/*
 *  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/module.h>
#include <linux/utsname.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/gss_api.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"
#include "nfs4session.h"
#include "pnfs.h"
#include "netns.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 + 2 + 1 + 1 + 2)
#define lock_owner_id_maxsz     (1 + 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 4
#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))
/* We support only one layout type per file system */
#define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
/* 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 + decode_mdsthreshold_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)
/* The 5 accounts for the PNFS attributes, and assumes that at most three
 * layout types will be returned.
 */
#define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
                                 nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
#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_lockowner_maxsz  (7)
#define encode_lock_maxsz       (op_encode_hdr_maxsz + \
                                 7 + \
                                 1 + encode_stateid_maxsz + 1 + \
                                 encode_lockowner_maxsz)
#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 + 5 + \
                                encode_lockowner_maxsz)
#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_release_lockowner_maxsz \
                                (op_encode_hdr_maxsz + \
                                 encode_lockowner_maxsz)
#define decode_release_lockowner_maxsz \
                                (op_decode_hdr_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)
#define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
#define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))

#if defined(CONFIG_NFS_V4_1)
#define NFS4_MAX_MACHINE_NAME_LEN (64)
#define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
                         sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)

#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 /* implementation id array of size 1 */ + \
                                1 /* nii_domain */ + \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
                                1 /* nii_name */ + \
                                XDR_QUADLEN(IMPL_NAME_LIMIT) + \
                                3 /* nii_date */)
#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 */ + \
                                1 /* nii_domain */ + \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
                                1 /* nii_name */ + \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
                                3 /* nii_date */)
#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_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
                                     /* bctsa_sessid */ \
                                     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
                                     1 /* bctsa_dir */ + \
                                     1 /* bctsa_use_conn_in_rdma_mode */)
#define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
                                     /* bctsr_sessid */ \
                                     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
                                     1 /* bctsr_dir */ + \
                                     1 /* bctsr_use_conn_in_rdma_mode */)
#define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
#define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
#define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
#define decode_destroy_clientid_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)
#define encode_getdevicelist_maxsz (op_encode_hdr_maxsz + 4 + \
                                encode_verifier_maxsz)
#define decode_getdevicelist_maxsz (op_decode_hdr_maxsz + \
                                2 /* nfs_cookie4 gdlr_cookie */ + \
                                decode_verifier_maxsz \
                                  /* verifier4 gdlr_verifier */ + \
                                1 /* gdlr_deviceid_list count */ + \
                                XDR_QUADLEN(NFS4_PNFS_GETDEVLIST_MAXNUM * \
                                            NFS4_DEVICEID4_SIZE) \
                                  /* gdlr_deviceid_list */ + \
                                1 /* bool gdlr_eof */)
#define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + 4 + \
                                XDR_QUADLEN(NFS4_DEVICEID4_SIZE))
#define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
                                1 /* layout type */ + \
                                1 /* opaque devaddr4 length */ + \
                                  /* devaddr4 payload is read into page */ \
                                1 /* notification bitmap length */ + \
                                1 /* notification bitmap */)
#define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
                                encode_stateid_maxsz)
#define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
                                decode_stateid_maxsz + \
                                XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
#define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
                                2 /* offset */ + \
                                2 /* length */ + \
                                1 /* reclaim */ + \
                                encode_stateid_maxsz + \
                                1 /* new offset (true) */ + \
                                2 /* last byte written */ + \
                                1 /* nt_timechanged (false) */ + \
                                1 /* layoutupdate4 layout type */ + \
                                1 /* NULL filelayout layoutupdate4 payload */)
#define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
#define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
                                encode_stateid_maxsz + \
                                1 /* FIXME: opaque lrf_body always empty at the moment */)
#define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
                                1 + decode_stateid_maxsz)
#define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
#define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
#define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
                                         XDR_QUADLEN(NFS4_STATEID_SIZE))
#define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
#define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
                                         XDR_QUADLEN(NFS4_STATEID_SIZE))
#define decode_free_stateid_maxsz       (op_decode_hdr_maxsz + 1)
#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)
