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, use the returned bitmask
 280                  * to indicate which attributes we used to store the
 281                  * verifier:
 282                  */
 283                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && 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 nfsd4_compoundres *resp;
 366         struct net *net = SVC_NET(rqstp);
 367         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 368
 369         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 370                 (int)open->op_fname.len, open->op_fname.data,
 371                 open->op_openowner);
 372
 373         /* This check required by spec. */
 374         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 375                 return nfserr_inval;
 376
 377         open->op_created = 0;
 378         /*
 379          * RFC5661 18.51.3
 380          * Before RECLAIM_COMPLETE done, server should deny new lock
 381          */
 382         if (nfsd4_has_session(cstate) &&
 383             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 384                       &cstate->session->se_client->cl_flags) &&
 385             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 386                 return nfserr_grace;
 387
 388         if (nfsd4_has_session(cstate))
 389                 copy_clientid(&open->op_clientid, cstate->session);
 390
 391         /* check seqid for replay. set nfs4_owner */
 392         resp = rqstp->rq_resp;
 393         status = nfsd4_process_open1(&resp->cstate, open, nn);
 394         if (status == nfserr_replay_me) {
 395                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 396                 fh_put(&cstate->current_fh);
 397                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 398                                 &rp->rp_openfh);
 399                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 400                 if (status)
 401                         dprintk("nfsd4_open: replay failed"
 402                                 " restoring previous filehandle\n");
 403                 else
 404                         status = nfserr_replay_me;
 405         }
 406         if (status)
 407                 goto out;
 408         if (open->op_xdr_error) {
 409                 status = open->op_xdr_error;
 410                 goto out;
 411         }
 412
 413         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 414         if (status)
 415                 goto out;
 416
 417         /* Openowner is now set, so sequence id will get bumped.  Now we need
 418          * these checks before we do any creates: */
 419         status = nfserr_grace;
 420         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 421                 goto out;
 422         status = nfserr_no_grace;
 423         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 424                 goto out;
 425
 426         switch (open->op_claim_type) {
 427                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 428                 case NFS4_OPEN_CLAIM_NULL:
 429                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 430                         if (status)
 431                                 goto out;
 432                         break;
 433                 case NFS4_OPEN_CLAIM_PREVIOUS:
 434                         status = nfs4_check_open_reclaim(&open->op_clientid,
 435                                                          cstate, nn);
 436                         if (status)
 437                                 goto out;
 438                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 439                 case NFS4_OPEN_CLAIM_FH:
 440                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 441                         status = do_open_fhandle(rqstp, cstate, open);
 442                         if (status)
 443                                 goto out;
 444                         resfh = &cstate->current_fh;
 445                         break;
 446                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 447                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 448                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 449                                 open->op_claim_type);
 450                         status = nfserr_notsupp;
 451                         goto out;
 452                 default:
 453                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 454                                 open->op_claim_type);
 455                         status = nfserr_inval;
 456                         goto out;
 457         }
 458         /*
 459          * nfsd4_process_open2() does the actual opening of the file.  If
 460          * successful, it (1) truncates the file if open->op_truncate was
 461          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 462          */
 463         status = nfsd4_process_open2(rqstp, resfh, open);
 464         WARN(status && open->op_created,
 465              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 466              be32_to_cpu(status));
 467 out:
 468         if (resfh && resfh != &cstate->current_fh) {
 469                 fh_dup2(&cstate->current_fh, resfh);
 470                 fh_put(resfh);
 471                 kfree(resfh);
 472         }
 473         nfsd4_cleanup_open_state(cstate, open);
 474         nfsd4_bump_seqid(cstate, status);
 475         return status;
 476 }
 477
 478 /*
 479  * OPEN is the only seqid-mutating operation whose decoding can fail
 480  * with a seqid-mutating error (specifically, decoding of user names in
 481  * the attributes).  Therefore we have to do some processing to look up
 482  * the stateowner so that we can bump the seqid.
 483  */
 484 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 485 {
 486         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 487
 488         if (!seqid_mutating_err(ntohl(op->status)))
 489                 return op->status;
 490         if (nfsd4_has_session(cstate))
 491                 return op->status;
 492         open->op_xdr_error = op->status;
 493         return nfsd4_open(rqstp, cstate, open);
 494 }
 495
 496 /*
 497  * filehandle-manipulating ops.
 498  */
 499 static __be32
 500 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 501             struct svc_fh **getfh)
 502 {
 503         if (!cstate->current_fh.fh_dentry)
 504                 return nfserr_nofilehandle;
 505
 506         *getfh = &cstate->current_fh;
 507         return nfs_ok;
 508 }
 509
 510 static __be32
 511 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 512             struct nfsd4_putfh *putfh)
 513 {
 514         fh_put(&cstate->current_fh);
 515         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 516         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 517                putfh->pf_fhlen);
 518         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 519 }
 520
 521 static __be32
 522 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 523                 void *arg)
 524 {
 525         __be32 status;
 526
 527         fh_put(&cstate->current_fh);
 528         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 529         return status;
 530 }
 531
 532 static __be32
 533 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 534                 void *arg)
 535 {
 536         if (!cstate->save_fh.fh_dentry)
 537                 return nfserr_restorefh;
 538
 539         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 540         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 541                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 542                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 543         }
 544         return nfs_ok;
 545 }
 546
 547 static __be32
 548 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 549              void *arg)
 550 {
 551         if (!cstate->current_fh.fh_dentry)
 552                 return nfserr_nofilehandle;
 553
 554         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 555         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 556                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 557                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 558         }
 559         return nfs_ok;
 560 }
 561
 562 /*
 563  * misc nfsv4 ops
 564  */
 565 static __be32
 566 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 567              struct nfsd4_access *access)
 568 {
 569         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 570                 return nfserr_inval;
 571
 572         access->ac_resp_access = access->ac_req_access;
 573         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 574                            &access->ac_supported);
 575 }
 576
 577 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 578 {
 579         __be32 verf[2];
 580         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 581
 582         /*
 583          * This is opaque to client, so no need to byte-swap. Use
 584          * __force to keep sparse happy
 585          */
 586         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 587         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 588         memcpy(verifier->data, verf, sizeof(verifier->data));
 589 }
 590
 591 static __be32
 592 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593              struct nfsd4_commit *commit)
 594 {
 595         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 596         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 597                              commit->co_count);
 598 }
 599
 600 static __be32
 601 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 602              struct nfsd4_create *create)
 603 {
 604         struct svc_fh resfh;
 605         __be32 status;
 606         dev_t rdev;
 607
 608         fh_init(&resfh, NFS4_FHSIZE);
 609
 610         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 611                            NFSD_MAY_CREATE);
