root/fs/nfs/nfs4xdr.c

DEFINITIONS

1. reserve_space
2. encode_opaque_fixed
3. encode_string
4. encode_uint32
5. encode_uint64
6. xdr_encode_bitmap4
7. mask_bitmap4
8. encode_nfs4_seqid
9. encode_compound_hdr
10. encode_op_hdr
11. encode_nops
12. encode_nfs4_stateid
13. encode_nfs4_verifier
14. xdr_encode_nfstime4
15. encode_attrs
16. encode_access
17. encode_close
18. encode_commit
19. encode_create
20. encode_getattr
21. encode_getfattr
22. encode_getfattr_open
23. encode_fsinfo
24. encode_fs_locations
25. encode_getfh
26. encode_link
27. nfs4_lock_type
28. nfs4_lock_length
29. encode_lockowner
30. encode_lock
31. encode_lockt
32. encode_locku
33. encode_release_lockowner
34. encode_lookup
35. encode_lookupp
36. encode_share_access
37. encode_openhdr
38. encode_createmode
39. encode_opentype
40. encode_delegation_type
41. encode_claim_null
42. encode_claim_previous
43. encode_claim_delegate_cur
44. encode_claim_fh
45. encode_claim_delegate_cur_fh
46. encode_open
47. encode_open_confirm
48. encode_open_downgrade
49. encode_putfh
50. encode_putrootfh
51. encode_read
52. encode_readdir
53. encode_readlink
54. encode_remove
55. encode_rename
56. encode_renew
57. encode_restorefh
58. encode_setacl
59. encode_savefh
60. encode_setattr
61. encode_setclientid
62. encode_setclientid_confirm
63. encode_write
64. encode_delegreturn
65. encode_secinfo
66. encode_bind_conn_to_session
67. encode_op_map
68. encode_exchange_id
69. encode_create_session
70. encode_destroy_session
71. encode_destroy_clientid
72. encode_reclaim_complete
73. encode_sequence
74. encode_getdeviceinfo
75. encode_layoutget
76. encode_layoutcommit
77. encode_layoutreturn
78. encode_secinfo_no_name
79. encode_test_stateid
80. encode_free_stateid
81. encode_layoutreturn
82. encode_layoutget
83. nfs4_xdr_minorversion
84. nfs4_xdr_enc_access
85. nfs4_xdr_enc_lookup
86. nfs4_xdr_enc_lookupp
87. nfs4_xdr_enc_lookup_root
88. nfs4_xdr_enc_remove
89. nfs4_xdr_enc_rename
90. nfs4_xdr_enc_link
91. nfs4_xdr_enc_create
92. nfs4_xdr_enc_symlink
93. nfs4_xdr_enc_getattr
94. nfs4_xdr_enc_close
95. nfs4_xdr_enc_open
96. nfs4_xdr_enc_open_confirm
97. nfs4_xdr_enc_open_noattr
98. nfs4_xdr_enc_open_downgrade
99. nfs4_xdr_enc_lock
100. nfs4_xdr_enc_lockt
101. nfs4_xdr_enc_locku
102. nfs4_xdr_enc_release_lockowner
103. nfs4_xdr_enc_readlink
104. nfs4_xdr_enc_readdir
105. nfs4_xdr_enc_read
106. nfs4_xdr_enc_setattr
107. nfs4_xdr_enc_getacl
108. nfs4_xdr_enc_write
109. nfs4_xdr_enc_commit
110. nfs4_xdr_enc_fsinfo
111. nfs4_xdr_enc_pathconf
112. nfs4_xdr_enc_statfs
113. nfs4_xdr_enc_server_caps
114. nfs4_xdr_enc_renew
115. nfs4_xdr_enc_setclientid
116. nfs4_xdr_enc_setclientid_confirm
117. nfs4_xdr_enc_delegreturn
118. nfs4_xdr_enc_fs_locations
119. nfs4_xdr_enc_secinfo
120. nfs4_xdr_enc_fsid_present
121. nfs4_xdr_enc_bind_conn_to_session
122. nfs4_xdr_enc_exchange_id
123. nfs4_xdr_enc_create_session
124. nfs4_xdr_enc_destroy_session
125. nfs4_xdr_enc_destroy_clientid
126. nfs4_xdr_enc_sequence
127. nfs4_xdr_enc_get_lease_time
128. nfs4_xdr_enc_reclaim_complete
129. nfs4_xdr_enc_getdeviceinfo
130. nfs4_xdr_enc_layoutget
131. nfs4_xdr_enc_layoutcommit
132. nfs4_xdr_enc_layoutreturn
133. nfs4_xdr_enc_secinfo_no_name
134. nfs4_xdr_enc_test_stateid
135. nfs4_xdr_enc_free_stateid
136. decode_opaque_inline
137. decode_compound_hdr
138. __decode_op_hdr
139. decode_op_hdr
140. decode_ace
141. decode_bitmap4
142. decode_attr_bitmap
143. decode_attr_length
144. decode_attr_supported
145. decode_attr_type
146. decode_attr_fh_expire_type
147. decode_attr_change
148. decode_attr_size
149. decode_attr_link_support
150. decode_attr_symlink_support
151. decode_attr_fsid
152. decode_attr_lease_time
153. decode_attr_error
154. decode_attr_exclcreat_supported
155. decode_attr_filehandle
156. decode_attr_aclsupport
157. decode_attr_fileid
158. decode_attr_mounted_on_fileid
159. decode_attr_files_avail
160. decode_attr_files_free
161. decode_attr_files_total
162. decode_pathname
163. decode_attr_fs_locations
164. decode_attr_maxfilesize
165. decode_attr_maxlink
166. decode_attr_maxname
167. decode_attr_maxread
168. decode_attr_maxwrite
169. decode_attr_mode
170. decode_attr_nlink
171. decode_nfs4_string
172. decode_attr_owner
173. decode_attr_group
174. decode_attr_rdev
175. decode_attr_space_avail
176. decode_attr_space_free
177. decode_attr_space_total
178. decode_attr_space_used
179. xdr_decode_nfstime4
180. decode_attr_time
181. decode_attr_time_access
182. decode_attr_time_metadata
183. decode_attr_time_delta
184. decode_attr_security_label
185. decode_attr_time_modify
186. verify_attr_len
187. decode_change_info
188. decode_access
189. decode_opaque_fixed
190. decode_stateid
191. decode_open_stateid
192. decode_lock_stateid
193. decode_delegation_stateid
194. decode_invalid_stateid
195. decode_close
196. decode_verifier
197. decode_write_verifier
198. decode_commit
199. decode_create
200. decode_server_caps
201. decode_statfs
202. decode_pathconf
203. decode_threshold_hint
204. decode_first_threshold_item4
205. decode_attr_mdsthreshold
206. decode_getfattr_attrs
207. decode_getfattr_generic
208. decode_getfattr_label
209. decode_getfattr
210. decode_pnfs_layout_types
211. decode_attr_pnfstype
212. decode_attr_layout_blksize
213. decode_attr_clone_blksize
214. decode_fsinfo
215. decode_getfh
216. decode_link
217. decode_lock_denied
218. decode_lock
219. decode_lockt
220. decode_locku
221. decode_release_lockowner
222. decode_lookup
223. decode_lookupp
224. decode_space_limit
225. decode_rw_delegation
226. decode_no_delegation
227. decode_delegation
228. decode_open
229. decode_open_confirm
230. decode_open_downgrade
231. decode_putfh
232. decode_putrootfh
233. decode_read
234. decode_readdir
235. decode_readlink
236. decode_remove
237. decode_rename
238. decode_renew
239. decode_restorefh
240. decode_getacl
241. decode_savefh
242. decode_setattr
243. decode_setclientid
244. decode_setclientid_confirm
245. decode_write
246. decode_delegreturn
247. decode_secinfo_gss
248. decode_secinfo_common
249. decode_secinfo
250. decode_secinfo_no_name
251. decode_op_map
252. decode_exchange_id
253. decode_chan_attrs
254. decode_sessionid
255. decode_bind_conn_to_session
256. decode_create_session
257. decode_destroy_session
258. decode_destroy_clientid
259. decode_reclaim_complete
260. decode_sequence
261. decode_layout_stateid
262. decode_getdeviceinfo
263. decode_layoutget
264. decode_layoutreturn
265. decode_layoutcommit
266. decode_test_stateid
267. decode_free_stateid
268. decode_layoutreturn
269. decode_layoutget
270. nfs4_xdr_dec_open_downgrade
271. nfs4_xdr_dec_access
272. nfs4_xdr_dec_lookup
273. nfs4_xdr_dec_lookupp
274. nfs4_xdr_dec_lookup_root
275. nfs4_xdr_dec_remove
276. nfs4_xdr_dec_rename
277. nfs4_xdr_dec_link
278. nfs4_xdr_dec_create
279. nfs4_xdr_dec_symlink
280. nfs4_xdr_dec_getattr
281. nfs4_xdr_enc_setacl
282. nfs4_xdr_dec_setacl
283. nfs4_xdr_dec_getacl
284. nfs4_xdr_dec_close
285. nfs4_xdr_dec_open
286. nfs4_xdr_dec_open_confirm
287. nfs4_xdr_dec_open_noattr
288. nfs4_xdr_dec_setattr
289. nfs4_xdr_dec_lock
290. nfs4_xdr_dec_lockt
291. nfs4_xdr_dec_locku
292. nfs4_xdr_dec_release_lockowner
293. nfs4_xdr_dec_readlink
294. nfs4_xdr_dec_readdir
295. nfs4_xdr_dec_read
296. nfs4_xdr_dec_write
297. nfs4_xdr_dec_commit
298. nfs4_xdr_dec_fsinfo
299. nfs4_xdr_dec_pathconf
300. nfs4_xdr_dec_statfs
301. nfs4_xdr_dec_server_caps
302. nfs4_xdr_dec_renew
303. nfs4_xdr_dec_setclientid
304. nfs4_xdr_dec_setclientid_confirm
305. nfs4_xdr_dec_delegreturn
306. nfs4_xdr_dec_fs_locations
307. nfs4_xdr_dec_secinfo
308. nfs4_xdr_dec_fsid_present
309. nfs4_xdr_dec_bind_conn_to_session
310. nfs4_xdr_dec_exchange_id
311. nfs4_xdr_dec_create_session
312. nfs4_xdr_dec_destroy_session
313. nfs4_xdr_dec_destroy_clientid
314. nfs4_xdr_dec_sequence
315. nfs4_xdr_dec_get_lease_time
316. nfs4_xdr_dec_reclaim_complete
317. nfs4_xdr_dec_getdeviceinfo
318. nfs4_xdr_dec_layoutget
319. nfs4_xdr_dec_layoutreturn
320. nfs4_xdr_dec_layoutcommit
321. nfs4_xdr_dec_secinfo_no_name
322. nfs4_xdr_dec_test_stateid
323. nfs4_xdr_dec_free_stateid
324. nfs4_decode_dirent
325. nfs4_stat_to_errno

   1 /*
   2  *  fs/nfs/nfs4xdr.c
   3  *
   4  *  Client-side XDR for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37 
  38 #include <linux/param.h>
  39 #include <linux/time.h>
  40 #include <linux/mm.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/in.h>
  44 #include <linux/pagemap.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/kdev_t.h>
  47 #include <linux/module.h>
  48 #include <linux/utsname.h>
  49 #include <linux/sunrpc/clnt.h>
  50 #include <linux/sunrpc/msg_prot.h>
  51 #include <linux/sunrpc/gss_api.h>
  52 #include <linux/nfs.h>
  53 #include <linux/nfs4.h>
  54 #include <linux/nfs_fs.h>
  55 
  56 #include "nfs4_fs.h"
  57 #include "nfs4trace.h"
  58 #include "internal.h"
  59 #include "nfs4idmap.h"
  60 #include "nfs4session.h"
  61 #include "pnfs.h"
  62 #include "netns.h"
  63 
  64 #define NFSDBG_FACILITY         NFSDBG_XDR
  65 
  66 /* Mapping from NFS error code to "errno" error code. */
  67 #define errno_NFSERR_IO         EIO
  68 
  69 struct compound_hdr;
  70 static int nfs4_stat_to_errno(int);
  71 static void encode_layoutget(struct xdr_stream *xdr,
  72                              const struct nfs4_layoutget_args *args,
  73                              struct compound_hdr *hdr);
  74 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
  75                              struct nfs4_layoutget_res *res);
  76 
  77 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
  78 #ifdef DEBUG
  79 #define NFS4_MAXTAGLEN          20
  80 #else
  81 #define NFS4_MAXTAGLEN          0
  82 #endif
  83 
  84 /* lock,open owner id:
  85  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
  86  */
  87 #define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
  88 #define lock_owner_id_maxsz     (1 + 1 + 4)
  89 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
  90 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
  91 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
  92 #define op_encode_hdr_maxsz     (1)
  93 #define op_decode_hdr_maxsz     (2)
  94 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
  95 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
  96 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  97 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
  98 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
  99                                 (NFS4_FHSIZE >> 2))
 100 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
 101 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
 102 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
 103 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
 104 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
 105                                 ((3+NFS4_FHSIZE) >> 2))
 106 #define nfs4_fattr_bitmap_maxsz 4
 107 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
 108 #define nfstime4_maxsz          (3)
 109 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
 110 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
 111 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 112 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 113 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 114 /* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
 115 #define nfs4_label_maxsz        (4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
 116 #else
 117 #define nfs4_label_maxsz        0
 118 #endif
 119 /* We support only one layout type per file system */
 120 #define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
 121 /* This is based on getfattr, which uses the most attributes: */
 122 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
 123                                 3*nfstime4_maxsz + \
 124                                 nfs4_owner_maxsz + \
 125                                 nfs4_group_maxsz + nfs4_label_maxsz + \
 126                                  decode_mdsthreshold_maxsz))
 127 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
 128                                 nfs4_fattr_value_maxsz)
 129 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
 130 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
 131                                  1 + 2 + 1 + \
 132                                 nfs4_owner_maxsz + \
 133                                 nfs4_group_maxsz + \
 134                                 nfs4_label_maxsz + \
 135                                 1 + nfstime4_maxsz + \
 136                                 1 + nfstime4_maxsz)
 137 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
 138 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
 139 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
 140 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
 141 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
 142 /* The 5 accounts for the PNFS attributes, and assumes that at most three
 143  * layout types will be returned.
 144  */
 145 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
 146                                  nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
 147 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
 148 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
 149 #define encode_setclientid_maxsz \
 150                                 (op_encode_hdr_maxsz + \
 151                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
 152                                 /* client name */ \
 153                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
 154                                 1 /* sc_prog */ + \
 155                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
 156                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
 157                                 1) /* sc_cb_ident */
 158 #define decode_setclientid_maxsz \
 159                                 (op_decode_hdr_maxsz + \
 160                                 2 /* clientid */ + \
 161                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
 162                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
 163                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
 164 #define encode_setclientid_confirm_maxsz \
 165                                 (op_encode_hdr_maxsz + \
 166                                 3 + (NFS4_VERIFIER_SIZE >> 2))
 167 #define decode_setclientid_confirm_maxsz \
 168                                 (op_decode_hdr_maxsz)
 169 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
 170 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
 171 #define encode_lookupp_maxsz    (op_encode_hdr_maxsz)
 172 #define decode_lookupp_maxsz    (op_decode_hdr_maxsz)
 173 #define encode_share_access_maxsz \
 174                                 (2)
 175 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
 176 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
 177 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
 178 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
 179                                 2 + encode_share_access_maxsz + 2 + \
 180                                 open_owner_id_maxsz + \
 181                                 encode_opentype_maxsz + \
 182                                 encode_claim_null_maxsz)
 183 #define decode_space_limit_maxsz        (3)
 184 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
 185 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
 186                                 decode_space_limit_maxsz + \
 187                                 decode_ace_maxsz)
 188 #define decode_change_info_maxsz        (5)
 189 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
 190                                 decode_stateid_maxsz + \
 191                                 decode_change_info_maxsz + 1 + \
 192                                 nfs4_fattr_bitmap_maxsz + \
 193                                 decode_delegation_maxsz)
 194 #define encode_open_confirm_maxsz \
 195                                 (op_encode_hdr_maxsz + \
 196                                  encode_stateid_maxsz + 1)
 197 #define decode_open_confirm_maxsz \
 198                                 (op_decode_hdr_maxsz + \
 199                                  decode_stateid_maxsz)
 200 #define encode_open_downgrade_maxsz \
 201                                 (op_encode_hdr_maxsz + \
 202                                  encode_stateid_maxsz + 1 + \
 203                                  encode_share_access_maxsz)
 204 #define decode_open_downgrade_maxsz \
 205                                 (op_decode_hdr_maxsz + \
 206                                  decode_stateid_maxsz)
 207 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
 208                                  1 + encode_stateid_maxsz)
 209 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
 210                                  decode_stateid_maxsz)
 211 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
 212                                  encode_stateid_maxsz + \
 213                                  encode_attrs_maxsz)
 214 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
 215                                  nfs4_fattr_bitmap_maxsz)
 216 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
 217                                  encode_stateid_maxsz + 3)
 218 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2 + 1)
 219 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
 220                                  2 + encode_verifier_maxsz + 5 + \
 221                                 nfs4_label_maxsz)
 222 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
 223                                  decode_verifier_maxsz + 1)
 224 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
 225 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1 + 1)
 226 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
 227                                  encode_stateid_maxsz + 4)
 228 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
 229                                  2 + decode_verifier_maxsz)
 230 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
 231 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
 232                                  decode_verifier_maxsz)
 233 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
 234                                 nfs4_name_maxsz)
 235 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
 236                                  decode_change_info_maxsz)
 237 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
 238                                 2 * nfs4_name_maxsz)
 239 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
 240                                  decode_change_info_maxsz + \
 241                                  decode_change_info_maxsz)
 242 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
 243                                 nfs4_name_maxsz)
 244 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
 245 #define encode_lockowner_maxsz  (7)
 246 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
 247                                  7 + \
 248                                  1 + encode_stateid_maxsz + 1 + \
 249                                  encode_lockowner_maxsz)
 250 #define decode_lock_denied_maxsz \
 251                                 (8 + decode_lockowner_maxsz)
 252 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
 253                                  decode_lock_denied_maxsz)
 254 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
 255                                 encode_lockowner_maxsz)
 256 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
 257                                  decode_lock_denied_maxsz)
 258 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
 259                                  encode_stateid_maxsz + \
 260                                  4)
 261 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
 262                                  decode_stateid_maxsz)
 263 #define encode_release_lockowner_maxsz \
 264                                 (op_encode_hdr_maxsz + \
 265                                  encode_lockowner_maxsz)
 266 #define decode_release_lockowner_maxsz \
 267                                 (op_decode_hdr_maxsz)
 268 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
 269 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
 270 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
 271                                 1 + nfs4_name_maxsz + \
 272                                 1 + \
 273                                 nfs4_fattr_maxsz)
 274 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
 275 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
 276                                 1 + 2 + nfs4_name_maxsz + \
 277                                 encode_attrs_maxsz)
 278 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
 279                                 decode_change_info_maxsz + \
 280                                 nfs4_fattr_bitmap_maxsz)
 281 #define encode_statfs_maxsz     (encode_getattr_maxsz)
 282 #define decode_statfs_maxsz     (decode_getattr_maxsz)
 283 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
 284 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
 285 #define encode_getacl_maxsz     (encode_getattr_maxsz)
 286 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
 287                                  nfs4_fattr_bitmap_maxsz + 1 + 1)
 288 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
 289                                  encode_stateid_maxsz + 3)
 290 #define decode_setacl_maxsz     (decode_setattr_maxsz)
 291 #define encode_fs_locations_maxsz \
 292                                 (encode_getattr_maxsz)
 293 #define decode_fs_locations_maxsz \
 294                                 (1)
 295 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
 296 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
 297 
 298 #if defined(CONFIG_NFS_V4_1)
 299 #define NFS4_MAX_MACHINE_NAME_LEN (64)
 300 #define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
 301                          sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
 302 
 303 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
 304                                 encode_verifier_maxsz + \
 305                                 1 /* co_ownerid.len */ + \
 306                                 /* eia_clientowner */ \
 307                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
 308                                 1 /* flags */ + \
 309                                 1 /* spa_how */ + \
 310                                 /* max is SP4_MACH_CRED (for now) */ + \
 311                                 1 + NFS4_OP_MAP_NUM_WORDS + \
 312                                 1 + NFS4_OP_MAP_NUM_WORDS + \
 313                                 1 /* implementation id array of size 1 */ + \
 314                                 1 /* nii_domain */ + \
 315                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
 316                                 1 /* nii_name */ + \
 317                                 XDR_QUADLEN(IMPL_NAME_LIMIT) + \
 318                                 3 /* nii_date */)
 319 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
 320                                 2 /* eir_clientid */ + \
 321                                 1 /* eir_sequenceid */ + \
 322                                 1 /* eir_flags */ + \
 323                                 1 /* spr_how */ + \
 324                                   /* max is SP4_MACH_CRED (for now) */ + \
 325                                 1 + NFS4_OP_MAP_NUM_WORDS + \
 326                                 1 + NFS4_OP_MAP_NUM_WORDS + \
 327                                 2 /* eir_server_owner.so_minor_id */ + \
 328                                 /* eir_server_owner.so_major_id<> */ \
 329                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 330                                 /* eir_server_scope<> */ \
 331                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
 332                                 1 /* eir_server_impl_id array length */ + \
 333                                 1 /* nii_domain */ + \
 334                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
 335                                 1 /* nii_name */ + \
 336                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
 337                                 3 /* nii_date */)
 338 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
 339 #define decode_channel_attrs_maxsz  (6 + \
 340                                      1 /* ca_rdma_ird.len */ + \
 341                                      1 /* ca_rdma_ird */)
 342 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
 343                                      2 /* csa_clientid */ + \
 344                                      1 /* csa_sequence */ + \
 345                                      1 /* csa_flags */ + \
 346                                      encode_channel_attrs_maxsz + \
 347                                      encode_channel_attrs_maxsz + \
 348                                      1 /* csa_cb_program */ + \
 349                                      1 /* csa_sec_parms.len (1) */ + \
 350                                      1 /* cb_secflavor (AUTH_SYS) */ + \
 351                                      1 /* stamp */ + \
 352                                      1 /* machinename.len */ + \
 353                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
 354                                      1 /* uid */ + \
 355                                      1 /* gid */ + \
 356                                      1 /* gids.len (0) */)
 357 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
 358                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
 359                                      1 /* csr_sequence */ + \
 360                                      1 /* csr_flags */ + \
 361                                      decode_channel_attrs_maxsz + \
 362                                      decode_channel_attrs_maxsz)
 363 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
 364                                      /* bctsa_sessid */ \
 365                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
 366                                      1 /* bctsa_dir */ + \
 367                                      1 /* bctsa_use_conn_in_rdma_mode */)
 368 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
 369                                      /* bctsr_sessid */ \
 370                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
 371                                      1 /* bctsr_dir */ + \
 372                                      1 /* bctsr_use_conn_in_rdma_mode */)
 373 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
 374 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
 375 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
 376 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
 377 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
 378                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
 379 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
 380                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
 381 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
 382 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
 383 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
 384                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
 385                                 1 /* layout type */ + \
 386                                 1 /* maxcount */ + \
 387                                 1 /* bitmap size */ + \
 388                                 1 /* notification bitmap length */ + \
 389                                 1 /* notification bitmap, word 0 */)
 390 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
 391                                 1 /* layout type */ + \
 392                                 1 /* opaque devaddr4 length */ + \
 393                                   /* devaddr4 payload is read into page */ \
 394                                 1 /* notification bitmap length */ + \
 395                                 1 /* notification bitmap, word 0 */ + \
 396                                 1 /* possible XDR padding */)
 397 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
 398                                 encode_stateid_maxsz)
 399 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
 400                                 decode_stateid_maxsz + \
 401                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE) + 1)
 402 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
 403                                 2 /* offset */ + \
 404                                 2 /* length */ + \
 405                                 1 /* reclaim */ + \
 406                                 encode_stateid_maxsz + \
 407                                 1 /* new offset (true) */ + \
 408                                 2 /* last byte written */ + \
 409                                 1 /* nt_timechanged (false) */ + \
 410                                 1 /* layoutupdate4 layout type */ + \
 411                                 1 /* layoutupdate4 opaqueue len */)
 412                                   /* the actual content of layoutupdate4 should
 413                                      be allocated by drivers and spliced in
 414                                      using xdr_write_pages */
 415 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
 416 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
 417                                 encode_stateid_maxsz + \
 418                                 1 + \
 419                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
 420 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
 421                                 1 + decode_stateid_maxsz)
 422 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
 423 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
 424 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
 425                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
 426 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
 427 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
 428                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
 429 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz)
 430 #else /* CONFIG_NFS_V4_1 */
 431 #define encode_sequence_maxsz   0
 432 #define decode_sequence_maxsz   0
 433 #define encode_layoutreturn_maxsz 0
 434 #define decode_layoutreturn_maxsz 0
 435 #define encode_layoutget_maxsz  0
 436 #define decode_layoutget_maxsz  0
 437 #endif /* CONFIG_NFS_V4_1 */
 438 
 439 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
 440 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
 441 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
 442                                 encode_sequence_maxsz + \
 443                                 encode_putfh_maxsz + \
 444                                 encode_read_maxsz)
 445 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
 446                                 decode_sequence_maxsz + \
 447                                 decode_putfh_maxsz + \
 448                                 decode_read_maxsz)
 449 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
 450                                 encode_sequence_maxsz + \
 451                                 encode_putfh_maxsz + \
 452                                 encode_readlink_maxsz)
 453 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
 454                                 decode_sequence_maxsz + \
 455                                 decode_putfh_maxsz + \
 456                                 decode_readlink_maxsz)
 457 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
 458                                 encode_sequence_maxsz + \
 459                                 encode_putfh_maxsz + \
 460                                 encode_readdir_maxsz)
 461 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
 462                                 decode_sequence_maxsz + \
 463                                 decode_putfh_maxsz + \
 464                                 decode_readdir_maxsz)
 465 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
 466                                 encode_sequence_maxsz + \
 467                                 encode_putfh_maxsz + \
 468                                 encode_write_maxsz + \
 469                                 encode_getattr_maxsz)
 470 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
 471                                 decode_sequence_maxsz + \
 472                                 decode_putfh_maxsz + \
 473                                 decode_write_maxsz + \
 474                                 decode_getattr_maxsz)
 475 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
 476                                 encode_sequence_maxsz + \
 477                                 encode_putfh_maxsz + \
 478                                 encode_commit_maxsz)
 479 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
 480                                 decode_sequence_maxsz + \
 481                                 decode_putfh_maxsz + \
 482                                 decode_commit_maxsz)
 483 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
 484                                 encode_sequence_maxsz + \
 485                                 encode_putfh_maxsz + \
 486                                 encode_open_maxsz + \
 487                                 encode_access_maxsz + \
 488                                 encode_getfh_maxsz + \
 489                                 encode_getattr_maxsz + \
 490                                 encode_layoutget_maxsz)
 491 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
 492                                 decode_sequence_maxsz + \
 493                                 decode_putfh_maxsz + \
 494                                 decode_open_maxsz + \
 495                                 decode_access_maxsz + \
 496                                 decode_getfh_maxsz + \
 497                                 decode_getattr_maxsz + \
 498                                 decode_layoutget_maxsz)
 499 #define NFS4_enc_open_confirm_sz \
 500                                 (compound_encode_hdr_maxsz + \
 501                                  encode_putfh_maxsz + \
 502                                  encode_open_confirm_maxsz)
 503 #define NFS4_dec_open_confirm_sz \
 504                                 (compound_decode_hdr_maxsz + \
 505                                  decode_putfh_maxsz + \
 506                                  decode_open_confirm_maxsz)
 507 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
 508                                         encode_sequence_maxsz + \
 509                                         encode_putfh_maxsz + \
 510                                         encode_open_maxsz + \
 511                                         encode_access_maxsz + \
 512                                         encode_getattr_maxsz + \
 513                                         encode_layoutget_maxsz)
 514 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
 515                                         decode_sequence_maxsz + \
 516                                         decode_putfh_maxsz + \
 517                                         decode_open_maxsz + \
 518                                         decode_access_maxsz + \
 519                                         decode_getattr_maxsz + \
 520                                         decode_layoutget_maxsz)
 521 #define NFS4_enc_open_downgrade_sz \
 522                                 (compound_encode_hdr_maxsz + \
 523                                  encode_sequence_maxsz + \
 524                                  encode_putfh_maxsz + \
 525                                  encode_layoutreturn_maxsz + \
 526                                  encode_open_downgrade_maxsz)
 527 #define NFS4_dec_open_downgrade_sz \
 528                                 (compound_decode_hdr_maxsz + \
 529                                  decode_sequence_maxsz + \
 530                                  decode_putfh_maxsz + \
 531                                  decode_layoutreturn_maxsz + \
 532                                  decode_open_downgrade_maxsz)
 533 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
 534                                  encode_sequence_maxsz + \
 535                                  encode_putfh_maxsz + \
 536                                  encode_layoutreturn_maxsz + \
 537                                  encode_close_maxsz + \
 538                                  encode_getattr_maxsz)
 539 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
 540                                  decode_sequence_maxsz + \
 541                                  decode_putfh_maxsz + \
 542                                  decode_layoutreturn_maxsz + \
 543                                  decode_close_maxsz + \
 544                                  decode_getattr_maxsz)
 545 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
 546                                  encode_sequence_maxsz + \
 547                                  encode_putfh_maxsz + \
 548                                  encode_setattr_maxsz + \
 549                                  encode_getattr_maxsz)
 550 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
 551                                  decode_sequence_maxsz + \
 552                                  decode_putfh_maxsz + \
 553                                  decode_setattr_maxsz + \
 554                                  decode_getattr_maxsz)
 555 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
 556                                 encode_sequence_maxsz + \
 557                                 encode_putfh_maxsz + \
 558                                 encode_fsinfo_maxsz)
 559 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
 560                                 decode_sequence_maxsz + \
 561                                 decode_putfh_maxsz + \
 562                                 decode_fsinfo_maxsz)
 563 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
 564                                 encode_renew_maxsz)
 565 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
 566                                 decode_renew_maxsz)
 567 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
