1/*
2 *  fs/nfs/nfs4xdr.c
3 *
4 *  Client-side XDR for NFSv4.
5 *
6 *  Copyright (c) 2002 The Regents of the University of Michigan.
7 *  All rights reserved.
8 *
9 *  Kendrick Smith <kmsmith@umich.edu>
10 *  Andy Adamson   <andros@umich.edu>
11 *
12 *  Redistribution and use in source and binary forms, with or without
13 *  modification, are permitted provided that the following conditions
14 *  are met:
15 *
16 *  1. Redistributions of source code must retain the above copyright
17 *     notice, this list of conditions and the following disclaimer.
18 *  2. Redistributions in binary form must reproduce the above copyright
19 *     notice, this list of conditions and the following disclaimer in the
20 *     documentation and/or other materials provided with the distribution.
21 *  3. Neither the name of the University nor the names of its
22 *     contributors may be used to endorse or promote products derived
23 *     from this software without specific prior written permission.
24 *
25 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/param.h>
39#include <linux/time.h>
40#include <linux/mm.h>
41#include <linux/errno.h>
42#include <linux/string.h>
43#include <linux/in.h>
44#include <linux/pagemap.h>
45#include <linux/proc_fs.h>
46#include <linux/kdev_t.h>
47#include <linux/module.h>
48#include <linux/utsname.h>
49#include <linux/sunrpc/clnt.h>
50#include <linux/sunrpc/msg_prot.h>
51#include <linux/sunrpc/gss_api.h>
52#include <linux/nfs.h>
53#include <linux/nfs4.h>
54#include <linux/nfs_fs.h>
55
56#include "nfs4_fs.h"
57#include "nfs4trace.h"
58#include "internal.h"
59#include "nfs4idmap.h"
60#include "nfs4session.h"
61#include "pnfs.h"
62#include "netns.h"
63
64#define NFSDBG_FACILITY		NFSDBG_XDR
65
66/* Mapping from NFS error code to "errno" error code. */
67#define errno_NFSERR_IO		EIO
68
69struct compound_hdr;
70static int nfs4_stat_to_errno(int);
71static void encode_layoutget(struct xdr_stream *xdr,
72			     const struct nfs4_layoutget_args *args,
73			     struct compound_hdr *hdr);
74static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
75			     struct nfs4_layoutget_res *res);
76
77/* NFSv4 COMPOUND tags are only wanted for debugging purposes */
78#ifdef DEBUG
79#define NFS4_MAXTAGLEN		20
80#else
81#define NFS4_MAXTAGLEN		0
82#endif
83
84/* lock,open owner id:
85 * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
86 */
87#define pagepad_maxsz		(1)
88#define open_owner_id_maxsz	(1 + 2 + 1 + 1 + 2)
89#define lock_owner_id_maxsz	(1 + 1 + 4)
90#define decode_lockowner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
91#define compound_encode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
92#define compound_decode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
93#define op_encode_hdr_maxsz	(1)
94#define op_decode_hdr_maxsz	(2)
95#define encode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))
96#define decode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))
97#define encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
98#define decode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
99#define encode_putfh_maxsz	(op_encode_hdr_maxsz + 1 + \
100				(NFS4_FHSIZE >> 2))
101#define decode_putfh_maxsz	(op_decode_hdr_maxsz)
102#define encode_putrootfh_maxsz	(op_encode_hdr_maxsz)
103#define decode_putrootfh_maxsz	(op_decode_hdr_maxsz)
104#define encode_getfh_maxsz      (op_encode_hdr_maxsz)
105#define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
106				((3+NFS4_FHSIZE) >> 2))
107#define nfs4_fattr_bitmap_maxsz 4
108#define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
109#define nfstime4_maxsz		(3)
110#define nfs4_name_maxsz		(1 + ((3 + NFS4_MAXNAMLEN) >> 2))
111#define nfs4_path_maxsz		(1 + ((3 + NFS4_MAXPATHLEN) >> 2))
112#define nfs4_owner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
113#define nfs4_group_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
114#ifdef CONFIG_NFS_V4_SECURITY_LABEL
115/* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
116#define	nfs4_label_maxsz	(4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
117#else
118#define	nfs4_label_maxsz	0
119#endif
120/* We support only one layout type per file system */
121#define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
122/* This is based on getfattr, which uses the most attributes: */
123#define nfs4_fattr_value_maxsz	(1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
124				3*nfstime4_maxsz + \
125				nfs4_owner_maxsz + \
126				nfs4_group_maxsz + nfs4_label_maxsz + \
127				 decode_mdsthreshold_maxsz))
128#define nfs4_fattr_maxsz	(nfs4_fattr_bitmap_maxsz + \
129				nfs4_fattr_value_maxsz)
130#define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
131#define encode_attrs_maxsz	(nfs4_fattr_bitmap_maxsz + \
132				 1 + 2 + 1 + \
133				nfs4_owner_maxsz + \
134				nfs4_group_maxsz + \
135				nfs4_label_maxsz + \
136				1 + nfstime4_maxsz + \
137				1 + nfstime4_maxsz)
138#define encode_savefh_maxsz     (op_encode_hdr_maxsz)
139#define decode_savefh_maxsz     (op_decode_hdr_maxsz)
140#define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
141#define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
142#define encode_fsinfo_maxsz	(encode_getattr_maxsz)
143/* The 5 accounts for the PNFS attributes, and assumes that at most three
144 * layout types will be returned.
145 */
146#define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + \
147				 nfs4_fattr_bitmap_maxsz + 1 + \
148				 1 /* lease time */ + \
149				 2 /* max filesize */ + \
150				 2 /* max read */ + \
151				 2 /* max write */ + \
152				 nfstime4_maxsz /* time delta */ + \
153				 5 /* fs layout types */ + \
154				 1 /* layout blksize */ + \
155				 1 /* clone blksize */ + \
156				 1 /* change attr type */ + \
157				 1 /* xattr support */)
158#define encode_renew_maxsz	(op_encode_hdr_maxsz + 3)
159#define decode_renew_maxsz	(op_decode_hdr_maxsz)
160#define encode_setclientid_maxsz \
161				(op_encode_hdr_maxsz + \
162				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
163				/* client name */ \
164				1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
165				1 /* sc_prog */ + \
166				1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
167				1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
168				1) /* sc_cb_ident */
169#define decode_setclientid_maxsz \
170				(op_decode_hdr_maxsz + \
171				2 /* clientid */ + \
172				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
173				1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
174				1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
175#define encode_setclientid_confirm_maxsz \
176				(op_encode_hdr_maxsz + \
177				3 + (NFS4_VERIFIER_SIZE >> 2))
178#define decode_setclientid_confirm_maxsz \
179				(op_decode_hdr_maxsz)
180#define encode_lookup_maxsz	(op_encode_hdr_maxsz + nfs4_name_maxsz)
181#define decode_lookup_maxsz	(op_decode_hdr_maxsz)
182#define encode_lookupp_maxsz	(op_encode_hdr_maxsz)
183#define decode_lookupp_maxsz	(op_decode_hdr_maxsz)
184#define encode_share_access_maxsz \
185				(2)
186#define encode_createmode_maxsz	(1 + encode_attrs_maxsz + encode_verifier_maxsz)
187#define encode_opentype_maxsz	(1 + encode_createmode_maxsz)
188#define encode_claim_null_maxsz	(1 + nfs4_name_maxsz)
189#define encode_open_maxsz	(op_encode_hdr_maxsz + \
190				2 + encode_share_access_maxsz + 2 + \
191				open_owner_id_maxsz + \
192				encode_opentype_maxsz + \
193				encode_claim_null_maxsz)
194#define decode_space_limit_maxsz	(3)
195#define decode_ace_maxsz	(3 + nfs4_owner_maxsz)
196#define decode_delegation_maxsz	(1 + decode_stateid_maxsz + 1 + \
197				decode_space_limit_maxsz + \
198				decode_ace_maxsz)
199#define decode_change_info_maxsz	(5)
200#define decode_open_maxsz	(op_decode_hdr_maxsz + \
201				decode_stateid_maxsz + \
202				decode_change_info_maxsz + 1 + \
203				nfs4_fattr_bitmap_maxsz + \
204				decode_delegation_maxsz)
205#define encode_open_confirm_maxsz \
206				(op_encode_hdr_maxsz + \
207				 encode_stateid_maxsz + 1)
208#define decode_open_confirm_maxsz \
209				(op_decode_hdr_maxsz + \
210				 decode_stateid_maxsz)
211#define encode_open_downgrade_maxsz \
212				(op_encode_hdr_maxsz + \
213				 encode_stateid_maxsz + 1 + \
214				 encode_share_access_maxsz)
215#define decode_open_downgrade_maxsz \
216				(op_decode_hdr_maxsz + \
217				 decode_stateid_maxsz)
218#define encode_close_maxsz	(op_encode_hdr_maxsz + \
219				 1 + encode_stateid_maxsz)
220#define decode_close_maxsz	(op_decode_hdr_maxsz + \
221				 decode_stateid_maxsz)
222#define encode_setattr_maxsz	(op_encode_hdr_maxsz + \
223				 encode_stateid_maxsz + \
224				 encode_attrs_maxsz)
225#define decode_setattr_maxsz	(op_decode_hdr_maxsz + \
226				 nfs4_fattr_bitmap_maxsz)
227#define encode_read_maxsz	(op_encode_hdr_maxsz + \
228				 encode_stateid_maxsz + 3)
229#define decode_read_maxsz	(op_decode_hdr_maxsz + 2 + pagepad_maxsz)
230#define encode_readdir_maxsz	(op_encode_hdr_maxsz + \
231				 2 + encode_verifier_maxsz + 5 + \
232				nfs4_label_maxsz)
233#define decode_readdir_maxsz	(op_decode_hdr_maxsz + \
234				 decode_verifier_maxsz + pagepad_maxsz)
235#define encode_readlink_maxsz	(op_encode_hdr_maxsz)
236#define decode_readlink_maxsz	(op_decode_hdr_maxsz + 1 + pagepad_maxsz)
237#define encode_write_maxsz	(op_encode_hdr_maxsz + \
238				 encode_stateid_maxsz + 4)
239#define decode_write_maxsz	(op_decode_hdr_maxsz + \
240				 2 + decode_verifier_maxsz)
241#define encode_commit_maxsz	(op_encode_hdr_maxsz + 3)
242#define decode_commit_maxsz	(op_decode_hdr_maxsz + \
243				 decode_verifier_maxsz)
244#define encode_remove_maxsz	(op_encode_hdr_maxsz + \
245				nfs4_name_maxsz)
246#define decode_remove_maxsz	(op_decode_hdr_maxsz + \
247				 decode_change_info_maxsz)
248#define encode_rename_maxsz	(op_encode_hdr_maxsz + \
249				2 * nfs4_name_maxsz)
250#define decode_rename_maxsz	(op_decode_hdr_maxsz + \
251				 decode_change_info_maxsz + \
252				 decode_change_info_maxsz)
253#define encode_link_maxsz	(op_encode_hdr_maxsz + \
254				nfs4_name_maxsz)
255#define decode_link_maxsz	(op_decode_hdr_maxsz + decode_change_info_maxsz)
256#define encode_lockowner_maxsz	(7)
257#define encode_lock_maxsz	(op_encode_hdr_maxsz + \
258				 7 + \
259				 1 + encode_stateid_maxsz + 1 + \
260				 encode_lockowner_maxsz)
261#define decode_lock_denied_maxsz \
262				(8 + decode_lockowner_maxsz)
263#define decode_lock_maxsz	(op_decode_hdr_maxsz + \
264				 decode_lock_denied_maxsz)
265#define encode_lockt_maxsz	(op_encode_hdr_maxsz + 5 + \
266				encode_lockowner_maxsz)
267#define decode_lockt_maxsz	(op_decode_hdr_maxsz + \
268				 decode_lock_denied_maxsz)
269#define encode_locku_maxsz	(op_encode_hdr_maxsz + 3 + \
270				 encode_stateid_maxsz + \
271				 4)
272#define decode_locku_maxsz	(op_decode_hdr_maxsz + \
273				 decode_stateid_maxsz)
274#define encode_release_lockowner_maxsz \
275				(op_encode_hdr_maxsz + \
276				 encode_lockowner_maxsz)
277#define decode_release_lockowner_maxsz \
278				(op_decode_hdr_maxsz)
279#define encode_access_maxsz	(op_encode_hdr_maxsz + 1)
280#define decode_access_maxsz	(op_decode_hdr_maxsz + 2)
281#define encode_symlink_maxsz	(op_encode_hdr_maxsz + \
282				1 + nfs4_name_maxsz + \
283				1 + \
284				nfs4_fattr_maxsz)
285#define decode_symlink_maxsz	(op_decode_hdr_maxsz + 8)
286#define encode_create_maxsz	(op_encode_hdr_maxsz + \
287				1 + 2 + nfs4_name_maxsz + \
288				encode_attrs_maxsz)
289#define decode_create_maxsz	(op_decode_hdr_maxsz + \
290				decode_change_info_maxsz + \
291				nfs4_fattr_bitmap_maxsz)
292#define encode_statfs_maxsz	(encode_getattr_maxsz)
293#define decode_statfs_maxsz	(decode_getattr_maxsz)
294#define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
295#define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
296#define encode_getacl_maxsz	(encode_getattr_maxsz)
297#define decode_getacl_maxsz	(op_decode_hdr_maxsz + \
298				 nfs4_fattr_bitmap_maxsz + 1 + pagepad_maxsz)
299#define encode_setacl_maxsz	(op_encode_hdr_maxsz + \
300				 encode_stateid_maxsz + 3)
301#define decode_setacl_maxsz	(decode_setattr_maxsz)
302#define encode_fs_locations_maxsz \
303				(encode_getattr_maxsz)
304#define decode_fs_locations_maxsz \
305				(pagepad_maxsz)
306#define encode_secinfo_maxsz	(op_encode_hdr_maxsz + nfs4_name_maxsz)
307#define decode_secinfo_maxsz	(op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
308
309#if defined(CONFIG_NFS_V4_1)
310#define NFS4_MAX_MACHINE_NAME_LEN (64)
311#define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
312			 sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
313
314#define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
315				encode_verifier_maxsz + \
316				1 /* co_ownerid.len */ + \
317				/* eia_clientowner */ \
318				1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
319				1 /* flags */ + \
320				1 /* spa_how */ + \
321				/* max is SP4_MACH_CRED (for now) */ + \
322				1 + NFS4_OP_MAP_NUM_WORDS + \
323				1 + NFS4_OP_MAP_NUM_WORDS + \
324				1 /* implementation id array of size 1 */ + \
325				1 /* nii_domain */ + \
326				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
327				1 /* nii_name */ + \
328				XDR_QUADLEN(IMPL_NAME_LIMIT) + \
329				3 /* nii_date */)
330#define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
331				2 /* eir_clientid */ + \
332				1 /* eir_sequenceid */ + \
333				1 /* eir_flags */ + \
334				1 /* spr_how */ + \
335				  /* max is SP4_MACH_CRED (for now) */ + \
336				1 + NFS4_OP_MAP_NUM_WORDS + \
337				1 + NFS4_OP_MAP_NUM_WORDS + \
338				2 /* eir_server_owner.so_minor_id */ + \
339				/* eir_server_owner.so_major_id<> */ \
340				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
341				/* eir_server_scope<> */ \
342				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
343				1 /* eir_server_impl_id array length */ + \
344				1 /* nii_domain */ + \
345				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
346				1 /* nii_name */ + \
347				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
348				3 /* nii_date */)
349#define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
350#define decode_channel_attrs_maxsz  (6 + \
351				     1 /* ca_rdma_ird.len */ + \
352				     1 /* ca_rdma_ird */)
353#define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
354				     2 /* csa_clientid */ + \
355				     1 /* csa_sequence */ + \
356				     1 /* csa_flags */ + \
357				     encode_channel_attrs_maxsz + \
358				     encode_channel_attrs_maxsz + \
359				     1 /* csa_cb_program */ + \
360				     1 /* csa_sec_parms.len (1) */ + \
361				     1 /* cb_secflavor (AUTH_SYS) */ + \
362				     1 /* stamp */ + \
363				     1 /* machinename.len */ + \
364				     XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
365				     1 /* uid */ + \
366				     1 /* gid */ + \
367				     1 /* gids.len (0) */)
368#define decode_create_session_maxsz  (op_decode_hdr_maxsz +	\
369				     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
370				     1 /* csr_sequence */ + \
371				     1 /* csr_flags */ + \
372				     decode_channel_attrs_maxsz + \
373				     decode_channel_attrs_maxsz)
374#define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
375				     /* bctsa_sessid */ \
376				     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
377				     1 /* bctsa_dir */ + \
378				     1 /* bctsa_use_conn_in_rdma_mode */)
379#define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +	\
380				     /* bctsr_sessid */ \
381				     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
382				     1 /* bctsr_dir */ + \
383				     1 /* bctsr_use_conn_in_rdma_mode */)
384#define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
385#define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
386#define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
387#define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
388#define encode_sequence_maxsz	(op_encode_hdr_maxsz + \
389				XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
390#define decode_sequence_maxsz	(op_decode_hdr_maxsz + \
391				XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
392#define encode_reclaim_complete_maxsz	(op_encode_hdr_maxsz + 4)
393#define decode_reclaim_complete_maxsz	(op_decode_hdr_maxsz + 4)
394#define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
395				XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
396				1 /* layout type */ + \
397				1 /* maxcount */ + \
398				1 /* bitmap size */ + \
399				1 /* notification bitmap length */ + \
400				1 /* notification bitmap, word 0 */)
401#define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
402				1 /* layout type */ + \
403				1 /* opaque devaddr4 length */ + \
404				  /* devaddr4 payload is read into page */ \
405				1 /* notification bitmap length */ + \
406				1 /* notification bitmap, word 0 */ + \
407				pagepad_maxsz /* possible XDR padding */)
408#define encode_layoutget_maxsz	(op_encode_hdr_maxsz + 10 + \
409				encode_stateid_maxsz)
410#define decode_layoutget_maxsz	(op_decode_hdr_maxsz + 8 + \
411				decode_stateid_maxsz + \
412				XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE) + \
413				pagepad_maxsz)
414#define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
415				2 /* offset */ + \
416				2 /* length */ + \
417				1 /* reclaim */ + \
418				encode_stateid_maxsz + \
419				1 /* new offset (true) */ + \
420				2 /* last byte written */ + \
421				1 /* nt_timechanged (false) */ + \
422				1 /* layoutupdate4 layout type */ + \
423				1 /* layoutupdate4 opaqueue len */)
424				  /* the actual content of layoutupdate4 should
425				     be allocated by drivers and spliced in
426				     using xdr_write_pages */
427#define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
428#define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
429				encode_stateid_maxsz + \
430				1 + \
431				XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
432#define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
433				1 + decode_stateid_maxsz)
434#define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
435#define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
436#define encode_test_stateid_maxsz	(op_encode_hdr_maxsz + 2 + \
437					 XDR_QUADLEN(NFS4_STATEID_SIZE))
438#define decode_test_stateid_maxsz	(op_decode_hdr_maxsz + 2 + 1)
439#define encode_free_stateid_maxsz	(op_encode_hdr_maxsz + 1 + \
440					 XDR_QUADLEN(NFS4_STATEID_SIZE))
441#define decode_free_stateid_maxsz	(op_decode_hdr_maxsz)
442#else /* CONFIG_NFS_V4_1 */
443#define encode_sequence_maxsz	0
444#define decode_sequence_maxsz	0
445#define encode_layoutreturn_maxsz 0
446#define decode_layoutreturn_maxsz 0
447#define encode_layoutget_maxsz	0
448#define decode_layoutget_maxsz	0
449#endif /* CONFIG_NFS_V4_1 */
450
451#define NFS4_enc_compound_sz	(1024)  /* XXX: large enough? */
452#define NFS4_dec_compound_sz	(1024)  /* XXX: large enough? */
453#define NFS4_enc_read_sz	(compound_encode_hdr_maxsz + \
454				encode_sequence_maxsz + \
455				encode_putfh_maxsz + \
456				encode_read_maxsz)
457#define NFS4_dec_read_sz	(compound_decode_hdr_maxsz + \
458				decode_sequence_maxsz + \
459				decode_putfh_maxsz + \
460				decode_read_maxsz)
461#define NFS4_enc_readlink_sz	(compound_encode_hdr_maxsz + \
462				encode_sequence_maxsz + \
463				encode_putfh_maxsz + \
464				encode_readlink_maxsz)
465#define NFS4_dec_readlink_sz	(compound_decode_hdr_maxsz + \
466				decode_sequence_maxsz + \
467				decode_putfh_maxsz + \
468				decode_readlink_maxsz)
469#define NFS4_enc_readdir_sz	(compound_encode_hdr_maxsz + \
470				encode_sequence_maxsz + \
471				encode_putfh_maxsz + \
472				encode_readdir_maxsz)
473#define NFS4_dec_readdir_sz	(compound_decode_hdr_maxsz + \
474				decode_sequence_maxsz + \
475				decode_putfh_maxsz + \
476				decode_readdir_maxsz)
477#define NFS4_enc_write_sz	(compound_encode_hdr_maxsz + \
478				encode_sequence_maxsz + \
479				encode_putfh_maxsz + \
480				encode_write_maxsz + \
481				encode_getattr_maxsz)
482#define NFS4_dec_write_sz	(compound_decode_hdr_maxsz + \
483				decode_sequence_maxsz + \
484				decode_putfh_maxsz + \
485				decode_write_maxsz + \
486				decode_getattr_maxsz)
487#define NFS4_enc_commit_sz	(compound_encode_hdr_maxsz + \
488				encode_sequence_maxsz + \
489				encode_putfh_maxsz + \
490				encode_commit_maxsz)
491#define NFS4_dec_commit_sz	(compound_decode_hdr_maxsz + \
492				decode_sequence_maxsz + \
493				decode_putfh_maxsz + \
494				decode_commit_maxsz)
495#define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
496				encode_sequence_maxsz + \
497				encode_putfh_maxsz + \
498				encode_open_maxsz + \
499				encode_access_maxsz + \
500				encode_getfh_maxsz + \
501				encode_getattr_maxsz + \
502				encode_layoutget_maxsz)
503#define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
504				decode_sequence_maxsz + \
505				decode_putfh_maxsz + \
506				decode_open_maxsz + \
507				decode_access_maxsz + \
508				decode_getfh_maxsz + \
509				decode_getattr_maxsz + \
510				decode_layoutget_maxsz)
511#define NFS4_enc_open_confirm_sz \
512				(compound_encode_hdr_maxsz + \
513				 encode_putfh_maxsz + \
514				 encode_open_confirm_maxsz)
515#define NFS4_dec_open_confirm_sz \
516				(compound_decode_hdr_maxsz + \
517				 decode_putfh_maxsz + \
518				 decode_open_confirm_maxsz)
519#define NFS4_enc_open_noattr_sz	(compound_encode_hdr_maxsz + \
520					encode_sequence_maxsz + \
521					encode_putfh_maxsz + \
522					encode_open_maxsz + \
523					encode_access_maxsz + \
524					encode_getattr_maxsz + \
525					encode_layoutget_maxsz)
526#define NFS4_dec_open_noattr_sz	(compound_decode_hdr_maxsz + \
527					decode_sequence_maxsz + \
528					decode_putfh_maxsz + \
529					decode_open_maxsz + \
530					decode_access_maxsz + \
531					decode_getattr_maxsz + \
532					decode_layoutget_maxsz)
533#define NFS4_enc_open_downgrade_sz \
534				(compound_encode_hdr_maxsz + \
535				 encode_sequence_maxsz + \
536				 encode_putfh_maxsz + \
537				 encode_layoutreturn_maxsz + \
538				 encode_open_downgrade_maxsz)
539#define NFS4_dec_open_downgrade_sz \
540				(compound_decode_hdr_maxsz + \
541				 decode_sequence_maxsz + \
542				 decode_putfh_maxsz + \
543				 decode_layoutreturn_maxsz + \
544				 decode_open_downgrade_maxsz)
545#define NFS4_enc_close_sz	(compound_encode_hdr_maxsz + \
546				 encode_sequence_maxsz + \
547				 encode_putfh_maxsz + \
548				 encode_layoutreturn_maxsz + \
549				 encode_close_maxsz + \
550				 encode_getattr_maxsz)
551#define NFS4_dec_close_sz	(compound_decode_hdr_maxsz + \
552				 decode_sequence_maxsz + \
553				 decode_putfh_maxsz + \
554				 decode_layoutreturn_maxsz + \
555				 decode_close_maxsz + \
556				 decode_getattr_maxsz)
557#define NFS4_enc_setattr_sz	(compound_encode_hdr_maxsz + \
558				 encode_sequence_maxsz + \
559				 encode_putfh_maxsz + \
560				 encode_setattr_maxsz + \
561				 encode_getattr_maxsz)
562#define NFS4_dec_setattr_sz	(compound_decode_hdr_maxsz + \
563				 decode_sequence_maxsz + \
564				 decode_putfh_maxsz + \
565				 decode_setattr_maxsz + \
566				 decode_getattr_maxsz)
567#define NFS4_enc_fsinfo_sz	(compound_encode_hdr_maxsz + \
568				encode_sequence_maxsz + \
569				encode_putfh_maxsz + \
570				encode_fsinfo_maxsz)
571#define NFS4_dec_fsinfo_sz	(compound_decode_hdr_maxsz + \
572				decode_sequence_maxsz + \
573				decode_putfh_maxsz + \
574				decode_fsinfo_maxsz)
575#define NFS4_enc_renew_sz	(compound_encode_hdr_maxsz + \
576				encode_renew_maxsz)
577#define NFS4_dec_renew_sz	(compound_decode_hdr_maxsz + \
578				decode_renew_maxsz)
579#define NFS4_enc_setclientid_sz	(compound_encode_hdr_maxsz + \
580				encode_setclientid_maxsz)
581#define NFS4_dec_setclientid_sz	(compound_decode_hdr_maxsz + \
582				decode_setclientid_maxsz)
583#define NFS4_enc_setclientid_confirm_sz \
584				(compound_encode_hdr_maxsz + \
585				encode_setclientid_confirm_maxsz)
586#define NFS4_dec_setclientid_confirm_sz \
587				(compound_decode_hdr_maxsz + \
588				decode_setclientid_confirm_maxsz)
589#define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
590				encode_sequence_maxsz + \
591				encode_putfh_maxsz + \
592				encode_lock_maxsz)
593#define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
594				decode_sequence_maxsz + \
595				decode_putfh_maxsz + \
596				decode_lock_maxsz)
597#define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
598				encode_sequence_maxsz + \
599				encode_putfh_maxsz + \
600				encode_lockt_maxsz)
601#define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
602				 decode_sequence_maxsz + \
603				 decode_putfh_maxsz + \
604				 decode_lockt_maxsz)
605#define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
606				encode_sequence_maxsz + \
607				encode_putfh_maxsz + \
608				encode_locku_maxsz)
609#define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
610				decode_sequence_maxsz + \
611				decode_putfh_maxsz + \
612				decode_locku_maxsz)
613#define NFS4_enc_release_lockowner_sz \
614				(compound_encode_hdr_maxsz + \
615				 encode_lockowner_maxsz)
616#define NFS4_dec_release_lockowner_sz \
617				(compound_decode_hdr_maxsz + \
618				 decode_lockowner_maxsz)
619#define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
620				encode_sequence_maxsz + \
621				encode_putfh_maxsz + \
622				encode_access_maxsz + \
623				encode_getattr_maxsz)
624#define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
625				decode_sequence_maxsz + \
626				decode_putfh_maxsz + \
627				decode_access_maxsz + \
628				decode_getattr_maxsz)
629#define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
630				encode_sequence_maxsz + \
631				encode_putfh_maxsz + \
632				encode_getattr_maxsz + \
633				encode_renew_maxsz)
634#define NFS4_dec_getattr_sz	(compound_decode_hdr_maxsz + \
635				decode_sequence_maxsz + \
636				decode_putfh_maxsz + \
637				decode_getattr_maxsz + \
638				decode_renew_maxsz)
639#define NFS4_enc_lookup_sz	(compound_encode_hdr_maxsz + \
640				encode_sequence_maxsz + \
641				encode_putfh_maxsz + \
642				encode_lookup_maxsz + \
643				encode_getattr_maxsz + \
644				encode_getfh_maxsz)
645#define NFS4_dec_lookup_sz	(compound_decode_hdr_maxsz + \
646				decode_sequence_maxsz + \
647				decode_putfh_maxsz + \
648				decode_lookup_maxsz + \
649				decode_getattr_maxsz + \
650				decode_getfh_maxsz)
651#define NFS4_enc_lookupp_sz	(compound_encode_hdr_maxsz + \
652				encode_sequence_maxsz + \
653				encode_putfh_maxsz + \
654				encode_lookupp_maxsz + \
655				encode_getattr_maxsz + \
656				encode_getfh_maxsz)
657#define NFS4_dec_lookupp_sz	(compound_decode_hdr_maxsz + \
658				decode_sequence_maxsz + \
659				decode_putfh_maxsz + \
660				decode_lookupp_maxsz + \
661				decode_getattr_maxsz + \
662				decode_getfh_maxsz)
663#define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
664				encode_sequence_maxsz + \
665				encode_putrootfh_maxsz + \
666				encode_getattr_maxsz + \
667				encode_getfh_maxsz)
668#define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
669				decode_sequence_maxsz + \
670				decode_putrootfh_maxsz + \
671				decode_getattr_maxsz + \
672				decode_getfh_maxsz)
673#define NFS4_enc_remove_sz	(compound_encode_hdr_maxsz + \
674				encode_sequence_maxsz + \
675				encode_putfh_maxsz + \
676				encode_remove_maxsz)
677#define NFS4_dec_remove_sz	(compound_decode_hdr_maxsz + \
678				decode_sequence_maxsz + \
679				decode_putfh_maxsz + \
680				decode_remove_maxsz)
681#define NFS4_enc_rename_sz	(compound_encode_hdr_maxsz + \
682				encode_sequence_maxsz + \
683				encode_putfh_maxsz + \
684				encode_savefh_maxsz + \
685				encode_putfh_maxsz + \
686				encode_rename_maxsz)
687#define NFS4_dec_rename_sz	(compound_decode_hdr_maxsz + \
688				decode_sequence_maxsz + \
689				decode_putfh_maxsz + \
690				decode_savefh_maxsz + \
691				decode_putfh_maxsz + \
692				decode_rename_maxsz)
693#define NFS4_enc_link_sz	(compound_encode_hdr_maxsz + \
694				encode_sequence_maxsz + \
695				encode_putfh_maxsz + \
696				encode_savefh_maxsz + \
697				encode_putfh_maxsz + \
698				encode_link_maxsz + \
699				encode_restorefh_maxsz + \
700				encode_getattr_maxsz)
701#define NFS4_dec_link_sz	(compound_decode_hdr_maxsz + \
702				decode_sequence_maxsz + \
703				decode_putfh_maxsz + \
704				decode_savefh_maxsz + \
705				decode_putfh_maxsz + \
706				decode_link_maxsz + \
707				decode_restorefh_maxsz + \
708				decode_getattr_maxsz)
709#define NFS4_enc_symlink_sz	(compound_encode_hdr_maxsz + \
710				encode_sequence_maxsz + \
711				encode_putfh_maxsz + \
712				encode_symlink_maxsz + \
713				encode_getattr_maxsz + \
714				encode_getfh_maxsz)
715#define NFS4_dec_symlink_sz	(compound_decode_hdr_maxsz + \
716				decode_sequence_maxsz + \
717				decode_putfh_maxsz + \
718				decode_symlink_maxsz + \
719				decode_getattr_maxsz + \
720				decode_getfh_maxsz)
721#define NFS4_enc_create_sz	(compound_encode_hdr_maxsz + \
722				encode_sequence_maxsz + \
723				encode_putfh_maxsz + \
724				encode_create_maxsz + \
725				encode_getfh_maxsz + \
726				encode_getattr_maxsz)
727#define NFS4_dec_create_sz	(compound_decode_hdr_maxsz + \
728				decode_sequence_maxsz + \
729				decode_putfh_maxsz + \
730				decode_create_maxsz + \
731				decode_getfh_maxsz + \
732				decode_getattr_maxsz)
733#define NFS4_enc_pathconf_sz	(compound_encode_hdr_maxsz + \
734				encode_sequence_maxsz + \
735				encode_putfh_maxsz + \
736				encode_getattr_maxsz)
737#define NFS4_dec_pathconf_sz	(compound_decode_hdr_maxsz + \
738				decode_sequence_maxsz + \
739				decode_putfh_maxsz + \
740				decode_getattr_maxsz)
741#define NFS4_enc_statfs_sz	(compound_encode_hdr_maxsz + \
742				encode_sequence_maxsz + \
743				encode_putfh_maxsz + \
744				encode_statfs_maxsz)
745#define NFS4_dec_statfs_sz	(compound_decode_hdr_maxsz + \
746				decode_sequence_maxsz + \
747				decode_putfh_maxsz + \
748				decode_statfs_maxsz)
749#define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
750				encode_sequence_maxsz + \
751				encode_putfh_maxsz + \
752				encode_getattr_maxsz)
753#define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
754				decode_sequence_maxsz + \
755				decode_putfh_maxsz + \
756				decode_getattr_maxsz)
757#define NFS4_enc_delegreturn_sz	(compound_encode_hdr_maxsz + \
758				encode_sequence_maxsz + \
759				encode_putfh_maxsz + \
760				encode_layoutreturn_maxsz + \
761				encode_delegreturn_maxsz + \
762				encode_getattr_maxsz)
763#define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
764				decode_sequence_maxsz + \
765				decode_putfh_maxsz + \
766				decode_layoutreturn_maxsz + \
767				decode_delegreturn_maxsz + \
768				decode_getattr_maxsz)
769#define NFS4_enc_getacl_sz	(compound_encode_hdr_maxsz + \
770				encode_sequence_maxsz + \
771				encode_putfh_maxsz + \
772				encode_getacl_maxsz)
773#define NFS4_dec_getacl_sz	(compound_decode_hdr_maxsz + \
774				decode_sequence_maxsz + \
775				decode_putfh_maxsz + \
776				decode_getacl_maxsz)
777#define NFS4_enc_setacl_sz	(compound_encode_hdr_maxsz + \
778				encode_sequence_maxsz + \
779				encode_putfh_maxsz + \
780				encode_setacl_maxsz)
781#define NFS4_dec_setacl_sz	(compound_decode_hdr_maxsz + \
782				decode_sequence_maxsz + \
783				decode_putfh_maxsz + \
784				decode_setacl_maxsz)
785#define NFS4_enc_fs_locations_sz \
786				(compound_encode_hdr_maxsz + \
787				 encode_sequence_maxsz + \
788				 encode_putfh_maxsz + \
789				 encode_lookup_maxsz + \
790				 encode_fs_locations_maxsz + \
791				 encode_renew_maxsz)
792#define NFS4_dec_fs_locations_sz \
793				(compound_decode_hdr_maxsz + \
794				 decode_sequence_maxsz + \
795				 decode_putfh_maxsz + \
796				 decode_lookup_maxsz + \
797				 decode_fs_locations_maxsz + \
798				 decode_renew_maxsz)
799#define NFS4_enc_secinfo_sz 	(compound_encode_hdr_maxsz + \
800				encode_sequence_maxsz + \
801				encode_putfh_maxsz + \
802				encode_secinfo_maxsz)
803#define NFS4_dec_secinfo_sz	(compound_decode_hdr_maxsz + \
804				decode_sequence_maxsz + \
805				decode_putfh_maxsz + \
806				decode_secinfo_maxsz)
807#define NFS4_enc_fsid_present_sz \
808				(compound_encode_hdr_maxsz + \
809				 encode_sequence_maxsz + \
810				 encode_putfh_maxsz + \
811				 encode_getfh_maxsz + \
812				 encode_renew_maxsz)
813#define NFS4_dec_fsid_present_sz \
814				(compound_decode_hdr_maxsz + \
815				 decode_sequence_maxsz + \
816				 decode_putfh_maxsz + \
817				 decode_getfh_maxsz + \
818				 decode_renew_maxsz)
819#if defined(CONFIG_NFS_V4_1)
820#define NFS4_enc_bind_conn_to_session_sz \
821				(compound_encode_hdr_maxsz + \
822				 encode_bind_conn_to_session_maxsz)
823#define NFS4_dec_bind_conn_to_session_sz \
824				(compound_decode_hdr_maxsz + \
825				 decode_bind_conn_to_session_maxsz)
826#define NFS4_enc_exchange_id_sz \
827				(compound_encode_hdr_maxsz + \
828				 encode_exchange_id_maxsz)
829#define NFS4_dec_exchange_id_sz \
830				(compound_decode_hdr_maxsz + \
831				 decode_exchange_id_maxsz)
832#define NFS4_enc_create_session_sz \
833				(compound_encode_hdr_maxsz + \
834				 encode_create_session_maxsz)
835#define NFS4_dec_create_session_sz \
836				(compound_decode_hdr_maxsz + \
837				 decode_create_session_maxsz)
838#define NFS4_enc_destroy_session_sz	(compound_encode_hdr_maxsz + \
