fs/nfsd/nfs4proc.c

   1 /*
   2  *  Server-side procedures for NFSv4.
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include <linux/file.h>
  36 #include <linux/slab.h>
  37
  38 #include "idmap.h"
  39 #include "cache.h"
  40 #include "xdr4.h"
  41 #include "vfs.h"
  42 #include "current_stateid.h"
  43 #include "netns.h"
  44
  45 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  46
  47 static u32 nfsd_attrmask[] = {
  48         NFSD_WRITEABLE_ATTRS_WORD0,
  49         NFSD_WRITEABLE_ATTRS_WORD1,
  50         NFSD_WRITEABLE_ATTRS_WORD2
  51 };
  52
  53 static u32 nfsd41_ex_attrmask[] = {
  54         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  55         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  56         NFSD_SUPPATTR_EXCLCREAT_WORD2
  57 };
  58
  59 static __be32
  60 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  61                    u32 *bmval, u32 *writable)
  62 {
  63         struct dentry *dentry = cstate->current_fh.fh_dentry;
  64
  65         /*
  66          * Check about attributes are supported by the NFSv4 server or not.
  67          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  68          */
  69         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
  70             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
  71             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
  72                 return nfserr_attrnotsupp;
  73
  74         /*
  75          * Check FATTR4_WORD0_ACL can be supported
  76          * in current environment or not.
  77          */
  78         if (bmval[0] & FATTR4_WORD0_ACL) {
  79                 if (!IS_POSIXACL(dentry->d_inode))
  80                         return nfserr_attrnotsupp;
  81         }
  82
  83         /*
  84          * According to spec, read-only attributes return ERR_INVAL.
  85          */
  86         if (writable) {
  87                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
  88                     (bmval[2] & ~writable[2]))
  89                         return nfserr_inval;
  90         }
  91
  92         return nfs_ok;
  93 }
  94
  95 static __be32
  96 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
  97         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
  98 {
  99         __be32 status = nfs_ok;
 100
 101         if (open->op_create == NFS4_OPEN_CREATE) {
 102                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 103                     || open->op_createmode == NFS4_CREATE_GUARDED)
 104                         status = check_attr_support(rqstp, cstate,
 105                                         open->op_bmval, nfsd_attrmask);
 106                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 107                         status = check_attr_support(rqstp, cstate,
 108                                         open->op_bmval, nfsd41_ex_attrmask);
 109         }
 110
 111         return status;
 112 }
 113
 114 static int
 115 is_create_with_attrs(struct nfsd4_open *open)
 116 {
 117         return open->op_create == NFS4_OPEN_CREATE
 118                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 119                     || open->op_createmode == NFS4_CREATE_GUARDED
 120                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 121 }
 122
 123 /*
 124  * if error occurs when setting the acl, just clear the acl bit
 125  * in the returned attr bitmap.
 126  */
 127 static void
 128 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 129                 struct nfs4_acl *acl, u32 *bmval)
 130 {
 131         __be32 status;
 132
 133         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 134         if (status)
 135                 /*
 136                  * We should probably fail the whole open at this point,
 137                  * but we've already created the file, so it's too late;
 138                  * So this seems the least of evils:
 139                  */
 140                 bmval[0] &= ~FATTR4_WORD0_ACL;
 141 }
 142
 143 static inline void
 144 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 145 {
 146         fh_put(dst);
 147         dget(src->fh_dentry);
 148         if (src->fh_export)
 149                 cache_get(&src->fh_export->h);
 150         *dst = *src;
 151 }
 152
 153 static __be32
 154 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 155 {
 156         __be32 status;
 157
 158         if (open->op_truncate &&
 159                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 160                 return nfserr_inval;
 161
 162         accmode |= NFSD_MAY_READ_IF_EXEC;
 163
 164         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 165                 accmode |= NFSD_MAY_READ;
 166         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 167                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 168         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 169                 accmode |= NFSD_MAY_WRITE;
 170
 171         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 172
 173         return status;
 174 }
 175
 176 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 177 {
 178         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 179
 180         if (S_ISREG(mode))
 181                 return nfs_ok;
 182         if (S_ISDIR(mode))
 183                 return nfserr_isdir;
 184         /*
 185          * Using err_symlink as our catch-all case may look odd; but
 186          * there's no other obvious error for this case in 4.0, and we
 187          * happen to know that it will cause the linux v4 client to do
 188          * the right thing on attempts to open something other than a
 189          * regular file.
 190          */
 191         return nfserr_symlink;
 192 }
 193
 194 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 195 {
 196         if (nfsd4_has_session(cstate))
 197                 return;
 198         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 199                         &resfh->fh_handle);
 200 }
 201
 202 static __be32
 203 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 204 {
 205         struct svc_fh *current_fh = &cstate->current_fh;
 206         struct svc_fh *resfh;
 207         int accmode;
 208         __be32 status;
 209
 210         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 211         if (!resfh)
 212                 return nfserr_jukebox;
 213         fh_init(resfh, NFS4_FHSIZE);
 214         open->op_truncate = 0;
 215
 216         if (open->op_create) {
 217                 /* FIXME: check session persistence and pnfs flags.
 218                  * The nfsv4.1 spec requires the following semantics:
 219                  *
 220                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 221                  * Reply Cache  | server |                 |
 222                  * -------------+--------+-----------------+--------------------
 223                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 224                  *              |        |                 | (SHOULD)
 225                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 226                  *              |        |                 | (SHOULD NOT)
 227                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 228                  * yes          | no     | GUARDED4        | GUARDED4
 229                  * yes          | yes    | GUARDED4        | GUARDED4
 230                  */
 231
 232                 /*
 233                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 234                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 235                  */
 236                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 237                                         open->op_fname.len, &open->op_iattr,
 238                                         resfh, open->op_createmode,
 239                                         (u32 *)open->op_verf.data,
 240                                         &open->op_truncate, &open->op_created);
 241
 242                 /*
 243                  * Following rfc 3530 14.2.16, use the returned bitmask
 244                  * to indicate which attributes we used to store the
 245                  * verifier:
 246                  */
 247                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 248                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 249                                                         FATTR4_WORD1_TIME_MODIFY);
 250         } else {
 251                 status = nfsd_lookup(rqstp, current_fh,
 252                                      open->op_fname.data, open->op_fname.len, resfh);
 253                 fh_unlock(current_fh);
 254         }
 255         if (status)
 256                 goto out;
 257         status = nfsd_check_obj_isreg(resfh);
 258         if (status)
 259                 goto out;
 260
 261         if (is_create_with_attrs(open) && open->op_acl != NULL)
 262                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 263
 264         nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
 265         accmode = NFSD_MAY_NOP;
 266         if (open->op_created)
 267                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 268         status = do_open_permission(rqstp, resfh, open, accmode);
 269         set_change_info(&open->op_cinfo, current_fh);
 270         fh_dup2(current_fh, resfh);
 271 out:
 272         fh_put(resfh);
 273         kfree(resfh);
 274         return status;
 275 }
 276
 277 static __be32
 278 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 279 {
 280         struct svc_fh *current_fh = &cstate->current_fh;
 281         __be32 status;
 282         int accmode = 0;
 283
 284         /* We don't know the target directory, and therefore can not
 285         * set the change info
 286         */
 287
 288         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 289
 290         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 291
 292         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 293                 (open->op_iattr.ia_size == 0);
 294         /*
 295          * In the delegation case, the client is telling us about an
 296          * open that it *already* performed locally, some time ago.  We
 297          * should let it succeed now if possible.
