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   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
  37 #include "cache.h"
  38 #include "xdr4.h"
  39 #include "vfs.h"
  40
  41 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  42
  43 static u32 nfsd_attrmask[] = {
  44         NFSD_WRITEABLE_ATTRS_WORD0,
  45         NFSD_WRITEABLE_ATTRS_WORD1,
  46         NFSD_WRITEABLE_ATTRS_WORD2
  47 };
  48
  49 static u32 nfsd41_ex_attrmask[] = {
  50         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  51         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  52         NFSD_SUPPATTR_EXCLCREAT_WORD2
  53 };
  54
  55 static __be32
  56 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  57                    u32 *bmval, u32 *writable)
  58 {
  59         struct dentry *dentry = cstate->current_fh.fh_dentry;
  60
  61         /*
  62          * Check about attributes are supported by the NFSv4 server or not.
  63          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  64          */
  65         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  66             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  67             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  68                 return nfserr_attrnotsupp;
  69
  70         /*
  71          * Check FATTR4_WORD0_ACL can be supported
  72          * in current environment or not.
  73          */
  74         if (bmval[0] & FATTR4_WORD0_ACL) {
  75                 if (!IS_POSIXACL(dentry->d_inode))
  76                         return nfserr_attrnotsupp;
  77         }
  78
  79         /*
  80          * According to spec, read-only attributes return ERR_INVAL.
  81          */
  82         if (writable) {
  83                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  84                     (bmval[2] & ~writable[2]))
  85                         return nfserr_inval;
  86         }
  87
  88         return nfs_ok;
  89 }
  90
  91 static __be32
  92 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  93         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  94 {
  95         __be32 status = nfs_ok;
  96
  97         if (open->op_create == NFS4_OPEN_CREATE) {
  98                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
  99                     || open->op_createmode == NFS4_CREATE_GUARDED)
 100                         status = check_attr_support(rqstp, cstate,
 101                                         open->op_bmval, nfsd_attrmask);
 102                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 103                         status = check_attr_support(rqstp, cstate,
 104                                         open->op_bmval, nfsd41_ex_attrmask);
 105         }
 106
 107         return status;
 108 }
 109
 110 static int
 111 is_create_with_attrs(struct nfsd4_open *open)
 112 {
 113         return open->op_create == NFS4_OPEN_CREATE
 114                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 115                     || open->op_createmode == NFS4_CREATE_GUARDED
 116                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 117 }
 118
 119 /*
 120  * if error occurs when setting the acl, just clear the acl bit
 121  * in the returned attr bitmap.
 122  */
 123 static void
 124 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 125                 struct nfs4_acl *acl, u32 *bmval)
 126 {
 127         __be32 status;
 128
 129         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 130         if (status)
 131                 /*
 132                  * We should probably fail the whole open at this point,
 133                  * but we've already created the file, so it's too late;
 134                  * So this seems the least of evils:
 135                  */
 136                 bmval[0] &= ~FATTR4_WORD0_ACL;
 137 }
 138
 139 static inline void
 140 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 141 {
 142         fh_put(dst);
 143         dget(src->fh_dentry);
 144         if (src->fh_export)
 145                 cache_get(&src->fh_export->h);
 146         *dst = *src;
 147 }
 148
 149 static __be32
 150 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 151 {
 152         __be32 status;
 153
 154         if (open->op_truncate &&
 155                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 156                 return nfserr_inval;
 157
 158         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 159                 accmode |= NFSD_MAY_READ;
 160         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 161                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 162         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 163                 accmode |= NFSD_MAY_WRITE;
 164
 165         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 166
 167         return status;
 168 }
 169
 170 static __be32
 171 do_open_lookup(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 172 {
 173         struct svc_fh resfh;
 174         __be32 status;
 175         int created = 0;
 176
 177         fh_init(&resfh, NFS4_FHSIZE);
 178         open->op_truncate = 0;
 179
 180         if (open->op_create) {
 181                 /* FIXME: check session persistence and pnfs flags.
 182                  * The nfsv4.1 spec requires the following semantics:
 183                  *
 184                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 185                  * Reply Cache  | server |                 |
 186                  * -------------+--------+-----------------+--------------------
 187                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 188                  *              |        |                 | (SHOULD)
 189                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 190                  *              |        |                 | (SHOULD NOT)
 191                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 192                  * yes          | no     | GUARDED4        | GUARDED4
 193                  * yes          | yes    | GUARDED4        | GUARDED4
 194                  */
 195
 196                 /*
 197                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 198                  * in NFSv4 as in v3.
