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 "cache.h"
  39 #include "xdr4.h"
  40 #include "vfs.h"
  41
  42 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  43
  44 static u32 nfsd_attrmask[] = {
  45         NFSD_WRITEABLE_ATTRS_WORD0,
  46         NFSD_WRITEABLE_ATTRS_WORD1,
  47         NFSD_WRITEABLE_ATTRS_WORD2
  48 };
  49
  50 static u32 nfsd41_ex_attrmask[] = {
  51         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  52         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  53         NFSD_SUPPATTR_EXCLCREAT_WORD2
  54 };
  55
  56 static __be32
  57 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  58                    u32 *bmval, u32 *writable)
  59 {
  60         struct dentry *dentry = cstate->current_fh.fh_dentry;
  61
  62         /*
  63          * Check about attributes are supported by the NFSv4 server or not.
  64          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  65          */
  66         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  67             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  68             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  69                 return nfserr_attrnotsupp;
  70
  71         /*
  72          * Check FATTR4_WORD0_ACL can be supported
  73          * in current environment or not.
  74          */
  75         if (bmval[0] & FATTR4_WORD0_ACL) {
  76                 if (!IS_POSIXACL(dentry->d_inode))
  77                         return nfserr_attrnotsupp;
  78         }
  79
  80         /*
  81          * According to spec, read-only attributes return ERR_INVAL.
  82          */
  83         if (writable) {
  84                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  85                     (bmval[2] & ~writable[2]))
  86                         return nfserr_inval;
  87         }
  88
  89         return nfs_ok;
  90 }
  91
  92 static __be32
  93 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  94         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  95 {
  96         __be32 status = nfs_ok;
  97
  98         if (open->op_create == NFS4_OPEN_CREATE) {
  99                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 100                     || open->op_createmode == NFS4_CREATE_GUARDED)
 101                         status = check_attr_support(rqstp, cstate,
 102                                         open->op_bmval, nfsd_attrmask);
 103                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 104                         status = check_attr_support(rqstp, cstate,
 105                                         open->op_bmval, nfsd41_ex_attrmask);
 106         }
 107
 108         return status;
 109 }
 110
 111 static int
 112 is_create_with_attrs(struct nfsd4_open *open)
 113 {
 114         return open->op_create == NFS4_OPEN_CREATE
 115                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 116                     || open->op_createmode == NFS4_CREATE_GUARDED
 117                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 118 }
 119
 120 /*
 121  * if error occurs when setting the acl, just clear the acl bit
 122  * in the returned attr bitmap.
 123  */
 124 static void
 125 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 126                 struct nfs4_acl *acl, u32 *bmval)
 127 {
 128         __be32 status;
 129
 130         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 131         if (status)
 132                 /*
 133                  * We should probably fail the whole open at this point,
 134                  * but we've already created the file, so it's too late;
 135                  * So this seems the least of evils:
 136                  */
 137                 bmval[0] &= ~FATTR4_WORD0_ACL;
 138 }
 139
 140 static inline void
 141 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 142 {
 143         fh_put(dst);
 144         dget(src->fh_dentry);
 145         if (src->fh_export)
 146                 cache_get(&src->fh_export->h);
 147         *dst = *src;
 148 }
 149
 150 static __be32
 151 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 152 {
 153         __be32 status;
 154
 155         if (open->op_truncate &&
 156                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 157                 return nfserr_inval;
 158
 159         accmode |= NFSD_MAY_READ_IF_EXEC;
 160
 161         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 162                 accmode |= NFSD_MAY_READ;
 163         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 164                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 165         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 166                 accmode |= NFSD_MAY_WRITE;
 167
 168         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 169
 170         return status;
 171 }
 172
 173 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 174 {
 175         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 176
 177         if (S_ISREG(mode))
 178                 return nfs_ok;
 179         if (S_ISDIR(mode))
 180                 return nfserr_isdir;
 181         /*
 182          * Using err_symlink as our catch-all case may look odd; but
 183          * there's no other obvious error for this case in 4.0, and we
 184          * happen to know that it will cause the linux v4 client to do
 185          * the right thing on attempts to open something other than a
 186          * regular file.
 187          */
 188         return nfserr_symlink;
 189 }
 190
 191 static __be32
 192 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 193 {
 194         struct svc_fh resfh;
 195         __be32 status;
 196         int created = 0;
 197
 198         fh_init(&resfh, NFS4_FHSIZE);
 199         open->op_truncate = 0;
 200
 201         if (open->op_create) {
 202                 /* FIXME: check session persistence and pnfs flags.
