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         /*
 609          * We just check that parent is accessible here, nfsd_* do their
 610          * own access permission checks
 611          */
 612         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
 613                            NFSD_MAY_EXEC);
 614         if (status)
 615                 return status;
 616
 617         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 618                                     nfsd_attrmask);
 619         if (status)
 620                 return status;
 621
 622         switch (create->cr_type) {
 623         case NF4LNK:
 624                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 625                                       create->cr_name, create->cr_namelen,
 626                                       create->cr_data, &resfh);
 627                 break;
 628
 629         case NF4BLK:
 630                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 631                 if (MAJOR(rdev) != create->cr_specdata1 ||
 632                     MINOR(rdev) != create->cr_specdata2)
 633                         return nfserr_inval;
 634                 status = nfsd_create(rqstp, &cstate->current_fh,
 635                                      create->cr_name, create->cr_namelen,
 636                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 637                 break;
 638
 639         case NF4CHR:
 640                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 641                 if (MAJOR(rdev) != create->cr_specdata1 ||
 642                     MINOR(rdev) != create->cr_specdata2)
 643                         return nfserr_inval;
 644                 status = nfsd_create(rqstp, &cstate->current_fh,
 645                                      create->cr_name, create->cr_namelen,
 646                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 647                 break;
 648
 649         case NF4SOCK:
 650                 status = nfsd_create(rqstp, &cstate->current_fh,
 651                                      create->cr_name, create->cr_namelen,
 652                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 653                 break;
 654
 655         case NF4FIFO:
 656                 status = nfsd_create(rqstp, &cstate->current_fh,
 657                                      create->cr_name, create->cr_namelen,
 658                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 659                 break;
 660
 661         case NF4DIR:
 662                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 663                 status = nfsd_create(rqstp, &cstate->current_fh,
 664                                      create->cr_name, create->cr_namelen,
 665                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 666                 break;
 667
 668         default:
 669                 status = nfserr_badtype;
 670         }
 671
 672         if (status)
 673                 goto out;
 674
 675         if (create->cr_label.len)
 676                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 677
 678         if (create->cr_acl != NULL)
 679                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 680                                 create->cr_bmval);
 681
 682         fh_unlock(&cstate->current_fh);
 683         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 684         fh_dup2(&cstate->current_fh, &resfh);
 685 out:
 686         fh_put(&resfh);
 687         return status;
 688 }
 689
 690 static __be32
 691 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 692               struct nfsd4_getattr *getattr)
 693 {
 694         __be32 status;
 695
 696         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 697         if (status)
 698                 return status;
 699
 700         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 701                 return nfserr_inval;
 702
 703         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 704         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 705         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 706
 707         getattr->ga_fhp = &cstate->current_fh;
 708         return nfs_ok;
 709 }
 710
 711 static __be32
 712 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 713            struct nfsd4_link *link)
 714 {
 715         __be32 status = nfserr_nofilehandle;
 716
 717         if (!cstate->save_fh.fh_dentry)
 718                 return status;
 719         status = nfsd_link(rqstp, &cstate->current_fh,
 720                            link->li_name, link->li_namelen, &cstate->save_fh);
 721         if (!status)
 722                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 723         return status;
 724 }
 725
 726 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 727 {
 728         struct svc_fh tmp_fh;
 729         __be32 ret;
 730
 731         fh_init(&tmp_fh, NFS4_FHSIZE);
 732         ret = exp_pseudoroot(rqstp, &tmp_fh);
 733         if (ret)
 734                 return ret;
 735         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 736                 fh_put(&tmp_fh);
 737                 return nfserr_noent;
 738         }
 739         fh_put(&tmp_fh);
 740         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 741 }
 742
 743 static __be32
 744 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 745               void *arg)
 746 {
 747         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 748 }
 749
 750 static __be32
 751 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 752              struct nfsd4_lookup *lookup)
 753 {
 754         return nfsd_lookup(rqstp, &cstate->current_fh,
 755                            lookup->lo_name, lookup->lo_len,
 756                            &cstate->current_fh);
 757 }
 758
 759 static __be32
 760 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 761            struct nfsd4_read *read)
 762 {
 763         __be32 status;
 764
 765         read->rd_filp = NULL;
 766         if (read->rd_offset >= OFFSET_MAX)
 767                 return nfserr_inval;
 768
 769         /*
 770          * If we do a zero copy read, then a client will see read data
 771          * that reflects the state of the file *after* performing the
 772          * following compound.
 773          *
 774          * To ensure proper ordering, we therefore turn off zero copy if
 775          * the client wants us to do more in this compound:
 776          */
 777         if (!nfsd4_last_compound_op(rqstp))
 778                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 779
 780         /* check stateid */
 781         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 782                                         &read->rd_stateid, RD_STATE,
 783                                         &read->rd_filp, &read->rd_tmp_file);
 784         if (status) {
 785                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 786                 goto out;
 787         }
 788         status = nfs_ok;
 789 out:
 790         read->rd_rqstp = rqstp;
 791         read->rd_fhp = &cstate->current_fh;
 792         return status;
 793 }
 794
 795 static __be32
 796 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 797               struct nfsd4_readdir *readdir)
 798 {
 799         u64 cookie = readdir->rd_cookie;
 800         static const nfs4_verifier zeroverf;
 801
 802         /* no need to check permission - this will be done in nfsd_readdir() */
 803
 804         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 805                 return nfserr_inval;
 806
 807         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
 808         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
 809         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
 810
 811         if ((cookie == 1) || (cookie == 2) ||
 812             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 813                 return nfserr_bad_cookie;
 814
 815         readdir->rd_rqstp = rqstp;
 816         readdir->rd_fhp = &cstate->current_fh;
 817         return nfs_ok;
 818 }
 819
 820 static __be32
 821 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 822                struct nfsd4_readlink *readlink)
 823 {
 824         readlink->rl_rqstp = rqstp;
 825         readlink->rl_fhp = &cstate->current_fh;
 826         return nfs_ok;
 827 }
 828
 829 static __be32
 830 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 831              struct nfsd4_remove *remove)
 832 {
 833         __be32 status;
 834
 835         if (opens_in_grace(SVC_NET(rqstp)))
 836                 return nfserr_grace;
 837         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 838                              remove->rm_name, remove->rm_namelen);
 839         if (!status) {
 840                 fh_unlock(&cstate->current_fh);
 841                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 842         }
 843         return status;
 844 }
 845
 846 static __be32
 847 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 848              struct nfsd4_rename *rename)
 849 {
 850         __be32 status = nfserr_nofilehandle;
 851
 852         if (!cstate->save_fh.fh_dentry)
 853                 return status;
 854         if (opens_in_grace(SVC_NET(rqstp)) &&
 855                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 856                 return nfserr_grace;
 857         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 858                              rename->rn_snamelen, &cstate->current_fh,
 859                              rename->rn_tname, rename->rn_tnamelen);
