Pileus Git - ~andy/linux/blob - 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 #include "acl.h"
  45
  46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  47 #include <linux/security.h>
  48
  49 static inline void
  50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  51 {
  52         struct inode *inode = resfh->fh_dentry->d_inode;
  53         int status;
  54
  55         mutex_lock(&inode->i_mutex);
  56         status = security_inode_setsecctx(resfh->fh_dentry,
  57                 label->data, label->len);
  58         mutex_unlock(&inode->i_mutex);
  59
  60         if (status)
  61                 /*
  62                  * XXX: We should really fail the whole open, but we may
  63                  * already have created a new file, so it may be too
  64                  * late.  For now this seems the least of evils:
  65                  */
  66                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  67
  68         return;
  69 }
  70 #else
  71 static inline void
  72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  73 { }
  74 #endif
  75
  76 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  77
  78 static u32 nfsd_attrmask[] = {
  79         NFSD_WRITEABLE_ATTRS_WORD0,
  80         NFSD_WRITEABLE_ATTRS_WORD1,
  81         NFSD_WRITEABLE_ATTRS_WORD2
  82 };
  83
  84 static u32 nfsd41_ex_attrmask[] = {
  85         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  86         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  87         NFSD_SUPPATTR_EXCLCREAT_WORD2
  88 };
  89
  90 static __be32
  91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  92                    u32 *bmval, u32 *writable)
  93 {
  94         struct dentry *dentry = cstate->current_fh.fh_dentry;
  95
  96         /*
  97          * Check about attributes are supported by the NFSv4 server or not.
  98          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
  99          */
 100         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 101             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 102             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 103                 return nfserr_attrnotsupp;
 104
 105         /*
 106          * Check FATTR4_WORD0_ACL can be supported
 107          * in current environment or not.
 108          */
 109         if (bmval[0] & FATTR4_WORD0_ACL) {
 110                 if (!IS_POSIXACL(dentry->d_inode))
 111                         return nfserr_attrnotsupp;
 112         }
 113
 114         /*
 115          * According to spec, read-only attributes return ERR_INVAL.
 116          */
 117         if (writable) {
 118                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 119                     (bmval[2] & ~writable[2]))
 120                         return nfserr_inval;
 121         }
 122
 123         return nfs_ok;
 124 }
 125
 126 static __be32
 127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 128         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 129 {
 130         __be32 status = nfs_ok;
 131
 132         if (open->op_create == NFS4_OPEN_CREATE) {
 133                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 134                     || open->op_createmode == NFS4_CREATE_GUARDED)
 135                         status = check_attr_support(rqstp, cstate,
 136                                         open->op_bmval, nfsd_attrmask);
 137                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd41_ex_attrmask);
 140         }
 141
 142         return status;
 143 }
 144
 145 static int
 146 is_create_with_attrs(struct nfsd4_open *open)
 147 {
 148         return open->op_create == NFS4_OPEN_CREATE
 149                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 150                     || open->op_createmode == NFS4_CREATE_GUARDED
 151                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 152 }
 153
 154 /*
 155  * if error occurs when setting the acl, just clear the acl bit
 156  * in the returned attr bitmap.
 157  */
 158 static void
 159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 160                 struct nfs4_acl *acl, u32 *bmval)
 161 {
 162         __be32 status;
 163
 164         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 165         if (status)
 166                 /*
 167                  * We should probably fail the whole open at this point,
 168                  * but we've already created the file, so it's too late;
 169                  * So this seems the least of evils:
 170                  */
 171                 bmval[0] &= ~FATTR4_WORD0_ACL;
 172 }
 173
 174 static inline void
 175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 176 {
 177         fh_put(dst);
 178         dget(src->fh_dentry);
 179         if (src->fh_export)
 180                 cache_get(&src->fh_export->h);
 181         *dst = *src;
 182 }
 183
 184 static __be32
 185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 186 {
 187         __be32 status;
 188
 189         if (open->op_truncate &&
 190                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 191                 return nfserr_inval;
 192
 193         accmode |= NFSD_MAY_READ_IF_EXEC;
 194
 195         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 196                 accmode |= NFSD_MAY_READ;
 197         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 198                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 199         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 200                 accmode |= NFSD_MAY_WRITE;
 201
 202         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 203
 204         return status;
 205 }
 206
 207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 208 {
 209         umode_t mode = fh->fh_dentry->d_inode->i_mode;
 210
 211         if (S_ISREG(mode))
 212                 return nfs_ok;
 213         if (S_ISDIR(mode))
 214                 return nfserr_isdir;
 215         /*
 216          * Using err_symlink as our catch-all case may look odd; but
 217          * there's no other obvious error for this case in 4.0, and we
 218          * happen to know that it will cause the linux v4 client to do
 219          * the right thing on attempts to open something other than a
 220          * regular file.
 221          */
 222         return nfserr_symlink;
 223 }
 224
 225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 226 {
 227         if (nfsd4_has_session(cstate))
 228                 return;
 229         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 230                         &resfh->fh_handle);
 231 }
 232
 233 static __be32
 234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 235 {
 236         struct svc_fh *current_fh = &cstate->current_fh;
 237         struct svc_fh *resfh;
 238         int accmode;
 239         __be32 status;
 240
 241         resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 242         if (!resfh)
 243                 return nfserr_jukebox;
 244         fh_init(resfh, NFS4_FHSIZE);
 245         open->op_truncate = 0;
 246
 247         if (open->op_create) {
 248                 /* FIXME: check session persistence and pnfs flags.
