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TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs4xdr.c

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  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 #include <linux/nfs_idmap.h>
 56 
 57 #include "nfs4_fs.h"
 58 #include "internal.h"
 59 #include "nfs4session.h"
 60 #include "pnfs.h"
 61 #include "netns.h"
 62 
 63 #define NFSDBG_FACILITY         NFSDBG_XDR
 64 
 65 /* Mapping from NFS error code to "errno" error code. */
 66 #define errno_NFSERR_IO         EIO
 67 
 68 static int nfs4_stat_to_errno(int);
 69 
 70 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
 71 #ifdef DEBUG
 72 #define NFS4_MAXTAGLEN          20
 73 #else
 74 #define NFS4_MAXTAGLEN          0
 75 #endif
 76 
 77 /* lock,open owner id:
 78  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
 79  */
 80 #define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
 81 #define lock_owner_id_maxsz     (1 + 1 + 4)
 82 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 83 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 84 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 85 #define op_encode_hdr_maxsz     (1)
 86 #define op_decode_hdr_maxsz     (2)
 87 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 88 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 89 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 90 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 91 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
 92                                 (NFS4_FHSIZE >> 2))
 93 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
 94 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
 95 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
 96 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
 97 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
 98                                 ((3+NFS4_FHSIZE) >> 2))
 99 #define nfs4_fattr_bitmap_maxsz 4
100 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
101 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
102 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
103 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
104 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
105 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
106 /* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
107 #define nfs4_label_maxsz        (4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
108 #else
109 #define nfs4_label_maxsz        0
110 #endif
111 /* We support only one layout type per file system */
112 #define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
113 /* This is based on getfattr, which uses the most attributes: */
114 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
115                                 3 + 3 + 3 + nfs4_owner_maxsz + \
116                                 nfs4_group_maxsz + nfs4_label_maxsz + \
117                                  decode_mdsthreshold_maxsz))
118 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
119                                 nfs4_fattr_value_maxsz)
120 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
121 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
122                                  1 + 2 + 1 + \
123                                 nfs4_owner_maxsz + \
124                                 nfs4_group_maxsz + \
125                                 nfs4_label_maxsz + \
126                                 4 + 4)
127 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
128 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
129 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
130 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
131 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
132 /* The 5 accounts for the PNFS attributes, and assumes that at most three
133  * layout types will be returned.
134  */
135 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
136                                  nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
137 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
138 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
139 #define encode_setclientid_maxsz \
140                                 (op_encode_hdr_maxsz + \
141                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
142                                 XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
143                                 1 /* sc_prog */ + \
144                                 XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
145                                 XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
146                                 1) /* sc_cb_ident */
147 #define decode_setclientid_maxsz \
148                                 (op_decode_hdr_maxsz + \
149                                 2 + \
150                                 1024) /* large value for CLID_INUSE */
151 #define encode_setclientid_confirm_maxsz \
152                                 (op_encode_hdr_maxsz + \
153                                 3 + (NFS4_VERIFIER_SIZE >> 2))
154 #define decode_setclientid_confirm_maxsz \
155                                 (op_decode_hdr_maxsz)
156 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
157 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
158 #define encode_share_access_maxsz \
159                                 (2)
160 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
161 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
162 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
163 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
164                                 2 + encode_share_access_maxsz + 2 + \
165                                 open_owner_id_maxsz + \
166                                 encode_opentype_maxsz + \
167                                 encode_claim_null_maxsz)
168 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
169 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
170                                 decode_ace_maxsz)
171 #define decode_change_info_maxsz        (5)
172 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
173                                 decode_stateid_maxsz + \
174                                 decode_change_info_maxsz + 1 + \
175                                 nfs4_fattr_bitmap_maxsz + \
176                                 decode_delegation_maxsz)
177 #define encode_open_confirm_maxsz \
178                                 (op_encode_hdr_maxsz + \
179                                  encode_stateid_maxsz + 1)
180 #define decode_open_confirm_maxsz \
181                                 (op_decode_hdr_maxsz + \
182                                  decode_stateid_maxsz)
183 #define encode_open_downgrade_maxsz \
184                                 (op_encode_hdr_maxsz + \
185                                  encode_stateid_maxsz + 1 + \
186                                  encode_share_access_maxsz)
187 #define decode_open_downgrade_maxsz \
188                                 (op_decode_hdr_maxsz + \
189                                  decode_stateid_maxsz)
190 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
191                                  1 + encode_stateid_maxsz)
192 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
193                                  decode_stateid_maxsz)
194 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
195                                  encode_stateid_maxsz + \
196                                  encode_attrs_maxsz)
197 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
198                                  nfs4_fattr_bitmap_maxsz)
199 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
200                                  encode_stateid_maxsz + 3)
201 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
202 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
203                                  2 + encode_verifier_maxsz + 5 + \
204                                 nfs4_label_maxsz)
205 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
206                                  decode_verifier_maxsz)
207 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
208 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
209 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
210                                  encode_stateid_maxsz + 4)
211 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
212                                  2 + decode_verifier_maxsz)
213 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
214 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
215                                  decode_verifier_maxsz)
216 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
217                                 nfs4_name_maxsz)
218 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
219                                  decode_change_info_maxsz)
220 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
221                                 2 * nfs4_name_maxsz)
222 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
223                                  decode_change_info_maxsz + \
224                                  decode_change_info_maxsz)
225 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
226                                 nfs4_name_maxsz)
227 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
228 #define encode_lockowner_maxsz  (7)
229 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
230                                  7 + \
231                                  1 + encode_stateid_maxsz + 1 + \
232                                  encode_lockowner_maxsz)
233 #define decode_lock_denied_maxsz \
234                                 (8 + decode_lockowner_maxsz)
235 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
236                                  decode_lock_denied_maxsz)
237 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
238                                 encode_lockowner_maxsz)
239 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
240                                  decode_lock_denied_maxsz)
241 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
242                                  encode_stateid_maxsz + \
243                                  4)
244 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
245                                  decode_stateid_maxsz)
246 #define encode_release_lockowner_maxsz \
247                                 (op_encode_hdr_maxsz + \
248                                  encode_lockowner_maxsz)
249 #define decode_release_lockowner_maxsz \
250                                 (op_decode_hdr_maxsz)
251 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
252 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
253 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
254                                 1 + nfs4_name_maxsz + \
255                                 1 + \
256                                 nfs4_fattr_maxsz)
257 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
258 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
259                                 1 + 2 + nfs4_name_maxsz + \
260                                 encode_attrs_maxsz)
261 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
262                                 decode_change_info_maxsz + \
263                                 nfs4_fattr_bitmap_maxsz)
264 #define encode_statfs_maxsz     (encode_getattr_maxsz)
265 #define decode_statfs_maxsz     (decode_getattr_maxsz)
266 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
267 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
268 #define encode_getacl_maxsz     (encode_getattr_maxsz)
269 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
270                                  nfs4_fattr_bitmap_maxsz + 1)
271 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
272                                  encode_stateid_maxsz + 3)
273 #define decode_setacl_maxsz     (decode_setattr_maxsz)
274 #define encode_fs_locations_maxsz \
275                                 (encode_getattr_maxsz)
276 #define decode_fs_locations_maxsz \
277                                 (0)
278 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
279 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
280 
281 #if defined(CONFIG_NFS_V4_1)
282 #define NFS4_MAX_MACHINE_NAME_LEN (64)
283 #define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
284                          sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
285 
286 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
287                                 encode_verifier_maxsz + \
288                                 1 /* co_ownerid.len */ + \
289                                 XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
290                                 1 /* flags */ + \
291                                 1 /* spa_how */ + \
292                                 /* max is SP4_MACH_CRED (for now) */ + \
293                                 1 + NFS4_OP_MAP_NUM_WORDS + \
294                                 1 + NFS4_OP_MAP_NUM_WORDS + \
295                                 1 /* implementation id array of size 1 */ + \
296                                 1 /* nii_domain */ + \
297                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
298                                 1 /* nii_name */ + \
299                                 XDR_QUADLEN(IMPL_NAME_LIMIT) + \
300                                 3 /* nii_date */)
301 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
302                                 2 /* eir_clientid */ + \
303                                 1 /* eir_sequenceid */ + \
304                                 1 /* eir_flags */ + \
305                                 1 /* spr_how */ + \
306                                   /* max is SP4_MACH_CRED (for now) */ + \
307                                 1 + NFS4_OP_MAP_NUM_WORDS + \
308                                 1 + NFS4_OP_MAP_NUM_WORDS + \
309                                 2 /* eir_server_owner.so_minor_id */ + \
310                                 /* eir_server_owner.so_major_id<> */ \
311                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
312                                 /* eir_server_scope<> */ \
313                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
314                                 1 /* eir_server_impl_id array length */ + \
315                                 1 /* nii_domain */ + \
316                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
317                                 1 /* nii_name */ + \
318                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
319                                 3 /* nii_date */)
320 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
321 #define decode_channel_attrs_maxsz  (6 + \
322                                      1 /* ca_rdma_ird.len */ + \
323                                      1 /* ca_rdma_ird */)
324 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
325                                      2 /* csa_clientid */ + \
326                                      1 /* csa_sequence */ + \
327                                      1 /* csa_flags */ + \
328                                      encode_channel_attrs_maxsz + \
329                                      encode_channel_attrs_maxsz + \
330                                      1 /* csa_cb_program */ + \
331                                      1 /* csa_sec_parms.len (1) */ + \
332                                      1 /* cb_secflavor (AUTH_SYS) */ + \
333                                      1 /* stamp */ + \
334                                      1 /* machinename.len */ + \
335                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
336                                      1 /* uid */ + \
337                                      1 /* gid */ + \
338                                      1 /* gids.len (0) */)
339 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
340                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
341                                      1 /* csr_sequence */ + \
342                                      1 /* csr_flags */ + \
343                                      decode_channel_attrs_maxsz + \
344                                      decode_channel_attrs_maxsz)
345 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
346                                      /* bctsa_sessid */ \
347                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
348                                      1 /* bctsa_dir */ + \
349                                      1 /* bctsa_use_conn_in_rdma_mode */)
350 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
351                                      /* bctsr_sessid */ \
352                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
353                                      1 /* bctsr_dir */ + \
354                                      1 /* bctsr_use_conn_in_rdma_mode */)
355 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
356 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
357 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
358 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
359 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
360                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
361 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
362                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
363 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
364 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
365 #define encode_getdevicelist_maxsz (op_encode_hdr_maxsz + 4 + \
366                                 encode_verifier_maxsz)
367 #define decode_getdevicelist_maxsz (op_decode_hdr_maxsz + \
368                                 2 /* nfs_cookie4 gdlr_cookie */ + \
369                                 decode_verifier_maxsz \
370                                   /* verifier4 gdlr_verifier */ + \
371                                 1 /* gdlr_deviceid_list count */ + \
372                                 XDR_QUADLEN(NFS4_PNFS_GETDEVLIST_MAXNUM * \
373                                             NFS4_DEVICEID4_SIZE) \
374                                   /* gdlr_deviceid_list */ + \
375                                 1 /* bool gdlr_eof */)
376 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + 4 + \
377                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE))
378 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
379                                 1 /* layout type */ + \
380                                 1 /* opaque devaddr4 length */ + \
381                                   /* devaddr4 payload is read into page */ \
382                                 1 /* notification bitmap length */ + \
383                                 1 /* notification bitmap */)
384 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
385                                 encode_stateid_maxsz)
386 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
387                                 decode_stateid_maxsz + \
388                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
389 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
390                                 2 /* offset */ + \
391                                 2 /* length */ + \
392                                 1 /* reclaim */ + \
393                                 encode_stateid_maxsz + \
394                                 1 /* new offset (true) */ + \
395                                 2 /* last byte written */ + \
396                                 1 /* nt_timechanged (false) */ + \
397                                 1 /* layoutupdate4 layout type */ + \
398                                 1 /* NULL filelayout layoutupdate4 payload */)
399 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
400 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
401                                 encode_stateid_maxsz + \
402                                 1 /* FIXME: opaque lrf_body always empty at the moment */)
403 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
404                                 1 + decode_stateid_maxsz)
405 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
406 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
407 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
408                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
409 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
410 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
411                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
412 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz)
413 #else /* CONFIG_NFS_V4_1 */
414 #define encode_sequence_maxsz   0
415 #define decode_sequence_maxsz   0
416 #endif /* CONFIG_NFS_V4_1 */
417 
418 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
419 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
420 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
421                                 encode_sequence_maxsz + \
422                                 encode_putfh_maxsz + \
423                                 encode_read_maxsz)
424 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
425                                 decode_sequence_maxsz + \
426                                 decode_putfh_maxsz + \
427                                 decode_read_maxsz)
428 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
429                                 encode_sequence_maxsz + \
430                                 encode_putfh_maxsz + \
431                                 encode_readlink_maxsz)
432 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
433                                 decode_sequence_maxsz + \
434                                 decode_putfh_maxsz + \
435                                 decode_readlink_maxsz)
436 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
437                                 encode_sequence_maxsz + \
438                                 encode_putfh_maxsz + \
439                                 encode_readdir_maxsz)
440 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
441                                 decode_sequence_maxsz + \
442                                 decode_putfh_maxsz + \
443                                 decode_readdir_maxsz)
444 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
445                                 encode_sequence_maxsz + \
446                                 encode_putfh_maxsz + \
447                                 encode_write_maxsz + \
448                                 encode_getattr_maxsz)
449 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
450                                 decode_sequence_maxsz + \
451                                 decode_putfh_maxsz + \
452                                 decode_write_maxsz + \
453                                 decode_getattr_maxsz)
454 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
455                                 encode_sequence_maxsz + \
456                                 encode_putfh_maxsz + \
457                                 encode_commit_maxsz)
458 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
459                                 decode_sequence_maxsz + \
460                                 decode_putfh_maxsz + \
461                                 decode_commit_maxsz)
462 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
463                                 encode_sequence_maxsz + \
464                                 encode_putfh_maxsz + \
465                                 encode_open_maxsz + \
466                                 encode_access_maxsz + \
467                                 encode_getfh_maxsz + \
468                                 encode_getattr_maxsz)
469 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
470                                 decode_sequence_maxsz + \
471                                 decode_putfh_maxsz + \
472                                 decode_open_maxsz + \
473                                 decode_access_maxsz + \
474                                 decode_getfh_maxsz + \
475                                 decode_getattr_maxsz)
476 #define NFS4_enc_open_confirm_sz \
477                                 (compound_encode_hdr_maxsz + \
478                                  encode_putfh_maxsz + \
479                                  encode_open_confirm_maxsz)
480 #define NFS4_dec_open_confirm_sz \
481                                 (compound_decode_hdr_maxsz + \
482                                  decode_putfh_maxsz + \
483                                  decode_open_confirm_maxsz)
484 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
485                                         encode_sequence_maxsz + \
486                                         encode_putfh_maxsz + \
487                                         encode_open_maxsz + \
488                                         encode_access_maxsz + \
489                                         encode_getattr_maxsz)
490 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
491                                         decode_sequence_maxsz + \
492                                         decode_putfh_maxsz + \
493                                         decode_open_maxsz + \
494                                         decode_access_maxsz + \
495                                         decode_getattr_maxsz)
496 #define NFS4_enc_open_downgrade_sz \
497                                 (compound_encode_hdr_maxsz + \
498                                  encode_sequence_maxsz + \
499                                  encode_putfh_maxsz + \
500                                  encode_open_downgrade_maxsz + \
501                                  encode_getattr_maxsz)
502 #define NFS4_dec_open_downgrade_sz \
503                                 (compound_decode_hdr_maxsz + \
504                                  decode_sequence_maxsz + \
505                                  decode_putfh_maxsz + \
506                                  decode_open_downgrade_maxsz + \
507                                  decode_getattr_maxsz)
508 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
509                                  encode_sequence_maxsz + \
510                                  encode_putfh_maxsz + \
511                                  encode_close_maxsz + \
512                                  encode_getattr_maxsz)
513 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
514                                  decode_sequence_maxsz + \
515                                  decode_putfh_maxsz + \
516                                  decode_close_maxsz + \
517                                  decode_getattr_maxsz)
518 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
519                                  encode_sequence_maxsz + \
520                                  encode_putfh_maxsz + \
521                                  encode_setattr_maxsz + \
522                                  encode_getattr_maxsz)
523 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
524                                  decode_sequence_maxsz + \
525                                  decode_putfh_maxsz + \
526                                  decode_setattr_maxsz + \
527                                  decode_getattr_maxsz)
528 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
529                                 encode_sequence_maxsz + \
530                                 encode_putfh_maxsz + \
531                                 encode_fsinfo_maxsz)
532 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
533                                 decode_sequence_maxsz + \
534                                 decode_putfh_maxsz + \
535                                 decode_fsinfo_maxsz)
536 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
537                                 encode_renew_maxsz)
538 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
539                                 decode_renew_maxsz)
540 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
541                                 encode_setclientid_maxsz)
542 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
543                                 decode_setclientid_maxsz)
544 #define NFS4_enc_setclientid_confirm_sz \
545                                 (compound_encode_hdr_maxsz + \
546                                 encode_setclientid_confirm_maxsz)
547 #define NFS4_dec_setclientid_confirm_sz \
548                                 (compound_decode_hdr_maxsz + \
549                                 decode_setclientid_confirm_maxsz)
550 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
551                                 encode_sequence_maxsz + \
552                                 encode_putfh_maxsz + \
553                                 encode_lock_maxsz)
554 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
555                                 decode_sequence_maxsz + \
556                                 decode_putfh_maxsz + \
557                                 decode_lock_maxsz)
558 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
559                                 encode_sequence_maxsz + \
560                                 encode_putfh_maxsz + \
561                                 encode_lockt_maxsz)
562 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
563                                  decode_sequence_maxsz + \
564                                  decode_putfh_maxsz + \
565                                  decode_lockt_maxsz)
566 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
567                                 encode_sequence_maxsz + \
568                                 encode_putfh_maxsz + \
569                                 encode_locku_maxsz)
570 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
571                                 decode_sequence_maxsz + \
572                                 decode_putfh_maxsz + \
573                                 decode_locku_maxsz)
574 #define NFS4_enc_release_lockowner_sz \
575                                 (compound_encode_hdr_maxsz + \
576                                  encode_lockowner_maxsz)
577 #define NFS4_dec_release_lockowner_sz \
578                                 (compound_decode_hdr_maxsz + \
579                                  decode_lockowner_maxsz)
580 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
581                                 encode_sequence_maxsz + \
582                                 encode_putfh_maxsz + \
583                                 encode_access_maxsz + \
584                                 encode_getattr_maxsz)
585 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
586                                 decode_sequence_maxsz + \
587                                 decode_putfh_maxsz + \
588                                 decode_access_maxsz + \
589                                 decode_getattr_maxsz)
590 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
591                                 encode_sequence_maxsz + \
592                                 encode_putfh_maxsz + \
593                                 encode_getattr_maxsz + \
594                                 encode_renew_maxsz)
595 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
596                                 decode_sequence_maxsz + \
597                                 decode_putfh_maxsz + \
598                                 decode_getattr_maxsz + \