 298          *
 299          * In the case of a CLAIM_FH open, on the other hand, the client
 300          * may be counting on us to enforce permissions (the Linux 4.1
 301          * client uses this for normal opens, for example).
 302          */
 303         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 304                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 305
 306         status = do_open_permission(rqstp, current_fh, open, accmode);
 307
 308         return status;
 309 }
 310
 311 static void
 312 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 313 {
 314         struct nfsd4_sessionid *sid =
 315                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 316
 317         clid->cl_boot = sid->clientid.cl_boot;
 318         clid->cl_id = sid->clientid.cl_id;
 319 }
 320
 321 static __be32
 322 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 323            struct nfsd4_open *open)
 324 {
 325         __be32 status;
 326         struct nfsd4_compoundres *resp;
 327         struct net *net = SVC_NET(rqstp);
 328         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 329
 330         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 331                 (int)open->op_fname.len, open->op_fname.data,
 332                 open->op_openowner);
 333
 334         /* This check required by spec. */
 335         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 336                 return nfserr_inval;
 337
 338         open->op_created = 0;
 339         /*
 340          * RFC5661 18.51.3
 341          * Before RECLAIM_COMPLETE done, server should deny new lock
 342          */
 343         if (nfsd4_has_session(cstate) &&
 344             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 345                       &cstate->session->se_client->cl_flags) &&
 346             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 347                 return nfserr_grace;
 348
 349         if (nfsd4_has_session(cstate))
 350                 copy_clientid(&open->op_clientid, cstate->session);
 351
 352         nfs4_lock_state();
 353
 354         /* check seqid for replay. set nfs4_owner */
 355         resp = rqstp->rq_resp;
 356         status = nfsd4_process_open1(&resp->cstate, open, nn);
 357         if (status == nfserr_replay_me) {
 358                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 359                 fh_put(&cstate->current_fh);
 360                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 361                                 &rp->rp_openfh);
 362                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 363                 if (status)
 364                         dprintk("nfsd4_open: replay failed"
 365                                 " restoring previous filehandle\n");
 366                 else
 367                         status = nfserr_replay_me;
 368         }
 369         if (status)
 370                 goto out;
 371         if (open->op_xdr_error) {
 372                 status = open->op_xdr_error;
 373                 goto out;
 374         }
 375
 376         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 377         if (status)
 378                 goto out;
 379
 380         /* Openowner is now set, so sequence id will get bumped.  Now we need
 381          * these checks before we do any creates: */
 382         status = nfserr_grace;
 383         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 384                 goto out;
 385         status = nfserr_no_grace;
 386         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 387                 goto out;
 388
 389         switch (open->op_claim_type) {
 390                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 391                 case NFS4_OPEN_CLAIM_NULL:
 392                         status = do_open_lookup(rqstp, cstate, open);
 393                         if (status)
 394                                 goto out;
 395                         break;
 396                 case NFS4_OPEN_CLAIM_PREVIOUS:
 397                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 398                         status = nfs4_check_open_reclaim(&open->op_clientid,
 399                                                          cstate->minorversion,
 400                                                          nn);
 401                         if (status)
 402                                 goto out;
 403                 case NFS4_OPEN_CLAIM_FH:
 404                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 405                         status = do_open_fhandle(rqstp, cstate, open);
 406                         if (status)
 407                                 goto out;
 408                         break;
 409                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 410                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 411                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 412                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 413                                 open->op_claim_type);
 414                         status = nfserr_notsupp;
 415                         goto out;
 416                 default:
 417                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 418                                 open->op_claim_type);
 419                         status = nfserr_inval;
 420                         goto out;
 421         }
 422         /*
 423          * nfsd4_process_open2() does the actual opening of the file.  If
 424          * successful, it (1) truncates the file if open->op_truncate was
 425          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 426          */
 427         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 428         WARN_ON(status && open->op_created);
 429 out:
 430         nfsd4_cleanup_open_state(open, status);
 431         if (open->op_openowner && !nfsd4_has_session(cstate))
 432                 cstate->replay_owner = &open->op_openowner->oo_owner;
 433         nfsd4_bump_seqid(cstate, status);
 434         if (!cstate->replay_owner)
 435                 nfs4_unlock_state();
 436         return status;
 437 }
 438
 439 /*
 440  * OPEN is the only seqid-mutating operation whose decoding can fail
 441  * with a seqid-mutating error (specifically, decoding of user names in
 442  * the attributes).  Therefore we have to do some processing to look up
 443  * the stateowner so that we can bump the seqid.
 444  */
 445 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 446 {
 447         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 448
 449         if (!seqid_mutating_err(ntohl(op->status)))
 450                 return op->status;
 451         if (nfsd4_has_session(cstate))
 452                 return op->status;
 453         open->op_xdr_error = op->status;
 454         return nfsd4_open(rqstp, cstate, open);
 455 }
 456
 457 /*
 458  * filehandle-manipulating ops.
