xref: /openbmc/linux/fs/nfs/nfs4xdr.c (revision fd589a8f)
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/slab.h>
42 #include <linux/utsname.h>
43 #include <linux/errno.h>
44 #include <linux/string.h>
45 #include <linux/in.h>
46 #include <linux/pagemap.h>
47 #include <linux/proc_fs.h>
48 #include <linux/kdev_t.h>
49 #include <linux/sunrpc/clnt.h>
50 #include <linux/nfs.h>
51 #include <linux/nfs4.h>
52 #include <linux/nfs_fs.h>
53 #include <linux/nfs_idmap.h>
54 #include "nfs4_fs.h"
55 
56 #define NFSDBG_FACILITY		NFSDBG_XDR
57 
58 /* Mapping from NFS error code to "errno" error code. */
59 #define errno_NFSERR_IO		EIO
60 
61 static int nfs4_stat_to_errno(int);
62 
63 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
64 #ifdef DEBUG
65 #define NFS4_MAXTAGLEN		20
66 #else
67 #define NFS4_MAXTAGLEN		0
68 #endif
69 
70 /* lock,open owner id:
71  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
72  */
73 #define open_owner_id_maxsz	(1 + 4)
74 #define lock_owner_id_maxsz	(1 + 4)
75 #define decode_lockowner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
76 #define compound_encode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
77 #define compound_decode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
78 #define op_encode_hdr_maxsz	(1)
79 #define op_decode_hdr_maxsz	(2)
80 #define encode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))
81 #define decode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))
82 #define encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
83 #define decode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
84 #define encode_putfh_maxsz	(op_encode_hdr_maxsz + 1 + \
85 				(NFS4_FHSIZE >> 2))
86 #define decode_putfh_maxsz	(op_decode_hdr_maxsz)
87 #define encode_putrootfh_maxsz	(op_encode_hdr_maxsz)
88 #define decode_putrootfh_maxsz	(op_decode_hdr_maxsz)
89 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
90 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
91 				((3+NFS4_FHSIZE) >> 2))
92 #define nfs4_fattr_bitmap_maxsz 3
93 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
94 #define nfs4_name_maxsz		(1 + ((3 + NFS4_MAXNAMLEN) >> 2))
95 #define nfs4_path_maxsz		(1 + ((3 + NFS4_MAXPATHLEN) >> 2))
96 #define nfs4_owner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
97 #define nfs4_group_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
98 /* This is based on getfattr, which uses the most attributes: */
99 #define nfs4_fattr_value_maxsz	(1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
100 				3 + 3 + 3 + nfs4_owner_maxsz + nfs4_group_maxsz))
101 #define nfs4_fattr_maxsz	(nfs4_fattr_bitmap_maxsz + \
102 				nfs4_fattr_value_maxsz)
103 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
104 #define encode_attrs_maxsz	(nfs4_fattr_bitmap_maxsz + \
105 				 1 + 2 + 1 + \
106 				nfs4_owner_maxsz + \
107 				nfs4_group_maxsz + \
108 				4 + 4)
109 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
110 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
111 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
112 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
113 #define encode_fsinfo_maxsz	(encode_getattr_maxsz)
114 #define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + 11)
115 #define encode_renew_maxsz	(op_encode_hdr_maxsz + 3)
116 #define decode_renew_maxsz	(op_decode_hdr_maxsz)
117 #define encode_setclientid_maxsz \
118 				(op_encode_hdr_maxsz + \
119 				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
120 				XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
121 				1 /* sc_prog */ + \
122 				XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
123 				XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
124 				1) /* sc_cb_ident */
125 #define decode_setclientid_maxsz \
126 				(op_decode_hdr_maxsz + \
127 				2 + \
128 				1024) /* large value for CLID_INUSE */
129 #define encode_setclientid_confirm_maxsz \
130 				(op_encode_hdr_maxsz + \
131 				3 + (NFS4_VERIFIER_SIZE >> 2))
132 #define decode_setclientid_confirm_maxsz \
133 				(op_decode_hdr_maxsz)
134 #define encode_lookup_maxsz	(op_encode_hdr_maxsz + nfs4_name_maxsz)
135 #define decode_lookup_maxsz	(op_decode_hdr_maxsz)
136 #define encode_share_access_maxsz \
137 				(2)
138 #define encode_createmode_maxsz	(1 + encode_attrs_maxsz)
139 #define encode_opentype_maxsz	(1 + encode_createmode_maxsz)
140 #define encode_claim_null_maxsz	(1 + nfs4_name_maxsz)
141 #define encode_open_maxsz	(op_encode_hdr_maxsz + \
142 				2 + encode_share_access_maxsz + 2 + \
143 				open_owner_id_maxsz + \
144 				encode_opentype_maxsz + \
145 				encode_claim_null_maxsz)
146 #define decode_ace_maxsz	(3 + nfs4_owner_maxsz)
147 #define decode_delegation_maxsz	(1 + decode_stateid_maxsz + 1 + \
148 				decode_ace_maxsz)
149 #define decode_change_info_maxsz	(5)
150 #define decode_open_maxsz	(op_decode_hdr_maxsz + \
151 				decode_stateid_maxsz + \
152 				decode_change_info_maxsz + 1 + \
153 				nfs4_fattr_bitmap_maxsz + \
154 				decode_delegation_maxsz)
155 #define encode_open_confirm_maxsz \
156 				(op_encode_hdr_maxsz + \
157 				 encode_stateid_maxsz + 1)
158 #define decode_open_confirm_maxsz \
159 				(op_decode_hdr_maxsz + \
160 				 decode_stateid_maxsz)
161 #define encode_open_downgrade_maxsz \
162 				(op_encode_hdr_maxsz + \
163 				 encode_stateid_maxsz + 1 + \
164 				 encode_share_access_maxsz)
165 #define decode_open_downgrade_maxsz \
166 				(op_decode_hdr_maxsz + \
167 				 decode_stateid_maxsz)
168 #define encode_close_maxsz	(op_encode_hdr_maxsz + \
169 				 1 + encode_stateid_maxsz)
170 #define decode_close_maxsz	(op_decode_hdr_maxsz + \
171 				 decode_stateid_maxsz)
172 #define encode_setattr_maxsz	(op_encode_hdr_maxsz + \
173 				 encode_stateid_maxsz + \
174 				 encode_attrs_maxsz)
175 #define decode_setattr_maxsz	(op_decode_hdr_maxsz + \
176 				 nfs4_fattr_bitmap_maxsz)
177 #define encode_read_maxsz	(op_encode_hdr_maxsz + \
178 				 encode_stateid_maxsz + 3)
179 #define decode_read_maxsz	(op_decode_hdr_maxsz + 2)
180 #define encode_readdir_maxsz	(op_encode_hdr_maxsz + \
181 				 2 + encode_verifier_maxsz + 5)
182 #define decode_readdir_maxsz	(op_decode_hdr_maxsz + \
183 				 decode_verifier_maxsz)
184 #define encode_readlink_maxsz	(op_encode_hdr_maxsz)
185 #define decode_readlink_maxsz	(op_decode_hdr_maxsz + 1)
186 #define encode_write_maxsz	(op_encode_hdr_maxsz + \
187 				 encode_stateid_maxsz + 4)
188 #define decode_write_maxsz	(op_decode_hdr_maxsz + \
189 				 2 + decode_verifier_maxsz)
190 #define encode_commit_maxsz	(op_encode_hdr_maxsz + 3)
191 #define decode_commit_maxsz	(op_decode_hdr_maxsz + \
192 				 decode_verifier_maxsz)
193 #define encode_remove_maxsz	(op_encode_hdr_maxsz + \
194 				nfs4_name_maxsz)
195 #define decode_remove_maxsz	(op_decode_hdr_maxsz + \
196 				 decode_change_info_maxsz)
197 #define encode_rename_maxsz	(op_encode_hdr_maxsz + \
198 				2 * nfs4_name_maxsz)
199 #define decode_rename_maxsz	(op_decode_hdr_maxsz + \
200 				 decode_change_info_maxsz + \
201 				 decode_change_info_maxsz)
202 #define encode_link_maxsz	(op_encode_hdr_maxsz + \
203 				nfs4_name_maxsz)
204 #define decode_link_maxsz	(op_decode_hdr_maxsz + decode_change_info_maxsz)
205 #define encode_lock_maxsz	(op_encode_hdr_maxsz + \
206 				 7 + \
207 				 1 + encode_stateid_maxsz + 8)
208 #define decode_lock_denied_maxsz \
209 				(8 + decode_lockowner_maxsz)
210 #define decode_lock_maxsz	(op_decode_hdr_maxsz + \
211 				 decode_lock_denied_maxsz)
212 #define encode_lockt_maxsz	(op_encode_hdr_maxsz + 12)
213 #define decode_lockt_maxsz	(op_decode_hdr_maxsz + \
214 				 decode_lock_denied_maxsz)
215 #define encode_locku_maxsz	(op_encode_hdr_maxsz + 3 + \
216 				 encode_stateid_maxsz + \
217 				 4)
218 #define decode_locku_maxsz	(op_decode_hdr_maxsz + \
219 				 decode_stateid_maxsz)
220 #define encode_access_maxsz	(op_encode_hdr_maxsz + 1)
221 #define decode_access_maxsz	(op_decode_hdr_maxsz + 2)
222 #define encode_symlink_maxsz	(op_encode_hdr_maxsz + \
223 				1 + nfs4_name_maxsz + \
224 				1 + \
225 				nfs4_fattr_maxsz)
226 #define decode_symlink_maxsz	(op_decode_hdr_maxsz + 8)
227 #define encode_create_maxsz	(op_encode_hdr_maxsz + \
228 				1 + 2 + nfs4_name_maxsz + \
229 				encode_attrs_maxsz)
230 #define decode_create_maxsz	(op_decode_hdr_maxsz + \
231 				decode_change_info_maxsz + \
232 				nfs4_fattr_bitmap_maxsz)
233 #define encode_statfs_maxsz	(encode_getattr_maxsz)
234 #define decode_statfs_maxsz	(decode_getattr_maxsz)
235 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
236 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
237 #define encode_getacl_maxsz	(encode_getattr_maxsz)
238 #define decode_getacl_maxsz	(op_decode_hdr_maxsz + \
239 				 nfs4_fattr_bitmap_maxsz + 1)
240 #define encode_setacl_maxsz	(op_encode_hdr_maxsz + \
241 				 encode_stateid_maxsz + 3)
242 #define decode_setacl_maxsz	(decode_setattr_maxsz)
243 #define encode_fs_locations_maxsz \
244 				(encode_getattr_maxsz)
245 #define decode_fs_locations_maxsz \
246 				(0)
247 
248 #if defined(CONFIG_NFS_V4_1)
249 #define NFS4_MAX_MACHINE_NAME_LEN (64)
250 
251 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
252 				encode_verifier_maxsz + \
253 				1 /* co_ownerid.len */ + \
254 				XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
255 				1 /* flags */ + \
256 				1 /* spa_how */ + \
257 				0 /* SP4_NONE (for now) */ + \
258 				1 /* zero implemetation id array */)
259 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
260 				2 /* eir_clientid */ + \
261 				1 /* eir_sequenceid */ + \
262 				1 /* eir_flags */ + \
263 				1 /* spr_how */ + \
264 				0 /* SP4_NONE (for now) */ + \
265 				2 /* eir_server_owner.so_minor_id */ + \
266 				/* eir_server_owner.so_major_id<> */ \
267 				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
268 				/* eir_server_scope<> */ \
269 				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
270 				1 /* eir_server_impl_id array length */ + \
271 				0 /* ignored eir_server_impl_id contents */)
272 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
273 #define decode_channel_attrs_maxsz  (6 + \
274 				     1 /* ca_rdma_ird.len */ + \
275 				     1 /* ca_rdma_ird */)
276 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
277 				     2 /* csa_clientid */ + \
278 				     1 /* csa_sequence */ + \
279 				     1 /* csa_flags */ + \
280 				     encode_channel_attrs_maxsz + \
281 				     encode_channel_attrs_maxsz + \
282 				     1 /* csa_cb_program */ + \
283 				     1 /* csa_sec_parms.len (1) */ + \
284 				     1 /* cb_secflavor (AUTH_SYS) */ + \
285 				     1 /* stamp */ + \
286 				     1 /* machinename.len */ + \
287 				     XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
288 				     1 /* uid */ + \
289 				     1 /* gid */ + \
290 				     1 /* gids.len (0) */)
291 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +	\
292 				     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
293 				     1 /* csr_sequence */ + \
294 				     1 /* csr_flags */ + \
295 				     decode_channel_attrs_maxsz + \
296 				     decode_channel_attrs_maxsz)
297 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
298 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
299 #define encode_sequence_maxsz	(op_encode_hdr_maxsz + \
300 				XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
301 #define decode_sequence_maxsz	(op_decode_hdr_maxsz + \
302 				XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
303 #else /* CONFIG_NFS_V4_1 */
304 #define encode_sequence_maxsz	0
305 #define decode_sequence_maxsz	0
306 #endif /* CONFIG_NFS_V4_1 */
307 
308 #define NFS4_enc_compound_sz	(1024)  /* XXX: large enough? */
309 #define NFS4_dec_compound_sz	(1024)  /* XXX: large enough? */
310 #define NFS4_enc_read_sz	(compound_encode_hdr_maxsz + \
311 				encode_sequence_maxsz + \
312 				encode_putfh_maxsz + \
313 				encode_read_maxsz)
314 #define NFS4_dec_read_sz	(compound_decode_hdr_maxsz + \
315 				decode_sequence_maxsz + \
316 				decode_putfh_maxsz + \
317 				decode_read_maxsz)
318 #define NFS4_enc_readlink_sz	(compound_encode_hdr_maxsz + \
319 				encode_sequence_maxsz + \
320 				encode_putfh_maxsz + \
321 				encode_readlink_maxsz)
322 #define NFS4_dec_readlink_sz	(compound_decode_hdr_maxsz + \
323 				decode_sequence_maxsz + \
324 				decode_putfh_maxsz + \
325 				decode_readlink_maxsz)
326 #define NFS4_enc_readdir_sz	(compound_encode_hdr_maxsz + \
327 				encode_sequence_maxsz + \
328 				encode_putfh_maxsz + \
329 				encode_readdir_maxsz)
330 #define NFS4_dec_readdir_sz	(compound_decode_hdr_maxsz + \
331 				decode_sequence_maxsz + \
332 				decode_putfh_maxsz + \
333 				decode_readdir_maxsz)
334 #define NFS4_enc_write_sz	(compound_encode_hdr_maxsz + \
335 				encode_sequence_maxsz + \
336 				encode_putfh_maxsz + \
337 				encode_write_maxsz + \
338 				encode_getattr_maxsz)
339 #define NFS4_dec_write_sz	(compound_decode_hdr_maxsz + \
340 				decode_sequence_maxsz + \
341 				decode_putfh_maxsz + \
342 				decode_write_maxsz + \
343 				decode_getattr_maxsz)
344 #define NFS4_enc_commit_sz	(compound_encode_hdr_maxsz + \
345 				encode_sequence_maxsz + \
346 				encode_putfh_maxsz + \
347 				encode_commit_maxsz + \
348 				encode_getattr_maxsz)
349 #define NFS4_dec_commit_sz	(compound_decode_hdr_maxsz + \
350 				decode_sequence_maxsz + \
351 				decode_putfh_maxsz + \
352 				decode_commit_maxsz + \
353 				decode_getattr_maxsz)
354 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
355 				encode_sequence_maxsz + \
356 				encode_putfh_maxsz + \
357 				encode_savefh_maxsz + \
358 				encode_open_maxsz + \
359 				encode_getfh_maxsz + \
360 				encode_getattr_maxsz + \
361 				encode_restorefh_maxsz + \
362 				encode_getattr_maxsz)
363 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
364 				decode_sequence_maxsz + \
365 				decode_putfh_maxsz + \
366 				decode_savefh_maxsz + \
367 				decode_open_maxsz + \
368 				decode_getfh_maxsz + \
369 				decode_getattr_maxsz + \
370 				decode_restorefh_maxsz + \
371 				decode_getattr_maxsz)
372 #define NFS4_enc_open_confirm_sz \
373 				(compound_encode_hdr_maxsz + \
374 				 encode_putfh_maxsz + \
375 				 encode_open_confirm_maxsz)
376 #define NFS4_dec_open_confirm_sz \
377 				(compound_decode_hdr_maxsz + \
378 				 decode_putfh_maxsz + \
379 				 decode_open_confirm_maxsz)
380 #define NFS4_enc_open_noattr_sz	(compound_encode_hdr_maxsz + \
381 					encode_sequence_maxsz + \
382 					encode_putfh_maxsz + \
383 					encode_open_maxsz + \
384 					encode_getattr_maxsz)
385 #define NFS4_dec_open_noattr_sz	(compound_decode_hdr_maxsz + \
386 					decode_sequence_maxsz + \
387 					decode_putfh_maxsz + \
388 					decode_open_maxsz + \
389 					decode_getattr_maxsz)
390 #define NFS4_enc_open_downgrade_sz \
391 				(compound_encode_hdr_maxsz + \
392 				 encode_sequence_maxsz + \
393 				 encode_putfh_maxsz + \
394 				 encode_open_downgrade_maxsz + \
395 				 encode_getattr_maxsz)
396 #define NFS4_dec_open_downgrade_sz \
397 				(compound_decode_hdr_maxsz + \
398 				 decode_sequence_maxsz + \
399 				 decode_putfh_maxsz + \
400 				 decode_open_downgrade_maxsz + \
401 				 decode_getattr_maxsz)
402 #define NFS4_enc_close_sz	(compound_encode_hdr_maxsz + \
403 				 encode_sequence_maxsz + \
404 				 encode_putfh_maxsz + \
405 				 encode_close_maxsz + \
406 				 encode_getattr_maxsz)
407 #define NFS4_dec_close_sz	(compound_decode_hdr_maxsz + \
408 				 decode_sequence_maxsz + \
409 				 decode_putfh_maxsz + \
410 				 decode_close_maxsz + \
411 				 decode_getattr_maxsz)
412 #define NFS4_enc_setattr_sz	(compound_encode_hdr_maxsz + \
413 				 encode_sequence_maxsz + \
414 				 encode_putfh_maxsz + \
415 				 encode_setattr_maxsz + \
416 				 encode_getattr_maxsz)
417 #define NFS4_dec_setattr_sz	(compound_decode_hdr_maxsz + \
418 				 decode_sequence_maxsz + \
419 				 decode_putfh_maxsz + \
420 				 decode_setattr_maxsz + \
421 				 decode_getattr_maxsz)
422 #define NFS4_enc_fsinfo_sz	(compound_encode_hdr_maxsz + \
423 				encode_sequence_maxsz + \
424 				encode_putfh_maxsz + \
425 				encode_fsinfo_maxsz)
426 #define NFS4_dec_fsinfo_sz	(compound_decode_hdr_maxsz + \
427 				decode_sequence_maxsz + \
428 				decode_putfh_maxsz + \
429 				decode_fsinfo_maxsz)
430 #define NFS4_enc_renew_sz	(compound_encode_hdr_maxsz + \
431 				encode_renew_maxsz)
432 #define NFS4_dec_renew_sz	(compound_decode_hdr_maxsz + \
433 				decode_renew_maxsz)
434 #define NFS4_enc_setclientid_sz	(compound_encode_hdr_maxsz + \
435 				encode_setclientid_maxsz)
436 #define NFS4_dec_setclientid_sz	(compound_decode_hdr_maxsz + \
437 				decode_setclientid_maxsz)
438 #define NFS4_enc_setclientid_confirm_sz \
439 				(compound_encode_hdr_maxsz + \
440 				encode_setclientid_confirm_maxsz + \
441 				encode_putrootfh_maxsz + \
442 				encode_fsinfo_maxsz)
443 #define NFS4_dec_setclientid_confirm_sz \
444 				(compound_decode_hdr_maxsz + \
445 				decode_setclientid_confirm_maxsz + \
446 				decode_putrootfh_maxsz + \
447 				decode_fsinfo_maxsz)
448 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
449 				encode_sequence_maxsz + \
450 				encode_putfh_maxsz + \
451 				encode_lock_maxsz)
452 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
453 				decode_sequence_maxsz + \
454 				decode_putfh_maxsz + \
455 				decode_lock_maxsz)
456 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
457 				encode_sequence_maxsz + \
458 				encode_putfh_maxsz + \
459 				encode_lockt_maxsz)
460 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
461 				 decode_sequence_maxsz + \
462 				 decode_putfh_maxsz + \
463 				 decode_lockt_maxsz)
464 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
465 				encode_sequence_maxsz + \
466 				encode_putfh_maxsz + \
467 				encode_locku_maxsz)
468 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
469 				decode_sequence_maxsz + \
470 				decode_putfh_maxsz + \
471 				decode_locku_maxsz)
472 #define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
473 				encode_sequence_maxsz + \
474 				encode_putfh_maxsz + \
475 				encode_access_maxsz + \
476 				encode_getattr_maxsz)
477 #define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
478 				decode_sequence_maxsz + \
479 				decode_putfh_maxsz + \
480 				decode_access_maxsz + \
481 				decode_getattr_maxsz)
482 #define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
483 				encode_sequence_maxsz + \
484 				encode_putfh_maxsz + \
485 				encode_getattr_maxsz)
486 #define NFS4_dec_getattr_sz	(compound_decode_hdr_maxsz + \
487 				decode_sequence_maxsz + \
488 				decode_putfh_maxsz + \
489 				decode_getattr_maxsz)
490 #define NFS4_enc_lookup_sz	(compound_encode_hdr_maxsz + \
491 				encode_sequence_maxsz + \
492 				encode_putfh_maxsz + \
493 				encode_lookup_maxsz + \
494 				encode_getattr_maxsz + \
495 				encode_getfh_maxsz)
496 #define NFS4_dec_lookup_sz	(compound_decode_hdr_maxsz + \
497 				decode_sequence_maxsz + \
498 				decode_putfh_maxsz + \
499 				decode_lookup_maxsz + \
500 				decode_getattr_maxsz + \
501 				decode_getfh_maxsz)
502 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
503 				encode_sequence_maxsz + \
504 				encode_putrootfh_maxsz + \
505 				encode_getattr_maxsz + \
506 				encode_getfh_maxsz)
507 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
508 				decode_sequence_maxsz + \
509 				decode_putrootfh_maxsz + \
510 				decode_getattr_maxsz + \
511 				decode_getfh_maxsz)
512 #define NFS4_enc_remove_sz	(compound_encode_hdr_maxsz + \
513 				encode_sequence_maxsz + \
514 				encode_putfh_maxsz + \
515 				encode_remove_maxsz + \
516 				encode_getattr_maxsz)
517 #define NFS4_dec_remove_sz	(compound_decode_hdr_maxsz + \
518 				decode_sequence_maxsz + \
519 				decode_putfh_maxsz + \
520 				decode_remove_maxsz + \
521 				decode_getattr_maxsz)
522 #define NFS4_enc_rename_sz	(compound_encode_hdr_maxsz + \
523 				encode_sequence_maxsz + \
524 				encode_putfh_maxsz + \
525 				encode_savefh_maxsz + \
526 				encode_putfh_maxsz + \
527 				encode_rename_maxsz + \
528 				encode_getattr_maxsz + \
529 				encode_restorefh_maxsz + \
530 				encode_getattr_maxsz)
531 #define NFS4_dec_rename_sz	(compound_decode_hdr_maxsz + \
532 				decode_sequence_maxsz + \
533 				decode_putfh_maxsz + \
534 				decode_savefh_maxsz + \
535 				decode_putfh_maxsz + \
536 				decode_rename_maxsz + \
537 				decode_getattr_maxsz + \
538 				decode_restorefh_maxsz + \
539 				decode_getattr_maxsz)
540 #define NFS4_enc_link_sz	(compound_encode_hdr_maxsz + \
541 				encode_sequence_maxsz + \
542 				encode_putfh_maxsz + \
543 				encode_savefh_maxsz + \
544 				encode_putfh_maxsz + \
545 				encode_link_maxsz + \
546 				decode_getattr_maxsz + \
547 				encode_restorefh_maxsz + \
548 				decode_getattr_maxsz)
549 #define NFS4_dec_link_sz	(compound_decode_hdr_maxsz + \
550 				decode_sequence_maxsz + \
551 				decode_putfh_maxsz + \
552 				decode_savefh_maxsz + \
553 				decode_putfh_maxsz + \
554 				decode_link_maxsz + \
555 				decode_getattr_maxsz + \
556 				decode_restorefh_maxsz + \
557 				decode_getattr_maxsz)
558 #define NFS4_enc_symlink_sz	(compound_encode_hdr_maxsz + \
559 				encode_sequence_maxsz + \
560 				encode_putfh_maxsz + \
561 				encode_symlink_maxsz + \
562 				encode_getattr_maxsz + \
563 				encode_getfh_maxsz)