 568                                 encode_setclientid_maxsz)
 569 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
 570                                 decode_setclientid_maxsz)
 571 #define NFS4_enc_setclientid_confirm_sz \
 572                                 (compound_encode_hdr_maxsz + \
 573                                 encode_setclientid_confirm_maxsz)
 574 #define NFS4_dec_setclientid_confirm_sz \
 575                                 (compound_decode_hdr_maxsz + \
 576                                 decode_setclientid_confirm_maxsz)
 577 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
 578                                 encode_sequence_maxsz + \
 579                                 encode_putfh_maxsz + \
 580                                 encode_lock_maxsz)
 581 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
 582                                 decode_sequence_maxsz + \
 583                                 decode_putfh_maxsz + \
 584                                 decode_lock_maxsz)
 585 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
 586                                 encode_sequence_maxsz + \
 587                                 encode_putfh_maxsz + \
 588                                 encode_lockt_maxsz)
 589 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
 590                                  decode_sequence_maxsz + \
 591                                  decode_putfh_maxsz + \
 592                                  decode_lockt_maxsz)
 593 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
 594                                 encode_sequence_maxsz + \
 595                                 encode_putfh_maxsz + \
 596                                 encode_locku_maxsz)
 597 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
 598                                 decode_sequence_maxsz + \
 599                                 decode_putfh_maxsz + \
 600                                 decode_locku_maxsz)
 601 #define NFS4_enc_release_lockowner_sz \
 602                                 (compound_encode_hdr_maxsz + \
 603                                  encode_lockowner_maxsz)
 604 #define NFS4_dec_release_lockowner_sz \
 605                                 (compound_decode_hdr_maxsz + \
 606                                  decode_lockowner_maxsz)
 607 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
 608                                 encode_sequence_maxsz + \
 609                                 encode_putfh_maxsz + \
 610                                 encode_access_maxsz + \
 611                                 encode_getattr_maxsz)
 612 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
 613                                 decode_sequence_maxsz + \
 614                                 decode_putfh_maxsz + \
 615                                 decode_access_maxsz + \
 616                                 decode_getattr_maxsz)
 617 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
 618                                 encode_sequence_maxsz + \
 619                                 encode_putfh_maxsz + \
 620                                 encode_getattr_maxsz + \
 621                                 encode_renew_maxsz)
 622 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
 623                                 decode_sequence_maxsz + \
 624                                 decode_putfh_maxsz + \
 625                                 decode_getattr_maxsz + \
 626                                 decode_renew_maxsz)
 627 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
 628                                 encode_sequence_maxsz + \
 629                                 encode_putfh_maxsz + \
 630                                 encode_lookup_maxsz + \
 631                                 encode_getattr_maxsz + \
 632                                 encode_getfh_maxsz)
 633 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
 634                                 decode_sequence_maxsz + \
 635                                 decode_putfh_maxsz + \
 636                                 decode_lookup_maxsz + \
 637                                 decode_getattr_maxsz + \
 638                                 decode_getfh_maxsz)
 639 #define NFS4_enc_lookupp_sz     (compound_encode_hdr_maxsz + \
 640                                 encode_sequence_maxsz + \
 641                                 encode_putfh_maxsz + \
 642                                 encode_lookupp_maxsz + \
 643                                 encode_getattr_maxsz + \
 644                                 encode_getfh_maxsz)
 645 #define NFS4_dec_lookupp_sz     (compound_decode_hdr_maxsz + \
 646                                 decode_sequence_maxsz + \
 647                                 decode_putfh_maxsz + \
 648                                 decode_lookupp_maxsz + \
 649                                 decode_getattr_maxsz + \
 650                                 decode_getfh_maxsz)
 651 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
 652                                 encode_sequence_maxsz + \
 653                                 encode_putrootfh_maxsz + \
 654                                 encode_getattr_maxsz + \
 655                                 encode_getfh_maxsz)
 656 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
 657                                 decode_sequence_maxsz + \
 658                                 decode_putrootfh_maxsz + \
 659                                 decode_getattr_maxsz + \
 660                                 decode_getfh_maxsz)
 661 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
 662                                 encode_sequence_maxsz + \
 663                                 encode_putfh_maxsz + \
 664                                 encode_remove_maxsz)
 665 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
 666                                 decode_sequence_maxsz + \
 667                                 decode_putfh_maxsz + \
 668                                 decode_remove_maxsz)
 669 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
 670                                 encode_sequence_maxsz + \
 671                                 encode_putfh_maxsz + \
 672                                 encode_savefh_maxsz + \
 673                                 encode_putfh_maxsz + \
 674                                 encode_rename_maxsz)
 675 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
 676                                 decode_sequence_maxsz + \
 677                                 decode_putfh_maxsz + \
 678                                 decode_savefh_maxsz + \
 679                                 decode_putfh_maxsz + \
 680                                 decode_rename_maxsz)
 681 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
 682                                 encode_sequence_maxsz + \
 683                                 encode_putfh_maxsz + \
 684                                 encode_savefh_maxsz + \
 685                                 encode_putfh_maxsz + \
 686                                 encode_link_maxsz + \
 687                                 encode_restorefh_maxsz + \
 688                                 encode_getattr_maxsz)
 689 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
 690                                 decode_sequence_maxsz + \
 691                                 decode_putfh_maxsz + \
 692                                 decode_savefh_maxsz + \
 693                                 decode_putfh_maxsz + \
 694                                 decode_link_maxsz + \
 695                                 decode_restorefh_maxsz + \
 696                                 decode_getattr_maxsz)
 697 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
 698                                 encode_sequence_maxsz + \
 699                                 encode_putfh_maxsz + \
 700                                 encode_symlink_maxsz + \
 701                                 encode_getattr_maxsz + \
 702                                 encode_getfh_maxsz)
 703 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
 704                                 decode_sequence_maxsz + \
 705                                 decode_putfh_maxsz + \
 706                                 decode_symlink_maxsz + \
 707                                 decode_getattr_maxsz + \
 708                                 decode_getfh_maxsz)
 709 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
 710                                 encode_sequence_maxsz + \
 711                                 encode_putfh_maxsz + \
 712                                 encode_create_maxsz + \
 713                                 encode_getfh_maxsz + \
 714                                 encode_getattr_maxsz)
 715 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
 716                                 decode_sequence_maxsz + \
 717                                 decode_putfh_maxsz + \
 718                                 decode_create_maxsz + \
 719                                 decode_getfh_maxsz + \
 720                                 decode_getattr_maxsz)
 721 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
 722                                 encode_sequence_maxsz + \
 723                                 encode_putfh_maxsz + \
 724                                 encode_getattr_maxsz)
 725 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
 726                                 decode_sequence_maxsz + \
 727                                 decode_putfh_maxsz + \
 728                                 decode_getattr_maxsz)
 729 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
 730                                 encode_sequence_maxsz + \
 731                                 encode_putfh_maxsz + \
 732                                 encode_statfs_maxsz)
 733 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
 734                                 decode_sequence_maxsz + \
 735                                 decode_putfh_maxsz + \
 736                                 decode_statfs_maxsz)
 737 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
 738                                 encode_sequence_maxsz + \
 739                                 encode_putfh_maxsz + \
 740                                 encode_getattr_maxsz)
 741 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
 742                                 decode_sequence_maxsz + \
 743                                 decode_putfh_maxsz + \
 744                                 decode_getattr_maxsz)
 745 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
 746                                 encode_sequence_maxsz + \
 747                                 encode_putfh_maxsz + \
 748                                 encode_layoutreturn_maxsz + \
 749                                 encode_delegreturn_maxsz + \
 750                                 encode_getattr_maxsz)
 751 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
 752                                 decode_sequence_maxsz + \
 753                                 decode_putfh_maxsz + \
 754                                 decode_layoutreturn_maxsz + \
 755                                 decode_delegreturn_maxsz + \
 756                                 decode_getattr_maxsz)
 757 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
 758                                 encode_sequence_maxsz + \
 759                                 encode_putfh_maxsz + \
 760                                 encode_getacl_maxsz)
 761 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
 762                                 decode_sequence_maxsz + \
 763                                 decode_putfh_maxsz + \
 764                                 decode_getacl_maxsz)
 765 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
 766                                 encode_sequence_maxsz + \
 767                                 encode_putfh_maxsz + \
 768                                 encode_setacl_maxsz)
 769 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
 770                                 decode_sequence_maxsz + \
 771                                 decode_putfh_maxsz + \
 772                                 decode_setacl_maxsz)
 773 #define NFS4_enc_fs_locations_sz \
 774                                 (compound_encode_hdr_maxsz + \
 775                                  encode_sequence_maxsz + \
 776                                  encode_putfh_maxsz + \
 777                                  encode_lookup_maxsz + \
 778                                  encode_fs_locations_maxsz + \
 779                                  encode_renew_maxsz)
 780 #define NFS4_dec_fs_locations_sz \
 781                                 (compound_decode_hdr_maxsz + \
 782                                  decode_sequence_maxsz + \
 783                                  decode_putfh_maxsz + \
 784                                  decode_lookup_maxsz + \
 785                                  decode_fs_locations_maxsz + \
 786                                  decode_renew_maxsz)
 787 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
 788                                 encode_sequence_maxsz + \
 789                                 encode_putfh_maxsz + \
 790                                 encode_secinfo_maxsz)
 791 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
 792                                 decode_sequence_maxsz + \
 793                                 decode_putfh_maxsz + \
 794                                 decode_secinfo_maxsz)
 795 #define NFS4_enc_fsid_present_sz \
 796                                 (compound_encode_hdr_maxsz + \
 797                                  encode_sequence_maxsz + \
 798                                  encode_putfh_maxsz + \
 799                                  encode_getfh_maxsz + \
 800                                  encode_renew_maxsz)
 801 #define NFS4_dec_fsid_present_sz \
 802                                 (compound_decode_hdr_maxsz + \
 803                                  decode_sequence_maxsz + \
 804                                  decode_putfh_maxsz + \
 805                                  decode_getfh_maxsz + \
 806                                  decode_renew_maxsz)
 807 #if defined(CONFIG_NFS_V4_1)
 808 #define NFS4_enc_bind_conn_to_session_sz \
 809                                 (compound_encode_hdr_maxsz + \
 810                                  encode_bind_conn_to_session_maxsz)
 811 #define NFS4_dec_bind_conn_to_session_sz \
 812                                 (compound_decode_hdr_maxsz + \
 813                                  decode_bind_conn_to_session_maxsz)
 814 #define NFS4_enc_exchange_id_sz \
 815                                 (compound_encode_hdr_maxsz + \
 816                                  encode_exchange_id_maxsz)
 817 #define NFS4_dec_exchange_id_sz \
 818                                 (compound_decode_hdr_maxsz + \
 819                                  decode_exchange_id_maxsz)
 820 #define NFS4_enc_create_session_sz \
 821                                 (compound_encode_hdr_maxsz + \
 822                                  encode_create_session_maxsz)
 823 #define NFS4_dec_create_session_sz \
 824                                 (compound_decode_hdr_maxsz + \
 825                                  decode_create_session_maxsz)
 826 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
 827                                          encode_destroy_session_maxsz)
 828 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
 829                                          decode_destroy_session_maxsz)
 830 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
 831                                          encode_destroy_clientid_maxsz)
 832 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
 833                                          decode_destroy_clientid_maxsz)
 834 #define NFS4_enc_sequence_sz \
 835                                 (compound_decode_hdr_maxsz + \
 836                                  encode_sequence_maxsz)
 837 #define NFS4_dec_sequence_sz \
 838                                 (compound_decode_hdr_maxsz + \
 839                                  decode_sequence_maxsz)
 840 #endif
 841 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
 842                                          encode_sequence_maxsz + \
 843                                          encode_putrootfh_maxsz + \
 844                                          encode_fsinfo_maxsz)
 845 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
 846                                          decode_sequence_maxsz + \
 847                                          decode_putrootfh_maxsz + \
 848                                          decode_fsinfo_maxsz)
 849 #if defined(CONFIG_NFS_V4_1)
 850 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
 851                                          encode_sequence_maxsz + \
 852                                          encode_reclaim_complete_maxsz)
 853 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
 854                                          decode_sequence_maxsz + \
 855                                          decode_reclaim_complete_maxsz)
 856 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
 857                                 encode_sequence_maxsz +\
 858                                 encode_getdeviceinfo_maxsz)
 859 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
 860                                 decode_sequence_maxsz + \
 861                                 decode_getdeviceinfo_maxsz)
 862 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
 863                                 encode_sequence_maxsz + \
 864                                 encode_putfh_maxsz +        \
 865                                 encode_layoutget_maxsz)
 866 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
 867                                 decode_sequence_maxsz + \
 868                                 decode_putfh_maxsz +        \
 869                                 decode_layoutget_maxsz)
 870 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
 871                                 encode_sequence_maxsz +\
 872                                 encode_putfh_maxsz + \
 873                                 encode_layoutcommit_maxsz + \
 874                                 encode_getattr_maxsz)
 875 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
 876                                 decode_sequence_maxsz + \
 877                                 decode_putfh_maxsz + \
 878                                 decode_layoutcommit_maxsz + \
 879                                 decode_getattr_maxsz)
 880 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
 881                                 encode_sequence_maxsz + \
 882                                 encode_putfh_maxsz + \
 883                                 encode_layoutreturn_maxsz)
 884 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
 885                                 decode_sequence_maxsz + \
 886                                 decode_putfh_maxsz + \
 887                                 decode_layoutreturn_maxsz)
 888 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
 889                                         encode_sequence_maxsz + \
 890                                         encode_putrootfh_maxsz +\
 891                                         encode_secinfo_no_name_maxsz)
 892 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
 893                                         decode_sequence_maxsz + \
 894                                         decode_putrootfh_maxsz + \
 895                                         decode_secinfo_no_name_maxsz)
 896 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
 897                                          encode_sequence_maxsz + \
 898                                          encode_test_stateid_maxsz)
 899 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
 900                                          decode_sequence_maxsz + \
 901                                          decode_test_stateid_maxsz)
 902 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
 903                                          encode_sequence_maxsz + \
 904                                          encode_free_stateid_maxsz)
 905 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
 906                                          decode_sequence_maxsz + \
 907                                          decode_free_stateid_maxsz)
 908 
 909 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 910                                       compound_encode_hdr_maxsz +
 911                                       encode_sequence_maxsz +
 912                                       encode_putfh_maxsz +
 913                                       encode_getattr_maxsz) *
 914                                      XDR_UNIT);
 915 
 916 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
 917                                      compound_decode_hdr_maxsz +
 918                                      decode_sequence_maxsz +
 919                                      decode_putfh_maxsz) *
 920                                     XDR_UNIT);
 921 
 922 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
 923                                            compound_decode_hdr_maxsz +
 924                                            decode_sequence_maxsz) *
 925                                           XDR_UNIT);
 926 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
 927 #endif /* CONFIG_NFS_V4_1 */
 928 
 929 static const umode_t nfs_type2fmt[] = {
 930         [NF4BAD] = 0,
 931         [NF4REG] = S_IFREG,
 932         [NF4DIR] = S_IFDIR,
 933         [NF4BLK] = S_IFBLK,
 934         [NF4CHR] = S_IFCHR,
 935         [NF4LNK] = S_IFLNK,
 936         [NF4SOCK] = S_IFSOCK,
 937         [NF4FIFO] = S_IFIFO,
 938         [NF4ATTRDIR] = 0,
 939         [NF4NAMEDATTR] = 0,
 940 };
 941 
 942 struct compound_hdr {
 943         int32_t         status;
 944         uint32_t        nops;
 945         __be32 *        nops_p;
 946         uint32_t        taglen;
 947         char *          tag;
 948         uint32_t        replen;         /* expected reply words */
 949         u32             minorversion;
 950 };
 951 
 952 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
 953 {
 954         __be32 *p = xdr_reserve_space(xdr, nbytes);
 955         BUG_ON(!p);
 956         return p;
 957 }
 958 
 959 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
 960 {
 961         WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
 962 }
 963 
 964 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
 965 {
 966         WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
 967 }
 968 
 969 static void encode_uint32(struct xdr_stream *xdr, u32 n)
 970 {
 971         WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
 972 }
 973 
 974 static void encode_uint64(struct xdr_stream *xdr, u64 n)
 975 {
 976         WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
 977 }
 978 
 979 static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
 980                 const __u32 *bitmap, size_t len)
 981 {
 982         ssize_t ret;
 983 
 984         /* Trim empty words */
 985         while (len > 0 && bitmap[len-1] == 0)
 986                 len--;
 987         ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
 988         if (WARN_ON_ONCE(ret < 0))
 989                 return ret;
 990         return len;
 991 }
 992 
 993 static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
 994                 __u32 *res, size_t len)
 995 {
 996         size_t i;
 997         __u32 tmp;
 998 
 999         while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
1000                 len--;
1001         for (i = len; i-- > 0;) {
1002                 tmp = bitmap[i] & mask[i];
1003                 res[i] = tmp;
1004         }
1005         return len;
1006 }
1007 
1008 static void encode_nfs4_seqid(struct xdr_stream *xdr,
1009                 const struct nfs_seqid *seqid)
1010 {
1011         if (seqid != NULL)
1012                 encode_uint32(xdr, seqid->sequence->counter);
1013         else
1014                 encode_uint32(xdr, 0);
1015 }
1016 
1017 static void encode_compound_hdr(struct xdr_stream *xdr,
1018                                 struct rpc_rqst *req,
1019                                 struct compound_hdr *hdr)
1020 {
1021         __be32 *p;
1022 
1023         /* initialize running count of expected bytes in reply.
1024          * NOTE: the replied tag SHOULD be the same is the one sent,
1025          * but this is not required as a MUST for the server to do so. */
1026         hdr->replen = 3 + hdr->taglen;
1027 
1028         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
1029         encode_string(xdr, hdr->taglen, hdr->tag);
1030         p = reserve_space(xdr, 8);
1031         *p++ = cpu_to_be32(hdr->minorversion);
1032         hdr->nops_p = p;
1033         *p = cpu_to_be32(hdr->nops);
1034 }
1035 
1036 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
1037                 uint32_t replen,
1038                 struct compound_hdr *hdr)
1039 {
1040         encode_uint32(xdr, op);
1041         hdr->nops++;
1042         hdr->replen += replen;
1043 }
1044 
1045 static void encode_nops(struct compound_hdr *hdr)
1046 {
1047         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
1048         *hdr->nops_p = htonl(hdr->nops);
1049 }
1050 
1051 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1052 {
1053         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
1054 }
1055 
1056 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
1057 {
1058         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1059 }
1060 
1061 static __be32 *
1062 xdr_encode_nfstime4(__be32 *p, const struct timespec *t)
1063 {
1064         p = xdr_encode_hyper(p, (__s64)t->tv_sec);
1065         *p++ = cpu_to_be32(t->tv_nsec);
1066         return p;
1067 }
1068 
1069 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1070                                 const struct nfs4_label *label,
1071                                 const umode_t *umask,
1072                                 const struct nfs_server *server,
1073                                 const uint32_t attrmask[])
1074 {
1075         struct timespec ts;
1076         char owner_name[IDMAP_NAMESZ];
1077         char owner_group[IDMAP_NAMESZ];
1078         int owner_namelen = 0;
1079         int owner_grouplen = 0;
1080         __be32 *p;
1081         uint32_t len = 0;
1082         uint32_t bmval[3] = { 0 };
1083 
1084         /*
1085          * We reserve enough space to write the entire attribute buffer at once.
1086          */
1087         if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) {
1088                 bmval[0] |= FATTR4_WORD0_SIZE;
1089                 len += 8;
1090         }
1091         if (iap->ia_valid & ATTR_MODE) {
1092                 if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) {
1093                         bmval[2] |= FATTR4_WORD2_MODE_UMASK;
1094                         len += 8;
1095                 } else if (attrmask[1] & FATTR4_WORD1_MODE) {
1096                         bmval[1] |= FATTR4_WORD1_MODE;
1097                         len += 4;
1098                 }
1099         }
1100         if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) {
1101                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1102                 if (owner_namelen < 0) {
1103                         dprintk("nfs: couldn't resolve uid %d to string\n",
1104                                         from_kuid(&init_user_ns, iap->ia_uid));
1105                         /* XXX */
1106                         strcpy(owner_name, "nobody");
1107                         owner_namelen = sizeof("nobody") - 1;
1108                         /* goto out; */
1109                 }
1110                 bmval[1] |= FATTR4_WORD1_OWNER;
1111                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1112         }
1113         if ((iap->ia_valid & ATTR_GID) &&
1114            (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) {
1115                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1116                 if (owner_grouplen < 0) {
1117                         dprintk("nfs: couldn't resolve gid %d to string\n",
1118                                         from_kgid(&init_user_ns, iap->ia_gid));
1119                         strcpy(owner_group, "nobody");
1120                         owner_grouplen = sizeof("nobody") - 1;
1121                         /* goto out; */
1122                 }
1123                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1124                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1125         }
1126         if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1127                 if (iap->ia_valid & ATTR_ATIME_SET) {
1128                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1129                         len += 4 + (nfstime4_maxsz << 2);
1130                 } else if (iap->ia_valid & ATTR_ATIME) {
1131                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1132                         len += 4;
1133                 }
1134         }
1135         if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1136                 if (iap->ia_valid & ATTR_MTIME_SET) {
1137                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1138                         len += 4 + (nfstime4_maxsz << 2);
1139                 } else if (iap->ia_valid & ATTR_MTIME) {
1140                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1141                         len += 4;
1142                 }
1143         }
1144 
1145         if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1146                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1147                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1148         }
1149 
1150         xdr_encode_bitmap4(xdr, bmval, ARRAY_SIZE(bmval));
1151         xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);
1152 
1153         if (bmval[0] & FATTR4_WORD0_SIZE)
1154                 p = xdr_encode_hyper(p, iap->ia_size);
1155         if (bmval[1] & FATTR4_WORD1_MODE)
1156                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1157         if (bmval[1] & FATTR4_WORD1_OWNER)
1158                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1159         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1160                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1161         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1162                 if (iap->ia_valid & ATTR_ATIME_SET) {
1163                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1164                         ts = timespec64_to_timespec(iap->ia_atime);
1165                         p = xdr_encode_nfstime4(p, &ts);
1166                 } else
1167                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1168         }
1169         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1170                 if (iap->ia_valid & ATTR_MTIME_SET) {
1171                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1172                         ts = timespec64_to_timespec(iap->ia_mtime);
1173                         p = xdr_encode_nfstime4(p, &ts);
1174                 } else
1175                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1176         }
1177         if (label && (bmval[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1178                 *p++ = cpu_to_be32(label->lfs);
1179                 *p++ = cpu_to_be32(label->pi);
1180                 *p++ = cpu_to_be32(label->len);
1181                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1182         }
1183         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
1184                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1185                 *p++ = cpu_to_be32(*umask);
1186         }
1187 
1188 /* out: */
1189 }
1190 
1191 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1192 {
1193         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1194         encode_uint32(xdr, access);
1195 }
1196 
1197 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1198 {
1199         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1200         encode_nfs4_seqid(xdr, arg->seqid);
1201         encode_nfs4_stateid(xdr, &arg->stateid);
1202 }
1203 
1204 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1205 {
1206         __be32 *p;
1207 
1208         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1209         p = reserve_space(xdr, 12);
1210         p = xdr_encode_hyper(p, args->offset);
1211         *p = cpu_to_be32(args->count);
1212 }
1213 
1214 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1215 {
1216         __be32 *p;
1217 
1218         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1219         encode_uint32(xdr, create->ftype);
1220 
1221         switch (create->ftype) {
1222         case NF4LNK:
1223                 p = reserve_space(xdr, 4);
1224                 *p = cpu_to_be32(create->u.symlink.len);
1225                 xdr_write_pages(xdr, create->u.symlink.pages, 0,
1226                                 create->u.symlink.len);
1227                 xdr->buf->flags |= XDRBUF_WRITE;
1228                 break;
1229 
1230         case NF4BLK: case NF4CHR:
1231                 p = reserve_space(xdr, 8);
1232                 *p++ = cpu_to_be32(create->u.device.specdata1);
1233                 *p = cpu_to_be32(create->u.device.specdata2);
1234                 break;
1235 
1236         default:
1237                 break;
1238         }
1239 
1240         encode_string(xdr, create->name->len, create->name->name);
1241         encode_attrs(xdr, create->attrs, create->label, &create->umask,
1242                         create->server, create->server->attr_bitmask);
1243 }
1244 
1245 static void encode_getattr(struct xdr_stream *xdr,
1246                 const __u32 *bitmap, const __u32 *mask, size_t len,
1247                 struct compound_hdr *hdr)
1248 {
1249         __u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];
1250 
1251         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1252         if (mask) {
1253                 if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
1254                         len = ARRAY_SIZE(masked_bitmap);
1255                 len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
1256                 bitmap = masked_bitmap;
1257         }
1258         xdr_encode_bitmap4(xdr, bitmap, len);
1259 }
1260 
1261 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1262 {
1263         encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
1264                         ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
1265 }
1266 
1267 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1268                                  const u32 *open_bitmap,
1269                                  struct compound_hdr *hdr)
1270 {
1271         encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
1272 }
1273 
1274 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1275 {
1276         encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
1277                         ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
1278 }
1279 
1280 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1281 {
1282         encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
1283                         ARRAY_SIZE(nfs4_fs_locations_bitmap), hdr);
1284 }
1285 
1286 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1287 {
1288         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1289 }
1290 
1291 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1292 {
1293         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1294         encode_string(xdr, name->len, name->name);
1295 }
1296 
1297 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1298 {
1299         if (fl->fl_type == F_RDLCK)
1300                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1301         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1302 }
1303 
1304 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1305 {
1306         if (fl->fl_end == OFFSET_MAX)
1307                 return ~(uint64_t)0;
1308         return fl->fl_end - fl->fl_start + 1;
1309 }
1310 
1311 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1312 {
1313         __be32 *p;
1314 
1315         p = reserve_space(xdr, 32);
1316         p = xdr_encode_hyper(p, lowner->clientid);
1317         *p++ = cpu_to_be32(20);
1318         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1319         *p++ = cpu_to_be32(lowner->s_dev);
1320         xdr_encode_hyper(p, lowner->id);
1321 }
1322 
1323 /*
1324  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1325  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1326  */
1327 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1328 {
1329         __be32 *p;
1330 
1331         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1332         p = reserve_space(xdr, 28);
1333         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1334         *p++ = cpu_to_be32(args->reclaim);
1335         p = xdr_encode_hyper(p, args->fl->fl_start);
1336         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1337         *p = cpu_to_be32(args->new_lock_owner);
1338         if (args->new_lock_owner){
1339                 encode_nfs4_seqid(xdr, args->open_seqid);
1340                 encode_nfs4_stateid(xdr, &args->open_stateid);
1341                 encode_nfs4_seqid(xdr, args->lock_seqid);
1342                 encode_lockowner(xdr, &args->lock_owner);
1343         }
1344         else {
1345                 encode_nfs4_stateid(xdr, &args->lock_stateid);
1346                 encode_nfs4_seqid(xdr, args->lock_seqid);
1347         }
1348 }
1349 
1350 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1351 {
1352         __be32 *p;
1353 
1354         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1355         p = reserve_space(xdr, 20);
1356         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1357         p = xdr_encode_hyper(p, args->fl->fl_start);
1358         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1359         encode_lockowner(xdr, &args->lock_owner);
1360 }
1361 
1362 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1363 {
