fs/nfs/nfs4xdr.c

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Client-side XDR for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <[email protected]>
  10  *  Andy Adamson   <[email protected]>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/param.h>
  39 #include <linux/time.h>
  40 #include <linux/mm.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/in.h>
  44 #include <linux/pagemap.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/kdev_t.h>
  47 #include <linux/sunrpc/clnt.h>
  48 #include <linux/sunrpc/msg_prot.h>
  49 #include <linux/nfs.h>
  50 #include <linux/nfs4.h>
  51 #include <linux/nfs_fs.h>
  52 #include <linux/nfs_idmap.h>
  53 #include "nfs4_fs.h"
  54 #include "internal.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_XDR
  57
  58 /* Mapping from NFS error code to "errno" error code. */
  59 #define errno_NFSERR_IO         EIO
  60
  61 static int nfs4_stat_to_errno(int);
  62
  63 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
  64 #ifdef DEBUG
  65 #define NFS4_MAXTAGLEN          20
  66 #else
  67 #define NFS4_MAXTAGLEN          0
  68 #endif
  69
  70 /* lock,open owner id:
  71  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
  72  */
  73 #define open_owner_id_maxsz     (1 + 4)
  74 #define lock_owner_id_maxsz     (1 + 4)
  75 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
  76 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
  77 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
  78 #define op_encode_hdr_maxsz     (1)
  79 #define op_decode_hdr_maxsz     (2)
  80 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
  81 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
  82 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  83 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  84 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
  85                                 (NFS4_FHSIZE >> 2))
  86 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
  87 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
  88 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
  89 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
  90 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
  91                                 ((3+NFS4_FHSIZE) >> 2))
  92 #define nfs4_fattr_bitmap_maxsz 3
  93 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
  94 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
  95 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
  96 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
  97 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
  98 /* This is based on getfattr, which uses the most attributes: */
  99 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
 100                                 3 + 3 + 3 + nfs4_owner_maxsz + nfs4_group_maxsz))
 101 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
 102                                 nfs4_fattr_value_maxsz)
 103 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
 104 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
 105                                  1 + 2 + 1 + \
 106                                 nfs4_owner_maxsz + \
 107                                 nfs4_group_maxsz + \
 108                                 4 + 4)
 109 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
 110 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
 111 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
 112 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
 113 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
 114 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + 11)
 115 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
 116 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
 117 #define encode_setclientid_maxsz \
 118                                 (op_encode_hdr_maxsz + \
 119                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
 120                                 XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
 121                                 1 /* sc_prog */ + \
 122                                 XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
 123                                 XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
 124                                 1) /* sc_cb_ident */
 125 #define decode_setclientid_maxsz \
 126                                 (op_decode_hdr_maxsz + \
 127                                 2 + \
 128                                 1024) /* large value for CLID_INUSE */
 129 #define encode_setclientid_confirm_maxsz \
 130                                 (op_encode_hdr_maxsz + \
 131                                 3 + (NFS4_VERIFIER_SIZE >> 2))
 132 #define decode_setclientid_confirm_maxsz \
 133                                 (op_decode_hdr_maxsz)
 134 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
 135 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
 136 #define encode_share_access_maxsz \
 137                                 (2)
 138 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
 139 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
 140 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
 141 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
 142                                 2 + encode_share_access_maxsz + 2 + \
 143                                 open_owner_id_maxsz + \
 144                                 encode_opentype_maxsz + \
 145                                 encode_claim_null_maxsz)
 146 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
 147 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
 148                                 decode_ace_maxsz)
 149 #define decode_change_info_maxsz        (5)
 150 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
 151                                 decode_stateid_maxsz + \
 152                                 decode_change_info_maxsz + 1 + \
 153                                 nfs4_fattr_bitmap_maxsz + \
 154                                 decode_delegation_maxsz)
 155 #define encode_open_confirm_maxsz \
 156                                 (op_encode_hdr_maxsz + \
 157                                  encode_stateid_maxsz + 1)
 158 #define decode_open_confirm_maxsz \
 159                                 (op_decode_hdr_maxsz + \
 160                                  decode_stateid_maxsz)
 161 #define encode_open_downgrade_maxsz \
 162                                 (op_encode_hdr_maxsz + \
 163                                  encode_stateid_maxsz + 1 + \
 164                                  encode_share_access_maxsz)
 165 #define decode_open_downgrade_maxsz \
 166                                 (op_decode_hdr_maxsz + \
 167                                  decode_stateid_maxsz)
 168 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
 169                                  1 + encode_stateid_maxsz)
 170 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
 171                                  decode_stateid_maxsz)
 172 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
 173                                  encode_stateid_maxsz + \
 174                                  encode_attrs_maxsz)
 175 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
 176                                  nfs4_fattr_bitmap_maxsz)
 177 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
 178                                  encode_stateid_maxsz + 3)
 179 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
 180 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
 181                                  2 + encode_verifier_maxsz + 5)
 182 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
 183                                  decode_verifier_maxsz)
 184 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
 185 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
 186 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
 187                                  encode_stateid_maxsz + 4)
 188 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
 189                                  2 + decode_verifier_maxsz)
 190 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
 191 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
 192                                  decode_verifier_maxsz)
 193 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
 194                                 nfs4_name_maxsz)
 195 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
 196                                  decode_change_info_maxsz)
 197 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
 198                                 2 * nfs4_name_maxsz)
 199 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
 200                                  decode_change_info_maxsz + \
 201                                  decode_change_info_maxsz)
 202 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
 203                                 nfs4_name_maxsz)
 204 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
 205 #define encode_lockowner_maxsz  (7)
 206 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
 207                                  7 + \
 208                                  1 + encode_stateid_maxsz + 1 + \
 209                                  encode_lockowner_maxsz)
 210 #define decode_lock_denied_maxsz \
 211                                 (8 + decode_lockowner_maxsz)
 212 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
 213                                  decode_lock_denied_maxsz)
 214 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
 215                                 encode_lockowner_maxsz)
 216 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
 217                                  decode_lock_denied_maxsz)
 218 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
 219                                  encode_stateid_maxsz + \
 220                                  4)
 221 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
 222                                  decode_stateid_maxsz)
 223 #define encode_release_lockowner_maxsz \
 224                                 (op_encode_hdr_maxsz + \
 225                                  encode_lockowner_maxsz)
 226 #define decode_release_lockowner_maxsz \
 227                                 (op_decode_hdr_maxsz)
 228 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
 229 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
 230 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
 231                                 1 + nfs4_name_maxsz + \
 232                                 1 + \
 233                                 nfs4_fattr_maxsz)
 234 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
 235 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
 236                                 1 + 2 + nfs4_name_maxsz + \
 237                                 encode_attrs_maxsz)
 238 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
 239                                 decode_change_info_maxsz + \
 240                                 nfs4_fattr_bitmap_maxsz)
 241 #define encode_statfs_maxsz     (encode_getattr_maxsz)
 242 #define decode_statfs_maxsz     (decode_getattr_maxsz)
 243 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
 244 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
 245 #define encode_getacl_maxsz     (encode_getattr_maxsz)
 246 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
 247                                  nfs4_fattr_bitmap_maxsz + 1)
 248 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
 249                                  encode_stateid_maxsz + 3)
 250 #define decode_setacl_maxsz     (decode_setattr_maxsz)
 251 #define encode_fs_locations_maxsz \
 252                                 (encode_getattr_maxsz)
 253 #define decode_fs_locations_maxsz \
 254                                 (0)
 255
 256 #if defined(CONFIG_NFS_V4_1)
 257 #define NFS4_MAX_MACHINE_NAME_LEN (64)
 258
 259 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
 260                                 encode_verifier_maxsz + \
 261                                 1 /* co_ownerid.len */ + \
 262                                 XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
 263                                 1 /* flags */ + \
 264                                 1 /* spa_how */ + \
 265                                 0 /* SP4_NONE (for now) */ + \
 266                                 1 /* zero implemetation id array */)
 267 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
 268                                 2 /* eir_clientid */ + \
 269                                 1 /* eir_sequenceid */ + \
 270                                 1 /* eir_flags */ + \
 271                                 1 /* spr_how */ + \
 272                                 0 /* SP4_NONE (for now) */ + \
 273                                 2 /* eir_server_owner.so_minor_id */ + \
 274                                 /* eir_server_owner.so_major_id<> */ \
 275                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 276                                 /* eir_server_scope<> */ \
 277                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 278                                 1 /* eir_server_impl_id array length */ + \
 279                                 0 /* ignored eir_server_impl_id contents */)
 280 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
 281 #define decode_channel_attrs_maxsz  (6 + \
 282                                      1 /* ca_rdma_ird.len */ + \
 283                                      1 /* ca_rdma_ird */)
 284 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
 285                                      2 /* csa_clientid */ + \
 286                                      1 /* csa_sequence */ + \
 287                                      1 /* csa_flags */ + \
 288                                      encode_channel_attrs_maxsz + \
 289                                      encode_channel_attrs_maxsz + \
 290                                      1 /* csa_cb_program */ + \
 291                                      1 /* csa_sec_parms.len (1) */ + \
 292                                      1 /* cb_secflavor (AUTH_SYS) */ + \
 293                                      1 /* stamp */ + \
 294                                      1 /* machinename.len */ + \
 295                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
 296                                      1 /* uid */ + \
 297                                      1 /* gid */ + \
 298                                      1 /* gids.len (0) */)
 299 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
 300                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
 301                                      1 /* csr_sequence */ + \
 302                                      1 /* csr_flags */ + \
 303                                      decode_channel_attrs_maxsz + \
 304                                      decode_channel_attrs_maxsz)
 305 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
 306 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
 307 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
 308                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
 309 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
 310                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
 311 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
 312 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
 313 #else /* CONFIG_NFS_V4_1 */
 314 #define encode_sequence_maxsz   0
 315 #define decode_sequence_maxsz   0
 316 #endif /* CONFIG_NFS_V4_1 */
 317
 318 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
 319 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
 320 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
 321                                 encode_sequence_maxsz + \
 322                                 encode_putfh_maxsz + \
 323                                 encode_read_maxsz)
 324 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
 325                                 decode_sequence_maxsz + \
 326                                 decode_putfh_maxsz + \
 327                                 decode_read_maxsz)
 328 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
 329                                 encode_sequence_maxsz + \
 330                                 encode_putfh_maxsz + \
 331                                 encode_readlink_maxsz)
 332 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
 333                                 decode_sequence_maxsz + \
 334                                 decode_putfh_maxsz + \
 335                                 decode_readlink_maxsz)
 336 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
 337                                 encode_sequence_maxsz + \
 338                                 encode_putfh_maxsz + \
 339                                 encode_readdir_maxsz)
 340 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
 341                                 decode_sequence_maxsz + \
 342                                 decode_putfh_maxsz + \
 343                                 decode_readdir_maxsz)
 344 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
 345                                 encode_sequence_maxsz + \
 346                                 encode_putfh_maxsz + \
 347                                 encode_write_maxsz + \
 348                                 encode_getattr_maxsz)
 349 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
 350                                 decode_sequence_maxsz + \
 351                                 decode_putfh_maxsz + \
 352                                 decode_write_maxsz + \
 353                                 decode_getattr_maxsz)
 354 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
 355                                 encode_sequence_maxsz + \
 356                                 encode_putfh_maxsz + \
 357                                 encode_commit_maxsz + \
 358                                 encode_getattr_maxsz)
 359 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
 360                                 decode_sequence_maxsz + \
 361                                 decode_putfh_maxsz + \
 362                                 decode_commit_maxsz + \
 363                                 decode_getattr_maxsz)
 364 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
 365                                 encode_sequence_maxsz + \
 366                                 encode_putfh_maxsz + \
 367                                 encode_savefh_maxsz + \
 368                                 encode_open_maxsz + \
 369                                 encode_getfh_maxsz + \
 370                                 encode_getattr_maxsz + \
 371                                 encode_restorefh_maxsz + \
 372                                 encode_getattr_maxsz)
 373 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
 374                                 decode_sequence_maxsz + \
 375                                 decode_putfh_maxsz + \
 376                                 decode_savefh_maxsz + \
 377                                 decode_open_maxsz + \
 378                                 decode_getfh_maxsz + \
 379                                 decode_getattr_maxsz + \
 380                                 decode_restorefh_maxsz + \
 381                                 decode_getattr_maxsz)
 382 #define NFS4_enc_open_confirm_sz \
 383                                 (compound_encode_hdr_maxsz + \
 384                                  encode_putfh_maxsz + \
 385                                  encode_open_confirm_maxsz)
 386 #define NFS4_dec_open_confirm_sz \
 387                                 (compound_decode_hdr_maxsz + \
 388                                  decode_putfh_maxsz + \
 389                                  decode_open_confirm_maxsz)
 390 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
 391                                         encode_sequence_maxsz + \
 392                                         encode_putfh_maxsz + \
 393                                         encode_open_maxsz + \
 394                                         encode_getattr_maxsz)
 395 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
 396                                         decode_sequence_maxsz + \
 397                                         decode_putfh_maxsz + \
 398                                         decode_open_maxsz + \
 399                                         decode_getattr_maxsz)
 400 #define NFS4_enc_open_downgrade_sz \
 401                                 (compound_encode_hdr_maxsz + \
 402                                  encode_sequence_maxsz + \
 403                                  encode_putfh_maxsz + \
 404                                  encode_open_downgrade_maxsz + \
 405                                  encode_getattr_maxsz)
 406 #define NFS4_dec_open_downgrade_sz \
 407                                 (compound_decode_hdr_maxsz + \
 408                                  decode_sequence_maxsz + \
 409                                  decode_putfh_maxsz + \
 410                                  decode_open_downgrade_maxsz + \
 411                                  decode_getattr_maxsz)
 412 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
 413                                  encode_sequence_maxsz + \
 414                                  encode_putfh_maxsz + \
 415                                  encode_close_maxsz + \
 416                                  encode_getattr_maxsz)
 417 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
 418                                  decode_sequence_maxsz + \
 419                                  decode_putfh_maxsz + \
 420                                  decode_close_maxsz + \
 421                                  decode_getattr_maxsz)
 422 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
 423                                  encode_sequence_maxsz + \
 424                                  encode_putfh_maxsz + \
 425                                  encode_setattr_maxsz + \
 426                                  encode_getattr_maxsz)
 427 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
 428                                  decode_sequence_maxsz + \
 429                                  decode_putfh_maxsz + \
 430                                  decode_setattr_maxsz + \
 431                                  decode_getattr_maxsz)
 432 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
 433                                 encode_sequence_maxsz + \
 434                                 encode_putfh_maxsz + \
 435                                 encode_fsinfo_maxsz)
 436 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
 437                                 decode_sequence_maxsz + \
 438                                 decode_putfh_maxsz + \
 439                                 decode_fsinfo_maxsz)
 440 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
 441                                 encode_renew_maxsz)
 442 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
 443                                 decode_renew_maxsz)
 444 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
 445                                 encode_setclientid_maxsz)
 446 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
 447                                 decode_setclientid_maxsz)
 448 #define NFS4_enc_setclientid_confirm_sz \
 449                                 (compound_encode_hdr_maxsz + \
 450                                 encode_setclientid_confirm_maxsz + \
 451                                 encode_putrootfh_maxsz + \
 452                                 encode_fsinfo_maxsz)
 453 #define NFS4_dec_setclientid_confirm_sz \
 454                                 (compound_decode_hdr_maxsz + \
 455                                 decode_setclientid_confirm_maxsz + \
 456                                 decode_putrootfh_maxsz + \
 457                                 decode_fsinfo_maxsz)
 458 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
 459                                 encode_sequence_maxsz + \
 460                                 encode_putfh_maxsz + \
 461                                 encode_lock_maxsz)
 462 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
 463                                 decode_sequence_maxsz + \
 464                                 decode_putfh_maxsz + \
 465                                 decode_lock_maxsz)
 466 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
 467                                 encode_sequence_maxsz + \
 468                                 encode_putfh_maxsz + \
 469                                 encode_lockt_maxsz)
 470 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
 471                                  decode_sequence_maxsz + \
 472                                  decode_putfh_maxsz + \
 473                                  decode_lockt_maxsz)
 474 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
 475                                 encode_sequence_maxsz + \
 476                                 encode_putfh_maxsz + \
 477                                 encode_locku_maxsz)
 478 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
 479                                 decode_sequence_maxsz + \
 480                                 decode_putfh_maxsz + \
 481                                 decode_locku_maxsz)
 482 #define NFS4_enc_release_lockowner_sz \
 483                                 (compound_encode_hdr_maxsz + \
 484                                  encode_lockowner_maxsz)
 485 #define NFS4_dec_release_lockowner_sz \
 486                                 (compound_decode_hdr_maxsz + \
 487                                  decode_lockowner_maxsz)
 488 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
 489                                 encode_sequence_maxsz + \
 490                                 encode_putfh_maxsz + \
 491                                 encode_access_maxsz + \
 492                                 encode_getattr_maxsz)
 493 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
 494                                 decode_sequence_maxsz + \
 495                                 decode_putfh_maxsz + \
 496                                 decode_access_maxsz + \
 497                                 decode_getattr_maxsz)
 498 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
 499                                 encode_sequence_maxsz + \
 500                                 encode_putfh_maxsz + \
 501                                 encode_getattr_maxsz)
 502 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
 503                                 decode_sequence_maxsz + \
 504                                 decode_putfh_maxsz + \
 505                                 decode_getattr_maxsz)
 506 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
 507                                 encode_sequence_maxsz + \
 508                                 encode_putfh_maxsz + \
 509                                 encode_lookup_maxsz + \
 510                                 encode_getattr_maxsz + \
 511                                 encode_getfh_maxsz)
 512 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
 513                                 decode_sequence_maxsz + \
 514                                 decode_putfh_maxsz + \
 515                                 decode_lookup_maxsz + \
 516                                 decode_getattr_maxsz + \
 517                                 decode_getfh_maxsz)
 518 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
 519                                 encode_sequence_maxsz + \
 520                                 encode_putrootfh_maxsz + \
 521                                 encode_getattr_maxsz + \
 522                                 encode_getfh_maxsz)
 523 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
 524                                 decode_sequence_maxsz + \
 525                                 decode_putrootfh_maxsz + \
 526                                 decode_getattr_maxsz + \
 527                                 decode_getfh_maxsz)
 528 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
 529                                 encode_sequence_maxsz + \
 530                                 encode_putfh_maxsz + \
 531                                 encode_remove_maxsz + \
 532                                 encode_getattr_maxsz)
 533 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
 534                                 decode_sequence_maxsz + \
 535                                 decode_putfh_maxsz + \
 536                                 decode_remove_maxsz + \
 537                                 decode_getattr_maxsz)
 538 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
 539                                 encode_sequence_maxsz + \
 540                                 encode_putfh_maxsz + \
 541                                 encode_savefh_maxsz + \
 542                                 encode_putfh_maxsz + \
 543                                 encode_rename_maxsz + \
 544                                 encode_getattr_maxsz + \
 545                                 encode_restorefh_maxsz + \
 546                                 encode_getattr_maxsz)
 547 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
 548                                 decode_sequence_maxsz + \
 549                                 decode_putfh_maxsz + \
 550                                 decode_savefh_maxsz + \
 551                                 decode_putfh_maxsz + \
 552                                 decode_rename_maxsz + \
 553                                 decode_getattr_maxsz + \
 554                                 decode_restorefh_maxsz + \
 555                                 decode_getattr_maxsz)
 556 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
 557                                 encode_sequence_maxsz + \
 558                                 encode_putfh_maxsz + \
 559                                 encode_savefh_maxsz + \
 560                                 encode_putfh_maxsz + \
 561                                 encode_link_maxsz + \
 562                                 decode_getattr_maxsz + \
 563                                 encode_restorefh_maxsz + \
 564                                 decode_getattr_maxsz)
 565 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
 566                                 decode_sequence_maxsz + \
 567                                 decode_putfh_maxsz + \
 568                                 decode_savefh_maxsz + \
 569                                 decode_putfh_maxsz + \
 570                                 decode_link_maxsz + \
 571                                 decode_getattr_maxsz + \
 572                                 decode_restorefh_maxsz + \
 573                                 decode_getattr_maxsz)
 574 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
 575                                 encode_sequence_maxsz + \
 576                                 encode_putfh_maxsz + \
 577                                 encode_symlink_maxsz + \
 578                                 encode_getattr_maxsz + \
 579                                 encode_getfh_maxsz)
 580 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
 581                                 decode_sequence_maxsz + \
 582                                 decode_putfh_maxsz + \
 583                                 decode_symlink_maxsz + \
 584                                 decode_getattr_maxsz + \
 585                                 decode_getfh_maxsz)
 586 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
 587                                 encode_sequence_maxsz + \
 588                                 encode_putfh_maxsz + \
 589                                 encode_savefh_maxsz + \
 590                                 encode_create_maxsz + \
 591                                 encode_getfh_maxsz + \
 592                                 encode_getattr_maxsz + \
 593                                 encode_restorefh_maxsz + \
 594                                 encode_getattr_maxsz)
 595 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
 596                                 decode_sequence_maxsz + \
 597                                 decode_putfh_maxsz + \
 598                                 decode_savefh_maxsz + \
 599                                 decode_create_maxsz + \
 600                                 decode_getfh_maxsz + \
 601                                 decode_getattr_maxsz + \
 602                                 decode_restorefh_maxsz + \
 603                                 decode_getattr_maxsz)
 604 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
 605                                 encode_sequence_maxsz + \
 606                                 encode_putfh_maxsz + \
 607                                 encode_getattr_maxsz)
 608 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
 609                                 decode_sequence_maxsz + \
 610                                 decode_putfh_maxsz + \
 611                                 decode_getattr_maxsz)
 612 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
 613                                 encode_sequence_maxsz + \
 614                                 encode_putfh_maxsz + \
 615                                 encode_statfs_maxsz)
 616 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
 617                                 decode_sequence_maxsz + \
 618                                 decode_putfh_maxsz + \
 619                                 decode_statfs_maxsz)
 620 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
 621                                 encode_sequence_maxsz + \
 622                                 encode_putfh_maxsz + \
 623                                 encode_getattr_maxsz)
 624 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
 625                                 decode_sequence_maxsz + \
 626                                 decode_putfh_maxsz + \
 627                                 decode_getattr_maxsz)
 628 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
 629                                 encode_sequence_maxsz + \
 630                                 encode_putfh_maxsz + \
 631                                 encode_delegreturn_maxsz + \
 632                                 encode_getattr_maxsz)
 633 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
 634                                 decode_sequence_maxsz + \
 635                                 decode_delegreturn_maxsz + \
 636                                 decode_getattr_maxsz)
 637 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
 638                                 encode_sequence_maxsz + \
 639                                 encode_putfh_maxsz + \
 640                                 encode_getacl_maxsz)
 641 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
 642                                 decode_sequence_maxsz + \
 643                                 decode_putfh_maxsz + \
 644                                 decode_getacl_maxsz)
 645 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
 646                                 encode_sequence_maxsz + \
 647                                 encode_putfh_maxsz + \
 648                                 encode_setacl_maxsz)
 649 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
 650                                 decode_sequence_maxsz + \
 651                                 decode_putfh_maxsz + \
 652                                 decode_setacl_maxsz)
 653 #define NFS4_enc_fs_locations_sz \
 654                                 (compound_encode_hdr_maxsz + \
 655                                  encode_sequence_maxsz + \
 656                                  encode_putfh_maxsz + \
 657                                  encode_lookup_maxsz + \
 658                                  encode_fs_locations_maxsz)
 659 #define NFS4_dec_fs_locations_sz \
 660                                 (compound_decode_hdr_maxsz + \
 661                                  decode_sequence_maxsz + \
 662                                  decode_putfh_maxsz + \
 663                                  decode_lookup_maxsz + \
 664                                  decode_fs_locations_maxsz)
 665 #if defined(CONFIG_NFS_V4_1)
 666 #define NFS4_enc_exchange_id_sz \
 667                                 (compound_encode_hdr_maxsz + \
 668                                  encode_exchange_id_maxsz)
 669 #define NFS4_dec_exchange_id_sz \
 670                                 (compound_decode_hdr_maxsz + \
 671                                  decode_exchange_id_maxsz)
 672 #define NFS4_enc_create_session_sz \
 673                                 (compound_encode_hdr_maxsz + \
 674                                  encode_create_session_maxsz)
 675 #define NFS4_dec_create_session_sz \
 676                                 (compound_decode_hdr_maxsz + \
 677                                  decode_create_session_maxsz)
 678 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
 679                                          encode_destroy_session_maxsz)
 680 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
 681                                          decode_destroy_session_maxsz)
 682 #define NFS4_enc_sequence_sz \
 683                                 (compound_decode_hdr_maxsz + \
 684                                  encode_sequence_maxsz)
 685 #define NFS4_dec_sequence_sz \
 686                                 (compound_decode_hdr_maxsz + \
 687                                  decode_sequence_maxsz)
 688 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
 689                                          encode_sequence_maxsz + \
 690                                          encode_putrootfh_maxsz + \
 691                                          encode_fsinfo_maxsz)
 692 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
 693                                          decode_sequence_maxsz + \
 694                                          decode_putrootfh_maxsz + \
 695                                          decode_fsinfo_maxsz)
 696 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
 697                                          encode_sequence_maxsz + \
 698                                          encode_reclaim_complete_maxsz)
 699 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
 700                                          decode_sequence_maxsz + \
 701                                          decode_reclaim_complete_maxsz)
 702
 703 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 704                                       compound_encode_hdr_maxsz +
 705                                       encode_sequence_maxsz +
 706                                       encode_putfh_maxsz +
 707                                       encode_getattr_maxsz) *
 708                                      XDR_UNIT);
 709
 710 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 711                                      compound_decode_hdr_maxsz +
 712                                      decode_sequence_maxsz +
 713                                      decode_putfh_maxsz) *
 714                                     XDR_UNIT);
 715 #endif /* CONFIG_NFS_V4_1 */
 716
 717 static const umode_t nfs_type2fmt[] = {
 718         [NF4BAD] = 0,
 719         [NF4REG] = S_IFREG,
 720         [NF4DIR] = S_IFDIR,
 721         [NF4BLK] = S_IFBLK,
 722         [NF4CHR] = S_IFCHR,
 723         [NF4LNK] = S_IFLNK,
 724         [NF4SOCK] = S_IFSOCK,
 725         [NF4FIFO] = S_IFIFO,
 726         [NF4ATTRDIR] = 0,
 727         [NF4NAMEDATTR] = 0,
 728 };
 729
 730 struct compound_hdr {
 731         int32_t         status;
 732         uint32_t        nops;
 733         __be32 *        nops_p;
 734         uint32_t        taglen;
 735         char *          tag;
 736         uint32_t        replen;         /* expected reply words */
 737         u32             minorversion;
 738 };
 739
 740 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
 741 {
 742         __be32 *p = xdr_reserve_space(xdr, nbytes);
 743         BUG_ON(!p);
 744         return p;
 745 }
 746
 747 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
 748 {
 749         __be32 *p;
 750
 751         p = xdr_reserve_space(xdr, 4 + len);
 752         BUG_ON(p == NULL);
 753         xdr_encode_opaque(p, str, len);
 754 }
 755
 756 static void encode_compound_hdr(struct xdr_stream *xdr,
 757                                 struct rpc_rqst *req,
 758                                 struct compound_hdr *hdr)
 759 {
 760         __be32 *p;
 761         struct rpc_auth *auth = req->rq_cred->cr_auth;
 762
 763         /* initialize running count of expected bytes in reply.
