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         inode_lock(inode);
  59         status = security_inode_setsecctx(resfh->fh_dentry,
  60                 label->data, label->len);
  61         inode_unlock(inode);
  62
  63         if (status)
  64                 /*
  65                  * XXX: We should really fail the whole open, but we may
  66                  * already have created a new file, so it may be too
  67                  * late.  For now this seems the least of evils:
  68                  */
  69                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
  70
  71         return;
  72 }
  73 #else
  74 static inline void
  75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
  76 { }
  77 #endif
  78
  79 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  80
  81 static u32 nfsd_attrmask[] = {
  82         NFSD_WRITEABLE_ATTRS_WORD0,
  83         NFSD_WRITEABLE_ATTRS_WORD1,
  84         NFSD_WRITEABLE_ATTRS_WORD2
  85 };
  86
  87 static u32 nfsd41_ex_attrmask[] = {
  88         NFSD_SUPPATTR_EXCLCREAT_WORD0,
  89         NFSD_SUPPATTR_EXCLCREAT_WORD1,
  90         NFSD_SUPPATTR_EXCLCREAT_WORD2
  91 };
  92
  93 static __be32
  94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
  95                    u32 *bmval, u32 *writable)
  96 {
  97         struct dentry *dentry = cstate->current_fh.fh_dentry;
  98
  99         /*
 100          * Check about attributes are supported by the NFSv4 server or not.
 101          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 102          */
 103         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
 104             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
 105             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
 106                 return nfserr_attrnotsupp;
 107
 108         /*
 109          * Check FATTR4_WORD0_ACL can be supported
 110          * in current environment or not.
 111          */
 112         if (bmval[0] & FATTR4_WORD0_ACL) {
 113                 if (!IS_POSIXACL(d_inode(dentry)))
 114                         return nfserr_attrnotsupp;
 115         }
 116
 117         /*
 118          * According to spec, read-only attributes return ERR_INVAL.
 119          */
 120         if (writable) {
 121                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
 122                     (bmval[2] & ~writable[2]))
 123                         return nfserr_inval;
 124         }
 125
 126         return nfs_ok;
 127 }
 128
 129 static __be32
 130 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 131         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 132 {
 133         __be32 status = nfs_ok;
 134
 135         if (open->op_create == NFS4_OPEN_CREATE) {
 136                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 137                     || open->op_createmode == NFS4_CREATE_GUARDED)
 138                         status = check_attr_support(rqstp, cstate,
 139                                         open->op_bmval, nfsd_attrmask);
 140                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 141                         status = check_attr_support(rqstp, cstate,
 142                                         open->op_bmval, nfsd41_ex_attrmask);
 143         }
 144
 145         return status;
 146 }
 147
 148 static int
 149 is_create_with_attrs(struct nfsd4_open *open)
 150 {
 151         return open->op_create == NFS4_OPEN_CREATE
 152                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 153                     || open->op_createmode == NFS4_CREATE_GUARDED
 154                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 155 }
 156
 157 /*
 158  * if error occurs when setting the acl, just clear the acl bit
 159  * in the returned attr bitmap.
 160  */
 161 static void
 162 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 163                 struct nfs4_acl *acl, u32 *bmval)
 164 {
 165         __be32 status;
 166
 167         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 168         if (status)
 169                 /*
 170                  * We should probably fail the whole open at this point,
 171                  * but we've already created the file, so it's too late;
 172                  * So this seems the least of evils:
 173                  */
 174                 bmval[0] &= ~FATTR4_WORD0_ACL;
 175 }
 176
 177 static inline void
 178 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 179 {
 180         fh_put(dst);
 181         dget(src->fh_dentry);
 182         if (src->fh_export)
 183                 exp_get(src->fh_export);
 184         *dst = *src;
 185 }
 186
 187 static __be32
 188 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 189 {
 190         __be32 status;
 191
 192         if (open->op_truncate &&
 193                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 194                 return nfserr_inval;
 195
 196         accmode |= NFSD_MAY_READ_IF_EXEC;
 197
 198         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 199                 accmode |= NFSD_MAY_READ;
 200         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 201                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 202         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 203                 accmode |= NFSD_MAY_WRITE;
 204
 205         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 206
 207         return status;
 208 }
 209
 210 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 211 {
 212         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 213
 214         if (S_ISREG(mode))
 215                 return nfs_ok;
 216         if (S_ISDIR(mode))
 217                 return nfserr_isdir;
 218         /*
 219          * Using err_symlink as our catch-all case may look odd; but
 220          * there's no other obvious error for this case in 4.0, and we
 221          * happen to know that it will cause the linux v4 client to do
 222          * the right thing on attempts to open something other than a
 223          * regular file.
 224          */
 225         return nfserr_symlink;
 226 }
 227
 228 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 229 {
 230         if (nfsd4_has_session(cstate))
 231                 return;
 232         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 233                         &resfh->fh_handle);
 234 }
 235
 236 static __be32
 237 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 238 {
 239         struct svc_fh *current_fh = &cstate->current_fh;
 240         int accmode;
 241         __be32 status;
 242
 243         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 244         if (!*resfh)
 245                 return nfserr_jukebox;
 246         fh_init(*resfh, NFS4_FHSIZE);
 247         open->op_truncate = 0;
 248
 249         if (open->op_create) {
 250                 /* FIXME: check session persistence and pnfs flags.
 251                  * The nfsv4.1 spec requires the following semantics:
 252                  *
 253                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 254                  * Reply Cache  | server |                 |
 255                  * -------------+--------+-----------------+--------------------
 256                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 257                  *              |        |                 | (SHOULD)
 258                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 259                  *              |        |                 | (SHOULD NOT)
 260                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 261                  * yes          | no     | GUARDED4        | GUARDED4
 262                  * yes          | yes    | GUARDED4        | GUARDED4
 263                  */
 264
 265                 /*
 266                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 267                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 268                  */
 269                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 270                                         open->op_fname.len, &open->op_iattr,
 271                                         *resfh, open->op_createmode,
 272                                         (u32 *)open->op_verf.data,
 273                                         &open->op_truncate, &open->op_created);
 274
 275                 if (!status && open->op_label.len)
 276                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 277
 278                 /*
 279                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 280                  * use the returned bitmask to indicate which attributes
 281                  * we used to store the verifier:
 282                  */
 283                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 284                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 285                                                 FATTR4_WORD1_TIME_MODIFY);
 286         } else
 287                 /*
 288                  * Note this may exit with the parent still locked.
 289                  * We will hold the lock until nfsd4_open's final
 290                  * lookup, to prevent renames or unlinks until we've had
 291                  * a chance to an acquire a delegation if appropriate.
 292                  */
 293                 status = nfsd_lookup(rqstp, current_fh,
 294                                      open->op_fname.data, open->op_fname.len, *resfh);
 295         if (status)
 296                 goto out;
 297         status = nfsd_check_obj_isreg(*resfh);
 298         if (status)
 299                 goto out;
 300
 301         if (is_create_with_attrs(open) && open->op_acl != NULL)
 302                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 303
 304         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 305         accmode = NFSD_MAY_NOP;
 306         if (open->op_created ||
 307                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 308                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 309         status = do_open_permission(rqstp, *resfh, open, accmode);
 310         set_change_info(&open->op_cinfo, current_fh);
 311 out:
 312         return status;
 313 }
 314
 315 static __be32
 316 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 317 {
 318         struct svc_fh *current_fh = &cstate->current_fh;
 319         __be32 status;
 320         int accmode = 0;
 321
 322         /* We don't know the target directory, and therefore can not
 323         * set the change info
 324         */
 325
 326         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 327
 328         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 329
 330         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 331                 (open->op_iattr.ia_size == 0);
 332         /*
 333          * In the delegation case, the client is telling us about an
 334          * open that it *already* performed locally, some time ago.  We
 335          * should let it succeed now if possible.
 336          *
 337          * In the case of a CLAIM_FH open, on the other hand, the client
 338          * may be counting on us to enforce permissions (the Linux 4.1
 339          * client uses this for normal opens, for example).