 199                  */
 200                 status = nfsd_create_v3(rqstp, current_fh, open->op_fname.data,
 201                                         open->op_fname.len, &open->op_iattr,
 202                                         &resfh, open->op_createmode,
 203                                         (u32 *)open->op_verf.data,
 204                                         &open->op_truncate, &created);
 205
 206                 /*
 207                  * Following rfc 3530 14.2.16, use the returned bitmask
 208                  * to indicate which attributes we used to store the
 209                  * verifier:
 210                  */
 211                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 212                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 213                                                 FATTR4_WORD1_TIME_MODIFY);
 214         } else {
 215                 status = nfsd_lookup(rqstp, current_fh,
 216                                      open->op_fname.data, open->op_fname.len, &resfh);
 217                 fh_unlock(current_fh);
 218         }
 219         if (status)
 220                 goto out;
 221
 222         if (is_create_with_attrs(open) && open->op_acl != NULL)
 223                 do_set_nfs4_acl(rqstp, &resfh, open->op_acl, open->op_bmval);
 224
 225         set_change_info(&open->op_cinfo, current_fh);
 226         fh_dup2(current_fh, &resfh);
 227
 228         /* set reply cache */
 229         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 230                         &resfh.fh_handle);
 231         if (!created)
 232                 status = do_open_permission(rqstp, current_fh, open,
 233                                             NFSD_MAY_NOP);
 234
 235 out:
 236         fh_put(&resfh);
 237         return status;
 238 }
 239
 240 static __be32
 241 do_open_fhandle(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
 242 {
 243         __be32 status;
 244
 245         /* Only reclaims from previously confirmed clients are valid */
 246         if ((status = nfs4_check_open_reclaim(&open->op_clientid)))
 247                 return status;
 248
 249         /* We don't know the target directory, and therefore can not
 250         * set the change info
 251         */
 252
 253         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 254
 255         /* set replay cache */
 256         fh_copy_shallow(&open->op_stateowner->so_replay.rp_openfh,
 257                         &current_fh->fh_handle);
 258
 259         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 260                 (open->op_iattr.ia_size == 0);
 261
 262         status = do_open_permission(rqstp, current_fh, open,
 263                                     NFSD_MAY_OWNER_OVERRIDE);
 264
 265         return status;
 266 }
 267
 268 static void
 269 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 270 {
 271         struct nfsd4_sessionid *sid =
 272                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 273
 274         clid->cl_boot = sid->clientid.cl_boot;
 275         clid->cl_id = sid->clientid.cl_id;
 276 }
 277
 278 static __be32
 279 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 280            struct nfsd4_open *open)
 281 {
 282         __be32 status;
 283         struct nfsd4_compoundres *resp;
 284
 285         dprintk("NFSD: nfsd4_open filename %.*s op_stateowner %p\n",
 286                 (int)open->op_fname.len, open->op_fname.data,
 287                 open->op_stateowner);
 288
 289         /* This check required by spec. */
 290         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 291                 return nfserr_inval;
 292
 293         if (nfsd4_has_session(cstate))
 294                 copy_clientid(&open->op_clientid, cstate->session);
 295
 296         nfs4_lock_state();
 297
 298         /* check seqid for replay. set nfs4_owner */
 299         resp = rqstp->rq_resp;
 300         status = nfsd4_process_open1(&resp->cstate, open);
 301         if (status == nfserr_replay_me) {
 302                 struct nfs4_replay *rp = &open->op_stateowner->so_replay;
 303                 fh_put(&cstate->current_fh);
 304                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 305                                 &rp->rp_openfh);
 306                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 307                 if (status)
 308                         dprintk("nfsd4_open: replay failed"
 309                                 " restoring previous filehandle\n");
 310                 else
 311                         status = nfserr_replay_me;
 312         }
 313         if (status)
 314                 goto out;
 315
 316         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 317         if (status)
 318                 goto out;
 319
 320         /* Openowner is now set, so sequence id will get bumped.  Now we need
 321          * these checks before we do any creates: */
 322         status = nfserr_grace;
 323         if (locks_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 324                 goto out;
 325         status = nfserr_no_grace;
 326         if (!locks_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 327                 goto out;
 328
 329         switch (open->op_claim_type) {
 330                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 331                 case NFS4_OPEN_CLAIM_NULL:
 332                         /*
 333                          * (1) set CURRENT_FH to the file being opened,
 334                          * creating it if necessary, (2) set open->op_cinfo,
 335                          * (3) set open->op_truncate if the file is to be
 336                          * truncated after opening, (4) do permission checking.
 337                          */
 338                         status = do_open_lookup(rqstp, &cstate->current_fh,
 339                                                 open);
 340                         if (status)
 341                                 goto out;
 342                         break;
 343                 case NFS4_OPEN_CLAIM_PREVIOUS:
 344                         open->op_stateowner->so_confirmed = 1;
 345                         /*
 346                          * The CURRENT_FH is already set to the file being
 347                          * opened.  (1) set open->op_cinfo, (2) set
 348                          * open->op_truncate if the file is to be truncated
 349                          * after opening, (3) do permission checking.
 350                         */
 351                         status = do_open_fhandle(rqstp, &cstate->current_fh,
 352                                                  open);
 353                         if (status)
 354                                 goto out;
 355                         break;
 356                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 357                         open->op_stateowner->so_confirmed = 1;
 358                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 359                                 open->op_claim_type);
 360                         status = nfserr_notsupp;
 361                         goto out;
 362                 default:
 363                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 364                                 open->op_claim_type);
 365                         status = nfserr_inval;
 366                         goto out;
 367         }
 368         /*
 369          * nfsd4_process_open2() does the actual opening of the file.  If
 370          * successful, it (1) truncates the file if open->op_truncate was
 371          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 372          */
 373         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 374 out:
 375         if (open->op_stateowner) {
 376                 nfs4_get_stateowner(open->op_stateowner);
 377                 cstate->replay_owner = open->op_stateowner;
 378         }
 379         nfs4_unlock_state();
 380         return status;
 381 }
 382
 383 /*
 384  * filehandle-manipulating ops.
