/*
 *  fs/nfs/nfs4xdr.c
 *
 *  Client-side XDR for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_idmap.h>
#include "nfs4_fs.h"
#include "internal.h"

#define NFSDBG_FACILITY         NFSDBG_XDR

/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO         EIO

static int nfs4_stat_to_errno(int);

/* NFSv4 COMPOUND tags are only wanted for debugging purposes */
#ifdef DEBUG
#define NFS4_MAXTAGLEN          20
#else
#define NFS4_MAXTAGLEN          0
#endif

/* lock,open owner id:
 * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
 */
#define open_owner_id_maxsz     (1 + 4)
#define lock_owner_id_maxsz     (1 + 4)
#define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
#define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
#define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
#define op_encode_hdr_maxsz     (1)
#define op_decode_hdr_maxsz     (2)
#define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
#define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
#define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
#define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
#define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
                                (NFS4_FHSIZE >> 2))
#define decode_putfh_maxsz      (op_decode_hdr_maxsz)
#define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
#define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
#define encode_getfh_maxsz      (op_encode_hdr_maxsz)
#define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
                                ((3+NFS4_FHSIZE) >> 2))
#define nfs4_fattr_bitmap_maxsz 3
#define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
#define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
#define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
#define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
#define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
/* This is based on getfattr, which uses the most attributes: */
#define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
                                3 + 3 + 3 + nfs4_owner_maxsz + nfs4_group_maxsz))
#define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
                                nfs4_fattr_value_maxsz)
#define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
#define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
                                 1 + 2 + 1 + \
                                nfs4_owner_maxsz + \
                                nfs4_group_maxsz + \
                                4 + 4)
#define encode_savefh_maxsz     (op_encode_hdr_maxsz)
#define decode_savefh_maxsz     (op_decode_hdr_maxsz)
#define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
#define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
#define encode_fsinfo_maxsz     (encode_getattr_maxsz)
#define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + 11)
#define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
#define decode_renew_maxsz      (op_decode_hdr_maxsz)
#define encode_setclientid_maxsz \
                                (op_encode_hdr_maxsz + \
                                XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
                                XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
                                1 /* sc_prog */ + \
                                XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
                                XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
                                1) /* sc_cb_ident */
#define decode_setclientid_maxsz \
                                (op_decode_hdr_maxsz + \
                                2 + \
                                1024) /* large value for CLID_INUSE */
#define encode_setclientid_confirm_maxsz \
                                (op_encode_hdr_maxsz + \
                                3 + (NFS4_VERIFIER_SIZE >> 2))
#define decode_setclientid_confirm_maxsz \
                                (op_decode_hdr_maxsz)
#define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
#define decode_lookup_maxsz     (op_decode_hdr_maxsz)
#define encode_share_access_maxsz \
                                (2)
#define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
#define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
#define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
#define encode_open_maxsz       (op_encode_hdr_maxsz + \
                                2 + encode_share_access_maxsz + 2 + \
                                open_owner_id_maxsz + \
                                encode_opentype_maxsz + \
                                encode_claim_null_maxsz)
#define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
#define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
                                decode_ace_maxsz)
#define decode_change_info_maxsz        (5)
#define decode_open_maxsz       (op_decode_hdr_maxsz + \
                                decode_stateid_maxsz + \
                                decode_change_info_maxsz + 1 + \
                                nfs4_fattr_bitmap_maxsz + \
                                decode_delegation_maxsz)
#define encode_open_confirm_maxsz \
                                (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + 1)
#define decode_open_confirm_maxsz \
                                (op_decode_hdr_maxsz + \
                                 decode_stateid_maxsz)
#define encode_open_downgrade_maxsz \
                                (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + 1 + \
                                 encode_share_access_maxsz)
#define decode_open_downgrade_maxsz \
                                (op_decode_hdr_maxsz + \
                                 decode_stateid_maxsz)
#define encode_close_maxsz      (op_encode_hdr_maxsz + \
                                 1 + encode_stateid_maxsz)
#define decode_close_maxsz      (op_decode_hdr_maxsz + \
                                 decode_stateid_maxsz)
#define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + \
                                 encode_attrs_maxsz)
#define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
                                 nfs4_fattr_bitmap_maxsz)
#define encode_read_maxsz       (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + 3)
#define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
#define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
                                 2 + encode_verifier_maxsz + 5)
#define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
                                 decode_verifier_maxsz)
#define encode_readlink_maxsz   (op_encode_hdr_maxsz)
#define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
#define encode_write_maxsz      (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + 4)
#define decode_write_maxsz      (op_decode_hdr_maxsz + \
                                 2 + decode_verifier_maxsz)
#define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
#define decode_commit_maxsz     (op_decode_hdr_maxsz + \
                                 decode_verifier_maxsz)
#define encode_remove_maxsz     (op_encode_hdr_maxsz + \
                                nfs4_name_maxsz)
#define decode_remove_maxsz     (op_decode_hdr_maxsz + \
                                 decode_change_info_maxsz)
#define encode_rename_maxsz     (op_encode_hdr_maxsz + \
                                2 * nfs4_name_maxsz)
#define decode_rename_maxsz     (op_decode_hdr_maxsz + \
                                 decode_change_info_maxsz + \
                                 decode_change_info_maxsz)
#define encode_link_maxsz       (op_encode_hdr_maxsz + \
                                nfs4_name_maxsz)
#define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
#define encode_lock_maxsz       (op_encode_hdr_maxsz + \
                                 7 + \
                                 1 + encode_stateid_maxsz + 8)
#define decode_lock_denied_maxsz \
                                (8 + decode_lockowner_maxsz)
#define decode_lock_maxsz       (op_decode_hdr_maxsz + \
                                 decode_lock_denied_maxsz)
#define encode_lockt_maxsz      (op_encode_hdr_maxsz + 12)
#define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
                                 decode_lock_denied_maxsz)
#define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
                                 encode_stateid_maxsz + \
                                 4)
#define decode_locku_maxsz      (op_decode_hdr_maxsz + \
                                 decode_stateid_maxsz)
#define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
#define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
#define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
                                1 + nfs4_name_maxsz + \
                                1 + \
                                nfs4_fattr_maxsz)
#define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
#define encode_create_maxsz     (op_encode_hdr_maxsz + \
                                1 + 2 + nfs4_name_maxsz + \
                                encode_attrs_maxsz)
#define decode_create_maxsz     (op_decode_hdr_maxsz + \
                                decode_change_info_maxsz + \
                                nfs4_fattr_bitmap_maxsz)
#define encode_statfs_maxsz     (encode_getattr_maxsz)
#define decode_statfs_maxsz     (decode_getattr_maxsz)
#define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
#define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
#define encode_getacl_maxsz     (encode_getattr_maxsz)
#define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
                                 nfs4_fattr_bitmap_maxsz + 1)
#define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + 3)
#define decode_setacl_maxsz     (decode_setattr_maxsz)
#define encode_fs_locations_maxsz \
                                (encode_getattr_maxsz)
#define decode_fs_locations_maxsz \
                                (0)

