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         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 160                 accmode |= NFSD_MAY_READ;
 161         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 162                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 163         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 164                 accmode |= NFSD_MAY_WRITE;
 165
 166         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 167
 168         return status;
 169 }
 170
 171 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 172 {
 173         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 174
 175         if (S_ISREG(mode))
 176                 return nfs_ok;
 177         if (S_ISDIR(mode))
 178                 return nfserr_isdir;
 179         /*
 180          * Using err_symlink as our catch-all case may look odd; but
 181          * there's no other obvious error for this case in 4.0, and we
 182          * happen to know that it will cause the linux v4 client to do
 183          * the right thing on attempts to open something other than a
 184          * regular file.
 185          */
 186         return nfserr_symlink;
 187 }
 188
 189 static __be32
 190 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 191 {
 192         struct svc_fh resfh;
 193         __be32 status;
 194         int created = 0;
 195
 196         fh_init(&resfh, NFS4_FHSIZE);
 197         open->op_truncate = 0;
 198
 199         if (open->op_create) {
 200                 /* FIXME: check session persistence and pnfs flags.
 201                  * The nfsv4.1 spec requires the following semantics:
 202                  *
 203                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 204                  * Reply Cache  | server |                 |
 205                  * -------------+--------+-----------------+--------------------
 206                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 207                  *              |        |                 | (SHOULD)
 208                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 209                  *              |        |                 | (SHOULD NOT)
 210                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 211                  * yes          | no     | GUARDED4        | GUARDED4
 212                  * yes          | yes    | GUARDED4        | GUARDED4
 213                  */
 214
 215                 /*
 216                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 217                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 218                  */
 219                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 220                                         open->op_fname.len, &open->op_iattr,
 221                                         &resfh, open->op_createmode,
 222                                         (u32 *)open->op_verf.data,
 223                                         &open->op_truncate, &created);
 224
 225                 /*
 226                  * Following rfc 3530 14.2.16, use the returned bitmask
 227                  * to indicate which attributes we used to store the
 228                  * verifier:
 229                  */
 230                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 231                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 232                                                 FATTR4_WORD1_TIME_MODIFY);
 233         } else {
 234                 status = nfsd_lookup(rqstp, current_fh,
 235                                      open->op_fname.data, open->op_fname.len, &resfh);
 236                 fh_unlock(current_fh);
 237                 if (status)
 238                         goto out;
 239                 status = nfsd_check_obj_isreg(&resfh);
 240         }
 241         if (status)
 242                 goto out;
 243
 244         if (is_create_with_attrs(open) && open->op_acl != NULL)
 245                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 246
 247         set_change_info(&open->op_cinfo, current_fh);
 248         fh_dup2(current_fh, &resfh);
 249
 250         /* set reply cache */
 251         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 252                         &resfh.fh_handle);
 253         if (!created)
 254                 status = do_open_permission(rqstp, current_fh, open,
 255                                             NFSD_MAY_NOP);
 256
 257 out:
 258         fh_put(&resfh);
 259         return status;
 260 }
 261
 262 static __be32
 263 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 264 {
 265         __be32 status;
 266
 267         /* Only reclaims from previously confirmed clients are valid */
 268         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 269                 return status;
 270
 271         /* We don't know the target directory, and therefore can not
 272         * set the change info
 273         */
 274
 275         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 276
 277         /* set replay cache */
 278         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 279                         &current_fh->fh_handle);
 280
 281         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 282                 (open->op_iattr.ia_size == 0);
 283
 284         status = do_open_permission(rqstp, current_fh, open,
 285                                     NFSD_MAY_OWNER_OVERRIDE);
 286
 287         return status;
 288 }
 289
 290 static void
 291 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 292 {
 293         struct nfsd4_sessionid *sid =
 294                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 295
 296         clid->cl_boot = sid->clientid.cl_boot;
 297         clid->cl_id = sid->clientid.cl_id;
 298 }
 299
 300 static __be32
 301 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 302            struct nfsd4_open *open)
 303 {
 304         __be32 status;
 305         struct nfsd4_compoundres *resp;
 306
 307         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 308                 (int)open->op_fname.len, open->op_fname.data,
 309                 open->op_stateowner);
 310
 311         /* This check required by spec. */
 312         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 313                 return nfserr_inval;
 314
 315         /*
 316          * RFC5661 18.51.3
 317          * Before RECLAIM_COMPLETE done, server should deny new lock
 318          */
 319         if (nfsd4_has_session(cstate) &&
 320             !cstate->session->se_client->cl_firststate &&
 321             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 322                 return nfserr_grace;
 323
 324         if (nfsd4_has_session(cstate))
 325                 copy_clientid(&open->op_clientid, cstate->session);
 326
 327         nfs4_lock_state();
 328
 329         /* check seqid for replay. set nfs4_owner */
 330         resp = rqstp->rq_resp;
 331         status = nfsd4_process_open1(&resp->cstate, open);
 332         if (status == nfserr_replay_me) {
 333                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 334                 fh_put(&cstate->current_fh);
 335                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 336                                 &rp->rp_openfh);
 337                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 338                 if (status)
 339                         dprintk("nfsd4_open: replay failed"
 340                                 " restoring previous filehandle\n");
 341                 else
 342                         status = nfserr_replay_me;
 343         }
 344         if (status)
 345                 goto out;
 346
 347         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 348         if (status)
 349                 goto out;
 350
 351         /* Openowner is now set, so sequence id will get bumped.  Now we need
 352          * these checks before we do any creates: */
 353         status = nfserr_grace;
 354         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 355                 goto out;
 356         status = nfserr_no_grace;
 357         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 358                 goto out;
 359
 360         switch (open->op_claim_type) {
 361                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 362                 case NFS4_OPEN_CLAIM_NULL:
 363                         /*
 364                          * (1) set CURRENT_FH to the file being opened,
 365                          * creating it if necessary, (2) set open->op_cinfo,
 366                          * (3) set open->op_truncate if the file is to be
 367                          * truncated after opening, (4) do permission checking.