 340          */
 341         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 342                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 343
 344         status = do_open_permission(rqstp, current_fh, open, accmode);
 345
 346         return status;
 347 }
 348
 349 static void
 350 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 351 {
 352         struct nfsd4_sessionid *sid =
 353                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 354
 355         clid->cl_boot = sid->clientid.cl_boot;
 356         clid->cl_id = sid->clientid.cl_id;
 357 }
 358
 359 static __be32
 360 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 361            struct nfsd4_open *open)
 362 {
 363         __be32 status;
 364         struct svc_fh *resfh = NULL;
 365         struct net *net = SVC_NET(rqstp);
 366         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 367
 368         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 369                 (int)open->op_fname.len, open->op_fname.data,
 370                 open->op_openowner);
 371
 372         /* This check required by spec. */
 373         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 374                 return nfserr_inval;
 375
 376         open->op_created = 0;
 377         /*
 378          * RFC5661 18.51.3
 379          * Before RECLAIM_COMPLETE done, server should deny new lock
 380          */
 381         if (nfsd4_has_session(cstate) &&
 382             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 383                       &cstate->session->se_client->cl_flags) &&
 384             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 385                 return nfserr_grace;
 386
 387         if (nfsd4_has_session(cstate))
 388                 copy_clientid(&open->op_clientid, cstate->session);
 389
 390         /* check seqid for replay. set nfs4_owner */
 391         status = nfsd4_process_open1(cstate, open, nn);
 392         if (status == nfserr_replay_me) {
 393                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 394                 fh_put(&cstate->current_fh);
 395                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 396                                 &rp->rp_openfh);
 397                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 398                 if (status)
 399                         dprintk("nfsd4_open: replay failed"
 400                                 " restoring previous filehandle\n");
 401                 else
 402                         status = nfserr_replay_me;
 403         }
 404         if (status)
 405                 goto out;
 406         if (open->op_xdr_error) {
 407                 status = open->op_xdr_error;
 408                 goto out;
 409         }
 410
 411         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 412         if (status)
 413                 goto out;
 414
 415         /* Openowner is now set, so sequence id will get bumped.  Now we need
 416          * these checks before we do any creates: */
 417         status = nfserr_grace;
 418         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 419                 goto out;
 420         status = nfserr_no_grace;
 421         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 422                 goto out;
 423
 424         switch (open->op_claim_type) {
 425                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 426                 case NFS4_OPEN_CLAIM_NULL:
 427                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 428                         if (status)
 429                                 goto out;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_PREVIOUS:
 432                         status = nfs4_check_open_reclaim(&open->op_clientid,
 433                                                          cstate, nn);
 434                         if (status)
 435                                 goto out;
 436                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 437                 case NFS4_OPEN_CLAIM_FH:
 438                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 439                         status = do_open_fhandle(rqstp, cstate, open);
 440                         if (status)
 441                                 goto out;
 442                         resfh = &cstate->current_fh;
 443                         break;
 444                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 445                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 446                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 447                                 open->op_claim_type);
 448                         status = nfserr_notsupp;
 449                         goto out;
 450                 default:
 451                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 452                                 open->op_claim_type);
 453                         status = nfserr_inval;
 454                         goto out;
 455         }
 456         /*
 457          * nfsd4_process_open2() does the actual opening of the file.  If
 458          * successful, it (1) truncates the file if open->op_truncate was
 459          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 460          */
 461         status = nfsd4_process_open2(rqstp, resfh, open);
 462         WARN(status && open->op_created,
 463              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 464              be32_to_cpu(status));
 465 out:
 466         if (resfh && resfh != &cstate->current_fh) {
 467                 fh_dup2(&cstate->current_fh, resfh);
 468                 fh_put(resfh);
 469                 kfree(resfh);
 470         }
 471         nfsd4_cleanup_open_state(cstate, open);
 472         nfsd4_bump_seqid(cstate, status);
 473         return status;
 474 }
 475
 476 /*
 477  * OPEN is the only seqid-mutating operation whose decoding can fail
 478  * with a seqid-mutating error (specifically, decoding of user names in
 479  * the attributes).  Therefore we have to do some processing to look up
 480  * the stateowner so that we can bump the seqid.
 481  */
 482 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 483 {
 484         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
 485
 486         if (!seqid_mutating_err(ntohl(op->status)))
 487                 return op->status;
 488         if (nfsd4_has_session(cstate))
 489                 return op->status;
 490         open->op_xdr_error = op->status;
 491         return nfsd4_open(rqstp, cstate, open);
 492 }
 493
 494 /*
 495  * filehandle-manipulating ops.
 496  */
 497 static __be32
 498 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 499             struct svc_fh **getfh)
 500 {
 501         if (!cstate->current_fh.fh_dentry)
 502                 return nfserr_nofilehandle;
 503
 504         *getfh = &cstate->current_fh;
 505         return nfs_ok;
 506 }
 507
 508 static __be32
 509 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510             struct nfsd4_putfh *putfh)
 511 {
 512         fh_put(&cstate->current_fh);
 513         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 514         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 515                putfh->pf_fhlen);
 516         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 517 }
 518
 519 static __be32
 520 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521                 void *arg)
 522 {
 523         __be32 status;
 524
 525         fh_put(&cstate->current_fh);
 526         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 527         return status;
 528 }
 529
 530 static __be32
 531 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 532                 void *arg)
 533 {
 534         if (!cstate->save_fh.fh_dentry)
 535                 return nfserr_restorefh;
 536
 537         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 538         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 539                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 540                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 541         }
 542         return nfs_ok;
 543 }
 544
 545 static __be32
 546 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 547              void *arg)
 548 {
 549         if (!cstate->current_fh.fh_dentry)
 550                 return nfserr_nofilehandle;
 551
 552         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 553         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 554                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 555                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 556         }
 557         return nfs_ok;
 558 }
 559
 560 /*
 561  * misc nfsv4 ops
 562  */
 563 static __be32
 564 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 565              struct nfsd4_access *access)
 566 {
 567         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 568                 return nfserr_inval;
 569
 570         access->ac_resp_access = access->ac_req_access;
 571         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 572                            &access->ac_supported);
 573 }
 574
 575 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 576 {
 577         __be32 verf[2];
 578         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 579
 580         /*
 581          * This is opaque to client, so no need to byte-swap. Use
 582          * __force to keep sparse happy
 583          */
 584         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 585         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 586         memcpy(verifier->data, verf, sizeof(verifier->data));
 587 }
 588
 589 static __be32
 590 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 591              struct nfsd4_commit *commit)
 592 {
 593         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 594         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 595                              commit->co_count);
 596 }
 597
 598 static __be32
 599 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 600              struct nfsd4_create *create)
 601 {
 602         struct svc_fh resfh;
 603         __be32 status;
 604         dev_t rdev;
 605
 606         fh_init(&resfh, NFS4_FHSIZE);
 607
 608         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 609         if (status)
 610                 return status;
 611
 612         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 613                                     nfsd_attrmask);
 614         if (status)
 615                 return status;
 616
 617         switch (create->cr_type) {
 618         case NF4LNK:
 619                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 620                                       create->cr_name, create->cr_namelen,
 621                                       create->cr_data, &resfh);
 622                 break;
 623
 624         case NF4BLK:
 625                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 626                 if (MAJOR(rdev) != create->cr_specdata1 ||
 627                     MINOR(rdev) != create->cr_specdata2)
 628                         return nfserr_inval;
 629                 status = nfsd_create(rqstp, &cstate->current_fh,
 630                                      create->cr_name, create->cr_namelen,
 631                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 632                 break;
 633
 634         case NF4CHR:
 635                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 636                 if (MAJOR(rdev) != create->cr_specdata1 ||
 637                     MINOR(rdev) != create->cr_specdata2)
 638                         return nfserr_inval;
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 642                 break;
 643
 644         case NF4SOCK:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 648                 break;
 649
 650         case NF4FIFO:
 651                 status = nfsd_create(rqstp, &cstate->current_fh,
 652                                      create->cr_name, create->cr_namelen,
 653                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 654                 break;
 655
 656         case NF4DIR:
 657                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 658                 status = nfsd_create(rqstp, &cstate->current_fh,
 659                                      create->cr_name, create->cr_namelen,
 660                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 661                 break;
 662
 663         default:
 664                 status = nfserr_badtype;
 665         }
 666
 667         if (status)
 668                 goto out;
 669
 670         if (create->cr_label.len)
 671                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 672
 673         if (create->cr_acl != NULL)
 674                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 675                                 create->cr_bmval);
 676
 677         fh_unlock(&cstate->current_fh);
 678         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 679         fh_dup2(&cstate->current_fh, &resfh);
 680 out:
 681         fh_put(&resfh);
 682         return status;
 683 }
 684
 685 static __be32
 686 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 687               struct nfsd4_getattr *getattr)
 688 {
 689         __be32 status;
 690
 691         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 692         if (status)
 693                 return status;
 694
 695         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 696                 return nfserr_inval;
 697
 698         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 699         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 700         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 701
 702         getattr->ga_fhp = &cstate->current_fh;
 703         return nfs_ok;
 704 }
 705
 706 static __be32
 707 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 708            struct nfsd4_link *link)
 709 {
 710         __be32 status = nfserr_nofilehandle;
 711
 712         if (!cstate->save_fh.fh_dentry)
 713                 return status;
 714         status = nfsd_link(rqstp, &cstate->current_fh,
 715                            link->li_name, link->li_namelen, &cstate->save_fh);
 716         if (!status)
 717                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 718         return status;
 719 }
 720
 721 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 722 {
 723         struct svc_fh tmp_fh;
 724         __be32 ret;
 725
 726         fh_init(&tmp_fh, NFS4_FHSIZE);
 727         ret = exp_pseudoroot(rqstp, &tmp_fh);
 728         if (ret)
 729                 return ret;
 730         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 731                 fh_put(&tmp_fh);
 732                 return nfserr_noent;
 733         }
 734         fh_put(&tmp_fh);
 735         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 736 }
 737
 738 static __be32
 739 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 740               void *arg)
 741 {
 742         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 743 }
 744
 745 static __be32
 746 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 747              struct nfsd4_lookup *lookup)
 748 {
 749         return nfsd_lookup(rqstp, &cstate->current_fh,
 750                            lookup->lo_name, lookup->lo_len,
 751                            &cstate->current_fh);
 752 }
 753
 754 static __be32
 755 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 756            struct nfsd4_read *read)
 757 {
 758         __be32 status;
 759
 760         read->rd_filp = NULL;
 761         if (read->rd_offset >= OFFSET_MAX)
 762                 return nfserr_inval;
 763
 764         /*
 765          * If we do a zero copy read, then a client will see read data
 766          * that reflects the state of the file *after* performing the
 767          * following compound.