 612         if (status)
 613                 return status;
 614
 615         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 616                                     nfsd_attrmask);
 617         if (status)
 618                 return status;
 619
 620         switch (create->cr_type) {
 621         case NF4LNK:
 622                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 623                                       create->cr_name, create->cr_namelen,
 624                                       create->cr_data, &resfh);
 625                 break;
 626
 627         case NF4BLK:
 628                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 629                 if (MAJOR(rdev) != create->cr_specdata1 ||
 630                     MINOR(rdev) != create->cr_specdata2)
 631                         return nfserr_inval;
 632                 status = nfsd_create(rqstp, &cstate->current_fh,
 633                                      create->cr_name, create->cr_namelen,
 634                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 635                 break;
 636
 637         case NF4CHR:
 638                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 639                 if (MAJOR(rdev) != create->cr_specdata1 ||
 640                     MINOR(rdev) != create->cr_specdata2)
 641                         return nfserr_inval;
 642                 status = nfsd_create(rqstp, &cstate->current_fh,
 643                                      create->cr_name, create->cr_namelen,
 644                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 645                 break;
 646
 647         case NF4SOCK:
 648                 status = nfsd_create(rqstp, &cstate->current_fh,
 649                                      create->cr_name, create->cr_namelen,
 650                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 651                 break;
 652
 653         case NF4FIFO:
 654                 status = nfsd_create(rqstp, &cstate->current_fh,
 655                                      create->cr_name, create->cr_namelen,
 656                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 657                 break;
 658
 659         case NF4DIR:
 660                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 661                 status = nfsd_create(rqstp, &cstate->current_fh,
 662                                      create->cr_name, create->cr_namelen,
 663                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 664                 break;
 665
 666         default:
 667                 status = nfserr_badtype;
 668         }
 669
 670         if (status)
 671                 goto out;
 672
 673         if (create->cr_label.len)
 674                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 675
 676         if (create->cr_acl != NULL)
 677                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 678                                 create->cr_bmval);
 679
 680         fh_unlock(&cstate->current_fh);
 681         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 682         fh_dup2(&cstate->current_fh, &resfh);
 683 out:
 684         fh_put(&resfh);
 685         return status;
 686 }
 687
 688 static __be32
 689 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 690               struct nfsd4_getattr *getattr)
 691 {
 692         __be32 status;
 693
 694         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 695         if (status)
 696                 return status;
 697
 698         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 699                 return nfserr_inval;
 700
 701         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 702         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 703         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 704
 705         getattr->ga_fhp = &cstate->current_fh;
 706         return nfs_ok;
 707 }
 708
 709 static __be32
 710 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 711            struct nfsd4_link *link)
 712 {
 713         __be32 status = nfserr_nofilehandle;
 714
 715         if (!cstate->save_fh.fh_dentry)
 716                 return status;
 717         status = nfsd_link(rqstp, &cstate->current_fh,
 718                            link->li_name, link->li_namelen, &cstate->save_fh);
 719         if (!status)
 720                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 721         return status;
 722 }
 723
 724 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 725 {
 726         struct svc_fh tmp_fh;
 727         __be32 ret;
 728
 729         fh_init(&tmp_fh, NFS4_FHSIZE);
 730         ret = exp_pseudoroot(rqstp, &tmp_fh);
 731         if (ret)
 732                 return ret;
 733         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 734                 fh_put(&tmp_fh);
 735                 return nfserr_noent;
 736         }
 737         fh_put(&tmp_fh);
 738         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 739 }
 740
 741 static __be32
 742 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 743               void *arg)
 744 {
 745         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 746 }
 747
 748 static __be32
 749 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 750              struct nfsd4_lookup *lookup)
 751 {
 752         return nfsd_lookup(rqstp, &cstate->current_fh,
 753                            lookup->lo_name, lookup->lo_len,
 754                            &cstate->current_fh);
 755 }
 756
 757 static __be32
 758 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 759            struct nfsd4_read *read)
 760 {
 761         __be32 status;
 762
 763         read->rd_filp = NULL;
 764         if (read->rd_offset >= OFFSET_MAX)
 765                 return nfserr_inval;
 766
 767         /*
 768          * If we do a zero copy read, then a client will see read data
 769          * that reflects the state of the file *after* performing the
 770          * following compound.
 771          *
 772          * To ensure proper ordering, we therefore turn off zero copy if
 773          * the client wants us to do more in this compound:
 774          */
 775         if (!nfsd4_last_compound_op(rqstp))
 776                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 777
 778         /* check stateid */
 779         status = nfs4_preprocess_stateid_op(rqstp, cstate, &read->rd_stateid,
 780                         RD_STATE, &read->rd_filp, &read->rd_tmp_file);
 781         if (status) {
 782                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 783                 goto out;
 784         }
 785         status = nfs_ok;
 786 out:
 787         read->rd_rqstp = rqstp;
 788         read->rd_fhp = &cstate->current_fh;
 789         return status;
 790 }
 791
 792 static __be32
 793 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 794               struct nfsd4_readdir *readdir)
 795 {
 796         u64 cookie = readdir->rd_cookie;
 797         static const nfs4_verifier zeroverf;
 798
 799         /* no need to check permission - this will be done in nfsd_readdir() */
 800
 801         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 802                 return nfserr_inval;
 803
 804         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 805         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 806         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 807
 808         if ((cookie == 1) || (cookie == 2) ||
 809             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 810                 return nfserr_bad_cookie;
 811
 812         readdir->rd_rqstp = rqstp;
 813         readdir->rd_fhp = &cstate->current_fh;
 814         return nfs_ok;
 815 }
 816
 817 static __be32
 818 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 819                struct nfsd4_readlink *readlink)
 820 {
 821         readlink->rl_rqstp = rqstp;
 822         readlink->rl_fhp = &cstate->current_fh;
 823         return nfs_ok;
 824 }
 825
 826 static __be32
 827 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 828              struct nfsd4_remove *remove)
 829 {
 830         __be32 status;
 831
 832         if (locks_in_grace(SVC_NET(rqstp)))
 833                 return nfserr_grace;
 834         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 835                              remove->rm_name, remove->rm_namelen);
 836         if (!status) {
 837                 fh_unlock(&cstate->current_fh);
 838                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 839         }
 840         return status;
 841 }
 842
 843 static __be32
 844 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 845              struct nfsd4_rename *rename)
 846 {
 847         __be32 status = nfserr_nofilehandle;
 848
 849         if (!cstate->save_fh.fh_dentry)
 850                 return status;
 851         if (locks_in_grace(SVC_NET(rqstp)) &&
 852                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 853                 return nfserr_grace;
 854         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 855                              rename->rn_snamelen, &cstate->current_fh,
 856                              rename->rn_tname, rename->rn_tnamelen);
 857         if (status)
 858                 return status;
 859         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 860         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 861         return nfs_ok;
 862 }
 863
 864 static __be32
 865 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 866               struct nfsd4_secinfo *secinfo)
 867 {
 868         struct svc_fh resfh;
 869         struct svc_export *exp;
 870         struct dentry *dentry;
 871         __be32 err;
 872
 873         fh_init(&resfh, NFS4_FHSIZE);
 874         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 875         if (err)
 876                 return err;