1364         __be32 *p;
1365 
1366         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1367         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1368         encode_nfs4_seqid(xdr, args->seqid);
1369         encode_nfs4_stateid(xdr, &args->stateid);
1370         p = reserve_space(xdr, 16);
1371         p = xdr_encode_hyper(p, args->fl->fl_start);
1372         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1373 }
1374 
1375 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1376 {
1377         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1378         encode_lockowner(xdr, lowner);
1379 }
1380 
1381 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1382 {
1383         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1384         encode_string(xdr, name->len, name->name);
1385 }
1386 
1387 static void encode_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
1388 {
1389         encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
1390 }
1391 
1392 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1393 {
1394         __be32 *p;
1395 
1396         p = reserve_space(xdr, 8);
1397         *p++ = cpu_to_be32(share_access);
1398         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1399 }
1400 
1401 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1402 {
1403         __be32 *p;
1404  /*
1405  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1406  * owner 4 = 32
1407  */
1408         encode_nfs4_seqid(xdr, arg->seqid);
1409         encode_share_access(xdr, arg->share_access);
1410         p = reserve_space(xdr, 36);
1411         p = xdr_encode_hyper(p, arg->clientid);
1412         *p++ = cpu_to_be32(24);
1413         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1414         *p++ = cpu_to_be32(arg->server->s_dev);
1415         *p++ = cpu_to_be32(arg->id.uniquifier);
1416         xdr_encode_hyper(p, arg->id.create_time);
1417 }
1418 
1419 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1420 {
1421         __be32 *p;
1422 
1423         p = reserve_space(xdr, 4);
1424         switch(arg->createmode) {
1425         case NFS4_CREATE_UNCHECKED:
1426                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1427                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1428                                 arg->server, arg->server->attr_bitmask);
1429                 break;
1430         case NFS4_CREATE_GUARDED:
1431                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1432                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1433                                 arg->server, arg->server->attr_bitmask);
1434                 break;
1435         case NFS4_CREATE_EXCLUSIVE:
1436                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1437                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1438                 break;
1439         case NFS4_CREATE_EXCLUSIVE4_1:
1440                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1441                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1442                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1443                                 arg->server, arg->server->exclcreat_bitmask);
1444         }
1445 }
1446 
1447 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1448 {
1449         __be32 *p;
1450 
1451         p = reserve_space(xdr, 4);
1452         switch (arg->open_flags & O_CREAT) {
1453         case 0:
1454                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1455                 break;
1456         default:
1457                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1458                 encode_createmode(xdr, arg);
1459         }
1460 }
1461 
1462 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1463 {
1464         __be32 *p;
1465 
1466         p = reserve_space(xdr, 4);
1467         switch (delegation_type) {
1468         case 0:
1469                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1470                 break;
1471         case FMODE_READ:
1472                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1473                 break;
1474         case FMODE_WRITE|FMODE_READ:
1475                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1476                 break;
1477         default:
1478                 BUG();
1479         }
1480 }
1481 
1482 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1483 {
1484         __be32 *p;
1485 
1486         p = reserve_space(xdr, 4);
1487         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1488         encode_string(xdr, name->len, name->name);
1489 }
1490 
1491 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1492 {
1493         __be32 *p;
1494 
1495         p = reserve_space(xdr, 4);
1496         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1497         encode_delegation_type(xdr, type);
1498 }
1499 
1500 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1501 {
1502         __be32 *p;
1503 
1504         p = reserve_space(xdr, 4);
1505         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1506         encode_nfs4_stateid(xdr, stateid);
1507         encode_string(xdr, name->len, name->name);
1508 }
1509 
1510 static inline void encode_claim_fh(struct xdr_stream *xdr)
1511 {
1512         __be32 *p;
1513 
1514         p = reserve_space(xdr, 4);
1515         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1516 }
1517 
1518 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1519 {
1520         __be32 *p;
1521 
1522         p = reserve_space(xdr, 4);
1523         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1524         encode_nfs4_stateid(xdr, stateid);
1525 }
1526 
1527 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1528 {
1529         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1530         encode_openhdr(xdr, arg);
1531         encode_opentype(xdr, arg);
1532         switch (arg->claim) {
1533         case NFS4_OPEN_CLAIM_NULL:
1534                 encode_claim_null(xdr, arg->name);
1535                 break;
1536         case NFS4_OPEN_CLAIM_PREVIOUS:
1537                 encode_claim_previous(xdr, arg->u.delegation_type);
1538                 break;
1539         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1540                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1541                 break;
1542         case NFS4_OPEN_CLAIM_FH:
1543                 encode_claim_fh(xdr);
1544                 break;
1545         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1546                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1547                 break;
1548         default:
1549                 BUG();
1550         }
1551 }
1552 
1553 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1554 {
1555         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1556         encode_nfs4_stateid(xdr, arg->stateid);
1557         encode_nfs4_seqid(xdr, arg->seqid);
1558 }
1559 
1560 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1561 {
1562         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1563         encode_nfs4_stateid(xdr, &arg->stateid);
1564         encode_nfs4_seqid(xdr, arg->seqid);
1565         encode_share_access(xdr, arg->share_access);
1566 }
1567 
1568 static void
1569 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1570 {
1571         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1572         encode_string(xdr, fh->size, fh->data);
1573 }
1574 
1575 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1576 {
1577         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1578 }
1579 
1580 static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1581                         struct compound_hdr *hdr)
1582 {
1583         __be32 *p;
1584 
1585         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1586         encode_nfs4_stateid(xdr, &args->stateid);
1587 
1588         p = reserve_space(xdr, 12);
1589         p = xdr_encode_hyper(p, args->offset);
1590         *p = cpu_to_be32(args->count);
1591 }
1592 
1593 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1594 {
1595         uint32_t attrs[3] = {
1596                 FATTR4_WORD0_RDATTR_ERROR,
1597                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1598         };
1599         uint32_t dircount = readdir->count >> 1;
1600         __be32 *p, verf[2];
1601         uint32_t attrlen = 0;
1602         unsigned int i;
1603 
1604         if (readdir->plus) {
1605                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1606                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1607                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1608                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1609                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1610                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1611                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1612                 dircount >>= 1;
1613         }
1614         /* Use mounted_on_fileid only if the server supports it */
1615         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1616                 attrs[0] |= FATTR4_WORD0_FILEID;
1617         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1618                 attrs[i] &= readdir->bitmask[i];
1619                 if (attrs[i] != 0)
1620                         attrlen = i+1;
1621         }
1622 
1623         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1624         encode_uint64(xdr, readdir->cookie);
1625         encode_nfs4_verifier(xdr, &readdir->verifier);
1626         p = reserve_space(xdr, 12 + (attrlen << 2));
1627         *p++ = cpu_to_be32(dircount);
1628         *p++ = cpu_to_be32(readdir->count);
1629         *p++ = cpu_to_be32(attrlen);
1630         for (i = 0; i < attrlen; i++)
1631                 *p++ = cpu_to_be32(attrs[i]);
1632         memcpy(verf, readdir->verifier.data, sizeof(verf));
1633 
1634         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1635                         __func__,
1636                         (unsigned long long)readdir->cookie,
1637                         verf[0], verf[1],
1638                         attrs[0] & readdir->bitmask[0],
1639                         attrs[1] & readdir->bitmask[1],
1640                         attrs[2] & readdir->bitmask[2]);
1641 }
1642 
1643 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1644 {
1645         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1646 }
1647 
1648 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1649 {
1650         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1651         encode_string(xdr, name->len, name->name);
1652 }
1653 
1654 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1655 {
1656         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1657         encode_string(xdr, oldname->len, oldname->name);
1658         encode_string(xdr, newname->len, newname->name);
1659 }
1660 
1661 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1662                          struct compound_hdr *hdr)
1663 {
1664         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1665         encode_uint64(xdr, clid);
1666 }
1667 
1668 static void
1669 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1670 {
1671         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1672 }
1673 
1674 static void
1675 encode_setacl(struct xdr_stream *xdr, const struct nfs_setaclargs *arg,
1676                 struct compound_hdr *hdr)
1677 {
1678         __be32 *p;
1679 
1680         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1681         encode_nfs4_stateid(xdr, &zero_stateid);
1682         p = reserve_space(xdr, 2*4);
1683         *p++ = cpu_to_be32(1);
1684         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1685         p = reserve_space(xdr, 4);
1686         *p = cpu_to_be32(arg->acl_len);
1687         xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
1688 }
1689 
1690 static void
1691 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1692 {
1693         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1694 }
1695 
1696 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1697 {
1698         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1699         encode_nfs4_stateid(xdr, &arg->stateid);
1700         encode_attrs(xdr, arg->iap, arg->label, NULL, server,
1701                         server->attr_bitmask);
1702 }
1703 
1704 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1705 {
1706         __be32 *p;
1707 
1708         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1709         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1710 
1711         encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1712                         setclientid->sc_clnt->cl_owner_id);
1713         p = reserve_space(xdr, 4);
1714         *p = cpu_to_be32(setclientid->sc_prog);
1715         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1716         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1717         p = reserve_space(xdr, 4);
1718         *p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1719 }
1720 
1721 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1722 {
1723         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1724                         decode_setclientid_confirm_maxsz, hdr);
1725         encode_uint64(xdr, arg->clientid);
1726         encode_nfs4_verifier(xdr, &arg->confirm);
1727 }
1728 
1729 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1730                          struct compound_hdr *hdr)
1731 {
1732         __be32 *p;
1733 
1734         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1735         encode_nfs4_stateid(xdr, &args->stateid);
1736 
1737         p = reserve_space(xdr, 16);
1738         p = xdr_encode_hyper(p, args->offset);
1739         *p++ = cpu_to_be32(args->stable);
1740         *p = cpu_to_be32(args->count);
1741 
1742         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1743 }
1744 
1745 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1746 {
1747         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1748         encode_nfs4_stateid(xdr, stateid);
1749 }
1750 
1751 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1752 {
1753         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1754         encode_string(xdr, name->len, name->name);
1755 }
1756 
1757 #if defined(CONFIG_NFS_V4_1)
1758 /* NFSv4.1 operations */
1759 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1760                                    const struct nfs41_bind_conn_to_session_args *args,
1761                                    struct compound_hdr *hdr)
1762 {
1763         __be32 *p;
1764 
1765         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1766                 decode_bind_conn_to_session_maxsz, hdr);
1767         encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1768         p = xdr_reserve_space(xdr, 8);
1769         *p++ = cpu_to_be32(args->dir);
1770         *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1771 }
1772 
1773 static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
1774 {
1775         unsigned int i;
1776         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1777         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1778                 encode_uint32(xdr, op_map->u.words[i]);
1779 }
1780 
1781 static void encode_exchange_id(struct xdr_stream *xdr,
1782                                const struct nfs41_exchange_id_args *args,
1783                                struct compound_hdr *hdr)
1784 {
1785         __be32 *p;
1786         char impl_name[IMPL_NAME_LIMIT];
1787         int len = 0;
1788 
1789         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1790         encode_nfs4_verifier(xdr, &args->verifier);
1791 
1792         encode_string(xdr, strlen(args->client->cl_owner_id),
1793                         args->client->cl_owner_id);
1794 
1795         encode_uint32(xdr, args->flags);
1796         encode_uint32(xdr, args->state_protect.how);
1797 
1798         switch (args->state_protect.how) {
1799         case SP4_NONE:
1800                 break;
1801         case SP4_MACH_CRED:
1802                 encode_op_map(xdr, &args->state_protect.enforce);
1803                 encode_op_map(xdr, &args->state_protect.allow);
1804                 break;
1805         default:
1806                 WARN_ON_ONCE(1);
1807                 break;
1808         }
1809 
1810         if (send_implementation_id &&
1811             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1812             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1813                 <= sizeof(impl_name) + 1)
1814                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1815                                utsname()->sysname, utsname()->release,
1816                                utsname()->version, utsname()->machine);
1817 
1818         if (len > 0) {
1819                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1820 
1821                 encode_string(xdr,
1822                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1823                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1824                 encode_string(xdr, len, impl_name);
1825                 /* just send zeros for nii_date - the date is in nii_name */
1826                 p = reserve_space(xdr, 12);
1827                 p = xdr_encode_hyper(p, 0);
1828                 *p = cpu_to_be32(0);
1829         } else
1830                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1831 }
1832 
1833 static void encode_create_session(struct xdr_stream *xdr,
1834                                   const struct nfs41_create_session_args *args,
1835                                   struct compound_hdr *hdr)
1836 {
1837         __be32 *p;
1838         struct nfs_client *clp = args->client;
1839         struct rpc_clnt *clnt = clp->cl_rpcclient;
1840         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1841         u32 max_resp_sz_cached;
1842 
1843         /*
1844          * Assumes OPEN is the biggest non-idempotent compound.
1845          * 2 is the verifier.
1846          */
1847         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
1848                                 * XDR_UNIT + RPC_MAX_AUTH_SIZE;
1849 
1850         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1851         p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1852         p = xdr_encode_hyper(p, args->clientid);
1853         *p++ = cpu_to_be32(args->seqid);                        /*Sequence id */
1854         *p++ = cpu_to_be32(args->flags);                        /*flags */
1855 
1856         /* Fore Channel */
1857         *p++ = cpu_to_be32(0);                          /* header padding size */
1858         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1859         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1860         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1861         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1862         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1863         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1864 
1865         /* Back Channel */
1866         *p++ = cpu_to_be32(0);                          /* header padding size */
1867         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1868         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1869         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1870         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1871         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1872         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1873 
1874         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1875         *p++ = cpu_to_be32(1);
1876         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1877 
1878         /* authsys_parms rfc1831 */
1879         *p++ = cpu_to_be32(ktime_to_ns(nn->boot_time)); /* stamp */
1880         p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1881         *p++ = cpu_to_be32(0);                          /* UID */
1882         *p++ = cpu_to_be32(0);                          /* GID */
1883         *p = cpu_to_be32(0);                            /* No more gids */
1884 }
1885 
1886 static void encode_destroy_session(struct xdr_stream *xdr,
1887                                    const struct nfs4_session *session,
1888                                    struct compound_hdr *hdr)
1889 {
1890         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1891         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1892 }
1893 
1894 static void encode_destroy_clientid(struct xdr_stream *xdr,
1895                                    uint64_t clientid,
1896                                    struct compound_hdr *hdr)
1897 {
1898         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1899         encode_uint64(xdr, clientid);
1900 }
1901 
1902 static void encode_reclaim_complete(struct xdr_stream *xdr,
1903                                     const struct nfs41_reclaim_complete_args *args,
1904                                     struct compound_hdr *hdr)
1905 {
1906         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1907         encode_uint32(xdr, args->one_fs);
1908 }
1909 #endif /* CONFIG_NFS_V4_1 */
1910 
1911 static void encode_sequence(struct xdr_stream *xdr,
1912                             const struct nfs4_sequence_args *args,
1913                             struct compound_hdr *hdr)
1914 {
1915 #if defined(CONFIG_NFS_V4_1)
1916         struct nfs4_session *session;
1917         struct nfs4_slot_table *tp;
1918         struct nfs4_slot *slot = args->sa_slot;
1919         __be32 *p;
1920 
1921         tp = slot->table;
1922         session = tp->session;
1923         if (!session)
1924                 return;
1925 
1926         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1927 
1928         /*
1929          * Sessionid + seqid + slotid + max slotid + cache_this
1930          */
1931         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1932                 "max_slotid=%d cache_this=%d\n",
1933                 __func__,
1934                 ((u32 *)session->sess_id.data)[0],
1935                 ((u32 *)session->sess_id.data)[1],
1936                 ((u32 *)session->sess_id.data)[2],
1937                 ((u32 *)session->sess_id.data)[3],
1938                 slot->seq_nr, slot->slot_nr,
1939                 tp->highest_used_slotid, args->sa_cache_this);
1940         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1941         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1942         *p++ = cpu_to_be32(slot->seq_nr);
1943         *p++ = cpu_to_be32(slot->slot_nr);
1944         *p++ = cpu_to_be32(tp->highest_used_slotid);
1945         *p = cpu_to_be32(args->sa_cache_this);
1946 #endif /* CONFIG_NFS_V4_1 */
1947 }
1948 
1949 #ifdef CONFIG_NFS_V4_1
1950 static void
1951 encode_getdeviceinfo(struct xdr_stream *xdr,
1952                      const struct nfs4_getdeviceinfo_args *args,
1953                      struct compound_hdr *hdr)
1954 {
1955         __be32 *p;
1956 
1957         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1958         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1959         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1960                                     NFS4_DEVICEID4_SIZE);
1961         *p++ = cpu_to_be32(args->pdev->layout_type);
1962         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1963 
1964         p = reserve_space(xdr, 4 + 4);
1965         *p++ = cpu_to_be32(1);                  /* bitmap length */
1966         *p++ = cpu_to_be32(args->notify_types);
1967 }
1968 
1969 static void
1970 encode_layoutget(struct xdr_stream *xdr,
1971                       const struct nfs4_layoutget_args *args,
1972                       struct compound_hdr *hdr)
1973 {
1974         __be32 *p;
1975 
1976         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1977         p = reserve_space(xdr, 36);
1978         *p++ = cpu_to_be32(0);     /* Signal layout available */
1979         *p++ = cpu_to_be32(args->type);
1980         *p++ = cpu_to_be32(args->range.iomode);
1981         p = xdr_encode_hyper(p, args->range.offset);
1982         p = xdr_encode_hyper(p, args->range.length);
1983         p = xdr_encode_hyper(p, args->minlength);
1984         encode_nfs4_stateid(xdr, &args->stateid);
1985         encode_uint32(xdr, args->maxcount);
1986 
1987         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1988                 __func__,
1989                 args->type,
1990                 args->range.iomode,
1991                 (unsigned long)args->range.offset,
1992                 (unsigned long)args->range.length,
1993                 args->maxcount);
1994 }
1995 
1996 static int
1997 encode_layoutcommit(struct xdr_stream *xdr,
1998                     struct inode *inode,
1999                     const struct nfs4_layoutcommit_args *args,
2000                     struct compound_hdr *hdr)
2001 {
2002         __be32 *p;
2003 
2004         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
2005                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
2006 
2007         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2008         p = reserve_space(xdr, 20);
2009         /* Only whole file layouts */
2010         p = xdr_encode_hyper(p, 0); /* offset */
2011         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
2012         *p = cpu_to_be32(0); /* reclaim */
2013         encode_nfs4_stateid(xdr, &args->stateid);
2014         if (args->lastbytewritten != U64_MAX) {
2015                 p = reserve_space(xdr, 20);
2016                 *p++ = cpu_to_be32(1); /* newoffset = TRUE */
2017                 p = xdr_encode_hyper(p, args->lastbytewritten);
2018         } else {
2019                 p = reserve_space(xdr, 12);
2020                 *p++ = cpu_to_be32(0); /* newoffset = FALSE */
2021         }
2022         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2023         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2024 
2025         encode_uint32(xdr, args->layoutupdate_len);
2026         if (args->layoutupdate_pages)
2027                 xdr_write_pages(xdr, args->layoutupdate_pages, 0,
2028                                 args->layoutupdate_len);
2029 
2030         return 0;
2031 }
2032 
2033 static void
2034 encode_layoutreturn(struct xdr_stream *xdr,
2035                     const struct nfs4_layoutreturn_args *args,
2036                     struct compound_hdr *hdr)
2037 {
2038         __be32 *p;
2039 
2040         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2041         p = reserve_space(xdr, 16);
2042         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2043         *p++ = cpu_to_be32(args->layout_type);
2044         *p++ = cpu_to_be32(args->range.iomode);
2045         *p = cpu_to_be32(RETURN_FILE);
2046         p = reserve_space(xdr, 16);
2047         p = xdr_encode_hyper(p, args->range.offset);
2048         p = xdr_encode_hyper(p, args->range.length);
2049         spin_lock(&args->inode->i_lock);
2050         encode_nfs4_stateid(xdr, &args->stateid);
2051         spin_unlock(&args->inode->i_lock);
2052         if (args->ld_private->ops && args->ld_private->ops->encode)
2053                 args->ld_private->ops->encode(xdr, args, args->ld_private);
2054         else
2055                 encode_uint32(xdr, 0);
2056 }
2057 
2058 static int
2059 encode_secinfo_no_name(struct xdr_stream *xdr,
2060                        const struct nfs41_secinfo_no_name_args *args,
2061                        struct compound_hdr *hdr)
2062 {
2063         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2064         encode_uint32(xdr, args->style);
2065         return 0;
2066 }
2067 
2068 static void encode_test_stateid(struct xdr_stream *xdr,
2069                                 const struct nfs41_test_stateid_args *args,
2070                                 struct compound_hdr *hdr)
2071 {
2072         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2073         encode_uint32(xdr, 1);
2074         encode_nfs4_stateid(xdr, args->stateid);
2075 }
2076 
2077 static void encode_free_stateid(struct xdr_stream *xdr,
2078                                 const struct nfs41_free_stateid_args *args,
2079                                 struct compound_hdr *hdr)
2080 {
2081         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2082         encode_nfs4_stateid(xdr, &args->stateid);
2083 }
2084 #else
2085 static inline void
2086 encode_layoutreturn(struct xdr_stream *xdr,
2087                     const struct nfs4_layoutreturn_args *args,
2088                     struct compound_hdr *hdr)
2089 {
2090 }
2091 
2092 static void
2093 encode_layoutget(struct xdr_stream *xdr,
2094                       const struct nfs4_layoutget_args *args,
2095                       struct compound_hdr *hdr)
2096 {
2097 }
2098 #endif /* CONFIG_NFS_V4_1 */
2099 
2100 /*
2101  * END OF "GENERIC" ENCODE ROUTINES.
2102  */
2103 
2104 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2105 {
2106 #if defined(CONFIG_NFS_V4_1)
2107         struct nfs4_session *session = args->sa_slot->table->session;
2108         if (session)
2109                 return session->clp->cl_mvops->minor_version;
2110 #endif /* CONFIG_NFS_V4_1 */
2111         return 0;
2112 }
2113 
2114 /*
2115  * Encode an ACCESS request
2116  */
2117 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2118                                 const void *data)
2119 {
2120         const struct nfs4_accessargs *args = data;
2121         struct compound_hdr hdr = {
2122                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2123         };
2124 
2125         encode_compound_hdr(xdr, req, &hdr);
2126         encode_sequence(xdr, &args->seq_args, &hdr);
2127         encode_putfh(xdr, args->fh, &hdr);
2128         encode_access(xdr, args->access, &hdr);
2129         if (args->bitmask)
2130                 encode_getfattr(xdr, args->bitmask, &hdr);
2131         encode_nops(&hdr);
2132 }
2133 
2134 /*
2135  * Encode LOOKUP request
2136  */
2137 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2138                                 const void *data)
2139 {
2140         const struct nfs4_lookup_arg *args = data;
2141         struct compound_hdr hdr = {
2142                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2143         };
2144 
2145         encode_compound_hdr(xdr, req, &hdr);
2146         encode_sequence(xdr, &args->seq_args, &hdr);
2147         encode_putfh(xdr, args->dir_fh, &hdr);
2148         encode_lookup(xdr, args->name, &hdr);
2149         encode_getfh(xdr, &hdr);
2150         encode_getfattr(xdr, args->bitmask, &hdr);
2151         encode_nops(&hdr);
2152 }
2153 
2154 /*
2155  * Encode LOOKUPP request
2156  */
2157 static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
2158                 const void *data)
2159 {
2160         const struct nfs4_lookupp_arg *args = data;
2161         struct compound_hdr hdr = {
2162                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2163         };
2164 
2165         encode_compound_hdr(xdr, req, &hdr);
2166         encode_sequence(xdr, &args->seq_args, &hdr);
2167         encode_putfh(xdr, args->fh, &hdr);
2168         encode_lookupp(xdr, &hdr);
2169         encode_getfh(xdr, &hdr);
2170         encode_getfattr(xdr, args->bitmask, &hdr);
2171         encode_nops(&hdr);
2172 }
2173 
2174 /*
2175  * Encode LOOKUP_ROOT request
2176  */
2177 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2178                                      struct xdr_stream *xdr,
2179                                      const void *data)
2180 {
2181         const struct nfs4_lookup_root_arg *args = data;
2182         struct compound_hdr hdr = {
2183                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2184         };
2185 
2186         encode_compound_hdr(xdr, req, &hdr);
2187         encode_sequence(xdr, &args->seq_args, &hdr);
2188         encode_putrootfh(xdr, &hdr);
2189         encode_getfh(xdr, &hdr);
2190         encode_getfattr(xdr, args->bitmask, &hdr);
2191         encode_nops(&hdr);
2192 }
2193 
2194 /*
2195  * Encode REMOVE request
2196  */
2197 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2198                                 const void *data)
2199 {
2200         const struct nfs_removeargs *args = data;
2201         struct compound_hdr hdr = {
2202                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2203         };
2204 
2205         encode_compound_hdr(xdr, req, &hdr);
2206         encode_sequence(xdr, &args->seq_args, &hdr);
2207         encode_putfh(xdr, args->fh, &hdr);
2208         encode_remove(xdr, &args->name, &hdr);
2209         encode_nops(&hdr);
2210 }
2211 
2212 /*
2213  * Encode RENAME request
2214  */
2215 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2216                                 const void *data)
2217 {
2218         const struct nfs_renameargs *args = data;
2219         struct compound_hdr hdr = {
2220                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2221         };
2222 
2223         encode_compound_hdr(xdr, req, &hdr);
2224         encode_sequence(xdr, &args->seq_args, &hdr);
2225         encode_putfh(xdr, args->old_dir, &hdr);
2226         encode_savefh(xdr, &hdr);
2227         encode_putfh(xdr, args->new_dir, &hdr);
2228         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2229         encode_nops(&hdr);
2230 }
2231 
2232 /*
2233  * Encode LINK request
2234  */
2235 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2236                               const void *data)
2237 {
2238         const struct nfs4_link_arg *args = data;
2239         struct compound_hdr hdr = {
2240                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2241         };
2242 
2243         encode_compound_hdr(xdr, req, &hdr);
2244         encode_sequence(xdr, &args->seq_args, &hdr);
2245         encode_putfh(xdr, args->fh, &hdr);
2246         encode_savefh(xdr, &hdr);
2247         encode_putfh(xdr, args->dir_fh, &hdr);
2248         encode_link(xdr, args->name, &hdr);
2249         encode_restorefh(xdr, &hdr);
2250         encode_getfattr(xdr, args->bitmask, &hdr);
2251         encode_nops(&hdr);
2252 }
2253 
2254 /*
2255  * Encode CREATE request
2256  */
2257 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2258                                 const void *data)
2259 {
2260         const struct nfs4_create_arg *args = data;
2261         struct compound_hdr hdr = {
2262                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2263         };
2264 
2265         encode_compound_hdr(xdr, req, &hdr);
2266         encode_sequence(xdr, &args->seq_args, &hdr);
2267         encode_putfh(xdr, args->dir_fh, &hdr);
2268         encode_create(xdr, args, &hdr);
2269         encode_getfh(xdr, &hdr);
2270         encode_getfattr(xdr, args->bitmask, &hdr);
2271         encode_nops(&hdr);
2272 }
2273 
2274 /*
2275  * Encode SYMLINK request
2276  */
2277 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2278                                  const void *data)
2279 {
2280         const struct nfs4_create_arg *args = data;
2281 
2282         nfs4_xdr_enc_create(req, xdr, args);
2283 }
2284 
2285 /*
2286  * Encode GETATTR request
2287  */
2288 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2289                                  const void *data)
2290 {
2291         const struct nfs4_getattr_arg *args = data;
2292         struct compound_hdr hdr = {
2293                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2294         };
2295 
2296         encode_compound_hdr(xdr, req, &hdr);
2297         encode_sequence(xdr, &args->seq_args, &hdr);
2298         encode_putfh(xdr, args->fh, &hdr);
2299         encode_getfattr(xdr, args->bitmask, &hdr);
2300         encode_nops(&hdr);
2301 }
2302 
2303 /*
2304  * Encode a CLOSE request
2305  */
2306 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2307                                const void *data)
2308 {
2309         const struct nfs_closeargs *args = data;
2310         struct compound_hdr hdr = {
2311                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2312         };
2313 
2314         encode_compound_hdr(xdr, req, &hdr);
2315         encode_sequence(xdr, &args->seq_args, &hdr);
2316         encode_putfh(xdr, args->fh, &hdr);
2317         if (args->lr_args)
2318                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2319         if (args->bitmask != NULL)
2320                 encode_getfattr(xdr, args->bitmask, &hdr);
2321         encode_close(xdr, args, &hdr);
2322         encode_nops(&hdr);
2323 }
2324 
2325 /*
2326  * Encode an OPEN request
2327  */
2328 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2329                               const void *data)
2330 {
2331         const struct nfs_openargs *args = data;
2332         struct compound_hdr hdr = {
2333                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2334         };
2335 
2336         encode_compound_hdr(xdr, req, &hdr);
2337         encode_sequence(xdr, &args->seq_args, &hdr);
2338         encode_putfh(xdr, args->fh, &hdr);
2339         encode_open(xdr, args, &hdr);
2340         encode_getfh(xdr, &hdr);
2341         if (args->access)
2342                 encode_access(xdr, args->access, &hdr);
2343         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2344         if (args->lg_args) {
2345                 encode_layoutget(xdr, args->lg_args, &hdr);
2346                 rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2347                                         args->lg_args->layout.pglen,
2348                                         hdr.replen);
2349         }
2350         encode_nops(&hdr);
2351 }
2352 
2353 /*
2354  * Encode an OPEN_CONFIRM request
2355  */
2356 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2357                                       struct xdr_stream *xdr,
2358                                       const void *data)
2359 {
2360         const struct nfs_open_confirmargs *args = data;
2361         struct compound_hdr hdr = {
2362                 .nops   = 0,
2363         };
2364 
2365         encode_compound_hdr(xdr, req, &hdr);
2366         encode_putfh(xdr, args->fh, &hdr);
2367         encode_open_confirm(xdr, args, &hdr);
2368         encode_nops(&hdr);
2369 }
2370 
2371 /*
2372  * Encode an OPEN request with no attributes.