599                                 decode_renew_maxsz)
600 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
601                                 encode_sequence_maxsz + \
602                                 encode_putfh_maxsz + \
603                                 encode_lookup_maxsz + \
604                                 encode_getattr_maxsz + \
605                                 encode_getfh_maxsz)
606 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
607                                 decode_sequence_maxsz + \
608                                 decode_putfh_maxsz + \
609                                 decode_lookup_maxsz + \
610                                 decode_getattr_maxsz + \
611                                 decode_getfh_maxsz)
612 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
613                                 encode_sequence_maxsz + \
614                                 encode_putrootfh_maxsz + \
615                                 encode_getattr_maxsz + \
616                                 encode_getfh_maxsz)
617 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
618                                 decode_sequence_maxsz + \
619                                 decode_putrootfh_maxsz + \
620                                 decode_getattr_maxsz + \
621                                 decode_getfh_maxsz)
622 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
623                                 encode_sequence_maxsz + \
624                                 encode_putfh_maxsz + \
625                                 encode_remove_maxsz)
626 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
627                                 decode_sequence_maxsz + \
628                                 decode_putfh_maxsz + \
629                                 decode_remove_maxsz)
630 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
631                                 encode_sequence_maxsz + \
632                                 encode_putfh_maxsz + \
633                                 encode_savefh_maxsz + \
634                                 encode_putfh_maxsz + \
635                                 encode_rename_maxsz)
636 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
637                                 decode_sequence_maxsz + \
638                                 decode_putfh_maxsz + \
639                                 decode_savefh_maxsz + \
640                                 decode_putfh_maxsz + \
641                                 decode_rename_maxsz)
642 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
643                                 encode_sequence_maxsz + \
644                                 encode_putfh_maxsz + \
645                                 encode_savefh_maxsz + \
646                                 encode_putfh_maxsz + \
647                                 encode_link_maxsz + \
648                                 encode_restorefh_maxsz + \
649                                 encode_getattr_maxsz)
650 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
651                                 decode_sequence_maxsz + \
652                                 decode_putfh_maxsz + \
653                                 decode_savefh_maxsz + \
654                                 decode_putfh_maxsz + \
655                                 decode_link_maxsz + \
656                                 decode_restorefh_maxsz + \
657                                 decode_getattr_maxsz)
658 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
659                                 encode_sequence_maxsz + \
660                                 encode_putfh_maxsz + \
661                                 encode_symlink_maxsz + \
662                                 encode_getattr_maxsz + \
663                                 encode_getfh_maxsz)
664 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
665                                 decode_sequence_maxsz + \
666                                 decode_putfh_maxsz + \
667                                 decode_symlink_maxsz + \
668                                 decode_getattr_maxsz + \
669                                 decode_getfh_maxsz)
670 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
671                                 encode_sequence_maxsz + \
672                                 encode_putfh_maxsz + \
673                                 encode_create_maxsz + \
674                                 encode_getfh_maxsz + \
675                                 encode_getattr_maxsz)
676 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
677                                 decode_sequence_maxsz + \
678                                 decode_putfh_maxsz + \
679                                 decode_create_maxsz + \
680                                 decode_getfh_maxsz + \
681                                 decode_getattr_maxsz)
682 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
683                                 encode_sequence_maxsz + \
684                                 encode_putfh_maxsz + \
685                                 encode_getattr_maxsz)
686 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
687                                 decode_sequence_maxsz + \
688                                 decode_putfh_maxsz + \
689                                 decode_getattr_maxsz)
690 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
691                                 encode_sequence_maxsz + \
692                                 encode_putfh_maxsz + \
693                                 encode_statfs_maxsz)
694 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
695                                 decode_sequence_maxsz + \
696                                 decode_putfh_maxsz + \
697                                 decode_statfs_maxsz)
698 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
699                                 encode_sequence_maxsz + \
700                                 encode_putfh_maxsz + \
701                                 encode_getattr_maxsz)
702 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
703                                 decode_sequence_maxsz + \
704                                 decode_putfh_maxsz + \
705                                 decode_getattr_maxsz)
706 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
707                                 encode_sequence_maxsz + \
708                                 encode_putfh_maxsz + \
709                                 encode_delegreturn_maxsz + \
710                                 encode_getattr_maxsz)
711 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
712                                 decode_sequence_maxsz + \
713                                 decode_delegreturn_maxsz + \
714                                 decode_getattr_maxsz)
715 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
716                                 encode_sequence_maxsz + \
717                                 encode_putfh_maxsz + \
718                                 encode_getacl_maxsz)
719 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
720                                 decode_sequence_maxsz + \
721                                 decode_putfh_maxsz + \
722                                 decode_getacl_maxsz)
723 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
724                                 encode_sequence_maxsz + \
725                                 encode_putfh_maxsz + \
726                                 encode_setacl_maxsz)
727 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
728                                 decode_sequence_maxsz + \
729                                 decode_putfh_maxsz + \
730                                 decode_setacl_maxsz)
731 #define NFS4_enc_fs_locations_sz \
732                                 (compound_encode_hdr_maxsz + \
733                                  encode_sequence_maxsz + \
734                                  encode_putfh_maxsz + \
735                                  encode_lookup_maxsz + \
736                                  encode_fs_locations_maxsz + \
737                                  encode_renew_maxsz)
738 #define NFS4_dec_fs_locations_sz \
739                                 (compound_decode_hdr_maxsz + \
740                                  decode_sequence_maxsz + \
741                                  decode_putfh_maxsz + \
742                                  decode_lookup_maxsz + \
743                                  decode_fs_locations_maxsz + \
744                                  decode_renew_maxsz)
745 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
746                                 encode_sequence_maxsz + \
747                                 encode_putfh_maxsz + \
748                                 encode_secinfo_maxsz)
749 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
750                                 decode_sequence_maxsz + \
751                                 decode_putfh_maxsz + \
752                                 decode_secinfo_maxsz)
753 #define NFS4_enc_fsid_present_sz \
754                                 (compound_encode_hdr_maxsz + \
755                                  encode_sequence_maxsz + \
756                                  encode_putfh_maxsz + \
757                                  encode_getfh_maxsz + \
758                                  encode_renew_maxsz)
759 #define NFS4_dec_fsid_present_sz \
760                                 (compound_decode_hdr_maxsz + \
761                                  decode_sequence_maxsz + \
762                                  decode_putfh_maxsz + \
763                                  decode_getfh_maxsz + \
764                                  decode_renew_maxsz)
765 #if defined(CONFIG_NFS_V4_1)
766 #define NFS4_enc_bind_conn_to_session_sz \
767                                 (compound_encode_hdr_maxsz + \
768                                  encode_bind_conn_to_session_maxsz)
769 #define NFS4_dec_bind_conn_to_session_sz \
770                                 (compound_decode_hdr_maxsz + \
771                                  decode_bind_conn_to_session_maxsz)
772 #define NFS4_enc_exchange_id_sz \
773                                 (compound_encode_hdr_maxsz + \
774                                  encode_exchange_id_maxsz)
775 #define NFS4_dec_exchange_id_sz \
776                                 (compound_decode_hdr_maxsz + \
777                                  decode_exchange_id_maxsz)
778 #define NFS4_enc_create_session_sz \
779                                 (compound_encode_hdr_maxsz + \
780                                  encode_create_session_maxsz)
781 #define NFS4_dec_create_session_sz \
782                                 (compound_decode_hdr_maxsz + \
783                                  decode_create_session_maxsz)
784 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
785                                          encode_destroy_session_maxsz)
786 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
787                                          decode_destroy_session_maxsz)
788 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
789                                          encode_destroy_clientid_maxsz)
790 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
791                                          decode_destroy_clientid_maxsz)
792 #define NFS4_enc_sequence_sz \
793                                 (compound_decode_hdr_maxsz + \
794                                  encode_sequence_maxsz)
795 #define NFS4_dec_sequence_sz \
796                                 (compound_decode_hdr_maxsz + \
797                                  decode_sequence_maxsz)
798 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
799                                          encode_sequence_maxsz + \
800                                          encode_putrootfh_maxsz + \
801                                          encode_fsinfo_maxsz)
802 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
803                                          decode_sequence_maxsz + \
804                                          decode_putrootfh_maxsz + \
805                                          decode_fsinfo_maxsz)
806 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
807                                          encode_sequence_maxsz + \
808                                          encode_reclaim_complete_maxsz)
809 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
810                                          decode_sequence_maxsz + \
811                                          decode_reclaim_complete_maxsz)
812 #define NFS4_enc_getdevicelist_sz (compound_encode_hdr_maxsz + \
813                                 encode_sequence_maxsz + \
814                                 encode_putfh_maxsz + \
815                                 encode_getdevicelist_maxsz)
816 #define NFS4_dec_getdevicelist_sz (compound_decode_hdr_maxsz + \
817                                 decode_sequence_maxsz + \
818                                 decode_putfh_maxsz + \
819                                 decode_getdevicelist_maxsz)
820 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
821                                 encode_sequence_maxsz +\
822                                 encode_getdeviceinfo_maxsz)
823 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
824                                 decode_sequence_maxsz + \
825                                 decode_getdeviceinfo_maxsz)
826 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
827                                 encode_sequence_maxsz + \
828                                 encode_putfh_maxsz +        \
829                                 encode_layoutget_maxsz)
830 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
831                                 decode_sequence_maxsz + \
832                                 decode_putfh_maxsz +        \
833                                 decode_layoutget_maxsz)
834 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
835                                 encode_sequence_maxsz +\
836                                 encode_putfh_maxsz + \
837                                 encode_layoutcommit_maxsz + \
838                                 encode_getattr_maxsz)
839 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
840                                 decode_sequence_maxsz + \
841                                 decode_putfh_maxsz + \
842                                 decode_layoutcommit_maxsz + \
843                                 decode_getattr_maxsz)
844 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
845                                 encode_sequence_maxsz + \
846                                 encode_putfh_maxsz + \
847                                 encode_layoutreturn_maxsz)
848 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
849                                 decode_sequence_maxsz + \
850                                 decode_putfh_maxsz + \
851                                 decode_layoutreturn_maxsz)
852 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
853                                         encode_sequence_maxsz + \
854                                         encode_putrootfh_maxsz +\
855                                         encode_secinfo_no_name_maxsz)
856 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
857                                         decode_sequence_maxsz + \
858                                         decode_putrootfh_maxsz + \
859                                         decode_secinfo_no_name_maxsz)
860 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
861                                          encode_sequence_maxsz + \
862                                          encode_test_stateid_maxsz)
863 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
864                                          decode_sequence_maxsz + \
865                                          decode_test_stateid_maxsz)
866 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
867                                          encode_sequence_maxsz + \
868                                          encode_free_stateid_maxsz)
869 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
870                                          decode_sequence_maxsz + \
871                                          decode_free_stateid_maxsz)
872 
873 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
874                                       compound_encode_hdr_maxsz +
875                                       encode_sequence_maxsz +
876                                       encode_putfh_maxsz +
877                                       encode_getattr_maxsz) *
878                                      XDR_UNIT);
879 
880 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
881                                      compound_decode_hdr_maxsz +
882                                      decode_sequence_maxsz +
883                                      decode_putfh_maxsz) *
884                                     XDR_UNIT);
885 
886 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
887                                            compound_decode_hdr_maxsz +
888                                            decode_sequence_maxsz) *
889                                           XDR_UNIT);
890 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
891 #endif /* CONFIG_NFS_V4_1 */
892 
893 static const umode_t nfs_type2fmt[] = {
894         [NF4BAD] = 0,
895         [NF4REG] = S_IFREG,
896         [NF4DIR] = S_IFDIR,
897         [NF4BLK] = S_IFBLK,
898         [NF4CHR] = S_IFCHR,
899         [NF4LNK] = S_IFLNK,
900         [NF4SOCK] = S_IFSOCK,
901         [NF4FIFO] = S_IFIFO,
902         [NF4ATTRDIR] = 0,
903         [NF4NAMEDATTR] = 0,
904 };
905 
906 struct compound_hdr {
907         int32_t         status;
908         uint32_t        nops;
909         __be32 *        nops_p;
910         uint32_t        taglen;
911         char *          tag;
912         uint32_t        replen;         /* expected reply words */
913         u32             minorversion;
914 };
915 
916 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
917 {
918         __be32 *p = xdr_reserve_space(xdr, nbytes);
919         BUG_ON(!p);
920         return p;
921 }
922 
923 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
924 {
925         __be32 *p;
926 
927         p = xdr_reserve_space(xdr, len);
928         xdr_encode_opaque_fixed(p, buf, len);
929 }
930 
931 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
932 {
933         __be32 *p;
934 
935         p = reserve_space(xdr, 4 + len);
936         xdr_encode_opaque(p, str, len);
937 }
938 
939 static void encode_uint32(struct xdr_stream *xdr, u32 n)
940 {
941         __be32 *p;
942 
943         p = reserve_space(xdr, 4);
944         *p = cpu_to_be32(n);
945 }
946 
947 static void encode_uint64(struct xdr_stream *xdr, u64 n)
948 {
949         __be32 *p;
950 
951         p = reserve_space(xdr, 8);
952         xdr_encode_hyper(p, n);
953 }
954 
955 static void encode_nfs4_seqid(struct xdr_stream *xdr,
956                 const struct nfs_seqid *seqid)
957 {
958         encode_uint32(xdr, seqid->sequence->counter);
959 }
960 
961 static void encode_compound_hdr(struct xdr_stream *xdr,
962                                 struct rpc_rqst *req,
963                                 struct compound_hdr *hdr)
964 {
965         __be32 *p;
966         struct rpc_auth *auth = req->rq_cred->cr_auth;
967 
968         /* initialize running count of expected bytes in reply.
969          * NOTE: the replied tag SHOULD be the same is the one sent,
970          * but this is not required as a MUST for the server to do so. */
971         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
972 
973         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
974         encode_string(xdr, hdr->taglen, hdr->tag);
975         p = reserve_space(xdr, 8);
976         *p++ = cpu_to_be32(hdr->minorversion);
977         hdr->nops_p = p;
978         *p = cpu_to_be32(hdr->nops);
979 }
980 
981 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
982                 uint32_t replen,
983                 struct compound_hdr *hdr)
984 {
985         encode_uint32(xdr, op);
986         hdr->nops++;
987         hdr->replen += replen;
988 }
989 
990 static void encode_nops(struct compound_hdr *hdr)
991 {
992         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
993         *hdr->nops_p = htonl(hdr->nops);
994 }
995 
996 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
997 {
998         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
999 }
1000 
1001 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
1002 {
1003         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1004 }
1005 
1006 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1007                                 const struct nfs4_label *label,
1008                                 const struct nfs_server *server)
1009 {
1010         char owner_name[IDMAP_NAMESZ];
1011         char owner_group[IDMAP_NAMESZ];
1012         int owner_namelen = 0;
1013         int owner_grouplen = 0;
1014         __be32 *p;
1015         unsigned i;
1016         uint32_t len = 0;
1017         uint32_t bmval_len;
1018         uint32_t bmval[3] = { 0 };
1019 
1020         /*
1021          * We reserve enough space to write the entire attribute buffer at once.
1022          * In the worst-case, this would be
1023          * 16(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
1024          * = 40 bytes, plus any contribution from variable-length fields
1025          *            such as owner/group.
1026          */
1027         if (iap->ia_valid & ATTR_SIZE) {
1028                 bmval[0] |= FATTR4_WORD0_SIZE;
1029                 len += 8;
1030         }
1031         if (iap->ia_valid & ATTR_MODE) {
1032                 bmval[1] |= FATTR4_WORD1_MODE;
1033                 len += 4;
1034         }
1035         if (iap->ia_valid & ATTR_UID) {
1036                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1037                 if (owner_namelen < 0) {
1038                         dprintk("nfs: couldn't resolve uid %d to string\n",
1039                                         from_kuid(&init_user_ns, iap->ia_uid));
1040                         /* XXX */
1041                         strcpy(owner_name, "nobody");
1042                         owner_namelen = sizeof("nobody") - 1;
1043                         /* goto out; */
1044                 }
1045                 bmval[1] |= FATTR4_WORD1_OWNER;
1046                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1047         }
1048         if (iap->ia_valid & ATTR_GID) {
1049                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1050                 if (owner_grouplen < 0) {
1051                         dprintk("nfs: couldn't resolve gid %d to string\n",
1052                                         from_kgid(&init_user_ns, iap->ia_gid));
1053                         strcpy(owner_group, "nobody");
1054                         owner_grouplen = sizeof("nobody") - 1;
1055                         /* goto out; */
1056                 }
1057                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1058                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1059         }
1060         if (iap->ia_valid & ATTR_ATIME_SET) {
1061                 bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1062                 len += 16;
1063         } else if (iap->ia_valid & ATTR_ATIME) {
1064                 bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1065                 len += 4;
1066         }
1067         if (iap->ia_valid & ATTR_MTIME_SET) {
1068                 bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1069                 len += 16;
1070         } else if (iap->ia_valid & ATTR_MTIME) {
1071                 bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1072                 len += 4;
1073         }
1074         if (label) {
1075                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1076                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1077         }
1078 
1079         if (bmval[2] != 0)
1080                 bmval_len = 3;
1081         else if (bmval[1] != 0)
1082                 bmval_len = 2;
1083         else
1084                 bmval_len = 1;
1085 
1086         p = reserve_space(xdr, 4 + (bmval_len << 2) + 4 + len);
1087 
1088         *p++ = cpu_to_be32(bmval_len);
1089         for (i = 0; i < bmval_len; i++)
1090                 *p++ = cpu_to_be32(bmval[i]);
1091         *p++ = cpu_to_be32(len);
1092 
1093         if (bmval[0] & FATTR4_WORD0_SIZE)
1094                 p = xdr_encode_hyper(p, iap->ia_size);
1095         if (bmval[1] & FATTR4_WORD1_MODE)
1096                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1097         if (bmval[1] & FATTR4_WORD1_OWNER)
1098                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1099         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1100                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1101         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1102                 if (iap->ia_valid & ATTR_ATIME_SET) {
1103                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1104                         p = xdr_encode_hyper(p, (s64)iap->ia_atime.tv_sec);
1105                         *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
1106                 } else
1107                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1108         }
1109         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1110                 if (iap->ia_valid & ATTR_MTIME_SET) {
1111                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1112                         p = xdr_encode_hyper(p, (s64)iap->ia_mtime.tv_sec);
1113                         *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
1114                 } else
1115                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1116         }
1117         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
1118                 *p++ = cpu_to_be32(label->lfs);
1119                 *p++ = cpu_to_be32(label->pi);
1120                 *p++ = cpu_to_be32(label->len);
1121                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1122         }
1123 
1124 /* out: */
1125 }
1126 
1127 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1128 {
1129         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1130         encode_uint32(xdr, access);
1131 }
1132 
1133 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1134 {
1135         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1136         encode_nfs4_seqid(xdr, arg->seqid);
1137         encode_nfs4_stateid(xdr, arg->stateid);
1138 }
1139 
1140 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1141 {
1142         __be32 *p;
1143 
1144         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1145         p = reserve_space(xdr, 12);
1146         p = xdr_encode_hyper(p, args->offset);
1147         *p = cpu_to_be32(args->count);
1148 }
1149 
1150 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1151 {
1152         __be32 *p;
1153 
1154         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1155         encode_uint32(xdr, create->ftype);
1156 
1157         switch (create->ftype) {
1158         case NF4LNK:
1159                 p = reserve_space(xdr, 4);
1160                 *p = cpu_to_be32(create->u.symlink.len);
1161                 xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
1162                 break;
1163 
1164         case NF4BLK: case NF4CHR:
1165                 p = reserve_space(xdr, 8);
1166                 *p++ = cpu_to_be32(create->u.device.specdata1);
1167                 *p = cpu_to_be32(create->u.device.specdata2);
1168                 break;
1169 
1170         default:
1171                 break;
1172         }
1173 
1174         encode_string(xdr, create->name->len, create->name->name);
1175         encode_attrs(xdr, create->attrs, create->label, create->server);
1176 }
1177 
1178 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
1179 {
1180         __be32 *p;
1181 
1182         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1183         p = reserve_space(xdr, 8);
1184         *p++ = cpu_to_be32(1);
1185         *p = cpu_to_be32(bitmap);
1186 }
1187 
1188 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
1189 {
1190         __be32 *p;
1191 
1192         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1193         p = reserve_space(xdr, 12);
1194         *p++ = cpu_to_be32(2);
1195         *p++ = cpu_to_be32(bm0);
1196         *p = cpu_to_be32(bm1);
1197 }
1198 
1199 static void
1200 encode_getattr_three(struct xdr_stream *xdr,
1201                      uint32_t bm0, uint32_t bm1, uint32_t bm2,
1202                      struct compound_hdr *hdr)
1203 {
1204         __be32 *p;
1205 
1206         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1207         if (bm2) {
1208                 p = reserve_space(xdr, 16);
1209                 *p++ = cpu_to_be32(3);
1210                 *p++ = cpu_to_be32(bm0);
1211                 *p++ = cpu_to_be32(bm1);
1212                 *p = cpu_to_be32(bm2);
1213         } else if (bm1) {
1214                 p = reserve_space(xdr, 12);
1215                 *p++ = cpu_to_be32(2);
1216                 *p++ = cpu_to_be32(bm0);
1217                 *p = cpu_to_be32(bm1);
1218         } else {
1219                 p = reserve_space(xdr, 8);
1220                 *p++ = cpu_to_be32(1);
1221                 *p = cpu_to_be32(bm0);
1222         }
1223 }
1224 
1225 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1226 {
1227         encode_getattr_three(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1228                            bitmask[1] & nfs4_fattr_bitmap[1],
1229                            bitmask[2] & nfs4_fattr_bitmap[2],
1230                            hdr);
1231 }
1232 
1233 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1234                                  const u32 *open_bitmap,
1235                                  struct compound_hdr *hdr)
1236 {
1237         encode_getattr_three(xdr,
1238                              bitmask[0] & open_bitmap[0],
1239                              bitmask[1] & open_bitmap[1],
1240                              bitmask[2] & open_bitmap[2],
1241                              hdr);
1242 }
1243 
1244 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1245 {
1246         encode_getattr_three(xdr,
1247                              bitmask[0] & nfs4_fsinfo_bitmap[0],
1248                              bitmask[1] & nfs4_fsinfo_bitmap[1],
1249                              bitmask[2] & nfs4_fsinfo_bitmap[2],
1250                              hdr);
1251 }
1252 
1253 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1254 {
1255         encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1256                            bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1257 }
1258 
1259 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1260 {
1261         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1262 }
1263 
1264 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1265 {
1266         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1267         encode_string(xdr, name->len, name->name);
1268 }
1269 
1270 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1271 {
