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 <[email protected]>
   8  *  Andy Adamson   <[email protected]>
   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         struct svc_export *exp = cstate->current_fh.fh_export;
  99
 100         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
 101                 return nfserr_attrnotsupp;
 102         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
 103                 return nfserr_attrnotsupp;
 104         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
 105                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
 106                 return nfserr_attrnotsupp;
 107         if (writable && !bmval_is_subset(bmval, writable))
 108                 return nfserr_inval;
 109         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
 110                         (bmval[1] & FATTR4_WORD1_MODE))
 111                 return nfserr_inval;
 112         return nfs_ok;
 113 }
 114
 115 static __be32
 116 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
 117         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 118 {
 119         __be32 status = nfs_ok;
 120
 121         if (open->op_create == NFS4_OPEN_CREATE) {
 122                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
 123                     || open->op_createmode == NFS4_CREATE_GUARDED)
 124                         status = check_attr_support(rqstp, cstate,
 125                                         open->op_bmval, nfsd_attrmask);
 126                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
 127                         status = check_attr_support(rqstp, cstate,
 128                                         open->op_bmval, nfsd41_ex_attrmask);
 129         }
 130
 131         return status;
 132 }
 133
 134 static int
 135 is_create_with_attrs(struct nfsd4_open *open)
 136 {
 137         return open->op_create == NFS4_OPEN_CREATE
 138                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
 139                     || open->op_createmode == NFS4_CREATE_GUARDED
 140                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
 141 }
 142
 143 /*
 144  * if error occurs when setting the acl, just clear the acl bit
 145  * in the returned attr bitmap.
 146  */
 147 static void
 148 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
 149                 struct nfs4_acl *acl, u32 *bmval)
 150 {
 151         __be32 status;
 152
 153         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
 154         if (status)
 155                 /*
 156                  * We should probably fail the whole open at this point,
 157                  * but we've already created the file, so it's too late;
 158                  * So this seems the least of evils:
 159                  */
 160                 bmval[0] &= ~FATTR4_WORD0_ACL;
 161 }
 162
 163 static inline void
 164 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 165 {
 166         fh_put(dst);
 167         dget(src->fh_dentry);
 168         if (src->fh_export)
 169                 exp_get(src->fh_export);
 170         *dst = *src;
 171 }
 172
 173 static __be32
 174 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
 175 {
 176         __be32 status;
 177
 178         if (open->op_truncate &&
 179                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
 180                 return nfserr_inval;
 181
 182         accmode |= NFSD_MAY_READ_IF_EXEC;
 183
 184         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
 185                 accmode |= NFSD_MAY_READ;
 186         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
 187                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
 188         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
 189                 accmode |= NFSD_MAY_WRITE;
 190
 191         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
 192
 193         return status;
 194 }
 195
 196 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
 197 {
 198         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
 199
 200         if (S_ISREG(mode))
 201                 return nfs_ok;
 202         if (S_ISDIR(mode))
 203                 return nfserr_isdir;
 204         /*
 205          * Using err_symlink as our catch-all case may look odd; but
 206          * there's no other obvious error for this case in 4.0, and we
 207          * happen to know that it will cause the linux v4 client to do
 208          * the right thing on attempts to open something other than a
 209          * regular file.
 210          */
 211         return nfserr_symlink;
 212 }
 213
 214 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
 215 {
 216         if (nfsd4_has_session(cstate))
 217                 return;
 218         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
 219                         &resfh->fh_handle);
 220 }
 221
 222 static __be32
 223 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
 224 {
 225         struct svc_fh *current_fh = &cstate->current_fh;
 226         int accmode;
 227         __be32 status;
 228
 229         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
 230         if (!*resfh)
 231                 return nfserr_jukebox;
 232         fh_init(*resfh, NFS4_FHSIZE);
 233         open->op_truncate = 0;
 234
 235         if (open->op_create) {
 236                 /* FIXME: check session persistence and pnfs flags.
 237                  * The nfsv4.1 spec requires the following semantics:
 238                  *
 239                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
 240                  * Reply Cache  | server |                 |
 241                  * -------------+--------+-----------------+--------------------
 242                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
 243                  *              |        |                 | (SHOULD)
 244                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
 245                  *              |        |                 | (SHOULD NOT)
 246                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
 247                  * yes          | no     | GUARDED4        | GUARDED4
 248                  * yes          | yes    | GUARDED4        | GUARDED4
 249                  */
 250
 251                 /*
 252                  * Note: create modes (UNCHECKED,GUARDED...) are the same
 253                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
 254                  */
 255                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
 256                                         open->op_fname.len, &open->op_iattr,
 257                                         *resfh, open->op_createmode,
 258                                         (u32 *)open->op_verf.data,
 259                                         &open->op_truncate, &open->op_created);
 260
 261                 if (!status && open->op_label.len)
 262                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
 263
 264                 /*
 265                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
 266                  * use the returned bitmask to indicate which attributes
 267                  * we used to store the verifier:
 268                  */
 269                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
 270                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
 271                                                 FATTR4_WORD1_TIME_MODIFY);
 272         } else
 273                 /*
 274                  * Note this may exit with the parent still locked.
 275                  * We will hold the lock until nfsd4_open's final
 276                  * lookup, to prevent renames or unlinks until we've had
 277                  * a chance to an acquire a delegation if appropriate.
 278                  */
 279                 status = nfsd_lookup(rqstp, current_fh,
 280                                      open->op_fname.data, open->op_fname.len, *resfh);
 281         if (status)
 282                 goto out;
 283         status = nfsd_check_obj_isreg(*resfh);
 284         if (status)
 285                 goto out;
 286
 287         if (is_create_with_attrs(open) && open->op_acl != NULL)
 288                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
 289
 290         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
 291         accmode = NFSD_MAY_NOP;
 292         if (open->op_created ||
 293                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
 294                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
 295         status = do_open_permission(rqstp, *resfh, open, accmode);
 296         set_change_info(&open->op_cinfo, current_fh);
 297 out:
 298         return status;
 299 }
 300
 301 static __be32
 302 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
 303 {
 304         struct svc_fh *current_fh = &cstate->current_fh;
 305         __be32 status;
 306         int accmode = 0;
 307
 308         /* We don't know the target directory, and therefore can not
 309         * set the change info
 310         */
 311
 312         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
 313
 314         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
 315
 316         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
 317                 (open->op_iattr.ia_size == 0);
 318         /*
 319          * In the delegation case, the client is telling us about an
 320          * open that it *already* performed locally, some time ago.  We
 321          * should let it succeed now if possible.
 322          *
 323          * In the case of a CLAIM_FH open, on the other hand, the client
 324          * may be counting on us to enforce permissions (the Linux 4.1
 325          * client uses this for normal opens, for example).
 326          */
 327         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
 328                 accmode = NFSD_MAY_OWNER_OVERRIDE;
 329
 330         status = do_open_permission(rqstp, current_fh, open, accmode);
 331
 332         return status;
 333 }
 334
 335 static void
 336 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
 337 {
 338         struct nfsd4_sessionid *sid =
 339                         (struct nfsd4_sessionid *)session->se_sessionid.data;
 340
 341         clid->cl_boot = sid->clientid.cl_boot;
 342         clid->cl_id = sid->clientid.cl_id;
 343 }
 344
 345 static __be32
 346 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 347            union nfsd4_op_u *u)
 348 {
 349         struct nfsd4_open *open = &u->open;
 350         __be32 status;
 351         struct svc_fh *resfh = NULL;
 352         struct net *net = SVC_NET(rqstp);
 353         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 354
 355         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
 356                 (int)open->op_fname.len, open->op_fname.data,
 357                 open->op_openowner);
 358
 359         /* This check required by spec. */
 360         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 361                 return nfserr_inval;
 362
 363         open->op_created = 0;
 364         /*
 365          * RFC5661 18.51.3
 366          * Before RECLAIM_COMPLETE done, server should deny new lock
 367          */
 368         if (nfsd4_has_session(cstate) &&
 369             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
 370                       &cstate->session->se_client->cl_flags) &&
 371             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 372                 return nfserr_grace;
 373
 374         if (nfsd4_has_session(cstate))
 375                 copy_clientid(&open->op_clientid, cstate->session);
 376
 377         /* check seqid for replay. set nfs4_owner */
 378         status = nfsd4_process_open1(cstate, open, nn);
 379         if (status == nfserr_replay_me) {
 380                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
 381                 fh_put(&cstate->current_fh);
 382                 fh_copy_shallow(&cstate->current_fh.fh_handle,
 383                                 &rp->rp_openfh);
 384                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 385                 if (status)
 386                         dprintk("nfsd4_open: replay failed"
 387                                 " restoring previous filehandle\n");
 388                 else
 389                         status = nfserr_replay_me;
 390         }
 391         if (status)
 392                 goto out;
 393         if (open->op_xdr_error) {
 394                 status = open->op_xdr_error;
 395                 goto out;
 396         }
 397
 398         status = nfsd4_check_open_attributes(rqstp, cstate, open);
 399         if (status)
 400                 goto out;
 401
 402         /* Openowner is now set, so sequence id will get bumped.  Now we need
 403          * these checks before we do any creates: */
 404         status = nfserr_grace;
 405         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
 406                 goto out;
 407         status = nfserr_no_grace;
 408         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
 409                 goto out;
 410
 411         switch (open->op_claim_type) {
 412                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 413                 case NFS4_OPEN_CLAIM_NULL:
 414                         status = do_open_lookup(rqstp, cstate, open, &resfh);
 415                         if (status)
 416                                 goto out;
 417                         break;
 418                 case NFS4_OPEN_CLAIM_PREVIOUS:
 419                         status = nfs4_check_open_reclaim(&open->op_clientid,
 420                                                          cstate, nn);
 421                         if (status)
 422                                 goto out;
 423                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
 424                 case NFS4_OPEN_CLAIM_FH:
 425                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 426                         status = do_open_fhandle(rqstp, cstate, open);
 427                         if (status)
 428                                 goto out;
 429                         resfh = &cstate->current_fh;
 430                         break;
 431                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 432                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 433                         dprintk("NFSD: unsupported OPEN claim type %d\n",
 434                                 open->op_claim_type);
 435                         status = nfserr_notsupp;
 436                         goto out;
 437                 default:
 438                         dprintk("NFSD: Invalid OPEN claim type %d\n",
 439                                 open->op_claim_type);
 440                         status = nfserr_inval;
 441                         goto out;
 442         }
 443         /*
 444          * nfsd4_process_open2() does the actual opening of the file.  If
 445          * successful, it (1) truncates the file if open->op_truncate was
 446          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
 447          */
 448         status = nfsd4_process_open2(rqstp, resfh, open);
 449         WARN(status && open->op_created,
 450              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
 451              be32_to_cpu(status));
 452 out:
 453         if (resfh && resfh != &cstate->current_fh) {
 454                 fh_dup2(&cstate->current_fh, resfh);
 455                 fh_put(resfh);
 456                 kfree(resfh);
 457         }
 458         nfsd4_cleanup_open_state(cstate, open);
 459         nfsd4_bump_seqid(cstate, status);
 460         return status;
 461 }
 462
 463 /*
 464  * OPEN is the only seqid-mutating operation whose decoding can fail
 465  * with a seqid-mutating error (specifically, decoding of user names in
 466  * the attributes).  Therefore we have to do some processing to look up
 467  * the stateowner so that we can bump the seqid.