 459  */
 460 static __be32
 461 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 462             struct svc_fh **getfh)
 463 {
 464         if (!cstate->current_fh.fh_dentry)
 465                 return nfserr_nofilehandle;
 466
 467         *getfh = &cstate->current_fh;
 468         return nfs_ok;
 469 }
 470
 471 static __be32
 472 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 473             struct nfsd4_putfh *putfh)
 474 {
 475         fh_put(&cstate->current_fh);
 476         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 477         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 478                putfh->pf_fhlen);
 479         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 480 }
 481
 482 static __be32
 483 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 484                 void *arg)
 485 {
 486         __be32 status;
 487
 488         fh_put(&cstate->current_fh);
 489         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 490         return status;
 491 }
 492
 493 static __be32
 494 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 495                 void *arg)
 496 {
 497         if (!cstate->save_fh.fh_dentry)
 498                 return nfserr_restorefh;
 499
 500         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 501         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 502                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 503                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 504         }
 505         return nfs_ok;
 506 }
 507
 508 static __be32
 509 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510              void *arg)
 511 {
 512         if (!cstate->current_fh.fh_dentry)
 513                 return nfserr_nofilehandle;
 514
 515         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 516         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 517                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 518                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 519         }
 520         return nfs_ok;
 521 }
 522
 523 /*
 524  * misc nfsv4 ops
 525  */
 526 static __be32
 527 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 528              struct nfsd4_access *access)
 529 {
 530         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 531                 return nfserr_inval;
 532
 533         access->ac_resp_access = access->ac_req_access;
 534         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 535                            &access->ac_supported);
 536 }
 537
 538 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 539 {
 540         __be32 verf[2];
 541         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 542
 543         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 544         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 545         memcpy(verifier->data, verf, sizeof(verifier->data));
 546 }
 547
 548 static __be32
 549 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 550              struct nfsd4_commit *commit)
 551 {
 552         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 553         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 554                              commit->co_count);
 555 }
 556
 557 static __be32
 558 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 559              struct nfsd4_create *create)
 560 {
 561         struct svc_fh resfh;
 562         __be32 status;
 563         dev_t rdev;
 564
 565         fh_init(&resfh, NFS4_FHSIZE);
 566
 567         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 568                            NFSD_MAY_CREATE);
 569         if (status)
 570                 return status;
 571
 572         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 573                                     nfsd_attrmask);
 574         if (status)
 575                 return status;
 576
 577         switch (create->cr_type) {
 578         case NF4LNK:
 579                 /* ugh! we have to null-terminate the linktext, or
 580                  * vfs_symlink() will choke.  it is always safe to
 581                  * null-terminate by brute force, since at worst we
 582                  * will overwrite the first byte of the create namelen
 583                  * in the XDR buffer, which has already been extracted
 584                  * during XDR decode.
 585                  */
 586                 create->cr_linkname[create->cr_linklen] = 0;
 587
 588                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 589                                       create->cr_name, create->cr_namelen,
 590                                       create->cr_linkname, create->cr_linklen,
 591                                       &resfh, &create->cr_iattr);
 592                 break;
 593
 594         case NF4BLK:
 595                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 596                 if (MAJOR(rdev) != create->cr_specdata1 ||
 597                     MINOR(rdev) != create->cr_specdata2)
 598                         return nfserr_inval;
 599                 status = nfsd_create(rqstp, &cstate->current_fh,
 600                                      create->cr_name, create->cr_namelen,
 601                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 602                 break;
 603
 604         case NF4CHR:
 605                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 606                 if (MAJOR(rdev) != create->cr_specdata1 ||
 607                     MINOR(rdev) != create->cr_specdata2)
 608                         return nfserr_inval;
 609                 status = nfsd_create(rqstp, &cstate->current_fh,
 610                                      create->cr_name, create->cr_namelen,
 611                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 612                 break;
 613
 614         case NF4SOCK:
 615                 status = nfsd_create(rqstp, &cstate->current_fh,
 616                                      create->cr_name, create->cr_namelen,
 617                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 618                 break;
 619
 620         case NF4FIFO:
 621                 status = nfsd_create(rqstp, &cstate->current_fh,
 622                                      create->cr_name, create->cr_namelen,
 623                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 624                 break;
 625
 626         case NF4DIR:
 627                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 628                 status = nfsd_create(rqstp, &cstate->current_fh,
 629                                      create->cr_name, create->cr_namelen,
 630                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 631                 break;
 632
 633         default:
 634                 status = nfserr_badtype;
 635         }
 636
 637         if (status)
 638                 goto out;
 639
 640         if (create->cr_acl != NULL)
 641                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 642                                 create->cr_bmval);
 643
 644         fh_unlock(&cstate->current_fh);
 645         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 646         fh_dup2(&cstate->current_fh, &resfh);
 647 out:
 648         fh_put(&resfh);
 649         return status;
 650 }
 651
 652 static __be32
 653 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 654               struct nfsd4_getattr *getattr)
 655 {
 656         __be32 status;
 657
 658         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 659         if (status)
 660                 return status;
 661
 662         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 663                 return nfserr_inval;
 664
 665         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 666         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 667         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 668
 669         getattr->ga_fhp = &cstate->current_fh;
 670         return nfs_ok;
 671 }
 672
 673 static __be32
 674 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 675            struct nfsd4_link *link)
 676 {
 677         __be32 status = nfserr_nofilehandle;
 678
 679         if (!cstate->save_fh.fh_dentry)
 680                 return status;
 681         status = nfsd_link(rqstp, &cstate->current_fh,
 682                            link->li_name, link->li_namelen, &cstate->save_fh);
 683         if (!status)
 684                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 685         return status;
 686 }
 687
 688 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 689 {
 690         struct svc_fh tmp_fh;
 691         __be32 ret;
 692
 693         fh_init(&tmp_fh, NFS4_FHSIZE);
 694         ret = exp_pseudoroot(rqstp, &tmp_fh);
 695         if (ret)
 696                 return ret;
 697         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 698                 fh_put(&tmp_fh);
 699                 return nfserr_noent;
 700         }
 701         fh_put(&tmp_fh);
 702         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 703 }
 704
 705 static __be32
 706 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 707               void *arg)
 708 {
 709         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 710 }
 711
 712 static __be32
 713 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 714              struct nfsd4_lookup *lookup)
 715 {
 716         return nfsd_lookup(rqstp, &cstate->current_fh,
 717                            lookup->lo_name, lookup->lo_len,
 718                            &cstate->current_fh);
 719 }
 720
 721 static __be32
 722 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 723            struct nfsd4_read *read)
 724 {
 725         __be32 status;
 726
 727         /* no need to check permission - this will be done in nfsd_read() */
 728
 729         read->rd_filp = NULL;
 730         if (read->rd_offset >= OFFSET_MAX)
 731                 return nfserr_inval;
 732
 733         /*
 734          * If we do a zero copy read, then a client will see read data
 735          * that reflects the state of the file *after* performing the
 736          * following compound.