 860         if (status)
 861                 return status;
 862         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 863         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 864         return nfs_ok;
 865 }
 866
 867 static __be32
 868 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 869               struct nfsd4_secinfo *secinfo)
 870 {
 871         struct svc_export *exp;
 872         struct dentry *dentry;
 873         __be32 err;
 874
 875         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 876         if (err)
 877                 return err;
 878         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 879                                     secinfo->si_name, secinfo->si_namelen,
 880                                     &exp, &dentry);
 881         if (err)
 882                 return err;
 883         fh_unlock(&cstate->current_fh);
 884         if (d_really_is_negative(dentry)) {
 885                 exp_put(exp);
 886                 err = nfserr_noent;
 887         } else
 888                 secinfo->si_exp = exp;
 889         dput(dentry);
 890         if (cstate->minorversion)
 891                 /* See rfc 5661 section 2.6.3.1.1.8 */
 892                 fh_put(&cstate->current_fh);
 893         return err;
 894 }
 895
 896 static __be32
 897 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 898               struct nfsd4_secinfo_no_name *sin)
 899 {
 900         __be32 err;
 901
 902         switch (sin->sin_style) {
 903         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 904                 break;
 905         case NFS4_SECINFO_STYLE4_PARENT:
 906                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 907                 if (err)
 908                         return err;
 909                 break;
 910         default:
 911                 return nfserr_inval;
 912         }
 913
 914         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
 915         fh_put(&cstate->current_fh);
 916         return nfs_ok;
 917 }
 918
 919 static __be32
 920 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 921               struct nfsd4_setattr *setattr)
 922 {
 923         __be32 status = nfs_ok;
 924         int err;
 925
 926         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 927                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 928                                 &cstate->current_fh, &setattr->sa_stateid,
 929                                 WR_STATE, NULL, NULL);
 930                 if (status) {
 931                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 932                         return status;
 933                 }
 934         }
 935         err = fh_want_write(&cstate->current_fh);
 936         if (err)
 937                 return nfserrno(err);
 938         status = nfs_ok;
 939
 940         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 941                                     nfsd_attrmask);
 942         if (status)
 943                 goto out;
 944
 945         if (setattr->sa_acl != NULL)
 946                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 947                                             setattr->sa_acl);
 948         if (status)
 949                 goto out;
 950         if (setattr->sa_label.len)
 951                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 952                                 &setattr->sa_label);
 953         if (status)
 954                 goto out;
 955         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 956                                 0, (time_t)0);
 957 out:
 958         fh_drop_write(&cstate->current_fh);
 959         return status;
 960 }
 961
 962 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 963 {
 964         int i = 1;
 965         int buflen = write->wr_buflen;
 966
 967         vec[0].iov_base = write->wr_head.iov_base;
 968         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 969         buflen -= vec[0].iov_len;
 970
 971         while (buflen) {
 972                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 973                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 974                 buflen -= vec[i].iov_len;
 975                 i++;
 976         }
 977         return i;
 978 }
 979
 980 static __be32
 981 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 982             struct nfsd4_write *write)
 983 {
 984         stateid_t *stateid = &write->wr_stateid;
 985         struct file *filp = NULL;
 986         __be32 status = nfs_ok;
 987         unsigned long cnt;
 988         int nvecs;
 989
 990         if (write->wr_offset >= OFFSET_MAX)
 991                 return nfserr_inval;
 992
 993         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 994                                                 stateid, WR_STATE, &filp, NULL);
 995         if (status) {
 996                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
 997                 return status;
 998         }
 999
1000         cnt = write->wr_buflen;
1001         write->wr_how_written = write->wr_stable_how;
1002         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1003
1004         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1005         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1006
1007         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1008                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1009                                 &write->wr_how_written);
1010         fput(filp);
1011
1012         write->wr_bytes_written = cnt;
1013
1014         return status;
1015 }
1016
1017 static __be32
1018 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1019                 struct nfsd4_clone *clone)
1020 {
1021         struct file *src, *dst;
1022         __be32 status;
1023
1024         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1025                                             &clone->cl_src_stateid, RD_STATE,
1026                                             &src, NULL);
1027         if (status) {
1028                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1029                 goto out;
1030         }
1031
1032         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1033                                             &clone->cl_dst_stateid, WR_STATE,
1034                                             &dst, NULL);
1035         if (status) {
1036                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1037                 goto out_put_src;
1038         }
1039
1040         /* fix up for NFS-specific error code */
1041         if (!S_ISREG(file_inode(src)->i_mode) ||
1042             !S_ISREG(file_inode(dst)->i_mode)) {
1043                 status = nfserr_wrong_type;
1044                 goto out_put_dst;
1045         }
1046
1047         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1048                         dst, clone->cl_dst_pos, clone->cl_count);
1049
1050 out_put_dst:
1051         fput(dst);
1052 out_put_src:
1053         fput(src);
1054 out:
1055         return status;
1056 }
1057
1058 static __be32
1059 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1060                 struct nfsd4_fallocate *fallocate, int flags)
1061 {
1062         __be32 status = nfserr_notsupp;
1063         struct file *file;
1064
1065         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1066                                             &fallocate->falloc_stateid,
1067                                             WR_STATE, &file, NULL);
1068         if (status != nfs_ok) {
1069                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1070                 return status;
1071         }
1072
1073         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1074                                      fallocate->falloc_offset,
1075                                      fallocate->falloc_length,
1076                                      flags);
1077         fput(file);
1078         return status;
1079 }
1080
1081 static __be32
1082 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1083                struct nfsd4_fallocate *fallocate)
1084 {
1085         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1086 }
1087
1088 static __be32
1089 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1090                  struct nfsd4_fallocate *fallocate)
1091 {
1092         return nfsd4_fallocate(rqstp, cstate, fallocate,
1093                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1094 }
1095
1096 static __be32
1097 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1098                 struct nfsd4_seek *seek)
1099 {
1100         int whence;
1101         __be32 status;
1102         struct file *file;
1103
1104         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1105                                             &seek->seek_stateid,
1106                                             RD_STATE, &file, NULL);
1107         if (status) {
1108                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1109                 return status;
1110         }
1111
1112         switch (seek->seek_whence) {
1113         case NFS4_CONTENT_DATA:
1114                 whence = SEEK_DATA;
1115                 break;
1116         case NFS4_CONTENT_HOLE:
1117                 whence = SEEK_HOLE;
1118                 break;
1119         default:
1120                 status = nfserr_union_notsupp;
1121                 goto out;
1122         }
1123
1124         /*
1125          * Note:  This call does change file->f_pos, but nothing in NFSD
1126          *        should ever file->f_pos.