#define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_commit_maxsz)
#define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_open_maxsz + \
                                encode_access_maxsz + \
                                encode_getfh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_open_maxsz + \
                                decode_access_maxsz + \
                                decode_getfh_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_access_maxsz + \
                                        encode_getattr_maxsz)
#define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
                                        decode_sequence_maxsz + \
                                        decode_putfh_maxsz + \
                                        decode_open_maxsz + \
                                        decode_access_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)
#define NFS4_dec_setclientid_confirm_sz \
                                (compound_decode_hdr_maxsz + \
                                decode_setclientid_confirm_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_release_lockowner_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_lockowner_maxsz)
#define NFS4_dec_release_lockowner_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_lockowner_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)
#define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_remove_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)
#define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_savefh_maxsz + \
                                decode_putfh_maxsz + \
                                decode_rename_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 + \
                                encode_restorefh_maxsz + \
                                encode_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_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_create_maxsz + \
                                encode_getfh_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_create_maxsz + \
                                decode_getfh_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)
#define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_secinfo_maxsz)
#define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_secinfo_maxsz)
#if defined(CONFIG_NFS_V4_1)
#define NFS4_enc_bind_conn_to_session_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_bind_conn_to_session_maxsz)
#define NFS4_dec_bind_conn_to_session_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_bind_conn_to_session_maxsz)
#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_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
                                         encode_destroy_clientid_maxsz)
#define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
                                         decode_destroy_clientid_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)
#define NFS4_enc_getdevicelist_sz (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_getdevicelist_maxsz)
#define NFS4_dec_getdevicelist_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_getdevicelist_maxsz)
#define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
                                encode_sequence_maxsz +\
                                encode_getdeviceinfo_maxsz)
#define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
                                decode_sequence_maxsz + \
                                decode_getdeviceinfo_maxsz)
#define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz +        \
                                encode_layoutget_maxsz)
#define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz +        \
                                decode_layoutget_maxsz)
#define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz +\
                                encode_putfh_maxsz + \
                                encode_layoutcommit_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_layoutcommit_maxsz + \
                                decode_getattr_maxsz)
#define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_layoutreturn_maxsz)
#define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_layoutreturn_maxsz)
#define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
                                        encode_sequence_maxsz + \
                                        encode_putrootfh_maxsz +\
                                        encode_secinfo_no_name_maxsz)
#define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
                                        decode_sequence_maxsz + \
                                        decode_putrootfh_maxsz + \
                                        decode_secinfo_no_name_maxsz)
#define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
                                         encode_sequence_maxsz + \
                                         encode_test_stateid_maxsz)
#define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
                                         decode_sequence_maxsz + \
                                         decode_test_stateid_maxsz)
#define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
                                         encode_sequence_maxsz + \
                                         encode_free_stateid_maxsz)
#define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
                                         decode_sequence_maxsz + \
                                         decode_free_stateid_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_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
{
        __be32 *p;

        p = xdr_reserve_space(xdr, len);
        xdr_encode_opaque_fixed(p, buf, len);
}

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

        p = reserve_space(xdr, 4 + len);
        xdr_encode_opaque(p, str, len);
}

static void encode_uint32(struct xdr_stream *xdr, u32 n)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(n);
}

static void encode_uint64(struct xdr_stream *xdr, u64 n)
{
        __be32 *p;

        p = reserve_space(xdr, 8);
        xdr_encode_hyper(p, n);
}

static void encode_nfs4_seqid(struct xdr_stream *xdr,
                const struct nfs_seqid *seqid)
{
        encode_uint32(xdr, seqid->sequence->counter);
}

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_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;

        WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
        encode_string(xdr, hdr->taglen, hdr->tag);
        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(hdr->minorversion);
        hdr->nops_p = p;
        *p = cpu_to_be32(hdr->nops);
}

static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
                uint32_t replen,
                struct compound_hdr *hdr)
{
        encode_uint32(xdr, op);
        hdr->nops++;
        hdr->replen += replen;
}