2373  */
2374 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2375                                      struct xdr_stream *xdr,
2376                                      const void *data)
2377 {
2378         const struct nfs_openargs *args = data;
2379         struct compound_hdr hdr = {
2380                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2381         };
2382 
2383         encode_compound_hdr(xdr, req, &hdr);
2384         encode_sequence(xdr, &args->seq_args, &hdr);
2385         encode_putfh(xdr, args->fh, &hdr);
2386         encode_open(xdr, args, &hdr);
2387         if (args->access)
2388                 encode_access(xdr, args->access, &hdr);
2389         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2390         if (args->lg_args) {
2391                 encode_layoutget(xdr, args->lg_args, &hdr);
2392                 rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2393                                         args->lg_args->layout.pglen,
2394                                         hdr.replen);
2395         }
2396         encode_nops(&hdr);
2397 }
2398 
2399 /*
2400  * Encode an OPEN_DOWNGRADE request
2401  */
2402 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2403                                         struct xdr_stream *xdr,
2404                                         const void *data)
2405 {
2406         const struct nfs_closeargs *args = data;
2407         struct compound_hdr hdr = {
2408                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2409         };
2410 
2411         encode_compound_hdr(xdr, req, &hdr);
2412         encode_sequence(xdr, &args->seq_args, &hdr);
2413         encode_putfh(xdr, args->fh, &hdr);
2414         if (args->lr_args)
2415                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2416         encode_open_downgrade(xdr, args, &hdr);
2417         encode_nops(&hdr);
2418 }
2419 
2420 /*
2421  * Encode a LOCK request
2422  */
2423 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2424                               const void *data)
2425 {
2426         const struct nfs_lock_args *args = data;
2427         struct compound_hdr hdr = {
2428                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2429         };
2430 
2431         encode_compound_hdr(xdr, req, &hdr);
2432         encode_sequence(xdr, &args->seq_args, &hdr);
2433         encode_putfh(xdr, args->fh, &hdr);
2434         encode_lock(xdr, args, &hdr);
2435         encode_nops(&hdr);
2436 }
2437 
2438 /*
2439  * Encode a LOCKT request
2440  */
2441 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2442                                const void *data)
2443 {
2444         const struct nfs_lockt_args *args = data;
2445         struct compound_hdr hdr = {
2446                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2447         };
2448 
2449         encode_compound_hdr(xdr, req, &hdr);
2450         encode_sequence(xdr, &args->seq_args, &hdr);
2451         encode_putfh(xdr, args->fh, &hdr);
2452         encode_lockt(xdr, args, &hdr);
2453         encode_nops(&hdr);
2454 }
2455 
2456 /*
2457  * Encode a LOCKU request
2458  */
2459 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2460                                const void *data)
2461 {
2462         const struct nfs_locku_args *args = data;
2463         struct compound_hdr hdr = {
2464                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2465         };
2466 
2467         encode_compound_hdr(xdr, req, &hdr);
2468         encode_sequence(xdr, &args->seq_args, &hdr);
2469         encode_putfh(xdr, args->fh, &hdr);
2470         encode_locku(xdr, args, &hdr);
2471         encode_nops(&hdr);
2472 }
2473 
2474 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2475                                            struct xdr_stream *xdr,
2476                                            const void *data)
2477 {
2478         const struct nfs_release_lockowner_args *args = data;
2479         struct compound_hdr hdr = {
2480                 .minorversion = 0,
2481         };
2482 
2483         encode_compound_hdr(xdr, req, &hdr);
2484         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2485         encode_nops(&hdr);
2486 }
2487 
2488 /*
2489  * Encode a READLINK request
2490  */
2491 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2492                                   const void *data)
2493 {
2494         const struct nfs4_readlink *args = data;
2495         struct compound_hdr hdr = {
2496                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2497         };
2498 
2499         encode_compound_hdr(xdr, req, &hdr);
2500         encode_sequence(xdr, &args->seq_args, &hdr);
2501         encode_putfh(xdr, args->fh, &hdr);
2502         encode_readlink(xdr, args, req, &hdr);
2503 
2504         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2505                                 args->pglen, hdr.replen);
2506         encode_nops(&hdr);
2507 }
2508 
2509 /*
2510  * Encode a READDIR request
2511  */
2512 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2513                                  const void *data)
2514 {
2515         const struct nfs4_readdir_arg *args = data;
2516         struct compound_hdr hdr = {
2517                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2518         };
2519 
2520         encode_compound_hdr(xdr, req, &hdr);
2521         encode_sequence(xdr, &args->seq_args, &hdr);
2522         encode_putfh(xdr, args->fh, &hdr);
2523         encode_readdir(xdr, args, req, &hdr);
2524 
2525         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2526                                 args->count, hdr.replen);
2527         encode_nops(&hdr);
2528 }
2529 
2530 /*
2531  * Encode a READ request
2532  */
2533 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2534                               const void *data)
2535 {
2536         const struct nfs_pgio_args *args = data;
2537         struct compound_hdr hdr = {
2538                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2539         };
2540 
2541         encode_compound_hdr(xdr, req, &hdr);
2542         encode_sequence(xdr, &args->seq_args, &hdr);
2543         encode_putfh(xdr, args->fh, &hdr);
2544         encode_read(xdr, args, &hdr);
2545 
2546         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2547                                 args->count, hdr.replen);
2548         req->rq_rcv_buf.flags |= XDRBUF_READ;
2549         encode_nops(&hdr);
2550 }
2551 
2552 /*
2553  * Encode an SETATTR request
2554  */
2555 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2556                                  const void *data)
2557 {
2558         const struct nfs_setattrargs *args = data;
2559         struct compound_hdr hdr = {
2560                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2561         };
2562 
2563         encode_compound_hdr(xdr, req, &hdr);
2564         encode_sequence(xdr, &args->seq_args, &hdr);
2565         encode_putfh(xdr, args->fh, &hdr);
2566         encode_setattr(xdr, args, args->server, &hdr);
2567         encode_getfattr(xdr, args->bitmask, &hdr);
2568         encode_nops(&hdr);
2569 }
2570 
2571 /*
2572  * Encode a GETACL request
2573  */
2574 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2575                                 const void *data)
2576 {
2577         const struct nfs_getaclargs *args = data;
2578         struct compound_hdr hdr = {
2579                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2580         };
2581         const __u32 nfs4_acl_bitmap[1] = {
2582                 [0] = FATTR4_WORD0_ACL,
2583         };
2584         uint32_t replen;
2585 
2586         encode_compound_hdr(xdr, req, &hdr);
2587         encode_sequence(xdr, &args->seq_args, &hdr);
2588         encode_putfh(xdr, args->fh, &hdr);
2589         replen = hdr.replen + op_decode_hdr_maxsz;
2590         encode_getattr(xdr, nfs4_acl_bitmap, NULL,
2591                         ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
2592 
2593         rpc_prepare_reply_pages(req, args->acl_pages, 0,
2594                                 args->acl_len, replen + 1);
2595         encode_nops(&hdr);
2596 }
2597 
2598 /*
2599  * Encode a WRITE request
2600  */
2601 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2602                                const void *data)
2603 {
2604         const struct nfs_pgio_args *args = data;
2605         struct compound_hdr hdr = {
2606                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2607         };
2608 
2609         encode_compound_hdr(xdr, req, &hdr);
2610         encode_sequence(xdr, &args->seq_args, &hdr);
2611         encode_putfh(xdr, args->fh, &hdr);
2612         encode_write(xdr, args, &hdr);
2613         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2614         if (args->bitmask)
2615                 encode_getfattr(xdr, args->bitmask, &hdr);
2616         encode_nops(&hdr);
2617 }
2618 
2619 /*
2620  *  a COMMIT request
2621  */
2622 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2623                                 const void *data)
2624 {
2625         const struct nfs_commitargs *args = data;
2626         struct compound_hdr hdr = {
2627                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2628         };
2629 
2630         encode_compound_hdr(xdr, req, &hdr);
2631         encode_sequence(xdr, &args->seq_args, &hdr);
2632         encode_putfh(xdr, args->fh, &hdr);
2633         encode_commit(xdr, args, &hdr);
2634         encode_nops(&hdr);
2635 }
2636 
2637 /*
2638  * FSINFO request
2639  */
2640 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2641                                 const void *data)
2642 {
2643         const struct nfs4_fsinfo_arg *args = data;
2644         struct compound_hdr hdr = {
2645                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2646         };
2647 
2648         encode_compound_hdr(xdr, req, &hdr);
2649         encode_sequence(xdr, &args->seq_args, &hdr);
2650         encode_putfh(xdr, args->fh, &hdr);
2651         encode_fsinfo(xdr, args->bitmask, &hdr);
2652         encode_nops(&hdr);
2653 }
2654 
2655 /*
2656  * a PATHCONF request
2657  */
2658 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2659                                   const void *data)
2660 {
2661         const struct nfs4_pathconf_arg *args = data;
2662         struct compound_hdr hdr = {
2663                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2664         };
2665 
2666         encode_compound_hdr(xdr, req, &hdr);
2667         encode_sequence(xdr, &args->seq_args, &hdr);
2668         encode_putfh(xdr, args->fh, &hdr);
2669         encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
2670                         ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
2671         encode_nops(&hdr);
2672 }
2673 
2674 /*
2675  * a STATFS request
2676  */
2677 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2678                                 const void *data)
2679 {
2680         const struct nfs4_statfs_arg *args = data;
2681         struct compound_hdr hdr = {
2682                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2683         };
2684 
2685         encode_compound_hdr(xdr, req, &hdr);
2686         encode_sequence(xdr, &args->seq_args, &hdr);
2687         encode_putfh(xdr, args->fh, &hdr);
2688         encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
2689                         ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
2690         encode_nops(&hdr);
2691 }
2692 
2693 /*
2694  * GETATTR_BITMAP request
2695  */
2696 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2697                                      struct xdr_stream *xdr,
2698                                      const void *data)
2699 {
2700         const struct nfs4_server_caps_arg *args = data;
2701         const u32 *bitmask = args->bitmask;
2702         struct compound_hdr hdr = {
2703                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2704         };
2705 
2706         encode_compound_hdr(xdr, req, &hdr);
2707         encode_sequence(xdr, &args->seq_args, &hdr);
2708         encode_putfh(xdr, args->fhandle, &hdr);
2709         encode_getattr(xdr, bitmask, NULL, 3, &hdr);
2710         encode_nops(&hdr);
2711 }
2712 
2713 /*
2714  * a RENEW request
2715  */
2716 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2717                                const void *data)
2718 
2719 {
2720         const struct nfs_client *clp = data;
2721         struct compound_hdr hdr = {
2722                 .nops   = 0,
2723         };
2724 
2725         encode_compound_hdr(xdr, req, &hdr);
2726         encode_renew(xdr, clp->cl_clientid, &hdr);
2727         encode_nops(&hdr);
2728 }
2729 
2730 /*
2731  * a SETCLIENTID request
2732  */
2733 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2734                                      struct xdr_stream *xdr,
2735                                      const void *data)
2736 {
2737         const struct nfs4_setclientid *sc = data;
2738         struct compound_hdr hdr = {
2739                 .nops   = 0,
2740         };
2741 
2742         encode_compound_hdr(xdr, req, &hdr);
2743         encode_setclientid(xdr, sc, &hdr);
2744         encode_nops(&hdr);
2745 }
2746 
2747 /*
2748  * a SETCLIENTID_CONFIRM request
2749  */
2750 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2751                                              struct xdr_stream *xdr,
2752                                              const void *data)
2753 {
2754         const struct nfs4_setclientid_res *arg = data;
2755         struct compound_hdr hdr = {
2756                 .nops   = 0,
2757         };
2758 
2759         encode_compound_hdr(xdr, req, &hdr);
2760         encode_setclientid_confirm(xdr, arg, &hdr);
2761         encode_nops(&hdr);
2762 }
2763 
2764 /*
2765  * DELEGRETURN request
2766  */
2767 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2768                                      struct xdr_stream *xdr,
2769                                      const void *data)
2770 {
2771         const struct nfs4_delegreturnargs *args = data;
2772         struct compound_hdr hdr = {
2773                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2774         };
2775 
2776         encode_compound_hdr(xdr, req, &hdr);
2777         encode_sequence(xdr, &args->seq_args, &hdr);
2778         encode_putfh(xdr, args->fhandle, &hdr);
2779         if (args->lr_args)
2780                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2781         if (args->bitmask)
2782                 encode_getfattr(xdr, args->bitmask, &hdr);
2783         encode_delegreturn(xdr, args->stateid, &hdr);
2784         encode_nops(&hdr);
2785 }
2786 
2787 /*
2788  * Encode FS_LOCATIONS request
2789  */
2790 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2791                                       struct xdr_stream *xdr,
2792                                       const void *data)
2793 {
2794         const struct nfs4_fs_locations_arg *args = data;
2795         struct compound_hdr hdr = {
2796                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2797         };
2798         uint32_t replen;
2799 
2800         encode_compound_hdr(xdr, req, &hdr);
2801         encode_sequence(xdr, &args->seq_args, &hdr);
2802         if (args->migration) {
2803                 encode_putfh(xdr, args->fh, &hdr);
2804                 replen = hdr.replen;
2805                 encode_fs_locations(xdr, args->bitmask, &hdr);
2806                 if (args->renew)
2807                         encode_renew(xdr, args->clientid, &hdr);
2808         } else {
2809                 encode_putfh(xdr, args->dir_fh, &hdr);
2810                 encode_lookup(xdr, args->name, &hdr);
2811                 replen = hdr.replen;
2812                 encode_fs_locations(xdr, args->bitmask, &hdr);
2813         }
2814 
2815         rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
2816                                 PAGE_SIZE, replen + 1);
2817         encode_nops(&hdr);
2818 }
2819 
2820 /*
2821  * Encode SECINFO request
2822  */
2823 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2824                                 struct xdr_stream *xdr,
2825                                 const void *data)
2826 {
2827         const struct nfs4_secinfo_arg *args = data;
2828         struct compound_hdr hdr = {
2829                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2830         };
2831 
2832         encode_compound_hdr(xdr, req, &hdr);
2833         encode_sequence(xdr, &args->seq_args, &hdr);
2834         encode_putfh(xdr, args->dir_fh, &hdr);
2835         encode_secinfo(xdr, args->name, &hdr);
2836         encode_nops(&hdr);
2837 }
2838 
2839 /*
2840  * Encode FSID_PRESENT request
2841  */
2842 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2843                                       struct xdr_stream *xdr,
2844                                       const void *data)
2845 {
2846         const struct nfs4_fsid_present_arg *args = data;
2847         struct compound_hdr hdr = {
2848                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2849         };
2850 
2851         encode_compound_hdr(xdr, req, &hdr);
2852         encode_sequence(xdr, &args->seq_args, &hdr);
2853         encode_putfh(xdr, args->fh, &hdr);
2854         encode_getfh(xdr, &hdr);
2855         if (args->renew)
2856                 encode_renew(xdr, args->clientid, &hdr);
2857         encode_nops(&hdr);
2858 }
2859 
2860 #if defined(CONFIG_NFS_V4_1)
2861 /*
2862  * BIND_CONN_TO_SESSION request
2863  */
2864 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2865                                 struct xdr_stream *xdr,
2866                                 const void *data)
2867 {
2868         const struct nfs41_bind_conn_to_session_args *args = data;
2869         struct compound_hdr hdr = {
2870                 .minorversion = args->client->cl_mvops->minor_version,
2871         };
2872 
2873         encode_compound_hdr(xdr, req, &hdr);
2874         encode_bind_conn_to_session(xdr, args, &hdr);
2875         encode_nops(&hdr);
2876 }
2877 
2878 /*
2879  * EXCHANGE_ID request
2880  */
2881 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2882                                      struct xdr_stream *xdr,
2883                                      const void *data)
2884 {
2885         const struct nfs41_exchange_id_args *args = data;
2886         struct compound_hdr hdr = {
2887                 .minorversion = args->client->cl_mvops->minor_version,
2888         };
2889 
2890         encode_compound_hdr(xdr, req, &hdr);
2891         encode_exchange_id(xdr, args, &hdr);
2892         encode_nops(&hdr);
2893 }
2894 
2895 /*
2896  * a CREATE_SESSION request
2897  */
2898 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2899                                         struct xdr_stream *xdr,
2900                                         const void *data)
2901 {
2902         const struct nfs41_create_session_args *args = data;
2903         struct compound_hdr hdr = {
2904                 .minorversion = args->client->cl_mvops->minor_version,
2905         };
2906 
2907         encode_compound_hdr(xdr, req, &hdr);
2908         encode_create_session(xdr, args, &hdr);
2909         encode_nops(&hdr);
2910 }
2911 
2912 /*
2913  * a DESTROY_SESSION request
2914  */
2915 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2916                                          struct xdr_stream *xdr,
2917                                          const void *data)
2918 {
2919         const struct nfs4_session *session = data;
2920         struct compound_hdr hdr = {
2921                 .minorversion = session->clp->cl_mvops->minor_version,
2922         };
2923 
2924         encode_compound_hdr(xdr, req, &hdr);
2925         encode_destroy_session(xdr, session, &hdr);
2926         encode_nops(&hdr);
2927 }
2928 
2929 /*
2930  * a DESTROY_CLIENTID request
2931  */
2932 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2933                                          struct xdr_stream *xdr,
2934                                          const void *data)
2935 {
2936         const struct nfs_client *clp = data;
2937         struct compound_hdr hdr = {
2938                 .minorversion = clp->cl_mvops->minor_version,
2939         };
2940 
2941         encode_compound_hdr(xdr, req, &hdr);
2942         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2943         encode_nops(&hdr);
2944 }
2945 
2946 /*
2947  * a SEQUENCE request
2948  */
2949 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2950                                   const void *data)
2951 {
2952         const struct nfs4_sequence_args *args = data;
2953         struct compound_hdr hdr = {
2954                 .minorversion = nfs4_xdr_minorversion(args),
2955         };
2956 
2957         encode_compound_hdr(xdr, req, &hdr);
2958         encode_sequence(xdr, args, &hdr);
2959         encode_nops(&hdr);
2960 }
2961 
2962 #endif
2963 
2964 /*
2965  * a GET_LEASE_TIME request
2966  */
2967 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2968                                         struct xdr_stream *xdr,
2969                                         const void *data)
2970 {
2971         const struct nfs4_get_lease_time_args *args = data;
2972         struct compound_hdr hdr = {
2973                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2974         };
2975         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2976 
2977         encode_compound_hdr(xdr, req, &hdr);
2978         encode_sequence(xdr, &args->la_seq_args, &hdr);
2979         encode_putrootfh(xdr, &hdr);
2980         encode_fsinfo(xdr, lease_bitmap, &hdr);
2981         encode_nops(&hdr);
2982 }
2983 
2984 #ifdef CONFIG_NFS_V4_1
2985 
2986 /*
2987  * a RECLAIM_COMPLETE request
2988  */
2989 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2990                                           struct xdr_stream *xdr,
2991                                           const void *data)
2992 {
2993         const struct nfs41_reclaim_complete_args *args = data;
2994         struct compound_hdr hdr = {
2995                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2996         };
2997 
2998         encode_compound_hdr(xdr, req, &hdr);
2999         encode_sequence(xdr, &args->seq_args, &hdr);
3000         encode_reclaim_complete(xdr, args, &hdr);
3001         encode_nops(&hdr);
3002 }
3003 
3004 /*
3005  * Encode GETDEVICEINFO request
3006  */
3007 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
3008                                        struct xdr_stream *xdr,
3009                                        const void *data)
3010 {
3011         const struct nfs4_getdeviceinfo_args *args = data;
3012         struct compound_hdr hdr = {
3013                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3014         };
3015 
3016         encode_compound_hdr(xdr, req, &hdr);
3017         encode_sequence(xdr, &args->seq_args, &hdr);
3018         encode_getdeviceinfo(xdr, args, &hdr);
3019 
3020         /* set up reply kvec. Subtract notification bitmap max size (2)
3021          * so that notification bitmap is put in xdr_buf tail */
3022         rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
3023                                 args->pdev->pglen, hdr.replen - 2);
3024         encode_nops(&hdr);
3025 }
3026 
3027 /*
3028  *  Encode LAYOUTGET request
3029  */
3030 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
3031                                    struct xdr_stream *xdr,
3032                                    const void *data)
3033 {
3034         const struct nfs4_layoutget_args *args = data;
3035         struct compound_hdr hdr = {
3036                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3037         };
3038 
3039         encode_compound_hdr(xdr, req, &hdr);
3040         encode_sequence(xdr, &args->seq_args, &hdr);
3041         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3042         encode_layoutget(xdr, args, &hdr);
3043 
3044         rpc_prepare_reply_pages(req, args->layout.pages, 0,
3045                                 args->layout.pglen, hdr.replen);
3046         encode_nops(&hdr);
3047 }
3048 
3049 /*
3050  *  Encode LAYOUTCOMMIT request
3051  */
3052 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
3053                                       struct xdr_stream *xdr,
3054                                       const void *priv)
3055 {
3056         const struct nfs4_layoutcommit_args *args = priv;
3057         struct nfs4_layoutcommit_data *data =
3058                 container_of(args, struct nfs4_layoutcommit_data, args);
3059         struct compound_hdr hdr = {
3060                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3061         };
3062 
3063         encode_compound_hdr(xdr, req, &hdr);
3064         encode_sequence(xdr, &args->seq_args, &hdr);
3065         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3066         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
3067         encode_getfattr(xdr, args->bitmask, &hdr);
3068         encode_nops(&hdr);
3069 }
3070 
3071 /*
3072  * Encode LAYOUTRETURN request
3073  */
3074 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
3075                                       struct xdr_stream *xdr,
3076                                       const void *data)
3077 {
3078         const struct nfs4_layoutreturn_args *args = data;
3079         struct compound_hdr hdr = {
3080                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3081         };
3082 
3083         encode_compound_hdr(xdr, req, &hdr);
3084         encode_sequence(xdr, &args->seq_args, &hdr);
3085         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3086         encode_layoutreturn(xdr, args, &hdr);
3087         encode_nops(&hdr);
3088 }
3089 
3090 /*
3091  * Encode SECINFO_NO_NAME request
3092  */
3093 static void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3094                                         struct xdr_stream *xdr,
3095                                         const void *data)
3096 {
3097         const struct nfs41_secinfo_no_name_args *args = data;
3098         struct compound_hdr hdr = {
3099                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3100         };
3101 
3102         encode_compound_hdr(xdr, req, &hdr);
3103         encode_sequence(xdr, &args->seq_args, &hdr);
3104         encode_putrootfh(xdr, &hdr);
3105         encode_secinfo_no_name(xdr, args, &hdr);
3106         encode_nops(&hdr);
3107 }
3108 
3109 /*
3110  *  Encode TEST_STATEID request
3111  */
3112 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3113                                       struct xdr_stream *xdr,
3114                                       const void *data)
3115 {
3116         const struct nfs41_test_stateid_args *args = data;
3117         struct compound_hdr hdr = {
3118                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3119         };
3120 
3121         encode_compound_hdr(xdr, req, &hdr);
3122         encode_sequence(xdr, &args->seq_args, &hdr);
3123         encode_test_stateid(xdr, args, &hdr);
3124         encode_nops(&hdr);
3125 }
3126 
3127 /*
3128  *  Encode FREE_STATEID request
3129  */
3130 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3131                                      struct xdr_stream *xdr,
3132                                      const void *data)
3133 {
3134         const struct nfs41_free_stateid_args *args = data;
3135         struct compound_hdr hdr = {
3136                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3137         };
3138 
3139         encode_compound_hdr(xdr, req, &hdr);
3140         encode_sequence(xdr, &args->seq_args, &hdr);
3141         encode_free_stateid(xdr, args, &hdr);
3142         encode_nops(&hdr);
3143 }
3144 #endif /* CONFIG_NFS_V4_1 */
3145 
3146 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3147 {
3148         ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
3149                         NFS4_OPAQUE_LIMIT);
3150         if (unlikely(ret < 0))
3151                 return -EIO;
3152         *len = ret;
3153         return 0;
3154 }
3155 
3156 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3157 {
3158         __be32 *p;
3159 
3160         p = xdr_inline_decode(xdr, 8);
3161         if (unlikely(!p))
3162                 return -EIO;
3163         hdr->status = be32_to_cpup(p++);
3164         hdr->taglen = be32_to_cpup(p);
3165 
3166         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3167         if (unlikely(!p))
3168                 return -EIO;
3169         hdr->tag = (char *)p;
3170         p += XDR_QUADLEN(hdr->taglen);
3171         hdr->nops = be32_to_cpup(p);
3172         if (unlikely(hdr->nops < 1))
3173                 return nfs4_stat_to_errno(hdr->status);
3174         return 0;
3175 }
3176 
3177 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3178                 int *nfs_retval)
3179 {
3180         __be32 *p;
3181         uint32_t opnum;
3182         int32_t nfserr;
3183 
3184         p = xdr_inline_decode(xdr, 8);
3185         if (unlikely(!p))
3186                 goto out_overflow;
3187         opnum = be32_to_cpup(p++);
3188         if (unlikely(opnum != expected))
3189                 goto out_bad_operation;
3190         if (unlikely(*p != cpu_to_be32(NFS_OK)))
3191                 goto out_status;
3192         *nfs_retval = 0;
3193         return true;
3194 out_status:
3195         nfserr = be32_to_cpup(p);
3196         trace_nfs4_xdr_status(xdr, opnum, nfserr);
3197         *nfs_retval = nfs4_stat_to_errno(nfserr);
3198         return true;
3199 out_bad_operation:
3200         dprintk("nfs: Server returned operation"
3201                 " %d but we issued a request for %d\n",
3202                         opnum, expected);
3203         *nfs_retval = -EREMOTEIO;
3204         return false;
3205 out_overflow:
3206         *nfs_retval = -EIO;
3207         return false;
3208 }
3209 
3210 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3211 {
3212         int retval;
3213 
3214         __decode_op_hdr(xdr, expected, &retval);
3215         return retval;
3216 }
3217 
3218 /* Dummy routine */
3219 static int decode_ace(struct xdr_stream *xdr, void *ace)
3220 {
3221         __be32 *p;
3222         unsigned int strlen;
3223         char *str;
3224 
3225         p = xdr_inline_decode(xdr, 12);
3226         if (unlikely(!p))
3227                 return -EIO;
3228         return decode_opaque_inline(xdr, &strlen, &str);
3229 }
3230 
3231 static ssize_t
3232 decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
3233 {
3234         ssize_t ret;
3235 
3236         ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
3237         if (likely(ret >= 0))
3238                 return ret;
3239         if (ret != -EMSGSIZE)
3240                 return -EIO;
3241         return sz;
3242 }
3243 
3244 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3245 {
3246         ssize_t ret;
3247         ret = decode_bitmap4(xdr, bitmap, 3);
3248         return ret < 0 ? ret : 0;
3249 }
3250 
3251 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3252 {
3253         __be32 *p;
3254 
3255         p = xdr_inline_decode(xdr, 4);
3256         if (unlikely(!p))
3257                 return -EIO;
3258         *attrlen = be32_to_cpup(p);
3259         *savep = xdr_stream_pos(xdr);
3260         return 0;
3261 }
3262 
3263 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3264 {
3265         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3266                 int ret;
3267                 ret = decode_attr_bitmap(xdr, bitmask);
3268                 if (unlikely(ret < 0))
3269                         return ret;
3270                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3271         } else
3272                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3273         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3274                 bitmask[0], bitmask[1], bitmask[2]);
3275         return 0;
3276 }
3277 
3278 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3279 {
3280         __be32 *p;
3281         int ret = 0;
3282 
3283         *type = 0;
3284         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3285                 return -EIO;
3286         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3287                 p = xdr_inline_decode(xdr, 4);
3288                 if (unlikely(!p))
3289                         return -EIO;
3290                 *type = be32_to_cpup(p);
3291                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3292                         dprintk("%s: bad type %d\n", __func__, *type);
3293                         return -EIO;
3294                 }
3295                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3296                 ret = NFS_ATTR_FATTR_TYPE;
3297         }
3298         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3299         return ret;
3300 }
3301 
3302 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3303                                       uint32_t *bitmap, uint32_t *type)
3304 {
3305         __be32 *p;
3306 
3307         *type = 0;
3308         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3309                 return -EIO;
3310         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3311                 p = xdr_inline_decode(xdr, 4);
3312                 if (unlikely(!p))
3313                         return -EIO;
3314                 *type = be32_to_cpup(p);
3315                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3316         }
3317         dprintk("%s: expire type=0x%x\n", __func__, *type);
3318         return 0;
3319 }
3320 
3321 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3322 {
3323         __be32 *p;
3324         int ret = 0;
3325 
3326         *change = 0;
3327         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3328                 return -EIO;
3329         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3330                 p = xdr_inline_decode(xdr, 8);
3331                 if (unlikely(!p))
3332                         return -EIO;
3333                 xdr_decode_hyper(p, change);
3334                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3335                 ret = NFS_ATTR_FATTR_CHANGE;
3336         }
3337         dprintk("%s: change attribute=%Lu\n", __func__,
3338                         (unsigned long long)*change);
3339         return ret;
3340 }
3341 
3342 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3343 {
3344         __be32 *p;
3345         int ret = 0;
3346 
3347         *size = 0;
3348         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3349                 return -EIO;
3350         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3351                 p = xdr_inline_decode(xdr, 8);
3352                 if (unlikely(!p))
3353                         return -EIO;
3354                 xdr_decode_hyper(p, size);
3355                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3356                 ret = NFS_ATTR_FATTR_SIZE;
3357         }
3358         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3359         return ret;
3360 }
3361 
3362 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3363 {
3364         __be32 *p;
3365 
3366         *res = 0;
3367         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3368                 return -EIO;
3369         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3370                 p = xdr_inline_decode(xdr, 4);
3371                 if (unlikely(!p))
3372                         return -EIO;
3373                 *res = be32_to_cpup(p);
3374                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3375         }
3376         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3377         return 0;
3378 }
3379 
3380 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3381 {
3382         __be32 *p;
3383 
3384         *res = 0;
3385         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3386                 return -EIO;
3387         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3388                 p = xdr_inline_decode(xdr, 4);
3389                 if (unlikely(!p))
3390                         return -EIO;
3391                 *res = be32_to_cpup(p);
3392                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3393         }
3394         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3395         return 0;
3396 }
3397 
3398 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3399 {
3400         __be32 *p;
3401         int ret = 0;
3402 
3403         fsid->major = 0;
3404         fsid->minor = 0;
3405         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3406                 return -EIO;
3407         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3408                 p = xdr_inline_decode(xdr, 16);
3409                 if (unlikely(!p))
3410                         return -EIO;
3411                 p = xdr_decode_hyper(p, &fsid->major);
3412                 xdr_decode_hyper(p, &fsid->minor);
3413                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3414                 ret = NFS_ATTR_FATTR_FSID;
3415         }
3416         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3417                         (unsigned long long)fsid->major,
3418                         (unsigned long long)fsid->minor);
3419         return ret;
3420 }
3421 
3422 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3423 {
3424         __be32 *p;
3425 
3426         *res = 60;
3427         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3428                 return -EIO;
3429         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3430                 p = xdr_inline_decode(xdr, 4);
3431                 if (unlikely(!p))
3432                         return -EIO;
3433                 *res = be32_to_cpup(p);
3434                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3435         }
3436         dprintk("%s: lease time=%u\n", __func__, (unsigned int)*res);
3437         return 0;
3438 }
3439 
3440 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3441 {
3442         __be32 *p;
3443 
3444         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3445                 return -EIO;
3446         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3447                 p = xdr_inline_decode(xdr, 4);
3448                 if (unlikely(!p))
3449                         return -EIO;
3450                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3451                 *res = -be32_to_cpup(p);
3452         }
3453         return 0;
3454 }
3455 
3456 static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
3457                                  uint32_t *bitmap, uint32_t *bitmask)
3458 {
3459         if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
3460                 int ret;
3461                 ret = decode_attr_bitmap(xdr, bitmask);
3462                 if (unlikely(ret < 0))
3463                         return ret;
3464                 bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3465         } else
3466                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3467         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3468                 bitmask[0], bitmask[1], bitmask[2]);
3469         return 0;
3470 }
3471 
3472 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3473 {
3474         __be32 *p;
3475         u32 len;
3476 
3477         if (fh != NULL)
3478                 memset(fh, 0, sizeof(*fh));
3479 
3480         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3481                 return -EIO;
3482         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3483                 p = xdr_inline_decode(xdr, 4);
3484                 if (unlikely(!p))
3485                         return -EIO;
3486                 len = be32_to_cpup(p);
3487                 if (len > NFS4_FHSIZE)
3488                         return -EIO;
3489                 p = xdr_inline_decode(xdr, len);
3490                 if (unlikely(!p))
3491                         return -EIO;
3492                 if (fh != NULL) {
3493                         memcpy(fh->data, p, len);
3494                         fh->size = len;
3495                 }
3496                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3497         }
3498         return 0;
3499 }
3500 
3501 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3502 {
3503         __be32 *p;
3504 
3505         *res = 0;
3506         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3507                 return -EIO;
3508         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3509                 p = xdr_inline_decode(xdr, 4);
3510                 if (unlikely(!p))
3511                         return -EIO;
3512                 *res = be32_to_cpup(p);
3513                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3514         }
3515         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3516         return 0;
3517 }
3518 
3519 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3520 {
3521         __be32 *p;
3522         int ret = 0;
3523 
3524         *fileid = 0;
3525         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3526                 return -EIO;
3527         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3528                 p = xdr_inline_decode(xdr, 8);
3529                 if (unlikely(!p))
3530                         return -EIO;
3531                 xdr_decode_hyper(p, fileid);
3532                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3533                 ret = NFS_ATTR_FATTR_FILEID;
3534         }
3535         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3536         return ret;
3537 }
3538 
3539 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3540 {
3541         __be32 *p;
3542         int ret = 0;
3543 
3544         *fileid = 0;
3545         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3546                 return -EIO;
3547         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3548                 p = xdr_inline_decode(xdr, 8);
3549                 if (unlikely(!p))
3550                         return -EIO;
3551                 xdr_decode_hyper(p, fileid);
3552                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3553                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3554         }
3555         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3556         return ret;
3557 }
3558 
3559 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3560 {
3561         __be32 *p;
