nfs4xdr.c

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/*
 *  fs/nfs/nfs4xdr.c
 *
 *  Client-side XDR for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <[email protected]>
 *  Andy Adamson   <[email protected]>
 *
 *  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 "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 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(NFS4_OPAQUE_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 + \
                encode_putrootfh_maxsz + \
                encode_fsinfo_maxsz)
#define NFS4_dec_setclientid_confirm_sz \
                (compound_decode_hdr_maxsz + \
                decode_setclientid_confirm_maxsz + \
                decode_putrootfh_maxsz + \
                decode_fsinfo_maxsz)
#define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
                encode_sequence_maxsz + \
                encode_putfh_maxsz + \
                encode_lock_maxsz)
#define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
                decode_sequence_maxsz + \
                decode_putfh_maxsz + \
                decode_lock_maxsz)
#define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
                encode_sequence_maxsz + \
                encode_putfh_maxsz + \
                encode_lockt_maxsz)
#define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
                 decode_sequence_maxsz + \
                 decode_putfh_maxsz + \
                 decode_lockt_maxsz)
#define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
                encode_sequence_maxsz + \
                encode_putfh_maxsz + \
                encode_locku_maxsz)
#define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
                decode_sequence_maxsz + \
                decode_putfh_maxsz + \
                decode_locku_maxsz)
#define NFS4_enc_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;

    BUG_ON(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)
{
    BUG_ON(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",
                    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",
                    iap->ia_gid);
            strcpy(owner_group, "nobody");
            owner_grouplen = sizeof("nobody") - 1;
            /* goto out; */
        }
        len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
    }
    if (iap->ia_valid & ATTR_ATIME_SET)
        len += 16;
    else if (iap->ia_valid & ATTR_ATIME)
        len += 4;
    if (iap->ia_valid & ATTR_MTIME_SET)
        len += 16;
    else if (iap->ia_valid & ATTR_MTIME)
        len += 4;
    p = reserve_space(xdr, len);

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

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

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

/* out: */
}

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

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

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

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

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

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

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

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

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

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

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

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

    p = reserve_space(xdr, 4);
    *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
    encode_nfs4_stateid(xdr, stateid);
    encode_string(xdr, name->len, name->name);
}

static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
{
    encode_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;
    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_open_stateid(struct xdr_stream *xdr,
        const struct nfs_open_context *ctx,
        const struct nfs_lock_context *l_ctx,
        fmode_t fmode,
        int zero_seqid)
{
    nfs4_stateid stateid;

    if (ctx->state != NULL) {
        const struct nfs_lockowner *lockowner = NULL;

        if (l_ctx != NULL)
            lockowner = &l_ctx->lockowner;
        nfs4_select_rw_stateid(&stateid, ctx->state,
                fmode, lockowner);
        if (zero_seqid)
            stateid.seqid = 0;
        encode_nfs4_stateid(xdr, &stateid);
    } else
        encode_nfs4_stateid(xdr, &zero_stateid);
}

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_open_stateid(xdr, args->context, args->lock_context,
            FMODE_READ, hdr->minorversion);

    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);
    BUG_ON(arg->acl_len % 4);
    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_open_stateid(xdr, args->context, args->lock_context,
            FMODE_WRITE, hdr->minorversion);

    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[NFS4_OPAQUE_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)
        <= NFS4_OPAQUE_LIMIT + 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 = args->sa_session;
    struct nfs4_slot_table *tp;
    struct nfs4_slot *slot;
    __be32 *p;

    if (!session)
        return;

    tp = &session->fc_slot_table;

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

    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, args->sa_slotid,
        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(args->sa_slotid);
    *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_session)
        return args->sa_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,
    };
    const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };

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

/*
 * 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:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

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

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

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

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

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

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

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

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

static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
{
    if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
        int ret;
        ret = decode_attr_bitmap(xdr, bitmask);
        if (unlikely(ret < 0))
            return ret;
        bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
    } else
        bitmask[0] = bitmask[1] = bitmask[2] = 0;
    dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
        bitmask[0], bitmask[1], bitmask[2]);
    return 0;
}

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

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

static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
                      uint32_t *bitmap, uint32_t *type)
{
    __be32 *p;

    *type = 0;
    if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        *type = be32_to_cpup(p);
        bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
    }
    dprintk("%s: expire type=0x%x\n", __func__, *type);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

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

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

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

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

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

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

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

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

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

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

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

static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
{
    __be32 *p;

    if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
        *res = -be32_to_cpup(p);
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
{
    __be32 *p;
    int len;

    if (fh != NULL)
        memset(fh, 0, sizeof(*fh));

    if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        len = be32_to_cpup(p);
        if (len > NFS4_FHSIZE)
            return -EIO;
        p = xdr_inline_decode(xdr, len);
        if (unlikely(!p))
            goto out_overflow;
        if (fh != NULL) {
            memcpy(fh->data, p, len);
            fh->size = len;
        }
        bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    n = be32_to_cpup(p);
    if (n == 0)
        goto root_path;
    dprintk("pathname4: ");
    path->ncomponents = 0;
    while (path->ncomponents < n) {
        struct nfs4_string *component = &path->components[path->ncomponents];
        status = decode_opaque_inline(xdr, &component->len, &component->data);
        if (unlikely(status != 0))
            goto out_eio;
        ifdebug (XDR)
            pr_cont("%s%.*s ",
                (path->ncomponents != n ? "/ " : ""),
                component->len, component->data);
        if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
            path->ncomponents++;
        else {
            dprintk("cannot parse %d components in path\n", n);
            goto out_eio;
        }
    }
out:
    return status;
root_path:
/* a root pathname is sent as a zero component4 */
    path->ncomponents = 1;
    path->components[0].len=0;
    path->components[0].data=NULL;
    dprintk("pathname4: /\n");
    goto out;
out_eio:
    dprintk(" status %d", status);
    status = -EIO;
    goto out;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
        goto out;
    status = 0;
    if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
        goto out;
    status = -EIO;
    /* Ignore borken servers that return unrequested attrs */
    if (unlikely(res == NULL))
        goto out;
    dprintk("%s: fsroot:\n", __func__);
    status = decode_pathname(xdr, &res->fs_path);
    if (unlikely(status != 0))
        goto out;
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    n = be32_to_cpup(p);
    if (n <= 0)
        goto out_eio;
    res->nlocations = 0;
    while (res->nlocations < n) {
        u32 m;
        struct nfs4_fs_location *loc = &res->locations[res->nlocations];

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

        loc->nservers = 0;
        dprintk("%s: servers:\n", __func__);
        while (loc->nservers < m) {
            struct nfs4_string *server = &loc->servers[loc->nservers];
            status = decode_opaque_inline(xdr, &server->len, &server->data);
            if (unlikely(status != 0))
                goto out_eio;
            dprintk("%s ", server->data);
            if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
                loc->nservers++;
            else {
                unsigned int i;
                dprintk("%s: using first %u of %u servers "
                    "returned for location %u\n",
                        __func__,
                        NFS4_FS_LOCATION_MAXSERVERS,
                        m, res->nlocations);
                for (i = loc->nservers; i < m; i++) {
                    unsigned int len;
                    char *data;
                    status = decode_opaque_inline(xdr, &len, &data);
                    if (unlikely(status != 0))
                        goto out_eio;
                }
            }
        }
        status = decode_pathname(xdr, &loc->rootpath);
        if (unlikely(status != 0))
            goto out_eio;
        if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
            res->nlocations++;
    }
    if (res->nlocations != 0)
        status = NFS_ATTR_FATTR_V4_LOCATIONS;
out:
    dprintk("%s: fs_locations done, error = %d\n", __func__, status);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
out_eio:
    status = -EIO;
    goto out;
}

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

    *res = 0;
    if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, res);
        bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
    }
    dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
{
    __be32 *p;
    int status = 0;

    *maxlink = 1;
    if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        *maxlink = be32_to_cpup(p);
        bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
    }
    dprintk("%s: maxlink=%u\n", __func__, *maxlink);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
{
    __be32 *p;
    int status = 0;

    *maxname = 1024;
    if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        *maxname = be32_to_cpup(p);
        bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
    }
    dprintk("%s: maxname=%u\n", __func__, *maxname);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *res = 1024;
    if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
        uint64_t maxread;
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, &maxread);
        if (maxread > 0x7FFFFFFF)
            maxread = 0x7FFFFFFF;
        *res = (uint32_t)maxread;
        bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
    }
    dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *res = 1024;
    if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
        uint64_t maxwrite;
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, &maxwrite);
        if (maxwrite > 0x7FFFFFFF)
            maxwrite = 0x7FFFFFFF;
        *res = (uint32_t)maxwrite;
        bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
    }
    dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
{
    uint32_t tmp;
    __be32 *p;
    int ret = 0;

