xref: /openbmc/linux/fs/nfs/nfs4xdr.c (revision 9c1f8594)
1 /*
2  *  fs/nfs/nfs4xdr.c
3  *
4  *  Client-side XDR for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include <linux/param.h>
39 #include <linux/time.h>
40 #include <linux/mm.h>
41 #include <linux/errno.h>
42 #include <linux/string.h>
43 #include <linux/in.h>
44 #include <linux/pagemap.h>
45 #include <linux/proc_fs.h>
46 #include <linux/kdev_t.h>
47 #include <linux/sunrpc/clnt.h>
48 #include <linux/sunrpc/msg_prot.h>
49 #include <linux/sunrpc/gss_api.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 #include "internal.h"
56 #include "pnfs.h"
57 
58 #define NFSDBG_FACILITY		NFSDBG_XDR
59 
60 /* Mapping from NFS error code to "errno" error code. */
61 #define errno_NFSERR_IO		EIO
62 
63 static int nfs4_stat_to_errno(int);
64 
65 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
66 #ifdef DEBUG
67 #define NFS4_MAXTAGLEN		20
68 #else
69 #define NFS4_MAXTAGLEN		0
70 #endif
71 
72 /* lock,open owner id:
73  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
74  */
75 #define open_owner_id_maxsz	(1 + 1 + 4)
76 #define lock_owner_id_maxsz	(1 + 1 + 4)
77 #define decode_lockowner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
78 #define compound_encode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
79 #define compound_decode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
80 #define op_encode_hdr_maxsz	(1)
81 #define op_decode_hdr_maxsz	(2)
82 #define encode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))
83 #define decode_stateid_maxsz	(XDR_QUADLEN(NFS4_STATEID_SIZE))
84 #define encode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
85 #define decode_verifier_maxsz	(XDR_QUADLEN(NFS4_VERIFIER_SIZE))
86 #define encode_putfh_maxsz	(op_encode_hdr_maxsz + 1 + \
87 				(NFS4_FHSIZE >> 2))
88 #define decode_putfh_maxsz	(op_decode_hdr_maxsz)
89 #define encode_putrootfh_maxsz	(op_encode_hdr_maxsz)
90 #define decode_putrootfh_maxsz	(op_decode_hdr_maxsz)
91 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
92 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
93 				((3+NFS4_FHSIZE) >> 2))
94 #define nfs4_fattr_bitmap_maxsz 4
95 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
96 #define nfs4_name_maxsz		(1 + ((3 + NFS4_MAXNAMLEN) >> 2))
97 #define nfs4_path_maxsz		(1 + ((3 + NFS4_MAXPATHLEN) >> 2))
98 #define nfs4_owner_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
99 #define nfs4_group_maxsz	(1 + XDR_QUADLEN(IDMAP_NAMESZ))
100 /* This is based on getfattr, which uses the most attributes: */
101 #define nfs4_fattr_value_maxsz	(1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
102 				3 + 3 + 3 + nfs4_owner_maxsz + nfs4_group_maxsz))
103 #define nfs4_fattr_maxsz	(nfs4_fattr_bitmap_maxsz + \
104 				nfs4_fattr_value_maxsz)
105 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
106 #define encode_attrs_maxsz	(nfs4_fattr_bitmap_maxsz + \
107 				 1 + 2 + 1 + \
108 				nfs4_owner_maxsz + \
109 				nfs4_group_maxsz + \
110 				4 + 4)
111 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
112 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
113 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
114 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
115 #define encode_fsinfo_maxsz	(encode_getattr_maxsz)
116 /* The 5 accounts for the PNFS attributes, and assumes that at most three
117  * layout types will be returned.
118  */
119 #define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + \
120 				 nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
121 #define encode_renew_maxsz	(op_encode_hdr_maxsz + 3)
122 #define decode_renew_maxsz	(op_decode_hdr_maxsz)
123 #define encode_setclientid_maxsz \
124 				(op_encode_hdr_maxsz + \
125 				XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
126 				XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
127 				1 /* sc_prog */ + \
128 				XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
129 				XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
130 				1) /* sc_cb_ident */
131 #define decode_setclientid_maxsz \
132 				(op_decode_hdr_maxsz + \
133 				2 + \
134 				1024) /* large value for CLID_INUSE */
135 #define encode_setclientid_confirm_maxsz \
136 				(op_encode_hdr_maxsz + \
137 				3 + (NFS4_VERIFIER_SIZE >> 2))
138 #define decode_setclientid_confirm_maxsz \
139 				(op_decode_hdr_maxsz)
140 #define encode_lookup_maxsz	(op_encode_hdr_maxsz + nfs4_name_maxsz)
141 #define decode_lookup_maxsz	(op_decode_hdr_maxsz)
142 #define encode_share_access_maxsz \
143 				(2)
144 #define encode_createmode_maxsz	(1 + encode_attrs_maxsz + encode_verifier_maxsz)
145 #define encode_opentype_maxsz	(1 + encode_createmode_maxsz)
146 #define encode_claim_null_maxsz	(1 + nfs4_name_maxsz)
147 #define encode_open_maxsz	(op_encode_hdr_maxsz + \
148 				2 + encode_share_access_maxsz + 2 + \
149 				open_owner_id_maxsz + \
150 				encode_opentype_maxsz + \
151 				encode_claim_null_maxsz)
152 #define decode_ace_maxsz	(3 + nfs4_owner_maxsz)
153 #define decode_delegation_maxsz	(1 + decode_stateid_maxsz + 1 + \
154 				decode_ace_maxsz)
155 #define decode_change_info_maxsz	(5)
156 #define decode_open_maxsz	(op_decode_hdr_maxsz + \
157 				decode_stateid_maxsz + \
158 				decode_change_info_maxsz + 1 + \
159 				nfs4_fattr_bitmap_maxsz + \
160 				decode_delegation_maxsz)
161 #define encode_open_confirm_maxsz \
162 				(op_encode_hdr_maxsz + \
163 				 encode_stateid_maxsz + 1)
164 #define decode_open_confirm_maxsz \
165 				(op_decode_hdr_maxsz + \
166 				 decode_stateid_maxsz)
167 #define encode_open_downgrade_maxsz \
168 				(op_encode_hdr_maxsz + \
169 				 encode_stateid_maxsz + 1 + \
170 				 encode_share_access_maxsz)
171 #define decode_open_downgrade_maxsz \
172 				(op_decode_hdr_maxsz + \
173 				 decode_stateid_maxsz)
174 #define encode_close_maxsz	(op_encode_hdr_maxsz + \
175 				 1 + encode_stateid_maxsz)
176 #define decode_close_maxsz	(op_decode_hdr_maxsz + \
177 				 decode_stateid_maxsz)
178 #define encode_setattr_maxsz	(op_encode_hdr_maxsz + \
179 				 encode_stateid_maxsz + \
180 				 encode_attrs_maxsz)
181 #define decode_setattr_maxsz	(op_decode_hdr_maxsz + \
182 				 nfs4_fattr_bitmap_maxsz)
183 #define encode_read_maxsz	(op_encode_hdr_maxsz + \
184 				 encode_stateid_maxsz + 3)
185 #define decode_read_maxsz	(op_decode_hdr_maxsz + 2)
186 #define encode_readdir_maxsz	(op_encode_hdr_maxsz + \
187 				 2 + encode_verifier_maxsz + 5)
188 #define decode_readdir_maxsz	(op_decode_hdr_maxsz + \
189 				 decode_verifier_maxsz)
190 #define encode_readlink_maxsz	(op_encode_hdr_maxsz)
191 #define decode_readlink_maxsz	(op_decode_hdr_maxsz + 1)
192 #define encode_write_maxsz	(op_encode_hdr_maxsz + \
193 				 encode_stateid_maxsz + 4)
194 #define decode_write_maxsz	(op_decode_hdr_maxsz + \
195 				 2 + decode_verifier_maxsz)
196 #define encode_commit_maxsz	(op_encode_hdr_maxsz + 3)
197 #define decode_commit_maxsz	(op_decode_hdr_maxsz + \
198 				 decode_verifier_maxsz)
199 #define encode_remove_maxsz	(op_encode_hdr_maxsz + \
200 				nfs4_name_maxsz)
201 #define decode_remove_maxsz	(op_decode_hdr_maxsz + \
202 				 decode_change_info_maxsz)
203 #define encode_rename_maxsz	(op_encode_hdr_maxsz + \
204 				2 * nfs4_name_maxsz)
205 #define decode_rename_maxsz	(op_decode_hdr_maxsz + \
206 				 decode_change_info_maxsz + \
207 				 decode_change_info_maxsz)
208 #define encode_link_maxsz	(op_encode_hdr_maxsz + \
209 				nfs4_name_maxsz)
210 #define decode_link_maxsz	(op_decode_hdr_maxsz + decode_change_info_maxsz)
211 #define encode_lockowner_maxsz	(7)
212 #define encode_lock_maxsz	(op_encode_hdr_maxsz + \
213 				 7 + \
214 				 1 + encode_stateid_maxsz + 1 + \
215 				 encode_lockowner_maxsz)
216 #define decode_lock_denied_maxsz \
217 				(8 + decode_lockowner_maxsz)
218 #define decode_lock_maxsz	(op_decode_hdr_maxsz + \
219 				 decode_lock_denied_maxsz)
220 #define encode_lockt_maxsz	(op_encode_hdr_maxsz + 5 + \
221 				encode_lockowner_maxsz)
222 #define decode_lockt_maxsz	(op_decode_hdr_maxsz + \
223 				 decode_lock_denied_maxsz)
224 #define encode_locku_maxsz	(op_encode_hdr_maxsz + 3 + \
225 				 encode_stateid_maxsz + \
226 				 4)
227 #define decode_locku_maxsz	(op_decode_hdr_maxsz + \
228 				 decode_stateid_maxsz)
229 #define encode_release_lockowner_maxsz \
230 				(op_encode_hdr_maxsz + \
231 				 encode_lockowner_maxsz)
232 #define decode_release_lockowner_maxsz \
233 				(op_decode_hdr_maxsz)
234 #define encode_access_maxsz	(op_encode_hdr_maxsz + 1)
235 #define decode_access_maxsz	(op_decode_hdr_maxsz + 2)
236 #define encode_symlink_maxsz	(op_encode_hdr_maxsz + \
237 				1 + nfs4_name_maxsz + \
238 				1 + \
239 				nfs4_fattr_maxsz)
240 #define decode_symlink_maxsz	(op_decode_hdr_maxsz + 8)
241 #define encode_create_maxsz	(op_encode_hdr_maxsz + \
242 				1 + 2 + nfs4_name_maxsz + \
243 				encode_attrs_maxsz)
244 #define decode_create_maxsz	(op_decode_hdr_maxsz + \
245 				decode_change_info_maxsz + \
246 				nfs4_fattr_bitmap_maxsz)
247 #define encode_statfs_maxsz	(encode_getattr_maxsz)
248 #define decode_statfs_maxsz	(decode_getattr_maxsz)
249 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
250 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
251 #define encode_getacl_maxsz	(encode_getattr_maxsz)
252 #define decode_getacl_maxsz	(op_decode_hdr_maxsz + \
253 				 nfs4_fattr_bitmap_maxsz + 1)
254 #define encode_setacl_maxsz	(op_encode_hdr_maxsz + \
255 				 encode_stateid_maxsz + 3)
256 #define decode_setacl_maxsz	(decode_setattr_maxsz)
257 #define encode_fs_locations_maxsz \
258 				(encode_getattr_maxsz)
259 #define decode_fs_locations_maxsz \
260 				(0)
261 #define encode_secinfo_maxsz	(op_encode_hdr_maxsz + nfs4_name_maxsz)
262 #define decode_secinfo_maxsz	(op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
263 
264 #if defined(CONFIG_NFS_V4_1)
265 #define NFS4_MAX_MACHINE_NAME_LEN (64)
266 
267 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
268 				encode_verifier_maxsz + \
269 				1 /* co_ownerid.len */ + \
270 				XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
271 				1 /* flags */ + \
272 				1 /* spa_how */ + \
273 				0 /* SP4_NONE (for now) */ + \
274 				1 /* zero implemetation id array */)
275 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
276 				2 /* eir_clientid */ + \
277 				1 /* eir_sequenceid */ + \
278 				1 /* eir_flags */ + \
279 				1 /* spr_how */ + \
280 				0 /* SP4_NONE (for now) */ + \
281 				2 /* eir_server_owner.so_minor_id */ + \
282 				/* eir_server_owner.so_major_id<> */ \
283 				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
284 				/* eir_server_scope<> */ \
285 				XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
286 				1 /* eir_server_impl_id array length */ + \
287 				0 /* ignored eir_server_impl_id contents */)
288 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
289 #define decode_channel_attrs_maxsz  (6 + \
290 				     1 /* ca_rdma_ird.len */ + \
291 				     1 /* ca_rdma_ird */)
292 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
293 				     2 /* csa_clientid */ + \
294 				     1 /* csa_sequence */ + \
295 				     1 /* csa_flags */ + \
296 				     encode_channel_attrs_maxsz + \
297 				     encode_channel_attrs_maxsz + \
298 				     1 /* csa_cb_program */ + \
299 				     1 /* csa_sec_parms.len (1) */ + \
300 				     1 /* cb_secflavor (AUTH_SYS) */ + \
301 				     1 /* stamp */ + \
302 				     1 /* machinename.len */ + \
303 				     XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
304 				     1 /* uid */ + \
305 				     1 /* gid */ + \
306 				     1 /* gids.len (0) */)
307 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +	\
308 				     XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
309 				     1 /* csr_sequence */ + \
310 				     1 /* csr_flags */ + \
311 				     decode_channel_attrs_maxsz + \
312 				     decode_channel_attrs_maxsz)
313 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
314 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
315 #define encode_sequence_maxsz	(op_encode_hdr_maxsz + \
316 				XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
317 #define decode_sequence_maxsz	(op_decode_hdr_maxsz + \
318 				XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
319 #define encode_reclaim_complete_maxsz	(op_encode_hdr_maxsz + 4)
320 #define decode_reclaim_complete_maxsz	(op_decode_hdr_maxsz + 4)
321 #define encode_getdevicelist_maxsz (op_encode_hdr_maxsz + 4 + \
322 				encode_verifier_maxsz)
323 #define decode_getdevicelist_maxsz (op_decode_hdr_maxsz + \
324 				2 /* nfs_cookie4 gdlr_cookie */ + \
325 				decode_verifier_maxsz \
326 				  /* verifier4 gdlr_verifier */ + \
327 				1 /* gdlr_deviceid_list count */ + \
328 				XDR_QUADLEN(NFS4_PNFS_GETDEVLIST_MAXNUM * \
329 					    NFS4_DEVICEID4_SIZE) \
330 				  /* gdlr_deviceid_list */ + \
331 				1 /* bool gdlr_eof */)
332 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + 4 + \
333 				XDR_QUADLEN(NFS4_DEVICEID4_SIZE))
334 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
335 				1 /* layout type */ + \
336 				1 /* opaque devaddr4 length */ + \
337 				  /* devaddr4 payload is read into page */ \
338 				1 /* notification bitmap length */ + \
339 				1 /* notification bitmap */)
340 #define encode_layoutget_maxsz	(op_encode_hdr_maxsz + 10 + \
341 				encode_stateid_maxsz)
342 #define decode_layoutget_maxsz	(op_decode_hdr_maxsz + 8 + \
343 				decode_stateid_maxsz + \
344 				XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
345 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
346 				2 /* offset */ + \
347 				2 /* length */ + \
348 				1 /* reclaim */ + \
349 				encode_stateid_maxsz + \
350 				1 /* new offset (true) */ + \
351 				2 /* last byte written */ + \
352 				1 /* nt_timechanged (false) */ + \
353 				1 /* layoutupdate4 layout type */ + \
354 				1 /* NULL filelayout layoutupdate4 payload */)
355 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
356 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
357 				encode_stateid_maxsz + \
358 				1 /* FIXME: opaque lrf_body always empty at the moment */)
359 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
360 				1 + decode_stateid_maxsz)
361 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
362 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
363 #define encode_test_stateid_maxsz	(op_encode_hdr_maxsz + 2 + \
364 					 XDR_QUADLEN(NFS4_STATEID_SIZE))
365 #define decode_test_stateid_maxsz	(op_decode_hdr_maxsz + 2 + 1)
366 #define encode_free_stateid_maxsz	(op_encode_hdr_maxsz + 1 + \
367 					 XDR_QUADLEN(NFS4_STATEID_SIZE))
368 #define decode_free_stateid_maxsz	(op_decode_hdr_maxsz + 1)
369 #else /* CONFIG_NFS_V4_1 */
370 #define encode_sequence_maxsz	0
371 #define decode_sequence_maxsz	0
372 #endif /* CONFIG_NFS_V4_1 */
373 
374 #define NFS4_enc_compound_sz	(1024)  /* XXX: large enough? */
375 #define NFS4_dec_compound_sz	(1024)  /* XXX: large enough? */
376 #define NFS4_enc_read_sz	(compound_encode_hdr_maxsz + \
377 				encode_sequence_maxsz + \
378 				encode_putfh_maxsz + \
379 				encode_read_maxsz)
380 #define NFS4_dec_read_sz	(compound_decode_hdr_maxsz + \
381 				decode_sequence_maxsz + \
382 				decode_putfh_maxsz + \
383 				decode_read_maxsz)
384 #define NFS4_enc_readlink_sz	(compound_encode_hdr_maxsz + \
385 				encode_sequence_maxsz + \
386 				encode_putfh_maxsz + \
387 				encode_readlink_maxsz)
388 #define NFS4_dec_readlink_sz	(compound_decode_hdr_maxsz + \
389 				decode_sequence_maxsz + \
390 				decode_putfh_maxsz + \
391 				decode_readlink_maxsz)
392 #define NFS4_enc_readdir_sz	(compound_encode_hdr_maxsz + \
393 				encode_sequence_maxsz + \
394 				encode_putfh_maxsz + \
395 				encode_readdir_maxsz)
396 #define NFS4_dec_readdir_sz	(compound_decode_hdr_maxsz + \
397 				decode_sequence_maxsz + \
398 				decode_putfh_maxsz + \
399 				decode_readdir_maxsz)
400 #define NFS4_enc_write_sz	(compound_encode_hdr_maxsz + \
401 				encode_sequence_maxsz + \
402 				encode_putfh_maxsz + \
403 				encode_write_maxsz + \
404 				encode_getattr_maxsz)
405 #define NFS4_dec_write_sz	(compound_decode_hdr_maxsz + \
406 				decode_sequence_maxsz + \
407 				decode_putfh_maxsz + \
408 				decode_write_maxsz + \
409 				decode_getattr_maxsz)
410 #define NFS4_enc_commit_sz	(compound_encode_hdr_maxsz + \
411 				encode_sequence_maxsz + \
412 				encode_putfh_maxsz + \
413 				encode_commit_maxsz + \
414 				encode_getattr_maxsz)
415 #define NFS4_dec_commit_sz	(compound_decode_hdr_maxsz + \
416 				decode_sequence_maxsz + \
417 				decode_putfh_maxsz + \
418 				decode_commit_maxsz + \
419 				decode_getattr_maxsz)
420 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
421 				encode_sequence_maxsz + \
422 				encode_putfh_maxsz + \
423 				encode_savefh_maxsz + \
424 				encode_open_maxsz + \
425 				encode_getfh_maxsz + \
426 				encode_getattr_maxsz + \
427 				encode_restorefh_maxsz + \
428 				encode_getattr_maxsz)
429 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
430 				decode_sequence_maxsz + \
431 				decode_putfh_maxsz + \
432 				decode_savefh_maxsz + \
433 				decode_open_maxsz + \
434 				decode_getfh_maxsz + \
435 				decode_getattr_maxsz + \
436 				decode_restorefh_maxsz + \
437 				decode_getattr_maxsz)
438 #define NFS4_enc_open_confirm_sz \
439 				(compound_encode_hdr_maxsz + \
440 				 encode_putfh_maxsz + \
441 				 encode_open_confirm_maxsz)
442 #define NFS4_dec_open_confirm_sz \
443 				(compound_decode_hdr_maxsz + \
444 				 decode_putfh_maxsz + \
445 				 decode_open_confirm_maxsz)
446 #define NFS4_enc_open_noattr_sz	(compound_encode_hdr_maxsz + \
447 					encode_sequence_maxsz + \
448 					encode_putfh_maxsz + \
449 					encode_open_maxsz + \
450 					encode_getattr_maxsz)
451 #define NFS4_dec_open_noattr_sz	(compound_decode_hdr_maxsz + \
452 					decode_sequence_maxsz + \
453 					decode_putfh_maxsz + \
454 					decode_open_maxsz + \
455 					decode_getattr_maxsz)
456 #define NFS4_enc_open_downgrade_sz \
457 				(compound_encode_hdr_maxsz + \
458 				 encode_sequence_maxsz + \
459 				 encode_putfh_maxsz + \
460 				 encode_open_downgrade_maxsz + \
461 				 encode_getattr_maxsz)
462 #define NFS4_dec_open_downgrade_sz \
463 				(compound_decode_hdr_maxsz + \
464 				 decode_sequence_maxsz + \
465 				 decode_putfh_maxsz + \
466 				 decode_open_downgrade_maxsz + \
467 				 decode_getattr_maxsz)
468 #define NFS4_enc_close_sz	(compound_encode_hdr_maxsz + \
469 				 encode_sequence_maxsz + \
470 				 encode_putfh_maxsz + \
471 				 encode_close_maxsz + \
472 				 encode_getattr_maxsz)
473 #define NFS4_dec_close_sz	(compound_decode_hdr_maxsz + \
474 				 decode_sequence_maxsz + \
475 				 decode_putfh_maxsz + \
476 				 decode_close_maxsz + \
477 				 decode_getattr_maxsz)
478 #define NFS4_enc_setattr_sz	(compound_encode_hdr_maxsz + \
479 				 encode_sequence_maxsz + \
480 				 encode_putfh_maxsz + \
481 				 encode_setattr_maxsz + \
482 				 encode_getattr_maxsz)
483 #define NFS4_dec_setattr_sz	(compound_decode_hdr_maxsz + \
484 				 decode_sequence_maxsz + \
485 				 decode_putfh_maxsz + \
486 				 decode_setattr_maxsz + \
487 				 decode_getattr_maxsz)
488 #define NFS4_enc_fsinfo_sz	(compound_encode_hdr_maxsz + \
489 				encode_sequence_maxsz + \
490 				encode_putfh_maxsz + \
491 				encode_fsinfo_maxsz)
492 #define NFS4_dec_fsinfo_sz	(compound_decode_hdr_maxsz + \
493 				decode_sequence_maxsz + \
494 				decode_putfh_maxsz + \
495 				decode_fsinfo_maxsz)
496 #define NFS4_enc_renew_sz	(compound_encode_hdr_maxsz + \
497 				encode_renew_maxsz)
498 #define NFS4_dec_renew_sz	(compound_decode_hdr_maxsz + \
499 				decode_renew_maxsz)
500 #define NFS4_enc_setclientid_sz	(compound_encode_hdr_maxsz + \
501 				encode_setclientid_maxsz)
502 #define NFS4_dec_setclientid_sz	(compound_decode_hdr_maxsz + \
503 				decode_setclientid_maxsz)
504 #define NFS4_enc_setclientid_confirm_sz \
505 				(compound_encode_hdr_maxsz + \
506 				encode_setclientid_confirm_maxsz + \
507 				encode_putrootfh_maxsz + \
508 				encode_fsinfo_maxsz)
509 #define NFS4_dec_setclientid_confirm_sz \
510 				(compound_decode_hdr_maxsz + \
511 				decode_setclientid_confirm_maxsz + \
512 				decode_putrootfh_maxsz + \
513 				decode_fsinfo_maxsz)
514 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
515 				encode_sequence_maxsz + \
516 				encode_putfh_maxsz + \
517 				encode_lock_maxsz)
518 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
519 				decode_sequence_maxsz + \
520 				decode_putfh_maxsz + \
521 				decode_lock_maxsz)
522 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
523 				encode_sequence_maxsz + \
524 				encode_putfh_maxsz + \
525 				encode_lockt_maxsz)
526 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
527 				 decode_sequence_maxsz + \
528 				 decode_putfh_maxsz + \
529 				 decode_lockt_maxsz)
530 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
531 				encode_sequence_maxsz + \
532 				encode_putfh_maxsz + \
533 				encode_locku_maxsz)
534 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
535 				decode_sequence_maxsz + \
536 				decode_putfh_maxsz + \
537 				decode_locku_maxsz)
538 #define NFS4_enc_release_lockowner_sz \
539 				(compound_encode_hdr_maxsz + \
540 				 encode_lockowner_maxsz)
541 #define NFS4_dec_release_lockowner_sz \
542 				(compound_decode_hdr_maxsz + \
543 				 decode_lockowner_maxsz)
544 #define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
545 				encode_sequence_maxsz + \
546 				encode_putfh_maxsz + \
547 				encode_access_maxsz + \
548 				encode_getattr_maxsz)
549 #define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
550 				decode_sequence_maxsz + \
551 				decode_putfh_maxsz + \
552 				decode_access_maxsz + \
553 				decode_getattr_maxsz)
554 #define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
555 				encode_sequence_maxsz + \
556 				encode_putfh_maxsz + \
557 				encode_getattr_maxsz)
558 #define NFS4_dec_getattr_sz	(compound_decode_hdr_maxsz + \
559 				decode_sequence_maxsz + \
560 				decode_putfh_maxsz + \
561 				decode_getattr_maxsz)
562 #define NFS4_enc_lookup_sz	(compound_encode_hdr_maxsz + \
563 				encode_sequence_maxsz + \
564 				encode_putfh_maxsz + \
565 				encode_lookup_maxsz + \
566 				encode_getattr_maxsz + \
567 				encode_getfh_maxsz)
568 #define NFS4_dec_lookup_sz	(compound_decode_hdr_maxsz + \
569 				decode_sequence_maxsz + \
570 				decode_putfh_maxsz + \
571 				decode_lookup_maxsz + \
572 				decode_getattr_maxsz + \
573 				decode_getfh_maxsz)
574 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
575 				encode_sequence_maxsz + \
576 				encode_putrootfh_maxsz + \
577 				encode_getattr_maxsz + \
578 				encode_getfh_maxsz)
579 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
580 				decode_sequence_maxsz + \
581 				decode_putrootfh_maxsz + \
582 				decode_getattr_maxsz + \
583 				decode_getfh_maxsz)
584 #define NFS4_enc_remove_sz	(compound_encode_hdr_maxsz + \
585 				encode_sequence_maxsz + \
586 				encode_putfh_maxsz + \
587 				encode_remove_maxsz + \
588 				encode_getattr_maxsz)
589 #define NFS4_dec_remove_sz	(compound_decode_hdr_maxsz + \
590 				decode_sequence_maxsz + \
591 				decode_putfh_maxsz + \
592 				decode_remove_maxsz + \
593 				decode_getattr_maxsz)
594 #define NFS4_enc_rename_sz	(compound_encode_hdr_maxsz + \
595 				encode_sequence_maxsz + \
596 				encode_putfh_maxsz + \
597 				encode_savefh_maxsz + \
598 				encode_putfh_maxsz + \
599 				encode_rename_maxsz + \
600 				encode_getattr_maxsz + \
601 				encode_restorefh_maxsz + \
602 				encode_getattr_maxsz)
603 #define NFS4_dec_rename_sz	(compound_decode_hdr_maxsz + \
604 				decode_sequence_maxsz + \
605 				decode_putfh_maxsz + \
606 				decode_savefh_maxsz + \
607 				decode_putfh_maxsz + \
608 				decode_rename_maxsz + \
609 				decode_getattr_maxsz + \
610 				decode_restorefh_maxsz + \
611 				decode_getattr_maxsz)
612 #define NFS4_enc_link_sz	(compound_encode_hdr_maxsz + \
613 				encode_sequence_maxsz + \
614 				encode_putfh_maxsz + \
615 				encode_savefh_maxsz + \
616 				encode_putfh_maxsz + \
617 				encode_link_maxsz + \
618 				decode_getattr_maxsz + \
619 				encode_restorefh_maxsz + \
620 				decode_getattr_maxsz)
621 #define NFS4_dec_link_sz	(compound_decode_hdr_maxsz + \
622 				decode_sequence_maxsz + \
623 				decode_putfh_maxsz + \
624 				decode_savefh_maxsz + \
625 				decode_putfh_maxsz + \
626 				decode_link_maxsz + \
627 				decode_getattr_maxsz + \
628 				decode_restorefh_maxsz + \
629 				decode_getattr_maxsz)
630 #define NFS4_enc_symlink_sz	(compound_encode_hdr_maxsz + \
631 				encode_sequence_maxsz + \
632 				encode_putfh_maxsz + \
633 				encode_symlink_maxsz + \
634 				encode_getattr_maxsz + \
635 				encode_getfh_maxsz)
636 #define NFS4_dec_symlink_sz	(compound_decode_hdr_maxsz + \
637 				decode_sequence_maxsz + \
638 				decode_putfh_maxsz + \
639 				decode_symlink_maxsz + \
640 				decode_getattr_maxsz + \
641 				decode_getfh_maxsz)
642 #define NFS4_enc_create_sz	(compound_encode_hdr_maxsz + \
643 				encode_sequence_maxsz + \
644 				encode_putfh_maxsz + \
645 				encode_savefh_maxsz + \
646 				encode_create_maxsz + \
647 				encode_getfh_maxsz + \
648 				encode_getattr_maxsz + \
649 				encode_restorefh_maxsz + \
650 				encode_getattr_maxsz)
651 #define NFS4_dec_create_sz	(compound_decode_hdr_maxsz + \
652 				decode_sequence_maxsz + \
653 				decode_putfh_maxsz + \
654 				decode_savefh_maxsz + \
655 				decode_create_maxsz + \
656 				decode_getfh_maxsz + \
657 				decode_getattr_maxsz + \
658 				decode_restorefh_maxsz + \
659 				decode_getattr_maxsz)
660 #define NFS4_enc_pathconf_sz	(compound_encode_hdr_maxsz + \
661 				encode_sequence_maxsz + \
662 				encode_putfh_maxsz + \
663 				encode_getattr_maxsz)
664 #define NFS4_dec_pathconf_sz	(compound_decode_hdr_maxsz + \
665 				decode_sequence_maxsz + \
666 				decode_putfh_maxsz + \
667 				decode_getattr_maxsz)
668 #define NFS4_enc_statfs_sz	(compound_encode_hdr_maxsz + \
669 				encode_sequence_maxsz + \
670 				encode_putfh_maxsz + \
671 				encode_statfs_maxsz)
672 #define NFS4_dec_statfs_sz	(compound_decode_hdr_maxsz + \
673 				decode_sequence_maxsz + \
674 				decode_putfh_maxsz + \
675 				decode_statfs_maxsz)
676 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
677 				encode_sequence_maxsz + \
678 				encode_putfh_maxsz + \
679 				encode_getattr_maxsz)