839					 encode_destroy_session_maxsz)
840#define NFS4_dec_destroy_session_sz	(compound_decode_hdr_maxsz + \
841					 decode_destroy_session_maxsz)
842#define NFS4_enc_destroy_clientid_sz	(compound_encode_hdr_maxsz + \
843					 encode_destroy_clientid_maxsz)
844#define NFS4_dec_destroy_clientid_sz	(compound_decode_hdr_maxsz + \
845					 decode_destroy_clientid_maxsz)
846#define NFS4_enc_sequence_sz \
847				(compound_decode_hdr_maxsz + \
848				 encode_sequence_maxsz)
849#define NFS4_dec_sequence_sz \
850				(compound_decode_hdr_maxsz + \
851				 decode_sequence_maxsz)
852#endif
853#define NFS4_enc_get_lease_time_sz	(compound_encode_hdr_maxsz + \
854					 encode_sequence_maxsz + \
855					 encode_putrootfh_maxsz + \
856					 encode_fsinfo_maxsz)
857#define NFS4_dec_get_lease_time_sz	(compound_decode_hdr_maxsz + \
858					 decode_sequence_maxsz + \
859					 decode_putrootfh_maxsz + \
860					 decode_fsinfo_maxsz)
861#if defined(CONFIG_NFS_V4_1)
862#define NFS4_enc_reclaim_complete_sz	(compound_encode_hdr_maxsz + \
863					 encode_sequence_maxsz + \
864					 encode_reclaim_complete_maxsz)
865#define NFS4_dec_reclaim_complete_sz	(compound_decode_hdr_maxsz + \
866					 decode_sequence_maxsz + \
867					 decode_reclaim_complete_maxsz)
868#define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
869				encode_sequence_maxsz +\
870				encode_getdeviceinfo_maxsz)
871#define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
872				decode_sequence_maxsz + \
873				decode_getdeviceinfo_maxsz)
874#define NFS4_enc_layoutget_sz	(compound_encode_hdr_maxsz + \
875				encode_sequence_maxsz + \
876				encode_putfh_maxsz +        \
877				encode_layoutget_maxsz)
878#define NFS4_dec_layoutget_sz	(compound_decode_hdr_maxsz + \
879				decode_sequence_maxsz + \
880				decode_putfh_maxsz +        \
881				decode_layoutget_maxsz)
882#define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
883				encode_sequence_maxsz +\
884				encode_putfh_maxsz + \
885				encode_layoutcommit_maxsz + \
886				encode_getattr_maxsz)
887#define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
888				decode_sequence_maxsz + \
889				decode_putfh_maxsz + \
890				decode_layoutcommit_maxsz + \
891				decode_getattr_maxsz)
892#define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
893				encode_sequence_maxsz + \
894				encode_putfh_maxsz + \
895				encode_layoutreturn_maxsz)
896#define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
897				decode_sequence_maxsz + \
898				decode_putfh_maxsz + \
899				decode_layoutreturn_maxsz)
900#define NFS4_enc_secinfo_no_name_sz	(compound_encode_hdr_maxsz + \
901					encode_sequence_maxsz + \
902					encode_putrootfh_maxsz +\
903					encode_secinfo_no_name_maxsz)
904#define NFS4_dec_secinfo_no_name_sz	(compound_decode_hdr_maxsz + \
905					decode_sequence_maxsz + \
906					decode_putrootfh_maxsz + \
907					decode_secinfo_no_name_maxsz)
908#define NFS4_enc_test_stateid_sz	(compound_encode_hdr_maxsz + \
909					 encode_sequence_maxsz + \
910					 encode_test_stateid_maxsz)
911#define NFS4_dec_test_stateid_sz	(compound_decode_hdr_maxsz + \
912					 decode_sequence_maxsz + \
913					 decode_test_stateid_maxsz)
914#define NFS4_enc_free_stateid_sz	(compound_encode_hdr_maxsz + \
915					 encode_sequence_maxsz + \
916					 encode_free_stateid_maxsz)
917#define NFS4_dec_free_stateid_sz	(compound_decode_hdr_maxsz + \
918					 decode_sequence_maxsz + \
919					 decode_free_stateid_maxsz)
920
921const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
922				      compound_encode_hdr_maxsz +
923				      encode_sequence_maxsz +
924				      encode_putfh_maxsz +
925				      encode_getattr_maxsz) *
926				     XDR_UNIT);
927
928const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
929				     compound_decode_hdr_maxsz +
930				     decode_sequence_maxsz +
931				     decode_putfh_maxsz) *
932				    XDR_UNIT);
933
934const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
935					   compound_decode_hdr_maxsz +
936					   decode_sequence_maxsz) *
937					  XDR_UNIT);
938EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
939#endif /* CONFIG_NFS_V4_1 */
940
941static const umode_t nfs_type2fmt[] = {
942	[NF4BAD] = 0,
943	[NF4REG] = S_IFREG,
944	[NF4DIR] = S_IFDIR,
945	[NF4BLK] = S_IFBLK,
946	[NF4CHR] = S_IFCHR,
947	[NF4LNK] = S_IFLNK,
948	[NF4SOCK] = S_IFSOCK,
949	[NF4FIFO] = S_IFIFO,
950	[NF4ATTRDIR] = 0,
951	[NF4NAMEDATTR] = 0,
952};
953
954struct compound_hdr {
955	int32_t		status;
956	uint32_t	nops;
957	__be32 *	nops_p;
958	uint32_t	taglen;
959	char *		tag;
960	uint32_t	replen;		/* expected reply words */
961	u32		minorversion;
962};
963
964static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
965{
966	__be32 *p = xdr_reserve_space(xdr, nbytes);
967	BUG_ON(!p);
968	return p;
969}
970
971static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
972{
973	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
974}
975
976static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
977{
978	WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
979}
980
981static void encode_uint32(struct xdr_stream *xdr, u32 n)
982{
983	WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
984}
985
986static void encode_uint64(struct xdr_stream *xdr, u64 n)
987{
988	WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
989}
990
991static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
992		const __u32 *bitmap, size_t len)
993{
994	ssize_t ret;
995
996	/* Trim empty words */
997	while (len > 0 && bitmap[len-1] == 0)
998		len--;
999	ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
1000	if (WARN_ON_ONCE(ret < 0))
1001		return ret;
1002	return len;
1003}
1004
1005static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
1006		__u32 *res, size_t len)
1007{
1008	size_t i;
1009	__u32 tmp;
1010
1011	while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
1012		len--;
1013	for (i = len; i-- > 0;) {
1014		tmp = bitmap[i] & mask[i];
1015		res[i] = tmp;
1016	}
1017	return len;
1018}
1019
1020static void encode_nfs4_seqid(struct xdr_stream *xdr,
1021		const struct nfs_seqid *seqid)
1022{
1023	if (seqid != NULL)
1024		encode_uint32(xdr, seqid->sequence->counter);
1025	else
1026		encode_uint32(xdr, 0);
1027}
1028
1029static void encode_compound_hdr(struct xdr_stream *xdr,
1030				struct rpc_rqst *req,
1031				struct compound_hdr *hdr)
1032{
1033	__be32 *p;
1034
1035	/* initialize running count of expected bytes in reply.
1036	 * NOTE: the replied tag SHOULD be the same is the one sent,
1037	 * but this is not required as a MUST for the server to do so. */
1038	hdr->replen = 3 + hdr->taglen;
1039
1040	WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
1041	encode_string(xdr, hdr->taglen, hdr->tag);
1042	p = reserve_space(xdr, 8);
1043	*p++ = cpu_to_be32(hdr->minorversion);
1044	hdr->nops_p = p;
1045	*p = cpu_to_be32(hdr->nops);
1046}
1047
1048static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
1049		uint32_t replen,
1050		struct compound_hdr *hdr)
1051{
1052	encode_uint32(xdr, op);
1053	hdr->nops++;
1054	hdr->replen += replen;
1055}
1056
1057static void encode_nops(struct compound_hdr *hdr)
1058{
1059	WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
1060	*hdr->nops_p = htonl(hdr->nops);
1061}
1062
1063static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1064{
1065	encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
1066}
1067
1068static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
1069{
1070	encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1071}
1072
1073static __be32 *
1074xdr_encode_nfstime4(__be32 *p, const struct timespec64 *t)
1075{
1076	p = xdr_encode_hyper(p, t->tv_sec);
1077	*p++ = cpu_to_be32(t->tv_nsec);
1078	return p;
1079}
1080
1081static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1082				const struct nfs4_label *label,
1083				const umode_t *umask,
1084				const struct nfs_server *server,
1085				const uint32_t attrmask[])
1086{
1087	char owner_name[IDMAP_NAMESZ];
1088	char owner_group[IDMAP_NAMESZ];
1089	int owner_namelen = 0;
1090	int owner_grouplen = 0;
1091	__be32 *p;
1092	uint32_t len = 0;
1093	uint32_t bmval[3] = { 0 };
1094
1095	/*
1096	 * We reserve enough space to write the entire attribute buffer at once.
1097	 */
1098	if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) {
1099		bmval[0] |= FATTR4_WORD0_SIZE;
1100		len += 8;
1101	}
1102	if (iap->ia_valid & ATTR_MODE) {
1103		if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) {
1104			bmval[2] |= FATTR4_WORD2_MODE_UMASK;
1105			len += 8;
1106		} else if (attrmask[1] & FATTR4_WORD1_MODE) {
1107			bmval[1] |= FATTR4_WORD1_MODE;
1108			len += 4;
1109		}
1110	}
1111	if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) {
1112		owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1113		if (owner_namelen < 0) {
1114			dprintk("nfs: couldn't resolve uid %d to string\n",
1115					from_kuid(&init_user_ns, iap->ia_uid));
1116			/* XXX */
1117			strcpy(owner_name, "nobody");
1118			owner_namelen = sizeof("nobody") - 1;
1119			/* goto out; */
1120		}
1121		bmval[1] |= FATTR4_WORD1_OWNER;
1122		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1123	}
1124	if ((iap->ia_valid & ATTR_GID) &&
1125	   (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) {
1126		owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1127		if (owner_grouplen < 0) {
1128			dprintk("nfs: couldn't resolve gid %d to string\n",
1129					from_kgid(&init_user_ns, iap->ia_gid));
1130			strcpy(owner_group, "nobody");
1131			owner_grouplen = sizeof("nobody") - 1;
1132			/* goto out; */
1133		}
1134		bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1135		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1136	}
1137	if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1138		if (iap->ia_valid & ATTR_ATIME_SET) {
1139			bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1140			len += 4 + (nfstime4_maxsz << 2);
1141		} else if (iap->ia_valid & ATTR_ATIME) {
1142			bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1143			len += 4;
1144		}
1145	}
1146	if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1147		if (iap->ia_valid & ATTR_MTIME_SET) {
1148			bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1149			len += 4 + (nfstime4_maxsz << 2);
1150		} else if (iap->ia_valid & ATTR_MTIME) {
1151			bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1152			len += 4;
1153		}
1154	}
1155
1156	if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1157		len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1158		bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1159	}
1160
1161	xdr_encode_bitmap4(xdr, bmval, ARRAY_SIZE(bmval));
1162	xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);
1163
1164	if (bmval[0] & FATTR4_WORD0_SIZE)
1165		p = xdr_encode_hyper(p, iap->ia_size);
1166	if (bmval[1] & FATTR4_WORD1_MODE)
1167		*p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1168	if (bmval[1] & FATTR4_WORD1_OWNER)
1169		p = xdr_encode_opaque(p, owner_name, owner_namelen);
1170	if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1171		p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1172	if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1173		if (iap->ia_valid & ATTR_ATIME_SET) {
1174			*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1175			p = xdr_encode_nfstime4(p, &iap->ia_atime);
1176		} else
1177			*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1178	}
1179	if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1180		if (iap->ia_valid & ATTR_MTIME_SET) {
1181			*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1182			p = xdr_encode_nfstime4(p, &iap->ia_mtime);
1183		} else
1184			*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1185	}
1186	if (label && (bmval[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1187		*p++ = cpu_to_be32(label->lfs);
1188		*p++ = cpu_to_be32(label->pi);
1189		*p++ = cpu_to_be32(label->len);
1190		p = xdr_encode_opaque_fixed(p, label->label, label->len);
1191	}
1192	if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
1193		*p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1194		*p++ = cpu_to_be32(*umask);
1195	}
1196
1197/* out: */
1198}
1199
1200static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1201{
1202	encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1203	encode_uint32(xdr, access);
1204}
1205
1206static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1207{
1208	encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1209	encode_nfs4_seqid(xdr, arg->seqid);
1210	encode_nfs4_stateid(xdr, &arg->stateid);
1211}
1212
1213static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1214{
1215	__be32 *p;
1216
1217	encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1218	p = reserve_space(xdr, 12);
1219	p = xdr_encode_hyper(p, args->offset);
1220	*p = cpu_to_be32(args->count);
1221}
1222
1223static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1224{
1225	__be32 *p;
1226
1227	encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1228	encode_uint32(xdr, create->ftype);
1229
1230	switch (create->ftype) {
1231	case NF4LNK:
1232		p = reserve_space(xdr, 4);
1233		*p = cpu_to_be32(create->u.symlink.len);
1234		xdr_write_pages(xdr, create->u.symlink.pages, 0,
1235				create->u.symlink.len);
1236		xdr->buf->flags |= XDRBUF_WRITE;
1237		break;
1238
1239	case NF4BLK: case NF4CHR:
1240		p = reserve_space(xdr, 8);
1241		*p++ = cpu_to_be32(create->u.device.specdata1);
1242		*p = cpu_to_be32(create->u.device.specdata2);
1243		break;
1244
1245	default:
1246		break;
1247	}
1248
1249	encode_string(xdr, create->name->len, create->name->name);
1250	encode_attrs(xdr, create->attrs, create->label, &create->umask,
1251			create->server, create->server->attr_bitmask);
1252}
1253
1254static void encode_getattr(struct xdr_stream *xdr,
1255		const __u32 *bitmap, const __u32 *mask, size_t len,
1256		struct compound_hdr *hdr)
1257{
1258	__u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];
1259
1260	encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1261	if (mask) {
1262		if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
1263			len = ARRAY_SIZE(masked_bitmap);
1264		len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
1265		bitmap = masked_bitmap;
1266	}
1267	xdr_encode_bitmap4(xdr, bitmap, len);
1268}
1269
1270static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1271{
1272	encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
1273			ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
1274}
1275
1276static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1277				 const u32 *open_bitmap,
1278				 struct compound_hdr *hdr)
1279{
1280	encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
1281}
1282
1283static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1284{
1285	encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
1286			ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
1287}
1288
1289static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1290{
1291	encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
1292			ARRAY_SIZE(nfs4_fs_locations_bitmap), hdr);
1293}
1294
1295static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1296{
1297	encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1298}
1299
1300static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1301{
1302	encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1303	encode_string(xdr, name->len, name->name);
1304}
1305
1306static inline int nfs4_lock_type(struct file_lock *fl, int block)
1307{
1308	if (lock_is_read(fl))
1309		return block ? NFS4_READW_LT : NFS4_READ_LT;
1310	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1311}
1312
1313static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1314{
1315	if (fl->fl_end == OFFSET_MAX)
1316		return ~(uint64_t)0;
1317	return fl->fl_end - fl->fl_start + 1;
1318}
1319
1320static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1321{
1322	__be32 *p;
1323
1324	p = reserve_space(xdr, 32);
1325	p = xdr_encode_hyper(p, lowner->clientid);
1326	*p++ = cpu_to_be32(20);
1327	p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1328	*p++ = cpu_to_be32(lowner->s_dev);
1329	xdr_encode_hyper(p, lowner->id);
1330}
1331
1332/*
1333 * opcode,type,reclaim,offset,length,new_lock_owner = 32
1334 * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1335 */
1336static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1337{
1338	__be32 *p;
1339
1340	encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1341	p = reserve_space(xdr, 28);
1342	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1343	*p++ = cpu_to_be32(args->reclaim);
1344	p = xdr_encode_hyper(p, args->fl->fl_start);
1345	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1346	*p = cpu_to_be32(args->new_lock_owner);
1347	if (args->new_lock_owner){
1348		encode_nfs4_seqid(xdr, args->open_seqid);
1349		encode_nfs4_stateid(xdr, &args->open_stateid);
1350		encode_nfs4_seqid(xdr, args->lock_seqid);
1351		encode_lockowner(xdr, &args->lock_owner);
1352	}
1353	else {
1354		encode_nfs4_stateid(xdr, &args->lock_stateid);
1355		encode_nfs4_seqid(xdr, args->lock_seqid);
1356	}
1357}
1358
1359static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1360{
1361	__be32 *p;
1362
1363	encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1364	p = reserve_space(xdr, 20);
1365	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1366	p = xdr_encode_hyper(p, args->fl->fl_start);
1367	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1368	encode_lockowner(xdr, &args->lock_owner);
1369}
1370
1371static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1372{
1373	__be32 *p;
1374
1375	encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1376	encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1377	encode_nfs4_seqid(xdr, args->seqid);
1378	encode_nfs4_stateid(xdr, &args->stateid);
1379	p = reserve_space(xdr, 16);
1380	p = xdr_encode_hyper(p, args->fl->fl_start);
1381	xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1382}
1383
1384static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1385{
1386	encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1387	encode_lockowner(xdr, lowner);
1388}
1389
1390static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1391{
1392	encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1393	encode_string(xdr, name->len, name->name);
1394}
1395
1396static void encode_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
1397{
1398	encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
1399}
1400
1401static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1402{
1403	__be32 *p;
1404
1405	p = reserve_space(xdr, 8);
1406	*p++ = cpu_to_be32(share_access);
1407	*p = cpu_to_be32(0);		/* for linux, share_deny = 0 always */
1408}
1409
1410static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1411{
1412	__be32 *p;
1413 /*
1414 * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1415 * owner 4 = 32
1416 */
1417	encode_nfs4_seqid(xdr, arg->seqid);
1418	encode_share_access(xdr, arg->share_access);
1419	p = reserve_space(xdr, 36);
1420	p = xdr_encode_hyper(p, arg->clientid);
1421	*p++ = cpu_to_be32(24);
1422	p = xdr_encode_opaque_fixed(p, "open id:", 8);
1423	*p++ = cpu_to_be32(arg->server->s_dev);
1424	*p++ = cpu_to_be32(arg->id.uniquifier);
1425	xdr_encode_hyper(p, arg->id.create_time);
1426}
1427
1428static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1429{
1430	__be32 *p;
1431
1432	p = reserve_space(xdr, 4);
1433	switch(arg->createmode) {
1434	case NFS4_CREATE_UNCHECKED:
1435		*p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1436		encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1437				arg->server, arg->server->attr_bitmask);
1438		break;
1439	case NFS4_CREATE_GUARDED:
1440		*p = cpu_to_be32(NFS4_CREATE_GUARDED);
1441		encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1442				arg->server, arg->server->attr_bitmask);
1443		break;
1444	case NFS4_CREATE_EXCLUSIVE:
1445		*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1446		encode_nfs4_verifier(xdr, &arg->u.verifier);
1447		break;
1448	case NFS4_CREATE_EXCLUSIVE4_1:
1449		*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1450		encode_nfs4_verifier(xdr, &arg->u.verifier);
1451		encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1452				arg->server, arg->server->exclcreat_bitmask);
1453	}
1454}
1455
1456static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1457{
1458	__be32 *p;
1459
1460	p = reserve_space(xdr, 4);
1461	switch (arg->open_flags & O_CREAT) {
1462	case 0:
1463		*p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1464		break;
1465	default:
1466		*p = cpu_to_be32(NFS4_OPEN_CREATE);
1467		encode_createmode(xdr, arg);
1468	}
1469}
1470
1471static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1472{
1473	__be32 *p;
1474
1475	p = reserve_space(xdr, 4);
1476	switch (delegation_type) {
1477	case 0:
1478		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1479		break;
1480	case FMODE_READ:
1481		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1482		break;
1483	case FMODE_WRITE|FMODE_READ:
1484		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1485		break;
1486	default:
1487		BUG();
1488	}
1489}
1490
1491static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1492{
1493	__be32 *p;
1494
1495	p = reserve_space(xdr, 4);
1496	*p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1497	encode_string(xdr, name->len, name->name);
1498}
1499
1500static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1501{
1502	__be32 *p;
1503
1504	p = reserve_space(xdr, 4);
1505	*p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1506	encode_delegation_type(xdr, type);
1507}
1508
1509static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1510{
1511	__be32 *p;
1512
1513	p = reserve_space(xdr, 4);
1514	*p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1515	encode_nfs4_stateid(xdr, stateid);
1516	encode_string(xdr, name->len, name->name);
1517}
1518
1519static inline void encode_claim_fh(struct xdr_stream *xdr)
1520{
1521	__be32 *p;
1522
1523	p = reserve_space(xdr, 4);
1524	*p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1525}
1526
1527static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1528{
1529	__be32 *p;
1530
1531	p = reserve_space(xdr, 4);
1532	*p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1533	encode_nfs4_stateid(xdr, stateid);
1534}
1535
1536static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1537{
1538	encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1539	encode_openhdr(xdr, arg);
1540	encode_opentype(xdr, arg);
1541	switch (arg->claim) {
1542	case NFS4_OPEN_CLAIM_NULL:
1543		encode_claim_null(xdr, arg->name);
1544		break;
1545	case NFS4_OPEN_CLAIM_PREVIOUS:
1546		encode_claim_previous(xdr, arg->u.delegation_type);
1547		break;
1548	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1549		encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1550		break;
1551	case NFS4_OPEN_CLAIM_FH:
1552		encode_claim_fh(xdr);
1553		break;
1554	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1555		encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1556		break;
1557	default:
1558		BUG();
1559	}
1560}
1561
1562static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1563{
1564	encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1565	encode_nfs4_stateid(xdr, arg->stateid);
1566	encode_nfs4_seqid(xdr, arg->seqid);
1567}
1568
1569static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1570{
1571	encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1572	encode_nfs4_stateid(xdr, &arg->stateid);
1573	encode_nfs4_seqid(xdr, arg->seqid);
1574	encode_share_access(xdr, arg->share_access);
1575}
1576
1577static void
1578encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1579{
1580	encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1581	encode_string(xdr, fh->size, fh->data);
1582}
1583
1584static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1585{
1586	encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1587}
1588
1589static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1590			struct compound_hdr *hdr)
1591{
1592	__be32 *p;
1593
1594	encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1595	encode_nfs4_stateid(xdr, &args->stateid);
1596
1597	p = reserve_space(xdr, 12);
1598	p = xdr_encode_hyper(p, args->offset);
1599	*p = cpu_to_be32(args->count);
1600}
1601
1602static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1603{
1604	uint32_t attrs[3] = {
1605		FATTR4_WORD0_TYPE
1606		| FATTR4_WORD0_RDATTR_ERROR,
1607		FATTR4_WORD1_MOUNTED_ON_FILEID,
1608	};
1609	uint32_t dircount = readdir->count;
1610	uint32_t maxcount = readdir->count;
1611	__be32 *p, verf[2];
1612	uint32_t attrlen = 0;
1613	unsigned int i;
1614
1615	if (readdir->plus) {
1616		attrs[0] |= FATTR4_WORD0_CHANGE
1617			| FATTR4_WORD0_SIZE
1618			| FATTR4_WORD0_FSID
1619			| FATTR4_WORD0_FILEHANDLE
1620			| FATTR4_WORD0_FILEID;
1621		attrs[1] |= FATTR4_WORD1_MODE
1622			| FATTR4_WORD1_NUMLINKS
1623			| FATTR4_WORD1_OWNER
1624			| FATTR4_WORD1_OWNER_GROUP
1625			| FATTR4_WORD1_RAWDEV
1626			| FATTR4_WORD1_SPACE_USED
1627			| FATTR4_WORD1_TIME_ACCESS
1628			| FATTR4_WORD1_TIME_METADATA
1629			| FATTR4_WORD1_TIME_MODIFY;
1630		attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1631	}
1632	/* Use mounted_on_fileid only if the server supports it */
1633	if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1634		attrs[0] |= FATTR4_WORD0_FILEID;
1635	for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1636		attrs[i] &= readdir->bitmask[i];
1637		if (attrs[i] != 0)
1638			attrlen = i+1;
1639	}
1640
1641	encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1642	encode_uint64(xdr, readdir->cookie);
1643	encode_nfs4_verifier(xdr, &readdir->verifier);
1644	p = reserve_space(xdr, 12 + (attrlen << 2));
1645	*p++ = cpu_to_be32(dircount);
1646	*p++ = cpu_to_be32(maxcount);
1647	*p++ = cpu_to_be32(attrlen);
1648	for (i = 0; i < attrlen; i++)
1649		*p++ = cpu_to_be32(attrs[i]);
1650	memcpy(verf, readdir->verifier.data, sizeof(verf));
1651
1652	dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1653			__func__,
1654			(unsigned long long)readdir->cookie,
1655			verf[0], verf[1],
1656			attrs[0] & readdir->bitmask[0],
1657			attrs[1] & readdir->bitmask[1],
1658			attrs[2] & readdir->bitmask[2]);
1659}
1660
1661static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1662{
1663	encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1664}
1665
1666static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1667{
1668	encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1669	encode_string(xdr, name->len, name->name);
1670}
1671
1672static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1673{
1674	encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1675	encode_string(xdr, oldname->len, oldname->name);
1676	encode_string(xdr, newname->len, newname->name);
1677}
1678
1679static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1680			 struct compound_hdr *hdr)
1681{
1682	encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1683	encode_uint64(xdr, clid);
1684}
1685
1686static void
1687encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1688{
1689	encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1690}
1691
1692static void nfs4_acltype_to_bitmap(enum nfs4_acl_type type, __u32 bitmap[2])
1693{
1694	switch (type) {
1695	default:
1696		bitmap[0] = FATTR4_WORD0_ACL;
1697		bitmap[1] = 0;
1698		break;
1699	case NFS4ACL_DACL:
1700		bitmap[0] = 0;
1701		bitmap[1] = FATTR4_WORD1_DACL;
1702		break;
1703	case NFS4ACL_SACL:
1704		bitmap[0] = 0;
1705		bitmap[1] = FATTR4_WORD1_SACL;
1706	}
1707}
1708
1709static void encode_setacl(struct xdr_stream *xdr,
1710			  const struct nfs_setaclargs *arg,
1711			  struct compound_hdr *hdr)
1712{
1713	__u32 bitmap[2];
1714
1715	nfs4_acltype_to_bitmap(arg->acl_type, bitmap);
1716
1717	encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1718	encode_nfs4_stateid(xdr, &zero_stateid);
1719	xdr_encode_bitmap4(xdr, bitmap, ARRAY_SIZE(bitmap));
1720	encode_uint32(xdr, arg->acl_len);
1721	xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
1722}
1723
1724static void
1725encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1726{
1727	encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1728}
1729
1730static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1731{
1732	encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1733	encode_nfs4_stateid(xdr, &arg->stateid);
1734	encode_attrs(xdr, arg->iap, arg->label, NULL, server,
1735			server->attr_bitmask);
1736}
1737
1738static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1739{
1740	__be32 *p;
1741
1742	encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1743	encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1744
1745	encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1746			setclientid->sc_clnt->cl_owner_id);
1747	p = reserve_space(xdr, 4);
1748	*p = cpu_to_be32(setclientid->sc_prog);
1749	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1750	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1751	p = reserve_space(xdr, 4);
1752	*p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1753}
1754
1755static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1756{
1757	encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1758			decode_setclientid_confirm_maxsz, hdr);
1759	encode_uint64(xdr, arg->clientid);
1760	encode_nfs4_verifier(xdr, &arg->confirm);
1761}
1762
1763static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1764			 struct compound_hdr *hdr)
1765{
1766	__be32 *p;
1767
1768	encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1769	encode_nfs4_stateid(xdr, &args->stateid);
1770
1771	p = reserve_space(xdr, 16);
1772	p = xdr_encode_hyper(p, args->offset);
1773	*p++ = cpu_to_be32(args->stable);
1774	*p = cpu_to_be32(args->count);
1775
1776	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1777}
1778
1779static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1780{
1781	encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1782	encode_nfs4_stateid(xdr, stateid);
1783}
1784
1785static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1786{
1787	encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1788	encode_string(xdr, name->len, name->name);
1789}
1790
1791#if defined(CONFIG_NFS_V4_1)
1792/* NFSv4.1 operations */
1793static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1794				   const struct nfs41_bind_conn_to_session_args *args,
1795				   struct compound_hdr *hdr)
1796{
1797	__be32 *p;
1798
1799	encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1800		decode_bind_conn_to_session_maxsz, hdr);
1801	encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1802	p = xdr_reserve_space(xdr, 8);
1803	*p++ = cpu_to_be32(args->dir);
1804	*p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1805}
1806
1807static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
1808{
1809	unsigned int i;
1810	encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1811	for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1812		encode_uint32(xdr, op_map->u.words[i]);
1813}
1814
1815static void encode_exchange_id(struct xdr_stream *xdr,
1816			       const struct nfs41_exchange_id_args *args,
1817			       struct compound_hdr *hdr)
1818{
1819	__be32 *p;
1820	char impl_name[IMPL_NAME_LIMIT];
1821	int len = 0;
1822
1823	encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1824	encode_nfs4_verifier(xdr, &args->verifier);
1825
1826	encode_string(xdr, strlen(args->client->cl_owner_id),
1827			args->client->cl_owner_id);
1828
1829	encode_uint32(xdr, args->flags);
1830	encode_uint32(xdr, args->state_protect.how);
1831
1832	switch (args->state_protect.how) {
1833	case SP4_NONE:
1834		break;
1835	case SP4_MACH_CRED:
1836		encode_op_map(xdr, &args->state_protect.enforce);
1837		encode_op_map(xdr, &args->state_protect.allow);
1838		break;
1839	default:
1840		WARN_ON_ONCE(1);
1841		break;
1842	}
1843
1844	if (send_implementation_id &&
1845	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1846	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1847		<= sizeof(impl_name) + 1)
1848		len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1849			       utsname()->sysname, utsname()->release,
1850			       utsname()->version, utsname()->machine);
1851
1852	if (len > 0) {
1853		encode_uint32(xdr, 1);	/* implementation id array length=1 */
1854
1855		encode_string(xdr,
1856			sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1857			CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1858		encode_string(xdr, len, impl_name);
1859		/* just send zeros for nii_date - the date is in nii_name */
1860		p = reserve_space(xdr, 12);
1861		p = xdr_encode_hyper(p, 0);
1862		*p = cpu_to_be32(0);
1863	} else
1864		encode_uint32(xdr, 0);	/* implementation id array length=0 */
1865}
1866
1867static void encode_create_session(struct xdr_stream *xdr,
1868				  const struct nfs41_create_session_args *args,
1869				  struct compound_hdr *hdr)
1870{
1871	__be32 *p;
1872	struct nfs_client *clp = args->client;
1873	struct rpc_clnt *clnt = clp->cl_rpcclient;
1874	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1875	u32 max_resp_sz_cached;
1876
1877	/*
1878	 * Assumes OPEN is the biggest non-idempotent compound.