 368                          */
 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_stateowner->so_confirmed = 1;
 376                         /*
 377                          * The CURRENT_FH is already set to the file being
 378                          * opened.  (1) set open->op_cinfo, (2) set
 379                          * open->op_truncate if the file is to be truncated
 380                          * after opening, (3) do permission checking.
 381                         */
 382                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 383                                                  open);
 384                         if (status)
 385                                 goto out;
 386                         break;
 387                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 388                         open->op_stateowner->so_confirmed = 1;
 389                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 390                                 open->op_claim_type);
 391                         status = nfserr_notsupp;
 392                         goto out;
 393                 default:
 394                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 395                                 open->op_claim_type);
 396                         status = nfserr_inval;
 397                         goto out;
 398         }
 399         /*
 400          * nfsd4_process_open2() does the actual opening of the file.  If
 401          * successful, it (1) truncates the file if open->op_truncate was
 402          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 403          */
 404         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 405 out:
 406         if (open->op_stateowner) {
 407                 nfs4_get_stateowner(open->op_stateowner);
 408                 cstate->replay_owner = open->op_stateowner;
 409         }
 410         nfs4_unlock_state();
 411         return status;
 412 }
 413
 414 /*
 415  * filehandle-manipulating ops.
 416  */
 417 static __be32
 418 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 419             struct svc_fh **getfh)
 420 {
 421         if (!cstate->current_fh.fh_dentry)
 422                 return nfserr_nofilehandle;
 423
 424         *getfh = &cstate->current_fh;
 425         return nfs_ok;
 426 }
 427
 428 static __be32
 429 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 430             struct nfsd4_putfh *putfh)
 431 {
 432         fh_put(&cstate->current_fh);
 433         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 434         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 435                putfh->pf_fhlen);
 436         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 437 }
 438
 439 static __be32
 440 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 441                 void *arg)
 442 {
 443         __be32 status;
 444
 445         fh_put(&cstate->current_fh);
 446         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 447         return status;
 448 }
 449
 450 static __be32
 451 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 452                 void *arg)
 453 {
 454         if (!cstate->save_fh.fh_dentry)
 455                 return nfserr_restorefh;
 456
 457         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 458         return nfs_ok;
 459 }
 460
 461 static __be32
 462 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 463              void *arg)
 464 {
 465         if (!cstate->current_fh.fh_dentry)
 466                 return nfserr_nofilehandle;
 467
 468         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 469         return nfs_ok;
 470 }
 471
 472 /*
 473  * misc nfsv4 ops
 474  */
 475 static __be32
 476 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 477              struct nfsd4_access *access)
 478 {
 479         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 480                 return nfserr_inval;
 481
 482         access->ac_resp_access = access->ac_req_access;
 483         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 484                            &access->ac_supported);
 485 }
 486
 487 static __be32
 488 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 489              struct nfsd4_commit *commit)
 490 {
 491         u32 *p = (u32 *)commit->co_verf.data;
 492         *p++ = nfssvc_boot.tv_sec;
 493         *p++ = nfssvc_boot.tv_usec;
 494
 495         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 496                              commit->co_count);
 497 }
 498
 499 static __be32
 500 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 501              struct nfsd4_create *create)
 502 {
 503         struct svc_fh resfh;
 504         __be32 status;
 505         dev_t rdev;
 506
 507         fh_init(&resfh, NFS4_FHSIZE);
 508
 509         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 510                            NFSD_MAY_CREATE);
 511         if (status)
 512                 return status;
 513
 514         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 515                                     nfsd_attrmask);
 516         if (status)
 517                 return status;
 518
 519         switch (create->cr_type) {
 520         case NF4LNK:
 521                 /* ugh! we have to null-terminate the linktext, or
 522                  * vfs_symlink() will choke.  it is always safe to
 523                  * null-terminate by brute force, since at worst we
 524                  * will overwrite the first byte of the create namelen
 525                  * in the XDR buffer, which has already been extracted
 526                  * during XDR decode.