 737          *
 738          * To ensure proper ordering, we therefore turn off zero copy if
 739          * the client wants us to do more in this compound:
 740          */
 741         if (!nfsd4_last_compound_op(rqstp))
 742                 rqstp->rq_splice_ok = false;
 743
 744         nfs4_lock_state();
 745         /* check stateid */
 746         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 747                                                  cstate, &read->rd_stateid,
 748                                                  RD_STATE, &read->rd_filp))) {
 749                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 750                 goto out;
 751         }
 752         if (read->rd_filp)
 753                 get_file(read->rd_filp);
 754         status = nfs_ok;
 755 out:
 756         nfs4_unlock_state();
 757         read->rd_rqstp = rqstp;
 758         read->rd_fhp = &cstate->current_fh;
 759         return status;
 760 }
 761
 762 static __be32
 763 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 764               struct nfsd4_readdir *readdir)
 765 {
 766         u64 cookie = readdir->rd_cookie;
 767         static const nfs4_verifier zeroverf;
 768
 769         /* no need to check permission - this will be done in nfsd_readdir() */
 770
 771         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 772                 return nfserr_inval;
 773
 774         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 775         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 776         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 777
 778         if ((cookie == 1) || (cookie == 2) ||
 779             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 780                 return nfserr_bad_cookie;
 781
 782         readdir->rd_rqstp = rqstp;
 783         readdir->rd_fhp = &cstate->current_fh;
 784         return nfs_ok;
 785 }
 786
 787 static __be32
 788 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 789                struct nfsd4_readlink *readlink)
 790 {
 791         readlink->rl_rqstp = rqstp;
 792         readlink->rl_fhp = &cstate->current_fh;
 793         return nfs_ok;
 794 }
 795
 796 static __be32
 797 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 798              struct nfsd4_remove *remove)
 799 {
 800         __be32 status;
 801
 802         if (locks_in_grace(SVC_NET(rqstp)))
 803                 return nfserr_grace;
 804         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 805                              remove->rm_name, remove->rm_namelen);
 806         if (!status) {
 807                 fh_unlock(&cstate->current_fh);
 808                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 809         }
 810         return status;
 811 }
 812
 813 static __be32
 814 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 815              struct nfsd4_rename *rename)
 816 {
 817         __be32 status = nfserr_nofilehandle;
 818
 819         if (!cstate->save_fh.fh_dentry)
 820                 return status;
 821         if (locks_in_grace(SVC_NET(rqstp)) &&
 822                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 823                 return nfserr_grace;
 824         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 825                              rename->rn_snamelen, &cstate->current_fh,
 826                              rename->rn_tname, rename->rn_tnamelen);
 827         if (status)
 828                 return status;
 829         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 830         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 831         return nfs_ok;
 832 }
 833
 834 static __be32
 835 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 836               struct nfsd4_secinfo *secinfo)
 837 {
 838         struct svc_fh resfh;
 839         struct svc_export *exp;
 840         struct dentry *dentry;
 841         __be32 err;
 842
 843         fh_init(&resfh, NFS4_FHSIZE);
 844         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 845         if (err)
 846                 return err;
 847         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 848                                     secinfo->si_name, secinfo->si_namelen,
 849                                     &exp, &dentry);
 850         if (err)
 851                 return err;
 852         if (dentry->d_inode == NULL) {
 853                 exp_put(exp);
 854                 err = nfserr_noent;
 855         } else
 856                 secinfo->si_exp = exp;
 857         dput(dentry);
 858         if (cstate->minorversion)
 859                 /* See rfc 5661 section 2.6.3.1.1.8 */
 860                 fh_put(&cstate->current_fh);
 861         return err;
 862 }
 863
 864 static __be32
 865 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 866               struct nfsd4_secinfo_no_name *sin)
 867 {
 868         __be32 err;
 869
 870         switch (sin->sin_style) {
 871         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 872                 break;
 873         case NFS4_SECINFO_STYLE4_PARENT:
 874                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 875                 if (err)
 876                         return err;
 877                 break;
 878         default:
 879                 return nfserr_inval;
 880         }
 881         exp_get(cstate->current_fh.fh_export);
 882         sin->sin_exp = cstate->current_fh.fh_export;
 883         fh_put(&cstate->current_fh);
 884         return nfs_ok;
 885 }
 886
 887 static __be32
 888 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 889               struct nfsd4_setattr *setattr)
 890 {
 891         __be32 status = nfs_ok;
 892         int err;
 893
 894         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 895                 nfs4_lock_state();
 896                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 897                         &setattr->sa_stateid, WR_STATE, NULL);
 898                 nfs4_unlock_state();
 899                 if (status) {
 900                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 901                         return status;
 902                 }
 903         }
 904         err = fh_want_write(&cstate->current_fh);
 905         if (err)
 906                 return nfserrno(err);
 907         status = nfs_ok;
 908
 909         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 910                                     nfsd_attrmask);
 911         if (status)
 912                 goto out;
 913
 914         if (setattr->sa_acl != NULL)
 915                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 916                                             setattr->sa_acl);
 917         if (status)
 918                 goto out;
 919         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 920                                 0, (time_t)0);
 921 out:
 922         fh_drop_write(&cstate->current_fh);
 923         return status;
 924 }
 925
 926 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 927 {
 928         int i = 1;
 929         int buflen = write->wr_buflen;
 930
 931         vec[0].iov_base = write->wr_head.iov_base;
 932         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 933         buflen -= vec[0].iov_len;
 934
 935         while (buflen) {
 936                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 937                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 938                 buflen -= vec[i].iov_len;
 939                 i++;
 940         }
 941         return i;
 942 }
 943
 944 static __be32
 945 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 946             struct nfsd4_write *write)
 947 {
 948         stateid_t *stateid = &write->wr_stateid;
 949         struct file *filp = NULL;
 950         __be32 status = nfs_ok;
 951         unsigned long cnt;
 952         int nvecs;
 953
 954         /* no need to check permission - this will be done in nfsd_write() */
 955
 956         if (write->wr_offset >= OFFSET_MAX)
 957                 return nfserr_inval;
 958
 959         nfs4_lock_state();
 960         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 961                                         cstate, stateid, WR_STATE, &filp);
 962         if (status) {
 963                 nfs4_unlock_state();
 964                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 965                 return status;
 966         }
 967         if (filp)
 968                 get_file(filp);
 969         nfs4_unlock_state();
 970
 971         cnt = write->wr_buflen;
 972         write->wr_how_written = write->wr_stable_how;
 973         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 974
 975         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