    *mode = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        tmp = be32_to_cpup(p);
        *mode = tmp & ~S_IFMT;
        bitmap[1] &= ~FATTR4_WORD1_MODE;
        ret = NFS_ATTR_FATTR_MODE;
    }
    dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
    return ret;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *nlink = 1;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        *nlink = be32_to_cpup(p);
        bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
        ret = NFS_ATTR_FATTR_NLINK;
    }
    dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
    return ret;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
        const struct nfs_server *server, uint32_t *uid,
        struct nfs4_string *owner_name)
{
    uint32_t len;
    __be32 *p;
    int ret = 0;

    *uid = -2;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
        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;
        if (owner_name != NULL) {
            owner_name->data = kmemdup(p, len, GFP_NOWAIT);
            if (owner_name->data != NULL) {
                owner_name->len = len;
                ret = NFS_ATTR_FATTR_OWNER_NAME;
            }
        } else if (len < XDR_MAX_NETOBJ) {
            if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
                ret = NFS_ATTR_FATTR_OWNER;
            else
                dprintk("%s: nfs_map_name_to_uid failed!\n",
                        __func__);
        } else
            dprintk("%s: name too long (%u)!\n",
                    __func__, len);
        bitmap[1] &= ~FATTR4_WORD1_OWNER;
    }
    dprintk("%s: uid=%d\n", __func__, (int)*uid);
    return ret;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
        const struct nfs_server *server, uint32_t *gid,
        struct nfs4_string *group_name)
{
    uint32_t len;
    __be32 *p;
    int ret = 0;

    *gid = -2;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
        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;
        if (group_name != NULL) {
            group_name->data = kmemdup(p, len, GFP_NOWAIT);
            if (group_name->data != NULL) {
                group_name->len = len;
                ret = NFS_ATTR_FATTR_GROUP_NAME;
            }
        } else if (len < XDR_MAX_NETOBJ) {
            if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
                ret = NFS_ATTR_FATTR_GROUP;
            else
                dprintk("%s: nfs_map_group_to_gid failed!\n",
                        __func__);
        } else
            dprintk("%s: name too long (%u)!\n",
                    __func__, len);
        bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
    }
    dprintk("%s: gid=%d\n", __func__, (int)*gid);
    return ret;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
{
    uint32_t major = 0, minor = 0;
    __be32 *p;
    int ret = 0;

    *rdev = MKDEV(0,0);
    if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
        dev_t tmp;

        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        major = be32_to_cpup(p++);
        minor = be32_to_cpup(p);
        tmp = MKDEV(major, minor);
        if (MAJOR(tmp) == major && MINOR(tmp) == minor)
            *rdev = tmp;
        bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
        ret = NFS_ATTR_FATTR_RDEV;
    }
    dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
    return ret;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *res = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, res);
        bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
    }
    dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *res = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, res);
        bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
    }
    dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *res = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, res);
        bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
    }
    dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

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

    *used = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, used);
        bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
        ret = NFS_ATTR_FATTR_SPACE_USED;
    }
    dprintk("%s: space used=%Lu\n", __func__,
            (unsigned long long)*used);
    return ret;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
{
    __be32 *p;
    uint64_t sec;
    uint32_t nsec;

    p = xdr_inline_decode(xdr, 12);
    if (unlikely(!p))
        goto out_overflow;
    p = xdr_decode_hyper(p, &sec);
    nsec = be32_to_cpup(p);
    time->tv_sec = (time_t)sec;
    time->tv_nsec = (long)nsec;
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
{
    int status = 0;

    time->tv_sec = 0;
    time->tv_nsec = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
        status = decode_attr_time(xdr, time);
        if (status == 0)
            status = NFS_ATTR_FATTR_ATIME;
        bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
    }
    dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
    return status;
}

static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
{
    int status = 0;

    time->tv_sec = 0;
    time->tv_nsec = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
        status = decode_attr_time(xdr, time);
        if (status == 0)
            status = NFS_ATTR_FATTR_CTIME;
        bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
    }
    dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
    return status;
}

static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
                  struct timespec *time)
{
    int status = 0;

    time->tv_sec = 0;
    time->tv_nsec = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
        status = decode_attr_time(xdr, time);
        bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
    }
    dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
        (long)time->tv_nsec);
    return status;
}

static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
{
    int status = 0;

    time->tv_sec = 0;
    time->tv_nsec = 0;
    if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
        return -EIO;
    if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
        status = decode_attr_time(xdr, time);
        if (status == 0)
            status = NFS_ATTR_FATTR_MTIME;
        bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
    }
    dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
    return status;
}

static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
{
    unsigned int attrwords = XDR_QUADLEN(attrlen);
    unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;

    if (unlikely(attrwords != nwords)) {
        dprintk("%s: server returned incorrect attribute length: "
            "%u %c %u\n",
                __func__,
                attrwords << 2,
                (attrwords < nwords) ? '<' : '>',
                nwords << 2);
        return -EIO;
    }
    return 0;
}

static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 20);
    if (unlikely(!p))
        goto out_overflow;
    cinfo->atomic = be32_to_cpup(p++);
    p = xdr_decode_hyper(p, &cinfo->before);
    xdr_decode_hyper(p, &cinfo->after);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
{
    __be32 *p;
    uint32_t supp, acc;
    int status;

    status = decode_op_hdr(xdr, OP_ACCESS);
    if (status)
        return status;
    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    supp = be32_to_cpup(p++);
    acc = be32_to_cpup(p);
    *supported = supp;
    *access = acc;
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, len);
    if (likely(p)) {
        memcpy(buf, p, len);
        return 0;
    }
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
    return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
}

static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
{
    int status;

    status = decode_op_hdr(xdr, OP_CLOSE);
    if (status != -EIO)
        nfs_increment_open_seqid(status, res->seqid);
    if (!status)
        status = decode_stateid(xdr, &res->stateid);
    return status;
}

static int decode_verifier(struct xdr_stream *xdr, void *verifier)
{
    return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
}

static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
{
    return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
}

static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
{
    int status;

    status = decode_op_hdr(xdr, OP_COMMIT);
    if (!status)
        status = decode_write_verifier(xdr, &res->verf->verifier);
    return status;
}

static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
    __be32 *p;
    uint32_t bmlen;
    int status;

    status = decode_op_hdr(xdr, OP_CREATE);
    if (status)
        return status;
    if ((status = decode_change_info(xdr, cinfo)))
        return status;
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    bmlen = be32_to_cpup(p);
    p = xdr_inline_decode(xdr, bmlen << 2);
    if (likely(p))
        return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
{
    unsigned int savep;
    uint32_t attrlen, bitmap[3] = {0};
    int status;

    if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
        goto xdr_error;
    if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
        goto xdr_error;
    if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
        goto xdr_error;
    if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
        goto xdr_error;
    if ((status = decode_attr_fh_expire_type(xdr, bitmap,
                         &res->fh_expire_type)) != 0)
        goto xdr_error;
    if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
        goto xdr_error;
    if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
        goto xdr_error;
    if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
        goto xdr_error;
    status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
    dprintk("%s: xdr returned %d!\n", __func__, -status);
    return status;
}

static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
{
    unsigned int savep;
    uint32_t attrlen, bitmap[3] = {0};
    int status;

    if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
        goto xdr_error;
    if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
        goto xdr_error;
    if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
        goto xdr_error;

    if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
        goto xdr_error;
    if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
        goto xdr_error;
    if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
        goto xdr_error;
    if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
        goto xdr_error;
    if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
        goto xdr_error;
    if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
        goto xdr_error;

    status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
    dprintk("%s: xdr returned %d!\n", __func__, -status);
    return status;
}

static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
{
    unsigned int savep;
    uint32_t attrlen, bitmap[3] = {0};
    int status;

    if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
        goto xdr_error;
    if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
        goto xdr_error;
    if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
        goto xdr_error;

    if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
        goto xdr_error;
    if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
        goto xdr_error;

    status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
    dprintk("%s: xdr returned %d!\n", __func__, -status);
    return status;
}

static int decode_threshold_hint(struct xdr_stream *xdr,
                  uint32_t *bitmap,
                  uint64_t *res,
                  uint32_t hint_bit)
{
    __be32 *p;

    *res = 0;
    if (likely(bitmap[0] & hint_bit)) {
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
        xdr_decode_hyper(p, res);
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_first_threshold_item4(struct xdr_stream *xdr,
                    struct nfs4_threshold *res)
{
    __be32 *p;
    unsigned int savep;
    uint32_t bitmap[3] = {0,}, attrlen;
    int status;

    /* layout type */
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p)) {
        print_overflow_msg(__func__, xdr);
        return -EIO;
    }
    res->l_type = be32_to_cpup(p);

    /* thi_hintset bitmap */
    status = decode_attr_bitmap(xdr, bitmap);
    if (status < 0)
        goto xdr_error;