#if defined(CONFIG_NFS_V4_1)
#define NFS4_MAX_MACHINE_NAME_LEN (64)

#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
                                encode_verifier_maxsz + \
                                1 /* co_ownerid.len */ + \
                                XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
                                1 /* flags */ + \
                                1 /* spa_how */ + \
                                0 /* SP4_NONE (for now) */ + \
                                1 /* zero implemetation id array */)
#define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
                                2 /* eir_clientid */ + \
                                1 /* eir_sequenceid */ + \
                                1 /* eir_flags */ + \
                                1 /* spr_how */ + \
                                0 /* SP4_NONE (for now) */ + \
                                2 /* eir_server_owner.so_minor_id */ + \
                                /* eir_server_owner.so_major_id<> */ \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
                                /* eir_server_scope<> */ \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
                                1 /* eir_server_impl_id array length */ + \
                                0 /* ignored eir_server_impl_id contents */)
#define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
#define decode_channel_attrs_maxsz  (6 + \
                                     1 /* ca_rdma_ird.len */ + \
                                     1 /* ca_rdma_ird */)
#define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
                                     2 /* csa_clientid */ + \
                                     1 /* csa_sequence */ + \
                                     1 /* csa_flags */ + \
                                     encode_channel_attrs_maxsz + \
                                     encode_channel_attrs_maxsz + \
                                     1 /* csa_cb_program */ + \
                                     1 /* csa_sec_parms.len (1) */ + \
                                     1 /* cb_secflavor (AUTH_SYS) */ + \
                                     1 /* stamp */ + \
                                     1 /* machinename.len */ + \
                                     XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
                                     1 /* uid */ + \
                                     1 /* gid */ + \
                                     1 /* gids.len (0) */)
#define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
                                     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
                                     1 /* csr_sequence */ + \
                                     1 /* csr_flags */ + \
                                     decode_channel_attrs_maxsz + \
                                     decode_channel_attrs_maxsz)
#define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
#define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
#define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
                                XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
#define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
                                XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
#define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
#define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
#else /* CONFIG_NFS_V4_1 */
#define encode_sequence_maxsz   0
#define decode_sequence_maxsz   0
#endif /* CONFIG_NFS_V4_1 */

#define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
#define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
#define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_read_maxsz)
#define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_read_maxsz)
#define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_readlink_maxsz)
#define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_readlink_maxsz)
#define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_readdir_maxsz)
#define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_readdir_maxsz)
#define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_write_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_write_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_commit_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_commit_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_savefh_maxsz + \
                                encode_open_maxsz + \
                                encode_getfh_maxsz + \
                                encode_getattr_maxsz + \
                                encode_restorefh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_savefh_maxsz + \
                                decode_open_maxsz + \
                                decode_getfh_maxsz + \
                                decode_getattr_maxsz + \
                                decode_restorefh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_open_confirm_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_open_confirm_maxsz)
#define NFS4_dec_open_confirm_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_open_confirm_maxsz)
#define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
                                        encode_sequence_maxsz + \
                                        encode_putfh_maxsz + \
                                        encode_open_maxsz + \
                                        encode_getattr_maxsz)
#define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
                                        decode_sequence_maxsz + \
                                        decode_putfh_maxsz + \
                                        decode_open_maxsz + \
                                        decode_getattr_maxsz)
#define NFS4_enc_open_downgrade_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_open_downgrade_maxsz + \
                                 encode_getattr_maxsz)
#define NFS4_dec_open_downgrade_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_open_downgrade_maxsz + \
                                 decode_getattr_maxsz)
#define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_close_maxsz + \
                                 encode_getattr_maxsz)
#define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_close_maxsz + \
                                 decode_getattr_maxsz)
#define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_setattr_maxsz + \
                                 encode_getattr_maxsz)
#define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_setattr_maxsz + \
                                 decode_getattr_maxsz)
#define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_fsinfo_maxsz)
#define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_fsinfo_maxsz)
#define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
                                encode_renew_maxsz)
#define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
                                decode_renew_maxsz)
#define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
                                encode_setclientid_maxsz)
#define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
                                decode_setclientid_maxsz)
#define NFS4_enc_setclientid_confirm_sz \
                                (compound_encode_hdr_maxsz + \
                                encode_setclientid_confirm_maxsz + \
                                encode_putrootfh_maxsz + \
                                encode_fsinfo_maxsz)
#define NFS4_dec_setclientid_confirm_sz \
                                (compound_decode_hdr_maxsz + \
                                decode_setclientid_confirm_maxsz + \
                                decode_putrootfh_maxsz + \
                                decode_fsinfo_maxsz)
#define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_lock_maxsz)
#define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_lock_maxsz)
#define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_lockt_maxsz)
#define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_lockt_maxsz)
#define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_locku_maxsz)
#define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_locku_maxsz)
#define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_access_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_access_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_lookup_maxsz + \
                                encode_getattr_maxsz + \
                                encode_getfh_maxsz)
#define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_lookup_maxsz + \
                                decode_getattr_maxsz + \
                                decode_getfh_maxsz)
#define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putrootfh_maxsz + \
                                encode_getattr_maxsz + \
                                encode_getfh_maxsz)
#define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putrootfh_maxsz + \
                                decode_getattr_maxsz + \
                                decode_getfh_maxsz)
#define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_remove_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_remove_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_savefh_maxsz + \
                                encode_putfh_maxsz + \
                                encode_rename_maxsz + \
                                encode_getattr_maxsz + \
                                encode_restorefh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_savefh_maxsz + \
                                decode_putfh_maxsz + \
                                decode_rename_maxsz + \
                                decode_getattr_maxsz + \
                                decode_restorefh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_savefh_maxsz + \
                                encode_putfh_maxsz + \
                                encode_link_maxsz + \
                                decode_getattr_maxsz + \
                                encode_restorefh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_savefh_maxsz + \
                                decode_putfh_maxsz + \
                                decode_link_maxsz + \
                                decode_getattr_maxsz + \
                                decode_restorefh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_symlink_maxsz + \
                                encode_getattr_maxsz + \
                                encode_getfh_maxsz)
#define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_symlink_maxsz + \
                                decode_getattr_maxsz + \
                                decode_getfh_maxsz)
#define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_savefh_maxsz + \
                                encode_create_maxsz + \
                                encode_getfh_maxsz + \
                                encode_getattr_maxsz + \
                                encode_restorefh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_savefh_maxsz + \
                                decode_create_maxsz + \
                                decode_getfh_maxsz + \
                                decode_getattr_maxsz + \
                                decode_restorefh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_statfs_maxsz)
#define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_statfs_maxsz)
#define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_delegreturn_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_delegreturn_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_getacl_maxsz)
#define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_getacl_maxsz)
#define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_setacl_maxsz)
#define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_setacl_maxsz)
#define NFS4_enc_fs_locations_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_lookup_maxsz + \
                                 encode_fs_locations_maxsz)
#define NFS4_dec_fs_locations_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_lookup_maxsz + \
                                 decode_fs_locations_maxsz)
#if defined(CONFIG_NFS_V4_1)
#define NFS4_enc_exchange_id_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_exchange_id_maxsz)
#define NFS4_dec_exchange_id_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_exchange_id_maxsz)
#define NFS4_enc_create_session_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_create_session_maxsz)
#define NFS4_dec_create_session_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_create_session_maxsz)
#define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
                                         encode_destroy_session_maxsz)
#define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
                                         decode_destroy_session_maxsz)
#define NFS4_enc_sequence_sz \
                                (compound_decode_hdr_maxsz + \
                                 encode_sequence_maxsz)
#define NFS4_dec_sequence_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz)
#define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
                                         encode_sequence_maxsz + \
                                         encode_putrootfh_maxsz + \
                                         encode_fsinfo_maxsz)
#define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
                                         decode_sequence_maxsz + \
                                         decode_putrootfh_maxsz + \
                                         decode_fsinfo_maxsz)
#define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
                                         encode_sequence_maxsz + \
                                         encode_reclaim_complete_maxsz)
#define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
                                         decode_sequence_maxsz + \
                                         decode_reclaim_complete_maxsz)