 385  */
 386 static __be32
 387 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 388             struct svc_fh **getfh)
 389 {
 390         if (!cstate->current_fh.fh_dentry)
 391                 return nfserr_nofilehandle;
 392
 393         *getfh = &cstate->current_fh;
 394         return nfs_ok;
 395 }
 396
 397 static __be32
 398 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 399             struct nfsd4_putfh *putfh)
 400 {
 401         fh_put(&cstate->current_fh);
 402         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 403         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 404                putfh->pf_fhlen);
 405         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 406 }
 407
 408 static __be32
 409 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 410                 void *arg)
 411 {
 412         __be32 status;
 413
 414         fh_put(&cstate->current_fh);
 415         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 416         return status;
 417 }
 418
 419 static __be32
 420 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 421                 void *arg)
 422 {
 423         if (!cstate->save_fh.fh_dentry)
 424                 return nfserr_restorefh;
 425
 426         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 427         return nfs_ok;
 428 }
 429
 430 static __be32
 431 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 432              void *arg)
 433 {
 434         if (!cstate->current_fh.fh_dentry)
 435                 return nfserr_nofilehandle;
 436
 437         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 438         return nfs_ok;
 439 }
 440
 441 /*
 442  * misc nfsv4 ops
 443  */
 444 static __be32
 445 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 446              struct nfsd4_access *access)
 447 {
 448         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 449                 return nfserr_inval;
 450
 451         access->ac_resp_access = access->ac_req_access;
 452         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 453                            &access->ac_supported);
 454 }
 455
 456 static __be32
 457 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 458              struct nfsd4_commit *commit)
 459 {
 460         __be32 status;
 461
 462         u32 *p = (u32 *)commit->co_verf.data;
 463         *p++ = nfssvc_boot.tv_sec;
 464         *p++ = nfssvc_boot.tv_usec;
 465
 466         status = nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 467                              commit->co_count);
 468         if (status == nfserr_symlink)
 469                 status = nfserr_inval;
 470         return status;
 471 }
 472
 473 static __be32
 474 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 475              struct nfsd4_create *create)
 476 {
 477         struct svc_fh resfh;
 478         __be32 status;
 479         dev_t rdev;
 480
 481         fh_init(&resfh, NFS4_FHSIZE);
 482
 483         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 484                            NFSD_MAY_CREATE);
 485         if (status == nfserr_symlink)
 486                 status = nfserr_notdir;
 487         if (status)
 488                 return status;
 489
 490         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 491                                     nfsd_attrmask);
 492         if (status)
 493                 return status;
 494
 495         switch (create->cr_type) {
 496         case NF4LNK:
 497                 /* ugh! we have to null-terminate the linktext, or
 498                  * vfs_symlink() will choke.  it is always safe to
 499                  * null-terminate by brute force, since at worst we
 500                  * will overwrite the first byte of the create namelen
 501                  * in the XDR buffer, which has already been extracted
 502                  * during XDR decode.
 503                  */
 504                 create->cr_linkname[create->cr_linklen] = 0;
 505
 506                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 507                                       create->cr_name, create->cr_namelen,
 508                                       create->cr_linkname, create->cr_linklen,
 509                                       &resfh, &create->cr_iattr);
 510                 break;
 511
 512         case NF4BLK:
 513                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 514                 if (MAJOR(rdev) != create->cr_specdata1 ||
 515                     MINOR(rdev) != create->cr_specdata2)
 516                         return nfserr_inval;
 517                 status = nfsd_create(rqstp, &cstate->current_fh,
 518                                      create->cr_name, create->cr_namelen,
 519                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 520                 break;
 521
 522         case NF4CHR:
 523                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 524                 if (MAJOR(rdev) != create->cr_specdata1 ||
 525                     MINOR(rdev) != create->cr_specdata2)
 526                         return nfserr_inval;
 527                 status = nfsd_create(rqstp, &cstate->current_fh,
 528                                      create->cr_name, create->cr_namelen,
 529                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 530                 break;
 531
 532         case NF4SOCK:
 533                 status = nfsd_create(rqstp, &cstate->current_fh,
 534                                      create->cr_name, create->cr_namelen,
 535                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 536                 break;
 537
 538         case NF4FIFO:
 539                 status = nfsd_create(rqstp, &cstate->current_fh,
 540                                      create->cr_name, create->cr_namelen,
 541                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 542                 break;
 543
 544         case NF4DIR:
 545                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 546                 status = nfsd_create(rqstp, &cstate->current_fh,
 547                                      create->cr_name, create->cr_namelen,
 548                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 549                 break;
 550
 551         default:
 552                 status = nfserr_badtype;
 553         }
 554
 555         if (status)
 556                 goto out;
 557
 558         if (create->cr_acl != NULL)
 559                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 560                                 create->cr_bmval);
 561
 562         fh_unlock(&cstate->current_fh);
 563         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 564         fh_dup2(&cstate->current_fh, &resfh);