1272         if (fl->fl_type == F_RDLCK)
1273                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1274         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1275 }
1276 
1277 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1278 {
1279         if (fl->fl_end == OFFSET_MAX)
1280                 return ~(uint64_t)0;
1281         return fl->fl_end - fl->fl_start + 1;
1282 }
1283 
1284 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1285 {
1286         __be32 *p;
1287 
1288         p = reserve_space(xdr, 32);
1289         p = xdr_encode_hyper(p, lowner->clientid);
1290         *p++ = cpu_to_be32(20);
1291         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1292         *p++ = cpu_to_be32(lowner->s_dev);
1293         xdr_encode_hyper(p, lowner->id);
1294 }
1295 
1296 /*
1297  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1298  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1299  */
1300 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1301 {
1302         __be32 *p;
1303 
1304         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1305         p = reserve_space(xdr, 28);
1306         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1307         *p++ = cpu_to_be32(args->reclaim);
1308         p = xdr_encode_hyper(p, args->fl->fl_start);
1309         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1310         *p = cpu_to_be32(args->new_lock_owner);
1311         if (args->new_lock_owner){
1312                 encode_nfs4_seqid(xdr, args->open_seqid);
1313                 encode_nfs4_stateid(xdr, args->open_stateid);
1314                 encode_nfs4_seqid(xdr, args->lock_seqid);
1315                 encode_lockowner(xdr, &args->lock_owner);
1316         }
1317         else {
1318                 encode_nfs4_stateid(xdr, args->lock_stateid);
1319                 encode_nfs4_seqid(xdr, args->lock_seqid);
1320         }
1321 }
1322 
1323 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1324 {
1325         __be32 *p;
1326 
1327         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1328         p = reserve_space(xdr, 20);
1329         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1330         p = xdr_encode_hyper(p, args->fl->fl_start);
1331         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1332         encode_lockowner(xdr, &args->lock_owner);
1333 }
1334 
1335 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1336 {
1337         __be32 *p;
1338 
1339         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1340         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1341         encode_nfs4_seqid(xdr, args->seqid);
1342         encode_nfs4_stateid(xdr, args->stateid);
1343         p = reserve_space(xdr, 16);
1344         p = xdr_encode_hyper(p, args->fl->fl_start);
1345         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1346 }
1347 
1348 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1349 {
1350         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1351         encode_lockowner(xdr, lowner);
1352 }
1353 
1354 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1355 {
1356         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1357         encode_string(xdr, name->len, name->name);
1358 }
1359 
1360 static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
1361 {
1362         __be32 *p;
1363 
1364         p = reserve_space(xdr, 8);
1365         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1366         case FMODE_READ:
1367                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
1368                 break;
1369         case FMODE_WRITE:
1370                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
1371                 break;
1372         case FMODE_READ|FMODE_WRITE:
1373                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
1374                 break;
1375         default:
1376                 *p++ = cpu_to_be32(0);
1377         }
1378         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1379 }
1380 
1381 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1382 {
1383         __be32 *p;
1384  /*
1385  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1386  * owner 4 = 32
1387  */
1388         encode_nfs4_seqid(xdr, arg->seqid);
1389         encode_share_access(xdr, arg->fmode);
1390         p = reserve_space(xdr, 36);
1391         p = xdr_encode_hyper(p, arg->clientid);
1392         *p++ = cpu_to_be32(24);
1393         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1394         *p++ = cpu_to_be32(arg->server->s_dev);
1395         *p++ = cpu_to_be32(arg->id.uniquifier);
1396         xdr_encode_hyper(p, arg->id.create_time);
1397 }
1398 
1399 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1400 {
1401         struct iattr dummy;
1402         __be32 *p;
1403 
1404         p = reserve_space(xdr, 4);
1405         switch(arg->createmode) {
1406         case NFS4_CREATE_UNCHECKED:
1407                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1408                 encode_attrs(xdr, arg->u.attrs, arg->label, arg->server);
1409                 break;
1410         case NFS4_CREATE_GUARDED:
1411                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1412                 encode_attrs(xdr, arg->u.attrs, arg->label, arg->server);
1413                 break;
1414         case NFS4_CREATE_EXCLUSIVE:
1415                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1416                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1417                 break;
1418         case NFS4_CREATE_EXCLUSIVE4_1:
1419                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1420                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1421                 dummy.ia_valid = 0;
1422                 encode_attrs(xdr, &dummy, arg->label, arg->server);
1423         }
1424 }
1425 
1426 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1427 {
1428         __be32 *p;
1429 
1430         p = reserve_space(xdr, 4);
1431         switch (arg->open_flags & O_CREAT) {
1432         case 0:
1433                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1434                 break;
1435         default:
1436                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1437                 encode_createmode(xdr, arg);
1438         }
1439 }
1440 
1441 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1442 {
1443         __be32 *p;
1444 
1445         p = reserve_space(xdr, 4);
1446         switch (delegation_type) {
1447         case 0:
1448                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1449                 break;
1450         case FMODE_READ:
1451                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1452                 break;
1453         case FMODE_WRITE|FMODE_READ:
1454                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1455                 break;
1456         default:
1457                 BUG();
1458         }
1459 }
1460 
1461 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1462 {
1463         __be32 *p;
1464 
1465         p = reserve_space(xdr, 4);
1466         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1467         encode_string(xdr, name->len, name->name);
1468 }
1469 
1470 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1471 {
1472         __be32 *p;
1473 
1474         p = reserve_space(xdr, 4);
1475         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1476         encode_delegation_type(xdr, type);
1477 }
1478 
1479 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1480 {
1481         __be32 *p;
1482 
1483         p = reserve_space(xdr, 4);
1484         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1485         encode_nfs4_stateid(xdr, stateid);
1486         encode_string(xdr, name->len, name->name);
1487 }
1488 
1489 static inline void encode_claim_fh(struct xdr_stream *xdr)
1490 {
1491         __be32 *p;
1492 
1493         p = reserve_space(xdr, 4);
1494         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1495 }
1496 
1497 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1498 {
1499         __be32 *p;
1500 
1501         p = reserve_space(xdr, 4);
1502         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1503         encode_nfs4_stateid(xdr, stateid);
1504 }
1505 
1506 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1507 {
1508         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1509         encode_openhdr(xdr, arg);
1510         encode_opentype(xdr, arg);
1511         switch (arg->claim) {
1512         case NFS4_OPEN_CLAIM_NULL:
1513                 encode_claim_null(xdr, arg->name);
1514                 break;
1515         case NFS4_OPEN_CLAIM_PREVIOUS:
1516                 encode_claim_previous(xdr, arg->u.delegation_type);
1517                 break;
1518         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1519                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1520                 break;
1521         case NFS4_OPEN_CLAIM_FH:
1522                 encode_claim_fh(xdr);
1523                 break;
1524         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1525                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1526                 break;
1527         default:
1528                 BUG();
1529         }
1530 }
1531 
1532 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1533 {
1534         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1535         encode_nfs4_stateid(xdr, arg->stateid);
1536         encode_nfs4_seqid(xdr, arg->seqid);
1537 }
1538 
1539 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1540 {
1541         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1542         encode_nfs4_stateid(xdr, arg->stateid);
1543         encode_nfs4_seqid(xdr, arg->seqid);
1544         encode_share_access(xdr, arg->fmode);
1545 }
1546 
1547 static void
1548 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1549 {
1550         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1551         encode_string(xdr, fh->size, fh->data);
1552 }
1553 
1554 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1555 {
1556         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1557 }
1558 
1559 static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
1560 {
1561         __be32 *p;
1562 
1563         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1564         encode_nfs4_stateid(xdr, &args->stateid);
1565 
1566         p = reserve_space(xdr, 12);
1567         p = xdr_encode_hyper(p, args->offset);
1568         *p = cpu_to_be32(args->count);
1569 }
1570 
1571 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1572 {
1573         uint32_t attrs[3] = {
1574                 FATTR4_WORD0_RDATTR_ERROR,
1575                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1576         };
1577         uint32_t dircount = readdir->count >> 1;
1578         __be32 *p, verf[2];
1579         uint32_t attrlen = 0;
1580         unsigned int i;
1581 
1582         if (readdir->plus) {
1583                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1584                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1585                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1586                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1587                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1588                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1589                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1590                 dircount >>= 1;
1591         }
1592         /* Use mounted_on_fileid only if the server supports it */
1593         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1594                 attrs[0] |= FATTR4_WORD0_FILEID;
1595         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1596                 attrs[i] &= readdir->bitmask[i];
1597                 if (attrs[i] != 0)
1598                         attrlen = i+1;
1599         }
1600 
1601         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1602         encode_uint64(xdr, readdir->cookie);
1603         encode_nfs4_verifier(xdr, &readdir->verifier);
1604         p = reserve_space(xdr, 12 + (attrlen << 2));
1605         *p++ = cpu_to_be32(dircount);
1606         *p++ = cpu_to_be32(readdir->count);
1607         *p++ = cpu_to_be32(attrlen);
1608         for (i = 0; i < attrlen; i++)
1609                 *p++ = cpu_to_be32(attrs[i]);
1610         memcpy(verf, readdir->verifier.data, sizeof(verf));
1611 
1612         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1613                         __func__,
1614                         (unsigned long long)readdir->cookie,
1615                         verf[0], verf[1],
1616                         attrs[0] & readdir->bitmask[0],
1617                         attrs[1] & readdir->bitmask[1],
1618                         attrs[2] & readdir->bitmask[2]);
1619 }
1620 
1621 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1622 {
1623         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1624 }
1625 
1626 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1627 {
1628         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1629         encode_string(xdr, name->len, name->name);
1630 }
1631 
1632 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1633 {
1634         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1635         encode_string(xdr, oldname->len, oldname->name);
1636         encode_string(xdr, newname->len, newname->name);
1637 }
1638 
1639 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1640                          struct compound_hdr *hdr)
1641 {
1642         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1643         encode_uint64(xdr, clid);
1644 }
1645 
1646 static void
1647 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1648 {
1649         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1650 }
1651 
1652 static void
1653 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1654 {
1655         __be32 *p;
1656 
1657         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1658         encode_nfs4_stateid(xdr, &zero_stateid);
1659         p = reserve_space(xdr, 2*4);
1660         *p++ = cpu_to_be32(1);
1661         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1662         p = reserve_space(xdr, 4);
1663         *p = cpu_to_be32(arg->acl_len);
1664         xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1665 }
1666 
1667 static void
1668 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1669 {
1670         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1671 }
1672 
1673 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1674 {
1675         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1676         encode_nfs4_stateid(xdr, &arg->stateid);
1677         encode_attrs(xdr, arg->iap, arg->label, server);
1678 }
1679 
1680 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1681 {
1682         __be32 *p;
1683 
1684         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1685         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1686 
1687         encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1688         p = reserve_space(xdr, 4);
1689         *p = cpu_to_be32(setclientid->sc_prog);
1690         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1691         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1692         p = reserve_space(xdr, 4);
1693         *p = cpu_to_be32(setclientid->sc_cb_ident);
1694 }
1695 
1696 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1697 {
1698         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1699                         decode_setclientid_confirm_maxsz, hdr);
1700         encode_uint64(xdr, arg->clientid);
1701         encode_nfs4_verifier(xdr, &arg->confirm);
1702 }
1703 
1704 static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1705 {
1706         __be32 *p;
1707 
1708         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1709         encode_nfs4_stateid(xdr, &args->stateid);
1710 
1711         p = reserve_space(xdr, 16);
1712         p = xdr_encode_hyper(p, args->offset);
1713         *p++ = cpu_to_be32(args->stable);
1714         *p = cpu_to_be32(args->count);
1715 
1716         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1717 }
1718 
1719 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1720 {
1721         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1722         encode_nfs4_stateid(xdr, stateid);
1723 }
1724 
1725 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1726 {
1727         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1728         encode_string(xdr, name->len, name->name);
1729 }
1730 
1731 #if defined(CONFIG_NFS_V4_1)
1732 /* NFSv4.1 operations */
1733 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1734                                    struct nfs4_session *session,
1735                                    struct compound_hdr *hdr)
1736 {
1737         __be32 *p;
1738 
1739         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1740                 decode_bind_conn_to_session_maxsz, hdr);
1741         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1742         p = xdr_reserve_space(xdr, 8);
1743         *p++ = cpu_to_be32(NFS4_CDFC4_BACK_OR_BOTH);
1744         *p = 0; /* use_conn_in_rdma_mode = False */
1745 }
1746 
1747 static void encode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
1748 {
1749         unsigned int i;
1750         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1751         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1752                 encode_uint32(xdr, op_map->u.words[i]);
1753 }
1754 
1755 static void encode_exchange_id(struct xdr_stream *xdr,
1756                                struct nfs41_exchange_id_args *args,
1757                                struct compound_hdr *hdr)
1758 {
1759         __be32 *p;
1760         char impl_name[IMPL_NAME_LIMIT];
1761         int len = 0;
1762 
1763         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1764         encode_nfs4_verifier(xdr, args->verifier);
1765 
1766         encode_string(xdr, args->id_len, args->id);
1767 
1768         encode_uint32(xdr, args->flags);
1769         encode_uint32(xdr, args->state_protect.how);
1770 
1771         switch (args->state_protect.how) {
1772         case SP4_NONE:
1773                 break;
1774         case SP4_MACH_CRED:
1775                 encode_op_map(xdr, &args->state_protect.enforce);
1776                 encode_op_map(xdr, &args->state_protect.allow);
1777                 break;
1778         default:
1779                 WARN_ON_ONCE(1);
1780                 break;
1781         }
1782 
1783         if (send_implementation_id &&
1784             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1785             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1786                 <= sizeof(impl_name) + 1)
1787                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1788                                utsname()->sysname, utsname()->release,
1789                                utsname()->version, utsname()->machine);
1790 
1791         if (len > 0) {
1792                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1793 
1794                 encode_string(xdr,
1795                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1796                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1797                 encode_string(xdr, len, impl_name);
1798                 /* just send zeros for nii_date - the date is in nii_name */
1799                 p = reserve_space(xdr, 12);
1800                 p = xdr_encode_hyper(p, 0);
1801                 *p = cpu_to_be32(0);
1802         } else
1803                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1804 }
1805 
1806 static void encode_create_session(struct xdr_stream *xdr,
1807                                   struct nfs41_create_session_args *args,
1808                                   struct compound_hdr *hdr)
1809 {
1810         __be32 *p;
1811         char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
1812         uint32_t len;
1813         struct nfs_client *clp = args->client;
1814         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1815         u32 max_resp_sz_cached;
1816 
1817         /*
1818          * Assumes OPEN is the biggest non-idempotent compound.
1819          * 2 is the verifier.
1820          */
1821         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1822                               RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1823 
1824         len = scnprintf(machine_name, sizeof(machine_name), "%s",
1825                         clp->cl_ipaddr);
1826 
1827         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1828         p = reserve_space(xdr, 16 + 2*28 + 20 + len + 12);
1829         p = xdr_encode_hyper(p, clp->cl_clientid);
1830         *p++ = cpu_to_be32(clp->cl_seqid);                      /*Sequence id */
1831         *p++ = cpu_to_be32(args->flags);                        /*flags */
1832 
1833         /* Fore Channel */
1834         *p++ = cpu_to_be32(0);                          /* header padding size */
1835         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1836         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1837         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1838         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1839         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1840         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1841 
1842         /* Back Channel */
1843         *p++ = cpu_to_be32(0);                          /* header padding size */
1844         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1845         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1846         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1847         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1848         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1849         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1850 
1851         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1852         *p++ = cpu_to_be32(1);
1853         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1854 
1855         /* authsys_parms rfc1831 */
1856         *p++ = cpu_to_be32(nn->boot_time.tv_nsec);      /* stamp */
1857         p = xdr_encode_opaque(p, machine_name, len);
1858         *p++ = cpu_to_be32(0);                          /* UID */
1859         *p++ = cpu_to_be32(0);                          /* GID */
1860         *p = cpu_to_be32(0);                            /* No more gids */
1861 }
1862 
1863 static void encode_destroy_session(struct xdr_stream *xdr,
1864                                    struct nfs4_session *session,
1865                                    struct compound_hdr *hdr)
1866 {
1867         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1868         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1869 }
1870 
1871 static void encode_destroy_clientid(struct xdr_stream *xdr,
1872                                    uint64_t clientid,
1873                                    struct compound_hdr *hdr)
1874 {
1875         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1876         encode_uint64(xdr, clientid);
1877 }
1878 
1879 static void encode_reclaim_complete(struct xdr_stream *xdr,
1880                                     struct nfs41_reclaim_complete_args *args,
1881                                     struct compound_hdr *hdr)
1882 {
1883         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1884         encode_uint32(xdr, args->one_fs);
1885 }
1886 #endif /* CONFIG_NFS_V4_1 */
1887 
1888 static void encode_sequence(struct xdr_stream *xdr,
1889                             const struct nfs4_sequence_args *args,
1890                             struct compound_hdr *hdr)
1891 {
1892 #if defined(CONFIG_NFS_V4_1)
1893         struct nfs4_session *session;
1894         struct nfs4_slot_table *tp;
1895         struct nfs4_slot *slot = args->sa_slot;
1896         __be32 *p;
1897 
1898         tp = slot->table;
1899         session = tp->session;
1900         if (!session)
1901                 return;
1902 
1903         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1904 
1905         /*
1906          * Sessionid + seqid + slotid + max slotid + cache_this
1907          */
1908         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1909                 "max_slotid=%d cache_this=%d\n",
1910                 __func__,
1911                 ((u32 *)session->sess_id.data)[0],
1912                 ((u32 *)session->sess_id.data)[1],
1913                 ((u32 *)session->sess_id.data)[2],
1914                 ((u32 *)session->sess_id.data)[3],
1915                 slot->seq_nr, slot->slot_nr,
1916                 tp->highest_used_slotid, args->sa_cache_this);
1917         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1918         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1919         *p++ = cpu_to_be32(slot->seq_nr);
1920         *p++ = cpu_to_be32(slot->slot_nr);
1921         *p++ = cpu_to_be32(tp->highest_used_slotid);
1922         *p = cpu_to_be32(args->sa_cache_this);
1923 #endif /* CONFIG_NFS_V4_1 */
1924 }
1925 
1926 #ifdef CONFIG_NFS_V4_1
1927 static void
1928 encode_getdevicelist(struct xdr_stream *xdr,
1929                      const struct nfs4_getdevicelist_args *args,
1930                      struct compound_hdr *hdr)
1931 {
1932         __be32 *p;
1933         nfs4_verifier dummy = {
1934                 .data = "dummmmmy",
1935         };
1936 
1937         encode_op_hdr(xdr, OP_GETDEVICELIST, decode_getdevicelist_maxsz, hdr);
1938         p = reserve_space(xdr, 16);
1939         *p++ = cpu_to_be32(args->layoutclass);
1940         *p++ = cpu_to_be32(NFS4_PNFS_GETDEVLIST_MAXNUM);
1941         xdr_encode_hyper(p, 0ULL);                          /* cookie */
1942         encode_nfs4_verifier(xdr, &dummy);
1943 }
1944 
1945 static void
1946 encode_getdeviceinfo(struct xdr_stream *xdr,
1947                      const struct nfs4_getdeviceinfo_args *args,
1948                      struct compound_hdr *hdr)
1949 {
1950         __be32 *p;
1951 
1952         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1953         p = reserve_space(xdr, 12 + NFS4_DEVICEID4_SIZE);
1954         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1955                                     NFS4_DEVICEID4_SIZE);
1956         *p++ = cpu_to_be32(args->pdev->layout_type);
1957         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1958         *p++ = cpu_to_be32(0);                          /* bitmap length 0 */
1959 }
1960 
1961 static void
1962 encode_layoutget(struct xdr_stream *xdr,
1963                       const struct nfs4_layoutget_args *args,
1964                       struct compound_hdr *hdr)
1965 {
1966         __be32 *p;
1967 
1968         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1969         p = reserve_space(xdr, 36);
1970         *p++ = cpu_to_be32(0);     /* Signal layout available */
1971         *p++ = cpu_to_be32(args->type);
1972         *p++ = cpu_to_be32(args->range.iomode);
1973         p = xdr_encode_hyper(p, args->range.offset);
1974         p = xdr_encode_hyper(p, args->range.length);
1975         p = xdr_encode_hyper(p, args->minlength);
1976         encode_nfs4_stateid(xdr, &args->stateid);
1977         encode_uint32(xdr, args->maxcount);
1978 
1979         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1980                 __func__,
1981                 args->type,
1982                 args->range.iomode,
1983                 (unsigned long)args->range.offset,
1984                 (unsigned long)args->range.length,
1985                 args->maxcount);
1986 }
1987 
1988 static int
1989 encode_layoutcommit(struct xdr_stream *xdr,
1990                     struct inode *inode,
1991                     const struct nfs4_layoutcommit_args *args,
1992                     struct compound_hdr *hdr)
1993 {
1994         __be32 *p;
1995 
1996         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
1997                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
1998 
1999         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2000         p = reserve_space(xdr, 20);
2001         /* Only whole file layouts */
2002         p = xdr_encode_hyper(p, 0); /* offset */
2003         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
2004         *p = cpu_to_be32(0); /* reclaim */
2005         encode_nfs4_stateid(xdr, &args->stateid);
2006         p = reserve_space(xdr, 20);
2007         *p++ = cpu_to_be32(1); /* newoffset = TRUE */
2008         p = xdr_encode_hyper(p, args->lastbytewritten);
2009         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2010         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2011 
2012         if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
2013                 NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
2014                         NFS_I(inode)->layout, xdr, args);
2015         else
2016                 encode_uint32(xdr, 0); /* no layout-type payload */
2017 
2018         return 0;
2019 }
2020 
2021 static void
2022 encode_layoutreturn(struct xdr_stream *xdr,
2023                     const struct nfs4_layoutreturn_args *args,
2024                     struct compound_hdr *hdr)
2025 {
2026         __be32 *p;
2027 
2028         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2029         p = reserve_space(xdr, 16);
2030         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2031         *p++ = cpu_to_be32(args->layout_type);
2032         *p++ = cpu_to_be32(IOMODE_ANY);
2033         *p = cpu_to_be32(RETURN_FILE);
2034         p = reserve_space(xdr, 16);
2035         p = xdr_encode_hyper(p, 0);
2036         p = xdr_encode_hyper(p, NFS4_MAX_UINT64);
2037         spin_lock(&args->inode->i_lock);
2038         encode_nfs4_stateid(xdr, &args->stateid);
2039         spin_unlock(&args->inode->i_lock);
2040         if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
2041                 NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
2042                         NFS_I(args->inode)->layout, xdr, args);
2043         } else
2044                 encode_uint32(xdr, 0);
2045 }
2046 
2047 static int
2048 encode_secinfo_no_name(struct xdr_stream *xdr,
2049                        const struct nfs41_secinfo_no_name_args *args,
2050                        struct compound_hdr *hdr)
2051 {
2052         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2053         encode_uint32(xdr, args->style);
2054         return 0;
2055 }
2056 
2057 static void encode_test_stateid(struct xdr_stream *xdr,
2058                                 struct nfs41_test_stateid_args *args,
2059                                 struct compound_hdr *hdr)
2060 {
2061         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2062         encode_uint32(xdr, 1);
2063         encode_nfs4_stateid(xdr, args->stateid);
2064 }
2065 
2066 static void encode_free_stateid(struct xdr_stream *xdr,
2067                                 struct nfs41_free_stateid_args *args,
2068                                 struct compound_hdr *hdr)
2069 {
2070         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2071         encode_nfs4_stateid(xdr, &args->stateid);
2072 }
2073 #endif /* CONFIG_NFS_V4_1 */
2074 
2075 /*
2076  * END OF "GENERIC" ENCODE ROUTINES.