const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
                                      compound_encode_hdr_maxsz +
                                      encode_sequence_maxsz +
                                      encode_putfh_maxsz +
                                      encode_getattr_maxsz) *
                                     XDR_UNIT);

const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
                                     compound_decode_hdr_maxsz +
                                     decode_sequence_maxsz +
                                     decode_putfh_maxsz) *
                                    XDR_UNIT);
#endif /* CONFIG_NFS_V4_1 */

static const umode_t nfs_type2fmt[] = {
        [NF4BAD] = 0,
        [NF4REG] = S_IFREG,
        [NF4DIR] = S_IFDIR,
        [NF4BLK] = S_IFBLK,
        [NF4CHR] = S_IFCHR,
        [NF4LNK] = S_IFLNK,
        [NF4SOCK] = S_IFSOCK,
        [NF4FIFO] = S_IFIFO,
        [NF4ATTRDIR] = 0,
        [NF4NAMEDATTR] = 0,
};

struct compound_hdr {
        int32_t         status;
        uint32_t        nops;
        __be32 *        nops_p;
        uint32_t        taglen;
        char *          tag;
        uint32_t        replen;         /* expected reply words */
        u32             minorversion;
};

static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
{
        __be32 *p = xdr_reserve_space(xdr, nbytes);
        BUG_ON(!p);
        return p;
}

static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
        __be32 *p;

        p = xdr_reserve_space(xdr, 4 + len);
        BUG_ON(p == NULL);
        xdr_encode_opaque(p, str, len);
}

static void encode_compound_hdr(struct xdr_stream *xdr,
                                struct rpc_rqst *req,
                                struct compound_hdr *hdr)
{
        __be32 *p;
        struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;

        /* initialize running count of expected bytes in reply.
         * NOTE: the replied tag SHOULD be the same is the one sent,
         * but this is not required as a MUST for the server to do so. */
        hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;

        dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
        BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
        p = reserve_space(xdr, 4 + hdr->taglen + 8);
        p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);
        *p++ = cpu_to_be32(hdr->minorversion);
        hdr->nops_p = p;
        *p = cpu_to_be32(hdr->nops);
}

static void encode_nops(struct compound_hdr *hdr)
{
        BUG_ON(hdr->nops > NFS4_MAX_OPS);
        *hdr->nops_p = htonl(hdr->nops);
}

static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
{
        __be32 *p;

        p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
        BUG_ON(p == NULL);
        xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
}

static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
{
        char owner_name[IDMAP_NAMESZ];
        char owner_group[IDMAP_NAMESZ];
        int owner_namelen = 0;
        int owner_grouplen = 0;
        __be32 *p;
        __be32 *q;
        int len;
        uint32_t bmval0 = 0;
        uint32_t bmval1 = 0;

        /*
         * We reserve enough space to write the entire attribute buffer at once.
         * In the worst-case, this would be
         *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
         *          = 36 bytes, plus any contribution from variable-length fields
         *            such as owner/group.
         */
        len = 16;

        /* Sigh */
        if (iap->ia_valid & ATTR_SIZE)
                len += 8;
        if (iap->ia_valid & ATTR_MODE)
                len += 4;
        if (iap->ia_valid & ATTR_UID) {
                owner_namelen = nfs_map_uid_to_name(server->nfs_client, iap->ia_uid, owner_name);
                if (owner_namelen < 0) {
                        dprintk("nfs: couldn't resolve uid %d to string\n",
                                        iap->ia_uid);
                        /* XXX */
                        strcpy(owner_name, "nobody");
                        owner_namelen = sizeof("nobody") - 1;
                        /* goto out; */
                }
                len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
        }
        if (iap->ia_valid & ATTR_GID) {
                owner_grouplen = nfs_map_gid_to_group(server->nfs_client, iap->ia_gid, owner_group);
                if (owner_grouplen < 0) {
                        dprintk("nfs: couldn't resolve gid %d to string\n",
                                        iap->ia_gid);
                        strcpy(owner_group, "nobody");
                        owner_grouplen = sizeof("nobody") - 1;
                        /* goto out; */
                }
                len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
        }
        if (iap->ia_valid & ATTR_ATIME_SET)
                len += 16;
        else if (iap->ia_valid & ATTR_ATIME)
                len += 4;
        if (iap->ia_valid & ATTR_MTIME_SET)
                len += 16;
        else if (iap->ia_valid & ATTR_MTIME)
                len += 4;
        p = reserve_space(xdr, len);

        /*
         * We write the bitmap length now, but leave the bitmap and the attribute
         * buffer length to be backfilled at the end of this routine.
         */
        *p++ = cpu_to_be32(2);
        q = p;
        p += 3;

        if (iap->ia_valid & ATTR_SIZE) {
                bmval0 |= FATTR4_WORD0_SIZE;
                p = xdr_encode_hyper(p, iap->ia_size);
        }
        if (iap->ia_valid & ATTR_MODE) {
                bmval1 |= FATTR4_WORD1_MODE;
                *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
        }
        if (iap->ia_valid & ATTR_UID) {
                bmval1 |= FATTR4_WORD1_OWNER;
                p = xdr_encode_opaque(p, owner_name, owner_namelen);
        }
        if (iap->ia_valid & ATTR_GID) {
                bmval1 |= FATTR4_WORD1_OWNER_GROUP;
                p = xdr_encode_opaque(p, owner_group, owner_grouplen);
        }
        if (iap->ia_valid & ATTR_ATIME_SET) {
                bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
                *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
                *p++ = cpu_to_be32(0);
                *p++ = cpu_to_be32(iap->ia_atime.tv_sec);
                *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
        }
        else if (iap->ia_valid & ATTR_ATIME) {
                bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
                *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
        }
        if (iap->ia_valid & ATTR_MTIME_SET) {
                bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
                *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
                *p++ = cpu_to_be32(0);
                *p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
                *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
        }
        else if (iap->ia_valid & ATTR_MTIME) {
                bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
                *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
        }