 976         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 977
 978         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
 979                              write->wr_offset, rqstp->rq_vec, nvecs,
 980                              &cnt, &write->wr_how_written);
 981         if (filp)
 982                 fput(filp);
 983
 984         write->wr_bytes_written = cnt;
 985
 986         return status;
 987 }
 988
 989 /* This routine never returns NFS_OK!  If there are no other errors, it
 990  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
 991  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
 992  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
 993  */
 994 static __be32
 995 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 996              struct nfsd4_verify *verify)
 997 {
 998         __be32 *buf, *p;
 999         int count;
1000         __be32 status;
1001
1002         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1003         if (status)
1004                 return status;
1005
1006         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1007         if (status)
1008                 return status;
1009
1010         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1011             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1012                 return nfserr_inval;
1013         if (verify->ve_attrlen & 3)
1014                 return nfserr_inval;
1015
1016         /* count in words:
1017          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1018          */
1019         count = 4 + (verify->ve_attrlen >> 2);
1020         buf = kmalloc(count << 2, GFP_KERNEL);
1021         if (!buf)
1022                 return nfserr_jukebox;
1023
1024         p = buf;
1025         status = nfsd4_encode_fattr(&cstate->current_fh,
1026                                     cstate->current_fh.fh_export,
1027                                     cstate->current_fh.fh_dentry, &p,
1028                                     count, verify->ve_bmval,
1029                                     rqstp, 0);
1030
1031         /* this means that nfsd4_encode_fattr() ran out of space */
1032         if (status == nfserr_resource)
1033                 status = nfserr_not_same;
1034         if (status)
1035                 goto out_kfree;
1036
1037         /* skip bitmap */
1038         p = buf + 1 + ntohl(buf[0]);
1039         status = nfserr_not_same;
1040         if (ntohl(*p++) != verify->ve_attrlen)
1041                 goto out_kfree;
1042         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1043                 status = nfserr_same;
1044
1045 out_kfree:
1046         kfree(buf);
1047         return status;
1048 }
1049
1050 static __be32
1051 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1052               struct nfsd4_verify *verify)
1053 {
1054         __be32 status;
1055
1056         status = _nfsd4_verify(rqstp, cstate, verify);
1057         return status == nfserr_not_same ? nfs_ok : status;
1058 }
1059
1060 static __be32
1061 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1062              struct nfsd4_verify *verify)
1063 {
1064         __be32 status;
1065
1066         status = _nfsd4_verify(rqstp, cstate, verify);
1067         return status == nfserr_same ? nfs_ok : status;
1068 }
1069
1070 /*
1071  * NULL call.
1072  */
1073 static __be32
1074 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1075 {
1076         return nfs_ok;
1077 }
1078
1079 static inline void nfsd4_increment_op_stats(u32 opnum)
1080 {
1081         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1082                 nfsdstats.nfs4_opcount[opnum]++;
1083 }
1084
1085 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1086                               void *);
1087 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1088 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1089 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1090
1091 enum nfsd4_op_flags {
1092         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1093         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1094         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1095         /* For rfc 5661 section 2.6.3.1.1: */
1096         OP_HANDLES_WRONGSEC = 1 << 3,
1097         OP_IS_PUTFH_LIKE = 1 << 4,
1098         /*
1099          * These are the ops whose result size we estimate before
1100          * encoding, to avoid performing an op then not being able to
1101          * respond or cache a response.  This includes writes and setattrs
1102          * as well as the operations usually called "nonidempotent":
1103          */
1104         OP_MODIFIES_SOMETHING = 1 << 5,
1105         /*
1106          * Cache compounds containing these ops in the xid-based drc:
1107          * We use the DRC for compounds containing non-idempotent
1108          * operations, *except* those that are 4.1-specific (since
1109          * sessions provide their own EOS), and except for stateful
1110          * operations other than setclientid and setclientid_confirm
1111          * (since sequence numbers provide EOS for open, lock, etc in
1112          * the v4.0 case).
1113          */
1114         OP_CACHEME = 1 << 6,
1115         /*
1116          * These are ops which clear current state id.
1117          */
1118         OP_CLEAR_STATEID = 1 << 7,
1119 };
1120
1121 struct nfsd4_operation {
1122         nfsd4op_func op_func;
1123         u32 op_flags;
1124         char *op_name;
1125         /* Try to get response size before operation */
1126         nfsd4op_rsize op_rsize_bop;
1127         stateid_getter op_get_currentstateid;
1128         stateid_setter op_set_currentstateid;
1129 };
1130
1131 static struct nfsd4_operation nfsd4_ops[];
1132
1133 #ifdef NFSD_DEBUG
1134 static const char *nfsd4_op_name(unsigned opnum);
1135 #endif
1136
1137 /*
1138  * Enforce NFSv4.1 COMPOUND ordering rules:
1139  *
1140  * Also note, enforced elsewhere:
1141  *      - SEQUENCE other than as first op results in
1142  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1143  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1144  *        (Enforced in nfsd4_bind_conn_to_session().)
1145  *      - DESTROY_SESSION must be the final operation in a compound, if
1146  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1147  *        (Enforced in nfsd4_destroy_session().)
1148  */
1149 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1150 {
1151         struct nfsd4_op *op = &args->ops[0];
1152
1153         /* These ordering requirements don't apply to NFSv4.0: */
1154         if (args->minorversion == 0)
1155                 return nfs_ok;
1156         /* This is weird, but OK, not our problem: */
1157         if (args->opcnt == 0)
1158                 return nfs_ok;
1159         if (op->status == nfserr_op_illegal)
1160                 return nfs_ok;
1161         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1162                 return nfserr_op_not_in_session;
1163         if (op->opnum == OP_SEQUENCE)
1164                 return nfs_ok;
1165         if (args->opcnt != 1)
1166                 return nfserr_not_only_op;
1167         return nfs_ok;
1168 }
1169
1170 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1171 {
1172         return &nfsd4_ops[op->opnum];
1173 }
1174
1175 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1176 {
1177         return OPDESC(op)->op_flags & OP_CACHEME;
1178 }
1179
1180 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1181 {
1182         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1183         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1184         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1185         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1186         struct nfsd4_operation *thisd;
1187         struct nfsd4_operation *nextd;
1188
1189         thisd = OPDESC(this);
1190         /*
1191          * Most ops check wronsec on our own; only the putfh-like ops
1192          * have special rules.
1193          */
1194         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1195                 return false;
1196         /*
1197          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1198          * put-filehandle operation if we're not going to use the
1199          * result:
1200          */
1201         if (argp->opcnt == resp->opcnt)
1202                 return false;
1203
1204         nextd = OPDESC(next);
1205         /*
1206          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1207          * errors themselves as necessary; others should check for them
1208          * now:
1209          */
1210         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1211 }
1212
1213 /*
1214  * COMPOUND call.
