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 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  46 #include <linux/security.h>
  47
  48 static inline void
  49 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  50 {
  51         struct inode *inode = resfh->fh_dentry->d_inode;
  52         int status;
  53
  54         mutex_lock(&inode->i_mutex);
  55         status = security_inode_setsecctx(resfh->fh_dentry,
  56                 label->data, label->len);
  57         mutex_unlock(&inode->i_mutex);
  58
  59         if (status)
  60                 /*
  61                  * XXX: We should really fail the whole open, but we may
  62                  * already have created a new file, so it may be too
  63                  * late.  For now this seems the least of evils:
  64                  */
  65                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  66
  67         return;
  68 }
  69 #else
  70 static inline void
  71 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  72 { }
  73 #endif
  74
  75 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  76
  77 static u32 nfsd_attrmask[] = {
  78         NFSD_WRITEABLE_ATTRS_WORD0,
  79         NFSD_WRITEABLE_ATTRS_WORD1,
  80         NFSD_WRITEABLE_ATTRS_WORD2
  81 };
  82
  83 static u32 nfsd41_ex_attrmask[] = {
  84         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  85         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  86         NFSD_SUPPATTR_EXCLCREAT_WORD2
  87 };
  88
  89 static __be32
  90 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  91                    u32 *bmval, u32 *writable)
  92 {
  93         struct dentry *dentry = cstate->current_fh.fh_dentry;
  94
  95         /*
  96          * Check about attributes are supported by the NFSv4 server or not.
  97          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  98          */
  99         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 100             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 101             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 102                 return nfserr_attrnotsupp;
 103
 104         /*
 105          * Check FATTR4_WORD0_ACL can be supported
 106          * in current environment or not.
 107          */
 108         if (bmval[0] & FATTR4_WORD0_ACL) {
 109                 if (!IS_POSIXACL(dentry->d_inode))
 110                         return nfserr_attrnotsupp;
 111         }
 112
 113         /*
 114          * According to spec, read-only attributes return ERR_INVAL.
 115          */
 116         if (writable) {
 117                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 118                     (bmval[2] & ~writable[2]))
 119                         return nfserr_inval;
 120         }
 121
 122         return nfs_ok;
 123 }
 124
 125 static __be32
 126 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 127         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 128 {
 129         __be32 status = nfs_ok;
 130
 131         if (open->op_create == NFS4_OPEN_CREATE) {
 132                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 133                     || open->op_createmode == NFS4_CREATE_GUARDED)
 134                         status = check_attr_support(rqstp, cstate,
 135                                         open->op_bmval, nfsd_attrmask);
 136                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 137                         status = check_attr_support(rqstp, cstate,
 138                                         open->op_bmval, nfsd41_ex_attrmask);
 139         }
 140
 141         return status;
 142 }
 143
 144 static int
 145 is_create_with_attrs(struct nfsd4_open *open)
 146 {
 147         return open->op_create == NFS4_OPEN_CREATE
 148                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 149                     || open->op_createmode == NFS4_CREATE_GUARDED
 150                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 151 }
 152
 153 /*
 154  * if error occurs when setting the acl, just clear the acl bit
 155  * in the returned attr bitmap.
 156  */
 157 static void
 158 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 159                 struct nfs4_acl *acl, u32 *bmval)
 160 {
 161         __be32 status;
 162
 163         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 164         if (status)
 165                 /*
 166                  * We should probably fail the whole open at this point,
 167                  * but we've already created the file, so it's too late;
 168                  * So this seems the least of evils:
 169                  */
 170                 bmval[0] &= ~FATTR4_WORD0_ACL;
 171 }
 172
 173 static inline void
 174 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 175 {
 176         fh_put(dst);
 177         dget(src->fh_dentry);
 178         if (src->fh_export)
 179                 cache_get(&src->fh_export->h);
 180         *dst = *src;
 181 }
 182
 183 static __be32
 184 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 185 {
 186         __be32 status;
 187
 188         if (open->op_truncate &&
 189                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 190                 return nfserr_inval;
 191
 192         accmode |= NFSD_MAY_READ_IF_EXEC;
 193
 194         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 195                 accmode |= NFSD_MAY_READ;
 196         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 197                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 198         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 199                 accmode |= NFSD_MAY_WRITE;
 200
 201         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 202
 203         return status;
 204 }
 205
 206 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 207 {
 208         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 209
 210         if (S_ISREG(mode))
 211                 return nfs_ok;
 212         if (S_ISDIR(mode))
 213                 return nfserr_isdir;
 214         /*
 215          * Using err_symlink as our catch-all case may look odd; but
 216          * there's no other obvious error for this case in 4.0, and we
 217          * happen to know that it will cause the linux v4 client to do
 218          * the right thing on attempts to open something other than a
 219          * regular file.
 220          */
 221         return nfserr_symlink;
 222 }
 223
 224 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 225 {
 226         if (nfsd4_has_session(cstate))
 227                 return;
 228         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 229                         &resfh->fh_handle);
 230 }
 231
 232 static __be32
 233 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 234 {
 235         struct svc_fh *current_fh = &cstate->current_fh;
 236         struct svc_fh *resfh;
 237         int accmode;
 238         __be32 status;
 239
 240         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 241         if (!resfh)
 242                 return nfserr_jukebox;
 243         fh_init(resfh, NFS4_FHSIZE);
 244         open->op_truncate = 0;
 245
 246         if (open->op_create) {
 247                 /* FIXME: check session persistence and pnfs flags.
