kernel/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/falloc.h>
  37 #include <linux/slab.h>
  38
  39 #include "idmap.h"
  40 #include "cache.h"
  41 #include "xdr4.h"
  42 #include "vfs.h"
  43 #include "current_stateid.h"
  44 #include "netns.h"
  45 #include "acl.h"
  46 #include "pnfs.h"
  47 #include "trace.h"
  48
  49 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
  50 #include <linux/security.h>
  51
  52 static inline void
  53 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  54 {
  55         struct inode *inode = d_inode(resfh->fh_dentry);
  56         int status;
  57
  58         mutex_lock(&inode->i_mutex);
  59         status = security_inode_setsecctx(resfh->fh_dentry,
  60                 label->data, label->len);
  61         mutex_unlock(&inode->i_mutex);
  62
  63         if (status)
  64                 /*
  65                  * XXX: We should really fail the whole open, but we may
  66                  * already have created a new file, so it may be too
  67                  * late.  For now this seems the least of evils:
  68                  */
  69                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  70
  71         return;
  72 }
  73 #else
  74 static inline void
  75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  76 { }
  77 #endif
  78
  79 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  80
  81 static u32 nfsd_attrmask[] = {
  82         NFSD_WRITEABLE_ATTRS_WORD0,
  83         NFSD_WRITEABLE_ATTRS_WORD1,
  84         NFSD_WRITEABLE_ATTRS_WORD2
  85 };
  86
  87 static u32 nfsd41_ex_attrmask[] = {
  88         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  89         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD2
  91 };
  92
  93 static __be32
  94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  95                    u32 *bmval, u32 *writable)
  96 {
  97         struct dentry *dentry = cstate->current_fh.fh_dentry;
  98
  99         /*
 100          * Check about attributes are supported by the NFSv4 server or not.
 101          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 102          */
 103         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 104             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 105             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 106                 return nfserr_attrnotsupp;
 107
 108         /*
 109          * Check FATTR4_WORD0_ACL can be supported
 110          * in current environment or not.
 111          */
 112         if (bmval[0] & FATTR4_WORD0_ACL) {
 113                 if (!IS_POSIXACL(d_inode(dentry)))
 114                         return nfserr_attrnotsupp;
 115         }
 116
 117         /*
 118          * According to spec, read-only attributes return ERR_INVAL.
 119          */
 120         if (writable) {
 121                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 122                     (bmval[2] & ~writable[2]))
 123                         return nfserr_inval;
 124         }
 125
 126         return nfs_ok;
 127 }
 128
 129 static __be32
 130 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 131         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 132 {
 133         __be32 status = nfs_ok;
 134
 135         if (open->op_create == NFS4_OPEN_CREATE) {
 136                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 137                     || open->op_createmode == NFS4_CREATE_GUARDED)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd_attrmask);
 140                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 141                         status = check_attr_support(rqstp, cstate,
 142                                         open->op_bmval, nfsd41_ex_attrmask);
 143         }
 144
 145         return status;
 146 }
 147
 148 static int
 149 is_create_with_attrs(struct nfsd4_open *open)
 150 {
 151         return open->op_create == NFS4_OPEN_CREATE
 152                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 153                     || open->op_createmode == NFS4_CREATE_GUARDED
 154                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 155 }
 156
 157 /*
 158  * if error occurs when setting the acl, just clear the acl bit
 159  * in the returned attr bitmap.
 160  */
 161 static void
 162 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 163                 struct nfs4_acl *acl, u32 *bmval)
 164 {
 165         __be32 status;
 166
 167         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 168         if (status)
 169                 /*
 170                  * We should probably fail the whole open at this point,
 171                  * but we've already created the file, so it's too late;
 172                  * So this seems the least of evils:
 173                  */
 174                 bmval[0] &= ~FATTR4_WORD0_ACL;
 175 }
 176
 177 static inline void
 178 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 179 {
 180         fh_put(dst);
 181         dget(src->fh_dentry);
 182         if (src->fh_export)
 183                 exp_get(src->fh_export);
 184         *dst = *src;
 185 }
 186
 187 static __be32
 188 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 189 {
 190         __be32 status;
 191
 192         if (open->op_truncate &&
 193                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 194                 return nfserr_inval;
 195
 196         accmode |= NFSD_MAY_READ_IF_EXEC;
 197
 198         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 199                 accmode |= NFSD_MAY_READ;
 200         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 201                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 202         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 203                 accmode |= NFSD_MAY_WRITE;
 204
 205         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 206
 207         return status;
 208 }
 209
 210 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 211 {
 212         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 213
 214         if (S_ISREG(mode))
 215                 return nfs_ok;
 216         if (S_ISDIR(mode))
 217                 return nfserr_isdir;
 218         /*
 219          * Using err_symlink as our catch-all case may look odd; but
 220          * there's no other obvious error for this case in 4.0, and we
 221          * happen to know that it will cause the linux v4 client to do
 222          * the right thing on attempts to open something other than a
 223          * regular file.
 224          */
 225         return nfserr_symlink;
 226 }
 227
 228 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 229 {
 230         if (nfsd4_has_session(cstate))
 231                 return;
 232         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 233                         &resfh->fh_handle);
 234 }
 235
 236 static __be32
 237 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 238 {
 239         struct svc_fh *current_fh = &cstate->current_fh;
 240         int accmode;
 241         __be32 status;
 242
 243         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 244         if (!*resfh)
 245                 return nfserr_jukebox;
 246         fh_init(*resfh, NFS4_FHSIZE);
 247         open->op_truncate = 0;
 248
 249         if (open->op_create) {
 250                 /* FIXME: check session persistence and pnfs flags.
 251                  * The nfsv4.1 spec requires the following semantics:
 252                  *
 253                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 254                  * Reply Cache  | server |                 |
 255                  * -------------+--------+-----------------+--------------------
 256                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 257                  *              |        |                 | (SHOULD)
 258                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 259                  *              |        |                 | (SHOULD NOT)
 260                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 261                  * yes          | no     | GUARDED4        | GUARDED4
 262                  * yes          | yes    | GUARDED4        | GUARDED4
 263                  */
 264
 265                 /*
 266                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 267                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 268                  */
 269                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 270                                         open->op_fname.len, &open->op_iattr,
 271                                         *resfh, open->op_createmode,
 272                                         (u32 *)open->op_verf.data,
 273                                         &open->op_truncate, &open->op_created);
 274
 275                 if (!status && open->op_label.len)
 276                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 277
 278                 /*
 279                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 280                  * use the returned bitmask to indicate which attributes
 281                  * we used to store the verifier:
 282                  */
 283                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 284                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 285                                                 FATTR4_WORD1_TIME_MODIFY);
 286         } else
 287                 /*
 288                  * Note this may exit with the parent still locked.
 289                  * We will hold the lock until nfsd4_open's final
 290                  * lookup, to prevent renames or unlinks until we've had
 291                  * a chance to an acquire a delegation if appropriate.
 292                  */
 293                 status = nfsd_lookup(rqstp, current_fh,
 294                                      open->op_fname.data, open->op_fname.len, *resfh);
 295         if (status)
 296                 goto out;
 297         status = nfsd_check_obj_isreg(*resfh);
 298         if (status)
 299                 goto out;
 300
 301         if (is_create_with_attrs(open) && open->op_acl != NULL)
 302                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 303
 304         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 305         accmode = NFSD_MAY_NOP;
 306         if (open->op_created ||
 307                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 308                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 309         status = do_open_permission(rqstp, *resfh, open, accmode);
 310         set_change_info(&open->op_cinfo, current_fh);
 311 out:
 312         return status;
 313 }
 314
 315 static __be32
 316 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 317 {
 318         struct svc_fh *current_fh = &cstate->current_fh;
 319         __be32 status;
 320         int accmode = 0;
 321
 322         /* We don't know the target directory, and therefore can not
 323         * set the change info
 324         */
 325
 326         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 327
 328         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 329
 330         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 331                 (open->op_iattr.ia_size == 0);
 332         /*
 333          * In the delegation case, the client is telling us about an
 334          * open that it *already* performed locally, some time ago.  We
 335          * should let it succeed now if possible.