564 #define NFS4_dec_symlink_sz	(compound_decode_hdr_maxsz + \
565 				decode_sequence_maxsz + \
566 				decode_putfh_maxsz + \
567 				decode_symlink_maxsz + \
568 				decode_getattr_maxsz + \
569 				decode_getfh_maxsz)
570 #define NFS4_enc_create_sz	(compound_encode_hdr_maxsz + \
571 				encode_sequence_maxsz + \
572 				encode_putfh_maxsz + \
573 				encode_savefh_maxsz + \
574 				encode_create_maxsz + \
575 				encode_getfh_maxsz + \
576 				encode_getattr_maxsz + \
577 				encode_restorefh_maxsz + \
578 				encode_getattr_maxsz)
579 #define NFS4_dec_create_sz	(compound_decode_hdr_maxsz + \
580 				decode_sequence_maxsz + \
581 				decode_putfh_maxsz + \
582 				decode_savefh_maxsz + \
583 				decode_create_maxsz + \
584 				decode_getfh_maxsz + \
585 				decode_getattr_maxsz + \
586 				decode_restorefh_maxsz + \
587 				decode_getattr_maxsz)
588 #define NFS4_enc_pathconf_sz	(compound_encode_hdr_maxsz + \
589 				encode_sequence_maxsz + \
590 				encode_putfh_maxsz + \
591 				encode_getattr_maxsz)
592 #define NFS4_dec_pathconf_sz	(compound_decode_hdr_maxsz + \
593 				decode_sequence_maxsz + \
594 				decode_putfh_maxsz + \
595 				decode_getattr_maxsz)
596 #define NFS4_enc_statfs_sz	(compound_encode_hdr_maxsz + \
597 				encode_sequence_maxsz + \
598 				encode_putfh_maxsz + \
599 				encode_statfs_maxsz)
600 #define NFS4_dec_statfs_sz	(compound_decode_hdr_maxsz + \
601 				decode_sequence_maxsz + \
602 				decode_putfh_maxsz + \
603 				decode_statfs_maxsz)
604 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
605 				encode_sequence_maxsz + \
606 				encode_putfh_maxsz + \
607 				encode_getattr_maxsz)
608 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
609 				decode_sequence_maxsz + \
610 				decode_putfh_maxsz + \
611 				decode_getattr_maxsz)
612 #define NFS4_enc_delegreturn_sz	(compound_encode_hdr_maxsz + \
613 				encode_sequence_maxsz + \
614 				encode_putfh_maxsz + \
615 				encode_delegreturn_maxsz + \
616 				encode_getattr_maxsz)
617 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
618 				decode_sequence_maxsz + \
619 				decode_delegreturn_maxsz + \
620 				decode_getattr_maxsz)
621 #define NFS4_enc_getacl_sz	(compound_encode_hdr_maxsz + \
622 				encode_sequence_maxsz + \
623 				encode_putfh_maxsz + \
624 				encode_getacl_maxsz)
625 #define NFS4_dec_getacl_sz	(compound_decode_hdr_maxsz + \
626 				decode_sequence_maxsz + \
627 				decode_putfh_maxsz + \
628 				decode_getacl_maxsz)
629 #define NFS4_enc_setacl_sz	(compound_encode_hdr_maxsz + \
630 				encode_sequence_maxsz + \
631 				encode_putfh_maxsz + \
632 				encode_setacl_maxsz)
633 #define NFS4_dec_setacl_sz	(compound_decode_hdr_maxsz + \
634 				decode_sequence_maxsz + \
635 				decode_putfh_maxsz + \
636 				decode_setacl_maxsz)
637 #define NFS4_enc_fs_locations_sz \
638 				(compound_encode_hdr_maxsz + \
639 				 encode_sequence_maxsz + \
640 				 encode_putfh_maxsz + \
641 				 encode_lookup_maxsz + \
642 				 encode_fs_locations_maxsz)
643 #define NFS4_dec_fs_locations_sz \
644 				(compound_decode_hdr_maxsz + \
645 				 decode_sequence_maxsz + \
646 				 decode_putfh_maxsz + \
647 				 decode_lookup_maxsz + \
648 				 decode_fs_locations_maxsz)
649 #if defined(CONFIG_NFS_V4_1)
650 #define NFS4_enc_exchange_id_sz \
651 				(compound_encode_hdr_maxsz + \
652 				 encode_exchange_id_maxsz)
653 #define NFS4_dec_exchange_id_sz \
654 				(compound_decode_hdr_maxsz + \
655 				 decode_exchange_id_maxsz)
656 #define NFS4_enc_create_session_sz \
657 				(compound_encode_hdr_maxsz + \
658 				 encode_create_session_maxsz)
659 #define NFS4_dec_create_session_sz \
660 				(compound_decode_hdr_maxsz + \
661 				 decode_create_session_maxsz)
662 #define NFS4_enc_destroy_session_sz	(compound_encode_hdr_maxsz + \
663 					 encode_destroy_session_maxsz)
664 #define NFS4_dec_destroy_session_sz	(compound_decode_hdr_maxsz + \
665 					 decode_destroy_session_maxsz)
666 #define NFS4_enc_sequence_sz \
667 				(compound_decode_hdr_maxsz + \
668 				 encode_sequence_maxsz)
669 #define NFS4_dec_sequence_sz \
670 				(compound_decode_hdr_maxsz + \
671 				 decode_sequence_maxsz)
672 #define NFS4_enc_get_lease_time_sz	(compound_encode_hdr_maxsz + \
673 					 encode_sequence_maxsz + \
674 					 encode_putrootfh_maxsz + \
675 					 encode_fsinfo_maxsz)
676 #define NFS4_dec_get_lease_time_sz	(compound_decode_hdr_maxsz + \
677 					 decode_sequence_maxsz + \
678 					 decode_putrootfh_maxsz + \
679 					 decode_fsinfo_maxsz)
680 #endif /* CONFIG_NFS_V4_1 */
681 
682 static const umode_t nfs_type2fmt[] = {
683 	[NF4BAD] = 0,
684 	[NF4REG] = S_IFREG,
685 	[NF4DIR] = S_IFDIR,
686 	[NF4BLK] = S_IFBLK,
687 	[NF4CHR] = S_IFCHR,
688 	[NF4LNK] = S_IFLNK,
689 	[NF4SOCK] = S_IFSOCK,
690 	[NF4FIFO] = S_IFIFO,
691 	[NF4ATTRDIR] = 0,
692 	[NF4NAMEDATTR] = 0,
693 };
694 
695 struct compound_hdr {
696 	int32_t		status;
697 	uint32_t	nops;
698 	__be32 *	nops_p;
699 	uint32_t	taglen;
700 	char *		tag;
701 	uint32_t	replen;		/* expected reply words */
702 	u32		minorversion;
703 };
704 
705 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
706 {
707 	__be32 *p = xdr_reserve_space(xdr, nbytes);
708 	BUG_ON(!p);
709 	return p;
710 }
711 
712 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
713 {
714 	__be32 *p;
715 
716 	p = xdr_reserve_space(xdr, 4 + len);
717 	BUG_ON(p == NULL);
718 	xdr_encode_opaque(p, str, len);
719 }
720 
721 static void encode_compound_hdr(struct xdr_stream *xdr,
722 				struct rpc_rqst *req,
723 				struct compound_hdr *hdr)
724 {
725 	__be32 *p;
726 	struct rpc_auth *auth = req->rq_task->tk_msg.rpc_cred->cr_auth;
727 
728 	/* initialize running count of expected bytes in reply.
729 	 * NOTE: the replied tag SHOULD be the same is the one sent,
730 	 * but this is not required as a MUST for the server to do so. */
731 	hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
732 
733 	dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
734 	BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
735 	p = reserve_space(xdr, 4 + hdr->taglen + 8);
736 	p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);
737 	*p++ = cpu_to_be32(hdr->minorversion);
738 	hdr->nops_p = p;
739 	*p = cpu_to_be32(hdr->nops);
740 }
741 
742 static void encode_nops(struct compound_hdr *hdr)
743 {
744 	BUG_ON(hdr->nops > NFS4_MAX_OPS);
745 	*hdr->nops_p = htonl(hdr->nops);
746 }
747 
748 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
749 {
750 	__be32 *p;
751 
752 	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
753 	BUG_ON(p == NULL);
754 	xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
755 }
756 
757 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
758 {
759 	char owner_name[IDMAP_NAMESZ];
760 	char owner_group[IDMAP_NAMESZ];
761 	int owner_namelen = 0;
762 	int owner_grouplen = 0;
763 	__be32 *p;
764 	__be32 *q;
765 	int len;
766 	uint32_t bmval0 = 0;
767 	uint32_t bmval1 = 0;
768 
769 	/*
770 	 * We reserve enough space to write the entire attribute buffer at once.
771 	 * In the worst-case, this would be
772 	 *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
773 	 *          = 36 bytes, plus any contribution from variable-length fields
774 	 *            such as owner/group.
775 	 */
776 	len = 16;
777 
778 	/* Sigh */
779 	if (iap->ia_valid & ATTR_SIZE)
780 		len += 8;
781 	if (iap->ia_valid & ATTR_MODE)
782 		len += 4;
783 	if (iap->ia_valid & ATTR_UID) {
784 		owner_namelen = nfs_map_uid_to_name(server->nfs_client, iap->ia_uid, owner_name);
785 		if (owner_namelen < 0) {
786 			dprintk("nfs: couldn't resolve uid %d to string\n",
787 					iap->ia_uid);
788 			/* XXX */
789 			strcpy(owner_name, "nobody");
790 			owner_namelen = sizeof("nobody") - 1;
791 			/* goto out; */
792 		}
793 		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
794 	}
795 	if (iap->ia_valid & ATTR_GID) {
796 		owner_grouplen = nfs_map_gid_to_group(server->nfs_client, iap->ia_gid, owner_group);
797 		if (owner_grouplen < 0) {
798 			dprintk("nfs: couldn't resolve gid %d to string\n",
799 					iap->ia_gid);
800 			strcpy(owner_group, "nobody");
801 			owner_grouplen = sizeof("nobody") - 1;
802 			/* goto out; */
803 		}
804 		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
805 	}
806 	if (iap->ia_valid & ATTR_ATIME_SET)
807 		len += 16;
808 	else if (iap->ia_valid & ATTR_ATIME)
809 		len += 4;
810 	if (iap->ia_valid & ATTR_MTIME_SET)
811 		len += 16;
812 	else if (iap->ia_valid & ATTR_MTIME)
813 		len += 4;
814 	p = reserve_space(xdr, len);
815 
816 	/*
817 	 * We write the bitmap length now, but leave the bitmap and the attribute
818 	 * buffer length to be backfilled at the end of this routine.
819 	 */
820 	*p++ = cpu_to_be32(2);
821 	q = p;
822 	p += 3;
823 
824 	if (iap->ia_valid & ATTR_SIZE) {
825 		bmval0 |= FATTR4_WORD0_SIZE;
826 		p = xdr_encode_hyper(p, iap->ia_size);
827 	}
828 	if (iap->ia_valid & ATTR_MODE) {
829 		bmval1 |= FATTR4_WORD1_MODE;
830 		*p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
831 	}
832 	if (iap->ia_valid & ATTR_UID) {
833 		bmval1 |= FATTR4_WORD1_OWNER;
834 		p = xdr_encode_opaque(p, owner_name, owner_namelen);
835 	}
836 	if (iap->ia_valid & ATTR_GID) {
837 		bmval1 |= FATTR4_WORD1_OWNER_GROUP;
838 		p = xdr_encode_opaque(p, owner_group, owner_grouplen);
839 	}
840 	if (iap->ia_valid & ATTR_ATIME_SET) {
841 		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
842 		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
843 		*p++ = cpu_to_be32(0);
844 		*p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
845 		*p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
846 	}
847 	else if (iap->ia_valid & ATTR_ATIME) {
848 		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
849 		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
850 	}
851 	if (iap->ia_valid & ATTR_MTIME_SET) {
852 		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
853 		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
854 		*p++ = cpu_to_be32(0);
855 		*p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
856 		*p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
857 	}
858 	else if (iap->ia_valid & ATTR_MTIME) {
859 		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
860 		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
861 	}
862 
863 	/*
864 	 * Now we backfill the bitmap and the attribute buffer length.
865 	 */
866 	if (len != ((char *)p - (char *)q) + 4) {
867 		printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
868 				len, ((char *)p - (char *)q) + 4);
869 		BUG();
870 	}
871 	len = (char *)p - (char *)q - 12;
872 	*q++ = htonl(bmval0);
873 	*q++ = htonl(bmval1);
874 	*q = htonl(len);
875 
876 /* out: */
877 }
878 
879 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
880 {
881 	__be32 *p;
882 
883 	p = reserve_space(xdr, 8);
884 	*p++ = cpu_to_be32(OP_ACCESS);
885 	*p = cpu_to_be32(access);
886 	hdr->nops++;
887 	hdr->replen += decode_access_maxsz;
888 }
889 
890 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
891 {
892 	__be32 *p;
893 
894 	p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
895 	*p++ = cpu_to_be32(OP_CLOSE);
896 	*p++ = cpu_to_be32(arg->seqid->sequence->counter);
897 	xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
898 	hdr->nops++;
899 	hdr->replen += decode_close_maxsz;
900 }
901 
902 static void encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
903 {
904 	__be32 *p;
905 
906 	p = reserve_space(xdr, 16);
907 	*p++ = cpu_to_be32(OP_COMMIT);
908 	p = xdr_encode_hyper(p, args->offset);
909 	*p = cpu_to_be32(args->count);
910 	hdr->nops++;
911 	hdr->replen += decode_commit_maxsz;
912 }
913 
914 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
915 {
916 	__be32 *p;
917 
918 	p = reserve_space(xdr, 8);
919 	*p++ = cpu_to_be32(OP_CREATE);
920 	*p = cpu_to_be32(create->ftype);
921 
922 	switch (create->ftype) {
923 	case NF4LNK:
924 		p = reserve_space(xdr, 4);
925 		*p = cpu_to_be32(create->u.symlink.len);
926 		xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
927 		break;
928 
929 	case NF4BLK: case NF4CHR:
930 		p = reserve_space(xdr, 8);
931 		*p++ = cpu_to_be32(create->u.device.specdata1);
932 		*p = cpu_to_be32(create->u.device.specdata2);
933 		break;
934 
935 	default:
936 		break;
937 	}
938 
939 	encode_string(xdr, create->name->len, create->name->name);
940 	hdr->nops++;
941 	hdr->replen += decode_create_maxsz;
942 
943 	encode_attrs(xdr, create->attrs, create->server);
944 }
945 
946 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
947 {
948 	__be32 *p;
949 
950 	p = reserve_space(xdr, 12);
951 	*p++ = cpu_to_be32(OP_GETATTR);
952 	*p++ = cpu_to_be32(1);
953 	*p = cpu_to_be32(bitmap);
954 	hdr->nops++;
955 	hdr->replen += decode_getattr_maxsz;
956 }
957 
958 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
959 {
960 	__be32 *p;
961 
962 	p = reserve_space(xdr, 16);
963 	*p++ = cpu_to_be32(OP_GETATTR);
964 	*p++ = cpu_to_be32(2);
965 	*p++ = cpu_to_be32(bm0);
966 	*p = cpu_to_be32(bm1);
967 	hdr->nops++;
968 	hdr->replen += decode_getattr_maxsz;
969 }
970 
971 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
972 {
973 	encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
974 			   bitmask[1] & nfs4_fattr_bitmap[1], hdr);
975 }
976 
977 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
978 {
979 	encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],
980 			   bitmask[1] & nfs4_fsinfo_bitmap[1], hdr);
981 }
982 
983 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
984 {
985 	encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
986 			   bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
987 }
988 
989 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
990 {
991 	__be32 *p;
992 
993 	p = reserve_space(xdr, 4);
994 	*p = cpu_to_be32(OP_GETFH);
995 	hdr->nops++;
996 	hdr->replen += decode_getfh_maxsz;
997 }
998 
999 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1000 {
1001 	__be32 *p;
1002 
1003 	p = reserve_space(xdr, 8 + name->len);
1004 	*p++ = cpu_to_be32(OP_LINK);
1005 	xdr_encode_opaque(p, name->name, name->len);
1006 	hdr->nops++;
1007 	hdr->replen += decode_link_maxsz;
1008 }
1009 
1010 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1011 {
1012 	if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
1013 		return block ? NFS4_READW_LT : NFS4_READ_LT;
1014 	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1015 }
1016 
1017 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1018 {
1019 	if (fl->fl_end == OFFSET_MAX)
1020 		return ~(uint64_t)0;
1021 	return fl->fl_end - fl->fl_start + 1;
1022 }
1023 
1024 /*
1025  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1026  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1027  */
1028 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1029 {
1030 	__be32 *p;
1031 
1032 	p = reserve_space(xdr, 32);
1033 	*p++ = cpu_to_be32(OP_LOCK);
1034 	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1035 	*p++ = cpu_to_be32(args->reclaim);
1036 	p = xdr_encode_hyper(p, args->fl->fl_start);
1037 	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1038 	*p = cpu_to_be32(args->new_lock_owner);
1039 	if (args->new_lock_owner){
1040 		p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+32);
1041 		*p++ = cpu_to_be32(args->open_seqid->sequence->counter);
1042 		p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
1043 		*p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
1044 		p = xdr_encode_hyper(p, args->lock_owner.clientid);
1045 		*p++ = cpu_to_be32(16);
1046 		p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1047 		xdr_encode_hyper(p, args->lock_owner.id);
1048 	}
1049 	else {
1050 		p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
1051 		p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
1052 		*p = cpu_to_be32(args->lock_seqid->sequence->counter);
1053 	}
1054 	hdr->nops++;
1055 	hdr->replen += decode_lock_maxsz;
1056 }
1057 
1058 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1059 {
1060 	__be32 *p;
1061 
1062 	p = reserve_space(xdr, 52);
1063 	*p++ = cpu_to_be32(OP_LOCKT);
1064 	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1065 	p = xdr_encode_hyper(p, args->fl->fl_start);
1066 	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1067 	p = xdr_encode_hyper(p, args->lock_owner.clientid);
1068 	*p++ = cpu_to_be32(16);
1069 	p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1070 	xdr_encode_hyper(p, args->lock_owner.id);
1071 	hdr->nops++;
1072 	hdr->replen += decode_lockt_maxsz;
1073 }
1074 
1075 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1076 {
1077 	__be32 *p;
1078 
1079 	p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
1080 	*p++ = cpu_to_be32(OP_LOCKU);
1081 	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1082 	*p++ = cpu_to_be32(args->seqid->sequence->counter);
1083 	p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
1084 	p = xdr_encode_hyper(p, args->fl->fl_start);
1085 	xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1086 	hdr->nops++;
1087 	hdr->replen += decode_locku_maxsz;
1088 }
1089 
1090 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1091 {
1092 	int len = name->len;
1093 	__be32 *p;
1094 
1095 	p = reserve_space(xdr, 8 + len);
1096 	*p++ = cpu_to_be32(OP_LOOKUP);
1097 	xdr_encode_opaque(p, name->name, len);
1098 	hdr->nops++;
1099 	hdr->replen += decode_lookup_maxsz;
1100 }
1101 
1102 static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
1103 {
1104 	__be32 *p;
1105 
1106 	p = reserve_space(xdr, 8);
1107 	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1108 	case FMODE_READ:
1109 		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
1110 		break;
1111 	case FMODE_WRITE:
1112 		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
1113 		break;
1114 	case FMODE_READ|FMODE_WRITE:
1115 		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
1116 		break;
1117 	default:
1118 		*p++ = cpu_to_be32(0);
1119 	}
1120 	*p = cpu_to_be32(0);		/* for linux, share_deny = 0 always */
1121 }
1122 
1123 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1124 {
1125 	__be32 *p;
1126  /*
1127  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1128  * owner 4 = 32
1129  */
1130 	p = reserve_space(xdr, 8);
1131 	*p++ = cpu_to_be32(OP_OPEN);
1132 	*p = cpu_to_be32(arg->seqid->sequence->counter);
1133 	encode_share_access(xdr, arg->fmode);
1134 	p = reserve_space(xdr, 28);
1135 	p = xdr_encode_hyper(p, arg->clientid);
1136 	*p++ = cpu_to_be32(16);
1137 	p = xdr_encode_opaque_fixed(p, "open id:", 8);
1138 	xdr_encode_hyper(p, arg->id);
1139 }
1140 
1141 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1142 {
1143 	__be32 *p;
1144 
1145 	p = reserve_space(xdr, 4);
1146 	switch(arg->open_flags & O_EXCL) {
1147 	case 0:
1148 		*p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1149 		encode_attrs(xdr, arg->u.attrs, arg->server);
1150 		break;
1151 	default:
1152 		*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1153 		encode_nfs4_verifier(xdr, &arg->u.verifier);
1154 	}
1155 }
1156 
1157 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1158 {
1159 	__be32 *p;
1160 
1161 	p = reserve_space(xdr, 4);
1162 	switch (arg->open_flags & O_CREAT) {
1163 	case 0:
1164 		*p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1165 		break;
1166 	default:
1167 		BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
1168 		*p = cpu_to_be32(NFS4_OPEN_CREATE);
1169 		encode_createmode(xdr, arg);
1170 	}
1171 }
1172 
1173 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1174 {
1175 	__be32 *p;
1176 
1177 	p = reserve_space(xdr, 4);
1178 	switch (delegation_type) {
1179 	case 0:
1180 		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1181 		break;
1182 	case FMODE_READ:
1183 		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1184 		break;
1185 	case FMODE_WRITE|FMODE_READ:
1186 		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1187 		break;
1188 	default:
1189 		BUG();
1190 	}
1191 }
1192 
1193 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1194 {
1195 	__be32 *p;
1196 
1197 	p = reserve_space(xdr, 4);
1198 	*p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1199 	encode_string(xdr, name->len, name->name);
1200 }
1201 
1202 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1203 {
1204 	__be32 *p;
1205 
1206 	p = reserve_space(xdr, 4);
1207 	*p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1208 	encode_delegation_type(xdr, type);
1209 }
1210 
1211 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1212 {
1213 	__be32 *p;
1214 
1215 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1216 	*p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1217 	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1218 	encode_string(xdr, name->len, name->name);
1219 }
1220 
1221 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1222 {
1223 	encode_openhdr(xdr, arg);
1224 	encode_opentype(xdr, arg);
1225 	switch (arg->claim) {
1226 	case NFS4_OPEN_CLAIM_NULL:
1227 		encode_claim_null(xdr, arg->name);
1228 		break;
1229 	case NFS4_OPEN_CLAIM_PREVIOUS:
1230 		encode_claim_previous(xdr, arg->u.delegation_type);
1231 		break;
1232 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1233 		encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1234 		break;
1235 	default:
1236 		BUG();
1237 	}
1238 	hdr->nops++;
1239 	hdr->replen += decode_open_maxsz;
1240 }
1241 