1215  */
1216 static __be32
1217 nfsd4_proc_compound(struct svc_rqst *rqstp,
1218                     struct nfsd4_compoundargs *args,
1219                     struct nfsd4_compoundres *resp)
1220 {
1221         struct nfsd4_op *op;
1222         struct nfsd4_operation *opdesc;
1223         struct nfsd4_compound_state *cstate = &resp->cstate;
1224         int             slack_bytes;
1225         u32             plen = 0;
1226         __be32          status;
1227
1228         resp->xbuf = &rqstp->rq_res;
1229         resp->p = rqstp->rq_res.head[0].iov_base +
1230                                                 rqstp->rq_res.head[0].iov_len;
1231         resp->tagp = resp->p;
1232         /* reserve space for: taglen, tag, and opcnt */
1233         resp->p += 2 + XDR_QUADLEN(args->taglen);
1234         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1235         resp->taglen = args->taglen;
1236         resp->tag = args->tag;
1237         resp->opcnt = 0;
1238         resp->rqstp = rqstp;
1239         resp->cstate.minorversion = args->minorversion;
1240         resp->cstate.replay_owner = NULL;
1241         resp->cstate.session = NULL;
1242         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1243         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1244         /*
1245          * Don't use the deferral mechanism for NFSv4; compounds make it
1246          * too hard to avoid non-idempotency problems.
1247          */
1248         rqstp->rq_usedeferral = 0;
1249
1250         /*
1251          * According to RFC3010, this takes precedence over all other errors.
1252          */
1253         status = nfserr_minor_vers_mismatch;
1254         if (args->minorversion > nfsd_supported_minorversion)
1255                 goto out;
1256
1257         status = nfs41_check_op_ordering(args);
1258         if (status) {
1259                 op = &args->ops[0];
1260                 op->status = status;
1261                 goto encode_op;
1262         }
1263
1264         while (!status && resp->opcnt < args->opcnt) {
1265                 op = &args->ops[resp->opcnt++];
1266
1267                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1268                         resp->opcnt, args->opcnt, op->opnum,
1269                         nfsd4_op_name(op->opnum));
1270                 /*
1271                  * The XDR decode routines may have pre-set op->status;
1272                  * for example, if there is a miscellaneous XDR error
1273                  * it will be set to nfserr_bad_xdr.
1274                  */
1275                 if (op->status) {
1276                         if (op->opnum == OP_OPEN)
1277                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1278                         goto encode_op;
1279                 }
1280
1281                 /* We must be able to encode a successful response to
1282                  * this operation, with enough room left over to encode a
1283                  * failed response to the next operation.  If we don't
1284                  * have enough room, fail with ERR_RESOURCE.
1285                  */
1286                 slack_bytes = (char *)resp->end - (char *)resp->p;
1287                 if (slack_bytes < COMPOUND_SLACK_SPACE
1288                                 + COMPOUND_ERR_SLACK_SPACE) {
1289                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1290                         op->status = nfserr_resource;
1291                         goto encode_op;
1292                 }
1293
1294                 opdesc = OPDESC(op);
1295
1296                 if (!cstate->current_fh.fh_dentry) {
1297                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1298                                 op->status = nfserr_nofilehandle;
1299                                 goto encode_op;
1300                         }
1301                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1302                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1303                         op->status = nfserr_moved;
1304                         goto encode_op;
1305                 }
1306
1307                 /* If op is non-idempotent */
1308                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1309                         plen = opdesc->op_rsize_bop(rqstp, op);
1310                         op->status = nfsd4_check_resp_size(resp, plen);
1311                 }
1312
1313                 if (op->status)
1314                         goto encode_op;
1315
1316                 if (opdesc->op_get_currentstateid)
1317                         opdesc->op_get_currentstateid(cstate, &op->u);
1318                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1319
1320                 if (!op->status) {
1321                         if (opdesc->op_set_currentstateid)
1322                                 opdesc->op_set_currentstateid(cstate, &op->u);
1323
1324                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1325                                 clear_current_stateid(cstate);
1326
1327                         if (need_wrongsec_check(rqstp))
1328                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1329                 }
1330
1331 encode_op:
1332                 /* Only from SEQUENCE */
1333                 if (resp->cstate.status == nfserr_replay_cache) {
1334                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1335                         status = op->status;
1336                         goto out;
1337                 }
1338                 if (op->status == nfserr_replay_me) {
1339                         op->replay = &cstate->replay_owner->so_replay;
1340                         nfsd4_encode_replay(resp, op);
1341                         status = op->status = op->replay->rp_status;
1342                 } else {
1343                         nfsd4_encode_operation(resp, op);
1344                         status = op->status;
1345                 }
1346
1347                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1348                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1349                         be32_to_cpu(status));
1350
1351                 if (cstate->replay_owner) {
1352                         nfs4_unlock_state();
1353                         cstate->replay_owner = NULL;
1354                 }
1355                 /* XXX Ugh, we need to get rid of this kind of special case: */
1356                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1357                         fput(op->u.read.rd_filp);
1358
1359                 nfsd4_increment_op_stats(op->opnum);
1360         }
1361
1362         resp->cstate.status = status;
1363         fh_put(&resp->cstate.current_fh);
1364         fh_put(&resp->cstate.save_fh);
1365         BUG_ON(resp->cstate.replay_owner);
1366 out:
1367         /* Reset deferral mechanism for RPC deferrals */
1368         rqstp->rq_usedeferral = 1;
1369         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1370         return status;
1371 }
1372
1373 #define op_encode_hdr_size              (2)
1374 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1375 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1376 #define op_encode_change_info_maxsz     (5)
1377 #define nfs4_fattr_bitmap_maxsz         (4)
1378
1379 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1380 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1381
1382 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1383
1384 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1385 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1386                                          op_encode_ace_maxsz)
1387
1388 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1389
1390 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1391 {
1392         return (op_encode_hdr_size) * sizeof(__be32);
1393 }
1394
1395 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1396 {
1397         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1398 }
1399
1400 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1401 {
1402         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1403 }
1404
1405 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1406 {
1407         return (op_encode_hdr_size + op_encode_change_info_maxsz
1408                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1409 }
1410
1411 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1412 {
1413         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1414                 * sizeof(__be32);
1415 }
1416
1417 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1418 {
1419         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1420                 * sizeof(__be32);
1421 }
1422
1423 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1424 {
1425         return (op_encode_hdr_size + op_encode_stateid_maxsz
1426                 + op_encode_change_info_maxsz + 1
1427                 + nfs4_fattr_bitmap_maxsz
1428                 + op_encode_delegation_maxsz) * sizeof(__be32);
1429 }
1430
1431 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1432 {
1433         u32 maxcount = 0, rlen = 0;
1434
1435         maxcount = svc_max_payload(rqstp);
1436         rlen = op->u.read.rd_length;
1437
1438         if (rlen > maxcount)
1439                 rlen = maxcount;
1440
1441         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1442 }
1443