 468  */
 469 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
 470 {
 471         struct nfsd4_open *open = &op->u.open;
 472
 473         if (!seqid_mutating_err(ntohl(op->status)))
 474                 return op->status;
 475         if (nfsd4_has_session(cstate))
 476                 return op->status;
 477         open->op_xdr_error = op->status;
 478         return nfsd4_open(rqstp, cstate, &op->u);
 479 }
 480
 481 /*
 482  * filehandle-manipulating ops.
 483  */
 484 static __be32
 485 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 486             union nfsd4_op_u *u)
 487 {
 488         if (!cstate->current_fh.fh_dentry)
 489                 return nfserr_nofilehandle;
 490
 491         u->getfh = &cstate->current_fh;
 492         return nfs_ok;
 493 }
 494
 495 static __be32
 496 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 497             union nfsd4_op_u *u)
 498 {
 499         struct nfsd4_putfh *putfh = &u->putfh;
 500
 501         fh_put(&cstate->current_fh);
 502         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
 503         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
 504                putfh->pf_fhlen);
 505         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
 506 }
 507
 508 static __be32
 509 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 510                 union nfsd4_op_u *u)
 511 {
 512         __be32 status;
 513
 514         fh_put(&cstate->current_fh);
 515         status = exp_pseudoroot(rqstp, &cstate->current_fh);
 516         return status;
 517 }
 518
 519 static __be32
 520 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 521                 union nfsd4_op_u *u)
 522 {
 523         if (!cstate->save_fh.fh_dentry)
 524                 return nfserr_restorefh;
 525
 526         fh_dup2(&cstate->current_fh, &cstate->save_fh);
 527         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
 528                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
 529                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
 530         }
 531         return nfs_ok;
 532 }
 533
 534 static __be32
 535 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 536              union nfsd4_op_u *u)
 537 {
 538         if (!cstate->current_fh.fh_dentry)
 539                 return nfserr_nofilehandle;
 540
 541         fh_dup2(&cstate->save_fh, &cstate->current_fh);
 542         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
 543                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
 544                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
 545         }
 546         return nfs_ok;
 547 }
 548
 549 /*
 550  * misc nfsv4 ops
 551  */
 552 static __be32
 553 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 554              union nfsd4_op_u *u)
 555 {
 556         struct nfsd4_access *access = &u->access;
 557
 558         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
 559                 return nfserr_inval;
 560
 561         access->ac_resp_access = access->ac_req_access;
 562         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
 563                            &access->ac_supported);
 564 }
 565
 566 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
 567 {
 568         __be32 verf[2];
 569         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 570
 571         /*
 572          * This is opaque to client, so no need to byte-swap. Use
 573          * __force to keep sparse happy
 574          */
 575         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
 576         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
 577         memcpy(verifier->data, verf, sizeof(verifier->data));
 578 }
 579
 580 static __be32
 581 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 582              union nfsd4_op_u *u)
 583 {
 584         struct nfsd4_commit *commit = &u->commit;
 585
 586         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
 587         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
 588                              commit->co_count);
 589 }
 590
 591 static __be32
 592 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 593              union nfsd4_op_u *u)
 594 {
 595         struct nfsd4_create *create = &u->create;
 596         struct svc_fh resfh;
 597         __be32 status;
 598         dev_t rdev;
 599
 600         fh_init(&resfh, NFS4_FHSIZE);
 601
 602         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
 603         if (status)
 604                 return status;
 605
 606         status = check_attr_support(rqstp, cstate, create->cr_bmval,
 607                                     nfsd_attrmask);
 608         if (status)
 609                 return status;
 610
 611         switch (create->cr_type) {
 612         case NF4LNK:
 613                 status = nfsd_symlink(rqstp, &cstate->current_fh,
 614                                       create->cr_name, create->cr_namelen,
 615                                       create->cr_data, &resfh);
 616                 break;
 617
 618         case NF4BLK:
 619                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 620                 if (MAJOR(rdev) != create->cr_specdata1 ||
 621                     MINOR(rdev) != create->cr_specdata2)
 622                         return nfserr_inval;
 623                 status = nfsd_create(rqstp, &cstate->current_fh,
 624                                      create->cr_name, create->cr_namelen,
 625                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
 626                 break;
 627
 628         case NF4CHR:
 629                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
 630                 if (MAJOR(rdev) != create->cr_specdata1 ||
 631                     MINOR(rdev) != create->cr_specdata2)
 632                         return nfserr_inval;
 633                 status = nfsd_create(rqstp, &cstate->current_fh,
 634                                      create->cr_name, create->cr_namelen,
 635                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
 636                 break;
 637
 638         case NF4SOCK:
 639                 status = nfsd_create(rqstp, &cstate->current_fh,
 640                                      create->cr_name, create->cr_namelen,
 641                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
 642                 break;
 643
 644         case NF4FIFO:
 645                 status = nfsd_create(rqstp, &cstate->current_fh,
 646                                      create->cr_name, create->cr_namelen,
 647                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
 648                 break;
 649
 650         case NF4DIR:
 651                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
 652                 status = nfsd_create(rqstp, &cstate->current_fh,
 653                                      create->cr_name, create->cr_namelen,
 654                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
 655                 break;
 656
 657         default:
 658                 status = nfserr_badtype;
 659         }
 660
 661         if (status)
 662                 goto out;
 663
 664         if (create->cr_label.len)
 665                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
 666
 667         if (create->cr_acl != NULL)
 668                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
 669                                 create->cr_bmval);
 670
 671         fh_unlock(&cstate->current_fh);
 672         set_change_info(&create->cr_cinfo, &cstate->current_fh);
 673         fh_dup2(&cstate->current_fh, &resfh);
 674 out:
 675         fh_put(&resfh);
 676         return status;
 677 }
 678
 679 static __be32
 680 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 681               union nfsd4_op_u *u)
 682 {
 683         struct nfsd4_getattr *getattr = &u->getattr;
 684         __be32 status;
 685
 686         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
 687         if (status)
 688                 return status;
 689
 690         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 691                 return nfserr_inval;
 692
 693         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 694         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 695         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 696
 697         getattr->ga_fhp = &cstate->current_fh;
 698         return nfs_ok;
 699 }
 700
 701 static __be32
 702 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 703            union nfsd4_op_u *u)
 704 {
 705         struct nfsd4_link *link = &u->link;
 706         __be32 status = nfserr_nofilehandle;
 707
 708         if (!cstate->save_fh.fh_dentry)
 709                 return status;
 710         status = nfsd_link(rqstp, &cstate->current_fh,
 711                            link->li_name, link->li_namelen, &cstate->save_fh);
 712         if (!status)
 713                 set_change_info(&link->li_cinfo, &cstate->current_fh);
 714         return status;
 715 }
 716
 717 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
 718 {
 719         struct svc_fh tmp_fh;
 720         __be32 ret;
 721
 722         fh_init(&tmp_fh, NFS4_FHSIZE);
 723         ret = exp_pseudoroot(rqstp, &tmp_fh);
 724         if (ret)
 725                 return ret;
 726         if (tmp_fh.fh_dentry == fh->fh_dentry) {
 727                 fh_put(&tmp_fh);
 728                 return nfserr_noent;
 729         }
 730         fh_put(&tmp_fh);
 731         return nfsd_lookup(rqstp, fh, "..", 2, fh);
 732 }
 733
 734 static __be32
 735 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 736               union nfsd4_op_u *u)
 737 {
 738         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 739 }
 740
 741 static __be32
 742 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 743              union nfsd4_op_u *u)
 744 {
 745         return nfsd_lookup(rqstp, &cstate->current_fh,
 746                            u->lookup.lo_name, u->lookup.lo_len,
 747                            &cstate->current_fh);
 748 }
 749
 750 static __be32
 751 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 752            union nfsd4_op_u *u)
 753 {
 754         struct nfsd4_read *read = &u->read;
 755         __be32 status;
 756
 757         read->rd_filp = NULL;
 758         if (read->rd_offset >= OFFSET_MAX)
 759                 return nfserr_inval;
 760
 761         /*
 762          * If we do a zero copy read, then a client will see read data
 763          * that reflects the state of the file *after* performing the
 764          * following compound.