680 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
681 				decode_sequence_maxsz + \
682 				decode_putfh_maxsz + \
683 				decode_getattr_maxsz)
684 #define NFS4_enc_delegreturn_sz	(compound_encode_hdr_maxsz + \
685 				encode_sequence_maxsz + \
686 				encode_putfh_maxsz + \
687 				encode_delegreturn_maxsz + \
688 				encode_getattr_maxsz)
689 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
690 				decode_sequence_maxsz + \
691 				decode_delegreturn_maxsz + \
692 				decode_getattr_maxsz)
693 #define NFS4_enc_getacl_sz	(compound_encode_hdr_maxsz + \
694 				encode_sequence_maxsz + \
695 				encode_putfh_maxsz + \
696 				encode_getacl_maxsz)
697 #define NFS4_dec_getacl_sz	(compound_decode_hdr_maxsz + \
698 				decode_sequence_maxsz + \
699 				decode_putfh_maxsz + \
700 				decode_getacl_maxsz)
701 #define NFS4_enc_setacl_sz	(compound_encode_hdr_maxsz + \
702 				encode_sequence_maxsz + \
703 				encode_putfh_maxsz + \
704 				encode_setacl_maxsz)
705 #define NFS4_dec_setacl_sz	(compound_decode_hdr_maxsz + \
706 				decode_sequence_maxsz + \
707 				decode_putfh_maxsz + \
708 				decode_setacl_maxsz)
709 #define NFS4_enc_fs_locations_sz \
710 				(compound_encode_hdr_maxsz + \
711 				 encode_sequence_maxsz + \
712 				 encode_putfh_maxsz + \
713 				 encode_lookup_maxsz + \
714 				 encode_fs_locations_maxsz)
715 #define NFS4_dec_fs_locations_sz \
716 				(compound_decode_hdr_maxsz + \
717 				 decode_sequence_maxsz + \
718 				 decode_putfh_maxsz + \
719 				 decode_lookup_maxsz + \
720 				 decode_fs_locations_maxsz)
721 #define NFS4_enc_secinfo_sz 	(compound_encode_hdr_maxsz + \
722 				encode_sequence_maxsz + \
723 				encode_putfh_maxsz + \
724 				encode_secinfo_maxsz)
725 #define NFS4_dec_secinfo_sz	(compound_decode_hdr_maxsz + \
726 				decode_sequence_maxsz + \
727 				decode_putfh_maxsz + \
728 				decode_secinfo_maxsz)
729 #if defined(CONFIG_NFS_V4_1)
730 #define NFS4_enc_exchange_id_sz \
731 				(compound_encode_hdr_maxsz + \
732 				 encode_exchange_id_maxsz)
733 #define NFS4_dec_exchange_id_sz \
734 				(compound_decode_hdr_maxsz + \
735 				 decode_exchange_id_maxsz)
736 #define NFS4_enc_create_session_sz \
737 				(compound_encode_hdr_maxsz + \
738 				 encode_create_session_maxsz)
739 #define NFS4_dec_create_session_sz \
740 				(compound_decode_hdr_maxsz + \
741 				 decode_create_session_maxsz)
742 #define NFS4_enc_destroy_session_sz	(compound_encode_hdr_maxsz + \
743 					 encode_destroy_session_maxsz)
744 #define NFS4_dec_destroy_session_sz	(compound_decode_hdr_maxsz + \
745 					 decode_destroy_session_maxsz)
746 #define NFS4_enc_sequence_sz \
747 				(compound_decode_hdr_maxsz + \
748 				 encode_sequence_maxsz)
749 #define NFS4_dec_sequence_sz \
750 				(compound_decode_hdr_maxsz + \
751 				 decode_sequence_maxsz)
752 #define NFS4_enc_get_lease_time_sz	(compound_encode_hdr_maxsz + \
753 					 encode_sequence_maxsz + \
754 					 encode_putrootfh_maxsz + \
755 					 encode_fsinfo_maxsz)
756 #define NFS4_dec_get_lease_time_sz	(compound_decode_hdr_maxsz + \
757 					 decode_sequence_maxsz + \
758 					 decode_putrootfh_maxsz + \
759 					 decode_fsinfo_maxsz)
760 #define NFS4_enc_reclaim_complete_sz	(compound_encode_hdr_maxsz + \
761 					 encode_sequence_maxsz + \
762 					 encode_reclaim_complete_maxsz)
763 #define NFS4_dec_reclaim_complete_sz	(compound_decode_hdr_maxsz + \
764 					 decode_sequence_maxsz + \
765 					 decode_reclaim_complete_maxsz)
766 #define NFS4_enc_getdevicelist_sz (compound_encode_hdr_maxsz + \
767 				encode_sequence_maxsz + \
768 				encode_putfh_maxsz + \
769 				encode_getdevicelist_maxsz)
770 #define NFS4_dec_getdevicelist_sz (compound_decode_hdr_maxsz + \
771 				decode_sequence_maxsz + \
772 				decode_putfh_maxsz + \
773 				decode_getdevicelist_maxsz)
774 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
775 				encode_sequence_maxsz +\
776 				encode_getdeviceinfo_maxsz)
777 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
778 				decode_sequence_maxsz + \
779 				decode_getdeviceinfo_maxsz)
780 #define NFS4_enc_layoutget_sz	(compound_encode_hdr_maxsz + \
781 				encode_sequence_maxsz + \
782 				encode_putfh_maxsz +        \
783 				encode_layoutget_maxsz)
784 #define NFS4_dec_layoutget_sz	(compound_decode_hdr_maxsz + \
785 				decode_sequence_maxsz + \
786 				decode_putfh_maxsz +        \
787 				decode_layoutget_maxsz)
788 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
789 				encode_sequence_maxsz +\
790 				encode_putfh_maxsz + \
791 				encode_layoutcommit_maxsz + \
792 				encode_getattr_maxsz)
793 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
794 				decode_sequence_maxsz + \
795 				decode_putfh_maxsz + \
796 				decode_layoutcommit_maxsz + \
797 				decode_getattr_maxsz)
798 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
799 				encode_sequence_maxsz + \
800 				encode_putfh_maxsz + \
801 				encode_layoutreturn_maxsz)
802 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
803 				decode_sequence_maxsz + \
804 				decode_putfh_maxsz + \
805 				decode_layoutreturn_maxsz)
806 #define NFS4_enc_secinfo_no_name_sz	(compound_encode_hdr_maxsz + \
807 					encode_sequence_maxsz + \
808 					encode_putrootfh_maxsz +\
809 					encode_secinfo_no_name_maxsz)
810 #define NFS4_dec_secinfo_no_name_sz	(compound_decode_hdr_maxsz + \
811 					decode_sequence_maxsz + \
812 					decode_putrootfh_maxsz + \
813 					decode_secinfo_no_name_maxsz)
814 #define NFS4_enc_test_stateid_sz	(compound_encode_hdr_maxsz + \
815 					 encode_sequence_maxsz + \
816 					 encode_test_stateid_maxsz)
817 #define NFS4_dec_test_stateid_sz	(compound_decode_hdr_maxsz + \
818 					 decode_sequence_maxsz + \
819 					 decode_test_stateid_maxsz)
820 #define NFS4_enc_free_stateid_sz	(compound_encode_hdr_maxsz + \
821 					 encode_sequence_maxsz + \
822 					 encode_free_stateid_maxsz)
823 #define NFS4_dec_free_stateid_sz	(compound_decode_hdr_maxsz + \
824 					 decode_sequence_maxsz + \
825 					 decode_free_stateid_maxsz)
826 
827 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
828 				      compound_encode_hdr_maxsz +
829 				      encode_sequence_maxsz +
830 				      encode_putfh_maxsz +
831 				      encode_getattr_maxsz) *
832 				     XDR_UNIT);
833 
834 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
835 				     compound_decode_hdr_maxsz +
836 				     decode_sequence_maxsz +
837 				     decode_putfh_maxsz) *
838 				    XDR_UNIT);
839 #endif /* CONFIG_NFS_V4_1 */
840 
841 static const umode_t nfs_type2fmt[] = {
842 	[NF4BAD] = 0,
843 	[NF4REG] = S_IFREG,
844 	[NF4DIR] = S_IFDIR,
845 	[NF4BLK] = S_IFBLK,
846 	[NF4CHR] = S_IFCHR,
847 	[NF4LNK] = S_IFLNK,
848 	[NF4SOCK] = S_IFSOCK,
849 	[NF4FIFO] = S_IFIFO,
850 	[NF4ATTRDIR] = 0,
851 	[NF4NAMEDATTR] = 0,
852 };
853 
854 struct compound_hdr {
855 	int32_t		status;
856 	uint32_t	nops;
857 	__be32 *	nops_p;
858 	uint32_t	taglen;
859 	char *		tag;
860 	uint32_t	replen;		/* expected reply words */
861 	u32		minorversion;
862 };
863 
864 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
865 {
866 	__be32 *p = xdr_reserve_space(xdr, nbytes);
867 	BUG_ON(!p);
868 	return p;
869 }
870 
871 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
872 {
873 	__be32 *p;
874 
875 	p = xdr_reserve_space(xdr, 4 + len);
876 	BUG_ON(p == NULL);
877 	xdr_encode_opaque(p, str, len);
878 }
879 
880 static void encode_compound_hdr(struct xdr_stream *xdr,
881 				struct rpc_rqst *req,
882 				struct compound_hdr *hdr)
883 {
884 	__be32 *p;
885 	struct rpc_auth *auth = req->rq_cred->cr_auth;
886 
887 	/* initialize running count of expected bytes in reply.
888 	 * NOTE: the replied tag SHOULD be the same is the one sent,
889 	 * but this is not required as a MUST for the server to do so. */
890 	hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
891 
892 	dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
893 	BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
894 	p = reserve_space(xdr, 4 + hdr->taglen + 8);
895 	p = xdr_encode_opaque(p, hdr->tag, hdr->taglen);
896 	*p++ = cpu_to_be32(hdr->minorversion);
897 	hdr->nops_p = p;
898 	*p = cpu_to_be32(hdr->nops);
899 }
900 
901 static void encode_nops(struct compound_hdr *hdr)
902 {
903 	BUG_ON(hdr->nops > NFS4_MAX_OPS);
904 	*hdr->nops_p = htonl(hdr->nops);
905 }
906 
907 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
908 {
909 	__be32 *p;
910 
911 	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
912 	BUG_ON(p == NULL);
913 	xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
914 }
915 
916 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
917 {
918 	char owner_name[IDMAP_NAMESZ];
919 	char owner_group[IDMAP_NAMESZ];
920 	int owner_namelen = 0;
921 	int owner_grouplen = 0;
922 	__be32 *p;
923 	__be32 *q;
924 	int len;
925 	uint32_t bmval0 = 0;
926 	uint32_t bmval1 = 0;
927 
928 	/*
929 	 * We reserve enough space to write the entire attribute buffer at once.
930 	 * In the worst-case, this would be
931 	 *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
932 	 *          = 36 bytes, plus any contribution from variable-length fields
933 	 *            such as owner/group.
934 	 */
935 	len = 16;
936 
937 	/* Sigh */
938 	if (iap->ia_valid & ATTR_SIZE)
939 		len += 8;
940 	if (iap->ia_valid & ATTR_MODE)
941 		len += 4;
942 	if (iap->ia_valid & ATTR_UID) {
943 		owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
944 		if (owner_namelen < 0) {
945 			dprintk("nfs: couldn't resolve uid %d to string\n",
946 					iap->ia_uid);
947 			/* XXX */
948 			strcpy(owner_name, "nobody");
949 			owner_namelen = sizeof("nobody") - 1;
950 			/* goto out; */
951 		}
952 		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
953 	}
954 	if (iap->ia_valid & ATTR_GID) {
955 		owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
956 		if (owner_grouplen < 0) {
957 			dprintk("nfs: couldn't resolve gid %d to string\n",
958 					iap->ia_gid);
959 			strcpy(owner_group, "nobody");
960 			owner_grouplen = sizeof("nobody") - 1;
961 			/* goto out; */
962 		}
963 		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
964 	}
965 	if (iap->ia_valid & ATTR_ATIME_SET)
966 		len += 16;
967 	else if (iap->ia_valid & ATTR_ATIME)
968 		len += 4;
969 	if (iap->ia_valid & ATTR_MTIME_SET)
970 		len += 16;
971 	else if (iap->ia_valid & ATTR_MTIME)
972 		len += 4;
973 	p = reserve_space(xdr, len);
974 
975 	/*
976 	 * We write the bitmap length now, but leave the bitmap and the attribute
977 	 * buffer length to be backfilled at the end of this routine.
978 	 */
979 	*p++ = cpu_to_be32(2);
980 	q = p;
981 	p += 3;
982 
983 	if (iap->ia_valid & ATTR_SIZE) {
984 		bmval0 |= FATTR4_WORD0_SIZE;
985 		p = xdr_encode_hyper(p, iap->ia_size);
986 	}
987 	if (iap->ia_valid & ATTR_MODE) {
988 		bmval1 |= FATTR4_WORD1_MODE;
989 		*p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
990 	}
991 	if (iap->ia_valid & ATTR_UID) {
992 		bmval1 |= FATTR4_WORD1_OWNER;
993 		p = xdr_encode_opaque(p, owner_name, owner_namelen);
994 	}
995 	if (iap->ia_valid & ATTR_GID) {
996 		bmval1 |= FATTR4_WORD1_OWNER_GROUP;
997 		p = xdr_encode_opaque(p, owner_group, owner_grouplen);
998 	}
999 	if (iap->ia_valid & ATTR_ATIME_SET) {
1000 		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
1001 		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1002 		*p++ = cpu_to_be32(0);
1003 		*p++ = cpu_to_be32(iap->ia_atime.tv_sec);
1004 		*p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
1005 	}
1006 	else if (iap->ia_valid & ATTR_ATIME) {
1007 		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
1008 		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1009 	}
1010 	if (iap->ia_valid & ATTR_MTIME_SET) {
1011 		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
1012 		*p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1013 		*p++ = cpu_to_be32(0);
1014 		*p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
1015 		*p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
1016 	}
1017 	else if (iap->ia_valid & ATTR_MTIME) {
1018 		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
1019 		*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1020 	}
1021 
1022 	/*
1023 	 * Now we backfill the bitmap and the attribute buffer length.
1024 	 */
1025 	if (len != ((char *)p - (char *)q) + 4) {
1026 		printk(KERN_ERR "nfs: Attr length error, %u != %Zu\n",
1027 				len, ((char *)p - (char *)q) + 4);
1028 		BUG();
1029 	}
1030 	len = (char *)p - (char *)q - 12;
1031 	*q++ = htonl(bmval0);
1032 	*q++ = htonl(bmval1);
1033 	*q = htonl(len);
1034 
1035 /* out: */
1036 }
1037 
1038 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1039 {
1040 	__be32 *p;
1041 
1042 	p = reserve_space(xdr, 8);
1043 	*p++ = cpu_to_be32(OP_ACCESS);
1044 	*p = cpu_to_be32(access);
1045 	hdr->nops++;
1046 	hdr->replen += decode_access_maxsz;
1047 }
1048 
1049 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1050 {
1051 	__be32 *p;
1052 
1053 	p = reserve_space(xdr, 8+NFS4_STATEID_SIZE);
1054 	*p++ = cpu_to_be32(OP_CLOSE);
1055 	*p++ = cpu_to_be32(arg->seqid->sequence->counter);
1056 	xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1057 	hdr->nops++;
1058 	hdr->replen += decode_close_maxsz;
1059 }
1060 
1061 static void encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1062 {
1063 	__be32 *p;
1064 
1065 	p = reserve_space(xdr, 16);
1066 	*p++ = cpu_to_be32(OP_COMMIT);
1067 	p = xdr_encode_hyper(p, args->offset);
1068 	*p = cpu_to_be32(args->count);
1069 	hdr->nops++;
1070 	hdr->replen += decode_commit_maxsz;
1071 }
1072 
1073 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1074 {
1075 	__be32 *p;
1076 
1077 	p = reserve_space(xdr, 8);
1078 	*p++ = cpu_to_be32(OP_CREATE);
1079 	*p = cpu_to_be32(create->ftype);
1080 
1081 	switch (create->ftype) {
1082 	case NF4LNK:
1083 		p = reserve_space(xdr, 4);
1084 		*p = cpu_to_be32(create->u.symlink.len);
1085 		xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
1086 		break;
1087 
1088 	case NF4BLK: case NF4CHR:
1089 		p = reserve_space(xdr, 8);
1090 		*p++ = cpu_to_be32(create->u.device.specdata1);
1091 		*p = cpu_to_be32(create->u.device.specdata2);
1092 		break;
1093 
1094 	default:
1095 		break;
1096 	}
1097 
1098 	encode_string(xdr, create->name->len, create->name->name);
1099 	hdr->nops++;
1100 	hdr->replen += decode_create_maxsz;
1101 
1102 	encode_attrs(xdr, create->attrs, create->server);
1103 }
1104 
1105 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
1106 {
1107 	__be32 *p;
1108 
1109 	p = reserve_space(xdr, 12);
1110 	*p++ = cpu_to_be32(OP_GETATTR);
1111 	*p++ = cpu_to_be32(1);
1112 	*p = cpu_to_be32(bitmap);
1113 	hdr->nops++;
1114 	hdr->replen += decode_getattr_maxsz;
1115 }
1116 
1117 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
1118 {
1119 	__be32 *p;
1120 
1121 	p = reserve_space(xdr, 16);
1122 	*p++ = cpu_to_be32(OP_GETATTR);
1123 	*p++ = cpu_to_be32(2);
1124 	*p++ = cpu_to_be32(bm0);
1125 	*p = cpu_to_be32(bm1);
1126 	hdr->nops++;
1127 	hdr->replen += decode_getattr_maxsz;
1128 }
1129 
1130 static void
1131 encode_getattr_three(struct xdr_stream *xdr,
1132 		     uint32_t bm0, uint32_t bm1, uint32_t bm2,
1133 		     struct compound_hdr *hdr)
1134 {
1135 	__be32 *p;
1136 
1137 	p = reserve_space(xdr, 4);
1138 	*p = cpu_to_be32(OP_GETATTR);
1139 	if (bm2) {
1140 		p = reserve_space(xdr, 16);
1141 		*p++ = cpu_to_be32(3);
1142 		*p++ = cpu_to_be32(bm0);
1143 		*p++ = cpu_to_be32(bm1);
1144 		*p = cpu_to_be32(bm2);
1145 	} else if (bm1) {
1146 		p = reserve_space(xdr, 12);
1147 		*p++ = cpu_to_be32(2);
1148 		*p++ = cpu_to_be32(bm0);
1149 		*p = cpu_to_be32(bm1);
1150 	} else {
1151 		p = reserve_space(xdr, 8);
1152 		*p++ = cpu_to_be32(1);
1153 		*p = cpu_to_be32(bm0);
1154 	}
1155 	hdr->nops++;
1156 	hdr->replen += decode_getattr_maxsz;
1157 }
1158 
1159 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1160 {
1161 	encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1162 			   bitmask[1] & nfs4_fattr_bitmap[1], hdr);
1163 }
1164 
1165 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1166 {
1167 	encode_getattr_three(xdr,
1168 			     bitmask[0] & nfs4_fsinfo_bitmap[0],
1169 			     bitmask[1] & nfs4_fsinfo_bitmap[1],
1170 			     bitmask[2] & nfs4_fsinfo_bitmap[2],
1171 			     hdr);
1172 }
1173 
1174 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1175 {
1176 	encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1177 			   bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1178 }
1179 
1180 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1181 {
1182 	__be32 *p;
1183 
1184 	p = reserve_space(xdr, 4);
1185 	*p = cpu_to_be32(OP_GETFH);
1186 	hdr->nops++;
1187 	hdr->replen += decode_getfh_maxsz;
1188 }
1189 
1190 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1191 {
1192 	__be32 *p;
1193 
1194 	p = reserve_space(xdr, 8 + name->len);
1195 	*p++ = cpu_to_be32(OP_LINK);
1196 	xdr_encode_opaque(p, name->name, name->len);
1197 	hdr->nops++;
1198 	hdr->replen += decode_link_maxsz;
1199 }
1200 
1201 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1202 {
1203 	if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
1204 		return block ? NFS4_READW_LT : NFS4_READ_LT;
1205 	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1206 }
1207 
1208 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1209 {
1210 	if (fl->fl_end == OFFSET_MAX)
1211 		return ~(uint64_t)0;
1212 	return fl->fl_end - fl->fl_start + 1;
1213 }
1214 
1215 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1216 {
1217 	__be32 *p;
1218 
1219 	p = reserve_space(xdr, 32);
1220 	p = xdr_encode_hyper(p, lowner->clientid);
1221 	*p++ = cpu_to_be32(20);
1222 	p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1223 	*p++ = cpu_to_be32(lowner->s_dev);
1224 	xdr_encode_hyper(p, lowner->id);
1225 }
1226 
1227 /*
1228  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1229  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1230  */
1231 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1232 {
1233 	__be32 *p;
1234 
1235 	p = reserve_space(xdr, 32);
1236 	*p++ = cpu_to_be32(OP_LOCK);
1237 	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1238 	*p++ = cpu_to_be32(args->reclaim);
1239 	p = xdr_encode_hyper(p, args->fl->fl_start);
1240 	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1241 	*p = cpu_to_be32(args->new_lock_owner);
1242 	if (args->new_lock_owner){
1243 		p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1244 		*p++ = cpu_to_be32(args->open_seqid->sequence->counter);
1245 		p = xdr_encode_opaque_fixed(p, args->open_stateid->data, NFS4_STATEID_SIZE);
1246 		*p++ = cpu_to_be32(args->lock_seqid->sequence->counter);
1247 		encode_lockowner(xdr, &args->lock_owner);
1248 	}
1249 	else {
1250 		p = reserve_space(xdr, NFS4_STATEID_SIZE+4);
1251 		p = xdr_encode_opaque_fixed(p, args->lock_stateid->data, NFS4_STATEID_SIZE);
1252 		*p = cpu_to_be32(args->lock_seqid->sequence->counter);
1253 	}
1254 	hdr->nops++;
1255 	hdr->replen += decode_lock_maxsz;
1256 }
1257 
1258 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1259 {
1260 	__be32 *p;
1261 
1262 	p = reserve_space(xdr, 24);
1263 	*p++ = cpu_to_be32(OP_LOCKT);
1264 	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1265 	p = xdr_encode_hyper(p, args->fl->fl_start);
1266 	p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1267 	encode_lockowner(xdr, &args->lock_owner);
1268 	hdr->nops++;
1269 	hdr->replen += decode_lockt_maxsz;
1270 }
1271 
1272 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1273 {
1274 	__be32 *p;
1275 
1276 	p = reserve_space(xdr, 12+NFS4_STATEID_SIZE+16);
1277 	*p++ = cpu_to_be32(OP_LOCKU);
1278 	*p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1279 	*p++ = cpu_to_be32(args->seqid->sequence->counter);
1280 	p = xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
1281 	p = xdr_encode_hyper(p, args->fl->fl_start);
1282 	xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1283 	hdr->nops++;
1284 	hdr->replen += decode_locku_maxsz;
1285 }
1286 
1287 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1288 {
1289 	__be32 *p;
1290 
1291 	p = reserve_space(xdr, 4);
1292 	*p = cpu_to_be32(OP_RELEASE_LOCKOWNER);
1293 	encode_lockowner(xdr, lowner);
1294 	hdr->nops++;
1295 	hdr->replen += decode_release_lockowner_maxsz;
1296 }
1297 
1298 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1299 {
1300 	int len = name->len;
1301 	__be32 *p;
1302 
1303 	p = reserve_space(xdr, 8 + len);
1304 	*p++ = cpu_to_be32(OP_LOOKUP);
1305 	xdr_encode_opaque(p, name->name, len);
1306 	hdr->nops++;
1307 	hdr->replen += decode_lookup_maxsz;
1308 }
1309 
1310 static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
1311 {
1312 	__be32 *p;
1313 
1314 	p = reserve_space(xdr, 8);
1315 	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1316 	case FMODE_READ:
1317 		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
1318 		break;
1319 	case FMODE_WRITE:
1320 		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
1321 		break;
1322 	case FMODE_READ|FMODE_WRITE:
1323 		*p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
1324 		break;
1325 	default:
1326 		*p++ = cpu_to_be32(0);
1327 	}
1328 	*p = cpu_to_be32(0);		/* for linux, share_deny = 0 always */
1329 }
1330 
1331 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1332 {
1333 	__be32 *p;
1334  /*
1335  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1336  * owner 4 = 32
1337  */
1338 	p = reserve_space(xdr, 8);
1339 	*p++ = cpu_to_be32(OP_OPEN);
1340 	*p = cpu_to_be32(arg->seqid->sequence->counter);
1341 	encode_share_access(xdr, arg->fmode);
1342 	p = reserve_space(xdr, 32);
1343 	p = xdr_encode_hyper(p, arg->clientid);
1344 	*p++ = cpu_to_be32(20);
1345 	p = xdr_encode_opaque_fixed(p, "open id:", 8);
1346 	*p++ = cpu_to_be32(arg->server->s_dev);
1347 	xdr_encode_hyper(p, arg->id);
1348 }
1349 
1350 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1351 {
1352 	__be32 *p;
1353 	struct nfs_client *clp;
1354 
1355 	p = reserve_space(xdr, 4);
1356 	switch(arg->open_flags & O_EXCL) {
1357 	case 0:
1358 		*p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1359 		encode_attrs(xdr, arg->u.attrs, arg->server);
1360 		break;
1361 	default:
1362 		clp = arg->server->nfs_client;
1363 		if (clp->cl_mvops->minor_version > 0) {
1364 			if (nfs4_has_persistent_session(clp)) {
1365 				*p = cpu_to_be32(NFS4_CREATE_GUARDED);
1366 				encode_attrs(xdr, arg->u.attrs, arg->server);
1367 			} else {
1368 				struct iattr dummy;
1369 
1370 				*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1371 				encode_nfs4_verifier(xdr, &arg->u.verifier);
1372 				dummy.ia_valid = 0;
1373 				encode_attrs(xdr, &dummy, arg->server);
1374 			}
1375 		} else {
1376 			*p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1377 			encode_nfs4_verifier(xdr, &arg->u.verifier);
1378 		}
1379 	}
1380 }
1381 
1382 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1383 {
1384 	__be32 *p;
1385 
1386 	p = reserve_space(xdr, 4);
1387 	switch (arg->open_flags & O_CREAT) {
1388 	case 0:
1389 		*p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1390 		break;
1391 	default:
1392 		BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
1393 		*p = cpu_to_be32(NFS4_OPEN_CREATE);
1394 		encode_createmode(xdr, arg);
1395 	}
1396 }
1397 
1398 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1399 {
1400 	__be32 *p;
1401 
1402 	p = reserve_space(xdr, 4);
1403 	switch (delegation_type) {
1404 	case 0:
1405 		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1406 		break;
1407 	case FMODE_READ:
1408 		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1409 		break;
1410 	case FMODE_WRITE|FMODE_READ:
1411 		*p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1412 		break;
1413 	default:
1414 		BUG();
1415 	}
1416 }
1417 
1418 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1419 {
1420 	__be32 *p;
1421 
1422 	p = reserve_space(xdr, 4);
1423 	*p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1424 	encode_string(xdr, name->len, name->name);
1425 }
1426 
1427 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1428 {
1429 	__be32 *p;
1430 
1431 	p = reserve_space(xdr, 4);
1432 	*p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1433 	encode_delegation_type(xdr, type);
1434 }
1435 
1436 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1437 {
1438 	__be32 *p;
1439 
1440 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1441 	*p++ = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1442 	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1443 	encode_string(xdr, name->len, name->name);
1444 }
1445 
1446 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1447 {
1448 	encode_openhdr(xdr, arg);
1449 	encode_opentype(xdr, arg);
1450 	switch (arg->claim) {
1451 	case NFS4_OPEN_CLAIM_NULL:
1452 		encode_claim_null(xdr, arg->name);
1453 		break;
1454 	case NFS4_OPEN_CLAIM_PREVIOUS:
1455 		encode_claim_previous(xdr, arg->u.delegation_type);
1456 		break;
1457 	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1458 		encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1459 		break;
1460 	default:
1461 		BUG();
1462 	}
1463 	hdr->nops++;
1464 	hdr->replen += decode_open_maxsz;
1465 }
1466 
1467 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1468 {
1469 	__be32 *p;
1470 
1471 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1472 	*p++ = cpu_to_be32(OP_OPEN_CONFIRM);
1473 	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1474 	*p = cpu_to_be32(arg->seqid->sequence->counter);
1475 	hdr->nops++;
1476 	hdr->replen += decode_open_confirm_maxsz;
1477 }
1478 
1479 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1480 {
1481 	__be32 *p;
1482 
1483 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE+4);
1484 	*p++ = cpu_to_be32(OP_OPEN_DOWNGRADE);
1485 	p = xdr_encode_opaque_fixed(p, arg->stateid->data, NFS4_STATEID_SIZE);
1486 	*p = cpu_to_be32(arg->seqid->sequence->counter);
1487 	encode_share_access(xdr, arg->fmode);
1488 	hdr->nops++;
1489 	hdr->replen += decode_open_downgrade_maxsz;
1490 }
1491 
1492 static void
1493 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1494 {
1495 	int len = fh->size;
1496 	__be32 *p;
1497 
1498 	p = reserve_space(xdr, 8 + len);
1499 	*p++ = cpu_to_be32(OP_PUTFH);
1500 	xdr_encode_opaque(p, fh->data, len);
1501 	hdr->nops++;
1502 	hdr->replen += decode_putfh_maxsz;
1503 }
1504 
1505 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1506 {
1507 	__be32 *p;
1508 