 248                  * The nfsv4.1 spec requires the following semantics:
 249                  *
 250                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 251                  * Reply Cache  | server |                 |
 252                  * -------------+--------+-----------------+--------------------
 253                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 254                  *              |        |                 | (SHOULD)
 255                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 256                  *              |        |                 | (SHOULD NOT)
 257                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 258                  * yes          | no     | GUARDED4        | GUARDED4
 259                  * yes          | yes    | GUARDED4        | GUARDED4
 260                  */
 261
 262                 /*
 263                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 264                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 265                  */
 266                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 267                                         open->op_fname.len, &open->op_iattr,
 268                                         resfh, open->op_createmode,
 269                                         (u32 *)open->op_verf.data,
 270                                         &open->op_truncate, &open->op_created);
 271
 272                 if (!status && open->op_label.len)
 273                         nfsd4_security_inode_setsecctx(resfh, &open->op_label, open->op_bmval);
 274
 275                 /*
 276                  * Following rfc 3530 14.2.16, use the returned bitmask
 277                  * to indicate which attributes we used to store the
 278                  * verifier:
 279                  */
 280                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 281                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 282                                                         FATTR4_WORD1_TIME_MODIFY);
 283         } else {
 284                 status = nfsd_lookup(rqstp, current_fh,
 285                                      open->op_fname.data, open->op_fname.len, resfh);
 286                 fh_unlock(current_fh);
 287         }
 288         if (status)
 289                 goto out;
 290         status = nfsd_check_obj_isreg(resfh);
 291         if (status)
 292                 goto out;
 293
 294         if (is_create_with_attrs(open) && open->op_acl != NULL)
 295                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 296
 297         nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
 298         accmode = NFSD_MAY_NOP;
 299         if (open->op_created ||
 300                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 301                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 302         status = do_open_permission(rqstp, resfh, open, accmode);
 303         set_change_info(&open->op_cinfo, current_fh);
 304         fh_dup2(current_fh, resfh);
 305 out:
 306         fh_put(resfh);
 307         kfree(resfh);
 308         return status;
 309 }
 310
 311 static __be32
 312 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 313 {
 314         struct svc_fh *current_fh = &cstate->current_fh;
 315         __be32 status;
 316         int accmode = 0;
 317
 318         /* We don't know the target directory, and therefore can not
 319         * set the change info
 320         */
 321
 322         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 323
 324         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 325
 326         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 327                 (open->op_iattr.ia_size == 0);
 328         /*
 329          * In the delegation case, the client is telling us about an
 330          * open that it *already* performed locally, some time ago.  We
 331          * should let it succeed now if possible.
 332          *
 333          * In the case of a CLAIM_FH open, on the other hand, the client
 334          * may be counting on us to enforce permissions (the Linux 4.1
 335          * client uses this for normal opens, for example).
 336          */
 337         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 338                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 339
 340         status = do_open_permission(rqstp, current_fh, open, accmode);
 341
 342         return status;
 343 }
 344
 345 static void
 346 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 347 {
 348         struct nfsd4_sessionid *sid =
 349                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 350
 351         clid->cl_boot = sid->clientid.cl_boot;
 352         clid->cl_id = sid->clientid.cl_id;
 353 }
 354
 355 static __be32
 356 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 357            struct nfsd4_open *open)
 358 {
 359         __be32 status;
 360         struct nfsd4_compoundres *resp;
 361         struct net *net = SVC_NET(rqstp);
 362         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 363
 364         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 365                 (int)open->op_fname.len, open->op_fname.data,
 366                 open->op_openowner);
 367
 368         /* This check required by spec. */
 369         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 370                 return nfserr_inval;
 371
 372         open->op_created = 0;
 373         /*
 374          * RFC5661 18.51.3
 375          * Before RECLAIM_COMPLETE done, server should deny new lock
 376          */
 377         if (nfsd4_has_session(cstate) &&
 378             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 379                       &cstate->session->se_client->cl_flags) &&
 380             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 381                 return nfserr_grace;
 382
 383         if (nfsd4_has_session(cstate))
 384                 copy_clientid(&open->op_clientid, cstate->session);
 385
 386         nfs4_lock_state();
 387
 388         /* check seqid for replay. set nfs4_owner */
 389         resp = rqstp->rq_resp;
 390         status = nfsd4_process_open1(&resp->cstate, open, nn);
 391         if (status == nfserr_replay_me) {
 392                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 393                 fh_put(&cstate->current_fh);
 394                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 395                                 &rp->rp_openfh);
 396                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 397                 if (status)
 398                         dprintk("nfsd4_open: replay failed"
 399                                 " restoring previous filehandle\n");
 400                 else
 401                         status = nfserr_replay_me;
 402         }
 403         if (status)
 404                 goto out;
 405         if (open->op_xdr_error) {
 406                 status = open->op_xdr_error;
 407                 goto out;
 408         }
 409
 410         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 411         if (status)
 412                 goto out;
 413
 414         /* Openowner is now set, so sequence id will get bumped.  Now we need
 415          * these checks before we do any creates: */
 416         status = nfserr_grace;
 417         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 418                 goto out;
 419         status = nfserr_no_grace;
 420         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 421                 goto out;
 422
 423         switch (open->op_claim_type) {
 424                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 425                 case NFS4_OPEN_CLAIM_NULL:
 426                         status = do_open_lookup(rqstp, cstate, open);
 427                         if (status)
 428                                 goto out;
 429                         break;
 430                 case NFS4_OPEN_CLAIM_PREVIOUS:
 431                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 432                         status = nfs4_check_open_reclaim(&open->op_clientid,
 433                                                          cstate->minorversion,
 434                                                          nn);
 435                         if (status)
 436                                 goto out;
 437                 case NFS4_OPEN_CLAIM_FH:
 438                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 439                         status = do_open_fhandle(rqstp, cstate, open);
 440                         if (status)
 441                                 goto out;
 442                         break;
 443                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 444                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 445                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 446                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 447                                 open->op_claim_type);
 448                         status = nfserr_notsupp;
 449                         goto out;
 450                 default:
 451                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 452                                 open->op_claim_type);
 453                         status = nfserr_inval;
 454                         goto out;
 455         }
 456         /*
 457          * nfsd4_process_open2() does the actual opening of the file.  If
 458          * successful, it (1) truncates the file if open->op_truncate was
 459          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 460          */
 461         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 462         WARN_ON(status && open->op_created);
 463 out:
 464         nfsd4_cleanup_open_state(open, status);
 465         if (open->op_openowner && !nfsd4_has_session(cstate))
 466                 cstate->replay_owner = &open->op_openowner->oo_owner;
 467         nfsd4_bump_seqid(cstate, status);
 468         if (!cstate->replay_owner)
 469                 nfs4_unlock_state();
 470         return status;
 471 }
 472
 473 /*
 474  * OPEN is the only seqid-mutating operation whose decoding can fail
 475  * with a seqid-mutating error (specifically, decoding of user names in
 476  * the attributes).  Therefore we have to do some processing to look up
 477  * the stateowner so that we can bump the seqid.
 478  */
 479 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 480 {
 481         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 482
 483         if (!seqid_mutating_err(ntohl(op->status)))
 484                 return op->status;
 485         if (nfsd4_has_session(cstate))
 486                 return op->status;
 487         open->op_xdr_error = op->status;
 488         return nfsd4_open(rqstp, cstate, open);
 489 }
 490
 491 /*
 492  * filehandle-manipulating ops.