 565 out:
 566         fh_put(&resfh);
 567         return status;
 568 }
 569
 570 static __be32
 571 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 572               struct nfsd4_getattr *getattr)
 573 {
 574         __be32 status;
 575
 576         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 577         if (status)
 578                 return status;
 579
 580         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 581                 return nfserr_inval;
 582
 583         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 584         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 585         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 586
 587         getattr->ga_fhp = &cstate->current_fh;
 588         return nfs_ok;
 589 }
 590
 591 static __be32
 592 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593            struct nfsd4_link *link)
 594 {
 595         __be32 status = nfserr_nofilehandle;
 596
 597         if (!cstate->save_fh.fh_dentry)
 598                 return status;
 599         status = nfsd_link(rqstp, &cstate->current_fh,
 600                            link->li_name, link->li_namelen, &cstate->save_fh);
 601         if (!status)
 602                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 603         return status;
 604 }
 605
 606 static __be32
 607 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 608               void *arg)
 609 {
 610         struct svc_fh tmp_fh;
 611         __be32 ret;
 612
 613         fh_init(&tmp_fh, NFS4_FHSIZE);
 614         ret = exp_pseudoroot(rqstp, &tmp_fh);
 615         if (ret)
 616                 return ret;
 617         if (tmp_fh.fh_dentry == cstate->current_fh.fh_dentry) {
 618                 fh_put(&tmp_fh);
 619                 return nfserr_noent;
 620         }
 621         fh_put(&tmp_fh);
 622         return nfsd_lookup(rqstp, &cstate->current_fh,
 623                            "..", 2, &cstate->current_fh);
 624 }
 625
 626 static __be32
 627 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 628              struct nfsd4_lookup *lookup)
 629 {
 630         return nfsd_lookup(rqstp, &cstate->current_fh,
 631                            lookup->lo_name, lookup->lo_len,
 632                            &cstate->current_fh);
 633 }
 634
 635 static __be32
 636 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 637            struct nfsd4_read *read)
 638 {
 639         __be32 status;
 640
 641         /* no need to check permission - this will be done in nfsd_read() */
 642
 643         read->rd_filp = NULL;
 644         if (read->rd_offset >= OFFSET_MAX)
 645                 return nfserr_inval;
 646
 647         nfs4_lock_state();
 648         /* check stateid */
 649         if ((status = nfs4_preprocess_stateid_op(cstate, &read->rd_stateid,
 650                                                  RD_STATE, &read->rd_filp))) {
 651                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 652                 goto out;
 653         }
 654         if (read->rd_filp)
 655                 get_file(read->rd_filp);
 656         status = nfs_ok;
 657 out:
 658         nfs4_unlock_state();
 659         read->rd_rqstp = rqstp;
 660         read->rd_fhp = &cstate->current_fh;
 661         return status;
 662 }
 663
 664 static __be32
 665 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 666               struct nfsd4_readdir *readdir)
 667 {
 668         u64 cookie = readdir->rd_cookie;
 669         static const nfs4_verifier zeroverf;
 670
 671         /* no need to check permission - this will be done in nfsd_readdir() */
 672
 673         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 674                 return nfserr_inval;
 675
 676         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 677         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 678         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 679
 680         if ((cookie > ~(u32)0) || (cookie == 1) || (cookie == 2) ||
 681             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 682                 return nfserr_bad_cookie;
 683
 684         readdir->rd_rqstp = rqstp;
 685         readdir->rd_fhp = &cstate->current_fh;
 686         return nfs_ok;
 687 }
 688
 689 static __be32
 690 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 691                struct nfsd4_readlink *readlink)
 692 {
 693         readlink->rl_rqstp = rqstp;
 694         readlink->rl_fhp = &cstate->current_fh;
 695         return nfs_ok;
 696 }
 697
 698 static __be32
 699 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 700              struct nfsd4_remove *remove)
 701 {
 702         __be32 status;
 703
 704         if (locks_in_grace())
 705                 return nfserr_grace;
 706         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 707                              remove->rm_name, remove->rm_namelen);
 708         if (status == nfserr_symlink)
 709                 return nfserr_notdir;
 710         if (!status) {
 711                 fh_unlock(&cstate->current_fh);
 712                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 713         }
 714         return status;
 715 }
 716
 717 static __be32
 718 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 719              struct nfsd4_rename *rename)
 720 {
 721         __be32 status = nfserr_nofilehandle;
 722
 723         if (!cstate->save_fh.fh_dentry)
 724                 return status;
 725         if (locks_in_grace() && !(cstate->save_fh.fh_export->ex_flags
 726                                         & NFSEXP_NOSUBTREECHECK))
 727                 return nfserr_grace;
 728         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 729                              rename->rn_snamelen, &cstate->current_fh,
 730                              rename->rn_tname, rename->rn_tnamelen);
 731
 732         /* the underlying filesystem returns different error's than required
 733          * by NFSv4. both save_fh and current_fh have been verified.. */
 734         if (status == nfserr_isdir)
 735                 status = nfserr_exist;
 736         else if ((status == nfserr_notdir) &&
 737                   (S_ISDIR(cstate->save_fh.fh_dentry->d_inode->i_mode) &&
 738                    S_ISDIR(cstate->current_fh.fh_dentry->d_inode->i_mode)))
 739                 status = nfserr_exist;
 740         else if (status == nfserr_symlink)
 741                 status = nfserr_notdir;
 742
 743         if (!status) {
 744                 set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 745                 set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 746         }
 747         return status;
 748 }