 203                  * The nfsv4.1 spec requires the following semantics:
 204                  *
 205                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 206                  * Reply Cache  | server |                 |
 207                  * -------------+--------+-----------------+--------------------
 208                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 209                  *              |        |                 | (SHOULD)
 210                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 211                  *              |        |                 | (SHOULD NOT)
 212                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 213                  * yes          | no     | GUARDED4        | GUARDED4
 214                  * yes          | yes    | GUARDED4        | GUARDED4
 215                  */
 216
 217                 /*
 218                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 219                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 220                  */
 221                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 222                                         open->op_fname.len, &open->op_iattr,
 223                                         &resfh, open->op_createmode,
 224                                         (u32 *)open->op_verf.data,
 225                                         &open->op_truncate, &created);
 226
 227                 /*
 228                  * Following rfc 3530 14.2.16, use the returned bitmask
 229                  * to indicate which attributes we used to store the
 230                  * verifier:
 231                  */
 232                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 233                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 234                                                 FATTR4_WORD1_TIME_MODIFY);
 235         } else {
 236                 status = nfsd_lookup(rqstp, current_fh,
 237                                      open->op_fname.data, open->op_fname.len, &resfh);
 238                 fh_unlock(current_fh);
 239                 if (status)
 240                         goto out;
 241                 status = nfsd_check_obj_isreg(&resfh);
 242         }
 243         if (status)
 244                 goto out;
 245
 246         if (is_create_with_attrs(open) && open->op_acl != NULL)
 247                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 248
 249         set_change_info(&open->op_cinfo, current_fh);
 250         fh_dup2(current_fh, &resfh);
 251
 252         /* set reply cache */
 253         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 254                         &resfh.fh_handle);
 255         if (!created)
 256                 status = do_open_permission(rqstp, current_fh, open,
 257                                             NFSD_MAY_NOP);
 258
 259 out:
 260         fh_put(&resfh);
 261         return status;
 262 }
 263
 264 static __be32
 265 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 266 {
 267         __be32 status;
 268
 269         /* Only reclaims from previously confirmed clients are valid */
 270         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 271                 return 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
 309         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 310                 (int)open->op_fname.len, open->op_fname.data,
 311                 open->op_openowner);
 312
 313         /* This check required by spec. */
 314         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 315                 return nfserr_inval;
 316
 317         /*
 318          * RFC5661 18.51.3
 319          * Before RECLAIM_COMPLETE done, server should deny new lock
 320          */
 321         if (nfsd4_has_session(cstate) &&
 322             !cstate->session->se_client->cl_firststate &&
 323             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 324                 return nfserr_grace;
 325
 326         if (nfsd4_has_session(cstate))
 327                 copy_clientid(&open->op_clientid, cstate->session);
 328
 329         nfs4_lock_state();
 330
 331         /* check seqid for replay. set nfs4_owner */
 332         resp = rqstp->rq_resp;
 333         status = nfsd4_process_open1(&resp->cstate, open);
 334         if (status == nfserr_replay_me) {
 335                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 336                 fh_put(&cstate->current_fh);
 337                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 338                                 &rp->rp_openfh);
 339                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 340                 if (status)
 341                         dprintk("nfsd4_open: replay failed"
 342                                 " restoring previous filehandle\n");
 343                 else
 344                         status = nfserr_replay_me;
 345         }
 346         if (status)
 347                 goto out;
 348
 349         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 350         if (status)
 351                 goto out;
 352
 353         /* Openowner is now set, so sequence id will get bumped.  Now we need
 354          * these checks before we do any creates: */
 355         status = nfserr_grace;
 356         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 357                 goto out;
 358         status = nfserr_no_grace;
 359         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 360                 goto out;
 361
 362         switch (open->op_claim_type) {
 363                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 364                 case NFS4_OPEN_CLAIM_NULL:
 365                         /*
 366                          * (1) set CURRENT_FH to the file being opened,
 367                          * creating it if necessary, (2) set open->op_cinfo,
 368                          * (3) set open->op_truncate if the file is to be
 369                          * truncated after opening, (4) do permission checking.
 370                          */
 371                         status = do_open_lookup(rqstp, &cstate->current_fh,
 372                                                 open);
 373                         if (status)
 374                                 goto out;
 375                         break;
 376                 case NFS4_OPEN_CLAIM_PREVIOUS:
 377                         open->op_openowner->oo_confirmed = 1;
 378                         /*
 379                          * The CURRENT_FH is already set to the file being
 380                          * opened.  (1) set open->op_cinfo, (2) set
 381                          * open->op_truncate if the file is to be truncated
 382                          * after opening, (3) do permission checking.
 383                         */
 384                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 385                                                  open);
 386                         if (status)
 387                                 goto out;
 388                         break;
 389                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 390                         open->op_openowner->oo_confirmed = 1;
 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 out:
 408         if (open->op_openowner)
 409                 cstate->replay_owner = &open->op_openowner->oo_owner;
 410         else
 411                 nfs4_unlock_state();
 412         return status;
 413 }
 414
 415 /*
 416  * filehandle-manipulating ops.