 336          *
 337          * In the case of a CLAIM_FH open, on the other hand, the client
 338          * may be counting on us to enforce permissions (the Linux 4.1
 339          * client uses this for normal opens, for example).
 340          */
 341         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 342                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 343
 344         status = do_open_permission(rqstp, current_fh, open, accmode);
 345
 346         return status;
 347 }
 348
 349 static void
 350 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 351 {
 352         struct nfsd4_sessionid *sid =
 353                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 354
 355         clid->cl_boot = sid->clientid.cl_boot;
 356         clid->cl_id = sid->clientid.cl_id;
 357 }
 358
 359 static __be32
 360 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 361            struct nfsd4_open *open)
 362 {
 363         __be32 status;
 364         struct svc_fh *resfh = NULL;
 365         struct net *net = SVC_NET(rqstp);
 366         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 367
 368         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 369                 (int)open->op_fname.len, open->op_fname.data,
 370                 open->op_openowner);
 371
 372         /* This check required by spec. */
 373         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 374                 return nfserr_inval;
 375
 376         open->op_created = 0;
 377         /*
 378          * RFC5661 18.51.3
 379          * Before RECLAIM_COMPLETE done, server should deny new lock
 380          */
 381         if (nfsd4_has_session(cstate) &&
 382             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 383                       &cstate->session->se_client->cl_flags) &&
 384             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 385                 return nfserr_grace;
 386
 387         if (nfsd4_has_session(cstate))
 388                 copy_clientid(&open->op_clientid, cstate->session);
 389
 390         /* check seqid for replay. set nfs4_owner */
 391         status = nfsd4_process_open1(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 (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 419                 goto out;
 420         status = nfserr_no_grace;
 421         if (!opens_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, &resfh);
 428                         if (status)
 429                                 goto out;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_PREVIOUS:
 432                         status = nfs4_check_open_reclaim(&open->op_clientid,
 433                                                          cstate, nn);
 434                         if (status)
 435                                 goto out;
 436                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 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                         resfh = &cstate->current_fh;
 443                         break;
 444                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 445                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 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, resfh, open);
 462         WARN(status && open->op_created,
 463              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 464              be32_to_cpu(status));
 465 out:
 466         if (resfh && resfh != &cstate->current_fh) {
 467                 fh_dup2(&cstate->current_fh, resfh);
 468                 fh_put(resfh);
 469                 kfree(resfh);
 470         }
 471         nfsd4_cleanup_open_state(cstate, open);
 472         nfsd4_bump_seqid(cstate, status);
 473         return status;
 474 }
 475
 476 /*
 477  * OPEN is the only seqid-mutating operation whose decoding can fail
 478  * with a seqid-mutating error (specifically, decoding of user names in
 479  * the attributes).  Therefore we have to do some processing to look up
 480  * the stateowner so that we can bump the seqid.
 481  */
 482 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 483 {
 484         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 485
 486         if (!seqid_mutating_err(ntohl(op->status)))
 487                 return op->status;
 488         if (nfsd4_has_session(cstate))
 489                 return op->status;
 490         open->op_xdr_error = op->status;
 491         return nfsd4_open(rqstp, cstate, open);
 492 }
 493
 494 /*
 495  * filehandle-manipulating ops.
 496  */
 497 static __be32
 498 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499             struct svc_fh **getfh)
 500 {
 501         if (!cstate->current_fh.fh_dentry)
 502                 return nfserr_nofilehandle;
 503
 504         *getfh = &cstate->current_fh;
 505         return nfs_ok;
 506 }
 507
 508 static __be32
 509 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510             struct nfsd4_putfh *putfh)
 511 {
 512         fh_put(&cstate->current_fh);
 513         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 514         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 515                putfh->pf_fhlen);
 516         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 517 }
 518
 519 static __be32
 520 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521                 void *arg)
 522 {
 523         __be32 status;
 524
 525         fh_put(&cstate->current_fh);
 526         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 527         return status;
 528 }
 529
 530 static __be32
 531 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 532                 void *arg)
 533 {
 534         if (!cstate->save_fh.fh_dentry)
 535                 return nfserr_restorefh;
 536
 537         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 538         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 539                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 540                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 541         }
 542         return nfs_ok;
 543 }
 544
 545 static __be32
 546 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 547              void *arg)
 548 {
 549         if (!cstate->current_fh.fh_dentry)
 550                 return nfserr_nofilehandle;
 551
 552         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 553         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 554                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 555                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 556         }
 557         return nfs_ok;
 558 }
 559
 560 /*
 561  * misc nfsv4 ops
 562  */
 563 static __be32
 564 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 565              struct nfsd4_access *access)
 566 {
 567         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 568                 return nfserr_inval;
 569
 570         access->ac_resp_access = access->ac_req_access;
 571         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 572                            &access->ac_supported);
 573 }
 574
 575 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 576 {
 577         __be32 verf[2];
 578         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 579
 580         /*
 581          * This is opaque to client, so no need to byte-swap. Use
 582          * __force to keep sparse happy
 583          */
 584         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 585         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 586         memcpy(verifier->data, verf, sizeof(verifier->data));
 587 }
 588
 589 static __be32
 590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              struct nfsd4_commit *commit)
 592 {
 593         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595                              commit->co_count);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_create *create)
 601 {
 602         struct svc_fh resfh;
 603         __be32 status;
 604         dev_t rdev;
 605
 606         fh_init(&resfh, NFS4_FHSIZE);
 607
 608         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 609                            NFSD_MAY_CREATE);
 610         if (status)
 611                 return status;
 612
 613         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 614                                     nfsd_attrmask);
 615         if (status)
 616                 return status;
 617
 618         switch (create->cr_type) {
 619         case NF4LNK:
 620                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 621                                       create->cr_name, create->cr_namelen,
 622                                       create->cr_data, &resfh);
 623                 break;
 624
 625         case NF4BLK:
 626                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 627                 if (MAJOR(rdev) != create->cr_specdata1 ||
 628                     MINOR(rdev) != create->cr_specdata2)
 629                         return nfserr_inval;
 630                 status = nfsd_create(rqstp, &cstate->current_fh,
 631                                      create->cr_name, create->cr_namelen,
 632                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 633                 break;
 634
 635         case NF4CHR:
 636                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 637                 if (MAJOR(rdev) != create->cr_specdata1 ||
 638                     MINOR(rdev) != create->cr_specdata2)
 639                         return nfserr_inval;
 640                 status = nfsd_create(rqstp, &cstate->current_fh,
 641                                      create->cr_name, create->cr_namelen,
 642                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 643                 break;
 644
 645         case NF4SOCK:
 646                 status = nfsd_create(rqstp, &cstate->current_fh,
 647                                      create->cr_name, create->cr_namelen,
 648                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 649                 break;
 650
 651         case NF4FIFO:
 652                 status = nfsd_create(rqstp, &cstate->current_fh,
 653                                      create->cr_name, create->cr_namelen,
 654                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 655                 break;
 656
 657         case NF4DIR:
 658                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 659                 status = nfsd_create(rqstp, &cstate->current_fh,
 660                                      create->cr_name, create->cr_namelen,
 661                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 662                 break;
 663
 664         default:
 665                 status = nfserr_badtype;
 666         }
 667
 668         if (status)
 669                 goto out;
 670
 671         if (create->cr_label.len)
 672                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 673
 674         if (create->cr_acl != NULL)
 675                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 676                                 create->cr_bmval);
 677
 678         fh_unlock(&cstate->current_fh);
 679         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 680         fh_dup2(&cstate->current_fh, &resfh);
 681 out:
 682         fh_put(&resfh);
 683         return status;
 684 }
 685
 686 static __be32
 687 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 688               struct nfsd4_getattr *getattr)
 689 {
 690         __be32 status;
 691
 692         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 693         if (status)
 694                 return status;
 695
 696         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 697                 return nfserr_inval;
 698
 699         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 700         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 701         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 702
 703         getattr->ga_fhp = &cstate->current_fh;
 704         return nfs_ok;
 705 }
 706
 707 static __be32
 708 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 709            struct nfsd4_link *link)
 710 {
 711         __be32 status = nfserr_nofilehandle;
 712
 713         if (!cstate->save_fh.fh_dentry)
 714                 return status;
 715         status = nfsd_link(rqstp, &cstate->current_fh,
 716                            link->li_name, link->li_namelen, &cstate->save_fh);
 717         if (!status)
 718                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 719         return status;
 720 }
 721
 722 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 723 {
 724         struct svc_fh tmp_fh;
 725         __be32 ret;
 726
 727         fh_init(&tmp_fh, NFS4_FHSIZE);
 728         ret = exp_pseudoroot(rqstp, &tmp_fh);
 729         if (ret)
 730                 return ret;
 731         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 732                 fh_put(&tmp_fh);
 733                 return nfserr_noent;
 734         }
 735         fh_put(&tmp_fh);
 736         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 737 }
 738
 739 static __be32
 740 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 741               void *arg)
 742 {
 743         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 744 }
 745
 746 static __be32
 747 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 748              struct nfsd4_lookup *lookup)
 749 {
 750         return nfsd_lookup(rqstp, &cstate->current_fh,
 751                            lookup->lo_name, lookup->lo_len,
 752                            &cstate->current_fh);
 753 }
 754
 755 static __be32
 756 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 757            struct nfsd4_read *read)
 758 {
 759         __be32 status;
 760
 761         read->rd_filp = NULL;
 762         if (read->rd_offset >= OFFSET_MAX)
 763                 return nfserr_inval;
 764
 765         /*
 766          * If we do a zero copy read, then a client will see read data
 767          * that reflects the state of the file *after* performing the
 768          * following compound.