2077  */
2078 
2079 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2080 {
2081 #if defined(CONFIG_NFS_V4_1)
2082         struct nfs4_session *session = args->sa_slot->table->session;
2083         if (session)
2084                 return session->clp->cl_mvops->minor_version;
2085 #endif /* CONFIG_NFS_V4_1 */
2086         return 0;
2087 }
2088 
2089 /*
2090  * Encode an ACCESS request
2091  */
2092 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2093                                 const struct nfs4_accessargs *args)
2094 {
2095         struct compound_hdr hdr = {
2096                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2097         };
2098 
2099         encode_compound_hdr(xdr, req, &hdr);
2100         encode_sequence(xdr, &args->seq_args, &hdr);
2101         encode_putfh(xdr, args->fh, &hdr);
2102         encode_access(xdr, args->access, &hdr);
2103         encode_getfattr(xdr, args->bitmask, &hdr);
2104         encode_nops(&hdr);
2105 }
2106 
2107 /*
2108  * Encode LOOKUP request
2109  */
2110 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2111                                 const struct nfs4_lookup_arg *args)
2112 {
2113         struct compound_hdr hdr = {
2114                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2115         };
2116 
2117         encode_compound_hdr(xdr, req, &hdr);
2118         encode_sequence(xdr, &args->seq_args, &hdr);
2119         encode_putfh(xdr, args->dir_fh, &hdr);
2120         encode_lookup(xdr, args->name, &hdr);
2121         encode_getfh(xdr, &hdr);
2122         encode_getfattr(xdr, args->bitmask, &hdr);
2123         encode_nops(&hdr);
2124 }
2125 
2126 /*
2127  * Encode LOOKUP_ROOT request
2128  */
2129 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2130                                      struct xdr_stream *xdr,
2131                                      const struct nfs4_lookup_root_arg *args)
2132 {
2133         struct compound_hdr hdr = {
2134                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2135         };
2136 
2137         encode_compound_hdr(xdr, req, &hdr);
2138         encode_sequence(xdr, &args->seq_args, &hdr);
2139         encode_putrootfh(xdr, &hdr);
2140         encode_getfh(xdr, &hdr);
2141         encode_getfattr(xdr, args->bitmask, &hdr);
2142         encode_nops(&hdr);
2143 }
2144 
2145 /*
2146  * Encode REMOVE request
2147  */
2148 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2149                                 const struct nfs_removeargs *args)
2150 {
2151         struct compound_hdr hdr = {
2152                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2153         };
2154 
2155         encode_compound_hdr(xdr, req, &hdr);
2156         encode_sequence(xdr, &args->seq_args, &hdr);
2157         encode_putfh(xdr, args->fh, &hdr);
2158         encode_remove(xdr, &args->name, &hdr);
2159         encode_nops(&hdr);
2160 }
2161 
2162 /*
2163  * Encode RENAME request
2164  */
2165 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2166                                 const struct nfs_renameargs *args)
2167 {
2168         struct compound_hdr hdr = {
2169                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2170         };
2171 
2172         encode_compound_hdr(xdr, req, &hdr);
2173         encode_sequence(xdr, &args->seq_args, &hdr);
2174         encode_putfh(xdr, args->old_dir, &hdr);
2175         encode_savefh(xdr, &hdr);
2176         encode_putfh(xdr, args->new_dir, &hdr);
2177         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2178         encode_nops(&hdr);
2179 }
2180 
2181 /*
2182  * Encode LINK request
2183  */
2184 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2185                              const struct nfs4_link_arg *args)
2186 {
2187         struct compound_hdr hdr = {
2188                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2189         };
2190 
2191         encode_compound_hdr(xdr, req, &hdr);
2192         encode_sequence(xdr, &args->seq_args, &hdr);
2193         encode_putfh(xdr, args->fh, &hdr);
2194         encode_savefh(xdr, &hdr);
2195         encode_putfh(xdr, args->dir_fh, &hdr);
2196         encode_link(xdr, args->name, &hdr);
2197         encode_restorefh(xdr, &hdr);
2198         encode_getfattr(xdr, args->bitmask, &hdr);
2199         encode_nops(&hdr);
2200 }
2201 
2202 /*
2203  * Encode CREATE request
2204  */
2205 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2206                                 const struct nfs4_create_arg *args)
2207 {
2208         struct compound_hdr hdr = {
2209                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2210         };
2211 
2212         encode_compound_hdr(xdr, req, &hdr);
2213         encode_sequence(xdr, &args->seq_args, &hdr);
2214         encode_putfh(xdr, args->dir_fh, &hdr);
2215         encode_create(xdr, args, &hdr);
2216         encode_getfh(xdr, &hdr);
2217         encode_getfattr(xdr, args->bitmask, &hdr);
2218         encode_nops(&hdr);
2219 }
2220 
2221 /*
2222  * Encode SYMLINK request
2223  */
2224 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2225                                  const struct nfs4_create_arg *args)
2226 {
2227         nfs4_xdr_enc_create(req, xdr, args);
2228 }
2229 
2230 /*
2231  * Encode GETATTR request
2232  */
2233 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2234                                  const struct nfs4_getattr_arg *args)
2235 {
2236         struct compound_hdr hdr = {
2237                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2238         };
2239 
2240         encode_compound_hdr(xdr, req, &hdr);
2241         encode_sequence(xdr, &args->seq_args, &hdr);
2242         encode_putfh(xdr, args->fh, &hdr);
2243         encode_getfattr(xdr, args->bitmask, &hdr);
2244         encode_nops(&hdr);
2245 }
2246 
2247 /*
2248  * Encode a CLOSE request
2249  */
2250 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2251                                struct nfs_closeargs *args)
2252 {
2253         struct compound_hdr hdr = {
2254                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2255         };
2256 
2257         encode_compound_hdr(xdr, req, &hdr);
2258         encode_sequence(xdr, &args->seq_args, &hdr);
2259         encode_putfh(xdr, args->fh, &hdr);
2260         encode_close(xdr, args, &hdr);
2261         encode_getfattr(xdr, args->bitmask, &hdr);
2262         encode_nops(&hdr);
2263 }
2264 
2265 /*
2266  * Encode an OPEN request
2267  */
2268 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2269                               struct nfs_openargs *args)
2270 {
2271         struct compound_hdr hdr = {
2272                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2273         };
2274 
2275         encode_compound_hdr(xdr, req, &hdr);
2276         encode_sequence(xdr, &args->seq_args, &hdr);
2277         encode_putfh(xdr, args->fh, &hdr);
2278         encode_open(xdr, args, &hdr);
2279         encode_getfh(xdr, &hdr);
2280         if (args->access)
2281                 encode_access(xdr, args->access, &hdr);
2282         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2283         encode_nops(&hdr);
2284 }
2285 
2286 /*
2287  * Encode an OPEN_CONFIRM request
2288  */
2289 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2290                                       struct xdr_stream *xdr,
2291                                       struct nfs_open_confirmargs *args)
2292 {
2293         struct compound_hdr hdr = {
2294                 .nops   = 0,
2295         };
2296 
2297         encode_compound_hdr(xdr, req, &hdr);
2298         encode_putfh(xdr, args->fh, &hdr);
2299         encode_open_confirm(xdr, args, &hdr);
2300         encode_nops(&hdr);
2301 }
2302 
2303 /*
2304  * Encode an OPEN request with no attributes.
2305  */
2306 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2307                                      struct xdr_stream *xdr,
2308                                      struct nfs_openargs *args)
2309 {
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         encode_open(xdr, args, &hdr);
2318         if (args->access)
2319                 encode_access(xdr, args->access, &hdr);
2320         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2321         encode_nops(&hdr);
2322 }
2323 
2324 /*
2325  * Encode an OPEN_DOWNGRADE request
2326  */
2327 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2328                                         struct xdr_stream *xdr,
2329                                         struct nfs_closeargs *args)
2330 {
2331         struct compound_hdr hdr = {
2332                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2333         };
2334 
2335         encode_compound_hdr(xdr, req, &hdr);
2336         encode_sequence(xdr, &args->seq_args, &hdr);
2337         encode_putfh(xdr, args->fh, &hdr);
2338         encode_open_downgrade(xdr, args, &hdr);
2339         encode_getfattr(xdr, args->bitmask, &hdr);
2340         encode_nops(&hdr);
2341 }
2342 
2343 /*
2344  * Encode a LOCK request
2345  */
2346 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2347                               struct nfs_lock_args *args)
2348 {
2349         struct compound_hdr hdr = {
2350                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2351         };
2352 
2353         encode_compound_hdr(xdr, req, &hdr);
2354         encode_sequence(xdr, &args->seq_args, &hdr);
2355         encode_putfh(xdr, args->fh, &hdr);
2356         encode_lock(xdr, args, &hdr);
2357         encode_nops(&hdr);
2358 }
2359 
2360 /*
2361  * Encode a LOCKT request
2362  */
2363 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2364                                struct nfs_lockt_args *args)
2365 {
2366         struct compound_hdr hdr = {
2367                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2368         };
2369 
2370         encode_compound_hdr(xdr, req, &hdr);
2371         encode_sequence(xdr, &args->seq_args, &hdr);
2372         encode_putfh(xdr, args->fh, &hdr);
2373         encode_lockt(xdr, args, &hdr);
2374         encode_nops(&hdr);
2375 }
2376 
2377 /*
2378  * Encode a LOCKU request
2379  */
2380 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2381                                struct nfs_locku_args *args)
2382 {
2383         struct compound_hdr hdr = {
2384                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2385         };
2386 
2387         encode_compound_hdr(xdr, req, &hdr);
2388         encode_sequence(xdr, &args->seq_args, &hdr);
2389         encode_putfh(xdr, args->fh, &hdr);
2390         encode_locku(xdr, args, &hdr);
2391         encode_nops(&hdr);
2392 }
2393 
2394 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2395                                            struct xdr_stream *xdr,
2396                                         struct nfs_release_lockowner_args *args)
2397 {
2398         struct compound_hdr hdr = {
2399                 .minorversion = 0,
2400         };
2401 
2402         encode_compound_hdr(xdr, req, &hdr);
2403         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2404         encode_nops(&hdr);
2405 }
2406 
2407 /*
2408  * Encode a READLINK request
2409  */
2410 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2411                                   const struct nfs4_readlink *args)
2412 {
2413         struct compound_hdr hdr = {
2414                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2415         };
2416 
2417         encode_compound_hdr(xdr, req, &hdr);
2418         encode_sequence(xdr, &args->seq_args, &hdr);
2419         encode_putfh(xdr, args->fh, &hdr);
2420         encode_readlink(xdr, args, req, &hdr);
2421 
2422         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2423                         args->pgbase, args->pglen);
2424         encode_nops(&hdr);
2425 }
2426 
2427 /*
2428  * Encode a READDIR request
2429  */
2430 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2431                                  const struct nfs4_readdir_arg *args)
2432 {
2433         struct compound_hdr hdr = {
2434                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2435         };
2436 
2437         encode_compound_hdr(xdr, req, &hdr);
2438         encode_sequence(xdr, &args->seq_args, &hdr);
2439         encode_putfh(xdr, args->fh, &hdr);
2440         encode_readdir(xdr, args, req, &hdr);
2441 
2442         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2443                          args->pgbase, args->count);
2444         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2445                         __func__, hdr.replen << 2, args->pages,
2446                         args->pgbase, args->count);
2447         encode_nops(&hdr);
2448 }
2449 
2450 /*
2451  * Encode a READ request
2452  */
2453 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2454                               struct nfs_readargs *args)
2455 {
2456         struct compound_hdr hdr = {
2457                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2458         };
2459 
2460         encode_compound_hdr(xdr, req, &hdr);
2461         encode_sequence(xdr, &args->seq_args, &hdr);
2462         encode_putfh(xdr, args->fh, &hdr);
2463         encode_read(xdr, args, &hdr);
2464 
2465         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2466                          args->pages, args->pgbase, args->count);
2467         req->rq_rcv_buf.flags |= XDRBUF_READ;
2468         encode_nops(&hdr);
2469 }
2470 
2471 /*
2472  * Encode an SETATTR request
2473  */
2474 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2475                                  struct nfs_setattrargs *args)
2476 {
2477         struct compound_hdr hdr = {
2478                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2479         };
2480 
2481         encode_compound_hdr(xdr, req, &hdr);
2482         encode_sequence(xdr, &args->seq_args, &hdr);
2483         encode_putfh(xdr, args->fh, &hdr);
2484         encode_setattr(xdr, args, args->server, &hdr);
2485         encode_getfattr(xdr, args->bitmask, &hdr);
2486         encode_nops(&hdr);
2487 }
2488 
2489 /*
2490  * Encode a GETACL request
2491  */
2492 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2493                                 struct nfs_getaclargs *args)
2494 {
2495         struct compound_hdr hdr = {
2496                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2497         };
2498         uint32_t replen;
2499 
2500         encode_compound_hdr(xdr, req, &hdr);
2501         encode_sequence(xdr, &args->seq_args, &hdr);
2502         encode_putfh(xdr, args->fh, &hdr);
2503         replen = hdr.replen + op_decode_hdr_maxsz + 1;
2504         encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
2505 
2506         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2507                 args->acl_pages, args->acl_pgbase, args->acl_len);
2508 
2509         encode_nops(&hdr);
2510 }
2511 
2512 /*
2513  * Encode a WRITE request
2514  */
2515 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2516                                struct nfs_writeargs *args)
2517 {
2518         struct compound_hdr hdr = {
2519                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2520         };
2521 
2522         encode_compound_hdr(xdr, req, &hdr);
2523         encode_sequence(xdr, &args->seq_args, &hdr);
2524         encode_putfh(xdr, args->fh, &hdr);
2525         encode_write(xdr, args, &hdr);
2526         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2527         if (args->bitmask)
2528                 encode_getfattr(xdr, args->bitmask, &hdr);
2529         encode_nops(&hdr);
2530 }
2531 
2532 /*
2533  *  a COMMIT request
2534  */
2535 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2536                                 struct nfs_commitargs *args)
2537 {
2538         struct compound_hdr hdr = {
2539                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2540         };
2541 
2542         encode_compound_hdr(xdr, req, &hdr);
2543         encode_sequence(xdr, &args->seq_args, &hdr);
2544         encode_putfh(xdr, args->fh, &hdr);
2545         encode_commit(xdr, args, &hdr);
2546         encode_nops(&hdr);
2547 }
2548 
2549 /*
2550  * FSINFO request
2551  */
2552 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2553                                 struct nfs4_fsinfo_arg *args)
2554 {
2555         struct compound_hdr hdr = {
2556                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2557         };
2558 
2559         encode_compound_hdr(xdr, req, &hdr);
2560         encode_sequence(xdr, &args->seq_args, &hdr);
2561         encode_putfh(xdr, args->fh, &hdr);
2562         encode_fsinfo(xdr, args->bitmask, &hdr);
2563         encode_nops(&hdr);
2564 }
2565 
2566 /*
2567  * a PATHCONF request
2568  */
2569 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2570                                   const struct nfs4_pathconf_arg *args)
2571 {
2572         struct compound_hdr hdr = {
2573                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2574         };
2575 
2576         encode_compound_hdr(xdr, req, &hdr);
2577         encode_sequence(xdr, &args->seq_args, &hdr);
2578         encode_putfh(xdr, args->fh, &hdr);
2579         encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2580                            &hdr);
2581         encode_nops(&hdr);
2582 }
2583 
2584 /*
2585  * a STATFS request
2586  */
2587 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2588                                 const struct nfs4_statfs_arg *args)
2589 {
2590         struct compound_hdr hdr = {
2591                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2592         };
2593 
2594         encode_compound_hdr(xdr, req, &hdr);
2595         encode_sequence(xdr, &args->seq_args, &hdr);
2596         encode_putfh(xdr, args->fh, &hdr);
2597         encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2598                            args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2599         encode_nops(&hdr);
2600 }
2601 
2602 /*
2603  * GETATTR_BITMAP request
2604  */
2605 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2606                                      struct xdr_stream *xdr,
2607                                      struct nfs4_server_caps_arg *args)
2608 {
2609         struct compound_hdr hdr = {
2610                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2611         };
2612 
2613         encode_compound_hdr(xdr, req, &hdr);
2614         encode_sequence(xdr, &args->seq_args, &hdr);
2615         encode_putfh(xdr, args->fhandle, &hdr);
2616         encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2617                            FATTR4_WORD0_FH_EXPIRE_TYPE|
2618                            FATTR4_WORD0_LINK_SUPPORT|
2619                            FATTR4_WORD0_SYMLINK_SUPPORT|
2620                            FATTR4_WORD0_ACLSUPPORT, &hdr);
2621         encode_nops(&hdr);
2622 }
2623 
2624 /*
2625  * a RENEW request
2626  */
2627 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2628                                struct nfs_client *clp)
2629 {
2630         struct compound_hdr hdr = {
2631                 .nops   = 0,
2632         };
2633 
2634         encode_compound_hdr(xdr, req, &hdr);
2635         encode_renew(xdr, clp->cl_clientid, &hdr);
2636         encode_nops(&hdr);
2637 }
2638 
2639 /*
2640  * a SETCLIENTID request
2641  */
2642 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2643                                      struct xdr_stream *xdr,
2644                                      struct nfs4_setclientid *sc)
2645 {
2646         struct compound_hdr hdr = {
2647                 .nops   = 0,
2648         };
2649 
2650         encode_compound_hdr(xdr, req, &hdr);
2651         encode_setclientid(xdr, sc, &hdr);
2652         encode_nops(&hdr);
2653 }
2654 
2655 /*
2656  * a SETCLIENTID_CONFIRM request
2657  */
2658 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2659                                              struct xdr_stream *xdr,
2660                                              struct nfs4_setclientid_res *arg)
2661 {
2662         struct compound_hdr hdr = {
2663                 .nops   = 0,
2664         };
2665 
2666         encode_compound_hdr(xdr, req, &hdr);
2667         encode_setclientid_confirm(xdr, arg, &hdr);
2668         encode_nops(&hdr);
2669 }
2670 
2671 /*
2672  * DELEGRETURN request
2673  */
2674 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2675                                      struct xdr_stream *xdr,
2676                                      const struct nfs4_delegreturnargs *args)
2677 {
2678         struct compound_hdr hdr = {
2679                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2680         };
2681 
2682         encode_compound_hdr(xdr, req, &hdr);
2683         encode_sequence(xdr, &args->seq_args, &hdr);
2684         encode_putfh(xdr, args->fhandle, &hdr);
2685         encode_getfattr(xdr, args->bitmask, &hdr);
2686         encode_delegreturn(xdr, args->stateid, &hdr);
2687         encode_nops(&hdr);
2688 }
2689 
2690 /*
2691  * Encode FS_LOCATIONS request
2692  */
2693 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2694                                       struct xdr_stream *xdr,
2695                                       struct nfs4_fs_locations_arg *args)
2696 {
2697         struct compound_hdr hdr = {
2698                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2699         };
2700         uint32_t replen;
2701 
2702         encode_compound_hdr(xdr, req, &hdr);
2703         encode_sequence(xdr, &args->seq_args, &hdr);
2704         if (args->migration) {
2705                 encode_putfh(xdr, args->fh, &hdr);
2706                 replen = hdr.replen;
2707                 encode_fs_locations(xdr, args->bitmask, &hdr);
2708                 if (args->renew)
2709                         encode_renew(xdr, args->clientid, &hdr);
2710         } else {
2711                 encode_putfh(xdr, args->dir_fh, &hdr);
2712                 encode_lookup(xdr, args->name, &hdr);
2713                 replen = hdr.replen;
2714                 encode_fs_locations(xdr, args->bitmask, &hdr);
2715         }
2716 
2717         /* Set up reply kvec to capture returned fs_locations array. */
2718         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2719                         0, PAGE_SIZE);
2720         encode_nops(&hdr);
2721 }
2722 
2723 /*
2724  * Encode SECINFO request
2725  */
2726 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2727                                 struct xdr_stream *xdr,
2728                                 struct nfs4_secinfo_arg *args)
2729 {
2730         struct compound_hdr hdr = {
2731                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2732         };
2733 
2734         encode_compound_hdr(xdr, req, &hdr);
2735         encode_sequence(xdr, &args->seq_args, &hdr);
2736         encode_putfh(xdr, args->dir_fh, &hdr);
2737         encode_secinfo(xdr, args->name, &hdr);
2738         encode_nops(&hdr);
2739 }
2740 
2741 /*
2742  * Encode FSID_PRESENT request
2743  */
2744 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2745                                       struct xdr_stream *xdr,
2746                                       struct nfs4_fsid_present_arg *args)
2747 {
2748         struct compound_hdr hdr = {
2749                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2750         };
2751 
2752         encode_compound_hdr(xdr, req, &hdr);
2753         encode_sequence(xdr, &args->seq_args, &hdr);
2754         encode_putfh(xdr, args->fh, &hdr);
2755         encode_getfh(xdr, &hdr);
2756         if (args->renew)
2757                 encode_renew(xdr, args->clientid, &hdr);
2758         encode_nops(&hdr);
2759 }
2760 
2761 #if defined(CONFIG_NFS_V4_1)
2762 /*
2763  * BIND_CONN_TO_SESSION request
2764  */
2765 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2766                                 struct xdr_stream *xdr,
2767                                 struct nfs_client *clp)
2768 {
2769         struct compound_hdr hdr = {
2770                 .minorversion = clp->cl_mvops->minor_version,
2771         };
2772 
2773         encode_compound_hdr(xdr, req, &hdr);
2774         encode_bind_conn_to_session(xdr, clp->cl_session, &hdr);
2775         encode_nops(&hdr);
2776 }
2777 
2778 /*
2779  * EXCHANGE_ID request
2780  */
2781 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2782                                      struct xdr_stream *xdr,
2783                                      struct nfs41_exchange_id_args *args)
2784 {
2785         struct compound_hdr hdr = {
2786                 .minorversion = args->client->cl_mvops->minor_version,
2787         };
2788 
2789         encode_compound_hdr(xdr, req, &hdr);
2790         encode_exchange_id(xdr, args, &hdr);
2791         encode_nops(&hdr);
2792 }
2793 
2794 /*
2795  * a CREATE_SESSION request
2796  */
2797 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2798                                         struct xdr_stream *xdr,
2799                                         struct nfs41_create_session_args *args)
2800 {
2801         struct compound_hdr hdr = {
2802                 .minorversion = args->client->cl_mvops->minor_version,
2803         };
2804 
2805         encode_compound_hdr(xdr, req, &hdr);
2806         encode_create_session(xdr, args, &hdr);
2807         encode_nops(&hdr);
2808 }
2809 
2810 /*
2811  * a DESTROY_SESSION request
2812  */
2813 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2814                                          struct xdr_stream *xdr,
2815                                          struct nfs4_session *session)
2816 {
2817         struct compound_hdr hdr = {
2818                 .minorversion = session->clp->cl_mvops->minor_version,
2819         };
2820 
2821         encode_compound_hdr(xdr, req, &hdr);
2822         encode_destroy_session(xdr, session, &hdr);
2823         encode_nops(&hdr);
2824 }
2825 
2826 /*
2827  * a DESTROY_CLIENTID request
2828  */
2829 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2830                                          struct xdr_stream *xdr,
2831                                          struct nfs_client *clp)
2832 {
2833         struct compound_hdr hdr = {
2834                 .minorversion = clp->cl_mvops->minor_version,
2835         };
2836 
2837         encode_compound_hdr(xdr, req, &hdr);
2838         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2839         encode_nops(&hdr);
2840 }
2841 
2842 /*
2843  * a SEQUENCE request
2844  */
2845 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2846                                   struct nfs4_sequence_args *args)
2847 {
2848         struct compound_hdr hdr = {
2849                 .minorversion = nfs4_xdr_minorversion(args),
2850         };
2851 
2852         encode_compound_hdr(xdr, req, &hdr);
2853         encode_sequence(xdr, args, &hdr);
2854         encode_nops(&hdr);
2855 }
2856 
2857 /*
2858  * a GET_LEASE_TIME request
2859  */
2860 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2861                                         struct xdr_stream *xdr,
2862                                         struct nfs4_get_lease_time_args *args)
2863 {
2864         struct compound_hdr hdr = {
2865                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2866         };
2867         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2868 
2869         encode_compound_hdr(xdr, req, &hdr);
2870         encode_sequence(xdr, &args->la_seq_args, &hdr);
2871         encode_putrootfh(xdr, &hdr);
2872         encode_fsinfo(xdr, lease_bitmap, &hdr);
2873         encode_nops(&hdr);
2874 }
2875 
2876 /*
2877  * a RECLAIM_COMPLETE request
2878  */
2879 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2880                                           struct xdr_stream *xdr,
2881                                 struct nfs41_reclaim_complete_args *args)
2882 {
2883         struct compound_hdr hdr = {
2884                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2885         };
2886 
2887         encode_compound_hdr(xdr, req, &hdr);
2888         encode_sequence(xdr, &args->seq_args, &hdr);
2889         encode_reclaim_complete(xdr, args, &hdr);
2890         encode_nops(&hdr);
2891 }
2892 
2893 /*
2894  * Encode GETDEVICELIST request
2895  */
2896 static void nfs4_xdr_enc_getdevicelist(struct rpc_rqst *req,
2897                                        struct xdr_stream *xdr,
2898                                        struct nfs4_getdevicelist_args *args)
2899 {
2900         struct compound_hdr hdr = {
2901                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2902         };
2903 
2904         encode_compound_hdr(xdr, req, &hdr);
2905         encode_sequence(xdr, &args->seq_args, &hdr);
2906         encode_putfh(xdr, args->fh, &hdr);
2907         encode_getdevicelist(xdr, args, &hdr);
2908         encode_nops(&hdr);
2909 }
2910 
2911 /*
2912  * Encode GETDEVICEINFO request
2913  */
2914 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
2915                                        struct xdr_stream *xdr,
2916                                        struct nfs4_getdeviceinfo_args *args)
2917 {
2918         struct compound_hdr hdr = {
2919                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2920         };
2921 
2922         encode_compound_hdr(xdr, req, &hdr);
2923         encode_sequence(xdr, &args->seq_args, &hdr);
2924         encode_getdeviceinfo(xdr, args, &hdr);
2925 
2926         /* set up reply kvec. Subtract notification bitmap max size (2)
2927          * so that notification bitmap is put in xdr_buf tail */
2928         xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
2929                          args->pdev->pages, args->pdev->pgbase,
2930                          args->pdev->pglen);
2931 
2932         encode_nops(&hdr);
2933 }
2934 
2935 /*
2936  *  Encode LAYOUTGET request
2937  */
2938 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
2939                                    struct xdr_stream *xdr,
2940                                    struct nfs4_layoutget_args *args)
2941 {
2942         struct compound_hdr hdr = {
2943                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2944         };
2945 
2946         encode_compound_hdr(xdr, req, &hdr);
2947         encode_sequence(xdr, &args->seq_args, &hdr);
2948         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2949         encode_layoutget(xdr, args, &hdr);
2950 
2951         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2952             args->layout.pages, 0, args->layout.pglen);
2953 
2954         encode_nops(&hdr);
2955 }
2956 
2957 /*
2958  *  Encode LAYOUTCOMMIT request
2959  */
2960 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
2961                                       struct xdr_stream *xdr,
2962                                       struct nfs4_layoutcommit_args *args)
2963 {
2964         struct nfs4_layoutcommit_data *data =
2965                 container_of(args, struct nfs4_layoutcommit_data, args);
2966         struct compound_hdr hdr = {
2967                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2968         };
2969 
2970         encode_compound_hdr(xdr, req, &hdr);
2971         encode_sequence(xdr, &args->seq_args, &hdr);
2972         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2973         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