 249                  * The nfsv4.1 spec requires the following semantics:
 250                  *
 251                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 252                  * Reply Cache  | server |                 |
 253                  * -------------+--------+-----------------+--------------------
 254                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 255                  *              |        |                 | (SHOULD)
 256                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 257                  *              |        |                 | (SHOULD NOT)
 258                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 259                  * yes          | no     | GUARDED4        | GUARDED4
 260                  * yes          | yes    | GUARDED4        | GUARDED4
 261                  */
 262
 263                 /*
 264                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 265                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 266                  */
 267                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 268                                         open->op_fname.len, &open->op_iattr,
 269                                         resfh, open->op_createmode,
 270                                         (u32 *)open->op_verf.data,
 271                                         &open->op_truncate, &open->op_created);
 272
 273                 if (!status && open->op_label.len)
 274                         nfsd4_security_inode_setsecctx(resfh, &open->op_label, open->op_bmval);
 275
 276                 /*
 277                  * Following rfc 3530 14.2.16, use the returned bitmask
 278                  * to indicate which attributes we used to store the
 279                  * verifier:
 280                  */
 281                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
 282                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
 283                                                         FATTR4_WORD1_TIME_MODIFY);
 284         } else {
 285                 status = nfsd_lookup(rqstp, current_fh,
 286                                      open->op_fname.data, open->op_fname.len, resfh);
 287                 fh_unlock(current_fh);
 288         }
 289         if (status)
 290                 goto out;
 291         status = nfsd_check_obj_isreg(resfh);
 292         if (status)
 293                 goto out;
 294
 295         if (is_create_with_attrs(open) && open->op_acl != NULL)
 296                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
 297
 298         nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
 299         accmode = NFSD_MAY_NOP;
 300         if (open->op_created ||
 301                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 302                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 303         status = do_open_permission(rqstp, resfh, open, accmode);
 304         set_change_info(&open->op_cinfo, current_fh);
 305         fh_dup2(current_fh, resfh);
 306 out:
 307         fh_put(resfh);
 308         kfree(resfh);
 309         return status;
 310 }
 311
 312 static __be32
 313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 314 {
 315         struct svc_fh *current_fh = &cstate->current_fh;
 316         __be32 status;
 317         int accmode = 0;
 318
 319         /* We don't know the target directory, and therefore can not
 320         * set the change info
 321         */
 322
 323         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 324
 325         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 326
 327         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 328                 (open->op_iattr.ia_size == 0);
 329         /*
 330          * In the delegation case, the client is telling us about an
 331          * open that it *already* performed locally, some time ago.  We
 332          * should let it succeed now if possible.
 333          *
 334          * In the case of a CLAIM_FH open, on the other hand, the client
 335          * may be counting on us to enforce permissions (the Linux 4.1
 336          * client uses this for normal opens, for example).
 337          */
 338         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 339                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 340
 341         status = do_open_permission(rqstp, current_fh, open, accmode);
 342
 343         return status;
 344 }
 345
 346 static void
 347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 348 {
 349         struct nfsd4_sessionid *sid =
 350                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 351
 352         clid->cl_boot = sid->clientid.cl_boot;
 353         clid->cl_id = sid->clientid.cl_id;
 354 }
 355
 356 static __be32
 357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 358            struct nfsd4_open *open)
 359 {
 360         __be32 status;
 361         struct nfsd4_compoundres *resp;
 362         struct net *net = SVC_NET(rqstp);
 363         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 364
 365         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 366                 (int)open->op_fname.len, open->op_fname.data,
 367                 open->op_openowner);
 368
 369         /* This check required by spec. */
 370         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 371                 return nfserr_inval;
 372
 373         open->op_created = 0;
 374         /*
 375          * RFC5661 18.51.3
 376          * Before RECLAIM_COMPLETE done, server should deny new lock
 377          */
 378         if (nfsd4_has_session(cstate) &&
 379             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 380                       &cstate->session->se_client->cl_flags) &&
 381             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 382                 return nfserr_grace;
 383
 384         if (nfsd4_has_session(cstate))
 385                 copy_clientid(&open->op_clientid, cstate->session);
 386
 387         nfs4_lock_state();
 388
 389         /* check seqid for replay. set nfs4_owner */
 390         resp = rqstp->rq_resp;
 391         status = nfsd4_process_open1(&resp->cstate, open, nn);
 392         if (status == nfserr_replay_me) {
 393                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 394                 fh_put(&cstate->current_fh);
 395                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 396                                 &rp->rp_openfh);
 397                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 398                 if (status)
 399                         dprintk("nfsd4_open: replay failed"
 400                                 " restoring previous filehandle\n");
 401                 else
 402                         status = nfserr_replay_me;
 403         }
 404         if (status)
 405                 goto out;
 406         if (open->op_xdr_error) {
 407                 status = open->op_xdr_error;
 408                 goto out;
 409         }
 410
 411         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 412         if (status)
 413                 goto out;
 414
 415         /* Openowner is now set, so sequence id will get bumped.  Now we need
 416          * these checks before we do any creates: */
 417         status = nfserr_grace;
 418         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 419                 goto out;
 420         status = nfserr_no_grace;
 421         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 422                 goto out;
 423
 424         switch (open->op_claim_type) {
 425                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 426                 case NFS4_OPEN_CLAIM_NULL:
 427                         status = do_open_lookup(rqstp, cstate, open);
 428                         if (status)
 429                                 goto out;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_PREVIOUS:
 432                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 433                         status = nfs4_check_open_reclaim(&open->op_clientid,
 434                                                          cstate->minorversion,
 435                                                          nn);
 436                         if (status)
 437                                 goto out;
 438                 case NFS4_OPEN_CLAIM_FH:
 439                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 440                         status = do_open_fhandle(rqstp, cstate, open);
 441                         if (status)
 442                                 goto out;
 443                         break;
 444                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 445                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 446                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 447                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 448                                 open->op_claim_type);
 449                         status = nfserr_notsupp;
 450                         goto out;
 451                 default:
 452                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 453                                 open->op_claim_type);
 454                         status = nfserr_inval;
 455                         goto out;
 456         }
 457         /*
 458          * nfsd4_process_open2() does the actual opening of the file.  If
 459          * successful, it (1) truncates the file if open->op_truncate was
 460          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 461          */
 462         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
 463         WARN_ON(status && open->op_created);
 464 out:
 465         nfsd4_cleanup_open_state(open, status);
 466         if (open->op_openowner && !nfsd4_has_session(cstate))
 467                 cstate->replay_owner = &open->op_openowner->oo_owner;
 468         nfsd4_bump_seqid(cstate, status);
 469         if (!cstate->replay_owner)
 470                 nfs4_unlock_state();
 471         return status;
 472 }
 473
 474 /*
 475  * OPEN is the only seqid-mutating operation whose decoding can fail
 476  * with a seqid-mutating error (specifically, decoding of user names in
 477  * the attributes).  Therefore we have to do some processing to look up
 478  * the stateowner so that we can bump the seqid.
 479  */
 480 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 481 {
 482         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 483
 484         if (!seqid_mutating_err(ntohl(op->status)))
 485                 return op->status;
 486         if (nfsd4_has_session(cstate))
 487                 return op->status;
 488         open->op_xdr_error = op->status;
 489         return nfsd4_open(rqstp, cstate, open);
 490 }
 491
 492 /*
 493  * filehandle-manipulating ops.