 769          *
 770          * To ensure proper ordering, we therefore turn off zero copy if
 771          * the client wants us to do more in this compound:
 772          */
 773         if (!nfsd4_last_compound_op(rqstp))
 774                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 775
 776         /* check stateid */
 777         status = nfs4_preprocess_stateid_op(rqstp, cstate, &read->rd_stateid,
 778                         RD_STATE, &read->rd_filp, &read->rd_tmp_file);
 779         if (status) {
 780                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 781                 goto out;
 782         }
 783         status = nfs_ok;
 784 out:
 785         read->rd_rqstp = rqstp;
 786         read->rd_fhp = &cstate->current_fh;
 787         return status;
 788 }
 789
 790 static __be32
 791 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 792               struct nfsd4_readdir *readdir)
 793 {
 794         u64 cookie = readdir->rd_cookie;
 795         static const nfs4_verifier zeroverf;
 796
 797         /* no need to check permission - this will be done in nfsd_readdir() */
 798
 799         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 800                 return nfserr_inval;
 801
 802         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 803         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 804         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 805
 806         if ((cookie == 1) || (cookie == 2) ||
 807             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 808                 return nfserr_bad_cookie;
 809
 810         readdir->rd_rqstp = rqstp;
 811         readdir->rd_fhp = &cstate->current_fh;
 812         return nfs_ok;
 813 }
 814
 815 static __be32
 816 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 817                struct nfsd4_readlink *readlink)
 818 {
 819         readlink->rl_rqstp = rqstp;
 820         readlink->rl_fhp = &cstate->current_fh;
 821         return nfs_ok;
 822 }
 823
 824 static __be32
 825 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 826              struct nfsd4_remove *remove)
 827 {
 828         __be32 status;
 829
 830         if (opens_in_grace(SVC_NET(rqstp)))
 831                 return nfserr_grace;
 832         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 833                              remove->rm_name, remove->rm_namelen);
 834         if (!status) {
 835                 fh_unlock(&cstate->current_fh);
 836                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 837         }
 838         return status;
 839 }
 840
 841 static __be32
 842 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 843              struct nfsd4_rename *rename)
 844 {
 845         __be32 status = nfserr_nofilehandle;
 846
 847         if (!cstate->save_fh.fh_dentry)
 848                 return status;
 849         if (opens_in_grace(SVC_NET(rqstp)) &&
 850                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 851                 return nfserr_grace;
 852         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 853                              rename->rn_snamelen, &cstate->current_fh,
 854                              rename->rn_tname, rename->rn_tnamelen);
 855         if (status)
 856                 return status;
 857         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 858         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 859         return nfs_ok;
 860 }
 861
 862 static __be32
 863 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 864               struct nfsd4_secinfo *secinfo)
 865 {
 866         struct svc_fh resfh;
 867         struct svc_export *exp;
 868         struct dentry *dentry;
 869         __be32 err;
 870
 871         fh_init(&resfh, NFS4_FHSIZE);
 872         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 873         if (err)
 874                 return err;
 875         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 876                                     secinfo->si_name, secinfo->si_namelen,
 877                                     &exp, &dentry);
 878         if (err)
 879                 return err;
 880         if (d_really_is_negative(dentry)) {
 881                 exp_put(exp);
 882                 err = nfserr_noent;
 883         } else
 884                 secinfo->si_exp = exp;
 885         dput(dentry);
 886         if (cstate->minorversion)
 887                 /* See rfc 5661 section 2.6.3.1.1.8 */
 888                 fh_put(&cstate->current_fh);
 889         return err;
 890 }
 891
 892 static __be32
 893 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 894               struct nfsd4_secinfo_no_name *sin)
 895 {
 896         __be32 err;
 897
 898         switch (sin->sin_style) {
 899         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 900                 break;
 901         case NFS4_SECINFO_STYLE4_PARENT:
 902                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 903                 if (err)
 904                         return err;
 905                 break;
 906         default:
 907                 return nfserr_inval;
 908         }
 909
 910         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 911         fh_put(&cstate->current_fh);
 912         return nfs_ok;
 913 }
 914
 915 static __be32
 916 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 917               struct nfsd4_setattr *setattr)
 918 {
 919         __be32 status = nfs_ok;
 920         int err;
 921
 922         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 923                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 924                         &setattr->sa_stateid, WR_STATE, NULL, NULL);
 925                 if (status) {
 926                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 927                         return status;
 928                 }
 929         }
 930         err = fh_want_write(&cstate->current_fh);
 931         if (err)
 932                 return nfserrno(err);
 933         status = nfs_ok;
 934
 935         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 936                                     nfsd_attrmask);
 937         if (status)
 938                 goto out;
 939
 940         if (setattr->sa_acl != NULL)
 941                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 942                                             setattr->sa_acl);
 943         if (status)
 944                 goto out;
 945         if (setattr->sa_label.len)
 946                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 947                                 &setattr->sa_label);
 948         if (status)
 949                 goto out;
 950         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 951                                 0, (time_t)0);
 952 out:
 953         fh_drop_write(&cstate->current_fh);
 954         return status;
 955 }
 956
 957 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 958 {
 959         int i = 1;
 960         int buflen = write->wr_buflen;
 961
 962         vec[0].iov_base = write->wr_head.iov_base;
 963         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 964         buflen -= vec[0].iov_len;
 965
 966         while (buflen) {
 967                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 968                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 969                 buflen -= vec[i].iov_len;
 970                 i++;
 971         }
 972         return i;
 973 }
 974
 975 static __be32
 976 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 977             struct nfsd4_write *write)
 978 {
 979         stateid_t *stateid = &write->wr_stateid;
 980         struct file *filp = NULL;
 981         __be32 status = nfs_ok;
 982         unsigned long cnt;
 983         int nvecs;
 984
 985         if (write->wr_offset >= OFFSET_MAX)
 986                 return nfserr_inval;
 987
 988         status = nfs4_preprocess_stateid_op(rqstp, cstate, stateid, WR_STATE,
 989                         &filp, NULL);
 990         if (status) {
 991                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 992                 return status;
 993         }
 994
 995         cnt = write->wr_buflen;
 996         write->wr_how_written = write->wr_stable_how;
 997         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 998
 999         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1000         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1001
1002         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1003                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1004                                 &write->wr_how_written);
1005         fput(filp);
1006
1007         write->wr_bytes_written = cnt;
1008
1009         return status;
1010 }
1011
1012 static __be32
1013 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1014                 struct nfsd4_fallocate *fallocate, int flags)
1015 {
1016         __be32 status = nfserr_notsupp;
1017         struct file *file;
1018
1019         status = nfs4_preprocess_stateid_op(rqstp, cstate,
1020                                             &fallocate->falloc_stateid,
1021                                             WR_STATE, &file, NULL);
1022         if (status != nfs_ok) {
1023                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1024                 return status;
1025         }
1026
1027         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1028                                      fallocate->falloc_offset,
1029                                      fallocate->falloc_length,
1030                                      flags);
1031         fput(file);
1032         return status;
1033 }
1034
1035 static __be32
1036 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1037                struct nfsd4_fallocate *fallocate)
1038 {
1039         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1040 }
1041
1042 static __be32
1043 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1044                  struct nfsd4_fallocate *fallocate)
1045 {
1046         return nfsd4_fallocate(rqstp, cstate, fallocate,
1047                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1048 }
1049
1050 static __be32
1051 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1052                 struct nfsd4_seek *seek)
1053 {
1054         int whence;
1055         __be32 status;
1056         struct file *file;
1057
1058         status = nfs4_preprocess_stateid_op(rqstp, cstate,
1059                                             &seek->seek_stateid,
1060                                             RD_STATE, &file, NULL);
1061         if (status) {
1062                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1063                 return status;
1064         }
1065
1066         switch (seek->seek_whence) {
1067         case NFS4_CONTENT_DATA:
1068                 whence = SEEK_DATA;
1069                 break;
1070         case NFS4_CONTENT_HOLE:
1071                 whence = SEEK_HOLE;
1072                 break;
1073         default:
1074                 status = nfserr_union_notsupp;
1075                 goto out;
1076         }
1077
1078         /*
1079          * Note:  This call does change file->f_pos, but nothing in NFSD
1080          *        should ever file->f_pos.