1242 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1243 {
1244 	__be32 *p;
1245 
1246 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1247 	*p++ = cpu_to_be32(OP_OPEN_CONFIRM);
1248 	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1249 	*p = cpu_to_be32(arg->seqid->sequence->counter);
1250 	hdr->nops++;
1251 	hdr->replen += decode_open_confirm_maxsz;
1252 }
1253 
1254 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1255 {
1256 	__be32 *p;
1257 
1258 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1259 	*p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
1260 	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1261 	*p = cpu_to_be32(arg->seqid->sequence->counter);
1262 	encode_share_access(xdr, arg->fmode);
1263 	hdr->nops++;
1264 	hdr->replen += decode_open_downgrade_maxsz;
1265 }
1266 
1267 static void
1268 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1269 {
1270 	int len = fh->size;
1271 	__be32 *p;
1272 
1273 	p = reserve_space(xdr, 8 + len);
1274 	*p++ = cpu_to_be32(OP_PUTFH);
1275 	xdr_encode_opaque(p, fh->data, len);
1276 	hdr->nops++;
1277 	hdr->replen += decode_putfh_maxsz;
1278 }
1279 
1280 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1281 {
1282 	__be32 *p;
1283 
1284 	p = reserve_space(xdr, 4);
1285 	*p = cpu_to_be32(OP_PUTROOTFH);
1286 	hdr->nops++;
1287 	hdr->replen += decode_putrootfh_maxsz;
1288 }
1289 
1290 static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx)
1291 {
1292 	nfs4_stateid stateid;
1293 	__be32 *p;
1294 
1295 	p = reserve_space(xdr, NFS4_STATEID_SIZE);
1296 	if (ctx->state != NULL) {
1297 		nfs4_copy_stateid(&stateid, ctx->state, ctx->lockowner);
1298 		xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
1299 	} else
1300 		xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1301 }
1302 
1303 static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
1304 {
1305 	__be32 *p;
1306 
1307 	p = reserve_space(xdr, 4);
1308 	*p = cpu_to_be32(OP_READ);
1309 
1310 	encode_stateid(xdr, args->context);
1311 
1312 	p = reserve_space(xdr, 12);
1313 	p = xdr_encode_hyper(p, args->offset);
1314 	*p = cpu_to_be32(args->count);
1315 	hdr->nops++;
1316 	hdr->replen += decode_read_maxsz;
1317 }
1318 
1319 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1320 {
1321 	uint32_t attrs[2] = {
1322 		FATTR4_WORD0_RDATTR_ERROR|FATTR4_WORD0_FILEID,
1323 		FATTR4_WORD1_MOUNTED_ON_FILEID,
1324 	};
1325 	__be32 *p;
1326 
1327 	p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
1328 	*p++ = cpu_to_be32(OP_READDIR);
1329 	p = xdr_encode_hyper(p, readdir->cookie);
1330 	p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
1331 	*p++ = cpu_to_be32(readdir->count >> 1);  /* We're not doing readdirplus */
1332 	*p++ = cpu_to_be32(readdir->count);
1333 	*p++ = cpu_to_be32(2);
1334 	/* Switch to mounted_on_fileid if the server supports it */
1335 	if (readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
1336 		attrs[0] &= ~FATTR4_WORD0_FILEID;
1337 	else
1338 		attrs[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
1339 	*p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
1340 	*p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
1341 	hdr->nops++;
1342 	hdr->replen += decode_readdir_maxsz;
1343 	dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
1344 			__func__,
1345 			(unsigned long long)readdir->cookie,
1346 			((u32 *)readdir->verifier.data)[0],
1347 			((u32 *)readdir->verifier.data)[1],
1348 			attrs[0] & readdir->bitmask[0],
1349 			attrs[1] & readdir->bitmask[1]);
1350 }
1351 
1352 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1353 {
1354 	__be32 *p;
1355 
1356 	p = reserve_space(xdr, 4);
1357 	*p = cpu_to_be32(OP_READLINK);
1358 	hdr->nops++;
1359 	hdr->replen += decode_readlink_maxsz;
1360 }
1361 
1362 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1363 {
1364 	__be32 *p;
1365 
1366 	p = reserve_space(xdr, 8 + name->len);
1367 	*p++ = cpu_to_be32(OP_REMOVE);
1368 	xdr_encode_opaque(p, name->name, name->len);
1369 	hdr->nops++;
1370 	hdr->replen += decode_remove_maxsz;
1371 }
1372 
1373 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1374 {
1375 	__be32 *p;
1376 
1377 	p = reserve_space(xdr, 4);
1378 	*p = cpu_to_be32(OP_RENAME);
1379 	encode_string(xdr, oldname->len, oldname->name);
1380 	encode_string(xdr, newname->len, newname->name);
1381 	hdr->nops++;
1382 	hdr->replen += decode_rename_maxsz;
1383 }
1384 
1385 static void encode_renew(struct xdr_stream *xdr, const struct nfs_client *client_stateid, struct compound_hdr *hdr)
1386 {
1387 	__be32 *p;
1388 
1389 	p = reserve_space(xdr, 12);
1390 	*p++ = cpu_to_be32(OP_RENEW);
1391 	xdr_encode_hyper(p, client_stateid->cl_clientid);
1392 	hdr->nops++;
1393 	hdr->replen += decode_renew_maxsz;
1394 }
1395 
1396 static void
1397 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1398 {
1399 	__be32 *p;
1400 
1401 	p = reserve_space(xdr, 4);
1402 	*p = cpu_to_be32(OP_RESTOREFH);
1403 	hdr->nops++;
1404 	hdr->replen += decode_restorefh_maxsz;
1405 }
1406 
1407 static int
1408 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1409 {
1410 	__be32 *p;
1411 
1412 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1413 	*p++ = cpu_to_be32(OP_SETATTR);
1414 	xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1415 	p = reserve_space(xdr, 2*4);
1416 	*p++ = cpu_to_be32(1);
1417 	*p = cpu_to_be32(FATTR4_WORD0_ACL);
1418 	if (arg->acl_len % 4)
1419 		return -EINVAL;
1420 	p = reserve_space(xdr, 4);
1421 	*p = cpu_to_be32(arg->acl_len);
1422 	xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1423 	hdr->nops++;
1424 	hdr->replen += decode_setacl_maxsz;
1425 	return 0;
1426 }
1427 
1428 static void
1429 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1430 {
1431 	__be32 *p;
1432 
1433 	p = reserve_space(xdr, 4);
1434 	*p = cpu_to_be32(OP_SAVEFH);
1435 	hdr->nops++;
1436 	hdr->replen += decode_savefh_maxsz;
1437 }
1438 
1439 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1440 {
1441 	__be32 *p;
1442 
1443 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1444 	*p++ = cpu_to_be32(OP_SETATTR);
1445 	xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
1446 	hdr->nops++;
1447 	hdr->replen += decode_setattr_maxsz;
1448 	encode_attrs(xdr, arg->iap, server);
1449 }
1450 
1451 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1452 {
1453 	__be32 *p;
1454 
1455 	p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
1456 	*p++ = cpu_to_be32(OP_SETCLIENTID);
1457 	xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);
1458 
1459 	encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1460 	p = reserve_space(xdr, 4);
1461 	*p = cpu_to_be32(setclientid->sc_prog);
1462 	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1463 	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1464 	p = reserve_space(xdr, 4);
1465 	*p = cpu_to_be32(setclientid->sc_cb_ident);
1466 	hdr->nops++;
1467 	hdr->replen += decode_setclientid_maxsz;
1468 }
1469 
1470 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs_client *client_state, struct compound_hdr *hdr)
1471 {
1472 	__be32 *p;
1473 
1474 	p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
1475 	*p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
1476 	p = xdr_encode_hyper(p, client_state->cl_clientid);
1477 	xdr_encode_opaque_fixed(p, client_state->cl_confirm.data, NFS4_VERIFIER_SIZE);
1478 	hdr->nops++;
1479 	hdr->replen += decode_setclientid_confirm_maxsz;
1480 }
1481 
1482 static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1483 {
1484 	__be32 *p;
1485 
1486 	p = reserve_space(xdr, 4);
1487 	*p = cpu_to_be32(OP_WRITE);
1488 
1489 	encode_stateid(xdr, args->context);
1490 
1491 	p = reserve_space(xdr, 16);
1492 	p = xdr_encode_hyper(p, args->offset);
1493 	*p++ = cpu_to_be32(args->stable);
1494 	*p = cpu_to_be32(args->count);
1495 
1496 	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1497 	hdr->nops++;
1498 	hdr->replen += decode_write_maxsz;
1499 }
1500 
1501 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1502 {
1503 	__be32 *p;
1504 
1505 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1506 
1507 	*p++ = cpu_to_be32(OP_DELEGRETURN);
1508 	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1509 	hdr->nops++;
1510 	hdr->replen += decode_delegreturn_maxsz;
1511 }
1512 
1513 #if defined(CONFIG_NFS_V4_1)
1514 /* NFSv4.1 operations */
1515 static void encode_exchange_id(struct xdr_stream *xdr,
1516 			       struct nfs41_exchange_id_args *args,
1517 			       struct compound_hdr *hdr)
1518 {
1519 	__be32 *p;
1520 
1521 	p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
1522 	*p++ = cpu_to_be32(OP_EXCHANGE_ID);
1523 	xdr_encode_opaque_fixed(p, args->verifier->data, sizeof(args->verifier->data));
1524 
1525 	encode_string(xdr, args->id_len, args->id);
1526 
1527 	p = reserve_space(xdr, 12);
1528 	*p++ = cpu_to_be32(args->flags);
1529 	*p++ = cpu_to_be32(0);	/* zero length state_protect4_a */
1530 	*p = cpu_to_be32(0);	/* zero length implementation id array */
1531 	hdr->nops++;
1532 	hdr->replen += decode_exchange_id_maxsz;
1533 }
1534 
1535 static void encode_create_session(struct xdr_stream *xdr,
1536 				  struct nfs41_create_session_args *args,
1537 				  struct compound_hdr *hdr)
1538 {
1539 	__be32 *p;
1540 	char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
1541 	uint32_t len;
1542 	struct nfs_client *clp = args->client;
1543 
1544 	len = scnprintf(machine_name, sizeof(machine_name), "%s",
1545 			clp->cl_ipaddr);
1546 
1547 	p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
1548 	*p++ = cpu_to_be32(OP_CREATE_SESSION);
1549 	p = xdr_encode_hyper(p, clp->cl_ex_clid);
1550 	*p++ = cpu_to_be32(clp->cl_seqid);			/*Sequence id */
1551 	*p++ = cpu_to_be32(args->flags);			/*flags */
1552 
1553 	/* Fore Channel */
1554 	*p++ = cpu_to_be32(args->fc_attrs.headerpadsz);	/* header padding size */
1555 	*p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz);	/* max req size */
1556 	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz);	/* max resp size */
1557 	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
1558 	*p++ = cpu_to_be32(args->fc_attrs.max_ops);	/* max operations */
1559 	*p++ = cpu_to_be32(args->fc_attrs.max_reqs);	/* max requests */
1560 	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1561 
1562 	/* Back Channel */
1563 	*p++ = cpu_to_be32(args->fc_attrs.headerpadsz);	/* header padding size */
1564 	*p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz);	/* max req size */
1565 	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz);	/* max resp size */
1566 	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
1567 	*p++ = cpu_to_be32(args->bc_attrs.max_ops);	/* max operations */
1568 	*p++ = cpu_to_be32(args->bc_attrs.max_reqs);	/* max requests */
1569 	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1570 
1571 	*p++ = cpu_to_be32(args->cb_program);		/* cb_program */
1572 	*p++ = cpu_to_be32(1);
1573 	*p++ = cpu_to_be32(RPC_AUTH_UNIX);			/* auth_sys */
1574 
1575 	/* authsys_parms rfc1831 */
1576 	*p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);	/* stamp */
1577 	p = xdr_encode_opaque(p, machine_name, len);
1578 	*p++ = cpu_to_be32(0);				/* UID */
1579 	*p++ = cpu_to_be32(0);				/* GID */
1580 	*p = cpu_to_be32(0);				/* No more gids */
1581 	hdr->nops++;
1582 	hdr->replen += decode_create_session_maxsz;
1583 }
1584 
1585 static void encode_destroy_session(struct xdr_stream *xdr,
1586 				   struct nfs4_session *session,
1587 				   struct compound_hdr *hdr)
1588 {
1589 	__be32 *p;
1590 	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
1591 	*p++ = cpu_to_be32(OP_DESTROY_SESSION);
1592 	xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1593 	hdr->nops++;
1594 	hdr->replen += decode_destroy_session_maxsz;
1595 }
1596 #endif /* CONFIG_NFS_V4_1 */
1597 
1598 static void encode_sequence(struct xdr_stream *xdr,
1599 			    const struct nfs4_sequence_args *args,
1600 			    struct compound_hdr *hdr)
1601 {
1602 #if defined(CONFIG_NFS_V4_1)
1603 	struct nfs4_session *session = args->sa_session;
1604 	struct nfs4_slot_table *tp;
1605 	struct nfs4_slot *slot;
1606 	__be32 *p;
1607 
1608 	if (!session)
1609 		return;
1610 
1611 	tp = &session->fc_slot_table;
1612 
1613 	WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
1614 	slot = tp->slots + args->sa_slotid;
1615 
1616 	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
1617 	*p++ = cpu_to_be32(OP_SEQUENCE);
1618 
1619 	/*
1620 	 * Sessionid + seqid + slotid + max slotid + cache_this
1621 	 */
1622 	dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1623 		"max_slotid=%d cache_this=%d\n",
1624 		__func__,
1625 		((u32 *)session->sess_id.data)[0],
1626 		((u32 *)session->sess_id.data)[1],
1627 		((u32 *)session->sess_id.data)[2],
1628 		((u32 *)session->sess_id.data)[3],
1629 		slot->seq_nr, args->sa_slotid,
1630 		tp->highest_used_slotid, args->sa_cache_this);
1631 	p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1632 	*p++ = cpu_to_be32(slot->seq_nr);
1633 	*p++ = cpu_to_be32(args->sa_slotid);
1634 	*p++ = cpu_to_be32(tp->highest_used_slotid);
1635 	*p = cpu_to_be32(args->sa_cache_this);
1636 	hdr->nops++;
1637 	hdr->replen += decode_sequence_maxsz;
1638 #endif /* CONFIG_NFS_V4_1 */
1639 }
1640 
1641 /*
1642  * END OF "GENERIC" ENCODE ROUTINES.
1643  */
1644 
1645 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
1646 {
1647 #if defined(CONFIG_NFS_V4_1)
1648 	if (args->sa_session)
1649 		return args->sa_session->clp->cl_minorversion;
1650 #endif /* CONFIG_NFS_V4_1 */
1651 	return 0;
1652 }
1653 
1654 /*
1655  * Encode an ACCESS request
1656  */
1657 static int nfs4_xdr_enc_access(struct rpc_rqst *req, __be32 *p, const struct nfs4_accessargs *args)
1658 {
1659 	struct xdr_stream xdr;
1660 	struct compound_hdr hdr = {
1661 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1662 	};
1663 
1664 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1665 	encode_compound_hdr(&xdr, req, &hdr);
1666 	encode_sequence(&xdr, &args->seq_args, &hdr);
1667 	encode_putfh(&xdr, args->fh, &hdr);
1668 	encode_access(&xdr, args->access, &hdr);
1669 	encode_getfattr(&xdr, args->bitmask, &hdr);
1670 	encode_nops(&hdr);
1671 	return 0;
1672 }
1673 
1674 /*
1675  * Encode LOOKUP request
1676  */
1677 static int nfs4_xdr_enc_lookup(struct rpc_rqst *req, __be32 *p, const struct nfs4_lookup_arg *args)
1678 {
1679 	struct xdr_stream xdr;
1680 	struct compound_hdr hdr = {
1681 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1682 	};
1683 
1684 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1685 	encode_compound_hdr(&xdr, req, &hdr);
1686 	encode_sequence(&xdr, &args->seq_args, &hdr);
1687 	encode_putfh(&xdr, args->dir_fh, &hdr);
1688 	encode_lookup(&xdr, args->name, &hdr);
1689 	encode_getfh(&xdr, &hdr);
1690 	encode_getfattr(&xdr, args->bitmask, &hdr);
1691 	encode_nops(&hdr);
1692 	return 0;
1693 }
1694 
1695 /*
1696  * Encode LOOKUP_ROOT request
1697  */
1698 static int nfs4_xdr_enc_lookup_root(struct rpc_rqst *req, __be32 *p, const struct nfs4_lookup_root_arg *args)
1699 {
1700 	struct xdr_stream xdr;
1701 	struct compound_hdr hdr = {
1702 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1703 	};
1704 
1705 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1706 	encode_compound_hdr(&xdr, req, &hdr);
1707 	encode_sequence(&xdr, &args->seq_args, &hdr);
1708 	encode_putrootfh(&xdr, &hdr);
1709 	encode_getfh(&xdr, &hdr);
1710 	encode_getfattr(&xdr, args->bitmask, &hdr);
1711 	encode_nops(&hdr);
1712 	return 0;
1713 }
1714 
1715 /*
1716  * Encode REMOVE request
1717  */
1718 static int nfs4_xdr_enc_remove(struct rpc_rqst *req, __be32 *p, const struct nfs_removeargs *args)
1719 {
1720 	struct xdr_stream xdr;
1721 	struct compound_hdr hdr = {
1722 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1723 	};
1724 
1725 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1726 	encode_compound_hdr(&xdr, req, &hdr);
1727 	encode_sequence(&xdr, &args->seq_args, &hdr);
1728 	encode_putfh(&xdr, args->fh, &hdr);
1729 	encode_remove(&xdr, &args->name, &hdr);
1730 	encode_getfattr(&xdr, args->bitmask, &hdr);
1731 	encode_nops(&hdr);
1732 	return 0;
1733 }
1734 
1735 /*
1736  * Encode RENAME request
1737  */
1738 static int nfs4_xdr_enc_rename(struct rpc_rqst *req, __be32 *p, const struct nfs4_rename_arg *args)
1739 {
1740 	struct xdr_stream xdr;
1741 	struct compound_hdr hdr = {
1742 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1743 	};
1744 
1745 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1746 	encode_compound_hdr(&xdr, req, &hdr);
1747 	encode_sequence(&xdr, &args->seq_args, &hdr);
1748 	encode_putfh(&xdr, args->old_dir, &hdr);
1749 	encode_savefh(&xdr, &hdr);
1750 	encode_putfh(&xdr, args->new_dir, &hdr);
1751 	encode_rename(&xdr, args->old_name, args->new_name, &hdr);
1752 	encode_getfattr(&xdr, args->bitmask, &hdr);
1753 	encode_restorefh(&xdr, &hdr);
1754 	encode_getfattr(&xdr, args->bitmask, &hdr);
1755 	encode_nops(&hdr);
1756 	return 0;
1757 }
1758 
1759 /*
1760  * Encode LINK request
1761  */
1762 static int nfs4_xdr_enc_link(struct rpc_rqst *req, __be32 *p, const struct nfs4_link_arg *args)
1763 {
1764 	struct xdr_stream xdr;
1765 	struct compound_hdr hdr = {
1766 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1767 	};
1768 
1769 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1770 	encode_compound_hdr(&xdr, req, &hdr);
1771 	encode_sequence(&xdr, &args->seq_args, &hdr);
1772 	encode_putfh(&xdr, args->fh, &hdr);
1773 	encode_savefh(&xdr, &hdr);
1774 	encode_putfh(&xdr, args->dir_fh, &hdr);
1775 	encode_link(&xdr, args->name, &hdr);
1776 	encode_getfattr(&xdr, args->bitmask, &hdr);
1777 	encode_restorefh(&xdr, &hdr);
1778 	encode_getfattr(&xdr, args->bitmask, &hdr);
1779 	encode_nops(&hdr);
1780 	return 0;
1781 }
1782 
1783 /*
1784  * Encode CREATE request
1785  */
1786 static int nfs4_xdr_enc_create(struct rpc_rqst *req, __be32 *p, const struct nfs4_create_arg *args)
1787 {
1788 	struct xdr_stream xdr;
1789 	struct compound_hdr hdr = {
1790 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1791 	};
1792 
1793 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1794 	encode_compound_hdr(&xdr, req, &hdr);
1795 	encode_sequence(&xdr, &args->seq_args, &hdr);
1796 	encode_putfh(&xdr, args->dir_fh, &hdr);
1797 	encode_savefh(&xdr, &hdr);
1798 	encode_create(&xdr, args, &hdr);
1799 	encode_getfh(&xdr, &hdr);
1800 	encode_getfattr(&xdr, args->bitmask, &hdr);
1801 	encode_restorefh(&xdr, &hdr);
1802 	encode_getfattr(&xdr, args->bitmask, &hdr);
1803 	encode_nops(&hdr);
1804 	return 0;
1805 }
1806 
1807 /*
1808  * Encode SYMLINK request
1809  */
1810 static int nfs4_xdr_enc_symlink(struct rpc_rqst *req, __be32 *p, const struct nfs4_create_arg *args)
1811 {
1812 	return nfs4_xdr_enc_create(req, p, args);
1813 }
1814 
1815 /*
1816  * Encode GETATTR request
1817  */
1818 static int nfs4_xdr_enc_getattr(struct rpc_rqst *req, __be32 *p, const struct nfs4_getattr_arg *args)
1819 {
1820 	struct xdr_stream xdr;
1821 	struct compound_hdr hdr = {
1822 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1823 	};
1824 
1825 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1826 	encode_compound_hdr(&xdr, req, &hdr);
1827 	encode_sequence(&xdr, &args->seq_args, &hdr);
1828 	encode_putfh(&xdr, args->fh, &hdr);
1829 	encode_getfattr(&xdr, args->bitmask, &hdr);
1830 	encode_nops(&hdr);
1831 	return 0;
1832 }
1833 
1834 /*
1835  * Encode a CLOSE request
1836  */
1837 static int nfs4_xdr_enc_close(struct rpc_rqst *req, __be32 *p, struct nfs_closeargs *args)
1838 {
1839 	struct xdr_stream xdr;
1840 	struct compound_hdr hdr = {
1841 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1842 	};
1843 
1844 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1845 	encode_compound_hdr(&xdr, req, &hdr);
1846 	encode_sequence(&xdr, &args->seq_args, &hdr);
1847 	encode_putfh(&xdr, args->fh, &hdr);
1848 	encode_close(&xdr, args, &hdr);
1849 	encode_getfattr(&xdr, args->bitmask, &hdr);
1850 	encode_nops(&hdr);
1851 	return 0;
1852 }
1853 
1854 /*
1855  * Encode an OPEN request
1856  */
1857 static int nfs4_xdr_enc_open(struct rpc_rqst *req, __be32 *p, struct nfs_openargs *args)
1858 {
1859 	struct xdr_stream xdr;
1860 	struct compound_hdr hdr = {
1861 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1862 	};
1863 
1864 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1865 	encode_compound_hdr(&xdr, req, &hdr);
1866 	encode_sequence(&xdr, &args->seq_args, &hdr);
1867 	encode_putfh(&xdr, args->fh, &hdr);
1868 	encode_savefh(&xdr, &hdr);
1869 	encode_open(&xdr, args, &hdr);
1870 	encode_getfh(&xdr, &hdr);
1871 	encode_getfattr(&xdr, args->bitmask, &hdr);
1872 	encode_restorefh(&xdr, &hdr);
1873 	encode_getfattr(&xdr, args->bitmask, &hdr);
1874 	encode_nops(&hdr);
1875 	return 0;
1876 }
1877 
1878 /*
1879  * Encode an OPEN_CONFIRM request
1880  */
1881 static int nfs4_xdr_enc_open_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_open_confirmargs *args)
1882 {
1883 	struct xdr_stream xdr;
1884 	struct compound_hdr hdr = {
1885 		.nops   = 0,
1886 	};
1887 
1888 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1889 	encode_compound_hdr(&xdr, req, &hdr);
1890 	encode_putfh(&xdr, args->fh, &hdr);
1891 	encode_open_confirm(&xdr, args, &hdr);
1892 	encode_nops(&hdr);
1893 	return 0;
1894 }
1895 
1896 /*
1897  * Encode an OPEN request with no attributes.