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

static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
{
        encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
}

static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
{
        encode_opaque_fixed(xdr, 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, iap->ia_uid, owner_name, IDMAP_NAMESZ);
                if (owner_namelen < 0) {
                        dprintk("nfs: couldn't resolve uid %d to string\n",

                                        from_kuid(&init_user_ns, 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, iap->ia_gid, owner_group, IDMAP_NAMESZ);
                if (owner_grouplen < 0) {
                        dprintk("nfs: couldn't resolve gid %d to string\n",
                                        from_kgid(&init_user_ns, 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 = xdr_encode_hyper(p, (s64)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 = xdr_encode_hyper(p, (s64)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)
{
        encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
        encode_uint32(xdr, access);
}

static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
        encode_nfs4_seqid(xdr, arg->seqid);
        encode_nfs4_stateid(xdr, arg->stateid);
}

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

        encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
        p = reserve_space(xdr, 12);
        p = xdr_encode_hyper(p, args->offset);
        *p = cpu_to_be32(args->count);
}

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

        encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
        encode_uint32(xdr, 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);
        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;

        encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(1);
        *p = cpu_to_be32(bitmap);
}

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

        encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
        p = reserve_space(xdr, 12);
        *p++ = cpu_to_be32(2);
        *p++ = cpu_to_be32(bm0);
        *p = cpu_to_be32(bm1);
}

static void
encode_getattr_three(struct xdr_stream *xdr,
                     uint32_t bm0, uint32_t bm1, uint32_t bm2,
                     struct compound_hdr *hdr)
{
        __be32 *p;

        encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
        if (bm2) {
                p = reserve_space(xdr, 16);
                *p++ = cpu_to_be32(3);
                *p++ = cpu_to_be32(bm0);
                *p++ = cpu_to_be32(bm1);
                *p = cpu_to_be32(bm2);
        } else if (bm1) {
                p = reserve_space(xdr, 12);
                *p++ = cpu_to_be32(2);
                *p++ = cpu_to_be32(bm0);
                *p = cpu_to_be32(bm1);
        } else {
                p = reserve_space(xdr, 8);
                *p++ = cpu_to_be32(1);
                *p = cpu_to_be32(bm0);
        }
}

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_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
                                 const u32 *open_bitmap,
                                 struct compound_hdr *hdr)
{
        encode_getattr_three(xdr,
                             bitmask[0] & open_bitmap[0],
                             bitmask[1] & open_bitmap[1],
                             bitmask[2] & open_bitmap[2],
                             hdr);
}

static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr_three(xdr,
                             bitmask[0] & nfs4_fsinfo_bitmap[0],
                             bitmask[1] & nfs4_fsinfo_bitmap[1],
                             bitmask[2] & nfs4_fsinfo_bitmap[2],
                             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)
{
        encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
}

static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
        encode_string(xdr, name->len, name->name);
}

static inline int nfs4_lock_type(struct file_lock *fl, int block)
{
        if (fl->fl_type == 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;
}

static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
{
        __be32 *p;

        p = reserve_space(xdr, 32);
        p = xdr_encode_hyper(p, lowner->clientid);
        *p++ = cpu_to_be32(20);
        p = xdr_encode_opaque_fixed(p, "lock id:", 8);
        *p++ = cpu_to_be32(lowner->s_dev);
        xdr_encode_hyper(p, lowner->id);
}

/*
 * 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;

        encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
        p = reserve_space(xdr, 28);
        *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){
                encode_nfs4_seqid(xdr, args->open_seqid);
                encode_nfs4_stateid(xdr, args->open_stateid);
                encode_nfs4_seqid(xdr, args->lock_seqid);
                encode_lockowner(xdr, &args->lock_owner);
        }
        else {
                encode_nfs4_stateid(xdr, args->lock_stateid);
                encode_nfs4_seqid(xdr, args->lock_seqid);
        }
}