2974         encode_getfattr(xdr, args->bitmask, &hdr);
2975         encode_nops(&hdr);
2976 }
2977 
2978 /*
2979  * Encode LAYOUTRETURN request
2980  */
2981 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
2982                                       struct xdr_stream *xdr,
2983                                       struct nfs4_layoutreturn_args *args)
2984 {
2985         struct compound_hdr hdr = {
2986                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2987         };
2988 
2989         encode_compound_hdr(xdr, req, &hdr);
2990         encode_sequence(xdr, &args->seq_args, &hdr);
2991         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2992         encode_layoutreturn(xdr, args, &hdr);
2993         encode_nops(&hdr);
2994 }
2995 
2996 /*
2997  * Encode SECINFO_NO_NAME request
2998  */
2999 static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3000                                         struct xdr_stream *xdr,
3001                                         struct nfs41_secinfo_no_name_args *args)
3002 {
3003         struct compound_hdr hdr = {
3004                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3005         };
3006 
3007         encode_compound_hdr(xdr, req, &hdr);
3008         encode_sequence(xdr, &args->seq_args, &hdr);
3009         encode_putrootfh(xdr, &hdr);
3010         encode_secinfo_no_name(xdr, args, &hdr);
3011         encode_nops(&hdr);
3012         return 0;
3013 }
3014 
3015 /*
3016  *  Encode TEST_STATEID request
3017  */
3018 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3019                                       struct xdr_stream *xdr,
3020                                       struct nfs41_test_stateid_args *args)
3021 {
3022         struct compound_hdr hdr = {
3023                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3024         };
3025 
3026         encode_compound_hdr(xdr, req, &hdr);
3027         encode_sequence(xdr, &args->seq_args, &hdr);
3028         encode_test_stateid(xdr, args, &hdr);
3029         encode_nops(&hdr);
3030 }
3031 
3032 /*
3033  *  Encode FREE_STATEID request
3034  */
3035 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3036                                      struct xdr_stream *xdr,
3037                                      struct nfs41_free_stateid_args *args)
3038 {
3039         struct compound_hdr hdr = {
3040                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3041         };
3042 
3043         encode_compound_hdr(xdr, req, &hdr);
3044         encode_sequence(xdr, &args->seq_args, &hdr);
3045         encode_free_stateid(xdr, args, &hdr);
3046         encode_nops(&hdr);
3047 }
3048 #endif /* CONFIG_NFS_V4_1 */
3049 
3050 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
3051 {
3052         dprintk("nfs: %s: prematurely hit end of receive buffer. "
3053                 "Remaining buffer length is %tu words.\n",
3054                 func, xdr->end - xdr->p);
3055 }
3056 
3057 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3058 {
3059         __be32 *p;
3060 
3061         p = xdr_inline_decode(xdr, 4);
3062         if (unlikely(!p))
3063                 goto out_overflow;
3064         *len = be32_to_cpup(p);
3065         p = xdr_inline_decode(xdr, *len);
3066         if (unlikely(!p))
3067                 goto out_overflow;
3068         *string = (char *)p;
3069         return 0;
3070 out_overflow:
3071         print_overflow_msg(__func__, xdr);
3072         return -EIO;
3073 }
3074 
3075 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3076 {
3077         __be32 *p;
3078 
3079         p = xdr_inline_decode(xdr, 8);
3080         if (unlikely(!p))
3081                 goto out_overflow;
3082         hdr->status = be32_to_cpup(p++);
3083         hdr->taglen = be32_to_cpup(p);
3084 
3085         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3086         if (unlikely(!p))
3087                 goto out_overflow;
3088         hdr->tag = (char *)p;
3089         p += XDR_QUADLEN(hdr->taglen);
3090         hdr->nops = be32_to_cpup(p);
3091         if (unlikely(hdr->nops < 1))
3092                 return nfs4_stat_to_errno(hdr->status);
3093         return 0;
3094 out_overflow:
3095         print_overflow_msg(__func__, xdr);
3096         return -EIO;
3097 }
3098 
3099 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3100                 int *nfs_retval)
3101 {
3102         __be32 *p;
3103         uint32_t opnum;
3104         int32_t nfserr;
3105 
3106         p = xdr_inline_decode(xdr, 8);
3107         if (unlikely(!p))
3108                 goto out_overflow;
3109         opnum = be32_to_cpup(p++);
3110         if (unlikely(opnum != expected))
3111                 goto out_bad_operation;
3112         nfserr = be32_to_cpup(p);
3113         if (nfserr == NFS_OK)
3114                 *nfs_retval = 0;
3115         else
3116                 *nfs_retval = nfs4_stat_to_errno(nfserr);
3117         return true;
3118 out_bad_operation:
3119         dprintk("nfs: Server returned operation"
3120                 " %d but we issued a request for %d\n",
3121                         opnum, expected);
3122         *nfs_retval = -EREMOTEIO;
3123         return false;
3124 out_overflow:
3125         print_overflow_msg(__func__, xdr);
3126         *nfs_retval = -EIO;
3127         return false;
3128 }
3129 
3130 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3131 {
3132         int retval;
3133 
3134         __decode_op_hdr(xdr, expected, &retval);
3135         return retval;
3136 }
3137 
3138 /* Dummy routine */
3139 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
3140 {
3141         __be32 *p;
3142         unsigned int strlen;
3143         char *str;
3144 
3145         p = xdr_inline_decode(xdr, 12);
3146         if (likely(p))
3147                 return decode_opaque_inline(xdr, &strlen, &str);
3148         print_overflow_msg(__func__, xdr);
3149         return -EIO;
3150 }
3151 
3152 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3153 {
3154         uint32_t bmlen;
3155         __be32 *p;
3156 
3157         p = xdr_inline_decode(xdr, 4);
3158         if (unlikely(!p))
3159                 goto out_overflow;
3160         bmlen = be32_to_cpup(p);
3161 
3162         bitmap[0] = bitmap[1] = bitmap[2] = 0;
3163         p = xdr_inline_decode(xdr, (bmlen << 2));
3164         if (unlikely(!p))
3165                 goto out_overflow;
3166         if (bmlen > 0) {
3167                 bitmap[0] = be32_to_cpup(p++);
3168                 if (bmlen > 1) {
3169                         bitmap[1] = be32_to_cpup(p++);
3170                         if (bmlen > 2)
3171                                 bitmap[2] = be32_to_cpup(p);
3172                 }
3173         }
3174         return 0;
3175 out_overflow:
3176         print_overflow_msg(__func__, xdr);
3177         return -EIO;
3178 }
3179 
3180 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3181 {
3182         __be32 *p;
3183 
3184         p = xdr_inline_decode(xdr, 4);
3185         if (unlikely(!p))
3186                 goto out_overflow;
3187         *attrlen = be32_to_cpup(p);
3188         *savep = xdr_stream_pos(xdr);
3189         return 0;
3190 out_overflow:
3191         print_overflow_msg(__func__, xdr);
3192         return -EIO;
3193 }
3194 
3195 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3196 {
3197         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3198                 int ret;
3199                 ret = decode_attr_bitmap(xdr, bitmask);
3200                 if (unlikely(ret < 0))
3201                         return ret;
3202                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3203         } else
3204                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3205         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3206                 bitmask[0], bitmask[1], bitmask[2]);
3207         return 0;
3208 }
3209 
3210 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3211 {
3212         __be32 *p;
3213         int ret = 0;
3214 
3215         *type = 0;
3216         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3217                 return -EIO;
3218         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3219                 p = xdr_inline_decode(xdr, 4);
3220                 if (unlikely(!p))
3221                         goto out_overflow;
3222                 *type = be32_to_cpup(p);
3223                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3224                         dprintk("%s: bad type %d\n", __func__, *type);
3225                         return -EIO;
3226                 }
3227                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3228                 ret = NFS_ATTR_FATTR_TYPE;
3229         }
3230         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3231         return ret;
3232 out_overflow:
3233         print_overflow_msg(__func__, xdr);
3234         return -EIO;
3235 }
3236 
3237 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3238                                       uint32_t *bitmap, uint32_t *type)
3239 {
3240         __be32 *p;
3241 
3242         *type = 0;
3243         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3244                 return -EIO;
3245         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3246                 p = xdr_inline_decode(xdr, 4);
3247                 if (unlikely(!p))
3248                         goto out_overflow;
3249                 *type = be32_to_cpup(p);
3250                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3251         }
3252         dprintk("%s: expire type=0x%x\n", __func__, *type);
3253         return 0;
3254 out_overflow:
3255         print_overflow_msg(__func__, xdr);
3256         return -EIO;
3257 }
3258 
3259 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3260 {
3261         __be32 *p;
3262         int ret = 0;
3263 
3264         *change = 0;
3265         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3266                 return -EIO;
3267         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3268                 p = xdr_inline_decode(xdr, 8);
3269                 if (unlikely(!p))
3270                         goto out_overflow;
3271                 xdr_decode_hyper(p, change);
3272                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3273                 ret = NFS_ATTR_FATTR_CHANGE;
3274         }
3275         dprintk("%s: change attribute=%Lu\n", __func__,
3276                         (unsigned long long)*change);
3277         return ret;
3278 out_overflow:
3279         print_overflow_msg(__func__, xdr);
3280         return -EIO;
3281 }
3282 
3283 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3284 {
3285         __be32 *p;
3286         int ret = 0;
3287 
3288         *size = 0;
3289         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3290                 return -EIO;
3291         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3292                 p = xdr_inline_decode(xdr, 8);
3293                 if (unlikely(!p))
3294                         goto out_overflow;
3295                 xdr_decode_hyper(p, size);
3296                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3297                 ret = NFS_ATTR_FATTR_SIZE;
3298         }
3299         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3300         return ret;
3301 out_overflow:
3302         print_overflow_msg(__func__, xdr);
3303         return -EIO;
3304 }
3305 
3306 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3307 {
3308         __be32 *p;
3309 
3310         *res = 0;
3311         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3312                 return -EIO;
3313         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3314                 p = xdr_inline_decode(xdr, 4);
3315                 if (unlikely(!p))
3316                         goto out_overflow;
3317                 *res = be32_to_cpup(p);
3318                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3319         }
3320         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3321         return 0;
3322 out_overflow:
3323         print_overflow_msg(__func__, xdr);
3324         return -EIO;
3325 }
3326 
3327 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3328 {
3329         __be32 *p;
3330 
3331         *res = 0;
3332         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3333                 return -EIO;
3334         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3335                 p = xdr_inline_decode(xdr, 4);
3336                 if (unlikely(!p))
3337                         goto out_overflow;
3338                 *res = be32_to_cpup(p);
3339                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3340         }
3341         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3342         return 0;
3343 out_overflow:
3344         print_overflow_msg(__func__, xdr);
3345         return -EIO;
3346 }
3347 
3348 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3349 {
3350         __be32 *p;
3351         int ret = 0;
3352 
3353         fsid->major = 0;
3354         fsid->minor = 0;
3355         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3356                 return -EIO;
3357         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3358                 p = xdr_inline_decode(xdr, 16);
3359                 if (unlikely(!p))
3360                         goto out_overflow;
3361                 p = xdr_decode_hyper(p, &fsid->major);
3362                 xdr_decode_hyper(p, &fsid->minor);
3363                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3364                 ret = NFS_ATTR_FATTR_FSID;
3365         }
3366         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3367                         (unsigned long long)fsid->major,
3368                         (unsigned long long)fsid->minor);
3369         return ret;
3370 out_overflow:
3371         print_overflow_msg(__func__, xdr);
3372         return -EIO;
3373 }
3374 
3375 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3376 {
3377         __be32 *p;
3378 
3379         *res = 60;
3380         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3381                 return -EIO;
3382         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3383                 p = xdr_inline_decode(xdr, 4);
3384                 if (unlikely(!p))
3385                         goto out_overflow;
3386                 *res = be32_to_cpup(p);
3387                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3388         }
3389         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3390         return 0;
3391 out_overflow:
3392         print_overflow_msg(__func__, xdr);
3393         return -EIO;
3394 }
3395 
3396 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3397 {
3398         __be32 *p;
3399 
3400         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3401                 return -EIO;
3402         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3403                 p = xdr_inline_decode(xdr, 4);
3404                 if (unlikely(!p))
3405                         goto out_overflow;
3406                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3407                 *res = -be32_to_cpup(p);
3408         }
3409         return 0;
3410 out_overflow:
3411         print_overflow_msg(__func__, xdr);
3412         return -EIO;
3413 }
3414 
3415 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3416 {
3417         __be32 *p;
3418         int len;
3419 
3420         if (fh != NULL)
3421                 memset(fh, 0, sizeof(*fh));
3422 
3423         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3424                 return -EIO;
3425         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3426                 p = xdr_inline_decode(xdr, 4);
3427                 if (unlikely(!p))
3428                         goto out_overflow;
3429                 len = be32_to_cpup(p);
3430                 if (len > NFS4_FHSIZE)
3431                         return -EIO;
3432                 p = xdr_inline_decode(xdr, len);
3433                 if (unlikely(!p))
3434                         goto out_overflow;
3435                 if (fh != NULL) {
3436                         memcpy(fh->data, p, len);
3437                         fh->size = len;
3438                 }
3439                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3440         }
3441         return 0;
3442 out_overflow:
3443         print_overflow_msg(__func__, xdr);
3444         return -EIO;
3445 }
3446 
3447 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3448 {
3449         __be32 *p;
3450 
3451         *res = 0;
3452         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3453                 return -EIO;
3454         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3455                 p = xdr_inline_decode(xdr, 4);
3456                 if (unlikely(!p))
3457                         goto out_overflow;
3458                 *res = be32_to_cpup(p);
3459                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3460         }
3461         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3462         return 0;
3463 out_overflow:
3464         print_overflow_msg(__func__, xdr);
3465         return -EIO;
3466 }
3467 
3468 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3469 {
3470         __be32 *p;
3471         int ret = 0;
3472 
3473         *fileid = 0;
3474         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3475                 return -EIO;
3476         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3477                 p = xdr_inline_decode(xdr, 8);
3478                 if (unlikely(!p))
3479                         goto out_overflow;
3480                 xdr_decode_hyper(p, fileid);
3481                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3482                 ret = NFS_ATTR_FATTR_FILEID;
3483         }
3484         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3485         return ret;
3486 out_overflow:
3487         print_overflow_msg(__func__, xdr);
3488         return -EIO;
3489 }
3490 
3491 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3492 {
3493         __be32 *p;
3494         int ret = 0;
3495 
3496         *fileid = 0;
3497         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3498                 return -EIO;
3499         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3500                 p = xdr_inline_decode(xdr, 8);
3501                 if (unlikely(!p))
3502                         goto out_overflow;
3503                 xdr_decode_hyper(p, fileid);
3504                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3505                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3506         }
3507         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3508         return ret;
3509 out_overflow:
3510         print_overflow_msg(__func__, xdr);
3511         return -EIO;
3512 }
3513 
3514 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3515 {
3516         __be32 *p;
3517         int status = 0;
3518 
3519         *res = 0;
3520         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3521                 return -EIO;
3522         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3523                 p = xdr_inline_decode(xdr, 8);
3524                 if (unlikely(!p))
3525                         goto out_overflow;
3526                 xdr_decode_hyper(p, res);
3527                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3528         }
3529         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3530         return status;
3531 out_overflow:
3532         print_overflow_msg(__func__, xdr);
3533         return -EIO;
3534 }
3535 
3536 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3537 {
3538         __be32 *p;
3539         int status = 0;
3540 
3541         *res = 0;
3542         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3543                 return -EIO;
3544         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3545                 p = xdr_inline_decode(xdr, 8);
3546                 if (unlikely(!p))
3547                         goto out_overflow;
3548                 xdr_decode_hyper(p, res);
3549                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3550         }
3551         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3552         return status;
3553 out_overflow:
3554         print_overflow_msg(__func__, xdr);
3555         return -EIO;
3556 }
3557 
3558 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3559 {
3560         __be32 *p;
3561         int status = 0;
3562 
3563         *res = 0;
3564         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3565                 return -EIO;
3566         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3567                 p = xdr_inline_decode(xdr, 8);
3568                 if (unlikely(!p))
3569                         goto out_overflow;
3570                 xdr_decode_hyper(p, res);
3571                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3572         }
3573         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3574         return status;
3575 out_overflow:
3576         print_overflow_msg(__func__, xdr);
3577         return -EIO;
3578 }
3579 
3580 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3581 {
3582         u32 n;
3583         __be32 *p;
3584         int status = 0;
3585 
3586         p = xdr_inline_decode(xdr, 4);
3587         if (unlikely(!p))
3588                 goto out_overflow;
3589         n = be32_to_cpup(p);
3590         if (n == 0)
3591                 goto root_path;
3592         dprintk("pathname4: ");
3593         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3594                 dprintk("cannot parse %d components in path\n", n);
3595                 goto out_eio;
3596         }
3597         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3598                 struct nfs4_string *component = &path->components[path->ncomponents];
3599                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3600                 if (unlikely(status != 0))
3601                         goto out_eio;
3602                 ifdebug (XDR)
3603                         pr_cont("%s%.*s ",
3604                                 (path->ncomponents != n ? "/ " : ""),
3605                                 component->len, component->data);
3606         }
3607 out:
3608         return status;
3609 root_path:
3610 /* a root pathname is sent as a zero component4 */
3611         path->ncomponents = 1;
3612         path->components[0].len=0;
3613         path->components[0].data=NULL;
3614         dprintk("pathname4: /\n");
3615         goto out;
3616 out_eio:
3617         dprintk(" status %d", status);
3618         status = -EIO;
3619         goto out;
3620 out_overflow:
3621         print_overflow_msg(__func__, xdr);
3622         return -EIO;
3623 }
3624 
3625 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3626 {
3627         int n;
3628         __be32 *p;
3629         int status = -EIO;
3630 
3631         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3632                 goto out;
3633         status = 0;
3634         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3635                 goto out;
3636         status = -EIO;
3637         /* Ignore borken servers that return unrequested attrs */
3638         if (unlikely(res == NULL))
3639                 goto out;
3640         dprintk("%s: fsroot:\n", __func__);
3641         status = decode_pathname(xdr, &res->fs_path);
3642         if (unlikely(status != 0))
3643                 goto out;
3644         p = xdr_inline_decode(xdr, 4);
3645         if (unlikely(!p))
3646                 goto out_overflow;
3647         n = be32_to_cpup(p);
3648         if (n <= 0)
3649                 goto out_eio;
3650         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3651                 u32 m;
3652                 struct nfs4_fs_location *loc;
3653 
3654                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3655                         break;
3656                 loc = &res->locations[res->nlocations];
3657                 p = xdr_inline_decode(xdr, 4);
3658                 if (unlikely(!p))
3659                         goto out_overflow;
3660                 m = be32_to_cpup(p);
3661 
3662                 dprintk("%s: servers:\n", __func__);
3663                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3664                         struct nfs4_string *server;
3665 
3666                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3667                                 unsigned int i;
3668                                 dprintk("%s: using first %u of %u servers "
3669                                         "returned for location %u\n",
3670                                                 __func__,
3671                                                 NFS4_FS_LOCATION_MAXSERVERS,
3672                                                 m, res->nlocations);
3673                                 for (i = loc->nservers; i < m; i++) {
3674                                         unsigned int len;
3675                                         char *data;
3676                                         status = decode_opaque_inline(xdr, &len, &data);
3677                                         if (unlikely(status != 0))
3678                                                 goto out_eio;
3679                                 }
3680                                 break;
3681                         }
3682                         server = &loc->servers[loc->nservers];
3683                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3684                         if (unlikely(status != 0))
3685                                 goto out_eio;
3686                         dprintk("%s ", server->data);
3687                 }
3688                 status = decode_pathname(xdr, &loc->rootpath);
3689                 if (unlikely(status != 0))
3690                         goto out_eio;
3691         }
3692         if (res->nlocations != 0)
3693                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3694 out:
3695         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3696         return status;
3697 out_overflow:
3698         print_overflow_msg(__func__, xdr);
3699 out_eio:
3700         status = -EIO;
3701         goto out;
3702 }
3703 
3704 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3705 {
3706         __be32 *p;
3707         int status = 0;
3708 
3709         *res = 0;
3710         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3711                 return -EIO;
3712         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3713                 p = xdr_inline_decode(xdr, 8);
3714                 if (unlikely(!p))
3715                         goto out_overflow;
3716                 xdr_decode_hyper(p, res);
3717                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3718         }
3719         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3720         return status;
3721 out_overflow:
3722         print_overflow_msg(__func__, xdr);
3723         return -EIO;
3724 }
3725 
3726 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3727 {
3728         __be32 *p;
3729         int status = 0;
3730 
3731         *maxlink = 1;
3732         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3733                 return -EIO;
3734         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3735                 p = xdr_inline_decode(xdr, 4);
3736                 if (unlikely(!p))
3737                         goto out_overflow;
3738                 *maxlink = be32_to_cpup(p);
3739                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3740         }
3741         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3742         return status;
3743 out_overflow:
3744         print_overflow_msg(__func__, xdr);
3745         return -EIO;
3746 }
3747 
3748 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3749 {
3750         __be32 *p;
3751         int status = 0;
3752 
3753         *maxname = 1024;
3754         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3755                 return -EIO;
3756         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3757                 p = xdr_inline_decode(xdr, 4);
3758                 if (unlikely(!p))
3759                         goto out_overflow;
3760                 *maxname = be32_to_cpup(p);
3761                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3762         }
3763         dprintk("%s: maxname=%u\n", __func__, *maxname);
3764         return status;
3765 out_overflow:
3766         print_overflow_msg(__func__, xdr);
3767         return -EIO;
3768 }
3769 
3770 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3771 {
3772         __be32 *p;
3773         int status = 0;
3774 
3775         *res = 1024;
3776         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3777                 return -EIO;
3778         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3779                 uint64_t maxread;
3780                 p = xdr_inline_decode(xdr, 8);
3781                 if (unlikely(!p))
3782                         goto out_overflow;
3783                 xdr_decode_hyper(p, &maxread);
3784                 if (maxread > 0x7FFFFFFF)
3785                         maxread = 0x7FFFFFFF;
3786                 *res = (uint32_t)maxread;
3787                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3788         }
3789         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3790         return status;
3791 out_overflow:
3792         print_overflow_msg(__func__, xdr);
3793         return -EIO;
3794 }
3795 
3796 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3797 {
3798         __be32 *p;
3799         int status = 0;
3800 
3801         *res = 1024;
3802         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3803                 return -EIO;
3804         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3805                 uint64_t maxwrite;
3806                 p = xdr_inline_decode(xdr, 8);
3807                 if (unlikely(!p))
3808                         goto out_overflow;
3809                 xdr_decode_hyper(p, &maxwrite);
3810                 if (maxwrite > 0x7FFFFFFF)
3811                         maxwrite = 0x7FFFFFFF;
3812                 *res = (uint32_t)maxwrite;
3813                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3814         }
3815         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3816         return status;
3817 out_overflow:
3818         print_overflow_msg(__func__, xdr);
3819         return -EIO;
3820 }
3821 
3822 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3823 {
3824         uint32_t tmp;
3825         __be32 *p;
3826         int ret = 0;
3827 
3828         *mode = 0;
3829         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3830                 return -EIO;
3831         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3832                 p = xdr_inline_decode(xdr, 4);
3833                 if (unlikely(!p))
3834                         goto out_overflow;
3835                 tmp = be32_to_cpup(p);
3836                 *mode = tmp & ~S_IFMT;
3837                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3838                 ret = NFS_ATTR_FATTR_MODE;
3839         }