        /*
         * Now we backfill the bitmap and the attribute buffer length.
         */
        if (len != ((char *)p - (char *)q) + 4) {
                printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
                                len, ((char *)p - (char *)q) + 4);
                BUG();
        }
        len = (char *)p - (char *)q - 12;
        *q++ = htonl(bmval0);
        *q++ = htonl(bmval1);
        *q = htonl(len);

/* out: */
}

static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(OP_ACCESS);
        *p = cpu_to_be32(access);
        hdr->nops++;
        hdr->replen += decode_access_maxsz;
}

static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
        *p++ = cpu_to_be32(OP_CLOSE);
        *p++ = cpu_to_be32(arg->seqid->sequence->counter);
        xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
        hdr->nops++;
        hdr->replen += decode_close_maxsz;
}

static void encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 16);
        *p++ = cpu_to_be32(OP_COMMIT);
        p = xdr_encode_hyper(p, args->offset);
        *p = cpu_to_be32(args->count);
        hdr->nops++;
        hdr->replen += decode_commit_maxsz;
}

static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(OP_CREATE);
        *p = cpu_to_be32(create->ftype);

        switch (create->ftype) {
        case NF4LNK:
                p = reserve_space(xdr, 4);
                *p = cpu_to_be32(create->u.symlink.len);
                xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
                break;

        case NF4BLK: case NF4CHR:
                p = reserve_space(xdr, 8);
                *p++ = cpu_to_be32(create->u.device.specdata1);
                *p = cpu_to_be32(create->u.device.specdata2);
                break;

        default:
                break;
        }

        encode_string(xdr, create->name->len, create->name->name);
        hdr->nops++;
        hdr->replen += decode_create_maxsz;

        encode_attrs(xdr, create->attrs, create->server);
}

static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 12);
        *p++ = cpu_to_be32(OP_GETATTR);
        *p++ = cpu_to_be32(1);
        *p = cpu_to_be32(bitmap);
        hdr->nops++;
        hdr->replen += decode_getattr_maxsz;
}

static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 16);
        *p++ = cpu_to_be32(OP_GETATTR);
        *p++ = cpu_to_be32(2);
        *p++ = cpu_to_be32(bm0);
        *p = cpu_to_be32(bm1);
        hdr->nops++;
        hdr->replen += decode_getattr_maxsz;
}

static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
                           bitmask[1] & nfs4_fattr_bitmap[1], hdr);
}

static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],

                           bitmask[1] & nfs4_fsinfo_bitmap[1], hdr);
}

static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
                           bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
}

static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_GETFH);
        hdr->nops++;
        hdr->replen += decode_getfh_maxsz;
}

static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 8 + name->len);
        *p++ = cpu_to_be32(OP_LINK);
        xdr_encode_opaque(p, name->name, name->len);
        hdr->nops++;
        hdr->replen += decode_link_maxsz;
}

static inline int nfs4_lock_type(struct file_lock *fl, int block)
{
        if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
                return block ? NFS4_READW_LT : NFS4_READ_LT;
        return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
}

static inline uint64_t nfs4_lock_length(struct file_lock *fl)
{
        if (fl->fl_end == OFFSET_MAX)
                return ~(uint64_t)0;
        return fl->fl_end - fl->fl_start + 1;
}

/*
 * opcode,type,reclaim,offset,length,new_lock_owner = 32
 * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
 */
static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 32);
        *p++ = cpu_to_be32(OP_LOCK);
        *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
        *p++ = cpu_to_be32(args->reclaim);
        p = xdr_encode_hyper(p, args->fl->fl_start);
        p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
        *p = cpu_to_be32(args->new_lock_owner);
        if (args->new_lock_owner){
                p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+32);
                *p++ = cpu_to_be32(args->open_seqid->sequence->counter);
                p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
                *p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
                p = xdr_encode_hyper(p, args->lock_owner.clientid);
                *p++ = cpu_to_be32(16);
                p = xdr_encode_opaque_fixed(p, "lock id:", 8);
                xdr_encode_hyper(p, args->lock_owner.id);
        }
        else {
                p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
                p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
                *p = cpu_to_be32(args->lock_seqid->sequence->counter);
        }
        hdr->nops++;
        hdr->replen += decode_lock_maxsz;
}

static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 52);
        *p++ = cpu_to_be32(OP_LOCKT);
        *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
        p = xdr_encode_hyper(p, args->fl->fl_start);
        p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
        p = xdr_encode_hyper(p, args->lock_owner.clientid);
        *p++ = cpu_to_be32(16);
        p = xdr_encode_opaque_fixed(p, "lock id:", 8);
        xdr_encode_hyper(p, args->lock_owner.id);
        hdr->nops++;
        hdr->replen += decode_lockt_maxsz;
}

static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
        *p++ = cpu_to_be32(OP_LOCKU);
        *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
        *p++ = cpu_to_be32(args->seqid->sequence->counter);
        p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
        p = xdr_encode_hyper(p, args->fl->fl_start);
        xdr_encode_hyper(p, nfs4_lock_length(args->fl));
        hdr->nops++;
        hdr->replen += decode_locku_maxsz;
}

static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        int len = name->len;
        __be32 *p;

        p = reserve_space(xdr, 8 + len);
        *p++ = cpu_to_be32(OP_LOOKUP);
        xdr_encode_opaque(p, name->name, len);
        hdr->nops++;
        hdr->replen += decode_lookup_maxsz;
}

static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
{
        __be32 *p;

        p = reserve_space(xdr, 8);
        switch (fmode & (FMODE_READ|FMODE_WRITE)) {
        case FMODE_READ:
                *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
                break;
        case FMODE_WRITE:
                *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
                break;
        case FMODE_READ|FMODE_WRITE:
                *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
                break;
        default:
                *p++ = cpu_to_be32(0);
        }
        *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
}

static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
        __be32 *p;
 /*
 * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
 * owner 4 = 32
 */
        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(OP_OPEN);
        *p = cpu_to_be32(arg->seqid->sequence->counter);
        encode_share_access(xdr, arg->fmode);
        p = reserve_space(xdr, 28);
        p = xdr_encode_hyper(p, arg->clientid);
        *p++ = cpu_to_be32(16);
        p = xdr_encode_opaque_fixed(p, "open id:", 8);
        xdr_encode_hyper(p, arg->id);
}

static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
        __be32 *p;
        struct nfs_client *clp;

        p = reserve_space(xdr, 4);
        switch(arg->open_flags & O_EXCL) {
        case 0:
                *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
                encode_attrs(xdr, arg->u.attrs, arg->server);
                break;
        default:
                clp = arg->server->nfs_client;
                if (clp->cl_minorversion > 0) {
                        if (nfs4_has_persistent_session(clp)) {
                                *p = cpu_to_be32(NFS4_CREATE_GUARDED);
                                encode_attrs(xdr, arg->u.attrs, arg->server);
                        } else {
                                struct iattr dummy;

