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 <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  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/sunrpc/gss_api.h>
  50 #include <linux/nfs.h>
  51 #include <linux/nfs4.h>
  52 #include <linux/nfs_fs.h>
  53 #include <linux/nfs_idmap.h>
  54 #include "nfs4_fs.h"
  55 #include "internal.h"
  56 #include "pnfs.h"
  57
  58 #define NFSDBG_FACILITY         NFSDBG_XDR
  59
  60 /* Mapping from NFS error code to "errno" error code. */
  61 #define errno_NFSERR_IO         EIO
  62
  63 static int nfs4_stat_to_errno(int);
  64
  65 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
  66 #ifdef DEBUG
  67 #define NFS4_MAXTAGLEN          20
  68 #else
  69 #define NFS4_MAXTAGLEN          0
  70 #endif
  71
  72 /* lock,open owner id:
  73  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
  74  */
  75 #define open_owner_id_maxsz     (1 + 1 + 4)
  76 #define lock_owner_id_maxsz     (1 + 1 + 4)
  77 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
  78 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
  79 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
  80 #define op_encode_hdr_maxsz     (1)
  81 #define op_decode_hdr_maxsz     (2)
  82 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
  83 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
  84 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  85 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  86 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
  87                                 (NFS4_FHSIZE >> 2))
  88 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
  89 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
  90 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
  91 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
  92 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
  93                                 ((3+NFS4_FHSIZE) >> 2))
  94 #define nfs4_fattr_bitmap_maxsz 3
  95 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
  96 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
  97 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
  98 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
  99 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 100 /* This is based on getfattr, which uses the most attributes: */
 101 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
 102                                 3 + 3 + 3 + nfs4_owner_maxsz + nfs4_group_maxsz))
 103 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
 104                                 nfs4_fattr_value_maxsz)
 105 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
 106 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
 107                                  1 + 2 + 1 + \
 108                                 nfs4_owner_maxsz + \
 109                                 nfs4_group_maxsz + \
 110                                 4 + 4)
 111 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
 112 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
 113 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
 114 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
 115 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
 116 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + 15)
 117 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
 118 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
 119 #define encode_setclientid_maxsz \
 120                                 (op_encode_hdr_maxsz + \
 121                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
 122                                 XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
 123                                 1 /* sc_prog */ + \
 124                                 XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
 125                                 XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
 126                                 1) /* sc_cb_ident */
 127 #define decode_setclientid_maxsz \
 128                                 (op_decode_hdr_maxsz + \
 129                                 2 + \
 130                                 1024) /* large value for CLID_INUSE */
 131 #define encode_setclientid_confirm_maxsz \
 132                                 (op_encode_hdr_maxsz + \
 133                                 3 + (NFS4_VERIFIER_SIZE >> 2))
 134 #define decode_setclientid_confirm_maxsz \
 135                                 (op_decode_hdr_maxsz)
 136 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
 137 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
 138 #define encode_share_access_maxsz \
 139                                 (2)
 140 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
 141 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
 142 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
 143 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
 144                                 2 + encode_share_access_maxsz + 2 + \
 145                                 open_owner_id_maxsz + \
 146                                 encode_opentype_maxsz + \
 147                                 encode_claim_null_maxsz)
 148 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
 149 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
 150                                 decode_ace_maxsz)
 151 #define decode_change_info_maxsz        (5)
 152 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
 153                                 decode_stateid_maxsz + \
 154                                 decode_change_info_maxsz + 1 + \
 155                                 nfs4_fattr_bitmap_maxsz + \
 156                                 decode_delegation_maxsz)
 157 #define encode_open_confirm_maxsz \
 158                                 (op_encode_hdr_maxsz + \
 159                                  encode_stateid_maxsz + 1)
 160 #define decode_open_confirm_maxsz \
 161                                 (op_decode_hdr_maxsz + \
 162                                  decode_stateid_maxsz)
 163 #define encode_open_downgrade_maxsz \
 164                                 (op_encode_hdr_maxsz + \
 165                                  encode_stateid_maxsz + 1 + \
 166                                  encode_share_access_maxsz)
 167 #define decode_open_downgrade_maxsz \
 168                                 (op_decode_hdr_maxsz + \
 169                                  decode_stateid_maxsz)
 170 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
 171                                  1 + encode_stateid_maxsz)
 172 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
 173                                  decode_stateid_maxsz)
 174 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
 175                                  encode_stateid_maxsz + \
 176                                  encode_attrs_maxsz)
 177 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
 178                                  nfs4_fattr_bitmap_maxsz)
 179 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
 180                                  encode_stateid_maxsz + 3)
 181 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
 182 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
 183                                  2 + encode_verifier_maxsz + 5)
 184 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
 185                                  decode_verifier_maxsz)
 186 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
 187 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
 188 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
 189                                  encode_stateid_maxsz + 4)
 190 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
 191                                  2 + decode_verifier_maxsz)
 192 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
 193 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
 194                                  decode_verifier_maxsz)
 195 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
 196                                 nfs4_name_maxsz)
 197 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
 198                                  decode_change_info_maxsz)
 199 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
 200                                 2 * nfs4_name_maxsz)
 201 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
 202                                  decode_change_info_maxsz + \
 203                                  decode_change_info_maxsz)
 204 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
 205                                 nfs4_name_maxsz)
 206 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
 207 #define encode_lockowner_maxsz  (7)
 208 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
 209                                  7 + \
 210                                  1 + encode_stateid_maxsz + 1 + \
 211                                  encode_lockowner_maxsz)
 212 #define decode_lock_denied_maxsz \
 213                                 (8 + decode_lockowner_maxsz)
 214 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
 215                                  decode_lock_denied_maxsz)
 216 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
 217                                 encode_lockowner_maxsz)
 218 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
 219                                  decode_lock_denied_maxsz)
 220 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
 221                                  encode_stateid_maxsz + \
 222                                  4)
 223 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
 224                                  decode_stateid_maxsz)
 225 #define encode_release_lockowner_maxsz \
 226                                 (op_encode_hdr_maxsz + \
 227                                  encode_lockowner_maxsz)
 228 #define decode_release_lockowner_maxsz \
 229                                 (op_decode_hdr_maxsz)
 230 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
 231 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
 232 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
 233                                 1 + nfs4_name_maxsz + \
 234                                 1 + \
 235                                 nfs4_fattr_maxsz)
 236 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
 237 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
 238                                 1 + 2 + nfs4_name_maxsz + \
 239                                 encode_attrs_maxsz)
 240 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
 241                                 decode_change_info_maxsz + \
 242                                 nfs4_fattr_bitmap_maxsz)
 243 #define encode_statfs_maxsz     (encode_getattr_maxsz)
 244 #define decode_statfs_maxsz     (decode_getattr_maxsz)
 245 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
 246 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
 247 #define encode_getacl_maxsz     (encode_getattr_maxsz)
 248 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
 249                                  nfs4_fattr_bitmap_maxsz + 1)
 250 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
 251                                  encode_stateid_maxsz + 3)
 252 #define decode_setacl_maxsz     (decode_setattr_maxsz)
 253 #define encode_fs_locations_maxsz \
 254                                 (encode_getattr_maxsz)
 255 #define decode_fs_locations_maxsz \
 256                                 (0)
 257 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
 258 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
 259
 260 #if defined(CONFIG_NFS_V4_1)
 261 #define NFS4_MAX_MACHINE_NAME_LEN (64)
 262
 263 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
 264                                 encode_verifier_maxsz + \
 265                                 1 /* co_ownerid.len */ + \
 266                                 XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
 267                                 1 /* flags */ + \
 268                                 1 /* spa_how */ + \
 269                                 0 /* SP4_NONE (for now) */ + \
 270                                 1 /* zero implemetation id array */)
 271 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
 272                                 2 /* eir_clientid */ + \
 273                                 1 /* eir_sequenceid */ + \
 274                                 1 /* eir_flags */ + \
 275                                 1 /* spr_how */ + \
 276                                 0 /* SP4_NONE (for now) */ + \
 277                                 2 /* eir_server_owner.so_minor_id */ + \
 278                                 /* eir_server_owner.so_major_id<> */ \
 279                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 280                                 /* eir_server_scope<> */ \
 281                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 282                                 1 /* eir_server_impl_id array length */ + \
 283                                 0 /* ignored eir_server_impl_id contents */)
 284 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
 285 #define decode_channel_attrs_maxsz  (6 + \
 286                                      1 /* ca_rdma_ird.len */ + \
 287                                      1 /* ca_rdma_ird */)
 288 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
 289                                      2 /* csa_clientid */ + \
 290                                      1 /* csa_sequence */ + \
 291                                      1 /* csa_flags */ + \
 292                                      encode_channel_attrs_maxsz + \
 293                                      encode_channel_attrs_maxsz + \
 294                                      1 /* csa_cb_program */ + \
 295                                      1 /* csa_sec_parms.len (1) */ + \
 296                                      1 /* cb_secflavor (AUTH_SYS) */ + \
 297                                      1 /* stamp */ + \
 298                                      1 /* machinename.len */ + \
 299                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
 300                                      1 /* uid */ + \
 301                                      1 /* gid */ + \
 302                                      1 /* gids.len (0) */)
 303 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
 304                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
 305                                      1 /* csr_sequence */ + \
 306                                      1 /* csr_flags */ + \
 307                                      decode_channel_attrs_maxsz + \
 308                                      decode_channel_attrs_maxsz)
 309 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
 310 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
 311 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
 312                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
 313 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
 314                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
 315 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
 316 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
 317 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + 4 + \
 318                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE))
 319 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
 320                                 1 /* layout type */ + \
 321                                 1 /* opaque devaddr4 length */ + \
 322                                   /* devaddr4 payload is read into page */ \
 323                                 1 /* notification bitmap length */ + \
 324                                 1 /* notification bitmap */)
 325 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
 326                                 encode_stateid_maxsz)
 327 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
 328                                 decode_stateid_maxsz + \
 329                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
 330 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
 331                                 2 /* offset */ + \
 332                                 2 /* length */ + \
 333                                 1 /* reclaim */ + \
 334                                 encode_stateid_maxsz + \
 335                                 1 /* new offset (true) */ + \
 336                                 2 /* last byte written */ + \
 337                                 1 /* nt_timechanged (false) */ + \
 338                                 1 /* layoutupdate4 layout type */ + \
 339                                 1 /* NULL filelayout layoutupdate4 payload */)
 340 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
 341 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
 342                                 encode_stateid_maxsz + \
 343                                 1 /* FIXME: opaque lrf_body always empty at the moment */)
 344 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
 345                                 1 + decode_stateid_maxsz)
 346 #else /* CONFIG_NFS_V4_1 */
 347 #define encode_sequence_maxsz   0
 348 #define decode_sequence_maxsz   0
 349 #endif /* CONFIG_NFS_V4_1 */
 350
 351 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
 352 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
 353 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
 354                                 encode_sequence_maxsz + \
 355                                 encode_putfh_maxsz + \
 356                                 encode_read_maxsz)
 357 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
 358                                 decode_sequence_maxsz + \
 359                                 decode_putfh_maxsz + \
 360                                 decode_read_maxsz)
 361 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
 362                                 encode_sequence_maxsz + \
 363                                 encode_putfh_maxsz + \
 364                                 encode_readlink_maxsz)
 365 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
 366                                 decode_sequence_maxsz + \
 367                                 decode_putfh_maxsz + \
 368                                 decode_readlink_maxsz)
 369 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
 370                                 encode_sequence_maxsz + \
 371                                 encode_putfh_maxsz + \
 372                                 encode_readdir_maxsz)
 373 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
 374                                 decode_sequence_maxsz + \
 375                                 decode_putfh_maxsz + \
 376                                 decode_readdir_maxsz)
 377 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
 378                                 encode_sequence_maxsz + \
 379                                 encode_putfh_maxsz + \
 380                                 encode_write_maxsz + \
 381                                 encode_getattr_maxsz)
 382 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
 383                                 decode_sequence_maxsz + \
 384                                 decode_putfh_maxsz + \
 385                                 decode_write_maxsz + \
 386                                 decode_getattr_maxsz)
 387 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
 388                                 encode_sequence_maxsz + \
 389                                 encode_putfh_maxsz + \
 390                                 encode_commit_maxsz + \
 391                                 encode_getattr_maxsz)
 392 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
 393                                 decode_sequence_maxsz + \
 394                                 decode_putfh_maxsz + \
 395                                 decode_commit_maxsz + \
 396                                 decode_getattr_maxsz)
 397 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
 398                                 encode_sequence_maxsz + \
 399                                 encode_putfh_maxsz + \
 400                                 encode_savefh_maxsz + \
 401                                 encode_open_maxsz + \
 402                                 encode_getfh_maxsz + \
 403                                 encode_getattr_maxsz + \
 404                                 encode_restorefh_maxsz + \
 405                                 encode_getattr_maxsz)
 406 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
 407                                 decode_sequence_maxsz + \
 408                                 decode_putfh_maxsz + \
 409                                 decode_savefh_maxsz + \
 410                                 decode_open_maxsz + \
 411                                 decode_getfh_maxsz + \
 412                                 decode_getattr_maxsz + \
 413                                 decode_restorefh_maxsz + \
 414                                 decode_getattr_maxsz)
 415 #define NFS4_enc_open_confirm_sz \
 416                                 (compound_encode_hdr_maxsz + \
 417                                  encode_putfh_maxsz + \
 418                                  encode_open_confirm_maxsz)
 419 #define NFS4_dec_open_confirm_sz \
 420                                 (compound_decode_hdr_maxsz + \
 421                                  decode_putfh_maxsz + \
 422                                  decode_open_confirm_maxsz)
 423 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
 424                                         encode_sequence_maxsz + \
 425                                         encode_putfh_maxsz + \
 426                                         encode_open_maxsz + \
 427                                         encode_getattr_maxsz)
 428 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
 429                                         decode_sequence_maxsz + \
 430                                         decode_putfh_maxsz + \
 431                                         decode_open_maxsz + \
 432                                         decode_getattr_maxsz)
 433 #define NFS4_enc_open_downgrade_sz \
 434                                 (compound_encode_hdr_maxsz + \
 435                                  encode_sequence_maxsz + \
 436                                  encode_putfh_maxsz + \
 437                                  encode_open_downgrade_maxsz + \
 438                                  encode_getattr_maxsz)
 439 #define NFS4_dec_open_downgrade_sz \
 440                                 (compound_decode_hdr_maxsz + \
 441                                  decode_sequence_maxsz + \
 442                                  decode_putfh_maxsz + \
 443                                  decode_open_downgrade_maxsz + \
 444                                  decode_getattr_maxsz)
 445 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
 446                                  encode_sequence_maxsz + \
 447                                  encode_putfh_maxsz + \
 448                                  encode_close_maxsz + \
 449                                  encode_getattr_maxsz)
 450 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
 451                                  decode_sequence_maxsz + \
 452                                  decode_putfh_maxsz + \
 453                                  decode_close_maxsz + \
 454                                  decode_getattr_maxsz)
 455 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
 456                                  encode_sequence_maxsz + \
 457                                  encode_putfh_maxsz + \
 458                                  encode_setattr_maxsz + \
 459                                  encode_getattr_maxsz)
 460 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
 461                                  decode_sequence_maxsz + \
 462                                  decode_putfh_maxsz + \
 463                                  decode_setattr_maxsz + \
 464                                  decode_getattr_maxsz)
 465 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
 466                                 encode_sequence_maxsz + \
 467                                 encode_putfh_maxsz + \
 468                                 encode_fsinfo_maxsz)
 469 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
 470                                 decode_sequence_maxsz + \
 471                                 decode_putfh_maxsz + \
 472                                 decode_fsinfo_maxsz)
 473 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
 474                                 encode_renew_maxsz)
 475 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
 476                                 decode_renew_maxsz)
 477 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
 478                                 encode_setclientid_maxsz)
 479 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
 480                                 decode_setclientid_maxsz)
 481 #define NFS4_enc_setclientid_confirm_sz \
 482                                 (compound_encode_hdr_maxsz + \
 483                                 encode_setclientid_confirm_maxsz + \
 484                                 encode_putrootfh_maxsz + \
 485                                 encode_fsinfo_maxsz)
 486 #define NFS4_dec_setclientid_confirm_sz \
 487                                 (compound_decode_hdr_maxsz + \
 488                                 decode_setclientid_confirm_maxsz + \
 489                                 decode_putrootfh_maxsz + \
 490                                 decode_fsinfo_maxsz)
 491 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
 492                                 encode_sequence_maxsz + \
 493                                 encode_putfh_maxsz + \
 494                                 encode_lock_maxsz)
 495 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
 496                                 decode_sequence_maxsz + \
 497                                 decode_putfh_maxsz + \
 498                                 decode_lock_maxsz)
 499 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
 500                                 encode_sequence_maxsz + \
 501                                 encode_putfh_maxsz + \
 502                                 encode_lockt_maxsz)
 503 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
 504                                  decode_sequence_maxsz + \
 505                                  decode_putfh_maxsz + \
 506                                  decode_lockt_maxsz)
 507 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
 508                                 encode_sequence_maxsz + \
 509                                 encode_putfh_maxsz + \
 510                                 encode_locku_maxsz)
 511 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
 512                                 decode_sequence_maxsz + \
 513                                 decode_putfh_maxsz + \
 514                                 decode_locku_maxsz)
 515 #define NFS4_enc_release_lockowner_sz \
 516                                 (compound_encode_hdr_maxsz + \
 517                                  encode_lockowner_maxsz)
 518 #define NFS4_dec_release_lockowner_sz \
 519                                 (compound_decode_hdr_maxsz + \
 520                                  decode_lockowner_maxsz)
 521 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
 522                                 encode_sequence_maxsz + \
 523                                 encode_putfh_maxsz + \
 524                                 encode_access_maxsz + \
 525                                 encode_getattr_maxsz)
 526 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
 527                                 decode_sequence_maxsz + \
 528                                 decode_putfh_maxsz + \
 529                                 decode_access_maxsz + \
 530                                 decode_getattr_maxsz)
 531 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
 532                                 encode_sequence_maxsz + \
 533                                 encode_putfh_maxsz + \
 534                                 encode_getattr_maxsz)
 535 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
 536                                 decode_sequence_maxsz + \
 537                                 decode_putfh_maxsz + \
 538                                 decode_getattr_maxsz)
 539 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
 540                                 encode_sequence_maxsz + \
 541                                 encode_putfh_maxsz + \
 542                                 encode_lookup_maxsz + \
 543                                 encode_getattr_maxsz + \
 544                                 encode_getfh_maxsz)
 545 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
 546                                 decode_sequence_maxsz + \
 547                                 decode_putfh_maxsz + \
 548                                 decode_lookup_maxsz + \
 549                                 decode_getattr_maxsz + \
 550                                 decode_getfh_maxsz)
 551 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
 552                                 encode_sequence_maxsz + \
 553                                 encode_putrootfh_maxsz + \
 554                                 encode_getattr_maxsz + \
 555                                 encode_getfh_maxsz)
 556 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
 557                                 decode_sequence_maxsz + \
 558                                 decode_putrootfh_maxsz + \
 559                                 decode_getattr_maxsz + \
 560                                 decode_getfh_maxsz)
 561 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
 562                                 encode_sequence_maxsz + \
 563                                 encode_putfh_maxsz + \
 564                                 encode_remove_maxsz + \
 565                                 encode_getattr_maxsz)
 566 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
 567                                 decode_sequence_maxsz + \
 568                                 decode_putfh_maxsz + \
 569                                 decode_remove_maxsz + \
 570                                 decode_getattr_maxsz)
 571 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
 572                                 encode_sequence_maxsz + \
 573                                 encode_putfh_maxsz + \
 574                                 encode_savefh_maxsz + \
 575                                 encode_putfh_maxsz + \
 576                                 encode_rename_maxsz + \
 577                                 encode_getattr_maxsz + \
 578                                 encode_restorefh_maxsz + \
 579                                 encode_getattr_maxsz)
 580 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
 581                                 decode_sequence_maxsz + \
 582                                 decode_putfh_maxsz + \
 583                                 decode_savefh_maxsz + \
 584                                 decode_putfh_maxsz + \
 585                                 decode_rename_maxsz + \
 586                                 decode_getattr_maxsz + \
 587                                 decode_restorefh_maxsz + \
 588                                 decode_getattr_maxsz)
 589 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
 590                                 encode_sequence_maxsz + \
 591                                 encode_putfh_maxsz + \
 592                                 encode_savefh_maxsz + \
 593                                 encode_putfh_maxsz + \
 594                                 encode_link_maxsz + \
 595                                 decode_getattr_maxsz + \
 596                                 encode_restorefh_maxsz + \
 597                                 decode_getattr_maxsz)
 598 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
 599                                 decode_sequence_maxsz + \
 600                                 decode_putfh_maxsz + \
 601                                 decode_savefh_maxsz + \
 602                                 decode_putfh_maxsz + \
 603                                 decode_link_maxsz + \
 604                                 decode_getattr_maxsz + \
 605                                 decode_restorefh_maxsz + \
 606                                 decode_getattr_maxsz)
 607 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
 608                                 encode_sequence_maxsz + \
 609                                 encode_putfh_maxsz + \
 610                                 encode_symlink_maxsz + \
 611                                 encode_getattr_maxsz + \
 612                                 encode_getfh_maxsz)
 613 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
 614                                 decode_sequence_maxsz + \
 615                                 decode_putfh_maxsz + \
 616                                 decode_symlink_maxsz + \
 617                                 decode_getattr_maxsz + \
 618                                 decode_getfh_maxsz)
 619 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
 620                                 encode_sequence_maxsz + \
 621                                 encode_putfh_maxsz + \
 622                                 encode_savefh_maxsz + \
 623                                 encode_create_maxsz + \
 624                                 encode_getfh_maxsz + \
 625                                 encode_getattr_maxsz + \
 626                                 encode_restorefh_maxsz + \
 627                                 encode_getattr_maxsz)
 628 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
 629                                 decode_sequence_maxsz + \
 630                                 decode_putfh_maxsz + \
 631                                 decode_savefh_maxsz + \
 632                                 decode_create_maxsz + \
 633                                 decode_getfh_maxsz + \
 634                                 decode_getattr_maxsz + \
 635                                 decode_restorefh_maxsz + \
 636                                 decode_getattr_maxsz)
 637 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
 638                                 encode_sequence_maxsz + \
 639                                 encode_putfh_maxsz + \
 640                                 encode_getattr_maxsz)
 641 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
 642                                 decode_sequence_maxsz + \
 643                                 decode_putfh_maxsz + \
 644                                 decode_getattr_maxsz)
 645 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
 646                                 encode_sequence_maxsz + \
 647                                 encode_putfh_maxsz + \
 648                                 encode_statfs_maxsz)
 649 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
 650                                 decode_sequence_maxsz + \
 651                                 decode_putfh_maxsz + \
 652                                 decode_statfs_maxsz)
 653 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
 654                                 encode_sequence_maxsz + \
 655                                 encode_putfh_maxsz + \
 656                                 encode_getattr_maxsz)
 657 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
 658                                 decode_sequence_maxsz + \
 659                                 decode_putfh_maxsz + \
 660                                 decode_getattr_maxsz)
 661 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
 662                                 encode_sequence_maxsz + \
 663                                 encode_putfh_maxsz + \
 664                                 encode_delegreturn_maxsz + \
 665                                 encode_getattr_maxsz)
 666 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
 667                                 decode_sequence_maxsz + \
 668                                 decode_delegreturn_maxsz + \
 669                                 decode_getattr_maxsz)
 670 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
 671                                 encode_sequence_maxsz + \
 672                                 encode_putfh_maxsz + \
 673                                 encode_getacl_maxsz)
 674 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
 675                                 decode_sequence_maxsz + \
 676                                 decode_putfh_maxsz + \
 677                                 decode_getacl_maxsz)
 678 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
 679                                 encode_sequence_maxsz + \
 680                                 encode_putfh_maxsz + \
 681                                 encode_setacl_maxsz)
 682 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
 683                                 decode_sequence_maxsz + \
 684                                 decode_putfh_maxsz + \
 685                                 decode_setacl_maxsz)
 686 #define NFS4_enc_fs_locations_sz \
 687                                 (compound_encode_hdr_maxsz + \
 688                                  encode_sequence_maxsz + \
 689                                  encode_putfh_maxsz + \
 690                                  encode_lookup_maxsz + \
 691                                  encode_fs_locations_maxsz)
 692 #define NFS4_dec_fs_locations_sz \
 693                                 (compound_decode_hdr_maxsz + \
 694                                  decode_sequence_maxsz + \
 695                                  decode_putfh_maxsz + \
 696                                  decode_lookup_maxsz + \
 697                                  decode_fs_locations_maxsz)
 698 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
 699                                 encode_sequence_maxsz + \
 700                                 encode_putfh_maxsz + \
 701                                 encode_secinfo_maxsz)
 702 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
 703                                 decode_sequence_maxsz + \
 704                                 decode_putfh_maxsz + \
 705                                 decode_secinfo_maxsz)
 706 #if defined(CONFIG_NFS_V4_1)
 707 #define NFS4_enc_exchange_id_sz \
 708                                 (compound_encode_hdr_maxsz + \
 709                                  encode_exchange_id_maxsz)
 710 #define NFS4_dec_exchange_id_sz \
 711                                 (compound_decode_hdr_maxsz + \
 712                                  decode_exchange_id_maxsz)
 713 #define NFS4_enc_create_session_sz \
 714                                 (compound_encode_hdr_maxsz + \
 715                                  encode_create_session_maxsz)
 716 #define NFS4_dec_create_session_sz \
 717                                 (compound_decode_hdr_maxsz + \
 718                                  decode_create_session_maxsz)
 719 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
 720                                          encode_destroy_session_maxsz)
 721 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
 722                                          decode_destroy_session_maxsz)
 723 #define NFS4_enc_sequence_sz \
 724                                 (compound_decode_hdr_maxsz + \
 725                                  encode_sequence_maxsz)
 726 #define NFS4_dec_sequence_sz \
 727                                 (compound_decode_hdr_maxsz + \
 728                                  decode_sequence_maxsz)
 729 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
 730                                          encode_sequence_maxsz + \
 731                                          encode_putrootfh_maxsz + \
 732                                          encode_fsinfo_maxsz)
 733 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
 734                                          decode_sequence_maxsz + \
 735                                          decode_putrootfh_maxsz + \
 736                                          decode_fsinfo_maxsz)
 737 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
 738                                          encode_sequence_maxsz + \
 739                                          encode_reclaim_complete_maxsz)
 740 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
 741                                          decode_sequence_maxsz + \
 742                                          decode_reclaim_complete_maxsz)
 743 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
 744                                 encode_sequence_maxsz +\
 745                                 encode_getdeviceinfo_maxsz)
 746 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
 747                                 decode_sequence_maxsz + \
 748                                 decode_getdeviceinfo_maxsz)
 749 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
 750                                 encode_sequence_maxsz + \
 751                                 encode_putfh_maxsz +        \
 752                                 encode_layoutget_maxsz)
 753 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
 754                                 decode_sequence_maxsz + \
 755                                 decode_putfh_maxsz +        \
 756                                 decode_layoutget_maxsz)
 757 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
 758                                 encode_sequence_maxsz +\
 759                                 encode_putfh_maxsz + \
 760                                 encode_layoutcommit_maxsz + \
 761                                 encode_getattr_maxsz)
 762 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
 763                                 decode_sequence_maxsz + \
 764                                 decode_putfh_maxsz + \
 765                                 decode_layoutcommit_maxsz + \
 766                                 decode_getattr_maxsz)
 767 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
 768                                 encode_sequence_maxsz + \
 769                                 encode_putfh_maxsz + \
 770                                 encode_layoutreturn_maxsz)
 771 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
 772                                 decode_sequence_maxsz + \
 773                                 decode_putfh_maxsz + \
 774                                 decode_layoutreturn_maxsz)
 775
 776 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 777                                       compound_encode_hdr_maxsz +
 778                                       encode_sequence_maxsz +
 779                                       encode_putfh_maxsz +
 780                                       encode_getattr_maxsz) *
 781                                      XDR_UNIT);
 782
 783 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 784                                      compound_decode_hdr_maxsz +
 785                                      decode_sequence_maxsz +
 786                                      decode_putfh_maxsz) *
 787                                     XDR_UNIT);
 788 #endif /* CONFIG_NFS_V4_1 */
 789
 790 static const umode_t nfs_type2fmt[] = {
 791         [NF4BAD] = 0,
 792         [NF4REG] = S_IFREG,
 793         [NF4DIR] = S_IFDIR,
 794         [NF4BLK] = S_IFBLK,
 795         [NF4CHR] = S_IFCHR,
 796         [NF4LNK] = S_IFLNK,
 797         [NF4SOCK] = S_IFSOCK,
 798         [NF4FIFO] = S_IFIFO,
 799         [NF4ATTRDIR] = 0,
 800         [NF4NAMEDATTR] = 0,
 801 };
 802
 803 struct compound_hdr {
 804         int32_t         status;
 805         uint32_t        nops;
 806         __be32 *        nops_p;
 807         uint32_t        taglen;
 808         char *          tag;
 809         uint32_t        replen;         /* expected reply words */
 810         u32             minorversion;
 811 };
 812
 813 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
 814 {
 815         __be32 *p = xdr_reserve_space(xdr, nbytes);
 816         BUG_ON(!p);
 817         return p;
 818 }
 819
 820 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
 821 {
 822         __be32 *p;
 823
 824         p = xdr_reserve_space(xdr, 4 + len);
 825         BUG_ON(p == NULL);
 826         xdr_encode_opaque(p, str, len);
 827 }
 828
 829 static void encode_compound_hdr(struct xdr_stream *xdr,
 830                                 struct rpc_rqst *req,
 831                                 struct compound_hdr *hdr)
 832 {
 833         __be32 *p;
 834         struct rpc_auth *auth = req->rq_cred->cr_auth;
 835
 836         /* initialize running count of expected bytes in reply.
