xref: /linux/fs/nfs/nfs4xdr.c (revision f24e9f586b377749dff37554696cf3a105540c94)
1 /*
2  *  fs/nfs/nfs4xdr.c
3  *
4  *  Client-side XDR for NFSv4.
5  *
6  *  Copyright (c) 2002 The Regents of the University of Michigan.
7  *  All rights reserved.
8  *
9  *  Kendrick Smith <kmsmith@umich.edu>
10  *  Andy Adamson   <andros@umich.edu>
11  *
12  *  Redistribution and use in source and binary forms, with or without
13  *  modification, are permitted provided that the following conditions
14  *  are met:
15  *
16  *  1. Redistributions of source code must retain the above copyright
17  *     notice, this list of conditions and the following disclaimer.
18  *  2. Redistributions in binary form must reproduce the above copyright
19  *     notice, this list of conditions and the following disclaimer in the
20  *     documentation and/or other materials provided with the distribution.
21  *  3. Neither the name of the University nor the names of its
22  *     contributors may be used to endorse or promote products derived
23  *     from this software without specific prior written permission.
24  *
25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include <linux/param.h>
39 #include <linux/time.h>
40 #include <linux/mm.h>
41 #include <linux/slab.h>
42 #include <linux/utsname.h>
43 #include <linux/errno.h>
44 #include <linux/string.h>
45 #include <linux/in.h>
46 #include <linux/pagemap.h>
47 #include <linux/proc_fs.h>
48 #include <linux/kdev_t.h>
49 #include <linux/sunrpc/clnt.h>
50 #include <linux/nfs.h>
51 #include <linux/nfs4.h>
52 #include <linux/nfs_fs.h>
53 #include <linux/nfs_idmap.h>
54 #include "nfs4_fs.h"
55 
56 #define NFSDBG_FACILITY		NFSDBG_XDR
57 
58 /* Mapping from NFS error code to "errno" error code. */
59 #define errno_NFSERR_IO		EIO
60 
61 static int nfs_stat_to_errno(int);
62 
63 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
64 #ifdef DEBUG
65 #define NFS4_MAXTAGLEN		20
66 #else
67 #define NFS4_MAXTAGLEN		0
68 #endif
69 
70 /* lock,open owner id:
71  * we currently use size 1 (u32) out of (NFS4_OPAQUE_LIMIT  >> 2)
72  */
73 #define owner_id_maxsz          (1 + 1)
74 #define compound_encode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
75 #define compound_decode_hdr_maxsz	(3 + (NFS4_MAXTAGLEN >> 2))
76 #define op_encode_hdr_maxsz	(1)
77 #define op_decode_hdr_maxsz	(2)
78 #define encode_putfh_maxsz	(op_encode_hdr_maxsz + 1 + \
79 				(NFS4_FHSIZE >> 2))
80 #define decode_putfh_maxsz	(op_decode_hdr_maxsz)
81 #define encode_putrootfh_maxsz	(op_encode_hdr_maxsz)
82 #define decode_putrootfh_maxsz	(op_decode_hdr_maxsz)
83 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
84 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
85 				((3+NFS4_FHSIZE) >> 2))
86 #define nfs4_fattr_bitmap_maxsz 3
87 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
88 #define nfs4_name_maxsz		(1 + ((3 + NFS4_MAXNAMLEN) >> 2))
89 #define nfs4_path_maxsz		(1 + ((3 + NFS4_MAXPATHLEN) >> 2))
90 /* This is based on getfattr, which uses the most attributes: */
91 #define nfs4_fattr_value_maxsz	(1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
92 				3 + 3 + 3 + 2 * nfs4_name_maxsz))
93 #define nfs4_fattr_maxsz	(nfs4_fattr_bitmap_maxsz + \
94 				nfs4_fattr_value_maxsz)
95 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
96 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
97 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
98 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
99 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
100 #define encode_fsinfo_maxsz	(op_encode_hdr_maxsz + 2)
101 #define decode_fsinfo_maxsz	(op_decode_hdr_maxsz + 11)
102 #define encode_renew_maxsz	(op_encode_hdr_maxsz + 3)
103 #define decode_renew_maxsz	(op_decode_hdr_maxsz)
104 #define encode_setclientid_maxsz \
105 				(op_encode_hdr_maxsz + \
106 				4 /*server->ip_addr*/ + \
107 				1 /*Netid*/ + \
108 				6 /*uaddr*/ + \
109 				6 + (NFS4_VERIFIER_SIZE >> 2))
110 #define decode_setclientid_maxsz \
111 				(op_decode_hdr_maxsz + \
112 				2 + \
113 				1024) /* large value for CLID_INUSE */
114 #define encode_setclientid_confirm_maxsz \
115 				(op_encode_hdr_maxsz + \
116 				3 + (NFS4_VERIFIER_SIZE >> 2))
117 #define decode_setclientid_confirm_maxsz \
118 				(op_decode_hdr_maxsz)
119 #define encode_lookup_maxsz	(op_encode_hdr_maxsz + \
120 				1 + ((3 + NFS4_FHSIZE) >> 2))
121 #define encode_remove_maxsz	(op_encode_hdr_maxsz + \
122 				nfs4_name_maxsz)
123 #define encode_rename_maxsz	(op_encode_hdr_maxsz + \
124 				2 * nfs4_name_maxsz)
125 #define decode_rename_maxsz	(op_decode_hdr_maxsz + 5 + 5)
126 #define encode_link_maxsz	(op_encode_hdr_maxsz + \
127 				nfs4_name_maxsz)
128 #define decode_link_maxsz	(op_decode_hdr_maxsz + 5)
129 #define encode_symlink_maxsz	(op_encode_hdr_maxsz + \
130 				1 + nfs4_name_maxsz + \
131 				nfs4_path_maxsz + \
132 				nfs4_fattr_maxsz)
133 #define decode_symlink_maxsz	(op_decode_hdr_maxsz + 8)
134 #define encode_create_maxsz	(op_encode_hdr_maxsz + \
135 				2 + nfs4_name_maxsz + \
136 				nfs4_fattr_maxsz)
137 #define decode_create_maxsz	(op_decode_hdr_maxsz + 8)
138 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
139 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
140 #define NFS4_enc_compound_sz	(1024)  /* XXX: large enough? */
141 #define NFS4_dec_compound_sz	(1024)  /* XXX: large enough? */
142 #define NFS4_enc_read_sz	(compound_encode_hdr_maxsz + \
143 				encode_putfh_maxsz + \
144 				op_encode_hdr_maxsz + 7)
145 #define NFS4_dec_read_sz	(compound_decode_hdr_maxsz + \
146 				decode_putfh_maxsz + \
147 				op_decode_hdr_maxsz + 2)
148 #define NFS4_enc_readlink_sz	(compound_encode_hdr_maxsz + \
149 				encode_putfh_maxsz + \
150 				op_encode_hdr_maxsz)
151 #define NFS4_dec_readlink_sz	(compound_decode_hdr_maxsz + \
152 				decode_putfh_maxsz + \
153 				op_decode_hdr_maxsz)
154 #define NFS4_enc_readdir_sz	(compound_encode_hdr_maxsz + \
155 				encode_putfh_maxsz + \
156 				op_encode_hdr_maxsz + 9)
157 #define NFS4_dec_readdir_sz	(compound_decode_hdr_maxsz + \
158 				decode_putfh_maxsz + \
159 				op_decode_hdr_maxsz + 2)
160 #define NFS4_enc_write_sz	(compound_encode_hdr_maxsz + \
161 				encode_putfh_maxsz + \
162 				op_encode_hdr_maxsz + 8 + \
163 				encode_getattr_maxsz)
164 #define NFS4_dec_write_sz	(compound_decode_hdr_maxsz + \
165 				decode_putfh_maxsz + \
166 				op_decode_hdr_maxsz + 4 + \
167 				decode_getattr_maxsz)
168 #define NFS4_enc_commit_sz	(compound_encode_hdr_maxsz + \
169 				encode_putfh_maxsz + \
170 				op_encode_hdr_maxsz + 3 + \
171 				encode_getattr_maxsz)
172 #define NFS4_dec_commit_sz	(compound_decode_hdr_maxsz + \
173 				decode_putfh_maxsz + \
174 				op_decode_hdr_maxsz + 2 + \
175 				decode_getattr_maxsz)
176 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
177                                 encode_putfh_maxsz + \
178                                 op_encode_hdr_maxsz + \
179                                 13 + 3 + 2 + 64 + \
180                                 encode_getattr_maxsz + \
181                                 encode_getfh_maxsz)
182 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
183                                 decode_putfh_maxsz + \
184                                 op_decode_hdr_maxsz + 4 + 5 + 2 + 3 + \
185                                 decode_getattr_maxsz + \
186                                 decode_getfh_maxsz)
187 #define NFS4_enc_open_confirm_sz      \
188                                 (compound_encode_hdr_maxsz + \
189                                 encode_putfh_maxsz + \
190                                 op_encode_hdr_maxsz + 5)
191 #define NFS4_dec_open_confirm_sz        (compound_decode_hdr_maxsz + \
192                                         decode_putfh_maxsz + \
193                                         op_decode_hdr_maxsz + 4)
194 #define NFS4_enc_open_noattr_sz	(compound_encode_hdr_maxsz + \
195 					encode_putfh_maxsz + \
196 					op_encode_hdr_maxsz + \
197 					11)
198 #define NFS4_dec_open_noattr_sz	(compound_decode_hdr_maxsz + \
199 					decode_putfh_maxsz + \
200 					op_decode_hdr_maxsz + \
201 					4 + 5 + 2 + 3)
202 #define NFS4_enc_open_downgrade_sz \
203 				(compound_encode_hdr_maxsz + \
204                                 encode_putfh_maxsz + \
205                                 op_encode_hdr_maxsz + 7 + \
206 				encode_getattr_maxsz)
207 #define NFS4_dec_open_downgrade_sz \
208 				(compound_decode_hdr_maxsz + \
209                                 decode_putfh_maxsz + \
210                                 op_decode_hdr_maxsz + 4 + \
211 				decode_getattr_maxsz)
212 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
213                                 encode_putfh_maxsz + \
214                                 op_encode_hdr_maxsz + 5 + \
215 				encode_getattr_maxsz)
216 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
217                                 decode_putfh_maxsz + \
218                                 op_decode_hdr_maxsz + 4 + \
219 				decode_getattr_maxsz)
220 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
221                                 encode_putfh_maxsz + \
222                                 op_encode_hdr_maxsz + 4 + \
223                                 nfs4_fattr_maxsz + \
224                                 encode_getattr_maxsz)
225 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
226                                 decode_putfh_maxsz + \
227                                 op_decode_hdr_maxsz + 3)
228 #define NFS4_enc_fsinfo_sz	(compound_encode_hdr_maxsz + \
229 				encode_putfh_maxsz + \
230 				encode_fsinfo_maxsz)
231 #define NFS4_dec_fsinfo_sz	(compound_decode_hdr_maxsz + \
232 				decode_putfh_maxsz + \
233 				decode_fsinfo_maxsz)
234 #define NFS4_enc_renew_sz	(compound_encode_hdr_maxsz + \
235 				encode_renew_maxsz)
236 #define NFS4_dec_renew_sz	(compound_decode_hdr_maxsz + \
237 				decode_renew_maxsz)
238 #define NFS4_enc_setclientid_sz	(compound_encode_hdr_maxsz + \
239 				encode_setclientid_maxsz)
240 #define NFS4_dec_setclientid_sz	(compound_decode_hdr_maxsz + \
241 				decode_setclientid_maxsz)
242 #define NFS4_enc_setclientid_confirm_sz \
243 				(compound_encode_hdr_maxsz + \
244 				encode_setclientid_confirm_maxsz + \
245 				encode_putrootfh_maxsz + \
246 				encode_fsinfo_maxsz)
247 #define NFS4_dec_setclientid_confirm_sz \
248 				(compound_decode_hdr_maxsz + \
249 				decode_setclientid_confirm_maxsz + \
250 				decode_putrootfh_maxsz + \
251 				decode_fsinfo_maxsz)
252 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
253 				encode_putfh_maxsz + \
254 				encode_getattr_maxsz + \
255 				op_encode_hdr_maxsz + \
256 				1 + 1 + 2 + 2 + \
257 				1 + 4 + 1 + 2 + \
258 				owner_id_maxsz)
259 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
260 				decode_putfh_maxsz + \
261 				decode_getattr_maxsz + \
262 				op_decode_hdr_maxsz + \
263 				2 + 2 + 1 + 2 + \
264 				owner_id_maxsz)
265 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
266 				encode_putfh_maxsz + \
267 				encode_getattr_maxsz + \
268 				op_encode_hdr_maxsz + \
269 				1 + 2 + 2 + 2 + \
270 				owner_id_maxsz)
271 #define NFS4_dec_lockt_sz       (NFS4_dec_lock_sz)
272 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
273 				encode_putfh_maxsz + \
274 				encode_getattr_maxsz + \
275 				op_encode_hdr_maxsz + \
276 				1 + 1 + 4 + 2 + 2)
277 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
278 				decode_putfh_maxsz + \
279 				decode_getattr_maxsz + \
280 				op_decode_hdr_maxsz + 4)
281 #define NFS4_enc_access_sz	(compound_encode_hdr_maxsz + \
282 				encode_putfh_maxsz + \
283 				op_encode_hdr_maxsz + 1)
284 #define NFS4_dec_access_sz	(compound_decode_hdr_maxsz + \
285 				decode_putfh_maxsz + \
286 				op_decode_hdr_maxsz + 2)
287 #define NFS4_enc_getattr_sz	(compound_encode_hdr_maxsz + \
288 				encode_putfh_maxsz + \
289 				encode_getattr_maxsz)
290 #define NFS4_dec_getattr_sz	(compound_decode_hdr_maxsz + \
291 				decode_putfh_maxsz + \
292 				decode_getattr_maxsz)
293 #define NFS4_enc_lookup_sz	(compound_encode_hdr_maxsz + \
294 				encode_putfh_maxsz + \
295 				encode_lookup_maxsz + \
296 				encode_getattr_maxsz + \
297 				encode_getfh_maxsz)
298 #define NFS4_dec_lookup_sz	(compound_decode_hdr_maxsz + \
299 				decode_putfh_maxsz + \
300 				op_decode_hdr_maxsz + \
301 				decode_getattr_maxsz + \
302 				decode_getfh_maxsz)
303 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
304 				encode_putrootfh_maxsz + \
305 				encode_getattr_maxsz + \
306 				encode_getfh_maxsz)
307 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
308 				decode_putrootfh_maxsz + \
309 				decode_getattr_maxsz + \
310 				decode_getfh_maxsz)
311 #define NFS4_enc_remove_sz	(compound_encode_hdr_maxsz + \
312 				encode_putfh_maxsz + \
313 				encode_remove_maxsz + \
314 				encode_getattr_maxsz)
315 #define NFS4_dec_remove_sz	(compound_decode_hdr_maxsz + \
316 				decode_putfh_maxsz + \
317 				op_decode_hdr_maxsz + 5 + \
318 				decode_getattr_maxsz)
319 #define NFS4_enc_rename_sz	(compound_encode_hdr_maxsz + \
320 				encode_putfh_maxsz + \
321 				encode_savefh_maxsz + \
322 				encode_putfh_maxsz + \
323 				encode_rename_maxsz + \
324 				encode_getattr_maxsz + \
325 				encode_restorefh_maxsz + \
326 				encode_getattr_maxsz)
327 #define NFS4_dec_rename_sz	(compound_decode_hdr_maxsz + \
328 				decode_putfh_maxsz + \
329 				decode_savefh_maxsz + \
330 				decode_putfh_maxsz + \
331 				decode_rename_maxsz + \
332 				decode_getattr_maxsz + \
333 				decode_restorefh_maxsz + \
334 				decode_getattr_maxsz)
335 #define NFS4_enc_link_sz	(compound_encode_hdr_maxsz + \
336 				encode_putfh_maxsz + \
337 				encode_savefh_maxsz + \
338 				encode_putfh_maxsz + \
339 				encode_link_maxsz + \
340 				decode_getattr_maxsz + \
341 				encode_restorefh_maxsz + \
342 				decode_getattr_maxsz)
343 #define NFS4_dec_link_sz	(compound_decode_hdr_maxsz + \
344 				decode_putfh_maxsz + \
345 				decode_savefh_maxsz + \
346 				decode_putfh_maxsz + \
347 				decode_link_maxsz + \
348 				decode_getattr_maxsz + \
349 				decode_restorefh_maxsz + \
350 				decode_getattr_maxsz)
351 #define NFS4_enc_symlink_sz	(compound_encode_hdr_maxsz + \
352 				encode_putfh_maxsz + \
353 				encode_symlink_maxsz + \
354 				encode_getattr_maxsz + \
355 				encode_getfh_maxsz)
356 #define NFS4_dec_symlink_sz	(compound_decode_hdr_maxsz + \
357 				decode_putfh_maxsz + \
358 				decode_symlink_maxsz + \
359 				decode_getattr_maxsz + \
360 				decode_getfh_maxsz)
361 #define NFS4_enc_create_sz	(compound_encode_hdr_maxsz + \
362 				encode_putfh_maxsz + \
363 				encode_savefh_maxsz + \
364 				encode_create_maxsz + \
365 				encode_getfh_maxsz + \
366 				encode_getattr_maxsz + \
367 				encode_restorefh_maxsz + \
368 				encode_getattr_maxsz)
369 #define NFS4_dec_create_sz	(compound_decode_hdr_maxsz + \
370 				decode_putfh_maxsz + \
371 				decode_savefh_maxsz + \
372 				decode_create_maxsz + \
373 				decode_getfh_maxsz + \
374 				decode_getattr_maxsz + \
375 				decode_restorefh_maxsz + \
376 				decode_getattr_maxsz)
377 #define NFS4_enc_pathconf_sz	(compound_encode_hdr_maxsz + \
378 				encode_putfh_maxsz + \
379 				encode_getattr_maxsz)
380 #define NFS4_dec_pathconf_sz	(compound_decode_hdr_maxsz + \
381 				decode_putfh_maxsz + \
382 				decode_getattr_maxsz)
383 #define NFS4_enc_statfs_sz	(compound_encode_hdr_maxsz + \
384 				encode_putfh_maxsz + \
385 				encode_getattr_maxsz)
386 #define NFS4_dec_statfs_sz	(compound_decode_hdr_maxsz + \
387 				decode_putfh_maxsz + \
388 				op_decode_hdr_maxsz + 12)
389 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
390 				encode_getattr_maxsz)
391 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
392 				decode_getattr_maxsz)
393 #define NFS4_enc_delegreturn_sz	(compound_encode_hdr_maxsz + \
394 				encode_putfh_maxsz + \
395 				encode_delegreturn_maxsz + \
396 				encode_getattr_maxsz)
397 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
398 				decode_delegreturn_maxsz + \
399 				decode_getattr_maxsz)
400 #define NFS4_enc_getacl_sz	(compound_encode_hdr_maxsz + \
401 				encode_putfh_maxsz + \
402 				encode_getattr_maxsz)
403 #define NFS4_dec_getacl_sz	(compound_decode_hdr_maxsz + \
404 				decode_putfh_maxsz + \
405 				op_decode_hdr_maxsz + \
406 				nfs4_fattr_bitmap_maxsz + 1)
407 #define NFS4_enc_setacl_sz	(compound_encode_hdr_maxsz + \
408 				encode_putfh_maxsz + \
409 				op_encode_hdr_maxsz + 4 + \
410 				nfs4_fattr_bitmap_maxsz + 1)
411 #define NFS4_dec_setacl_sz	(compound_decode_hdr_maxsz + \
412 				decode_putfh_maxsz + \
413 				op_decode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
414 #define NFS4_enc_fs_locations_sz \
415 				(compound_encode_hdr_maxsz + \
416 				 encode_putfh_maxsz + \
417 				 encode_getattr_maxsz)
418 #define NFS4_dec_fs_locations_sz \
419 				(compound_decode_hdr_maxsz + \
420 				 decode_putfh_maxsz + \
421 				 op_decode_hdr_maxsz + \
422 				 nfs4_fattr_bitmap_maxsz)
423 
424 static struct {
425 	unsigned int	mode;
426 	unsigned int	nfs2type;
427 } nfs_type2fmt[] = {
428 	{ 0,		NFNON	     },
429 	{ S_IFREG,	NFREG	     },
430 	{ S_IFDIR,	NFDIR	     },
431 	{ S_IFBLK,	NFBLK	     },
432 	{ S_IFCHR,	NFCHR	     },
433 	{ S_IFLNK,	NFLNK	     },
434 	{ S_IFSOCK,	NFSOCK	     },
435 	{ S_IFIFO,	NFFIFO	     },
436 	{ 0,		NFNON	     },
437 	{ 0,		NFNON	     },
438 };
439 
440 struct compound_hdr {
441 	int32_t		status;
442 	uint32_t	nops;
443 	uint32_t	taglen;
444 	char *		tag;
445 };
446 
447 /*
448  * START OF "GENERIC" ENCODE ROUTINES.