 765          *
 766          * To ensure proper ordering, we therefore turn off zero copy if
 767          * the client wants us to do more in this compound:
 768          */
 769         if (!nfsd4_last_compound_op(rqstp))
 770                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 771
 772         /* check stateid */
 773         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
 774                                         &read->rd_stateid, RD_STATE,
 775                                         &read->rd_filp, &read->rd_tmp_file);
 776         if (status) {
 777                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
 778                 goto out;
 779         }
 780         status = nfs_ok;
 781 out:
 782         read->rd_rqstp = rqstp;
 783         read->rd_fhp = &cstate->current_fh;
 784         return status;
 785 }
 786
 787
 788 static void
 789 nfsd4_read_release(union nfsd4_op_u *u)
 790 {
 791         if (u->read.rd_filp)
 792                 fput(u->read.rd_filp);
 793 }
 794
 795 static __be32
 796 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 797               union nfsd4_op_u *u)
 798 {
 799         struct nfsd4_readdir *readdir = &u->readdir;
 800         u64 cookie = readdir->rd_cookie;
 801         static const nfs4_verifier zeroverf;
 802
 803         /* no need to check permission - this will be done in nfsd_readdir() */
 804
 805         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
 806                 return nfserr_inval;
 807
 808         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
 809         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
 810         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
 811
 812         if ((cookie == 1) || (cookie == 2) ||
 813             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
 814                 return nfserr_bad_cookie;
 815
 816         readdir->rd_rqstp = rqstp;
 817         readdir->rd_fhp = &cstate->current_fh;
 818         return nfs_ok;
 819 }
 820
 821 static __be32
 822 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 823                union nfsd4_op_u *u)
 824 {
 825         u->readlink.rl_rqstp = rqstp;
 826         u->readlink.rl_fhp = &cstate->current_fh;
 827         return nfs_ok;
 828 }
 829
 830 static __be32
 831 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 832              union nfsd4_op_u *u)
 833 {
 834         struct nfsd4_remove *remove = &u->remove;
 835         __be32 status;
 836
 837         if (opens_in_grace(SVC_NET(rqstp)))
 838                 return nfserr_grace;
 839         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
 840                              remove->rm_name, remove->rm_namelen);
 841         if (!status) {
 842                 fh_unlock(&cstate->current_fh);
 843                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
 844         }
 845         return status;
 846 }
 847
 848 static __be32
 849 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 850              union nfsd4_op_u *u)
 851 {
 852         struct nfsd4_rename *rename = &u->rename;
 853         __be32 status = nfserr_nofilehandle;
 854
 855         if (!cstate->save_fh.fh_dentry)
 856                 return status;
 857         if (opens_in_grace(SVC_NET(rqstp)) &&
 858                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
 859                 return nfserr_grace;
 860         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
 861                              rename->rn_snamelen, &cstate->current_fh,
 862                              rename->rn_tname, rename->rn_tnamelen);
 863         if (status)
 864                 return status;
 865         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
 866         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
 867         return nfs_ok;
 868 }
 869
 870 static __be32
 871 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 872               union nfsd4_op_u *u)
 873 {
 874         struct nfsd4_secinfo *secinfo = &u->secinfo;
 875         struct svc_export *exp;
 876         struct dentry *dentry;
 877         __be32 err;
 878
 879         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
 880         if (err)
 881                 return err;
 882         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
 883                                     secinfo->si_name, secinfo->si_namelen,
 884                                     &exp, &dentry);
 885         if (err)
 886                 return err;
 887         fh_unlock(&cstate->current_fh);
 888         if (d_really_is_negative(dentry)) {
 889                 exp_put(exp);
 890                 err = nfserr_noent;
 891         } else
 892                 secinfo->si_exp = exp;
 893         dput(dentry);
 894         if (cstate->minorversion)
 895                 /* See rfc 5661 section 2.6.3.1.1.8 */
 896                 fh_put(&cstate->current_fh);
 897         return err;
 898 }
 899
 900 static __be32
 901 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 902                 union nfsd4_op_u *u)
 903 {
 904         __be32 err;
 905
 906         switch (u->secinfo_no_name.sin_style) {
 907         case NFS4_SECINFO_STYLE4_CURRENT_FH:
 908                 break;
 909         case NFS4_SECINFO_STYLE4_PARENT:
 910                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
 911                 if (err)
 912                         return err;
 913                 break;
 914         default:
 915                 return nfserr_inval;
 916         }
 917
 918         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
 919         fh_put(&cstate->current_fh);
 920         return nfs_ok;
 921 }
 922
 923 static void
 924 nfsd4_secinfo_release(union nfsd4_op_u *u)
 925 {
 926         if (u->secinfo.si_exp)
 927                 exp_put(u->secinfo.si_exp);
 928 }
 929
 930 static __be32
 931 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 932               union nfsd4_op_u *u)
 933 {
 934         struct nfsd4_setattr *setattr = &u->setattr;
 935         __be32 status = nfs_ok;
 936         int err;
 937
 938         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
 939                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
 940                                 &cstate->current_fh, &setattr->sa_stateid,
 941                                 WR_STATE, NULL, NULL);
 942                 if (status) {
 943                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
 944                         return status;
 945                 }
 946         }
 947         err = fh_want_write(&cstate->current_fh);
 948         if (err)
 949                 return nfserrno(err);
 950         status = nfs_ok;
 951
 952         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
 953                                     nfsd_attrmask);
 954         if (status)
 955                 goto out;
 956
 957         if (setattr->sa_acl != NULL)
 958                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
 959                                             setattr->sa_acl);
 960         if (status)
 961                 goto out;
 962         if (setattr->sa_label.len)
 963                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
 964                                 &setattr->sa_label);
 965         if (status)
 966                 goto out;
 967         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
 968                                 0, (time_t)0);
 969 out:
 970         fh_drop_write(&cstate->current_fh);
 971         return status;
 972 }
 973
 974 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
 975 {
 976         int i = 1;
 977         int buflen = write->wr_buflen;
 978
 979         vec[0].iov_base = write->wr_head.iov_base;
 980         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
 981         buflen -= vec[0].iov_len;
 982
 983         while (buflen) {
 984                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
 985                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
 986                 buflen -= vec[i].iov_len;
 987                 i++;
 988         }
 989         return i;
 990 }
 991
 992 static __be32
 993 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 994             union nfsd4_op_u *u)
 995 {
 996         struct nfsd4_write *write = &u->write;
 997         stateid_t *stateid = &write->wr_stateid;
 998         struct file *filp = NULL;
 999         __be32 status = nfs_ok;
1000         unsigned long cnt;
1001         int nvecs;
1002
1003         if (write->wr_offset >= OFFSET_MAX)
1004                 return nfserr_inval;
1005
1006         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1007                                                 stateid, WR_STATE, &filp, NULL);
1008         if (status) {
1009                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1010                 return status;
1011         }
1012
1013         cnt = write->wr_buflen;
1014         write->wr_how_written = write->wr_stable_how;
1015         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1016
1017         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1018         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1019
1020         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1021                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1022                                 write->wr_how_written);
1023         fput(filp);
1024
1025         write->wr_bytes_written = cnt;
1026
1027         return status;
1028 }
1029
1030 static __be32
1031 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1032                   stateid_t *src_stateid, struct file **src,
1033                   stateid_t *dst_stateid, struct file **dst)
1034 {
1035         __be32 status;
1036
1037         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1038                                             src_stateid, RD_STATE, src, NULL);
1039         if (status) {
1040                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1041                 goto out;
1042         }
1043
1044         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1045                                             dst_stateid, WR_STATE, dst, NULL);
1046         if (status) {
1047                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1048                 goto out_put_src;
1049         }
1050
1051         /* fix up for NFS-specific error code */
1052         if (!S_ISREG(file_inode(*src)->i_mode) ||
1053             !S_ISREG(file_inode(*dst)->i_mode)) {
1054                 status = nfserr_wrong_type;
1055                 goto out_put_dst;
1056         }
1057
1058 out:
1059         return status;
1060 out_put_dst:
1061         fput(*dst);
1062 out_put_src:
1063         fput(*src);
1064         goto out;
1065 }
1066
1067 static __be32
1068 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1069                 union nfsd4_op_u *u)
1070 {
1071         struct nfsd4_clone *clone = &u->clone;
1072         struct file *src, *dst;
1073         __be32 status;
1074
1075         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1076                                    &clone->cl_dst_stateid, &dst);
1077         if (status)
1078                 goto out;
1079
1080         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1081                         dst, clone->cl_dst_pos, clone->cl_count);
