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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 
 56 #include "nfs4_fs.h"
 57 #include "internal.h"
 58 #include "nfs4idmap.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                                 /* client name */ \
143                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
144                                 1 /* sc_prog */ + \
145                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
146                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
147                                 1) /* sc_cb_ident */
148 #define decode_setclientid_maxsz \
149                                 (op_decode_hdr_maxsz + \
150                                 2 /* clientid */ + \
151                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
152                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
153                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
154 #define encode_setclientid_confirm_maxsz \
155                                 (op_encode_hdr_maxsz + \
156                                 3 + (NFS4_VERIFIER_SIZE >> 2))
157 #define decode_setclientid_confirm_maxsz \
158                                 (op_decode_hdr_maxsz)
159 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
160 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
161 #define encode_share_access_maxsz \
162                                 (2)
163 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
164 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
165 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
166 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
167                                 2 + encode_share_access_maxsz + 2 + \
168                                 open_owner_id_maxsz + \
169                                 encode_opentype_maxsz + \
170                                 encode_claim_null_maxsz)
171 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
172 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
173                                 decode_ace_maxsz)
174 #define decode_change_info_maxsz        (5)
175 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
176                                 decode_stateid_maxsz + \
177                                 decode_change_info_maxsz + 1 + \
178                                 nfs4_fattr_bitmap_maxsz + \
179                                 decode_delegation_maxsz)
180 #define encode_open_confirm_maxsz \
181                                 (op_encode_hdr_maxsz + \
182                                  encode_stateid_maxsz + 1)
183 #define decode_open_confirm_maxsz \
184                                 (op_decode_hdr_maxsz + \
185                                  decode_stateid_maxsz)
186 #define encode_open_downgrade_maxsz \
187                                 (op_encode_hdr_maxsz + \
188                                  encode_stateid_maxsz + 1 + \
189                                  encode_share_access_maxsz)
190 #define decode_open_downgrade_maxsz \
191                                 (op_decode_hdr_maxsz + \
192                                  decode_stateid_maxsz)
193 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
194                                  1 + encode_stateid_maxsz)
195 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
196                                  decode_stateid_maxsz)
197 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
198                                  encode_stateid_maxsz + \
199                                  encode_attrs_maxsz)
200 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
201                                  nfs4_fattr_bitmap_maxsz)
202 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
203                                  encode_stateid_maxsz + 3)
204 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
205 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
206                                  2 + encode_verifier_maxsz + 5 + \
207                                 nfs4_label_maxsz)
208 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
209                                  decode_verifier_maxsz)
210 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
211 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
212 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
213                                  encode_stateid_maxsz + 4)
214 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
215                                  2 + decode_verifier_maxsz)
216 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
217 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
218                                  decode_verifier_maxsz)
219 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
220                                 nfs4_name_maxsz)
221 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
222                                  decode_change_info_maxsz)
223 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
224                                 2 * nfs4_name_maxsz)
225 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
226                                  decode_change_info_maxsz + \
227                                  decode_change_info_maxsz)
228 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
229                                 nfs4_name_maxsz)
230 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
231 #define encode_lockowner_maxsz  (7)
232 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
233                                  7 + \
234                                  1 + encode_stateid_maxsz + 1 + \
235                                  encode_lockowner_maxsz)
236 #define decode_lock_denied_maxsz \
237                                 (8 + decode_lockowner_maxsz)
238 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
239                                  decode_lock_denied_maxsz)
240 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
241                                 encode_lockowner_maxsz)
242 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
243                                  decode_lock_denied_maxsz)
244 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
245                                  encode_stateid_maxsz + \
246                                  4)
247 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
248                                  decode_stateid_maxsz)
249 #define encode_release_lockowner_maxsz \
250                                 (op_encode_hdr_maxsz + \
251                                  encode_lockowner_maxsz)
252 #define decode_release_lockowner_maxsz \
253                                 (op_decode_hdr_maxsz)
254 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
255 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
256 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
257                                 1 + nfs4_name_maxsz + \
258                                 1 + \
259                                 nfs4_fattr_maxsz)
260 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
261 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
262                                 1 + 2 + nfs4_name_maxsz + \
263                                 encode_attrs_maxsz)
264 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
265                                 decode_change_info_maxsz + \
266                                 nfs4_fattr_bitmap_maxsz)
267 #define encode_statfs_maxsz     (encode_getattr_maxsz)
268 #define decode_statfs_maxsz     (decode_getattr_maxsz)
269 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
270 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
271 #define encode_getacl_maxsz     (encode_getattr_maxsz)
272 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
273                                  nfs4_fattr_bitmap_maxsz + 1)
274 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
275                                  encode_stateid_maxsz + 3)
276 #define decode_setacl_maxsz     (decode_setattr_maxsz)
277 #define encode_fs_locations_maxsz \
278                                 (encode_getattr_maxsz)
279 #define decode_fs_locations_maxsz \
280                                 (0)
281 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
282 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
283 
284 #if defined(CONFIG_NFS_V4_1)
285 #define NFS4_MAX_MACHINE_NAME_LEN (64)
286 #define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
287                          sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
288 
289 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
290                                 encode_verifier_maxsz + \
291                                 1 /* co_ownerid.len */ + \
292                                 /* eia_clientowner */ \
293                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
294                                 1 /* flags */ + \
295                                 1 /* spa_how */ + \
296                                 /* max is SP4_MACH_CRED (for now) */ + \
297                                 1 + NFS4_OP_MAP_NUM_WORDS + \
298                                 1 + NFS4_OP_MAP_NUM_WORDS + \
299                                 1 /* implementation id array of size 1 */ + \
300                                 1 /* nii_domain */ + \
301                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
302                                 1 /* nii_name */ + \
303                                 XDR_QUADLEN(IMPL_NAME_LIMIT) + \
304                                 3 /* nii_date */)
305 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
306                                 2 /* eir_clientid */ + \
307                                 1 /* eir_sequenceid */ + \
308                                 1 /* eir_flags */ + \
309                                 1 /* spr_how */ + \
310                                   /* max is SP4_MACH_CRED (for now) */ + \
311                                 1 + NFS4_OP_MAP_NUM_WORDS + \
312                                 1 + NFS4_OP_MAP_NUM_WORDS + \
313                                 2 /* eir_server_owner.so_minor_id */ + \
314                                 /* eir_server_owner.so_major_id<> */ \
315                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
316                                 /* eir_server_scope<> */ \
317                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
318                                 1 /* eir_server_impl_id array length */ + \
319                                 1 /* nii_domain */ + \
320                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
321                                 1 /* nii_name */ + \
322                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
323                                 3 /* nii_date */)
324 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
325 #define decode_channel_attrs_maxsz  (6 + \
326                                      1 /* ca_rdma_ird.len */ + \
327                                      1 /* ca_rdma_ird */)
328 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
329                                      2 /* csa_clientid */ + \
330                                      1 /* csa_sequence */ + \
331                                      1 /* csa_flags */ + \
332                                      encode_channel_attrs_maxsz + \
333                                      encode_channel_attrs_maxsz + \
334                                      1 /* csa_cb_program */ + \
335                                      1 /* csa_sec_parms.len (1) */ + \
336                                      1 /* cb_secflavor (AUTH_SYS) */ + \
337                                      1 /* stamp */ + \
338                                      1 /* machinename.len */ + \
339                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
340                                      1 /* uid */ + \
341                                      1 /* gid */ + \
342                                      1 /* gids.len (0) */)
343 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
344                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
345                                      1 /* csr_sequence */ + \
346                                      1 /* csr_flags */ + \
347                                      decode_channel_attrs_maxsz + \
348                                      decode_channel_attrs_maxsz)
349 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
350                                      /* bctsa_sessid */ \
351                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
352                                      1 /* bctsa_dir */ + \
353                                      1 /* bctsa_use_conn_in_rdma_mode */)
354 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
355                                      /* bctsr_sessid */ \
356                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
357                                      1 /* bctsr_dir */ + \
358                                      1 /* bctsr_use_conn_in_rdma_mode */)
359 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
360 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
361 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
362 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
363 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
364                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
365 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
366                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
367 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
368 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
369 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
370                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
371                                 1 /* layout type */ + \
372                                 1 /* maxcount */ + \
373                                 1 /* bitmap size */ + \
374                                 1 /* notification bitmap length */ + \
375                                 1 /* notification bitmap, word 0 */)
376 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
377                                 1 /* layout type */ + \
378                                 1 /* opaque devaddr4 length */ + \
379                                   /* devaddr4 payload is read into page */ \
380                                 1 /* notification bitmap length */ + \
381                                 1 /* notification bitmap, word 0 */)
382 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
383                                 encode_stateid_maxsz)
384 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
385                                 decode_stateid_maxsz + \
386                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
387 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
388                                 2 /* offset */ + \
389                                 2 /* length */ + \
390                                 1 /* reclaim */ + \
391                                 encode_stateid_maxsz + \
392                                 1 /* new offset (true) */ + \
393                                 2 /* last byte written */ + \
394                                 1 /* nt_timechanged (false) */ + \
395                                 1 /* layoutupdate4 layout type */ + \
396                                 1 /* layoutupdate4 opaqueue len */)
397                                   /* the actual content of layoutupdate4 should
398                                      be allocated by drivers and spliced in
399                                      using xdr_write_pages */
400 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
401 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
402                                 encode_stateid_maxsz + \
403                                 1 /* FIXME: opaque lrf_body always empty at the moment */)
404 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
405                                 1 + decode_stateid_maxsz)
406 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
407 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
408 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
409                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
410 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
411 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
412                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
413 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz)
414 #else /* CONFIG_NFS_V4_1 */
415 #define encode_sequence_maxsz   0
416 #define decode_sequence_maxsz   0
417 #endif /* CONFIG_NFS_V4_1 */
418 
419 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
420 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
421 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
422                                 encode_sequence_maxsz + \
423                                 encode_putfh_maxsz + \
424                                 encode_read_maxsz)
425 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
426                                 decode_sequence_maxsz + \
427                                 decode_putfh_maxsz + \
428                                 decode_read_maxsz)
429 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
430                                 encode_sequence_maxsz + \
431                                 encode_putfh_maxsz + \
432                                 encode_readlink_maxsz)
433 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
434                                 decode_sequence_maxsz + \
435                                 decode_putfh_maxsz + \
436                                 decode_readlink_maxsz)
437 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
438                                 encode_sequence_maxsz + \
439                                 encode_putfh_maxsz + \
440                                 encode_readdir_maxsz)
441 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
442                                 decode_sequence_maxsz + \
443                                 decode_putfh_maxsz + \
444                                 decode_readdir_maxsz)
445 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
446                                 encode_sequence_maxsz + \
447                                 encode_putfh_maxsz + \
448                                 encode_write_maxsz + \
449                                 encode_getattr_maxsz)
450 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
451                                 decode_sequence_maxsz + \
452                                 decode_putfh_maxsz + \
453                                 decode_write_maxsz + \
454                                 decode_getattr_maxsz)
455 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
456                                 encode_sequence_maxsz + \
457                                 encode_putfh_maxsz + \
458                                 encode_commit_maxsz)
459 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
460                                 decode_sequence_maxsz + \
461                                 decode_putfh_maxsz + \
462                                 decode_commit_maxsz)
463 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
464                                 encode_sequence_maxsz + \
465                                 encode_putfh_maxsz + \
466                                 encode_open_maxsz + \
467                                 encode_access_maxsz + \
468                                 encode_getfh_maxsz + \
469                                 encode_getattr_maxsz)
470 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
471                                 decode_sequence_maxsz + \
472                                 decode_putfh_maxsz + \
473                                 decode_open_maxsz + \
474                                 decode_access_maxsz + \
475                                 decode_getfh_maxsz + \
476                                 decode_getattr_maxsz)
477 #define NFS4_enc_open_confirm_sz \
478                                 (compound_encode_hdr_maxsz + \
479                                  encode_putfh_maxsz + \
480                                  encode_open_confirm_maxsz)
481 #define NFS4_dec_open_confirm_sz \
482                                 (compound_decode_hdr_maxsz + \
483                                  decode_putfh_maxsz + \
484                                  decode_open_confirm_maxsz)
485 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
486                                         encode_sequence_maxsz + \
487                                         encode_putfh_maxsz + \
488                                         encode_open_maxsz + \
489                                         encode_access_maxsz + \
490                                         encode_getattr_maxsz)
491 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
492                                         decode_sequence_maxsz + \
493                                         decode_putfh_maxsz + \
494                                         decode_open_maxsz + \
495                                         decode_access_maxsz + \
496                                         decode_getattr_maxsz)
497 #define NFS4_enc_open_downgrade_sz \
498                                 (compound_encode_hdr_maxsz + \
499                                  encode_sequence_maxsz + \
500                                  encode_putfh_maxsz + \
501                                  encode_open_downgrade_maxsz + \
502                                  encode_getattr_maxsz)
503 #define NFS4_dec_open_downgrade_sz \
504                                 (compound_decode_hdr_maxsz + \
505                                  decode_sequence_maxsz + \
506                                  decode_putfh_maxsz + \
507                                  decode_open_downgrade_maxsz + \
508                                  decode_getattr_maxsz)
509 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
510                                  encode_sequence_maxsz + \
511                                  encode_putfh_maxsz + \
512                                  encode_close_maxsz + \
513                                  encode_getattr_maxsz)
514 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
515                                  decode_sequence_maxsz + \
516                                  decode_putfh_maxsz + \
517                                  decode_close_maxsz + \
518                                  decode_getattr_maxsz)
519 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
520                                  encode_sequence_maxsz + \
521                                  encode_putfh_maxsz + \
522                                  encode_setattr_maxsz + \
523                                  encode_getattr_maxsz)
524 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
525                                  decode_sequence_maxsz + \
526                                  decode_putfh_maxsz + \
527                                  decode_setattr_maxsz + \
528                                  decode_getattr_maxsz)
529 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
530                                 encode_sequence_maxsz + \
531                                 encode_putfh_maxsz + \
532                                 encode_fsinfo_maxsz)
533 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
534                                 decode_sequence_maxsz + \
535                                 decode_putfh_maxsz + \
536                                 decode_fsinfo_maxsz)
537 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
538                                 encode_renew_maxsz)
539 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
540                                 decode_renew_maxsz)
541 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
542                                 encode_setclientid_maxsz)
543 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
544                                 decode_setclientid_maxsz)
545 #define NFS4_enc_setclientid_confirm_sz \
546                                 (compound_encode_hdr_maxsz + \