449  *   These may look a little ugly since they are imported from a "generic"
450  * set of XDR encode/decode routines which are intended to be shared by
451  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
452  *
453  * If the pain of reading these is too great, it should be a straightforward
454  * task to translate them into Linux-specific versions which are more
455  * consistent with the style used in NFSv2/v3...
456  */
457 #define WRITE32(n)               *p++ = htonl(n)
458 #define WRITE64(n)               do {				\
459 	*p++ = htonl((uint32_t)((n) >> 32));				\
460 	*p++ = htonl((uint32_t)(n));					\
461 } while (0)
462 #define WRITEMEM(ptr,nbytes)     do {				\
463 	p = xdr_encode_opaque_fixed(p, ptr, nbytes);		\
464 } while (0)
465 
466 #define RESERVE_SPACE(nbytes)	do {				\
467 	p = xdr_reserve_space(xdr, nbytes);			\
468 	if (!p) printk("RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \
469 	BUG_ON(!p);						\
470 } while (0)
471 
472 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
473 {
474 	uint32_t *p;
475 
476 	p = xdr_reserve_space(xdr, 4 + len);
477 	BUG_ON(p == NULL);
478 	xdr_encode_opaque(p, str, len);
479 }
480 
481 static int encode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
482 {
483 	uint32_t *p;
484 
485 	dprintk("encode_compound: tag=%.*s\n", (int)hdr->taglen, hdr->tag);
486 	BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
487 	RESERVE_SPACE(12+(XDR_QUADLEN(hdr->taglen)<<2));
488 	WRITE32(hdr->taglen);
489 	WRITEMEM(hdr->tag, hdr->taglen);
490 	WRITE32(NFS4_MINOR_VERSION);
491 	WRITE32(hdr->nops);
492 	return 0;
493 }
494 
495 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
496 {
497 	uint32_t *p;
498 
499 	p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
500 	BUG_ON(p == NULL);
501 	xdr_encode_opaque_fixed(p, verf->data, NFS4_VERIFIER_SIZE);
502 }
503 
504 static int encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
505 {
506 	char owner_name[IDMAP_NAMESZ];
507 	char owner_group[IDMAP_NAMESZ];
508 	int owner_namelen = 0;
509 	int owner_grouplen = 0;
510 	uint32_t *p;
511 	uint32_t *q;
512 	int len;
513 	uint32_t bmval0 = 0;
514 	uint32_t bmval1 = 0;
515 	int status;
516 
517 	/*
518 	 * We reserve enough space to write the entire attribute buffer at once.
519 	 * In the worst-case, this would be
520 	 *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
521 	 *          = 36 bytes, plus any contribution from variable-length fields
522 	 *            such as owner/group.
523 	 */
524 	len = 16;
525 
526 	/* Sigh */
527 	if (iap->ia_valid & ATTR_SIZE)
528 		len += 8;
529 	if (iap->ia_valid & ATTR_MODE)
530 		len += 4;
531 	if (iap->ia_valid & ATTR_UID) {
532 		owner_namelen = nfs_map_uid_to_name(server->nfs4_state, iap->ia_uid, owner_name);
533 		if (owner_namelen < 0) {
534 			printk(KERN_WARNING "nfs: couldn't resolve uid %d to string\n",
535 			       iap->ia_uid);
536 			/* XXX */
537 			strcpy(owner_name, "nobody");
538 			owner_namelen = sizeof("nobody") - 1;
539 			/* goto out; */
540 		}
541 		len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
542 	}
543 	if (iap->ia_valid & ATTR_GID) {
544 		owner_grouplen = nfs_map_gid_to_group(server->nfs4_state, iap->ia_gid, owner_group);
545 		if (owner_grouplen < 0) {
546 			printk(KERN_WARNING "nfs4: couldn't resolve gid %d to string\n",
547 			       iap->ia_gid);
548 			strcpy(owner_group, "nobody");
549 			owner_grouplen = sizeof("nobody") - 1;
550 			/* goto out; */
551 		}
552 		len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
553 	}
554 	if (iap->ia_valid & ATTR_ATIME_SET)
555 		len += 16;
556 	else if (iap->ia_valid & ATTR_ATIME)
557 		len += 4;
558 	if (iap->ia_valid & ATTR_MTIME_SET)
559 		len += 16;
560 	else if (iap->ia_valid & ATTR_MTIME)
561 		len += 4;
562 	RESERVE_SPACE(len);
563 
564 	/*
565 	 * We write the bitmap length now, but leave the bitmap and the attribute
566 	 * buffer length to be backfilled at the end of this routine.
567 	 */
568 	WRITE32(2);
569 	q = p;
570 	p += 3;
571 
572 	if (iap->ia_valid & ATTR_SIZE) {
573 		bmval0 |= FATTR4_WORD0_SIZE;
574 		WRITE64(iap->ia_size);
575 	}
576 	if (iap->ia_valid & ATTR_MODE) {
577 		bmval1 |= FATTR4_WORD1_MODE;
578 		WRITE32(iap->ia_mode & S_IALLUGO);
579 	}
580 	if (iap->ia_valid & ATTR_UID) {
581 		bmval1 |= FATTR4_WORD1_OWNER;
582 		WRITE32(owner_namelen);
583 		WRITEMEM(owner_name, owner_namelen);
584 	}
585 	if (iap->ia_valid & ATTR_GID) {
586 		bmval1 |= FATTR4_WORD1_OWNER_GROUP;
587 		WRITE32(owner_grouplen);
588 		WRITEMEM(owner_group, owner_grouplen);
589 	}
590 	if (iap->ia_valid & ATTR_ATIME_SET) {
591 		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
592 		WRITE32(NFS4_SET_TO_CLIENT_TIME);
593 		WRITE32(0);
594 		WRITE32(iap->ia_mtime.tv_sec);
595 		WRITE32(iap->ia_mtime.tv_nsec);
596 	}
597 	else if (iap->ia_valid & ATTR_ATIME) {
598 		bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
599 		WRITE32(NFS4_SET_TO_SERVER_TIME);
600 	}
601 	if (iap->ia_valid & ATTR_MTIME_SET) {
602 		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
603 		WRITE32(NFS4_SET_TO_CLIENT_TIME);
604 		WRITE32(0);
605 		WRITE32(iap->ia_mtime.tv_sec);
606 		WRITE32(iap->ia_mtime.tv_nsec);
607 	}
608 	else if (iap->ia_valid & ATTR_MTIME) {
609 		bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
610 		WRITE32(NFS4_SET_TO_SERVER_TIME);
611 	}
612 
613 	/*
614 	 * Now we backfill the bitmap and the attribute buffer length.
615 	 */
616 	if (len != ((char *)p - (char *)q) + 4) {
617 		printk ("encode_attr: Attr length calculation error! %u != %Zu\n",
618 				len, ((char *)p - (char *)q) + 4);
619 		BUG();
620 	}
621 	len = (char *)p - (char *)q - 12;
622 	*q++ = htonl(bmval0);
623 	*q++ = htonl(bmval1);
624 	*q++ = htonl(len);
625 
626 	status = 0;
627 /* out: */
628 	return status;
629 }
630 
631 static int encode_access(struct xdr_stream *xdr, u32 access)
632 {
633 	uint32_t *p;
634 
635 	RESERVE_SPACE(8);
636 	WRITE32(OP_ACCESS);
637 	WRITE32(access);
638 
639 	return 0;
640 }
641 
642 static int encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg)
643 {
644 	uint32_t *p;
645 
646 	RESERVE_SPACE(8+sizeof(arg->stateid->data));
647 	WRITE32(OP_CLOSE);
648 	WRITE32(arg->seqid->sequence->counter);
649 	WRITEMEM(arg->stateid->data, sizeof(arg->stateid->data));
650 
651 	return 0;
652 }
653 
654 static int encode_commit(struct xdr_stream *xdr, const struct nfs_writeargs *args)
655 {
656 	uint32_t *p;
657 
658         RESERVE_SPACE(16);
659         WRITE32(OP_COMMIT);
660         WRITE64(args->offset);
661         WRITE32(args->count);
662 
663         return 0;
664 }
665 
666 static int encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create)
667 {
668 	uint32_t *p;
669 
670 	RESERVE_SPACE(8);
671 	WRITE32(OP_CREATE);
672 	WRITE32(create->ftype);
673 
674 	switch (create->ftype) {
675 	case NF4LNK:
676 		RESERVE_SPACE(4 + create->u.symlink->len);
677 		WRITE32(create->u.symlink->len);
678 		WRITEMEM(create->u.symlink->name, create->u.symlink->len);
679 		break;
680 
681 	case NF4BLK: case NF4CHR:
682 		RESERVE_SPACE(8);
683 		WRITE32(create->u.device.specdata1);
684 		WRITE32(create->u.device.specdata2);
685 		break;
686 
687 	default:
688 		break;
689 	}
690 
691 	RESERVE_SPACE(4 + create->name->len);
692 	WRITE32(create->name->len);
693 	WRITEMEM(create->name->name, create->name->len);
694 
695 	return encode_attrs(xdr, create->attrs, create->server);
696 }
697 
698 static int encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap)
699 {
700         uint32_t *p;
701 
702         RESERVE_SPACE(12);
703         WRITE32(OP_GETATTR);
704         WRITE32(1);
705         WRITE32(bitmap);
706         return 0;
707 }
708 
709 static int encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1)
710 {
711         uint32_t *p;
712 
713         RESERVE_SPACE(16);
714         WRITE32(OP_GETATTR);
715         WRITE32(2);
716         WRITE32(bm0);
717         WRITE32(bm1);
718         return 0;
719 }
720 
721 static int encode_getfattr(struct xdr_stream *xdr, const u32* bitmask)
722 {
723 	return encode_getattr_two(xdr,
724 			bitmask[0] & nfs4_fattr_bitmap[0],
725 			bitmask[1] & nfs4_fattr_bitmap[1]);
726 }
727 
728 static int encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask)
729 {
730 	return encode_getattr_two(xdr, bitmask[0] & nfs4_fsinfo_bitmap[0],
731 			bitmask[1] & nfs4_fsinfo_bitmap[1]);
732 }
733 
734 static int encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask)
735 {
736 	return encode_getattr_two(xdr,
737 				  bitmask[0] & nfs4_fs_locations_bitmap[0],
738 				  bitmask[1] & nfs4_fs_locations_bitmap[1]);
739 }
740 
741 static int encode_getfh(struct xdr_stream *xdr)
742 {
743 	uint32_t *p;
744 
745 	RESERVE_SPACE(4);
746 	WRITE32(OP_GETFH);
747 
748 	return 0;
749 }
750 
751 static int encode_link(struct xdr_stream *xdr, const struct qstr *name)
752 {
753 	uint32_t *p;
754 
755 	RESERVE_SPACE(8 + name->len);
756 	WRITE32(OP_LINK);
757 	WRITE32(name->len);
758 	WRITEMEM(name->name, name->len);
759 
760 	return 0;
761 }
762 
763 static inline int nfs4_lock_type(struct file_lock *fl, int block)
764 {
765 	if ((fl->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) == F_RDLCK)
766 		return block ? NFS4_READW_LT : NFS4_READ_LT;
767 	return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
768 }
769 
770 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
771 {
772 	if (fl->fl_end == OFFSET_MAX)
773 		return ~(uint64_t)0;
774 	return fl->fl_end - fl->fl_start + 1;
775 }
776 
777 /*
778  * opcode,type,reclaim,offset,length,new_lock_owner = 32
779  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
780  */
781 static int encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args)
782 {
783 	uint32_t *p;
784 
785 	RESERVE_SPACE(32);
786 	WRITE32(OP_LOCK);
787 	WRITE32(nfs4_lock_type(args->fl, args->block));
788 	WRITE32(args->reclaim);
789 	WRITE64(args->fl->fl_start);
790 	WRITE64(nfs4_lock_length(args->fl));
791 	WRITE32(args->new_lock_owner);
792 	if (args->new_lock_owner){
793 		RESERVE_SPACE(40);
794 		WRITE32(args->open_seqid->sequence->counter);
795 		WRITEMEM(args->open_stateid->data, sizeof(args->open_stateid->data));
796 		WRITE32(args->lock_seqid->sequence->counter);
797 		WRITE64(args->lock_owner.clientid);
798 		WRITE32(4);
799 		WRITE32(args->lock_owner.id);
800 	}
801 	else {
802 		RESERVE_SPACE(20);
803 		WRITEMEM(args->lock_stateid->data, sizeof(args->lock_stateid->data));
804 		WRITE32(args->lock_seqid->sequence->counter);
805 	}
806 
807 	return 0;
808 }
809 
810 static int encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args)
811 {
812 	uint32_t *p;
813 
814 	RESERVE_SPACE(40);
815 	WRITE32(OP_LOCKT);
816 	WRITE32(nfs4_lock_type(args->fl, 0));
817 	WRITE64(args->fl->fl_start);
818 	WRITE64(nfs4_lock_length(args->fl));
819 	WRITE64(args->lock_owner.clientid);
820 	WRITE32(4);
821 	WRITE32(args->lock_owner.id);
822 
823 	return 0;
824 }
825 
826 static int encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args)
827 {
828 	uint32_t *p;
829 
830 	RESERVE_SPACE(44);
831 	WRITE32(OP_LOCKU);
832 	WRITE32(nfs4_lock_type(args->fl, 0));
833 	WRITE32(args->seqid->sequence->counter);
834 	WRITEMEM(args->stateid->data, sizeof(args->stateid->data));
835 	WRITE64(args->fl->fl_start);
836 	WRITE64(nfs4_lock_length(args->fl));
837 
838 	return 0;
839 }
840 
841 static int encode_lookup(struct xdr_stream *xdr, const struct qstr *name)
842 {
843 	int len = name->len;
844 	uint32_t *p;
845 
846 	RESERVE_SPACE(8 + len);
847 	WRITE32(OP_LOOKUP);
848 	WRITE32(len);
849 	WRITEMEM(name->name, len);
850 
851 	return 0;
852 }
853 
854 static void encode_share_access(struct xdr_stream *xdr, int open_flags)
855 {
856 	uint32_t *p;
857 
858 	RESERVE_SPACE(8);
859 	switch (open_flags & (FMODE_READ|FMODE_WRITE)) {
860 		case FMODE_READ:
861 			WRITE32(NFS4_SHARE_ACCESS_READ);
862 			break;
863 		case FMODE_WRITE:
864 			WRITE32(NFS4_SHARE_ACCESS_WRITE);
865 			break;
866 		case FMODE_READ|FMODE_WRITE:
867 			WRITE32(NFS4_SHARE_ACCESS_BOTH);
868 			break;
869 		default:
870 			BUG();
871 	}
872 	WRITE32(0);		/* for linux, share_deny = 0 always */
873 }
874 
875 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
876 {
877 	uint32_t *p;
878  /*
879  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
880  * owner 4 = 32
881  */
882 	RESERVE_SPACE(8);
883 	WRITE32(OP_OPEN);
884 	WRITE32(arg->seqid->sequence->counter);
885 	encode_share_access(xdr, arg->open_flags);
886 	RESERVE_SPACE(16);
887 	WRITE64(arg->clientid);
888 	WRITE32(4);
889 	WRITE32(arg->id);
890 }
891 
892 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
893 {
894 	uint32_t *p;
895 
896 	RESERVE_SPACE(4);
897 	switch(arg->open_flags & O_EXCL) {
898 		case 0:
899 			WRITE32(NFS4_CREATE_UNCHECKED);
900 			encode_attrs(xdr, arg->u.attrs, arg->server);
901 			break;
902 		default:
903 			WRITE32(NFS4_CREATE_EXCLUSIVE);
904 			encode_nfs4_verifier(xdr, &arg->u.verifier);
905 	}
906 }
907 
908 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
909 {
910 	uint32_t *p;
911 
912 	RESERVE_SPACE(4);
913 	switch (arg->open_flags & O_CREAT) {
914 		case 0:
915 			WRITE32(NFS4_OPEN_NOCREATE);
916 			break;
917 		default:
918 			BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
919 			WRITE32(NFS4_OPEN_CREATE);
920 			encode_createmode(xdr, arg);
921 	}
922 }
923 
924 static inline void encode_delegation_type(struct xdr_stream *xdr, int delegation_type)
925 {
926 	uint32_t *p;
927 
928 	RESERVE_SPACE(4);
929 	switch (delegation_type) {
930 		case 0:
931 			WRITE32(NFS4_OPEN_DELEGATE_NONE);
932 			break;
933 		case FMODE_READ:
934 			WRITE32(NFS4_OPEN_DELEGATE_READ);
935 			break;
936 		case FMODE_WRITE|FMODE_READ:
937 			WRITE32(NFS4_OPEN_DELEGATE_WRITE);
938 			break;
939 		default:
940 			BUG();
941 	}
942 }
943 
944 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
945 {
946 	uint32_t *p;
947 
948 	RESERVE_SPACE(4);
949 	WRITE32(NFS4_OPEN_CLAIM_NULL);
950 	encode_string(xdr, name->len, name->name);
951 }
952 
953 static inline void encode_claim_previous(struct xdr_stream *xdr, int type)
954 {
955 	uint32_t *p;
956 
957 	RESERVE_SPACE(4);
958 	WRITE32(NFS4_OPEN_CLAIM_PREVIOUS);
959 	encode_delegation_type(xdr, type);
960 }
961 
962 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
963 {
964 	uint32_t *p;
965 
966 	RESERVE_SPACE(4+sizeof(stateid->data));
967 	WRITE32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
968 	WRITEMEM(stateid->data, sizeof(stateid->data));
969 	encode_string(xdr, name->len, name->name);
970 }
971 
972 static int encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg)
973 {
974 	encode_openhdr(xdr, arg);
975 	encode_opentype(xdr, arg);
976 	switch (arg->claim) {
977 		case NFS4_OPEN_CLAIM_NULL:
978 			encode_claim_null(xdr, arg->name);
979 			break;
980 		case NFS4_OPEN_CLAIM_PREVIOUS:
981 			encode_claim_previous(xdr, arg->u.delegation_type);
982 			break;
983 		case NFS4_OPEN_CLAIM_DELEGATE_CUR:
984 			encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
985 			break;
986 		default:
987 			BUG();
988 	}
989 	return 0;
990 }
991 
992 static int encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg)
993 {
994 	uint32_t *p;
995 
996 	RESERVE_SPACE(8+sizeof(arg->stateid->data));
997 	WRITE32(OP_OPEN_CONFIRM);
998 	WRITEMEM(arg->stateid->data, sizeof(arg->stateid->data));
999 	WRITE32(arg->seqid->sequence->counter);
1000 
1001 	return 0;
1002 }
1003 
1004 static int encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg)
1005 {
1006 	uint32_t *p;
1007 
1008 	RESERVE_SPACE(8+sizeof(arg->stateid->data));
1009 	WRITE32(OP_OPEN_DOWNGRADE);
1010 	WRITEMEM(arg->stateid->data, sizeof(arg->stateid->data));
1011 	WRITE32(arg->seqid->sequence->counter);
1012 	encode_share_access(xdr, arg->open_flags);
1013 	return 0;
1014 }
1015 