    /* thi_hintlist length */
    status = decode_attr_length(xdr, &attrlen, &savep);
    if (status < 0)
        goto xdr_error;
    /* thi_hintlist */
    status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
    if (status < 0)
        goto xdr_error;
    status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
    if (status < 0)
        goto xdr_error;
    status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
                       THRESHOLD_RD_IO);
    if (status < 0)
        goto xdr_error;
    status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
                       THRESHOLD_WR_IO);
    if (status < 0)
        goto xdr_error;

    status = verify_attr_len(xdr, savep, attrlen);
    res->bm = bitmap[0];

    dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
         __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
        res->wr_io_sz);
xdr_error:
    dprintk("%s ret=%d!\n", __func__, status);
    return status;
}

/*
 * Thresholds on pNFS direct I/O vrs MDS I/O
 */
static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
                    uint32_t *bitmap,
                    struct nfs4_threshold *res)
{
    __be32 *p;
    int status = 0;
    uint32_t num;

    if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
        return -EIO;
    if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
        /* Did the server return an unrequested attribute? */
        if (unlikely(res == NULL))
            return -EREMOTEIO;
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        num = be32_to_cpup(p);
        if (num == 0)
            return 0;
        if (num > 1)
            printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
                "drivers per filesystem not supported\n",
                __func__);

        status = decode_first_threshold_item4(xdr, res);
        bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
    }
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
        struct nfs_fattr *fattr, struct nfs_fh *fh,
        struct nfs4_fs_locations *fs_loc,
        const struct nfs_server *server)
{
    int status;
    umode_t fmode = 0;
    uint32_t type;
    int32_t err;

    status = decode_attr_type(xdr, bitmap, &type);
    if (status < 0)
        goto xdr_error;
    fattr->mode = 0;
    if (status != 0) {
        fattr->mode |= nfs_type2fmt[type];
        fattr->valid |= status;
    }

    status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_size(xdr, bitmap, &fattr->size);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    err = 0;
    status = decode_attr_error(xdr, bitmap, &err);
    if (status < 0)
        goto xdr_error;

    status = decode_attr_filehandle(xdr, bitmap, fh);
    if (status < 0)
        goto xdr_error;

    status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_mode(xdr, bitmap, &fmode);
    if (status < 0)
        goto xdr_error;
    if (status != 0) {
        fattr->mode |= fmode;
        fattr->valid |= status;
    }

    status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
    if (status < 0)
        goto xdr_error;
    fattr->valid |= status;

    status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
    if (status < 0)
        goto xdr_error;

xdr_error:
    dprintk("%s: xdr returned %d\n", __func__, -status);
    return status;
}

static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
        struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
        const struct nfs_server *server)
{
    unsigned int savep;
    uint32_t attrlen,
         bitmap[3] = {0};
    int status;

    status = decode_op_hdr(xdr, OP_GETATTR);
    if (status < 0)
        goto xdr_error;

    status = decode_attr_bitmap(xdr, bitmap);
    if (status < 0)
        goto xdr_error;

    status = decode_attr_length(xdr, &attrlen, &savep);
    if (status < 0)
        goto xdr_error;

    status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc, server);
    if (status < 0)
        goto xdr_error;

    status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
    dprintk("%s: xdr returned %d\n", __func__, -status);
    return status;
}

static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
        const struct nfs_server *server)
{
    return decode_getfattr_generic(xdr, fattr, NULL, NULL, server);
}

/*
 * Decode potentially multiple layout types. Currently we only support
 * one layout driver per file system.
 */
static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
                     uint32_t *layouttype)
{
    uint32_t *p;
    int num;

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

    /* pNFS is not supported by the underlying file system */
    if (num == 0) {
        *layouttype = 0;
        return 0;
    }
    if (num > 1)
        printk(KERN_INFO "NFS: %s: Warning: Multiple pNFS layout "
            "drivers per filesystem not supported\n", __func__);

    /* Decode and set first layout type, move xdr->p past unused types */
    p = xdr_inline_decode(xdr, num * 4);
    if (unlikely(!p))
        goto out_overflow;
    *layouttype = be32_to_cpup(p);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

/*
 * The type of file system exported.
 * Note we must ensure that layouttype is set in any non-error case.
 */
static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
                uint32_t *layouttype)
{
    int status = 0;

    dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
    if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
        return -EIO;
    if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
        status = decode_first_pnfs_layout_type(xdr, layouttype);
        bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
    } else
        *layouttype = 0;
    return status;
}

/*
 * The prefered block size for layout directed io
 */
static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
                      uint32_t *res)
{
    __be32 *p;

    dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
    *res = 0;
    if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p)) {
            print_overflow_msg(__func__, xdr);
            return -EIO;
        }
        *res = be32_to_cpup(p);
        bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
    }
    return 0;
}

static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
{
    unsigned int savep;
    uint32_t attrlen, bitmap[3];
    int status;

    if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
        goto xdr_error;
    if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
        goto xdr_error;
    if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
        goto xdr_error;

    fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */

    if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
        goto xdr_error;
    if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
        goto xdr_error;
    if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
        goto xdr_error;
    fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
    if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
        goto xdr_error;
    fsinfo->wtpref = fsinfo->wtmax;
    status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
    if (status != 0)
        goto xdr_error;
    status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
    if (status != 0)
        goto xdr_error;
    status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
    if (status)
        goto xdr_error;

    status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
    dprintk("%s: xdr returned %d!\n", __func__, -status);
    return status;
}

static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
{
    __be32 *p;
    uint32_t len;
    int status;

    /* Zero handle first to allow comparisons */
    memset(fh, 0, sizeof(*fh));

    status = decode_op_hdr(xdr, OP_GETFH);
    if (status)
        return status;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    len = be32_to_cpup(p);
    if (len > NFS4_FHSIZE)
        return -EIO;
    fh->size = len;
    p = xdr_inline_decode(xdr, len);
    if (unlikely(!p))
        goto out_overflow;
    memcpy(fh->data, p, len);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
    int status;

    status = decode_op_hdr(xdr, OP_LINK);
    if (status)
        return status;
    return decode_change_info(xdr, cinfo);
}

/*
 * We create the owner, so we know a proper owner.id length is 4.
 */
static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
{
    uint64_t offset, length, clientid;
    __be32 *p;
    uint32_t namelen, type;

    p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
    if (unlikely(!p))
        goto out_overflow;
    p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
    p = xdr_decode_hyper(p, &length);
    type = be32_to_cpup(p++); /* 4 byte read */
    if (fl != NULL) { /* manipulate file lock */
        fl->fl_start = (loff_t)offset;
        fl->fl_end = fl->fl_start + (loff_t)length - 1;
        if (length == ~(uint64_t)0)
            fl->fl_end = OFFSET_MAX;
        fl->fl_type = F_WRLCK;
        if (type & 1)
            fl->fl_type = F_RDLCK;
        fl->fl_pid = 0;
    }
    p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
    namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
    p = xdr_inline_decode(xdr, namelen); /* variable size field */
    if (likely(p))
        return -NFS4ERR_DENIED;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
{
    int status;

    status = decode_op_hdr(xdr, OP_LOCK);
    if (status == -EIO)
        goto out;
    if (status == 0) {
        status = decode_stateid(xdr, &res->stateid);
        if (unlikely(status))
            goto out;
    } else if (status == -NFS4ERR_DENIED)
        status = decode_lock_denied(xdr, NULL);
    if (res->open_seqid != NULL)
        nfs_increment_open_seqid(status, res->open_seqid);
    nfs_increment_lock_seqid(status, res->lock_seqid);
out:
    return status;
}

static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
{
    int status;
    status = decode_op_hdr(xdr, OP_LOCKT);
    if (status == -NFS4ERR_DENIED)
        return decode_lock_denied(xdr, res->denied);
    return status;
}

static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
{
    int status;

    status = decode_op_hdr(xdr, OP_LOCKU);
    if (status != -EIO)
        nfs_increment_lock_seqid(status, res->seqid);
    if (status == 0)
        status = decode_stateid(xdr, &res->stateid);
    return status;
}

static int decode_release_lockowner(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
}

static int decode_lookup(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_LOOKUP);
}