547                                 encode_setclientid_confirm_maxsz)
548 #define NFS4_dec_setclientid_confirm_sz \
549                                 (compound_decode_hdr_maxsz + \
550                                 decode_setclientid_confirm_maxsz)
551 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
552                                 encode_sequence_maxsz + \
553                                 encode_putfh_maxsz + \
554                                 encode_lock_maxsz)
555 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
556                                 decode_sequence_maxsz + \
557                                 decode_putfh_maxsz + \
558                                 decode_lock_maxsz)
559 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
560                                 encode_sequence_maxsz + \
561                                 encode_putfh_maxsz + \
562                                 encode_lockt_maxsz)
563 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
564                                  decode_sequence_maxsz + \
565                                  decode_putfh_maxsz + \
566                                  decode_lockt_maxsz)
567 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
568                                 encode_sequence_maxsz + \
569                                 encode_putfh_maxsz + \
570                                 encode_locku_maxsz)
571 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
572                                 decode_sequence_maxsz + \
573                                 decode_putfh_maxsz + \
574                                 decode_locku_maxsz)
575 #define NFS4_enc_release_lockowner_sz \
576                                 (compound_encode_hdr_maxsz + \
577                                  encode_lockowner_maxsz)
578 #define NFS4_dec_release_lockowner_sz \
579                                 (compound_decode_hdr_maxsz + \
580                                  decode_lockowner_maxsz)
581 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
582                                 encode_sequence_maxsz + \
583                                 encode_putfh_maxsz + \
584                                 encode_access_maxsz + \
585                                 encode_getattr_maxsz)
586 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
587                                 decode_sequence_maxsz + \
588                                 decode_putfh_maxsz + \
589                                 decode_access_maxsz + \
590                                 decode_getattr_maxsz)
591 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
592                                 encode_sequence_maxsz + \
593                                 encode_putfh_maxsz + \
594                                 encode_getattr_maxsz + \
595                                 encode_renew_maxsz)
596 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
597                                 decode_sequence_maxsz + \
598                                 decode_putfh_maxsz + \
599                                 decode_getattr_maxsz + \
600                                 decode_renew_maxsz)
601 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
602                                 encode_sequence_maxsz + \
603                                 encode_putfh_maxsz + \
604                                 encode_lookup_maxsz + \
605                                 encode_getattr_maxsz + \
606                                 encode_getfh_maxsz)
607 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
608                                 decode_sequence_maxsz + \
609                                 decode_putfh_maxsz + \
610                                 decode_lookup_maxsz + \
611                                 decode_getattr_maxsz + \
612                                 decode_getfh_maxsz)
613 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
614                                 encode_sequence_maxsz + \
615                                 encode_putrootfh_maxsz + \
616                                 encode_getattr_maxsz + \
617                                 encode_getfh_maxsz)
618 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
619                                 decode_sequence_maxsz + \
620                                 decode_putrootfh_maxsz + \
621                                 decode_getattr_maxsz + \
622                                 decode_getfh_maxsz)
623 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
624                                 encode_sequence_maxsz + \
625                                 encode_putfh_maxsz + \
626                                 encode_remove_maxsz)
627 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
628                                 decode_sequence_maxsz + \
629                                 decode_putfh_maxsz + \
630                                 decode_remove_maxsz)
631 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
632                                 encode_sequence_maxsz + \
633                                 encode_putfh_maxsz + \
634                                 encode_savefh_maxsz + \
635                                 encode_putfh_maxsz + \
636                                 encode_rename_maxsz)
637 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
638                                 decode_sequence_maxsz + \
639                                 decode_putfh_maxsz + \
640                                 decode_savefh_maxsz + \
641                                 decode_putfh_maxsz + \
642                                 decode_rename_maxsz)
643 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
644                                 encode_sequence_maxsz + \
645                                 encode_putfh_maxsz + \
646                                 encode_savefh_maxsz + \
647                                 encode_putfh_maxsz + \
648                                 encode_link_maxsz + \
649                                 encode_restorefh_maxsz + \
650                                 encode_getattr_maxsz)
651 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
652                                 decode_sequence_maxsz + \
653                                 decode_putfh_maxsz + \
654                                 decode_savefh_maxsz + \
655                                 decode_putfh_maxsz + \
656                                 decode_link_maxsz + \
657                                 decode_restorefh_maxsz + \
658                                 decode_getattr_maxsz)
659 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
660                                 encode_sequence_maxsz + \
661                                 encode_putfh_maxsz + \
662                                 encode_symlink_maxsz + \
663                                 encode_getattr_maxsz + \
664                                 encode_getfh_maxsz)
665 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
666                                 decode_sequence_maxsz + \
667                                 decode_putfh_maxsz + \
668                                 decode_symlink_maxsz + \
669                                 decode_getattr_maxsz + \
670                                 decode_getfh_maxsz)
671 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
672                                 encode_sequence_maxsz + \
673                                 encode_putfh_maxsz + \
674                                 encode_create_maxsz + \
675                                 encode_getfh_maxsz + \
676                                 encode_getattr_maxsz)
677 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
678                                 decode_sequence_maxsz + \
679                                 decode_putfh_maxsz + \
680                                 decode_create_maxsz + \
681                                 decode_getfh_maxsz + \
682                                 decode_getattr_maxsz)
683 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
684                                 encode_sequence_maxsz + \
685                                 encode_putfh_maxsz + \
686                                 encode_getattr_maxsz)
687 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
688                                 decode_sequence_maxsz + \
689                                 decode_putfh_maxsz + \
690                                 decode_getattr_maxsz)
691 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
692                                 encode_sequence_maxsz + \
693                                 encode_putfh_maxsz + \
694                                 encode_statfs_maxsz)
695 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
696                                 decode_sequence_maxsz + \
697                                 decode_putfh_maxsz + \
698                                 decode_statfs_maxsz)
699 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
700                                 encode_sequence_maxsz + \
701                                 encode_putfh_maxsz + \
702                                 encode_getattr_maxsz)
703 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
704                                 decode_sequence_maxsz + \
705                                 decode_putfh_maxsz + \
706                                 decode_getattr_maxsz)
707 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
708                                 encode_sequence_maxsz + \
709                                 encode_putfh_maxsz + \
710                                 encode_delegreturn_maxsz + \
711                                 encode_getattr_maxsz)
712 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
713                                 decode_sequence_maxsz + \
714                                 decode_delegreturn_maxsz + \
715                                 decode_getattr_maxsz)
716 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
717                                 encode_sequence_maxsz + \
718                                 encode_putfh_maxsz + \
719                                 encode_getacl_maxsz)
720 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
721                                 decode_sequence_maxsz + \
722                                 decode_putfh_maxsz + \
723                                 decode_getacl_maxsz)
724 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
725                                 encode_sequence_maxsz + \
726                                 encode_putfh_maxsz + \
727                                 encode_setacl_maxsz)
728 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
729                                 decode_sequence_maxsz + \
730                                 decode_putfh_maxsz + \
731                                 decode_setacl_maxsz)
732 #define NFS4_enc_fs_locations_sz \
733                                 (compound_encode_hdr_maxsz + \
734                                  encode_sequence_maxsz + \
735                                  encode_putfh_maxsz + \
736                                  encode_lookup_maxsz + \
737                                  encode_fs_locations_maxsz + \
738                                  encode_renew_maxsz)
739 #define NFS4_dec_fs_locations_sz \
740                                 (compound_decode_hdr_maxsz + \
741                                  decode_sequence_maxsz + \
742                                  decode_putfh_maxsz + \
743                                  decode_lookup_maxsz + \
744                                  decode_fs_locations_maxsz + \
745                                  decode_renew_maxsz)
746 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
747                                 encode_sequence_maxsz + \
748                                 encode_putfh_maxsz + \
749                                 encode_secinfo_maxsz)
750 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
751                                 decode_sequence_maxsz + \
752                                 decode_putfh_maxsz + \
753                                 decode_secinfo_maxsz)
754 #define NFS4_enc_fsid_present_sz \
755                                 (compound_encode_hdr_maxsz + \
756                                  encode_sequence_maxsz + \
757                                  encode_putfh_maxsz + \
758                                  encode_getfh_maxsz + \
759                                  encode_renew_maxsz)
760 #define NFS4_dec_fsid_present_sz \
761                                 (compound_decode_hdr_maxsz + \
762                                  decode_sequence_maxsz + \
763                                  decode_putfh_maxsz + \
764                                  decode_getfh_maxsz + \
765                                  decode_renew_maxsz)
766 #if defined(CONFIG_NFS_V4_1)
767 #define NFS4_enc_bind_conn_to_session_sz \
768                                 (compound_encode_hdr_maxsz + \
769                                  encode_bind_conn_to_session_maxsz)
770 #define NFS4_dec_bind_conn_to_session_sz \
771                                 (compound_decode_hdr_maxsz + \
772                                  decode_bind_conn_to_session_maxsz)
773 #define NFS4_enc_exchange_id_sz \
774                                 (compound_encode_hdr_maxsz + \
775                                  encode_exchange_id_maxsz)
776 #define NFS4_dec_exchange_id_sz \
777                                 (compound_decode_hdr_maxsz + \
778                                  decode_exchange_id_maxsz)
779 #define NFS4_enc_create_session_sz \
780                                 (compound_encode_hdr_maxsz + \
781                                  encode_create_session_maxsz)
782 #define NFS4_dec_create_session_sz \
783                                 (compound_decode_hdr_maxsz + \
784                                  decode_create_session_maxsz)
785 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
786                                          encode_destroy_session_maxsz)
787 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
788                                          decode_destroy_session_maxsz)
789 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
790                                          encode_destroy_clientid_maxsz)
791 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
792                                          decode_destroy_clientid_maxsz)
793 #define NFS4_enc_sequence_sz \
794                                 (compound_decode_hdr_maxsz + \
795                                  encode_sequence_maxsz)
796 #define NFS4_dec_sequence_sz \
797                                 (compound_decode_hdr_maxsz + \
798                                  decode_sequence_maxsz)
799 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
800                                          encode_sequence_maxsz + \
801                                          encode_putrootfh_maxsz + \
802                                          encode_fsinfo_maxsz)
803 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
804                                          decode_sequence_maxsz + \
805                                          decode_putrootfh_maxsz + \
806                                          decode_fsinfo_maxsz)
807 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
808                                          encode_sequence_maxsz + \
809                                          encode_reclaim_complete_maxsz)
810 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
811                                          decode_sequence_maxsz + \
812                                          decode_reclaim_complete_maxsz)
813 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
814                                 encode_sequence_maxsz +\
815                                 encode_getdeviceinfo_maxsz)
816 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
817                                 decode_sequence_maxsz + \
818                                 decode_getdeviceinfo_maxsz)
819 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
820                                 encode_sequence_maxsz + \
821                                 encode_putfh_maxsz +        \
822                                 encode_layoutget_maxsz)
823 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
824                                 decode_sequence_maxsz + \
825                                 decode_putfh_maxsz +        \
826                                 decode_layoutget_maxsz)
827 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
828                                 encode_sequence_maxsz +\
829                                 encode_putfh_maxsz + \
830                                 encode_layoutcommit_maxsz + \
831                                 encode_getattr_maxsz)
832 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
833                                 decode_sequence_maxsz + \
834                                 decode_putfh_maxsz + \
835                                 decode_layoutcommit_maxsz + \
836                                 decode_getattr_maxsz)
837 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
838                                 encode_sequence_maxsz + \
839                                 encode_putfh_maxsz + \
840                                 encode_layoutreturn_maxsz)
841 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
842                                 decode_sequence_maxsz + \
843                                 decode_putfh_maxsz + \
844                                 decode_layoutreturn_maxsz)
845 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
846                                         encode_sequence_maxsz + \
847                                         encode_putrootfh_maxsz +\
848                                         encode_secinfo_no_name_maxsz)
849 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
850                                         decode_sequence_maxsz + \
851                                         decode_putrootfh_maxsz + \
852                                         decode_secinfo_no_name_maxsz)
853 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
854                                          encode_sequence_maxsz + \
855                                          encode_test_stateid_maxsz)
856 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
857                                          decode_sequence_maxsz + \
858                                          decode_test_stateid_maxsz)
859 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
860                                          encode_sequence_maxsz + \
861                                          encode_free_stateid_maxsz)
862 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
863                                          decode_sequence_maxsz + \
864                                          decode_free_stateid_maxsz)
865 
866 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
867                                       compound_encode_hdr_maxsz +
868                                       encode_sequence_maxsz +
869                                       encode_putfh_maxsz +
870                                       encode_getattr_maxsz) *
871                                      XDR_UNIT);
872 
873 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
874                                      compound_decode_hdr_maxsz +
875                                      decode_sequence_maxsz +
876                                      decode_putfh_maxsz) *
877                                     XDR_UNIT);
878 
879 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
880                                            compound_decode_hdr_maxsz +
881                                            decode_sequence_maxsz) *
882                                           XDR_UNIT);
883 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
884 #endif /* CONFIG_NFS_V4_1 */
885 
886 static const umode_t nfs_type2fmt[] = {
887         [NF4BAD] = 0,
888         [NF4REG] = S_IFREG,
889         [NF4DIR] = S_IFDIR,
890         [NF4BLK] = S_IFBLK,
891         [NF4CHR] = S_IFCHR,
892         [NF4LNK] = S_IFLNK,
893         [NF4SOCK] = S_IFSOCK,
894         [NF4FIFO] = S_IFIFO,
895         [NF4ATTRDIR] = 0,
896         [NF4NAMEDATTR] = 0,
897 };
898 
899 struct compound_hdr {
900         int32_t         status;
901         uint32_t        nops;
902         __be32 *        nops_p;
903         uint32_t        taglen;
904         char *          tag;
905         uint32_t        replen;         /* expected reply words */
906         u32             minorversion;
907 };
908 
909 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
910 {
911         __be32 *p = xdr_reserve_space(xdr, nbytes);
912         BUG_ON(!p);
913         return p;
914 }
915 
916 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
917 {
918         __be32 *p;
919 
920         p = xdr_reserve_space(xdr, len);
921         xdr_encode_opaque_fixed(p, buf, len);
922 }
923 
924 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
925 {
926         __be32 *p;
927 
928         p = reserve_space(xdr, 4 + len);
929         xdr_encode_opaque(p, str, len);
930 }
931 
932 static void encode_uint32(struct xdr_stream *xdr, u32 n)
933 {
934         __be32 *p;
935 
936         p = reserve_space(xdr, 4);
937         *p = cpu_to_be32(n);
938 }
939 
940 static void encode_uint64(struct xdr_stream *xdr, u64 n)
941 {
942         __be32 *p;
943 
944         p = reserve_space(xdr, 8);
945         xdr_encode_hyper(p, n);
946 }
947 
948 static void encode_nfs4_seqid(struct xdr_stream *xdr,
949                 const struct nfs_seqid *seqid)
950 {
951         if (seqid != NULL)
952                 encode_uint32(xdr, seqid->sequence->counter);
953         else
954                 encode_uint32(xdr, 0);
955 }
956 
957 static void encode_compound_hdr(struct xdr_stream *xdr,
958                                 struct rpc_rqst *req,
959                                 struct compound_hdr *hdr)
960 {
961         __be32 *p;
962         struct rpc_auth *auth = req->rq_cred->cr_auth;
963 
964         /* initialize running count of expected bytes in reply.
965          * NOTE: the replied tag SHOULD be the same is the one sent,
966          * but this is not required as a MUST for the server to do so. */
967         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
968 
969         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
970         encode_string(xdr, hdr->taglen, hdr->tag);
971         p = reserve_space(xdr, 8);
972         *p++ = cpu_to_be32(hdr->minorversion);
973         hdr->nops_p = p;
974         *p = cpu_to_be32(hdr->nops);
975 }
976 
977 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
978                 uint32_t replen,
979                 struct compound_hdr *hdr)
980 {
981         encode_uint32(xdr, op);
982         hdr->nops++;
983         hdr->replen += replen;
984 }
985 
986 static void encode_nops(struct compound_hdr *hdr)
987 {
988         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
989         *hdr->nops_p = htonl(hdr->nops);
990 }
991 
992 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
993 {
994         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
995 }
996 
997 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
998 {
999         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1000 }
1001 
1002 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1003                                 const struct nfs4_label *label,
1004                                 const struct nfs_server *server)
1005 {
1006         char owner_name[IDMAP_NAMESZ];
1007         char owner_group[IDMAP_NAMESZ];
1008         int owner_namelen = 0;
1009         int owner_grouplen = 0;
1010         __be32 *p;
1011         unsigned i;
1012         uint32_t len = 0;
1013         uint32_t bmval_len;
1014         uint32_t bmval[3] = { 0 };
1015 
1016         /*
1017          * We reserve enough space to write the entire attribute buffer at once.
1018          * In the worst-case, this would be
1019          * 16(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
1020          * = 40 bytes, plus any contribution from variable-length fields
1021          *            such as owner/group.