 837          * NOTE: the replied tag SHOULD be the same is the one sent,
 838          * but this is not required as a MUST for the server to do so. */
 839         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
 840
 841         dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
 842         BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
 843         p = reserve_space(xdr, 4 + hdr->taglen + 8);
 844         p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);
 845         *p++ = cpu_to_be32(hdr->minorversion);
 846         hdr->nops_p = p;
 847         *p = cpu_to_be32(hdr->nops);
 848 }
 849
 850 static void encode_nops(struct compound_hdr *hdr)
 851 {
 852         BUG_ON(hdr->nops > NFS4_MAX_OPS);
 853         *hdr->nops_p = htonl(hdr->nops);
 854 }
 855
 856 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
 857 {
 858         __be32 *p;
 859
 860         p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
 861         BUG_ON(p == NULL);
 862         xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
 863 }
 864
 865 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
 866 {
 867         char owner_name[IDMAP_NAMESZ];
 868         char owner_group[IDMAP_NAMESZ];
 869         int owner_namelen = 0;
 870         int owner_grouplen = 0;
 871         __be32 *p;
 872         __be32 *q;
 873         int len;
 874         uint32_t bmval0 = 0;
 875         uint32_t bmval1 = 0;
 876
 877         /*
 878          * We reserve enough space to write the entire attribute buffer at once.
 879          * In the worst-case, this would be
 880          *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
 881          *          = 36 bytes, plus any contribution from variable-length fields
 882          *            such as owner/group.
 883          */
 884         len = 16;
 885
 886         /* Sigh */
 887         if (iap->ia_valid & ATTR_SIZE)
 888                 len += 8;
 889         if (iap->ia_valid & ATTR_MODE)
 890                 len += 4;
 891         if (iap->ia_valid & ATTR_UID) {
 892                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
 893                 if (owner_namelen < 0) {
 894                         dprintk("nfs: couldn't resolve uid %d to string\n",
 895                                         iap->ia_uid);
 896                         /* XXX */
 897                         strcpy(owner_name, "nobody");
 898                         owner_namelen = sizeof("nobody") - 1;
 899                         /* goto out; */
 900                 }
 901                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
 902         }
 903         if (iap->ia_valid & ATTR_GID) {
 904                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
 905                 if (owner_grouplen < 0) {
 906                         dprintk("nfs: couldn't resolve gid %d to string\n",
 907                                         iap->ia_gid);
 908                         strcpy(owner_group, "nobody");
 909                         owner_grouplen = sizeof("nobody") - 1;
 910                         /* goto out; */
 911                 }
 912                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
 913         }
 914         if (iap->ia_valid & ATTR_ATIME_SET)
 915                 len += 16;
 916         else if (iap->ia_valid & ATTR_ATIME)
 917                 len += 4;
 918         if (iap->ia_valid & ATTR_MTIME_SET)
 919                 len += 16;
 920         else if (iap->ia_valid & ATTR_MTIME)
 921                 len += 4;
 922         p = reserve_space(xdr, len);
 923
 924         /*
 925          * We write the bitmap length now, but leave the bitmap and the attribute
 926          * buffer length to be backfilled at the end of this routine.
 927          */
 928         *p++ = cpu_to_be32(2);
 929         q = p;
 930         p += 3;
 931
 932         if (iap->ia_valid & ATTR_SIZE) {
 933                 bmval0 |= FATTR4_WORD0_SIZE;
 934                 p = xdr_encode_hyper(p, iap->ia_size);
 935         }
 936         if (iap->ia_valid & ATTR_MODE) {
 937                 bmval1 |= FATTR4_WORD1_MODE;
 938                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
 939         }
 940         if (iap->ia_valid & ATTR_UID) {
 941                 bmval1 |= FATTR4_WORD1_OWNER;
 942                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
 943         }
 944         if (iap->ia_valid & ATTR_GID) {
 945                 bmval1 |= FATTR4_WORD1_OWNER_GROUP;
 946                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
 947         }
 948         if (iap->ia_valid & ATTR_ATIME_SET) {
 949                 bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
 950                 *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
 951                 *p++ = cpu_to_be32(0);
 952                 *p++ = cpu_to_be32(iap->ia_atime.tv_sec);
 953                 *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
 954         }
 955         else if (iap->ia_valid & ATTR_ATIME) {
 956                 bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
 957                 *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
 958         }
 959         if (iap->ia_valid & ATTR_MTIME_SET) {
 960                 bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
 961                 *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
 962                 *p++ = cpu_to_be32(0);
 963                 *p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
 964                 *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
 965         }
 966         else if (iap->ia_valid & ATTR_MTIME) {
 967                 bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
 968                 *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
 969         }
 970
 971         /*
 972          * Now we backfill the bitmap and the attribute buffer length.
 973          */
 974         if (len != ((char *)p - (char *)q) + 4) {
 975                 printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
 976                                 len, ((char *)p - (char *)q) + 4);
 977                 BUG();
 978         }
 979         len = (char *)p - (char *)q - 12;
 980         *q++ = htonl(bmval0);
 981         *q++ = htonl(bmval1);
 982         *q = htonl(len);
 983
 984 /* out: */
 985 }
 986
 987 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
 988 {
 989         __be32 *p;
 990
 991         p = reserve_space(xdr, 8);
 992         *p++ = cpu_to_be32(OP_ACCESS);
 993         *p = cpu_to_be32(access);
 994         hdr->nops++;
 995         hdr->replen += decode_access_maxsz;
 996 }
 997
 998 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
 999 {
1000         __be32 *p;
1001
1002         p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
1003         *p++ = cpu_to_be32(OP_CLOSE);
1004         *p++ = cpu_to_be32(arg->seqid->sequence->counter);
1005         xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1006         hdr->nops++;
1007         hdr->replen += decode_close_maxsz;
1008 }
1009
1010 static void encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1011 {
1012         __be32 *p;
1013
1014         p = reserve_space(xdr, 16);
1015         *p++ = cpu_to_be32(OP_COMMIT);
1016         p = xdr_encode_hyper(p, args->offset);
1017         *p = cpu_to_be32(args->count);
1018         hdr->nops++;
1019         hdr->replen += decode_commit_maxsz;
1020 }
1021
1022 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1023 {
1024         __be32 *p;
1025
1026         p = reserve_space(xdr, 8);
1027         *p++ = cpu_to_be32(OP_CREATE);
1028         *p = cpu_to_be32(create->ftype);
1029
1030         switch (create->ftype) {
1031         case NF4LNK:
1032                 p = reserve_space(xdr, 4);
1033                 *p = cpu_to_be32(create->u.symlink.len);
1034                 xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
1035                 break;
1036
1037         case NF4BLK: case NF4CHR:
1038                 p = reserve_space(xdr, 8);
1039                 *p++ = cpu_to_be32(create->u.device.specdata1);
1040                 *p = cpu_to_be32(create->u.device.specdata2);
1041                 break;
1042
1043         default:
1044                 break;
1045         }
1046
1047         encode_string(xdr, create->name->len, create->name->name);
1048         hdr->nops++;
1049         hdr->replen += decode_create_maxsz;
1050
1051         encode_attrs(xdr, create->attrs, create->server);
1052 }
1053
1054 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
1055 {
1056         __be32 *p;
1057
1058         p = reserve_space(xdr, 12);
1059         *p++ = cpu_to_be32(OP_GETATTR);
1060         *p++ = cpu_to_be32(1);
1061         *p = cpu_to_be32(bitmap);
1062         hdr->nops++;
1063         hdr->replen += decode_getattr_maxsz;
1064 }
1065
1066 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
1067 {
1068         __be32 *p;
1069
1070         p = reserve_space(xdr, 16);
1071         *p++ = cpu_to_be32(OP_GETATTR);
1072         *p++ = cpu_to_be32(2);
1073         *p++ = cpu_to_be32(bm0);
1074         *p = cpu_to_be32(bm1);
1075         hdr->nops++;
1076         hdr->replen += decode_getattr_maxsz;
1077 }
1078
1079 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1080 {
1081         encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1082                            bitmask[1] & nfs4_fattr_bitmap[1], hdr);
1083 }
1084
1085 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1086 {
1087         encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],
1088                            bitmask[1] & nfs4_fsinfo_bitmap[1], hdr);
1089 }
1090
1091 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1092 {
1093         encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1094                            bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1095 }
1096
1097 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1098 {
1099         __be32 *p;
1100
1101         p = reserve_space(xdr, 4);
1102         *p = cpu_to_be32(OP_GETFH);
1103         hdr->nops++;
1104         hdr->replen += decode_getfh_maxsz;
1105 }
1106
1107 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1108 {
1109         __be32 *p;
1110
1111         p = reserve_space(xdr, 8 + name->len);
1112         *p++ = cpu_to_be32(OP_LINK);
1113         xdr_encode_opaque(p, name->name, name->len);
1114         hdr->nops++;
1115         hdr->replen += decode_link_maxsz;
1116 }
1117
1118 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1119 {
1120         if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
1121                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1122         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1123 }
1124
1125 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1126 {
1127         if (fl->fl_end == OFFSET_MAX)
1128                 return ~(uint64_t)0;
1129         return fl->fl_end - fl->fl_start + 1;
1130 }
1131
1132 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1133 {
1134         __be32 *p;
1135
1136         p = reserve_space(xdr, 32);
1137         p = xdr_encode_hyper(p, lowner->clientid);
1138         *p++ = cpu_to_be32(20);
1139         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1140         *p++ = cpu_to_be32(lowner->s_dev);
1141         xdr_encode_hyper(p, lowner->id);
1142 }
1143
1144 /*
1145  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1146  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1147  */
1148 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1149 {
1150         __be32 *p;
1151
1152         p = reserve_space(xdr, 32);
1153         *p++ = cpu_to_be32(OP_LOCK);
1154         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1155         *p++ = cpu_to_be32(args->reclaim);
1156         p = xdr_encode_hyper(p, args->fl->fl_start);
1157         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1158         *p = cpu_to_be32(args->new_lock_owner);
1159         if (args->new_lock_owner){
1160                 p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1161                 *p++ = cpu_to_be32(args->open_seqid->sequence->counter);
1162                 p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
1163                 *p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
1164                 encode_lockowner(xdr, &args->lock_owner);
1165         }
1166         else {
1167                 p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
1168                 p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
1169                 *p = cpu_to_be32(args->lock_seqid->sequence->counter);
1170         }
1171         hdr->nops++;
1172         hdr->replen += decode_lock_maxsz;
1173 }
1174
1175 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1176 {
1177         __be32 *p;
1178
1179         p = reserve_space(xdr, 24);
1180         *p++ = cpu_to_be32(OP_LOCKT);
1181         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1182         p = xdr_encode_hyper(p, args->fl->fl_start);
1183         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1184         encode_lockowner(xdr, &args->lock_owner);
1185         hdr->nops++;
1186         hdr->replen += decode_lockt_maxsz;
1187 }
1188
1189 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1190 {
1191         __be32 *p;
1192
1193         p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
1194         *p++ = cpu_to_be32(OP_LOCKU);
1195         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1196         *p++ = cpu_to_be32(args->seqid->sequence->counter);
1197         p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
1198         p = xdr_encode_hyper(p, args->fl->fl_start);
1199         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1200         hdr->nops++;
1201         hdr->replen += decode_locku_maxsz;
1202 }
1203
1204 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1205 {
1206         __be32 *p;
1207
1208         p = reserve_space(xdr, 4);
1209         *p = cpu_to_be32(OP_RELEASE_LOCKOWNER);
1210         encode_lockowner(xdr, lowner);
1211         hdr->nops++;
1212         hdr->replen += decode_release_lockowner_maxsz;
1213 }
1214
1215 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1216 {
1217         int len = name->len;
1218         __be32 *p;
1219
1220         p = reserve_space(xdr, 8 + len);
1221         *p++ = cpu_to_be32(OP_LOOKUP);
1222         xdr_encode_opaque(p, name->name, len);
1223         hdr->nops++;
1224         hdr->replen += decode_lookup_maxsz;
1225 }
1226
1227 static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
1228 {
1229         __be32 *p;
1230
1231         p = reserve_space(xdr, 8);
1232         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1233         case FMODE_READ:
1234                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
1235                 break;
1236         case FMODE_WRITE:
1237                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
1238                 break;
1239         case FMODE_READ|FMODE_WRITE:
1240                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
1241                 break;
1242         default:
1243                 *p++ = cpu_to_be32(0);
1244         }
1245         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1246 }
1247
1248 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1249 {
1250         __be32 *p;
1251  /*
1252  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1253  * owner 4 = 32
1254  */
1255         p = reserve_space(xdr, 8);
1256         *p++ = cpu_to_be32(OP_OPEN);
1257         *p = cpu_to_be32(arg->seqid->sequence->counter);
1258         encode_share_access(xdr, arg->fmode);
1259         p = reserve_space(xdr, 32);
1260         p = xdr_encode_hyper(p, arg->clientid);
1261         *p++ = cpu_to_be32(20);
1262         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1263         *p++ = cpu_to_be32(arg->server->s_dev);
1264         xdr_encode_hyper(p, arg->id);
1265 }
1266
1267 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1268 {
1269         __be32 *p;
1270         struct nfs_client *clp;
1271
1272         p = reserve_space(xdr, 4);
1273         switch(arg->open_flags & O_EXCL) {
1274         case 0:
1275                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1276                 encode_attrs(xdr, arg->u.attrs, arg->server);
1277                 break;
1278         default:
1279                 clp = arg->server->nfs_client;
1280                 if (clp->cl_mvops->minor_version > 0) {
1281                         if (nfs4_has_persistent_session(clp)) {
1282                                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1283                                 encode_attrs(xdr, arg->u.attrs, arg->server);
1284                         } else {
1285                                 struct iattr dummy;
1286
1287                                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1288                                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1289                                 dummy.ia_valid = 0;
1290                                 encode_attrs(xdr, &dummy, arg->server);
1291                         }
1292                 } else {
1293                         *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1294                         encode_nfs4_verifier(xdr, &arg->u.verifier);
1295                 }
1296         }
1297 }
1298
1299 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1300 {
1301         __be32 *p;
1302
1303         p = reserve_space(xdr, 4);
1304         switch (arg->open_flags & O_CREAT) {
1305         case 0:
1306                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1307                 break;
1308         default:
1309                 BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
1310                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1311                 encode_createmode(xdr, arg);
1312         }
1313 }
1314
1315 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1316 {
1317         __be32 *p;
1318
1319         p = reserve_space(xdr, 4);
1320         switch (delegation_type) {
1321         case 0:
1322                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1323                 break;
1324         case FMODE_READ:
1325                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1326                 break;
1327         case FMODE_WRITE|FMODE_READ:
1328                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1329                 break;
1330         default:
1331                 BUG();
1332         }
1333 }
1334
1335 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1336 {
1337         __be32 *p;
1338
1339         p = reserve_space(xdr, 4);
1340         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1341         encode_string(xdr, name->len, name->name);
1342 }
1343
1344 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1345 {
1346         __be32 *p;
1347
1348         p = reserve_space(xdr, 4);
1349         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1350         encode_delegation_type(xdr, type);
1351 }
1352
1353 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1354 {
1355         __be32 *p;
1356
1357         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1358         *p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1359         xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1360         encode_string(xdr, name->len, name->name);
1361 }
1362
1363 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1364 {
1365         encode_openhdr(xdr, arg);
1366         encode_opentype(xdr, arg);
1367         switch (arg->claim) {
1368         case NFS4_OPEN_CLAIM_NULL:
1369                 encode_claim_null(xdr, arg->name);
1370                 break;
1371         case NFS4_OPEN_CLAIM_PREVIOUS:
1372                 encode_claim_previous(xdr, arg->u.delegation_type);
1373                 break;
1374         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1375                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1376                 break;
1377         default:
1378                 BUG();
1379         }
1380         hdr->nops++;
1381         hdr->replen += decode_open_maxsz;
1382 }
1383
1384 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1385 {
1386         __be32 *p;
1387
1388         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1389         *p++ = cpu_to_be32(OP_OPEN_CONFIRM);
1390         p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1391         *p = cpu_to_be32(arg->seqid->sequence->counter);
1392         hdr->nops++;
1393         hdr->replen += decode_open_confirm_maxsz;
1394 }
1395
1396 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1397 {
1398         __be32 *p;
1399
1400         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1401         *p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
1402         p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1403         *p = cpu_to_be32(arg->seqid->sequence->counter);
1404         encode_share_access(xdr, arg->fmode);
1405         hdr->nops++;
1406         hdr->replen += decode_open_downgrade_maxsz;
1407 }
1408
1409 static void
1410 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1411 {
1412         int len = fh->size;
1413         __be32 *p;
1414
1415         p = reserve_space(xdr, 8 + len);
1416         *p++ = cpu_to_be32(OP_PUTFH);
1417         xdr_encode_opaque(p, fh->data, len);
1418         hdr->nops++;
1419         hdr->replen += decode_putfh_maxsz;
1420 }
1421
1422 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1423 {
1424         __be32 *p;
1425
1426         p = reserve_space(xdr, 4);
1427         *p = cpu_to_be32(OP_PUTROOTFH);
1428         hdr->nops++;
1429         hdr->replen += decode_putrootfh_maxsz;
1430 }
1431
1432 static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx, const struct nfs_lock_context *l_ctx, int zero_seqid)
1433 {
1434         nfs4_stateid stateid;
1435         __be32 *p;
1436
1437         p = reserve_space(xdr, NFS4_STATEID_SIZE);
1438         if (ctx->state != NULL) {
1439                 nfs4_copy_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
1440                 if (zero_seqid)
1441                         stateid.stateid.seqid = 0;
1442                 xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
1443         } else
1444                 xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1445 }
1446
1447 static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
1448 {
1449         __be32 *p;
1450
1451         p = reserve_space(xdr, 4);
1452         *p = cpu_to_be32(OP_READ);
1453
1454         encode_stateid(xdr, args->context, args->lock_context,
1455                        hdr->minorversion);
1456
1457         p = reserve_space(xdr, 12);
1458         p = xdr_encode_hyper(p, args->offset);
1459         *p = cpu_to_be32(args->count);
1460         hdr->nops++;
1461         hdr->replen += decode_read_maxsz;
1462 }
1463
1464 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1465 {
1466         uint32_t attrs[2] = {
1467                 FATTR4_WORD0_RDATTR_ERROR,
1468                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1469         };
1470         uint32_t dircount = readdir->count >> 1;
1471         __be32 *p;
1472
1473         if (readdir->plus) {
1474                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1475                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1476                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1477                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1478                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1479                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1480                 dircount >>= 1;
1481         }
1482         /* Use mounted_on_fileid only if the server supports it */
1483         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1484                 attrs[0] |= FATTR4_WORD0_FILEID;
1485
1486         p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
1487         *p++ = cpu_to_be32(OP_READDIR);
1488         p = xdr_encode_hyper(p, readdir->cookie);
1489         p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
1490         *p++ = cpu_to_be32(dircount);
1491         *p++ = cpu_to_be32(readdir->count);
1492         *p++ = cpu_to_be32(2);
1493
1494         *p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
1495         *p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
1496         hdr->nops++;
1497         hdr->replen += decode_readdir_maxsz;
1498         dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
1499                         __func__,
1500                         (unsigned long long)readdir->cookie,
1501                         ((u32 *)readdir->verifier.data)[0],
1502                         ((u32 *)readdir->verifier.data)[1],
1503                         attrs[0] & readdir->bitmask[0],
1504                         attrs[1] & readdir->bitmask[1]);
1505 }
1506
1507 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1508 {
1509         __be32 *p;
1510
1511         p = reserve_space(xdr, 4);
1512         *p = cpu_to_be32(OP_READLINK);
1513         hdr->nops++;
1514         hdr->replen += decode_readlink_maxsz;
1515 }
1516
1517 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1518 {
1519         __be32 *p;
1520
1521         p = reserve_space(xdr, 8 + name->len);
1522         *p++ = cpu_to_be32(OP_REMOVE);
1523         xdr_encode_opaque(p, name->name, name->len);
1524         hdr->nops++;
1525         hdr->replen += decode_remove_maxsz;
1526 }
1527
1528 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1529 {
1530         __be32 *p;
1531
1532         p = reserve_space(xdr, 4);
1533         *p = cpu_to_be32(OP_RENAME);
1534         encode_string(xdr, oldname->len, oldname->name);
1535         encode_string(xdr, newname->len, newname->name);
1536         hdr->nops++;
1537         hdr->replen += decode_rename_maxsz;
1538 }
1539
1540 static void encode_renew(struct xdr_stream *xdr, const struct nfs_client *client_stateid, struct compound_hdr *hdr)
1541 {
1542         __be32 *p;
1543
1544         p = reserve_space(xdr, 12);
1545         *p++ = cpu_to_be32(OP_RENEW);
1546         xdr_encode_hyper(p, client_stateid->cl_clientid);
1547         hdr->nops++;
1548         hdr->replen += decode_renew_maxsz;
1549 }
1550
1551 static void
1552 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1553 {
1554         __be32 *p;
1555
1556         p = reserve_space(xdr, 4);
1557         *p = cpu_to_be32(OP_RESTOREFH);
1558         hdr->nops++;
1559         hdr->replen += decode_restorefh_maxsz;
1560 }
1561
1562 static void
1563 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1564 {
1565         __be32 *p;
1566
1567         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1568         *p++ = cpu_to_be32(OP_SETATTR);
1569         xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1570         p = reserve_space(xdr, 2*4);
1571         *p++ = cpu_to_be32(1);
1572         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1573         BUG_ON(arg->acl_len % 4);
1574         p = reserve_space(xdr, 4);
1575         *p = cpu_to_be32(arg->acl_len);
1576         xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1577         hdr->nops++;
1578         hdr->replen += decode_setacl_maxsz;
1579 }
1580
1581 static void
1582 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1583 {
1584         __be32 *p;
1585
1586         p = reserve_space(xdr, 4);
1587         *p = cpu_to_be32(OP_SAVEFH);
1588         hdr->nops++;
1589         hdr->replen += decode_savefh_maxsz;
1590 }
1591
1592 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1593 {
1594         __be32 *p;
1595
1596         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1597         *p++ = cpu_to_be32(OP_SETATTR);
1598         xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
1599         hdr->nops++;
1600         hdr->replen += decode_setattr_maxsz;
1601         encode_attrs(xdr, arg->iap, server);
1602 }
1603
1604 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1605 {
1606         __be32 *p;
1607
1608         p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
1609         *p++ = cpu_to_be32(OP_SETCLIENTID);
1610         xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);
1611
1612         encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1613         p = reserve_space(xdr, 4);
1614         *p = cpu_to_be32(setclientid->sc_prog);
1615         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1616         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1617         p = reserve_space(xdr, 4);
1618         *p = cpu_to_be32(setclientid->sc_cb_ident);
1619         hdr->nops++;
1620         hdr->replen += decode_setclientid_maxsz;
1621 }
1622
1623 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1624 {
1625         __be32 *p;
1626
1627         p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
1628         *p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
1629         p = xdr_encode_hyper(p, arg->clientid);
1630         xdr_encode_opaque_fixed(p, arg->confirm.data, NFS4_VERIFIER_SIZE);
1631         hdr->nops++;
1632         hdr->replen += decode_setclientid_confirm_maxsz;
1633 }
1634
1635 static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1636 {
1637         __be32 *p;
1638
1639         p = reserve_space(xdr, 4);
1640         *p = cpu_to_be32(OP_WRITE);
1641
1642         encode_stateid(xdr, args->context, args->lock_context,
1643                        hdr->minorversion);
1644
1645         p = reserve_space(xdr, 16);
1646         p = xdr_encode_hyper(p, args->offset);
1647         *p++ = cpu_to_be32(args->stable);
1648         *p = cpu_to_be32(args->count);
1649
1650         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1651         hdr->nops++;
1652         hdr->replen += decode_write_maxsz;
1653 }
1654
1655 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1656 {
1657         __be32 *p;
1658
1659         p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1660
1661         *p++ = cpu_to_be32(OP_DELEGRETURN);
1662         xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1663         hdr->nops++;
1664         hdr->replen += decode_delegreturn_maxsz;
1665 }
1666
1667 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1668 {
1669         int len = name->len;
1670         __be32 *p;
1671
1672         p = reserve_space(xdr, 8 + len);
1673         *p++ = cpu_to_be32(OP_SECINFO);
1674         xdr_encode_opaque(p, name->name, len);
1675         hdr->nops++;
1676         hdr->replen += decode_secinfo_maxsz;
1677 }
1678
1679 #if defined(CONFIG_NFS_V4_1)
1680 /* NFSv4.1 operations */
1681 static void encode_exchange_id(struct xdr_stream *xdr,
1682                                struct nfs41_exchange_id_args *args,
1683                                struct compound_hdr *hdr)
1684 {
1685         __be32 *p;
1686
1687         p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
1688         *p++ = cpu_to_be32(OP_EXCHANGE_ID);
1689         xdr_encode_opaque_fixed(p, args->verifier->data, sizeof(args->verifier->data));
1690
1691         encode_string(xdr, args->id_len, args->id);
1692
1693         p = reserve_space(xdr, 12);
1694         *p++ = cpu_to_be32(args->flags);
1695         *p++ = cpu_to_be32(0);  /* zero length state_protect4_a */
1696         *p = cpu_to_be32(0);    /* zero length implementation id array */
1697         hdr->nops++;
1698         hdr->replen += decode_exchange_id_maxsz;
1699 }
1700
1701 static void encode_create_session(struct xdr_stream *xdr,
1702                                   struct nfs41_create_session_args *args,
1703                                   struct compound_hdr *hdr)
1704 {
1705         __be32 *p;
1706         char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
1707         uint32_t len;
1708         struct nfs_client *clp = args->client;
1709         u32 max_resp_sz_cached;
1710
1711         /*
1712          * Assumes OPEN is the biggest non-idempotent compound.