 494  */
 495 static __be32
 496 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 497             struct svc_fh **getfh)
 498 {
 499         if (!cstate->current_fh.fh_dentry)
 500                 return nfserr_nofilehandle;
 501
 502         *getfh = &cstate->current_fh;
 503         return nfs_ok;
 504 }
 505
 506 static __be32
 507 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 508             struct nfsd4_putfh *putfh)
 509 {
 510         fh_put(&cstate->current_fh);
 511         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 512         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 513                putfh->pf_fhlen);
 514         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 515 }
 516
 517 static __be32
 518 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 519                 void *arg)
 520 {
 521         __be32 status;
 522
 523         fh_put(&cstate->current_fh);
 524         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 525         return status;
 526 }
 527
 528 static __be32
 529 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 530                 void *arg)
 531 {
 532         if (!cstate->save_fh.fh_dentry)
 533                 return nfserr_restorefh;
 534
 535         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 536         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 537                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 538                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 539         }
 540         return nfs_ok;
 541 }
 542
 543 static __be32
 544 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 545              void *arg)
 546 {
 547         if (!cstate->current_fh.fh_dentry)
 548                 return nfserr_nofilehandle;
 549
 550         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 551         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 552                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 553                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 554         }
 555         return nfs_ok;
 556 }
 557
 558 /*
 559  * misc nfsv4 ops
 560  */
 561 static __be32
 562 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 563              struct nfsd4_access *access)
 564 {
 565         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 566                 return nfserr_inval;
 567
 568         access->ac_resp_access = access->ac_req_access;
 569         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 570                            &access->ac_supported);
 571 }
 572
 573 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 574 {
 575         __be32 verf[2];
 576         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 577
 578         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
 579         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
 580         memcpy(verifier->data, verf, sizeof(verifier->data));
 581 }
 582
 583 static __be32
 584 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 585              struct nfsd4_commit *commit)
 586 {
 587         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 588         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 589                              commit->co_count);
 590 }
 591
 592 static __be32
 593 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 594              struct nfsd4_create *create)
 595 {
 596         struct svc_fh resfh;
 597         __be32 status;
 598         dev_t rdev;
 599
 600         fh_init(&resfh, NFS4_FHSIZE);
 601
 602         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 603                            NFSD_MAY_CREATE);
 604         if (status)
 605                 return status;
 606
 607         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 608                                     nfsd_attrmask);
 609         if (status)
 610                 return status;
 611
 612         switch (create->cr_type) {
 613         case NF4LNK:
 614                 /* ugh! we have to null-terminate the linktext, or
 615                  * vfs_symlink() will choke.  it is always safe to
 616                  * null-terminate by brute force, since at worst we
 617                  * will overwrite the first byte of the create namelen
 618                  * in the XDR buffer, which has already been extracted
 619                  * during XDR decode.
 620                  */
 621                 create->cr_linkname[create->cr_linklen] = 0;
 622
 623                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 624                                       create->cr_name, create->cr_namelen,
 625                                       create->cr_linkname, create->cr_linklen,
 626                                       &resfh, &create->cr_iattr);
 627                 break;
 628
 629         case NF4BLK:
 630                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 631                 if (MAJOR(rdev) != create->cr_specdata1 ||
 632                     MINOR(rdev) != create->cr_specdata2)
 633                         return nfserr_inval;
 634                 status = nfsd_create(rqstp, &cstate->current_fh,
 635                                      create->cr_name, create->cr_namelen,
 636                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 637                 break;
 638
 639         case NF4CHR:
 640                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 641                 if (MAJOR(rdev) != create->cr_specdata1 ||
 642                     MINOR(rdev) != create->cr_specdata2)
 643                         return nfserr_inval;
 644                 status = nfsd_create(rqstp, &cstate->current_fh,
 645                                      create->cr_name, create->cr_namelen,
 646                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 647                 break;
 648
 649         case NF4SOCK:
 650                 status = nfsd_create(rqstp, &cstate->current_fh,
 651                                      create->cr_name, create->cr_namelen,
 652                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 653                 break;
 654
 655         case NF4FIFO:
 656                 status = nfsd_create(rqstp, &cstate->current_fh,
 657                                      create->cr_name, create->cr_namelen,
 658                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 659                 break;
 660
 661         case NF4DIR:
 662                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 663                 status = nfsd_create(rqstp, &cstate->current_fh,
 664                                      create->cr_name, create->cr_namelen,
 665                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 666                 break;
 667
 668         default:
 669                 status = nfserr_badtype;
 670         }
 671
 672         if (status)
 673                 goto out;
 674
 675         if (create->cr_label.len)
 676                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 677
 678         if (create->cr_acl != NULL)
 679                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 680                                 create->cr_bmval);
 681
 682         fh_unlock(&cstate->current_fh);
 683         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 684         fh_dup2(&cstate->current_fh, &resfh);
 685 out:
 686         fh_put(&resfh);
 687         return status;
 688 }
 689
 690 static __be32
 691 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 692               struct nfsd4_getattr *getattr)
 693 {
 694         __be32 status;
 695
 696         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 697         if (status)
 698                 return status;
 699
 700         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 701                 return nfserr_inval;
 702
 703         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 704         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 705         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 706
 707         getattr->ga_fhp = &cstate->current_fh;
 708         return nfs_ok;
 709 }
 710
 711 static __be32
 712 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 713            struct nfsd4_link *link)
 714 {
 715         __be32 status = nfserr_nofilehandle;
 716
 717         if (!cstate->save_fh.fh_dentry)
 718                 return status;
 719         status = nfsd_link(rqstp, &cstate->current_fh,
 720                            link->li_name, link->li_namelen, &cstate->save_fh);
 721         if (!status)
 722                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 723         return status;
 724 }
 725
 726 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 727 {
 728         struct svc_fh tmp_fh;
 729         __be32 ret;
 730
 731         fh_init(&tmp_fh, NFS4_FHSIZE);
 732         ret = exp_pseudoroot(rqstp, &tmp_fh);
 733         if (ret)
 734                 return ret;
 735         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 736                 fh_put(&tmp_fh);
 737                 return nfserr_noent;
 738         }
 739         fh_put(&tmp_fh);
 740         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 741 }
 742
 743 static __be32
 744 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 745               void *arg)
 746 {
 747         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 748 }
 749
 750 static __be32
 751 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 752              struct nfsd4_lookup *lookup)
 753 {
 754         return nfsd_lookup(rqstp, &cstate->current_fh,
 755                            lookup->lo_name, lookup->lo_len,
 756                            &cstate->current_fh);
 757 }
 758
 759 static __be32
 760 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 761            struct nfsd4_read *read)
 762 {
 763         __be32 status;
 764
 765         /* no need to check permission - this will be done in nfsd_read() */
 766
 767         read->rd_filp = NULL;
 768         if (read->rd_offset >= OFFSET_MAX)
 769                 return nfserr_inval;
 770
 771         /*
 772          * If we do a zero copy read, then a client will see read data
 773          * that reflects the state of the file *after* performing the
 774          * following compound.