1022          */
1023         if (iap->ia_valid & ATTR_SIZE) {
1024                 bmval[0] |= FATTR4_WORD0_SIZE;
1025                 len += 8;
1026         }
1027         if (iap->ia_valid & ATTR_MODE) {
1028                 bmval[1] |= FATTR4_WORD1_MODE;
1029                 len += 4;
1030         }
1031         if (iap->ia_valid & ATTR_UID) {
1032                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1033                 if (owner_namelen < 0) {
1034                         dprintk("nfs: couldn't resolve uid %d to string\n",
1035                                         from_kuid(&init_user_ns, iap->ia_uid));
1036                         /* XXX */
1037                         strcpy(owner_name, "nobody");
1038                         owner_namelen = sizeof("nobody") - 1;
1039                         /* goto out; */
1040                 }
1041                 bmval[1] |= FATTR4_WORD1_OWNER;
1042                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1043         }
1044         if (iap->ia_valid & ATTR_GID) {
1045                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1046                 if (owner_grouplen < 0) {
1047                         dprintk("nfs: couldn't resolve gid %d to string\n",
1048                                         from_kgid(&init_user_ns, iap->ia_gid));
1049                         strcpy(owner_group, "nobody");
1050                         owner_grouplen = sizeof("nobody") - 1;
1051                         /* goto out; */
1052                 }
1053                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1054                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1055         }
1056         if (iap->ia_valid & ATTR_ATIME_SET) {
1057                 bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1058                 len += 16;
1059         } else if (iap->ia_valid & ATTR_ATIME) {
1060                 bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1061                 len += 4;
1062         }
1063         if (iap->ia_valid & ATTR_MTIME_SET) {
1064                 bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1065                 len += 16;
1066         } else if (iap->ia_valid & ATTR_MTIME) {
1067                 bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1068                 len += 4;
1069         }
1070         if (label) {
1071                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1072                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1073         }
1074 
1075         if (bmval[2] != 0)
1076                 bmval_len = 3;
1077         else if (bmval[1] != 0)
1078                 bmval_len = 2;
1079         else
1080                 bmval_len = 1;
1081 
1082         p = reserve_space(xdr, 4 + (bmval_len << 2) + 4 + len);
1083 
1084         *p++ = cpu_to_be32(bmval_len);
1085         for (i = 0; i < bmval_len; i++)
1086                 *p++ = cpu_to_be32(bmval[i]);
1087         *p++ = cpu_to_be32(len);
1088 
1089         if (bmval[0] & FATTR4_WORD0_SIZE)
1090                 p = xdr_encode_hyper(p, iap->ia_size);
1091         if (bmval[1] & FATTR4_WORD1_MODE)
1092                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1093         if (bmval[1] & FATTR4_WORD1_OWNER)
1094                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1095         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1096                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1097         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1098                 if (iap->ia_valid & ATTR_ATIME_SET) {
1099                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1100                         p = xdr_encode_hyper(p, (s64)iap->ia_atime.tv_sec);
1101                         *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
1102                 } else
1103                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1104         }
1105         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1106                 if (iap->ia_valid & ATTR_MTIME_SET) {
1107                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1108                         p = xdr_encode_hyper(p, (s64)iap->ia_mtime.tv_sec);
1109                         *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
1110                 } else
1111                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1112         }
1113         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
1114                 *p++ = cpu_to_be32(label->lfs);
1115                 *p++ = cpu_to_be32(label->pi);
1116                 *p++ = cpu_to_be32(label->len);
1117                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1118         }
1119 
1120 /* out: */
1121 }
1122 
1123 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1124 {
1125         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1126         encode_uint32(xdr, access);
1127 }
1128 
1129 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1130 {
1131         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1132         encode_nfs4_seqid(xdr, arg->seqid);
1133         encode_nfs4_stateid(xdr, &arg->stateid);
1134 }
1135 
1136 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1137 {
1138         __be32 *p;
1139 
1140         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1141         p = reserve_space(xdr, 12);
1142         p = xdr_encode_hyper(p, args->offset);
1143         *p = cpu_to_be32(args->count);
1144 }
1145 
1146 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1147 {
1148         __be32 *p;
1149 
1150         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1151         encode_uint32(xdr, create->ftype);
1152 
1153         switch (create->ftype) {
1154         case NF4LNK:
1155                 p = reserve_space(xdr, 4);
1156                 *p = cpu_to_be32(create->u.symlink.len);
1157                 xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
1158                 break;
1159 
1160         case NF4BLK: case NF4CHR:
1161                 p = reserve_space(xdr, 8);
1162                 *p++ = cpu_to_be32(create->u.device.specdata1);
1163                 *p = cpu_to_be32(create->u.device.specdata2);
1164                 break;
1165 
1166         default:
1167                 break;
1168         }
1169 
1170         encode_string(xdr, create->name->len, create->name->name);
1171         encode_attrs(xdr, create->attrs, create->label, create->server);
1172 }
1173 
1174 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
1175 {
1176         __be32 *p;
1177 
1178         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1179         p = reserve_space(xdr, 8);
1180         *p++ = cpu_to_be32(1);
1181         *p = cpu_to_be32(bitmap);
1182 }
1183 
1184 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
1185 {
1186         __be32 *p;
1187 
1188         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1189         p = reserve_space(xdr, 12);
1190         *p++ = cpu_to_be32(2);
1191         *p++ = cpu_to_be32(bm0);
1192         *p = cpu_to_be32(bm1);
1193 }
1194 
1195 static void
1196 encode_getattr_three(struct xdr_stream *xdr,
1197                      uint32_t bm0, uint32_t bm1, uint32_t bm2,
1198                      struct compound_hdr *hdr)
1199 {
1200         __be32 *p;
1201 
1202         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1203         if (bm2) {
1204                 p = reserve_space(xdr, 16);
1205                 *p++ = cpu_to_be32(3);
1206                 *p++ = cpu_to_be32(bm0);
1207                 *p++ = cpu_to_be32(bm1);
1208                 *p = cpu_to_be32(bm2);
1209         } else if (bm1) {
1210                 p = reserve_space(xdr, 12);
1211                 *p++ = cpu_to_be32(2);
1212                 *p++ = cpu_to_be32(bm0);
1213                 *p = cpu_to_be32(bm1);
1214         } else {
1215                 p = reserve_space(xdr, 8);
1216                 *p++ = cpu_to_be32(1);
1217                 *p = cpu_to_be32(bm0);
1218         }
1219 }
1220 
1221 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1222 {
1223         encode_getattr_three(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1224                            bitmask[1] & nfs4_fattr_bitmap[1],
1225                            bitmask[2] & nfs4_fattr_bitmap[2],
1226                            hdr);
1227 }
1228 
1229 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1230                                  const u32 *open_bitmap,
1231                                  struct compound_hdr *hdr)
1232 {
1233         encode_getattr_three(xdr,
1234                              bitmask[0] & open_bitmap[0],
1235                              bitmask[1] & open_bitmap[1],
1236                              bitmask[2] & open_bitmap[2],
1237                              hdr);
1238 }
1239 
1240 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1241 {
1242         encode_getattr_three(xdr,
1243                              bitmask[0] & nfs4_fsinfo_bitmap[0],
1244                              bitmask[1] & nfs4_fsinfo_bitmap[1],
1245                              bitmask[2] & nfs4_fsinfo_bitmap[2],
1246                              hdr);
1247 }
1248 
1249 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1250 {
1251         encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1252                            bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1253 }
1254 
1255 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1256 {
1257         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1258 }
1259 
1260 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1261 {
1262         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1263         encode_string(xdr, name->len, name->name);
1264 }
1265 
1266 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1267 {
1268         if (fl->fl_type == F_RDLCK)
1269                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1270         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1271 }
1272 
1273 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1274 {
1275         if (fl->fl_end == OFFSET_MAX)
1276                 return ~(uint64_t)0;
1277         return fl->fl_end - fl->fl_start + 1;
1278 }
1279 
1280 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1281 {
1282         __be32 *p;
1283 
1284         p = reserve_space(xdr, 32);
1285         p = xdr_encode_hyper(p, lowner->clientid);
1286         *p++ = cpu_to_be32(20);
1287         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1288         *p++ = cpu_to_be32(lowner->s_dev);
1289         xdr_encode_hyper(p, lowner->id);
1290 }
1291 
1292 /*
1293  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1294  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1295  */
1296 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1297 {
1298         __be32 *p;
1299 
1300         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1301         p = reserve_space(xdr, 28);
1302         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1303         *p++ = cpu_to_be32(args->reclaim);
1304         p = xdr_encode_hyper(p, args->fl->fl_start);
1305         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1306         *p = cpu_to_be32(args->new_lock_owner);
1307         if (args->new_lock_owner){
1308                 encode_nfs4_seqid(xdr, args->open_seqid);
1309                 encode_nfs4_stateid(xdr, &args->open_stateid);
1310                 encode_nfs4_seqid(xdr, args->lock_seqid);
1311                 encode_lockowner(xdr, &args->lock_owner);
1312         }
1313         else {
1314                 encode_nfs4_stateid(xdr, &args->lock_stateid);
1315                 encode_nfs4_seqid(xdr, args->lock_seqid);
1316         }
1317 }
1318 
1319 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1320 {
1321         __be32 *p;
1322 
1323         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1324         p = reserve_space(xdr, 20);
1325         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1326         p = xdr_encode_hyper(p, args->fl->fl_start);
1327         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1328         encode_lockowner(xdr, &args->lock_owner);
1329 }
1330 
1331 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1332 {
1333         __be32 *p;
1334 
1335         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1336         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1337         encode_nfs4_seqid(xdr, args->seqid);
1338         encode_nfs4_stateid(xdr, &args->stateid);
1339         p = reserve_space(xdr, 16);
1340         p = xdr_encode_hyper(p, args->fl->fl_start);
1341         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1342 }
1343 
1344 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1345 {
1346         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1347         encode_lockowner(xdr, lowner);
1348 }
1349 
1350 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1351 {
1352         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1353         encode_string(xdr, name->len, name->name);
1354 }
1355 
1356 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1357 {
1358         __be32 *p;
1359 
1360         p = reserve_space(xdr, 8);
1361         *p++ = cpu_to_be32(share_access);
1362         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1363 }
1364 
1365 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1366 {
1367         __be32 *p;
1368  /*
1369  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1370  * owner 4 = 32
1371  */
1372         encode_nfs4_seqid(xdr, arg->seqid);
1373         encode_share_access(xdr, arg->share_access);
1374         p = reserve_space(xdr, 36);
1375         p = xdr_encode_hyper(p, arg->clientid);
1376         *p++ = cpu_to_be32(24);
1377         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1378         *p++ = cpu_to_be32(arg->server->s_dev);
1379         *p++ = cpu_to_be32(arg->id.uniquifier);
1380         xdr_encode_hyper(p, arg->id.create_time);
1381 }
1382 
1383 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1384 {
1385         struct iattr dummy;
1386         __be32 *p;
1387 
1388         p = reserve_space(xdr, 4);
1389         switch(arg->createmode) {
1390         case NFS4_CREATE_UNCHECKED:
1391                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1392                 encode_attrs(xdr, arg->u.attrs, arg->label, arg->server);
1393                 break;
1394         case NFS4_CREATE_GUARDED:
1395                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1396                 encode_attrs(xdr, arg->u.attrs, arg->label, arg->server);
1397                 break;
1398         case NFS4_CREATE_EXCLUSIVE:
1399                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1400                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1401                 break;
1402         case NFS4_CREATE_EXCLUSIVE4_1:
1403                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1404                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1405                 dummy.ia_valid = 0;
1406                 encode_attrs(xdr, &dummy, arg->label, arg->server);
1407         }
1408 }
1409 
1410 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1411 {
1412         __be32 *p;
1413 
1414         p = reserve_space(xdr, 4);
1415         switch (arg->open_flags & O_CREAT) {
1416         case 0:
1417                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1418                 break;
1419         default:
1420                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1421                 encode_createmode(xdr, arg);
1422         }
1423 }
1424 
1425 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1426 {
1427         __be32 *p;
1428 
1429         p = reserve_space(xdr, 4);
1430         switch (delegation_type) {
1431         case 0:
1432                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1433                 break;
1434         case FMODE_READ:
1435                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1436                 break;
1437         case FMODE_WRITE|FMODE_READ:
1438                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1439                 break;
1440         default:
1441                 BUG();
1442         }
1443 }
1444 
1445 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1446 {
1447         __be32 *p;
1448 
1449         p = reserve_space(xdr, 4);
1450         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1451         encode_string(xdr, name->len, name->name);
1452 }
1453 
1454 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1455 {
1456         __be32 *p;
1457 
1458         p = reserve_space(xdr, 4);
1459         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1460         encode_delegation_type(xdr, type);
1461 }
1462 
1463 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1464 {
1465         __be32 *p;
1466 
1467         p = reserve_space(xdr, 4);
1468         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1469         encode_nfs4_stateid(xdr, stateid);
1470         encode_string(xdr, name->len, name->name);
1471 }
1472 
1473 static inline void encode_claim_fh(struct xdr_stream *xdr)
1474 {
1475         __be32 *p;
1476 
1477         p = reserve_space(xdr, 4);
1478         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1479 }
1480 
1481 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1482 {
1483         __be32 *p;
1484 
1485         p = reserve_space(xdr, 4);
1486         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1487         encode_nfs4_stateid(xdr, stateid);
1488 }
1489 
1490 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1491 {
1492         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1493         encode_openhdr(xdr, arg);
1494         encode_opentype(xdr, arg);
1495         switch (arg->claim) {
1496         case NFS4_OPEN_CLAIM_NULL:
1497                 encode_claim_null(xdr, arg->name);
1498                 break;
1499         case NFS4_OPEN_CLAIM_PREVIOUS:
1500                 encode_claim_previous(xdr, arg->u.delegation_type);
1501                 break;
1502         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1503                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1504                 break;
1505         case NFS4_OPEN_CLAIM_FH:
1506                 encode_claim_fh(xdr);
1507                 break;
1508         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1509                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1510                 break;
1511         default:
1512                 BUG();
1513         }
1514 }
1515 
1516 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1517 {
1518         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1519         encode_nfs4_stateid(xdr, arg->stateid);
1520         encode_nfs4_seqid(xdr, arg->seqid);
1521 }
1522 
1523 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1524 {
1525         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1526         encode_nfs4_stateid(xdr, &arg->stateid);
1527         encode_nfs4_seqid(xdr, arg->seqid);
1528         encode_share_access(xdr, arg->share_access);
1529 }
1530 
1531 static void
1532 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1533 {
1534         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1535         encode_string(xdr, fh->size, fh->data);
1536 }
1537 
1538 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1539 {
1540         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1541 }
1542 
1543 static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1544                         struct compound_hdr *hdr)
1545 {
1546         __be32 *p;
1547 
1548         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1549         encode_nfs4_stateid(xdr, &args->stateid);
1550 
1551         p = reserve_space(xdr, 12);
1552         p = xdr_encode_hyper(p, args->offset);
1553         *p = cpu_to_be32(args->count);
1554 }
1555 
1556 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1557 {
1558         uint32_t attrs[3] = {
1559                 FATTR4_WORD0_RDATTR_ERROR,
1560                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1561         };
1562         uint32_t dircount = readdir->count >> 1;
1563         __be32 *p, verf[2];
1564         uint32_t attrlen = 0;
1565         unsigned int i;
1566 
1567         if (readdir->plus) {
1568                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1569                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1570                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1571                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1572                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1573                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1574                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1575                 dircount >>= 1;
1576         }
1577         /* Use mounted_on_fileid only if the server supports it */
1578         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1579                 attrs[0] |= FATTR4_WORD0_FILEID;
1580         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1581                 attrs[i] &= readdir->bitmask[i];
1582                 if (attrs[i] != 0)
1583                         attrlen = i+1;
1584         }
1585 
1586         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1587         encode_uint64(xdr, readdir->cookie);
1588         encode_nfs4_verifier(xdr, &readdir->verifier);
1589         p = reserve_space(xdr, 12 + (attrlen << 2));
1590         *p++ = cpu_to_be32(dircount);
1591         *p++ = cpu_to_be32(readdir->count);
1592         *p++ = cpu_to_be32(attrlen);
1593         for (i = 0; i < attrlen; i++)
1594                 *p++ = cpu_to_be32(attrs[i]);
1595         memcpy(verf, readdir->verifier.data, sizeof(verf));
1596 
1597         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1598                         __func__,
1599                         (unsigned long long)readdir->cookie,
1600                         verf[0], verf[1],
1601                         attrs[0] & readdir->bitmask[0],
1602                         attrs[1] & readdir->bitmask[1],
1603                         attrs[2] & readdir->bitmask[2]);
1604 }
1605 
1606 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1607 {
1608         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1609 }
1610 
1611 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1612 {
1613         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1614         encode_string(xdr, name->len, name->name);
1615 }
1616 
1617 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1618 {
1619         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1620         encode_string(xdr, oldname->len, oldname->name);
1621         encode_string(xdr, newname->len, newname->name);
1622 }
1623 
1624 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1625                          struct compound_hdr *hdr)
1626 {
1627         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1628         encode_uint64(xdr, clid);
1629 }
1630 
1631 static void
1632 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1633 {
1634         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1635 }
1636 
1637 static void
1638 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1639 {
1640         __be32 *p;
1641 
1642         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1643         encode_nfs4_stateid(xdr, &zero_stateid);
1644         p = reserve_space(xdr, 2*4);
1645         *p++ = cpu_to_be32(1);
1646         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1647         p = reserve_space(xdr, 4);
1648         *p = cpu_to_be32(arg->acl_len);
1649         xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1650 }
1651 
1652 static void
1653 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1654 {
1655         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1656 }
1657 
1658 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1659 {
1660         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1661         encode_nfs4_stateid(xdr, &arg->stateid);
1662         encode_attrs(xdr, arg->iap, arg->label, server);
1663 }
1664 
1665 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1666 {
1667         __be32 *p;
1668 
1669         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1670         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1671 
1672         encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1673                         setclientid->sc_clnt->cl_owner_id);
1674         p = reserve_space(xdr, 4);
1675         *p = cpu_to_be32(setclientid->sc_prog);
1676         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1677         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1678         p = reserve_space(xdr, 4);
1679         *p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1680 }
1681 
1682 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1683 {
1684         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1685                         decode_setclientid_confirm_maxsz, hdr);
1686         encode_uint64(xdr, arg->clientid);
1687         encode_nfs4_verifier(xdr, &arg->confirm);
1688 }
1689 
1690 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1691                          struct compound_hdr *hdr)
1692 {
1693         __be32 *p;
1694 
1695         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1696         encode_nfs4_stateid(xdr, &args->stateid);
1697 
1698         p = reserve_space(xdr, 16);
1699         p = xdr_encode_hyper(p, args->offset);
1700         *p++ = cpu_to_be32(args->stable);
1701         *p = cpu_to_be32(args->count);
1702 
1703         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1704 }
1705 
1706 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1707 {
1708         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1709         encode_nfs4_stateid(xdr, stateid);
1710 }
1711 
1712 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1713 {
1714         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1715         encode_string(xdr, name->len, name->name);
1716 }
1717 
1718 #if defined(CONFIG_NFS_V4_1)
1719 /* NFSv4.1 operations */
1720 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1721                                    struct nfs41_bind_conn_to_session_args *args,
1722                                    struct compound_hdr *hdr)
1723 {
1724         __be32 *p;
1725 
1726         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1727                 decode_bind_conn_to_session_maxsz, hdr);
1728         encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1729         p = xdr_reserve_space(xdr, 8);
1730         *p++ = cpu_to_be32(args->dir);
1731         *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1732 }
1733 
1734 static void encode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
1735 {
1736         unsigned int i;
1737         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1738         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1739                 encode_uint32(xdr, op_map->u.words[i]);
1740 }
1741 
1742 static void encode_exchange_id(struct xdr_stream *xdr,
1743                                struct nfs41_exchange_id_args *args,
1744                                struct compound_hdr *hdr)
1745 {
1746         __be32 *p;
1747         char impl_name[IMPL_NAME_LIMIT];
1748         int len = 0;
1749 
1750         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1751         encode_nfs4_verifier(xdr, args->verifier);
1752 
1753         encode_string(xdr, strlen(args->client->cl_owner_id),
1754                         args->client->cl_owner_id);
1755 
1756         encode_uint32(xdr, args->flags);
1757         encode_uint32(xdr, args->state_protect.how);
1758 
1759         switch (args->state_protect.how) {
1760         case SP4_NONE:
1761                 break;
1762         case SP4_MACH_CRED:
1763                 encode_op_map(xdr, &args->state_protect.enforce);
1764                 encode_op_map(xdr, &args->state_protect.allow);
1765                 break;
1766         default:
1767                 WARN_ON_ONCE(1);
1768                 break;
1769         }
1770 
1771         if (send_implementation_id &&
1772             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1773             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1774                 <= sizeof(impl_name) + 1)
1775                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1776                                utsname()->sysname, utsname()->release,
1777                                utsname()->version, utsname()->machine);
1778 
1779         if (len > 0) {
1780                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1781 
1782                 encode_string(xdr,
1783                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1784                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1785                 encode_string(xdr, len, impl_name);
1786                 /* just send zeros for nii_date - the date is in nii_name */
1787                 p = reserve_space(xdr, 12);
1788                 p = xdr_encode_hyper(p, 0);
1789                 *p = cpu_to_be32(0);
1790         } else
1791                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1792 }
1793 
1794 static void encode_create_session(struct xdr_stream *xdr,
1795                                   struct nfs41_create_session_args *args,
1796                                   struct compound_hdr *hdr)
1797 {
1798         __be32 *p;
1799         struct nfs_client *clp = args->client;
1800         struct rpc_clnt *clnt = clp->cl_rpcclient;
1801         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1802         u32 max_resp_sz_cached;
1803 
1804         /*
1805          * Assumes OPEN is the biggest non-idempotent compound.