1082
1083         fput(dst);
1084         fput(src);
1085 out:
1086         return status;
1087 }
1088
1089 static __be32
1090 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1091                 union nfsd4_op_u *u)
1092 {
1093         struct nfsd4_copy *copy = &u->copy;
1094         struct file *src, *dst;
1095         __be32 status;
1096         ssize_t bytes;
1097
1098         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1099                                    &copy->cp_dst_stateid, &dst);
1100         if (status)
1101                 goto out;
1102
1103         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1104                         dst, copy->cp_dst_pos, copy->cp_count);
1105
1106         if (bytes < 0)
1107                 status = nfserrno(bytes);
1108         else {
1109                 copy->cp_res.wr_bytes_written = bytes;
1110                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1111                 copy->cp_consecutive = 1;
1112                 copy->cp_synchronous = 1;
1113                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1114                 status = nfs_ok;
1115         }
1116
1117         fput(src);
1118         fput(dst);
1119 out:
1120         return status;
1121 }
1122
1123 static __be32
1124 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1125                 struct nfsd4_fallocate *fallocate, int flags)
1126 {
1127         __be32 status = nfserr_notsupp;
1128         struct file *file;
1129
1130         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1131                                             &fallocate->falloc_stateid,
1132                                             WR_STATE, &file, NULL);
1133         if (status != nfs_ok) {
1134                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1135                 return status;
1136         }
1137
1138         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1139                                      fallocate->falloc_offset,
1140                                      fallocate->falloc_length,
1141                                      flags);
1142         fput(file);
1143         return status;
1144 }
1145
1146 static __be32
1147 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1148                union nfsd4_op_u *u)
1149 {
1150         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1151 }
1152
1153 static __be32
1154 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1155                  union nfsd4_op_u *u)
1156 {
1157         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1158                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1159 }
1160
1161 static __be32
1162 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1163            union nfsd4_op_u *u)
1164 {
1165         struct nfsd4_seek *seek = &u->seek;
1166         int whence;
1167         __be32 status;
1168         struct file *file;
1169
1170         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1171                                             &seek->seek_stateid,
1172                                             RD_STATE, &file, NULL);
1173         if (status) {
1174                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1175                 return status;
1176         }
1177
1178         switch (seek->seek_whence) {
1179         case NFS4_CONTENT_DATA:
1180                 whence = SEEK_DATA;
1181                 break;
1182         case NFS4_CONTENT_HOLE:
1183                 whence = SEEK_HOLE;
1184                 break;
1185         default:
1186                 status = nfserr_union_notsupp;
1187                 goto out;
1188         }
1189
1190         /*
1191          * Note:  This call does change file->f_pos, but nothing in NFSD
1192          *        should ever file->f_pos.
1193          */
1194         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1195         if (seek->seek_pos < 0)
1196                 status = nfserrno(seek->seek_pos);
1197         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1198                 seek->seek_eof = true;
1199
1200 out:
1201         fput(file);
1202         return status;
1203 }
1204
1205 /* This routine never returns NFS_OK!  If there are no other errors, it
1206  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1207  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1208  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1209  */
1210 static __be32
1211 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1212              struct nfsd4_verify *verify)
1213 {
1214         __be32 *buf, *p;
1215         int count;
1216         __be32 status;
1217
1218         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1219         if (status)
1220                 return status;
1221
1222         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1223         if (status)
1224                 return status;
1225
1226         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1227             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1228                 return nfserr_inval;
1229         if (verify->ve_attrlen & 3)
1230                 return nfserr_inval;
1231
1232         /* count in words:
1233          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1234          */
1235         count = 4 + (verify->ve_attrlen >> 2);
1236         buf = kmalloc(count << 2, GFP_KERNEL);
1237         if (!buf)
1238                 return nfserr_jukebox;
1239
1240         p = buf;
1241         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1242                                     cstate->current_fh.fh_export,
1243                                     cstate->current_fh.fh_dentry,
1244                                     verify->ve_bmval,
1245                                     rqstp, 0);
1246         /*
1247          * If nfsd4_encode_fattr() ran out of space, assume that's because
1248          * the attributes are longer (hence different) than those given:
1249          */
1250         if (status == nfserr_resource)
1251                 status = nfserr_not_same;
1252         if (status)
1253                 goto out_kfree;
1254
1255         /* skip bitmap */
1256         p = buf + 1 + ntohl(buf[0]);
1257         status = nfserr_not_same;
1258         if (ntohl(*p++) != verify->ve_attrlen)
1259                 goto out_kfree;
1260         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1261                 status = nfserr_same;
1262
1263 out_kfree:
1264         kfree(buf);
1265         return status;
1266 }
1267
1268 static __be32
1269 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1270               union nfsd4_op_u *u)
1271 {
1272         __be32 status;
1273
1274         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1275         return status == nfserr_not_same ? nfs_ok : status;
1276 }
1277
1278 static __be32
1279 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1280              union nfsd4_op_u *u)
1281 {
1282         __be32 status;
1283
1284         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1285         return status == nfserr_same ? nfs_ok : status;
1286 }
1287
1288 #ifdef CONFIG_NFSD_PNFS
1289 static const struct nfsd4_layout_ops *
1290 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1291 {
1292         if (!exp->ex_layout_types) {
1293                 dprintk("%s: export does not support pNFS\n", __func__);
1294                 return NULL;
1295         }
1296
1297         if (layout_type >= LAYOUT_TYPE_MAX ||
1298             !(exp->ex_layout_types & (1 << layout_type))) {
1299                 dprintk("%s: layout type %d not supported\n",
1300                         __func__, layout_type);
1301                 return NULL;
1302         }
1303
1304         return nfsd4_layout_ops[layout_type];
1305 }
1306
1307 static __be32
1308 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1309                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1310 {
1311         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1312         const struct nfsd4_layout_ops *ops;
1313         struct nfsd4_deviceid_map *map;
1314         struct svc_export *exp;
1315         __be32 nfserr;
1316
1317         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1318                __func__,
1319                gdp->gd_layout_type,
1320                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1321                gdp->gd_maxcount);
1322
1323         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1324         if (!map) {
1325                 dprintk("%s: couldn't find device ID to export mapping!\n",
1326                         __func__);
1327                 return nfserr_noent;
1328         }
1329
1330         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1331         if (IS_ERR(exp)) {
1332                 dprintk("%s: could not find device id\n", __func__);
1333                 return nfserr_noent;
1334         }
1335
1336         nfserr = nfserr_layoutunavailable;
1337         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1338         if (!ops)
1339                 goto out;
1340
1341         nfserr = nfs_ok;
1342         if (gdp->gd_maxcount != 0) {
1343                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1344                                 rqstp, cstate->session->se_client, gdp);
1345         }
1346
1347         gdp->gd_notify_types &= ops->notify_types;
1348 out:
1349         exp_put(exp);
1350         return nfserr;
1351 }
1352
1353 static void
1354 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1355 {
1356         kfree(u->getdeviceinfo.gd_device);
1357 }
1358
1359 static __be32
1360 nfsd4_layoutget(struct svc_rqst *rqstp,
1361                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1362 {
1363         struct nfsd4_layoutget *lgp = &u->layoutget;
1364         struct svc_fh *current_fh = &cstate->current_fh;
1365         const struct nfsd4_layout_ops *ops;
1366         struct nfs4_layout_stateid *ls;
1367         __be32 nfserr;
1368         int accmode;
1369
1370         switch (lgp->lg_seg.iomode) {
1371         case IOMODE_READ:
1372                 accmode = NFSD_MAY_READ;
1373                 break;
1374         case IOMODE_RW:
1375                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1376                 break;
1377         default:
1378                 dprintk("%s: invalid iomode %d\n",
1379                         __func__, lgp->lg_seg.iomode);
1380                 nfserr = nfserr_badiomode;
1381                 goto out;
1382         }
1383
1384         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1385         if (nfserr)
1386                 goto out;
1387
1388         nfserr = nfserr_layoutunavailable;
1389         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1390         if (!ops)
1391                 goto out;
1392
1393         /*
1394          * Verify minlength and range as per RFC5661:
1395          *  o  If loga_length is less than loga_minlength,
1396          *     the metadata server MUST return NFS4ERR_INVAL.
1397          *  o  If the sum of loga_offset and loga_minlength exceeds
1398          *     NFS4_UINT64_MAX, and loga_minlength is not
1399          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1400          *  o  If the sum of loga_offset and loga_length exceeds
1401          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1402          *     the error NFS4ERR_INVAL MUST result.