1879	 * 2 is the verifier.
1880	 */
1881	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
1882				* XDR_UNIT + RPC_MAX_AUTH_SIZE;
1883
1884	encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1885	p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1886	p = xdr_encode_hyper(p, args->clientid);
1887	*p++ = cpu_to_be32(args->seqid);			/*Sequence id */
1888	*p++ = cpu_to_be32(args->flags);			/*flags */
1889
1890	/* Fore Channel */
1891	*p++ = cpu_to_be32(0);				/* header padding size */
1892	*p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz);	/* max req size */
1893	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz);	/* max resp size */
1894	*p++ = cpu_to_be32(max_resp_sz_cached);		/* Max resp sz cached */
1895	*p++ = cpu_to_be32(args->fc_attrs.max_ops);	/* max operations */
1896	*p++ = cpu_to_be32(args->fc_attrs.max_reqs);	/* max requests */
1897	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1898
1899	/* Back Channel */
1900	*p++ = cpu_to_be32(0);				/* header padding size */
1901	*p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz);	/* max req size */
1902	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz);	/* max resp size */
1903	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
1904	*p++ = cpu_to_be32(args->bc_attrs.max_ops);	/* max operations */
1905	*p++ = cpu_to_be32(args->bc_attrs.max_reqs);	/* max requests */
1906	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1907
1908	*p++ = cpu_to_be32(args->cb_program);		/* cb_program */
1909	*p++ = cpu_to_be32(1);
1910	*p++ = cpu_to_be32(RPC_AUTH_UNIX);			/* auth_sys */
1911
1912	/* authsys_parms rfc1831 */
1913	*p++ = cpu_to_be32(ktime_to_ns(nn->boot_time));	/* stamp */
1914	p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1915	*p++ = cpu_to_be32(0);				/* UID */
1916	*p++ = cpu_to_be32(0);				/* GID */
1917	*p = cpu_to_be32(0);				/* No more gids */
1918}
1919
1920static void encode_destroy_session(struct xdr_stream *xdr,
1921				   const struct nfs4_session *session,
1922				   struct compound_hdr *hdr)
1923{
1924	encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1925	encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1926}
1927
1928static void encode_destroy_clientid(struct xdr_stream *xdr,
1929				   uint64_t clientid,
1930				   struct compound_hdr *hdr)
1931{
1932	encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1933	encode_uint64(xdr, clientid);
1934}
1935
1936static void encode_reclaim_complete(struct xdr_stream *xdr,
1937				    const struct nfs41_reclaim_complete_args *args,
1938				    struct compound_hdr *hdr)
1939{
1940	encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1941	encode_uint32(xdr, args->one_fs);
1942}
1943#endif /* CONFIG_NFS_V4_1 */
1944
1945static void encode_sequence(struct xdr_stream *xdr,
1946			    const struct nfs4_sequence_args *args,
1947			    struct compound_hdr *hdr)
1948{
1949#if defined(CONFIG_NFS_V4_1)
1950	struct nfs4_session *session;
1951	struct nfs4_slot_table *tp;
1952	struct nfs4_slot *slot = args->sa_slot;
1953	__be32 *p;
1954
1955	tp = slot->table;
1956	session = tp->session;
1957	if (!session)
1958		return;
1959
1960	encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1961
1962	/*
1963	 * Sessionid + seqid + slotid + max slotid + cache_this
1964	 */
1965	dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1966		"max_slotid=%d cache_this=%d\n",
1967		__func__,
1968		((u32 *)session->sess_id.data)[0],
1969		((u32 *)session->sess_id.data)[1],
1970		((u32 *)session->sess_id.data)[2],
1971		((u32 *)session->sess_id.data)[3],
1972		slot->seq_nr, slot->slot_nr,
1973		tp->highest_used_slotid, args->sa_cache_this);
1974	p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1975	p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1976	*p++ = cpu_to_be32(slot->seq_nr);
1977	*p++ = cpu_to_be32(slot->slot_nr);
1978	*p++ = cpu_to_be32(tp->highest_used_slotid);
1979	*p = cpu_to_be32(args->sa_cache_this);
1980#endif /* CONFIG_NFS_V4_1 */
1981}
1982
1983#ifdef CONFIG_NFS_V4_1
1984static void
1985encode_getdeviceinfo(struct xdr_stream *xdr,
1986		     const struct nfs4_getdeviceinfo_args *args,
1987		     struct compound_hdr *hdr)
1988{
1989	__be32 *p;
1990
1991	encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1992	p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1993	p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1994				    NFS4_DEVICEID4_SIZE);
1995	*p++ = cpu_to_be32(args->pdev->layout_type);
1996	*p++ = cpu_to_be32(args->pdev->maxcount);	/* gdia_maxcount */
1997
1998	p = reserve_space(xdr, 4 + 4);
1999	*p++ = cpu_to_be32(1);			/* bitmap length */
2000	*p++ = cpu_to_be32(args->notify_types);
2001}
2002
2003static void
2004encode_layoutget(struct xdr_stream *xdr,
2005		      const struct nfs4_layoutget_args *args,
2006		      struct compound_hdr *hdr)
2007{
2008	__be32 *p;
2009
2010	encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
2011	p = reserve_space(xdr, 36);
2012	*p++ = cpu_to_be32(0);     /* Signal layout available */
2013	*p++ = cpu_to_be32(args->type);
2014	*p++ = cpu_to_be32(args->range.iomode);
2015	p = xdr_encode_hyper(p, args->range.offset);
2016	p = xdr_encode_hyper(p, args->range.length);
2017	p = xdr_encode_hyper(p, args->minlength);
2018	encode_nfs4_stateid(xdr, &args->stateid);
2019	encode_uint32(xdr, args->maxcount);
2020
2021	dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
2022		__func__,
2023		args->type,
2024		args->range.iomode,
2025		(unsigned long)args->range.offset,
2026		(unsigned long)args->range.length,
2027		args->maxcount);
2028}
2029
2030static int
2031encode_layoutcommit(struct xdr_stream *xdr,
2032		    struct inode *inode,
2033		    const struct nfs4_layoutcommit_args *args,
2034		    struct compound_hdr *hdr)
2035{
2036	__be32 *p;
2037
2038	dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
2039		NFS_SERVER(args->inode)->pnfs_curr_ld->id);
2040
2041	encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2042	p = reserve_space(xdr, 20);
2043	/* Only whole file layouts */
2044	p = xdr_encode_hyper(p, 0); /* offset */
2045	p = xdr_encode_hyper(p, args->lastbytewritten + 1);	/* length */
2046	*p = cpu_to_be32(0); /* reclaim */
2047	encode_nfs4_stateid(xdr, &args->stateid);
2048	if (args->lastbytewritten != U64_MAX) {
2049		p = reserve_space(xdr, 20);
2050		*p++ = cpu_to_be32(1); /* newoffset = TRUE */
2051		p = xdr_encode_hyper(p, args->lastbytewritten);
2052	} else {
2053		p = reserve_space(xdr, 12);
2054		*p++ = cpu_to_be32(0); /* newoffset = FALSE */
2055	}
2056	*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2057	*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2058
2059	encode_uint32(xdr, args->layoutupdate_len);
2060	if (args->layoutupdate_pages)
2061		xdr_write_pages(xdr, args->layoutupdate_pages, 0,
2062				args->layoutupdate_len);
2063
2064	return 0;
2065}
2066
2067static void
2068encode_layoutreturn(struct xdr_stream *xdr,
2069		    const struct nfs4_layoutreturn_args *args,
2070		    struct compound_hdr *hdr)
2071{
2072	__be32 *p;
2073
2074	encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2075	p = reserve_space(xdr, 16);
2076	*p++ = cpu_to_be32(0);		/* reclaim. always 0 for now */
2077	*p++ = cpu_to_be32(args->layout_type);
2078	*p++ = cpu_to_be32(args->range.iomode);
2079	*p = cpu_to_be32(RETURN_FILE);
2080	p = reserve_space(xdr, 16);
2081	p = xdr_encode_hyper(p, args->range.offset);
2082	p = xdr_encode_hyper(p, args->range.length);
2083	spin_lock(&args->inode->i_lock);
2084	encode_nfs4_stateid(xdr, &args->stateid);
2085	spin_unlock(&args->inode->i_lock);
2086	if (args->ld_private->ops && args->ld_private->ops->encode)
2087		args->ld_private->ops->encode(xdr, args, args->ld_private);
2088	else
2089		encode_uint32(xdr, 0);
2090}
2091
2092static int
2093encode_secinfo_no_name(struct xdr_stream *xdr,
2094		       const struct nfs41_secinfo_no_name_args *args,
2095		       struct compound_hdr *hdr)
2096{
2097	encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2098	encode_uint32(xdr, args->style);
2099	return 0;
2100}
2101
2102static void encode_test_stateid(struct xdr_stream *xdr,
2103				const struct nfs41_test_stateid_args *args,
2104				struct compound_hdr *hdr)
2105{
2106	encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2107	encode_uint32(xdr, 1);
2108	encode_nfs4_stateid(xdr, args->stateid);
2109}
2110
2111static void encode_free_stateid(struct xdr_stream *xdr,
2112				const struct nfs41_free_stateid_args *args,
2113				struct compound_hdr *hdr)
2114{
2115	encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2116	encode_nfs4_stateid(xdr, &args->stateid);
2117}
2118#else
2119static inline void
2120encode_layoutreturn(struct xdr_stream *xdr,
2121		    const struct nfs4_layoutreturn_args *args,
2122		    struct compound_hdr *hdr)
2123{
2124}
2125
2126static void
2127encode_layoutget(struct xdr_stream *xdr,
2128		      const struct nfs4_layoutget_args *args,
2129		      struct compound_hdr *hdr)
2130{
2131}
2132#endif /* CONFIG_NFS_V4_1 */
2133
2134/*
2135 * END OF "GENERIC" ENCODE ROUTINES.
2136 */
2137
2138static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2139{
2140#if defined(CONFIG_NFS_V4_1)
2141	struct nfs4_session *session = args->sa_slot->table->session;
2142	if (session)
2143		return session->clp->cl_mvops->minor_version;
2144#endif /* CONFIG_NFS_V4_1 */
2145	return 0;
2146}
2147
2148/*
2149 * Encode an ACCESS request
2150 */
2151static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2152				const void *data)
2153{
2154	const struct nfs4_accessargs *args = data;
2155	struct compound_hdr hdr = {
2156		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2157	};
2158
2159	encode_compound_hdr(xdr, req, &hdr);
2160	encode_sequence(xdr, &args->seq_args, &hdr);
2161	encode_putfh(xdr, args->fh, &hdr);
2162	encode_access(xdr, args->access, &hdr);
2163	if (args->bitmask)
2164		encode_getfattr(xdr, args->bitmask, &hdr);
2165	encode_nops(&hdr);
2166}
2167
2168/*
2169 * Encode LOOKUP request
2170 */
2171static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2172				const void *data)
2173{
2174	const struct nfs4_lookup_arg *args = data;
2175	struct compound_hdr hdr = {
2176		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2177	};
2178
2179	encode_compound_hdr(xdr, req, &hdr);
2180	encode_sequence(xdr, &args->seq_args, &hdr);
2181	encode_putfh(xdr, args->dir_fh, &hdr);
2182	encode_lookup(xdr, args->name, &hdr);
2183	encode_getfh(xdr, &hdr);
2184	encode_getfattr(xdr, args->bitmask, &hdr);
2185	encode_nops(&hdr);
2186}
2187
2188/*
2189 * Encode LOOKUPP request
2190 */
2191static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
2192		const void *data)
2193{
2194	const struct nfs4_lookupp_arg *args = data;
2195	struct compound_hdr hdr = {
2196		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2197	};
2198
2199	encode_compound_hdr(xdr, req, &hdr);
2200	encode_sequence(xdr, &args->seq_args, &hdr);
2201	encode_putfh(xdr, args->fh, &hdr);
2202	encode_lookupp(xdr, &hdr);
2203	encode_getfh(xdr, &hdr);
2204	encode_getfattr(xdr, args->bitmask, &hdr);
2205	encode_nops(&hdr);
2206}
2207
2208/*
2209 * Encode LOOKUP_ROOT request
2210 */
2211static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2212				     struct xdr_stream *xdr,
2213				     const void *data)
2214{
2215	const struct nfs4_lookup_root_arg *args = data;
2216	struct compound_hdr hdr = {
2217		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2218	};
2219
2220	encode_compound_hdr(xdr, req, &hdr);
2221	encode_sequence(xdr, &args->seq_args, &hdr);
2222	encode_putrootfh(xdr, &hdr);
2223	encode_getfh(xdr, &hdr);
2224	encode_getfattr(xdr, args->bitmask, &hdr);
2225	encode_nops(&hdr);
2226}
2227
2228/*
2229 * Encode REMOVE request
2230 */
2231static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2232				const void *data)
2233{
2234	const struct nfs_removeargs *args = data;
2235	struct compound_hdr hdr = {
2236		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2237	};
2238
2239	encode_compound_hdr(xdr, req, &hdr);
2240	encode_sequence(xdr, &args->seq_args, &hdr);
2241	encode_putfh(xdr, args->fh, &hdr);
2242	encode_remove(xdr, &args->name, &hdr);
2243	encode_nops(&hdr);
2244}
2245
2246/*
2247 * Encode RENAME request
2248 */
2249static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2250				const void *data)
2251{
2252	const struct nfs_renameargs *args = data;
2253	struct compound_hdr hdr = {
2254		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2255	};
2256
2257	encode_compound_hdr(xdr, req, &hdr);
2258	encode_sequence(xdr, &args->seq_args, &hdr);
2259	encode_putfh(xdr, args->old_dir, &hdr);
2260	encode_savefh(xdr, &hdr);
2261	encode_putfh(xdr, args->new_dir, &hdr);
2262	encode_rename(xdr, args->old_name, args->new_name, &hdr);
2263	encode_nops(&hdr);
2264}
2265
2266/*
2267 * Encode LINK request
2268 */
2269static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2270			      const void *data)
2271{
2272	const struct nfs4_link_arg *args = data;
2273	struct compound_hdr hdr = {
2274		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2275	};
2276
2277	encode_compound_hdr(xdr, req, &hdr);
2278	encode_sequence(xdr, &args->seq_args, &hdr);
2279	encode_putfh(xdr, args->fh, &hdr);
2280	encode_savefh(xdr, &hdr);
2281	encode_putfh(xdr, args->dir_fh, &hdr);
2282	encode_link(xdr, args->name, &hdr);
2283	encode_restorefh(xdr, &hdr);
2284	encode_getfattr(xdr, args->bitmask, &hdr);
2285	encode_nops(&hdr);
2286}
2287
2288/*
2289 * Encode CREATE request
2290 */
2291static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2292				const void *data)
2293{
2294	const struct nfs4_create_arg *args = data;
2295	struct compound_hdr hdr = {
2296		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2297	};
2298
2299	encode_compound_hdr(xdr, req, &hdr);
2300	encode_sequence(xdr, &args->seq_args, &hdr);
2301	encode_putfh(xdr, args->dir_fh, &hdr);
2302	encode_create(xdr, args, &hdr);
2303	encode_getfh(xdr, &hdr);
2304	encode_getfattr(xdr, args->bitmask, &hdr);
2305	encode_nops(&hdr);
2306}
2307
2308/*
2309 * Encode SYMLINK request
2310 */
2311static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2312				 const void *data)
2313{
2314	const struct nfs4_create_arg *args = data;
2315
2316	nfs4_xdr_enc_create(req, xdr, args);
2317}
2318
2319/*
2320 * Encode GETATTR request
2321 */
2322static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2323				 const void *data)
2324{
2325	const struct nfs4_getattr_arg *args = data;
2326	struct compound_hdr hdr = {
2327		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2328	};
2329
2330	encode_compound_hdr(xdr, req, &hdr);
2331	encode_sequence(xdr, &args->seq_args, &hdr);
2332	encode_putfh(xdr, args->fh, &hdr);
2333	encode_getfattr(xdr, args->bitmask, &hdr);
2334	encode_nops(&hdr);
2335}
2336
2337/*
2338 * Encode a CLOSE request
2339 */
2340static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2341			       const void *data)
2342{
2343	const struct nfs_closeargs *args = data;
2344	struct compound_hdr hdr = {
2345		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2346	};
2347
2348	encode_compound_hdr(xdr, req, &hdr);
2349	encode_sequence(xdr, &args->seq_args, &hdr);
2350	encode_putfh(xdr, args->fh, &hdr);
2351	if (args->lr_args)
2352		encode_layoutreturn(xdr, args->lr_args, &hdr);
2353	if (args->bitmask != NULL)
2354		encode_getfattr(xdr, args->bitmask, &hdr);
2355	encode_close(xdr, args, &hdr);
2356	encode_nops(&hdr);
2357}
2358
2359/*
2360 * Encode an OPEN request
2361 */
2362static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2363			      const void *data)
2364{
2365	const struct nfs_openargs *args = data;
2366	struct compound_hdr hdr = {
2367		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2368	};
2369
2370	encode_compound_hdr(xdr, req, &hdr);
2371	encode_sequence(xdr, &args->seq_args, &hdr);
2372	encode_putfh(xdr, args->fh, &hdr);
2373	encode_open(xdr, args, &hdr);
2374	encode_getfh(xdr, &hdr);
2375	if (args->access)
2376		encode_access(xdr, args->access, &hdr);
2377	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2378	if (args->lg_args) {
2379		encode_layoutget(xdr, args->lg_args, &hdr);
2380		rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2381					args->lg_args->layout.pglen,
2382					hdr.replen - pagepad_maxsz);
2383	}
2384	encode_nops(&hdr);
2385}
2386
2387/*
2388 * Encode an OPEN_CONFIRM request
2389 */
2390static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2391				      struct xdr_stream *xdr,
2392				      const void *data)
2393{
2394	const struct nfs_open_confirmargs *args = data;
2395	struct compound_hdr hdr = {
2396		.nops   = 0,
2397	};
2398
2399	encode_compound_hdr(xdr, req, &hdr);
2400	encode_putfh(xdr, args->fh, &hdr);
2401	encode_open_confirm(xdr, args, &hdr);
2402	encode_nops(&hdr);
2403}
2404
2405/*
2406 * Encode an OPEN request with no attributes.