1806          * 2 is the verifier.
1807          */
1808         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1809                               RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1810 
1811         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1812         p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1813         p = xdr_encode_hyper(p, args->clientid);
1814         *p++ = cpu_to_be32(args->seqid);                        /*Sequence id */
1815         *p++ = cpu_to_be32(args->flags);                        /*flags */
1816 
1817         /* Fore Channel */
1818         *p++ = cpu_to_be32(0);                          /* header padding size */
1819         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1820         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1821         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1822         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1823         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1824         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1825 
1826         /* Back Channel */
1827         *p++ = cpu_to_be32(0);                          /* header padding size */
1828         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1829         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1830         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1831         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1832         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1833         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1834 
1835         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1836         *p++ = cpu_to_be32(1);
1837         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1838 
1839         /* authsys_parms rfc1831 */
1840         *p++ = cpu_to_be32(nn->boot_time.tv_nsec);      /* stamp */
1841         p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1842         *p++ = cpu_to_be32(0);                          /* UID */
1843         *p++ = cpu_to_be32(0);                          /* GID */
1844         *p = cpu_to_be32(0);                            /* No more gids */
1845 }
1846 
1847 static void encode_destroy_session(struct xdr_stream *xdr,
1848                                    struct nfs4_session *session,
1849                                    struct compound_hdr *hdr)
1850 {
1851         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1852         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1853 }
1854 
1855 static void encode_destroy_clientid(struct xdr_stream *xdr,
1856                                    uint64_t clientid,
1857                                    struct compound_hdr *hdr)
1858 {
1859         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1860         encode_uint64(xdr, clientid);
1861 }
1862 
1863 static void encode_reclaim_complete(struct xdr_stream *xdr,
1864                                     struct nfs41_reclaim_complete_args *args,
1865                                     struct compound_hdr *hdr)
1866 {
1867         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1868         encode_uint32(xdr, args->one_fs);
1869 }
1870 #endif /* CONFIG_NFS_V4_1 */
1871 
1872 static void encode_sequence(struct xdr_stream *xdr,
1873                             const struct nfs4_sequence_args *args,
1874                             struct compound_hdr *hdr)
1875 {
1876 #if defined(CONFIG_NFS_V4_1)
1877         struct nfs4_session *session;
1878         struct nfs4_slot_table *tp;
1879         struct nfs4_slot *slot = args->sa_slot;
1880         __be32 *p;
1881 
1882         tp = slot->table;
1883         session = tp->session;
1884         if (!session)
1885                 return;
1886 
1887         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1888 
1889         /*
1890          * Sessionid + seqid + slotid + max slotid + cache_this
1891          */
1892         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1893                 "max_slotid=%d cache_this=%d\n",
1894                 __func__,
1895                 ((u32 *)session->sess_id.data)[0],
1896                 ((u32 *)session->sess_id.data)[1],
1897                 ((u32 *)session->sess_id.data)[2],
1898                 ((u32 *)session->sess_id.data)[3],
1899                 slot->seq_nr, slot->slot_nr,
1900                 tp->highest_used_slotid, args->sa_cache_this);
1901         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1902         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1903         *p++ = cpu_to_be32(slot->seq_nr);
1904         *p++ = cpu_to_be32(slot->slot_nr);
1905         *p++ = cpu_to_be32(tp->highest_used_slotid);
1906         *p = cpu_to_be32(args->sa_cache_this);
1907 #endif /* CONFIG_NFS_V4_1 */
1908 }
1909 
1910 #ifdef CONFIG_NFS_V4_1
1911 static void
1912 encode_getdeviceinfo(struct xdr_stream *xdr,
1913                      const struct nfs4_getdeviceinfo_args *args,
1914                      struct compound_hdr *hdr)
1915 {
1916         __be32 *p;
1917 
1918         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1919         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1920         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1921                                     NFS4_DEVICEID4_SIZE);
1922         *p++ = cpu_to_be32(args->pdev->layout_type);
1923         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1924 
1925         p = reserve_space(xdr, 4 + 4);
1926         *p++ = cpu_to_be32(1);                  /* bitmap length */
1927         *p++ = cpu_to_be32(args->notify_types);
1928 }
1929 
1930 static void
1931 encode_layoutget(struct xdr_stream *xdr,
1932                       const struct nfs4_layoutget_args *args,
1933                       struct compound_hdr *hdr)
1934 {
1935         __be32 *p;
1936 
1937         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1938         p = reserve_space(xdr, 36);
1939         *p++ = cpu_to_be32(0);     /* Signal layout available */
1940         *p++ = cpu_to_be32(args->type);
1941         *p++ = cpu_to_be32(args->range.iomode);
1942         p = xdr_encode_hyper(p, args->range.offset);
1943         p = xdr_encode_hyper(p, args->range.length);
1944         p = xdr_encode_hyper(p, args->minlength);
1945         encode_nfs4_stateid(xdr, &args->stateid);
1946         encode_uint32(xdr, args->maxcount);
1947 
1948         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1949                 __func__,
1950                 args->type,
1951                 args->range.iomode,
1952                 (unsigned long)args->range.offset,
1953                 (unsigned long)args->range.length,
1954                 args->maxcount);
1955 }
1956 
1957 static int
1958 encode_layoutcommit(struct xdr_stream *xdr,
1959                     struct inode *inode,
1960                     struct nfs4_layoutcommit_args *args,
1961                     struct compound_hdr *hdr)
1962 {
1963         __be32 *p;
1964 
1965         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
1966                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
1967 
1968         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
1969         p = reserve_space(xdr, 20);
1970         /* Only whole file layouts */
1971         p = xdr_encode_hyper(p, 0); /* offset */
1972         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
1973         *p = cpu_to_be32(0); /* reclaim */
1974         encode_nfs4_stateid(xdr, &args->stateid);
1975         p = reserve_space(xdr, 20);
1976         *p++ = cpu_to_be32(1); /* newoffset = TRUE */
1977         p = xdr_encode_hyper(p, args->lastbytewritten);
1978         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
1979         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
1980 
1981         if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit) {
1982                 NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
1983                         NFS_I(inode)->layout, xdr, args);
1984         } else {
1985                 encode_uint32(xdr, args->layoutupdate_len);
1986                 if (args->layoutupdate_pages) {
1987                         xdr_write_pages(xdr, args->layoutupdate_pages, 0,
1988                                         args->layoutupdate_len);
1989                 }
1990         }
1991 
1992         return 0;
1993 }
1994 
1995 static void
1996 encode_layoutreturn(struct xdr_stream *xdr,
1997                     const struct nfs4_layoutreturn_args *args,
1998                     struct compound_hdr *hdr)
1999 {
2000         __be32 *p;
2001 
2002         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2003         p = reserve_space(xdr, 16);
2004         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2005         *p++ = cpu_to_be32(args->layout_type);
2006         *p++ = cpu_to_be32(args->range.iomode);
2007         *p = cpu_to_be32(RETURN_FILE);
2008         p = reserve_space(xdr, 16);
2009         p = xdr_encode_hyper(p, args->range.offset);
2010         p = xdr_encode_hyper(p, args->range.length);
2011         spin_lock(&args->inode->i_lock);
2012         encode_nfs4_stateid(xdr, &args->stateid);
2013         spin_unlock(&args->inode->i_lock);
2014         if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
2015                 NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
2016                         NFS_I(args->inode)->layout, xdr, args);
2017         } else
2018                 encode_uint32(xdr, 0);
2019 }
2020 
2021 static int
2022 encode_secinfo_no_name(struct xdr_stream *xdr,
2023                        const struct nfs41_secinfo_no_name_args *args,
2024                        struct compound_hdr *hdr)
2025 {
2026         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2027         encode_uint32(xdr, args->style);
2028         return 0;
2029 }
2030 
2031 static void encode_test_stateid(struct xdr_stream *xdr,
2032                                 struct nfs41_test_stateid_args *args,
2033                                 struct compound_hdr *hdr)
2034 {
2035         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2036         encode_uint32(xdr, 1);
2037         encode_nfs4_stateid(xdr, args->stateid);
2038 }
2039 
2040 static void encode_free_stateid(struct xdr_stream *xdr,
2041                                 struct nfs41_free_stateid_args *args,
2042                                 struct compound_hdr *hdr)
2043 {
2044         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2045         encode_nfs4_stateid(xdr, &args->stateid);
2046 }
2047 #endif /* CONFIG_NFS_V4_1 */
2048 
2049 /*
2050  * END OF "GENERIC" ENCODE ROUTINES.
2051  */
2052 
2053 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2054 {
2055 #if defined(CONFIG_NFS_V4_1)
2056         struct nfs4_session *session = args->sa_slot->table->session;
2057         if (session)
2058                 return session->clp->cl_mvops->minor_version;
2059 #endif /* CONFIG_NFS_V4_1 */
2060         return 0;
2061 }
2062 
2063 /*
2064  * Encode an ACCESS request
2065  */
2066 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2067                                 const struct nfs4_accessargs *args)
2068 {
2069         struct compound_hdr hdr = {
2070                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2071         };
2072 
2073         encode_compound_hdr(xdr, req, &hdr);
2074         encode_sequence(xdr, &args->seq_args, &hdr);
2075         encode_putfh(xdr, args->fh, &hdr);
2076         encode_access(xdr, args->access, &hdr);
2077         encode_getfattr(xdr, args->bitmask, &hdr);
2078         encode_nops(&hdr);
2079 }
2080 
2081 /*
2082  * Encode LOOKUP request
2083  */
2084 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2085                                 const struct nfs4_lookup_arg *args)
2086 {
2087         struct compound_hdr hdr = {
2088                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2089         };
2090 
2091         encode_compound_hdr(xdr, req, &hdr);
2092         encode_sequence(xdr, &args->seq_args, &hdr);
2093         encode_putfh(xdr, args->dir_fh, &hdr);
2094         encode_lookup(xdr, args->name, &hdr);
2095         encode_getfh(xdr, &hdr);
2096         encode_getfattr(xdr, args->bitmask, &hdr);
2097         encode_nops(&hdr);
2098 }
2099 
2100 /*
2101  * Encode LOOKUP_ROOT request
2102  */
2103 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2104                                      struct xdr_stream *xdr,
2105                                      const struct nfs4_lookup_root_arg *args)
2106 {
2107         struct compound_hdr hdr = {
2108                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2109         };
2110 
2111         encode_compound_hdr(xdr, req, &hdr);
2112         encode_sequence(xdr, &args->seq_args, &hdr);
2113         encode_putrootfh(xdr, &hdr);
2114         encode_getfh(xdr, &hdr);
2115         encode_getfattr(xdr, args->bitmask, &hdr);
2116         encode_nops(&hdr);
2117 }
2118 
2119 /*
2120  * Encode REMOVE request
2121  */
2122 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2123                                 const struct nfs_removeargs *args)
2124 {
2125         struct compound_hdr hdr = {
2126                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2127         };
2128 
2129         encode_compound_hdr(xdr, req, &hdr);
2130         encode_sequence(xdr, &args->seq_args, &hdr);
2131         encode_putfh(xdr, args->fh, &hdr);
2132         encode_remove(xdr, &args->name, &hdr);
2133         encode_nops(&hdr);
2134 }
2135 
2136 /*
2137  * Encode RENAME request
2138  */
2139 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2140                                 const struct nfs_renameargs *args)
2141 {
2142         struct compound_hdr hdr = {
2143                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2144         };
2145 
2146         encode_compound_hdr(xdr, req, &hdr);
2147         encode_sequence(xdr, &args->seq_args, &hdr);
2148         encode_putfh(xdr, args->old_dir, &hdr);
2149         encode_savefh(xdr, &hdr);
2150         encode_putfh(xdr, args->new_dir, &hdr);
2151         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2152         encode_nops(&hdr);
2153 }
2154 
2155 /*
2156  * Encode LINK request
2157  */
2158 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2159                              const struct nfs4_link_arg *args)
2160 {
2161         struct compound_hdr hdr = {
2162                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2163         };
2164 
2165         encode_compound_hdr(xdr, req, &hdr);
2166         encode_sequence(xdr, &args->seq_args, &hdr);
2167         encode_putfh(xdr, args->fh, &hdr);
2168         encode_savefh(xdr, &hdr);
2169         encode_putfh(xdr, args->dir_fh, &hdr);
2170         encode_link(xdr, args->name, &hdr);
2171         encode_restorefh(xdr, &hdr);
2172         encode_getfattr(xdr, args->bitmask, &hdr);
2173         encode_nops(&hdr);
2174 }
2175 
2176 /*
2177  * Encode CREATE request
2178  */
2179 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2180                                 const struct nfs4_create_arg *args)
2181 {
2182         struct compound_hdr hdr = {
2183                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2184         };
2185 
2186         encode_compound_hdr(xdr, req, &hdr);
2187         encode_sequence(xdr, &args->seq_args, &hdr);
2188         encode_putfh(xdr, args->dir_fh, &hdr);
2189         encode_create(xdr, args, &hdr);
2190         encode_getfh(xdr, &hdr);
2191         encode_getfattr(xdr, args->bitmask, &hdr);
2192         encode_nops(&hdr);
2193 }
2194 
2195 /*
2196  * Encode SYMLINK request
2197  */
2198 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2199                                  const struct nfs4_create_arg *args)
2200 {
2201         nfs4_xdr_enc_create(req, xdr, args);
2202 }
2203 
2204 /*
2205  * Encode GETATTR request
2206  */
2207 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2208                                  const struct nfs4_getattr_arg *args)
2209 {
2210         struct compound_hdr hdr = {
2211                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2212         };
2213 
2214         encode_compound_hdr(xdr, req, &hdr);
2215         encode_sequence(xdr, &args->seq_args, &hdr);
2216         encode_putfh(xdr, args->fh, &hdr);
2217         encode_getfattr(xdr, args->bitmask, &hdr);
2218         encode_nops(&hdr);
2219 }
2220 
2221 /*
2222  * Encode a CLOSE request
2223  */
2224 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2225                                struct nfs_closeargs *args)
2226 {
2227         struct compound_hdr hdr = {
2228                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2229         };
2230 
2231         encode_compound_hdr(xdr, req, &hdr);
2232         encode_sequence(xdr, &args->seq_args, &hdr);
2233         encode_putfh(xdr, args->fh, &hdr);
2234         encode_close(xdr, args, &hdr);
2235         encode_getfattr(xdr, args->bitmask, &hdr);
2236         encode_nops(&hdr);
2237 }
2238 
2239 /*
2240  * Encode an OPEN request
2241  */
2242 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2243                               struct nfs_openargs *args)
2244 {
2245         struct compound_hdr hdr = {
2246                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2247         };
2248 
2249         encode_compound_hdr(xdr, req, &hdr);
2250         encode_sequence(xdr, &args->seq_args, &hdr);
2251         encode_putfh(xdr, args->fh, &hdr);
2252         encode_open(xdr, args, &hdr);
2253         encode_getfh(xdr, &hdr);
2254         if (args->access)
2255                 encode_access(xdr, args->access, &hdr);
2256         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2257         encode_nops(&hdr);
2258 }
2259 
2260 /*
2261  * Encode an OPEN_CONFIRM request
2262  */
2263 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2264                                       struct xdr_stream *xdr,
2265                                       struct nfs_open_confirmargs *args)
2266 {
2267         struct compound_hdr hdr = {
2268                 .nops   = 0,
2269         };
2270 
2271         encode_compound_hdr(xdr, req, &hdr);
2272         encode_putfh(xdr, args->fh, &hdr);
2273         encode_open_confirm(xdr, args, &hdr);
2274         encode_nops(&hdr);
2275 }
2276 
2277 /*
2278  * Encode an OPEN request with no attributes.