 527                  */
 528                 create->cr_linkname[create->cr_linklen] = 0;
 529
 530                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 531                                       create->cr_name, create->cr_namelen,
 532                                       create->cr_linkname, create->cr_linklen,
 533                                       &resfh, &create->cr_iattr);
 534                 break;
 535
 536         case NF4BLK:
 537                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 538                 if (MAJOR(rdev) != create->cr_specdata1 ||
 539                     MINOR(rdev) != create->cr_specdata2)
 540                         return nfserr_inval;
 541                 status = nfsd_create(rqstp, &cstate->current_fh,
 542                                      create->cr_name, create->cr_namelen,
 543                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 544                 break;
 545
 546         case NF4CHR:
 547                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 548                 if (MAJOR(rdev) != create->cr_specdata1 ||
 549                     MINOR(rdev) != create->cr_specdata2)
 550                         return nfserr_inval;
 551                 status = nfsd_create(rqstp, &cstate->current_fh,
 552                                      create->cr_name, create->cr_namelen,
 553                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 554                 break;
 555
 556         case NF4SOCK:
 557                 status = nfsd_create(rqstp, &cstate->current_fh,
 558                                      create->cr_name, create->cr_namelen,
 559                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 560                 break;
 561
 562         case NF4FIFO:
 563                 status = nfsd_create(rqstp, &cstate->current_fh,
 564                                      create->cr_name, create->cr_namelen,
 565                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 566                 break;
 567
 568         case NF4DIR:
 569                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 570                 status = nfsd_create(rqstp, &cstate->current_fh,
 571                                      create->cr_name, create->cr_namelen,
 572                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 573                 break;
 574
 575         default:
 576                 status = nfserr_badtype;
 577         }
 578
 579         if (status)
 580                 goto out;
 581
 582         if (create->cr_acl != NULL)
 583                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 584                                 create->cr_bmval);
 585
 586         fh_unlock(&cstate->current_fh);
 587         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 588         fh_dup2(&cstate->current_fh, &resfh);
 589 out:
 590         fh_put(&resfh);
 591         return status;
 592 }
 593
 594 static __be32
 595 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 596               struct nfsd4_getattr *getattr)
 597 {
 598         __be32 status;
 599
 600         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 601         if (status)
 602                 return status;
 603
 604         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 605                 return nfserr_inval;
 606
 607         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 608         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 609         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 610
 611         getattr->ga_fhp = &cstate->current_fh;
 612         return nfs_ok;
 613 }
 614
 615 static __be32
 616 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 617            struct nfsd4_link *link)
 618 {
 619         __be32 status = nfserr_nofilehandle;
 620
 621         if (!cstate->save_fh.fh_dentry)
 622                 return status;
 623         status = nfsd_link(rqstp, &cstate->current_fh,
 624                            link->li_name, link->li_namelen, &cstate->save_fh);
 625         if (!status)
 626                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 627         return status;
 628 }
 629
 630 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 631 {
 632         struct svc_fh tmp_fh;
 633         __be32 ret;
 634
 635         fh_init(&tmp_fh, NFS4_FHSIZE);
 636         ret = exp_pseudoroot(rqstp, &tmp_fh);
 637         if (ret)
 638                 return ret;
 639         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 640                 fh_put(&tmp_fh);
 641                 return nfserr_noent;
 642         }
 643         fh_put(&tmp_fh);
 644         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 645 }
 646
 647 static __be32
 648 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 649               void *arg)
 650 {
 651         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 652 }
 653
 654 static __be32
 655 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 656              struct nfsd4_lookup *lookup)
 657 {
 658         return nfsd_lookup(rqstp, &cstate->current_fh,
 659                            lookup->lo_name, lookup->lo_len,
 660                            &cstate->current_fh);
 661 }
 662
 663 static __be32
 664 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 665            struct nfsd4_read *read)
 666 {
 667         __be32 status;
 668
 669         /* no need to check permission - this will be done in nfsd_read() */
 670
 671         read->rd_filp = NULL;
 672         if (read->rd_offset >= OFFSET_MAX)
 673                 return nfserr_inval;
 674
 675         nfs4_lock_state();
 676         /* check stateid */
 677         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 678                                                  RD_STATE, &read->rd_filp))) {
 679                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 680                 goto out;
 681         }
 682         if (read->rd_filp)
 683                 get_file(read->rd_filp);
 684         status = nfs_ok;
 685 out:
 686         nfs4_unlock_state();
 687         read->rd_rqstp = rqstp;
 688         read->rd_fhp = &cstate->current_fh;
 689         return status;
 690 }
 691
 692 static __be32
 693 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 694               struct nfsd4_readdir *readdir)
 695 {
 696         u64 cookie = readdir->rd_cookie;
 697         static const nfs4_verifier zeroverf;
 698
 699         /* no need to check permission - this will be done in nfsd_readdir() */
 700
 701         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 702                 return nfserr_inval;
 703
 704         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 705         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 706         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 707
 708         if ((cookie == 1) || (cookie == 2) ||