1016 static int
1017 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh)
1018 {
1019 	int len = fh->size;
1020 	uint32_t *p;
1021 
1022 	RESERVE_SPACE(8 + len);
1023 	WRITE32(OP_PUTFH);
1024 	WRITE32(len);
1025 	WRITEMEM(fh->data, len);
1026 
1027 	return 0;
1028 }
1029 
1030 static int encode_putrootfh(struct xdr_stream *xdr)
1031 {
1032         uint32_t *p;
1033 
1034         RESERVE_SPACE(4);
1035         WRITE32(OP_PUTROOTFH);
1036 
1037         return 0;
1038 }
1039 
1040 static void encode_stateid(struct xdr_stream *xdr, const struct nfs_open_context *ctx)
1041 {
1042 	nfs4_stateid stateid;
1043 	uint32_t *p;
1044 
1045 	RESERVE_SPACE(16);
1046 	if (ctx->state != NULL) {
1047 		nfs4_copy_stateid(&stateid, ctx->state, ctx->lockowner);
1048 		WRITEMEM(stateid.data, sizeof(stateid.data));
1049 	} else
1050 		WRITEMEM(zero_stateid.data, sizeof(zero_stateid.data));
1051 }
1052 
1053 static int encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args)
1054 {
1055 	uint32_t *p;
1056 
1057 	RESERVE_SPACE(4);
1058 	WRITE32(OP_READ);
1059 
1060 	encode_stateid(xdr, args->context);
1061 
1062 	RESERVE_SPACE(12);
1063 	WRITE64(args->offset);
1064 	WRITE32(args->count);
1065 
1066 	return 0;
1067 }
1068 
1069 static int encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req)
1070 {
1071 	struct rpc_auth *auth = req->rq_task->tk_auth;
1072 	uint32_t attrs[2] = {
1073 		FATTR4_WORD0_RDATTR_ERROR|FATTR4_WORD0_FILEID,
1074 		FATTR4_WORD1_MOUNTED_ON_FILEID,
1075 	};
1076 	int replen;
1077 	uint32_t *p;
1078 
1079 	RESERVE_SPACE(32+sizeof(nfs4_verifier));
1080 	WRITE32(OP_READDIR);
1081 	WRITE64(readdir->cookie);
1082 	WRITEMEM(readdir->verifier.data, sizeof(readdir->verifier.data));
1083 	WRITE32(readdir->count >> 1);  /* We're not doing readdirplus */
1084 	WRITE32(readdir->count);
1085 	WRITE32(2);
1086 	/* Switch to mounted_on_fileid if the server supports it */
1087 	if (readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
1088 		attrs[0] &= ~FATTR4_WORD0_FILEID;
1089 	else
1090 		attrs[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
1091 	WRITE32(attrs[0] & readdir->bitmask[0]);
1092 	WRITE32(attrs[1] & readdir->bitmask[1]);
1093 	dprintk("%s: cookie = %Lu, verifier = 0x%x%x, bitmap = 0x%x%x\n",
1094 			__FUNCTION__,
1095 			(unsigned long long)readdir->cookie,
1096 			((u32 *)readdir->verifier.data)[0],
1097 			((u32 *)readdir->verifier.data)[1],
1098 			attrs[0] & readdir->bitmask[0],
1099 			attrs[1] & readdir->bitmask[1]);
1100 
1101 	/* set up reply kvec
1102 	 *    toplevel_status + taglen + rescount + OP_PUTFH + status
1103 	 *      + OP_READDIR + status + verifer(2)  = 9
1104 	 */
1105 	replen = (RPC_REPHDRSIZE + auth->au_rslack + 9) << 2;
1106 	xdr_inline_pages(&req->rq_rcv_buf, replen, readdir->pages,
1107 			 readdir->pgbase, readdir->count);
1108 	dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
1109 			__FUNCTION__, replen, readdir->pages,
1110 			readdir->pgbase, readdir->count);
1111 
1112 	return 0;
1113 }
1114 
1115 static int encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req)
1116 {
1117 	struct rpc_auth *auth = req->rq_task->tk_auth;
1118 	unsigned int replen;
1119 	uint32_t *p;
1120 
1121 	RESERVE_SPACE(4);
1122 	WRITE32(OP_READLINK);
1123 
1124 	/* set up reply kvec
1125 	 *    toplevel_status + taglen + rescount + OP_PUTFH + status
1126 	 *      + OP_READLINK + status + string length = 8
1127 	 */
1128 	replen = (RPC_REPHDRSIZE + auth->au_rslack + 8) << 2;
1129 	xdr_inline_pages(&req->rq_rcv_buf, replen, readlink->pages,
1130 			readlink->pgbase, readlink->pglen);
1131 
1132 	return 0;
1133 }
1134 
1135 static int encode_remove(struct xdr_stream *xdr, const struct qstr *name)
1136 {
1137 	uint32_t *p;
1138 
1139 	RESERVE_SPACE(8 + name->len);
1140 	WRITE32(OP_REMOVE);
1141 	WRITE32(name->len);
1142 	WRITEMEM(name->name, name->len);
1143 
1144 	return 0;
1145 }
1146 
1147 static int encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname)
1148 {
1149 	uint32_t *p;
1150 
1151 	RESERVE_SPACE(8 + oldname->len);
1152 	WRITE32(OP_RENAME);
1153 	WRITE32(oldname->len);
1154 	WRITEMEM(oldname->name, oldname->len);
1155 
1156 	RESERVE_SPACE(4 + newname->len);
1157 	WRITE32(newname->len);
1158 	WRITEMEM(newname->name, newname->len);
1159 
1160 	return 0;
1161 }
1162 
1163 static int encode_renew(struct xdr_stream *xdr, const struct nfs4_client *client_stateid)
1164 {
1165 	uint32_t *p;
1166 
1167 	RESERVE_SPACE(12);
1168 	WRITE32(OP_RENEW);
1169 	WRITE64(client_stateid->cl_clientid);
1170 
1171 	return 0;
1172 }
1173 
1174 static int
1175 encode_restorefh(struct xdr_stream *xdr)
1176 {
1177 	uint32_t *p;
1178 
1179 	RESERVE_SPACE(4);
1180 	WRITE32(OP_RESTOREFH);
1181 
1182 	return 0;
1183 }
1184 
1185 static int
1186 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg)
1187 {
1188 	uint32_t *p;
1189 
1190 	RESERVE_SPACE(4+sizeof(zero_stateid.data));
1191 	WRITE32(OP_SETATTR);
1192 	WRITEMEM(zero_stateid.data, sizeof(zero_stateid.data));
1193 	RESERVE_SPACE(2*4);
1194 	WRITE32(1);
1195 	WRITE32(FATTR4_WORD0_ACL);
1196 	if (arg->acl_len % 4)
1197 		return -EINVAL;
1198 	RESERVE_SPACE(4);
1199 	WRITE32(arg->acl_len);
1200 	xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1201 	return 0;
1202 }
1203 
1204 static int
1205 encode_savefh(struct xdr_stream *xdr)
1206 {
1207 	uint32_t *p;
1208 
1209 	RESERVE_SPACE(4);
1210 	WRITE32(OP_SAVEFH);
1211 
1212 	return 0;
1213 }
1214 
1215 static int encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server)
1216 {
1217 	int status;
1218 	uint32_t *p;
1219 
1220         RESERVE_SPACE(4+sizeof(arg->stateid.data));
1221         WRITE32(OP_SETATTR);
1222 	WRITEMEM(arg->stateid.data, sizeof(arg->stateid.data));
1223 
1224         if ((status = encode_attrs(xdr, arg->iap, server)))
1225 		return status;
1226 
1227         return 0;
1228 }
1229 
1230 static int encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid)
1231 {
1232 	uint32_t *p;
1233 
1234 	RESERVE_SPACE(4 + sizeof(setclientid->sc_verifier->data));
1235 	WRITE32(OP_SETCLIENTID);
1236 	WRITEMEM(setclientid->sc_verifier->data, sizeof(setclientid->sc_verifier->data));
1237 
1238 	encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1239 	RESERVE_SPACE(4);
1240 	WRITE32(setclientid->sc_prog);
1241 	encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1242 	encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1243 	RESERVE_SPACE(4);
1244 	WRITE32(setclientid->sc_cb_ident);
1245 
1246 	return 0;
1247 }
1248 
1249 static int encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_client *client_state)
1250 {
1251         uint32_t *p;
1252 
1253         RESERVE_SPACE(12 + sizeof(client_state->cl_confirm.data));
1254         WRITE32(OP_SETCLIENTID_CONFIRM);
1255         WRITE64(client_state->cl_clientid);
1256         WRITEMEM(client_state->cl_confirm.data, sizeof(client_state->cl_confirm.data));
1257 
1258         return 0;
1259 }
1260 
1261 static int encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args)
1262 {
1263 	uint32_t *p;
1264 
1265 	RESERVE_SPACE(4);
1266 	WRITE32(OP_WRITE);
1267 
1268 	encode_stateid(xdr, args->context);
1269 
1270 	RESERVE_SPACE(16);
1271 	WRITE64(args->offset);
1272 	WRITE32(args->stable);
1273 	WRITE32(args->count);
1274 
1275 	xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1276 
1277 	return 0;
1278 }
1279 
1280 static int encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1281 {
1282 	uint32_t *p;
1283 
1284 	RESERVE_SPACE(20);
1285 
1286 	WRITE32(OP_DELEGRETURN);
1287 	WRITEMEM(stateid->data, sizeof(stateid->data));
1288 	return 0;
1289 
1290 }
1291 /*
1292  * END OF "GENERIC" ENCODE ROUTINES.
1293  */
1294 
1295 /*
1296  * Encode an ACCESS request
1297  */
1298 static int nfs4_xdr_enc_access(struct rpc_rqst *req, uint32_t *p, const struct nfs4_accessargs *args)
1299 {
1300 	struct xdr_stream xdr;
1301 	struct compound_hdr hdr = {
1302 		.nops = 2,
1303 	};
1304 	int status;
1305 
1306 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1307 	encode_compound_hdr(&xdr, &hdr);
1308 	if ((status = encode_putfh(&xdr, args->fh)) == 0)
1309 		status = encode_access(&xdr, args->access);
1310 	return status;
1311 }
1312 
1313 /*
1314  * Encode LOOKUP request
1315  */
1316 static int nfs4_xdr_enc_lookup(struct rpc_rqst *req, uint32_t *p, const struct nfs4_lookup_arg *args)
1317 {
1318 	struct xdr_stream xdr;
1319 	struct compound_hdr hdr = {
1320 		.nops = 4,
1321 	};
1322 	int status;
1323 
1324 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1325 	encode_compound_hdr(&xdr, &hdr);
1326 	if ((status = encode_putfh(&xdr, args->dir_fh)) != 0)
1327 		goto out;
1328 	if ((status = encode_lookup(&xdr, args->name)) != 0)
1329 		goto out;
1330 	if ((status = encode_getfh(&xdr)) != 0)
1331 		goto out;
1332 	status = encode_getfattr(&xdr, args->bitmask);
1333 out:
1334 	return status;
1335 }
1336 
1337 /*
1338  * Encode LOOKUP_ROOT request
1339  */
1340 static int nfs4_xdr_enc_lookup_root(struct rpc_rqst *req, uint32_t *p, const struct nfs4_lookup_root_arg *args)
1341 {
1342 	struct xdr_stream xdr;
1343 	struct compound_hdr hdr = {
1344 		.nops = 3,
1345 	};
1346 	int status;
1347 
1348 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1349 	encode_compound_hdr(&xdr, &hdr);
1350 	if ((status = encode_putrootfh(&xdr)) != 0)
1351 		goto out;
1352 	if ((status = encode_getfh(&xdr)) == 0)
1353 		status = encode_getfattr(&xdr, args->bitmask);
1354 out:
1355 	return status;
1356 }
1357 
1358 /*
1359  * Encode REMOVE request
1360  */
1361 static int nfs4_xdr_enc_remove(struct rpc_rqst *req, uint32_t *p, const struct nfs4_remove_arg *args)
1362 {
1363 	struct xdr_stream xdr;
1364 	struct compound_hdr hdr = {
1365 		.nops = 3,
1366 	};
1367 	int status;
1368 
1369 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1370 	encode_compound_hdr(&xdr, &hdr);
1371 	if ((status = encode_putfh(&xdr, args->fh)) != 0)
1372 		goto out;
1373 	if ((status = encode_remove(&xdr, args->name)) != 0)
1374 		goto out;
1375 	status = encode_getfattr(&xdr, args->bitmask);
1376 out:
1377 	return status;
1378 }
1379 
1380 /*
1381  * Encode RENAME request
1382  */
1383 static int nfs4_xdr_enc_rename(struct rpc_rqst *req, uint32_t *p, const struct nfs4_rename_arg *args)
1384 {
1385 	struct xdr_stream xdr;
1386 	struct compound_hdr hdr = {
1387 		.nops = 7,
1388 	};
1389 	int status;
1390 
1391 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1392 	encode_compound_hdr(&xdr, &hdr);
1393 	if ((status = encode_putfh(&xdr, args->old_dir)) != 0)
1394 		goto out;
1395 	if ((status = encode_savefh(&xdr)) != 0)
1396 		goto out;
1397 	if ((status = encode_putfh(&xdr, args->new_dir)) != 0)
1398 		goto out;
1399 	if ((status = encode_rename(&xdr, args->old_name, args->new_name)) != 0)
1400 		goto out;
1401 	if ((status = encode_getfattr(&xdr, args->bitmask)) != 0)
1402 		goto out;
1403 	if ((status = encode_restorefh(&xdr)) != 0)
1404 		goto out;
1405 	status = encode_getfattr(&xdr, args->bitmask);
1406 out:
1407 	return status;
1408 }
1409 
1410 /*
1411  * Encode LINK request
1412  */
1413 static int nfs4_xdr_enc_link(struct rpc_rqst *req, uint32_t *p, const struct nfs4_link_arg *args)
1414 {
1415 	struct xdr_stream xdr;
1416 	struct compound_hdr hdr = {
1417 		.nops = 7,
1418 	};
1419 	int status;
1420 
1421 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1422 	encode_compound_hdr(&xdr, &hdr);
1423 	if ((status = encode_putfh(&xdr, args->fh)) != 0)
1424 		goto out;
1425 	if ((status = encode_savefh(&xdr)) != 0)
1426 		goto out;
1427 	if ((status = encode_putfh(&xdr, args->dir_fh)) != 0)
1428 		goto out;
1429 	if ((status = encode_link(&xdr, args->name)) != 0)
1430 		goto out;
1431 	if ((status = encode_getfattr(&xdr, args->bitmask)) != 0)
1432 		goto out;
1433 	if ((status = encode_restorefh(&xdr)) != 0)
1434 		goto out;
1435 	status = encode_getfattr(&xdr, args->bitmask);
1436 out:
1437 	return status;
1438 }
1439 
1440 /*
1441  * Encode CREATE request
1442  */
1443 static int nfs4_xdr_enc_create(struct rpc_rqst *req, uint32_t *p, const struct nfs4_create_arg *args)
1444 {
1445 	struct xdr_stream xdr;
1446 	struct compound_hdr hdr = {
1447 		.nops = 7,
1448 	};
1449 	int status;
1450 
1451 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1452 	encode_compound_hdr(&xdr, &hdr);
1453 	if ((status = encode_putfh(&xdr, args->dir_fh)) != 0)
1454 		goto out;
1455 	if ((status = encode_savefh(&xdr)) != 0)
1456 		goto out;
1457 	if ((status = encode_create(&xdr, args)) != 0)
1458 		goto out;
1459 	if ((status = encode_getfh(&xdr)) != 0)
1460 		goto out;
1461 	if ((status = encode_getfattr(&xdr, args->bitmask)) != 0)
1462 		goto out;
1463 	if ((status = encode_restorefh(&xdr)) != 0)
1464 		goto out;
1465 	status = encode_getfattr(&xdr, args->bitmask);
1466 out:
1467 	return status;
1468 }
1469 
1470 /*
1471  * Encode SYMLINK request
1472  */
1473 static int nfs4_xdr_enc_symlink(struct rpc_rqst *req, uint32_t *p, const struct nfs4_create_arg *args)
1474 {
1475 	return nfs4_xdr_enc_create(req, p, args);
1476 }
1477 
1478 /*
1479  * Encode GETATTR request
1480  */
1481 static int nfs4_xdr_enc_getattr(struct rpc_rqst *req, uint32_t *p, const struct nfs4_getattr_arg *args)
1482 {
1483 	struct xdr_stream xdr;
1484 	struct compound_hdr hdr = {
1485 		.nops = 2,
1486 	};
1487 	int status;
1488 
1489 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1490 	encode_compound_hdr(&xdr, &hdr);
1491 	if ((status = encode_putfh(&xdr, args->fh)) == 0)
1492 		status = encode_getfattr(&xdr, args->bitmask);
1493 	return status;
1494 }
1495 
1496 /*
1497  * Encode a CLOSE request
1498  */
1499 static int nfs4_xdr_enc_close(struct rpc_rqst *req, uint32_t *p, struct nfs_closeargs *args)
1500 {
1501         struct xdr_stream xdr;
1502         struct compound_hdr hdr = {
1503                 .nops   = 3,
1504         };
1505         int status;
1506 
1507         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1508         encode_compound_hdr(&xdr, &hdr);
1509         status = encode_putfh(&xdr, args->fh);
1510         if(status)
1511                 goto out;
1512         status = encode_close(&xdr, args);
1513 	if (status != 0)
1514 		goto out;
1515 	status = encode_getfattr(&xdr, args->bitmask);
1516 out:
1517         return status;
1518 }
1519 
1520 /*
1521  * Encode an OPEN request
1522  */
1523 static int nfs4_xdr_enc_open(struct rpc_rqst *req, uint32_t *p, struct nfs_openargs *args)
1524 {
1525 	struct xdr_stream xdr;
1526 	struct compound_hdr hdr = {
1527 		.nops = 7,
1528 	};
1529 	int status;
1530 
1531 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1532 	encode_compound_hdr(&xdr, &hdr);
1533 	status = encode_putfh(&xdr, args->fh);
1534 	if (status)
1535 		goto out;
1536 	status = encode_savefh(&xdr);
1537 	if (status)
1538 		goto out;
1539 	status = encode_open(&xdr, args);
1540 	if (status)
1541 		goto out;
1542 	status = encode_getfh(&xdr);
1543 	if (status)
1544 		goto out;
1545 	status = encode_getfattr(&xdr, args->bitmask);
1546 	if (status)
1547 		goto out;
1548 	status = encode_restorefh(&xdr);
1549 	if (status)
1550 		goto out;
1551 	status = encode_getfattr(&xdr, args->bitmask);
1552 out:
1553 	return status;
1554 }
1555 
1556 /*
1557  * Encode an OPEN_CONFIRM request
1558  */
1559 static int nfs4_xdr_enc_open_confirm(struct rpc_rqst *req, uint32_t *p, struct nfs_open_confirmargs *args)
1560 {
1561 	struct xdr_stream xdr;
1562 	struct compound_hdr hdr = {
1563 		.nops   = 2,
1564 	};
1565 	int status;
1566 
1567 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1568 	encode_compound_hdr(&xdr, &hdr);
1569 	status = encode_putfh(&xdr, args->fh);
1570 	if(status)
1571 		goto out;
1572 	status = encode_open_confirm(&xdr, args);
1573 out:
1574 	return status;
1575 }
1576 
1577 /*
1578  * Encode an OPEN request with no attributes.