1081          */
1082         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1083         if (seek->seek_pos < 0)
1084                 status = nfserrno(seek->seek_pos);
1085         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1086                 seek->seek_eof = true;
1087
1088 out:
1089         fput(file);
1090         return status;
1091 }
1092
1093 /* This routine never returns NFS_OK!  If there are no other errors, it
1094  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1095  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1096  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1097  */
1098 static __be32
1099 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1100              struct nfsd4_verify *verify)
1101 {
1102         __be32 *buf, *p;
1103         int count;
1104         __be32 status;
1105
1106         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1107         if (status)
1108                 return status;
1109
1110         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1111         if (status)
1112                 return status;
1113
1114         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1115             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1116                 return nfserr_inval;
1117         if (verify->ve_attrlen & 3)
1118                 return nfserr_inval;
1119
1120         /* count in words:
1121          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1122          */
1123         count = 4 + (verify->ve_attrlen >> 2);
1124         buf = kmalloc(count << 2, GFP_KERNEL);
1125         if (!buf)
1126                 return nfserr_jukebox;
1127
1128         p = buf;
1129         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1130                                     cstate->current_fh.fh_export,
1131                                     cstate->current_fh.fh_dentry,
1132                                     verify->ve_bmval,
1133                                     rqstp, 0);
1134         /*
1135          * If nfsd4_encode_fattr() ran out of space, assume that's because
1136          * the attributes are longer (hence different) than those given:
1137          */
1138         if (status == nfserr_resource)
1139                 status = nfserr_not_same;
1140         if (status)
1141                 goto out_kfree;
1142
1143         /* skip bitmap */
1144         p = buf + 1 + ntohl(buf[0]);
1145         status = nfserr_not_same;
1146         if (ntohl(*p++) != verify->ve_attrlen)
1147                 goto out_kfree;
1148         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1149                 status = nfserr_same;
1150
1151 out_kfree:
1152         kfree(buf);
1153         return status;
1154 }
1155
1156 static __be32
1157 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1158               struct nfsd4_verify *verify)
1159 {
1160         __be32 status;
1161
1162         status = _nfsd4_verify(rqstp, cstate, verify);
1163         return status == nfserr_not_same ? nfs_ok : status;
1164 }
1165
1166 static __be32
1167 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1168              struct nfsd4_verify *verify)
1169 {
1170         __be32 status;
1171
1172         status = _nfsd4_verify(rqstp, cstate, verify);
1173         return status == nfserr_same ? nfs_ok : status;
1174 }
1175
1176 #ifdef CONFIG_NFSD_PNFS
1177 static const struct nfsd4_layout_ops *
1178 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1179 {
1180         if (!exp->ex_layout_type) {
1181                 dprintk("%s: export does not support pNFS\n", __func__);
1182                 return NULL;
1183         }
1184
1185         if (exp->ex_layout_type != layout_type) {
1186                 dprintk("%s: layout type %d not supported\n",
1187                         __func__, layout_type);
1188                 return NULL;
1189         }
1190
1191         return nfsd4_layout_ops[layout_type];
1192 }
1193
1194 static __be32
1195 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1196                 struct nfsd4_compound_state *cstate,
1197                 struct nfsd4_getdeviceinfo *gdp)
1198 {
1199         const struct nfsd4_layout_ops *ops;
1200         struct nfsd4_deviceid_map *map;
1201         struct svc_export *exp;
1202         __be32 nfserr;
1203
1204         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1205                __func__,
1206                gdp->gd_layout_type,
1207                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1208                gdp->gd_maxcount);
1209
1210         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1211         if (!map) {
1212                 dprintk("%s: couldn't find device ID to export mapping!\n",
1213                         __func__);
1214                 return nfserr_noent;
1215         }
1216
1217         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1218         if (IS_ERR(exp)) {
1219                 dprintk("%s: could not find device id\n", __func__);
1220                 return nfserr_noent;
1221         }
1222
1223         nfserr = nfserr_layoutunavailable;
1224         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1225         if (!ops)
1226                 goto out;
1227
1228         nfserr = nfs_ok;
1229         if (gdp->gd_maxcount != 0)
1230                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb, gdp);
1231
1232         gdp->gd_notify_types &= ops->notify_types;
1233 out:
1234         exp_put(exp);
1235         return nfserr;
1236 }
1237
1238 static __be32
1239 nfsd4_layoutget(struct svc_rqst *rqstp,
1240                 struct nfsd4_compound_state *cstate,
1241                 struct nfsd4_layoutget *lgp)
1242 {
1243         struct svc_fh *current_fh = &cstate->current_fh;
1244         const struct nfsd4_layout_ops *ops;
1245         struct nfs4_layout_stateid *ls;
1246         __be32 nfserr;
1247         int accmode;
1248
1249         switch (lgp->lg_seg.iomode) {
1250         case IOMODE_READ:
1251                 accmode = NFSD_MAY_READ;
1252                 break;
1253         case IOMODE_RW:
1254                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1255                 break;
1256         default:
1257                 dprintk("%s: invalid iomode %d\n",
1258                         __func__, lgp->lg_seg.iomode);
1259                 nfserr = nfserr_badiomode;
1260                 goto out;
1261         }
1262
1263         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1264         if (nfserr)
1265                 goto out;
1266
1267         nfserr = nfserr_layoutunavailable;
1268         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1269         if (!ops)
1270                 goto out;
1271
1272         /*
1273          * Verify minlength and range as per RFC5661:
1274          *  o  If loga_length is less than loga_minlength,
1275          *     the metadata server MUST return NFS4ERR_INVAL.
1276          *  o  If the sum of loga_offset and loga_minlength exceeds
1277          *     NFS4_UINT64_MAX, and loga_minlength is not
1278          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1279          *  o  If the sum of loga_offset and loga_length exceeds
1280          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1281          *     the error NFS4ERR_INVAL MUST result.