1127          */
1128         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1129         if (seek->seek_pos < 0)
1130                 status = nfserrno(seek->seek_pos);
1131         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1132                 seek->seek_eof = true;
1133
1134 out:
1135         fput(file);
1136         return status;
1137 }
1138
1139 /* This routine never returns NFS_OK!  If there are no other errors, it
1140  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1141  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1142  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1143  */
1144 static __be32
1145 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1146              struct nfsd4_verify *verify)
1147 {
1148         __be32 *buf, *p;
1149         int count;
1150         __be32 status;
1151
1152         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1153         if (status)
1154                 return status;
1155
1156         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1157         if (status)
1158                 return status;
1159
1160         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1161             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1162                 return nfserr_inval;
1163         if (verify->ve_attrlen & 3)
1164                 return nfserr_inval;
1165
1166         /* count in words:
1167          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1168          */
1169         count = 4 + (verify->ve_attrlen >> 2);
1170         buf = kmalloc(count << 2, GFP_KERNEL);
1171         if (!buf)
1172                 return nfserr_jukebox;
1173
1174         p = buf;
1175         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1176                                     cstate->current_fh.fh_export,
1177                                     cstate->current_fh.fh_dentry,
1178                                     verify->ve_bmval,
1179                                     rqstp, 0);
1180         /*
1181          * If nfsd4_encode_fattr() ran out of space, assume that's because
1182          * the attributes are longer (hence different) than those given:
1183          */
1184         if (status == nfserr_resource)
1185                 status = nfserr_not_same;
1186         if (status)
1187                 goto out_kfree;
1188
1189         /* skip bitmap */
1190         p = buf + 1 + ntohl(buf[0]);
1191         status = nfserr_not_same;
1192         if (ntohl(*p++) != verify->ve_attrlen)
1193                 goto out_kfree;
1194         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1195                 status = nfserr_same;
1196
1197 out_kfree:
1198         kfree(buf);
1199         return status;
1200 }
1201
1202 static __be32
1203 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1204               struct nfsd4_verify *verify)
1205 {
1206         __be32 status;
1207
1208         status = _nfsd4_verify(rqstp, cstate, verify);
1209         return status == nfserr_not_same ? nfs_ok : status;
1210 }
1211
1212 static __be32
1213 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1214              struct nfsd4_verify *verify)
1215 {
1216         __be32 status;
1217
1218         status = _nfsd4_verify(rqstp, cstate, verify);
1219         return status == nfserr_same ? nfs_ok : status;
1220 }
1221
1222 #ifdef CONFIG_NFSD_PNFS
1223 static const struct nfsd4_layout_ops *
1224 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1225 {
1226         if (!exp->ex_layout_types) {
1227                 dprintk("%s: export does not support pNFS\n", __func__);
1228                 return NULL;
1229         }
1230
1231         if (!(exp->ex_layout_types & (1 << layout_type))) {
1232                 dprintk("%s: layout type %d not supported\n",
1233                         __func__, layout_type);
1234                 return NULL;
1235         }
1236
1237         return nfsd4_layout_ops[layout_type];
1238 }
1239
1240 static __be32
1241 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1242                 struct nfsd4_compound_state *cstate,
1243                 struct nfsd4_getdeviceinfo *gdp)
1244 {
1245         const struct nfsd4_layout_ops *ops;
1246         struct nfsd4_deviceid_map *map;
1247         struct svc_export *exp;
1248         __be32 nfserr;
1249
1250         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1251                __func__,
1252                gdp->gd_layout_type,
1253                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1254                gdp->gd_maxcount);
1255
1256         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1257         if (!map) {
1258                 dprintk("%s: couldn't find device ID to export mapping!\n",
1259                         __func__);
1260                 return nfserr_noent;
1261         }
1262
1263         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1264         if (IS_ERR(exp)) {
1265                 dprintk("%s: could not find device id\n", __func__);
1266                 return nfserr_noent;
1267         }
1268
1269         nfserr = nfserr_layoutunavailable;
1270         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1271         if (!ops)
1272                 goto out;
1273
1274         nfserr = nfs_ok;
1275         if (gdp->gd_maxcount != 0) {
1276                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1277                                 rqstp, cstate->session->se_client, gdp);
1278         }
1279
1280         gdp->gd_notify_types &= ops->notify_types;
1281 out:
1282         exp_put(exp);
1283         return nfserr;
1284 }
1285
1286 static __be32
1287 nfsd4_layoutget(struct svc_rqst *rqstp,
1288                 struct nfsd4_compound_state *cstate,
1289                 struct nfsd4_layoutget *lgp)
1290 {
1291         struct svc_fh *current_fh = &cstate->current_fh;
1292         const struct nfsd4_layout_ops *ops;
1293         struct nfs4_layout_stateid *ls;
1294         __be32 nfserr;
1295         int accmode;
1296
1297         switch (lgp->lg_seg.iomode) {
1298         case IOMODE_READ:
1299                 accmode = NFSD_MAY_READ;
1300                 break;
1301         case IOMODE_RW:
1302                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1303                 break;
1304         default:
1305                 dprintk("%s: invalid iomode %d\n",
1306                         __func__, lgp->lg_seg.iomode);
1307                 nfserr = nfserr_badiomode;
1308                 goto out;
1309         }
1310
1311         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1312         if (nfserr)
1313                 goto out;
1314
1315         nfserr = nfserr_layoutunavailable;
1316         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1317         if (!ops)
1318                 goto out;
1319
1320         /*
1321          * Verify minlength and range as per RFC5661:
1322          *  o  If loga_length is less than loga_minlength,
1323          *     the metadata server MUST return NFS4ERR_INVAL.
1324          *  o  If the sum of loga_offset and loga_minlength exceeds
1325          *     NFS4_UINT64_MAX, and loga_minlength is not
1326          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1327          *  o  If the sum of loga_offset and loga_length exceeds
1328          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1329          *     the error NFS4ERR_INVAL MUST result.