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

        encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
        p = reserve_space(xdr, 20);
        *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));
        encode_lockowner(xdr, &args->lock_owner);
}

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

        encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
        encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
        encode_nfs4_seqid(xdr, args->seqid);
        encode_nfs4_stateid(xdr, args->stateid);
        p = reserve_space(xdr, 16);
        p = xdr_encode_hyper(p, args->fl->fl_start);
        xdr_encode_hyper(p, nfs4_lock_length(args->fl));
}

static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
        encode_lockowner(xdr, lowner);
}

static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
        encode_string(xdr, name->len, name->name);
}

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
 */
        encode_nfs4_seqid(xdr, arg->seqid);
        encode_share_access(xdr, arg->fmode);
        p = reserve_space(xdr, 36);
        p = xdr_encode_hyper(p, arg->clientid);
        *p++ = cpu_to_be32(24);
        p = xdr_encode_opaque_fixed(p, "open id:", 8);
        *p++ = cpu_to_be32(arg->server->s_dev);
        *p++ = cpu_to_be32(arg->id.uniquifier);
        xdr_encode_hyper(p, arg->id.create_time);
}

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

        p = reserve_space(xdr, 4);
        switch(arg->createmode) {
        case NFS4_CREATE_UNCHECKED:
                *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
                encode_attrs(xdr, arg->u.attrs, arg->server);
                break;
        case NFS4_CREATE_GUARDED:
                *p = cpu_to_be32(NFS4_CREATE_GUARDED);
                encode_attrs(xdr, arg->u.attrs, arg->server);
                break;
        case NFS4_CREATE_EXCLUSIVE:
                *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
                encode_nfs4_verifier(xdr, &arg->u.verifier);
                break;
        case NFS4_CREATE_EXCLUSIVE4_1:
                *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);
        }
}

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:
                *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);
        *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
        encode_nfs4_stateid(xdr, stateid);
        encode_string(xdr, name->len, name->name);
}

static inline void encode_claim_fh(struct xdr_stream *xdr)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
}

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

        p = reserve_space(xdr, 4);
        *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
        encode_nfs4_stateid(xdr, stateid);
}

static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, 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;
        case NFS4_OPEN_CLAIM_FH:
                encode_claim_fh(xdr);
                break;
        case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
                encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
                break;
        default:
                BUG();
        }
}

static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
        encode_nfs4_stateid(xdr, arg->stateid);
        encode_nfs4_seqid(xdr, arg->seqid);
}

static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
        encode_nfs4_stateid(xdr, arg->stateid);
        encode_nfs4_seqid(xdr, arg->seqid);
        encode_share_access(xdr, arg->fmode);
}

static void
encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
        encode_string(xdr, fh->size, fh->data);
}

static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
}

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

        encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
        encode_nfs4_stateid(xdr, &args->stateid);

        p = reserve_space(xdr, 12);
        p = xdr_encode_hyper(p, args->offset);
        *p = cpu_to_be32(args->count);
}

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_WORD1_MOUNTED_ON_FILEID,
        };
        uint32_t dircount = readdir->count >> 1;
        __be32 *p, verf[2];

        if (readdir->plus) {
                attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
                        FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
                attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
                        FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
                        FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
                        FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
                dircount >>= 1;
        }
        /* Use mounted_on_fileid only if the server supports it */
        if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
                attrs[0] |= FATTR4_WORD0_FILEID;

        encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
        encode_uint64(xdr, readdir->cookie);
        encode_nfs4_verifier(xdr, &readdir->verifier);
        p = reserve_space(xdr, 20);
        *p++ = cpu_to_be32(dircount);
        *p++ = cpu_to_be32(readdir->count);
        *p++ = cpu_to_be32(2);