                                *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
                                encode_nfs4_verifier(xdr, &arg->u.verifier);
                                dummy.ia_valid = 0;
                                encode_attrs(xdr, &dummy, arg->server);
                        }
                } else {
                        *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
                        encode_nfs4_verifier(xdr, &arg->u.verifier);
                }
        }
}

static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        switch (arg->open_flags & O_CREAT) {
        case 0:
                *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
                break;
        default:
                BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
                *p = cpu_to_be32(NFS4_OPEN_CREATE);
                encode_createmode(xdr, arg);
        }
}

static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        switch (delegation_type) {
        case 0:
                *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
                break;
        case FMODE_READ:
                *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
                break;
        case FMODE_WRITE|FMODE_READ:
                *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
                break;
        default:
                BUG();
        }
}

static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
        encode_string(xdr, name->len, name->name);
}

static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
        encode_delegation_type(xdr, type);
}

static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
{
        __be32 *p;

        p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
        *p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
        xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
        encode_string(xdr, name->len, name->name);
}

static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
{
        encode_openhdr(xdr, arg);
        encode_opentype(xdr, arg);
        switch (arg->claim) {
        case NFS4_OPEN_CLAIM_NULL:
                encode_claim_null(xdr, arg->name);
                break;
        case NFS4_OPEN_CLAIM_PREVIOUS:
                encode_claim_previous(xdr, arg->u.delegation_type);
                break;
        case NFS4_OPEN_CLAIM_DELEGATE_CUR:
                encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
                break;
        default:
                BUG();
        }
        hdr->nops++;
        hdr->replen += decode_open_maxsz;
}

static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
        *p++ = cpu_to_be32(OP_OPEN_CONFIRM);
        p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
        *p = cpu_to_be32(arg->seqid->sequence->counter);
        hdr->nops++;
        hdr->replen += decode_open_confirm_maxsz;
}

static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
        *p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
        p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
        *p = cpu_to_be32(arg->seqid->sequence->counter);
        encode_share_access(xdr, arg->fmode);
        hdr->nops++;
        hdr->replen += decode_open_downgrade_maxsz;
}

static void
encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
{
        int len = fh->size;
        __be32 *p;

        p = reserve_space(xdr, 8 + len);
        *p++ = cpu_to_be32(OP_PUTFH);
        xdr_encode_opaque(p, fh->data, len);
        hdr->nops++;
        hdr->replen += decode_putfh_maxsz;
}

static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_PUTROOTFH);
        hdr->nops++;
        hdr->replen += decode_putrootfh_maxsz;
}

static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx)
{
        nfs4_stateid stateid;
        __be32 *p;

        p = reserve_space(xdr, NFS4_STATEID_SIZE);
        if (ctx->state != NULL) {
                nfs4_copy_stateid(&stateid, ctx->state, ctx->lockowner);
                xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
        } else
                xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
}

static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_READ);

        encode_stateid(xdr, args->context);

        p = reserve_space(xdr, 12);
        p = xdr_encode_hyper(p, args->offset);
        *p = cpu_to_be32(args->count);
        hdr->nops++;
        hdr->replen += decode_read_maxsz;
}

static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
{
        uint32_t attrs[2] = {
                FATTR4_WORD0_RDATTR_ERROR|FATTR4_WORD0_FILEID,
                FATTR4_WORD1_MOUNTED_ON_FILEID,
        };
        __be32 *p;

        p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
        *p++ = cpu_to_be32(OP_READDIR);
        p = xdr_encode_hyper(p, readdir->cookie);
        p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
        *p++ = cpu_to_be32(readdir->count >> 1);  /* We're not doing readdirplus */
        *p++ = cpu_to_be32(readdir->count);
        *p++ = cpu_to_be32(2);
        /* Switch to mounted_on_fileid if the server supports it */
        if (readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
                attrs[0] &= ~FATTR4_WORD0_FILEID;
        else
                attrs[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
        *p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
        *p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
        hdr->nops++;
        hdr->replen += decode_readdir_maxsz;
        dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
                        __func__,
                        (unsigned long long)readdir->cookie,
                        ((u32 *)readdir->verifier.data)[0],
                        ((u32 *)readdir->verifier.data)[1],
                        attrs[0] & readdir->bitmask[0],
                        attrs[1] & readdir->bitmask[1]);
}

static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_READLINK);
        hdr->nops++;
        hdr->replen += decode_readlink_maxsz;
}

static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 8 + name->len);
        *p++ = cpu_to_be32(OP_REMOVE);
        xdr_encode_opaque(p, name->name, name->len);
        hdr->nops++;
        hdr->replen += decode_remove_maxsz;
}

static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_RENAME);
        encode_string(xdr, oldname->len, oldname->name);
        encode_string(xdr, newname->len, newname->name);
        hdr->nops++;
        hdr->replen += decode_rename_maxsz;
}

static void encode_renew(struct xdr_stream *xdr, const struct nfs_client *client_stateid, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 12);
        *p++ = cpu_to_be32(OP_RENEW);
        xdr_encode_hyper(p, client_stateid->cl_clientid);
        hdr->nops++;
        hdr->replen += decode_renew_maxsz;
}

static void
encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_RESTOREFH);
        hdr->nops++;
        hdr->replen += decode_restorefh_maxsz;
}

static int
encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
        *p++ = cpu_to_be32(OP_SETATTR);
        xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
        p = reserve_space(xdr, 2*4);
        *p++ = cpu_to_be32(1);
        *p = cpu_to_be32(FATTR4_WORD0_ACL);
        if (arg->acl_len % 4)
                return -EINVAL;
        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(arg->acl_len);
        xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
        hdr->nops++;
        hdr->replen += decode_setacl_maxsz;
        return 0;
}

static void
encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_SAVEFH);
        hdr->nops++;
        hdr->replen += decode_savefh_maxsz;
}

static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
        *p++ = cpu_to_be32(OP_SETATTR);
        xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
        hdr->nops++;
        hdr->replen += decode_setattr_maxsz;
        encode_attrs(xdr, arg->iap, server);
}

static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
        *p++ = cpu_to_be32(OP_SETCLIENTID);
        xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);

        encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(setclientid->sc_prog);
        encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
        encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(setclientid->sc_cb_ident);
        hdr->nops++;
        hdr->replen += decode_setclientid_maxsz;
}

static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
        *p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
        p = xdr_encode_hyper(p, arg->clientid);
        xdr_encode_opaque_fixed(p, arg->confirm.data, NFS4_VERIFIER_SIZE);
        hdr->nops++;
        hdr->replen += decode_setclientid_confirm_maxsz;
}

static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(OP_WRITE);

        encode_stateid(xdr, args->context);

        p = reserve_space(xdr, 16);
        p = xdr_encode_hyper(p, args->offset);
        *p++ = cpu_to_be32(args->stable);
        *p = cpu_to_be32(args->count);

        xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
        hdr->nops++;
        hdr->replen += decode_write_maxsz;
}

static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);

        *p++ = cpu_to_be32(OP_DELEGRETURN);
        xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
        hdr->nops++;
        hdr->replen += decode_delegreturn_maxsz;
}

