fs/nfs/nfs4xdr.c

/*
 *  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]