1713          * 2 is the verifier.
1714          */
1715         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1716                               RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1717
1718         len = scnprintf(machine_name, sizeof(machine_name), "%s",
1719                         clp->cl_ipaddr);
1720
1721         p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
1722         *p++ = cpu_to_be32(OP_CREATE_SESSION);
1723         p = xdr_encode_hyper(p, clp->cl_clientid);
1724         *p++ = cpu_to_be32(clp->cl_seqid);                      /*Sequence id */
1725         *p++ = cpu_to_be32(args->flags);                        /*flags */
1726
1727         /* Fore Channel */
1728         *p++ = cpu_to_be32(0);                          /* header padding size */
1729         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1730         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1731         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1732         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1733         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1734         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1735
1736         /* Back Channel */
1737         *p++ = cpu_to_be32(0);                          /* header padding size */
1738         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1739         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1740         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1741         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1742         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1743         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1744
1745         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1746         *p++ = cpu_to_be32(1);
1747         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1748
1749         /* authsys_parms rfc1831 */
1750         *p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);     /* stamp */
1751         p = xdr_encode_opaque(p, machine_name, len);
1752         *p++ = cpu_to_be32(0);                          /* UID */
1753         *p++ = cpu_to_be32(0);                          /* GID */
1754         *p = cpu_to_be32(0);                            /* No more gids */
1755         hdr->nops++;
1756         hdr->replen += decode_create_session_maxsz;
1757 }
1758
1759 static void encode_destroy_session(struct xdr_stream *xdr,
1760                                    struct nfs4_session *session,
1761                                    struct compound_hdr *hdr)
1762 {
1763         __be32 *p;
1764         p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
1765         *p++ = cpu_to_be32(OP_DESTROY_SESSION);
1766         xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1767         hdr->nops++;
1768         hdr->replen += decode_destroy_session_maxsz;
1769 }
1770
1771 static void encode_reclaim_complete(struct xdr_stream *xdr,
1772                                     struct nfs41_reclaim_complete_args *args,
1773                                     struct compound_hdr *hdr)
1774 {
1775         __be32 *p;
1776
1777         p = reserve_space(xdr, 8);
1778         *p++ = cpu_to_be32(OP_RECLAIM_COMPLETE);
1779         *p++ = cpu_to_be32(args->one_fs);
1780         hdr->nops++;
1781         hdr->replen += decode_reclaim_complete_maxsz;
1782 }
1783 #endif /* CONFIG_NFS_V4_1 */
1784
1785 static void encode_sequence(struct xdr_stream *xdr,
1786                             const struct nfs4_sequence_args *args,
1787                             struct compound_hdr *hdr)
1788 {
1789 #if defined(CONFIG_NFS_V4_1)
1790         struct nfs4_session *session = args->sa_session;
1791         struct nfs4_slot_table *tp;
1792         struct nfs4_slot *slot;
1793         __be32 *p;
1794
1795         if (!session)
1796                 return;
1797
1798         tp = &session->fc_slot_table;
1799
1800         WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
1801         slot = tp->slots + args->sa_slotid;
1802
1803         p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
1804         *p++ = cpu_to_be32(OP_SEQUENCE);
1805
1806         /*
1807          * Sessionid + seqid + slotid + max slotid + cache_this
1808          */
1809         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1810                 "max_slotid=%d cache_this=%d\n",
1811                 __func__,
1812                 ((u32 *)session->sess_id.data)[0],
1813                 ((u32 *)session->sess_id.data)[1],
1814                 ((u32 *)session->sess_id.data)[2],
1815                 ((u32 *)session->sess_id.data)[3],
1816                 slot->seq_nr, args->sa_slotid,
1817                 tp->highest_used_slotid, args->sa_cache_this);
1818         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1819         *p++ = cpu_to_be32(slot->seq_nr);
1820         *p++ = cpu_to_be32(args->sa_slotid);
1821         *p++ = cpu_to_be32(tp->highest_used_slotid);
1822         *p = cpu_to_be32(args->sa_cache_this);
1823         hdr->nops++;
1824         hdr->replen += decode_sequence_maxsz;
1825 #endif /* CONFIG_NFS_V4_1 */
1826 }
1827
1828 #ifdef CONFIG_NFS_V4_1
1829 static void
1830 encode_getdeviceinfo(struct xdr_stream *xdr,
1831                      const struct nfs4_getdeviceinfo_args *args,
1832                      struct compound_hdr *hdr)
1833 {
1834         __be32 *p;
1835
1836         p = reserve_space(xdr, 16 + NFS4_DEVICEID4_SIZE);
1837         *p++ = cpu_to_be32(OP_GETDEVICEINFO);
1838         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1839                                     NFS4_DEVICEID4_SIZE);
1840         *p++ = cpu_to_be32(args->pdev->layout_type);
1841         *p++ = cpu_to_be32(args->pdev->pglen);          /* gdia_maxcount */
1842         *p++ = cpu_to_be32(0);                          /* bitmap length 0 */
1843         hdr->nops++;
1844         hdr->replen += decode_getdeviceinfo_maxsz;
1845 }
1846
1847 static void
1848 encode_layoutget(struct xdr_stream *xdr,
1849                       const struct nfs4_layoutget_args *args,
1850                       struct compound_hdr *hdr)
1851 {
1852         __be32 *p;
1853
1854         p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
1855         *p++ = cpu_to_be32(OP_LAYOUTGET);
1856         *p++ = cpu_to_be32(0);     /* Signal layout available */
1857         *p++ = cpu_to_be32(args->type);
1858         *p++ = cpu_to_be32(args->range.iomode);
1859         p = xdr_encode_hyper(p, args->range.offset);
1860         p = xdr_encode_hyper(p, args->range.length);
1861         p = xdr_encode_hyper(p, args->minlength);
1862         p = xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
1863         *p = cpu_to_be32(args->maxcount);
1864
1865         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1866                 __func__,
1867                 args->type,
1868                 args->range.iomode,
1869                 (unsigned long)args->range.offset,
1870                 (unsigned long)args->range.length,
1871                 args->maxcount);
1872         hdr->nops++;
1873         hdr->replen += decode_layoutget_maxsz;
1874 }
1875
1876 static int
1877 encode_layoutcommit(struct xdr_stream *xdr,
1878                     struct inode *inode,
1879                     const struct nfs4_layoutcommit_args *args,
1880                     struct compound_hdr *hdr)
1881 {
1882         __be32 *p;
1883
1884         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
1885                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
1886
1887         p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
1888         *p++ = cpu_to_be32(OP_LAYOUTCOMMIT);
1889         /* Only whole file layouts */
1890         p = xdr_encode_hyper(p, 0); /* offset */
1891         p = xdr_encode_hyper(p, NFS4_MAX_UINT64); /* length */
1892         *p++ = cpu_to_be32(0); /* reclaim */
1893         p = xdr_encode_opaque_fixed(p, args->stateid.data, NFS4_STATEID_SIZE);
1894         *p++ = cpu_to_be32(1); /* newoffset = TRUE */
1895         p = xdr_encode_hyper(p, args->lastbytewritten);
1896         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
1897         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
1898
1899         if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
1900                 NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
1901                         NFS_I(inode)->layout, xdr, args);
1902         else {
1903                 p = reserve_space(xdr, 4);
1904                 *p = cpu_to_be32(0); /* no layout-type payload */
1905         }
1906
1907         hdr->nops++;
1908         hdr->replen += decode_layoutcommit_maxsz;
1909         return 0;
1910 }
1911
1912 static void
1913 encode_layoutreturn(struct xdr_stream *xdr,
1914                     const struct nfs4_layoutreturn_args *args,
1915                     struct compound_hdr *hdr)
1916 {
1917         __be32 *p;
1918
1919         p = reserve_space(xdr, 20);
1920         *p++ = cpu_to_be32(OP_LAYOUTRETURN);
1921         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
1922         *p++ = cpu_to_be32(args->layout_type);
1923         *p++ = cpu_to_be32(IOMODE_ANY);
1924         *p = cpu_to_be32(RETURN_FILE);
1925         p = reserve_space(xdr, 16 + NFS4_STATEID_SIZE);
1926         p = xdr_encode_hyper(p, 0);
1927         p = xdr_encode_hyper(p, NFS4_MAX_UINT64);
1928         spin_lock(&args->inode->i_lock);
1929         xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
1930         spin_unlock(&args->inode->i_lock);
1931         if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
1932                 NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
1933                         NFS_I(args->inode)->layout, xdr, args);
1934         } else {
1935                 p = reserve_space(xdr, 4);
1936                 *p = cpu_to_be32(0);
1937         }
1938         hdr->nops++;
1939         hdr->replen += decode_layoutreturn_maxsz;
1940 }
1941 #endif /* CONFIG_NFS_V4_1 */
1942
1943 /*
1944  * END OF "GENERIC" ENCODE ROUTINES.
1945  */
1946
1947 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
1948 {
1949 #if defined(CONFIG_NFS_V4_1)
1950         if (args->sa_session)
1951                 return args->sa_session->clp->cl_mvops->minor_version;
1952 #endif /* CONFIG_NFS_V4_1 */
1953         return 0;
1954 }
1955
1956 /*
1957  * Encode an ACCESS request
1958  */
1959 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
1960                                 const struct nfs4_accessargs *args)
1961 {
1962         struct compound_hdr hdr = {
1963                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1964         };
1965
1966         encode_compound_hdr(xdr, req, &hdr);
1967         encode_sequence(xdr, &args->seq_args, &hdr);
1968         encode_putfh(xdr, args->fh, &hdr);
1969         encode_access(xdr, args->access, &hdr);
1970         encode_getfattr(xdr, args->bitmask, &hdr);
1971         encode_nops(&hdr);
1972 }
1973
1974 /*
1975  * Encode LOOKUP request
1976  */
1977 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
1978                                 const struct nfs4_lookup_arg *args)
1979 {
1980         struct compound_hdr hdr = {
1981                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
1982         };
1983
1984         encode_compound_hdr(xdr, req, &hdr);
1985         encode_sequence(xdr, &args->seq_args, &hdr);
1986         encode_putfh(xdr, args->dir_fh, &hdr);
1987         encode_lookup(xdr, args->name, &hdr);
1988         encode_getfh(xdr, &hdr);
1989         encode_getfattr(xdr, args->bitmask, &hdr);
1990         encode_nops(&hdr);
1991 }
1992
1993 /*
1994  * Encode LOOKUP_ROOT request
1995  */
1996 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
1997                                      struct xdr_stream *xdr,
1998                                      const struct nfs4_lookup_root_arg *args)
1999 {
2000         struct compound_hdr hdr = {
2001                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2002         };
2003
2004         encode_compound_hdr(xdr, req, &hdr);
2005         encode_sequence(xdr, &args->seq_args, &hdr);
2006         encode_putrootfh(xdr, &hdr);
2007         encode_getfh(xdr, &hdr);
2008         encode_getfattr(xdr, args->bitmask, &hdr);
2009         encode_nops(&hdr);
2010 }
2011
2012 /*
2013  * Encode REMOVE request
2014  */
2015 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2016                                 const struct nfs_removeargs *args)
2017 {
2018         struct compound_hdr hdr = {
2019                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2020         };
2021
2022         encode_compound_hdr(xdr, req, &hdr);
2023         encode_sequence(xdr, &args->seq_args, &hdr);
2024         encode_putfh(xdr, args->fh, &hdr);
2025         encode_remove(xdr, &args->name, &hdr);
2026         encode_getfattr(xdr, args->bitmask, &hdr);
2027         encode_nops(&hdr);
2028 }
2029
2030 /*
2031  * Encode RENAME request
2032  */
2033 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2034                                 const struct nfs_renameargs *args)
2035 {
2036         struct compound_hdr hdr = {
2037                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2038         };
2039
2040         encode_compound_hdr(xdr, req, &hdr);
2041         encode_sequence(xdr, &args->seq_args, &hdr);
2042         encode_putfh(xdr, args->old_dir, &hdr);
2043         encode_savefh(xdr, &hdr);
2044         encode_putfh(xdr, args->new_dir, &hdr);
2045         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2046         encode_getfattr(xdr, args->bitmask, &hdr);
2047         encode_restorefh(xdr, &hdr);
2048         encode_getfattr(xdr, args->bitmask, &hdr);
2049         encode_nops(&hdr);
2050 }
2051
2052 /*
2053  * Encode LINK request
2054  */
2055 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2056                              const struct nfs4_link_arg *args)
2057 {
2058         struct compound_hdr hdr = {
2059                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2060         };
2061
2062         encode_compound_hdr(xdr, req, &hdr);
2063         encode_sequence(xdr, &args->seq_args, &hdr);
2064         encode_putfh(xdr, args->fh, &hdr);
2065         encode_savefh(xdr, &hdr);
2066         encode_putfh(xdr, args->dir_fh, &hdr);
2067         encode_link(xdr, args->name, &hdr);
2068         encode_getfattr(xdr, args->bitmask, &hdr);
2069         encode_restorefh(xdr, &hdr);
2070         encode_getfattr(xdr, args->bitmask, &hdr);
2071         encode_nops(&hdr);
2072 }
2073
2074 /*
2075  * Encode CREATE request
2076  */
2077 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2078                                 const struct nfs4_create_arg *args)
2079 {
2080         struct compound_hdr hdr = {
2081                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2082         };
2083
2084         encode_compound_hdr(xdr, req, &hdr);
2085         encode_sequence(xdr, &args->seq_args, &hdr);
2086         encode_putfh(xdr, args->dir_fh, &hdr);
2087         encode_savefh(xdr, &hdr);
2088         encode_create(xdr, args, &hdr);
2089         encode_getfh(xdr, &hdr);
2090         encode_getfattr(xdr, args->bitmask, &hdr);
2091         encode_restorefh(xdr, &hdr);
2092         encode_getfattr(xdr, args->bitmask, &hdr);
2093         encode_nops(&hdr);
2094 }
2095
2096 /*
2097  * Encode SYMLINK request
2098  */
2099 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2100                                  const struct nfs4_create_arg *args)
2101 {
2102         nfs4_xdr_enc_create(req, xdr, args);
2103 }
2104
2105 /*
2106  * Encode GETATTR request
2107  */
2108 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2109                                  const struct nfs4_getattr_arg *args)
2110 {
2111         struct compound_hdr hdr = {
2112                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2113         };
2114
2115         encode_compound_hdr(xdr, req, &hdr);
2116         encode_sequence(xdr, &args->seq_args, &hdr);
2117         encode_putfh(xdr, args->fh, &hdr);
2118         encode_getfattr(xdr, args->bitmask, &hdr);
2119         encode_nops(&hdr);
2120 }
2121
2122 /*
2123  * Encode a CLOSE request
2124  */
2125 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2126                                struct nfs_closeargs *args)
2127 {
2128         struct compound_hdr hdr = {
2129                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2130         };
2131
2132         encode_compound_hdr(xdr, req, &hdr);
2133         encode_sequence(xdr, &args->seq_args, &hdr);
2134         encode_putfh(xdr, args->fh, &hdr);
2135         encode_close(xdr, args, &hdr);
2136         encode_getfattr(xdr, args->bitmask, &hdr);
2137         encode_nops(&hdr);
2138 }
2139
2140 /*
2141  * Encode an OPEN request
2142  */
2143 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2144                               struct nfs_openargs *args)
2145 {
2146         struct compound_hdr hdr = {
2147                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2148         };
2149
2150         encode_compound_hdr(xdr, req, &hdr);
2151         encode_sequence(xdr, &args->seq_args, &hdr);
2152         encode_putfh(xdr, args->fh, &hdr);
2153         encode_savefh(xdr, &hdr);
2154         encode_open(xdr, args, &hdr);
2155         encode_getfh(xdr, &hdr);
2156         encode_getfattr(xdr, args->bitmask, &hdr);
2157         encode_restorefh(xdr, &hdr);
2158         encode_getfattr(xdr, args->bitmask, &hdr);
2159         encode_nops(&hdr);
2160 }
2161
2162 /*
2163  * Encode an OPEN_CONFIRM request
2164  */
2165 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2166                                       struct xdr_stream *xdr,
2167                                       struct nfs_open_confirmargs *args)
2168 {
2169         struct compound_hdr hdr = {
2170                 .nops   = 0,
2171         };
2172
2173         encode_compound_hdr(xdr, req, &hdr);
2174         encode_putfh(xdr, args->fh, &hdr);
2175         encode_open_confirm(xdr, args, &hdr);
2176         encode_nops(&hdr);
2177 }
2178
2179 /*
2180  * Encode an OPEN request with no attributes.