 764          * NOTE: the replied tag SHOULD be the same is the one sent,
 765          * but this is not required as a MUST for the server to do so. */
 766         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
 767
 768         dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
 769         BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
 770         p = reserve_space(xdr, 4 + hdr->taglen + 8);
 771         p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);
 772         *p++ = cpu_to_be32(hdr->minorversion);
 773         hdr->nops_p = p;
 774         *p = cpu_to_be32(hdr->nops);
 775 }
 776
 777 static void encode_nops(struct compound_hdr *hdr)
 778 {
 779         BUG_ON(hdr->nops > NFS4_MAX_OPS);
 780         *hdr->nops_p = htonl(hdr->nops);
 781 }
 782
 783 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
 784 {
 785         __be32 *p;
 786
 787         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
 788         BUG_ON(p == NULL);
 789         xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
 790 }
 791
 792 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
 793 {
 794         char owner_name[IDMAP_NAMESZ];
 795         char owner_group[IDMAP_NAMESZ];
 796         int owner_namelen = 0;
 797         int owner_grouplen = 0;
 798         __be32 *p;
 799         __be32 *q;
 800         int len;
 801         uint32_t bmval0 = 0;
 802         uint32_t bmval1 = 0;
 803
 804         /*
 805          * We reserve enough space to write the entire attribute buffer at once.
 806          * In the worst-case, this would be
 807          *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
 808          *          = 36 bytes, plus any contribution from variable-length fields
 809          *            such as owner/group.
 810          */
 811         len = 16;
 812
 813         /* Sigh */
 814         if (iap->ia_valid & ATTR_SIZE)
 815                 len += 8;
 816         if (iap->ia_valid & ATTR_MODE)
 817                 len += 4;
 818         if (iap->ia_valid & ATTR_UID) {
 819                 owner_namelen = nfs_map_uid_to_name(server->nfs_client, iap->ia_uid, owner_name);
 820                 if (owner_namelen < 0) {
 821                         dprintk("nfs: couldn't resolve uid %d to string\n",
 822                                         iap->ia_uid);
 823                         /* XXX */
 824                         strcpy(owner_name, "nobody");
 825                         owner_namelen = sizeof("nobody") - 1;
 826                         /* goto out; */
 827                 }
 828                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
 829         }
 830         if (iap->ia_valid & ATTR_GID) {
 831                 owner_grouplen = nfs_map_gid_to_group(server->nfs_client, iap->ia_gid, owner_group);
 832                 if (owner_grouplen < 0) {
 833                         dprintk("nfs: couldn't resolve gid %d to string\n",
 834                                         iap->ia_gid);
 835                         strcpy(owner_group, "nobody");
 836                         owner_grouplen = sizeof("nobody") - 1;
 837                         /* goto out; */
 838                 }
 839                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
 840         }
 841         if (iap->ia_valid & ATTR_ATIME_SET)
 842                 len += 16;
 843         else if (iap->ia_valid & ATTR_ATIME)
 844                 len += 4;
 845         if (iap->ia_valid & ATTR_MTIME_SET)
 846                 len += 16;
 847         else if (iap->ia_valid & ATTR_MTIME)
 848                 len += 4;
 849         p = reserve_space(xdr, len);
 850
 851         /*
 852          * We write the bitmap length now, but leave the bitmap and the attribute
 853          * buffer length to be backfilled at the end of this routine.
 854          */
 855         *p++ = cpu_to_be32(2);
 856         q = p;
 857         p += 3;
 858
 859         if (iap->ia_valid & ATTR_SIZE) {
 860                 bmval0 |= FATTR4_WORD0_SIZE;
 861                 p = xdr_encode_hyper(p, iap->ia_size);
 862         }
 863         if (iap->ia_valid & ATTR_MODE) {
 864                 bmval1 |= FATTR4_WORD1_MODE;
 865                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
 866         }
 867         if (iap->ia_valid & ATTR_UID) {
 868                 bmval1 |= FATTR4_WORD1_OWNER;
 869                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
 870         }
 871         if (iap->ia_valid & ATTR_GID) {
 872                 bmval1 |= FATTR4_WORD1_OWNER_GROUP;
 873                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
 874         }
 875         if (iap->ia_valid & ATTR_ATIME_SET) {
 876                 bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
 877                 *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
 878                 *p++ = cpu_to_be32(0);
 879                 *p++ = cpu_to_be32(iap->ia_atime.tv_sec);
 880                 *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
 881         }
 882         else if (iap->ia_valid & ATTR_ATIME) {
 883                 bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
 884                 *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
 885         }
 886         if (iap->ia_valid & ATTR_MTIME_SET) {
 887                 bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
 888                 *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
 889                 *p++ = cpu_to_be32(0);
 890                 *p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
 891                 *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
 892         }
 893         else if (iap->ia_valid & ATTR_MTIME) {
 894                 bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
 895                 *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
 896         }
 897
 898         /*
 899          * Now we backfill the bitmap and the attribute buffer length.
 900          */
 901         if (len != ((char *)p - (char *)q) + 4) {
 902                 printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
 903                                 len, ((char *)p - (char *)q) + 4);
 904                 BUG();
 905         }
 906         len = (char *)p - (char *)q - 12;
 907         *q++ = htonl(bmval0);
 908         *q++ = htonl(bmval1);
 909         *q = htonl(len);
 910
 911 /* out: */
 912 }
 913
 914 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
 915 {
 916         __be32 *p;
 917
 918         p = reserve_space(xdr, 8);
 919         *p++ = cpu_to_be32(OP_ACCESS);
 920         *p = cpu_to_be32(access);
 921         hdr->nops++;
 922         hdr->replen += decode_access_maxsz;
 923 }
 924
 925 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
 926 {
 927         __be32 *p;
 928
 929         p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
 930         *p++ = cpu_to_be32(OP_CLOSE);
 931         *p++ = cpu_to_be32(arg->seqid->sequence->counter);
 932         xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
 933         hdr->nops++;
 934         hdr->replen += decode_close_maxsz;
 935 }
 936
 937 static void encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
 938 {
 939         __be32 *p;
 940
 941         p = reserve_space(xdr, 16);
 942         *p++ = cpu_to_be32(OP_COMMIT);
 943         p = xdr_encode_hyper(p, args->offset);
 944         *p = cpu_to_be32(args->count);
 945         hdr->nops++;
 946         hdr->replen += decode_commit_maxsz;
 947 }
 948
 949 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
 950 {
 951         __be32 *p;
 952
 953         p = reserve_space(xdr, 8);
 954         *p++ = cpu_to_be32(OP_CREATE);
 955         *p = cpu_to_be32(create->ftype);
 956
 957         switch (create->ftype) {
 958         case NF4LNK:
 959                 p = reserve_space(xdr, 4);
 960                 *p = cpu_to_be32(create->u.symlink.len);
 961                 xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
 962                 break;
 963
 964         case NF4BLK: case NF4CHR:
 965                 p = reserve_space(xdr, 8);
 966                 *p++ = cpu_to_be32(create->u.device.specdata1);
 967                 *p = cpu_to_be32(create->u.device.specdata2);
 968                 break;
 969
 970         default:
 971                 break;
 972         }
 973
 974         encode_string(xdr, create->name->len, create->name->name);
 975         hdr->nops++;
 976         hdr->replen += decode_create_maxsz;
 977
 978         encode_attrs(xdr, create->attrs, create->server);
 979 }
 980
 981 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
 982 {
 983         __be32 *p;
 984
 985         p = reserve_space(xdr, 12);
 986         *p++ = cpu_to_be32(OP_GETATTR);
 987         *p++ = cpu_to_be32(1);
 988         *p = cpu_to_be32(bitmap);
 989         hdr->nops++;
 990         hdr->replen += decode_getattr_maxsz;
 991 }
 992
 993 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
 994 {
 995         __be32 *p;
 996
 997         p = reserve_space(xdr, 16);
 998         *p++ = cpu_to_be32(OP_GETATTR);
 999         *p++ = cpu_to_be32(2);
1000         *p++ = cpu_to_be32(bm0);
1001         *p = cpu_to_be32(bm1);
1002         hdr->nops++;
1003         hdr->replen += decode_getattr_maxsz;
1004 }
1005
1006 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1007 {
1008         encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1009                            bitmask[1] & nfs4_fattr_bitmap[1], hdr);
1010 }
1011
1012 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1013 {
1014         encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],
1015                            bitmask[1] & nfs4_fsinfo_bitmap[1], hdr);
1016 }
1017
1018 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1019 {
1020         encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1021                            bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1022 }
1023
1024 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1025 {
1026         __be32 *p;
1027
1028         p = reserve_space(xdr, 4);
1029         *p = cpu_to_be32(OP_GETFH);
1030         hdr->nops++;
1031         hdr->replen += decode_getfh_maxsz;
1032 }
1033
1034 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1035 {
1036         __be32 *p;
1037
1038         p = reserve_space(xdr, 8 + name->len);
1039         *p++ = cpu_to_be32(OP_LINK);
1040         xdr_encode_opaque(p, name->name, name->len);
1041         hdr->nops++;
1042         hdr->replen += decode_link_maxsz;
1043 }
1044
1045 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1046 {
1047         if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
1048                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1049         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1050 }
1051
1052 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1053 {
1054         if (fl->fl_end == OFFSET_MAX)
1055                 return ~(uint64_t)0;
1056         return fl->fl_end - fl->fl_start + 1;
1057 }
1058
1059 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1060 {
1061         __be32 *p;
1062
1063         p = reserve_space(xdr, 28);
1064         p = xdr_encode_hyper(p, lowner->clientid);
1065         *p++ = cpu_to_be32(16);
1066         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1067         xdr_encode_hyper(p, lowner->id);
1068 }
1069
1070 /*
1071  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1072  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1073  */
1074 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1075 {
1076         __be32 *p;
1077
1078         p = reserve_space(xdr, 32);
1079         *p++ = cpu_to_be32(OP_LOCK);
1080         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1081         *p++ = cpu_to_be32(args->reclaim);
1082         p = xdr_encode_hyper(p, args->fl->fl_start);
1083         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1084         *p = cpu_to_be32(args->new_lock_owner);
1085         if (args->new_lock_owner){
1086                 p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1087                 *p++ = cpu_to_be32(args->open_seqid->sequence->counter);
1088                 p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
1089                 *p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
1090                 encode_lockowner(xdr, &args->lock_owner);
1091         }
1092         else {
1093                 p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
1094                 p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
1095                 *p = cpu_to_be32(args->lock_seqid->sequence->counter);
1096         }
1097         hdr->nops++;
1098         hdr->replen += decode_lock_maxsz;
1099 }
1100
1101 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1102 {
1103         __be32 *p;
1104
1105         p = reserve_space(xdr, 24);
1106         *p++ = cpu_to_be32(OP_LOCKT);
1107         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1108         p = xdr_encode_hyper(p, args->fl->fl_start);
1109         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1110         encode_lockowner(xdr, &args->lock_owner);
1111         hdr->nops++;
1112         hdr->replen += decode_lockt_maxsz;
1113 }
1114
1115 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1116 {
1117         __be32 *p;
1118
1119         p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
1120         *p++ = cpu_to_be32(OP_LOCKU);
1121         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1122         *p++ = cpu_to_be32(args->seqid->sequence->counter);
1123         p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
1124         p = xdr_encode_hyper(p, args->fl->fl_start);
1125         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1126         hdr->nops++;
1127         hdr->replen += decode_locku_maxsz;
1128 }
1129
1130 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1131 {
1132         __be32 *p;
1133
1134         p = reserve_space(xdr, 4);
1135         *p = cpu_to_be32(OP_RELEASE_LOCKOWNER);
1136         encode_lockowner(xdr, lowner);
1137         hdr->nops++;
1138         hdr->replen += decode_release_lockowner_maxsz;
1139 }
1140
1141 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1142 {
1143         int len = name->len;
1144         __be32 *p;
1145
1146         p = reserve_space(xdr, 8 + len);
1147         *p++ = cpu_to_be32(OP_LOOKUP);
1148         xdr_encode_opaque(p, name->name, len);
1149         hdr->nops++;
1150         hdr->replen += decode_lookup_maxsz;
1151 }
1152
1153 static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
1154 {
1155         __be32 *p;
1156
1157         p = reserve_space(xdr, 8);
1158         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1159         case FMODE_READ:
1160                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
1161                 break;
1162         case FMODE_WRITE:
1163                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
1164                 break;
1165         case FMODE_READ|FMODE_WRITE:
1166                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
1167                 break;
1168         default:
1169                 *p++ = cpu_to_be32(0);
1170         }
1171         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1172 }
1173
1174 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1175 {
1176         __be32 *p;
1177  /*
1178  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1179  * owner 4 = 32
1180  */
1181         p = reserve_space(xdr, 8);
1182         *p++ = cpu_to_be32(OP_OPEN);
1183         *p = cpu_to_be32(arg->seqid->sequence->counter);
1184         encode_share_access(xdr, arg->fmode);
1185         p = reserve_space(xdr, 28);
1186         p = xdr_encode_hyper(p, arg->clientid);
1187         *p++ = cpu_to_be32(16);
1188         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1189         xdr_encode_hyper(p, arg->id);
1190 }
1191
1192 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1193 {
1194         __be32 *p;
1195         struct nfs_client *clp;
1196
1197         p = reserve_space(xdr, 4);
1198         switch(arg->open_flags & O_EXCL) {
1199         case 0:
1200                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1201                 encode_attrs(xdr, arg->u.attrs, arg->server);
1202                 break;
1203         default:
1204                 clp = arg->server->nfs_client;
1205                 if (clp->cl_mvops->minor_version > 0) {
1206                         if (nfs4_has_persistent_session(clp)) {
1207                                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1208                                 encode_attrs(xdr, arg->u.attrs, arg->server);
1209                         } else {
1210                                 struct iattr dummy;
1211
1212                                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1213                                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1214                                 dummy.ia_valid = 0;
1215                                 encode_attrs(xdr, &dummy, arg->server);
1216                         }
1217                 } else {
1218                         *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1219                         encode_nfs4_verifier(xdr, &arg->u.verifier);
1220                 }
1221         }
1222 }
1223
1224 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1225 {
1226         __be32 *p;
1227
1228         p = reserve_space(xdr, 4);
1229         switch (arg->open_flags & O_CREAT) {
1230         case 0:
1231                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1232                 break;
1233         default:
1234                 BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
1235                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1236                 encode_createmode(xdr, arg);
1237         }
1238 }
1239
1240 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1241 {
1242         __be32 *p;
1243
1244         p = reserve_space(xdr, 4);
1245         switch (delegation_type) {
1246         case 0:
1247                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1248                 break;
1249         case FMODE_READ:
1250                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1251                 break;
1252         case FMODE_WRITE|FMODE_READ:
1253                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1254                 break;
1255         default:
1256                 BUG();
1257         }
1258 }
1259
1260 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1261 {
1262         __be32 *p;
1263
1264         p = reserve_space(xdr, 4);
1265         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1266         encode_string(xdr, name->len, name->name);
1267 }
1268
1269 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1270 {
1271         __be32 *p;
1272
1273         p = reserve_space(xdr, 4);
1274         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1275         encode_delegation_type(xdr, type);
1276 }
1277
1278 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1279 {
1280         __be32 *p;
1281
1282         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1283         *p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1284         xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1285         encode_string(xdr, name->len, name->name);
1286 }
1287
1288 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1289 {
1290         encode_openhdr(xdr, arg);
1291         encode_opentype(xdr, arg);
1292         switch (arg->claim) {
1293         case NFS4_OPEN_CLAIM_NULL:
1294                 encode_claim_null(xdr, arg->name);
1295                 break;
1296         case NFS4_OPEN_CLAIM_PREVIOUS:
1297                 encode_claim_previous(xdr, arg->u.delegation_type);
1298                 break;
1299         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1300                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1301                 break;
1302         default:
1303                 BUG();
1304         }
1305         hdr->nops++;
1306         hdr->replen += decode_open_maxsz;
1307 }
1308
1309 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1310 {
1311         __be32 *p;
1312
1313         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1314         *p++ = cpu_to_be32(OP_OPEN_CONFIRM);
1315         p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1316         *p = cpu_to_be32(arg->seqid->sequence->counter);
1317         hdr->nops++;
1318         hdr->replen += decode_open_confirm_maxsz;
1319 }
1320
1321 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1322 {
1323         __be32 *p;
1324
1325         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1326         *p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
1327         p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1328         *p = cpu_to_be32(arg->seqid->sequence->counter);
1329         encode_share_access(xdr, arg->fmode);
1330         hdr->nops++;
1331         hdr->replen += decode_open_downgrade_maxsz;
1332 }
1333
1334 static void
1335 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1336 {
1337         int len = fh->size;
1338         __be32 *p;
1339
1340         p = reserve_space(xdr, 8 + len);
1341         *p++ = cpu_to_be32(OP_PUTFH);
1342         xdr_encode_opaque(p, fh->data, len);
1343         hdr->nops++;
1344         hdr->replen += decode_putfh_maxsz;
1345 }
1346
1347 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1348 {
1349         __be32 *p;
1350
1351         p = reserve_space(xdr, 4);
1352         *p = cpu_to_be32(OP_PUTROOTFH);
1353         hdr->nops++;
1354         hdr->replen += decode_putrootfh_maxsz;
1355 }
1356
1357 static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx, const struct nfs_lock_context *l_ctx)
1358 {
1359         nfs4_stateid stateid;
1360         __be32 *p;
1361
1362         p = reserve_space(xdr, NFS4_STATEID_SIZE);
1363         if (ctx->state != NULL) {
1364                 nfs4_copy_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
1365                 xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
1366         } else
1367                 xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1368 }
1369
1370 static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
1371 {
1372         __be32 *p;
1373
1374         p = reserve_space(xdr, 4);
1375         *p = cpu_to_be32(OP_READ);
1376
1377         encode_stateid(xdr, args->context, args->lock_context);
1378
1379         p = reserve_space(xdr, 12);
1380         p = xdr_encode_hyper(p, args->offset);
1381         *p = cpu_to_be32(args->count);
1382         hdr->nops++;
1383         hdr->replen += decode_read_maxsz;
1384 }
1385
1386 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1387 {
1388         uint32_t attrs[2] = {
1389                 FATTR4_WORD0_RDATTR_ERROR|FATTR4_WORD0_FILEID,
1390                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1391         };
1392         __be32 *p;
1393
1394         p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
1395         *p++ = cpu_to_be32(OP_READDIR);
1396         p = xdr_encode_hyper(p, readdir->cookie);
1397         p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
1398         *p++ = cpu_to_be32(readdir->count >> 1);  /* We're not doing readdirplus */
1399         *p++ = cpu_to_be32(readdir->count);
1400         *p++ = cpu_to_be32(2);
1401         /* Switch to mounted_on_fileid if the server supports it */
1402         if (readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
1403                 attrs[0] &= ~FATTR4_WORD0_FILEID;
1404         else
1405                 attrs[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
1406         *p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
1407         *p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
1408         hdr->nops++;
1409         hdr->replen += decode_readdir_maxsz;
1410         dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
1411                         __func__,
1412                         (unsigned long long)readdir->cookie,
1413                         ((u32 *)readdir->verifier.data)[0],
1414                         ((u32 *)readdir->verifier.data)[1],
1415                         attrs[0] & readdir->bitmask[0],
1416                         attrs[1] & readdir->bitmask[1]);
1417 }
1418
1419 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1420 {
1421         __be32 *p;
1422
1423         p = reserve_space(xdr, 4);
1424         *p = cpu_to_be32(OP_READLINK);
1425         hdr->nops++;
1426         hdr->replen += decode_readlink_maxsz;
1427 }
1428
1429 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1430 {
1431         __be32 *p;
1432
1433         p = reserve_space(xdr, 8 + name->len);
1434         *p++ = cpu_to_be32(OP_REMOVE);
1435         xdr_encode_opaque(p, name->name, name->len);
1436         hdr->nops++;
1437         hdr->replen += decode_remove_maxsz;
1438 }
1439
1440 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1441 {
1442         __be32 *p;
1443
1444         p = reserve_space(xdr, 4);
1445         *p = cpu_to_be32(OP_RENAME);
1446         encode_string(xdr, oldname->len, oldname->name);
1447         encode_string(xdr, newname->len, newname->name);
1448         hdr->nops++;
1449         hdr->replen += decode_rename_maxsz;
1450 }
1451
1452 static void encode_renew(struct xdr_stream *xdr, const struct nfs_client *client_stateid, struct compound_hdr *hdr)
1453 {
1454         __be32 *p;
1455
1456         p = reserve_space(xdr, 12);
1457         *p++ = cpu_to_be32(OP_RENEW);
1458         xdr_encode_hyper(p, client_stateid->cl_clientid);
1459         hdr->nops++;
1460         hdr->replen += decode_renew_maxsz;
1461 }
1462
1463 static void
1464 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1465 {
1466         __be32 *p;
1467
1468         p = reserve_space(xdr, 4);
1469         *p = cpu_to_be32(OP_RESTOREFH);
1470         hdr->nops++;
1471         hdr->replen += decode_restorefh_maxsz;
1472 }
1473
1474 static int
1475 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1476 {
1477         __be32 *p;
1478
1479         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1480         *p++ = cpu_to_be32(OP_SETATTR);
1481         xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1482         p = reserve_space(xdr, 2*4);
1483         *p++ = cpu_to_be32(1);
1484         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1485         if (arg->acl_len % 4)
1486                 return -EINVAL;
1487         p = reserve_space(xdr, 4);
1488         *p = cpu_to_be32(arg->acl_len);
1489         xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1490         hdr->nops++;
1491         hdr->replen += decode_setacl_maxsz;
1492         return 0;
1493 }
1494
1495 static void
1496 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1497 {
1498         __be32 *p;
1499
1500         p = reserve_space(xdr, 4);
1501         *p = cpu_to_be32(OP_SAVEFH);
1502         hdr->nops++;
1503         hdr->replen += decode_savefh_maxsz;
1504 }
1505
1506 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1507 {
1508         __be32 *p;
1509
1510         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1511         *p++ = cpu_to_be32(OP_SETATTR);
1512         xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
1513         hdr->nops++;
1514         hdr->replen += decode_setattr_maxsz;
1515         encode_attrs(xdr, arg->iap, server);
1516 }
1517
1518 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1519 {
1520         __be32 *p;
1521
1522         p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
1523         *p++ = cpu_to_be32(OP_SETCLIENTID);
1524         xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);
1525
1526         encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1527         p = reserve_space(xdr, 4);
1528         *p = cpu_to_be32(setclientid->sc_prog);
1529         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1530         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1531         p = reserve_space(xdr, 4);
1532         *p = cpu_to_be32(setclientid->sc_cb_ident);
1533         hdr->nops++;
1534         hdr->replen += decode_setclientid_maxsz;
1535 }
1536
1537 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1538 {
1539         __be32 *p;
1540
1541         p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
1542         *p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
1543         p = xdr_encode_hyper(p, arg->clientid);
1544         xdr_encode_opaque_fixed(p, arg->confirm.data, NFS4_VERIFIER_SIZE);
1545         hdr->nops++;
1546         hdr->replen += decode_setclientid_confirm_maxsz;
1547 }
1548
1549 static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1550 {
1551         __be32 *p;
1552
1553         p = reserve_space(xdr, 4);
1554         *p = cpu_to_be32(OP_WRITE);
1555
1556         encode_stateid(xdr, args->context, args->lock_context);
1557
1558         p = reserve_space(xdr, 16);
1559         p = xdr_encode_hyper(p, args->offset);
1560         *p++ = cpu_to_be32(args->stable);
1561         *p = cpu_to_be32(args->count);
1562
1563         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1564         hdr->nops++;
1565         hdr->replen += decode_write_maxsz;
1566 }
1567
1568 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1569 {
1570         __be32 *p;
1571
1572         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1573
1574         *p++ = cpu_to_be32(OP_DELEGRETURN);
1575         xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1576         hdr->nops++;
1577         hdr->replen += decode_delegreturn_maxsz;
1578 }
1579
1580 #if defined(CONFIG_NFS_V4_1)
1581 /* NFSv4.1 operations */
1582 static void encode_exchange_id(struct xdr_stream *xdr,
1583                                struct nfs41_exchange_id_args *args,
1584                                struct compound_hdr *hdr)
1585 {
1586         __be32 *p;
1587
1588         p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
1589         *p++ = cpu_to_be32(OP_EXCHANGE_ID);
1590         xdr_encode_opaque_fixed(p, args->verifier->data, sizeof(args->verifier->data));
1591
1592         encode_string(xdr, args->id_len, args->id);
1593
1594         p = reserve_space(xdr, 12);
1595         *p++ = cpu_to_be32(args->flags);
1596         *p++ = cpu_to_be32(0);  /* zero length state_protect4_a */
1597         *p = cpu_to_be32(0);    /* zero length implementation id array */
1598         hdr->nops++;
1599         hdr->replen += decode_exchange_id_maxsz;
1600 }
1601
1602 static void encode_create_session(struct xdr_stream *xdr,
1603                                   struct nfs41_create_session_args *args,
1604                                   struct compound_hdr *hdr)
1605 {
1606         __be32 *p;
1607         char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
1608         uint32_t len;
1609         struct nfs_client *clp = args->client;
1610         u32 max_resp_sz_cached;
1611
1612         /*
1613          * Assumes OPEN is the biggest non-idempotent compound.