 775          *
 776          * To ensure proper ordering, we therefore turn off zero copy if
 777          * the client wants us to do more in this compound:
 778          */
 779         if (!nfsd4_last_compound_op(rqstp))
 780                 rqstp->rq_splice_ok = false;
 781
 782         nfs4_lock_state();
 783         /* check stateid */
 784         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
 785                                                  cstate, &read->rd_stateid,
 786                                                  RD_STATE, &read->rd_filp))) {
 787                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 788                 goto out;
 789         }
 790         if (read->rd_filp)
 791                 get_file(read->rd_filp);
 792         status = nfs_ok;
 793 out:
 794         nfs4_unlock_state();
 795         read->rd_rqstp = rqstp;
 796         read->rd_fhp = &cstate->current_fh;
 797         return status;
 798 }
 799
 800 static __be32
 801 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 802               struct nfsd4_readdir *readdir)
 803 {
 804         u64 cookie = readdir->rd_cookie;
 805         static const nfs4_verifier zeroverf;
 806
 807         /* no need to check permission - this will be done in nfsd_readdir() */
 808
 809         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 810                 return nfserr_inval;
 811
 812         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 813         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 814         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 815
 816         if ((cookie == 1) || (cookie == 2) ||
 817             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 818                 return nfserr_bad_cookie;
 819
 820         readdir->rd_rqstp = rqstp;
 821         readdir->rd_fhp = &cstate->current_fh;
 822         return nfs_ok;
 823 }
 824
 825 static __be32
 826 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 827                struct nfsd4_readlink *readlink)
 828 {
 829         readlink->rl_rqstp = rqstp;
 830         readlink->rl_fhp = &cstate->current_fh;
 831         return nfs_ok;
 832 }
 833
 834 static __be32
 835 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 836              struct nfsd4_remove *remove)
 837 {
 838         __be32 status;
 839
 840         if (locks_in_grace(SVC_NET(rqstp)))
 841                 return nfserr_grace;
 842         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 843                              remove->rm_name, remove->rm_namelen);
 844         if (!status) {
 845                 fh_unlock(&cstate->current_fh);
 846                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 847         }
 848         return status;
 849 }
 850
 851 static __be32
 852 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 853              struct nfsd4_rename *rename)
 854 {
 855         __be32 status = nfserr_nofilehandle;
 856
 857         if (!cstate->save_fh.fh_dentry)
 858                 return status;
 859         if (locks_in_grace(SVC_NET(rqstp)) &&
 860                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 861                 return nfserr_grace;
 862         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 863                              rename->rn_snamelen, &cstate->current_fh,
 864                              rename->rn_tname, rename->rn_tnamelen);
 865         if (status)
 866                 return status;
 867         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 868         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 869         return nfs_ok;
 870 }
 871
 872 static __be32
 873 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 874               struct nfsd4_secinfo *secinfo)
 875 {
 876         struct svc_fh resfh;
 877         struct svc_export *exp;
 878         struct dentry *dentry;
 879         __be32 err;
 880
 881         fh_init(&resfh, NFS4_FHSIZE);
 882         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 883         if (err)
 884                 return err;
 885         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 886                                     secinfo->si_name, secinfo->si_namelen,
 887                                     &exp, &dentry);
 888         if (err)
 889                 return err;
 890         if (dentry->d_inode == NULL) {
 891                 exp_put(exp);
 892                 err = nfserr_noent;
 893         } else
 894                 secinfo->si_exp = exp;
 895         dput(dentry);
 896         if (cstate->minorversion)
 897                 /* See rfc 5661 section 2.6.3.1.1.8 */
 898                 fh_put(&cstate->current_fh);
 899         return err;
 900 }
 901
 902 static __be32
 903 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 904               struct nfsd4_secinfo_no_name *sin)
 905 {
 906         __be32 err;
 907
 908         switch (sin->sin_style) {
 909         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 910                 break;
 911         case NFS4_SECINFO_STYLE4_PARENT:
 912                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 913                 if (err)
 914                         return err;
 915                 break;
 916         default:
 917                 return nfserr_inval;
 918         }
 919         exp_get(cstate->current_fh.fh_export);
 920         sin->sin_exp = cstate->current_fh.fh_export;
 921         fh_put(&cstate->current_fh);
 922         return nfs_ok;
 923 }
 924
 925 static __be32
 926 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 927               struct nfsd4_setattr *setattr)
 928 {
 929         __be32 status = nfs_ok;
 930         int err;
 931
 932         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 933                 nfs4_lock_state();
 934                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
 935                         &setattr->sa_stateid, WR_STATE, NULL);
 936                 nfs4_unlock_state();
 937                 if (status) {
 938                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 939                         return status;
 940                 }
 941         }
 942         err = fh_want_write(&cstate->current_fh);
 943         if (err)
 944                 return nfserrno(err);
 945         status = nfs_ok;
 946
 947         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 948                                     nfsd_attrmask);
 949         if (status)
 950                 goto out;
 951
 952         if (setattr->sa_acl != NULL)
 953                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 954                                             setattr->sa_acl);
 955         if (status)
 956                 goto out;
 957         if (setattr->sa_label.len)
 958                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 959                                 &setattr->sa_label);
 960         if (status)
 961                 goto out;
 962         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 963                                 0, (time_t)0);
 964 out:
 965         fh_drop_write(&cstate->current_fh);
 966         return status;
 967 }
 968
 969 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 970 {
 971         int i = 1;
 972         int buflen = write->wr_buflen;
 973
 974         vec[0].iov_base = write->wr_head.iov_base;
 975         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 976         buflen -= vec[0].iov_len;
 977
 978         while (buflen) {
 979                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 980                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 981                 buflen -= vec[i].iov_len;
 982                 i++;
 983         }
 984         return i;
 985 }
 986
 987 static __be32
 988 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 989             struct nfsd4_write *write)
 990 {
 991         stateid_t *stateid = &write->wr_stateid;
 992         struct file *filp = NULL;
 993         __be32 status = nfs_ok;
 994         unsigned long cnt;
 995         int nvecs;
 996
 997         /* no need to check permission - this will be done in nfsd_write() */
 998
 999         if (write->wr_offset >= OFFSET_MAX)
1000                 return nfserr_inval;
1001
1002         nfs4_lock_state();
1003         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
1004                                         cstate, stateid, WR_STATE, &filp);
1005         if (status) {
1006                 nfs4_unlock_state();
1007                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1008                 return status;
1009         }
1010         if (filp)
1011                 get_file(filp);
1012         nfs4_unlock_state();
1013
1014         cnt = write->wr_buflen;
1015         write->wr_how_written = write->wr_stable_how;