2181  */
2182 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2183                                      struct xdr_stream *xdr,
2184                                      struct nfs_openargs *args)
2185 {
2186         struct compound_hdr hdr = {
2187                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2188         };
2189
2190         encode_compound_hdr(xdr, req, &hdr);
2191         encode_sequence(xdr, &args->seq_args, &hdr);
2192         encode_putfh(xdr, args->fh, &hdr);
2193         encode_open(xdr, args, &hdr);
2194         encode_getfattr(xdr, args->bitmask, &hdr);
2195         encode_nops(&hdr);
2196 }
2197
2198 /*
2199  * Encode an OPEN_DOWNGRADE request
2200  */
2201 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2202                                         struct xdr_stream *xdr,
2203                                         struct nfs_closeargs *args)
2204 {
2205         struct compound_hdr hdr = {
2206                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2207         };
2208
2209         encode_compound_hdr(xdr, req, &hdr);
2210         encode_sequence(xdr, &args->seq_args, &hdr);
2211         encode_putfh(xdr, args->fh, &hdr);
2212         encode_open_downgrade(xdr, args, &hdr);
2213         encode_getfattr(xdr, args->bitmask, &hdr);
2214         encode_nops(&hdr);
2215 }
2216
2217 /*
2218  * Encode a LOCK request
2219  */
2220 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2221                               struct nfs_lock_args *args)
2222 {
2223         struct compound_hdr hdr = {
2224                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2225         };
2226
2227         encode_compound_hdr(xdr, req, &hdr);
2228         encode_sequence(xdr, &args->seq_args, &hdr);
2229         encode_putfh(xdr, args->fh, &hdr);
2230         encode_lock(xdr, args, &hdr);
2231         encode_nops(&hdr);
2232 }
2233
2234 /*
2235  * Encode a LOCKT request
2236  */
2237 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2238                                struct nfs_lockt_args *args)
2239 {
2240         struct compound_hdr hdr = {
2241                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2242         };
2243
2244         encode_compound_hdr(xdr, req, &hdr);
2245         encode_sequence(xdr, &args->seq_args, &hdr);
2246         encode_putfh(xdr, args->fh, &hdr);
2247         encode_lockt(xdr, args, &hdr);
2248         encode_nops(&hdr);
2249 }
2250
2251 /*
2252  * Encode a LOCKU request
2253  */
2254 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2255                                struct nfs_locku_args *args)
2256 {
2257         struct compound_hdr hdr = {
2258                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2259         };
2260
2261         encode_compound_hdr(xdr, req, &hdr);
2262         encode_sequence(xdr, &args->seq_args, &hdr);
2263         encode_putfh(xdr, args->fh, &hdr);
2264         encode_locku(xdr, args, &hdr);
2265         encode_nops(&hdr);
2266 }
2267
2268 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2269                                            struct xdr_stream *xdr,
2270                                         struct nfs_release_lockowner_args *args)
2271 {
2272         struct compound_hdr hdr = {
2273                 .minorversion = 0,
2274         };
2275
2276         encode_compound_hdr(xdr, req, &hdr);
2277         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2278         encode_nops(&hdr);
2279 }
2280
2281 /*
2282  * Encode a READLINK request
2283  */
2284 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2285                                   const struct nfs4_readlink *args)
2286 {
2287         struct compound_hdr hdr = {
2288                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2289         };
2290
2291         encode_compound_hdr(xdr, req, &hdr);
2292         encode_sequence(xdr, &args->seq_args, &hdr);
2293         encode_putfh(xdr, args->fh, &hdr);
2294         encode_readlink(xdr, args, req, &hdr);
2295
2296         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2297                         args->pgbase, args->pglen);
2298         encode_nops(&hdr);
2299 }
2300
2301 /*
2302  * Encode a READDIR request
2303  */
2304 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2305                                  const struct nfs4_readdir_arg *args)
2306 {
2307         struct compound_hdr hdr = {
2308                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2309         };
2310
2311         encode_compound_hdr(xdr, req, &hdr);
2312         encode_sequence(xdr, &args->seq_args, &hdr);
2313         encode_putfh(xdr, args->fh, &hdr);
2314         encode_readdir(xdr, args, req, &hdr);
2315
2316         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2317                          args->pgbase, args->count);
2318         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2319                         __func__, hdr.replen << 2, args->pages,
2320                         args->pgbase, args->count);
2321         encode_nops(&hdr);
2322 }
2323
2324 /*
2325  * Encode a READ request
2326  */
2327 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2328                               struct nfs_readargs *args)
2329 {
2330         struct compound_hdr hdr = {
2331                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2332         };
2333
2334         encode_compound_hdr(xdr, req, &hdr);
2335         encode_sequence(xdr, &args->seq_args, &hdr);
2336         encode_putfh(xdr, args->fh, &hdr);
2337         encode_read(xdr, args, &hdr);
2338
2339         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2340                          args->pages, args->pgbase, args->count);
2341         req->rq_rcv_buf.flags |= XDRBUF_READ;
2342         encode_nops(&hdr);
2343 }
2344
2345 /*
2346  * Encode an SETATTR request
2347  */
2348 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2349                                  struct nfs_setattrargs *args)
2350 {
2351         struct compound_hdr hdr = {
2352                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2353         };
2354
2355         encode_compound_hdr(xdr, req, &hdr);
2356         encode_sequence(xdr, &args->seq_args, &hdr);
2357         encode_putfh(xdr, args->fh, &hdr);
2358         encode_setattr(xdr, args, args->server, &hdr);
2359         encode_getfattr(xdr, args->bitmask, &hdr);
2360         encode_nops(&hdr);
2361 }
2362
2363 /*
2364  * Encode a GETACL request
2365  */
2366 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2367                                 struct nfs_getaclargs *args)
2368 {
2369         struct compound_hdr hdr = {
2370                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2371         };
2372         uint32_t replen;
2373
2374         encode_compound_hdr(xdr, req, &hdr);
2375         encode_sequence(xdr, &args->seq_args, &hdr);
2376         encode_putfh(xdr, args->fh, &hdr);
2377         replen = hdr.replen + op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz + 1;
2378         encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
2379
2380         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2381                 args->acl_pages, args->acl_pgbase, args->acl_len);
2382         encode_nops(&hdr);
2383 }
2384
2385 /*
2386  * Encode a WRITE request
2387  */
2388 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2389                                struct nfs_writeargs *args)
2390 {
2391         struct compound_hdr hdr = {
2392                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2393         };
2394
2395         encode_compound_hdr(xdr, req, &hdr);
2396         encode_sequence(xdr, &args->seq_args, &hdr);
2397         encode_putfh(xdr, args->fh, &hdr);
2398         encode_write(xdr, args, &hdr);
2399         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2400         if (args->bitmask)
2401                 encode_getfattr(xdr, args->bitmask, &hdr);
2402         encode_nops(&hdr);
2403 }
2404
2405 /*
2406  *  a COMMIT request
2407  */
2408 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2409                                 struct nfs_writeargs *args)
2410 {
2411         struct compound_hdr hdr = {
2412                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2413         };
2414
2415         encode_compound_hdr(xdr, req, &hdr);
2416         encode_sequence(xdr, &args->seq_args, &hdr);
2417         encode_putfh(xdr, args->fh, &hdr);
2418         encode_commit(xdr, args, &hdr);
2419         if (args->bitmask)
2420                 encode_getfattr(xdr, args->bitmask, &hdr);
2421         encode_nops(&hdr);
2422 }
2423
2424 /*
2425  * FSINFO request
2426  */
2427 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2428                                 struct nfs4_fsinfo_arg *args)
2429 {
2430         struct compound_hdr hdr = {
2431                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2432         };
2433
2434         encode_compound_hdr(xdr, req, &hdr);
2435         encode_sequence(xdr, &args->seq_args, &hdr);
2436         encode_putfh(xdr, args->fh, &hdr);
2437         encode_fsinfo(xdr, args->bitmask, &hdr);
2438         encode_nops(&hdr);
2439 }
2440
2441 /*
2442  * a PATHCONF request
2443  */
2444 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2445                                   const struct nfs4_pathconf_arg *args)
2446 {
2447         struct compound_hdr hdr = {
2448                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2449         };
2450
2451         encode_compound_hdr(xdr, req, &hdr);
2452         encode_sequence(xdr, &args->seq_args, &hdr);
2453         encode_putfh(xdr, args->fh, &hdr);
2454         encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2455                            &hdr);
2456         encode_nops(&hdr);
2457 }
2458
2459 /*
2460  * a STATFS request
2461  */
2462 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2463                                 const struct nfs4_statfs_arg *args)
2464 {
2465         struct compound_hdr hdr = {
2466                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2467         };
2468
2469         encode_compound_hdr(xdr, req, &hdr);
2470         encode_sequence(xdr, &args->seq_args, &hdr);
2471         encode_putfh(xdr, args->fh, &hdr);
2472         encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2473                            args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2474         encode_nops(&hdr);
2475 }
2476
2477 /*
2478  * GETATTR_BITMAP request
2479  */
2480 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2481                                      struct xdr_stream *xdr,
2482                                      struct nfs4_server_caps_arg *args)
2483 {
2484         struct compound_hdr hdr = {
2485                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2486         };
2487
2488         encode_compound_hdr(xdr, req, &hdr);
2489         encode_sequence(xdr, &args->seq_args, &hdr);
2490         encode_putfh(xdr, args->fhandle, &hdr);
2491         encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2492                            FATTR4_WORD0_LINK_SUPPORT|
2493                            FATTR4_WORD0_SYMLINK_SUPPORT|
2494                            FATTR4_WORD0_ACLSUPPORT, &hdr);
2495         encode_nops(&hdr);
2496 }
2497
2498 /*
2499  * a RENEW request
2500  */
2501 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2502                                struct nfs_client *clp)
2503 {
2504         struct compound_hdr hdr = {
2505                 .nops   = 0,
2506         };
2507
2508         encode_compound_hdr(xdr, req, &hdr);
2509         encode_renew(xdr, clp, &hdr);
2510         encode_nops(&hdr);
2511 }
2512
2513 /*
2514  * a SETCLIENTID request
2515  */
2516 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2517                                      struct xdr_stream *xdr,
2518                                      struct nfs4_setclientid *sc)
2519 {
2520         struct compound_hdr hdr = {
2521                 .nops   = 0,
2522         };
2523
2524         encode_compound_hdr(xdr, req, &hdr);
2525         encode_setclientid(xdr, sc, &hdr);
2526         encode_nops(&hdr);
2527 }
2528
2529 /*
2530  * a SETCLIENTID_CONFIRM request
2531  */
2532 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2533                                              struct xdr_stream *xdr,
2534                                              struct nfs4_setclientid_res *arg)
2535 {
2536         struct compound_hdr hdr = {
2537                 .nops   = 0,
2538         };
2539         const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
2540
2541         encode_compound_hdr(xdr, req, &hdr);
2542         encode_setclientid_confirm(xdr, arg, &hdr);
2543         encode_putrootfh(xdr, &hdr);
2544         encode_fsinfo(xdr, lease_bitmap, &hdr);
2545         encode_nops(&hdr);
2546 }
2547
2548 /*
2549  * DELEGRETURN request
2550  */
2551 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2552                                      struct xdr_stream *xdr,
2553                                      const struct nfs4_delegreturnargs *args)
2554 {
2555         struct compound_hdr hdr = {
2556                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2557         };
2558
2559         encode_compound_hdr(xdr, req, &hdr);
2560         encode_sequence(xdr, &args->seq_args, &hdr);
2561         encode_putfh(xdr, args->fhandle, &hdr);
2562         encode_delegreturn(xdr, args->stateid, &hdr);
2563         encode_getfattr(xdr, args->bitmask, &hdr);
2564         encode_nops(&hdr);
2565 }
2566
2567 /*
2568  * Encode FS_LOCATIONS request
2569  */
2570 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2571                                       struct xdr_stream *xdr,
2572                                       struct nfs4_fs_locations_arg *args)
2573 {
2574         struct compound_hdr hdr = {
2575                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2576         };
2577         uint32_t replen;
2578
2579         encode_compound_hdr(xdr, req, &hdr);
2580         encode_sequence(xdr, &args->seq_args, &hdr);
2581         encode_putfh(xdr, args->dir_fh, &hdr);
2582         encode_lookup(xdr, args->name, &hdr);
2583         replen = hdr.replen;    /* get the attribute into args->page */
2584         encode_fs_locations(xdr, args->bitmask, &hdr);
2585
2586         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2587                         0, PAGE_SIZE);
2588         encode_nops(&hdr);
2589 }
2590
2591 /*
2592  * Encode SECINFO request
2593  */
2594 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2595                                 struct xdr_stream *xdr,
2596                                 struct nfs4_secinfo_arg *args)
2597 {
2598         struct compound_hdr hdr = {
2599                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2600         };
2601
2602         encode_compound_hdr(xdr, req, &hdr);
2603         encode_sequence(xdr, &args->seq_args, &hdr);
2604         encode_putfh(xdr, args->dir_fh, &hdr);
2605         encode_secinfo(xdr, args->name, &hdr);
2606         encode_nops(&hdr);
2607 }
2608
2609 #if defined(CONFIG_NFS_V4_1)
2610 /*
2611  * EXCHANGE_ID request
2612  */
2613 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2614                                      struct xdr_stream *xdr,
2615                                      struct nfs41_exchange_id_args *args)
2616 {
2617         struct compound_hdr hdr = {
2618                 .minorversion = args->client->cl_mvops->minor_version,
2619         };
2620
2621         encode_compound_hdr(xdr, req, &hdr);
2622         encode_exchange_id(xdr, args, &hdr);
2623         encode_nops(&hdr);
2624 }
2625
2626 /*
2627  * a CREATE_SESSION request
2628  */
2629 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2630                                         struct xdr_stream *xdr,
2631                                         struct nfs41_create_session_args *args)
2632 {
2633         struct compound_hdr hdr = {
2634                 .minorversion = args->client->cl_mvops->minor_version,
2635         };
2636
2637         encode_compound_hdr(xdr, req, &hdr);
2638         encode_create_session(xdr, args, &hdr);
2639         encode_nops(&hdr);
2640 }
2641
2642 /*
2643  * a DESTROY_SESSION request
2644  */
2645 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2646                                          struct xdr_stream *xdr,
2647                                          struct nfs4_session *session)
2648 {
2649         struct compound_hdr hdr = {
2650                 .minorversion = session->clp->cl_mvops->minor_version,
2651         };
2652
2653         encode_compound_hdr(xdr, req, &hdr);
2654         encode_destroy_session(xdr, session, &hdr);
2655         encode_nops(&hdr);
2656 }
2657
2658 /*
2659  * a SEQUENCE request
2660  */
2661 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2662                                   struct nfs4_sequence_args *args)
2663 {
2664         struct compound_hdr hdr = {
2665                 .minorversion = nfs4_xdr_minorversion(args),
2666         };
2667
2668         encode_compound_hdr(xdr, req, &hdr);
2669         encode_sequence(xdr, args, &hdr);
2670         encode_nops(&hdr);
2671 }
2672
2673 /*
2674  * a GET_LEASE_TIME request
2675  */
2676 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2677                                         struct xdr_stream *xdr,
2678                                         struct nfs4_get_lease_time_args *args)
2679 {
2680         struct compound_hdr hdr = {
2681                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2682         };
2683         const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
2684
2685         encode_compound_hdr(xdr, req, &hdr);
2686         encode_sequence(xdr, &args->la_seq_args, &hdr);
2687         encode_putrootfh(xdr, &hdr);
2688         encode_fsinfo(xdr, lease_bitmap, &hdr);
2689         encode_nops(&hdr);
2690 }
2691
2692 /*
2693  * a RECLAIM_COMPLETE request
2694  */
2695 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2696                                           struct xdr_stream *xdr,
2697                                 struct nfs41_reclaim_complete_args *args)
2698 {
2699         struct compound_hdr hdr = {
2700                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2701         };
2702
2703         encode_compound_hdr(xdr, req, &hdr);
2704         encode_sequence(xdr, &args->seq_args, &hdr);
2705         encode_reclaim_complete(xdr, args, &hdr);
2706         encode_nops(&hdr);
2707 }
2708
2709 /*
2710  * Encode GETDEVICEINFO request
2711  */
2712 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
2713                                        struct xdr_stream *xdr,
2714                                        struct nfs4_getdeviceinfo_args *args)
2715 {
2716         struct compound_hdr hdr = {
2717                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2718         };
2719
2720         encode_compound_hdr(xdr, req, &hdr);
2721         encode_sequence(xdr, &args->seq_args, &hdr);
2722         encode_getdeviceinfo(xdr, args, &hdr);
2723
2724         /* set up reply kvec. Subtract notification bitmap max size (2)
2725          * so that notification bitmap is put in xdr_buf tail */
2726         xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
2727                          args->pdev->pages, args->pdev->pgbase,
2728                          args->pdev->pglen);
2729
2730         encode_nops(&hdr);
2731 }
2732
2733 /*
2734  *  Encode LAYOUTGET request
2735  */
2736 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
2737                                    struct xdr_stream *xdr,
2738                                    struct nfs4_layoutget_args *args)
2739 {
2740         struct compound_hdr hdr = {
2741                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2742         };
2743
2744         encode_compound_hdr(xdr, req, &hdr);
2745         encode_sequence(xdr, &args->seq_args, &hdr);
2746         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2747         encode_layoutget(xdr, args, &hdr);
2748
2749         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2750             args->layout.pages, 0, args->layout.pglen);
2751
2752         encode_nops(&hdr);
2753 }
2754
2755 /*
2756  *  Encode LAYOUTCOMMIT request
2757  */
2758 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
2759                                       struct xdr_stream *xdr,
2760                                       struct nfs4_layoutcommit_args *args)
2761 {
2762         struct nfs4_layoutcommit_data *data =
2763                 container_of(args, struct nfs4_layoutcommit_data, args);
2764         struct compound_hdr hdr = {
2765                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2766         };
2767
2768         encode_compound_hdr(xdr, req, &hdr);
2769         encode_sequence(xdr, &args->seq_args, &hdr);
2770         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2771         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
2772         encode_getfattr(xdr, args->bitmask, &hdr);
2773         encode_nops(&hdr);
2774 }
2775
2776 /*
2777  * Encode LAYOUTRETURN request
2778  */
2779 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
2780                                       struct xdr_stream *xdr,
2781                                       struct nfs4_layoutreturn_args *args)
2782 {
2783         struct compound_hdr hdr = {
2784                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2785         };
2786
2787         encode_compound_hdr(xdr, req, &hdr);
2788         encode_sequence(xdr, &args->seq_args, &hdr);
2789         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2790         encode_layoutreturn(xdr, args, &hdr);
2791         encode_nops(&hdr);
2792 }
2793 #endif /* CONFIG_NFS_V4_1 */
2794
2795 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
2796 {
2797         dprintk("nfs: %s: prematurely hit end of receive buffer. "
2798                 "Remaining buffer length is %tu words.\n",
2799                 func, xdr->end - xdr->p);
2800 }
2801
2802 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
2803 {
2804         __be32 *p;
2805
2806         p = xdr_inline_decode(xdr, 4);
2807         if (unlikely(!p))
2808                 goto out_overflow;
2809         *len = be32_to_cpup(p);
2810         p = xdr_inline_decode(xdr, *len);
2811         if (unlikely(!p))
2812                 goto out_overflow;
2813         *string = (char *)p;
2814         return 0;
2815 out_overflow:
2816         print_overflow_msg(__func__, xdr);
2817         return -EIO;
2818 }
2819
2820 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
2821 {
2822         __be32 *p;
2823
2824         p = xdr_inline_decode(xdr, 8);
2825         if (unlikely(!p))
2826                 goto out_overflow;
2827         hdr->status = be32_to_cpup(p++);
2828         hdr->taglen = be32_to_cpup(p);
2829
2830         p = xdr_inline_decode(xdr, hdr->taglen + 4);
2831         if (unlikely(!p))
2832                 goto out_overflow;
2833         hdr->tag = (char *)p;
2834         p += XDR_QUADLEN(hdr->taglen);
2835         hdr->nops = be32_to_cpup(p);
2836         if (unlikely(hdr->nops < 1))
2837                 return nfs4_stat_to_errno(hdr->status);
2838         return 0;
2839 out_overflow:
2840         print_overflow_msg(__func__, xdr);
2841         return -EIO;
2842 }
2843
2844 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
2845 {
2846         __be32 *p;
2847         uint32_t opnum;
2848         int32_t nfserr;
2849
2850         p = xdr_inline_decode(xdr, 8);
2851         if (unlikely(!p))
2852                 goto out_overflow;
2853         opnum = be32_to_cpup(p++);
2854         if (opnum != expected) {
2855                 dprintk("nfs: Server returned operation"
2856                         " %d but we issued a request for %d\n",
2857                                 opnum, expected);
2858                 return -EIO;
2859         }
2860         nfserr = be32_to_cpup(p);
2861         if (nfserr != NFS_OK)
2862                 return nfs4_stat_to_errno(nfserr);
2863         return 0;
2864 out_overflow:
2865         print_overflow_msg(__func__, xdr);
2866         return -EIO;
2867 }
2868
2869 /* Dummy routine */
2870 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
2871 {
2872         __be32 *p;
2873         unsigned int strlen;
2874         char *str;
2875
2876         p = xdr_inline_decode(xdr, 12);
2877         if (likely(p))
2878                 return decode_opaque_inline(xdr, &strlen, &str);
2879         print_overflow_msg(__func__, xdr);
2880         return -EIO;
2881 }
2882
2883 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
2884 {
2885         uint32_t bmlen;
2886         __be32 *p;
2887
2888         p = xdr_inline_decode(xdr, 4);
2889         if (unlikely(!p))
2890                 goto out_overflow;
2891         bmlen = be32_to_cpup(p);
2892
2893         bitmap[0] = bitmap[1] = 0;
2894         p = xdr_inline_decode(xdr, (bmlen << 2));
2895         if (unlikely(!p))
2896                 goto out_overflow;
2897         if (bmlen > 0) {
2898                 bitmap[0] = be32_to_cpup(p++);
2899                 if (bmlen > 1)
2900                         bitmap[1] = be32_to_cpup(p);
2901         }
2902         return 0;
2903 out_overflow:
2904         print_overflow_msg(__func__, xdr);
2905         return -EIO;
2906 }
2907
2908 static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, __be32 **savep)
2909 {
2910         __be32 *p;
2911
2912         p = xdr_inline_decode(xdr, 4);
2913         if (unlikely(!p))
2914                 goto out_overflow;
2915         *attrlen = be32_to_cpup(p);
2916         *savep = xdr->p;
2917         return 0;
2918 out_overflow:
2919         print_overflow_msg(__func__, xdr);
2920         return -EIO;
2921 }
2922
2923 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
2924 {
2925         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
2926                 int ret;
2927                 ret = decode_attr_bitmap(xdr, bitmask);
2928                 if (unlikely(ret < 0))
2929                         return ret;
2930                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
2931         } else
2932                 bitmask[0] = bitmask[1] = 0;
2933         dprintk("%s: bitmask=%08x:%08x\n", __func__, bitmask[0], bitmask[1]);
2934         return 0;
2935 }
2936
2937 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
2938 {
2939         __be32 *p;
2940         int ret = 0;
2941
2942         *type = 0;
2943         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
2944                 return -EIO;
2945         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
2946                 p = xdr_inline_decode(xdr, 4);
2947                 if (unlikely(!p))
2948                         goto out_overflow;
2949                 *type = be32_to_cpup(p);
2950                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
2951                         dprintk("%s: bad type %d\n", __func__, *type);
2952                         return -EIO;
2953                 }
2954                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
2955                 ret = NFS_ATTR_FATTR_TYPE;
2956         }
2957         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
2958         return ret;
2959 out_overflow:
2960         print_overflow_msg(__func__, xdr);
2961         return -EIO;
2962 }
2963
2964 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
2965 {
2966         __be32 *p;
2967         int ret = 0;
2968
2969         *change = 0;
2970         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
2971                 return -EIO;
2972         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
2973                 p = xdr_inline_decode(xdr, 8);
2974                 if (unlikely(!p))
2975                         goto out_overflow;
2976                 xdr_decode_hyper(p, change);
2977                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
2978                 ret = NFS_ATTR_FATTR_CHANGE;
2979         }
2980         dprintk("%s: change attribute=%Lu\n", __func__,
2981                         (unsigned long long)*change);
2982         return ret;
2983 out_overflow:
2984         print_overflow_msg(__func__, xdr);
2985         return -EIO;
2986 }
2987
2988 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
2989 {
2990         __be32 *p;
2991         int ret = 0;
2992
2993         *size = 0;
2994         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
2995                 return -EIO;
2996         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
2997                 p = xdr_inline_decode(xdr, 8);
2998                 if (unlikely(!p))
2999                         goto out_overflow;
3000                 xdr_decode_hyper(p, size);
3001                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3002                 ret = NFS_ATTR_FATTR_SIZE;
3003         }
3004         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3005         return ret;
3006 out_overflow:
3007         print_overflow_msg(__func__, xdr);
3008         return -EIO;
3009 }
3010
3011 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3012 {
3013         __be32 *p;
3014
3015         *res = 0;
3016         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3017                 return -EIO;
3018         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3019                 p = xdr_inline_decode(xdr, 4);
3020                 if (unlikely(!p))
3021                         goto out_overflow;
3022                 *res = be32_to_cpup(p);
3023                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3024         }
3025         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3026         return 0;
3027 out_overflow:
3028         print_overflow_msg(__func__, xdr);
3029         return -EIO;
3030 }
3031
3032 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3033 {
3034         __be32 *p;
3035
3036         *res = 0;
3037         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3038                 return -EIO;
3039         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3040                 p = xdr_inline_decode(xdr, 4);
3041                 if (unlikely(!p))
3042                         goto out_overflow;
3043                 *res = be32_to_cpup(p);
3044                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3045         }
3046         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3047         return 0;
3048 out_overflow:
3049         print_overflow_msg(__func__, xdr);
3050         return -EIO;
3051 }
3052
3053 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3054 {
3055         __be32 *p;
3056         int ret = 0;
3057
3058         fsid->major = 0;
3059         fsid->minor = 0;
3060         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3061                 return -EIO;
3062         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3063                 p = xdr_inline_decode(xdr, 16);
3064                 if (unlikely(!p))
3065                         goto out_overflow;
3066                 p = xdr_decode_hyper(p, &fsid->major);
3067                 xdr_decode_hyper(p, &fsid->minor);
3068                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3069                 ret = NFS_ATTR_FATTR_FSID;
3070         }
3071         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3072                         (unsigned long long)fsid->major,
3073                         (unsigned long long)fsid->minor);
3074         return ret;
3075 out_overflow:
3076         print_overflow_msg(__func__, xdr);
3077         return -EIO;
3078 }
3079
3080 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3081 {
3082         __be32 *p;
3083
3084         *res = 60;
3085         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3086                 return -EIO;
3087         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3088                 p = xdr_inline_decode(xdr, 4);
3089                 if (unlikely(!p))
3090                         goto out_overflow;
3091                 *res = be32_to_cpup(p);
3092                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3093         }
3094         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3095         return 0;
3096 out_overflow:
3097         print_overflow_msg(__func__, xdr);
3098         return -EIO;
3099 }
3100
3101 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3102 {
3103         __be32 *p;
3104
3105         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3106                 return -EIO;
3107         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3108                 p = xdr_inline_decode(xdr, 4);
3109                 if (unlikely(!p))
3110                         goto out_overflow;
3111                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3112                 *res = -be32_to_cpup(p);
3113         }
3114         return 0;
3115 out_overflow:
3116         print_overflow_msg(__func__, xdr);
3117         return -EIO;
3118 }
3119
3120 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3121 {
3122         __be32 *p;
3123         int len;
3124
3125         if (fh != NULL)
3126                 memset(fh, 0, sizeof(*fh));
3127
3128         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3129                 return -EIO;
3130         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3131                 p = xdr_inline_decode(xdr, 4);
3132                 if (unlikely(!p))
3133                         goto out_overflow;
3134                 len = be32_to_cpup(p);
3135                 if (len > NFS4_FHSIZE)
3136                         return -EIO;
3137                 p = xdr_inline_decode(xdr, len);
3138                 if (unlikely(!p))
3139                         goto out_overflow;
3140                 if (fh != NULL) {
3141                         memcpy(fh->data, p, len);
3142                         fh->size = len;
3143                 }
3144                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3145         }
3146         return 0;
3147 out_overflow:
3148         print_overflow_msg(__func__, xdr);
3149         return -EIO;
3150 }
3151
3152 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3153 {
3154         __be32 *p;
3155
3156         *res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
3157         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3158                 return -EIO;
3159         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3160                 p = xdr_inline_decode(xdr, 4);
3161                 if (unlikely(!p))
3162                         goto out_overflow;
3163                 *res = be32_to_cpup(p);
3164                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3165         }
3166         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3167         return 0;
3168 out_overflow:
3169         print_overflow_msg(__func__, xdr);
3170         return -EIO;
3171 }
3172
3173 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3174 {
3175         __be32 *p;
3176         int ret = 0;
3177
3178         *fileid = 0;
3179         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3180                 return -EIO;
3181         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3182                 p = xdr_inline_decode(xdr, 8);
3183                 if (unlikely(!p))
3184                         goto out_overflow;
3185                 xdr_decode_hyper(p, fileid);
3186                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3187                 ret = NFS_ATTR_FATTR_FILEID;
3188         }
3189         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3190         return ret;
3191 out_overflow:
3192         print_overflow_msg(__func__, xdr);
3193         return -EIO;
3194 }
3195
3196 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3197 {
3198         __be32 *p;
3199         int ret = 0;
3200
3201         *fileid = 0;
3202         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3203                 return -EIO;
3204         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3205                 p = xdr_inline_decode(xdr, 8);
3206                 if (unlikely(!p))
3207                         goto out_overflow;
3208                 xdr_decode_hyper(p, fileid);
3209                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3210                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3211         }
3212         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3213         return ret;
3214 out_overflow:
3215         print_overflow_msg(__func__, xdr);
3216         return -EIO;