 709             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 710                 return nfserr_bad_cookie;
 711
 712         readdir->rd_rqstp = rqstp;
 713         readdir->rd_fhp = &cstate->current_fh;
 714         return nfs_ok;
 715 }
 716
 717 static __be32
 718 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 719                struct nfsd4_readlink *readlink)
 720 {
 721         readlink->rl_rqstp = rqstp;
 722         readlink->rl_fhp = &cstate->current_fh;
 723         return nfs_ok;
 724 }
 725
 726 static __be32
 727 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 728              struct nfsd4_remove *remove)
 729 {
 730         __be32 status;
 731
 732         if (locks_in_grace())
 733                 return nfserr_grace;
 734         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 735                              remove->rm_name, remove->rm_namelen);
 736         if (!status) {
 737                 fh_unlock(&cstate->current_fh);
 738                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 739         }
 740         return status;
 741 }
 742
 743 static __be32
 744 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 745              struct nfsd4_rename *rename)
 746 {
 747         __be32 status = nfserr_nofilehandle;
 748
 749         if (!cstate->save_fh.fh_dentry)
 750                 return status;
 751         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 752                                         & NFSEXP_NOSUBTREECHECK))
 753                 return nfserr_grace;
 754         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 755                              rename->rn_snamelen, &cstate->current_fh,
 756                              rename->rn_tname, rename->rn_tnamelen);
 757
 758         /* the underlying filesystem returns different error's than required
 759          * by NFSv4. both save_fh and current_fh have been verified.. */
 760         if (status == nfserr_isdir)
 761                 status = nfserr_exist;
 762         else if ((status == nfserr_notdir) &&
 763                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 764                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 765                 status = nfserr_exist;
 766
 767         if (!status) {
 768                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 769                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 770         }
 771         return status;
 772 }
 773
 774 static __be32
 775 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 776               struct nfsd4_secinfo *secinfo)
 777 {
 778         struct svc_fh resfh;
 779         struct svc_export *exp;
 780         struct dentry *dentry;
 781         __be32 err;
 782
 783         fh_init(&resfh, NFS4_FHSIZE);
 784         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 785         if (err)
 786                 return err;
 787         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 788                                     secinfo->si_name, secinfo->si_namelen,
 789                                     &exp, &dentry);
 790         if (err)
 791                 return err;
 792         if (dentry->d_inode == NULL) {
 793                 exp_put(exp);
 794                 err = nfserr_noent;
 795         } else
 796                 secinfo->si_exp = exp;
 797         dput(dentry);
 798         if (cstate->minorversion)
 799                 /* See rfc 5661 section 2.6.3.1.1.8 */
 800                 fh_put(&cstate->current_fh);
 801         return err;
 802 }
 803
 804 static __be32
 805 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 806               struct nfsd4_secinfo_no_name *sin)
 807 {
 808         __be32 err;
 809
 810         switch (sin->sin_style) {
 811         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 812                 break;
 813         case NFS4_SECINFO_STYLE4_PARENT:
 814                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 815                 if (err)
 816                         return err;
 817                 break;
 818         default:
 819                 return nfserr_inval;
 820         }
 821         exp_get(cstate->current_fh.fh_export);
 822         sin->sin_exp = cstate->current_fh.fh_export;
 823         fh_put(&cstate->current_fh);
 824         return nfs_ok;
 825 }
 826
 827 static __be32
 828 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 829               struct nfsd4_setattr *setattr)
 830 {
 831         __be32 status = nfs_ok;
 832
 833         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 834                 nfs4_lock_state();
 835                 status = nfs4_preprocess_stateid_op(cstate,
 836                         &setattr->sa_stateid, WR_STATE, NULL);
 837                 nfs4_unlock_state();
 838                 if (status) {
 839                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 840                         return status;
 841                 }
 842         }
 843         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 844         if (status)
 845                 return status;
 846         status = nfs_ok;
 847
 848         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 849                                     nfsd_attrmask);
 850         if (status)
 851                 goto out;
 852
 853         if (setattr->sa_acl != NULL)
 854                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 855                                             setattr->sa_acl);
 856         if (status)
 857                 goto out;
 858         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 859                                 0, (time_t)0);
 860 out:
 861         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 862         return status;
 863 }
 864
 865 static __be32
 866 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 867             struct nfsd4_write *write)
 868 {
 869         stateid_t *stateid = &write->wr_stateid;
 870         struct file *filp = NULL;
 871         u32 *p;
 872         __be32 status = nfs_ok;
 873         unsigned long cnt;
 874
 875         /* no need to check permission - this will be done in nfsd_write() */
 876
 877         if (write->wr_offset >= OFFSET_MAX)
 878                 return nfserr_inval;
 879
 880         nfs4_lock_state();
 881         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 882         if (filp)
 883                 get_file(filp);
 884         nfs4_unlock_state();
 885
 886         if (status) {
 887                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 888                 return status;
 889         }
 890
 891         cnt = write->wr_buflen;
 892         write->wr_how_written = write->wr_stable_how;
 893         p = (u32 *)write->wr_verifier.data;
 894         *p++ = nfssvc_boot.tv_sec;
 895         *p++ = nfssvc_boot.tv_usec;
 896