1614          * 2 is the verifier.
1615          */
1616         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1617                               RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1618
1619         len = scnprintf(machine_name, sizeof(machine_name), "%s",
1620                         clp->cl_ipaddr);
1621
1622         p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
1623         *p++ = cpu_to_be32(OP_CREATE_SESSION);
1624         p = xdr_encode_hyper(p, clp->cl_ex_clid);
1625         *p++ = cpu_to_be32(clp->cl_seqid);                      /*Sequence id */
1626         *p++ = cpu_to_be32(args->flags);                        /*flags */
1627
1628         /* Fore Channel */
1629         *p++ = cpu_to_be32(args->fc_attrs.headerpadsz); /* header padding size */
1630         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1631         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1632         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1633         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1634         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1635         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1636
1637         /* Back Channel */
1638         *p++ = cpu_to_be32(args->fc_attrs.headerpadsz); /* header padding size */
1639         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1640         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1641         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1642         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1643         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1644         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1645
1646         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1647         *p++ = cpu_to_be32(1);
1648         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1649
1650         /* authsys_parms rfc1831 */
1651         *p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);     /* stamp */
1652         p = xdr_encode_opaque(p, machine_name, len);
1653         *p++ = cpu_to_be32(0);                          /* UID */
1654         *p++ = cpu_to_be32(0);                          /* GID */
1655         *p = cpu_to_be32(0);                            /* No more gids */
1656         hdr->nops++;
1657         hdr->replen += decode_create_session_maxsz;
1658 }
1659
1660 static void encode_destroy_session(struct xdr_stream *xdr,
1661                                    struct nfs4_session *session,
1662                                    struct compound_hdr *hdr)
1663 {
1664         __be32 *p;
1665         p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
1666         *p++ = cpu_to_be32(OP_DESTROY_SESSION);
1667         xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1668         hdr->nops++;
1669         hdr->replen += decode_destroy_session_maxsz;
1670 }
1671
1672 static void encode_reclaim_complete(struct xdr_stream *xdr,
1673                                     struct nfs41_reclaim_complete_args *args,
1674                                     struct compound_hdr *hdr)
1675 {
1676         __be32 *p;
1677
1678         p = reserve_space(xdr, 8);
1679         *p++ = cpu_to_be32(OP_RECLAIM_COMPLETE);
1680         *p++ = cpu_to_be32(args->one_fs);
1681         hdr->nops++;
1682         hdr->replen += decode_reclaim_complete_maxsz;
1683 }
1684 #endif /* CONFIG_NFS_V4_1 */
1685
1686 static void encode_sequence(struct xdr_stream *xdr,
1687                             const struct nfs4_sequence_args *args,
1688                             struct compound_hdr *hdr)
1689 {
1690 #if defined(CONFIG_NFS_V4_1)
1691         struct nfs4_session *session = args->sa_session;
1692         struct nfs4_slot_table *tp;
1693         struct nfs4_slot *slot;
1694         __be32 *p;
1695
1696         if (!session)
1697                 return;
1698
1699         tp = &session->fc_slot_table;
1700
1701         WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
1702         slot = tp->slots + args->sa_slotid;
1703
1704         p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
1705         *p++ = cpu_to_be32(OP_SEQUENCE);
1706
1707         /*
1708          * Sessionid + seqid + slotid + max slotid + cache_this
1709          */
1710         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1711                 "max_slotid=%d cache_this=%d\n",
1712                 __func__,
1713                 ((u32 *)session->sess_id.data)[0],
1714                 ((u32 *)session->sess_id.data)[1],
1715                 ((u32 *)session->sess_id.data)[2],
1716                 ((u32 *)session->sess_id.data)[3],
1717                 slot->seq_nr, args->sa_slotid,
1718                 tp->highest_used_slotid, args->sa_cache_this);
1719         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1720         *p++ = cpu_to_be32(slot->seq_nr);
1721         *p++ = cpu_to_be32(args->sa_slotid);
1722         *p++ = cpu_to_be32(tp->highest_used_slotid);
1723         *p = cpu_to_be32(args->sa_cache_this);
1724         hdr->nops++;
1725         hdr->replen += decode_sequence_maxsz;
1726 #endif /* CONFIG_NFS_V4_1 */
1727 }
1728
1729 /*
1730  * END OF "GENERIC" ENCODE ROUTINES.
1731  */
1732
1733 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
1734 {
1735 #if defined(CONFIG_NFS_V4_1)
1736         if (args->sa_session)
1737                 return args->sa_session->clp->cl_mvops->minor_version;
1738 #endif /* CONFIG_NFS_V4_1 */
1739         return 0;
1740 }
1741
1742 /*
1743  * Encode an ACCESS request
1744  */
1745 static int nfs4_xdr_enc_access(struct rpc_rqst *req, __be32 *p, const struct nfs4_accessargs *args)
1746 {
1747         struct xdr_stream xdr;
1748         struct compound_hdr hdr = {
1749                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1750         };
1751
1752         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1753         encode_compound_hdr(&xdr, req, &hdr);
1754         encode_sequence(&xdr, &args->seq_args, &hdr);
1755         encode_putfh(&xdr, args->fh, &hdr);
1756         encode_access(&xdr, args->access, &hdr);
1757         encode_getfattr(&xdr, args->bitmask, &hdr);
1758         encode_nops(&hdr);
1759         return 0;
1760 }
1761
1762 /*
1763  * Encode LOOKUP request
1764  */
1765 static int nfs4_xdr_enc_lookup(struct rpc_rqst *req, __be32 *p, const struct nfs4_lookup_arg *args)
1766 {
1767         struct xdr_stream xdr;
1768         struct compound_hdr hdr = {
1769                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1770         };
1771
1772         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1773         encode_compound_hdr(&xdr, req, &hdr);
1774         encode_sequence(&xdr, &args->seq_args, &hdr);
1775         encode_putfh(&xdr, args->dir_fh, &hdr);
1776         encode_lookup(&xdr, args->name, &hdr);
1777         encode_getfh(&xdr, &hdr);
1778         encode_getfattr(&xdr, args->bitmask, &hdr);
1779         encode_nops(&hdr);
1780         return 0;
1781 }
1782
1783 /*
1784  * Encode LOOKUP_ROOT request
1785  */
1786 static int nfs4_xdr_enc_lookup_root(struct rpc_rqst *req, __be32 *p, const struct nfs4_lookup_root_arg *args)
1787 {
1788         struct xdr_stream xdr;
1789         struct compound_hdr hdr = {
1790                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1791         };
1792
1793         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1794         encode_compound_hdr(&xdr, req, &hdr);
1795         encode_sequence(&xdr, &args->seq_args, &hdr);
1796         encode_putrootfh(&xdr, &hdr);
1797         encode_getfh(&xdr, &hdr);
1798         encode_getfattr(&xdr, args->bitmask, &hdr);
1799         encode_nops(&hdr);
1800         return 0;
1801 }
1802
1803 /*
1804  * Encode REMOVE request
1805  */
1806 static int nfs4_xdr_enc_remove(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
1807 {
1808         struct xdr_stream xdr;
1809         struct compound_hdr hdr = {
1810                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1811         };
1812
1813         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1814         encode_compound_hdr(&xdr, req, &hdr);
1815         encode_sequence(&xdr, &args->seq_args, &hdr);
1816         encode_putfh(&xdr, args->fh, &hdr);
1817         encode_remove(&xdr, &args->name, &hdr);
1818         encode_getfattr(&xdr, args->bitmask, &hdr);
1819         encode_nops(&hdr);
1820         return 0;
1821 }
1822
1823 /*
1824  * Encode RENAME request
1825  */
1826 static int nfs4_xdr_enc_rename(struct rpc_rqst *req, __be32 *p, const struct nfs4_rename_arg *args)
1827 {
1828         struct xdr_stream xdr;
1829         struct compound_hdr hdr = {
1830                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1831         };
1832
1833         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1834         encode_compound_hdr(&xdr, req, &hdr);
1835         encode_sequence(&xdr, &args->seq_args, &hdr);
1836         encode_putfh(&xdr, args->old_dir, &hdr);
1837         encode_savefh(&xdr, &hdr);
1838         encode_putfh(&xdr, args->new_dir, &hdr);
1839         encode_rename(&xdr, args->old_name, args->new_name, &hdr);
1840         encode_getfattr(&xdr, args->bitmask, &hdr);
1841         encode_restorefh(&xdr, &hdr);
1842         encode_getfattr(&xdr, args->bitmask, &hdr);
1843         encode_nops(&hdr);
1844         return 0;
1845 }
1846
1847 /*
1848  * Encode LINK request
1849  */
1850 static int nfs4_xdr_enc_link(struct rpc_rqst *req, __be32 *p, const struct nfs4_link_arg *args)
1851 {
1852         struct xdr_stream xdr;
1853         struct compound_hdr hdr = {
1854                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1855         };
1856
1857         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1858         encode_compound_hdr(&xdr, req, &hdr);
1859         encode_sequence(&xdr, &args->seq_args, &hdr);
1860         encode_putfh(&xdr, args->fh, &hdr);
1861         encode_savefh(&xdr, &hdr);
1862         encode_putfh(&xdr, args->dir_fh, &hdr);
1863         encode_link(&xdr, args->name, &hdr);
1864         encode_getfattr(&xdr, args->bitmask, &hdr);
1865         encode_restorefh(&xdr, &hdr);
1866         encode_getfattr(&xdr, args->bitmask, &hdr);
1867         encode_nops(&hdr);
1868         return 0;
1869 }
1870
1871 /*
1872  * Encode CREATE request
1873  */
1874 static int nfs4_xdr_enc_create(struct rpc_rqst *req, __be32 *p, const struct nfs4_create_arg *args)
1875 {
1876         struct xdr_stream xdr;
1877         struct compound_hdr hdr = {
1878                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1879         };
1880
1881         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1882         encode_compound_hdr(&xdr, req, &hdr);
1883         encode_sequence(&xdr, &args->seq_args, &hdr);
1884         encode_putfh(&xdr, args->dir_fh, &hdr);
1885         encode_savefh(&xdr, &hdr);
1886         encode_create(&xdr, args, &hdr);
1887         encode_getfh(&xdr, &hdr);
1888         encode_getfattr(&xdr, args->bitmask, &hdr);
1889         encode_restorefh(&xdr, &hdr);
1890         encode_getfattr(&xdr, args->bitmask, &hdr);
1891         encode_nops(&hdr);
1892         return 0;
1893 }
1894
1895 /*
1896  * Encode SYMLINK request
1897  */
1898 static int nfs4_xdr_enc_symlink(struct rpc_rqst *req, __be32 *p, const struct nfs4_create_arg *args)
1899 {
1900         return nfs4_xdr_enc_create(req, p, args);
1901 }
1902
1903 /*
1904  * Encode GETATTR request
1905  */
1906 static int nfs4_xdr_enc_getattr(struct rpc_rqst *req, __be32 *p, const struct nfs4_getattr_arg *args)
1907 {
1908         struct xdr_stream xdr;
1909         struct compound_hdr hdr = {
1910                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1911         };
1912
1913         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1914         encode_compound_hdr(&xdr, req, &hdr);
1915         encode_sequence(&xdr, &args->seq_args, &hdr);
1916         encode_putfh(&xdr, args->fh, &hdr);
1917         encode_getfattr(&xdr, args->bitmask, &hdr);
1918         encode_nops(&hdr);
1919         return 0;
1920 }
1921
1922 /*
1923  * Encode a CLOSE request
1924  */
1925 static int nfs4_xdr_enc_close(struct rpc_rqst *req, __be32 *p, struct nfs_closeargs *args)
1926 {
1927         struct xdr_stream xdr;
1928         struct compound_hdr hdr = {
1929                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1930         };
1931
1932         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1933         encode_compound_hdr(&xdr, req, &hdr);
1934         encode_sequence(&xdr, &args->seq_args, &hdr);
1935         encode_putfh(&xdr, args->fh, &hdr);
1936         encode_close(&xdr, args, &hdr);
1937         encode_getfattr(&xdr, args->bitmask, &hdr);
1938         encode_nops(&hdr);
1939         return 0;
1940 }
1941
1942 /*
1943  * Encode an OPEN request
1944  */
1945 static int nfs4_xdr_enc_open(struct rpc_rqst *req, __be32 *p, struct nfs_openargs *args)
1946 {
1947         struct xdr_stream xdr;
1948         struct compound_hdr hdr = {
1949                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1950         };
1951
1952         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1953         encode_compound_hdr(&xdr, req, &hdr);
1954         encode_sequence(&xdr, &args->seq_args, &hdr);
1955         encode_putfh(&xdr, args->fh, &hdr);
1956         encode_savefh(&xdr, &hdr);
1957         encode_open(&xdr, args, &hdr);
1958         encode_getfh(&xdr, &hdr);
1959         encode_getfattr(&xdr, args->bitmask, &hdr);
1960         encode_restorefh(&xdr, &hdr);
1961         encode_getfattr(&xdr, args->bitmask, &hdr);
1962         encode_nops(&hdr);
1963         return 0;
1964 }
1965
1966 /*
1967  * Encode an OPEN_CONFIRM request
1968  */
1969 static int nfs4_xdr_enc_open_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_open_confirmargs *args)
1970 {
1971         struct xdr_stream xdr;
1972         struct compound_hdr hdr = {
1973                 .nops   = 0,
1974         };
1975
1976         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1977         encode_compound_hdr(&xdr, req, &hdr);
1978         encode_putfh(&xdr, args->fh, &hdr);
1979         encode_open_confirm(&xdr, args, &hdr);
1980         encode_nops(&hdr);
1981         return 0;
1982 }
1983
1984 /*
1985  * Encode an OPEN request with no attributes.