1579  */
1580 static int nfs4_xdr_enc_open_noattr(struct rpc_rqst *req, uint32_t *p, struct nfs_openargs *args)
1581 {
1582 	struct xdr_stream xdr;
1583 	struct compound_hdr hdr = {
1584 		.nops   = 3,
1585 	};
1586 	int status;
1587 
1588 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1589 	encode_compound_hdr(&xdr, &hdr);
1590 	status = encode_putfh(&xdr, args->fh);
1591 	if (status)
1592 		goto out;
1593 	status = encode_open(&xdr, args);
1594 	if (status)
1595 		goto out;
1596 	status = encode_getfattr(&xdr, args->bitmask);
1597 out:
1598 	return status;
1599 }
1600 
1601 /*
1602  * Encode an OPEN_DOWNGRADE request
1603  */
1604 static int nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req, uint32_t *p, struct nfs_closeargs *args)
1605 {
1606 	struct xdr_stream xdr;
1607 	struct compound_hdr hdr = {
1608 		.nops	= 3,
1609 	};
1610 	int status;
1611 
1612 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1613 	encode_compound_hdr(&xdr, &hdr);
1614 	status = encode_putfh(&xdr, args->fh);
1615 	if (status)
1616 		goto out;
1617 	status = encode_open_downgrade(&xdr, args);
1618 	if (status != 0)
1619 		goto out;
1620 	status = encode_getfattr(&xdr, args->bitmask);
1621 out:
1622 	return status;
1623 }
1624 
1625 /*
1626  * Encode a LOCK request
1627  */
1628 static int nfs4_xdr_enc_lock(struct rpc_rqst *req, uint32_t *p, struct nfs_lock_args *args)
1629 {
1630 	struct xdr_stream xdr;
1631 	struct compound_hdr hdr = {
1632 		.nops   = 2,
1633 	};
1634 	int status;
1635 
1636 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1637 	encode_compound_hdr(&xdr, &hdr);
1638 	status = encode_putfh(&xdr, args->fh);
1639 	if(status)
1640 		goto out;
1641 	status = encode_lock(&xdr, args);
1642 out:
1643 	return status;
1644 }
1645 
1646 /*
1647  * Encode a LOCKT request
1648  */
1649 static int nfs4_xdr_enc_lockt(struct rpc_rqst *req, uint32_t *p, struct nfs_lockt_args *args)
1650 {
1651 	struct xdr_stream xdr;
1652 	struct compound_hdr hdr = {
1653 		.nops   = 2,
1654 	};
1655 	int status;
1656 
1657 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1658 	encode_compound_hdr(&xdr, &hdr);
1659 	status = encode_putfh(&xdr, args->fh);
1660 	if(status)
1661 		goto out;
1662 	status = encode_lockt(&xdr, args);
1663 out:
1664 	return status;
1665 }
1666 
1667 /*
1668  * Encode a LOCKU request
1669  */
1670 static int nfs4_xdr_enc_locku(struct rpc_rqst *req, uint32_t *p, struct nfs_locku_args *args)
1671 {
1672 	struct xdr_stream xdr;
1673 	struct compound_hdr hdr = {
1674 		.nops   = 2,
1675 	};
1676 	int status;
1677 
1678 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1679 	encode_compound_hdr(&xdr, &hdr);
1680 	status = encode_putfh(&xdr, args->fh);
1681 	if(status)
1682 		goto out;
1683 	status = encode_locku(&xdr, args);
1684 out:
1685 	return status;
1686 }
1687 
1688 /*
1689  * Encode a READLINK request
1690  */
1691 static int nfs4_xdr_enc_readlink(struct rpc_rqst *req, uint32_t *p, const struct nfs4_readlink *args)
1692 {
1693 	struct xdr_stream xdr;
1694 	struct compound_hdr hdr = {
1695 		.nops = 2,
1696 	};
1697 	int status;
1698 
1699 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1700 	encode_compound_hdr(&xdr, &hdr);
1701 	status = encode_putfh(&xdr, args->fh);
1702 	if(status)
1703 		goto out;
1704 	status = encode_readlink(&xdr, args, req);
1705 out:
1706 	return status;
1707 }
1708 
1709 /*
1710  * Encode a READDIR request
1711  */
1712 static int nfs4_xdr_enc_readdir(struct rpc_rqst *req, uint32_t *p, const struct nfs4_readdir_arg *args)
1713 {
1714 	struct xdr_stream xdr;
1715 	struct compound_hdr hdr = {
1716 		.nops = 2,
1717 	};
1718 	int status;
1719 
1720 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1721 	encode_compound_hdr(&xdr, &hdr);
1722 	status = encode_putfh(&xdr, args->fh);
1723 	if(status)
1724 		goto out;
1725 	status = encode_readdir(&xdr, args, req);
1726 out:
1727 	return status;
1728 }
1729 
1730 /*
1731  * Encode a READ request
1732  */
1733 static int nfs4_xdr_enc_read(struct rpc_rqst *req, uint32_t *p, struct nfs_readargs *args)
1734 {
1735 	struct rpc_auth	*auth = req->rq_task->tk_auth;
1736 	struct xdr_stream xdr;
1737 	struct compound_hdr hdr = {
1738 		.nops = 2,
1739 	};
1740 	int replen, status;
1741 
1742 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1743 	encode_compound_hdr(&xdr, &hdr);
1744 	status = encode_putfh(&xdr, args->fh);
1745 	if (status)
1746 		goto out;
1747 	status = encode_read(&xdr, args);
1748 	if (status)
1749 		goto out;
1750 
1751 	/* set up reply kvec
1752 	 *    toplevel status + taglen=0 + rescount + OP_PUTFH + status
1753 	 *       + OP_READ + status + eof + datalen = 9
1754 	 */
1755 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_read_sz) << 2;
1756 	xdr_inline_pages(&req->rq_rcv_buf, replen,
1757 			 args->pages, args->pgbase, args->count);
1758 out:
1759 	return status;
1760 }
1761 
1762 /*
1763  * Encode an SETATTR request
1764  */
1765 static int nfs4_xdr_enc_setattr(struct rpc_rqst *req, uint32_t *p, struct nfs_setattrargs *args)
1766 
1767 {
1768         struct xdr_stream xdr;
1769         struct compound_hdr hdr = {
1770                 .nops   = 3,
1771         };
1772         int status;
1773 
1774         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1775         encode_compound_hdr(&xdr, &hdr);
1776         status = encode_putfh(&xdr, args->fh);
1777         if(status)
1778                 goto out;
1779         status = encode_setattr(&xdr, args, args->server);
1780         if(status)
1781                 goto out;
1782 	status = encode_getfattr(&xdr, args->bitmask);
1783 out:
1784         return status;
1785 }
1786 
1787 /*
1788  * Encode a GETACL request
1789  */
1790 static int
1791 nfs4_xdr_enc_getacl(struct rpc_rqst *req, uint32_t *p,
1792 		struct nfs_getaclargs *args)
1793 {
1794 	struct xdr_stream xdr;
1795 	struct rpc_auth *auth = req->rq_task->tk_auth;
1796 	struct compound_hdr hdr = {
1797 		.nops   = 2,
1798 	};
1799 	int replen, status;
1800 
1801 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1802 	encode_compound_hdr(&xdr, &hdr);
1803 	status = encode_putfh(&xdr, args->fh);
1804 	if (status)
1805 		goto out;
1806 	status = encode_getattr_two(&xdr, FATTR4_WORD0_ACL, 0);
1807 	/* set up reply buffer: */
1808 	replen = (RPC_REPHDRSIZE + auth->au_rslack + NFS4_dec_getacl_sz) << 2;
1809 	xdr_inline_pages(&req->rq_rcv_buf, replen,
1810 		args->acl_pages, args->acl_pgbase, args->acl_len);
1811 out:
1812 	return status;
1813 }
1814 
1815 /*
1816  * Encode a WRITE request
1817  */
1818 static int nfs4_xdr_enc_write(struct rpc_rqst *req, uint32_t *p, struct nfs_writeargs *args)
1819 {
1820 	struct xdr_stream xdr;
1821 	struct compound_hdr hdr = {
1822 		.nops = 3,
1823 	};
1824 	int status;
1825 
1826 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1827 	encode_compound_hdr(&xdr, &hdr);
1828 	status = encode_putfh(&xdr, args->fh);
1829 	if (status)
1830 		goto out;
1831 	status = encode_write(&xdr, args);
1832 	if (status)
1833 		goto out;
1834 	status = encode_getfattr(&xdr, args->bitmask);
1835 out:
1836 	return status;
1837 }
1838 
1839 /*
1840  *  a COMMIT request
1841  */
1842 static int nfs4_xdr_enc_commit(struct rpc_rqst *req, uint32_t *p, struct nfs_writeargs *args)
1843 {
1844 	struct xdr_stream xdr;
1845 	struct compound_hdr hdr = {
1846 		.nops = 3,
1847 	};
1848 	int status;
1849 
1850 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1851 	encode_compound_hdr(&xdr, &hdr);
1852 	status = encode_putfh(&xdr, args->fh);
1853 	if (status)
1854 		goto out;
1855 	status = encode_commit(&xdr, args);
1856 	if (status)
1857 		goto out;
1858 	status = encode_getfattr(&xdr, args->bitmask);
1859 out:
1860 	return status;
1861 }
1862 
1863 /*
1864  * FSINFO request
1865  */
1866 static int nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, uint32_t *p, struct nfs4_fsinfo_arg *args)
1867 {
1868 	struct xdr_stream xdr;
1869 	struct compound_hdr hdr = {
1870 		.nops	= 2,
1871 	};
1872 	int status;
1873 
1874 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1875 	encode_compound_hdr(&xdr, &hdr);
1876 	status = encode_putfh(&xdr, args->fh);
1877 	if (!status)
1878 		status = encode_fsinfo(&xdr, args->bitmask);
1879 	return status;
1880 }
1881 
1882 /*
1883  * a PATHCONF request
1884  */
1885 static int nfs4_xdr_enc_pathconf(struct rpc_rqst *req, uint32_t *p, const struct nfs4_pathconf_arg *args)
1886 {
1887 	struct xdr_stream xdr;
1888 	struct compound_hdr hdr = {
1889 		.nops = 2,
1890 	};
1891 	int status;
1892 
1893 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1894 	encode_compound_hdr(&xdr, &hdr);
1895 	status = encode_putfh(&xdr, args->fh);
1896 	if (!status)
1897 		status = encode_getattr_one(&xdr,
1898 				args->bitmask[0] & nfs4_pathconf_bitmap[0]);
1899 	return status;
1900 }
1901 
1902 /*
1903  * a STATFS request
1904  */
1905 static int nfs4_xdr_enc_statfs(struct rpc_rqst *req, uint32_t *p, const struct nfs4_statfs_arg *args)
1906 {
1907 	struct xdr_stream xdr;
1908 	struct compound_hdr hdr = {
1909 		.nops = 2,
1910 	};
1911 	int status;
1912 
1913 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1914 	encode_compound_hdr(&xdr, &hdr);
1915 	status = encode_putfh(&xdr, args->fh);
1916 	if (status == 0)
1917 		status = encode_getattr_two(&xdr,
1918 				args->bitmask[0] & nfs4_statfs_bitmap[0],
1919 				args->bitmask[1] & nfs4_statfs_bitmap[1]);
1920 	return status;
1921 }
1922 
1923 /*
1924  * GETATTR_BITMAP request
1925  */
1926 static int nfs4_xdr_enc_server_caps(struct rpc_rqst *req, uint32_t *p, const struct nfs_fh *fhandle)
1927 {
1928 	struct xdr_stream xdr;
1929 	struct compound_hdr hdr = {
1930 		.nops = 2,
1931 	};
1932 	int status;
1933 
1934 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1935 	encode_compound_hdr(&xdr, &hdr);
1936 	status = encode_putfh(&xdr, fhandle);
1937 	if (status == 0)
1938 		status = encode_getattr_one(&xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
1939 				FATTR4_WORD0_LINK_SUPPORT|
1940 				FATTR4_WORD0_SYMLINK_SUPPORT|
1941 				FATTR4_WORD0_ACLSUPPORT);
1942 	return status;
1943 }
1944 
1945 /*
1946  * a RENEW request
1947  */
1948 static int nfs4_xdr_enc_renew(struct rpc_rqst *req, uint32_t *p, struct nfs4_client *clp)
1949 {
1950 	struct xdr_stream xdr;
1951 	struct compound_hdr hdr = {
1952 		.nops	= 1,
1953 	};
1954 
1955 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1956 	encode_compound_hdr(&xdr, &hdr);
1957 	return encode_renew(&xdr, clp);
1958 }
1959 
1960 /*
1961  * a SETCLIENTID request
1962  */
1963 static int nfs4_xdr_enc_setclientid(struct rpc_rqst *req, uint32_t *p, struct nfs4_setclientid *sc)
1964 {
1965 	struct xdr_stream xdr;
1966 	struct compound_hdr hdr = {
1967 		.nops	= 1,
1968 	};
1969 
1970 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1971 	encode_compound_hdr(&xdr, &hdr);
1972 	return encode_setclientid(&xdr, sc);
1973 }
1974 
1975 /*
1976  * a SETCLIENTID_CONFIRM request
1977  */
1978 static int nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req, uint32_t *p, struct nfs4_client *clp)
1979 {
1980 	struct xdr_stream xdr;
1981 	struct compound_hdr hdr = {
1982 		.nops	= 3,
1983 	};
1984 	const u32 lease_bitmap[2] = { FATTR4_WORD0_LEASE_TIME, 0 };
1985 	int status;
1986 
1987 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
1988 	encode_compound_hdr(&xdr, &hdr);
1989 	status = encode_setclientid_confirm(&xdr, clp);
1990 	if (!status)
1991 		status = encode_putrootfh(&xdr);
1992 	if (!status)
1993 		status = encode_fsinfo(&xdr, lease_bitmap);
1994 	return status;
1995 }
1996 
1997 /*
1998  * DELEGRETURN request
1999  */
2000 static int nfs4_xdr_enc_delegreturn(struct rpc_rqst *req, uint32_t *p, const struct nfs4_delegreturnargs *args)
2001 {
2002 	struct xdr_stream xdr;
2003 	struct compound_hdr hdr = {
2004 		.nops = 3,
2005 	};
2006 	int status;
2007 
2008 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2009 	encode_compound_hdr(&xdr, &hdr);
2010 	status = encode_putfh(&xdr, args->fhandle);
2011 	if (status != 0)
2012 		goto out;
2013 	status = encode_delegreturn(&xdr, args->stateid);
2014 	if (status != 0)
2015 		goto out;
2016 	status = encode_getfattr(&xdr, args->bitmask);
2017 out:
2018 	return status;
2019 }
2020 
2021 /*
2022  * Encode FS_LOCATIONS request
2023  */
2024 static int nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, uint32_t *p, struct nfs4_fs_locations_arg *args)
2025 {
2026 	struct xdr_stream xdr;
2027 	struct compound_hdr hdr = {
2028 		.nops = 3,
2029 	};
2030 	struct rpc_auth *auth = req->rq_task->tk_auth;
2031 	int replen;
2032 	int status;
2033 
2034 	xdr_init_encode(&xdr, &req->rq_snd_buf, p);
2035 	encode_compound_hdr(&xdr, &hdr);
2036 	if ((status = encode_putfh(&xdr, args->dir_fh)) != 0)
2037 		goto out;
2038 	if ((status = encode_lookup(&xdr, args->name)) != 0)
2039 		goto out;
2040 	if ((status = encode_fs_locations(&xdr, args->bitmask)) != 0)
2041 		goto out;
2042 	/* set up reply
2043 	 *   toplevel_status + OP_PUTFH + status
2044 	 *   + OP_LOOKUP + status + OP_GETATTR + status = 7
2045 	 */
2046 	replen = (RPC_REPHDRSIZE + auth->au_rslack + 7) << 2;
2047 	xdr_inline_pages(&req->rq_rcv_buf, replen, &args->page,
2048 			0, PAGE_SIZE);
2049 out:
2050 	return status;
2051 }
2052 
2053 /*
2054  * START OF "GENERIC" DECODE ROUTINES.
2055  *   These may look a little ugly since they are imported from a "generic"
2056  * set of XDR encode/decode routines which are intended to be shared by
2057  * all of our NFSv4 implementations (OpenBSD, MacOS X...).
2058  *
2059  * If the pain of reading these is too great, it should be a straightforward
2060  * task to translate them into Linux-specific versions which are more
2061  * consistent with the style used in NFSv2/v3...