2407 */
2408static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2409				     struct xdr_stream *xdr,
2410				     const void *data)
2411{
2412	const struct nfs_openargs *args = data;
2413	struct compound_hdr hdr = {
2414		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2415	};
2416
2417	encode_compound_hdr(xdr, req, &hdr);
2418	encode_sequence(xdr, &args->seq_args, &hdr);
2419	encode_putfh(xdr, args->fh, &hdr);
2420	encode_open(xdr, args, &hdr);
2421	if (args->access)
2422		encode_access(xdr, args->access, &hdr);
2423	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2424	if (args->lg_args) {
2425		encode_layoutget(xdr, args->lg_args, &hdr);
2426		rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2427					args->lg_args->layout.pglen,
2428					hdr.replen - pagepad_maxsz);
2429	}
2430	encode_nops(&hdr);
2431}
2432
2433/*
2434 * Encode an OPEN_DOWNGRADE request
2435 */
2436static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2437					struct xdr_stream *xdr,
2438					const void *data)
2439{
2440	const struct nfs_closeargs *args = data;
2441	struct compound_hdr hdr = {
2442		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2443	};
2444
2445	encode_compound_hdr(xdr, req, &hdr);
2446	encode_sequence(xdr, &args->seq_args, &hdr);
2447	encode_putfh(xdr, args->fh, &hdr);
2448	if (args->lr_args)
2449		encode_layoutreturn(xdr, args->lr_args, &hdr);
2450	encode_open_downgrade(xdr, args, &hdr);
2451	encode_nops(&hdr);
2452}
2453
2454/*
2455 * Encode a LOCK request
2456 */
2457static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2458			      const void *data)
2459{
2460	const struct nfs_lock_args *args = data;
2461	struct compound_hdr hdr = {
2462		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2463	};
2464
2465	encode_compound_hdr(xdr, req, &hdr);
2466	encode_sequence(xdr, &args->seq_args, &hdr);
2467	encode_putfh(xdr, args->fh, &hdr);
2468	encode_lock(xdr, args, &hdr);
2469	encode_nops(&hdr);
2470}
2471
2472/*
2473 * Encode a LOCKT request
2474 */
2475static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2476			       const void *data)
2477{
2478	const struct nfs_lockt_args *args = data;
2479	struct compound_hdr hdr = {
2480		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2481	};
2482
2483	encode_compound_hdr(xdr, req, &hdr);
2484	encode_sequence(xdr, &args->seq_args, &hdr);
2485	encode_putfh(xdr, args->fh, &hdr);
2486	encode_lockt(xdr, args, &hdr);
2487	encode_nops(&hdr);
2488}
2489
2490/*
2491 * Encode a LOCKU request
2492 */
2493static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2494			       const void *data)
2495{
2496	const struct nfs_locku_args *args = data;
2497	struct compound_hdr hdr = {
2498		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2499	};
2500
2501	encode_compound_hdr(xdr, req, &hdr);
2502	encode_sequence(xdr, &args->seq_args, &hdr);
2503	encode_putfh(xdr, args->fh, &hdr);
2504	encode_locku(xdr, args, &hdr);
2505	encode_nops(&hdr);
2506}
2507
2508static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2509					   struct xdr_stream *xdr,
2510					   const void *data)
2511{
2512	const struct nfs_release_lockowner_args *args = data;
2513	struct compound_hdr hdr = {
2514		.minorversion = 0,
2515	};
2516
2517	encode_compound_hdr(xdr, req, &hdr);
2518	encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2519	encode_nops(&hdr);
2520}
2521
2522/*
2523 * Encode a READLINK request
2524 */
2525static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2526				  const void *data)
2527{
2528	const struct nfs4_readlink *args = data;
2529	struct compound_hdr hdr = {
2530		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2531	};
2532
2533	encode_compound_hdr(xdr, req, &hdr);
2534	encode_sequence(xdr, &args->seq_args, &hdr);
2535	encode_putfh(xdr, args->fh, &hdr);
2536	encode_readlink(xdr, args, req, &hdr);
2537
2538	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2539				args->pglen, hdr.replen - pagepad_maxsz);
2540	encode_nops(&hdr);
2541}
2542
2543/*
2544 * Encode a READDIR request
2545 */
2546static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2547				 const void *data)
2548{
2549	const struct nfs4_readdir_arg *args = data;
2550	struct compound_hdr hdr = {
2551		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2552	};
2553
2554	encode_compound_hdr(xdr, req, &hdr);
2555	encode_sequence(xdr, &args->seq_args, &hdr);
2556	encode_putfh(xdr, args->fh, &hdr);
2557	encode_readdir(xdr, args, req, &hdr);
2558
2559	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2560				args->count, hdr.replen - pagepad_maxsz);
2561	encode_nops(&hdr);
2562}
2563
2564/*
2565 * Encode a READ request
2566 */
2567static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2568			      const void *data)
2569{
2570	const struct nfs_pgio_args *args = data;
2571	struct compound_hdr hdr = {
2572		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2573	};
2574
2575	encode_compound_hdr(xdr, req, &hdr);
2576	encode_sequence(xdr, &args->seq_args, &hdr);
2577	encode_putfh(xdr, args->fh, &hdr);
2578	encode_read(xdr, args, &hdr);
2579
2580	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2581				args->count, hdr.replen - pagepad_maxsz);
2582	req->rq_rcv_buf.flags |= XDRBUF_READ;
2583	encode_nops(&hdr);
2584}
2585
2586/*
2587 * Encode an SETATTR request
2588 */
2589static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2590				 const void *data)
2591{
2592	const struct nfs_setattrargs *args = data;
2593	struct compound_hdr hdr = {
2594		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2595	};
2596
2597	encode_compound_hdr(xdr, req, &hdr);
2598	encode_sequence(xdr, &args->seq_args, &hdr);
2599	encode_putfh(xdr, args->fh, &hdr);
2600	encode_setattr(xdr, args, args->server, &hdr);
2601	encode_getfattr(xdr, args->bitmask, &hdr);
2602	encode_nops(&hdr);
2603}
2604
2605/*
2606 * Encode a GETACL request
2607 */
2608static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2609				const void *data)
2610{
2611	const struct nfs_getaclargs *args = data;
2612	struct compound_hdr hdr = {
2613		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2614	};
2615	__u32 nfs4_acl_bitmap[2];
2616	uint32_t replen;
2617
2618	nfs4_acltype_to_bitmap(args->acl_type, nfs4_acl_bitmap);
2619
2620	encode_compound_hdr(xdr, req, &hdr);
2621	encode_sequence(xdr, &args->seq_args, &hdr);
2622	encode_putfh(xdr, args->fh, &hdr);
2623	replen = hdr.replen + op_decode_hdr_maxsz;
2624	encode_getattr(xdr, nfs4_acl_bitmap, NULL,
2625			ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
2626
2627	rpc_prepare_reply_pages(req, args->acl_pages, 0,
2628				args->acl_len, replen);
2629	encode_nops(&hdr);
2630}
2631
2632/*
2633 * Encode a WRITE request
2634 */
2635static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2636			       const void *data)
2637{
2638	const struct nfs_pgio_args *args = data;
2639	struct compound_hdr hdr = {
2640		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2641	};
2642
2643	encode_compound_hdr(xdr, req, &hdr);
2644	encode_sequence(xdr, &args->seq_args, &hdr);
2645	encode_putfh(xdr, args->fh, &hdr);
2646	encode_write(xdr, args, &hdr);
2647	req->rq_snd_buf.flags |= XDRBUF_WRITE;
2648	if (args->bitmask)
2649		encode_getfattr(xdr, args->bitmask, &hdr);
2650	encode_nops(&hdr);
2651}
2652
2653/*
2654 *  a COMMIT request
2655 */
2656static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2657				const void *data)
2658{
2659	const struct nfs_commitargs *args = data;
2660	struct compound_hdr hdr = {
2661		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2662	};
2663
2664	encode_compound_hdr(xdr, req, &hdr);
2665	encode_sequence(xdr, &args->seq_args, &hdr);
2666	encode_putfh(xdr, args->fh, &hdr);
2667	encode_commit(xdr, args, &hdr);
2668	encode_nops(&hdr);
2669}
2670
2671/*
2672 * FSINFO request
2673 */
2674static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2675				const void *data)
2676{
2677	const struct nfs4_fsinfo_arg *args = data;
2678	struct compound_hdr hdr = {
2679		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2680	};
2681
2682	encode_compound_hdr(xdr, req, &hdr);
2683	encode_sequence(xdr, &args->seq_args, &hdr);
2684	encode_putfh(xdr, args->fh, &hdr);
2685	encode_fsinfo(xdr, args->bitmask, &hdr);
2686	encode_nops(&hdr);
2687}
2688
2689/*
2690 * a PATHCONF request
2691 */
2692static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2693				  const void *data)
2694{
2695	const struct nfs4_pathconf_arg *args = data;
2696	struct compound_hdr hdr = {
2697		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2698	};
2699
2700	encode_compound_hdr(xdr, req, &hdr);
2701	encode_sequence(xdr, &args->seq_args, &hdr);
2702	encode_putfh(xdr, args->fh, &hdr);
2703	encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
2704			ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
2705	encode_nops(&hdr);
2706}
2707
2708/*
2709 * a STATFS request
2710 */
2711static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2712				const void *data)
2713{
2714	const struct nfs4_statfs_arg *args = data;
2715	struct compound_hdr hdr = {
2716		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2717	};
2718
2719	encode_compound_hdr(xdr, req, &hdr);
2720	encode_sequence(xdr, &args->seq_args, &hdr);
2721	encode_putfh(xdr, args->fh, &hdr);
2722	encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
2723			ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
2724	encode_nops(&hdr);
2725}
2726
2727/*
2728 * GETATTR_BITMAP request
2729 */
2730static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2731				     struct xdr_stream *xdr,
2732				     const void *data)
2733{
2734	const struct nfs4_server_caps_arg *args = data;
2735	const u32 *bitmask = args->bitmask;
2736	struct compound_hdr hdr = {
2737		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2738	};
2739
2740	encode_compound_hdr(xdr, req, &hdr);
2741	encode_sequence(xdr, &args->seq_args, &hdr);
2742	encode_putfh(xdr, args->fhandle, &hdr);
2743	encode_getattr(xdr, bitmask, NULL, 3, &hdr);
2744	encode_nops(&hdr);
2745}
2746
2747/*
2748 * a RENEW request
2749 */
2750static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2751			       const void *data)
2752
2753{
2754	const struct nfs_client *clp = data;
2755	struct compound_hdr hdr = {
2756		.nops	= 0,
2757	};
2758
2759	encode_compound_hdr(xdr, req, &hdr);
2760	encode_renew(xdr, clp->cl_clientid, &hdr);
2761	encode_nops(&hdr);
2762}
2763
2764/*
2765 * a SETCLIENTID request
2766 */
2767static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2768				     struct xdr_stream *xdr,
2769				     const void *data)
2770{
2771	const struct nfs4_setclientid *sc = data;
2772	struct compound_hdr hdr = {
2773		.nops	= 0,
2774	};
2775
2776	encode_compound_hdr(xdr, req, &hdr);
2777	encode_setclientid(xdr, sc, &hdr);
2778	encode_nops(&hdr);
2779}
2780
2781/*
2782 * a SETCLIENTID_CONFIRM request
2783 */
2784static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2785					     struct xdr_stream *xdr,
2786					     const void *data)
2787{
2788	const struct nfs4_setclientid_res *arg = data;
2789	struct compound_hdr hdr = {
2790		.nops	= 0,
2791	};
2792
2793	encode_compound_hdr(xdr, req, &hdr);
2794	encode_setclientid_confirm(xdr, arg, &hdr);
2795	encode_nops(&hdr);
2796}
2797
2798/*
2799 * DELEGRETURN request
2800 */
2801static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2802				     struct xdr_stream *xdr,
2803				     const void *data)
2804{
2805	const struct nfs4_delegreturnargs *args = data;
2806	struct compound_hdr hdr = {
2807		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2808	};
2809
2810	encode_compound_hdr(xdr, req, &hdr);
2811	encode_sequence(xdr, &args->seq_args, &hdr);
2812	encode_putfh(xdr, args->fhandle, &hdr);
2813	if (args->lr_args)
2814		encode_layoutreturn(xdr, args->lr_args, &hdr);
2815	if (args->bitmask)
2816		encode_getfattr(xdr, args->bitmask, &hdr);
2817	encode_delegreturn(xdr, args->stateid, &hdr);
2818	encode_nops(&hdr);
2819}
2820
2821/*
2822 * Encode FS_LOCATIONS request
2823 */
2824static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2825				      struct xdr_stream *xdr,
2826				      const void *data)
2827{
2828	const struct nfs4_fs_locations_arg *args = data;
2829	struct compound_hdr hdr = {
2830		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2831	};
2832	uint32_t replen;
2833
2834	encode_compound_hdr(xdr, req, &hdr);
2835	encode_sequence(xdr, &args->seq_args, &hdr);
2836	if (args->migration) {
2837		encode_putfh(xdr, args->fh, &hdr);
2838		replen = hdr.replen;
2839		encode_fs_locations(xdr, args->bitmask, &hdr);
2840		if (args->renew)
2841			encode_renew(xdr, args->clientid, &hdr);
2842	} else {
2843		encode_putfh(xdr, args->dir_fh, &hdr);
2844		encode_lookup(xdr, args->name, &hdr);
2845		replen = hdr.replen;
2846		encode_fs_locations(xdr, args->bitmask, &hdr);
2847	}
2848
2849	rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
2850				PAGE_SIZE, replen);
2851	encode_nops(&hdr);
2852}
2853
2854/*
2855 * Encode SECINFO request
2856 */
2857static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2858				struct xdr_stream *xdr,
2859				const void *data)
2860{
2861	const struct nfs4_secinfo_arg *args = data;
2862	struct compound_hdr hdr = {
2863		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2864	};
2865
2866	encode_compound_hdr(xdr, req, &hdr);
2867	encode_sequence(xdr, &args->seq_args, &hdr);
2868	encode_putfh(xdr, args->dir_fh, &hdr);
2869	encode_secinfo(xdr, args->name, &hdr);
2870	encode_nops(&hdr);
2871}
2872
2873/*
2874 * Encode FSID_PRESENT request
2875 */
2876static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2877				      struct xdr_stream *xdr,
2878				      const void *data)
2879{
2880	const struct nfs4_fsid_present_arg *args = data;
2881	struct compound_hdr hdr = {
2882		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2883	};
2884
2885	encode_compound_hdr(xdr, req, &hdr);
2886	encode_sequence(xdr, &args->seq_args, &hdr);
2887	encode_putfh(xdr, args->fh, &hdr);
2888	encode_getfh(xdr, &hdr);
2889	if (args->renew)
2890		encode_renew(xdr, args->clientid, &hdr);
2891	encode_nops(&hdr);
2892}
2893
2894#if defined(CONFIG_NFS_V4_1)
2895/*
2896 * BIND_CONN_TO_SESSION request
2897 */
2898static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2899				struct xdr_stream *xdr,
2900				const void *data)
2901{
2902	const struct nfs41_bind_conn_to_session_args *args = data;
2903	struct compound_hdr hdr = {
2904		.minorversion = args->client->cl_mvops->minor_version,
2905	};
2906
2907	encode_compound_hdr(xdr, req, &hdr);
2908	encode_bind_conn_to_session(xdr, args, &hdr);
2909	encode_nops(&hdr);
2910}
2911
2912/*
2913 * EXCHANGE_ID request
2914 */
2915static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2916				     struct xdr_stream *xdr,
2917				     const void *data)
2918{
2919	const struct nfs41_exchange_id_args *args = data;
2920	struct compound_hdr hdr = {
2921		.minorversion = args->client->cl_mvops->minor_version,
2922	};
2923
2924	encode_compound_hdr(xdr, req, &hdr);
2925	encode_exchange_id(xdr, args, &hdr);
2926	encode_nops(&hdr);
2927}
2928
2929/*
2930 * a CREATE_SESSION request
2931 */
2932static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2933					struct xdr_stream *xdr,
2934					const void *data)
2935{
2936	const struct nfs41_create_session_args *args = data;
2937	struct compound_hdr hdr = {
2938		.minorversion = args->client->cl_mvops->minor_version,
2939	};
2940
2941	encode_compound_hdr(xdr, req, &hdr);
2942	encode_create_session(xdr, args, &hdr);
2943	encode_nops(&hdr);
2944}
2945
2946/*
2947 * a DESTROY_SESSION request
2948 */
2949static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2950					 struct xdr_stream *xdr,
2951					 const void *data)
2952{
2953	const struct nfs4_session *session = data;
2954	struct compound_hdr hdr = {
2955		.minorversion = session->clp->cl_mvops->minor_version,
2956	};
2957
2958	encode_compound_hdr(xdr, req, &hdr);
2959	encode_destroy_session(xdr, session, &hdr);
2960	encode_nops(&hdr);
2961}
2962
2963/*
2964 * a DESTROY_CLIENTID request
2965 */
2966static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2967					 struct xdr_stream *xdr,
2968					 const void *data)
2969{
2970	const struct nfs_client *clp = data;
2971	struct compound_hdr hdr = {
2972		.minorversion = clp->cl_mvops->minor_version,
2973	};
2974
2975	encode_compound_hdr(xdr, req, &hdr);
2976	encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2977	encode_nops(&hdr);
2978}
2979
2980/*
2981 * a SEQUENCE request
2982 */
2983static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2984				  const void *data)
2985{
2986	const struct nfs4_sequence_args *args = data;
2987	struct compound_hdr hdr = {
2988		.minorversion = nfs4_xdr_minorversion(args),
2989	};
2990
2991	encode_compound_hdr(xdr, req, &hdr);
2992	encode_sequence(xdr, args, &hdr);
2993	encode_nops(&hdr);
2994}
2995
2996#endif
2997
2998/*
2999 * a GET_LEASE_TIME request
3000 */
3001static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
3002					struct xdr_stream *xdr,
3003					const void *data)
3004{
3005	const struct nfs4_get_lease_time_args *args = data;
3006	struct compound_hdr hdr = {
3007		.minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
3008	};
3009	const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
3010
3011	encode_compound_hdr(xdr, req, &hdr);
3012	encode_sequence(xdr, &args->la_seq_args, &hdr);
3013	encode_putrootfh(xdr, &hdr);
3014	encode_fsinfo(xdr, lease_bitmap, &hdr);
3015	encode_nops(&hdr);
3016}
3017
3018#ifdef CONFIG_NFS_V4_1
3019
3020/*
3021 * a RECLAIM_COMPLETE request
3022 */
3023static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
3024					  struct xdr_stream *xdr,
3025					  const void *data)
3026{
3027	const struct nfs41_reclaim_complete_args *args = data;
3028	struct compound_hdr hdr = {
3029		.minorversion = nfs4_xdr_minorversion(&args->seq_args)
3030	};
3031
3032	encode_compound_hdr(xdr, req, &hdr);
3033	encode_sequence(xdr, &args->seq_args, &hdr);
3034	encode_reclaim_complete(xdr, args, &hdr);
3035	encode_nops(&hdr);
3036}
3037
3038/*
3039 * Encode GETDEVICEINFO request
3040 */
3041static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
3042				       struct xdr_stream *xdr,
3043				       const void *data)
3044{
3045	const struct nfs4_getdeviceinfo_args *args = data;
3046	struct compound_hdr hdr = {
3047		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3048	};
3049	uint32_t replen;
3050
3051	encode_compound_hdr(xdr, req, &hdr);
3052	encode_sequence(xdr, &args->seq_args, &hdr);
3053
3054	replen = hdr.replen + op_decode_hdr_maxsz + 2;
3055
3056	encode_getdeviceinfo(xdr, args, &hdr);
3057
3058	/* set up reply kvec. device_addr4 opaque data is read into the
3059	 * pages */
3060	rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
3061				args->pdev->pglen, replen);
3062	encode_nops(&hdr);
3063}
3064
3065/*
3066 *  Encode LAYOUTGET request
3067 */
3068static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
3069				   struct xdr_stream *xdr,
3070				   const void *data)
3071{
3072	const struct nfs4_layoutget_args *args = data;
3073	struct compound_hdr hdr = {
3074		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3075	};
3076
3077	encode_compound_hdr(xdr, req, &hdr);
3078	encode_sequence(xdr, &args->seq_args, &hdr);
3079	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3080	encode_layoutget(xdr, args, &hdr);
3081
3082	rpc_prepare_reply_pages(req, args->layout.pages, 0,
3083				args->layout.pglen, hdr.replen - pagepad_maxsz);
3084	encode_nops(&hdr);
3085}
3086
3087/*
3088 *  Encode LAYOUTCOMMIT request
3089 */
3090static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
3091				      struct xdr_stream *xdr,
3092				      const void *priv)
3093{
3094	const struct nfs4_layoutcommit_args *args = priv;
3095	struct nfs4_layoutcommit_data *data =
3096		container_of(args, struct nfs4_layoutcommit_data, args);
3097	struct compound_hdr hdr = {
3098		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3099	};
3100
3101	encode_compound_hdr(xdr, req, &hdr);
3102	encode_sequence(xdr, &args->seq_args, &hdr);
3103	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3104	encode_layoutcommit(xdr, data->args.inode, args, &hdr);
3105	encode_getfattr(xdr, args->bitmask, &hdr);
3106	encode_nops(&hdr);
3107}
3108
3109/*
3110 * Encode LAYOUTRETURN request
3111 */
3112static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
3113				      struct xdr_stream *xdr,
3114				      const void *data)
3115{
3116	const struct nfs4_layoutreturn_args *args = data;
3117	struct compound_hdr hdr = {
3118		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3119	};
3120
3121	encode_compound_hdr(xdr, req, &hdr);
3122	encode_sequence(xdr, &args->seq_args, &hdr);
3123	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3124	encode_layoutreturn(xdr, args, &hdr);
3125	encode_nops(&hdr);
3126}
3127
3128/*
3129 * Encode SECINFO_NO_NAME request
3130 */
3131static void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3132					struct xdr_stream *xdr,
3133					const void *data)
3134{
3135	const struct nfs41_secinfo_no_name_args *args = data;
3136	struct compound_hdr hdr = {
3137		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3138	};
3139
3140	encode_compound_hdr(xdr, req, &hdr);
3141	encode_sequence(xdr, &args->seq_args, &hdr);
3142	encode_putrootfh(xdr, &hdr);
3143	encode_secinfo_no_name(xdr, args, &hdr);
3144	encode_nops(&hdr);
3145}
3146
3147/*
3148 *  Encode TEST_STATEID request
3149 */
3150static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3151				      struct xdr_stream *xdr,
3152				      const void *data)
3153{
3154	const struct nfs41_test_stateid_args *args = data;
3155	struct compound_hdr hdr = {
3156		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3157	};
3158
3159	encode_compound_hdr(xdr, req, &hdr);
3160	encode_sequence(xdr, &args->seq_args, &hdr);
3161	encode_test_stateid(xdr, args, &hdr);
3162	encode_nops(&hdr);
3163}
3164
3165/*
3166 *  Encode FREE_STATEID request
3167 */
3168static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3169				     struct xdr_stream *xdr,
3170				     const void *data)
3171{
3172	const struct nfs41_free_stateid_args *args = data;
3173	struct compound_hdr hdr = {
3174		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3175	};
3176
3177	encode_compound_hdr(xdr, req, &hdr);
3178	encode_sequence(xdr, &args->seq_args, &hdr);
3179	encode_free_stateid(xdr, args, &hdr);
3180	encode_nops(&hdr);
3181}
3182#endif /* CONFIG_NFS_V4_1 */
3183
3184static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3185{
3186	ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
3187			NFS4_OPAQUE_LIMIT);
3188	if (unlikely(ret < 0))
3189		return -EIO;
3190	*len = ret;
3191	return 0;
3192}
3193
3194static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3195{
3196	ssize_t ret;
3197	void *ptr;
3198	u32 tmp;
3199
3200	if (xdr_stream_decode_u32(xdr, &tmp) < 0)
3201		return -EIO;
3202	hdr->status = tmp;
3203
3204	ret = xdr_stream_decode_opaque_inline(xdr, &ptr, NFS4_OPAQUE_LIMIT);
3205	if (ret < 0)
3206		return -EIO;
3207	hdr->taglen = ret;
3208	hdr->tag = ptr;
3209
3210	if (xdr_stream_decode_u32(xdr, &tmp) < 0)
3211		return -EIO;
3212	hdr->nops = tmp;
3213	if (unlikely(hdr->nops < 1))
3214		return nfs4_stat_to_errno(hdr->status);
3215	return 0;
3216}
3217
3218static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3219		int *nfs_retval)
3220{
3221	__be32 *p;
3222	uint32_t opnum;
3223	int32_t nfserr;
3224
3225	p = xdr_inline_decode(xdr, 8);
3226	if (unlikely(!p))
3227		goto out_overflow;
3228	opnum = be32_to_cpup(p++);
3229	if (unlikely(opnum != expected))
3230		goto out_bad_operation;
3231	if (unlikely(*p != cpu_to_be32(NFS_OK)))
3232		goto out_status;
3233	*nfs_retval = 0;
3234	return true;
3235out_status:
3236	nfserr = be32_to_cpup(p);
3237	trace_nfs4_xdr_status(xdr, opnum, nfserr);
3238	*nfs_retval = nfs4_stat_to_errno(nfserr);
3239	return true;
3240out_bad_operation:
3241	trace_nfs4_xdr_bad_operation(xdr, opnum, expected);
3242	*nfs_retval = -EREMOTEIO;
3243	return false;
3244out_overflow:
3245	*nfs_retval = -EIO;
3246	return false;
3247}
3248
3249static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3250{
3251	int retval;
3252
3253	__decode_op_hdr(xdr, expected, &retval);
3254	return retval;
3255}
3256
3257/* Dummy routine */
3258static int decode_ace(struct xdr_stream *xdr, void *ace)
3259{
3260	__be32 *p;
3261	unsigned int strlen;
3262	char *str;
3263
3264	p = xdr_inline_decode(xdr, 12);
3265	if (unlikely(!p))
3266		return -EIO;
3267	return decode_opaque_inline(xdr, &strlen, &str);
3268}
3269
3270static ssize_t
3271decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
3272{
3273	ssize_t ret;
3274
3275	ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
3276	if (likely(ret >= 0))
3277		return ret;
3278	if (ret != -EMSGSIZE)
3279		return -EIO;
3280	return sz;
3281}
3282
3283static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3284{
3285	ssize_t ret;
3286	ret = decode_bitmap4(xdr, bitmap, 3);
3287	return ret < 0 ? ret : 0;
3288}
3289
3290static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3291{
3292	__be32 *p;
3293
3294	p = xdr_inline_decode(xdr, 4);
3295	if (unlikely(!p))
3296		return -EIO;
3297	*attrlen = be32_to_cpup(p);
3298	*savep = xdr_stream_pos(xdr);
3299	return 0;
3300}
3301
3302static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3303{
3304	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3305		int ret;
3306		ret = decode_attr_bitmap(xdr, bitmask);
3307		if (unlikely(ret < 0))
3308			return ret;
3309		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3310	} else
3311		bitmask[0] = bitmask[1] = bitmask[2] = 0;
3312	dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3313		bitmask[0], bitmask[1], bitmask[2]);
3314	return 0;
3315}
3316
3317static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3318{
3319	__be32 *p;
3320	int ret = 0;
3321
3322	*type = 0;
3323	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3324		return -EIO;
3325	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3326		p = xdr_inline_decode(xdr, 4);
3327		if (unlikely(!p))
3328			return -EIO;
3329		*type = be32_to_cpup(p);
3330		if (*type < NF4REG || *type > NF4NAMEDATTR) {
3331			dprintk("%s: bad type %d\n", __func__, *type);
3332			return -EIO;
3333		}
3334		bitmap[0] &= ~FATTR4_WORD0_TYPE;
3335		ret = NFS_ATTR_FATTR_TYPE;
3336	}
3337	dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3338	return ret;
3339}
3340
3341static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3342				      uint32_t *bitmap, uint32_t *type)
3343{
3344	__be32 *p;
3345
3346	*type = 0;
3347	if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3348		return -EIO;
3349	if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3350		p = xdr_inline_decode(xdr, 4);
3351		if (unlikely(!p))
3352			return -EIO;
3353		*type = be32_to_cpup(p);
3354		bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3355	}
3356	dprintk("%s: expire type=0x%x\n", __func__, *type);
3357	return 0;
3358}
3359
3360static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3361{
3362	__be32 *p;
3363	int ret = 0;
3364
3365	*change = 0;
3366	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3367		return -EIO;
3368	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3369		p = xdr_inline_decode(xdr, 8);
3370		if (unlikely(!p))
3371			return -EIO;
3372		xdr_decode_hyper(p, change);
3373		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3374		ret = NFS_ATTR_FATTR_CHANGE;
3375	}
3376	dprintk("%s: change attribute=%Lu\n", __func__,
3377			(unsigned long long)*change);
3378	return ret;
3379}
3380
3381static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3382{
3383	__be32 *p;
3384	int ret = 0;
3385
3386	*size = 0;
3387	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3388		return -EIO;
3389	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3390		p = xdr_inline_decode(xdr, 8);
3391		if (unlikely(!p))
3392			return -EIO;
3393		xdr_decode_hyper(p, size);
3394		bitmap[0] &= ~FATTR4_WORD0_SIZE;
3395		ret = NFS_ATTR_FATTR_SIZE;
3396	}
3397	dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3398	return ret;
3399}
3400
3401static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3402{
3403	__be32 *p;
3404
3405	*res = 0;
3406	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3407		return -EIO;
3408	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3409		p = xdr_inline_decode(xdr, 4);
3410		if (unlikely(!p))
3411			return -EIO;
3412		*res = be32_to_cpup(p);
3413		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3414	}
3415	dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3416	return 0;
3417}
3418
3419static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3420{
3421	__be32 *p;
3422
3423	*res = 0;
3424	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3425		return -EIO;
3426	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3427		p = xdr_inline_decode(xdr, 4);
3428		if (unlikely(!p))
3429			return -EIO;
3430		*res = be32_to_cpup(p);
3431		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3432	}
3433	dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3434	return 0;
3435}
3436
3437static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3438{
3439	__be32 *p;
3440	int ret = 0;
3441
3442	fsid->major = 0;
3443	fsid->minor = 0;
3444	if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3445		return -EIO;
3446	if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3447		p = xdr_inline_decode(xdr, 16);
3448		if (unlikely(!p))
3449			return -EIO;
3450		p = xdr_decode_hyper(p, &fsid->major);
3451		xdr_decode_hyper(p, &fsid->minor);
3452		bitmap[0] &= ~FATTR4_WORD0_FSID;
3453		ret = NFS_ATTR_FATTR_FSID;
3454	}
3455	dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3456			(unsigned long long)fsid->major,
3457			(unsigned long long)fsid->minor);
3458	return ret;
3459}
3460
3461static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3462{
3463	__be32 *p;
3464
3465	*res = 60;
3466	if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3467		return -EIO;
3468	if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3469		p = xdr_inline_decode(xdr, 4);
3470		if (unlikely(!p))
3471			return -EIO;
3472		*res = be32_to_cpup(p);
3473		bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3474	}
3475	dprintk("%s: lease time=%u\n", __func__, (unsigned int)*res);
3476	return 0;
3477}
3478
3479static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3480{
3481	__be32 *p;
3482
3483	if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3484		return -EIO;
3485	if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3486		p = xdr_inline_decode(xdr, 4);
3487		if (unlikely(!p))
3488			return -EIO;
3489		bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3490		*res = -be32_to_cpup(p);
3491	}
3492	return 0;
3493}
3494
3495static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
3496				 uint32_t *bitmap, uint32_t *bitmask)
3497{
3498	if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
3499		int ret;
3500		ret = decode_attr_bitmap(xdr, bitmask);
3501		if (unlikely(ret < 0))
3502			return ret;
3503		bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3504	} else
3505		bitmask[0] = bitmask[1] = bitmask[2] = 0;
3506	dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3507		bitmask[0], bitmask[1], bitmask[2]);
3508	return 0;
3509}
3510
3511static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3512{
3513	__be32 *p;
3514	u32 len;
3515
3516	if (fh != NULL)
3517		memset(fh, 0, sizeof(*fh));
3518
3519	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3520		return -EIO;
3521	if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3522		p = xdr_inline_decode(xdr, 4);
3523		if (unlikely(!p))
3524			return -EIO;
3525		len = be32_to_cpup(p);
3526		if (len > NFS4_FHSIZE || len == 0) {
3527			trace_nfs4_xdr_bad_filehandle(xdr, OP_READDIR,
3528						      NFS4ERR_BADHANDLE);
3529			return -EREMOTEIO;
3530		}
3531		p = xdr_inline_decode(xdr, len);
3532		if (unlikely(!p))
3533			return -EIO;
3534		if (fh != NULL) {
3535			memcpy(fh->data, p, len);
3536			fh->size = len;
3537		}
3538		bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3539	}
3540	return 0;
3541}
3542
3543static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3544{
3545	__be32 *p;
3546
3547	*res = 0;
3548	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3549		return -EIO;
3550	if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3551		p = xdr_inline_decode(xdr, 4);
3552		if (unlikely(!p))
3553			return -EIO;
3554		*res = be32_to_cpup(p);
3555		bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3556	}
3557	dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3558	return 0;
3559}
3560
3561static int decode_attr_case_insensitive(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3562{
3563	__be32 *p;
3564
3565	*res = 0;
3566	if (unlikely(bitmap[0] & (FATTR4_WORD0_CASE_INSENSITIVE - 1U)))
3567		return -EIO;
3568	if (likely(bitmap[0] & FATTR4_WORD0_CASE_INSENSITIVE)) {
3569		p = xdr_inline_decode(xdr, 4);
3570		if (unlikely(!p))
3571			return -EIO;
3572		*res = be32_to_cpup(p);
3573		bitmap[0] &= ~FATTR4_WORD0_CASE_INSENSITIVE;
3574	}
3575	dprintk("%s: case_insensitive=%s\n", __func__, *res == 0 ? "false" : "true");
3576	return 0;
3577}
3578
3579static int decode_attr_case_preserving(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3580{
3581	__be32 *p;
3582
3583	*res = 0;
3584	if (unlikely(bitmap[0] & (FATTR4_WORD0_CASE_PRESERVING - 1U)))
3585		return -EIO;
3586	if (likely(bitmap[0] & FATTR4_WORD0_CASE_PRESERVING)) {
3587		p = xdr_inline_decode(xdr, 4);
3588		if (unlikely(!p))
3589			return -EIO;
3590		*res = be32_to_cpup(p);
3591		bitmap[0] &= ~FATTR4_WORD0_CASE_PRESERVING;
3592	}
3593	dprintk("%s: case_preserving=%s\n", __func__, *res == 0 ? "false" : "true");
3594	return 0;
3595}
3596
3597static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3598{
3599	__be32 *p;
3600	int ret = 0;
3601
3602	*fileid = 0;
3603	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3604		return -EIO;
3605	if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3606		p = xdr_inline_decode(xdr, 8);
3607		if (unlikely(!p))
3608			return -EIO;
3609		xdr_decode_hyper(p, fileid);