 877         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 878                                     secinfo->si_name, secinfo->si_namelen,
 879                                     &exp, &dentry);
 880         if (err)
 881                 return err;
 882         if (d_really_is_negative(dentry)) {
 883                 exp_put(exp);
 884                 err = nfserr_noent;
 885         } else
 886                 secinfo->si_exp = exp;
 887         dput(dentry);
 888         if (cstate->minorversion)
 889                 /* See rfc 5661 section 2.6.3.1.1.8 */
 890                 fh_put(&cstate->current_fh);
 891         return err;
 892 }
 893
 894 static __be32
 895 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 896               struct nfsd4_secinfo_no_name *sin)
 897 {
 898         __be32 err;
 899
 900         switch (sin->sin_style) {
 901         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 902                 break;
 903         case NFS4_SECINFO_STYLE4_PARENT:
 904                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 905                 if (err)
 906                         return err;
 907                 break;
 908         default:
 909                 return nfserr_inval;
 910         }
 911
 912         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 913         fh_put(&cstate->current_fh);
 914         return nfs_ok;
 915 }
 916
 917 static __be32
 918 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 919               struct nfsd4_setattr *setattr)
 920 {
 921         __be32 status = nfs_ok;
 922         int err;
 923
 924         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 925                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 926                         &setattr->sa_stateid, WR_STATE, NULL, NULL);
 927                 if (status) {
 928                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 929                         return status;
 930                 }
 931         }
 932         err = fh_want_write(&cstate->current_fh);
 933         if (err)
 934                 return nfserrno(err);
 935         status = nfs_ok;
 936
 937         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 938                                     nfsd_attrmask);
 939         if (status)
 940                 goto out;
 941
 942         if (setattr->sa_acl != NULL)
 943                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 944                                             setattr->sa_acl);
 945         if (status)
 946                 goto out;
 947         if (setattr->sa_label.len)
 948                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 949                                 &setattr->sa_label);
 950         if (status)
 951                 goto out;
 952         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 953                                 0, (time_t)0);
 954 out:
 955         fh_drop_write(&cstate->current_fh);
 956         return status;
 957 }
 958
 959 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 960 {
 961         int i = 1;
 962         int buflen = write->wr_buflen;
 963
 964         vec[0].iov_base = write->wr_head.iov_base;
 965         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 966         buflen -= vec[0].iov_len;
 967
 968         while (buflen) {
 969                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 970                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 971                 buflen -= vec[i].iov_len;
 972                 i++;
 973         }
 974         return i;
 975 }
 976
 977 static __be32
 978 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 979             struct nfsd4_write *write)
 980 {
 981         stateid_t *stateid = &write->wr_stateid;
 982         struct file *filp = NULL;
 983         __be32 status = nfs_ok;
 984         unsigned long cnt;
 985         int nvecs;
 986
 987         if (write->wr_offset >= OFFSET_MAX)
 988                 return nfserr_inval;
 989
 990         status = nfs4_preprocess_stateid_op(rqstp, cstate, stateid, WR_STATE,
 991                         &filp, NULL);
 992         if (status) {
 993                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 994                 return status;
 995         }
 996
 997         cnt = write->wr_buflen;
 998         write->wr_how_written = write->wr_stable_how;
 999         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1000
1001         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1002         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1003
1004         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1005                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1006                                 &write->wr_how_written);
1007         fput(filp);
1008
1009         write->wr_bytes_written = cnt;
1010
1011         return status;
1012 }
1013
1014 static __be32
1015 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1016                 struct nfsd4_fallocate *fallocate, int flags)
1017 {
1018         __be32 status = nfserr_notsupp;
1019         struct file *file;
1020
1021         status = nfs4_preprocess_stateid_op(rqstp, cstate,
1022                                             &fallocate->falloc_stateid,
1023                                             WR_STATE, &file, NULL);
1024         if (status != nfs_ok) {
1025                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1026                 return status;
1027         }
1028
1029         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1030                                      fallocate->falloc_offset,
1031                                      fallocate->falloc_length,
1032                                      flags);
1033         fput(file);
1034         return status;
1035 }
1036
1037 static __be32
1038 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1039                struct nfsd4_fallocate *fallocate)
1040 {
1041         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1042 }
1043
1044 static __be32
1045 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1046                  struct nfsd4_fallocate *fallocate)
1047 {
1048         return nfsd4_fallocate(rqstp, cstate, fallocate,
1049                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1050 }
1051
1052 static __be32
1053 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1054                 struct nfsd4_seek *seek)
1055 {
1056         int whence;
1057         __be32 status;
1058         struct file *file;
1059
1060         status = nfs4_preprocess_stateid_op(rqstp, cstate,
1061                                             &seek->seek_stateid,
1062                                             RD_STATE, &file, NULL);
1063         if (status) {
1064                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1065                 return status;
1066         }
1067
1068         switch (seek->seek_whence) {
1069         case NFS4_CONTENT_DATA:
1070                 whence = SEEK_DATA;
1071                 break;
1072         case NFS4_CONTENT_HOLE:
1073                 whence = SEEK_HOLE;
1074                 break;
1075         default:
1076                 status = nfserr_union_notsupp;
1077                 goto out;
1078         }
1079
1080         /*
1081          * Note:  This call does change file->f_pos, but nothing in NFSD
1082          *        should ever file->f_pos.
1083          */
1084         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1085         if (seek->seek_pos < 0)
1086                 status = nfserrno(seek->seek_pos);
1087         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1088                 seek->seek_eof = true;
1089
1090 out:
1091         fput(file);
1092         return status;
1093 }
1094
1095 /* This routine never returns NFS_OK!  If there are no other errors, it
1096  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1097  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1098  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1099  */
1100 static __be32
1101 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1102              struct nfsd4_verify *verify)
1103 {
1104         __be32 *buf, *p;
1105         int count;
1106         __be32 status;
1107
1108         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1109         if (status)
1110                 return status;
1111
1112         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1113         if (status)
1114                 return status;
1115
1116         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1117             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1118                 return nfserr_inval;
1119         if (verify->ve_attrlen & 3)
1120                 return nfserr_inval;
1121
1122         /* count in words:
1123          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1124          */
1125         count = 4 + (verify->ve_attrlen >> 2);
1126         buf = kmalloc(count << 2, GFP_KERNEL);
1127         if (!buf)
1128                 return nfserr_jukebox;
1129
1130         p = buf;
1131         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1132                                     cstate->current_fh.fh_export,
1133                                     cstate->current_fh.fh_dentry,
1134                                     verify->ve_bmval,
1135                                     rqstp, 0);
1136         /*
1137          * If nfsd4_encode_fattr() ran out of space, assume that's because
1138          * the attributes are longer (hence different) than those given:
1139          */
1140         if (status == nfserr_resource)
1141                 status = nfserr_not_same;
1142         if (status)
1143                 goto out_kfree;
1144
1145         /* skip bitmap */
1146         p = buf + 1 + ntohl(buf[0]);
1147         status = nfserr_not_same;
1148         if (ntohl(*p++) != verify->ve_attrlen)
1149                 goto out_kfree;
1150         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1151                 status = nfserr_same;