2279  */
2280 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2281                                      struct xdr_stream *xdr,
2282                                      struct nfs_openargs *args)
2283 {
2284         struct compound_hdr hdr = {
2285                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2286         };
2287 
2288         encode_compound_hdr(xdr, req, &hdr);
2289         encode_sequence(xdr, &args->seq_args, &hdr);
2290         encode_putfh(xdr, args->fh, &hdr);
2291         encode_open(xdr, args, &hdr);
2292         if (args->access)
2293                 encode_access(xdr, args->access, &hdr);
2294         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2295         encode_nops(&hdr);
2296 }
2297 
2298 /*
2299  * Encode an OPEN_DOWNGRADE request
2300  */
2301 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2302                                         struct xdr_stream *xdr,
2303                                         struct nfs_closeargs *args)
2304 {
2305         struct compound_hdr hdr = {
2306                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2307         };
2308 
2309         encode_compound_hdr(xdr, req, &hdr);
2310         encode_sequence(xdr, &args->seq_args, &hdr);
2311         encode_putfh(xdr, args->fh, &hdr);
2312         encode_open_downgrade(xdr, args, &hdr);
2313         encode_getfattr(xdr, args->bitmask, &hdr);
2314         encode_nops(&hdr);
2315 }
2316 
2317 /*
2318  * Encode a LOCK request
2319  */
2320 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2321                               struct nfs_lock_args *args)
2322 {
2323         struct compound_hdr hdr = {
2324                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2325         };
2326 
2327         encode_compound_hdr(xdr, req, &hdr);
2328         encode_sequence(xdr, &args->seq_args, &hdr);
2329         encode_putfh(xdr, args->fh, &hdr);
2330         encode_lock(xdr, args, &hdr);
2331         encode_nops(&hdr);
2332 }
2333 
2334 /*
2335  * Encode a LOCKT request
2336  */
2337 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2338                                struct nfs_lockt_args *args)
2339 {
2340         struct compound_hdr hdr = {
2341                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2342         };
2343 
2344         encode_compound_hdr(xdr, req, &hdr);
2345         encode_sequence(xdr, &args->seq_args, &hdr);
2346         encode_putfh(xdr, args->fh, &hdr);
2347         encode_lockt(xdr, args, &hdr);
2348         encode_nops(&hdr);
2349 }
2350 
2351 /*
2352  * Encode a LOCKU request
2353  */
2354 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2355                                struct nfs_locku_args *args)
2356 {
2357         struct compound_hdr hdr = {
2358                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2359         };
2360 
2361         encode_compound_hdr(xdr, req, &hdr);
2362         encode_sequence(xdr, &args->seq_args, &hdr);
2363         encode_putfh(xdr, args->fh, &hdr);
2364         encode_locku(xdr, args, &hdr);
2365         encode_nops(&hdr);
2366 }
2367 
2368 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2369                                            struct xdr_stream *xdr,
2370                                         struct nfs_release_lockowner_args *args)
2371 {
2372         struct compound_hdr hdr = {
2373                 .minorversion = 0,
2374         };
2375 
2376         encode_compound_hdr(xdr, req, &hdr);
2377         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2378         encode_nops(&hdr);
2379 }
2380 
2381 /*
2382  * Encode a READLINK request
2383  */
2384 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2385                                   const struct nfs4_readlink *args)
2386 {
2387         struct compound_hdr hdr = {
2388                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2389         };
2390 
2391         encode_compound_hdr(xdr, req, &hdr);
2392         encode_sequence(xdr, &args->seq_args, &hdr);
2393         encode_putfh(xdr, args->fh, &hdr);
2394         encode_readlink(xdr, args, req, &hdr);
2395 
2396         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2397                         args->pgbase, args->pglen);
2398         encode_nops(&hdr);
2399 }
2400 
2401 /*
2402  * Encode a READDIR request
2403  */
2404 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2405                                  const struct nfs4_readdir_arg *args)
2406 {
2407         struct compound_hdr hdr = {
2408                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2409         };
2410 
2411         encode_compound_hdr(xdr, req, &hdr);
2412         encode_sequence(xdr, &args->seq_args, &hdr);
2413         encode_putfh(xdr, args->fh, &hdr);
2414         encode_readdir(xdr, args, req, &hdr);
2415 
2416         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2417                          args->pgbase, args->count);
2418         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2419                         __func__, hdr.replen << 2, args->pages,
2420                         args->pgbase, args->count);
2421         encode_nops(&hdr);
2422 }
2423 
2424 /*
2425  * Encode a READ request
2426  */
2427 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2428                               struct nfs_pgio_args *args)
2429 {
2430         struct compound_hdr hdr = {
2431                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2432         };
2433 
2434         encode_compound_hdr(xdr, req, &hdr);
2435         encode_sequence(xdr, &args->seq_args, &hdr);
2436         encode_putfh(xdr, args->fh, &hdr);
2437         encode_read(xdr, args, &hdr);
2438 
2439         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2440                          args->pages, args->pgbase, args->count);
2441         req->rq_rcv_buf.flags |= XDRBUF_READ;
2442         encode_nops(&hdr);
2443 }
2444 
2445 /*
2446  * Encode an SETATTR request
2447  */
2448 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2449                                  struct nfs_setattrargs *args)
2450 {
2451         struct compound_hdr hdr = {
2452                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2453         };
2454 
2455         encode_compound_hdr(xdr, req, &hdr);
2456         encode_sequence(xdr, &args->seq_args, &hdr);
2457         encode_putfh(xdr, args->fh, &hdr);
2458         encode_setattr(xdr, args, args->server, &hdr);
2459         encode_getfattr(xdr, args->bitmask, &hdr);
2460         encode_nops(&hdr);
2461 }
2462 
2463 /*
2464  * Encode a GETACL request
2465  */
2466 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2467                                 struct nfs_getaclargs *args)
2468 {
2469         struct compound_hdr hdr = {
2470                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2471         };
2472         uint32_t replen;
2473 
2474         encode_compound_hdr(xdr, req, &hdr);
2475         encode_sequence(xdr, &args->seq_args, &hdr);
2476         encode_putfh(xdr, args->fh, &hdr);
2477         replen = hdr.replen + op_decode_hdr_maxsz + 1;
2478         encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
2479 
2480         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2481                 args->acl_pages, args->acl_pgbase, args->acl_len);
2482 
2483         encode_nops(&hdr);
2484 }
2485 
2486 /*
2487  * Encode a WRITE request
2488  */
2489 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2490                                struct nfs_pgio_args *args)
2491 {
2492         struct compound_hdr hdr = {
2493                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2494         };
2495 
2496         encode_compound_hdr(xdr, req, &hdr);
2497         encode_sequence(xdr, &args->seq_args, &hdr);
2498         encode_putfh(xdr, args->fh, &hdr);
2499         encode_write(xdr, args, &hdr);
2500         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2501         if (args->bitmask)
2502                 encode_getfattr(xdr, args->bitmask, &hdr);
2503         encode_nops(&hdr);
2504 }
2505 
2506 /*
2507  *  a COMMIT request
2508  */
2509 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2510                                 struct nfs_commitargs *args)
2511 {
2512         struct compound_hdr hdr = {
2513                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2514         };
2515 
2516         encode_compound_hdr(xdr, req, &hdr);
2517         encode_sequence(xdr, &args->seq_args, &hdr);
2518         encode_putfh(xdr, args->fh, &hdr);
2519         encode_commit(xdr, args, &hdr);
2520         encode_nops(&hdr);
2521 }
2522 
2523 /*
2524  * FSINFO request
2525  */
2526 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2527                                 struct nfs4_fsinfo_arg *args)
2528 {
2529         struct compound_hdr hdr = {
2530                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2531         };
2532 
2533         encode_compound_hdr(xdr, req, &hdr);
2534         encode_sequence(xdr, &args->seq_args, &hdr);
2535         encode_putfh(xdr, args->fh, &hdr);
2536         encode_fsinfo(xdr, args->bitmask, &hdr);
2537         encode_nops(&hdr);
2538 }
2539 
2540 /*
2541  * a PATHCONF request
2542  */
2543 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2544                                   const struct nfs4_pathconf_arg *args)
2545 {
2546         struct compound_hdr hdr = {
2547                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2548         };
2549 
2550         encode_compound_hdr(xdr, req, &hdr);
2551         encode_sequence(xdr, &args->seq_args, &hdr);
2552         encode_putfh(xdr, args->fh, &hdr);
2553         encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2554                            &hdr);
2555         encode_nops(&hdr);
2556 }
2557 
2558 /*
2559  * a STATFS request
2560  */
2561 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2562                                 const struct nfs4_statfs_arg *args)
2563 {
2564         struct compound_hdr hdr = {
2565                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2566         };
2567 
2568         encode_compound_hdr(xdr, req, &hdr);
2569         encode_sequence(xdr, &args->seq_args, &hdr);
2570         encode_putfh(xdr, args->fh, &hdr);
2571         encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2572                            args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2573         encode_nops(&hdr);
2574 }
2575 
2576 /*
2577  * GETATTR_BITMAP request
2578  */
2579 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2580                                      struct xdr_stream *xdr,
2581                                      struct nfs4_server_caps_arg *args)
2582 {
2583         struct compound_hdr hdr = {
2584                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2585         };
2586 
2587         encode_compound_hdr(xdr, req, &hdr);
2588         encode_sequence(xdr, &args->seq_args, &hdr);
2589         encode_putfh(xdr, args->fhandle, &hdr);
2590         encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2591                            FATTR4_WORD0_FH_EXPIRE_TYPE|
2592                            FATTR4_WORD0_LINK_SUPPORT|
2593                            FATTR4_WORD0_SYMLINK_SUPPORT|
2594                            FATTR4_WORD0_ACLSUPPORT, &hdr);
2595         encode_nops(&hdr);
2596 }
2597 
2598 /*
2599  * a RENEW request
2600  */
2601 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2602                                struct nfs_client *clp)
2603 {
2604         struct compound_hdr hdr = {
2605                 .nops   = 0,
2606         };
2607 
2608         encode_compound_hdr(xdr, req, &hdr);
2609         encode_renew(xdr, clp->cl_clientid, &hdr);
2610         encode_nops(&hdr);
2611 }
2612 
2613 /*
2614  * a SETCLIENTID request
2615  */
2616 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2617                                      struct xdr_stream *xdr,
2618                                      struct nfs4_setclientid *sc)
2619 {
2620         struct compound_hdr hdr = {
2621                 .nops   = 0,
2622         };
2623 
2624         encode_compound_hdr(xdr, req, &hdr);
2625         encode_setclientid(xdr, sc, &hdr);
2626         encode_nops(&hdr);
2627 }
2628 
2629 /*
2630  * a SETCLIENTID_CONFIRM request
2631  */
2632 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2633                                              struct xdr_stream *xdr,
2634                                              struct nfs4_setclientid_res *arg)
2635 {
2636         struct compound_hdr hdr = {
2637                 .nops   = 0,
2638         };
2639 
2640         encode_compound_hdr(xdr, req, &hdr);
2641         encode_setclientid_confirm(xdr, arg, &hdr);
2642         encode_nops(&hdr);
2643 }
2644 
2645 /*
2646  * DELEGRETURN request
2647  */
2648 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2649                                      struct xdr_stream *xdr,
2650                                      const struct nfs4_delegreturnargs *args)
2651 {
2652         struct compound_hdr hdr = {
2653                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2654         };
2655 
2656         encode_compound_hdr(xdr, req, &hdr);
2657         encode_sequence(xdr, &args->seq_args, &hdr);
2658         encode_putfh(xdr, args->fhandle, &hdr);
2659         encode_getfattr(xdr, args->bitmask, &hdr);
2660         encode_delegreturn(xdr, args->stateid, &hdr);
2661         encode_nops(&hdr);
2662 }
2663 
2664 /*
2665  * Encode FS_LOCATIONS request
2666  */
2667 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2668                                       struct xdr_stream *xdr,
2669                                       struct nfs4_fs_locations_arg *args)
2670 {
2671         struct compound_hdr hdr = {
2672                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2673         };
2674         uint32_t replen;
2675 
2676         encode_compound_hdr(xdr, req, &hdr);
2677         encode_sequence(xdr, &args->seq_args, &hdr);
2678         if (args->migration) {
2679                 encode_putfh(xdr, args->fh, &hdr);
2680                 replen = hdr.replen;
2681                 encode_fs_locations(xdr, args->bitmask, &hdr);
2682                 if (args->renew)
2683                         encode_renew(xdr, args->clientid, &hdr);
2684         } else {
2685                 encode_putfh(xdr, args->dir_fh, &hdr);
2686                 encode_lookup(xdr, args->name, &hdr);
2687                 replen = hdr.replen;
2688                 encode_fs_locations(xdr, args->bitmask, &hdr);
2689         }
2690 
2691         /* Set up reply kvec to capture returned fs_locations array. */
2692         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2693                         0, PAGE_SIZE);
2694         encode_nops(&hdr);
2695 }
2696 
2697 /*
2698  * Encode SECINFO request
2699  */
2700 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2701                                 struct xdr_stream *xdr,
2702                                 struct nfs4_secinfo_arg *args)
2703 {
2704         struct compound_hdr hdr = {
2705                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2706         };
2707 
2708         encode_compound_hdr(xdr, req, &hdr);
2709         encode_sequence(xdr, &args->seq_args, &hdr);
2710         encode_putfh(xdr, args->dir_fh, &hdr);
2711         encode_secinfo(xdr, args->name, &hdr);
2712         encode_nops(&hdr);
2713 }
2714 
2715 /*
2716  * Encode FSID_PRESENT request
2717  */
2718 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2719                                       struct xdr_stream *xdr,
2720                                       struct nfs4_fsid_present_arg *args)
2721 {
2722         struct compound_hdr hdr = {
2723                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2724         };
2725 
2726         encode_compound_hdr(xdr, req, &hdr);
2727         encode_sequence(xdr, &args->seq_args, &hdr);
2728         encode_putfh(xdr, args->fh, &hdr);
2729         encode_getfh(xdr, &hdr);
2730         if (args->renew)
2731                 encode_renew(xdr, args->clientid, &hdr);
2732         encode_nops(&hdr);
2733 }
2734 
2735 #if defined(CONFIG_NFS_V4_1)
2736 /*
2737  * BIND_CONN_TO_SESSION request
2738  */
2739 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2740                                 struct xdr_stream *xdr,
2741                                 struct nfs41_bind_conn_to_session_args *args)
2742 {
2743         struct compound_hdr hdr = {
2744                 .minorversion = args->client->cl_mvops->minor_version,
2745         };
2746 
2747         encode_compound_hdr(xdr, req, &hdr);
2748         encode_bind_conn_to_session(xdr, args, &hdr);
2749         encode_nops(&hdr);
2750 }
2751 
2752 /*
2753  * EXCHANGE_ID request
2754  */
2755 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2756                                      struct xdr_stream *xdr,
2757                                      struct nfs41_exchange_id_args *args)
2758 {
2759         struct compound_hdr hdr = {
2760                 .minorversion = args->client->cl_mvops->minor_version,
2761         };
2762 
2763         encode_compound_hdr(xdr, req, &hdr);
2764         encode_exchange_id(xdr, args, &hdr);
2765         encode_nops(&hdr);
2766 }
2767 
2768 /*
2769  * a CREATE_SESSION request
2770  */
2771 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2772                                         struct xdr_stream *xdr,
2773                                         struct nfs41_create_session_args *args)
2774 {
2775         struct compound_hdr hdr = {
2776                 .minorversion = args->client->cl_mvops->minor_version,
2777         };
2778 
2779         encode_compound_hdr(xdr, req, &hdr);
2780         encode_create_session(xdr, args, &hdr);
2781         encode_nops(&hdr);
2782 }
2783 
2784 /*
2785  * a DESTROY_SESSION request
2786  */
2787 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2788                                          struct xdr_stream *xdr,
2789                                          struct nfs4_session *session)
2790 {
2791         struct compound_hdr hdr = {
2792                 .minorversion = session->clp->cl_mvops->minor_version,
2793         };
2794 
2795         encode_compound_hdr(xdr, req, &hdr);
2796         encode_destroy_session(xdr, session, &hdr);
2797         encode_nops(&hdr);
2798 }
2799 
2800 /*
2801  * a DESTROY_CLIENTID request
2802  */
2803 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2804                                          struct xdr_stream *xdr,
2805                                          struct nfs_client *clp)
2806 {
2807         struct compound_hdr hdr = {
2808                 .minorversion = clp->cl_mvops->minor_version,
2809         };
2810 
2811         encode_compound_hdr(xdr, req, &hdr);
2812         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2813         encode_nops(&hdr);
2814 }
2815 
2816 /*
2817  * a SEQUENCE request
2818  */
2819 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2820                                   struct nfs4_sequence_args *args)
2821 {
2822         struct compound_hdr hdr = {
2823                 .minorversion = nfs4_xdr_minorversion(args),
2824         };
2825 
2826         encode_compound_hdr(xdr, req, &hdr);
2827         encode_sequence(xdr, args, &hdr);
2828         encode_nops(&hdr);
2829 }
2830 
2831 /*
2832  * a GET_LEASE_TIME request
2833  */
2834 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2835                                         struct xdr_stream *xdr,
2836                                         struct nfs4_get_lease_time_args *args)
2837 {
2838         struct compound_hdr hdr = {
2839                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2840         };
2841         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2842 
2843         encode_compound_hdr(xdr, req, &hdr);
2844         encode_sequence(xdr, &args->la_seq_args, &hdr);
2845         encode_putrootfh(xdr, &hdr);
2846         encode_fsinfo(xdr, lease_bitmap, &hdr);
2847         encode_nops(&hdr);
2848 }
2849 
2850 /*
2851  * a RECLAIM_COMPLETE request
2852  */
2853 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2854                                           struct xdr_stream *xdr,
2855                                 struct nfs41_reclaim_complete_args *args)
2856 {
2857         struct compound_hdr hdr = {
2858                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2859         };
2860 
2861         encode_compound_hdr(xdr, req, &hdr);
2862         encode_sequence(xdr, &args->seq_args, &hdr);
2863         encode_reclaim_complete(xdr, args, &hdr);
2864         encode_nops(&hdr);
2865 }
2866 
2867 /*
2868  * Encode GETDEVICEINFO request
2869  */
2870 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
2871                                        struct xdr_stream *xdr,
2872                                        struct nfs4_getdeviceinfo_args *args)
2873 {
2874         struct compound_hdr hdr = {
2875                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2876         };
2877 
2878         encode_compound_hdr(xdr, req, &hdr);
2879         encode_sequence(xdr, &args->seq_args, &hdr);
2880         encode_getdeviceinfo(xdr, args, &hdr);
2881 
2882         /* set up reply kvec. Subtract notification bitmap max size (2)
2883          * so that notification bitmap is put in xdr_buf tail */
2884         xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
2885                          args->pdev->pages, args->pdev->pgbase,
2886                          args->pdev->pglen);
2887 
2888         encode_nops(&hdr);
2889 }
2890 
2891 /*
2892  *  Encode LAYOUTGET request
2893  */
2894 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
2895                                    struct xdr_stream *xdr,
2896                                    struct nfs4_layoutget_args *args)
2897 {
2898         struct compound_hdr hdr = {
2899                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2900         };
2901 
2902         encode_compound_hdr(xdr, req, &hdr);
2903         encode_sequence(xdr, &args->seq_args, &hdr);
2904         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2905         encode_layoutget(xdr, args, &hdr);
2906 
2907         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2908             args->layout.pages, 0, args->layout.pglen);
2909 
2910         encode_nops(&hdr);
2911 }
2912 
2913 /*
2914  *  Encode LAYOUTCOMMIT request
2915  */
2916 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
2917                                       struct xdr_stream *xdr,
2918                                       struct nfs4_layoutcommit_args *args)
2919 {
2920         struct nfs4_layoutcommit_data *data =
2921                 container_of(args, struct nfs4_layoutcommit_data, args);
2922         struct compound_hdr hdr = {
2923                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2924         };
2925 
2926         encode_compound_hdr(xdr, req, &hdr);
2927         encode_sequence(xdr, &args->seq_args, &hdr);
2928         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2929         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
2930         encode_getfattr(xdr, args->bitmask, &hdr);
2931         encode_nops(&hdr);
2932 }
2933 
2934 /*
2935  * Encode LAYOUTRETURN request
2936  */
2937 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