3610		bitmap[0] &= ~FATTR4_WORD0_FILEID;
3611		ret = NFS_ATTR_FATTR_FILEID;
3612	}
3613	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3614	return ret;
3615}
3616
3617static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3618{
3619	__be32 *p;
3620	int ret = 0;
3621
3622	*fileid = 0;
3623	if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3624		return -EIO;
3625	if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3626		p = xdr_inline_decode(xdr, 8);
3627		if (unlikely(!p))
3628			return -EIO;
3629		xdr_decode_hyper(p, fileid);
3630		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3631		ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3632	}
3633	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3634	return ret;
3635}
3636
3637static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3638{
3639	__be32 *p;
3640	int status = 0;
3641
3642	*res = 0;
3643	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3644		return -EIO;
3645	if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3646		p = xdr_inline_decode(xdr, 8);
3647		if (unlikely(!p))
3648			return -EIO;
3649		xdr_decode_hyper(p, res);
3650		bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3651	}
3652	dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3653	return status;
3654}
3655
3656static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3657{
3658	__be32 *p;
3659	int status = 0;
3660
3661	*res = 0;
3662	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3663		return -EIO;
3664	if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3665		p = xdr_inline_decode(xdr, 8);
3666		if (unlikely(!p))
3667			return -EIO;
3668		xdr_decode_hyper(p, res);
3669		bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3670	}
3671	dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3672	return status;
3673}
3674
3675static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3676{
3677	__be32 *p;
3678	int status = 0;
3679
3680	*res = 0;
3681	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3682		return -EIO;
3683	if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3684		p = xdr_inline_decode(xdr, 8);
3685		if (unlikely(!p))
3686			return -EIO;
3687		xdr_decode_hyper(p, res);
3688		bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3689	}
3690	dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3691	return status;
3692}
3693
3694static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3695{
3696	u32 n;
3697	__be32 *p;
3698	int status = 0;
3699
3700	p = xdr_inline_decode(xdr, 4);
3701	if (unlikely(!p))
3702		return -EIO;
3703	n = be32_to_cpup(p);
3704	if (n == 0)
3705		goto root_path;
3706	dprintk("pathname4: ");
3707	if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3708		dprintk("cannot parse %d components in path\n", n);
3709		goto out_eio;
3710	}
3711	for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3712		struct nfs4_string *component = &path->components[path->ncomponents];
3713		status = decode_opaque_inline(xdr, &component->len, &component->data);
3714		if (unlikely(status != 0))
3715			goto out_eio;
3716		ifdebug (XDR)
3717			pr_cont("%s%.*s ",
3718				(path->ncomponents != n ? "/ " : ""),
3719				component->len, component->data);
3720	}
3721out:
3722	return status;
3723root_path:
3724/* a root pathname is sent as a zero component4 */
3725	path->ncomponents = 1;
3726	path->components[0].len=0;
3727	path->components[0].data=NULL;
3728	dprintk("pathname4: /\n");
3729	goto out;
3730out_eio:
3731	dprintk(" status %d", status);
3732	status = -EIO;
3733	goto out;
3734}
3735
3736static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3737{
3738	int n;
3739	__be32 *p;
3740	int status = -EIO;
3741
3742	if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3743		goto out;
3744	status = 0;
3745	if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3746		goto out;
3747	bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
3748	status = -EIO;
3749	/* Ignore borken servers that return unrequested attrs */
3750	if (unlikely(res == NULL))
3751		goto out;
3752	dprintk("%s: fsroot:\n", __func__);
3753	status = decode_pathname(xdr, &res->fs_path);
3754	if (unlikely(status != 0))
3755		goto out;
3756	p = xdr_inline_decode(xdr, 4);
3757	if (unlikely(!p))
3758		goto out_eio;
3759	n = be32_to_cpup(p);
3760	for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3761		u32 m;
3762		struct nfs4_fs_location *loc;
3763
3764		if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3765			break;
3766		loc = &res->locations[res->nlocations];
3767		p = xdr_inline_decode(xdr, 4);
3768		if (unlikely(!p))
3769			goto out_eio;
3770		m = be32_to_cpup(p);
3771
3772		dprintk("%s: servers:\n", __func__);
3773		for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3774			struct nfs4_string *server;
3775
3776			if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3777				unsigned int i;
3778				dprintk("%s: using first %u of %u servers "
3779					"returned for location %u\n",
3780						__func__,
3781						NFS4_FS_LOCATION_MAXSERVERS,
3782						m, res->nlocations);
3783				for (i = loc->nservers; i < m; i++) {
3784					unsigned int len;
3785					char *data;
3786					status = decode_opaque_inline(xdr, &len, &data);
3787					if (unlikely(status != 0))
3788						goto out_eio;
3789				}
3790				break;
3791			}
3792			server = &loc->servers[loc->nservers];
3793			status = decode_opaque_inline(xdr, &server->len, &server->data);
3794			if (unlikely(status != 0))
3795				goto out_eio;
3796			dprintk("%s ", server->data);
3797		}
3798		status = decode_pathname(xdr, &loc->rootpath);
3799		if (unlikely(status != 0))
3800			goto out_eio;
3801	}
3802	if (res->nlocations != 0)
3803		status = NFS_ATTR_FATTR_V4_LOCATIONS;
3804out:
3805	dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3806	return status;
3807out_eio:
3808	status = -EIO;
3809	goto out;
3810}
3811
3812static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3813{
3814	__be32 *p;
3815	int status = 0;
3816
3817	*res = 0;
3818	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3819		return -EIO;
3820	if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3821		p = xdr_inline_decode(xdr, 8);
3822		if (unlikely(!p))
3823			return -EIO;
3824		xdr_decode_hyper(p, res);
3825		bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3826	}
3827	dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3828	return status;
3829}
3830
3831static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3832{
3833	__be32 *p;
3834	int status = 0;
3835
3836	*maxlink = 1;
3837	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3838		return -EIO;
3839	if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3840		p = xdr_inline_decode(xdr, 4);
3841		if (unlikely(!p))
3842			return -EIO;
3843		*maxlink = be32_to_cpup(p);
3844		bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3845	}
3846	dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3847	return status;
3848}
3849
3850static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3851{
3852	__be32 *p;
3853	int status = 0;
3854
3855	*maxname = 1024;
3856	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3857		return -EIO;
3858	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3859		p = xdr_inline_decode(xdr, 4);
3860		if (unlikely(!p))
3861			return -EIO;
3862		*maxname = be32_to_cpup(p);
3863		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3864	}
3865	dprintk("%s: maxname=%u\n", __func__, *maxname);
3866	return status;
3867}
3868
3869static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3870{
3871	__be32 *p;
3872	int status = 0;
3873
3874	*res = 1024;
3875	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3876		return -EIO;
3877	if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3878		uint64_t maxread;
3879		p = xdr_inline_decode(xdr, 8);
3880		if (unlikely(!p))
3881			return -EIO;
3882		xdr_decode_hyper(p, &maxread);
3883		if (maxread > 0x7FFFFFFF)
3884			maxread = 0x7FFFFFFF;
3885		*res = (uint32_t)maxread;
3886		bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3887	}
3888	dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3889	return status;
3890}
3891
3892static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3893{
3894	__be32 *p;
3895	int status = 0;
3896
3897	*res = 1024;
3898	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3899		return -EIO;
3900	if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3901		uint64_t maxwrite;
3902		p = xdr_inline_decode(xdr, 8);
3903		if (unlikely(!p))
3904			return -EIO;
3905		xdr_decode_hyper(p, &maxwrite);
3906		if (maxwrite > 0x7FFFFFFF)
3907			maxwrite = 0x7FFFFFFF;
3908		*res = (uint32_t)maxwrite;
3909		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3910	}
3911	dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3912	return status;
3913}
3914
3915static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3916{
3917	uint32_t tmp;
3918	__be32 *p;
3919	int ret = 0;
3920
3921	*mode = 0;
3922	if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3923		return -EIO;
3924	if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3925		p = xdr_inline_decode(xdr, 4);
3926		if (unlikely(!p))
3927			return -EIO;
3928		tmp = be32_to_cpup(p);
3929		*mode = tmp & ~S_IFMT;
3930		bitmap[1] &= ~FATTR4_WORD1_MODE;
3931		ret = NFS_ATTR_FATTR_MODE;
3932	}
3933	dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3934	return ret;
3935}
3936
3937static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3938{
3939	__be32 *p;
3940	int ret = 0;
3941
3942	*nlink = 1;
3943	if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3944		return -EIO;
3945	if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3946		p = xdr_inline_decode(xdr, 4);
3947		if (unlikely(!p))
3948			return -EIO;
3949		*nlink = be32_to_cpup(p);
3950		bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3951		ret = NFS_ATTR_FATTR_NLINK;
3952	}
3953	dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3954	return ret;
3955}
3956
3957static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
3958		struct nfs4_string *name, gfp_t gfp_flags)
3959{
3960	ssize_t ret;
3961
3962	ret = xdr_stream_decode_string_dup(xdr, &name->data,
3963			XDR_MAX_NETOBJ, gfp_flags);
3964	name->len = 0;
3965	if (ret > 0)
3966		name->len = ret;
3967	return ret;
3968}
3969
3970static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3971		const struct nfs_server *server, kuid_t *uid,
3972		struct nfs4_string *owner_name)
3973{
3974	ssize_t len;
3975	char *p;
3976
3977	*uid = make_kuid(&init_user_ns, -2);
3978	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3979		return -EIO;
3980	if (!(bitmap[1] & FATTR4_WORD1_OWNER))
3981		return 0;
3982	bitmap[1] &= ~FATTR4_WORD1_OWNER;
3983
3984	if (owner_name != NULL) {
3985		len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
3986		if (len <= 0)
3987			goto out;
3988		dprintk("%s: name=%s\n", __func__, owner_name->data);
3989		return NFS_ATTR_FATTR_OWNER_NAME;
3990	} else {
3991		len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3992				XDR_MAX_NETOBJ);
3993		if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
3994			goto out;
3995		dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3996		return NFS_ATTR_FATTR_OWNER;
3997	}
3998out:
3999	if (len == -EBADMSG)
4000		return -EIO;
4001	return 0;
4002}
4003
4004static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
4005		const struct nfs_server *server, kgid_t *gid,
4006		struct nfs4_string *group_name)
4007{
4008	ssize_t len;
4009	char *p;
4010
4011	*gid = make_kgid(&init_user_ns, -2);
4012	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
4013		return -EIO;
4014	if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
4015		return 0;
4016	bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
4017
4018	if (group_name != NULL) {
4019		len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
4020		if (len <= 0)
4021			goto out;
4022		dprintk("%s: name=%s\n", __func__, group_name->data);
4023		return NFS_ATTR_FATTR_GROUP_NAME;
4024	} else {
4025		len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
4026				XDR_MAX_NETOBJ);
4027		if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
4028			goto out;
4029		dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
4030		return NFS_ATTR_FATTR_GROUP;
4031	}
4032out:
4033	if (len == -EBADMSG)
4034		return -EIO;
4035	return 0;
4036}
4037
4038static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
4039{
4040	uint32_t major = 0, minor = 0;
4041	__be32 *p;
4042	int ret = 0;
4043
4044	*rdev = MKDEV(0,0);
4045	if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
4046		return -EIO;
4047	if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
4048		dev_t tmp;
4049
4050		p = xdr_inline_decode(xdr, 8);
4051		if (unlikely(!p))
4052			return -EIO;
4053		major = be32_to_cpup(p++);
4054		minor = be32_to_cpup(p);
4055		tmp = MKDEV(major, minor);
4056		if (MAJOR(tmp) == major && MINOR(tmp) == minor)
4057			*rdev = tmp;
4058		bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
4059		ret = NFS_ATTR_FATTR_RDEV;
4060	}
4061	dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
4062	return ret;
4063}
4064
4065static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4066{
4067	__be32 *p;
4068	int status = 0;
4069
4070	*res = 0;
4071	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
4072		return -EIO;
4073	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
4074		p = xdr_inline_decode(xdr, 8);
4075		if (unlikely(!p))
4076			return -EIO;
4077		xdr_decode_hyper(p, res);
4078		bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
4079	}
4080	dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
4081	return status;
4082}
4083
4084static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4085{
4086	__be32 *p;
4087	int status = 0;
4088
4089	*res = 0;
4090	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
4091		return -EIO;
4092	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
4093		p = xdr_inline_decode(xdr, 8);
4094		if (unlikely(!p))
4095			return -EIO;
4096		xdr_decode_hyper(p, res);
4097		bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
4098	}
4099	dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
4100	return status;
4101}
4102
4103static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4104{
4105	__be32 *p;
4106	int status = 0;
4107
4108	*res = 0;
4109	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4110		return -EIO;
4111	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4112		p = xdr_inline_decode(xdr, 8);
4113		if (unlikely(!p))
4114			return -EIO;
4115		xdr_decode_hyper(p, res);
4116		bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4117	}
4118	dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4119	return status;
4120}
4121
4122static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4123{
4124	__be32 *p;
4125	int ret = 0;
4126
4127	*used = 0;
4128	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4129		return -EIO;
4130	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4131		p = xdr_inline_decode(xdr, 8);
4132		if (unlikely(!p))
4133			return -EIO;
4134		xdr_decode_hyper(p, used);
4135		bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4136		ret = NFS_ATTR_FATTR_SPACE_USED;
4137	}
4138	dprintk("%s: space used=%Lu\n", __func__,
4139			(unsigned long long)*used);
4140	return ret;
4141}
4142
4143static __be32 *
4144xdr_decode_nfstime4(__be32 *p, struct timespec64 *t)
4145{
4146	__u64 sec;
4147
4148	p = xdr_decode_hyper(p, &sec);
4149	t-> tv_sec = sec;
4150	t->tv_nsec = be32_to_cpup(p++);
4151	return p;
4152}
4153
4154static int decode_attr_time(struct xdr_stream *xdr, struct timespec64 *time)
4155{
4156	__be32 *p;
4157
4158	p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
4159	if (unlikely(!p))
4160		return -EIO;
4161	xdr_decode_nfstime4(p, time);
4162	return 0;
4163}
4164
4165static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
4166{
4167	int status = 0;
4168
4169	time->tv_sec = 0;
4170	time->tv_nsec = 0;
4171	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4172		return -EIO;
4173	if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4174		status = decode_attr_time(xdr, time);
4175		if (status == 0)
4176			status = NFS_ATTR_FATTR_ATIME;
4177		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4178	}
4179	dprintk("%s: atime=%lld\n", __func__, time->tv_sec);
4180	return status;
4181}
4182
4183static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
4184{
4185	int status = 0;
4186
4187	time->tv_sec = 0;
4188	time->tv_nsec = 0;
4189	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4190		return -EIO;
4191	if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4192		status = decode_attr_time(xdr, time);
4193		if (status == 0)
4194			status = NFS_ATTR_FATTR_CTIME;
4195		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4196	}
4197	dprintk("%s: ctime=%lld\n", __func__, time->tv_sec);
4198	return status;
4199}
4200
4201static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4202				  struct timespec64 *time)
4203{
4204	int status = 0;
4205
4206	time->tv_sec = 0;
4207	time->tv_nsec = 0;
4208	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4209		return -EIO;
4210	if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4211		status = decode_attr_time(xdr, time);
4212		bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4213	}
4214	dprintk("%s: time_delta=%lld %ld\n", __func__, time->tv_sec,
4215		time->tv_nsec);
4216	return status;
4217}
4218
4219static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4220					struct nfs4_label *label)
4221{
4222	uint32_t pi = 0;
4223	uint32_t lfs = 0;
4224	__u32 len;
4225	__be32 *p;
4226	int status = 0;
4227
4228	if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4229		return -EIO;
4230	if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4231		p = xdr_inline_decode(xdr, 4);
4232		if (unlikely(!p))
4233			return -EIO;
4234		lfs = be32_to_cpup(p++);
4235		p = xdr_inline_decode(xdr, 4);
4236		if (unlikely(!p))
4237			return -EIO;
4238		pi = be32_to_cpup(p++);
4239		p = xdr_inline_decode(xdr, 4);
4240		if (unlikely(!p))
4241			return -EIO;
4242		len = be32_to_cpup(p++);
4243		p = xdr_inline_decode(xdr, len);
4244		if (unlikely(!p))
4245			return -EIO;
4246		bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4247		if (len < NFS4_MAXLABELLEN) {
4248			if (label && label->len) {
4249				if (label->len < len)
4250					return -ERANGE;
4251				memcpy(label->label, p, len);
4252				label->len = len;
4253				label->pi = pi;
4254				label->lfs = lfs;
4255				status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4256			}
4257		} else
4258			printk(KERN_WARNING "%s: label too long (%u)!\n",
4259					__func__, len);
4260		if (label && label->label)
4261			dprintk("%s: label=%.*s, len=%d, PI=%d, LFS=%d\n",
4262				__func__, label->len, (char *)label->label,
4263				label->len, label->pi, label->lfs);
4264	}
4265	return status;
4266}
4267
4268static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
4269{
4270	int status = 0;
4271
4272	time->tv_sec = 0;
4273	time->tv_nsec = 0;
4274	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4275		return -EIO;
4276	if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4277		status = decode_attr_time(xdr, time);
4278		if (status == 0)
4279			status = NFS_ATTR_FATTR_MTIME;
4280		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4281	}
4282	dprintk("%s: mtime=%lld\n", __func__, time->tv_sec);
4283	return status;
4284}
4285
4286static int decode_attr_xattrsupport(struct xdr_stream *xdr, uint32_t *bitmap,
4287				    uint32_t *res)
4288{
4289	__be32 *p;
4290
4291	*res = 0;
4292	if (unlikely(bitmap[2] & (FATTR4_WORD2_XATTR_SUPPORT - 1U)))
4293		return -EIO;
4294	if (likely(bitmap[2] & FATTR4_WORD2_XATTR_SUPPORT)) {
4295		p = xdr_inline_decode(xdr, 4);
4296		if (unlikely(!p))
4297			return -EIO;
4298		*res = be32_to_cpup(p);
4299		bitmap[2] &= ~FATTR4_WORD2_XATTR_SUPPORT;
4300	}
4301	dprintk("%s: XATTR support=%s\n", __func__,
4302		*res == 0 ? "false" : "true");
4303	return 0;
4304}
4305
4306static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4307{
4308	unsigned int attrwords = XDR_QUADLEN(attrlen);
4309	unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4310
4311	if (unlikely(attrwords != nwords)) {
4312		dprintk("%s: server returned incorrect attribute length: "
4313			"%u %c %u\n",
4314				__func__,
4315				attrwords << 2,
4316				(attrwords < nwords) ? '<' : '>',
4317				nwords << 2);
4318		return -EIO;
4319	}
4320	return 0;
4321}
4322
4323static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4324{
4325	__be32 *p;
4326
4327	p = xdr_inline_decode(xdr, 20);
4328	if (unlikely(!p))
4329		return -EIO;
4330	cinfo->atomic = be32_to_cpup(p++);
4331	p = xdr_decode_hyper(p, &cinfo->before);
4332	xdr_decode_hyper(p, &cinfo->after);
4333	return 0;
4334}
4335
4336static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4337{
4338	__be32 *p;
4339	uint32_t supp, acc;
4340	int status;
4341
4342	status = decode_op_hdr(xdr, OP_ACCESS);
4343	if (status)
4344		return status;
4345	p = xdr_inline_decode(xdr, 8);
4346	if (unlikely(!p))
4347		return -EIO;
4348	supp = be32_to_cpup(p++);
4349	acc = be32_to_cpup(p);
4350	*supported = supp;
4351	*access = acc;
4352	return 0;
4353}
4354
4355static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4356{
4357	ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
4358	if (unlikely(ret < 0))
4359		return -EIO;
4360	return 0;
4361}
4362
4363static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4364{
4365	return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4366}
4367
4368static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4369{
4370	stateid->type = NFS4_OPEN_STATEID_TYPE;
4371	return decode_stateid(xdr, stateid);
4372}
4373
4374static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4375{
4376	stateid->type = NFS4_LOCK_STATEID_TYPE;
4377	return decode_stateid(xdr, stateid);
4378}
4379
4380static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4381{
4382	stateid->type = NFS4_DELEGATION_STATEID_TYPE;
4383	return decode_stateid(xdr, stateid);
4384}
4385
4386static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4387{
4388	nfs4_stateid dummy;
4389
4390	nfs4_stateid_copy(stateid, &invalid_stateid);
4391	return decode_stateid(xdr, &dummy);
4392}
4393
4394static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4395{
4396	int status;
4397
4398	status = decode_op_hdr(xdr, OP_CLOSE);
4399	if (status != -EIO)
4400		nfs_increment_open_seqid(status, res->seqid);
4401	if (!status)
4402		status = decode_invalid_stateid(xdr, &res->stateid);
4403	return status;
4404}
4405
4406static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4407{
4408	return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4409}
4410
4411static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4412{
4413	return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4414}
4415
4416static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4417{
4418	struct nfs_writeverf *verf = res->verf;
4419	int status;
4420
4421	status = decode_op_hdr(xdr, OP_COMMIT);
4422	if (!status)
4423		status = decode_write_verifier(xdr, &verf->verifier);
4424	if (!status)
4425		verf->committed = NFS_FILE_SYNC;
4426	return status;
4427}
4428
4429static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4430{
4431	__be32 *p;
4432	uint32_t bmlen;
4433	int status;
4434
4435	status = decode_op_hdr(xdr, OP_CREATE);
4436	if (status)
4437		return status;
4438	if ((status = decode_change_info(xdr, cinfo)))
4439		return status;
4440	p = xdr_inline_decode(xdr, 4);
4441	if (unlikely(!p))
4442		return -EIO;
4443	bmlen = be32_to_cpup(p);
4444	p = xdr_inline_decode(xdr, bmlen << 2);
4445	if (likely(p))
4446		return 0;
4447	return -EIO;
4448}
4449
4450static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4451{
4452	unsigned int savep;
4453	uint32_t attrlen, bitmap[3] = {0};
4454	int status;
4455
4456	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4457		goto xdr_error;
4458	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4459		goto xdr_error;
4460	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4461		goto xdr_error;
4462	if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4463		goto xdr_error;
4464	if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4465						 &res->fh_expire_type)) != 0)
4466		goto xdr_error;
4467	if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4468		goto xdr_error;
4469	if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4470		goto xdr_error;
4471	if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4472		goto xdr_error;
4473	if ((status = decode_attr_case_insensitive(xdr, bitmap, &res->case_insensitive)) != 0)
4474		goto xdr_error;
4475	if ((status = decode_attr_case_preserving(xdr, bitmap, &res->case_preserving)) != 0)
4476		goto xdr_error;
4477	if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
4478				res->exclcreat_bitmask)) != 0)
4479		goto xdr_error;
4480	status = verify_attr_len(xdr, savep, attrlen);
4481xdr_error:
4482	dprintk("%s: xdr returned %d!\n", __func__, -status);
4483	return status;
4484}
4485
4486static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4487{
4488	unsigned int savep;
4489	uint32_t attrlen, bitmap[3] = {0};
4490	int status;
4491
4492	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4493		goto xdr_error;
4494	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4495		goto xdr_error;
4496	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4497		goto xdr_error;
4498
4499	if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4500		goto xdr_error;
4501	if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4502		goto xdr_error;
4503	if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4504		goto xdr_error;
4505
4506	status = -EIO;
4507	if (unlikely(bitmap[0]))
4508		goto xdr_error;
4509
4510	if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4511		goto xdr_error;
4512	if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4513		goto xdr_error;
4514	if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4515		goto xdr_error;
4516
4517	status = verify_attr_len(xdr, savep, attrlen);
4518xdr_error:
4519	dprintk("%s: xdr returned %d!\n", __func__, -status);
4520	return status;
4521}
4522
4523static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4524{
4525	unsigned int savep;
4526	uint32_t attrlen, bitmap[3] = {0};
4527	int status;
4528
4529	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4530		goto xdr_error;
4531	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4532		goto xdr_error;
4533	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4534		goto xdr_error;
4535
4536	if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4537		goto xdr_error;
4538	if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4539		goto xdr_error;
4540
4541	status = verify_attr_len(xdr, savep, attrlen);
4542xdr_error:
4543	dprintk("%s: xdr returned %d!\n", __func__, -status);
4544	return status;
4545}
4546
4547static int decode_threshold_hint(struct xdr_stream *xdr,
4548				  uint32_t *bitmap,
4549				  uint64_t *res,
4550				  uint32_t hint_bit)
4551{
4552	__be32 *p;
4553
4554	*res = 0;
4555	if (likely(bitmap[0] & hint_bit)) {
4556		p = xdr_inline_decode(xdr, 8);
4557		if (unlikely(!p))
4558			return -EIO;
4559		xdr_decode_hyper(p, res);
4560	}
4561	return 0;
4562}
4563
4564static int decode_first_threshold_item4(struct xdr_stream *xdr,
4565					struct nfs4_threshold *res)
4566{
4567	__be32 *p;
4568	unsigned int savep;
4569	uint32_t bitmap[3] = {0,}, attrlen;
4570	int status;
4571
4572	/* layout type */
4573	p = xdr_inline_decode(xdr, 4);
4574	if (unlikely(!p))
4575		return -EIO;
4576	res->l_type = be32_to_cpup(p);
4577
4578	/* thi_hintset bitmap */
4579	status = decode_attr_bitmap(xdr, bitmap);
4580	if (status < 0)
4581		goto xdr_error;
4582
4583	/* thi_hintlist length */
4584	status = decode_attr_length(xdr, &attrlen, &savep);
4585	if (status < 0)
4586		goto xdr_error;
4587	/* thi_hintlist */
4588	status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4589	if (status < 0)
4590		goto xdr_error;
4591	status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4592	if (status < 0)
4593		goto xdr_error;
4594	status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4595				       THRESHOLD_RD_IO);
4596	if (status < 0)
4597		goto xdr_error;
4598	status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4599				       THRESHOLD_WR_IO);
4600	if (status < 0)
4601		goto xdr_error;
4602
4603	status = verify_attr_len(xdr, savep, attrlen);
4604	res->bm = bitmap[0];
4605
4606	dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4607		 __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4608		res->wr_io_sz);
4609xdr_error:
4610	dprintk("%s ret=%d!\n", __func__, status);
4611	return status;
4612}
4613
4614/*
4615 * Thresholds on pNFS direct I/O vrs MDS I/O
4616 */
4617static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4618				    uint32_t *bitmap,
4619				    struct nfs4_threshold *res)
4620{
4621	__be32 *p;
4622	int status = 0;
4623	uint32_t num;
4624
4625	if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4626		return -EIO;
4627	if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4628		/* Did the server return an unrequested attribute? */
4629		if (unlikely(res == NULL))
4630			return -EREMOTEIO;
4631		p = xdr_inline_decode(xdr, 4);
4632		if (unlikely(!p))
4633			return -EIO;
4634		num = be32_to_cpup(p);
4635		if (num == 0)
4636			return 0;
4637		if (num > 1)
4638			printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4639				"drivers per filesystem not supported\n",
4640				__func__);
4641
4642		status = decode_first_threshold_item4(xdr, res);
4643		bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4644	}
4645	return status;
4646}
4647
4648static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4649		struct nfs_fattr *fattr, struct nfs_fh *fh,
4650		struct nfs4_fs_locations *fs_loc, const struct nfs_server *server)
4651{
4652	int status;
4653	umode_t fmode = 0;
4654	uint32_t type;
4655	int32_t err;
4656
4657	status = decode_attr_type(xdr, bitmap, &type);
4658	if (status < 0)
4659		goto xdr_error;
4660	fattr->mode = 0;
4661	if (status != 0) {
4662		fattr->mode |= nfs_type2fmt[type];
4663		fattr->valid |= status;
4664	}
4665
4666	status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4667	if (status < 0)
4668		goto xdr_error;
4669	fattr->valid |= status;
4670
4671	status = decode_attr_size(xdr, bitmap, &fattr->size);
4672	if (status < 0)
4673		goto xdr_error;
4674	fattr->valid |= status;
4675
4676	status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4677	if (status < 0)
4678		goto xdr_error;
4679	fattr->valid |= status;
4680
4681	err = 0;
4682	status = decode_attr_error(xdr, bitmap, &err);
4683	if (status < 0)
4684		goto xdr_error;
4685
4686	status = decode_attr_filehandle(xdr, bitmap, fh);
4687	if (status < 0)
4688		goto xdr_error;
4689
4690	status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4691	if (status < 0)
4692		goto xdr_error;
4693	fattr->valid |= status;
4694
4695	status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4696	if (status < 0)
4697		goto xdr_error;
4698	fattr->valid |= status;
4699
4700	status = -EIO;
4701	if (unlikely(bitmap[0]))
4702		goto xdr_error;
4703
4704	status = decode_attr_mode(xdr, bitmap, &fmode);
4705	if (status < 0)
4706		goto xdr_error;
4707	if (status != 0) {
4708		fattr->mode |= fmode;
4709		fattr->valid |= status;
4710	}
4711
4712	status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4713	if (status < 0)
4714		goto xdr_error;
4715	fattr->valid |= status;
4716
4717	status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4718	if (status < 0)
4719		goto xdr_error;
4720	fattr->valid |= status;
4721
4722	status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4723	if (status < 0)
4724		goto xdr_error;
4725	fattr->valid |= status;
4726
4727	status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4728	if (status < 0)
4729		goto xdr_error;
4730	fattr->valid |= status;
4731
4732	status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4733	if (status < 0)
4734		goto xdr_error;
4735	fattr->valid |= status;
4736
4737	status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4738	if (status < 0)
4739		goto xdr_error;
4740	fattr->valid |= status;
4741
4742	status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4743	if (status < 0)
4744		goto xdr_error;
4745	fattr->valid |= status;
4746
4747	status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4748	if (status < 0)
4749		goto xdr_error;
4750	fattr->valid |= status;
4751
4752	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4753	if (status < 0)
4754		goto xdr_error;
4755	fattr->valid |= status;
4756
4757	status = -EIO;
4758	if (unlikely(bitmap[1]))
4759		goto xdr_error;
4760
4761	status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4762	if (status < 0)
4763		goto xdr_error;
4764
4765	status = decode_attr_security_label(xdr, bitmap, fattr->label);
4766	if (status < 0)
4767		goto xdr_error;
4768	fattr->valid |= status;
4769
4770xdr_error:
4771	dprintk("%s: xdr returned %d\n", __func__, -status);
4772	return status;
4773}
4774
4775static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4776		struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4777		const struct nfs_server *server)
4778{
4779	unsigned int savep;
4780	uint32_t attrlen,
4781		 bitmap[3] = {0};
4782	int status;
4783
4784	status = decode_op_hdr(xdr, OP_GETATTR);
4785	if (status < 0)
4786		goto xdr_error;
4787
4788	status = decode_attr_bitmap(xdr, bitmap);
4789	if (status < 0)
4790		goto xdr_error;
4791
4792	status = decode_attr_length(xdr, &attrlen, &savep);
4793	if (status < 0)
4794		goto xdr_error;
4795
4796	status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc, server);
4797	if (status < 0)
4798		goto xdr_error;
4799
4800	status = verify_attr_len(xdr, savep, attrlen);
4801xdr_error:
4802	dprintk("%s: xdr returned %d\n", __func__, -status);
4803	return status;
4804}
4805
4806static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4807		const struct nfs_server *server)
4808{
4809	return decode_getfattr_generic(xdr, fattr, NULL, NULL, server);
4810}
4811
4812/*
4813 * Decode potentially multiple layout types.