3217 }
3218
3219 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3220 {
3221         __be32 *p;
3222         int status = 0;
3223
3224         *res = 0;
3225         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3226                 return -EIO;
3227         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3228                 p = xdr_inline_decode(xdr, 8);
3229                 if (unlikely(!p))
3230                         goto out_overflow;
3231                 xdr_decode_hyper(p, res);
3232                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3233         }
3234         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3235         return status;
3236 out_overflow:
3237         print_overflow_msg(__func__, xdr);
3238         return -EIO;
3239 }
3240
3241 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3242 {
3243         __be32 *p;
3244         int status = 0;
3245
3246         *res = 0;
3247         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3248                 return -EIO;
3249         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3250                 p = xdr_inline_decode(xdr, 8);
3251                 if (unlikely(!p))
3252                         goto out_overflow;
3253                 xdr_decode_hyper(p, res);
3254                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3255         }
3256         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3257         return status;
3258 out_overflow:
3259         print_overflow_msg(__func__, xdr);
3260         return -EIO;
3261 }
3262
3263 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3264 {
3265         __be32 *p;
3266         int status = 0;
3267
3268         *res = 0;
3269         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3270                 return -EIO;
3271         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3272                 p = xdr_inline_decode(xdr, 8);
3273                 if (unlikely(!p))
3274                         goto out_overflow;
3275                 xdr_decode_hyper(p, res);
3276                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3277         }
3278         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3279         return status;
3280 out_overflow:
3281         print_overflow_msg(__func__, xdr);
3282         return -EIO;
3283 }
3284
3285 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3286 {
3287         u32 n;
3288         __be32 *p;
3289         int status = 0;
3290
3291         p = xdr_inline_decode(xdr, 4);
3292         if (unlikely(!p))
3293                 goto out_overflow;
3294         n = be32_to_cpup(p);
3295         if (n == 0)
3296                 goto root_path;
3297         dprintk("path ");
3298         path->ncomponents = 0;
3299         while (path->ncomponents < n) {
3300                 struct nfs4_string *component = &path->components[path->ncomponents];
3301                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3302                 if (unlikely(status != 0))
3303                         goto out_eio;
3304                 if (path->ncomponents != n)
3305                         dprintk("/");
3306                 dprintk("%s", component->data);
3307                 if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
3308                         path->ncomponents++;
3309                 else {
3310                         dprintk("cannot parse %d components in path\n", n);
3311                         goto out_eio;
3312                 }
3313         }
3314 out:
3315         dprintk("\n");
3316         return status;
3317 root_path:
3318 /* a root pathname is sent as a zero component4 */
3319         path->ncomponents = 1;
3320         path->components[0].len=0;
3321         path->components[0].data=NULL;
3322         dprintk("path /\n");
3323         goto out;
3324 out_eio:
3325         dprintk(" status %d", status);
3326         status = -EIO;
3327         goto out;
3328 out_overflow:
3329         print_overflow_msg(__func__, xdr);
3330         return -EIO;
3331 }
3332
3333 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3334 {
3335         int n;
3336         __be32 *p;
3337         int status = -EIO;
3338
3339         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3340                 goto out;
3341         status = 0;
3342         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3343                 goto out;
3344         dprintk("%s: fsroot ", __func__);
3345         status = decode_pathname(xdr, &res->fs_path);
3346         if (unlikely(status != 0))
3347                 goto out;
3348         p = xdr_inline_decode(xdr, 4);
3349         if (unlikely(!p))
3350                 goto out_overflow;
3351         n = be32_to_cpup(p);
3352         if (n <= 0)
3353                 goto out_eio;
3354         res->nlocations = 0;
3355         while (res->nlocations < n) {
3356                 u32 m;
3357                 struct nfs4_fs_location *loc = &res->locations[res->nlocations];
3358
3359                 p = xdr_inline_decode(xdr, 4);
3360                 if (unlikely(!p))
3361                         goto out_overflow;
3362                 m = be32_to_cpup(p);
3363
3364                 loc->nservers = 0;
3365                 dprintk("%s: servers ", __func__);
3366                 while (loc->nservers < m) {
3367                         struct nfs4_string *server = &loc->servers[loc->nservers];
3368                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3369                         if (unlikely(status != 0))
3370                                 goto out_eio;
3371                         dprintk("%s ", server->data);
3372                         if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
3373                                 loc->nservers++;
3374                         else {
3375                                 unsigned int i;
3376                                 dprintk("%s: using first %u of %u servers "
3377                                         "returned for location %u\n",
3378                                                 __func__,
3379                                                 NFS4_FS_LOCATION_MAXSERVERS,
3380                                                 m, res->nlocations);
3381                                 for (i = loc->nservers; i < m; i++) {
3382                                         unsigned int len;
3383                                         char *data;
3384                                         status = decode_opaque_inline(xdr, &len, &data);
3385                                         if (unlikely(status != 0))
3386                                                 goto out_eio;
3387                                 }
3388                         }
3389                 }
3390                 status = decode_pathname(xdr, &loc->rootpath);
3391                 if (unlikely(status != 0))
3392                         goto out_eio;
3393                 if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
3394                         res->nlocations++;
3395         }
3396         if (res->nlocations != 0)
3397                 status = NFS_ATTR_FATTR_V4_REFERRAL;
3398 out:
3399         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3400         return status;
3401 out_overflow:
3402         print_overflow_msg(__func__, xdr);
3403 out_eio:
3404         status = -EIO;
3405         goto out;
3406 }
3407
3408 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3409 {
3410         __be32 *p;
3411         int status = 0;
3412
3413         *res = 0;
3414         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3415                 return -EIO;
3416         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3417                 p = xdr_inline_decode(xdr, 8);
3418                 if (unlikely(!p))
3419                         goto out_overflow;
3420                 xdr_decode_hyper(p, res);
3421                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3422         }
3423         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3424         return status;
3425 out_overflow:
3426         print_overflow_msg(__func__, xdr);
3427         return -EIO;
3428 }
3429
3430 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3431 {
3432         __be32 *p;
3433         int status = 0;
3434
3435         *maxlink = 1;
3436         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3437                 return -EIO;
3438         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3439                 p = xdr_inline_decode(xdr, 4);
3440                 if (unlikely(!p))
3441                         goto out_overflow;
3442                 *maxlink = be32_to_cpup(p);
3443                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3444         }
3445         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3446         return status;
3447 out_overflow:
3448         print_overflow_msg(__func__, xdr);
3449         return -EIO;
3450 }
3451
3452 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3453 {
3454         __be32 *p;
3455         int status = 0;
3456
3457         *maxname = 1024;
3458         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3459                 return -EIO;
3460         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3461                 p = xdr_inline_decode(xdr, 4);
3462                 if (unlikely(!p))
3463                         goto out_overflow;
3464                 *maxname = be32_to_cpup(p);
3465                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3466         }
3467         dprintk("%s: maxname=%u\n", __func__, *maxname);
3468         return status;
3469 out_overflow:
3470         print_overflow_msg(__func__, xdr);
3471         return -EIO;
3472 }
3473
3474 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3475 {
3476         __be32 *p;
3477         int status = 0;
3478
3479         *res = 1024;
3480         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3481                 return -EIO;
3482         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3483                 uint64_t maxread;
3484                 p = xdr_inline_decode(xdr, 8);
3485                 if (unlikely(!p))
3486                         goto out_overflow;
3487                 xdr_decode_hyper(p, &maxread);
3488                 if (maxread > 0x7FFFFFFF)
3489                         maxread = 0x7FFFFFFF;
3490                 *res = (uint32_t)maxread;
3491                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3492         }
3493         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3494         return status;
3495 out_overflow:
3496         print_overflow_msg(__func__, xdr);
3497         return -EIO;
3498 }
3499
3500 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3501 {
3502         __be32 *p;
3503         int status = 0;
3504
3505         *res = 1024;
3506         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3507                 return -EIO;
3508         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3509                 uint64_t maxwrite;
3510                 p = xdr_inline_decode(xdr, 8);
3511                 if (unlikely(!p))
3512                         goto out_overflow;
3513                 xdr_decode_hyper(p, &maxwrite);
3514                 if (maxwrite > 0x7FFFFFFF)
3515                         maxwrite = 0x7FFFFFFF;
3516                 *res = (uint32_t)maxwrite;
3517                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3518         }
3519         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3520         return status;
3521 out_overflow:
3522         print_overflow_msg(__func__, xdr);
3523         return -EIO;
3524 }
3525
3526 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3527 {
3528         uint32_t tmp;
3529         __be32 *p;
3530         int ret = 0;
3531
3532         *mode = 0;
3533         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3534                 return -EIO;
3535         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3536                 p = xdr_inline_decode(xdr, 4);
3537                 if (unlikely(!p))
3538                         goto out_overflow;
3539                 tmp = be32_to_cpup(p);
3540                 *mode = tmp & ~S_IFMT;
3541                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3542                 ret = NFS_ATTR_FATTR_MODE;
3543         }
3544         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3545         return ret;
3546 out_overflow:
3547         print_overflow_msg(__func__, xdr);
3548         return -EIO;
3549 }
3550
3551 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3552 {
3553         __be32 *p;
3554         int ret = 0;
3555
3556         *nlink = 1;
3557         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3558                 return -EIO;
3559         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3560                 p = xdr_inline_decode(xdr, 4);
3561                 if (unlikely(!p))
3562                         goto out_overflow;
3563                 *nlink = be32_to_cpup(p);
3564                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3565                 ret = NFS_ATTR_FATTR_NLINK;
3566         }
3567         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3568         return ret;
3569 out_overflow:
3570         print_overflow_msg(__func__, xdr);
3571         return -EIO;
3572 }
3573
3574 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3575                 const struct nfs_server *server, uint32_t *uid, int may_sleep)
3576 {
3577         uint32_t len;
3578         __be32 *p;
3579         int ret = 0;
3580
3581         *uid = -2;
3582         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3583                 return -EIO;
3584         if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3585                 p = xdr_inline_decode(xdr, 4);
3586                 if (unlikely(!p))
3587                         goto out_overflow;
3588                 len = be32_to_cpup(p);
3589                 p = xdr_inline_decode(xdr, len);
3590                 if (unlikely(!p))
3591                         goto out_overflow;
3592                 if (!may_sleep) {
3593                         /* do nothing */
3594                 } else if (len < XDR_MAX_NETOBJ) {
3595                         if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
3596                                 ret = NFS_ATTR_FATTR_OWNER;
3597                         else
3598                                 dprintk("%s: nfs_map_name_to_uid failed!\n",
3599                                                 __func__);
3600                 } else
3601                         dprintk("%s: name too long (%u)!\n",
3602                                         __func__, len);
3603                 bitmap[1] &= ~FATTR4_WORD1_OWNER;
3604         }
3605         dprintk("%s: uid=%d\n", __func__, (int)*uid);
3606         return ret;
3607 out_overflow:
3608         print_overflow_msg(__func__, xdr);
3609         return -EIO;
3610 }
3611
3612 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3613                 const struct nfs_server *server, uint32_t *gid, int may_sleep)
3614 {
3615         uint32_t len;
3616         __be32 *p;
3617         int ret = 0;
3618
3619         *gid = -2;
3620         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3621                 return -EIO;
3622         if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3623                 p = xdr_inline_decode(xdr, 4);
3624                 if (unlikely(!p))
3625                         goto out_overflow;
3626                 len = be32_to_cpup(p);
3627                 p = xdr_inline_decode(xdr, len);
3628                 if (unlikely(!p))
3629                         goto out_overflow;
3630                 if (!may_sleep) {
3631                         /* do nothing */
3632                 } else if (len < XDR_MAX_NETOBJ) {
3633                         if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
3634                                 ret = NFS_ATTR_FATTR_GROUP;
3635                         else
3636                                 dprintk("%s: nfs_map_group_to_gid failed!\n",
3637                                                 __func__);
3638                 } else
3639                         dprintk("%s: name too long (%u)!\n",
3640                                         __func__, len);
3641                 bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3642         }
3643         dprintk("%s: gid=%d\n", __func__, (int)*gid);
3644         return ret;
3645 out_overflow:
3646         print_overflow_msg(__func__, xdr);
3647         return -EIO;
3648 }
3649
3650 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3651 {
3652         uint32_t major = 0, minor = 0;
3653         __be32 *p;
3654         int ret = 0;
3655
3656         *rdev = MKDEV(0,0);
3657         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3658                 return -EIO;
3659         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3660                 dev_t tmp;
3661
3662                 p = xdr_inline_decode(xdr, 8);
3663                 if (unlikely(!p))
3664                         goto out_overflow;
3665                 major = be32_to_cpup(p++);
3666                 minor = be32_to_cpup(p);
3667                 tmp = MKDEV(major, minor);
3668                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3669                         *rdev = tmp;
3670                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3671                 ret = NFS_ATTR_FATTR_RDEV;
3672         }
3673         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3674         return ret;
3675 out_overflow:
3676         print_overflow_msg(__func__, xdr);
3677         return -EIO;
3678 }
3679
3680 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3681 {
3682         __be32 *p;
3683         int status = 0;
3684
3685         *res = 0;
3686         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3687                 return -EIO;
3688         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3689                 p = xdr_inline_decode(xdr, 8);
3690                 if (unlikely(!p))
3691                         goto out_overflow;
3692                 xdr_decode_hyper(p, res);
3693                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3694         }
3695         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3696         return status;
3697 out_overflow:
3698         print_overflow_msg(__func__, xdr);
3699         return -EIO;
3700 }
3701
3702 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3703 {
3704         __be32 *p;
3705         int status = 0;
3706
3707         *res = 0;
3708         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3709                 return -EIO;
3710         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3711                 p = xdr_inline_decode(xdr, 8);
3712                 if (unlikely(!p))
3713                         goto out_overflow;
3714                 xdr_decode_hyper(p, res);
3715                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3716         }
3717         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3718         return status;
3719 out_overflow:
3720         print_overflow_msg(__func__, xdr);
3721         return -EIO;
3722 }
3723
3724 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3725 {
3726         __be32 *p;
3727         int status = 0;
3728
3729         *res = 0;
3730         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
3731                 return -EIO;
3732         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3733                 p = xdr_inline_decode(xdr, 8);
3734                 if (unlikely(!p))
3735                         goto out_overflow;
3736                 xdr_decode_hyper(p, res);
3737                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
3738         }
3739         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
3740         return status;
3741 out_overflow:
3742         print_overflow_msg(__func__, xdr);
3743         return -EIO;
3744 }
3745
3746 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
3747 {
3748         __be32 *p;
3749         int ret = 0;
3750
3751         *used = 0;
3752         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
3753                 return -EIO;
3754         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
3755                 p = xdr_inline_decode(xdr, 8);
3756                 if (unlikely(!p))
3757                         goto out_overflow;
3758                 xdr_decode_hyper(p, used);
3759                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
3760                 ret = NFS_ATTR_FATTR_SPACE_USED;
3761         }
3762         dprintk("%s: space used=%Lu\n", __func__,
3763                         (unsigned long long)*used);
3764         return ret;
3765 out_overflow:
3766         print_overflow_msg(__func__, xdr);
3767         return -EIO;
3768 }
3769
3770 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
3771 {
3772         __be32 *p;
3773         uint64_t sec;
3774         uint32_t nsec;
3775
3776         p = xdr_inline_decode(xdr, 12);
3777         if (unlikely(!p))
3778                 goto out_overflow;
3779         p = xdr_decode_hyper(p, &sec);
3780         nsec = be32_to_cpup(p);
3781         time->tv_sec = (time_t)sec;
3782         time->tv_nsec = (long)nsec;
3783         return 0;
3784 out_overflow:
3785         print_overflow_msg(__func__, xdr);
3786         return -EIO;
3787 }
3788
3789 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3790 {
3791         int status = 0;
3792
3793         time->tv_sec = 0;
3794         time->tv_nsec = 0;
3795         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
3796                 return -EIO;
3797         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
3798                 status = decode_attr_time(xdr, time);
3799                 if (status == 0)
3800                         status = NFS_ATTR_FATTR_ATIME;
3801                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
3802         }
3803         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
3804         return status;
3805 }
3806
3807 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3808 {
3809         int status = 0;
3810
3811         time->tv_sec = 0;
3812         time->tv_nsec = 0;
3813         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
3814                 return -EIO;
3815         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
3816                 status = decode_attr_time(xdr, time);
3817                 if (status == 0)
3818                         status = NFS_ATTR_FATTR_CTIME;
3819                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
3820         }
3821         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
3822         return status;
3823 }
3824
3825 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
3826                                   struct timespec *time)
3827 {
3828         int status = 0;
3829
3830         time->tv_sec = 0;
3831         time->tv_nsec = 0;
3832         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
3833                 return -EIO;
3834         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
3835                 status = decode_attr_time(xdr, time);
3836                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
3837         }
3838         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
3839                 (long)time->tv_nsec);
3840         return status;
3841 }
3842
3843 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3844 {
3845         int status = 0;
3846
3847         time->tv_sec = 0;
3848         time->tv_nsec = 0;
3849         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
3850                 return -EIO;
3851         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
3852                 status = decode_attr_time(xdr, time);
3853                 if (status == 0)
3854                         status = NFS_ATTR_FATTR_MTIME;
3855                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
3856         }
3857         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
3858         return status;
3859 }
3860
3861 static int verify_attr_len(struct xdr_stream *xdr, __be32 *savep, uint32_t attrlen)
3862 {
3863         unsigned int attrwords = XDR_QUADLEN(attrlen);
3864         unsigned int nwords = xdr->p - savep;
3865
3866         if (unlikely(attrwords != nwords)) {
3867                 dprintk("%s: server returned incorrect attribute length: "
3868                         "%u %c %u\n",
3869                                 __func__,
3870                                 attrwords << 2,
3871                                 (attrwords < nwords) ? '<' : '>',
3872                                 nwords << 2);
3873                 return -EIO;
3874         }
3875         return 0;
3876 }
3877
3878 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3879 {
3880         __be32 *p;
3881
3882         p = xdr_inline_decode(xdr, 20);
3883         if (unlikely(!p))
3884                 goto out_overflow;
3885         cinfo->atomic = be32_to_cpup(p++);
3886         p = xdr_decode_hyper(p, &cinfo->before);
3887         xdr_decode_hyper(p, &cinfo->after);
3888         return 0;
3889 out_overflow:
3890         print_overflow_msg(__func__, xdr);
3891         return -EIO;
3892 }
3893
3894 static int decode_access(struct xdr_stream *xdr, struct nfs4_accessres *access)
3895 {
3896         __be32 *p;
3897         uint32_t supp, acc;
3898         int status;
3899
3900         status = decode_op_hdr(xdr, OP_ACCESS);
3901         if (status)
3902                 return status;
3903         p = xdr_inline_decode(xdr, 8);
3904         if (unlikely(!p))
3905                 goto out_overflow;
3906         supp = be32_to_cpup(p++);
3907         acc = be32_to_cpup(p);
3908         access->supported = supp;
3909         access->access = acc;
3910         return 0;
3911 out_overflow:
3912         print_overflow_msg(__func__, xdr);
3913         return -EIO;
3914 }
3915
3916 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
3917 {
3918         __be32 *p;
3919
3920         p = xdr_inline_decode(xdr, len);
3921         if (likely(p)) {
3922                 memcpy(buf, p, len);
3923                 return 0;
3924         }
3925         print_overflow_msg(__func__, xdr);
3926         return -EIO;
3927 }
3928
3929 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
3930 {
3931         return decode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
3932 }
3933
3934 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
3935 {
3936         int status;
3937
3938         status = decode_op_hdr(xdr, OP_CLOSE);
3939         if (status != -EIO)
3940                 nfs_increment_open_seqid(status, res->seqid);
3941         if (!status)
3942                 status = decode_stateid(xdr, &res->stateid);
3943         return status;
3944 }
3945
3946 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
3947 {
3948         return decode_opaque_fixed(xdr, verifier, 8);
3949 }
3950
3951 static int decode_commit(struct xdr_stream *xdr, struct nfs_writeres *res)
3952 {
3953         int status;
3954
3955         status = decode_op_hdr(xdr, OP_COMMIT);
3956         if (!status)
3957                 status = decode_verifier(xdr, res->verf->verifier);
3958         return status;
3959 }
3960
3961 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3962 {
3963         __be32 *p;
3964         uint32_t bmlen;
3965         int status;
3966
3967         status = decode_op_hdr(xdr, OP_CREATE);
3968         if (status)
3969                 return status;
3970         if ((status = decode_change_info(xdr, cinfo)))
3971                 return status;
3972         p = xdr_inline_decode(xdr, 4);
3973         if (unlikely(!p))
3974                 goto out_overflow;
3975         bmlen = be32_to_cpup(p);
3976         p = xdr_inline_decode(xdr, bmlen << 2);
3977         if (likely(p))
3978                 return 0;
3979 out_overflow:
3980         print_overflow_msg(__func__, xdr);
3981         return -EIO;
3982 }
3983
3984 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
3985 {
3986         __be32 *savep;
3987         uint32_t attrlen, bitmap[2] = {0};
3988         int status;
3989
3990         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3991                 goto xdr_error;
3992         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3993                 goto xdr_error;
3994         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3995                 goto xdr_error;
3996         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
3997                 goto xdr_error;
3998         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
3999                 goto xdr_error;
4000         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4001                 goto xdr_error;
4002         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4003                 goto xdr_error;
4004         status = verify_attr_len(xdr, savep, attrlen);
4005 xdr_error:
4006         dprintk("%s: xdr returned %d!\n", __func__, -status);
4007         return status;
4008 }
4009
4010 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4011 {
4012         __be32 *savep;
4013         uint32_t attrlen, bitmap[2] = {0};
4014         int status;
4015
4016         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4017                 goto xdr_error;
4018         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4019                 goto xdr_error;
4020         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4021                 goto xdr_error;
4022
4023         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4024                 goto xdr_error;
4025         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4026                 goto xdr_error;
4027         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4028                 goto xdr_error;
4029         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4030                 goto xdr_error;
4031         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4032                 goto xdr_error;
4033         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4034                 goto xdr_error;
4035
4036         status = verify_attr_len(xdr, savep, attrlen);
4037 xdr_error:
4038         dprintk("%s: xdr returned %d!\n", __func__, -status);
4039         return status;
4040 }
4041
4042 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4043 {
4044         __be32 *savep;
4045         uint32_t attrlen, bitmap[2] = {0};
4046         int status;
4047
4048         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4049                 goto xdr_error;
4050         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4051                 goto xdr_error;
4052         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4053                 goto xdr_error;
4054
4055         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4056                 goto xdr_error;
4057         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4058                 goto xdr_error;
4059
4060         status = verify_attr_len(xdr, savep, attrlen);
4061 xdr_error:
4062         dprintk("%s: xdr returned %d!\n", __func__, -status);
4063         return status;
4064 }
4065
4066 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4067                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4068                 const struct nfs_server *server, int may_sleep)
4069 {
4070         int status;
4071         umode_t fmode = 0;
4072         uint32_t type;
4073         int32_t err;
4074
4075         status = decode_attr_type(xdr, bitmap, &type);
4076         if (status < 0)
4077                 goto xdr_error;
4078         fattr->mode = 0;
4079         if (status != 0) {
4080                 fattr->mode |= nfs_type2fmt[type];
4081                 fattr->valid |= status;
4082         }
4083
4084         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4085         if (status < 0)
4086                 goto xdr_error;
4087         fattr->valid |= status;
4088
4089         status = decode_attr_size(xdr, bitmap, &fattr->size);
4090         if (status < 0)
4091                 goto xdr_error;
4092         fattr->valid |= status;
4093
4094         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4095         if (status < 0)
4096                 goto xdr_error;
4097         fattr->valid |= status;
4098
4099         err = 0;
4100         status = decode_attr_error(xdr, bitmap, &err);
4101         if (status < 0)
4102                 goto xdr_error;
4103         if (err == -NFS4ERR_WRONGSEC)
4104                 nfs_fixup_secinfo_attributes(fattr, fh);
4105
4106         status = decode_attr_filehandle(xdr, bitmap, fh);
4107         if (status < 0)
4108                 goto xdr_error;
4109
4110         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4111         if (status < 0)
4112                 goto xdr_error;
4113         fattr->valid |= status;
4114
4115         status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
4116                                                 struct nfs4_fs_locations,
4117                                                 fattr));
4118         if (status < 0)
4119                 goto xdr_error;
4120         fattr->valid |= status;
4121
4122         status = decode_attr_mode(xdr, bitmap, &fmode);
4123         if (status < 0)
4124                 goto xdr_error;
4125         if (status != 0) {
4126                 fattr->mode |= fmode;
4127                 fattr->valid |= status;
4128         }
4129
4130         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4131         if (status < 0)
4132                 goto xdr_error;
4133         fattr->valid |= status;
4134
4135         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, may_sleep);
4136         if (status < 0)
4137                 goto xdr_error;
4138         fattr->valid |= status;
4139
4140         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, may_sleep);
4141         if (status < 0)
4142                 goto xdr_error;
4143         fattr->valid |= status;
4144
4145         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4146         if (status < 0)
4147                 goto xdr_error;
4148         fattr->valid |= status;
4149
4150         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4151         if (status < 0)
4152                 goto xdr_error;
4153         fattr->valid |= status;
4154
4155         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4156         if (status < 0)
4157                 goto xdr_error;
4158         fattr->valid |= status;
4159
4160         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4161         if (status < 0)
4162                 goto xdr_error;
4163         fattr->valid |= status;
4164
4165         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4166         if (status < 0)
4167                 goto xdr_error;
4168         fattr->valid |= status;
4169
4170         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4171         if (status < 0)
4172                 goto xdr_error;
4173         fattr->valid |= status;
4174
4175 xdr_error:
4176         dprintk("%s: xdr returned %d\n", __func__, -status);
4177         return status;
4178 }
4179
4180 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4181                 struct nfs_fh *fh, const struct nfs_server *server, int may_sleep)
4182 {
4183         __be32 *savep;
4184         uint32_t attrlen,
4185                  bitmap[2] = {0};
4186         int status;
4187
4188         status = decode_op_hdr(xdr, OP_GETATTR);
4189         if (status < 0)
4190                 goto xdr_error;
4191
4192         status = decode_attr_bitmap(xdr, bitmap);
4193         if (status < 0)
4194                 goto xdr_error;
4195
4196         status = decode_attr_length(xdr, &attrlen, &savep);
4197         if (status < 0)
4198                 goto xdr_error;
4199
4200         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, server, may_sleep);
4201         if (status < 0)
4202                 goto xdr_error;
4203
4204         status = verify_attr_len(xdr, savep, attrlen);
4205 xdr_error:
4206         dprintk("%s: xdr returned %d\n", __func__, -status);
4207         return status;
4208 }
4209
4210 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4211                 const struct nfs_server *server, int may_sleep)
4212 {
4213         return decode_getfattr_generic(xdr, fattr, NULL, server, may_sleep);
4214 }
4215
4216 /*
4217  * Decode potentially multiple layout types. Currently we only support
4218  * one layout driver per file system.