3562         int status = 0;
3563 
3564         *res = 0;
3565         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3566                 return -EIO;
3567         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3568                 p = xdr_inline_decode(xdr, 8);
3569                 if (unlikely(!p))
3570                         return -EIO;
3571                 xdr_decode_hyper(p, res);
3572                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3573         }
3574         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3575         return status;
3576 }
3577 
3578 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3579 {
3580         __be32 *p;
3581         int status = 0;
3582 
3583         *res = 0;
3584         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3585                 return -EIO;
3586         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3587                 p = xdr_inline_decode(xdr, 8);
3588                 if (unlikely(!p))
3589                         return -EIO;
3590                 xdr_decode_hyper(p, res);
3591                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3592         }
3593         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3594         return status;
3595 }
3596 
3597 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3598 {
3599         __be32 *p;
3600         int status = 0;
3601 
3602         *res = 0;
3603         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3604                 return -EIO;
3605         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3606                 p = xdr_inline_decode(xdr, 8);
3607                 if (unlikely(!p))
3608                         return -EIO;
3609                 xdr_decode_hyper(p, res);
3610                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3611         }
3612         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3613         return status;
3614 }
3615 
3616 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3617 {
3618         u32 n;
3619         __be32 *p;
3620         int status = 0;
3621 
3622         p = xdr_inline_decode(xdr, 4);
3623         if (unlikely(!p))
3624                 return -EIO;
3625         n = be32_to_cpup(p);
3626         if (n == 0)
3627                 goto root_path;
3628         dprintk("pathname4: ");
3629         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3630                 dprintk("cannot parse %d components in path\n", n);
3631                 goto out_eio;
3632         }
3633         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3634                 struct nfs4_string *component = &path->components[path->ncomponents];
3635                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3636                 if (unlikely(status != 0))
3637                         goto out_eio;
3638                 ifdebug (XDR)
3639                         pr_cont("%s%.*s ",
3640                                 (path->ncomponents != n ? "/ " : ""),
3641                                 component->len, component->data);
3642         }
3643 out:
3644         return status;
3645 root_path:
3646 /* a root pathname is sent as a zero component4 */
3647         path->ncomponents = 1;
3648         path->components[0].len=0;
3649         path->components[0].data=NULL;
3650         dprintk("pathname4: /\n");
3651         goto out;
3652 out_eio:
3653         dprintk(" status %d", status);
3654         status = -EIO;
3655         goto out;
3656 }
3657 
3658 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3659 {
3660         int n;
3661         __be32 *p;
3662         int status = -EIO;
3663 
3664         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3665                 goto out;
3666         status = 0;
3667         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3668                 goto out;
3669         bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
3670         status = -EIO;
3671         /* Ignore borken servers that return unrequested attrs */
3672         if (unlikely(res == NULL))
3673                 goto out;
3674         dprintk("%s: fsroot:\n", __func__);
3675         status = decode_pathname(xdr, &res->fs_path);
3676         if (unlikely(status != 0))
3677                 goto out;
3678         p = xdr_inline_decode(xdr, 4);
3679         if (unlikely(!p))
3680                 goto out_eio;
3681         n = be32_to_cpup(p);
3682         if (n <= 0)
3683                 goto out_eio;
3684         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3685                 u32 m;
3686                 struct nfs4_fs_location *loc;
3687 
3688                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3689                         break;
3690                 loc = &res->locations[res->nlocations];
3691                 p = xdr_inline_decode(xdr, 4);
3692                 if (unlikely(!p))
3693                         goto out_eio;
3694                 m = be32_to_cpup(p);
3695 
3696                 dprintk("%s: servers:\n", __func__);
3697                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3698                         struct nfs4_string *server;
3699 
3700                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3701                                 unsigned int i;
3702                                 dprintk("%s: using first %u of %u servers "
3703                                         "returned for location %u\n",
3704                                                 __func__,
3705                                                 NFS4_FS_LOCATION_MAXSERVERS,
3706                                                 m, res->nlocations);
3707                                 for (i = loc->nservers; i < m; i++) {
3708                                         unsigned int len;
3709                                         char *data;
3710                                         status = decode_opaque_inline(xdr, &len, &data);
3711                                         if (unlikely(status != 0))
3712                                                 goto out_eio;
3713                                 }
3714                                 break;
3715                         }
3716                         server = &loc->servers[loc->nservers];
3717                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3718                         if (unlikely(status != 0))
3719                                 goto out_eio;
3720                         dprintk("%s ", server->data);
3721                 }
3722                 status = decode_pathname(xdr, &loc->rootpath);
3723                 if (unlikely(status != 0))
3724                         goto out_eio;
3725         }
3726         if (res->nlocations != 0)
3727                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3728 out:
3729         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3730         return status;
3731 out_eio:
3732         status = -EIO;
3733         goto out;
3734 }
3735 
3736 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3737 {
3738         __be32 *p;
3739         int status = 0;
3740 
3741         *res = 0;
3742         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3743                 return -EIO;
3744         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3745                 p = xdr_inline_decode(xdr, 8);
3746                 if (unlikely(!p))
3747                         return -EIO;
3748                 xdr_decode_hyper(p, res);
3749                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3750         }
3751         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3752         return status;
3753 }
3754 
3755 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3756 {
3757         __be32 *p;
3758         int status = 0;
3759 
3760         *maxlink = 1;
3761         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3762                 return -EIO;
3763         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3764                 p = xdr_inline_decode(xdr, 4);
3765                 if (unlikely(!p))
3766                         return -EIO;
3767                 *maxlink = be32_to_cpup(p);
3768                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3769         }
3770         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3771         return status;
3772 }
3773 
3774 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3775 {
3776         __be32 *p;
3777         int status = 0;
3778 
3779         *maxname = 1024;
3780         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3781                 return -EIO;
3782         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3783                 p = xdr_inline_decode(xdr, 4);
3784                 if (unlikely(!p))
3785                         return -EIO;
3786                 *maxname = be32_to_cpup(p);
3787                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3788         }
3789         dprintk("%s: maxname=%u\n", __func__, *maxname);
3790         return status;
3791 }
3792 
3793 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3794 {
3795         __be32 *p;
3796         int status = 0;
3797 
3798         *res = 1024;
3799         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3800                 return -EIO;
3801         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3802                 uint64_t maxread;
3803                 p = xdr_inline_decode(xdr, 8);
3804                 if (unlikely(!p))
3805                         return -EIO;
3806                 xdr_decode_hyper(p, &maxread);
3807                 if (maxread > 0x7FFFFFFF)
3808                         maxread = 0x7FFFFFFF;
3809                 *res = (uint32_t)maxread;
3810                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3811         }
3812         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3813         return status;
3814 }
3815 
3816 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3817 {
3818         __be32 *p;
3819         int status = 0;
3820 
3821         *res = 1024;
3822         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3823                 return -EIO;
3824         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3825                 uint64_t maxwrite;
3826                 p = xdr_inline_decode(xdr, 8);
3827                 if (unlikely(!p))
3828                         return -EIO;
3829                 xdr_decode_hyper(p, &maxwrite);
3830                 if (maxwrite > 0x7FFFFFFF)
3831                         maxwrite = 0x7FFFFFFF;
3832                 *res = (uint32_t)maxwrite;
3833                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3834         }
3835         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3836         return status;
3837 }
3838 
3839 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3840 {
3841         uint32_t tmp;
3842         __be32 *p;
3843         int ret = 0;
3844 
3845         *mode = 0;
3846         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3847                 return -EIO;
3848         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3849                 p = xdr_inline_decode(xdr, 4);
3850                 if (unlikely(!p))
3851                         return -EIO;
3852                 tmp = be32_to_cpup(p);
3853                 *mode = tmp & ~S_IFMT;
3854                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3855                 ret = NFS_ATTR_FATTR_MODE;
3856         }
3857         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3858         return ret;
3859 }
3860 
3861 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3862 {
3863         __be32 *p;
3864         int ret = 0;
3865 
3866         *nlink = 1;
3867         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3868                 return -EIO;
3869         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3870                 p = xdr_inline_decode(xdr, 4);
3871                 if (unlikely(!p))
3872                         return -EIO;
3873                 *nlink = be32_to_cpup(p);
3874                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3875                 ret = NFS_ATTR_FATTR_NLINK;
3876         }
3877         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3878         return ret;
3879 }
3880 
3881 static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
3882                 struct nfs4_string *name, gfp_t gfp_flags)
3883 {
3884         ssize_t ret;
3885 
3886         ret = xdr_stream_decode_string_dup(xdr, &name->data,
3887                         XDR_MAX_NETOBJ, gfp_flags);
3888         name->len = 0;
3889         if (ret > 0)
3890                 name->len = ret;
3891         return ret;
3892 }
3893 
3894 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3895                 const struct nfs_server *server, kuid_t *uid,
3896                 struct nfs4_string *owner_name)
3897 {
3898         ssize_t len;
3899         char *p;
3900 
3901         *uid = make_kuid(&init_user_ns, -2);
3902         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3903                 return -EIO;
3904         if (!(bitmap[1] & FATTR4_WORD1_OWNER))
3905                 return 0;
3906         bitmap[1] &= ~FATTR4_WORD1_OWNER;
3907 
3908         if (owner_name != NULL) {
3909                 len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
3910                 if (len <= 0)
3911                         goto out;
3912                 dprintk("%s: name=%s\n", __func__, owner_name->data);
3913                 return NFS_ATTR_FATTR_OWNER_NAME;
3914         } else {
3915                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3916                                 XDR_MAX_NETOBJ);
3917                 if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
3918                         goto out;
3919                 dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3920                 return NFS_ATTR_FATTR_OWNER;
3921         }
3922 out:
3923         if (len == -EBADMSG)
3924                 return -EIO;
3925         return 0;
3926 }
3927 
3928 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3929                 const struct nfs_server *server, kgid_t *gid,
3930                 struct nfs4_string *group_name)
3931 {
3932         ssize_t len;
3933         char *p;
3934 
3935         *gid = make_kgid(&init_user_ns, -2);
3936         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3937                 return -EIO;
3938         if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
3939                 return 0;
3940         bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3941 
3942         if (group_name != NULL) {
3943                 len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
3944                 if (len <= 0)
3945                         goto out;
3946                 dprintk("%s: name=%s\n", __func__, group_name->data);
3947                 return NFS_ATTR_FATTR_GROUP_NAME;
3948         } else {
3949                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3950                                 XDR_MAX_NETOBJ);
3951                 if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
3952                         goto out;
3953                 dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3954                 return NFS_ATTR_FATTR_GROUP;
3955         }
3956 out:
3957         if (len == -EBADMSG)
3958                 return -EIO;
3959         return 0;
3960 }
3961 
3962 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3963 {
3964         uint32_t major = 0, minor = 0;
3965         __be32 *p;
3966         int ret = 0;
3967 
3968         *rdev = MKDEV(0,0);
3969         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3970                 return -EIO;
3971         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3972                 dev_t tmp;
3973 
3974                 p = xdr_inline_decode(xdr, 8);
3975                 if (unlikely(!p))
3976                         return -EIO;
3977                 major = be32_to_cpup(p++);
3978                 minor = be32_to_cpup(p);
3979                 tmp = MKDEV(major, minor);
3980                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3981                         *rdev = tmp;
3982                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3983                 ret = NFS_ATTR_FATTR_RDEV;
3984         }
3985         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3986         return ret;
3987 }
3988 
3989 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3990 {
3991         __be32 *p;
3992         int status = 0;
3993 
3994         *res = 0;
3995         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3996                 return -EIO;
3997         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3998                 p = xdr_inline_decode(xdr, 8);
3999                 if (unlikely(!p))
4000                         return -EIO;
4001                 xdr_decode_hyper(p, res);
4002                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
4003         }
4004         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
4005         return status;
4006 }
4007 
4008 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4009 {
4010         __be32 *p;
4011         int status = 0;
4012 
4013         *res = 0;
4014         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
4015                 return -EIO;
4016         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
4017                 p = xdr_inline_decode(xdr, 8);
4018                 if (unlikely(!p))
4019                         return -EIO;
4020                 xdr_decode_hyper(p, res);
4021                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
4022         }
4023         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
4024         return status;
4025 }
4026 
4027 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4028 {
4029         __be32 *p;
4030         int status = 0;
4031 
4032         *res = 0;
4033         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4034                 return -EIO;
4035         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4036                 p = xdr_inline_decode(xdr, 8);
4037                 if (unlikely(!p))
4038                         return -EIO;
4039                 xdr_decode_hyper(p, res);
4040                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4041         }
4042         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4043         return status;
4044 }
4045 
4046 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4047 {
4048         __be32 *p;
4049         int ret = 0;
4050 
4051         *used = 0;
4052         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4053                 return -EIO;
4054         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4055                 p = xdr_inline_decode(xdr, 8);
4056                 if (unlikely(!p))
4057                         return -EIO;
4058                 xdr_decode_hyper(p, used);
4059                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4060                 ret = NFS_ATTR_FATTR_SPACE_USED;
4061         }
4062         dprintk("%s: space used=%Lu\n", __func__,
4063                         (unsigned long long)*used);
4064         return ret;
4065 }
4066 
4067 static __be32 *
4068 xdr_decode_nfstime4(__be32 *p, struct timespec *t)
4069 {
4070         __u64 sec;
4071 
4072         p = xdr_decode_hyper(p, &sec);
4073         t-> tv_sec = (time_t)sec;
4074         t->tv_nsec = be32_to_cpup(p++);
4075         return p;
4076 }
4077 
4078 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4079 {
4080         __be32 *p;
4081 
4082         p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
4083         if (unlikely(!p))
4084                 return -EIO;
4085         xdr_decode_nfstime4(p, time);
4086         return 0;
4087 }
4088 
4089 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4090 {
4091         int status = 0;
4092 
4093         time->tv_sec = 0;
4094         time->tv_nsec = 0;
4095         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4096                 return -EIO;
4097         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4098                 status = decode_attr_time(xdr, time);
4099                 if (status == 0)
4100                         status = NFS_ATTR_FATTR_ATIME;
4101                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4102         }
4103         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4104         return status;
4105 }
4106 
4107 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4108 {
4109         int status = 0;
4110 
4111         time->tv_sec = 0;
4112         time->tv_nsec = 0;
4113         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4114                 return -EIO;
4115         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4116                 status = decode_attr_time(xdr, time);
4117                 if (status == 0)
4118                         status = NFS_ATTR_FATTR_CTIME;
4119                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4120         }
4121         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4122         return status;
4123 }
4124 
4125 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4126                                   struct timespec *time)
4127 {
4128         int status = 0;
4129 
4130         time->tv_sec = 0;
4131         time->tv_nsec = 0;
4132         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4133                 return -EIO;
4134         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4135                 status = decode_attr_time(xdr, time);
4136                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4137         }
4138         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4139                 (long)time->tv_nsec);
4140         return status;
4141 }
4142 
4143 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4144                                         struct nfs4_label *label)
4145 {
4146         uint32_t pi = 0;
4147         uint32_t lfs = 0;
4148         __u32 len;
4149         __be32 *p;
4150         int status = 0;
4151 
4152         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4153                 return -EIO;
4154         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4155                 p = xdr_inline_decode(xdr, 4);
4156                 if (unlikely(!p))
4157                         return -EIO;
4158                 lfs = be32_to_cpup(p++);
4159                 p = xdr_inline_decode(xdr, 4);
4160                 if (unlikely(!p))
4161                         return -EIO;
4162                 pi = be32_to_cpup(p++);
4163                 p = xdr_inline_decode(xdr, 4);
4164                 if (unlikely(!p))
4165                         return -EIO;
4166                 len = be32_to_cpup(p++);
4167                 p = xdr_inline_decode(xdr, len);
4168                 if (unlikely(!p))
4169                         return -EIO;
4170                 if (len < NFS4_MAXLABELLEN) {
4171                         if (label) {
4172                                 memcpy(label->label, p, len);
4173                                 label->len = len;
4174                                 label->pi = pi;
4175                                 label->lfs = lfs;
4176                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4177                         }
4178                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4179                 } else
4180                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4181                                         __func__, len);
4182         }
4183         if (label && label->label)
4184                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4185                         (char *)label->label, label->len, label->pi, label->lfs);
4186         return status;
4187 }
4188 
4189 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4190 {
4191         int status = 0;
4192 
4193         time->tv_sec = 0;
4194         time->tv_nsec = 0;
4195         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4196                 return -EIO;
4197         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4198                 status = decode_attr_time(xdr, time);
4199                 if (status == 0)
4200                         status = NFS_ATTR_FATTR_MTIME;
4201                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4202         }
4203         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4204         return status;
4205 }
4206 
4207 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4208 {
4209         unsigned int attrwords = XDR_QUADLEN(attrlen);
4210         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4211 
4212         if (unlikely(attrwords != nwords)) {
4213                 dprintk("%s: server returned incorrect attribute length: "
4214                         "%u %c %u\n",
4215                                 __func__,
4216                                 attrwords << 2,
4217                                 (attrwords < nwords) ? '<' : '>',
4218                                 nwords << 2);
4219                 return -EIO;
4220         }
4221         return 0;
4222 }
4223 
4224 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4225 {
4226         __be32 *p;
4227 
4228         p = xdr_inline_decode(xdr, 20);
4229         if (unlikely(!p))
4230                 return -EIO;
4231         cinfo->atomic = be32_to_cpup(p++);
4232         p = xdr_decode_hyper(p, &cinfo->before);
4233         xdr_decode_hyper(p, &cinfo->after);
4234         return 0;
4235 }
4236 
4237 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4238 {
4239         __be32 *p;
4240         uint32_t supp, acc;
4241         int status;
4242 
4243         status = decode_op_hdr(xdr, OP_ACCESS);
4244         if (status)
4245                 return status;
4246         p = xdr_inline_decode(xdr, 8);
4247         if (unlikely(!p))
4248                 return -EIO;
4249         supp = be32_to_cpup(p++);
4250         acc = be32_to_cpup(p);
4251         *supported = supp;
4252         *access = acc;
4253         return 0;
4254 }
4255 
4256 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4257 {
4258         ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
4259         if (unlikely(ret < 0))
4260                 return -EIO;
4261         return 0;
4262 }
4263 
4264 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4265 {
4266         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4267 }
4268 
4269 static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4270 {
4271         stateid->type = NFS4_OPEN_STATEID_TYPE;
4272         return decode_stateid(xdr, stateid);
4273 }
4274 
4275 static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4276 {
4277         stateid->type = NFS4_LOCK_STATEID_TYPE;
4278         return decode_stateid(xdr, stateid);
4279 }
4280 
4281 static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4282 {
4283         stateid->type = NFS4_DELEGATION_STATEID_TYPE;
4284         return decode_stateid(xdr, stateid);
4285 }
4286 
4287 static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4288 {
4289         nfs4_stateid dummy;
4290 
4291         nfs4_stateid_copy(stateid, &invalid_stateid);
4292         return decode_stateid(xdr, &dummy);
4293 }
4294 
4295 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4296 {
4297         int status;
4298 
4299         status = decode_op_hdr(xdr, OP_CLOSE);
4300         if (status != -EIO)
4301                 nfs_increment_open_seqid(status, res->seqid);
4302         if (!status)
4303                 status = decode_invalid_stateid(xdr, &res->stateid);
4304         return status;
4305 }
4306 
4307 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4308 {
4309         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4310 }
4311 
4312 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4313 {
4314         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4315 }
4316 
4317 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4318 {
4319         struct nfs_writeverf *verf = res->verf;
4320         int status;
4321 
4322         status = decode_op_hdr(xdr, OP_COMMIT);
4323         if (!status)
4324                 status = decode_write_verifier(xdr, &verf->verifier);
4325         if (!status)
4326                 verf->committed = NFS_FILE_SYNC;
4327         return status;
4328 }
4329 
4330 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4331 {
4332         __be32 *p;
4333         uint32_t bmlen;
4334         int status;
4335 
4336         status = decode_op_hdr(xdr, OP_CREATE);
4337         if (status)
4338                 return status;
4339         if ((status = decode_change_info(xdr, cinfo)))
4340                 return status;
4341         p = xdr_inline_decode(xdr, 4);
4342         if (unlikely(!p))
4343                 return -EIO;
4344         bmlen = be32_to_cpup(p);
4345         p = xdr_inline_decode(xdr, bmlen << 2);
4346         if (likely(p))
4347                 return 0;
4348         return -EIO;
4349 }
4350 
4351 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4352 {
4353         unsigned int savep;
4354         uint32_t attrlen, bitmap[3] = {0};
4355         int status;
4356 
4357         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4358                 goto xdr_error;
4359         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4360                 goto xdr_error;
4361         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4362                 goto xdr_error;
4363         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4364                 goto xdr_error;
4365         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4366                                                  &res->fh_expire_type)) != 0)
4367                 goto xdr_error;
4368         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4369                 goto xdr_error;
4370         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4371                 goto xdr_error;
4372         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4373                 goto xdr_error;
4374         if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
4375                                 res->exclcreat_bitmask)) != 0)
4376                 goto xdr_error;
4377         status = verify_attr_len(xdr, savep, attrlen);
4378 xdr_error:
4379         dprintk("%s: xdr returned %d!\n", __func__, -status);
4380         return status;
4381 }
4382 
4383 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4384 {
4385         unsigned int savep;
4386         uint32_t attrlen, bitmap[3] = {0};
4387         int status;
4388 
4389         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4390                 goto xdr_error;
4391         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4392                 goto xdr_error;
4393         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4394                 goto xdr_error;
4395 
4396         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4397                 goto xdr_error;
4398         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4399                 goto xdr_error;
4400         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4401                 goto xdr_error;
4402 
4403         status = -EIO;
4404         if (unlikely(bitmap[0]))
4405                 goto xdr_error;
4406 
4407         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4408                 goto xdr_error;
4409         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4410                 goto xdr_error;
4411         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4412                 goto xdr_error;
4413 
4414         status = verify_attr_len(xdr, savep, attrlen);
4415 xdr_error:
4416         dprintk("%s: xdr returned %d!\n", __func__, -status);
4417         return status;
4418 }
4419 
4420 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4421 {
4422         unsigned int savep;
4423         uint32_t attrlen, bitmap[3] = {0};
4424         int status;
4425 
4426         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4427                 goto xdr_error;
4428         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4429                 goto xdr_error;
4430         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4431                 goto xdr_error;
4432 
4433         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4434                 goto xdr_error;
4435         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4436                 goto xdr_error;
4437 
4438         status = verify_attr_len(xdr, savep, attrlen);
4439 xdr_error:
4440         dprintk("%s: xdr returned %d!\n", __func__, -status);
4441         return status;
4442 }
4443 
4444 static int decode_threshold_hint(struct xdr_stream *xdr,
4445                                   uint32_t *bitmap,
4446                                   uint64_t *res,
4447                                   uint32_t hint_bit)
4448 {
4449         __be32 *p;
4450 
4451         *res = 0;
4452         if (likely(bitmap[0] & hint_bit)) {
4453                 p = xdr_inline_decode(xdr, 8);
4454                 if (unlikely(!p))
4455                         return -EIO;
4456                 xdr_decode_hyper(p, res);
4457         }
4458         return 0;
4459 }
4460 
4461 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4462                                         struct nfs4_threshold *res)
4463 {
4464         __be32 *p;
4465         unsigned int savep;
4466         uint32_t bitmap[3] = {0,}, attrlen;
4467         int status;
4468 
4469         /* layout type */
4470         p = xdr_inline_decode(xdr, 4);
4471         if (unlikely(!p))
4472                 return -EIO;
4473         res->l_type = be32_to_cpup(p);
4474 
4475         /* thi_hintset bitmap */
4476         status = decode_attr_bitmap(xdr, bitmap);
4477         if (status < 0)
4478                 goto xdr_error;
4479 
4480         /* thi_hintlist length */
4481         status = decode_attr_length(xdr, &attrlen, &savep);
4482         if (status < 0)
4483                 goto xdr_error;
4484         /* thi_hintlist */
4485         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4486         if (status < 0)
4487                 goto xdr_error;
4488         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4489         if (status < 0)
4490                 goto xdr_error;
4491         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4492                                        THRESHOLD_RD_IO);
4493         if (status < 0)
4494                 goto xdr_error;
4495         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4496                                        THRESHOLD_WR_IO);
4497         if (status < 0)
4498                 goto xdr_error;
4499 
4500         status = verify_attr_len(xdr, savep, attrlen);
4501         res->bm = bitmap[0];
4502 
4503         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4504                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4505                 res->wr_io_sz);
4506 xdr_error:
4507         dprintk("%s ret=%d!\n", __func__, status);
4508         return status;
4509 }
4510 
4511 /*
4512  * Thresholds on pNFS direct I/O vrs MDS I/O
4513  */
4514 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4515                                     uint32_t *bitmap,
4516                                     struct nfs4_threshold *res)
4517 {
4518         __be32 *p;
4519         int status = 0;
4520         uint32_t num;
4521 
4522         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4523                 return -EIO;
4524         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4525                 /* Did the server return an unrequested attribute? */
4526                 if (unlikely(res == NULL))
4527                         return -EREMOTEIO;
4528                 p = xdr_inline_decode(xdr, 4);
4529                 if (unlikely(!p))
4530                         return -EIO;
4531                 num = be32_to_cpup(p);
4532                 if (num == 0)
4533                         return 0;
4534                 if (num > 1)
4535                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4536                                 "drivers per filesystem not supported\n",
4537                                 __func__);
4538 
4539                 status = decode_first_threshold_item4(xdr, res);
4540                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4541         }
4542         return status;
4543 }
4544 
4545 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4546                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4547                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4548                 const struct nfs_server *server)
4549 {
4550         int status;
4551         umode_t fmode = 0;
4552         uint32_t type;
4553         int32_t err;
4554 
4555         status = decode_attr_type(xdr, bitmap, &type);
4556         if (status < 0)
4557                 goto xdr_error;
4558         fattr->mode = 0;
4559         if (status != 0) {
4560                 fattr->mode |= nfs_type2fmt[type];
4561                 fattr->valid |= status;
4562         }
4563 
4564         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4565         if (status < 0)
4566                 goto xdr_error;
4567         fattr->valid |= status;
4568 
4569         status = decode_attr_size(xdr, bitmap, &fattr->size);
4570         if (status < 0)
4571                 goto xdr_error;
4572         fattr->valid |= status;
4573 
4574         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4575         if (status < 0)
4576                 goto xdr_error;
4577         fattr->valid |= status;
4578 
4579         err = 0;
4580         status = decode_attr_error(xdr, bitmap, &err);
4581         if (status < 0)
4582                 goto xdr_error;
4583 
4584         status = decode_attr_filehandle(xdr, bitmap, fh);
4585         if (status < 0)
4586                 goto xdr_error;
4587 
4588         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4589         if (status < 0)
4590                 goto xdr_error;
4591         fattr->valid |= status;
4592 
4593         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4594         if (status < 0)
4595                 goto xdr_error;
4596         fattr->valid |= status;
4597 
4598         status = -EIO;
4599         if (unlikely(bitmap[0]))
4600                 goto xdr_error;
4601 
4602         status = decode_attr_mode(xdr, bitmap, &fmode);
4603         if (status < 0)
4604                 goto xdr_error;
4605         if (status != 0) {
4606                 fattr->mode |= fmode;
4607                 fattr->valid |= status;
4608         }
4609 
4610         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4611         if (status < 0)
4612                 goto xdr_error;
4613         fattr->valid |= status;
4614 
4615         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4616         if (status < 0)
4617                 goto xdr_error;
4618         fattr->valid |= status;
4619 
4620         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4621         if (status < 0)
4622                 goto xdr_error;
4623         fattr->valid |= status;
4624 
4625         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4626         if (status < 0)
4627                 goto xdr_error;
4628         fattr->valid |= status;
4629 
4630         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4631         if (status < 0)
4632                 goto xdr_error;
4633         fattr->valid |= status;
4634 
4635         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4636         if (status < 0)
4637                 goto xdr_error;
4638         fattr->valid |= status;
4639 
4640         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4641         if (status < 0)
4642                 goto xdr_error;
4643         fattr->valid |= status;
4644 
4645         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4646         if (status < 0)
4647                 goto xdr_error;
4648         fattr->valid |= status;
4649 
4650         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4651         if (status < 0)
4652                 goto xdr_error;
4653         fattr->valid |= status;
4654 
4655         status = -EIO;
4656         if (unlikely(bitmap[1]))
4657                 goto xdr_error;
4658 
4659         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4660         if (status < 0)
4661                 goto xdr_error;
4662 
4663         if (label) {
4664                 status = decode_attr_security_label(xdr, bitmap, label);
4665                 if (status < 0)
4666                         goto xdr_error;
4667                 fattr->valid |= status;
4668         }
4669 
4670 xdr_error:
4671         dprintk("%s: xdr returned %d\n", __func__, -status);
4672         return status;
4673 }
4674 
4675 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4676                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4677                 struct nfs4_label *label, const struct nfs_server *server)
4678 {
4679         unsigned int savep;
4680         uint32_t attrlen,
4681                  bitmap[3] = {0};
4682         int status;
4683 
4684         status = decode_op_hdr(xdr, OP_GETATTR);
4685         if (status < 0)
4686                 goto xdr_error;
4687 
4688         status = decode_attr_bitmap(xdr, bitmap);
4689         if (status < 0)
4690                 goto xdr_error;
4691 
4692         status = decode_attr_length(xdr, &attrlen, &savep);
4693         if (status < 0)
4694                 goto xdr_error;
4695 
4696         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4697                                         label, server);
4698         if (status < 0)
4699                 goto xdr_error;
4700 
4701         status = verify_attr_len(xdr, savep, attrlen);
4702 xdr_error:
4703         dprintk("%s: xdr returned %d\n", __func__, -status);
4704         return status;
4705 }
4706 
4707 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4708                 struct nfs4_label *label, const struct nfs_server *server)
4709 {
4710         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4711 }
4712 
4713 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4714                 const struct nfs_server *server)
4715 {
4716         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4717 }
4718 
4719 /*
4720  * Decode potentially multiple layout types.