1152
1153 out_kfree:
1154         kfree(buf);
1155         return status;
1156 }
1157
1158 static __be32
1159 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1160               struct nfsd4_verify *verify)
1161 {
1162         __be32 status;
1163
1164         status = _nfsd4_verify(rqstp, cstate, verify);
1165         return status == nfserr_not_same ? nfs_ok : status;
1166 }
1167
1168 static __be32
1169 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1170              struct nfsd4_verify *verify)
1171 {
1172         __be32 status;
1173
1174         status = _nfsd4_verify(rqstp, cstate, verify);
1175         return status == nfserr_same ? nfs_ok : status;
1176 }
1177
1178 #ifdef CONFIG_NFSD_PNFS
1179 static const struct nfsd4_layout_ops *
1180 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1181 {
1182         if (!exp->ex_layout_type) {
1183                 dprintk("%s: export does not support pNFS\n", __func__);
1184                 return NULL;
1185         }
1186
1187         if (exp->ex_layout_type != layout_type) {
1188                 dprintk("%s: layout type %d not supported\n",
1189                         __func__, layout_type);
1190                 return NULL;
1191         }
1192
1193         return nfsd4_layout_ops[layout_type];
1194 }
1195
1196 static __be32
1197 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1198                 struct nfsd4_compound_state *cstate,
1199                 struct nfsd4_getdeviceinfo *gdp)
1200 {
1201         const struct nfsd4_layout_ops *ops;
1202         struct nfsd4_deviceid_map *map;
1203         struct svc_export *exp;
1204         __be32 nfserr;
1205
1206         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1207                __func__,
1208                gdp->gd_layout_type,
1209                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1210                gdp->gd_maxcount);
1211
1212         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1213         if (!map) {
1214                 dprintk("%s: couldn't find device ID to export mapping!\n",
1215                         __func__);
1216                 return nfserr_noent;
1217         }
1218
1219         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1220         if (IS_ERR(exp)) {
1221                 dprintk("%s: could not find device id\n", __func__);
1222                 return nfserr_noent;
1223         }
1224
1225         nfserr = nfserr_layoutunavailable;
1226         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1227         if (!ops)
1228                 goto out;
1229
1230         nfserr = nfs_ok;
1231         if (gdp->gd_maxcount != 0)
1232                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb, gdp);
1233
1234         gdp->gd_notify_types &= ops->notify_types;
1235 out:
1236         exp_put(exp);
1237         return nfserr;
1238 }
1239
1240 static __be32
1241 nfsd4_layoutget(struct svc_rqst *rqstp,
1242                 struct nfsd4_compound_state *cstate,
1243                 struct nfsd4_layoutget *lgp)
1244 {
1245         struct svc_fh *current_fh = &cstate->current_fh;
1246         const struct nfsd4_layout_ops *ops;
1247         struct nfs4_layout_stateid *ls;
1248         __be32 nfserr;
1249         int accmode;
1250
1251         switch (lgp->lg_seg.iomode) {
1252         case IOMODE_READ:
1253                 accmode = NFSD_MAY_READ;
1254                 break;
1255         case IOMODE_RW:
1256                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1257                 break;
1258         default:
1259                 dprintk("%s: invalid iomode %d\n",
1260                         __func__, lgp->lg_seg.iomode);
1261                 nfserr = nfserr_badiomode;
1262                 goto out;
1263         }
1264
1265         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1266         if (nfserr)
1267                 goto out;
1268
1269         nfserr = nfserr_layoutunavailable;
1270         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1271         if (!ops)
1272                 goto out;
1273
1274         /*
1275          * Verify minlength and range as per RFC5661:
1276          *  o  If loga_length is less than loga_minlength,
1277          *     the metadata server MUST return NFS4ERR_INVAL.
1278          *  o  If the sum of loga_offset and loga_minlength exceeds
1279          *     NFS4_UINT64_MAX, and loga_minlength is not
1280          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1281          *  o  If the sum of loga_offset and loga_length exceeds
1282          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1283          *     the error NFS4ERR_INVAL MUST result.
1284          */
1285         nfserr = nfserr_inval;
1286         if (lgp->lg_seg.length < lgp->lg_minlength ||
1287             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1288              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1289             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1290              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1291                 goto out;
1292         if (lgp->lg_seg.length == 0)
1293                 goto out;
1294
1295         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1296                                                 true, lgp->lg_layout_type, &ls);
1297         if (nfserr) {
1298                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1299                 goto out;
1300         }
1301
1302         nfserr = nfserr_recallconflict;
1303         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1304                 goto out_put_stid;
1305
1306         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1307                                      current_fh, lgp);
1308         if (nfserr)
1309                 goto out_put_stid;
1310
1311         nfserr = nfsd4_insert_layout(lgp, ls);
1312
1313 out_put_stid:
1314         nfs4_put_stid(&ls->ls_stid);
1315 out:
1316         return nfserr;
1317 }
1318
1319 static __be32
1320 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1321                 struct nfsd4_compound_state *cstate,
1322                 struct nfsd4_layoutcommit *lcp)
1323 {
1324         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1325         struct svc_fh *current_fh = &cstate->current_fh;
1326         const struct nfsd4_layout_ops *ops;
1327         loff_t new_size = lcp->lc_last_wr + 1;
1328         struct inode *inode;
1329         struct nfs4_layout_stateid *ls;
1330         __be32 nfserr;
1331
1332         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1333         if (nfserr)
1334                 goto out;
1335
1336         nfserr = nfserr_layoutunavailable;
1337         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1338         if (!ops)
1339                 goto out;
1340         inode = d_inode(current_fh->fh_dentry);
1341
1342         nfserr = nfserr_inval;
1343         if (new_size <= seg->offset) {
1344                 dprintk("pnfsd: last write before layout segment\n");
1345                 goto out;
1346         }
1347         if (new_size > seg->offset + seg->length) {
1348                 dprintk("pnfsd: last write beyond layout segment\n");
1349                 goto out;
1350         }
1351         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1352                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1353                 goto out;
1354         }
1355
1356         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1357                                                 false, lcp->lc_layout_type,
1358                                                 &ls);
1359         if (nfserr) {
1360                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1361                 /* fixup error code as per RFC5661 */
1362                 if (nfserr == nfserr_bad_stateid)
1363                         nfserr = nfserr_badlayout;
1364                 goto out;
1365         }
1366
1367         nfserr = ops->proc_layoutcommit(inode, lcp);
1368         if (nfserr)
1369                 goto out_put_stid;
1370
1371         if (new_size > i_size_read(inode)) {
1372                 lcp->lc_size_chg = 1;
1373                 lcp->lc_newsize = new_size;
1374         } else {
1375                 lcp->lc_size_chg = 0;
1376         }
1377
1378 out_put_stid:
1379         nfs4_put_stid(&ls->ls_stid);
1380 out:
1381         return nfserr;
1382 }
1383
1384 static __be32
1385 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1386                 struct nfsd4_compound_state *cstate,
1387                 struct nfsd4_layoutreturn *lrp)
1388 {
1389         struct svc_fh *current_fh = &cstate->current_fh;
1390         __be32 nfserr;
1391
1392         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1393         if (nfserr)
1394                 goto out;
1395
1396         nfserr = nfserr_layoutunavailable;
1397         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1398                 goto out;
1399
1400         switch (lrp->lr_seg.iomode) {
1401         case IOMODE_READ:
1402         case IOMODE_RW:
1403         case IOMODE_ANY:
1404                 break;
1405         default:
1406                 dprintk("%s: invalid iomode %d\n", __func__,
1407                         lrp->lr_seg.iomode);
1408                 nfserr = nfserr_inval;
1409                 goto out;
1410         }
1411
1412         switch (lrp->lr_return_type) {
1413         case RETURN_FILE:
1414                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1415                 break;
1416         case RETURN_FSID:
1417         case RETURN_ALL:
1418                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1419                 break;
1420         default:
1421                 dprintk("%s: invalid return_type %d\n", __func__,
1422                         lrp->lr_return_type);
1423                 nfserr = nfserr_inval;
1424                 break;
1425         }
1426 out:
1427         return nfserr;
1428 }
1429 #endif /* CONFIG_NFSD_PNFS */
1430
1431 /*
1432  * NULL call.