1509 	p = reserve_space(xdr, 4);
1510 	*p = cpu_to_be32(OP_PUTROOTFH);
1511 	hdr->nops++;
1512 	hdr->replen += decode_putrootfh_maxsz;
1513 }
1514 
1515 static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx, const struct nfs_lock_context *l_ctx, int zero_seqid)
1516 {
1517 	nfs4_stateid stateid;
1518 	__be32 *p;
1519 
1520 	p = reserve_space(xdr, NFS4_STATEID_SIZE);
1521 	if (ctx->state != NULL) {
1522 		nfs4_copy_stateid(&stateid, ctx->state, l_ctx->lockowner, l_ctx->pid);
1523 		if (zero_seqid)
1524 			stateid.stateid.seqid = 0;
1525 		xdr_encode_opaque_fixed(p, stateid.data, NFS4_STATEID_SIZE);
1526 	} else
1527 		xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1528 }
1529 
1530 static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
1531 {
1532 	__be32 *p;
1533 
1534 	p = reserve_space(xdr, 4);
1535 	*p = cpu_to_be32(OP_READ);
1536 
1537 	encode_stateid(xdr, args->context, args->lock_context,
1538 		       hdr->minorversion);
1539 
1540 	p = reserve_space(xdr, 12);
1541 	p = xdr_encode_hyper(p, args->offset);
1542 	*p = cpu_to_be32(args->count);
1543 	hdr->nops++;
1544 	hdr->replen += decode_read_maxsz;
1545 }
1546 
1547 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1548 {
1549 	uint32_t attrs[2] = {
1550 		FATTR4_WORD0_RDATTR_ERROR,
1551 		FATTR4_WORD1_MOUNTED_ON_FILEID,
1552 	};
1553 	uint32_t dircount = readdir->count >> 1;
1554 	__be32 *p;
1555 
1556 	if (readdir->plus) {
1557 		attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1558 			FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1559 		attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1560 			FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1561 			FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1562 			FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1563 		dircount >>= 1;
1564 	}
1565 	/* Use mounted_on_fileid only if the server supports it */
1566 	if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1567 		attrs[0] |= FATTR4_WORD0_FILEID;
1568 
1569 	p = reserve_space(xdr, 12+NFS4_VERIFIER_SIZE+20);
1570 	*p++ = cpu_to_be32(OP_READDIR);
1571 	p = xdr_encode_hyper(p, readdir->cookie);
1572 	p = xdr_encode_opaque_fixed(p, readdir->verifier.data, NFS4_VERIFIER_SIZE);
1573 	*p++ = cpu_to_be32(dircount);
1574 	*p++ = cpu_to_be32(readdir->count);
1575 	*p++ = cpu_to_be32(2);
1576 
1577 	*p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
1578 	*p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
1579 	hdr->nops++;
1580 	hdr->replen += decode_readdir_maxsz;
1581 	dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
1582 			__func__,
1583 			(unsigned long long)readdir->cookie,
1584 			((u32 *)readdir->verifier.data)[0],
1585 			((u32 *)readdir->verifier.data)[1],
1586 			attrs[0] & readdir->bitmask[0],
1587 			attrs[1] & readdir->bitmask[1]);
1588 }
1589 
1590 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1591 {
1592 	__be32 *p;
1593 
1594 	p = reserve_space(xdr, 4);
1595 	*p = cpu_to_be32(OP_READLINK);
1596 	hdr->nops++;
1597 	hdr->replen += decode_readlink_maxsz;
1598 }
1599 
1600 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1601 {
1602 	__be32 *p;
1603 
1604 	p = reserve_space(xdr, 8 + name->len);
1605 	*p++ = cpu_to_be32(OP_REMOVE);
1606 	xdr_encode_opaque(p, name->name, name->len);
1607 	hdr->nops++;
1608 	hdr->replen += decode_remove_maxsz;
1609 }
1610 
1611 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1612 {
1613 	__be32 *p;
1614 
1615 	p = reserve_space(xdr, 4);
1616 	*p = cpu_to_be32(OP_RENAME);
1617 	encode_string(xdr, oldname->len, oldname->name);
1618 	encode_string(xdr, newname->len, newname->name);
1619 	hdr->nops++;
1620 	hdr->replen += decode_rename_maxsz;
1621 }
1622 
1623 static void encode_renew(struct xdr_stream *xdr, const struct nfs_client *client_stateid, struct compound_hdr *hdr)
1624 {
1625 	__be32 *p;
1626 
1627 	p = reserve_space(xdr, 12);
1628 	*p++ = cpu_to_be32(OP_RENEW);
1629 	xdr_encode_hyper(p, client_stateid->cl_clientid);
1630 	hdr->nops++;
1631 	hdr->replen += decode_renew_maxsz;
1632 }
1633 
1634 static void
1635 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1636 {
1637 	__be32 *p;
1638 
1639 	p = reserve_space(xdr, 4);
1640 	*p = cpu_to_be32(OP_RESTOREFH);
1641 	hdr->nops++;
1642 	hdr->replen += decode_restorefh_maxsz;
1643 }
1644 
1645 static void
1646 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1647 {
1648 	__be32 *p;
1649 
1650 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1651 	*p++ = cpu_to_be32(OP_SETATTR);
1652 	xdr_encode_opaque_fixed(p, zero_stateid.data, NFS4_STATEID_SIZE);
1653 	p = reserve_space(xdr, 2*4);
1654 	*p++ = cpu_to_be32(1);
1655 	*p = cpu_to_be32(FATTR4_WORD0_ACL);
1656 	BUG_ON(arg->acl_len % 4);
1657 	p = reserve_space(xdr, 4);
1658 	*p = cpu_to_be32(arg->acl_len);
1659 	xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1660 	hdr->nops++;
1661 	hdr->replen += decode_setacl_maxsz;
1662 }
1663 
1664 static void
1665 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1666 {
1667 	__be32 *p;
1668 
1669 	p = reserve_space(xdr, 4);
1670 	*p = cpu_to_be32(OP_SAVEFH);
1671 	hdr->nops++;
1672 	hdr->replen += decode_savefh_maxsz;
1673 }
1674 
1675 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1676 {
1677 	__be32 *p;
1678 
1679 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1680 	*p++ = cpu_to_be32(OP_SETATTR);
1681 	xdr_encode_opaque_fixed(p, arg->stateid.data, NFS4_STATEID_SIZE);
1682 	hdr->nops++;
1683 	hdr->replen += decode_setattr_maxsz;
1684 	encode_attrs(xdr, arg->iap, server);
1685 }
1686 
1687 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1688 {
1689 	__be32 *p;
1690 
1691 	p = reserve_space(xdr, 4 + NFS4_VERIFIER_SIZE);
1692 	*p++ = cpu_to_be32(OP_SETCLIENTID);
1693 	xdr_encode_opaque_fixed(p, setclientid->sc_verifier->data, NFS4_VERIFIER_SIZE);
1694 
1695 	encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1696 	p = reserve_space(xdr, 4);
1697 	*p = cpu_to_be32(setclientid->sc_prog);
1698 	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1699 	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1700 	p = reserve_space(xdr, 4);
1701 	*p = cpu_to_be32(setclientid->sc_cb_ident);
1702 	hdr->nops++;
1703 	hdr->replen += decode_setclientid_maxsz;
1704 }
1705 
1706 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1707 {
1708 	__be32 *p;
1709 
1710 	p = reserve_space(xdr, 12 + NFS4_VERIFIER_SIZE);
1711 	*p++ = cpu_to_be32(OP_SETCLIENTID_CONFIRM);
1712 	p = xdr_encode_hyper(p, arg->clientid);
1713 	xdr_encode_opaque_fixed(p, arg->confirm.data, NFS4_VERIFIER_SIZE);
1714 	hdr->nops++;
1715 	hdr->replen += decode_setclientid_confirm_maxsz;
1716 }
1717 
1718 static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1719 {
1720 	__be32 *p;
1721 
1722 	p = reserve_space(xdr, 4);
1723 	*p = cpu_to_be32(OP_WRITE);
1724 
1725 	encode_stateid(xdr, args->context, args->lock_context,
1726 		       hdr->minorversion);
1727 
1728 	p = reserve_space(xdr, 16);
1729 	p = xdr_encode_hyper(p, args->offset);
1730 	*p++ = cpu_to_be32(args->stable);
1731 	*p = cpu_to_be32(args->count);
1732 
1733 	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1734 	hdr->nops++;
1735 	hdr->replen += decode_write_maxsz;
1736 }
1737 
1738 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1739 {
1740 	__be32 *p;
1741 
1742 	p = reserve_space(xdr, 4+NFS4_STATEID_SIZE);
1743 
1744 	*p++ = cpu_to_be32(OP_DELEGRETURN);
1745 	xdr_encode_opaque_fixed(p, stateid->data, NFS4_STATEID_SIZE);
1746 	hdr->nops++;
1747 	hdr->replen += decode_delegreturn_maxsz;
1748 }
1749 
1750 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1751 {
1752 	int len = name->len;
1753 	__be32 *p;
1754 
1755 	p = reserve_space(xdr, 8 + len);
1756 	*p++ = cpu_to_be32(OP_SECINFO);
1757 	xdr_encode_opaque(p, name->name, len);
1758 	hdr->nops++;
1759 	hdr->replen += decode_secinfo_maxsz;
1760 }
1761 
1762 #if defined(CONFIG_NFS_V4_1)
1763 /* NFSv4.1 operations */
1764 static void encode_exchange_id(struct xdr_stream *xdr,
1765 			       struct nfs41_exchange_id_args *args,
1766 			       struct compound_hdr *hdr)
1767 {
1768 	__be32 *p;
1769 
1770 	p = reserve_space(xdr, 4 + sizeof(args->verifier->data));
1771 	*p++ = cpu_to_be32(OP_EXCHANGE_ID);
1772 	xdr_encode_opaque_fixed(p, args->verifier->data, sizeof(args->verifier->data));
1773 
1774 	encode_string(xdr, args->id_len, args->id);
1775 
1776 	p = reserve_space(xdr, 12);
1777 	*p++ = cpu_to_be32(args->flags);
1778 	*p++ = cpu_to_be32(0);	/* zero length state_protect4_a */
1779 	*p = cpu_to_be32(0);	/* zero length implementation id array */
1780 	hdr->nops++;
1781 	hdr->replen += decode_exchange_id_maxsz;
1782 }
1783 
1784 static void encode_create_session(struct xdr_stream *xdr,
1785 				  struct nfs41_create_session_args *args,
1786 				  struct compound_hdr *hdr)
1787 {
1788 	__be32 *p;
1789 	char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
1790 	uint32_t len;
1791 	struct nfs_client *clp = args->client;
1792 	u32 max_resp_sz_cached;
1793 
1794 	/*
1795 	 * Assumes OPEN is the biggest non-idempotent compound.
1796 	 * 2 is the verifier.
1797 	 */
1798 	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1799 			      RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1800 
1801 	len = scnprintf(machine_name, sizeof(machine_name), "%s",
1802 			clp->cl_ipaddr);
1803 
1804 	p = reserve_space(xdr, 20 + 2*28 + 20 + len + 12);
1805 	*p++ = cpu_to_be32(OP_CREATE_SESSION);
1806 	p = xdr_encode_hyper(p, clp->cl_clientid);
1807 	*p++ = cpu_to_be32(clp->cl_seqid);			/*Sequence id */
1808 	*p++ = cpu_to_be32(args->flags);			/*flags */
1809 
1810 	/* Fore Channel */
1811 	*p++ = cpu_to_be32(0);				/* header padding size */
1812 	*p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz);	/* max req size */
1813 	*p++ = cpu_to_be32(args->fc_attrs.max_resp_sz);	/* max resp size */
1814 	*p++ = cpu_to_be32(max_resp_sz_cached);		/* Max resp sz cached */
1815 	*p++ = cpu_to_be32(args->fc_attrs.max_ops);	/* max operations */
1816 	*p++ = cpu_to_be32(args->fc_attrs.max_reqs);	/* max requests */
1817 	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1818 
1819 	/* Back Channel */
1820 	*p++ = cpu_to_be32(0);				/* header padding size */
1821 	*p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz);	/* max req size */
1822 	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz);	/* max resp size */
1823 	*p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);	/* Max resp sz cached */
1824 	*p++ = cpu_to_be32(args->bc_attrs.max_ops);	/* max operations */
1825 	*p++ = cpu_to_be32(args->bc_attrs.max_reqs);	/* max requests */
1826 	*p++ = cpu_to_be32(0);				/* rdmachannel_attrs */
1827 
1828 	*p++ = cpu_to_be32(args->cb_program);		/* cb_program */
1829 	*p++ = cpu_to_be32(1);
1830 	*p++ = cpu_to_be32(RPC_AUTH_UNIX);			/* auth_sys */
1831 
1832 	/* authsys_parms rfc1831 */
1833 	*p++ = cpu_to_be32((u32)clp->cl_boot_time.tv_nsec);	/* stamp */
1834 	p = xdr_encode_opaque(p, machine_name, len);
1835 	*p++ = cpu_to_be32(0);				/* UID */
1836 	*p++ = cpu_to_be32(0);				/* GID */
1837 	*p = cpu_to_be32(0);				/* No more gids */
1838 	hdr->nops++;
1839 	hdr->replen += decode_create_session_maxsz;
1840 }
1841 
1842 static void encode_destroy_session(struct xdr_stream *xdr,
1843 				   struct nfs4_session *session,
1844 				   struct compound_hdr *hdr)
1845 {
1846 	__be32 *p;
1847 	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN);
1848 	*p++ = cpu_to_be32(OP_DESTROY_SESSION);
1849 	xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1850 	hdr->nops++;
1851 	hdr->replen += decode_destroy_session_maxsz;
1852 }
1853 
1854 static void encode_reclaim_complete(struct xdr_stream *xdr,
1855 				    struct nfs41_reclaim_complete_args *args,
1856 				    struct compound_hdr *hdr)
1857 {
1858 	__be32 *p;
1859 
1860 	p = reserve_space(xdr, 8);
1861 	*p++ = cpu_to_be32(OP_RECLAIM_COMPLETE);
1862 	*p++ = cpu_to_be32(args->one_fs);
1863 	hdr->nops++;
1864 	hdr->replen += decode_reclaim_complete_maxsz;
1865 }
1866 #endif /* CONFIG_NFS_V4_1 */
1867 
1868 static void encode_sequence(struct xdr_stream *xdr,
1869 			    const struct nfs4_sequence_args *args,
1870 			    struct compound_hdr *hdr)
1871 {
1872 #if defined(CONFIG_NFS_V4_1)
1873 	struct nfs4_session *session = args->sa_session;
1874 	struct nfs4_slot_table *tp;
1875 	struct nfs4_slot *slot;
1876 	__be32 *p;
1877 
1878 	if (!session)
1879 		return;
1880 
1881 	tp = &session->fc_slot_table;
1882 
1883 	WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
1884 	slot = tp->slots + args->sa_slotid;
1885 
1886 	p = reserve_space(xdr, 4 + NFS4_MAX_SESSIONID_LEN + 16);
1887 	*p++ = cpu_to_be32(OP_SEQUENCE);
1888 
1889 	/*
1890 	 * Sessionid + seqid + slotid + max slotid + cache_this
1891 	 */
1892 	dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1893 		"max_slotid=%d cache_this=%d\n",
1894 		__func__,
1895 		((u32 *)session->sess_id.data)[0],
1896 		((u32 *)session->sess_id.data)[1],
1897 		((u32 *)session->sess_id.data)[2],
1898 		((u32 *)session->sess_id.data)[3],
1899 		slot->seq_nr, args->sa_slotid,
1900 		tp->highest_used_slotid, args->sa_cache_this);
1901 	p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1902 	*p++ = cpu_to_be32(slot->seq_nr);
1903 	*p++ = cpu_to_be32(args->sa_slotid);
1904 	*p++ = cpu_to_be32(tp->highest_used_slotid);
1905 	*p = cpu_to_be32(args->sa_cache_this);
1906 	hdr->nops++;
1907 	hdr->replen += decode_sequence_maxsz;
1908 #endif /* CONFIG_NFS_V4_1 */
1909 }
1910 
1911 #ifdef CONFIG_NFS_V4_1
1912 static void
1913 encode_getdevicelist(struct xdr_stream *xdr,
1914 		     const struct nfs4_getdevicelist_args *args,
1915 		     struct compound_hdr *hdr)
1916 {
1917 	__be32 *p;
1918 	nfs4_verifier dummy = {
1919 		.data = "dummmmmy",
1920 	};
1921 
1922 	p = reserve_space(xdr, 20);
1923 	*p++ = cpu_to_be32(OP_GETDEVICELIST);
1924 	*p++ = cpu_to_be32(args->layoutclass);
1925 	*p++ = cpu_to_be32(NFS4_PNFS_GETDEVLIST_MAXNUM);
1926 	xdr_encode_hyper(p, 0ULL);                          /* cookie */
1927 	encode_nfs4_verifier(xdr, &dummy);
1928 	hdr->nops++;
1929 	hdr->replen += decode_getdevicelist_maxsz;
1930 }
1931 
1932 static void
1933 encode_getdeviceinfo(struct xdr_stream *xdr,
1934 		     const struct nfs4_getdeviceinfo_args *args,
1935 		     struct compound_hdr *hdr)
1936 {
1937 	__be32 *p;
1938 
1939 	p = reserve_space(xdr, 16 + NFS4_DEVICEID4_SIZE);
1940 	*p++ = cpu_to_be32(OP_GETDEVICEINFO);
1941 	p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1942 				    NFS4_DEVICEID4_SIZE);
1943 	*p++ = cpu_to_be32(args->pdev->layout_type);
1944 	*p++ = cpu_to_be32(args->pdev->pglen);		/* gdia_maxcount */
1945 	*p++ = cpu_to_be32(0);				/* bitmap length 0 */
1946 	hdr->nops++;
1947 	hdr->replen += decode_getdeviceinfo_maxsz;
1948 }
1949 
1950 static void
1951 encode_layoutget(struct xdr_stream *xdr,
1952 		      const struct nfs4_layoutget_args *args,
1953 		      struct compound_hdr *hdr)
1954 {
1955 	__be32 *p;
1956 
1957 	p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
1958 	*p++ = cpu_to_be32(OP_LAYOUTGET);
1959 	*p++ = cpu_to_be32(0);     /* Signal layout available */
1960 	*p++ = cpu_to_be32(args->type);
1961 	*p++ = cpu_to_be32(args->range.iomode);
1962 	p = xdr_encode_hyper(p, args->range.offset);
1963 	p = xdr_encode_hyper(p, args->range.length);
1964 	p = xdr_encode_hyper(p, args->minlength);
1965 	p = xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
1966 	*p = cpu_to_be32(args->maxcount);
1967 
1968 	dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1969 		__func__,
1970 		args->type,
1971 		args->range.iomode,
1972 		(unsigned long)args->range.offset,
1973 		(unsigned long)args->range.length,
1974 		args->maxcount);
1975 	hdr->nops++;
1976 	hdr->replen += decode_layoutget_maxsz;
1977 }
1978 
1979 static int
1980 encode_layoutcommit(struct xdr_stream *xdr,
1981 		    struct inode *inode,
1982 		    const struct nfs4_layoutcommit_args *args,
1983 		    struct compound_hdr *hdr)
1984 {
1985 	__be32 *p;
1986 
1987 	dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
1988 		NFS_SERVER(args->inode)->pnfs_curr_ld->id);
1989 
1990 	p = reserve_space(xdr, 44 + NFS4_STATEID_SIZE);
1991 	*p++ = cpu_to_be32(OP_LAYOUTCOMMIT);
1992 	/* Only whole file layouts */
1993 	p = xdr_encode_hyper(p, 0); /* offset */
1994 	p = xdr_encode_hyper(p, args->lastbytewritten + 1);	/* length */
1995 	*p++ = cpu_to_be32(0); /* reclaim */
1996 	p = xdr_encode_opaque_fixed(p, args->stateid.data, NFS4_STATEID_SIZE);
1997 	*p++ = cpu_to_be32(1); /* newoffset = TRUE */
1998 	p = xdr_encode_hyper(p, args->lastbytewritten);
1999 	*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2000 	*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2001 
2002 	if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
2003 		NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
2004 			NFS_I(inode)->layout, xdr, args);
2005 	else {
2006 		p = reserve_space(xdr, 4);
2007 		*p = cpu_to_be32(0); /* no layout-type payload */
2008 	}
2009 
2010 	hdr->nops++;
2011 	hdr->replen += decode_layoutcommit_maxsz;
2012 	return 0;
2013 }
2014 
2015 static void
2016 encode_layoutreturn(struct xdr_stream *xdr,
2017 		    const struct nfs4_layoutreturn_args *args,
2018 		    struct compound_hdr *hdr)
2019 {
2020 	__be32 *p;
2021 
2022 	p = reserve_space(xdr, 20);
2023 	*p++ = cpu_to_be32(OP_LAYOUTRETURN);
2024 	*p++ = cpu_to_be32(0);		/* reclaim. always 0 for now */
2025 	*p++ = cpu_to_be32(args->layout_type);
2026 	*p++ = cpu_to_be32(IOMODE_ANY);
2027 	*p = cpu_to_be32(RETURN_FILE);
2028 	p = reserve_space(xdr, 16 + NFS4_STATEID_SIZE);
2029 	p = xdr_encode_hyper(p, 0);
2030 	p = xdr_encode_hyper(p, NFS4_MAX_UINT64);
2031 	spin_lock(&args->inode->i_lock);
2032 	xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
2033 	spin_unlock(&args->inode->i_lock);
2034 	if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
2035 		NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
2036 			NFS_I(args->inode)->layout, xdr, args);
2037 	} else {
2038 		p = reserve_space(xdr, 4);
2039 		*p = cpu_to_be32(0);
2040 	}
2041 	hdr->nops++;
2042 	hdr->replen += decode_layoutreturn_maxsz;
2043 }
2044 
2045 static int
2046 encode_secinfo_no_name(struct xdr_stream *xdr,
2047 		       const struct nfs41_secinfo_no_name_args *args,
2048 		       struct compound_hdr *hdr)
2049 {
2050 	__be32 *p;
2051 	p = reserve_space(xdr, 8);
2052 	*p++ = cpu_to_be32(OP_SECINFO_NO_NAME);
2053 	*p++ = cpu_to_be32(args->style);
2054 	hdr->nops++;
2055 	hdr->replen += decode_secinfo_no_name_maxsz;
2056 	return 0;
2057 }
2058 
2059 static void encode_test_stateid(struct xdr_stream *xdr,
2060 				struct nfs41_test_stateid_args *args,
2061 				struct compound_hdr *hdr)
2062 {
2063 	__be32 *p;
2064 
2065 	p = reserve_space(xdr, 8 + NFS4_STATEID_SIZE);
2066 	*p++ = cpu_to_be32(OP_TEST_STATEID);
2067 	*p++ = cpu_to_be32(1);
2068 	xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
2069 	hdr->nops++;
2070 	hdr->replen += decode_test_stateid_maxsz;
2071 }
2072 
2073 static void encode_free_stateid(struct xdr_stream *xdr,
2074 				struct nfs41_free_stateid_args *args,
2075 				struct compound_hdr *hdr)
2076 {
2077 	__be32 *p;
2078 	p = reserve_space(xdr, 4 + NFS4_STATEID_SIZE);
2079 	*p++ = cpu_to_be32(OP_FREE_STATEID);
2080 	xdr_encode_opaque_fixed(p, args->stateid->data, NFS4_STATEID_SIZE);
2081 	hdr->nops++;
2082 	hdr->replen += decode_free_stateid_maxsz;
2083 }
2084 #endif /* CONFIG_NFS_V4_1 */
2085 
2086 /*
2087  * END OF "GENERIC" ENCODE ROUTINES.
2088  */
2089 
2090 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2091 {
2092 #if defined(CONFIG_NFS_V4_1)
2093 	if (args->sa_session)
2094 		return args->sa_session->clp->cl_mvops->minor_version;
2095 #endif /* CONFIG_NFS_V4_1 */
2096 	return 0;
2097 }
2098 
2099 /*
2100  * Encode an ACCESS request
2101  */
2102 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2103 				const struct nfs4_accessargs *args)
2104 {
2105 	struct compound_hdr hdr = {
2106 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2107 	};
2108 
2109 	encode_compound_hdr(xdr, req, &hdr);
2110 	encode_sequence(xdr, &args->seq_args, &hdr);
2111 	encode_putfh(xdr, args->fh, &hdr);
2112 	encode_access(xdr, args->access, &hdr);
2113 	encode_getfattr(xdr, args->bitmask, &hdr);
2114 	encode_nops(&hdr);
2115 }
2116 
2117 /*
2118  * Encode LOOKUP request
2119  */
2120 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2121 				const struct nfs4_lookup_arg *args)
2122 {
2123 	struct compound_hdr hdr = {
2124 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2125 	};
2126 
2127 	encode_compound_hdr(xdr, req, &hdr);
2128 	encode_sequence(xdr, &args->seq_args, &hdr);
2129 	encode_putfh(xdr, args->dir_fh, &hdr);
2130 	encode_lookup(xdr, args->name, &hdr);
2131 	encode_getfh(xdr, &hdr);
2132 	encode_getfattr(xdr, args->bitmask, &hdr);
2133 	encode_nops(&hdr);
2134 }
2135 
2136 /*
2137  * Encode LOOKUP_ROOT request
2138  */
2139 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2140 				     struct xdr_stream *xdr,
2141 				     const struct nfs4_lookup_root_arg *args)
2142 {
2143 	struct compound_hdr hdr = {
2144 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2145 	};
2146 
2147 	encode_compound_hdr(xdr, req, &hdr);
2148 	encode_sequence(xdr, &args->seq_args, &hdr);
2149 	encode_putrootfh(xdr, &hdr);
2150 	encode_getfh(xdr, &hdr);
2151 	encode_getfattr(xdr, args->bitmask, &hdr);
2152 	encode_nops(&hdr);
2153 }
2154 
2155 /*
2156  * Encode REMOVE request
2157  */
2158 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2159 				const struct nfs_removeargs *args)
2160 {
2161 	struct compound_hdr hdr = {
2162 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2163 	};
2164 
2165 	encode_compound_hdr(xdr, req, &hdr);
2166 	encode_sequence(xdr, &args->seq_args, &hdr);
2167 	encode_putfh(xdr, args->fh, &hdr);
2168 	encode_remove(xdr, &args->name, &hdr);
2169 	encode_getfattr(xdr, args->bitmask, &hdr);
2170 	encode_nops(&hdr);
2171 }
2172 
2173 /*
2174  * Encode RENAME request
2175  */
2176 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2177 				const struct nfs_renameargs *args)
2178 {
2179 	struct compound_hdr hdr = {
2180 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2181 	};
2182 
2183 	encode_compound_hdr(xdr, req, &hdr);
2184 	encode_sequence(xdr, &args->seq_args, &hdr);
2185 	encode_putfh(xdr, args->old_dir, &hdr);
2186 	encode_savefh(xdr, &hdr);
2187 	encode_putfh(xdr, args->new_dir, &hdr);
2188 	encode_rename(xdr, args->old_name, args->new_name, &hdr);
2189 	encode_getfattr(xdr, args->bitmask, &hdr);
2190 	encode_restorefh(xdr, &hdr);
2191 	encode_getfattr(xdr, args->bitmask, &hdr);
2192 	encode_nops(&hdr);
2193 }
2194 
2195 /*
2196  * Encode LINK request
2197  */
2198 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2199 			     const struct nfs4_link_arg *args)
2200 {
2201 	struct compound_hdr hdr = {
2202 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2203 	};
2204 
2205 	encode_compound_hdr(xdr, req, &hdr);
2206 	encode_sequence(xdr, &args->seq_args, &hdr);
2207 	encode_putfh(xdr, args->fh, &hdr);
2208 	encode_savefh(xdr, &hdr);
2209 	encode_putfh(xdr, args->dir_fh, &hdr);
2210 	encode_link(xdr, args->name, &hdr);
2211 	encode_getfattr(xdr, args->bitmask, &hdr);
2212 	encode_restorefh(xdr, &hdr);
2213 	encode_getfattr(xdr, args->bitmask, &hdr);
2214 	encode_nops(&hdr);
2215 }
2216 
2217 /*
2218  * Encode CREATE request
2219  */
2220 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2221 				const struct nfs4_create_arg *args)
2222 {
2223 	struct compound_hdr hdr = {
2224 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2225 	};
2226 
2227 	encode_compound_hdr(xdr, req, &hdr);
2228 	encode_sequence(xdr, &args->seq_args, &hdr);
2229 	encode_putfh(xdr, args->dir_fh, &hdr);
2230 	encode_savefh(xdr, &hdr);
2231 	encode_create(xdr, args, &hdr);
2232 	encode_getfh(xdr, &hdr);
2233 	encode_getfattr(xdr, args->bitmask, &hdr);
2234 	encode_restorefh(xdr, &hdr);
2235 	encode_getfattr(xdr, args->bitmask, &hdr);
2236 	encode_nops(&hdr);
2237 }
2238 
2239 /*
2240  * Encode SYMLINK request
2241  */
2242 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2243 				 const struct nfs4_create_arg *args)
2244 {
2245 	nfs4_xdr_enc_create(req, xdr, args);
2246 }
2247 
2248 /*
2249  * Encode GETATTR request
2250  */
2251 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2252 				 const struct nfs4_getattr_arg *args)
2253 {
2254 	struct compound_hdr hdr = {
2255 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2256 	};
2257 
2258 	encode_compound_hdr(xdr, req, &hdr);
2259 	encode_sequence(xdr, &args->seq_args, &hdr);
2260 	encode_putfh(xdr, args->fh, &hdr);
2261 	encode_getfattr(xdr, args->bitmask, &hdr);
2262 	encode_nops(&hdr);
2263 }
2264 
2265 /*
2266  * Encode a CLOSE request
2267  */
2268 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2269 			       struct nfs_closeargs *args)
2270 {
2271 	struct compound_hdr hdr = {
2272 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2273 	};
2274 
2275 	encode_compound_hdr(xdr, req, &hdr);
2276 	encode_sequence(xdr, &args->seq_args, &hdr);
2277 	encode_putfh(xdr, args->fh, &hdr);
2278 	encode_close(xdr, args, &hdr);
2279 	encode_getfattr(xdr, args->bitmask, &hdr);
2280 	encode_nops(&hdr);
2281 }
2282 
2283 /*
2284  * Encode an OPEN request
2285  */
2286 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2287 			      struct nfs_openargs *args)
2288 {
2289 	struct compound_hdr hdr = {
2290 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2291 	};
2292 
2293 	encode_compound_hdr(xdr, req, &hdr);
2294 	encode_sequence(xdr, &args->seq_args, &hdr);
2295 	encode_putfh(xdr, args->fh, &hdr);
2296 	encode_savefh(xdr, &hdr);
2297 	encode_open(xdr, args, &hdr);
2298 	encode_getfh(xdr, &hdr);
2299 	encode_getfattr(xdr, args->bitmask, &hdr);
2300 	encode_restorefh(xdr, &hdr);
2301 	encode_getfattr(xdr, args->bitmask, &hdr);
2302 	encode_nops(&hdr);
2303 }
2304 
2305 /*
2306  * Encode an OPEN_CONFIRM request
2307  */
2308 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2309 				      struct xdr_stream *xdr,
2310 				      struct nfs_open_confirmargs *args)
2311 {
2312 	struct compound_hdr hdr = {
2313 		.nops   = 0,
2314 	};
2315 
2316 	encode_compound_hdr(xdr, req, &hdr);
2317 	encode_putfh(xdr, args->fh, &hdr);
2318 	encode_open_confirm(xdr, args, &hdr);
2319 	encode_nops(&hdr);
2320 }
2321 
2322 /*
2323  * Encode an OPEN request with no attributes.