2062  */
2063 #define READ32(x)         (x) = ntohl(*p++)
2064 #define READ64(x)         do {			\
2065 	(x) = (u64)ntohl(*p++) << 32;		\
2066 	(x) |= ntohl(*p++);			\
2067 } while (0)
2068 #define READTIME(x)       do {			\
2069 	p++;					\
2070 	(x.tv_sec) = ntohl(*p++);		\
2071 	(x.tv_nsec) = ntohl(*p++);		\
2072 } while (0)
2073 #define COPYMEM(x,nbytes) do {			\
2074 	memcpy((x), p, nbytes);			\
2075 	p += XDR_QUADLEN(nbytes);		\
2076 } while (0)
2077 
2078 #define READ_BUF(nbytes)  do { \
2079 	p = xdr_inline_decode(xdr, nbytes); \
2080 	if (!p) { \
2081 		printk(KERN_WARNING "%s: reply buffer overflowed in line %d.", \
2082 			       	__FUNCTION__, __LINE__); \
2083 		return -EIO; \
2084 	} \
2085 } while (0)
2086 
2087 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
2088 {
2089 	uint32_t *p;
2090 
2091 	READ_BUF(4);
2092 	READ32(*len);
2093 	READ_BUF(*len);
2094 	*string = (char *)p;
2095 	return 0;
2096 }
2097 
2098 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
2099 {
2100 	uint32_t *p;
2101 
2102 	READ_BUF(8);
2103 	READ32(hdr->status);
2104 	READ32(hdr->taglen);
2105 
2106 	READ_BUF(hdr->taglen + 4);
2107 	hdr->tag = (char *)p;
2108 	p += XDR_QUADLEN(hdr->taglen);
2109 	READ32(hdr->nops);
2110 	return 0;
2111 }
2112 
2113 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
2114 {
2115 	uint32_t *p;
2116 	uint32_t opnum;
2117 	int32_t nfserr;
2118 
2119 	READ_BUF(8);
2120 	READ32(opnum);
2121 	if (opnum != expected) {
2122 		printk(KERN_NOTICE
2123 				"nfs4_decode_op_hdr: Server returned operation"
2124 			       	" %d but we issued a request for %d\n",
2125 				opnum, expected);
2126 		return -EIO;
2127 	}
2128 	READ32(nfserr);
2129 	if (nfserr != NFS_OK)
2130 		return -nfs_stat_to_errno(nfserr);
2131 	return 0;
2132 }
2133 
2134 /* Dummy routine */
2135 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs4_client *clp)
2136 {
2137 	uint32_t *p;
2138 	unsigned int strlen;
2139 	char *str;
2140 
2141 	READ_BUF(12);
2142 	return decode_opaque_inline(xdr, &strlen, &str);
2143 }
2144 
2145 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
2146 {
2147 	uint32_t bmlen, *p;
2148 
2149 	READ_BUF(4);
2150 	READ32(bmlen);
2151 
2152 	bitmap[0] = bitmap[1] = 0;
2153 	READ_BUF((bmlen << 2));
2154 	if (bmlen > 0) {
2155 		READ32(bitmap[0]);
2156 		if (bmlen > 1)
2157 			READ32(bitmap[1]);
2158 	}
2159 	return 0;
2160 }
2161 
2162 static inline int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, uint32_t **savep)
2163 {
2164 	uint32_t *p;
2165 
2166 	READ_BUF(4);
2167 	READ32(*attrlen);
2168 	*savep = xdr->p;
2169 	return 0;
2170 }
2171 
2172 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
2173 {
2174 	if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
2175 		decode_attr_bitmap(xdr, bitmask);
2176 		bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
2177 	} else
2178 		bitmask[0] = bitmask[1] = 0;
2179 	dprintk("%s: bitmask=0x%x%x\n", __FUNCTION__, bitmask[0], bitmask[1]);
2180 	return 0;
2181 }
2182 
2183 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
2184 {
2185 	uint32_t *p;
2186 
2187 	*type = 0;
2188 	if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
2189 		return -EIO;
2190 	if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
2191 		READ_BUF(4);
2192 		READ32(*type);
2193 		if (*type < NF4REG || *type > NF4NAMEDATTR) {
2194 			dprintk("%s: bad type %d\n", __FUNCTION__, *type);
2195 			return -EIO;
2196 		}
2197 		bitmap[0] &= ~FATTR4_WORD0_TYPE;
2198 	}
2199 	dprintk("%s: type=0%o\n", __FUNCTION__, nfs_type2fmt[*type].nfs2type);
2200 	return 0;
2201 }
2202 
2203 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
2204 {
2205 	uint32_t *p;
2206 
2207 	*change = 0;
2208 	if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
2209 		return -EIO;
2210 	if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
2211 		READ_BUF(8);
2212 		READ64(*change);
2213 		bitmap[0] &= ~FATTR4_WORD0_CHANGE;
2214 	}
2215 	dprintk("%s: change attribute=%Lu\n", __FUNCTION__,
2216 			(unsigned long long)*change);
2217 	return 0;
2218 }
2219 
2220 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
2221 {
2222 	uint32_t *p;
2223 
2224 	*size = 0;
2225 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
2226 		return -EIO;
2227 	if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
2228 		READ_BUF(8);
2229 		READ64(*size);
2230 		bitmap[0] &= ~FATTR4_WORD0_SIZE;
2231 	}
2232 	dprintk("%s: file size=%Lu\n", __FUNCTION__, (unsigned long long)*size);
2233 	return 0;
2234 }
2235 
2236 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2237 {
2238 	uint32_t *p;
2239 
2240 	*res = 0;
2241 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
2242 		return -EIO;
2243 	if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
2244 		READ_BUF(4);
2245 		READ32(*res);
2246 		bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
2247 	}
2248 	dprintk("%s: link support=%s\n", __FUNCTION__, *res == 0 ? "false" : "true");
2249 	return 0;
2250 }
2251 
2252 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2253 {
2254 	uint32_t *p;
2255 
2256 	*res = 0;
2257 	if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
2258 		return -EIO;
2259 	if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
2260 		READ_BUF(4);
2261 		READ32(*res);
2262 		bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
2263 	}
2264 	dprintk("%s: symlink support=%s\n", __FUNCTION__, *res == 0 ? "false" : "true");
2265 	return 0;
2266 }
2267 
2268 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
2269 {
2270 	uint32_t *p;
2271 
2272 	fsid->major = 0;
2273 	fsid->minor = 0;
2274 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
2275 		return -EIO;
2276 	if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
2277 		READ_BUF(16);
2278 		READ64(fsid->major);
2279 		READ64(fsid->minor);
2280 		bitmap[0] &= ~FATTR4_WORD0_FSID;
2281 	}
2282 	dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __FUNCTION__,
2283 			(unsigned long long)fsid->major,
2284 			(unsigned long long)fsid->minor);
2285 	return 0;
2286 }
2287 
2288 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2289 {
2290 	uint32_t *p;
2291 
2292 	*res = 60;
2293 	if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
2294 		return -EIO;
2295 	if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
2296 		READ_BUF(4);
2297 		READ32(*res);
2298 		bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
2299 	}
2300 	dprintk("%s: file size=%u\n", __FUNCTION__, (unsigned int)*res);
2301 	return 0;
2302 }
2303 
2304 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2305 {
2306 	uint32_t *p;
2307 
2308 	*res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
2309 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
2310 		return -EIO;
2311 	if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
2312 		READ_BUF(4);
2313 		READ32(*res);
2314 		bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
2315 	}
2316 	dprintk("%s: ACLs supported=%u\n", __FUNCTION__, (unsigned int)*res);
2317 	return 0;
2318 }
2319 
2320 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
2321 {
2322 	uint32_t *p;
2323 
2324 	*fileid = 0;
2325 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
2326 		return -EIO;
2327 	if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
2328 		READ_BUF(8);
2329 		READ64(*fileid);
2330 		bitmap[0] &= ~FATTR4_WORD0_FILEID;
2331 	}
2332 	dprintk("%s: fileid=%Lu\n", __FUNCTION__, (unsigned long long)*fileid);
2333 	return 0;
2334 }
2335 
2336 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
2337 {
2338 	uint32_t *p;
2339 
2340 	*fileid = 0;
2341 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
2342 		return -EIO;
2343 	if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
2344 		READ_BUF(8);
2345 		READ64(*fileid);
2346 		bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
2347 	}
2348 	dprintk("%s: fileid=%Lu\n", __FUNCTION__, (unsigned long long)*fileid);
2349 	return 0;
2350 }
2351 
2352 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2353 {
2354 	uint32_t *p;
2355 	int status = 0;
2356 
2357 	*res = 0;
2358 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
2359 		return -EIO;
2360 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
2361 		READ_BUF(8);
2362 		READ64(*res);
2363 		bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
2364 	}
2365 	dprintk("%s: files avail=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2366 	return status;
2367 }
2368 
2369 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2370 {
2371 	uint32_t *p;
2372 	int status = 0;
2373 
2374 	*res = 0;
2375 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
2376 		return -EIO;
2377 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
2378 		READ_BUF(8);
2379 		READ64(*res);
2380 		bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
2381 	}
2382 	dprintk("%s: files free=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2383 	return status;
2384 }
2385 
2386 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2387 {
2388 	uint32_t *p;
2389 	int status = 0;
2390 
2391 	*res = 0;
2392 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
2393 		return -EIO;
2394 	if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
2395 		READ_BUF(8);
2396 		READ64(*res);
2397 		bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
2398 	}
2399 	dprintk("%s: files total=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2400 	return status;
2401 }
2402 
2403 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
2404 {
2405 	int n;
2406 	uint32_t *p;
2407 	int status = 0;
2408 
2409 	READ_BUF(4);
2410 	READ32(n);
2411 	if (n < 0)
2412 		goto out_eio;
2413 	if (n == 0)
2414 		goto root_path;
2415 	dprintk("path ");
2416 	path->ncomponents = 0;
2417 	while (path->ncomponents < n) {
2418 		struct nfs4_string *component = &path->components[path->ncomponents];
2419 		status = decode_opaque_inline(xdr, &component->len, &component->data);
2420 		if (unlikely(status != 0))
2421 			goto out_eio;
2422 		if (path->ncomponents != n)
2423 			dprintk("/");
2424 		dprintk("%s", component->data);
2425 		if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
2426 			path->ncomponents++;
2427 		else {
2428 			dprintk("cannot parse %d components in path\n", n);
2429 			goto out_eio;
2430 		}
2431 	}
2432 out:
2433 	dprintk("\n");
2434 	return status;
2435 root_path:
2436 /* a root pathname is sent as a zero component4 */
2437 	path->ncomponents = 1;
2438 	path->components[0].len=0;
2439 	path->components[0].data=NULL;
2440 	dprintk("path /\n");
2441 	goto out;
2442 out_eio:
2443 	dprintk(" status %d", status);
2444 	status = -EIO;
2445 	goto out;
2446 }
2447 
2448 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
2449 {
2450 	int n;
2451 	uint32_t *p;
2452 	int status = -EIO;
2453 
2454 	if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
2455 		goto out;
2456 	status = 0;
2457 	if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
2458 		goto out;
2459 	dprintk("%s: fsroot ", __FUNCTION__);
2460 	status = decode_pathname(xdr, &res->fs_path);
2461 	if (unlikely(status != 0))
2462 		goto out;
2463 	READ_BUF(4);
2464 	READ32(n);
2465 	if (n <= 0)
2466 		goto out_eio;
2467 	res->nlocations = 0;
2468 	while (res->nlocations < n) {
2469 		int m;
2470 		struct nfs4_fs_location *loc = &res->locations[res->nlocations];
2471 
2472 		READ_BUF(4);
2473 		READ32(m);
2474 		if (m <= 0)
2475 			goto out_eio;
2476 
2477 		loc->nservers = 0;
2478 		dprintk("%s: servers ", __FUNCTION__);
2479 		while (loc->nservers < m) {
2480 			struct nfs4_string *server = &loc->servers[loc->nservers];
2481 			status = decode_opaque_inline(xdr, &server->len, &server->data);
2482 			if (unlikely(status != 0))
2483 				goto out_eio;
2484 			dprintk("%s ", server->data);
2485 			if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
2486 				loc->nservers++;
2487 			else {
2488 				int i;
2489 				dprintk("%s: using first %d of %d servers returned for location %d\n", __FUNCTION__, NFS4_FS_LOCATION_MAXSERVERS, m, res->nlocations);
2490 				for (i = loc->nservers; i < m; i++) {
2491 					int len;
2492 					char *data;
2493 					status = decode_opaque_inline(xdr, &len, &data);
2494 					if (unlikely(status != 0))
2495 						goto out_eio;
2496 				}
2497 			}
2498 		}
2499 		status = decode_pathname(xdr, &loc->rootpath);
2500 		if (unlikely(status != 0))
2501 			goto out_eio;
2502 		if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
2503 			res->nlocations++;
2504 	}
2505 out:
2506 	dprintk("%s: fs_locations done, error = %d\n", __FUNCTION__, status);
2507 	return status;
2508 out_eio:
2509 	status = -EIO;
2510 	goto out;
2511 }
2512 
2513 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2514 {
2515 	uint32_t *p;
2516 	int status = 0;
2517 
2518 	*res = 0;
2519 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
2520 		return -EIO;
2521 	if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
2522 		READ_BUF(8);
2523 		READ64(*res);
2524 		bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
2525 	}
2526 	dprintk("%s: maxfilesize=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2527 	return status;
2528 }
2529 
2530 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
2531 {
2532 	uint32_t *p;
2533 	int status = 0;
2534 
2535 	*maxlink = 1;
2536 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
2537 		return -EIO;
2538 	if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
2539 		READ_BUF(4);
2540 		READ32(*maxlink);
2541 		bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
2542 	}
2543 	dprintk("%s: maxlink=%u\n", __FUNCTION__, *maxlink);
2544 	return status;
2545 }
2546 
2547 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
2548 {
2549 	uint32_t *p;
2550 	int status = 0;
2551 
2552 	*maxname = 1024;
2553 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
2554 		return -EIO;
2555 	if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
2556 		READ_BUF(4);
2557 		READ32(*maxname);
2558 		bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
2559 	}
2560 	dprintk("%s: maxname=%u\n", __FUNCTION__, *maxname);
2561 	return status;
2562 }
2563 
2564 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2565 {
2566 	uint32_t *p;
2567 	int status = 0;
2568 
2569 	*res = 1024;
2570 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
2571 		return -EIO;
2572 	if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
2573 		uint64_t maxread;
2574 		READ_BUF(8);
2575 		READ64(maxread);
2576 		if (maxread > 0x7FFFFFFF)
2577 			maxread = 0x7FFFFFFF;
2578 		*res = (uint32_t)maxread;
2579 		bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
2580 	}
2581 	dprintk("%s: maxread=%lu\n", __FUNCTION__, (unsigned long)*res);
2582 	return status;
2583 }
2584 
2585 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
2586 {
2587 	uint32_t *p;
2588 	int status = 0;
2589 
2590 	*res = 1024;
2591 	if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
2592 		return -EIO;
2593 	if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
2594 		uint64_t maxwrite;
2595 		READ_BUF(8);
2596 		READ64(maxwrite);
2597 		if (maxwrite > 0x7FFFFFFF)
2598 			maxwrite = 0x7FFFFFFF;
2599 		*res = (uint32_t)maxwrite;
2600 		bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
2601 	}
2602 	dprintk("%s: maxwrite=%lu\n", __FUNCTION__, (unsigned long)*res);
2603 	return status;
2604 }
2605 
2606 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *mode)
2607 {
2608 	uint32_t *p;
2609 
2610 	*mode = 0;
2611 	if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
2612 		return -EIO;
2613 	if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
2614 		READ_BUF(4);
2615 		READ32(*mode);
2616 		*mode &= ~S_IFMT;
2617 		bitmap[1] &= ~FATTR4_WORD1_MODE;
2618 	}
2619 	dprintk("%s: file mode=0%o\n", __FUNCTION__, (unsigned int)*mode);
2620 	return 0;
2621 }
2622 
2623 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
2624 {
2625 	uint32_t *p;
2626 
2627 	*nlink = 1;
2628 	if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
2629 		return -EIO;
2630 	if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
2631 		READ_BUF(4);
2632 		READ32(*nlink);
2633 		bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
2634 	}
2635 	dprintk("%s: nlink=%u\n", __FUNCTION__, (unsigned int)*nlink);
2636 	return 0;
2637 }
2638 
2639 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_client *clp, int32_t *uid)
2640 {
2641 	uint32_t len, *p;
2642 
2643 	*uid = -2;
2644 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
2645 		return -EIO;
2646 	if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
2647 		READ_BUF(4);
2648 		READ32(len);
2649 		READ_BUF(len);
2650 		if (len < XDR_MAX_NETOBJ) {
2651 			if (nfs_map_name_to_uid(clp, (char *)p, len, uid) != 0)
2652 				dprintk("%s: nfs_map_name_to_uid failed!\n",
2653 						__FUNCTION__);
2654 		} else
2655 			printk(KERN_WARNING "%s: name too long (%u)!\n",
2656 					__FUNCTION__, len);
2657 		bitmap[1] &= ~FATTR4_WORD1_OWNER;
2658 	}
2659 	dprintk("%s: uid=%d\n", __FUNCTION__, (int)*uid);
2660 	return 0;
2661 }
2662 
2663 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_client *clp, int32_t *gid)
2664 {
2665 	uint32_t len, *p;
2666 
2667 	*gid = -2;
2668 	if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
2669 		return -EIO;
2670 	if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
2671 		READ_BUF(4);
2672 		READ32(len);
2673 		READ_BUF(len);
2674 		if (len < XDR_MAX_NETOBJ) {
2675 			if (nfs_map_group_to_gid(clp, (char *)p, len, gid) != 0)
2676 				dprintk("%s: nfs_map_group_to_gid failed!\n",
2677 						__FUNCTION__);
2678 		} else
2679 			printk(KERN_WARNING "%s: name too long (%u)!\n",
2680 					__FUNCTION__, len);
2681 		bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
2682 	}
2683 	dprintk("%s: gid=%d\n", __FUNCTION__, (int)*gid);
2684 	return 0;
2685 }
2686 
2687 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
2688 {
2689 	uint32_t major = 0, minor = 0, *p;
2690 
2691 	*rdev = MKDEV(0,0);
2692 	if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
2693 		return -EIO;
2694 	if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
2695 		dev_t tmp;
2696 
2697 		READ_BUF(8);
2698 		READ32(major);
2699 		READ32(minor);
2700 		tmp = MKDEV(major, minor);
2701 		if (MAJOR(tmp) == major && MINOR(tmp) == minor)
2702 			*rdev = tmp;
2703 		bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
2704 	}
2705 	dprintk("%s: rdev=(0x%x:0x%x)\n", __FUNCTION__, major, minor);
2706 	return 0;
2707 }
2708 
2709 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2710 {
2711 	uint32_t *p;
2712 	int status = 0;
2713 
2714 	*res = 0;
2715 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
2716 		return -EIO;
2717 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
2718 		READ_BUF(8);
2719 		READ64(*res);
2720 		bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
2721 	}
2722 	dprintk("%s: space avail=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2723 	return status;
2724 }
2725 
2726 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2727 {
2728 	uint32_t *p;
2729 	int status = 0;
2730 
2731 	*res = 0;
2732 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
2733 		return -EIO;
2734 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
2735 		READ_BUF(8);
2736 		READ64(*res);
2737 		bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
2738 	}
2739 	dprintk("%s: space free=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2740 	return status;
2741 }
2742 
2743 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
2744 {
2745 	uint32_t *p;
2746 	int status = 0;
2747 
2748 	*res = 0;
2749 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
2750 		return -EIO;
2751 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
2752 		READ_BUF(8);
2753 		READ64(*res);
2754 		bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
2755 	}
2756 	dprintk("%s: space total=%Lu\n", __FUNCTION__, (unsigned long long)*res);
2757 	return status;
2758 }
2759 
2760 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
2761 {
2762 	uint32_t *p;
2763 
2764 	*used = 0;
2765 	if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
2766 		return -EIO;
2767 	if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
2768 		READ_BUF(8);
2769 		READ64(*used);
2770 		bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
2771 	}
2772 	dprintk("%s: space used=%Lu\n", __FUNCTION__,
2773 			(unsigned long long)*used);
2774 	return 0;
2775 }