1016         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1017
1018         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1019         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1020
1021         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1022                              write->wr_offset, rqstp->rq_vec, nvecs,
1023                              &cnt, &write->wr_how_written);
1024         if (filp)
1025                 fput(filp);
1026
1027         write->wr_bytes_written = cnt;
1028
1029         return status;
1030 }
1031
1032 /* This routine never returns NFS_OK!  If there are no other errors, it
1033  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1034  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1035  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1036  */
1037 static __be32
1038 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1039              struct nfsd4_verify *verify)
1040 {
1041         __be32 *buf, *p;
1042         int count;
1043         __be32 status;
1044
1045         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1046         if (status)
1047                 return status;
1048
1049         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1050         if (status)
1051                 return status;
1052
1053         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1054             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1055                 return nfserr_inval;
1056         if (verify->ve_attrlen & 3)
1057                 return nfserr_inval;
1058
1059         /* count in words:
1060          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1061          */
1062         count = 4 + (verify->ve_attrlen >> 2);
1063         buf = kmalloc(count << 2, GFP_KERNEL);
1064         if (!buf)
1065                 return nfserr_jukebox;
1066
1067         p = buf;
1068         status = nfsd4_encode_fattr(&cstate->current_fh,
1069                                     cstate->current_fh.fh_export,
1070                                     cstate->current_fh.fh_dentry, &p,
1071                                     count, verify->ve_bmval,
1072                                     rqstp, 0);
1073
1074         /* this means that nfsd4_encode_fattr() ran out of space */
1075         if (status == nfserr_resource)
1076                 status = nfserr_not_same;
1077         if (status)
1078                 goto out_kfree;
1079
1080         /* skip bitmap */
1081         p = buf + 1 + ntohl(buf[0]);
1082         status = nfserr_not_same;
1083         if (ntohl(*p++) != verify->ve_attrlen)
1084                 goto out_kfree;
1085         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1086                 status = nfserr_same;
1087
1088 out_kfree:
1089         kfree(buf);
1090         return status;
1091 }
1092
1093 static __be32
1094 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1095               struct nfsd4_verify *verify)
1096 {
1097         __be32 status;
1098
1099         status = _nfsd4_verify(rqstp, cstate, verify);
1100         return status == nfserr_not_same ? nfs_ok : status;
1101 }
1102
1103 static __be32
1104 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1105              struct nfsd4_verify *verify)
1106 {
1107         __be32 status;
1108
1109         status = _nfsd4_verify(rqstp, cstate, verify);
1110         return status == nfserr_same ? nfs_ok : status;
1111 }
1112
1113 /*
1114  * NULL call.
1115  */
1116 static __be32
1117 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1118 {
1119         return nfs_ok;
1120 }
1121
1122 static inline void nfsd4_increment_op_stats(u32 opnum)
1123 {
1124         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1125                 nfsdstats.nfs4_opcount[opnum]++;
1126 }
1127
1128 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1129                               void *);
1130 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1131 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1132 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1133
1134 enum nfsd4_op_flags {
1135         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1136         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1137         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1138         /* For rfc 5661 section 2.6.3.1.1: */
1139         OP_HANDLES_WRONGSEC = 1 << 3,
1140         OP_IS_PUTFH_LIKE = 1 << 4,
1141         /*
1142          * These are the ops whose result size we estimate before
1143          * encoding, to avoid performing an op then not being able to
1144          * respond or cache a response.  This includes writes and setattrs
1145          * as well as the operations usually called "nonidempotent":
1146          */
1147         OP_MODIFIES_SOMETHING = 1 << 5,
1148         /*
1149          * Cache compounds containing these ops in the xid-based drc:
1150          * We use the DRC for compounds containing non-idempotent
1151          * operations, *except* those that are 4.1-specific (since
1152          * sessions provide their own EOS), and except for stateful
1153          * operations other than setclientid and setclientid_confirm
1154          * (since sequence numbers provide EOS for open, lock, etc in
1155          * the v4.0 case).
1156          */
1157         OP_CACHEME = 1 << 6,
1158         /*
1159          * These are ops which clear current state id.
1160          */
1161         OP_CLEAR_STATEID = 1 << 7,
1162 };
1163
1164 struct nfsd4_operation {
1165         nfsd4op_func op_func;
1166         u32 op_flags;
1167         char *op_name;
1168         /* Try to get response size before operation */
1169         nfsd4op_rsize op_rsize_bop;
1170         stateid_getter op_get_currentstateid;
1171         stateid_setter op_set_currentstateid;
1172 };
1173
1174 static struct nfsd4_operation nfsd4_ops[];
1175
1176 #ifdef NFSD_DEBUG
1177 static const char *nfsd4_op_name(unsigned opnum);
1178 #endif
1179
1180 /*
1181  * Enforce NFSv4.1 COMPOUND ordering rules:
1182  *
1183  * Also note, enforced elsewhere:
1184  *      - SEQUENCE other than as first op results in
1185  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1186  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1187  *        (Enforced in nfsd4_bind_conn_to_session().)
1188  *      - DESTROY_SESSION must be the final operation in a compound, if
1189  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1190  *        (Enforced in nfsd4_destroy_session().)
1191  */
1192 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1193 {
1194         struct nfsd4_op *op = &args->ops[0];
1195
1196         /* These ordering requirements don't apply to NFSv4.0: */
1197         if (args->minorversion == 0)
1198                 return nfs_ok;
1199         /* This is weird, but OK, not our problem: */
1200         if (args->opcnt == 0)
1201                 return nfs_ok;
1202         if (op->status == nfserr_op_illegal)
1203                 return nfs_ok;
1204         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1205                 return nfserr_op_not_in_session;
1206         if (op->opnum == OP_SEQUENCE)
1207                 return nfs_ok;
1208         if (args->opcnt != 1)
1209                 return nfserr_not_only_op;
1210         return nfs_ok;
1211 }
1212
1213 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1214 {
1215         return &nfsd4_ops[op->opnum];
1216 }
1217
1218 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1219 {
1220         return OPDESC(op)->op_flags & OP_CACHEME;
1221 }
1222
1223 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1224 {
1225         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1226         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1227         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1228         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1229         struct nfsd4_operation *thisd;
1230         struct nfsd4_operation *nextd;
1231
1232         thisd = OPDESC(this);
1233         /*
1234          * Most ops check wronsec on our own; only the putfh-like ops
1235          * have special rules.
1236          */
1237         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1238                 return false;
1239         /*
1240          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1241          * put-filehandle operation if we're not going to use the
1242          * result:
1243          */
1244         if (argp->opcnt == resp->opcnt)
1245                 return false;
1246
1247         nextd = OPDESC(next);
1248         /*
1249          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1250          * errors themselves as necessary; others should check for them
1251          * now:
1252          */
1253         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1254 }
1255
1256 /*
1257  * COMPOUND call.