#if defined(CONFIG_NFS_V4_1)
/* NFSv4.1 operations */
static void encode_exchange_id(struct xdr_stream *xdr,
                               struct nfs41_exchange_id_args *args,
                               struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
        *p++ = cpu_to_be32(OP_EXCHANGE_ID);
        xdr_encode_opaque_fixed(p, args->verifier->data, sizeof(args->verifier->data));

        encode_string(xdr, args->id_len, args->id);

        p = reserve_space(xdr, 12);
        *p++ = cpu_to_be32(args->flags);
        *p++ = cpu_to_be32(0);  /* zero length state_protect4_a */
        *p = cpu_to_be32(0);    /* zero length implementation id array */
        hdr->nops++;
        hdr->replen += decode_exchange_id_maxsz;
}

static void encode_create_session(struct xdr_stream *xdr,
                                  struct nfs41_create_session_args *args,
                                  struct compound_hdr *hdr)
{
        __be32 *p;
        char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
        uint32_t len;
        struct nfs_client *clp = args->client;
        u32 max_resp_sz_cached;

        /*
         * Assumes OPEN is the biggest non-idempotent compound.
         * 2 is the verifier.
         */
        max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
                              RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;

        len = scnprintf(machine_name, sizeof(machine_name), "%s",
                        clp->cl_ipaddr);

        p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
        *p++ = cpu_to_be32(OP_CREATE_SESSION);
        p = xdr_encode_hyper(p, clp->cl_ex_clid);
        *p++ = cpu_to_be32(clp->cl_seqid);                      /*Sequence id */
        *p++ = cpu_to_be32(args->flags);                        /*flags */

        /* Fore Channel */
        *p++ = cpu_to_be32(args->fc_attrs.headerpadsz); /* header padding size */
        *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
        *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
        *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
        *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
        *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
        *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */

        /* Back Channel */
        *p++ = cpu_to_be32(args->fc_attrs.headerpadsz); /* header padding size */
        *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
        *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
        *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
        *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
        *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
        *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */

        *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
        *p++ = cpu_to_be32(1);
        *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */

        /* authsys_parms rfc1831 */
        *p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);     /* stamp */
        p = xdr_encode_opaque(p, machine_name, len);
        *p++ = cpu_to_be32(0);                          /* UID */
        *p++ = cpu_to_be32(0);                          /* GID */
        *p = cpu_to_be32(0);                            /* No more gids */
        hdr->nops++;
        hdr->replen += decode_create_session_maxsz;
}

static void encode_destroy_session(struct xdr_stream *xdr,
                                   struct nfs4_session *session,
                                   struct compound_hdr *hdr)
{
        __be32 *p;
        p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
        *p++ = cpu_to_be32(OP_DESTROY_SESSION);
        xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
        hdr->nops++;
        hdr->replen += decode_destroy_session_maxsz;
}

static void encode_reclaim_complete(struct xdr_stream *xdr,
                                    struct nfs41_reclaim_complete_args *args,
                                    struct compound_hdr *hdr)
{
        __be32 *p;

        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(OP_RECLAIM_COMPLETE);
        *p++ = cpu_to_be32(args->one_fs);
        hdr->nops++;
        hdr->replen += decode_reclaim_complete_maxsz;
}
#endif /* CONFIG_NFS_V4_1 */

static void encode_sequence(struct xdr_stream *xdr,
                            const struct nfs4_sequence_args *args,
                            struct compound_hdr *hdr)
{
#if defined(CONFIG_NFS_V4_1)
        struct nfs4_session *session = args->sa_session;
        struct nfs4_slot_table *tp;
        struct nfs4_slot *slot;
        __be32 *p;

        if (!session)
                return;

        tp = &session->fc_slot_table;

        WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
        slot = tp->slots + args->sa_slotid;

        p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
        *p++ = cpu_to_be32(OP_SEQUENCE);

        /*
         * Sessionid + seqid + slotid + max slotid + cache_this
         */
        dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
                "max_slotid=%d cache_this=%d\n",
                __func__,
                ((u32 *)session->sess_id.data)[0],
                ((u32 *)session->sess_id.data)[1],
                ((u32 *)session->sess_id.data)[2],
                ((u32 *)session->sess_id.data)[3],
                slot->seq_nr, args->sa_slotid,
                tp->highest_used_slotid, args->sa_cache_this);
        p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
        *p++ = cpu_to_be32(slot->seq_nr);
        *p++ = cpu_to_be32(args->sa_slotid);
        *p++ = cpu_to_be32(tp->highest_used_slotid);
        *p = cpu_to_be32(args->sa_cache_this);
        hdr->nops++;
        hdr->replen += decode_sequence_maxsz;
#endif /* CONFIG_NFS_V4_1 */
}

/*
 * END OF "GENERIC" ENCODE ROUTINES.
 */

static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
{
#if defined(CONFIG_NFS_V4_1)
        if (args->sa_session)
                return args->sa_session->clp->cl_minorversion;
#endif /* CONFIG_NFS_V4_1 */
        return 0;
}

/*
 * Encode an ACCESS request
 */
static int nfs4_xdr_enc_access(struct rpc_rqst *req, __be32 *p, const struct nfs4_accessargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_access(&xdr, args->access, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode LOOKUP request
 */
static int nfs4_xdr_enc_lookup(struct rpc_rqst *req, __be32 *p, const struct nfs4_lookup_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->dir_fh, &hdr);
        encode_lookup(&xdr, args->name, &hdr);
        encode_getfh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode LOOKUP_ROOT request
 */
static int nfs4_xdr_enc_lookup_root(struct rpc_rqst *req, __be32 *p, const struct nfs4_lookup_root_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putrootfh(&xdr, &hdr);
        encode_getfh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode REMOVE request
 */
static int nfs4_xdr_enc_remove(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_remove(&xdr, &args->name, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode RENAME request
 */
static int nfs4_xdr_enc_rename(struct rpc_rqst *req, __be32 *p, const struct nfs4_rename_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->old_dir, &hdr);
        encode_savefh(&xdr, &hdr);
        encode_putfh(&xdr, args->new_dir, &hdr);
        encode_rename(&xdr, args->old_name, args->new_name, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_restorefh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode LINK request
 */
static int nfs4_xdr_enc_link(struct rpc_rqst *req, __be32 *p, const struct nfs4_link_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_savefh(&xdr, &hdr);
        encode_putfh(&xdr, args->dir_fh, &hdr);
        encode_link(&xdr, args->name, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_restorefh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode CREATE request
 */
static int nfs4_xdr_enc_create(struct rpc_rqst *req, __be32 *p, const struct nfs4_create_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->dir_fh, &hdr);
        encode_savefh(&xdr, &hdr);
        encode_create(&xdr, args, &hdr);
        encode_getfh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_restorefh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode SYMLINK request
 */
static int nfs4_xdr_enc_symlink(struct rpc_rqst *req, __be32 *p, const struct nfs4_create_arg *args)
{
        return nfs4_xdr_enc_create(req, p, args);
}