1330          */
1331         nfserr = nfserr_inval;
1332         if (lgp->lg_seg.length < lgp->lg_minlength ||
1333             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1334              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1335             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1336              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1337                 goto out;
1338         if (lgp->lg_seg.length == 0)
1339                 goto out;
1340
1341         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1342                                                 true, lgp->lg_layout_type, &ls);
1343         if (nfserr) {
1344                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1345                 goto out;
1346         }
1347
1348         nfserr = nfserr_recallconflict;
1349         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1350                 goto out_put_stid;
1351
1352         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1353                                      current_fh, lgp);
1354         if (nfserr)
1355                 goto out_put_stid;
1356
1357         nfserr = nfsd4_insert_layout(lgp, ls);
1358
1359 out_put_stid:
1360         mutex_unlock(&ls->ls_mutex);
1361         nfs4_put_stid(&ls->ls_stid);
1362 out:
1363         return nfserr;
1364 }
1365
1366 static __be32
1367 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1368                 struct nfsd4_compound_state *cstate,
1369                 struct nfsd4_layoutcommit *lcp)
1370 {
1371         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1372         struct svc_fh *current_fh = &cstate->current_fh;
1373         const struct nfsd4_layout_ops *ops;
1374         loff_t new_size = lcp->lc_last_wr + 1;
1375         struct inode *inode;
1376         struct nfs4_layout_stateid *ls;
1377         __be32 nfserr;
1378
1379         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1380         if (nfserr)
1381                 goto out;
1382
1383         nfserr = nfserr_layoutunavailable;
1384         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1385         if (!ops)
1386                 goto out;
1387         inode = d_inode(current_fh->fh_dentry);
1388
1389         nfserr = nfserr_inval;
1390         if (new_size <= seg->offset) {
1391                 dprintk("pnfsd: last write before layout segment\n");
1392                 goto out;
1393         }
1394         if (new_size > seg->offset + seg->length) {
1395                 dprintk("pnfsd: last write beyond layout segment\n");
1396                 goto out;
1397         }
1398         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1399                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1400                 goto out;
1401         }
1402
1403         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1404                                                 false, lcp->lc_layout_type,
1405                                                 &ls);
1406         if (nfserr) {
1407                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1408                 /* fixup error code as per RFC5661 */
1409                 if (nfserr == nfserr_bad_stateid)
1410                         nfserr = nfserr_badlayout;
1411                 goto out;
1412         }
1413
1414         /* LAYOUTCOMMIT does not require any serialization */
1415         mutex_unlock(&ls->ls_mutex);
1416
1417         if (new_size > i_size_read(inode)) {
1418                 lcp->lc_size_chg = 1;
1419                 lcp->lc_newsize = new_size;
1420         } else {
1421                 lcp->lc_size_chg = 0;
1422         }
1423
1424         nfserr = ops->proc_layoutcommit(inode, lcp);
1425         nfs4_put_stid(&ls->ls_stid);
1426 out:
1427         return nfserr;
1428 }
1429
1430 static __be32
1431 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1432                 struct nfsd4_compound_state *cstate,
1433                 struct nfsd4_layoutreturn *lrp)
1434 {
1435         struct svc_fh *current_fh = &cstate->current_fh;
1436         __be32 nfserr;
1437
1438         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1439         if (nfserr)
1440                 goto out;
1441
1442         nfserr = nfserr_layoutunavailable;
1443         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1444                 goto out;
1445
1446         switch (lrp->lr_seg.iomode) {
1447         case IOMODE_READ:
1448         case IOMODE_RW:
1449         case IOMODE_ANY:
1450                 break;
1451         default:
1452                 dprintk("%s: invalid iomode %d\n", __func__,
1453                         lrp->lr_seg.iomode);
1454                 nfserr = nfserr_inval;
1455                 goto out;
1456         }
1457
1458         switch (lrp->lr_return_type) {
1459         case RETURN_FILE:
1460                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1461                 break;
1462         case RETURN_FSID:
1463         case RETURN_ALL:
1464                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1465                 break;
1466         default:
1467                 dprintk("%s: invalid return_type %d\n", __func__,
1468                         lrp->lr_return_type);
1469                 nfserr = nfserr_inval;
1470                 break;
1471         }
1472 out:
1473         return nfserr;
1474 }
1475 #endif /* CONFIG_NFSD_PNFS */
1476
1477 /*
1478  * NULL call.
1479  */
1480 static __be32
1481 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1482 {
1483         return nfs_ok;
1484 }
1485
1486 static inline void nfsd4_increment_op_stats(u32 opnum)
1487 {
1488         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1489                 nfsdstats.nfs4_opcount[opnum]++;
1490 }
1491
1492 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1493                               void *);
1494 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1495 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1496 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1497
1498 enum nfsd4_op_flags {
1499         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1500         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1501         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1502         /* For rfc 5661 section 2.6.3.1.1: */
1503         OP_HANDLES_WRONGSEC = 1 << 3,
1504         OP_IS_PUTFH_LIKE = 1 << 4,
1505         /*
1506          * These are the ops whose result size we estimate before
1507          * encoding, to avoid performing an op then not being able to
1508          * respond or cache a response.  This includes writes and setattrs
1509          * as well as the operations usually called "nonidempotent":
1510          */
1511         OP_MODIFIES_SOMETHING = 1 << 5,
1512         /*
1513          * Cache compounds containing these ops in the xid-based drc:
1514          * We use the DRC for compounds containing non-idempotent
1515          * operations, *except* those that are 4.1-specific (since
1516          * sessions provide their own EOS), and except for stateful
1517          * operations other than setclientid and setclientid_confirm
1518          * (since sequence numbers provide EOS for open, lock, etc in
1519          * the v4.0 case).
1520          */
1521         OP_CACHEME = 1 << 6,
1522         /*
1523          * These are ops which clear current state id.
1524          */
1525         OP_CLEAR_STATEID = 1 << 7,
1526 };
1527
1528 struct nfsd4_operation {
1529         nfsd4op_func op_func;
1530         u32 op_flags;
1531         char *op_name;
1532         /* Try to get response size before operation */
1533         nfsd4op_rsize op_rsize_bop;
1534         stateid_getter op_get_currentstateid;
1535         stateid_setter op_set_currentstateid;
1536 };
1537
1538 static struct nfsd4_operation nfsd4_ops[];
1539
1540 static const char *nfsd4_op_name(unsigned opnum);
1541
1542 /*
1543  * Enforce NFSv4.1 COMPOUND ordering rules:
1544  *
1545  * Also note, enforced elsewhere:
1546  *      - SEQUENCE other than as first op results in
1547  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1548  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1549  *        (Enforced in nfsd4_bind_conn_to_session().)
1550  *      - DESTROY_SESSION must be the final operation in a compound, if
1551  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1552  *        (Enforced in nfsd4_destroy_session().)