3840         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3841         return ret;
3842 out_overflow:
3843         print_overflow_msg(__func__, xdr);
3844         return -EIO;
3845 }
3846 
3847 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3848 {
3849         __be32 *p;
3850         int ret = 0;
3851 
3852         *nlink = 1;
3853         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3854                 return -EIO;
3855         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3856                 p = xdr_inline_decode(xdr, 4);
3857                 if (unlikely(!p))
3858                         goto out_overflow;
3859                 *nlink = be32_to_cpup(p);
3860                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3861                 ret = NFS_ATTR_FATTR_NLINK;
3862         }
3863         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3864         return ret;
3865 out_overflow:
3866         print_overflow_msg(__func__, xdr);
3867         return -EIO;
3868 }
3869 
3870 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3871                 const struct nfs_server *server, kuid_t *uid,
3872                 struct nfs4_string *owner_name)
3873 {
3874         uint32_t len;
3875         __be32 *p;
3876         int ret = 0;
3877 
3878         *uid = make_kuid(&init_user_ns, -2);
3879         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3880                 return -EIO;
3881         if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3882                 p = xdr_inline_decode(xdr, 4);
3883                 if (unlikely(!p))
3884                         goto out_overflow;
3885                 len = be32_to_cpup(p);
3886                 p = xdr_inline_decode(xdr, len);
3887                 if (unlikely(!p))
3888                         goto out_overflow;
3889                 if (owner_name != NULL) {
3890                         owner_name->data = kmemdup(p, len, GFP_NOWAIT);
3891                         if (owner_name->data != NULL) {
3892                                 owner_name->len = len;
3893                                 ret = NFS_ATTR_FATTR_OWNER_NAME;
3894                         }
3895                 } else if (len < XDR_MAX_NETOBJ) {
3896                         if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
3897                                 ret = NFS_ATTR_FATTR_OWNER;
3898                         else
3899                                 dprintk("%s: nfs_map_name_to_uid failed!\n",
3900                                                 __func__);
3901                 } else
3902                         dprintk("%s: name too long (%u)!\n",
3903                                         __func__, len);
3904                 bitmap[1] &= ~FATTR4_WORD1_OWNER;
3905         }
3906         dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3907         return ret;
3908 out_overflow:
3909         print_overflow_msg(__func__, xdr);
3910         return -EIO;
3911 }
3912 
3913 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3914                 const struct nfs_server *server, kgid_t *gid,
3915                 struct nfs4_string *group_name)
3916 {
3917         uint32_t len;
3918         __be32 *p;
3919         int ret = 0;
3920 
3921         *gid = make_kgid(&init_user_ns, -2);
3922         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3923                 return -EIO;
3924         if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3925                 p = xdr_inline_decode(xdr, 4);
3926                 if (unlikely(!p))
3927                         goto out_overflow;
3928                 len = be32_to_cpup(p);
3929                 p = xdr_inline_decode(xdr, len);
3930                 if (unlikely(!p))
3931                         goto out_overflow;
3932                 if (group_name != NULL) {
3933                         group_name->data = kmemdup(p, len, GFP_NOWAIT);
3934                         if (group_name->data != NULL) {
3935                                 group_name->len = len;
3936                                 ret = NFS_ATTR_FATTR_GROUP_NAME;
3937                         }
3938                 } else if (len < XDR_MAX_NETOBJ) {
3939                         if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
3940                                 ret = NFS_ATTR_FATTR_GROUP;
3941                         else
3942                                 dprintk("%s: nfs_map_group_to_gid failed!\n",
3943                                                 __func__);
3944                 } else
3945                         dprintk("%s: name too long (%u)!\n",
3946                                         __func__, len);
3947                 bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3948         }
3949         dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3950         return ret;
3951 out_overflow:
3952         print_overflow_msg(__func__, xdr);
3953         return -EIO;
3954 }
3955 
3956 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3957 {
3958         uint32_t major = 0, minor = 0;
3959         __be32 *p;
3960         int ret = 0;
3961 
3962         *rdev = MKDEV(0,0);
3963         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3964                 return -EIO;
3965         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3966                 dev_t tmp;
3967 
3968                 p = xdr_inline_decode(xdr, 8);
3969                 if (unlikely(!p))
3970                         goto out_overflow;
3971                 major = be32_to_cpup(p++);
3972                 minor = be32_to_cpup(p);
3973                 tmp = MKDEV(major, minor);
3974                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3975                         *rdev = tmp;
3976                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3977                 ret = NFS_ATTR_FATTR_RDEV;
3978         }
3979         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3980         return ret;
3981 out_overflow:
3982         print_overflow_msg(__func__, xdr);
3983         return -EIO;
3984 }
3985 
3986 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3987 {
3988         __be32 *p;
3989         int status = 0;
3990 
3991         *res = 0;
3992         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3993                 return -EIO;
3994         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3995                 p = xdr_inline_decode(xdr, 8);
3996                 if (unlikely(!p))
3997                         goto out_overflow;
3998                 xdr_decode_hyper(p, res);
3999                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
4000         }
4001         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
4002         return status;
4003 out_overflow:
4004         print_overflow_msg(__func__, xdr);
4005         return -EIO;
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                         goto out_overflow;
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 out_overflow:
4026         print_overflow_msg(__func__, xdr);
4027         return -EIO;
4028 }
4029 
4030 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4031 {
4032         __be32 *p;
4033         int status = 0;
4034 
4035         *res = 0;
4036         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4037                 return -EIO;
4038         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4039                 p = xdr_inline_decode(xdr, 8);
4040                 if (unlikely(!p))
4041                         goto out_overflow;
4042                 xdr_decode_hyper(p, res);
4043                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4044         }
4045         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4046         return status;
4047 out_overflow:
4048         print_overflow_msg(__func__, xdr);
4049         return -EIO;
4050 }
4051 
4052 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4053 {
4054         __be32 *p;
4055         int ret = 0;
4056 
4057         *used = 0;
4058         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4059                 return -EIO;
4060         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4061                 p = xdr_inline_decode(xdr, 8);
4062                 if (unlikely(!p))
4063                         goto out_overflow;
4064                 xdr_decode_hyper(p, used);
4065                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4066                 ret = NFS_ATTR_FATTR_SPACE_USED;
4067         }
4068         dprintk("%s: space used=%Lu\n", __func__,
4069                         (unsigned long long)*used);
4070         return ret;
4071 out_overflow:
4072         print_overflow_msg(__func__, xdr);
4073         return -EIO;
4074 }
4075 
4076 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4077 {
4078         __be32 *p;
4079         uint64_t sec;
4080         uint32_t nsec;
4081 
4082         p = xdr_inline_decode(xdr, 12);
4083         if (unlikely(!p))
4084                 goto out_overflow;
4085         p = xdr_decode_hyper(p, &sec);
4086         nsec = be32_to_cpup(p);
4087         time->tv_sec = (time_t)sec;
4088         time->tv_nsec = (long)nsec;
4089         return 0;
4090 out_overflow:
4091         print_overflow_msg(__func__, xdr);
4092         return -EIO;
4093 }
4094 
4095 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4096 {
4097         int status = 0;
4098 
4099         time->tv_sec = 0;
4100         time->tv_nsec = 0;
4101         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4102                 return -EIO;
4103         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4104                 status = decode_attr_time(xdr, time);
4105                 if (status == 0)
4106                         status = NFS_ATTR_FATTR_ATIME;
4107                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4108         }
4109         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4110         return status;
4111 }
4112 
4113 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4114 {
4115         int status = 0;
4116 
4117         time->tv_sec = 0;
4118         time->tv_nsec = 0;
4119         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4120                 return -EIO;
4121         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4122                 status = decode_attr_time(xdr, time);
4123                 if (status == 0)
4124                         status = NFS_ATTR_FATTR_CTIME;
4125                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4126         }
4127         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4128         return status;
4129 }
4130 
4131 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4132                                   struct timespec *time)
4133 {
4134         int status = 0;
4135 
4136         time->tv_sec = 0;
4137         time->tv_nsec = 0;
4138         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4139                 return -EIO;
4140         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4141                 status = decode_attr_time(xdr, time);
4142                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4143         }
4144         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4145                 (long)time->tv_nsec);
4146         return status;
4147 }
4148 
4149 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4150                                         struct nfs4_label *label)
4151 {
4152         uint32_t pi = 0;
4153         uint32_t lfs = 0;
4154         __u32 len;
4155         __be32 *p;
4156         int status = 0;
4157 
4158         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4159                 return -EIO;
4160         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4161                 p = xdr_inline_decode(xdr, 4);
4162                 if (unlikely(!p))
4163                         goto out_overflow;
4164                 lfs = be32_to_cpup(p++);
4165                 p = xdr_inline_decode(xdr, 4);
4166                 if (unlikely(!p))
4167                         goto out_overflow;
4168                 pi = be32_to_cpup(p++);
4169                 p = xdr_inline_decode(xdr, 4);
4170                 if (unlikely(!p))
4171                         goto out_overflow;
4172                 len = be32_to_cpup(p++);
4173                 p = xdr_inline_decode(xdr, len);
4174                 if (unlikely(!p))
4175                         goto out_overflow;
4176                 if (len < NFS4_MAXLABELLEN) {
4177                         if (label) {
4178                                 memcpy(label->label, p, len);
4179                                 label->len = len;
4180                                 label->pi = pi;
4181                                 label->lfs = lfs;
4182                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4183                         }
4184                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4185                 } else
4186                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4187                                         __func__, len);
4188         }
4189         if (label && label->label)
4190                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4191                         (char *)label->label, label->len, label->pi, label->lfs);
4192         return status;
4193 
4194 out_overflow:
4195         print_overflow_msg(__func__, xdr);
4196         return -EIO;
4197 }
4198 
4199 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4200 {
4201         int status = 0;
4202 
4203         time->tv_sec = 0;
4204         time->tv_nsec = 0;
4205         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4206                 return -EIO;
4207         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4208                 status = decode_attr_time(xdr, time);
4209                 if (status == 0)
4210                         status = NFS_ATTR_FATTR_MTIME;
4211                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4212         }
4213         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4214         return status;
4215 }
4216 
4217 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4218 {
4219         unsigned int attrwords = XDR_QUADLEN(attrlen);
4220         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4221 
4222         if (unlikely(attrwords != nwords)) {
4223                 dprintk("%s: server returned incorrect attribute length: "
4224                         "%u %c %u\n",
4225                                 __func__,
4226                                 attrwords << 2,
4227                                 (attrwords < nwords) ? '<' : '>',
4228                                 nwords << 2);
4229                 return -EIO;
4230         }
4231         return 0;
4232 }
4233 
4234 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4235 {
4236         __be32 *p;
4237 
4238         p = xdr_inline_decode(xdr, 20);
4239         if (unlikely(!p))
4240                 goto out_overflow;
4241         cinfo->atomic = be32_to_cpup(p++);
4242         p = xdr_decode_hyper(p, &cinfo->before);
4243         xdr_decode_hyper(p, &cinfo->after);
4244         return 0;
4245 out_overflow:
4246         print_overflow_msg(__func__, xdr);
4247         return -EIO;
4248 }
4249 
4250 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4251 {
4252         __be32 *p;
4253         uint32_t supp, acc;
4254         int status;
4255 
4256         status = decode_op_hdr(xdr, OP_ACCESS);
4257         if (status)
4258                 return status;
4259         p = xdr_inline_decode(xdr, 8);
4260         if (unlikely(!p))
4261                 goto out_overflow;
4262         supp = be32_to_cpup(p++);
4263         acc = be32_to_cpup(p);
4264         *supported = supp;
4265         *access = acc;
4266         return 0;
4267 out_overflow:
4268         print_overflow_msg(__func__, xdr);
4269         return -EIO;
4270 }
4271 
4272 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4273 {
4274         __be32 *p;
4275 
4276         p = xdr_inline_decode(xdr, len);
4277         if (likely(p)) {
4278                 memcpy(buf, p, len);
4279                 return 0;
4280         }
4281         print_overflow_msg(__func__, xdr);
4282         return -EIO;
4283 }
4284 
4285 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4286 {
4287         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4288 }
4289 
4290 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4291 {
4292         int status;
4293 
4294         status = decode_op_hdr(xdr, OP_CLOSE);
4295         if (status != -EIO)
4296                 nfs_increment_open_seqid(status, res->seqid);
4297         if (!status)
4298                 status = decode_stateid(xdr, &res->stateid);
4299         return status;
4300 }
4301 
4302 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4303 {
4304         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4305 }
4306 
4307 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4308 {
4309         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4310 }
4311 
4312 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4313 {
4314         int status;
4315 
4316         status = decode_op_hdr(xdr, OP_COMMIT);
4317         if (!status)
4318                 status = decode_write_verifier(xdr, &res->verf->verifier);
4319         return status;
4320 }
4321 
4322 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4323 {
4324         __be32 *p;
4325         uint32_t bmlen;
4326         int status;
4327 
4328         status = decode_op_hdr(xdr, OP_CREATE);
4329         if (status)
4330                 return status;
4331         if ((status = decode_change_info(xdr, cinfo)))
4332                 return status;
4333         p = xdr_inline_decode(xdr, 4);
4334         if (unlikely(!p))
4335                 goto out_overflow;
4336         bmlen = be32_to_cpup(p);
4337         p = xdr_inline_decode(xdr, bmlen << 2);
4338         if (likely(p))
4339                 return 0;
4340 out_overflow:
4341         print_overflow_msg(__func__, xdr);
4342         return -EIO;
4343 }
4344 
4345 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4346 {
4347         unsigned int savep;
4348         uint32_t attrlen, bitmap[3] = {0};
4349         int status;
4350 
4351         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4352                 goto xdr_error;
4353         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4354                 goto xdr_error;
4355         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4356                 goto xdr_error;
4357         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4358                 goto xdr_error;
4359         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4360                                                  &res->fh_expire_type)) != 0)
4361                 goto xdr_error;
4362         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4363                 goto xdr_error;
4364         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4365                 goto xdr_error;
4366         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4367                 goto xdr_error;
4368         status = verify_attr_len(xdr, savep, attrlen);
4369 xdr_error:
4370         dprintk("%s: xdr returned %d!\n", __func__, -status);
4371         return status;
4372 }
4373 
4374 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4375 {
4376         unsigned int savep;
4377         uint32_t attrlen, bitmap[3] = {0};
4378         int status;
4379 
4380         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4381                 goto xdr_error;
4382         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4383                 goto xdr_error;
4384         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4385                 goto xdr_error;
4386 
4387         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4388                 goto xdr_error;
4389         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4390                 goto xdr_error;
4391         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4392                 goto xdr_error;
4393         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4394                 goto xdr_error;
4395         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4396                 goto xdr_error;
4397         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4398                 goto xdr_error;
4399 
4400         status = verify_attr_len(xdr, savep, attrlen);
4401 xdr_error:
4402         dprintk("%s: xdr returned %d!\n", __func__, -status);
4403         return status;
4404 }
4405 
4406 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4407 {
4408         unsigned int savep;
4409         uint32_t attrlen, bitmap[3] = {0};
4410         int status;
4411 
4412         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4413                 goto xdr_error;
4414         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4415                 goto xdr_error;
4416         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4417                 goto xdr_error;
4418 
4419         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4420                 goto xdr_error;
4421         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4422                 goto xdr_error;
4423 
4424         status = verify_attr_len(xdr, savep, attrlen);
4425 xdr_error:
4426         dprintk("%s: xdr returned %d!\n", __func__, -status);
4427         return status;
4428 }
4429 
4430 static int decode_threshold_hint(struct xdr_stream *xdr,
4431                                   uint32_t *bitmap,
4432                                   uint64_t *res,
4433                                   uint32_t hint_bit)
4434 {
4435         __be32 *p;
4436 
4437         *res = 0;
4438         if (likely(bitmap[0] & hint_bit)) {
4439                 p = xdr_inline_decode(xdr, 8);
4440                 if (unlikely(!p))
4441                         goto out_overflow;
4442                 xdr_decode_hyper(p, res);
4443         }
4444         return 0;
4445 out_overflow:
4446         print_overflow_msg(__func__, xdr);
4447         return -EIO;
4448 }
4449 
4450 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4451                                         struct nfs4_threshold *res)
4452 {
4453         __be32 *p;
4454         unsigned int savep;
4455         uint32_t bitmap[3] = {0,}, attrlen;
4456         int status;
4457 
4458         /* layout type */
4459         p = xdr_inline_decode(xdr, 4);
4460         if (unlikely(!p)) {
4461                 print_overflow_msg(__func__, xdr);
4462                 return -EIO;
4463         }
4464         res->l_type = be32_to_cpup(p);
4465 
4466         /* thi_hintset bitmap */
4467         status = decode_attr_bitmap(xdr, bitmap);
4468         if (status < 0)
4469                 goto xdr_error;
4470 
4471         /* thi_hintlist length */
4472         status = decode_attr_length(xdr, &attrlen, &savep);
4473         if (status < 0)
4474                 goto xdr_error;
4475         /* thi_hintlist */
4476         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4477         if (status < 0)
4478                 goto xdr_error;
4479         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4480         if (status < 0)
4481                 goto xdr_error;
4482         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4483                                        THRESHOLD_RD_IO);
4484         if (status < 0)
4485                 goto xdr_error;
4486         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4487                                        THRESHOLD_WR_IO);
4488         if (status < 0)
4489                 goto xdr_error;
4490 
4491         status = verify_attr_len(xdr, savep, attrlen);
4492         res->bm = bitmap[0];
4493 
4494         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4495                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4496                 res->wr_io_sz);
4497 xdr_error:
4498         dprintk("%s ret=%d!\n", __func__, status);
4499         return status;
4500 }
4501 
4502 /*
4503  * Thresholds on pNFS direct I/O vrs MDS I/O
4504  */
4505 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4506                                     uint32_t *bitmap,
4507                                     struct nfs4_threshold *res)
4508 {
4509         __be32 *p;
4510         int status = 0;
4511         uint32_t num;
4512 
4513         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4514                 return -EIO;
4515         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4516                 /* Did the server return an unrequested attribute? */
4517                 if (unlikely(res == NULL))
4518                         return -EREMOTEIO;
4519                 p = xdr_inline_decode(xdr, 4);
4520                 if (unlikely(!p))
4521                         goto out_overflow;
4522                 num = be32_to_cpup(p);
4523                 if (num == 0)
4524                         return 0;
4525                 if (num > 1)
4526                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4527                                 "drivers per filesystem not supported\n",
4528                                 __func__);
4529 
4530                 status = decode_first_threshold_item4(xdr, res);
4531                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4532         }
4533         return status;
4534 out_overflow:
4535         print_overflow_msg(__func__, xdr);
4536         return -EIO;
4537 }
4538 
4539 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4540                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4541                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4542                 const struct nfs_server *server)
4543 {
4544         int status;
4545         umode_t fmode = 0;
4546         uint32_t type;
4547         int32_t err;
4548 
4549         status = decode_attr_type(xdr, bitmap, &type);
4550         if (status < 0)
4551                 goto xdr_error;
4552         fattr->mode = 0;
4553         if (status != 0) {
4554                 fattr->mode |= nfs_type2fmt[type];
4555                 fattr->valid |= status;
4556         }
4557 
4558         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4559         if (status < 0)
4560                 goto xdr_error;
4561         fattr->valid |= status;
4562 
4563         status = decode_attr_size(xdr, bitmap, &fattr->size);
4564         if (status < 0)
4565                 goto xdr_error;
4566         fattr->valid |= status;
4567 
4568         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4569         if (status < 0)
4570                 goto xdr_error;
4571         fattr->valid |= status;
4572 
4573         err = 0;
4574         status = decode_attr_error(xdr, bitmap, &err);
4575         if (status < 0)
4576                 goto xdr_error;
4577 
4578         status = decode_attr_filehandle(xdr, bitmap, fh);
4579         if (status < 0)
4580                 goto xdr_error;
4581 
4582         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4583         if (status < 0)
4584                 goto xdr_error;
4585         fattr->valid |= status;
4586 
4587         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4588         if (status < 0)
4589                 goto xdr_error;
4590         fattr->valid |= status;
4591 
4592         status = decode_attr_mode(xdr, bitmap, &fmode);
4593         if (status < 0)
4594                 goto xdr_error;
4595         if (status != 0) {
4596                 fattr->mode |= fmode;
4597                 fattr->valid |= status;
4598         }
4599 
4600         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4601         if (status < 0)
4602                 goto xdr_error;
4603         fattr->valid |= status;
4604 
4605         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4606         if (status < 0)
4607                 goto xdr_error;
4608         fattr->valid |= status;
4609 
4610         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4611         if (status < 0)
4612                 goto xdr_error;
4613         fattr->valid |= status;
4614 
4615         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4616         if (status < 0)
4617                 goto xdr_error;
4618         fattr->valid |= status;
4619 
4620         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4621         if (status < 0)
4622                 goto xdr_error;
4623         fattr->valid |= status;
4624 
4625         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4626         if (status < 0)
4627                 goto xdr_error;
4628         fattr->valid |= status;
4629 
4630         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4631         if (status < 0)
4632                 goto xdr_error;
4633         fattr->valid |= status;
4634 
4635         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4636         if (status < 0)
4637                 goto xdr_error;
4638         fattr->valid |= status;
4639 
4640         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4641         if (status < 0)
4642                 goto xdr_error;
4643         fattr->valid |= status;
4644 
4645         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4646         if (status < 0)
4647                 goto xdr_error;
4648 
4649         if (label) {
4650                 status = decode_attr_security_label(xdr, bitmap, label);
4651                 if (status < 0)
4652                         goto xdr_error;
4653                 fattr->valid |= status;
4654         }
4655 
4656 xdr_error:
4657         dprintk("%s: xdr returned %d\n", __func__, -status);
4658         return status;
4659 }
4660 
4661 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4662                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4663                 struct nfs4_label *label, const struct nfs_server *server)
4664 {
4665         unsigned int savep;
4666         uint32_t attrlen,
4667                  bitmap[3] = {0};
4668         int status;
4669 
4670         status = decode_op_hdr(xdr, OP_GETATTR);
4671         if (status < 0)
4672                 goto xdr_error;
4673 
4674         status = decode_attr_bitmap(xdr, bitmap);
4675         if (status < 0)
4676                 goto xdr_error;
4677 
4678         status = decode_attr_length(xdr, &attrlen, &savep);
4679         if (status < 0)
4680                 goto xdr_error;
4681 
4682         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4683                                         label, server);
4684         if (status < 0)
4685                 goto xdr_error;
4686 
4687         status = verify_attr_len(xdr, savep, attrlen);
4688 xdr_error:
4689         dprintk("%s: xdr returned %d\n", __func__, -status);
4690         return status;
4691 }
4692 
4693 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4694                 struct nfs4_label *label, const struct nfs_server *server)
4695 {
4696         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4697 }
4698 
4699 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4700                 const struct nfs_server *server)
4701 {
4702         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4703 }
4704 
4705 /*
4706  * Decode potentially multiple layout types. Currently we only support
4707  * one layout driver per file system.