 493  */
 494 static __be32
 495 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 496             struct svc_fh **getfh)
 497 {
 498         if (!cstate->current_fh.fh_dentry)
 499                 return nfserr_nofilehandle;
 500
 501         *getfh = &cstate->current_fh;
 502         return nfs_ok;
 503 }
 504
 505 static __be32
 506 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 507             struct nfsd4_putfh *putfh)
 508 {
 509         fh_put(&cstate->current_fh);
 510         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 511         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 512                putfh->pf_fhlen);
 513         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 514 }
 515
 516 static __be32
 517 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 518                 void *arg)
 519 {
 520         __be32 status;
 521
 522         fh_put(&cstate->current_fh);
 523         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 524         return status;
 525 }
 526
 527 static __be32
 528 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 529                 void *arg)
 530 {
 531         if (!cstate->save_fh.fh_dentry)
 532                 return nfserr_restorefh;
 533
 534         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 535         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 536                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 537                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 538         }
 539         return nfs_ok;
 540 }
 541
 542 static __be32
 543 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 544              void *arg)
 545 {
 546         if (!cstate->current_fh.fh_dentry)
 547                 return nfserr_nofilehandle;
 548
 549         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 550         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 551                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 552                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 553         }
 554         return nfs_ok;
 555 }
 556
 557 /*
 558  * misc nfsv4 ops
 559  */
 560 static __be32
 561 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 562              struct nfsd4_access *access)
 563 {
 564         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 565                 return nfserr_inval;
 566
 567         access->ac_resp_access = access->ac_req_access;
 568         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 569                            &access->ac_supported);
 570 }
 571
 572 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 573 {
 574         __be32 verf[2];
 575         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 576
 577         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 578         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 579         memcpy(verifier->data, verf, sizeof(verifier->data));
 580 }
 581
 582 static __be32
 583 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 584              struct nfsd4_commit *commit)
 585 {
 586         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 587         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 588                              commit->co_count);
 589 }
 590
 591 static __be32
 592 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593              struct nfsd4_create *create)
 594 {
 595         struct svc_fh resfh;
 596         __be32 status;
 597         dev_t rdev;
 598
 599         fh_init(&resfh, NFS4_FHSIZE);
 600
 601         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 602                            NFSD_MAY_CREATE);
 603         if (status)
 604                 return status;
 605
 606         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 607                                     nfsd_attrmask);
 608         if (status)
 609                 return status;
 610
 611         switch (create->cr_type) {
 612         case NF4LNK:
 613                 /* ugh! we have to null-terminate the linktext, or
 614                  * vfs_symlink() will choke.  it is always safe to
 615                  * null-terminate by brute force, since at worst we
 616                  * will overwrite the first byte of the create namelen
 617                  * in the XDR buffer, which has already been extracted
 618                  * during XDR decode.
 619                  */
 620                 create->cr_linkname[create->cr_linklen] = 0;
 621
 622                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 623                                       create->cr_name, create->cr_namelen,
 624                                       create->cr_linkname, create->cr_linklen,
 625                                       &resfh, &create->cr_iattr);
 626                 break;
 627
 628         case NF4BLK:
 629                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 630                 if (MAJOR(rdev) != create->cr_specdata1 ||
 631                     MINOR(rdev) != create->cr_specdata2)
 632                         return nfserr_inval;
 633                 status = nfsd_create(rqstp, &cstate->current_fh,
 634                                      create->cr_name, create->cr_namelen,
 635                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 636                 break;
 637
 638         case NF4CHR:
 639                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 640                 if (MAJOR(rdev) != create->cr_specdata1 ||
 641                     MINOR(rdev) != create->cr_specdata2)
 642                         return nfserr_inval;
 643                 status = nfsd_create(rqstp, &cstate->current_fh,
 644                                      create->cr_name, create->cr_namelen,
 645                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 646                 break;
 647
 648         case NF4SOCK:
 649                 status = nfsd_create(rqstp, &cstate->current_fh,
 650                                      create->cr_name, create->cr_namelen,
 651                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 652                 break;
 653
 654         case NF4FIFO:
 655                 status = nfsd_create(rqstp, &cstate->current_fh,
 656                                      create->cr_name, create->cr_namelen,
 657                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 658                 break;
 659
 660         case NF4DIR:
 661                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 662                 status = nfsd_create(rqstp, &cstate->current_fh,
 663                                      create->cr_name, create->cr_namelen,
 664                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 665                 break;
 666
 667         default:
 668                 status = nfserr_badtype;
 669         }
 670
 671         if (status)
 672                 goto out;
 673
 674         if (create->cr_label.len)
 675                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 676
 677         if (create->cr_acl != NULL)
 678                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 679                                 create->cr_bmval);
 680
 681         fh_unlock(&cstate->current_fh);
 682         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 683         fh_dup2(&cstate->current_fh, &resfh);
 684 out:
 685         fh_put(&resfh);
 686         return status;
 687 }
 688
 689 static __be32
 690 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 691               struct nfsd4_getattr *getattr)
 692 {
 693         __be32 status;
 694
 695         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 696         if (status)
 697                 return status;
 698
 699         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 700                 return nfserr_inval;
 701
 702         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 703         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 704         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 705
 706         getattr->ga_fhp = &cstate->current_fh;
 707         return nfs_ok;
 708 }
 709
 710 static __be32
 711 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 712            struct nfsd4_link *link)
 713 {
 714         __be32 status = nfserr_nofilehandle;
 715
 716         if (!cstate->save_fh.fh_dentry)
 717                 return status;
 718         status = nfsd_link(rqstp, &cstate->current_fh,
 719                            link->li_name, link->li_namelen, &cstate->save_fh);
 720         if (!status)
 721                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 722         return status;
 723 }
 724
 725 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 726 {
 727         struct svc_fh tmp_fh;
 728         __be32 ret;
 729
 730         fh_init(&tmp_fh, NFS4_FHSIZE);
 731         ret = exp_pseudoroot(rqstp, &tmp_fh);
 732         if (ret)
 733                 return ret;
 734         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 735                 fh_put(&tmp_fh);
 736                 return nfserr_noent;
 737         }
 738         fh_put(&tmp_fh);
 739         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 740 }
 741
 742 static __be32
 743 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 744               void *arg)
 745 {
 746         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 747 }
 748
 749 static __be32
 750 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 751              struct nfsd4_lookup *lookup)
 752 {
 753         return nfsd_lookup(rqstp, &cstate->current_fh,
 754                            lookup->lo_name, lookup->lo_len,
 755                            &cstate->current_fh);
 756 }
 757
 758 static __be32
 759 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 760            struct nfsd4_read *read)
 761 {
 762         __be32 status;
 763
 764         /* no need to check permission - this will be done in nfsd_read() */
 765
 766         read->rd_filp = NULL;
 767         if (read->rd_offset >= OFFSET_MAX)
 768                 return nfserr_inval;
 769
 770         /*
 771          * If we do a zero copy read, then a client will see read data
 772          * that reflects the state of the file *after* performing the
 773          * following compound.