1898  */
1899 static int nfs4_xdr_enc_open_noattr(struct rpc_rqst *req, __be32 *p, struct nfs_openargs *args)
1900 {
1901 	struct xdr_stream xdr;
1902 	struct compound_hdr hdr = {
1903 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1904 	};
1905 
1906 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1907 	encode_compound_hdr(&xdr, req, &hdr);
1908 	encode_sequence(&xdr, &args->seq_args, &hdr);
1909 	encode_putfh(&xdr, args->fh, &hdr);
1910 	encode_open(&xdr, args, &hdr);
1911 	encode_getfattr(&xdr, args->bitmask, &hdr);
1912 	encode_nops(&hdr);
1913 	return 0;
1914 }
1915 
1916 /*
1917  * Encode an OPEN_DOWNGRADE request
1918  */
1919 static int nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req, __be32 *p, struct nfs_closeargs *args)
1920 {
1921 	struct xdr_stream xdr;
1922 	struct compound_hdr hdr = {
1923 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1924 	};
1925 
1926 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1927 	encode_compound_hdr(&xdr, req, &hdr);
1928 	encode_sequence(&xdr, &args->seq_args, &hdr);
1929 	encode_putfh(&xdr, args->fh, &hdr);
1930 	encode_open_downgrade(&xdr, args, &hdr);
1931 	encode_getfattr(&xdr, args->bitmask, &hdr);
1932 	encode_nops(&hdr);
1933 	return 0;
1934 }
1935 
1936 /*
1937  * Encode a LOCK request
1938  */
1939 static int nfs4_xdr_enc_lock(struct rpc_rqst *req, __be32 *p, struct nfs_lock_args *args)
1940 {
1941 	struct xdr_stream xdr;
1942 	struct compound_hdr hdr = {
1943 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1944 	};
1945 
1946 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1947 	encode_compound_hdr(&xdr, req, &hdr);
1948 	encode_sequence(&xdr, &args->seq_args, &hdr);
1949 	encode_putfh(&xdr, args->fh, &hdr);
1950 	encode_lock(&xdr, args, &hdr);
1951 	encode_nops(&hdr);
1952 	return 0;
1953 }
1954 
1955 /*
1956  * Encode a LOCKT request
1957  */
1958 static int nfs4_xdr_enc_lockt(struct rpc_rqst *req, __be32 *p, struct nfs_lockt_args *args)
1959 {
1960 	struct xdr_stream xdr;
1961 	struct compound_hdr hdr = {
1962 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1963 	};
1964 
1965 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1966 	encode_compound_hdr(&xdr, req, &hdr);
1967 	encode_sequence(&xdr, &args->seq_args, &hdr);
1968 	encode_putfh(&xdr, args->fh, &hdr);
1969 	encode_lockt(&xdr, args, &hdr);
1970 	encode_nops(&hdr);
1971 	return 0;
1972 }
1973 
1974 /*
1975  * Encode a LOCKU request
1976  */
1977 static int nfs4_xdr_enc_locku(struct rpc_rqst *req, __be32 *p, struct nfs_locku_args *args)
1978 {
1979 	struct xdr_stream xdr;
1980 	struct compound_hdr hdr = {
1981 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
1982 	};
1983 
1984 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1985 	encode_compound_hdr(&xdr, req, &hdr);
1986 	encode_sequence(&xdr, &args->seq_args, &hdr);
1987 	encode_putfh(&xdr, args->fh, &hdr);
1988 	encode_locku(&xdr, args, &hdr);
1989 	encode_nops(&hdr);
1990 	return 0;
1991 }
1992 
1993 /*
1994  * Encode a READLINK request
1995  */
1996 static int nfs4_xdr_enc_readlink(struct rpc_rqst *req, __be32 *p, const struct nfs4_readlink *args)
1997 {
1998 	struct xdr_stream xdr;
1999 	struct compound_hdr hdr = {
2000 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2001 	};
2002 
2003 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2004 	encode_compound_hdr(&xdr, req, &hdr);
2005 	encode_sequence(&xdr, &args->seq_args, &hdr);
2006 	encode_putfh(&xdr, args->fh, &hdr);
2007 	encode_readlink(&xdr, args, req, &hdr);
2008 
2009 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2010 			args->pgbase, args->pglen);
2011 	encode_nops(&hdr);
2012 	return 0;
2013 }
2014 
2015 /*
2016  * Encode a READDIR request
2017  */
2018 static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, __be32 *p, const struct nfs4_readdir_arg *args)
2019 {
2020 	struct xdr_stream xdr;
2021 	struct compound_hdr hdr = {
2022 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2023 	};
2024 
2025 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2026 	encode_compound_hdr(&xdr, req, &hdr);
2027 	encode_sequence(&xdr, &args->seq_args, &hdr);
2028 	encode_putfh(&xdr, args->fh, &hdr);
2029 	encode_readdir(&xdr, args, req, &hdr);
2030 
2031 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2032 			 args->pgbase, args->count);
2033 	dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2034 			__func__, hdr.replen << 2, args->pages,
2035 			args->pgbase, args->count);
2036 	encode_nops(&hdr);
2037 	return 0;
2038 }
2039 
2040 /*
2041  * Encode a READ request
2042  */
2043 static int nfs4_xdr_enc_read(struct rpc_rqst *req, __be32 *p, struct nfs_readargs *args)
2044 {
2045 	struct xdr_stream xdr;
2046 	struct compound_hdr hdr = {
2047 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2048 	};
2049 
2050 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2051 	encode_compound_hdr(&xdr, req, &hdr);
2052 	encode_sequence(&xdr, &args->seq_args, &hdr);
2053 	encode_putfh(&xdr, args->fh, &hdr);
2054 	encode_read(&xdr, args, &hdr);
2055 
2056 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2057 			 args->pages, args->pgbase, args->count);
2058 	req->rq_rcv_buf.flags |= XDRBUF_READ;
2059 	encode_nops(&hdr);
2060 	return 0;
2061 }
2062 
2063 /*
2064  * Encode an SETATTR request
2065  */
2066 static int nfs4_xdr_enc_setattr(struct rpc_rqst *req, __be32 *p, struct nfs_setattrargs *args)
2067 {
2068 	struct xdr_stream xdr;
2069 	struct compound_hdr hdr = {
2070 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2071 	};
2072 
2073 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2074 	encode_compound_hdr(&xdr, req, &hdr);
2075 	encode_sequence(&xdr, &args->seq_args, &hdr);
2076 	encode_putfh(&xdr, args->fh, &hdr);
2077 	encode_setattr(&xdr, args, args->server, &hdr);
2078 	encode_getfattr(&xdr, args->bitmask, &hdr);
2079 	encode_nops(&hdr);
2080 	return 0;
2081 }
2082 
2083 /*
2084  * Encode a GETACL request
2085  */
2086 static int
2087 nfs4_xdr_enc_getacl(struct rpc_rqst *req, __be32 *p,
2088 		struct nfs_getaclargs *args)
2089 {
2090 	struct xdr_stream xdr;
2091 	struct compound_hdr hdr = {
2092 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2093 	};
2094 	uint32_t replen;
2095 
2096 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2097 	encode_compound_hdr(&xdr, req, &hdr);
2098 	encode_sequence(&xdr, &args->seq_args, &hdr);
2099 	encode_putfh(&xdr, args->fh, &hdr);
2100 	replen = hdr.replen + nfs4_fattr_bitmap_maxsz + 1;
2101 	encode_getattr_two(&xdr, FATTR4_WORD0_ACL, 0, &hdr);
2102 
2103 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2104 		args->acl_pages, args->acl_pgbase, args->acl_len);
2105 	encode_nops(&hdr);
2106 	return 0;
2107 }
2108 
2109 /*
2110  * Encode a WRITE request
2111  */
2112 static int nfs4_xdr_enc_write(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
2113 {
2114 	struct xdr_stream xdr;
2115 	struct compound_hdr hdr = {
2116 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2117 	};
2118 
2119 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2120 	encode_compound_hdr(&xdr, req, &hdr);
2121 	encode_sequence(&xdr, &args->seq_args, &hdr);
2122 	encode_putfh(&xdr, args->fh, &hdr);
2123 	encode_write(&xdr, args, &hdr);
2124 	req->rq_snd_buf.flags |= XDRBUF_WRITE;
2125 	encode_getfattr(&xdr, args->bitmask, &hdr);
2126 	encode_nops(&hdr);
2127 	return 0;
2128 }
2129 
2130 /*
2131  *  a COMMIT request
2132  */
2133 static int nfs4_xdr_enc_commit(struct rpc_rqst *req, __be32 *p, struct nfs_writeargs *args)
2134 {
2135 	struct xdr_stream xdr;
2136 	struct compound_hdr hdr = {
2137 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2138 	};
2139 
2140 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2141 	encode_compound_hdr(&xdr, req, &hdr);
2142 	encode_sequence(&xdr, &args->seq_args, &hdr);
2143 	encode_putfh(&xdr, args->fh, &hdr);
2144 	encode_commit(&xdr, args, &hdr);
2145 	encode_getfattr(&xdr, args->bitmask, &hdr);
2146 	encode_nops(&hdr);
2147 	return 0;
2148 }
2149 
2150 /*
2151  * FSINFO request
2152  */
2153 static int nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, __be32 *p, struct nfs4_fsinfo_arg *args)
2154 {
2155 	struct xdr_stream xdr;
2156 	struct compound_hdr hdr = {
2157 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2158 	};
2159 
2160 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2161 	encode_compound_hdr(&xdr, req, &hdr);
2162 	encode_sequence(&xdr, &args->seq_args, &hdr);
2163 	encode_putfh(&xdr, args->fh, &hdr);
2164 	encode_fsinfo(&xdr, args->bitmask, &hdr);
2165 	encode_nops(&hdr);
2166 	return 0;
2167 }
2168 
2169 /*
2170  * a PATHCONF request
2171  */
2172 static int nfs4_xdr_enc_pathconf(struct rpc_rqst *req, __be32 *p, const struct nfs4_pathconf_arg *args)
2173 {
2174 	struct xdr_stream xdr;
2175 	struct compound_hdr hdr = {
2176 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2177 	};
2178 
2179 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2180 	encode_compound_hdr(&xdr, req, &hdr);
2181 	encode_sequence(&xdr, &args->seq_args, &hdr);
2182 	encode_putfh(&xdr, args->fh, &hdr);
2183 	encode_getattr_one(&xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2184 			   &hdr);
2185 	encode_nops(&hdr);
2186 	return 0;
2187 }
2188 
2189 /*
2190  * a STATFS request
2191  */
2192 static int nfs4_xdr_enc_statfs(struct rpc_rqst *req, __be32 *p, const struct nfs4_statfs_arg *args)
2193 {
2194 	struct xdr_stream xdr;
2195 	struct compound_hdr hdr = {
2196 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2197 	};
2198 
2199 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2200 	encode_compound_hdr(&xdr, req, &hdr);
2201 	encode_sequence(&xdr, &args->seq_args, &hdr);
2202 	encode_putfh(&xdr, args->fh, &hdr);
2203 	encode_getattr_two(&xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2204 			   args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2205 	encode_nops(&hdr);
2206 	return 0;
2207 }
2208 
2209 /*
2210  * GETATTR_BITMAP request
2211  */
2212 static int nfs4_xdr_enc_server_caps(struct rpc_rqst *req, __be32 *p,
2213 				    struct nfs4_server_caps_arg *args)
2214 {
2215 	struct xdr_stream xdr;
2216 	struct compound_hdr hdr = {
2217 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2218 	};
2219 
2220 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2221 	encode_compound_hdr(&xdr, req, &hdr);
2222 	encode_sequence(&xdr, &args->seq_args, &hdr);
2223 	encode_putfh(&xdr, args->fhandle, &hdr);
2224 	encode_getattr_one(&xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2225 			   FATTR4_WORD0_LINK_SUPPORT|
2226 			   FATTR4_WORD0_SYMLINK_SUPPORT|
2227 			   FATTR4_WORD0_ACLSUPPORT, &hdr);
2228 	encode_nops(&hdr);
2229 	return 0;
2230 }
2231 
2232 /*
2233  * a RENEW request
2234  */
2235 static int nfs4_xdr_enc_renew(struct rpc_rqst *req, __be32 *p, struct nfs_client *clp)
2236 {
2237 	struct xdr_stream xdr;
2238 	struct compound_hdr hdr = {
2239 		.nops	= 0,
2240 	};
2241 
2242 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2243 	encode_compound_hdr(&xdr, req, &hdr);
2244 	encode_renew(&xdr, clp, &hdr);
2245 	encode_nops(&hdr);
2246 	return 0;
2247 }
2248 
2249 /*
2250  * a SETCLIENTID request
2251  */
2252 static int nfs4_xdr_enc_setclientid(struct rpc_rqst *req, __be32 *p, struct nfs4_setclientid *sc)
2253 {
2254 	struct xdr_stream xdr;
2255 	struct compound_hdr hdr = {
2256 		.nops	= 0,
2257 	};
2258 
2259 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2260 	encode_compound_hdr(&xdr, req, &hdr);
2261 	encode_setclientid(&xdr, sc, &hdr);
2262 	encode_nops(&hdr);
2263 	return 0;
2264 }
2265 
2266 /*
2267  * a SETCLIENTID_CONFIRM request
2268  */
2269 static int nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_client *clp)
2270 {
2271 	struct xdr_stream xdr;
2272 	struct compound_hdr hdr = {
2273 		.nops	= 0,
2274 	};
2275 	const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
2276 
2277 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2278 	encode_compound_hdr(&xdr, req, &hdr);
2279 	encode_setclientid_confirm(&xdr, clp, &hdr);
2280 	encode_putrootfh(&xdr, &hdr);
2281 	encode_fsinfo(&xdr, lease_bitmap, &hdr);
2282 	encode_nops(&hdr);
2283 	return 0;
2284 }
2285 
2286 /*
2287  * DELEGRETURN request
2288  */
2289 static int nfs4_xdr_enc_delegreturn(struct rpc_rqst *req, __be32 *p, const struct nfs4_delegreturnargs *args)
2290 {
2291 	struct xdr_stream xdr;
2292 	struct compound_hdr hdr = {
2293 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2294 	};
2295 
2296 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2297 	encode_compound_hdr(&xdr, req, &hdr);
2298 	encode_sequence(&xdr, &args->seq_args, &hdr);
2299 	encode_putfh(&xdr, args->fhandle, &hdr);
2300 	encode_delegreturn(&xdr, args->stateid, &hdr);
2301 	encode_getfattr(&xdr, args->bitmask, &hdr);
2302 	encode_nops(&hdr);
2303 	return 0;
2304 }
2305 
2306 /*
2307  * Encode FS_LOCATIONS request
2308  */
2309 static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, __be32 *p, struct nfs4_fs_locations_arg *args)
2310 {
2311 	struct xdr_stream xdr;
2312 	struct compound_hdr hdr = {
2313 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2314 	};
2315 	uint32_t replen;
2316 
2317 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2318 	encode_compound_hdr(&xdr, req, &hdr);
2319 	encode_sequence(&xdr, &args->seq_args, &hdr);
2320 	encode_putfh(&xdr, args->dir_fh, &hdr);
2321 	encode_lookup(&xdr, args->name, &hdr);
2322 	replen = hdr.replen;	/* get the attribute into args->page */
2323 	encode_fs_locations(&xdr, args->bitmask, &hdr);
2324 
2325 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2326 			0, PAGE_SIZE);
2327 	encode_nops(&hdr);
2328 	return 0;
2329 }
2330 
2331 #if defined(CONFIG_NFS_V4_1)
2332 /*
2333  * EXCHANGE_ID request
2334  */
2335 static int nfs4_xdr_enc_exchange_id(struct rpc_rqst *req, uint32_t *p,
2336 				    struct nfs41_exchange_id_args *args)
2337 {
2338 	struct xdr_stream xdr;
2339 	struct compound_hdr hdr = {
2340 		.minorversion = args->client->cl_minorversion,
2341 	};
2342 
2343 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2344 	encode_compound_hdr(&xdr, req, &hdr);
2345 	encode_exchange_id(&xdr, args, &hdr);
2346 	encode_nops(&hdr);
2347 	return 0;
2348 }
2349 
2350 /*
2351  * a CREATE_SESSION request
2352  */
2353 static int nfs4_xdr_enc_create_session(struct rpc_rqst *req, uint32_t *p,
2354 				       struct nfs41_create_session_args *args)
2355 {
2356 	struct xdr_stream xdr;
2357 	struct compound_hdr hdr = {
2358 		.minorversion = args->client->cl_minorversion,
2359 	};
2360 
2361 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2362 	encode_compound_hdr(&xdr, req, &hdr);
2363 	encode_create_session(&xdr, args, &hdr);
2364 	encode_nops(&hdr);
2365 	return 0;
2366 }
2367 
2368 /*
2369  * a DESTROY_SESSION request
2370  */
2371 static int nfs4_xdr_enc_destroy_session(struct rpc_rqst *req, uint32_t *p,
2372 					struct nfs4_session *session)
2373 {
2374 	struct xdr_stream xdr;
2375 	struct compound_hdr hdr = {
2376 		.minorversion = session->clp->cl_minorversion,
2377 	};
2378 
2379 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2380 	encode_compound_hdr(&xdr, req, &hdr);
2381 	encode_destroy_session(&xdr, session, &hdr);
2382 	encode_nops(&hdr);
2383 	return 0;
2384 }
2385 
2386 /*
2387  * a SEQUENCE request
2388  */
2389 static int nfs4_xdr_enc_sequence(struct rpc_rqst *req, uint32_t *p,
2390 				 struct nfs4_sequence_args *args)
2391 {
2392 	struct xdr_stream xdr;
2393 	struct compound_hdr hdr = {
2394 		.minorversion = nfs4_xdr_minorversion(args),
2395 	};
2396 
2397 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2398 	encode_compound_hdr(&xdr, req, &hdr);
2399 	encode_sequence(&xdr, args, &hdr);
2400 	encode_nops(&hdr);
2401 	return 0;
2402 }
2403 
2404 /*
2405  * a GET_LEASE_TIME request
2406  */
2407 static int nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req, uint32_t *p,
2408 				       struct nfs4_get_lease_time_args *args)
2409 {
2410 	struct xdr_stream xdr;
2411 	struct compound_hdr hdr = {
2412 		.minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2413 	};
2414 	const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
2415 
2416 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2417 	encode_compound_hdr(&xdr, req, &hdr);
2418 	encode_sequence(&xdr, &args->la_seq_args, &hdr);
2419 	encode_putrootfh(&xdr, &hdr);
2420 	encode_fsinfo(&xdr, lease_bitmap, &hdr);
2421 	encode_nops(&hdr);
2422 	return 0;
2423 }
2424 #endif /* CONFIG_NFS_V4_1 */
2425 
2426 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
2427 {
2428 	dprintk("nfs: %s: prematurely hit end of receive buffer. "
2429 		"Remaining buffer length is %tu words.\n",
2430 		func, xdr->end - xdr->p);
2431 }
2432 
2433 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
2434 {
2435 	__be32 *p;
2436 
2437 	p = xdr_inline_decode(xdr, 4);
2438 	if (unlikely(!p))
2439 		goto out_overflow;
2440 	*len = be32_to_cpup(p);
2441 	p = xdr_inline_decode(xdr, *len);
2442 	if (unlikely(!p))
2443 		goto out_overflow;
2444 	*string = (char *)p;
2445 	return 0;
2446 out_overflow:
2447 	print_overflow_msg(__func__, xdr);
2448 	return -EIO;
2449 }
2450 
2451 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
2452 {
2453 	__be32 *p;
2454 
2455 	p = xdr_inline_decode(xdr, 8);
2456 	if (unlikely(!p))
2457 		goto out_overflow;
2458 	hdr->status = be32_to_cpup(p++);
2459 	hdr->taglen = be32_to_cpup(p);
2460 
2461 	p = xdr_inline_decode(xdr, hdr->taglen + 4);
2462 	if (unlikely(!p))
2463 		goto out_overflow;
2464 	hdr->tag = (char *)p;
2465 	p += XDR_QUADLEN(hdr->taglen);
2466 	hdr->nops = be32_to_cpup(p);
2467 	if (unlikely(hdr->nops < 1))
2468 		return nfs4_stat_to_errno(hdr->status);
2469 	return 0;
2470 out_overflow:
2471 	print_overflow_msg(__func__, xdr);
2472 	return -EIO;
2473 }
2474 
2475 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
2476 {
2477 	__be32 *p;
2478 	uint32_t opnum;
2479 	int32_t nfserr;
2480 
2481 	p = xdr_inline_decode(xdr, 8);
2482 	if (unlikely(!p))
2483 		goto out_overflow;
2484 	opnum = be32_to_cpup(p++);
2485 	if (opnum != expected) {
2486 		dprintk("nfs: Server returned operation"
2487 			" %d but we issued a request for %d\n",
2488 				opnum, expected);
2489 		return -EIO;
2490 	}
2491 	nfserr = be32_to_cpup(p);
2492 	if (nfserr != NFS_OK)
2493 		return nfs4_stat_to_errno(nfserr);
2494 	return 0;
2495 out_overflow:
2496 	print_overflow_msg(__func__, xdr);
2497 	return -EIO;
2498 }
2499 
2500 /* Dummy routine */
2501 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
2502 {
2503 	__be32 *p;
2504 	unsigned int strlen;
2505 	char *str;
2506 
2507 	p = xdr_inline_decode(xdr, 12);
2508 	if (likely(p))
2509 		return decode_opaque_inline(xdr, &strlen, &str);
2510 	print_overflow_msg(__func__, xdr);
2511 	return -EIO;
2512 }
2513 
2514 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
2515 {
2516 	uint32_t bmlen;
2517 	__be32 *p;
2518 
2519 	p = xdr_inline_decode(xdr, 4);
2520 	if (unlikely(!p))
2521 		goto out_overflow;
2522 	bmlen = be32_to_cpup(p);
2523 
2524 	bitmap[0] = bitmap[1] = 0;
2525 	p = xdr_inline_decode(xdr, (bmlen << 2));
2526 	if (unlikely(!p))
2527 		goto out_overflow;
2528 	if (bmlen > 0) {
2529 		bitmap[0] = be32_to_cpup(p++);
2530 		if (bmlen > 1)
2531 			bitmap[1] = be32_to_cpup(p);
2532 	}
2533 	return 0;
2534 out_overflow:
2535 	print_overflow_msg(__func__, xdr);
2536 	return -EIO;
2537 }
2538 
2539 static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, __be32 **savep)
2540 {
2541 	__be32 *p;
2542 
2543 	p = xdr_inline_decode(xdr, 4);
2544 	if (unlikely(!p))
2545 		goto out_overflow;
2546 	*attrlen = be32_to_cpup(p);
2547 	*savep = xdr->p;
2548 	return 0;
2549 out_overflow:
2550 	print_overflow_msg(__func__, xdr);
2551 	return -EIO;
2552 }
2553 
2554 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
2555 {
2556 	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
2557 		decode_attr_bitmap(xdr, bitmask);
2558 		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
2559 	} else
2560 		bitmask[0] = bitmask[1] = 0;
2561 	dprintk("%s: bitmask=%08x:%08x\n", __func__, bitmask[0], bitmask[1]);
2562 	return 0;
2563 }
2564 
2565 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
2566 {
2567 	__be32 *p;
2568 	int ret = 0;
2569 
2570 	*type = 0;
2571 	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
2572 		return -EIO;
2573 	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
2574 		p = xdr_inline_decode(xdr, 4);
2575 		if (unlikely(!p))
2576 			goto out_overflow;
2577 		*type = be32_to_cpup(p);
2578 		if (*type < NF4REG || *type > NF4NAMEDATTR) {
2579 			dprintk("%s: bad type %d\n", __func__, *type);
2580 			return -EIO;
2581 		}
2582 		bitmap[0] &= ~FATTR4_WORD0_TYPE;
2583 		ret = NFS_ATTR_FATTR_TYPE;
2584 	}
2585 	dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
2586 	return ret;
2587 out_overflow:
2588 	print_overflow_msg(__func__, xdr);
2589 	return -EIO;
2590 }
2591 
2592 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
2593 {
2594 	__be32 *p;
2595 	int ret = 0;
2596 
2597 	*change = 0;
2598 	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
2599 		return -EIO;
2600 	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
2601 		p = xdr_inline_decode(xdr, 8);
2602 		if (unlikely(!p))
2603 			goto out_overflow;
2604 		xdr_decode_hyper(p, change);
2605 		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
2606 		ret = NFS_ATTR_FATTR_CHANGE;
2607 	}
2608 	dprintk("%s: change attribute=%Lu\n", __func__,
2609 			(unsigned long long)*change);
2610 	return ret;
2611 out_overflow:
2612 	print_overflow_msg(__func__, xdr);
2613 	return -EIO;
2614 }
2615 
2616 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
2617 {
2618 	__be32 *p;
2619 	int ret = 0;
2620 
2621 	*size = 0;
2622 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
2623 		return -EIO;
2624 	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
2625 		p = xdr_inline_decode(xdr, 8);
2626 		if (unlikely(!p))
2627 			goto out_overflow;
2628 		xdr_decode_hyper(p, size);
2629 		bitmap[0] &= ~FATTR4_WORD0_SIZE;
2630 		ret = NFS_ATTR_FATTR_SIZE;
2631 	}
2632 	dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
2633 	return ret;
2634 out_overflow:
2635 	print_overflow_msg(__func__, xdr);
2636 	return -EIO;
2637 }
2638 
2639 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2640 {
2641 	__be32 *p;
2642 
2643 	*res = 0;
2644 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
2645 		return -EIO;
2646 	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
2647 		p = xdr_inline_decode(xdr, 4);
2648 		if (unlikely(!p))
2649 			goto out_overflow;