1403          */
1404         nfserr = nfserr_inval;
1405         if (lgp->lg_seg.length < lgp->lg_minlength ||
1406             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1407              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1408             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1409              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1410                 goto out;
1411         if (lgp->lg_seg.length == 0)
1412                 goto out;
1413
1414         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1415                                                 true, lgp->lg_layout_type, &ls);
1416         if (nfserr) {
1417                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1418                 goto out;
1419         }
1420
1421         nfserr = nfserr_recallconflict;
1422         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1423                 goto out_put_stid;
1424
1425         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1426                                      current_fh, lgp);
1427         if (nfserr)
1428                 goto out_put_stid;
1429
1430         nfserr = nfsd4_insert_layout(lgp, ls);
1431
1432 out_put_stid:
1433         mutex_unlock(&ls->ls_mutex);
1434         nfs4_put_stid(&ls->ls_stid);
1435 out:
1436         return nfserr;
1437 }
1438
1439 static void
1440 nfsd4_layoutget_release(union nfsd4_op_u *u)
1441 {
1442         kfree(u->layoutget.lg_content);
1443 }
1444
1445 static __be32
1446 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1447                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1448 {
1449         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1450         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1451         struct svc_fh *current_fh = &cstate->current_fh;
1452         const struct nfsd4_layout_ops *ops;
1453         loff_t new_size = lcp->lc_last_wr + 1;
1454         struct inode *inode;
1455         struct nfs4_layout_stateid *ls;
1456         __be32 nfserr;
1457
1458         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1459         if (nfserr)
1460                 goto out;
1461
1462         nfserr = nfserr_layoutunavailable;
1463         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1464         if (!ops)
1465                 goto out;
1466         inode = d_inode(current_fh->fh_dentry);
1467
1468         nfserr = nfserr_inval;
1469         if (new_size <= seg->offset) {
1470                 dprintk("pnfsd: last write before layout segment\n");
1471                 goto out;
1472         }
1473         if (new_size > seg->offset + seg->length) {
1474                 dprintk("pnfsd: last write beyond layout segment\n");
1475                 goto out;
1476         }
1477         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1478                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1479                 goto out;
1480         }
1481
1482         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1483                                                 false, lcp->lc_layout_type,
1484                                                 &ls);
1485         if (nfserr) {
1486                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1487                 /* fixup error code as per RFC5661 */
1488                 if (nfserr == nfserr_bad_stateid)
1489                         nfserr = nfserr_badlayout;
1490                 goto out;
1491         }
1492
1493         /* LAYOUTCOMMIT does not require any serialization */
1494         mutex_unlock(&ls->ls_mutex);
1495
1496         if (new_size > i_size_read(inode)) {
1497                 lcp->lc_size_chg = 1;
1498                 lcp->lc_newsize = new_size;
1499         } else {
1500                 lcp->lc_size_chg = 0;
1501         }
1502
1503         nfserr = ops->proc_layoutcommit(inode, lcp);
1504         nfs4_put_stid(&ls->ls_stid);
1505 out:
1506         return nfserr;
1507 }
1508
1509 static __be32
1510 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1511                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1512 {
1513         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1514         struct svc_fh *current_fh = &cstate->current_fh;
1515         __be32 nfserr;
1516
1517         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1518         if (nfserr)
1519                 goto out;
1520
1521         nfserr = nfserr_layoutunavailable;
1522         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1523                 goto out;
1524
1525         switch (lrp->lr_seg.iomode) {
1526         case IOMODE_READ:
1527         case IOMODE_RW:
1528         case IOMODE_ANY:
1529                 break;
1530         default:
1531                 dprintk("%s: invalid iomode %d\n", __func__,
1532                         lrp->lr_seg.iomode);
1533                 nfserr = nfserr_inval;
1534                 goto out;
1535         }
1536
1537         switch (lrp->lr_return_type) {
1538         case RETURN_FILE:
1539                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1540                 break;
1541         case RETURN_FSID:
1542         case RETURN_ALL:
1543                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1544                 break;
1545         default:
1546                 dprintk("%s: invalid return_type %d\n", __func__,
1547                         lrp->lr_return_type);
1548                 nfserr = nfserr_inval;
1549                 break;
1550         }
1551 out:
1552         return nfserr;
1553 }
1554 #endif /* CONFIG_NFSD_PNFS */
1555
1556 /*
1557  * NULL call.
1558  */
1559 static __be32
1560 nfsd4_proc_null(struct svc_rqst *rqstp)
1561 {
1562         return nfs_ok;
1563 }
1564
1565 static inline void nfsd4_increment_op_stats(u32 opnum)
1566 {
1567         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1568                 nfsdstats.nfs4_opcount[opnum]++;
1569 }
1570
1571 static const struct nfsd4_operation nfsd4_ops[];
1572
1573 static const char *nfsd4_op_name(unsigned opnum);
1574
1575 /*
1576  * Enforce NFSv4.1 COMPOUND ordering rules:
1577  *
1578  * Also note, enforced elsewhere:
1579  *      - SEQUENCE other than as first op results in
1580  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1581  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1582  *        (Enforced in nfsd4_bind_conn_to_session().)
1583  *      - DESTROY_SESSION must be the final operation in a compound, if
1584  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1585  *        (Enforced in nfsd4_destroy_session().)
1586  */
1587 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1588 {
1589         struct nfsd4_op *op = &args->ops[0];
1590
1591         /* These ordering requirements don't apply to NFSv4.0: */
1592         if (args->minorversion == 0)
1593                 return nfs_ok;
1594         /* This is weird, but OK, not our problem: */
1595         if (args->opcnt == 0)
1596                 return nfs_ok;
1597         if (op->status == nfserr_op_illegal)
1598                 return nfs_ok;
1599         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1600                 return nfserr_op_not_in_session;
1601         if (op->opnum == OP_SEQUENCE)
1602                 return nfs_ok;
1603         if (args->opcnt != 1)
1604                 return nfserr_not_only_op;
1605         return nfs_ok;
1606 }
1607
1608 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1609 {
1610         return &nfsd4_ops[op->opnum];
1611 }
1612
1613 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1614 {
1615         if (op->opnum == OP_ILLEGAL)
1616                 return false;
1617         return OPDESC(op)->op_flags & OP_CACHEME;
1618 }
1619
1620 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1621 {
1622         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1623         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1624         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1625         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1626         const struct nfsd4_operation *thisd = OPDESC(this);
1627         const struct nfsd4_operation *nextd;
1628
1629         /*
1630          * Most ops check wronsec on our own; only the putfh-like ops
1631          * have special rules.
1632          */
1633         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1634                 return false;
1635         /*
1636          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1637          * put-filehandle operation if we're not going to use the
1638          * result:
1639          */
1640         if (argp->opcnt == resp->opcnt)
1641                 return false;
1642         if (next->opnum == OP_ILLEGAL)
1643                 return false;
1644         nextd = OPDESC(next);
1645         /*
1646          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1647          * errors themselves as necessary; others should check for them
1648          * now:
1649          */
1650         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1651 }
1652
1653 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1654                                struct nfsd4_compoundres *resp)
1655 {
1656         struct xdr_stream *xdr = &resp->xdr;
1657         struct xdr_buf *buf = &rqstp->rq_res;
1658         struct kvec *head = buf->head;
1659
1660         xdr->buf = buf;
1661         xdr->iov = head;
1662         xdr->p   = head->iov_base + head->iov_len;
1663         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1664         /* Tail and page_len should be zero at this point: */
1665         buf->len = buf->head[0].iov_len;
1666         xdr->scratch.iov_len = 0;
1667         xdr->page_ptr = buf->pages - 1;
1668         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1669                 - rqstp->rq_auth_slack;
1670 }
1671
1672 /*
1673  * COMPOUND call.
1674  */
1675 static __be32
1676 nfsd4_proc_compound(struct svc_rqst *rqstp)
1677 {
1678         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1679         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1680         struct nfsd4_op *op;
1681         struct nfsd4_compound_state *cstate = &resp->cstate;
1682         struct svc_fh *current_fh = &cstate->current_fh;
1683         struct svc_fh *save_fh = &cstate->save_fh;
1684         __be32          status;
1685
1686         svcxdr_init_encode(rqstp, resp);
1687         resp->tagp = resp->xdr.p;
1688         /* reserve space for: taglen, tag, and opcnt */
1689         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1690         resp->taglen = args->taglen;
1691         resp->tag = args->tag;
1692         resp->rqstp = rqstp;
1693         cstate->minorversion = args->minorversion;
1694         fh_init(current_fh, NFS4_FHSIZE);
1695         fh_init(save_fh, NFS4_FHSIZE);
1696         /*
1697          * Don't use the deferral mechanism for NFSv4; compounds make it
1698          * too hard to avoid non-idempotency problems.
1699          */
1700         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1701
1702         /*
1703          * According to RFC3010, this takes precedence over all other errors.
1704          */
1705         status = nfserr_minor_vers_mismatch;
1706         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1707                 goto out;
1708
1709         status = nfs41_check_op_ordering(args);
1710         if (status) {
1711                 op = &args->ops[0];
1712                 op->status = status;
1713                 goto encode_op;
1714         }
1715
1716         while (!status && resp->opcnt < args->opcnt) {
1717                 op = &args->ops[resp->opcnt++];
1718
1719                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1720                         resp->opcnt, args->opcnt, op->opnum,
1721                         nfsd4_op_name(op->opnum));
1722                 /*
1723                  * The XDR decode routines may have pre-set op->status;
1724                  * for example, if there is a miscellaneous XDR error
1725                  * it will be set to nfserr_bad_xdr.