 417  */
 418 static __be32
 419 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 420             struct svc_fh **getfh)
 421 {
 422         if (!cstate->current_fh.fh_dentry)
 423                 return nfserr_nofilehandle;
 424
 425         *getfh = &cstate->current_fh;
 426         return nfs_ok;
 427 }
 428
 429 static __be32
 430 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 431             struct nfsd4_putfh *putfh)
 432 {
 433         fh_put(&cstate->current_fh);
 434         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 435         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 436                putfh->pf_fhlen);
 437         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 438 }
 439
 440 static __be32
 441 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 442                 void *arg)
 443 {
 444         __be32 status;
 445
 446         fh_put(&cstate->current_fh);
 447         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 448         return status;
 449 }
 450
 451 static __be32
 452 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 453                 void *arg)
 454 {
 455         if (!cstate->save_fh.fh_dentry)
 456                 return nfserr_restorefh;
 457
 458         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 459         return nfs_ok;
 460 }
 461
 462 static __be32
 463 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 464              void *arg)
 465 {
 466         if (!cstate->current_fh.fh_dentry)
 467                 return nfserr_nofilehandle;
 468
 469         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 470         return nfs_ok;
 471 }
 472
 473 /*
 474  * misc nfsv4 ops
 475  */
 476 static __be32
 477 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 478              struct nfsd4_access *access)
 479 {
 480         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 481                 return nfserr_inval;
 482
 483         access->ac_resp_access = access->ac_req_access;
 484         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 485                            &access->ac_supported);
 486 }
 487
 488 static __be32
 489 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 490              struct nfsd4_commit *commit)
 491 {
 492         u32 *p = (u32 *)commit->co_verf.data;
 493         *p++ = nfssvc_boot.tv_sec;
 494         *p++ = nfssvc_boot.tv_usec;
 495
 496         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 497                              commit->co_count);
 498 }
 499
 500 static __be32
 501 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 502              struct nfsd4_create *create)
 503 {
 504         struct svc_fh resfh;
 505         __be32 status;
 506         dev_t rdev;
 507
 508         fh_init(&resfh, NFS4_FHSIZE);
 509
 510         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 511                            NFSD_MAY_CREATE);
 512         if (status)
 513                 return status;
 514
 515         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 516                                     nfsd_attrmask);
 517         if (status)
 518                 return status;
 519
 520         switch (create->cr_type) {
 521         case NF4LNK:
 522                 /* ugh! we have to null-terminate the linktext, or
 523                  * vfs_symlink() will choke.  it is always safe to
 524                  * null-terminate by brute force, since at worst we
 525                  * will overwrite the first byte of the create namelen
 526                  * in the XDR buffer, which has already been extracted
 527                  * during XDR decode.
 528                  */
 529                 create->cr_linkname[create->cr_linklen] = 0;
 530
 531                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 532                                       create->cr_name, create->cr_namelen,
 533                                       create->cr_linkname, create->cr_linklen,
 534                                       &resfh, &create->cr_iattr);
 535                 break;
 536
 537         case NF4BLK:
 538                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 539                 if (MAJOR(rdev) != create->cr_specdata1 ||
 540                     MINOR(rdev) != create->cr_specdata2)
 541                         return nfserr_inval;
 542                 status = nfsd_create(rqstp, &cstate->current_fh,
 543                                      create->cr_name, create->cr_namelen,
 544                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 545                 break;
 546
 547         case NF4CHR:
 548                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 549                 if (MAJOR(rdev) != create->cr_specdata1 ||
 550                     MINOR(rdev) != create->cr_specdata2)
 551                         return nfserr_inval;
 552                 status = nfsd_create(rqstp, &cstate->current_fh,
 553                                      create->cr_name, create->cr_namelen,
 554                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 555                 break;
 556
 557         case NF4SOCK:
 558                 status = nfsd_create(rqstp, &cstate->current_fh,
 559                                      create->cr_name, create->cr_namelen,
 560                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 561                 break;
 562
 563         case NF4FIFO:
 564                 status = nfsd_create(rqstp, &cstate->current_fh,
 565                                      create->cr_name, create->cr_namelen,
 566                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 567                 break;
 568
 569         case NF4DIR:
 570                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 571                 status = nfsd_create(rqstp, &cstate->current_fh,
 572                                      create->cr_name, create->cr_namelen,
 573                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 574                 break;
 575
 576         default:
 577                 status = nfserr_badtype;
 578         }
 579
 580         if (status)
 581                 goto out;
 582
 583         if (create->cr_acl != NULL)
 584                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 585                                 create->cr_bmval);
 586
 587         fh_unlock(&cstate->current_fh);
 588         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 589         fh_dup2(&cstate->current_fh, &resfh);
 590 out:
 591         fh_put(&resfh);
 592         return status;
 593 }
 594
 595 static __be32
 596 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 597               struct nfsd4_getattr *getattr)
 598 {
 599         __be32 status;
 600
 601         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 602         if (status)
 603                 return status;
 604
 605         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 606                 return nfserr_inval;
 607
 608         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 609         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 610         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 611
 612         getattr->ga_fhp = &cstate->current_fh;
 613         return nfs_ok;
 614 }
 615
 616 static __be32
 617 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 618            struct nfsd4_link *link)
 619 {
 620         __be32 status = nfserr_nofilehandle;
 621
 622         if (!cstate->save_fh.fh_dentry)
 623                 return status;