 897         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 898                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 899                              &cnt, &write->wr_how_written);
 900         if (filp)
 901                 fput(filp);
 902
 903         write->wr_bytes_written = cnt;
 904
 905         return status;
 906 }
 907
 908 /* This routine never returns NFS_OK!  If there are no other errors, it
 909  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 910  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 911  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 912  */
 913 static __be32
 914 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 915              struct nfsd4_verify *verify)
 916 {
 917         __be32 *buf, *p;
 918         int count;
 919         __be32 status;
 920
 921         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 922         if (status)
 923                 return status;
 924
 925         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 926         if (status)
 927                 return status;
 928
 929         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 930             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 931                 return nfserr_inval;
 932         if (verify->ve_attrlen & 3)
 933                 return nfserr_inval;
 934
 935         /* count in words:
 936          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 937          */
 938         count = 4 + (verify->ve_attrlen >> 2);
 939         buf = kmalloc(count << 2, GFP_KERNEL);
 940         if (!buf)
 941                 return nfserr_resource;
 942
 943         status = nfsd4_encode_fattr(&cstate->current_fh,
 944                                     cstate->current_fh.fh_export,
 945                                     cstate->current_fh.fh_dentry, buf,
 946                                     &count, verify->ve_bmval,
 947                                     rqstp, 0);
 948
 949         /* this means that nfsd4_encode_fattr() ran out of space */
 950         if (status == nfserr_resource && count == 0)
 951                 status = nfserr_not_same;
 952         if (status)
 953                 goto out_kfree;
 954
 955         /* skip bitmap */
 956         p = buf + 1 + ntohl(buf[0]);
 957         status = nfserr_not_same;
 958         if (ntohl(*p++) != verify->ve_attrlen)
 959                 goto out_kfree;
 960         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 961                 status = nfserr_same;
 962
 963 out_kfree:
 964         kfree(buf);
 965         return status;
 966 }
 967
 968 static __be32
 969 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 970               struct nfsd4_verify *verify)
 971 {
 972         __be32 status;
 973
 974         status = _nfsd4_verify(rqstp, cstate, verify);
 975         return status == nfserr_not_same ? nfs_ok : status;
 976 }
 977
 978 static __be32
 979 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 980              struct nfsd4_verify *verify)
 981 {
 982         __be32 status;
 983
 984         status = _nfsd4_verify(rqstp, cstate, verify);
 985         return status == nfserr_same ? nfs_ok : status;
 986 }
 987
 988 /*
 989  * NULL call.
 990  */
 991 static __be32
 992 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 993 {
 994         return nfs_ok;
 995 }
 996
 997 static inline void nfsd4_increment_op_stats(u32 opnum)
 998 {
 999         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1000                 nfsdstats.nfs4_opcount[opnum]++;
1001 }
1002
1003 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1004                               void *);
1005 enum nfsd4_op_flags {
1006         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1007         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1008         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1009         /* For rfc 5661 section 2.6.3.1.1: */
1010         OP_HANDLES_WRONGSEC = 1 << 3,
1011         OP_IS_PUTFH_LIKE = 1 << 4,
1012 };
1013
1014 struct nfsd4_operation {
1015         nfsd4op_func op_func;
1016         u32 op_flags;
1017         char *op_name;
1018         /*
1019          * We use the DRC for compounds containing non-idempotent
1020          * operations, *except* those that are 4.1-specific (since
1021          * sessions provide their own EOS), and except for stateful
1022          * operations other than setclientid and setclientid_confirm
1023          * (since sequence numbers provide EOS for open, lock, etc in
1024          * the v4.0 case).
1025          */
1026         bool op_cacheresult;
1027 };
1028
1029 static struct nfsd4_operation nfsd4_ops[];
1030
1031 static const char *nfsd4_op_name(unsigned opnum);
1032
1033 /*
1034  * Enforce NFSv4.1 COMPOUND ordering rules:
1035  *
1036  * Also note, enforced elsewhere:
1037  *      - SEQUENCE other than as first op results in
1038  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1039  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1040  *        (Enforced in nfsd4_bind_conn_to_session().)
1041  *      - DESTROY_SESSION must be the final operation in a compound, if
1042  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1043  *        (Enforced in nfsd4_destroy_session().)
1044  */
1045 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1046 {
1047         struct nfsd4_op *op = &args->ops[0];
1048
1049         /* These ordering requirements don't apply to NFSv4.0: */
1050         if (args->minorversion == 0)
1051                 return nfs_ok;
1052         /* This is weird, but OK, not our problem: */
1053         if (args->opcnt == 0)
1054                 return nfs_ok;
1055         if (op->status == nfserr_op_illegal)
1056                 return nfs_ok;
1057         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1058                 return nfserr_op_not_in_session;
1059         if (op->opnum == OP_SEQUENCE)
1060                 return nfs_ok;
1061         if (args->opcnt != 1)
1062                 return nfserr_not_only_op;
1063         return nfs_ok;
1064 }
1065
1066 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1067 {
1068         return &nfsd4_ops[op->opnum];
1069 }
1070
1071 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1072 {
1073         return OPDESC(op)->op_cacheresult;
1074 }
1075
1076 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1077 {
1078         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1079         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1080         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1081         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1082         struct nfsd4_operation *thisd;
1083         struct nfsd4_operation *nextd;
1084
1085         thisd = OPDESC(this);
1086         /*
1087          * Most ops check wronsec on our own; only the putfh-like ops
1088          * have special rules.