/* This is too sick! */
static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
{
    __be32 *p;
    uint32_t limit_type, nblocks, blocksize;

    p = xdr_inline_decode(xdr, 12);
    if (unlikely(!p))
        goto out_overflow;
    limit_type = be32_to_cpup(p++);
    switch (limit_type) {
    case 1:
        xdr_decode_hyper(p, maxsize);
        break;
    case 2:
        nblocks = be32_to_cpup(p++);
        blocksize = be32_to_cpup(p);
        *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
{
    __be32 *p;
    uint32_t delegation_type;
    int status;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    delegation_type = be32_to_cpup(p);
    if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
        res->delegation_type = 0;
        return 0;
    }
    status = decode_stateid(xdr, &res->delegation);
    if (unlikely(status))
        return status;
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    res->do_recall = be32_to_cpup(p);

    switch (delegation_type) {
    case NFS4_OPEN_DELEGATE_READ:
        res->delegation_type = FMODE_READ;
        break;
    case NFS4_OPEN_DELEGATE_WRITE:
        res->delegation_type = FMODE_WRITE|FMODE_READ;
        if (decode_space_limit(xdr, &res->maxsize) < 0)
                return -EIO;
    }
    return decode_ace(xdr, NULL, res->server->nfs_client);
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
{
    __be32 *p;
    uint32_t savewords, bmlen, i;
    int status;

    status = decode_op_hdr(xdr, OP_OPEN);
    if (status != -EIO)
        nfs_increment_open_seqid(status, res->seqid);
    if (!status)
        status = decode_stateid(xdr, &res->stateid);
    if (unlikely(status))
        return status;

    decode_change_info(xdr, &res->cinfo);

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    res->rflags = be32_to_cpup(p++);
    bmlen = be32_to_cpup(p);
    if (bmlen > 10)
        goto xdr_error;

    p = xdr_inline_decode(xdr, bmlen << 2);
    if (unlikely(!p))
        goto out_overflow;
    savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
    for (i = 0; i < savewords; ++i)
        res->attrset[i] = be32_to_cpup(p++);
    for (; i < NFS4_BITMAP_SIZE; i++)
        res->attrset[i] = 0;

    return decode_delegation(xdr, res);
xdr_error:
    dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
    return -EIO;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
{
    int status;

    status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
    if (status != -EIO)
        nfs_increment_open_seqid(status, res->seqid);
    if (!status)
        status = decode_stateid(xdr, &res->stateid);
    return status;
}

static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
{
    int status;

    status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
    if (status != -EIO)
        nfs_increment_open_seqid(status, res->seqid);
    if (!status)
        status = decode_stateid(xdr, &res->stateid);
    return status;
}

static int decode_putfh(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_PUTFH);
}

static int decode_putrootfh(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_PUTROOTFH);
}

static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
{
    __be32 *p;
    uint32_t count, eof, recvd;
    int status;

    status = decode_op_hdr(xdr, OP_READ);
    if (status)
        return status;
    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    eof = be32_to_cpup(p++);
    count = be32_to_cpup(p);
    recvd = xdr_read_pages(xdr, count);
    if (count > recvd) {
        dprintk("NFS: server cheating in read reply: "
                "count %u > recvd %u\n", count, recvd);
        count = recvd;
        eof = 0;
    }
    res->eof = eof;
    res->count = count;
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
{
    int     status;
    __be32      verf[2];

    status = decode_op_hdr(xdr, OP_READDIR);
    if (!status)
        status = decode_verifier(xdr, readdir->verifier.data);
    if (unlikely(status))
        return status;
    memcpy(verf, readdir->verifier.data, sizeof(verf));
    dprintk("%s: verifier = %08x:%08x\n",
            __func__, verf[0], verf[1]);
    return xdr_read_pages(xdr, xdr->buf->page_len);
}

static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
{
    struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
    u32 len, recvd;
    __be32 *p;
    int status;

    status = decode_op_hdr(xdr, OP_READLINK);
    if (status)
        return status;

    /* Convert length of symlink */
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    len = be32_to_cpup(p);
    if (len >= rcvbuf->page_len || len <= 0) {
        dprintk("nfs: server returned giant symlink!\n");
        return -ENAMETOOLONG;
    }
    recvd = xdr_read_pages(xdr, len);
    if (recvd < len) {
        dprintk("NFS: server cheating in readlink reply: "
                "count %u > recvd %u\n", len, recvd);
        return -EIO;
    }
    /*
     * The XDR encode routine has set things up so that
     * the link text will be copied directly into the
     * buffer.  We just have to do overflow-checking,
     * and and null-terminate the text (the VFS expects
     * null-termination).
     */
    xdr_terminate_string(rcvbuf, len);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
    int status;

    status = decode_op_hdr(xdr, OP_REMOVE);
    if (status)
        goto out;
    status = decode_change_info(xdr, cinfo);
out:
    return status;
}

static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
          struct nfs4_change_info *new_cinfo)
{
    int status;

    status = decode_op_hdr(xdr, OP_RENAME);
    if (status)
        goto out;
    if ((status = decode_change_info(xdr, old_cinfo)))
        goto out;
    status = decode_change_info(xdr, new_cinfo);
out:
    return status;
}

static int decode_renew(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_RENEW);
}

static int
decode_restorefh(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_RESTOREFH);
}

static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
             struct nfs_getaclres *res)
{
    unsigned int savep;
    uint32_t attrlen,
         bitmap[3] = {0};
    int status;
    unsigned int pg_offset;

    res->acl_len = 0;
    if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
        goto out;

    xdr_enter_page(xdr, xdr->buf->page_len);

    /* Calculate the offset of the page data */
    pg_offset = xdr->buf->head[0].iov_len;

    if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
        goto out;
    if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
        goto out;

    if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
        return -EIO;
    if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {

        /* The bitmap (xdr len + bitmaps) and the attr xdr len words
         * are stored with the acl data to handle the problem of
         * variable length bitmaps.*/
        res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
        res->acl_len = attrlen;

        /* Check for receive buffer overflow */
        if (res->acl_len > (xdr->nwords << 2) ||
            res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
            res->acl_flags |= NFS4_ACL_TRUNC;
            dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
                    attrlen, xdr->nwords << 2);
        }
    } else
        status = -EOPNOTSUPP;

out:
    return status;
}

static int
decode_savefh(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_SAVEFH);
}

static int decode_setattr(struct xdr_stream *xdr)
{
    __be32 *p;
    uint32_t bmlen;
    int status;

    status = decode_op_hdr(xdr, OP_SETATTR);
    if (status)
        return status;
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    bmlen = be32_to_cpup(p);
    p = xdr_inline_decode(xdr, bmlen << 2);
    if (likely(p))
        return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
{
    __be32 *p;
    uint32_t opnum;
    int32_t nfserr;

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    opnum = be32_to_cpup(p++);
    if (opnum != OP_SETCLIENTID) {
        dprintk("nfs: decode_setclientid: Server returned operation"
            " %d\n", opnum);
        return -EIO;
    }
    nfserr = be32_to_cpup(p);
    if (nfserr == NFS_OK) {
        p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
        if (unlikely(!p))
            goto out_overflow;
        p = xdr_decode_hyper(p, &res->clientid);
        memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
    } else if (nfserr == NFSERR_CLID_INUSE) {
        uint32_t len;

        /* skip netid string */
        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;

        /* skip uaddr string */
        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;
        return -NFSERR_CLID_INUSE;
    } else
        return nfs4_stat_to_errno(nfserr);

    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_setclientid_confirm(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
}

static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
{
    __be32 *p;
    int status;

    status = decode_op_hdr(xdr, OP_WRITE);
    if (status)
        return status;

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    res->count = be32_to_cpup(p++);
    res->verf->committed = be32_to_cpup(p++);
    return decode_write_verifier(xdr, &res->verf->verifier);
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_delegreturn(struct xdr_stream *xdr)
{
    return decode_op_hdr(xdr, OP_DELEGRETURN);
}

static int decode_secinfo_gss(struct xdr_stream *xdr, struct nfs4_secinfo_flavor *flavor)
{
    __be32 *p;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    flavor->gss.sec_oid4.len = be32_to_cpup(p);
    if (flavor->gss.sec_oid4.len > GSS_OID_MAX_LEN)
        goto out_err;

    p = xdr_inline_decode(xdr, flavor->gss.sec_oid4.len);
    if (unlikely(!p))
        goto out_overflow;
    memcpy(flavor->gss.sec_oid4.data, p, flavor->gss.sec_oid4.len);

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    flavor->gss.qop4 = be32_to_cpup(p++);
    flavor->gss.service = be32_to_cpup(p);

    return 0;

out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
out_err:
    return -EINVAL;
}

static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
{
    struct nfs4_secinfo_flavor *sec_flavor;
    int status;
    __be32 *p;
    int i, num_flavors;

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

    res->flavors->num_flavors = 0;
    num_flavors = be32_to_cpup(p);

    for (i = 0; i < num_flavors; i++) {
        sec_flavor = &res->flavors->flavors[i];
        if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
            break;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        sec_flavor->flavor = be32_to_cpup(p);

        if (sec_flavor->flavor == RPC_AUTH_GSS) {
            status = decode_secinfo_gss(xdr, sec_flavor);
            if (status)
                goto out;
        }
        res->flavors->num_flavors++;
    }

    status = 0;
out:
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
{
    int status = decode_op_hdr(xdr, OP_SECINFO);
    if (status)
        return status;
    return decode_secinfo_common(xdr, res);
}