4721  */
4722 static int decode_pnfs_layout_types(struct xdr_stream *xdr,
4723                                     struct nfs_fsinfo *fsinfo)
4724 {
4725         __be32 *p;
4726         uint32_t i;
4727 
4728         p = xdr_inline_decode(xdr, 4);
4729         if (unlikely(!p))
4730                 return -EIO;
4731         fsinfo->nlayouttypes = be32_to_cpup(p);
4732 
4733         /* pNFS is not supported by the underlying file system */
4734         if (fsinfo->nlayouttypes == 0)
4735                 return 0;
4736 
4737         /* Decode and set first layout type, move xdr->p past unused types */
4738         p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
4739         if (unlikely(!p))
4740                 return -EIO;
4741 
4742         /* If we get too many, then just cap it at the max */
4743         if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
4744                 printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
4745                         __func__, fsinfo->nlayouttypes);
4746                 fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
4747         }
4748 
4749         for(i = 0; i < fsinfo->nlayouttypes; ++i)
4750                 fsinfo->layouttype[i] = be32_to_cpup(p++);
4751         return 0;
4752 }
4753 
4754 /*
4755  * The type of file system exported.
4756  * Note we must ensure that layouttype is set in any non-error case.
4757  */
4758 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4759                                 struct nfs_fsinfo *fsinfo)
4760 {
4761         int status = 0;
4762 
4763         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4764         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4765                 return -EIO;
4766         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4767                 status = decode_pnfs_layout_types(xdr, fsinfo);
4768                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4769         }
4770         return status;
4771 }
4772 
4773 /*
4774  * The prefered block size for layout directed io
4775  */
4776 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4777                                       uint32_t *res)
4778 {
4779         __be32 *p;
4780 
4781         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4782         *res = 0;
4783         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4784                 p = xdr_inline_decode(xdr, 4);
4785                 if (unlikely(!p))
4786                         return -EIO;
4787                 *res = be32_to_cpup(p);
4788                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4789         }
4790         return 0;
4791 }
4792 
4793 /*
4794  * The granularity of a CLONE operation.
4795  */
4796 static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4797                                      uint32_t *res)
4798 {
4799         __be32 *p;
4800 
4801         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4802         *res = 0;
4803         if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
4804                 p = xdr_inline_decode(xdr, 4);
4805                 if (unlikely(!p))
4806                         return -EIO;
4807                 *res = be32_to_cpup(p);
4808                 bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
4809         }
4810         return 0;
4811 }
4812 
4813 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4814 {
4815         unsigned int savep;
4816         uint32_t attrlen, bitmap[3];
4817         int status;
4818 
4819         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4820                 goto xdr_error;
4821         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4822                 goto xdr_error;
4823         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4824                 goto xdr_error;
4825 
4826         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4827 
4828         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4829                 goto xdr_error;
4830         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4831                 goto xdr_error;
4832         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4833                 goto xdr_error;
4834         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4835         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4836                 goto xdr_error;
4837         fsinfo->wtpref = fsinfo->wtmax;
4838 
4839         status = -EIO;
4840         if (unlikely(bitmap[0]))
4841                 goto xdr_error;
4842 
4843         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4844         if (status != 0)
4845                 goto xdr_error;
4846         status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
4847         if (status != 0)
4848                 goto xdr_error;
4849 
4850         status = -EIO;
4851         if (unlikely(bitmap[1]))
4852                 goto xdr_error;
4853 
4854         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4855         if (status)
4856                 goto xdr_error;
4857         status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
4858         if (status)
4859                 goto xdr_error;
4860 
4861         status = verify_attr_len(xdr, savep, attrlen);
4862 xdr_error:
4863         dprintk("%s: xdr returned %d!\n", __func__, -status);
4864         return status;
4865 }
4866 
4867 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4868 {
4869         __be32 *p;
4870         uint32_t len;
4871         int status;
4872 
4873         /* Zero handle first to allow comparisons */
4874         memset(fh, 0, sizeof(*fh));
4875 
4876         status = decode_op_hdr(xdr, OP_GETFH);
4877         if (status)
4878                 return status;
4879 
4880         p = xdr_inline_decode(xdr, 4);
4881         if (unlikely(!p))
4882                 return -EIO;
4883         len = be32_to_cpup(p);
4884         if (len > NFS4_FHSIZE)
4885                 return -EIO;
4886         fh->size = len;
4887         p = xdr_inline_decode(xdr, len);
4888         if (unlikely(!p))
4889                 return -EIO;
4890         memcpy(fh->data, p, len);
4891         return 0;
4892 }
4893 
4894 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4895 {
4896         int status;
4897 
4898         status = decode_op_hdr(xdr, OP_LINK);
4899         if (status)
4900                 return status;
4901         return decode_change_info(xdr, cinfo);
4902 }
4903 
4904 /*
4905  * We create the owner, so we know a proper owner.id length is 4.
4906  */
4907 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4908 {
4909         uint64_t offset, length, clientid;
4910         __be32 *p;
4911         uint32_t namelen, type;
4912 
4913         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4914         if (unlikely(!p))
4915                 return -EIO;
4916         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4917         p = xdr_decode_hyper(p, &length);
4918         type = be32_to_cpup(p++); /* 4 byte read */
4919         if (fl != NULL) { /* manipulate file lock */
4920                 fl->fl_start = (loff_t)offset;
4921                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4922                 if (length == ~(uint64_t)0)
4923                         fl->fl_end = OFFSET_MAX;
4924                 fl->fl_type = F_WRLCK;
4925                 if (type & 1)
4926                         fl->fl_type = F_RDLCK;
4927                 fl->fl_pid = 0;
4928         }
4929         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4930         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4931         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4932         if (likely(!p))
4933                 return -EIO;
4934         return -NFS4ERR_DENIED;
4935 }
4936 
4937 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4938 {
4939         int status;
4940 
4941         status = decode_op_hdr(xdr, OP_LOCK);
4942         if (status == -EIO)
4943                 goto out;
4944         if (status == 0) {
4945                 status = decode_lock_stateid(xdr, &res->stateid);
4946                 if (unlikely(status))
4947                         goto out;
4948         } else if (status == -NFS4ERR_DENIED)
4949                 status = decode_lock_denied(xdr, NULL);
4950         if (res->open_seqid != NULL)
4951                 nfs_increment_open_seqid(status, res->open_seqid);
4952         nfs_increment_lock_seqid(status, res->lock_seqid);
4953 out:
4954         return status;
4955 }
4956 
4957 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4958 {
4959         int status;
4960         status = decode_op_hdr(xdr, OP_LOCKT);
4961         if (status == -NFS4ERR_DENIED)
4962                 return decode_lock_denied(xdr, res->denied);
4963         return status;
4964 }
4965 
4966 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4967 {
4968         int status;
4969 
4970         status = decode_op_hdr(xdr, OP_LOCKU);
4971         if (status != -EIO)
4972                 nfs_increment_lock_seqid(status, res->seqid);
4973         if (status == 0)
4974                 status = decode_lock_stateid(xdr, &res->stateid);
4975         return status;
4976 }
4977 
4978 static int decode_release_lockowner(struct xdr_stream *xdr)
4979 {
4980         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4981 }
4982 
4983 static int decode_lookup(struct xdr_stream *xdr)
4984 {
4985         return decode_op_hdr(xdr, OP_LOOKUP);
4986 }
4987 
4988 static int decode_lookupp(struct xdr_stream *xdr)
4989 {
4990         return decode_op_hdr(xdr, OP_LOOKUPP);
4991 }
4992 
4993 /* This is too sick! */
4994 static int decode_space_limit(struct xdr_stream *xdr,
4995                 unsigned long *pagemod_limit)
4996 {
4997         __be32 *p;
4998         uint32_t limit_type, nblocks, blocksize;
4999         u64 maxsize = 0;
5000 
5001         p = xdr_inline_decode(xdr, 12);
5002         if (unlikely(!p))
5003                 return -EIO;
5004         limit_type = be32_to_cpup(p++);
5005         switch (limit_type) {
5006         case NFS4_LIMIT_SIZE:
5007                 xdr_decode_hyper(p, &maxsize);
5008                 break;
5009         case NFS4_LIMIT_BLOCKS:
5010                 nblocks = be32_to_cpup(p++);
5011                 blocksize = be32_to_cpup(p);
5012                 maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
5013         }
5014         maxsize >>= PAGE_SHIFT;
5015         *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
5016         return 0;
5017 }
5018 
5019 static int decode_rw_delegation(struct xdr_stream *xdr,
5020                 uint32_t delegation_type,
5021                 struct nfs_openres *res)
5022 {
5023         __be32 *p;
5024         int status;
5025 
5026         status = decode_delegation_stateid(xdr, &res->delegation);
5027         if (unlikely(status))
5028                 return status;
5029         p = xdr_inline_decode(xdr, 4);
5030         if (unlikely(!p))
5031                 return -EIO;
5032         res->do_recall = be32_to_cpup(p);
5033 
5034         switch (delegation_type) {
5035         case NFS4_OPEN_DELEGATE_READ:
5036                 res->delegation_type = FMODE_READ;
5037                 break;
5038         case NFS4_OPEN_DELEGATE_WRITE:
5039                 res->delegation_type = FMODE_WRITE|FMODE_READ;
5040                 if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
5041                                 return -EIO;
5042         }
5043         return decode_ace(xdr, NULL);
5044 }
5045 
5046 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5047 {
5048         __be32 *p;
5049         uint32_t why_no_delegation;
5050 
5051         p = xdr_inline_decode(xdr, 4);
5052         if (unlikely(!p))
5053                 return -EIO;
5054         why_no_delegation = be32_to_cpup(p);
5055         switch (why_no_delegation) {
5056                 case WND4_CONTENTION:
5057                 case WND4_RESOURCE:
5058                         xdr_inline_decode(xdr, 4);
5059                         /* Ignore for now */
5060         }
5061         return 0;
5062 }
5063 
5064 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5065 {
5066         __be32 *p;
5067         uint32_t delegation_type;
5068 
5069         p = xdr_inline_decode(xdr, 4);
5070         if (unlikely(!p))
5071                 return -EIO;
5072         delegation_type = be32_to_cpup(p);
5073         res->delegation_type = 0;
5074         switch (delegation_type) {
5075         case NFS4_OPEN_DELEGATE_NONE:
5076                 return 0;
5077         case NFS4_OPEN_DELEGATE_READ:
5078         case NFS4_OPEN_DELEGATE_WRITE:
5079                 return decode_rw_delegation(xdr, delegation_type, res);
5080         case NFS4_OPEN_DELEGATE_NONE_EXT:
5081                 return decode_no_delegation(xdr, res);
5082         }
5083         return -EIO;
5084 }
5085 
5086 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5087 {
5088         __be32 *p;
5089         uint32_t savewords, bmlen, i;
5090         int status;
5091 
5092         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5093                 return status;
5094         nfs_increment_open_seqid(status, res->seqid);
5095         if (status)
5096                 return status;
5097         status = decode_open_stateid(xdr, &res->stateid);
5098         if (unlikely(status))
5099                 return status;
5100 
5101         decode_change_info(xdr, &res->cinfo);
5102 
5103         p = xdr_inline_decode(xdr, 8);
5104         if (unlikely(!p))
5105                 return -EIO;
5106         res->rflags = be32_to_cpup(p++);
5107         bmlen = be32_to_cpup(p);
5108         if (bmlen > 10)
5109                 goto xdr_error;
5110 
5111         p = xdr_inline_decode(xdr, bmlen << 2);
5112         if (unlikely(!p))
5113                 return -EIO;
5114         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5115         for (i = 0; i < savewords; ++i)
5116                 res->attrset[i] = be32_to_cpup(p++);
5117         for (; i < NFS4_BITMAP_SIZE; i++)
5118                 res->attrset[i] = 0;
5119 
5120         return decode_delegation(xdr, res);
5121 xdr_error:
5122         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5123         return -EIO;
5124 }
5125 
5126 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5127 {
5128         int status;
5129 
5130         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5131         if (status != -EIO)
5132                 nfs_increment_open_seqid(status, res->seqid);
5133         if (!status)
5134                 status = decode_open_stateid(xdr, &res->stateid);
5135         return status;
5136 }
5137 
5138 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5139 {
5140         int status;
5141 
5142         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5143         if (status != -EIO)
5144                 nfs_increment_open_seqid(status, res->seqid);
5145         if (!status)
5146                 status = decode_open_stateid(xdr, &res->stateid);
5147         return status;
5148 }
5149 
5150 static int decode_putfh(struct xdr_stream *xdr)
5151 {
5152         return decode_op_hdr(xdr, OP_PUTFH);
5153 }
5154 
5155 static int decode_putrootfh(struct xdr_stream *xdr)
5156 {
5157         return decode_op_hdr(xdr, OP_PUTROOTFH);
5158 }
5159 
5160 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5161                        struct nfs_pgio_res *res)
5162 {
5163         __be32 *p;
5164         uint32_t count, eof, recvd;
5165         int status;
5166 
5167         status = decode_op_hdr(xdr, OP_READ);
5168         if (status)
5169                 return status;
5170         p = xdr_inline_decode(xdr, 8);
5171         if (unlikely(!p))
5172                 return -EIO;
5173         eof = be32_to_cpup(p++);
5174         count = be32_to_cpup(p);
5175         recvd = xdr_read_pages(xdr, count);
5176         if (count > recvd) {
5177                 dprintk("NFS: server cheating in read reply: "
5178                                 "count %u > recvd %u\n", count, recvd);
5179                 count = recvd;
5180                 eof = 0;
5181         }
5182         res->eof = eof;
5183         res->count = count;
5184         return 0;
5185 }
5186 
5187 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5188 {
5189         int             status;
5190         __be32          verf[2];
5191 
5192         status = decode_op_hdr(xdr, OP_READDIR);
5193         if (!status)
5194                 status = decode_verifier(xdr, readdir->verifier.data);
5195         if (unlikely(status))
5196                 return status;
5197         memcpy(verf, readdir->verifier.data, sizeof(verf));
5198         dprintk("%s: verifier = %08x:%08x\n",
5199                         __func__, verf[0], verf[1]);
5200         return xdr_read_pages(xdr, xdr->buf->page_len);
5201 }
5202 
5203 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5204 {
5205         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5206         u32 len, recvd;
5207         __be32 *p;
5208         int status;
5209 
5210         status = decode_op_hdr(xdr, OP_READLINK);
5211         if (status)
5212                 return status;
5213 
5214         /* Convert length of symlink */
5215         p = xdr_inline_decode(xdr, 4);
5216         if (unlikely(!p))
5217                 return -EIO;
5218         len = be32_to_cpup(p);
5219         if (len >= rcvbuf->page_len || len <= 0) {
5220                 dprintk("nfs: server returned giant symlink!\n");
5221                 return -ENAMETOOLONG;
5222         }
5223         recvd = xdr_read_pages(xdr, len);
5224         if (recvd < len) {
5225                 dprintk("NFS: server cheating in readlink reply: "
5226                                 "count %u > recvd %u\n", len, recvd);
5227                 return -EIO;
5228         }
5229         /*
5230          * The XDR encode routine has set things up so that
5231          * the link text will be copied directly into the
5232          * buffer.  We just have to do overflow-checking,
5233          * and and null-terminate the text (the VFS expects
5234          * null-termination).
5235          */
5236         xdr_terminate_string(rcvbuf, len);
5237         return 0;
5238 }
5239 
5240 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5241 {
5242         int status;
5243 
5244         status = decode_op_hdr(xdr, OP_REMOVE);
5245         if (status)
5246                 goto out;
5247         status = decode_change_info(xdr, cinfo);
5248 out:
5249         return status;
5250 }
5251 
5252 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5253               struct nfs4_change_info *new_cinfo)
5254 {
5255         int status;
5256 
5257         status = decode_op_hdr(xdr, OP_RENAME);
5258         if (status)
5259                 goto out;
5260         if ((status = decode_change_info(xdr, old_cinfo)))
5261                 goto out;
5262         status = decode_change_info(xdr, new_cinfo);
5263 out:
5264         return status;
5265 }
5266 
5267 static int decode_renew(struct xdr_stream *xdr)
5268 {
5269         return decode_op_hdr(xdr, OP_RENEW);
5270 }
5271 
5272 static int
5273 decode_restorefh(struct xdr_stream *xdr)
5274 {
5275         return decode_op_hdr(xdr, OP_RESTOREFH);
5276 }
5277 
5278 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5279                          struct nfs_getaclres *res)
5280 {
5281         unsigned int savep;
5282         uint32_t attrlen,
5283                  bitmap[3] = {0};
5284         int status;
5285         unsigned int pg_offset;
5286 
5287         res->acl_len = 0;
5288         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5289                 goto out;
5290 
5291         xdr_enter_page(xdr, xdr->buf->page_len);
5292 
5293         /* Calculate the offset of the page data */
5294         pg_offset = xdr->buf->head[0].iov_len;
5295 
5296         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5297                 goto out;
5298         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5299                 goto out;
5300 
5301         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5302                 return -EIO;
5303         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5304 
5305                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5306                  * are stored with the acl data to handle the problem of
5307                  * variable length bitmaps.*/
5308                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5309                 res->acl_len = attrlen;
5310 
5311                 /* Check for receive buffer overflow */
5312                 if (res->acl_len > (xdr->nwords << 2) ||
5313                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5314                         res->acl_flags |= NFS4_ACL_TRUNC;
5315                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5316                                         attrlen, xdr->nwords << 2);
5317                 }
5318         } else
5319                 status = -EOPNOTSUPP;
5320 
5321 out:
5322         return status;
5323 }
5324 
5325 static int
5326 decode_savefh(struct xdr_stream *xdr)
5327 {
5328         return decode_op_hdr(xdr, OP_SAVEFH);
5329 }
5330 
5331 static int decode_setattr(struct xdr_stream *xdr)
5332 {
5333         int status;
5334 
5335         status = decode_op_hdr(xdr, OP_SETATTR);
5336         if (status)
5337                 return status;
5338         if (decode_bitmap4(xdr, NULL, 0) >= 0)
5339                 return 0;
5340         return -EIO;
5341 }
5342 
5343 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5344 {
5345         __be32 *p;
5346         uint32_t opnum;
5347         int32_t nfserr;
5348 
5349         p = xdr_inline_decode(xdr, 8);
5350         if (unlikely(!p))
5351                 return -EIO;
5352         opnum = be32_to_cpup(p++);
5353         if (opnum != OP_SETCLIENTID) {
5354                 dprintk("nfs: decode_setclientid: Server returned operation"
5355                         " %d\n", opnum);
5356                 return -EIO;
5357         }
5358         nfserr = be32_to_cpup(p);
5359         if (nfserr == NFS_OK) {
5360                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5361                 if (unlikely(!p))
5362                         return -EIO;
5363                 p = xdr_decode_hyper(p, &res->clientid);
5364                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5365         } else if (nfserr == NFSERR_CLID_INUSE) {
5366                 uint32_t len;
5367 
5368                 /* skip netid string */
5369                 p = xdr_inline_decode(xdr, 4);
5370                 if (unlikely(!p))
5371                         return -EIO;
5372                 len = be32_to_cpup(p);
5373                 p = xdr_inline_decode(xdr, len);
5374                 if (unlikely(!p))
5375                         return -EIO;
5376 
5377                 /* skip uaddr string */
5378                 p = xdr_inline_decode(xdr, 4);
5379                 if (unlikely(!p))
5380                         return -EIO;
5381                 len = be32_to_cpup(p);
5382                 p = xdr_inline_decode(xdr, len);
5383                 if (unlikely(!p))
5384                         return -EIO;
5385                 return -NFSERR_CLID_INUSE;
5386         } else
5387                 return nfs4_stat_to_errno(nfserr);
5388 
5389         return 0;
5390 }
5391 
5392 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5393 {
5394         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5395 }
5396 
5397 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5398 {
5399         __be32 *p;
5400         int status;
5401 
5402         status = decode_op_hdr(xdr, OP_WRITE);
5403         if (status)
5404                 return status;
5405 
5406         p = xdr_inline_decode(xdr, 8);
5407         if (unlikely(!p))
5408                 return -EIO;
5409         res->count = be32_to_cpup(p++);
5410         res->verf->committed = be32_to_cpup(p++);
5411         return decode_write_verifier(xdr, &res->verf->verifier);
5412 }
5413 
5414 static int decode_delegreturn(struct xdr_stream *xdr)
5415 {
5416         return decode_op_hdr(xdr, OP_DELEGRETURN);
5417 }
5418 
5419 static int decode_secinfo_gss(struct xdr_stream *xdr,
5420                               struct nfs4_secinfo4 *flavor)
5421 {
5422         u32 oid_len;
5423         __be32 *p;
5424 
5425         p = xdr_inline_decode(xdr, 4);
5426         if (unlikely(!p))
5427                 return -EIO;
5428         oid_len = be32_to_cpup(p);
5429         if (oid_len > GSS_OID_MAX_LEN)
5430                 return -EINVAL;
5431 
5432         p = xdr_inline_decode(xdr, oid_len);
5433         if (unlikely(!p))
5434                 return -EIO;
5435         memcpy(flavor->flavor_info.oid.data, p, oid_len);
5436         flavor->flavor_info.oid.len = oid_len;
5437 
5438         p = xdr_inline_decode(xdr, 8);
5439         if (unlikely(!p))
5440                 return -EIO;
5441         flavor->flavor_info.qop = be32_to_cpup(p++);
5442         flavor->flavor_info.service = be32_to_cpup(p);
5443 
5444         return 0;
5445 }
5446 
5447 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5448 {
5449         struct nfs4_secinfo4 *sec_flavor;
5450         unsigned int i, num_flavors;
5451         int status;
5452         __be32 *p;
5453 
5454         p = xdr_inline_decode(xdr, 4);
5455         if (unlikely(!p))
5456                 return -EIO;
5457 
5458         res->flavors->num_flavors = 0;
5459         num_flavors = be32_to_cpup(p);
5460 
5461         for (i = 0; i < num_flavors; i++) {
5462                 sec_flavor = &res->flavors->flavors[i];
5463                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5464                         break;
5465 
5466                 p = xdr_inline_decode(xdr, 4);
5467                 if (unlikely(!p))
5468                         return -EIO;
5469                 sec_flavor->flavor = be32_to_cpup(p);
5470 
5471                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5472                         status = decode_secinfo_gss(xdr, sec_flavor);
5473                         if (status)
5474                                 goto out;
5475                 }
5476                 res->flavors->num_flavors++;
5477         }
5478 
5479         status = 0;
5480 out:
5481         return status;
5482 }
5483 
5484 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5485 {
5486         int status = decode_op_hdr(xdr, OP_SECINFO);
5487         if (status)
5488                 return status;
5489         return decode_secinfo_common(xdr, res);
5490 }
5491 
5492 #if defined(CONFIG_NFS_V4_1)
5493 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5494 {
5495         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5496         if (status)
5497                 return status;
5498         return decode_secinfo_common(xdr, res);
5499 }
5500 
5501 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5502 {
5503         __be32 *p;
5504         uint32_t bitmap_words;
5505         unsigned int i;
5506 
5507         p = xdr_inline_decode(xdr, 4);
5508         if (!p)
5509                 return -EIO;
5510         bitmap_words = be32_to_cpup(p++);
5511         if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5512                 return -EIO;
5513         p = xdr_inline_decode(xdr, 4 * bitmap_words);
5514         for (i = 0; i < bitmap_words; i++)
5515                 op_map->u.words[i] = be32_to_cpup(p++);
5516 
5517         return 0;
5518 }
5519 
5520 static int decode_exchange_id(struct xdr_stream *xdr,
5521                               struct nfs41_exchange_id_res *res)
5522 {
5523         __be32 *p;
5524         uint32_t dummy;
5525         char *dummy_str;
5526         int status;
5527         uint32_t impl_id_count;
5528 
5529         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5530         if (status)
5531                 return status;
5532 
5533         p = xdr_inline_decode(xdr, 8);
5534         if (unlikely(!p))
5535                 return -EIO;
5536         xdr_decode_hyper(p, &res->clientid);
5537         p = xdr_inline_decode(xdr, 12);
5538         if (unlikely(!p))
5539                 return -EIO;
5540         res->seqid = be32_to_cpup(p++);
5541         res->flags = be32_to_cpup(p++);
5542 
5543         res->state_protect.how = be32_to_cpup(p);
5544         switch (res->state_protect.how) {
5545         case SP4_NONE:
5546                 break;
5547         case SP4_MACH_CRED:
5548                 status = decode_op_map(xdr, &res->state_protect.enforce);
5549                 if (status)
5550                         return status;
5551                 status = decode_op_map(xdr, &res->state_protect.allow);
5552                 if (status)
5553                         return status;
5554                 break;
5555         default:
5556                 WARN_ON_ONCE(1);
5557                 return -EIO;
5558         }
5559 
5560         /* server_owner4.so_minor_id */
5561         p = xdr_inline_decode(xdr, 8);
5562         if (unlikely(!p))
5563                 return -EIO;
5564         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5565 
5566         /* server_owner4.so_major_id */
5567         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5568         if (unlikely(status))
5569                 return status;
5570         memcpy(res->server_owner->major_id, dummy_str, dummy);
5571         res->server_owner->major_id_sz = dummy;
5572 
5573         /* server_scope4 */
5574         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5575         if (unlikely(status))
5576                 return status;
5577         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5578         res->server_scope->server_scope_sz = dummy;
5579 
5580         /* Implementation Id */
5581         p = xdr_inline_decode(xdr, 4);
5582         if (unlikely(!p))
5583                 return -EIO;
5584         impl_id_count = be32_to_cpup(p++);
5585 
5586         if (impl_id_count) {
5587                 /* nii_domain */
5588                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5589                 if (unlikely(status))
5590                         return status;
5591                 memcpy(res->impl_id->domain, dummy_str, dummy);
5592 
5593                 /* nii_name */
5594                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5595                 if (unlikely(status))
5596                         return status;
5597                 memcpy(res->impl_id->name, dummy_str, dummy);
5598 
5599                 /* nii_date */
5600                 p = xdr_inline_decode(xdr, 12);
5601                 if (unlikely(!p))
5602                         return -EIO;
5603                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5604                 res->impl_id->date.nseconds = be32_to_cpup(p);
5605 
5606                 /* if there's more than one entry, ignore the rest */
5607         }
5608         return 0;
5609 }
5610 
5611 static int decode_chan_attrs(struct xdr_stream *xdr,
5612                              struct nfs4_channel_attrs *attrs)
5613 {
5614         __be32 *p;
5615         u32 nr_attrs, val;
5616 
5617         p = xdr_inline_decode(xdr, 28);
5618         if (unlikely(!p))
5619                 return -EIO;
5620         val = be32_to_cpup(p++);        /* headerpadsz */
5621         if (val)
5622                 return -EINVAL;         /* no support for header padding yet */
5623         attrs->max_rqst_sz = be32_to_cpup(p++);
5624         attrs->max_resp_sz = be32_to_cpup(p++);
5625         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5626         attrs->max_ops = be32_to_cpup(p++);
5627         attrs->max_reqs = be32_to_cpup(p++);
5628         nr_attrs = be32_to_cpup(p);
5629         if (unlikely(nr_attrs > 1)) {
5630                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5631                         "count %u\n", __func__, nr_attrs);
5632                 return -EINVAL;
5633         }
5634         if (nr_attrs == 1) {
5635                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5636                 if (unlikely(!p))
5637                         return -EIO;
5638         }
5639         return 0;
5640 }
5641 
5642 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5643 {
5644         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5645 }
5646 
5647 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5648                                 struct nfs41_bind_conn_to_session_res *res)
5649 {
5650         __be32 *p;
5651         int status;
5652 
5653         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5654         if (!status)
5655                 status = decode_sessionid(xdr, &res->sessionid);
5656         if (unlikely(status))
5657                 return status;
5658 
5659         /* dir flags, rdma mode bool */
5660         p = xdr_inline_decode(xdr, 8);
5661         if (unlikely(!p))
5662                 return -EIO;
5663 
5664         res->dir = be32_to_cpup(p++);
5665         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5666                 return -EIO;
5667         if (be32_to_cpup(p) == 0)
5668                 res->use_conn_in_rdma_mode = false;
5669         else
5670                 res->use_conn_in_rdma_mode = true;
5671 
5672         return 0;
5673 }
5674 
5675 static int decode_create_session(struct xdr_stream *xdr,
5676                                  struct nfs41_create_session_res *res)
5677 {
5678         __be32 *p;
5679         int status;
5680 
5681         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5682         if (!status)
5683                 status = decode_sessionid(xdr, &res->sessionid);
5684         if (unlikely(status))
5685                 return status;
5686 
5687         /* seqid, flags */
5688         p = xdr_inline_decode(xdr, 8);
5689         if (unlikely(!p))
5690                 return -EIO;
5691         res->seqid = be32_to_cpup(p++);
5692         res->flags = be32_to_cpup(p);
5693 
5694         /* Channel attributes */
5695         status = decode_chan_attrs(xdr, &res->fc_attrs);
5696         if (!status)
5697                 status = decode_chan_attrs(xdr, &res->bc_attrs);
5698         return status;
5699 }
5700 
5701 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5702 {
5703         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5704 }
5705 
5706 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5707 {
5708         return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5709 }
5710 
5711 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5712 {
5713         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5714 }
5715 #endif /* CONFIG_NFS_V4_1 */
5716 
5717 static int decode_sequence(struct xdr_stream *xdr,
5718                            struct nfs4_sequence_res *res,
5719                            struct rpc_rqst *rqstp)
5720 {
5721 #if defined(CONFIG_NFS_V4_1)
5722         struct nfs4_session *session;
5723         struct nfs4_sessionid id;
5724         u32 dummy;
5725         int status;
5726         __be32 *p;
5727 
5728         if (res->sr_slot == NULL)
5729                 return 0;
5730         if (!res->sr_slot->table->session)
5731                 return 0;
5732 
5733         status = decode_op_hdr(xdr, OP_SEQUENCE);
5734         if (!status)
5735                 status = decode_sessionid(xdr, &id);
5736         if (unlikely(status))
5737                 goto out_err;
5738 
5739         /*
5740          * If the server returns different values for sessionID, slotID or
5741          * sequence number, the server is looney tunes.