1986  */
1987 static int nfs4_xdr_enc_open_noattr(struct rpc_rqst *req, __be32 *p, struct nfs_openargs *args)
1988 {
1989         struct xdr_stream xdr;
1990         struct compound_hdr hdr = {
1991                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1992         };
1993
1994         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1995         encode_compound_hdr(&xdr, req, &hdr);
1996         encode_sequence(&xdr, &args->seq_args, &hdr);
1997         encode_putfh(&xdr, args->fh, &hdr);
1998         encode_open(&xdr, args, &hdr);
1999         encode_getfattr(&xdr, args->bitmask, &hdr);
2000         encode_nops(&hdr);
2001         return 0;
2002 }
2003
2004 /*
2005  * Encode an OPEN_DOWNGRADE request
2006  */
2007 static int nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req, __be32 *p, struct nfs_closeargs *args)
2008 {
2009         struct xdr_stream xdr;
2010         struct compound_hdr hdr = {
2011                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2012         };
2013
2014         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2015         encode_compound_hdr(&xdr, req, &hdr);
2016         encode_sequence(&xdr, &args->seq_args, &hdr);
2017         encode_putfh(&xdr, args->fh, &hdr);
2018         encode_open_downgrade(&xdr, args, &hdr);
2019         encode_getfattr(&xdr, args->bitmask, &hdr);
2020         encode_nops(&hdr);
2021         return 0;
2022 }
2023
2024 /*
2025  * Encode a LOCK request
2026  */
2027 static int nfs4_xdr_enc_lock(struct rpc_rqst *req, __be32 *p, struct nfs_lock_args *args)
2028 {
2029         struct xdr_stream xdr;
2030         struct compound_hdr hdr = {
2031                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2032         };
2033
2034         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2035         encode_compound_hdr(&xdr, req, &hdr);
2036         encode_sequence(&xdr, &args->seq_args, &hdr);
2037         encode_putfh(&xdr, args->fh, &hdr);
2038         encode_lock(&xdr, args, &hdr);
2039         encode_nops(&hdr);
2040         return 0;
2041 }
2042
2043 /*
2044  * Encode a LOCKT request
2045  */
2046 static int nfs4_xdr_enc_lockt(struct rpc_rqst *req, __be32 *p, struct nfs_lockt_args *args)
2047 {
2048         struct xdr_stream xdr;
2049         struct compound_hdr hdr = {
2050                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2051         };
2052
2053         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2054         encode_compound_hdr(&xdr, req, &hdr);
2055         encode_sequence(&xdr, &args->seq_args, &hdr);
2056         encode_putfh(&xdr, args->fh, &hdr);
2057         encode_lockt(&xdr, args, &hdr);
2058         encode_nops(&hdr);
2059         return 0;
2060 }
2061
2062 /*
2063  * Encode a LOCKU request
2064  */
2065 static int nfs4_xdr_enc_locku(struct rpc_rqst *req, __be32 *p, struct nfs_locku_args *args)
2066 {
2067         struct xdr_stream xdr;
2068         struct compound_hdr hdr = {
2069                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2070         };
2071
2072         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2073         encode_compound_hdr(&xdr, req, &hdr);
2074         encode_sequence(&xdr, &args->seq_args, &hdr);
2075         encode_putfh(&xdr, args->fh, &hdr);
2076         encode_locku(&xdr, args, &hdr);
2077         encode_nops(&hdr);
2078         return 0;
2079 }
2080
2081 static int nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req, __be32 *p, struct nfs_release_lockowner_args *args)
2082 {
2083         struct xdr_stream xdr;
2084         struct compound_hdr hdr = {
2085                 .minorversion = 0,
2086         };
2087
2088         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2089         encode_compound_hdr(&xdr, req, &hdr);
2090         encode_release_lockowner(&xdr, &args->lock_owner, &hdr);
2091         encode_nops(&hdr);
2092         return 0;
2093 }
2094
2095 /*
2096  * Encode a READLINK request
2097  */
2098 static int nfs4_xdr_enc_readlink(struct rpc_rqst *req, __be32 *p, const struct nfs4_readlink *args)
2099 {
2100         struct xdr_stream xdr;
2101         struct compound_hdr hdr = {
2102                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2103         };
2104
2105         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2106         encode_compound_hdr(&xdr, req, &hdr);
2107         encode_sequence(&xdr, &args->seq_args, &hdr);
2108         encode_putfh(&xdr, args->fh, &hdr);
2109         encode_readlink(&xdr, args, req, &hdr);
2110
2111         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2112                         args->pgbase, args->pglen);
2113         encode_nops(&hdr);
2114         return 0;
2115 }
2116
2117 /*
2118  * Encode a READDIR request
2119  */
2120 static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, __be32 *p, const struct nfs4_readdir_arg *args)
2121 {
2122         struct xdr_stream xdr;
2123         struct compound_hdr hdr = {
2124                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2125         };
2126
2127         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2128         encode_compound_hdr(&xdr, req, &hdr);
2129         encode_sequence(&xdr, &args->seq_args, &hdr);
2130         encode_putfh(&xdr, args->fh, &hdr);
2131         encode_readdir(&xdr, args, req, &hdr);
2132
2133         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2134                          args->pgbase, args->count);
2135         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2136                         __func__, hdr.replen << 2, args->pages,
2137                         args->pgbase, args->count);
2138         encode_nops(&hdr);
2139         return 0;
2140 }
2141
2142 /*
2143  * Encode a READ request
2144  */
2145 static int nfs4_xdr_enc_read(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
2146 {
2147         struct xdr_stream xdr;
2148         struct compound_hdr hdr = {
2149                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2150         };
2151
2152         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2153         encode_compound_hdr(&xdr, req, &hdr);
2154         encode_sequence(&xdr, &args->seq_args, &hdr);
2155         encode_putfh(&xdr, args->fh, &hdr);
2156         encode_read(&xdr, args, &hdr);
2157
2158         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2159                          args->pages, args->pgbase, args->count);
2160         req->rq_rcv_buf.flags |= XDRBUF_READ;
2161         encode_nops(&hdr);
2162         return 0;
2163 }
2164
2165 /*
2166  * Encode an SETATTR request
2167  */
2168 static int nfs4_xdr_enc_setattr(struct rpc_rqst *req, __be32 *p, struct nfs_setattrargs *args)
2169 {
2170         struct xdr_stream xdr;
2171         struct compound_hdr hdr = {
2172                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2173         };
2174
2175         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2176         encode_compound_hdr(&xdr, req, &hdr);
2177         encode_sequence(&xdr, &args->seq_args, &hdr);
2178         encode_putfh(&xdr, args->fh, &hdr);
2179         encode_setattr(&xdr, args, args->server, &hdr);
2180         encode_getfattr(&xdr, args->bitmask, &hdr);
2181         encode_nops(&hdr);
2182         return 0;
2183 }
2184
2185 /*
2186  * Encode a GETACL request
2187  */
2188 static int
2189 nfs4_xdr_enc_getacl(struct rpc_rqst *req, __be32 *p,
2190                 struct nfs_getaclargs *args)
2191 {
2192         struct xdr_stream xdr;
2193         struct compound_hdr hdr = {
2194                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2195         };
2196         uint32_t replen;
2197
2198         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2199         encode_compound_hdr(&xdr, req, &hdr);
2200         encode_sequence(&xdr, &args->seq_args, &hdr);
2201         encode_putfh(&xdr, args->fh, &hdr);
2202         replen = hdr.replen + op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz + 1;
2203         encode_getattr_two(&xdr, FATTR4_WORD0_ACL, 0, &hdr);
2204
2205         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2206                 args->acl_pages, args->acl_pgbase, args->acl_len);
2207         encode_nops(&hdr);
2208         return 0;
2209 }
2210
2211 /*
2212  * Encode a WRITE request
2213  */
2214 static int nfs4_xdr_enc_write(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
2215 {
2216         struct xdr_stream xdr;
2217         struct compound_hdr hdr = {
2218                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2219         };
2220
2221         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2222         encode_compound_hdr(&xdr, req, &hdr);
2223         encode_sequence(&xdr, &args->seq_args, &hdr);
2224         encode_putfh(&xdr, args->fh, &hdr);
2225         encode_write(&xdr, args, &hdr);
2226         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2227         encode_getfattr(&xdr, args->bitmask, &hdr);
2228         encode_nops(&hdr);
2229         return 0;
2230 }
2231
2232 /*
2233  *  a COMMIT request
2234  */
2235 static int nfs4_xdr_enc_commit(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
2236 {
2237         struct xdr_stream xdr;
2238         struct compound_hdr hdr = {
2239                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2240         };
2241
2242         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2243         encode_compound_hdr(&xdr, req, &hdr);
2244         encode_sequence(&xdr, &args->seq_args, &hdr);
2245         encode_putfh(&xdr, args->fh, &hdr);
2246         encode_commit(&xdr, args, &hdr);
2247         encode_getfattr(&xdr, args->bitmask, &hdr);
2248         encode_nops(&hdr);
2249         return 0;
2250 }
2251
2252 /*
2253  * FSINFO request
2254  */
2255 static int nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, __be32 *p, struct nfs4_fsinfo_arg *args)
2256 {
2257         struct xdr_stream xdr;
2258         struct compound_hdr hdr = {
2259                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2260         };
2261
2262         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2263         encode_compound_hdr(&xdr, req, &hdr);
2264         encode_sequence(&xdr, &args->seq_args, &hdr);
2265         encode_putfh(&xdr, args->fh, &hdr);
2266         encode_fsinfo(&xdr, args->bitmask, &hdr);
2267         encode_nops(&hdr);
2268         return 0;
2269 }
2270
2271 /*
2272  * a PATHCONF request
2273  */
2274 static int nfs4_xdr_enc_pathconf(struct rpc_rqst *req, __be32 *p, const struct nfs4_pathconf_arg *args)
2275 {
2276         struct xdr_stream xdr;
2277         struct compound_hdr hdr = {
2278                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2279         };
2280
2281         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2282         encode_compound_hdr(&xdr, req, &hdr);
2283         encode_sequence(&xdr, &args->seq_args, &hdr);
2284         encode_putfh(&xdr, args->fh, &hdr);
2285         encode_getattr_one(&xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2286                            &hdr);
2287         encode_nops(&hdr);
2288         return 0;
2289 }
2290
2291 /*
2292  * a STATFS request
2293  */
2294 static int nfs4_xdr_enc_statfs(struct rpc_rqst *req, __be32 *p, const struct nfs4_statfs_arg *args)
2295 {
2296         struct xdr_stream xdr;
2297         struct compound_hdr hdr = {
2298                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2299         };
2300
2301         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2302         encode_compound_hdr(&xdr, req, &hdr);
2303         encode_sequence(&xdr, &args->seq_args, &hdr);
2304         encode_putfh(&xdr, args->fh, &hdr);
2305         encode_getattr_two(&xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2306                            args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2307         encode_nops(&hdr);
2308         return 0;
2309 }
2310
2311 /*
2312  * GETATTR_BITMAP request
2313  */
2314 static int nfs4_xdr_enc_server_caps(struct rpc_rqst *req, __be32 *p,
2315                                     struct nfs4_server_caps_arg *args)
2316 {
2317         struct xdr_stream xdr;
2318         struct compound_hdr hdr = {
2319                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2320         };
2321
2322         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2323         encode_compound_hdr(&xdr, req, &hdr);
2324         encode_sequence(&xdr, &args->seq_args, &hdr);
2325         encode_putfh(&xdr, args->fhandle, &hdr);
2326         encode_getattr_one(&xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2327                            FATTR4_WORD0_LINK_SUPPORT|
2328                            FATTR4_WORD0_SYMLINK_SUPPORT|
2329                            FATTR4_WORD0_ACLSUPPORT, &hdr);
2330         encode_nops(&hdr);
2331         return 0;
2332 }
2333
2334 /*
2335  * a RENEW request
2336  */
2337 static int nfs4_xdr_enc_renew(struct rpc_rqst *req, __be32 *p, struct nfs_client *clp)
2338 {
2339         struct xdr_stream xdr;
2340         struct compound_hdr hdr = {
2341                 .nops   = 0,
2342         };
2343
2344         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2345         encode_compound_hdr(&xdr, req, &hdr);
2346         encode_renew(&xdr, clp, &hdr);
2347         encode_nops(&hdr);
2348         return 0;
2349 }
2350
2351 /*
2352  * a SETCLIENTID request
2353  */
2354 static int nfs4_xdr_enc_setclientid(struct rpc_rqst *req, __be32 *p, struct nfs4_setclientid *sc)
2355 {
2356         struct xdr_stream xdr;
2357         struct compound_hdr hdr = {
2358                 .nops   = 0,
2359         };
2360
2361         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2362         encode_compound_hdr(&xdr, req, &hdr);
2363         encode_setclientid(&xdr, sc, &hdr);
2364         encode_nops(&hdr);
2365         return 0;
2366 }
2367
2368 /*
2369  * a SETCLIENTID_CONFIRM request
2370  */
2371 static int nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req, __be32 *p, struct nfs4_setclientid_res *arg)
2372 {
2373         struct xdr_stream xdr;
2374         struct compound_hdr hdr = {
2375                 .nops   = 0,
2376         };
2377         const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
2378
2379         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2380         encode_compound_hdr(&xdr, req, &hdr);
2381         encode_setclientid_confirm(&xdr, arg, &hdr);
2382         encode_putrootfh(&xdr, &hdr);
2383         encode_fsinfo(&xdr, lease_bitmap, &hdr);
2384         encode_nops(&hdr);
2385         return 0;
2386 }
2387
2388 /*
2389  * DELEGRETURN request
2390  */
2391 static int nfs4_xdr_enc_delegreturn(struct rpc_rqst *req, __be32 *p, const struct nfs4_delegreturnargs *args)
2392 {
2393         struct xdr_stream xdr;
2394         struct compound_hdr hdr = {
2395                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2396         };
2397
2398         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2399         encode_compound_hdr(&xdr, req, &hdr);
2400         encode_sequence(&xdr, &args->seq_args, &hdr);
2401         encode_putfh(&xdr, args->fhandle, &hdr);
2402         encode_delegreturn(&xdr, args->stateid, &hdr);
2403         encode_getfattr(&xdr, args->bitmask, &hdr);
2404         encode_nops(&hdr);
2405         return 0;
2406 }
2407
2408 /*
2409  * Encode FS_LOCATIONS request
2410  */
2411 static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, __be32 *p, struct nfs4_fs_locations_arg *args)
2412 {
2413         struct xdr_stream xdr;
2414         struct compound_hdr hdr = {
2415                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2416         };
2417         uint32_t replen;
2418
2419         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2420         encode_compound_hdr(&xdr, req, &hdr);
2421         encode_sequence(&xdr, &args->seq_args, &hdr);
2422         encode_putfh(&xdr, args->dir_fh, &hdr);
2423         encode_lookup(&xdr, args->name, &hdr);
2424         replen = hdr.replen;    /* get the attribute into args->page */
2425         encode_fs_locations(&xdr, args->bitmask, &hdr);
2426
2427         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2428                         0, PAGE_SIZE);
2429         encode_nops(&hdr);
2430         return 0;
2431 }
2432
2433 #if defined(CONFIG_NFS_V4_1)
2434 /*
2435  * EXCHANGE_ID request
2436  */
2437 static int nfs4_xdr_enc_exchange_id(struct rpc_rqst *req, uint32_t *p,
2438                                     struct nfs41_exchange_id_args *args)
2439 {
2440         struct xdr_stream xdr;
2441         struct compound_hdr hdr = {
2442                 .minorversion = args->client->cl_mvops->minor_version,
2443         };
2444
2445         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2446         encode_compound_hdr(&xdr, req, &hdr);
2447         encode_exchange_id(&xdr, args, &hdr);
2448         encode_nops(&hdr);
2449         return 0;
2450 }
2451
2452 /*
2453  * a CREATE_SESSION request
2454  */
2455 static int nfs4_xdr_enc_create_session(struct rpc_rqst *req, uint32_t *p,
2456                                        struct nfs41_create_session_args *args)
2457 {
2458         struct xdr_stream xdr;
2459         struct compound_hdr hdr = {
2460                 .minorversion = args->client->cl_mvops->minor_version,
2461         };
2462
2463         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2464         encode_compound_hdr(&xdr, req, &hdr);
2465         encode_create_session(&xdr, args, &hdr);
2466         encode_nops(&hdr);
2467         return 0;
2468 }
2469
2470 /*
2471  * a DESTROY_SESSION request
2472  */
2473 static int nfs4_xdr_enc_destroy_session(struct rpc_rqst *req, uint32_t *p,
2474                                         struct nfs4_session *session)
2475 {
2476         struct xdr_stream xdr;
2477         struct compound_hdr hdr = {
2478                 .minorversion = session->clp->cl_mvops->minor_version,
2479         };
2480
2481         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2482         encode_compound_hdr(&xdr, req, &hdr);
2483         encode_destroy_session(&xdr, session, &hdr);
2484         encode_nops(&hdr);
2485         return 0;
2486 }
2487
2488 /*
2489  * a SEQUENCE request
2490  */
2491 static int nfs4_xdr_enc_sequence(struct rpc_rqst *req, uint32_t *p,
2492                                  struct nfs4_sequence_args *args)
2493 {
2494         struct xdr_stream xdr;
2495         struct compound_hdr hdr = {
2496                 .minorversion = nfs4_xdr_minorversion(args),
2497         };
2498
2499         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2500         encode_compound_hdr(&xdr, req, &hdr);
2501         encode_sequence(&xdr, args, &hdr);
2502         encode_nops(&hdr);
2503         return 0;
2504 }
2505
2506 /*
2507  * a GET_LEASE_TIME request
2508  */
2509 static int nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req, uint32_t *p,
2510                                        struct nfs4_get_lease_time_args *args)
2511 {
2512         struct xdr_stream xdr;
2513         struct compound_hdr hdr = {
2514                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2515         };
2516         const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
2517
2518         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2519         encode_compound_hdr(&xdr, req, &hdr);
2520         encode_sequence(&xdr, &args->la_seq_args, &hdr);
2521         encode_putrootfh(&xdr, &hdr);
2522         encode_fsinfo(&xdr, lease_bitmap, &hdr);
2523         encode_nops(&hdr);
2524         return 0;
2525 }
2526
2527 /*
2528  * a RECLAIM_COMPLETE request
2529  */
2530 static int nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req, uint32_t *p,
2531                                      struct nfs41_reclaim_complete_args *args)
2532 {
2533         struct xdr_stream xdr;
2534         struct compound_hdr hdr = {
2535                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2536         };
2537
2538         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2539         encode_compound_hdr(&xdr, req, &hdr);
2540         encode_sequence(&xdr, &args->seq_args, &hdr);
2541         encode_reclaim_complete(&xdr, args, &hdr);
2542         encode_nops(&hdr);
2543         return 0;
2544 }
2545
2546 #endif /* CONFIG_NFS_V4_1 */
2547
2548 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
2549 {
2550         dprintk("nfs: %s: prematurely hit end of receive buffer. "
2551                 "Remaining buffer length is %tu words.\n",
2552                 func, xdr->end - xdr->p);
2553 }
2554
2555 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
2556 {
2557         __be32 *p;
2558
2559         p = xdr_inline_decode(xdr, 4);
2560         if (unlikely(!p))
2561                 goto out_overflow;
2562         *len = be32_to_cpup(p);
2563         p = xdr_inline_decode(xdr, *len);
2564         if (unlikely(!p))
2565                 goto out_overflow;
2566         *string = (char *)p;
2567         return 0;
2568 out_overflow:
2569         print_overflow_msg(__func__, xdr);
2570         return -EIO;
2571 }
2572
2573 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
2574 {
2575         __be32 *p;
2576
2577         p = xdr_inline_decode(xdr, 8);
2578         if (unlikely(!p))
2579                 goto out_overflow;
2580         hdr->status = be32_to_cpup(p++);
2581         hdr->taglen = be32_to_cpup(p);
2582
2583         p = xdr_inline_decode(xdr, hdr->taglen + 4);
2584         if (unlikely(!p))
2585                 goto out_overflow;
2586         hdr->tag = (char *)p;
2587         p += XDR_QUADLEN(hdr->taglen);
2588         hdr->nops = be32_to_cpup(p);
2589         if (unlikely(hdr->nops < 1))
2590                 return nfs4_stat_to_errno(hdr->status);
2591         return 0;
2592 out_overflow:
2593         print_overflow_msg(__func__, xdr);
2594         return -EIO;
2595 }
2596
2597 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
2598 {
2599         __be32 *p;
2600         uint32_t opnum;
2601         int32_t nfserr;
2602
2603         p = xdr_inline_decode(xdr, 8);
2604         if (unlikely(!p))
2605                 goto out_overflow;
2606         opnum = be32_to_cpup(p++);
2607         if (opnum != expected) {
2608                 dprintk("nfs: Server returned operation"
2609                         " %d but we issued a request for %d\n",
2610                                 opnum, expected);
2611                 return -EIO;
2612         }
2613         nfserr = be32_to_cpup(p);
2614         if (nfserr != NFS_OK)
2615                 return nfs4_stat_to_errno(nfserr);
2616         return 0;
2617 out_overflow:
2618         print_overflow_msg(__func__, xdr);
2619         return -EIO;
2620 }
2621
2622 /* Dummy routine */
2623 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
2624 {
2625         __be32 *p;
2626         unsigned int strlen;
2627         char *str;
2628
2629         p = xdr_inline_decode(xdr, 12);
2630         if (likely(p))
2631                 return decode_opaque_inline(xdr, &strlen, &str);
2632         print_overflow_msg(__func__, xdr);
2633         return -EIO;
2634 }
2635
2636 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
2637 {
2638         uint32_t bmlen;
2639         __be32 *p;
2640
2641         p = xdr_inline_decode(xdr, 4);
2642         if (unlikely(!p))
2643                 goto out_overflow;
2644         bmlen = be32_to_cpup(p);
2645
2646         bitmap[0] = bitmap[1] = 0;
2647         p = xdr_inline_decode(xdr, (bmlen << 2));
2648         if (unlikely(!p))
2649                 goto out_overflow;
2650         if (bmlen > 0) {
2651                 bitmap[0] = be32_to_cpup(p++);
2652                 if (bmlen > 1)
2653                         bitmap[1] = be32_to_cpup(p);
2654         }
2655         return 0;
2656 out_overflow:
2657         print_overflow_msg(__func__, xdr);
2658         return -EIO;
2659 }
2660
2661 static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, __be32 **savep)
2662 {
2663         __be32 *p;
2664
2665         p = xdr_inline_decode(xdr, 4);
2666         if (unlikely(!p))
2667                 goto out_overflow;
2668         *attrlen = be32_to_cpup(p);
2669         *savep = xdr->p;
2670         return 0;
2671 out_overflow:
2672         print_overflow_msg(__func__, xdr);
2673         return -EIO;
2674 }
2675
2676 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
2677 {
2678         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
2679                 decode_attr_bitmap(xdr, bitmask);
2680                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
2681         } else
2682                 bitmask[0] = bitmask[1] = 0;
2683         dprintk("%s: bitmask=%08x:%08x\n", __func__, bitmask[0], bitmask[1]);
2684         return 0;
2685 }
2686
2687 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
2688 {
2689         __be32 *p;
2690         int ret = 0;
2691
2692         *type = 0;
2693         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
2694                 return -EIO;
2695         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
2696                 p = xdr_inline_decode(xdr, 4);
2697                 if (unlikely(!p))
2698                         goto out_overflow;
2699                 *type = be32_to_cpup(p);
2700                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
2701                         dprintk("%s: bad type %d\n", __func__, *type);
2702                         return -EIO;
2703                 }
2704                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
2705                 ret = NFS_ATTR_FATTR_TYPE;
2706         }
2707         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
2708         return ret;
2709 out_overflow:
2710         print_overflow_msg(__func__, xdr);
2711         return -EIO;
2712 }
2713
2714 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
2715 {
2716         __be32 *p;
2717         int ret = 0;
2718
2719         *change = 0;
2720         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
2721                 return -EIO;
2722         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
2723                 p = xdr_inline_decode(xdr, 8);
2724                 if (unlikely(!p))
2725                         goto out_overflow;
2726                 xdr_decode_hyper(p, change);
2727                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
2728                 ret = NFS_ATTR_FATTR_CHANGE;
2729         }
2730         dprintk("%s: change attribute=%Lu\n", __func__,
2731                         (unsigned long long)*change);
2732         return ret;
2733 out_overflow:
2734         print_overflow_msg(__func__, xdr);
2735         return -EIO;
2736 }
2737
2738 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
2739 {
2740         __be32 *p;
2741         int ret = 0;
2742
2743         *size = 0;
2744         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
2745                 return -EIO;
2746         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
2747                 p = xdr_inline_decode(xdr, 8);
2748                 if (unlikely(!p))
2749                         goto out_overflow;
2750                 xdr_decode_hyper(p, size);
2751                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
2752                 ret = NFS_ATTR_FATTR_SIZE;
2753         }
2754         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
2755         return ret;
2756 out_overflow:
2757         print_overflow_msg(__func__, xdr);
2758         return -EIO;
2759 }
2760
2761 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2762 {
2763         __be32 *p;
2764
2765         *res = 0;
2766         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
2767                 return -EIO;
2768         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
2769                 p = xdr_inline_decode(xdr, 4);
2770                 if (unlikely(!p))
2771                         goto out_overflow;
2772                 *res = be32_to_cpup(p);
2773                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
2774         }
2775         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
2776         return 0;
2777 out_overflow:
2778         print_overflow_msg(__func__, xdr);
2779         return -EIO;
2780 }
2781
2782 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2783 {
2784         __be32 *p;
2785
2786         *res = 0;
2787         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
2788                 return -EIO;
2789         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
2790                 p = xdr_inline_decode(xdr, 4);
2791                 if (unlikely(!p))
2792                         goto out_overflow;
2793                 *res = be32_to_cpup(p);
2794                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
2795         }
2796         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
2797         return 0;
2798 out_overflow:
2799         print_overflow_msg(__func__, xdr);
2800         return -EIO;
2801 }
2802
2803 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
2804 {
2805         __be32 *p;
2806         int ret = 0;
2807
2808         fsid->major = 0;
2809         fsid->minor = 0;
2810         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
2811                 return -EIO;
2812         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
2813                 p = xdr_inline_decode(xdr, 16);
2814                 if (unlikely(!p))
2815                         goto out_overflow;
2816                 p = xdr_decode_hyper(p, &fsid->major);
2817                 xdr_decode_hyper(p, &fsid->minor);
2818                 bitmap[0] &= ~FATTR4_WORD0_FSID;
2819                 ret = NFS_ATTR_FATTR_FSID;
2820         }
2821         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
2822                         (unsigned long long)fsid->major,
2823                         (unsigned long long)fsid->minor);
2824         return ret;
2825 out_overflow:
2826         print_overflow_msg(__func__, xdr);
2827         return -EIO;
2828 }
2829
2830 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2831 {
2832         __be32 *p;
2833
2834         *res = 60;
2835         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
2836                 return -EIO;
2837         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
2838                 p = xdr_inline_decode(xdr, 4);
2839                 if (unlikely(!p))
2840                         goto out_overflow;
2841                 *res = be32_to_cpup(p);
2842                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
2843         }
2844         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
2845         return 0;
2846 out_overflow:
2847         print_overflow_msg(__func__, xdr);
2848         return -EIO;
2849 }
2850
2851 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2852 {
2853         __be32 *p;
2854
2855         *res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
2856         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
2857                 return -EIO;
2858         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
2859                 p = xdr_inline_decode(xdr, 4);
2860                 if (unlikely(!p))
2861                         goto out_overflow;
2862                 *res = be32_to_cpup(p);
2863                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
2864         }
2865         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
2866         return 0;
2867 out_overflow:
2868         print_overflow_msg(__func__, xdr);
2869         return -EIO;
2870 }
2871
2872 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
2873 {
2874         __be32 *p;
2875         int ret = 0;
2876
2877         *fileid = 0;
2878         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
2879                 return -EIO;
2880         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
2881                 p = xdr_inline_decode(xdr, 8);
2882                 if (unlikely(!p))
2883                         goto out_overflow;
2884                 xdr_decode_hyper(p, fileid);
2885                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
2886                 ret = NFS_ATTR_FATTR_FILEID;
2887         }
2888         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
2889         return ret;
2890 out_overflow:
2891         print_overflow_msg(__func__, xdr);
2892         return -EIO;
2893 }
2894
2895 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
2896 {
2897         __be32 *p;
2898         int ret = 0;
2899
2900         *fileid = 0;
2901         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
2902                 return -EIO;
2903         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
2904                 p = xdr_inline_decode(xdr, 8);
2905                 if (unlikely(!p))
2906                         goto out_overflow;
2907                 xdr_decode_hyper(p, fileid);
2908                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
2909                 ret = NFS_ATTR_FATTR_FILEID;
2910         }
2911         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
2912         return ret;
2913 out_overflow:
2914         print_overflow_msg(__func__, xdr);
2915         return -EIO;
2916 }
2917
2918 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2919 {
2920         __be32 *p;
2921         int status = 0;
2922
2923         *res = 0;
2924         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
2925                 return -EIO;
2926         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
2927                 p = xdr_inline_decode(xdr, 8);
2928                 if (unlikely(!p))
2929                         goto out_overflow;
2930                 xdr_decode_hyper(p, res);
2931                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
2932         }
2933         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
2934         return status;
2935 out_overflow:
2936         print_overflow_msg(__func__, xdr);
2937         return -EIO;
2938 }
2939
2940 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2941 {
2942         __be32 *p;
2943         int status = 0;
2944
2945         *res = 0;
2946         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
2947                 return -EIO;
2948         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
2949                 p = xdr_inline_decode(xdr, 8);
2950                 if (unlikely(!p))
2951                         goto out_overflow;
2952                 xdr_decode_hyper(p, res);
2953                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
2954         }
2955         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
2956         return status;
2957 out_overflow:
2958         print_overflow_msg(__func__, xdr);
2959         return -EIO;
2960 }
2961
2962 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2963 {
2964         __be32 *p;
2965         int status = 0;
2966
2967         *res = 0;
2968         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
2969                 return -EIO;
2970         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
2971                 p = xdr_inline_decode(xdr, 8);
2972                 if (unlikely(!p))
2973                         goto out_overflow;
2974                 xdr_decode_hyper(p, res);
2975                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