        *p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
        *p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
        memcpy(verf, readdir->verifier.data, sizeof(verf));
        dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
                        __func__,
                        (unsigned long long)readdir->cookie,
                        verf[0], verf[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)
{
        encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
}

static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
        encode_string(xdr, name->len, name->name);
}

static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
        encode_string(xdr, oldname->len, oldname->name);
        encode_string(xdr, newname->len, newname->name);
}

static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
                         struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
        encode_uint64(xdr, clid);
}

static void
encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
}

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

        encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
        encode_nfs4_stateid(xdr, &zero_stateid);
        p = reserve_space(xdr, 2*4);
        *p++ = cpu_to_be32(1);
        *p = cpu_to_be32(FATTR4_WORD0_ACL);
        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);
}

static void
encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
}

static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
        encode_nfs4_stateid(xdr, &arg->stateid);
        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;

        encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
        encode_nfs4_verifier(xdr, setclientid->sc_verifier);

        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);
}

static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
                        decode_setclientid_confirm_maxsz, hdr);
        encode_uint64(xdr, arg->clientid);
        encode_nfs4_verifier(xdr, &arg->confirm);
}

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

        encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
        encode_nfs4_stateid(xdr, &args->stateid);

        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);
}

static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
        encode_nfs4_stateid(xdr, stateid);
}

static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
        encode_string(xdr, name->len, name->name);
}

#if defined(CONFIG_NFS_V4_1)
/* NFSv4.1 operations */
static void encode_bind_conn_to_session(struct xdr_stream *xdr,
                                   struct nfs4_session *session,
                                   struct compound_hdr *hdr)
{
        __be32 *p;

        encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
                decode_bind_conn_to_session_maxsz, hdr);
        encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
        p = xdr_reserve_space(xdr, 8);
        *p++ = cpu_to_be32(NFS4_CDFC4_BACK_OR_BOTH);
        *p = 0; /* use_conn_in_rdma_mode = False */
}

static void encode_exchange_id(struct xdr_stream *xdr,
                               struct nfs41_exchange_id_args *args,
                               struct compound_hdr *hdr)
{
        __be32 *p;
        char impl_name[IMPL_NAME_LIMIT];
        int len = 0;

        encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
        encode_nfs4_verifier(xdr, args->verifier);

        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 */

        if (send_implementation_id &&
            sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
            sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
                <= sizeof(impl_name) + 1)
                len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
                               utsname()->sysname, utsname()->release,
                               utsname()->version, utsname()->machine);

        if (len > 0) {
                *p = cpu_to_be32(1);    /* implementation id array length=1 */

                encode_string(xdr,
                        sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
                        CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
                encode_string(xdr, len, impl_name);
                /* just send zeros for nii_date - the date is in nii_name */
                p = reserve_space(xdr, 12);
                p = xdr_encode_hyper(p, 0);
                *p = cpu_to_be32(0);
        } else
                *p = cpu_to_be32(0);    /* implementation id array length=0 */
}

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;
        struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
        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);

        encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
        p = reserve_space(xdr, 16 + 2*28 + 20 + len + 12);
        p = xdr_encode_hyper(p, clp->cl_clientid);
        *p++ = cpu_to_be32(clp->cl_seqid);                      /*Sequence id */
        *p++ = cpu_to_be32(args->flags);                        /*flags */

        /* Fore Channel */
        *p++ = cpu_to_be32(0);                          /* 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(0);                          /* 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++ = (__be32)nn->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 */
}

static void encode_destroy_session(struct xdr_stream *xdr,
                                   struct nfs4_session *session,
                                   struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
        encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
}

static void encode_destroy_clientid(struct xdr_stream *xdr,
                                   uint64_t clientid,
                                   struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
        encode_uint64(xdr, clientid);
}

static void encode_reclaim_complete(struct xdr_stream *xdr,
                                    struct nfs41_reclaim_complete_args *args,
                                    struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
        encode_uint32(xdr, args->one_fs);
}
#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;
        struct nfs4_slot_table *tp;
        struct nfs4_slot *slot = args->sa_slot;
        __be32 *p;

        if (slot == NULL)
                return;

        tp = slot->table;
        session = tp->session;

        encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);