4219  */
4220 static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
4221                                          uint32_t *layouttype)
4222 {
4223         uint32_t *p;
4224         int num;
4225
4226         p = xdr_inline_decode(xdr, 4);
4227         if (unlikely(!p))
4228                 goto out_overflow;
4229         num = be32_to_cpup(p);
4230
4231         /* pNFS is not supported by the underlying file system */
4232         if (num == 0) {
4233                 *layouttype = 0;
4234                 return 0;
4235         }
4236         if (num > 1)
4237                 printk(KERN_INFO "%s: Warning: Multiple pNFS layout drivers "
4238                         "per filesystem not supported\n", __func__);
4239
4240         /* Decode and set first layout type, move xdr->p past unused types */
4241         p = xdr_inline_decode(xdr, num * 4);
4242         if (unlikely(!p))
4243                 goto out_overflow;
4244         *layouttype = be32_to_cpup(p);
4245         return 0;
4246 out_overflow:
4247         print_overflow_msg(__func__, xdr);
4248         return -EIO;
4249 }
4250
4251 /*
4252  * The type of file system exported.
4253  * Note we must ensure that layouttype is set in any non-error case.
4254  */
4255 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4256                                 uint32_t *layouttype)
4257 {
4258         int status = 0;
4259
4260         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4261         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4262                 return -EIO;
4263         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4264                 status = decode_first_pnfs_layout_type(xdr, layouttype);
4265                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4266         } else
4267                 *layouttype = 0;
4268         return status;
4269 }
4270
4271 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4272 {
4273         __be32 *savep;
4274         uint32_t attrlen, bitmap[2];
4275         int status;
4276
4277         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4278                 goto xdr_error;
4279         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4280                 goto xdr_error;
4281         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4282                 goto xdr_error;
4283
4284         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4285
4286         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4287                 goto xdr_error;
4288         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4289                 goto xdr_error;
4290         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4291                 goto xdr_error;
4292         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4293         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4294                 goto xdr_error;
4295         fsinfo->wtpref = fsinfo->wtmax;
4296         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4297         if (status != 0)
4298                 goto xdr_error;
4299         status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4300         if (status != 0)
4301                 goto xdr_error;
4302
4303         status = verify_attr_len(xdr, savep, attrlen);
4304 xdr_error:
4305         dprintk("%s: xdr returned %d!\n", __func__, -status);
4306         return status;
4307 }
4308
4309 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4310 {
4311         __be32 *p;
4312         uint32_t len;
4313         int status;
4314
4315         /* Zero handle first to allow comparisons */
4316         memset(fh, 0, sizeof(*fh));
4317
4318         status = decode_op_hdr(xdr, OP_GETFH);
4319         if (status)
4320                 return status;
4321
4322         p = xdr_inline_decode(xdr, 4);
4323         if (unlikely(!p))
4324                 goto out_overflow;
4325         len = be32_to_cpup(p);
4326         if (len > NFS4_FHSIZE)
4327                 return -EIO;
4328         fh->size = len;
4329         p = xdr_inline_decode(xdr, len);
4330         if (unlikely(!p))
4331                 goto out_overflow;
4332         memcpy(fh->data, p, len);
4333         return 0;
4334 out_overflow:
4335         print_overflow_msg(__func__, xdr);
4336         return -EIO;
4337 }
4338
4339 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4340 {
4341         int status;
4342
4343         status = decode_op_hdr(xdr, OP_LINK);
4344         if (status)
4345                 return status;
4346         return decode_change_info(xdr, cinfo);
4347 }
4348
4349 /*
4350  * We create the owner, so we know a proper owner.id length is 4.
4351  */
4352 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4353 {
4354         uint64_t offset, length, clientid;
4355         __be32 *p;
4356         uint32_t namelen, type;
4357
4358         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4359         if (unlikely(!p))
4360                 goto out_overflow;
4361         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4362         p = xdr_decode_hyper(p, &length);
4363         type = be32_to_cpup(p++); /* 4 byte read */
4364         if (fl != NULL) { /* manipulate file lock */
4365                 fl->fl_start = (loff_t)offset;
4366                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4367                 if (length == ~(uint64_t)0)
4368                         fl->fl_end = OFFSET_MAX;
4369                 fl->fl_type = F_WRLCK;
4370                 if (type & 1)
4371                         fl->fl_type = F_RDLCK;
4372                 fl->fl_pid = 0;
4373         }
4374         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4375         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4376         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4377         if (likely(p))
4378                 return -NFS4ERR_DENIED;
4379 out_overflow:
4380         print_overflow_msg(__func__, xdr);
4381         return -EIO;
4382 }
4383
4384 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4385 {
4386         int status;
4387
4388         status = decode_op_hdr(xdr, OP_LOCK);
4389         if (status == -EIO)
4390                 goto out;
4391         if (status == 0) {
4392                 status = decode_stateid(xdr, &res->stateid);
4393                 if (unlikely(status))
4394                         goto out;
4395         } else if (status == -NFS4ERR_DENIED)
4396                 status = decode_lock_denied(xdr, NULL);
4397         if (res->open_seqid != NULL)
4398                 nfs_increment_open_seqid(status, res->open_seqid);
4399         nfs_increment_lock_seqid(status, res->lock_seqid);
4400 out:
4401         return status;
4402 }
4403
4404 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4405 {
4406         int status;
4407         status = decode_op_hdr(xdr, OP_LOCKT);
4408         if (status == -NFS4ERR_DENIED)
4409                 return decode_lock_denied(xdr, res->denied);
4410         return status;
4411 }
4412
4413 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4414 {
4415         int status;
4416
4417         status = decode_op_hdr(xdr, OP_LOCKU);
4418         if (status != -EIO)
4419                 nfs_increment_lock_seqid(status, res->seqid);
4420         if (status == 0)
4421                 status = decode_stateid(xdr, &res->stateid);
4422         return status;
4423 }
4424
4425 static int decode_release_lockowner(struct xdr_stream *xdr)
4426 {
4427         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4428 }
4429
4430 static int decode_lookup(struct xdr_stream *xdr)
4431 {
4432         return decode_op_hdr(xdr, OP_LOOKUP);
4433 }
4434
4435 /* This is too sick! */
4436 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4437 {
4438         __be32 *p;
4439         uint32_t limit_type, nblocks, blocksize;
4440
4441         p = xdr_inline_decode(xdr, 12);
4442         if (unlikely(!p))
4443                 goto out_overflow;
4444         limit_type = be32_to_cpup(p++);
4445         switch (limit_type) {
4446         case 1:
4447                 xdr_decode_hyper(p, maxsize);
4448                 break;
4449         case 2:
4450                 nblocks = be32_to_cpup(p++);
4451                 blocksize = be32_to_cpup(p);
4452                 *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4453         }
4454         return 0;
4455 out_overflow:
4456         print_overflow_msg(__func__, xdr);
4457         return -EIO;
4458 }
4459
4460 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4461 {
4462         __be32 *p;
4463         uint32_t delegation_type;
4464         int status;
4465
4466         p = xdr_inline_decode(xdr, 4);
4467         if (unlikely(!p))
4468                 goto out_overflow;
4469         delegation_type = be32_to_cpup(p);
4470         if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
4471                 res->delegation_type = 0;
4472                 return 0;
4473         }
4474         status = decode_stateid(xdr, &res->delegation);
4475         if (unlikely(status))
4476                 return status;
4477         p = xdr_inline_decode(xdr, 4);
4478         if (unlikely(!p))
4479                 goto out_overflow;
4480         res->do_recall = be32_to_cpup(p);
4481
4482         switch (delegation_type) {
4483         case NFS4_OPEN_DELEGATE_READ:
4484                 res->delegation_type = FMODE_READ;
4485                 break;
4486         case NFS4_OPEN_DELEGATE_WRITE:
4487                 res->delegation_type = FMODE_WRITE|FMODE_READ;
4488                 if (decode_space_limit(xdr, &res->maxsize) < 0)
4489                                 return -EIO;
4490         }
4491         return decode_ace(xdr, NULL, res->server->nfs_client);
4492 out_overflow:
4493         print_overflow_msg(__func__, xdr);
4494         return -EIO;
4495 }
4496
4497 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
4498 {
4499         __be32 *p;
4500         uint32_t savewords, bmlen, i;
4501         int status;
4502
4503         status = decode_op_hdr(xdr, OP_OPEN);
4504         if (status != -EIO)
4505                 nfs_increment_open_seqid(status, res->seqid);
4506         if (!status)
4507                 status = decode_stateid(xdr, &res->stateid);
4508         if (unlikely(status))
4509                 return status;
4510
4511         decode_change_info(xdr, &res->cinfo);
4512
4513         p = xdr_inline_decode(xdr, 8);
4514         if (unlikely(!p))
4515                 goto out_overflow;
4516         res->rflags = be32_to_cpup(p++);
4517         bmlen = be32_to_cpup(p);
4518         if (bmlen > 10)
4519                 goto xdr_error;
4520
4521         p = xdr_inline_decode(xdr, bmlen << 2);
4522         if (unlikely(!p))
4523                 goto out_overflow;
4524         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
4525         for (i = 0; i < savewords; ++i)
4526                 res->attrset[i] = be32_to_cpup(p++);
4527         for (; i < NFS4_BITMAP_SIZE; i++)
4528                 res->attrset[i] = 0;
4529
4530         return decode_delegation(xdr, res);
4531 xdr_error:
4532         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
4533         return -EIO;
4534 out_overflow:
4535         print_overflow_msg(__func__, xdr);
4536         return -EIO;
4537 }
4538
4539 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
4540 {
4541         int status;
4542
4543         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
4544         if (status != -EIO)
4545                 nfs_increment_open_seqid(status, res->seqid);
4546         if (!status)
4547                 status = decode_stateid(xdr, &res->stateid);
4548         return status;
4549 }
4550
4551 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
4552 {
4553         int status;
4554
4555         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
4556         if (status != -EIO)
4557                 nfs_increment_open_seqid(status, res->seqid);
4558         if (!status)
4559                 status = decode_stateid(xdr, &res->stateid);
4560         return status;
4561 }
4562
4563 static int decode_putfh(struct xdr_stream *xdr)
4564 {
4565         return decode_op_hdr(xdr, OP_PUTFH);
4566 }
4567
4568 static int decode_putrootfh(struct xdr_stream *xdr)
4569 {
4570         return decode_op_hdr(xdr, OP_PUTROOTFH);
4571 }
4572
4573 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
4574 {
4575         struct kvec *iov = req->rq_rcv_buf.head;
4576         __be32 *p;
4577         uint32_t count, eof, recvd, hdrlen;
4578         int status;
4579
4580         status = decode_op_hdr(xdr, OP_READ);
4581         if (status)
4582                 return status;
4583         p = xdr_inline_decode(xdr, 8);
4584         if (unlikely(!p))
4585                 goto out_overflow;
4586         eof = be32_to_cpup(p++);
4587         count = be32_to_cpup(p);
4588         hdrlen = (u8 *) xdr->p - (u8 *) iov->iov_base;
4589         recvd = req->rq_rcv_buf.len - hdrlen;
4590         if (count > recvd) {
4591                 dprintk("NFS: server cheating in read reply: "
4592                                 "count %u > recvd %u\n", count, recvd);
4593                 count = recvd;
4594                 eof = 0;
4595         }
4596         xdr_read_pages(xdr, count);
4597         res->eof = eof;
4598         res->count = count;
4599         return 0;
4600 out_overflow:
4601         print_overflow_msg(__func__, xdr);
4602         return -EIO;
4603 }
4604
4605 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
4606 {
4607         struct xdr_buf  *rcvbuf = &req->rq_rcv_buf;
4608         struct kvec     *iov = rcvbuf->head;
4609         size_t          hdrlen;
4610         u32             recvd, pglen = rcvbuf->page_len;
4611         int             status;
4612
4613         status = decode_op_hdr(xdr, OP_READDIR);
4614         if (!status)
4615                 status = decode_verifier(xdr, readdir->verifier.data);
4616         if (unlikely(status))
4617                 return status;
4618         dprintk("%s: verifier = %08x:%08x\n",
4619                         __func__,
4620                         ((u32 *)readdir->verifier.data)[0],
4621                         ((u32 *)readdir->verifier.data)[1]);
4622
4623
4624         hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4625         recvd = rcvbuf->len - hdrlen;
4626         if (pglen > recvd)
4627                 pglen = recvd;
4628         xdr_read_pages(xdr, pglen);
4629
4630
4631         return pglen;
4632 }
4633
4634 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
4635 {
4636         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
4637         struct kvec *iov = rcvbuf->head;
4638         size_t hdrlen;
4639         u32 len, recvd;
4640         __be32 *p;
4641         int status;
4642
4643         status = decode_op_hdr(xdr, OP_READLINK);
4644         if (status)
4645                 return status;
4646
4647         /* Convert length of symlink */
4648         p = xdr_inline_decode(xdr, 4);
4649         if (unlikely(!p))
4650                 goto out_overflow;
4651         len = be32_to_cpup(p);
4652         if (len >= rcvbuf->page_len || len <= 0) {
4653                 dprintk("nfs: server returned giant symlink!\n");
4654                 return -ENAMETOOLONG;
4655         }
4656         hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4657         recvd = req->rq_rcv_buf.len - hdrlen;
4658         if (recvd < len) {
4659                 dprintk("NFS: server cheating in readlink reply: "
4660                                 "count %u > recvd %u\n", len, recvd);
4661                 return -EIO;
4662         }
4663         xdr_read_pages(xdr, len);
4664         /*
4665          * The XDR encode routine has set things up so that
4666          * the link text will be copied directly into the
4667          * buffer.  We just have to do overflow-checking,
4668          * and and null-terminate the text (the VFS expects
4669          * null-termination).
4670          */
4671         xdr_terminate_string(rcvbuf, len);
4672         return 0;
4673 out_overflow:
4674         print_overflow_msg(__func__, xdr);
4675         return -EIO;
4676 }
4677
4678 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4679 {
4680         int status;
4681
4682         status = decode_op_hdr(xdr, OP_REMOVE);
4683         if (status)
4684                 goto out;
4685         status = decode_change_info(xdr, cinfo);
4686 out:
4687         return status;
4688 }
4689
4690 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
4691               struct nfs4_change_info *new_cinfo)
4692 {
4693         int status;
4694
4695         status = decode_op_hdr(xdr, OP_RENAME);
4696         if (status)
4697                 goto out;
4698         if ((status = decode_change_info(xdr, old_cinfo)))
4699                 goto out;
4700         status = decode_change_info(xdr, new_cinfo);
4701 out:
4702         return status;
4703 }
4704
4705 static int decode_renew(struct xdr_stream *xdr)
4706 {
4707         return decode_op_hdr(xdr, OP_RENEW);
4708 }
4709
4710 static int
4711 decode_restorefh(struct xdr_stream *xdr)
4712 {
4713         return decode_op_hdr(xdr, OP_RESTOREFH);
4714 }
4715
4716 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
4717                 size_t *acl_len)
4718 {
4719         __be32 *savep;
4720         uint32_t attrlen,
4721                  bitmap[2] = {0};
4722         struct kvec *iov = req->rq_rcv_buf.head;
4723         int status;
4724
4725         *acl_len = 0;
4726         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4727                 goto out;
4728         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4729                 goto out;
4730         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4731                 goto out;
4732
4733         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
4734                 return -EIO;
4735         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
4736                 size_t hdrlen;
4737                 u32 recvd;
4738
4739                 /* We ignore &savep and don't do consistency checks on
4740                  * the attr length.  Let userspace figure it out.... */
4741                 hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
4742                 recvd = req->rq_rcv_buf.len - hdrlen;
4743                 if (attrlen > recvd) {
4744                         dprintk("NFS: server cheating in getattr"
4745                                         " acl reply: attrlen %u > recvd %u\n",
4746                                         attrlen, recvd);
4747                         return -EINVAL;
4748                 }
4749                 xdr_read_pages(xdr, attrlen);
4750                 *acl_len = attrlen;
4751         } else
4752                 status = -EOPNOTSUPP;
4753
4754 out:
4755         return status;
4756 }
4757
4758 static int
4759 decode_savefh(struct xdr_stream *xdr)
4760 {
4761         return decode_op_hdr(xdr, OP_SAVEFH);
4762 }
4763
4764 static int decode_setattr(struct xdr_stream *xdr)
4765 {
4766         __be32 *p;
4767         uint32_t bmlen;
4768         int status;
4769
4770         status = decode_op_hdr(xdr, OP_SETATTR);
4771         if (status)
4772                 return status;
4773         p = xdr_inline_decode(xdr, 4);
4774         if (unlikely(!p))
4775                 goto out_overflow;
4776         bmlen = be32_to_cpup(p);
4777         p = xdr_inline_decode(xdr, bmlen << 2);
4778         if (likely(p))
4779                 return 0;
4780 out_overflow:
4781         print_overflow_msg(__func__, xdr);
4782         return -EIO;
4783 }
4784
4785 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
4786 {
4787         __be32 *p;
4788         uint32_t opnum;
4789         int32_t nfserr;
4790
4791         p = xdr_inline_decode(xdr, 8);
4792         if (unlikely(!p))
4793                 goto out_overflow;
4794         opnum = be32_to_cpup(p++);
4795         if (opnum != OP_SETCLIENTID) {
4796                 dprintk("nfs: decode_setclientid: Server returned operation"
4797                         " %d\n", opnum);
4798                 return -EIO;
4799         }
4800         nfserr = be32_to_cpup(p);
4801         if (nfserr == NFS_OK) {
4802                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
4803                 if (unlikely(!p))
4804                         goto out_overflow;
4805                 p = xdr_decode_hyper(p, &res->clientid);
4806                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
4807         } else if (nfserr == NFSERR_CLID_INUSE) {
4808                 uint32_t len;
4809
4810                 /* skip netid string */
4811                 p = xdr_inline_decode(xdr, 4);
4812                 if (unlikely(!p))
4813                         goto out_overflow;
4814                 len = be32_to_cpup(p);
4815                 p = xdr_inline_decode(xdr, len);
4816                 if (unlikely(!p))
4817                         goto out_overflow;
4818
4819                 /* skip uaddr string */
4820                 p = xdr_inline_decode(xdr, 4);
4821                 if (unlikely(!p))
4822                         goto out_overflow;
4823                 len = be32_to_cpup(p);
4824                 p = xdr_inline_decode(xdr, len);
4825                 if (unlikely(!p))
4826                         goto out_overflow;
4827                 return -NFSERR_CLID_INUSE;
4828         } else
4829                 return nfs4_stat_to_errno(nfserr);
4830
4831         return 0;
4832 out_overflow:
4833         print_overflow_msg(__func__, xdr);
4834         return -EIO;
4835 }
4836
4837 static int decode_setclientid_confirm(struct xdr_stream *xdr)
4838 {
4839         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
4840 }
4841
4842 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
4843 {
4844         __be32 *p;
4845         int status;
4846
4847         status = decode_op_hdr(xdr, OP_WRITE);
4848         if (status)
4849                 return status;
4850
4851         p = xdr_inline_decode(xdr, 16);
4852         if (unlikely(!p))
4853                 goto out_overflow;
4854         res->count = be32_to_cpup(p++);
4855         res->verf->committed = be32_to_cpup(p++);
4856         memcpy(res->verf->verifier, p, 8);
4857         return 0;
4858 out_overflow:
4859         print_overflow_msg(__func__, xdr);
4860         return -EIO;
4861 }
4862
4863 static int decode_delegreturn(struct xdr_stream *xdr)
4864 {
4865         return decode_op_hdr(xdr, OP_DELEGRETURN);
4866 }
4867
4868 static int decode_secinfo_gss(struct xdr_stream *xdr, struct nfs4_secinfo_flavor *flavor)
4869 {
4870         __be32 *p;
4871
4872         p = xdr_inline_decode(xdr, 4);
4873         if (unlikely(!p))
4874                 goto out_overflow;
4875         flavor->gss.sec_oid4.len = be32_to_cpup(p);
4876         if (flavor->gss.sec_oid4.len > GSS_OID_MAX_LEN)
4877                 goto out_err;
4878
4879         p = xdr_inline_decode(xdr, flavor->gss.sec_oid4.len);
4880         if (unlikely(!p))
4881                 goto out_overflow;
4882         memcpy(flavor->gss.sec_oid4.data, p, flavor->gss.sec_oid4.len);
4883
4884         p = xdr_inline_decode(xdr, 8);
4885         if (unlikely(!p))
4886                 goto out_overflow;
4887         flavor->gss.qop4 = be32_to_cpup(p++);
4888         flavor->gss.service = be32_to_cpup(p);
4889
4890         return 0;
4891
4892 out_overflow:
4893         print_overflow_msg(__func__, xdr);
4894         return -EIO;
4895 out_err:
4896         return -EINVAL;
4897 }
4898
4899 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
4900 {
4901         struct nfs4_secinfo_flavor *sec_flavor;
4902         int status;
4903         __be32 *p;
4904         int i, num_flavors;
4905
4906         status = decode_op_hdr(xdr, OP_SECINFO);
4907         if (status)
4908                 goto out;
4909         p = xdr_inline_decode(xdr, 4);
4910         if (unlikely(!p))
4911                 goto out_overflow;
4912
4913         res->flavors->num_flavors = 0;
4914         num_flavors = be32_to_cpup(p);
4915
4916         for (i = 0; i < num_flavors; i++) {
4917                 sec_flavor = &res->flavors->flavors[i];
4918                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
4919                         break;
4920
4921                 p = xdr_inline_decode(xdr, 4);
4922                 if (unlikely(!p))
4923                         goto out_overflow;
4924                 sec_flavor->flavor = be32_to_cpup(p);
4925
4926                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
4927                         status = decode_secinfo_gss(xdr, sec_flavor);
4928                         if (status)
4929                                 goto out;
4930                 }
4931                 res->flavors->num_flavors++;
4932         }
4933
4934 out:
4935         return status;
4936 out_overflow:
4937         print_overflow_msg(__func__, xdr);
4938         return -EIO;
4939 }
4940
4941 #if defined(CONFIG_NFS_V4_1)
4942 static int decode_exchange_id(struct xdr_stream *xdr,
4943                               struct nfs41_exchange_id_res *res)
4944 {
4945         __be32 *p;
4946         uint32_t dummy;
4947         char *dummy_str;
4948         int status;
4949         struct nfs_client *clp = res->client;
4950
4951         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
4952         if (status)
4953                 return status;
4954
4955         p = xdr_inline_decode(xdr, 8);
4956         if (unlikely(!p))
4957                 goto out_overflow;
4958         xdr_decode_hyper(p, &clp->cl_clientid);
4959         p = xdr_inline_decode(xdr, 12);
4960         if (unlikely(!p))
4961                 goto out_overflow;
4962         clp->cl_seqid = be32_to_cpup(p++);
4963         clp->cl_exchange_flags = be32_to_cpup(p++);
4964
4965         /* We ask for SP4_NONE */
4966         dummy = be32_to_cpup(p);
4967         if (dummy != SP4_NONE)
4968                 return -EIO;
4969
4970         /* Throw away minor_id */
4971         p = xdr_inline_decode(xdr, 8);
4972         if (unlikely(!p))
4973                 goto out_overflow;
4974
4975         /* Throw away Major id */
4976         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4977         if (unlikely(status))
4978                 return status;
4979
4980         /* Throw away server_scope */
4981         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4982         if (unlikely(status))
4983                 return status;
4984
4985         /* Throw away Implementation id array */
4986         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4987         if (unlikely(status))
4988                 return status;
4989
4990         return 0;
4991 out_overflow:
4992         print_overflow_msg(__func__, xdr);
4993         return -EIO;
4994 }
4995
4996 static int decode_chan_attrs(struct xdr_stream *xdr,
4997                              struct nfs4_channel_attrs *attrs)
4998 {
4999         __be32 *p;
5000         u32 nr_attrs, val;
5001
5002         p = xdr_inline_decode(xdr, 28);
5003         if (unlikely(!p))
5004                 goto out_overflow;
5005         val = be32_to_cpup(p++);        /* headerpadsz */
5006         if (val)
5007                 return -EINVAL;         /* no support for header padding yet */
5008         attrs->max_rqst_sz = be32_to_cpup(p++);
5009         attrs->max_resp_sz = be32_to_cpup(p++);
5010         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5011         attrs->max_ops = be32_to_cpup(p++);
5012         attrs->max_reqs = be32_to_cpup(p++);
5013         nr_attrs = be32_to_cpup(p);
5014         if (unlikely(nr_attrs > 1)) {
5015                 printk(KERN_WARNING "%s: Invalid rdma channel attrs count %u\n",
5016                         __func__, nr_attrs);
5017                 return -EINVAL;
5018         }
5019         if (nr_attrs == 1) {
5020                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5021                 if (unlikely(!p))
5022                         goto out_overflow;
5023         }
5024         return 0;
5025 out_overflow:
5026         print_overflow_msg(__func__, xdr);
5027         return -EIO;
5028 }
5029
5030 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5031 {
5032         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5033 }
5034
5035 static int decode_create_session(struct xdr_stream *xdr,
5036                                  struct nfs41_create_session_res *res)
5037 {
5038         __be32 *p;
5039         int status;
5040         struct nfs_client *clp = res->client;
5041         struct nfs4_session *session = clp->cl_session;
5042
5043         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5044         if (!status)
5045                 status = decode_sessionid(xdr, &session->sess_id);
5046         if (unlikely(status))
5047                 return status;
5048
5049         /* seqid, flags */
5050         p = xdr_inline_decode(xdr, 8);
5051         if (unlikely(!p))
5052                 goto out_overflow;
5053         clp->cl_seqid = be32_to_cpup(p++);
5054         session->flags = be32_to_cpup(p);
5055
5056         /* Channel attributes */
5057         status = decode_chan_attrs(xdr, &session->fc_attrs);
5058         if (!status)
5059                 status = decode_chan_attrs(xdr, &session->bc_attrs);
5060         return status;
5061 out_overflow:
5062         print_overflow_msg(__func__, xdr);
5063         return -EIO;
5064 }
5065
5066 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5067 {
5068         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5069 }
5070
5071 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5072 {
5073         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5074 }
5075 #endif /* CONFIG_NFS_V4_1 */
5076
5077 static int decode_sequence(struct xdr_stream *xdr,
5078                            struct nfs4_sequence_res *res,
5079                            struct rpc_rqst *rqstp)
5080 {
5081 #if defined(CONFIG_NFS_V4_1)
5082         struct nfs4_sessionid id;
5083         u32 dummy;
5084         int status;
5085         __be32 *p;
5086
5087         if (!res->sr_session)
5088                 return 0;
5089
5090         status = decode_op_hdr(xdr, OP_SEQUENCE);
5091         if (!status)
5092                 status = decode_sessionid(xdr, &id);
5093         if (unlikely(status))
5094                 goto out_err;
5095
5096         /*
5097          * If the server returns different values for sessionID, slotID or
5098          * sequence number, the server is looney tunes.