4814 */
4815static int decode_pnfs_layout_types(struct xdr_stream *xdr,
4816				    struct nfs_fsinfo *fsinfo)
4817{
4818	__be32 *p;
4819	uint32_t i;
4820
4821	p = xdr_inline_decode(xdr, 4);
4822	if (unlikely(!p))
4823		return -EIO;
4824	fsinfo->nlayouttypes = be32_to_cpup(p);
4825
4826	/* pNFS is not supported by the underlying file system */
4827	if (fsinfo->nlayouttypes == 0)
4828		return 0;
4829
4830	/* Decode and set first layout type, move xdr->p past unused types */
4831	p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
4832	if (unlikely(!p))
4833		return -EIO;
4834
4835	/* If we get too many, then just cap it at the max */
4836	if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
4837		printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
4838			__func__, fsinfo->nlayouttypes);
4839		fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
4840	}
4841
4842	for(i = 0; i < fsinfo->nlayouttypes; ++i)
4843		fsinfo->layouttype[i] = be32_to_cpup(p++);
4844	return 0;
4845}
4846
4847/*
4848 * The type of file system exported.
4849 * Note we must ensure that layouttype is set in any non-error case.
4850 */
4851static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4852				struct nfs_fsinfo *fsinfo)
4853{
4854	int status = 0;
4855
4856	dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4857	if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4858		return -EIO;
4859	if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4860		status = decode_pnfs_layout_types(xdr, fsinfo);
4861		bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4862	}
4863	return status;
4864}
4865
4866/*
4867 * The prefered block size for layout directed io
4868 */
4869static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4870				      uint32_t *res)
4871{
4872	__be32 *p;
4873
4874	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4875	*res = 0;
4876	if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4877		p = xdr_inline_decode(xdr, 4);
4878		if (unlikely(!p))
4879			return -EIO;
4880		*res = be32_to_cpup(p);
4881		bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4882	}
4883	return 0;
4884}
4885
4886/*
4887 * The granularity of a CLONE operation.
4888 */
4889static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4890				     uint32_t *res)
4891{
4892	__be32 *p;
4893
4894	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4895	*res = 0;
4896	if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
4897		p = xdr_inline_decode(xdr, 4);
4898		if (unlikely(!p))
4899			return -EIO;
4900		*res = be32_to_cpup(p);
4901		bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
4902	}
4903	return 0;
4904}
4905
4906static int decode_attr_change_attr_type(struct xdr_stream *xdr,
4907					uint32_t *bitmap,
4908					enum nfs4_change_attr_type *res)
4909{
4910	u32 tmp = NFS4_CHANGE_TYPE_IS_UNDEFINED;
4911
4912	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4913	if (bitmap[2] & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
4914		if (xdr_stream_decode_u32(xdr, &tmp))
4915			return -EIO;
4916		bitmap[2] &= ~FATTR4_WORD2_CHANGE_ATTR_TYPE;
4917	}
4918
4919	switch(tmp) {
4920	case NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR:
4921	case NFS4_CHANGE_TYPE_IS_VERSION_COUNTER:
4922	case NFS4_CHANGE_TYPE_IS_VERSION_COUNTER_NOPNFS:
4923	case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
4924		*res = tmp;
4925		break;
4926	default:
4927		*res = NFS4_CHANGE_TYPE_IS_UNDEFINED;
4928	}
4929	return 0;
4930}
4931
4932static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4933{
4934	unsigned int savep;
4935	uint32_t attrlen, bitmap[3];
4936	int status;
4937
4938	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4939		goto xdr_error;
4940	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4941		goto xdr_error;
4942	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4943		goto xdr_error;
4944
4945	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */
4946
4947	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4948		goto xdr_error;
4949	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4950		goto xdr_error;
4951	if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4952		goto xdr_error;
4953	fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4954	if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4955		goto xdr_error;
4956	fsinfo->wtpref = fsinfo->wtmax;
4957
4958	status = -EIO;
4959	if (unlikely(bitmap[0]))
4960		goto xdr_error;
4961
4962	status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4963	if (status != 0)
4964		goto xdr_error;
4965	status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
4966	if (status != 0)
4967		goto xdr_error;
4968
4969	status = -EIO;
4970	if (unlikely(bitmap[1]))
4971		goto xdr_error;
4972
4973	status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4974	if (status)
4975		goto xdr_error;
4976	status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
4977	if (status)
4978		goto xdr_error;
4979
4980	status = decode_attr_change_attr_type(xdr, bitmap,
4981					      &fsinfo->change_attr_type);
4982	if (status)
4983		goto xdr_error;
4984
4985	status = decode_attr_xattrsupport(xdr, bitmap,
4986					  &fsinfo->xattr_support);
4987	if (status)
4988		goto xdr_error;
4989
4990	status = verify_attr_len(xdr, savep, attrlen);
4991xdr_error:
4992	dprintk("%s: xdr returned %d!\n", __func__, -status);
4993	return status;
4994}
4995
4996static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4997{
4998	__be32 *p;
4999	uint32_t len;
5000	int status;
5001
5002	/* Zero handle first to allow comparisons */
5003	memset(fh, 0, sizeof(*fh));
5004
5005	status = decode_op_hdr(xdr, OP_GETFH);
5006	if (status)
5007		return status;
5008
5009	p = xdr_inline_decode(xdr, 4);
5010	if (unlikely(!p))
5011		return -EIO;
5012	len = be32_to_cpup(p);
5013	if (len > NFS4_FHSIZE || len == 0) {
5014		trace_nfs4_xdr_bad_filehandle(xdr, OP_GETFH, NFS4ERR_BADHANDLE);
5015		return -EREMOTEIO;
5016	}
5017	fh->size = len;
5018	p = xdr_inline_decode(xdr, len);
5019	if (unlikely(!p))
5020		return -EIO;
5021	memcpy(fh->data, p, len);
5022	return 0;
5023}
5024
5025static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5026{
5027	int status;
5028
5029	status = decode_op_hdr(xdr, OP_LINK);
5030	if (status)
5031		return status;
5032	return decode_change_info(xdr, cinfo);
5033}
5034
5035/*
5036 * We create the owner, so we know a proper owner.id length is 4.
5037 */
5038static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
5039{
5040	uint64_t offset, length, clientid;
5041	__be32 *p;
5042	uint32_t namelen, type;
5043
5044	p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
5045	if (unlikely(!p))
5046		return -EIO;
5047	p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
5048	p = xdr_decode_hyper(p, &length);
5049	type = be32_to_cpup(p++); /* 4 byte read */
5050	if (fl != NULL) { /* manipulate file lock */
5051		fl->fl_start = (loff_t)offset;
5052		fl->fl_end = fl->fl_start + (loff_t)length - 1;
5053		if (length == ~(uint64_t)0)
5054			fl->fl_end = OFFSET_MAX;
5055		fl->c.flc_type = F_WRLCK;
5056		if (type & 1)
5057			fl->c.flc_type = F_RDLCK;
5058		fl->c.flc_pid = 0;
5059	}
5060	p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
5061	namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
5062	p = xdr_inline_decode(xdr, namelen); /* variable size field */
5063	if (likely(!p))
5064		return -EIO;
5065	return -NFS4ERR_DENIED;
5066}
5067
5068static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
5069{
5070	int status;
5071
5072	status = decode_op_hdr(xdr, OP_LOCK);
5073	if (status == -EIO)
5074		goto out;
5075	if (status == 0) {
5076		status = decode_lock_stateid(xdr, &res->stateid);
5077		if (unlikely(status))
5078			goto out;
5079	} else if (status == -NFS4ERR_DENIED)
5080		status = decode_lock_denied(xdr, NULL);
5081	if (res->open_seqid != NULL)
5082		nfs_increment_open_seqid(status, res->open_seqid);
5083	nfs_increment_lock_seqid(status, res->lock_seqid);
5084out:
5085	return status;
5086}
5087
5088static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
5089{
5090	int status;
5091	status = decode_op_hdr(xdr, OP_LOCKT);
5092	if (status == -NFS4ERR_DENIED)
5093		return decode_lock_denied(xdr, res->denied);
5094	return status;
5095}
5096
5097static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
5098{
5099	int status;
5100
5101	status = decode_op_hdr(xdr, OP_LOCKU);
5102	if (status != -EIO)
5103		nfs_increment_lock_seqid(status, res->seqid);
5104	if (status == 0)
5105		status = decode_lock_stateid(xdr, &res->stateid);
5106	return status;
5107}
5108
5109static int decode_release_lockowner(struct xdr_stream *xdr)
5110{
5111	return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
5112}
5113
5114static int decode_lookup(struct xdr_stream *xdr)
5115{
5116	return decode_op_hdr(xdr, OP_LOOKUP);
5117}
5118
5119static int decode_lookupp(struct xdr_stream *xdr)
5120{
5121	return decode_op_hdr(xdr, OP_LOOKUPP);
5122}
5123
5124/* This is too sick! */
5125static int decode_space_limit(struct xdr_stream *xdr,
5126		unsigned long *pagemod_limit)
5127{
5128	__be32 *p;
5129	uint32_t limit_type, nblocks, blocksize;
5130	u64 maxsize = 0;
5131
5132	p = xdr_inline_decode(xdr, 12);
5133	if (unlikely(!p))
5134		return -EIO;
5135	limit_type = be32_to_cpup(p++);
5136	switch (limit_type) {
5137	case NFS4_LIMIT_SIZE:
5138		xdr_decode_hyper(p, &maxsize);
5139		break;
5140	case NFS4_LIMIT_BLOCKS:
5141		nblocks = be32_to_cpup(p++);
5142		blocksize = be32_to_cpup(p);
5143		maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
5144	}
5145	maxsize >>= PAGE_SHIFT;
5146	*pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
5147	return 0;
5148}
5149
5150static int decode_rw_delegation(struct xdr_stream *xdr,
5151		uint32_t delegation_type,
5152		struct nfs_openres *res)
5153{
5154	__be32 *p;
5155	int status;
5156
5157	status = decode_delegation_stateid(xdr, &res->delegation);
5158	if (unlikely(status))
5159		return status;
5160	p = xdr_inline_decode(xdr, 4);
5161	if (unlikely(!p))
5162		return -EIO;
5163	res->do_recall = be32_to_cpup(p);
5164
5165	switch (delegation_type) {
5166	case NFS4_OPEN_DELEGATE_READ:
5167		res->delegation_type = FMODE_READ;
5168		break;
5169	case NFS4_OPEN_DELEGATE_WRITE:
5170		res->delegation_type = FMODE_WRITE|FMODE_READ;
5171		if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
5172				return -EIO;
5173	}
5174	return decode_ace(xdr, NULL);
5175}
5176
5177static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5178{
5179	__be32 *p;
5180	uint32_t why_no_delegation;
5181
5182	p = xdr_inline_decode(xdr, 4);
5183	if (unlikely(!p))
5184		return -EIO;
5185	why_no_delegation = be32_to_cpup(p);
5186	switch (why_no_delegation) {
5187		case WND4_CONTENTION:
5188		case WND4_RESOURCE:
5189			xdr_inline_decode(xdr, 4);
5190			/* Ignore for now */
5191	}
5192	return 0;
5193}
5194
5195static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5196{
5197	__be32 *p;
5198	uint32_t delegation_type;
5199
5200	p = xdr_inline_decode(xdr, 4);
5201	if (unlikely(!p))
5202		return -EIO;
5203	delegation_type = be32_to_cpup(p);
5204	res->delegation_type = 0;
5205	switch (delegation_type) {
5206	case NFS4_OPEN_DELEGATE_NONE:
5207		return 0;
5208	case NFS4_OPEN_DELEGATE_READ:
5209	case NFS4_OPEN_DELEGATE_WRITE:
5210		return decode_rw_delegation(xdr, delegation_type, res);
5211	case NFS4_OPEN_DELEGATE_NONE_EXT:
5212		return decode_no_delegation(xdr, res);
5213	}
5214	return -EIO;
5215}
5216
5217static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5218{
5219	__be32 *p;
5220	uint32_t savewords, bmlen, i;
5221	int status;
5222
5223	if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5224		return status;
5225	nfs_increment_open_seqid(status, res->seqid);
5226	if (status)
5227		return status;
5228	status = decode_open_stateid(xdr, &res->stateid);
5229	if (unlikely(status))
5230		return status;
5231
5232	decode_change_info(xdr, &res->cinfo);
5233
5234	p = xdr_inline_decode(xdr, 8);
5235	if (unlikely(!p))
5236		return -EIO;
5237	res->rflags = be32_to_cpup(p++);
5238	bmlen = be32_to_cpup(p);
5239	if (bmlen > 10)
5240		goto xdr_error;
5241
5242	p = xdr_inline_decode(xdr, bmlen << 2);
5243	if (unlikely(!p))
5244		return -EIO;
5245	savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5246	for (i = 0; i < savewords; ++i)
5247		res->attrset[i] = be32_to_cpup(p++);
5248	for (; i < NFS4_BITMAP_SIZE; i++)
5249		res->attrset[i] = 0;
5250
5251	return decode_delegation(xdr, res);
5252xdr_error:
5253	dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5254	return -EIO;
5255}
5256
5257static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5258{
5259	int status;
5260
5261	status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5262	if (status != -EIO)
5263		nfs_increment_open_seqid(status, res->seqid);
5264	if (!status)
5265		status = decode_open_stateid(xdr, &res->stateid);
5266	return status;
5267}
5268
5269static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5270{
5271	int status;
5272
5273	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5274	if (status != -EIO)
5275		nfs_increment_open_seqid(status, res->seqid);
5276	if (!status)
5277		status = decode_open_stateid(xdr, &res->stateid);
5278	return status;
5279}
5280
5281static int decode_putfh(struct xdr_stream *xdr)
5282{
5283	return decode_op_hdr(xdr, OP_PUTFH);
5284}
5285
5286static int decode_putrootfh(struct xdr_stream *xdr)
5287{
5288	return decode_op_hdr(xdr, OP_PUTROOTFH);
5289}
5290
5291static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5292		       struct nfs_pgio_res *res)
5293{
5294	__be32 *p;
5295	uint32_t count, eof, recvd;
5296	int status;
5297
5298	status = decode_op_hdr(xdr, OP_READ);
5299	if (status)
5300		return status;
5301	p = xdr_inline_decode(xdr, 8);
5302	if (unlikely(!p))
5303		return -EIO;
5304	eof = be32_to_cpup(p++);
5305	count = be32_to_cpup(p);
5306	recvd = xdr_read_pages(xdr, count);
5307	if (count > recvd) {
5308		dprintk("NFS: server cheating in read reply: "
5309				"count %u > recvd %u\n", count, recvd);
5310		count = recvd;
5311		eof = 0;
5312	}
5313	res->eof = eof;
5314	res->count = count;
5315	return 0;
5316}
5317
5318static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5319{
5320	int		status;
5321	__be32		verf[2];
5322
5323	status = decode_op_hdr(xdr, OP_READDIR);
5324	if (!status)
5325		status = decode_verifier(xdr, readdir->verifier.data);
5326	if (unlikely(status))
5327		return status;
5328	memcpy(verf, readdir->verifier.data, sizeof(verf));
5329	dprintk("%s: verifier = %08x:%08x\n",
5330			__func__, verf[0], verf[1]);
5331	return xdr_read_pages(xdr, xdr->buf->page_len);
5332}
5333
5334static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5335{
5336	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5337	u32 len, recvd;
5338	__be32 *p;
5339	int status;
5340
5341	status = decode_op_hdr(xdr, OP_READLINK);
5342	if (status)
5343		return status;
5344
5345	/* Convert length of symlink */
5346	p = xdr_inline_decode(xdr, 4);
5347	if (unlikely(!p))
5348		return -EIO;
5349	len = be32_to_cpup(p);
5350	if (len >= rcvbuf->page_len || len <= 0) {
5351		dprintk("nfs: server returned giant symlink!\n");
5352		return -ENAMETOOLONG;
5353	}
5354	recvd = xdr_read_pages(xdr, len);
5355	if (recvd < len) {
5356		dprintk("NFS: server cheating in readlink reply: "
5357				"count %u > recvd %u\n", len, recvd);
5358		return -EIO;
5359	}
5360	/*
5361	 * The XDR encode routine has set things up so that
5362	 * the link text will be copied directly into the
5363	 * buffer.  We just have to do overflow-checking,
5364	 * and null-terminate the text (the VFS expects
5365	 * null-termination).
5366	 */
5367	xdr_terminate_string(rcvbuf, len);
5368	return 0;
5369}
5370
5371static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5372{
5373	int status;
5374
5375	status = decode_op_hdr(xdr, OP_REMOVE);
5376	if (status)
5377		goto out;
5378	status = decode_change_info(xdr, cinfo);
5379out:
5380	return status;
5381}
5382
5383static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5384	      struct nfs4_change_info *new_cinfo)
5385{
5386	int status;
5387
5388	status = decode_op_hdr(xdr, OP_RENAME);
5389	if (status)
5390		goto out;
5391	if ((status = decode_change_info(xdr, old_cinfo)))
5392		goto out;
5393	status = decode_change_info(xdr, new_cinfo);
5394out:
5395	return status;
5396}
5397
5398static int decode_renew(struct xdr_stream *xdr)
5399{
5400	return decode_op_hdr(xdr, OP_RENEW);
5401}
5402
5403static int
5404decode_restorefh(struct xdr_stream *xdr)
5405{
5406	return decode_op_hdr(xdr, OP_RESTOREFH);
5407}
5408
5409static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5410			 struct nfs_getaclres *res, enum nfs4_acl_type type)
5411{
5412	unsigned int savep;
5413	uint32_t attrlen,
5414		 bitmap[3] = {0};
5415	int status;
5416
5417	res->acl_len = 0;
5418	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5419		goto out;
5420
5421	xdr_enter_page(xdr, xdr->buf->page_len);
5422
5423	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5424		goto out;
5425	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5426		goto out;
5427
5428	switch (type) {
5429	default:
5430		if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5431			return -EIO;
5432		if (!(bitmap[0] & FATTR4_WORD0_ACL))
5433			return -EOPNOTSUPP;
5434		break;
5435	case NFS4ACL_DACL:
5436		if (unlikely(bitmap[0] || bitmap[1] & (FATTR4_WORD1_DACL - 1U)))
5437			return -EIO;
5438		if (!(bitmap[1] & FATTR4_WORD1_DACL))
5439			return -EOPNOTSUPP;
5440		break;
5441	case NFS4ACL_SACL:
5442		if (unlikely(bitmap[0] || bitmap[1] & (FATTR4_WORD1_SACL - 1U)))
5443			return -EIO;
5444		if (!(bitmap[1] & FATTR4_WORD1_SACL))
5445			return -EOPNOTSUPP;
5446	}
5447
5448	/* The bitmap (xdr len + bitmaps) and the attr xdr len words
5449	 * are stored with the acl data to handle the problem of
5450	 * variable length bitmaps.*/
5451	res->acl_data_offset = xdr_page_pos(xdr);
5452	res->acl_len = attrlen;
5453
5454	/* Check for receive buffer overflow */
5455	if (res->acl_len > xdr_stream_remaining(xdr) ||
5456	    res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5457		res->acl_flags |= NFS4_ACL_TRUNC;
5458		dprintk("NFS: acl reply: attrlen %u > page_len %zu\n",
5459			attrlen, xdr_stream_remaining(xdr));
5460	}
5461out:
5462	return status;
5463}
5464
5465static int
5466decode_savefh(struct xdr_stream *xdr)
5467{
5468	return decode_op_hdr(xdr, OP_SAVEFH);
5469}
5470
5471static int decode_setattr(struct xdr_stream *xdr)
5472{
5473	int status;
5474
5475	status = decode_op_hdr(xdr, OP_SETATTR);
5476	if (status)
5477		return status;
5478	if (decode_bitmap4(xdr, NULL, 0) >= 0)
5479		return 0;
5480	return -EIO;
5481}
5482
5483static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5484{
5485	__be32 *p;
5486	uint32_t opnum;
5487	int32_t nfserr;
5488
5489	p = xdr_inline_decode(xdr, 8);
5490	if (unlikely(!p))
5491		return -EIO;
5492	opnum = be32_to_cpup(p++);
5493	if (opnum != OP_SETCLIENTID) {
5494		dprintk("nfs: decode_setclientid: Server returned operation"
5495			" %d\n", opnum);
5496		return -EIO;
5497	}
5498	nfserr = be32_to_cpup(p);
5499	if (nfserr == NFS_OK) {
5500		p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5501		if (unlikely(!p))
5502			return -EIO;
5503		p = xdr_decode_hyper(p, &res->clientid);
5504		memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5505	} else if (nfserr == NFSERR_CLID_INUSE) {
5506		uint32_t len;
5507
5508		/* skip netid string */
5509		p = xdr_inline_decode(xdr, 4);
5510		if (unlikely(!p))
5511			return -EIO;
5512		len = be32_to_cpup(p);
5513		p = xdr_inline_decode(xdr, len);
5514		if (unlikely(!p))
5515			return -EIO;
5516
5517		/* skip uaddr string */
5518		p = xdr_inline_decode(xdr, 4);
5519		if (unlikely(!p))
5520			return -EIO;
5521		len = be32_to_cpup(p);
5522		p = xdr_inline_decode(xdr, len);
5523		if (unlikely(!p))
5524			return -EIO;
5525		return -NFSERR_CLID_INUSE;
5526	} else
5527		return nfs4_stat_to_errno(nfserr);
5528
5529	return 0;
5530}
5531
5532static int decode_setclientid_confirm(struct xdr_stream *xdr)
5533{
5534	return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5535}
5536
5537static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5538{
5539	__be32 *p;
5540	int status;
5541
5542	status = decode_op_hdr(xdr, OP_WRITE);
5543	if (status)
5544		return status;
5545
5546	p = xdr_inline_decode(xdr, 8);
5547	if (unlikely(!p))
5548		return -EIO;
5549	res->count = be32_to_cpup(p++);
5550	res->verf->committed = be32_to_cpup(p++);
5551	return decode_write_verifier(xdr, &res->verf->verifier);
5552}
5553
5554static int decode_delegreturn(struct xdr_stream *xdr)
5555{
5556	return decode_op_hdr(xdr, OP_DELEGRETURN);
5557}
5558
5559static int decode_secinfo_gss(struct xdr_stream *xdr,
5560			      struct nfs4_secinfo4 *flavor)
5561{
5562	u32 oid_len;
5563	__be32 *p;
5564
5565	p = xdr_inline_decode(xdr, 4);
5566	if (unlikely(!p))
5567		return -EIO;
5568	oid_len = be32_to_cpup(p);
5569	if (oid_len > GSS_OID_MAX_LEN)
5570		return -EINVAL;
5571
5572	p = xdr_inline_decode(xdr, oid_len);
5573	if (unlikely(!p))
5574		return -EIO;
5575	memcpy(flavor->flavor_info.oid.data, p, oid_len);
5576	flavor->flavor_info.oid.len = oid_len;
5577
5578	p = xdr_inline_decode(xdr, 8);
5579	if (unlikely(!p))
5580		return -EIO;
5581	flavor->flavor_info.qop = be32_to_cpup(p++);
5582	flavor->flavor_info.service = be32_to_cpup(p);
5583
5584	return 0;
5585}
5586
5587static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5588{
5589	struct nfs4_secinfo4 *sec_flavor;
5590	unsigned int i, num_flavors;
5591	int status;
5592	__be32 *p;
5593
5594	p = xdr_inline_decode(xdr, 4);
5595	if (unlikely(!p))
5596		return -EIO;
5597
5598	res->flavors->num_flavors = 0;
5599	num_flavors = be32_to_cpup(p);
5600
5601	for (i = 0; i < num_flavors; i++) {
5602		sec_flavor = &res->flavors->flavors[i];
5603		if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5604			break;
5605
5606		p = xdr_inline_decode(xdr, 4);
5607		if (unlikely(!p))
5608			return -EIO;
5609		sec_flavor->flavor = be32_to_cpup(p);
5610
5611		if (sec_flavor->flavor == RPC_AUTH_GSS) {
5612			status = decode_secinfo_gss(xdr, sec_flavor);
5613			if (status)
5614				goto out;
5615		}
5616		res->flavors->num_flavors++;
5617	}
5618
5619	status = 0;
5620out:
5621	return status;
5622}
5623
5624static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5625{
5626	int status = decode_op_hdr(xdr, OP_SECINFO);
5627	if (status)
5628		return status;
5629	return decode_secinfo_common(xdr, res);
5630}
5631
5632#if defined(CONFIG_NFS_V4_1)
5633static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5634{
5635	int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5636	if (status)
5637		return status;
5638	return decode_secinfo_common(xdr, res);
5639}
5640
5641static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5642{
5643	if (xdr_stream_decode_uint32_array(xdr, op_map->u.words,
5644					   ARRAY_SIZE(op_map->u.words)) < 0)
5645		return -EIO;
5646	return 0;
5647}
5648
5649static int decode_exchange_id(struct xdr_stream *xdr,
5650			      struct nfs41_exchange_id_res *res)
5651{
5652	__be32 *p;
5653	uint32_t dummy;
5654	char *dummy_str;
5655	int status;
5656	uint32_t impl_id_count;
5657
5658	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5659	if (status)
5660		return status;
5661
5662	p = xdr_inline_decode(xdr, 8);
5663	if (unlikely(!p))
5664		return -EIO;
5665	xdr_decode_hyper(p, &res->clientid);
5666	p = xdr_inline_decode(xdr, 12);
5667	if (unlikely(!p))
5668		return -EIO;
5669	res->seqid = be32_to_cpup(p++);
5670	res->flags = be32_to_cpup(p++);
5671
5672	res->state_protect.how = be32_to_cpup(p);
5673	switch (res->state_protect.how) {
5674	case SP4_NONE:
5675		break;
5676	case SP4_MACH_CRED:
5677		status = decode_op_map(xdr, &res->state_protect.enforce);
5678		if (status)
5679			return status;
5680		status = decode_op_map(xdr, &res->state_protect.allow);
5681		if (status)
5682			return status;
5683		break;
5684	default:
5685		WARN_ON_ONCE(1);
5686		return -EIO;
5687	}
5688
5689	/* server_owner4.so_minor_id */
5690	p = xdr_inline_decode(xdr, 8);
5691	if (unlikely(!p))
5692		return -EIO;
5693	p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5694
5695	/* server_owner4.so_major_id */
5696	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5697	if (unlikely(status))
5698		return status;
5699	memcpy(res->server_owner->major_id, dummy_str, dummy);
5700	res->server_owner->major_id_sz = dummy;
5701
5702	/* server_scope4 */
5703	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5704	if (unlikely(status))
5705		return status;
5706	memcpy(res->server_scope->server_scope, dummy_str, dummy);
5707	res->server_scope->server_scope_sz = dummy;
5708
5709	/* Implementation Id */
5710	p = xdr_inline_decode(xdr, 4);
5711	if (unlikely(!p))
5712		return -EIO;
5713	impl_id_count = be32_to_cpup(p++);
5714
5715	if (impl_id_count) {
5716		/* nii_domain */
5717		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5718		if (unlikely(status))
5719			return status;
5720		memcpy(res->impl_id->domain, dummy_str, dummy);
5721
5722		/* nii_name */
5723		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5724		if (unlikely(status))
5725			return status;
5726		memcpy(res->impl_id->name, dummy_str, dummy);
5727
5728		/* nii_date */
5729		p = xdr_inline_decode(xdr, 12);
5730		if (unlikely(!p))
5731			return -EIO;
5732		p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5733		res->impl_id->date.nseconds = be32_to_cpup(p);
5734
5735		/* if there's more than one entry, ignore the rest */
5736	}
5737	return 0;
5738}
5739
5740static int decode_chan_attrs(struct xdr_stream *xdr,
5741			     struct nfs4_channel_attrs *attrs)
5742{
5743	__be32 *p;
5744	u32 nr_attrs, val;
5745
5746	p = xdr_inline_decode(xdr, 28);
5747	if (unlikely(!p))
5748		return -EIO;
5749	val = be32_to_cpup(p++);	/* headerpadsz */
5750	if (val)
5751		return -EINVAL;		/* no support for header padding yet */
5752	attrs->max_rqst_sz = be32_to_cpup(p++);
5753	attrs->max_resp_sz = be32_to_cpup(p++);
5754	attrs->max_resp_sz_cached = be32_to_cpup(p++);
5755	attrs->max_ops = be32_to_cpup(p++);
5756	attrs->max_reqs = be32_to_cpup(p++);
5757	nr_attrs = be32_to_cpup(p);
5758	if (unlikely(nr_attrs > 1)) {
5759		printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5760			"count %u\n", __func__, nr_attrs);
5761		return -EINVAL;
5762	}
5763	if (nr_attrs == 1) {
5764		p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5765		if (unlikely(!p))
5766			return -EIO;
5767	}
5768	return 0;
5769}
5770
5771static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5772{
5773	return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5774}
5775
5776static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5777				struct nfs41_bind_conn_to_session_res *res)
5778{
5779	__be32 *p;
5780	int status;
5781
5782	status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5783	if (!status)
5784		status = decode_sessionid(xdr, &res->sessionid);
5785	if (unlikely(status))
5786		return status;
5787
5788	/* dir flags, rdma mode bool */
5789	p = xdr_inline_decode(xdr, 8);
5790	if (unlikely(!p))
5791		return -EIO;
5792
5793	res->dir = be32_to_cpup(p++);
5794	if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5795		return -EIO;
5796	if (be32_to_cpup(p) == 0)
5797		res->use_conn_in_rdma_mode = false;
5798	else
5799		res->use_conn_in_rdma_mode = true;
5800
5801	return 0;
5802}
5803
5804static int decode_create_session(struct xdr_stream *xdr,
5805				 struct nfs41_create_session_res *res)
5806{
5807	__be32 *p;
5808	int status;
5809
5810	status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5811	if (!status)
5812		status = decode_sessionid(xdr, &res->sessionid);
5813	if (unlikely(status))
5814		return status;
5815
5816	/* seqid, flags */
5817	p = xdr_inline_decode(xdr, 8);
5818	if (unlikely(!p))
5819		return -EIO;
5820	res->seqid = be32_to_cpup(p++);
5821	res->flags = be32_to_cpup(p);
5822
5823	/* Channel attributes */
5824	status = decode_chan_attrs(xdr, &res->fc_attrs);
5825	if (!status)
5826		status = decode_chan_attrs(xdr, &res->bc_attrs);
5827	return status;
5828}
5829
5830static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5831{
5832	return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5833}
5834
5835static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5836{
5837	return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5838}
5839
5840static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5841{
5842	return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5843}
5844#endif /* CONFIG_NFS_V4_1 */
5845
5846static int decode_sequence(struct xdr_stream *xdr,
5847			   struct nfs4_sequence_res *res,
5848			   struct rpc_rqst *rqstp)
5849{
5850#if defined(CONFIG_NFS_V4_1)
5851	struct nfs4_session *session;
5852	struct nfs4_sessionid id;
5853	u32 dummy;
5854	int status;
5855	__be32 *p;
5856
5857	if (res->sr_slot == NULL)
5858		return 0;
5859	if (!res->sr_slot->table->session)
5860		return 0;
5861
5862	status = decode_op_hdr(xdr, OP_SEQUENCE);
5863	if (!status)
5864		status = decode_sessionid(xdr, &id);
5865	if (unlikely(status))
5866		goto out_err;
5867
5868	/*
5869	 * If the server returns different values for sessionID, slotID or
5870	 * sequence number, the server is looney tunes.