        /*
         * 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, slot->slot_nr,
                tp->highest_used_slotid, args->sa_cache_this);
        p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
        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(slot->slot_nr);
        *p++ = cpu_to_be32(tp->highest_used_slotid);
        *p = cpu_to_be32(args->sa_cache_this);
#endif /* CONFIG_NFS_V4_1 */
}

#ifdef CONFIG_NFS_V4_1
static void
encode_getdevicelist(struct xdr_stream *xdr,
                     const struct nfs4_getdevicelist_args *args,
                     struct compound_hdr *hdr)
{
        __be32 *p;
        nfs4_verifier dummy = {
                .data = "dummmmmy",
        };

        encode_op_hdr(xdr, OP_GETDEVICELIST, decode_getdevicelist_maxsz, hdr);
        p = reserve_space(xdr, 16);
        *p++ = cpu_to_be32(args->layoutclass);
        *p++ = cpu_to_be32(NFS4_PNFS_GETDEVLIST_MAXNUM);
        xdr_encode_hyper(p, 0ULL);                          /* cookie */
        encode_nfs4_verifier(xdr, &dummy);
}

static void
encode_getdeviceinfo(struct xdr_stream *xdr,
                     const struct nfs4_getdeviceinfo_args *args,
                     struct compound_hdr *hdr)
{
        __be32 *p;

        encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
        p = reserve_space(xdr, 12 + NFS4_DEVICEID4_SIZE);
        p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
                                    NFS4_DEVICEID4_SIZE);
        *p++ = cpu_to_be32(args->pdev->layout_type);
        *p++ = cpu_to_be32(args->pdev->pglen);          /* gdia_maxcount */
        *p++ = cpu_to_be32(0);                          /* bitmap length 0 */
}

static void
encode_layoutget(struct xdr_stream *xdr,
                      const struct nfs4_layoutget_args *args,
                      struct compound_hdr *hdr)
{
        __be32 *p;

        encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
        p = reserve_space(xdr, 36);
        *p++ = cpu_to_be32(0);     /* Signal layout available */
        *p++ = cpu_to_be32(args->type);
        *p++ = cpu_to_be32(args->range.iomode);
        p = xdr_encode_hyper(p, args->range.offset);
        p = xdr_encode_hyper(p, args->range.length);
        p = xdr_encode_hyper(p, args->minlength);
        encode_nfs4_stateid(xdr, &args->stateid);
        encode_uint32(xdr, args->maxcount);

        dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
                __func__,
                args->type,
                args->range.iomode,
                (unsigned long)args->range.offset,
                (unsigned long)args->range.length,
                args->maxcount);
}

static int
encode_layoutcommit(struct xdr_stream *xdr,
                    struct inode *inode,
                    const struct nfs4_layoutcommit_args *args,
                    struct compound_hdr *hdr)
{
        __be32 *p;

        dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
                NFS_SERVER(args->inode)->pnfs_curr_ld->id);

        encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
        p = reserve_space(xdr, 20);
        /* Only whole file layouts */
        p = xdr_encode_hyper(p, 0); /* offset */
        p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
        *p = cpu_to_be32(0); /* reclaim */
        encode_nfs4_stateid(xdr, &args->stateid);
        p = reserve_space(xdr, 20);
        *p++ = cpu_to_be32(1); /* newoffset = TRUE */
        p = xdr_encode_hyper(p, args->lastbytewritten);
        *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
        *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */

        if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
                NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
                        NFS_I(inode)->layout, xdr, args);
        else
                encode_uint32(xdr, 0); /* no layout-type payload */

        return 0;
}

static void
encode_layoutreturn(struct xdr_stream *xdr,
                    const struct nfs4_layoutreturn_args *args,
                    struct compound_hdr *hdr)
{
        __be32 *p;

        encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
        p = reserve_space(xdr, 16);
        *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
        *p++ = cpu_to_be32(args->layout_type);
        *p++ = cpu_to_be32(IOMODE_ANY);
        *p = cpu_to_be32(RETURN_FILE);
        p = reserve_space(xdr, 16);
        p = xdr_encode_hyper(p, 0);
        p = xdr_encode_hyper(p, NFS4_MAX_UINT64);
        spin_lock(&args->inode->i_lock);
        encode_nfs4_stateid(xdr, &args->stateid);
        spin_unlock(&args->inode->i_lock);
        if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
                NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
                        NFS_I(args->inode)->layout, xdr, args);
        } else
                encode_uint32(xdr, 0);
}

static int
encode_secinfo_no_name(struct xdr_stream *xdr,
                       const struct nfs41_secinfo_no_name_args *args,
                       struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
        encode_uint32(xdr, args->style);
        return 0;
}

static void encode_test_stateid(struct xdr_stream *xdr,
                                struct nfs41_test_stateid_args *args,
                                struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
        encode_uint32(xdr, 1);
        encode_nfs4_stateid(xdr, args->stateid);
}

static void encode_free_stateid(struct xdr_stream *xdr,
                                struct nfs41_free_stateid_args *args,
                                struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
        encode_nfs4_stateid(xdr, &args->stateid);
}
#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_slot)
                return args->sa_slot->table->session->clp->cl_mvops->minor_version;
#endif /* CONFIG_NFS_V4_1 */
        return 0;
}

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

        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);
}

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

        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);
}

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

        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);
}

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

        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_nops(&hdr);
}

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

        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_nops(&hdr);
}

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

        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_restorefh(xdr, &hdr);
        encode_getfattr(xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, args->dir_fh, &hdr);
        encode_create(xdr, args, &hdr);
        encode_getfh(xdr, &hdr);
        encode_getfattr(xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode SYMLINK request
 */
static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
                                 const struct nfs4_create_arg *args)
{
        nfs4_xdr_enc_create(req, xdr, args);
}

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

        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);
}

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

        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);
}

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

        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_getfh(xdr, &hdr);
        if (args->access)
                encode_access(xdr, args->access, &hdr);
        encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_putfh(xdr, args->fh, &hdr);
        encode_open_confirm(xdr, args, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, args->fh, &hdr);
        encode_open(xdr, args, &hdr);
        if (args->access)
                encode_access(xdr, args->access, &hdr);
        encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
        encode_nops(&hdr);
}

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

        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);
}

/*
 * Encode a LOCK request
 */
static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
                              struct nfs_lock_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        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);
}

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

        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);
}

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

        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);
}

static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
                                           struct xdr_stream *xdr,
                                        struct nfs_release_lockowner_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = 0,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_release_lockowner(xdr, &args->lock_owner, &hdr);
        encode_nops(&hdr);
}

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

        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);
}

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

        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);
}

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

        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);
}

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

        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);
}

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

        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 + 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);
}

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

        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;
        if (args->bitmask)
                encode_getfattr(xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
}

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

        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_nops(&hdr);
}

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

        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);
}

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

        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);
}

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

        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);
}

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

        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_FH_EXPIRE_TYPE|
                           FATTR4_WORD0_LINK_SUPPORT|
                           FATTR4_WORD0_SYMLINK_SUPPORT|
                           FATTR4_WORD0_ACLSUPPORT, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_renew(xdr, clp->cl_clientid, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_setclientid(xdr, sc, &hdr);
        encode_nops(&hdr);
}

/*
 * a SETCLIENTID_CONFIRM request
 */
static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
                                             struct xdr_stream *xdr,
                                             struct nfs4_setclientid_res *arg)
{
        struct compound_hdr hdr = {
                .nops   = 0,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_setclientid_confirm(xdr, arg, &hdr);
        encode_nops(&hdr);
}