2650 		*res = be32_to_cpup(p);
2651 		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
2652 	}
2653 	dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
2654 	return 0;
2655 out_overflow:
2656 	print_overflow_msg(__func__, xdr);
2657 	return -EIO;
2658 }
2659 
2660 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2661 {
2662 	__be32 *p;
2663 
2664 	*res = 0;
2665 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
2666 		return -EIO;
2667 	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
2668 		p = xdr_inline_decode(xdr, 4);
2669 		if (unlikely(!p))
2670 			goto out_overflow;
2671 		*res = be32_to_cpup(p);
2672 		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
2673 	}
2674 	dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
2675 	return 0;
2676 out_overflow:
2677 	print_overflow_msg(__func__, xdr);
2678 	return -EIO;
2679 }
2680 
2681 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
2682 {
2683 	__be32 *p;
2684 	int ret = 0;
2685 
2686 	fsid->major = 0;
2687 	fsid->minor = 0;
2688 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
2689 		return -EIO;
2690 	if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
2691 		p = xdr_inline_decode(xdr, 16);
2692 		if (unlikely(!p))
2693 			goto out_overflow;
2694 		p = xdr_decode_hyper(p, &fsid->major);
2695 		xdr_decode_hyper(p, &fsid->minor);
2696 		bitmap[0] &= ~FATTR4_WORD0_FSID;
2697 		ret = NFS_ATTR_FATTR_FSID;
2698 	}
2699 	dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
2700 			(unsigned long long)fsid->major,
2701 			(unsigned long long)fsid->minor);
2702 	return ret;
2703 out_overflow:
2704 	print_overflow_msg(__func__, xdr);
2705 	return -EIO;
2706 }
2707 
2708 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2709 {
2710 	__be32 *p;
2711 
2712 	*res = 60;
2713 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
2714 		return -EIO;
2715 	if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
2716 		p = xdr_inline_decode(xdr, 4);
2717 		if (unlikely(!p))
2718 			goto out_overflow;
2719 		*res = be32_to_cpup(p);
2720 		bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
2721 	}
2722 	dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
2723 	return 0;
2724 out_overflow:
2725 	print_overflow_msg(__func__, xdr);
2726 	return -EIO;
2727 }
2728 
2729 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2730 {
2731 	__be32 *p;
2732 
2733 	*res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
2734 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
2735 		return -EIO;
2736 	if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
2737 		p = xdr_inline_decode(xdr, 4);
2738 		if (unlikely(!p))
2739 			goto out_overflow;
2740 		*res = be32_to_cpup(p);
2741 		bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
2742 	}
2743 	dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
2744 	return 0;
2745 out_overflow:
2746 	print_overflow_msg(__func__, xdr);
2747 	return -EIO;
2748 }
2749 
2750 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
2751 {
2752 	__be32 *p;
2753 	int ret = 0;
2754 
2755 	*fileid = 0;
2756 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
2757 		return -EIO;
2758 	if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
2759 		p = xdr_inline_decode(xdr, 8);
2760 		if (unlikely(!p))
2761 			goto out_overflow;
2762 		xdr_decode_hyper(p, fileid);
2763 		bitmap[0] &= ~FATTR4_WORD0_FILEID;
2764 		ret = NFS_ATTR_FATTR_FILEID;
2765 	}
2766 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
2767 	return ret;
2768 out_overflow:
2769 	print_overflow_msg(__func__, xdr);
2770 	return -EIO;
2771 }
2772 
2773 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
2774 {
2775 	__be32 *p;
2776 	int ret = 0;
2777 
2778 	*fileid = 0;
2779 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
2780 		return -EIO;
2781 	if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
2782 		p = xdr_inline_decode(xdr, 8);
2783 		if (unlikely(!p))
2784 			goto out_overflow;
2785 		xdr_decode_hyper(p, fileid);
2786 		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
2787 		ret = NFS_ATTR_FATTR_FILEID;
2788 	}
2789 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
2790 	return ret;
2791 out_overflow:
2792 	print_overflow_msg(__func__, xdr);
2793 	return -EIO;
2794 }
2795 
2796 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2797 {
2798 	__be32 *p;
2799 	int status = 0;
2800 
2801 	*res = 0;
2802 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
2803 		return -EIO;
2804 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
2805 		p = xdr_inline_decode(xdr, 8);
2806 		if (unlikely(!p))
2807 			goto out_overflow;
2808 		xdr_decode_hyper(p, res);
2809 		bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
2810 	}
2811 	dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
2812 	return status;
2813 out_overflow:
2814 	print_overflow_msg(__func__, xdr);
2815 	return -EIO;
2816 }
2817 
2818 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2819 {
2820 	__be32 *p;
2821 	int status = 0;
2822 
2823 	*res = 0;
2824 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
2825 		return -EIO;
2826 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
2827 		p = xdr_inline_decode(xdr, 8);
2828 		if (unlikely(!p))
2829 			goto out_overflow;
2830 		xdr_decode_hyper(p, res);
2831 		bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
2832 	}
2833 	dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
2834 	return status;
2835 out_overflow:
2836 	print_overflow_msg(__func__, xdr);
2837 	return -EIO;
2838 }
2839 
2840 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2841 {
2842 	__be32 *p;
2843 	int status = 0;
2844 
2845 	*res = 0;
2846 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
2847 		return -EIO;
2848 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
2849 		p = xdr_inline_decode(xdr, 8);
2850 		if (unlikely(!p))
2851 			goto out_overflow;
2852 		xdr_decode_hyper(p, res);
2853 		bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
2854 	}
2855 	dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
2856 	return status;
2857 out_overflow:
2858 	print_overflow_msg(__func__, xdr);
2859 	return -EIO;
2860 }
2861 
2862 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
2863 {
2864 	u32 n;
2865 	__be32 *p;
2866 	int status = 0;
2867 
2868 	p = xdr_inline_decode(xdr, 4);
2869 	if (unlikely(!p))
2870 		goto out_overflow;
2871 	n = be32_to_cpup(p);
2872 	if (n == 0)
2873 		goto root_path;
2874 	dprintk("path ");
2875 	path->ncomponents = 0;
2876 	while (path->ncomponents < n) {
2877 		struct nfs4_string *component = &path->components[path->ncomponents];
2878 		status = decode_opaque_inline(xdr, &component->len, &component->data);
2879 		if (unlikely(status != 0))
2880 			goto out_eio;
2881 		if (path->ncomponents != n)
2882 			dprintk("/");
2883 		dprintk("%s", component->data);
2884 		if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
2885 			path->ncomponents++;
2886 		else {
2887 			dprintk("cannot parse %d components in path\n", n);
2888 			goto out_eio;
2889 		}
2890 	}
2891 out:
2892 	dprintk("\n");
2893 	return status;
2894 root_path:
2895 /* a root pathname is sent as a zero component4 */
2896 	path->ncomponents = 1;
2897 	path->components[0].len=0;
2898 	path->components[0].data=NULL;
2899 	dprintk("path /\n");
2900 	goto out;
2901 out_eio:
2902 	dprintk(" status %d", status);
2903 	status = -EIO;
2904 	goto out;
2905 out_overflow:
2906 	print_overflow_msg(__func__, xdr);
2907 	return -EIO;
2908 }
2909 
2910 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
2911 {
2912 	int n;
2913 	__be32 *p;
2914 	int status = -EIO;
2915 
2916 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
2917 		goto out;
2918 	status = 0;
2919 	if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
2920 		goto out;
2921 	dprintk("%s: fsroot ", __func__);
2922 	status = decode_pathname(xdr, &res->fs_path);
2923 	if (unlikely(status != 0))
2924 		goto out;
2925 	p = xdr_inline_decode(xdr, 4);
2926 	if (unlikely(!p))
2927 		goto out_overflow;
2928 	n = be32_to_cpup(p);
2929 	if (n <= 0)
2930 		goto out_eio;
2931 	res->nlocations = 0;
2932 	while (res->nlocations < n) {
2933 		u32 m;
2934 		struct nfs4_fs_location *loc = &res->locations[res->nlocations];
2935 
2936 		p = xdr_inline_decode(xdr, 4);
2937 		if (unlikely(!p))
2938 			goto out_overflow;
2939 		m = be32_to_cpup(p);
2940 
2941 		loc->nservers = 0;
2942 		dprintk("%s: servers ", __func__);
2943 		while (loc->nservers < m) {
2944 			struct nfs4_string *server = &loc->servers[loc->nservers];
2945 			status = decode_opaque_inline(xdr, &server->len, &server->data);
2946 			if (unlikely(status != 0))
2947 				goto out_eio;
2948 			dprintk("%s ", server->data);
2949 			if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
2950 				loc->nservers++;
2951 			else {
2952 				unsigned int i;
2953 				dprintk("%s: using first %u of %u servers "
2954 					"returned for location %u\n",
2955 						__func__,
2956 						NFS4_FS_LOCATION_MAXSERVERS,
2957 						m, res->nlocations);
2958 				for (i = loc->nservers; i < m; i++) {
2959 					unsigned int len;
2960 					char *data;
2961 					status = decode_opaque_inline(xdr, &len, &data);
2962 					if (unlikely(status != 0))
2963 						goto out_eio;
2964 				}
2965 			}
2966 		}
2967 		status = decode_pathname(xdr, &loc->rootpath);
2968 		if (unlikely(status != 0))
2969 			goto out_eio;
2970 		if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
2971 			res->nlocations++;
2972 	}
2973 	if (res->nlocations != 0)
2974 		status = NFS_ATTR_FATTR_V4_REFERRAL;
2975 out:
2976 	dprintk("%s: fs_locations done, error = %d\n", __func__, status);
2977 	return status;
2978 out_overflow:
2979 	print_overflow_msg(__func__, xdr);
2980 out_eio:
2981 	status = -EIO;
2982 	goto out;
2983 }
2984 
2985 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2986 {
2987 	__be32 *p;
2988 	int status = 0;
2989 
2990 	*res = 0;
2991 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
2992 		return -EIO;
2993 	if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
2994 		p = xdr_inline_decode(xdr, 8);
2995 		if (unlikely(!p))
2996 			goto out_overflow;
2997 		xdr_decode_hyper(p, res);
2998 		bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
2999 	}
3000 	dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3001 	return status;
3002 out_overflow:
3003 	print_overflow_msg(__func__, xdr);
3004 	return -EIO;
3005 }
3006 
3007 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3008 {
3009 	__be32 *p;
3010 	int status = 0;
3011 
3012 	*maxlink = 1;
3013 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3014 		return -EIO;
3015 	if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3016 		p = xdr_inline_decode(xdr, 4);
3017 		if (unlikely(!p))
3018 			goto out_overflow;
3019 		*maxlink = be32_to_cpup(p);
3020 		bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3021 	}
3022 	dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3023 	return status;
3024 out_overflow:
3025 	print_overflow_msg(__func__, xdr);
3026 	return -EIO;
3027 }
3028 
3029 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3030 {
3031 	__be32 *p;
3032 	int status = 0;
3033 
3034 	*maxname = 1024;
3035 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3036 		return -EIO;
3037 	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3038 		p = xdr_inline_decode(xdr, 4);
3039 		if (unlikely(!p))
3040 			goto out_overflow;
3041 		*maxname = be32_to_cpup(p);
3042 		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3043 	}
3044 	dprintk("%s: maxname=%u\n", __func__, *maxname);
3045 	return status;
3046 out_overflow:
3047 	print_overflow_msg(__func__, xdr);
3048 	return -EIO;
3049 }
3050 
3051 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3052 {
3053 	__be32 *p;
3054 	int status = 0;
3055 
3056 	*res = 1024;
3057 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3058 		return -EIO;
3059 	if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3060 		uint64_t maxread;
3061 		p = xdr_inline_decode(xdr, 8);
3062 		if (unlikely(!p))
3063 			goto out_overflow;
3064 		xdr_decode_hyper(p, &maxread);
3065 		if (maxread > 0x7FFFFFFF)
3066 			maxread = 0x7FFFFFFF;
3067 		*res = (uint32_t)maxread;
3068 		bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3069 	}
3070 	dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3071 	return status;
3072 out_overflow:
3073 	print_overflow_msg(__func__, xdr);
3074 	return -EIO;
3075 }
3076 
3077 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3078 {
3079 	__be32 *p;
3080 	int status = 0;
3081 
3082 	*res = 1024;
3083 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3084 		return -EIO;
3085 	if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3086 		uint64_t maxwrite;
3087 		p = xdr_inline_decode(xdr, 8);
3088 		if (unlikely(!p))
3089 			goto out_overflow;
3090 		xdr_decode_hyper(p, &maxwrite);
3091 		if (maxwrite > 0x7FFFFFFF)
3092 			maxwrite = 0x7FFFFFFF;
3093 		*res = (uint32_t)maxwrite;
3094 		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3095 	}
3096 	dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3097 	return status;
3098 out_overflow:
3099 	print_overflow_msg(__func__, xdr);
3100 	return -EIO;
3101 }
3102 
3103 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3104 {
3105 	uint32_t tmp;
3106 	__be32 *p;
3107 	int ret = 0;
3108 
3109 	*mode = 0;
3110 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3111 		return -EIO;
3112 	if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3113 		p = xdr_inline_decode(xdr, 4);
3114 		if (unlikely(!p))
3115 			goto out_overflow;
3116 		tmp = be32_to_cpup(p);
3117 		*mode = tmp & ~S_IFMT;
3118 		bitmap[1] &= ~FATTR4_WORD1_MODE;
3119 		ret = NFS_ATTR_FATTR_MODE;
3120 	}
3121 	dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3122 	return ret;
3123 out_overflow:
3124 	print_overflow_msg(__func__, xdr);
3125 	return -EIO;
3126 }
3127 
3128 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3129 {
3130 	__be32 *p;
3131 	int ret = 0;
3132 
3133 	*nlink = 1;
3134 	if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3135 		return -EIO;
3136 	if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3137 		p = xdr_inline_decode(xdr, 4);
3138 		if (unlikely(!p))
3139 			goto out_overflow;
3140 		*nlink = be32_to_cpup(p);
3141 		bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3142 		ret = NFS_ATTR_FATTR_NLINK;
3143 	}
3144 	dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3145 	return ret;
3146 out_overflow:
3147 	print_overflow_msg(__func__, xdr);
3148 	return -EIO;
3149 }
3150 
3151 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3152 		struct nfs_client *clp, uint32_t *uid, int may_sleep)
3153 {
3154 	uint32_t len;
3155 	__be32 *p;
3156 	int ret = 0;
3157 
3158 	*uid = -2;
3159 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3160 		return -EIO;
3161 	if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3162 		p = xdr_inline_decode(xdr, 4);
3163 		if (unlikely(!p))
3164 			goto out_overflow;
3165 		len = be32_to_cpup(p);
3166 		p = xdr_inline_decode(xdr, len);
3167 		if (unlikely(!p))
3168 			goto out_overflow;
3169 		if (!may_sleep) {
3170 			/* do nothing */
3171 		} else if (len < XDR_MAX_NETOBJ) {
3172 			if (nfs_map_name_to_uid(clp, (char *)p, len, uid) == 0)
3173 				ret = NFS_ATTR_FATTR_OWNER;
3174 			else
3175 				dprintk("%s: nfs_map_name_to_uid failed!\n",
3176 						__func__);
3177 		} else
3178 			dprintk("%s: name too long (%u)!\n",
3179 					__func__, len);
3180 		bitmap[1] &= ~FATTR4_WORD1_OWNER;
3181 	}
3182 	dprintk("%s: uid=%d\n", __func__, (int)*uid);
3183 	return ret;
3184 out_overflow:
3185 	print_overflow_msg(__func__, xdr);
3186 	return -EIO;
3187 }
3188 
3189 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3190 		struct nfs_client *clp, uint32_t *gid, int may_sleep)
3191 {
3192 	uint32_t len;
3193 	__be32 *p;
3194 	int ret = 0;
3195 
3196 	*gid = -2;
3197 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3198 		return -EIO;
3199 	if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3200 		p = xdr_inline_decode(xdr, 4);
3201 		if (unlikely(!p))
3202 			goto out_overflow;
3203 		len = be32_to_cpup(p);
3204 		p = xdr_inline_decode(xdr, len);
3205 		if (unlikely(!p))
3206 			goto out_overflow;
3207 		if (!may_sleep) {
3208 			/* do nothing */
3209 		} else if (len < XDR_MAX_NETOBJ) {
3210 			if (nfs_map_group_to_gid(clp, (char *)p, len, gid) == 0)
3211 				ret = NFS_ATTR_FATTR_GROUP;
3212 			else
3213 				dprintk("%s: nfs_map_group_to_gid failed!\n",
3214 						__func__);
3215 		} else
3216 			dprintk("%s: name too long (%u)!\n",
3217 					__func__, len);
3218 		bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3219 	}
3220 	dprintk("%s: gid=%d\n", __func__, (int)*gid);
3221 	return ret;
3222 out_overflow:
3223 	print_overflow_msg(__func__, xdr);
3224 	return -EIO;
3225 }
3226 
3227 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3228 {
3229 	uint32_t major = 0, minor = 0;
3230 	__be32 *p;
3231 	int ret = 0;
3232 
3233 	*rdev = MKDEV(0,0);
3234 	if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3235 		return -EIO;
3236 	if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3237 		dev_t tmp;
3238 
3239 		p = xdr_inline_decode(xdr, 8);
3240 		if (unlikely(!p))
3241 			goto out_overflow;
3242 		major = be32_to_cpup(p++);
3243 		minor = be32_to_cpup(p);
3244 		tmp = MKDEV(major, minor);
3245 		if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3246 			*rdev = tmp;
3247 		bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3248 		ret = NFS_ATTR_FATTR_RDEV;
3249 	}
3250 	dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3251 	return ret;
3252 out_overflow:
3253 	print_overflow_msg(__func__, xdr);
3254 	return -EIO;
3255 }
3256 
3257 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3258 {
3259 	__be32 *p;
3260 	int status = 0;
3261 
3262 	*res = 0;
3263 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3264 		return -EIO;
3265 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3266 		p = xdr_inline_decode(xdr, 8);
3267 		if (unlikely(!p))
3268 			goto out_overflow;
3269 		xdr_decode_hyper(p, res);
3270 		bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3271 	}
3272 	dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3273 	return status;
3274 out_overflow:
3275 	print_overflow_msg(__func__, xdr);
3276 	return -EIO;
3277 }
3278 
3279 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3280 {
3281 	__be32 *p;
3282 	int status = 0;
3283 
3284 	*res = 0;
3285 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3286 		return -EIO;
3287 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3288 		p = xdr_inline_decode(xdr, 8);
3289 		if (unlikely(!p))
3290 			goto out_overflow;
3291 		xdr_decode_hyper(p, res);
3292 		bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3293 	}
3294 	dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3295 	return status;
3296 out_overflow:
3297 	print_overflow_msg(__func__, xdr);
3298 	return -EIO;
3299 }
3300 
3301 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3302 {
3303 	__be32 *p;
3304 	int status = 0;
3305 
3306 	*res = 0;
3307 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
3308 		return -EIO;
3309 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3310 		p = xdr_inline_decode(xdr, 8);
3311 		if (unlikely(!p))
3312 			goto out_overflow;
3313 		xdr_decode_hyper(p, res);
3314 		bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
3315 	}
3316 	dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
3317 	return status;
3318 out_overflow:
3319 	print_overflow_msg(__func__, xdr);
3320 	return -EIO;
3321 }
3322 
3323 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
3324 {
3325 	__be32 *p;
3326 	int ret = 0;
3327 
3328 	*used = 0;
3329 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
3330 		return -EIO;
3331 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
3332 		p = xdr_inline_decode(xdr, 8);
3333 		if (unlikely(!p))
3334 			goto out_overflow;
3335 		xdr_decode_hyper(p, used);
3336 		bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
3337 		ret = NFS_ATTR_FATTR_SPACE_USED;
3338 	}
3339 	dprintk("%s: space used=%Lu\n", __func__,
3340 			(unsigned long long)*used);
3341 	return ret;
3342 out_overflow:
3343 	print_overflow_msg(__func__, xdr);
3344 	return -EIO;
3345 }
3346 
3347 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
3348 {
3349 	__be32 *p;
3350 	uint64_t sec;
3351 	uint32_t nsec;
3352 
3353 	p = xdr_inline_decode(xdr, 12);
3354 	if (unlikely(!p))
3355 		goto out_overflow;
3356 	p = xdr_decode_hyper(p, &sec);
3357 	nsec = be32_to_cpup(p);
3358 	time->tv_sec = (time_t)sec;
3359 	time->tv_nsec = (long)nsec;
3360 	return 0;
3361 out_overflow:
3362 	print_overflow_msg(__func__, xdr);
3363 	return -EIO;
3364 }
3365 
3366 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3367 {
3368 	int status = 0;
3369 
3370 	time->tv_sec = 0;
3371 	time->tv_nsec = 0;
3372 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
3373 		return -EIO;
3374 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
3375 		status = decode_attr_time(xdr, time);
3376 		if (status == 0)
3377 			status = NFS_ATTR_FATTR_ATIME;
3378 		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
3379 	}
3380 	dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
3381 	return status;
3382 }
3383 
3384 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3385 {
3386 	int status = 0;
3387 
3388 	time->tv_sec = 0;
3389 	time->tv_nsec = 0;
3390 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
3391 		return -EIO;
3392 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
3393 		status = decode_attr_time(xdr, time);
3394 		if (status == 0)
3395 			status = NFS_ATTR_FATTR_CTIME;
3396 		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
3397 	}
3398 	dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
3399 	return status;
3400 }
3401 
3402 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
3403 {
3404 	int status = 0;
3405 
3406 	time->tv_sec = 0;
3407 	time->tv_nsec = 0;
3408 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
3409 		return -EIO;
3410 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
3411 		status = decode_attr_time(xdr, time);
3412 		if (status == 0)
3413 			status = NFS_ATTR_FATTR_MTIME;
3414 		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
3415 	}
3416 	dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
3417 	return status;
3418 }
3419 
3420 static int verify_attr_len(struct xdr_stream *xdr, __be32 *savep, uint32_t attrlen)
3421 {
3422 	unsigned int attrwords = XDR_QUADLEN(attrlen);
3423 	unsigned int nwords = xdr->p - savep;