5099          */
5100         status = -EREMOTEIO;
5101
5102         if (memcmp(id.data, res->sr_session->sess_id.data,
5103                    NFS4_MAX_SESSIONID_LEN)) {
5104                 dprintk("%s Invalid session id\n", __func__);
5105                 goto out_err;
5106         }
5107
5108         p = xdr_inline_decode(xdr, 20);
5109         if (unlikely(!p))
5110                 goto out_overflow;
5111
5112         /* seqid */
5113         dummy = be32_to_cpup(p++);
5114         if (dummy != res->sr_slot->seq_nr) {
5115                 dprintk("%s Invalid sequence number\n", __func__);
5116                 goto out_err;
5117         }
5118         /* slot id */
5119         dummy = be32_to_cpup(p++);
5120         if (dummy != res->sr_slot - res->sr_session->fc_slot_table.slots) {
5121                 dprintk("%s Invalid slot id\n", __func__);
5122                 goto out_err;
5123         }
5124         /* highest slot id - currently not processed */
5125         dummy = be32_to_cpup(p++);
5126         /* target highest slot id - currently not processed */
5127         dummy = be32_to_cpup(p++);
5128         /* result flags */
5129         res->sr_status_flags = be32_to_cpup(p);
5130         status = 0;
5131 out_err:
5132         res->sr_status = status;
5133         return status;
5134 out_overflow:
5135         print_overflow_msg(__func__, xdr);
5136         status = -EIO;
5137         goto out_err;
5138 #else  /* CONFIG_NFS_V4_1 */
5139         return 0;
5140 #endif /* CONFIG_NFS_V4_1 */
5141 }
5142
5143 #if defined(CONFIG_NFS_V4_1)
5144
5145 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5146                                 struct pnfs_device *pdev)
5147 {
5148         __be32 *p;
5149         uint32_t len, type;
5150         int status;
5151
5152         status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5153         if (status) {
5154                 if (status == -ETOOSMALL) {
5155                         p = xdr_inline_decode(xdr, 4);
5156                         if (unlikely(!p))
5157                                 goto out_overflow;
5158                         pdev->mincount = be32_to_cpup(p);
5159                         dprintk("%s: Min count too small. mincnt = %u\n",
5160                                 __func__, pdev->mincount);
5161                 }
5162                 return status;
5163         }
5164
5165         p = xdr_inline_decode(xdr, 8);
5166         if (unlikely(!p))
5167                 goto out_overflow;
5168         type = be32_to_cpup(p++);
5169         if (type != pdev->layout_type) {
5170                 dprintk("%s: layout mismatch req: %u pdev: %u\n",
5171                         __func__, pdev->layout_type, type);
5172                 return -EINVAL;
5173         }
5174         /*
5175          * Get the length of the opaque device_addr4. xdr_read_pages places
5176          * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5177          * and places the remaining xdr data in xdr_buf->tail
5178          */
5179         pdev->mincount = be32_to_cpup(p);
5180         xdr_read_pages(xdr, pdev->mincount); /* include space for the length */
5181
5182         /* Parse notification bitmap, verifying that it is zero. */
5183         p = xdr_inline_decode(xdr, 4);
5184         if (unlikely(!p))
5185                 goto out_overflow;
5186         len = be32_to_cpup(p);
5187         if (len) {
5188                 uint32_t i;
5189
5190                 p = xdr_inline_decode(xdr, 4 * len);
5191                 if (unlikely(!p))
5192                         goto out_overflow;
5193                 for (i = 0; i < len; i++, p++) {
5194                         if (be32_to_cpup(p)) {
5195                                 dprintk("%s: notifications not supported\n",
5196                                         __func__);
5197                                 return -EIO;
5198                         }
5199                 }
5200         }
5201         return 0;
5202 out_overflow:
5203         print_overflow_msg(__func__, xdr);
5204         return -EIO;
5205 }
5206
5207 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5208                             struct nfs4_layoutget_res *res)
5209 {
5210         __be32 *p;
5211         int status;
5212         u32 layout_count;
5213         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5214         struct kvec *iov = rcvbuf->head;
5215         u32 hdrlen, recvd;
5216
5217         status = decode_op_hdr(xdr, OP_LAYOUTGET);
5218         if (status)
5219                 return status;
5220         p = xdr_inline_decode(xdr, 8 + NFS4_STATEID_SIZE);
5221         if (unlikely(!p))
5222                 goto out_overflow;
5223         res->return_on_close = be32_to_cpup(p++);
5224         p = xdr_decode_opaque_fixed(p, res->stateid.data, NFS4_STATEID_SIZE);
5225         layout_count = be32_to_cpup(p);
5226         if (!layout_count) {
5227                 dprintk("%s: server responded with empty layout array\n",
5228                         __func__);
5229                 return -EINVAL;
5230         }
5231
5232         p = xdr_inline_decode(xdr, 28);
5233         if (unlikely(!p))
5234                 goto out_overflow;
5235         p = xdr_decode_hyper(p, &res->range.offset);
5236         p = xdr_decode_hyper(p, &res->range.length);
5237         res->range.iomode = be32_to_cpup(p++);
5238         res->type = be32_to_cpup(p++);
5239         res->layoutp->len = be32_to_cpup(p);
5240
5241         dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
5242                 __func__,
5243                 (unsigned long)res->range.offset,
5244                 (unsigned long)res->range.length,
5245                 res->range.iomode,
5246                 res->type,
5247                 res->layoutp->len);
5248
5249         hdrlen = (u8 *) xdr->p - (u8 *) iov->iov_base;
5250         recvd = req->rq_rcv_buf.len - hdrlen;
5251         if (res->layoutp->len > recvd) {
5252                 dprintk("NFS: server cheating in layoutget reply: "
5253                                 "layout len %u > recvd %u\n",
5254                                 res->layoutp->len, recvd);
5255                 return -EINVAL;
5256         }
5257
5258         xdr_read_pages(xdr, res->layoutp->len);
5259
5260         if (layout_count > 1) {
5261                 /* We only handle a length one array at the moment.  Any
5262                  * further entries are just ignored.  Note that this means
5263                  * the client may see a response that is less than the
5264                  * minimum it requested.
5265                  */
5266                 dprintk("%s: server responded with %d layouts, dropping tail\n",
5267                         __func__, layout_count);
5268         }
5269
5270         return 0;
5271 out_overflow:
5272         print_overflow_msg(__func__, xdr);
5273         return -EIO;
5274 }
5275
5276 static int decode_layoutreturn(struct xdr_stream *xdr,
5277                                struct nfs4_layoutreturn_res *res)
5278 {
5279         __be32 *p;
5280         int status;
5281
5282         status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
5283         if (status)
5284                 return status;
5285         p = xdr_inline_decode(xdr, 4);
5286         if (unlikely(!p))
5287                 goto out_overflow;
5288         res->lrs_present = be32_to_cpup(p);
5289         if (res->lrs_present)
5290                 status = decode_stateid(xdr, &res->stateid);
5291         return status;
5292 out_overflow:
5293         print_overflow_msg(__func__, xdr);
5294         return -EIO;
5295 }
5296
5297 static int decode_layoutcommit(struct xdr_stream *xdr,
5298                                struct rpc_rqst *req,
5299                                struct nfs4_layoutcommit_res *res)
5300 {
5301         __be32 *p;
5302         __u32 sizechanged;
5303         int status;
5304
5305         status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
5306         if (status)
5307                 return status;
5308
5309         p = xdr_inline_decode(xdr, 4);
5310         if (unlikely(!p))
5311                 goto out_overflow;
5312         sizechanged = be32_to_cpup(p);
5313
5314         if (sizechanged) {
5315                 /* throw away new size */
5316                 p = xdr_inline_decode(xdr, 8);
5317                 if (unlikely(!p))
5318                         goto out_overflow;
5319         }
5320         return 0;
5321 out_overflow:
5322         print_overflow_msg(__func__, xdr);
5323         return -EIO;
5324 }
5325 #endif /* CONFIG_NFS_V4_1 */
5326
5327 /*
5328  * END OF "GENERIC" DECODE ROUTINES.
5329  */
5330
5331 /*
5332  * Decode OPEN_DOWNGRADE response
5333  */
5334 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
5335                                        struct xdr_stream *xdr,
5336                                        struct nfs_closeres *res)
5337 {
5338         struct compound_hdr hdr;
5339         int status;
5340
5341         status = decode_compound_hdr(xdr, &hdr);
5342         if (status)
5343                 goto out;
5344         status = decode_sequence(xdr, &res->seq_res, rqstp);
5345         if (status)
5346                 goto out;
5347         status = decode_putfh(xdr);
5348         if (status)
5349                 goto out;
5350         status = decode_open_downgrade(xdr, res);
5351         if (status != 0)
5352                 goto out;
5353         decode_getfattr(xdr, res->fattr, res->server,
5354                         !RPC_IS_ASYNC(rqstp->rq_task));
5355 out:
5356         return status;
5357 }
5358
5359 /*
5360  * Decode ACCESS response
5361  */
5362 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5363                                struct nfs4_accessres *res)
5364 {
5365         struct compound_hdr hdr;
5366         int status;
5367
5368         status = decode_compound_hdr(xdr, &hdr);
5369         if (status)
5370                 goto out;
5371         status = decode_sequence(xdr, &res->seq_res, rqstp);
5372         if (status)
5373                 goto out;
5374         status = decode_putfh(xdr);
5375         if (status != 0)
5376                 goto out;
5377         status = decode_access(xdr, res);
5378         if (status != 0)
5379                 goto out;
5380         decode_getfattr(xdr, res->fattr, res->server,
5381                         !RPC_IS_ASYNC(rqstp->rq_task));
5382 out:
5383         return status;
5384 }
5385
5386 /*
5387  * Decode LOOKUP response
5388  */
5389 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5390                                struct nfs4_lookup_res *res)
5391 {
5392         struct compound_hdr hdr;
5393         int status;
5394
5395         status = decode_compound_hdr(xdr, &hdr);
5396         if (status)
5397                 goto out;
5398         status = decode_sequence(xdr, &res->seq_res, rqstp);
5399         if (status)
5400                 goto out;
5401         status = decode_putfh(xdr);
5402         if (status)
5403                 goto out;
5404         status = decode_lookup(xdr);
5405         if (status)
5406                 goto out;
5407         status = decode_getfh(xdr, res->fh);
5408         if (status)
5409                 goto out;
5410         status = decode_getfattr(xdr, res->fattr, res->server
5411                         ,!RPC_IS_ASYNC(rqstp->rq_task));
5412 out:
5413         return status;
5414 }
5415
5416 /*
5417  * Decode LOOKUP_ROOT response
5418  */
5419 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
5420                                     struct xdr_stream *xdr,
5421                                     struct nfs4_lookup_res *res)
5422 {
5423         struct compound_hdr hdr;
5424         int status;
5425
5426         status = decode_compound_hdr(xdr, &hdr);
5427         if (status)
5428                 goto out;
5429         status = decode_sequence(xdr, &res->seq_res, rqstp);
5430         if (status)
5431                 goto out;
5432         status = decode_putrootfh(xdr);
5433         if (status)
5434                 goto out;
5435         status = decode_getfh(xdr, res->fh);
5436         if (status == 0)
5437                 status = decode_getfattr(xdr, res->fattr, res->server,
5438                                 !RPC_IS_ASYNC(rqstp->rq_task));
5439 out:
5440         return status;
5441 }
5442
5443 /*
5444  * Decode REMOVE response
5445  */
5446 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5447                                struct nfs_removeres *res)
5448 {
5449         struct compound_hdr hdr;
5450         int status;
5451
5452         status = decode_compound_hdr(xdr, &hdr);
5453         if (status)
5454                 goto out;
5455         status = decode_sequence(xdr, &res->seq_res, rqstp);
5456         if (status)
5457                 goto out;
5458         status = decode_putfh(xdr);
5459         if (status)
5460                 goto out;
5461         status = decode_remove(xdr, &res->cinfo);
5462         if (status)
5463                 goto out;
5464         decode_getfattr(xdr, res->dir_attr, res->server,
5465                         !RPC_IS_ASYNC(rqstp->rq_task));
5466 out:
5467         return status;
5468 }
5469
5470 /*
5471  * Decode RENAME response
5472  */
5473 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5474                                struct nfs_renameres *res)
5475 {
5476         struct compound_hdr hdr;
5477         int status;
5478
5479         status = decode_compound_hdr(xdr, &hdr);
5480         if (status)
5481                 goto out;
5482         status = decode_sequence(xdr, &res->seq_res, rqstp);
5483         if (status)
5484                 goto out;
5485         status = decode_putfh(xdr);
5486         if (status)
5487                 goto out;
5488         status = decode_savefh(xdr);
5489         if (status)
5490                 goto out;
5491         status = decode_putfh(xdr);
5492         if (status)
5493                 goto out;
5494         status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
5495         if (status)
5496                 goto out;
5497         /* Current FH is target directory */
5498         if (decode_getfattr(xdr, res->new_fattr, res->server,
5499                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5500                 goto out;
5501         status = decode_restorefh(xdr);
5502         if (status)
5503                 goto out;
5504         decode_getfattr(xdr, res->old_fattr, res->server,
5505                         !RPC_IS_ASYNC(rqstp->rq_task));
5506 out:
5507         return status;
5508 }
5509
5510 /*
5511  * Decode LINK response
5512  */
5513 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5514                              struct nfs4_link_res *res)
5515 {
5516         struct compound_hdr hdr;
5517         int status;
5518
5519         status = decode_compound_hdr(xdr, &hdr);
5520         if (status)
5521                 goto out;
5522         status = decode_sequence(xdr, &res->seq_res, rqstp);
5523         if (status)
5524                 goto out;
5525         status = decode_putfh(xdr);
5526         if (status)
5527                 goto out;
5528         status = decode_savefh(xdr);
5529         if (status)
5530                 goto out;
5531         status = decode_putfh(xdr);
5532         if (status)
5533                 goto out;
5534         status = decode_link(xdr, &res->cinfo);
5535         if (status)
5536                 goto out;
5537         /*
5538          * Note order: OP_LINK leaves the directory as the current
5539          *             filehandle.
5540          */
5541         if (decode_getfattr(xdr, res->dir_attr, res->server,
5542                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5543                 goto out;
5544         status = decode_restorefh(xdr);
5545         if (status)
5546                 goto out;
5547         decode_getfattr(xdr, res->fattr, res->server,
5548                         !RPC_IS_ASYNC(rqstp->rq_task));
5549 out:
5550         return status;
5551 }
5552
5553 /*
5554  * Decode CREATE response
5555  */
5556 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5557                                struct nfs4_create_res *res)
5558 {
5559         struct compound_hdr hdr;
5560         int status;
5561
5562         status = decode_compound_hdr(xdr, &hdr);
5563         if (status)
5564                 goto out;
5565         status = decode_sequence(xdr, &res->seq_res, rqstp);
5566         if (status)
5567                 goto out;
5568         status = decode_putfh(xdr);
5569         if (status)
5570                 goto out;
5571         status = decode_savefh(xdr);
5572         if (status)
5573                 goto out;
5574         status = decode_create(xdr, &res->dir_cinfo);
5575         if (status)
5576                 goto out;
5577         status = decode_getfh(xdr, res->fh);
5578         if (status)
5579                 goto out;
5580         if (decode_getfattr(xdr, res->fattr, res->server,
5581                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5582                 goto out;
5583         status = decode_restorefh(xdr);
5584         if (status)
5585                 goto out;
5586         decode_getfattr(xdr, res->dir_fattr, res->server,
5587                         !RPC_IS_ASYNC(rqstp->rq_task));
5588 out:
5589         return status;
5590 }
5591
5592 /*
5593  * Decode SYMLINK response
5594  */
5595 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5596                                 struct nfs4_create_res *res)
5597 {
5598         return nfs4_xdr_dec_create(rqstp, xdr, res);
5599 }
5600
5601 /*
5602  * Decode GETATTR response
5603  */
5604 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5605                                 struct nfs4_getattr_res *res)
5606 {
5607         struct compound_hdr hdr;
5608         int status;
5609
5610         status = decode_compound_hdr(xdr, &hdr);
5611         if (status)
5612                 goto out;
5613         status = decode_sequence(xdr, &res->seq_res, rqstp);
5614         if (status)
5615                 goto out;
5616         status = decode_putfh(xdr);
5617         if (status)
5618                 goto out;
5619         status = decode_getfattr(xdr, res->fattr, res->server,
5620                         !RPC_IS_ASYNC(rqstp->rq_task));
5621 out:
5622         return status;
5623 }
5624
5625 /*
5626  * Encode an SETACL request
5627  */
5628 static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
5629                                 struct nfs_setaclargs *args)
5630 {
5631         struct compound_hdr hdr = {
5632                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
5633         };
5634
5635         encode_compound_hdr(xdr, req, &hdr);
5636         encode_sequence(xdr, &args->seq_args, &hdr);
5637         encode_putfh(xdr, args->fh, &hdr);
5638         encode_setacl(xdr, args, &hdr);
5639         encode_nops(&hdr);
5640 }
5641
5642 /*
5643  * Decode SETACL response
5644  */
5645 static int
5646 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5647                     struct nfs_setaclres *res)
5648 {
5649         struct compound_hdr hdr;
5650         int status;
5651
5652         status = decode_compound_hdr(xdr, &hdr);
5653         if (status)
5654                 goto out;
5655         status = decode_sequence(xdr, &res->seq_res, rqstp);
5656         if (status)
5657                 goto out;
5658         status = decode_putfh(xdr);
5659         if (status)
5660                 goto out;
5661         status = decode_setattr(xdr);
5662 out:
5663         return status;
5664 }
5665
5666 /*
5667  * Decode GETACL response
5668  */
5669 static int
5670 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5671                     struct nfs_getaclres *res)
5672 {
5673         struct compound_hdr hdr;
5674         int status;
5675
5676         status = decode_compound_hdr(xdr, &hdr);
5677         if (status)
5678                 goto out;
5679         status = decode_sequence(xdr, &res->seq_res, rqstp);
5680         if (status)
5681                 goto out;
5682         status = decode_putfh(xdr);
5683         if (status)
5684                 goto out;
5685         status = decode_getacl(xdr, rqstp, &res->acl_len);
5686
5687 out:
5688         return status;
5689 }
5690
5691 /*
5692  * Decode CLOSE response
5693  */
5694 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5695                               struct nfs_closeres *res)
5696 {
5697         struct compound_hdr hdr;
5698         int status;
5699
5700         status = decode_compound_hdr(xdr, &hdr);
5701         if (status)
5702                 goto out;
5703         status = decode_sequence(xdr, &res->seq_res, rqstp);
5704         if (status)
5705                 goto out;
5706         status = decode_putfh(xdr);
5707         if (status)
5708                 goto out;
5709         status = decode_close(xdr, res);
5710         if (status != 0)
5711                 goto out;
5712         /*
5713          * Note: Server may do delete on close for this file
5714          *      in which case the getattr call will fail with
5715          *      an ESTALE error. Shouldn't be a problem,
5716          *      though, since fattr->valid will remain unset.