 768          *
 769          * To ensure proper ordering, we therefore turn off zero copy if
 770          * the client wants us to do more in this compound:
 771          */
 772         if (!nfsd4_last_compound_op(rqstp))
 773                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 774
 775         /* check stateid */
 776         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 777                                         &read->rd_stateid, RD_STATE,
 778                                         &read->rd_filp, &read->rd_tmp_file);
 779         if (status) {
 780                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 781                 goto out;
 782         }
 783         status = nfs_ok;
 784 out:
 785         read->rd_rqstp = rqstp;
 786         read->rd_fhp = &cstate->current_fh;
 787         return status;
 788 }
 789
 790 static __be32
 791 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 792               struct nfsd4_readdir *readdir)
 793 {
 794         u64 cookie = readdir->rd_cookie;
 795         static const nfs4_verifier zeroverf;
 796
 797         /* no need to check permission - this will be done in nfsd_readdir() */
 798
 799         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 800                 return nfserr_inval;
 801
 802         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 803         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 804         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 805
 806         if ((cookie == 1) || (cookie == 2) ||
 807             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 808                 return nfserr_bad_cookie;
 809
 810         readdir->rd_rqstp = rqstp;
 811         readdir->rd_fhp = &cstate->current_fh;
 812         return nfs_ok;
 813 }
 814
 815 static __be32
 816 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 817                struct nfsd4_readlink *readlink)
 818 {
 819         readlink->rl_rqstp = rqstp;
 820         readlink->rl_fhp = &cstate->current_fh;
 821         return nfs_ok;
 822 }
 823
 824 static __be32
 825 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 826              struct nfsd4_remove *remove)
 827 {
 828         __be32 status;
 829
 830         if (opens_in_grace(SVC_NET(rqstp)))
 831                 return nfserr_grace;
 832         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 833                              remove->rm_name, remove->rm_namelen);
 834         if (!status) {
 835                 fh_unlock(&cstate->current_fh);
 836                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 837         }
 838         return status;
 839 }
 840
 841 static __be32
 842 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 843              struct nfsd4_rename *rename)
 844 {
 845         __be32 status = nfserr_nofilehandle;
 846
 847         if (!cstate->save_fh.fh_dentry)
 848                 return status;
 849         if (opens_in_grace(SVC_NET(rqstp)) &&
 850                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 851                 return nfserr_grace;
 852         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 853                              rename->rn_snamelen, &cstate->current_fh,
 854                              rename->rn_tname, rename->rn_tnamelen);
 855         if (status)
 856                 return status;
 857         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 858         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 859         return nfs_ok;
 860 }
 861
 862 static __be32
 863 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 864               struct nfsd4_secinfo *secinfo)
 865 {
 866         struct svc_export *exp;
 867         struct dentry *dentry;
 868         __be32 err;
 869
 870         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 871         if (err)
 872                 return err;
 873         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 874                                     secinfo->si_name, secinfo->si_namelen,
 875                                     &exp, &dentry);
 876         if (err)
 877                 return err;
 878         fh_unlock(&cstate->current_fh);
 879         if (d_really_is_negative(dentry)) {
 880                 exp_put(exp);
 881                 err = nfserr_noent;
 882         } else
 883                 secinfo->si_exp = exp;
 884         dput(dentry);
 885         if (cstate->minorversion)
 886                 /* See rfc 5661 section 2.6.3.1.1.8 */
 887                 fh_put(&cstate->current_fh);
 888         return err;
 889 }
 890
 891 static __be32
 892 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 893               struct nfsd4_secinfo_no_name *sin)
 894 {
 895         __be32 err;
 896
 897         switch (sin->sin_style) {
 898         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 899                 break;
 900         case NFS4_SECINFO_STYLE4_PARENT:
 901                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 902                 if (err)
 903                         return err;
 904                 break;
 905         default:
 906                 return nfserr_inval;
 907         }
 908
 909         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 910         fh_put(&cstate->current_fh);
 911         return nfs_ok;
 912 }
 913
 914 static __be32
 915 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 916               struct nfsd4_setattr *setattr)
 917 {
 918         __be32 status = nfs_ok;
 919         int err;
 920
 921         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 922                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 923                                 &cstate->current_fh, &setattr->sa_stateid,
 924                                 WR_STATE, NULL, NULL);
 925                 if (status) {
 926                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 927                         return status;
 928                 }
 929         }
 930         err = fh_want_write(&cstate->current_fh);
 931         if (err)
 932                 return nfserrno(err);
 933         status = nfs_ok;
 934
 935         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 936                                     nfsd_attrmask);
 937         if (status)
 938                 goto out;
 939
 940         if (setattr->sa_acl != NULL)
 941                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 942                                             setattr->sa_acl);
 943         if (status)
 944                 goto out;
 945         if (setattr->sa_label.len)
 946                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 947                                 &setattr->sa_label);
 948         if (status)
 949                 goto out;
 950         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 951                                 0, (time_t)0);
 952 out:
 953         fh_drop_write(&cstate->current_fh);
 954         return status;
 955 }
 956
 957 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 958 {
 959         int i = 1;
 960         int buflen = write->wr_buflen;
 961
 962         vec[0].iov_base = write->wr_head.iov_base;
 963         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 964         buflen -= vec[0].iov_len;
 965
 966         while (buflen) {
 967                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 968                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 969                 buflen -= vec[i].iov_len;
 970                 i++;
 971         }
 972         return i;
 973 }
 974
 975 static __be32
 976 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 977             struct nfsd4_write *write)
 978 {
 979         stateid_t *stateid = &write->wr_stateid;
 980         struct file *filp = NULL;
 981         __be32 status = nfs_ok;
 982         unsigned long cnt;
 983         int nvecs;
 984
 985         if (write->wr_offset > (u64)OFFSET_MAX ||
 986             write->wr_offset + write->wr_buflen > (u64)OFFSET_MAX)
 987                 return nfserr_fbig;
 988
 989         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 990                                                 stateid, WR_STATE, &filp, NULL);
 991         if (status) {
 992                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 993                 return status;
 994         }
 995
 996         cnt = write->wr_buflen;
 997         write->wr_how_written = write->wr_stable_how;
 998         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
 999
1000         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1001         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1002
1003         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1004                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1005                                 &write->wr_how_written);
1006         fput(filp);
1007
1008         write->wr_bytes_written = cnt;
1009
1010         return status;
1011 }
1012
1013 static __be32
1014 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1015                   stateid_t *src_stateid, struct file **src,
1016                   stateid_t *dst_stateid, struct file **dst)
1017 {
1018         __be32 status;
1019
1020         if (!cstate->save_fh.fh_dentry)
1021                 return nfserr_nofilehandle;
1022
1023         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1024                                             src_stateid, RD_STATE, src, NULL);
1025         if (status) {
1026                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1027                 goto out;
1028         }
1029
1030         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1031                                             dst_stateid, WR_STATE, dst, NULL);
1032         if (status) {
1033                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1034                 goto out_put_src;
1035         }
1036
1037         /* fix up for NFS-specific error code */
1038         if (!S_ISREG(file_inode(*src)->i_mode) ||
1039             !S_ISREG(file_inode(*dst)->i_mode)) {
1040                 status = nfserr_wrong_type;
1041                 goto out_put_dst;
1042         }
1043
1044 out:
1045         return status;
1046 out_put_dst:
1047         fput(*dst);
1048 out_put_src:
1049         fput(*src);
1050         goto out;
1051 }
1052
1053 static __be32
1054 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1055                 struct nfsd4_clone *clone)
1056 {
1057         struct file *src, *dst;
1058         __be32 status;
1059
1060         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1061                                    &clone->cl_dst_stateid, &dst);
1062         if (status)
1063                 goto out;
1064