 749
 750 static __be32
 751 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 752               struct nfsd4_secinfo *secinfo)
 753 {
 754         struct svc_fh resfh;
 755         struct svc_export *exp;
 756         struct dentry *dentry;
 757         __be32 err;
 758
 759         fh_init(&resfh, NFS4_FHSIZE);
 760         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 761                                     secinfo->si_name, secinfo->si_namelen,
 762                                     &exp, &dentry);
 763         if (err)
 764                 return err;
 765         if (dentry->d_inode == NULL) {
 766                 exp_put(exp);
 767                 err = nfserr_noent;
 768         } else
 769                 secinfo->si_exp = exp;
 770         dput(dentry);
 771         return err;
 772 }
 773
 774 static __be32
 775 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 776               struct nfsd4_setattr *setattr)
 777 {
 778         __be32 status = nfs_ok;
 779
 780         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 781                 nfs4_lock_state();
 782                 status = nfs4_preprocess_stateid_op(cstate,
 783                         &setattr->sa_stateid, WR_STATE, NULL);
 784                 nfs4_unlock_state();
 785                 if (status) {
 786                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 787                         return status;
 788                 }
 789         }
 790         status = mnt_want_write(cstate->current_fh.fh_export->ex_path.mnt);
 791         if (status)
 792                 return status;
 793         status = nfs_ok;
 794
 795         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 796                                     nfsd_attrmask);
 797         if (status)
 798                 goto out;
 799
 800         if (setattr->sa_acl != NULL)
 801                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 802                                             setattr->sa_acl);
 803         if (status)
 804                 goto out;
 805         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 806                                 0, (time_t)0);
 807 out:
 808         mnt_drop_write(cstate->current_fh.fh_export->ex_path.mnt);
 809         return status;
 810 }
 811
 812 static __be32
 813 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 814             struct nfsd4_write *write)
 815 {
 816         stateid_t *stateid = &write->wr_stateid;
 817         struct file *filp = NULL;
 818         u32 *p;
 819         __be32 status = nfs_ok;
 820         unsigned long cnt;
 821
 822         /* no need to check permission - this will be done in nfsd_write() */
 823
 824         if (write->wr_offset >= OFFSET_MAX)
 825                 return nfserr_inval;
 826
 827         nfs4_lock_state();
 828         status = nfs4_preprocess_stateid_op(cstate, stateid, WR_STATE, &filp);
 829         if (filp)
 830                 get_file(filp);
 831         nfs4_unlock_state();
 832
 833         if (status) {
 834                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 835                 return status;
 836         }
 837
 838         cnt = write->wr_buflen;
 839         write->wr_how_written = write->wr_stable_how;
 840         p = (u32 *)write->wr_verifier.data;
 841         *p++ = nfssvc_boot.tv_sec;
 842         *p++ = nfssvc_boot.tv_usec;
 843
 844         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 845                              write->wr_offset, rqstp->rq_vec, write->wr_vlen,
 846                              &cnt, &write->wr_how_written);
 847         if (filp)
 848                 fput(filp);
 849
 850         write->wr_bytes_written = cnt;
 851
 852         if (status == nfserr_symlink)
 853                 status = nfserr_inval;
 854         return status;
 855 }
 856
 857 /* This routine never returns NFS_OK!  If there are no other errors, it
 858  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 859  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 860  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 861  */
 862 static __be32
 863 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 864              struct nfsd4_verify *verify)
 865 {
 866         __be32 *buf, *p;
 867         int count;
 868         __be32 status;
 869
 870         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 871         if (status)
 872                 return status;
 873
 874         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
 875         if (status)
 876                 return status;
 877
 878         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
 879             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
 880                 return nfserr_inval;
 881         if (verify->ve_attrlen & 3)
 882                 return nfserr_inval;
 883
 884         /* count in words:
 885          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
 886          */
 887         count = 4 + (verify->ve_attrlen >> 2);
 888         buf = kmalloc(count << 2, GFP_KERNEL);
 889         if (!buf)
 890                 return nfserr_resource;
 891
 892         status = nfsd4_encode_fattr(&cstate->current_fh,
 893                                     cstate->current_fh.fh_export,
 894                                     cstate->current_fh.fh_dentry, buf,
 895                                     &count, verify->ve_bmval,
 896                                     rqstp, 0);
 897
 898         /* this means that nfsd4_encode_fattr() ran out of space */
 899         if (status == nfserr_resource && count == 0)
 900                 status = nfserr_not_same;
 901         if (status)
 902                 goto out_kfree;
 903
 904         /* skip bitmap */
 905         p = buf + 1 + ntohl(buf[0]);
 906         status = nfserr_not_same;
 907         if (ntohl(*p++) != verify->ve_attrlen)
 908                 goto out_kfree;
 909         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
 910                 status = nfserr_same;
 911
 912 out_kfree:
 913         kfree(buf);
 914         return status;
 915 }
 916
 917 static __be32
 918 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 919               struct nfsd4_verify *verify)
 920 {
 921         __be32 status;
 922
 923         status = _nfsd4_verify(rqstp, cstate, verify);
 924         return status == nfserr_not_same ? nfs_ok : status;
 925 }
 926
 927 static __be32
 928 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 929              struct nfsd4_verify *verify)
 930 {
 931         __be32 status;
 932
 933         status = _nfsd4_verify(rqstp, cstate, verify);
 934         return status == nfserr_same ? nfs_ok : status;
 935 }
 936
 937 /*
 938  * NULL call.