2324  */
2325 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2326 				     struct xdr_stream *xdr,
2327 				     struct nfs_openargs *args)
2328 {
2329 	struct compound_hdr hdr = {
2330 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2331 	};
2332 
2333 	encode_compound_hdr(xdr, req, &hdr);
2334 	encode_sequence(xdr, &args->seq_args, &hdr);
2335 	encode_putfh(xdr, args->fh, &hdr);
2336 	encode_open(xdr, args, &hdr);
2337 	encode_getfattr(xdr, args->bitmask, &hdr);
2338 	encode_nops(&hdr);
2339 }
2340 
2341 /*
2342  * Encode an OPEN_DOWNGRADE request
2343  */
2344 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2345 					struct xdr_stream *xdr,
2346 					struct nfs_closeargs *args)
2347 {
2348 	struct compound_hdr hdr = {
2349 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2350 	};
2351 
2352 	encode_compound_hdr(xdr, req, &hdr);
2353 	encode_sequence(xdr, &args->seq_args, &hdr);
2354 	encode_putfh(xdr, args->fh, &hdr);
2355 	encode_open_downgrade(xdr, args, &hdr);
2356 	encode_getfattr(xdr, args->bitmask, &hdr);
2357 	encode_nops(&hdr);
2358 }
2359 
2360 /*
2361  * Encode a LOCK request
2362  */
2363 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2364 			      struct nfs_lock_args *args)
2365 {
2366 	struct compound_hdr hdr = {
2367 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2368 	};
2369 
2370 	encode_compound_hdr(xdr, req, &hdr);
2371 	encode_sequence(xdr, &args->seq_args, &hdr);
2372 	encode_putfh(xdr, args->fh, &hdr);
2373 	encode_lock(xdr, args, &hdr);
2374 	encode_nops(&hdr);
2375 }
2376 
2377 /*
2378  * Encode a LOCKT request
2379  */
2380 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2381 			       struct nfs_lockt_args *args)
2382 {
2383 	struct compound_hdr hdr = {
2384 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2385 	};
2386 
2387 	encode_compound_hdr(xdr, req, &hdr);
2388 	encode_sequence(xdr, &args->seq_args, &hdr);
2389 	encode_putfh(xdr, args->fh, &hdr);
2390 	encode_lockt(xdr, args, &hdr);
2391 	encode_nops(&hdr);
2392 }
2393 
2394 /*
2395  * Encode a LOCKU request
2396  */
2397 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2398 			       struct nfs_locku_args *args)
2399 {
2400 	struct compound_hdr hdr = {
2401 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2402 	};
2403 
2404 	encode_compound_hdr(xdr, req, &hdr);
2405 	encode_sequence(xdr, &args->seq_args, &hdr);
2406 	encode_putfh(xdr, args->fh, &hdr);
2407 	encode_locku(xdr, args, &hdr);
2408 	encode_nops(&hdr);
2409 }
2410 
2411 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2412 					   struct xdr_stream *xdr,
2413 					struct nfs_release_lockowner_args *args)
2414 {
2415 	struct compound_hdr hdr = {
2416 		.minorversion = 0,
2417 	};
2418 
2419 	encode_compound_hdr(xdr, req, &hdr);
2420 	encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2421 	encode_nops(&hdr);
2422 }
2423 
2424 /*
2425  * Encode a READLINK request
2426  */
2427 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2428 				  const struct nfs4_readlink *args)
2429 {
2430 	struct compound_hdr hdr = {
2431 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2432 	};
2433 
2434 	encode_compound_hdr(xdr, req, &hdr);
2435 	encode_sequence(xdr, &args->seq_args, &hdr);
2436 	encode_putfh(xdr, args->fh, &hdr);
2437 	encode_readlink(xdr, args, req, &hdr);
2438 
2439 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2440 			args->pgbase, args->pglen);
2441 	encode_nops(&hdr);
2442 }
2443 
2444 /*
2445  * Encode a READDIR request
2446  */
2447 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2448 				 const struct nfs4_readdir_arg *args)
2449 {
2450 	struct compound_hdr hdr = {
2451 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2452 	};
2453 
2454 	encode_compound_hdr(xdr, req, &hdr);
2455 	encode_sequence(xdr, &args->seq_args, &hdr);
2456 	encode_putfh(xdr, args->fh, &hdr);
2457 	encode_readdir(xdr, args, req, &hdr);
2458 
2459 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2460 			 args->pgbase, args->count);
2461 	dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2462 			__func__, hdr.replen << 2, args->pages,
2463 			args->pgbase, args->count);
2464 	encode_nops(&hdr);
2465 }
2466 
2467 /*
2468  * Encode a READ request
2469  */
2470 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2471 			      struct nfs_readargs *args)
2472 {
2473 	struct compound_hdr hdr = {
2474 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2475 	};
2476 
2477 	encode_compound_hdr(xdr, req, &hdr);
2478 	encode_sequence(xdr, &args->seq_args, &hdr);
2479 	encode_putfh(xdr, args->fh, &hdr);
2480 	encode_read(xdr, args, &hdr);
2481 
2482 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2483 			 args->pages, args->pgbase, args->count);
2484 	req->rq_rcv_buf.flags |= XDRBUF_READ;
2485 	encode_nops(&hdr);
2486 }
2487 
2488 /*
2489  * Encode an SETATTR request
2490  */
2491 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2492 				 struct nfs_setattrargs *args)
2493 {
2494 	struct compound_hdr hdr = {
2495 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2496 	};
2497 
2498 	encode_compound_hdr(xdr, req, &hdr);
2499 	encode_sequence(xdr, &args->seq_args, &hdr);
2500 	encode_putfh(xdr, args->fh, &hdr);
2501 	encode_setattr(xdr, args, args->server, &hdr);
2502 	encode_getfattr(xdr, args->bitmask, &hdr);
2503 	encode_nops(&hdr);
2504 }
2505 
2506 /*
2507  * Encode a GETACL request
2508  */
2509 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2510 				struct nfs_getaclargs *args)
2511 {
2512 	struct compound_hdr hdr = {
2513 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2514 	};
2515 	uint32_t replen;
2516 
2517 	encode_compound_hdr(xdr, req, &hdr);
2518 	encode_sequence(xdr, &args->seq_args, &hdr);
2519 	encode_putfh(xdr, args->fh, &hdr);
2520 	replen = hdr.replen + op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz + 1;
2521 	encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
2522 
2523 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2524 		args->acl_pages, args->acl_pgbase, args->acl_len);
2525 	encode_nops(&hdr);
2526 }
2527 
2528 /*
2529  * Encode a WRITE request
2530  */
2531 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2532 			       struct nfs_writeargs *args)
2533 {
2534 	struct compound_hdr hdr = {
2535 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2536 	};
2537 
2538 	encode_compound_hdr(xdr, req, &hdr);
2539 	encode_sequence(xdr, &args->seq_args, &hdr);
2540 	encode_putfh(xdr, args->fh, &hdr);
2541 	encode_write(xdr, args, &hdr);
2542 	req->rq_snd_buf.flags |= XDRBUF_WRITE;
2543 	if (args->bitmask)
2544 		encode_getfattr(xdr, args->bitmask, &hdr);
2545 	encode_nops(&hdr);
2546 }
2547 
2548 /*
2549  *  a COMMIT request
2550  */
2551 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2552 				struct nfs_writeargs *args)
2553 {
2554 	struct compound_hdr hdr = {
2555 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2556 	};
2557 
2558 	encode_compound_hdr(xdr, req, &hdr);
2559 	encode_sequence(xdr, &args->seq_args, &hdr);
2560 	encode_putfh(xdr, args->fh, &hdr);
2561 	encode_commit(xdr, args, &hdr);
2562 	if (args->bitmask)
2563 		encode_getfattr(xdr, args->bitmask, &hdr);
2564 	encode_nops(&hdr);
2565 }
2566 
2567 /*
2568  * FSINFO request
2569  */
2570 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2571 				struct nfs4_fsinfo_arg *args)
2572 {
2573 	struct compound_hdr hdr = {
2574 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2575 	};
2576 
2577 	encode_compound_hdr(xdr, req, &hdr);
2578 	encode_sequence(xdr, &args->seq_args, &hdr);
2579 	encode_putfh(xdr, args->fh, &hdr);
2580 	encode_fsinfo(xdr, args->bitmask, &hdr);
2581 	encode_nops(&hdr);
2582 }
2583 
2584 /*
2585  * a PATHCONF request
2586  */
2587 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2588 				  const struct nfs4_pathconf_arg *args)
2589 {
2590 	struct compound_hdr hdr = {
2591 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2592 	};
2593 
2594 	encode_compound_hdr(xdr, req, &hdr);
2595 	encode_sequence(xdr, &args->seq_args, &hdr);
2596 	encode_putfh(xdr, args->fh, &hdr);
2597 	encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2598 			   &hdr);
2599 	encode_nops(&hdr);
2600 }
2601 
2602 /*
2603  * a STATFS request
2604  */
2605 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2606 				const struct nfs4_statfs_arg *args)
2607 {
2608 	struct compound_hdr hdr = {
2609 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2610 	};
2611 
2612 	encode_compound_hdr(xdr, req, &hdr);
2613 	encode_sequence(xdr, &args->seq_args, &hdr);
2614 	encode_putfh(xdr, args->fh, &hdr);
2615 	encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2616 			   args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2617 	encode_nops(&hdr);
2618 }
2619 
2620 /*
2621  * GETATTR_BITMAP request
2622  */
2623 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2624 				     struct xdr_stream *xdr,
2625 				     struct nfs4_server_caps_arg *args)
2626 {
2627 	struct compound_hdr hdr = {
2628 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2629 	};
2630 
2631 	encode_compound_hdr(xdr, req, &hdr);
2632 	encode_sequence(xdr, &args->seq_args, &hdr);
2633 	encode_putfh(xdr, args->fhandle, &hdr);
2634 	encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2635 			   FATTR4_WORD0_LINK_SUPPORT|
2636 			   FATTR4_WORD0_SYMLINK_SUPPORT|
2637 			   FATTR4_WORD0_ACLSUPPORT, &hdr);
2638 	encode_nops(&hdr);
2639 }
2640 
2641 /*
2642  * a RENEW request
2643  */
2644 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2645 			       struct nfs_client *clp)
2646 {
2647 	struct compound_hdr hdr = {
2648 		.nops	= 0,
2649 	};
2650 
2651 	encode_compound_hdr(xdr, req, &hdr);
2652 	encode_renew(xdr, clp, &hdr);
2653 	encode_nops(&hdr);
2654 }
2655 
2656 /*
2657  * a SETCLIENTID request
2658  */
2659 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2660 				     struct xdr_stream *xdr,
2661 				     struct nfs4_setclientid *sc)
2662 {
2663 	struct compound_hdr hdr = {
2664 		.nops	= 0,
2665 	};
2666 
2667 	encode_compound_hdr(xdr, req, &hdr);
2668 	encode_setclientid(xdr, sc, &hdr);
2669 	encode_nops(&hdr);
2670 }
2671 
2672 /*
2673  * a SETCLIENTID_CONFIRM request
2674  */
2675 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2676 					     struct xdr_stream *xdr,
2677 					     struct nfs4_setclientid_res *arg)
2678 {
2679 	struct compound_hdr hdr = {
2680 		.nops	= 0,
2681 	};
2682 	const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2683 
2684 	encode_compound_hdr(xdr, req, &hdr);
2685 	encode_setclientid_confirm(xdr, arg, &hdr);
2686 	encode_putrootfh(xdr, &hdr);
2687 	encode_fsinfo(xdr, lease_bitmap, &hdr);
2688 	encode_nops(&hdr);
2689 }
2690 
2691 /*
2692  * DELEGRETURN request
2693  */
2694 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2695 				     struct xdr_stream *xdr,
2696 				     const struct nfs4_delegreturnargs *args)
2697 {
2698 	struct compound_hdr hdr = {
2699 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2700 	};
2701 
2702 	encode_compound_hdr(xdr, req, &hdr);
2703 	encode_sequence(xdr, &args->seq_args, &hdr);
2704 	encode_putfh(xdr, args->fhandle, &hdr);
2705 	encode_delegreturn(xdr, args->stateid, &hdr);
2706 	encode_getfattr(xdr, args->bitmask, &hdr);
2707 	encode_nops(&hdr);
2708 }
2709 
2710 /*
2711  * Encode FS_LOCATIONS request
2712  */
2713 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2714 				      struct xdr_stream *xdr,
2715 				      struct nfs4_fs_locations_arg *args)
2716 {
2717 	struct compound_hdr hdr = {
2718 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2719 	};
2720 	uint32_t replen;
2721 
2722 	encode_compound_hdr(xdr, req, &hdr);
2723 	encode_sequence(xdr, &args->seq_args, &hdr);
2724 	encode_putfh(xdr, args->dir_fh, &hdr);
2725 	encode_lookup(xdr, args->name, &hdr);
2726 	replen = hdr.replen;	/* get the attribute into args->page */
2727 	encode_fs_locations(xdr, args->bitmask, &hdr);
2728 
2729 	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2730 			0, PAGE_SIZE);
2731 	encode_nops(&hdr);
2732 }
2733 
2734 /*
2735  * Encode SECINFO request
2736  */
2737 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2738 				struct xdr_stream *xdr,
2739 				struct nfs4_secinfo_arg *args)
2740 {
2741 	struct compound_hdr hdr = {
2742 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2743 	};
2744 
2745 	encode_compound_hdr(xdr, req, &hdr);
2746 	encode_sequence(xdr, &args->seq_args, &hdr);
2747 	encode_putfh(xdr, args->dir_fh, &hdr);
2748 	encode_secinfo(xdr, args->name, &hdr);
2749 	encode_nops(&hdr);
2750 }
2751 
2752 #if defined(CONFIG_NFS_V4_1)
2753 /*
2754  * EXCHANGE_ID request
2755  */
2756 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2757 				     struct xdr_stream *xdr,
2758 				     struct nfs41_exchange_id_args *args)
2759 {
2760 	struct compound_hdr hdr = {
2761 		.minorversion = args->client->cl_mvops->minor_version,
2762 	};
2763 
2764 	encode_compound_hdr(xdr, req, &hdr);
2765 	encode_exchange_id(xdr, args, &hdr);
2766 	encode_nops(&hdr);
2767 }
2768 
2769 /*
2770  * a CREATE_SESSION request
2771  */
2772 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2773 					struct xdr_stream *xdr,
2774 					struct nfs41_create_session_args *args)
2775 {
2776 	struct compound_hdr hdr = {
2777 		.minorversion = args->client->cl_mvops->minor_version,
2778 	};
2779 
2780 	encode_compound_hdr(xdr, req, &hdr);
2781 	encode_create_session(xdr, args, &hdr);
2782 	encode_nops(&hdr);
2783 }
2784 
2785 /*
2786  * a DESTROY_SESSION request
2787  */
2788 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2789 					 struct xdr_stream *xdr,
2790 					 struct nfs4_session *session)
2791 {
2792 	struct compound_hdr hdr = {
2793 		.minorversion = session->clp->cl_mvops->minor_version,
2794 	};
2795 
2796 	encode_compound_hdr(xdr, req, &hdr);
2797 	encode_destroy_session(xdr, session, &hdr);
2798 	encode_nops(&hdr);
2799 }
2800 
2801 /*
2802  * a SEQUENCE request
2803  */
2804 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2805 				  struct nfs4_sequence_args *args)
2806 {
2807 	struct compound_hdr hdr = {
2808 		.minorversion = nfs4_xdr_minorversion(args),
2809 	};
2810 
2811 	encode_compound_hdr(xdr, req, &hdr);
2812 	encode_sequence(xdr, args, &hdr);
2813 	encode_nops(&hdr);
2814 }
2815 
2816 /*
2817  * a GET_LEASE_TIME request
2818  */
2819 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2820 					struct xdr_stream *xdr,
2821 					struct nfs4_get_lease_time_args *args)
2822 {
2823 	struct compound_hdr hdr = {
2824 		.minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2825 	};
2826 	const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2827 
2828 	encode_compound_hdr(xdr, req, &hdr);
2829 	encode_sequence(xdr, &args->la_seq_args, &hdr);
2830 	encode_putrootfh(xdr, &hdr);
2831 	encode_fsinfo(xdr, lease_bitmap, &hdr);
2832 	encode_nops(&hdr);
2833 }
2834 
2835 /*
2836  * a RECLAIM_COMPLETE request
2837  */
2838 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2839 					  struct xdr_stream *xdr,
2840 				struct nfs41_reclaim_complete_args *args)
2841 {
2842 	struct compound_hdr hdr = {
2843 		.minorversion = nfs4_xdr_minorversion(&args->seq_args)
2844 	};
2845 
2846 	encode_compound_hdr(xdr, req, &hdr);
2847 	encode_sequence(xdr, &args->seq_args, &hdr);
2848 	encode_reclaim_complete(xdr, args, &hdr);
2849 	encode_nops(&hdr);
2850 }
2851 
2852 /*
2853  * Encode GETDEVICELIST request
2854  */
2855 static void nfs4_xdr_enc_getdevicelist(struct rpc_rqst *req,
2856 				       struct xdr_stream *xdr,
2857 				       struct nfs4_getdevicelist_args *args)
2858 {
2859 	struct compound_hdr hdr = {
2860 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2861 	};
2862 
2863 	encode_compound_hdr(xdr, req, &hdr);
2864 	encode_sequence(xdr, &args->seq_args, &hdr);
2865 	encode_putfh(xdr, args->fh, &hdr);
2866 	encode_getdevicelist(xdr, args, &hdr);
2867 	encode_nops(&hdr);
2868 }
2869 
2870 /*
2871  * Encode GETDEVICEINFO request
2872  */
2873 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
2874 				       struct xdr_stream *xdr,
2875 				       struct nfs4_getdeviceinfo_args *args)
2876 {
2877 	struct compound_hdr hdr = {
2878 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2879 	};
2880 
2881 	encode_compound_hdr(xdr, req, &hdr);
2882 	encode_sequence(xdr, &args->seq_args, &hdr);
2883 	encode_getdeviceinfo(xdr, args, &hdr);
2884 
2885 	/* set up reply kvec. Subtract notification bitmap max size (2)
2886 	 * so that notification bitmap is put in xdr_buf tail */
2887 	xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
2888 			 args->pdev->pages, args->pdev->pgbase,
2889 			 args->pdev->pglen);
2890 
2891 	encode_nops(&hdr);
2892 }
2893 
2894 /*
2895  *  Encode LAYOUTGET request
2896  */
2897 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
2898 				   struct xdr_stream *xdr,
2899 				   struct nfs4_layoutget_args *args)
2900 {
2901 	struct compound_hdr hdr = {
2902 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2903 	};
2904 
2905 	encode_compound_hdr(xdr, req, &hdr);
2906 	encode_sequence(xdr, &args->seq_args, &hdr);
2907 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2908 	encode_layoutget(xdr, args, &hdr);
2909 
2910 	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2911 	    args->layout.pages, 0, args->layout.pglen);
2912 
2913 	encode_nops(&hdr);
2914 }
2915 
2916 /*
2917  *  Encode LAYOUTCOMMIT request
2918  */
2919 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
2920 				      struct xdr_stream *xdr,
2921 				      struct nfs4_layoutcommit_args *args)
2922 {
2923 	struct nfs4_layoutcommit_data *data =
2924 		container_of(args, struct nfs4_layoutcommit_data, args);
2925 	struct compound_hdr hdr = {
2926 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2927 	};
2928 
2929 	encode_compound_hdr(xdr, req, &hdr);
2930 	encode_sequence(xdr, &args->seq_args, &hdr);
2931 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2932 	encode_layoutcommit(xdr, data->args.inode, args, &hdr);
2933 	encode_getfattr(xdr, args->bitmask, &hdr);
2934 	encode_nops(&hdr);
2935 }
2936 
2937 /*
2938  * Encode LAYOUTRETURN request
2939  */
2940 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
2941 				      struct xdr_stream *xdr,
2942 				      struct nfs4_layoutreturn_args *args)
2943 {
2944 	struct compound_hdr hdr = {
2945 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2946 	};
2947 
2948 	encode_compound_hdr(xdr, req, &hdr);
2949 	encode_sequence(xdr, &args->seq_args, &hdr);
2950 	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2951 	encode_layoutreturn(xdr, args, &hdr);
2952 	encode_nops(&hdr);
2953 }
2954 
2955 /*
2956  * Encode SECINFO_NO_NAME request
2957  */
2958 static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
2959 					struct xdr_stream *xdr,
2960 					struct nfs41_secinfo_no_name_args *args)
2961 {
2962 	struct compound_hdr hdr = {
2963 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2964 	};
2965 
2966 	encode_compound_hdr(xdr, req, &hdr);
2967 	encode_sequence(xdr, &args->seq_args, &hdr);
2968 	encode_putrootfh(xdr, &hdr);
2969 	encode_secinfo_no_name(xdr, args, &hdr);
2970 	encode_nops(&hdr);
2971 	return 0;
2972 }
2973 
2974 /*
2975  *  Encode TEST_STATEID request
2976  */
2977 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
2978 				      struct xdr_stream *xdr,
2979 				      struct nfs41_test_stateid_args *args)
2980 {
2981 	struct compound_hdr hdr = {
2982 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
2983 	};
2984 
2985 	encode_compound_hdr(xdr, req, &hdr);
2986 	encode_sequence(xdr, &args->seq_args, &hdr);
2987 	encode_test_stateid(xdr, args, &hdr);
2988 	encode_nops(&hdr);
2989 }
2990 
2991 /*
2992  *  Encode FREE_STATEID request
2993  */
2994 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
2995 				     struct xdr_stream *xdr,
2996 				     struct nfs41_free_stateid_args *args)
2997 {
2998 	struct compound_hdr hdr = {
2999 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
3000 	};
3001 
3002 	encode_compound_hdr(xdr, req, &hdr);
3003 	encode_sequence(xdr, &args->seq_args, &hdr);
3004 	encode_free_stateid(xdr, args, &hdr);
3005 	encode_nops(&hdr);
3006 }
3007 #endif /* CONFIG_NFS_V4_1 */
3008 
3009 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
3010 {
3011 	dprintk("nfs: %s: prematurely hit end of receive buffer. "
3012 		"Remaining buffer length is %tu words.\n",
3013 		func, xdr->end - xdr->p);
3014 }
3015 
3016 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3017 {
3018 	__be32 *p;
3019 
3020 	p = xdr_inline_decode(xdr, 4);
3021 	if (unlikely(!p))
3022 		goto out_overflow;
3023 	*len = be32_to_cpup(p);
3024 	p = xdr_inline_decode(xdr, *len);
3025 	if (unlikely(!p))
3026 		goto out_overflow;
3027 	*string = (char *)p;
3028 	return 0;
3029 out_overflow:
3030 	print_overflow_msg(__func__, xdr);
3031 	return -EIO;
3032 }
3033 
3034 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3035 {
3036 	__be32 *p;
3037 
3038 	p = xdr_inline_decode(xdr, 8);
3039 	if (unlikely(!p))
3040 		goto out_overflow;
3041 	hdr->status = be32_to_cpup(p++);
3042 	hdr->taglen = be32_to_cpup(p);
3043 
3044 	p = xdr_inline_decode(xdr, hdr->taglen + 4);
3045 	if (unlikely(!p))
3046 		goto out_overflow;
3047 	hdr->tag = (char *)p;
3048 	p += XDR_QUADLEN(hdr->taglen);
3049 	hdr->nops = be32_to_cpup(p);
3050 	if (unlikely(hdr->nops < 1))
3051 		return nfs4_stat_to_errno(hdr->status);
3052 	return 0;
3053 out_overflow:
3054 	print_overflow_msg(__func__, xdr);
3055 	return -EIO;
3056 }
3057 
3058 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3059 {
3060 	__be32 *p;
3061 	uint32_t opnum;
3062 	int32_t nfserr;
3063 
3064 	p = xdr_inline_decode(xdr, 8);
3065 	if (unlikely(!p))
3066 		goto out_overflow;
3067 	opnum = be32_to_cpup(p++);
3068 	if (opnum != expected) {
3069 		dprintk("nfs: Server returned operation"
3070 			" %d but we issued a request for %d\n",
3071 				opnum, expected);
3072 		return -EIO;
3073 	}
3074 	nfserr = be32_to_cpup(p);
3075 	if (nfserr != NFS_OK)
3076 		return nfs4_stat_to_errno(nfserr);
3077 	return 0;
3078 out_overflow:
3079 	print_overflow_msg(__func__, xdr);
3080 	return -EIO;
3081 }
3082 
3083 /* Dummy routine */
3084 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
3085 {
3086 	__be32 *p;
3087 	unsigned int strlen;
3088 	char *str;
3089 
3090 	p = xdr_inline_decode(xdr, 12);
3091 	if (likely(p))
3092 		return decode_opaque_inline(xdr, &strlen, &str);
3093 	print_overflow_msg(__func__, xdr);
3094 	return -EIO;
3095 }
3096 
3097 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3098 {
3099 	uint32_t bmlen;
3100 	__be32 *p;
3101 
3102 	p = xdr_inline_decode(xdr, 4);
3103 	if (unlikely(!p))
3104 		goto out_overflow;
3105 	bmlen = be32_to_cpup(p);
3106 
3107 	bitmap[0] = bitmap[1] = bitmap[2] = 0;
3108 	p = xdr_inline_decode(xdr, (bmlen << 2));
3109 	if (unlikely(!p))
3110 		goto out_overflow;
3111 	if (bmlen > 0) {
3112 		bitmap[0] = be32_to_cpup(p++);
3113 		if (bmlen > 1) {
3114 			bitmap[1] = be32_to_cpup(p++);
3115 			if (bmlen > 2)
3116 				bitmap[2] = be32_to_cpup(p);
3117 		}
3118 	}
3119 	return 0;
3120 out_overflow:
3121 	print_overflow_msg(__func__, xdr);
3122 	return -EIO;
3123 }
3124 
3125 static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, __be32 **savep)
3126 {
3127 	__be32 *p;
3128 
3129 	p = xdr_inline_decode(xdr, 4);
3130 	if (unlikely(!p))
3131 		goto out_overflow;
3132 	*attrlen = be32_to_cpup(p);
3133 	*savep = xdr->p;
3134 	return 0;
3135 out_overflow:
3136 	print_overflow_msg(__func__, xdr);
3137 	return -EIO;
3138 }
3139 
3140 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3141 {
3142 	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3143 		int ret;
3144 		ret = decode_attr_bitmap(xdr, bitmask);
3145 		if (unlikely(ret < 0))
3146 			return ret;
3147 		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3148 	} else
3149 		bitmask[0] = bitmask[1] = bitmask[2] = 0;
3150 	dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3151 		bitmask[0], bitmask[1], bitmask[2]);
3152 	return 0;
3153 }
3154 
3155 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3156 {
3157 	__be32 *p;
3158 	int ret = 0;
3159 
3160 	*type = 0;
3161 	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3162 		return -EIO;
3163 	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3164 		p = xdr_inline_decode(xdr, 4);
3165 		if (unlikely(!p))
3166 			goto out_overflow;
3167 		*type = be32_to_cpup(p);
3168 		if (*type < NF4REG || *type > NF4NAMEDATTR) {
3169 			dprintk("%s: bad type %d\n", __func__, *type);
3170 			return -EIO;
3171 		}
3172 		bitmap[0] &= ~FATTR4_WORD0_TYPE;
3173 		ret = NFS_ATTR_FATTR_TYPE;
3174 	}
3175 	dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3176 	return ret;
3177 out_overflow:
3178 	print_overflow_msg(__func__, xdr);
3179 	return -EIO;
3180 }
3181 
3182 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3183 {
3184 	__be32 *p;
3185 	int ret = 0;
3186 
3187 	*change = 0;
3188 	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3189 		return -EIO;
3190 	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3191 		p = xdr_inline_decode(xdr, 8);
3192 		if (unlikely(!p))
3193 			goto out_overflow;
3194 		xdr_decode_hyper(p, change);
3195 		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3196 		ret = NFS_ATTR_FATTR_CHANGE;
3197 	}
3198 	dprintk("%s: change attribute=%Lu\n", __func__,
3199 			(unsigned long long)*change);
3200 	return ret;
3201 out_overflow:
3202 	print_overflow_msg(__func__, xdr);
3203 	return -EIO;
3204 }
3205 
3206 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3207 {
3208 	__be32 *p;
3209 	int ret = 0;
3210 
3211 	*size = 0;
3212 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3213 		return -EIO;
3214 	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3215 		p = xdr_inline_decode(xdr, 8);
3216 		if (unlikely(!p))
3217 			goto out_overflow;
3218 		xdr_decode_hyper(p, size);
3219 		bitmap[0] &= ~FATTR4_WORD0_SIZE;
3220 		ret = NFS_ATTR_FATTR_SIZE;
3221 	}
3222 	dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3223 	return ret;
3224 out_overflow:
3225 	print_overflow_msg(__func__, xdr);
3226 	return -EIO;
3227 }
3228 
3229 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3230 {
3231 	__be32 *p;
3232 
3233 	*res = 0;
3234 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3235 		return -EIO;
3236 	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3237 		p = xdr_inline_decode(xdr, 4);
3238 		if (unlikely(!p))
3239 			goto out_overflow;
3240 		*res = be32_to_cpup(p);
3241 		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3242 	}
3243 	dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3244 	return 0;
3245 out_overflow:
3246 	print_overflow_msg(__func__, xdr);
3247 	return -EIO;
3248 }
3249 
3250 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3251 {
3252 	__be32 *p;
3253 
3254 	*res = 0;
3255 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3256 		return -EIO;
3257 	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3258 		p = xdr_inline_decode(xdr, 4);
3259 		if (unlikely(!p))
3260 			goto out_overflow;
3261 		*res = be32_to_cpup(p);
3262 		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3263 	}
3264 	dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3265 	return 0;
3266 out_overflow:
3267 	print_overflow_msg(__func__, xdr);
3268 	return -EIO;
3269 }
3270 
3271 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3272 {
3273 	__be32 *p;
3274 	int ret = 0;
3275 
3276 	fsid->major = 0;
3277 	fsid->minor = 0;
3278 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3279 		return -EIO;
3280 	if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3281 		p = xdr_inline_decode(xdr, 16);
3282 		if (unlikely(!p))
3283 			goto out_overflow;
3284 		p = xdr_decode_hyper(p, &fsid->major);
3285 		xdr_decode_hyper(p, &fsid->minor);
3286 		bitmap[0] &= ~FATTR4_WORD0_FSID;
3287 		ret = NFS_ATTR_FATTR_FSID;
3288 	}
3289 	dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3290 			(unsigned long long)fsid->major,
3291 			(unsigned long long)fsid->minor);
3292 	return ret;
3293 out_overflow:
3294 	print_overflow_msg(__func__, xdr);
3295 	return -EIO;
3296 }
3297 
3298 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3299 {
3300 	__be32 *p;
3301 
3302 	*res = 60;
3303 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3304 		return -EIO;
3305 	if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3306 		p = xdr_inline_decode(xdr, 4);
3307 		if (unlikely(!p))
3308 			goto out_overflow;
3309 		*res = be32_to_cpup(p);
3310 		bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3311 	}
3312 	dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3313 	return 0;
3314 out_overflow:
3315 	print_overflow_msg(__func__, xdr);
3316 	return -EIO;
3317 }
3318 
3319 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3320 {
3321 	__be32 *p;
3322 
3323 	if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3324 		return -EIO;
3325 	if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3326 		p = xdr_inline_decode(xdr, 4);
3327 		if (unlikely(!p))
3328 			goto out_overflow;
3329 		bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3330 		*res = -be32_to_cpup(p);
3331 	}
3332 	return 0;
3333 out_overflow:
3334 	print_overflow_msg(__func__, xdr);
3335 	return -EIO;
3336 }
3337 
3338 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3339 {
3340 	__be32 *p;
3341 	int len;
3342 
3343 	if (fh != NULL)
3344 		memset(fh, 0, sizeof(*fh));
3345 
3346 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3347 		return -EIO;
3348 	if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3349 		p = xdr_inline_decode(xdr, 4);
3350 		if (unlikely(!p))
3351 			goto out_overflow;
3352 		len = be32_to_cpup(p);
3353 		if (len > NFS4_FHSIZE)
3354 			return -EIO;
3355 		p = xdr_inline_decode(xdr, len);
3356 		if (unlikely(!p))
3357 			goto out_overflow;
3358 		if (fh != NULL) {
3359 			memcpy(fh->data, p, len);
3360 			fh->size = len;
3361 		}
3362 		bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3363 	}
3364 	return 0;
3365 out_overflow:
3366 	print_overflow_msg(__func__, xdr);
3367 	return -EIO;
3368 }
3369 
3370 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3371 {
3372 	__be32 *p;
3373 
3374 	*res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
3375 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3376 		return -EIO;
3377 	if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3378 		p = xdr_inline_decode(xdr, 4);
3379 		if (unlikely(!p))
3380 			goto out_overflow;
3381 		*res = be32_to_cpup(p);