5871	 */
5872	status = -EREMOTEIO;
5873	session = res->sr_slot->table->session;
5874
5875	if (memcmp(id.data, session->sess_id.data,
5876		   NFS4_MAX_SESSIONID_LEN)) {
5877		dprintk("%s Invalid session id\n", __func__);
5878		goto out_err;
5879	}
5880
5881	p = xdr_inline_decode(xdr, 20);
5882	if (unlikely(!p))
5883		goto out_overflow;
5884
5885	/* seqid */
5886	dummy = be32_to_cpup(p++);
5887	if (dummy != res->sr_slot->seq_nr) {
5888		dprintk("%s Invalid sequence number\n", __func__);
5889		goto out_err;
5890	}
5891	/* slot id */
5892	dummy = be32_to_cpup(p++);
5893	if (dummy != res->sr_slot->slot_nr) {
5894		dprintk("%s Invalid slot id\n", __func__);
5895		goto out_err;
5896	}
5897	/* highest slot id */
5898	res->sr_highest_slotid = be32_to_cpup(p++);
5899	/* target highest slot id */
5900	res->sr_target_highest_slotid = be32_to_cpup(p++);
5901	/* result flags */
5902	res->sr_status_flags = be32_to_cpup(p);
5903	status = 0;
5904out_err:
5905	res->sr_status = status;
5906	return status;
5907out_overflow:
5908	status = -EIO;
5909	goto out_err;
5910#else  /* CONFIG_NFS_V4_1 */
5911	return 0;
5912#endif /* CONFIG_NFS_V4_1 */
5913}
5914
5915#if defined(CONFIG_NFS_V4_1)
5916static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
5917{
5918	stateid->type = NFS4_LAYOUT_STATEID_TYPE;
5919	return decode_stateid(xdr, stateid);
5920}
5921
5922static int decode_getdeviceinfo(struct xdr_stream *xdr,
5923				struct nfs4_getdeviceinfo_res *res)
5924{
5925	struct pnfs_device *pdev = res->pdev;
5926	__be32 *p;
5927	uint32_t len, type;
5928	int status;
5929
5930	status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5931	if (status) {
5932		if (status == -ETOOSMALL) {
5933			p = xdr_inline_decode(xdr, 4);
5934			if (unlikely(!p))
5935				return -EIO;
5936			pdev->mincount = be32_to_cpup(p);
5937			dprintk("%s: Min count too small. mincnt = %u\n",
5938				__func__, pdev->mincount);
5939		}
5940		return status;
5941	}
5942
5943	p = xdr_inline_decode(xdr, 8);
5944	if (unlikely(!p))
5945		return -EIO;
5946	type = be32_to_cpup(p++);
5947	if (type != pdev->layout_type) {
5948		dprintk("%s: layout mismatch req: %u pdev: %u\n",
5949			__func__, pdev->layout_type, type);
5950		return -EINVAL;
5951	}
5952	/*
5953	 * Get the length of the opaque device_addr4. xdr_read_pages places
5954	 * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5955	 * and places the remaining xdr data in xdr_buf->tail
5956	 */
5957	pdev->mincount = be32_to_cpup(p);
5958	if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
5959		return -EIO;
5960
5961	/* Parse notification bitmap, verifying that it is zero. */
5962	p = xdr_inline_decode(xdr, 4);
5963	if (unlikely(!p))
5964		return -EIO;
5965	len = be32_to_cpup(p);
5966	if (len) {
5967		uint32_t i;
5968
5969		p = xdr_inline_decode(xdr, 4 * len);
5970		if (unlikely(!p))
5971			return -EIO;
5972
5973		res->notification = be32_to_cpup(p++);
5974		for (i = 1; i < len; i++) {
5975			if (be32_to_cpup(p++)) {
5976				dprintk("%s: unsupported notification\n",
5977					__func__);
5978				return -EIO;
5979			}
5980		}
5981	}
5982	return 0;
5983}
5984
5985static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5986			    struct nfs4_layoutget_res *res)
5987{
5988	__be32 *p;
5989	int status;
5990	u32 layout_count;
5991	u32 recvd;
5992
5993	status = decode_op_hdr(xdr, OP_LAYOUTGET);
5994	if (status)
5995		goto out;
5996	p = xdr_inline_decode(xdr, 4);
5997	if (unlikely(!p))
5998		goto out_overflow;
5999	res->return_on_close = be32_to_cpup(p);
6000	decode_layout_stateid(xdr, &res->stateid);
6001	p = xdr_inline_decode(xdr, 4);
6002	if (unlikely(!p))
6003		goto out_overflow;
6004	layout_count = be32_to_cpup(p);
6005	if (!layout_count) {
6006		dprintk("%s: server responded with empty layout array\n",
6007			__func__);
6008		status = -EINVAL;
6009		goto out;
6010	}
6011
6012	p = xdr_inline_decode(xdr, 28);
6013	if (unlikely(!p))
6014		goto out_overflow;
6015	p = xdr_decode_hyper(p, &res->range.offset);
6016	p = xdr_decode_hyper(p, &res->range.length);
6017	res->range.iomode = be32_to_cpup(p++);
6018	res->type = be32_to_cpup(p++);
6019	res->layoutp->len = be32_to_cpup(p);
6020
6021	dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
6022		__func__,
6023		(unsigned long)res->range.offset,
6024		(unsigned long)res->range.length,
6025		res->range.iomode,
6026		res->type,
6027		res->layoutp->len);
6028
6029	recvd = xdr_read_pages(xdr, res->layoutp->len);
6030	if (res->layoutp->len > recvd) {
6031		dprintk("NFS: server cheating in layoutget reply: "
6032				"layout len %u > recvd %u\n",
6033				res->layoutp->len, recvd);
6034		status = -EINVAL;
6035		goto out;
6036	}
6037
6038	if (layout_count > 1) {
6039		/* We only handle a length one array at the moment.  Any
6040		 * further entries are just ignored.  Note that this means
6041		 * the client may see a response that is less than the
6042		 * minimum it requested.
6043		 */
6044		dprintk("%s: server responded with %d layouts, dropping tail\n",
6045			__func__, layout_count);
6046	}
6047
6048out:
6049	res->status = status;
6050	return status;
6051out_overflow:
6052	status = -EIO;
6053	goto out;
6054}
6055
6056static int decode_layoutreturn(struct xdr_stream *xdr,
6057			       struct nfs4_layoutreturn_res *res)
6058{
6059	__be32 *p;
6060	int status;
6061
6062	status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
6063	if (status)
6064		return status;
6065	p = xdr_inline_decode(xdr, 4);
6066	if (unlikely(!p))
6067		return -EIO;
6068	res->lrs_present = be32_to_cpup(p);
6069	if (res->lrs_present)
6070		status = decode_layout_stateid(xdr, &res->stateid);
6071	else
6072		nfs4_stateid_copy(&res->stateid, &invalid_stateid);
6073	return status;
6074}
6075
6076static int decode_layoutcommit(struct xdr_stream *xdr,
6077			       struct rpc_rqst *req,
6078			       struct nfs4_layoutcommit_res *res)
6079{
6080	__be32 *p;
6081	__u32 sizechanged;
6082	int status;
6083
6084	status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
6085	res->status = status;
6086	if (status)
6087		return status;
6088
6089	p = xdr_inline_decode(xdr, 4);
6090	if (unlikely(!p))
6091		return -EIO;
6092	sizechanged = be32_to_cpup(p);
6093
6094	if (sizechanged) {
6095		/* throw away new size */
6096		p = xdr_inline_decode(xdr, 8);
6097		if (unlikely(!p))
6098			return -EIO;
6099	}
6100	return 0;
6101}
6102
6103static int decode_test_stateid(struct xdr_stream *xdr,
6104			       struct nfs41_test_stateid_res *res)
6105{
6106	__be32 *p;
6107	int status;
6108	int num_res;
6109
6110	status = decode_op_hdr(xdr, OP_TEST_STATEID);
6111	if (status)
6112		return status;
6113
6114	p = xdr_inline_decode(xdr, 4);
6115	if (unlikely(!p))
6116		return -EIO;
6117	num_res = be32_to_cpup(p++);
6118	if (num_res != 1)
6119		return -EIO;
6120
6121	p = xdr_inline_decode(xdr, 4);
6122	if (unlikely(!p))
6123		return -EIO;
6124	res->status = be32_to_cpup(p++);
6125
6126	return status;
6127}
6128
6129static int decode_free_stateid(struct xdr_stream *xdr,
6130			       struct nfs41_free_stateid_res *res)
6131{
6132	res->status = decode_op_hdr(xdr, OP_FREE_STATEID);
6133	return res->status;
6134}
6135#else
6136static inline
6137int decode_layoutreturn(struct xdr_stream *xdr,
6138			       struct nfs4_layoutreturn_res *res)
6139{
6140	return 0;
6141}
6142
6143static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
6144			    struct nfs4_layoutget_res *res)
6145{
6146	return 0;
6147}
6148
6149#endif /* CONFIG_NFS_V4_1 */
6150
6151/*
6152 * END OF "GENERIC" DECODE ROUTINES.
6153 */
6154
6155/*
6156 * Decode OPEN_DOWNGRADE response
6157 */
6158static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
6159				       struct xdr_stream *xdr,
6160				       void *data)
6161{
6162	struct nfs_closeres *res = data;
6163	struct compound_hdr hdr;
6164	int status;
6165
6166	status = decode_compound_hdr(xdr, &hdr);
6167	if (status)
6168		goto out;
6169	status = decode_sequence(xdr, &res->seq_res, rqstp);
6170	if (status)
6171		goto out;
6172	status = decode_putfh(xdr);
6173	if (status)
6174		goto out;
6175	if (res->lr_res) {
6176		status = decode_layoutreturn(xdr, res->lr_res);
6177		res->lr_ret = status;
6178		if (status)
6179			goto out;
6180	}
6181	status = decode_open_downgrade(xdr, res);
6182out:
6183	return status;
6184}
6185
6186/*
6187 * Decode ACCESS response
6188 */
6189static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6190			       void *data)
6191{
6192	struct nfs4_accessres *res = data;
6193	struct compound_hdr hdr;
6194	int status;
6195
6196	status = decode_compound_hdr(xdr, &hdr);
6197	if (status)
6198		goto out;
6199	status = decode_sequence(xdr, &res->seq_res, rqstp);
6200	if (status)
6201		goto out;
6202	status = decode_putfh(xdr);
6203	if (status != 0)
6204		goto out;
6205	status = decode_access(xdr, &res->supported, &res->access);
6206	if (status != 0)
6207		goto out;
6208	if (res->fattr)
6209		decode_getfattr(xdr, res->fattr, res->server);
6210out:
6211	return status;
6212}
6213
6214/*
6215 * Decode LOOKUP response
6216 */
6217static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6218			       void *data)
6219{
6220	struct nfs4_lookup_res *res = data;
6221	struct compound_hdr hdr;
6222	int status;
6223
6224	status = decode_compound_hdr(xdr, &hdr);
6225	if (status)
6226		goto out;
6227	status = decode_sequence(xdr, &res->seq_res, rqstp);
6228	if (status)
6229		goto out;
6230	status = decode_putfh(xdr);
6231	if (status)
6232		goto out;
6233	status = decode_lookup(xdr);
6234	if (status)
6235		goto out;
6236	status = decode_getfh(xdr, res->fh);
6237	if (status)
6238		goto out;
6239	status = decode_getfattr(xdr, res->fattr, res->server);
6240out:
6241	return status;
6242}
6243
6244/*
6245 * Decode LOOKUPP response
6246 */
6247static int nfs4_xdr_dec_lookupp(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6248		void *data)
6249{
6250	struct nfs4_lookupp_res *res = data;
6251	struct compound_hdr hdr;
6252	int status;
6253
6254	status = decode_compound_hdr(xdr, &hdr);
6255	if (status)
6256		goto out;
6257	status = decode_sequence(xdr, &res->seq_res, rqstp);
6258	if (status)
6259		goto out;
6260	status = decode_putfh(xdr);
6261	if (status)
6262		goto out;
6263	status = decode_lookupp(xdr);
6264	if (status)
6265		goto out;
6266	status = decode_getfh(xdr, res->fh);
6267	if (status)
6268		goto out;
6269	status = decode_getfattr(xdr, res->fattr, res->server);
6270out:
6271	return status;
6272}
6273
6274/*
6275 * Decode LOOKUP_ROOT response
6276 */
6277static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
6278				    struct xdr_stream *xdr,
6279				    void *data)
6280{
6281	struct nfs4_lookup_res *res = data;
6282	struct compound_hdr hdr;
6283	int status;
6284
6285	status = decode_compound_hdr(xdr, &hdr);
6286	if (status)
6287		goto out;
6288	status = decode_sequence(xdr, &res->seq_res, rqstp);
6289	if (status)
6290		goto out;
6291	status = decode_putrootfh(xdr);
6292	if (status)
6293		goto out;
6294	status = decode_getfh(xdr, res->fh);
6295	if (status == 0)
6296		status = decode_getfattr(xdr, res->fattr, res->server);
6297out:
6298	return status;
6299}
6300
6301/*
6302 * Decode REMOVE response
6303 */
6304static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6305			       void *data)
6306{
6307	struct nfs_removeres *res = data;
6308	struct compound_hdr hdr;
6309	int status;
6310
6311	status = decode_compound_hdr(xdr, &hdr);
6312	if (status)
6313		goto out;
6314	status = decode_sequence(xdr, &res->seq_res, rqstp);
6315	if (status)
6316		goto out;
6317	status = decode_putfh(xdr);
6318	if (status)
6319		goto out;
6320	status = decode_remove(xdr, &res->cinfo);
6321out:
6322	return status;
6323}
6324
6325/*
6326 * Decode RENAME response
6327 */
6328static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6329			       void *data)
6330{
6331	struct nfs_renameres *res = data;
6332	struct compound_hdr hdr;
6333	int status;
6334
6335	status = decode_compound_hdr(xdr, &hdr);
6336	if (status)
6337		goto out;
6338	status = decode_sequence(xdr, &res->seq_res, rqstp);
6339	if (status)
6340		goto out;
6341	status = decode_putfh(xdr);
6342	if (status)
6343		goto out;
6344	status = decode_savefh(xdr);
6345	if (status)
6346		goto out;
6347	status = decode_putfh(xdr);
6348	if (status)
6349		goto out;
6350	status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
6351out:
6352	return status;
6353}
6354
6355/*
6356 * Decode LINK response
6357 */
6358static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6359			     void *data)
6360{
6361	struct nfs4_link_res *res = data;
6362	struct compound_hdr hdr;
6363	int status;
6364
6365	status = decode_compound_hdr(xdr, &hdr);
6366	if (status)
6367		goto out;
6368	status = decode_sequence(xdr, &res->seq_res, rqstp);
6369	if (status)
6370		goto out;
6371	status = decode_putfh(xdr);
6372	if (status)
6373		goto out;
6374	status = decode_savefh(xdr);
6375	if (status)
6376		goto out;
6377	status = decode_putfh(xdr);
6378	if (status)
6379		goto out;
6380	status = decode_link(xdr, &res->cinfo);
6381	if (status)
6382		goto out;
6383	/*
6384	 * Note order: OP_LINK leaves the directory as the current
6385	 *             filehandle.
6386	 */
6387	status = decode_restorefh(xdr);
6388	if (status)
6389		goto out;
6390	decode_getfattr(xdr, res->fattr, res->server);
6391out:
6392	return status;
6393}
6394
6395/*
6396 * Decode CREATE response
6397 */
6398static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6399			       void *data)
6400{
6401	struct nfs4_create_res *res = data;
6402	struct compound_hdr hdr;
6403	int status;
6404
6405	status = decode_compound_hdr(xdr, &hdr);
6406	if (status)
6407		goto out;
6408	status = decode_sequence(xdr, &res->seq_res, rqstp);
6409	if (status)
6410		goto out;
6411	status = decode_putfh(xdr);
6412	if (status)
6413		goto out;
6414	status = decode_create(xdr, &res->dir_cinfo);
6415	if (status)
6416		goto out;
6417	status = decode_getfh(xdr, res->fh);
6418	if (status)
6419		goto out;
6420	decode_getfattr(xdr, res->fattr, res->server);
6421out:
6422	return status;
6423}
6424
6425/*
6426 * Decode SYMLINK response
6427 */
6428static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6429				void *res)
6430{
6431	return nfs4_xdr_dec_create(rqstp, xdr, res);
6432}
6433
6434/*
6435 * Decode GETATTR response
6436 */
6437static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6438				void *data)
6439{
6440	struct nfs4_getattr_res *res = data;
6441	struct compound_hdr hdr;
6442	int status;
6443
6444	status = decode_compound_hdr(xdr, &hdr);
6445	if (status)
6446		goto out;
6447	status = decode_sequence(xdr, &res->seq_res, rqstp);
6448	if (status)
6449		goto out;
6450	status = decode_putfh(xdr);
6451	if (status)
6452		goto out;
6453	status = decode_getfattr(xdr, res->fattr, res->server);
6454out:
6455	return status;
6456}
6457
6458/*
6459 * Encode an SETACL request
6460 */
6461static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
6462				const void *data)
6463{
6464	const struct nfs_setaclargs *args = data;
6465	struct compound_hdr hdr = {
6466		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
6467	};
6468
6469	encode_compound_hdr(xdr, req, &hdr);
6470	encode_sequence(xdr, &args->seq_args, &hdr);
6471	encode_putfh(xdr, args->fh, &hdr);
6472	encode_setacl(xdr, args, &hdr);
6473	encode_nops(&hdr);
6474}
6475
6476/*
6477 * Decode SETACL response
6478 */
6479static int
6480nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6481		    void *data)
6482{
6483	struct nfs_setaclres *res = data;
6484	struct compound_hdr hdr;
6485	int status;
6486
6487	status = decode_compound_hdr(xdr, &hdr);
6488	if (status)
6489		goto out;
6490	status = decode_sequence(xdr, &res->seq_res, rqstp);
6491	if (status)
6492		goto out;
6493	status = decode_putfh(xdr);
6494	if (status)
6495		goto out;
6496	status = decode_setattr(xdr);
6497out:
6498	return status;
6499}
6500
6501/*
6502 * Decode GETACL response
6503 */
6504static int
6505nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6506		    void *data)
6507{
6508	struct nfs_getaclres *res = data;
6509	struct compound_hdr hdr;
6510	int status;
6511
6512	if (res->acl_scratch != NULL)
6513		xdr_set_scratch_page(xdr, res->acl_scratch);
6514	status = decode_compound_hdr(xdr, &hdr);
6515	if (status)
6516		goto out;
6517	status = decode_sequence(xdr, &res->seq_res, rqstp);
6518	if (status)
6519		goto out;
6520	status = decode_putfh(xdr);
6521	if (status)
6522		goto out;
6523	status = decode_getacl(xdr, rqstp, res, res->acl_type);
6524
6525out:
6526	return status;
6527}
6528
6529/*
6530 * Decode CLOSE response
6531 */
6532static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6533			      void *data)
6534{
6535	struct nfs_closeres *res = data;
6536	struct compound_hdr hdr;
6537	int status;
6538
6539	status = decode_compound_hdr(xdr, &hdr);
6540	if (status)
6541		goto out;
6542	status = decode_sequence(xdr, &res->seq_res, rqstp);
6543	if (status)
6544		goto out;
6545	status = decode_putfh(xdr);
6546	if (status)
6547		goto out;
6548	if (res->lr_res) {
6549		status = decode_layoutreturn(xdr, res->lr_res);
6550		res->lr_ret = status;
6551		if (status)
6552			goto out;
6553	}
6554	if (res->fattr != NULL) {
6555		status = decode_getfattr(xdr, res->fattr, res->server);
6556		if (status != 0)
6557			goto out;
6558	}
6559	status = decode_close(xdr, res);
6560out:
6561	return status;
6562}
6563
6564/*
6565 * Decode OPEN response
6566 */
6567static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6568			     void *data)
6569{
6570	struct nfs_openres *res = data;
6571	struct compound_hdr hdr;
6572	int status;
6573
6574	status = decode_compound_hdr(xdr, &hdr);
6575	if (status)
6576		goto out;
6577	status = decode_sequence(xdr, &res->seq_res, rqstp);
6578	if (status)
6579		goto out;
6580	status = decode_putfh(xdr);
6581	if (status)
6582		goto out;
6583	status = decode_open(xdr, res);
6584	if (status)
6585		goto out;
6586	status = decode_getfh(xdr, &res->fh);
6587	if (status)
6588		goto out;
6589	if (res->access_request)
6590		decode_access(xdr, &res->access_supported, &res->access_result);
6591	decode_getfattr(xdr, res->f_attr, res->server);
6592	if (res->lg_res)
6593		decode_layoutget(xdr, rqstp, res->lg_res);
6594out:
6595	return status;
6596}
6597
6598/*
6599 * Decode OPEN_CONFIRM response
6600 */
6601static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
6602				     struct xdr_stream *xdr,
6603				     void *data)
6604{
6605	struct nfs_open_confirmres *res = data;
6606	struct compound_hdr hdr;
6607	int status;
6608
6609	status = decode_compound_hdr(xdr, &hdr);
6610	if (status)
6611		goto out;
6612	status = decode_putfh(xdr);
6613	if (status)
6614		goto out;
6615	status = decode_open_confirm(xdr, res);
6616out:
6617	return status;
6618}
6619
6620/*
6621 * Decode OPEN response
6622 */
6623static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
6624				    struct xdr_stream *xdr,
6625				    void *data)
6626{
6627	struct nfs_openres *res = data;
6628	struct compound_hdr hdr;
6629	int status;
6630
6631	status = decode_compound_hdr(xdr, &hdr);
6632	if (status)
6633		goto out;
6634	status = decode_sequence(xdr, &res->seq_res, rqstp);
6635	if (status)
6636		goto out;
6637	status = decode_putfh(xdr);
6638	if (status)
6639		goto out;
6640	status = decode_open(xdr, res);
6641	if (status)
6642		goto out;
6643	if (res->access_request)
6644		decode_access(xdr, &res->access_supported, &res->access_result);
6645	decode_getfattr(xdr, res->f_attr, res->server);
6646	if (res->lg_res)
6647		decode_layoutget(xdr, rqstp, res->lg_res);
6648out:
6649	return status;
6650}
6651
6652/*
6653 * Decode SETATTR response
6654 */
6655static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
6656				struct xdr_stream *xdr,
6657				void *data)
6658{
6659	struct nfs_setattrres *res = data;
6660	struct compound_hdr hdr;
6661	int status;
6662
6663	status = decode_compound_hdr(xdr, &hdr);
6664	if (status)
6665		goto out;
6666	status = decode_sequence(xdr, &res->seq_res, rqstp);
6667	if (status)
6668		goto out;
6669	status = decode_putfh(xdr);
6670	if (status)
6671		goto out;
6672	status = decode_setattr(xdr);
6673	if (status)
6674		goto out;
6675	decode_getfattr(xdr, res->fattr, res->server);
6676out:
6677	return status;
6678}
6679
6680/*
6681 * Decode LOCK response
6682 */
6683static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6684			     void *data)
6685{
6686	struct nfs_lock_res *res = data;
6687	struct compound_hdr hdr;
6688	int status;
6689
6690	status = decode_compound_hdr(xdr, &hdr);
6691	if (status)
6692		goto out;
6693	status = decode_sequence(xdr, &res->seq_res, rqstp);
6694	if (status)
6695		goto out;
6696	status = decode_putfh(xdr);
6697	if (status)
6698		goto out;
6699	status = decode_lock(xdr, res);
6700out:
6701	return status;
6702}
6703
6704/*
6705 * Decode LOCKT response
6706 */
6707static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6708			      void *data)
6709{
6710	struct nfs_lockt_res *res = data;
6711	struct compound_hdr hdr;
6712	int status;
6713
6714	status = decode_compound_hdr(xdr, &hdr);
6715	if (status)
6716		goto out;
6717	status = decode_sequence(xdr, &res->seq_res, rqstp);
6718	if (status)
6719		goto out;
6720	status = decode_putfh(xdr);
6721	if (status)
6722		goto out;
6723	status = decode_lockt(xdr, res);
6724out:
6725	return status;
6726}
6727
6728/*
6729 * Decode LOCKU response
6730 */
6731static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6732			      void *data)
6733{
6734	struct nfs_locku_res *res = data;
6735	struct compound_hdr hdr;
6736	int status;
6737
6738	status = decode_compound_hdr(xdr, &hdr);
6739	if (status)
6740		goto out;
6741	status = decode_sequence(xdr, &res->seq_res, rqstp);
6742	if (status)
6743		goto out;
6744	status = decode_putfh(xdr);
6745	if (status)
6746		goto out;
6747	status = decode_locku(xdr, res);
6748out:
6749	return status;
6750}
6751
6752static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
6753					  struct xdr_stream *xdr, void *dummy)
6754{
6755	struct compound_hdr hdr;
6756	int status;
6757
6758	status = decode_compound_hdr(xdr, &hdr);
6759	if (!status)
6760		status = decode_release_lockowner(xdr);
6761	return status;
6762}
6763
6764/*
6765 * Decode READLINK response
6766 */
6767static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
6768				 struct xdr_stream *xdr,
6769				 void *data)
6770{
6771	struct nfs4_readlink_res *res = data;
6772	struct compound_hdr hdr;
6773	int status;
6774
6775	status = decode_compound_hdr(xdr, &hdr);
6776	if (status)
6777		goto out;
6778	status = decode_sequence(xdr, &res->seq_res, rqstp);
6779	if (status)
6780		goto out;
6781	status = decode_putfh(xdr);
6782	if (status)
6783		goto out;
6784	status = decode_readlink(xdr, rqstp);
6785out:
6786	return status;
6787}
6788
6789/*
6790 * Decode READDIR response
6791 */
6792static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6793				void *data)
6794{
6795	struct nfs4_readdir_res *res = data;
6796	struct compound_hdr hdr;
6797	int status;
6798
6799	status = decode_compound_hdr(xdr, &hdr);
6800	if (status)
6801		goto out;
6802	status = decode_sequence(xdr, &res->seq_res, rqstp);
6803	if (status)
6804		goto out;
6805	status = decode_putfh(xdr);
6806	if (status)
6807		goto out;
6808	status = decode_readdir(xdr, rqstp, res);
6809out:
6810	return status;
6811}
6812
6813/*
6814 * Decode Read response
6815 */
6816static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6817			     void *data)
6818{
6819	struct nfs_pgio_res *res = data;
6820	struct compound_hdr hdr;
6821	int status;
6822
6823	status = decode_compound_hdr(xdr, &hdr);
6824	res->op_status = hdr.status;
6825	if (status)
6826		goto out;
6827	status = decode_sequence(xdr, &res->seq_res, rqstp);
6828	if (status)
6829		goto out;
6830	status = decode_putfh(xdr);
6831	if (status)
6832		goto out;
6833	status = decode_read(xdr, rqstp, res);
6834	if (!status)
6835		status = res->count;
6836out:
6837	return status;
6838}
6839
6840/*
6841 * Decode WRITE response
6842 */
6843static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6844			      void *data)
6845{
6846	struct nfs_pgio_res *res = data;
6847	struct compound_hdr hdr;
6848	int status;
6849
6850	status = decode_compound_hdr(xdr, &hdr);
6851	res->op_status = hdr.status;
6852	if (status)
6853		goto out;
6854	status = decode_sequence(xdr, &res->seq_res, rqstp);
6855	if (status)
6856		goto out;
6857	status = decode_putfh(xdr);
6858	if (status)
6859		goto out;
6860	status = decode_write(xdr, res);
6861	if (status)
6862		goto out;