 774          *
 775          * To ensure proper ordering, we therefore turn off zero copy if
 776          * the client wants us to do more in this compound:
 777          */
 778         if (!nfsd4_last_compound_op(rqstp))
 779                 rqstp->rq_splice_ok = false;
 780
 781         nfs4_lock_state();
 782         /* check stateid */
 783         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 784                                                  cstate, &read->rd_stateid,
 785                                                  RD_STATE, &read->rd_filp))) {
 786                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 787                 goto out;
 788         }
 789         if (read->rd_filp)
 790                 get_file(read->rd_filp);
 791         status = nfs_ok;
 792 out:
 793         nfs4_unlock_state();
 794         read->rd_rqstp = rqstp;
 795         read->rd_fhp = &cstate->current_fh;
 796         return status;
 797 }
 798
 799 static __be32
 800 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 801               struct nfsd4_readdir *readdir)
 802 {
 803         u64 cookie = readdir->rd_cookie;
 804         static const nfs4_verifier zeroverf;
 805
 806         /* no need to check permission - this will be done in nfsd_readdir() */
 807
 808         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 809                 return nfserr_inval;
 810
 811         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 812         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 813         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 814
 815         if ((cookie == 1) || (cookie == 2) ||
 816             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 817                 return nfserr_bad_cookie;
 818
 819         readdir->rd_rqstp = rqstp;
 820         readdir->rd_fhp = &cstate->current_fh;
 821         return nfs_ok;
 822 }
 823
 824 static __be32
 825 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 826                struct nfsd4_readlink *readlink)
 827 {
 828         readlink->rl_rqstp = rqstp;
 829         readlink->rl_fhp = &cstate->current_fh;
 830         return nfs_ok;
 831 }
 832
 833 static __be32
 834 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 835              struct nfsd4_remove *remove)
 836 {
 837         __be32 status;
 838
 839         if (locks_in_grace(SVC_NET(rqstp)))
 840                 return nfserr_grace;
 841         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 842                              remove->rm_name, remove->rm_namelen);
 843         if (!status) {
 844                 fh_unlock(&cstate->current_fh);
 845                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 846         }
 847         return status;
 848 }
 849
 850 static __be32
 851 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 852              struct nfsd4_rename *rename)
 853 {
 854         __be32 status = nfserr_nofilehandle;
 855
 856         if (!cstate->save_fh.fh_dentry)
 857                 return status;
 858         if (locks_in_grace(SVC_NET(rqstp)) &&
 859                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 860                 return nfserr_grace;
 861         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 862                              rename->rn_snamelen, &cstate->current_fh,
 863                              rename->rn_tname, rename->rn_tnamelen);
 864         if (status)
 865                 return status;
 866         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 867         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 868         return nfs_ok;
 869 }
 870
 871 static __be32
 872 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 873               struct nfsd4_secinfo *secinfo)
 874 {
 875         struct svc_fh resfh;
 876         struct svc_export *exp;
 877         struct dentry *dentry;
 878         __be32 err;
 879
 880         fh_init(&resfh, NFS4_FHSIZE);
 881         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 882         if (err)
 883                 return err;
 884         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 885                                     secinfo->si_name, secinfo->si_namelen,
 886                                     &exp, &dentry);
 887         if (err)
 888                 return err;
 889         if (dentry->d_inode == NULL) {
 890                 exp_put(exp);
 891                 err = nfserr_noent;
 892         } else
 893                 secinfo->si_exp = exp;
 894         dput(dentry);
 895         if (cstate->minorversion)
 896                 /* See rfc 5661 section 2.6.3.1.1.8 */
 897                 fh_put(&cstate->current_fh);
 898         return err;
 899 }
 900
 901 static __be32
 902 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 903               struct nfsd4_secinfo_no_name *sin)
 904 {
 905         __be32 err;
 906
 907         switch (sin->sin_style) {
 908         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 909                 break;
 910         case NFS4_SECINFO_STYLE4_PARENT:
 911                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 912                 if (err)
 913                         return err;
 914                 break;
 915         default:
 916                 return nfserr_inval;
 917         }
 918         exp_get(cstate->current_fh.fh_export);
 919         sin->sin_exp = cstate->current_fh.fh_export;
 920         fh_put(&cstate->current_fh);
 921         return nfs_ok;
 922 }
 923
 924 static __be32
 925 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 926               struct nfsd4_setattr *setattr)
 927 {
 928         __be32 status = nfs_ok;
 929         int err;
 930
 931         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 932                 nfs4_lock_state();
 933                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 934                         &setattr->sa_stateid, WR_STATE, NULL);
 935                 nfs4_unlock_state();
 936                 if (status) {
 937                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 938                         return status;
 939                 }
 940         }
 941         err = fh_want_write(&cstate->current_fh);
 942         if (err)
 943                 return nfserrno(err);
 944         status = nfs_ok;
 945
 946         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 947                                     nfsd_attrmask);
 948         if (status)
 949                 goto out;
 950
 951         if (setattr->sa_acl != NULL)
 952                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 953                                             setattr->sa_acl);
 954         if (status)
 955                 goto out;
 956         if (setattr->sa_label.len)
 957                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 958                                 &setattr->sa_label);
 959         if (status)
 960                 goto out;
 961         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 962                                 0, (time_t)0);
 963 out:
 964         fh_drop_write(&cstate->current_fh);
 965         return status;
 966 }
 967
 968 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 969 {
 970         int i = 1;
 971         int buflen = write->wr_buflen;
 972
 973         vec[0].iov_base = write->wr_head.iov_base;
 974         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 975         buflen -= vec[0].iov_len;
 976
 977         while (buflen) {
 978                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 979                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 980                 buflen -= vec[i].iov_len;
 981                 i++;
 982         }
 983         return i;
 984 }
 985
 986 static __be32
 987 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 988             struct nfsd4_write *write)
 989 {
 990         stateid_t *stateid = &write->wr_stateid;
 991         struct file *filp = NULL;
 992         __be32 status = nfs_ok;
 993         unsigned long cnt;
 994         int nvecs;
 995
 996         /* no need to check permission - this will be done in nfsd_write() */
 997
 998         if (write->wr_offset >= OFFSET_MAX)
 999                 return nfserr_inval;
1000
1001         nfs4_lock_state();
1002         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
1003                                         cstate, stateid, WR_STATE, &filp);