1065         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1066                         dst, clone->cl_dst_pos, clone->cl_count);
1067
1068         fput(dst);
1069         fput(src);
1070 out:
1071         return status;
1072 }
1073
1074 static __be32
1075 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1076                 struct nfsd4_copy *copy)
1077 {
1078         struct file *src, *dst;
1079         __be32 status;
1080         ssize_t bytes;
1081
1082         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1083                                    &copy->cp_dst_stateid, &dst);
1084         if (status)
1085                 goto out;
1086
1087         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1088                         dst, copy->cp_dst_pos, copy->cp_count);
1089
1090         if (bytes < 0)
1091                 status = nfserrno(bytes);
1092         else {
1093                 copy->cp_res.wr_bytes_written = bytes;
1094                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1095                 copy->cp_consecutive = 1;
1096                 copy->cp_synchronous = 1;
1097                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1098                 status = nfs_ok;
1099         }
1100
1101         fput(src);
1102         fput(dst);
1103 out:
1104         return status;
1105 }
1106
1107 static __be32
1108 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1109                 struct nfsd4_fallocate *fallocate, int flags)
1110 {
1111         __be32 status = nfserr_notsupp;
1112         struct file *file;
1113
1114         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1115                                             &fallocate->falloc_stateid,
1116                                             WR_STATE, &file, NULL);
1117         if (status != nfs_ok) {
1118                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1119                 return status;
1120         }
1121
1122         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1123                                      fallocate->falloc_offset,
1124                                      fallocate->falloc_length,
1125                                      flags);
1126         fput(file);
1127         return status;
1128 }
1129
1130 static __be32
1131 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1132                struct nfsd4_fallocate *fallocate)
1133 {
1134         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1135 }
1136
1137 static __be32
1138 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1139                  struct nfsd4_fallocate *fallocate)
1140 {
1141         return nfsd4_fallocate(rqstp, cstate, fallocate,
1142                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1143 }
1144
1145 static __be32
1146 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1147                 struct nfsd4_seek *seek)
1148 {
1149         int whence;
1150         __be32 status;
1151         struct file *file;
1152
1153         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1154                                             &seek->seek_stateid,
1155                                             RD_STATE, &file, NULL);
1156         if (status) {
1157                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1158                 return status;
1159         }
1160
1161         switch (seek->seek_whence) {
1162         case NFS4_CONTENT_DATA:
1163                 whence = SEEK_DATA;
1164                 break;
1165         case NFS4_CONTENT_HOLE:
1166                 whence = SEEK_HOLE;
1167                 break;
1168         default:
1169                 status = nfserr_union_notsupp;
1170                 goto out;
1171         }
1172
1173         /*
1174          * Note:  This call does change file->f_pos, but nothing in NFSD
1175          *        should ever file->f_pos.
1176          */
1177         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1178         if (seek->seek_pos < 0)
1179                 status = nfserrno(seek->seek_pos);
1180         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1181                 seek->seek_eof = true;
1182
1183 out:
1184         fput(file);
1185         return status;
1186 }
1187
1188 /* This routine never returns NFS_OK!  If there are no other errors, it
1189  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1190  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1191  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1192  */
1193 static __be32
1194 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1195              struct nfsd4_verify *verify)
1196 {
1197         __be32 *buf, *p;
1198         int count;
1199         __be32 status;
1200
1201         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1202         if (status)
1203                 return status;
1204
1205         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1206         if (status)
1207                 return status;
1208
1209         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1210             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1211                 return nfserr_inval;
1212         if (verify->ve_attrlen & 3)
1213                 return nfserr_inval;
1214
1215         /* count in words:
1216          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1217          */
1218         count = 4 + (verify->ve_attrlen >> 2);
1219         buf = kmalloc(count << 2, GFP_KERNEL);
1220         if (!buf)
1221                 return nfserr_jukebox;
1222
1223         p = buf;
1224         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1225                                     cstate->current_fh.fh_export,
1226                                     cstate->current_fh.fh_dentry,
1227                                     verify->ve_bmval,
1228                                     rqstp, 0);
1229         /*
1230          * If nfsd4_encode_fattr() ran out of space, assume that's because
1231          * the attributes are longer (hence different) than those given:
1232          */
1233         if (status == nfserr_resource)
1234                 status = nfserr_not_same;
1235         if (status)
1236                 goto out_kfree;
1237
1238         /* skip bitmap */
1239         p = buf + 1 + ntohl(buf[0]);
1240         status = nfserr_not_same;
1241         if (ntohl(*p++) != verify->ve_attrlen)
1242                 goto out_kfree;
1243         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1244                 status = nfserr_same;
1245
1246 out_kfree:
1247         kfree(buf);
1248         return status;
1249 }
1250
1251 static __be32
1252 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1253               struct nfsd4_verify *verify)
1254 {
1255         __be32 status;
1256
1257         status = _nfsd4_verify(rqstp, cstate, verify);
1258         return status == nfserr_not_same ? nfs_ok : status;
1259 }
1260
1261 static __be32
1262 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1263              struct nfsd4_verify *verify)
1264 {
1265         __be32 status;
1266
1267         status = _nfsd4_verify(rqstp, cstate, verify);
1268         return status == nfserr_same ? nfs_ok : status;
1269 }
1270
1271 #ifdef CONFIG_NFSD_PNFS
1272 static const struct nfsd4_layout_ops *
1273 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1274 {
1275         if (!exp->ex_layout_types) {
1276                 dprintk("%s: export does not support pNFS\n", __func__);
1277                 return NULL;
1278         }
1279
1280         if (layout_type >= LAYOUT_TYPE_MAX ||
1281             !(exp->ex_layout_types & (1 << layout_type))) {
1282                 dprintk("%s: layout type %d not supported\n",
1283                         __func__, layout_type);
1284                 return NULL;
1285         }
1286
1287         return nfsd4_layout_ops[layout_type];
1288 }
1289
1290 static __be32
1291 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1292                 struct nfsd4_compound_state *cstate,
1293                 struct nfsd4_getdeviceinfo *gdp)
1294 {
1295         const struct nfsd4_layout_ops *ops;
1296         struct nfsd4_deviceid_map *map;
1297         struct svc_export *exp;
1298         __be32 nfserr;
1299
1300         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1301                __func__,
1302                gdp->gd_layout_type,
1303                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1304                gdp->gd_maxcount);
1305
1306         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1307         if (!map) {
1308                 dprintk("%s: couldn't find device ID to export mapping!\n",
1309                         __func__);
1310                 return nfserr_noent;
1311         }
1312
1313         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1314         if (IS_ERR(exp)) {
1315                 dprintk("%s: could not find device id\n", __func__);
1316                 return nfserr_noent;
1317         }
1318
1319         nfserr = nfserr_layoutunavailable;
1320         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1321         if (!ops)
1322                 goto out;
1323
1324         nfserr = nfs_ok;
1325         if (gdp->gd_maxcount != 0) {
1326                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1327                                 rqstp, cstate->session->se_client, gdp);
1328         }
1329
1330         gdp->gd_notify_types &= ops->notify_types;
1331 out:
1332         exp_put(exp);
1333         return nfserr;
1334 }
1335
1336 static __be32
1337 nfsd4_layoutget(struct svc_rqst *rqstp,
1338                 struct nfsd4_compound_state *cstate,
1339                 struct nfsd4_layoutget *lgp)
1340 {
1341         struct svc_fh *current_fh = &cstate->current_fh;
1342         const struct nfsd4_layout_ops *ops;
1343         struct nfs4_layout_stateid *ls;
1344         __be32 nfserr;
1345         int accmode = NFSD_MAY_READ_IF_EXEC;
1346
1347         switch (lgp->lg_seg.iomode) {
1348         case IOMODE_READ:
1349                 accmode |= NFSD_MAY_READ;
1350                 break;
1351         case IOMODE_RW:
1352                 accmode |= NFSD_MAY_READ | NFSD_MAY_WRITE;
1353                 break;
1354         default:
1355                 dprintk("%s: invalid iomode %d\n",
1356                         __func__, lgp->lg_seg.iomode);
1357                 nfserr = nfserr_badiomode;
1358                 goto out;
1359         }
1360
1361         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1362         if (nfserr)
1363                 goto out;
1364
1365         nfserr = nfserr_layoutunavailable;
1366         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1367         if (!ops)
1368                 goto out;
1369
1370         /*
1371          * Verify minlength and range as per RFC5661:
1372          *  o  If loga_length is less than loga_minlength,
1373          *     the metadata server MUST return NFS4ERR_INVAL.
