xref: /openbmc/linux/fs/nfs/nfs4xdr.c (revision 276e552e)
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 
69 struct compound_hdr;
70 static int nfs4_stat_to_errno(int);
71 static void encode_layoutget(struct xdr_stream *xdr,
72 			     const struct nfs4_layoutget_args *args,
73 			     struct compound_hdr *hdr);
74 static 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 
921 const 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 
928 const 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 
934 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
935 					   compound_decode_hdr_maxsz +
936 					   decode_sequence_maxsz) *
937 					  XDR_UNIT);
938 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
939 #endif /* CONFIG_NFS_V4_1 */
940 
941 static 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 
954 struct 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 
964 static __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 
971 static 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 
976 static 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 
981 static void encode_uint32(struct xdr_stream *xdr, u32 n)
982 {
983 	WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
984 }
985 
986 static void encode_uint64(struct xdr_stream *xdr, u64 n)
987 {
988 	WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
989 }
990 
991 static 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 
1005 static 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 
1020 static 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 
1029 static 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 
1048 static 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 
1057 static 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 
1063 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1064 {
1065 	encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
1066 }
1067 
1068 static 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 
1073 static __be32 *
1074 xdr_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 
1081 static 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 
1200 static 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 
1206 static 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 
1213 static 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 
1223 static 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 
1254 static 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 
1270 static 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 
1276 static 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 
1283 static 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 
1289 static 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 
1295 static 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 
1300 static 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 
1306 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1307 {
1308 	if (fl->fl_type == F_RDLCK)
1309 		return block ? NFS4_READW_LT : NFS4_READ_LT;
1310 	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1311 }
1312 
1313 static 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 
1320 static 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  */
1336 static 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 
1359 static 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 
1371 static 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 
1384 static 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 
1390 static 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 
1396 static 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 
1401 static 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 
1410 static 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 
1428 static 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 
1456 static 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 
1471 static 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 
1491 static 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 
1500 static 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 
1509 static 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 
1519 static 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 
1527 static 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 
1536 static 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 
1562 static 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 
1569 static 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 
1577 static void
1578 encode_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 
1584 static 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 
1589 static 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 
1602 static 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_RDATTR_ERROR,
1606 		FATTR4_WORD1_MOUNTED_ON_FILEID,
1607 	};
1608 	uint32_t dircount = readdir->count >> 1;
1609 	__be32 *p, verf[2];
1610 	uint32_t attrlen = 0;
1611 	unsigned int i;
1612 
1613 	if (readdir->plus) {
1614 		attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1615 			FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1616 		attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1617 			FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1618 			FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1619 			FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1620 		attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1621 		dircount >>= 1;
1622 	}
1623 	/* Use mounted_on_fileid only if the server supports it */
1624 	if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1625 		attrs[0] |= FATTR4_WORD0_FILEID;
1626 	for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1627 		attrs[i] &= readdir->bitmask[i];
1628 		if (attrs[i] != 0)
1629 			attrlen = i+1;
1630 	}
1631 
1632 	encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1633 	encode_uint64(xdr, readdir->cookie);
1634 	encode_nfs4_verifier(xdr, &readdir->verifier);
1635 	p = reserve_space(xdr, 12 + (attrlen << 2));
1636 	*p++ = cpu_to_be32(dircount);
1637 	*p++ = cpu_to_be32(readdir->count);
1638 	*p++ = cpu_to_be32(attrlen);
1639 	for (i = 0; i < attrlen; i++)
1640 		*p++ = cpu_to_be32(attrs[i]);
1641 	memcpy(verf, readdir->verifier.data, sizeof(verf));
1642 
1643 	dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1644 			__func__,
1645 			(unsigned long long)readdir->cookie,
1646 			verf[0], verf[1],
1647 			attrs[0] & readdir->bitmask[0],
1648 			attrs[1] & readdir->bitmask[1],
1649 			attrs[2] & readdir->bitmask[2]);
1650 }
1651 
1652 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1653 {
1654 	encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1655 }
1656 
1657 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1658 {
1659 	encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1660 	encode_string(xdr, name->len, name->name);
1661 }
1662 
1663 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1664 {
1665 	encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1666 	encode_string(xdr, oldname->len, oldname->name);
1667 	encode_string(xdr, newname->len, newname->name);
1668 }
1669 
1670 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1671 			 struct compound_hdr *hdr)
1672 {
1673 	encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1674 	encode_uint64(xdr, clid);
1675 }
1676 
1677 static void
1678 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1679 {
1680 	encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1681 }
1682 
1683 static void
1684 encode_setacl(struct xdr_stream *xdr, const struct nfs_setaclargs *arg,
1685 		struct compound_hdr *hdr)
1686 {
1687 	__be32 *p;
1688 
1689 	encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1690 	encode_nfs4_stateid(xdr, &zero_stateid);
1691 	p = reserve_space(xdr, 2*4);
1692 	*p++ = cpu_to_be32(1);
1693 	*p = cpu_to_be32(FATTR4_WORD0_ACL);
1694 	p = reserve_space(xdr, 4);
1695 	*p = cpu_to_be32(arg->acl_len);
1696 	xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
1697 }
1698 
1699 static void
1700 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1701 {
1702 	encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1703 }
1704 
1705 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1706 {
1707 	encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1708 	encode_nfs4_stateid(xdr, &arg->stateid);
1709 	encode_attrs(xdr, arg->iap, arg->label, NULL, server,
1710 			server->attr_bitmask);
1711 }
1712 
1713 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1714 {
1715 	__be32 *p;
1716 
1717 	encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1718 	encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1719 
1720 	encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1721 			setclientid->sc_clnt->cl_owner_id);
1722 	p = reserve_space(xdr, 4);
1723 	*p = cpu_to_be32(setclientid->sc_prog);
1724 	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1725 	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1726 	p = reserve_space(xdr, 4);
1727 	*p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1728 }
1729 
1730 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1731 {
1732 	encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1733 			decode_setclientid_confirm_maxsz, hdr);
1734 	encode_uint64(xdr, arg->clientid);
1735 	encode_nfs4_verifier(xdr, &arg->confirm);
1736 }
1737 
1738 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1739 			 struct compound_hdr *hdr)
1740 {
1741 	__be32 *p;
1742 
1743 	encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1744 	encode_nfs4_stateid(xdr, &args->stateid);
1745 
1746 	p = reserve_space(xdr, 16);
1747 	p = xdr_encode_hyper(p, args->offset);
1748 	*p++ = cpu_to_be32(args->stable);
1749 	*p = cpu_to_be32(args->count);
1750 
1751 	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1752 }
1753 
1754 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1755 {
1756 	encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1757 	encode_nfs4_stateid(xdr, stateid);
1758 }
1759 
1760 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1761 {
1762 	encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1763 	encode_string(xdr, name->len, name->name);
1764 }
1765 
1766 #if defined(CONFIG_NFS_V4_1)
1767 /* NFSv4.1 operations */
1768 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1769 				   const struct nfs41_bind_conn_to_session_args *args,
1770 				   struct compound_hdr *hdr)
1771 {
1772 	__be32 *p;
1773 
1774 	encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1775 		decode_bind_conn_to_session_maxsz, hdr);
1776 	encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1777 	p = xdr_reserve_space(xdr, 8);
1778 	*p++ = cpu_to_be32(args->dir);
1779 	*p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1780 }
1781 
1782 static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
1783 {
1784 	unsigned int i;
1785 	encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1786 	for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1787 		encode_uint32(xdr, op_map->u.words[i]);
1788 }
1789 
1790 static void encode_exchange_id(struct xdr_stream *xdr,
1791 			       const struct nfs41_exchange_id_args *args,
1792 			       struct compound_hdr *hdr)
1793 {
1794 	__be32 *p;
1795 	char impl_name[IMPL_NAME_LIMIT];
1796 	int len = 0;
1797 
1798 	encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1799 	encode_nfs4_verifier(xdr, &args->verifier);
1800 
1801 	encode_string(xdr, strlen(args->client->cl_owner_id),
1802 			args->client->cl_owner_id);
1803 
1804 	encode_uint32(xdr, args->flags);
1805 	encode_uint32(xdr, args->state_protect.how);
1806 
1807 	switch (args->state_protect.how) {
1808 	case SP4_NONE:
1809 		break;
1810 	case SP4_MACH_CRED:
1811 		encode_op_map(xdr, &args->state_protect.enforce);
1812 		encode_op_map(xdr, &args->state_protect.allow);
1813 		break;
1814 	default:
1815 		WARN_ON_ONCE(1);
1816 		break;
1817 	}
1818 
1819 	if (send_implementation_id &&
1820 	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1821 	    sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1822 		<= sizeof(impl_name) + 1)
1823 		len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1824 			       utsname()->sysname, utsname()->release,
1825 			       utsname()->version, utsname()->machine);
1826 
1827 	if (len > 0) {
1828 		encode_uint32(xdr, 1);	/* implementation id array length=1 */
1829 
1830 		encode_string(xdr,
1831 			sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1832 			CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1833 		encode_string(xdr, len, impl_name);
1834 		/* just send zeros for nii_date - the date is in nii_name */
1835 		p = reserve_space(xdr, 12);
1836 		p = xdr_encode_hyper(p, 0);
1837 		*p = cpu_to_be32(0);
1838 	} else
1839 		encode_uint32(xdr, 0);	/* implementation id array length=0 */
1840 }
1841 
1842 static void encode_create_session(struct xdr_stream *xdr,
1843 				  const struct nfs41_create_session_args *args,
1844 				  struct compound_hdr *hdr)
1845 {
1846 	__be32 *p;
1847 	struct nfs_client *clp = args->client;
1848 	struct rpc_clnt *clnt = clp->cl_rpcclient;
1849 	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1850 	u32 max_resp_sz_cached;
1851 
1852 	/*
1853 	 * Assumes OPEN is the biggest non-idempotent compound.
1854 	 * 2 is the verifier.
1855 	 */
1856 	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
1857 				* XDR_UNIT + RPC_MAX_AUTH_SIZE;
1858 
1859 	encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1860 	p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1861 	p = xdr_encode_hyper(p, args->clientid);
1862 	*p++ = cpu_to_be32(args->seqid);			/*Sequence id */
1863 	*p++ = cpu_to_be32(args->flags);			/*flags */
1864 
1865 	/* Fore Channel */
1866 	*p++ = cpu_to_be32(0);				/* header padding size */
1867 	*p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz);	/* max req size */
1868 	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz);	/* max resp size */
1869 	*p++ = cpu_to_be32(max_resp_sz_cached);		/* Max resp sz cached */
1870 	*p++ = cpu_to_be32(args->fc_attrs.max_ops);	/* max operations */
1871 	*p++ = cpu_to_be32(args->fc_attrs.max_reqs);	/* max requests */
1872 	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1873 
1874 	/* Back Channel */
1875 	*p++ = cpu_to_be32(0);				/* header padding size */
1876 	*p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz);	/* max req size */
1877 	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz);	/* max resp size */
1878 	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
1879 	*p++ = cpu_to_be32(args->bc_attrs.max_ops);	/* max operations */
1880 	*p++ = cpu_to_be32(args->bc_attrs.max_reqs);	/* max requests */
1881 	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1882 
1883 	*p++ = cpu_to_be32(args->cb_program);		/* cb_program */
1884 	*p++ = cpu_to_be32(1);
1885 	*p++ = cpu_to_be32(RPC_AUTH_UNIX);			/* auth_sys */
1886 
1887 	/* authsys_parms rfc1831 */
1888 	*p++ = cpu_to_be32(ktime_to_ns(nn->boot_time));	/* stamp */
1889 	p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1890 	*p++ = cpu_to_be32(0);				/* UID */
1891 	*p++ = cpu_to_be32(0);				/* GID */
1892 	*p = cpu_to_be32(0);				/* No more gids */
1893 }
1894 
1895 static void encode_destroy_session(struct xdr_stream *xdr,
1896 				   const struct nfs4_session *session,
1897 				   struct compound_hdr *hdr)
1898 {
1899 	encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1900 	encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1901 }
1902 
1903 static void encode_destroy_clientid(struct xdr_stream *xdr,
1904 				   uint64_t clientid,
1905 				   struct compound_hdr *hdr)
1906 {
1907 	encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1908 	encode_uint64(xdr, clientid);
1909 }
1910 
1911 static void encode_reclaim_complete(struct xdr_stream *xdr,
1912 				    const struct nfs41_reclaim_complete_args *args,
1913 				    struct compound_hdr *hdr)
1914 {
1915 	encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1916 	encode_uint32(xdr, args->one_fs);
1917 }
1918 #endif /* CONFIG_NFS_V4_1 */
1919 
1920 static void encode_sequence(struct xdr_stream *xdr,
1921 			    const struct nfs4_sequence_args *args,
1922 			    struct compound_hdr *hdr)
1923 {
1924 #if defined(CONFIG_NFS_V4_1)
1925 	struct nfs4_session *session;
1926 	struct nfs4_slot_table *tp;
1927 	struct nfs4_slot *slot = args->sa_slot;
1928 	__be32 *p;
1929 
1930 	tp = slot->table;
1931 	session = tp->session;
1932 	if (!session)
1933 		return;
1934 
1935 	encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1936 
1937 	/*
1938 	 * Sessionid + seqid + slotid + max slotid + cache_this
1939 	 */
1940 	dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1941 		"max_slotid=%d cache_this=%d\n",
1942 		__func__,
1943 		((u32 *)session->sess_id.data)[0],
1944 		((u32 *)session->sess_id.data)[1],
1945 		((u32 *)session->sess_id.data)[2],
1946 		((u32 *)session->sess_id.data)[3],
1947 		slot->seq_nr, slot->slot_nr,
1948 		tp->highest_used_slotid, args->sa_cache_this);
1949 	p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1950 	p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1951 	*p++ = cpu_to_be32(slot->seq_nr);
1952 	*p++ = cpu_to_be32(slot->slot_nr);
1953 	*p++ = cpu_to_be32(tp->highest_used_slotid);
1954 	*p = cpu_to_be32(args->sa_cache_this);
1955 #endif /* CONFIG_NFS_V4_1 */
1956 }
1957 
1958 #ifdef CONFIG_NFS_V4_1
1959 static void
1960 encode_getdeviceinfo(struct xdr_stream *xdr,
1961 		     const struct nfs4_getdeviceinfo_args *args,
1962 		     struct compound_hdr *hdr)
1963 {
1964 	__be32 *p;
1965 
1966 	encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1967 	p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1968 	p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1969 				    NFS4_DEVICEID4_SIZE);
1970 	*p++ = cpu_to_be32(args->pdev->layout_type);
1971 	*p++ = cpu_to_be32(args->pdev->maxcount);	/* gdia_maxcount */
1972 
1973 	p = reserve_space(xdr, 4 + 4);
1974 	*p++ = cpu_to_be32(1);			/* bitmap length */
1975 	*p++ = cpu_to_be32(args->notify_types);
1976 }
1977 
1978 static void
1979 encode_layoutget(struct xdr_stream *xdr,
1980 		      const struct nfs4_layoutget_args *args,
1981 		      struct compound_hdr *hdr)
1982 {
1983 	__be32 *p;
1984 
1985 	encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1986 	p = reserve_space(xdr, 36);
1987 	*p++ = cpu_to_be32(0);     /* Signal layout available */
1988 	*p++ = cpu_to_be32(args->type);
1989 	*p++ = cpu_to_be32(args->range.iomode);
1990 	p = xdr_encode_hyper(p, args->range.offset);
1991 	p = xdr_encode_hyper(p, args->range.length);
1992 	p = xdr_encode_hyper(p, args->minlength);
1993 	encode_nfs4_stateid(xdr, &args->stateid);
1994 	encode_uint32(xdr, args->maxcount);
1995 
1996 	dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1997 		__func__,
1998 		args->type,
1999 		args->range.iomode,
2000 		(unsigned long)args->range.offset,
2001 		(unsigned long)args->range.length,
2002 		args->maxcount);
2003 }
2004 
2005 static int
2006 encode_layoutcommit(struct xdr_stream *xdr,
2007 		    struct inode *inode,
2008 		    const struct nfs4_layoutcommit_args *args,
2009 		    struct compound_hdr *hdr)
2010 {
2011 	__be32 *p;
2012 
2013 	dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
2014 		NFS_SERVER(args->inode)->pnfs_curr_ld->id);
2015 
2016 	encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2017 	p = reserve_space(xdr, 20);
2018 	/* Only whole file layouts */
2019 	p = xdr_encode_hyper(p, 0); /* offset */
2020 	p = xdr_encode_hyper(p, args->lastbytewritten + 1);	/* length */
2021 	*p = cpu_to_be32(0); /* reclaim */
2022 	encode_nfs4_stateid(xdr, &args->stateid);
2023 	if (args->lastbytewritten != U64_MAX) {
2024 		p = reserve_space(xdr, 20);
2025 		*p++ = cpu_to_be32(1); /* newoffset = TRUE */
2026 		p = xdr_encode_hyper(p, args->lastbytewritten);
2027 	} else {
2028 		p = reserve_space(xdr, 12);
2029 		*p++ = cpu_to_be32(0); /* newoffset = FALSE */
2030 	}
2031 	*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2032 	*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2033 
2034 	encode_uint32(xdr, args->layoutupdate_len);
2035 	if (args->layoutupdate_pages)
2036 		xdr_write_pages(xdr, args->layoutupdate_pages, 0,
2037 				args->layoutupdate_len);
2038 
2039 	return 0;
2040 }
2041 
2042 static void
2043 encode_layoutreturn(struct xdr_stream *xdr,
2044 		    const struct nfs4_layoutreturn_args *args,
2045 		    struct compound_hdr *hdr)
2046 {
2047 	__be32 *p;
2048 
2049 	encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2050 	p = reserve_space(xdr, 16);
2051 	*p++ = cpu_to_be32(0);		/* reclaim. always 0 for now */
2052 	*p++ = cpu_to_be32(args->layout_type);
2053 	*p++ = cpu_to_be32(args->range.iomode);
2054 	*p = cpu_to_be32(RETURN_FILE);
2055 	p = reserve_space(xdr, 16);
2056 	p = xdr_encode_hyper(p, args->range.offset);
2057 	p = xdr_encode_hyper(p, args->range.length);
2058 	spin_lock(&args->inode->i_lock);
2059 	encode_nfs4_stateid(xdr, &args->stateid);
2060 	spin_unlock(&args->inode->i_lock);
2061 	if (args->ld_private->ops && args->ld_private->ops->encode)
2062 		args->ld_private->ops->encode(xdr, args, args->ld_private);
2063 	else
2064 		encode_uint32(xdr, 0);
2065 }
2066 
2067 static int
2068 encode_secinfo_no_name(struct xdr_stream *xdr,
2069 		       const struct nfs41_secinfo_no_name_args *args,
2070 		       struct compound_hdr *hdr)
2071 {
2072 	encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2073 	encode_uint32(xdr, args->style);
2074 	return 0;
2075 }
2076 
2077 static void encode_test_stateid(struct xdr_stream *xdr,
2078 				const struct nfs41_test_stateid_args *args,
2079 				struct compound_hdr *hdr)
2080 {
2081 	encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2082 	encode_uint32(xdr, 1);
2083 	encode_nfs4_stateid(xdr, args->stateid);
2084 }
2085 
2086 static void encode_free_stateid(struct xdr_stream *xdr,
2087 				const struct nfs41_free_stateid_args *args,
2088 				struct compound_hdr *hdr)
2089 {
2090 	encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2091 	encode_nfs4_stateid(xdr, &args->stateid);
2092 }
2093 #else
2094 static inline void
2095 encode_layoutreturn(struct xdr_stream *xdr,
2096 		    const struct nfs4_layoutreturn_args *args,
2097 		    struct compound_hdr *hdr)
2098 {
2099 }
2100 
2101 static void
2102 encode_layoutget(struct xdr_stream *xdr,
2103 		      const struct nfs4_layoutget_args *args,
2104 		      struct compound_hdr *hdr)
2105 {
2106 }
2107 #endif /* CONFIG_NFS_V4_1 */
2108 
2109 /*
2110  * END OF "GENERIC" ENCODE ROUTINES.