2938                                       struct xdr_stream *xdr,
2939                                       struct nfs4_layoutreturn_args *args)
2940 {
2941         struct compound_hdr hdr = {
2942                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2943         };
2944 
2945         encode_compound_hdr(xdr, req, &hdr);
2946         encode_sequence(xdr, &args->seq_args, &hdr);
2947         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2948         encode_layoutreturn(xdr, args, &hdr);
2949         encode_nops(&hdr);
2950 }
2951 
2952 /*
2953  * Encode SECINFO_NO_NAME request
2954  */
2955 static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
2956                                         struct xdr_stream *xdr,
2957                                         struct nfs41_secinfo_no_name_args *args)
2958 {
2959         struct compound_hdr hdr = {
2960                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2961         };
2962 
2963         encode_compound_hdr(xdr, req, &hdr);
2964         encode_sequence(xdr, &args->seq_args, &hdr);
2965         encode_putrootfh(xdr, &hdr);
2966         encode_secinfo_no_name(xdr, args, &hdr);
2967         encode_nops(&hdr);
2968         return 0;
2969 }
2970 
2971 /*
2972  *  Encode TEST_STATEID request
2973  */
2974 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
2975                                       struct xdr_stream *xdr,
2976                                       struct nfs41_test_stateid_args *args)
2977 {
2978         struct compound_hdr hdr = {
2979                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2980         };
2981 
2982         encode_compound_hdr(xdr, req, &hdr);
2983         encode_sequence(xdr, &args->seq_args, &hdr);
2984         encode_test_stateid(xdr, args, &hdr);
2985         encode_nops(&hdr);
2986 }
2987 
2988 /*
2989  *  Encode FREE_STATEID request
2990  */
2991 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
2992                                      struct xdr_stream *xdr,
2993                                      struct nfs41_free_stateid_args *args)
2994 {
2995         struct compound_hdr hdr = {
2996                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2997         };
2998 
2999         encode_compound_hdr(xdr, req, &hdr);
3000         encode_sequence(xdr, &args->seq_args, &hdr);
3001         encode_free_stateid(xdr, args, &hdr);
3002         encode_nops(&hdr);
3003 }
3004 #endif /* CONFIG_NFS_V4_1 */
3005 
3006 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
3007 {
3008         dprintk("nfs: %s: prematurely hit end of receive buffer. "
3009                 "Remaining buffer length is %tu words.\n",
3010                 func, xdr->end - xdr->p);
3011 }
3012 
3013 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3014 {
3015         __be32 *p;
3016 
3017         p = xdr_inline_decode(xdr, 4);
3018         if (unlikely(!p))
3019                 goto out_overflow;
3020         *len = be32_to_cpup(p);
3021         p = xdr_inline_decode(xdr, *len);
3022         if (unlikely(!p))
3023                 goto out_overflow;
3024         *string = (char *)p;
3025         return 0;
3026 out_overflow:
3027         print_overflow_msg(__func__, xdr);
3028         return -EIO;
3029 }
3030 
3031 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3032 {
3033         __be32 *p;
3034 
3035         p = xdr_inline_decode(xdr, 8);
3036         if (unlikely(!p))
3037                 goto out_overflow;
3038         hdr->status = be32_to_cpup(p++);
3039         hdr->taglen = be32_to_cpup(p);
3040 
3041         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3042         if (unlikely(!p))
3043                 goto out_overflow;
3044         hdr->tag = (char *)p;
3045         p += XDR_QUADLEN(hdr->taglen);
3046         hdr->nops = be32_to_cpup(p);
3047         if (unlikely(hdr->nops < 1))
3048                 return nfs4_stat_to_errno(hdr->status);
3049         return 0;
3050 out_overflow:
3051         print_overflow_msg(__func__, xdr);
3052         return -EIO;
3053 }
3054 
3055 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3056                 int *nfs_retval)
3057 {
3058         __be32 *p;
3059         uint32_t opnum;
3060         int32_t nfserr;
3061 
3062         p = xdr_inline_decode(xdr, 8);
3063         if (unlikely(!p))
3064                 goto out_overflow;
3065         opnum = be32_to_cpup(p++);
3066         if (unlikely(opnum != expected))
3067                 goto out_bad_operation;
3068         nfserr = be32_to_cpup(p);
3069         if (nfserr == NFS_OK)
3070                 *nfs_retval = 0;
3071         else
3072                 *nfs_retval = nfs4_stat_to_errno(nfserr);
3073         return true;
3074 out_bad_operation:
3075         dprintk("nfs: Server returned operation"
3076                 " %d but we issued a request for %d\n",
3077                         opnum, expected);
3078         *nfs_retval = -EREMOTEIO;
3079         return false;
3080 out_overflow:
3081         print_overflow_msg(__func__, xdr);
3082         *nfs_retval = -EIO;
3083         return false;
3084 }
3085 
3086 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3087 {
3088         int retval;
3089 
3090         __decode_op_hdr(xdr, expected, &retval);
3091         return retval;
3092 }
3093 
3094 /* Dummy routine */
3095 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
3096 {
3097         __be32 *p;
3098         unsigned int strlen;
3099         char *str;
3100 
3101         p = xdr_inline_decode(xdr, 12);
3102         if (likely(p))
3103                 return decode_opaque_inline(xdr, &strlen, &str);
3104         print_overflow_msg(__func__, xdr);
3105         return -EIO;
3106 }
3107 
3108 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3109 {
3110         uint32_t bmlen;
3111         __be32 *p;
3112 
3113         p = xdr_inline_decode(xdr, 4);
3114         if (unlikely(!p))
3115                 goto out_overflow;
3116         bmlen = be32_to_cpup(p);
3117 
3118         bitmap[0] = bitmap[1] = bitmap[2] = 0;
3119         p = xdr_inline_decode(xdr, (bmlen << 2));
3120         if (unlikely(!p))
3121                 goto out_overflow;
3122         if (bmlen > 0) {
3123                 bitmap[0] = be32_to_cpup(p++);
3124                 if (bmlen > 1) {
3125                         bitmap[1] = be32_to_cpup(p++);
3126                         if (bmlen > 2)
3127                                 bitmap[2] = be32_to_cpup(p);
3128                 }
3129         }
3130         return 0;
3131 out_overflow:
3132         print_overflow_msg(__func__, xdr);
3133         return -EIO;
3134 }
3135 
3136 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3137 {
3138         __be32 *p;
3139 
3140         p = xdr_inline_decode(xdr, 4);
3141         if (unlikely(!p))
3142                 goto out_overflow;
3143         *attrlen = be32_to_cpup(p);
3144         *savep = xdr_stream_pos(xdr);
3145         return 0;
3146 out_overflow:
3147         print_overflow_msg(__func__, xdr);
3148         return -EIO;
3149 }
3150 
3151 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3152 {
3153         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3154                 int ret;
3155                 ret = decode_attr_bitmap(xdr, bitmask);
3156                 if (unlikely(ret < 0))
3157                         return ret;
3158                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3159         } else
3160                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3161         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3162                 bitmask[0], bitmask[1], bitmask[2]);
3163         return 0;
3164 }
3165 
3166 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3167 {
3168         __be32 *p;
3169         int ret = 0;
3170 
3171         *type = 0;
3172         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3173                 return -EIO;
3174         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3175                 p = xdr_inline_decode(xdr, 4);
3176                 if (unlikely(!p))
3177                         goto out_overflow;
3178                 *type = be32_to_cpup(p);
3179                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3180                         dprintk("%s: bad type %d\n", __func__, *type);
3181                         return -EIO;
3182                 }
3183                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3184                 ret = NFS_ATTR_FATTR_TYPE;
3185         }
3186         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3187         return ret;
3188 out_overflow:
3189         print_overflow_msg(__func__, xdr);
3190         return -EIO;
3191 }
3192 
3193 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3194                                       uint32_t *bitmap, uint32_t *type)
3195 {
3196         __be32 *p;
3197 
3198         *type = 0;
3199         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3200                 return -EIO;
3201         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3202                 p = xdr_inline_decode(xdr, 4);
3203                 if (unlikely(!p))
3204                         goto out_overflow;
3205                 *type = be32_to_cpup(p);
3206                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3207         }
3208         dprintk("%s: expire type=0x%x\n", __func__, *type);
3209         return 0;
3210 out_overflow:
3211         print_overflow_msg(__func__, xdr);
3212         return -EIO;
3213 }
3214 
3215 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3216 {
3217         __be32 *p;
3218         int ret = 0;
3219 
3220         *change = 0;
3221         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3222                 return -EIO;
3223         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3224                 p = xdr_inline_decode(xdr, 8);
3225                 if (unlikely(!p))
3226                         goto out_overflow;
3227                 xdr_decode_hyper(p, change);
3228                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3229                 ret = NFS_ATTR_FATTR_CHANGE;
3230         }
3231         dprintk("%s: change attribute=%Lu\n", __func__,
3232                         (unsigned long long)*change);
3233         return ret;
3234 out_overflow:
3235         print_overflow_msg(__func__, xdr);
3236         return -EIO;
3237 }
3238 
3239 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3240 {
3241         __be32 *p;
3242         int ret = 0;
3243 
3244         *size = 0;
3245         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3246                 return -EIO;
3247         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3248                 p = xdr_inline_decode(xdr, 8);
3249                 if (unlikely(!p))
3250                         goto out_overflow;
3251                 xdr_decode_hyper(p, size);
3252                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3253                 ret = NFS_ATTR_FATTR_SIZE;
3254         }
3255         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3256         return ret;
3257 out_overflow:
3258         print_overflow_msg(__func__, xdr);
3259         return -EIO;
3260 }
3261 
3262 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3263 {
3264         __be32 *p;
3265 
3266         *res = 0;
3267         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3268                 return -EIO;
3269         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3270                 p = xdr_inline_decode(xdr, 4);
3271                 if (unlikely(!p))
3272                         goto out_overflow;
3273                 *res = be32_to_cpup(p);
3274                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3275         }
3276         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3277         return 0;
3278 out_overflow:
3279         print_overflow_msg(__func__, xdr);
3280         return -EIO;
3281 }
3282 
3283 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3284 {
3285         __be32 *p;
3286 
3287         *res = 0;
3288         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3289                 return -EIO;
3290         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3291                 p = xdr_inline_decode(xdr, 4);
3292                 if (unlikely(!p))
3293                         goto out_overflow;
3294                 *res = be32_to_cpup(p);
3295                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3296         }
3297         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3298         return 0;
3299 out_overflow:
3300         print_overflow_msg(__func__, xdr);
3301         return -EIO;
3302 }
3303 
3304 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3305 {
3306         __be32 *p;
3307         int ret = 0;
3308 
3309         fsid->major = 0;
3310         fsid->minor = 0;
3311         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3312                 return -EIO;
3313         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3314                 p = xdr_inline_decode(xdr, 16);
3315                 if (unlikely(!p))
3316                         goto out_overflow;
3317                 p = xdr_decode_hyper(p, &fsid->major);
3318                 xdr_decode_hyper(p, &fsid->minor);
3319                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3320                 ret = NFS_ATTR_FATTR_FSID;
3321         }
3322         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3323                         (unsigned long long)fsid->major,
3324                         (unsigned long long)fsid->minor);
3325         return ret;
3326 out_overflow:
3327         print_overflow_msg(__func__, xdr);
3328         return -EIO;
3329 }
3330 
3331 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3332 {
3333         __be32 *p;
3334 
3335         *res = 60;
3336         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3337                 return -EIO;
3338         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3339                 p = xdr_inline_decode(xdr, 4);
3340                 if (unlikely(!p))
3341                         goto out_overflow;
3342                 *res = be32_to_cpup(p);
3343                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3344         }
3345         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3346         return 0;
3347 out_overflow:
3348         print_overflow_msg(__func__, xdr);
3349         return -EIO;
3350 }
3351 
3352 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3353 {
3354         __be32 *p;
3355 
3356         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3357                 return -EIO;
3358         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3359                 p = xdr_inline_decode(xdr, 4);
3360                 if (unlikely(!p))
3361                         goto out_overflow;
3362                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3363                 *res = -be32_to_cpup(p);
3364         }
3365         return 0;
3366 out_overflow:
3367         print_overflow_msg(__func__, xdr);
3368         return -EIO;
3369 }
3370 
3371 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3372 {
3373         __be32 *p;
3374         int len;
3375 
3376         if (fh != NULL)
3377                 memset(fh, 0, sizeof(*fh));
3378 
3379         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3380                 return -EIO;
3381         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3382                 p = xdr_inline_decode(xdr, 4);
3383                 if (unlikely(!p))
3384                         goto out_overflow;
3385                 len = be32_to_cpup(p);
3386                 if (len > NFS4_FHSIZE)
3387                         return -EIO;
3388                 p = xdr_inline_decode(xdr, len);
3389                 if (unlikely(!p))
3390                         goto out_overflow;
3391                 if (fh != NULL) {
3392                         memcpy(fh->data, p, len);
3393                         fh->size = len;
3394                 }
3395                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3396         }
3397         return 0;
3398 out_overflow:
3399         print_overflow_msg(__func__, xdr);
3400         return -EIO;
3401 }
3402 
3403 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3404 {
3405         __be32 *p;
3406 
3407         *res = 0;
3408         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3409                 return -EIO;
3410         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3411                 p = xdr_inline_decode(xdr, 4);
3412                 if (unlikely(!p))
3413                         goto out_overflow;
3414                 *res = be32_to_cpup(p);
3415                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3416         }
3417         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3418         return 0;
3419 out_overflow:
3420         print_overflow_msg(__func__, xdr);
3421         return -EIO;
3422 }
3423 
3424 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3425 {
3426         __be32 *p;
3427         int ret = 0;
3428 
3429         *fileid = 0;
3430         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3431                 return -EIO;
3432         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3433                 p = xdr_inline_decode(xdr, 8);
3434                 if (unlikely(!p))
3435                         goto out_overflow;
3436                 xdr_decode_hyper(p, fileid);
3437                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3438                 ret = NFS_ATTR_FATTR_FILEID;
3439         }
3440         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3441         return ret;
3442 out_overflow:
3443         print_overflow_msg(__func__, xdr);
3444         return -EIO;
3445 }
3446 
3447 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3448 {
3449         __be32 *p;
3450         int ret = 0;
3451 
3452         *fileid = 0;
3453         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3454                 return -EIO;
3455         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3456                 p = xdr_inline_decode(xdr, 8);
3457                 if (unlikely(!p))
3458                         goto out_overflow;
3459                 xdr_decode_hyper(p, fileid);
3460                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3461                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3462         }
3463         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3464         return ret;
3465 out_overflow:
3466         print_overflow_msg(__func__, xdr);
3467         return -EIO;
3468 }
3469 
3470 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3471 {
3472         __be32 *p;
3473         int status = 0;
3474 
3475         *res = 0;
3476         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3477                 return -EIO;
3478         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3479                 p = xdr_inline_decode(xdr, 8);
3480                 if (unlikely(!p))
3481                         goto out_overflow;
3482                 xdr_decode_hyper(p, res);
3483                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3484         }
3485         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3486         return status;
3487 out_overflow:
3488         print_overflow_msg(__func__, xdr);
3489         return -EIO;
3490 }
3491 
3492 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3493 {
3494         __be32 *p;
3495         int status = 0;
3496 
3497         *res = 0;
3498         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3499                 return -EIO;
3500         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3501                 p = xdr_inline_decode(xdr, 8);
3502                 if (unlikely(!p))
3503                         goto out_overflow;
3504                 xdr_decode_hyper(p, res);
3505                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3506         }
3507         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3508         return status;
3509 out_overflow:
3510         print_overflow_msg(__func__, xdr);
3511         return -EIO;
3512 }
3513 
3514 static int decode_attr_files_total(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_TOTAL - 1U)))
3521                 return -EIO;
3522         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
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_TOTAL;
3528         }
3529         dprintk("%s: files total=%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_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3537 {
3538         u32 n;
3539         __be32 *p;
3540         int status = 0;
3541 
3542         p = xdr_inline_decode(xdr, 4);
3543         if (unlikely(!p))
3544                 goto out_overflow;
3545         n = be32_to_cpup(p);
3546         if (n == 0)
3547                 goto root_path;
3548         dprintk("pathname4: ");
3549         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3550                 dprintk("cannot parse %d components in path\n", n);
3551                 goto out_eio;
3552         }
3553         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3554                 struct nfs4_string *component = &path->components[path->ncomponents];
3555                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3556                 if (unlikely(status != 0))
3557                         goto out_eio;
3558                 ifdebug (XDR)
3559                         pr_cont("%s%.*s ",
3560                                 (path->ncomponents != n ? "/ " : ""),
3561                                 component->len, component->data);
3562         }
3563 out:
3564         return status;
3565 root_path:
3566 /* a root pathname is sent as a zero component4 */
3567         path->ncomponents = 1;
3568         path->components[0].len=0;
3569         path->components[0].data=NULL;
3570         dprintk("pathname4: /\n");
3571         goto out;
3572 out_eio:
3573         dprintk(" status %d", status);
3574         status = -EIO;
3575         goto out;
3576 out_overflow:
3577         print_overflow_msg(__func__, xdr);
3578         return -EIO;
3579 }
3580 
3581 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3582 {
3583         int n;
3584         __be32 *p;
3585         int status = -EIO;
3586 
3587         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3588                 goto out;
3589         status = 0;
3590         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3591                 goto out;
3592         status = -EIO;
3593         /* Ignore borken servers that return unrequested attrs */
3594         if (unlikely(res == NULL))
3595                 goto out;
3596         dprintk("%s: fsroot:\n", __func__);
3597         status = decode_pathname(xdr, &res->fs_path);
3598         if (unlikely(status != 0))
3599                 goto out;
3600         p = xdr_inline_decode(xdr, 4);
3601         if (unlikely(!p))
3602                 goto out_overflow;
3603         n = be32_to_cpup(p);
3604         if (n <= 0)
3605                 goto out_eio;
3606         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3607                 u32 m;
3608                 struct nfs4_fs_location *loc;
3609 
3610                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3611                         break;