1433  */
1434 static __be32
1435 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1436 {
1437         return nfs_ok;
1438 }
1439
1440 static inline void nfsd4_increment_op_stats(u32 opnum)
1441 {
1442         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1443                 nfsdstats.nfs4_opcount[opnum]++;
1444 }
1445
1446 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1447                               void *);
1448 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1449 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1450 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1451
1452 enum nfsd4_op_flags {
1453         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1454         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1455         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1456         /* For rfc 5661 section 2.6.3.1.1: */
1457         OP_HANDLES_WRONGSEC = 1 << 3,
1458         OP_IS_PUTFH_LIKE = 1 << 4,
1459         /*
1460          * These are the ops whose result size we estimate before
1461          * encoding, to avoid performing an op then not being able to
1462          * respond or cache a response.  This includes writes and setattrs
1463          * as well as the operations usually called "nonidempotent":
1464          */
1465         OP_MODIFIES_SOMETHING = 1 << 5,
1466         /*
1467          * Cache compounds containing these ops in the xid-based drc:
1468          * We use the DRC for compounds containing non-idempotent
1469          * operations, *except* those that are 4.1-specific (since
1470          * sessions provide their own EOS), and except for stateful
1471          * operations other than setclientid and setclientid_confirm
1472          * (since sequence numbers provide EOS for open, lock, etc in
1473          * the v4.0 case).
1474          */
1475         OP_CACHEME = 1 << 6,
1476         /*
1477          * These are ops which clear current state id.
1478          */
1479         OP_CLEAR_STATEID = 1 << 7,
1480 };
1481
1482 struct nfsd4_operation {
1483         nfsd4op_func op_func;
1484         u32 op_flags;
1485         char *op_name;
1486         /* Try to get response size before operation */
1487         nfsd4op_rsize op_rsize_bop;
1488         stateid_getter op_get_currentstateid;
1489         stateid_setter op_set_currentstateid;
1490 };
1491
1492 static struct nfsd4_operation nfsd4_ops[];
1493
1494 static const char *nfsd4_op_name(unsigned opnum);
1495
1496 /*
1497  * Enforce NFSv4.1 COMPOUND ordering rules:
1498  *
1499  * Also note, enforced elsewhere:
1500  *      - SEQUENCE other than as first op results in
1501  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1502  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1503  *        (Enforced in nfsd4_bind_conn_to_session().)
1504  *      - DESTROY_SESSION must be the final operation in a compound, if
1505  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1506  *        (Enforced in nfsd4_destroy_session().)
1507  */
1508 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1509 {
1510         struct nfsd4_op *op = &args->ops[0];
1511
1512         /* These ordering requirements don't apply to NFSv4.0: */
1513         if (args->minorversion == 0)
1514                 return nfs_ok;
1515         /* This is weird, but OK, not our problem: */
1516         if (args->opcnt == 0)
1517                 return nfs_ok;
1518         if (op->status == nfserr_op_illegal)
1519                 return nfs_ok;
1520         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1521                 return nfserr_op_not_in_session;
1522         if (op->opnum == OP_SEQUENCE)
1523                 return nfs_ok;
1524         if (args->opcnt != 1)
1525                 return nfserr_not_only_op;
1526         return nfs_ok;
1527 }
1528
1529 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1530 {
1531         return &nfsd4_ops[op->opnum];
1532 }
1533
1534 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1535 {
1536         if (op->opnum == OP_ILLEGAL)
1537                 return false;
1538         return OPDESC(op)->op_flags & OP_CACHEME;
1539 }
1540
1541 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1542 {
1543         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1544         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1545         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1546         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1547         struct nfsd4_operation *thisd;
1548         struct nfsd4_operation *nextd;
1549
1550         thisd = OPDESC(this);
1551         /*
1552          * Most ops check wronsec on our own; only the putfh-like ops
1553          * have special rules.
1554          */
1555         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1556                 return false;
1557         /*
1558          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1559          * put-filehandle operation if we're not going to use the
1560          * result:
1561          */
1562         if (argp->opcnt == resp->opcnt)
1563                 return false;
1564         if (next->opnum == OP_ILLEGAL)
1565                 return false;
1566         nextd = OPDESC(next);
1567         /*
1568          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1569          * errors themselves as necessary; others should check for them
1570          * now:
1571          */
1572         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1573 }
1574
1575 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1576                                struct nfsd4_compoundres *resp)
1577 {
1578         struct xdr_stream *xdr = &resp->xdr;
1579         struct xdr_buf *buf = &rqstp->rq_res;
1580         struct kvec *head = buf->head;
1581
1582         xdr->buf = buf;
1583         xdr->iov = head;
1584         xdr->p   = head->iov_base + head->iov_len;
1585         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1586         /* Tail and page_len should be zero at this point: */
1587         buf->len = buf->head[0].iov_len;
1588         xdr->scratch.iov_len = 0;
1589         xdr->page_ptr = buf->pages - 1;
1590         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1591                 - rqstp->rq_auth_slack;
1592 }
1593
1594 /*
1595  * COMPOUND call.
1596  */
1597 static __be32
1598 nfsd4_proc_compound(struct svc_rqst *rqstp,
1599                     struct nfsd4_compoundargs *args,
1600                     struct nfsd4_compoundres *resp)
1601 {
1602         struct nfsd4_op *op;
1603         struct nfsd4_operation *opdesc;
1604         struct nfsd4_compound_state *cstate = &resp->cstate;
1605         struct svc_fh *current_fh = &cstate->current_fh;
1606         struct svc_fh *save_fh = &cstate->save_fh;
1607         __be32          status;
1608
1609         svcxdr_init_encode(rqstp, resp);
1610         resp->tagp = resp->xdr.p;
1611         /* reserve space for: taglen, tag, and opcnt */
1612         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1613         resp->taglen = args->taglen;
1614         resp->tag = args->tag;
1615         resp->rqstp = rqstp;
1616         cstate->minorversion = args->minorversion;
1617         fh_init(current_fh, NFS4_FHSIZE);
1618         fh_init(save_fh, NFS4_FHSIZE);
1619         /*
1620          * Don't use the deferral mechanism for NFSv4; compounds make it
1621          * too hard to avoid non-idempotency problems.
1622          */
1623         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1624
1625         /*
1626          * According to RFC3010, this takes precedence over all other errors.
1627          */
1628         status = nfserr_minor_vers_mismatch;
1629         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1630                 goto out;
1631
1632         status = nfs41_check_op_ordering(args);
1633         if (status) {
1634                 op = &args->ops[0];
1635                 op->status = status;
1636                 goto encode_op;
1637         }
1638
1639         while (!status && resp->opcnt < args->opcnt) {
1640                 op = &args->ops[resp->opcnt++];
1641
1642                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1643                         resp->opcnt, args->opcnt, op->opnum,
1644                         nfsd4_op_name(op->opnum));
1645                 /*
1646                  * The XDR decode routines may have pre-set op->status;
1647                  * for example, if there is a miscellaneous XDR error
1648                  * it will be set to nfserr_bad_xdr.