1553  */
1554 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1555 {
1556         struct nfsd4_op *op = &args->ops[0];
1557
1558         /* These ordering requirements don't apply to NFSv4.0: */
1559         if (args->minorversion == 0)
1560                 return nfs_ok;
1561         /* This is weird, but OK, not our problem: */
1562         if (args->opcnt == 0)
1563                 return nfs_ok;
1564         if (op->status == nfserr_op_illegal)
1565                 return nfs_ok;
1566         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1567                 return nfserr_op_not_in_session;
1568         if (op->opnum == OP_SEQUENCE)
1569                 return nfs_ok;
1570         if (args->opcnt != 1)
1571                 return nfserr_not_only_op;
1572         return nfs_ok;
1573 }
1574
1575 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1576 {
1577         return &nfsd4_ops[op->opnum];
1578 }
1579
1580 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1581 {
1582         if (op->opnum == OP_ILLEGAL)
1583                 return false;
1584         return OPDESC(op)->op_flags & OP_CACHEME;
1585 }
1586
1587 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1588 {
1589         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1590         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1591         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1592         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1593         struct nfsd4_operation *thisd;
1594         struct nfsd4_operation *nextd;
1595
1596         thisd = OPDESC(this);
1597         /*
1598          * Most ops check wronsec on our own; only the putfh-like ops
1599          * have special rules.
1600          */
1601         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1602                 return false;
1603         /*
1604          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1605          * put-filehandle operation if we're not going to use the
1606          * result:
1607          */
1608         if (argp->opcnt == resp->opcnt)
1609                 return false;
1610         if (next->opnum == OP_ILLEGAL)
1611                 return false;
1612         nextd = OPDESC(next);
1613         /*
1614          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1615          * errors themselves as necessary; others should check for them
1616          * now:
1617          */
1618         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1619 }
1620
1621 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1622                                struct nfsd4_compoundres *resp)
1623 {
1624         struct xdr_stream *xdr = &resp->xdr;
1625         struct xdr_buf *buf = &rqstp->rq_res;
1626         struct kvec *head = buf->head;
1627
1628         xdr->buf = buf;
1629         xdr->iov = head;
1630         xdr->p   = head->iov_base + head->iov_len;
1631         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1632         /* Tail and page_len should be zero at this point: */
1633         buf->len = buf->head[0].iov_len;
1634         xdr->scratch.iov_len = 0;
1635         xdr->page_ptr = buf->pages - 1;
1636         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1637                 - rqstp->rq_auth_slack;
1638 }
1639
1640 /*
1641  * COMPOUND call.
1642  */
1643 static __be32
1644 nfsd4_proc_compound(struct svc_rqst *rqstp,
1645                     struct nfsd4_compoundargs *args,
1646                     struct nfsd4_compoundres *resp)
1647 {
1648         struct nfsd4_op *op;
1649         struct nfsd4_operation *opdesc;
1650         struct nfsd4_compound_state *cstate = &resp->cstate;
1651         struct svc_fh *current_fh = &cstate->current_fh;
1652         struct svc_fh *save_fh = &cstate->save_fh;
1653         __be32          status;
1654
1655         svcxdr_init_encode(rqstp, resp);
1656         resp->tagp = resp->xdr.p;
1657         /* reserve space for: taglen, tag, and opcnt */
1658         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1659         resp->taglen = args->taglen;
1660         resp->tag = args->tag;
1661         resp->rqstp = rqstp;
1662         cstate->minorversion = args->minorversion;
1663         fh_init(current_fh, NFS4_FHSIZE);
1664         fh_init(save_fh, NFS4_FHSIZE);
1665         /*
1666          * Don't use the deferral mechanism for NFSv4; compounds make it
1667          * too hard to avoid non-idempotency problems.
1668          */
1669         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1670
1671         /*
1672          * According to RFC3010, this takes precedence over all other errors.
1673          */
1674         status = nfserr_minor_vers_mismatch;
1675         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1676                 goto out;
1677
1678         status = nfs41_check_op_ordering(args);
1679         if (status) {
1680                 op = &args->ops[0];
1681                 op->status = status;
1682                 goto encode_op;
1683         }
1684
1685         while (!status && resp->opcnt < args->opcnt) {
1686                 op = &args->ops[resp->opcnt++];
1687
1688                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1689                         resp->opcnt, args->opcnt, op->opnum,
1690                         nfsd4_op_name(op->opnum));
1691                 /*
1692                  * The XDR decode routines may have pre-set op->status;
1693                  * for example, if there is a miscellaneous XDR error
1694                  * it will be set to nfserr_bad_xdr.
1695                  */
1696                 if (op->status) {
1697                         if (op->opnum == OP_OPEN)
1698                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1699                         goto encode_op;
1700                 }
1701
1702                 opdesc = OPDESC(op);
1703
1704                 if (!current_fh->fh_dentry) {
1705                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1706                                 op->status = nfserr_nofilehandle;
1707                                 goto encode_op;
1708                         }
1709                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1710                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1711                         op->status = nfserr_moved;
1712                         goto encode_op;
1713                 }
1714
1715                 fh_clear_wcc(current_fh);
1716
1717                 /* If op is non-idempotent */
1718                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1719                         /*
1720                          * Don't execute this op if we couldn't encode a
1721                          * succesful reply:
1722                          */
1723                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1724                         /*
1725                          * Plus if there's another operation, make sure
1726                          * we'll have space to at least encode an error:
1727                          */
1728                         if (resp->opcnt < args->opcnt)
1729                                 plen += COMPOUND_ERR_SLACK_SPACE;
1730                         op->status = nfsd4_check_resp_size(resp, plen);
1731                 }
1732
1733                 if (op->status)
1734                         goto encode_op;
1735
1736                 if (opdesc->op_get_currentstateid)
1737                         opdesc->op_get_currentstateid(cstate, &op->u);
1738                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1739
1740                 if (!op->status) {
1741                         if (opdesc->op_set_currentstateid)
1742                                 opdesc->op_set_currentstateid(cstate, &op->u);
1743
1744                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1745                                 clear_current_stateid(cstate);
1746
1747                         if (need_wrongsec_check(rqstp))
1748                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1749                 }
1750
1751 encode_op:
1752                 /* Only from SEQUENCE */
1753                 if (cstate->status == nfserr_replay_cache) {
1754                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1755                         status = op->status;
1756                         goto out;
1757                 }
1758                 if (op->status == nfserr_replay_me) {
1759                         op->replay = &cstate->replay_owner->so_replay;
1760                         nfsd4_encode_replay(&resp->xdr, op);
1761                         status = op->status = op->replay->rp_status;
1762                 } else {
1763                         nfsd4_encode_operation(resp, op);
1764                         status = op->status;
1765                 }
1766
1767                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1768                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1769                         be32_to_cpu(status));
1770
1771                 nfsd4_cstate_clear_replay(cstate);
1772                 nfsd4_increment_op_stats(op->opnum);
1773         }
1774
1775         cstate->status = status;
1776         fh_put(current_fh);
1777         fh_put(save_fh);
1778         BUG_ON(cstate->replay_owner);
1779 out:
1780         /* Reset deferral mechanism for RPC deferrals */
1781         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1782         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1783         return status;
1784 }
1785
1786 #define op_encode_hdr_size              (2)
1787 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1788 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1789 #define op_encode_change_info_maxsz     (5)
1790 #define nfs4_fattr_bitmap_maxsz         (4)
1791
1792 /* We'll fall back on returning no lockowner if run out of space: */
1793 #define op_encode_lockowner_maxsz       (0)
1794 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1795
1796 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1797
1798 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1799 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1800                                          op_encode_ace_maxsz)
1801
1802 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1803
1804 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1805 {
1806         return (op_encode_hdr_size) * sizeof(__be32);
1807 }
1808
1809 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1810 {
1811         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1812 }
1813
1814 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1815 {
1816         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1817 }
1818
1819 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1820 {
1821         return (op_encode_hdr_size + op_encode_change_info_maxsz
1822                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1823 }
1824
1825 /*
1826  * Note since this is an idempotent operation we won't insist on failing
1827  * the op prematurely if the estimate is too large.  We may turn off splice
1828  * reads unnecessarily.
