsz         (4)
1335
1336 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1337 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1338
1339 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1340
1341 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1342 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1343                                          op_encode_ace_maxsz)
1344
1345 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1346
1347 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1348 {
1349         return (op_encode_hdr_size) * sizeof(__be32);
1350 }
1351
1352 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1353 {
1354         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1355 }
1356
1357 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1358 {
1359         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1360 }
1361
1362 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1363 {
1364         return (op_encode_hdr_size + op_encode_change_info_maxsz
1365                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1366 }
1367
1368 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1369 {
1370         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1371                 * sizeof(__be32);
1372 }
1373
1374 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1375 {
1376         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1377                 * sizeof(__be32);
1378 }
1379
1380 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1381 {
1382         return (op_encode_hdr_size + op_encode_stateid_maxsz
1383                 + op_encode_change_info_maxsz + 1
1384                 + nfs4_fattr_bitmap_maxsz
1385                 + op_encode_delegation_maxsz) * sizeof(__be32);
1386 }
1387
1388 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1389 {
1390         u32 maxcount = 0, rlen = 0;
1391
1392         maxcount = svc_max_payload(rqstp);
1393         rlen = op->u.read.rd_length;
1394
1395         if (rlen > maxcount)
1396                 rlen = maxcount;
1397
1398         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1399 }
1400
1401 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1402 {
1403         u32 rlen = op->u.readdir.rd_maxcount;
1404
1405         if (rlen > PAGE_SIZE)
1406                 rlen = PAGE_SIZE;
1407
1408         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1409                  * sizeof(__be32) + rlen;
1410 }
1411
1412 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1413 {
1414         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1415                 * sizeof(__be32);
1416 }
1417
1418 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1419 {
1420         return (op_encode_hdr_size + op_encode_change_info_maxsz
1421                 + op_encode_change_info_maxsz) * sizeof(__be32);
1422 }
1423
1424 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1425 {
1426         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1427 }
1428
1429 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1430 {
1431         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1432 }
1433
1434 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1435 {
1436         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1437 }
1438
1439 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1440 {
1441         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1442                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1443                 2 + /*eir_server_owner.so_minor_id */\
1444                 /* eir_server_owner.so_major_id<> */\
1445                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1446                 /* eir_server_scope<> */\
1447                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1448                 1 + /* eir_server_impl_id array length */\
1449                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1450 }
1451
1452 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1453 {
1454         return (op_encode_hdr_size + \
1455                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1456                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1457 }
1458
1459 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1460 {
1461         return (op_encode_hdr_size + \
1462                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1463                 2 + /* csr_sequence, csr_flags */\
1464                 op_encode_channel_attrs_maxsz + \
1465                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1466 }
1467
1468 static struct nfsd4_operation nfsd4_ops[] = {
1469         [OP_ACCESS] = {
1470                 .op_func = (nfsd4op_func)nfsd4_access,
1471                 .op_name = "OP_ACCESS",
1472         },
1473         [OP_CLOSE] = {
1474                 .op_func = (nfsd4op_func)nfsd4_close,
1475                 .op_flags = OP_MODIFIES_SOMETHING,
1476                 .op_name = "OP_CLOSE",
1477                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1478                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1479                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1480         },
1481         [OP_COMMIT] = {
1482                 .op_func = (nfsd4op_func)nfsd4_commit,
1483                 .op_flags = OP_MODIFIES_SOMETHING,
1484                 .op_name = "OP_COMMIT",
1485                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1486         },
1487         [OP_CREATE] = {
1488                 .op_func = (nfsd4op_func)nfsd4_create,
1489                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1490                 .op_name = "OP_CREATE",
1491                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1492         },
1493         [OP_DELEGRETURN] = {
1494                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1495                 .op_flags = OP_MODIFIES_SOMETHING,
1496                 .op_name = "OP_DELEGRETURN",
1497                 .op_rsize_bop = nfsd4_only_status_rsize,
1498                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1499         },
1500         [OP_GETATTR] = {
1501                 .op_func = (nfsd4op_func)nfsd4_getattr,
1502                 .op_flags = ALLOWED_ON_ABSENT_FS,
1503                 .op_name = "OP_GETATTR",
1504         },
1505         [OP_GETFH] = {
1506                 .op_func = (nfsd4op_func)nfsd4_getfh,
1507                 .op_name = "OP_GETFH",
1508         },
1509         [OP_LINK] = {
1510                 .op_func = (nfsd4op_func)nfsd4_link,
1511                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1512                                 | OP_CACHEME,
1513                 .op_name = "OP_LINK",
1514                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1515         },
1516         [OP_LOCK] = {
1517                 .op_func = (nfsd4op_func)nfsd4_lock,
1518                 .op_flags = OP_MODIFIES_SOMETHING,