1258  */
1259 static __be32
1260 nfsd4_proc_compound(struct svc_rqst *rqstp,
1261                     struct nfsd4_compoundargs *args,
1262                     struct nfsd4_compoundres *resp)
1263 {
1264         struct nfsd4_op *op;
1265         struct nfsd4_operation *opdesc;
1266         struct nfsd4_compound_state *cstate = &resp->cstate;
1267         int             slack_bytes;
1268         u32             plen = 0;
1269         __be32          status;
1270
1271         resp->xbuf = &rqstp->rq_res;
1272         resp->p = rqstp->rq_res.head[0].iov_base +
1273                                                 rqstp->rq_res.head[0].iov_len;
1274         resp->tagp = resp->p;
1275         /* reserve space for: taglen, tag, and opcnt */
1276         resp->p += 2 + XDR_QUADLEN(args->taglen);
1277         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1278         resp->taglen = args->taglen;
1279         resp->tag = args->tag;
1280         resp->opcnt = 0;
1281         resp->rqstp = rqstp;
1282         resp->cstate.minorversion = args->minorversion;
1283         resp->cstate.replay_owner = NULL;
1284         resp->cstate.session = NULL;
1285         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1286         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1287         /*
1288          * Don't use the deferral mechanism for NFSv4; compounds make it
1289          * too hard to avoid non-idempotency problems.
1290          */
1291         rqstp->rq_usedeferral = 0;
1292
1293         /*
1294          * According to RFC3010, this takes precedence over all other errors.
1295          */
1296         status = nfserr_minor_vers_mismatch;
1297         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1298                 goto out;
1299
1300         status = nfs41_check_op_ordering(args);
1301         if (status) {
1302                 op = &args->ops[0];
1303                 op->status = status;
1304                 goto encode_op;
1305         }
1306
1307         while (!status && resp->opcnt < args->opcnt) {
1308                 op = &args->ops[resp->opcnt++];
1309
1310                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1311                         resp->opcnt, args->opcnt, op->opnum,
1312                         nfsd4_op_name(op->opnum));
1313                 /*
1314                  * The XDR decode routines may have pre-set op->status;
1315                  * for example, if there is a miscellaneous XDR error
1316                  * it will be set to nfserr_bad_xdr.
1317                  */
1318                 if (op->status) {
1319                         if (op->opnum == OP_OPEN)
1320                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1321                         goto encode_op;
1322                 }
1323
1324                 /* We must be able to encode a successful response to
1325                  * this operation, with enough room left over to encode a
1326                  * failed response to the next operation.  If we don't
1327                  * have enough room, fail with ERR_RESOURCE.
1328                  */
1329                 slack_bytes = (char *)resp->end - (char *)resp->p;
1330                 if (slack_bytes < COMPOUND_SLACK_SPACE
1331                                 + COMPOUND_ERR_SLACK_SPACE) {
1332                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1333                         op->status = nfserr_resource;
1334                         goto encode_op;
1335                 }
1336
1337                 opdesc = OPDESC(op);
1338
1339                 if (!cstate->current_fh.fh_dentry) {
1340                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1341                                 op->status = nfserr_nofilehandle;
1342                                 goto encode_op;
1343                         }
1344                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1345                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1346                         op->status = nfserr_moved;
1347                         goto encode_op;
1348                 }
1349
1350                 /* If op is non-idempotent */
1351                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1352                         plen = opdesc->op_rsize_bop(rqstp, op);
1353                         op->status = nfsd4_check_resp_size(resp, plen);
1354                 }
1355
1356                 if (op->status)
1357                         goto encode_op;
1358
1359                 if (opdesc->op_get_currentstateid)
1360                         opdesc->op_get_currentstateid(cstate, &op->u);
1361                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1362
1363                 if (!op->status) {
1364                         if (opdesc->op_set_currentstateid)
1365                                 opdesc->op_set_currentstateid(cstate, &op->u);
1366
1367                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1368                                 clear_current_stateid(cstate);
1369
1370                         if (need_wrongsec_check(rqstp))
1371                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1372                 }
1373
1374 encode_op:
1375                 /* Only from SEQUENCE */
1376                 if (resp->cstate.status == nfserr_replay_cache) {
1377                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1378                         status = op->status;
1379                         goto out;
1380                 }
1381                 if (op->status == nfserr_replay_me) {
1382                         op->replay = &cstate->replay_owner->so_replay;
1383                         nfsd4_encode_replay(resp, op);
1384                         status = op->status = op->replay->rp_status;
1385                 } else {
1386                         nfsd4_encode_operation(resp, op);
1387                         status = op->status;
1388                 }
1389
1390                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1391                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1392                         be32_to_cpu(status));
1393
1394                 if (cstate->replay_owner) {
1395                         nfs4_unlock_state();
1396                         cstate->replay_owner = NULL;
1397                 }
1398                 /* XXX Ugh, we need to get rid of this kind of special case: */
1399                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1400                         fput(op->u.read.rd_filp);
1401
1402                 nfsd4_increment_op_stats(op->opnum);
1403         }
1404
1405         resp->cstate.status = status;
1406         fh_put(&resp->cstate.current_fh);
1407         fh_put(&resp->cstate.save_fh);
1408         BUG_ON(resp->cstate.replay_owner);
1409 out:
1410         /* Reset deferral mechanism for RPC deferrals */
1411         rqstp->rq_usedeferral = 1;
1412         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1413         return status;
1414 }
1415
1416 #define op_encode_hdr_size              (2)
1417 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1418 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1419 #define op_encode_change_info_maxsz     (5)
1420 #define nfs4_fattr_bitmap_maxsz         (4)
1421
1422 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1423 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1424
1425 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1426
1427 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1428 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1429                                          op_encode_ace_maxsz)
1430
1431 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1432
1433 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1434 {
1435         return (op_encode_hdr_size) * sizeof(__be32);
1436 }
1437
1438 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1439 {
1440         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1441 }
1442
1443 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1444 {
1445         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1446 }
1447
1448 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1449 {
1450         return (op_encode_hdr_size + op_encode_change_info_maxsz
1451                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1452 }
1453
1454 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1455 {
1456         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1457                 * sizeof(__be32);
1458 }
1459
1460 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1461 {
1462         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1463                 * sizeof(__be32);
1464 }
1465
1466 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1467 {
1468         return (op_encode_hdr_size + op_encode_stateid_maxsz
1469                 + op_encode_change_info_maxsz + 1
1470                 + nfs4_fattr_bitmap_maxsz
1471                 + op_encode_delegation_maxsz) * sizeof(__be32);
1472 }
1473
1474 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1475 {
1476         u32 maxcount = 0, rlen = 0;
1477
1478         maxcount = svc_max_payload(rqstp);
1479         rlen = op->u.read.rd_length;
1480
1481         if (rlen > maxcount)
1482                 rlen = maxcount;
1483
1484         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1485 }
1486