 939  */
 940 static __be32
 941 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
 942 {
 943         return nfs_ok;
 944 }
 945
 946 static inline void nfsd4_increment_op_stats(u32 opnum)
 947 {
 948         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
 949                 nfsdstats.nfs4_opcount[opnum]++;
 950 }
 951
 952 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
 953                               void *);
 954 enum nfsd4_op_flags {
 955         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
 956         ALLOWED_ON_ABSENT_FS = 2 << 0,  /* ops processed on absent fs */
 957         ALLOWED_AS_FIRST_OP = 3 << 0,   /* ops reqired first in compound */
 958 };
 959
 960 struct nfsd4_operation {
 961         nfsd4op_func op_func;
 962         u32 op_flags;
 963         char *op_name;
 964 };
 965
 966 static struct nfsd4_operation nfsd4_ops[];
 967
 968 static const char *nfsd4_op_name(unsigned opnum);
 969
 970 /*
 971  * Enforce NFSv4.1 COMPOUND ordering rules:
 972  *
 973  * Also note, enforced elsewhere:
 974  *      - SEQUENCE other than as first op results in
 975  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
 976  *      - BIND_CONN_TO_SESSION must be the only op in its compound
 977  *        (Will be enforced in nfsd4_bind_conn_to_session().)
 978  *      - DESTROY_SESSION must be the final operation in a compound, if
 979  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
 980  *        (Enforced in nfsd4_destroy_session().)
 981  */
 982 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
 983 {
 984         struct nfsd4_op *op = &args->ops[0];
 985
 986         /* These ordering requirements don't apply to NFSv4.0: */
 987         if (args->minorversion == 0)
 988                 return nfs_ok;
 989         /* This is weird, but OK, not our problem: */
 990         if (args->opcnt == 0)
 991                 return nfs_ok;
 992         if (op->status == nfserr_op_illegal)
 993                 return nfs_ok;
 994         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
 995                 return nfserr_op_not_in_session;
 996         if (op->opnum == OP_SEQUENCE)
 997                 return nfs_ok;
 998         if (args->opcnt != 1)
 999                 return nfserr_not_only_op;
1000         return nfs_ok;
1001 }
1002
1003 /*
1004  * COMPOUND call.
1005  */
1006 static __be32
1007 nfsd4_proc_compound(struct svc_rqst *rqstp,
1008                     struct nfsd4_compoundargs *args,
1009                     struct nfsd4_compoundres *resp)
1010 {
1011         struct nfsd4_op *op;
1012         struct nfsd4_operation *opdesc;
1013         struct nfsd4_compound_state *cstate = &resp->cstate;
1014         int             slack_bytes;
1015         __be32          status;
1016
1017         resp->xbuf = &rqstp->rq_res;
1018         resp->p = rqstp->rq_res.head[0].iov_base +
1019                                                 rqstp->rq_res.head[0].iov_len;
1020         resp->tagp = resp->p;
1021         /* reserve space for: taglen, tag, and opcnt */
1022         resp->p += 2 + XDR_QUADLEN(args->taglen);
1023         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1024         resp->taglen = args->taglen;
1025         resp->tag = args->tag;
1026         resp->opcnt = 0;
1027         resp->rqstp = rqstp;
1028         resp->cstate.minorversion = args->minorversion;
1029         resp->cstate.replay_owner = NULL;
1030         resp->cstate.session = NULL;
1031         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1032         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1033         /* Use the deferral mechanism only for NFSv4.0 compounds */
1034         rqstp->rq_usedeferral = (args->minorversion == 0);
1035
1036         /*
1037          * According to RFC3010, this takes precedence over all other errors.
1038          */
1039         status = nfserr_minor_vers_mismatch;
1040         if (args->minorversion > nfsd_supported_minorversion)
1041                 goto out;
1042
1043         status = nfs41_check_op_ordering(args);
1044         if (status) {
1045                 op = &args->ops[0];
1046                 op->status = status;
1047                 goto encode_op;
1048         }
1049
1050         while (!status && resp->opcnt < args->opcnt) {
1051                 op = &args->ops[resp->opcnt++];
1052
1053                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1054                         resp->opcnt, args->opcnt, op->opnum,
1055                         nfsd4_op_name(op->opnum));
1056                 /*
1057                  * The XDR decode routines may have pre-set op->status;
1058                  * for example, if there is a miscellaneous XDR error
1059                  * it will be set to nfserr_bad_xdr.
1060                  */
1061                 if (op->status)
1062                         goto encode_op;
1063
1064                 /* We must be able to encode a successful response to
1065                  * this operation, with enough room left over to encode a
1066                  * failed response to the next operation.  If we don't
1067                  * have enough room, fail with ERR_RESOURCE.