1282          */
1283         nfserr = nfserr_inval;
1284         if (lgp->lg_seg.length < lgp->lg_minlength ||
1285             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1286              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1287             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1288              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1289                 goto out;
1290         if (lgp->lg_seg.length == 0)
1291                 goto out;
1292
1293         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1294                                                 true, lgp->lg_layout_type, &ls);
1295         if (nfserr) {
1296                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1297                 goto out;
1298         }
1299
1300         nfserr = nfserr_recallconflict;
1301         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1302                 goto out_put_stid;
1303
1304         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1305                                      current_fh, lgp);
1306         if (nfserr)
1307                 goto out_put_stid;
1308
1309         nfserr = nfsd4_insert_layout(lgp, ls);
1310
1311 out_put_stid:
1312         mutex_unlock(&ls->ls_mutex);
1313         nfs4_put_stid(&ls->ls_stid);
1314 out:
1315         return nfserr;
1316 }
1317
1318 static __be32
1319 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1320                 struct nfsd4_compound_state *cstate,
1321                 struct nfsd4_layoutcommit *lcp)
1322 {
1323         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1324         struct svc_fh *current_fh = &cstate->current_fh;
1325         const struct nfsd4_layout_ops *ops;
1326         loff_t new_size = lcp->lc_last_wr + 1;
1327         struct inode *inode;
1328         struct nfs4_layout_stateid *ls;
1329         __be32 nfserr;
1330
1331         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1332         if (nfserr)
1333                 goto out;
1334
1335         nfserr = nfserr_layoutunavailable;
1336         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1337         if (!ops)
1338                 goto out;
1339         inode = d_inode(current_fh->fh_dentry);
1340
1341         nfserr = nfserr_inval;
1342         if (new_size <= seg->offset) {
1343                 dprintk("pnfsd: last write before layout segment\n");
1344                 goto out;
1345         }
1346         if (new_size > seg->offset + seg->length) {
1347                 dprintk("pnfsd: last write beyond layout segment\n");
1348                 goto out;
1349         }
1350         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1351                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1352                 goto out;
1353         }
1354
1355         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1356                                                 false, lcp->lc_layout_type,
1357                                                 &ls);
1358         if (nfserr) {
1359                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1360                 /* fixup error code as per RFC5661 */
1361                 if (nfserr == nfserr_bad_stateid)
1362                         nfserr = nfserr_badlayout;
1363                 goto out;
1364         }
1365
1366         /* LAYOUTCOMMIT does not require any serialization */
1367         mutex_unlock(&ls->ls_mutex);
1368
1369         if (new_size > i_size_read(inode)) {
1370                 lcp->lc_size_chg = 1;
1371                 lcp->lc_newsize = new_size;
1372         } else {
1373                 lcp->lc_size_chg = 0;
1374         }
1375
1376         nfserr = ops->proc_layoutcommit(inode, lcp);
1377         nfs4_put_stid(&ls->ls_stid);
1378 out:
1379         return nfserr;
1380 }
1381
1382 static __be32
1383 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1384                 struct nfsd4_compound_state *cstate,
1385                 struct nfsd4_layoutreturn *lrp)
1386 {
1387         struct svc_fh *current_fh = &cstate->current_fh;
1388         __be32 nfserr;
1389
1390         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1391         if (nfserr)
1392                 goto out;
1393
1394         nfserr = nfserr_layoutunavailable;
1395         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1396                 goto out;
1397
1398         switch (lrp->lr_seg.iomode) {
1399         case IOMODE_READ:
1400         case IOMODE_RW:
1401         case IOMODE_ANY:
1402                 break;
1403         default:
1404                 dprintk("%s: invalid iomode %d\n", __func__,
1405                         lrp->lr_seg.iomode);
1406                 nfserr = nfserr_inval;
1407                 goto out;
1408         }
1409
1410         switch (lrp->lr_return_type) {
1411         case RETURN_FILE:
1412                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1413                 break;
1414         case RETURN_FSID:
1415         case RETURN_ALL:
1416                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1417                 break;
1418         default:
1419                 dprintk("%s: invalid return_type %d\n", __func__,
1420                         lrp->lr_return_type);
1421                 nfserr = nfserr_inval;
1422                 break;
1423         }
1424 out:
1425         return nfserr;
1426 }
1427 #endif /* CONFIG_NFSD_PNFS */
1428
1429 /*
1430  * NULL call.
1431  */
1432 static __be32
1433 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1434 {
1435         return nfs_ok;
1436 }
1437
1438 static inline void nfsd4_increment_op_stats(u32 opnum)
1439 {
1440         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1441                 nfsdstats.nfs4_opcount[opnum]++;
1442 }
1443
1444 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1445                               void *);
1446 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1447 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1448 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1449
1450 enum nfsd4_op_flags {
1451         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1452         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1453         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1454         /* For rfc 5661 section 2.6.3.1.1: */
1455         OP_HANDLES_WRONGSEC = 1 << 3,
1456         OP_IS_PUTFH_LIKE = 1 << 4,
1457         /*
1458          * These are the ops whose result size we estimate before
1459          * encoding, to avoid performing an op then not being able to
1460          * respond or cache a response.  This includes writes and setattrs
1461          * as well as the operations usually called "nonidempotent":
1462          */
1463         OP_MODIFIES_SOMETHING = 1 << 5,
1464         /*
1465          * Cache compounds containing these ops in the xid-based drc:
1466          * We use the DRC for compounds containing non-idempotent
1467          * operations, *except* those that are 4.1-specific (since
1468          * sessions provide their own EOS), and except for stateful
1469          * operations other than setclientid and setclientid_confirm
1470          * (since sequence numbers provide EOS for open, lock, etc in
1471          * the v4.0 case).
1472          */
1473         OP_CACHEME = 1 << 6,
1474         /*
1475          * These are ops which clear current state id.
1476          */
1477         OP_CLEAR_STATEID = 1 << 7,
1478 };
1479
1480 struct nfsd4_operation {
1481         nfsd4op_func op_func;
1482         u32 op_flags;
1483         char *op_name;
1484         /* Try to get response size before operation */
1485         nfsd4op_rsize op_rsize_bop;
1486         stateid_getter op_get_currentstateid;
1487         stateid_setter op_set_currentstateid;
1488 };
1489
1490 static struct nfsd4_operation nfsd4_ops[];
1491
1492 static const char *nfsd4_op_name(unsigned opnum);
1493
1494 /*
1495  * Enforce NFSv4.1 COMPOUND ordering rules:
1496  *
1497  * Also note, enforced elsewhere:
1498  *      - SEQUENCE other than as first op results in
1499  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1500  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1501  *        (Enforced in nfsd4_bind_conn_to_session().)
1502  *      - DESTROY_SESSION must be the final operation in a compound, if
1503  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1504  *        (Enforced in nfsd4_destroy_session().)
1505  */
1506 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1507 {
1508         struct nfsd4_op *op = &args->ops[0];
1509
1510         /* These ordering requirements don't apply to NFSv4.0: */
1511         if (args->minorversion == 0)
1512                 return nfs_ok;
1513         /* This is weird, but OK, not our problem: */
1514         if (args->opcnt == 0)
1515                 return nfs_ok;
1516         if (op->status == nfserr_op_illegal)
1517                 return nfs_ok;
1518         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1519                 return nfserr_op_not_in_session;
1520         if (op->opnum == OP_SEQUENCE)
1521                 return nfs_ok;
1522         if (args->opcnt != 1)
1523                 return nfserr_not_only_op;
1524         return nfs_ok;
1525 }
1526
1527 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1528 {
1529         return &nfsd4_ops[op->opnum];
1530 }
1531
1532 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1533 {
1534         if (op->opnum == OP_ILLEGAL)
1535                 return false;
1536         return OPDESC(op)->op_flags & OP_CACHEME;
1537 }
1538
1539 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1540 {
1541         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1542         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1543         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1544         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1545         struct nfsd4_operation *thisd;
1546         struct nfsd4_operation *nextd;
1547
1548         thisd = OPDESC(this);
1549         /*
1550          * Most ops check wronsec on our own; only the putfh-like ops
1551          * have special rules.