 624         status = nfsd_link(rqstp, &cstate->current_fh,
 625                            link->li_name, link->li_namelen, &cstate->save_fh);
 626         if (!status)
 627                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 628         return status;
 629 }
 630
 631 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 632 {
 633         struct svc_fh tmp_fh;
 634         __be32 ret;
 635
 636         fh_init(&tmp_fh, NFS4_FHSIZE);
 637         ret = exp_pseudoroot(rqstp, &tmp_fh);
 638         if (ret)
 639                 return ret;
 640         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 641                 fh_put(&tmp_fh);
 642                 return nfserr_noent;
 643         }
 644         fh_put(&tmp_fh);
 645         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 646 }
 647
 648 static __be32
 649 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 650               void *arg)
 651 {
 652         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 653 }
 654
 655 static __be32
 656 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 657              struct nfsd4_lookup *lookup)
 658 {
 659         return nfsd_lookup(rqstp, &cstate->current_fh,
 660                            lookup->lo_name, lookup->lo_len,
 661                            &cstate->current_fh);
 662 }
 663
 664 static __be32
 665 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 666            struct nfsd4_read *read)
 667 {
 668         __be32 status;
 669
 670         /* no need to check permission - this will be done in nfsd_read() */
 671
 672         read->rd_filp = NULL;
 673         if (read->rd_offset >= OFFSET_MAX)
 674                 return nfserr_inval;
 675
 676         nfs4_lock_state();
 677         /* check stateid */
 678         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 679                                                  RD_STATE, &read->rd_filp))) {
 680                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 681                 goto out;
 682         }
 683         if (read->rd_filp)
 684                 get_file(read->rd_filp);
 685         status = nfs_ok;
 686 out:
 687         nfs4_unlock_state();
 688         read->rd_rqstp = rqstp;
 689         read->rd_fhp = &cstate->current_fh;
 690         return status;
 691 }
 692
 693 static __be32
 694 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 695               struct nfsd4_readdir *readdir)
 696 {
 697         u64 cookie = readdir->rd_cookie;
 698         static const nfs4_verifier zeroverf;
 699
 700         /* no need to check permission - this will be done in nfsd_readdir() */
 701
 702         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 703                 return nfserr_inval;
 704
 705         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 706         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 707         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 708
 709         if ((cookie == 1) || (cookie == 2) ||
 710             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 711                 return nfserr_bad_cookie;
 712
 713         readdir->rd_rqstp = rqstp;
 714         readdir->rd_fhp = &cstate->current_fh;
 715         return nfs_ok;
 716 }
 717
 718 static __be32
 719 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 720                struct nfsd4_readlink *readlink)
 721 {
 722         readlink->rl_rqstp = rqstp;
 723         readlink->rl_fhp = &cstate->current_fh;
 724         return nfs_ok;
 725 }
 726
 727 static __be32
 728 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 729              struct nfsd4_remove *remove)
 730 {
 731         __be32 status;
 732
 733         if (locks_in_grace())
 734                 return nfserr_grace;
 735         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 736                              remove->rm_name, remove->rm_namelen);
 737         if (!status) {
 738                 fh_unlock(&cstate->current_fh);
 739                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 740         }
 741         return status;
 742 }
 743
 744 static __be32
 745 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 746              struct nfsd4_rename *rename)
 747 {
 748         __be32 status = nfserr_nofilehandle;
 749
 750         if (!cstate->save_fh.fh_dentry)
 751                 return status;
 752         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 753                                         & NFSEXP_NOSUBTREECHECK))
 754                 return nfserr_grace;
 755         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 756                              rename->rn_snamelen, &cstate->current_fh,
 757                              rename->rn_tname, rename->rn_tnamelen);
 758
 759         /* the underlying filesystem returns different error's than required
 760          * by NFSv4. both save_fh and current_fh have been verified.. */
 761         if (status == nfserr_isdir)
 762                 status = nfserr_exist;
 763         else if ((status == nfserr_notdir) &&
 764                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 765                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 766                 status = nfserr_exist;
 767
 768         if (!status) {
 769                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 770                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 771         }
 772         return status;
 773 }
 774
 775 static __be32
 776 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 777               struct nfsd4_secinfo *secinfo)
 778 {
 779         struct svc_fh resfh;
 780         struct svc_export *exp;
 781         struct dentry *dentry;
 782         __be32 err;
 783
 784         fh_init(&resfh, NFS4_FHSIZE);
 785         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 786         if (err)
 787                 return err;
 788         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 789                                     secinfo->si_name, secinfo->si_namelen,
 790                                     &exp, &dentry);
 791         if (err)
 792                 return err;
 793         if (dentry->d_inode == NULL) {
 794                 exp_put(exp);
 795                 err = nfserr_noent;
 796         } else
 797                 secinfo->si_exp = exp;
 798         dput(dentry);
 799         if (cstate->minorversion)
 800                 /* See rfc 5661 section 2.6.3.1.1.8 */
 801                 fh_put(&cstate->current_fh);
 802         return err;
 803 }
 804
 805 static __be32
 806 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 807               struct nfsd4_secinfo_no_name *sin)
 808 {
 809         __be32 err;
 810
 811         switch (sin->sin_style) {
 812         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 813                 break;
 814         case NFS4_SECINFO_STYLE4_PARENT:
 815                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 816                 if (err)
 817                         return err;
 818                 break;
 819         default:
 820                 return nfserr_inval;
 821         }
 822         exp_get(cstate->current_fh.fh_export);
 823         sin->sin_exp = cstate->current_fh.fh_export;
 824         fh_put(&cstate->current_fh);
 825         return nfs_ok;
 826 }
 827
 828 static __be32
 829 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 830               struct nfsd4_setattr *setattr)
 831 {
 832         __be32 status = nfs_ok;
 833