1726                  */
1727                 if (op->status) {
1728                         if (op->opnum == OP_OPEN)
1729                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1730                         goto encode_op;
1731                 }
1732
1733                 if (!current_fh->fh_dentry) {
1734                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1735                                 op->status = nfserr_nofilehandle;
1736                                 goto encode_op;
1737                         }
1738                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1739                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1740                         op->status = nfserr_moved;
1741                         goto encode_op;
1742                 }
1743
1744                 fh_clear_wcc(current_fh);
1745
1746                 /* If op is non-idempotent */
1747                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1748                         /*
1749                          * Don't execute this op if we couldn't encode a
1750                          * succesful reply:
1751                          */
1752                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1753                         /*
1754                          * Plus if there's another operation, make sure
1755                          * we'll have space to at least encode an error:
1756                          */
1757                         if (resp->opcnt < args->opcnt)
1758                                 plen += COMPOUND_ERR_SLACK_SPACE;
1759                         op->status = nfsd4_check_resp_size(resp, plen);
1760                 }
1761
1762                 if (op->status)
1763                         goto encode_op;
1764
1765                 if (op->opdesc->op_get_currentstateid)
1766                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1767                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1768
1769                 /* Only from SEQUENCE */
1770                 if (cstate->status == nfserr_replay_cache) {
1771                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1772                         status = op->status;
1773                         goto out;
1774                 }
1775                 if (!op->status) {
1776                         if (op->opdesc->op_set_currentstateid)
1777                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1778
1779                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1780                                 clear_current_stateid(cstate);
1781
1782                         if (need_wrongsec_check(rqstp))
1783                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1784                 }
1785 encode_op:
1786                 if (op->status == nfserr_replay_me) {
1787                         op->replay = &cstate->replay_owner->so_replay;
1788                         nfsd4_encode_replay(&resp->xdr, op);
1789                         status = op->status = op->replay->rp_status;
1790                 } else {
1791                         nfsd4_encode_operation(resp, op);
1792                         status = op->status;
1793                 }
1794
1795                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1796                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1797                         be32_to_cpu(status));
1798
1799                 nfsd4_cstate_clear_replay(cstate);
1800                 nfsd4_increment_op_stats(op->opnum);
1801         }
1802
1803         cstate->status = status;
1804         fh_put(current_fh);
1805         fh_put(save_fh);
1806         BUG_ON(cstate->replay_owner);
1807 out:
1808         /* Reset deferral mechanism for RPC deferrals */
1809         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1810         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1811         return status;
1812 }
1813
1814 #define op_encode_hdr_size              (2)
1815 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1816 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1817 #define op_encode_change_info_maxsz     (5)
1818 #define nfs4_fattr_bitmap_maxsz         (4)
1819
1820 /* We'll fall back on returning no lockowner if run out of space: */
1821 #define op_encode_lockowner_maxsz       (0)
1822 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1823
1824 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1825
1826 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1827 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1828                                          op_encode_ace_maxsz)
1829
1830 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1831
1832 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1833 {
1834         return (op_encode_hdr_size) * sizeof(__be32);
1835 }
1836
1837 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1838 {
1839         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1840 }
1841
1842 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1843 {
1844         /* ac_supported, ac_resp_access */
1845         return (op_encode_hdr_size + 2)* sizeof(__be32);
1846 }
1847
1848 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1849 {
1850         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1851 }
1852
1853 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1854 {
1855         return (op_encode_hdr_size + op_encode_change_info_maxsz
1856                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1857 }
1858
1859 /*
1860  * Note since this is an idempotent operation we won't insist on failing
1861  * the op prematurely if the estimate is too large.  We may turn off splice
1862  * reads unnecessarily.
1863  */
1864 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1865                                       struct nfsd4_op *op)
1866 {
1867         u32 *bmap = op->u.getattr.ga_bmval;
1868         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1869         u32 ret = 0;
1870
1871         if (bmap0 & FATTR4_WORD0_ACL)
1872                 return svc_max_payload(rqstp);
1873         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1874                 return svc_max_payload(rqstp);
1875
1876         if (bmap1 & FATTR4_WORD1_OWNER) {
1877                 ret += IDMAP_NAMESZ + 4;
1878                 bmap1 &= ~FATTR4_WORD1_OWNER;
1879         }
1880         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1881                 ret += IDMAP_NAMESZ + 4;
1882                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1883         }
1884         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1885                 ret += NFS4_FHSIZE + 4;
1886                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1887         }
1888         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1889                 ret += NFS4_MAXLABELLEN + 12;
1890                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1891         }
1892         /*
1893          * Largest of remaining attributes are 16 bytes (e.g.,
1894          * supported_attributes)
1895          */
1896         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1897         /* bitmask, length */
1898         ret += 20;
1899         return ret;
1900 }
1901
1902 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1903 {
1904         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1905 }
1906
1907 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1908 {
1909         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1910                 * sizeof(__be32);
1911 }
1912
1913 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1914 {
1915         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1916                 * sizeof(__be32);
1917 }
1918
1919 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1920 {
1921         return (op_encode_hdr_size + op_encode_stateid_maxsz
1922                 + op_encode_change_info_maxsz + 1
1923                 + nfs4_fattr_bitmap_maxsz
1924                 + op_encode_delegation_maxsz) * sizeof(__be32);
1925 }
1926
1927 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1928 {
1929         u32 maxcount = 0, rlen = 0;
1930
1931         maxcount = svc_max_payload(rqstp);
1932         rlen = min(op->u.read.rd_length, maxcount);
1933
1934         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1935 }
1936
1937 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1938 {
1939         u32 maxcount = 0, rlen = 0;
1940
1941         maxcount = svc_max_payload(rqstp);
1942         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1943
1944         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1945                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1946 }
1947
1948 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1949 {
1950         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1951 }
1952
1953 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1954 {
1955         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1956                 * sizeof(__be32);
1957 }
1958
1959 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1960 {
1961         return (op_encode_hdr_size + op_encode_change_info_maxsz
1962                 + op_encode_change_info_maxsz) * sizeof(__be32);
1963 }
1964
1965 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1966                                        struct nfsd4_op *op)
1967 {
1968         return (op_encode_hdr_size
1969                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1970 }
1971
1972 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1973 {
1974         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1975                 * sizeof(__be32);
1976 }
1977
1978 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1979 {
1980         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1981 }
1982
1983 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1984 {
1985         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1986                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
1987 }
1988
1989 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1990 {
1991         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1992                                                                 sizeof(__be32);
1993 }
1994
1995 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1996 {
1997         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1998 }
1999
2000 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2001 {
2002         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
2003                 1 + 1 + /* eir_flags, spr_how */\
2004                 4 + /* spo_must_enforce & _allow with bitmap */\
2005                 2 + /*eir_server_owner.so_minor_id */\
2006                 /* eir_server_owner.so_major_id<> */\
2007                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2008                 /* eir_server_scope<> */\
2009                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2010                 1 + /* eir_server_impl_id array length */\
2011                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2012 }
2013
2014 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2015 {
2016         return (op_encode_hdr_size + \
2017                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2018                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2019 }
2020
2021 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2022 {
2023         return (op_encode_hdr_size + \
2024                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2025                 2 + /* csr_sequence, csr_flags */\
2026                 op_encode_channel_attrs_maxsz + \
2027                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2028 }
2029
2030 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2031 {
2032         return (op_encode_hdr_size +
2033                 1 /* wr_callback */ +
2034                 op_encode_stateid_maxsz /* wr_callback */ +
2035                 2 /* wr_count */ +
2036                 1 /* wr_committed */ +
2037                 op_encode_verifier_maxsz +
2038                 1 /* cr_consecutive */ +
2039                 1 /* cr_synchronous */) * sizeof(__be32);
2040 }
2041
2042 #ifdef CONFIG_NFSD_PNFS
2043 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2044 {
2045         u32 maxcount = 0, rlen = 0;
2046
2047         maxcount = svc_max_payload(rqstp);
2048         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2049
2050         return (op_encode_hdr_size +
2051                 1 /* gd_layout_type*/ +
2052                 XDR_QUADLEN(rlen) +
2053                 2 /* gd_notify_types */) * sizeof(__be32);
2054 }
2055
2056 /*
2057  * At this stage we don't really know what layout driver will handle the request,
2058  * so we need to define an arbitrary upper bound here.