1068                  */
1069                 slack_bytes = (char *)resp->end - (char *)resp->p;
1070                 if (slack_bytes < COMPOUND_SLACK_SPACE
1071                                 + COMPOUND_ERR_SLACK_SPACE) {
1072                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1073                         op->status = nfserr_resource;
1074                         goto encode_op;
1075                 }
1076
1077                 opdesc = &nfsd4_ops[op->opnum];
1078
1079                 if (!cstate->current_fh.fh_dentry) {
1080                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1081                                 op->status = nfserr_nofilehandle;
1082                                 goto encode_op;
1083                         }
1084                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1085                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1086                         op->status = nfserr_moved;
1087                         goto encode_op;
1088                 }
1089
1090                 if (opdesc->op_func)
1091                         op->status = opdesc->op_func(rqstp, cstate, &op->u);
1092                 else
1093                         BUG_ON(op->status == nfs_ok);
1094
1095 encode_op:
1096                 /* Only from SEQUENCE */
1097                 if (resp->cstate.status == nfserr_replay_cache) {
1098                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1099                         status = op->status;
1100                         goto out;
1101                 }
1102                 if (op->status == nfserr_replay_me) {
1103                         op->replay = &cstate->replay_owner->so_replay;
1104                         nfsd4_encode_replay(resp, op);
1105                         status = op->status = op->replay->rp_status;
1106                 } else {
1107                         nfsd4_encode_operation(resp, op);
1108                         status = op->status;
1109                 }
1110
1111                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1112                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1113                         be32_to_cpu(status));
1114
1115                 if (cstate->replay_owner) {
1116                         nfs4_put_stateowner(cstate->replay_owner);
1117                         cstate->replay_owner = NULL;
1118                 }
1119                 /* XXX Ugh, we need to get rid of this kind of special case: */
1120                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1121                         fput(op->u.read.rd_filp);
1122
1123                 nfsd4_increment_op_stats(op->opnum);
1124         }
1125         if (!rqstp->rq_usedeferral && status == nfserr_dropit) {
1126                 dprintk("%s Dropit - send NFS4ERR_DELAY\n", __func__);
1127                 status = nfserr_jukebox;
1128         }
1129
1130         resp->cstate.status = status;
1131         fh_put(&resp->cstate.current_fh);
1132         fh_put(&resp->cstate.save_fh);
1133         BUG_ON(resp->cstate.replay_owner);
1134 out:
1135         nfsd4_release_compoundargs(args);
1136         /* Reset deferral mechanism for RPC deferrals */
1137         rqstp->rq_usedeferral = 1;
1138         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1139         return status;
1140 }
1141
1142 static struct nfsd4_operation nfsd4_ops[] = {
1143         [OP_ACCESS] = {
1144                 .op_func = (nfsd4op_func)nfsd4_access,
1145                 .op_name = "OP_ACCESS",
1146         },
1147         [OP_CLOSE] = {
1148                 .op_func = (nfsd4op_func)nfsd4_close,
1149                 .op_name = "OP_CLOSE",
1150         },
1151         [OP_COMMIT] = {
1152                 .op_func = (nfsd4op_func)nfsd4_commit,
1153                 .op_name = "OP_COMMIT",
1154         },
1155         [OP_CREATE] = {
1156                 .op_func = (nfsd4op_func)nfsd4_create,
1157                 .op_name = "OP_CREATE",
1158         },
1159         [OP_DELEGRETURN] = {
1160                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1161                 .op_name = "OP_DELEGRETURN",
1162         },
1163         [OP_GETATTR] = {
1164                 .op_func = (nfsd4op_func)nfsd4_getattr,
1165                 .op_flags = ALLOWED_ON_ABSENT_FS,
1166                 .op_name = "OP_GETATTR",
1167         },
1168         [OP_GETFH] = {
1169                 .op_func = (nfsd4op_func)nfsd4_getfh,
1170                 .op_name = "OP_GETFH",
1171         },
1172         [OP_LINK] = {
1173                 .op_func = (nfsd4op_func)nfsd4_link,
1174                 .op_name = "OP_LINK",
1175         },
1176         [OP_LOCK] = {
1177                 .op_func = (nfsd4op_func)nfsd4_lock,
1178                 .op_name = "OP_LOCK",
1179         },
1180         [OP_LOCKT] = {
1181                 .op_func = (nfsd4op_func)nfsd4_lockt,
1182                 .op_name = "OP_LOCKT",
1183         },
1184         [OP_LOCKU] = {
1185                 .op_func = (nfsd4op_func)nfsd4_locku,
1186                 .op_name = "OP_LOCKU",
1187         },
1188         [OP_LOOKUP] = {
1189                 .op_func = (nfsd4op_func)nfsd4_lookup,
1190                 .op_name = "OP_LOOKUP",
1191         },
1192         [OP_LOOKUPP] = {
1193                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1194                 .op_name = "OP_LOOKUPP",
1195         },
1196         [OP_NVERIFY] = {
1197                 .op_func = (nfsd4op_func)nfsd4_nverify,
1198                 .op_name = "OP_NVERIFY",
1199         },
1200         [OP_OPEN] = {
1201                 .op_func = (nfsd4op_func)nfsd4_open,
1202                 .op_name = "OP_OPEN",
1203         },
1204         [OP_OPEN_CONFIRM] = {
1205                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1206                 .op_name = "OP_OPEN_CONFIRM",
1207         },
1208         [OP_OPEN_DOWNGRADE] = {
1209                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1210                 .op_name = "OP_OPEN_DOWNGRADE",
1211         },
1212         [OP_PUTFH] = {
1213                 .op_func = (nfsd4op_func)nfsd4_putfh,
1214                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1215                 .op_name = "OP_PUTFH",
1216         },
1217         [OP_PUTPUBFH] = {
1218                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1219                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1220                 .op_name = "OP_PUTPUBFH",