 834         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 835                 nfs4_lock_state();
 836                 status = nfs4_preprocess_stateid_op(cstate,
 837                         &setattr->sa_stateid, WR_STATE, NULL);
 838                 nfs4_unlock_state();
 839                 if (status) {
 840                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 841                         return status;
 842                 }
 843         }
 844         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 845         if (status)
 846                 return status;
 847         status = nfs_ok;
 848
 849         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 850                                     nfsd_attrmask);
 851         if (status)
 852                 goto out;
 853
 854         if (setattr->sa_acl != NULL)
 855                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 856                                             setattr->sa_acl);
 857         if (status)
 858                 goto out;
 859         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 860                                 0, (time_t)0);
 861 out:
 862         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 863         return status;
 864 }
 865
 866 static __be32
 867 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 868             struct nfsd4_write *write)
 869 {
 870         stateid_t *stateid = &write->wr_stateid;
 871         struct file *filp = NULL;
 872         u32 *p;
 873         __be32 status = nfs_ok;
 874         unsigned long cnt;
 875
 876         /* no need to check permission - this will be done in nfsd_write() */
 877
 878         if (write->wr_offset >= OFFSET_MAX)
 879                 return nfserr_inval;
 880
 881         nfs4_lock_state();
 882         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 883         if (filp)
 884                 get_file(filp);
 885         nfs4_unlock_state();
 886
 887         if (status) {
 888                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 889                 return status;
 890         }
 891
 892         cnt = write->wr_buflen;
 893         write->wr_how_written = write->wr_stable_how;
 894         p = (u32 *)write->wr_verifier.data;
 895         *p++ = nfssvc_boot.tv_sec;
 896         *p++ = nfssvc_boot.tv_usec;
 897
 898         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 899                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 900                              &cnt, &write->wr_how_written);
 901         if (filp)
 902                 fput(filp);
 903
 904         write->wr_bytes_written = cnt;
 905
 906         return status;
 907 }
 908
 909 /* This routine never returns NFS_OK!  If there are no other errors, it
 910  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 911  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 912  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 913  */
 914 static __be32
 915 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 916              struct nfsd4_verify *verify)
 917 {
 918         __be32 *buf, *p;
 919         int count;
 920         __be32 status;
 921
 922         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 923         if (status)
 924                 return status;
 925
 926         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 927         if (status)
 928                 return status;
 929
 930         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 931             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 932                 return nfserr_inval;
 933         if (verify->ve_attrlen & 3)
 934                 return nfserr_inval;
 935
 936         /* count in words:
 937          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 938          */
 939         count = 4 + (verify->ve_attrlen >> 2);
 940         buf = kmalloc(count << 2, GFP_KERNEL);
 941         if (!buf)
 942                 return nfserr_jukebox;
 943
 944         status = nfsd4_encode_fattr(&cstate->current_fh,
 945                                     cstate->current_fh.fh_export,
 946                                     cstate->current_fh.fh_dentry, buf,
 947                                     &count, verify->ve_bmval,
 948                                     rqstp, 0);
 949
 950         /* this means that nfsd4_encode_fattr() ran out of space */
 951         if (status == nfserr_resource && count == 0)
 952                 status = nfserr_not_same;
 953         if (status)
 954                 goto out_kfree;
 955
 956         /* skip bitmap */
 957         p = buf + 1 + ntohl(buf[0]);
 958         status = nfserr_not_same;
 959         if (ntohl(*p++) != verify->ve_attrlen)
 960                 goto out_kfree;
 961         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 962                 status = nfserr_same;
 963
 964 out_kfree:
 965         kfree(buf);
 966         return status;
 967 }
 968
 969 static __be32
 970 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 971               struct nfsd4_verify *verify)
 972 {
 973         __be32 status;
 974
 975         status = _nfsd4_verify(rqstp, cstate, verify);
 976         return status == nfserr_not_same ? nfs_ok : status;
 977 }
 978
 979 static __be32
 980 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 981              struct nfsd4_verify *verify)
 982 {
 983         __be32 status;
 984
 985         status = _nfsd4_verify(rqstp, cstate, verify);
 986         return status == nfserr_same ? nfs_ok : status;
 987 }
 988
 989 /*
 990  * NULL call.
 991  */
 992 static __be32
 993 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 994 {
 995         return nfs_ok;
 996 }
 997
 998 static inline void nfsd4_increment_op_stats(u32 opnum)
 999 {
1000         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1001                 nfsdstats.nfs4_opcount[opnum]++;
1002 }
1003
1004 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1005                               void *);
1006 enum nfsd4_op_flags {
1007         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1008         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1009         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1010         /* For rfc 5661 section 2.6.3.1.1: */
1011         OP_HANDLES_WRONGSEC = 1 << 3,
1012         OP_IS_PUTFH_LIKE = 1 << 4,
1013 };
1014
1015 struct nfsd4_operation {
1016         nfsd4op_func op_func;
1017         u32 op_flags;
1018         char *op_name;
1019         /*
1020          * We use the DRC for compounds containing non-idempotent
1021          * operations, *except* those that are 4.1-specific (since
1022          * sessions provide their own EOS), and except for stateful
1023          * operations other than setclientid and setclientid_confirm
1024          * (since sequence numbers provide EOS for open, lock, etc in
1025          * the v4.0 case).
1026          */
1027         bool op_cacheresult;
1028 };
1029
1030 static struct nfsd4_operation nfsd4_ops[];
1031
1032 static const char *nfsd4_op_name(unsigned opnum);
1033
1034 /*
1035  * Enforce NFSv4.1 COMPOUND ordering rules:
1036  *
1037  * Also note, enforced elsewhere:
1038  *      - SEQUENCE other than as first op results in
1039  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1040  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1041  *        (Enforced in nfsd4_bind_conn_to_session().)
1042  *      - DESTROY_SESSION must be the final operation in a compound, if
1043  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1044  *        (Enforced in nfsd4_destroy_session().)