3382 		bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3383 	}
3384 	dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3385 	return 0;
3386 out_overflow:
3387 	print_overflow_msg(__func__, xdr);
3388 	return -EIO;
3389 }
3390 
3391 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3392 {
3393 	__be32 *p;
3394 	int ret = 0;
3395 
3396 	*fileid = 0;
3397 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3398 		return -EIO;
3399 	if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3400 		p = xdr_inline_decode(xdr, 8);
3401 		if (unlikely(!p))
3402 			goto out_overflow;
3403 		xdr_decode_hyper(p, fileid);
3404 		bitmap[0] &= ~FATTR4_WORD0_FILEID;
3405 		ret = NFS_ATTR_FATTR_FILEID;
3406 	}
3407 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3408 	return ret;
3409 out_overflow:
3410 	print_overflow_msg(__func__, xdr);
3411 	return -EIO;
3412 }
3413 
3414 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3415 {
3416 	__be32 *p;
3417 	int ret = 0;
3418 
3419 	*fileid = 0;
3420 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3421 		return -EIO;
3422 	if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3423 		p = xdr_inline_decode(xdr, 8);
3424 		if (unlikely(!p))
3425 			goto out_overflow;
3426 		xdr_decode_hyper(p, fileid);
3427 		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3428 		ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3429 	}
3430 	dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3431 	return ret;
3432 out_overflow:
3433 	print_overflow_msg(__func__, xdr);
3434 	return -EIO;
3435 }
3436 
3437 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3438 {
3439 	__be32 *p;
3440 	int status = 0;
3441 
3442 	*res = 0;
3443 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3444 		return -EIO;
3445 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3446 		p = xdr_inline_decode(xdr, 8);
3447 		if (unlikely(!p))
3448 			goto out_overflow;
3449 		xdr_decode_hyper(p, res);
3450 		bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3451 	}
3452 	dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3453 	return status;
3454 out_overflow:
3455 	print_overflow_msg(__func__, xdr);
3456 	return -EIO;
3457 }
3458 
3459 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3460 {
3461 	__be32 *p;
3462 	int status = 0;
3463 
3464 	*res = 0;
3465 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3466 		return -EIO;
3467 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3468 		p = xdr_inline_decode(xdr, 8);
3469 		if (unlikely(!p))
3470 			goto out_overflow;
3471 		xdr_decode_hyper(p, res);
3472 		bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3473 	}
3474 	dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3475 	return status;
3476 out_overflow:
3477 	print_overflow_msg(__func__, xdr);
3478 	return -EIO;
3479 }
3480 
3481 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3482 {
3483 	__be32 *p;
3484 	int status = 0;
3485 
3486 	*res = 0;
3487 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3488 		return -EIO;
3489 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3490 		p = xdr_inline_decode(xdr, 8);
3491 		if (unlikely(!p))
3492 			goto out_overflow;
3493 		xdr_decode_hyper(p, res);
3494 		bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3495 	}
3496 	dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3497 	return status;
3498 out_overflow:
3499 	print_overflow_msg(__func__, xdr);
3500 	return -EIO;
3501 }
3502 
3503 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3504 {
3505 	u32 n;
3506 	__be32 *p;
3507 	int status = 0;
3508 
3509 	p = xdr_inline_decode(xdr, 4);
3510 	if (unlikely(!p))
3511 		goto out_overflow;
3512 	n = be32_to_cpup(p);
3513 	if (n == 0)
3514 		goto root_path;
3515 	dprintk("path ");
3516 	path->ncomponents = 0;
3517 	while (path->ncomponents < n) {
3518 		struct nfs4_string *component = &path->components[path->ncomponents];
3519 		status = decode_opaque_inline(xdr, &component->len, &component->data);
3520 		if (unlikely(status != 0))
3521 			goto out_eio;
3522 		if (path->ncomponents != n)
3523 			dprintk("/");
3524 		dprintk("%s", component->data);
3525 		if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
3526 			path->ncomponents++;
3527 		else {
3528 			dprintk("cannot parse %d components in path\n", n);
3529 			goto out_eio;
3530 		}
3531 	}
3532 out:
3533 	dprintk("\n");
3534 	return status;
3535 root_path:
3536 /* a root pathname is sent as a zero component4 */
3537 	path->ncomponents = 1;
3538 	path->components[0].len=0;
3539 	path->components[0].data=NULL;
3540 	dprintk("path /\n");
3541 	goto out;
3542 out_eio:
3543 	dprintk(" status %d", status);
3544 	status = -EIO;
3545 	goto out;
3546 out_overflow:
3547 	print_overflow_msg(__func__, xdr);
3548 	return -EIO;
3549 }
3550 
3551 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3552 {
3553 	int n;
3554 	__be32 *p;
3555 	int status = -EIO;
3556 
3557 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3558 		goto out;
3559 	status = 0;
3560 	if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3561 		goto out;
3562 	dprintk("%s: fsroot ", __func__);
3563 	status = decode_pathname(xdr, &res->fs_path);
3564 	if (unlikely(status != 0))
3565 		goto out;
3566 	p = xdr_inline_decode(xdr, 4);
3567 	if (unlikely(!p))
3568 		goto out_overflow;
3569 	n = be32_to_cpup(p);
3570 	if (n <= 0)
3571 		goto out_eio;
3572 	res->nlocations = 0;
3573 	while (res->nlocations < n) {
3574 		u32 m;
3575 		struct nfs4_fs_location *loc = &res->locations[res->nlocations];
3576 
3577 		p = xdr_inline_decode(xdr, 4);
3578 		if (unlikely(!p))
3579 			goto out_overflow;
3580 		m = be32_to_cpup(p);
3581 
3582 		loc->nservers = 0;
3583 		dprintk("%s: servers ", __func__);
3584 		while (loc->nservers < m) {
3585 			struct nfs4_string *server = &loc->servers[loc->nservers];
3586 			status = decode_opaque_inline(xdr, &server->len, &server->data);
3587 			if (unlikely(status != 0))
3588 				goto out_eio;
3589 			dprintk("%s ", server->data);
3590 			if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
3591 				loc->nservers++;
3592 			else {
3593 				unsigned int i;
3594 				dprintk("%s: using first %u of %u servers "
3595 					"returned for location %u\n",
3596 						__func__,
3597 						NFS4_FS_LOCATION_MAXSERVERS,
3598 						m, res->nlocations);
3599 				for (i = loc->nservers; i < m; i++) {
3600 					unsigned int len;
3601 					char *data;
3602 					status = decode_opaque_inline(xdr, &len, &data);
3603 					if (unlikely(status != 0))
3604 						goto out_eio;
3605 				}
3606 			}
3607 		}
3608 		status = decode_pathname(xdr, &loc->rootpath);
3609 		if (unlikely(status != 0))
3610 			goto out_eio;
3611 		if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
3612 			res->nlocations++;
3613 	}
3614 	if (res->nlocations != 0)
3615 		status = NFS_ATTR_FATTR_V4_REFERRAL;
3616 out:
3617 	dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3618 	return status;
3619 out_overflow:
3620 	print_overflow_msg(__func__, xdr);
3621 out_eio:
3622 	status = -EIO;
3623 	goto out;
3624 }
3625 
3626 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3627 {
3628 	__be32 *p;
3629 	int status = 0;
3630 
3631 	*res = 0;
3632 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3633 		return -EIO;
3634 	if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3635 		p = xdr_inline_decode(xdr, 8);
3636 		if (unlikely(!p))
3637 			goto out_overflow;
3638 		xdr_decode_hyper(p, res);
3639 		bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3640 	}
3641 	dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3642 	return status;
3643 out_overflow:
3644 	print_overflow_msg(__func__, xdr);
3645 	return -EIO;
3646 }
3647 
3648 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3649 {
3650 	__be32 *p;
3651 	int status = 0;
3652 
3653 	*maxlink = 1;
3654 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3655 		return -EIO;
3656 	if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3657 		p = xdr_inline_decode(xdr, 4);
3658 		if (unlikely(!p))
3659 			goto out_overflow;
3660 		*maxlink = be32_to_cpup(p);
3661 		bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3662 	}
3663 	dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3664 	return status;
3665 out_overflow:
3666 	print_overflow_msg(__func__, xdr);
3667 	return -EIO;
3668 }
3669 
3670 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3671 {
3672 	__be32 *p;
3673 	int status = 0;
3674 
3675 	*maxname = 1024;
3676 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3677 		return -EIO;
3678 	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3679 		p = xdr_inline_decode(xdr, 4);
3680 		if (unlikely(!p))
3681 			goto out_overflow;
3682 		*maxname = be32_to_cpup(p);
3683 		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3684 	}
3685 	dprintk("%s: maxname=%u\n", __func__, *maxname);
3686 	return status;
3687 out_overflow:
3688 	print_overflow_msg(__func__, xdr);
3689 	return -EIO;
3690 }
3691 
3692 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3693 {
3694 	__be32 *p;
3695 	int status = 0;
3696 
3697 	*res = 1024;
3698 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3699 		return -EIO;
3700 	if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3701 		uint64_t maxread;
3702 		p = xdr_inline_decode(xdr, 8);
3703 		if (unlikely(!p))
3704 			goto out_overflow;
3705 		xdr_decode_hyper(p, &maxread);
3706 		if (maxread > 0x7FFFFFFF)
3707 			maxread = 0x7FFFFFFF;
3708 		*res = (uint32_t)maxread;
3709 		bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3710 	}
3711 	dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3712 	return status;
3713 out_overflow:
3714 	print_overflow_msg(__func__, xdr);
3715 	return -EIO;
3716 }
3717 
3718 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3719 {
3720 	__be32 *p;
3721 	int status = 0;
3722 
3723 	*res = 1024;
3724 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3725 		return -EIO;
3726 	if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3727 		uint64_t maxwrite;
3728 		p = xdr_inline_decode(xdr, 8);
3729 		if (unlikely(!p))
3730 			goto out_overflow;
3731 		xdr_decode_hyper(p, &maxwrite);
3732 		if (maxwrite > 0x7FFFFFFF)
3733 			maxwrite = 0x7FFFFFFF;
3734 		*res = (uint32_t)maxwrite;
3735 		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3736 	}
3737 	dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3738 	return status;
3739 out_overflow:
3740 	print_overflow_msg(__func__, xdr);
3741 	return -EIO;
3742 }
3743 
3744 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3745 {
3746 	uint32_t tmp;
3747 	__be32 *p;
3748 	int ret = 0;
3749 
3750 	*mode = 0;
3751 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3752 		return -EIO;
3753 	if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3754 		p = xdr_inline_decode(xdr, 4);
3755 		if (unlikely(!p))
3756 			goto out_overflow;
3757 		tmp = be32_to_cpup(p);
3758 		*mode = tmp & ~S_IFMT;
3759 		bitmap[1] &= ~FATTR4_WORD1_MODE;
3760 		ret = NFS_ATTR_FATTR_MODE;
3761 	}
3762 	dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3763 	return ret;
3764 out_overflow:
3765 	print_overflow_msg(__func__, xdr);
3766 	return -EIO;
3767 }
3768 
3769 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3770 {
3771 	__be32 *p;
3772 	int ret = 0;
3773 
3774 	*nlink = 1;
3775 	if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3776 		return -EIO;
3777 	if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3778 		p = xdr_inline_decode(xdr, 4);
3779 		if (unlikely(!p))
3780 			goto out_overflow;
3781 		*nlink = be32_to_cpup(p);
3782 		bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3783 		ret = NFS_ATTR_FATTR_NLINK;
3784 	}
3785 	dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3786 	return ret;
3787 out_overflow:
3788 	print_overflow_msg(__func__, xdr);
3789 	return -EIO;
3790 }
3791 
3792 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3793 		const struct nfs_server *server, uint32_t *uid, int may_sleep)
3794 {
3795 	uint32_t len;
3796 	__be32 *p;
3797 	int ret = 0;
3798 
3799 	*uid = -2;
3800 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3801 		return -EIO;
3802 	if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3803 		p = xdr_inline_decode(xdr, 4);
3804 		if (unlikely(!p))
3805 			goto out_overflow;
3806 		len = be32_to_cpup(p);
3807 		p = xdr_inline_decode(xdr, len);
3808 		if (unlikely(!p))
3809 			goto out_overflow;
3810 		if (!may_sleep) {
3811 			/* do nothing */
3812 		} else if (len < XDR_MAX_NETOBJ) {
3813 			if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
3814 				ret = NFS_ATTR_FATTR_OWNER;
3815 			else
3816 				dprintk("%s: nfs_map_name_to_uid failed!\n",
3817 						__func__);
3818 		} else
3819 			dprintk("%s: name too long (%u)!\n",
3820 					__func__, len);
3821 		bitmap[1] &= ~FATTR4_WORD1_OWNER;
3822 	}
3823 	dprintk("%s: uid=%d\n", __func__, (int)*uid);
3824 	return ret;
3825 out_overflow:
3826 	print_overflow_msg(__func__, xdr);
3827 	return -EIO;
3828 }
3829 
3830 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3831 		const struct nfs_server *server, uint32_t *gid, int may_sleep)
3832 {
3833 	uint32_t len;
3834 	__be32 *p;
3835 	int ret = 0;
3836 
3837 	*gid = -2;
3838 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3839 		return -EIO;
3840 	if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3841 		p = xdr_inline_decode(xdr, 4);
3842 		if (unlikely(!p))
3843 			goto out_overflow;
3844 		len = be32_to_cpup(p);
3845 		p = xdr_inline_decode(xdr, len);
3846 		if (unlikely(!p))
3847 			goto out_overflow;
3848 		if (!may_sleep) {
3849 			/* do nothing */
3850 		} else if (len < XDR_MAX_NETOBJ) {
3851 			if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
3852 				ret = NFS_ATTR_FATTR_GROUP;
3853 			else
3854 				dprintk("%s: nfs_map_group_to_gid failed!\n",
3855 						__func__);
3856 		} else
3857 			dprintk("%s: name too long (%u)!\n",
3858 					__func__, len);
3859 		bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3860 	}
3861 	dprintk("%s: gid=%d\n", __func__, (int)*gid);
3862 	return ret;
3863 out_overflow:
3864 	print_overflow_msg(__func__, xdr);
3865 	return -EIO;
3866 }
3867 
3868 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3869 {
3870 	uint32_t major = 0, minor = 0;
3871 	__be32 *p;
3872 	int ret = 0;
3873 
3874 	*rdev = MKDEV(0,0);
3875 	if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3876 		return -EIO;
3877 	if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3878 		dev_t tmp;
3879 
3880 		p = xdr_inline_decode(xdr, 8);
3881 		if (unlikely(!p))
3882 			goto out_overflow;
3883 		major = be32_to_cpup(p++);
3884 		minor = be32_to_cpup(p);
3885 		tmp = MKDEV(major, minor);
3886 		if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3887 			*rdev = tmp;
3888 		bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3889 		ret = NFS_ATTR_FATTR_RDEV;
3890 	}
3891 	dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3892 	return ret;
3893 out_overflow:
3894 	print_overflow_msg(__func__, xdr);
3895 	return -EIO;
3896 }
3897 
3898 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3899 {
3900 	__be32 *p;
3901 	int status = 0;
3902 
3903 	*res = 0;
3904 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3905 		return -EIO;
3906 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3907 		p = xdr_inline_decode(xdr, 8);
3908 		if (unlikely(!p))
3909 			goto out_overflow;
3910 		xdr_decode_hyper(p, res);
3911 		bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3912 	}
3913 	dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3914 	return status;
3915 out_overflow:
3916 	print_overflow_msg(__func__, xdr);
3917 	return -EIO;
3918 }
3919 
3920 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3921 {
3922 	__be32 *p;
3923 	int status = 0;
3924 
3925 	*res = 0;
3926 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3927 		return -EIO;
3928 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3929 		p = xdr_inline_decode(xdr, 8);
3930 		if (unlikely(!p))
3931 			goto out_overflow;
3932 		xdr_decode_hyper(p, res);
3933 		bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3934 	}
3935 	dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3936 	return status;
3937 out_overflow:
3938 	print_overflow_msg(__func__, xdr);
3939 	return -EIO;
3940 }
3941 
3942 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3943 {
3944 	__be32 *p;
3945 	int status = 0;
3946 
3947 	*res = 0;
3948 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
3949 		return -EIO;
3950 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3951 		p = xdr_inline_decode(xdr, 8);
3952 		if (unlikely(!p))
3953 			goto out_overflow;
3954 		xdr_decode_hyper(p, res);
3955 		bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
3956 	}
3957 	dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
3958 	return status;
3959 out_overflow:
3960 	print_overflow_msg(__func__, xdr);
3961 	return -EIO;
3962 }
3963 
3964 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
3965 {
3966 	__be32 *p;
3967 	int ret = 0;
3968 
3969 	*used = 0;
3970 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
3971 		return -EIO;
3972 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
3973 		p = xdr_inline_decode(xdr, 8);
3974 		if (unlikely(!p))
3975 			goto out_overflow;
3976 		xdr_decode_hyper(p, used);
3977 		bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
3978 		ret = NFS_ATTR_FATTR_SPACE_USED;
3979 	}
3980 	dprintk("%s: space used=%Lu\n", __func__,
3981 			(unsigned long long)*used);
3982 	return ret;
3983 out_overflow:
3984 	print_overflow_msg(__func__, xdr);
3985 	return -EIO;
3986 }
3987 
3988 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
3989 {
3990 	__be32 *p;
3991 	uint64_t sec;
3992 	uint32_t nsec;
3993 
3994 	p = xdr_inline_decode(xdr, 12);
3995 	if (unlikely(!p))
3996 		goto out_overflow;
3997 	p = xdr_decode_hyper(p, &sec);
3998 	nsec = be32_to_cpup(p);
3999 	time->tv_sec = (time_t)sec;
4000 	time->tv_nsec = (long)nsec;
4001 	return 0;
4002 out_overflow:
4003 	print_overflow_msg(__func__, xdr);
4004 	return -EIO;
4005 }
4006 
4007 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4008 {
4009 	int status = 0;
4010 
4011 	time->tv_sec = 0;
4012 	time->tv_nsec = 0;
4013 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4014 		return -EIO;
4015 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4016 		status = decode_attr_time(xdr, time);
4017 		if (status == 0)
4018 			status = NFS_ATTR_FATTR_ATIME;
4019 		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4020 	}
4021 	dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4022 	return status;
4023 }
4024 
4025 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4026 {
4027 	int status = 0;
4028 
4029 	time->tv_sec = 0;
4030 	time->tv_nsec = 0;
4031 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4032 		return -EIO;
4033 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4034 		status = decode_attr_time(xdr, time);
4035 		if (status == 0)
4036 			status = NFS_ATTR_FATTR_CTIME;
4037 		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4038 	}
4039 	dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4040 	return status;
4041 }
4042 
4043 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4044 				  struct timespec *time)
4045 {
4046 	int status = 0;
4047 
4048 	time->tv_sec = 0;
4049 	time->tv_nsec = 0;
4050 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4051 		return -EIO;
4052 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4053 		status = decode_attr_time(xdr, time);
4054 		bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4055 	}
4056 	dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4057 		(long)time->tv_nsec);
4058 	return status;
4059 }
4060 
4061 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4062 {
4063 	int status = 0;
4064 
4065 	time->tv_sec = 0;
4066 	time->tv_nsec = 0;
4067 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4068 		return -EIO;
4069 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4070 		status = decode_attr_time(xdr, time);
4071 		if (status == 0)
4072 			status = NFS_ATTR_FATTR_MTIME;
4073 		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4074 	}
4075 	dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4076 	return status;
4077 }
4078 
4079 static int verify_attr_len(struct xdr_stream *xdr, __be32 *savep, uint32_t attrlen)
4080 {
4081 	unsigned int attrwords = XDR_QUADLEN(attrlen);
4082 	unsigned int nwords = xdr->p - savep;
4083 
4084 	if (unlikely(attrwords != nwords)) {
4085 		dprintk("%s: server returned incorrect attribute length: "
4086 			"%u %c %u\n",
4087 				__func__,
4088 				attrwords << 2,
4089 				(attrwords < nwords) ? '<' : '>',
4090 				nwords << 2);
4091 		return -EIO;
4092 	}
4093 	return 0;
4094 }
4095 
4096 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4097 {
4098 	__be32 *p;
4099 
4100 	p = xdr_inline_decode(xdr, 20);
4101 	if (unlikely(!p))
4102 		goto out_overflow;
4103 	cinfo->atomic = be32_to_cpup(p++);
4104 	p = xdr_decode_hyper(p, &cinfo->before);
4105 	xdr_decode_hyper(p, &cinfo->after);
4106 	return 0;
4107 out_overflow:
4108 	print_overflow_msg(__func__, xdr);
4109 	return -EIO;
4110 }
4111 
4112 static int decode_access(struct xdr_stream *xdr, struct nfs4_accessres *access)
4113 {
4114 	__be32 *p;
4115 	uint32_t supp, acc;
4116 	int status;
4117 
4118 	status = decode_op_hdr(xdr, OP_ACCESS);
4119 	if (status)
4120 		return status;
4121 	p = xdr_inline_decode(xdr, 8);
4122 	if (unlikely(!p))
4123 		goto out_overflow;
4124 	supp = be32_to_cpup(p++);
4125 	acc = be32_to_cpup(p);
4126 	access->supported = supp;
4127 	access->access = acc;
4128 	return 0;
4129 out_overflow:
4130 	print_overflow_msg(__func__, xdr);
4131 	return -EIO;
4132 }
4133 
4134 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4135 {
4136 	__be32 *p;
4137 
4138 	p = xdr_inline_decode(xdr, len);
4139 	if (likely(p)) {
4140 		memcpy(buf, p, len);
4141 		return 0;
4142 	}
4143 	print_overflow_msg(__func__, xdr);
4144 	return -EIO;
4145 }
4146 
4147 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4148 {
4149 	return decode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE);
4150 }
4151 
4152 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4153 {
4154 	int status;
4155 
4156 	status = decode_op_hdr(xdr, OP_CLOSE);
4157 	if (status != -EIO)
4158 		nfs_increment_open_seqid(status, res->seqid);
4159 	if (!status)
4160 		status = decode_stateid(xdr, &res->stateid);
4161 	return status;
4162 }
4163 
4164 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4165 {
4166 	return decode_opaque_fixed(xdr, verifier, 8);
4167 }
4168 
4169 static int decode_commit(struct xdr_stream *xdr, struct nfs_writeres *res)
4170 {
4171 	int status;
4172 
4173 	status = decode_op_hdr(xdr, OP_COMMIT);
4174 	if (!status)
4175 		status = decode_verifier(xdr, res->verf->verifier);
4176 	return status;
4177 }
4178 
4179 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4180 {
4181 	__be32 *p;
4182 	uint32_t bmlen;
4183 	int status;
4184 
4185 	status = decode_op_hdr(xdr, OP_CREATE);
4186 	if (status)
4187 		return status;
4188 	if ((status = decode_change_info(xdr, cinfo)))
4189 		return status;
4190 	p = xdr_inline_decode(xdr, 4);
4191 	if (unlikely(!p))
4192 		goto out_overflow;
4193 	bmlen = be32_to_cpup(p);
4194 	p = xdr_inline_decode(xdr, bmlen << 2);
4195 	if (likely(p))
4196 		return 0;
4197 out_overflow:
4198 	print_overflow_msg(__func__, xdr);
4199 	return -EIO;
4200 }
4201 
4202 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4203 {
4204 	__be32 *savep;
4205 	uint32_t attrlen, bitmap[3] = {0};
4206 	int status;
4207 
4208 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4209 		goto xdr_error;
4210 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4211 		goto xdr_error;
4212 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4213 		goto xdr_error;
4214 	if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4215 		goto xdr_error;
4216 	if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4217 		goto xdr_error;
4218 	if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4219 		goto xdr_error;
4220 	if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4221 		goto xdr_error;
4222 	status = verify_attr_len(xdr, savep, attrlen);
4223 xdr_error:
4224 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4225 	return status;
4226 }
4227 
4228 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4229 {
4230 	__be32 *savep;
4231 	uint32_t attrlen, bitmap[3] = {0};
4232 	int status;
4233 
4234 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4235 		goto xdr_error;
4236 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4237 		goto xdr_error;
4238 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4239 		goto xdr_error;
4240 
4241 	if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4242 		goto xdr_error;
4243 	if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4244 		goto xdr_error;
4245 	if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4246 		goto xdr_error;
4247 	if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4248 		goto xdr_error;
4249 	if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4250 		goto xdr_error;
4251 	if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4252 		goto xdr_error;
4253 
4254 	status = verify_attr_len(xdr, savep, attrlen);
4255 xdr_error:
4256 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4257 	return status;
4258 }
4259 
4260 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4261 {
4262 	__be32 *savep;
4263 	uint32_t attrlen, bitmap[3] = {0};
4264 	int status;
4265 
4266 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4267 		goto xdr_error;
4268 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4269 		goto xdr_error;
4270 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4271 		goto xdr_error;
4272 
4273 	if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4274 		goto xdr_error;
4275 	if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4276 		goto xdr_error;
4277 
4278 	status = verify_attr_len(xdr, savep, attrlen);
4279 xdr_error:
4280 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4281 	return status;
4282 }
4283 
4284 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4285 		struct nfs_fattr *fattr, struct nfs_fh *fh,
4286 		const struct nfs_server *server, int may_sleep)
4287 {
4288 	int status;
4289 	umode_t fmode = 0;
4290 	uint32_t type;
4291 	int32_t err;
4292 
4293 	status = decode_attr_type(xdr, bitmap, &type);
4294 	if (status < 0)
4295 		goto xdr_error;
4296 	fattr->mode = 0;
4297 	if (status != 0) {
4298 		fattr->mode |= nfs_type2fmt[type];
4299 		fattr->valid |= status;
4300 	}
4301 
4302 	status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4303 	if (status < 0)
4304 		goto xdr_error;
4305 	fattr->valid |= status;
4306 
4307 	status = decode_attr_size(xdr, bitmap, &fattr->size);
4308 	if (status < 0)
4309 		goto xdr_error;
4310 	fattr->valid |= status;
4311 
4312 	status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4313 	if (status < 0)
4314 		goto xdr_error;
4315 	fattr->valid |= status;
4316 
4317 	err = 0;
4318 	status = decode_attr_error(xdr, bitmap, &err);
4319 	if (status < 0)
4320 		goto xdr_error;
4321 	if (err == -NFS4ERR_WRONGSEC)
4322 		nfs_fixup_secinfo_attributes(fattr, fh);
4323 
4324 	status = decode_attr_filehandle(xdr, bitmap, fh);
4325 	if (status < 0)
4326 		goto xdr_error;
4327 
4328 	status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4329 	if (status < 0)
4330 		goto xdr_error;
4331 	fattr->valid |= status;
4332 
4333 	status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
4334 						struct nfs4_fs_locations,
4335 						fattr));
4336 	if (status < 0)
4337 		goto xdr_error;
4338 	fattr->valid |= status;
4339 
4340 	status = decode_attr_mode(xdr, bitmap, &fmode);
4341 	if (status < 0)
4342 		goto xdr_error;
4343 	if (status != 0) {
4344 		fattr->mode |= fmode;
4345 		fattr->valid |= status;
4346 	}
4347 
4348 	status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4349 	if (status < 0)
4350 		goto xdr_error;
4351 	fattr->valid |= status;
4352 
4353 	status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, may_sleep);
4354 	if (status < 0)
4355 		goto xdr_error;
4356 	fattr->valid |= status;
4357 
4358 	status = decode_attr_group(xdr, bitmap, server, &fattr->gid, may_sleep);
4359 	if (status < 0)
4360 		goto xdr_error;
4361 	fattr->valid |= status;
4362 
4363 	status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4364 	if (status < 0)
4365 		goto xdr_error;
4366 	fattr->valid |= status;
4367 
4368 	status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4369 	if (status < 0)
4370 		goto xdr_error;
4371 	fattr->valid |= status;
4372 
4373 	status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4374 	if (status < 0)
4375 		goto xdr_error;
4376 	fattr->valid |= status;
4377 
4378 	status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4379 	if (status < 0)
4380 		goto xdr_error;
4381 	fattr->valid |= status;
4382 
4383 	status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4384 	if (status < 0)
4385 		goto xdr_error;
4386 	fattr->valid |= status;
4387 
4388 	status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4389 	if (status < 0)
4390 		goto xdr_error;
4391 	fattr->valid |= status;
4392 
4393 xdr_error:
4394 	dprintk("%s: xdr returned %d\n", __func__, -status);
4395 	return status;
4396 }
4397 
4398 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4399 		struct nfs_fh *fh, const struct nfs_server *server, int may_sleep)
4400 {
4401 	__be32 *savep;
4402 	uint32_t attrlen,
4403 		 bitmap[3] = {0};
4404 	int status;
4405 
4406 	status = decode_op_hdr(xdr, OP_GETATTR);
4407 	if (status < 0)
4408 		goto xdr_error;
4409 
4410 	status = decode_attr_bitmap(xdr, bitmap);
4411 	if (status < 0)
4412 		goto xdr_error;
4413 
4414 	status = decode_attr_length(xdr, &attrlen, &savep);
4415 	if (status < 0)
4416 		goto xdr_error;
4417 
4418 	status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, server, may_sleep);
4419 	if (status < 0)
4420 		goto xdr_error;
4421 
4422 	status = verify_attr_len(xdr, savep, attrlen);
4423 xdr_error:
4424 	dprintk("%s: xdr returned %d\n", __func__, -status);
4425 	return status;
4426 }
4427 
4428 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4429 		const struct nfs_server *server, int may_sleep)
4430 {
4431 	return decode_getfattr_generic(xdr, fattr, NULL, server, may_sleep);
4432 }
4433 
4434 /*
4435  * Decode potentially multiple layout types. Currently we only support
4436  * one layout driver per file system.