3424 
3425 	if (unlikely(attrwords != nwords)) {
3426 		dprintk("%s: server returned incorrect attribute length: "
3427 			"%u %c %u\n",
3428 				__func__,
3429 				attrwords << 2,
3430 				(attrwords < nwords) ? '<' : '>',
3431 				nwords << 2);
3432 		return -EIO;
3433 	}
3434 	return 0;
3435 }
3436 
3437 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3438 {
3439 	__be32 *p;
3440 
3441 	p = xdr_inline_decode(xdr, 20);
3442 	if (unlikely(!p))
3443 		goto out_overflow;
3444 	cinfo->atomic = be32_to_cpup(p++);
3445 	p = xdr_decode_hyper(p, &cinfo->before);
3446 	xdr_decode_hyper(p, &cinfo->after);
3447 	return 0;
3448 out_overflow:
3449 	print_overflow_msg(__func__, xdr);
3450 	return -EIO;
3451 }
3452 
3453 static int decode_access(struct xdr_stream *xdr, struct nfs4_accessres *access)
3454 {
3455 	__be32 *p;
3456 	uint32_t supp, acc;
3457 	int status;
3458 
3459 	status = decode_op_hdr(xdr, OP_ACCESS);
3460 	if (status)
3461 		return status;
3462 	p = xdr_inline_decode(xdr, 8);
3463 	if (unlikely(!p))
3464 		goto out_overflow;
3465 	supp = be32_to_cpup(p++);
3466 	acc = be32_to_cpup(p);
3467 	access->supported = supp;
3468 	access->access = acc;
3469 	return 0;
3470 out_overflow:
3471 	print_overflow_msg(__func__, xdr);
3472 	return -EIO;
3473 }
3474 
3475 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
3476 {
3477 	__be32 *p;
3478 
3479 	p = xdr_inline_decode(xdr, len);
3480 	if (likely(p)) {
3481 		memcpy(buf, p, len);
3482 		return 0;
3483 	}
3484 	print_overflow_msg(__func__, xdr);
3485 	return -EIO;
3486 }
3487 
3488 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
3489 {
3490 	return decode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
3491 }
3492 
3493 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
3494 {
3495 	int status;
3496 
3497 	status = decode_op_hdr(xdr, OP_CLOSE);
3498 	if (status != -EIO)
3499 		nfs_increment_open_seqid(status, res->seqid);
3500 	if (!status)
3501 		status = decode_stateid(xdr, &res->stateid);
3502 	return status;
3503 }
3504 
3505 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
3506 {
3507 	return decode_opaque_fixed(xdr, verifier, 8);
3508 }
3509 
3510 static int decode_commit(struct xdr_stream *xdr, struct nfs_writeres *res)
3511 {
3512 	int status;
3513 
3514 	status = decode_op_hdr(xdr, OP_COMMIT);
3515 	if (!status)
3516 		status = decode_verifier(xdr, res->verf->verifier);
3517 	return status;
3518 }
3519 
3520 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3521 {
3522 	__be32 *p;
3523 	uint32_t bmlen;
3524 	int status;
3525 
3526 	status = decode_op_hdr(xdr, OP_CREATE);
3527 	if (status)
3528 		return status;
3529 	if ((status = decode_change_info(xdr, cinfo)))
3530 		return status;
3531 	p = xdr_inline_decode(xdr, 4);
3532 	if (unlikely(!p))
3533 		goto out_overflow;
3534 	bmlen = be32_to_cpup(p);
3535 	p = xdr_inline_decode(xdr, bmlen << 2);
3536 	if (likely(p))
3537 		return 0;
3538 out_overflow:
3539 	print_overflow_msg(__func__, xdr);
3540 	return -EIO;
3541 }
3542 
3543 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
3544 {
3545 	__be32 *savep;
3546 	uint32_t attrlen, bitmap[2] = {0};
3547 	int status;
3548 
3549 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3550 		goto xdr_error;
3551 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3552 		goto xdr_error;
3553 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3554 		goto xdr_error;
3555 	if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
3556 		goto xdr_error;
3557 	if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
3558 		goto xdr_error;
3559 	if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
3560 		goto xdr_error;
3561 	if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
3562 		goto xdr_error;
3563 	status = verify_attr_len(xdr, savep, attrlen);
3564 xdr_error:
3565 	dprintk("%s: xdr returned %d!\n", __func__, -status);
3566 	return status;
3567 }
3568 
3569 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
3570 {
3571 	__be32 *savep;
3572 	uint32_t attrlen, bitmap[2] = {0};
3573 	int status;
3574 
3575 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3576 		goto xdr_error;
3577 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3578 		goto xdr_error;
3579 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3580 		goto xdr_error;
3581 
3582 	if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
3583 		goto xdr_error;
3584 	if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
3585 		goto xdr_error;
3586 	if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
3587 		goto xdr_error;
3588 	if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
3589 		goto xdr_error;
3590 	if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
3591 		goto xdr_error;
3592 	if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
3593 		goto xdr_error;
3594 
3595 	status = verify_attr_len(xdr, savep, attrlen);
3596 xdr_error:
3597 	dprintk("%s: xdr returned %d!\n", __func__, -status);
3598 	return status;
3599 }
3600 
3601 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
3602 {
3603 	__be32 *savep;
3604 	uint32_t attrlen, bitmap[2] = {0};
3605 	int status;
3606 
3607 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3608 		goto xdr_error;
3609 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3610 		goto xdr_error;
3611 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3612 		goto xdr_error;
3613 
3614 	if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
3615 		goto xdr_error;
3616 	if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
3617 		goto xdr_error;
3618 
3619 	status = verify_attr_len(xdr, savep, attrlen);
3620 xdr_error:
3621 	dprintk("%s: xdr returned %d!\n", __func__, -status);
3622 	return status;
3623 }
3624 
3625 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
3626 		const struct nfs_server *server, int may_sleep)
3627 {
3628 	__be32 *savep;
3629 	uint32_t attrlen,
3630 		 bitmap[2] = {0},
3631 		 type;
3632 	int status;
3633 	umode_t fmode = 0;
3634 	uint64_t fileid;
3635 
3636 	status = decode_op_hdr(xdr, OP_GETATTR);
3637 	if (status < 0)
3638 		goto xdr_error;
3639 
3640 	status = decode_attr_bitmap(xdr, bitmap);
3641 	if (status < 0)
3642 		goto xdr_error;
3643 
3644 	status = decode_attr_length(xdr, &attrlen, &savep);
3645 	if (status < 0)
3646 		goto xdr_error;
3647 
3648 
3649 	status = decode_attr_type(xdr, bitmap, &type);
3650 	if (status < 0)
3651 		goto xdr_error;
3652 	fattr->mode = 0;
3653 	if (status != 0) {
3654 		fattr->mode |= nfs_type2fmt[type];
3655 		fattr->valid |= status;
3656 	}
3657 
3658 	status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
3659 	if (status < 0)
3660 		goto xdr_error;
3661 	fattr->valid |= status;
3662 
3663 	status = decode_attr_size(xdr, bitmap, &fattr->size);
3664 	if (status < 0)
3665 		goto xdr_error;
3666 	fattr->valid |= status;
3667 
3668 	status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
3669 	if (status < 0)
3670 		goto xdr_error;
3671 	fattr->valid |= status;
3672 
3673 	status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
3674 	if (status < 0)
3675 		goto xdr_error;
3676 	fattr->valid |= status;
3677 
3678 	status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
3679 						struct nfs4_fs_locations,
3680 						fattr));
3681 	if (status < 0)
3682 		goto xdr_error;
3683 	fattr->valid |= status;
3684 
3685 	status = decode_attr_mode(xdr, bitmap, &fmode);
3686 	if (status < 0)
3687 		goto xdr_error;
3688 	if (status != 0) {
3689 		fattr->mode |= fmode;
3690 		fattr->valid |= status;
3691 	}
3692 
3693 	status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
3694 	if (status < 0)
3695 		goto xdr_error;
3696 	fattr->valid |= status;
3697 
3698 	status = decode_attr_owner(xdr, bitmap, server->nfs_client,
3699 			&fattr->uid, may_sleep);
3700 	if (status < 0)
3701 		goto xdr_error;
3702 	fattr->valid |= status;
3703 
3704 	status = decode_attr_group(xdr, bitmap, server->nfs_client,
3705 			&fattr->gid, may_sleep);
3706 	if (status < 0)
3707 		goto xdr_error;
3708 	fattr->valid |= status;
3709 
3710 	status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
3711 	if (status < 0)
3712 		goto xdr_error;
3713 	fattr->valid |= status;
3714 
3715 	status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
3716 	if (status < 0)
3717 		goto xdr_error;
3718 	fattr->valid |= status;
3719 
3720 	status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
3721 	if (status < 0)
3722 		goto xdr_error;
3723 	fattr->valid |= status;
3724 
3725 	status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
3726 	if (status < 0)
3727 		goto xdr_error;
3728 	fattr->valid |= status;
3729 
3730 	status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
3731 	if (status < 0)
3732 		goto xdr_error;
3733 	fattr->valid |= status;
3734 
3735 	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid);
3736 	if (status < 0)
3737 		goto xdr_error;
3738 	if (status != 0 && !(fattr->valid & status)) {
3739 		fattr->fileid = fileid;
3740 		fattr->valid |= status;
3741 	}
3742 
3743 	status = verify_attr_len(xdr, savep, attrlen);
3744 xdr_error:
3745 	dprintk("%s: xdr returned %d\n", __func__, -status);
3746 	return status;
3747 }
3748 
3749 
3750 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
3751 {
3752 	__be32 *savep;
3753 	uint32_t attrlen, bitmap[2];
3754 	int status;
3755 
3756 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3757 		goto xdr_error;
3758 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3759 		goto xdr_error;
3760 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3761 		goto xdr_error;
3762 
3763 	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */
3764 
3765 	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
3766 		goto xdr_error;
3767 	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
3768 		goto xdr_error;
3769 	if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
3770 		goto xdr_error;
3771 	fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
3772 	if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
3773 		goto xdr_error;
3774 	fsinfo->wtpref = fsinfo->wtmax;
3775 
3776 	status = verify_attr_len(xdr, savep, attrlen);
3777 xdr_error:
3778 	dprintk("%s: xdr returned %d!\n", __func__, -status);
3779 	return status;
3780 }
3781 
3782 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
3783 {
3784 	__be32 *p;
3785 	uint32_t len;
3786 	int status;
3787 
3788 	/* Zero handle first to allow comparisons */
3789 	memset(fh, 0, sizeof(*fh));
3790 
3791 	status = decode_op_hdr(xdr, OP_GETFH);
3792 	if (status)
3793 		return status;
3794 
3795 	p = xdr_inline_decode(xdr, 4);
3796 	if (unlikely(!p))
3797 		goto out_overflow;
3798 	len = be32_to_cpup(p);
3799 	if (len > NFS4_FHSIZE)
3800 		return -EIO;
3801 	fh->size = len;
3802 	p = xdr_inline_decode(xdr, len);
3803 	if (unlikely(!p))
3804 		goto out_overflow;
3805 	memcpy(fh->data, p, len);
3806 	return 0;
3807 out_overflow:
3808 	print_overflow_msg(__func__, xdr);
3809 	return -EIO;
3810 }
3811 
3812 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3813 {
3814 	int status;
3815 
3816 	status = decode_op_hdr(xdr, OP_LINK);
3817 	if (status)
3818 		return status;
3819 	return decode_change_info(xdr, cinfo);
3820 }
3821 
3822 /*
3823  * We create the owner, so we know a proper owner.id length is 4.
3824  */
3825 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
3826 {
3827 	uint64_t offset, length, clientid;
3828 	__be32 *p;
3829 	uint32_t namelen, type;
3830 
3831 	p = xdr_inline_decode(xdr, 32);
3832 	if (unlikely(!p))
3833 		goto out_overflow;
3834 	p = xdr_decode_hyper(p, &offset);
3835 	p = xdr_decode_hyper(p, &length);
3836 	type = be32_to_cpup(p++);
3837 	if (fl != NULL) {
3838 		fl->fl_start = (loff_t)offset;
3839 		fl->fl_end = fl->fl_start + (loff_t)length - 1;
3840 		if (length == ~(uint64_t)0)
3841 			fl->fl_end = OFFSET_MAX;
3842 		fl->fl_type = F_WRLCK;
3843 		if (type & 1)
3844 			fl->fl_type = F_RDLCK;
3845 		fl->fl_pid = 0;
3846 	}
3847 	p = xdr_decode_hyper(p, &clientid);
3848 	namelen = be32_to_cpup(p);
3849 	p = xdr_inline_decode(xdr, namelen);
3850 	if (likely(p))
3851 		return -NFS4ERR_DENIED;
3852 out_overflow:
3853 	print_overflow_msg(__func__, xdr);
3854 	return -EIO;
3855 }
3856 
3857 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
3858 {
3859 	int status;
3860 
3861 	status = decode_op_hdr(xdr, OP_LOCK);
3862 	if (status == -EIO)
3863 		goto out;
3864 	if (status == 0) {
3865 		status = decode_stateid(xdr, &res->stateid);
3866 		if (unlikely(status))
3867 			goto out;
3868 	} else if (status == -NFS4ERR_DENIED)
3869 		status = decode_lock_denied(xdr, NULL);
3870 	if (res->open_seqid != NULL)
3871 		nfs_increment_open_seqid(status, res->open_seqid);
3872 	nfs_increment_lock_seqid(status, res->lock_seqid);
3873 out:
3874 	return status;
3875 }
3876 
3877 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
3878 {
3879 	int status;
3880 	status = decode_op_hdr(xdr, OP_LOCKT);
3881 	if (status == -NFS4ERR_DENIED)
3882 		return decode_lock_denied(xdr, res->denied);
3883 	return status;
3884 }
3885 
3886 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
3887 {
3888 	int status;
3889 
3890 	status = decode_op_hdr(xdr, OP_LOCKU);
3891 	if (status != -EIO)
3892 		nfs_increment_lock_seqid(status, res->seqid);
3893 	if (status == 0)
3894 		status = decode_stateid(xdr, &res->stateid);
3895 	return status;
3896 }
3897 
3898 static int decode_lookup(struct xdr_stream *xdr)
3899 {
3900 	return decode_op_hdr(xdr, OP_LOOKUP);
3901 }
3902 
3903 /* This is too sick! */
3904 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
3905 {
3906 	__be32 *p;
3907 	uint32_t limit_type, nblocks, blocksize;
3908 
3909 	p = xdr_inline_decode(xdr, 12);
3910 	if (unlikely(!p))
3911 		goto out_overflow;
3912 	limit_type = be32_to_cpup(p++);
3913 	switch (limit_type) {
3914 	case 1:
3915 		xdr_decode_hyper(p, maxsize);
3916 		break;
3917 	case 2:
3918 		nblocks = be32_to_cpup(p++);
3919 		blocksize = be32_to_cpup(p);
3920 		*maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
3921 	}
3922 	return 0;
3923 out_overflow:
3924 	print_overflow_msg(__func__, xdr);
3925 	return -EIO;
3926 }
3927 
3928 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
3929 {
3930 	__be32 *p;
3931 	uint32_t delegation_type;
3932 	int status;
3933 
3934 	p = xdr_inline_decode(xdr, 4);
3935 	if (unlikely(!p))
3936 		goto out_overflow;
3937 	delegation_type = be32_to_cpup(p);
3938 	if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
3939 		res->delegation_type = 0;
3940 		return 0;
3941 	}
3942 	status = decode_stateid(xdr, &res->delegation);
3943 	if (unlikely(status))
3944 		return status;
3945 	p = xdr_inline_decode(xdr, 4);
3946 	if (unlikely(!p))
3947 		goto out_overflow;
3948 	res->do_recall = be32_to_cpup(p);
3949 
3950 	switch (delegation_type) {
3951 	case NFS4_OPEN_DELEGATE_READ:
3952 		res->delegation_type = FMODE_READ;
3953 		break;
3954 	case NFS4_OPEN_DELEGATE_WRITE:
3955 		res->delegation_type = FMODE_WRITE|FMODE_READ;
3956 		if (decode_space_limit(xdr, &res->maxsize) < 0)
3957 				return -EIO;
3958 	}
3959 	return decode_ace(xdr, NULL, res->server->nfs_client);
3960 out_overflow:
3961 	print_overflow_msg(__func__, xdr);
3962 	return -EIO;
3963 }
3964 
3965 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
3966 {
3967 	__be32 *p;
3968 	uint32_t savewords, bmlen, i;
3969 	int status;
3970 
3971 	status = decode_op_hdr(xdr, OP_OPEN);
3972 	if (status != -EIO)
3973 		nfs_increment_open_seqid(status, res->seqid);
3974 	if (!status)
3975 		status = decode_stateid(xdr, &res->stateid);
3976 	if (unlikely(status))
3977 		return status;
3978 
3979 	decode_change_info(xdr, &res->cinfo);
3980 
3981 	p = xdr_inline_decode(xdr, 8);
3982 	if (unlikely(!p))
3983 		goto out_overflow;
3984 	res->rflags = be32_to_cpup(p++);
3985 	bmlen = be32_to_cpup(p);
3986 	if (bmlen > 10)
3987 		goto xdr_error;
3988 
3989 	p = xdr_inline_decode(xdr, bmlen << 2);
3990 	if (unlikely(!p))
3991 		goto out_overflow;
3992 	savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
3993 	for (i = 0; i < savewords; ++i)
3994 		res->attrset[i] = be32_to_cpup(p++);
3995 	for (; i < NFS4_BITMAP_SIZE; i++)
3996 		res->attrset[i] = 0;
3997 
3998 	return decode_delegation(xdr, res);
3999 xdr_error:
4000 	dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
4001 	return -EIO;
4002 out_overflow:
4003 	print_overflow_msg(__func__, xdr);
4004 	return -EIO;
4005 }
4006 
4007 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
4008 {
4009 	int status;
4010 
4011 	status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
4012 	if (status != -EIO)
4013 		nfs_increment_open_seqid(status, res->seqid);
4014 	if (!status)
4015 		status = decode_stateid(xdr, &res->stateid);
4016 	return status;
4017 }
4018 
4019 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
4020 {
4021 	int status;
4022 
4023 	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
4024 	if (status != -EIO)
4025 		nfs_increment_open_seqid(status, res->seqid);
4026 	if (!status)
4027 		status = decode_stateid(xdr, &res->stateid);
4028 	return status;
4029 }
4030 
4031 static int decode_putfh(struct xdr_stream *xdr)
4032 {
4033 	return decode_op_hdr(xdr, OP_PUTFH);
4034 }
4035 
4036 static int decode_putrootfh(struct xdr_stream *xdr)
4037 {
4038 	return decode_op_hdr(xdr, OP_PUTROOTFH);
4039 }
4040 
4041 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
4042 {
4043 	struct kvec *iov = req->rq_rcv_buf.head;
4044 	__be32 *p;
4045 	uint32_t count, eof, recvd, hdrlen;
4046 	int status;
4047 
4048 	status = decode_op_hdr(xdr, OP_READ);
4049 	if (status)
4050 		return status;
4051 	p = xdr_inline_decode(xdr, 8);
4052 	if (unlikely(!p))
4053 		goto out_overflow;
4054 	eof = be32_to_cpup(p++);
4055 	count = be32_to_cpup(p);
4056 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
4057 	recvd = req->rq_rcv_buf.len - hdrlen;
4058 	if (count > recvd) {
4059 		dprintk("NFS: server cheating in read reply: "
4060 				"count %u > recvd %u\n", count, recvd);
4061 		count = recvd;
4062 		eof = 0;
4063 	}
4064 	xdr_read_pages(xdr, count);
4065 	res->eof = eof;
4066 	res->count = count;
4067 	return 0;
4068 out_overflow:
4069 	print_overflow_msg(__func__, xdr);
4070 	return -EIO;
4071 }
4072 
4073 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
4074 {
4075 	struct xdr_buf	*rcvbuf = &req->rq_rcv_buf;
4076 	struct page	*page = *rcvbuf->pages;
4077 	struct kvec	*iov = rcvbuf->head;
4078 	size_t		hdrlen;
4079 	u32		recvd, pglen = rcvbuf->page_len;
4080 	__be32		*end, *entry, *p, *kaddr;
4081 	unsigned int	nr = 0;
4082 	int		status;
4083 
4084 	status = decode_op_hdr(xdr, OP_READDIR);
4085 	if (!status)
4086 		status = decode_verifier(xdr, readdir->verifier.data);
4087 	if (unlikely(status))
4088 		return status;
4089 	dprintk("%s: verifier = %08x:%08x\n",
4090 			__func__,
4091 			((u32 *)readdir->verifier.data)[0],
4092 			((u32 *)readdir->verifier.data)[1]);
4093 
4094 
4095 	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4096 	recvd = rcvbuf->len - hdrlen;
4097 	if (pglen > recvd)
4098 		pglen = recvd;
4099 	xdr_read_pages(xdr, pglen);
4100 
4101 	BUG_ON(pglen + readdir->pgbase > PAGE_CACHE_SIZE);
4102 	kaddr = p = kmap_atomic(page, KM_USER0);
4103 	end = p + ((pglen + readdir->pgbase) >> 2);
4104 	entry = p;
4105 
4106 	/* Make sure the packet actually has a value_follows and EOF entry */
4107 	if ((entry + 1) > end)
4108 		goto short_pkt;
4109 
4110 	for (; *p++; nr++) {
4111 		u32 len, attrlen, xlen;
4112 		if (end - p < 3)
4113 			goto short_pkt;
4114 		dprintk("cookie = %Lu, ", *((unsigned long long *)p));
4115 		p += 2;			/* cookie */
4116 		len = ntohl(*p++);	/* filename length */
4117 		if (len > NFS4_MAXNAMLEN) {
4118 			dprintk("NFS: giant filename in readdir (len 0x%x)\n",
4119 					len);
4120 			goto err_unmap;
4121 		}
4122 		xlen = XDR_QUADLEN(len);
4123 		if (end - p < xlen + 1)
4124 			goto short_pkt;
4125 		dprintk("filename = %*s\n", len, (char *)p);
4126 		p += xlen;
4127 		len = ntohl(*p++);	/* bitmap length */
4128 		if (end - p < len + 1)
4129 			goto short_pkt;
4130 		p += len;
4131 		attrlen = XDR_QUADLEN(ntohl(*p++));
4132 		if (end - p < attrlen + 2)
4133 			goto short_pkt;
4134 		p += attrlen;		/* attributes */
4135 		entry = p;
4136 	}
4137 	/*
4138 	 * Apparently some server sends responses that are a valid size, but
4139 	 * contain no entries, and have value_follows==0 and EOF==0. For
4140 	 * those, just set the EOF marker.
4141 	 */
4142 	if (!nr && entry[1] == 0) {
4143 		dprintk("NFS: readdir reply truncated!\n");
4144 		entry[1] = 1;
4145 	}
4146 out:
4147 	kunmap_atomic(kaddr, KM_USER0);
4148 	return 0;
4149 short_pkt:
4150 	/*
4151 	 * When we get a short packet there are 2 possibilities. We can
4152 	 * return an error, or fix up the response to look like a valid
4153 	 * response and return what we have so far. If there are no
4154 	 * entries and the packet was short, then return -EIO. If there
4155 	 * are valid entries in the response, return them and pretend that
4156 	 * the call was successful, but incomplete. The caller can retry the
4157 	 * readdir starting at the last cookie.
4158 	 */
4159 	dprintk("%s: short packet at entry %d\n", __func__, nr);
4160 	entry[0] = entry[1] = 0;
4161 	if (nr)
4162 		goto out;
4163 err_unmap:
4164 	kunmap_atomic(kaddr, KM_USER0);
4165 	return -errno_NFSERR_IO;
4166 }
4167 
4168 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
4169 {
4170 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
4171 	struct kvec *iov = rcvbuf->head;
4172 	size_t hdrlen;
4173 	u32 len, recvd;
4174 	__be32 *p;
4175 	char *kaddr;
4176 	int status;
4177 
4178 	status = decode_op_hdr(xdr, OP_READLINK);
4179 	if (status)
4180 		return status;
4181 
4182 	/* Convert length of symlink */
4183 	p = xdr_inline_decode(xdr, 4);
4184 	if (unlikely(!p))
4185 		goto out_overflow;
4186 	len = be32_to_cpup(p);
4187 	if (len >= rcvbuf->page_len || len <= 0) {
4188 		dprintk("nfs: server returned giant symlink!\n");
4189 		return -ENAMETOOLONG;
4190 	}
4191 	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4192 	recvd = req->rq_rcv_buf.len - hdrlen;
4193 	if (recvd < len) {
4194 		dprintk("NFS: server cheating in readlink reply: "
4195 				"count %u > recvd %u\n", len, recvd);
4196 		return -EIO;
4197 	}
4198 	xdr_read_pages(xdr, len);
4199 	/*
4200 	 * The XDR encode routine has set things up so that
4201 	 * the link text will be copied directly into the
4202 	 * buffer.  We just have to do overflow-checking,
4203 	 * and and null-terminate the text (the VFS expects
4204 	 * null-termination).