1649                  */
1650                 if (op->status) {
1651                         if (op->opnum == OP_OPEN)
1652                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1653                         goto encode_op;
1654                 }
1655
1656                 opdesc = OPDESC(op);
1657
1658                 if (!current_fh->fh_dentry) {
1659                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1660                                 op->status = nfserr_nofilehandle;
1661                                 goto encode_op;
1662                         }
1663                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1664                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1665                         op->status = nfserr_moved;
1666                         goto encode_op;
1667                 }
1668
1669                 fh_clear_wcc(current_fh);
1670
1671                 /* If op is non-idempotent */
1672                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1673                         /*
1674                          * Don't execute this op if we couldn't encode a
1675                          * succesful reply:
1676                          */
1677                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1678                         /*
1679                          * Plus if there's another operation, make sure
1680                          * we'll have space to at least encode an error:
1681                          */
1682                         if (resp->opcnt < args->opcnt)
1683                                 plen += COMPOUND_ERR_SLACK_SPACE;
1684                         op->status = nfsd4_check_resp_size(resp, plen);
1685                 }
1686
1687                 if (op->status)
1688                         goto encode_op;
1689
1690                 if (opdesc->op_get_currentstateid)
1691                         opdesc->op_get_currentstateid(cstate, &op->u);
1692                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1693
1694                 if (!op->status) {
1695                         if (opdesc->op_set_currentstateid)
1696                                 opdesc->op_set_currentstateid(cstate, &op->u);
1697
1698                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1699                                 clear_current_stateid(cstate);
1700
1701                         if (need_wrongsec_check(rqstp))
1702                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1703                 }
1704
1705 encode_op:
1706                 /* Only from SEQUENCE */
1707                 if (cstate->status == nfserr_replay_cache) {
1708                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1709                         status = op->status;
1710                         goto out;
1711                 }
1712                 if (op->status == nfserr_replay_me) {
1713                         op->replay = &cstate->replay_owner->so_replay;
1714                         nfsd4_encode_replay(&resp->xdr, op);
1715                         status = op->status = op->replay->rp_status;
1716                 } else {
1717                         nfsd4_encode_operation(resp, op);
1718                         status = op->status;
1719                 }
1720
1721                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1722                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1723                         be32_to_cpu(status));
1724
1725                 nfsd4_cstate_clear_replay(cstate);
1726                 nfsd4_increment_op_stats(op->opnum);
1727         }
1728
1729         cstate->status = status;
1730         fh_put(current_fh);
1731         fh_put(save_fh);
1732         BUG_ON(cstate->replay_owner);
1733 out:
1734         /* Reset deferral mechanism for RPC deferrals */
1735         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1736         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1737         return status;
1738 }
1739
1740 #define op_encode_hdr_size              (2)
1741 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1742 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1743 #define op_encode_change_info_maxsz     (5)
1744 #define nfs4_fattr_bitmap_maxsz         (4)
1745
1746 /* We'll fall back on returning no lockowner if run out of space: */
1747 #define op_encode_lockowner_maxsz       (0)
1748 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1749
1750 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1751
1752 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1753 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1754                                          op_encode_ace_maxsz)
1755
1756 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1757
1758 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1759 {
1760         return (op_encode_hdr_size) * sizeof(__be32);
1761 }
1762
1763 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1764 {
1765         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1766 }
1767
1768 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1769 {
1770         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1771 }
1772
1773 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1774 {
1775         return (op_encode_hdr_size + op_encode_change_info_maxsz
1776                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1777 }
1778
1779 /*
1780  * Note since this is an idempotent operation we won't insist on failing
1781  * the op prematurely if the estimate is too large.  We may turn off splice
1782  * reads unnecessarily.
1783  */
1784 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1785                                       struct nfsd4_op *op)
1786 {
1787         u32 *bmap = op->u.getattr.ga_bmval;
1788         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1789         u32 ret = 0;
1790
1791         if (bmap0 & FATTR4_WORD0_ACL)
1792                 return svc_max_payload(rqstp);
1793         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1794                 return svc_max_payload(rqstp);
1795
1796         if (bmap1 & FATTR4_WORD1_OWNER) {
1797                 ret += IDMAP_NAMESZ + 4;
1798                 bmap1 &= ~FATTR4_WORD1_OWNER;
1799         }
1800         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1801                 ret += IDMAP_NAMESZ + 4;
1802                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1803         }
1804         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1805                 ret += NFS4_FHSIZE + 4;
1806                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1807         }
1808         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1809                 ret += NFS4_MAXLABELLEN + 12;
1810                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1811         }
1812         /*
1813          * Largest of remaining attributes are 16 bytes (e.g.,
1814          * supported_attributes)
1815          */
1816         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1817         /* bitmask, length */
1818         ret += 20;
1819         return ret;
1820 }
1821
1822 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1823 {
1824         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1825                 * sizeof(__be32);
1826 }
1827
1828 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1829 {
1830         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1831                 * sizeof(__be32);
1832 }
1833
1834 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1835 {
1836         return (op_encode_hdr_size + op_encode_stateid_maxsz
1837                 + op_encode_change_info_maxsz + 1
1838                 + nfs4_fattr_bitmap_maxsz
1839                 + op_encode_delegation_maxsz) * sizeof(__be32);
1840 }
1841
1842 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1843 {
1844         u32 maxcount = 0, rlen = 0;
1845
1846         maxcount = svc_max_payload(rqstp);
1847         rlen = min(op->u.read.rd_length, maxcount);
1848
1849         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1850 }
1851
1852 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1853 {
1854         u32 maxcount = 0, rlen = 0;
1855
1856         maxcount = svc_max_payload(rqstp);
1857         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1858
1859         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1860                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1861 }
1862
1863 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1864 {
1865         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1866                 * sizeof(__be32);
1867 }
1868
1869 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1870 {
1871         return (op_encode_hdr_size + op_encode_change_info_maxsz
1872                 + op_encode_change_info_maxsz) * sizeof(__be32);
1873 }
1874
1875 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1876                                        struct nfsd4_op *op)
1877 {
1878         return (op_encode_hdr_size
1879                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1880 }
1881
1882 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1883 {
1884         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1885 }
1886
1887 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1888 {
1889         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1890                                                                 sizeof(__be32);
1891 }
1892
1893 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1894 {
1895         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1896 }
1897
1898 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1899 {
1900         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1901                 1 + 1 + /* eir_flags, spr_how */\
1902                 4 + /* spo_must_enforce & _allow with bitmap */\
1903                 2 + /*eir_server_owner.so_minor_id */\
1904                 /* eir_server_owner.so_major_id<> */\
1905                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1906                 /* eir_server_scope<> */\
1907                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1908                 1 + /* eir_server_impl_id array length */\
1909                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1910 }
1911
1912 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1913 {
1914         return (op_encode_hdr_size + \
1915                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1916                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1917 }
1918
1919 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1920 {
1921         return (op_encode_hdr_size + \
1922                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1923                 2 + /* csr_sequence, csr_flags */\
1924                 op_encode_channel_attrs_maxsz + \
1925                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1926 }
1927
1928 #ifdef CONFIG_NFSD_PNFS
1929 /*
1930  * At this stage we don't really know what layout driver will handle the request,
1931  * so we need to define an arbitrary upper bound here.