1045  */
1046 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1047 {
1048         struct nfsd4_op *op = &args->ops[0];
1049
1050         /* These ordering requirements don't apply to NFSv4.0: */
1051         if (args->minorversion == 0)
1052                 return nfs_ok;
1053         /* This is weird, but OK, not our problem: */
1054         if (args->opcnt == 0)
1055                 return nfs_ok;
1056         if (op->status == nfserr_op_illegal)
1057                 return nfs_ok;
1058         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1059                 return nfserr_op_not_in_session;
1060         if (op->opnum == OP_SEQUENCE)
1061                 return nfs_ok;
1062         if (args->opcnt != 1)
1063                 return nfserr_not_only_op;
1064         return nfs_ok;
1065 }
1066
1067 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1068 {
1069         return &nfsd4_ops[op->opnum];
1070 }
1071
1072 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1073 {
1074         return OPDESC(op)->op_cacheresult;
1075 }
1076
1077 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1078 {
1079         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1080         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1081         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1082         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1083         struct nfsd4_operation *thisd;
1084         struct nfsd4_operation *nextd;
1085
1086         thisd = OPDESC(this);
1087         /*
1088          * Most ops check wronsec on our own; only the putfh-like ops
1089          * have special rules.
1090          */
1091         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1092                 return false;
1093         /*
1094          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1095          * put-filehandle operation if we're not going to use the
1096          * result:
1097          */
1098         if (argp->opcnt == resp->opcnt)
1099                 return false;
1100
1101         nextd = OPDESC(next);
1102         /*
1103          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1104          * errors themselves as necessary; others should check for them
1105          * now:
1106          */
1107         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1108 }
1109
1110 /*
1111  * COMPOUND call.
1112  */
1113 static __be32
1114 nfsd4_proc_compound(struct svc_rqst *rqstp,
1115                     struct nfsd4_compoundargs *args,
1116                     struct nfsd4_compoundres *resp)
1117 {
1118         struct nfsd4_op *op;
1119         struct nfsd4_operation *opdesc;
1120         struct nfsd4_compound_state *cstate = &resp->cstate;
1121         int             slack_bytes;
1122         __be32          status;
1123
1124         resp->xbuf = &rqstp->rq_res;
1125         resp->p = rqstp->rq_res.head[0].iov_base +
1126                                                 rqstp->rq_res.head[0].iov_len;
1127         resp->tagp = resp->p;
1128         /* reserve space for: taglen, tag, and opcnt */
1129         resp->p += 2 + XDR_QUADLEN(args->taglen);
1130         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1131         resp->taglen = args->taglen;
1132         resp->tag = args->tag;
1133         resp->opcnt = 0;
1134         resp->rqstp = rqstp;
1135         resp->cstate.minorversion = args->minorversion;
1136         resp->cstate.replay_owner = NULL;
1137         resp->cstate.session = NULL;
1138         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1139         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1140         /*
1141          * Don't use the deferral mechanism for NFSv4; compounds make it
1142          * too hard to avoid non-idempotency problems.
1143          */
1144         rqstp->rq_usedeferral = 0;
1145
1146         /*
1147          * According to RFC3010, this takes precedence over all other errors.
1148          */
1149         status = nfserr_minor_vers_mismatch;
1150         if (args->minorversion > nfsd_supported_minorversion)
1151                 goto out;
1152
1153         status = nfs41_check_op_ordering(args);
1154         if (status) {
1155                 op = &args->ops[0];
1156                 op->status = status;
1157                 goto encode_op;
1158         }
1159
1160         while (!status && resp->opcnt < args->opcnt) {
1161                 op = &args->ops[resp->opcnt++];
1162
1163                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1164                         resp->opcnt, args->opcnt, op->opnum,
1165                         nfsd4_op_name(op->opnum));
1166                 /*
1167                  * The XDR decode routines may have pre-set op->status;
1168                  * for example, if there is a miscellaneous XDR error
1169                  * it will be set to nfserr_bad_xdr.
1170                  */
1171                 if (op->status)
1172                         goto encode_op;
1173
1174                 /* We must be able to encode a successful response to
1175                  * this operation, with enough room left over to encode a
1176                  * failed response to the next operation.  If we don't
1177                  * have enough room, fail with ERR_RESOURCE.
1178                  */
1179                 slack_bytes = (char *)resp->end - (char *)resp->p;
1180                 if (slack_bytes < COMPOUND_SLACK_SPACE
1181                                 + COMPOUND_ERR_SLACK_SPACE) {
1182                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1183                         op->status = nfserr_resource;
1184                         goto encode_op;
1185                 }
1186
1187                 opdesc = OPDESC(op);
1188
1189                 if (!cstate->current_fh.fh_dentry) {
1190                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1191                                 op->status = nfserr_nofilehandle;
1192                                 goto encode_op;
1193                         }
1194                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1195                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1196                         op->status = nfserr_moved;
1197                         goto encode_op;
1198                 }
1199
1200                 if (opdesc->op_func)
1201                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1202                 else
1203                         BUG_ON(op->status == nfs_ok);
1204
1205                 if (!op->status && need_wrongsec_check(rqstp))