5742          */
5743         status = -EREMOTEIO;
5744         session = res->sr_slot->table->session;
5745 
5746         if (memcmp(id.data, session->sess_id.data,
5747                    NFS4_MAX_SESSIONID_LEN)) {
5748                 dprintk("%s Invalid session id\n", __func__);
5749                 goto out_err;
5750         }
5751 
5752         p = xdr_inline_decode(xdr, 20);
5753         if (unlikely(!p))
5754                 goto out_overflow;
5755 
5756         /* seqid */
5757         dummy = be32_to_cpup(p++);
5758         if (dummy != res->sr_slot->seq_nr) {
5759                 dprintk("%s Invalid sequence number\n", __func__);
5760                 goto out_err;
5761         }
5762         /* slot id */
5763         dummy = be32_to_cpup(p++);
5764         if (dummy != res->sr_slot->slot_nr) {
5765                 dprintk("%s Invalid slot id\n", __func__);
5766                 goto out_err;
5767         }
5768         /* highest slot id */
5769         res->sr_highest_slotid = be32_to_cpup(p++);
5770         /* target highest slot id */
5771         res->sr_target_highest_slotid = be32_to_cpup(p++);
5772         /* result flags */
5773         res->sr_status_flags = be32_to_cpup(p);
5774         status = 0;
5775 out_err:
5776         res->sr_status = status;
5777         return status;
5778 out_overflow:
5779         status = -EIO;
5780         goto out_err;
5781 #else  /* CONFIG_NFS_V4_1 */
5782         return 0;
5783 #endif /* CONFIG_NFS_V4_1 */
5784 }
5785 
5786 #if defined(CONFIG_NFS_V4_1)
5787 static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
5788 {
5789         stateid->type = NFS4_LAYOUT_STATEID_TYPE;
5790         return decode_stateid(xdr, stateid);
5791 }
5792 
5793 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5794                                 struct nfs4_getdeviceinfo_res *res)
5795 {
5796         struct pnfs_device *pdev = res->pdev;
5797         __be32 *p;
5798         uint32_t len, type;
5799         int status;
5800 
5801         status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5802         if (status) {
5803                 if (status == -ETOOSMALL) {
5804                         p = xdr_inline_decode(xdr, 4);
5805                         if (unlikely(!p))
5806                                 return -EIO;
5807                         pdev->mincount = be32_to_cpup(p);
5808                         dprintk("%s: Min count too small. mincnt = %u\n",
5809                                 __func__, pdev->mincount);
5810                 }
5811                 return status;
5812         }
5813 
5814         p = xdr_inline_decode(xdr, 8);
5815         if (unlikely(!p))
5816                 return -EIO;
5817         type = be32_to_cpup(p++);
5818         if (type != pdev->layout_type) {
5819                 dprintk("%s: layout mismatch req: %u pdev: %u\n",
5820                         __func__, pdev->layout_type, type);
5821                 return -EINVAL;
5822         }
5823         /*
5824          * Get the length of the opaque device_addr4. xdr_read_pages places
5825          * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5826          * and places the remaining xdr data in xdr_buf->tail
5827          */
5828         pdev->mincount = be32_to_cpup(p);
5829         if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
5830                 return -EIO;
5831 
5832         /* Parse notification bitmap, verifying that it is zero. */
5833         p = xdr_inline_decode(xdr, 4);
5834         if (unlikely(!p))
5835                 return -EIO;
5836         len = be32_to_cpup(p);
5837         if (len) {
5838                 uint32_t i;
5839 
5840                 p = xdr_inline_decode(xdr, 4 * len);
5841                 if (unlikely(!p))
5842                         return -EIO;
5843 
5844                 res->notification = be32_to_cpup(p++);
5845                 for (i = 1; i < len; i++) {
5846                         if (be32_to_cpup(p++)) {
5847                                 dprintk("%s: unsupported notification\n",
5848                                         __func__);
5849                                 return -EIO;
5850                         }
5851                 }
5852         }
5853         return 0;
5854 }
5855 
5856 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5857                             struct nfs4_layoutget_res *res)
5858 {
5859         __be32 *p;
5860         int status;
5861         u32 layout_count;
5862         u32 recvd;
5863 
5864         status = decode_op_hdr(xdr, OP_LAYOUTGET);
5865         if (status)
5866                 goto out;
5867         p = xdr_inline_decode(xdr, 4);
5868         if (unlikely(!p))
5869                 goto out_overflow;
5870         res->return_on_close = be32_to_cpup(p);
5871         decode_layout_stateid(xdr, &res->stateid);
5872         p = xdr_inline_decode(xdr, 4);
5873         if (unlikely(!p))
5874                 goto out_overflow;
5875         layout_count = be32_to_cpup(p);
5876         if (!layout_count) {
5877                 dprintk("%s: server responded with empty layout array\n",
5878                         __func__);
5879                 status = -EINVAL;
5880                 goto out;
5881         }
5882 
5883         p = xdr_inline_decode(xdr, 28);
5884         if (unlikely(!p))
5885                 goto out_overflow;
5886         p = xdr_decode_hyper(p, &res->range.offset);
5887         p = xdr_decode_hyper(p, &res->range.length);
5888         res->range.iomode = be32_to_cpup(p++);
5889         res->type = be32_to_cpup(p++);
5890         res->layoutp->len = be32_to_cpup(p);
5891 
5892         dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
5893                 __func__,
5894                 (unsigned long)res->range.offset,
5895                 (unsigned long)res->range.length,
5896                 res->range.iomode,
5897                 res->type,
5898                 res->layoutp->len);
5899 
5900         recvd = xdr_read_pages(xdr, res->layoutp->len);
5901         if (res->layoutp->len > recvd) {
5902                 dprintk("NFS: server cheating in layoutget reply: "
5903                                 "layout len %u > recvd %u\n",
5904                                 res->layoutp->len, recvd);
5905                 status = -EINVAL;
5906                 goto out;
5907         }
5908 
5909         if (layout_count > 1) {
5910                 /* We only handle a length one array at the moment.  Any
5911                  * further entries are just ignored.  Note that this means
5912                  * the client may see a response that is less than the
5913                  * minimum it requested.
5914                  */
5915                 dprintk("%s: server responded with %d layouts, dropping tail\n",
5916                         __func__, layout_count);
5917         }
5918 
5919 out:
5920         res->status = status;
5921         return status;
5922 out_overflow:
5923         status = -EIO;
5924         goto out;
5925 }
5926 
5927 static int decode_layoutreturn(struct xdr_stream *xdr,
5928                                struct nfs4_layoutreturn_res *res)
5929 {
5930         __be32 *p;
5931         int status;
5932 
5933         status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
5934         if (status)
5935                 return status;
5936         p = xdr_inline_decode(xdr, 4);
5937         if (unlikely(!p))
5938                 return -EIO;
5939         res->lrs_present = be32_to_cpup(p);
5940         if (res->lrs_present)
5941                 status = decode_layout_stateid(xdr, &res->stateid);
5942         else
5943                 nfs4_stateid_copy(&res->stateid, &invalid_stateid);
5944         return status;
5945 }
5946 
5947 static int decode_layoutcommit(struct xdr_stream *xdr,
5948                                struct rpc_rqst *req,
5949                                struct nfs4_layoutcommit_res *res)
5950 {
5951         __be32 *p;
5952         __u32 sizechanged;
5953         int status;
5954 
5955         status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
5956         res->status = status;
5957         if (status)
5958                 return status;
5959 
5960         p = xdr_inline_decode(xdr, 4);
5961         if (unlikely(!p))
5962                 return -EIO;
5963         sizechanged = be32_to_cpup(p);
5964 
5965         if (sizechanged) {
5966                 /* throw away new size */
5967                 p = xdr_inline_decode(xdr, 8);
5968                 if (unlikely(!p))
5969                         return -EIO;
5970         }
5971         return 0;
5972 }
5973 
5974 static int decode_test_stateid(struct xdr_stream *xdr,
5975                                struct nfs41_test_stateid_res *res)
5976 {
5977         __be32 *p;
5978         int status;
5979         int num_res;
5980 
5981         status = decode_op_hdr(xdr, OP_TEST_STATEID);
5982         if (status)
5983                 return status;
5984 
5985         p = xdr_inline_decode(xdr, 4);
5986         if (unlikely(!p))
5987                 return -EIO;
5988         num_res = be32_to_cpup(p++);
5989         if (num_res != 1)
5990                 return -EIO;
5991 
5992         p = xdr_inline_decode(xdr, 4);
5993         if (unlikely(!p))
5994                 return -EIO;
5995         res->status = be32_to_cpup(p++);
5996 
5997         return status;
5998 }
5999 
6000 static int decode_free_stateid(struct xdr_stream *xdr,
6001                                struct nfs41_free_stateid_res *res)
6002 {
6003         res->status = decode_op_hdr(xdr, OP_FREE_STATEID);
6004         return res->status;
6005 }
6006 #else
6007 static inline
6008 int decode_layoutreturn(struct xdr_stream *xdr,
6009                                struct nfs4_layoutreturn_res *res)
6010 {
6011         return 0;
6012 }
6013 
6014 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
6015                             struct nfs4_layoutget_res *res)
6016 {
6017         return 0;
6018 }
6019 
6020 #endif /* CONFIG_NFS_V4_1 */
6021 
6022 /*
6023  * END OF "GENERIC" DECODE ROUTINES.
6024  */
6025 
6026 /*
6027  * Decode OPEN_DOWNGRADE response
6028  */
6029 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
6030                                        struct xdr_stream *xdr,
6031                                        void *data)
6032 {
6033         struct nfs_closeres *res = data;
6034         struct compound_hdr hdr;
6035         int status;
6036 
6037         status = decode_compound_hdr(xdr, &hdr);
6038         if (status)
6039                 goto out;
6040         status = decode_sequence(xdr, &res->seq_res, rqstp);
6041         if (status)
6042                 goto out;
6043         status = decode_putfh(xdr);
6044         if (status)
6045                 goto out;
6046         if (res->lr_res) {
6047                 status = decode_layoutreturn(xdr, res->lr_res);
6048                 res->lr_ret = status;
6049                 if (status)
6050                         goto out;
6051         }
6052         status = decode_open_downgrade(xdr, res);
6053 out:
6054         return status;
6055 }
6056 
6057 /*
6058  * Decode ACCESS response
6059  */
6060 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6061                                void *data)
6062 {
6063         struct nfs4_accessres *res = data;
6064         struct compound_hdr hdr;
6065         int status;
6066 
6067         status = decode_compound_hdr(xdr, &hdr);
6068         if (status)
6069                 goto out;
6070         status = decode_sequence(xdr, &res->seq_res, rqstp);
6071         if (status)
6072                 goto out;
6073         status = decode_putfh(xdr);
6074         if (status != 0)
6075                 goto out;
6076         status = decode_access(xdr, &res->supported, &res->access);
6077         if (status != 0)
6078                 goto out;
6079         if (res->fattr)
6080                 decode_getfattr(xdr, res->fattr, res->server);
6081 out:
6082         return status;
6083 }
6084 
6085 /*
6086  * Decode LOOKUP response
6087  */
6088 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6089                                void *data)
6090 {
6091         struct nfs4_lookup_res *res = data;
6092         struct compound_hdr hdr;
6093         int status;
6094 
6095         status = decode_compound_hdr(xdr, &hdr);
6096         if (status)
6097                 goto out;
6098         status = decode_sequence(xdr, &res->seq_res, rqstp);
6099         if (status)
6100                 goto out;
6101         status = decode_putfh(xdr);
6102         if (status)
6103                 goto out;
6104         status = decode_lookup(xdr);
6105         if (status)
6106                 goto out;
6107         status = decode_getfh(xdr, res->fh);
6108         if (status)
6109                 goto out;
6110         status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6111 out:
6112         return status;
6113 }
6114 
6115 /*
6116  * Decode LOOKUPP response
6117  */
6118 static int nfs4_xdr_dec_lookupp(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6119                 void *data)
6120 {
6121         struct nfs4_lookupp_res *res = data;
6122         struct compound_hdr hdr;
6123         int status;
6124 
6125         status = decode_compound_hdr(xdr, &hdr);
6126         if (status)
6127                 goto out;
6128         status = decode_sequence(xdr, &res->seq_res, rqstp);
6129         if (status)
6130                 goto out;
6131         status = decode_putfh(xdr);
6132         if (status)
6133                 goto out;
6134         status = decode_lookupp(xdr);
6135         if (status)
6136                 goto out;
6137         status = decode_getfh(xdr, res->fh);
6138         if (status)
6139                 goto out;
6140         status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6141 out:
6142         return status;
6143 }
6144 
6145 /*
6146  * Decode LOOKUP_ROOT response
6147  */
6148 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
6149                                     struct xdr_stream *xdr,
6150                                     void *data)
6151 {
6152         struct nfs4_lookup_res *res = data;
6153         struct compound_hdr hdr;
6154         int status;
6155 
6156         status = decode_compound_hdr(xdr, &hdr);
6157         if (status)
6158                 goto out;
6159         status = decode_sequence(xdr, &res->seq_res, rqstp);
6160         if (status)
6161                 goto out;
6162         status = decode_putrootfh(xdr);
6163         if (status)
6164                 goto out;
6165         status = decode_getfh(xdr, res->fh);
6166         if (status == 0)
6167                 status = decode_getfattr_label(xdr, res->fattr,
6168                                                 res->label, res->server);
6169 out:
6170         return status;
6171 }
6172 
6173 /*
6174  * Decode REMOVE response
6175  */
6176 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6177                                void *data)
6178 {
6179         struct nfs_removeres *res = data;
6180         struct compound_hdr hdr;
6181         int status;
6182 
6183         status = decode_compound_hdr(xdr, &hdr);
6184         if (status)
6185                 goto out;
6186         status = decode_sequence(xdr, &res->seq_res, rqstp);
6187         if (status)
6188                 goto out;
6189         status = decode_putfh(xdr);
6190         if (status)
6191                 goto out;
6192         status = decode_remove(xdr, &res->cinfo);
6193 out:
6194         return status;
6195 }
6196 
6197 /*
6198  * Decode RENAME response
6199  */
6200 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6201                                void *data)
6202 {
6203         struct nfs_renameres *res = data;
6204         struct compound_hdr hdr;
6205         int status;
6206 
6207         status = decode_compound_hdr(xdr, &hdr);
6208         if (status)
6209                 goto out;
6210         status = decode_sequence(xdr, &res->seq_res, rqstp);
6211         if (status)
6212                 goto out;
6213         status = decode_putfh(xdr);
6214         if (status)
6215                 goto out;
6216         status = decode_savefh(xdr);
6217         if (status)
6218                 goto out;
6219         status = decode_putfh(xdr);
6220         if (status)
6221                 goto out;
6222         status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
6223 out:
6224         return status;
6225 }
6226 
6227 /*
6228  * Decode LINK response
6229  */
6230 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6231                              void *data)
6232 {
6233         struct nfs4_link_res *res = data;
6234         struct compound_hdr hdr;
6235         int status;
6236 
6237         status = decode_compound_hdr(xdr, &hdr);
6238         if (status)
6239                 goto out;
6240         status = decode_sequence(xdr, &res->seq_res, rqstp);
6241         if (status)
6242                 goto out;
6243         status = decode_putfh(xdr);
6244         if (status)
6245                 goto out;
6246         status = decode_savefh(xdr);
6247         if (status)
6248                 goto out;
6249         status = decode_putfh(xdr);
6250         if (status)
6251                 goto out;
6252         status = decode_link(xdr, &res->cinfo);
6253         if (status)
6254                 goto out;
6255         /*
6256          * Note order: OP_LINK leaves the directory as the current
6257          *             filehandle.
6258          */
6259         status = decode_restorefh(xdr);
6260         if (status)
6261                 goto out;
6262         decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6263 out:
6264         return status;
6265 }
6266 
6267 /*
6268  * Decode CREATE response
6269  */
6270 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6271                                void *data)
6272 {
6273         struct nfs4_create_res *res = data;
6274         struct compound_hdr hdr;
6275         int status;
6276 
6277         status = decode_compound_hdr(xdr, &hdr);
6278         if (status)
6279                 goto out;
6280         status = decode_sequence(xdr, &res->seq_res, rqstp);
6281         if (status)
6282                 goto out;
6283         status = decode_putfh(xdr);
6284         if (status)
6285                 goto out;
6286         status = decode_create(xdr, &res->dir_cinfo);
6287         if (status)
6288                 goto out;
6289         status = decode_getfh(xdr, res->fh);
6290         if (status)
6291                 goto out;
6292         decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6293 out:
6294         return status;
6295 }
6296 
6297 /*
6298  * Decode SYMLINK response
6299  */
6300 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6301                                 void *res)
6302 {
6303         return nfs4_xdr_dec_create(rqstp, xdr, res);
6304 }
6305 
6306 /*
6307  * Decode GETATTR response
6308  */
6309 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6310                                 void *data)
6311 {
6312         struct nfs4_getattr_res *res = data;
6313         struct compound_hdr hdr;
6314         int status;
6315 
6316         status = decode_compound_hdr(xdr, &hdr);
6317         if (status)
6318                 goto out;
6319         status = decode_sequence(xdr, &res->seq_res, rqstp);
6320         if (status)
6321                 goto out;
6322         status = decode_putfh(xdr);
6323         if (status)
6324                 goto out;
6325         status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6326 out:
6327         return status;
6328 }
6329 
6330 /*
6331  * Encode an SETACL request
6332  */
6333 static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
6334                                 const void *data)
6335 {
6336         const struct nfs_setaclargs *args = data;
6337         struct compound_hdr hdr = {
6338                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
6339         };
6340 
6341         encode_compound_hdr(xdr, req, &hdr);
6342         encode_sequence(xdr, &args->seq_args, &hdr);
6343         encode_putfh(xdr, args->fh, &hdr);
6344         encode_setacl(xdr, args, &hdr);
6345         encode_nops(&hdr);
6346 }
6347 
6348 /*
6349  * Decode SETACL response
6350  */
6351 static int
6352 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6353                     void *data)
6354 {
6355         struct nfs_setaclres *res = data;
6356         struct compound_hdr hdr;
6357         int status;
6358 
6359         status = decode_compound_hdr(xdr, &hdr);
6360         if (status)
6361                 goto out;
6362         status = decode_sequence(xdr, &res->seq_res, rqstp);
6363         if (status)
6364                 goto out;
6365         status = decode_putfh(xdr);
6366         if (status)
6367                 goto out;
6368         status = decode_setattr(xdr);
6369 out:
6370         return status;
6371 }
6372 
6373 /*
6374  * Decode GETACL response
6375  */
6376 static int
6377 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6378                     void *data)
6379 {
6380         struct nfs_getaclres *res = data;
6381         struct compound_hdr hdr;
6382         int status;
6383 
6384         if (res->acl_scratch != NULL) {
6385                 void *p = page_address(res->acl_scratch);
6386                 xdr_set_scratch_buffer(xdr, p, PAGE_SIZE);
6387         }
6388         status = decode_compound_hdr(xdr, &hdr);
6389         if (status)
6390                 goto out;
6391         status = decode_sequence(xdr, &res->seq_res, rqstp);
6392         if (status)
6393                 goto out;
6394         status = decode_putfh(xdr);
6395         if (status)
6396                 goto out;
6397         status = decode_getacl(xdr, rqstp, res);
6398 
6399 out:
6400         return status;
6401 }
6402 
6403 /*
6404  * Decode CLOSE response
6405  */
6406 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6407                               void *data)
6408 {
6409         struct nfs_closeres *res = data;
6410         struct compound_hdr hdr;
6411         int status;
6412 
6413         status = decode_compound_hdr(xdr, &hdr);
6414         if (status)
6415                 goto out;
6416         status = decode_sequence(xdr, &res->seq_res, rqstp);
6417         if (status)
6418                 goto out;
6419         status = decode_putfh(xdr);
6420         if (status)
6421                 goto out;
6422         if (res->lr_res) {
6423                 status = decode_layoutreturn(xdr, res->lr_res);
6424                 res->lr_ret = status;
6425                 if (status)
6426                         goto out;
6427         }
6428         if (res->fattr != NULL) {
6429                 status = decode_getfattr(xdr, res->fattr, res->server);
6430                 if (status != 0)
6431                         goto out;
6432         }
6433         status = decode_close(xdr, res);
6434 out:
6435         return status;
6436 }
6437 
6438 /*
6439  * Decode OPEN response
6440  */
6441 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6442                              void *data)
6443 {
6444         struct nfs_openres *res = data;
6445         struct compound_hdr hdr;
6446         int status;
6447 
6448         status = decode_compound_hdr(xdr, &hdr);
6449         if (status)
6450                 goto out;
6451         status = decode_sequence(xdr, &res->seq_res, rqstp);
6452         if (status)
6453                 goto out;
6454         status = decode_putfh(xdr);
6455         if (status)
6456                 goto out;
6457         status = decode_open(xdr, res);
6458         if (status)
6459                 goto out;
6460         status = decode_getfh(xdr, &res->fh);
6461         if (status)
6462                 goto out;
6463         if (res->access_request)
6464                 decode_access(xdr, &res->access_supported, &res->access_result);
6465         decode_getfattr_label(xdr, res->f_attr, res->f_label, res->server);
6466         if (res->lg_res)
6467                 decode_layoutget(xdr, rqstp, res->lg_res);
6468 out:
6469         return status;
6470 }
6471 
6472 /*
6473  * Decode OPEN_CONFIRM response
6474  */
6475 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
6476                                      struct xdr_stream *xdr,
6477                                      void *data)
6478 {
6479         struct nfs_open_confirmres *res = data;
6480         struct compound_hdr hdr;
6481         int status;
6482 
6483         status = decode_compound_hdr(xdr, &hdr);
6484         if (status)
6485                 goto out;
6486         status = decode_putfh(xdr);
6487         if (status)
6488                 goto out;
6489         status = decode_open_confirm(xdr, res);
6490 out:
6491         return status;
6492 }
6493 
6494 /*
6495  * Decode OPEN response
6496  */
6497 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
6498                                     struct xdr_stream *xdr,
6499                                     void *data)
6500 {
6501         struct nfs_openres *res = data;
6502         struct compound_hdr hdr;
6503         int status;
6504 
6505         status = decode_compound_hdr(xdr, &hdr);
6506         if (status)
6507                 goto out;
6508         status = decode_sequence(xdr, &res->seq_res, rqstp);
6509         if (status)
6510                 goto out;
6511         status = decode_putfh(xdr);
6512         if (status)
6513                 goto out;
6514         status = decode_open(xdr, res);
6515         if (status)
6516                 goto out;
6517         if (res->access_request)
6518                 decode_access(xdr, &res->access_supported, &res->access_result);
6519         decode_getfattr(xdr, res->f_attr, res->server);
6520         if (res->lg_res)
6521                 decode_layoutget(xdr, rqstp, res->lg_res);
6522 out:
6523         return status;
6524 }
6525 
6526 /*
6527  * Decode SETATTR response
6528  */
6529 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
6530                                 struct xdr_stream *xdr,
6531                                 void *data)
6532 {
6533         struct nfs_setattrres *res = data;
6534         struct compound_hdr hdr;
6535         int status;
6536 
6537         status = decode_compound_hdr(xdr, &hdr);
6538         if (status)
6539                 goto out;
6540         status = decode_sequence(xdr, &res->seq_res, rqstp);
6541         if (status)
6542                 goto out;
6543         status = decode_putfh(xdr);
6544         if (status)
6545                 goto out;
6546         status = decode_setattr(xdr);
6547         if (status)
6548                 goto out;
6549         decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6550 out:
6551         return status;
6552 }
6553 
6554 /*
6555  * Decode LOCK response
6556  */
6557 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6558                              void *data)
6559 {
6560         struct nfs_lock_res *res = data;
6561         struct compound_hdr hdr;
6562         int status;
6563 
6564         status = decode_compound_hdr(xdr, &hdr);
6565         if (status)
6566                 goto out;
6567         status = decode_sequence(xdr, &res->seq_res, rqstp);
6568         if (status)
6569                 goto out;
6570         status = decode_putfh(xdr);
6571         if (status)
6572                 goto out;
6573         status = decode_lock(xdr, res);
6574 out:
6575         return status;
6576 }
6577 
6578 /*
6579  * Decode LOCKT response
6580  */
6581 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6582                               void *data)
6583 {
6584         struct nfs_lockt_res *res = data;
6585         struct compound_hdr hdr;
6586         int status;
6587 
6588         status = decode_compound_hdr(xdr, &hdr);
6589         if (status)
6590                 goto out;
6591         status = decode_sequence(xdr, &res->seq_res, rqstp);
6592         if (status)
6593                 goto out;
6594         status = decode_putfh(xdr);
6595         if (status)
6596                 goto out;
6597         status = decode_lockt(xdr, res);
6598 out:
6599         return status;
6600 }
6601 
6602 /*
6603  * Decode LOCKU response
6604  */
6605 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6606                               void *data)
6607 {
6608         struct nfs_locku_res *res = data;
6609         struct compound_hdr hdr;
6610         int status;
6611 
6612         status = decode_compound_hdr(xdr, &hdr);
6613         if (status)
6614                 goto out;
6615         status = decode_sequence(xdr, &res->seq_res, rqstp);
6616         if (status)
6617                 goto out;
6618         status = decode_putfh(xdr);
6619         if (status)
6620                 goto out;
6621         status = decode_locku(xdr, res);
6622 out:
6623         return status;
6624 }
6625 
6626 static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
6627                                           struct xdr_stream *xdr, void *dummy)
6628 {
6629         struct compound_hdr hdr;
6630         int status;
6631 
6632         status = decode_compound_hdr(xdr, &hdr);
6633         if (!status)
6634                 status = decode_release_lockowner(xdr);
6635         return status;
6636 }
6637 
6638 /*
6639  * Decode READLINK response
6640  */
6641 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
6642                                  struct xdr_stream *xdr,
6643                                  void *data)
6644 {
6645         struct nfs4_readlink_res *res = data;
6646         struct compound_hdr hdr;
6647         int status;
6648 
6649         status = decode_compound_hdr(xdr, &hdr);
6650         if (status)
6651                 goto out;
6652         status = decode_sequence(xdr, &res->seq_res, rqstp);
6653         if (status)
6654                 goto out;
6655         status = decode_putfh(xdr);
6656         if (status)
6657                 goto out;
6658         status = decode_readlink(xdr, rqstp);
6659 out:
6660         return status;
6661 }
6662 
6663 /*
6664  * Decode READDIR response
6665  */
6666 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6667                                 void *data)
6668 {
6669         struct nfs4_readdir_res *res = data;
6670         struct compound_hdr hdr;
6671         int status;
6672 
6673         status = decode_compound_hdr(xdr, &hdr);
6674         if (status)
6675                 goto out;
6676         status = decode_sequence(xdr, &res->seq_res, rqstp);
6677         if (status)
6678                 goto out;
6679         status = decode_putfh(xdr);
6680         if (status)
6681                 goto out;
6682         status = decode_readdir(xdr, rqstp, res);
6683 out:
6684         return status;
6685 }
6686 
6687 /*
6688  * Decode Read response
6689  */
6690 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6691                              void *data)
6692 {
6693         struct nfs_pgio_res *res = data;
6694         struct compound_hdr hdr;
6695         int status;
6696 
6697         status = decode_compound_hdr(xdr, &hdr);
6698         res->op_status = hdr.status;
6699         if (status)
6700                 goto out;
6701         status = decode_sequence(xdr, &res->seq_res, rqstp);
6702         if (status)
6703                 goto out;
6704         status = decode_putfh(xdr);
6705         if (status)
6706                 goto out;
6707         status = decode_read(xdr, rqstp, res);
6708         if (!status)
6709                 status = res->count;
6710 out:
6711         return status;
6712 }
6713 
6714 /*
6715  * Decode WRITE response
6716  */
6717 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6718                               void *data)
6719 {
6720         struct nfs_pgio_res *res = data;
6721         struct compound_hdr hdr;
6722         int status;
6723 
6724         status = decode_compound_hdr(xdr, &hdr);
6725         res->op_status = hdr.status;
6726         if (status)
6727                 goto out;
6728         status = decode_sequence(xdr, &res->seq_res, rqstp);
6729         if (status)
6730                 goto out;
6731         status = decode_putfh(xdr);
6732         if (status)
6733                 goto out;
6734         status = decode_write(xdr, res);