1487 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1488 {
1489         u32 rlen = op->u.readdir.rd_maxcount;
1490
1491         if (rlen > PAGE_SIZE)
1492                 rlen = PAGE_SIZE;
1493
1494         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1495                  * sizeof(__be32) + rlen;
1496 }
1497
1498 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1499 {
1500         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1501                 * sizeof(__be32);
1502 }
1503
1504 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1505 {
1506         return (op_encode_hdr_size + op_encode_change_info_maxsz
1507                 + op_encode_change_info_maxsz) * sizeof(__be32);
1508 }
1509
1510 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1511 {
1512         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1513 }
1514
1515 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1516 {
1517         return (op_encode_hdr_size + 2 + 1024) * sizeof(__be32);
1518 }
1519
1520 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1521 {
1522         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1523 }
1524
1525 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1526 {
1527         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1528                 1 + 1 + 2 + /* eir_flags, spr_how, spo_must_enforce & _allow */\
1529                 2 + /*eir_server_owner.so_minor_id */\
1530                 /* eir_server_owner.so_major_id<> */\
1531                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1532                 /* eir_server_scope<> */\
1533                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1534                 1 + /* eir_server_impl_id array length */\
1535                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1536 }
1537
1538 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1539 {
1540         return (op_encode_hdr_size + \
1541                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1542                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1543 }
1544
1545 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1546 {
1547         return (op_encode_hdr_size + \
1548                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1549                 2 + /* csr_sequence, csr_flags */\
1550                 op_encode_channel_attrs_maxsz + \
1551                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1552 }
1553
1554 static struct nfsd4_operation nfsd4_ops[] = {
1555         [OP_ACCESS] = {
1556                 .op_func = (nfsd4op_func)nfsd4_access,
1557                 .op_name = "OP_ACCESS",
1558         },
1559         [OP_CLOSE] = {
1560                 .op_func = (nfsd4op_func)nfsd4_close,
1561                 .op_flags = OP_MODIFIES_SOMETHING,
1562                 .op_name = "OP_CLOSE",
1563                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1564                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1565                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1566         },
1567         [OP_COMMIT] = {
1568                 .op_func = (nfsd4op_func)nfsd4_commit,
1569                 .op_flags = OP_MODIFIES_SOMETHING,
1570                 .op_name = "OP_COMMIT",
1571                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1572         },
1573         [OP_CREATE] = {
1574                 .op_func = (nfsd4op_func)nfsd4_create,
1575                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1576                 .op_name = "OP_CREATE",
1577                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1578         },
1579         [OP_DELEGRETURN] = {
1580                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1581                 .op_flags = OP_MODIFIES_SOMETHING,
1582                 .op_name = "OP_DELEGRETURN",
1583                 .op_rsize_bop = nfsd4_only_status_rsize,
1584                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1585         },
1586         [OP_GETATTR] = {
1587                 .op_func = (nfsd4op_func)nfsd4_getattr,
1588                 .op_flags = ALLOWED_ON_ABSENT_FS,
1589                 .op_name = "OP_GETATTR",
1590         },
1591         [OP_GETFH] = {
1592                 .op_func = (nfsd4op_func)nfsd4_getfh,
1593                 .op_name = "OP_GETFH",
1594         },
1595         [OP_LINK] = {
1596                 .op_func = (nfsd4op_func)nfsd4_link,
1597                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1598                                 | OP_CACHEME,
1599                 .op_name = "OP_LINK",
1600                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1601         },
1602         [OP_LOCK] = {
1603                 .op_func = (nfsd4op_func)nfsd4_lock,
1604                 .op_flags = OP_MODIFIES_SOMETHING,
1605                 .op_name = "OP_LOCK",
1606                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1607                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1608         },
1609         [OP_LOCKT] = {
1610                 .op_func = (nfsd4op_func)nfsd4_lockt,
1611                 .op_name = "OP_LOCKT",
1612         },
1613         [OP_LOCKU] = {
1614                 .op_func = (nfsd4op_func)nfsd4_locku,
1615                 .op_flags = OP_MODIFIES_SOMETHING,
1616                 .op_name = "OP_LOCKU",
1617                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1618                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1619         },
1620         [OP_LOOKUP] = {
1621                 .op_func = (nfsd4op_func)nfsd4_lookup,
1622                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1623                 .op_name = "OP_LOOKUP",
1624         },
1625         [OP_LOOKUPP] = {
1626                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1627                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1628                 .op_name = "OP_LOOKUPP",
1629         },
1630         [OP_NVERIFY] = {
1631                 .op_func = (nfsd4op_func)nfsd4_nverify,
1632                 .op_name = "OP_NVERIFY",
1633         },
1634         [OP_OPEN] = {
1635                 .op_func = (nfsd4op_func)nfsd4_open,
1636                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1637                 .op_name = "OP_OPEN",
1638                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1639                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1640         },
1641         [OP_OPEN_CONFIRM] = {
1642                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1643                 .op_flags = OP_MODIFIES_SOMETHING,
1644                 .op_name = "OP_OPEN_CONFIRM",
1645                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1646         },
1647         [OP_OPEN_DOWNGRADE] = {
1648                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1649                 .op_flags = OP_MODIFIES_SOMETHING,
1650                 .op_name = "OP_OPEN_DOWNGRADE",
1651                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1652                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1653                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1654         },
1655         [OP_PUTFH] = {
1656                 .op_func = (nfsd4op_func)nfsd4_putfh,
1657                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1658                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1659                                 | OP_CLEAR_STATEID,
1660                 .op_name = "OP_PUTFH",
1661                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1662         },
1663         [OP_PUTPUBFH] = {
1664                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1665                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1666                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1667                                 | OP_CLEAR_STATEID,
1668                 .op_name = "OP_PUTPUBFH",
1669                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1670         },
1671         [OP_PUTROOTFH] = {
1672                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1673                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1674                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1675                                 | OP_CLEAR_STATEID,
1676                 .op_name = "OP_PUTROOTFH",
1677                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1678         },
1679         [OP_READ] = {
1680                 .op_func = (nfsd4op_func)nfsd4_read,
1681                 .op_flags = OP_MODIFIES_SOMETHING,
1682                 .op_name = "OP_READ",
1683                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1684                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1685         },
1686         [OP_READDIR] = {
1687                 .op_func = (nfsd4op_func)nfsd4_readdir,
1688                 .op_flags = OP_MODIFIES_SOMETHING,
1689                 .op_name = "OP_READDIR",
1690                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1691         },
1692         [OP_READLINK] = {
1693                 .op_func = (nfsd4op_func)nfsd4_readlink,
1694                 .op_name = "OP_READLINK",
1695         },
1696         [OP_REMOVE] = {
1697                 .op_func = (nfsd4op_func)nfsd4_remove,