1552          */
1553         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1554                 return false;
1555         /*
1556          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1557          * put-filehandle operation if we're not going to use the
1558          * result:
1559          */
1560         if (argp->opcnt == resp->opcnt)
1561                 return false;
1562         if (next->opnum == OP_ILLEGAL)
1563                 return false;
1564         nextd = OPDESC(next);
1565         /*
1566          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1567          * errors themselves as necessary; others should check for them
1568          * now:
1569          */
1570         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1571 }
1572
1573 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1574                                struct nfsd4_compoundres *resp)
1575 {
1576         struct xdr_stream *xdr = &resp->xdr;
1577         struct xdr_buf *buf = &rqstp->rq_res;
1578         struct kvec *head = buf->head;
1579
1580         xdr->buf = buf;
1581         xdr->iov = head;
1582         xdr->p   = head->iov_base + head->iov_len;
1583         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1584         /* Tail and page_len should be zero at this point: */
1585         buf->len = buf->head[0].iov_len;
1586         xdr->scratch.iov_len = 0;
1587         xdr->page_ptr = buf->pages - 1;
1588         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1589                 - rqstp->rq_auth_slack;
1590 }
1591
1592 /*
1593  * COMPOUND call.
1594  */
1595 static __be32
1596 nfsd4_proc_compound(struct svc_rqst *rqstp,
1597                     struct nfsd4_compoundargs *args,
1598                     struct nfsd4_compoundres *resp)
1599 {
1600         struct nfsd4_op *op;
1601         struct nfsd4_operation *opdesc;
1602         struct nfsd4_compound_state *cstate = &resp->cstate;
1603         struct svc_fh *current_fh = &cstate->current_fh;
1604         struct svc_fh *save_fh = &cstate->save_fh;
1605         __be32          status;
1606
1607         svcxdr_init_encode(rqstp, resp);
1608         resp->tagp = resp->xdr.p;
1609         /* reserve space for: taglen, tag, and opcnt */
1610         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1611         resp->taglen = args->taglen;
1612         resp->tag = args->tag;
1613         resp->rqstp = rqstp;
1614         cstate->minorversion = args->minorversion;
1615         fh_init(current_fh, NFS4_FHSIZE);
1616         fh_init(save_fh, NFS4_FHSIZE);
1617         /*
1618          * Don't use the deferral mechanism for NFSv4; compounds make it
1619          * too hard to avoid non-idempotency problems.
1620          */
1621         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1622
1623         /*
1624          * According to RFC3010, this takes precedence over all other errors.
1625          */
1626         status = nfserr_minor_vers_mismatch;
1627         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1628                 goto out;
1629
1630         status = nfs41_check_op_ordering(args);
1631         if (status) {
1632                 op = &args->ops[0];
1633                 op->status = status;
1634                 goto encode_op;
1635         }
1636
1637         while (!status && resp->opcnt < args->opcnt) {
1638                 op = &args->ops[resp->opcnt++];
1639
1640                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1641                         resp->opcnt, args->opcnt, op->opnum,
1642                         nfsd4_op_name(op->opnum));
1643                 /*
1644                  * The XDR decode routines may have pre-set op->status;
1645                  * for example, if there is a miscellaneous XDR error
1646                  * it will be set to nfserr_bad_xdr.
1647                  */
1648                 if (op->status) {
1649                         if (op->opnum == OP_OPEN)
1650                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1651                         goto encode_op;
1652                 }
1653
1654                 opdesc = OPDESC(op);
1655
1656                 if (!current_fh->fh_dentry) {
1657                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1658                                 op->status = nfserr_nofilehandle;
1659                                 goto encode_op;
1660                         }
1661                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1662                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1663                         op->status = nfserr_moved;
1664                         goto encode_op;
1665                 }
1666
1667                 fh_clear_wcc(current_fh);
1668
1669                 /* If op is non-idempotent */
1670                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1671                         /*
1672                          * Don't execute this op if we couldn't encode a
1673                          * succesful reply:
1674                          */
1675                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1676                         /*
1677                          * Plus if there's another operation, make sure
1678                          * we'll have space to at least encode an error:
1679                          */
1680                         if (resp->opcnt < args->opcnt)
1681                                 plen += COMPOUND_ERR_SLACK_SPACE;
1682                         op->status = nfsd4_check_resp_size(resp, plen);
1683                 }
1684
1685                 if (op->status)
1686                         goto encode_op;
1687
1688                 if (opdesc->op_get_currentstateid)
1689                         opdesc->op_get_currentstateid(cstate, &op->u);
1690                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1691
1692                 if (!op->status) {
1693                         if (opdesc->op_set_currentstateid)
1694                                 opdesc->op_set_currentstateid(cstate, &op->u);
1695
1696                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1697                                 clear_current_stateid(cstate);
1698
1699                         if (need_wrongsec_check(rqstp))
1700                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1701                 }
1702
1703 encode_op:
1704                 /* Only from SEQUENCE */
1705                 if (cstate->status == nfserr_replay_cache) {
1706                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1707                         status = op->status;
1708                         goto out;
1709                 }
1710                 if (op->status == nfserr_replay_me) {
1711                         op->replay = &cstate->replay_owner->so_replay;
1712                         nfsd4_encode_replay(&resp->xdr, op);
1713                         status = op->status = op->replay->rp_status;
1714                 } else {
1715                         nfsd4_encode_operation(resp, op);
1716                         status = op->status;
1717                 }
1718
1719                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1720                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1721                         be32_to_cpu(status));
1722
1723                 nfsd4_cstate_clear_replay(cstate);
1724                 nfsd4_increment_op_stats(op->opnum);
1725         }
1726
1727         cstate->status = status;
1728         fh_put(current_fh);
1729         fh_put(save_fh);
1730         BUG_ON(cstate->replay_owner);
1731 out:
1732         /* Reset deferral mechanism for RPC deferrals */
1733         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1734         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1735         return status;
1736 }
1737
1738 #define op_encode_hdr_size              (2)
1739 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1740 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1741 #define op_encode_change_info_maxsz     (5)
1742 #define nfs4_fattr_bitmap_maxsz         (4)
1743
1744 /* We'll fall back on returning no lockowner if run out of space: */
1745 #define op_encode_lockowner_maxsz       (0)
1746 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1747
1748 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1749
1750 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1751 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1752                                          op_encode_ace_maxsz)
1753
1754 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1755
1756 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1757 {
1758         return (op_encode_hdr_size) * sizeof(__be32);
1759 }
1760
1761 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1762 {
1763         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1764 }
1765
1766 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1767 {
1768         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1769 }
1770
1771 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1772 {
1773         return (op_encode_hdr_size + op_encode_change_info_maxsz
1774                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1775 }
1776
1777 /*
1778  * Note since this is an idempotent operation we won't insist on failing
1779  * the op prematurely if the estimate is too large.  We may turn off splice
1780  * reads unnecessarily.