6735         if (status)
6736                 goto out;
6737         if (res->fattr)
6738                 decode_getfattr(xdr, res->fattr, res->server);
6739         if (!status)
6740                 status = res->count;
6741 out:
6742         return status;
6743 }
6744 
6745 /*
6746  * Decode COMMIT response
6747  */
6748 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6749                                void *data)
6750 {
6751         struct nfs_commitres *res = data;
6752         struct compound_hdr hdr;
6753         int status;
6754 
6755         status = decode_compound_hdr(xdr, &hdr);
6756         res->op_status = hdr.status;
6757         if (status)
6758                 goto out;
6759         status = decode_sequence(xdr, &res->seq_res, rqstp);
6760         if (status)
6761                 goto out;
6762         status = decode_putfh(xdr);
6763         if (status)
6764                 goto out;
6765         status = decode_commit(xdr, res);
6766 out:
6767         return status;
6768 }
6769 
6770 /*
6771  * Decode FSINFO response
6772  */
6773 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
6774                                void *data)
6775 {
6776         struct nfs4_fsinfo_res *res = data;
6777         struct compound_hdr hdr;
6778         int status;
6779 
6780         status = decode_compound_hdr(xdr, &hdr);
6781         if (!status)
6782                 status = decode_sequence(xdr, &res->seq_res, req);
6783         if (!status)
6784                 status = decode_putfh(xdr);
6785         if (!status)
6786                 status = decode_fsinfo(xdr, res->fsinfo);
6787         return status;
6788 }
6789 
6790 /*
6791  * Decode PATHCONF response
6792  */
6793 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
6794                                  void *data)
6795 {
6796         struct nfs4_pathconf_res *res = data;
6797         struct compound_hdr hdr;
6798         int status;
6799 
6800         status = decode_compound_hdr(xdr, &hdr);
6801         if (!status)
6802                 status = decode_sequence(xdr, &res->seq_res, req);
6803         if (!status)
6804                 status = decode_putfh(xdr);
6805         if (!status)
6806                 status = decode_pathconf(xdr, res->pathconf);
6807         return status;
6808 }
6809 
6810 /*
6811  * Decode STATFS response
6812  */
6813 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
6814                                void *data)
6815 {
6816         struct nfs4_statfs_res *res = data;
6817         struct compound_hdr hdr;
6818         int status;
6819 
6820         status = decode_compound_hdr(xdr, &hdr);
6821         if (!status)
6822                 status = decode_sequence(xdr, &res->seq_res, req);
6823         if (!status)
6824                 status = decode_putfh(xdr);
6825         if (!status)
6826                 status = decode_statfs(xdr, res->fsstat);
6827         return status;
6828 }
6829 
6830 /*
6831  * Decode GETATTR_BITMAP response
6832  */
6833 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
6834                                     struct xdr_stream *xdr,
6835                                     void *data)
6836 {
6837         struct nfs4_server_caps_res *res = data;
6838         struct compound_hdr hdr;
6839         int status;
6840 
6841         status = decode_compound_hdr(xdr, &hdr);
6842         if (status)
6843                 goto out;
6844         status = decode_sequence(xdr, &res->seq_res, req);
6845         if (status)
6846                 goto out;
6847         status = decode_putfh(xdr);
6848         if (status)
6849                 goto out;
6850         status = decode_server_caps(xdr, res);
6851 out:
6852         return status;
6853 }
6854 
6855 /*
6856  * Decode RENEW response
6857  */
6858 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6859                               void *__unused)
6860 {
6861         struct compound_hdr hdr;
6862         int status;
6863 
6864         status = decode_compound_hdr(xdr, &hdr);
6865         if (!status)
6866                 status = decode_renew(xdr);
6867         return status;
6868 }
6869 
6870 /*
6871  * Decode SETCLIENTID response
6872  */
6873 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
6874                                     struct xdr_stream *xdr,
6875                                     void *data)
6876 {
6877         struct nfs4_setclientid_res *res = data;
6878         struct compound_hdr hdr;
6879         int status;
6880 
6881         status = decode_compound_hdr(xdr, &hdr);
6882         if (!status)
6883                 status = decode_setclientid(xdr, res);
6884         return status;
6885 }
6886 
6887 /*
6888  * Decode SETCLIENTID_CONFIRM response
6889  */
6890 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
6891                                             struct xdr_stream *xdr,
6892                                             void *data)
6893 {
6894         struct compound_hdr hdr;
6895         int status;
6896 
6897         status = decode_compound_hdr(xdr, &hdr);
6898         if (!status)
6899                 status = decode_setclientid_confirm(xdr);
6900         return status;
6901 }
6902 
6903 /*
6904  * Decode DELEGRETURN response
6905  */
6906 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
6907                                     struct xdr_stream *xdr,
6908                                     void *data)
6909 {
6910         struct nfs4_delegreturnres *res = data;
6911         struct compound_hdr hdr;
6912         int status;
6913 
6914         status = decode_compound_hdr(xdr, &hdr);
6915         if (status)
6916                 goto out;
6917         status = decode_sequence(xdr, &res->seq_res, rqstp);
6918         if (status)
6919                 goto out;
6920         status = decode_putfh(xdr);
6921         if (status != 0)
6922                 goto out;
6923         if (res->lr_res) {
6924                 status = decode_layoutreturn(xdr, res->lr_res);
6925                 res->lr_ret = status;
6926                 if (status)
6927                         goto out;
6928         }
6929         if (res->fattr) {
6930                 status = decode_getfattr(xdr, res->fattr, res->server);
6931                 if (status != 0)
6932                         goto out;
6933         }
6934         status = decode_delegreturn(xdr);
6935 out:
6936         return status;
6937 }
6938 
6939 /*
6940  * Decode FS_LOCATIONS response
6941  */
6942 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
6943                                      struct xdr_stream *xdr,
6944                                      void *data)
6945 {
6946         struct nfs4_fs_locations_res *res = data;
6947         struct compound_hdr hdr;
6948         int status;
6949 
6950         status = decode_compound_hdr(xdr, &hdr);
6951         if (status)
6952                 goto out;
6953         status = decode_sequence(xdr, &res->seq_res, req);
6954         if (status)
6955                 goto out;
6956         status = decode_putfh(xdr);
6957         if (status)
6958                 goto out;
6959         if (res->migration) {
6960                 xdr_enter_page(xdr, PAGE_SIZE);
6961                 status = decode_getfattr_generic(xdr,
6962                                         &res->fs_locations->fattr,
6963                                          NULL, res->fs_locations,
6964                                          NULL, res->fs_locations->server);
6965                 if (status)
6966                         goto out;
6967                 if (res->renew)
6968                         status = decode_renew(xdr);
6969         } else {
6970                 status = decode_lookup(xdr);
6971                 if (status)
6972                         goto out;
6973                 xdr_enter_page(xdr, PAGE_SIZE);
6974                 status = decode_getfattr_generic(xdr,
6975                                         &res->fs_locations->fattr,
6976                                          NULL, res->fs_locations,
6977                                          NULL, res->fs_locations->server);
6978         }
6979 out:
6980         return status;
6981 }
6982 
6983 /*
6984  * Decode SECINFO response
6985  */
6986 static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
6987                                 struct xdr_stream *xdr,
6988                                 void *data)
6989 {
6990         struct nfs4_secinfo_res *res = data;
6991         struct compound_hdr hdr;
6992         int status;
6993 
6994         status = decode_compound_hdr(xdr, &hdr);
6995         if (status)
6996                 goto out;
6997         status = decode_sequence(xdr, &res->seq_res, rqstp);
6998         if (status)
6999                 goto out;
7000         status = decode_putfh(xdr);
7001         if (status)
7002                 goto out;
7003         status = decode_secinfo(xdr, res);
7004 out:
7005         return status;
7006 }
7007 
7008 /*
7009  * Decode FSID_PRESENT response
7010  */
7011 static int nfs4_xdr_dec_fsid_present(struct rpc_rqst *rqstp,
7012                                      struct xdr_stream *xdr,
7013                                      void *data)
7014 {
7015         struct nfs4_fsid_present_res *res = data;
7016         struct compound_hdr hdr;
7017         int status;
7018 
7019         status = decode_compound_hdr(xdr, &hdr);
7020         if (status)
7021                 goto out;
7022         status = decode_sequence(xdr, &res->seq_res, rqstp);
7023         if (status)
7024                 goto out;
7025         status = decode_putfh(xdr);
7026         if (status)
7027                 goto out;
7028         status = decode_getfh(xdr, res->fh);
7029         if (status)
7030                 goto out;
7031         if (res->renew)
7032                 status = decode_renew(xdr);
7033 out:
7034         return status;
7035 }
7036 
7037 #if defined(CONFIG_NFS_V4_1)
7038 /*
7039  * Decode BIND_CONN_TO_SESSION response
7040  */
7041 static int nfs4_xdr_dec_bind_conn_to_session(struct rpc_rqst *rqstp,
7042                                         struct xdr_stream *xdr,
7043                                         void *res)
7044 {
7045         struct compound_hdr hdr;
7046         int status;
7047 
7048         status = decode_compound_hdr(xdr, &hdr);
7049         if (!status)
7050                 status = decode_bind_conn_to_session(xdr, res);
7051         return status;
7052 }
7053 
7054 /*
7055  * Decode EXCHANGE_ID response
7056  */
7057 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
7058                                     struct xdr_stream *xdr,
7059                                     void *res)
7060 {
7061         struct compound_hdr hdr;
7062         int status;
7063 
7064         status = decode_compound_hdr(xdr, &hdr);
7065         if (!status)
7066                 status = decode_exchange_id(xdr, res);
7067         return status;
7068 }
7069 
7070 /*
7071  * Decode CREATE_SESSION response
7072  */
7073 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
7074                                        struct xdr_stream *xdr,
7075                                        void *res)
7076 {
7077         struct compound_hdr hdr;
7078         int status;
7079 
7080         status = decode_compound_hdr(xdr, &hdr);
7081         if (!status)
7082                 status = decode_create_session(xdr, res);
7083         return status;
7084 }
7085 
7086 /*
7087  * Decode DESTROY_SESSION response
7088  */
7089 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
7090                                         struct xdr_stream *xdr,
7091                                         void *res)
7092 {
7093         struct compound_hdr hdr;
7094         int status;
7095 
7096         status = decode_compound_hdr(xdr, &hdr);
7097         if (!status)
7098                 status = decode_destroy_session(xdr, res);
7099         return status;
7100 }
7101 
7102 /*
7103  * Decode DESTROY_CLIENTID response
7104  */
7105 static int nfs4_xdr_dec_destroy_clientid(struct rpc_rqst *rqstp,
7106                                         struct xdr_stream *xdr,
7107                                         void *res)
7108 {
7109         struct compound_hdr hdr;
7110         int status;
7111 
7112         status = decode_compound_hdr(xdr, &hdr);
7113         if (!status)
7114                 status = decode_destroy_clientid(xdr, res);
7115         return status;
7116 }
7117 
7118 /*
7119  * Decode SEQUENCE response
7120  */
7121 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
7122                                  struct xdr_stream *xdr,
7123                                  void *res)
7124 {
7125         struct compound_hdr hdr;
7126         int status;
7127 
7128         status = decode_compound_hdr(xdr, &hdr);
7129         if (!status)
7130                 status = decode_sequence(xdr, res, rqstp);
7131         return status;
7132 }
7133 
7134 #endif
7135 
7136 /*
7137  * Decode GET_LEASE_TIME response
7138  */
7139 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
7140                                        struct xdr_stream *xdr,
7141                                        void *data)
7142 {
7143         struct nfs4_get_lease_time_res *res = data;
7144         struct compound_hdr hdr;
7145         int status;
7146 
7147         status = decode_compound_hdr(xdr, &hdr);
7148         if (!status)
7149                 status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
7150         if (!status)
7151                 status = decode_putrootfh(xdr);
7152         if (!status)
7153                 status = decode_fsinfo(xdr, res->lr_fsinfo);
7154         return status;
7155 }
7156 
7157 #ifdef CONFIG_NFS_V4_1
7158 
7159 /*
7160  * Decode RECLAIM_COMPLETE response
7161  */
7162 static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
7163                                          struct xdr_stream *xdr,
7164                                          void *data)
7165 {
7166         struct nfs41_reclaim_complete_res *res = data;
7167         struct compound_hdr hdr;
7168         int status;
7169 
7170         status = decode_compound_hdr(xdr, &hdr);
7171         if (!status)
7172                 status = decode_sequence(xdr, &res->seq_res, rqstp);
7173         if (!status)
7174                 status = decode_reclaim_complete(xdr, NULL);
7175         return status;
7176 }
7177 
7178 /*
7179  * Decode GETDEVINFO response
7180  */
7181 static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
7182                                       struct xdr_stream *xdr,
7183                                       void *data)
7184 {
7185         struct nfs4_getdeviceinfo_res *res = data;
7186         struct compound_hdr hdr;
7187         int status;
7188 
7189         status = decode_compound_hdr(xdr, &hdr);
7190         if (status != 0)
7191                 goto out;
7192         status = decode_sequence(xdr, &res->seq_res, rqstp);
7193         if (status != 0)
7194                 goto out;
7195         status = decode_getdeviceinfo(xdr, res);
7196 out:
7197         return status;
7198 }
7199 
7200 /*
7201  * Decode LAYOUTGET response
7202  */
7203 static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
7204                                   struct xdr_stream *xdr,
7205                                   void *data)
7206 {
7207         struct nfs4_layoutget_res *res = data;
7208         struct compound_hdr hdr;
7209         int status;
7210 
7211         status = decode_compound_hdr(xdr, &hdr);
7212         if (status)
7213                 goto out;
7214         status = decode_sequence(xdr, &res->seq_res, rqstp);
7215         if (status)
7216                 goto out;
7217         status = decode_putfh(xdr);
7218         if (status)
7219                 goto out;
7220         status = decode_layoutget(xdr, rqstp, res);
7221 out:
7222         return status;
7223 }
7224 
7225 /*
7226  * Decode LAYOUTRETURN response
7227  */
7228 static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
7229                                      struct xdr_stream *xdr,
7230                                      void *data)
7231 {
7232         struct nfs4_layoutreturn_res *res = data;
7233         struct compound_hdr hdr;
7234         int status;
7235 
7236         status = decode_compound_hdr(xdr, &hdr);
7237         if (status)
7238                 goto out;
7239         status = decode_sequence(xdr, &res->seq_res, rqstp);
7240         if (status)
7241                 goto out;
7242         status = decode_putfh(xdr);
7243         if (status)
7244                 goto out;
7245         status = decode_layoutreturn(xdr, res);
7246 out:
7247         return status;
7248 }
7249 
7250 /*
7251  * Decode LAYOUTCOMMIT response
7252  */
7253 static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
7254                                      struct xdr_stream *xdr,
7255                                      void *data)
7256 {
7257         struct nfs4_layoutcommit_res *res = data;
7258         struct compound_hdr hdr;
7259         int status;
7260 
7261         status = decode_compound_hdr(xdr, &hdr);
7262         if (status)
7263                 goto out;
7264         status = decode_sequence(xdr, &res->seq_res, rqstp);
7265         if (status)
7266                 goto out;
7267         status = decode_putfh(xdr);
7268         if (status)
7269                 goto out;
7270         status = decode_layoutcommit(xdr, rqstp, res);
7271         if (status)
7272                 goto out;
7273         decode_getfattr(xdr, res->fattr, res->server);
7274 out:
7275         return status;
7276 }
7277 
7278 /*
7279  * Decode SECINFO_NO_NAME response
7280  */
7281 static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
7282                                         struct xdr_stream *xdr,
7283                                         void *data)
7284 {
7285         struct nfs4_secinfo_res *res = data;
7286         struct compound_hdr hdr;
7287         int status;
7288 
7289         status = decode_compound_hdr(xdr, &hdr);
7290         if (status)
7291                 goto out;
7292         status = decode_sequence(xdr, &res->seq_res, rqstp);
7293         if (status)
7294                 goto out;
7295         status = decode_putrootfh(xdr);
7296         if (status)
7297                 goto out;
7298         status = decode_secinfo_no_name(xdr, res);
7299 out:
7300         return status;
7301 }
7302 
7303 /*
7304  * Decode TEST_STATEID response
7305  */
7306 static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
7307                                      struct xdr_stream *xdr,
7308                                      void *data)
7309 {
7310         struct nfs41_test_stateid_res *res = data;
7311         struct compound_hdr hdr;
7312         int status;
7313 
7314         status = decode_compound_hdr(xdr, &hdr);
7315         if (status)
7316                 goto out;
7317         status = decode_sequence(xdr, &res->seq_res, rqstp);
7318         if (status)
7319                 goto out;
7320         status = decode_test_stateid(xdr, res);
7321 out:
7322         return status;
7323 }
7324 
7325 /*
7326  * Decode FREE_STATEID response
7327  */
7328 static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
7329                                      struct xdr_stream *xdr,
7330                                      void *data)
7331 {
7332         struct nfs41_free_stateid_res *res = data;
7333         struct compound_hdr hdr;
7334         int status;
7335 
7336         status = decode_compound_hdr(xdr, &hdr);
7337         if (status)
7338                 goto out;
7339         status = decode_sequence(xdr, &res->seq_res, rqstp);
7340         if (status)
7341                 goto out;
7342         status = decode_free_stateid(xdr, res);
7343 out:
7344         return status;
7345 }
7346 #endif /* CONFIG_NFS_V4_1 */
7347 
7348 /**
7349  * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
7350  *                      the local page cache.
7351  * @xdr: XDR stream where entry resides
7352  * @entry: buffer to fill in with entry data
7353  * @plus: boolean indicating whether this should be a readdirplus entry
7354  *
7355  * Returns zero if successful, otherwise a negative errno value is
7356  * returned.
7357  *
7358  * This function is not invoked during READDIR reply decoding, but
7359  * rather whenever an application invokes the getdents(2) system call
7360  * on a directory already in our cache.
7361  */
7362 int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
7363                        bool plus)
7364 {
7365         unsigned int savep;
7366         uint32_t bitmap[3] = {0};
7367         uint32_t len;
7368         uint64_t new_cookie;
7369         __be32 *p = xdr_inline_decode(xdr, 4);
7370         if (unlikely(!p))
7371                 return -EAGAIN;
7372         if (*p == xdr_zero) {
7373                 p = xdr_inline_decode(xdr, 4);
7374                 if (unlikely(!p))
7375                         return -EAGAIN;
7376                 if (*p == xdr_zero)
7377                         return -EAGAIN;
7378                 entry->eof = 1;
7379                 return -EBADCOOKIE;
7380         }
7381 
7382         p = xdr_inline_decode(xdr, 12);
7383         if (unlikely(!p))
7384                 return -EAGAIN;
7385         p = xdr_decode_hyper(p, &new_cookie);
7386         entry->len = be32_to_cpup(p);
7387 
7388         p = xdr_inline_decode(xdr, entry->len);
7389         if (unlikely(!p))
7390                 return -EAGAIN;
7391         entry->name = (const char *) p;
7392 
7393         /*
7394          * In case the server doesn't return an inode number,
7395          * we fake one here.  (We don't use inode number 0,
7396          * since glibc seems to choke on it...)
7397          */
7398         entry->ino = 1;
7399         entry->fattr->valid = 0;
7400 
7401         if (decode_attr_bitmap(xdr, bitmap) < 0)
7402                 return -EAGAIN;
7403 
7404         if (decode_attr_length(xdr, &len, &savep) < 0)
7405                 return -EAGAIN;
7406 
7407         if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
7408                         NULL, entry->label, entry->server) < 0)
7409                 return -EAGAIN;
7410         if (entry->fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
7411                 entry->ino = entry->fattr->mounted_on_fileid;
7412         else if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
7413                 entry->ino = entry->fattr->fileid;
7414 
7415         entry->d_type = DT_UNKNOWN;
7416         if (entry->fattr->valid & NFS_ATTR_FATTR_TYPE)
7417                 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
7418 
7419         entry->prev_cookie = entry->cookie;
7420         entry->cookie = new_cookie;
7421 
7422         return 0;
7423 }
7424 
7425 /*
7426  * We need to translate between nfs status return values and
7427  * the local errno values which may not be the same.
7428  */
7429 static struct {
7430         int stat;
7431         int errno;
7432 } nfs_errtbl[] = {
7433         { NFS4_OK,              0               },
7434         { NFS4ERR_PERM,         -EPERM          },
7435         { NFS4ERR_NOENT,        -ENOENT         },
7436         { NFS4ERR_IO,           -errno_NFSERR_IO},
7437         { NFS4ERR_NXIO,         -ENXIO          },
7438         { NFS4ERR_ACCESS,       -EACCES         },
7439         { NFS4ERR_EXIST,        -EEXIST         },
7440         { NFS4ERR_XDEV,         -EXDEV          },
7441         { NFS4ERR_NOTDIR,       -ENOTDIR        },
7442         { NFS4ERR_ISDIR,        -EISDIR         },
7443         { NFS4ERR_INVAL,        -EINVAL         },
7444         { NFS4ERR_FBIG,         -EFBIG          },
7445         { NFS4ERR_NOSPC,        -ENOSPC         },
7446         { NFS4ERR_ROFS,         -EROFS          },
7447         { NFS4ERR_MLINK,        -EMLINK         },
7448         { NFS4ERR_NAMETOOLONG,  -ENAMETOOLONG   },
7449         { NFS4ERR_NOTEMPTY,     -ENOTEMPTY      },
7450         { NFS4ERR_DQUOT,        -EDQUOT         },
7451         { NFS4ERR_STALE,        -ESTALE         },
7452         { NFS4ERR_BADHANDLE,    -EBADHANDLE     },
7453         { NFS4ERR_BAD_COOKIE,   -EBADCOOKIE     },
7454         { NFS4ERR_NOTSUPP,      -ENOTSUPP       },
7455         { NFS4ERR_TOOSMALL,     -ETOOSMALL      },
7456         { NFS4ERR_SERVERFAULT,  -EREMOTEIO      },
7457         { NFS4ERR_BADTYPE,      -EBADTYPE       },
7458         { NFS4ERR_LOCKED,       -EAGAIN         },
7459         { NFS4ERR_SYMLINK,      -ELOOP          },
7460         { NFS4ERR_OP_ILLEGAL,   -EOPNOTSUPP     },
7461         { NFS4ERR_DEADLOCK,     -EDEADLK        },
7462         { -1,                   -EIO            }
7463 };
7464 
7465 /*
7466  * Convert an NFS error code to a local one.
7467  * This one is used jointly by NFSv2 and NFSv3.
7468  */
7469 static int
7470 nfs4_stat_to_errno(int stat)
7471 {
7472         int i;
7473         for (i = 0; nfs_errtbl[i].stat != -1; i++) {
7474                 if (nfs_errtbl[i].stat == stat)
7475                         return nfs_errtbl[i].errno;
7476         }
7477         if (stat <= 10000 || stat > 10100) {
7478                 /* The server is looney tunes. */
7479                 return -EREMOTEIO;
7480         }
7481         /* If we cannot translate the error, the recovery routines should
7482          * handle it.
7483          * Note: remaining NFSv4 error codes have values > 10000, so should
7484          * not conflict with native Linux error codes.
7485          */
7486         return -stat;
7487 }
7488 
7489 #ifdef CONFIG_NFS_V4_2
7490 #include "nfs42xdr.c"
7491 #endif /* CONFIG_NFS_V4_2 */
7492 
7493 #define PROC(proc, argtype, restype)                            \
7494 [NFSPROC4_CLNT_##proc] = {                                      \
7495         .p_proc   = NFSPROC4_COMPOUND,                          \
7496         .p_encode = nfs4_xdr_##argtype,                         \
7497         .p_decode = nfs4_xdr_##restype,                         \
7498         .p_arglen = NFS4_##argtype##_sz,                        \
7499         .p_replen = NFS4_##restype##_sz,                        \
7500         .p_statidx = NFSPROC4_CLNT_##proc,                      \
7501         .p_name   = #proc,                                      \
7502 }
7503 
7504 #define STUB(proc)              \
7505 [NFSPROC4_CLNT_##proc] = {      \
7506         .p_name = #proc,        \
7507 }
7508 
7509 #if defined(CONFIG_NFS_V4_1)
7510 #define PROC41(proc, argtype, restype)                          \
7511         PROC(proc, argtype, restype)
7512 #else
7513 #define PROC41(proc, argtype, restype)                          \
7514         STUB(proc)
7515 #endif
7516 
7517 #if defined(CONFIG_NFS_V4_2)
7518 #define PROC42(proc, argtype, restype)                          \
7519         PROC(proc, argtype, restype)
7520 #else
7521 #define PROC42(proc, argtype, restype)                          \
7522         STUB(proc)
7523 #endif
7524 
7525 const struct rpc_procinfo nfs4_procedures[] = {
7526         PROC(READ,              enc_read,               dec_read),
7527         PROC(WRITE,             enc_write,              dec_write),
7528         PROC(COMMIT,            enc_commit,             dec_commit),
7529         PROC(OPEN,              enc_open,               dec_open),
7530         PROC(OPEN_CONFIRM,      enc_open_confirm,       dec_open_confirm),
7531         PROC(OPEN_NOATTR,       enc_open_noattr,        dec_open_noattr),
7532         PROC(OPEN_DOWNGRADE,    enc_open_downgrade,     dec_open_downgrade),
7533         PROC(CLOSE,             enc_close,              dec_close),
7534         PROC(SETATTR,           enc_setattr,            dec_setattr),
7535         PROC(FSINFO,            enc_fsinfo,             dec_fsinfo),
7536         PROC(RENEW,             enc_renew,              dec_renew),
7537         PROC(SETCLIENTID,       enc_setclientid,        dec_setclientid),
7538         PROC(SETCLIENTID_CONFIRM, enc_setclientid_confirm, dec_setclientid_confirm),
7539         PROC(LOCK,              enc_lock,               dec_lock),
7540         PROC(LOCKT,             enc_lockt,              dec_lockt),
7541         PROC(LOCKU,             enc_locku,              dec_locku),
7542         PROC(ACCESS,            enc_access,             dec_access),
7543         PROC(GETATTR,           enc_getattr,            dec_getattr),
7544         PROC(LOOKUP,            enc_lookup,             dec_lookup),
7545         PROC(LOOKUP_ROOT,       enc_lookup_root,        dec_lookup_root),
7546         PROC(REMOVE,            enc_remove,             dec_remove),
7547         PROC(RENAME,            enc_rename,             dec_rename),
7548         PROC(LINK,              enc_link,               dec_link),
7549         PROC(SYMLINK,           enc_symlink,            dec_symlink),
7550         PROC(CREATE,            enc_create,             dec_create),
7551         PROC(PATHCONF,          enc_pathconf,           dec_pathconf),
7552         PROC(STATFS,            enc_statfs,             dec_statfs),
7553         PROC(READLINK,          enc_readlink,           dec_readlink),
7554         PROC(READDIR,           enc_readdir,            dec_readdir),
7555         PROC(SERVER_CAPS,       enc_server_caps,        dec_server_caps),
7556         PROC(DELEGRETURN,       enc_delegreturn,        dec_delegreturn),
7557         PROC(GETACL,            enc_getacl,             dec_getacl),
7558         PROC(SETACL,            enc_setacl,             dec_setacl),
7559         PROC(FS_LOCATIONS,      enc_fs_locations,       dec_fs_locations),
7560         PROC(RELEASE_LOCKOWNER, enc_release_lockowner,  dec_release_lockowner),
7561         PROC(SECINFO,           enc_secinfo,            dec_secinfo),
7562         PROC(FSID_PRESENT,      enc_fsid_present,       dec_fsid_present),
7563         PROC41(EXCHANGE_ID,     enc_exchange_id,        dec_exchange_id),
7564         PROC41(CREATE_SESSION,  enc_create_session,     dec_create_session),
7565         PROC41(DESTROY_SESSION, enc_destroy_session,    dec_destroy_session),
7566         PROC41(SEQUENCE,        enc_sequence,           dec_sequence),
7567         PROC(GET_LEASE_TIME,    enc_get_lease_time,     dec_get_lease_time),
7568         PROC41(RECLAIM_COMPLETE,enc_reclaim_complete,   dec_reclaim_complete),
7569         PROC41(GETDEVICEINFO,   enc_getdeviceinfo,      dec_getdeviceinfo),
7570         PROC41(LAYOUTGET,       enc_layoutget,          dec_layoutget),
7571         PROC41(LAYOUTCOMMIT,    enc_layoutcommit,       dec_layoutcommit),
7572         PROC41(LAYOUTRETURN,    enc_layoutreturn,       dec_layoutreturn),
7573         PROC41(SECINFO_NO_NAME, enc_secinfo_no_name,    dec_secinfo_no_name),
7574         PROC41(TEST_STATEID,    enc_test_stateid,       dec_test_stateid),
7575         PROC41(FREE_STATEID,    enc_free_stateid,       dec_free_stateid),
7576         STUB(GETDEVICELIST),
7577         PROC41(BIND_CONN_TO_SESSION,
7578                         enc_bind_conn_to_session, dec_bind_conn_to_session),
7579         PROC41(DESTROY_CLIENTID,enc_destroy_clientid,   dec_destroy_clientid),
7580         PROC42(SEEK,            enc_seek,               dec_seek),
7581         PROC42(ALLOCATE,        enc_allocate,           dec_allocate),
7582         PROC42(DEALLOCATE,      enc_deallocate,         dec_deallocate),
7583         PROC42(LAYOUTSTATS,     enc_layoutstats,        dec_layoutstats),
7584         PROC42(CLONE,           enc_clone,              dec_clone),
7585         PROC42(COPY,            enc_copy,               dec_copy),
7586         PROC42(OFFLOAD_CANCEL,  enc_offload_cancel,     dec_offload_cancel),
7587         PROC(LOOKUPP,           enc_lookupp,            dec_lookupp),
7588         PROC42(LAYOUTERROR,     enc_layouterror,        dec_layouterror),
7589 };
7590 
7591 static unsigned int nfs_version4_counts[ARRAY_SIZE(nfs4_procedures)];
7592 const struct rpc_version nfs_version4 = {
7593         .number                 = 4,
7594         .nrprocs                = ARRAY_SIZE(nfs4_procedures),
7595         .procs                  = nfs4_procedures,
7596         .counts                 = nfs_version4_counts,
7597 };
7598 
7599 /*
7600  * Local variables:
7601  *  c-basic-offset: 8
7602  * End:
7603  */