1004         if (status) {
1005                 nfs4_unlock_state();
1006                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1007                 return status;
1008         }
1009         if (filp)
1010                 get_file(filp);
1011         nfs4_unlock_state();
1012
1013         cnt = write->wr_buflen;
1014         write->wr_how_written = write->wr_stable_how;
1015         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1016
1017         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1018         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1019
1020         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1021                              write->wr_offset, rqstp->rq_vec, nvecs,
1022                              &cnt, &write->wr_how_written);
1023         if (filp)
1024                 fput(filp);
1025
1026         write->wr_bytes_written = cnt;
1027
1028         return status;
1029 }
1030
1031 /* This routine never returns NFS_OK!  If there are no other errors, it
1032  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1033  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1034  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1035  */
1036 static __be32
1037 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1038              struct nfsd4_verify *verify)
1039 {
1040         __be32 *buf, *p;
1041         int count;
1042         __be32 status;
1043
1044         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1045         if (status)
1046                 return status;
1047
1048         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1049         if (status)
1050                 return status;
1051
1052         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1053             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1054                 return nfserr_inval;
1055         if (verify->ve_attrlen & 3)
1056                 return nfserr_inval;
1057
1058         /* count in words:
1059          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1060          */
1061         count = 4 + (verify->ve_attrlen >> 2);
1062         buf = kmalloc(count << 2, GFP_KERNEL);
1063         if (!buf)
1064                 return nfserr_jukebox;
1065
1066         p = buf;
1067         status = nfsd4_encode_fattr(&cstate->current_fh,
1068                                     cstate->current_fh.fh_export,
1069                                     cstate->current_fh.fh_dentry, &p,
1070                                     count, verify->ve_bmval,
1071                                     rqstp, 0);
1072
1073         /* this means that nfsd4_encode_fattr() ran out of space */
1074         if (status == nfserr_resource)
1075                 status = nfserr_not_same;
1076         if (status)
1077                 goto out_kfree;
1078
1079         /* skip bitmap */
1080         p = buf + 1 + ntohl(buf[0]);
1081         status = nfserr_not_same;
1082         if (ntohl(*p++) != verify->ve_attrlen)
1083                 goto out_kfree;
1084         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1085                 status = nfserr_same;
1086
1087 out_kfree:
1088         kfree(buf);
1089         return status;
1090 }
1091
1092 static __be32
1093 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1094               struct nfsd4_verify *verify)
1095 {
1096         __be32 status;
1097
1098         status = _nfsd4_verify(rqstp, cstate, verify);
1099         return status == nfserr_not_same ? nfs_ok : status;
1100 }
1101
1102 static __be32
1103 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1104              struct nfsd4_verify *verify)
1105 {
1106         __be32 status;
1107
1108         status = _nfsd4_verify(rqstp, cstate, verify);
1109         return status == nfserr_same ? nfs_ok : status;
1110 }
1111
1112 /*
1113  * NULL call.
1114  */
1115 static __be32
1116 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1117 {
1118         return nfs_ok;
1119 }
1120
1121 static inline void nfsd4_increment_op_stats(u32 opnum)
1122 {
1123         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1124                 nfsdstats.nfs4_opcount[opnum]++;
1125 }
1126
1127 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1128                               void *);
1129 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1130 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1131 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1132
1133 enum nfsd4_op_flags {
1134         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1135         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1136         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1137         /* For rfc 5661 section 2.6.3.1.1: */
1138         OP_HANDLES_WRONGSEC = 1 << 3,
1139         OP_IS_PUTFH_LIKE = 1 << 4,
1140         /*
1141          * These are the ops whose result size we estimate before
1142          * encoding, to avoid performing an op then not being able to
1143          * respond or cache a response.  This includes writes and setattrs
1144          * as well as the operations usually called "nonidempotent":
1145          */
1146         OP_MODIFIES_SOMETHING = 1 << 5,
1147         /*
1148          * Cache compounds containing these ops in the xid-based drc:
1149          * We use the DRC for compounds containing non-idempotent
1150          * operations, *except* those that are 4.1-specific (since
1151          * sessions provide their own EOS), and except for stateful
1152          * operations other than setclientid and setclientid_confirm
1153          * (since sequence numbers provide EOS for open, lock, etc in
1154          * the v4.0 case).
1155          */
1156         OP_CACHEME = 1 << 6,
1157         /*
1158          * These are ops which clear current state id.
1159          */
1160         OP_CLEAR_STATEID = 1 << 7,
1161 };
1162
1163 struct nfsd4_operation {
1164         nfsd4op_func op_func;
1165         u32 op_flags;
1166         char *op_name;
1167         /* Try to get response size before operation */
1168         nfsd4op_rsize op_rsize_bop;
1169         stateid_getter op_get_currentstateid;
1170         stateid_setter op_set_currentstateid;
1171 };
1172
1173 static struct nfsd4_operation nfsd4_ops[];
1174
1175 #ifdef NFSD_DEBUG
1176 static const char *nfsd4_op_name(unsigned opnum);
1177 #endif
1178
1179 /*
1180  * Enforce NFSv4.1 COMPOUND ordering rules:
1181  *
1182  * Also note, enforced elsewhere:
1183  *      - SEQUENCE other than as first op results in
1184  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1185  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1186  *        (Enforced in nfsd4_bind_conn_to_session().)
1187  *      - DESTROY_SESSION must be the final operation in a compound, if
1188  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1189  *        (Enforced in nfsd4_destroy_session().)
1190  */
1191 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1192 {
1193         struct nfsd4_op *op = &args->ops[0];
1194
1195         /* These ordering requirements don't apply to NFSv4.0: */
1196         if (args->minorversion == 0)
1197                 return nfs_ok;
1198         /* This is weird, but OK, not our problem: */
1199         if (args->opcnt == 0)
1200                 return nfs_ok;
1201         if (op->status == nfserr_op_illegal)
1202                 return nfs_ok;
1203         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1204                 return nfserr_op_not_in_session;
1205         if (op->opnum == OP_SEQUENCE)
1206                 return nfs_ok;
1207         if (args->opcnt != 1)
1208                 return nfserr_not_only_op;
1209         return nfs_ok;
1210 }
1211
1212 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1213 {
1214         return &nfsd4_ops[op->opnum];
1215 }
1216
1217 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1218 {
1219         return OPDESC(op)->op_flags & OP_CACHEME;
1220 }
1221
1222 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1223 {
1224         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1225         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1226         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1227         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1228         struct nfsd4_operation *thisd;
1229         struct nfsd4_operation *nextd;
1230
1231         thisd = OPDESC(this);
1232         /*
1233          * Most ops check wronsec on our own; only the putfh-like ops
1234          * have special rules.