/*
 * Encode GETATTR request
 */
static int nfs4_xdr_enc_getattr(struct rpc_rqst *req, __be32 *p, const struct nfs4_getattr_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a CLOSE request
 */
static int nfs4_xdr_enc_close(struct rpc_rqst *req, __be32 *p, struct nfs_closeargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_close(&xdr, args, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode an OPEN request
 */
static int nfs4_xdr_enc_open(struct rpc_rqst *req, __be32 *p, struct nfs_openargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_savefh(&xdr, &hdr);
        encode_open(&xdr, args, &hdr);
        encode_getfh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_restorefh(&xdr, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode an OPEN_CONFIRM request
 */
static int nfs4_xdr_enc_open_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_open_confirmargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .nops   = 0,
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_open_confirm(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode an OPEN request with no attributes.
 */
static int nfs4_xdr_enc_open_noattr(struct rpc_rqst *req, __be32 *p, struct nfs_openargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_open(&xdr, args, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode an OPEN_DOWNGRADE request
 */
static int nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req, __be32 *p, struct nfs_closeargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_open_downgrade(&xdr, args, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a LOCK request
 */
static int nfs4_xdr_enc_lock(struct rpc_rqst *req, __be32 *p, struct nfs_lock_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {

                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_lock(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a LOCKT request
 */
static int nfs4_xdr_enc_lockt(struct rpc_rqst *req, __be32 *p, struct nfs_lockt_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_lockt(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a LOCKU request
 */
static int nfs4_xdr_enc_locku(struct rpc_rqst *req, __be32 *p, struct nfs_locku_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_locku(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a READLINK request
 */
static int nfs4_xdr_enc_readlink(struct rpc_rqst *req, __be32 *p, const struct nfs4_readlink *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_readlink(&xdr, args, req, &hdr);

        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
                        args->pgbase, args->pglen);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a READDIR request
 */
static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, __be32 *p, const struct nfs4_readdir_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_readdir(&xdr, args, req, &hdr);

        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
                         args->pgbase, args->count);
        dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
                        __func__, hdr.replen << 2, args->pages,
                        args->pgbase, args->count);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a READ request
 */
static int nfs4_xdr_enc_read(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_read(&xdr, args, &hdr);

        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
                         args->pages, args->pgbase, args->count);
        req->rq_rcv_buf.flags |= XDRBUF_READ;
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode an SETATTR request
 */
static int nfs4_xdr_enc_setattr(struct rpc_rqst *req, __be32 *p, struct nfs_setattrargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_setattr(&xdr, args, args->server, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a GETACL request
 */
static int
nfs4_xdr_enc_getacl(struct rpc_rqst *req, __be32 *p,
                struct nfs_getaclargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };
        uint32_t replen;

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        replen = hdr.replen + op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz + 1;
        encode_getattr_two(&xdr, FATTR4_WORD0_ACL, 0, &hdr);

        xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
                args->acl_pages, args->acl_pgbase, args->acl_len);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode a WRITE request
 */
static int nfs4_xdr_enc_write(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_write(&xdr, args, &hdr);
        req->rq_snd_buf.flags |= XDRBUF_WRITE;
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 *  a COMMIT request
 */
static int nfs4_xdr_enc_commit(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_commit(&xdr, args, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * FSINFO request
 */
static int nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, __be32 *p, struct nfs4_fsinfo_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_fsinfo(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a PATHCONF request
 */
static int nfs4_xdr_enc_pathconf(struct rpc_rqst *req, __be32 *p, const struct nfs4_pathconf_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_getattr_one(&xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
                           &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a STATFS request
 */
static int nfs4_xdr_enc_statfs(struct rpc_rqst *req, __be32 *p, const struct nfs4_statfs_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fh, &hdr);
        encode_getattr_two(&xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
                           args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * GETATTR_BITMAP request
 */
static int nfs4_xdr_enc_server_caps(struct rpc_rqst *req, __be32 *p,
                                    struct nfs4_server_caps_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fhandle, &hdr);
        encode_getattr_one(&xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
                           FATTR4_WORD0_LINK_SUPPORT|
                           FATTR4_WORD0_SYMLINK_SUPPORT|
                           FATTR4_WORD0_ACLSUPPORT, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a RENEW request
 */
static int nfs4_xdr_enc_renew(struct rpc_rqst *req, __be32 *p, struct nfs_client *clp)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .nops   = 0,
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_renew(&xdr, clp, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a SETCLIENTID request
 */
static int nfs4_xdr_enc_setclientid(struct rpc_rqst *req, __be32 *p, struct nfs4_setclientid *sc)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .nops   = 0,
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_setclientid(&xdr, sc, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a SETCLIENTID_CONFIRM request
 */
static int nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req, __be32 *p, struct nfs4_setclientid_res *arg)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .nops   = 0,
        };
        const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_setclientid_confirm(&xdr, arg, &hdr);
        encode_putrootfh(&xdr, &hdr);
        encode_fsinfo(&xdr, lease_bitmap, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * DELEGRETURN request
 */
static int nfs4_xdr_enc_delegreturn(struct rpc_rqst *req, __be32 *p, const struct nfs4_delegreturnargs *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->fhandle, &hdr);
        encode_delegreturn(&xdr, args->stateid, &hdr);
        encode_getfattr(&xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * Encode FS_LOCATIONS request
 */
static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, __be32 *p, struct nfs4_fs_locations_arg *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };
        uint32_t replen;

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_putfh(&xdr, args->dir_fh, &hdr);
        encode_lookup(&xdr, args->name, &hdr);
        replen = hdr.replen;    /* get the attribute into args->page */
        encode_fs_locations(&xdr, args->bitmask, &hdr);

        xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
                        0, PAGE_SIZE);
        encode_nops(&hdr);
        return 0;
}

#if defined(CONFIG_NFS_V4_1)
/*
 * EXCHANGE_ID request
 */
static int nfs4_xdr_enc_exchange_id(struct rpc_rqst *req, uint32_t *p,
                                    struct nfs41_exchange_id_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = args->client->cl_minorversion,
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_exchange_id(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a CREATE_SESSION request
 */
static int nfs4_xdr_enc_create_session(struct rpc_rqst *req, uint32_t *p,
                                       struct nfs41_create_session_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = args->client->cl_minorversion,
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_create_session(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a DESTROY_SESSION request
 */
static int nfs4_xdr_enc_destroy_session(struct rpc_rqst *req, uint32_t *p,
                                        struct nfs4_session *session)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = session->clp->cl_minorversion,
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_destroy_session(&xdr, session, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a SEQUENCE request
 */
static int nfs4_xdr_enc_sequence(struct rpc_rqst *req, uint32_t *p,
                                 struct nfs4_sequence_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(args),
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a GET_LEASE_TIME request
 */
static int nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req, uint32_t *p,
                                       struct nfs4_get_lease_time_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
        };
        const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->la_seq_args, &hdr);
        encode_putrootfh(&xdr, &hdr);
        encode_fsinfo(&xdr, lease_bitmap, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 * a RECLAIM_COMPLETE request
 */
static int nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req, uint32_t *p,
                                     struct nfs41_reclaim_complete_args *args)
{
        struct xdr_stream xdr;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args)
        };

        xdr_init_encode(&xdr, &req->rq_snd_buf, p);
        encode_compound_hdr(&xdr, req, &hdr);
        encode_sequence(&xdr, &args->seq_args, &hdr);
        encode_reclaim_complete(&xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