4708  */
4709 static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
4710                                          uint32_t *layouttype)
4711 {
4712         __be32 *p;
4713         int num;
4714 
4715         p = xdr_inline_decode(xdr, 4);
4716         if (unlikely(!p))
4717                 goto out_overflow;
4718         num = be32_to_cpup(p);
4719 
4720         /* pNFS is not supported by the underlying file system */
4721         if (num == 0) {
4722                 *layouttype = 0;
4723                 return 0;
4724         }
4725         if (num > 1)
4726                 printk(KERN_INFO "NFS: %s: Warning: Multiple pNFS layout "
4727                         "drivers per filesystem not supported\n", __func__);
4728 
4729         /* Decode and set first layout type, move xdr->p past unused types */
4730         p = xdr_inline_decode(xdr, num * 4);
4731         if (unlikely(!p))
4732                 goto out_overflow;
4733         *layouttype = be32_to_cpup(p);
4734         return 0;
4735 out_overflow:
4736         print_overflow_msg(__func__, xdr);
4737         return -EIO;
4738 }
4739 
4740 /*
4741  * The type of file system exported.
4742  * Note we must ensure that layouttype is set in any non-error case.
4743  */
4744 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4745                                 uint32_t *layouttype)
4746 {
4747         int status = 0;
4748 
4749         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4750         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4751                 return -EIO;
4752         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4753                 status = decode_first_pnfs_layout_type(xdr, layouttype);
4754                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4755         } else
4756                 *layouttype = 0;
4757         return status;
4758 }
4759 
4760 /*
4761  * The prefered block size for layout directed io
4762  */
4763 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4764                                       uint32_t *res)
4765 {
4766         __be32 *p;
4767 
4768         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4769         *res = 0;
4770         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4771                 p = xdr_inline_decode(xdr, 4);
4772                 if (unlikely(!p)) {
4773                         print_overflow_msg(__func__, xdr);
4774                         return -EIO;
4775                 }
4776                 *res = be32_to_cpup(p);
4777                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4778         }
4779         return 0;
4780 }
4781 
4782 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4783 {
4784         unsigned int savep;
4785         uint32_t attrlen, bitmap[3];
4786         int status;
4787 
4788         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4789                 goto xdr_error;
4790         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4791                 goto xdr_error;
4792         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4793                 goto xdr_error;
4794 
4795         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4796 
4797         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4798                 goto xdr_error;
4799         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4800                 goto xdr_error;
4801         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4802                 goto xdr_error;
4803         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4804         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4805                 goto xdr_error;
4806         fsinfo->wtpref = fsinfo->wtmax;
4807         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4808         if (status != 0)
4809                 goto xdr_error;
4810         status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4811         if (status != 0)
4812                 goto xdr_error;
4813         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4814         if (status)
4815                 goto xdr_error;
4816 
4817         status = verify_attr_len(xdr, savep, attrlen);
4818 xdr_error:
4819         dprintk("%s: xdr returned %d!\n", __func__, -status);
4820         return status;
4821 }
4822 
4823 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4824 {
4825         __be32 *p;
4826         uint32_t len;
4827         int status;
4828 
4829         /* Zero handle first to allow comparisons */
4830         memset(fh, 0, sizeof(*fh));
4831 
4832         status = decode_op_hdr(xdr, OP_GETFH);
4833         if (status)
4834                 return status;
4835 
4836         p = xdr_inline_decode(xdr, 4);
4837         if (unlikely(!p))
4838                 goto out_overflow;
4839         len = be32_to_cpup(p);
4840         if (len > NFS4_FHSIZE)
4841                 return -EIO;
4842         fh->size = len;
4843         p = xdr_inline_decode(xdr, len);
4844         if (unlikely(!p))
4845                 goto out_overflow;
4846         memcpy(fh->data, p, len);
4847         return 0;
4848 out_overflow:
4849         print_overflow_msg(__func__, xdr);
4850         return -EIO;
4851 }
4852 
4853 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4854 {
4855         int status;
4856 
4857         status = decode_op_hdr(xdr, OP_LINK);
4858         if (status)
4859                 return status;
4860         return decode_change_info(xdr, cinfo);
4861 }
4862 
4863 /*
4864  * We create the owner, so we know a proper owner.id length is 4.
4865  */
4866 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4867 {
4868         uint64_t offset, length, clientid;
4869         __be32 *p;
4870         uint32_t namelen, type;
4871 
4872         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4873         if (unlikely(!p))
4874                 goto out_overflow;
4875         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4876         p = xdr_decode_hyper(p, &length);
4877         type = be32_to_cpup(p++); /* 4 byte read */
4878         if (fl != NULL) { /* manipulate file lock */
4879                 fl->fl_start = (loff_t)offset;
4880                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4881                 if (length == ~(uint64_t)0)
4882                         fl->fl_end = OFFSET_MAX;
4883                 fl->fl_type = F_WRLCK;
4884                 if (type & 1)
4885                         fl->fl_type = F_RDLCK;
4886                 fl->fl_pid = 0;
4887         }
4888         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4889         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4890         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4891         if (likely(p))
4892                 return -NFS4ERR_DENIED;
4893 out_overflow:
4894         print_overflow_msg(__func__, xdr);
4895         return -EIO;
4896 }
4897 
4898 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4899 {
4900         int status;
4901 
4902         status = decode_op_hdr(xdr, OP_LOCK);
4903         if (status == -EIO)
4904                 goto out;
4905         if (status == 0) {
4906                 status = decode_stateid(xdr, &res->stateid);
4907                 if (unlikely(status))
4908                         goto out;
4909         } else if (status == -NFS4ERR_DENIED)
4910                 status = decode_lock_denied(xdr, NULL);
4911         if (res->open_seqid != NULL)
4912                 nfs_increment_open_seqid(status, res->open_seqid);
4913         nfs_increment_lock_seqid(status, res->lock_seqid);
4914 out:
4915         return status;
4916 }
4917 
4918 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4919 {
4920         int status;
4921         status = decode_op_hdr(xdr, OP_LOCKT);
4922         if (status == -NFS4ERR_DENIED)
4923                 return decode_lock_denied(xdr, res->denied);
4924         return status;
4925 }
4926 
4927 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4928 {
4929         int status;
4930 
4931         status = decode_op_hdr(xdr, OP_LOCKU);
4932         if (status != -EIO)
4933                 nfs_increment_lock_seqid(status, res->seqid);
4934         if (status == 0)
4935                 status = decode_stateid(xdr, &res->stateid);
4936         return status;
4937 }
4938 
4939 static int decode_release_lockowner(struct xdr_stream *xdr)
4940 {
4941         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4942 }
4943 
4944 static int decode_lookup(struct xdr_stream *xdr)
4945 {
4946         return decode_op_hdr(xdr, OP_LOOKUP);
4947 }
4948 
4949 /* This is too sick! */
4950 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4951 {
4952         __be32 *p;
4953         uint32_t limit_type, nblocks, blocksize;
4954 
4955         p = xdr_inline_decode(xdr, 12);
4956         if (unlikely(!p))
4957                 goto out_overflow;
4958         limit_type = be32_to_cpup(p++);
4959         switch (limit_type) {
4960         case 1:
4961                 xdr_decode_hyper(p, maxsize);
4962                 break;
4963         case 2:
4964                 nblocks = be32_to_cpup(p++);
4965                 blocksize = be32_to_cpup(p);
4966                 *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4967         }
4968         return 0;
4969 out_overflow:
4970         print_overflow_msg(__func__, xdr);
4971         return -EIO;
4972 }
4973 
4974 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4975 {
4976         __be32 *p;
4977         uint32_t delegation_type;
4978         int status;
4979 
4980         p = xdr_inline_decode(xdr, 4);
4981         if (unlikely(!p))
4982                 goto out_overflow;
4983         delegation_type = be32_to_cpup(p);
4984         if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
4985                 res->delegation_type = 0;
4986                 return 0;
4987         }
4988         status = decode_stateid(xdr, &res->delegation);
4989         if (unlikely(status))
4990                 return status;
4991         p = xdr_inline_decode(xdr, 4);
4992         if (unlikely(!p))
4993                 goto out_overflow;
4994         res->do_recall = be32_to_cpup(p);
4995 
4996         switch (delegation_type) {
4997         case NFS4_OPEN_DELEGATE_READ:
4998                 res->delegation_type = FMODE_READ;
4999                 break;
5000         case NFS4_OPEN_DELEGATE_WRITE:
5001                 res->delegation_type = FMODE_WRITE|FMODE_READ;
5002                 if (decode_space_limit(xdr, &res->maxsize) < 0)
5003                                 return -EIO;
5004         }
5005         return decode_ace(xdr, NULL, res->server->nfs_client);
5006 out_overflow:
5007         print_overflow_msg(__func__, xdr);
5008         return -EIO;
5009 }
5010 
5011 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5012 {
5013         __be32 *p;
5014         uint32_t savewords, bmlen, i;
5015         int status;
5016 
5017         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5018                 return status;
5019         nfs_increment_open_seqid(status, res->seqid);
5020         if (status)
5021                 return status;
5022         status = decode_stateid(xdr, &res->stateid);
5023         if (unlikely(status))
5024                 return status;
5025 
5026         decode_change_info(xdr, &res->cinfo);
5027 
5028         p = xdr_inline_decode(xdr, 8);
5029         if (unlikely(!p))
5030                 goto out_overflow;
5031         res->rflags = be32_to_cpup(p++);
5032         bmlen = be32_to_cpup(p);
5033         if (bmlen > 10)
5034                 goto xdr_error;
5035 
5036         p = xdr_inline_decode(xdr, bmlen << 2);
5037         if (unlikely(!p))
5038                 goto out_overflow;
5039         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5040         for (i = 0; i < savewords; ++i)
5041                 res->attrset[i] = be32_to_cpup(p++);
5042         for (; i < NFS4_BITMAP_SIZE; i++)
5043                 res->attrset[i] = 0;
5044 
5045         return decode_delegation(xdr, res);
5046 xdr_error:
5047         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5048         return -EIO;
5049 out_overflow:
5050         print_overflow_msg(__func__, xdr);
5051         return -EIO;
5052 }
5053 
5054 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5055 {
5056         int status;
5057 
5058         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5059         if (status != -EIO)
5060                 nfs_increment_open_seqid(status, res->seqid);
5061         if (!status)
5062                 status = decode_stateid(xdr, &res->stateid);
5063         return status;
5064 }
5065 
5066 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5067 {
5068         int status;
5069 
5070         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5071         if (status != -EIO)
5072                 nfs_increment_open_seqid(status, res->seqid);
5073         if (!status)
5074                 status = decode_stateid(xdr, &res->stateid);
5075         return status;
5076 }
5077 
5078 static int decode_putfh(struct xdr_stream *xdr)
5079 {
5080         return decode_op_hdr(xdr, OP_PUTFH);
5081 }
5082 
5083 static int decode_putrootfh(struct xdr_stream *xdr)
5084 {
5085         return decode_op_hdr(xdr, OP_PUTROOTFH);
5086 }
5087 
5088 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
5089 {
5090         __be32 *p;
5091         uint32_t count, eof, recvd;
5092         int status;
5093 
5094         status = decode_op_hdr(xdr, OP_READ);
5095         if (status)
5096                 return status;
5097         p = xdr_inline_decode(xdr, 8);
5098         if (unlikely(!p))
5099                 goto out_overflow;
5100         eof = be32_to_cpup(p++);
5101         count = be32_to_cpup(p);
5102         recvd = xdr_read_pages(xdr, count);
5103         if (count > recvd) {
5104                 dprintk("NFS: server cheating in read reply: "
5105                                 "count %u > recvd %u\n", count, recvd);
5106                 count = recvd;
5107                 eof = 0;
5108         }
5109         res->eof = eof;
5110         res->count = count;
5111         return 0;
5112 out_overflow:
5113         print_overflow_msg(__func__, xdr);
5114         return -EIO;
5115 }
5116 
5117 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5118 {
5119         int             status;
5120         __be32          verf[2];
5121 
5122         status = decode_op_hdr(xdr, OP_READDIR);
5123         if (!status)
5124                 status = decode_verifier(xdr, readdir->verifier.data);
5125         if (unlikely(status))
5126                 return status;
5127         memcpy(verf, readdir->verifier.data, sizeof(verf));
5128         dprintk("%s: verifier = %08x:%08x\n",
5129                         __func__, verf[0], verf[1]);
5130         return xdr_read_pages(xdr, xdr->buf->page_len);
5131 }
5132 
5133 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5134 {
5135         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5136         u32 len, recvd;
5137         __be32 *p;
5138         int status;
5139 
5140         status = decode_op_hdr(xdr, OP_READLINK);
5141         if (status)
5142                 return status;
5143 
5144         /* Convert length of symlink */
5145         p = xdr_inline_decode(xdr, 4);
5146         if (unlikely(!p))
5147                 goto out_overflow;
5148         len = be32_to_cpup(p);
5149         if (len >= rcvbuf->page_len || len <= 0) {
5150                 dprintk("nfs: server returned giant symlink!\n");
5151                 return -ENAMETOOLONG;
5152         }
5153         recvd = xdr_read_pages(xdr, len);
5154         if (recvd < len) {
5155                 dprintk("NFS: server cheating in readlink reply: "
5156                                 "count %u > recvd %u\n", len, recvd);
5157                 return -EIO;
5158         }
5159         /*
5160          * The XDR encode routine has set things up so that
5161          * the link text will be copied directly into the
5162          * buffer.  We just have to do overflow-checking,
5163          * and and null-terminate the text (the VFS expects
5164          * null-termination).