#if defined(CONFIG_NFS_V4_1)
static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
{
    int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
    if (status)
        return status;
    return decode_secinfo_common(xdr, res);
}

static int decode_exchange_id(struct xdr_stream *xdr,
                  struct nfs41_exchange_id_res *res)
{
    __be32 *p;
    uint32_t dummy;
    char *dummy_str;
    int status;
    uint32_t impl_id_count;

    status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
    if (status)
        return status;

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    xdr_decode_hyper(p, &res->clientid);
    p = xdr_inline_decode(xdr, 12);
    if (unlikely(!p))
        goto out_overflow;
    res->seqid = be32_to_cpup(p++);
    res->flags = be32_to_cpup(p++);

    /* We ask for SP4_NONE */
    dummy = be32_to_cpup(p);
    if (dummy != SP4_NONE)
        return -EIO;

    /* server_owner4.so_minor_id */
    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    p = xdr_decode_hyper(p, &res->server_owner->minor_id);

    /* server_owner4.so_major_id */
    status = decode_opaque_inline(xdr, &dummy, &dummy_str);
    if (unlikely(status))
        return status;
    if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
        return -EIO;
    memcpy(res->server_owner->major_id, dummy_str, dummy);
    res->server_owner->major_id_sz = dummy;

    /* server_scope4 */
    status = decode_opaque_inline(xdr, &dummy, &dummy_str);
    if (unlikely(status))
        return status;
    if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
        return -EIO;
    memcpy(res->server_scope->server_scope, dummy_str, dummy);
    res->server_scope->server_scope_sz = dummy;

    /* Implementation Id */
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    impl_id_count = be32_to_cpup(p++);

    if (impl_id_count) {
        /* nii_domain */
        status = decode_opaque_inline(xdr, &dummy, &dummy_str);
        if (unlikely(status))
            return status;
        if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
            return -EIO;
        memcpy(res->impl_id->domain, dummy_str, dummy);

        /* nii_name */
        status = decode_opaque_inline(xdr, &dummy, &dummy_str);
        if (unlikely(status))
            return status;
        if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
            return -EIO;
        memcpy(res->impl_id->name, dummy_str, dummy);

        /* nii_date */
        p = xdr_inline_decode(xdr, 12);
        if (unlikely(!p))
            goto out_overflow;
        p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
        res->impl_id->date.nseconds = be32_to_cpup(p);

        /* if there's more than one entry, ignore the rest */
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_chan_attrs(struct xdr_stream *xdr,
                 struct nfs4_channel_attrs *attrs)
{
    __be32 *p;
    u32 nr_attrs, val;

    p = xdr_inline_decode(xdr, 28);
    if (unlikely(!p))
        goto out_overflow;
    val = be32_to_cpup(p++);    /* headerpadsz */
    if (val)
        return -EINVAL;     /* no support for header padding yet */
    attrs->max_rqst_sz = be32_to_cpup(p++);
    attrs->max_resp_sz = be32_to_cpup(p++);
    attrs->max_resp_sz_cached = be32_to_cpup(p++);
    attrs->max_ops = be32_to_cpup(p++);
    attrs->max_reqs = be32_to_cpup(p++);
    nr_attrs = be32_to_cpup(p);
    if (unlikely(nr_attrs > 1)) {
        printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
            "count %u\n", __func__, nr_attrs);
        return -EINVAL;
    }
    if (nr_attrs == 1) {
        p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
        if (unlikely(!p))
            goto out_overflow;
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
{
    return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
}

static int decode_bind_conn_to_session(struct xdr_stream *xdr,
                struct nfs41_bind_conn_to_session_res *res)
{
    __be32 *p;
    int status;

    status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
    if (!status)
        status = decode_sessionid(xdr, &res->session->sess_id);
    if (unlikely(status))
        return status;

    /* dir flags, rdma mode bool */
    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;

    res->dir = be32_to_cpup(p++);
    if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
        return -EIO;
    if (be32_to_cpup(p) == 0)
        res->use_conn_in_rdma_mode = false;
    else
        res->use_conn_in_rdma_mode = true;

    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_create_session(struct xdr_stream *xdr,
                 struct nfs41_create_session_res *res)
{
    __be32 *p;
    int status;
    struct nfs_client *clp = res->client;
    struct nfs4_session *session = clp->cl_session;

    status = decode_op_hdr(xdr, OP_CREATE_SESSION);
    if (!status)
        status = decode_sessionid(xdr, &session->sess_id);
    if (unlikely(status))
        return status;

    /* seqid, flags */
    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    clp->cl_seqid = be32_to_cpup(p++);
    session->flags = be32_to_cpup(p);

    /* Channel attributes */
    status = decode_chan_attrs(xdr, &session->fc_attrs);
    if (!status)
        status = decode_chan_attrs(xdr, &session->bc_attrs);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
{
    return decode_op_hdr(xdr, OP_DESTROY_SESSION);
}

static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
{
    return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
}

static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
{
    return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
}
#endif /* CONFIG_NFS_V4_1 */

static int decode_sequence(struct xdr_stream *xdr,
               struct nfs4_sequence_res *res,
               struct rpc_rqst *rqstp)
{
#if defined(CONFIG_NFS_V4_1)
    struct nfs4_sessionid id;
    u32 dummy;
    int status;
    __be32 *p;

    if (!res->sr_session)
        return 0;

    status = decode_op_hdr(xdr, OP_SEQUENCE);
    if (!status)
        status = decode_sessionid(xdr, &id);
    if (unlikely(status))
        goto out_err;

    /*
     * If the server returns different values for sessionID, slotID or
     * sequence number, the server is looney tunes.
     */
    status = -EREMOTEIO;

    if (memcmp(id.data, res->sr_session->sess_id.data,
           NFS4_MAX_SESSIONID_LEN)) {
        dprintk("%s Invalid session id\n", __func__);
        goto out_err;
    }

    p = xdr_inline_decode(xdr, 20);
    if (unlikely(!p))
        goto out_overflow;

    /* seqid */
    dummy = be32_to_cpup(p++);
    if (dummy != res->sr_slot->seq_nr) {
        dprintk("%s Invalid sequence number\n", __func__);
        goto out_err;
    }
    /* slot id */
    dummy = be32_to_cpup(p++);
    if (dummy != res->sr_slot - res->sr_session->fc_slot_table.slots) {
        dprintk("%s Invalid slot id\n", __func__);
        goto out_err;
    }
    /* highest slot id - currently not processed */
    dummy = be32_to_cpup(p++);
    /* target highest slot id - currently not processed */
    dummy = be32_to_cpup(p++);
    /* result flags */
    res->sr_status_flags = be32_to_cpup(p);
    status = 0;
out_err:
    res->sr_status = status;
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    status = -EIO;
    goto out_err;
#else  /* CONFIG_NFS_V4_1 */
    return 0;
#endif /* CONFIG_NFS_V4_1 */
}

#if defined(CONFIG_NFS_V4_1)
/*
 * TODO: Need to handle case when EOF != true;
 */
static int decode_getdevicelist(struct xdr_stream *xdr,
                struct pnfs_devicelist *res)
{
    __be32 *p;
    int status, i;
    nfs4_verifier verftemp;

    status = decode_op_hdr(xdr, OP_GETDEVICELIST);
    if (status)
        return status;

    p = xdr_inline_decode(xdr, 8 + 8 + 4);
    if (unlikely(!p))
        goto out_overflow;

    /* TODO: Skip cookie for now */
    p += 2;

    /* Read verifier */
    p = xdr_decode_opaque_fixed(p, verftemp.data, NFS4_VERIFIER_SIZE);

    res->num_devs = be32_to_cpup(p);

    dprintk("%s: num_dev %d\n", __func__, res->num_devs);

    if (res->num_devs > NFS4_PNFS_GETDEVLIST_MAXNUM) {
        printk(KERN_ERR "NFS: %s too many result dev_num %u\n",
                __func__, res->num_devs);
        return -EIO;
    }

    p = xdr_inline_decode(xdr,
                  res->num_devs * NFS4_DEVICEID4_SIZE + 4);
    if (unlikely(!p))
        goto out_overflow;
    for (i = 0; i < res->num_devs; i++)
        p = xdr_decode_opaque_fixed(p, res->dev_id[i].data,
                        NFS4_DEVICEID4_SIZE);
    res->eof = be32_to_cpup(p);
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_getdeviceinfo(struct xdr_stream *xdr,
                struct pnfs_device *pdev)
{
    __be32 *p;
    uint32_t len, type;
    int status;

    status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
    if (status) {
        if (status == -ETOOSMALL) {
            p = xdr_inline_decode(xdr, 4);
            if (unlikely(!p))
                goto out_overflow;
            pdev->mincount = be32_to_cpup(p);
            dprintk("%s: Min count too small. mincnt = %u\n",
                __func__, pdev->mincount);
        }
        return status;
    }

    p = xdr_inline_decode(xdr, 8);
    if (unlikely(!p))
        goto out_overflow;
    type = be32_to_cpup(p++);
    if (type != pdev->layout_type) {
        dprintk("%s: layout mismatch req: %u pdev: %u\n",
            __func__, pdev->layout_type, type);
        return -EINVAL;
    }
    /*
     * Get the length of the opaque device_addr4. xdr_read_pages places
     * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
     * and places the remaining xdr data in xdr_buf->tail
     */
    pdev->mincount = be32_to_cpup(p);
    if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
        goto out_overflow;