2776 
2777 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
2778 {
2779 	uint32_t *p;
2780 	uint64_t sec;
2781 	uint32_t nsec;
2782 
2783 	READ_BUF(12);
2784 	READ64(sec);
2785 	READ32(nsec);
2786 	time->tv_sec = (time_t)sec;
2787 	time->tv_nsec = (long)nsec;
2788 	return 0;
2789 }
2790 
2791 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
2792 {
2793 	int status = 0;
2794 
2795 	time->tv_sec = 0;
2796 	time->tv_nsec = 0;
2797 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
2798 		return -EIO;
2799 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
2800 		status = decode_attr_time(xdr, time);
2801 		bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
2802 	}
2803 	dprintk("%s: atime=%ld\n", __FUNCTION__, (long)time->tv_sec);
2804 	return status;
2805 }
2806 
2807 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
2808 {
2809 	int status = 0;
2810 
2811 	time->tv_sec = 0;
2812 	time->tv_nsec = 0;
2813 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
2814 		return -EIO;
2815 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
2816 		status = decode_attr_time(xdr, time);
2817 		bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
2818 	}
2819 	dprintk("%s: ctime=%ld\n", __FUNCTION__, (long)time->tv_sec);
2820 	return status;
2821 }
2822 
2823 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
2824 {
2825 	int status = 0;
2826 
2827 	time->tv_sec = 0;
2828 	time->tv_nsec = 0;
2829 	if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
2830 		return -EIO;
2831 	if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
2832 		status = decode_attr_time(xdr, time);
2833 		bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
2834 	}
2835 	dprintk("%s: mtime=%ld\n", __FUNCTION__, (long)time->tv_sec);
2836 	return status;
2837 }
2838 
2839 static int verify_attr_len(struct xdr_stream *xdr, uint32_t *savep, uint32_t attrlen)
2840 {
2841 	unsigned int attrwords = XDR_QUADLEN(attrlen);
2842 	unsigned int nwords = xdr->p - savep;
2843 
2844 	if (unlikely(attrwords != nwords)) {
2845 		printk(KERN_WARNING "%s: server returned incorrect attribute length: %u %c %u\n",
2846 				__FUNCTION__,
2847 				attrwords << 2,
2848 				(attrwords < nwords) ? '<' : '>',
2849 				nwords << 2);
2850 		return -EIO;
2851 	}
2852 	return 0;
2853 }
2854 
2855 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
2856 {
2857 	uint32_t *p;
2858 
2859 	READ_BUF(20);
2860 	READ32(cinfo->atomic);
2861 	READ64(cinfo->before);
2862 	READ64(cinfo->after);
2863 	return 0;
2864 }
2865 
2866 static int decode_access(struct xdr_stream *xdr, struct nfs4_accessres *access)
2867 {
2868 	uint32_t *p;
2869 	uint32_t supp, acc;
2870 	int status;
2871 
2872 	status = decode_op_hdr(xdr, OP_ACCESS);
2873 	if (status)
2874 		return status;
2875 	READ_BUF(8);
2876 	READ32(supp);
2877 	READ32(acc);
2878 	access->supported = supp;
2879 	access->access = acc;
2880 	return 0;
2881 }
2882 
2883 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
2884 {
2885 	uint32_t *p;
2886 	int status;
2887 
2888 	status = decode_op_hdr(xdr, OP_CLOSE);
2889 	if (status)
2890 		return status;
2891 	READ_BUF(sizeof(res->stateid.data));
2892 	COPYMEM(res->stateid.data, sizeof(res->stateid.data));
2893 	return 0;
2894 }
2895 
2896 static int decode_commit(struct xdr_stream *xdr, struct nfs_writeres *res)
2897 {
2898 	uint32_t *p;
2899 	int status;
2900 
2901 	status = decode_op_hdr(xdr, OP_COMMIT);
2902 	if (status)
2903 		return status;
2904 	READ_BUF(8);
2905 	COPYMEM(res->verf->verifier, 8);
2906 	return 0;
2907 }
2908 
2909 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
2910 {
2911 	uint32_t *p;
2912 	uint32_t bmlen;
2913 	int status;
2914 
2915 	status = decode_op_hdr(xdr, OP_CREATE);
2916 	if (status)
2917 		return status;
2918 	if ((status = decode_change_info(xdr, cinfo)))
2919 		return status;
2920 	READ_BUF(4);
2921 	READ32(bmlen);
2922 	READ_BUF(bmlen << 2);
2923 	return 0;
2924 }
2925 
2926 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
2927 {
2928 	uint32_t *savep;
2929 	uint32_t attrlen,
2930 		 bitmap[2] = {0};
2931 	int status;
2932 
2933 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
2934 		goto xdr_error;
2935 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
2936 		goto xdr_error;
2937 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
2938 		goto xdr_error;
2939 	if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
2940 		goto xdr_error;
2941 	if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
2942 		goto xdr_error;
2943 	if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
2944 		goto xdr_error;
2945 	if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
2946 		goto xdr_error;
2947 	status = verify_attr_len(xdr, savep, attrlen);
2948 xdr_error:
2949 	dprintk("%s: xdr returned %d!\n", __FUNCTION__, -status);
2950 	return status;
2951 }
2952 
2953 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
2954 {
2955 	uint32_t *savep;
2956 	uint32_t attrlen,
2957 		 bitmap[2] = {0};
2958 	int status;
2959 
2960 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
2961 		goto xdr_error;
2962 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
2963 		goto xdr_error;
2964 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
2965 		goto xdr_error;
2966 
2967 	if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
2968 		goto xdr_error;
2969 	if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
2970 		goto xdr_error;
2971 	if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
2972 		goto xdr_error;
2973 	if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
2974 		goto xdr_error;
2975 	if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
2976 		goto xdr_error;
2977 	if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
2978 		goto xdr_error;
2979 
2980 	status = verify_attr_len(xdr, savep, attrlen);
2981 xdr_error:
2982 	dprintk("%s: xdr returned %d!\n", __FUNCTION__, -status);
2983 	return status;
2984 }
2985 
2986 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
2987 {
2988 	uint32_t *savep;
2989 	uint32_t attrlen,
2990 		 bitmap[2] = {0};
2991 	int status;
2992 
2993 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
2994 		goto xdr_error;
2995 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
2996 		goto xdr_error;
2997 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
2998 		goto xdr_error;
2999 
3000 	if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
3001 		goto xdr_error;
3002 	if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
3003 		goto xdr_error;
3004 
3005 	status = verify_attr_len(xdr, savep, attrlen);
3006 xdr_error:
3007 	dprintk("%s: xdr returned %d!\n", __FUNCTION__, -status);
3008 	return status;
3009 }
3010 
3011 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, const struct nfs_server *server)
3012 {
3013 	uint32_t *savep;
3014 	uint32_t attrlen,
3015 		 bitmap[2] = {0},
3016 		 type;
3017 	int status, fmode = 0;
3018 	uint64_t fileid;
3019 
3020 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3021 		goto xdr_error;
3022 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3023 		goto xdr_error;
3024 
3025 	fattr->bitmap[0] = bitmap[0];
3026 	fattr->bitmap[1] = bitmap[1];
3027 
3028 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3029 		goto xdr_error;
3030 
3031 
3032 	if ((status = decode_attr_type(xdr, bitmap, &type)) != 0)
3033 		goto xdr_error;
3034 	fattr->type = nfs_type2fmt[type].nfs2type;
3035 	fmode = nfs_type2fmt[type].mode;
3036 
3037 	if ((status = decode_attr_change(xdr, bitmap, &fattr->change_attr)) != 0)
3038 		goto xdr_error;
3039 	if ((status = decode_attr_size(xdr, bitmap, &fattr->size)) != 0)
3040 		goto xdr_error;
3041 	if ((status = decode_attr_fsid(xdr, bitmap, &fattr->fsid)) != 0)
3042 		goto xdr_error;
3043 	if ((status = decode_attr_fileid(xdr, bitmap, &fattr->fileid)) != 0)
3044 		goto xdr_error;
3045 	if ((status = decode_attr_fs_locations(xdr, bitmap, container_of(fattr,
3046 						struct nfs4_fs_locations,
3047 						fattr))) != 0)
3048 		goto xdr_error;
3049 	if ((status = decode_attr_mode(xdr, bitmap, &fattr->mode)) != 0)
3050 		goto xdr_error;
3051 	fattr->mode |= fmode;
3052 	if ((status = decode_attr_nlink(xdr, bitmap, &fattr->nlink)) != 0)
3053 		goto xdr_error;
3054 	if ((status = decode_attr_owner(xdr, bitmap, server->nfs4_state, &fattr->uid)) != 0)
3055 		goto xdr_error;
3056 	if ((status = decode_attr_group(xdr, bitmap, server->nfs4_state, &fattr->gid)) != 0)
3057 		goto xdr_error;
3058 	if ((status = decode_attr_rdev(xdr, bitmap, &fattr->rdev)) != 0)
3059 		goto xdr_error;
3060 	if ((status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used)) != 0)
3061 		goto xdr_error;
3062 	if ((status = decode_attr_time_access(xdr, bitmap, &fattr->atime)) != 0)
3063 		goto xdr_error;
3064 	if ((status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime)) != 0)
3065 		goto xdr_error;
3066 	if ((status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime)) != 0)
3067 		goto xdr_error;
3068 	if ((status = decode_attr_mounted_on_fileid(xdr, bitmap, &fileid)) != 0)
3069 		goto xdr_error;
3070 	if (fattr->fileid == 0 && fileid != 0)
3071 		fattr->fileid = fileid;
3072 	if ((status = verify_attr_len(xdr, savep, attrlen)) == 0)
3073 		fattr->valid = NFS_ATTR_FATTR | NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4;
3074 xdr_error:
3075 	dprintk("%s: xdr returned %d\n", __FUNCTION__, -status);
3076 	return status;
3077 }
3078 
3079 
3080 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
3081 {
3082 	uint32_t *savep;
3083 	uint32_t attrlen, bitmap[2];
3084 	int status;
3085 
3086 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3087 		goto xdr_error;
3088 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3089 		goto xdr_error;
3090 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3091 		goto xdr_error;
3092 
3093 	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */
3094 
3095 	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
3096 		goto xdr_error;
3097 	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
3098 		goto xdr_error;
3099 	if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
3100 		goto xdr_error;
3101 	fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
3102 	if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
3103 		goto xdr_error;
3104 	fsinfo->wtpref = fsinfo->wtmax;
3105 
3106 	status = verify_attr_len(xdr, savep, attrlen);
3107 xdr_error:
3108 	dprintk("%s: xdr returned %d!\n", __FUNCTION__, -status);
3109 	return status;
3110 }
3111 
3112 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
3113 {
3114 	uint32_t *p;
3115 	uint32_t len;
3116 	int status;
3117 
3118 	status = decode_op_hdr(xdr, OP_GETFH);
3119 	if (status)
3120 		return status;
3121 	/* Zero handle first to allow comparisons */
3122 	memset(fh, 0, sizeof(*fh));
3123 
3124 	READ_BUF(4);
3125 	READ32(len);
3126 	if (len > NFS4_FHSIZE)
3127 		return -EIO;
3128 	fh->size = len;
3129 	READ_BUF(len);
3130 	COPYMEM(fh->data, len);
3131 	return 0;
3132 }
3133 
3134 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3135 {
3136 	int status;
3137 
3138 	status = decode_op_hdr(xdr, OP_LINK);
3139 	if (status)
3140 		return status;
3141 	return decode_change_info(xdr, cinfo);
3142 }
3143 
3144 /*
3145  * We create the owner, so we know a proper owner.id length is 4.
3146  */
3147 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
3148 {
3149 	uint64_t offset, length, clientid;
3150 	uint32_t *p;
3151 	uint32_t namelen, type;
3152 
3153 	READ_BUF(32);
3154 	READ64(offset);
3155 	READ64(length);
3156 	READ32(type);
3157 	if (fl != NULL) {
3158 		fl->fl_start = (loff_t)offset;
3159 		fl->fl_end = fl->fl_start + (loff_t)length - 1;
3160 		if (length == ~(uint64_t)0)
3161 			fl->fl_end = OFFSET_MAX;
3162 		fl->fl_type = F_WRLCK;
3163 		if (type & 1)
3164 			fl->fl_type = F_RDLCK;
3165 		fl->fl_pid = 0;
3166 	}
3167 	READ64(clientid);
3168 	READ32(namelen);
3169 	READ_BUF(namelen);
3170 	return -NFS4ERR_DENIED;
3171 }
3172 
3173 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
3174 {
3175 	uint32_t *p;
3176 	int status;
3177 
3178 	status = decode_op_hdr(xdr, OP_LOCK);
3179 	if (status == 0) {
3180 		READ_BUF(sizeof(res->stateid.data));
3181 		COPYMEM(res->stateid.data, sizeof(res->stateid.data));
3182 	} else if (status == -NFS4ERR_DENIED)
3183 		return decode_lock_denied(xdr, NULL);
3184 	return status;
3185 }
3186 
3187 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
3188 {
3189 	int status;
3190 	status = decode_op_hdr(xdr, OP_LOCKT);
3191 	if (status == -NFS4ERR_DENIED)
3192 		return decode_lock_denied(xdr, res->denied);
3193 	return status;
3194 }
3195 
3196 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
3197 {
3198 	uint32_t *p;
3199 	int status;
3200 
3201 	status = decode_op_hdr(xdr, OP_LOCKU);
3202 	if (status == 0) {
3203 		READ_BUF(sizeof(res->stateid.data));
3204 		COPYMEM(res->stateid.data, sizeof(res->stateid.data));
3205 	}
3206 	return status;
3207 }
3208 
3209 static int decode_lookup(struct xdr_stream *xdr)
3210 {
3211 	return decode_op_hdr(xdr, OP_LOOKUP);
3212 }
3213 
3214 /* This is too sick! */
3215 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
3216 {
3217         uint32_t *p;
3218 	uint32_t limit_type, nblocks, blocksize;
3219 
3220 	READ_BUF(12);
3221 	READ32(limit_type);
3222 	switch (limit_type) {
3223 		case 1:
3224 			READ64(*maxsize);
3225 			break;
3226 		case 2:
3227 			READ32(nblocks);
3228 			READ32(blocksize);
3229 			*maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
3230 	}
3231 	return 0;
3232 }
3233 
3234 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
3235 {
3236         uint32_t *p;
3237         uint32_t delegation_type;
3238 
3239 	READ_BUF(4);
3240 	READ32(delegation_type);
3241 	if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
3242 		res->delegation_type = 0;
3243 		return 0;
3244 	}
3245 	READ_BUF(20);
3246 	COPYMEM(res->delegation.data, sizeof(res->delegation.data));
3247 	READ32(res->do_recall);
3248 	switch (delegation_type) {
3249 		case NFS4_OPEN_DELEGATE_READ:
3250 			res->delegation_type = FMODE_READ;
3251 			break;
3252 		case NFS4_OPEN_DELEGATE_WRITE:
3253 			res->delegation_type = FMODE_WRITE|FMODE_READ;
3254 			if (decode_space_limit(xdr, &res->maxsize) < 0)
3255 				return -EIO;
3256 	}
3257 	return decode_ace(xdr, NULL, res->server->nfs4_state);
3258 }
3259 
3260 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
3261 {
3262         uint32_t *p;
3263         uint32_t bmlen;
3264         int status;
3265 
3266         status = decode_op_hdr(xdr, OP_OPEN);
3267         if (status)
3268                 return status;
3269         READ_BUF(sizeof(res->stateid.data));
3270         COPYMEM(res->stateid.data, sizeof(res->stateid.data));
3271 
3272         decode_change_info(xdr, &res->cinfo);
3273 
3274         READ_BUF(8);
3275         READ32(res->rflags);
3276         READ32(bmlen);
3277         if (bmlen > 10)
3278                 goto xdr_error;
3279 
3280         READ_BUF(bmlen << 2);
3281         p += bmlen;
3282 	return decode_delegation(xdr, res);
3283 xdr_error:
3284 	dprintk("%s: Bitmap too large! Length = %u\n", __FUNCTION__, bmlen);
3285 	return -EIO;
3286 }
3287 
3288 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
3289 {
3290         uint32_t *p;
3291 	int status;
3292 
3293         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
3294         if (status)
3295                 return status;
3296         READ_BUF(sizeof(res->stateid.data));
3297         COPYMEM(res->stateid.data, sizeof(res->stateid.data));
3298         return 0;
3299 }
3300 
3301 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
3302 {
3303 	uint32_t *p;
3304 	int status;
3305 
3306 	status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
3307 	if (status)
3308 		return status;
3309 	READ_BUF(sizeof(res->stateid.data));
3310 	COPYMEM(res->stateid.data, sizeof(res->stateid.data));
3311 	return 0;
3312 }
3313 
3314 static int decode_putfh(struct xdr_stream *xdr)
3315 {
3316 	return decode_op_hdr(xdr, OP_PUTFH);
3317 }
3318 
3319 static int decode_putrootfh(struct xdr_stream *xdr)
3320 {
3321 	return decode_op_hdr(xdr, OP_PUTROOTFH);
3322 }
3323 
3324 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
3325 {
3326 	struct kvec *iov = req->rq_rcv_buf.head;
3327 	uint32_t *p;
3328 	uint32_t count, eof, recvd, hdrlen;
3329 	int status;
3330 
3331 	status = decode_op_hdr(xdr, OP_READ);
3332 	if (status)
3333 		return status;
3334 	READ_BUF(8);
3335 	READ32(eof);
3336 	READ32(count);
3337 	hdrlen = (u8 *) p - (u8 *) iov->iov_base;
3338 	recvd = req->rq_rcv_buf.len - hdrlen;
3339 	if (count > recvd) {
3340 		printk(KERN_WARNING "NFS: server cheating in read reply: "
3341 				"count %u > recvd %u\n", count, recvd);
3342 		count = recvd;
3343 		eof = 0;
3344 	}
3345 	xdr_read_pages(xdr, count);
3346 	res->eof = eof;
3347 	res->count = count;
3348 	return 0;
3349 }
3350 
3351 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
3352 {
3353 	struct xdr_buf	*rcvbuf = &req->rq_rcv_buf;
3354 	struct page	*page = *rcvbuf->pages;
3355 	struct kvec	*iov = rcvbuf->head;
3356 	unsigned int	nr, pglen = rcvbuf->page_len;
3357 	uint32_t	*end, *entry, *p, *kaddr;
3358 	uint32_t	len, attrlen, xlen;
3359 	int 		hdrlen, recvd, status;
3360 
3361 	status = decode_op_hdr(xdr, OP_READDIR);
3362 	if (status)
3363 		return status;
3364 	READ_BUF(8);
3365 	COPYMEM(readdir->verifier.data, 8);
3366 	dprintk("%s: verifier = 0x%x%x\n",
3367 			__FUNCTION__,
3368 			((u32 *)readdir->verifier.data)[0],
3369 			((u32 *)readdir->verifier.data)[1]);
3370 
3371 
3372 	hdrlen = (char *) p - (char *) iov->iov_base;
3373 	recvd = rcvbuf->len - hdrlen;
3374 	if (pglen > recvd)
3375 		pglen = recvd;
3376 	xdr_read_pages(xdr, pglen);
3377 
3378 	BUG_ON(pglen + readdir->pgbase > PAGE_CACHE_SIZE);
3379 	kaddr = p = (uint32_t *) kmap_atomic(page, KM_USER0);
3380 	end = p + ((pglen + readdir->pgbase) >> 2);
3381 	entry = p;
3382 	for (nr = 0; *p++; nr++) {
3383 		if (end - p < 3)
3384 			goto short_pkt;
3385 		dprintk("cookie = %Lu, ", *((unsigned long long *)p));
3386 		p += 2;			/* cookie */
3387 		len = ntohl(*p++);	/* filename length */
3388 		if (len > NFS4_MAXNAMLEN) {
3389 			printk(KERN_WARNING "NFS: giant filename in readdir (len 0x%x)\n", len);
3390 			goto err_unmap;
3391 		}
3392 		xlen = XDR_QUADLEN(len);
3393 		if (end - p < xlen + 1)
3394 			goto short_pkt;
3395 		dprintk("filename = %*s\n", len, (char *)p);
3396 		p += xlen;
3397 		len = ntohl(*p++);	/* bitmap length */
3398 		if (end - p < len + 1)
3399 			goto short_pkt;
3400 		p += len;
3401 		attrlen = XDR_QUADLEN(ntohl(*p++));
3402 		if (end - p < attrlen + 2)
3403 			goto short_pkt;
3404 		p += attrlen;		/* attributes */
3405 		entry = p;
3406 	}
3407 	if (!nr && (entry[0] != 0 || entry[1] == 0))
3408 		goto short_pkt;
3409 out:
3410 	kunmap_atomic(kaddr, KM_USER0);
3411 	return 0;
3412 short_pkt:
3413 	dprintk("%s: short packet at entry %d\n", __FUNCTION__, nr);
3414 	entry[0] = entry[1] = 0;
3415 	/* truncate listing ? */
3416 	if (!nr) {
3417 		printk(KERN_NOTICE "NFS: readdir reply truncated!\n");
3418 		entry[1] = 1;
3419 	}
3420 	goto out;
3421 err_unmap:
3422 	kunmap_atomic(kaddr, KM_USER0);
3423 	return -errno_NFSERR_IO;
3424 }
3425 
3426 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
3427 {
3428 	struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
3429 	struct kvec *iov = rcvbuf->head;
3430 	int hdrlen, len, recvd;
3431 	uint32_t *p;
3432 	char *kaddr;
3433 	int status;
3434 
3435 	status = decode_op_hdr(xdr, OP_READLINK);
3436 	if (status)
3437 		return status;
3438 
3439 	/* Convert length of symlink */
3440 	READ_BUF(4);
3441 	READ32(len);
3442 	if (len >= rcvbuf->page_len || len <= 0) {
3443 		dprintk(KERN_WARNING "nfs: server returned giant symlink!\n");
3444 		return -ENAMETOOLONG;
3445 	}
3446 	hdrlen = (char *) xdr->p - (char *) iov->iov_base;
3447 	recvd = req->rq_rcv_buf.len - hdrlen;
3448 	if (recvd < len) {
3449 		printk(KERN_WARNING "NFS: server cheating in readlink reply: "
3450 				"count %u > recvd %u\n", len, recvd);
3451 		return -EIO;
3452 	}
3453 	xdr_read_pages(xdr, len);
3454 	/*
3455 	 * The XDR encode routine has set things up so that
3456 	 * the link text will be copied directly into the
3457 	 * buffer.  We just have to do overflow-checking,
3458 	 * and and null-terminate the text (the VFS expects
3459 	 * null-termination).