1235          */
1236         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1237                 return false;
1238         /*
1239          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1240          * put-filehandle operation if we're not going to use the
1241          * result:
1242          */
1243         if (argp->opcnt == resp->opcnt)
1244                 return false;
1245
1246         nextd = OPDESC(next);
1247         /*
1248          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1249          * errors themselves as necessary; others should check for them
1250          * now:
1251          */
1252         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1253 }
1254
1255 /*
1256  * COMPOUND call.
1257  */
1258 static __be32
1259 nfsd4_proc_compound(struct svc_rqst *rqstp,
1260                     struct nfsd4_compoundargs *args,
1261                     struct nfsd4_compoundres *resp)
1262 {
1263         struct nfsd4_op *op;
1264         struct nfsd4_operation *opdesc;
1265         struct nfsd4_compound_state *cstate = &resp->cstate;
1266         int             slack_bytes;
1267         u32             plen = 0;
1268         __be32          status;
1269
1270         resp->xbuf = &rqstp->rq_res;
1271         resp->p = rqstp->rq_res.head[0].iov_base +
1272                                                 rqstp->rq_res.head[0].iov_len;
1273         resp->tagp = resp->p;
1274         /* reserve space for: taglen, tag, and opcnt */
1275         resp->p += 2 + XDR_QUADLEN(args->taglen);
1276         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1277         resp->taglen = args->taglen;
1278         resp->tag = args->tag;
1279         resp->opcnt = 0;
1280         resp->rqstp = rqstp;
1281         resp->cstate.minorversion = args->minorversion;
1282         resp->cstate.replay_owner = NULL;
1283         resp->cstate.session = NULL;
1284         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1285         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1286         /*
1287          * Don't use the deferral mechanism for NFSv4; compounds make it
1288          * too hard to avoid non-idempotency problems.
1289          */
1290         rqstp->rq_usedeferral = 0;
1291
1292         /*
1293          * According to RFC3010, this takes precedence over all other errors.
1294          */
1295         status = nfserr_minor_vers_mismatch;
1296         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1297                 goto out;
1298
1299         status = nfs41_check_op_ordering(args);
1300         if (status) {
1301                 op = &args->ops[0];
1302                 op->status = status;
1303                 goto encode_op;
1304         }
1305
1306         while (!status && resp->opcnt < args->opcnt) {
1307                 op = &args->ops[resp->opcnt++];
1308
1309                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1310                         resp->opcnt, args->opcnt, op->opnum,
1311                         nfsd4_op_name(op->opnum));
1312                 /*
1313                  * The XDR decode routines may have pre-set op->status;
1314                  * for example, if there is a miscellaneous XDR error
1315                  * it will be set to nfserr_bad_xdr.
1316                  */
1317                 if (op->status) {
1318                         if (op->opnum == OP_OPEN)
1319                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1320                         goto encode_op;
1321                 }
1322
1323                 /* We must be able to encode a successful response to
1324                  * this operation, with enough room left over to encode a
1325                  * failed response to the next operation.  If we don't
1326                  * have enough room, fail with ERR_RESOURCE.
1327                  */
1328                 slack_bytes = (char *)resp->end - (char *)resp->p;
1329                 if (slack_bytes < COMPOUND_SLACK_SPACE
1330                                 + COMPOUND_ERR_SLACK_SPACE) {
1331                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1332                         op->status = nfserr_resource;
1333                         goto encode_op;
1334                 }
1335
1336                 opdesc = OPDESC(op);
1337
1338                 if (!cstate->current_fh.fh_dentry) {
1339                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1340                                 op->status = nfserr_nofilehandle;
1341                                 goto encode_op;
1342                         }
1343                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1344                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1345                         op->status = nfserr_moved;
1346                         goto encode_op;
1347                 }
1348
1349                 /* If op is non-idempotent */
1350                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1351                         plen = opdesc->op_rsize_bop(rqstp, op);
1352                         op->status = nfsd4_check_resp_size(resp, plen);
1353                 }
1354
1355                 if (op->status)
1356                         goto encode_op;
1357
1358                 if (opdesc->op_get_currentstateid)
1359                         opdesc->op_get_currentstateid(cstate, &op->u);
1360                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1361
1362                 if (!op->status) {
1363                         if (opdesc->op_set_currentstateid)
1364                                 opdesc->op_set_currentstateid(cstate, &op->u);
1365
1366                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1367                                 clear_current_stateid(cstate);
1368
1369                         if (need_wrongsec_check(rqstp))
1370                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1371                 }
1372
1373 encode_op:
1374                 /* Only from SEQUENCE */
1375                 if (resp->cstate.status == nfserr_replay_cache) {
1376                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1377                         status = op->status;
1378                         goto out;
1379                 }
1380                 if (op->status == nfserr_replay_me) {
1381                         op->replay = &cstate->replay_owner->so_replay;
1382                         nfsd4_encode_replay(resp, op);
1383                         status = op->status = op->replay->rp_status;
1384                 } else {
1385                         nfsd4_encode_operation(resp, op);
1386                         status = op->status;
1387                 }
1388
1389                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1390                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1391                         be32_to_cpu(status));
1392
1393                 if (cstate->replay_owner) {
1394                         nfs4_unlock_state();
1395                         cstate->replay_owner = NULL;
1396                 }
1397                 /* XXX Ugh, we need to get rid of this kind of special case: */
1398                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1399                         fput(op->u.read.rd_filp);
1400
1401                 nfsd4_increment_op_stats(op->opnum);
1402         }
1403
1404         resp->cstate.status = status;
1405         fh_put(&resp->cstate.current_fh);
1406         fh_put(&resp->cstate.save_fh);
1407         BUG_ON(resp->cstate.replay_owner);
1408 out:
1409         /* Reset deferral mechanism for RPC deferrals */
1410         rqstp->rq_usedeferral = 1;
1411         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1412         return status;
1413 }
1414
1415 #define op_encode_hdr_size              (2)
1416 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1417 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1418 #define op_encode_change_info_maxsz     (5)
1419 #define nfs4_fattr_bitmap_maxsz         (4)
1420
1421 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1422 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1423
1424 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1425
1426 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1427 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1428                                          op_encode_ace_maxsz)
1429
1430 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1431
1432 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1433 {
1434         return (op_encode_hdr_size) * sizeof(__be32);
1435 }
1436
1437 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1438 {
1439         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1440 }
1441
1442 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1443 {
1444         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1445 }
1446
1447 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1448 {
1449         return (op_encode_hdr_size + op_encode_change_info_maxsz
1450                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1451 }
1452
1453 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1454 {
1455         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1456                 * sizeof(__be32);
1457 }
1458
1459 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1460 {
1461         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1462                 * sizeof(__be32);
1463 }
1464
1465 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1466 {
1467         return (op_encode_hdr_size + op_encode_stateid_maxsz
1468                 + op_encode_change_info_maxsz + 1