1829  */
1830 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1831                                       struct nfsd4_op *op)
1832 {
1833         u32 *bmap = op->u.getattr.ga_bmval;
1834         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1835         u32 ret = 0;
1836
1837         if (bmap0 & FATTR4_WORD0_ACL)
1838                 return svc_max_payload(rqstp);
1839         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1840                 return svc_max_payload(rqstp);
1841
1842         if (bmap1 & FATTR4_WORD1_OWNER) {
1843                 ret += IDMAP_NAMESZ + 4;
1844                 bmap1 &= ~FATTR4_WORD1_OWNER;
1845         }
1846         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1847                 ret += IDMAP_NAMESZ + 4;
1848                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1849         }
1850         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1851                 ret += NFS4_FHSIZE + 4;
1852                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1853         }
1854         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1855                 ret += NFS4_MAXLABELLEN + 12;
1856                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1857         }
1858         /*
1859          * Largest of remaining attributes are 16 bytes (e.g.,
1860          * supported_attributes)
1861          */
1862         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1863         /* bitmask, length */
1864         ret += 20;
1865         return ret;
1866 }
1867
1868 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1869 {
1870         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1871                 * sizeof(__be32);
1872 }
1873
1874 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1875 {
1876         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1877                 * sizeof(__be32);
1878 }
1879
1880 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1881 {
1882         return (op_encode_hdr_size + op_encode_stateid_maxsz
1883                 + op_encode_change_info_maxsz + 1
1884                 + nfs4_fattr_bitmap_maxsz
1885                 + op_encode_delegation_maxsz) * sizeof(__be32);
1886 }
1887
1888 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1889 {
1890         u32 maxcount = 0, rlen = 0;
1891
1892         maxcount = svc_max_payload(rqstp);
1893         rlen = min(op->u.read.rd_length, maxcount);
1894
1895         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1896 }
1897
1898 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1899 {
1900         u32 maxcount = 0, rlen = 0;
1901
1902         maxcount = svc_max_payload(rqstp);
1903         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1904
1905         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1906                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1907 }
1908
1909 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1910 {
1911         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1912                 * sizeof(__be32);
1913 }
1914
1915 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1916 {
1917         return (op_encode_hdr_size + op_encode_change_info_maxsz
1918                 + op_encode_change_info_maxsz) * sizeof(__be32);
1919 }
1920
1921 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1922                                        struct nfsd4_op *op)
1923 {
1924         return (op_encode_hdr_size
1925                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1926 }
1927
1928 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1929 {
1930         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1931 }
1932
1933 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1934 {
1935         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1936                                                                 sizeof(__be32);
1937 }
1938
1939 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1940 {
1941         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1942 }
1943
1944 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1945 {
1946         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1947                 1 + 1 + /* eir_flags, spr_how */\
1948                 4 + /* spo_must_enforce & _allow with bitmap */\
1949                 2 + /*eir_server_owner.so_minor_id */\
1950                 /* eir_server_owner.so_major_id<> */\
1951                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1952                 /* eir_server_scope<> */\
1953                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1954                 1 + /* eir_server_impl_id array length */\
1955                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1956 }
1957
1958 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1959 {
1960         return (op_encode_hdr_size + \
1961                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1962                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1963 }
1964
1965 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1966 {
1967         return (op_encode_hdr_size + \
1968                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1969                 2 + /* csr_sequence, csr_flags */\
1970                 op_encode_channel_attrs_maxsz + \
1971                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1972 }
1973
1974 #ifdef CONFIG_NFSD_PNFS
1975 /*
1976  * At this stage we don't really know what layout driver will handle the request,
1977  * so we need to define an arbitrary upper bound here.
1978  */
1979 #define MAX_LAYOUT_SIZE         128
1980 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1981 {
1982         return (op_encode_hdr_size +
1983                 1 /* logr_return_on_close */ +
1984                 op_encode_stateid_maxsz +
1985                 1 /* nr of layouts */ +
1986                 MAX_LAYOUT_SIZE) * sizeof(__be32);
1987 }
1988
1989 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1990 {
1991         return (op_encode_hdr_size +
1992                 1 /* locr_newsize */ +
1993                 2 /* ns_size */) * sizeof(__be32);
1994 }
1995
1996 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1997 {
1998         return (op_encode_hdr_size +
1999                 1 /* lrs_stateid */ +
2000                 op_encode_stateid_maxsz) * sizeof(__be32);
2001 }
2002 #endif /* CONFIG_NFSD_PNFS */
2003
2004 static struct nfsd4_operation nfsd4_ops[] = {
2005         [OP_ACCESS] = {
2006                 .op_func = (nfsd4op_func)nfsd4_access,
2007                 .op_name = "OP_ACCESS",
2008         },
2009         [OP_CLOSE] = {
2010                 .op_func = (nfsd4op_func)nfsd4_close,
2011                 .op_flags = OP_MODIFIES_SOMETHING,
2012                 .op_name = "OP_CLOSE",
2013                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2014                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
2015                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
2016         },
2017         [OP_COMMIT] = {
2018                 .op_func = (nfsd4op_func)nfsd4_commit,
2019                 .op_flags = OP_MODIFIES_SOMETHING,
2020                 .op_name = "OP_COMMIT",
2021                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
2022         },
2023         [OP_CREATE] = {
2024                 .op_func = (nfsd4op_func)nfsd4_create,
2025                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2026                 .op_name = "OP_CREATE",
2027                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
2028         },
2029         [OP_DELEGRETURN] = {
2030                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
2031                 .op_flags = OP_MODIFIES_SOMETHING,
2032                 .op_name = "OP_DELEGRETURN",
2033                 .op_rsize_bop = nfsd4_only_status_rsize,
2034                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
2035         },
2036         [OP_GETATTR] = {
2037                 .op_func = (nfsd4op_func)nfsd4_getattr,
2038                 .op_flags = ALLOWED_ON_ABSENT_FS,
2039                 .op_rsize_bop = nfsd4_getattr_rsize,
2040                 .op_name = "OP_GETATTR",
2041         },
2042         [OP_GETFH] = {
2043                 .op_func = (nfsd4op_func)nfsd4_getfh,
2044                 .op_name = "OP_GETFH",
2045         },
2046         [OP_LINK] = {
2047                 .op_func = (nfsd4op_func)nfsd4_link,
2048                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2049                                 | OP_CACHEME,
2050                 .op_name = "OP_LINK",
2051                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2052         },
2053         [OP_LOCK] = {
2054                 .op_func = (nfsd4op_func)nfsd4_lock,
2055                 .op_flags = OP_MODIFIES_SOMETHING,
2056                 .op_name = "OP_LOCK",
2057                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2058                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2059         },