1374          *  o  If the sum of loga_offset and loga_minlength exceeds
1375          *     NFS4_UINT64_MAX, and loga_minlength is not
1376          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1377          *  o  If the sum of loga_offset and loga_length exceeds
1378          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1379          *     the error NFS4ERR_INVAL MUST result.
1380          */
1381         nfserr = nfserr_inval;
1382         if (lgp->lg_seg.length < lgp->lg_minlength ||
1383             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1384              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1385             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1386              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1387                 goto out;
1388         if (lgp->lg_seg.length == 0)
1389                 goto out;
1390
1391         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1392                                                 true, lgp->lg_layout_type, &ls);
1393         if (nfserr) {
1394                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1395                 goto out;
1396         }
1397
1398         nfserr = nfserr_recallconflict;
1399         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1400                 goto out_put_stid;
1401
1402         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1403                                      current_fh, lgp);
1404         if (nfserr)
1405                 goto out_put_stid;
1406
1407         nfserr = nfsd4_insert_layout(lgp, ls);
1408
1409 out_put_stid:
1410         mutex_unlock(&ls->ls_mutex);
1411         nfs4_put_stid(&ls->ls_stid);
1412 out:
1413         return nfserr;
1414 }
1415
1416 static __be32
1417 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1418                 struct nfsd4_compound_state *cstate,
1419                 struct nfsd4_layoutcommit *lcp)
1420 {
1421         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1422         struct svc_fh *current_fh = &cstate->current_fh;
1423         const struct nfsd4_layout_ops *ops;
1424         loff_t new_size = lcp->lc_last_wr + 1;
1425         struct inode *inode;
1426         struct nfs4_layout_stateid *ls;
1427         __be32 nfserr;
1428
1429         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1430         if (nfserr)
1431                 goto out;
1432
1433         nfserr = nfserr_layoutunavailable;
1434         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1435         if (!ops)
1436                 goto out;
1437         inode = d_inode(current_fh->fh_dentry);
1438
1439         nfserr = nfserr_inval;
1440         if (new_size <= seg->offset) {
1441                 dprintk("pnfsd: last write before layout segment\n");
1442                 goto out;
1443         }
1444         if (new_size > seg->offset + seg->length) {
1445                 dprintk("pnfsd: last write beyond layout segment\n");
1446                 goto out;
1447         }
1448         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1449                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1450                 goto out;
1451         }
1452
1453         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1454                                                 false, lcp->lc_layout_type,
1455                                                 &ls);
1456         if (nfserr) {
1457                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1458                 /* fixup error code as per RFC5661 */
1459                 if (nfserr == nfserr_bad_stateid)
1460                         nfserr = nfserr_badlayout;
1461                 goto out;
1462         }
1463
1464         /* LAYOUTCOMMIT does not require any serialization */
1465         mutex_unlock(&ls->ls_mutex);
1466
1467         if (new_size > i_size_read(inode)) {
1468                 lcp->lc_size_chg = 1;
1469                 lcp->lc_newsize = new_size;
1470         } else {
1471                 lcp->lc_size_chg = 0;
1472         }
1473
1474         nfserr = ops->proc_layoutcommit(inode, lcp);
1475         nfs4_put_stid(&ls->ls_stid);
1476 out:
1477         return nfserr;
1478 }
1479
1480 static __be32
1481 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1482                 struct nfsd4_compound_state *cstate,
1483                 struct nfsd4_layoutreturn *lrp)
1484 {
1485         struct svc_fh *current_fh = &cstate->current_fh;
1486         __be32 nfserr;
1487
1488         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1489         if (nfserr)
1490                 goto out;
1491
1492         nfserr = nfserr_layoutunavailable;
1493         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1494                 goto out;
1495
1496         switch (lrp->lr_seg.iomode) {
1497         case IOMODE_READ:
1498         case IOMODE_RW:
1499         case IOMODE_ANY:
1500                 break;
1501         default:
1502                 dprintk("%s: invalid iomode %d\n", __func__,
1503                         lrp->lr_seg.iomode);
1504                 nfserr = nfserr_inval;
1505                 goto out;
1506         }
1507
1508         switch (lrp->lr_return_type) {
1509         case RETURN_FILE:
1510                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1511                 break;
1512         case RETURN_FSID:
1513         case RETURN_ALL:
1514                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1515                 break;
1516         default:
1517                 dprintk("%s: invalid return_type %d\n", __func__,
1518                         lrp->lr_return_type);
1519                 nfserr = nfserr_inval;
1520                 break;
1521         }
1522 out:
1523         return nfserr;
1524 }
1525 #endif /* CONFIG_NFSD_PNFS */
1526
1527 /*
1528  * NULL call.
1529  */
1530 static __be32
1531 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1532 {
1533         return nfs_ok;
1534 }
1535
1536 static inline void nfsd4_increment_op_stats(u32 opnum)
1537 {
1538         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1539                 nfsdstats.nfs4_opcount[opnum]++;
1540 }
1541
1542 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1543                               void *);
1544 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1545 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1546 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1547
1548 enum nfsd4_op_flags {
1549         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1550         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1551         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1552         /* For rfc 5661 section 2.6.3.1.1: */
1553         OP_HANDLES_WRONGSEC = 1 << 3,
1554         OP_IS_PUTFH_LIKE = 1 << 4,
1555         /*
1556          * These are the ops whose result size we estimate before
1557          * encoding, to avoid performing an op then not being able to
1558          * respond or cache a response.  This includes writes and setattrs
1559          * as well as the operations usually called "nonidempotent":
1560          */
1561         OP_MODIFIES_SOMETHING = 1 << 5,
1562         /*
1563          * Cache compounds containing these ops in the xid-based drc:
1564          * We use the DRC for compounds containing non-idempotent
1565          * operations, *except* those that are 4.1-specific (since
1566          * sessions provide their own EOS), and except for stateful
1567          * operations other than setclientid and setclientid_confirm
1568          * (since sequence numbers provide EOS for open, lock, etc in
1569          * the v4.0 case).
1570          */
1571         OP_CACHEME = 1 << 6,
1572         /*
1573          * These are ops which clear current state id.
1574          */
1575         OP_CLEAR_STATEID = 1 << 7,
1576 };
1577
1578 struct nfsd4_operation {
1579         nfsd4op_func op_func;
1580         u32 op_flags;
1581         char *op_name;
1582         /* Try to get response size before operation */
1583         nfsd4op_rsize op_rsize_bop;
1584         stateid_getter op_get_currentstateid;
1585         stateid_setter op_set_currentstateid;
1586 };
1587
1588 static struct nfsd4_operation nfsd4_ops[];
1589
1590 static const char *nfsd4_op_name(unsigned opnum);
1591
1592 /*
1593  * Enforce NFSv4.1 COMPOUND ordering rules:
1594  *
1595  * Also note, enforced elsewhere:
1596  *      - SEQUENCE other than as first op results in
1597  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1598  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1599  *        (Enforced in nfsd4_bind_conn_to_session().)
1600  *      - DESTROY_SESSION must be the final operation in a compound, if
1601  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1602  *        (Enforced in nfsd4_destroy_session().)
1603  */
1604 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1605 {
1606         struct nfsd4_op *op = &args->ops[0];
1607
1608         /* These ordering requirements don't apply to NFSv4.0: */
1609         if (args->minorversion == 0)
1610                 return nfs_ok;
1611         /* This is weird, but OK, not our problem: */
1612         if (args->opcnt == 0)
1613                 return nfs_ok;
1614         if (op->status == nfserr_op_illegal)
1615                 return nfs_ok;
1616         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1617                 return nfserr_op_not_in_session;
1618         if (op->opnum == OP_SEQUENCE)
1619                 return nfs_ok;
1620         if (args->opcnt != 1)
1621                 return nfserr_not_only_op;
1622         return nfs_ok;
1623 }
1624
1625 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1626 {
1627         return &nfsd4_ops[op->opnum];
1628 }
1629
1630 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1631 {
1632         if (op->opnum == OP_ILLEGAL)
1633                 return false;
1634         return OPDESC(op)->op_flags & OP_CACHEME;
1635 }
1636
1637 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1638 {
1639         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1640         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1641         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1642         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1643         struct nfsd4_operation *thisd;
1644         struct nfsd4_operation *nextd;
1645
1646         thisd = OPDESC(this);
1647         /*
1648          * Most ops check wronsec on our own; only the putfh-like ops
1649          * have special rules.