2976         }
2977         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
2978         return status;
2979 out_overflow:
2980         print_overflow_msg(__func__, xdr);
2981         return -EIO;
2982 }
2983
2984 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
2985 {
2986         u32 n;
2987         __be32 *p;
2988         int status = 0;
2989
2990         p = xdr_inline_decode(xdr, 4);
2991         if (unlikely(!p))
2992                 goto out_overflow;
2993         n = be32_to_cpup(p);
2994         if (n == 0)
2995                 goto root_path;
2996         dprintk("path ");
2997         path->ncomponents = 0;
2998         while (path->ncomponents < n) {
2999                 struct nfs4_string *component = &path->components[path->ncomponents];
3000                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3001                 if (unlikely(status != 0))
3002                         goto out_eio;
3003                 if (path->ncomponents != n)
3004                         dprintk("/");
3005                 dprintk("%s", component->data);
3006                 if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
3007                         path->ncomponents++;
3008                 else {
3009                         dprintk("cannot parse %d components in path\n", n);
3010                         goto out_eio;
3011                 }
3012         }
3013 out:
3014         dprintk("\n");
3015         return status;
3016 root_path:
3017 /* a root pathname is sent as a zero component4 */
3018         path->ncomponents = 1;
3019         path->components[0].len=0;
3020         path->components[0].data=NULL;
3021         dprintk("path /\n");
3022         goto out;
3023 out_eio:
3024         dprintk(" status %d", status);
3025         status = -EIO;
3026         goto out;
3027 out_overflow:
3028         print_overflow_msg(__func__, xdr);
3029         return -EIO;
3030 }
3031
3032 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3033 {
3034         int n;
3035         __be32 *p;
3036         int status = -EIO;
3037
3038         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3039                 goto out;
3040         status = 0;
3041         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3042                 goto out;
3043         dprintk("%s: fsroot ", __func__);
3044         status = decode_pathname(xdr, &res->fs_path);
3045         if (unlikely(status != 0))
3046                 goto out;
3047         p = xdr_inline_decode(xdr, 4);
3048         if (unlikely(!p))
3049                 goto out_overflow;
3050         n = be32_to_cpup(p);
3051         if (n <= 0)
3052                 goto out_eio;
3053         res->nlocations = 0;
3054         while (res->nlocations < n) {
3055                 u32 m;
3056                 struct nfs4_fs_location *loc = &res->locations[res->nlocations];
3057
3058                 p = xdr_inline_decode(xdr, 4);
3059                 if (unlikely(!p))
3060                         goto out_overflow;
3061                 m = be32_to_cpup(p);
3062
3063                 loc->nservers = 0;
3064                 dprintk("%s: servers ", __func__);
3065                 while (loc->nservers < m) {
3066                         struct nfs4_string *server = &loc->servers[loc->nservers];
3067                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3068                         if (unlikely(status != 0))
3069                                 goto out_eio;
3070                         dprintk("%s ", server->data);
3071                         if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
3072                                 loc->nservers++;
3073                         else {
3074                                 unsigned int i;
3075                                 dprintk("%s: using first %u of %u servers "
3076                                         "returned for location %u\n",
3077                                                 __func__,
3078                                                 NFS4_FS_LOCATION_MAXSERVERS,
3079                                                 m, res->nlocations);
3080                                 for (i = loc->nservers; i < m; i++) {
3081                                         unsigned int len;
3082                                         char *data;
3083                                         status = decode_opaque_inline(xdr, &len, &data);
3084                                         if (unlikely(status != 0))
3085                                                 goto out_eio;
3086                                 }
3087                         }
3088                 }
3089                 status = decode_pathname(xdr, &loc->rootpath);
3090                 if (unlikely(status != 0))
3091                         goto out_eio;
3092                 if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
3093                         res->nlocations++;
3094         }
3095         if (res->nlocations != 0)
3096                 status = NFS_ATTR_FATTR_V4_REFERRAL;
3097 out:
3098         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3099         return status;
3100 out_overflow:
3101         print_overflow_msg(__func__, xdr);
3102 out_eio:
3103         status = -EIO;
3104         goto out;
3105 }
3106
3107 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3108 {
3109         __be32 *p;
3110         int status = 0;
3111
3112         *res = 0;
3113         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3114                 return -EIO;
3115         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3116                 p = xdr_inline_decode(xdr, 8);
3117                 if (unlikely(!p))
3118                         goto out_overflow;
3119                 xdr_decode_hyper(p, res);
3120                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3121         }
3122         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3123         return status;
3124 out_overflow:
3125         print_overflow_msg(__func__, xdr);
3126         return -EIO;
3127 }
3128
3129 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3130 {
3131         __be32 *p;
3132         int status = 0;
3133
3134         *maxlink = 1;
3135         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3136                 return -EIO;
3137         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3138                 p = xdr_inline_decode(xdr, 4);
3139                 if (unlikely(!p))
3140                         goto out_overflow;
3141                 *maxlink = be32_to_cpup(p);
3142                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3143         }
3144         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3145         return status;
3146 out_overflow:
3147         print_overflow_msg(__func__, xdr);
3148         return -EIO;
3149 }
3150
3151 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3152 {
3153         __be32 *p;
3154         int status = 0;
3155
3156         *maxname = 1024;
3157         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3158                 return -EIO;
3159         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3160                 p = xdr_inline_decode(xdr, 4);
3161                 if (unlikely(!p))
3162                         goto out_overflow;
3163                 *maxname = be32_to_cpup(p);
3164                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3165         }
3166         dprintk("%s: maxname=%u\n", __func__, *maxname);
3167         return status;
3168 out_overflow:
3169         print_overflow_msg(__func__, xdr);
3170         return -EIO;
3171 }
3172
3173 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3174 {
3175         __be32 *p;
3176         int status = 0;
3177
3178         *res = 1024;
3179         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3180                 return -EIO;
3181         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3182                 uint64_t maxread;
3183                 p = xdr_inline_decode(xdr, 8);
3184                 if (unlikely(!p))
3185                         goto out_overflow;
3186                 xdr_decode_hyper(p, &maxread);
3187                 if (maxread > 0x7FFFFFFF)
3188                         maxread = 0x7FFFFFFF;
3189                 *res = (uint32_t)maxread;
3190                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3191         }
3192         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3193         return status;
3194 out_overflow:
3195         print_overflow_msg(__func__, xdr);
3196         return -EIO;
3197 }
3198
3199 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3200 {
3201         __be32 *p;
3202         int status = 0;
3203
3204         *res = 1024;
3205         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3206                 return -EIO;
3207         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3208                 uint64_t maxwrite;
3209                 p = xdr_inline_decode(xdr, 8);
3210                 if (unlikely(!p))
3211                         goto out_overflow;
3212                 xdr_decode_hyper(p, &maxwrite);
3213                 if (maxwrite > 0x7FFFFFFF)
3214                         maxwrite = 0x7FFFFFFF;
3215                 *res = (uint32_t)maxwrite;
3216                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3217         }
3218         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3219         return status;
3220 out_overflow:
3221         print_overflow_msg(__func__, xdr);
3222         return -EIO;
3223 }
3224
3225 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3226 {
3227         uint32_t tmp;
3228         __be32 *p;
3229         int ret = 0;
3230
3231         *mode = 0;
3232         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3233                 return -EIO;
3234         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3235                 p = xdr_inline_decode(xdr, 4);
3236                 if (unlikely(!p))
3237                         goto out_overflow;
3238                 tmp = be32_to_cpup(p);
3239                 *mode = tmp & ~S_IFMT;
3240                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3241                 ret = NFS_ATTR_FATTR_MODE;
3242         }
3243         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3244         return ret;
3245 out_overflow:
3246         print_overflow_msg(__func__, xdr);
3247         return -EIO;
3248 }
3249
3250 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3251 {
3252         __be32 *p;
3253         int ret = 0;
3254
3255         *nlink = 1;
3256         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3257                 return -EIO;
3258         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3259                 p = xdr_inline_decode(xdr, 4);
3260                 if (unlikely(!p))
3261                         goto out_overflow;
3262                 *nlink = be32_to_cpup(p);
3263                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3264                 ret = NFS_ATTR_FATTR_NLINK;
3265         }
3266         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3267         return ret;
3268 out_overflow:
3269         print_overflow_msg(__func__, xdr);
3270         return -EIO;
3271 }
3272
3273 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3274                 struct nfs_client *clp, uint32_t *uid, int may_sleep)
3275 {
3276         uint32_t len;
3277         __be32 *p;
3278         int ret = 0;
3279
3280         *uid = -2;
3281         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3282                 return -EIO;
3283         if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3284                 p = xdr_inline_decode(xdr, 4);
3285                 if (unlikely(!p))
3286                         goto out_overflow;
3287                 len = be32_to_cpup(p);
3288                 p = xdr_inline_decode(xdr, len);
3289                 if (unlikely(!p))
3290                         goto out_overflow;
3291                 if (!may_sleep) {
3292                         /* do nothing */
3293                 } else if (len < XDR_MAX_NETOBJ) {
3294                         if (nfs_map_name_to_uid(clp, (char *)p, len, uid) == 0)
3295                                 ret = NFS_ATTR_FATTR_OWNER;
3296                         else
3297                                 dprintk("%s: nfs_map_name_to_uid failed!\n",
3298                                                 __func__);
3299                 } else
3300                         dprintk("%s: name too long (%u)!\n",
3301                                         __func__, len);
3302                 bitmap[1] &= ~FATTR4_WORD1_OWNER;
3303         }
3304         dprintk("%s: uid=%d\n", __func__, (int)*uid);
3305         return ret;
3306 out_overflow:
3307         print_overflow_msg(__func__, xdr);
3308         return -EIO;
3309 }
3310
3311 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3312                 struct nfs_client *clp, uint32_t *gid, int may_sleep)
3313 {
3314         uint32_t len;
3315         __be32 *p;
3316         int ret = 0;
3317
3318         *gid = -2;
3319         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3320                 return -EIO;
3321         if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3322                 p = xdr_inline_decode(xdr, 4);
3323                 if (unlikely(!p))
3324                         goto out_overflow;
3325                 len = be32_to_cpup(p);
3326                 p = xdr_inline_decode(xdr, len);
3327                 if (unlikely(!p))
3328                         goto out_overflow;
3329                 if (!may_sleep) {
3330                         /* do nothing */
3331                 } else if (len < XDR_MAX_NETOBJ) {
3332                         if (nfs_map_group_to_gid(clp, (char *)p, len, gid) == 0)
3333                                 ret = NFS_ATTR_FATTR_GROUP;
3334                         else
3335                                 dprintk("%s: nfs_map_group_to_gid failed!\n",
3336                                                 __func__);
3337                 } else
3338                         dprintk("%s: name too long (%u)!\n",
3339                                         __func__, len);
3340                 bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3341         }
3342         dprintk("%s: gid=%d\n", __func__, (int)*gid);
3343         return ret;
3344 out_overflow:
3345         print_overflow_msg(__func__, xdr);
3346         return -EIO;
3347 }
3348
3349 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3350 {
3351         uint32_t major = 0, minor = 0;
3352         __be32 *p;
3353         int ret = 0;
3354
3355         *rdev = MKDEV(0,0);
3356         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3357                 return -EIO;
3358         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3359                 dev_t tmp;
3360
3361                 p = xdr_inline_decode(xdr, 8);
3362                 if (unlikely(!p))
3363                         goto out_overflow;
3364                 major = be32_to_cpup(p++);
3365                 minor = be32_to_cpup(p);
3366                 tmp = MKDEV(major, minor);
3367                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3368                         *rdev = tmp;
3369                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3370                 ret = NFS_ATTR_FATTR_RDEV;
3371         }
3372         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3373         return ret;
3374 out_overflow:
3375         print_overflow_msg(__func__, xdr);
3376         return -EIO;
3377 }
3378
3379 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3380 {
3381         __be32 *p;
3382         int status = 0;
3383
3384         *res = 0;
3385         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3386                 return -EIO;
3387         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3388                 p = xdr_inline_decode(xdr, 8);
3389                 if (unlikely(!p))
3390                         goto out_overflow;
3391                 xdr_decode_hyper(p, res);
3392                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3393         }
3394         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3395         return status;
3396 out_overflow:
3397         print_overflow_msg(__func__, xdr);
3398         return -EIO;
3399 }
3400
3401 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3402 {
3403         __be32 *p;
3404         int status = 0;
3405
3406         *res = 0;
3407         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3408                 return -EIO;
3409         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3410                 p = xdr_inline_decode(xdr, 8);
3411                 if (unlikely(!p))
3412                         goto out_overflow;
3413                 xdr_decode_hyper(p, res);
3414                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3415         }
3416         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3417         return status;
3418 out_overflow:
3419         print_overflow_msg(__func__, xdr);
3420         return -EIO;
3421 }
3422
3423 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3424 {
3425         __be32 *p;
3426         int status = 0;
3427
3428         *res = 0;
3429         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
3430                 return -EIO;
3431         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3432                 p = xdr_inline_decode(xdr, 8);
3433                 if (unlikely(!p))
3434                         goto out_overflow;
3435                 xdr_decode_hyper(p, res);
3436                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
3437         }
3438         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
3439         return status;
3440 out_overflow:
3441         print_overflow_msg(__func__, xdr);
3442         return -EIO;
3443 }
3444
3445 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
3446 {
3447         __be32 *p;
3448         int ret = 0;
3449
3450         *used = 0;
3451         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
3452                 return -EIO;
3453         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
3454                 p = xdr_inline_decode(xdr, 8);
3455                 if (unlikely(!p))
3456                         goto out_overflow;
3457                 xdr_decode_hyper(p, used);
3458                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
3459                 ret = NFS_ATTR_FATTR_SPACE_USED;
3460         }
3461         dprintk("%s: space used=%Lu\n", __func__,
3462                         (unsigned long long)*used);
3463         return ret;
3464 out_overflow:
3465         print_overflow_msg(__func__, xdr);
3466         return -EIO;
3467 }
3468
3469 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
3470 {
3471         __be32 *p;
3472         uint64_t sec;
3473         uint32_t nsec;
3474
3475         p = xdr_inline_decode(xdr, 12);
3476         if (unlikely(!p))
3477                 goto out_overflow;
3478         p = xdr_decode_hyper(p, &sec);
3479         nsec = be32_to_cpup(p);
3480         time->tv_sec = (time_t)sec;
3481         time->tv_nsec = (long)nsec;
3482         return 0;
3483 out_overflow:
3484         print_overflow_msg(__func__, xdr);
3485         return -EIO;
3486 }
3487
3488 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3489 {
3490         int status = 0;
3491
3492         time->tv_sec = 0;
3493         time->tv_nsec = 0;
3494         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
3495                 return -EIO;
3496         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
3497                 status = decode_attr_time(xdr, time);
3498                 if (status == 0)
3499                         status = NFS_ATTR_FATTR_ATIME;
3500                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
3501         }
3502         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
3503         return status;
3504 }
3505
3506 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3507 {
3508         int status = 0;
3509
3510         time->tv_sec = 0;
3511         time->tv_nsec = 0;
3512         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
3513                 return -EIO;
3514         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
3515                 status = decode_attr_time(xdr, time);
3516                 if (status == 0)
3517                         status = NFS_ATTR_FATTR_CTIME;
3518                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
3519         }
3520         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
3521         return status;
3522 }
3523
3524 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3525 {
3526         int status = 0;
3527
3528         time->tv_sec = 0;
3529         time->tv_nsec = 0;
3530         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
3531                 return -EIO;
3532         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
3533                 status = decode_attr_time(xdr, time);
3534                 if (status == 0)
3535                         status = NFS_ATTR_FATTR_MTIME;
3536                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
3537         }
3538         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
3539         return status;
3540 }
3541
3542 static int verify_attr_len(struct xdr_stream *xdr, __be32 *savep, uint32_t attrlen)
3543 {
3544         unsigned int attrwords = XDR_QUADLEN(attrlen);
3545         unsigned int nwords = xdr->p - savep;
3546
3547         if (unlikely(attrwords != nwords)) {
3548                 dprintk("%s: server returned incorrect attribute length: "
3549                         "%u %c %u\n",
3550                                 __func__,
3551                                 attrwords << 2,
3552                                 (attrwords < nwords) ? '<' : '>',
3553                                 nwords << 2);
3554                 return -EIO;
3555         }
3556         return 0;
3557 }
3558
3559 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3560 {
3561         __be32 *p;
3562
3563         p = xdr_inline_decode(xdr, 20);
3564         if (unlikely(!p))
3565                 goto out_overflow;
3566         cinfo->atomic = be32_to_cpup(p++);
3567         p = xdr_decode_hyper(p, &cinfo->before);
3568         xdr_decode_hyper(p, &cinfo->after);
3569         return 0;
3570 out_overflow:
3571         print_overflow_msg(__func__, xdr);
3572         return -EIO;
3573 }
3574
3575 static int decode_access(struct xdr_stream *xdr, struct nfs4_accessres *access)
3576 {
3577         __be32 *p;
3578         uint32_t supp, acc;
3579         int status;
3580
3581         status = decode_op_hdr(xdr, OP_ACCESS);
3582         if (status)
3583                 return status;
3584         p = xdr_inline_decode(xdr, 8);
3585         if (unlikely(!p))
3586                 goto out_overflow;
3587         supp = be32_to_cpup(p++);
3588         acc = be32_to_cpup(p);
3589         access->supported = supp;
3590         access->access = acc;
3591         return 0;
3592 out_overflow:
3593         print_overflow_msg(__func__, xdr);
3594         return -EIO;
3595 }
3596
3597 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
3598 {
3599         __be32 *p;
3600
3601         p = xdr_inline_decode(xdr, len);
3602         if (likely(p)) {
3603                 memcpy(buf, p, len);
3604                 return 0;
3605         }
3606         print_overflow_msg(__func__, xdr);
3607         return -EIO;
3608 }
3609
3610 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
3611 {
3612         return decode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
3613 }
3614
3615 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
3616 {
3617         int status;
3618
3619         status = decode_op_hdr(xdr, OP_CLOSE);
3620         if (status != -EIO)
3621                 nfs_increment_open_seqid(status, res->seqid);
3622         if (!status)
3623                 status = decode_stateid(xdr, &res->stateid);
3624         return status;
3625 }
3626
3627 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
3628 {
3629         return decode_opaque_fixed(xdr, verifier, 8);
3630 }
3631
3632 static int decode_commit(struct xdr_stream *xdr, struct nfs_writeres *res)
3633 {
3634         int status;
3635
3636         status = decode_op_hdr(xdr, OP_COMMIT);
3637         if (!status)
3638                 status = decode_verifier(xdr, res->verf->verifier);
3639         return status;
3640 }
3641
3642 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3643 {
3644         __be32 *p;
3645         uint32_t bmlen;
3646         int status;
3647
3648         status = decode_op_hdr(xdr, OP_CREATE);
3649         if (status)
3650                 return status;
3651         if ((status = decode_change_info(xdr, cinfo)))
3652                 return status;
3653         p = xdr_inline_decode(xdr, 4);
3654         if (unlikely(!p))
3655                 goto out_overflow;
3656         bmlen = be32_to_cpup(p);
3657         p = xdr_inline_decode(xdr, bmlen << 2);
3658         if (likely(p))
3659                 return 0;
3660 out_overflow:
3661         print_overflow_msg(__func__, xdr);
3662         return -EIO;
3663 }
3664
3665 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
3666 {
3667         __be32 *savep;
3668         uint32_t attrlen, bitmap[2] = {0};
3669         int status;
3670
3671         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3672                 goto xdr_error;
3673         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3674                 goto xdr_error;
3675         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3676                 goto xdr_error;
3677         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
3678                 goto xdr_error;
3679         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
3680                 goto xdr_error;
3681         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
3682                 goto xdr_error;
3683         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
3684                 goto xdr_error;
3685         status = verify_attr_len(xdr, savep, attrlen);
3686 xdr_error:
3687         dprintk("%s: xdr returned %d!\n", __func__, -status);
3688         return status;
3689 }
3690
3691 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
3692 {
3693         __be32 *savep;
3694         uint32_t attrlen, bitmap[2] = {0};
3695         int status;
3696
3697         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3698                 goto xdr_error;
3699         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3700                 goto xdr_error;
3701         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3702                 goto xdr_error;
3703
3704         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
3705                 goto xdr_error;
3706         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
3707                 goto xdr_error;
3708         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
3709                 goto xdr_error;
3710         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
3711                 goto xdr_error;
3712         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
3713                 goto xdr_error;
3714         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
3715                 goto xdr_error;
3716
3717         status = verify_attr_len(xdr, savep, attrlen);
3718 xdr_error:
3719         dprintk("%s: xdr returned %d!\n", __func__, -status);
3720         return status;
3721 }
3722
3723 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
3724 {
3725         __be32 *savep;
3726         uint32_t attrlen, bitmap[2] = {0};
3727         int status;
3728
3729         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3730                 goto xdr_error;
3731         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3732                 goto xdr_error;
3733         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3734                 goto xdr_error;
3735
3736         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
3737                 goto xdr_error;
3738         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
3739                 goto xdr_error;
3740
3741         status = verify_attr_len(xdr, savep, attrlen);
3742 xdr_error:
3743         dprintk("%s: xdr returned %d!\n", __func__, -status);
3744         return status;
3745 }
3746
3747 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
3748                 const struct nfs_server *server, int may_sleep)
3749 {
3750         __be32 *savep;
3751         uint32_t attrlen,
3752                  bitmap[2] = {0},
3753                  type;
3754         int status;
3755         umode_t fmode = 0;
3756         uint64_t fileid;
3757
3758         status = decode_op_hdr(xdr, OP_GETATTR);
3759         if (status < 0)
3760                 goto xdr_error;
3761
3762         status = decode_attr_bitmap(xdr, bitmap);
3763         if (status < 0)
3764                 goto xdr_error;
3765
3766         status = decode_attr_length(xdr, &attrlen, &savep);
3767         if (status < 0)
3768                 goto xdr_error;
3769
3770
3771         status = decode_attr_type(xdr, bitmap, &type);
3772         if (status < 0)
3773                 goto xdr_error;
3774         fattr->mode = 0;
3775         if (status != 0) {
3776                 fattr->mode |= nfs_type2fmt[type];
3777                 fattr->valid |= status;
3778         }
3779
3780         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
3781         if (status < 0)
3782                 goto xdr_error;
3783         fattr->valid |= status;
3784
3785         status = decode_attr_size(xdr, bitmap, &fattr->size);
3786         if (status < 0)
3787                 goto xdr_error;
3788         fattr->valid |= status;
3789
3790         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
3791         if (status < 0)
3792                 goto xdr_error;
3793         fattr->valid |= status;
3794
3795         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
3796         if (status < 0)
3797                 goto xdr_error;
3798         fattr->valid |= status;
3799
3800         status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
3801                                                 struct nfs4_fs_locations,
3802                                                 fattr));
3803         if (status < 0)
3804                 goto xdr_error;
3805         fattr->valid |= status;
3806
3807         status = decode_attr_mode(xdr, bitmap, &fmode);
3808         if (status < 0)
3809                 goto xdr_error;
3810         if (status != 0) {
3811                 fattr->mode |= fmode;
3812                 fattr->valid |= status;
3813         }
3814
3815         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
3816         if (status < 0)
3817                 goto xdr_error;
3818         fattr->valid |= status;
3819
3820         status = decode_attr_owner(xdr, bitmap, server->nfs_client,
3821                         &fattr->uid, may_sleep);
3822         if (status < 0)
3823                 goto xdr_error;
3824         fattr->valid |= status;
3825
3826         status = decode_attr_group(xdr, bitmap, server->nfs_client,
3827                         &fattr->gid, may_sleep);
3828         if (status < 0)
3829                 goto xdr_error;
3830         fattr->valid |= status;
3831
3832         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
3833         if (status < 0)
3834                 goto xdr_error;
3835         fattr->valid |= status;
3836
3837         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
3838         if (status < 0)
3839                 goto xdr_error;
3840         fattr->valid |= status;
3841
3842         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
3843         if (status < 0)
3844                 goto xdr_error;
3845         fattr->valid |= status;
3846
3847         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
3848         if (status < 0)
3849                 goto xdr_error;
3850         fattr->valid |= status;
3851
3852         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
3853         if (status < 0)
3854                 goto xdr_error;
3855         fattr->valid |= status;
3856
3857         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid);
3858         if (status < 0)
3859                 goto xdr_error;
3860         if (status != 0 && !(fattr->valid & status)) {
3861                 fattr->fileid = fileid;
3862                 fattr->valid |= status;
3863         }
3864
3865         status = verify_attr_len(xdr, savep, attrlen);
3866 xdr_error:
3867         dprintk("%s: xdr returned %d\n", __func__, -status);
3868         return status;
3869 }
3870
3871
3872 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
3873 {
3874         __be32 *savep;
3875         uint32_t attrlen, bitmap[2];
3876         int status;
3877
3878         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3879                 goto xdr_error;
3880         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3881                 goto xdr_error;
3882         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3883                 goto xdr_error;
3884
3885         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
3886
3887         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
3888                 goto xdr_error;
3889         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
3890                 goto xdr_error;
3891         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
3892                 goto xdr_error;
3893         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
3894         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
3895                 goto xdr_error;
3896         fsinfo->wtpref = fsinfo->wtmax;
3897
3898         status = verify_attr_len(xdr, savep, attrlen);
3899 xdr_error:
3900         dprintk("%s: xdr returned %d!\n", __func__, -status);
3901         return status;
3902 }
3903
3904 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
3905 {
3906         __be32 *p;
3907         uint32_t len;
3908         int status;
3909
3910         /* Zero handle first to allow comparisons */
3911         memset(fh, 0, sizeof(*fh));
3912
3913         status = decode_op_hdr(xdr, OP_GETFH);
3914         if (status)
3915                 return status;
3916
3917         p = xdr_inline_decode(xdr, 4);
3918         if (unlikely(!p))
3919                 goto out_overflow;
3920         len = be32_to_cpup(p);
3921         if (len > NFS4_FHSIZE)
3922                 return -EIO;
3923         fh->size = len;
3924         p = xdr_inline_decode(xdr, len);
3925         if (unlikely(!p))
3926                 goto out_overflow;
3927         memcpy(fh->data, p, len);
3928         return 0;
3929 out_overflow:
3930         print_overflow_msg(__func__, xdr);
3931         return -EIO;
3932 }
3933
3934 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3935 {
3936         int status;
3937
3938         status = decode_op_hdr(xdr, OP_LINK);
3939         if (status)
3940                 return status;
3941         return decode_change_info(xdr, cinfo);
3942 }
3943
3944 /*
3945  * We create the owner, so we know a proper owner.id length is 4.