1698                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1699                 .op_name = "OP_REMOVE",
1700                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1701         },
1702         [OP_RENAME] = {
1703                 .op_func = (nfsd4op_func)nfsd4_rename,
1704                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1705                 .op_name = "OP_RENAME",
1706                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1707         },
1708         [OP_RENEW] = {
1709                 .op_func = (nfsd4op_func)nfsd4_renew,
1710                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1711                                 | OP_MODIFIES_SOMETHING,
1712                 .op_name = "OP_RENEW",
1713                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1714
1715         },
1716         [OP_RESTOREFH] = {
1717                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1718                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1719                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1720                 .op_name = "OP_RESTOREFH",
1721                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1722         },
1723         [OP_SAVEFH] = {
1724                 .op_func = (nfsd4op_func)nfsd4_savefh,
1725                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1726                 .op_name = "OP_SAVEFH",
1727                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1728         },
1729         [OP_SECINFO] = {
1730                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1731                 .op_flags = OP_HANDLES_WRONGSEC,
1732                 .op_name = "OP_SECINFO",
1733         },
1734         [OP_SETATTR] = {
1735                 .op_func = (nfsd4op_func)nfsd4_setattr,
1736                 .op_name = "OP_SETATTR",
1737                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1738                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1739                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1740         },
1741         [OP_SETCLIENTID] = {
1742                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1743                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1744                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1745                 .op_name = "OP_SETCLIENTID",
1746                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1747         },
1748         [OP_SETCLIENTID_CONFIRM] = {
1749                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1750                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1751                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1752                 .op_name = "OP_SETCLIENTID_CONFIRM",
1753                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1754         },
1755         [OP_VERIFY] = {
1756                 .op_func = (nfsd4op_func)nfsd4_verify,
1757                 .op_name = "OP_VERIFY",
1758         },
1759         [OP_WRITE] = {
1760                 .op_func = (nfsd4op_func)nfsd4_write,
1761                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1762                 .op_name = "OP_WRITE",
1763                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1764                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1765         },
1766         [OP_RELEASE_LOCKOWNER] = {
1767                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1768                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1769                                 | OP_MODIFIES_SOMETHING,
1770                 .op_name = "OP_RELEASE_LOCKOWNER",
1771                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1772         },
1773
1774         /* NFSv4.1 operations */
1775         [OP_EXCHANGE_ID] = {
1776                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1777                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1778                                 | OP_MODIFIES_SOMETHING,
1779                 .op_name = "OP_EXCHANGE_ID",
1780                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1781         },
1782         [OP_BACKCHANNEL_CTL] = {
1783                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1784                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1785                 .op_name = "OP_BACKCHANNEL_CTL",
1786                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1787         },
1788         [OP_BIND_CONN_TO_SESSION] = {
1789                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1790                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1791                                 | OP_MODIFIES_SOMETHING,
1792                 .op_name = "OP_BIND_CONN_TO_SESSION",
1793                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1794         },
1795         [OP_CREATE_SESSION] = {
1796                 .op_func = (nfsd4op_func)nfsd4_create_session,
1797                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1798                                 | OP_MODIFIES_SOMETHING,
1799                 .op_name = "OP_CREATE_SESSION",
1800                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1801         },
1802         [OP_DESTROY_SESSION] = {
1803                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1804                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1805                                 | OP_MODIFIES_SOMETHING,
1806                 .op_name = "OP_DESTROY_SESSION",
1807                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1808         },
1809         [OP_SEQUENCE] = {
1810                 .op_func = (nfsd4op_func)nfsd4_sequence,
1811                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1812                 .op_name = "OP_SEQUENCE",
1813         },
1814         [OP_DESTROY_CLIENTID] = {
1815                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1816                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1817                                 | OP_MODIFIES_SOMETHING,
1818                 .op_name = "OP_DESTROY_CLIENTID",
1819                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1820         },
1821         [OP_RECLAIM_COMPLETE] = {
1822                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1823                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1824                 .op_name = "OP_RECLAIM_COMPLETE",
1825                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1826         },
1827         [OP_SECINFO_NO_NAME] = {
1828                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1829                 .op_flags = OP_HANDLES_WRONGSEC,
1830                 .op_name = "OP_SECINFO_NO_NAME",
1831         },
1832         [OP_TEST_STATEID] = {
1833                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1834                 .op_flags = ALLOWED_WITHOUT_FH,
1835                 .op_name = "OP_TEST_STATEID",
1836         },
1837         [OP_FREE_STATEID] = {
1838                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1839                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1840                 .op_name = "OP_FREE_STATEID",
1841                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1842                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1843         },
1844 };
1845
1846 #ifdef NFSD_DEBUG
1847 static const char *nfsd4_op_name(unsigned opnum)
1848 {
1849         if (opnum < ARRAY_SIZE(nfsd4_ops))
1850                 return nfsd4_ops[opnum].op_name;
1851         return "unknown_operation";
1852 }
1853 #endif
1854
1855 #define nfsd4_voidres                   nfsd4_voidargs
1856 struct nfsd4_voidargs { int dummy; };
1857
1858 static struct svc_procedure             nfsd_procedures4[2] = {
1859         [NFSPROC4_NULL] = {
1860                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1861                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1862                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1863                 .pc_ressize = sizeof(struct nfsd4_voidres),
1864                 .pc_cachetype = RC_NOCACHE,
1865                 .pc_xdrressize = 1,
1866         },
1867         [NFSPROC4_COMPOUND] = {
1868                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1869                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1870                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1871                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1872                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1873                 .pc_release = nfsd4_release_compoundargs,
1874                 .pc_cachetype = RC_NOCACHE,
1875                 .pc_xdrressize = NFSD_BUFSIZE/4,
1876         },
1877 };
1878
1879 struct svc_version      nfsd_version4 = {
1880                 .vs_vers        = 4,
1881                 .vs_nproc       = 2,
1882                 .vs_proc        = nfsd_procedures4,
1883                 .vs_dispatch    = nfsd_dispatch,
1884                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1885 };
1886
1887 /*
1888  * Local variables:
1889  *  c-basic-offset: 8
1890  * End:
1891  */