1650          */
1651         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1652                 return false;
1653         /*
1654          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1655          * put-filehandle operation if we're not going to use the
1656          * result:
1657          */
1658         if (argp->opcnt == resp->opcnt)
1659                 return false;
1660         if (next->opnum == OP_ILLEGAL)
1661                 return false;
1662         nextd = OPDESC(next);
1663         /*
1664          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1665          * errors themselves as necessary; others should check for them
1666          * now:
1667          */
1668         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1669 }
1670
1671 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1672                                struct nfsd4_compoundres *resp)
1673 {
1674         struct xdr_stream *xdr = &resp->xdr;
1675         struct xdr_buf *buf = &rqstp->rq_res;
1676         struct kvec *head = buf->head;
1677
1678         xdr->buf = buf;
1679         xdr->iov = head;
1680         xdr->p   = head->iov_base + head->iov_len;
1681         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1682         /* Tail and page_len should be zero at this point: */
1683         buf->len = buf->head[0].iov_len;
1684         xdr->scratch.iov_len = 0;
1685         xdr->page_ptr = buf->pages - 1;
1686         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1687                 - rqstp->rq_auth_slack;
1688 }
1689
1690 /*
1691  * COMPOUND call.
1692  */
1693 static __be32
1694 nfsd4_proc_compound(struct svc_rqst *rqstp,
1695                     struct nfsd4_compoundargs *args,
1696                     struct nfsd4_compoundres *resp)
1697 {
1698         struct nfsd4_op *op;
1699         struct nfsd4_operation *opdesc;
1700         struct nfsd4_compound_state *cstate = &resp->cstate;
1701         struct svc_fh *current_fh = &cstate->current_fh;
1702         struct svc_fh *save_fh = &cstate->save_fh;
1703         __be32          status;
1704
1705         svcxdr_init_encode(rqstp, resp);
1706         resp->tagp = resp->xdr.p;
1707         /* reserve space for: taglen, tag, and opcnt */
1708         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1709         resp->taglen = args->taglen;
1710         resp->tag = args->tag;
1711         resp->rqstp = rqstp;
1712         cstate->minorversion = args->minorversion;
1713         fh_init(current_fh, NFS4_FHSIZE);
1714         fh_init(save_fh, NFS4_FHSIZE);
1715         /*
1716          * Don't use the deferral mechanism for NFSv4; compounds make it
1717          * too hard to avoid non-idempotency problems.
1718          */
1719         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1720
1721         /*
1722          * According to RFC3010, this takes precedence over all other errors.
1723          */
1724         status = nfserr_minor_vers_mismatch;
1725         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1726                 goto out;
1727
1728         status = nfs41_check_op_ordering(args);
1729         if (status) {
1730                 op = &args->ops[0];
1731                 op->status = status;
1732                 resp->opcnt = 1;
1733                 goto encode_op;
1734         }
1735
1736         while (!status && resp->opcnt < args->opcnt) {
1737                 op = &args->ops[resp->opcnt++];
1738
1739                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1740                         resp->opcnt, args->opcnt, op->opnum,
1741                         nfsd4_op_name(op->opnum));
1742                 /*
1743                  * The XDR decode routines may have pre-set op->status;
1744                  * for example, if there is a miscellaneous XDR error
1745                  * it will be set to nfserr_bad_xdr.
1746                  */
1747                 if (op->status) {
1748                         if (op->opnum == OP_OPEN)
1749                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1750                         goto encode_op;
1751                 }
1752
1753                 opdesc = OPDESC(op);
1754
1755                 if (!current_fh->fh_dentry) {
1756                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1757                                 op->status = nfserr_nofilehandle;
1758                                 goto encode_op;
1759                         }
1760                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1761                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1762                         op->status = nfserr_moved;
1763                         goto encode_op;
1764                 }
1765
1766                 fh_clear_wcc(current_fh);
1767
1768                 /* If op is non-idempotent */
1769                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1770                         /*
1771                          * Don't execute this op if we couldn't encode a
1772                          * succesful reply:
1773                          */
1774                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1775                         /*
1776                          * Plus if there's another operation, make sure
1777                          * we'll have space to at least encode an error:
1778                          */
1779                         if (resp->opcnt < args->opcnt)
1780                                 plen += COMPOUND_ERR_SLACK_SPACE;
1781                         op->status = nfsd4_check_resp_size(resp, plen);
1782                 }
1783
1784                 if (op->status)
1785                         goto encode_op;
1786
1787                 if (opdesc->op_get_currentstateid)
1788                         opdesc->op_get_currentstateid(cstate, &op->u);
1789                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1790
1791                 /* Only from SEQUENCE */
1792                 if (cstate->status == nfserr_replay_cache) {
1793                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1794                         status = op->status;
1795                         goto out;
1796                 }
1797                 if (!op->status) {
1798                         if (opdesc->op_set_currentstateid)
1799                                 opdesc->op_set_currentstateid(cstate, &op->u);
1800
1801                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1802                                 clear_current_stateid(cstate);
1803
1804                         if (need_wrongsec_check(rqstp))
1805                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1806                 }
1807 encode_op:
1808                 if (op->status == nfserr_replay_me) {
1809                         op->replay = &cstate->replay_owner->so_replay;
1810                         nfsd4_encode_replay(&resp->xdr, op);
1811                         status = op->status = op->replay->rp_status;
1812                 } else {
1813                         nfsd4_encode_operation(resp, op);
1814                         status = op->status;
1815                 }
1816
1817                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1818                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1819                         be32_to_cpu(status));
1820
1821                 nfsd4_cstate_clear_replay(cstate);
1822                 nfsd4_increment_op_stats(op->opnum);
1823         }
1824
1825         cstate->status = status;
1826         fh_put(current_fh);
1827         fh_put(save_fh);
1828         BUG_ON(cstate->replay_owner);
1829 out:
1830         /* Reset deferral mechanism for RPC deferrals */
1831         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1832         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1833         return status;
1834 }
1835
1836 #define op_encode_hdr_size              (2)
1837 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1838 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1839 #define op_encode_change_info_maxsz     (5)
1840 #define nfs4_fattr_bitmap_maxsz         (4)
1841
1842 /* We'll fall back on returning no lockowner if run out of space: */
1843 #define op_encode_lockowner_maxsz       (0)
1844 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1845
1846 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1847
1848 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1849 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1850                                          op_encode_ace_maxsz)
1851
1852 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1853
1854 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1855 {
1856         return (op_encode_hdr_size) * sizeof(__be32);
1857 }
1858
1859 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1860 {
1861         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1862 }
1863
1864 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1865 {
1866         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1867 }
1868
1869 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1870 {
1871         return (op_encode_hdr_size + op_encode_change_info_maxsz
1872                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1873 }
1874
1875 /*
1876  * Note since this is an idempotent operation we won't insist on failing
1877  * the op prematurely if the estimate is too large.  We may turn off splice
1878  * reads unnecessarily.
1879  */
1880 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1881                                       struct nfsd4_op *op)
1882 {
1883         u32 *bmap = op->u.getattr.ga_bmval;
1884         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1885         u32 ret = 0;
1886
1887         if (bmap0 & FATTR4_WORD0_ACL)
1888                 return svc_max_payload(rqstp);
1889         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1890                 return svc_max_payload(rqstp);
1891
1892         if (bmap1 & FATTR4_WORD1_OWNER) {
1893                 ret += IDMAP_NAMESZ + 4;
1894                 bmap1 &= ~FATTR4_WORD1_OWNER;
1895         }
1896         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1897                 ret += IDMAP_NAMESZ + 4;
1898                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1899         }
1900         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1901                 ret += NFS4_FHSIZE + 4;
1902                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1903         }
1904         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1905                 ret += NFS4_MAXLABELLEN + 12;
1906                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1907         }
1908         /*
1909          * Largest of remaining attributes are 16 bytes (e.g.,
1910          * supported_attributes)
1911          */
1912         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1913         /* bitmask, length */
1914         ret += 20;
1915         return ret;
1916 }
1917
1918 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1919 {
1920         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1921                 * sizeof(__be32);
1922 }
1923
1924 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1925 {
1926         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1927                 * sizeof(__be32);
1928 }
1929
1930 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1931 {
1932         return (op_encode_hdr_size + op_encode_stateid_maxsz
1933                 + op_encode_change_info_maxsz + 1
1934                 + nfs4_fattr_bitmap_maxsz
1935                 + op_encode_delegation_maxsz) * sizeof(__be32);
1936 }
1937
1938 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1939 {
1940         u32 maxcount = 0, rlen = 0;
1941
1942         maxcount = svc_max_payload(rqstp);
1943         rlen = min(op->u.read.rd_length, maxcount);
1944
1945         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1946 }
1947
1948 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1949 {
1950         u32 maxcount = 0, rlen = 0;
1951
1952         maxcount = svc_max_payload(rqstp);
1953         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1954
1955         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1956                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1957 }
1958
1959 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1960 {
1961         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1962                 * sizeof(__be32);
1963 }
1964
1965 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1966 {
1967         return (op_encode_hdr_size + op_encode_change_info_maxsz
1968                 + op_encode_change_info_maxsz) * sizeof(__be32);
1969 }
1970
1971 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1972                                        struct nfsd4_op *op)
1973 {
1974         return (op_encode_hdr_size
1975                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1976 }
1977
1978 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1979 {
1980         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1981 }
1982
1983 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1984 {
1985         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1986                                                                 sizeof(__be32);
1987 }
1988
1989 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1990 {
1991         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1992 }
1993
1994 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1995 {
1996         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1997                 1 + 1 + /* eir_flags, spr_how */\
1998                 4 + /* spo_must_enforce & _allow with bitmap */\
1999                 2 + /*eir_server_owner.so_minor_id */\
2000                 /* eir_server_owner.so_major_id<> */\
2001                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2002                 /* eir_server_scope<> */\
2003                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2004                 1 + /* eir_server_impl_id array length */\
2005                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2006 }
2007
2008 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2009 {
2010         return (op_encode_hdr_size + \
2011                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2012                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2013 }
2014
2015 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2016 {
2017         return (op_encode_hdr_size + \
2018                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2019                 2 + /* csr_sequence, csr_flags */\
2020                 op_encode_channel_attrs_maxsz + \
2021                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2022 }
2023
2024 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2025 {
2026         return (op_encode_hdr_size +
2027                 1 /* wr_callback */ +
2028                 op_encode_stateid_maxsz /* wr_callback */ +
2029                 2 /* wr_count */ +
2030                 1 /* wr_committed */ +
2031                 op_encode_verifier_maxsz +
2032                 1 /* cr_consecutive */ +
2033                 1 /* cr_synchronous */) * sizeof(__be32);
2034 }
2035
2036 #ifdef CONFIG_NFSD_PNFS
2037 /*
2038  * At this stage we don't really know what layout driver will handle the request,
2039  * so we need to define an arbitrary upper bound here.