2060         [OP_LOCKT] = {
2061                 .op_func = (nfsd4op_func)nfsd4_lockt,
2062                 .op_name = "OP_LOCKT",
2063         },
2064         [OP_LOCKU] = {
2065                 .op_func = (nfsd4op_func)nfsd4_locku,
2066                 .op_flags = OP_MODIFIES_SOMETHING,
2067                 .op_name = "OP_LOCKU",
2068                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2069                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2070         },
2071         [OP_LOOKUP] = {
2072                 .op_func = (nfsd4op_func)nfsd4_lookup,
2073                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2074                 .op_name = "OP_LOOKUP",
2075         },
2076         [OP_LOOKUPP] = {
2077                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2078                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2079                 .op_name = "OP_LOOKUPP",
2080         },
2081         [OP_NVERIFY] = {
2082                 .op_func = (nfsd4op_func)nfsd4_nverify,
2083                 .op_name = "OP_NVERIFY",
2084         },
2085         [OP_OPEN] = {
2086                 .op_func = (nfsd4op_func)nfsd4_open,
2087                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2088                 .op_name = "OP_OPEN",
2089                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2090                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2091         },
2092         [OP_OPEN_CONFIRM] = {
2093                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2094                 .op_flags = OP_MODIFIES_SOMETHING,
2095                 .op_name = "OP_OPEN_CONFIRM",
2096                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2097         },
2098         [OP_OPEN_DOWNGRADE] = {
2099                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2100                 .op_flags = OP_MODIFIES_SOMETHING,
2101                 .op_name = "OP_OPEN_DOWNGRADE",
2102                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2103                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2104                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2105         },
2106         [OP_PUTFH] = {
2107                 .op_func = (nfsd4op_func)nfsd4_putfh,
2108                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2109                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2110                 .op_name = "OP_PUTFH",
2111                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2112         },
2113         [OP_PUTPUBFH] = {
2114                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2115                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2116                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2117                 .op_name = "OP_PUTPUBFH",
2118                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2119         },
2120         [OP_PUTROOTFH] = {
2121                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2122                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2123                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2124                 .op_name = "OP_PUTROOTFH",
2125                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2126         },
2127         [OP_READ] = {
2128                 .op_func = (nfsd4op_func)nfsd4_read,
2129                 .op_name = "OP_READ",
2130                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2131                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2132         },
2133         [OP_READDIR] = {
2134                 .op_func = (nfsd4op_func)nfsd4_readdir,
2135                 .op_name = "OP_READDIR",
2136                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2137         },
2138         [OP_READLINK] = {
2139                 .op_func = (nfsd4op_func)nfsd4_readlink,
2140                 .op_name = "OP_READLINK",
2141         },
2142         [OP_REMOVE] = {
2143                 .op_func = (nfsd4op_func)nfsd4_remove,
2144                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2145                 .op_name = "OP_REMOVE",
2146                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2147         },
2148         [OP_RENAME] = {
2149                 .op_func = (nfsd4op_func)nfsd4_rename,
2150                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2151                 .op_name = "OP_RENAME",
2152                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2153         },
2154         [OP_RENEW] = {
2155                 .op_func = (nfsd4op_func)nfsd4_renew,
2156                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2157                                 | OP_MODIFIES_SOMETHING,
2158                 .op_name = "OP_RENEW",
2159                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2160
2161         },
2162         [OP_RESTOREFH] = {
2163                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2164                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2165                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2166                 .op_name = "OP_RESTOREFH",
2167                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2168         },
2169         [OP_SAVEFH] = {
2170                 .op_func = (nfsd4op_func)nfsd4_savefh,
2171                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2172                 .op_name = "OP_SAVEFH",
2173                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2174         },
2175         [OP_SECINFO] = {
2176                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2177                 .op_flags = OP_HANDLES_WRONGSEC,
2178                 .op_name = "OP_SECINFO",
2179         },
2180         [OP_SETATTR] = {
2181                 .op_func = (nfsd4op_func)nfsd4_setattr,
2182                 .op_name = "OP_SETATTR",
2183                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2184                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2185                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2186         },
2187         [OP_SETCLIENTID] = {
2188                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2189                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2190                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2191                 .op_name = "OP_SETCLIENTID",
2192                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2193         },
2194         [OP_SETCLIENTID_CONFIRM] = {
2195                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2196                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2197                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2198                 .op_name = "OP_SETCLIENTID_CONFIRM",
2199                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2200         },
2201         [OP_VERIFY] = {
2202                 .op_func = (nfsd4op_func)nfsd4_verify,
2203                 .op_name = "OP_VERIFY",
2204         },
2205         [OP_WRITE] = {
2206                 .op_func = (nfsd4op_func)nfsd4_write,
2207                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2208                 .op_name = "OP_WRITE",
2209                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2210                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2211         },
2212         [OP_RELEASE_LOCKOWNER] = {
2213                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2214                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2215                                 | OP_MODIFIES_SOMETHING,
2216                 .op_name = "OP_RELEASE_LOCKOWNER",
2217                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2218         },
2219
2220         /* NFSv4.1 operations */
2221         [OP_EXCHANGE_ID] = {
2222                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2223                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2224                                 | OP_MODIFIES_SOMETHING,
2225                 .op_name = "OP_EXCHANGE_ID",
2226                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2227         },
2228         [OP_BACKCHANNEL_CTL] = {
2229                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2230                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2231                 .op_name = "OP_BACKCHANNEL_CTL",
2232                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2233         },
2234         [OP_BIND_CONN_TO_SESSION] = {
2235                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2236                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2237                                 | OP_MODIFIES_SOMETHING,
2238                 .op_name = "OP_BIND_CONN_TO_SESSION",
2239                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2240         },