5165          */
5166         xdr_terminate_string(rcvbuf, len);
5167         return 0;
5168 out_overflow:
5169         print_overflow_msg(__func__, xdr);
5170         return -EIO;
5171 }
5172 
5173 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5174 {
5175         int status;
5176 
5177         status = decode_op_hdr(xdr, OP_REMOVE);
5178         if (status)
5179                 goto out;
5180         status = decode_change_info(xdr, cinfo);
5181 out:
5182         return status;
5183 }
5184 
5185 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5186               struct nfs4_change_info *new_cinfo)
5187 {
5188         int status;
5189 
5190         status = decode_op_hdr(xdr, OP_RENAME);
5191         if (status)
5192                 goto out;
5193         if ((status = decode_change_info(xdr, old_cinfo)))
5194                 goto out;
5195         status = decode_change_info(xdr, new_cinfo);
5196 out:
5197         return status;
5198 }
5199 
5200 static int decode_renew(struct xdr_stream *xdr)
5201 {
5202         return decode_op_hdr(xdr, OP_RENEW);
5203 }
5204 
5205 static int
5206 decode_restorefh(struct xdr_stream *xdr)
5207 {
5208         return decode_op_hdr(xdr, OP_RESTOREFH);
5209 }
5210 
5211 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5212                          struct nfs_getaclres *res)
5213 {
5214         unsigned int savep;
5215         uint32_t attrlen,
5216                  bitmap[3] = {0};
5217         int status;
5218         unsigned int pg_offset;
5219 
5220         res->acl_len = 0;
5221         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5222                 goto out;
5223 
5224         xdr_enter_page(xdr, xdr->buf->page_len);
5225 
5226         /* Calculate the offset of the page data */
5227         pg_offset = xdr->buf->head[0].iov_len;
5228 
5229         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5230                 goto out;
5231         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5232                 goto out;
5233 
5234         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5235                 return -EIO;
5236         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5237 
5238                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5239                  * are stored with the acl data to handle the problem of
5240                  * variable length bitmaps.*/
5241                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5242                 res->acl_len = attrlen;
5243 
5244                 /* Check for receive buffer overflow */
5245                 if (res->acl_len > (xdr->nwords << 2) ||
5246                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5247                         res->acl_flags |= NFS4_ACL_TRUNC;
5248                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5249                                         attrlen, xdr->nwords << 2);
5250                 }
5251         } else
5252                 status = -EOPNOTSUPP;
5253 
5254 out:
5255         return status;
5256 }
5257 
5258 static int
5259 decode_savefh(struct xdr_stream *xdr)
5260 {
5261         return decode_op_hdr(xdr, OP_SAVEFH);
5262 }
5263 
5264 static int decode_setattr(struct xdr_stream *xdr)
5265 {
5266         __be32 *p;
5267         uint32_t bmlen;
5268         int status;
5269 
5270         status = decode_op_hdr(xdr, OP_SETATTR);
5271         if (status)
5272                 return status;
5273         p = xdr_inline_decode(xdr, 4);
5274         if (unlikely(!p))
5275                 goto out_overflow;
5276         bmlen = be32_to_cpup(p);
5277         p = xdr_inline_decode(xdr, bmlen << 2);
5278         if (likely(p))
5279                 return 0;
5280 out_overflow:
5281         print_overflow_msg(__func__, xdr);
5282         return -EIO;
5283 }
5284 
5285 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5286 {
5287         __be32 *p;
5288         uint32_t opnum;
5289         int32_t nfserr;
5290 
5291         p = xdr_inline_decode(xdr, 8);
5292         if (unlikely(!p))
5293                 goto out_overflow;
5294         opnum = be32_to_cpup(p++);
5295         if (opnum != OP_SETCLIENTID) {
5296                 dprintk("nfs: decode_setclientid: Server returned operation"
5297                         " %d\n", opnum);
5298                 return -EIO;
5299         }
5300         nfserr = be32_to_cpup(p);
5301         if (nfserr == NFS_OK) {
5302                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5303                 if (unlikely(!p))
5304                         goto out_overflow;
5305                 p = xdr_decode_hyper(p, &res->clientid);
5306                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5307         } else if (nfserr == NFSERR_CLID_INUSE) {
5308                 uint32_t len;
5309 
5310                 /* skip netid string */
5311                 p = xdr_inline_decode(xdr, 4);
5312                 if (unlikely(!p))
5313                         goto out_overflow;
5314                 len = be32_to_cpup(p);
5315                 p = xdr_inline_decode(xdr, len);
5316                 if (unlikely(!p))
5317                         goto out_overflow;
5318 
5319                 /* skip uaddr string */
5320                 p = xdr_inline_decode(xdr, 4);
5321                 if (unlikely(!p))
5322                         goto out_overflow;
5323                 len = be32_to_cpup(p);
5324                 p = xdr_inline_decode(xdr, len);
5325                 if (unlikely(!p))
5326                         goto out_overflow;
5327                 return -NFSERR_CLID_INUSE;
5328         } else
5329                 return nfs4_stat_to_errno(nfserr);
5330 
5331         return 0;
5332 out_overflow:
5333         print_overflow_msg(__func__, xdr);
5334         return -EIO;
5335 }
5336 
5337 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5338 {
5339         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5340 }
5341 
5342 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
5343 {
5344         __be32 *p;
5345         int status;
5346 
5347         status = decode_op_hdr(xdr, OP_WRITE);
5348         if (status)
5349                 return status;
5350 
5351         p = xdr_inline_decode(xdr, 8);
5352         if (unlikely(!p))
5353                 goto out_overflow;
5354         res->count = be32_to_cpup(p++);
5355         res->verf->committed = be32_to_cpup(p++);
5356         return decode_write_verifier(xdr, &res->verf->verifier);
5357 out_overflow:
5358         print_overflow_msg(__func__, xdr);
5359         return -EIO;
5360 }
5361 
5362 static int decode_delegreturn(struct xdr_stream *xdr)
5363 {
5364         return decode_op_hdr(xdr, OP_DELEGRETURN);
5365 }
5366 
5367 static int decode_secinfo_gss(struct xdr_stream *xdr,
5368                               struct nfs4_secinfo4 *flavor)
5369 {
5370         u32 oid_len;
5371         __be32 *p;
5372 
5373         p = xdr_inline_decode(xdr, 4);
5374         if (unlikely(!p))
5375                 goto out_overflow;
5376         oid_len = be32_to_cpup(p);
5377         if (oid_len > GSS_OID_MAX_LEN)
5378                 goto out_err;
5379 
5380         p = xdr_inline_decode(xdr, oid_len);
5381         if (unlikely(!p))
5382                 goto out_overflow;
5383         memcpy(flavor->flavor_info.oid.data, p, oid_len);
5384         flavor->flavor_info.oid.len = oid_len;
5385 
5386         p = xdr_inline_decode(xdr, 8);
5387         if (unlikely(!p))
5388                 goto out_overflow;
5389         flavor->flavor_info.qop = be32_to_cpup(p++);
5390         flavor->flavor_info.service = be32_to_cpup(p);
5391 
5392         return 0;
5393 
5394 out_overflow:
5395         print_overflow_msg(__func__, xdr);
5396         return -EIO;
5397 out_err:
5398         return -EINVAL;
5399 }
5400 
5401 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5402 {
5403         struct nfs4_secinfo4 *sec_flavor;
5404         unsigned int i, num_flavors;
5405         int status;
5406         __be32 *p;
5407 
5408         p = xdr_inline_decode(xdr, 4);
5409         if (unlikely(!p))
5410                 goto out_overflow;
5411 
5412         res->flavors->num_flavors = 0;
5413         num_flavors = be32_to_cpup(p);
5414 
5415         for (i = 0; i < num_flavors; i++) {
5416                 sec_flavor = &res->flavors->flavors[i];
5417                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5418                         break;
5419 
5420                 p = xdr_inline_decode(xdr, 4);
5421                 if (unlikely(!p))
5422                         goto out_overflow;
5423                 sec_flavor->flavor = be32_to_cpup(p);
5424 
5425                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5426                         status = decode_secinfo_gss(xdr, sec_flavor);
5427                         if (status)
5428                                 goto out;
5429                 }
5430                 res->flavors->num_flavors++;
5431         }
5432 
5433         status = 0;
5434 out:
5435         return status;
5436 out_overflow:
5437         print_overflow_msg(__func__, xdr);
5438         return -EIO;
5439 }
5440 
5441 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5442 {
5443         int status = decode_op_hdr(xdr, OP_SECINFO);
5444         if (status)
5445                 return status;
5446         return decode_secinfo_common(xdr, res);
5447 }
5448 
5449 #if defined(CONFIG_NFS_V4_1)
5450 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5451 {
5452         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5453         if (status)
5454                 return status;
5455         return decode_secinfo_common(xdr, res);
5456 }
5457 
5458 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5459 {
5460         __be32 *p;
5461         uint32_t bitmap_words;
5462         unsigned int i;
5463 
5464         p = xdr_inline_decode(xdr, 4);
5465         bitmap_words = be32_to_cpup(p++);
5466         if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5467                 return -EIO;
5468         p = xdr_inline_decode(xdr, 4 * bitmap_words);
5469         for (i = 0; i < bitmap_words; i++)
5470                 op_map->u.words[i] = be32_to_cpup(p++);
5471 
5472         return 0;
5473 }
5474 
5475 static int decode_exchange_id(struct xdr_stream *xdr,
5476                               struct nfs41_exchange_id_res *res)
5477 {
5478         __be32 *p;
5479         uint32_t dummy;
5480         char *dummy_str;
5481         int status;
5482         uint32_t impl_id_count;
5483 
5484         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5485         if (status)
5486                 return status;
5487 
5488         p = xdr_inline_decode(xdr, 8);
5489         if (unlikely(!p))
5490                 goto out_overflow;
5491         xdr_decode_hyper(p, &res->clientid);
5492         p = xdr_inline_decode(xdr, 12);
5493         if (unlikely(!p))
5494                 goto out_overflow;
5495         res->seqid = be32_to_cpup(p++);
5496         res->flags = be32_to_cpup(p++);
5497 
5498         res->state_protect.how = be32_to_cpup(p);
5499         switch (res->state_protect.how) {
5500         case SP4_NONE:
5501                 break;
5502         case SP4_MACH_CRED:
5503                 status = decode_op_map(xdr, &res->state_protect.enforce);
5504                 if (status)
5505                         return status;
5506                 status = decode_op_map(xdr, &res->state_protect.allow);
5507                 if (status)
5508                         return status;
5509                 break;
5510         default:
5511                 WARN_ON_ONCE(1);
5512                 return -EIO;
5513         }
5514 
5515         /* server_owner4.so_minor_id */
5516         p = xdr_inline_decode(xdr, 8);
5517         if (unlikely(!p))
5518                 goto out_overflow;
5519         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5520 
5521         /* server_owner4.so_major_id */
5522         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5523         if (unlikely(status))
5524                 return status;
5525         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5526                 return -EIO;
5527         memcpy(res->server_owner->major_id, dummy_str, dummy);
5528         res->server_owner->major_id_sz = dummy;
5529 
5530         /* server_scope4 */
5531         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5532         if (unlikely(status))
5533                 return status;
5534         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5535                 return -EIO;
5536         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5537         res->server_scope->server_scope_sz = dummy;
5538 
5539         /* Implementation Id */
5540         p = xdr_inline_decode(xdr, 4);
5541         if (unlikely(!p))
5542                 goto out_overflow;
5543         impl_id_count = be32_to_cpup(p++);
5544 
5545         if (impl_id_count) {
5546                 /* nii_domain */
5547                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5548                 if (unlikely(status))
5549                         return status;
5550                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5551                         return -EIO;
5552                 memcpy(res->impl_id->domain, dummy_str, dummy);
5553 
5554                 /* nii_name */
5555                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5556                 if (unlikely(status))
5557                         return status;
5558                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5559                         return -EIO;
5560                 memcpy(res->impl_id->name, dummy_str, dummy);
5561 
5562                 /* nii_date */
5563                 p = xdr_inline_decode(xdr, 12);
5564                 if (unlikely(!p))
5565                         goto out_overflow;
5566                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5567                 res->impl_id->date.nseconds = be32_to_cpup(p);
5568 
5569                 /* if there's more than one entry, ignore the rest */
5570         }
5571         return 0;
5572 out_overflow:
5573         print_overflow_msg(__func__, xdr);
5574         return -EIO;
5575 }
5576 
5577 static int decode_chan_attrs(struct xdr_stream *xdr,
5578                              struct nfs4_channel_attrs *attrs)
5579 {
5580         __be32 *p;
5581         u32 nr_attrs, val;
5582 
5583         p = xdr_inline_decode(xdr, 28);
5584         if (unlikely(!p))
5585                 goto out_overflow;
5586         val = be32_to_cpup(p++);        /* headerpadsz */
5587         if (val)
5588                 return -EINVAL;         /* no support for header padding yet */
5589         attrs->max_rqst_sz = be32_to_cpup(p++);
5590         attrs->max_resp_sz = be32_to_cpup(p++);
5591         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5592         attrs->max_ops = be32_to_cpup(p++);
5593         attrs->max_reqs = be32_to_cpup(p++);
5594         nr_attrs = be32_to_cpup(p);
5595         if (unlikely(nr_attrs > 1)) {
5596                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5597                         "count %u\n", __func__, nr_attrs);
5598                 return -EINVAL;
5599         }
5600         if (nr_attrs == 1) {
5601                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5602                 if (unlikely(!p))
5603                         goto out_overflow;
5604         }
5605         return 0;
5606 out_overflow:
5607         print_overflow_msg(__func__, xdr);
5608         return -EIO;
5609 }
5610 
5611 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5612 {
5613         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5614 }
5615 
5616 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5617                                 struct nfs41_bind_conn_to_session_res *res)
5618 {
5619         __be32 *p;
5620         int status;
5621 
5622         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5623         if (!status)
5624                 status = decode_sessionid(xdr, &res->session->sess_id);
5625         if (unlikely(status))
5626                 return status;
5627 
5628         /* dir flags, rdma mode bool */
5629         p = xdr_inline_decode(xdr, 8);
5630         if (unlikely(!p))
5631                 goto out_overflow;
5632 
5633         res->dir = be32_to_cpup(p++);
5634         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5635                 return -EIO;
5636         if (be32_to_cpup(p) == 0)
5637                 res->use_conn_in_rdma_mode = false;
5638         else
5639                 res->use_conn_in_rdma_mode = true;
5640 
5641         return 0;
5642 out_overflow:
5643         print_overflow_msg(__func__, xdr);
5644         return -EIO;
5645 }
5646 
5647 static int decode_create_session(struct xdr_stream *xdr,
5648                                  struct nfs41_create_session_res *res)
5649 {
5650         __be32 *p;
5651         int status;
5652         struct nfs_client *clp = res->client;
5653         struct nfs4_session *session = clp->cl_session;
5654 
5655         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5656         if (!status)
5657                 status = decode_sessionid(xdr, &session->sess_id);
5658         if (unlikely(status))
5659                 return status;
5660 
5661         /* seqid, flags */
5662         p = xdr_inline_decode(xdr, 8);
5663         if (unlikely(!p))
5664                 goto out_overflow;
5665         clp->cl_seqid = be32_to_cpup(p++);
5666         session->flags = be32_to_cpup(p);
5667 
5668         /* Channel attributes */
5669         status = decode_chan_attrs(xdr, &session->fc_attrs);
5670         if (!status)
5671                 status = decode_chan_attrs(xdr, &session->bc_attrs);
5672         return status;
5673 out_overflow:
5674         print_overflow_msg(__func__, xdr);
5675         return -EIO;
5676 }
5677 
5678 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5679 {
5680         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5681 }
5682 
5683 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5684 {
5685         return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5686 }
5687 
5688 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5689 {
5690         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5691 }
5692 #endif /* CONFIG_NFS_V4_1 */
5693 
5694 static int decode_sequence(struct xdr_stream *xdr,
5695                            struct nfs4_sequence_res *res,
5696                            struct rpc_rqst *rqstp)
5697 {
5698 #if defined(CONFIG_NFS_V4_1)
5699         struct nfs4_session *session;
5700         struct nfs4_sessionid id;
5701         u32 dummy;
5702         int status;
5703         __be32 *p;
5704 
5705         if (res->sr_slot == NULL)
5706                 return 0;
5707         if (!res->sr_slot->table->session)
5708                 return 0;
5709 
5710         status = decode_op_hdr(xdr, OP_SEQUENCE);
5711         if (!status)
5712                 status = decode_sessionid(xdr, &id);
5713         if (unlikely(status))
5714                 goto out_err;
5715 
5716         /*
5717          * If the server returns different values for sessionID, slotID or
5718          * sequence number, the server is looney tunes.
5719          */
5720         status = -EREMOTEIO;
5721         session = res->sr_slot->table->session;
5722 
5723         if (memcmp(id.data, session->sess_id.data,
5724                    NFS4_MAX_SESSIONID_LEN)) {
5725                 dprintk("%s Invalid session id\n", __func__);
5726                 goto out_err;
5727         }
5728 
5729         p = xdr_inline_decode(xdr, 20);
5730         if (unlikely(!p))
5731                 goto out_overflow;
5732 
5733         /* seqid */
5734         dummy = be32_to_cpup(p++);
5735         if (dummy != res->sr_slot->seq_nr) {
5736                 dprintk("%s Invalid sequence number\n", __func__);
5737                 goto out_err;
5738         }
5739         /* slot id */
5740         dummy = be32_to_cpup(p++);
5741         if (dummy != res->sr_slot->slot_nr) {
5742                 dprintk("%s Invalid slot id\n", __func__);
5743                 goto out_err;
5744         }
5745         /* highest slot id */
5746         res->sr_highest_slotid = be32_to_cpup(p++);
5747         /* target highest slot id */
5748         res->sr_target_highest_slotid = be32_to_cpup(p++);
5749         /* result flags */
5750         res->sr_status_flags = be32_to_cpup(p);
5751         status = 0;
5752 out_err:
5753         res->sr_status = status;
5754         return status;
5755 out_overflow:
5756         print_overflow_msg(__func__, xdr);
5757         status = -EIO;
5758         goto out_err;
5759 #else  /* CONFIG_NFS_V4_1 */
5760         return 0;
5761 #endif /* CONFIG_NFS_V4_1 */
5762 }
5763 
5764 #if defined(CONFIG_NFS_V4_1)
5765 /*
5766  * TODO: Need to handle case when EOF != true;
5767  */
5768 static int decode_getdevicelist(struct xdr_stream *xdr,
5769                                 struct pnfs_devicelist *res)
5770 {
5771         __be32 *p;
5772         int status, i;
5773         nfs4_verifier verftemp;
5774 
5775         status = decode_op_hdr(xdr, OP_GETDEVICELIST);
5776         if (status)
5777                 return status;
5778 
5779         p = xdr_inline_decode(xdr, 8 + 8 + 4);
5780         if (unlikely(!p))
5781                 goto out_overflow;
5782 
5783         /* TODO: Skip cookie for now */
5784         p += 2;
5785 
5786         /* Read verifier */
5787         p = xdr_decode_opaque_fixed(p, verftemp.data, NFS4_VERIFIER_SIZE);
5788 
5789         res->num_devs = be32_to_cpup(p);
5790 
5791         dprintk("%s: num_dev %d\n", __func__, res->num_devs);
5792 
5793         if (res->num_devs > NFS4_PNFS_GETDEVLIST_MAXNUM) {
5794                 printk(KERN_ERR "NFS: %s too many result dev_num %u\n",
5795                                 __func__, res->num_devs);
5796                 return -EIO;
5797         }
5798 
5799         p = xdr_inline_decode(xdr,
5800                               res->num_devs * NFS4_DEVICEID4_SIZE + 4);
5801         if (unlikely(!p))
5802                 goto out_overflow;
5803         for (i = 0; i < res->num_devs; i++)
5804                 p = xdr_decode_opaque_fixed(p, res->dev_id[i].data,
5805                                             NFS4_DEVICEID4_SIZE);
5806         res->eof = be32_to_cpup(p);
5807         return 0;
5808 out_overflow:
5809         print_overflow_msg(__func__, xdr);
5810         return -EIO;
5811 }
5812 
5813 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5814                                 struct pnfs_device *pdev)
5815 {
5816         __be32 *p;
5817         uint32_t len, type;
5818         int status;
5819 
5820         status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5821         if (status) {
5822                 if (status == -ETOOSMALL) {
5823                         p = xdr_inline_decode(xdr, 4);
5824                         if (unlikely(!p))
5825                                 goto out_overflow;
5826                         pdev->mincount = be32_to_cpup(p);
5827                         dprintk("%s: Min count too small. mincnt = %u\n",
5828                                 __func__, pdev->mincount);
5829                 }
5830                 return status;
5831         }
5832 
5833         p = xdr_inline_decode(xdr, 8);
5834         if (unlikely(!p))
5835                 goto out_overflow;
5836         type = be32_to_cpup(p++);
5837         if (type != pdev->layout_type) {
5838                 dprintk("%s: layout mismatch req: %u pdev: %u\n",
5839                         __func__, pdev->layout_type, type);
5840                 return -EINVAL;
5841         }
5842         /*
5843          * Get the length of the opaque device_addr4. xdr_read_pages places
5844          * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5845          * and places the remaining xdr data in xdr_buf->tail
5846          */
5847         pdev->mincount = be32_to_cpup(p);
5848         if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
5849                 goto out_overflow;
5850 
5851         /* Parse notification bitmap, verifying that it is zero. */
5852         p = xdr_inline_decode(xdr, 4);
5853         if (unlikely(!p))
5854                 goto out_overflow;
5855         len = be32_to_cpup(p);
5856         if (len) {
5857                 uint32_t i;
5858 
5859                 p = xdr_inline_decode(xdr, 4 * len);
5860                 if (unlikely(!p))
5861                         goto out_overflow;
5862                 for (i = 0; i < len; i++, p++) {
5863                         if (be32_to_cpup(p)) {
5864                                 dprintk("%s: notifications not supported\n",
5865                                         __func__);
5866                                 return -EIO;
5867                         }
5868                 }
5869         }
5870         return 0;
5871 out_overflow:
5872         print_overflow_msg(__func__, xdr);
5873         return -EIO;
5874 }
5875 
5876 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5877                             struct nfs4_layoutget_res *res)
5878 {
5879         __be32 *p;
5880         int status;
5881         u32 layout_count;
5882         u32 recvd;
5883 
5884         status = decode_op_hdr(xdr, OP_LAYOUTGET);
5885         if (status)
5886                 return status;
5887         p = xdr_inline_decode(xdr, 4);
5888         if (unlikely(!p))
5889                 goto out_overflow;
5890         res->return_on_close = be32_to_cpup(p);
5891         decode_stateid(xdr, &res->stateid);
5892         p = xdr_inline_decode(xdr, 4);
5893         if (unlikely(!p))
5894                 goto out_overflow;
5895         layout_count = be32_to_cpup(p);
5896         if (!layout_count) {
5897                 dprintk("%s: server responded with empty layout array\n",
5898                         __func__);
5899                 return -EINVAL;
5900         }
5901 
5902         p = xdr_inline_decode(xdr, 28);
5903         if (unlikely(!p))
5904                 goto out_overflow;
5905         p = xdr_decode_hyper(p, &res->range.offset);
5906         p = xdr_decode_hyper(p, &res->range.length);
5907         res->range.iomode = be32_to_cpup(p++);
5908         res->type = be32_to_cpup(p++);
5909         res->layoutp->len = be32_to_cpup(p);
5910 
5911         dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
5912                 __func__,
5913                 (unsigned long)res->range.offset,
5914                 (unsigned long)res->range.length,
5915                 res->range.iomode,
5916                 res->type,
5917                 res->layoutp->len);
5918 
5919         recvd = xdr_read_pages(xdr, res->layoutp->len);
5920         if (res->layoutp->len > recvd) {
5921                 dprintk("NFS: server cheating in layoutget reply: "
5922                                 "layout len %u > recvd %u\n",
5923                                 res->layoutp->len, recvd);
5924                 return -EINVAL;
5925         }
5926 
5927         if (layout_count > 1) {
5928                 /* We only handle a length one array at the moment.  Any
5929                  * further entries are just ignored.  Note that this means
5930                  * the client may see a response that is less than the
5931                  * minimum it requested.
5932                  */
5933                 dprintk("%s: server responded with %d layouts, dropping tail\n",
5934                         __func__, layout_count);
5935         }
5936 
5937         return 0;
5938 out_overflow:
5939         print_overflow_msg(__func__, xdr);
5940         return -EIO;
5941 }
5942 
5943 static int decode_layoutreturn(struct xdr_stream *xdr,
5944                                struct nfs4_layoutreturn_res *res)
5945 {
5946         __be32 *p;
5947         int status;
5948 
5949         status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
5950         if (status)
5951                 return status;
5952         p = xdr_inline_decode(xdr, 4);
5953         if (unlikely(!p))