2111  */
2112 
2113 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2114 {
2115 #if defined(CONFIG_NFS_V4_1)
2116 	struct nfs4_session *session = args->sa_slot->table->session;
2117 	if (session)
2118 		return session->clp->cl_mvops->minor_version;
2119 #endif /* CONFIG_NFS_V4_1 */
2120 	return 0;
2121 }
2122 
2123 /*
2124  * Encode an ACCESS request
2125  */
2126 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2127 				const void *data)
2128 {
2129 	const struct nfs4_accessargs *args = data;
2130 	struct compound_hdr hdr = {
2131 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2132 	};
2133 
2134 	encode_compound_hdr(xdr, req, &hdr);
2135 	encode_sequence(xdr, &args->seq_args, &hdr);
2136 	encode_putfh(xdr, args->fh, &hdr);
2137 	encode_access(xdr, args->access, &hdr);
2138 	if (args->bitmask)
2139 		encode_getfattr(xdr, args->bitmask, &hdr);
2140 	encode_nops(&hdr);
2141 }
2142 
2143 /*
2144  * Encode LOOKUP request
2145  */
2146 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2147 				const void *data)
2148 {
2149 	const struct nfs4_lookup_arg *args = data;
2150 	struct compound_hdr hdr = {
2151 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2152 	};
2153 
2154 	encode_compound_hdr(xdr, req, &hdr);
2155 	encode_sequence(xdr, &args->seq_args, &hdr);
2156 	encode_putfh(xdr, args->dir_fh, &hdr);
2157 	encode_lookup(xdr, args->name, &hdr);
2158 	encode_getfh(xdr, &hdr);
2159 	encode_getfattr(xdr, args->bitmask, &hdr);
2160 	encode_nops(&hdr);
2161 }
2162 
2163 /*
2164  * Encode LOOKUPP request
2165  */
2166 static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
2167 		const void *data)
2168 {
2169 	const struct nfs4_lookupp_arg *args = data;
2170 	struct compound_hdr hdr = {
2171 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2172 	};
2173 
2174 	encode_compound_hdr(xdr, req, &hdr);
2175 	encode_sequence(xdr, &args->seq_args, &hdr);
2176 	encode_putfh(xdr, args->fh, &hdr);
2177 	encode_lookupp(xdr, &hdr);
2178 	encode_getfh(xdr, &hdr);
2179 	encode_getfattr(xdr, args->bitmask, &hdr);
2180 	encode_nops(&hdr);
2181 }
2182 
2183 /*
2184  * Encode LOOKUP_ROOT request
2185  */
2186 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2187 				     struct xdr_stream *xdr,
2188 				     const void *data)
2189 {
2190 	const struct nfs4_lookup_root_arg *args = data;
2191 	struct compound_hdr hdr = {
2192 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2193 	};
2194 
2195 	encode_compound_hdr(xdr, req, &hdr);
2196 	encode_sequence(xdr, &args->seq_args, &hdr);
2197 	encode_putrootfh(xdr, &hdr);
2198 	encode_getfh(xdr, &hdr);
2199 	encode_getfattr(xdr, args->bitmask, &hdr);
2200 	encode_nops(&hdr);
2201 }
2202 
2203 /*
2204  * Encode REMOVE request
2205  */
2206 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2207 				const void *data)
2208 {
2209 	const struct nfs_removeargs *args = data;
2210 	struct compound_hdr hdr = {
2211 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2212 	};
2213 
2214 	encode_compound_hdr(xdr, req, &hdr);
2215 	encode_sequence(xdr, &args->seq_args, &hdr);
2216 	encode_putfh(xdr, args->fh, &hdr);
2217 	encode_remove(xdr, &args->name, &hdr);
2218 	encode_nops(&hdr);
2219 }
2220 
2221 /*
2222  * Encode RENAME request
2223  */
2224 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2225 				const void *data)
2226 {
2227 	const struct nfs_renameargs *args = data;
2228 	struct compound_hdr hdr = {
2229 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2230 	};
2231 
2232 	encode_compound_hdr(xdr, req, &hdr);
2233 	encode_sequence(xdr, &args->seq_args, &hdr);
2234 	encode_putfh(xdr, args->old_dir, &hdr);
2235 	encode_savefh(xdr, &hdr);
2236 	encode_putfh(xdr, args->new_dir, &hdr);
2237 	encode_rename(xdr, args->old_name, args->new_name, &hdr);
2238 	encode_nops(&hdr);
2239 }
2240 
2241 /*
2242  * Encode LINK request
2243  */
2244 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2245 			      const void *data)
2246 {
2247 	const struct nfs4_link_arg *args = data;
2248 	struct compound_hdr hdr = {
2249 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2250 	};
2251 
2252 	encode_compound_hdr(xdr, req, &hdr);
2253 	encode_sequence(xdr, &args->seq_args, &hdr);
2254 	encode_putfh(xdr, args->fh, &hdr);
2255 	encode_savefh(xdr, &hdr);
2256 	encode_putfh(xdr, args->dir_fh, &hdr);
2257 	encode_link(xdr, args->name, &hdr);
2258 	encode_restorefh(xdr, &hdr);
2259 	encode_getfattr(xdr, args->bitmask, &hdr);
2260 	encode_nops(&hdr);
2261 }
2262 
2263 /*
2264  * Encode CREATE request
2265  */
2266 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2267 				const void *data)
2268 {
2269 	const struct nfs4_create_arg *args = data;
2270 	struct compound_hdr hdr = {
2271 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2272 	};
2273 
2274 	encode_compound_hdr(xdr, req, &hdr);
2275 	encode_sequence(xdr, &args->seq_args, &hdr);
2276 	encode_putfh(xdr, args->dir_fh, &hdr);
2277 	encode_create(xdr, args, &hdr);
2278 	encode_getfh(xdr, &hdr);
2279 	encode_getfattr(xdr, args->bitmask, &hdr);
2280 	encode_nops(&hdr);
2281 }
2282 
2283 /*
2284  * Encode SYMLINK request
2285  */
2286 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2287 				 const void *data)
2288 {
2289 	const struct nfs4_create_arg *args = data;
2290 
2291 	nfs4_xdr_enc_create(req, xdr, args);
2292 }
2293 
2294 /*
2295  * Encode GETATTR request
2296  */
2297 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2298 				 const void *data)
2299 {
2300 	const struct nfs4_getattr_arg *args = data;
2301 	struct compound_hdr hdr = {
2302 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2303 	};
2304 
2305 	encode_compound_hdr(xdr, req, &hdr);
2306 	encode_sequence(xdr, &args->seq_args, &hdr);
2307 	encode_putfh(xdr, args->fh, &hdr);
2308 	encode_getfattr(xdr, args->bitmask, &hdr);
2309 	encode_nops(&hdr);
2310 }
2311 
2312 /*
2313  * Encode a CLOSE request
2314  */
2315 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2316 			       const void *data)
2317 {
2318 	const struct nfs_closeargs *args = data;
2319 	struct compound_hdr hdr = {
2320 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2321 	};
2322 
2323 	encode_compound_hdr(xdr, req, &hdr);
2324 	encode_sequence(xdr, &args->seq_args, &hdr);
2325 	encode_putfh(xdr, args->fh, &hdr);
2326 	if (args->lr_args)
2327 		encode_layoutreturn(xdr, args->lr_args, &hdr);
2328 	if (args->bitmask != NULL)
2329 		encode_getfattr(xdr, args->bitmask, &hdr);
2330 	encode_close(xdr, args, &hdr);
2331 	encode_nops(&hdr);
2332 }
2333 
2334 /*
2335  * Encode an OPEN request
2336  */
2337 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2338 			      const void *data)
2339 {
2340 	const struct nfs_openargs *args = data;
2341 	struct compound_hdr hdr = {
2342 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2343 	};
2344 
2345 	encode_compound_hdr(xdr, req, &hdr);
2346 	encode_sequence(xdr, &args->seq_args, &hdr);
2347 	encode_putfh(xdr, args->fh, &hdr);
2348 	encode_open(xdr, args, &hdr);
2349 	encode_getfh(xdr, &hdr);
2350 	if (args->access)
2351 		encode_access(xdr, args->access, &hdr);
2352 	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2353 	if (args->lg_args) {
2354 		encode_layoutget(xdr, args->lg_args, &hdr);
2355 		rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2356 					args->lg_args->layout.pglen,
2357 					hdr.replen - pagepad_maxsz);
2358 	}
2359 	encode_nops(&hdr);
2360 }
2361 
2362 /*
2363  * Encode an OPEN_CONFIRM request
2364  */
2365 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2366 				      struct xdr_stream *xdr,
2367 				      const void *data)
2368 {
2369 	const struct nfs_open_confirmargs *args = data;
2370 	struct compound_hdr hdr = {
2371 		.nops   = 0,
2372 	};
2373 
2374 	encode_compound_hdr(xdr, req, &hdr);
2375 	encode_putfh(xdr, args->fh, &hdr);
2376 	encode_open_confirm(xdr, args, &hdr);
2377 	encode_nops(&hdr);
2378 }
2379 
2380 /*
2381  * Encode an OPEN request with no attributes.
2382  */
2383 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2384 				     struct xdr_stream *xdr,
2385 				     const void *data)
2386 {
2387 	const struct nfs_openargs *args = data;
2388 	struct compound_hdr hdr = {
2389 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2390 	};
2391 
2392 	encode_compound_hdr(xdr, req, &hdr);
2393 	encode_sequence(xdr, &args->seq_args, &hdr);
2394 	encode_putfh(xdr, args->fh, &hdr);
2395 	encode_open(xdr, args, &hdr);
2396 	if (args->access)
2397 		encode_access(xdr, args->access, &hdr);
2398 	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2399 	if (args->lg_args) {
2400 		encode_layoutget(xdr, args->lg_args, &hdr);
2401 		rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2402 					args->lg_args->layout.pglen,
2403 					hdr.replen - pagepad_maxsz);
2404 	}
2405 	encode_nops(&hdr);
2406 }
2407 
2408 /*
2409  * Encode an OPEN_DOWNGRADE request
2410  */
2411 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2412 					struct xdr_stream *xdr,
2413 					const void *data)
2414 {
2415 	const struct nfs_closeargs *args = data;
2416 	struct compound_hdr hdr = {
2417 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2418 	};
2419 
2420 	encode_compound_hdr(xdr, req, &hdr);
2421 	encode_sequence(xdr, &args->seq_args, &hdr);
2422 	encode_putfh(xdr, args->fh, &hdr);
2423 	if (args->lr_args)
2424 		encode_layoutreturn(xdr, args->lr_args, &hdr);
2425 	encode_open_downgrade(xdr, args, &hdr);
2426 	encode_nops(&hdr);
2427 }
2428 
2429 /*
2430  * Encode a LOCK request
2431  */
2432 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2433 			      const void *data)
2434 {
2435 	const struct nfs_lock_args *args = data;
2436 	struct compound_hdr hdr = {
2437 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2438 	};
2439 
2440 	encode_compound_hdr(xdr, req, &hdr);
2441 	encode_sequence(xdr, &args->seq_args, &hdr);
2442 	encode_putfh(xdr, args->fh, &hdr);
2443 	encode_lock(xdr, args, &hdr);
2444 	encode_nops(&hdr);
2445 }
2446 
2447 /*
2448  * Encode a LOCKT request
2449  */
2450 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2451 			       const void *data)
2452 {
2453 	const struct nfs_lockt_args *args = data;
2454 	struct compound_hdr hdr = {
2455 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2456 	};
2457 
2458 	encode_compound_hdr(xdr, req, &hdr);
2459 	encode_sequence(xdr, &args->seq_args, &hdr);
2460 	encode_putfh(xdr, args->fh, &hdr);
2461 	encode_lockt(xdr, args, &hdr);
2462 	encode_nops(&hdr);
2463 }
2464 
2465 /*
2466  * Encode a LOCKU request
2467  */
2468 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2469 			       const void *data)
2470 {
2471 	const struct nfs_locku_args *args = data;
2472 	struct compound_hdr hdr = {
2473 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2474 	};
2475 
2476 	encode_compound_hdr(xdr, req, &hdr);
2477 	encode_sequence(xdr, &args->seq_args, &hdr);
2478 	encode_putfh(xdr, args->fh, &hdr);
2479 	encode_locku(xdr, args, &hdr);
2480 	encode_nops(&hdr);
2481 }
2482 
2483 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2484 					   struct xdr_stream *xdr,
2485 					   const void *data)
2486 {
2487 	const struct nfs_release_lockowner_args *args = data;
2488 	struct compound_hdr hdr = {
2489 		.minorversion = 0,
2490 	};
2491 
2492 	encode_compound_hdr(xdr, req, &hdr);
2493 	encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2494 	encode_nops(&hdr);
2495 }
2496 
2497 /*
2498  * Encode a READLINK request
2499  */
2500 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2501 				  const void *data)
2502 {
2503 	const struct nfs4_readlink *args = data;
2504 	struct compound_hdr hdr = {
2505 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2506 	};
2507 
2508 	encode_compound_hdr(xdr, req, &hdr);
2509 	encode_sequence(xdr, &args->seq_args, &hdr);
2510 	encode_putfh(xdr, args->fh, &hdr);
2511 	encode_readlink(xdr, args, req, &hdr);
2512 
2513 	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2514 				args->pglen, hdr.replen - pagepad_maxsz);
2515 	encode_nops(&hdr);
2516 }
2517 
2518 /*
2519  * Encode a READDIR request
2520  */
2521 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2522 				 const void *data)
2523 {
2524 	const struct nfs4_readdir_arg *args = data;
2525 	struct compound_hdr hdr = {
2526 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2527 	};
2528 
2529 	encode_compound_hdr(xdr, req, &hdr);
2530 	encode_sequence(xdr, &args->seq_args, &hdr);
2531 	encode_putfh(xdr, args->fh, &hdr);
2532 	encode_readdir(xdr, args, req, &hdr);
2533 
2534 	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2535 				args->count, hdr.replen - pagepad_maxsz);
2536 	encode_nops(&hdr);
2537 }
2538 
2539 /*
2540  * Encode a READ request
2541  */
2542 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2543 			      const void *data)
2544 {
2545 	const struct nfs_pgio_args *args = data;
2546 	struct compound_hdr hdr = {
2547 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2548 	};
2549 
2550 	encode_compound_hdr(xdr, req, &hdr);
2551 	encode_sequence(xdr, &args->seq_args, &hdr);
2552 	encode_putfh(xdr, args->fh, &hdr);
2553 	encode_read(xdr, args, &hdr);
2554 
2555 	rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2556 				args->count, hdr.replen - pagepad_maxsz);
2557 	req->rq_rcv_buf.flags |= XDRBUF_READ;
2558 	encode_nops(&hdr);
2559 }
2560 
2561 /*
2562  * Encode an SETATTR request
2563  */
2564 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2565 				 const void *data)
2566 {
2567 	const struct nfs_setattrargs *args = data;
2568 	struct compound_hdr hdr = {
2569 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2570 	};
2571 
2572 	encode_compound_hdr(xdr, req, &hdr);
2573 	encode_sequence(xdr, &args->seq_args, &hdr);
2574 	encode_putfh(xdr, args->fh, &hdr);
2575 	encode_setattr(xdr, args, args->server, &hdr);
2576 	encode_getfattr(xdr, args->bitmask, &hdr);
2577 	encode_nops(&hdr);
2578 }
2579 
2580 /*
2581  * Encode a GETACL request
2582  */
2583 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2584 				const void *data)
2585 {
2586 	const struct nfs_getaclargs *args = data;
2587 	struct compound_hdr hdr = {
2588 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2589 	};
2590 	const __u32 nfs4_acl_bitmap[1] = {
2591 		[0] = FATTR4_WORD0_ACL,
2592 	};
2593 	uint32_t replen;
2594 
2595 	encode_compound_hdr(xdr, req, &hdr);
2596 	encode_sequence(xdr, &args->seq_args, &hdr);
2597 	encode_putfh(xdr, args->fh, &hdr);
2598 	replen = hdr.replen + op_decode_hdr_maxsz;
2599 	encode_getattr(xdr, nfs4_acl_bitmap, NULL,
2600 			ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
2601 
2602 	rpc_prepare_reply_pages(req, args->acl_pages, 0,
2603 				args->acl_len, replen);
2604 	encode_nops(&hdr);
2605 }
2606 
2607 /*
2608  * Encode a WRITE request
2609  */
2610 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2611 			       const void *data)
2612 {
2613 	const struct nfs_pgio_args *args = data;
2614 	struct compound_hdr hdr = {
2615 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2616 	};
2617 
2618 	encode_compound_hdr(xdr, req, &hdr);
2619 	encode_sequence(xdr, &args->seq_args, &hdr);
2620 	encode_putfh(xdr, args->fh, &hdr);
2621 	encode_write(xdr, args, &hdr);
2622 	req->rq_snd_buf.flags |= XDRBUF_WRITE;
2623 	if (args->bitmask)
2624 		encode_getfattr(xdr, args->bitmask, &hdr);
2625 	encode_nops(&hdr);
2626 }
2627 
2628 /*
2629  *  a COMMIT request
2630  */
2631 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2632 				const void *data)
2633 {
2634 	const struct nfs_commitargs *args = data;
2635 	struct compound_hdr hdr = {
2636 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2637 	};
2638 
2639 	encode_compound_hdr(xdr, req, &hdr);
2640 	encode_sequence(xdr, &args->seq_args, &hdr);
2641 	encode_putfh(xdr, args->fh, &hdr);
2642 	encode_commit(xdr, args, &hdr);
2643 	encode_nops(&hdr);
2644 }
2645 
2646 /*
2647  * FSINFO request
2648  */
2649 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2650 				const void *data)
2651 {
2652 	const struct nfs4_fsinfo_arg *args = data;
2653 	struct compound_hdr hdr = {
2654 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2655 	};
2656 
2657 	encode_compound_hdr(xdr, req, &hdr);
2658 	encode_sequence(xdr, &args->seq_args, &hdr);
2659 	encode_putfh(xdr, args->fh, &hdr);
2660 	encode_fsinfo(xdr, args->bitmask, &hdr);
2661 	encode_nops(&hdr);
2662 }
2663 
2664 /*
2665  * a PATHCONF request
2666  */
2667 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2668 				  const void *data)
2669 {
2670 	const struct nfs4_pathconf_arg *args = data;
2671 	struct compound_hdr hdr = {
2672 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2673 	};
2674 
2675 	encode_compound_hdr(xdr, req, &hdr);
2676 	encode_sequence(xdr, &args->seq_args, &hdr);
2677 	encode_putfh(xdr, args->fh, &hdr);
2678 	encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
2679 			ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
2680 	encode_nops(&hdr);
2681 }
2682 
2683 /*
2684  * a STATFS request
2685  */
2686 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2687 				const void *data)
2688 {
2689 	const struct nfs4_statfs_arg *args = data;
2690 	struct compound_hdr hdr = {
2691 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2692 	};
2693 
2694 	encode_compound_hdr(xdr, req, &hdr);
2695 	encode_sequence(xdr, &args->seq_args, &hdr);
2696 	encode_putfh(xdr, args->fh, &hdr);
2697 	encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
2698 			ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
2699 	encode_nops(&hdr);
2700 }
2701 
2702 /*
2703  * GETATTR_BITMAP request
2704  */
2705 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2706 				     struct xdr_stream *xdr,
2707 				     const void *data)
2708 {
2709 	const struct nfs4_server_caps_arg *args = data;
2710 	const u32 *bitmask = args->bitmask;
2711 	struct compound_hdr hdr = {
2712 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2713 	};
2714 
2715 	encode_compound_hdr(xdr, req, &hdr);
2716 	encode_sequence(xdr, &args->seq_args, &hdr);
2717 	encode_putfh(xdr, args->fhandle, &hdr);
2718 	encode_getattr(xdr, bitmask, NULL, 3, &hdr);
2719 	encode_nops(&hdr);
2720 }
2721 
2722 /*
2723  * a RENEW request
2724  */
2725 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2726 			       const void *data)
2727 
2728 {
2729 	const struct nfs_client *clp = data;
2730 	struct compound_hdr hdr = {
2731 		.nops	= 0,
2732 	};
2733 
2734 	encode_compound_hdr(xdr, req, &hdr);
2735 	encode_renew(xdr, clp->cl_clientid, &hdr);
2736 	encode_nops(&hdr);
2737 }
2738 
2739 /*
2740  * a SETCLIENTID request
2741  */
2742 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2743 				     struct xdr_stream *xdr,
2744 				     const void *data)
2745 {
2746 	const struct nfs4_setclientid *sc = data;
2747 	struct compound_hdr hdr = {
2748 		.nops	= 0,
2749 	};
2750 
2751 	encode_compound_hdr(xdr, req, &hdr);
2752 	encode_setclientid(xdr, sc, &hdr);
2753 	encode_nops(&hdr);
2754 }
2755 
2756 /*
2757  * a SETCLIENTID_CONFIRM request
2758  */
2759 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2760 					     struct xdr_stream *xdr,
2761 					     const void *data)
2762 {
2763 	const struct nfs4_setclientid_res *arg = data;
2764 	struct compound_hdr hdr = {
2765 		.nops	= 0,
2766 	};
2767 
2768 	encode_compound_hdr(xdr, req, &hdr);
2769 	encode_setclientid_confirm(xdr, arg, &hdr);
2770 	encode_nops(&hdr);
2771 }
2772 
2773 /*
2774  * DELEGRETURN request
2775  */
2776 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2777 				     struct xdr_stream *xdr,
2778 				     const void *data)
2779 {
2780 	const struct nfs4_delegreturnargs *args = data;
2781 	struct compound_hdr hdr = {
2782 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2783 	};
2784 
2785 	encode_compound_hdr(xdr, req, &hdr);
2786 	encode_sequence(xdr, &args->seq_args, &hdr);
2787 	encode_putfh(xdr, args->fhandle, &hdr);
2788 	if (args->lr_args)
2789 		encode_layoutreturn(xdr, args->lr_args, &hdr);
2790 	if (args->bitmask)
2791 		encode_getfattr(xdr, args->bitmask, &hdr);
2792 	encode_delegreturn(xdr, args->stateid, &hdr);
2793 	encode_nops(&hdr);
2794 }
2795 
2796 /*
2797  * Encode FS_LOCATIONS request
2798  */
2799 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2800 				      struct xdr_stream *xdr,
2801 				      const void *data)
2802 {
2803 	const struct nfs4_fs_locations_arg *args = data;
2804 	struct compound_hdr hdr = {
2805 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2806 	};
2807 	uint32_t replen;
2808 
2809 	encode_compound_hdr(xdr, req, &hdr);
2810 	encode_sequence(xdr, &args->seq_args, &hdr);
2811 	if (args->migration) {
2812 		encode_putfh(xdr, args->fh, &hdr);
2813 		replen = hdr.replen;
2814 		encode_fs_locations(xdr, args->bitmask, &hdr);
2815 		if (args->renew)
2816 			encode_renew(xdr, args->clientid, &hdr);
2817 	} else {
2818 		encode_putfh(xdr, args->dir_fh, &hdr);
2819 		encode_lookup(xdr, args->name, &hdr);
2820 		replen = hdr.replen;
2821 		encode_fs_locations(xdr, args->bitmask, &hdr);
2822 	}
2823 
2824 	rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
2825 				PAGE_SIZE, replen);
2826 	encode_nops(&hdr);
2827 }
2828 
2829 /*
2830  * Encode SECINFO request
2831  */
2832 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2833 				struct xdr_stream *xdr,
2834 				const void *data)
2835 {
2836 	const struct nfs4_secinfo_arg *args = data;
2837 	struct compound_hdr hdr = {
2838 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2839 	};
2840 
2841 	encode_compound_hdr(xdr, req, &hdr);
2842 	encode_sequence(xdr, &args->seq_args, &hdr);
2843 	encode_putfh(xdr, args->dir_fh, &hdr);
2844 	encode_secinfo(xdr, args->name, &hdr);
2845 	encode_nops(&hdr);
2846 }
2847 
2848 /*
2849  * Encode FSID_PRESENT request
2850  */
2851 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2852 				      struct xdr_stream *xdr,
2853 				      const void *data)
2854 {
2855 	const struct nfs4_fsid_present_arg *args = data;
2856 	struct compound_hdr hdr = {
2857 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2858 	};
2859 
2860 	encode_compound_hdr(xdr, req, &hdr);
2861 	encode_sequence(xdr, &args->seq_args, &hdr);
2862 	encode_putfh(xdr, args->fh, &hdr);
2863 	encode_getfh(xdr, &hdr);
2864 	if (args->renew)
2865 		encode_renew(xdr, args->clientid, &hdr);
2866 	encode_nops(&hdr);
2867 }
2868 
2869 #if defined(CONFIG_NFS_V4_1)
2870 /*
2871  * BIND_CONN_TO_SESSION request
2872  */
2873 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2874 				struct xdr_stream *xdr,
2875 				const void *data)
2876 {
2877 	const struct nfs41_bind_conn_to_session_args *args = data;
2878 	struct compound_hdr hdr = {
2879 		.minorversion = args->client->cl_mvops->minor_version,
2880 	};
2881 
2882 	encode_compound_hdr(xdr, req, &hdr);
2883 	encode_bind_conn_to_session(xdr, args, &hdr);
2884 	encode_nops(&hdr);
2885 }
2886 
2887 /*
2888  * EXCHANGE_ID request
2889  */
2890 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2891 				     struct xdr_stream *xdr,
2892 				     const void *data)
2893 {
2894 	const struct nfs41_exchange_id_args *args = data;
2895 	struct compound_hdr hdr = {
2896 		.minorversion = args->client->cl_mvops->minor_version,
2897 	};
2898 
2899 	encode_compound_hdr(xdr, req, &hdr);
2900 	encode_exchange_id(xdr, args, &hdr);
2901 	encode_nops(&hdr);
2902 }
2903 
2904 /*
2905  * a CREATE_SESSION request
2906  */
2907 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2908 					struct xdr_stream *xdr,
2909 					const void *data)
2910 {
2911 	const struct nfs41_create_session_args *args = data;
2912 	struct compound_hdr hdr = {
2913 		.minorversion = args->client->cl_mvops->minor_version,
2914 	};
2915 
2916 	encode_compound_hdr(xdr, req, &hdr);
2917 	encode_create_session(xdr, args, &hdr);
2918 	encode_nops(&hdr);
2919 }
2920 
2921 /*
2922  * a DESTROY_SESSION request
2923  */
2924 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2925 					 struct xdr_stream *xdr,
2926 					 const void *data)
2927 {
2928 	const struct nfs4_session *session = data;
2929 	struct compound_hdr hdr = {
2930 		.minorversion = session->clp->cl_mvops->minor_version,
2931 	};
2932 
2933 	encode_compound_hdr(xdr, req, &hdr);
2934 	encode_destroy_session(xdr, session, &hdr);
2935 	encode_nops(&hdr);
2936 }
2937 
2938 /*
2939  * a DESTROY_CLIENTID request
2940  */
2941 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2942 					 struct xdr_stream *xdr,
2943 					 const void *data)
2944 {
2945 	const struct nfs_client *clp = data;
2946 	struct compound_hdr hdr = {
2947 		.minorversion = clp->cl_mvops->minor_version,
2948 	};
2949 
2950 	encode_compound_hdr(xdr, req, &hdr);
2951 	encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2952 	encode_nops(&hdr);
2953 }
2954 
2955 /*
2956  * a SEQUENCE request
2957  */
2958 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2959 				  const void *data)
2960 {
2961 	const struct nfs4_sequence_args *args = data;
2962 	struct compound_hdr hdr = {
2963 		.minorversion = nfs4_xdr_minorversion(args),
2964 	};
2965 
2966 	encode_compound_hdr(xdr, req, &hdr);
2967 	encode_sequence(xdr, args, &hdr);
2968 	encode_nops(&hdr);
2969 }
2970 
2971 #endif
2972 
2973 /*
2974  * a GET_LEASE_TIME request
2975  */
2976 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2977 					struct xdr_stream *xdr,
2978 					const void *data)
2979 {
2980 	const struct nfs4_get_lease_time_args *args = data;
2981 	struct compound_hdr hdr = {
2982 		.minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2983 	};
2984 	const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2985 
2986 	encode_compound_hdr(xdr, req, &hdr);
