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

#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/kdev_t.h>
#include <linux/module.h>
#include <linux/utsname.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_common.h>

#include "nfs4_fs.h"
#include "nfs4trace.h"
#include "internal.h"
#include "nfs4idmap.h"
#include "nfs4session.h"
#include "pnfs.h"
#include "netns.h"

#define NFSDBG_FACILITY         NFSDBG_XDR

struct compound_hdr;
static void encode_layoutget(struct xdr_stream *xdr,
                             const struct nfs4_layoutget_args *args,
                             struct compound_hdr *hdr);
static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
                             struct nfs4_layoutget_res *res);

/* 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 pagepad_maxsz           (1)
#define open_owner_id_maxsz     (2 + 1 + 2 + 2)
#define lock_owner_id_maxsz     (2 + 1 + 2)
#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 nfstime4_maxsz          (3)
#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))
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
/* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
#define nfs4_label_maxsz        (4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
#else
#define nfs4_label_maxsz        0
#endif
/* 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*nfstime4_maxsz + \
                                nfs4_owner_maxsz + \
                                nfs4_group_maxsz + nfs4_label_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 + \
                                nfs4_label_maxsz + \
                                1 + nfstime4_maxsz + \
                                1 + nfstime4_maxsz)
#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 + 1 + \
                                 1 /* lease time */ + \
                                 2 /* max filesize */ + \
                                 2 /* max read */ + \
                                 2 /* max write */ + \
                                 nfstime4_maxsz /* time delta */ + \
                                 5 /* fs layout types */ + \
                                 1 /* layout blksize */ + \
                                 1 /* clone blksize */ + \
                                 1 /* change attr type */ + \
                                 1 /* xattr support */)
#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) + \
                                /* client name */ \
                                1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
                                1 /* sc_prog */ + \
                                1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
                                1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
                                1) /* sc_cb_ident */
#define decode_setclientid_maxsz \
                                (op_decode_hdr_maxsz + \
                                2 /* clientid */ + \
                                XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
                                1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
                                1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
#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_lookupp_maxsz    (op_encode_hdr_maxsz)
#define decode_lookupp_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 + \
                                1 + open_owner_id_maxsz + \
                                encode_opentype_maxsz + \
                                encode_claim_null_maxsz)
#define decode_space_limit_maxsz        (3)
#define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
#define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
                                decode_space_limit_maxsz + \
                                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_delegattr_maxsz  (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + \
                                nfs4_fattr_bitmap_maxsz + \
                                2*nfstime4_maxsz)
#define decode_delegattr_maxsz  (decode_setattr_maxsz)
#define encode_read_maxsz       (op_encode_hdr_maxsz + \
                                 encode_stateid_maxsz + 3)
#define decode_read_maxsz       (op_decode_hdr_maxsz + 2 + pagepad_maxsz)
#define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
                                 2 + encode_verifier_maxsz + 5 + \
                                nfs4_label_maxsz)
#define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
                                 decode_verifier_maxsz + pagepad_maxsz)
#define encode_readlink_maxsz   (op_encode_hdr_maxsz)
#define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1 + pagepad_maxsz)
#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  (2 + 1 + lock_owner_id_maxsz)

#define encode_lock_maxsz       (op_encode_hdr_maxsz + \
                                 7 + \
                                 1 + encode_stateid_maxsz + 1 + \
                                 encode_lockowner_maxsz)
#define decode_lock_denied_maxsz \
                                (2 + 2 + 1 + 2 + 1 + lock_owner_id_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 + pagepad_maxsz)
#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 \
                                (pagepad_maxsz)
#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))

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

#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
                                encode_verifier_maxsz + \
                                1 /* co_ownerid.len */ + \
                                /* eia_clientowner */ \
                                1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
                                1 /* flags */ + \
                                1 /* spa_how */ + \
                                /* max is SP4_MACH_CRED (for now) */ + \
                                1 + NFS4_OP_MAP_NUM_WORDS + \
                                1 + NFS4_OP_MAP_NUM_WORDS + \
                                1 /* implementation id array of size 1 */ + \
                                1 /* nii_domain */ + \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
                                1 /* nii_name */ + \
                                XDR_QUADLEN(IMPL_NAME_LIMIT) + \
                                3 /* nii_date */)
#define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
                                2 /* eir_clientid */ + \
                                1 /* eir_sequenceid */ + \
                                1 /* eir_flags */ + \
                                1 /* spr_how */ + \
                                  /* max is SP4_MACH_CRED (for now) */ + \
                                1 + NFS4_OP_MAP_NUM_WORDS + \
                                1 + NFS4_OP_MAP_NUM_WORDS + \
                                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_get_dir_deleg_maxsz (op_encode_hdr_maxsz + \
                                    4 /* gdda_signal_deleg_avail */ + \
                                    8 /* gdda_notification_types */ + \
                                    nfstime4_maxsz /* gdda_child_attr_delay */ + \
                                    nfstime4_maxsz /* gdda_dir_attr_delay */ + \
                                    nfs4_fattr_bitmap_maxsz /* gdda_child_attributes */ + \
                                    nfs4_fattr_bitmap_maxsz /* gdda_dir_attributes */)
#define decode_get_dir_deleg_maxsz (op_decode_hdr_maxsz + \
                                    4 /* gddrnf_status */ + \
                                    encode_verifier_maxsz /* gddr_cookieverf */ + \
                                    encode_stateid_maxsz /* gddr_stateid */ + \
                                    8 /* gddr_notification */ + \
                                    nfs4_fattr_maxsz /* gddr_child_attributes */ + \
                                    nfs4_fattr_maxsz /* gddr_dir_attributes */)
#define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
                                XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
                                1 /* layout type */ + \
                                1 /* maxcount */ + \
                                1 /* bitmap size */ + \
                                1 /* notification bitmap length */ + \
                                1 /* notification bitmap, word 0 */)
#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, word 0 */ + \
                                pagepad_maxsz /* possible XDR padding */)
#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) + \
                                pagepad_maxsz)
#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 /* layoutupdate4 opaqueue len */)
                                  /* the actual content of layoutupdate4 should
                                     be allocated by drivers and spliced in
                                     using xdr_write_pages */
#define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
#define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
                                encode_stateid_maxsz + \
                                1 + \
                                XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
#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)

#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 + \
                                encode_layoutget_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 + \
                                decode_layoutget_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 + \
                                        encode_layoutget_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 + \
                                        decode_layoutget_maxsz)
#define NFS4_enc_open_downgrade_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_layoutreturn_maxsz + \
                                 encode_open_downgrade_maxsz)
#define NFS4_dec_open_downgrade_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_layoutreturn_maxsz + \
                                 decode_open_downgrade_maxsz)
#define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_layoutreturn_maxsz + \
                                 encode_close_maxsz + \
                                 encode_getattr_maxsz)
#define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_layoutreturn_maxsz + \
                                 decode_close_maxsz + \
                                 decode_getattr_maxsz)
#define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_setattr_maxsz + \
                                 encode_getattr_maxsz)
#define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_setattr_maxsz + \
                                 decode_getattr_maxsz)
#define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_fsinfo_maxsz)
#define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_fsinfo_maxsz)
#define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
                                encode_renew_maxsz)
#define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
                                decode_renew_maxsz)
#define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
                                encode_setclientid_maxsz)
#define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
                                decode_setclientid_maxsz)
#define NFS4_enc_setclientid_confirm_sz \
                                (compound_encode_hdr_maxsz + \
                                encode_setclientid_confirm_maxsz)
#define NFS4_dec_setclientid_confirm_sz \
                                (compound_decode_hdr_maxsz + \
                                decode_setclientid_confirm_maxsz)
#define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_lock_maxsz)
#define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_lock_maxsz)
#define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_lockt_maxsz)
#define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_lockt_maxsz)
#define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_locku_maxsz)
#define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_locku_maxsz)
#define NFS4_enc_release_lockowner_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_lockowner_maxsz)
#define NFS4_dec_release_lockowner_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_release_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_get_dir_deleg_maxsz + \
                                encode_getattr_maxsz + \
                                encode_renew_maxsz)
#define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_get_dir_deleg_maxsz + \
                                decode_getattr_maxsz + \
                                decode_renew_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_lookupp_sz     (compound_encode_hdr_maxsz + \
                                encode_sequence_maxsz + \
                                encode_putfh_maxsz + \
                                encode_lookupp_maxsz + \
                                encode_getattr_maxsz + \
                                encode_getfh_maxsz)
#define NFS4_dec_lookupp_sz     (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_lookupp_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_layoutreturn_maxsz + \
                                encode_delegattr_maxsz + \
                                encode_delegreturn_maxsz + \
                                encode_getattr_maxsz)
#define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
                                decode_sequence_maxsz + \
                                decode_putfh_maxsz + \
                                decode_layoutreturn_maxsz + \
                                decode_delegattr_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 + \
                                 encode_renew_maxsz)
#define NFS4_dec_fs_locations_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_lookup_maxsz + \
                                 decode_fs_locations_maxsz + \
                                 decode_renew_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)
#define NFS4_enc_fsid_present_sz \
                                (compound_encode_hdr_maxsz + \
                                 encode_sequence_maxsz + \
                                 encode_putfh_maxsz + \
                                 encode_getfh_maxsz + \
                                 encode_renew_maxsz)
#define NFS4_dec_fsid_present_sz \
                                (compound_decode_hdr_maxsz + \
                                 decode_sequence_maxsz + \
                                 decode_putfh_maxsz + \
                                 decode_getfh_maxsz + \
                                 decode_renew_maxsz)
#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_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);

const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
                                           compound_decode_hdr_maxsz +
                                           decode_sequence_maxsz) *
                                          XDR_UNIT);
EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);

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

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

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

static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
        WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
}

static void encode_uint32(struct xdr_stream *xdr, u32 n)
{
        WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
}

static void encode_uint64(struct xdr_stream *xdr, u64 n)
{
        WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
}

static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
                const __u32 *bitmap, size_t len)
{
        ssize_t ret;

        /* Trim empty words */
        while (len > 0 && bitmap[len-1] == 0)
                len--;
        ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
        if (WARN_ON_ONCE(ret < 0))
                return ret;
        return len;
}

static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
                __u32 *res, size_t len)
{
        size_t i;
        __u32 tmp;

        while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
                len--;
        for (i = len; i-- > 0;) {
                tmp = bitmap[i] & mask[i];
                res[i] = tmp;
        }
        return len;
}

static void encode_nfs4_seqid(struct xdr_stream *xdr,
                const struct nfs_seqid *seqid)
{
        if (seqid != NULL)
                encode_uint32(xdr, seqid->sequence->counter);
        else
                encode_uint32(xdr, 0);
}

static void encode_compound_hdr(struct xdr_stream *xdr,
                                struct rpc_rqst *req,
                                struct compound_hdr *hdr)
{
        __be32 *p;

        /* 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 = 3 + hdr->taglen;

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

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

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

static void encode_nfs4_stateid(struct xdr_stream *xdr,
                                const nfs4_stateid *stateid)
{
        encode_opaque_fixed(xdr, stateid->data, 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 __be32 *
xdr_encode_nfstime4(__be32 *p, const struct timespec64 *t)
{
        p = xdr_encode_hyper(p, t->tv_sec);
        *p++ = cpu_to_be32(t->tv_nsec);
        return p;
}

static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
                                const struct nfs4_label *label,
                                const umode_t *umask,
                                const struct nfs_server *server,
                                const uint32_t attrmask[])
{
        char owner_name[IDMAP_NAMESZ];
        char owner_group[IDMAP_NAMESZ];
        int owner_namelen = 0;
        int owner_grouplen = 0;
        __be32 *p;
        uint32_t len = 0;
        uint32_t bmval[3] = { 0 };

        /*
         * We reserve enough space to write the entire attribute buffer at once.
         */
        if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) {
                bmval[0] |= FATTR4_WORD0_SIZE;
                len += 8;
        }
        if (iap->ia_valid & ATTR_MODE) {
                if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) {
                        bmval[2] |= FATTR4_WORD2_MODE_UMASK;
                        len += 8;
                } else if (attrmask[1] & FATTR4_WORD1_MODE) {
                        bmval[1] |= FATTR4_WORD1_MODE;
                        len += 4;
                }
        }
        if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) {
                owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
                if (owner_namelen < 0) {
                        dprintk("nfs: couldn't resolve uid %d to string\n",
                                        from_kuid(&init_user_ns, iap->ia_uid));
                        /* XXX */
                        strcpy(owner_name, "nobody");
                        owner_namelen = sizeof("nobody") - 1;
                        /* goto out; */
                }
                bmval[1] |= FATTR4_WORD1_OWNER;
                len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
        }
        if ((iap->ia_valid & ATTR_GID) &&
           (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) {
                owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
                if (owner_grouplen < 0) {
                        dprintk("nfs: couldn't resolve gid %d to string\n",
                                        from_kgid(&init_user_ns, iap->ia_gid));
                        strcpy(owner_group, "nobody");
                        owner_grouplen = sizeof("nobody") - 1;
                        /* goto out; */
                }
                bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
                len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
        }
        if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
                if (iap->ia_valid & ATTR_ATIME_SET) {
                        bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
                        len += 4 + (nfstime4_maxsz << 2);
                } else if (iap->ia_valid & ATTR_ATIME) {
                        bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
                        len += 4;
                }
        }
        if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
                if (iap->ia_valid & ATTR_MTIME_SET) {
                        bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
                        len += 4 + (nfstime4_maxsz << 2);
                } else if (iap->ia_valid & ATTR_MTIME) {
                        bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
                        len += 4;
                }
        }

        if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) {
                len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
                bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
        }

        xdr_encode_bitmap4(xdr, bmval, ARRAY_SIZE(bmval));
        xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);

        if (bmval[0] & FATTR4_WORD0_SIZE)
                p = xdr_encode_hyper(p, iap->ia_size);
        if (bmval[1] & FATTR4_WORD1_MODE)
                *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
        if (bmval[1] & FATTR4_WORD1_OWNER)
                p = xdr_encode_opaque(p, owner_name, owner_namelen);
        if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
                p = xdr_encode_opaque(p, owner_group, owner_grouplen);
        if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
                if (iap->ia_valid & ATTR_ATIME_SET) {
                        *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
                        p = xdr_encode_nfstime4(p, &iap->ia_atime);
                } else
                        *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
        }
        if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
                if (iap->ia_valid & ATTR_MTIME_SET) {
                        *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
                        p = xdr_encode_nfstime4(p, &iap->ia_mtime);
                } else
                        *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
        }
        if (label && (bmval[2] & FATTR4_WORD2_SECURITY_LABEL)) {
                *p++ = cpu_to_be32(label->lfs);
                *p++ = cpu_to_be32(label->pi);
                *p++ = cpu_to_be32(label->len);
                p = xdr_encode_opaque_fixed(p, label->label, label->len);
        }
        if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
                *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
                *p++ = cpu_to_be32(*umask);
        }

/* 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);
                xdr->buf->flags |= XDRBUF_WRITE;
                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->label, &create->umask,
                        create->server, create->server->attr_bitmask);
}

static void encode_getattr(struct xdr_stream *xdr,
                const __u32 *bitmap, const __u32 *mask, size_t len,
                struct compound_hdr *hdr)
{
        __u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];

        encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
        if (mask) {
                if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
                        len = ARRAY_SIZE(masked_bitmap);
                len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
                bitmap = masked_bitmap;
        }
        xdr_encode_bitmap4(xdr, bitmap, len);
}

static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
                        ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
}

static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
                                 const u32 *open_bitmap,
                                 struct compound_hdr *hdr)
{
        encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
}

static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
                        ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
}

static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
{
        encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
                        ARRAY_SIZE(nfs4_fs_locations_bitmap), 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 (lock_is_read(fl))
                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));
}

#if defined(CONFIG_NFS_V4_0)
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);
}
#endif /* CONFIG_NFS_V4_0 */

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_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
}

static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
{
        __be32 *p;

        p = reserve_space(xdr, 8);
        *p++ = cpu_to_be32(share_access);
        *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 28
 */
        encode_nfs4_seqid(xdr, arg->seqid);
        encode_share_access(xdr, arg->share_access);
        p = reserve_space(xdr, 40);
        p = xdr_encode_hyper(p, arg->clientid);
        *p++ = cpu_to_be32(28);
        p = xdr_encode_opaque_fixed(p, "open id:", 8);
        *p++ = cpu_to_be32(arg->server->s_dev);
        p = xdr_encode_hyper(p, 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;

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

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

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

static inline void encode_delegation_type(struct xdr_stream *xdr, u32 delegation_type)
{
        __be32 *p;

        p = reserve_space(xdr, 4);
        switch (delegation_type) {
        case NFS4_OPEN_DELEGATE_NONE:
        case NFS4_OPEN_DELEGATE_READ:
        case NFS4_OPEN_DELEGATE_WRITE:
        case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
        case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
                *p = cpu_to_be32(delegation_type);
                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, u32 type)
{
        __be32 *p;

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

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

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

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

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

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

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

static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
{
        encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
        encode_openhdr(xdr, arg);
        encode_opentype(xdr, arg);
        switch (arg->claim) {
        case NFS4_OPEN_CLAIM_NULL:
                encode_claim_null(xdr, arg->name);
                break;
        case NFS4_OPEN_CLAIM_PREVIOUS:
                encode_claim_previous(xdr, arg->u.delegation_type);
                break;
        case NFS4_OPEN_CLAIM_DELEGATE_CUR:
                encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
                break;
        case NFS4_OPEN_CLAIM_FH:
                encode_claim_fh(xdr);
                break;
        case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
                encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
                break;
        default:
                BUG();
        }
}

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

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

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

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

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

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

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

static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
{
        uint32_t attrs[3] = {
                FATTR4_WORD0_TYPE
                | FATTR4_WORD0_RDATTR_ERROR,
                FATTR4_WORD1_MOUNTED_ON_FILEID,
        };
        uint32_t dircount = readdir->count;
        uint32_t maxcount = readdir->count;
        __be32 *p, verf[2];
        uint32_t attrlen = 0;
        unsigned int i;

        if (readdir->plus) {
                attrs[0] |= 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_CREATE
                        | FATTR4_WORD1_TIME_METADATA
                        | FATTR4_WORD1_TIME_MODIFY;
                attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
        }
        /* Use mounted_on_fileid only if the server supports it */
        if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
                attrs[0] |= FATTR4_WORD0_FILEID;
        for (i = 0; i < ARRAY_SIZE(attrs); i++) {
                attrs[i] &= readdir->bitmask[i];
                if (attrs[i] != 0)
                        attrlen = i+1;
        }

        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, 12 + (attrlen << 2));
        *p++ = cpu_to_be32(dircount);
        *p++ = cpu_to_be32(maxcount);
        *p++ = cpu_to_be32(attrlen);
        for (i = 0; i < attrlen; i++)
                *p++ = cpu_to_be32(attrs[i]);
        memcpy(verf, readdir->verifier.data, sizeof(verf));

        dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
                        __func__,
                        (unsigned long long)readdir->cookie,
                        verf[0], verf[1],
                        attrs[0] & readdir->bitmask[0],
                        attrs[1] & readdir->bitmask[1],
                        attrs[2] & readdir->bitmask[2]);
}

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 nfs4_acltype_to_bitmap(enum nfs4_acl_type type, __u32 bitmap[2])
{
        switch (type) {
        default:
                bitmap[0] = FATTR4_WORD0_ACL;
                bitmap[1] = 0;
                break;
        case NFS4ACL_DACL:
                bitmap[0] = 0;
                bitmap[1] = FATTR4_WORD1_DACL;
                break;
        case NFS4ACL_SACL:
                bitmap[0] = 0;
                bitmap[1] = FATTR4_WORD1_SACL;
        }
}

static void encode_setacl(struct xdr_stream *xdr,
                          const struct nfs_setaclargs *arg,
                          struct compound_hdr *hdr)
{
        __u32 bitmap[2];

        nfs4_acltype_to_bitmap(arg->acl_type, bitmap);

        encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
        encode_nfs4_stateid(xdr, &zero_stateid);
        xdr_encode_bitmap4(xdr, bitmap, ARRAY_SIZE(bitmap));
        encode_uint32(xdr, arg->acl_len);
        xdr_write_pages(xdr, arg->acl_pages, 0, 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, arg->label, NULL, server,
                        server->attr_bitmask);
}

static void encode_delegattr(struct xdr_stream *xdr,
                const nfs4_stateid *stateid,
                const struct nfs4_delegattr *attr,
                struct compound_hdr *hdr)
{
        uint32_t bitmap[3] = { 0 };
        uint32_t len = 0;
        __be32 *p;

        encode_op_hdr(xdr, OP_SETATTR, encode_delegattr_maxsz, hdr);
        encode_nfs4_stateid(xdr, stateid);
        if (attr->atime_set) {
                bitmap[2] |= FATTR4_WORD2_TIME_DELEG_ACCESS;
                len += (nfstime4_maxsz << 2);
        }
        if (attr->mtime_set) {
                bitmap[2] |= FATTR4_WORD2_TIME_DELEG_MODIFY;
                len += (nfstime4_maxsz << 2);
        }
        xdr_encode_bitmap4(xdr, bitmap, ARRAY_SIZE(bitmap));
        xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);
        if (bitmap[2] & FATTR4_WORD2_TIME_DELEG_ACCESS)
                p = xdr_encode_nfstime4(p, &attr->atime);
        if (bitmap[2] & FATTR4_WORD2_TIME_DELEG_MODIFY)
                p = xdr_encode_nfstime4(p, &attr->mtime);
}

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, strlen(setclientid->sc_clnt->cl_owner_id),
                        setclientid->sc_clnt->cl_owner_id);
        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_clnt->cl_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_pgio_args *args,
                         struct compound_hdr *hdr)
{
        __be32 *p;

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

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

        xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
}

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

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

/* NFSv4.1 operations */
static void encode_bind_conn_to_session(struct xdr_stream *xdr,
                                   const struct nfs41_bind_conn_to_session_args *args,
                                   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, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
        p = xdr_reserve_space(xdr, 8);
        *p++ = cpu_to_be32(args->dir);
        *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
}

static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
{
        unsigned int i;
        encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
        for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
                encode_uint32(xdr, op_map->u.words[i]);
}

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

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

        encode_string(xdr, strlen(args->client->cl_owner_id),
                        args->client->cl_owner_id);

        encode_uint32(xdr, args->flags);
        encode_uint32(xdr, args->state_protect.how);

        switch (args->state_protect.how) {
        case SP4_NONE:
                break;
        case SP4_MACH_CRED:
                encode_op_map(xdr, &args->state_protect.enforce);
                encode_op_map(xdr, &args->state_protect.allow);
                break;
        default:
                WARN_ON_ONCE(1);
                break;
        }

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

        if (len > 0) {
                encode_uint32(xdr, 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
                encode_uint32(xdr, 0);  /* implementation id array length=0 */
}

static void encode_create_session(struct xdr_stream *xdr,
                                  const struct nfs41_create_session_args *args,
                                  struct compound_hdr *hdr)
{
        __be32 *p;
        struct nfs_client *clp = args->client;
        struct rpc_clnt *clnt = clp->cl_rpcclient;
        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 + 2)
                                * XDR_UNIT + RPC_MAX_AUTH_SIZE;

        encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
        p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
        p = xdr_encode_hyper(p, args->clientid);
        *p++ = cpu_to_be32(args->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++ = cpu_to_be32(ktime_to_ns(nn->boot_time)); /* stamp */
        p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
        *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,
                                   const 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,
                                    const 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);
}

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

        tp = slot->table;
        session = tp->session;
        if (!session)
                return;

        encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);

        /*
         * Sessionid + seqid + slotid + max slotid + cache_this
         */
        dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
                "max_slotid=%d cache_this=%d\n",
                __func__,
                ((u32 *)session->sess_id.data)[0],
                ((u32 *)session->sess_id.data)[1],
                ((u32 *)session->sess_id.data)[2],
                ((u32 *)session->sess_id.data)[3],
                slot->seq_nr, slot->slot_nr,
                tp->highest_used_slotid, args->sa_cache_this);
        p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
        p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
        *p++ = cpu_to_be32(slot->seq_nr);
        *p++ = cpu_to_be32(slot->slot_nr);
        *p++ = cpu_to_be32(tp->highest_used_slotid);
        *p = cpu_to_be32(args->sa_cache_this);
}

static void
encode_get_dir_delegation(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        struct timespec64 ts = { 0, 0 };
        u32 notifications[1] = { 0 };
        u32 attributes[1] = { 0 };
        __be32 *p;

        encode_op_hdr(xdr, OP_GET_DIR_DELEGATION, decode_get_dir_deleg_maxsz, hdr);

        /* We don't handle CB_RECALLABLE_OBJ_AVAIL yet. */
        xdr_stream_encode_bool(xdr, false);

        xdr_encode_bitmap4(xdr, notifications, ARRAY_SIZE(notifications));

        /* Request no delay on attribute updates */
        p = reserve_space(xdr, 12 + 12);
        p = xdr_encode_nfstime4(p, &ts);
        xdr_encode_nfstime4(p, &ts);

        /* Requested child attributes */
        xdr_encode_bitmap4(xdr, attributes, ARRAY_SIZE(attributes));

        /* Requested dir attributes */
        xdr_encode_bitmap4(xdr, attributes, ARRAY_SIZE(attributes));
}

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, NFS4_DEVICEID4_SIZE + 4 + 4);
        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->maxcount);       /* gdia_maxcount */

        p = reserve_space(xdr, 4 + 4);
        *p++ = cpu_to_be32(1);                  /* bitmap length */
        *p++ = cpu_to_be32(args->notify_types);
}

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);
        if (args->lastbytewritten != U64_MAX) {
                p = reserve_space(xdr, 20);
                *p++ = cpu_to_be32(1); /* newoffset = TRUE */
                p = xdr_encode_hyper(p, args->lastbytewritten);
        } else {
                p = reserve_space(xdr, 12);
                *p++ = cpu_to_be32(0); /* newoffset = FALSE */
        }
        *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
        *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */

        encode_uint32(xdr, args->layoutupdate_len);
        if (args->layoutupdate_pages)
                xdr_write_pages(xdr, args->layoutupdate_pages, 0,
                                args->layoutupdate_len);

        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(args->range.iomode);
        *p = cpu_to_be32(RETURN_FILE);
        p = reserve_space(xdr, 16);
        p = xdr_encode_hyper(p, args->range.offset);
        p = xdr_encode_hyper(p, args->range.length);
        spin_lock(&args->inode->i_lock);
        encode_nfs4_stateid(xdr, &args->stateid);
        spin_unlock(&args->inode->i_lock);
        if (args->ld_private->ops && args->ld_private->ops->encode)
                args->ld_private->ops->encode(xdr, args, args->ld_private);
        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,
                                const 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,
                                const 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);
}

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

static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
{
        struct nfs4_session *session = args->sa_slot->table->session;
        if (session)
                return session->clp->cl_mvops->minor_version;
        return 0;
}

/*
 * Encode an ACCESS request
 */
static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
                                const void *data)
{
        const struct nfs4_accessargs *args = data;
        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);
        if (args->bitmask)
                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 void *data)
{
        const struct nfs4_lookup_arg *args = data;
        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 LOOKUPP request
 */
static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
                const void *data)
{
        const struct nfs4_lookupp_arg *args = data;
        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_lookupp(xdr, &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 void *data)
{
        const struct nfs4_lookup_root_arg *args = data;
        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 void *data)
{
        const struct nfs_removeargs *args = data;
        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 void *data)
{
        const struct nfs_renameargs *args = data;
        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 void *data)
{
        const struct nfs4_link_arg *args = data;
        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 void *data)
{
        const struct nfs4_create_arg *args = data;
        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 void *data)
{
        const struct nfs4_create_arg *args = data;

        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 void *data)
{
        const struct nfs4_getattr_arg *args = data;
        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);
        if (args->get_dir_deleg)
                encode_get_dir_delegation(xdr, &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,
                               const void *data)
{
        const struct nfs_closeargs *args = data;
        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);
        if (args->lr_args)
                encode_layoutreturn(xdr, args->lr_args, &hdr);
        if (args->bitmask != NULL)
                encode_getfattr(xdr, args->bitmask, &hdr);
        encode_close(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode an OPEN request
 */
static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
                              const void *data)
{
        const struct nfs_openargs *args = data;
        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);
        if (args->lg_args) {
                encode_layoutget(xdr, args->lg_args, &hdr);
                rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
                                        args->lg_args->layout.pglen,
                                        hdr.replen - pagepad_maxsz);
        }
        encode_nops(&hdr);
}

/*
 * Encode an OPEN_CONFIRM request
 */
static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      const void *data)
{
        const struct nfs_open_confirmargs *args = data;
        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,
                                     const void *data)
{
        const struct nfs_openargs *args = data;
        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);
        if (args->lg_args) {
                encode_layoutget(xdr, args->lg_args, &hdr);
                rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
                                        args->lg_args->layout.pglen,
                                        hdr.replen - pagepad_maxsz);
        }
        encode_nops(&hdr);
}

/*
 * Encode an OPEN_DOWNGRADE request
 */
static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
                                        struct xdr_stream *xdr,
                                        const void *data)
{
        const struct nfs_closeargs *args = data;
        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);
        if (args->lr_args)
                encode_layoutreturn(xdr, args->lr_args, &hdr);
        encode_open_downgrade(xdr, args, &hdr);
        encode_nops(&hdr);
}

/*
 * Encode a LOCK request
 */
static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
                              const void *data)
{
        const struct nfs_lock_args *args = data;
        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,
                               const void *data)
{
        const struct nfs_lockt_args *args = data;
        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,
                               const void *data)
{
        const struct nfs_locku_args *args = data;
        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);
}

#if defined(CONFIG_NFS_V4_0)
static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
                                           struct xdr_stream *xdr,
                                           const void *data)
{
        const struct nfs_release_lockowner_args *args = data;
        struct compound_hdr hdr = {
                .minorversion = 0,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_release_lockowner(xdr, &args->lock_owner, &hdr);
        encode_nops(&hdr);
}
#endif /* CONFIG_NFS_V4_0 */

/*
 * Encode a READLINK request
 */
static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
                                  const void *data)
{
        const struct nfs4_readlink *args = data;
        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);

        rpc_prepare_reply_pages(req, args->pages, args->pgbase,
                                args->pglen, hdr.replen - pagepad_maxsz);
        encode_nops(&hdr);
}

/*
 * Encode a READDIR request
 */
static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
                                 const void *data)
{
        const struct nfs4_readdir_arg *args = data;
        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);

        rpc_prepare_reply_pages(req, args->pages, args->pgbase,
                                args->count, hdr.replen - pagepad_maxsz);
        encode_nops(&hdr);
}

/*
 * Encode a READ request
 */
static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
                              const void *data)
{
        const struct nfs_pgio_args *args = data;
        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);

        rpc_prepare_reply_pages(req, args->pages, args->pgbase,
                                args->count, hdr.replen - pagepad_maxsz);
        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,
                                 const void *data)
{
        const struct nfs_setattrargs *args = data;
        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,
                                const void *data)
{
        const struct nfs_getaclargs *args = data;
        struct compound_hdr hdr = {
                .minorversion = nfs4_xdr_minorversion(&args->seq_args),
        };
        __u32 nfs4_acl_bitmap[2];
        uint32_t replen;

        nfs4_acltype_to_bitmap(args->acl_type, nfs4_acl_bitmap);

        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;
        encode_getattr(xdr, nfs4_acl_bitmap, NULL,
                        ARRAY_SIZE(nfs4_acl_bitmap), &hdr);

        rpc_prepare_reply_pages(req, args->acl_pages, 0,
                                args->acl_len, replen);
        encode_nops(&hdr);
}

/*
 * Encode a WRITE request
 */
static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
                               const void *data)
{
        const struct nfs_pgio_args *args = data;
        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,
                                const void *data)
{
        const struct nfs_commitargs *args = data;
        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,
                                const void *data)
{
        const struct nfs4_fsinfo_arg *args = data;
        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 void *data)
{
        const struct nfs4_pathconf_arg *args = data;
        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(xdr, nfs4_pathconf_bitmap, args->bitmask,
                        ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
        encode_nops(&hdr);
}

/*
 * a STATFS request
 */
static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
                                const void *data)
{
        const struct nfs4_statfs_arg *args = data;
        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(xdr, nfs4_statfs_bitmap, args->bitmask,
                        ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
        encode_nops(&hdr);
}

/*
 * GETATTR_BITMAP request
 */
static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
                                     struct xdr_stream *xdr,
                                     const void *data)
{
        const struct nfs4_server_caps_arg *args = data;
        const u32 *bitmask = args->bitmask;
        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(xdr, bitmask, NULL, 3, &hdr);
        encode_nops(&hdr);
}

/*
 * a RENEW request
 */
#if defined(CONFIG_NFS_V4_0)
static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
                               const void *data)

{
        const struct nfs_client *clp = data;
        struct compound_hdr hdr = {
                .nops   = 0,
        };

        encode_compound_hdr(xdr, req, &hdr);
        encode_renew(xdr, clp->cl_clientid, &hdr);
        encode_nops(&hdr);
}
#endif /* CONFIG_NFS_V4_0 */

/*
 * a SETCLIENTID request
 */
static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
                                     struct xdr_stream *xdr,
                                     const void *data)
{
        const struct nfs4_setclientid *sc = data;
        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,
                                             const void *data)
{
        const struct nfs4_setclientid_res *arg = data;
        struct compound_hdr hdr = {
                .nops   = 0,
        };

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

/*
 * DELEGRETURN request
 */
static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
                                     struct xdr_stream *xdr,
                                     const void *data)
{
        const struct nfs4_delegreturnargs *args = data;
        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);
        if (args->lr_args)
                encode_layoutreturn(xdr, args->lr_args, &hdr);
        if (args->sattr_args)
                encode_delegattr(xdr, args->stateid, args->sattr_args, &hdr);
        if (args->bitmask)
                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,
                                      const void *data)
{
        const struct nfs4_fs_locations_arg *args = data;
        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);
        if (args->migration) {
                encode_putfh(xdr, args->fh, &hdr);
                replen = hdr.replen;
                encode_fs_locations(xdr, args->bitmask, &hdr);
                if (args->renew)
                        encode_renew(xdr, args->clientid, &hdr);
        } else {
                encode_putfh(xdr, args->dir_fh, &hdr);
                encode_lookup(xdr, args->name, &hdr);
                replen = hdr.replen;
                encode_fs_locations(xdr, args->bitmask, &hdr);
        }

        rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
                                PAGE_SIZE, replen);
        encode_nops(&hdr);
}

/*
 * Encode SECINFO request
 */
static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
                                struct xdr_stream *xdr,
                                const void *data)
{
        const struct nfs4_secinfo_arg *args = data;
        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);
}

/*
 * Encode FSID_PRESENT request
 */
static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      const void *data)
{
        const struct nfs4_fsid_present_arg *args = data;
        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_getfh(xdr, &hdr);
        if (args->renew)
                encode_renew(xdr, args->clientid, &hdr);
        encode_nops(&hdr);
}

/*
 * BIND_CONN_TO_SESSION request
 */
static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
                                struct xdr_stream *xdr,
                                const void *data)
{
        const struct nfs41_bind_conn_to_session_args *args = data;
        struct compound_hdr hdr = {
                .minorversion = args->client->cl_mvops->minor_version,
        };

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

/*
 * EXCHANGE_ID request
 */
static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
                                     struct xdr_stream *xdr,
                                     const void *data)
{
        const struct nfs41_exchange_id_args *args = data;
        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,
                                        const void *data)
{
        const struct nfs41_create_session_args *args = data;
        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,
                                         const void *data)
{
        const struct nfs4_session *session = data;
        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,
                                         const void *data)
{
        const struct nfs_client *clp = data;
        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,
                                  const void *data)
{
        const struct nfs4_sequence_args *args = data;
        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,
                                        const void *data)
{
        const struct nfs4_get_lease_time_args *args = data;
        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,
                                          const void *data)
{
        const struct nfs41_reclaim_complete_args *args = data;
        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 GETDEVICEINFO request
 */
static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
                                       struct xdr_stream *xdr,
                                       const void *data)
{
        const struct nfs4_getdeviceinfo_args *args = data;
        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);

        replen = hdr.replen + op_decode_hdr_maxsz + 2;

        encode_getdeviceinfo(xdr, args, &hdr);

        /* set up reply kvec. device_addr4 opaque data is read into the
         * pages */
        rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
                                args->pdev->pglen, replen);
        encode_nops(&hdr);
}

/*
 *  Encode LAYOUTGET request
 */
static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
                                   struct xdr_stream *xdr,
                                   const void *data)
{
        const struct nfs4_layoutget_args *args = data;
        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);

        rpc_prepare_reply_pages(req, args->layout.pages, 0,
                                args->layout.pglen, hdr.replen - pagepad_maxsz);
        encode_nops(&hdr);
}

/*
 *  Encode LAYOUTCOMMIT request
 */
static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      const void *priv)
{
        const struct nfs4_layoutcommit_args *args = priv;
        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,
                                      const void *data)
{
        const struct nfs4_layoutreturn_args *args = data;
        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 void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
                                        struct xdr_stream *xdr,
                                        const void *data)
{
        const struct nfs41_secinfo_no_name_args *args = data;
        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);
}

/*
 *  Encode TEST_STATEID request
 */
static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
                                      struct xdr_stream *xdr,
                                      const void *data)
{
        const struct nfs41_test_stateid_args *args = data;
        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,
                                     const void *data)
{
        const struct nfs41_free_stateid_args *args = data;
        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);
}

static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
{
        ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
                        NFS4_OPAQUE_LIMIT);
        if (unlikely(ret < 0))
                return -EIO;
        *len = ret;
        return 0;
}

static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
        ssize_t ret;
        void *ptr;
        u32 tmp;

        if (xdr_stream_decode_u32(xdr, &tmp) < 0)
                return -EIO;
        hdr->status = tmp;

        ret = xdr_stream_decode_opaque_inline(xdr, &ptr, NFS4_OPAQUE_LIMIT);
        if (ret < 0)
                return -EIO;
        hdr->taglen = ret;
        hdr->tag = ptr;

        if (xdr_stream_decode_u32(xdr, &tmp) < 0)
                return -EIO;
        hdr->nops = tmp;
        if (unlikely(hdr->nops < 1))
                return nfs4_stat_to_errno(hdr->status);
        return 0;
}

static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
                int *nfs_retval)
{
        __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 (unlikely(opnum != expected))
                goto out_bad_operation;
        if (unlikely(*p != cpu_to_be32(NFS_OK)))
                goto out_status;
        *nfs_retval = 0;
        return true;
out_status:
        nfserr = be32_to_cpup(p);
        trace_nfs4_xdr_status(xdr, opnum, nfserr);
        *nfs_retval = nfs4_stat_to_errno(nfserr);
        return true;
out_bad_operation:
        trace_nfs4_xdr_bad_operation(xdr, opnum, expected);
        *nfs_retval = -EREMOTEIO;
        return false;
out_overflow:
        *nfs_retval = -EIO;
        return false;
}

static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
{
        int retval;

        __decode_op_hdr(xdr, expected, &retval);
        return retval;
}

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

        p = xdr_inline_decode(xdr, 12);
        if (unlikely(!p))
                return -EIO;
        return decode_opaque_inline(xdr, &strlen, &str);
}

static ssize_t
decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
{
        ssize_t ret;

        ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
        if (likely(ret >= 0))
                return ret;
        if (ret != -EMSGSIZE)
                return -EIO;
        return sz;
}

static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
        ssize_t ret;
        ret = decode_bitmap4(xdr, bitmap, 3);
        return ret < 0 ? ret : 0;
}

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))
                return -EIO;
        *attrlen = be32_to_cpup(p);
        *savep = xdr_stream_pos(xdr);
        return 0;
}

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))
                        return -EIO;
                *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;
}

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))
                        return -EIO;
                *type = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
        }
        dprintk("%s: expire type=0x%x\n", __func__, *type);
        return 0;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
        }
        dprintk("%s: link support=%s\n", __func__, str_false_true(*res == 0));
        return 0;
}

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))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
        }
        dprintk("%s: symlink support=%s\n", __func__, str_false_true(*res == 0));
        return 0;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
        }
        dprintk("%s: lease time=%u\n", __func__, (unsigned int)*res);
        return 0;
}

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))
                        return -EIO;
                bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
                *res = -be32_to_cpup(p);
        }
        return 0;
}

static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
                                 uint32_t *bitmap, uint32_t *bitmask)
{
        if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
                int ret;
                ret = decode_attr_bitmap(xdr, bitmask);
                if (unlikely(ret < 0))
                        return ret;
                bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
        } 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_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
{
        __be32 *p;
        u32 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))
                        return -EIO;
                len = be32_to_cpup(p);
                if (len > NFS4_FHSIZE || len == 0) {
                        trace_nfs4_xdr_bad_filehandle(xdr, OP_READDIR,
                                                      NFS4ERR_BADHANDLE);
                        return -EREMOTEIO;
                }
                p = xdr_inline_decode(xdr, len);
                if (unlikely(!p))
                        return -EIO;
                if (fh != NULL) {
                        memcpy(fh->data, p, len);
                        fh->size = len;
                }
                bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
        }
        return 0;
}

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

        *res = 0;
        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))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
        }
        dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
        return 0;
}

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

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_CASE_INSENSITIVE - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_CASE_INSENSITIVE)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_CASE_INSENSITIVE;
        }
        dprintk("%s: case_insensitive=%s\n", __func__, str_false_true(*res == 0));
        return 0;
}

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

        *res = 0;
        if (unlikely(bitmap[0] & (FATTR4_WORD0_CASE_PRESERVING - 1U)))
                return -EIO;
        if (likely(bitmap[0] & FATTR4_WORD0_CASE_PRESERVING)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_CASE_PRESERVING;
        }
        dprintk("%s: case_preserving=%s\n", __func__, str_false_true(*res == 0));
        return 0;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
        }
        dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
        }
        dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
        }
        dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                return -EIO;
        n = be32_to_cpup(p);
        if (n == 0)
                goto root_path;
        dprintk("pathname4: ");
        if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
                dprintk("cannot parse %d components in path\n", n);
                goto out_eio;
        }
        for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
                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);
        }
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;
}

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;
        bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
        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_eio;
        n = be32_to_cpup(p);
        for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
                u32 m;
                struct nfs4_fs_location *loc;

                if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
                        break;
                loc = &res->locations[res->nlocations];
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        goto out_eio;
                m = be32_to_cpup(p);

                dprintk("%s: servers:\n", __func__);
                for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
                        struct nfs4_string *server;

                        if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
                                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;
                                }
                                break;
                        }
                        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);
                }
                status = decode_pathname(xdr, &loc->rootpath);
                if (unlikely(status != 0))
                        goto out_eio;
        }
        if (res->nlocations != 0)
                status = NFS_ATTR_FATTR_V4_LOCATIONS;
out:
        dprintk("%s: fs_locations done, error = %d\n", __func__, status);
        return status;
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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
        }
        dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                        return -EIO;
                *maxlink = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
        }
        dprintk("%s: maxlink=%u\n", __func__, *maxlink);
        return status;
}

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))
                        return -EIO;
                *maxname = be32_to_cpup(p);
                bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
        }
        dprintk("%s: maxname=%u\n", __func__, *maxname);
        return status;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                *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;
}

static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
                struct nfs4_string *name, gfp_t gfp_flags)
{
        ssize_t ret;

        ret = xdr_stream_decode_string_dup(xdr, &name->data,
                        XDR_MAX_NETOBJ, gfp_flags);
        name->len = 0;
        if (ret > 0)
                name->len = ret;
        return ret;
}

static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
                const struct nfs_server *server, kuid_t *uid,
                struct nfs4_string *owner_name)
{
        ssize_t len;
        char *p;

        *uid = make_kuid(&init_user_ns, -2);
        if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
                return -EIO;
        if (!(bitmap[1] & FATTR4_WORD1_OWNER))
                return 0;
        bitmap[1] &= ~FATTR4_WORD1_OWNER;

        if (owner_name != NULL) {
                len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
                if (len <= 0)
                        goto out;
                dprintk("%s: name=%s\n", __func__, owner_name->data);
                return NFS_ATTR_FATTR_OWNER_NAME;
        } else {
                len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
                                XDR_MAX_NETOBJ);
                if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
                        goto out;
                dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
                return NFS_ATTR_FATTR_OWNER;
        }
out:
        if (len == -EBADMSG)
                return -EIO;
        return 0;
}

static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
                const struct nfs_server *server, kgid_t *gid,
                struct nfs4_string *group_name)
{
        ssize_t len;
        char *p;

        *gid = make_kgid(&init_user_ns, -2);
        if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
                return -EIO;
        if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
                return 0;
        bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;

        if (group_name != NULL) {
                len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
                if (len <= 0)
                        goto out;
                dprintk("%s: name=%s\n", __func__, group_name->data);
                return NFS_ATTR_FATTR_GROUP_NAME;
        } else {
                len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
                                XDR_MAX_NETOBJ);
                if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
                        goto out;
                dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
                return NFS_ATTR_FATTR_GROUP;
        }
out:
        if (len == -EBADMSG)
                return -EIO;
        return 0;
}

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))
                        return -EIO;
                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;
}

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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
        }
        dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
        }
        dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                        return -EIO;
                xdr_decode_hyper(p, res);
                bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
        }
        dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
        return status;
}

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))
                        return -EIO;
                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;
}

static __be32 *
xdr_decode_nfstime4(__be32 *p, struct timespec64 *t)
{
        __u64 sec;

        p = xdr_decode_hyper(p, &sec);
        t-> tv_sec = sec;
        t->tv_nsec = be32_to_cpup(p++);
        return p;
}

static int decode_attr_time(struct xdr_stream *xdr, struct timespec64 *time)
{
        __be32 *p;

        p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
        if (unlikely(!p))
                return -EIO;
        xdr_decode_nfstime4(p, time);
        return 0;
}

static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *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=%lld\n", __func__, time->tv_sec);
        return status;
}

static int decode_attr_time_create(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
{
        int status = 0;

        time->tv_sec = 0;
        time->tv_nsec = 0;
        if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_CREATE - 1U)))
                return -EIO;
        if (likely(bitmap[1] & FATTR4_WORD1_TIME_CREATE)) {
                status = decode_attr_time(xdr, time);
                if (status == 0)
                        status = NFS_ATTR_FATTR_BTIME;
                bitmap[1] &= ~FATTR4_WORD1_TIME_CREATE;
        }
        dprintk("%s: btime=%lld\n", __func__, time->tv_sec);
        return status;
}

static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *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=%lld\n", __func__, time->tv_sec);
        return status;
}

static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
                                  struct timespec64 *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=%lld %ld\n", __func__, time->tv_sec,
                time->tv_nsec);
        return status;
}

static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
                                        struct nfs4_label *label)
{
        uint32_t pi = 0;
        uint32_t lfs = 0;
        __u32 len;
        __be32 *p;
        int status = 0;

        if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
                return -EIO;
        if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                lfs = be32_to_cpup(p++);
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                pi = be32_to_cpup(p++);
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                len = be32_to_cpup(p++);
                p = xdr_inline_decode(xdr, len);
                if (unlikely(!p))
                        return -EIO;
                bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
                if (len < NFS4_MAXLABELLEN) {
                        if (label && label->len) {
                                if (label->len < len)
                                        return -ERANGE;
                                memcpy(label->label, p, len);
                                label->len = len;
                                label->pi = pi;
                                label->lfs = lfs;
                                status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
                        }
                } else
                        printk(KERN_WARNING "%s: label too long (%u)!\n",
                                        __func__, len);
                if (label && label->label)
                        dprintk("%s: label=%.*s, len=%d, PI=%d, LFS=%d\n",
                                __func__, label->len, (char *)label->label,
                                label->len, label->pi, label->lfs);
        }
        return status;
}

static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *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=%lld\n", __func__, time->tv_sec);
        return status;
}

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

        *res = 0;
        if (unlikely(bitmap[2] & (FATTR4_WORD2_XATTR_SUPPORT - 1U)))
                return -EIO;
        if (likely(bitmap[2] & FATTR4_WORD2_XATTR_SUPPORT)) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[2] &= ~FATTR4_WORD2_XATTR_SUPPORT;
        }
        dprintk("%s: XATTR support=%s\n", __func__, str_false_true(*res == 0));
        return 0;
}

static int decode_attr_open_arguments(struct xdr_stream *xdr, uint32_t *bitmap,
                struct nfs4_open_caps *res)
{
        memset(res, 0, sizeof(*res));
        if (unlikely(bitmap[2] & (FATTR4_WORD2_OPEN_ARGUMENTS - 1U)))
                return -EIO;
        if (likely(bitmap[2] & FATTR4_WORD2_OPEN_ARGUMENTS)) {
                if (decode_bitmap4(xdr, res->oa_share_access, ARRAY_SIZE(res->oa_share_access)) < 0)
                        return -EIO;
                if (decode_bitmap4(xdr, res->oa_share_deny, ARRAY_SIZE(res->oa_share_deny)) < 0)
                        return -EIO;
                if (decode_bitmap4(xdr, res->oa_share_access_want, ARRAY_SIZE(res->oa_share_access_want)) < 0)
                        return -EIO;
                if (decode_bitmap4(xdr, res->oa_open_claim, ARRAY_SIZE(res->oa_open_claim)) < 0)
                        return -EIO;
                if (decode_bitmap4(xdr, res->oa_createmode, ARRAY_SIZE(res->oa_createmode)) < 0)
                        return -EIO;
                bitmap[2] &= ~FATTR4_WORD2_OPEN_ARGUMENTS;
        }
        return 0;
}

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))
                return -EIO;
        cinfo->atomic = be32_to_cpup(p++);
        p = xdr_decode_hyper(p, &cinfo->before);
        xdr_decode_hyper(p, &cinfo->after);
        return 0;
}

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))
                return -EIO;
        supp = be32_to_cpup(p++);
        acc = be32_to_cpup(p);
        *supported = supp;
        *access = acc;
        return 0;
}

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

static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
        stateid->type = NFS4_OPEN_STATEID_TYPE;
        return decode_stateid(xdr, stateid);
}

static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
        stateid->type = NFS4_LOCK_STATEID_TYPE;
        return decode_stateid(xdr, stateid);
}

static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
        stateid->type = NFS4_DELEGATION_STATEID_TYPE;
        return decode_stateid(xdr, stateid);
}

static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
        nfs4_stateid dummy;

        nfs4_stateid_copy(stateid, &invalid_stateid);
        return decode_stateid(xdr, &dummy);
}

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_invalid_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)
{
        struct nfs_writeverf *verf = res->verf;
        int status;

        status = decode_op_hdr(xdr, OP_COMMIT);
        if (!status)
                status = decode_write_verifier(xdr, &verf->verifier);
        if (!status)
                verf->committed = NFS_FILE_SYNC;
        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))
                return -EIO;
        bmlen = be32_to_cpup(p);
        p = xdr_inline_decode(xdr, bmlen << 2);
        if (likely(p))
                return 0;
        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;
        if ((status = decode_attr_case_insensitive(xdr, bitmap, &res->case_insensitive)) != 0)
                goto xdr_error;
        if ((status = decode_attr_case_preserving(xdr, bitmap, &res->case_preserving)) != 0)
                goto xdr_error;
        if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
                                res->exclcreat_bitmask)) != 0)
                goto xdr_error;
        if ((status = decode_attr_open_arguments(xdr, bitmap, &res->open_caps)) != 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;

        status = -EIO;
        if (unlikely(bitmap[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))
                        return -EIO;
                xdr_decode_hyper(p, res);
        }
        return 0;
}

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))
                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))
                        return -EIO;
                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;
}

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 = -EIO;
        if (unlikely(bitmap[0]))
                goto xdr_error;

        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_create(xdr, bitmap, &fattr->btime);
        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 = -EIO;
        if (unlikely(bitmap[1]))
                goto xdr_error;

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

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

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.
 */
static int decode_pnfs_layout_types(struct xdr_stream *xdr,
                                    struct nfs_fsinfo *fsinfo)
{
        __be32 *p;
        uint32_t i;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EIO;
        fsinfo->nlayouttypes = be32_to_cpup(p);

        /* pNFS is not supported by the underlying file system */
        if (fsinfo->nlayouttypes == 0)
                return 0;

        /* Decode and set first layout type, move xdr->p past unused types */
        p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
        if (unlikely(!p))
                return -EIO;

        /* If we get too many, then just cap it at the max */
        if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
                printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
                        __func__, fsinfo->nlayouttypes);
                fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
        }

        for(i = 0; i < fsinfo->nlayouttypes; ++i)
                fsinfo->layouttype[i] = be32_to_cpup(p++);
        return 0;
}

/*
 * 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,
                                struct nfs_fsinfo *fsinfo)
{
        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_pnfs_layout_types(xdr, fsinfo);
                bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
        }
        return status;
}

/*
 * The preferred 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))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
        }
        return 0;
}

/*
 * The granularity of a CLONE operation.
 */
static int decode_attr_clone_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_CLONE_BLKSIZE) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                *res = be32_to_cpup(p);
                bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
        }
        return 0;
}

static int decode_attr_change_attr_type(struct xdr_stream *xdr,
                                        uint32_t *bitmap,
                                        enum nfs4_change_attr_type *res)
{
        u32 tmp = NFS4_CHANGE_TYPE_IS_UNDEFINED;

        dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
        if (bitmap[2] & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
                if (xdr_stream_decode_u32(xdr, &tmp))
                        return -EIO;
                bitmap[2] &= ~FATTR4_WORD2_CHANGE_ATTR_TYPE;
        }

        switch(tmp) {
        case NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR:
        case NFS4_CHANGE_TYPE_IS_VERSION_COUNTER:
        case NFS4_CHANGE_TYPE_IS_VERSION_COUNTER_NOPNFS:
        case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
                *res = tmp;
                break;
        default:
                *res = NFS4_CHANGE_TYPE_IS_UNDEFINED;
        }
        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 = -EIO;
        if (unlikely(bitmap[0]))
                goto xdr_error;

        status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
        if (status != 0)
                goto xdr_error;
        status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
        if (status != 0)
                goto xdr_error;

        status = -EIO;
        if (unlikely(bitmap[1]))
                goto xdr_error;

        status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
        if (status)
                goto xdr_error;
        status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
        if (status)
                goto xdr_error;

        status = decode_attr_change_attr_type(xdr, bitmap,
                                              &fsinfo->change_attr_type);
        if (status)
                goto xdr_error;

        status = decode_attr_xattrsupport(xdr, bitmap,
                                          &fsinfo->xattr_support);
        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))
                return -EIO;
        len = be32_to_cpup(p);
        if (len > NFS4_FHSIZE || len == 0) {
                trace_nfs4_xdr_bad_filehandle(xdr, OP_GETFH, NFS4ERR_BADHANDLE);
                return -EREMOTEIO;
        }
        fh->size = len;
        p = xdr_inline_decode(xdr, len);
        if (unlikely(!p))
                return -EIO;
        memcpy(fh->data, p, len);
        return 0;
}

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))
                return -EIO;
        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->c.flc_type = F_WRLCK;
                if (type & 1)
                        fl->c.flc_type = F_RDLCK;
                fl->c.flc_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 -EIO;
        return -NFS4ERR_DENIED;
}

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_lock_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_lock_stateid(xdr, &res->stateid);
        return status;
}

#if defined(CONFIG_NFS_V4_0)
static int decode_release_lockowner(struct xdr_stream *xdr)
{
        return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
}
#endif /* CONFIG_NFS_V4_0 */

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

static int decode_lookupp(struct xdr_stream *xdr)
{
        return decode_op_hdr(xdr, OP_LOOKUPP);
}

/* This is too sick! */
static int decode_space_limit(struct xdr_stream *xdr,
                unsigned long *pagemod_limit)
{
        __be32 *p;
        uint32_t limit_type, nblocks, blocksize;
        u64 maxsize = 0;

        p = xdr_inline_decode(xdr, 12);
        if (unlikely(!p))
                return -EIO;
        limit_type = be32_to_cpup(p++);
        switch (limit_type) {
        case NFS4_LIMIT_SIZE:
                xdr_decode_hyper(p, &maxsize);
                break;
        case NFS4_LIMIT_BLOCKS:
                nblocks = be32_to_cpup(p++);
                blocksize = be32_to_cpup(p);
                maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
        }
        maxsize >>= PAGE_SHIFT;
        *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
        return 0;
}

static int decode_rw_delegation(struct xdr_stream *xdr,
                struct nfs4_open_delegation *res)
{
        __be32 *p;
        int status;

        status = decode_delegation_stateid(xdr, &res->stateid);
        if (unlikely(status))
                return status;
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EIO;
        res->do_recall = be32_to_cpup(p);

        switch (res->open_delegation_type) {
        case NFS4_OPEN_DELEGATE_READ:
        case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
                res->type = FMODE_READ;
                break;
        case NFS4_OPEN_DELEGATE_WRITE:
        case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
                res->type = FMODE_WRITE|FMODE_READ;
                if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
                                return -EIO;
        }
        return decode_ace(xdr, NULL);
}

static int decode_no_delegation(struct xdr_stream *xdr,
                struct nfs4_open_delegation *res)
{
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EIO;
        res->why_no_delegation = be32_to_cpup(p);
        switch (res->why_no_delegation) {
                case WND4_CONTENTION:
                case WND4_RESOURCE:
                        p = xdr_inline_decode(xdr, 4);
                        if (unlikely(!p))
                                return -EIO;
                        res->will_notify = be32_to_cpup(p);
        }
        return 0;
}

static int decode_delegation(struct xdr_stream *xdr,
                struct nfs4_open_delegation *res)
{
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EIO;
        res->open_delegation_type = be32_to_cpup(p);
        switch (res->open_delegation_type) {
        case NFS4_OPEN_DELEGATE_NONE:
                return 0;
        case NFS4_OPEN_DELEGATE_READ:
        case NFS4_OPEN_DELEGATE_WRITE:
        case NFS4_OPEN_DELEGATE_READ_ATTRS_DELEG:
        case NFS4_OPEN_DELEGATE_WRITE_ATTRS_DELEG:
                return decode_rw_delegation(xdr, res);
        case NFS4_OPEN_DELEGATE_NONE_EXT:
                return decode_no_delegation(xdr, res);
        }
        return -EIO;
}

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

        if (!__decode_op_hdr(xdr, OP_OPEN, &status))
                return status;
        nfs_increment_open_seqid(status, res->seqid);
        if (status)
                return status;
        status = decode_open_stateid(xdr, &res->stateid);
        if (unlikely(status))
                return status;

        decode_change_info(xdr, &res->cinfo);

        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                return -EIO;
        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))
                return -EIO;
        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->delegation);
xdr_error:
        dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
        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_open_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_open_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_pgio_res *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))
                return -EIO;
        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;
}

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))
                return -EIO;
        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 null-terminate the text (the VFS expects
         * null-termination).
         */
        xdr_terminate_string(rcvbuf, len);
        return 0;
}

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, enum nfs4_acl_type type)
{
        unsigned int savep;
        uint32_t attrlen,
                 bitmap[3] = {0};
        int status;

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

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

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

        switch (type) {
        default:
                if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
                        return -EIO;
                if (!(bitmap[0] & FATTR4_WORD0_ACL))
                        return -EOPNOTSUPP;
                break;
        case NFS4ACL_DACL:
                if (unlikely(bitmap[0] || bitmap[1] & (FATTR4_WORD1_DACL - 1U)))
                        return -EIO;
                if (!(bitmap[1] & FATTR4_WORD1_DACL))
                        return -EOPNOTSUPP;
                break;
        case NFS4ACL_SACL:
                if (unlikely(bitmap[0] || bitmap[1] & (FATTR4_WORD1_SACL - 1U)))
                        return -EIO;
                if (!(bitmap[1] & FATTR4_WORD1_SACL))
                        return -EOPNOTSUPP;
        }

        /* 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_page_pos(xdr);
        res->acl_len = attrlen;

        /* Check for receive buffer overflow */
        if (res->acl_len > xdr_stream_remaining(xdr) ||
            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 %zu\n",
                        attrlen, xdr_stream_remaining(xdr));
        }
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)
{
        int status;

        status = decode_op_hdr(xdr, OP_SETATTR);
        if (status)
                return status;
        if (decode_bitmap4(xdr, NULL, 0) >= 0)
                return 0;
        return -EIO;
}

static int decode_delegattr(struct xdr_stream *xdr)
{
        return decode_setattr(xdr);
}