3946  */
3947 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
3948 {
3949         uint64_t offset, length, clientid;
3950         __be32 *p;
3951         uint32_t namelen, type;
3952
3953         p = xdr_inline_decode(xdr, 32);
3954         if (unlikely(!p))
3955                 goto out_overflow;
3956         p = xdr_decode_hyper(p, &offset);
3957         p = xdr_decode_hyper(p, &length);
3958         type = be32_to_cpup(p++);
3959         if (fl != NULL) {
3960                 fl->fl_start = (loff_t)offset;
3961                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
3962                 if (length == ~(uint64_t)0)
3963                         fl->fl_end = OFFSET_MAX;
3964                 fl->fl_type = F_WRLCK;
3965                 if (type & 1)
3966                         fl->fl_type = F_RDLCK;
3967                 fl->fl_pid = 0;
3968         }
3969         p = xdr_decode_hyper(p, &clientid);
3970         namelen = be32_to_cpup(p);
3971         p = xdr_inline_decode(xdr, namelen);
3972         if (likely(p))
3973                 return -NFS4ERR_DENIED;
3974 out_overflow:
3975         print_overflow_msg(__func__, xdr);
3976         return -EIO;
3977 }
3978
3979 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
3980 {
3981         int status;
3982
3983         status = decode_op_hdr(xdr, OP_LOCK);
3984         if (status == -EIO)
3985                 goto out;
3986         if (status == 0) {
3987                 status = decode_stateid(xdr, &res->stateid);
3988                 if (unlikely(status))
3989                         goto out;
3990         } else if (status == -NFS4ERR_DENIED)
3991                 status = decode_lock_denied(xdr, NULL);
3992         if (res->open_seqid != NULL)
3993                 nfs_increment_open_seqid(status, res->open_seqid);
3994         nfs_increment_lock_seqid(status, res->lock_seqid);
3995 out:
3996         return status;
3997 }
3998
3999 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4000 {
4001         int status;
4002         status = decode_op_hdr(xdr, OP_LOCKT);
4003         if (status == -NFS4ERR_DENIED)
4004                 return decode_lock_denied(xdr, res->denied);
4005         return status;
4006 }
4007
4008 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4009 {
4010         int status;
4011
4012         status = decode_op_hdr(xdr, OP_LOCKU);
4013         if (status != -EIO)
4014                 nfs_increment_lock_seqid(status, res->seqid);
4015         if (status == 0)
4016                 status = decode_stateid(xdr, &res->stateid);
4017         return status;
4018 }
4019
4020 static int decode_release_lockowner(struct xdr_stream *xdr)
4021 {
4022         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4023 }
4024
4025 static int decode_lookup(struct xdr_stream *xdr)
4026 {
4027         return decode_op_hdr(xdr, OP_LOOKUP);
4028 }
4029
4030 /* This is too sick! */
4031 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4032 {
4033         __be32 *p;
4034         uint32_t limit_type, nblocks, blocksize;
4035
4036         p = xdr_inline_decode(xdr, 12);
4037         if (unlikely(!p))
4038                 goto out_overflow;
4039         limit_type = be32_to_cpup(p++);
4040         switch (limit_type) {
4041         case 1:
4042                 xdr_decode_hyper(p, maxsize);
4043                 break;
4044         case 2:
4045                 nblocks = be32_to_cpup(p++);
4046                 blocksize = be32_to_cpup(p);
4047                 *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4048         }
4049         return 0;
4050 out_overflow:
4051         print_overflow_msg(__func__, xdr);
4052         return -EIO;
4053 }
4054
4055 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4056 {
4057         __be32 *p;
4058         uint32_t delegation_type;
4059         int status;
4060
4061         p = xdr_inline_decode(xdr, 4);
4062         if (unlikely(!p))
4063                 goto out_overflow;
4064         delegation_type = be32_to_cpup(p);
4065         if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
4066                 res->delegation_type = 0;
4067                 return 0;
4068         }
4069         status = decode_stateid(xdr, &res->delegation);
4070         if (unlikely(status))
4071                 return status;
4072         p = xdr_inline_decode(xdr, 4);
4073         if (unlikely(!p))
4074                 goto out_overflow;
4075         res->do_recall = be32_to_cpup(p);
4076
4077         switch (delegation_type) {
4078         case NFS4_OPEN_DELEGATE_READ:
4079                 res->delegation_type = FMODE_READ;
4080                 break;
4081         case NFS4_OPEN_DELEGATE_WRITE:
4082                 res->delegation_type = FMODE_WRITE|FMODE_READ;
4083                 if (decode_space_limit(xdr, &res->maxsize) < 0)
4084                                 return -EIO;
4085         }
4086         return decode_ace(xdr, NULL, res->server->nfs_client);
4087 out_overflow:
4088         print_overflow_msg(__func__, xdr);
4089         return -EIO;
4090 }
4091
4092 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
4093 {
4094         __be32 *p;
4095         uint32_t savewords, bmlen, i;
4096         int status;
4097
4098         status = decode_op_hdr(xdr, OP_OPEN);
4099         if (status != -EIO)
4100                 nfs_increment_open_seqid(status, res->seqid);
4101         if (!status)
4102                 status = decode_stateid(xdr, &res->stateid);
4103         if (unlikely(status))
4104                 return status;
4105
4106         decode_change_info(xdr, &res->cinfo);
4107
4108         p = xdr_inline_decode(xdr, 8);
4109         if (unlikely(!p))
4110                 goto out_overflow;
4111         res->rflags = be32_to_cpup(p++);
4112         bmlen = be32_to_cpup(p);
4113         if (bmlen > 10)
4114                 goto xdr_error;
4115
4116         p = xdr_inline_decode(xdr, bmlen << 2);
4117         if (unlikely(!p))
4118                 goto out_overflow;
4119         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
4120         for (i = 0; i < savewords; ++i)
4121                 res->attrset[i] = be32_to_cpup(p++);
4122         for (; i < NFS4_BITMAP_SIZE; i++)
4123                 res->attrset[i] = 0;
4124
4125         return decode_delegation(xdr, res);
4126 xdr_error:
4127         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
4128         return -EIO;
4129 out_overflow:
4130         print_overflow_msg(__func__, xdr);
4131         return -EIO;
4132 }
4133
4134 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
4135 {
4136         int status;
4137
4138         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
4139         if (status != -EIO)
4140                 nfs_increment_open_seqid(status, res->seqid);
4141         if (!status)
4142                 status = decode_stateid(xdr, &res->stateid);
4143         return status;
4144 }
4145
4146 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
4147 {
4148         int status;
4149
4150         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
4151         if (status != -EIO)
4152                 nfs_increment_open_seqid(status, res->seqid);
4153         if (!status)
4154                 status = decode_stateid(xdr, &res->stateid);
4155         return status;
4156 }
4157
4158 static int decode_putfh(struct xdr_stream *xdr)
4159 {
4160         return decode_op_hdr(xdr, OP_PUTFH);
4161 }
4162
4163 static int decode_putrootfh(struct xdr_stream *xdr)
4164 {
4165         return decode_op_hdr(xdr, OP_PUTROOTFH);
4166 }
4167
4168 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
4169 {
4170         struct kvec *iov = req->rq_rcv_buf.head;
4171         __be32 *p;
4172         uint32_t count, eof, recvd, hdrlen;
4173         int status;
4174
4175         status = decode_op_hdr(xdr, OP_READ);
4176         if (status)
4177                 return status;
4178         p = xdr_inline_decode(xdr, 8);
4179         if (unlikely(!p))
4180                 goto out_overflow;
4181         eof = be32_to_cpup(p++);
4182         count = be32_to_cpup(p);
4183         hdrlen = (u8 *) p - (u8 *) iov->iov_base;
4184         recvd = req->rq_rcv_buf.len - hdrlen;
4185         if (count > recvd) {
4186                 dprintk("NFS: server cheating in read reply: "
4187                                 "count %u > recvd %u\n", count, recvd);
4188                 count = recvd;
4189                 eof = 0;
4190         }
4191         xdr_read_pages(xdr, count);
4192         res->eof = eof;
4193         res->count = count;
4194         return 0;
4195 out_overflow:
4196         print_overflow_msg(__func__, xdr);
4197         return -EIO;
4198 }
4199
4200 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
4201 {
4202         struct xdr_buf  *rcvbuf = &req->rq_rcv_buf;
4203         struct page     *page = *rcvbuf->pages;
4204         struct kvec     *iov = rcvbuf->head;
4205         size_t          hdrlen;
4206         u32             recvd, pglen = rcvbuf->page_len;
4207         __be32          *end, *entry, *p, *kaddr;
4208         unsigned int    nr = 0;
4209         int             status;
4210
4211         status = decode_op_hdr(xdr, OP_READDIR);
4212         if (!status)
4213                 status = decode_verifier(xdr, readdir->verifier.data);
4214         if (unlikely(status))
4215                 return status;
4216         dprintk("%s: verifier = %08x:%08x\n",
4217                         __func__,
4218                         ((u32 *)readdir->verifier.data)[0],
4219                         ((u32 *)readdir->verifier.data)[1]);
4220
4221
4222         hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4223         recvd = rcvbuf->len - hdrlen;
4224         if (pglen > recvd)
4225                 pglen = recvd;
4226         xdr_read_pages(xdr, pglen);
4227
4228         BUG_ON(pglen + readdir->pgbase > PAGE_CACHE_SIZE);
4229         kaddr = p = kmap_atomic(page, KM_USER0);
4230         end = p + ((pglen + readdir->pgbase) >> 2);
4231         entry = p;
4232
4233         /* Make sure the packet actually has a value_follows and EOF entry */
4234         if ((entry + 1) > end)
4235                 goto short_pkt;
4236
4237         for (; *p++; nr++) {
4238                 u32 len, attrlen, xlen;
4239                 if (end - p < 3)
4240                         goto short_pkt;
4241                 dprintk("cookie = %Lu, ", *((unsigned long long *)p));
4242                 p += 2;                 /* cookie */
4243                 len = ntohl(*p++);      /* filename length */
4244                 if (len > NFS4_MAXNAMLEN) {
4245                         dprintk("NFS: giant filename in readdir (len 0x%x)\n",
4246                                         len);
4247                         goto err_unmap;
4248                 }
4249                 xlen = XDR_QUADLEN(len);
4250                 if (end - p < xlen + 1)
4251                         goto short_pkt;
4252                 dprintk("filename = %*s\n", len, (char *)p);
4253                 p += xlen;
4254                 len = ntohl(*p++);      /* bitmap length */
4255                 if (end - p < len + 1)
4256                         goto short_pkt;
4257                 p += len;
4258                 attrlen = XDR_QUADLEN(ntohl(*p++));
4259                 if (end - p < attrlen + 2)
4260                         goto short_pkt;
4261                 p += attrlen;           /* attributes */
4262                 entry = p;
4263         }
4264         /*
4265          * Apparently some server sends responses that are a valid size, but
4266          * contain no entries, and have value_follows==0 and EOF==0. For
4267          * those, just set the EOF marker.
4268          */
4269         if (!nr && entry[1] == 0) {
4270                 dprintk("NFS: readdir reply truncated!\n");
4271                 entry[1] = 1;
4272         }
4273 out:
4274         kunmap_atomic(kaddr, KM_USER0);
4275         return 0;
4276 short_pkt:
4277         /*
4278          * When we get a short packet there are 2 possibilities. We can
4279          * return an error, or fix up the response to look like a valid
4280          * response and return what we have so far. If there are no
4281          * entries and the packet was short, then return -EIO. If there
4282          * are valid entries in the response, return them and pretend that
4283          * the call was successful, but incomplete. The caller can retry the
4284          * readdir starting at the last cookie.
4285          */
4286         dprintk("%s: short packet at entry %d\n", __func__, nr);
4287         entry[0] = entry[1] = 0;
4288         if (nr)
4289                 goto out;
4290 err_unmap:
4291         kunmap_atomic(kaddr, KM_USER0);
4292         return -errno_NFSERR_IO;
4293 }
4294
4295 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
4296 {
4297         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
4298         struct kvec *iov = rcvbuf->head;
4299         size_t hdrlen;
4300         u32 len, recvd;
4301         __be32 *p;
4302         char *kaddr;
4303         int status;
4304
4305         status = decode_op_hdr(xdr, OP_READLINK);
4306         if (status)
4307                 return status;
4308
4309         /* Convert length of symlink */
4310         p = xdr_inline_decode(xdr, 4);
4311         if (unlikely(!p))
4312                 goto out_overflow;
4313         len = be32_to_cpup(p);
4314         if (len >= rcvbuf->page_len || len <= 0) {
4315                 dprintk("nfs: server returned giant symlink!\n");
4316                 return -ENAMETOOLONG;
4317         }
4318         hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4319         recvd = req->rq_rcv_buf.len - hdrlen;
4320         if (recvd < len) {
4321                 dprintk("NFS: server cheating in readlink reply: "
4322                                 "count %u > recvd %u\n", len, recvd);
4323                 return -EIO;
4324         }
4325         xdr_read_pages(xdr, len);
4326         /*
4327          * The XDR encode routine has set things up so that
4328          * the link text will be copied directly into the
4329          * buffer.  We just have to do overflow-checking,
4330          * and and null-terminate the text (the VFS expects
4331          * null-termination).