1781  */
1782 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1783                                       struct nfsd4_op *op)
1784 {
1785         u32 *bmap = op->u.getattr.ga_bmval;
1786         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1787         u32 ret = 0;
1788
1789         if (bmap0 & FATTR4_WORD0_ACL)
1790                 return svc_max_payload(rqstp);
1791         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1792                 return svc_max_payload(rqstp);
1793
1794         if (bmap1 & FATTR4_WORD1_OWNER) {
1795                 ret += IDMAP_NAMESZ + 4;
1796                 bmap1 &= ~FATTR4_WORD1_OWNER;
1797         }
1798         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1799                 ret += IDMAP_NAMESZ + 4;
1800                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1801         }
1802         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1803                 ret += NFS4_FHSIZE + 4;
1804                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1805         }
1806         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1807                 ret += NFS4_MAXLABELLEN + 12;
1808                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1809         }
1810         /*
1811          * Largest of remaining attributes are 16 bytes (e.g.,
1812          * supported_attributes)
1813          */
1814         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1815         /* bitmask, length */
1816         ret += 20;
1817         return ret;
1818 }
1819
1820 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1821 {
1822         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1823                 * sizeof(__be32);
1824 }
1825
1826 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1827 {
1828         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1829                 * sizeof(__be32);
1830 }
1831
1832 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1833 {
1834         return (op_encode_hdr_size + op_encode_stateid_maxsz
1835                 + op_encode_change_info_maxsz + 1
1836                 + nfs4_fattr_bitmap_maxsz
1837                 + op_encode_delegation_maxsz) * sizeof(__be32);
1838 }
1839
1840 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1841 {
1842         u32 maxcount = 0, rlen = 0;
1843
1844         maxcount = svc_max_payload(rqstp);
1845         rlen = min(op->u.read.rd_length, maxcount);
1846
1847         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1848 }
1849
1850 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1851 {
1852         u32 maxcount = 0, rlen = 0;
1853
1854         maxcount = svc_max_payload(rqstp);
1855         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1856
1857         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1858                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1859 }
1860
1861 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1862 {
1863         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1864                 * sizeof(__be32);
1865 }
1866
1867 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1868 {
1869         return (op_encode_hdr_size + op_encode_change_info_maxsz
1870                 + op_encode_change_info_maxsz) * sizeof(__be32);
1871 }
1872
1873 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1874                                        struct nfsd4_op *op)
1875 {
1876         return (op_encode_hdr_size
1877                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1878 }
1879
1880 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1881 {
1882         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1883 }
1884
1885 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1886 {
1887         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1888                                                                 sizeof(__be32);
1889 }
1890
1891 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1892 {
1893         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1894 }
1895
1896 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1897 {
1898         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1899                 1 + 1 + /* eir_flags, spr_how */\
1900                 4 + /* spo_must_enforce & _allow with bitmap */\
1901                 2 + /*eir_server_owner.so_minor_id */\
1902                 /* eir_server_owner.so_major_id<> */\
1903                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1904                 /* eir_server_scope<> */\
1905                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1906                 1 + /* eir_server_impl_id array length */\
1907                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1908 }
1909
1910 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1911 {
1912         return (op_encode_hdr_size + \
1913                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1914                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1915 }
1916
1917 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1918 {
1919         return (op_encode_hdr_size + \
1920                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1921                 2 + /* csr_sequence, csr_flags */\
1922                 op_encode_channel_attrs_maxsz + \
1923                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1924 }
1925
1926 #ifdef CONFIG_NFSD_PNFS
1927 /*
1928  * At this stage we don't really know what layout driver will handle the request,
1929  * so we need to define an arbitrary upper bound here.
1930  */
1931 #define MAX_LAYOUT_SIZE         128
1932 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1933 {
1934         return (op_encode_hdr_size +
1935                 1 /* logr_return_on_close */ +
1936                 op_encode_stateid_maxsz +
1937                 1 /* nr of layouts */ +
1938                 MAX_LAYOUT_SIZE) * sizeof(__be32);
1939 }
1940
1941 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1942 {
1943         return (op_encode_hdr_size +
1944                 1 /* locr_newsize */ +
1945                 2 /* ns_size */) * sizeof(__be32);
1946 }
1947
1948 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1949 {
1950         return (op_encode_hdr_size +
1951                 1 /* lrs_stateid */ +
1952                 op_encode_stateid_maxsz) * sizeof(__be32);
1953 }
1954 #endif /* CONFIG_NFSD_PNFS */
1955
1956 static struct nfsd4_operation nfsd4_ops[] = {
1957         [OP_ACCESS] = {
1958                 .op_func = (nfsd4op_func)nfsd4_access,
1959                 .op_name = "OP_ACCESS",
1960         },
1961         [OP_CLOSE] = {
1962                 .op_func = (nfsd4op_func)nfsd4_close,
1963                 .op_flags = OP_MODIFIES_SOMETHING,
1964                 .op_name = "OP_CLOSE",
1965                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1966                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1967                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1968         },
1969         [OP_COMMIT] = {
1970                 .op_func = (nfsd4op_func)nfsd4_commit,
1971                 .op_flags = OP_MODIFIES_SOMETHING,
1972                 .op_name = "OP_COMMIT",
1973                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1974         },
1975         [OP_CREATE] = {
1976                 .op_func = (nfsd4op_func)nfsd4_create,
1977                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1978                 .op_name = "OP_CREATE",
1979                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1980         },
1981         [OP_DELEGRETURN] = {
1982                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1983                 .op_flags = OP_MODIFIES_SOMETHING,
1984                 .op_name = "OP_DELEGRETURN",
1985                 .op_rsize_bop = nfsd4_only_status_rsize,
1986                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1987         },
1988         [OP_GETATTR] = {
1989                 .op_func = (nfsd4op_func)nfsd4_getattr,
1990                 .op_flags = ALLOWED_ON_ABSENT_FS,
1991                 .op_rsize_bop = nfsd4_getattr_rsize,
1992                 .op_name = "OP_GETATTR",
1993         },
1994         [OP_GETFH] = {
1995                 .op_func = (nfsd4op_func)nfsd4_getfh,
1996                 .op_name = "OP_GETFH",
1997         },
1998         [OP_LINK] = {
1999                 .op_func = (nfsd4op_func)nfsd4_link,
2000                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2001                                 | OP_CACHEME,
2002                 .op_name = "OP_LINK",
2003                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2004         },
2005         [OP_LOCK] = {
2006                 .op_func = (nfsd4op_func)nfsd4_lock,
2007                 .op_flags = OP_MODIFIES_SOMETHING,
2008                 .op_name = "OP_LOCK",
2009                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2010                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2011         },
2012         [OP_LOCKT] = {
2013                 .op_func = (nfsd4op_func)nfsd4_lockt,
2014                 .op_name = "OP_LOCKT",
2015         },
2016         [OP_LOCKU] = {
2017                 .op_func = (nfsd4op_func)nfsd4_locku,
2018                 .op_flags = OP_MODIFIES_SOMETHING,
2019                 .op_name = "OP_LOCKU",
2020                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2021                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2022         },
2023         [OP_LOOKUP] = {
2024                 .op_func = (nfsd4op_func)nfsd4_lookup,
2025                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2026                 .op_name = "OP_LOOKUP",
2027         },
2028         [OP_LOOKUPP] = {
2029                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2030                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2031                 .op_name = "OP_LOOKUPP",
2032         },
2033         [OP_NVERIFY] = {
2034                 .op_func = (nfsd4op_func)nfsd4_nverify,
2035                 .op_name = "OP_NVERIFY",
2036         },
2037         [OP_OPEN] = {
2038                 .op_func = (nfsd4op_func)nfsd4_open,
2039                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2040                 .op_name = "OP_OPEN",
2041                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2042                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2043         },
2044         [OP_OPEN_CONFIRM] = {
2045                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2046                 .op_flags = OP_MODIFIES_SOMETHING,
2047                 .op_name = "OP_OPEN_CONFIRM",
2048                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2049         },
2050         [OP_OPEN_DOWNGRADE] = {
2051                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2052                 .op_flags = OP_MODIFIES_SOMETHING,
2053                 .op_name = "OP_OPEN_DOWNGRADE",
2054                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2055                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2056                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2057         },
2058         [OP_PUTFH] = {
2059                 .op_func = (nfsd4op_func)nfsd4_putfh,
2060                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2061                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2062                 .op_name = "OP_PUTFH",
2063                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2064         },
2065         [OP_PUTPUBFH] = {
2066                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2067                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2068                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2069                 .op_name = "OP_PUTPUBFH",
2070                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2071         },
2072         [OP_PUTROOTFH] = {
2073                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2074                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2075                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2076                 .op_name = "OP_PUTROOTFH",
2077                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2078         },
2079         [OP_READ] = {
2080                 .op_func = (nfsd4op_func)nfsd4_read,
2081                 .op_name = "OP_READ",
2082                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2083                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2084         },