1469                 + nfs4_fattr_bitmap_maxsz
1470                 + op_encode_delegation_maxsz) * sizeof(__be32);
1471 }
1472
1473 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1474 {
1475         u32 maxcount = 0, rlen = 0;
1476
1477         maxcount = svc_max_payload(rqstp);
1478         rlen = op->u.read.rd_length;
1479
1480         if (rlen > maxcount)
1481                 rlen = maxcount;
1482
1483         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1484 }
1485
1486 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1487 {
1488         u32 rlen = op->u.readdir.rd_maxcount;
1489
1490         if (rlen > PAGE_SIZE)
1491                 rlen = PAGE_SIZE;
1492
1493         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1494                  * sizeof(__be32) + rlen;
1495 }
1496
1497 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1498 {
1499         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1500                 * sizeof(__be32);
1501 }
1502
1503 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1504 {
1505         return (op_encode_hdr_size + op_encode_change_info_maxsz
1506                 + op_encode_change_info_maxsz) * sizeof(__be32);
1507 }
1508
1509 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1510 {
1511         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1512 }
1513
1514 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1515 {
1516         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1517 }
1518
1519 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1520 {
1521         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1522 }
1523
1524 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1525 {
1526         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1527                 1 + 1 + 2 + /* eir_flags, spr_how, spo_must_enforce & _allow */\
1528                 2 + /*eir_server_owner.so_minor_id */\
1529                 /* eir_server_owner.so_major_id<> */\
1530                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1531                 /* eir_server_scope<> */\
1532                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1533                 1 + /* eir_server_impl_id array length */\
1534                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1535 }
1536
1537 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1538 {
1539         return (op_encode_hdr_size + \
1540                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1541                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1542 }
1543
1544 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1545 {
1546         return (op_encode_hdr_size + \
1547                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1548                 2 + /* csr_sequence, csr_flags */\
1549                 op_encode_channel_attrs_maxsz + \
1550                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1551 }
1552
1553 static struct nfsd4_operation nfsd4_ops[] = {
1554         [OP_ACCESS] = {
1555                 .op_func = (nfsd4op_func)nfsd4_access,
1556                 .op_name = "OP_ACCESS",
1557         },
1558         [OP_CLOSE] = {
1559                 .op_func = (nfsd4op_func)nfsd4_close,
1560                 .op_flags = OP_MODIFIES_SOMETHING,
1561                 .op_name = "OP_CLOSE",
1562                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1563                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1564                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1565         },
1566         [OP_COMMIT] = {
1567                 .op_func = (nfsd4op_func)nfsd4_commit,
1568                 .op_flags = OP_MODIFIES_SOMETHING,
1569                 .op_name = "OP_COMMIT",
1570                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1571         },
1572         [OP_CREATE] = {
1573                 .op_func = (nfsd4op_func)nfsd4_create,
1574                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1575                 .op_name = "OP_CREATE",
1576                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1577         },
1578         [OP_DELEGRETURN] = {
1579                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1580                 .op_flags = OP_MODIFIES_SOMETHING,
1581                 .op_name = "OP_DELEGRETURN",
1582                 .op_rsize_bop = nfsd4_only_status_rsize,
1583                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1584         },
1585         [OP_GETATTR] = {
1586                 .op_func = (nfsd4op_func)nfsd4_getattr,
1587                 .op_flags = ALLOWED_ON_ABSENT_FS,
1588                 .op_name = "OP_GETATTR",
1589         },
1590         [OP_GETFH] = {
1591                 .op_func = (nfsd4op_func)nfsd4_getfh,
1592                 .op_name = "OP_GETFH",
1593         },
1594         [OP_LINK] = {
1595                 .op_func = (nfsd4op_func)nfsd4_link,
1596                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1597                                 | OP_CACHEME,
1598                 .op_name = "OP_LINK",
1599                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1600         },
1601         [OP_LOCK] = {
1602                 .op_func = (nfsd4op_func)nfsd4_lock,
1603                 .op_flags = OP_MODIFIES_SOMETHING,
1604                 .op_name = "OP_LOCK",
1605                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1606                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1607         },
1608         [OP_LOCKT] = {
1609                 .op_func = (nfsd4op_func)nfsd4_lockt,
1610                 .op_name = "OP_LOCKT",
1611         },
1612         [OP_LOCKU] = {
1613                 .op_func = (nfsd4op_func)nfsd4_locku,
1614                 .op_flags = OP_MODIFIES_SOMETHING,
1615                 .op_name = "OP_LOCKU",
1616                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1617                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1618         },
1619         [OP_LOOKUP] = {
1620                 .op_func = (nfsd4op_func)nfsd4_lookup,
1621                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1622                 .op_name = "OP_LOOKUP",
1623         },
1624         [OP_LOOKUPP] = {
1625                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1626                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1627                 .op_name = "OP_LOOKUPP",
1628         },
1629         [OP_NVERIFY] = {
1630                 .op_func = (nfsd4op_func)nfsd4_nverify,
1631                 .op_name = "OP_NVERIFY",
1632         },
1633         [OP_OPEN] = {
1634                 .op_func = (nfsd4op_func)nfsd4_open,
1635                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1636                 .op_name = "OP_OPEN",
1637                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1638                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1639         },
1640         [OP_OPEN_CONFIRM] = {
1641                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1642                 .op_flags = OP_MODIFIES_SOMETHING,
1643                 .op_name = "OP_OPEN_CONFIRM",
1644                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1645         },
1646         [OP_OPEN_DOWNGRADE] = {
1647                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1648                 .op_flags = OP_MODIFIES_SOMETHING,
1649                 .op_name = "OP_OPEN_DOWNGRADE",
1650                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1651                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1652                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1653         },
1654         [OP_PUTFH] = {
1655                 .op_func = (nfsd4op_func)nfsd4_putfh,
1656                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1657                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1658                                 | OP_CLEAR_STATEID,
1659                 .op_name = "OP_PUTFH",
1660                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1661         },
1662         [OP_PUTPUBFH] = {
1663                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1664                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1665                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1666                                 | OP_CLEAR_STATEID,
1667                 .op_name = "OP_PUTPUBFH",
1668                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1669         },
1670         [OP_PUTROOTFH] = {
1671                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1672                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1673                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1674                                 | OP_CLEAR_STATEID,
1675                 .op_name = "OP_PUTROOTFH",
1676                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1677         },
1678         [OP_READ] = {
1679                 .op_func = (nfsd4op_func)nfsd4_read,
1680                 .op_flags = OP_MODIFIES_SOMETHING,
1681                 .op_name = "OP_READ",
1682                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1683                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1684         },
1685         [OP_READDIR] = {
1686                 .op_func = (nfsd4op_func)nfsd4_readdir,
1687                 .op_flags = OP_MODIFIES_SOMETHING,
1688                 .op_name = "OP_READDIR",
1689                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1690         },