1932  */
1933 #define MAX_LAYOUT_SIZE         128
1934 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1935 {
1936         return (op_encode_hdr_size +
1937                 1 /* logr_return_on_close */ +
1938                 op_encode_stateid_maxsz +
1939                 1 /* nr of layouts */ +
1940                 MAX_LAYOUT_SIZE) * sizeof(__be32);
1941 }
1942
1943 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1944 {
1945         return (op_encode_hdr_size +
1946                 1 /* locr_newsize */ +
1947                 2 /* ns_size */) * sizeof(__be32);
1948 }
1949
1950 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1951 {
1952         return (op_encode_hdr_size +
1953                 1 /* lrs_stateid */ +
1954                 op_encode_stateid_maxsz) * sizeof(__be32);
1955 }
1956 #endif /* CONFIG_NFSD_PNFS */
1957
1958 static struct nfsd4_operation nfsd4_ops[] = {
1959         [OP_ACCESS] = {
1960                 .op_func = (nfsd4op_func)nfsd4_access,
1961                 .op_name = "OP_ACCESS",
1962         },
1963         [OP_CLOSE] = {
1964                 .op_func = (nfsd4op_func)nfsd4_close,
1965                 .op_flags = OP_MODIFIES_SOMETHING,
1966                 .op_name = "OP_CLOSE",
1967                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1968                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1969                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1970         },
1971         [OP_COMMIT] = {
1972                 .op_func = (nfsd4op_func)nfsd4_commit,
1973                 .op_flags = OP_MODIFIES_SOMETHING,
1974                 .op_name = "OP_COMMIT",
1975                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1976         },
1977         [OP_CREATE] = {
1978                 .op_func = (nfsd4op_func)nfsd4_create,
1979                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1980                 .op_name = "OP_CREATE",
1981                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1982         },
1983         [OP_DELEGRETURN] = {
1984                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1985                 .op_flags = OP_MODIFIES_SOMETHING,
1986                 .op_name = "OP_DELEGRETURN",
1987                 .op_rsize_bop = nfsd4_only_status_rsize,
1988                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1989         },
1990         [OP_GETATTR] = {
1991                 .op_func = (nfsd4op_func)nfsd4_getattr,
1992                 .op_flags = ALLOWED_ON_ABSENT_FS,
1993                 .op_rsize_bop = nfsd4_getattr_rsize,
1994                 .op_name = "OP_GETATTR",
1995         },
1996         [OP_GETFH] = {
1997                 .op_func = (nfsd4op_func)nfsd4_getfh,
1998                 .op_name = "OP_GETFH",
1999         },
2000         [OP_LINK] = {
2001                 .op_func = (nfsd4op_func)nfsd4_link,
2002                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2003                                 | OP_CACHEME,
2004                 .op_name = "OP_LINK",
2005                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2006         },
2007         [OP_LOCK] = {
2008                 .op_func = (nfsd4op_func)nfsd4_lock,
2009                 .op_flags = OP_MODIFIES_SOMETHING,
2010                 .op_name = "OP_LOCK",
2011                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2012                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2013         },
2014         [OP_LOCKT] = {
2015                 .op_func = (nfsd4op_func)nfsd4_lockt,
2016                 .op_name = "OP_LOCKT",
2017         },
2018         [OP_LOCKU] = {
2019                 .op_func = (nfsd4op_func)nfsd4_locku,
2020                 .op_flags = OP_MODIFIES_SOMETHING,
2021                 .op_name = "OP_LOCKU",
2022                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2023                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2024         },
2025         [OP_LOOKUP] = {
2026                 .op_func = (nfsd4op_func)nfsd4_lookup,
2027                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2028                 .op_name = "OP_LOOKUP",
2029         },
2030         [OP_LOOKUPP] = {
2031                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2032                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2033                 .op_name = "OP_LOOKUPP",
2034         },
2035         [OP_NVERIFY] = {
2036                 .op_func = (nfsd4op_func)nfsd4_nverify,
2037                 .op_name = "OP_NVERIFY",
2038         },
2039         [OP_OPEN] = {
2040                 .op_func = (nfsd4op_func)nfsd4_open,
2041                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2042                 .op_name = "OP_OPEN",
2043                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2044                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2045         },
2046         [OP_OPEN_CONFIRM] = {
2047                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2048                 .op_flags = OP_MODIFIES_SOMETHING,
2049                 .op_name = "OP_OPEN_CONFIRM",
2050                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2051         },
2052         [OP_OPEN_DOWNGRADE] = {
2053                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2054                 .op_flags = OP_MODIFIES_SOMETHING,
2055                 .op_name = "OP_OPEN_DOWNGRADE",
2056                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2057                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2058                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2059         },
2060         [OP_PUTFH] = {
2061                 .op_func = (nfsd4op_func)nfsd4_putfh,
2062                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2063                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2064                 .op_name = "OP_PUTFH",
2065                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2066         },
2067         [OP_PUTPUBFH] = {
2068                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2069                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2070                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2071                 .op_name = "OP_PUTPUBFH",
2072                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2073         },
2074         [OP_PUTROOTFH] = {
2075                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2076                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2077                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2078                 .op_name = "OP_PUTROOTFH",
2079                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2080         },
2081         [OP_READ] = {
2082                 .op_func = (nfsd4op_func)nfsd4_read,
2083                 .op_name = "OP_READ",
2084                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2085                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2086         },
2087         [OP_READDIR] = {
2088                 .op_func = (nfsd4op_func)nfsd4_readdir,
2089                 .op_name = "OP_READDIR",
2090                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2091         },
2092         [OP_READLINK] = {
2093                 .op_func = (nfsd4op_func)nfsd4_readlink,
2094                 .op_name = "OP_READLINK",
2095         },
2096         [OP_REMOVE] = {
2097                 .op_func = (nfsd4op_func)nfsd4_remove,
2098                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2099                 .op_name = "OP_REMOVE",
2100                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2101         },
2102         [OP_RENAME] = {
2103                 .op_func = (nfsd4op_func)nfsd4_rename,
2104                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2105                 .op_name = "OP_RENAME",
2106                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2107         },
2108         [OP_RENEW] = {
2109                 .op_func = (nfsd4op_func)nfsd4_renew,
2110                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2111                                 | OP_MODIFIES_SOMETHING,
2112                 .op_name = "OP_RENEW",
2113                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2114
2115         },
2116         [OP_RESTOREFH] = {
2117                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2118                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2119                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2120                 .op_name = "OP_RESTOREFH",
2121                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2122         },
2123         [OP_SAVEFH] = {
2124                 .op_func = (nfsd4op_func)nfsd4_savefh,
2125                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2126                 .op_name = "OP_SAVEFH",
2127                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2128         },
2129         [OP_SECINFO] = {
2130                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2131                 .op_flags = OP_HANDLES_WRONGSEC,
2132                 .op_name = "OP_SECINFO",
2133         },
2134         [OP_SETATTR] = {
2135                 .op_func = (nfsd4op_func)nfsd4_setattr,
2136                 .op_name = "OP_SETATTR",
2137                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2138                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2139                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2140         },
2141         [OP_SETCLIENTID] = {
2142                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2143                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2144                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2145                 .op_name = "OP_SETCLIENTID",