1519                 .op_name = "OP_LOCK",
1520                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1521                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1522         },
1523         [OP_LOCKT] = {
1524                 .op_func = (nfsd4op_func)nfsd4_lockt,
1525                 .op_name = "OP_LOCKT",
1526         },
1527         [OP_LOCKU] = {
1528                 .op_func = (nfsd4op_func)nfsd4_locku,
1529                 .op_flags = OP_MODIFIES_SOMETHING,
1530                 .op_name = "OP_LOCKU",
1531                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1532                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1533         },
1534         [OP_LOOKUP] = {
1535                 .op_func = (nfsd4op_func)nfsd4_lookup,
1536                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1537                 .op_name = "OP_LOOKUP",
1538         },
1539         [OP_LOOKUPP] = {
1540                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1541                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1542                 .op_name = "OP_LOOKUPP",
1543         },
1544         [OP_NVERIFY] = {
1545                 .op_func = (nfsd4op_func)nfsd4_nverify,
1546                 .op_name = "OP_NVERIFY",
1547         },
1548         [OP_OPEN] = {
1549                 .op_func = (nfsd4op_func)nfsd4_open,
1550                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1551                 .op_name = "OP_OPEN",
1552                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1553                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1554         },
1555         [OP_OPEN_CONFIRM] = {
1556                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1557                 .op_flags = OP_MODIFIES_SOMETHING,
1558                 .op_name = "OP_OPEN_CONFIRM",
1559                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1560         },
1561         [OP_OPEN_DOWNGRADE] = {
1562                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1563                 .op_flags = OP_MODIFIES_SOMETHING,
1564                 .op_name = "OP_OPEN_DOWNGRADE",
1565                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1566                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1567                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1568         },
1569         [OP_PUTFH] = {
1570                 .op_func = (nfsd4op_func)nfsd4_putfh,
1571                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1572                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1573                                 | OP_CLEAR_STATEID,
1574                 .op_name = "OP_PUTFH",
1575                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1576         },
1577         [OP_PUTPUBFH] = {
1578                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1579                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1580                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1581                                 | OP_CLEAR_STATEID,
1582                 .op_name = "OP_PUTPUBFH",
1583                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1584         },
1585         [OP_PUTROOTFH] = {
1586                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1587                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1588                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1589                                 | OP_CLEAR_STATEID,
1590                 .op_name = "OP_PUTROOTFH",
1591                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1592         },
1593         [OP_READ] = {
1594                 .op_func = (nfsd4op_func)nfsd4_read,
1595                 .op_flags = OP_MODIFIES_SOMETHING,
1596                 .op_name = "OP_READ",
1597                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1598                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1599         },
1600         [OP_READDIR] = {
1601                 .op_func = (nfsd4op_func)nfsd4_readdir,
1602                 .op_flags = OP_MODIFIES_SOMETHING,
1603                 .op_name = "OP_READDIR",
1604                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1605         },
1606         [OP_READLINK] = {
1607                 .op_func = (nfsd4op_func)nfsd4_readlink,
1608                 .op_name = "OP_READLINK",
1609         },
1610         [OP_REMOVE] = {
1611                 .op_func = (nfsd4op_func)nfsd4_remove,
1612                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1613                 .op_name = "OP_REMOVE",
1614                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1615         },
1616         [OP_RENAME] = {
1617                 .op_func = (nfsd4op_func)nfsd4_rename,
1618                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1619                 .op_name = "OP_RENAME",
1620                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1621         },
1622         [OP_RENEW] = {
1623                 .op_func = (nfsd4op_func)nfsd4_renew,
1624                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1625                                 | OP_MODIFIES_SOMETHING,
1626                 .op_name = "OP_RENEW",
1627                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1628
1629         },
1630         [OP_RESTOREFH] = {
1631                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1632                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1633                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1634                 .op_name = "OP_RESTOREFH",
1635                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1636         },
1637         [OP_SAVEFH] = {
1638                 .op_func = (nfsd4op_func)nfsd4_savefh,
1639                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1640                 .op_name = "OP_SAVEFH",
1641                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1642         },
1643         [OP_SECINFO] = {
1644                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1645                 .op_flags = OP_HANDLES_WRONGSEC,
1646                 .op_name = "OP_SECINFO",
1647         },
1648         [OP_SETATTR] = {
1649                 .op_func = (nfsd4op_func)nfsd4_setattr,
1650                 .op_name = "OP_SETATTR",
1651                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1652                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1653                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1654         },
1655         [OP_SETCLIENTID] = {
1656                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1657                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1658                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1659                 .op_name = "OP_SETCLIENTID",