6863	if (res->fattr)
6864		decode_getfattr(xdr, res->fattr, res->server);
6865	if (!status)
6866		status = res->count;
6867out:
6868	return status;
6869}
6870
6871/*
6872 * Decode COMMIT response
6873 */
6874static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6875			       void *data)
6876{
6877	struct nfs_commitres *res = data;
6878	struct compound_hdr hdr;
6879	int status;
6880
6881	status = decode_compound_hdr(xdr, &hdr);
6882	res->op_status = hdr.status;
6883	if (status)
6884		goto out;
6885	status = decode_sequence(xdr, &res->seq_res, rqstp);
6886	if (status)
6887		goto out;
6888	status = decode_putfh(xdr);
6889	if (status)
6890		goto out;
6891	status = decode_commit(xdr, res);
6892out:
6893	return status;
6894}
6895
6896/*
6897 * Decode FSINFO response
6898 */
6899static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
6900			       void *data)
6901{
6902	struct nfs4_fsinfo_res *res = data;
6903	struct compound_hdr hdr;
6904	int status;
6905
6906	status = decode_compound_hdr(xdr, &hdr);
6907	if (!status)
6908		status = decode_sequence(xdr, &res->seq_res, req);
6909	if (!status)
6910		status = decode_putfh(xdr);
6911	if (!status)
6912		status = decode_fsinfo(xdr, res->fsinfo);
6913	return status;
6914}
6915
6916/*
6917 * Decode PATHCONF response
6918 */
6919static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
6920				 void *data)
6921{
6922	struct nfs4_pathconf_res *res = data;
6923	struct compound_hdr hdr;
6924	int status;
6925
6926	status = decode_compound_hdr(xdr, &hdr);
6927	if (!status)
6928		status = decode_sequence(xdr, &res->seq_res, req);
6929	if (!status)
6930		status = decode_putfh(xdr);
6931	if (!status)
6932		status = decode_pathconf(xdr, res->pathconf);
6933	return status;
6934}
6935
6936/*
6937 * Decode STATFS response
6938 */
6939static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
6940			       void *data)
6941{
6942	struct nfs4_statfs_res *res = data;
6943	struct compound_hdr hdr;
6944	int status;
6945
6946	status = decode_compound_hdr(xdr, &hdr);
6947	if (!status)
6948		status = decode_sequence(xdr, &res->seq_res, req);
6949	if (!status)
6950		status = decode_putfh(xdr);
6951	if (!status)
6952		status = decode_statfs(xdr, res->fsstat);
6953	return status;
6954}
6955
6956/*
6957 * Decode GETATTR_BITMAP response
6958 */
6959static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
6960				    struct xdr_stream *xdr,
6961				    void *data)
6962{
6963	struct nfs4_server_caps_res *res = data;
6964	struct compound_hdr hdr;
6965	int status;
6966
6967	status = decode_compound_hdr(xdr, &hdr);
6968	if (status)
6969		goto out;
6970	status = decode_sequence(xdr, &res->seq_res, req);
6971	if (status)
6972		goto out;
6973	status = decode_putfh(xdr);
6974	if (status)
6975		goto out;
6976	status = decode_server_caps(xdr, res);
6977out:
6978	return status;
6979}
6980
6981/*
6982 * Decode RENEW response
6983 */
6984static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6985			      void *__unused)
6986{
6987	struct compound_hdr hdr;
6988	int status;
6989
6990	status = decode_compound_hdr(xdr, &hdr);
6991	if (!status)
6992		status = decode_renew(xdr);
6993	return status;
6994}
6995
6996/*
6997 * Decode SETCLIENTID response
6998 */
6999static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
7000				    struct xdr_stream *xdr,
7001				    void *data)
7002{
7003	struct nfs4_setclientid_res *res = data;
7004	struct compound_hdr hdr;
7005	int status;
7006
7007	status = decode_compound_hdr(xdr, &hdr);
7008	if (!status)
7009		status = decode_setclientid(xdr, res);
7010	return status;
7011}
7012
7013/*
7014 * Decode SETCLIENTID_CONFIRM response
7015 */
7016static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
7017					    struct xdr_stream *xdr,
7018					    void *data)
7019{
7020	struct compound_hdr hdr;
7021	int status;
7022
7023	status = decode_compound_hdr(xdr, &hdr);
7024	if (!status)
7025		status = decode_setclientid_confirm(xdr);
7026	return status;
7027}
7028
7029/*
7030 * Decode DELEGRETURN response
7031 */
7032static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
7033				    struct xdr_stream *xdr,
7034				    void *data)
7035{
7036	struct nfs4_delegreturnres *res = data;
7037	struct compound_hdr hdr;
7038	int status;
7039
7040	status = decode_compound_hdr(xdr, &hdr);
7041	if (status)
7042		goto out;
7043	status = decode_sequence(xdr, &res->seq_res, rqstp);
7044	if (status)
7045		goto out;
7046	status = decode_putfh(xdr);
7047	if (status != 0)
7048		goto out;
7049	if (res->lr_res) {
7050		status = decode_layoutreturn(xdr, res->lr_res);
7051		res->lr_ret = status;
7052		if (status)
7053			goto out;
7054	}
7055	if (res->fattr) {
7056		status = decode_getfattr(xdr, res->fattr, res->server);
7057		if (status != 0)
7058			goto out;
7059	}
7060	status = decode_delegreturn(xdr);
7061out:
7062	return status;
7063}
7064
7065/*
7066 * Decode FS_LOCATIONS response
7067 */
7068static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
7069				     struct xdr_stream *xdr,
7070				     void *data)
7071{
7072	struct nfs4_fs_locations_res *res = data;
7073	struct compound_hdr hdr;
7074	int status;
7075
7076	status = decode_compound_hdr(xdr, &hdr);
7077	if (status)
7078		goto out;
7079	status = decode_sequence(xdr, &res->seq_res, req);
7080	if (status)
7081		goto out;
7082	status = decode_putfh(xdr);
7083	if (status)
7084		goto out;
7085	if (res->migration) {
7086		xdr_enter_page(xdr, PAGE_SIZE);
7087		status = decode_getfattr_generic(xdr,
7088					res->fs_locations->fattr,
7089					 NULL, res->fs_locations,
7090					 res->fs_locations->server);
7091		if (status)
7092			goto out;
7093		if (res->renew)
7094			status = decode_renew(xdr);
7095	} else {
7096		status = decode_lookup(xdr);
7097		if (status)
7098			goto out;
7099		xdr_enter_page(xdr, PAGE_SIZE);
7100		status = decode_getfattr_generic(xdr,
7101					res->fs_locations->fattr,
7102					 NULL, res->fs_locations,
7103					 res->fs_locations->server);
7104	}
7105out:
7106	return status;
7107}
7108
7109/*
7110 * Decode SECINFO response
7111 */
7112static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
7113				struct xdr_stream *xdr,
7114				void *data)
7115{
7116	struct nfs4_secinfo_res *res = data;
7117	struct compound_hdr hdr;
7118	int status;
7119
7120	status = decode_compound_hdr(xdr, &hdr);
7121	if (status)
7122		goto out;
7123	status = decode_sequence(xdr, &res->seq_res, rqstp);
7124	if (status)
7125		goto out;
7126	status = decode_putfh(xdr);
7127	if (status)
7128		goto out;
7129	status = decode_secinfo(xdr, res);
7130out:
7131	return status;
7132}
7133
7134/*
7135 * Decode FSID_PRESENT response
7136 */
7137static int nfs4_xdr_dec_fsid_present(struct rpc_rqst *rqstp,
7138				     struct xdr_stream *xdr,
7139				     void *data)
7140{
7141	struct nfs4_fsid_present_res *res = data;
7142	struct compound_hdr hdr;
7143	int status;
7144
7145	status = decode_compound_hdr(xdr, &hdr);
7146	if (status)
7147		goto out;
7148	status = decode_sequence(xdr, &res->seq_res, rqstp);
7149	if (status)
7150		goto out;
7151	status = decode_putfh(xdr);
7152	if (status)
7153		goto out;
7154	status = decode_getfh(xdr, res->fh);
7155	if (status)
7156		goto out;
7157	if (res->renew)
7158		status = decode_renew(xdr);
7159out:
7160	return status;
7161}
7162
7163#if defined(CONFIG_NFS_V4_1)
7164/*
7165 * Decode BIND_CONN_TO_SESSION response
7166 */
7167static int nfs4_xdr_dec_bind_conn_to_session(struct rpc_rqst *rqstp,
7168					struct xdr_stream *xdr,
7169					void *res)
7170{
7171	struct compound_hdr hdr;
7172	int status;
7173
7174	status = decode_compound_hdr(xdr, &hdr);
7175	if (!status)
7176		status = decode_bind_conn_to_session(xdr, res);
7177	return status;
7178}
7179
7180/*
7181 * Decode EXCHANGE_ID response
7182 */
7183static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
7184				    struct xdr_stream *xdr,
7185				    void *res)
7186{
7187	struct compound_hdr hdr;
7188	int status;
7189
7190	status = decode_compound_hdr(xdr, &hdr);
7191	if (!status)
7192		status = decode_exchange_id(xdr, res);
7193	return status;
7194}
7195
7196/*
7197 * Decode CREATE_SESSION response
7198 */
7199static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
7200				       struct xdr_stream *xdr,
7201				       void *res)
7202{
7203	struct compound_hdr hdr;
7204	int status;
7205
7206	status = decode_compound_hdr(xdr, &hdr);
7207	if (!status)
7208		status = decode_create_session(xdr, res);
7209	return status;
7210}
7211
7212/*
7213 * Decode DESTROY_SESSION response
7214 */
7215static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
7216					struct xdr_stream *xdr,
7217					void *res)
7218{
7219	struct compound_hdr hdr;
7220	int status;
7221
7222	status = decode_compound_hdr(xdr, &hdr);
7223	if (!status)
7224		status = decode_destroy_session(xdr, res);
7225	return status;
7226}
7227
7228/*
7229 * Decode DESTROY_CLIENTID response
7230 */
7231static int nfs4_xdr_dec_destroy_clientid(struct rpc_rqst *rqstp,
7232					struct xdr_stream *xdr,
7233					void *res)
7234{
7235	struct compound_hdr hdr;
7236	int status;
7237
7238	status = decode_compound_hdr(xdr, &hdr);
7239	if (!status)
7240		status = decode_destroy_clientid(xdr, res);
7241	return status;
7242}
7243
7244/*
7245 * Decode SEQUENCE response
7246 */
7247static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
7248				 struct xdr_stream *xdr,
7249				 void *res)
7250{
7251	struct compound_hdr hdr;
7252	int status;
7253
7254	status = decode_compound_hdr(xdr, &hdr);
7255	if (!status)
7256		status = decode_sequence(xdr, res, rqstp);
7257	return status;
7258}
7259
7260#endif
7261
7262/*
7263 * Decode GET_LEASE_TIME response
7264 */
7265static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
7266				       struct xdr_stream *xdr,
7267				       void *data)
7268{
7269	struct nfs4_get_lease_time_res *res = data;
7270	struct compound_hdr hdr;
7271	int status;
7272
7273	status = decode_compound_hdr(xdr, &hdr);
7274	if (!status)
7275		status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
7276	if (!status)
7277		status = decode_putrootfh(xdr);
7278	if (!status)
7279		status = decode_fsinfo(xdr, res->lr_fsinfo);
7280	return status;
7281}
7282
7283#ifdef CONFIG_NFS_V4_1
7284
7285/*
7286 * Decode RECLAIM_COMPLETE response
7287 */
7288static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
7289					 struct xdr_stream *xdr,
7290					 void *data)
7291{
7292	struct nfs41_reclaim_complete_res *res = data;
7293	struct compound_hdr hdr;
7294	int status;
7295
7296	status = decode_compound_hdr(xdr, &hdr);
7297	if (!status)
7298		status = decode_sequence(xdr, &res->seq_res, rqstp);
7299	if (!status)
7300		status = decode_reclaim_complete(xdr, NULL);
7301	return status;
7302}
7303
7304/*
7305 * Decode GETDEVINFO response
7306 */
7307static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
7308				      struct xdr_stream *xdr,
7309				      void *data)
7310{
7311	struct nfs4_getdeviceinfo_res *res = data;
7312	struct compound_hdr hdr;
7313	int status;
7314
7315	status = decode_compound_hdr(xdr, &hdr);
7316	if (status != 0)
7317		goto out;
7318	status = decode_sequence(xdr, &res->seq_res, rqstp);
7319	if (status != 0)
7320		goto out;
7321	status = decode_getdeviceinfo(xdr, res);
7322out:
7323	return status;
7324}
7325
7326/*
7327 * Decode LAYOUTGET response
7328 */
7329static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
7330				  struct xdr_stream *xdr,
7331				  void *data)
7332{
7333	struct nfs4_layoutget_res *res = data;
7334	struct compound_hdr hdr;
7335	int status;
7336
7337	status = decode_compound_hdr(xdr, &hdr);
7338	if (status)
7339		goto out;
7340	status = decode_sequence(xdr, &res->seq_res, rqstp);
7341	if (status)
7342		goto out;
7343	status = decode_putfh(xdr);
7344	if (status)
7345		goto out;
7346	status = decode_layoutget(xdr, rqstp, res);
7347out:
7348	return status;
7349}
7350
7351/*
7352 * Decode LAYOUTRETURN response
7353 */
7354static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
7355				     struct xdr_stream *xdr,
7356				     void *data)
7357{
7358	struct nfs4_layoutreturn_res *res = data;
7359	struct compound_hdr hdr;
7360	int status;
7361
7362	status = decode_compound_hdr(xdr, &hdr);
7363	if (status)
7364		goto out;
7365	status = decode_sequence(xdr, &res->seq_res, rqstp);
7366	if (status)
7367		goto out;
7368	status = decode_putfh(xdr);
7369	if (status)
7370		goto out;
7371	status = decode_layoutreturn(xdr, res);
7372out:
7373	return status;
7374}
7375
7376/*
7377 * Decode LAYOUTCOMMIT response
7378 */
7379static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
7380				     struct xdr_stream *xdr,
7381				     void *data)
7382{
7383	struct nfs4_layoutcommit_res *res = data;
7384	struct compound_hdr hdr;
7385	int status;
7386
7387	status = decode_compound_hdr(xdr, &hdr);
7388	if (status)
7389		goto out;
7390	status = decode_sequence(xdr, &res->seq_res, rqstp);
7391	if (status)
7392		goto out;
7393	status = decode_putfh(xdr);
7394	if (status)
7395		goto out;
7396	status = decode_layoutcommit(xdr, rqstp, res);
7397	if (status)
7398		goto out;
7399	decode_getfattr(xdr, res->fattr, res->server);
7400out:
7401	return status;
7402}
7403
7404/*
7405 * Decode SECINFO_NO_NAME response
7406 */
7407static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
7408					struct xdr_stream *xdr,
7409					void *data)
7410{
7411	struct nfs4_secinfo_res *res = data;
7412	struct compound_hdr hdr;
7413	int status;
7414
7415	status = decode_compound_hdr(xdr, &hdr);
7416	if (status)
7417		goto out;
7418	status = decode_sequence(xdr, &res->seq_res, rqstp);
7419	if (status)
7420		goto out;
7421	status = decode_putrootfh(xdr);
7422	if (status)
7423		goto out;
7424	status = decode_secinfo_no_name(xdr, res);
7425out:
7426	return status;
7427}
7428
7429/*
7430 * Decode TEST_STATEID response
7431 */
7432static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
7433				     struct xdr_stream *xdr,
7434				     void *data)
7435{
7436	struct nfs41_test_stateid_res *res = data;
7437	struct compound_hdr hdr;
7438	int status;
7439
7440	status = decode_compound_hdr(xdr, &hdr);
7441	if (status)
7442		goto out;
7443	status = decode_sequence(xdr, &res->seq_res, rqstp);
7444	if (status)
7445		goto out;
7446	status = decode_test_stateid(xdr, res);
7447out:
7448	return status;
7449}
7450
7451/*
7452 * Decode FREE_STATEID response
7453 */
7454static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
7455				     struct xdr_stream *xdr,
7456				     void *data)
7457{
7458	struct nfs41_free_stateid_res *res = data;
7459	struct compound_hdr hdr;
7460	int status;
7461
7462	status = decode_compound_hdr(xdr, &hdr);
7463	if (status)
7464		goto out;
7465	status = decode_sequence(xdr, &res->seq_res, rqstp);
7466	if (status)
7467		goto out;
7468	status = decode_free_stateid(xdr, res);
7469out:
7470	return status;
7471}
7472#endif /* CONFIG_NFS_V4_1 */
7473
7474/**
7475 * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
7476 *                      the local page cache.
7477 * @xdr: XDR stream where entry resides
7478 * @entry: buffer to fill in with entry data
7479 * @plus: boolean indicating whether this should be a readdirplus entry
7480 *
7481 * Returns zero if successful, otherwise a negative errno value is
7482 * returned.
7483 *
7484 * This function is not invoked during READDIR reply decoding, but
7485 * rather whenever an application invokes the getdents(2) system call
7486 * on a directory already in our cache.
7487 */
7488int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
7489		       bool plus)
7490{
7491	unsigned int savep;
7492	uint32_t bitmap[3] = {0};
7493	uint32_t len;
7494	uint64_t new_cookie;
7495	__be32 *p = xdr_inline_decode(xdr, 4);
7496	if (unlikely(!p))
7497		return -EAGAIN;
7498	if (*p == xdr_zero) {
7499		p = xdr_inline_decode(xdr, 4);
7500		if (unlikely(!p))
7501			return -EAGAIN;
7502		if (*p == xdr_zero)
7503			return -EAGAIN;
7504		entry->eof = 1;
7505		return -EBADCOOKIE;
7506	}
7507
7508	p = xdr_inline_decode(xdr, 12);
7509	if (unlikely(!p))
7510		return -EAGAIN;
7511	p = xdr_decode_hyper(p, &new_cookie);
7512	entry->len = be32_to_cpup(p);
7513
7514	p = xdr_inline_decode(xdr, entry->len);
7515	if (unlikely(!p))
7516		return -EAGAIN;
7517	entry->name = (const char *) p;
7518
7519	/*
7520	 * In case the server doesn't return an inode number,
7521	 * we fake one here.  (We don't use inode number 0,
7522	 * since glibc seems to choke on it...)
7523	 */
7524	entry->ino = 1;
7525	entry->fattr->valid = 0;
7526
7527	if (decode_attr_bitmap(xdr, bitmap) < 0)
7528		return -EAGAIN;
7529
7530	if (decode_attr_length(xdr, &len, &savep) < 0)
7531		return -EAGAIN;
7532
7533	if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
7534			NULL, entry->server) < 0)
7535		return -EAGAIN;
7536	if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
7537		entry->ino = entry->fattr->mounted_on_fileid;
7538	else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
7539		entry->ino = entry->fattr->fileid;
7540
7541	entry->d_type = DT_UNKNOWN;
7542	if (entry->fattr->valid & NFS_ATTR_FATTR_TYPE)
7543		entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
7544
7545	entry->cookie = new_cookie;
7546
7547	return 0;
7548}
7549
7550/*
7551 * We need to translate between nfs status return values and
7552 * the local errno values which may not be the same.
7553 */
7554static struct {
7555	int stat;
7556	int errno;
7557} nfs_errtbl[] = {
7558	{ NFS4_OK,		0		},
7559	{ NFS4ERR_PERM,		-EPERM		},
7560	{ NFS4ERR_NOENT,	-ENOENT		},
7561	{ NFS4ERR_IO,		-errno_NFSERR_IO},
7562	{ NFS4ERR_NXIO,		-ENXIO		},
7563	{ NFS4ERR_ACCESS,	-EACCES		},
7564	{ NFS4ERR_EXIST,	-EEXIST		},
7565	{ NFS4ERR_XDEV,		-EXDEV		},
7566	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
7567	{ NFS4ERR_ISDIR,	-EISDIR		},
7568	{ NFS4ERR_INVAL,	-EINVAL		},
7569	{ NFS4ERR_FBIG,		-EFBIG		},
7570	{ NFS4ERR_NOSPC,	-ENOSPC		},
7571	{ NFS4ERR_ROFS,		-EROFS		},
7572	{ NFS4ERR_MLINK,	-EMLINK		},
7573	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
7574	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
7575	{ NFS4ERR_DQUOT,	-EDQUOT		},
7576	{ NFS4ERR_STALE,	-ESTALE		},
7577	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
7578	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
7579	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
7580	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
7581	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
7582	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
7583	{ NFS4ERR_LOCKED,	-EAGAIN		},
7584	{ NFS4ERR_SYMLINK,	-ELOOP		},
7585	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
7586	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
7587	{ NFS4ERR_NOXATTR,	-ENODATA	},
7588	{ NFS4ERR_XATTR2BIG,	-E2BIG		},
7589	{ -1,			-EIO		}
7590};
7591
7592/*
7593 * Convert an NFS error code to a local one.
7594 * This one is used jointly by NFSv2 and NFSv3.
7595 */
7596static int
7597nfs4_stat_to_errno(int stat)
7598{
7599	int i;
7600	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
7601		if (nfs_errtbl[i].stat == stat)
7602			return nfs_errtbl[i].errno;
7603	}
7604	if (stat <= 10000 || stat > 10100) {
7605		/* The server is looney tunes. */
7606		return -EREMOTEIO;
7607	}
7608	/* If we cannot translate the error, the recovery routines should
7609	 * handle it.
7610	 * Note: remaining NFSv4 error codes have values > 10000, so should
7611	 * not conflict with native Linux error codes.
7612	 */
7613	return -stat;
7614}
7615
7616#ifdef CONFIG_NFS_V4_2
7617#include "nfs42xdr.c"
7618#endif /* CONFIG_NFS_V4_2 */
7619
7620#define PROC(proc, argtype, restype)				\
7621[NFSPROC4_CLNT_##proc] = {					\
7622	.p_proc   = NFSPROC4_COMPOUND,				\
7623	.p_encode = nfs4_xdr_##argtype,				\
7624	.p_decode = nfs4_xdr_##restype,				\
7625	.p_arglen = NFS4_##argtype##_sz,			\
7626	.p_replen = NFS4_##restype##_sz,			\
7627	.p_statidx = NFSPROC4_CLNT_##proc,			\
7628	.p_name   = #proc,					\
7629}
7630
7631#define STUB(proc)		\
7632[NFSPROC4_CLNT_##proc] = {	\
7633	.p_name = #proc,	\
7634}
7635
7636#if defined(CONFIG_NFS_V4_1)
7637#define PROC41(proc, argtype, restype)				\
7638	PROC(proc, argtype, restype)
7639#else
7640#define PROC41(proc, argtype, restype)				\
7641	STUB(proc)
7642#endif
7643
7644#if defined(CONFIG_NFS_V4_2)
7645#define PROC42(proc, argtype, restype)				\
7646	PROC(proc, argtype, restype)
7647#else
7648#define PROC42(proc, argtype, restype)				\
7649	STUB(proc)
7650#endif
7651
7652const struct rpc_procinfo nfs4_procedures[] = {
7653	PROC(READ,		enc_read,		dec_read),
7654	PROC(WRITE,		enc_write,		dec_write),
7655	PROC(COMMIT,		enc_commit,		dec_commit),
7656	PROC(OPEN,		enc_open,		dec_open),
7657	PROC(OPEN_CONFIRM,	enc_open_confirm,	dec_open_confirm),
7658	PROC(OPEN_NOATTR,	enc_open_noattr,	dec_open_noattr),
7659	PROC(OPEN_DOWNGRADE,	enc_open_downgrade,	dec_open_downgrade),
7660	PROC(CLOSE,		enc_close,		dec_close),
7661	PROC(SETATTR,		enc_setattr,		dec_setattr),
7662	PROC(FSINFO,		enc_fsinfo,		dec_fsinfo),
7663	PROC(RENEW,		enc_renew,		dec_renew),
7664	PROC(SETCLIENTID,	enc_setclientid,	dec_setclientid),
7665	PROC(SETCLIENTID_CONFIRM, enc_setclientid_confirm, dec_setclientid_confirm),
7666	PROC(LOCK,		enc_lock,		dec_lock),
7667	PROC(LOCKT,		enc_lockt,		dec_lockt),
7668	PROC(LOCKU,		enc_locku,		dec_locku),
7669	PROC(ACCESS,		enc_access,		dec_access),
7670	PROC(GETATTR,		enc_getattr,		dec_getattr),
7671	PROC(LOOKUP,		enc_lookup,		dec_lookup),
7672	PROC(LOOKUP_ROOT,	enc_lookup_root,	dec_lookup_root),
7673	PROC(REMOVE,		enc_remove,		dec_remove),
7674	PROC(RENAME,		enc_rename,		dec_rename),
7675	PROC(LINK,		enc_link,		dec_link),
7676	PROC(SYMLINK,		enc_symlink,		dec_symlink),
7677	PROC(CREATE,		enc_create,		dec_create),
7678	PROC(PATHCONF,		enc_pathconf,		dec_pathconf),
7679	PROC(STATFS,		enc_statfs,		dec_statfs),
7680	PROC(READLINK,		enc_readlink,		dec_readlink),
7681	PROC(READDIR,		enc_readdir,		dec_readdir),
7682	PROC(SERVER_CAPS,	enc_server_caps,	dec_server_caps),
7683	PROC(DELEGRETURN,	enc_delegreturn,	dec_delegreturn),
7684	PROC(GETACL,		enc_getacl,		dec_getacl),
7685	PROC(SETACL,		enc_setacl,		dec_setacl),
7686	PROC(FS_LOCATIONS,	enc_fs_locations,	dec_fs_locations),
7687	PROC(RELEASE_LOCKOWNER,	enc_release_lockowner,	dec_release_lockowner),
7688	PROC(SECINFO,		enc_secinfo,		dec_secinfo),
7689	PROC(FSID_PRESENT,	enc_fsid_present,	dec_fsid_present),
7690	PROC41(EXCHANGE_ID,	enc_exchange_id,	dec_exchange_id),
7691	PROC41(CREATE_SESSION,	enc_create_session,	dec_create_session),
7692	PROC41(DESTROY_SESSION,	enc_destroy_session,	dec_destroy_session),
7693	PROC41(SEQUENCE,	enc_sequence,		dec_sequence),
7694	PROC(GET_LEASE_TIME,	enc_get_lease_time,	dec_get_lease_time),
7695	PROC41(RECLAIM_COMPLETE,enc_reclaim_complete,	dec_reclaim_complete),
7696	PROC41(GETDEVICEINFO,	enc_getdeviceinfo,	dec_getdeviceinfo),
7697	PROC41(LAYOUTGET,	enc_layoutget,		dec_layoutget),
7698	PROC41(LAYOUTCOMMIT,	enc_layoutcommit,	dec_layoutcommit),
7699	PROC41(LAYOUTRETURN,	enc_layoutreturn,	dec_layoutreturn),
7700	PROC41(SECINFO_NO_NAME,	enc_secinfo_no_name,	dec_secinfo_no_name),
7701	PROC41(TEST_STATEID,	enc_test_stateid,	dec_test_stateid),
7702	PROC41(FREE_STATEID,	enc_free_stateid,	dec_free_stateid),
7703	STUB(GETDEVICELIST),
7704	PROC41(BIND_CONN_TO_SESSION,
7705			enc_bind_conn_to_session, dec_bind_conn_to_session),
7706	PROC41(DESTROY_CLIENTID,enc_destroy_clientid,	dec_destroy_clientid),
7707	PROC42(SEEK,		enc_seek,		dec_seek),
7708	PROC42(ALLOCATE,	enc_allocate,		dec_allocate),
7709	PROC42(DEALLOCATE,	enc_deallocate,		dec_deallocate),
7710	PROC42(LAYOUTSTATS,	enc_layoutstats,	dec_layoutstats),
7711	PROC42(CLONE,		enc_clone,		dec_clone),
7712	PROC42(COPY,		enc_copy,		dec_copy),
7713	PROC42(OFFLOAD_CANCEL,	enc_offload_cancel,	dec_offload_cancel),
7714	PROC42(COPY_NOTIFY,	enc_copy_notify,	dec_copy_notify),
7715	PROC(LOOKUPP,		enc_lookupp,		dec_lookupp),
7716	PROC42(LAYOUTERROR,	enc_layouterror,	dec_layouterror),
7717	PROC42(GETXATTR,	enc_getxattr,		dec_getxattr),
7718	PROC42(SETXATTR,	enc_setxattr,		dec_setxattr),
7719	PROC42(LISTXATTRS,	enc_listxattrs,		dec_listxattrs),
7720	PROC42(REMOVEXATTR,	enc_removexattr,	dec_removexattr),
7721	PROC42(READ_PLUS,	enc_read_plus,		dec_read_plus),
7722};
7723
7724static unsigned int nfs_version4_counts[ARRAY_SIZE(nfs4_procedures)];
7725const struct rpc_version nfs_version4 = {
7726	.number			= 4,
7727	.nrprocs		= ARRAY_SIZE(nfs4_procedures),
7728	.procs			= nfs4_procedures,
7729	.counts			= nfs_version4_counts,
7730};
7731