    /* Parse notification bitmap, verifying that it is zero. */
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    len = be32_to_cpup(p);
    if (len) {
        uint32_t i;

        p = xdr_inline_decode(xdr, 4 * len);
        if (unlikely(!p))
            goto out_overflow;
        for (i = 0; i < len; i++, p++) {
            if (be32_to_cpup(p)) {
                dprintk("%s: notifications not supported\n",
                    __func__);
                return -EIO;
            }
        }
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
                struct nfs4_layoutget_res *res)
{
    __be32 *p;
    int status;
    u32 layout_count;
    u32 recvd;

    status = decode_op_hdr(xdr, OP_LAYOUTGET);
    if (status)
        return status;
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    res->return_on_close = be32_to_cpup(p);
    decode_stateid(xdr, &res->stateid);
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    layout_count = be32_to_cpup(p);
    if (!layout_count) {
        dprintk("%s: server responded with empty layout array\n",
            __func__);
        return -EINVAL;
    }

    p = xdr_inline_decode(xdr, 28);
    if (unlikely(!p))
        goto out_overflow;
    p = xdr_decode_hyper(p, &res->range.offset);
    p = xdr_decode_hyper(p, &res->range.length);
    res->range.iomode = be32_to_cpup(p++);
    res->type = be32_to_cpup(p++);
    res->layoutp->len = be32_to_cpup(p);

    dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
        __func__,
        (unsigned long)res->range.offset,
        (unsigned long)res->range.length,
        res->range.iomode,
        res->type,
        res->layoutp->len);

    recvd = xdr_read_pages(xdr, res->layoutp->len);
    if (res->layoutp->len > recvd) {
        dprintk("NFS: server cheating in layoutget reply: "
                "layout len %u > recvd %u\n",
                res->layoutp->len, recvd);
        return -EINVAL;
    }

    if (layout_count > 1) {
        /* We only handle a length one array at the moment.  Any
         * further entries are just ignored.  Note that this means
         * the client may see a response that is less than the
         * minimum it requested.
         */
        dprintk("%s: server responded with %d layouts, dropping tail\n",
            __func__, layout_count);
    }

    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_layoutreturn(struct xdr_stream *xdr,
                   struct nfs4_layoutreturn_res *res)
{
    __be32 *p;
    int status;

    status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
    if (status)
        return status;
    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    res->lrs_present = be32_to_cpup(p);
    if (res->lrs_present)
        status = decode_stateid(xdr, &res->stateid);
    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_layoutcommit(struct xdr_stream *xdr,
                   struct rpc_rqst *req,
                   struct nfs4_layoutcommit_res *res)
{
    __be32 *p;
    __u32 sizechanged;
    int status;

    status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
    res->status = status;
    if (status)
        return status;

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

    if (sizechanged) {
        /* throw away new size */
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
            goto out_overflow;
    }
    return 0;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}

static int decode_test_stateid(struct xdr_stream *xdr,
                   struct nfs41_test_stateid_res *res)
{
    __be32 *p;
    int status;
    int num_res;

    status = decode_op_hdr(xdr, OP_TEST_STATEID);
    if (status)
        return status;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    num_res = be32_to_cpup(p++);
    if (num_res != 1)
        goto out;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    res->status = be32_to_cpup(p++);

    return status;
out_overflow:
    print_overflow_msg(__func__, xdr);
out:
    return -EIO;
}

static int decode_free_stateid(struct xdr_stream *xdr,
                   struct nfs41_free_stateid_res *res)
{
    __be32 *p;
    int status;

    status = decode_op_hdr(xdr, OP_FREE_STATEID);
    if (status)
        return status;

    p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    res->status = be32_to_cpup(p++);
    return res->status;
out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EIO;
}
#endif /* CONFIG_NFS_V4_1 */

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

/*
 * Decode OPEN_DOWNGRADE response
 */
static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
                       struct xdr_stream *xdr,
                       struct nfs_closeres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_open_downgrade(xdr, res);
    if (status != 0)
        goto out;
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode ACCESS response
 */
static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                   struct nfs4_accessres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status != 0)
        goto out;
    status = decode_access(xdr, &res->supported, &res->access);
    if (status != 0)
        goto out;
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode LOOKUP response
 */
static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                   struct nfs4_lookup_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_lookup(xdr);
    if (status)
        goto out;
    status = decode_getfh(xdr, res->fh);
    if (status)
        goto out;
    status = decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode LOOKUP_ROOT response
 */
static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    struct nfs4_lookup_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putrootfh(xdr);
    if (status)
        goto out;
    status = decode_getfh(xdr, res->fh);
    if (status == 0)
        status = decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode REMOVE response
 */
static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                   struct nfs_removeres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_remove(xdr, &res->cinfo);
out:
    return status;
}

/*
 * Decode RENAME response
 */
static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                   struct nfs_renameres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_savefh(xdr);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
out:
    return status;
}

/*
 * Decode LINK response
 */
static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                 struct nfs4_link_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_savefh(xdr);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_link(xdr, &res->cinfo);
    if (status)
        goto out;
    /*
     * Note order: OP_LINK leaves the directory as the current
     *             filehandle.
     */
    status = decode_restorefh(xdr);
    if (status)
        goto out;
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode CREATE response
 */
static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                   struct nfs4_create_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_create(xdr, &res->dir_cinfo);
    if (status)
        goto out;
    status = decode_getfh(xdr, res->fh);
    if (status)
        goto out;
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode SYMLINK response
 */
static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                struct nfs4_create_res *res)
{
    return nfs4_xdr_dec_create(rqstp, xdr, res);
}

/*
 * Decode GETATTR response
 */
static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                struct nfs4_getattr_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Encode an SETACL request
 */
static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
                struct nfs_setaclargs *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_setacl(xdr, args, &hdr);
    encode_nops(&hdr);
}

/*
 * Decode SETACL response
 */
static int
nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
            struct nfs_setaclres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_setattr(xdr);
out:
    return status;
}

/*
 * Decode GETACL response
 */
static int
nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
            struct nfs_getaclres *res)
{
    struct compound_hdr hdr;
    int status;

    if (res->acl_scratch != NULL) {
        void *p = page_address(res->acl_scratch);
        xdr_set_scratch_buffer(xdr, p, PAGE_SIZE);
    }
    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_getacl(xdr, rqstp, res);

out:
    return status;
}

/*
 * Decode CLOSE response
 */
static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                  struct nfs_closeres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_close(xdr, res);
    if (status != 0)
        goto out;
    /*
     * Note: Server may do delete on close for this file
     *  in which case the getattr call will fail with
     *  an ESTALE error. Shouldn't be a problem,
     *  though, since fattr->valid will remain unset.
     */
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode OPEN response
 */
static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                 struct nfs_openres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_open(xdr, res);
    if (status)
        goto out;
    status = decode_getfh(xdr, &res->fh);
    if (status)
        goto out;
    if (res->access_request)
        decode_access(xdr, &res->access_supported, &res->access_result);
    decode_getfattr(xdr, res->f_attr, res->server);
out:
    return status;
}

/*
 * Decode OPEN_CONFIRM response
 */
static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr,
                     struct nfs_open_confirmres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_open_confirm(xdr, res);
out:
    return status;
}

/*
 * Decode OPEN response
 */
static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    struct nfs_openres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_open(xdr, res);
    if (status)
        goto out;
    if (res->access_request)
        decode_access(xdr, &res->access_supported, &res->access_result);
    decode_getfattr(xdr, res->f_attr, res->server);
out:
    return status;
}

/*
 * Decode SETATTR response
 */
static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
                struct xdr_stream *xdr,
                struct nfs_setattrres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_setattr(xdr);
    if (status)
        goto out;
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode LOCK response
 */
static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                 struct nfs_lock_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_lock(xdr, res);
out:
    return status;
}

/*
 * Decode LOCKT response
 */
static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                  struct nfs_lockt_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_lockt(xdr, res);
out:
    return status;
}