1660                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1661         },
1662         [OP_SETCLIENTID_CONFIRM] = {
1663                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1664                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1665                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1666                 .op_name = "OP_SETCLIENTID_CONFIRM",
1667                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1668         },
1669         [OP_VERIFY] = {
1670                 .op_func = (nfsd4op_func)nfsd4_verify,
1671                 .op_name = "OP_VERIFY",
1672         },
1673         [OP_WRITE] = {
1674                 .op_func = (nfsd4op_func)nfsd4_write,
1675                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1676                 .op_name = "OP_WRITE",
1677                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1678                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1679         },
1680         [OP_RELEASE_LOCKOWNER] = {
1681                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1682                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1683                                 | OP_MODIFIES_SOMETHING,
1684                 .op_name = "OP_RELEASE_LOCKOWNER",
1685                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1686         },
1687
1688         /* NFSv4.1 operations */
1689         [OP_EXCHANGE_ID] = {
1690                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1691                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1692                                 | OP_MODIFIES_SOMETHING,
1693                 .op_name = "OP_EXCHANGE_ID",
1694                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1695         },
1696         [OP_BACKCHANNEL_CTL] = {
1697                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1698                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1699                 .op_name = "OP_BACKCHANNEL_CTL",
1700                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1701         },
1702         [OP_BIND_CONN_TO_SESSION] = {
1703                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1704                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1705                                 | OP_MODIFIES_SOMETHING,
1706                 .op_name = "OP_BIND_CONN_TO_SESSION",
1707                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1708         },
1709         [OP_CREATE_SESSION] = {
1710                 .op_func = (nfsd4op_func)nfsd4_create_session,
1711                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1712                                 | OP_MODIFIES_SOMETHING,
1713                 .op_name = "OP_CREATE_SESSION",
1714                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1715         },
1716         [OP_DESTROY_SESSION] = {
1717                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1718                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1719                                 | OP_MODIFIES_SOMETHING,
1720                 .op_name = "OP_DESTROY_SESSION",
1721                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1722         },
1723         [OP_SEQUENCE] = {
1724                 .op_func = (nfsd4op_func)nfsd4_sequence,
1725                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1726                 .op_name = "OP_SEQUENCE",
1727         },
1728         [OP_DESTROY_CLIENTID] = {
1729                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1730                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1731                                 | OP_MODIFIES_SOMETHING,
1732                 .op_name = "OP_DESTROY_CLIENTID",
1733                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1734         },
1735         [OP_RECLAIM_COMPLETE] = {
1736                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1737                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1738                 .op_name = "OP_RECLAIM_COMPLETE",
1739                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1740         },
1741         [OP_SECINFO_NO_NAME] = {
1742                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1743                 .op_flags = OP_HANDLES_WRONGSEC,
1744                 .op_name = "OP_SECINFO_NO_NAME",
1745         },
1746         [OP_TEST_STATEID] = {
1747                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1748                 .op_flags = ALLOWED_WITHOUT_FH,
1749                 .op_name = "OP_TEST_STATEID",
1750         },
1751         [OP_FREE_STATEID] = {
1752                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1753                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1754                 .op_name = "OP_FREE_STATEID",
1755                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1756         },
1757 };
1758
1759 #ifdef NFSD_DEBUG
1760 static const char *nfsd4_op_name(unsigned opnum)
1761 {
1762         if (opnum < ARRAY_SIZE(nfsd4_ops))
1763                 return nfsd4_ops[opnum].op_name;
1764         return "unknown_operation";
1765 }
1766 #endif
1767
1768 #define nfsd4_voidres                   nfsd4_voidargs
1769 struct nfsd4_voidargs { int dummy; };
1770
1771 static struct svc_procedure             nfsd_procedures4[2] = {
1772         [NFSPROC4_NULL] = {
1773                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1774                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1775                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1776                 .pc_ressize = sizeof(struct nfsd4_voidres),
1777                 .pc_cachetype = RC_NOCACHE,
1778                 .pc_xdrressize = 1,
1779         },
1780         [NFSPROC4_COMPOUND] = {
1781                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1782                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1783                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1784                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1785                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1786                 .pc_release = nfsd4_release_compoundargs,
1787                 .pc_cachetype = RC_NOCACHE,
1788                 .pc_xdrressize = NFSD_BUFSIZE/4,
1789         },
1790 };
1791
1792 struct svc_version      nfsd_version4 = {
1793                 .vs_vers        = 4,
1794                 .vs_nproc       = 2,
1795                 .vs_proc        = nfsd_procedures4,
1796                 .vs_dispatch    = nfsd_dispatch,
1797                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1798 };
1799
1800 /*
1801  * Local variables:
1802  *  c-basic-offset: 8
1803  * End:
1804  */