4437  */
4438 static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
4439 					 uint32_t *layouttype)
4440 {
4441 	uint32_t *p;
4442 	int num;
4443 
4444 	p = xdr_inline_decode(xdr, 4);
4445 	if (unlikely(!p))
4446 		goto out_overflow;
4447 	num = be32_to_cpup(p);
4448 
4449 	/* pNFS is not supported by the underlying file system */
4450 	if (num == 0) {
4451 		*layouttype = 0;
4452 		return 0;
4453 	}
4454 	if (num > 1)
4455 		printk(KERN_INFO "%s: Warning: Multiple pNFS layout drivers "
4456 			"per filesystem not supported\n", __func__);
4457 
4458 	/* Decode and set first layout type, move xdr->p past unused types */
4459 	p = xdr_inline_decode(xdr, num * 4);
4460 	if (unlikely(!p))
4461 		goto out_overflow;
4462 	*layouttype = be32_to_cpup(p);
4463 	return 0;
4464 out_overflow:
4465 	print_overflow_msg(__func__, xdr);
4466 	return -EIO;
4467 }
4468 
4469 /*
4470  * The type of file system exported.
4471  * Note we must ensure that layouttype is set in any non-error case.
4472  */
4473 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4474 				uint32_t *layouttype)
4475 {
4476 	int status = 0;
4477 
4478 	dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4479 	if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4480 		return -EIO;
4481 	if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4482 		status = decode_first_pnfs_layout_type(xdr, layouttype);
4483 		bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4484 	} else
4485 		*layouttype = 0;
4486 	return status;
4487 }
4488 
4489 /*
4490  * The prefered block size for layout directed io
4491  */
4492 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4493 				      uint32_t *res)
4494 {
4495 	__be32 *p;
4496 
4497 	dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4498 	*res = 0;
4499 	if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4500 		p = xdr_inline_decode(xdr, 4);
4501 		if (unlikely(!p)) {
4502 			print_overflow_msg(__func__, xdr);
4503 			return -EIO;
4504 		}
4505 		*res = be32_to_cpup(p);
4506 		bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4507 	}
4508 	return 0;
4509 }
4510 
4511 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4512 {
4513 	__be32 *savep;
4514 	uint32_t attrlen, bitmap[3];
4515 	int status;
4516 
4517 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4518 		goto xdr_error;
4519 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4520 		goto xdr_error;
4521 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4522 		goto xdr_error;
4523 
4524 	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */
4525 
4526 	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4527 		goto xdr_error;
4528 	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4529 		goto xdr_error;
4530 	if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4531 		goto xdr_error;
4532 	fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4533 	if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4534 		goto xdr_error;
4535 	fsinfo->wtpref = fsinfo->wtmax;
4536 	status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4537 	if (status != 0)
4538 		goto xdr_error;
4539 	status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4540 	if (status != 0)
4541 		goto xdr_error;
4542 	status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4543 	if (status)
4544 		goto xdr_error;
4545 
4546 	status = verify_attr_len(xdr, savep, attrlen);
4547 xdr_error:
4548 	dprintk("%s: xdr returned %d!\n", __func__, -status);
4549 	return status;
4550 }
4551 
4552 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4553 {
4554 	__be32 *p;
4555 	uint32_t len;
4556 	int status;
4557 
4558 	/* Zero handle first to allow comparisons */
4559 	memset(fh, 0, sizeof(*fh));
4560 
4561 	status = decode_op_hdr(xdr, OP_GETFH);
4562 	if (status)
4563 		return status;
4564 
4565 	p = xdr_inline_decode(xdr, 4);
4566 	if (unlikely(!p))
4567 		goto out_overflow;
4568 	len = be32_to_cpup(p);
4569 	if (len > NFS4_FHSIZE)
4570 		return -EIO;
4571 	fh->size = len;
4572 	p = xdr_inline_decode(xdr, len);
4573 	if (unlikely(!p))
4574 		goto out_overflow;
4575 	memcpy(fh->data, p, len);
4576 	return 0;
4577 out_overflow:
4578 	print_overflow_msg(__func__, xdr);
4579 	return -EIO;
4580 }
4581 
4582 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4583 {
4584 	int status;
4585 
4586 	status = decode_op_hdr(xdr, OP_LINK);
4587 	if (status)
4588 		return status;
4589 	return decode_change_info(xdr, cinfo);
4590 }
4591 
4592 /*
4593  * We create the owner, so we know a proper owner.id length is 4.
4594  */
4595 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4596 {
4597 	uint64_t offset, length, clientid;
4598 	__be32 *p;
4599 	uint32_t namelen, type;
4600 
4601 	p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4602 	if (unlikely(!p))
4603 		goto out_overflow;
4604 	p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4605 	p = xdr_decode_hyper(p, &length);
4606 	type = be32_to_cpup(p++); /* 4 byte read */
4607 	if (fl != NULL) { /* manipulate file lock */
4608 		fl->fl_start = (loff_t)offset;
4609 		fl->fl_end = fl->fl_start + (loff_t)length - 1;
4610 		if (length == ~(uint64_t)0)
4611 			fl->fl_end = OFFSET_MAX;
4612 		fl->fl_type = F_WRLCK;
4613 		if (type & 1)
4614 			fl->fl_type = F_RDLCK;
4615 		fl->fl_pid = 0;
4616 	}
4617 	p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4618 	namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4619 	p = xdr_inline_decode(xdr, namelen); /* variable size field */
4620 	if (likely(p))
4621 		return -NFS4ERR_DENIED;
4622 out_overflow:
4623 	print_overflow_msg(__func__, xdr);
4624 	return -EIO;
4625 }
4626 
4627 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4628 {
4629 	int status;
4630 
4631 	status = decode_op_hdr(xdr, OP_LOCK);
4632 	if (status == -EIO)
4633 		goto out;
4634 	if (status == 0) {
4635 		status = decode_stateid(xdr, &res->stateid);
4636 		if (unlikely(status))
4637 			goto out;
4638 	} else if (status == -NFS4ERR_DENIED)
4639 		status = decode_lock_denied(xdr, NULL);
4640 	if (res->open_seqid != NULL)
4641 		nfs_increment_open_seqid(status, res->open_seqid);
4642 	nfs_increment_lock_seqid(status, res->lock_seqid);
4643 out:
4644 	return status;
4645 }
4646 
4647 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4648 {
4649 	int status;
4650 	status = decode_op_hdr(xdr, OP_LOCKT);
4651 	if (status == -NFS4ERR_DENIED)
4652 		return decode_lock_denied(xdr, res->denied);
4653 	return status;
4654 }
4655 
4656 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4657 {
4658 	int status;
4659 
4660 	status = decode_op_hdr(xdr, OP_LOCKU);
4661 	if (status != -EIO)
4662 		nfs_increment_lock_seqid(status, res->seqid);
4663 	if (status == 0)
4664 		status = decode_stateid(xdr, &res->stateid);
4665 	return status;
4666 }
4667 
4668 static int decode_release_lockowner(struct xdr_stream *xdr)
4669 {
4670 	return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4671 }
4672 
4673 static int decode_lookup(struct xdr_stream *xdr)
4674 {
4675 	return decode_op_hdr(xdr, OP_LOOKUP);
4676 }
4677 
4678 /* This is too sick! */
4679 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4680 {
4681 	__be32 *p;
4682 	uint32_t limit_type, nblocks, blocksize;
4683 
4684 	p = xdr_inline_decode(xdr, 12);
4685 	if (unlikely(!p))
4686 		goto out_overflow;
4687 	limit_type = be32_to_cpup(p++);
4688 	switch (limit_type) {
4689 	case 1:
4690 		xdr_decode_hyper(p, maxsize);
4691 		break;
4692 	case 2:
4693 		nblocks = be32_to_cpup(p++);
4694 		blocksize = be32_to_cpup(p);
4695 		*maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4696 	}
4697 	return 0;
4698 out_overflow:
4699 	print_overflow_msg(__func__, xdr);
4700 	return -EIO;
4701 }
4702 
4703 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4704 {
4705 	__be32 *p;
4706 	uint32_t delegation_type;
4707 	int status;
4708 
4709 	p = xdr_inline_decode(xdr, 4);
4710 	if (unlikely(!p))
4711 		goto out_overflow;
4712 	delegation_type = be32_to_cpup(p);
4713 	if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
4714 		res->delegation_type = 0;
4715 		return 0;
4716 	}
4717 	status = decode_stateid(xdr, &res->delegation);
4718 	if (unlikely(status))
4719 		return status;
4720 	p = xdr_inline_decode(xdr, 4);
4721 	if (unlikely(!p))
4722 		goto out_overflow;
4723 	res->do_recall = be32_to_cpup(p);
4724 
4725 	switch (delegation_type) {
4726 	case NFS4_OPEN_DELEGATE_READ:
4727 		res->delegation_type = FMODE_READ;
4728 		break;
4729 	case NFS4_OPEN_DELEGATE_WRITE:
4730 		res->delegation_type = FMODE_WRITE|FMODE_READ;
4731 		if (decode_space_limit(xdr, &res->maxsize) < 0)
4732 				return -EIO;
4733 	}
4734 	return decode_ace(xdr, NULL, res->server->nfs_client);
4735 out_overflow:
4736 	print_overflow_msg(__func__, xdr);
4737 	return -EIO;
4738 }
4739 
4740 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
4741 {
4742 	__be32 *p;
4743 	uint32_t savewords, bmlen, i;
4744 	int status;
4745 
4746 	status = decode_op_hdr(xdr, OP_OPEN);
4747 	if (status != -EIO)
4748 		nfs_increment_open_seqid(status, res->seqid);
4749 	if (!status)
4750 		status = decode_stateid(xdr, &res->stateid);
4751 	if (unlikely(status))
4752 		return status;
4753 
4754 	decode_change_info(xdr, &res->cinfo);
4755 
4756 	p = xdr_inline_decode(xdr, 8);
4757 	if (unlikely(!p))
4758 		goto out_overflow;
4759 	res->rflags = be32_to_cpup(p++);
4760 	bmlen = be32_to_cpup(p);
4761 	if (bmlen > 10)
4762 		goto xdr_error;
4763 
4764 	p = xdr_inline_decode(xdr, bmlen << 2);
4765 	if (unlikely(!p))
4766 		goto out_overflow;
4767 	savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
4768 	for (i = 0; i < savewords; ++i)
4769 		res->attrset[i] = be32_to_cpup(p++);
4770 	for (; i < NFS4_BITMAP_SIZE; i++)
4771 		res->attrset[i] = 0;
4772 
4773 	return decode_delegation(xdr, res);
4774 xdr_error:
4775 	dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
4776 	return -EIO;
4777 out_overflow:
4778 	print_overflow_msg(__func__, xdr);
4779 	return -EIO;
4780 }
4781 
4782 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
4783 {
4784 	int status;
4785 
4786 	status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
4787 	if (status != -EIO)
4788 		nfs_increment_open_seqid(status, res->seqid);
4789 	if (!status)
4790 		status = decode_stateid(xdr, &res->stateid);
4791 	return status;
4792 }
4793 
4794 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
4795 {
4796 	int status;
4797 
4798 	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
4799 	if (status != -EIO)
4800 		nfs_increment_open_seqid(status, res->seqid);
4801 	if (!status)
4802 		status = decode_stateid(xdr, &res->stateid);
4803 	return status;
4804 }
4805 
4806 static int decode_putfh(struct xdr_stream *xdr)
4807 {
4808 	return decode_op_hdr(xdr, OP_PUTFH);
4809 }
4810 
4811 static int decode_putrootfh(struct xdr_stream *xdr)
4812 {
4813 	return decode_op_hdr(xdr, OP_PUTROOTFH);
4814 }
4815 
4816 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
4817 {
4818 	struct kvec *iov = req->rq_rcv_buf.head;
4819 	__be32 *p;
4820 	uint32_t count, eof, recvd, hdrlen;
4821 	int status;
4822 
4823 	status = decode_op_hdr(xdr, OP_READ);
4824 	if (status)
4825 		return status;
4826 	p = xdr_inline_decode(xdr, 8);
4827 	if (unlikely(!p))
4828 		goto out_overflow;
4829 	eof = be32_to_cpup(p++);
4830 	count = be32_to_cpup(p);
4831 	hdrlen = (u8 *) xdr->p - (u8 *) iov->iov_base;
4832 	recvd = req->rq_rcv_buf.len - hdrlen;
4833 	if (count > recvd) {
4834 		dprintk("NFS: server cheating in read reply: "
4835 				"count %u > recvd %u\n", count, recvd);
4836 		count = recvd;
4837 		eof = 0;
4838 	}
4839 	xdr_read_pages(xdr, count);
4840 	res->eof = eof;
4841 	res->count = count;
4842 	return 0;
4843 out_overflow:
4844 	print_overflow_msg(__func__, xdr);
4845 	return -EIO;
4846 }
4847 
4848 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
4849 {
4850 	struct xdr_buf	*rcvbuf = &req->rq_rcv_buf;
4851 	struct kvec	*iov = rcvbuf->head;
4852 	size_t		hdrlen;
4853 	u32		recvd, pglen = rcvbuf->page_len;
4854 	int		status;
4855 
4856 	status = decode_op_hdr(xdr, OP_READDIR);
4857 	if (!status)
4858 		status = decode_verifier(xdr, readdir->verifier.data);
4859 	if (unlikely(status))
4860 		return status;
4861 	dprintk("%s: verifier = %08x:%08x\n",
4862 			__func__,
4863 			((u32 *)readdir->verifier.data)[0],
4864 			((u32 *)readdir->verifier.data)[1]);
4865 
4866 
4867 	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4868 	recvd = rcvbuf->len - hdrlen;
4869 	if (pglen > recvd)
4870 		pglen = recvd;
4871 	xdr_read_pages(xdr, pglen);
4872 
4873 
4874 	return pglen;
4875 }
4876 
4877 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
4878 {
4879 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
4880 	struct kvec *iov = rcvbuf->head;
4881 	size_t hdrlen;
4882 	u32 len, recvd;
4883 	__be32 *p;
4884 	int status;
4885 
4886 	status = decode_op_hdr(xdr, OP_READLINK);
4887 	if (status)
4888 		return status;
4889 
4890 	/* Convert length of symlink */
4891 	p = xdr_inline_decode(xdr, 4);
4892 	if (unlikely(!p))
4893 		goto out_overflow;
4894 	len = be32_to_cpup(p);
4895 	if (len >= rcvbuf->page_len || len <= 0) {
4896 		dprintk("nfs: server returned giant symlink!\n");
4897 		return -ENAMETOOLONG;
4898 	}
4899 	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
4900 	recvd = req->rq_rcv_buf.len - hdrlen;
4901 	if (recvd < len) {
4902 		dprintk("NFS: server cheating in readlink reply: "
4903 				"count %u > recvd %u\n", len, recvd);
4904 		return -EIO;
4905 	}
4906 	xdr_read_pages(xdr, len);
4907 	/*
4908 	 * The XDR encode routine has set things up so that
4909 	 * the link text will be copied directly into the
4910 	 * buffer.  We just have to do overflow-checking,
4911 	 * and and null-terminate the text (the VFS expects
4912 	 * null-termination).
4913 	 */
4914 	xdr_terminate_string(rcvbuf, len);
4915 	return 0;
4916 out_overflow:
4917 	print_overflow_msg(__func__, xdr);
4918 	return -EIO;
4919 }
4920 
4921 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4922 {
4923 	int status;
4924 
4925 	status = decode_op_hdr(xdr, OP_REMOVE);
4926 	if (status)
4927 		goto out;
4928 	status = decode_change_info(xdr, cinfo);
4929 out:
4930 	return status;
4931 }
4932 
4933 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
4934 	      struct nfs4_change_info *new_cinfo)
4935 {
4936 	int status;
4937 
4938 	status = decode_op_hdr(xdr, OP_RENAME);
4939 	if (status)
4940 		goto out;
4941 	if ((status = decode_change_info(xdr, old_cinfo)))
4942 		goto out;
4943 	status = decode_change_info(xdr, new_cinfo);
4944 out:
4945 	return status;
4946 }
4947 
4948 static int decode_renew(struct xdr_stream *xdr)
4949 {
4950 	return decode_op_hdr(xdr, OP_RENEW);
4951 }
4952 
4953 static int
4954 decode_restorefh(struct xdr_stream *xdr)
4955 {
4956 	return decode_op_hdr(xdr, OP_RESTOREFH);
4957 }
4958 
4959 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
4960 		size_t *acl_len)
4961 {
4962 	__be32 *savep;
4963 	uint32_t attrlen,
4964 		 bitmap[3] = {0};
4965 	struct kvec *iov = req->rq_rcv_buf.head;
4966 	int status;
4967 
4968 	*acl_len = 0;
4969 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4970 		goto out;
4971 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4972 		goto out;
4973 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4974 		goto out;
4975 
4976 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
4977 		return -EIO;
4978 	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
4979 		size_t hdrlen;
4980 		u32 recvd;
4981 
4982 		/* We ignore &savep and don't do consistency checks on
4983 		 * the attr length.  Let userspace figure it out.... */
4984 		hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
4985 		recvd = req->rq_rcv_buf.len - hdrlen;
4986 		if (attrlen > recvd) {
4987 			dprintk("NFS: server cheating in getattr"
4988 					" acl reply: attrlen %u > recvd %u\n",
4989 					attrlen, recvd);
4990 			return -EINVAL;
4991 		}
4992 		xdr_read_pages(xdr, attrlen);
4993 		*acl_len = attrlen;
4994 	} else
4995 		status = -EOPNOTSUPP;
4996 
4997 out:
4998 	return status;
4999 }
5000 
5001 static int
5002 decode_savefh(struct xdr_stream *xdr)
5003 {
5004 	return decode_op_hdr(xdr, OP_SAVEFH);
5005 }
5006 
5007 static int decode_setattr(struct xdr_stream *xdr)
5008 {
5009 	__be32 *p;
5010 	uint32_t bmlen;
5011 	int status;
5012 
5013 	status = decode_op_hdr(xdr, OP_SETATTR);
5014 	if (status)
5015 		return status;
5016 	p = xdr_inline_decode(xdr, 4);
5017 	if (unlikely(!p))
5018 		goto out_overflow;
5019 	bmlen = be32_to_cpup(p);
5020 	p = xdr_inline_decode(xdr, bmlen << 2);
5021 	if (likely(p))
5022 		return 0;
5023 out_overflow:
5024 	print_overflow_msg(__func__, xdr);
5025 	return -EIO;
5026 }
5027 
5028 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5029 {
5030 	__be32 *p;
5031 	uint32_t opnum;
5032 	int32_t nfserr;
5033 
5034 	p = xdr_inline_decode(xdr, 8);
5035 	if (unlikely(!p))
5036 		goto out_overflow;
5037 	opnum = be32_to_cpup(p++);
5038 	if (opnum != OP_SETCLIENTID) {
5039 		dprintk("nfs: decode_setclientid: Server returned operation"
5040 			" %d\n", opnum);
5041 		return -EIO;
5042 	}
5043 	nfserr = be32_to_cpup(p);
5044 	if (nfserr == NFS_OK) {
5045 		p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5046 		if (unlikely(!p))
5047 			goto out_overflow;
5048 		p = xdr_decode_hyper(p, &res->clientid);
5049 		memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5050 	} else if (nfserr == NFSERR_CLID_INUSE) {
5051 		uint32_t len;
5052 
5053 		/* skip netid string */
5054 		p = xdr_inline_decode(xdr, 4);
5055 		if (unlikely(!p))
5056 			goto out_overflow;
5057 		len = be32_to_cpup(p);
5058 		p = xdr_inline_decode(xdr, len);
5059 		if (unlikely(!p))
5060 			goto out_overflow;
5061 
5062 		/* skip uaddr string */
5063 		p = xdr_inline_decode(xdr, 4);
5064 		if (unlikely(!p))
5065 			goto out_overflow;
5066 		len = be32_to_cpup(p);
5067 		p = xdr_inline_decode(xdr, len);
5068 		if (unlikely(!p))
5069 			goto out_overflow;
5070 		return -NFSERR_CLID_INUSE;
5071 	} else
5072 		return nfs4_stat_to_errno(nfserr);
5073 
5074 	return 0;
5075 out_overflow:
5076 	print_overflow_msg(__func__, xdr);
5077 	return -EIO;
5078 }
5079 
5080 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5081 {
5082 	return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5083 }
5084 
5085 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
5086 {
5087 	__be32 *p;
5088 	int status;
5089 
5090 	status = decode_op_hdr(xdr, OP_WRITE);
5091 	if (status)
5092 		return status;
5093 
5094 	p = xdr_inline_decode(xdr, 16);
5095 	if (unlikely(!p))
5096 		goto out_overflow;
5097 	res->count = be32_to_cpup(p++);
5098 	res->verf->committed = be32_to_cpup(p++);
5099 	memcpy(res->verf->verifier, p, 8);
5100 	return 0;
5101 out_overflow:
5102 	print_overflow_msg(__func__, xdr);
5103 	return -EIO;
5104 }
5105 
5106 static int decode_delegreturn(struct xdr_stream *xdr)
5107 {
5108 	return decode_op_hdr(xdr, OP_DELEGRETURN);
5109 }
5110 
5111 static int decode_secinfo_gss(struct xdr_stream *xdr, struct nfs4_secinfo_flavor *flavor)
5112 {
5113 	__be32 *p;
5114 
5115 	p = xdr_inline_decode(xdr, 4);
5116 	if (unlikely(!p))
5117 		goto out_overflow;
5118 	flavor->gss.sec_oid4.len = be32_to_cpup(p);
5119 	if (flavor->gss.sec_oid4.len > GSS_OID_MAX_LEN)
5120 		goto out_err;
5121 
5122 	p = xdr_inline_decode(xdr, flavor->gss.sec_oid4.len);
5123 	if (unlikely(!p))
5124 		goto out_overflow;
5125 	memcpy(flavor->gss.sec_oid4.data, p, flavor->gss.sec_oid4.len);
5126 
5127 	p = xdr_inline_decode(xdr, 8);
5128 	if (unlikely(!p))
5129 		goto out_overflow;
5130 	flavor->gss.qop4 = be32_to_cpup(p++);
5131 	flavor->gss.service = be32_to_cpup(p);
5132 
5133 	return 0;
5134 
5135 out_overflow:
5136 	print_overflow_msg(__func__, xdr);
5137 	return -EIO;
5138 out_err:
5139 	return -EINVAL;
5140 }
5141 
5142 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5143 {
5144 	struct nfs4_secinfo_flavor *sec_flavor;
5145 	int status;
5146 	__be32 *p;
5147 	int i, num_flavors;
5148 
5149 	status = decode_op_hdr(xdr, OP_SECINFO);
5150 	if (status)
5151 		goto out;
5152 	p = xdr_inline_decode(xdr, 4);
5153 	if (unlikely(!p))
5154 		goto out_overflow;
5155 
5156 	res->flavors->num_flavors = 0;
5157 	num_flavors = be32_to_cpup(p);
5158 
5159 	for (i = 0; i < num_flavors; i++) {
5160 		sec_flavor = &res->flavors->flavors[i];
5161 		if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5162 			break;
5163 
5164 		p = xdr_inline_decode(xdr, 4);
5165 		if (unlikely(!p))
5166 			goto out_overflow;
5167 		sec_flavor->flavor = be32_to_cpup(p);
5168 
5169 		if (sec_flavor->flavor == RPC_AUTH_GSS) {
5170 			status = decode_secinfo_gss(xdr, sec_flavor);
5171 			if (status)
5172 				goto out;
5173 		}
5174 		res->flavors->num_flavors++;
5175 	}
5176 
5177 out:
5178 	return status;
5179 out_overflow:
5180 	print_overflow_msg(__func__, xdr);
5181 	return -EIO;
5182 }
5183 
5184 #if defined(CONFIG_NFS_V4_1)
5185 static int decode_exchange_id(struct xdr_stream *xdr,
5186 			      struct nfs41_exchange_id_res *res)
5187 {
5188 	__be32 *p;
5189 	uint32_t dummy;
5190 	char *dummy_str;
5191 	int status;
5192 	struct nfs_client *clp = res->client;
5193 
5194 	status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5195 	if (status)
5196 		return status;
5197 
5198 	p = xdr_inline_decode(xdr, 8);
5199 	if (unlikely(!p))
5200 		goto out_overflow;
5201 	xdr_decode_hyper(p, &clp->cl_clientid);
5202 	p = xdr_inline_decode(xdr, 12);
5203 	if (unlikely(!p))
5204 		goto out_overflow;
5205 	clp->cl_seqid = be32_to_cpup(p++);
5206 	clp->cl_exchange_flags = be32_to_cpup(p++);
5207 
5208 	/* We ask for SP4_NONE */
5209 	dummy = be32_to_cpup(p);
5210 	if (dummy != SP4_NONE)
5211 		return -EIO;
5212 
5213 	/* Throw away minor_id */
5214 	p = xdr_inline_decode(xdr, 8);
5215 	if (unlikely(!p))
5216 		goto out_overflow;
5217 
5218 	/* Throw away Major id */
5219 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5220 	if (unlikely(status))
5221 		return status;
5222 
5223 	/* Save server_scope */
5224 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5225 	if (unlikely(status))
5226 		return status;
5227 
5228 	if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5229 		return -EIO;
5230 
5231 	memcpy(res->server_scope->server_scope, dummy_str, dummy);
5232 	res->server_scope->server_scope_sz = dummy;
5233 
5234 	/* Throw away Implementation id array */
5235 	status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5236 	if (unlikely(status))
5237 		return status;
5238 
5239 	return 0;
5240 out_overflow:
5241 	print_overflow_msg(__func__, xdr);
5242 	return -EIO;
5243 }
5244 
5245 static int decode_chan_attrs(struct xdr_stream *xdr,
5246 			     struct nfs4_channel_attrs *attrs)
5247 {
5248 	__be32 *p;
5249 	u32 nr_attrs, val;
5250 
5251 	p = xdr_inline_decode(xdr, 28);
5252 	if (unlikely(!p))
5253 		goto out_overflow;
5254 	val = be32_to_cpup(p++);	/* headerpadsz */
5255 	if (val)
5256 		return -EINVAL;		/* no support for header padding yet */
5257 	attrs->max_rqst_sz = be32_to_cpup(p++);
5258 	attrs->max_resp_sz = be32_to_cpup(p++);
5259 	attrs->max_resp_sz_cached = be32_to_cpup(p++);
5260 	attrs->max_ops = be32_to_cpup(p++);
5261 	attrs->max_reqs = be32_to_cpup(p++);
5262 	nr_attrs = be32_to_cpup(p);
5263 	if (unlikely(nr_attrs > 1)) {
5264 		printk(KERN_WARNING "%s: Invalid rdma channel attrs count %u\n",
5265 			__func__, nr_attrs);
5266 		return -EINVAL;
5267 	}
5268 	if (nr_attrs == 1) {
5269 		p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5270 		if (unlikely(!p))
5271 			goto out_overflow;
5272 	}
5273 	return 0;
5274 out_overflow:
5275 	print_overflow_msg(__func__, xdr);
5276 	return -EIO;
5277 }
5278 
5279 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5280 {
5281 	return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5282 }
5283 
5284 static int decode_create_session(struct xdr_stream *xdr,
5285 				 struct nfs41_create_session_res *res)
5286 {
5287 	__be32 *p;
5288 	int status;
5289 	struct nfs_client *clp = res->client;
5290 	struct nfs4_session *session = clp->cl_session;
5291 
5292 	status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5293 	if (!status)
5294 		status = decode_sessionid(xdr, &session->sess_id);
5295 	if (unlikely(status))
5296 		return status;
5297 
5298 	/* seqid, flags */
5299 	p = xdr_inline_decode(xdr, 8);
5300 	if (unlikely(!p))
5301 		goto out_overflow;
5302 	clp->cl_seqid = be32_to_cpup(p++);
5303 	session->flags = be32_to_cpup(p);
5304 
5305 	/* Channel attributes */
5306 	status = decode_chan_attrs(xdr, &session->fc_attrs);
5307 	if (!status)
5308 		status = decode_chan_attrs(xdr, &session->bc_attrs);
5309 	return status;
5310 out_overflow:
5311 	print_overflow_msg(__func__, xdr);
5312 	return -EIO;
5313 }
5314 
5315 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5316 {
5317 	return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5318 }
5319 
5320 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5321 {
5322 	return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5323 }
5324 #endif /* CONFIG_NFS_V4_1 */
5325 
5326 static int decode_sequence(struct xdr_stream *xdr,
5327 			   struct nfs4_sequence_res *res,
5328 			   struct rpc_rqst *rqstp)
5329 {
5330 #if defined(CONFIG_NFS_V4_1)
5331 	struct nfs4_sessionid id;
5332 	u32 dummy;
5333 	int status;
5334 	__be32 *p;
5335 
5336 	if (!res->sr_session)
5337 		return 0;
5338 
5339 	status = decode_op_hdr(xdr, OP_SEQUENCE);
5340 	if (!status)
5341 		status = decode_sessionid(xdr, &id);
5342 	if (unlikely(status))
5343 		goto out_err;
5344 
5345 	/*
5346 	 * If the server returns different values for sessionID, slotID or
5347 	 * sequence number, the server is looney tunes.