2987 	encode_sequence(xdr, &args->la_seq_args, &hdr);
2988 	encode_putrootfh(xdr, &hdr);
2989 	encode_fsinfo(xdr, lease_bitmap, &hdr);
2990 	encode_nops(&hdr);
2991 }
2992 
2993 #ifdef CONFIG_NFS_V4_1
2994 
2995 /*
2996  * a RECLAIM_COMPLETE request
2997  */
2998 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2999 					  struct xdr_stream *xdr,
3000 					  const void *data)
3001 {
3002 	const struct nfs41_reclaim_complete_args *args = data;
3003 	struct compound_hdr hdr = {
3004 		.minorversion = nfs4_xdr_minorversion(&args->seq_args)
3005 	};
3006 
3007 	encode_compound_hdr(xdr, req, &hdr);
3008 	encode_sequence(xdr, &args->seq_args, &hdr);
3009 	encode_reclaim_complete(xdr, args, &hdr);
3010 	encode_nops(&hdr);
3011 }
3012 
3013 /*
3014  * Encode GETDEVICEINFO request
3015  */
3016 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
3017 				       struct xdr_stream *xdr,
3018 				       const void *data)
3019 {
3020 	const struct nfs4_getdeviceinfo_args *args = data;
3021 	struct compound_hdr hdr = {
3022 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3023 	};
3024 	uint32_t replen;
3025 
3026 	encode_compound_hdr(xdr, req, &hdr);
3027 	encode_sequence(xdr, &args->seq_args, &hdr);
3028 
3029 	replen = hdr.replen + op_decode_hdr_maxsz + 2;
3030 
3031 	encode_getdeviceinfo(xdr, args, &hdr);
3032 
3033 	/* set up reply kvec. device_addr4 opaque data is read into the
3034 	 * pages */
3035 	rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
3036 				args->pdev->pglen, replen);
3037 	encode_nops(&hdr);
3038 }
3039 
3040 /*
3041  *  Encode LAYOUTGET request
3042  */
3043 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
3044 				   struct xdr_stream *xdr,
3045 				   const void *data)
3046 {
3047 	const struct nfs4_layoutget_args *args = data;
3048 	struct compound_hdr hdr = {
3049 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3050 	};
3051 
3052 	encode_compound_hdr(xdr, req, &hdr);
3053 	encode_sequence(xdr, &args->seq_args, &hdr);
3054 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3055 	encode_layoutget(xdr, args, &hdr);
3056 
3057 	rpc_prepare_reply_pages(req, args->layout.pages, 0,
3058 				args->layout.pglen, hdr.replen - pagepad_maxsz);
3059 	encode_nops(&hdr);
3060 }
3061 
3062 /*
3063  *  Encode LAYOUTCOMMIT request
3064  */
3065 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
3066 				      struct xdr_stream *xdr,
3067 				      const void *priv)
3068 {
3069 	const struct nfs4_layoutcommit_args *args = priv;
3070 	struct nfs4_layoutcommit_data *data =
3071 		container_of(args, struct nfs4_layoutcommit_data, args);
3072 	struct compound_hdr hdr = {
3073 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3074 	};
3075 
3076 	encode_compound_hdr(xdr, req, &hdr);
3077 	encode_sequence(xdr, &args->seq_args, &hdr);
3078 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3079 	encode_layoutcommit(xdr, data->args.inode, args, &hdr);
3080 	encode_getfattr(xdr, args->bitmask, &hdr);
3081 	encode_nops(&hdr);
3082 }
3083 
3084 /*
3085  * Encode LAYOUTRETURN request
3086  */
3087 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
3088 				      struct xdr_stream *xdr,
3089 				      const void *data)
3090 {
3091 	const struct nfs4_layoutreturn_args *args = data;
3092 	struct compound_hdr hdr = {
3093 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3094 	};
3095 
3096 	encode_compound_hdr(xdr, req, &hdr);
3097 	encode_sequence(xdr, &args->seq_args, &hdr);
3098 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3099 	encode_layoutreturn(xdr, args, &hdr);
3100 	encode_nops(&hdr);
3101 }
3102 
3103 /*
3104  * Encode SECINFO_NO_NAME request
3105  */
3106 static void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3107 					struct xdr_stream *xdr,
3108 					const void *data)
3109 {
3110 	const struct nfs41_secinfo_no_name_args *args = data;
3111 	struct compound_hdr hdr = {
3112 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3113 	};
3114 
3115 	encode_compound_hdr(xdr, req, &hdr);
3116 	encode_sequence(xdr, &args->seq_args, &hdr);
3117 	encode_putrootfh(xdr, &hdr);
3118 	encode_secinfo_no_name(xdr, args, &hdr);
3119 	encode_nops(&hdr);
3120 }
3121 
3122 /*
3123  *  Encode TEST_STATEID request
3124  */
3125 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3126 				      struct xdr_stream *xdr,
3127 				      const void *data)
3128 {
3129 	const struct nfs41_test_stateid_args *args = data;
3130 	struct compound_hdr hdr = {
3131 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3132 	};
3133 
3134 	encode_compound_hdr(xdr, req, &hdr);
3135 	encode_sequence(xdr, &args->seq_args, &hdr);
3136 	encode_test_stateid(xdr, args, &hdr);
3137 	encode_nops(&hdr);
3138 }
3139 
3140 /*
3141  *  Encode FREE_STATEID request
3142  */
3143 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3144 				     struct xdr_stream *xdr,
3145 				     const void *data)
3146 {
3147 	const struct nfs41_free_stateid_args *args = data;
3148 	struct compound_hdr hdr = {
3149 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3150 	};
3151 
3152 	encode_compound_hdr(xdr, req, &hdr);
3153 	encode_sequence(xdr, &args->seq_args, &hdr);
3154 	encode_free_stateid(xdr, args, &hdr);
3155 	encode_nops(&hdr);
3156 }
3157 #endif /* CONFIG_NFS_V4_1 */
3158 
3159 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3160 {
3161 	ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
3162 			NFS4_OPAQUE_LIMIT);
3163 	if (unlikely(ret < 0))
3164 		return -EIO;
3165 	*len = ret;
3166 	return 0;
3167 }
3168 
3169 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3170 {
3171 	__be32 *p;
3172 
3173 	p = xdr_inline_decode(xdr, 8);
3174 	if (unlikely(!p))
3175 		return -EIO;
3176 	hdr->status = be32_to_cpup(p++);
3177 	hdr->taglen = be32_to_cpup(p);
3178 
3179 	p = xdr_inline_decode(xdr, hdr->taglen + 4);
3180 	if (unlikely(!p))
3181 		return -EIO;
3182 	hdr->tag = (char *)p;
3183 	p += XDR_QUADLEN(hdr->taglen);
3184 	hdr->nops = be32_to_cpup(p);
3185 	if (unlikely(hdr->nops < 1))
3186 		return nfs4_stat_to_errno(hdr->status);
3187 	return 0;
3188 }
3189 
3190 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3191 		int *nfs_retval)
3192 {
3193 	__be32 *p;
3194 	uint32_t opnum;
3195 	int32_t nfserr;
3196 
3197 	p = xdr_inline_decode(xdr, 8);
3198 	if (unlikely(!p))
3199 		goto out_overflow;
3200 	opnum = be32_to_cpup(p++);
3201 	if (unlikely(opnum != expected))
3202 		goto out_bad_operation;
3203 	if (unlikely(*p != cpu_to_be32(NFS_OK)))
3204 		goto out_status;
3205 	*nfs_retval = 0;
3206 	return true;
3207 out_status:
3208 	nfserr = be32_to_cpup(p);
3209 	trace_nfs4_xdr_status(xdr, opnum, nfserr);
3210 	*nfs_retval = nfs4_stat_to_errno(nfserr);
3211 	return true;
3212 out_bad_operation:
3213 	trace_nfs4_xdr_bad_operation(xdr, opnum, expected);
3214 	*nfs_retval = -EREMOTEIO;
3215 	return false;
3216 out_overflow:
3217 	*nfs_retval = -EIO;
3218 	return false;
3219 }
3220 
3221 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3222 {
3223 	int retval;
3224 
3225 	__decode_op_hdr(xdr, expected, &retval);
3226 	return retval;
3227 }
3228 
3229 /* Dummy routine */
3230 static int decode_ace(struct xdr_stream *xdr, void *ace)
3231 {
3232 	__be32 *p;
3233 	unsigned int strlen;
3234 	char *str;
3235 
3236 	p = xdr_inline_decode(xdr, 12);
3237 	if (unlikely(!p))
3238 		return -EIO;
3239 	return decode_opaque_inline(xdr, &strlen, &str);
3240 }
3241 
3242 static ssize_t
3243 decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
3244 {
3245 	ssize_t ret;
3246 
3247 	ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
3248 	if (likely(ret >= 0))
3249 		return ret;
3250 	if (ret != -EMSGSIZE)
3251 		return -EIO;
3252 	return sz;
3253 }
3254 
3255 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3256 {
3257 	ssize_t ret;
3258 	ret = decode_bitmap4(xdr, bitmap, 3);
3259 	return ret < 0 ? ret : 0;
3260 }
3261 
3262 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3263 {
3264 	__be32 *p;
3265 
3266 	p = xdr_inline_decode(xdr, 4);
3267 	if (unlikely(!p))
3268 		return -EIO;
3269 	*attrlen = be32_to_cpup(p);
3270 	*savep = xdr_stream_pos(xdr);
3271 	return 0;
3272 }
3273 
3274 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3275 {
3276 	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3277 		int ret;
3278 		ret = decode_attr_bitmap(xdr, bitmask);
3279 		if (unlikely(ret < 0))
3280 			return ret;
3281 		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3282 	} else
3283 		bitmask[0] = bitmask[1] = bitmask[2] = 0;
3284 	dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3285 		bitmask[0], bitmask[1], bitmask[2]);
3286 	return 0;
3287 }
3288 
3289 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3290 {
3291 	__be32 *p;
3292 	int ret = 0;
3293 
3294 	*type = 0;
3295 	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3296 		return -EIO;
3297 	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3298 		p = xdr_inline_decode(xdr, 4);
3299 		if (unlikely(!p))
3300 			return -EIO;
3301 		*type = be32_to_cpup(p);
3302 		if (*type < NF4REG || *type > NF4NAMEDATTR) {
3303 			dprintk("%s: bad type %d\n", __func__, *type);
3304 			return -EIO;
3305 		}
3306 		bitmap[0] &= ~FATTR4_WORD0_TYPE;
3307 		ret = NFS_ATTR_FATTR_TYPE;
3308 	}
3309 	dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3310 	return ret;
3311 }
3312 
3313 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3314 				      uint32_t *bitmap, uint32_t *type)
3315 {
3316 	__be32 *p;
3317 
3318 	*type = 0;
3319 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3320 		return -EIO;
3321 	if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3322 		p = xdr_inline_decode(xdr, 4);
3323 		if (unlikely(!p))
3324 			return -EIO;
3325 		*type = be32_to_cpup(p);
3326 		bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3327 	}
3328 	dprintk("%s: expire type=0x%x\n", __func__, *type);
3329 	return 0;
3330 }
3331 
3332 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3333 {
3334 	__be32 *p;
3335 	int ret = 0;
3336 
3337 	*change = 0;
3338 	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3339 		return -EIO;
3340 	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3341 		p = xdr_inline_decode(xdr, 8);
3342 		if (unlikely(!p))
3343 			return -EIO;
3344 		xdr_decode_hyper(p, change);
3345 		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3346 		ret = NFS_ATTR_FATTR_CHANGE;
3347 	}
3348 	dprintk("%s: change attribute=%Lu\n", __func__,
3349 			(unsigned long long)*change);
3350 	return ret;
3351 }
3352 
3353 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3354 {
3355 	__be32 *p;
3356 	int ret = 0;
3357 
3358 	*size = 0;
3359 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3360 		return -EIO;
3361 	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3362 		p = xdr_inline_decode(xdr, 8);
3363 		if (unlikely(!p))
3364 			return -EIO;
3365 		xdr_decode_hyper(p, size);
3366 		bitmap[0] &= ~FATTR4_WORD0_SIZE;
3367 		ret = NFS_ATTR_FATTR_SIZE;
3368 	}
3369 	dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3370 	return ret;
3371 }
3372 
3373 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3374 {
3375 	__be32 *p;
3376 
3377 	*res = 0;
3378 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3379 		return -EIO;
3380 	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3381 		p = xdr_inline_decode(xdr, 4);
3382 		if (unlikely(!p))
3383 			return -EIO;
3384 		*res = be32_to_cpup(p);
3385 		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3386 	}
3387 	dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3388 	return 0;
3389 }
3390 
3391 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3392 {
3393 	__be32 *p;
3394 
3395 	*res = 0;
3396 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3397 		return -EIO;
3398 	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3399 		p = xdr_inline_decode(xdr, 4);
3400 		if (unlikely(!p))
3401 			return -EIO;
3402 		*res = be32_to_cpup(p);
3403 		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3404 	}
3405 	dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3406 	return 0;
3407 }
3408 
3409 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3410 {
3411 	__be32 *p;
3412 	int ret = 0;
3413 
3414 	fsid->major = 0;
3415 	fsid->minor = 0;
3416 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3417 		return -EIO;
3418 	if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3419 		p = xdr_inline_decode(xdr, 16);
3420 		if (unlikely(!p))
3421 			return -EIO;
3422 		p = xdr_decode_hyper(p, &fsid->major);
3423 		xdr_decode_hyper(p, &fsid->minor);
3424 		bitmap[0] &= ~FATTR4_WORD0_FSID;
3425 		ret = NFS_ATTR_FATTR_FSID;
3426 	}
3427 	dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3428 			(unsigned long long)fsid->major,
3429 			(unsigned long long)fsid->minor);
3430 	return ret;
3431 }
3432 
3433 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3434 {
3435 	__be32 *p;
3436 
3437 	*res = 60;
3438 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3439 		return -EIO;
3440 	if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3441 		p = xdr_inline_decode(xdr, 4);
3442 		if (unlikely(!p))
3443 			return -EIO;
3444 		*res = be32_to_cpup(p);
3445 		bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3446 	}
3447 	dprintk("%s: lease time=%u\n", __func__, (unsigned int)*res);
3448 	return 0;
3449 }
3450 
3451 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3452 {
3453 	__be32 *p;
3454 
3455 	if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3456 		return -EIO;
3457 	if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3458 		p = xdr_inline_decode(xdr, 4);
3459 		if (unlikely(!p))
3460 			return -EIO;
3461 		bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3462 		*res = -be32_to_cpup(p);
3463 	}
3464 	return 0;
3465 }
3466 
3467 static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
3468 				 uint32_t *bitmap, uint32_t *bitmask)
3469 {
3470 	if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
3471 		int ret;
3472 		ret = decode_attr_bitmap(xdr, bitmask);
3473 		if (unlikely(ret < 0))
3474 			return ret;
3475 		bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3476 	} else
3477 		bitmask[0] = bitmask[1] = bitmask[2] = 0;
3478 	dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3479 		bitmask[0], bitmask[1], bitmask[2]);
3480 	return 0;
3481 }
3482 
3483 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3484 {
3485 	__be32 *p;
3486 	u32 len;
3487 
3488 	if (fh != NULL)
3489 		memset(fh, 0, sizeof(*fh));
3490 
3491 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3492 		return -EIO;
3493 	if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3494 		p = xdr_inline_decode(xdr, 4);
3495 		if (unlikely(!p))
3496 			return -EIO;
3497 		len = be32_to_cpup(p);
3498 		if (len > NFS4_FHSIZE || len == 0) {
3499 			trace_nfs4_xdr_bad_filehandle(xdr, OP_READDIR,
3500 						      NFS4ERR_BADHANDLE);
3501 			return -EREMOTEIO;
3502 		}
3503 		p = xdr_inline_decode(xdr, len);
3504 		if (unlikely(!p))
3505 			return -EIO;
3506 		if (fh != NULL) {
3507 			memcpy(fh->data, p, len);
3508 			fh->size = len;
3509 		}
3510 		bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3511 	}
3512 	return 0;
3513 }
3514 
3515 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3516 {
3517 	__be32 *p;
3518 
3519 	*res = 0;
3520 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3521 		return -EIO;
3522 	if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3523 		p = xdr_inline_decode(xdr, 4);
3524 		if (unlikely(!p))
3525 			return -EIO;
3526 		*res = be32_to_cpup(p);
3527 		bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3528 	}
3529 	dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3530 	return 0;
3531 }
3532 
3533 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3534 {
3535 	__be32 *p;
3536 	int ret = 0;
3537 
3538 	*fileid = 0;
3539 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3540 		return -EIO;
3541 	if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3542 		p = xdr_inline_decode(xdr, 8);
3543 		if (unlikely(!p))
3544 			return -EIO;
3545 		xdr_decode_hyper(p, fileid);
3546 		bitmap[0] &= ~FATTR4_WORD0_FILEID;
3547 		ret = NFS_ATTR_FATTR_FILEID;
3548 	}
3549 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3550 	return ret;
3551 }
3552 
3553 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3554 {
3555 	__be32 *p;
3556 	int ret = 0;
3557 
3558 	*fileid = 0;
3559 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3560 		return -EIO;
3561 	if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3562 		p = xdr_inline_decode(xdr, 8);
3563 		if (unlikely(!p))
3564 			return -EIO;
3565 		xdr_decode_hyper(p, fileid);
3566 		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3567 		ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3568 	}
3569 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3570 	return ret;
3571 }
3572 
3573 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3574 {
3575 	__be32 *p;
3576 	int status = 0;
3577 
3578 	*res = 0;
3579 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3580 		return -EIO;
3581 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3582 		p = xdr_inline_decode(xdr, 8);
3583 		if (unlikely(!p))
3584 			return -EIO;
3585 		xdr_decode_hyper(p, res);
3586 		bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3587 	}
3588 	dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3589 	return status;
3590 }
3591 
3592 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3593 {
3594 	__be32 *p;
3595 	int status = 0;
3596 
3597 	*res = 0;
3598 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3599 		return -EIO;
3600 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3601 		p = xdr_inline_decode(xdr, 8);
3602 		if (unlikely(!p))
3603 			return -EIO;
3604 		xdr_decode_hyper(p, res);
3605 		bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3606 	}
3607 	dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3608 	return status;
3609 }
3610 
3611 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3612 {
3613 	__be32 *p;
3614 	int status = 0;
3615 
3616 	*res = 0;
3617 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3618 		return -EIO;
3619 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3620 		p = xdr_inline_decode(xdr, 8);
3621 		if (unlikely(!p))
3622 			return -EIO;
3623 		xdr_decode_hyper(p, res);
3624 		bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3625 	}
3626 	dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3627 	return status;
3628 }
3629 
3630 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3631 {
3632 	u32 n;
3633 	__be32 *p;
3634 	int status = 0;
3635 
3636 	p = xdr_inline_decode(xdr, 4);
3637 	if (unlikely(!p))
3638 		return -EIO;
3639 	n = be32_to_cpup(p);
3640 	if (n == 0)
3641 		goto root_path;
3642 	dprintk("pathname4: ");
3643 	if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3644 		dprintk("cannot parse %d components in path\n", n);
3645 		goto out_eio;
3646 	}
3647 	for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3648 		struct nfs4_string *component = &path->components[path->ncomponents];
3649 		status = decode_opaque_inline(xdr, &component->len, &component->data);
3650 		if (unlikely(status != 0))
3651 			goto out_eio;
3652 		ifdebug (XDR)
3653 			pr_cont("%s%.*s ",
3654 				(path->ncomponents != n ? "/ " : ""),
3655 				component->len, component->data);
3656 	}
3657 out:
3658 	return status;
3659 root_path:
3660 /* a root pathname is sent as a zero component4 */
3661 	path->ncomponents = 1;
3662 	path->components[0].len=0;
3663 	path->components[0].data=NULL;
3664 	dprintk("pathname4: /\n");
3665 	goto out;
3666 out_eio:
3667 	dprintk(" status %d", status);
3668 	status = -EIO;
3669 	goto out;
3670 }
3671 
3672 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3673 {
3674 	int n;
3675 	__be32 *p;
3676 	int status = -EIO;
3677 
3678 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3679 		goto out;
3680 	status = 0;
3681 	if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3682 		goto out;
3683 	bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
3684 	status = -EIO;
3685 	/* Ignore borken servers that return unrequested attrs */
3686 	if (unlikely(res == NULL))
3687 		goto out;
3688 	dprintk("%s: fsroot:\n", __func__);
3689 	status = decode_pathname(xdr, &res->fs_path);
3690 	if (unlikely(status != 0))
3691 		goto out;
3692 	p = xdr_inline_decode(xdr, 4);
3693 	if (unlikely(!p))
3694 		goto out_eio;
3695 	n = be32_to_cpup(p);
3696 	if (n <= 0)
3697 		goto out_eio;
3698 	for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3699 		u32 m;
3700 		struct nfs4_fs_location *loc;
3701 
3702 		if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3703 			break;
3704 		loc = &res->locations[res->nlocations];
3705 		p = xdr_inline_decode(xdr, 4);
3706 		if (unlikely(!p))
3707 			goto out_eio;
3708 		m = be32_to_cpup(p);
3709 
3710 		dprintk("%s: servers:\n", __func__);
3711 		for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3712 			struct nfs4_string *server;
3713 
3714 			if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3715 				unsigned int i;
3716 				dprintk("%s: using first %u of %u servers "
3717 					"returned for location %u\n",
3718 						__func__,
3719 						NFS4_FS_LOCATION_MAXSERVERS,
3720 						m, res->nlocations);
3721 				for (i = loc->nservers; i < m; i++) {
3722 					unsigned int len;
3723 					char *data;
3724 					status = decode_opaque_inline(xdr, &len, &data);
3725 					if (unlikely(status != 0))
3726 						goto out_eio;
3727 				}
3728 				break;
3729 			}
3730 			server = &loc->servers[loc->nservers];
3731 			status = decode_opaque_inline(xdr, &server->len, &server->data);
3732 			if (unlikely(status != 0))
3733 				goto out_eio;
3734 			dprintk("%s ", server->data);
3735 		}
3736 		status = decode_pathname(xdr, &loc->rootpath);
3737 		if (unlikely(status != 0))
3738 			goto out_eio;
3739 	}
3740 	if (res->nlocations != 0)
3741 		status = NFS_ATTR_FATTR_V4_LOCATIONS;
3742 out:
3743 	dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3744 	return status;
3745 out_eio:
3746 	status = -EIO;
3747 	goto out;
3748 }
3749 
3750 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3751 {
3752 	__be32 *p;
3753 	int status = 0;
3754 
3755 	*res = 0;
3756 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3757 		return -EIO;
3758 	if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3759 		p = xdr_inline_decode(xdr, 8);
3760 		if (unlikely(!p))
3761 			return -EIO;
3762 		xdr_decode_hyper(p, res);
3763 		bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3764 	}
3765 	dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3766 	return status;
3767 }
3768 
3769 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3770 {
3771 	__be32 *p;
3772 	int status = 0;
3773 
3774 	*maxlink = 1;
3775 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3776 		return -EIO;
3777 	if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3778 		p = xdr_inline_decode(xdr, 4);
3779 		if (unlikely(!p))
3780 			return -EIO;
3781 		*maxlink = be32_to_cpup(p);
3782 		bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3783 	}
3784 	dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3785 	return status;
3786 }
3787 
3788 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3789 {
3790 	__be32 *p;
3791 	int status = 0;
3792 
3793 	*maxname = 1024;
3794 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3795 		return -EIO;
3796 	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3797 		p = xdr_inline_decode(xdr, 4);
3798 		if (unlikely(!p))
3799 			return -EIO;
3800 		*maxname = be32_to_cpup(p);
3801 		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3802 	}
3803 	dprintk("%s: maxname=%u\n", __func__, *maxname);
3804 	return status;
3805 }
3806 
3807 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3808 {
3809 	__be32 *p;
3810 	int status = 0;
3811 
3812 	*res = 1024;
3813 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3814 		return -EIO;
3815 	if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3816 		uint64_t maxread;
3817 		p = xdr_inline_decode(xdr, 8);
3818 		if (unlikely(!p))
3819 			return -EIO;
3820 		xdr_decode_hyper(p, &maxread);
3821 		if (maxread > 0x7FFFFFFF)
3822 			maxread = 0x7FFFFFFF;
3823 		*res = (uint32_t)maxread;
3824 		bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3825 	}
3826 	dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3827 	return status;
3828 }
3829 
3830 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3831 {
3832 	__be32 *p;
3833 	int status = 0;
3834 
3835 	*res = 1024;
3836 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3837 		return -EIO;
3838 	if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3839 		uint64_t maxwrite;
3840 		p = xdr_inline_decode(xdr, 8);
3841 		if (unlikely(!p))
3842 			return -EIO;
3843 		xdr_decode_hyper(p, &maxwrite);
3844 		if (maxwrite > 0x7FFFFFFF)
3845 			maxwrite = 0x7FFFFFFF;
3846 		*res = (uint32_t)maxwrite;
3847 		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3848 	}
3849 	dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3850 	return status;
3851 }
3852 
3853 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3854 {
3855 	uint32_t tmp;
3856 	__be32 *p;
3857 	int ret = 0;
3858 
3859 	*mode = 0;
3860 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3861 		return -EIO;
3862 	if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3863 		p = xdr_inline_decode(xdr, 4);
3864 		if (unlikely(!p))
3865 			return -EIO;
3866 		tmp = be32_to_cpup(p);
3867 		*mode = tmp & ~S_IFMT;
3868 		bitmap[1] &= ~FATTR4_WORD1_MODE;
3869 		ret = NFS_ATTR_FATTR_MODE;
3870 	}