2040  */
2041 #define MAX_LAYOUT_SIZE         128
2042 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2043 {
2044         return (op_encode_hdr_size +
2045                 1 /* logr_return_on_close */ +
2046                 op_encode_stateid_maxsz +
2047                 1 /* nr of layouts */ +
2048                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2049 }
2050
2051 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2052 {
2053         return (op_encode_hdr_size +
2054                 1 /* locr_newsize */ +
2055                 2 /* ns_size */) * sizeof(__be32);
2056 }
2057
2058 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2059 {
2060         return (op_encode_hdr_size +
2061                 1 /* lrs_stateid */ +
2062                 op_encode_stateid_maxsz) * sizeof(__be32);
2063 }
2064 #endif /* CONFIG_NFSD_PNFS */
2065
2066 static struct nfsd4_operation nfsd4_ops[] = {
2067         [OP_ACCESS] = {
2068                 .op_func = (nfsd4op_func)nfsd4_access,
2069                 .op_name = "OP_ACCESS",
2070         },
2071         [OP_CLOSE] = {
2072                 .op_func = (nfsd4op_func)nfsd4_close,
2073                 .op_flags = OP_MODIFIES_SOMETHING,
2074                 .op_name = "OP_CLOSE",
2075                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2076                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
2077                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
2078         },
2079         [OP_COMMIT] = {
2080                 .op_func = (nfsd4op_func)nfsd4_commit,
2081                 .op_flags = OP_MODIFIES_SOMETHING,
2082                 .op_name = "OP_COMMIT",
2083                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
2084         },
2085         [OP_CREATE] = {
2086                 .op_func = (nfsd4op_func)nfsd4_create,
2087                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2088                 .op_name = "OP_CREATE",
2089                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
2090         },
2091         [OP_DELEGRETURN] = {
2092                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
2093                 .op_flags = OP_MODIFIES_SOMETHING,
2094                 .op_name = "OP_DELEGRETURN",
2095                 .op_rsize_bop = nfsd4_only_status_rsize,
2096                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
2097         },
2098         [OP_GETATTR] = {
2099                 .op_func = (nfsd4op_func)nfsd4_getattr,
2100                 .op_flags = ALLOWED_ON_ABSENT_FS,
2101                 .op_rsize_bop = nfsd4_getattr_rsize,
2102                 .op_name = "OP_GETATTR",
2103         },
2104         [OP_GETFH] = {
2105                 .op_func = (nfsd4op_func)nfsd4_getfh,
2106                 .op_name = "OP_GETFH",
2107         },
2108         [OP_LINK] = {
2109                 .op_func = (nfsd4op_func)nfsd4_link,
2110                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2111                                 | OP_CACHEME,
2112                 .op_name = "OP_LINK",
2113                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2114         },
2115         [OP_LOCK] = {
2116                 .op_func = (nfsd4op_func)nfsd4_lock,
2117                 .op_flags = OP_MODIFIES_SOMETHING,
2118                 .op_name = "OP_LOCK",
2119                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2120                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2121         },
2122         [OP_LOCKT] = {
2123                 .op_func = (nfsd4op_func)nfsd4_lockt,
2124                 .op_name = "OP_LOCKT",
2125         },
2126         [OP_LOCKU] = {
2127                 .op_func = (nfsd4op_func)nfsd4_locku,
2128                 .op_flags = OP_MODIFIES_SOMETHING,
2129                 .op_name = "OP_LOCKU",
2130                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2131                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2132         },
2133         [OP_LOOKUP] = {
2134                 .op_func = (nfsd4op_func)nfsd4_lookup,
2135                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2136                 .op_name = "OP_LOOKUP",
2137         },
2138         [OP_LOOKUPP] = {
2139                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2140                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2141                 .op_name = "OP_LOOKUPP",
2142         },
2143         [OP_NVERIFY] = {
2144                 .op_func = (nfsd4op_func)nfsd4_nverify,
2145                 .op_name = "OP_NVERIFY",
2146         },
2147         [OP_OPEN] = {
2148                 .op_func = (nfsd4op_func)nfsd4_open,
2149                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2150                 .op_name = "OP_OPEN",
2151                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2152                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2153         },
2154         [OP_OPEN_CONFIRM] = {
2155                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2156                 .op_flags = OP_MODIFIES_SOMETHING,
2157                 .op_name = "OP_OPEN_CONFIRM",
2158                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2159         },
2160         [OP_OPEN_DOWNGRADE] = {
2161                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2162                 .op_flags = OP_MODIFIES_SOMETHING,
2163                 .op_name = "OP_OPEN_DOWNGRADE",
2164                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2165                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2166                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2167         },
2168         [OP_PUTFH] = {
2169                 .op_func = (nfsd4op_func)nfsd4_putfh,
2170                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2171                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2172                 .op_name = "OP_PUTFH",
2173                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2174         },
2175         [OP_PUTPUBFH] = {
2176                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2177                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2178                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2179                 .op_name = "OP_PUTPUBFH",
2180                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2181         },
2182         [OP_PUTROOTFH] = {
2183                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2184                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2185                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2186                 .op_name = "OP_PUTROOTFH",
2187                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2188         },
2189         [OP_READ] = {
2190                 .op_func = (nfsd4op_func)nfsd4_read,
2191                 .op_name = "OP_READ",
2192                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2193                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2194         },
2195         [OP_READDIR] = {
2196                 .op_func = (nfsd4op_func)nfsd4_readdir,
2197                 .op_name = "OP_READDIR",
2198                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2199         },
2200         [OP_READLINK] = {
2201                 .op_func = (nfsd4op_func)nfsd4_readlink,
2202                 .op_name = "OP_READLINK",
2203         },
2204         [OP_REMOVE] = {
2205                 .op_func = (nfsd4op_func)nfsd4_remove,
2206                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2207                 .op_name = "OP_REMOVE",
2208                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2209         },
2210         [OP_RENAME] = {
2211                 .op_func = (nfsd4op_func)nfsd4_rename,
2212                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2213                 .op_name = "OP_RENAME",
2214                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2215         },
2216         [OP_RENEW] = {
2217                 .op_func = (nfsd4op_func)nfsd4_renew,
2218                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2219                                 | OP_MODIFIES_SOMETHING,
2220                 .op_name = "OP_RENEW",
2221                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2222
2223         },
2224         [OP_RESTOREFH] = {
2225                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2226                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2227                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2228                 .op_name = "OP_RESTOREFH",
2229                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2230         },
2231         [OP_SAVEFH] = {
2232                 .op_func = (nfsd4op_func)nfsd4_savefh,
2233                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2234                 .op_name = "OP_SAVEFH",
2235                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2236         },
2237         [OP_SECINFO] = {
2238                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2239                 .op_flags = OP_HANDLES_WRONGSEC,
2240                 .op_name = "OP_SECINFO",
2241         },
2242         [OP_SETATTR] = {
2243                 .op_func = (nfsd4op_func)nfsd4_setattr,
2244                 .op_name = "OP_SETATTR",
2245                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2246                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2247                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2248         },
2249         [OP_SETCLIENTID] = {
2250                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2251                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2252                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2253                 .op_name = "OP_SETCLIENTID",
2254                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2255         },
2256         [OP_SETCLIENTID_CONFIRM] = {
2257                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2258                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2259                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2260                 .op_name = "OP_SETCLIENTID_CONFIRM",
2261                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2262         },
2263         [OP_VERIFY] = {
2264                 .op_func = (nfsd4op_func)nfsd4_verify,
2265                 .op_name = "OP_VERIFY",
2266         },
2267         [OP_WRITE] = {
2268                 .op_func = (nfsd4op_func)nfsd4_write,
2269                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2270                 .op_name = "OP_WRITE",