1089          */
1090         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1091                 return false;
1092         /*
1093          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1094          * put-filehandle operation if we're not going to use the
1095          * result:
1096          */
1097         if (argp->opcnt == resp->opcnt)
1098                 return false;
1099
1100         nextd = OPDESC(next);
1101         /*
1102          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1103          * errors themselves as necessary; others should check for them
1104          * now:
1105          */
1106         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1107 }
1108
1109 /*
1110  * COMPOUND call.
1111  */
1112 static __be32
1113 nfsd4_proc_compound(struct svc_rqst *rqstp,
1114                     struct nfsd4_compoundargs *args,
1115                     struct nfsd4_compoundres *resp)
1116 {
1117         struct nfsd4_op *op;
1118         struct nfsd4_operation *opdesc;
1119         struct nfsd4_compound_state *cstate = &resp->cstate;
1120         int             slack_bytes;
1121         __be32          status;
1122
1123         resp->xbuf = &rqstp->rq_res;
1124         resp->p = rqstp->rq_res.head[0].iov_base +
1125                                                 rqstp->rq_res.head[0].iov_len;
1126         resp->tagp = resp->p;
1127         /* reserve space for: taglen, tag, and opcnt */
1128         resp->p += 2 + XDR_QUADLEN(args->taglen);
1129         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1130         resp->taglen = args->taglen;
1131         resp->tag = args->tag;
1132         resp->opcnt = 0;
1133         resp->rqstp = rqstp;
1134         resp->cstate.minorversion = args->minorversion;
1135         resp->cstate.replay_owner = NULL;
1136         resp->cstate.session = NULL;
1137         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1138         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1139         /*
1140          * Don't use the deferral mechanism for NFSv4; compounds make it
1141          * too hard to avoid non-idempotency problems.
1142          */
1143         rqstp->rq_usedeferral = 0;
1144
1145         /*
1146          * According to RFC3010, this takes precedence over all other errors.
1147          */
1148         status = nfserr_minor_vers_mismatch;
1149         if (args->minorversion > nfsd_supported_minorversion)
1150                 goto out;
1151
1152         status = nfs41_check_op_ordering(args);
1153         if (status) {
1154                 op = &args->ops[0];
1155                 op->status = status;
1156                 goto encode_op;
1157         }
1158
1159         while (!status && resp->opcnt < args->opcnt) {
1160                 op = &args->ops[resp->opcnt++];
1161
1162                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1163                         resp->opcnt, args->opcnt, op->opnum,
1164                         nfsd4_op_name(op->opnum));
1165                 /*
1166                  * The XDR decode routines may have pre-set op->status;
1167                  * for example, if there is a miscellaneous XDR error
1168                  * it will be set to nfserr_bad_xdr.
1169                  */
1170                 if (op->status)
1171                         goto encode_op;
1172
1173                 /* We must be able to encode a successful response to
1174                  * this operation, with enough room left over to encode a
1175                  * failed response to the next operation.  If we don't
1176                  * have enough room, fail with ERR_RESOURCE.
1177                  */
1178                 slack_bytes = (char *)resp->end - (char *)resp->p;
1179                 if (slack_bytes < COMPOUND_SLACK_SPACE
1180                                 + COMPOUND_ERR_SLACK_SPACE) {
1181                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1182                         op->status = nfserr_resource;
1183                         goto encode_op;
1184                 }
1185
1186                 opdesc = OPDESC(op);
1187
1188                 if (!cstate->current_fh.fh_dentry) {
1189                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1190                                 op->status = nfserr_nofilehandle;
1191                                 goto encode_op;
1192                         }
1193                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1194                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1195                         op->status = nfserr_moved;
1196                         goto encode_op;
1197                 }
1198
1199                 if (opdesc->op_func)
1200                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1201                 else
1202                         BUG_ON(op->status == nfs_ok);
1203
1204                 if (!op->status && need_wrongsec_check(rqstp))
1205                         op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1206
1207 encode_op:
1208                 /* Only from SEQUENCE */
1209                 if (resp->cstate.status == nfserr_replay_cache) {
1210                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1211                         status = op->status;
1212                         goto out;
1213                 }
1214                 if (op->status == nfserr_replay_me) {
1215                         op->replay = &cstate->replay_owner->so_replay;
1216                         nfsd4_encode_replay(resp, op);
1217                         status = op->status = op->replay->rp_status;
1218                 } else {
1219                         nfsd4_encode_operation(resp, op);
1220                         status = op->status;
1221                 }
1222
1223                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1224                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1225                         be32_to_cpu(status));
1226
1227                 if (cstate->replay_owner) {