5348 	 */
5349 	status = -EREMOTEIO;
5350 
5351 	if (memcmp(id.data, res->sr_session->sess_id.data,
5352 		   NFS4_MAX_SESSIONID_LEN)) {
5353 		dprintk("%s Invalid session id\n", __func__);
5354 		goto out_err;
5355 	}
5356 
5357 	p = xdr_inline_decode(xdr, 20);
5358 	if (unlikely(!p))
5359 		goto out_overflow;
5360 
5361 	/* seqid */
5362 	dummy = be32_to_cpup(p++);
5363 	if (dummy != res->sr_slot->seq_nr) {
5364 		dprintk("%s Invalid sequence number\n", __func__);
5365 		goto out_err;
5366 	}
5367 	/* slot id */
5368 	dummy = be32_to_cpup(p++);
5369 	if (dummy != res->sr_slot - res->sr_session->fc_slot_table.slots) {
5370 		dprintk("%s Invalid slot id\n", __func__);
5371 		goto out_err;
5372 	}
5373 	/* highest slot id - currently not processed */
5374 	dummy = be32_to_cpup(p++);
5375 	/* target highest slot id - currently not processed */
5376 	dummy = be32_to_cpup(p++);
5377 	/* result flags */
5378 	res->sr_status_flags = be32_to_cpup(p);
5379 	status = 0;
5380 out_err:
5381 	res->sr_status = status;
5382 	return status;
5383 out_overflow:
5384 	print_overflow_msg(__func__, xdr);
5385 	status = -EIO;
5386 	goto out_err;
5387 #else  /* CONFIG_NFS_V4_1 */
5388 	return 0;
5389 #endif /* CONFIG_NFS_V4_1 */
5390 }
5391 
5392 #if defined(CONFIG_NFS_V4_1)
5393 /*
5394  * TODO: Need to handle case when EOF != true;
5395  */
5396 static int decode_getdevicelist(struct xdr_stream *xdr,
5397 				struct pnfs_devicelist *res)
5398 {
5399 	__be32 *p;
5400 	int status, i;
5401 	struct nfs_writeverf verftemp;
5402 
5403 	status = decode_op_hdr(xdr, OP_GETDEVICELIST);
5404 	if (status)
5405 		return status;
5406 
5407 	p = xdr_inline_decode(xdr, 8 + 8 + 4);
5408 	if (unlikely(!p))
5409 		goto out_overflow;
5410 
5411 	/* TODO: Skip cookie for now */
5412 	p += 2;
5413 
5414 	/* Read verifier */
5415 	p = xdr_decode_opaque_fixed(p, verftemp.verifier, 8);
5416 
5417 	res->num_devs = be32_to_cpup(p);
5418 
5419 	dprintk("%s: num_dev %d\n", __func__, res->num_devs);
5420 
5421 	if (res->num_devs > NFS4_PNFS_GETDEVLIST_MAXNUM) {
5422 		printk(KERN_ERR "%s too many result dev_num %u\n",
5423 				__func__, res->num_devs);
5424 		return -EIO;
5425 	}
5426 
5427 	p = xdr_inline_decode(xdr,
5428 			      res->num_devs * NFS4_DEVICEID4_SIZE + 4);
5429 	if (unlikely(!p))
5430 		goto out_overflow;
5431 	for (i = 0; i < res->num_devs; i++)
5432 		p = xdr_decode_opaque_fixed(p, res->dev_id[i].data,
5433 					    NFS4_DEVICEID4_SIZE);
5434 	res->eof = be32_to_cpup(p);
5435 	return 0;
5436 out_overflow:
5437 	print_overflow_msg(__func__, xdr);
5438 	return -EIO;
5439 }
5440 
5441 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5442 				struct pnfs_device *pdev)
5443 {
5444 	__be32 *p;
5445 	uint32_t len, type;
5446 	int status;
5447 
5448 	status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5449 	if (status) {
5450 		if (status == -ETOOSMALL) {
5451 			p = xdr_inline_decode(xdr, 4);
5452 			if (unlikely(!p))
5453 				goto out_overflow;
5454 			pdev->mincount = be32_to_cpup(p);
5455 			dprintk("%s: Min count too small. mincnt = %u\n",
5456 				__func__, pdev->mincount);
5457 		}
5458 		return status;
5459 	}
5460 
5461 	p = xdr_inline_decode(xdr, 8);
5462 	if (unlikely(!p))
5463 		goto out_overflow;
5464 	type = be32_to_cpup(p++);
5465 	if (type != pdev->layout_type) {
5466 		dprintk("%s: layout mismatch req: %u pdev: %u\n",
5467 			__func__, pdev->layout_type, type);
5468 		return -EINVAL;
5469 	}
5470 	/*
5471 	 * Get the length of the opaque device_addr4. xdr_read_pages places
5472 	 * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5473 	 * and places the remaining xdr data in xdr_buf->tail
5474 	 */
5475 	pdev->mincount = be32_to_cpup(p);
5476 	xdr_read_pages(xdr, pdev->mincount); /* include space for the length */
5477 
5478 	/* Parse notification bitmap, verifying that it is zero. */
5479 	p = xdr_inline_decode(xdr, 4);
5480 	if (unlikely(!p))
5481 		goto out_overflow;
5482 	len = be32_to_cpup(p);
5483 	if (len) {
5484 		uint32_t i;
5485 
5486 		p = xdr_inline_decode(xdr, 4 * len);
5487 		if (unlikely(!p))
5488 			goto out_overflow;
5489 		for (i = 0; i < len; i++, p++) {
5490 			if (be32_to_cpup(p)) {
5491 				dprintk("%s: notifications not supported\n",
5492 					__func__);
5493 				return -EIO;
5494 			}
5495 		}
5496 	}
5497 	return 0;
5498 out_overflow:
5499 	print_overflow_msg(__func__, xdr);
5500 	return -EIO;
5501 }
5502 
5503 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5504 			    struct nfs4_layoutget_res *res)
5505 {
5506 	__be32 *p;
5507 	int status;
5508 	u32 layout_count;
5509 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5510 	struct kvec *iov = rcvbuf->head;
5511 	u32 hdrlen, recvd;
5512 
5513 	status = decode_op_hdr(xdr, OP_LAYOUTGET);
5514 	if (status)
5515 		return status;
5516 	p = xdr_inline_decode(xdr, 8 + NFS4_STATEID_SIZE);
5517 	if (unlikely(!p))
5518 		goto out_overflow;
5519 	res->return_on_close = be32_to_cpup(p++);
5520 	p = xdr_decode_opaque_fixed(p, res->stateid.data, NFS4_STATEID_SIZE);
5521 	layout_count = be32_to_cpup(p);
5522 	if (!layout_count) {
5523 		dprintk("%s: server responded with empty layout array\n",
5524 			__func__);
5525 		return -EINVAL;
5526 	}
5527 
5528 	p = xdr_inline_decode(xdr, 28);
5529 	if (unlikely(!p))
5530 		goto out_overflow;
5531 	p = xdr_decode_hyper(p, &res->range.offset);
5532 	p = xdr_decode_hyper(p, &res->range.length);
5533 	res->range.iomode = be32_to_cpup(p++);
5534 	res->type = be32_to_cpup(p++);
5535 	res->layoutp->len = be32_to_cpup(p);
5536 
5537 	dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
5538 		__func__,
5539 		(unsigned long)res->range.offset,
5540 		(unsigned long)res->range.length,
5541 		res->range.iomode,
5542 		res->type,
5543 		res->layoutp->len);
5544 
5545 	hdrlen = (u8 *) xdr->p - (u8 *) iov->iov_base;
5546 	recvd = req->rq_rcv_buf.len - hdrlen;
5547 	if (res->layoutp->len > recvd) {
5548 		dprintk("NFS: server cheating in layoutget reply: "
5549 				"layout len %u > recvd %u\n",
5550 				res->layoutp->len, recvd);
5551 		return -EINVAL;
5552 	}
5553 
5554 	xdr_read_pages(xdr, res->layoutp->len);
5555 
5556 	if (layout_count > 1) {
5557 		/* We only handle a length one array at the moment.  Any
5558 		 * further entries are just ignored.  Note that this means
5559 		 * the client may see a response that is less than the
5560 		 * minimum it requested.
5561 		 */
5562 		dprintk("%s: server responded with %d layouts, dropping tail\n",
5563 			__func__, layout_count);
5564 	}
5565 
5566 	return 0;
5567 out_overflow:
5568 	print_overflow_msg(__func__, xdr);
5569 	return -EIO;
5570 }
5571 
5572 static int decode_layoutreturn(struct xdr_stream *xdr,
5573 			       struct nfs4_layoutreturn_res *res)
5574 {
5575 	__be32 *p;
5576 	int status;
5577 
5578 	status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
5579 	if (status)
5580 		return status;
5581 	p = xdr_inline_decode(xdr, 4);
5582 	if (unlikely(!p))
5583 		goto out_overflow;
5584 	res->lrs_present = be32_to_cpup(p);
5585 	if (res->lrs_present)
5586 		status = decode_stateid(xdr, &res->stateid);
5587 	return status;
5588 out_overflow:
5589 	print_overflow_msg(__func__, xdr);
5590 	return -EIO;
5591 }
5592 
5593 static int decode_layoutcommit(struct xdr_stream *xdr,
5594 			       struct rpc_rqst *req,
5595 			       struct nfs4_layoutcommit_res *res)
5596 {
5597 	__be32 *p;
5598 	__u32 sizechanged;
5599 	int status;
5600 
5601 	status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
5602 	res->status = status;
5603 	if (status)
5604 		return status;
5605 
5606 	p = xdr_inline_decode(xdr, 4);
5607 	if (unlikely(!p))
5608 		goto out_overflow;
5609 	sizechanged = be32_to_cpup(p);
5610 
5611 	if (sizechanged) {
5612 		/* throw away new size */
5613 		p = xdr_inline_decode(xdr, 8);
5614 		if (unlikely(!p))
5615 			goto out_overflow;
5616 	}
5617 	return 0;
5618 out_overflow:
5619 	print_overflow_msg(__func__, xdr);
5620 	return -EIO;
5621 }
5622 
5623 static int decode_test_stateid(struct xdr_stream *xdr,
5624 			       struct nfs41_test_stateid_res *res)
5625 {
5626 	__be32 *p;
5627 	int status;
5628 	int num_res;
5629 
5630 	status = decode_op_hdr(xdr, OP_TEST_STATEID);
5631 	if (status)
5632 		return status;
5633 
5634 	p = xdr_inline_decode(xdr, 4);
5635 	if (unlikely(!p))
5636 		goto out_overflow;
5637 	num_res = be32_to_cpup(p++);
5638 	if (num_res != 1)
5639 		goto out;
5640 
5641 	p = xdr_inline_decode(xdr, 4);
5642 	if (unlikely(!p))
5643 		goto out_overflow;
5644 	res->status = be32_to_cpup(p++);
5645 	return res->status;
5646 out_overflow:
5647 	print_overflow_msg(__func__, xdr);
5648 out:
5649 	return -EIO;
5650 }
5651 
5652 static int decode_free_stateid(struct xdr_stream *xdr,
5653 			       struct nfs41_free_stateid_res *res)
5654 {
5655 	__be32 *p;
5656 	int status;
5657 
5658 	status = decode_op_hdr(xdr, OP_FREE_STATEID);
5659 	if (status)
5660 		return status;
5661 
5662 	p = xdr_inline_decode(xdr, 4);
5663 	if (unlikely(!p))
5664 		goto out_overflow;
5665 	res->status = be32_to_cpup(p++);
5666 	return res->status;
5667 out_overflow:
5668 	print_overflow_msg(__func__, xdr);
5669 	return -EIO;
5670 }
5671 #endif /* CONFIG_NFS_V4_1 */
5672 
5673 /*
5674  * END OF "GENERIC" DECODE ROUTINES.
5675  */
5676 
5677 /*
5678  * Decode OPEN_DOWNGRADE response
5679  */
5680 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
5681 				       struct xdr_stream *xdr,
5682 				       struct nfs_closeres *res)
5683 {
5684 	struct compound_hdr hdr;
5685 	int status;
5686 
5687 	status = decode_compound_hdr(xdr, &hdr);
5688 	if (status)
5689 		goto out;
5690 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5691 	if (status)
5692 		goto out;
5693 	status = decode_putfh(xdr);
5694 	if (status)
5695 		goto out;
5696 	status = decode_open_downgrade(xdr, res);
5697 	if (status != 0)
5698 		goto out;
5699 	decode_getfattr(xdr, res->fattr, res->server,
5700 			!RPC_IS_ASYNC(rqstp->rq_task));
5701 out:
5702 	return status;
5703 }
5704 
5705 /*
5706  * Decode ACCESS response
5707  */
5708 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5709 			       struct nfs4_accessres *res)
5710 {
5711 	struct compound_hdr hdr;
5712 	int status;
5713 
5714 	status = decode_compound_hdr(xdr, &hdr);
5715 	if (status)
5716 		goto out;
5717 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5718 	if (status)
5719 		goto out;
5720 	status = decode_putfh(xdr);
5721 	if (status != 0)
5722 		goto out;
5723 	status = decode_access(xdr, res);
5724 	if (status != 0)
5725 		goto out;
5726 	decode_getfattr(xdr, res->fattr, res->server,
5727 			!RPC_IS_ASYNC(rqstp->rq_task));
5728 out:
5729 	return status;
5730 }
5731 
5732 /*
5733  * Decode LOOKUP response
5734  */
5735 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5736 			       struct nfs4_lookup_res *res)
5737 {
5738 	struct compound_hdr hdr;
5739 	int status;
5740 
5741 	status = decode_compound_hdr(xdr, &hdr);
5742 	if (status)
5743 		goto out;
5744 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5745 	if (status)
5746 		goto out;
5747 	status = decode_putfh(xdr);
5748 	if (status)
5749 		goto out;
5750 	status = decode_lookup(xdr);
5751 	if (status)
5752 		goto out;
5753 	status = decode_getfh(xdr, res->fh);
5754 	if (status)
5755 		goto out;
5756 	status = decode_getfattr(xdr, res->fattr, res->server
5757 			,!RPC_IS_ASYNC(rqstp->rq_task));
5758 out:
5759 	return status;
5760 }
5761 
5762 /*
5763  * Decode LOOKUP_ROOT response
5764  */
5765 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
5766 				    struct xdr_stream *xdr,
5767 				    struct nfs4_lookup_res *res)
5768 {
5769 	struct compound_hdr hdr;
5770 	int status;
5771 
5772 	status = decode_compound_hdr(xdr, &hdr);
5773 	if (status)
5774 		goto out;
5775 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5776 	if (status)
5777 		goto out;
5778 	status = decode_putrootfh(xdr);
5779 	if (status)
5780 		goto out;
5781 	status = decode_getfh(xdr, res->fh);
5782 	if (status == 0)
5783 		status = decode_getfattr(xdr, res->fattr, res->server,
5784 				!RPC_IS_ASYNC(rqstp->rq_task));
5785 out:
5786 	return status;
5787 }
5788 
5789 /*
5790  * Decode REMOVE response
5791  */
5792 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5793 			       struct nfs_removeres *res)
5794 {
5795 	struct compound_hdr hdr;
5796 	int status;
5797 
5798 	status = decode_compound_hdr(xdr, &hdr);
5799 	if (status)
5800 		goto out;
5801 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5802 	if (status)
5803 		goto out;
5804 	status = decode_putfh(xdr);
5805 	if (status)
5806 		goto out;
5807 	status = decode_remove(xdr, &res->cinfo);
5808 	if (status)
5809 		goto out;
5810 	decode_getfattr(xdr, res->dir_attr, res->server,
5811 			!RPC_IS_ASYNC(rqstp->rq_task));
5812 out:
5813 	return status;
5814 }
5815 
5816 /*
5817  * Decode RENAME response
5818  */
5819 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5820 			       struct nfs_renameres *res)
5821 {
5822 	struct compound_hdr hdr;
5823 	int status;
5824 
5825 	status = decode_compound_hdr(xdr, &hdr);
5826 	if (status)
5827 		goto out;
5828 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5829 	if (status)
5830 		goto out;
5831 	status = decode_putfh(xdr);
5832 	if (status)
5833 		goto out;
5834 	status = decode_savefh(xdr);
5835 	if (status)
5836 		goto out;
5837 	status = decode_putfh(xdr);
5838 	if (status)
5839 		goto out;
5840 	status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
5841 	if (status)
5842 		goto out;
5843 	/* Current FH is target directory */
5844 	if (decode_getfattr(xdr, res->new_fattr, res->server,
5845 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5846 		goto out;
5847 	status = decode_restorefh(xdr);
5848 	if (status)
5849 		goto out;
5850 	decode_getfattr(xdr, res->old_fattr, res->server,
5851 			!RPC_IS_ASYNC(rqstp->rq_task));
5852 out:
5853 	return status;
5854 }
5855 
5856 /*
5857  * Decode LINK response
5858  */
5859 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5860 			     struct nfs4_link_res *res)
5861 {
5862 	struct compound_hdr hdr;
5863 	int status;
5864 
5865 	status = decode_compound_hdr(xdr, &hdr);
5866 	if (status)
5867 		goto out;
5868 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5869 	if (status)
5870 		goto out;
5871 	status = decode_putfh(xdr);
5872 	if (status)
5873 		goto out;
5874 	status = decode_savefh(xdr);
5875 	if (status)
5876 		goto out;
5877 	status = decode_putfh(xdr);
5878 	if (status)
5879 		goto out;
5880 	status = decode_link(xdr, &res->cinfo);
5881 	if (status)
5882 		goto out;
5883 	/*
5884 	 * Note order: OP_LINK leaves the directory as the current
5885 	 *             filehandle.
5886 	 */
5887 	if (decode_getfattr(xdr, res->dir_attr, res->server,
5888 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5889 		goto out;
5890 	status = decode_restorefh(xdr);
5891 	if (status)
5892 		goto out;
5893 	decode_getfattr(xdr, res->fattr, res->server,
5894 			!RPC_IS_ASYNC(rqstp->rq_task));
5895 out:
5896 	return status;
5897 }
5898 
5899 /*
5900  * Decode CREATE response
5901  */
5902 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5903 			       struct nfs4_create_res *res)
5904 {
5905 	struct compound_hdr hdr;
5906 	int status;
5907 
5908 	status = decode_compound_hdr(xdr, &hdr);
5909 	if (status)
5910 		goto out;
5911 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5912 	if (status)
5913 		goto out;
5914 	status = decode_putfh(xdr);
5915 	if (status)
5916 		goto out;
5917 	status = decode_savefh(xdr);
5918 	if (status)
5919 		goto out;
5920 	status = decode_create(xdr, &res->dir_cinfo);
5921 	if (status)
5922 		goto out;
5923 	status = decode_getfh(xdr, res->fh);
5924 	if (status)
5925 		goto out;
5926 	if (decode_getfattr(xdr, res->fattr, res->server,
5927 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
5928 		goto out;
5929 	status = decode_restorefh(xdr);
5930 	if (status)
5931 		goto out;
5932 	decode_getfattr(xdr, res->dir_fattr, res->server,
5933 			!RPC_IS_ASYNC(rqstp->rq_task));
5934 out:
5935 	return status;
5936 }
5937 
5938 /*
5939  * Decode SYMLINK response
5940  */
5941 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5942 				struct nfs4_create_res *res)
5943 {
5944 	return nfs4_xdr_dec_create(rqstp, xdr, res);
5945 }
5946 
5947 /*
5948  * Decode GETATTR response
5949  */
5950 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5951 				struct nfs4_getattr_res *res)
5952 {
5953 	struct compound_hdr hdr;
5954 	int status;
5955 
5956 	status = decode_compound_hdr(xdr, &hdr);
5957 	if (status)
5958 		goto out;
5959 	status = decode_sequence(xdr, &res->seq_res, rqstp);
5960 	if (status)
5961 		goto out;
5962 	status = decode_putfh(xdr);
5963 	if (status)
5964 		goto out;
5965 	status = decode_getfattr(xdr, res->fattr, res->server,
5966 			!RPC_IS_ASYNC(rqstp->rq_task));
5967 out:
5968 	return status;
5969 }
5970 
5971 /*
5972  * Encode an SETACL request
5973  */
5974 static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
5975 				struct nfs_setaclargs *args)
5976 {
5977 	struct compound_hdr hdr = {
5978 		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
5979 	};
5980 
5981 	encode_compound_hdr(xdr, req, &hdr);
5982 	encode_sequence(xdr, &args->seq_args, &hdr);
5983 	encode_putfh(xdr, args->fh, &hdr);
5984 	encode_setacl(xdr, args, &hdr);
5985 	encode_nops(&hdr);
5986 }
5987 
5988 /*
5989  * Decode SETACL response
5990  */
5991 static int
5992 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
5993 		    struct nfs_setaclres *res)
5994 {
5995 	struct compound_hdr hdr;
5996 	int status;
5997 
5998 	status = decode_compound_hdr(xdr, &hdr);
5999 	if (status)
6000 		goto out;
6001 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6002 	if (status)
6003 		goto out;
6004 	status = decode_putfh(xdr);
6005 	if (status)
6006 		goto out;
6007 	status = decode_setattr(xdr);
6008 out:
6009 	return status;
6010 }
6011 
6012 /*
6013  * Decode GETACL response
6014  */
6015 static int
6016 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6017 		    struct nfs_getaclres *res)
6018 {
6019 	struct compound_hdr hdr;
6020 	int status;
6021 
6022 	status = decode_compound_hdr(xdr, &hdr);
6023 	if (status)
6024 		goto out;
6025 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6026 	if (status)
6027 		goto out;
6028 	status = decode_putfh(xdr);
6029 	if (status)
6030 		goto out;
6031 	status = decode_getacl(xdr, rqstp, &res->acl_len);
6032 
6033 out:
6034 	return status;
6035 }
6036 
6037 /*
6038  * Decode CLOSE response
6039  */
6040 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6041 			      struct nfs_closeres *res)
6042 {
6043 	struct compound_hdr hdr;
6044 	int status;
6045 
6046 	status = decode_compound_hdr(xdr, &hdr);
6047 	if (status)
6048 		goto out;
6049 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6050 	if (status)
6051 		goto out;
6052 	status = decode_putfh(xdr);
6053 	if (status)
6054 		goto out;
6055 	status = decode_close(xdr, res);
6056 	if (status != 0)
6057 		goto out;
6058 	/*
6059 	 * Note: Server may do delete on close for this file
6060 	 * 	in which case the getattr call will fail with
6061 	 * 	an ESTALE error. Shouldn't be a problem,
6062 	 * 	though, since fattr->valid will remain unset.