3460 	 */
3461 	kaddr = (char *)kmap_atomic(rcvbuf->pages[0], KM_USER0);
3462 	kaddr[len+rcvbuf->page_base] = '\0';
3463 	kunmap_atomic(kaddr, KM_USER0);
3464 	return 0;
3465 }
3466 
3467 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
3468 {
3469 	int status;
3470 
3471 	status = decode_op_hdr(xdr, OP_REMOVE);
3472 	if (status)
3473 		goto out;
3474 	status = decode_change_info(xdr, cinfo);
3475 out:
3476 	return status;
3477 }
3478 
3479 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
3480 	      struct nfs4_change_info *new_cinfo)
3481 {
3482 	int status;
3483 
3484 	status = decode_op_hdr(xdr, OP_RENAME);
3485 	if (status)
3486 		goto out;
3487 	if ((status = decode_change_info(xdr, old_cinfo)))
3488 		goto out;
3489 	status = decode_change_info(xdr, new_cinfo);
3490 out:
3491 	return status;
3492 }
3493 
3494 static int decode_renew(struct xdr_stream *xdr)
3495 {
3496 	return decode_op_hdr(xdr, OP_RENEW);
3497 }
3498 
3499 static int
3500 decode_restorefh(struct xdr_stream *xdr)
3501 {
3502 	return decode_op_hdr(xdr, OP_RESTOREFH);
3503 }
3504 
3505 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
3506 		size_t *acl_len)
3507 {
3508 	uint32_t *savep;
3509 	uint32_t attrlen,
3510 		 bitmap[2] = {0};
3511 	struct kvec *iov = req->rq_rcv_buf.head;
3512 	int status;
3513 
3514 	*acl_len = 0;
3515 	if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
3516 		goto out;
3517 	if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
3518 		goto out;
3519 	if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
3520 		goto out;
3521 
3522 	if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
3523 		return -EIO;
3524 	if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
3525 		int hdrlen, recvd;
3526 
3527 		/* We ignore &savep and don't do consistency checks on
3528 		 * the attr length.  Let userspace figure it out.... */
3529 		hdrlen = (u8 *)xdr->p - (u8 *)iov->iov_base;
3530 		recvd = req->rq_rcv_buf.len - hdrlen;
3531 		if (attrlen > recvd) {
3532 			printk(KERN_WARNING "NFS: server cheating in getattr"
3533 					" acl reply: attrlen %u > recvd %u\n",
3534 					attrlen, recvd);
3535 			return -EINVAL;
3536 		}
3537 		xdr_read_pages(xdr, attrlen);
3538 		*acl_len = attrlen;
3539 	} else
3540 		status = -EOPNOTSUPP;
3541 
3542 out:
3543 	return status;
3544 }
3545 
3546 static int
3547 decode_savefh(struct xdr_stream *xdr)
3548 {
3549 	return decode_op_hdr(xdr, OP_SAVEFH);
3550 }
3551 
3552 static int decode_setattr(struct xdr_stream *xdr, struct nfs_setattrres *res)
3553 {
3554 	uint32_t *p;
3555 	uint32_t bmlen;
3556 	int status;
3557 
3558 
3559 	status = decode_op_hdr(xdr, OP_SETATTR);
3560 	if (status)
3561 		return status;
3562 	READ_BUF(4);
3563 	READ32(bmlen);
3564 	READ_BUF(bmlen << 2);
3565 	return 0;
3566 }
3567 
3568 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_client *clp)
3569 {
3570 	uint32_t *p;
3571 	uint32_t opnum;
3572 	int32_t nfserr;
3573 
3574 	READ_BUF(8);
3575 	READ32(opnum);
3576 	if (opnum != OP_SETCLIENTID) {
3577 		printk(KERN_NOTICE
3578 				"nfs4_decode_setclientid: Server returned operation"
3579 			       	" %d\n", opnum);
3580 		return -EIO;
3581 	}
3582 	READ32(nfserr);
3583 	if (nfserr == NFS_OK) {
3584 		READ_BUF(8 + sizeof(clp->cl_confirm.data));
3585 		READ64(clp->cl_clientid);
3586 		COPYMEM(clp->cl_confirm.data, sizeof(clp->cl_confirm.data));
3587 	} else if (nfserr == NFSERR_CLID_INUSE) {
3588 		uint32_t len;
3589 
3590 		/* skip netid string */
3591 		READ_BUF(4);
3592 		READ32(len);
3593 		READ_BUF(len);
3594 
3595 		/* skip uaddr string */
3596 		READ_BUF(4);
3597 		READ32(len);
3598 		READ_BUF(len);
3599 		return -NFSERR_CLID_INUSE;
3600 	} else
3601 		return -nfs_stat_to_errno(nfserr);
3602 
3603 	return 0;
3604 }
3605 
3606 static int decode_setclientid_confirm(struct xdr_stream *xdr)
3607 {
3608 	return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
3609 }
3610 
3611 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
3612 {
3613 	uint32_t *p;
3614 	int status;
3615 
3616 	status = decode_op_hdr(xdr, OP_WRITE);
3617 	if (status)
3618 		return status;
3619 
3620 	READ_BUF(16);
3621 	READ32(res->count);
3622 	READ32(res->verf->committed);
3623 	COPYMEM(res->verf->verifier, 8);
3624 	return 0;
3625 }
3626 
3627 static int decode_delegreturn(struct xdr_stream *xdr)
3628 {
3629 	return decode_op_hdr(xdr, OP_DELEGRETURN);
3630 }
3631 
3632 /*
3633  * Decode OPEN_DOWNGRADE response
3634  */
3635 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_closeres *res)
3636 {
3637         struct xdr_stream xdr;
3638         struct compound_hdr hdr;
3639         int status;
3640 
3641         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3642         status = decode_compound_hdr(&xdr, &hdr);
3643         if (status)
3644                 goto out;
3645         status = decode_putfh(&xdr);
3646         if (status)
3647                 goto out;
3648         status = decode_open_downgrade(&xdr, res);
3649 	if (status != 0)
3650 		goto out;
3651 	decode_getfattr(&xdr, res->fattr, res->server);
3652 out:
3653         return status;
3654 }
3655 
3656 /*
3657  * END OF "GENERIC" DECODE ROUTINES.
3658  */
3659 
3660 /*
3661  * Decode ACCESS response
3662  */
3663 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_accessres *res)
3664 {
3665 	struct xdr_stream xdr;
3666 	struct compound_hdr hdr;
3667 	int status;
3668 
3669 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3670 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3671 		goto out;
3672 	if ((status = decode_putfh(&xdr)) == 0)
3673 		status = decode_access(&xdr, res);
3674 out:
3675 	return status;
3676 }
3677 
3678 /*
3679  * Decode LOOKUP response
3680  */
3681 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_lookup_res *res)
3682 {
3683 	struct xdr_stream xdr;
3684 	struct compound_hdr hdr;
3685 	int status;
3686 
3687 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3688 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3689 		goto out;
3690 	if ((status = decode_putfh(&xdr)) != 0)
3691 		goto out;
3692 	if ((status = decode_lookup(&xdr)) != 0)
3693 		goto out;
3694 	if ((status = decode_getfh(&xdr, res->fh)) != 0)
3695 		goto out;
3696 	status = decode_getfattr(&xdr, res->fattr, res->server);
3697 out:
3698 	return status;
3699 }
3700 
3701 /*
3702  * Decode LOOKUP_ROOT response
3703  */
3704 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_lookup_res *res)
3705 {
3706 	struct xdr_stream xdr;
3707 	struct compound_hdr hdr;
3708 	int status;
3709 
3710 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3711 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3712 		goto out;
3713 	if ((status = decode_putrootfh(&xdr)) != 0)
3714 		goto out;
3715 	if ((status = decode_getfh(&xdr, res->fh)) == 0)
3716 		status = decode_getfattr(&xdr, res->fattr, res->server);
3717 out:
3718 	return status;
3719 }
3720 
3721 /*
3722  * Decode REMOVE response
3723  */
3724 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_remove_res *res)
3725 {
3726 	struct xdr_stream xdr;
3727 	struct compound_hdr hdr;
3728 	int status;
3729 
3730 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3731 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3732 		goto out;
3733 	if ((status = decode_putfh(&xdr)) != 0)
3734 		goto out;
3735 	if ((status = decode_remove(&xdr, &res->cinfo)) != 0)
3736 		goto out;
3737 	decode_getfattr(&xdr, res->dir_attr, res->server);
3738 out:
3739 	return status;
3740 }
3741 
3742 /*
3743  * Decode RENAME response
3744  */
3745 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_rename_res *res)
3746 {
3747 	struct xdr_stream xdr;
3748 	struct compound_hdr hdr;
3749 	int status;
3750 
3751 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3752 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3753 		goto out;
3754 	if ((status = decode_putfh(&xdr)) != 0)
3755 		goto out;
3756 	if ((status = decode_savefh(&xdr)) != 0)
3757 		goto out;
3758 	if ((status = decode_putfh(&xdr)) != 0)
3759 		goto out;
3760 	if ((status = decode_rename(&xdr, &res->old_cinfo, &res->new_cinfo)) != 0)
3761 		goto out;
3762 	/* Current FH is target directory */
3763 	if (decode_getfattr(&xdr, res->new_fattr, res->server) != 0)
3764 		goto out;
3765 	if ((status = decode_restorefh(&xdr)) != 0)
3766 		goto out;
3767 	decode_getfattr(&xdr, res->old_fattr, res->server);
3768 out:
3769 	return status;
3770 }
3771 
3772 /*
3773  * Decode LINK response
3774  */
3775 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_link_res *res)
3776 {
3777 	struct xdr_stream xdr;
3778 	struct compound_hdr hdr;
3779 	int status;
3780 
3781 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3782 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3783 		goto out;
3784 	if ((status = decode_putfh(&xdr)) != 0)
3785 		goto out;
3786 	if ((status = decode_savefh(&xdr)) != 0)
3787 		goto out;
3788 	if ((status = decode_putfh(&xdr)) != 0)
3789 		goto out;
3790 	if ((status = decode_link(&xdr, &res->cinfo)) != 0)
3791 		goto out;
3792 	/*
3793 	 * Note order: OP_LINK leaves the directory as the current
3794 	 *             filehandle.
3795 	 */
3796 	if (decode_getfattr(&xdr, res->dir_attr, res->server) != 0)
3797 		goto out;
3798 	if ((status = decode_restorefh(&xdr)) != 0)
3799 		goto out;
3800 	decode_getfattr(&xdr, res->fattr, res->server);
3801 out:
3802 	return status;
3803 }
3804 
3805 /*
3806  * Decode CREATE response
3807  */
3808 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_create_res *res)
3809 {
3810 	struct xdr_stream xdr;
3811 	struct compound_hdr hdr;
3812 	int status;
3813 
3814 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3815 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
3816 		goto out;
3817 	if ((status = decode_putfh(&xdr)) != 0)
3818 		goto out;
3819 	if ((status = decode_savefh(&xdr)) != 0)
3820 		goto out;
3821 	if ((status = decode_create(&xdr,&res->dir_cinfo)) != 0)
3822 		goto out;
3823 	if ((status = decode_getfh(&xdr, res->fh)) != 0)
3824 		goto out;
3825 	if (decode_getfattr(&xdr, res->fattr, res->server) != 0)
3826 		goto out;
3827 	if ((status = decode_restorefh(&xdr)) != 0)
3828 		goto out;
3829 	decode_getfattr(&xdr, res->dir_fattr, res->server);
3830 out:
3831 	return status;
3832 }
3833 
3834 /*
3835  * Decode SYMLINK response
3836  */
3837 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_create_res *res)
3838 {
3839 	return nfs4_xdr_dec_create(rqstp, p, res);
3840 }
3841 
3842 /*
3843  * Decode GETATTR response
3844  */
3845 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_getattr_res *res)
3846 {
3847 	struct xdr_stream xdr;
3848 	struct compound_hdr hdr;
3849 	int status;
3850 
3851 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3852 	status = decode_compound_hdr(&xdr, &hdr);
3853 	if (status)
3854 		goto out;
3855 	status = decode_putfh(&xdr);
3856 	if (status)
3857 		goto out;
3858 	status = decode_getfattr(&xdr, res->fattr, res->server);
3859 out:
3860 	return status;
3861 
3862 }
3863 
3864 /*
3865  * Encode an SETACL request
3866  */
3867 static int
3868 nfs4_xdr_enc_setacl(struct rpc_rqst *req, uint32_t *p, struct nfs_setaclargs *args)
3869 {
3870         struct xdr_stream xdr;
3871         struct compound_hdr hdr = {
3872                 .nops   = 2,
3873         };
3874         int status;
3875 
3876         xdr_init_encode(&xdr, &req->rq_snd_buf, p);
3877         encode_compound_hdr(&xdr, &hdr);
3878         status = encode_putfh(&xdr, args->fh);
3879         if (status)
3880                 goto out;
3881         status = encode_setacl(&xdr, args);
3882 out:
3883         return status;
3884 }
3885 /*
3886  * Decode SETACL response
3887  */
3888 static int
3889 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, uint32_t *p, void *res)
3890 {
3891 	struct xdr_stream xdr;
3892 	struct compound_hdr hdr;
3893 	int status;
3894 
3895 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3896 	status = decode_compound_hdr(&xdr, &hdr);
3897 	if (status)
3898 		goto out;
3899 	status = decode_putfh(&xdr);
3900 	if (status)
3901 		goto out;
3902 	status = decode_setattr(&xdr, res);
3903 out:
3904 	return status;
3905 }
3906 
3907 /*
3908  * Decode GETACL response
3909  */
3910 static int
3911 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, uint32_t *p, size_t *acl_len)
3912 {
3913 	struct xdr_stream xdr;
3914 	struct compound_hdr hdr;
3915 	int status;
3916 
3917 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3918 	status = decode_compound_hdr(&xdr, &hdr);
3919 	if (status)
3920 		goto out;
3921 	status = decode_putfh(&xdr);
3922 	if (status)
3923 		goto out;
3924 	status = decode_getacl(&xdr, rqstp, acl_len);
3925 
3926 out:
3927 	return status;
3928 }
3929 
3930 /*
3931  * Decode CLOSE response
3932  */
3933 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_closeres *res)
3934 {
3935         struct xdr_stream xdr;
3936         struct compound_hdr hdr;
3937         int status;
3938 
3939         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3940         status = decode_compound_hdr(&xdr, &hdr);
3941         if (status)
3942                 goto out;
3943         status = decode_putfh(&xdr);
3944         if (status)
3945                 goto out;
3946         status = decode_close(&xdr, res);
3947 	if (status != 0)
3948 		goto out;
3949 	/*
3950 	 * Note: Server may do delete on close for this file
3951 	 * 	in which case the getattr call will fail with
3952 	 * 	an ESTALE error. Shouldn't be a problem,
3953 	 * 	though, since fattr->valid will remain unset.