3871 	dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3872 	return ret;
3873 }
3874 
3875 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3876 {
3877 	__be32 *p;
3878 	int ret = 0;
3879 
3880 	*nlink = 1;
3881 	if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3882 		return -EIO;
3883 	if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3884 		p = xdr_inline_decode(xdr, 4);
3885 		if (unlikely(!p))
3886 			return -EIO;
3887 		*nlink = be32_to_cpup(p);
3888 		bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3889 		ret = NFS_ATTR_FATTR_NLINK;
3890 	}
3891 	dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3892 	return ret;
3893 }
3894 
3895 static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
3896 		struct nfs4_string *name, gfp_t gfp_flags)
3897 {
3898 	ssize_t ret;
3899 
3900 	ret = xdr_stream_decode_string_dup(xdr, &name->data,
3901 			XDR_MAX_NETOBJ, gfp_flags);
3902 	name->len = 0;
3903 	if (ret > 0)
3904 		name->len = ret;
3905 	return ret;
3906 }
3907 
3908 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3909 		const struct nfs_server *server, kuid_t *uid,
3910 		struct nfs4_string *owner_name)
3911 {
3912 	ssize_t len;
3913 	char *p;
3914 
3915 	*uid = make_kuid(&init_user_ns, -2);
3916 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3917 		return -EIO;
3918 	if (!(bitmap[1] & FATTR4_WORD1_OWNER))
3919 		return 0;
3920 	bitmap[1] &= ~FATTR4_WORD1_OWNER;
3921 
3922 	if (owner_name != NULL) {
3923 		len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
3924 		if (len <= 0)
3925 			goto out;
3926 		dprintk("%s: name=%s\n", __func__, owner_name->data);
3927 		return NFS_ATTR_FATTR_OWNER_NAME;
3928 	} else {
3929 		len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3930 				XDR_MAX_NETOBJ);
3931 		if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
3932 			goto out;
3933 		dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3934 		return NFS_ATTR_FATTR_OWNER;
3935 	}
3936 out:
3937 	if (len == -EBADMSG)
3938 		return -EIO;
3939 	return 0;
3940 }
3941 
3942 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3943 		const struct nfs_server *server, kgid_t *gid,
3944 		struct nfs4_string *group_name)
3945 {
3946 	ssize_t len;
3947 	char *p;
3948 
3949 	*gid = make_kgid(&init_user_ns, -2);
3950 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3951 		return -EIO;
3952 	if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
3953 		return 0;
3954 	bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3955 
3956 	if (group_name != NULL) {
3957 		len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
3958 		if (len <= 0)
3959 			goto out;
3960 		dprintk("%s: name=%s\n", __func__, group_name->data);
3961 		return NFS_ATTR_FATTR_GROUP_NAME;
3962 	} else {
3963 		len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3964 				XDR_MAX_NETOBJ);
3965 		if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
3966 			goto out;
3967 		dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3968 		return NFS_ATTR_FATTR_GROUP;
3969 	}
3970 out:
3971 	if (len == -EBADMSG)
3972 		return -EIO;
3973 	return 0;
3974 }
3975 
3976 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3977 {
3978 	uint32_t major = 0, minor = 0;
3979 	__be32 *p;
3980 	int ret = 0;
3981 
3982 	*rdev = MKDEV(0,0);
3983 	if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3984 		return -EIO;
3985 	if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3986 		dev_t tmp;
3987 
3988 		p = xdr_inline_decode(xdr, 8);
3989 		if (unlikely(!p))
3990 			return -EIO;
3991 		major = be32_to_cpup(p++);
3992 		minor = be32_to_cpup(p);
3993 		tmp = MKDEV(major, minor);
3994 		if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3995 			*rdev = tmp;
3996 		bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3997 		ret = NFS_ATTR_FATTR_RDEV;
3998 	}
3999 	dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
4000 	return ret;
4001 }
4002 
4003 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4004 {
4005 	__be32 *p;
4006 	int status = 0;
4007 
4008 	*res = 0;
4009 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
4010 		return -EIO;
4011 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
4012 		p = xdr_inline_decode(xdr, 8);
4013 		if (unlikely(!p))
4014 			return -EIO;
4015 		xdr_decode_hyper(p, res);
4016 		bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
4017 	}
4018 	dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
4019 	return status;
4020 }
4021 
4022 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4023 {
4024 	__be32 *p;
4025 	int status = 0;
4026 
4027 	*res = 0;
4028 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
4029 		return -EIO;
4030 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
4031 		p = xdr_inline_decode(xdr, 8);
4032 		if (unlikely(!p))
4033 			return -EIO;
4034 		xdr_decode_hyper(p, res);
4035 		bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
4036 	}
4037 	dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
4038 	return status;
4039 }
4040 
4041 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4042 {
4043 	__be32 *p;
4044 	int status = 0;
4045 
4046 	*res = 0;
4047 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4048 		return -EIO;
4049 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4050 		p = xdr_inline_decode(xdr, 8);
4051 		if (unlikely(!p))
4052 			return -EIO;
4053 		xdr_decode_hyper(p, res);
4054 		bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4055 	}
4056 	dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4057 	return status;
4058 }
4059 
4060 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4061 {
4062 	__be32 *p;
4063 	int ret = 0;
4064 
4065 	*used = 0;
4066 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4067 		return -EIO;
4068 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4069 		p = xdr_inline_decode(xdr, 8);
4070 		if (unlikely(!p))
4071 			return -EIO;
4072 		xdr_decode_hyper(p, used);
4073 		bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4074 		ret = NFS_ATTR_FATTR_SPACE_USED;
4075 	}
4076 	dprintk("%s: space used=%Lu\n", __func__,
4077 			(unsigned long long)*used);
4078 	return ret;
4079 }
4080 
4081 static __be32 *
4082 xdr_decode_nfstime4(__be32 *p, struct timespec64 *t)
4083 {
4084 	__u64 sec;
4085 
4086 	p = xdr_decode_hyper(p, &sec);
4087 	t-> tv_sec = sec;
4088 	t->tv_nsec = be32_to_cpup(p++);
4089 	return p;
4090 }
4091 
4092 static int decode_attr_time(struct xdr_stream *xdr, struct timespec64 *time)
4093 {
4094 	__be32 *p;
4095 
4096 	p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
4097 	if (unlikely(!p))
4098 		return -EIO;
4099 	xdr_decode_nfstime4(p, time);
4100 	return 0;
4101 }
4102 
4103 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
4104 {
4105 	int status = 0;
4106 
4107 	time->tv_sec = 0;
4108 	time->tv_nsec = 0;
4109 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4110 		return -EIO;
4111 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4112 		status = decode_attr_time(xdr, time);
4113 		if (status == 0)
4114 			status = NFS_ATTR_FATTR_ATIME;
4115 		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4116 	}
4117 	dprintk("%s: atime=%lld\n", __func__, time->tv_sec);
4118 	return status;
4119 }
4120 
4121 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
4122 {
4123 	int status = 0;
4124 
4125 	time->tv_sec = 0;
4126 	time->tv_nsec = 0;
4127 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4128 		return -EIO;
4129 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4130 		status = decode_attr_time(xdr, time);
4131 		if (status == 0)
4132 			status = NFS_ATTR_FATTR_CTIME;
4133 		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4134 	}
4135 	dprintk("%s: ctime=%lld\n", __func__, time->tv_sec);
4136 	return status;
4137 }
4138 
4139 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4140 				  struct timespec64 *time)
4141 {
4142 	int status = 0;
4143 
4144 	time->tv_sec = 0;
4145 	time->tv_nsec = 0;
4146 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4147 		return -EIO;
4148 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4149 		status = decode_attr_time(xdr, time);
4150 		bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4151 	}
4152 	dprintk("%s: time_delta=%lld %ld\n", __func__, time->tv_sec,
4153 		time->tv_nsec);
4154 	return status;
4155 }
4156 
4157 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4158 					struct nfs4_label *label)
4159 {
4160 	uint32_t pi = 0;
4161 	uint32_t lfs = 0;
4162 	__u32 len;
4163 	__be32 *p;
4164 	int status = 0;
4165 
4166 	if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4167 		return -EIO;
4168 	if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4169 		p = xdr_inline_decode(xdr, 4);
4170 		if (unlikely(!p))
4171 			return -EIO;
4172 		lfs = be32_to_cpup(p++);
4173 		p = xdr_inline_decode(xdr, 4);
4174 		if (unlikely(!p))
4175 			return -EIO;
4176 		pi = be32_to_cpup(p++);
4177 		p = xdr_inline_decode(xdr, 4);
4178 		if (unlikely(!p))
4179 			return -EIO;
4180 		len = be32_to_cpup(p++);
4181 		p = xdr_inline_decode(xdr, len);
4182 		if (unlikely(!p))
4183 			return -EIO;
4184 		if (len < NFS4_MAXLABELLEN) {
4185 			if (label) {
4186 				if (label->len) {
4187 					if (label->len < len)
4188 						return -ERANGE;
4189 					memcpy(label->label, p, len);
4190 				}
4191 				label->len = len;
4192 				label->pi = pi;
4193 				label->lfs = lfs;
4194 				status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4195 			}
4196 			bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4197 		} else
4198 			printk(KERN_WARNING "%s: label too long (%u)!\n",
4199 					__func__, len);
4200 	}
4201 	if (label && label->label)
4202 		dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4203 			(char *)label->label, label->len, label->pi, label->lfs);
4204 	return status;
4205 }
4206 
4207 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec64 *time)
4208 {
4209 	int status = 0;
4210 
4211 	time->tv_sec = 0;
4212 	time->tv_nsec = 0;
4213 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4214 		return -EIO;
4215 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4216 		status = decode_attr_time(xdr, time);
4217 		if (status == 0)
4218 			status = NFS_ATTR_FATTR_MTIME;
4219 		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4220 	}
4221 	dprintk("%s: mtime=%lld\n", __func__, time->tv_sec);
4222 	return status;
4223 }
4224 
4225 static int decode_attr_xattrsupport(struct xdr_stream *xdr, uint32_t *bitmap,
4226 				    uint32_t *res)
4227 {
4228 	__be32 *p;
4229 
4230 	*res = 0;
4231 	if (unlikely(bitmap[2] & (FATTR4_WORD2_XATTR_SUPPORT - 1U)))
4232 		return -EIO;
4233 	if (likely(bitmap[2] & FATTR4_WORD2_XATTR_SUPPORT)) {
4234 		p = xdr_inline_decode(xdr, 4);
4235 		if (unlikely(!p))
4236 			return -EIO;
4237 		*res = be32_to_cpup(p);
4238 		bitmap[2] &= ~FATTR4_WORD2_XATTR_SUPPORT;
4239 	}
4240 	dprintk("%s: XATTR support=%s\n", __func__,
4241 		*res == 0 ? "false" : "true");
4242 	return 0;
4243 }
4244 
4245 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4246 {
4247 	unsigned int attrwords = XDR_QUADLEN(attrlen);
4248 	unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4249 
4250 	if (unlikely(attrwords != nwords)) {
4251 		dprintk("%s: server returned incorrect attribute length: "
4252 			"%u %c %u\n",
4253 				__func__,
4254 				attrwords << 2,
4255 				(attrwords < nwords) ? '<' : '>',
4256 				nwords << 2);
4257 		return -EIO;
4258 	}
4259 	return 0;
4260 }
4261 
4262 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4263 {
4264 	__be32 *p;
4265 
4266 	p = xdr_inline_decode(xdr, 20);
4267 	if (unlikely(!p))
4268 		return -EIO;
4269 	cinfo->atomic = be32_to_cpup(p++);
4270 	p = xdr_decode_hyper(p, &cinfo->before);
4271 	xdr_decode_hyper(p, &cinfo->after);
4272 	return 0;
4273 }
4274 
4275 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4276 {
4277 	__be32 *p;
4278 	uint32_t supp, acc;
4279 	int status;
4280 
4281 	status = decode_op_hdr(xdr, OP_ACCESS);
4282 	if (status)
4283 		return status;
4284 	p = xdr_inline_decode(xdr, 8);
4285 	if (unlikely(!p))
4286 		return -EIO;
4287 	supp = be32_to_cpup(p++);
4288 	acc = be32_to_cpup(p);
4289 	*supported = supp;
4290 	*access = acc;
4291 	return 0;
4292 }
4293 
4294 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4295 {
4296 	ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
4297 	if (unlikely(ret < 0))
4298 		return -EIO;
4299 	return 0;
4300 }
4301 
4302 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4303 {
4304 	return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4305 }
4306 
4307 static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4308 {
4309 	stateid->type = NFS4_OPEN_STATEID_TYPE;
4310 	return decode_stateid(xdr, stateid);
4311 }
4312 
4313 static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4314 {
4315 	stateid->type = NFS4_LOCK_STATEID_TYPE;
4316 	return decode_stateid(xdr, stateid);
4317 }
4318 
4319 static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4320 {
4321 	stateid->type = NFS4_DELEGATION_STATEID_TYPE;
4322 	return decode_stateid(xdr, stateid);
4323 }
4324 
4325 static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4326 {
4327 	nfs4_stateid dummy;
4328 
4329 	nfs4_stateid_copy(stateid, &invalid_stateid);
4330 	return decode_stateid(xdr, &dummy);
4331 }
4332 
4333 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4334 {
4335 	int status;
4336 
4337 	status = decode_op_hdr(xdr, OP_CLOSE);
4338 	if (status != -EIO)
4339 		nfs_increment_open_seqid(status, res->seqid);
4340 	if (!status)
4341 		status = decode_invalid_stateid(xdr, &res->stateid);
4342 	return status;
4343 }
4344 
4345 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4346 {
4347 	return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4348 }
4349 
4350 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4351 {
4352 	return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4353 }
4354 
4355 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4356 {
4357 	struct nfs_writeverf *verf = res->verf;
4358 	int status;
4359 
4360 	status = decode_op_hdr(xdr, OP_COMMIT);
4361 	if (!status)
4362 		status = decode_write_verifier(xdr, &verf->verifier);
4363 	if (!status)
4364 		verf->committed = NFS_FILE_SYNC;
4365 	return status;
4366 }
4367 
4368 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4369 {
4370 	__be32 *p;
4371 	uint32_t bmlen;
4372 	int status;
4373 
4374 	status = decode_op_hdr(xdr, OP_CREATE);
4375 	if (status)
4376 		return status;
4377 	if ((status = decode_change_info(xdr, cinfo)))
4378 		return status;
4379 	p = xdr_inline_decode(xdr, 4);
4380 	if (unlikely(!p))
4381 		return -EIO;
4382 	bmlen = be32_to_cpup(p);
4383 	p = xdr_inline_decode(xdr, bmlen << 2);
4384 	if (likely(p))
4385 		return 0;
4386 	return -EIO;
4387 }
4388 
4389 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4390 {
4391 	unsigned int savep;
4392 	uint32_t attrlen, bitmap[3] = {0};
4393 	int status;
4394 
4395 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4396 		goto xdr_error;
4397 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4398 		goto xdr_error;
4399 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4400 		goto xdr_error;
4401 	if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4402 		goto xdr_error;
4403 	if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4404 						 &res->fh_expire_type)) != 0)
4405 		goto xdr_error;
4406 	if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4407 		goto xdr_error;
4408 	if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4409 		goto xdr_error;
4410 	if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4411 		goto xdr_error;
4412 	if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
4413 				res->exclcreat_bitmask)) != 0)
4414 		goto xdr_error;
4415 	status = verify_attr_len(xdr, savep, attrlen);
4416 xdr_error:
4417 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4418 	return status;
4419 }
4420 
4421 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4422 {
4423 	unsigned int savep;
4424 	uint32_t attrlen, bitmap[3] = {0};
4425 	int status;
4426 
4427 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4428 		goto xdr_error;
4429 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4430 		goto xdr_error;
4431 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4432 		goto xdr_error;
4433 
4434 	if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4435 		goto xdr_error;
4436 	if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4437 		goto xdr_error;
4438 	if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4439 		goto xdr_error;
4440 
4441 	status = -EIO;
4442 	if (unlikely(bitmap[0]))
4443 		goto xdr_error;
4444 
4445 	if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4446 		goto xdr_error;
4447 	if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4448 		goto xdr_error;
4449 	if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4450 		goto xdr_error;
4451 
4452 	status = verify_attr_len(xdr, savep, attrlen);
4453 xdr_error:
4454 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4455 	return status;
4456 }
4457 
4458 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4459 {
4460 	unsigned int savep;
4461 	uint32_t attrlen, bitmap[3] = {0};
4462 	int status;
4463 
4464 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4465 		goto xdr_error;
4466 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4467 		goto xdr_error;
4468 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4469 		goto xdr_error;
4470 
4471 	if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4472 		goto xdr_error;
4473 	if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4474 		goto xdr_error;
4475 
4476 	status = verify_attr_len(xdr, savep, attrlen);
4477 xdr_error:
4478 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4479 	return status;
4480 }
4481 
4482 static int decode_threshold_hint(struct xdr_stream *xdr,
4483 				  uint32_t *bitmap,
4484 				  uint64_t *res,
4485 				  uint32_t hint_bit)
4486 {
4487 	__be32 *p;
4488 
4489 	*res = 0;
4490 	if (likely(bitmap[0] & hint_bit)) {
4491 		p = xdr_inline_decode(xdr, 8);
4492 		if (unlikely(!p))
4493 			return -EIO;
4494 		xdr_decode_hyper(p, res);
4495 	}
4496 	return 0;
4497 }
4498 
4499 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4500 					struct nfs4_threshold *res)
4501 {
4502 	__be32 *p;
4503 	unsigned int savep;
4504 	uint32_t bitmap[3] = {0,}, attrlen;
4505 	int status;
4506 
4507 	/* layout type */
4508 	p = xdr_inline_decode(xdr, 4);
4509 	if (unlikely(!p))
4510 		return -EIO;
4511 	res->l_type = be32_to_cpup(p);
4512 
4513 	/* thi_hintset bitmap */
4514 	status = decode_attr_bitmap(xdr, bitmap);
4515 	if (status < 0)
4516 		goto xdr_error;
4517 
4518 	/* thi_hintlist length */
4519 	status = decode_attr_length(xdr, &attrlen, &savep);
4520 	if (status < 0)
4521 		goto xdr_error;
4522 	/* thi_hintlist */
4523 	status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4524 	if (status < 0)
4525 		goto xdr_error;
4526 	status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4527 	if (status < 0)
4528 		goto xdr_error;
4529 	status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4530 				       THRESHOLD_RD_IO);
4531 	if (status < 0)
4532 		goto xdr_error;
4533 	status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4534 				       THRESHOLD_WR_IO);
4535 	if (status < 0)
4536 		goto xdr_error;
4537 
4538 	status = verify_attr_len(xdr, savep, attrlen);
4539 	res->bm = bitmap[0];
4540 
4541 	dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4542 		 __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4543 		res->wr_io_sz);
4544 xdr_error:
4545 	dprintk("%s ret=%d!\n", __func__, status);
4546 	return status;
4547 }
4548 
4549 /*
4550  * Thresholds on pNFS direct I/O vrs MDS I/O
4551  */
4552 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4553 				    uint32_t *bitmap,
4554 				    struct nfs4_threshold *res)
4555 {
4556 	__be32 *p;
4557 	int status = 0;
4558 	uint32_t num;
4559 
4560 	if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4561 		return -EIO;
4562 	if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4563 		/* Did the server return an unrequested attribute? */
4564 		if (unlikely(res == NULL))
4565 			return -EREMOTEIO;
4566 		p = xdr_inline_decode(xdr, 4);
4567 		if (unlikely(!p))
4568 			return -EIO;
4569 		num = be32_to_cpup(p);
4570 		if (num == 0)
4571 			return 0;
4572 		if (num > 1)
4573 			printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4574 				"drivers per filesystem not supported\n",
4575 				__func__);
4576 
4577 		status = decode_first_threshold_item4(xdr, res);
4578 		bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4579 	}
4580 	return status;
4581 }
4582 
4583 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4584 		struct nfs_fattr *fattr, struct nfs_fh *fh,
4585 		struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4586 		const struct nfs_server *server)
4587 {
4588 	int status;
4589 	umode_t fmode = 0;
4590 	uint32_t type;
4591 	int32_t err;
4592 
4593 	status = decode_attr_type(xdr, bitmap, &type);
4594 	if (status < 0)
4595 		goto xdr_error;
4596 	fattr->mode = 0;
4597 	if (status != 0) {
4598 		fattr->mode |= nfs_type2fmt[type];
4599 		fattr->valid |= status;
4600 	}
4601 
4602 	status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4603 	if (status < 0)
4604 		goto xdr_error;
4605 	fattr->valid |= status;
4606 
4607 	status = decode_attr_size(xdr, bitmap, &fattr->size);
4608 	if (status < 0)
4609 		goto xdr_error;
4610 	fattr->valid |= status;
4611 
4612 	status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4613 	if (status < 0)
4614 		goto xdr_error;
4615 	fattr->valid |= status;
4616 
4617 	err = 0;
4618 	status = decode_attr_error(xdr, bitmap, &err);
4619 	if (status < 0)
4620 		goto xdr_error;
4621 
4622 	status = decode_attr_filehandle(xdr, bitmap, fh);
4623 	if (status < 0)
4624 		goto xdr_error;
4625 
4626 	status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4627 	if (status < 0)
4628 		goto xdr_error;
4629 	fattr->valid |= status;
4630 
4631 	status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4632 	if (status < 0)
4633 		goto xdr_error;
4634 	fattr->valid |= status;
4635 
4636 	status = -EIO;
4637 	if (unlikely(bitmap[0]))
4638 		goto xdr_error;
4639 
4640 	status = decode_attr_mode(xdr, bitmap, &fmode);
4641 	if (status < 0)
4642 		goto xdr_error;
4643 	if (status != 0) {
4644 		fattr->mode |= fmode;
4645 		fattr->valid |= status;
4646 	}
4647 
4648 	status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4649 	if (status < 0)
4650 		goto xdr_error;
4651 	fattr->valid |= status;
4652 
4653 	status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4654 	if (status < 0)
4655 		goto xdr_error;
4656 	fattr->valid |= status;
4657 
4658 	status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4659 	if (status < 0)
4660 		goto xdr_error;
4661 	fattr->valid |= status;
4662 
4663 	status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4664 	if (status < 0)
4665 		goto xdr_error;
4666 	fattr->valid |= status;
4667 
4668 	status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4669 	if (status < 0)
4670 		goto xdr_error;
4671 	fattr->valid |= status;
4672 
4673 	status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4674 	if (status < 0)
4675 		goto xdr_error;
4676 	fattr->valid |= status;
4677 
4678 	status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4679 	if (status < 0)
4680 		goto xdr_error;
4681 	fattr->valid |= status;
4682 
4683 	status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4684 	if (status < 0)
4685 		goto xdr_error;
4686 	fattr->valid |= status;
4687 
4688 	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4689 	if (status < 0)
4690 		goto xdr_error;
4691 	fattr->valid |= status;
4692 
4693 	status = -EIO;
4694 	if (unlikely(bitmap[1]))
4695 		goto xdr_error;
4696 
4697 	status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4698 	if (status < 0)
4699 		goto xdr_error;
4700 
4701 	if (label) {
4702 		status = decode_attr_security_label(xdr, bitmap, label);
4703 		if (status < 0)
4704 			goto xdr_error;
4705 		fattr->valid |= status;
4706 	}
4707 
4708 xdr_error:
4709 	dprintk("%s: xdr returned %d\n", __func__, -status);
4710 	return status;
4711 }
4712 
4713 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4714 		struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4715 		struct nfs4_label *label, const struct nfs_server *server)
4716 {
4717 	unsigned int savep;
4718 	uint32_t attrlen,
4719 		 bitmap[3] = {0};
4720 	int status;
4721 
4722 	status = decode_op_hdr(xdr, OP_GETATTR);
4723 	if (status < 0)
4724 		goto xdr_error;
4725 
4726 	status = decode_attr_bitmap(xdr, bitmap);
4727 	if (status < 0)
4728 		goto xdr_error;
4729 
4730 	status = decode_attr_length(xdr, &attrlen, &savep);
4731 	if (status < 0)
4732 		goto xdr_error;
4733 
4734 	status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4735 					label, server);
4736 	if (status < 0)
4737 		goto xdr_error;
4738 
4739 	status = verify_attr_len(xdr, savep, attrlen);
4740 xdr_error:
4741 	dprintk("%s: xdr returned %d\n", __func__, -status);
4742 	return status;
4743 }
4744 
4745 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4746 		struct nfs4_label *label, const struct nfs_server *server)
4747 {
4748 	return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4749 }
4750 
4751 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4752 		const struct nfs_server *server)
4753 {
4754 	return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4755 }
4756 
4757 /*
4758  * Decode potentially multiple layout types.