2271                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2272                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2273         },
2274         [OP_RELEASE_LOCKOWNER] = {
2275                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2276                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2277                                 | OP_MODIFIES_SOMETHING,
2278                 .op_name = "OP_RELEASE_LOCKOWNER",
2279                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2280         },
2281
2282         /* NFSv4.1 operations */
2283         [OP_EXCHANGE_ID] = {
2284                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2285                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2286                                 | OP_MODIFIES_SOMETHING,
2287                 .op_name = "OP_EXCHANGE_ID",
2288                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2289         },
2290         [OP_BACKCHANNEL_CTL] = {
2291                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2292                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2293                 .op_name = "OP_BACKCHANNEL_CTL",
2294                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2295         },
2296         [OP_BIND_CONN_TO_SESSION] = {
2297                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2298                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2299                                 | OP_MODIFIES_SOMETHING,
2300                 .op_name = "OP_BIND_CONN_TO_SESSION",
2301                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2302         },
2303         [OP_CREATE_SESSION] = {
2304                 .op_func = (nfsd4op_func)nfsd4_create_session,
2305                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2306                                 | OP_MODIFIES_SOMETHING,
2307                 .op_name = "OP_CREATE_SESSION",
2308                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2309         },
2310         [OP_DESTROY_SESSION] = {
2311                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2312                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2313                                 | OP_MODIFIES_SOMETHING,
2314                 .op_name = "OP_DESTROY_SESSION",
2315                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2316         },
2317         [OP_SEQUENCE] = {
2318                 .op_func = (nfsd4op_func)nfsd4_sequence,
2319                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2320                 .op_name = "OP_SEQUENCE",
2321                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2322         },
2323         [OP_DESTROY_CLIENTID] = {
2324                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2325                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2326                                 | OP_MODIFIES_SOMETHING,
2327                 .op_name = "OP_DESTROY_CLIENTID",
2328                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2329         },
2330         [OP_RECLAIM_COMPLETE] = {
2331                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2332                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2333                 .op_name = "OP_RECLAIM_COMPLETE",
2334                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2335         },
2336         [OP_SECINFO_NO_NAME] = {
2337                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2338                 .op_flags = OP_HANDLES_WRONGSEC,
2339                 .op_name = "OP_SECINFO_NO_NAME",
2340         },
2341         [OP_TEST_STATEID] = {
2342                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2343                 .op_flags = ALLOWED_WITHOUT_FH,
2344                 .op_name = "OP_TEST_STATEID",
2345         },
2346         [OP_FREE_STATEID] = {
2347                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2348                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2349                 .op_name = "OP_FREE_STATEID",
2350                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2351                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2352         },
2353 #ifdef CONFIG_NFSD_PNFS
2354         [OP_GETDEVICEINFO] = {
2355                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2356                 .op_flags = ALLOWED_WITHOUT_FH,
2357                 .op_name = "OP_GETDEVICEINFO",
2358         },
2359         [OP_LAYOUTGET] = {
2360                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2361                 .op_flags = OP_MODIFIES_SOMETHING,
2362                 .op_name = "OP_LAYOUTGET",
2363                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2364         },
2365         [OP_LAYOUTCOMMIT] = {
2366                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2367                 .op_flags = OP_MODIFIES_SOMETHING,
2368                 .op_name = "OP_LAYOUTCOMMIT",
2369                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2370         },
2371         [OP_LAYOUTRETURN] = {
2372                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2373                 .op_flags = OP_MODIFIES_SOMETHING,
2374                 .op_name = "OP_LAYOUTRETURN",
2375                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2376         },
2377 #endif /* CONFIG_NFSD_PNFS */
2378
2379         /* NFSv4.2 operations */
2380         [OP_ALLOCATE] = {
2381                 .op_func = (nfsd4op_func)nfsd4_allocate,
2382                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2383                 .op_name = "OP_ALLOCATE",
2384                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2385         },
2386         [OP_DEALLOCATE] = {
2387                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2388                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2389                 .op_name = "OP_DEALLOCATE",
2390                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2391         },
2392         [OP_CLONE] = {
2393                 .op_func = (nfsd4op_func)nfsd4_clone,
2394                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2395                 .op_name = "OP_CLONE",
2396                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2397         },
2398         [OP_COPY] = {
2399                 .op_func = (nfsd4op_func)nfsd4_copy,
2400                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2401                 .op_name = "OP_COPY",
2402                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_copy_rsize,
2403         },
2404         [OP_SEEK] = {
2405                 .op_func = (nfsd4op_func)nfsd4_seek,
2406                 .op_name = "OP_SEEK",
2407         },
2408 };
2409
2410 /**
2411  * nfsd4_spo_must_allow - Determine if the compound op contains an
2412  * operation that is allowed to be sent with machine credentials
2413  *
2414  * @rqstp: a pointer to the struct svc_rqst
2415  *
2416  * Checks to see if the compound contains a spo_must_allow op
2417  * and confirms that it was sent with the proper machine creds.
2418  */
2419
2420 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2421 {
2422         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2423         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2424         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2425         struct nfsd4_compound_state *cstate = &resp->cstate;
2426         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2427         u32 opiter;
2428
2429         if (!cstate->minorversion)
2430                 return false;
2431
2432         if (cstate->spo_must_allowed == true)
2433                 return true;
2434
2435         opiter = resp->opcnt;
2436         while (opiter < argp->opcnt) {
2437                 this = &argp->ops[opiter++];
2438                 if (test_bit(this->opnum, allow->u.longs) &&
2439                         cstate->clp->cl_mach_cred &&
2440                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2441                         cstate->spo_must_allowed = true;
2442                         return true;
2443                 }
2444         }
2445         cstate->spo_must_allowed = false;
2446         return false;
2447 }
2448
2449 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2450 {
2451         struct nfsd4_operation *opdesc;
2452         nfsd4op_rsize estimator;
2453
2454         if (op->opnum == OP_ILLEGAL)
2455                 return op_encode_hdr_size * sizeof(__be32);
2456         opdesc = OPDESC(op);
2457         estimator = opdesc->op_rsize_bop;
2458         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2459 }
2460
2461 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2462 {
2463         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2464                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2465                         op->opnum, nfsd4_op_name(op->opnum));
2466                 WARN_ON_ONCE(1);
2467         }
2468 }
2469
2470 static const char *nfsd4_op_name(unsigned opnum)
2471 {
2472         if (opnum < ARRAY_SIZE(nfsd4_ops))
2473                 return nfsd4_ops[opnum].op_name;
2474         return "unknown_operation";
2475 }
2476
2477 #define nfsd4_voidres                   nfsd4_voidargs
2478 struct nfsd4_voidargs { int dummy; };
2479
2480 static struct svc_procedure             nfsd_procedures4[2] = {
2481         [NFSPROC4_NULL] = {
2482                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2483                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2484                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2485                 .pc_ressize = sizeof(struct nfsd4_voidres),
2486                 .pc_cachetype = RC_NOCACHE,
2487                 .pc_xdrressize = 1,
2488         },
2489         [NFSPROC4_COMPOUND] = {
2490                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2491                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2492                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2493                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2494                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2495                 .pc_release = nfsd4_release_compoundargs,
2496                 .pc_cachetype = RC_NOCACHE,
2497                 .pc_xdrressize = NFSD_BUFSIZE/4,
2498         },
2499 };
2500
2501 struct svc_version      nfsd_version4 = {
2502                 .vs_vers        = 4,
2503                 .vs_nproc       = 2,
2504                 .vs_proc        = nfsd_procedures4,
2505                 .vs_dispatch    = nfsd_dispatch,
2506                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2507                 .vs_rpcb_optnl  = 1,
2508 };
2509
2510 /*
2511  * Local variables:
2512  *  c-basic-offset: 8
2513  * End:
2514  */