1206                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1207
1208 encode_op:
1209                 /* Only from SEQUENCE */
1210                 if (resp->cstate.status == nfserr_replay_cache) {
1211                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1212                         status = op->status;
1213                         goto out;
1214                 }
1215                 if (op->status == nfserr_replay_me) {
1216                         op->replay = &cstate->replay_owner->so_replay;
1217                         nfsd4_encode_replay(resp, op);
1218                         status = op->status = op->replay->rp_status;
1219                 } else {
1220                         nfsd4_encode_operation(resp, op);
1221                         status = op->status;
1222                 }
1223
1224                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1225                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1226                         be32_to_cpu(status));
1227
1228                 if (cstate->replay_owner) {
1229                         nfs4_unlock_state();
1230                         cstate->replay_owner = NULL;
1231                 }
1232                 /* XXX Ugh, we need to get rid of this kind of special case: */
1233                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1234                         fput(op->u.read.rd_filp);
1235
1236                 nfsd4_increment_op_stats(op->opnum);
1237         }
1238
1239         resp->cstate.status = status;
1240         fh_put(&resp->cstate.current_fh);
1241         fh_put(&resp->cstate.save_fh);
1242         BUG_ON(resp->cstate.replay_owner);
1243 out:
1244         /* Reset deferral mechanism for RPC deferrals */
1245         rqstp->rq_usedeferral = 1;
1246         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1247         return status;
1248 }
1249
1250 static struct nfsd4_operation nfsd4_ops[] = {
1251         [OP_ACCESS] = {
1252                 .op_func = (nfsd4op_func)nfsd4_access,
1253                 .op_name = "OP_ACCESS",
1254         },
1255         [OP_CLOSE] = {
1256                 .op_func = (nfsd4op_func)nfsd4_close,
1257                 .op_name = "OP_CLOSE",
1258         },
1259         [OP_COMMIT] = {
1260                 .op_func = (nfsd4op_func)nfsd4_commit,
1261                 .op_name = "OP_COMMIT",
1262         },
1263         [OP_CREATE] = {
1264                 .op_func = (nfsd4op_func)nfsd4_create,
1265                 .op_name = "OP_CREATE",
1266                 .op_cacheresult = true,
1267         },
1268         [OP_DELEGRETURN] = {
1269                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1270                 .op_name = "OP_DELEGRETURN",
1271         },
1272         [OP_GETATTR] = {
1273                 .op_func = (nfsd4op_func)nfsd4_getattr,
1274                 .op_flags = ALLOWED_ON_ABSENT_FS,
1275                 .op_name = "OP_GETATTR",
1276         },
1277         [OP_GETFH] = {
1278                 .op_func = (nfsd4op_func)nfsd4_getfh,
1279                 .op_name = "OP_GETFH",
1280         },
1281         [OP_LINK] = {
1282                 .op_func = (nfsd4op_func)nfsd4_link,
1283                 .op_name = "OP_LINK",
1284                 .op_cacheresult = true,
1285         },
1286         [OP_LOCK] = {
1287                 .op_func = (nfsd4op_func)nfsd4_lock,
1288                 .op_name = "OP_LOCK",
1289         },
1290         [OP_LOCKT] = {
1291                 .op_func = (nfsd4op_func)nfsd4_lockt,
1292                 .op_name = "OP_LOCKT",
1293         },
1294         [OP_LOCKU] = {
1295                 .op_func = (nfsd4op_func)nfsd4_locku,
1296                 .op_name = "OP_LOCKU",
1297         },
1298         [OP_LOOKUP] = {
1299                 .op_func = (nfsd4op_func)nfsd4_lookup,
1300                 .op_flags = OP_HANDLES_WRONGSEC,
1301                 .op_name = "OP_LOOKUP",
1302         },
1303         [OP_LOOKUPP] = {
1304                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1305                 .op_flags = OP_HANDLES_WRONGSEC,
1306                 .op_name = "OP_LOOKUPP",
1307         },
1308         [OP_NVERIFY] = {
1309                 .op_func = (nfsd4op_func)nfsd4_nverify,
1310                 .op_name = "OP_NVERIFY",
1311         },
1312         [OP_OPEN] = {
1313                 .op_func = (nfsd4op_func)nfsd4_open,
1314                 .op_flags = OP_HANDLES_WRONGSEC,
1315                 .op_name = "OP_OPEN",
1316         },
1317         [OP_OPEN_CONFIRM] = {
1318                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1319                 .op_name = "OP_OPEN_CONFIRM",
1320         },
1321         [OP_OPEN_DOWNGRADE] = {
1322                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1323                 .op_name = "OP_OPEN_DOWNGRADE",
1324         },
1325         [OP_PUTFH] = {
1326                 .op_func = (nfsd4op_func)nfsd4_putfh,
1327                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1328                                 | OP_IS_PUTFH_LIKE,
1329                 .op_name = "OP_PUTFH",
1330         },
1331         [OP_PUTPUBFH] = {
1332                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1333                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1334                                 | OP_IS_PUTFH_LIKE,
1335                 .op_name = "OP_PUTPUBFH",
1336         },
1337         [OP_PUTROOTFH] = {
1338                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1339                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1340                                 | OP_IS_PUTFH_LIKE,
1341                 .op_name = "OP_PUTROOTFH",
1342         },
1343         [OP_READ] = {
1344                 .op_func = (nfsd4op_func)nfsd4_read,
1345                 .op_name = "OP_READ",
1346         },
1347         [OP_READDIR] = {
1348                 .op_func = (nfsd4op_func)nfsd4_readdir,
1349                 .op_name = "OP_READDIR",
1350         },
1351         [OP_READLINK] = {
1352                 .op_func = (nfsd4op_func)nfsd4_readlink,
1353                 .op_name = "OP_READLINK",
1354         },
1355         [OP_REMOVE] = {
1356                 .op_func = (nfsd4op_func)nfsd4_remove,
1357                 .op_name = "OP_REMOVE",
1358                 .op_cacheresult = true,
1359         },
1360         [OP_RENAME] = {
1361                 .op_name = "OP_RENAME",
1362                 .op_func = (nfsd4op_func)nfsd4_rename,
1363                 .op_cacheresult = true,
1364         },