2085         [OP_READDIR] = {
2086                 .op_func = (nfsd4op_func)nfsd4_readdir,
2087                 .op_name = "OP_READDIR",
2088                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2089         },
2090         [OP_READLINK] = {
2091                 .op_func = (nfsd4op_func)nfsd4_readlink,
2092                 .op_name = "OP_READLINK",
2093         },
2094         [OP_REMOVE] = {
2095                 .op_func = (nfsd4op_func)nfsd4_remove,
2096                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2097                 .op_name = "OP_REMOVE",
2098                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2099         },
2100         [OP_RENAME] = {
2101                 .op_func = (nfsd4op_func)nfsd4_rename,
2102                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2103                 .op_name = "OP_RENAME",
2104                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2105         },
2106         [OP_RENEW] = {
2107                 .op_func = (nfsd4op_func)nfsd4_renew,
2108                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2109                                 | OP_MODIFIES_SOMETHING,
2110                 .op_name = "OP_RENEW",
2111                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2112
2113         },
2114         [OP_RESTOREFH] = {
2115                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2116                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2117                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2118                 .op_name = "OP_RESTOREFH",
2119                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2120         },
2121         [OP_SAVEFH] = {
2122                 .op_func = (nfsd4op_func)nfsd4_savefh,
2123                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2124                 .op_name = "OP_SAVEFH",
2125                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2126         },
2127         [OP_SECINFO] = {
2128                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2129                 .op_flags = OP_HANDLES_WRONGSEC,
2130                 .op_name = "OP_SECINFO",
2131         },
2132         [OP_SETATTR] = {
2133                 .op_func = (nfsd4op_func)nfsd4_setattr,
2134                 .op_name = "OP_SETATTR",
2135                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2136                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2137                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2138         },
2139         [OP_SETCLIENTID] = {
2140                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2141                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2142                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2143                 .op_name = "OP_SETCLIENTID",
2144                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2145         },
2146         [OP_SETCLIENTID_CONFIRM] = {
2147                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2148                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2149                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2150                 .op_name = "OP_SETCLIENTID_CONFIRM",
2151                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2152         },
2153         [OP_VERIFY] = {
2154                 .op_func = (nfsd4op_func)nfsd4_verify,
2155                 .op_name = "OP_VERIFY",
2156         },
2157         [OP_WRITE] = {
2158                 .op_func = (nfsd4op_func)nfsd4_write,
2159                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2160                 .op_name = "OP_WRITE",
2161                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2162                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2163         },
2164         [OP_RELEASE_LOCKOWNER] = {
2165                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2166                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2167                                 | OP_MODIFIES_SOMETHING,
2168                 .op_name = "OP_RELEASE_LOCKOWNER",
2169                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2170         },
2171
2172         /* NFSv4.1 operations */
2173         [OP_EXCHANGE_ID] = {
2174                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2175                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2176                                 | OP_MODIFIES_SOMETHING,
2177                 .op_name = "OP_EXCHANGE_ID",
2178                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2179         },
2180         [OP_BACKCHANNEL_CTL] = {
2181                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2182                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2183                 .op_name = "OP_BACKCHANNEL_CTL",
2184                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2185         },
2186         [OP_BIND_CONN_TO_SESSION] = {
2187                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2188                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2189                                 | OP_MODIFIES_SOMETHING,
2190                 .op_name = "OP_BIND_CONN_TO_SESSION",
2191                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2192         },
2193         [OP_CREATE_SESSION] = {
2194                 .op_func = (nfsd4op_func)nfsd4_create_session,
2195                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2196                                 | OP_MODIFIES_SOMETHING,
2197                 .op_name = "OP_CREATE_SESSION",
2198                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2199         },
2200         [OP_DESTROY_SESSION] = {
2201                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2202                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2203                                 | OP_MODIFIES_SOMETHING,
2204                 .op_name = "OP_DESTROY_SESSION",
2205                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2206         },
2207         [OP_SEQUENCE] = {
2208                 .op_func = (nfsd4op_func)nfsd4_sequence,
2209                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2210                 .op_name = "OP_SEQUENCE",
2211                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2212         },
2213         [OP_DESTROY_CLIENTID] = {
2214                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2215                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2216                                 | OP_MODIFIES_SOMETHING,
2217                 .op_name = "OP_DESTROY_CLIENTID",
2218                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2219         },
2220         [OP_RECLAIM_COMPLETE] = {
2221                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2222                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2223                 .op_name = "OP_RECLAIM_COMPLETE",
2224                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2225         },
2226         [OP_SECINFO_NO_NAME] = {
2227                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2228                 .op_flags = OP_HANDLES_WRONGSEC,
2229                 .op_name = "OP_SECINFO_NO_NAME",
2230         },
2231         [OP_TEST_STATEID] = {
2232                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2233                 .op_flags = ALLOWED_WITHOUT_FH,
2234                 .op_name = "OP_TEST_STATEID",
2235         },
2236         [OP_FREE_STATEID] = {
2237                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2238                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2239                 .op_name = "OP_FREE_STATEID",
2240                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2241                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2242         },
2243 #ifdef CONFIG_NFSD_PNFS
2244         [OP_GETDEVICEINFO] = {
2245                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2246                 .op_flags = ALLOWED_WITHOUT_FH,
2247                 .op_name = "OP_GETDEVICEINFO",
2248         },
2249         [OP_LAYOUTGET] = {
2250                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2251                 .op_flags = OP_MODIFIES_SOMETHING,
2252                 .op_name = "OP_LAYOUTGET",
2253                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2254         },
2255         [OP_LAYOUTCOMMIT] = {
2256                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2257                 .op_flags = OP_MODIFIES_SOMETHING,
2258                 .op_name = "OP_LAYOUTCOMMIT",
2259                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2260         },
2261         [OP_LAYOUTRETURN] = {
2262                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2263                 .op_flags = OP_MODIFIES_SOMETHING,
2264                 .op_name = "OP_LAYOUTRETURN",
2265                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2266         },
2267 #endif /* CONFIG_NFSD_PNFS */
2268
2269         /* NFSv4.2 operations */
2270         [OP_ALLOCATE] = {
2271                 .op_func = (nfsd4op_func)nfsd4_allocate,
2272                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2273                 .op_name = "OP_ALLOCATE",
2274                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2275         },
2276         [OP_DEALLOCATE] = {
2277                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2278                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2279                 .op_name = "OP_DEALLOCATE",
2280                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2281         },
2282         [OP_SEEK] = {
2283                 .op_func = (nfsd4op_func)nfsd4_seek,
2284                 .op_name = "OP_SEEK",
2285         },
2286 };
2287
2288 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2289 {
2290         struct nfsd4_operation *opdesc;
2291         nfsd4op_rsize estimator;
2292
2293         if (op->opnum == OP_ILLEGAL)
2294                 return op_encode_hdr_size * sizeof(__be32);
2295         opdesc = OPDESC(op);
2296         estimator = opdesc->op_rsize_bop;
2297         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2298 }
2299
2300 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2301 {
2302         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2303                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2304                         op->opnum, nfsd4_op_name(op->opnum));
2305                 WARN_ON_ONCE(1);
2306         }
2307 }
2308
2309 static const char *nfsd4_op_name(unsigned opnum)
2310 {
2311         if (opnum < ARRAY_SIZE(nfsd4_ops))
2312                 return nfsd4_ops[opnum].op_name;
2313         return "unknown_operation";
2314 }
2315
2316 #define nfsd4_voidres                   nfsd4_voidargs
2317 struct nfsd4_voidargs { int dummy; };
2318
2319 static struct svc_procedure             nfsd_procedures4[2] = {
2320         [NFSPROC4_NULL] = {
2321                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2322                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2323                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2324                 .pc_ressize = sizeof(struct nfsd4_voidres),
2325                 .pc_cachetype = RC_NOCACHE,
2326                 .pc_xdrressize = 1,
2327         },
2328         [NFSPROC4_COMPOUND] = {
2329                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2330                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2331                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2332                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2333                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2334                 .pc_release = nfsd4_release_compoundargs,
2335                 .pc_cachetype = RC_NOCACHE,
2336                 .pc_xdrressize = NFSD_BUFSIZE/4,
2337         },
2338 };
2339
2340 struct svc_version      nfsd_version4 = {
2341                 .vs_vers        = 4,
2342                 .vs_nproc       = 2,
2343                 .vs_proc        = nfsd_procedures4,
2344                 .vs_dispatch    = nfsd_dispatch,
2345                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2346                 .vs_rpcb_optnl  = 1,
2347 };
2348
2349 /*
2350  * Local variables:
2351  *  c-basic-offset: 8
2352  * End:
2353  */