/*
 * Decode LOCKU response
 */
static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                  struct nfs_locku_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_locku(xdr, res);
out:
    return status;
}

static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
                      struct xdr_stream *xdr, void *dummy)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_release_lockowner(xdr);
    return status;
}

/*
 * Decode READLINK response
 */
static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
                 struct xdr_stream *xdr,
                 struct nfs4_readlink_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_readlink(xdr, rqstp);
out:
    return status;
}

/*
 * Decode READDIR response
 */
static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                struct nfs4_readdir_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_readdir(xdr, rqstp, res);
out:
    return status;
}

/*
 * Decode Read response
 */
static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                 struct nfs_readres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_read(xdr, rqstp, res);
    if (!status)
        status = res->count;
out:
    return status;
}

/*
 * Decode WRITE response
 */
static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                  struct nfs_writeres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_write(xdr, res);
    if (status)
        goto out;
    if (res->fattr)
        decode_getfattr(xdr, res->fattr, res->server);
    if (!status)
        status = res->count;
out:
    return status;
}

/*
 * Decode COMMIT response
 */
static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                   struct nfs_commitres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_commit(xdr, res);
out:
    return status;
}

/*
 * Decode FSINFO response
 */
static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
                   struct nfs4_fsinfo_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_sequence(xdr, &res->seq_res, req);
    if (!status)
        status = decode_putfh(xdr);
    if (!status)
        status = decode_fsinfo(xdr, res->fsinfo);
    return status;
}

/*
 * Decode PATHCONF response
 */
static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
                 struct nfs4_pathconf_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_sequence(xdr, &res->seq_res, req);
    if (!status)
        status = decode_putfh(xdr);
    if (!status)
        status = decode_pathconf(xdr, res->pathconf);
    return status;
}

/*
 * Decode STATFS response
 */
static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
                   struct nfs4_statfs_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_sequence(xdr, &res->seq_res, req);
    if (!status)
        status = decode_putfh(xdr);
    if (!status)
        status = decode_statfs(xdr, res->fsstat);
    return status;
}

/*
 * Decode GETATTR_BITMAP response
 */
static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    struct nfs4_server_caps_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, req);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_server_caps(xdr, res);
out:
    return status;
}

/*
 * Decode RENEW response
 */
static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                  void *__unused)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_renew(xdr);
    return status;
}

/*
 * Decode SETCLIENTID response
 */
static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
                    struct xdr_stream *xdr,
                    struct nfs4_setclientid_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_setclientid(xdr, res);
    return status;
}

/*
 * Decode SETCLIENTID_CONFIRM response
 */
static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
                        struct xdr_stream *xdr,
                        struct nfs_fsinfo *fsinfo)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_setclientid_confirm(xdr);
    if (!status)
        status = decode_putrootfh(xdr);
    if (!status)
        status = decode_fsinfo(xdr, fsinfo);
    return status;
}

/*
 * Decode DELEGRETURN response
 */
static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    struct nfs4_delegreturnres *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status != 0)
        goto out;
    status = decode_getfattr(xdr, res->fattr, res->server);
    if (status != 0)
        goto out;
    status = decode_delegreturn(xdr);
out:
    return status;
}

/*
 * Decode FS_LOCATIONS response
 */
static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
                     struct xdr_stream *xdr,
                     struct nfs4_fs_locations_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, req);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_lookup(xdr);
    if (status)
        goto out;
    xdr_enter_page(xdr, PAGE_SIZE);
    status = decode_getfattr_generic(xdr, &res->fs_locations->fattr,
                     NULL, res->fs_locations,
                     res->fs_locations->server);
out:
    return status;
}

/*
 * Decode SECINFO response
 */
static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
                struct xdr_stream *xdr,
                struct nfs4_secinfo_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_secinfo(xdr, res);
out:
    return status;
}

#if defined(CONFIG_NFS_V4_1)
/*
 * Decode BIND_CONN_TO_SESSION response
 */
static int nfs4_xdr_dec_bind_conn_to_session(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    void *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_bind_conn_to_session(xdr, res);
    return status;
}

/*
 * Decode EXCHANGE_ID response
 */
static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    void *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_exchange_id(xdr, res);
    return status;
}

/*
 * Decode CREATE_SESSION response
 */
static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
                       struct xdr_stream *xdr,
                       struct nfs41_create_session_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_create_session(xdr, res);
    return status;
}

/*
 * Decode DESTROY_SESSION response
 */
static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    void *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_destroy_session(xdr, res);
    return status;
}

/*
 * Decode DESTROY_CLIENTID response
 */
static int nfs4_xdr_dec_destroy_clientid(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    void *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_destroy_clientid(xdr, res);
    return status;
}

/*
 * Decode SEQUENCE response
 */
static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
                 struct xdr_stream *xdr,
                 struct nfs4_sequence_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_sequence(xdr, res, rqstp);
    return status;
}

/*
 * Decode GET_LEASE_TIME response
 */
static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
                       struct xdr_stream *xdr,
                       struct nfs4_get_lease_time_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
    if (!status)
        status = decode_putrootfh(xdr);
    if (!status)
        status = decode_fsinfo(xdr, res->lr_fsinfo);
    return status;
}

/*
 * Decode RECLAIM_COMPLETE response
 */
static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr,
                     struct nfs41_reclaim_complete_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (!status)
        status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (!status)
        status = decode_reclaim_complete(xdr, (void *)NULL);
    return status;
}

/*
 * Decode GETDEVICELIST response
 */
static int nfs4_xdr_dec_getdevicelist(struct rpc_rqst *rqstp,
                      struct xdr_stream *xdr,
                      struct nfs4_getdevicelist_res *res)
{
    struct compound_hdr hdr;
    int status;

    dprintk("encoding getdevicelist!\n");

    status = decode_compound_hdr(xdr, &hdr);
    if (status != 0)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status != 0)
        goto out;
    status = decode_putfh(xdr);
    if (status != 0)
        goto out;
    status = decode_getdevicelist(xdr, res->devlist);
out:
    return status;
}

/*
 * Decode GETDEVINFO response
 */
static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
                      struct xdr_stream *xdr,
                      struct nfs4_getdeviceinfo_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status != 0)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status != 0)
        goto out;
    status = decode_getdeviceinfo(xdr, res->pdev);
out:
    return status;
}

/*
 * Decode LAYOUTGET response
 */
static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
                  struct xdr_stream *xdr,
                  struct nfs4_layoutget_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_layoutget(xdr, rqstp, res);
out:
    return status;
}

/*
 * Decode LAYOUTRETURN response
 */
static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr,
                     struct nfs4_layoutreturn_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_layoutreturn(xdr, res);
out:
    return status;
}

/*
 * Decode LAYOUTCOMMIT response
 */
static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr,
                     struct nfs4_layoutcommit_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putfh(xdr);
    if (status)
        goto out;
    status = decode_layoutcommit(xdr, rqstp, res);
    if (status)
        goto out;
    decode_getfattr(xdr, res->fattr, res->server);
out:
    return status;
}

/*
 * Decode SECINFO_NO_NAME response
 */
static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
                    struct xdr_stream *xdr,
                    struct nfs4_secinfo_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_putrootfh(xdr);
    if (status)
        goto out;
    status = decode_secinfo_no_name(xdr, res);
out:
    return status;
}

/*
 * Decode TEST_STATEID response
 */
static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr,
                     struct nfs41_test_stateid_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_test_stateid(xdr, res);
out:
    return status;
}

/*
 * Decode FREE_STATEID response
 */
static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
                     struct xdr_stream *xdr,
                     struct nfs41_free_stateid_res *res)
{
    struct compound_hdr hdr;
    int status;

    status = decode_compound_hdr(xdr, &hdr);
    if (status)
        goto out;
    status = decode_sequence(xdr, &res->seq_res, rqstp);
    if (status)
        goto out;
    status = decode_free_stateid(xdr, res);
out:
    return status;
}
#endif /* CONFIG_NFS_V4_1 */

int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
               int plus)
{
    unsigned int savep;
    uint32_t bitmap[3] = {0};
    uint32_t len;
    __be32 *p = xdr_inline_decode(xdr, 4);
    if (unlikely(!p))
        goto out_overflow;
    if (*p == xdr_zero) {
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
            goto out_overflow;
        if (*p == xdr_zero)
            return -EAGAIN;
        entry->eof = 1;
        return -EBADCOOKIE;
    }

    p = xdr_inline_decode(xdr, 12);
    if (unlikely(!p))
        goto out_overflow;
    entry->prev_cookie = entry->cookie;
    p = xdr_decode_hyper(p, &entry->cookie);
    entry->len = be32_to_cpup(p);

    p = xdr_inline_decode(xdr, entry->len);
    if (unlikely(!p))
        goto out_overflow;
    entry->name = (const char *) p;