3954 	 */
3955 	decode_getfattr(&xdr, res->fattr, res->server);
3956 out:
3957         return status;
3958 }
3959 
3960 /*
3961  * Decode OPEN response
3962  */
3963 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_openres *res)
3964 {
3965         struct xdr_stream xdr;
3966         struct compound_hdr hdr;
3967         int status;
3968 
3969         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
3970         status = decode_compound_hdr(&xdr, &hdr);
3971         if (status)
3972                 goto out;
3973         status = decode_putfh(&xdr);
3974         if (status)
3975                 goto out;
3976         status = decode_savefh(&xdr);
3977 	if (status)
3978 		goto out;
3979         status = decode_open(&xdr, res);
3980         if (status)
3981                 goto out;
3982 	status = decode_getfh(&xdr, &res->fh);
3983         if (status)
3984 		goto out;
3985 	if (decode_getfattr(&xdr, res->f_attr, res->server) != 0)
3986 		goto out;
3987 	if ((status = decode_restorefh(&xdr)) != 0)
3988 		goto out;
3989 	decode_getfattr(&xdr, res->dir_attr, res->server);
3990 out:
3991         return status;
3992 }
3993 
3994 /*
3995  * Decode OPEN_CONFIRM response
3996  */
3997 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_open_confirmres *res)
3998 {
3999         struct xdr_stream xdr;
4000         struct compound_hdr hdr;
4001         int status;
4002 
4003         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4004         status = decode_compound_hdr(&xdr, &hdr);
4005         if (status)
4006                 goto out;
4007         status = decode_putfh(&xdr);
4008         if (status)
4009                 goto out;
4010         status = decode_open_confirm(&xdr, res);
4011 out:
4012         return status;
4013 }
4014 
4015 /*
4016  * Decode OPEN response
4017  */
4018 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_openres *res)
4019 {
4020         struct xdr_stream xdr;
4021         struct compound_hdr hdr;
4022         int status;
4023 
4024         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4025         status = decode_compound_hdr(&xdr, &hdr);
4026         if (status)
4027                 goto out;
4028         status = decode_putfh(&xdr);
4029         if (status)
4030                 goto out;
4031         status = decode_open(&xdr, res);
4032         if (status)
4033                 goto out;
4034 	decode_getfattr(&xdr, res->f_attr, res->server);
4035 out:
4036         return status;
4037 }
4038 
4039 /*
4040  * Decode SETATTR response
4041  */
4042 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_setattrres *res)
4043 {
4044         struct xdr_stream xdr;
4045         struct compound_hdr hdr;
4046         int status;
4047 
4048         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4049         status = decode_compound_hdr(&xdr, &hdr);
4050         if (status)
4051                 goto out;
4052         status = decode_putfh(&xdr);
4053         if (status)
4054                 goto out;
4055         status = decode_setattr(&xdr, res);
4056         if (status)
4057                 goto out;
4058 	status = decode_getfattr(&xdr, res->fattr, res->server);
4059 	if (status == NFS4ERR_DELAY)
4060 		status = 0;
4061 out:
4062         return status;
4063 }
4064 
4065 /*
4066  * Decode LOCK response
4067  */
4068 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_lock_res *res)
4069 {
4070 	struct xdr_stream xdr;
4071 	struct compound_hdr hdr;
4072 	int status;
4073 
4074 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4075 	status = decode_compound_hdr(&xdr, &hdr);
4076 	if (status)
4077 		goto out;
4078 	status = decode_putfh(&xdr);
4079 	if (status)
4080 		goto out;
4081 	status = decode_lock(&xdr, res);
4082 out:
4083 	return status;
4084 }
4085 
4086 /*
4087  * Decode LOCKT response
4088  */
4089 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_lockt_res *res)
4090 {
4091 	struct xdr_stream xdr;
4092 	struct compound_hdr hdr;
4093 	int status;
4094 
4095 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4096 	status = decode_compound_hdr(&xdr, &hdr);
4097 	if (status)
4098 		goto out;
4099 	status = decode_putfh(&xdr);
4100 	if (status)
4101 		goto out;
4102 	status = decode_lockt(&xdr, res);
4103 out:
4104 	return status;
4105 }
4106 
4107 /*
4108  * Decode LOCKU response
4109  */
4110 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_locku_res *res)
4111 {
4112 	struct xdr_stream xdr;
4113 	struct compound_hdr hdr;
4114 	int status;
4115 
4116 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4117 	status = decode_compound_hdr(&xdr, &hdr);
4118 	if (status)
4119 		goto out;
4120 	status = decode_putfh(&xdr);
4121 	if (status)
4122 		goto out;
4123 	status = decode_locku(&xdr, res);
4124 out:
4125 	return status;
4126 }
4127 
4128 /*
4129  * Decode READLINK response
4130  */
4131 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp, uint32_t *p, void *res)
4132 {
4133 	struct xdr_stream xdr;
4134 	struct compound_hdr hdr;
4135 	int status;
4136 
4137 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4138 	status = decode_compound_hdr(&xdr, &hdr);
4139 	if (status)
4140 		goto out;
4141 	status = decode_putfh(&xdr);
4142 	if (status)
4143 		goto out;
4144 	status = decode_readlink(&xdr, rqstp);
4145 out:
4146 	return status;
4147 }
4148 
4149 /*
4150  * Decode READDIR response
4151  */
4152 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_readdir_res *res)
4153 {
4154 	struct xdr_stream xdr;
4155 	struct compound_hdr hdr;
4156 	int status;
4157 
4158 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4159 	status = decode_compound_hdr(&xdr, &hdr);
4160 	if (status)
4161 		goto out;
4162 	status = decode_putfh(&xdr);
4163 	if (status)
4164 		goto out;
4165 	status = decode_readdir(&xdr, rqstp, res);
4166 out:
4167 	return status;
4168 }
4169 
4170 /*
4171  * Decode Read response
4172  */
4173 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_readres *res)
4174 {
4175 	struct xdr_stream xdr;
4176 	struct compound_hdr hdr;
4177 	int status;
4178 
4179 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4180 	status = decode_compound_hdr(&xdr, &hdr);
4181 	if (status)
4182 		goto out;
4183 	status = decode_putfh(&xdr);
4184 	if (status)
4185 		goto out;
4186 	status = decode_read(&xdr, rqstp, res);
4187 	if (!status)
4188 		status = res->count;
4189 out:
4190 	return status;
4191 }
4192 
4193 /*
4194  * Decode WRITE response
4195  */
4196 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_writeres *res)
4197 {
4198 	struct xdr_stream xdr;
4199 	struct compound_hdr hdr;
4200 	int status;
4201 
4202 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4203 	status = decode_compound_hdr(&xdr, &hdr);
4204 	if (status)
4205 		goto out;
4206 	status = decode_putfh(&xdr);
4207 	if (status)
4208 		goto out;
4209 	status = decode_write(&xdr, res);
4210 	if (status)
4211 		goto out;
4212 	decode_getfattr(&xdr, res->fattr, res->server);
4213 	if (!status)
4214 		status = res->count;
4215 out:
4216 	return status;
4217 }
4218 
4219 /*
4220  * Decode COMMIT response
4221  */
4222 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, uint32_t *p, struct nfs_writeres *res)
4223 {
4224 	struct xdr_stream xdr;
4225 	struct compound_hdr hdr;
4226 	int status;
4227 
4228 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4229 	status = decode_compound_hdr(&xdr, &hdr);
4230 	if (status)
4231 		goto out;
4232 	status = decode_putfh(&xdr);
4233 	if (status)
4234 		goto out;
4235 	status = decode_commit(&xdr, res);
4236 	if (status)
4237 		goto out;
4238 	decode_getfattr(&xdr, res->fattr, res->server);
4239 out:
4240 	return status;
4241 }
4242 
4243 /*
4244  * FSINFO request
4245  */
4246 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, uint32_t *p, struct nfs_fsinfo *fsinfo)
4247 {
4248 	struct xdr_stream xdr;
4249 	struct compound_hdr hdr;
4250 	int status;
4251 
4252 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4253 	status = decode_compound_hdr(&xdr, &hdr);
4254 	if (!status)
4255 		status = decode_putfh(&xdr);
4256 	if (!status)
4257 		status = decode_fsinfo(&xdr, fsinfo);
4258 	if (!status)
4259 		status = -nfs_stat_to_errno(hdr.status);
4260 	return status;
4261 }
4262 
4263 /*
4264  * PATHCONF request
4265  */
4266 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, uint32_t *p, struct nfs_pathconf *pathconf)
4267 {
4268 	struct xdr_stream xdr;
4269 	struct compound_hdr hdr;
4270 	int status;
4271 
4272 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4273 	status = decode_compound_hdr(&xdr, &hdr);
4274 	if (!status)
4275 		status = decode_putfh(&xdr);
4276 	if (!status)
4277 		status = decode_pathconf(&xdr, pathconf);
4278 	return status;
4279 }
4280 
4281 /*
4282  * STATFS request
4283  */
4284 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, uint32_t *p, struct nfs_fsstat *fsstat)
4285 {
4286 	struct xdr_stream xdr;
4287 	struct compound_hdr hdr;
4288 	int status;
4289 
4290 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4291 	status = decode_compound_hdr(&xdr, &hdr);
4292 	if (!status)
4293 		status = decode_putfh(&xdr);
4294 	if (!status)
4295 		status = decode_statfs(&xdr, fsstat);
4296 	return status;
4297 }
4298 
4299 /*
4300  * GETATTR_BITMAP request
4301  */
4302 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req, uint32_t *p, struct nfs4_server_caps_res *res)
4303 {
4304 	struct xdr_stream xdr;
4305 	struct compound_hdr hdr;
4306 	int status;
4307 
4308 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4309 	if ((status = decode_compound_hdr(&xdr, &hdr)) != 0)
4310 		goto out;
4311 	if ((status = decode_putfh(&xdr)) != 0)
4312 		goto out;
4313 	status = decode_server_caps(&xdr, res);
4314 out:
4315 	return status;
4316 }
4317 
4318 /*
4319  * Decode RENEW response
4320  */
4321 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, uint32_t *p, void *dummy)
4322 {
4323 	struct xdr_stream xdr;
4324 	struct compound_hdr hdr;
4325 	int status;
4326 
4327 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4328 	status = decode_compound_hdr(&xdr, &hdr);
4329 	if (!status)
4330 		status = decode_renew(&xdr);
4331 	return status;
4332 }
4333 
4334 /*
4335  * a SETCLIENTID request
4336  */
4337 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req, uint32_t *p,
4338 		struct nfs4_client *clp)
4339 {
4340 	struct xdr_stream xdr;
4341 	struct compound_hdr hdr;
4342 	int status;
4343 
4344 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4345 	status = decode_compound_hdr(&xdr, &hdr);
4346 	if (!status)
4347 		status = decode_setclientid(&xdr, clp);
4348 	if (!status)
4349 		status = -nfs_stat_to_errno(hdr.status);
4350 	return status;
4351 }
4352 
4353 /*
4354  * a SETCLIENTID_CONFIRM request
4355  */
4356 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req, uint32_t *p, struct nfs_fsinfo *fsinfo)
4357 {
4358 	struct xdr_stream xdr;
4359 	struct compound_hdr hdr;
4360 	int status;
4361 
4362 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4363 	status = decode_compound_hdr(&xdr, &hdr);
4364 	if (!status)
4365 		status = decode_setclientid_confirm(&xdr);
4366 	if (!status)
4367 		status = decode_putrootfh(&xdr);
4368 	if (!status)
4369 		status = decode_fsinfo(&xdr, fsinfo);
4370 	if (!status)
4371 		status = -nfs_stat_to_errno(hdr.status);
4372 	return status;
4373 }
4374 
4375 /*
4376  * DELEGRETURN request
4377  */
4378 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp, uint32_t *p, struct nfs4_delegreturnres *res)
4379 {
4380 	struct xdr_stream xdr;
4381 	struct compound_hdr hdr;
4382 	int status;
4383 
4384 	xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
4385 	status = decode_compound_hdr(&xdr, &hdr);
4386 	if (status != 0)
4387 		goto out;
4388 	status = decode_putfh(&xdr);
4389 	if (status != 0)
4390 		goto out;
4391 	status = decode_delegreturn(&xdr);
4392 	decode_getfattr(&xdr, res->fattr, res->server);
4393 out:
4394 	return status;
4395 }
4396 
4397 /*
4398  * FS_LOCATIONS request
4399  */
4400 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, uint32_t *p, struct nfs4_fs_locations *res)
4401 {
4402 	struct xdr_stream xdr;
4403 	struct compound_hdr hdr;
4404 	int status;
4405 
4406 	xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
4407 	status = decode_compound_hdr(&xdr, &hdr);
4408 	if (status != 0)
4409 		goto out;
4410 	if ((status = decode_putfh(&xdr)) != 0)
4411 		goto out;
4412 	if ((status = decode_lookup(&xdr)) != 0)
4413 		goto out;
4414 	xdr_enter_page(&xdr, PAGE_SIZE);
4415 	status = decode_getfattr(&xdr, &res->fattr, res->server);
4416 out:
4417 	return status;
4418 }
4419 
4420 uint32_t *nfs4_decode_dirent(uint32_t *p, struct nfs_entry *entry, int plus)
4421 {
4422 	uint32_t bitmap[2] = {0};
4423 	uint32_t len;
4424 
4425 	if (!*p++) {
4426 		if (!*p)
4427 			return ERR_PTR(-EAGAIN);
4428 		entry->eof = 1;
4429 		return ERR_PTR(-EBADCOOKIE);
4430 	}
4431 
4432 	entry->prev_cookie = entry->cookie;
4433 	p = xdr_decode_hyper(p, &entry->cookie);
4434 	entry->len = ntohl(*p++);
4435 	entry->name = (const char *) p;
4436 	p += XDR_QUADLEN(entry->len);
4437 
4438 	/*
4439 	 * In case the server doesn't return an inode number,
4440 	 * we fake one here.  (We don't use inode number 0,
4441 	 * since glibc seems to choke on it...)
4442 	 */
4443 	entry->ino = 1;
4444 
4445 	len = ntohl(*p++);		/* bitmap length */
4446 	if (len-- > 0) {
4447 		bitmap[0] = ntohl(*p++);
4448 		if (len-- > 0) {
4449 			bitmap[1] = ntohl(*p++);
4450 			p += len;
4451 		}
4452 	}
4453 	len = XDR_QUADLEN(ntohl(*p++));	/* attribute buffer length */
4454 	if (len > 0) {
4455 		if (bitmap[0] & FATTR4_WORD0_RDATTR_ERROR) {
4456 			bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
4457 			/* Ignore the return value of rdattr_error for now */
4458 			p++;
4459 			len--;
4460 		}
4461 		if (bitmap[0] == 0 && bitmap[1] == FATTR4_WORD1_MOUNTED_ON_FILEID)
4462 			xdr_decode_hyper(p, &entry->ino);
4463 		else if (bitmap[0] == FATTR4_WORD0_FILEID)
4464 			xdr_decode_hyper(p, &entry->ino);
4465 		p += len;
4466 	}
4467 
4468 	entry->eof = !p[0] && p[1];
4469 	return p;
4470 }
4471 
4472 /*
4473  * We need to translate between nfs status return values and
4474  * the local errno values which may not be the same.
4475  */
4476 static struct {
4477 	int stat;
4478 	int errno;
4479 } nfs_errtbl[] = {
4480 	{ NFS4_OK,		0		},
4481 	{ NFS4ERR_PERM,		EPERM		},
4482 	{ NFS4ERR_NOENT,	ENOENT		},
4483 	{ NFS4ERR_IO,		errno_NFSERR_IO	},
4484 	{ NFS4ERR_NXIO,		ENXIO		},
4485 	{ NFS4ERR_ACCESS,	EACCES		},
4486 	{ NFS4ERR_EXIST,	EEXIST		},
4487 	{ NFS4ERR_XDEV,		EXDEV		},
4488 	{ NFS4ERR_NOTDIR,	ENOTDIR		},
4489 	{ NFS4ERR_ISDIR,	EISDIR		},
4490 	{ NFS4ERR_INVAL,	EINVAL		},
4491 	{ NFS4ERR_FBIG,		EFBIG		},
4492 	{ NFS4ERR_NOSPC,	ENOSPC		},
4493 	{ NFS4ERR_ROFS,		EROFS		},
4494 	{ NFS4ERR_MLINK,	EMLINK		},
4495 	{ NFS4ERR_NAMETOOLONG,	ENAMETOOLONG	},
4496 	{ NFS4ERR_NOTEMPTY,	ENOTEMPTY	},
4497 	{ NFS4ERR_DQUOT,	EDQUOT		},
4498 	{ NFS4ERR_STALE,	ESTALE		},
4499 	{ NFS4ERR_BADHANDLE,	EBADHANDLE	},
4500 	{ NFS4ERR_BADOWNER,	EINVAL		},
4501 	{ NFS4ERR_BADNAME,	EINVAL		},
4502 	{ NFS4ERR_BAD_COOKIE,	EBADCOOKIE	},
4503 	{ NFS4ERR_NOTSUPP,	ENOTSUPP	},
4504 	{ NFS4ERR_TOOSMALL,	ETOOSMALL	},
4505 	{ NFS4ERR_SERVERFAULT,	ESERVERFAULT	},
4506 	{ NFS4ERR_BADTYPE,	EBADTYPE	},
4507 	{ NFS4ERR_LOCKED,	EAGAIN		},
4508 	{ NFS4ERR_RESOURCE,	EREMOTEIO	},
4509 	{ NFS4ERR_SYMLINK,	ELOOP		},
4510 	{ NFS4ERR_OP_ILLEGAL,	EOPNOTSUPP	},
4511 	{ NFS4ERR_DEADLOCK,	EDEADLK		},
4512 	{ NFS4ERR_WRONGSEC,	EPERM		}, /* FIXME: this needs
4513 						    * to be handled by a
4514 						    * middle-layer.
4515 						    */
4516 	{ -1,			EIO		}
4517 };
4518 
4519 /*
4520  * Convert an NFS error code to a local one.
4521  * This one is used jointly by NFSv2 and NFSv3.
4522  */
4523 static int
4524 nfs_stat_to_errno(int stat)
4525 {
4526 	int i;
4527 	for (i = 0; nfs_errtbl[i].stat != -1; i++) {
4528 		if (nfs_errtbl[i].stat == stat)
4529 			return nfs_errtbl[i].errno;
4530 	}
4531 	if (stat <= 10000 || stat > 10100) {
4532 		/* The server is looney tunes. */
4533 		return ESERVERFAULT;
4534 	}
4535 	/* If we cannot translate the error, the recovery routines should
4536 	 * handle it.
4537 	 * Note: remaining NFSv4 error codes have values > 10000, so should
4538 	 * not conflict with native Linux error codes.
4539 	 */
4540 	return stat;
4541 }
4542 
4543 #ifndef MAX
4544 # define MAX(a, b)	(((a) > (b))? (a) : (b))
4545 #endif
4546 
4547 #define PROC(proc, argtype, restype)				\
4548 [NFSPROC4_CLNT_##proc] = {					\
4549 	.p_proc   = NFSPROC4_COMPOUND,				\
4550 	.p_encode = (kxdrproc_t) nfs4_xdr_##argtype,		\
4551 	.p_decode = (kxdrproc_t) nfs4_xdr_##restype,		\
4552 	.p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2,	\
4553 	.p_statidx = NFSPROC4_CLNT_##proc,			\
4554 	.p_name   = #proc,					\
4555     }
4556 
4557 struct rpc_procinfo	nfs4_procedures[] = {
4558   PROC(READ,		enc_read,	dec_read),
4559   PROC(WRITE,		enc_write,	dec_write),
4560   PROC(COMMIT,		enc_commit,	dec_commit),
4561   PROC(OPEN,		enc_open,	dec_open),
4562   PROC(OPEN_CONFIRM,	enc_open_confirm,	dec_open_confirm),
4563   PROC(OPEN_NOATTR,	enc_open_noattr,	dec_open_noattr),
4564   PROC(OPEN_DOWNGRADE,	enc_open_downgrade,	dec_open_downgrade),
4565   PROC(CLOSE,		enc_close,	dec_close),
4566   PROC(SETATTR,		enc_setattr,	dec_setattr),
4567   PROC(FSINFO,		enc_fsinfo,	dec_fsinfo),
4568   PROC(RENEW,		enc_renew,	dec_renew),
4569   PROC(SETCLIENTID,	enc_setclientid,	dec_setclientid),
4570   PROC(SETCLIENTID_CONFIRM,	enc_setclientid_confirm,	dec_setclientid_confirm),
4571   PROC(LOCK,            enc_lock,       dec_lock),
4572   PROC(LOCKT,           enc_lockt,      dec_lockt),
4573   PROC(LOCKU,           enc_locku,      dec_locku),
4574   PROC(ACCESS,		enc_access,	dec_access),
4575   PROC(GETATTR,		enc_getattr,	dec_getattr),
4576   PROC(LOOKUP,		enc_lookup,	dec_lookup),
4577   PROC(LOOKUP_ROOT,	enc_lookup_root,	dec_lookup_root),
4578   PROC(REMOVE,		enc_remove,	dec_remove),
4579   PROC(RENAME,		enc_rename,	dec_rename),
4580   PROC(LINK,		enc_link,	dec_link),
4581   PROC(SYMLINK,		enc_symlink,	dec_symlink),
4582   PROC(CREATE,		enc_create,	dec_create),
4583   PROC(PATHCONF,	enc_pathconf,	dec_pathconf),
4584   PROC(STATFS,		enc_statfs,	dec_statfs),
4585   PROC(READLINK,	enc_readlink,	dec_readlink),
4586   PROC(READDIR,		enc_readdir,	dec_readdir),
4587   PROC(SERVER_CAPS,	enc_server_caps, dec_server_caps),
4588   PROC(DELEGRETURN,	enc_delegreturn, dec_delegreturn),
4589   PROC(GETACL,		enc_getacl,	dec_getacl),
4590   PROC(SETACL,		enc_setacl,	dec_setacl),
4591   PROC(FS_LOCATIONS,	enc_fs_locations, dec_fs_locations),
4592 };
4593 
4594 struct rpc_version		nfs_version4 = {
4595 	.number			= 4,
4596 	.nrprocs		= ARRAY_SIZE(nfs4_procedures),
4597 	.procs			= nfs4_procedures
4598 };
4599 
4600 /*
4601  * Local variables:
4602  *  c-basic-offset: 8
4603  * End:
4604  */
4605