1228                         nfs4_put_stateowner(cstate->replay_owner);
1229                         cstate->replay_owner = NULL;
1230                 }
1231                 /* XXX Ugh, we need to get rid of this kind of special case: */
1232                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1233                         fput(op->u.read.rd_filp);
1234
1235                 nfsd4_increment_op_stats(op->opnum);
1236         }
1237
1238         resp->cstate.status = status;
1239         fh_put(&resp->cstate.current_fh);
1240         fh_put(&resp->cstate.save_fh);
1241         BUG_ON(resp->cstate.replay_owner);
1242 out:
1243         /* Reset deferral mechanism for RPC deferrals */
1244         rqstp->rq_usedeferral = 1;
1245         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1246         return status;
1247 }
1248
1249 static struct nfsd4_operation nfsd4_ops[] = {
1250         [OP_ACCESS] = {
1251                 .op_func = (nfsd4op_func)nfsd4_access,
1252                 .op_name = "OP_ACCESS",
1253         },
1254         [OP_CLOSE] = {
1255                 .op_func = (nfsd4op_func)nfsd4_close,
1256                 .op_name = "OP_CLOSE",
1257         },
1258         [OP_COMMIT] = {
1259                 .op_func = (nfsd4op_func)nfsd4_commit,
1260                 .op_name = "OP_COMMIT",
1261         },
1262         [OP_CREATE] = {
1263                 .op_func = (nfsd4op_func)nfsd4_create,
1264                 .op_name = "OP_CREATE",
1265                 .op_cacheresult = true,
1266         },
1267         [OP_DELEGRETURN] = {
1268                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1269                 .op_name = "OP_DELEGRETURN",
1270         },
1271         [OP_GETATTR] = {
1272                 .op_func = (nfsd4op_func)nfsd4_getattr,
1273                 .op_flags = ALLOWED_ON_ABSENT_FS,
1274                 .op_name = "OP_GETATTR",
1275         },
1276         [OP_GETFH] = {
1277                 .op_func = (nfsd4op_func)nfsd4_getfh,
1278                 .op_name = "OP_GETFH",
1279         },
1280         [OP_LINK] = {
1281                 .op_func = (nfsd4op_func)nfsd4_link,
1282                 .op_name = "OP_LINK",
1283                 .op_cacheresult = true,
1284         },
1285         [OP_LOCK] = {
1286                 .op_func = (nfsd4op_func)nfsd4_lock,
1287                 .op_name = "OP_LOCK",
1288         },
1289         [OP_LOCKT] = {
1290                 .op_func = (nfsd4op_func)nfsd4_lockt,
1291                 .op_name = "OP_LOCKT",
1292         },
1293         [OP_LOCKU] = {
1294                 .op_func = (nfsd4op_func)nfsd4_locku,
1295                 .op_name = "OP_LOCKU",
1296         },
1297         [OP_LOOKUP] = {
1298                 .op_func = (nfsd4op_func)nfsd4_lookup,
1299                 .op_flags = OP_HANDLES_WRONGSEC,
1300                 .op_name = "OP_LOOKUP",
1301         },
1302         [OP_LOOKUPP] = {
1303                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1304                 .op_flags = OP_HANDLES_WRONGSEC,
1305                 .op_name = "OP_LOOKUPP",
1306         },
1307         [OP_NVERIFY] = {
1308                 .op_func = (nfsd4op_func)nfsd4_nverify,
1309                 .op_name = "OP_NVERIFY",
1310         },
1311         [OP_OPEN] = {
1312                 .op_func = (nfsd4op_func)nfsd4_open,
1313                 .op_flags = OP_HANDLES_WRONGSEC,
1314                 .op_name = "OP_OPEN",
1315         },
1316         [OP_OPEN_CONFIRM] = {
1317                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1318                 .op_name = "OP_OPEN_CONFIRM",
1319         },
1320         [OP_OPEN_DOWNGRADE] = {
1321                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1322                 .op_name = "OP_OPEN_DOWNGRADE",
1323         },
1324         [OP_PUTFH] = {
1325                 .op_func = (nfsd4op_func)nfsd4_putfh,
1326                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1327                                 | OP_IS_PUTFH_LIKE,
1328                 .op_name = "OP_PUTFH",
1329         },
1330         [OP_PUTPUBFH] = {
1331                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1332                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1333                                 | OP_IS_PUTFH_LIKE,
1334                 .op_name = "OP_PUTPUBFH",
1335         },
1336         [OP_PUTROOTFH] = {
1337                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1338                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1339                                 | OP_IS_PUTFH_LIKE,
1340                 .op_name = "OP_PUTROOTFH",
1341         },
1342         [OP_READ] = {
1343                 .op_func = (nfsd4op_func)nfsd4_read,
1344                 .op_name = "OP_READ",
1345         },
1346         [OP_READDIR] = {
1347                 .op_func = (nfsd4op_func)nfsd4_readdir,
1348                 .op_name = "OP_READDIR",
1349         },
1350         [OP_READLINK] = {
1351                 .op_func = (nfsd4op_func)nfsd4_readlink,
1352                 .op_name = "OP_READLINK",
1353         },
1354         [OP_REMOVE] = {
1355                 .op_func = (nfsd4op_func)nfsd4_remove,
1356                 .op_name = "OP_REMOVE",
1357                 .op_cacheresult = true,
1358         },
1359         [OP_RENAME] = {
1360                 .op_name = "OP_RENAME",
1361                 .op_func = (nfsd4op_func)nfsd4_rename,
1362                 .op_cacheresult = true,
1363         },
1364         [OP_RENEW] = {
1365                 .op_func = (nfsd4op_func)nfsd4_renew,
1366                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1367                 .op_name = "OP_RENEW",
1368         },
1369         [OP_RESTOREFH] = {
1370                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1371                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1372                                 | OP_IS_PUTFH_LIKE,
1373                 .op_name = "OP_RESTOREFH",
1374         },
1375         [OP_SAVEFH] = {