3612                 loc = &res->locations[res->nlocations];
3613                 p = xdr_inline_decode(xdr, 4);
3614                 if (unlikely(!p))
3615                         goto out_overflow;
3616                 m = be32_to_cpup(p);
3617 
3618                 dprintk("%s: servers:\n", __func__);
3619                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3620                         struct nfs4_string *server;
3621 
3622                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3623                                 unsigned int i;
3624                                 dprintk("%s: using first %u of %u servers "
3625                                         "returned for location %u\n",
3626                                                 __func__,
3627                                                 NFS4_FS_LOCATION_MAXSERVERS,
3628                                                 m, res->nlocations);
3629                                 for (i = loc->nservers; i < m; i++) {
3630                                         unsigned int len;
3631                                         char *data;
3632                                         status = decode_opaque_inline(xdr, &len, &data);
3633                                         if (unlikely(status != 0))
3634                                                 goto out_eio;
3635                                 }
3636                                 break;
3637                         }
3638                         server = &loc->servers[loc->nservers];
3639                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3640                         if (unlikely(status != 0))
3641                                 goto out_eio;
3642                         dprintk("%s ", server->data);
3643                 }
3644                 status = decode_pathname(xdr, &loc->rootpath);
3645                 if (unlikely(status != 0))
3646                         goto out_eio;
3647         }
3648         if (res->nlocations != 0)
3649                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3650 out:
3651         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3652         return status;
3653 out_overflow:
3654         print_overflow_msg(__func__, xdr);
3655 out_eio:
3656         status = -EIO;
3657         goto out;
3658 }
3659 
3660 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3661 {
3662         __be32 *p;
3663         int status = 0;
3664 
3665         *res = 0;
3666         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3667                 return -EIO;
3668         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3669                 p = xdr_inline_decode(xdr, 8);
3670                 if (unlikely(!p))
3671                         goto out_overflow;
3672                 xdr_decode_hyper(p, res);
3673                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3674         }
3675         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3676         return status;
3677 out_overflow:
3678         print_overflow_msg(__func__, xdr);
3679         return -EIO;
3680 }
3681 
3682 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3683 {
3684         __be32 *p;
3685         int status = 0;
3686 
3687         *maxlink = 1;
3688         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3689                 return -EIO;
3690         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3691                 p = xdr_inline_decode(xdr, 4);
3692                 if (unlikely(!p))
3693                         goto out_overflow;
3694                 *maxlink = be32_to_cpup(p);
3695                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3696         }
3697         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3698         return status;
3699 out_overflow:
3700         print_overflow_msg(__func__, xdr);
3701         return -EIO;
3702 }
3703 
3704 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3705 {
3706         __be32 *p;
3707         int status = 0;
3708 
3709         *maxname = 1024;
3710         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3711                 return -EIO;
3712         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3713                 p = xdr_inline_decode(xdr, 4);
3714                 if (unlikely(!p))
3715                         goto out_overflow;
3716                 *maxname = be32_to_cpup(p);
3717                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3718         }
3719         dprintk("%s: maxname=%u\n", __func__, *maxname);
3720         return status;
3721 out_overflow:
3722         print_overflow_msg(__func__, xdr);
3723         return -EIO;
3724 }
3725 
3726 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3727 {
3728         __be32 *p;
3729         int status = 0;
3730 
3731         *res = 1024;
3732         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3733                 return -EIO;
3734         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3735                 uint64_t maxread;
3736                 p = xdr_inline_decode(xdr, 8);
3737                 if (unlikely(!p))
3738                         goto out_overflow;
3739                 xdr_decode_hyper(p, &maxread);
3740                 if (maxread > 0x7FFFFFFF)
3741                         maxread = 0x7FFFFFFF;
3742                 *res = (uint32_t)maxread;
3743                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3744         }
3745         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3746         return status;
3747 out_overflow:
3748         print_overflow_msg(__func__, xdr);
3749         return -EIO;
3750 }
3751 
3752 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3753 {
3754         __be32 *p;
3755         int status = 0;
3756 
3757         *res = 1024;
3758         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3759                 return -EIO;
3760         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3761                 uint64_t maxwrite;
3762                 p = xdr_inline_decode(xdr, 8);
3763                 if (unlikely(!p))
3764                         goto out_overflow;
3765                 xdr_decode_hyper(p, &maxwrite);
3766                 if (maxwrite > 0x7FFFFFFF)
3767                         maxwrite = 0x7FFFFFFF;
3768                 *res = (uint32_t)maxwrite;
3769                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3770         }
3771         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3772         return status;
3773 out_overflow:
3774         print_overflow_msg(__func__, xdr);
3775         return -EIO;
3776 }
3777 
3778 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3779 {
3780         uint32_t tmp;
3781         __be32 *p;
3782         int ret = 0;
3783 
3784         *mode = 0;
3785         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3786                 return -EIO;
3787         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3788                 p = xdr_inline_decode(xdr, 4);
3789                 if (unlikely(!p))
3790                         goto out_overflow;
3791                 tmp = be32_to_cpup(p);
3792                 *mode = tmp & ~S_IFMT;
3793                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3794                 ret = NFS_ATTR_FATTR_MODE;
3795         }
3796         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3797         return ret;
3798 out_overflow:
3799         print_overflow_msg(__func__, xdr);
3800         return -EIO;
3801 }
3802 
3803 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3804 {
3805         __be32 *p;
3806         int ret = 0;
3807 
3808         *nlink = 1;
3809         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3810                 return -EIO;
3811         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3812                 p = xdr_inline_decode(xdr, 4);
3813                 if (unlikely(!p))
3814                         goto out_overflow;
3815                 *nlink = be32_to_cpup(p);
3816                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3817                 ret = NFS_ATTR_FATTR_NLINK;
3818         }
3819         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3820         return ret;
3821 out_overflow:
3822         print_overflow_msg(__func__, xdr);
3823         return -EIO;
3824 }
3825 
3826 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3827                 const struct nfs_server *server, kuid_t *uid,
3828                 struct nfs4_string *owner_name)
3829 {
3830         uint32_t len;
3831         __be32 *p;
3832         int ret = 0;
3833 
3834         *uid = make_kuid(&init_user_ns, -2);
3835         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3836                 return -EIO;
3837         if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3838                 p = xdr_inline_decode(xdr, 4);
3839                 if (unlikely(!p))
3840                         goto out_overflow;
3841                 len = be32_to_cpup(p);
3842                 p = xdr_inline_decode(xdr, len);
3843                 if (unlikely(!p))
3844                         goto out_overflow;
3845                 if (owner_name != NULL) {
3846                         owner_name->data = kmemdup(p, len, GFP_NOWAIT);
3847                         if (owner_name->data != NULL) {
3848                                 owner_name->len = len;
3849                                 ret = NFS_ATTR_FATTR_OWNER_NAME;
3850                         }
3851                 } else if (len < XDR_MAX_NETOBJ) {
3852                         if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
3853                                 ret = NFS_ATTR_FATTR_OWNER;
3854                         else
3855                                 dprintk("%s: nfs_map_name_to_uid failed!\n",
3856                                                 __func__);
3857                 } else
3858                         dprintk("%s: name too long (%u)!\n",
3859                                         __func__, len);
3860                 bitmap[1] &= ~FATTR4_WORD1_OWNER;
3861         }
3862         dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3863         return ret;
3864 out_overflow:
3865         print_overflow_msg(__func__, xdr);
3866         return -EIO;
3867 }
3868 
3869 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3870                 const struct nfs_server *server, kgid_t *gid,
3871                 struct nfs4_string *group_name)
3872 {
3873         uint32_t len;
3874         __be32 *p;
3875         int ret = 0;
3876 
3877         *gid = make_kgid(&init_user_ns, -2);
3878         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3879                 return -EIO;
3880         if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3881                 p = xdr_inline_decode(xdr, 4);
3882                 if (unlikely(!p))
3883                         goto out_overflow;
3884                 len = be32_to_cpup(p);
3885                 p = xdr_inline_decode(xdr, len);
3886                 if (unlikely(!p))
3887                         goto out_overflow;
3888                 if (group_name != NULL) {
3889                         group_name->data = kmemdup(p, len, GFP_NOWAIT);
3890                         if (group_name->data != NULL) {
3891                                 group_name->len = len;
3892                                 ret = NFS_ATTR_FATTR_GROUP_NAME;
3893                         }
3894                 } else if (len < XDR_MAX_NETOBJ) {
3895                         if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
3896                                 ret = NFS_ATTR_FATTR_GROUP;
3897                         else
3898                                 dprintk("%s: nfs_map_group_to_gid failed!\n",
3899                                                 __func__);
3900                 } else
3901                         dprintk("%s: name too long (%u)!\n",
3902                                         __func__, len);
3903                 bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3904         }
3905         dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3906         return ret;
3907 out_overflow:
3908         print_overflow_msg(__func__, xdr);
3909         return -EIO;
3910 }
3911 
3912 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3913 {
3914         uint32_t major = 0, minor = 0;
3915         __be32 *p;
3916         int ret = 0;
3917 
3918         *rdev = MKDEV(0,0);
3919         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3920                 return -EIO;
3921         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3922                 dev_t tmp;
3923 
3924                 p = xdr_inline_decode(xdr, 8);
3925                 if (unlikely(!p))
3926                         goto out_overflow;
3927                 major = be32_to_cpup(p++);
3928                 minor = be32_to_cpup(p);
3929                 tmp = MKDEV(major, minor);
3930                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3931                         *rdev = tmp;
3932                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3933                 ret = NFS_ATTR_FATTR_RDEV;
3934         }
3935         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3936         return ret;
3937 out_overflow:
3938         print_overflow_msg(__func__, xdr);
3939         return -EIO;
3940 }
3941 
3942 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3943 {
3944         __be32 *p;
3945         int status = 0;
3946 
3947         *res = 0;
3948         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3949                 return -EIO;
3950         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3951                 p = xdr_inline_decode(xdr, 8);
3952                 if (unlikely(!p))
3953                         goto out_overflow;
3954                 xdr_decode_hyper(p, res);
3955                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3956         }
3957         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3958         return status;
3959 out_overflow:
3960         print_overflow_msg(__func__, xdr);
3961         return -EIO;
3962 }
3963 
3964 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3965 {
3966         __be32 *p;
3967         int status = 0;
3968 
3969         *res = 0;
3970         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3971                 return -EIO;
3972         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3973                 p = xdr_inline_decode(xdr, 8);
3974                 if (unlikely(!p))
3975                         goto out_overflow;
3976                 xdr_decode_hyper(p, res);
3977                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3978         }
3979         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3980         return status;
3981 out_overflow:
3982         print_overflow_msg(__func__, xdr);
3983         return -EIO;
3984 }
3985 
3986 static int decode_attr_space_total(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_TOTAL - 1U)))
3993                 return -EIO;
3994         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
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_TOTAL;
4000         }
4001         dprintk("%s: space total=%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_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4009 {
4010         __be32 *p;
4011         int ret = 0;
4012 
4013         *used = 0;
4014         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4015                 return -EIO;
4016         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4017                 p = xdr_inline_decode(xdr, 8);
4018                 if (unlikely(!p))
4019                         goto out_overflow;
4020                 xdr_decode_hyper(p, used);
4021                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4022                 ret = NFS_ATTR_FATTR_SPACE_USED;
4023         }
4024         dprintk("%s: space used=%Lu\n", __func__,
4025                         (unsigned long long)*used);
4026         return ret;
4027 out_overflow:
4028         print_overflow_msg(__func__, xdr);
4029         return -EIO;
4030 }
4031 
4032 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4033 {
4034         __be32 *p;
4035         uint64_t sec;
4036         uint32_t nsec;
4037 
4038         p = xdr_inline_decode(xdr, 12);
4039         if (unlikely(!p))
4040                 goto out_overflow;
4041         p = xdr_decode_hyper(p, &sec);
4042         nsec = be32_to_cpup(p);
4043         time->tv_sec = (time_t)sec;
4044         time->tv_nsec = (long)nsec;
4045         return 0;
4046 out_overflow:
4047         print_overflow_msg(__func__, xdr);
4048         return -EIO;
4049 }
4050 
4051 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4052 {
4053         int status = 0;
4054 
4055         time->tv_sec = 0;
4056         time->tv_nsec = 0;
4057         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4058                 return -EIO;
4059         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4060                 status = decode_attr_time(xdr, time);
4061                 if (status == 0)
4062                         status = NFS_ATTR_FATTR_ATIME;
4063                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4064         }
4065         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4066         return status;
4067 }
4068 
4069 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4070 {
4071         int status = 0;
4072 
4073         time->tv_sec = 0;
4074         time->tv_nsec = 0;
4075         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4076                 return -EIO;
4077         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4078                 status = decode_attr_time(xdr, time);
4079                 if (status == 0)
4080                         status = NFS_ATTR_FATTR_CTIME;
4081                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4082         }
4083         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4084         return status;
4085 }
4086 
4087 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4088                                   struct timespec *time)
4089 {
4090         int status = 0;
4091 
4092         time->tv_sec = 0;
4093         time->tv_nsec = 0;
4094         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4095                 return -EIO;
4096         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4097                 status = decode_attr_time(xdr, time);
4098                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4099         }
4100         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4101                 (long)time->tv_nsec);
4102         return status;
4103 }
4104 
4105 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4106                                         struct nfs4_label *label)
4107 {
4108         uint32_t pi = 0;
4109         uint32_t lfs = 0;
4110         __u32 len;
4111         __be32 *p;
4112         int status = 0;
4113 
4114         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4115                 return -EIO;
4116         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4117                 p = xdr_inline_decode(xdr, 4);
4118                 if (unlikely(!p))
4119                         goto out_overflow;
4120                 lfs = be32_to_cpup(p++);
4121                 p = xdr_inline_decode(xdr, 4);
4122                 if (unlikely(!p))
4123                         goto out_overflow;
4124                 pi = be32_to_cpup(p++);
4125                 p = xdr_inline_decode(xdr, 4);
4126                 if (unlikely(!p))
4127                         goto out_overflow;
4128                 len = be32_to_cpup(p++);
4129                 p = xdr_inline_decode(xdr, len);
4130                 if (unlikely(!p))
4131                         goto out_overflow;
4132                 if (len < NFS4_MAXLABELLEN) {
4133                         if (label) {
4134                                 memcpy(label->label, p, len);
4135                                 label->len = len;
4136                                 label->pi = pi;
4137                                 label->lfs = lfs;
4138                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4139                         }
4140                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4141                 } else
4142                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4143                                         __func__, len);
4144         }
4145         if (label && label->label)
4146                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4147                         (char *)label->label, label->len, label->pi, label->lfs);
4148         return status;
4149 
4150 out_overflow:
4151         print_overflow_msg(__func__, xdr);
4152         return -EIO;
4153 }
4154 
4155 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4156 {
4157         int status = 0;
4158 
4159         time->tv_sec = 0;
4160         time->tv_nsec = 0;
4161         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4162                 return -EIO;
4163         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4164                 status = decode_attr_time(xdr, time);
4165                 if (status == 0)
4166                         status = NFS_ATTR_FATTR_MTIME;
4167                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4168         }
4169         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4170         return status;
4171 }
4172 
4173 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4174 {
4175         unsigned int attrwords = XDR_QUADLEN(attrlen);
4176         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4177 
4178         if (unlikely(attrwords != nwords)) {
4179                 dprintk("%s: server returned incorrect attribute length: "
4180                         "%u %c %u\n",
4181                                 __func__,
4182                                 attrwords << 2,
4183                                 (attrwords < nwords) ? '<' : '>',
4184                                 nwords << 2);
4185                 return -EIO;
4186         }
4187         return 0;
4188 }
4189 
4190 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4191 {
4192         __be32 *p;
4193 
4194         p = xdr_inline_decode(xdr, 20);
4195         if (unlikely(!p))
4196                 goto out_overflow;
4197         cinfo->atomic = be32_to_cpup(p++);
4198         p = xdr_decode_hyper(p, &cinfo->before);
4199         xdr_decode_hyper(p, &cinfo->after);
4200         return 0;
4201 out_overflow:
4202         print_overflow_msg(__func__, xdr);
4203         return -EIO;
4204 }
4205 
4206 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4207 {
4208         __be32 *p;
4209         uint32_t supp, acc;
4210         int status;
4211 
4212         status = decode_op_hdr(xdr, OP_ACCESS);
4213         if (status)
4214                 return status;
4215         p = xdr_inline_decode(xdr, 8);
4216         if (unlikely(!p))
4217                 goto out_overflow;
4218         supp = be32_to_cpup(p++);
4219         acc = be32_to_cpup(p);
4220         *supported = supp;
4221         *access = acc;
4222         return 0;
4223 out_overflow:
4224         print_overflow_msg(__func__, xdr);
4225         return -EIO;
4226 }
4227 
4228 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4229 {