4759  */
4760 static int decode_pnfs_layout_types(struct xdr_stream *xdr,
4761 				    struct nfs_fsinfo *fsinfo)
4762 {
4763 	__be32 *p;
4764 	uint32_t i;
4765 
4766 	p = xdr_inline_decode(xdr, 4);
4767 	if (unlikely(!p))
4768 		return -EIO;
4769 	fsinfo->nlayouttypes = be32_to_cpup(p);
4770 
4771 	/* pNFS is not supported by the underlying file system */
4772 	if (fsinfo->nlayouttypes == 0)
4773 		return 0;
4774 
4775 	/* Decode and set first layout type, move xdr->p past unused types */
4776 	p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
4777 	if (unlikely(!p))
4778 		return -EIO;
4779 
4780 	/* If we get too many, then just cap it at the max */
4781 	if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
4782 		printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
4783 			__func__, fsinfo->nlayouttypes);
4784 		fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
4785 	}
4786 
4787 	for(i = 0; i < fsinfo->nlayouttypes; ++i)
4788 		fsinfo->layouttype[i] = be32_to_cpup(p++);
4789 	return 0;
4790 }
4791 
4792 /*
4793  * The type of file system exported.
4794  * Note we must ensure that layouttype is set in any non-error case.
4795  */
4796 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4797 				struct nfs_fsinfo *fsinfo)
4798 {
4799 	int status = 0;
4800 
4801 	dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4802 	if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4803 		return -EIO;
4804 	if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4805 		status = decode_pnfs_layout_types(xdr, fsinfo);
4806 		bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4807 	}
4808 	return status;
4809 }
4810 
4811 /*
4812  * The prefered block size for layout directed io
4813  */
4814 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4815 				      uint32_t *res)
4816 {
4817 	__be32 *p;
4818 
4819 	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4820 	*res = 0;
4821 	if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4822 		p = xdr_inline_decode(xdr, 4);
4823 		if (unlikely(!p))
4824 			return -EIO;
4825 		*res = be32_to_cpup(p);
4826 		bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4827 	}
4828 	return 0;
4829 }
4830 
4831 /*
4832  * The granularity of a CLONE operation.
4833  */
4834 static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4835 				     uint32_t *res)
4836 {
4837 	__be32 *p;
4838 
4839 	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4840 	*res = 0;
4841 	if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
4842 		p = xdr_inline_decode(xdr, 4);
4843 		if (unlikely(!p))
4844 			return -EIO;
4845 		*res = be32_to_cpup(p);
4846 		bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
4847 	}
4848 	return 0;
4849 }
4850 
4851 static int decode_attr_change_attr_type(struct xdr_stream *xdr,
4852 					uint32_t *bitmap,
4853 					enum nfs4_change_attr_type *res)
4854 {
4855 	u32 tmp = NFS4_CHANGE_TYPE_IS_UNDEFINED;
4856 
4857 	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4858 	if (bitmap[2] & FATTR4_WORD2_CHANGE_ATTR_TYPE) {
4859 		if (xdr_stream_decode_u32(xdr, &tmp))
4860 			return -EIO;
4861 		bitmap[2] &= ~FATTR4_WORD2_CHANGE_ATTR_TYPE;
4862 	}
4863 
4864 	switch(tmp) {
4865 	case NFS4_CHANGE_TYPE_IS_MONOTONIC_INCR:
4866 	case NFS4_CHANGE_TYPE_IS_VERSION_COUNTER:
4867 	case NFS4_CHANGE_TYPE_IS_VERSION_COUNTER_NOPNFS:
4868 	case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
4869 		*res = tmp;
4870 		break;
4871 	default:
4872 		*res = NFS4_CHANGE_TYPE_IS_UNDEFINED;
4873 	}
4874 	return 0;
4875 }
4876 
4877 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4878 {
4879 	unsigned int savep;
4880 	uint32_t attrlen, bitmap[3];
4881 	int status;
4882 
4883 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4884 		goto xdr_error;
4885 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4886 		goto xdr_error;
4887 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4888 		goto xdr_error;
4889 
4890 	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */
4891 
4892 	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4893 		goto xdr_error;
4894 	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4895 		goto xdr_error;
4896 	if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4897 		goto xdr_error;
4898 	fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4899 	if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4900 		goto xdr_error;
4901 	fsinfo->wtpref = fsinfo->wtmax;
4902 
4903 	status = -EIO;
4904 	if (unlikely(bitmap[0]))
4905 		goto xdr_error;
4906 
4907 	status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4908 	if (status != 0)
4909 		goto xdr_error;
4910 	status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
4911 	if (status != 0)
4912 		goto xdr_error;
4913 
4914 	status = -EIO;
4915 	if (unlikely(bitmap[1]))
4916 		goto xdr_error;
4917 
4918 	status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4919 	if (status)
4920 		goto xdr_error;
4921 	status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
4922 	if (status)
4923 		goto xdr_error;
4924 
4925 	status = decode_attr_change_attr_type(xdr, bitmap,
4926 					      &fsinfo->change_attr_type);
4927 	if (status)
4928 		goto xdr_error;
4929 
4930 	status = decode_attr_xattrsupport(xdr, bitmap,
4931 					  &fsinfo->xattr_support);
4932 	if (status)
4933 		goto xdr_error;
4934 
4935 	status = verify_attr_len(xdr, savep, attrlen);
4936 xdr_error:
4937 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4938 	return status;
4939 }
4940 
4941 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4942 {
4943 	__be32 *p;
4944 	uint32_t len;
4945 	int status;
4946 
4947 	/* Zero handle first to allow comparisons */
4948 	memset(fh, 0, sizeof(*fh));
4949 
4950 	status = decode_op_hdr(xdr, OP_GETFH);
4951 	if (status)
4952 		return status;
4953 
4954 	p = xdr_inline_decode(xdr, 4);
4955 	if (unlikely(!p))
4956 		return -EIO;
4957 	len = be32_to_cpup(p);
4958 	if (len > NFS4_FHSIZE || len == 0) {
4959 		trace_nfs4_xdr_bad_filehandle(xdr, OP_GETFH, NFS4ERR_BADHANDLE);
4960 		return -EREMOTEIO;
4961 	}
4962 	fh->size = len;
4963 	p = xdr_inline_decode(xdr, len);
4964 	if (unlikely(!p))
4965 		return -EIO;
4966 	memcpy(fh->data, p, len);
4967 	return 0;
4968 }
4969 
4970 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4971 {
4972 	int status;
4973 
4974 	status = decode_op_hdr(xdr, OP_LINK);
4975 	if (status)
4976 		return status;
4977 	return decode_change_info(xdr, cinfo);
4978 }
4979 
4980 /*
4981  * We create the owner, so we know a proper owner.id length is 4.
4982  */
4983 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4984 {
4985 	uint64_t offset, length, clientid;
4986 	__be32 *p;
4987 	uint32_t namelen, type;
4988 
4989 	p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4990 	if (unlikely(!p))
4991 		return -EIO;
4992 	p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4993 	p = xdr_decode_hyper(p, &length);
4994 	type = be32_to_cpup(p++); /* 4 byte read */
4995 	if (fl != NULL) { /* manipulate file lock */
4996 		fl->fl_start = (loff_t)offset;
4997 		fl->fl_end = fl->fl_start + (loff_t)length - 1;
4998 		if (length == ~(uint64_t)0)
4999 			fl->fl_end = OFFSET_MAX;
5000 		fl->fl_type = F_WRLCK;
5001 		if (type & 1)
5002 			fl->fl_type = F_RDLCK;
5003 		fl->fl_pid = 0;
5004 	}
5005 	p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
5006 	namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
5007 	p = xdr_inline_decode(xdr, namelen); /* variable size field */
5008 	if (likely(!p))
5009 		return -EIO;
5010 	return -NFS4ERR_DENIED;
5011 }
5012 
5013 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
5014 {
5015 	int status;
5016 
5017 	status = decode_op_hdr(xdr, OP_LOCK);
5018 	if (status == -EIO)
5019 		goto out;
5020 	if (status == 0) {
5021 		status = decode_lock_stateid(xdr, &res->stateid);
5022 		if (unlikely(status))
5023 			goto out;
5024 	} else if (status == -NFS4ERR_DENIED)
5025 		status = decode_lock_denied(xdr, NULL);
5026 	if (res->open_seqid != NULL)
5027 		nfs_increment_open_seqid(status, res->open_seqid);
5028 	nfs_increment_lock_seqid(status, res->lock_seqid);
5029 out:
5030 	return status;
5031 }
5032 
5033 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
5034 {
5035 	int status;
5036 	status = decode_op_hdr(xdr, OP_LOCKT);
5037 	if (status == -NFS4ERR_DENIED)
5038 		return decode_lock_denied(xdr, res->denied);
5039 	return status;
5040 }
5041 
5042 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
5043 {
5044 	int status;
5045 
5046 	status = decode_op_hdr(xdr, OP_LOCKU);
5047 	if (status != -EIO)
5048 		nfs_increment_lock_seqid(status, res->seqid);
5049 	if (status == 0)
5050 		status = decode_lock_stateid(xdr, &res->stateid);
5051 	return status;
5052 }
5053 
5054 static int decode_release_lockowner(struct xdr_stream *xdr)
5055 {
5056 	return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
5057 }
5058 
5059 static int decode_lookup(struct xdr_stream *xdr)
5060 {
5061 	return decode_op_hdr(xdr, OP_LOOKUP);
5062 }
5063 
5064 static int decode_lookupp(struct xdr_stream *xdr)
5065 {
5066 	return decode_op_hdr(xdr, OP_LOOKUPP);
5067 }
5068 
5069 /* This is too sick! */
5070 static int decode_space_limit(struct xdr_stream *xdr,
5071 		unsigned long *pagemod_limit)
5072 {
5073 	__be32 *p;
5074 	uint32_t limit_type, nblocks, blocksize;
5075 	u64 maxsize = 0;
5076 
5077 	p = xdr_inline_decode(xdr, 12);
5078 	if (unlikely(!p))
5079 		return -EIO;
5080 	limit_type = be32_to_cpup(p++);
5081 	switch (limit_type) {
5082 	case NFS4_LIMIT_SIZE:
5083 		xdr_decode_hyper(p, &maxsize);
5084 		break;
5085 	case NFS4_LIMIT_BLOCKS:
5086 		nblocks = be32_to_cpup(p++);
5087 		blocksize = be32_to_cpup(p);
5088 		maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
5089 	}
5090 	maxsize >>= PAGE_SHIFT;
5091 	*pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
5092 	return 0;
5093 }
5094 
5095 static int decode_rw_delegation(struct xdr_stream *xdr,
5096 		uint32_t delegation_type,
5097 		struct nfs_openres *res)
5098 {
5099 	__be32 *p;
5100 	int status;
5101 
5102 	status = decode_delegation_stateid(xdr, &res->delegation);
5103 	if (unlikely(status))
5104 		return status;
5105 	p = xdr_inline_decode(xdr, 4);
5106 	if (unlikely(!p))
5107 		return -EIO;
5108 	res->do_recall = be32_to_cpup(p);
5109 
5110 	switch (delegation_type) {
5111 	case NFS4_OPEN_DELEGATE_READ:
5112 		res->delegation_type = FMODE_READ;
5113 		break;
5114 	case NFS4_OPEN_DELEGATE_WRITE:
5115 		res->delegation_type = FMODE_WRITE|FMODE_READ;
5116 		if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
5117 				return -EIO;
5118 	}
5119 	return decode_ace(xdr, NULL);
5120 }
5121 
5122 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5123 {
5124 	__be32 *p;
5125 	uint32_t why_no_delegation;
5126 
5127 	p = xdr_inline_decode(xdr, 4);
5128 	if (unlikely(!p))
5129 		return -EIO;
5130 	why_no_delegation = be32_to_cpup(p);
5131 	switch (why_no_delegation) {
5132 		case WND4_CONTENTION:
5133 		case WND4_RESOURCE:
5134 			xdr_inline_decode(xdr, 4);
5135 			/* Ignore for now */
5136 	}
5137 	return 0;
5138 }
5139 
5140 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5141 {
5142 	__be32 *p;
5143 	uint32_t delegation_type;
5144 
5145 	p = xdr_inline_decode(xdr, 4);
5146 	if (unlikely(!p))
5147 		return -EIO;
5148 	delegation_type = be32_to_cpup(p);
5149 	res->delegation_type = 0;
5150 	switch (delegation_type) {
5151 	case NFS4_OPEN_DELEGATE_NONE:
5152 		return 0;
5153 	case NFS4_OPEN_DELEGATE_READ:
5154 	case NFS4_OPEN_DELEGATE_WRITE:
5155 		return decode_rw_delegation(xdr, delegation_type, res);
5156 	case NFS4_OPEN_DELEGATE_NONE_EXT:
5157 		return decode_no_delegation(xdr, res);
5158 	}
5159 	return -EIO;
5160 }
5161 
5162 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5163 {
5164 	__be32 *p;
5165 	uint32_t savewords, bmlen, i;
5166 	int status;
5167 
5168 	if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5169 		return status;
5170 	nfs_increment_open_seqid(status, res->seqid);
5171 	if (status)
5172 		return status;
5173 	status = decode_open_stateid(xdr, &res->stateid);
5174 	if (unlikely(status))
5175 		return status;
5176 
5177 	decode_change_info(xdr, &res->cinfo);
5178 
5179 	p = xdr_inline_decode(xdr, 8);
5180 	if (unlikely(!p))
5181 		return -EIO;
5182 	res->rflags = be32_to_cpup(p++);
5183 	bmlen = be32_to_cpup(p);
5184 	if (bmlen > 10)
5185 		goto xdr_error;
5186 
5187 	p = xdr_inline_decode(xdr, bmlen << 2);
5188 	if (unlikely(!p))
5189 		return -EIO;
5190 	savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5191 	for (i = 0; i < savewords; ++i)
5192 		res->attrset[i] = be32_to_cpup(p++);
5193 	for (; i < NFS4_BITMAP_SIZE; i++)
5194 		res->attrset[i] = 0;
5195 
5196 	return decode_delegation(xdr, res);
5197 xdr_error:
5198 	dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5199 	return -EIO;
5200 }
5201 
5202 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5203 {
5204 	int status;
5205 
5206 	status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5207 	if (status != -EIO)
5208 		nfs_increment_open_seqid(status, res->seqid);
5209 	if (!status)
5210 		status = decode_open_stateid(xdr, &res->stateid);
5211 	return status;
5212 }
5213 
5214 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5215 {
5216 	int status;
5217 
5218 	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5219 	if (status != -EIO)
5220 		nfs_increment_open_seqid(status, res->seqid);
5221 	if (!status)
5222 		status = decode_open_stateid(xdr, &res->stateid);
5223 	return status;
5224 }
5225 
5226 static int decode_putfh(struct xdr_stream *xdr)
5227 {
5228 	return decode_op_hdr(xdr, OP_PUTFH);
5229 }
5230 
5231 static int decode_putrootfh(struct xdr_stream *xdr)
5232 {
5233 	return decode_op_hdr(xdr, OP_PUTROOTFH);
5234 }
5235 
5236 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5237 		       struct nfs_pgio_res *res)
5238 {
5239 	__be32 *p;
5240 	uint32_t count, eof, recvd;
5241 	int status;
5242 
5243 	status = decode_op_hdr(xdr, OP_READ);
5244 	if (status)
5245 		return status;
5246 	p = xdr_inline_decode(xdr, 8);
5247 	if (unlikely(!p))
5248 		return -EIO;
5249 	eof = be32_to_cpup(p++);
5250 	count = be32_to_cpup(p);
5251 	recvd = xdr_read_pages(xdr, count);
5252 	if (count > recvd) {
5253 		dprintk("NFS: server cheating in read reply: "
5254 				"count %u > recvd %u\n", count, recvd);
5255 		count = recvd;
5256 		eof = 0;
5257 	}
5258 	res->eof = eof;
5259 	res->count = count;
5260 	return 0;
5261 }
5262 
5263 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5264 {
5265 	int		status;
5266 	__be32		verf[2];
5267 
5268 	status = decode_op_hdr(xdr, OP_READDIR);
5269 	if (!status)
5270 		status = decode_verifier(xdr, readdir->verifier.data);
5271 	if (unlikely(status))
5272 		return status;
5273 	memcpy(verf, readdir->verifier.data, sizeof(verf));
5274 	dprintk("%s: verifier = %08x:%08x\n",
5275 			__func__, verf[0], verf[1]);
5276 	return xdr_read_pages(xdr, xdr->buf->page_len);
5277 }
5278 
5279 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5280 {
5281 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5282 	u32 len, recvd;
5283 	__be32 *p;
5284 	int status;
5285 
5286 	status = decode_op_hdr(xdr, OP_READLINK);
5287 	if (status)
5288 		return status;
5289 
5290 	/* Convert length of symlink */
5291 	p = xdr_inline_decode(xdr, 4);
5292 	if (unlikely(!p))
5293 		return -EIO;
5294 	len = be32_to_cpup(p);
5295 	if (len >= rcvbuf->page_len || len <= 0) {
5296 		dprintk("nfs: server returned giant symlink!\n");
5297 		return -ENAMETOOLONG;
5298 	}
5299 	recvd = xdr_read_pages(xdr, len);
5300 	if (recvd < len) {
5301 		dprintk("NFS: server cheating in readlink reply: "
5302 				"count %u > recvd %u\n", len, recvd);
5303 		return -EIO;
5304 	}
5305 	/*
5306 	 * The XDR encode routine has set things up so that
5307 	 * the link text will be copied directly into the
5308 	 * buffer.  We just have to do overflow-checking,
5309 	 * and null-terminate the text (the VFS expects
5310 	 * null-termination).