#endif /* CONFIG_NFS_V4_1 */

static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
        dprintk("nfs: %s: prematurely hit end of receive buffer. "
                "Remaining buffer length is %tu words.\n",
                func, xdr->end - xdr->p);
}

static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
{
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                goto out_overflow;
        *len = be32_to_cpup(p);
        p = xdr_inline_decode(xdr, *len);
        if (unlikely(!p))
                goto out_overflow;
        *string = (char *)p;
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        __be32 *p;

        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                goto out_overflow;
        hdr->status = be32_to_cpup(p++);
        hdr->taglen = be32_to_cpup(p);

        p = xdr_inline_decode(xdr, hdr->taglen + 4);
        if (unlikely(!p))
                goto out_overflow;
        hdr->tag = (char *)p;
        p += XDR_QUADLEN(hdr->taglen);
        hdr->nops = be32_to_cpup(p);
        if (unlikely(hdr->nops < 1))
                return nfs4_stat_to_errno(hdr->status);
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
{
        __be32 *p;
        uint32_t opnum;
        int32_t nfserr;

        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                goto out_overflow;
        opnum = be32_to_cpup(p++);
        if (opnum != expected) {
                dprintk("nfs: Server returned operation"
                        " %d but we issued a request for %d\n",
                                opnum, expected);
                return -EIO;
        }
        nfserr = be32_to_cpup(p);
        if (nfserr != NFS_OK)
                return nfs4_stat_to_errno(nfserr);
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

/* Dummy routine */
static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
{
        __be32 *p;
        unsigned int strlen;
        char *str;

        p = xdr_inline_decode(xdr, 12);
        if (likely(p))
                return decode_opaque_inline(xdr, &strlen, &str);
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
        uint32_t bmlen;
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                goto out_overflow;
        bmlen = be32_to_cpup(p);

        bitmap[0] = bitmap[1] = 0;
        p = xdr_inline_decode(xdr, (bmlen << 2));
        if (unlikely(!p))
                goto out_overflow;
        if (bmlen > 0) {
                bitmap[0] = be32_to_cpup(p++);
                if (bmlen > 1)
                        bitmap[1] = be32_to_cpup(p);
        }
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, __be32 **savep)
{
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                goto out_overflow;
        *attrlen = be32_to_cpup(p);
        *savep = xdr->p;
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
{
        if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
                decode_attr_bitmap(xdr, bitmask);
                bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
        } else
                bitmask[0] = bitmask[1] = 0;
        dprintk("%s: bitmask=%08x:%08x\n", __func__, bitmask[0], bitmask[1]);
        return 0;
}

static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
{
        __be32 *p;
        int ret = 0;

        *type = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        goto out_overflow;
                *type = be32_to_cpup(p);
                if (*type < NF4REG || *type > NF4NAMEDATTR) {
                        dprintk("%s: bad type %d\n", __func__, *type);
                        return -EIO;
                }
                bitmap[0] &= ~FATTR4_WORD0_TYPE;
                ret = NFS_ATTR_FATTR_TYPE;
        }
        dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
        return ret;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
{
        __be32 *p;
        int ret = 0;

        *change = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, change);
                bitmap[0] &= ~FATTR4_WORD0_CHANGE;
                ret = NFS_ATTR_FATTR_CHANGE;
        }
        dprintk("%s: change attribute=%Lu\n", __func__,
                        (unsigned long long)*change);
        return ret;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
{
        __be32 *p;
        int ret = 0;

        *size = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, size);
                bitmap[0] &= ~FATTR4_WORD0_SIZE;
                ret = NFS_ATTR_FATTR_SIZE;
        }
        dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
        return ret;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
        __be32 *p;

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        goto out_overflow;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
        }
        dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
        __be32 *p;

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        goto out_overflow;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
        }
        dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
{
        __be32 *p;
        int ret = 0;

        fsid->major = 0;
        fsid->minor = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
                p = xdr_inline_decode(xdr, 16);
                if (unlikely(!p))
                        goto out_overflow;
                p = xdr_decode_hyper(p, &fsid->major);
                xdr_decode_hyper(p, &fsid->minor);
                bitmap[0] &= ~FATTR4_WORD0_FSID;
                ret = NFS_ATTR_FATTR_FSID;
        }
        dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
                        (unsigned long long)fsid->major,
                        (unsigned long long)fsid->minor);
        return ret;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
        __be32 *p;

        *res = 60;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        goto out_overflow;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
        }
        dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
        __be32 *p;

        *res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        goto out_overflow;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
        }
        dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
        return 0;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
{
        __be32 *p;
        int ret = 0;

        *fileid = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, fileid);
                bitmap[0] &= ~FATTR4_WORD0_FILEID;
                ret = NFS_ATTR_FATTR_FILEID;
        }
        dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
        return ret;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
{
        __be32 *p;
        int ret = 0;

        *fileid = 0;
        if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
                return -EIO;
        if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, fileid);
                bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
                ret = NFS_ATTR_FATTR_FILEID;
        }
        dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
        return ret;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
        __be32 *p;
        int status = 0;

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
        }
        dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
        return status;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
        __be32 *p;
        int status = 0;

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
        }
        dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
        return status;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
        __be32 *p;
        int status = 0;

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
                p = xdr_inline_decode(xdr, 8);
                if (unlikely(!p))
                        goto out_overflow;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
        }
        dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
        return status;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
{
        u32 n;
        __be32 *p;
        int status = 0;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                goto out_overflow;
        n = be32_to_cpup(p);
        if (n == 0)
                goto root_path;
        dprintk("path ");
        path->ncomponents = 0;
        while (path->ncomponents < n) {
                struct nfs4_string *component = &path->components[path->ncomponents];
                status = decode_opaque_inline(xdr, &component->len, &component->data);
                if (unlikely(status != 0))
                        goto out_eio;
                if (path->ncomponents != n)
                        dprintk("/");
                dprintk("%s", component->data);
                if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
                        path->ncomponents++;
                else {
                        dprintk("cannot parse %d components in path\n", n);
                        goto out_eio;
                }
        }
out:
        dprintk("\n");
        return status;
root_path:
/* a root pathname is sent as a zero component4 */
        path->ncomponents = 1;
        path->components[0].len=0;
        path->components[0].data=NULL;
        dprintk("path /\n");
        goto out;
out_eio:
        dprintk(" status %d", status);
        status = -EIO;
        goto out;
out_overflow:
        print_overflow_msg(__func__, xdr);
        return -EIO;
}

static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
{
        int n;
        __be32 *p;
        int status = -EIO;

        if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
                goto out;
        status = 0;
        if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
                goto out;
        dprintk("%s: fsroot ", __func__);
        status = decode_pathname(xdr, &res->fs_path);