2146                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2147         },
2148         [OP_SETCLIENTID_CONFIRM] = {
2149                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2150                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2151                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2152                 .op_name = "OP_SETCLIENTID_CONFIRM",
2153                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2154         },
2155         [OP_VERIFY] = {
2156                 .op_func = (nfsd4op_func)nfsd4_verify,
2157                 .op_name = "OP_VERIFY",
2158         },
2159         [OP_WRITE] = {
2160                 .op_func = (nfsd4op_func)nfsd4_write,
2161                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2162                 .op_name = "OP_WRITE",
2163                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2164                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2165         },
2166         [OP_RELEASE_LOCKOWNER] = {
2167                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2168                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2169                                 | OP_MODIFIES_SOMETHING,
2170                 .op_name = "OP_RELEASE_LOCKOWNER",
2171                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2172         },
2173
2174         /* NFSv4.1 operations */
2175         [OP_EXCHANGE_ID] = {
2176                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2177                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2178                                 | OP_MODIFIES_SOMETHING,
2179                 .op_name = "OP_EXCHANGE_ID",
2180                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2181         },
2182         [OP_BACKCHANNEL_CTL] = {
2183                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2184                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2185                 .op_name = "OP_BACKCHANNEL_CTL",
2186                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2187         },
2188         [OP_BIND_CONN_TO_SESSION] = {
2189                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2190                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2191                                 | OP_MODIFIES_SOMETHING,
2192                 .op_name = "OP_BIND_CONN_TO_SESSION",
2193                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2194         },
2195         [OP_CREATE_SESSION] = {
2196                 .op_func = (nfsd4op_func)nfsd4_create_session,
2197                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2198                                 | OP_MODIFIES_SOMETHING,
2199                 .op_name = "OP_CREATE_SESSION",
2200                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2201         },
2202         [OP_DESTROY_SESSION] = {
2203                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2204                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2205                                 | OP_MODIFIES_SOMETHING,
2206                 .op_name = "OP_DESTROY_SESSION",
2207                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2208         },
2209         [OP_SEQUENCE] = {
2210                 .op_func = (nfsd4op_func)nfsd4_sequence,
2211                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2212                 .op_name = "OP_SEQUENCE",
2213                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2214         },
2215         [OP_DESTROY_CLIENTID] = {
2216                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2217                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2218                                 | OP_MODIFIES_SOMETHING,
2219                 .op_name = "OP_DESTROY_CLIENTID",
2220                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2221         },
2222         [OP_RECLAIM_COMPLETE] = {
2223                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2224                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2225                 .op_name = "OP_RECLAIM_COMPLETE",
2226                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2227         },
2228         [OP_SECINFO_NO_NAME] = {
2229                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2230                 .op_flags = OP_HANDLES_WRONGSEC,
2231                 .op_name = "OP_SECINFO_NO_NAME",
2232         },
2233         [OP_TEST_STATEID] = {
2234                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2235                 .op_flags = ALLOWED_WITHOUT_FH,
2236                 .op_name = "OP_TEST_STATEID",
2237         },
2238         [OP_FREE_STATEID] = {
2239                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2240                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2241                 .op_name = "OP_FREE_STATEID",
2242                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2243                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2244         },
2245 #ifdef CONFIG_NFSD_PNFS
2246         [OP_GETDEVICEINFO] = {
2247                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2248                 .op_flags = ALLOWED_WITHOUT_FH,
2249                 .op_name = "OP_GETDEVICEINFO",
2250         },
2251         [OP_LAYOUTGET] = {
2252                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2253                 .op_flags = OP_MODIFIES_SOMETHING,
2254                 .op_name = "OP_LAYOUTGET",
2255                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2256         },
2257         [OP_LAYOUTCOMMIT] = {
2258                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2259                 .op_flags = OP_MODIFIES_SOMETHING,
2260                 .op_name = "OP_LAYOUTCOMMIT",
2261                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2262         },
2263         [OP_LAYOUTRETURN] = {
2264                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2265                 .op_flags = OP_MODIFIES_SOMETHING,
2266                 .op_name = "OP_LAYOUTRETURN",
2267                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2268         },
2269 #endif /* CONFIG_NFSD_PNFS */
2270
2271         /* NFSv4.2 operations */
2272         [OP_ALLOCATE] = {
2273                 .op_func = (nfsd4op_func)nfsd4_allocate,
2274                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2275                 .op_name = "OP_ALLOCATE",
2276                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2277         },
2278         [OP_DEALLOCATE] = {
2279                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2280                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2281                 .op_name = "OP_DEALLOCATE",
2282                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2283         },
2284         [OP_SEEK] = {
2285                 .op_func = (nfsd4op_func)nfsd4_seek,
2286                 .op_name = "OP_SEEK",
2287         },
2288 };
2289
2290 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2291 {
2292         struct nfsd4_operation *opdesc;
2293         nfsd4op_rsize estimator;
2294
2295         if (op->opnum == OP_ILLEGAL)
2296                 return op_encode_hdr_size * sizeof(__be32);
2297         opdesc = OPDESC(op);
2298         estimator = opdesc->op_rsize_bop;
2299         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2300 }
2301
2302 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2303 {
2304         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2305                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2306                         op->opnum, nfsd4_op_name(op->opnum));
2307                 WARN_ON_ONCE(1);
2308         }
2309 }
2310
2311 static const char *nfsd4_op_name(unsigned opnum)
2312 {
2313         if (opnum < ARRAY_SIZE(nfsd4_ops))
2314                 return nfsd4_ops[opnum].op_name;
2315         return "unknown_operation";
2316 }
2317
2318 #define nfsd4_voidres                   nfsd4_voidargs
2319 struct nfsd4_voidargs { int dummy; };
2320
2321 static struct svc_procedure             nfsd_procedures4[2] = {
2322         [NFSPROC4_NULL] = {
2323                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2324                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2325                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2326                 .pc_ressize = sizeof(struct nfsd4_voidres),
2327                 .pc_cachetype = RC_NOCACHE,
2328                 .pc_xdrressize = 1,
2329         },
2330         [NFSPROC4_COMPOUND] = {
2331                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2332                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2333                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2334                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2335                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2336                 .pc_release = nfsd4_release_compoundargs,
2337                 .pc_cachetype = RC_NOCACHE,
2338                 .pc_xdrressize = NFSD_BUFSIZE/4,
2339         },
2340 };
2341
2342 struct svc_version      nfsd_version4 = {
2343                 .vs_vers        = 4,
2344                 .vs_nproc       = 2,
2345                 .vs_proc        = nfsd_procedures4,
2346                 .vs_dispatch    = nfsd_dispatch,
2347                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2348                 .vs_rpcb_optnl  = 1,
2349 };
2350
2351 /*
2352  * Local variables:
2353  *  c-basic-offset: 8
2354  * End:
2355  */