5311 	 */
5312 	xdr_terminate_string(rcvbuf, len);
5313 	return 0;
5314 }
5315 
5316 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5317 {
5318 	int status;
5319 
5320 	status = decode_op_hdr(xdr, OP_REMOVE);
5321 	if (status)
5322 		goto out;
5323 	status = decode_change_info(xdr, cinfo);
5324 out:
5325 	return status;
5326 }
5327 
5328 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5329 	      struct nfs4_change_info *new_cinfo)
5330 {
5331 	int status;
5332 
5333 	status = decode_op_hdr(xdr, OP_RENAME);
5334 	if (status)
5335 		goto out;
5336 	if ((status = decode_change_info(xdr, old_cinfo)))
5337 		goto out;
5338 	status = decode_change_info(xdr, new_cinfo);
5339 out:
5340 	return status;
5341 }
5342 
5343 static int decode_renew(struct xdr_stream *xdr)
5344 {
5345 	return decode_op_hdr(xdr, OP_RENEW);
5346 }
5347 
5348 static int
5349 decode_restorefh(struct xdr_stream *xdr)
5350 {
5351 	return decode_op_hdr(xdr, OP_RESTOREFH);
5352 }
5353 
5354 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5355 			 struct nfs_getaclres *res)
5356 {
5357 	unsigned int savep;
5358 	uint32_t attrlen,
5359 		 bitmap[3] = {0};
5360 	int status;
5361 
5362 	res->acl_len = 0;
5363 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5364 		goto out;
5365 
5366 	xdr_enter_page(xdr, xdr->buf->page_len);
5367 
5368 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5369 		goto out;
5370 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5371 		goto out;
5372 
5373 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5374 		return -EIO;
5375 	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5376 
5377 		/* The bitmap (xdr len + bitmaps) and the attr xdr len words
5378 		 * are stored with the acl data to handle the problem of
5379 		 * variable length bitmaps.*/
5380 		res->acl_data_offset = xdr_page_pos(xdr);
5381 		res->acl_len = attrlen;
5382 
5383 		/* Check for receive buffer overflow */
5384 		if (res->acl_len > xdr_stream_remaining(xdr) ||
5385 		    res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5386 			res->acl_flags |= NFS4_ACL_TRUNC;
5387 			dprintk("NFS: acl reply: attrlen %u > page_len %zu\n",
5388 				attrlen, xdr_stream_remaining(xdr));
5389 		}
5390 	} else
5391 		status = -EOPNOTSUPP;
5392 
5393 out:
5394 	return status;
5395 }
5396 
5397 static int
5398 decode_savefh(struct xdr_stream *xdr)
5399 {
5400 	return decode_op_hdr(xdr, OP_SAVEFH);
5401 }
5402 
5403 static int decode_setattr(struct xdr_stream *xdr)
5404 {
5405 	int status;
5406 
5407 	status = decode_op_hdr(xdr, OP_SETATTR);
5408 	if (status)
5409 		return status;
5410 	if (decode_bitmap4(xdr, NULL, 0) >= 0)
5411 		return 0;
5412 	return -EIO;
5413 }
5414 
5415 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5416 {
5417 	__be32 *p;
5418 	uint32_t opnum;
5419 	int32_t nfserr;
5420 
5421 	p = xdr_inline_decode(xdr, 8);
5422 	if (unlikely(!p))
5423 		return -EIO;
5424 	opnum = be32_to_cpup(p++);
5425 	if (opnum != OP_SETCLIENTID) {
5426 		dprintk("nfs: decode_setclientid: Server returned operation"
5427 			" %d\n", opnum);
5428 		return -EIO;
5429 	}
5430 	nfserr = be32_to_cpup(p);
5431 	if (nfserr == NFS_OK) {
5432 		p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5433 		if (unlikely(!p))
5434 			return -EIO;
5435 		p = xdr_decode_hyper(p, &res->clientid);
5436 		memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5437 	} else if (nfserr == NFSERR_CLID_INUSE) {
5438 		uint32_t len;
5439 
5440 		/* skip netid string */
5441 		p = xdr_inline_decode(xdr, 4);
5442 		if (unlikely(!p))
5443 			return -EIO;
5444 		len = be32_to_cpup(p);
5445 		p = xdr_inline_decode(xdr, len);
5446 		if (unlikely(!p))
5447 			return -EIO;
5448 
5449 		/* skip uaddr string */
5450 		p = xdr_inline_decode(xdr, 4);
5451 		if (unlikely(!p))
5452 			return -EIO;
5453 		len = be32_to_cpup(p);
5454 		p = xdr_inline_decode(xdr, len);
5455 		if (unlikely(!p))
5456 			return -EIO;
5457 		return -NFSERR_CLID_INUSE;
5458 	} else
5459 		return nfs4_stat_to_errno(nfserr);
5460 
5461 	return 0;
5462 }
5463 
5464 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5465 {
5466 	return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5467 }
5468 
5469 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5470 {
5471 	__be32 *p;
5472 	int status;
5473 
5474 	status = decode_op_hdr(xdr, OP_WRITE);
5475 	if (status)
5476 		return status;
5477 
5478 	p = xdr_inline_decode(xdr, 8);
5479 	if (unlikely(!p))
5480 		return -EIO;
5481 	res->count = be32_to_cpup(p++);
5482 	res->verf->committed = be32_to_cpup(p++);
5483 	return decode_write_verifier(xdr, &res->verf->verifier);
5484 }
5485 
5486 static int decode_delegreturn(struct xdr_stream *xdr)
5487 {
5488 	return decode_op_hdr(xdr, OP_DELEGRETURN);
5489 }
5490 
5491 static int decode_secinfo_gss(struct xdr_stream *xdr,
5492 			      struct nfs4_secinfo4 *flavor)
5493 {
5494 	u32 oid_len;
5495 	__be32 *p;
5496 
5497 	p = xdr_inline_decode(xdr, 4);
5498 	if (unlikely(!p))
5499 		return -EIO;
5500 	oid_len = be32_to_cpup(p);
5501 	if (oid_len > GSS_OID_MAX_LEN)
5502 		return -EINVAL;
5503 
5504 	p = xdr_inline_decode(xdr, oid_len);
5505 	if (unlikely(!p))
5506 		return -EIO;
5507 	memcpy(flavor->flavor_info.oid.data, p, oid_len);
5508 	flavor->flavor_info.oid.len = oid_len;
5509 
5510 	p = xdr_inline_decode(xdr, 8);
5511 	if (unlikely(!p))
5512 		return -EIO;
5513 	flavor->flavor_info.qop = be32_to_cpup(p++);
5514 	flavor->flavor_info.service = be32_to_cpup(p);
5515 
5516 	return 0;
5517 }
5518 
5519 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5520 {
5521 	struct nfs4_secinfo4 *sec_flavor;
5522 	unsigned int i, num_flavors;
5523 	int status;
5524 	__be32 *p;
5525 
5526 	p = xdr_inline_decode(xdr, 4);
5527 	if (unlikely(!p))
5528 		return -EIO;
5529 
5530 	res->flavors->num_flavors = 0;
5531 	num_flavors = be32_to_cpup(p);
5532 
5533 	for (i = 0; i < num_flavors; i++) {
5534 		sec_flavor = &res->flavors->flavors[i];
5535 		if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5536 			break;
5537 
5538 		p = xdr_inline_decode(xdr, 4);
5539 		if (unlikely(!p))
5540 			return -EIO;
5541 		sec_flavor->flavor = be32_to_cpup(p);
5542 
5543 		if (sec_flavor->flavor == RPC_AUTH_GSS) {
5544 			status = decode_secinfo_gss(xdr, sec_flavor);
5545 			if (status)
5546 				goto out;
5547 		}
5548 		res->flavors->num_flavors++;
5549 	}
5550 
5551 	status = 0;
5552 out:
5553 	return status;
5554 }
5555 
5556 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5557 {
5558 	int status = decode_op_hdr(xdr, OP_SECINFO);
5559 	if (status)
5560 		return status;
5561 	return decode_secinfo_common(xdr, res);
5562 }
5563 
5564 #if defined(CONFIG_NFS_V4_1)
5565 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5566 {
5567 	int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5568 	if (status)
5569 		return status;
5570 	return decode_secinfo_common(xdr, res);
5571 }
5572 
5573 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5574 {
5575 	__be32 *p;
5576 	uint32_t bitmap_words;
5577 	unsigned int i;
5578 
5579 	p = xdr_inline_decode(xdr, 4);
5580 	if (!p)
5581 		return -EIO;
5582 	bitmap_words = be32_to_cpup(p++);
5583 	if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5584 		return -EIO;
5585 	p = xdr_inline_decode(xdr, 4 * bitmap_words);
5586 	for (i = 0; i < bitmap_words; i++)
5587 		op_map->u.words[i] = be32_to_cpup(p++);
5588 
5589 	return 0;
5590 }
5591 
5592 static int decode_exchange_id(struct xdr_stream *xdr,
5593 			      struct nfs41_exchange_id_res *res)
5594 {
5595 	__be32 *p;
5596 	uint32_t dummy;
5597 	char *dummy_str;
5598 	int status;
5599 	uint32_t impl_id_count;
5600 
5601 	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5602 	if (status)
5603 		return status;
5604 
5605 	p = xdr_inline_decode(xdr, 8);
5606 	if (unlikely(!p))
5607 		return -EIO;
5608 	xdr_decode_hyper(p, &res->clientid);
5609 	p = xdr_inline_decode(xdr, 12);
5610 	if (unlikely(!p))
5611 		return -EIO;
5612 	res->seqid = be32_to_cpup(p++);
5613 	res->flags = be32_to_cpup(p++);
5614 
5615 	res->state_protect.how = be32_to_cpup(p);
5616 	switch (res->state_protect.how) {
5617 	case SP4_NONE:
5618 		break;
5619 	case SP4_MACH_CRED:
5620 		status = decode_op_map(xdr, &res->state_protect.enforce);
5621 		if (status)
5622 			return status;
5623 		status = decode_op_map(xdr, &res->state_protect.allow);
5624 		if (status)
5625 			return status;
5626 		break;
5627 	default:
5628 		WARN_ON_ONCE(1);
5629 		return -EIO;
5630 	}
5631 
5632 	/* server_owner4.so_minor_id */
5633 	p = xdr_inline_decode(xdr, 8);
5634 	if (unlikely(!p))
5635 		return -EIO;
5636 	p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5637 
5638 	/* server_owner4.so_major_id */
5639 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5640 	if (unlikely(status))
5641 		return status;
5642 	memcpy(res->server_owner->major_id, dummy_str, dummy);
5643 	res->server_owner->major_id_sz = dummy;
5644 
5645 	/* server_scope4 */
5646 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5647 	if (unlikely(status))
5648 		return status;
5649 	memcpy(res->server_scope->server_scope, dummy_str, dummy);
5650 	res->server_scope->server_scope_sz = dummy;
5651 
5652 	/* Implementation Id */
5653 	p = xdr_inline_decode(xdr, 4);
5654 	if (unlikely(!p))
5655 		return -EIO;
5656 	impl_id_count = be32_to_cpup(p++);
5657 
5658 	if (impl_id_count) {
5659 		/* nii_domain */
5660 		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5661 		if (unlikely(status))
5662 			return status;
5663 		memcpy(res->impl_id->domain, dummy_str, dummy);
5664 
5665 		/* nii_name */
5666 		status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5667 		if (unlikely(status))
5668 			return status;
5669 		memcpy(res->impl_id->name, dummy_str, dummy);
5670 
5671 		/* nii_date */
5672 		p = xdr_inline_decode(xdr, 12);
5673 		if (unlikely(!p))
5674 			return -EIO;
5675 		p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5676 		res->impl_id->date.nseconds = be32_to_cpup(p);
5677 
5678 		/* if there's more than one entry, ignore the rest */
5679 	}
5680 	return 0;
5681 }
5682 
5683 static int decode_chan_attrs(struct xdr_stream *xdr,
5684 			     struct nfs4_channel_attrs *attrs)
5685 {
5686 	__be32 *p;
5687 	u32 nr_attrs, val;
5688 
5689 	p = xdr_inline_decode(xdr, 28);
5690 	if (unlikely(!p))
5691 		return -EIO;
5692 	val = be32_to_cpup(p++);	/* headerpadsz */
5693 	if (val)
5694 		return -EINVAL;		/* no support for header padding yet */
5695 	attrs->max_rqst_sz = be32_to_cpup(p++);
5696 	attrs->max_resp_sz = be32_to_cpup(p++);
5697 	attrs->max_resp_sz_cached = be32_to_cpup(p++);
5698 	attrs->max_ops = be32_to_cpup(p++);
5699 	attrs->max_reqs = be32_to_cpup(p++);
5700 	nr_attrs = be32_to_cpup(p);
5701 	if (unlikely(nr_attrs > 1)) {
5702 		printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5703 			"count %u\n", __func__, nr_attrs);
5704 		return -EINVAL;
5705 	}
5706 	if (nr_attrs == 1) {
5707 		p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5708 		if (unlikely(!p))
5709 			return -EIO;
5710 	}
5711 	return 0;
5712 }
5713 
5714 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5715 {
5716 	return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5717 }
5718 
5719 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5720 				struct nfs41_bind_conn_to_session_res *res)
5721 {
5722 	__be32 *p;
5723 	int status;
5724 
5725 	status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5726 	if (!status)
5727 		status = decode_sessionid(xdr, &res->sessionid);
5728 	if (unlikely(status))
5729 		return status;
5730 
5731 	/* dir flags, rdma mode bool */
5732 	p = xdr_inline_decode(xdr, 8);
5733 	if (unlikely(!p))
5734 		return -EIO;
5735 
5736 	res->dir = be32_to_cpup(p++);
5737 	if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5738 		return -EIO;
5739 	if (be32_to_cpup(p) == 0)
5740 		res->use_conn_in_rdma_mode = false;
5741 	else
5742 		res->use_conn_in_rdma_mode = true;
5743 
5744 	return 0;
5745 }
5746 
5747 static int decode_create_session(struct xdr_stream *xdr,
5748 				 struct nfs41_create_session_res *res)
5749 {
5750 	__be32 *p;
5751 	int status;
5752 
5753 	status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5754 	if (!status)
5755 		status = decode_sessionid(xdr, &res->sessionid);
5756 	if (unlikely(status))
5757 		return status;
5758 
5759 	/* seqid, flags */
5760 	p = xdr_inline_decode(xdr, 8);
5761 	if (unlikely(!p))
5762 		return -EIO;
5763 	res->seqid = be32_to_cpup(p++);
5764 	res->flags = be32_to_cpup(p);
5765 
5766 	/* Channel attributes */
5767 	status = decode_chan_attrs(xdr, &res->fc_attrs);
5768 	if (!status)
5769 		status = decode_chan_attrs(xdr, &res->bc_attrs);
5770 	return status;
5771 }
5772 
5773 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5774 {
5775 	return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5776 }
5777 
5778 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5779 {
5780 	return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5781 }
5782 
5783 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5784 {
5785 	return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5786 }
5787 #endif /* CONFIG_NFS_V4_1 */
5788 
5789 static int decode_sequence(struct xdr_stream *xdr,
5790 			   struct nfs4_sequence_res *res,
5791 			   struct rpc_rqst *rqstp)
5792 {
5793 #if defined(CONFIG_NFS_V4_1)
5794 	struct nfs4_session *session;
5795 	struct nfs4_sessionid id;
5796 	u32 dummy;
5797 	int status;
5798 	__be32 *p;
5799 
5800 	if (res->sr_slot == NULL)
5801 		return 0;
5802 	if (!res->sr_slot->table->session)
5803 		return 0;
5804 
5805 	status = decode_op_hdr(xdr, OP_SEQUENCE);
5806 	if (!status)
5807 		status = decode_sessionid(xdr, &id);
5808 	if (unlikely(status))
5809 		goto out_err;
5810 
5811 	/*
5812 	 * If the server returns different values for sessionID, slotID or
5813 	 * sequence number, the server is looney tunes.
5814 	 */
5815 	status = -EREMOTEIO;
5816 	session = res->sr_slot->table->session;
5817 
5818 	if (memcmp(id.data, session->sess_id.data,
5819 		   NFS4_MAX_SESSIONID_LEN)) {
5820 		dprintk("%s Invalid session id\n", __func__);
5821 		goto out_err;
5822 	}
5823 
5824 	p = xdr_inline_decode(xdr, 20);
5825 	if (unlikely(!p))
5826 		goto out_overflow;
5827 
5828 	/* seqid */
5829 	dummy = be32_to_cpup(p++);
5830 	if (dummy != res->sr_slot->seq_nr) {
5831 		dprintk("%s Invalid sequence number\n", __func__);
5832 		goto out_err;
5833 	}
5834 	/* slot id */
5835 	dummy = be32_to_cpup(p++);
5836 	if (dummy != res->sr_slot->slot_nr) {
5837 		dprintk("%s Invalid slot id\n", __func__);
5838 		goto out_err;
5839 	}
5840 	/* highest slot id */
5841 	res->sr_highest_slotid = be32_to_cpup(p++);
5842 	/* target highest slot id */
5843 	res->sr_target_highest_slotid = be32_to_cpup(p++);
5844 	/* result flags */
5845 	res->sr_status_flags = be32_to_cpup(p);
5846 	status = 0;
5847 out_err:
5848 	res->sr_status = status;
5849 	return status;
5850 out_overflow:
5851 	status = -EIO;
5852 	goto out_err;
5853 #else  /* CONFIG_NFS_V4_1 */
5854 	return 0;
5855 #endif /* CONFIG_NFS_V4_1 */
5856 }
5857 
5858 #if defined(CONFIG_NFS_V4_1)
5859 static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
5860 {
5861 	stateid->type = NFS4_LAYOUT_STATEID_TYPE;
5862 	return decode_stateid(xdr, stateid);
5863 }
5864 
5865 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5866 				struct nfs4_getdeviceinfo_res *res)
5867 {
5868 	struct pnfs_device *pdev = res->pdev;
5869 	__be32 *p;
5870 	uint32_t len, type;
5871 	int status;
5872 
5873 	status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5874 	if (status) {
5875 		if (status == -ETOOSMALL) {
5876 			p = xdr_inline_decode(xdr, 4);
5877 			if (unlikely(!p))
5878 				return -EIO;
5879 			pdev->mincount = be32_to_cpup(p);
5880 			dprintk("%s: Min count too small. mincnt = %u\n",
5881 				__func__, pdev->mincount);
5882 		}
5883 		return status;
5884 	}
5885 
5886 	p = xdr_inline_decode(xdr, 8);
5887 	if (unlikely(!p))
5888 		return -EIO;
5889 	type = be32_to_cpup(p++);
5890 	if (type != pdev->layout_type) {
5891 		dprintk("%s: layout mismatch req: %u pdev: %u\n",
5892 			__func__, pdev->layout_type, type);
5893 		return -EINVAL;
5894 	}
5895 	/*
5896 	 * Get the length of the opaque device_addr4. xdr_read_pages places
5897 	 * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5898 	 * and places the remaining xdr data in xdr_buf->tail
5899 	 */
5900 	pdev->mincount = be32_to_cpup(p);
5901 	if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
5902 		return -EIO;
5903 
5904 	/* Parse notification bitmap, verifying that it is zero. */
5905 	p = xdr_inline_decode(xdr, 4);
5906 	if (unlikely(!p))
5907 		return -EIO;
5908 	len = be32_to_cpup(p);
5909 	if (len) {
5910 		uint32_t i;
5911 
5912 		p = xdr_inline_decode(xdr, 4 * len);
5913 		if (unlikely(!p))
5914 			return -EIO;
5915 
5916 		res->notification = be32_to_cpup(p++);
5917 		for (i = 1; i < len; i++) {
5918 			if (be32_to_cpup(p++)) {
5919 				dprintk("%s: unsupported notification\n",
5920 					__func__);
5921 				return -EIO;
5922 			}
5923 		}
5924 	}
5925 	return 0;
5926 }
5927 
5928 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5929 			    struct nfs4_layoutget_res *res)
5930 {
5931 	__be32 *p;
5932 	int status;
5933 	u32 layout_count;
5934 	u32 recvd;
5935 
5936 	status = decode_op_hdr(xdr, OP_LAYOUTGET);
5937 	if (status)
5938 		goto out;
5939 	p = xdr_inline_decode(xdr, 4);
5940 	if (unlikely(!p))
5941 		goto out_overflow;
5942 	res->return_on_close = be32_to_cpup(p);
5943 	decode_layout_stateid(xdr, &res->stateid);
5944 	p = xdr_inline_decode(xdr, 4);
5945 	if (unlikely(!p))
5946 		goto out_overflow;
5947 	layout_count = be32_to_cpup(p);
5948 	if (!layout_count) {
5949 		dprintk("%s: server responded with empty layout array\n",
5950 			__func__);
5951 		status = -EINVAL;
5952 		goto out;
5953 	}
5954 
5955 	p = xdr_inline_decode(xdr, 28);
5956 	if (unlikely(!p))
5957 		goto out_overflow;
5958 	p = xdr_decode_hyper(p, &res->range.offset);
5959 	p = xdr_decode_hyper(p, &res->range.length);
5960 	res->range.iomode = be32_to_cpup(p++);
5961 	res->type = be32_to_cpup(p++);
5962 	res->layoutp->len = be32_to_cpup(p);
5963 
5964 	dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
5965 		__func__,
5966 		(unsigned long)res->range.offset,
5967 		(unsigned long)res->range.length,
5968 		res->range.iomode,
5969 		res->type,
5970 		res->layoutp->len);
5971 
5972 	recvd = xdr_read_pages(xdr, res->layoutp->len);
5973 	if (res->layoutp->len > recvd) {
5974 		dprintk("NFS: server cheating in layoutget reply: "
5975 				"layout len %u > recvd %u\n",
5976 				res->layoutp->len, recvd);
5977 		status = -EINVAL;
5978 		goto out;
5979 	}
5980 
5981 	if (layout_count > 1) {
5982 		/* We only handle a length one array at the moment.  Any
5983 		 * further entries are just ignored.  Note that this means
5984 		 * the client may see a response that is less than the
5985 		 * minimum it requested.
5986 		 */
5987 		dprintk("%s: server responded with %d layouts, dropping tail\n",
5988 			__func__, layout_count);
5989 	}
5990 
5991 out:
5992 	res->status = status;
5993 	return status;
5994 out_overflow:
5995 	status = -EIO;
5996 	goto out;
5997 }
5998 
5999 static int decode_layoutreturn(struct xdr_stream *xdr,
6000 			       struct nfs4_layoutreturn_res *res)
6001 {
6002 	__be32 *p;
6003 	int status;
6004 
6005 	status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
6006 	if (status)
6007 		return status;
6008 	p = xdr_inline_decode(xdr, 4);
6009 	if (unlikely(!p))
6010 		return -EIO;
6011 	res->lrs_present = be32_to_cpup(p);
6012 	if (res->lrs_present)
6013 		status = decode_layout_stateid(xdr, &res->stateid);
6014 	else
6015 		nfs4_stateid_copy(&res->stateid, &invalid_stateid);
6016 	return status;
6017 }
6018 
6019 static int decode_layoutcommit(struct xdr_stream *xdr,
6020 			       struct rpc_rqst *req,
6021 			       struct nfs4_layoutcommit_res *res)
6022 {
6023 	__be32 *p;
6024 	__u32 sizechanged;
6025 	int status;
6026 
6027 	status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
6028 	res->status = status;
6029 	if (status)
6030 		return status;
6031 
6032 	p = xdr_inline_decode(xdr, 4);
6033 	if (unlikely(!p))
6034 		return -EIO;
6035 	sizechanged = be32_to_cpup(p);
6036 
6037 	if (sizechanged) {
6038 		/* throw away new size */
6039 		p = xdr_inline_decode(xdr, 8);
6040 		if (unlikely(!p))
6041 			return -EIO;
6042 	}
6043 	return 0;
6044 }
6045 
6046 static int decode_test_stateid(struct xdr_stream *xdr,
6047 			       struct nfs41_test_stateid_res *res)
6048 {
6049 	__be32 *p;
6050 	int status;
6051 	int num_res;
6052 
6053 	status = decode_op_hdr(xdr, OP_TEST_STATEID);
6054 	if (status)
6055 		return status;
6056 
6057 	p = xdr_inline_decode(xdr, 4);
6058 	if (unlikely(!p))
6059 		return -EIO;
6060 	num_res = be32_to_cpup(p++);
6061 	if (num_res != 1)
6062 		return -EIO;
6063 
6064 	p = xdr_inline_decode(xdr, 4);
6065 	if (unlikely(!p))
6066 		return -EIO;
6067 	res->status = be32_to_cpup(p++);
6068 
6069 	return status;
6070 }
6071 
6072 static int decode_free_stateid(struct xdr_stream *xdr,
6073 			       struct nfs41_free_stateid_res *res)
6074 {
6075 	res->status = decode_op_hdr(xdr, OP_FREE_STATEID);
6076 	return res->status;
6077 }
6078 #else
6079 static inline
6080 int decode_layoutreturn(struct xdr_stream *xdr,
6081 			       struct nfs4_layoutreturn_res *res)
6082 {
6083 	return 0;
6084 }
6085 
6086 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
6087 			    struct nfs4_layoutget_res *res)
6088 {
6089 	return 0;
6090 }
6091 
6092 #endif /* CONFIG_NFS_V4_1 */
6093 
6094 /*
6095  * END OF "GENERIC" DECODE ROUTINES.