1376                 .op_func = (nfsd4op_func)nfsd4_savefh,
1377                 .op_flags = OP_HANDLES_WRONGSEC,
1378                 .op_name = "OP_SAVEFH",
1379         },
1380         [OP_SECINFO] = {
1381                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1382                 .op_flags = OP_HANDLES_WRONGSEC,
1383                 .op_name = "OP_SECINFO",
1384         },
1385         [OP_SETATTR] = {
1386                 .op_func = (nfsd4op_func)nfsd4_setattr,
1387                 .op_name = "OP_SETATTR",
1388                 .op_cacheresult = true,
1389         },
1390         [OP_SETCLIENTID] = {
1391                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1392                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1393                 .op_name = "OP_SETCLIENTID",
1394                 .op_cacheresult = true,
1395         },
1396         [OP_SETCLIENTID_CONFIRM] = {
1397                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1398                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1399                 .op_name = "OP_SETCLIENTID_CONFIRM",
1400                 .op_cacheresult = true,
1401         },
1402         [OP_VERIFY] = {
1403                 .op_func = (nfsd4op_func)nfsd4_verify,
1404                 .op_name = "OP_VERIFY",
1405         },
1406         [OP_WRITE] = {
1407                 .op_func = (nfsd4op_func)nfsd4_write,
1408                 .op_name = "OP_WRITE",
1409                 .op_cacheresult = true,
1410         },
1411         [OP_RELEASE_LOCKOWNER] = {
1412                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1413                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1414                 .op_name = "OP_RELEASE_LOCKOWNER",
1415         },
1416
1417         /* NFSv4.1 operations */
1418         [OP_EXCHANGE_ID] = {
1419                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1420                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1421                 .op_name = "OP_EXCHANGE_ID",
1422         },
1423         [OP_BIND_CONN_TO_SESSION] = {
1424                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1425                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1426                 .op_name = "OP_BIND_CONN_TO_SESSION",
1427         },
1428         [OP_CREATE_SESSION] = {
1429                 .op_func = (nfsd4op_func)nfsd4_create_session,
1430                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1431                 .op_name = "OP_CREATE_SESSION",
1432         },
1433         [OP_DESTROY_SESSION] = {
1434                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1435                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1436                 .op_name = "OP_DESTROY_SESSION",
1437         },
1438         [OP_SEQUENCE] = {
1439                 .op_func = (nfsd4op_func)nfsd4_sequence,
1440                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1441                 .op_name = "OP_SEQUENCE",
1442         },
1443         [OP_DESTROY_CLIENTID] = {
1444                 .op_func = NULL,
1445                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1446                 .op_name = "OP_DESTROY_CLIENTID",
1447         },
1448         [OP_RECLAIM_COMPLETE] = {
1449                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1450                 .op_flags = ALLOWED_WITHOUT_FH,
1451                 .op_name = "OP_RECLAIM_COMPLETE",
1452         },
1453         [OP_SECINFO_NO_NAME] = {
1454                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1455                 .op_flags = OP_HANDLES_WRONGSEC,
1456                 .op_name = "OP_SECINFO_NO_NAME",
1457         },
1458         [OP_TEST_STATEID] = {
1459                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1460                 .op_flags = ALLOWED_WITHOUT_FH,
1461                 .op_name = "OP_TEST_STATEID",
1462         },
1463         [OP_FREE_STATEID] = {
1464                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1465                 .op_flags = ALLOWED_WITHOUT_FH,
1466                 .op_name = "OP_FREE_STATEID",
1467         },
1468 };
1469
1470 static const char *nfsd4_op_name(unsigned opnum)
1471 {
1472         if (opnum < ARRAY_SIZE(nfsd4_ops))
1473                 return nfsd4_ops[opnum].op_name;
1474         return "unknown_operation";
1475 }
1476
1477 #define nfsd4_voidres                   nfsd4_voidargs
1478 struct nfsd4_voidargs { int dummy; };
1479
1480 static struct svc_procedure             nfsd_procedures4[2] = {
1481         [NFSPROC4_NULL] = {
1482                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1483                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1484                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1485                 .pc_ressize = sizeof(struct nfsd4_voidres),
1486                 .pc_cachetype = RC_NOCACHE,
1487                 .pc_xdrressize = 1,
1488         },
1489         [NFSPROC4_COMPOUND] = {
1490                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1491                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1492                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1493                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1494                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1495                 .pc_release = nfsd4_release_compoundargs,
1496                 .pc_cachetype = RC_NOCACHE,
1497                 .pc_xdrressize = NFSD_BUFSIZE/4,
1498         },
1499 };
1500
1501 struct svc_version      nfsd_version4 = {
1502                 .vs_vers        = 4,
1503                 .vs_nproc       = 2,
1504                 .vs_proc        = nfsd_procedures4,
1505                 .vs_dispatch    = nfsd_dispatch,
1506                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1507 };
1508
1509 /*
1510  * Local variables:
1511  *  c-basic-offset: 8
1512  * End:
1513  */