4205 	 */
4206 	kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
4207 	kaddr[len+rcvbuf->page_base] = '\0';
4208 	kunmap_atomic(kaddr, KM_USER0);
4209 	return 0;
4210 out_overflow:
4211 	print_overflow_msg(__func__, xdr);
4212 	return -EIO;
4213 }
4214 
4215 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4216 {
4217 	int status;
4218 
4219 	status = decode_op_hdr(xdr, OP_REMOVE);
4220 	if (status)
4221 		goto out;
4222 	status = decode_change_info(xdr, cinfo);
4223 out:
4224 	return status;
4225 }
4226 
4227 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
4228 	      struct nfs4_change_info *new_cinfo)
4229 {
4230 	int status;
4231 
4232 	status = decode_op_hdr(xdr, OP_RENAME);
4233 	if (status)
4234 		goto out;
4235 	if ((status = decode_change_info(xdr, old_cinfo)))
4236 		goto out;
4237 	status = decode_change_info(xdr, new_cinfo);
4238 out:
4239 	return status;
4240 }
4241 
4242 static int decode_renew(struct xdr_stream *xdr)
4243 {
4244 	return decode_op_hdr(xdr, OP_RENEW);
4245 }
4246 
4247 static int
4248 decode_restorefh(struct xdr_stream *xdr)
4249 {
4250 	return decode_op_hdr(xdr, OP_RESTOREFH);
4251 }
4252 
4253 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
4254 		size_t *acl_len)
4255 {
4256 	__be32 *savep;
4257 	uint32_t attrlen,
4258 		 bitmap[2] = {0};
4259 	struct kvec *iov = req->rq_rcv_buf.head;
4260 	int status;
4261 
4262 	*acl_len = 0;
4263 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4264 		goto out;
4265 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4266 		goto out;
4267 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4268 		goto out;
4269 
4270 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
4271 		return -EIO;
4272 	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
4273 		size_t hdrlen;
4274 		u32 recvd;
4275 
4276 		/* We ignore &savep and don't do consistency checks on
4277 		 * the attr length.  Let userspace figure it out.... */
4278 		hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
4279 		recvd = req->rq_rcv_buf.len - hdrlen;
4280 		if (attrlen > recvd) {
4281 			dprintk("NFS: server cheating in getattr"
4282 					" acl reply: attrlen %u > recvd %u\n",
4283 					attrlen, recvd);
4284 			return -EINVAL;
4285 		}
4286 		xdr_read_pages(xdr, attrlen);
4287 		*acl_len = attrlen;
4288 	} else
4289 		status = -EOPNOTSUPP;
4290 
4291 out:
4292 	return status;
4293 }
4294 
4295 static int
4296 decode_savefh(struct xdr_stream *xdr)
4297 {
4298 	return decode_op_hdr(xdr, OP_SAVEFH);
4299 }
4300 
4301 static int decode_setattr(struct xdr_stream *xdr)
4302 {
4303 	__be32 *p;
4304 	uint32_t bmlen;
4305 	int status;
4306 
4307 	status = decode_op_hdr(xdr, OP_SETATTR);
4308 	if (status)
4309 		return status;
4310 	p = xdr_inline_decode(xdr, 4);
4311 	if (unlikely(!p))
4312 		goto out_overflow;
4313 	bmlen = be32_to_cpup(p);
4314 	p = xdr_inline_decode(xdr, bmlen << 2);
4315 	if (likely(p))
4316 		return 0;
4317 out_overflow:
4318 	print_overflow_msg(__func__, xdr);
4319 	return -EIO;
4320 }
4321 
4322 static int decode_setclientid(struct xdr_stream *xdr, struct nfs_client *clp)
4323 {
4324 	__be32 *p;
4325 	uint32_t opnum;
4326 	int32_t nfserr;
4327 
4328 	p = xdr_inline_decode(xdr, 8);
4329 	if (unlikely(!p))
4330 		goto out_overflow;
4331 	opnum = be32_to_cpup(p++);
4332 	if (opnum != OP_SETCLIENTID) {
4333 		dprintk("nfs: decode_setclientid: Server returned operation"
4334 			" %d\n", opnum);
4335 		return -EIO;
4336 	}
4337 	nfserr = be32_to_cpup(p);
4338 	if (nfserr == NFS_OK) {
4339 		p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
4340 		if (unlikely(!p))
4341 			goto out_overflow;
4342 		p = xdr_decode_hyper(p, &clp->cl_clientid);
4343 		memcpy(clp->cl_confirm.data, p, NFS4_VERIFIER_SIZE);
4344 	} else if (nfserr == NFSERR_CLID_INUSE) {
4345 		uint32_t len;
4346 
4347 		/* skip netid string */
4348 		p = xdr_inline_decode(xdr, 4);
4349 		if (unlikely(!p))
4350 			goto out_overflow;
4351 		len = be32_to_cpup(p);
4352 		p = xdr_inline_decode(xdr, len);
4353 		if (unlikely(!p))
4354 			goto out_overflow;
4355 
4356 		/* skip uaddr string */
4357 		p = xdr_inline_decode(xdr, 4);
4358 		if (unlikely(!p))
4359 			goto out_overflow;
4360 		len = be32_to_cpup(p);
4361 		p = xdr_inline_decode(xdr, len);
4362 		if (unlikely(!p))
4363 			goto out_overflow;
4364 		return -NFSERR_CLID_INUSE;
4365 	} else
4366 		return nfs4_stat_to_errno(nfserr);
4367 
4368 	return 0;
4369 out_overflow:
4370 	print_overflow_msg(__func__, xdr);
4371 	return -EIO;
4372 }
4373 
4374 static int decode_setclientid_confirm(struct xdr_stream *xdr)
4375 {
4376 	return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
4377 }
4378 
4379 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
4380 {
4381 	__be32 *p;
4382 	int status;
4383 
4384 	status = decode_op_hdr(xdr, OP_WRITE);
4385 	if (status)
4386 		return status;
4387 
4388 	p = xdr_inline_decode(xdr, 16);
4389 	if (unlikely(!p))
4390 		goto out_overflow;
4391 	res->count = be32_to_cpup(p++);
4392 	res->verf->committed = be32_to_cpup(p++);
4393 	memcpy(res->verf->verifier, p, 8);
4394 	return 0;
4395 out_overflow:
4396 	print_overflow_msg(__func__, xdr);
4397 	return -EIO;
4398 }
4399 
4400 static int decode_delegreturn(struct xdr_stream *xdr)
4401 {
4402 	return decode_op_hdr(xdr, OP_DELEGRETURN);
4403 }
4404 
4405 #if defined(CONFIG_NFS_V4_1)
4406 static int decode_exchange_id(struct xdr_stream *xdr,
4407 			      struct nfs41_exchange_id_res *res)
4408 {
4409 	__be32 *p;
4410 	uint32_t dummy;
4411 	char *dummy_str;
4412 	int status;
4413 	struct nfs_client *clp = res->client;
4414 
4415 	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
4416 	if (status)
4417 		return status;
4418 
4419 	p = xdr_inline_decode(xdr, 8);
4420 	if (unlikely(!p))
4421 		goto out_overflow;
4422 	xdr_decode_hyper(p, &clp->cl_ex_clid);
4423 	p = xdr_inline_decode(xdr, 12);
4424 	if (unlikely(!p))
4425 		goto out_overflow;
4426 	clp->cl_seqid = be32_to_cpup(p++);
4427 	clp->cl_exchange_flags = be32_to_cpup(p++);
4428 
4429 	/* We ask for SP4_NONE */
4430 	dummy = be32_to_cpup(p);
4431 	if (dummy != SP4_NONE)
4432 		return -EIO;
4433 
4434 	/* Throw away minor_id */
4435 	p = xdr_inline_decode(xdr, 8);
4436 	if (unlikely(!p))
4437 		goto out_overflow;
4438 
4439 	/* Throw away Major id */
4440 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4441 	if (unlikely(status))
4442 		return status;
4443 
4444 	/* Throw away server_scope */
4445 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4446 	if (unlikely(status))
4447 		return status;
4448 
4449 	/* Throw away Implementation id array */
4450 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
4451 	if (unlikely(status))
4452 		return status;
4453 
4454 	return 0;
4455 out_overflow:
4456 	print_overflow_msg(__func__, xdr);
4457 	return -EIO;
4458 }
4459 
4460 static int decode_chan_attrs(struct xdr_stream *xdr,
4461 			     struct nfs4_channel_attrs *attrs)
4462 {
4463 	__be32 *p;
4464 	u32 nr_attrs;
4465 
4466 	p = xdr_inline_decode(xdr, 28);
4467 	if (unlikely(!p))
4468 		goto out_overflow;
4469 	attrs->headerpadsz = be32_to_cpup(p++);
4470 	attrs->max_rqst_sz = be32_to_cpup(p++);
4471 	attrs->max_resp_sz = be32_to_cpup(p++);
4472 	attrs->max_resp_sz_cached = be32_to_cpup(p++);
4473 	attrs->max_ops = be32_to_cpup(p++);
4474 	attrs->max_reqs = be32_to_cpup(p++);
4475 	nr_attrs = be32_to_cpup(p);
4476 	if (unlikely(nr_attrs > 1)) {
4477 		printk(KERN_WARNING "%s: Invalid rdma channel attrs count %u\n",
4478 			__func__, nr_attrs);
4479 		return -EINVAL;
4480 	}
4481 	if (nr_attrs == 1) {
4482 		p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
4483 		if (unlikely(!p))
4484 			goto out_overflow;
4485 	}
4486 	return 0;
4487 out_overflow:
4488 	print_overflow_msg(__func__, xdr);
4489 	return -EIO;
4490 }
4491 
4492 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
4493 {
4494 	return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
4495 }
4496 
4497 static int decode_create_session(struct xdr_stream *xdr,
4498 				 struct nfs41_create_session_res *res)
4499 {
4500 	__be32 *p;
4501 	int status;
4502 	struct nfs_client *clp = res->client;
4503 	struct nfs4_session *session = clp->cl_session;
4504 
4505 	status = decode_op_hdr(xdr, OP_CREATE_SESSION);
4506 	if (!status)
4507 		status = decode_sessionid(xdr, &session->sess_id);
4508 	if (unlikely(status))
4509 		return status;
4510 
4511 	/* seqid, flags */
4512 	p = xdr_inline_decode(xdr, 8);
4513 	if (unlikely(!p))
4514 		goto out_overflow;
4515 	clp->cl_seqid = be32_to_cpup(p++);
4516 	session->flags = be32_to_cpup(p);
4517 
4518 	/* Channel attributes */
4519 	status = decode_chan_attrs(xdr, &session->fc_attrs);
4520 	if (!status)
4521 		status = decode_chan_attrs(xdr, &session->bc_attrs);
4522 	return status;
4523 out_overflow:
4524 	print_overflow_msg(__func__, xdr);
4525 	return -EIO;
4526 }
4527 
4528 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
4529 {
4530 	return decode_op_hdr(xdr, OP_DESTROY_SESSION);
4531 }
4532 #endif /* CONFIG_NFS_V4_1 */
4533 
4534 static int decode_sequence(struct xdr_stream *xdr,
4535 			   struct nfs4_sequence_res *res,
4536 			   struct rpc_rqst *rqstp)
4537 {
4538 #if defined(CONFIG_NFS_V4_1)
4539 	struct nfs4_slot *slot;
4540 	struct nfs4_sessionid id;
4541 	u32 dummy;
4542 	int status;
4543 	__be32 *p;
4544 
4545 	if (!res->sr_session)
4546 		return 0;
4547 
4548 	status = decode_op_hdr(xdr, OP_SEQUENCE);
4549 	if (!status)
4550 		status = decode_sessionid(xdr, &id);
4551 	if (unlikely(status))
4552 		goto out_err;
4553 
4554 	/*
4555 	 * If the server returns different values for sessionID, slotID or
4556 	 * sequence number, the server is looney tunes.
4557 	 */
4558 	status = -ESERVERFAULT;
4559 
4560 	if (memcmp(id.data, res->sr_session->sess_id.data,
4561 		   NFS4_MAX_SESSIONID_LEN)) {
4562 		dprintk("%s Invalid session id\n", __func__);
4563 		goto out_err;
4564 	}
4565 
4566 	p = xdr_inline_decode(xdr, 20);
4567 	if (unlikely(!p))
4568 		goto out_overflow;
4569 
4570 	/* seqid */
4571 	slot = &res->sr_session->fc_slot_table.slots[res->sr_slotid];
4572 	dummy = be32_to_cpup(p++);
4573 	if (dummy != slot->seq_nr) {
4574 		dprintk("%s Invalid sequence number\n", __func__);
4575 		goto out_err;
4576 	}
4577 	/* slot id */
4578 	dummy = be32_to_cpup(p++);
4579 	if (dummy != res->sr_slotid) {
4580 		dprintk("%s Invalid slot id\n", __func__);
4581 		goto out_err;
4582 	}
4583 	/* highest slot id - currently not processed */
4584 	dummy = be32_to_cpup(p++);
4585 	/* target highest slot id - currently not processed */
4586 	dummy = be32_to_cpup(p++);
4587 	/* result flags - currently not processed */
4588 	dummy = be32_to_cpup(p);
4589 	status = 0;
4590 out_err:
4591 	res->sr_status = status;
4592 	return status;
4593 out_overflow:
4594 	print_overflow_msg(__func__, xdr);
4595 	status = -EIO;
4596 	goto out_err;
4597 #else  /* CONFIG_NFS_V4_1 */
4598 	return 0;
4599 #endif /* CONFIG_NFS_V4_1 */
4600 }
4601 
4602 /*
4603  * END OF "GENERIC" DECODE ROUTINES.
4604  */
4605 
4606 /*
4607  * Decode OPEN_DOWNGRADE response
4608  */
4609 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
4610 {
4611 	struct xdr_stream xdr;
4612 	struct compound_hdr hdr;
4613 	int status;
4614 
4615 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4616 	status = decode_compound_hdr(&xdr, &hdr);
4617 	if (status)
4618 		goto out;
4619 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4620 	if (status)
4621 		goto out;
4622 	status = decode_putfh(&xdr);
4623 	if (status)
4624 		goto out;
4625 	status = decode_open_downgrade(&xdr, res);
4626 	if (status != 0)
4627 		goto out;
4628 	decode_getfattr(&xdr, res->fattr, res->server,
4629 			!RPC_IS_ASYNC(rqstp->rq_task));
4630 out:
4631 	return status;
4632 }
4633 
4634 /*
4635  * Decode ACCESS response
4636  */
4637 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_accessres *res)
4638 {
4639 	struct xdr_stream xdr;
4640 	struct compound_hdr hdr;
4641 	int status;
4642 
4643 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4644 	status = decode_compound_hdr(&xdr, &hdr);
4645 	if (status)
4646 		goto out;
4647 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4648 	if (status)
4649 		goto out;
4650 	status = decode_putfh(&xdr);
4651 	if (status != 0)
4652 		goto out;
4653 	status = decode_access(&xdr, res);
4654 	if (status != 0)
4655 		goto out;
4656 	decode_getfattr(&xdr, res->fattr, res->server,
4657 			!RPC_IS_ASYNC(rqstp->rq_task));
4658 out:
4659 	return status;
4660 }
4661 
4662 /*
4663  * Decode LOOKUP response
4664  */
4665 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
4666 {
4667 	struct xdr_stream xdr;
4668 	struct compound_hdr hdr;
4669 	int status;
4670 
4671 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4672 	status = decode_compound_hdr(&xdr, &hdr);
4673 	if (status)
4674 		goto out;
4675 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4676 	if (status)
4677 		goto out;
4678 	if ((status = decode_putfh(&xdr)) != 0)
4679 		goto out;
4680 	if ((status = decode_lookup(&xdr)) != 0)
4681 		goto out;
4682 	if ((status = decode_getfh(&xdr, res->fh)) != 0)
4683 		goto out;
4684 	status = decode_getfattr(&xdr, res->fattr, res->server
4685 			,!RPC_IS_ASYNC(rqstp->rq_task));
4686 out:
4687 	return status;
4688 }
4689 
4690 /*
4691  * Decode LOOKUP_ROOT response
4692  */
4693 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_lookup_res *res)
4694 {
4695 	struct xdr_stream xdr;
4696 	struct compound_hdr hdr;
4697 	int status;
4698 
4699 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4700 	status = decode_compound_hdr(&xdr, &hdr);
4701 	if (status)
4702 		goto out;
4703 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4704 	if (status)
4705 		goto out;
4706 	if ((status = decode_putrootfh(&xdr)) != 0)
4707 		goto out;
4708 	if ((status = decode_getfh(&xdr, res->fh)) == 0)
4709 		status = decode_getfattr(&xdr, res->fattr, res->server,
4710 				!RPC_IS_ASYNC(rqstp->rq_task));
4711 out:
4712 	return status;
4713 }
4714 
4715 /*
4716  * Decode REMOVE response
4717  */
4718 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, __be32 *p, struct nfs_removeres *res)
4719 {
4720 	struct xdr_stream xdr;
4721 	struct compound_hdr hdr;
4722 	int status;
4723 
4724 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4725 	status = decode_compound_hdr(&xdr, &hdr);
4726 	if (status)
4727 		goto out;
4728 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4729 	if (status)
4730 		goto out;
4731 	if ((status = decode_putfh(&xdr)) != 0)
4732 		goto out;
4733 	if ((status = decode_remove(&xdr, &res->cinfo)) != 0)
4734 		goto out;
4735 	decode_getfattr(&xdr, &res->dir_attr, res->server,
4736 			!RPC_IS_ASYNC(rqstp->rq_task));
4737 out:
4738 	return status;
4739 }
4740 
4741 /*
4742  * Decode RENAME response
4743  */
4744 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_rename_res *res)
4745 {
4746 	struct xdr_stream xdr;
4747 	struct compound_hdr hdr;
4748 	int status;
4749 
4750 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4751 	status = decode_compound_hdr(&xdr, &hdr);
4752 	if (status)
4753 		goto out;
4754 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4755 	if (status)
4756 		goto out;
4757 	if ((status = decode_putfh(&xdr)) != 0)
4758 		goto out;
4759 	if ((status = decode_savefh(&xdr)) != 0)
4760 		goto out;
4761 	if ((status = decode_putfh(&xdr)) != 0)
4762 		goto out;
4763 	if ((status = decode_rename(&xdr, &res->old_cinfo, &res->new_cinfo)) != 0)
4764 		goto out;
4765 	/* Current FH is target directory */
4766 	if (decode_getfattr(&xdr, res->new_fattr, res->server,
4767 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4768 		goto out;
4769 	if ((status = decode_restorefh(&xdr)) != 0)
4770 		goto out;
4771 	decode_getfattr(&xdr, res->old_fattr, res->server,
4772 			!RPC_IS_ASYNC(rqstp->rq_task));
4773 out:
4774 	return status;
4775 }
4776 
4777 /*
4778  * Decode LINK response
4779  */
4780 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_link_res *res)
4781 {
4782 	struct xdr_stream xdr;
4783 	struct compound_hdr hdr;
4784 	int status;
4785 
4786 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4787 	status = decode_compound_hdr(&xdr, &hdr);
4788 	if (status)
4789 		goto out;
4790 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4791 	if (status)
4792 		goto out;
4793 	if ((status = decode_putfh(&xdr)) != 0)
4794 		goto out;
4795 	if ((status = decode_savefh(&xdr)) != 0)
4796 		goto out;
4797 	if ((status = decode_putfh(&xdr)) != 0)
4798 		goto out;
4799 	if ((status = decode_link(&xdr, &res->cinfo)) != 0)
4800 		goto out;
4801 	/*
4802 	 * Note order: OP_LINK leaves the directory as the current
4803 	 *             filehandle.
4804 	 */
4805 	if (decode_getfattr(&xdr, res->dir_attr, res->server,
4806 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4807 		goto out;
4808 	if ((status = decode_restorefh(&xdr)) != 0)
4809 		goto out;
4810 	decode_getfattr(&xdr, res->fattr, res->server,
4811 			!RPC_IS_ASYNC(rqstp->rq_task));
4812 out:
4813 	return status;
4814 }
4815 
4816 /*
4817  * Decode CREATE response
4818  */
4819 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
4820 {
4821 	struct xdr_stream xdr;
4822 	struct compound_hdr hdr;
4823 	int status;
4824 
4825 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4826 	status = decode_compound_hdr(&xdr, &hdr);
4827 	if (status)
4828 		goto out;
4829 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4830 	if (status)
4831 		goto out;
4832 	if ((status = decode_putfh(&xdr)) != 0)
4833 		goto out;
4834 	if ((status = decode_savefh(&xdr)) != 0)
4835 		goto out;
4836 	if ((status = decode_create(&xdr,&res->dir_cinfo)) != 0)
4837 		goto out;
4838 	if ((status = decode_getfh(&xdr, res->fh)) != 0)
4839 		goto out;
4840 	if (decode_getfattr(&xdr, res->fattr, res->server,
4841 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
4842 		goto out;
4843 	if ((status = decode_restorefh(&xdr)) != 0)
4844 		goto out;
4845 	decode_getfattr(&xdr, res->dir_fattr, res->server,
4846 			!RPC_IS_ASYNC(rqstp->rq_task));
4847 out:
4848 	return status;
4849 }
4850 
4851 /*
4852  * Decode SYMLINK response
4853  */
4854 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_create_res *res)
4855 {
4856 	return nfs4_xdr_dec_create(rqstp, p, res);
4857 }
4858 
4859 /*
4860  * Decode GETATTR response
4861  */
4862 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_getattr_res *res)
4863 {
4864 	struct xdr_stream xdr;
4865 	struct compound_hdr hdr;
4866 	int status;
4867 
4868 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4869 	status = decode_compound_hdr(&xdr, &hdr);
4870 	if (status)
4871 		goto out;
4872 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4873 	if (status)
4874 		goto out;
4875 	status = decode_putfh(&xdr);
4876 	if (status)
4877 		goto out;
4878 	status = decode_getfattr(&xdr, res->fattr, res->server,
4879 			!RPC_IS_ASYNC(rqstp->rq_task));
4880 out:
4881 	return status;
4882 }
4883 
4884 /*
4885  * Encode an SETACL request
4886  */
4887 static int
4888 nfs4_xdr_enc_setacl(struct rpc_rqst *req, __be32 *p, struct nfs_setaclargs *args)
4889 {
4890 	struct xdr_stream xdr;
4891 	struct compound_hdr hdr = {
4892 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
4893 	};
4894 	int status;
4895 
4896 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
4897 	encode_compound_hdr(&xdr, req, &hdr);
4898 	encode_sequence(&xdr, &args->seq_args, &hdr);
4899 	encode_putfh(&xdr, args->fh, &hdr);
4900 	status = encode_setacl(&xdr, args, &hdr);
4901 	encode_nops(&hdr);
4902 	return status;
4903 }
4904 
4905 /*
4906  * Decode SETACL response
4907  */
4908 static int
4909 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, __be32 *p,
4910 		    struct nfs_setaclres *res)
4911 {
4912 	struct xdr_stream xdr;
4913 	struct compound_hdr hdr;
4914 	int status;
4915 
4916 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4917 	status = decode_compound_hdr(&xdr, &hdr);
4918 	if (status)
4919 		goto out;
4920 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4921 	if (status)
4922 		goto out;
4923 	status = decode_putfh(&xdr);
4924 	if (status)
4925 		goto out;
4926 	status = decode_setattr(&xdr);
4927 out:
4928 	return status;
4929 }
4930 
4931 /*
4932  * Decode GETACL response
4933  */
4934 static int
4935 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, __be32 *p,
4936 		    struct nfs_getaclres *res)
4937 {
4938 	struct xdr_stream xdr;
4939 	struct compound_hdr hdr;
4940 	int status;
4941 
4942 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4943 	status = decode_compound_hdr(&xdr, &hdr);
4944 	if (status)
4945 		goto out;
4946 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4947 	if (status)
4948 		goto out;
4949 	status = decode_putfh(&xdr);
4950 	if (status)
4951 		goto out;
4952 	status = decode_getacl(&xdr, rqstp, &res->acl_len);
4953 
4954 out:
4955 	return status;
4956 }
4957 
4958 /*
4959  * Decode CLOSE response
4960  */
4961 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, __be32 *p, struct nfs_closeres *res)
4962 {
4963 	struct xdr_stream xdr;
4964 	struct compound_hdr hdr;
4965 	int status;
4966 
4967 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4968 	status = decode_compound_hdr(&xdr, &hdr);
4969 	if (status)
4970 		goto out;
4971 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
4972 	if (status)
4973 		goto out;
4974 	status = decode_putfh(&xdr);
4975 	if (status)
4976 		goto out;
4977 	status = decode_close(&xdr, res);
4978 	if (status != 0)
4979 		goto out;
4980 	/*
4981 	 * Note: Server may do delete on close for this file
4982 	 * 	in which case the getattr call will fail with
4983 	 * 	an ESTALE error. Shouldn't be a problem,
4984 	 * 	though, since fattr->valid will remain unset.