6096  */
6097 
6098 /*
6099  * Decode OPEN_DOWNGRADE response
6100  */
6101 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
6102 				       struct xdr_stream *xdr,
6103 				       void *data)
6104 {
6105 	struct nfs_closeres *res = data;
6106 	struct compound_hdr hdr;
6107 	int status;
6108 
6109 	status = decode_compound_hdr(xdr, &hdr);
6110 	if (status)
6111 		goto out;
6112 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6113 	if (status)
6114 		goto out;
6115 	status = decode_putfh(xdr);
6116 	if (status)
6117 		goto out;
6118 	if (res->lr_res) {
6119 		status = decode_layoutreturn(xdr, res->lr_res);
6120 		res->lr_ret = status;
6121 		if (status)
6122 			goto out;
6123 	}
6124 	status = decode_open_downgrade(xdr, res);
6125 out:
6126 	return status;
6127 }
6128 
6129 /*
6130  * Decode ACCESS response
6131  */
6132 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6133 			       void *data)
6134 {
6135 	struct nfs4_accessres *res = data;
6136 	struct compound_hdr hdr;
6137 	int status;
6138 
6139 	status = decode_compound_hdr(xdr, &hdr);
6140 	if (status)
6141 		goto out;
6142 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6143 	if (status)
6144 		goto out;
6145 	status = decode_putfh(xdr);
6146 	if (status != 0)
6147 		goto out;
6148 	status = decode_access(xdr, &res->supported, &res->access);
6149 	if (status != 0)
6150 		goto out;
6151 	if (res->fattr)
6152 		decode_getfattr(xdr, res->fattr, res->server);
6153 out:
6154 	return status;
6155 }
6156 
6157 /*
6158  * Decode LOOKUP response
6159  */
6160 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6161 			       void *data)
6162 {
6163 	struct nfs4_lookup_res *res = data;
6164 	struct compound_hdr hdr;
6165 	int status;
6166 
6167 	status = decode_compound_hdr(xdr, &hdr);
6168 	if (status)
6169 		goto out;
6170 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6171 	if (status)
6172 		goto out;
6173 	status = decode_putfh(xdr);
6174 	if (status)
6175 		goto out;
6176 	status = decode_lookup(xdr);
6177 	if (status)
6178 		goto out;
6179 	status = decode_getfh(xdr, res->fh);
6180 	if (status)
6181 		goto out;
6182 	status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6183 out:
6184 	return status;
6185 }
6186 
6187 /*
6188  * Decode LOOKUPP response
6189  */
6190 static int nfs4_xdr_dec_lookupp(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6191 		void *data)
6192 {
6193 	struct nfs4_lookupp_res *res = data;
6194 	struct compound_hdr hdr;
6195 	int status;
6196 
6197 	status = decode_compound_hdr(xdr, &hdr);
6198 	if (status)
6199 		goto out;
6200 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6201 	if (status)
6202 		goto out;
6203 	status = decode_putfh(xdr);
6204 	if (status)
6205 		goto out;
6206 	status = decode_lookupp(xdr);
6207 	if (status)
6208 		goto out;
6209 	status = decode_getfh(xdr, res->fh);
6210 	if (status)
6211 		goto out;
6212 	status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6213 out:
6214 	return status;
6215 }
6216 
6217 /*
6218  * Decode LOOKUP_ROOT response
6219  */
6220 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
6221 				    struct xdr_stream *xdr,
6222 				    void *data)
6223 {
6224 	struct nfs4_lookup_res *res = data;
6225 	struct compound_hdr hdr;
6226 	int status;
6227 
6228 	status = decode_compound_hdr(xdr, &hdr);
6229 	if (status)
6230 		goto out;
6231 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6232 	if (status)
6233 		goto out;
6234 	status = decode_putrootfh(xdr);
6235 	if (status)
6236 		goto out;
6237 	status = decode_getfh(xdr, res->fh);
6238 	if (status == 0)
6239 		status = decode_getfattr_label(xdr, res->fattr,
6240 						res->label, res->server);
6241 out:
6242 	return status;
6243 }
6244 
6245 /*
6246  * Decode REMOVE response
6247  */
6248 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6249 			       void *data)
6250 {
6251 	struct nfs_removeres *res = data;
6252 	struct compound_hdr hdr;
6253 	int status;
6254 
6255 	status = decode_compound_hdr(xdr, &hdr);
6256 	if (status)
6257 		goto out;
6258 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6259 	if (status)
6260 		goto out;
6261 	status = decode_putfh(xdr);
6262 	if (status)
6263 		goto out;
6264 	status = decode_remove(xdr, &res->cinfo);
6265 out:
6266 	return status;
6267 }
6268 
6269 /*
6270  * Decode RENAME response
6271  */
6272 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6273 			       void *data)
6274 {
6275 	struct nfs_renameres *res = data;
6276 	struct compound_hdr hdr;
6277 	int status;
6278 
6279 	status = decode_compound_hdr(xdr, &hdr);
6280 	if (status)
6281 		goto out;
6282 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6283 	if (status)
6284 		goto out;
6285 	status = decode_putfh(xdr);
6286 	if (status)
6287 		goto out;
6288 	status = decode_savefh(xdr);
6289 	if (status)
6290 		goto out;
6291 	status = decode_putfh(xdr);
6292 	if (status)
6293 		goto out;
6294 	status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
6295 out:
6296 	return status;
6297 }
6298 
6299 /*
6300  * Decode LINK response
6301  */
6302 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6303 			     void *data)
6304 {
6305 	struct nfs4_link_res *res = data;
6306 	struct compound_hdr hdr;
6307 	int status;
6308 
6309 	status = decode_compound_hdr(xdr, &hdr);
6310 	if (status)
6311 		goto out;
6312 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6313 	if (status)
6314 		goto out;
6315 	status = decode_putfh(xdr);
6316 	if (status)
6317 		goto out;
6318 	status = decode_savefh(xdr);
6319 	if (status)
6320 		goto out;
6321 	status = decode_putfh(xdr);
6322 	if (status)
6323 		goto out;
6324 	status = decode_link(xdr, &res->cinfo);
6325 	if (status)
6326 		goto out;
6327 	/*
6328 	 * Note order: OP_LINK leaves the directory as the current
6329 	 *             filehandle.
6330 	 */
6331 	status = decode_restorefh(xdr);
6332 	if (status)
6333 		goto out;
6334 	decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6335 out:
6336 	return status;
6337 }
6338 
6339 /*
6340  * Decode CREATE response
6341  */
6342 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6343 			       void *data)
6344 {
6345 	struct nfs4_create_res *res = data;
6346 	struct compound_hdr hdr;
6347 	int status;
6348 
6349 	status = decode_compound_hdr(xdr, &hdr);
6350 	if (status)
6351 		goto out;
6352 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6353 	if (status)
6354 		goto out;
6355 	status = decode_putfh(xdr);
6356 	if (status)
6357 		goto out;
6358 	status = decode_create(xdr, &res->dir_cinfo);
6359 	if (status)
6360 		goto out;
6361 	status = decode_getfh(xdr, res->fh);
6362 	if (status)
6363 		goto out;
6364 	decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6365 out:
6366 	return status;
6367 }
6368 
6369 /*
6370  * Decode SYMLINK response
6371  */
6372 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6373 				void *res)
6374 {
6375 	return nfs4_xdr_dec_create(rqstp, xdr, res);
6376 }
6377 
6378 /*
6379  * Decode GETATTR response
6380  */
6381 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6382 				void *data)
6383 {
6384 	struct nfs4_getattr_res *res = data;
6385 	struct compound_hdr hdr;
6386 	int status;
6387 
6388 	status = decode_compound_hdr(xdr, &hdr);
6389 	if (status)
6390 		goto out;
6391 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6392 	if (status)
6393 		goto out;
6394 	status = decode_putfh(xdr);
6395 	if (status)
6396 		goto out;
6397 	status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6398 out:
6399 	return status;
6400 }
6401 
6402 /*
6403  * Encode an SETACL request
6404  */
6405 static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
6406 				const void *data)
6407 {
6408 	const struct nfs_setaclargs *args = data;
6409 	struct compound_hdr hdr = {
6410 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
6411 	};
6412 
6413 	encode_compound_hdr(xdr, req, &hdr);
6414 	encode_sequence(xdr, &args->seq_args, &hdr);
6415 	encode_putfh(xdr, args->fh, &hdr);
6416 	encode_setacl(xdr, args, &hdr);
6417 	encode_nops(&hdr);
6418 }
6419 
6420 /*
6421  * Decode SETACL response
6422  */
6423 static int
6424 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6425 		    void *data)
6426 {
6427 	struct nfs_setaclres *res = data;
6428 	struct compound_hdr hdr;
6429 	int status;
6430 
6431 	status = decode_compound_hdr(xdr, &hdr);
6432 	if (status)
6433 		goto out;
6434 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6435 	if (status)
6436 		goto out;
6437 	status = decode_putfh(xdr);
6438 	if (status)
6439 		goto out;
6440 	status = decode_setattr(xdr);
6441 out:
6442 	return status;
6443 }
6444 
6445 /*
6446  * Decode GETACL response
6447  */
6448 static int
6449 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6450 		    void *data)
6451 {
6452 	struct nfs_getaclres *res = data;
6453 	struct compound_hdr hdr;
6454 	int status;
6455 
6456 	if (res->acl_scratch != NULL)
6457 		xdr_set_scratch_page(xdr, res->acl_scratch);
6458 	status = decode_compound_hdr(xdr, &hdr);
6459 	if (status)
6460 		goto out;
6461 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6462 	if (status)
6463 		goto out;
6464 	status = decode_putfh(xdr);
6465 	if (status)
6466 		goto out;
6467 	status = decode_getacl(xdr, rqstp, res);
6468 
6469 out:
6470 	return status;
6471 }
6472 
6473 /*
6474  * Decode CLOSE response
6475  */
6476 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6477 			      void *data)
6478 {
6479 	struct nfs_closeres *res = data;
6480 	struct compound_hdr hdr;
6481 	int status;
6482 
6483 	status = decode_compound_hdr(xdr, &hdr);
6484 	if (status)
6485 		goto out;
6486 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6487 	if (status)
6488 		goto out;
6489 	status = decode_putfh(xdr);
6490 	if (status)
6491 		goto out;
6492 	if (res->lr_res) {
6493 		status = decode_layoutreturn(xdr, res->lr_res);
6494 		res->lr_ret = status;
6495 		if (status)
6496 			goto out;
6497 	}
6498 	if (res->fattr != NULL) {
6499 		status = decode_getfattr(xdr, res->fattr, res->server);
6500 		if (status != 0)
6501 			goto out;
6502 	}
6503 	status = decode_close(xdr, res);
6504 out:
6505 	return status;
6506 }
6507 
6508 /*
6509  * Decode OPEN response
6510  */
6511 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6512 			     void *data)
6513 {
6514 	struct nfs_openres *res = data;
6515 	struct compound_hdr hdr;
6516 	int status;
6517 
6518 	status = decode_compound_hdr(xdr, &hdr);
6519 	if (status)
6520 		goto out;
6521 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6522 	if (status)
6523 		goto out;
6524 	status = decode_putfh(xdr);
6525 	if (status)
6526 		goto out;
6527 	status = decode_open(xdr, res);
6528 	if (status)
6529 		goto out;
6530 	status = decode_getfh(xdr, &res->fh);
6531 	if (status)
6532 		goto out;
6533 	if (res->access_request)
6534 		decode_access(xdr, &res->access_supported, &res->access_result);
6535 	decode_getfattr_label(xdr, res->f_attr, res->f_label, res->server);
6536 	if (res->lg_res)
6537 		decode_layoutget(xdr, rqstp, res->lg_res);
6538 out:
6539 	return status;
6540 }
6541 
6542 /*
6543  * Decode OPEN_CONFIRM response
6544  */
6545 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
6546 				     struct xdr_stream *xdr,
6547 				     void *data)
6548 {
6549 	struct nfs_open_confirmres *res = data;
6550 	struct compound_hdr hdr;
6551 	int status;
6552 
6553 	status = decode_compound_hdr(xdr, &hdr);
6554 	if (status)
6555 		goto out;
6556 	status = decode_putfh(xdr);
6557 	if (status)
6558 		goto out;
6559 	status = decode_open_confirm(xdr, res);
6560 out:
6561 	return status;
6562 }
6563 
6564 /*
6565  * Decode OPEN response
6566  */
6567 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
6568 				    struct xdr_stream *xdr,
6569 				    void *data)
6570 {
6571 	struct nfs_openres *res = data;
6572 	struct compound_hdr hdr;
6573 	int status;
6574 
6575 	status = decode_compound_hdr(xdr, &hdr);
6576 	if (status)
6577 		goto out;
6578 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6579 	if (status)
6580 		goto out;
6581 	status = decode_putfh(xdr);
6582 	if (status)
6583 		goto out;
6584 	status = decode_open(xdr, res);
6585 	if (status)
6586 		goto out;
6587 	if (res->access_request)
6588 		decode_access(xdr, &res->access_supported, &res->access_result);
6589 	decode_getfattr(xdr, res->f_attr, res->server);
6590 	if (res->lg_res)
6591 		decode_layoutget(xdr, rqstp, res->lg_res);
6592 out:
6593 	return status;
6594 }
6595 
6596 /*
6597  * Decode SETATTR response
6598  */
6599 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
6600 				struct xdr_stream *xdr,
6601 				void *data)
6602 {
6603 	struct nfs_setattrres *res = data;
6604 	struct compound_hdr hdr;
6605 	int status;
6606 
6607 	status = decode_compound_hdr(xdr, &hdr);
6608 	if (status)
6609 		goto out;
6610 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6611 	if (status)
6612 		goto out;
6613 	status = decode_putfh(xdr);
6614 	if (status)
6615 		goto out;
6616 	status = decode_setattr(xdr);
6617 	if (status)
6618 		goto out;
6619 	decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6620 out:
6621 	return status;
6622 }
6623 
6624 /*
6625  * Decode LOCK response
6626  */
6627 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6628 			     void *data)
6629 {
6630 	struct nfs_lock_res *res = data;
6631 	struct compound_hdr hdr;
6632 	int status;
6633 
6634 	status = decode_compound_hdr(xdr, &hdr);
6635 	if (status)
6636 		goto out;
6637 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6638 	if (status)
6639 		goto out;
6640 	status = decode_putfh(xdr);
6641 	if (status)
6642 		goto out;
6643 	status = decode_lock(xdr, res);
6644 out:
6645 	return status;
6646 }
6647 
6648 /*
6649  * Decode LOCKT response
6650  */
6651 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6652 			      void *data)
6653 {
6654 	struct nfs_lockt_res *res = data;
6655 	struct compound_hdr hdr;
6656 	int status;
6657 
6658 	status = decode_compound_hdr(xdr, &hdr);
6659 	if (status)
6660 		goto out;
6661 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6662 	if (status)
6663 		goto out;
6664 	status = decode_putfh(xdr);
6665 	if (status)
6666 		goto out;
6667 	status = decode_lockt(xdr, res);
6668 out:
6669 	return status;
6670 }
6671 
6672 /*
6673  * Decode LOCKU response
6674  */
6675 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6676 			      void *data)
6677 {
6678 	struct nfs_locku_res *res = data;
6679 	struct compound_hdr hdr;
6680 	int status;
6681 
6682 	status = decode_compound_hdr(xdr, &hdr);
6683 	if (status)
6684 		goto out;
6685 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6686 	if (status)
6687 		goto out;
6688 	status = decode_putfh(xdr);
6689 	if (status)
6690 		goto out;
6691 	status = decode_locku(xdr, res);
6692 out:
6693 	return status;
6694 }
6695 
6696 static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
6697 					  struct xdr_stream *xdr, void *dummy)
6698 {
6699 	struct compound_hdr hdr;
6700 	int status;
6701 
6702 	status = decode_compound_hdr(xdr, &hdr);
6703 	if (!status)
6704 		status = decode_release_lockowner(xdr);
6705 	return status;
6706 }
6707 
6708 /*
6709  * Decode READLINK response
6710  */
6711 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
6712 				 struct xdr_stream *xdr,
6713 				 void *data)
6714 {
6715 	struct nfs4_readlink_res *res = data;
6716 	struct compound_hdr hdr;
6717 	int status;
6718 
6719 	status = decode_compound_hdr(xdr, &hdr);
6720 	if (status)
6721 		goto out;
6722 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6723 	if (status)
6724 		goto out;
6725 	status = decode_putfh(xdr);
6726 	if (status)
6727 		goto out;
6728 	status = decode_readlink(xdr, rqstp);
6729 out:
6730 	return status;
6731 }
6732 
6733 /*
6734  * Decode READDIR response
6735  */
6736 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6737 				void *data)
6738 {
6739 	struct nfs4_readdir_res *res = data;
6740 	struct compound_hdr hdr;
6741 	int status;
6742 
6743 	status = decode_compound_hdr(xdr, &hdr);
6744 	if (status)
6745 		goto out;
6746 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6747 	if (status)
6748 		goto out;
6749 	status = decode_putfh(xdr);
6750 	if (status)
6751 		goto out;
6752 	status = decode_readdir(xdr, rqstp, res);
6753 out:
6754 	return status;
6755 }
6756 
6757 /*
6758  * Decode Read response
6759  */
6760 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6761 			     void *data)
6762 {
6763 	struct nfs_pgio_res *res = data;
6764 	struct compound_hdr hdr;
6765 	int status;
6766 
6767 	status = decode_compound_hdr(xdr, &hdr);
6768 	res->op_status = hdr.status;
6769 	if (status)
6770 		goto out;
6771 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6772 	if (status)
6773 		goto out;
6774 	status = decode_putfh(xdr);
6775 	if (status)
6776 		goto out;
6777 	status = decode_read(xdr, rqstp, res);
6778 	if (!status)
6779 		status = res->count;
6780 out:
6781 	return status;
6782 }
6783 
6784 /*
6785  * Decode WRITE response
6786  */
6787 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6788 			      void *data)
6789 {
6790 	struct nfs_pgio_res *res = data;
6791 	struct compound_hdr hdr;
6792 	int status;
6793 
6794 	status = decode_compound_hdr(xdr, &hdr);
6795 	res->op_status = hdr.status;
6796 	if (status)
6797 		goto out;
6798 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6799 	if (status)
6800 		goto out;
6801 	status = decode_putfh(xdr);
6802 	if (status)
6803 		goto out;
6804 	status = decode_write(xdr, res);
6805 	if (status)
6806 		goto out;
6807 	if (res->fattr)
6808 		decode_getfattr(xdr, res->fattr, res->server);
6809 	if (!status)
6810 		status = res->count;
6811 out:
6812 	return status;
6813 }
6814 
6815 /*
6816  * Decode COMMIT response
6817  */
6818 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6819 			       void *data)
6820 {
6821 	struct nfs_commitres *res = data;
6822 	struct compound_hdr hdr;
6823 	int status;
6824 
6825 	status = decode_compound_hdr(xdr, &hdr);
6826 	res->op_status = hdr.status;
6827 	if (status)
6828 		goto out;
6829 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6830 	if (status)
6831 		goto out;
6832 	status = decode_putfh(xdr);
6833 	if (status)
6834 		goto out;
6835 	status = decode_commit(xdr, res);
6836 out:
6837 	return status;
6838 }
6839 
6840 /*
6841  * Decode FSINFO response
6842  */
6843 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
6844 			       void *data)
6845 {
6846 	struct nfs4_fsinfo_res *res = data;
6847 	struct compound_hdr hdr;
6848 	int status;
6849 
6850 	status = decode_compound_hdr(xdr, &hdr);
6851 	if (!status)
6852 		status = decode_sequence(xdr, &res->seq_res, req);
6853 	if (!status)
6854 		status = decode_putfh(xdr);
6855 	if (!status)
6856 		status = decode_fsinfo(xdr, res->fsinfo);
6857 	return status;
6858 }
6859 
6860 /*
6861  * Decode PATHCONF response
6862  */
6863 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
6864 				 void *data)
6865 {
6866 	struct nfs4_pathconf_res *res = data;
6867 	struct compound_hdr hdr;
6868 	int status;
6869 
6870 	status = decode_compound_hdr(xdr, &hdr);
6871 	if (!status)
6872 		status = decode_sequence(xdr, &res->seq_res, req);
6873 	if (!status)
6874 		status = decode_putfh(xdr);
6875 	if (!status)
6876 		status = decode_pathconf(xdr, res->pathconf);
6877 	return status;
6878 }
6879 
6880 /*
6881  * Decode STATFS response
6882  */
6883 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
6884 			       void *data)
6885 {
6886 	struct nfs4_statfs_res *res = data;
6887 	struct compound_hdr hdr;
6888 	int status;
6889 
6890 	status = decode_compound_hdr(xdr, &hdr);
6891 	if (!status)
6892 		status = decode_sequence(xdr, &res->seq_res, req);
6893 	if (!status)
6894 		status = decode_putfh(xdr);
6895 	if (!status)
6896 		status = decode_statfs(xdr, res->fsstat);
6897 	return status;
6898 }
6899 
6900 /*
6901  * Decode GETATTR_BITMAP response
6902  */
6903 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
6904 				    struct xdr_stream *xdr,
6905 				    void *data)
6906 {
6907 	struct nfs4_server_caps_res *res = data;
6908 	struct compound_hdr hdr;
6909 	int status;
6910 
6911 	status = decode_compound_hdr(xdr, &hdr);
6912 	if (status)
6913 		goto out;
6914 	status = decode_sequence(xdr, &res->seq_res, req);
6915 	if (status)
6916 		goto out;
6917 	status = decode_putfh(xdr);
6918 	if (status)
6919 		goto out;
6920 	status = decode_server_caps(xdr, res);
6921 out:
6922 	return status;
6923 }
6924 
6925 /*
6926  * Decode RENEW response
6927  */
6928 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6929 			      void *__unused)
6930 {
6931 	struct compound_hdr hdr;
6932 	int status;
6933 
6934 	status = decode_compound_hdr(xdr, &hdr);
6935 	if (!status)
6936 		status = decode_renew(xdr);
6937 	return status;
6938 }
6939 
6940 /*
6941  * Decode SETCLIENTID response
6942  */
6943 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
6944 				    struct xdr_stream *xdr,
6945 				    void *data)
6946 {
6947 	struct nfs4_setclientid_res *res = data;
6948 	struct compound_hdr hdr;
6949 	int status;
6950 
6951 	status = decode_compound_hdr(xdr, &hdr);
6952 	if (!status)
6953 		status = decode_setclientid(xdr, res);
6954 	return status;
6955 }
6956 
6957 /*
6958  * Decode SETCLIENTID_CONFIRM response
6959  */
6960 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
6961 					    struct xdr_stream *xdr,