1691         [OP_READLINK] = {
1692                 .op_func = (nfsd4op_func)nfsd4_readlink,
1693                 .op_name = "OP_READLINK",
1694         },
1695         [OP_REMOVE] = {
1696                 .op_func = (nfsd4op_func)nfsd4_remove,
1697                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1698                 .op_name = "OP_REMOVE",
1699                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1700         },
1701         [OP_RENAME] = {
1702                 .op_func = (nfsd4op_func)nfsd4_rename,
1703                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1704                 .op_name = "OP_RENAME",
1705                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1706         },
1707         [OP_RENEW] = {
1708                 .op_func = (nfsd4op_func)nfsd4_renew,
1709                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1710                                 | OP_MODIFIES_SOMETHING,
1711                 .op_name = "OP_RENEW",
1712                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1713
1714         },
1715         [OP_RESTOREFH] = {
1716                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1717                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1718                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1719                 .op_name = "OP_RESTOREFH",
1720                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1721         },
1722         [OP_SAVEFH] = {
1723                 .op_func = (nfsd4op_func)nfsd4_savefh,
1724                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1725                 .op_name = "OP_SAVEFH",
1726                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1727         },
1728         [OP_SECINFO] = {
1729                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1730                 .op_flags = OP_HANDLES_WRONGSEC,
1731                 .op_name = "OP_SECINFO",
1732         },
1733         [OP_SETATTR] = {
1734                 .op_func = (nfsd4op_func)nfsd4_setattr,
1735                 .op_name = "OP_SETATTR",
1736                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1737                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1738                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1739         },
1740         [OP_SETCLIENTID] = {
1741                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1742                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1743                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1744                 .op_name = "OP_SETCLIENTID",
1745                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1746         },
1747         [OP_SETCLIENTID_CONFIRM] = {
1748                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1749                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1750                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1751                 .op_name = "OP_SETCLIENTID_CONFIRM",
1752                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1753         },
1754         [OP_VERIFY] = {
1755                 .op_func = (nfsd4op_func)nfsd4_verify,
1756                 .op_name = "OP_VERIFY",
1757         },
1758         [OP_WRITE] = {
1759                 .op_func = (nfsd4op_func)nfsd4_write,
1760                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1761                 .op_name = "OP_WRITE",
1762                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1763                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1764         },
1765         [OP_RELEASE_LOCKOWNER] = {
1766                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1767                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1768                                 | OP_MODIFIES_SOMETHING,
1769                 .op_name = "OP_RELEASE_LOCKOWNER",
1770                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1771         },
1772
1773         /* NFSv4.1 operations */
1774         [OP_EXCHANGE_ID] = {
1775                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1776                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1777                                 | OP_MODIFIES_SOMETHING,
1778                 .op_name = "OP_EXCHANGE_ID",
1779                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1780         },
1781         [OP_BACKCHANNEL_CTL] = {
1782                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1783                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1784                 .op_name = "OP_BACKCHANNEL_CTL",
1785                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1786         },
1787         [OP_BIND_CONN_TO_SESSION] = {
1788                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1789                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1790                                 | OP_MODIFIES_SOMETHING,
1791                 .op_name = "OP_BIND_CONN_TO_SESSION",
1792                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1793         },
1794         [OP_CREATE_SESSION] = {
1795                 .op_func = (nfsd4op_func)nfsd4_create_session,
1796                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1797                                 | OP_MODIFIES_SOMETHING,
1798                 .op_name = "OP_CREATE_SESSION",
1799                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1800         },
1801         [OP_DESTROY_SESSION] = {
1802                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1803                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1804                                 | OP_MODIFIES_SOMETHING,
1805                 .op_name = "OP_DESTROY_SESSION",
1806                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1807         },
1808         [OP_SEQUENCE] = {
1809                 .op_func = (nfsd4op_func)nfsd4_sequence,
1810                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1811                 .op_name = "OP_SEQUENCE",
1812         },
1813         [OP_DESTROY_CLIENTID] = {
1814                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1815                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1816                                 | OP_MODIFIES_SOMETHING,
1817                 .op_name = "OP_DESTROY_CLIENTID",
1818                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1819         },
1820         [OP_RECLAIM_COMPLETE] = {
1821                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1822                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1823                 .op_name = "OP_RECLAIM_COMPLETE",
1824                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1825         },
1826         [OP_SECINFO_NO_NAME] = {
1827                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1828                 .op_flags = OP_HANDLES_WRONGSEC,
1829                 .op_name = "OP_SECINFO_NO_NAME",
1830         },
1831         [OP_TEST_STATEID] = {
1832                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1833                 .op_flags = ALLOWED_WITHOUT_FH,
1834                 .op_name = "OP_TEST_STATEID",
1835         },
1836         [OP_FREE_STATEID] = {
1837                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1838                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1839                 .op_name = "OP_FREE_STATEID",
1840                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1841                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1842         },
1843 };
1844
1845 #ifdef NFSD_DEBUG
1846 static const char *nfsd4_op_name(unsigned opnum)
1847 {
1848         if (opnum < ARRAY_SIZE(nfsd4_ops))
1849                 return nfsd4_ops[opnum].op_name;
1850         return "unknown_operation";
1851 }
1852 #endif
1853
1854 #define nfsd4_voidres                   nfsd4_voidargs
1855 struct nfsd4_voidargs { int dummy; };
1856
1857 static struct svc_procedure             nfsd_procedures4[2] = {
1858         [NFSPROC4_NULL] = {
1859                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1860                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1861                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1862                 .pc_ressize = sizeof(struct nfsd4_voidres),
1863                 .pc_cachetype = RC_NOCACHE,
1864                 .pc_xdrressize = 1,
1865         },
1866         [NFSPROC4_COMPOUND] = {
1867                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1868                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1869                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1870                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1871                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1872                 .pc_release = nfsd4_release_compoundargs,
1873                 .pc_cachetype = RC_NOCACHE,
1874                 .pc_xdrressize = NFSD_BUFSIZE/4,
1875         },
1876 };
1877
1878 struct svc_version      nfsd_version4 = {
1879                 .vs_vers        = 4,
1880                 .vs_nproc       = 2,
1881                 .vs_proc        = nfsd_procedures4,
1882                 .vs_dispatch    = nfsd_dispatch,
1883                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1884 };
1885
1886 /*
1887  * Local variables:
1888  *  c-basic-offset: 8
1889  * End:
1890  */