1444 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1445 {
1446         u32 rlen = op->u.readdir.rd_maxcount;
1447
1448         if (rlen > PAGE_SIZE)
1449                 rlen = PAGE_SIZE;
1450
1451         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1452                  * sizeof(__be32) + rlen;
1453 }
1454
1455 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1456 {
1457         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1458                 * sizeof(__be32);
1459 }
1460
1461 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1462 {
1463         return (op_encode_hdr_size + op_encode_change_info_maxsz
1464                 + op_encode_change_info_maxsz) * sizeof(__be32);
1465 }
1466
1467 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1468 {
1469         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1470 }
1471
1472 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1473 {
1474         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1475 }
1476
1477 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1478 {
1479         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1480 }
1481
1482 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1483 {
1484         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1485                 1 + 1 + 0 + /* eir_flags, spr_how, SP4_NONE (for now) */\
1486                 2 + /*eir_server_owner.so_minor_id */\
1487                 /* eir_server_owner.so_major_id<> */\
1488                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1489                 /* eir_server_scope<> */\
1490                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1491                 1 + /* eir_server_impl_id array length */\
1492                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1493 }
1494
1495 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1496 {
1497         return (op_encode_hdr_size + \
1498                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1499                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1500 }
1501
1502 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1503 {
1504         return (op_encode_hdr_size + \
1505                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1506                 2 + /* csr_sequence, csr_flags */\
1507                 op_encode_channel_attrs_maxsz + \
1508                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1509 }
1510
1511 static struct nfsd4_operation nfsd4_ops[] = {
1512         [OP_ACCESS] = {
1513                 .op_func = (nfsd4op_func)nfsd4_access,
1514                 .op_name = "OP_ACCESS",
1515         },
1516         [OP_CLOSE] = {
1517                 .op_func = (nfsd4op_func)nfsd4_close,
1518                 .op_flags = OP_MODIFIES_SOMETHING,
1519                 .op_name = "OP_CLOSE",
1520                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1521                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1522                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1523         },
1524         [OP_COMMIT] = {
1525                 .op_func = (nfsd4op_func)nfsd4_commit,
1526                 .op_flags = OP_MODIFIES_SOMETHING,
1527                 .op_name = "OP_COMMIT",
1528                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1529         },
1530         [OP_CREATE] = {
1531                 .op_func = (nfsd4op_func)nfsd4_create,
1532                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1533                 .op_name = "OP_CREATE",
1534                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1535         },
1536         [OP_DELEGRETURN] = {
1537                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1538                 .op_flags = OP_MODIFIES_SOMETHING,
1539                 .op_name = "OP_DELEGRETURN",
1540                 .op_rsize_bop = nfsd4_only_status_rsize,
1541                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1542         },
1543         [OP_GETATTR] = {
1544                 .op_func = (nfsd4op_func)nfsd4_getattr,
1545                 .op_flags = ALLOWED_ON_ABSENT_FS,
1546                 .op_name = "OP_GETATTR",
1547         },
1548         [OP_GETFH] = {
1549                 .op_func = (nfsd4op_func)nfsd4_getfh,
1550                 .op_name = "OP_GETFH",
1551         },
1552         [OP_LINK] = {
1553                 .op_func = (nfsd4op_func)nfsd4_link,
1554                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1555                                 | OP_CACHEME,
1556                 .op_name = "OP_LINK",
1557                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1558         },
1559         [OP_LOCK] = {
1560                 .op_func = (nfsd4op_func)nfsd4_lock,
1561                 .op_flags = OP_MODIFIES_SOMETHING,
1562                 .op_name = "OP_LOCK",
1563                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1564                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1565         },
1566         [OP_LOCKT] = {
1567                 .op_func = (nfsd4op_func)nfsd4_lockt,
1568                 .op_name = "OP_LOCKT",
1569         },
1570         [OP_LOCKU] = {
1571                 .op_func = (nfsd4op_func)nfsd4_locku,
1572                 .op_flags = OP_MODIFIES_SOMETHING,
1573                 .op_name = "OP_LOCKU",
1574                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1575                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1576         },
1577         [OP_LOOKUP] = {
1578                 .op_func = (nfsd4op_func)nfsd4_lookup,
1579                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1580                 .op_name = "OP_LOOKUP",
1581         },
1582         [OP_LOOKUPP] = {
1583                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1584                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1585                 .op_name = "OP_LOOKUPP",
1586         },
1587         [OP_NVERIFY] = {
1588                 .op_func = (nfsd4op_func)nfsd4_nverify,
1589                 .op_name = "OP_NVERIFY",
1590         },
1591         [OP_OPEN] = {
1592                 .op_func = (nfsd4op_func)nfsd4_open,
1593                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1594                 .op_name = "OP_OPEN",
1595                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1596                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1597         },
1598         [OP_OPEN_CONFIRM] = {
1599                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1600                 .op_flags = OP_MODIFIES_SOMETHING,
1601                 .op_name = "OP_OPEN_CONFIRM",
1602                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1603         },
1604         [OP_OPEN_DOWNGRADE] = {
1605                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1606                 .op_flags = OP_MODIFIES_SOMETHING,
1607                 .op_name = "OP_OPEN_DOWNGRADE",
1608                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1609                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1610                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1611         },
1612         [OP_PUTFH] = {
1613                 .op_func = (nfsd4op_func)nfsd4_putfh,
1614                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1615                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1616                                 | OP_CLEAR_STATEID,
1617                 .op_name = "OP_PUTFH",
1618                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1619         },
1620         [OP_PUTPUBFH] = {
1621                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1622                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1623                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1624                                 | OP_CLEAR_STATEID,
1625                 .op_name = "OP_PUTPUBFH",
1626                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1627         },
1628         [OP_PUTROOTFH] = {
1629                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1630                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1631                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1632                                 | OP_CLEAR_STATEID,
1633                 .op_name = "OP_PUTROOTFH",
1634                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1635         },
1636         [OP_READ] = {
1637                 .op_func = (nfsd4op_func)nfsd4_read,
1638                 .op_flags = OP_MODIFIES_SOMETHING,
1639                 .op_name = "OP_READ",
1640                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1641                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1642         },
1643         [OP_READDIR] = {
1644                 .op_func = (nfsd4op_func)nfsd4_readdir,
1645                 .op_flags = OP_MODIFIES_SOMETHING,
1646                 .op_name = "OP_READDIR",
1647                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1648         },
1649         [OP_READLINK] = {
1650                 .op_func = (nfsd4op_func)nfsd4_readlink,
1651                 .op_name = "OP_READLINK",
1652         },
1653         [OP_REMOVE] = {
1654                 .op_func = (nfsd4op_func)nfsd4_remove,