2059  */
2060 #define MAX_LAYOUT_SIZE         128
2061 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2062 {
2063         return (op_encode_hdr_size +
2064                 1 /* logr_return_on_close */ +
2065                 op_encode_stateid_maxsz +
2066                 1 /* nr of layouts */ +
2067                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2068 }
2069
2070 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2071 {
2072         return (op_encode_hdr_size +
2073                 1 /* locr_newsize */ +
2074                 2 /* ns_size */) * sizeof(__be32);
2075 }
2076
2077 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2078 {
2079         return (op_encode_hdr_size +
2080                 1 /* lrs_stateid */ +
2081                 op_encode_stateid_maxsz) * sizeof(__be32);
2082 }
2083 #endif /* CONFIG_NFSD_PNFS */
2084
2085
2086 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2087 {
2088         return (op_encode_hdr_size + 3) * sizeof(__be32);
2089 }
2090
2091 static const struct nfsd4_operation nfsd4_ops[] = {
2092         [OP_ACCESS] = {
2093                 .op_func = nfsd4_access,
2094                 .op_name = "OP_ACCESS",
2095                 .op_rsize_bop = nfsd4_access_rsize,
2096         },
2097         [OP_CLOSE] = {
2098                 .op_func = nfsd4_close,
2099                 .op_flags = OP_MODIFIES_SOMETHING,
2100                 .op_name = "OP_CLOSE",
2101                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2102                 .op_get_currentstateid = nfsd4_get_closestateid,
2103                 .op_set_currentstateid = nfsd4_set_closestateid,
2104         },
2105         [OP_COMMIT] = {
2106                 .op_func = nfsd4_commit,
2107                 .op_flags = OP_MODIFIES_SOMETHING,
2108                 .op_name = "OP_COMMIT",
2109                 .op_rsize_bop = nfsd4_commit_rsize,
2110         },
2111         [OP_CREATE] = {
2112                 .op_func = nfsd4_create,
2113                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2114                 .op_name = "OP_CREATE",
2115                 .op_rsize_bop = nfsd4_create_rsize,
2116         },
2117         [OP_DELEGRETURN] = {
2118                 .op_func = nfsd4_delegreturn,
2119                 .op_flags = OP_MODIFIES_SOMETHING,
2120                 .op_name = "OP_DELEGRETURN",
2121                 .op_rsize_bop = nfsd4_only_status_rsize,
2122                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2123         },
2124         [OP_GETATTR] = {
2125                 .op_func = nfsd4_getattr,
2126                 .op_flags = ALLOWED_ON_ABSENT_FS,
2127                 .op_rsize_bop = nfsd4_getattr_rsize,
2128                 .op_name = "OP_GETATTR",
2129         },
2130         [OP_GETFH] = {
2131                 .op_func = nfsd4_getfh,
2132                 .op_name = "OP_GETFH",
2133                 .op_rsize_bop = nfsd4_getfh_rsize,
2134         },
2135         [OP_LINK] = {
2136                 .op_func = nfsd4_link,
2137                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2138                                 | OP_CACHEME,
2139                 .op_name = "OP_LINK",
2140                 .op_rsize_bop = nfsd4_link_rsize,
2141         },
2142         [OP_LOCK] = {
2143                 .op_func = nfsd4_lock,
2144                 .op_flags = OP_MODIFIES_SOMETHING |
2145                                 OP_NONTRIVIAL_ERROR_ENCODE,
2146                 .op_name = "OP_LOCK",
2147                 .op_rsize_bop = nfsd4_lock_rsize,
2148                 .op_set_currentstateid = nfsd4_set_lockstateid,
2149         },
2150         [OP_LOCKT] = {
2151                 .op_func = nfsd4_lockt,
2152                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2153                 .op_name = "OP_LOCKT",
2154                 .op_rsize_bop = nfsd4_lock_rsize,
2155         },
2156         [OP_LOCKU] = {
2157                 .op_func = nfsd4_locku,
2158                 .op_flags = OP_MODIFIES_SOMETHING,
2159                 .op_name = "OP_LOCKU",
2160                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2161                 .op_get_currentstateid = nfsd4_get_lockustateid,
2162         },
2163         [OP_LOOKUP] = {
2164                 .op_func = nfsd4_lookup,
2165                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2166                 .op_name = "OP_LOOKUP",
2167                 .op_rsize_bop = nfsd4_only_status_rsize,
2168         },
2169         [OP_LOOKUPP] = {
2170                 .op_func = nfsd4_lookupp,
2171                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2172                 .op_name = "OP_LOOKUPP",
2173                 .op_rsize_bop = nfsd4_only_status_rsize,
2174         },
2175         [OP_NVERIFY] = {
2176                 .op_func = nfsd4_nverify,
2177                 .op_name = "OP_NVERIFY",
2178                 .op_rsize_bop = nfsd4_only_status_rsize,
2179         },
2180         [OP_OPEN] = {
2181                 .op_func = nfsd4_open,
2182                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2183                 .op_name = "OP_OPEN",
2184                 .op_rsize_bop = nfsd4_open_rsize,
2185                 .op_set_currentstateid = nfsd4_set_openstateid,
2186         },
2187         [OP_OPEN_CONFIRM] = {
2188                 .op_func = nfsd4_open_confirm,
2189                 .op_flags = OP_MODIFIES_SOMETHING,
2190                 .op_name = "OP_OPEN_CONFIRM",
2191                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2192         },
2193         [OP_OPEN_DOWNGRADE] = {
2194                 .op_func = nfsd4_open_downgrade,
2195                 .op_flags = OP_MODIFIES_SOMETHING,
2196                 .op_name = "OP_OPEN_DOWNGRADE",
2197                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2198                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2199                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2200         },
2201         [OP_PUTFH] = {
2202                 .op_func = nfsd4_putfh,
2203                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2204                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2205                 .op_name = "OP_PUTFH",
2206                 .op_rsize_bop = nfsd4_only_status_rsize,
2207         },
2208         [OP_PUTPUBFH] = {
2209                 .op_func = nfsd4_putrootfh,
2210                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2211                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2212                 .op_name = "OP_PUTPUBFH",
2213                 .op_rsize_bop = nfsd4_only_status_rsize,
2214         },
2215         [OP_PUTROOTFH] = {
2216                 .op_func = nfsd4_putrootfh,
2217                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2218                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2219                 .op_name = "OP_PUTROOTFH",
2220                 .op_rsize_bop = nfsd4_only_status_rsize,
2221         },
2222         [OP_READ] = {
2223                 .op_func = nfsd4_read,
2224                 .op_release = nfsd4_read_release,
2225                 .op_name = "OP_READ",
2226                 .op_rsize_bop = nfsd4_read_rsize,
2227                 .op_get_currentstateid = nfsd4_get_readstateid,
2228         },
2229         [OP_READDIR] = {
2230                 .op_func = nfsd4_readdir,
2231                 .op_name = "OP_READDIR",
2232                 .op_rsize_bop = nfsd4_readdir_rsize,
2233         },
2234         [OP_READLINK] = {
2235                 .op_func = nfsd4_readlink,
2236                 .op_name = "OP_READLINK",
2237                 .op_rsize_bop = nfsd4_readlink_rsize,
2238         },
2239         [OP_REMOVE] = {
2240                 .op_func = nfsd4_remove,
2241                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2242                 .op_name = "OP_REMOVE",
2243                 .op_rsize_bop = nfsd4_remove_rsize,
2244         },
2245         [OP_RENAME] = {
2246                 .op_func = nfsd4_rename,
2247                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2248                 .op_name = "OP_RENAME",
2249                 .op_rsize_bop = nfsd4_rename_rsize,
2250         },
2251         [OP_RENEW] = {
2252                 .op_func = nfsd4_renew,
2253                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2254                                 | OP_MODIFIES_SOMETHING,
2255                 .op_name = "OP_RENEW",
2256                 .op_rsize_bop = nfsd4_only_status_rsize,
2257
2258         },
2259         [OP_RESTOREFH] = {
2260                 .op_func = nfsd4_restorefh,
2261                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2262                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2263                 .op_name = "OP_RESTOREFH",
2264                 .op_rsize_bop = nfsd4_only_status_rsize,
2265         },
2266         [OP_SAVEFH] = {
2267                 .op_func = nfsd4_savefh,
2268                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2269                 .op_name = "OP_SAVEFH",
2270                 .op_rsize_bop = nfsd4_only_status_rsize,
2271         },
2272         [OP_SECINFO] = {
2273                 .op_func = nfsd4_secinfo,
2274                 .op_release = nfsd4_secinfo_release,
2275                 .op_flags = OP_HANDLES_WRONGSEC,
2276                 .op_name = "OP_SECINFO",
2277                 .op_rsize_bop = nfsd4_secinfo_rsize,
2278         },
2279         [OP_SETATTR] = {
2280                 .op_func = nfsd4_setattr,
2281                 .op_name = "OP_SETATTR",
2282                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2283                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2284                 .op_rsize_bop = nfsd4_setattr_rsize,
2285                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2286         },
2287         [OP_SETCLIENTID] = {
2288                 .op_func = nfsd4_setclientid,
2289                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2290                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2291                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2292                 .op_name = "OP_SETCLIENTID",
2293                 .op_rsize_bop = nfsd4_setclientid_rsize,
2294         },
2295         [OP_SETCLIENTID_CONFIRM] = {
2296                 .op_func = nfsd4_setclientid_confirm,
2297                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2298                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2299                 .op_name = "OP_SETCLIENTID_CONFIRM",
2300                 .op_rsize_bop = nfsd4_only_status_rsize,
2301         },
2302         [OP_VERIFY] = {
2303                 .op_func = nfsd4_verify,
2304                 .op_name = "OP_VERIFY",
2305                 .op_rsize_bop = nfsd4_only_status_rsize,
2306         },
2307         [OP_WRITE] = {
2308                 .op_func = nfsd4_write,