6063 	 */
6064 	decode_getfattr(xdr, res->fattr, res->server,
6065 			!RPC_IS_ASYNC(rqstp->rq_task));
6066 out:
6067 	return status;
6068 }
6069 
6070 /*
6071  * Decode OPEN response
6072  */
6073 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6074 			     struct nfs_openres *res)
6075 {
6076 	struct compound_hdr hdr;
6077 	int status;
6078 
6079 	status = decode_compound_hdr(xdr, &hdr);
6080 	if (status)
6081 		goto out;
6082 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6083 	if (status)
6084 		goto out;
6085 	status = decode_putfh(xdr);
6086 	if (status)
6087 		goto out;
6088 	status = decode_savefh(xdr);
6089 	if (status)
6090 		goto out;
6091 	status = decode_open(xdr, res);
6092 	if (status)
6093 		goto out;
6094 	if (decode_getfh(xdr, &res->fh) != 0)
6095 		goto out;
6096 	if (decode_getfattr(xdr, res->f_attr, res->server,
6097 				!RPC_IS_ASYNC(rqstp->rq_task)) != 0)
6098 		goto out;
6099 	if (decode_restorefh(xdr) != 0)
6100 		goto out;
6101 	decode_getfattr(xdr, res->dir_attr, res->server,
6102 			!RPC_IS_ASYNC(rqstp->rq_task));
6103 out:
6104 	return status;
6105 }
6106 
6107 /*
6108  * Decode OPEN_CONFIRM response
6109  */
6110 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
6111 				     struct xdr_stream *xdr,
6112 				     struct nfs_open_confirmres *res)
6113 {
6114 	struct compound_hdr hdr;
6115 	int status;
6116 
6117 	status = decode_compound_hdr(xdr, &hdr);
6118 	if (status)
6119 		goto out;
6120 	status = decode_putfh(xdr);
6121 	if (status)
6122 		goto out;
6123 	status = decode_open_confirm(xdr, res);
6124 out:
6125 	return status;
6126 }
6127 
6128 /*
6129  * Decode OPEN response
6130  */
6131 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
6132 				    struct xdr_stream *xdr,
6133 				    struct nfs_openres *res)
6134 {
6135 	struct compound_hdr hdr;
6136 	int status;
6137 
6138 	status = decode_compound_hdr(xdr, &hdr);
6139 	if (status)
6140 		goto out;
6141 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6142 	if (status)
6143 		goto out;
6144 	status = decode_putfh(xdr);
6145 	if (status)
6146 		goto out;
6147 	status = decode_open(xdr, res);
6148 	if (status)
6149 		goto out;
6150 	decode_getfattr(xdr, res->f_attr, res->server,
6151 			!RPC_IS_ASYNC(rqstp->rq_task));
6152 out:
6153 	return status;
6154 }
6155 
6156 /*
6157  * Decode SETATTR response
6158  */
6159 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
6160 				struct xdr_stream *xdr,
6161 				struct nfs_setattrres *res)
6162 {
6163 	struct compound_hdr hdr;
6164 	int status;
6165 
6166 	status = decode_compound_hdr(xdr, &hdr);
6167 	if (status)
6168 		goto out;
6169 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6170 	if (status)
6171 		goto out;
6172 	status = decode_putfh(xdr);
6173 	if (status)
6174 		goto out;
6175 	status = decode_setattr(xdr);
6176 	if (status)
6177 		goto out;
6178 	decode_getfattr(xdr, res->fattr, res->server,
6179 			!RPC_IS_ASYNC(rqstp->rq_task));
6180 out:
6181 	return status;
6182 }
6183 
6184 /*
6185  * Decode LOCK response
6186  */
6187 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6188 			     struct nfs_lock_res *res)
6189 {
6190 	struct compound_hdr hdr;
6191 	int status;
6192 
6193 	status = decode_compound_hdr(xdr, &hdr);
6194 	if (status)
6195 		goto out;
6196 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6197 	if (status)
6198 		goto out;
6199 	status = decode_putfh(xdr);
6200 	if (status)
6201 		goto out;
6202 	status = decode_lock(xdr, res);
6203 out:
6204 	return status;
6205 }
6206 
6207 /*
6208  * Decode LOCKT response
6209  */
6210 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6211 			      struct nfs_lockt_res *res)
6212 {
6213 	struct compound_hdr hdr;
6214 	int status;
6215 
6216 	status = decode_compound_hdr(xdr, &hdr);
6217 	if (status)
6218 		goto out;
6219 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6220 	if (status)
6221 		goto out;
6222 	status = decode_putfh(xdr);
6223 	if (status)
6224 		goto out;
6225 	status = decode_lockt(xdr, res);
6226 out:
6227 	return status;
6228 }
6229 
6230 /*
6231  * Decode LOCKU response
6232  */
6233 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6234 			      struct nfs_locku_res *res)
6235 {
6236 	struct compound_hdr hdr;
6237 	int status;
6238 
6239 	status = decode_compound_hdr(xdr, &hdr);
6240 	if (status)
6241 		goto out;
6242 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6243 	if (status)
6244 		goto out;
6245 	status = decode_putfh(xdr);
6246 	if (status)
6247 		goto out;
6248 	status = decode_locku(xdr, res);
6249 out:
6250 	return status;
6251 }
6252 
6253 static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
6254 					  struct xdr_stream *xdr, void *dummy)
6255 {
6256 	struct compound_hdr hdr;
6257 	int status;
6258 
6259 	status = decode_compound_hdr(xdr, &hdr);
6260 	if (!status)
6261 		status = decode_release_lockowner(xdr);
6262 	return status;
6263 }
6264 
6265 /*
6266  * Decode READLINK response
6267  */
6268 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
6269 				 struct xdr_stream *xdr,
6270 				 struct nfs4_readlink_res *res)
6271 {
6272 	struct compound_hdr hdr;
6273 	int status;
6274 
6275 	status = decode_compound_hdr(xdr, &hdr);
6276 	if (status)
6277 		goto out;
6278 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6279 	if (status)
6280 		goto out;
6281 	status = decode_putfh(xdr);
6282 	if (status)
6283 		goto out;
6284 	status = decode_readlink(xdr, rqstp);
6285 out:
6286 	return status;
6287 }
6288 
6289 /*
6290  * Decode READDIR response
6291  */
6292 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6293 				struct nfs4_readdir_res *res)
6294 {
6295 	struct compound_hdr hdr;
6296 	int status;
6297 
6298 	status = decode_compound_hdr(xdr, &hdr);
6299 	if (status)
6300 		goto out;
6301 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6302 	if (status)
6303 		goto out;
6304 	status = decode_putfh(xdr);
6305 	if (status)
6306 		goto out;
6307 	status = decode_readdir(xdr, rqstp, res);
6308 out:
6309 	return status;
6310 }
6311 
6312 /*
6313  * Decode Read response
6314  */
6315 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6316 			     struct nfs_readres *res)
6317 {
6318 	struct compound_hdr hdr;
6319 	int status;
6320 
6321 	status = decode_compound_hdr(xdr, &hdr);
6322 	if (status)
6323 		goto out;
6324 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6325 	if (status)
6326 		goto out;
6327 	status = decode_putfh(xdr);
6328 	if (status)
6329 		goto out;
6330 	status = decode_read(xdr, rqstp, res);
6331 	if (!status)
6332 		status = res->count;
6333 out:
6334 	return status;
6335 }
6336 
6337 /*
6338  * Decode WRITE response
6339  */
6340 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6341 			      struct nfs_writeres *res)
6342 {
6343 	struct compound_hdr hdr;
6344 	int status;
6345 
6346 	status = decode_compound_hdr(xdr, &hdr);
6347 	if (status)
6348 		goto out;
6349 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6350 	if (status)
6351 		goto out;
6352 	status = decode_putfh(xdr);
6353 	if (status)
6354 		goto out;
6355 	status = decode_write(xdr, res);
6356 	if (status)
6357 		goto out;
6358 	if (res->fattr)
6359 		decode_getfattr(xdr, res->fattr, res->server,
6360 				!RPC_IS_ASYNC(rqstp->rq_task));
6361 	if (!status)
6362 		status = res->count;
6363 out:
6364 	return status;
6365 }
6366 
6367 /*
6368  * Decode COMMIT response
6369  */
6370 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6371 			       struct nfs_writeres *res)
6372 {
6373 	struct compound_hdr hdr;
6374 	int status;
6375 
6376 	status = decode_compound_hdr(xdr, &hdr);
6377 	if (status)
6378 		goto out;
6379 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6380 	if (status)
6381 		goto out;
6382 	status = decode_putfh(xdr);
6383 	if (status)
6384 		goto out;
6385 	status = decode_commit(xdr, res);
6386 	if (status)
6387 		goto out;
6388 	if (res->fattr)
6389 		decode_getfattr(xdr, res->fattr, res->server,
6390 				!RPC_IS_ASYNC(rqstp->rq_task));
6391 out:
6392 	return status;
6393 }
6394 
6395 /*
6396  * Decode FSINFO response
6397  */
6398 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
6399 			       struct nfs4_fsinfo_res *res)
6400 {
6401 	struct compound_hdr hdr;
6402 	int status;
6403 
6404 	status = decode_compound_hdr(xdr, &hdr);
6405 	if (!status)
6406 		status = decode_sequence(xdr, &res->seq_res, req);
6407 	if (!status)
6408 		status = decode_putfh(xdr);
6409 	if (!status)
6410 		status = decode_fsinfo(xdr, res->fsinfo);
6411 	return status;
6412 }
6413 
6414 /*
6415  * Decode PATHCONF response
6416  */
6417 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
6418 				 struct nfs4_pathconf_res *res)
6419 {
6420 	struct compound_hdr hdr;
6421 	int status;
6422 
6423 	status = decode_compound_hdr(xdr, &hdr);
6424 	if (!status)
6425 		status = decode_sequence(xdr, &res->seq_res, req);
6426 	if (!status)
6427 		status = decode_putfh(xdr);
6428 	if (!status)
6429 		status = decode_pathconf(xdr, res->pathconf);
6430 	return status;
6431 }
6432 
6433 /*
6434  * Decode STATFS response
6435  */
6436 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
6437 			       struct nfs4_statfs_res *res)
6438 {
6439 	struct compound_hdr hdr;
6440 	int status;
6441 
6442 	status = decode_compound_hdr(xdr, &hdr);
6443 	if (!status)
6444 		status = decode_sequence(xdr, &res->seq_res, req);
6445 	if (!status)
6446 		status = decode_putfh(xdr);
6447 	if (!status)
6448 		status = decode_statfs(xdr, res->fsstat);
6449 	return status;
6450 }
6451 
6452 /*
6453  * Decode GETATTR_BITMAP response
6454  */
6455 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
6456 				    struct xdr_stream *xdr,
6457 				    struct nfs4_server_caps_res *res)
6458 {
6459 	struct compound_hdr hdr;
6460 	int status;
6461 
6462 	status = decode_compound_hdr(xdr, &hdr);
6463 	if (status)
6464 		goto out;
6465 	status = decode_sequence(xdr, &res->seq_res, req);
6466 	if (status)
6467 		goto out;
6468 	status = decode_putfh(xdr);
6469 	if (status)
6470 		goto out;
6471 	status = decode_server_caps(xdr, res);
6472 out:
6473 	return status;
6474 }
6475 
6476 /*
6477  * Decode RENEW response
6478  */
6479 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6480 			      void *__unused)
6481 {
6482 	struct compound_hdr hdr;
6483 	int status;
6484 
6485 	status = decode_compound_hdr(xdr, &hdr);
6486 	if (!status)
6487 		status = decode_renew(xdr);
6488 	return status;
6489 }
6490 
6491 /*
6492  * Decode SETCLIENTID response
6493  */
6494 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
6495 				    struct xdr_stream *xdr,
6496 				    struct nfs4_setclientid_res *res)
6497 {
6498 	struct compound_hdr hdr;
6499 	int status;
6500 
6501 	status = decode_compound_hdr(xdr, &hdr);
6502 	if (!status)
6503 		status = decode_setclientid(xdr, res);
6504 	return status;
6505 }
6506 
6507 /*
6508  * Decode SETCLIENTID_CONFIRM response
6509  */
6510 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
6511 					    struct xdr_stream *xdr,
6512 					    struct nfs_fsinfo *fsinfo)
6513 {
6514 	struct compound_hdr hdr;
6515 	int status;
6516 
6517 	status = decode_compound_hdr(xdr, &hdr);
6518 	if (!status)
6519 		status = decode_setclientid_confirm(xdr);
6520 	if (!status)
6521 		status = decode_putrootfh(xdr);
6522 	if (!status)
6523 		status = decode_fsinfo(xdr, fsinfo);
6524 	return status;
6525 }
6526 
6527 /*
6528  * Decode DELEGRETURN response
6529  */
6530 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
6531 				    struct xdr_stream *xdr,
6532 				    struct nfs4_delegreturnres *res)
6533 {
6534 	struct compound_hdr hdr;
6535 	int status;
6536 
6537 	status = decode_compound_hdr(xdr, &hdr);
6538 	if (status)
6539 		goto out;
6540 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6541 	if (status)
6542 		goto out;
6543 	status = decode_putfh(xdr);
6544 	if (status != 0)
6545 		goto out;
6546 	status = decode_delegreturn(xdr);
6547 	if (status != 0)
6548 		goto out;
6549 	decode_getfattr(xdr, res->fattr, res->server,
6550 			!RPC_IS_ASYNC(rqstp->rq_task));
6551 out:
6552 	return status;
6553 }
6554 
6555 /*
6556  * Decode FS_LOCATIONS response
6557  */
6558 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
6559 				     struct xdr_stream *xdr,
6560 				     struct nfs4_fs_locations_res *res)
6561 {
6562 	struct compound_hdr hdr;
6563 	int status;
6564 
6565 	status = decode_compound_hdr(xdr, &hdr);
6566 	if (status)
6567 		goto out;
6568 	status = decode_sequence(xdr, &res->seq_res, req);
6569 	if (status)
6570 		goto out;
6571 	status = decode_putfh(xdr);
6572 	if (status)
6573 		goto out;
6574 	status = decode_lookup(xdr);
6575 	if (status)
6576 		goto out;
6577 	xdr_enter_page(xdr, PAGE_SIZE);
6578 	status = decode_getfattr(xdr, &res->fs_locations->fattr,
6579 				 res->fs_locations->server,
6580 				 !RPC_IS_ASYNC(req->rq_task));
6581 out:
6582 	return status;
6583 }
6584 
6585 /*
6586  * Decode SECINFO response
6587  */
6588 static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
6589 				struct xdr_stream *xdr,
6590 				struct nfs4_secinfo_res *res)
6591 {
6592 	struct compound_hdr hdr;
6593 	int status;
6594 
6595 	status = decode_compound_hdr(xdr, &hdr);
6596 	if (status)
6597 		goto out;
6598 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6599 	if (status)
6600 		goto out;
6601 	status = decode_putfh(xdr);
6602 	if (status)
6603 		goto out;
6604 	status = decode_secinfo(xdr, res);
6605 	if (status)
6606 		goto out;
6607 out:
6608 	return status;
6609 }
6610 
6611 #if defined(CONFIG_NFS_V4_1)
6612 /*
6613  * Decode EXCHANGE_ID response
6614  */
6615 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
6616 				    struct xdr_stream *xdr,
6617 				    void *res)
6618 {
6619 	struct compound_hdr hdr;
6620 	int status;
6621 
6622 	status = decode_compound_hdr(xdr, &hdr);
6623 	if (!status)
6624 		status = decode_exchange_id(xdr, res);
6625 	return status;
6626 }
6627 
6628 /*
6629  * Decode CREATE_SESSION response
6630  */
6631 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
6632 				       struct xdr_stream *xdr,
6633 				       struct nfs41_create_session_res *res)
6634 {
6635 	struct compound_hdr hdr;
6636 	int status;
6637 
6638 	status = decode_compound_hdr(xdr, &hdr);
6639 	if (!status)
6640 		status = decode_create_session(xdr, res);
6641 	return status;
6642 }
6643 
6644 /*
6645  * Decode DESTROY_SESSION response
6646  */
6647 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
6648 					struct xdr_stream *xdr,
6649 					void *res)
6650 {
6651 	struct compound_hdr hdr;
6652 	int status;
6653 
6654 	status = decode_compound_hdr(xdr, &hdr);
6655 	if (!status)
6656 		status = decode_destroy_session(xdr, res);
6657 	return status;
6658 }
6659 
6660 /*
6661  * Decode SEQUENCE response
6662  */
6663 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
6664 				 struct xdr_stream *xdr,
6665 				 struct nfs4_sequence_res *res)
6666 {
6667 	struct compound_hdr hdr;
6668 	int status;
6669 
6670 	status = decode_compound_hdr(xdr, &hdr);
6671 	if (!status)
6672 		status = decode_sequence(xdr, res, rqstp);
6673 	return status;
6674 }
6675 
6676 /*
6677  * Decode GET_LEASE_TIME response
6678  */
6679 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
6680 				       struct xdr_stream *xdr,
6681 				       struct nfs4_get_lease_time_res *res)
6682 {
6683 	struct compound_hdr hdr;
6684 	int status;
6685 
6686 	status = decode_compound_hdr(xdr, &hdr);
6687 	if (!status)
6688 		status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
6689 	if (!status)
6690 		status = decode_putrootfh(xdr);
6691 	if (!status)
6692 		status = decode_fsinfo(xdr, res->lr_fsinfo);
6693 	return status;
6694 }
6695 
6696 /*
6697  * Decode RECLAIM_COMPLETE response
6698  */
6699 static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
6700 					 struct xdr_stream *xdr,
6701 					 struct nfs41_reclaim_complete_res *res)
6702 {
6703 	struct compound_hdr hdr;
6704 	int status;
6705 
6706 	status = decode_compound_hdr(xdr, &hdr);
6707 	if (!status)
6708 		status = decode_sequence(xdr, &res->seq_res, rqstp);
6709 	if (!status)
6710 		status = decode_reclaim_complete(xdr, (void *)NULL);
6711 	return status;
6712 }
6713 
6714 /*
6715  * Decode GETDEVICELIST response
6716  */
6717 static int nfs4_xdr_dec_getdevicelist(struct rpc_rqst *rqstp,
6718 				      struct xdr_stream *xdr,
6719 				      struct nfs4_getdevicelist_res *res)
6720 {
6721 	struct compound_hdr hdr;
6722 	int status;
6723 
6724 	dprintk("encoding getdevicelist!\n");
6725 
6726 	status = decode_compound_hdr(xdr, &hdr);
6727 	if (status != 0)
6728 		goto out;
6729 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6730 	if (status != 0)
6731 		goto out;
6732 	status = decode_putfh(xdr);
6733 	if (status != 0)
6734 		goto out;
6735 	status = decode_getdevicelist(xdr, res->devlist);
6736 out:
6737 	return status;
6738 }
6739 
6740 /*
6741  * Decode GETDEVINFO response
6742  */
6743 static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
6744 				      struct xdr_stream *xdr,
6745 				      struct nfs4_getdeviceinfo_res *res)
6746 {
6747 	struct compound_hdr hdr;
6748 	int status;
6749 
6750 	status = decode_compound_hdr(xdr, &hdr);
6751 	if (status != 0)
6752 		goto out;
6753 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6754 	if (status != 0)
6755 		goto out;
6756 	status = decode_getdeviceinfo(xdr, res->pdev);
6757 out:
6758 	return status;
6759 }
6760 
6761 /*
6762  * Decode LAYOUTGET response
6763  */
6764 static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
6765 				  struct xdr_stream *xdr,
6766 				  struct nfs4_layoutget_res *res)
6767 {
6768 	struct compound_hdr hdr;
6769 	int status;
6770 
6771 	status = decode_compound_hdr(xdr, &hdr);
6772 	if (status)
6773 		goto out;
6774 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6775 	if (status)
6776 		goto out;
6777 	status = decode_putfh(xdr);
6778 	if (status)
6779 		goto out;
6780 	status = decode_layoutget(xdr, rqstp, res);
6781 out:
6782 	return status;
6783 }
6784 
6785 /*
6786  * Decode LAYOUTRETURN response
6787  */
6788 static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
6789 				     struct xdr_stream *xdr,
6790 				     struct nfs4_layoutreturn_res *res)
6791 {
6792 	struct compound_hdr hdr;
6793 	int status;
6794 
6795 	status = decode_compound_hdr(xdr, &hdr);
6796 	if (status)
6797 		goto out;
6798 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6799 	if (status)
6800 		goto out;
6801 	status = decode_putfh(xdr);
6802 	if (status)
6803 		goto out;
6804 	status = decode_layoutreturn(xdr, res);
6805 out:
6806 	return status;
6807 }
6808 
6809 /*
6810  * Decode LAYOUTCOMMIT response
6811  */
6812 static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
6813 				     struct xdr_stream *xdr,
6814 				     struct nfs4_layoutcommit_res *res)
6815 {
6816 	struct compound_hdr hdr;
6817 	int status;
6818 
6819 	status = decode_compound_hdr(xdr, &hdr);
6820 	if (status)
6821 		goto out;
6822 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6823 	if (status)
6824 		goto out;
6825 	status = decode_putfh(xdr);
6826 	if (status)
6827 		goto out;
6828 	status = decode_layoutcommit(xdr, rqstp, res);
6829 	if (status)
6830 		goto out;
6831 	decode_getfattr(xdr, res->fattr, res->server,
6832 			!RPC_IS_ASYNC(rqstp->rq_task));
6833 out:
6834 	return status;
6835 }
6836 
6837 /*
6838  * Decode SECINFO_NO_NAME response
6839  */
6840 static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
6841 					struct xdr_stream *xdr,
6842 					struct nfs4_secinfo_res *res)
6843 {
6844 	struct compound_hdr hdr;
6845 	int status;
6846 
6847 	status = decode_compound_hdr(xdr, &hdr);
6848 	if (status)
6849 		goto out;
6850 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6851 	if (status)
6852 		goto out;
6853 	status = decode_putrootfh(xdr);
6854 	if (status)
6855 		goto out;
6856 	status = decode_secinfo(xdr, res);
6857 out:
6858 	return status;
6859 }
6860 
6861 /*
6862  * Decode TEST_STATEID response
6863  */
6864 static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
6865 				     struct xdr_stream *xdr,
6866 				     struct nfs41_test_stateid_res *res)
6867 {
6868 	struct compound_hdr hdr;
6869 	int status;
6870 
6871 	status = decode_compound_hdr(xdr, &hdr);
6872 	if (status)
6873 		goto out;
6874 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6875 	if (status)
6876 		goto out;
6877 	status = decode_test_stateid(xdr, res);
6878 out:
6879 	return status;
6880 }
6881 
6882 /*
6883  * Decode FREE_STATEID response
6884  */
6885 static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
6886 				     struct xdr_stream *xdr,
6887 				     struct nfs41_free_stateid_res *res)
6888 {
6889 	struct compound_hdr hdr;
6890 	int status;
6891 
6892 	status = decode_compound_hdr(xdr, &hdr);
6893 	if (status)
6894 		goto out;
6895 	status = decode_sequence(xdr, &res->seq_res, rqstp);
6896 	if (status)
6897 		goto out;
6898 	status = decode_free_stateid(xdr, res);
6899 out:
6900 	return status;
6901 }
6902 #endif /* CONFIG_NFS_V4_1 */
6903 
6904 /**
6905  * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
6906  *                      the local page cache.
6907  * @xdr: XDR stream where entry resides
6908  * @entry: buffer to fill in with entry data
6909  * @plus: boolean indicating whether this should be a readdirplus entry
6910  *
6911  * Returns zero if successful, otherwise a negative errno value is
6912  * returned.
6913  *
6914  * This function is not invoked during READDIR reply decoding, but
6915  * rather whenever an application invokes the getdents(2) system call
6916  * on a directory already in our cache.
6917  */
6918 int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
6919 		       int plus)
6920 {
6921 	uint32_t bitmap[3] = {0};
6922 	uint32_t len;
6923 	__be32 *p = xdr_inline_decode(xdr, 4);
6924 	if (unlikely(!p))
6925 		goto out_overflow;
6926 	if (*p == xdr_zero) {
6927 		p = xdr_inline_decode(xdr, 4);
6928 		if (unlikely(!p))
6929 			goto out_overflow;
6930 		if (*p == xdr_zero)
6931 			return -EAGAIN;
6932 		entry->eof = 1;
6933 		return -EBADCOOKIE;
6934 	}
6935 
6936 	p = xdr_inline_decode(xdr, 12);
6937 	if (unlikely(!p))
6938 		goto out_overflow;
6939 	entry->prev_cookie = entry->cookie;
6940 	p = xdr_decode_hyper(p, &entry->cookie);
6941 	entry->len = be32_to_cpup(p);
6942 
6943 	p = xdr_inline_decode(xdr, entry->len);
6944 	if (unlikely(!p))
6945 		goto out_overflow;
6946 	entry->name = (const char *) p;
6947 
6948 	/*
6949 	 * In case the server doesn't return an inode number,
6950 	 * we fake one here.  (We don't use inode number 0,
6951 	 * since glibc seems to choke on it...)
6952 	 */
6953 	entry->ino = 1;
6954 	entry->fattr->valid = 0;
6955 
6956 	if (decode_attr_bitmap(xdr, bitmap) < 0)
6957 		goto out_overflow;
6958 
6959 	if (decode_attr_length(xdr, &len, &p) < 0)
6960 		goto out_overflow;
6961 
6962 	if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
6963 					entry->server, 1) < 0)
6964 		goto out_overflow;
6965 	if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
6966 		entry->ino = entry->fattr->mounted_on_fileid;
6967 	else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
6968 		entry->ino = entry->fattr->fileid;
6969 
6970 	entry->d_type = DT_UNKNOWN;
6971 	if (entry->fattr->valid & NFS_ATTR_FATTR_TYPE)
6972 		entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
6973 
6974 	return 0;
6975 
6976 out_overflow:
6977 	print_overflow_msg(__func__, xdr);
6978 	return -EAGAIN;
6979 }
6980 
6981 /*
6982  * We need to translate between nfs status return values and
6983  * the local errno values which may not be the same.
6984  */
6985 static struct {
6986 	int stat;
6987 	int errno;
6988 } nfs_errtbl[] = {
6989 	{ NFS4_OK,		0		},
6990 	{ NFS4ERR_PERM,		-EPERM		},
6991 	{ NFS4ERR_NOENT,	-ENOENT		},
6992 	{ NFS4ERR_IO,		-errno_NFSERR_IO},
6993 	{ NFS4ERR_NXIO,		-ENXIO		},
6994 	{ NFS4ERR_ACCESS,	-EACCES		},
6995 	{ NFS4ERR_EXIST,	-EEXIST		},
6996 	{ NFS4ERR_XDEV,		-EXDEV		},
6997 	{ NFS4ERR_NOTDIR,	-ENOTDIR	},
6998 	{ NFS4ERR_ISDIR,	-EISDIR		},
6999 	{ NFS4ERR_INVAL,	-EINVAL		},
7000 	{ NFS4ERR_FBIG,		-EFBIG		},
7001 	{ NFS4ERR_NOSPC,	-ENOSPC		},
7002 	{ NFS4ERR_ROFS,		-EROFS		},
7003 	{ NFS4ERR_MLINK,	-EMLINK		},
7004 	{ NFS4ERR_NAMETOOLONG,	-ENAMETOOLONG	},
7005 	{ NFS4ERR_NOTEMPTY,	-ENOTEMPTY	},
7006 	{ NFS4ERR_DQUOT,	-EDQUOT		},
7007 	{ NFS4ERR_STALE,	-ESTALE		},
7008 	{ NFS4ERR_BADHANDLE,	-EBADHANDLE	},
7009 	{ NFS4ERR_BAD_COOKIE,	-EBADCOOKIE	},
7010 	{ NFS4ERR_NOTSUPP,	-ENOTSUPP	},
7011 	{ NFS4ERR_TOOSMALL,	-ETOOSMALL	},
7012 	{ NFS4ERR_SERVERFAULT,	-EREMOTEIO	},
7013 	{ NFS4ERR_BADTYPE,	-EBADTYPE	},
7014 	{ NFS4ERR_LOCKED,	-EAGAIN		},
7015 	{ NFS4ERR_SYMLINK,	-ELOOP		},
7016 	{ NFS4ERR_OP_ILLEGAL,	-EOPNOTSUPP	},
7017 	{ NFS4ERR_DEADLOCK,	-EDEADLK	},
7018 	{ -1,			-EIO		}
7019 };
7020 
7021 /*
7022  * Convert an NFS error code to a local one.
7023  * This one is used jointly by NFSv2 and NFSv3.
7024  */
7025 static int
7026 nfs4_stat_to_errno(int stat)
7027 {
7028 	int i;
7029 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
7030 		if (nfs_errtbl[i].stat == stat)
7031 			return nfs_errtbl[i].errno;
7032 	}
7033 	if (stat <= 10000 || stat > 10100) {
7034 		/* The server is looney tunes. */
7035 		return -EREMOTEIO;
7036 	}
7037 	/* If we cannot translate the error, the recovery routines should
7038 	 * handle it.
7039 	 * Note: remaining NFSv4 error codes have values > 10000, so should
7040 	 * not conflict with native Linux error codes.
7041 	 */
7042 	return -stat;
7043 }
7044 
7045 #define PROC(proc, argtype, restype)				\
7046 [NFSPROC4_CLNT_##proc] = {					\
7047 	.p_proc   = NFSPROC4_COMPOUND,				\
7048 	.p_encode = (kxdreproc_t)nfs4_xdr_##argtype,		\
7049 	.p_decode = (kxdrdproc_t)nfs4_xdr_##restype,		\
7050 	.p_arglen = NFS4_##argtype##_sz,			\
7051 	.p_replen = NFS4_##restype##_sz,			\
7052 	.p_statidx = NFSPROC4_CLNT_##proc,			\
7053 	.p_name   = #proc,					\
7054 }
7055 
7056 struct rpc_procinfo	nfs4_procedures[] = {
7057 	PROC(READ,		enc_read,		dec_read),
7058 	PROC(WRITE,		enc_write,		dec_write),
7059 	PROC(COMMIT,		enc_commit,		dec_commit),
7060 	PROC(OPEN,		enc_open,		dec_open),
7061 	PROC(OPEN_CONFIRM,	enc_open_confirm,	dec_open_confirm),
7062 	PROC(OPEN_NOATTR,	enc_open_noattr,	dec_open_noattr),
7063 	PROC(OPEN_DOWNGRADE,	enc_open_downgrade,	dec_open_downgrade),
7064 	PROC(CLOSE,		enc_close,		dec_close),
7065 	PROC(SETATTR,		enc_setattr,		dec_setattr),
7066 	PROC(FSINFO,		enc_fsinfo,		dec_fsinfo),
7067 	PROC(RENEW,		enc_renew,		dec_renew),
7068 	PROC(SETCLIENTID,	enc_setclientid,	dec_setclientid),
7069 	PROC(SETCLIENTID_CONFIRM, enc_setclientid_confirm, dec_setclientid_confirm),
7070 	PROC(LOCK,		enc_lock,		dec_lock),
7071 	PROC(LOCKT,		enc_lockt,		dec_lockt),
7072 	PROC(LOCKU,		enc_locku,		dec_locku),
7073 	PROC(ACCESS,		enc_access,		dec_access),
7074 	PROC(GETATTR,		enc_getattr,		dec_getattr),
7075 	PROC(LOOKUP,		enc_lookup,		dec_lookup),
7076 	PROC(LOOKUP_ROOT,	enc_lookup_root,	dec_lookup_root),
7077 	PROC(REMOVE,		enc_remove,		dec_remove),
7078 	PROC(RENAME,		enc_rename,		dec_rename),
7079 	PROC(LINK,		enc_link,		dec_link),
7080 	PROC(SYMLINK,		enc_symlink,		dec_symlink),
7081 	PROC(CREATE,		enc_create,		dec_create),
7082 	PROC(PATHCONF,		enc_pathconf,		dec_pathconf),
7083 	PROC(STATFS,		enc_statfs,		dec_statfs),
7084 	PROC(READLINK,		enc_readlink,		dec_readlink),
7085 	PROC(READDIR,		enc_readdir,		dec_readdir),
7086 	PROC(SERVER_CAPS,	enc_server_caps,	dec_server_caps),
7087 	PROC(DELEGRETURN,	enc_delegreturn,	dec_delegreturn),
7088 	PROC(GETACL,		enc_getacl,		dec_getacl),
7089 	PROC(SETACL,		enc_setacl,		dec_setacl),
7090 	PROC(FS_LOCATIONS,	enc_fs_locations,	dec_fs_locations),
7091 	PROC(RELEASE_LOCKOWNER,	enc_release_lockowner,	dec_release_lockowner),
7092 	PROC(SECINFO,		enc_secinfo,		dec_secinfo),
7093 #if defined(CONFIG_NFS_V4_1)
7094 	PROC(EXCHANGE_ID,	enc_exchange_id,	dec_exchange_id),
7095 	PROC(CREATE_SESSION,	enc_create_session,	dec_create_session),
7096 	PROC(DESTROY_SESSION,	enc_destroy_session,	dec_destroy_session),
7097 	PROC(SEQUENCE,		enc_sequence,		dec_sequence),
7098 	PROC(GET_LEASE_TIME,	enc_get_lease_time,	dec_get_lease_time),
7099 	PROC(RECLAIM_COMPLETE,	enc_reclaim_complete,	dec_reclaim_complete),
7100 	PROC(GETDEVICEINFO,	enc_getdeviceinfo,	dec_getdeviceinfo),
7101 	PROC(LAYOUTGET,		enc_layoutget,		dec_layoutget),
7102 	PROC(LAYOUTCOMMIT,	enc_layoutcommit,	dec_layoutcommit),
7103 	PROC(LAYOUTRETURN,	enc_layoutreturn,	dec_layoutreturn),
7104 	PROC(SECINFO_NO_NAME,	enc_secinfo_no_name,	dec_secinfo_no_name),
7105 	PROC(TEST_STATEID,	enc_test_stateid,	dec_test_stateid),
7106 	PROC(FREE_STATEID,	enc_free_stateid,	dec_free_stateid),
7107 	PROC(GETDEVICELIST,	enc_getdevicelist,	dec_getdevicelist),
7108 #endif /* CONFIG_NFS_V4_1 */
7109 };
7110 
7111 struct rpc_version		nfs_version4 = {
7112 	.number			= 4,
7113 	.nrprocs		= ARRAY_SIZE(nfs4_procedures),
7114 	.procs			= nfs4_procedures
7115 };
7116 
7117 /*
7118  * Local variables:
7119  *  c-basic-offset: 8
7120  * End:
7121  */
7122