4332          */
4333         kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
4334         kaddr[len+rcvbuf->page_base] = '\0';
4335         kunmap_atomic(kaddr, KM_USER0);
4336         return 0;
4337 out_overflow:
4338         print_overflow_msg(__func__, xdr);
4339         return -EIO;
4340 }
4341
4342 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4343 {
4344         int status;
4345
4346         status = decode_op_hdr(xdr, OP_REMOVE);
4347         if (status)
4348                 goto out;
4349         status = decode_change_info(xdr, cinfo);
4350 out:
4351         return status;
4352 }
4353
4354 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
4355               struct nfs4_change_info *new_cinfo)
4356 {
4357         int status;
4358
4359         status = decode_op_hdr(xdr, OP_RENAME);
4360         if (status)
4361                 goto out;
4362         if ((status = decode_change_info(xdr, old_cinfo)))
4363                 goto out;
4364         status = decode_change_info(xdr, new_cinfo);
4365 out:
4366         return status;
4367 }
4368
4369 static int decode_renew(struct xdr_stream *xdr)
4370 {
4371         return decode_op_hdr(xdr, OP_RENEW);
4372 }
4373
4374 static int
4375 decode_restorefh(struct xdr_stream *xdr)
4376 {
4377         return decode_op_hdr(xdr, OP_RESTOREFH);
4378 }
4379
4380 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
4381                 size_t *acl_len)
4382 {
4383         __be32 *savep;
4384         uint32_t attrlen,
4385                  bitmap[2] = {0};
4386         struct kvec *iov = req->rq_rcv_buf.head;
4387         int status;
4388
4389         *acl_len = 0;
4390         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4391                 goto out;
4392         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4393                 goto out;
4394         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4395                 goto out;
4396
4397         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
4398                 return -EIO;
4399         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
4400                 size_t hdrlen;
4401                 u32 recvd;
4402
4403                 /* We ignore &savep and don't do consistency checks on
4404                  * the attr length.  Let userspace figure it out.... */
4405                 hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
4406                 recvd = req->rq_rcv_buf.len - hdrlen;
4407                 if (attrlen > recvd) {
4408                         dprintk("NFS: server cheating in getattr"
4409                                         " acl reply: attrlen %u > recvd %u\n",
4410                                         attrlen, recvd);
4411                         return -EINVAL;
4412                 }
4413                 xdr_read_pages(xdr, attrlen);
4414                 *acl_len = attrlen;
4415         } else
4416                 status = -EOPNOTSUPP;
4417
4418 out:
4419         return status;
4420 }
4421
4422 static int
4423 decode_savefh(struct xdr_stream *xdr)
4424 {
4425         return decode_op_hdr(xdr, OP_SAVEFH);
4426 }
4427
4428 static int decode_setattr(struct xdr_stream *xdr)
4429 {
4430         __be32 *p;
4431         uint32_t bmlen;
4432         int status;
4433
4434         status = decode_op_hdr(xdr, OP_SETATTR);
4435         if (status)
4436                 return status;
4437         p = xdr_inline_decode(xdr, 4);
4438         if (unlikely(!p))
4439                 goto out_overflow;
4440         bmlen = be32_to_cpup(p);
4441         p = xdr_inline_decode(xdr, bmlen << 2);
4442         if (likely(p))
4443                 return 0;
4444 out_overflow:
4445         print_overflow_msg(__func__, xdr);
4446         return -EIO;
4447 }
4448
4449 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
4450 {
4451         __be32 *p;
4452         uint32_t opnum;
4453         int32_t nfserr;
4454
4455         p = xdr_inline_decode(xdr, 8);
4456         if (unlikely(!p))
4457                 goto out_overflow;
4458         opnum = be32_to_cpup(p++);
4459         if (opnum != OP_SETCLIENTID) {
4460                 dprintk("nfs: decode_setclientid: Server returned operation"
4461                         " %d\n", opnum);
4462                 return -EIO;
4463         }
4464         nfserr = be32_to_cpup(p);
4465         if (nfserr == NFS_OK) {
4466                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
4467                 if (unlikely(!p))
4468                         goto out_overflow;
4469                 p = xdr_decode_hyper(p, &res->clientid);
4470                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
4471         } else if (nfserr == NFSERR_CLID_INUSE) {
4472                 uint32_t len;
4473
4474                 /* skip netid string */
4475                 p = xdr_inline_decode(xdr, 4);
4476                 if (unlikely(!p))
4477                         goto out_overflow;
4478                 len = be32_to_cpup(p);
4479                 p = xdr_inline_decode(xdr, len);
4480                 if (unlikely(!p))
4481                         goto out_overflow;
4482
4483                 /* skip uaddr string */
4484                 p = xdr_inline_decode(xdr, 4);
4485                 if (unlikely(!p))
4486                         goto out_overflow;
4487                 len = be32_to_cpup(p);
4488                 p = xdr_inline_decode(xdr, len);
4489                 if (unlikely(!p))
4490                         goto out_overflow;
4491                 return -NFSERR_CLID_INUSE;
4492         } else
4493                 return nfs4_stat_to_errno(nfserr);
4494
4495         return 0;
4496 out_overflow:
4497         print_overflow_msg(__func__, xdr);
4498         return -EIO;
4499 }
4500
4501 static int decode_setclientid_confirm(struct xdr_stream *xdr)
4502 {
4503         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
4504 }
4505
4506 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
4507 {
4508         __be32 *p;
4509         int status;
4510
4511         status = decode_op_hdr(xdr, OP_WRITE);
4512         if (status)
4513                 return status;
4514
4515         p = xdr_inline_decode(xdr, 16);
4516         if (unlikely(!p))
4517                 goto out_overflow;
4518         res->count = be32_to_cpup(p++);
4519         res->verf->committed = be32_to_cpup(p++);
4520         memcpy(res->verf->verifier, p, 8);
4521         return 0;
4522 out_overflow:
4523         print_overflow_msg(__func__, xdr);
4524         return -EIO;
4525 }
4526
4527 static int decode_delegreturn(struct xdr_stream *xdr)
4528 {
4529         return decode_op_hdr(xdr, OP_DELEGRETURN);
4530 }
4531
4532 #if defined(CONFIG_NFS_V4_1)
4533 static int decode_exchange_id(struct xdr_stream *xdr,
4534                               struct nfs41_exchange_id_res *res)
4535 {
4536         __be32 *p;
4537         uint32_t dummy;
4538         char *dummy_str;
4539         int status;
4540         struct nfs_client *clp = res->client;
4541
4542         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
4543         if (status)
4544                 return status;
4545
4546         p = xdr_inline_decode(xdr, 8);
4547         if (unlikely(!p))
4548                 goto out_overflow;
4549         xdr_decode_hyper(p, &clp->cl_ex_clid);
4550         p = xdr_inline_decode(xdr, 12);
4551         if (unlikely(!p))
4552                 goto out_overflow;
4553         clp->cl_seqid = be32_to_cpup(p++);
4554         clp->cl_exchange_flags = be32_to_cpup(p++);
4555
4556         /* We ask for SP4_NONE */
4557         dummy = be32_to_cpup(p);
4558         if (dummy != SP4_NONE)
4559                 return -EIO;
4560
4561         /* Throw away minor_id */
4562         p = xdr_inline_decode(xdr, 8);
4563         if (unlikely(!p))
4564                 goto out_overflow;
4565
4566         /* Throw away Major id */
4567         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4568         if (unlikely(status))
4569                 return status;
4570
4571         /* Throw away server_scope */
4572         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4573         if (unlikely(status))
4574                 return status;
4575
4576         /* Throw away Implementation id array */
4577         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4578         if (unlikely(status))
4579                 return status;
4580
4581         return 0;
4582 out_overflow:
4583         print_overflow_msg(__func__, xdr);
4584         return -EIO;
4585 }
4586
4587 static int decode_chan_attrs(struct xdr_stream *xdr,
4588                              struct nfs4_channel_attrs *attrs)
4589 {
4590         __be32 *p;
4591         u32 nr_attrs;
4592
4593         p = xdr_inline_decode(xdr, 28);
4594         if (unlikely(!p))
4595                 goto out_overflow;
4596         attrs->headerpadsz = be32_to_cpup(p++);
4597         attrs->max_rqst_sz = be32_to_cpup(p++);
4598         attrs->max_resp_sz = be32_to_cpup(p++);
4599         attrs->max_resp_sz_cached = be32_to_cpup(p++);
4600         attrs->max_ops = be32_to_cpup(p++);
4601         attrs->max_reqs = be32_to_cpup(p++);
4602         nr_attrs = be32_to_cpup(p);
4603         if (unlikely(nr_attrs > 1)) {
4604                 printk(KERN_WARNING "%s: Invalid rdma channel attrs count %u\n",
4605                         __func__, nr_attrs);
4606                 return -EINVAL;
4607         }
4608         if (nr_attrs == 1) {
4609                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
4610                 if (unlikely(!p))
4611                         goto out_overflow;
4612         }
4613         return 0;
4614 out_overflow:
4615         print_overflow_msg(__func__, xdr);
4616         return -EIO;
4617 }
4618
4619 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
4620 {
4621         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
4622 }
4623
4624 static int decode_create_session(struct xdr_stream *xdr,
4625                                  struct nfs41_create_session_res *res)
4626 {
4627         __be32 *p;
4628         int status;
4629         struct nfs_client *clp = res->client;
4630         struct nfs4_session *session = clp->cl_session;
4631
4632         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
4633         if (!status)
4634                 status = decode_sessionid(xdr, &session->sess_id);
4635         if (unlikely(status))
4636                 return status;
4637
4638         /* seqid, flags */
4639         p = xdr_inline_decode(xdr, 8);
4640         if (unlikely(!p))
4641                 goto out_overflow;
4642         clp->cl_seqid = be32_to_cpup(p++);
4643         session->flags = be32_to_cpup(p);
4644
4645         /* Channel attributes */
4646         status = decode_chan_attrs(xdr, &session->fc_attrs);
4647         if (!status)
4648                 status = decode_chan_attrs(xdr, &session->bc_attrs);
4649         return status;
4650 out_overflow:
4651         print_overflow_msg(__func__, xdr);
4652         return -EIO;
4653 }
4654
4655 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
4656 {
4657         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
4658 }
4659
4660 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
4661 {
4662         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
4663 }
4664 #endif /* CONFIG_NFS_V4_1 */
4665
4666 static int decode_sequence(struct xdr_stream *xdr,
4667                            struct nfs4_sequence_res *res,
4668                            struct rpc_rqst *rqstp)
4669 {
4670 #if defined(CONFIG_NFS_V4_1)
4671         struct nfs4_slot *slot;
4672         struct nfs4_sessionid id;
4673         u32 dummy;
4674         int status;
4675         __be32 *p;
4676
4677         if (!res->sr_session)
4678                 return 0;
4679
4680         status = decode_op_hdr(xdr, OP_SEQUENCE);
4681         if (!status)
4682                 status = decode_sessionid(xdr, &id);
4683         if (unlikely(status))
4684                 goto out_err;
4685
4686         /*
4687          * If the server returns different values for sessionID, slotID or
4688          * sequence number, the server is looney tunes.
4689          */
4690         status = -EREMOTEIO;
4691
4692         if (memcmp(id.data, res->sr_session->sess_id.data,
4693                    NFS4_MAX_SESSIONID_LEN)) {
4694                 dprintk("%s Invalid session id\n", __func__);
4695                 goto out_err;
4696         }
4697
4698         p = xdr_inline_decode(xdr, 20);
4699         if (unlikely(!p))
4700                 goto out_overflow;
4701
4702         /* seqid */
4703         slot = &res->sr_session->fc_slot_table.slots[res->sr_slotid];
4704         dummy = be32_to_cpup(p++);
4705         if (dummy != slot->seq_nr) {
4706                 dprintk("%s Invalid sequence number\n", __func__);
4707                 goto out_err;
4708         }
4709         /* slot id */
4710         dummy = be32_to_cpup(p++);
4711         if (dummy != res->sr_slotid) {
4712                 dprintk("%s Invalid slot id\n", __func__);
4713                 goto out_err;
4714         }
4715         /* highest slot id - currently not processed */
4716         dummy = be32_to_cpup(p++);
4717         /* target highest slot id - currently not processed */
4718         dummy = be32_to_cpup(p++);
4719         /* result flags */
4720         res->sr_status_flags = be32_to_cpup(p);
4721         status = 0;
4722 out_err:
4723         res->sr_status = status;
4724         return status;
4725 out_overflow:
4726         print_overflow_msg(__func__, xdr);
4727         status = -EIO;
4728         goto out_err;
4729 #else  /* CONFIG_NFS_V4_1 */
4730         return 0;
4731 #endif /* CONFIG_NFS_V4_1 */
4732 }
4733
4734 /*
4735  * END OF "GENERIC" DECODE ROUTINES.
4736  */
4737
4738 /*
4739  * Decode OPEN_DOWNGRADE response
4740  */
4741 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
4742 {
4743         struct xdr_stream xdr;
4744         struct compound_hdr hdr;
4745         int status;
4746
4747         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4748         status = decode_compound_hdr(&xdr, &hdr);
4749         if (status)
4750                 goto out;
4751         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4752         if (status)
4753                 goto out;
4754         status = decode_putfh(&xdr);
4755         if (status)
4756                 goto out;
4757         status = decode_open_downgrade(&xdr, res);
4758         if (status != 0)
4759                 goto out;
4760         decode_getfattr(&xdr, res->fattr, res->server,
4761                         !RPC_IS_ASYNC(rqstp->rq_task));
4762 out:
4763         return status;
4764 }
4765
4766 /*
4767  * Decode ACCESS response
4768  */
4769 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_accessres *res)
4770 {
4771         struct xdr_stream xdr;
4772         struct compound_hdr hdr;
4773         int status;
4774
4775         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4776         status = decode_compound_hdr(&xdr, &hdr);
4777         if (status)
4778                 goto out;
4779         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4780         if (status)
4781                 goto out;
4782         status = decode_putfh(&xdr);
4783         if (status != 0)
4784                 goto out;
4785         status = decode_access(&xdr, res);
4786         if (status != 0)
4787                 goto out;
4788         decode_getfattr(&xdr, res->fattr, res->server,
4789                         !RPC_IS_ASYNC(rqstp->rq_task));
4790 out:
4791         return status;
4792 }
4793
4794 /*
4795  * Decode LOOKUP response
4796  */
4797 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
4798 {
4799         struct xdr_stream xdr;
4800         struct compound_hdr hdr;
4801         int status;
4802
4803         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4804         status = decode_compound_hdr(&xdr, &hdr);
4805         if (status)
4806                 goto out;
4807         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4808         if (status)
4809                 goto out;
4810         if ((status = decode_putfh(&xdr)) != 0)
4811                 goto out;
4812         if ((status = decode_lookup(&xdr)) != 0)
4813                 goto out;
4814         if ((status = decode_getfh(&xdr, res->fh)) != 0)
4815                 goto out;
4816         status = decode_getfattr(&xdr, res->fattr, res->server
4817                         ,!RPC_IS_ASYNC(rqstp->rq_task));
4818 out:
4819         return status;
4820 }
4821
4822 /*
4823  * Decode LOOKUP_ROOT response
4824  */
4825 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
4826 {
4827         struct xdr_stream xdr;
4828         struct compound_hdr hdr;
4829         int status;
4830
4831         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4832         status = decode_compound_hdr(&xdr, &hdr);
4833         if (status)
4834                 goto out;
4835         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4836         if (status)
4837                 goto out;
4838         if ((status = decode_putrootfh(&xdr)) != 0)
4839                 goto out;
4840         if ((status = decode_getfh(&xdr, res->fh)) == 0)
4841                 status = decode_getfattr(&xdr, res->fattr, res->server,
4842                                 !RPC_IS_ASYNC(rqstp->rq_task));
4843 out:
4844         return status;
4845 }
4846
4847 /*
4848  * Decode REMOVE response
4849  */
4850 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, __be32 *p, struct nfs_removeres *res)
4851 {
4852         struct xdr_stream xdr;
4853         struct compound_hdr hdr;
4854         int status;
4855
4856         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4857         status = decode_compound_hdr(&xdr, &hdr);
4858         if (status)
4859                 goto out;
4860         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4861         if (status)
4862                 goto out;
4863         if ((status = decode_putfh(&xdr)) != 0)
4864                 goto out;
4865         if ((status = decode_remove(&xdr, &res->cinfo)) != 0)
4866                 goto out;
4867         decode_getfattr(&xdr, res->dir_attr, res->server,
4868                         !RPC_IS_ASYNC(rqstp->rq_task));
4869 out:
4870         return status;
4871 }
4872
4873 /*
4874  * Decode RENAME response
4875  */
4876 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_rename_res *res)
4877 {
4878         struct xdr_stream xdr;
4879         struct compound_hdr hdr;
4880         int status;
4881
4882         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4883         status = decode_compound_hdr(&xdr, &hdr);
4884         if (status)
4885                 goto out;
4886         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4887         if (status)
4888                 goto out;
4889         if ((status = decode_putfh(&xdr)) != 0)
4890                 goto out;
4891         if ((status = decode_savefh(&xdr)) != 0)
4892                 goto out;
4893         if ((status = decode_putfh(&xdr)) != 0)
4894                 goto out;
4895         if ((status = decode_rename(&xdr, &res->old_cinfo, &res->new_cinfo)) != 0)
4896                 goto out;
4897         /* Current FH is target directory */
4898         if (decode_getfattr(&xdr, res->new_fattr, res->server,
4899                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4900                 goto out;
4901         if ((status = decode_restorefh(&xdr)) != 0)
4902                 goto out;
4903         decode_getfattr(&xdr, res->old_fattr, res->server,
4904                         !RPC_IS_ASYNC(rqstp->rq_task));
4905 out:
4906         return status;
4907 }
4908
4909 /*
4910  * Decode LINK response
4911  */
4912 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_link_res *res)
4913 {
4914         struct xdr_stream xdr;
4915         struct compound_hdr hdr;
4916         int status;
4917
4918         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4919         status = decode_compound_hdr(&xdr, &hdr);
4920         if (status)
4921                 goto out;
4922         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4923         if (status)
4924                 goto out;
4925         if ((status = decode_putfh(&xdr)) != 0)
4926                 goto out;
4927         if ((status = decode_savefh(&xdr)) != 0)
4928                 goto out;
4929         if ((status = decode_putfh(&xdr)) != 0)
4930                 goto out;
4931         if ((status = decode_link(&xdr, &res->cinfo)) != 0)
4932                 goto out;
4933         /*
4934          * Note order: OP_LINK leaves the directory as the current
4935          *             filehandle.
4936          */
4937         if (decode_getfattr(&xdr, res->dir_attr, res->server,
4938                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4939                 goto out;
4940         if ((status = decode_restorefh(&xdr)) != 0)
4941                 goto out;
4942         decode_getfattr(&xdr, res->fattr, res->server,
4943                         !RPC_IS_ASYNC(rqstp->rq_task));
4944 out:
4945         return status;
4946 }
4947
4948 /*
4949  * Decode CREATE response
4950  */
4951 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
4952 {
4953         struct xdr_stream xdr;
4954         struct compound_hdr hdr;
4955         int status;
4956
4957         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4958         status = decode_compound_hdr(&xdr, &hdr);
4959         if (status)
4960                 goto out;
4961         status = decode_sequence(&xdr, &res->seq_res, rqstp);
4962         if (status)
4963                 goto out;
4964         if ((status = decode_putfh(&xdr)) != 0)
4965                 goto out;
4966         if ((status = decode_savefh(&xdr)) != 0)
4967                 goto out;
4968         if ((status = decode_create(&xdr,&res->dir_cinfo)) != 0)
4969                 goto out;
4970         if ((status = decode_getfh(&xdr, res->fh)) != 0)
4971                 goto out;
4972         if (decode_getfattr(&xdr, res->fattr, res->server,
4973                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4974                 goto out;
4975         if ((status = decode_restorefh(&xdr)) != 0)
4976                 goto out;
4977         decode_getfattr(&xdr, res->dir_fattr, res->server,
4978                         !RPC_IS_ASYNC(rqstp->rq_task));
4979 out:
4980         return status;
4981 }
4982
4983 /*
4984  * Decode SYMLINK response
4985  */
4986 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
4987 {
4988         return nfs4_xdr_dec_create(rqstp, p, res);
4989 }
4990
4991 /*
4992  * Decode GETATTR response
4993  */
4994 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_getattr_res *res)
4995 {
4996         struct xdr_stream xdr;
4997         struct compound_hdr hdr;
4998         int status;
4999
5000         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5001         status = decode_compound_hdr(&xdr, &hdr);
5002         if (status)
5003                 goto out;
5004         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5005         if (status)
5006                 goto out;
5007         status = decode_putfh(&xdr);
5008         if (status)
5009                 goto out;
5010         status = decode_getfattr(&xdr, res->fattr, res->server,
5011                         !RPC_IS_ASYNC(rqstp->rq_task));
5012 out:
5013         return status;
5014 }
5015
5016 /*
5017  * Encode an SETACL request
5018  */
5019 static int
5020 nfs4_xdr_enc_setacl(struct rpc_rqst *req, __be32 *p, struct nfs_setaclargs *args)
5021 {
5022         struct xdr_stream xdr;
5023         struct compound_hdr hdr = {
5024                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
5025         };
5026         int status;
5027
5028         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
5029         encode_compound_hdr(&xdr, req, &hdr);
5030         encode_sequence(&xdr, &args->seq_args, &hdr);
5031         encode_putfh(&xdr, args->fh, &hdr);
5032         status = encode_setacl(&xdr, args, &hdr);
5033         encode_nops(&hdr);
5034         return status;
5035 }
5036
5037 /*
5038  * Decode SETACL response
5039  */
5040 static int
5041 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, __be32 *p,
5042                     struct nfs_setaclres *res)
5043 {
5044         struct xdr_stream xdr;
5045         struct compound_hdr hdr;
5046         int status;
5047
5048         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5049         status = decode_compound_hdr(&xdr, &hdr);
5050         if (status)
5051                 goto out;
5052         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5053         if (status)
5054                 goto out;
5055         status = decode_putfh(&xdr);
5056         if (status)
5057                 goto out;
5058         status = decode_setattr(&xdr);
5059 out:
5060         return status;
5061 }
5062
5063 /*
5064  * Decode GETACL response
5065  */
5066 static int
5067 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, __be32 *p,
5068                     struct nfs_getaclres *res)
5069 {
5070         struct xdr_stream xdr;
5071         struct compound_hdr hdr;
5072         int status;
5073
5074         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5075         status = decode_compound_hdr(&xdr, &hdr);
5076         if (status)
5077                 goto out;
5078         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5079         if (status)
5080                 goto out;
5081         status = decode_putfh(&xdr);
5082         if (status)
5083                 goto out;
5084         status = decode_getacl(&xdr, rqstp, &res->acl_len);
5085
5086 out:
5087         return status;
5088 }
5089
5090 /*
5091  * Decode CLOSE response
5092  */
5093 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
5094 {
5095         struct xdr_stream xdr;
5096         struct compound_hdr hdr;
5097         int status;
5098
5099         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5100         status = decode_compound_hdr(&xdr, &hdr);
5101         if (status)
5102                 goto out;
5103         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5104         if (status)
5105                 goto out;
5106         status = decode_putfh(&xdr);
5107         if (status)
5108                 goto out;
5109         status = decode_close(&xdr, res);
5110         if (status != 0)
5111                 goto out;
5112         /*
5113          * Note: Server may do delete on close for this file
5114          *      in which case the getattr call will fail with
5115          *      an ESTALE error. Shouldn't be a problem,
5116          *      though, since fattr->valid will remain unset.