2309                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2310                 .op_name = "OP_WRITE",
2311                 .op_rsize_bop = nfsd4_write_rsize,
2312                 .op_get_currentstateid = nfsd4_get_writestateid,
2313         },
2314         [OP_RELEASE_LOCKOWNER] = {
2315                 .op_func = nfsd4_release_lockowner,
2316                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2317                                 | OP_MODIFIES_SOMETHING,
2318                 .op_name = "OP_RELEASE_LOCKOWNER",
2319                 .op_rsize_bop = nfsd4_only_status_rsize,
2320         },
2321
2322         /* NFSv4.1 operations */
2323         [OP_EXCHANGE_ID] = {
2324                 .op_func = nfsd4_exchange_id,
2325                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2326                                 | OP_MODIFIES_SOMETHING,
2327                 .op_name = "OP_EXCHANGE_ID",
2328                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2329         },
2330         [OP_BACKCHANNEL_CTL] = {
2331                 .op_func = nfsd4_backchannel_ctl,
2332                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2333                 .op_name = "OP_BACKCHANNEL_CTL",
2334                 .op_rsize_bop = nfsd4_only_status_rsize,
2335         },
2336         [OP_BIND_CONN_TO_SESSION] = {
2337                 .op_func = nfsd4_bind_conn_to_session,
2338                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2339                                 | OP_MODIFIES_SOMETHING,
2340                 .op_name = "OP_BIND_CONN_TO_SESSION",
2341                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2342         },
2343         [OP_CREATE_SESSION] = {
2344                 .op_func = nfsd4_create_session,
2345                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2346                                 | OP_MODIFIES_SOMETHING,
2347                 .op_name = "OP_CREATE_SESSION",
2348                 .op_rsize_bop = nfsd4_create_session_rsize,
2349         },
2350         [OP_DESTROY_SESSION] = {
2351                 .op_func = nfsd4_destroy_session,
2352                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2353                                 | OP_MODIFIES_SOMETHING,
2354                 .op_name = "OP_DESTROY_SESSION",
2355                 .op_rsize_bop = nfsd4_only_status_rsize,
2356         },
2357         [OP_SEQUENCE] = {
2358                 .op_func = nfsd4_sequence,
2359                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2360                 .op_name = "OP_SEQUENCE",
2361                 .op_rsize_bop = nfsd4_sequence_rsize,
2362         },
2363         [OP_DESTROY_CLIENTID] = {
2364                 .op_func = nfsd4_destroy_clientid,
2365                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2366                                 | OP_MODIFIES_SOMETHING,
2367                 .op_name = "OP_DESTROY_CLIENTID",
2368                 .op_rsize_bop = nfsd4_only_status_rsize,
2369         },
2370         [OP_RECLAIM_COMPLETE] = {
2371                 .op_func = nfsd4_reclaim_complete,
2372                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2373                 .op_name = "OP_RECLAIM_COMPLETE",
2374                 .op_rsize_bop = nfsd4_only_status_rsize,
2375         },
2376         [OP_SECINFO_NO_NAME] = {
2377                 .op_func = nfsd4_secinfo_no_name,
2378                 .op_release = nfsd4_secinfo_release,
2379                 .op_flags = OP_HANDLES_WRONGSEC,
2380                 .op_name = "OP_SECINFO_NO_NAME",
2381                 .op_rsize_bop = nfsd4_secinfo_rsize,
2382         },
2383         [OP_TEST_STATEID] = {
2384                 .op_func = nfsd4_test_stateid,
2385                 .op_flags = ALLOWED_WITHOUT_FH,
2386                 .op_name = "OP_TEST_STATEID",
2387                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2388         },
2389         [OP_FREE_STATEID] = {
2390                 .op_func = nfsd4_free_stateid,
2391                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2392                 .op_name = "OP_FREE_STATEID",
2393                 .op_get_currentstateid = nfsd4_get_freestateid,
2394                 .op_rsize_bop = nfsd4_only_status_rsize,
2395         },
2396 #ifdef CONFIG_NFSD_PNFS
2397         [OP_GETDEVICEINFO] = {
2398                 .op_func = nfsd4_getdeviceinfo,
2399                 .op_release = nfsd4_getdeviceinfo_release,
2400                 .op_flags = ALLOWED_WITHOUT_FH,
2401                 .op_name = "OP_GETDEVICEINFO",
2402                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2403         },
2404         [OP_LAYOUTGET] = {
2405                 .op_func = nfsd4_layoutget,
2406                 .op_release = nfsd4_layoutget_release,
2407                 .op_flags = OP_MODIFIES_SOMETHING,
2408                 .op_name = "OP_LAYOUTGET",
2409                 .op_rsize_bop = nfsd4_layoutget_rsize,
2410         },
2411         [OP_LAYOUTCOMMIT] = {
2412                 .op_func = nfsd4_layoutcommit,
2413                 .op_flags = OP_MODIFIES_SOMETHING,
2414                 .op_name = "OP_LAYOUTCOMMIT",
2415                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2416         },
2417         [OP_LAYOUTRETURN] = {
2418                 .op_func = nfsd4_layoutreturn,
2419                 .op_flags = OP_MODIFIES_SOMETHING,
2420                 .op_name = "OP_LAYOUTRETURN",
2421                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2422         },
2423 #endif /* CONFIG_NFSD_PNFS */
2424
2425         /* NFSv4.2 operations */
2426         [OP_ALLOCATE] = {
2427                 .op_func = nfsd4_allocate,
2428                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2429                 .op_name = "OP_ALLOCATE",
2430                 .op_rsize_bop = nfsd4_only_status_rsize,
2431         },
2432         [OP_DEALLOCATE] = {
2433                 .op_func = nfsd4_deallocate,
2434                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2435                 .op_name = "OP_DEALLOCATE",
2436                 .op_rsize_bop = nfsd4_only_status_rsize,
2437         },
2438         [OP_CLONE] = {
2439                 .op_func = nfsd4_clone,
2440                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2441                 .op_name = "OP_CLONE",
2442                 .op_rsize_bop = nfsd4_only_status_rsize,
2443         },
2444         [OP_COPY] = {
2445                 .op_func = nfsd4_copy,
2446                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2447                 .op_name = "OP_COPY",
2448                 .op_rsize_bop = nfsd4_copy_rsize,
2449         },
2450         [OP_SEEK] = {
2451                 .op_func = nfsd4_seek,
2452                 .op_name = "OP_SEEK",
2453                 .op_rsize_bop = nfsd4_seek_rsize,
2454         },
2455 };
2456
2457 /**
2458  * nfsd4_spo_must_allow - Determine if the compound op contains an
2459  * operation that is allowed to be sent with machine credentials
2460  *
2461  * @rqstp: a pointer to the struct svc_rqst
2462  *
2463  * Checks to see if the compound contains a spo_must_allow op
2464  * and confirms that it was sent with the proper machine creds.
2465  */
2466
2467 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2468 {
2469         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2470         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2471         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2472         struct nfsd4_compound_state *cstate = &resp->cstate;
2473         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2474         u32 opiter;
2475
2476         if (!cstate->minorversion)
2477                 return false;
2478
2479         if (cstate->spo_must_allowed == true)
2480                 return true;
2481
2482         opiter = resp->opcnt;
2483         while (opiter < argp->opcnt) {
2484                 this = &argp->ops[opiter++];
2485                 if (test_bit(this->opnum, allow->u.longs) &&
2486                         cstate->clp->cl_mach_cred &&
2487                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2488                         cstate->spo_must_allowed = true;
2489                         return true;
2490                 }
2491         }
2492         cstate->spo_must_allowed = false;
2493         return false;
2494 }
2495
2496 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2497 {
2498         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2499                 return op_encode_hdr_size * sizeof(__be32);
2500
2501         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2502         return OPDESC(op)->op_rsize_bop(rqstp, op);
2503 }
2504
2505 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2506 {
2507         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2508                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2509                         op->opnum, nfsd4_op_name(op->opnum));
2510                 WARN_ON_ONCE(1);
2511         }
2512 }
2513
2514 static const char *nfsd4_op_name(unsigned opnum)
2515 {
2516         if (opnum < ARRAY_SIZE(nfsd4_ops))
2517                 return nfsd4_ops[opnum].op_name;
2518         return "unknown_operation";
2519 }
2520
2521 #define nfsd4_voidres                   nfsd4_voidargs
2522 struct nfsd4_voidargs { int dummy; };
2523
2524 static const struct svc_procedure nfsd_procedures4[2] = {
2525         [NFSPROC4_NULL] = {
2526                 .pc_func = nfsd4_proc_null,
2527                 .pc_encode = nfs4svc_encode_voidres,
2528                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2529                 .pc_ressize = sizeof(struct nfsd4_voidres),
2530                 .pc_cachetype = RC_NOCACHE,
2531                 .pc_xdrressize = 1,
2532         },
2533         [NFSPROC4_COMPOUND] = {
2534                 .pc_func = nfsd4_proc_compound,
2535                 .pc_decode = nfs4svc_decode_compoundargs,
2536                 .pc_encode = nfs4svc_encode_compoundres,
2537                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2538                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2539                 .pc_release = nfsd4_release_compoundargs,
2540                 .pc_cachetype = RC_NOCACHE,
2541                 .pc_xdrressize = NFSD_BUFSIZE/4,
2542         },
2543 };
2544
2545 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2546 const struct svc_version nfsd_version4 = {
2547         .vs_vers                = 4,
2548         .vs_nproc               = 2,
2549         .vs_proc                = nfsd_procedures4,
2550         .vs_count               = nfsd_count3,
2551         .vs_dispatch            = nfsd_dispatch,
2552         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2553         .vs_rpcb_optnl          = true,
2554         .vs_need_cong_ctrl      = true,
2555 };
2556
2557 /*
2558  * Local variables:
2559  *  c-basic-offset: 8
2560  * End:
2561  */