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

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

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

        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);
}

/*
 * Encode SECINFO request
 */
static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
                                struct xdr_stream *xdr,
                                struct nfs4_secinfo_arg *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, args->dir_fh, &hdr);
        encode_secinfo(xdr, args->name, &hdr);
        encode_nops(&hdr);
}

#if defined(CONFIG_NFS_V4_1)
/*
 * BIND_CONN_TO_SESSION request
 */
static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
                                struct xdr_stream *xdr,
                                struct nfs_client *clp)
{
        struct compound_hdr hdr = {
                .minorversion = clp->cl_mvops->minor_version,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_bind_conn_to_session(xdr, clp->cl_session, &hdr);
        encode_nops(&hdr);
}

/*
 * EXCHANGE_ID request
 */
static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
                                     struct xdr_stream *xdr,
                                     struct nfs41_exchange_id_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = args->client->cl_mvops->minor_version,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_exchange_id(xdr, args, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_create_session(xdr, args, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_destroy_session(xdr, session, &hdr);
        encode_nops(&hdr);
}

/*
 * a DESTROY_CLIENTID request
 */
static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
                                         struct xdr_stream *xdr,
                                         struct nfs_client *clp)
{
        struct compound_hdr hdr = {
                .minorversion = clp->cl_mvops->minor_version,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
        encode_nops(&hdr);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 * a GET_LEASE_TIME request
 */
static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
                                        struct xdr_stream *xdr,
                                        struct nfs4_get_lease_time_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
        };
        const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };

        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);
}

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

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_reclaim_complete(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode GETDEVICELIST request
 */
static void nfs4_xdr_enc_getdevicelist(struct rpc_rqst *req,
                                       struct xdr_stream *xdr,
                                       struct nfs4_getdevicelist_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, args->fh, &hdr);
        encode_getdevicelist(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode GETDEVICEINFO request
 */
static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
                                       struct xdr_stream *xdr,
                                       struct nfs4_getdeviceinfo_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_getdeviceinfo(xdr, args, &hdr);

        /* set up reply kvec. Subtract notification bitmap max size (2)
         * so that notification bitmap is put in xdr_buf tail */
        xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
                         args->pdev->pages, args->pdev->pgbase,
                         args->pdev->pglen);

        encode_nops(&hdr);
}

/*
 *  Encode LAYOUTGET request
 */
static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
                                   struct xdr_stream *xdr,
                                   struct nfs4_layoutget_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, NFS_FH(args->inode), &hdr);
        encode_layoutget(xdr, args, &hdr);

        xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
            args->layout.pages, 0, args->layout.pglen);

        encode_nops(&hdr);
}

/*
 *  Encode LAYOUTCOMMIT request
 */
static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      struct nfs4_layoutcommit_args *args)
{
        struct nfs4_layoutcommit_data *data =
                container_of(args, struct nfs4_layoutcommit_data, args);
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, NFS_FH(args->inode), &hdr);
        encode_layoutcommit(xdr, data->args.inode, args, &hdr);
        encode_getfattr(xdr, args->bitmask, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode LAYOUTRETURN request
 */
static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      struct nfs4_layoutreturn_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putfh(xdr, NFS_FH(args->inode), &hdr);
        encode_layoutreturn(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode SECINFO_NO_NAME request
 */
static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
                                        struct xdr_stream *xdr,
                                        struct nfs41_secinfo_no_name_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_putrootfh(xdr, &hdr);
        encode_secinfo_no_name(xdr, args, &hdr);
        encode_nops(&hdr);
        return 0;
}

/*
 *  Encode TEST_STATEID request
 */
static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      struct nfs41_test_stateid_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_test_stateid(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 *  Encode FREE_STATEID request
 */
static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
                                     struct xdr_stream *xdr,
                                     struct nfs41_free_stateid_args *args)
{
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_sequence(xdr, &args->seq_args, &hdr);
        encode_free_stateid(xdr, args, &hdr);
        encode_nops(&hdr);
}
#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: