nfs4xdr.c 159 KB
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/*
 *  fs/nfs/nfs4xdr.c
 *
 *  Client-side XDR for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
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 *
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 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

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

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static int nfs4_stat_to_errno(int);
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/* NFSv4 COMPOUND tags are only wanted for debugging purposes */
#ifdef DEBUG
#define NFS4_MAXTAGLEN		20
#else
#define NFS4_MAXTAGLEN		0
#endif

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/* lock,open owner id:
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 * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
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 */
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#define open_owner_id_maxsz	(1 + 4)
#define lock_owner_id_maxsz	(1 + 4)
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#define decode_lockowner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
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#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)
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#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))
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#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))
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#define nfs4_fattr_bitmap_maxsz 3
#define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
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#define nfs4_name_maxsz		(1 + ((3 + NFS4_MAXNAMLEN) >> 2))
#define nfs4_path_maxsz		(1 + ((3 + NFS4_MAXPATHLEN) >> 2))
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#define nfs4_owner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
#define nfs4_group_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
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/* 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 + \
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				3 + 3 + 3 + nfs4_owner_maxsz + nfs4_group_maxsz))
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#define nfs4_fattr_maxsz	(nfs4_fattr_bitmap_maxsz + \
				nfs4_fattr_value_maxsz)
#define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
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#define encode_attrs_maxsz	(nfs4_fattr_bitmap_maxsz + \
				 1 + 2 + 1 + \
				nfs4_owner_maxsz + \
				nfs4_group_maxsz + \
				4 + 4)
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#define encode_savefh_maxsz     (op_encode_hdr_maxsz)
#define decode_savefh_maxsz     (op_decode_hdr_maxsz)
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#define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
#define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
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#define encode_fsinfo_maxsz	(encode_getattr_maxsz)
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#define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + 11)
#define encode_renew_maxsz	(op_encode_hdr_maxsz + 3)
#define decode_renew_maxsz	(op_decode_hdr_maxsz)
#define encode_setclientid_maxsz \
				(op_encode_hdr_maxsz + \
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				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
				XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
				1 /* sc_prog */ + \
				XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
				XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
				1) /* sc_cb_ident */
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#define decode_setclientid_maxsz \
				(op_decode_hdr_maxsz + \
				2 + \
				1024) /* large value for CLID_INUSE */
#define encode_setclientid_confirm_maxsz \
				(op_encode_hdr_maxsz + \
				3 + (NFS4_VERIFIER_SIZE >> 2))
#define decode_setclientid_confirm_maxsz \
				(op_decode_hdr_maxsz)
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#define encode_lookup_maxsz	(op_encode_hdr_maxsz + nfs4_name_maxsz)
#define decode_lookup_maxsz	(op_decode_hdr_maxsz)
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#define encode_share_access_maxsz \
				(2)
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#define encode_createmode_maxsz	(1 + encode_attrs_maxsz + encode_verifier_maxsz)
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#define encode_opentype_maxsz	(1 + encode_createmode_maxsz)
#define encode_claim_null_maxsz	(1 + nfs4_name_maxsz)
#define encode_open_maxsz	(op_encode_hdr_maxsz + \
				2 + encode_share_access_maxsz + 2 + \
				open_owner_id_maxsz + \
				encode_opentype_maxsz + \
				encode_claim_null_maxsz)
#define decode_ace_maxsz	(3 + nfs4_owner_maxsz)
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#define decode_delegation_maxsz	(1 + decode_stateid_maxsz + 1 + \
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				decode_ace_maxsz)
#define decode_change_info_maxsz	(5)
#define decode_open_maxsz	(op_decode_hdr_maxsz + \
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				decode_stateid_maxsz + \
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				decode_change_info_maxsz + 1 + \
				nfs4_fattr_bitmap_maxsz + \
				decode_delegation_maxsz)
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#define encode_open_confirm_maxsz \
				(op_encode_hdr_maxsz + \
				 encode_stateid_maxsz + 1)
#define decode_open_confirm_maxsz \
				(op_decode_hdr_maxsz + \
				 decode_stateid_maxsz)
#define encode_open_downgrade_maxsz \
				(op_encode_hdr_maxsz + \
				 encode_stateid_maxsz + 1 + \
				 encode_share_access_maxsz)
#define decode_open_downgrade_maxsz \
				(op_decode_hdr_maxsz + \
				 decode_stateid_maxsz)
#define encode_close_maxsz	(op_encode_hdr_maxsz + \
				 1 + encode_stateid_maxsz)
#define decode_close_maxsz	(op_decode_hdr_maxsz + \
				 decode_stateid_maxsz)
#define encode_setattr_maxsz	(op_encode_hdr_maxsz + \
				 encode_stateid_maxsz + \
				 encode_attrs_maxsz)
#define decode_setattr_maxsz	(op_decode_hdr_maxsz + \
				 nfs4_fattr_bitmap_maxsz)
#define encode_read_maxsz	(op_encode_hdr_maxsz + \
				 encode_stateid_maxsz + 3)
#define decode_read_maxsz	(op_decode_hdr_maxsz + 2)
#define encode_readdir_maxsz	(op_encode_hdr_maxsz + \
				 2 + encode_verifier_maxsz + 5)
#define decode_readdir_maxsz	(op_decode_hdr_maxsz + \
				 decode_verifier_maxsz)
#define encode_readlink_maxsz	(op_encode_hdr_maxsz)
#define decode_readlink_maxsz	(op_decode_hdr_maxsz + 1)
#define encode_write_maxsz	(op_encode_hdr_maxsz + \
				 encode_stateid_maxsz + 4)
#define decode_write_maxsz	(op_decode_hdr_maxsz + \
				 2 + decode_verifier_maxsz)
#define encode_commit_maxsz	(op_encode_hdr_maxsz + 3)
#define decode_commit_maxsz	(op_decode_hdr_maxsz + \
				 decode_verifier_maxsz)
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#define encode_remove_maxsz	(op_encode_hdr_maxsz + \
				nfs4_name_maxsz)
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#define decode_remove_maxsz	(op_decode_hdr_maxsz + \
				 decode_change_info_maxsz)
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#define encode_rename_maxsz	(op_encode_hdr_maxsz + \
				2 * nfs4_name_maxsz)
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#define decode_rename_maxsz	(op_decode_hdr_maxsz + \
				 decode_change_info_maxsz + \
				 decode_change_info_maxsz)
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#define encode_link_maxsz	(op_encode_hdr_maxsz + \
				nfs4_name_maxsz)
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#define decode_link_maxsz	(op_decode_hdr_maxsz + decode_change_info_maxsz)
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#define encode_lockowner_maxsz	(7)
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#define encode_lock_maxsz	(op_encode_hdr_maxsz + \
				 7 + \
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				 1 + encode_stateid_maxsz + 1 + \
				 encode_lockowner_maxsz)
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#define decode_lock_denied_maxsz \
				(8 + decode_lockowner_maxsz)
#define decode_lock_maxsz	(op_decode_hdr_maxsz + \
				 decode_lock_denied_maxsz)
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#define encode_lockt_maxsz	(op_encode_hdr_maxsz + 5 + \
				encode_lockowner_maxsz)
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#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)
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#define encode_release_lockowner_maxsz \
				(op_encode_hdr_maxsz + \
				 encode_lockowner_maxsz)
#define decode_release_lockowner_maxsz \
				(op_decode_hdr_maxsz)
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#define encode_access_maxsz	(op_encode_hdr_maxsz + 1)
#define decode_access_maxsz	(op_decode_hdr_maxsz + 2)
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#define encode_symlink_maxsz	(op_encode_hdr_maxsz + \
				1 + nfs4_name_maxsz + \
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				1 + \
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				nfs4_fattr_maxsz)
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#define decode_symlink_maxsz	(op_decode_hdr_maxsz + 8)
#define encode_create_maxsz	(op_encode_hdr_maxsz + \
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				1 + 2 + nfs4_name_maxsz + \
				encode_attrs_maxsz)
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#define decode_create_maxsz	(op_decode_hdr_maxsz + \
				decode_change_info_maxsz + \
				nfs4_fattr_bitmap_maxsz)
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#define encode_statfs_maxsz	(encode_getattr_maxsz)
#define decode_statfs_maxsz	(decode_getattr_maxsz)
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#define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
#define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
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#define encode_getacl_maxsz	(encode_getattr_maxsz)
#define decode_getacl_maxsz	(op_decode_hdr_maxsz + \
				 nfs4_fattr_bitmap_maxsz + 1)
#define encode_setacl_maxsz	(op_encode_hdr_maxsz + \
				 encode_stateid_maxsz + 3)
#define decode_setacl_maxsz	(decode_setattr_maxsz)
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#define encode_fs_locations_maxsz \
				(encode_getattr_maxsz)
#define decode_fs_locations_maxsz \
				(0)
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#if defined(CONFIG_NFS_V4_1)
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#define NFS4_MAX_MACHINE_NAME_LEN (64)

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#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
				encode_verifier_maxsz + \
				1 /* co_ownerid.len */ + \
				XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
				1 /* flags */ + \
				1 /* spa_how */ + \
				0 /* SP4_NONE (for now) */ + \
				1 /* zero implemetation id array */)
#define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
				2 /* eir_clientid */ + \
				1 /* eir_sequenceid */ + \
				1 /* eir_flags */ + \
				1 /* spr_how */ + \
				0 /* SP4_NONE (for now) */ + \
				2 /* eir_server_owner.so_minor_id */ + \
				/* eir_server_owner.so_major_id<> */ \
				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
				/* eir_server_scope<> */ \
				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
				1 /* eir_server_impl_id array length */ + \
				0 /* ignored eir_server_impl_id contents */)
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#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)
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#define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
#define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
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#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)
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#define encode_reclaim_complete_maxsz	(op_encode_hdr_maxsz + 4)
#define decode_reclaim_complete_maxsz	(op_decode_hdr_maxsz + 4)
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#else /* CONFIG_NFS_V4_1 */
#define encode_sequence_maxsz	0
#define decode_sequence_maxsz	0
#endif /* CONFIG_NFS_V4_1 */

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#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 + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_read_maxsz)
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#define NFS4_dec_read_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_read_maxsz)
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#define NFS4_enc_readlink_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_readlink_maxsz)
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#define NFS4_dec_readlink_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_readlink_maxsz)
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#define NFS4_enc_readdir_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_readdir_maxsz)
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#define NFS4_dec_readdir_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_readdir_maxsz)
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#define NFS4_enc_write_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_write_maxsz + \
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				encode_getattr_maxsz)
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#define NFS4_dec_write_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_write_maxsz + \
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				decode_getattr_maxsz)
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#define NFS4_enc_commit_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_commit_maxsz + \
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				encode_getattr_maxsz)
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#define NFS4_dec_commit_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_commit_maxsz + \
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				decode_getattr_maxsz)
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#define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_savefh_maxsz + \
				encode_open_maxsz + \
				encode_getfh_maxsz + \
				encode_getattr_maxsz + \
				encode_restorefh_maxsz + \
				encode_getattr_maxsz)
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#define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_savefh_maxsz + \
				decode_open_maxsz + \
				decode_getfh_maxsz + \
				decode_getattr_maxsz + \
				decode_restorefh_maxsz + \
				decode_getattr_maxsz)
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#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)
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#define NFS4_enc_open_noattr_sz	(compound_encode_hdr_maxsz + \
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					encode_sequence_maxsz + \
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					encode_putfh_maxsz + \
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					encode_open_maxsz + \
					encode_getattr_maxsz)
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#define NFS4_dec_open_noattr_sz	(compound_decode_hdr_maxsz + \
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					decode_sequence_maxsz + \
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					decode_putfh_maxsz + \
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					decode_open_maxsz + \
					decode_getattr_maxsz)
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#define NFS4_enc_open_downgrade_sz \
				(compound_encode_hdr_maxsz + \
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				 encode_sequence_maxsz + \
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				 encode_putfh_maxsz + \
				 encode_open_downgrade_maxsz + \
				 encode_getattr_maxsz)
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#define NFS4_dec_open_downgrade_sz \
				(compound_decode_hdr_maxsz + \
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				 decode_sequence_maxsz + \
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				 decode_putfh_maxsz + \
				 decode_open_downgrade_maxsz + \
				 decode_getattr_maxsz)
#define NFS4_enc_close_sz	(compound_encode_hdr_maxsz + \
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				 encode_sequence_maxsz + \
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				 encode_putfh_maxsz + \
				 encode_close_maxsz + \
				 encode_getattr_maxsz)
#define NFS4_dec_close_sz	(compound_decode_hdr_maxsz + \
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				 decode_sequence_maxsz + \
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				 decode_putfh_maxsz + \
				 decode_close_maxsz + \
				 decode_getattr_maxsz)
#define NFS4_enc_setattr_sz	(compound_encode_hdr_maxsz + \
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				 encode_sequence_maxsz + \
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				 encode_putfh_maxsz + \
				 encode_setattr_maxsz + \
				 encode_getattr_maxsz)
#define NFS4_dec_setattr_sz	(compound_decode_hdr_maxsz + \
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				 decode_sequence_maxsz + \
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				 decode_putfh_maxsz + \
				 decode_setattr_maxsz + \
				 decode_getattr_maxsz)
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#define NFS4_enc_fsinfo_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_fsinfo_maxsz)
#define NFS4_dec_fsinfo_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_fsinfo_maxsz)
#define NFS4_enc_renew_sz	(compound_encode_hdr_maxsz + \
				encode_renew_maxsz)
#define NFS4_dec_renew_sz	(compound_decode_hdr_maxsz + \
				decode_renew_maxsz)
#define NFS4_enc_setclientid_sz	(compound_encode_hdr_maxsz + \
				encode_setclientid_maxsz)
#define NFS4_dec_setclientid_sz	(compound_decode_hdr_maxsz + \
				decode_setclientid_maxsz)
#define NFS4_enc_setclientid_confirm_sz \
				(compound_encode_hdr_maxsz + \
				encode_setclientid_confirm_maxsz + \
				encode_putrootfh_maxsz + \
				encode_fsinfo_maxsz)
#define NFS4_dec_setclientid_confirm_sz \
				(compound_decode_hdr_maxsz + \
				decode_setclientid_confirm_maxsz + \
				decode_putrootfh_maxsz + \
				decode_fsinfo_maxsz)
#define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_lock_maxsz)
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#define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_lock_maxsz)
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#define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_lockt_maxsz)
#define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
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				 decode_sequence_maxsz + \
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				 decode_putfh_maxsz + \
				 decode_lockt_maxsz)
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#define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_locku_maxsz)
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#define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_locku_maxsz)
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#define NFS4_enc_release_lockowner_sz \
				(compound_encode_hdr_maxsz + \
				 encode_lockowner_maxsz)
#define NFS4_dec_release_lockowner_sz \
				(compound_decode_hdr_maxsz + \
				 decode_lockowner_maxsz)
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#define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_access_maxsz + \
				encode_getattr_maxsz)
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#define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_access_maxsz + \
				decode_getattr_maxsz)
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#define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_getattr_maxsz)
#define NFS4_dec_getattr_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_getattr_maxsz)
#define NFS4_enc_lookup_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_lookup_maxsz + \
				encode_getattr_maxsz + \
				encode_getfh_maxsz)
#define NFS4_dec_lookup_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_lookup_maxsz + \
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				decode_getattr_maxsz + \
				decode_getfh_maxsz)
#define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putrootfh_maxsz + \
				encode_getattr_maxsz + \
				encode_getfh_maxsz)
#define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putrootfh_maxsz + \
				decode_getattr_maxsz + \
				decode_getfh_maxsz)
#define NFS4_enc_remove_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_remove_maxsz + \
				encode_getattr_maxsz)
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#define NFS4_dec_remove_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_remove_maxsz + \
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				decode_getattr_maxsz)
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#define NFS4_enc_rename_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_savefh_maxsz + \
				encode_putfh_maxsz + \
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				encode_rename_maxsz + \
				encode_getattr_maxsz + \
				encode_restorefh_maxsz + \
				encode_getattr_maxsz)
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#define NFS4_dec_rename_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_savefh_maxsz + \
				decode_putfh_maxsz + \
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				decode_rename_maxsz + \
				decode_getattr_maxsz + \
				decode_restorefh_maxsz + \
				decode_getattr_maxsz)
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#define NFS4_enc_link_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_savefh_maxsz + \
				encode_putfh_maxsz + \
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				encode_link_maxsz + \
				decode_getattr_maxsz + \
				encode_restorefh_maxsz + \
				decode_getattr_maxsz)
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#define NFS4_dec_link_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_savefh_maxsz + \
				decode_putfh_maxsz + \
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				decode_link_maxsz + \
				decode_getattr_maxsz + \
				decode_restorefh_maxsz + \
				decode_getattr_maxsz)
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#define NFS4_enc_symlink_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_symlink_maxsz + \
				encode_getattr_maxsz + \
				encode_getfh_maxsz)
#define NFS4_dec_symlink_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_symlink_maxsz + \
				decode_getattr_maxsz + \
				decode_getfh_maxsz)
#define NFS4_enc_create_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_savefh_maxsz + \
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				encode_create_maxsz + \
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				encode_getfh_maxsz + \
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				encode_getattr_maxsz + \
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				encode_restorefh_maxsz + \
				encode_getattr_maxsz)
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#define NFS4_dec_create_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_savefh_maxsz + \
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				decode_create_maxsz + \
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				decode_getfh_maxsz + \
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				decode_getattr_maxsz + \
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				decode_restorefh_maxsz + \
				decode_getattr_maxsz)
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#define NFS4_enc_pathconf_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
				encode_getattr_maxsz)
#define NFS4_dec_pathconf_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
				decode_getattr_maxsz)
#define NFS4_enc_statfs_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_statfs_maxsz)
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#define NFS4_dec_statfs_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_statfs_maxsz)
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#define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_getattr_maxsz)
#define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_getattr_maxsz)
#define NFS4_enc_delegreturn_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_delegreturn_maxsz + \
				encode_getattr_maxsz)
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#define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_delegreturn_maxsz + \
				decode_getattr_maxsz)
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#define NFS4_enc_getacl_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_getacl_maxsz)
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#define NFS4_dec_getacl_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_getacl_maxsz)
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#define NFS4_enc_setacl_sz	(compound_encode_hdr_maxsz + \
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				encode_sequence_maxsz + \
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				encode_putfh_maxsz + \
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				encode_setacl_maxsz)
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#define NFS4_dec_setacl_sz	(compound_decode_hdr_maxsz + \
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				decode_sequence_maxsz + \
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				decode_putfh_maxsz + \
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				decode_setacl_maxsz)
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#define NFS4_enc_fs_locations_sz \
				(compound_encode_hdr_maxsz + \
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				 encode_sequence_maxsz + \
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				 encode_putfh_maxsz + \
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				 encode_lookup_maxsz + \
				 encode_fs_locations_maxsz)
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#define NFS4_dec_fs_locations_sz \
				(compound_decode_hdr_maxsz + \
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				 decode_sequence_maxsz + \
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				 decode_putfh_maxsz + \
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				 decode_lookup_maxsz + \
				 decode_fs_locations_maxsz)
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#if defined(CONFIG_NFS_V4_1)
#define NFS4_enc_exchange_id_sz \
				(compound_encode_hdr_maxsz + \
				 encode_exchange_id_maxsz)
#define NFS4_dec_exchange_id_sz \
				(compound_decode_hdr_maxsz + \
				 decode_exchange_id_maxsz)
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#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)
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#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)
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#define NFS4_enc_sequence_sz \
				(compound_decode_hdr_maxsz + \
				 encode_sequence_maxsz)
#define NFS4_dec_sequence_sz \
				(compound_decode_hdr_maxsz + \
				 decode_sequence_maxsz)
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#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)
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#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)
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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);
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#endif /* CONFIG_NFS_V4_1 */
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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,
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};

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

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static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
{
	__be32 *p = xdr_reserve_space(xdr, nbytes);
	BUG_ON(!p);
	return p;
}
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static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
{
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	__be32 *p;
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	p = xdr_reserve_space(xdr, 4 + len);
	BUG_ON(p == NULL);
	xdr_encode_opaque(p, str, len);
}

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static void encode_compound_hdr(struct xdr_stream *xdr,
				struct rpc_rqst *req,
				struct compound_hdr *hdr)
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{
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	__be32 *p;
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	struct rpc_auth *auth = req->rq_cred->cr_auth;
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	/* initialize running count of expected bytes in reply.
	 * NOTE: the replied tag SHOULD be the same is the one sent,
	 * but this is not required as a MUST for the server to do so. */
	hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
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	dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
	BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
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	p = reserve_space(xdr, 4 + hdr->taglen + 8);
	p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);
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	*p++ = cpu_to_be32(hdr->minorversion);
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	hdr->nops_p = p;
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	*p = cpu_to_be32(hdr->nops);
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}

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

static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
{
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	__be32 *p;
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	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
	BUG_ON(p == NULL);
	xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
}

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

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

	/* Sigh */
	if (iap->ia_valid & ATTR_SIZE)
		len += 8;
	if (iap->ia_valid & ATTR_MODE)
		len += 4;
	if (iap->ia_valid & ATTR_UID) {
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		owner_namelen = nfs_map_uid_to_name(server->nfs_client, iap->ia_uid, owner_name, IDMAP_NAMESZ);
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		if (owner_namelen < 0) {
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			dprintk("nfs: couldn't resolve uid %d to string\n",
					iap->ia_uid);
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			/* XXX */
			strcpy(owner_name, "nobody");
			owner_namelen = sizeof("nobody") - 1;
			/* goto out; */
		}
		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
	}
	if (iap->ia_valid & ATTR_GID) {
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		owner_grouplen = nfs_map_gid_to_group(server->nfs_client, iap->ia_gid, owner_group, IDMAP_NAMESZ);
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		if (owner_grouplen < 0) {
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			dprintk("nfs: couldn't resolve gid %d to string\n",
					iap->ia_gid);
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			strcpy(owner_group, "nobody");
			owner_grouplen = sizeof("nobody") - 1;
			/* goto out; */
		}
		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
	}
	if (iap->ia_valid & ATTR_ATIME_SET)
		len += 16;
	else if (iap->ia_valid & ATTR_ATIME)
		len += 4;
	if (iap->ia_valid & ATTR_MTIME_SET)
		len += 16;
	else if (iap->ia_valid & ATTR_MTIME)
		len += 4;
849
	p = reserve_space(xdr, len);
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	/*
	 * We write the bitmap length now, but leave the bitmap and the attribute
	 * buffer length to be backfilled at the end of this routine.
	 */
855
	*p++ = cpu_to_be32(2);
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	q = p;
	p += 3;

	if (iap->ia_valid & ATTR_SIZE) {
		bmval0 |= FATTR4_WORD0_SIZE;
861
		p = xdr_encode_hyper(p, iap->ia_size);
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	}
	if (iap->ia_valid & ATTR_MODE) {
		bmval1 |= FATTR4_WORD1_MODE;
865
		*p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
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	}
	if (iap->ia_valid & ATTR_UID) {
		bmval1 |= FATTR4_WORD1_OWNER;
869
		p = xdr_encode_opaque(p, owner_name, owner_namelen);
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	}
	if (iap->ia_valid & ATTR_GID) {
		bmval1 |= FATTR4_WORD1_OWNER_GROUP;
873
		p = xdr_encode_opaque(p, owner_group, owner_grouplen);
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	}
	if (iap->ia_valid & ATTR_ATIME_SET) {
		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
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		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
		*p++ = cpu_to_be32(0);
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		*p++ = cpu_to_be32(iap->ia_atime.tv_sec);
		*p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
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	}
	else if (iap->ia_valid & ATTR_ATIME) {
		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
884
		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
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	}
	if (iap->ia_valid & ATTR_MTIME_SET) {
		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
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		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
		*p++ = cpu_to_be32(0);
		*p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
		*p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
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	}
	else if (iap->ia_valid & ATTR_MTIME) {
		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
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		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
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	}
897

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	/*
	 * Now we backfill the bitmap and the attribute buffer length.
	 */
	if (len != ((char *)p - (char *)q) + 4) {
902
		printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
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				len, ((char *)p - (char *)q) + 4);
		BUG();
	}
	len = (char *)p - (char *)q - 12;
	*q++ = htonl(bmval0);
	*q++ = htonl(bmval1);
909
	*q = htonl(len);
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/* out: */
}

914
static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
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{
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	__be32 *p;
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918
	p = reserve_space(xdr, 8);
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	*p++ = cpu_to_be32(OP_ACCESS);
920
	*p = cpu_to_be32(access);
921
	hdr->nops++;
922
	hdr->replen += decode_access_maxsz;
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}

925
static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
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{
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	__be32 *p;
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929
	p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
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	*p++ = cpu_to_be32(OP_CLOSE);
	*p++ = cpu_to_be32(arg->seqid->sequence->counter);
932
	xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
933
	hdr->nops++;
934
	hdr->replen += decode_close_maxsz;
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}

937
static void encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
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{
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	__be32 *p;
940

941
	p = reserve_space(xdr, 16);
942
	*p++ = cpu_to_be32(OP_COMMIT);
943
	p = xdr_encode_hyper(p, args->offset);
944
	*p = cpu_to_be32(args->count);
945
	hdr->nops++;
946
	hdr->replen += decode_commit_maxsz;
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}

949
static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
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{
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	__be32 *p;
952

953
	p = reserve_space(xdr, 8);
954
	*p++ = cpu_to_be32(OP_CREATE);
955
	*p = cpu_to_be32(create->ftype);
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	switch (create->ftype) {
	case NF4LNK:
959
		p = reserve_space(xdr, 4);
960
		*p = cpu_to_be32(create->u.symlink.len);
961
		xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
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		break;

	case NF4BLK: case NF4CHR:
965
		p = reserve_space(xdr, 8);
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		*p++ = cpu_to_be32(create->u.device.specdata1);
967
		*p = cpu_to_be32(create->u.device.specdata2);
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		break;

	default:
		break;
	}

974
	encode_string(xdr, create->name->len, create->name->name);
975
	hdr->nops++;
976
	hdr->replen += decode_create_maxsz;
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978
	encode_attrs(xdr, create->attrs, create->server);
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}

981
static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
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{
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	__be32 *p;
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985
	p = reserve_space(xdr, 12);
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	*p++ = cpu_to_be32(OP_GETATTR);
	*p++ = cpu_to_be32(1);
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	*p = cpu_to_be32(bitmap);
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	hdr->nops++;
990
	hdr->replen += decode_getattr_maxsz;
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}

993
static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 16);
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	*p++ = cpu_to_be32(OP_GETATTR);
	*p++ = cpu_to_be32(2);
	*p++ = cpu_to_be32(bm0);
1001
	*p = cpu_to_be32(bm1);
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	hdr->nops++;
1003
	hdr->replen += decode_getattr_maxsz;
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}

1006
static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
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{
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	encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
			   bitmask[1] & nfs4_fattr_bitmap[1], hdr);
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}

1012
static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
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{
1014 1015
	encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],
			   bitmask[1] & nfs4_fsinfo_bitmap[1], hdr);
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}

1018
static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1019
{
1020 1021
	encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
			   bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
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}

1024
static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
1029
	*p = cpu_to_be32(OP_GETFH);
1030
	hdr->nops++;
1031
	hdr->replen += decode_getfh_maxsz;
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}

1034
static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1038
	p = reserve_space(xdr, 8 + name->len);
1039
	*p++ = cpu_to_be32(OP_LINK);
1040
	xdr_encode_opaque(p, name->name, name->len);
1041
	hdr->nops++;
1042
	hdr->replen += decode_link_maxsz;
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}

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

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

1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
{
	__be32 *p;

	p = reserve_space(xdr, 28);
	p = xdr_encode_hyper(p, lowner->clientid);
	*p++ = cpu_to_be32(16);
	p = xdr_encode_opaque_fixed(p, "lock id:", 8);
	xdr_encode_hyper(p, lowner->id);
}

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/*
 * opcode,type,reclaim,offset,length,new_lock_owner = 32
 * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
 */
1074
static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 32);
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	*p++ = cpu_to_be32(OP_LOCK);
	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
	*p++ = cpu_to_be32(args->reclaim);
1082 1083
	p = xdr_encode_hyper(p, args->fl->fl_start);
	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1084
	*p = cpu_to_be32(args->new_lock_owner);
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	if (args->new_lock_owner){
1086
		p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1087
		*p++ = cpu_to_be32(args->open_seqid->sequence->counter);
1088
		p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
1089
		*p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
1090
		encode_lockowner(xdr, &args->lock_owner);
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	}
	else {
1093
		p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
1094
		p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
1095
		*p = cpu_to_be32(args->lock_seqid->sequence->counter);
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	}
1097
	hdr->nops++;
1098
	hdr->replen += decode_lock_maxsz;
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}

1101
static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1105
	p = reserve_space(xdr, 24);
1106 1107
	*p++ = cpu_to_be32(OP_LOCKT);
	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
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	p = xdr_encode_hyper(p, args->fl->fl_start);
	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1110
	encode_lockowner(xdr, &args->lock_owner);
1111
	hdr->nops++;
1112
	hdr->replen += decode_lockt_maxsz;
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}

1115
static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1119
	p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
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	*p++ = cpu_to_be32(OP_LOCKU);
	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
	*p++ = cpu_to_be32(args->seqid->sequence->counter);
1123
	p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
1124
	p = xdr_encode_hyper(p, args->fl->fl_start);
1125
	xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1126
	hdr->nops++;
1127
	hdr->replen += decode_locku_maxsz;
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}

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

	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_RELEASE_LOCKOWNER);
	encode_lockowner(xdr, lowner);
	hdr->nops++;
	hdr->replen += decode_release_lockowner_maxsz;
}

1141
static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
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{
	int len = name->len;
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	__be32 *p;
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1146
	p = reserve_space(xdr, 8 + len);
1147
	*p++ = cpu_to_be32(OP_LOOKUP);
1148
	xdr_encode_opaque(p, name->name, len);
1149
	hdr->nops++;
1150
	hdr->replen += decode_lookup_maxsz;
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}

1153
static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
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{
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	__be32 *p;
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1157
	p = reserve_space(xdr, 8);
1158
	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
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	case FMODE_READ:
1160
		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
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		break;
	case FMODE_WRITE:
1163
		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
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		break;
	case FMODE_READ|FMODE_WRITE:
1166
		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
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		break;
	default:
1169
		*p++ = cpu_to_be32(0);
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	}
1171
	*p = cpu_to_be32(0);		/* for linux, share_deny = 0 always */
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}

static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
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	__be32 *p;
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 /*
 * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
 * owner 4 = 32
 */
1181
	p = reserve_space(xdr, 8);
1182
	*p++ = cpu_to_be32(OP_OPEN);
1183
	*p = cpu_to_be32(arg->seqid->sequence->counter);
1184
	encode_share_access(xdr, arg->fmode);
1185
	p = reserve_space(xdr, 28);
1186
	p = xdr_encode_hyper(p, arg->clientid);
1187
	*p++ = cpu_to_be32(16);
1188
	p = xdr_encode_opaque_fixed(p, "open id:", 8);
1189
	xdr_encode_hyper(p, arg->id);
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}

static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
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	__be32 *p;
1195
	struct nfs_client *clp;
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1197
	p = reserve_space(xdr, 4);
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	switch(arg->open_flags & O_EXCL) {
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	case 0:
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		*p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
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		encode_attrs(xdr, arg->u.attrs, arg->server);
		break;
	default:
1204
		clp = arg->server->nfs_client;
1205
		if (clp->cl_mvops->minor_version > 0) {
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			if (nfs4_has_persistent_session(clp)) {
				*p = cpu_to_be32(NFS4_CREATE_GUARDED);
				encode_attrs(xdr, arg->u.attrs, arg->server);
			} else {
				struct iattr dummy;

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

static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
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	switch (arg->open_flags & O_CREAT) {
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	case 0:
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		*p = cpu_to_be32(NFS4_OPEN_NOCREATE);
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		break;
	default:
		BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
1235
		*p = cpu_to_be32(NFS4_OPEN_CREATE);
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		encode_createmode(xdr, arg);
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	}
}

1240
static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
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	switch (delegation_type) {
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	case 0:
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		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
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		break;
	case FMODE_READ:
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		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
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		break;
	case FMODE_WRITE|FMODE_READ:
1253
		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
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		break;
	default:
		BUG();
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	}
}

static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
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	*p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
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	encode_string(xdr, name->len, name->name);
}

1269
static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
1274
	*p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
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	encode_delegation_type(xdr, type);
}

static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
{
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	__be32 *p;
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	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1283
	*p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1284
	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
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	encode_string(xdr, name->len, name->name);
}

1288
static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
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{
	encode_openhdr(xdr, arg);
	encode_opentype(xdr, arg);
	switch (arg->claim) {
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	case NFS4_OPEN_CLAIM_NULL:
		encode_claim_null(xdr, arg->name);
		break;
	case NFS4_OPEN_CLAIM_PREVIOUS:
		encode_claim_previous(xdr, arg->u.delegation_type);
		break;
	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
		encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
		break;
	default:
		BUG();
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	}
1305
	hdr->nops++;
1306
	hdr->replen += decode_open_maxsz;
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}

1309
static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1314
	*p++ = cpu_to_be32(OP_OPEN_CONFIRM);
1315
	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1316
	*p = cpu_to_be32(arg->seqid->sequence->counter);
1317
	hdr->nops++;
1318
	hdr->replen += decode_open_confirm_maxsz;
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}

1321
static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1326
	*p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
1327
	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1328
	*p = cpu_to_be32(arg->seqid->sequence->counter);
1329
	encode_share_access(xdr, arg->fmode);
1330
	hdr->nops++;
1331
	hdr->replen += decode_open_downgrade_maxsz;
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}

1334
static void
1335
encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
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{
	int len = fh->size;
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	__be32 *p;
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1340
	p = reserve_space(xdr, 8 + len);
1341
	*p++ = cpu_to_be32(OP_PUTFH);
1342
	xdr_encode_opaque(p, fh->data, len);
1343
	hdr->nops++;
1344
	hdr->replen += decode_putfh_maxsz;
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}

1347
static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
1352
	*p = cpu_to_be32(OP_PUTROOTFH);
1353
	hdr->nops++;
1354
	hdr->replen += decode_putrootfh_maxsz;
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}

1357
static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx, const struct nfs_lock_context *l_ctx)
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{
	nfs4_stateid stateid;
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	__be32 *p;
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	p = reserve_space(xdr, NFS4_STATEID_SIZE);
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	if (ctx->state != NULL) {
1364
		nfs4_copy_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
1365
		xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
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	} else
1367
		xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
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}

1370
static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
1375
	*p = cpu_to_be32(OP_READ);
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1377
	encode_stateid(xdr, args->context, args->lock_context);
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	p = reserve_space(xdr, 12);
1380
	p = xdr_encode_hyper(p, args->offset);
1381
	*p = cpu_to_be32(args->count);
1382
	hdr->nops++;
1383
	hdr->replen += decode_read_maxsz;
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}

1386
static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
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{
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	uint32_t attrs[2] = {0, 0};
1389
	uint32_t dircount = readdir->count >> 1;
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	__be32 *p;
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	if (readdir->plus) {
		attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
			FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE;
		attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
			FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
			FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
			FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1399
		dircount >>= 1;
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	}
	attrs[0] |= FATTR4_WORD0_RDATTR_ERROR|FATTR4_WORD0_FILEID;
	attrs[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
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	/* Switch to mounted_on_fileid if the server supports it */
	if (readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
		attrs[0] &= ~FATTR4_WORD0_FILEID;
	else
		attrs[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
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1409
	p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
1410
	*p++ = cpu_to_be32(OP_READDIR);
1411
	p = xdr_encode_hyper(p, readdir->cookie);
1412
	p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
1413
	*p++ = cpu_to_be32(dircount);
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	*p++ = cpu_to_be32(readdir->count);
	*p++ = cpu_to_be32(2);
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1417
	*p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
1418
	*p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
1419
	hdr->nops++;
1420
	hdr->replen += decode_readdir_maxsz;
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	dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
			__func__,
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			(unsigned long long)readdir->cookie,
			((u32 *)readdir->verifier.data)[0],
			((u32 *)readdir->verifier.data)[1],
			attrs[0] & readdir->bitmask[0],
			attrs[1] & readdir->bitmask[1]);
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}

1430
static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1434
	p = reserve_space(xdr, 4);
1435
	*p = cpu_to_be32(OP_READLINK);
1436
	hdr->nops++;
1437
	hdr->replen += decode_readlink_maxsz;
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}

1440
static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1444
	p = reserve_space(xdr, 8 + name->len);
1445
	*p++ = cpu_to_be32(OP_REMOVE);
1446
	xdr_encode_opaque(p, name->name, name->len);
1447
	hdr->nops++;
1448
	hdr->replen += decode_remove_maxsz;
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}

1451
static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
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{
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	__be32 *p;
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	p = reserve_space(xdr, 4);
	*p = cpu_to_be32(OP_RENAME);
	encode_string(xdr, oldname->len, oldname->name);
	encode_string(xdr, newname->len, newname->name);
1459
	hdr->nops++;
1460
	hdr->replen += decode_rename_maxsz;
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}

1463
static void encode_renew(struct xdr_stream *xdr, const struct nfs_client *client_stateid, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1467
	p = reserve_space(xdr, 12);
1468
	*p++ = cpu_to_be32(OP_RENEW);
1469
	xdr_encode_hyper(p, client_stateid->cl_clientid);
1470
	hdr->nops++;
1471
	hdr->replen += decode_renew_maxsz;
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}

1474
static void
1475
encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1476
{
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	__be32 *p;
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1479
	p = reserve_space(xdr, 4);
1480
	*p = cpu_to_be32(OP_RESTOREFH);
1481
	hdr->nops++;
1482
	hdr->replen += decode_restorefh_maxsz;
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}

1485
static int
1486
encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1487
{
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	__be32 *p;
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1490
	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1491
	*p++ = cpu_to_be32(OP_SETATTR);
1492
	xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1493
	p = reserve_space(xdr, 2*4);
1494
	*p++ = cpu_to_be32(1);
1495
	*p = cpu_to_be32(FATTR4_WORD0_ACL);
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	if (arg->acl_len % 4)
		return -EINVAL;
1498
	p = reserve_space(xdr, 4);
1499
	*p = cpu_to_be32(arg->acl_len);
1500
	xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1501
	hdr->nops++;
1502
	hdr->replen += decode_setacl_maxsz;
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	return 0;
}

1506
static void
1507
encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1511
	p = reserve_space(xdr, 4);
1512
	*p = cpu_to_be32(OP_SAVEFH);
1513
	hdr->nops++;
1514
	hdr->replen += decode_savefh_maxsz;
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}

1517
static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
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{
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	__be32 *p;
1520

1521
	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1522
	*p++ = cpu_to_be32(OP_SETATTR);
1523
	xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
1524
	hdr->nops++;
1525
	hdr->replen += decode_setattr_maxsz;
1526
	encode_attrs(xdr, arg->iap, server);
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}

1529
static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1533
	p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
1534
	*p++ = cpu_to_be32(OP_SETCLIENTID);
1535
	xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);
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	encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1538
	p = reserve_space(xdr, 4);
1539
	*p = cpu_to_be32(setclientid->sc_prog);
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	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1542
	p = reserve_space(xdr, 4);
1543
	*p = cpu_to_be32(setclientid->sc_cb_ident);
1544
	hdr->nops++;
1545
	hdr->replen += decode_setclientid_maxsz;
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}

1548
static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1552
	p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
1553
	*p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
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	p = xdr_encode_hyper(p, arg->clientid);
	xdr_encode_opaque_fixed(p, arg->confirm.data, NFS4_VERIFIER_SIZE);
1556
	hdr->nops++;
1557
	hdr->replen += decode_setclientid_confirm_maxsz;
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}

1560
static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1564
	p = reserve_space(xdr, 4);
1565
	*p = cpu_to_be32(OP_WRITE);
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1567
	encode_stateid(xdr, args->context, args->lock_context);
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	p = reserve_space(xdr, 16);
1570
	p = xdr_encode_hyper(p, args->offset);
1571
	*p++ = cpu_to_be32(args->stable);
1572
	*p = cpu_to_be32(args->count);
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	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1575
	hdr->nops++;
1576
	hdr->replen += decode_write_maxsz;
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}

1579
static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
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{
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	__be32 *p;
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1583
	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
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1585
	*p++ = cpu_to_be32(OP_DELEGRETURN);
1586
	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1587
	hdr->nops++;
1588
	hdr->replen += decode_delegreturn_maxsz;
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}
1590

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

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

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	p = reserve_space(xdr, 12);
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	*p++ = cpu_to_be32(args->flags);
	*p++ = cpu_to_be32(0);	/* zero length state_protect4_a */
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	*p = cpu_to_be32(0);	/* zero length implementation id array */
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	hdr->nops++;
	hdr->replen += decode_exchange_id_maxsz;
}
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static void encode_create_session(struct xdr_stream *xdr,
				  struct nfs41_create_session_args *args,
				  struct compound_hdr *hdr)
{
	__be32 *p;
	char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
	uint32_t len;
	struct nfs_client *clp = args->client;
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	u32 max_resp_sz_cached;

	/*
	 * Assumes OPEN is the biggest non-idempotent compound.
	 * 2 is the verifier.
	 */
	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
			      RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
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	len = scnprintf(machine_name, sizeof(machine_name), "%s",
			clp->cl_ipaddr);
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	p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
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	*p++ = cpu_to_be32(OP_CREATE_SESSION);
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	p = xdr_encode_hyper(p, clp->cl_ex_clid);
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	*p++ = cpu_to_be32(clp->cl_seqid);			/*Sequence id */
	*p++ = cpu_to_be32(args->flags);			/*flags */
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	/* Fore Channel */
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	*p++ = cpu_to_be32(args->fc_attrs.headerpadsz);	/* header padding size */
	*p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz);	/* max req size */
	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz);	/* max resp size */
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	*p++ = cpu_to_be32(max_resp_sz_cached);		/* Max resp sz cached */
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	*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 */
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	/* Back Channel */
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	*p++ = cpu_to_be32(args->fc_attrs.headerpadsz);	/* header padding size */
	*p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz);	/* max req size */
	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz);	/* max resp size */
	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
	*p++ = cpu_to_be32(args->bc_attrs.max_ops);	/* max operations */
	*p++ = cpu_to_be32(args->bc_attrs.max_reqs);	/* max requests */
	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
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	*p++ = cpu_to_be32(args->cb_program);		/* cb_program */
	*p++ = cpu_to_be32(1);
	*p++ = cpu_to_be32(RPC_AUTH_UNIX);			/* auth_sys */
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	/* authsys_parms rfc1831 */
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	*p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);	/* stamp */
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	p = xdr_encode_opaque(p, machine_name, len);
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	*p++ = cpu_to_be32(0);				/* UID */
	*p++ = cpu_to_be32(0);				/* GID */
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	*p = cpu_to_be32(0);				/* No more gids */
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	hdr->nops++;
	hdr->replen += decode_create_session_maxsz;
}
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static void encode_destroy_session(struct xdr_stream *xdr,
				   struct nfs4_session *session,
				   struct compound_hdr *hdr)
{
	__be32 *p;
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	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
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	*p++ = cpu_to_be32(OP_DESTROY_SESSION);
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	xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
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	hdr->nops++;
	hdr->replen += decode_destroy_session_maxsz;
}
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static void encode_reclaim_complete(struct xdr_stream *xdr,
				    struct nfs41_reclaim_complete_args *args,
				    struct compound_hdr *hdr)
{
	__be32 *p;

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

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

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	tp = &session->fc_slot_table;

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

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	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
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	*p++ = cpu_to_be32(OP_SEQUENCE);
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	/*
	 * Sessionid + seqid + slotid + max slotid + cache_this
	 */
	dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
		"max_slotid=%d cache_this=%d\n",
		__func__,
		((u32 *)session->sess_id.data)[0],
		((u32 *)session->sess_id.data)[1],
		((u32 *)session->sess_id.data)[2],
		((u32 *)session->sess_id.data)[3],
		slot->seq_nr, args->sa_slotid,
		tp->highest_used_slotid, args->sa_cache_this);
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	p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
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	*p++ = cpu_to_be32(slot->seq_nr);
	*p++ = cpu_to_be32(args->sa_slotid);
	*p++ = cpu_to_be32(tp->highest_used_slotid);
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	*p = cpu_to_be32(args->sa_cache_this);
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	hdr->nops++;
	hdr->replen += decode_sequence_maxsz;
#endif /* CONFIG_NFS_V4_1 */
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/*
 * Encode a LOCK request
 */
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static int nfs4_xdr_enc_lock(struct rpc_rqst *req, __be32 *p, struct nfs_lock_args *args)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
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		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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	};

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->fh, &hdr);
	encode_lock(&xdr, args, &hdr);
2050
	encode_nops(&hdr);
2051
	return 0;
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}

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->fh, &hdr);
	encode_lockt(&xdr, args, &hdr);
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	encode_nops(&hdr);
2070
	return 0;
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}

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

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

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static int nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req, __be32 *p, struct nfs_release_lockowner_args *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.minorversion = 0,
	};

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

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->fh, &hdr);
	encode_readlink(&xdr, args, req, &hdr);
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2122
	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2123
			args->pgbase, args->pglen);
2124
	encode_nops(&hdr);
2125
	return 0;
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}

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

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

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->fh, &hdr);
	encode_read(&xdr, args, &hdr);
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	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
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			 args->pages, args->pgbase, args->count);
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	req->rq_rcv_buf.flags |= XDRBUF_READ;
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	encode_nops(&hdr);
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	return 0;
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}

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

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

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/*
 * Encode a GETACL request
 */
static int
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nfs4_xdr_enc_getacl(struct rpc_rqst *req, __be32 *p,
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		struct nfs_getaclargs *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
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		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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	};
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	uint32_t replen;
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	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->fh, &hdr);
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	replen = hdr.replen + op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz + 1;
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	encode_getattr_two(&xdr, FATTR4_WORD0_ACL, 0, &hdr);

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

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

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

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

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

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

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

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

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

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->fh, &hdr);
	encode_getattr_two(&xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
			   args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
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	encode_nops(&hdr);
2319
	return 0;
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}

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

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

/*
 * a RENEW request
 */
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static int nfs4_xdr_enc_renew(struct rpc_rqst *req, __be32 *p, struct nfs_client *clp)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
2352
		.nops	= 0,
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	};

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

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
2374
	encode_setclientid(&xdr, sc, &hdr);
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	encode_nops(&hdr);
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	return 0;
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}

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

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

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

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

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/*
 * Encode FS_LOCATIONS request
 */
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static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, __be32 *p, struct nfs4_fs_locations_arg *args)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
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		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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	};
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	uint32_t replen;
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	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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	encode_compound_hdr(&xdr, req, &hdr);
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	encode_sequence(&xdr, &args->seq_args, &hdr);
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	encode_putfh(&xdr, args->dir_fh, &hdr);
	encode_lookup(&xdr, args->name, &hdr);
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	replen = hdr.replen;	/* get the attribute into args->page */
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	encode_fs_locations(&xdr, args->bitmask, &hdr);

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	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
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			0, PAGE_SIZE);
2440
	encode_nops(&hdr);
2441
	return 0;
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}

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, req, &hdr);
	encode_exchange_id(&xdr, args, &hdr);
	encode_nops(&hdr);
	return 0;
}
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/*
 * a CREATE_SESSION request
 */
static int nfs4_xdr_enc_create_session(struct rpc_rqst *req, uint32_t *p,
				       struct nfs41_create_session_args *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
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		.minorversion = args->client->cl_mvops->minor_version,
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	};

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

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

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

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

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

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

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
	encode_compound_hdr(&xdr, req, &hdr);
	encode_sequence(&xdr, &args->la_seq_args, &hdr);
	encode_putrootfh(&xdr, &hdr);
	encode_fsinfo(&xdr, lease_bitmap, &hdr);
	encode_nops(&hdr);
	return 0;
}
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/*
 * a RECLAIM_COMPLETE request
 */
static int nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req, uint32_t *p,
				     struct nfs41_reclaim_complete_args *args)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args)
	};

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

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#endif /* CONFIG_NFS_V4_1 */

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static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
	dprintk("nfs: %s: prematurely hit end of receive buffer. "
		"Remaining buffer length is %tu words.\n",
		func, xdr->end - xdr->p);
}
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2566
static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
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{
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	__be32 *p;
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2570 2571 2572
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
2573
	*len = be32_to_cpup(p);
2574 2575 2576
	p = xdr_inline_decode(xdr, *len);
	if (unlikely(!p))
		goto out_overflow;
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	*string = (char *)p;
	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
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	__be32 *p;
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	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
2591
	hdr->status = be32_to_cpup(p++);
2592
	hdr->taglen = be32_to_cpup(p);
2593

2594 2595 2596
	p = xdr_inline_decode(xdr, hdr->taglen + 4);
	if (unlikely(!p))
		goto out_overflow;
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	hdr->tag = (char *)p;
	p += XDR_QUADLEN(hdr->taglen);
2599
	hdr->nops = be32_to_cpup(p);
2600 2601
	if (unlikely(hdr->nops < 1))
		return nfs4_stat_to_errno(hdr->status);
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	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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

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	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
2617
	opnum = be32_to_cpup(p++);
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	if (opnum != expected) {
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		dprintk("nfs: Server returned operation"
			" %d but we issued a request for %d\n",
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				opnum, expected);
		return -EIO;
	}
2624
	nfserr = be32_to_cpup(p);
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	if (nfserr != NFS_OK)
2626
		return nfs4_stat_to_errno(nfserr);
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	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

/* Dummy routine */
2634
static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
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{
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	__be32 *p;
2637
	unsigned int strlen;
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	char *str;

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

static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
{
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	uint32_t bmlen;
	__be32 *p;
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2652 2653 2654
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
2655
	bmlen = be32_to_cpup(p);
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	bitmap[0] = bitmap[1] = 0;
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	p = xdr_inline_decode(xdr, (bmlen << 2));
	if (unlikely(!p))
		goto out_overflow;
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	if (bmlen > 0) {
2662
		bitmap[0] = be32_to_cpup(p++);
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		if (bmlen > 1)
2664
			bitmap[1] = be32_to_cpup(p);
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	}
	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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2672
static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, __be32 **savep)
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{
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	__be32 *p;
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	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
2679
	*attrlen = be32_to_cpup(p);
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	*savep = xdr->p;
	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
{
	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
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		int ret;
		ret = decode_attr_bitmap(xdr, bitmask);
		if (unlikely(ret < 0))
			return ret;
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		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
	} else
		bitmask[0] = bitmask[1] = 0;
2697
	dprintk("%s: bitmask=%08x:%08x\n", __func__, bitmask[0], bitmask[1]);
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	return 0;
}

static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
{
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	__be32 *p;
2704
	int ret = 0;
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	*type = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
2710 2711 2712
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
2713
		*type = be32_to_cpup(p);
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		if (*type < NF4REG || *type > NF4NAMEDATTR) {
2715
			dprintk("%s: bad type %d\n", __func__, *type);
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			return -EIO;
		}
		bitmap[0] &= ~FATTR4_WORD0_TYPE;
2719
		ret = NFS_ATTR_FATTR_TYPE;
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2720
	}
2721
	dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
2722
	return ret;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
{
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	__be32 *p;
2731
	int ret = 0;
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	*change = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
2737 2738 2739
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
2740
		xdr_decode_hyper(p, change);
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		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
2742
		ret = NFS_ATTR_FATTR_CHANGE;
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2743
	}
2744
	dprintk("%s: change attribute=%Lu\n", __func__,
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2745
			(unsigned long long)*change);
2746
	return ret;
2747 2748 2749
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
{
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	__be32 *p;
2755
	int ret = 0;
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	*size = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
2761 2762 2763
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
2764
		xdr_decode_hyper(p, size);
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		bitmap[0] &= ~FATTR4_WORD0_SIZE;
2766
		ret = NFS_ATTR_FATTR_SIZE;
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	}
2768
	dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
2769
	return ret;
2770 2771 2772
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
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	__be32 *p;
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	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
2783 2784 2785
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
2786
		*res = be32_to_cpup(p);
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		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
	}
2789
	dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
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	return 0;
2791 2792 2793
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
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	__be32 *p;
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	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
2804 2805 2806
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
2807
		*res = be32_to_cpup(p);
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		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
	}
2810
	dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
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	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

2817
static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
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{
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2819
	__be32 *p;
2820
	int ret = 0;
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	fsid->major = 0;
	fsid->minor = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
2827 2828 2829
		p = xdr_inline_decode(xdr, 16);
		if (unlikely(!p))
			goto out_overflow;
2830
		p = xdr_decode_hyper(p, &fsid->major);
2831
		xdr_decode_hyper(p, &fsid->minor);
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		bitmap[0] &= ~FATTR4_WORD0_FSID;
2833
		ret = NFS_ATTR_FATTR_FSID;
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2834
	}
2835
	dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
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			(unsigned long long)fsid->major,
			(unsigned long long)fsid->minor);
2838
	return ret;
2839 2840 2841
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
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	__be32 *p;
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	*res = 60;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
2852 2853 2854
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
2855
		*res = be32_to_cpup(p);
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		bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
	}
2858
	dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
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2859
	return 0;
2860 2861 2862
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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

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

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

2888 2889
	if (fh != NULL)
		memset(fh, 0, sizeof(*fh));
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	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
		len = be32_to_cpup(p);
		if (len > NFS4_FHSIZE)
			return -EIO;
		p = xdr_inline_decode(xdr, len);
		if (unlikely(!p))
			goto out_overflow;
2903 2904 2905 2906
		if (fh != NULL) {
			memcpy(fh->data, p, len);
			fh->size = len;
		}
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		bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
	}
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

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static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
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	__be32 *p;
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	*res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
2923 2924 2925
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
2926
		*res = be32_to_cpup(p);
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		bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
	}
2929
	dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
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	return 0;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
{
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	__be32 *p;
2939
	int ret = 0;
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	*fileid = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
2945 2946 2947
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
2948
		xdr_decode_hyper(p, fileid);
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		bitmap[0] &= ~FATTR4_WORD0_FILEID;
2950
		ret = NFS_ATTR_FATTR_FILEID;
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	}
2952
	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
2953
	return ret;
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out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

2959 2960
static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
{
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	__be32 *p;
2962
	int ret = 0;
2963 2964 2965 2966 2967

	*fileid = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
2968 2969 2970
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
2971
		xdr_decode_hyper(p, fileid);
2972
		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
2973
		ret = NFS_ATTR_FATTR_FILEID;
2974
	}
2975
	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
2976
	return ret;
2977 2978 2979
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
2980 2981
}

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2982 2983
static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
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2984
	__be32 *p;
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2985 2986 2987 2988 2989 2990
	int status = 0;

	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
2991 2992 2993
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
2994
		xdr_decode_hyper(p, res);
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Linus Torvalds committed
2995 2996
		bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
	}
2997
	dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
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2998
	return status;
2999 3000 3001
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3002 3003 3004 3005
}

static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
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3006
	__be32 *p;
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3007 3008 3009 3010 3011 3012
	int status = 0;

	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3013 3014 3015
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3016
		xdr_decode_hyper(p, res);
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3017 3018
		bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
	}
3019
	dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
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3020
	return status;
3021 3022 3023
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3024 3025 3026 3027
}

static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
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3028
	__be32 *p;
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3029 3030 3031 3032 3033 3034
	int status = 0;

	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3035 3036 3037
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3038
		xdr_decode_hyper(p, res);
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Linus Torvalds committed
3039 3040
		bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
	}
3041
	dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
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3042
	return status;
3043 3044 3045
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3046 3047
}

3048 3049
static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
{
3050
	u32 n;
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3051
	__be32 *p;
3052 3053
	int status = 0;

3054 3055 3056
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
3057
	n = be32_to_cpup(p);
3058 3059
	if (n == 0)
		goto root_path;
3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079
	dprintk("path ");
	path->ncomponents = 0;
	while (path->ncomponents < n) {
		struct nfs4_string *component = &path->components[path->ncomponents];
		status = decode_opaque_inline(xdr, &component->len, &component->data);
		if (unlikely(status != 0))
			goto out_eio;
		if (path->ncomponents != n)
			dprintk("/");
		dprintk("%s", component->data);
		if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
			path->ncomponents++;
		else {
			dprintk("cannot parse %d components in path\n", n);
			goto out_eio;
		}
	}
out:
	dprintk("\n");
	return status;
3080 3081 3082 3083 3084 3085 3086
root_path:
/* a root pathname is sent as a zero component4 */
	path->ncomponents = 1;
	path->components[0].len=0;
	path->components[0].data=NULL;
	dprintk("path /\n");
	goto out;
3087 3088 3089 3090
out_eio:
	dprintk(" status %d", status);
	status = -EIO;
	goto out;
3091 3092 3093
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
3094 3095 3096
}

static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3097 3098
{
	int n;
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3099
	__be32 *p;
3100 3101 3102 3103 3104 3105 3106
	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;
3107
	dprintk("%s: fsroot ", __func__);
3108
	status = decode_pathname(xdr, &res->fs_path);
3109 3110
	if (unlikely(status != 0))
		goto out;
3111 3112 3113
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
3114
	n = be32_to_cpup(p);
3115 3116 3117 3118
	if (n <= 0)
		goto out_eio;
	res->nlocations = 0;
	while (res->nlocations < n) {
3119
		u32 m;
3120
		struct nfs4_fs_location *loc = &res->locations[res->nlocations];
3121

3122 3123 3124
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3125
		m = be32_to_cpup(p);
3126 3127

		loc->nservers = 0;
3128
		dprintk("%s: servers ", __func__);
3129 3130 3131 3132 3133 3134 3135 3136 3137
		while (loc->nservers < m) {
			struct nfs4_string *server = &loc->servers[loc->nservers];
			status = decode_opaque_inline(xdr, &server->len, &server->data);
			if (unlikely(status != 0))
				goto out_eio;
			dprintk("%s ", server->data);
			if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
				loc->nservers++;
			else {
3138 3139 3140
				unsigned int i;
				dprintk("%s: using first %u of %u servers "
					"returned for location %u\n",
3141
						__func__,
3142 3143
						NFS4_FS_LOCATION_MAXSERVERS,
						m, res->nlocations);
3144
				for (i = loc->nservers; i < m; i++) {
3145
					unsigned int len;
3146 3147 3148 3149 3150 3151 3152 3153
					char *data;
					status = decode_opaque_inline(xdr, &len, &data);
					if (unlikely(status != 0))
						goto out_eio;
				}
			}
		}
		status = decode_pathname(xdr, &loc->rootpath);
3154 3155
		if (unlikely(status != 0))
			goto out_eio;
3156
		if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
3157 3158
			res->nlocations++;
	}
3159 3160
	if (res->nlocations != 0)
		status = NFS_ATTR_FATTR_V4_REFERRAL;
3161
out:
3162
	dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3163
	return status;
3164 3165
out_overflow:
	print_overflow_msg(__func__, xdr);
3166 3167 3168 3169 3170
out_eio:
	status = -EIO;
	goto out;
}

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3171 3172
static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
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3173
	__be32 *p;
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3174 3175 3176 3177 3178 3179
	int status = 0;

	*res = 0;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3180 3181 3182
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3183
		xdr_decode_hyper(p, res);
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3184 3185
		bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
	}
3186
	dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
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3187
	return status;
3188 3189 3190
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3191 3192 3193 3194
}

static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
{
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3195
	__be32 *p;
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3196 3197 3198 3199 3200 3201
	int status = 0;

	*maxlink = 1;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3202 3203 3204
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3205
		*maxlink = be32_to_cpup(p);
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3206 3207
		bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
	}
3208
	dprintk("%s: maxlink=%u\n", __func__, *maxlink);
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3209
	return status;
3210 3211 3212
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3213 3214 3215 3216
}

static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
{
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3217
	__be32 *p;
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3218 3219 3220 3221 3222 3223
	int status = 0;

	*maxname = 1024;
	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3224 3225 3226
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3227
		*maxname = be32_to_cpup(p);
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3228 3229
		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
	}
3230
	dprintk("%s: maxname=%u\n", __func__, *maxname);
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3231
	return status;
3232 3233 3234
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3235 3236 3237 3238
}

static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
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3239
	__be32 *p;
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3240 3241 3242 3243 3244 3245 3246
	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;
3247 3248 3249
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3250
		xdr_decode_hyper(p, &maxread);
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3251 3252 3253 3254 3255
		if (maxread > 0x7FFFFFFF)
			maxread = 0x7FFFFFFF;
		*res = (uint32_t)maxread;
		bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
	}
3256
	dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
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3257
	return status;
3258 3259 3260
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3261 3262 3263 3264
}

static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
{
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3265
	__be32 *p;
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3266 3267 3268 3269 3270 3271 3272
	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;
3273 3274 3275
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3276
		xdr_decode_hyper(p, &maxwrite);
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3277 3278 3279 3280 3281
		if (maxwrite > 0x7FFFFFFF)
			maxwrite = 0x7FFFFFFF;
		*res = (uint32_t)maxwrite;
		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
	}
3282
	dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
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3283
	return status;
3284 3285 3286
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3287 3288
}

3289
static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
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3290
{
3291
	uint32_t tmp;
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3292
	__be32 *p;
3293
	int ret = 0;
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3294 3295 3296 3297 3298

	*mode = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3299 3300 3301
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3302
		tmp = be32_to_cpup(p);
3303
		*mode = tmp & ~S_IFMT;
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3304
		bitmap[1] &= ~FATTR4_WORD1_MODE;
3305
		ret = NFS_ATTR_FATTR_MODE;
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3306
	}
3307
	dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3308
	return ret;
3309 3310 3311
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3312 3313 3314 3315
}

static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
{
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3316
	__be32 *p;
3317
	int ret = 0;
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3318 3319 3320 3321 3322

	*nlink = 1;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3323 3324 3325
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3326
		*nlink = be32_to_cpup(p);
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3327
		bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3328
		ret = NFS_ATTR_FATTR_NLINK;
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Linus Torvalds committed
3329
	}
3330
	dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3331
	return ret;
3332 3333 3334
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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Linus Torvalds committed
3335 3336
}

3337 3338
static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
		struct nfs_client *clp, uint32_t *uid, int may_sleep)
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3339
{
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3340 3341
	uint32_t len;
	__be32 *p;
3342
	int ret = 0;
Linus Torvalds's avatar
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3343 3344 3345 3346 3347

	*uid = -2;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3348 3349 3350
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3351
		len = be32_to_cpup(p);
3352 3353 3354
		p = xdr_inline_decode(xdr, len);
		if (unlikely(!p))
			goto out_overflow;
3355 3356 3357
		if (!may_sleep) {
			/* do nothing */
		} else if (len < XDR_MAX_NETOBJ) {
3358 3359 3360
			if (nfs_map_name_to_uid(clp, (char *)p, len, uid) == 0)
				ret = NFS_ATTR_FATTR_OWNER;
			else
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3361
				dprintk("%s: nfs_map_name_to_uid failed!\n",
3362
						__func__);
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3363
		} else
3364
			dprintk("%s: name too long (%u)!\n",
3365
					__func__, len);
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3366 3367
		bitmap[1] &= ~FATTR4_WORD1_OWNER;
	}
3368
	dprintk("%s: uid=%d\n", __func__, (int)*uid);
3369
	return ret;
3370 3371 3372
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3373 3374
}

3375 3376
static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
		struct nfs_client *clp, uint32_t *gid, int may_sleep)
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3377
{
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3378 3379
	uint32_t len;
	__be32 *p;
3380
	int ret = 0;
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3381 3382 3383 3384 3385

	*gid = -2;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3386 3387 3388
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
3389
		len = be32_to_cpup(p);
3390 3391 3392
		p = xdr_inline_decode(xdr, len);
		if (unlikely(!p))
			goto out_overflow;
3393 3394 3395
		if (!may_sleep) {
			/* do nothing */
		} else if (len < XDR_MAX_NETOBJ) {
3396 3397 3398
			if (nfs_map_group_to_gid(clp, (char *)p, len, gid) == 0)
				ret = NFS_ATTR_FATTR_GROUP;
			else
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3399
				dprintk("%s: nfs_map_group_to_gid failed!\n",
3400
						__func__);
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3401
		} else
3402
			dprintk("%s: name too long (%u)!\n",
3403
					__func__, len);
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3404 3405
		bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
	}
3406
	dprintk("%s: gid=%d\n", __func__, (int)*gid);
3407
	return ret;
3408 3409 3410
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3411 3412 3413 3414
}

static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
{
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3415 3416
	uint32_t major = 0, minor = 0;
	__be32 *p;
3417
	int ret = 0;
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3418 3419 3420 3421 3422 3423 3424

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

3425 3426 3427
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3428
		major = be32_to_cpup(p++);
3429
		minor = be32_to_cpup(p);
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		tmp = MKDEV(major, minor);
		if (MAJOR(tmp) == major && MINOR(tmp) == minor)
			*rdev = tmp;
		bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3434
		ret = NFS_ATTR_FATTR_RDEV;
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3435
	}
3436
	dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3437
	return ret;
3438 3439 3440
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
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3445
	__be32 *p;
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	int status = 0;

	*res = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3452 3453 3454
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3455
		xdr_decode_hyper(p, res);
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3456 3457
		bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
	}
3458
	dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
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3459
	return status;
3460 3461 3462
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
{
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3467
	__be32 *p;
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	int status = 0;

	*res = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3474 3475 3476
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3477
		xdr_decode_hyper(p, res);
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3478 3479
		bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
	}
3480
	dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
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3481
	return status;
3482 3483 3484
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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

	*res = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3496 3497 3498
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3499
		xdr_decode_hyper(p, res);
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		bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
	}
3502
	dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
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3503
	return status;
3504 3505 3506
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
{
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3511
	__be32 *p;
3512
	int ret = 0;
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	*used = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
3518 3519 3520
		p = xdr_inline_decode(xdr, 8);
		if (unlikely(!p))
			goto out_overflow;
3521
		xdr_decode_hyper(p, used);
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3522
		bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
3523
		ret = NFS_ATTR_FATTR_SPACE_USED;
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3524
	}
3525
	dprintk("%s: space used=%Lu\n", __func__,
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3526
			(unsigned long long)*used);
3527
	return ret;
3528 3529 3530
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3531 3532 3533 3534
}

static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
{
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3535
	__be32 *p;
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	uint64_t sec;
	uint32_t nsec;

3539 3540 3541
	p = xdr_inline_decode(xdr, 12);
	if (unlikely(!p))
		goto out_overflow;
3542
	p = xdr_decode_hyper(p, &sec);
3543
	nsec = be32_to_cpup(p);
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3544 3545 3546
	time->tv_sec = (time_t)sec;
	time->tv_nsec = (long)nsec;
	return 0;
3547 3548 3549
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561
}

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

	time->tv_sec = 0;
	time->tv_nsec = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
		status = decode_attr_time(xdr, time);
3562 3563
		if (status == 0)
			status = NFS_ATTR_FATTR_ATIME;
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3564 3565
		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
	}
3566
	dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
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	return status;
}

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

	time->tv_sec = 0;
	time->tv_nsec = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
		status = decode_attr_time(xdr, time);
3580 3581
		if (status == 0)
			status = NFS_ATTR_FATTR_CTIME;
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3582 3583
		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
	}
3584
	dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
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	return status;
}

3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605
static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
				  struct timespec *time)
{
	int status = 0;

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

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3606 3607 3608 3609 3610 3611 3612 3613 3614 3615
static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
{
	int status = 0;

	time->tv_sec = 0;
	time->tv_nsec = 0;
	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
		return -EIO;
	if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
		status = decode_attr_time(xdr, time);
3616 3617
		if (status == 0)
			status = NFS_ATTR_FATTR_MTIME;
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3618 3619
		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
	}
3620
	dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
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	return status;
}

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3624
static int verify_attr_len(struct xdr_stream *xdr, __be32 *savep, uint32_t attrlen)
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{
	unsigned int attrwords = XDR_QUADLEN(attrlen);
	unsigned int nwords = xdr->p - savep;

	if (unlikely(attrwords != nwords)) {
3630 3631
		dprintk("%s: server returned incorrect attribute length: "
			"%u %c %u\n",
3632
				__func__,
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3633 3634 3635 3636 3637 3638 3639 3640 3641 3642
				attrwords << 2,
				(attrwords < nwords) ? '<' : '>',
				nwords << 2);
		return -EIO;
	}
	return 0;
}

static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
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3643
	__be32 *p;
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3644

3645 3646 3647
	p = xdr_inline_decode(xdr, 20);
	if (unlikely(!p))
		goto out_overflow;
3648
	cinfo->atomic = be32_to_cpup(p++);
3649
	p = xdr_decode_hyper(p, &cinfo->before);
3650
	xdr_decode_hyper(p, &cinfo->after);
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3651
	return 0;
3652 3653 3654
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3655 3656 3657 3658
}

static int decode_access(struct xdr_stream *xdr, struct nfs4_accessres *access)
{
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3659
	__be32 *p;
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	uint32_t supp, acc;
	int status;

	status = decode_op_hdr(xdr, OP_ACCESS);
	if (status)
		return status;
3666 3667 3668
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
3669
	supp = be32_to_cpup(p++);
3670
	acc = be32_to_cpup(p);
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3671 3672 3673
	access->supported = supp;
	access->access = acc;
	return 0;
3674 3675 3676
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3677 3678
}

3679
static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
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3680
{
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3681
	__be32 *p;
3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698

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

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

static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
{
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3699 3700 3701
	int status;

	status = decode_op_hdr(xdr, OP_CLOSE);
3702 3703
	if (status != -EIO)
		nfs_increment_open_seqid(status, res->seqid);
3704 3705 3706
	if (!status)
		status = decode_stateid(xdr, &res->stateid);
	return status;
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3707 3708
}

3709 3710 3711
static int decode_verifier(struct xdr_stream *xdr, void *verifier)
{
	return decode_opaque_fixed(xdr, verifier, 8);
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3712 3713 3714 3715 3716 3717 3718
}

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

	status = decode_op_hdr(xdr, OP_COMMIT);
3719 3720 3721
	if (!status)
		status = decode_verifier(xdr, res->verf->verifier);
	return status;
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3722 3723 3724 3725
}

static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
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3726
	__be32 *p;
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	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;
3735 3736 3737
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
3738
	bmlen = be32_to_cpup(p);
3739 3740 3741 3742 3743 3744
	p = xdr_inline_decode(xdr, bmlen << 2);
	if (likely(p))
		return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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3745 3746 3747 3748
}

static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
{
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3749
	__be32 *savep;
3750
	uint32_t attrlen, bitmap[2] = {0};
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	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_link_support(xdr, bitmap, &res->has_links)) != 0)
		goto xdr_error;
	if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
		goto xdr_error;
	if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
		goto xdr_error;
	status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
3769
	dprintk("%s: xdr returned %d!\n", __func__, -status);
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3770 3771
	return status;
}
3772

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3773 3774
static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
{
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3775
	__be32 *savep;
3776
	uint32_t attrlen, bitmap[2] = {0};
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3777
	int status;
3778

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3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
		goto xdr_error;
	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
		goto xdr_error;
	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
		goto xdr_error;

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

	status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
3801
	dprintk("%s: xdr returned %d!\n", __func__, -status);
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3802 3803 3804 3805 3806
	return status;
}

static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
{
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3807
	__be32 *savep;
3808
	uint32_t attrlen, bitmap[2] = {0};
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3809
	int status;
3810

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3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824
	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:
3825
	dprintk("%s: xdr returned %d!\n", __func__, -status);
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	return status;
}

3829 3830
static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
		struct nfs_fattr *fattr, struct nfs_fh *fh,
3831
		const struct nfs_server *server, int may_sleep)
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3832
{
3833 3834
	int status;
	umode_t fmode = 0;
3835
	uint64_t fileid;
3836
	uint32_t type;
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3837

3838 3839
	status = decode_attr_type(xdr, bitmap, &type);
	if (status < 0)
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3840
		goto xdr_error;
3841 3842 3843 3844 3845
	fattr->mode = 0;
	if (status != 0) {
		fattr->mode |= nfs_type2fmt[type];
		fattr->valid |= status;
	}
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3846

3847 3848
	status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
	if (status < 0)
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		goto xdr_error;
3850
	fattr->valid |= status;
3851 3852 3853

	status = decode_attr_size(xdr, bitmap, &fattr->size);
	if (status < 0)
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3854
		goto xdr_error;
3855
	fattr->valid |= status;
3856 3857 3858

	status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
	if (status < 0)
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		goto xdr_error;
3860
	fattr->valid |= status;
3861

3862 3863 3864 3865 3866 3867 3868 3869
	status = decode_attr_error(xdr, bitmap);
	if (status < 0)
		goto xdr_error;

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

3870 3871
	status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
	if (status < 0)
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		goto xdr_error;
3873
	fattr->valid |= status;
3874 3875

	status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
3876
						struct nfs4_fs_locations,
3877 3878
						fattr));
	if (status < 0)
3879
		goto xdr_error;
3880
	fattr->valid |= status;
3881 3882 3883

	status = decode_attr_mode(xdr, bitmap, &fmode);
	if (status < 0)
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		goto xdr_error;
3885 3886 3887 3888
	if (status != 0) {
		fattr->mode |= fmode;
		fattr->valid |= status;
	}
3889 3890 3891

	status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
	if (status < 0)
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3892
		goto xdr_error;
3893
	fattr->valid |= status;
3894

3895 3896
	status = decode_attr_owner(xdr, bitmap, server->nfs_client,
			&fattr->uid, may_sleep);
3897
	if (status < 0)
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3898
		goto xdr_error;
3899
	fattr->valid |= status;
3900

3901 3902
	status = decode_attr_group(xdr, bitmap, server->nfs_client,
			&fattr->gid, may_sleep);
3903
	if (status < 0)
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		goto xdr_error;
3905
	fattr->valid |= status;
3906 3907 3908

	status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
	if (status < 0)
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		goto xdr_error;
3910
	fattr->valid |= status;
3911 3912 3913

	status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
	if (status < 0)
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		goto xdr_error;
3915
	fattr->valid |= status;
3916 3917 3918

	status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
	if (status < 0)
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		goto xdr_error;
3920
	fattr->valid |= status;
3921 3922 3923

	status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
	if (status < 0)
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		goto xdr_error;
3925
	fattr->valid |= status;
3926 3927 3928

	status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
	if (status < 0)
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		goto xdr_error;
3930
	fattr->valid |= status;
3931 3932 3933

	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid);
	if (status < 0)
3934
		goto xdr_error;
3935
	if (status != 0 && !(fattr->valid & status)) {
3936
		fattr->fileid = fileid;
3937 3938
		fattr->valid |= status;
	}
3939

3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968
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, const struct nfs_server *server, int may_sleep)
{
	__be32 *savep;
	uint32_t attrlen,
		 bitmap[2] = {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, server, may_sleep);
	if (status < 0)
		goto xdr_error;

3969
	status = verify_attr_len(xdr, savep, attrlen);
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xdr_error:
3971
	dprintk("%s: xdr returned %d\n", __func__, -status);
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	return status;
}

3975 3976 3977 3978 3979
static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
		const struct nfs_server *server, int may_sleep)
{
	return decode_getfattr_generic(xdr, fattr, NULL, server, may_sleep);
}
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/*
 * Decode potentially multiple layout types. Currently we only support
 * one layout driver per file system.
 */
static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
					 uint32_t *layouttype)
{
	uint32_t *p;
	int num;

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

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

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

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

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

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static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
{
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	__be32 *savep;
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	uint32_t attrlen, bitmap[2];
	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;
4061
	status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4062 4063 4064
	if (status != 0)
		goto xdr_error;
	status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4065 4066
	if (status != 0)
		goto xdr_error;
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	status = verify_attr_len(xdr, savep, attrlen);
xdr_error:
4070
	dprintk("%s: xdr returned %d!\n", __func__, -status);
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	return status;
}

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

4080 4081 4082
	/* Zero handle first to allow comparisons */
	memset(fh, 0, sizeof(*fh));

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

4087 4088 4089
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
4090
	len = be32_to_cpup(p);
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	if (len > NFS4_FHSIZE)
		return -EIO;
	fh->size = len;
4094 4095 4096
	p = xdr_inline_decode(xdr, len);
	if (unlikely(!p))
		goto out_overflow;
4097
	memcpy(fh->data, p, len);
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	return 0;
4099 4100 4101
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
{
	int status;
4107

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	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.
 */
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static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
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{
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	uint64_t offset, length, clientid;
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	__be32 *p;
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	uint32_t namelen, type;
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4122

4123
	p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4124 4125
	if (unlikely(!p))
		goto out_overflow;
4126
	p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4127
	p = xdr_decode_hyper(p, &length);
4128 4129
	type = be32_to_cpup(p++); /* 4 byte read */
	if (fl != NULL) { /* manipulate file lock */
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		fl->fl_start = (loff_t)offset;
		fl->fl_end = fl->fl_start + (loff_t)length - 1;
		if (length == ~(uint64_t)0)
			fl->fl_end = OFFSET_MAX;
		fl->fl_type = F_WRLCK;
		if (type & 1)
			fl->fl_type = F_RDLCK;
		fl->fl_pid = 0;
	}
4139 4140 4141
	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 */
4142 4143 4144 4145 4146
	if (likely(p))
		return -NFS4ERR_DENIED;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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

	status = decode_op_hdr(xdr, OP_LOCK);
4154 4155
	if (status == -EIO)
		goto out;
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	if (status == 0) {
4157 4158 4159
		status = decode_stateid(xdr, &res->stateid);
		if (unlikely(status))
			goto out;
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	} else if (status == -NFS4ERR_DENIED)
4161 4162 4163 4164 4165
		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:
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	return status;
}

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

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

	status = decode_op_hdr(xdr, OP_LOCKU);
4183 4184
	if (status != -EIO)
		nfs_increment_lock_seqid(status, res->seqid);
4185 4186
	if (status == 0)
		status = decode_stateid(xdr, &res->stateid);
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	return status;
}

4190 4191 4192 4193 4194
static int decode_release_lockowner(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
}

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

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

4206 4207 4208
	p = xdr_inline_decode(xdr, 12);
	if (unlikely(!p))
		goto out_overflow;
4209
	limit_type = be32_to_cpup(p++);
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	switch (limit_type) {
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	case 1:
4212
		xdr_decode_hyper(p, maxsize);
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		break;
	case 2:
4215
		nblocks = be32_to_cpup(p++);
4216
		blocksize = be32_to_cpup(p);
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		*maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
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	}
	return 0;
4220 4221 4222
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
{
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	__be32 *p;
	uint32_t delegation_type;
4229
	int status;
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4231 4232 4233
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
4234
	delegation_type = be32_to_cpup(p);
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	if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
		res->delegation_type = 0;
		return 0;
	}
4239 4240 4241
	status = decode_stateid(xdr, &res->delegation);
	if (unlikely(status))
		return status;
4242 4243 4244
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
4245
	res->do_recall = be32_to_cpup(p);
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	switch (delegation_type) {
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	case NFS4_OPEN_DELEGATE_READ:
		res->delegation_type = FMODE_READ;
		break;
	case NFS4_OPEN_DELEGATE_WRITE:
		res->delegation_type = FMODE_WRITE|FMODE_READ;
		if (decode_space_limit(xdr, &res->maxsize) < 0)
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				return -EIO;
	}
4256
	return decode_ace(xdr, NULL, res->server->nfs_client);
4257 4258 4259
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
{
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	__be32 *p;
4265
	uint32_t savewords, bmlen, i;
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	int status;
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	status = decode_op_hdr(xdr, OP_OPEN);
4269 4270
	if (status != -EIO)
		nfs_increment_open_seqid(status, res->seqid);
4271 4272 4273
	if (!status)
		status = decode_stateid(xdr, &res->stateid);
	if (unlikely(status))
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		return status;
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	decode_change_info(xdr, &res->cinfo);
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4278 4279 4280
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
4281
	res->rflags = be32_to_cpup(p++);
4282
	bmlen = be32_to_cpup(p);
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	if (bmlen > 10)
		goto xdr_error;
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4286 4287 4288
	p = xdr_inline_decode(xdr, bmlen << 2);
	if (unlikely(!p))
		goto out_overflow;
4289 4290
	savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
	for (i = 0; i < savewords; ++i)
4291
		res->attrset[i] = be32_to_cpup(p++);
4292 4293 4294
	for (; i < NFS4_BITMAP_SIZE; i++)
		res->attrset[i] = 0;

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	return decode_delegation(xdr, res);
xdr_error:
4297
	dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
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	return -EIO;
4299 4300 4301
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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

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	status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
4309 4310
	if (status != -EIO)
		nfs_increment_open_seqid(status, res->seqid);
4311 4312 4313
	if (!status)
		status = decode_stateid(xdr, &res->stateid);
	return status;
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}

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

	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
4321 4322
	if (status != -EIO)
		nfs_increment_open_seqid(status, res->seqid);
4323 4324 4325
	if (!status)
		status = decode_stateid(xdr, &res->stateid);
	return status;
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}

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

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

static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
{
	struct kvec *iov = req->rq_rcv_buf.head;
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	__be32 *p;
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	uint32_t count, eof, recvd, hdrlen;
	int status;

	status = decode_op_hdr(xdr, OP_READ);
	if (status)
		return status;
4348 4349 4350
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
4351
	eof = be32_to_cpup(p++);
4352
	count = be32_to_cpup(p);
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	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
	recvd = req->rq_rcv_buf.len - hdrlen;
	if (count > recvd) {
4356
		dprintk("NFS: server cheating in read reply: "
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				"count %u > recvd %u\n", count, recvd);
		count = recvd;
		eof = 0;
	}
	xdr_read_pages(xdr, count);
	res->eof = eof;
	res->count = count;
	return 0;
4365 4366 4367
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
{
	struct xdr_buf	*rcvbuf = &req->rq_rcv_buf;
	struct kvec	*iov = rcvbuf->head;
4374 4375 4376
	size_t		hdrlen;
	u32		recvd, pglen = rcvbuf->page_len;
	int		status;
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	status = decode_op_hdr(xdr, OP_READDIR);
4379 4380 4381
	if (!status)
		status = decode_verifier(xdr, readdir->verifier.data);
	if (unlikely(status))
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		return status;
4383 4384
	dprintk("%s: verifier = %08x:%08x\n",
			__func__,
4385 4386 4387
			((u32 *)readdir->verifier.data)[0],
			((u32 *)readdir->verifier.data)[1]);

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4388

4389
	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
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	recvd = rcvbuf->len - hdrlen;
	if (pglen > recvd)
		pglen = recvd;
	xdr_read_pages(xdr, pglen);

4395

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	return 0;
}

static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
{
	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
	struct kvec *iov = rcvbuf->head;
4403 4404
	size_t hdrlen;
	u32 len, recvd;
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4405
	__be32 *p;
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	int status;

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

	/* Convert length of symlink */
4413 4414 4415
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
4416
	len = be32_to_cpup(p);
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4417
	if (len >= rcvbuf->page_len || len <= 0) {
4418
		dprintk("nfs: server returned giant symlink!\n");
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		return -ENAMETOOLONG;
	}
	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
	recvd = req->rq_rcv_buf.len - hdrlen;
	if (recvd < len) {
4424
		dprintk("NFS: server cheating in readlink reply: "
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4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435
				"count %u > recvd %u\n", len, recvd);
		return -EIO;
	}
	xdr_read_pages(xdr, len);
	/*
	 * The XDR encode routine has set things up so that
	 * the link text will be copied directly into the
	 * buffer.  We just have to do overflow-checking,
	 * and and null-terminate the text (the VFS expects
	 * null-termination).
	 */
4436
	xdr_terminate_string(rcvbuf, len);
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4437
	return 0;
4438 4439 4440
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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);
}

4475 4476 4477 4478 4479 4480
static int
decode_restorefh(struct xdr_stream *xdr)
{
	return decode_op_hdr(xdr, OP_RESTOREFH);
}

4481 4482 4483
static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
		size_t *acl_len)
{
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4484
	__be32 *savep;
4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500
	uint32_t attrlen,
		 bitmap[2] = {0};
	struct kvec *iov = req->rq_rcv_buf.head;
	int status;

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

	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
		return -EIO;
	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
4501 4502
		size_t hdrlen;
		u32 recvd;
4503 4504 4505 4506 4507 4508

		/* We ignore &savep and don't do consistency checks on
		 * the attr length.  Let userspace figure it out.... */
		hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
		recvd = req->rq_rcv_buf.len - hdrlen;
		if (attrlen > recvd) {
4509
			dprintk("NFS: server cheating in getattr"
4510 4511 4512 4513
					" acl reply: attrlen %u > recvd %u\n",
					attrlen, recvd);
			return -EINVAL;
		}
4514
		xdr_read_pages(xdr, attrlen);
4515
		*acl_len = attrlen;
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	} else
		status = -EOPNOTSUPP;
4518 4519 4520 4521 4522

out:
	return status;
}

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

4529
static int decode_setattr(struct xdr_stream *xdr)
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4530
{
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4531
	__be32 *p;
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	uint32_t bmlen;
	int status;

	status = decode_op_hdr(xdr, OP_SETATTR);
	if (status)
		return status;
4538 4539 4540
	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
4541
	bmlen = be32_to_cpup(p);
4542 4543 4544 4545 4546 4547
	p = xdr_inline_decode(xdr, bmlen << 2);
	if (likely(p))
		return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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4548 4549
}

4550
static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
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4551
{
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4552
	__be32 *p;
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	uint32_t opnum;
	int32_t nfserr;

4556 4557 4558
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
4559
	opnum = be32_to_cpup(p++);
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4560
	if (opnum != OP_SETCLIENTID) {
4561
		dprintk("nfs: decode_setclientid: Server returned operation"
4562
			" %d\n", opnum);
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4563 4564
		return -EIO;
	}
4565
	nfserr = be32_to_cpup(p);
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4566
	if (nfserr == NFS_OK) {
4567 4568 4569
		p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
		if (unlikely(!p))
			goto out_overflow;
4570 4571
		p = xdr_decode_hyper(p, &res->clientid);
		memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
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4572 4573 4574 4575
	} else if (nfserr == NFSERR_CLID_INUSE) {
		uint32_t len;

		/* skip netid string */
4576 4577 4578
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
4579
		len = be32_to_cpup(p);
4580 4581 4582
		p = xdr_inline_decode(xdr, len);
		if (unlikely(!p))
			goto out_overflow;
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4583 4584

		/* skip uaddr string */
4585 4586 4587
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
4588
		len = be32_to_cpup(p);
4589 4590 4591
		p = xdr_inline_decode(xdr, len);
		if (unlikely(!p))
			goto out_overflow;
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4592 4593
		return -NFSERR_CLID_INUSE;
	} else
4594
		return nfs4_stat_to_errno(nfserr);
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4595 4596

	return 0;
4597 4598 4599
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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}

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

static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
{
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4609
	__be32 *p;
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	int status;

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

4616 4617 4618
	p = xdr_inline_decode(xdr, 16);
	if (unlikely(!p))
		goto out_overflow;
4619 4620
	res->count = be32_to_cpup(p++);
	res->verf->committed = be32_to_cpup(p++);
4621
	memcpy(res->verf->verifier, p, 8);
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4622
	return 0;
4623 4624 4625
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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4626 4627 4628 4629 4630 4631 4632
}

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

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4633 4634 4635 4636 4637 4638
#if defined(CONFIG_NFS_V4_1)
static int decode_exchange_id(struct xdr_stream *xdr,
			      struct nfs41_exchange_id_res *res)
{
	__be32 *p;
	uint32_t dummy;
4639
	char *dummy_str;
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4640 4641 4642 4643 4644 4645 4646
	int status;
	struct nfs_client *clp = res->client;

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

4647 4648 4649
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
4650
	xdr_decode_hyper(p, &clp->cl_ex_clid);
4651 4652 4653
	p = xdr_inline_decode(xdr, 12);
	if (unlikely(!p))
		goto out_overflow;
4654 4655
	clp->cl_seqid = be32_to_cpup(p++);
	clp->cl_exchange_flags = be32_to_cpup(p++);
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4656 4657

	/* We ask for SP4_NONE */
4658
	dummy = be32_to_cpup(p);
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4659 4660 4661 4662
	if (dummy != SP4_NONE)
		return -EIO;

	/* Throw away minor_id */
4663 4664 4665
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
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4666 4667

	/* Throw away Major id */
4668 4669 4670
	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
	if (unlikely(status))
		return status;
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4671 4672

	/* Throw away server_scope */
4673 4674 4675
	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
	if (unlikely(status))
		return status;
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4676 4677

	/* Throw away Implementation id array */
4678 4679 4680
	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
	if (unlikely(status))
		return status;
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4681 4682

	return 0;
4683 4684 4685
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
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4686
}
4687 4688 4689 4690 4691 4692 4693

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

4694 4695 4696
	p = xdr_inline_decode(xdr, 28);
	if (unlikely(!p))
		goto out_overflow;
4697 4698 4699 4700 4701 4702
	attrs->headerpadsz = be32_to_cpup(p++);
	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++);
4703
	nr_attrs = be32_to_cpup(p);
4704 4705 4706 4707 4708
	if (unlikely(nr_attrs > 1)) {
		printk(KERN_WARNING "%s: Invalid rdma channel attrs count %u\n",
			__func__, nr_attrs);
		return -EINVAL;
	}
4709 4710 4711 4712 4713
	if (nr_attrs == 1) {
		p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
		if (unlikely(!p))
			goto out_overflow;
	}
4714
	return 0;
4715 4716 4717
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
4718 4719
}

4720 4721 4722
static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
{
	return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733
}

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

	status = decode_op_hdr(xdr, OP_CREATE_SESSION);
4734 4735 4736
	if (!status)
		status = decode_sessionid(xdr, &session->sess_id);
	if (unlikely(status))
4737 4738 4739
		return status;

	/* seqid, flags */
4740 4741 4742
	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;
4743
	clp->cl_seqid = be32_to_cpup(p++);
4744
	session->flags = be32_to_cpup(p);
4745 4746 4747 4748 4749 4750

	/* Channel attributes */
	status = decode_chan_attrs(xdr, &session->fc_attrs);
	if (!status)
		status = decode_chan_attrs(xdr, &session->bc_attrs);
	return status;
4751 4752 4753
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
4754
}
4755 4756 4757 4758 4759

static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
{
	return decode_op_hdr(xdr, OP_DESTROY_SESSION);
}
4760 4761 4762 4763 4764

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

4767 4768 4769 4770 4771
static int decode_sequence(struct xdr_stream *xdr,
			   struct nfs4_sequence_res *res,
			   struct rpc_rqst *rqstp)
{
#if defined(CONFIG_NFS_V4_1)
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4772 4773 4774 4775 4776
	struct nfs4_sessionid id;
	u32 dummy;
	int status;
	__be32 *p;

4777 4778 4779
	if (!res->sr_session)
		return 0;

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4780
	status = decode_op_hdr(xdr, OP_SEQUENCE);
4781 4782 4783
	if (!status)
		status = decode_sessionid(xdr, &id);
	if (unlikely(status))
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4784
		goto out_err;
4785

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	/*
	 * If the server returns different values for sessionID, slotID or
	 * sequence number, the server is looney tunes.
	 */
4790
	status = -EREMOTEIO;
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	if (memcmp(id.data, res->sr_session->sess_id.data,
		   NFS4_MAX_SESSIONID_LEN)) {
		dprintk("%s Invalid session id\n", __func__);
		goto out_err;
	}
4797

4798 4799 4800
	p = xdr_inline_decode(xdr, 20);
	if (unlikely(!p))
		goto out_overflow;
4801

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4802
	/* seqid */
4803
	dummy = be32_to_cpup(p++);
4804
	if (dummy != res->sr_slot->seq_nr) {
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4805 4806 4807 4808
		dprintk("%s Invalid sequence number\n", __func__);
		goto out_err;
	}
	/* slot id */
4809
	dummy = be32_to_cpup(p++);
4810
	if (dummy != res->sr_slot - res->sr_session->fc_slot_table.slots) {
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		dprintk("%s Invalid slot id\n", __func__);
		goto out_err;
	}
	/* highest slot id - currently not processed */
4815
	dummy = be32_to_cpup(p++);
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4816
	/* target highest slot id - currently not processed */
4817
	dummy = be32_to_cpup(p++);
4818 4819
	/* result flags */
	res->sr_status_flags = be32_to_cpup(p);
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	status = 0;
out_err:
	res->sr_status = status;
	return status;
4824 4825 4826 4827
out_overflow:
	print_overflow_msg(__func__, xdr);
	status = -EIO;
	goto out_err;
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4828
#else  /* CONFIG_NFS_V4_1 */
4829
	return 0;
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4830
#endif /* CONFIG_NFS_V4_1 */
4831 4832
}

4833 4834 4835 4836
/*
 * END OF "GENERIC" DECODE ROUTINES.
 */

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/*
 * Decode OPEN_DOWNGRADE response
 */
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4840
static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
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4841
{
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	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
4848 4849 4850
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_open_downgrade(&xdr, res);
4857 4858
	if (status != 0)
		goto out;
4859 4860
	decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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4861
out:
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	return status;
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}

/*
 * Decode ACCESS response
 */
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static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_accessres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
4873

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4874
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4875 4876 4877 4878 4879
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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		goto out;
4881 4882 4883 4884 4885 4886
	status = decode_putfh(&xdr);
	if (status != 0)
		goto out;
	status = decode_access(&xdr, res);
	if (status != 0)
		goto out;
4887 4888
	decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode LOOKUP response
 */
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static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
4901

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	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4903 4904 4905 4906 4907
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_lookup(&xdr)) != 0)
		goto out;
	if ((status = decode_getfh(&xdr, res->fh)) != 0)
		goto out;
4915 4916
	status = decode_getfattr(&xdr, res->fattr, res->server
			,!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode LOOKUP_ROOT response
 */
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4924
static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
4929

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	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4931 4932 4933 4934 4935
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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4936 4937 4938 4939
		goto out;
	if ((status = decode_putrootfh(&xdr)) != 0)
		goto out;
	if ((status = decode_getfh(&xdr, res->fh)) == 0)
4940 4941
		status = decode_getfattr(&xdr, res->fattr, res->server,
				!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode REMOVE response
 */
4949
static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, __be32 *p, struct nfs_removeres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
4954

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4955
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4956 4957 4958 4959 4960
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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4961
		goto out;
4962 4963 4964 4965
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_remove(&xdr, &res->cinfo)) != 0)
		goto out;
4966
	decode_getfattr(&xdr, res->dir_attr, res->server,
4967
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode RENAME response
 */
4975
static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, __be32 *p, struct nfs_renameres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
4980

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	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4982 4983 4984 4985 4986
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_savefh(&xdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
4994 4995 4996
	if ((status = decode_rename(&xdr, &res->old_cinfo, &res->new_cinfo)) != 0)
		goto out;
	/* Current FH is target directory */
4997 4998
	if (decode_getfattr(&xdr, res->new_fattr, res->server,
				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4999 5000 5001
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
5002 5003
	decode_getfattr(&xdr, res->old_fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode LINK response
 */
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static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_link_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
5016

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	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5018 5019 5020 5021 5022
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_savefh(&xdr)) != 0)
		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
5030 5031 5032 5033 5034 5035
	if ((status = decode_link(&xdr, &res->cinfo)) != 0)
		goto out;
	/*
	 * Note order: OP_LINK leaves the directory as the current
	 *             filehandle.
	 */
5036 5037
	if (decode_getfattr(&xdr, res->dir_attr, res->server,
				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5038 5039 5040
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
5041 5042
	decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode CREATE response
 */
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5050
static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
5055

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5056
	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5057 5058 5059 5060 5061
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (status)
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		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
5065 5066
	if ((status = decode_savefh(&xdr)) != 0)
		goto out;
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	if ((status = decode_create(&xdr,&res->dir_cinfo)) != 0)
		goto out;
	if ((status = decode_getfh(&xdr, res->fh)) != 0)
		goto out;
5071 5072
	if (decode_getfattr(&xdr, res->fattr, res->server,
				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5073 5074 5075
		goto out;
	if ((status = decode_restorefh(&xdr)) != 0)
		goto out;
5076 5077
	decode_getfattr(&xdr, res->dir_fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
 * Decode SYMLINK response
 */
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static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
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{
	return nfs4_xdr_dec_create(rqstp, p, res);
}

/*
 * Decode GETATTR response
 */
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5093
static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_getattr_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;
5098

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	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
5101 5102 5103
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
5109 5110
	status = decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

5115 5116 5117 5118
/*
 * Encode an SETACL request
 */
static int
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nfs4_xdr_enc_setacl(struct rpc_rqst *req, __be32 *p, struct nfs_setaclargs *args)
5120
{
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	struct xdr_stream xdr;
	struct compound_hdr hdr = {
5123
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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	};
	int status;

	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
5128
	encode_compound_hdr(&xdr, req, &hdr);
5129
	encode_sequence(&xdr, &args->seq_args, &hdr);
5130
	encode_putfh(&xdr, args->fh, &hdr);
5131 5132
	status = encode_setacl(&xdr, args, &hdr);
	encode_nops(&hdr);
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5133
	return status;
5134
}
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5135

5136 5137 5138 5139
/*
 * Decode SETACL response
 */
static int
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nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, __be32 *p,
		    struct nfs_setaclres *res)
5142 5143 5144 5145 5146 5147 5148
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
5149 5150 5151
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5152 5153 5154 5155 5156
	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
5157
	status = decode_setattr(&xdr);
5158 5159 5160
out:
	return status;
}
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5161

5162 5163 5164 5165
/*
 * Decode GETACL response
 */
static int
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nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, __be32 *p,
		    struct nfs_getaclres *res)
5168 5169 5170 5171 5172 5173 5174
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
5175 5176 5177
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5178 5179 5180 5181 5182
	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
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	status = decode_getacl(&xdr, rqstp, &res->acl_len);
5184 5185 5186 5187 5188

out:
	return status;
}

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/*
 * Decode CLOSE response
 */
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5192
static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
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5193
{
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	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
5200 5201 5202
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_close(&xdr, res);
5209 5210 5211 5212 5213 5214 5215 5216
	if (status != 0)
		goto out;
	/*
	 * Note: Server may do delete on close for this file
	 * 	in which case the getattr call will fail with
	 * 	an ESTALE error. Shouldn't be a problem,
	 * 	though, since fattr->valid will remain unset.
	 */
5217 5218
	decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
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	return status;
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}

/*
 * Decode OPEN response
 */
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5226
static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
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5227
{
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	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
5234 5235 5236
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_savefh(&xdr);
	if (status)
		goto out;
	status = decode_open(&xdr, res);
5246 5247
	if (status)
		goto out;
5248
	if (decode_getfh(&xdr, &res->fh) != 0)
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5249
		goto out;
5250 5251
	if (decode_getfattr(&xdr, res->f_attr, res->server,
				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5252
		goto out;
5253
	if (decode_restorefh(&xdr) != 0)
5254
		goto out;
5255 5256
	decode_getfattr(&xdr, res->dir_attr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
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5258
	return status;
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}

/*
 * Decode OPEN_CONFIRM response
 */
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static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp, __be32 *p, struct nfs_open_confirmres *res)
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5265
{
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	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_open_confirm(&xdr, res);
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out:
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	return status;
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}

/*
 * Decode OPEN response
 */
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static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
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{
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	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
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	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_open(&xdr, res);
	if (status)
		goto out;
5304 5305
	decode_getfattr(&xdr, res->f_attr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
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5307
	return status;
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}

/*
 * Decode SETATTR response
 */
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static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs_setattrres *res)
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{
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	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
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	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
5329
	status = decode_setattr(&xdr);
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	if (status)
		goto out;
5332 5333
	decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
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	return status;
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}

/*
 * Decode LOCK response
 */
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static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, __be32 *p, struct nfs_lock_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
 * Decode LOCKT response
 */
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static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, __be32 *p, struct nfs_lockt_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
 * Decode LOCKU response
 */
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5389
static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, __be32 *p, struct nfs_locku_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

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static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp, __be32 *p, void *dummy)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_release_lockowner(&xdr);
	return status;
}

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/*
 * Decode READLINK response
 */
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static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp, __be32 *p,
				 struct nfs4_readlink_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
 * Decode READDIR response
 */
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static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_readdir_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
 * Decode Read response
 */
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static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, __be32 *p, struct nfs_readres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
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	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	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
 */
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static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, __be32 *p, struct nfs_writeres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
 * Decode COMMIT response
 */
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static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, __be32 *p, struct nfs_writeres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
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	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, rqstp);
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	if (status)
		goto out;
	status = decode_putfh(&xdr);
	if (status)
		goto out;
	status = decode_commit(&xdr, res);
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	if (status)
		goto out;
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	decode_getfattr(&xdr, res->fattr, res->server,
			!RPC_IS_ASYNC(rqstp->rq_task));
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out:
	return status;
}

/*
5557
 * Decode FSINFO response
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 */
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static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, __be32 *p,
			       struct nfs4_fsinfo_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
5578
 * Decode PATHCONF response
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 */
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static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, __be32 *p,
				 struct nfs4_pathconf_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
5599
 * Decode STATFS response
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 */
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static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, __be32 *p,
			       struct nfs4_statfs_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

/*
5620
 * Decode GETATTR_BITMAP response
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 */
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static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req, __be32 *p, struct nfs4_server_caps_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
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	status = decode_compound_hdr(&xdr, &hdr);
	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, req);
	if (status)
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		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	status = decode_server_caps(&xdr, res);
out:
	return status;
}

/*
 * Decode RENEW response
 */
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static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, __be32 *p, void *dummy)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_renew(&xdr);
	return status;
}

/*
5659
 * Decode SETCLIENTID response
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 */
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static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req, __be32 *p,
5662
		struct nfs4_setclientid_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
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		status = decode_setclientid(&xdr, res);
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	return status;
}

/*
5676
 * Decode SETCLIENTID_CONFIRM response
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 */
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static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *fsinfo)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_setclientid_confirm(&xdr);
	if (!status)
		status = decode_putrootfh(&xdr);
	if (!status)
		status = decode_fsinfo(&xdr, fsinfo);
	return status;
}

/*
5696
 * Decode DELEGRETURN response
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 */
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static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_delegreturnres *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

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

5723
/*
5724
 * Decode FS_LOCATIONS response
5725
 */
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static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, __be32 *p,
				     struct nfs4_fs_locations_res *res)
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{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
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	if (status)
		goto out;
	status = decode_sequence(&xdr, &res->seq_res, req);
	if (status)
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		goto out;
	if ((status = decode_putfh(&xdr)) != 0)
		goto out;
	if ((status = decode_lookup(&xdr)) != 0)
		goto out;
	xdr_enter_page(&xdr, PAGE_SIZE);
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	status = decode_getfattr(&xdr, &res->fs_locations->fattr,
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				 res->fs_locations->server,
				 !RPC_IS_ASYNC(req->rq_task));
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out:
	return status;
}

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#if defined(CONFIG_NFS_V4_1)
/*
5754
 * Decode EXCHANGE_ID response
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 */
static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp, uint32_t *p,
				    void *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_exchange_id(&xdr, res);
	return status;
}
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5770
/*
5771
 * Decode CREATE_SESSION response
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 */
static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp, uint32_t *p,
				       struct nfs41_create_session_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_create_session(&xdr, res);
	return status;
}

5787
/*
5788
 * Decode DESTROY_SESSION response
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 */
static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp, uint32_t *p,
					void *dummy)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_destroy_session(&xdr, dummy);
	return status;
}

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/*
5805
 * Decode SEQUENCE response
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 */
static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp, uint32_t *p,
				 struct nfs4_sequence_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_sequence(&xdr, res, rqstp);
	return status;
}

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/*
5822
 * Decode GET_LEASE_TIME response
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 */
static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp, uint32_t *p,
				       struct nfs4_get_lease_time_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	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;
}
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/*
 * Decode RECLAIM_COMPLETE response
 */
static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp, uint32_t *p,
					 struct nfs41_reclaim_complete_res *res)
{
	struct xdr_stream xdr;
	struct compound_hdr hdr;
	int status;

	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
	status = decode_compound_hdr(&xdr, &hdr);
	if (!status)
		status = decode_sequence(&xdr, &res->seq_res, rqstp);
	if (!status)
		status = decode_reclaim_complete(&xdr, (void *)NULL);
	return status;
}
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#endif /* CONFIG_NFS_V4_1 */

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__be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
			   struct nfs_server *server, int plus)
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{
	uint32_t bitmap[2] = {0};
	uint32_t len;
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	__be32 *p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
	if (!ntohl(*p++)) {
		p = xdr_inline_decode(xdr, 4);
		if (unlikely(!p))
			goto out_overflow;
		if (!ntohl(*p++))
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			return ERR_PTR(-EAGAIN);
		entry->eof = 1;
		return ERR_PTR(-EBADCOOKIE);
	}

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	p = xdr_inline_decode(xdr, 12);
	if (unlikely(!p))
		goto out_overflow;
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	entry->prev_cookie = entry->cookie;
	p = xdr_decode_hyper(p, &entry->cookie);
	entry->len = ntohl(*p++);
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5887
	p = xdr_inline_decode(xdr, entry->len);
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	if (unlikely(!p))
		goto out_overflow;
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	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;
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	entry->fattr->valid = 0;
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	if (decode_attr_bitmap(xdr, bitmap) < 0)
		goto out_overflow;

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

	if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh, server, 1) < 0)
		goto out_overflow;
	if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
		entry->ino = entry->fattr->fileid;

	if (verify_attr_len(xdr, p, len) < 0)
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		goto out_overflow;
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	p = xdr_inline_peek(xdr, 8);
	if (p != NULL)
		entry->eof = !p[0] && p[1];
	else
		entry->eof = 0;

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

/*
 * We need to translate between nfs status return values and
 * the local errno values which may not be the same.
 */
static struct {
	int stat;
	int errno;
} nfs_errtbl[] = {
	{ NFS4_OK,		0		},
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	{ NFS4ERR_PERM,		-EPERM		},
	{ NFS4ERR_NOENT,	-ENOENT		},
	{ NFS4ERR_IO,		-errno_NFSERR_IO},
	{ NFS4ERR_NXIO,		-ENXIO		},
	{ NFS4ERR_ACCESS,	-EACCES		},
	{ NFS4ERR_EXIST,	-EEXIST		},
	{ NFS4ERR_XDEV,		-EXDEV		},
	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
	{ NFS4ERR_ISDIR,	-EISDIR		},
	{ NFS4ERR_INVAL,	-EINVAL		},
	{ NFS4ERR_FBIG,		-EFBIG		},
	{ NFS4ERR_NOSPC,	-ENOSPC		},
	{ NFS4ERR_ROFS,		-EROFS		},
	{ NFS4ERR_MLINK,	-EMLINK		},
	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
	{ NFS4ERR_DQUOT,	-EDQUOT		},
	{ NFS4ERR_STALE,	-ESTALE		},
	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
	{ NFS4ERR_BADOWNER,	-EINVAL		},
	{ NFS4ERR_BADNAME,	-EINVAL		},
	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
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	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
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	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
	{ NFS4ERR_LOCKED,	-EAGAIN		},
	{ NFS4ERR_SYMLINK,	-ELOOP		},
	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
	{ NFS4ERR_WRONGSEC,	-EPERM		}, /* FIXME: this needs
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						    * to be handled by a
						    * middle-layer.
						    */
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	{ -1,			-EIO		}
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};

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

#define PROC(proc, argtype, restype)				\
[NFSPROC4_CLNT_##proc] = {					\
	.p_proc   = NFSPROC4_COMPOUND,				\
	.p_encode = (kxdrproc_t) nfs4_xdr_##argtype,		\
	.p_decode = (kxdrproc_t) nfs4_xdr_##restype,		\
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	.p_arglen = NFS4_##argtype##_sz,			\
	.p_replen = NFS4_##restype##_sz,			\
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	.p_statidx = NFSPROC4_CLNT_##proc,			\
	.p_name   = #proc,					\
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}
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struct rpc_procinfo	nfs4_procedures[] = {
  PROC(READ,		enc_read,	dec_read),
  PROC(WRITE,		enc_write,	dec_write),
  PROC(COMMIT,		enc_commit,	dec_commit),
  PROC(OPEN,		enc_open,	dec_open),
  PROC(OPEN_CONFIRM,	enc_open_confirm,	dec_open_confirm),
  PROC(OPEN_NOATTR,	enc_open_noattr,	dec_open_noattr),
  PROC(OPEN_DOWNGRADE,	enc_open_downgrade,	dec_open_downgrade),
  PROC(CLOSE,		enc_close,	dec_close),
  PROC(SETATTR,		enc_setattr,	dec_setattr),
  PROC(FSINFO,		enc_fsinfo,	dec_fsinfo),
  PROC(RENEW,		enc_renew,	dec_renew),
  PROC(SETCLIENTID,	enc_setclientid,	dec_setclientid),
  PROC(SETCLIENTID_CONFIRM,	enc_setclientid_confirm,	dec_setclientid_confirm),
  PROC(LOCK,            enc_lock,       dec_lock),
  PROC(LOCKT,           enc_lockt,      dec_lockt),
  PROC(LOCKU,           enc_locku,      dec_locku),
  PROC(ACCESS,		enc_access,	dec_access),
  PROC(GETATTR,		enc_getattr,	dec_getattr),
  PROC(LOOKUP,		enc_lookup,	dec_lookup),
  PROC(LOOKUP_ROOT,	enc_lookup_root,	dec_lookup_root),
  PROC(REMOVE,		enc_remove,	dec_remove),
  PROC(RENAME,		enc_rename,	dec_rename),
  PROC(LINK,		enc_link,	dec_link),
  PROC(SYMLINK,		enc_symlink,	dec_symlink),
  PROC(CREATE,		enc_create,	dec_create),
  PROC(PATHCONF,	enc_pathconf,	dec_pathconf),
  PROC(STATFS,		enc_statfs,	dec_statfs),
  PROC(READLINK,	enc_readlink,	dec_readlink),
  PROC(READDIR,		enc_readdir,	dec_readdir),
  PROC(SERVER_CAPS,	enc_server_caps, dec_server_caps),
  PROC(DELEGRETURN,	enc_delegreturn, dec_delegreturn),
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  PROC(GETACL,		enc_getacl,	dec_getacl),
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  PROC(SETACL,		enc_setacl,	dec_setacl),
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  PROC(FS_LOCATIONS,	enc_fs_locations, dec_fs_locations),
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  PROC(RELEASE_LOCKOWNER, enc_release_lockowner, dec_release_lockowner),
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#if defined(CONFIG_NFS_V4_1)
  PROC(EXCHANGE_ID,	enc_exchange_id,	dec_exchange_id),
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  PROC(CREATE_SESSION,	enc_create_session,	dec_create_session),
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  PROC(DESTROY_SESSION,	enc_destroy_session,	dec_destroy_session),
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  PROC(SEQUENCE,	enc_sequence,	dec_sequence),
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  PROC(GET_LEASE_TIME,	enc_get_lease_time,	dec_get_lease_time),
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  PROC(RECLAIM_COMPLETE, enc_reclaim_complete,  dec_reclaim_complete),
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#endif /* CONFIG_NFS_V4_1 */
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};

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

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