1655                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1656                 .op_name = "OP_REMOVE",
1657                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1658         },
1659         [OP_RENAME] = {
1660                 .op_func = (nfsd4op_func)nfsd4_rename,
1661                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1662                 .op_name = "OP_RENAME",
1663                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1664         },
1665         [OP_RENEW] = {
1666                 .op_func = (nfsd4op_func)nfsd4_renew,
1667                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1668                                 | OP_MODIFIES_SOMETHING,
1669                 .op_name = "OP_RENEW",
1670                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1671
1672         },
1673         [OP_RESTOREFH] = {
1674                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1675                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1676                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1677                 .op_name = "OP_RESTOREFH",
1678                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1679         },
1680         [OP_SAVEFH] = {
1681                 .op_func = (nfsd4op_func)nfsd4_savefh,
1682                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1683                 .op_name = "OP_SAVEFH",
1684                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1685         },
1686         [OP_SECINFO] = {
1687                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1688                 .op_flags = OP_HANDLES_WRONGSEC,
1689                 .op_name = "OP_SECINFO",
1690         },
1691         [OP_SETATTR] = {
1692                 .op_func = (nfsd4op_func)nfsd4_setattr,
1693                 .op_name = "OP_SETATTR",
1694                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1695                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1696                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1697         },
1698         [OP_SETCLIENTID] = {
1699                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1700                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1701                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1702                 .op_name = "OP_SETCLIENTID",
1703                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1704         },
1705         [OP_SETCLIENTID_CONFIRM] = {
1706                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1707                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1708                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1709                 .op_name = "OP_SETCLIENTID_CONFIRM",
1710                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1711         },
1712         [OP_VERIFY] = {
1713                 .op_func = (nfsd4op_func)nfsd4_verify,
1714                 .op_name = "OP_VERIFY",
1715         },
1716         [OP_WRITE] = {
1717                 .op_func = (nfsd4op_func)nfsd4_write,
1718                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1719                 .op_name = "OP_WRITE",
1720                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1721                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1722         },
1723         [OP_RELEASE_LOCKOWNER] = {
1724                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1725                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1726                                 | OP_MODIFIES_SOMETHING,
1727                 .op_name = "OP_RELEASE_LOCKOWNER",
1728                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1729         },
1730
1731         /* NFSv4.1 operations */
1732         [OP_EXCHANGE_ID] = {
1733                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1734                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1735                                 | OP_MODIFIES_SOMETHING,
1736                 .op_name = "OP_EXCHANGE_ID",
1737                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1738         },
1739         [OP_BACKCHANNEL_CTL] = {
1740                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1741                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1742                 .op_name = "OP_BACKCHANNEL_CTL",
1743                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1744         },
1745         [OP_BIND_CONN_TO_SESSION] = {
1746                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1747                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1748                                 | OP_MODIFIES_SOMETHING,
1749                 .op_name = "OP_BIND_CONN_TO_SESSION",
1750                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1751         },
1752         [OP_CREATE_SESSION] = {
1753                 .op_func = (nfsd4op_func)nfsd4_create_session,
1754                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1755                                 | OP_MODIFIES_SOMETHING,
1756                 .op_name = "OP_CREATE_SESSION",
1757                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1758         },
1759         [OP_DESTROY_SESSION] = {
1760                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1761                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1762                                 | OP_MODIFIES_SOMETHING,
1763                 .op_name = "OP_DESTROY_SESSION",
1764                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1765         },
1766         [OP_SEQUENCE] = {
1767                 .op_func = (nfsd4op_func)nfsd4_sequence,
1768                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1769                 .op_name = "OP_SEQUENCE",
1770         },
1771         [OP_DESTROY_CLIENTID] = {
1772                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1773                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1774                                 | OP_MODIFIES_SOMETHING,
1775                 .op_name = "OP_DESTROY_CLIENTID",
1776                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1777         },
1778         [OP_RECLAIM_COMPLETE] = {
1779                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1780                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1781                 .op_name = "OP_RECLAIM_COMPLETE",
1782                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1783         },
1784         [OP_SECINFO_NO_NAME] = {
1785                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1786                 .op_flags = OP_HANDLES_WRONGSEC,
1787                 .op_name = "OP_SECINFO_NO_NAME",
1788         },
1789         [OP_TEST_STATEID] = {
1790                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1791                 .op_flags = ALLOWED_WITHOUT_FH,
1792                 .op_name = "OP_TEST_STATEID",
1793         },
1794         [OP_FREE_STATEID] = {
1795                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1796                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1797                 .op_name = "OP_FREE_STATEID",
1798                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1799                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1800         },
1801 };
1802
1803 #ifdef NFSD_DEBUG
1804 static const char *nfsd4_op_name(unsigned opnum)
1805 {
1806         if (opnum < ARRAY_SIZE(nfsd4_ops))
1807                 return nfsd4_ops[opnum].op_name;
1808         return "unknown_operation";
1809 }
1810 #endif
1811
1812 #define nfsd4_voidres                   nfsd4_voidargs
1813 struct nfsd4_voidargs { int dummy; };
1814
1815 static struct svc_procedure             nfsd_procedures4[2] = {
1816         [NFSPROC4_NULL] = {
1817                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1818                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1819                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1820                 .pc_ressize = sizeof(struct nfsd4_voidres),
1821                 .pc_cachetype = RC_NOCACHE,
1822                 .pc_xdrressize = 1,
1823         },
1824         [NFSPROC4_COMPOUND] = {
1825                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1826                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1827                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1828                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1829                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1830                 .pc_release = nfsd4_release_compoundargs,
1831                 .pc_cachetype = RC_NOCACHE,
1832                 .pc_xdrressize = NFSD_BUFSIZE/4,
1833         },
1834 };
1835
1836 struct svc_version      nfsd_version4 = {
1837                 .vs_vers        = 4,
1838                 .vs_nproc       = 2,
1839                 .vs_proc        = nfsd_procedures4,
1840                 .vs_dispatch    = nfsd_dispatch,
1841                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1842 };
1843
1844 /*
1845  * Local variables:
1846  *  c-basic-offset: 8
1847  * End:
1848  */