2241         [OP_CREATE_SESSION] = {
2242                 .op_func = (nfsd4op_func)nfsd4_create_session,
2243                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2244                                 | OP_MODIFIES_SOMETHING,
2245                 .op_name = "OP_CREATE_SESSION",
2246                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2247         },
2248         [OP_DESTROY_SESSION] = {
2249                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2250                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2251                                 | OP_MODIFIES_SOMETHING,
2252                 .op_name = "OP_DESTROY_SESSION",
2253                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2254         },
2255         [OP_SEQUENCE] = {
2256                 .op_func = (nfsd4op_func)nfsd4_sequence,
2257                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2258                 .op_name = "OP_SEQUENCE",
2259                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2260         },
2261         [OP_DESTROY_CLIENTID] = {
2262                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2263                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2264                                 | OP_MODIFIES_SOMETHING,
2265                 .op_name = "OP_DESTROY_CLIENTID",
2266                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2267         },
2268         [OP_RECLAIM_COMPLETE] = {
2269                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2270                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2271                 .op_name = "OP_RECLAIM_COMPLETE",
2272                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2273         },
2274         [OP_SECINFO_NO_NAME] = {
2275                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2276                 .op_flags = OP_HANDLES_WRONGSEC,
2277                 .op_name = "OP_SECINFO_NO_NAME",
2278         },
2279         [OP_TEST_STATEID] = {
2280                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2281                 .op_flags = ALLOWED_WITHOUT_FH,
2282                 .op_name = "OP_TEST_STATEID",
2283         },
2284         [OP_FREE_STATEID] = {
2285                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2286                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2287                 .op_name = "OP_FREE_STATEID",
2288                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2289                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2290         },
2291 #ifdef CONFIG_NFSD_PNFS
2292         [OP_GETDEVICEINFO] = {
2293                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2294                 .op_flags = ALLOWED_WITHOUT_FH,
2295                 .op_name = "OP_GETDEVICEINFO",
2296         },
2297         [OP_LAYOUTGET] = {
2298                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2299                 .op_flags = OP_MODIFIES_SOMETHING,
2300                 .op_name = "OP_LAYOUTGET",
2301                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2302         },
2303         [OP_LAYOUTCOMMIT] = {
2304                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2305                 .op_flags = OP_MODIFIES_SOMETHING,
2306                 .op_name = "OP_LAYOUTCOMMIT",
2307                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2308         },
2309         [OP_LAYOUTRETURN] = {
2310                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2311                 .op_flags = OP_MODIFIES_SOMETHING,
2312                 .op_name = "OP_LAYOUTRETURN",
2313                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2314         },
2315 #endif /* CONFIG_NFSD_PNFS */
2316
2317         /* NFSv4.2 operations */
2318         [OP_ALLOCATE] = {
2319                 .op_func = (nfsd4op_func)nfsd4_allocate,
2320                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2321                 .op_name = "OP_ALLOCATE",
2322                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2323         },
2324         [OP_DEALLOCATE] = {
2325                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2326                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2327                 .op_name = "OP_DEALLOCATE",
2328                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2329         },
2330         [OP_CLONE] = {
2331                 .op_func = (nfsd4op_func)nfsd4_clone,
2332                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2333                 .op_name = "OP_CLONE",
2334                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2335         },
2336         [OP_SEEK] = {
2337                 .op_func = (nfsd4op_func)nfsd4_seek,
2338                 .op_name = "OP_SEEK",
2339         },
2340 };
2341
2342 /**
2343  * nfsd4_spo_must_allow - Determine if the compound op contains an
2344  * operation that is allowed to be sent with machine credentials
2345  *
2346  * @rqstp: a pointer to the struct svc_rqst
2347  *
2348  * Checks to see if the compound contains a spo_must_allow op
2349  * and confirms that it was sent with the proper machine creds.
2350  */
2351
2352 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2353 {
2354         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2355         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2356         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2357         struct nfsd4_compound_state *cstate = &resp->cstate;
2358         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2359         u32 opiter;
2360
2361         if (!cstate->minorversion)
2362                 return false;
2363
2364         if (cstate->spo_must_allowed == true)
2365                 return true;
2366
2367         opiter = resp->opcnt;
2368         while (opiter < argp->opcnt) {
2369                 this = &argp->ops[opiter++];
2370                 if (test_bit(this->opnum, allow->u.longs) &&
2371                         cstate->clp->cl_mach_cred &&
2372                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2373                         cstate->spo_must_allowed = true;
2374                         return true;
2375                 }
2376         }
2377         cstate->spo_must_allowed = false;
2378         return false;
2379 }
2380
2381 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2382 {
2383         struct nfsd4_operation *opdesc;
2384         nfsd4op_rsize estimator;
2385
2386         if (op->opnum == OP_ILLEGAL)
2387                 return op_encode_hdr_size * sizeof(__be32);
2388         opdesc = OPDESC(op);
2389         estimator = opdesc->op_rsize_bop;
2390         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2391 }
2392
2393 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2394 {
2395         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2396                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2397                         op->opnum, nfsd4_op_name(op->opnum));
2398                 WARN_ON_ONCE(1);
2399         }
2400 }
2401
2402 static const char *nfsd4_op_name(unsigned opnum)
2403 {
2404         if (opnum < ARRAY_SIZE(nfsd4_ops))
2405                 return nfsd4_ops[opnum].op_name;
2406         return "unknown_operation";
2407 }
2408
2409 #define nfsd4_voidres                   nfsd4_voidargs
2410 struct nfsd4_voidargs { int dummy; };
2411
2412 static struct svc_procedure             nfsd_procedures4[2] = {
2413         [NFSPROC4_NULL] = {
2414                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2415                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2416                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2417                 .pc_ressize = sizeof(struct nfsd4_voidres),
2418                 .pc_cachetype = RC_NOCACHE,
2419                 .pc_xdrressize = 1,
2420         },
2421         [NFSPROC4_COMPOUND] = {
2422                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2423                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2424                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2425                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2426                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2427                 .pc_release = nfsd4_release_compoundargs,
2428                 .pc_cachetype = RC_NOCACHE,
2429                 .pc_xdrressize = NFSD_BUFSIZE/4,
2430         },
2431 };
2432
2433 struct svc_version      nfsd_version4 = {
2434                 .vs_vers        = 4,
2435                 .vs_nproc       = 2,
2436                 .vs_proc        = nfsd_procedures4,
2437                 .vs_dispatch    = nfsd_dispatch,
2438                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2439                 .vs_rpcb_optnl  = 1,
2440 };
2441
2442 /*
2443  * Local variables:
2444  *  c-basic-offset: 8
2445  * End:
2446  */