4985 	 */
4986 	decode_getfattr(&xdr, res->fattr, res->server,
4987 			!RPC_IS_ASYNC(rqstp->rq_task));
4988 out:
4989 	return status;
4990 }
4991 
4992 /*
4993  * Decode OPEN response
4994  */
4995 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
4996 {
4997 	struct xdr_stream xdr;
4998 	struct compound_hdr hdr;
4999 	int status;
5000 
5001 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5002 	status = decode_compound_hdr(&xdr, &hdr);
5003 	if (status)
5004 		goto out;
5005 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5006 	if (status)
5007 		goto out;
5008 	status = decode_putfh(&xdr);
5009 	if (status)
5010 		goto out;
5011 	status = decode_savefh(&xdr);
5012 	if (status)
5013 		goto out;
5014 	status = decode_open(&xdr, res);
5015 	if (status)
5016 		goto out;
5017 	if (decode_getfh(&xdr, &res->fh) != 0)
5018 		goto out;
5019 	if (decode_getfattr(&xdr, res->f_attr, res->server,
5020 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5021 		goto out;
5022 	if (decode_restorefh(&xdr) != 0)
5023 		goto out;
5024 	decode_getfattr(&xdr, res->dir_attr, res->server,
5025 			!RPC_IS_ASYNC(rqstp->rq_task));
5026 out:
5027 	return status;
5028 }
5029 
5030 /*
5031  * Decode OPEN_CONFIRM response
5032  */
5033 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp, __be32 *p, struct nfs_open_confirmres *res)
5034 {
5035 	struct xdr_stream xdr;
5036 	struct compound_hdr hdr;
5037 	int status;
5038 
5039 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5040 	status = decode_compound_hdr(&xdr, &hdr);
5041 	if (status)
5042 		goto out;
5043 	status = decode_putfh(&xdr);
5044 	if (status)
5045 		goto out;
5046 	status = decode_open_confirm(&xdr, res);
5047 out:
5048 	return status;
5049 }
5050 
5051 /*
5052  * Decode OPEN response
5053  */
5054 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs_openres *res)
5055 {
5056 	struct xdr_stream xdr;
5057 	struct compound_hdr hdr;
5058 	int status;
5059 
5060 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5061 	status = decode_compound_hdr(&xdr, &hdr);
5062 	if (status)
5063 		goto out;
5064 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5065 	if (status)
5066 		goto out;
5067 	status = decode_putfh(&xdr);
5068 	if (status)
5069 		goto out;
5070 	status = decode_open(&xdr, res);
5071 	if (status)
5072 		goto out;
5073 	decode_getfattr(&xdr, res->f_attr, res->server,
5074 			!RPC_IS_ASYNC(rqstp->rq_task));
5075 out:
5076 	return status;
5077 }
5078 
5079 /*
5080  * Decode SETATTR response
5081  */
5082 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp, __be32 *p, struct nfs_setattrres *res)
5083 {
5084 	struct xdr_stream xdr;
5085 	struct compound_hdr hdr;
5086 	int status;
5087 
5088 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5089 	status = decode_compound_hdr(&xdr, &hdr);
5090 	if (status)
5091 		goto out;
5092 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5093 	if (status)
5094 		goto out;
5095 	status = decode_putfh(&xdr);
5096 	if (status)
5097 		goto out;
5098 	status = decode_setattr(&xdr);
5099 	if (status)
5100 		goto out;
5101 	decode_getfattr(&xdr, res->fattr, res->server,
5102 			!RPC_IS_ASYNC(rqstp->rq_task));
5103 out:
5104 	return status;
5105 }
5106 
5107 /*
5108  * Decode LOCK response
5109  */
5110 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, __be32 *p, struct nfs_lock_res *res)
5111 {
5112 	struct xdr_stream xdr;
5113 	struct compound_hdr hdr;
5114 	int status;
5115 
5116 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5117 	status = decode_compound_hdr(&xdr, &hdr);
5118 	if (status)
5119 		goto out;
5120 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5121 	if (status)
5122 		goto out;
5123 	status = decode_putfh(&xdr);
5124 	if (status)
5125 		goto out;
5126 	status = decode_lock(&xdr, res);
5127 out:
5128 	return status;
5129 }
5130 
5131 /*
5132  * Decode LOCKT response
5133  */
5134 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, __be32 *p, struct nfs_lockt_res *res)
5135 {
5136 	struct xdr_stream xdr;
5137 	struct compound_hdr hdr;
5138 	int status;
5139 
5140 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5141 	status = decode_compound_hdr(&xdr, &hdr);
5142 	if (status)
5143 		goto out;
5144 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5145 	if (status)
5146 		goto out;
5147 	status = decode_putfh(&xdr);
5148 	if (status)
5149 		goto out;
5150 	status = decode_lockt(&xdr, res);
5151 out:
5152 	return status;
5153 }
5154 
5155 /*
5156  * Decode LOCKU response
5157  */
5158 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, __be32 *p, struct nfs_locku_res *res)
5159 {
5160 	struct xdr_stream xdr;
5161 	struct compound_hdr hdr;
5162 	int status;
5163 
5164 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5165 	status = decode_compound_hdr(&xdr, &hdr);
5166 	if (status)
5167 		goto out;
5168 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5169 	if (status)
5170 		goto out;
5171 	status = decode_putfh(&xdr);
5172 	if (status)
5173 		goto out;
5174 	status = decode_locku(&xdr, res);
5175 out:
5176 	return status;
5177 }
5178 
5179 /*
5180  * Decode READLINK response
5181  */
5182 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp, __be32 *p,
5183 				 struct nfs4_readlink_res *res)
5184 {
5185 	struct xdr_stream xdr;
5186 	struct compound_hdr hdr;
5187 	int status;
5188 
5189 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5190 	status = decode_compound_hdr(&xdr, &hdr);
5191 	if (status)
5192 		goto out;
5193 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5194 	if (status)
5195 		goto out;
5196 	status = decode_putfh(&xdr);
5197 	if (status)
5198 		goto out;
5199 	status = decode_readlink(&xdr, rqstp);
5200 out:
5201 	return status;
5202 }
5203 
5204 /*
5205  * Decode READDIR response
5206  */
5207 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_readdir_res *res)
5208 {
5209 	struct xdr_stream xdr;
5210 	struct compound_hdr hdr;
5211 	int status;
5212 
5213 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5214 	status = decode_compound_hdr(&xdr, &hdr);
5215 	if (status)
5216 		goto out;
5217 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5218 	if (status)
5219 		goto out;
5220 	status = decode_putfh(&xdr);
5221 	if (status)
5222 		goto out;
5223 	status = decode_readdir(&xdr, rqstp, res);
5224 out:
5225 	return status;
5226 }
5227 
5228 /*
5229  * Decode Read response
5230  */
5231 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, __be32 *p, struct nfs_readres *res)
5232 {
5233 	struct xdr_stream xdr;
5234 	struct compound_hdr hdr;
5235 	int status;
5236 
5237 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5238 	status = decode_compound_hdr(&xdr, &hdr);
5239 	if (status)
5240 		goto out;
5241 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5242 	if (status)
5243 		goto out;
5244 	status = decode_putfh(&xdr);
5245 	if (status)
5246 		goto out;
5247 	status = decode_read(&xdr, rqstp, res);
5248 	if (!status)
5249 		status = res->count;
5250 out:
5251 	return status;
5252 }
5253 
5254 /*
5255  * Decode WRITE response
5256  */
5257 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, __be32 *p, struct nfs_writeres *res)
5258 {
5259 	struct xdr_stream xdr;
5260 	struct compound_hdr hdr;
5261 	int status;
5262 
5263 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5264 	status = decode_compound_hdr(&xdr, &hdr);
5265 	if (status)
5266 		goto out;
5267 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5268 	if (status)
5269 		goto out;
5270 	status = decode_putfh(&xdr);
5271 	if (status)
5272 		goto out;
5273 	status = decode_write(&xdr, res);
5274 	if (status)
5275 		goto out;
5276 	decode_getfattr(&xdr, res->fattr, res->server,
5277 			!RPC_IS_ASYNC(rqstp->rq_task));
5278 	if (!status)
5279 		status = res->count;
5280 out:
5281 	return status;
5282 }
5283 
5284 /*
5285  * Decode COMMIT response
5286  */
5287 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, __be32 *p, struct nfs_writeres *res)
5288 {
5289 	struct xdr_stream xdr;
5290 	struct compound_hdr hdr;
5291 	int status;
5292 
5293 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5294 	status = decode_compound_hdr(&xdr, &hdr);
5295 	if (status)
5296 		goto out;
5297 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5298 	if (status)
5299 		goto out;
5300 	status = decode_putfh(&xdr);
5301 	if (status)
5302 		goto out;
5303 	status = decode_commit(&xdr, res);
5304 	if (status)
5305 		goto out;
5306 	decode_getfattr(&xdr, res->fattr, res->server,
5307 			!RPC_IS_ASYNC(rqstp->rq_task));
5308 out:
5309 	return status;
5310 }
5311 
5312 /*
5313  * FSINFO request
5314  */
5315 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, __be32 *p,
5316 			       struct nfs4_fsinfo_res *res)
5317 {
5318 	struct xdr_stream xdr;
5319 	struct compound_hdr hdr;
5320 	int status;
5321 
5322 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5323 	status = decode_compound_hdr(&xdr, &hdr);
5324 	if (!status)
5325 		status = decode_sequence(&xdr, &res->seq_res, req);
5326 	if (!status)
5327 		status = decode_putfh(&xdr);
5328 	if (!status)
5329 		status = decode_fsinfo(&xdr, res->fsinfo);
5330 	return status;
5331 }
5332 
5333 /*
5334  * PATHCONF request
5335  */
5336 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, __be32 *p,
5337 				 struct nfs4_pathconf_res *res)
5338 {
5339 	struct xdr_stream xdr;
5340 	struct compound_hdr hdr;
5341 	int status;
5342 
5343 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5344 	status = decode_compound_hdr(&xdr, &hdr);
5345 	if (!status)
5346 		status = decode_sequence(&xdr, &res->seq_res, req);
5347 	if (!status)
5348 		status = decode_putfh(&xdr);
5349 	if (!status)
5350 		status = decode_pathconf(&xdr, res->pathconf);
5351 	return status;
5352 }
5353 
5354 /*
5355  * STATFS request
5356  */
5357 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, __be32 *p,
5358 			       struct nfs4_statfs_res *res)
5359 {
5360 	struct xdr_stream xdr;
5361 	struct compound_hdr hdr;
5362 	int status;
5363 
5364 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5365 	status = decode_compound_hdr(&xdr, &hdr);
5366 	if (!status)
5367 		status = decode_sequence(&xdr, &res->seq_res, req);
5368 	if (!status)
5369 		status = decode_putfh(&xdr);
5370 	if (!status)
5371 		status = decode_statfs(&xdr, res->fsstat);
5372 	return status;
5373 }
5374 
5375 /*
5376  * GETATTR_BITMAP request
5377  */
5378 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req, __be32 *p, struct nfs4_server_caps_res *res)
5379 {
5380 	struct xdr_stream xdr;
5381 	struct compound_hdr hdr;
5382 	int status;
5383 
5384 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5385 	status = decode_compound_hdr(&xdr, &hdr);
5386 	if (status)
5387 		goto out;
5388 	status = decode_sequence(&xdr, &res->seq_res, req);
5389 	if (status)
5390 		goto out;
5391 	if ((status = decode_putfh(&xdr)) != 0)
5392 		goto out;
5393 	status = decode_server_caps(&xdr, res);
5394 out:
5395 	return status;
5396 }
5397 
5398 /*
5399  * Decode RENEW response
5400  */
5401 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, __be32 *p, void *dummy)
5402 {
5403 	struct xdr_stream xdr;
5404 	struct compound_hdr hdr;
5405 	int status;
5406 
5407 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5408 	status = decode_compound_hdr(&xdr, &hdr);
5409 	if (!status)
5410 		status = decode_renew(&xdr);
5411 	return status;
5412 }
5413 
5414 /*
5415  * a SETCLIENTID request
5416  */
5417 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req, __be32 *p,
5418 		struct nfs_client *clp)
5419 {
5420 	struct xdr_stream xdr;
5421 	struct compound_hdr hdr;
5422 	int status;
5423 
5424 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5425 	status = decode_compound_hdr(&xdr, &hdr);
5426 	if (!status)
5427 		status = decode_setclientid(&xdr, clp);
5428 	return status;
5429 }
5430 
5431 /*
5432  * a SETCLIENTID_CONFIRM request
5433  */
5434 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req, __be32 *p, struct nfs_fsinfo *fsinfo)
5435 {
5436 	struct xdr_stream xdr;
5437 	struct compound_hdr hdr;
5438 	int status;
5439 
5440 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5441 	status = decode_compound_hdr(&xdr, &hdr);
5442 	if (!status)
5443 		status = decode_setclientid_confirm(&xdr);
5444 	if (!status)
5445 		status = decode_putrootfh(&xdr);
5446 	if (!status)
5447 		status = decode_fsinfo(&xdr, fsinfo);
5448 	return status;
5449 }
5450 
5451 /*
5452  * DELEGRETURN request
5453  */
5454 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, __be32 *p, struct nfs4_delegreturnres *res)
5455 {
5456 	struct xdr_stream xdr;
5457 	struct compound_hdr hdr;
5458 	int status;
5459 
5460 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5461 	status = decode_compound_hdr(&xdr, &hdr);
5462 	if (status)
5463 		goto out;
5464 	status = decode_sequence(&xdr, &res->seq_res, rqstp);
5465 	if (status)
5466 		goto out;
5467 	status = decode_putfh(&xdr);
5468 	if (status != 0)
5469 		goto out;
5470 	status = decode_delegreturn(&xdr);
5471 	decode_getfattr(&xdr, res->fattr, res->server,
5472 			!RPC_IS_ASYNC(rqstp->rq_task));
5473 out:
5474 	return status;
5475 }
5476 
5477 /*
5478  * FS_LOCATIONS request
5479  */
5480 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, __be32 *p,
5481 				     struct nfs4_fs_locations_res *res)
5482 {
5483 	struct xdr_stream xdr;
5484 	struct compound_hdr hdr;
5485 	int status;
5486 
5487 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
5488 	status = decode_compound_hdr(&xdr, &hdr);
5489 	if (status)
5490 		goto out;
5491 	status = decode_sequence(&xdr, &res->seq_res, req);
5492 	if (status)
5493 		goto out;
5494 	if ((status = decode_putfh(&xdr)) != 0)
5495 		goto out;
5496 	if ((status = decode_lookup(&xdr)) != 0)
5497 		goto out;
5498 	xdr_enter_page(&xdr, PAGE_SIZE);
5499 	status = decode_getfattr(&xdr, &res->fs_locations->fattr,
5500 				 res->fs_locations->server,
5501 				 !RPC_IS_ASYNC(req->rq_task));
5502 out:
5503 	return status;
5504 }
5505 
5506 #if defined(CONFIG_NFS_V4_1)
5507 /*
5508  * EXCHANGE_ID request
5509  */
5510 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp, uint32_t *p,
5511 				    void *res)
5512 {
5513 	struct xdr_stream xdr;
5514 	struct compound_hdr hdr;
5515 	int status;
5516 
5517 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5518 	status = decode_compound_hdr(&xdr, &hdr);
5519 	if (!status)
5520 		status = decode_exchange_id(&xdr, res);
5521 	return status;
5522 }
5523 
5524 /*
5525  * a CREATE_SESSION request
5526  */
5527 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp, uint32_t *p,
5528 				       struct nfs41_create_session_res *res)
5529 {
5530 	struct xdr_stream xdr;
5531 	struct compound_hdr hdr;
5532 	int status;
5533 
5534 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5535 	status = decode_compound_hdr(&xdr, &hdr);
5536 	if (!status)
5537 		status = decode_create_session(&xdr, res);
5538 	return status;
5539 }
5540 
5541 /*
5542  * a DESTROY_SESSION request
5543  */
5544 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp, uint32_t *p,
5545 					void *dummy)
5546 {
5547 	struct xdr_stream xdr;
5548 	struct compound_hdr hdr;
5549 	int status;
5550 
5551 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5552 	status = decode_compound_hdr(&xdr, &hdr);
5553 	if (!status)
5554 		status = decode_destroy_session(&xdr, dummy);
5555 	return status;
5556 }
5557 
5558 /*
5559  * a SEQUENCE request
5560  */
5561 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp, uint32_t *p,
5562 				 struct nfs4_sequence_res *res)
5563 {
5564 	struct xdr_stream xdr;
5565 	struct compound_hdr hdr;
5566 	int status;
5567 
5568 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5569 	status = decode_compound_hdr(&xdr, &hdr);
5570 	if (!status)
5571 		status = decode_sequence(&xdr, res, rqstp);
5572 	return status;
5573 }
5574 
5575 /*
5576  * a GET_LEASE_TIME request
5577  */
5578 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp, uint32_t *p,
5579 				       struct nfs4_get_lease_time_res *res)
5580 {
5581 	struct xdr_stream xdr;
5582 	struct compound_hdr hdr;
5583 	int status;
5584 
5585 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
5586 	status = decode_compound_hdr(&xdr, &hdr);
5587 	if (!status)
5588 		status = decode_sequence(&xdr, &res->lr_seq_res, rqstp);
5589 	if (!status)
5590 		status = decode_putrootfh(&xdr);
5591 	if (!status)
5592 		status = decode_fsinfo(&xdr, res->lr_fsinfo);
5593 	return status;
5594 }
5595 #endif /* CONFIG_NFS_V4_1 */
5596 
5597 __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus)
5598 {
5599 	uint32_t bitmap[2] = {0};
5600 	uint32_t len;
5601 
5602 	if (!*p++) {
5603 		if (!*p)
5604 			return ERR_PTR(-EAGAIN);
5605 		entry->eof = 1;
5606 		return ERR_PTR(-EBADCOOKIE);
5607 	}
5608 
5609 	entry->prev_cookie = entry->cookie;
5610 	p = xdr_decode_hyper(p, &entry->cookie);
5611 	entry->len = ntohl(*p++);
5612 	entry->name = (const char *) p;
5613 	p += XDR_QUADLEN(entry->len);
5614 
5615 	/*
5616 	 * In case the server doesn't return an inode number,
5617 	 * we fake one here.  (We don't use inode number 0,
5618 	 * since glibc seems to choke on it...)
5619 	 */
5620 	entry->ino = 1;
5621 
5622 	len = ntohl(*p++);		/* bitmap length */
5623 	if (len-- > 0) {
5624 		bitmap[0] = ntohl(*p++);
5625 		if (len-- > 0) {
5626 			bitmap[1] = ntohl(*p++);
5627 			p += len;
5628 		}
5629 	}
5630 	len = XDR_QUADLEN(ntohl(*p++));	/* attribute buffer length */
5631 	if (len > 0) {
5632 		if (bitmap[0] & FATTR4_WORD0_RDATTR_ERROR) {
5633 			bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
5634 			/* Ignore the return value of rdattr_error for now */
5635 			p++;
5636 			len--;
5637 		}
5638 		if (bitmap[0] == 0 && bitmap[1] == FATTR4_WORD1_MOUNTED_ON_FILEID)
5639 			xdr_decode_hyper(p, &entry->ino);
5640 		else if (bitmap[0] == FATTR4_WORD0_FILEID)
5641 			xdr_decode_hyper(p, &entry->ino);
5642 		p += len;
5643 	}
5644 
5645 	entry->eof = !p[0] && p[1];
5646 	return p;
5647 }
5648 
5649 /*
5650  * We need to translate between nfs status return values and
5651  * the local errno values which may not be the same.
5652  */
5653 static struct {
5654 	int stat;
5655 	int errno;
5656 } nfs_errtbl[] = {
5657 	{ NFS4_OK,		0		},
5658 	{ NFS4ERR_PERM,		-EPERM		},
5659 	{ NFS4ERR_NOENT,	-ENOENT		},
5660 	{ NFS4ERR_IO,		-errno_NFSERR_IO},
5661 	{ NFS4ERR_NXIO,		-ENXIO		},
5662 	{ NFS4ERR_ACCESS,	-EACCES		},
5663 	{ NFS4ERR_EXIST,	-EEXIST		},
5664 	{ NFS4ERR_XDEV,		-EXDEV		},
5665 	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
5666 	{ NFS4ERR_ISDIR,	-EISDIR		},
5667 	{ NFS4ERR_INVAL,	-EINVAL		},
5668 	{ NFS4ERR_FBIG,		-EFBIG		},
5669 	{ NFS4ERR_NOSPC,	-ENOSPC		},
5670 	{ NFS4ERR_ROFS,		-EROFS		},
5671 	{ NFS4ERR_MLINK,	-EMLINK		},
5672 	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
5673 	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
5674 	{ NFS4ERR_DQUOT,	-EDQUOT		},
5675 	{ NFS4ERR_STALE,	-ESTALE		},
5676 	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
5677 	{ NFS4ERR_BADOWNER,	-EINVAL		},
5678 	{ NFS4ERR_BADNAME,	-EINVAL		},
5679 	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
5680 	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
5681 	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
5682 	{ NFS4ERR_SERVERFAULT,	-ESERVERFAULT	},
5683 	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
5684 	{ NFS4ERR_LOCKED,	-EAGAIN		},
5685 	{ NFS4ERR_RESOURCE,	-EREMOTEIO	},
5686 	{ NFS4ERR_SYMLINK,	-ELOOP		},
5687 	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
5688 	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
5689 	{ NFS4ERR_WRONGSEC,	-EPERM		}, /* FIXME: this needs
5690 						    * to be handled by a
5691 						    * middle-layer.
5692 						    */
5693 	{ -1,			-EIO		}
5694 };
5695 
5696 /*
5697  * Convert an NFS error code to a local one.
5698  * This one is used jointly by NFSv2 and NFSv3.
5699  */
5700 static int
5701 nfs4_stat_to_errno(int stat)
5702 {
5703 	int i;
5704 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
5705 		if (nfs_errtbl[i].stat == stat)
5706 			return nfs_errtbl[i].errno;
5707 	}
5708 	if (stat <= 10000 || stat > 10100) {
5709 		/* The server is looney tunes. */
5710 		return -ESERVERFAULT;
5711 	}
5712 	/* If we cannot translate the error, the recovery routines should
5713 	 * handle it.
5714 	 * Note: remaining NFSv4 error codes have values > 10000, so should
5715 	 * not conflict with native Linux error codes.
5716 	 */
5717 	return -stat;
5718 }
5719 
5720 #define PROC(proc, argtype, restype)				\
5721 [NFSPROC4_CLNT_##proc] = {					\
5722 	.p_proc   = NFSPROC4_COMPOUND,				\
5723 	.p_encode = (kxdrproc_t) nfs4_xdr_##argtype,		\
5724 	.p_decode = (kxdrproc_t) nfs4_xdr_##restype,		\
5725 	.p_arglen = NFS4_##argtype##_sz,			\
5726 	.p_replen = NFS4_##restype##_sz,			\
5727 	.p_statidx = NFSPROC4_CLNT_##proc,			\
5728 	.p_name   = #proc,					\
5729 }
5730 
5731 struct rpc_procinfo	nfs4_procedures[] = {
5732   PROC(READ,		enc_read,	dec_read),
5733   PROC(WRITE,		enc_write,	dec_write),
5734   PROC(COMMIT,		enc_commit,	dec_commit),
5735   PROC(OPEN,		enc_open,	dec_open),
5736   PROC(OPEN_CONFIRM,	enc_open_confirm,	dec_open_confirm),
5737   PROC(OPEN_NOATTR,	enc_open_noattr,	dec_open_noattr),
5738   PROC(OPEN_DOWNGRADE,	enc_open_downgrade,	dec_open_downgrade),
5739   PROC(CLOSE,		enc_close,	dec_close),
5740   PROC(SETATTR,		enc_setattr,	dec_setattr),
5741   PROC(FSINFO,		enc_fsinfo,	dec_fsinfo),
5742   PROC(RENEW,		enc_renew,	dec_renew),
5743   PROC(SETCLIENTID,	enc_setclientid,	dec_setclientid),
5744   PROC(SETCLIENTID_CONFIRM,	enc_setclientid_confirm,	dec_setclientid_confirm),
5745   PROC(LOCK,            enc_lock,       dec_lock),
5746   PROC(LOCKT,           enc_lockt,      dec_lockt),
5747   PROC(LOCKU,           enc_locku,      dec_locku),
5748   PROC(ACCESS,		enc_access,	dec_access),
5749   PROC(GETATTR,		enc_getattr,	dec_getattr),
5750   PROC(LOOKUP,		enc_lookup,	dec_lookup),
5751   PROC(LOOKUP_ROOT,	enc_lookup_root,	dec_lookup_root),
5752   PROC(REMOVE,		enc_remove,	dec_remove),
5753   PROC(RENAME,		enc_rename,	dec_rename),
5754   PROC(LINK,		enc_link,	dec_link),
5755   PROC(SYMLINK,		enc_symlink,	dec_symlink),
5756   PROC(CREATE,		enc_create,	dec_create),
5757   PROC(PATHCONF,	enc_pathconf,	dec_pathconf),
5758   PROC(STATFS,		enc_statfs,	dec_statfs),
5759   PROC(READLINK,	enc_readlink,	dec_readlink),
5760   PROC(READDIR,		enc_readdir,	dec_readdir),
5761   PROC(SERVER_CAPS,	enc_server_caps, dec_server_caps),
5762   PROC(DELEGRETURN,	enc_delegreturn, dec_delegreturn),
5763   PROC(GETACL,		enc_getacl,	dec_getacl),
5764   PROC(SETACL,		enc_setacl,	dec_setacl),
5765   PROC(FS_LOCATIONS,	enc_fs_locations, dec_fs_locations),
5766 #if defined(CONFIG_NFS_V4_1)
5767   PROC(EXCHANGE_ID,	enc_exchange_id,	dec_exchange_id),
5768   PROC(CREATE_SESSION,	enc_create_session,	dec_create_session),
5769   PROC(DESTROY_SESSION,	enc_destroy_session,	dec_destroy_session),
5770   PROC(SEQUENCE,	enc_sequence,	dec_sequence),
5771   PROC(GET_LEASE_TIME,	enc_get_lease_time,	dec_get_lease_time),
5772 #endif /* CONFIG_NFS_V4_1 */
5773 };
5774 
5775 struct rpc_version		nfs_version4 = {
5776 	.number			= 4,
5777 	.nrprocs		= ARRAY_SIZE(nfs4_procedures),
5778 	.procs			= nfs4_procedures
5779 };
5780 
5781 /*
5782  * Local variables:
5783  *  c-basic-offset: 8
5784  * End:
5785  */
5786