1221         },
1222         [OP_PUTROOTFH] = {
1223                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1224                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1225                 .op_name = "OP_PUTROOTFH",
1226         },
1227         [OP_READ] = {
1228                 .op_func = (nfsd4op_func)nfsd4_read,
1229                 .op_name = "OP_READ",
1230         },
1231         [OP_READDIR] = {
1232                 .op_func = (nfsd4op_func)nfsd4_readdir,
1233                 .op_name = "OP_READDIR",
1234         },
1235         [OP_READLINK] = {
1236                 .op_func = (nfsd4op_func)nfsd4_readlink,
1237                 .op_name = "OP_READLINK",
1238         },
1239         [OP_REMOVE] = {
1240                 .op_func = (nfsd4op_func)nfsd4_remove,
1241                 .op_name = "OP_REMOVE",
1242         },
1243         [OP_RENAME] = {
1244                 .op_name = "OP_RENAME",
1245                 .op_func = (nfsd4op_func)nfsd4_rename,
1246         },
1247         [OP_RENEW] = {
1248                 .op_func = (nfsd4op_func)nfsd4_renew,
1249                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1250                 .op_name = "OP_RENEW",
1251         },
1252         [OP_RESTOREFH] = {
1253                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1254                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1255                 .op_name = "OP_RESTOREFH",
1256         },
1257         [OP_SAVEFH] = {
1258                 .op_func = (nfsd4op_func)nfsd4_savefh,
1259                 .op_name = "OP_SAVEFH",
1260         },
1261         [OP_SECINFO] = {
1262                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1263                 .op_name = "OP_SECINFO",
1264         },
1265         [OP_SETATTR] = {
1266                 .op_func = (nfsd4op_func)nfsd4_setattr,
1267                 .op_name = "OP_SETATTR",
1268         },
1269         [OP_SETCLIENTID] = {
1270                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1271                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1272                 .op_name = "OP_SETCLIENTID",
1273         },
1274         [OP_SETCLIENTID_CONFIRM] = {
1275                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1276                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1277                 .op_name = "OP_SETCLIENTID_CONFIRM",
1278         },
1279         [OP_VERIFY] = {
1280                 .op_func = (nfsd4op_func)nfsd4_verify,
1281                 .op_name = "OP_VERIFY",
1282         },
1283         [OP_WRITE] = {
1284                 .op_func = (nfsd4op_func)nfsd4_write,
1285                 .op_name = "OP_WRITE",
1286         },
1287         [OP_RELEASE_LOCKOWNER] = {
1288                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1289                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS,
1290                 .op_name = "OP_RELEASE_LOCKOWNER",
1291         },
1292
1293         /* NFSv4.1 operations */
1294         [OP_EXCHANGE_ID] = {
1295                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1296                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1297                 .op_name = "OP_EXCHANGE_ID",
1298         },
1299         [OP_CREATE_SESSION] = {
1300                 .op_func = (nfsd4op_func)nfsd4_create_session,
1301                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1302                 .op_name = "OP_CREATE_SESSION",
1303         },
1304         [OP_DESTROY_SESSION] = {
1305                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1306                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1307                 .op_name = "OP_DESTROY_SESSION",
1308         },
1309         [OP_SEQUENCE] = {
1310                 .op_func = (nfsd4op_func)nfsd4_sequence,
1311                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1312                 .op_name = "OP_SEQUENCE",
1313         },
1314 };
1315
1316 static const char *nfsd4_op_name(unsigned opnum)
1317 {
1318         if (opnum < ARRAY_SIZE(nfsd4_ops))
1319                 return nfsd4_ops[opnum].op_name;
1320         return "unknown_operation";
1321 }
1322
1323 #define nfsd4_voidres                   nfsd4_voidargs
1324 struct nfsd4_voidargs { int dummy; };
1325
1326 /*
1327  * TODO: At the present time, the NFSv4 server does not do XID caching
1328  * of requests.  Implementing XID caching would not be a serious problem,
1329  * although it would require a mild change in interfaces since one
1330  * doesn't know whether an NFSv4 request is idempotent until after the
1331  * XDR decode.  However, XID caching totally confuses pynfs (Peter
1332  * Astrand's regression testsuite for NFSv4 servers), which reuses
1333  * XID's liberally, so I've left it unimplemented until pynfs generates
1334  * better XID's.
1335  */
1336 static struct svc_procedure             nfsd_procedures4[2] = {
1337         [NFSPROC4_NULL] = {
1338                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1339                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1340                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1341                 .pc_ressize = sizeof(struct nfsd4_voidres),
1342                 .pc_cachetype = RC_NOCACHE,
1343                 .pc_xdrressize = 1,
1344         },
1345         [NFSPROC4_COMPOUND] = {
1346                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1347                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1348                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1349                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1350                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1351                 .pc_cachetype = RC_NOCACHE,
1352                 .pc_xdrressize = NFSD_BUFSIZE/4,
1353         },
1354 };
1355
1356 struct svc_version      nfsd_version4 = {
1357                 .vs_vers        = 4,
1358                 .vs_nproc       = 2,
1359                 .vs_proc        = nfsd_procedures4,
1360                 .vs_dispatch    = nfsd_dispatch,
1361                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1362 };
1363
1364 /*
1365  * Local variables:
1366  *  c-basic-offset: 8
1367  * End:
1368  */