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))
                return -EIO;
        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))
                        return -EIO;
                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))
                        return -EIO;
                len = be32_to_cpup(p);
                p = xdr_inline_decode(xdr, len);
                if (unlikely(!p))
                        return -EIO;

                /* skip uaddr string */
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EIO;
                len = be32_to_cpup(p);
                p = xdr_inline_decode(xdr, len);
                if (unlikely(!p))
                        return -EIO;
                return -NFSERR_CLID_INUSE;
        } else
                return nfs4_stat_to_errno(nfserr);

        return 0;
}

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_pgio_res *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))
                return -EIO;
        res->count = be32_to_cpup(p++);
        res->verf->committed = be32_to_cpup(p++);
        return decode_write_verifier(xdr, &res->verf->verifier);
}

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_secinfo4 *flavor)
{
        u32 oid_len;
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EIO;
        oid_len = be32_to_cpup(p);
        if (oid_len > GSS_OID_MAX_LEN)
                return -EINVAL;

        p = xdr_inline_decode(xdr, oid_len);
        if (unlikely(!p))
                return -EIO;
        memcpy(flavor->flavor_info.oid.data, p, oid_len);
        flavor->flavor_info.oid.len = oid_len;

        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                return -EIO;
        flavor->flavor_info.qop = be32_to_cpup(p++);
        flavor->flavor_info.service = be32_to_cpup(p);

        return 0;
}

static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
{
        struct nfs4_secinfo4 *sec_flavor;
        unsigned int i, num_flavors;
        int status;
        __be32 *p;

        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EIO;

        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))
                        return -EIO;
                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;
}

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);
}

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_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
{
        if (xdr_stream_decode_uint32_array(xdr, op_map->u.words,
                                           ARRAY_SIZE(op_map->u.words)) < 0)
                return -EIO;
        return 0;
}

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

        res->state_protect.how = be32_to_cpup(p);
        switch (res->state_protect.how) {
        case SP4_NONE:
                break;
        case SP4_MACH_CRED:
                status = decode_op_map(xdr, &res->state_protect.enforce);
                if (status)
                        return status;
                status = decode_op_map(xdr, &res->state_protect.allow);
                if (status)
                        return status;
                break;
        default:
                WARN_ON_ONCE(1);
                return -EIO;
        }

        /* server_owner4.so_minor_id */
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                return -EIO;
        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;
        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;
        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))
                return -EIO;
        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;
                memcpy(res->impl_id->domain, dummy_str, dummy);

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

                /* nii_date */
                p = xdr_inline_decode(xdr, 12);
                if (unlikely(!p))
                        return -EIO;
                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;
}

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))
                return -EIO;
        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))
                        return -EIO;
        }
        return 0;
}

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->sessionid);
        if (unlikely(status))
                return status;

        /* dir flags, rdma mode bool */
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                return -EIO;

        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;
}

static int decode_create_session(struct xdr_stream *xdr,
                                 struct nfs41_create_session_res *res)
{
        __be32 *p;
        int status;

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

        /* seqid, flags */
        p = xdr_inline_decode(xdr, 8);
        if (unlikely(!p))
                return -EIO;
        res->seqid = be32_to_cpup(p++);
        res->flags = be32_to_cpup(p);

        /* Channel attributes */
        status = decode_chan_attrs(xdr, &res->fc_attrs);
        if (!status)
                status = decode_chan_attrs(xdr, &res->bc_attrs);
        return status;
}

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);
}

static int decode_sequence(struct xdr_stream *xdr,
                           struct nfs4_sequence_res *res,
                           struct rpc_rqst *rqstp)
{
        struct nfs4_session *session;
        struct nfs4_sessionid id;
        u32 dummy;
        int status;
        __be32 *p;

        if (res->sr_slot == NULL)
                return 0;
        if (!res->sr_slot->table->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;
        session = res->sr_slot->table->session;

        if (memcmp(id.data, 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->slot_nr) {
                dprintk("%s Invalid slot id\n", __func__);
                goto out_err;
        }
        /* highest slot id */
        res->sr_highest_slotid = be32_to_cpup(p++);
        /* target highest slot id */
        res->sr_target_highest_slotid = 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:
        status = -EIO;
        goto out_err;
}

static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
{
        stateid->type = NFS4_LAYOUT_STATEID_TYPE;
        return decode_stateid(xdr, stateid);
}

static int decode_get_dir_delegation(struct xdr_stream *xdr,
                                     struct nfs4_getattr_res *res)
{
        struct nfs4_gdd_res *gdd_res = res->gdd_res;
        nfs4_verifier cookieverf;
        u32 bitmap[1];
        int status;

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

        if (xdr_stream_decode_u32(xdr, &gdd_res->status))
                return -EIO;

        if (gdd_res->status == GDD4_UNAVAIL)
                return xdr_inline_decode(xdr, 4) ? 0 : -EIO;

        status = decode_verifier(xdr, &cookieverf);
        if (status)
                return status;

        status = decode_delegation_stateid(xdr, &gdd_res->deleg);
        if (status)
                return status;

        /* Decode supported notification types. */
        status = decode_bitmap4(xdr, bitmap, ARRAY_SIZE(bitmap));
        if (status < 0)
                return status;

        /* Decode supported child attributes. */
        status = decode_bitmap4(xdr, bitmap, ARRAY_SIZE(bitmap));
        if (status < 0)
                return status;

        /* Decode supported attributes. */
        status = decode_bitmap4(xdr, bitmap, ARRAY_SIZE(bitmap));
        if (status < 0)
                return status;
        return 0;
}

static int decode_getdeviceinfo(struct xdr_stream *xdr,
                                struct nfs4_getdeviceinfo_res *res)
{
        struct pnfs_device *pdev = res->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))
                                return -EIO;
                        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))
                return -EIO;
        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)
                return -EIO;

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

                p = xdr_inline_decode(xdr, 4 * len);
                if (unlikely(!p))
                        return -EIO;

                res->notification = be32_to_cpup(p++);
                for (i = 1; i < len; i++) {
                        if (be32_to_cpup(p++)) {
                                dprintk("%s: unsupported notification\n",
                                        __func__);
                                return -EIO;
                        }
                }
        }
        return 0;
}

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)
                goto out;
        p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                goto out_overflow;
        res->return_on_close = be32_to_cpup(p);
        decode_layout_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__);
                status = -EINVAL;
                goto out;
        }

        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);
                status = -EINVAL;
                goto out;
        }

        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);
        }

out:
        res->status = status;
        return status;
out_overflow:
        status = -EIO;
        goto out;
}

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))
                return -EIO;
        res->lrs_present = be32_to_cpup(p);
        if (res->lrs_present)
                status = decode_layout_stateid(xdr, &res->stateid);
        else
                nfs4_stateid_copy(&res->stateid, &invalid_stateid);
        return status;
}

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))
                return -EIO;
        sizechanged = be32_to_cpup(p);

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

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))
                return -EIO;
        num_res = be32_to_cpup(p++);
        if (num_res != 1)
                return -EIO;

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

        return status;
}

static int decode_free_stateid(struct xdr_stream *xdr,
                               struct nfs41_free_stateid_res *res)
{
        res->status = decode_op_hdr(xdr, OP_FREE_STATEID);
        return res->status;
}

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

/*
 * Decode OPEN_DOWNGRADE response
 */
static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
                                       struct xdr_stream *xdr,
                                       void *data)
{
        struct nfs_closeres *res = data;
        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;
        if (res->lr_res) {
                status = decode_layoutreturn(xdr, res->lr_res);
                res->lr_ret = status;
                if (status)
                        goto out;
        }
        status = decode_open_downgrade(xdr, res);
out:
        return status;
}

/*
 * Decode ACCESS response
 */
static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                               void *data)
{
        struct nfs4_accessres *res = data;
        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;
        if (res->fattr)
                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,
                               void *data)
{
        struct nfs4_lookup_res *res = data;
        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 LOOKUPP response
 */
static int nfs4_xdr_dec_lookupp(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                void *data)
{
        struct nfs4_lookupp_res *res = data;
        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_lookupp(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,
                                    void *data)
{
        struct nfs4_lookup_res *res = data;
        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,
                               void *data)
{
        struct nfs_removeres *res = data;
        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,
                               void *data)
{
        struct nfs_renameres *res = data;
        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,
                             void *data)
{
        struct nfs4_link_res *res = data;
        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,
                               void *data)
{
        struct nfs4_create_res *res = data;
        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,
                                void *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,
                                void *data)
{
        struct nfs4_getattr_res *res = data;
        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;
        if (res->gdd_res) {
                status = decode_get_dir_delegation(xdr, res);
                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,
                                const void *data)
{
        const struct nfs_setaclargs *args = data;
        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,
                    void *data)
{
        struct nfs_setaclres *res = data;
        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,
                    void *data)
{
        struct nfs_getaclres *res = data;
        struct compound_hdr hdr;
        int status;

        if (res->acl_scratch != NULL)
                xdr_set_scratch_folio(xdr, res->acl_scratch);
        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, res->acl_type);

out:
        return status;
}

/*
 * Decode CLOSE response
 */
static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                              void *data)
{
        struct nfs_closeres *res = data;
        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;
        if (res->lr_res) {
                status = decode_layoutreturn(xdr, res->lr_res);
                res->lr_ret = status;
                if (status)
                        goto out;
        }
        if (res->fattr != NULL) {
                status = decode_getfattr(xdr, res->fattr, res->server);
                if (status != 0)
                        goto out;
        }
        status = decode_close(xdr, res);
out:
        return status;
}

/*
 * Decode OPEN response
 */
static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
                             void *data)
{
        struct nfs_openres *res = data;
        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);
        if (res->lg_res)
                decode_layoutget(xdr, rqstp, res->lg_res);
out:
        return status;
}

/*
 * Decode OPEN_CONFIRM response
 */
static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
                                     struct xdr_stream *xdr,
                                     void *data)
{
        struct nfs_open_confirmres *res = data;
        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,
                                    void *data)
{
        struct nfs_openres *res = data;
        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);
        if (res->lg_res)
                decode_layoutget(xdr, rqstp, res->lg_res);
out:
        return status;
}