    /*
     * In case the server doesn't return an inode number,
     * we fake one here.  (We don't use inode number 0,
     * since glibc seems to choke on it...)
     */
    entry->ino = 1;
    entry->fattr->valid = 0;

    if (decode_attr_bitmap(xdr, bitmap) < 0)
        goto out_overflow;

    if (decode_attr_length(xdr, &len, &savep) < 0)
        goto out_overflow;

    if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
                  NULL, entry->server) < 0)
        goto out_overflow;
    if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
        entry->ino = entry->fattr->mounted_on_fileid;
    else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
        entry->ino = entry->fattr->fileid;

    entry->d_type = DT_UNKNOWN;
    if (entry->fattr->valid & NFS_ATTR_FATTR_TYPE)
        entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);

    return 0;

out_overflow:
    print_overflow_msg(__func__, xdr);
    return -EAGAIN;
}

/*
 * We need to translate between nfs status return values and
 * the local errno values which may not be the same.
 */
static struct {
    int stat;
    int errno;
} nfs_errtbl[] = {
    { NFS4_OK,      0       },
    { NFS4ERR_PERM,     -EPERM      },
    { NFS4ERR_NOENT,    -ENOENT     },
    { NFS4ERR_IO,       -errno_NFSERR_IO},
    { NFS4ERR_NXIO,     -ENXIO      },
    { NFS4ERR_ACCESS,   -EACCES     },
    { NFS4ERR_EXIST,    -EEXIST     },
    { NFS4ERR_XDEV,     -EXDEV      },
    { NFS4ERR_NOTDIR,   -ENOTDIR    },
    { NFS4ERR_ISDIR,    -EISDIR     },
    { NFS4ERR_INVAL,    -EINVAL     },
    { NFS4ERR_FBIG,     -EFBIG      },
    { NFS4ERR_NOSPC,    -ENOSPC     },
    { NFS4ERR_ROFS,     -EROFS      },
    { NFS4ERR_MLINK,    -EMLINK     },
    { NFS4ERR_NAMETOOLONG,  -ENAMETOOLONG   },
    { NFS4ERR_NOTEMPTY, -ENOTEMPTY  },
    { NFS4ERR_DQUOT,    -EDQUOT     },
    { NFS4ERR_STALE,    -ESTALE     },
    { NFS4ERR_BADHANDLE,    -EBADHANDLE },
    { NFS4ERR_BAD_COOKIE,   -EBADCOOKIE },
    { NFS4ERR_NOTSUPP,  -ENOTSUPP   },
    { NFS4ERR_TOOSMALL, -ETOOSMALL  },
    { NFS4ERR_SERVERFAULT,  -EREMOTEIO  },
    { NFS4ERR_BADTYPE,  -EBADTYPE   },
    { NFS4ERR_LOCKED,   -EAGAIN     },
    { NFS4ERR_SYMLINK,  -ELOOP      },
    { NFS4ERR_OP_ILLEGAL,   -EOPNOTSUPP },
    { NFS4ERR_DEADLOCK, -EDEADLK    },
    { -1,           -EIO        }
};

/*
 * Convert an NFS error code to a local one.
 * This one is used jointly by NFSv2 and NFSv3.
 */
static int
nfs4_stat_to_errno(int stat)
{
    int i;
    for (i = 0; nfs_errtbl[i].stat != -1; i++) {
        if (nfs_errtbl[i].stat == stat)
            return nfs_errtbl[i].errno;
    }
    if (stat <= 10000 || stat > 10100) {
        /* The server is looney tunes. */
        return -EREMOTEIO;
    }
    /* If we cannot translate the error, the recovery routines should
     * handle it.
     * Note: remaining NFSv4 error codes have values > 10000, so should
     * not conflict with native Linux error codes.
     */
    return -stat;
}

#define PROC(proc, argtype, restype)                \
[NFSPROC4_CLNT_##proc] = {                  \
    .p_proc   = NFSPROC4_COMPOUND,              \
    .p_encode = (kxdreproc_t)nfs4_xdr_##argtype,        \
    .p_decode = (kxdrdproc_t)nfs4_xdr_##restype,        \
    .p_arglen = NFS4_##argtype##_sz,            \
    .p_replen = NFS4_##restype##_sz,            \
    .p_statidx = NFSPROC4_CLNT_##proc,          \
    .p_name   = #proc,                  \
}

struct rpc_procinfo nfs4_procedures[] = {
    PROC(READ,      enc_read,       dec_read),
    PROC(WRITE,     enc_write,      dec_write),
    PROC(COMMIT,        enc_commit,     dec_commit),
    PROC(OPEN,      enc_open,       dec_open),
    PROC(OPEN_CONFIRM,  enc_open_confirm,   dec_open_confirm),
    PROC(OPEN_NOATTR,   enc_open_noattr,    dec_open_noattr),
    PROC(OPEN_DOWNGRADE,    enc_open_downgrade, dec_open_downgrade),
    PROC(CLOSE,     enc_close,      dec_close),
    PROC(SETATTR,       enc_setattr,        dec_setattr),
    PROC(FSINFO,        enc_fsinfo,     dec_fsinfo),
    PROC(RENEW,     enc_renew,      dec_renew),
    PROC(SETCLIENTID,   enc_setclientid,    dec_setclientid),
    PROC(SETCLIENTID_CONFIRM, enc_setclientid_confirm, dec_setclientid_confirm),
    PROC(LOCK,      enc_lock,       dec_lock),
    PROC(LOCKT,     enc_lockt,      dec_lockt),
    PROC(LOCKU,     enc_locku,      dec_locku),
    PROC(ACCESS,        enc_access,     dec_access),
    PROC(GETATTR,       enc_getattr,        dec_getattr),
    PROC(LOOKUP,        enc_lookup,     dec_lookup),
    PROC(LOOKUP_ROOT,   enc_lookup_root,    dec_lookup_root),
    PROC(REMOVE,        enc_remove,     dec_remove),
    PROC(RENAME,        enc_rename,     dec_rename),
    PROC(LINK,      enc_link,       dec_link),
    PROC(SYMLINK,       enc_symlink,        dec_symlink),
    PROC(CREATE,        enc_create,     dec_create),
    PROC(PATHCONF,      enc_pathconf,       dec_pathconf),
    PROC(STATFS,        enc_statfs,     dec_statfs),
    PROC(READLINK,      enc_readlink,       dec_readlink),
    PROC(READDIR,       enc_readdir,        dec_readdir),
    PROC(SERVER_CAPS,   enc_server_caps,    dec_server_caps),
    PROC(DELEGRETURN,   enc_delegreturn,    dec_delegreturn),
    PROC(GETACL,        enc_getacl,     dec_getacl),
    PROC(SETACL,        enc_setacl,     dec_setacl),
    PROC(FS_LOCATIONS,  enc_fs_locations,   dec_fs_locations),
    PROC(RELEASE_LOCKOWNER, enc_release_lockowner,  dec_release_lockowner),
    PROC(SECINFO,       enc_secinfo,        dec_secinfo),
#if defined(CONFIG_NFS_V4_1)
    PROC(EXCHANGE_ID,   enc_exchange_id,    dec_exchange_id),
    PROC(CREATE_SESSION,    enc_create_session, dec_create_session),
    PROC(DESTROY_SESSION,   enc_destroy_session,    dec_destroy_session),
    PROC(SEQUENCE,      enc_sequence,       dec_sequence),
    PROC(GET_LEASE_TIME,    enc_get_lease_time, dec_get_lease_time),
    PROC(RECLAIM_COMPLETE,  enc_reclaim_complete,   dec_reclaim_complete),
    PROC(GETDEVICEINFO, enc_getdeviceinfo,  dec_getdeviceinfo),
    PROC(LAYOUTGET,     enc_layoutget,      dec_layoutget),
    PROC(LAYOUTCOMMIT,  enc_layoutcommit,   dec_layoutcommit),
    PROC(LAYOUTRETURN,  enc_layoutreturn,   dec_layoutreturn),
    PROC(SECINFO_NO_NAME,   enc_secinfo_no_name,    dec_secinfo_no_name),
    PROC(TEST_STATEID,  enc_test_stateid,   dec_test_stateid),
    PROC(FREE_STATEID,  enc_free_stateid,   dec_free_stateid),
    PROC(GETDEVICELIST, enc_getdevicelist,  dec_getdevicelist),
    PROC(BIND_CONN_TO_SESSION,
            enc_bind_conn_to_session, dec_bind_conn_to_session),
    PROC(DESTROY_CLIENTID,  enc_destroy_clientid,   dec_destroy_clientid),
#endif /* CONFIG_NFS_V4_1 */
};

const struct rpc_version nfs_version4 = {
    .number         = 4,
    .nrprocs        = ARRAY_SIZE(nfs4_procedures),
    .procs          = nfs4_procedures
};

/*
 * Local variables:
 *  c-basic-offset: 8
 * End:
 */