1365         [OP_RENEW] = {
1366                 .op_func = (nfsd4op_func)nfsd4_renew,
1367                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1368                 .op_name = "OP_RENEW",
1369         },
1370         [OP_RESTOREFH] = {
1371                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1372                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1373                                 | OP_IS_PUTFH_LIKE,
1374                 .op_name = "OP_RESTOREFH",
1375         },
1376         [OP_SAVEFH] = {
1377                 .op_func = (nfsd4op_func)nfsd4_savefh,
1378                 .op_flags = OP_HANDLES_WRONGSEC,
1379                 .op_name = "OP_SAVEFH",
1380         },
1381         [OP_SECINFO] = {
1382                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1383                 .op_flags = OP_HANDLES_WRONGSEC,
1384                 .op_name = "OP_SECINFO",
1385         },
1386         [OP_SETATTR] = {
1387                 .op_func = (nfsd4op_func)nfsd4_setattr,
1388                 .op_name = "OP_SETATTR",
1389                 .op_cacheresult = true,
1390         },
1391         [OP_SETCLIENTID] = {
1392                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1393                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1394                 .op_name = "OP_SETCLIENTID",
1395                 .op_cacheresult = true,
1396         },
1397         [OP_SETCLIENTID_CONFIRM] = {
1398                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1399                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1400                 .op_name = "OP_SETCLIENTID_CONFIRM",
1401                 .op_cacheresult = true,
1402         },
1403         [OP_VERIFY] = {
1404                 .op_func = (nfsd4op_func)nfsd4_verify,
1405                 .op_name = "OP_VERIFY",
1406         },
1407         [OP_WRITE] = {
1408                 .op_func = (nfsd4op_func)nfsd4_write,
1409                 .op_name = "OP_WRITE",
1410                 .op_cacheresult = true,
1411         },
1412         [OP_RELEASE_LOCKOWNER] = {
1413                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1414                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1415                 .op_name = "OP_RELEASE_LOCKOWNER",
1416         },
1417
1418         /* NFSv4.1 operations */
1419         [OP_EXCHANGE_ID] = {
1420                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1421                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1422                 .op_name = "OP_EXCHANGE_ID",
1423         },
1424         [OP_BIND_CONN_TO_SESSION] = {
1425                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1426                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1427                 .op_name = "OP_BIND_CONN_TO_SESSION",
1428         },
1429         [OP_CREATE_SESSION] = {
1430                 .op_func = (nfsd4op_func)nfsd4_create_session,
1431                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1432                 .op_name = "OP_CREATE_SESSION",
1433         },
1434         [OP_DESTROY_SESSION] = {
1435                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1436                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1437                 .op_name = "OP_DESTROY_SESSION",
1438         },
1439         [OP_SEQUENCE] = {
1440                 .op_func = (nfsd4op_func)nfsd4_sequence,
1441                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1442                 .op_name = "OP_SEQUENCE",
1443         },
1444         [OP_DESTROY_CLIENTID] = {
1445                 .op_func = NULL,
1446                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1447                 .op_name = "OP_DESTROY_CLIENTID",
1448         },
1449         [OP_RECLAIM_COMPLETE] = {
1450                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1451                 .op_flags = ALLOWED_WITHOUT_FH,
1452                 .op_name = "OP_RECLAIM_COMPLETE",
1453         },
1454         [OP_SECINFO_NO_NAME] = {
1455                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1456                 .op_flags = OP_HANDLES_WRONGSEC,
1457                 .op_name = "OP_SECINFO_NO_NAME",
1458         },
1459         [OP_TEST_STATEID] = {
1460                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1461                 .op_flags = ALLOWED_WITHOUT_FH,
1462                 .op_name = "OP_TEST_STATEID",
1463         },
1464         [OP_FREE_STATEID] = {
1465                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1466                 .op_flags = ALLOWED_WITHOUT_FH,
1467                 .op_name = "OP_FREE_STATEID",
1468         },
1469 };
1470
1471 static const char *nfsd4_op_name(unsigned opnum)
1472 {
1473         if (opnum < ARRAY_SIZE(nfsd4_ops))
1474                 return nfsd4_ops[opnum].op_name;
1475         return "unknown_operation";
1476 }
1477
1478 #define nfsd4_voidres                   nfsd4_voidargs
1479 struct nfsd4_voidargs { int dummy; };
1480
1481 static struct svc_procedure             nfsd_procedures4[2] = {
1482         [NFSPROC4_NULL] = {
1483                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1484                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1485                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1486                 .pc_ressize = sizeof(struct nfsd4_voidres),
1487                 .pc_cachetype = RC_NOCACHE,
1488                 .pc_xdrressize = 1,
1489         },
1490         [NFSPROC4_COMPOUND] = {
1491                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1492                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1493                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1494                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1495                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1496                 .pc_release = nfsd4_release_compoundargs,
1497                 .pc_cachetype = RC_NOCACHE,
1498                 .pc_xdrressize = NFSD_BUFSIZE/4,
1499         },
1500 };
1501
1502 struct svc_version      nfsd_version4 = {
1503                 .vs_vers        = 4,
1504                 .vs_nproc       = 2,
1505                 .vs_proc        = nfsd_procedures4,
1506                 .vs_dispatch    = nfsd_dispatch,
1507                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1508 };
1509
1510 /*
1511  * Local variables:
1512  *  c-basic-offset: 8
1513  * End:
1514  */