/*
 * Decode SETATTR response
 */
static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
                                struct xdr_stream *xdr,
                                void *data)
{
        struct nfs_setattrres *res = data;
        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,
                             void *data)
{
        struct nfs_lock_res *res = data;
        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,
                              void *data)
{
        struct nfs_lockt_res *res = data;
        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,
                              void *data)
{
        struct nfs_locku_res *res = data;
        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;
}

#if defined(CONFIG_NFS_V4_0)
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;
}
#endif /* CONFIG_NFS_V4_0 */

/*
 * Decode READLINK response
 */
static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
                                 struct xdr_stream *xdr,
                                 void *data)
{
        struct nfs4_readlink_res *res = data;
        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,
                                void *data)
{
        struct nfs4_readdir_res *res = data;
        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,
                             void *data)
{
        struct nfs_pgio_res *res = data;
        struct compound_hdr hdr;
        int status;

        status = decode_compound_hdr(xdr, &hdr);
        res->op_status = hdr.status;
        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,
                              void *data)
{
        struct nfs_pgio_res *res = data;
        struct compound_hdr hdr;
        int status;

        status = decode_compound_hdr(xdr, &hdr);
        res->op_status = hdr.status;
        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,
                               void *data)
{
        struct nfs_commitres *res = data;
        struct compound_hdr hdr;
        int status;

        status = decode_compound_hdr(xdr, &hdr);
        res->op_status = hdr.status;
        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,
                               void *data)
{
        struct nfs4_fsinfo_res *res = data;
        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,
                                 void *data)
{
        struct nfs4_pathconf_res *res = data;
        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,
                               void *data)
{
        struct nfs4_statfs_res *res = data;
        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,
                                    void *data)
{
        struct nfs4_server_caps_res *res = data;
        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
 */
#if defined(CONFIG_NFS_V4_0)
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;
}
#endif /* CONFIG_NFS_V4_0 */

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

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

/*
 * Decode DELEGRETURN response
 */
static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
                                    struct xdr_stream *xdr,
                                    void *data)
{
        struct nfs4_delegreturnres *res = data;
        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;
        if (res->lr_res) {
                status = decode_layoutreturn(xdr, res->lr_res);
                res->lr_ret = status;
                if (status)
                        goto out;
        }
        if (res->sattr_res) {
                status = decode_delegattr(xdr);
                res->sattr_ret = status;
                if (status)
                        goto out;
        }
        if (res->fattr) {
                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,
                                     void *data)
{
        struct nfs4_fs_locations_res *res = data;
        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;
        if (res->migration) {
                xdr_enter_page(xdr, PAGE_SIZE);
                status = decode_getfattr_generic(xdr,
                                        res->fs_locations->fattr,
                                         NULL, res->fs_locations,
                                         res->fs_locations->server);
                if (status)
                        goto out;
                if (res->renew)
                        status = decode_renew(xdr);
        } else {
                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,
                                void *data)
{
        struct nfs4_secinfo_res *res = data;
        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;
}

/*
 * Decode FSID_PRESENT response
 */
static int nfs4_xdr_dec_fsid_present(struct rpc_rqst *rqstp,
                                     struct xdr_stream *xdr,
                                     void *data)
{
        struct nfs4_fsid_present_res *res = data;
        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_getfh(xdr, res->fh);
        if (status)
                goto out;
        if (res->renew)
                status = decode_renew(xdr);
out:
        return status;
}

/*
 * 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,
                                       void *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,
                                 void *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,
                                       void *data)
{
        struct nfs4_get_lease_time_res *res = data;
        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,
                                         void *data)
{
        struct nfs41_reclaim_complete_res *res = data;
        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, NULL);
        return status;
}

/*
 * Decode GETDEVINFO response
 */
static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
                                      struct xdr_stream *xdr,
                                      void *data)
{
        struct nfs4_getdeviceinfo_res *res = data;
        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);
out:
        return status;
}

/*
 * Decode LAYOUTGET response
 */
static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
                                  struct xdr_stream *xdr,
                                  void *data)
{
        struct nfs4_layoutget_res *res = data;
        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,
                                     void *data)
{
        struct nfs4_layoutreturn_res *res = data;
        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,
                                     void *data)
{
        struct nfs4_layoutcommit_res *res = data;
        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,
                                        void *data)
{
        struct nfs4_secinfo_res *res = data;
        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,
                                     void *data)
{
        struct nfs41_test_stateid_res *res = data;
        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,
                                     void *data)
{
        struct nfs41_free_stateid_res *res = data;
        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;
}

/**
 * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
 *                      the local page cache.
 * @xdr: XDR stream where entry resides
 * @entry: buffer to fill in with entry data
 * @plus: boolean indicating whether this should be a readdirplus entry
 *
 * Returns zero if successful, otherwise a negative errno value is
 * returned.
 *
 * This function is not invoked during READDIR reply decoding, but
 * rather whenever an application invokes the getdents(2) system call
 * on a directory already in our cache.
 */
int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
                       bool plus)
{
        unsigned int savep;
        uint32_t bitmap[3] = {0};
        uint32_t len;
        uint64_t new_cookie;
        __be32 *p = xdr_inline_decode(xdr, 4);
        if (unlikely(!p))
                return -EAGAIN;
        if (*p == xdr_zero) {
                p = xdr_inline_decode(xdr, 4);
                if (unlikely(!p))
                        return -EAGAIN;
                if (*p == xdr_zero)
                        return -EAGAIN;
                entry->eof = 1;
                return -EBADCOOKIE;
        }

        p = xdr_inline_decode(xdr, 12);
        if (unlikely(!p))
                return -EAGAIN;
        p = xdr_decode_hyper(p, &new_cookie);
        entry->len = be32_to_cpup(p);

        p = xdr_inline_decode(xdr, entry->len);
        if (unlikely(!p))
                return -EAGAIN;
        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)
                return -EAGAIN;

        if (decode_attr_length(xdr, &len, &savep) < 0)
                return -EAGAIN;

        if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
                        NULL, entry->server) < 0)
                return -EAGAIN;
        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);

        entry->cookie = new_cookie;

        return 0;
}

#ifdef CONFIG_NFS_V4_2
#include "nfs42xdr.c"
#endif /* CONFIG_NFS_V4_2 */

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

#define STUB(proc)              \
[NFSPROC4_CLNT_##proc] = {      \
        .p_name = #proc,        \
}

#if defined(CONFIG_NFS_V4_0)
#define PROC40(proc, argtype, restype)                          \
        PROC(proc, argtype, restype)
#else
#define PROC40(proc, argtype, restype)                          \
        STUB(proc)
#endif /* CONFIG_NFS_V4_0 */

#define PROC41(proc, argtype, restype)                          \
        PROC(proc, argtype, restype)

#if defined(CONFIG_NFS_V4_2)
#define PROC42(proc, argtype, restype)                          \
        PROC(proc, argtype, restype)
#else
#define PROC42(proc, argtype, restype)                          \
        STUB(proc)
#endif

const 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),
        PROC40(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),
        PROC40(RELEASE_LOCKOWNER,       enc_release_lockowner,  dec_release_lockowner),
        PROC(SECINFO,           enc_secinfo,            dec_secinfo),
        PROC(FSID_PRESENT,      enc_fsid_present,       dec_fsid_present),
        PROC41(EXCHANGE_ID,     enc_exchange_id,        dec_exchange_id),
        PROC41(CREATE_SESSION,  enc_create_session,     dec_create_session),
        PROC41(DESTROY_SESSION, enc_destroy_session,    dec_destroy_session),
        PROC41(SEQUENCE,        enc_sequence,           dec_sequence),
        PROC(GET_LEASE_TIME,    enc_get_lease_time,     dec_get_lease_time),
        PROC41(RECLAIM_COMPLETE,enc_reclaim_complete,   dec_reclaim_complete),
        PROC41(GETDEVICEINFO,   enc_getdeviceinfo,      dec_getdeviceinfo),
        PROC41(LAYOUTGET,       enc_layoutget,          dec_layoutget),
        PROC41(LAYOUTCOMMIT,    enc_layoutcommit,       dec_layoutcommit),
        PROC41(LAYOUTRETURN,    enc_layoutreturn,       dec_layoutreturn),
        PROC41(SECINFO_NO_NAME, enc_secinfo_no_name,    dec_secinfo_no_name),
        PROC41(TEST_STATEID,    enc_test_stateid,       dec_test_stateid),
        PROC41(FREE_STATEID,    enc_free_stateid,       dec_free_stateid),
        STUB(GETDEVICELIST),
        PROC41(BIND_CONN_TO_SESSION,
                        enc_bind_conn_to_session, dec_bind_conn_to_session),
        PROC41(DESTROY_CLIENTID,enc_destroy_clientid,   dec_destroy_clientid),
        PROC42(SEEK,            enc_seek,               dec_seek),
        PROC42(ALLOCATE,        enc_allocate,           dec_allocate),
        PROC42(DEALLOCATE,      enc_deallocate,         dec_deallocate),
        PROC42(LAYOUTSTATS,     enc_layoutstats,        dec_layoutstats),
        PROC42(CLONE,           enc_clone,              dec_clone),
        PROC42(COPY,            enc_copy,               dec_copy),
        PROC42(OFFLOAD_CANCEL,  enc_offload_cancel,     dec_offload_cancel),
        PROC42(OFFLOAD_STATUS,  enc_offload_status,     dec_offload_status),
        PROC42(COPY_NOTIFY,     enc_copy_notify,        dec_copy_notify),
        PROC(LOOKUPP,           enc_lookupp,            dec_lookupp),
        PROC42(LAYOUTERROR,     enc_layouterror,        dec_layouterror),
        PROC42(GETXATTR,        enc_getxattr,           dec_getxattr),
        PROC42(SETXATTR,        enc_setxattr,           dec_setxattr),
        PROC42(LISTXATTRS,      enc_listxattrs,         dec_listxattrs),
        PROC42(REMOVEXATTR,     enc_removexattr,        dec_removexattr),
        PROC42(READ_PLUS,       enc_read_plus,          dec_read_plus),
        PROC42(ZERO_RANGE,      enc_zero_range,         dec_zero_range),
};

static unsigned int nfs_version4_counts[ARRAY_SIZE(nfs4_procedures)];
const struct rpc_version nfs_version4 = {
        .number                 = 4,
        .nrprocs                = ARRAY_SIZE(nfs4_procedures),
        .procs                  = nfs4_procedures,
        .counts                 = nfs_version4_counts,
};