5717          */
5718         decode_getfattr(xdr, res->fattr, res->server,
5719                         !RPC_IS_ASYNC(rqstp->rq_task));
5720 out:
5721         return status;
5722 }
5723
5724 /*
5725  * Decode OPEN response
5726  */
5727 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5728                              struct nfs_openres *res)
5729 {
5730         struct compound_hdr hdr;
5731         int status;
5732
5733         status = decode_compound_hdr(xdr, &hdr);
5734         if (status)
5735                 goto out;
5736         status = decode_sequence(xdr, &res->seq_res, rqstp);
5737         if (status)
5738                 goto out;
5739         status = decode_putfh(xdr);
5740         if (status)
5741                 goto out;
5742         status = decode_savefh(xdr);
5743         if (status)
5744                 goto out;
5745         status = decode_open(xdr, res);
5746         if (status)
5747                 goto out;
5748         if (decode_getfh(xdr, &res->fh) != 0)
5749                 goto out;
5750         if (decode_getfattr(xdr, res->f_attr, res->server,
5751                                 !RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5752                 goto out;
5753         if (decode_restorefh(xdr) != 0)
5754                 goto out;
5755         decode_getfattr(xdr, res->dir_attr, res->server,
5756                         !RPC_IS_ASYNC(rqstp->rq_task));
5757 out:
5758         return status;
5759 }
5760
5761 /*
5762  * Decode OPEN_CONFIRM response
5763  */
5764 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
5765                                      struct xdr_stream *xdr,
5766                                      struct nfs_open_confirmres *res)
5767 {
5768         struct compound_hdr hdr;
5769         int status;
5770
5771         status = decode_compound_hdr(xdr, &hdr);
5772         if (status)
5773                 goto out;
5774         status = decode_putfh(xdr);
5775         if (status)
5776                 goto out;
5777         status = decode_open_confirm(xdr, res);
5778 out:
5779         return status;
5780 }
5781
5782 /*
5783  * Decode OPEN response
5784  */
5785 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
5786                                     struct xdr_stream *xdr,
5787                                     struct nfs_openres *res)
5788 {
5789         struct compound_hdr hdr;
5790         int status;
5791
5792         status = decode_compound_hdr(xdr, &hdr);
5793         if (status)
5794                 goto out;
5795         status = decode_sequence(xdr, &res->seq_res, rqstp);
5796         if (status)
5797                 goto out;
5798         status = decode_putfh(xdr);
5799         if (status)
5800                 goto out;
5801         status = decode_open(xdr, res);
5802         if (status)
5803                 goto out;
5804         decode_getfattr(xdr, res->f_attr, res->server,
5805                         !RPC_IS_ASYNC(rqstp->rq_task));
5806 out:
5807         return status;
5808 }
5809
5810 /*
5811  * Decode SETATTR response
5812  */
5813 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
5814                                 struct xdr_stream *xdr,
5815                                 struct nfs_setattrres *res)
5816 {
5817         struct compound_hdr hdr;
5818         int status;
5819
5820         status = decode_compound_hdr(xdr, &hdr);
5821         if (status)
5822                 goto out;
5823         status = decode_sequence(xdr, &res->seq_res, rqstp);
5824         if (status)
5825                 goto out;
5826         status = decode_putfh(xdr);
5827         if (status)
5828                 goto out;
5829         status = decode_setattr(xdr);
5830         if (status)
5831                 goto out;
5832         decode_getfattr(xdr, res->fattr, res->server,
5833                         !RPC_IS_ASYNC(rqstp->rq_task));
5834 out:
5835         return status;
5836 }
5837
5838 /*
5839  * Decode LOCK response
5840  */
5841 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5842                              struct nfs_lock_res *res)
5843 {
5844         struct compound_hdr hdr;
5845         int status;
5846
5847         status = decode_compound_hdr(xdr, &hdr);
5848         if (status)
5849                 goto out;
5850         status = decode_sequence(xdr, &res->seq_res, rqstp);
5851         if (status)
5852                 goto out;
5853         status = decode_putfh(xdr);
5854         if (status)
5855                 goto out;
5856         status = decode_lock(xdr, res);
5857 out:
5858         return status;
5859 }
5860
5861 /*
5862  * Decode LOCKT response
5863  */
5864 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5865                               struct nfs_lockt_res *res)
5866 {
5867         struct compound_hdr hdr;
5868         int status;
5869
5870         status = decode_compound_hdr(xdr, &hdr);
5871         if (status)
5872                 goto out;
5873         status = decode_sequence(xdr, &res->seq_res, rqstp);
5874         if (status)
5875                 goto out;
5876         status = decode_putfh(xdr);
5877         if (status)
5878                 goto out;
5879         status = decode_lockt(xdr, res);
5880 out:
5881         return status;
5882 }
5883
5884 /*
5885  * Decode LOCKU response
5886  */
5887 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5888                               struct nfs_locku_res *res)
5889 {
5890         struct compound_hdr hdr;
5891         int status;
5892
5893         status = decode_compound_hdr(xdr, &hdr);
5894         if (status)
5895                 goto out;
5896         status = decode_sequence(xdr, &res->seq_res, rqstp);
5897         if (status)
5898                 goto out;
5899         status = decode_putfh(xdr);
5900         if (status)
5901                 goto out;
5902         status = decode_locku(xdr, res);
5903 out:
5904         return status;
5905 }
5906
5907 static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
5908                                           struct xdr_stream *xdr, void *dummy)
5909 {
5910         struct compound_hdr hdr;
5911         int status;
5912
5913         status = decode_compound_hdr(xdr, &hdr);
5914         if (!status)
5915                 status = decode_release_lockowner(xdr);
5916         return status;
5917 }
5918
5919 /*
5920  * Decode READLINK response
5921  */
5922 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
5923                                  struct xdr_stream *xdr,
5924                                  struct nfs4_readlink_res *res)
5925 {
5926         struct compound_hdr hdr;
5927         int status;
5928
5929         status = decode_compound_hdr(xdr, &hdr);
5930         if (status)
5931                 goto out;
5932         status = decode_sequence(xdr, &res->seq_res, rqstp);
5933         if (status)
5934                 goto out;
5935         status = decode_putfh(xdr);
5936         if (status)
5937                 goto out;
5938         status = decode_readlink(xdr, rqstp);
5939 out:
5940         return status;
5941 }
5942
5943 /*
5944  * Decode READDIR response
5945  */
5946 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5947                                 struct nfs4_readdir_res *res)
5948 {
5949         struct compound_hdr hdr;
5950         int status;
5951
5952         status = decode_compound_hdr(xdr, &hdr);
5953         if (status)
5954                 goto out;
5955         status = decode_sequence(xdr, &res->seq_res, rqstp);
5956         if (status)
5957                 goto out;
5958         status = decode_putfh(xdr);
5959         if (status)
5960                 goto out;
5961         status = decode_readdir(xdr, rqstp, res);
5962 out:
5963         return status;
5964 }
5965
5966 /*
5967  * Decode Read response
5968  */
5969 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5970                              struct nfs_readres *res)
5971 {
5972         struct compound_hdr hdr;
5973         int status;
5974
5975         status = decode_compound_hdr(xdr, &hdr);
5976         if (status)
5977                 goto out;
5978         status = decode_sequence(xdr, &res->seq_res, rqstp);
5979         if (status)
5980                 goto out;
5981         status = decode_putfh(xdr);
5982         if (status)
5983                 goto out;
5984         status = decode_read(xdr, rqstp, res);
5985         if (!status)
5986                 status = res->count;
5987 out:
5988         return status;
5989 }
5990
5991 /*
5992  * Decode WRITE response
5993  */
5994 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5995                               struct nfs_writeres *res)
5996 {
5997         struct compound_hdr hdr;
5998         int status;
5999
6000         status = decode_compound_hdr(xdr, &hdr);
6001         if (status)
6002                 goto out;
6003         status = decode_sequence(xdr, &res->seq_res, rqstp);
6004         if (status)
6005                 goto out;
6006         status = decode_putfh(xdr);
6007         if (status)
6008                 goto out;
6009         status = decode_write(xdr, res);
6010         if (status)
6011                 goto out;
6012         if (res->fattr)
6013                 decode_getfattr(xdr, res->fattr, res->server,
6014                                 !RPC_IS_ASYNC(rqstp->rq_task));
6015         if (!status)
6016                 status = res->count;
6017 out:
6018         return status;
6019 }
6020
6021 /*
6022  * Decode COMMIT response
6023  */
6024 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6025                                struct nfs_writeres *res)
6026 {
6027         struct compound_hdr hdr;
6028         int status;
6029
6030         status = decode_compound_hdr(xdr, &hdr);
6031         if (status)
6032                 goto out;
6033         status = decode_sequence(xdr, &res->seq_res, rqstp);
6034         if (status)
6035                 goto out;
6036         status = decode_putfh(xdr);
6037         if (status)
6038                 goto out;
6039         status = decode_commit(xdr, res);
6040         if (status)
6041                 goto out;
6042         if (res->fattr)
6043                 decode_getfattr(xdr, res->fattr, res->server,
6044                                 !RPC_IS_ASYNC(rqstp->rq_task));
6045 out:
6046         return status;
6047 }
6048
6049 /*
6050  * Decode FSINFO response
6051  */
6052 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
6053                                struct nfs4_fsinfo_res *res)
6054 {
6055         struct compound_hdr hdr;
6056         int status;
6057
6058         status = decode_compound_hdr(xdr, &hdr);
6059         if (!status)
6060                 status = decode_sequence(xdr, &res->seq_res, req);
6061         if (!status)
6062                 status = decode_putfh(xdr);
6063         if (!status)
6064                 status = decode_fsinfo(xdr, res->fsinfo);
6065         return status;
6066 }
6067
6068 /*
6069  * Decode PATHCONF response
6070  */
6071 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
6072                                  struct nfs4_pathconf_res *res)
6073 {
6074         struct compound_hdr hdr;
6075         int status;
6076
6077         status = decode_compound_hdr(xdr, &hdr);
6078         if (!status)
6079                 status = decode_sequence(xdr, &res->seq_res, req);
6080         if (!status)
6081                 status = decode_putfh(xdr);
6082         if (!status)
6083                 status = decode_pathconf(xdr, res->pathconf);
6084         return status;
6085 }
6086
6087 /*
6088  * Decode STATFS response
6089  */
6090 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
6091                                struct nfs4_statfs_res *res)
6092 {
6093         struct compound_hdr hdr;
6094         int status;
6095
6096         status = decode_compound_hdr(xdr, &hdr);
6097         if (!status)
6098                 status = decode_sequence(xdr, &res->seq_res, req);
6099         if (!status)
6100                 status = decode_putfh(xdr);
6101         if (!status)
6102                 status = decode_statfs(xdr, res->fsstat);
6103         return status;
6104 }
6105
6106 /*
6107  * Decode GETATTR_BITMAP response
6108  */
6109 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
6110                                     struct xdr_stream *xdr,
6111                                     struct nfs4_server_caps_res *res)
6112 {
6113         struct compound_hdr hdr;
6114         int status;
6115
6116         status = decode_compound_hdr(xdr, &hdr);
6117         if (status)
6118                 goto out;
6119         status = decode_sequence(xdr, &res->seq_res, req);
6120         if (status)
6121                 goto out;
6122         status = decode_putfh(xdr);
6123         if (status)
6124                 goto out;
6125         status = decode_server_caps(xdr, res);
6126 out:
6127         return status;
6128 }
6129
6130 /*
6131  * Decode RENEW response
6132  */
6133 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6134                               void *__unused)
6135 {
6136         struct compound_hdr hdr;
6137         int status;
6138
6139         status = decode_compound_hdr(xdr, &hdr);
6140         if (!status)
6141                 status = decode_renew(xdr);
6142         return status;
6143 }
6144
6145 /*
6146  * Decode SETCLIENTID response
6147  */
6148 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
6149                                     struct xdr_stream *xdr,
6150                                     struct nfs4_setclientid_res *res)
6151 {
6152         struct compound_hdr hdr;
6153         int status;
6154
6155         status = decode_compound_hdr(xdr, &hdr);
6156         if (!status)
6157                 status = decode_setclientid(xdr, res);
6158         return status;
6159 }
6160
6161 /*
6162  * Decode SETCLIENTID_CONFIRM response
6163  */
6164 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
6165                                             struct xdr_stream *xdr,
6166                                             struct nfs_fsinfo *fsinfo)
6167 {
6168         struct compound_hdr hdr;
6169         int status;
6170
6171         status = decode_compound_hdr(xdr, &hdr);
6172         if (!status)
6173                 status = decode_setclientid_confirm(xdr);
6174         if (!status)
6175                 status = decode_putrootfh(xdr);
6176         if (!status)
6177                 status = decode_fsinfo(xdr, fsinfo);
6178         return status;
6179 }
6180
6181 /*
6182  * Decode DELEGRETURN response
6183  */
6184 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
6185                                     struct xdr_stream *xdr,
6186                                     struct nfs4_delegreturnres *res)
6187 {
6188         struct compound_hdr hdr;
6189         int status;
6190
6191         status = decode_compound_hdr(xdr, &hdr);
6192         if (status)
6193                 goto out;
6194         status = decode_sequence(xdr, &res->seq_res, rqstp);
6195         if (status)
6196                 goto out;
6197         status = decode_putfh(xdr);
6198         if (status != 0)
6199                 goto out;
6200         status = decode_delegreturn(xdr);
6201         if (status != 0)
6202                 goto out;
6203         decode_getfattr(xdr, res->fattr, res->server,
6204                         !RPC_IS_ASYNC(rqstp->rq_task));
6205 out:
6206         return status;
6207 }
6208
6209 /*
6210  * Decode FS_LOCATIONS response
6211  */
6212 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
6213                                      struct xdr_stream *xdr,
6214                                      struct nfs4_fs_locations_res *res)
6215 {
6216         struct compound_hdr hdr;
6217         int status;
6218
6219         status = decode_compound_hdr(xdr, &hdr);
6220         if (status)
6221                 goto out;
6222         status = decode_sequence(xdr, &res->seq_res, req);
6223         if (status)
6224                 goto out;
6225         status = decode_putfh(xdr);
6226         if (status)
6227                 goto out;
6228         status = decode_lookup(xdr);
6229         if (status)
6230                 goto out;
6231         xdr_enter_page(xdr, PAGE_SIZE);
6232         status = decode_getfattr(xdr, &res->fs_locations->fattr,
6233                                  res->fs_locations->server,
6234                                  !RPC_IS_ASYNC(req->rq_task));
6235 out:
6236         return status;
6237 }
6238
6239 /*
6240  * Decode SECINFO response
6241  */
6242 static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
6243                                 struct xdr_stream *xdr,
6244                                 struct nfs4_secinfo_res *res)
6245 {
6246         struct compound_hdr hdr;
6247         int status;
6248
6249         status = decode_compound_hdr(xdr, &hdr);
6250         if (status)
6251                 goto out;
6252         status = decode_sequence(xdr, &res->seq_res, rqstp);
6253         if (status)
6254                 goto out;
6255         status = decode_putfh(xdr);
6256         if (status)
6257                 goto out;
6258         status = decode_secinfo(xdr, res);
6259         if (status)
6260                 goto out;
6261 out:
6262         return status;
6263 }
6264
6265 #if defined(CONFIG_NFS_V4_1)
6266 /*
6267  * Decode EXCHANGE_ID response
6268  */
6269 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
6270                                     struct xdr_stream *xdr,
6271                                     void *res)
6272 {
6273         struct compound_hdr hdr;
6274         int status;
6275
6276         status = decode_compound_hdr(xdr, &hdr);
6277         if (!status)
6278                 status = decode_exchange_id(xdr, res);
6279         return status;
6280 }
6281
6282 /*
6283  * Decode CREATE_SESSION response
6284  */
6285 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
6286                                        struct xdr_stream *xdr,
6287                                        struct nfs41_create_session_res *res)
6288 {
6289         struct compound_hdr hdr;
6290         int status;
6291
6292         status = decode_compound_hdr(xdr, &hdr);
6293         if (!status)
6294                 status = decode_create_session(xdr, res);
6295         return status;
6296 }
6297
6298 /*
6299  * Decode DESTROY_SESSION response
6300  */
6301 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
6302                                         struct xdr_stream *xdr,
6303                                         void *res)
6304 {
6305         struct compound_hdr hdr;
6306         int status;
6307
6308         status = decode_compound_hdr(xdr, &hdr);
6309         if (!status)
6310                 status = decode_destroy_session(xdr, res);
6311         return status;
6312 }
6313
6314 /*
6315  * Decode SEQUENCE response
6316  */
6317 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
6318                                  struct xdr_stream *xdr,
6319                                  struct nfs4_sequence_res *res)
6320 {
6321         struct compound_hdr hdr;
6322         int status;
6323
6324         status = decode_compound_hdr(xdr, &hdr);
6325         if (!status)
6326                 status = decode_sequence(xdr, res, rqstp);
6327         return status;
6328 }
6329
6330 /*
6331  * Decode GET_LEASE_TIME response
6332  */
6333 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
6334                                        struct xdr_stream *xdr,
6335                                        struct nfs4_get_lease_time_res *res)
6336 {
6337         struct compound_hdr hdr;
6338         int status;
6339
6340         status = decode_compound_hdr(xdr, &hdr);
6341         if (!status)
6342                 status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
6343         if (!status)
6344                 status = decode_putrootfh(xdr);
6345         if (!status)
6346                 status = decode_fsinfo(xdr, res->lr_fsinfo);
6347         return status;
6348 }
6349
6350 /*
6351  * Decode RECLAIM_COMPLETE response
6352  */
6353 static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
6354                                          struct xdr_stream *xdr,
6355                                          struct nfs41_reclaim_complete_res *res)
6356 {
6357         struct compound_hdr hdr;
6358         int status;
6359
6360         status = decode_compound_hdr(xdr, &hdr);
6361         if (!status)
6362                 status = decode_sequence(xdr, &res->seq_res, rqstp);
6363         if (!status)
6364                 status = decode_reclaim_complete(xdr, (void *)NULL);
6365         return status;
6366 }
6367
6368 /*
6369  * Decode GETDEVINFO response
6370  */
6371 static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
6372                                       struct xdr_stream *xdr,
6373                                       struct nfs4_getdeviceinfo_res *res)
6374 {
6375         struct compound_hdr hdr;
6376         int status;
6377
6378         status = decode_compound_hdr(xdr, &hdr);
6379         if (status != 0)
6380                 goto out;
6381         status = decode_sequence(xdr, &res->seq_res, rqstp);
6382         if (status != 0)
6383                 goto out;
6384         status = decode_getdeviceinfo(xdr, res->pdev);
6385 out:
6386         return status;
6387 }
6388
6389 /*
6390  * Decode LAYOUTGET response
6391  */
6392 static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
6393                                   struct xdr_stream *xdr,
6394                                   struct nfs4_layoutget_res *res)
6395 {
6396         struct compound_hdr hdr;
6397         int status;
6398
6399         status = decode_compound_hdr(xdr, &hdr);
6400         if (status)
6401                 goto out;
6402         status = decode_sequence(xdr, &res->seq_res, rqstp);
6403         if (status)
6404                 goto out;
6405         status = decode_putfh(xdr);
6406         if (status)
6407                 goto out;
6408         status = decode_layoutget(xdr, rqstp, res);
6409 out:
6410         return status;
6411 }
6412
6413 /*
6414  * Decode LAYOUTRETURN response
6415  */
6416 static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
6417                                      struct xdr_stream *xdr,
6418                                      struct nfs4_layoutreturn_res *res)
6419 {
6420         struct compound_hdr hdr;
6421         int status;
6422
6423         status = decode_compound_hdr(xdr, &hdr);
6424         if (status)
6425                 goto out;
6426         status = decode_sequence(xdr, &res->seq_res, rqstp);
6427         if (status)
6428                 goto out;
6429         status = decode_putfh(xdr);
6430         if (status)
6431                 goto out;
6432         status = decode_layoutreturn(xdr, res);
6433 out:
6434         return status;
6435 }
6436
6437 /*
6438  * Decode LAYOUTCOMMIT response
6439  */
6440 static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
6441                                      struct xdr_stream *xdr,
6442                                      struct nfs4_layoutcommit_res *res)
6443 {
6444         struct compound_hdr hdr;
6445         int status;
6446
6447         status = decode_compound_hdr(xdr, &hdr);
6448         if (status)
6449                 goto out;
6450         status = decode_sequence(xdr, &res->seq_res, rqstp);
6451         if (status)
6452                 goto out;
6453         status = decode_putfh(xdr);
6454         if (status)
6455                 goto out;
6456         status = decode_layoutcommit(xdr, rqstp, res);
6457         if (status)
6458                 goto out;
6459         decode_getfattr(xdr, res->fattr, res->server,
6460                         !RPC_IS_ASYNC(rqstp->rq_task));
6461 out:
6462         return status;
6463 }
6464 #endif /* CONFIG_NFS_V4_1 */
6465
6466 /**
6467  * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
6468  *                      the local page cache.
6469  * @xdr: XDR stream where entry resides
6470  * @entry: buffer to fill in with entry data
6471  * @plus: boolean indicating whether this should be a readdirplus entry
6472  *
6473  * Returns zero if successful, otherwise a negative errno value is
6474  * returned.
6475  *
6476  * This function is not invoked during READDIR reply decoding, but
6477  * rather whenever an application invokes the getdents(2) system call
6478  * on a directory already in our cache.
6479  */
6480 int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
6481                        int plus)
6482 {
6483         uint32_t bitmap[2] = {0};
6484         uint32_t len;
6485         __be32 *p = xdr_inline_decode(xdr, 4);
6486         if (unlikely(!p))
6487                 goto out_overflow;
6488         if (*p == xdr_zero) {
6489                 p = xdr_inline_decode(xdr, 4);
6490                 if (unlikely(!p))
6491                         goto out_overflow;
6492                 if (*p == xdr_zero)
6493                         return -EAGAIN;
6494                 entry->eof = 1;
6495                 return -EBADCOOKIE;
6496         }
6497
6498         p = xdr_inline_decode(xdr, 12);
6499         if (unlikely(!p))
6500                 goto out_overflow;
6501         entry->prev_cookie = entry->cookie;
6502         p = xdr_decode_hyper(p, &entry->cookie);
6503         entry->len = be32_to_cpup(p);
6504
6505         p = xdr_inline_decode(xdr, entry->len);
6506         if (unlikely(!p))
6507                 goto out_overflow;
6508         entry->name = (const char *) p;
6509
6510         /*
6511          * In case the server doesn't return an inode number,
6512          * we fake one here.  (We don't use inode number 0,
6513          * since glibc seems to choke on it...)
6514          */
6515         entry->ino = 1;
6516         entry->fattr->valid = 0;
6517
6518         if (decode_attr_bitmap(xdr, bitmap) < 0)
6519                 goto out_overflow;
6520
6521         if (decode_attr_length(xdr, &len, &p) < 0)
6522                 goto out_overflow;
6523
6524         if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
6525                                         entry->server, 1) < 0)
6526                 goto out_overflow;
6527         if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
6528                 entry->ino = entry->fattr->mounted_on_fileid;
6529         else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
6530                 entry->ino = entry->fattr->fileid;
6531
6532         entry->d_type = DT_UNKNOWN;
6533         if (entry->fattr->valid & NFS_ATTR_FATTR_TYPE)
6534                 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
6535
6536         return 0;
6537
6538 out_overflow:
6539         print_overflow_msg(__func__, xdr);
6540         return -EAGAIN;
6541 }
6542
6543 /*
6544  * We need to translate between nfs status return values and
6545  * the local errno values which may not be the same.
6546  */
6547 static struct {
6548         int stat;
6549         int errno;
6550 } nfs_errtbl[] = {
6551         { NFS4_OK,              0               },
6552         { NFS4ERR_PERM,         -EPERM          },
6553         { NFS4ERR_NOENT,        -ENOENT         },
6554         { NFS4ERR_IO,           -errno_NFSERR_IO},
6555         { NFS4ERR_NXIO,         -ENXIO          },
6556         { NFS4ERR_ACCESS,       -EACCES         },
6557         { NFS4ERR_EXIST,        -EEXIST         },
6558         { NFS4ERR_XDEV,         -EXDEV          },
6559         { NFS4ERR_NOTDIR,       -ENOTDIR        },
6560         { NFS4ERR_ISDIR,        -EISDIR         },
6561         { NFS4ERR_INVAL,        -EINVAL         },
6562         { NFS4ERR_FBIG,         -EFBIG          },
6563         { NFS4ERR_NOSPC,        -ENOSPC         },
6564         { NFS4ERR_ROFS,         -EROFS          },
6565         { NFS4ERR_MLINK,        -EMLINK         },
6566         { NFS4ERR_NAMETOOLONG,  -ENAMETOOLONG   },
6567         { NFS4ERR_NOTEMPTY,     -ENOTEMPTY      },
6568         { NFS4ERR_DQUOT,        -EDQUOT         },
6569         { NFS4ERR_STALE,        -ESTALE         },
6570         { NFS4ERR_BADHANDLE,    -EBADHANDLE     },
6571         { NFS4ERR_BAD_COOKIE,   -EBADCOOKIE     },
6572         { NFS4ERR_NOTSUPP,      -ENOTSUPP       },
6573         { NFS4ERR_TOOSMALL,     -ETOOSMALL      },
6574         { NFS4ERR_SERVERFAULT,  -EREMOTEIO      },
6575         { NFS4ERR_BADTYPE,      -EBADTYPE       },
6576         { NFS4ERR_LOCKED,       -EAGAIN         },
6577         { NFS4ERR_SYMLINK,      -ELOOP          },
6578         { NFS4ERR_OP_ILLEGAL,   -EOPNOTSUPP     },
6579         { NFS4ERR_DEADLOCK,     -EDEADLK        },
6580         { -1,                   -EIO            }
6581 };
6582
6583 /*
6584  * Convert an NFS error code to a local one.
6585  * This one is used jointly by NFSv2 and NFSv3.
6586  */
6587 static int
6588 nfs4_stat_to_errno(int stat)
6589 {
6590         int i;
6591         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
6592                 if (nfs_errtbl[i].stat == stat)
6593                         return nfs_errtbl[i].errno;
6594         }
6595         if (stat <= 10000 || stat > 10100) {
6596                 /* The server is looney tunes. */
6597                 return -EREMOTEIO;
6598         }
6599         /* If we cannot translate the error, the recovery routines should
6600          * handle it.
6601          * Note: remaining NFSv4 error codes have values > 10000, so should
6602          * not conflict with native Linux error codes.
6603          */
6604         return -stat;
6605 }
6606
6607 #define PROC(proc, argtype, restype)                            \
6608 [NFSPROC4_CLNT_##proc] = {                                      \
6609         .p_proc   = NFSPROC4_COMPOUND,                          \
6610         .p_encode = (kxdreproc_t)nfs4_xdr_##argtype,            \
6611         .p_decode = (kxdrdproc_t)nfs4_xdr_##restype,            \
6612         .p_arglen = NFS4_##argtype##_sz,                        \
6613         .p_replen = NFS4_##restype##_sz,                        \
6614         .p_statidx = NFSPROC4_CLNT_##proc,                      \
6615         .p_name   = #proc,                                      \
6616 }
6617
6618 struct rpc_procinfo     nfs4_procedures[] = {
6619         PROC(READ,              enc_read,               dec_read),
6620         PROC(WRITE,             enc_write,              dec_write),
6621         PROC(COMMIT,            enc_commit,             dec_commit),
6622         PROC(OPEN,              enc_open,               dec_open),
6623         PROC(OPEN_CONFIRM,      enc_open_confirm,       dec_open_confirm),
6624         PROC(OPEN_NOATTR,       enc_open_noattr,        dec_open_noattr),
6625         PROC(OPEN_DOWNGRADE,    enc_open_downgrade,     dec_open_downgrade),
6626         PROC(CLOSE,             enc_close,              dec_close),
6627         PROC(SETATTR,           enc_setattr,            dec_setattr),
6628         PROC(FSINFO,            enc_fsinfo,             dec_fsinfo),
6629         PROC(RENEW,             enc_renew,              dec_renew),
6630         PROC(SETCLIENTID,       enc_setclientid,        dec_setclientid),
6631         PROC(SETCLIENTID_CONFIRM, enc_setclientid_confirm, dec_setclientid_confirm),
6632         PROC(LOCK,              enc_lock,               dec_lock),
6633         PROC(LOCKT,             enc_lockt,              dec_lockt),
6634         PROC(LOCKU,             enc_locku,              dec_locku),
6635         PROC(ACCESS,            enc_access,             dec_access),
6636         PROC(GETATTR,           enc_getattr,            dec_getattr),
6637         PROC(LOOKUP,            enc_lookup,             dec_lookup),
6638         PROC(LOOKUP_ROOT,       enc_lookup_root,        dec_lookup_root),
6639         PROC(REMOVE,            enc_remove,             dec_remove),
6640         PROC(RENAME,            enc_rename,             dec_rename),
6641         PROC(LINK,              enc_link,               dec_link),
6642         PROC(SYMLINK,           enc_symlink,            dec_symlink),
6643         PROC(CREATE,            enc_create,             dec_create),
6644         PROC(PATHCONF,          enc_pathconf,           dec_pathconf),
6645         PROC(STATFS,            enc_statfs,             dec_statfs),
6646         PROC(READLINK,          enc_readlink,           dec_readlink),
6647         PROC(READDIR,           enc_readdir,            dec_readdir),
6648         PROC(SERVER_CAPS,       enc_server_caps,        dec_server_caps),
6649         PROC(DELEGRETURN,       enc_delegreturn,        dec_delegreturn),
6650         PROC(GETACL,            enc_getacl,             dec_getacl),
6651         PROC(SETACL,            enc_setacl,             dec_setacl),
6652         PROC(FS_LOCATIONS,      enc_fs_locations,       dec_fs_locations),
6653         PROC(RELEASE_LOCKOWNER, enc_release_lockowner,  dec_release_lockowner),
6654         PROC(SECINFO,           enc_secinfo,            dec_secinfo),
6655 #if defined(CONFIG_NFS_V4_1)
6656         PROC(EXCHANGE_ID,       enc_exchange_id,        dec_exchange_id),
6657         PROC(CREATE_SESSION,    enc_create_session,     dec_create_session),
6658         PROC(DESTROY_SESSION,   enc_destroy_session,    dec_destroy_session),
6659         PROC(SEQUENCE,          enc_sequence,           dec_sequence),
6660         PROC(GET_LEASE_TIME,    enc_get_lease_time,     dec_get_lease_time),
6661         PROC(RECLAIM_COMPLETE,  enc_reclaim_complete,   dec_reclaim_complete),
6662         PROC(GETDEVICEINFO,     enc_getdeviceinfo,      dec_getdeviceinfo),
6663         PROC(LAYOUTGET,         enc_layoutget,          dec_layoutget),
6664         PROC(LAYOUTCOMMIT,      enc_layoutcommit,       dec_layoutcommit),
6665         PROC(LAYOUTRETURN,      enc_layoutreturn,       dec_layoutreturn),
6666 #endif /* CONFIG_NFS_V4_1 */
6667 };
6668
6669 struct rpc_version              nfs_version4 = {
6670         .number                 = 4,
6671         .nrprocs                = ARRAY_SIZE(nfs4_procedures),
6672         .procs                  = nfs4_procedures
6673 };
6674
6675 /*
6676  * Local variables:
6677  *  c-basic-offset: 8
6678  * End:
6679  */