6962 					    void *data)
6963 {
6964 	struct compound_hdr hdr;
6965 	int status;
6966 
6967 	status = decode_compound_hdr(xdr, &hdr);
6968 	if (!status)
6969 		status = decode_setclientid_confirm(xdr);
6970 	return status;
6971 }
6972 
6973 /*
6974  * Decode DELEGRETURN response
6975  */
6976 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
6977 				    struct xdr_stream *xdr,
6978 				    void *data)
6979 {
6980 	struct nfs4_delegreturnres *res = data;
6981 	struct compound_hdr hdr;
6982 	int status;
6983 
6984 	status = decode_compound_hdr(xdr, &hdr);
6985 	if (status)
6986 		goto out;
6987 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6988 	if (status)
6989 		goto out;
6990 	status = decode_putfh(xdr);
6991 	if (status != 0)
6992 		goto out;
6993 	if (res->lr_res) {
6994 		status = decode_layoutreturn(xdr, res->lr_res);
6995 		res->lr_ret = status;
6996 		if (status)
6997 			goto out;
6998 	}
6999 	if (res->fattr) {
7000 		status = decode_getfattr(xdr, res->fattr, res->server);
7001 		if (status != 0)
7002 			goto out;
7003 	}
7004 	status = decode_delegreturn(xdr);
7005 out:
7006 	return status;
7007 }
7008 
7009 /*
7010  * Decode FS_LOCATIONS response
7011  */
7012 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
7013 				     struct xdr_stream *xdr,
7014 				     void *data)
7015 {
7016 	struct nfs4_fs_locations_res *res = data;
7017 	struct compound_hdr hdr;
7018 	int status;
7019 
7020 	status = decode_compound_hdr(xdr, &hdr);
7021 	if (status)
7022 		goto out;
7023 	status = decode_sequence(xdr, &res->seq_res, req);
7024 	if (status)
7025 		goto out;
7026 	status = decode_putfh(xdr);
7027 	if (status)
7028 		goto out;
7029 	if (res->migration) {
7030 		xdr_enter_page(xdr, PAGE_SIZE);
7031 		status = decode_getfattr_generic(xdr,
7032 					&res->fs_locations->fattr,
7033 					 NULL, res->fs_locations,
7034 					 NULL, res->fs_locations->server);
7035 		if (status)
7036 			goto out;
7037 		if (res->renew)
7038 			status = decode_renew(xdr);
7039 	} else {
7040 		status = decode_lookup(xdr);
7041 		if (status)
7042 			goto out;
7043 		xdr_enter_page(xdr, PAGE_SIZE);
7044 		status = decode_getfattr_generic(xdr,
7045 					&res->fs_locations->fattr,
7046 					 NULL, res->fs_locations,
7047 					 NULL, res->fs_locations->server);
7048 	}
7049 out:
7050 	return status;
7051 }
7052 
7053 /*
7054  * Decode SECINFO response
7055  */
7056 static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
7057 				struct xdr_stream *xdr,
7058 				void *data)
7059 {
7060 	struct nfs4_secinfo_res *res = data;
7061 	struct compound_hdr hdr;
7062 	int status;
7063 
7064 	status = decode_compound_hdr(xdr, &hdr);
7065 	if (status)
7066 		goto out;
7067 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7068 	if (status)
7069 		goto out;
7070 	status = decode_putfh(xdr);
7071 	if (status)
7072 		goto out;
7073 	status = decode_secinfo(xdr, res);
7074 out:
7075 	return status;
7076 }
7077 
7078 /*
7079  * Decode FSID_PRESENT response
7080  */
7081 static int nfs4_xdr_dec_fsid_present(struct rpc_rqst *rqstp,
7082 				     struct xdr_stream *xdr,
7083 				     void *data)
7084 {
7085 	struct nfs4_fsid_present_res *res = data;
7086 	struct compound_hdr hdr;
7087 	int status;
7088 
7089 	status = decode_compound_hdr(xdr, &hdr);
7090 	if (status)
7091 		goto out;
7092 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7093 	if (status)
7094 		goto out;
7095 	status = decode_putfh(xdr);
7096 	if (status)
7097 		goto out;
7098 	status = decode_getfh(xdr, res->fh);
7099 	if (status)
7100 		goto out;
7101 	if (res->renew)
7102 		status = decode_renew(xdr);
7103 out:
7104 	return status;
7105 }
7106 
7107 #if defined(CONFIG_NFS_V4_1)
7108 /*
7109  * Decode BIND_CONN_TO_SESSION response
7110  */
7111 static int nfs4_xdr_dec_bind_conn_to_session(struct rpc_rqst *rqstp,
7112 					struct xdr_stream *xdr,
7113 					void *res)
7114 {
7115 	struct compound_hdr hdr;
7116 	int status;
7117 
7118 	status = decode_compound_hdr(xdr, &hdr);
7119 	if (!status)
7120 		status = decode_bind_conn_to_session(xdr, res);
7121 	return status;
7122 }
7123 
7124 /*
7125  * Decode EXCHANGE_ID response
7126  */
7127 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
7128 				    struct xdr_stream *xdr,
7129 				    void *res)
7130 {
7131 	struct compound_hdr hdr;
7132 	int status;
7133 
7134 	status = decode_compound_hdr(xdr, &hdr);
7135 	if (!status)
7136 		status = decode_exchange_id(xdr, res);
7137 	return status;
7138 }
7139 
7140 /*
7141  * Decode CREATE_SESSION response
7142  */
7143 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
7144 				       struct xdr_stream *xdr,
7145 				       void *res)
7146 {
7147 	struct compound_hdr hdr;
7148 	int status;
7149 
7150 	status = decode_compound_hdr(xdr, &hdr);
7151 	if (!status)
7152 		status = decode_create_session(xdr, res);
7153 	return status;
7154 }
7155 
7156 /*
7157  * Decode DESTROY_SESSION response
7158  */
7159 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
7160 					struct xdr_stream *xdr,
7161 					void *res)
7162 {
7163 	struct compound_hdr hdr;
7164 	int status;
7165 
7166 	status = decode_compound_hdr(xdr, &hdr);
7167 	if (!status)
7168 		status = decode_destroy_session(xdr, res);
7169 	return status;
7170 }
7171 
7172 /*
7173  * Decode DESTROY_CLIENTID response
7174  */
7175 static int nfs4_xdr_dec_destroy_clientid(struct rpc_rqst *rqstp,
7176 					struct xdr_stream *xdr,
7177 					void *res)
7178 {
7179 	struct compound_hdr hdr;
7180 	int status;
7181 
7182 	status = decode_compound_hdr(xdr, &hdr);
7183 	if (!status)
7184 		status = decode_destroy_clientid(xdr, res);
7185 	return status;
7186 }
7187 
7188 /*
7189  * Decode SEQUENCE response
7190  */
7191 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
7192 				 struct xdr_stream *xdr,
7193 				 void *res)
7194 {
7195 	struct compound_hdr hdr;
7196 	int status;
7197 
7198 	status = decode_compound_hdr(xdr, &hdr);
7199 	if (!status)
7200 		status = decode_sequence(xdr, res, rqstp);
7201 	return status;
7202 }
7203 
7204 #endif
7205 
7206 /*
7207  * Decode GET_LEASE_TIME response
7208  */
7209 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
7210 				       struct xdr_stream *xdr,
7211 				       void *data)
7212 {
7213 	struct nfs4_get_lease_time_res *res = data;
7214 	struct compound_hdr hdr;
7215 	int status;
7216 
7217 	status = decode_compound_hdr(xdr, &hdr);
7218 	if (!status)
7219 		status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
7220 	if (!status)
7221 		status = decode_putrootfh(xdr);
7222 	if (!status)
7223 		status = decode_fsinfo(xdr, res->lr_fsinfo);
7224 	return status;
7225 }
7226 
7227 #ifdef CONFIG_NFS_V4_1
7228 
7229 /*
7230  * Decode RECLAIM_COMPLETE response
7231  */
7232 static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
7233 					 struct xdr_stream *xdr,
7234 					 void *data)
7235 {
7236 	struct nfs41_reclaim_complete_res *res = data;
7237 	struct compound_hdr hdr;
7238 	int status;
7239 
7240 	status = decode_compound_hdr(xdr, &hdr);
7241 	if (!status)
7242 		status = decode_sequence(xdr, &res->seq_res, rqstp);
7243 	if (!status)
7244 		status = decode_reclaim_complete(xdr, NULL);
7245 	return status;
7246 }
7247 
7248 /*
7249  * Decode GETDEVINFO response
7250  */
7251 static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
7252 				      struct xdr_stream *xdr,
7253 				      void *data)
7254 {
7255 	struct nfs4_getdeviceinfo_res *res = data;
7256 	struct compound_hdr hdr;
7257 	int status;
7258 
7259 	status = decode_compound_hdr(xdr, &hdr);
7260 	if (status != 0)
7261 		goto out;
7262 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7263 	if (status != 0)
7264 		goto out;
7265 	status = decode_getdeviceinfo(xdr, res);
7266 out:
7267 	return status;
7268 }
7269 
7270 /*
7271  * Decode LAYOUTGET response
7272  */
7273 static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
7274 				  struct xdr_stream *xdr,
7275 				  void *data)
7276 {
7277 	struct nfs4_layoutget_res *res = data;
7278 	struct compound_hdr hdr;
7279 	int status;
7280 
7281 	status = decode_compound_hdr(xdr, &hdr);
7282 	if (status)
7283 		goto out;
7284 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7285 	if (status)
7286 		goto out;
7287 	status = decode_putfh(xdr);
7288 	if (status)
7289 		goto out;
7290 	status = decode_layoutget(xdr, rqstp, res);
7291 out:
7292 	return status;
7293 }
7294 
7295 /*
7296  * Decode LAYOUTRETURN response
7297  */
7298 static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
7299 				     struct xdr_stream *xdr,
7300 				     void *data)
7301 {
7302 	struct nfs4_layoutreturn_res *res = data;
7303 	struct compound_hdr hdr;
7304 	int status;
7305 
7306 	status = decode_compound_hdr(xdr, &hdr);
7307 	if (status)
7308 		goto out;
7309 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7310 	if (status)
7311 		goto out;
7312 	status = decode_putfh(xdr);
7313 	if (status)
7314 		goto out;
7315 	status = decode_layoutreturn(xdr, res);
7316 out:
7317 	return status;
7318 }
7319 
7320 /*
7321  * Decode LAYOUTCOMMIT response
7322  */
7323 static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
7324 				     struct xdr_stream *xdr,
7325 				     void *data)
7326 {
7327 	struct nfs4_layoutcommit_res *res = data;
7328 	struct compound_hdr hdr;
7329 	int status;
7330 
7331 	status = decode_compound_hdr(xdr, &hdr);
7332 	if (status)
7333 		goto out;
7334 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7335 	if (status)
7336 		goto out;
7337 	status = decode_putfh(xdr);
7338 	if (status)
7339 		goto out;
7340 	status = decode_layoutcommit(xdr, rqstp, res);
7341 	if (status)
7342 		goto out;
7343 	decode_getfattr(xdr, res->fattr, res->server);
7344 out:
7345 	return status;
7346 }
7347 
7348 /*
7349  * Decode SECINFO_NO_NAME response
7350  */
7351 static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
7352 					struct xdr_stream *xdr,
7353 					void *data)
7354 {
7355 	struct nfs4_secinfo_res *res = data;
7356 	struct compound_hdr hdr;
7357 	int status;
7358 
7359 	status = decode_compound_hdr(xdr, &hdr);
7360 	if (status)
7361 		goto out;
7362 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7363 	if (status)
7364 		goto out;
7365 	status = decode_putrootfh(xdr);
7366 	if (status)
7367 		goto out;
7368 	status = decode_secinfo_no_name(xdr, res);
7369 out:
7370 	return status;
7371 }
7372 
7373 /*
7374  * Decode TEST_STATEID response
7375  */
7376 static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
7377 				     struct xdr_stream *xdr,
7378 				     void *data)
7379 {
7380 	struct nfs41_test_stateid_res *res = data;
7381 	struct compound_hdr hdr;
7382 	int status;
7383 
7384 	status = decode_compound_hdr(xdr, &hdr);
7385 	if (status)
7386 		goto out;
7387 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7388 	if (status)
7389 		goto out;
7390 	status = decode_test_stateid(xdr, res);
7391 out:
7392 	return status;
7393 }
7394 
7395 /*
7396  * Decode FREE_STATEID response
7397  */
7398 static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
7399 				     struct xdr_stream *xdr,
7400 				     void *data)
7401 {
7402 	struct nfs41_free_stateid_res *res = data;
7403 	struct compound_hdr hdr;
7404 	int status;
7405 
7406 	status = decode_compound_hdr(xdr, &hdr);
7407 	if (status)
7408 		goto out;
7409 	status = decode_sequence(xdr, &res->seq_res, rqstp);
7410 	if (status)
7411 		goto out;
7412 	status = decode_free_stateid(xdr, res);
7413 out:
7414 	return status;
7415 }
7416 #endif /* CONFIG_NFS_V4_1 */
7417 
7418 /**
7419  * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
7420  *                      the local page cache.
7421  * @xdr: XDR stream where entry resides
7422  * @entry: buffer to fill in with entry data
7423  * @plus: boolean indicating whether this should be a readdirplus entry
7424  *
7425  * Returns zero if successful, otherwise a negative errno value is
7426  * returned.
7427  *
7428  * This function is not invoked during READDIR reply decoding, but
7429  * rather whenever an application invokes the getdents(2) system call
7430  * on a directory already in our cache.
7431  */
7432 int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
7433 		       bool plus)
7434 {
7435 	unsigned int savep;
7436 	uint32_t bitmap[3] = {0};
7437 	uint32_t len;
7438 	uint64_t new_cookie;
7439 	__be32 *p = xdr_inline_decode(xdr, 4);
7440 	if (unlikely(!p))
7441 		return -EAGAIN;
7442 	if (*p == xdr_zero) {
7443 		p = xdr_inline_decode(xdr, 4);
7444 		if (unlikely(!p))
7445 			return -EAGAIN;
7446 		if (*p == xdr_zero)
7447 			return -EAGAIN;
7448 		entry->eof = 1;
7449 		return -EBADCOOKIE;
7450 	}
7451 
7452 	p = xdr_inline_decode(xdr, 12);
7453 	if (unlikely(!p))
7454 		return -EAGAIN;
7455 	p = xdr_decode_hyper(p, &new_cookie);
7456 	entry->len = be32_to_cpup(p);
7457 
7458 	p = xdr_inline_decode(xdr, entry->len);
7459 	if (unlikely(!p))
7460 		return -EAGAIN;
7461 	entry->name = (const char *) p;
7462 
7463 	/*
7464 	 * In case the server doesn't return an inode number,
7465 	 * we fake one here.  (We don't use inode number 0,
7466 	 * since glibc seems to choke on it...)
7467 	 */
7468 	entry->ino = 1;
7469 	entry->fattr->valid = 0;
7470 
7471 	if (decode_attr_bitmap(xdr, bitmap) < 0)
7472 		return -EAGAIN;
7473 
7474 	if (decode_attr_length(xdr, &len, &savep) < 0)
7475 		return -EAGAIN;
7476 
7477 	if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
7478 			NULL, entry->label, entry->server) < 0)
7479 		return -EAGAIN;
7480 	if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
7481 		entry->ino = entry->fattr->mounted_on_fileid;
7482 	else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
7483 		entry->ino = entry->fattr->fileid;
7484 
7485 	entry->d_type = DT_UNKNOWN;
7486 	if (entry->fattr->valid & NFS_ATTR_FATTR_TYPE)
7487 		entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
7488 
7489 	entry->prev_cookie = entry->cookie;
7490 	entry->cookie = new_cookie;
7491 
7492 	return 0;
7493 }
7494 
7495 /*
7496  * We need to translate between nfs status return values and
7497  * the local errno values which may not be the same.
7498  */
7499 static struct {
7500 	int stat;
7501 	int errno;
7502 } nfs_errtbl[] = {
7503 	{ NFS4_OK,		0		},
7504 	{ NFS4ERR_PERM,		-EPERM		},
7505 	{ NFS4ERR_NOENT,	-ENOENT		},
7506 	{ NFS4ERR_IO,		-errno_NFSERR_IO},
7507 	{ NFS4ERR_NXIO,		-ENXIO		},
7508 	{ NFS4ERR_ACCESS,	-EACCES		},
7509 	{ NFS4ERR_EXIST,	-EEXIST		},
7510 	{ NFS4ERR_XDEV,		-EXDEV		},
7511 	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
7512 	{ NFS4ERR_ISDIR,	-EISDIR		},
7513 	{ NFS4ERR_INVAL,	-EINVAL		},
7514 	{ NFS4ERR_FBIG,		-EFBIG		},
7515 	{ NFS4ERR_NOSPC,	-ENOSPC		},
7516 	{ NFS4ERR_ROFS,		-EROFS		},
7517 	{ NFS4ERR_MLINK,	-EMLINK		},
7518 	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
7519 	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
7520 	{ NFS4ERR_DQUOT,	-EDQUOT		},
7521 	{ NFS4ERR_STALE,	-ESTALE		},
7522 	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
7523 	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
7524 	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
7525 	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
7526 	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
7527 	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
7528 	{ NFS4ERR_LOCKED,	-EAGAIN		},
7529 	{ NFS4ERR_SYMLINK,	-ELOOP		},
7530 	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
7531 	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
7532 	{ NFS4ERR_NOXATTR,	-ENODATA	},
7533 	{ NFS4ERR_XATTR2BIG,	-E2BIG		},
7534 	{ -1,			-EIO		}
7535 };
7536 
7537 /*
7538  * Convert an NFS error code to a local one.
7539  * This one is used jointly by NFSv2 and NFSv3.
7540  */
7541 static int
7542 nfs4_stat_to_errno(int stat)
7543 {
7544 	int i;
7545 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
7546 		if (nfs_errtbl[i].stat == stat)
7547 			return nfs_errtbl[i].errno;
7548 	}
7549 	if (stat <= 10000 || stat > 10100) {
7550 		/* The server is looney tunes. */
7551 		return -EREMOTEIO;
7552 	}
7553 	/* If we cannot translate the error, the recovery routines should
7554 	 * handle it.
7555 	 * Note: remaining NFSv4 error codes have values > 10000, so should
7556 	 * not conflict with native Linux error codes.
7557 	 */
7558 	return -stat;
7559 }
7560 
7561 #ifdef CONFIG_NFS_V4_2
7562 #include "nfs42xdr.c"
7563 #endif /* CONFIG_NFS_V4_2 */
7564 
7565 #define PROC(proc, argtype, restype)				\
7566 [NFSPROC4_CLNT_##proc] = {					\
7567 	.p_proc   = NFSPROC4_COMPOUND,				\
7568 	.p_encode = nfs4_xdr_##argtype,				\
7569 	.p_decode = nfs4_xdr_##restype,				\
7570 	.p_arglen = NFS4_##argtype##_sz,			\
7571 	.p_replen = NFS4_##restype##_sz,			\
7572 	.p_statidx = NFSPROC4_CLNT_##proc,			\
7573 	.p_name   = #proc,					\
7574 }
7575 
7576 #define STUB(proc)		\
7577 [NFSPROC4_CLNT_##proc] = {	\
7578 	.p_name = #proc,	\
7579 }
7580 
7581 #if defined(CONFIG_NFS_V4_1)
7582 #define PROC41(proc, argtype, restype)				\
7583 	PROC(proc, argtype, restype)
7584 #else
7585 #define PROC41(proc, argtype, restype)				\
7586 	STUB(proc)
7587 #endif
7588 
7589 #if defined(CONFIG_NFS_V4_2)
7590 #define PROC42(proc, argtype, restype)				\
7591 	PROC(proc, argtype, restype)
7592 #else
7593 #define PROC42(proc, argtype, restype)				\
7594 	STUB(proc)
7595 #endif
7596 
7597 const struct rpc_procinfo nfs4_procedures[] = {
7598 	PROC(READ,		enc_read,		dec_read),
7599 	PROC(WRITE,		enc_write,		dec_write),
7600 	PROC(COMMIT,		enc_commit,		dec_commit),
7601 	PROC(OPEN,		enc_open,		dec_open),
7602 	PROC(OPEN_CONFIRM,	enc_open_confirm,	dec_open_confirm),
7603 	PROC(OPEN_NOATTR,	enc_open_noattr,	dec_open_noattr),
7604 	PROC(OPEN_DOWNGRADE,	enc_open_downgrade,	dec_open_downgrade),
7605 	PROC(CLOSE,		enc_close,		dec_close),
7606 	PROC(SETATTR,		enc_setattr,		dec_setattr),
7607 	PROC(FSINFO,		enc_fsinfo,		dec_fsinfo),
7608 	PROC(RENEW,		enc_renew,		dec_renew),
7609 	PROC(SETCLIENTID,	enc_setclientid,	dec_setclientid),
7610 	PROC(SETCLIENTID_CONFIRM, enc_setclientid_confirm, dec_setclientid_confirm),
7611 	PROC(LOCK,		enc_lock,		dec_lock),
7612 	PROC(LOCKT,		enc_lockt,		dec_lockt),
7613 	PROC(LOCKU,		enc_locku,		dec_locku),
7614 	PROC(ACCESS,		enc_access,		dec_access),
7615 	PROC(GETATTR,		enc_getattr,		dec_getattr),
7616 	PROC(LOOKUP,		enc_lookup,		dec_lookup),
7617 	PROC(LOOKUP_ROOT,	enc_lookup_root,	dec_lookup_root),
7618 	PROC(REMOVE,		enc_remove,		dec_remove),
7619 	PROC(RENAME,		enc_rename,		dec_rename),
7620 	PROC(LINK,		enc_link,		dec_link),
7621 	PROC(SYMLINK,		enc_symlink,		dec_symlink),
7622 	PROC(CREATE,		enc_create,		dec_create),
7623 	PROC(PATHCONF,		enc_pathconf,		dec_pathconf),
7624 	PROC(STATFS,		enc_statfs,		dec_statfs),
7625 	PROC(READLINK,		enc_readlink,		dec_readlink),
7626 	PROC(READDIR,		enc_readdir,		dec_readdir),
7627 	PROC(SERVER_CAPS,	enc_server_caps,	dec_server_caps),
7628 	PROC(DELEGRETURN,	enc_delegreturn,	dec_delegreturn),
7629 	PROC(GETACL,		enc_getacl,		dec_getacl),
7630 	PROC(SETACL,		enc_setacl,		dec_setacl),
7631 	PROC(FS_LOCATIONS,	enc_fs_locations,	dec_fs_locations),
7632 	PROC(RELEASE_LOCKOWNER,	enc_release_lockowner,	dec_release_lockowner),
7633 	PROC(SECINFO,		enc_secinfo,		dec_secinfo),
7634 	PROC(FSID_PRESENT,	enc_fsid_present,	dec_fsid_present),
7635 	PROC41(EXCHANGE_ID,	enc_exchange_id,	dec_exchange_id),
7636 	PROC41(CREATE_SESSION,	enc_create_session,	dec_create_session),
7637 	PROC41(DESTROY_SESSION,	enc_destroy_session,	dec_destroy_session),
7638 	PROC41(SEQUENCE,	enc_sequence,		dec_sequence),
7639 	PROC(GET_LEASE_TIME,	enc_get_lease_time,	dec_get_lease_time),
7640 	PROC41(RECLAIM_COMPLETE,enc_reclaim_complete,	dec_reclaim_complete),
7641 	PROC41(GETDEVICEINFO,	enc_getdeviceinfo,	dec_getdeviceinfo),
7642 	PROC41(LAYOUTGET,	enc_layoutget,		dec_layoutget),
7643 	PROC41(LAYOUTCOMMIT,	enc_layoutcommit,	dec_layoutcommit),
7644 	PROC41(LAYOUTRETURN,	enc_layoutreturn,	dec_layoutreturn),
7645 	PROC41(SECINFO_NO_NAME,	enc_secinfo_no_name,	dec_secinfo_no_name),
7646 	PROC41(TEST_STATEID,	enc_test_stateid,	dec_test_stateid),
7647 	PROC41(FREE_STATEID,	enc_free_stateid,	dec_free_stateid),
7648 	STUB(GETDEVICELIST),
7649 	PROC41(BIND_CONN_TO_SESSION,
7650 			enc_bind_conn_to_session, dec_bind_conn_to_session),
7651 	PROC41(DESTROY_CLIENTID,enc_destroy_clientid,	dec_destroy_clientid),
7652 	PROC42(SEEK,		enc_seek,		dec_seek),
7653 	PROC42(ALLOCATE,	enc_allocate,		dec_allocate),
7654 	PROC42(DEALLOCATE,	enc_deallocate,		dec_deallocate),
7655 	PROC42(LAYOUTSTATS,	enc_layoutstats,	dec_layoutstats),
7656 	PROC42(CLONE,		enc_clone,		dec_clone),
7657 	PROC42(COPY,		enc_copy,		dec_copy),
7658 	PROC42(OFFLOAD_CANCEL,	enc_offload_cancel,	dec_offload_cancel),
7659 	PROC42(COPY_NOTIFY,	enc_copy_notify,	dec_copy_notify),
7660 	PROC(LOOKUPP,		enc_lookupp,		dec_lookupp),
7661 	PROC42(LAYOUTERROR,	enc_layouterror,	dec_layouterror),
7662 	PROC42(GETXATTR,	enc_getxattr,		dec_getxattr),
7663 	PROC42(SETXATTR,	enc_setxattr,		dec_setxattr),
7664 	PROC42(LISTXATTRS,	enc_listxattrs,		dec_listxattrs),
7665 	PROC42(REMOVEXATTR,	enc_removexattr,	dec_removexattr),
7666 	PROC42(READ_PLUS,	enc_read_plus,		dec_read_plus),
7667 };
7668 
7669 static unsigned int nfs_version4_counts[ARRAY_SIZE(nfs4_procedures)];
7670 const struct rpc_version nfs_version4 = {
7671 	.number			= 4,
7672 	.nrprocs		= ARRAY_SIZE(nfs4_procedures),
7673 	.procs			= nfs4_procedures,
7674 	.counts			= nfs_version4_counts,
7675 };
7676