5117          */
5118         decode_getfattr(&xdr, res->fattr, res->server,
5119                         !RPC_IS_ASYNC(rqstp->rq_task));
5120 out:
5121         return status;
5122 }
5123
5124 /*
5125  * Decode OPEN response
5126  */
5127 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
5128 {
5129         struct xdr_stream xdr;
5130         struct compound_hdr hdr;
5131         int status;
5132
5133         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5134         status = decode_compound_hdr(&xdr, &hdr);
5135         if (status)
5136                 goto out;
5137         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5138         if (status)
5139                 goto out;
5140         status = decode_putfh(&xdr);
5141         if (status)
5142                 goto out;
5143         status = decode_savefh(&xdr);
5144         if (status)
5145                 goto out;
5146         status = decode_open(&xdr, res);
5147         if (status)
5148                 goto out;
5149         if (decode_getfh(&xdr, &res->fh) != 0)
5150                 goto out;
5151         if (decode_getfattr(&xdr, res->f_attr, res->server,
5152                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5153                 goto out;
5154         if (decode_restorefh(&xdr) != 0)
5155                 goto out;
5156         decode_getfattr(&xdr, res->dir_attr, res->server,
5157                         !RPC_IS_ASYNC(rqstp->rq_task));
5158 out:
5159         return status;
5160 }
5161
5162 /*
5163  * Decode OPEN_CONFIRM response
5164  */
5165 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp, __be32 *p, struct nfs_open_confirmres *res)
5166 {
5167         struct xdr_stream xdr;
5168         struct compound_hdr hdr;
5169         int status;
5170
5171         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5172         status = decode_compound_hdr(&xdr, &hdr);
5173         if (status)
5174                 goto out;
5175         status = decode_putfh(&xdr);
5176         if (status)
5177                 goto out;
5178         status = decode_open_confirm(&xdr, res);
5179 out:
5180         return status;
5181 }
5182
5183 /*
5184  * Decode OPEN response
5185  */
5186 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
5187 {
5188         struct xdr_stream xdr;
5189         struct compound_hdr hdr;
5190         int status;
5191
5192         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5193         status = decode_compound_hdr(&xdr, &hdr);
5194         if (status)
5195                 goto out;
5196         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5197         if (status)
5198                 goto out;
5199         status = decode_putfh(&xdr);
5200         if (status)
5201                 goto out;
5202         status = decode_open(&xdr, res);
5203         if (status)
5204                 goto out;
5205         decode_getfattr(&xdr, res->f_attr, res->server,
5206                         !RPC_IS_ASYNC(rqstp->rq_task));
5207 out:
5208         return status;
5209 }
5210
5211 /*
5212  * Decode SETATTR response
5213  */
5214 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs_setattrres *res)
5215 {
5216         struct xdr_stream xdr;
5217         struct compound_hdr hdr;
5218         int status;
5219
5220         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5221         status = decode_compound_hdr(&xdr, &hdr);
5222         if (status)
5223                 goto out;
5224         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5225         if (status)
5226                 goto out;
5227         status = decode_putfh(&xdr);
5228         if (status)
5229                 goto out;
5230         status = decode_setattr(&xdr);
5231         if (status)
5232                 goto out;
5233         decode_getfattr(&xdr, res->fattr, res->server,
5234                         !RPC_IS_ASYNC(rqstp->rq_task));
5235 out:
5236         return status;
5237 }
5238
5239 /*
5240  * Decode LOCK response
5241  */
5242 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, __be32 *p, struct nfs_lock_res *res)
5243 {
5244         struct xdr_stream xdr;
5245         struct compound_hdr hdr;
5246         int status;
5247
5248         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5249         status = decode_compound_hdr(&xdr, &hdr);
5250         if (status)
5251                 goto out;
5252         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5253         if (status)
5254                 goto out;
5255         status = decode_putfh(&xdr);
5256         if (status)
5257                 goto out;
5258         status = decode_lock(&xdr, res);
5259 out:
5260         return status;
5261 }
5262
5263 /*
5264  * Decode LOCKT response
5265  */
5266 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, __be32 *p, struct nfs_lockt_res *res)
5267 {
5268         struct xdr_stream xdr;
5269         struct compound_hdr hdr;
5270         int status;
5271
5272         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5273         status = decode_compound_hdr(&xdr, &hdr);
5274         if (status)
5275                 goto out;
5276         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5277         if (status)
5278                 goto out;
5279         status = decode_putfh(&xdr);
5280         if (status)
5281                 goto out;
5282         status = decode_lockt(&xdr, res);
5283 out:
5284         return status;
5285 }
5286
5287 /*
5288  * Decode LOCKU response
5289  */
5290 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, __be32 *p, struct nfs_locku_res *res)
5291 {
5292         struct xdr_stream xdr;
5293         struct compound_hdr hdr;
5294         int status;
5295
5296         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5297         status = decode_compound_hdr(&xdr, &hdr);
5298         if (status)
5299                 goto out;
5300         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5301         if (status)
5302                 goto out;
5303         status = decode_putfh(&xdr);
5304         if (status)
5305                 goto out;
5306         status = decode_locku(&xdr, res);
5307 out:
5308         return status;
5309 }
5310
5311 static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp, __be32 *p, void *dummy)
5312 {
5313         struct xdr_stream xdr;
5314         struct compound_hdr hdr;
5315         int status;
5316
5317         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5318         status = decode_compound_hdr(&xdr, &hdr);
5319         if (!status)
5320                 status = decode_release_lockowner(&xdr);
5321         return status;
5322 }
5323
5324 /*
5325  * Decode READLINK response
5326  */
5327 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp, __be32 *p,
5328                                  struct nfs4_readlink_res *res)
5329 {
5330         struct xdr_stream xdr;
5331         struct compound_hdr hdr;
5332         int status;
5333
5334         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5335         status = decode_compound_hdr(&xdr, &hdr);
5336         if (status)
5337                 goto out;
5338         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5339         if (status)
5340                 goto out;
5341         status = decode_putfh(&xdr);
5342         if (status)
5343                 goto out;
5344         status = decode_readlink(&xdr, rqstp);
5345 out:
5346         return status;
5347 }
5348
5349 /*
5350  * Decode READDIR response
5351  */
5352 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_readdir_res *res)
5353 {
5354         struct xdr_stream xdr;
5355         struct compound_hdr hdr;
5356         int status;
5357
5358         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5359         status = decode_compound_hdr(&xdr, &hdr);
5360         if (status)
5361                 goto out;
5362         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5363         if (status)
5364                 goto out;
5365         status = decode_putfh(&xdr);
5366         if (status)
5367                 goto out;
5368         status = decode_readdir(&xdr, rqstp, res);
5369 out:
5370         return status;
5371 }
5372
5373 /*
5374  * Decode Read response
5375  */
5376 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, __be32 *p, struct nfs_readres *res)
5377 {
5378         struct xdr_stream xdr;
5379         struct compound_hdr hdr;
5380         int status;
5381
5382         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5383         status = decode_compound_hdr(&xdr, &hdr);
5384         if (status)
5385                 goto out;
5386         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5387         if (status)
5388                 goto out;
5389         status = decode_putfh(&xdr);
5390         if (status)
5391                 goto out;
5392         status = decode_read(&xdr, rqstp, res);
5393         if (!status)
5394                 status = res->count;
5395 out:
5396         return status;
5397 }
5398
5399 /*
5400  * Decode WRITE response
5401  */
5402 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, __be32 *p, struct nfs_writeres *res)
5403 {
5404         struct xdr_stream xdr;
5405         struct compound_hdr hdr;
5406         int status;
5407
5408         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5409         status = decode_compound_hdr(&xdr, &hdr);
5410         if (status)
5411                 goto out;
5412         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5413         if (status)
5414                 goto out;
5415         status = decode_putfh(&xdr);
5416         if (status)
5417                 goto out;
5418         status = decode_write(&xdr, res);
5419         if (status)
5420                 goto out;
5421         decode_getfattr(&xdr, res->fattr, res->server,
5422                         !RPC_IS_ASYNC(rqstp->rq_task));
5423         if (!status)
5424                 status = res->count;
5425 out:
5426         return status;
5427 }
5428
5429 /*
5430  * Decode COMMIT response
5431  */
5432 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, __be32 *p, struct nfs_writeres *res)
5433 {
5434         struct xdr_stream xdr;
5435         struct compound_hdr hdr;
5436         int status;
5437
5438         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5439         status = decode_compound_hdr(&xdr, &hdr);
5440         if (status)
5441                 goto out;
5442         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5443         if (status)
5444                 goto out;
5445         status = decode_putfh(&xdr);
5446         if (status)
5447                 goto out;
5448         status = decode_commit(&xdr, res);
5449         if (status)
5450                 goto out;
5451         decode_getfattr(&xdr, res->fattr, res->server,
5452                         !RPC_IS_ASYNC(rqstp->rq_task));
5453 out:
5454         return status;
5455 }
5456
5457 /*
5458  * Decode FSINFO response
5459  */
5460 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, __be32 *p,
5461                                struct nfs4_fsinfo_res *res)
5462 {
5463         struct xdr_stream xdr;
5464         struct compound_hdr hdr;
5465         int status;
5466
5467         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5468         status = decode_compound_hdr(&xdr, &hdr);
5469         if (!status)
5470                 status = decode_sequence(&xdr, &res->seq_res, req);
5471         if (!status)
5472                 status = decode_putfh(&xdr);
5473         if (!status)
5474                 status = decode_fsinfo(&xdr, res->fsinfo);
5475         return status;
5476 }
5477
5478 /*
5479  * Decode PATHCONF response
5480  */
5481 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, __be32 *p,
5482                                  struct nfs4_pathconf_res *res)
5483 {
5484         struct xdr_stream xdr;
5485         struct compound_hdr hdr;
5486         int status;
5487
5488         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5489         status = decode_compound_hdr(&xdr, &hdr);
5490         if (!status)
5491                 status = decode_sequence(&xdr, &res->seq_res, req);
5492         if (!status)
5493                 status = decode_putfh(&xdr);
5494         if (!status)
5495                 status = decode_pathconf(&xdr, res->pathconf);
5496         return status;
5497 }
5498
5499 /*
5500  * Decode STATFS response
5501  */
5502 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, __be32 *p,
5503                                struct nfs4_statfs_res *res)
5504 {
5505         struct xdr_stream xdr;
5506         struct compound_hdr hdr;
5507         int status;
5508
5509         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5510         status = decode_compound_hdr(&xdr, &hdr);
5511         if (!status)
5512                 status = decode_sequence(&xdr, &res->seq_res, req);
5513         if (!status)
5514                 status = decode_putfh(&xdr);
5515         if (!status)
5516                 status = decode_statfs(&xdr, res->fsstat);
5517         return status;
5518 }
5519
5520 /*
5521  * Decode GETATTR_BITMAP response
5522  */
5523 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req, __be32 *p, struct nfs4_server_caps_res *res)
5524 {
5525         struct xdr_stream xdr;
5526         struct compound_hdr hdr;
5527         int status;
5528
5529         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5530         status = decode_compound_hdr(&xdr, &hdr);
5531         if (status)
5532                 goto out;
5533         status = decode_sequence(&xdr, &res->seq_res, req);
5534         if (status)
5535                 goto out;
5536         if ((status = decode_putfh(&xdr)) != 0)
5537                 goto out;
5538         status = decode_server_caps(&xdr, res);
5539 out:
5540         return status;
5541 }
5542
5543 /*
5544  * Decode RENEW response
5545  */
5546 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, __be32 *p, void *dummy)
5547 {
5548         struct xdr_stream xdr;
5549         struct compound_hdr hdr;
5550         int status;
5551
5552         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5553         status = decode_compound_hdr(&xdr, &hdr);
5554         if (!status)
5555                 status = decode_renew(&xdr);
5556         return status;
5557 }
5558
5559 /*
5560  * Decode SETCLIENTID response
5561  */
5562 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req, __be32 *p,
5563                 struct nfs4_setclientid_res *res)
5564 {
5565         struct xdr_stream xdr;
5566         struct compound_hdr hdr;
5567         int status;
5568
5569         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5570         status = decode_compound_hdr(&xdr, &hdr);
5571         if (!status)
5572                 status = decode_setclientid(&xdr, res);
5573         return status;
5574 }
5575
5576 /*
5577  * Decode SETCLIENTID_CONFIRM response
5578  */
5579 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *fsinfo)
5580 {
5581         struct xdr_stream xdr;
5582         struct compound_hdr hdr;
5583         int status;
5584
5585         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5586         status = decode_compound_hdr(&xdr, &hdr);
5587         if (!status)
5588                 status = decode_setclientid_confirm(&xdr);
5589         if (!status)
5590                 status = decode_putrootfh(&xdr);
5591         if (!status)
5592                 status = decode_fsinfo(&xdr, fsinfo);
5593         return status;
5594 }
5595
5596 /*
5597  * Decode DELEGRETURN response
5598  */
5599 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_delegreturnres *res)
5600 {
5601         struct xdr_stream xdr;
5602         struct compound_hdr hdr;
5603         int status;
5604
5605         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5606         status = decode_compound_hdr(&xdr, &hdr);
5607         if (status)
5608                 goto out;
5609         status = decode_sequence(&xdr, &res->seq_res, rqstp);
5610         if (status)
5611                 goto out;
5612         status = decode_putfh(&xdr);
5613         if (status != 0)
5614                 goto out;
5615         status = decode_delegreturn(&xdr);
5616         if (status != 0)
5617                 goto out;
5618         decode_getfattr(&xdr, res->fattr, res->server,
5619                         !RPC_IS_ASYNC(rqstp->rq_task));
5620 out:
5621         return status;
5622 }
5623
5624 /*
5625  * Decode FS_LOCATIONS response
5626  */
5627 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, __be32 *p,
5628                                      struct nfs4_fs_locations_res *res)
5629 {
5630         struct xdr_stream xdr;
5631         struct compound_hdr hdr;
5632         int status;
5633
5634         xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5635         status = decode_compound_hdr(&xdr, &hdr);
5636         if (status)
5637                 goto out;
5638         status = decode_sequence(&xdr, &res->seq_res, req);
5639         if (status)
5640                 goto out;
5641         if ((status = decode_putfh(&xdr)) != 0)
5642                 goto out;
5643         if ((status = decode_lookup(&xdr)) != 0)
5644                 goto out;
5645         xdr_enter_page(&xdr, PAGE_SIZE);
5646         status = decode_getfattr(&xdr, &res->fs_locations->fattr,
5647                                  res->fs_locations->server,
5648                                  !RPC_IS_ASYNC(req->rq_task));
5649 out:
5650         return status;
5651 }
5652
5653 #if defined(CONFIG_NFS_V4_1)
5654 /*
5655  * Decode EXCHANGE_ID response
5656  */
5657 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp, uint32_t *p,
5658                                     void *res)
5659 {
5660         struct xdr_stream xdr;
5661         struct compound_hdr hdr;
5662         int status;
5663
5664         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5665         status = decode_compound_hdr(&xdr, &hdr);
5666         if (!status)
5667                 status = decode_exchange_id(&xdr, res);
5668         return status;
5669 }
5670
5671 /*
5672  * Decode CREATE_SESSION response
5673  */
5674 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp, uint32_t *p,
5675                                        struct nfs41_create_session_res *res)
5676 {
5677         struct xdr_stream xdr;
5678         struct compound_hdr hdr;
5679         int status;
5680
5681         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5682         status = decode_compound_hdr(&xdr, &hdr);
5683         if (!status)
5684                 status = decode_create_session(&xdr, res);
5685         return status;
5686 }
5687
5688 /*
5689  * Decode DESTROY_SESSION response
5690  */
5691 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp, uint32_t *p,
5692                                         void *dummy)
5693 {
5694         struct xdr_stream xdr;
5695         struct compound_hdr hdr;
5696         int status;
5697
5698         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5699         status = decode_compound_hdr(&xdr, &hdr);
5700         if (!status)
5701                 status = decode_destroy_session(&xdr, dummy);
5702         return status;
5703 }
5704
5705 /*
5706  * Decode SEQUENCE response
5707  */
5708 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp, uint32_t *p,
5709                                  struct nfs4_sequence_res *res)
5710 {
5711         struct xdr_stream xdr;
5712         struct compound_hdr hdr;
5713         int status;
5714
5715         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5716         status = decode_compound_hdr(&xdr, &hdr);
5717         if (!status)
5718                 status = decode_sequence(&xdr, res, rqstp);
5719         return status;
5720 }
5721
5722 /*
5723  * Decode GET_LEASE_TIME response
5724  */
5725 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp, uint32_t *p,
5726                                        struct nfs4_get_lease_time_res *res)
5727 {
5728         struct xdr_stream xdr;
5729         struct compound_hdr hdr;
5730         int status;
5731
5732         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5733         status = decode_compound_hdr(&xdr, &hdr);
5734         if (!status)
5735                 status = decode_sequence(&xdr, &res->lr_seq_res, rqstp);
5736         if (!status)
5737                 status = decode_putrootfh(&xdr);
5738         if (!status)
5739                 status = decode_fsinfo(&xdr, res->lr_fsinfo);
5740         return status;
5741 }
5742
5743 /*
5744  * Decode RECLAIM_COMPLETE response
5745  */
5746 static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp, uint32_t *p,
5747                                          struct nfs41_reclaim_complete_res *res)
5748 {
5749         struct xdr_stream xdr;
5750         struct compound_hdr hdr;
5751         int status;
5752
5753         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5754         status = decode_compound_hdr(&xdr, &hdr);
5755         if (!status)
5756                 status = decode_sequence(&xdr, &res->seq_res, rqstp);
5757         if (!status)
5758                 status = decode_reclaim_complete(&xdr, (void *)NULL);
5759         return status;
5760 }
5761 #endif /* CONFIG_NFS_V4_1 */
5762
5763 __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
5764 {
5765         uint32_t bitmap[2] = {0};
5766         uint32_t len;
5767
5768         if (!*p++) {
5769                 if (!*p)
5770                         return ERR_PTR(-EAGAIN);
5771                 entry->eof = 1;
5772                 return ERR_PTR(-EBADCOOKIE);
5773         }
5774
5775         entry->prev_cookie = entry->cookie;
5776         p = xdr_decode_hyper(p, &entry->cookie);
5777         entry->len = ntohl(*p++);
5778         entry->name = (const char *) p;
5779         p += XDR_QUADLEN(entry->len);
5780
5781         /*
5782          * In case the server doesn't return an inode number,
5783          * we fake one here.  (We don't use inode number 0,
5784          * since glibc seems to choke on it...)
5785          */
5786         entry->ino = 1;
5787
5788         len = ntohl(*p++);              /* bitmap length */
5789         if (len-- > 0) {
5790                 bitmap[0] = ntohl(*p++);
5791                 if (len-- > 0) {
5792                         bitmap[1] = ntohl(*p++);
5793                         p += len;
5794                 }
5795         }
5796         len = XDR_QUADLEN(ntohl(*p++)); /* attribute buffer length */
5797         if (len > 0) {
5798                 if (bitmap[0] & FATTR4_WORD0_RDATTR_ERROR) {
5799                         bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
5800                         /* Ignore the return value of rdattr_error for now */
5801                         p++;
5802                         len--;
5803                 }
5804                 if (bitmap[0] == 0 && bitmap[1] == FATTR4_WORD1_MOUNTED_ON_FILEID)
5805                         xdr_decode_hyper(p, &entry->ino);
5806                 else if (bitmap[0] == FATTR4_WORD0_FILEID)
5807                         xdr_decode_hyper(p, &entry->ino);
5808                 p += len;
5809         }
5810
5811         entry->eof = !p[0] && p[1];
5812         return p;
5813 }
5814
5815 /*
5816  * We need to translate between nfs status return values and
5817  * the local errno values which may not be the same.
5818  */
5819 static struct {
5820         int stat;
5821         int errno;
5822 } nfs_errtbl[] = {
5823         { NFS4_OK,              0               },
5824         { NFS4ERR_PERM,         -EPERM          },
5825         { NFS4ERR_NOENT,        -ENOENT         },
5826         { NFS4ERR_IO,           -errno_NFSERR_IO},
5827         { NFS4ERR_NXIO,         -ENXIO          },
5828         { NFS4ERR_ACCESS,       -EACCES         },
5829         { NFS4ERR_EXIST,        -EEXIST         },
5830         { NFS4ERR_XDEV,         -EXDEV          },
5831         { NFS4ERR_NOTDIR,       -ENOTDIR        },
5832         { NFS4ERR_ISDIR,        -EISDIR         },
5833         { NFS4ERR_INVAL,        -EINVAL         },
5834         { NFS4ERR_FBIG,         -EFBIG          },
5835         { NFS4ERR_NOSPC,        -ENOSPC         },
5836         { NFS4ERR_ROFS,         -EROFS          },
5837         { NFS4ERR_MLINK,        -EMLINK         },
5838         { NFS4ERR_NAMETOOLONG,  -ENAMETOOLONG   },
5839         { NFS4ERR_NOTEMPTY,     -ENOTEMPTY      },
5840         { NFS4ERR_DQUOT,        -EDQUOT         },
5841         { NFS4ERR_STALE,        -ESTALE         },
5842         { NFS4ERR_BADHANDLE,    -EBADHANDLE     },
5843         { NFS4ERR_BADOWNER,     -EINVAL         },
5844         { NFS4ERR_BADNAME,      -EINVAL         },
5845         { NFS4ERR_BAD_COOKIE,   -EBADCOOKIE     },
5846         { NFS4ERR_NOTSUPP,      -ENOTSUPP       },
5847         { NFS4ERR_TOOSMALL,     -ETOOSMALL      },
5848         { NFS4ERR_SERVERFAULT,  -EREMOTEIO      },
5849         { NFS4ERR_BADTYPE,      -EBADTYPE       },
5850         { NFS4ERR_LOCKED,       -EAGAIN         },
5851         { NFS4ERR_SYMLINK,      -ELOOP          },
5852         { NFS4ERR_OP_ILLEGAL,   -EOPNOTSUPP     },
5853         { NFS4ERR_DEADLOCK,     -EDEADLK        },
5854         { NFS4ERR_WRONGSEC,     -EPERM          }, /* FIXME: this needs
5855                                                     * to be handled by a
5856                                                     * middle-layer.
5857                                                     */
5858         { -1,                   -EIO            }
5859 };
5860
5861 /*
5862  * Convert an NFS error code to a local one.
5863  * This one is used jointly by NFSv2 and NFSv3.
5864  */
5865 static int
5866 nfs4_stat_to_errno(int stat)
5867 {
5868         int i;
5869         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
5870                 if (nfs_errtbl[i].stat == stat)
5871                         return nfs_errtbl[i].errno;
5872         }
5873         if (stat <= 10000 || stat > 10100) {
5874                 /* The server is looney tunes. */
5875                 return -EREMOTEIO;
5876         }
5877         /* If we cannot translate the error, the recovery routines should
5878          * handle it.
5879          * Note: remaining NFSv4 error codes have values > 10000, so should
5880          * not conflict with native Linux error codes.
5881          */
5882         return -stat;
5883 }
5884
5885 #define PROC(proc, argtype, restype)                            \
5886 [NFSPROC4_CLNT_##proc] = {                                      \
5887         .p_proc   = NFSPROC4_COMPOUND,                          \
5888         .p_encode = (kxdrproc_t) nfs4_xdr_##argtype,            \
5889         .p_decode = (kxdrproc_t) nfs4_xdr_##restype,            \
5890         .p_arglen = NFS4_##argtype##_sz,                        \
5891         .p_replen = NFS4_##restype##_sz,                        \
5892         .p_statidx = NFSPROC4_CLNT_##proc,                      \
5893         .p_name   = #proc,                                      \
5894 }
5895
5896 struct rpc_procinfo     nfs4_procedures[] = {
5897   PROC(READ,            enc_read,       dec_read),
5898   PROC(WRITE,           enc_write,      dec_write),
5899   PROC(COMMIT,          enc_commit,     dec_commit),
5900   PROC(OPEN,            enc_open,       dec_open),
5901   PROC(OPEN_CONFIRM,    enc_open_confirm,       dec_open_confirm),
5902   PROC(OPEN_NOATTR,     enc_open_noattr,        dec_open_noattr),
5903   PROC(OPEN_DOWNGRADE,  enc_open_downgrade,     dec_open_downgrade),
5904   PROC(CLOSE,           enc_close,      dec_close),
5905   PROC(SETATTR,         enc_setattr,    dec_setattr),
5906   PROC(FSINFO,          enc_fsinfo,     dec_fsinfo),
5907   PROC(RENEW,           enc_renew,      dec_renew),
5908   PROC(SETCLIENTID,     enc_setclientid,        dec_setclientid),
5909   PROC(SETCLIENTID_CONFIRM,     enc_setclientid_confirm,        dec_setclientid_confirm),
5910   PROC(LOCK,            enc_lock,       dec_lock),
5911   PROC(LOCKT,           enc_lockt,      dec_lockt),
5912   PROC(LOCKU,           enc_locku,      dec_locku),
5913   PROC(ACCESS,          enc_access,     dec_access),
5914   PROC(GETATTR,         enc_getattr,    dec_getattr),
5915   PROC(LOOKUP,          enc_lookup,     dec_lookup),
5916   PROC(LOOKUP_ROOT,     enc_lookup_root,        dec_lookup_root),
5917   PROC(REMOVE,          enc_remove,     dec_remove),
5918   PROC(RENAME,          enc_rename,     dec_rename),
5919   PROC(LINK,            enc_link,       dec_link),
5920   PROC(SYMLINK,         enc_symlink,    dec_symlink),
5921   PROC(CREATE,          enc_create,     dec_create),
5922   PROC(PATHCONF,        enc_pathconf,   dec_pathconf),
5923   PROC(STATFS,          enc_statfs,     dec_statfs),
5924   PROC(READLINK,        enc_readlink,   dec_readlink),
5925   PROC(READDIR,         enc_readdir,    dec_readdir),
5926   PROC(SERVER_CAPS,     enc_server_caps, dec_server_caps),
5927   PROC(DELEGRETURN,     enc_delegreturn, dec_delegreturn),
5928   PROC(GETACL,          enc_getacl,     dec_getacl),
5929   PROC(SETACL,          enc_setacl,     dec_setacl),
5930   PROC(FS_LOCATIONS,    enc_fs_locations, dec_fs_locations),
5931   PROC(RELEASE_LOCKOWNER, enc_release_lockowner, dec_release_lockowner),
5932 #if defined(CONFIG_NFS_V4_1)
5933   PROC(EXCHANGE_ID,     enc_exchange_id,        dec_exchange_id),
5934   PROC(CREATE_SESSION,  enc_create_session,     dec_create_session),
5935   PROC(DESTROY_SESSION, enc_destroy_session,    dec_destroy_session),
5936   PROC(SEQUENCE,        enc_sequence,   dec_sequence),
5937   PROC(GET_LEASE_TIME,  enc_get_lease_time,     dec_get_lease_time),
5938   PROC(RECLAIM_COMPLETE, enc_reclaim_complete,  dec_reclaim_complete),
5939 #endif /* CONFIG_NFS_V4_1 */
5940 };
5941
5942 struct rpc_version              nfs_version4 = {
5943         .number                 = 4,
5944         .nrprocs                = ARRAY_SIZE(nfs4_procedures),
5945         .procs                  = nfs4_procedures
5946 };
5947
5948 /*
5949  * Local variables:
5950  *  c-basic-offset: 8
5951  * End:
5952  */