4230         __be32 *p;
4231 
4232         p = xdr_inline_decode(xdr, len);
4233         if (likely(p)) {
4234                 memcpy(buf, p, len);
4235                 return 0;
4236         }
4237         print_overflow_msg(__func__, xdr);
4238         return -EIO;
4239 }
4240 
4241 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4242 {
4243         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4244 }
4245 
4246 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4247 {
4248         int status;
4249 
4250         status = decode_op_hdr(xdr, OP_CLOSE);
4251         if (status != -EIO)
4252                 nfs_increment_open_seqid(status, res->seqid);
4253         if (!status)
4254                 status = decode_stateid(xdr, &res->stateid);
4255         return status;
4256 }
4257 
4258 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4259 {
4260         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4261 }
4262 
4263 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4264 {
4265         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4266 }
4267 
4268 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4269 {
4270         int status;
4271 
4272         status = decode_op_hdr(xdr, OP_COMMIT);
4273         if (!status)
4274                 status = decode_write_verifier(xdr, &res->verf->verifier);
4275         return status;
4276 }
4277 
4278 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4279 {
4280         __be32 *p;
4281         uint32_t bmlen;
4282         int status;
4283 
4284         status = decode_op_hdr(xdr, OP_CREATE);
4285         if (status)
4286                 return status;
4287         if ((status = decode_change_info(xdr, cinfo)))
4288                 return status;
4289         p = xdr_inline_decode(xdr, 4);
4290         if (unlikely(!p))
4291                 goto out_overflow;
4292         bmlen = be32_to_cpup(p);
4293         p = xdr_inline_decode(xdr, bmlen << 2);
4294         if (likely(p))
4295                 return 0;
4296 out_overflow:
4297         print_overflow_msg(__func__, xdr);
4298         return -EIO;
4299 }
4300 
4301 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4302 {
4303         unsigned int savep;
4304         uint32_t attrlen, bitmap[3] = {0};
4305         int status;
4306 
4307         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4308                 goto xdr_error;
4309         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4310                 goto xdr_error;
4311         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4312                 goto xdr_error;
4313         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4314                 goto xdr_error;
4315         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4316                                                  &res->fh_expire_type)) != 0)
4317                 goto xdr_error;
4318         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4319                 goto xdr_error;
4320         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4321                 goto xdr_error;
4322         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4323                 goto xdr_error;
4324         status = verify_attr_len(xdr, savep, attrlen);
4325 xdr_error:
4326         dprintk("%s: xdr returned %d!\n", __func__, -status);
4327         return status;
4328 }
4329 
4330 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4331 {
4332         unsigned int savep;
4333         uint32_t attrlen, bitmap[3] = {0};
4334         int status;
4335 
4336         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4337                 goto xdr_error;
4338         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4339                 goto xdr_error;
4340         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4341                 goto xdr_error;
4342 
4343         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4344                 goto xdr_error;
4345         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4346                 goto xdr_error;
4347         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4348                 goto xdr_error;
4349         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4350                 goto xdr_error;
4351         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4352                 goto xdr_error;
4353         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4354                 goto xdr_error;
4355 
4356         status = verify_attr_len(xdr, savep, attrlen);
4357 xdr_error:
4358         dprintk("%s: xdr returned %d!\n", __func__, -status);
4359         return status;
4360 }
4361 
4362 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4363 {
4364         unsigned int savep;
4365         uint32_t attrlen, bitmap[3] = {0};
4366         int status;
4367 
4368         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4369                 goto xdr_error;
4370         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4371                 goto xdr_error;
4372         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4373                 goto xdr_error;
4374 
4375         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4376                 goto xdr_error;
4377         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4378                 goto xdr_error;
4379 
4380         status = verify_attr_len(xdr, savep, attrlen);
4381 xdr_error:
4382         dprintk("%s: xdr returned %d!\n", __func__, -status);
4383         return status;
4384 }
4385 
4386 static int decode_threshold_hint(struct xdr_stream *xdr,
4387                                   uint32_t *bitmap,
4388                                   uint64_t *res,
4389                                   uint32_t hint_bit)
4390 {
4391         __be32 *p;
4392 
4393         *res = 0;
4394         if (likely(bitmap[0] & hint_bit)) {
4395                 p = xdr_inline_decode(xdr, 8);
4396                 if (unlikely(!p))
4397                         goto out_overflow;
4398                 xdr_decode_hyper(p, res);
4399         }
4400         return 0;
4401 out_overflow:
4402         print_overflow_msg(__func__, xdr);
4403         return -EIO;
4404 }
4405 
4406 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4407                                         struct nfs4_threshold *res)
4408 {
4409         __be32 *p;
4410         unsigned int savep;
4411         uint32_t bitmap[3] = {0,}, attrlen;
4412         int status;
4413 
4414         /* layout type */
4415         p = xdr_inline_decode(xdr, 4);
4416         if (unlikely(!p)) {
4417                 print_overflow_msg(__func__, xdr);
4418                 return -EIO;
4419         }
4420         res->l_type = be32_to_cpup(p);
4421 
4422         /* thi_hintset bitmap */
4423         status = decode_attr_bitmap(xdr, bitmap);
4424         if (status < 0)
4425                 goto xdr_error;
4426 
4427         /* thi_hintlist length */
4428         status = decode_attr_length(xdr, &attrlen, &savep);
4429         if (status < 0)
4430                 goto xdr_error;
4431         /* thi_hintlist */
4432         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4433         if (status < 0)
4434                 goto xdr_error;
4435         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4436         if (status < 0)
4437                 goto xdr_error;
4438         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4439                                        THRESHOLD_RD_IO);
4440         if (status < 0)
4441                 goto xdr_error;
4442         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4443                                        THRESHOLD_WR_IO);
4444         if (status < 0)
4445                 goto xdr_error;
4446 
4447         status = verify_attr_len(xdr, savep, attrlen);
4448         res->bm = bitmap[0];
4449 
4450         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4451                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4452                 res->wr_io_sz);
4453 xdr_error:
4454         dprintk("%s ret=%d!\n", __func__, status);
4455         return status;
4456 }
4457 
4458 /*
4459  * Thresholds on pNFS direct I/O vrs MDS I/O
4460  */
4461 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4462                                     uint32_t *bitmap,
4463                                     struct nfs4_threshold *res)
4464 {
4465         __be32 *p;
4466         int status = 0;
4467         uint32_t num;
4468 
4469         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4470                 return -EIO;
4471         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4472                 /* Did the server return an unrequested attribute? */
4473                 if (unlikely(res == NULL))
4474                         return -EREMOTEIO;
4475                 p = xdr_inline_decode(xdr, 4);
4476                 if (unlikely(!p))
4477                         goto out_overflow;
4478                 num = be32_to_cpup(p);
4479                 if (num == 0)
4480                         return 0;
4481                 if (num > 1)
4482                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4483                                 "drivers per filesystem not supported\n",
4484                                 __func__);
4485 
4486                 status = decode_first_threshold_item4(xdr, res);
4487                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4488         }
4489         return status;
4490 out_overflow:
4491         print_overflow_msg(__func__, xdr);
4492         return -EIO;
4493 }
4494 
4495 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4496                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4497                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4498                 const struct nfs_server *server)
4499 {
4500         int status;
4501         umode_t fmode = 0;
4502         uint32_t type;
4503         int32_t err;
4504 
4505         status = decode_attr_type(xdr, bitmap, &type);
4506         if (status < 0)
4507                 goto xdr_error;
4508         fattr->mode = 0;
4509         if (status != 0) {
4510                 fattr->mode |= nfs_type2fmt[type];
4511                 fattr->valid |= status;
4512         }
4513 
4514         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4515         if (status < 0)
4516                 goto xdr_error;
4517         fattr->valid |= status;
4518 
4519         status = decode_attr_size(xdr, bitmap, &fattr->size);
4520         if (status < 0)
4521                 goto xdr_error;
4522         fattr->valid |= status;
4523 
4524         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4525         if (status < 0)
4526                 goto xdr_error;
4527         fattr->valid |= status;
4528 
4529         err = 0;
4530         status = decode_attr_error(xdr, bitmap, &err);
4531         if (status < 0)
4532                 goto xdr_error;
4533 
4534         status = decode_attr_filehandle(xdr, bitmap, fh);
4535         if (status < 0)
4536                 goto xdr_error;
4537 
4538         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4539         if (status < 0)
4540                 goto xdr_error;
4541         fattr->valid |= status;
4542 
4543         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4544         if (status < 0)
4545                 goto xdr_error;
4546         fattr->valid |= status;
4547 
4548         status = decode_attr_mode(xdr, bitmap, &fmode);
4549         if (status < 0)
4550                 goto xdr_error;
4551         if (status != 0) {
4552                 fattr->mode |= fmode;
4553                 fattr->valid |= status;
4554         }
4555 
4556         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4557         if (status < 0)
4558                 goto xdr_error;
4559         fattr->valid |= status;
4560 
4561         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4562         if (status < 0)
4563                 goto xdr_error;
4564         fattr->valid |= status;
4565 
4566         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4567         if (status < 0)
4568                 goto xdr_error;
4569         fattr->valid |= status;
4570 
4571         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4572         if (status < 0)
4573                 goto xdr_error;
4574         fattr->valid |= status;
4575 
4576         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4577         if (status < 0)
4578                 goto xdr_error;
4579         fattr->valid |= status;
4580 
4581         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4582         if (status < 0)
4583                 goto xdr_error;
4584         fattr->valid |= status;
4585 
4586         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4587         if (status < 0)
4588                 goto xdr_error;
4589         fattr->valid |= status;
4590 
4591         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4592         if (status < 0)
4593                 goto xdr_error;
4594         fattr->valid |= status;
4595 
4596         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4597         if (status < 0)
4598                 goto xdr_error;
4599         fattr->valid |= status;
4600 
4601         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4602         if (status < 0)
4603                 goto xdr_error;
4604 
4605         if (label) {
4606                 status = decode_attr_security_label(xdr, bitmap, label);
4607                 if (status < 0)
4608                         goto xdr_error;
4609                 fattr->valid |= status;
4610         }
4611 
4612 xdr_error:
4613         dprintk("%s: xdr returned %d\n", __func__, -status);
4614         return status;
4615 }
4616 
4617 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4618                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4619                 struct nfs4_label *label, const struct nfs_server *server)
4620 {
4621         unsigned int savep;
4622         uint32_t attrlen,
4623                  bitmap[3] = {0};
4624         int status;
4625 
4626         status = decode_op_hdr(xdr, OP_GETATTR);
4627         if (status < 0)
4628                 goto xdr_error;
4629 
4630         status = decode_attr_bitmap(xdr, bitmap);
4631         if (status < 0)
4632                 goto xdr_error;
4633 
4634         status = decode_attr_length(xdr, &attrlen, &savep);
4635         if (status < 0)
4636                 goto xdr_error;
4637 
4638         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4639                                         label, server);
4640         if (status < 0)
4641                 goto xdr_error;
4642 
4643         status = verify_attr_len(xdr, savep, attrlen);
4644 xdr_error:
4645         dprintk("%s: xdr returned %d\n", __func__, -status);
4646         return status;
4647 }
4648 
4649 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4650                 struct nfs4_label *label, const struct nfs_server *server)
4651 {
4652         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4653 }
4654 
4655 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4656                 const struct nfs_server *server)
4657 {
4658         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4659 }
4660 
4661 /*
4662  * Decode potentially multiple layout types. Currently we only support
4663  * one layout driver per file system.
4664  */
4665 static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
4666                                          uint32_t *layouttype)
4667 {
4668         __be32 *p;
4669         int num;
4670 
4671         p = xdr_inline_decode(xdr, 4);
4672         if (unlikely(!p))
4673                 goto out_overflow;
4674         num = be32_to_cpup(p);
4675 
4676         /* pNFS is not supported by the underlying file system */
4677         if (num == 0) {
4678                 *layouttype = 0;
4679                 return 0;
4680         }
4681         if (num > 1)
4682                 printk(KERN_INFO "NFS: %s: Warning: Multiple pNFS layout "
4683                         "drivers per filesystem not supported\n", __func__);
4684 
4685         /* Decode and set first layout type, move xdr->p past unused types */
4686         p = xdr_inline_decode(xdr, num * 4);
4687         if (unlikely(!p))
4688                 goto out_overflow;
4689         *layouttype = be32_to_cpup(p);
4690         return 0;
4691 out_overflow:
4692         print_overflow_msg(__func__, xdr);
4693         return -EIO;
4694 }
4695 
4696 /*
4697  * The type of file system exported.
4698  * Note we must ensure that layouttype is set in any non-error case.
4699  */
4700 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4701                                 uint32_t *layouttype)
4702 {
4703         int status = 0;
4704 
4705         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4706         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4707                 return -EIO;
4708         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4709                 status = decode_first_pnfs_layout_type(xdr, layouttype);
4710                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4711         } else
4712                 *layouttype = 0;
4713         return status;
4714 }
4715 
4716 /*
4717  * The prefered block size for layout directed io
4718  */
4719 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4720                                       uint32_t *res)
4721 {
4722         __be32 *p;
4723 
4724         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4725         *res = 0;
4726         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4727                 p = xdr_inline_decode(xdr, 4);
4728                 if (unlikely(!p)) {
4729                         print_overflow_msg(__func__, xdr);
4730                         return -EIO;
4731                 }
4732                 *res = be32_to_cpup(p);
4733                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4734         }
4735         return 0;
4736 }
4737 
4738 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4739 {
4740         unsigned int savep;
4741         uint32_t attrlen, bitmap[3];
4742         int status;
4743 
4744         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4745                 goto xdr_error;
4746         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4747                 goto xdr_error;
4748         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4749                 goto xdr_error;
4750 
4751         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4752 
4753         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4754                 goto xdr_error;
4755         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4756                 goto xdr_error;
4757         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4758                 goto xdr_error;
4759         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4760         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4761                 goto xdr_error;
4762         fsinfo->wtpref = fsinfo->wtmax;
4763         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4764         if (status != 0)
4765                 goto xdr_error;
4766         status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4767         if (status != 0)
4768                 goto xdr_error;
4769         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4770         if (status)
4771                 goto xdr_error;
4772 
4773         status = verify_attr_len(xdr, savep, attrlen);
4774 xdr_error:
4775         dprintk("%s: xdr returned %d!\n", __func__, -status);
4776         return status;
4777 }
4778 
4779 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4780 {
4781         __be32 *p;
4782         uint32_t len;
4783         int status;
4784 
4785         /* Zero handle first to allow comparisons */
4786         memset(fh, 0, sizeof(*fh));
4787 
4788         status = decode_op_hdr(xdr, OP_GETFH);
4789         if (status)
4790                 return status;
4791 
4792         p = xdr_inline_decode(xdr, 4);
4793         if (unlikely(!p))
4794                 goto out_overflow;
4795         len = be32_to_cpup(p);
4796         if (len > NFS4_FHSIZE)
4797                 return -EIO;
4798         fh->size = len;
4799         p = xdr_inline_decode(xdr, len);
4800         if (unlikely(!p))
4801                 goto out_overflow;
4802         memcpy(fh->data, p, len);
4803         return 0;
4804 out_overflow:
4805         print_overflow_msg(__func__, xdr);
4806         return -EIO;
4807 }
4808 
4809 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4810 {
4811         int status;
4812 
4813         status = decode_op_hdr(xdr, OP_LINK);
4814         if (status)
4815                 return status;
4816         return decode_change_info(xdr, cinfo);
4817 }
4818 
4819 /*
4820  * We create the owner, so we know a proper owner.id length is 4.
4821  */
4822 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4823 {
4824         uint64_t offset, length, clientid;
4825         __be32 *p;
4826         uint32_t namelen, type;
4827 
4828         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4829         if (unlikely(!p))
4830                 goto out_overflow;
4831         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4832         p = xdr_decode_hyper(p, &length);
4833         type = be32_to_cpup(p++); /* 4 byte read */
4834         if (fl != NULL) { /* manipulate file lock */
4835                 fl->fl_start = (loff_t)offset;
4836                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4837                 if (length == ~(uint64_t)0)
4838                         fl->fl_end = OFFSET_MAX;
4839                 fl->fl_type = F_WRLCK;
4840                 if (type & 1)
4841                         fl->fl_type = F_RDLCK;
4842                 fl->fl_pid = 0;
4843         }
4844         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4845         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4846         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4847         if (likely(p))
4848                 return -NFS4ERR_DENIED;
4849 out_overflow:
4850         print_overflow_msg(__func__, xdr);
4851         return -EIO;
4852 }
4853 
4854 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4855 {
4856         int status;
4857 
4858         status = decode_op_hdr(xdr, OP_LOCK);
4859         if (status == -EIO)
4860                 goto out;
4861         if (status == 0) {
4862                 status = decode_stateid(xdr, &res->stateid);
4863                 if (unlikely(status))
4864                         goto out;
4865         } else if (status == -NFS4ERR_DENIED)
4866                 status = decode_lock_denied(xdr, NULL);
4867         if (res->open_seqid != NULL)
4868                 nfs_increment_open_seqid(status, res->open_seqid);
4869         nfs_increment_lock_seqid(status, res->lock_seqid);
4870 out:
4871         return status;
4872 }
4873 
4874 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4875 {
4876         int status;
4877         status = decode_op_hdr(xdr, OP_LOCKT);
4878         if (status == -NFS4ERR_DENIED)
4879                 return decode_lock_denied(xdr, res->denied);
4880         return status;
4881 }
4882 
4883 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4884 {
4885         int status;
4886 
4887         status = decode_op_hdr(xdr, OP_LOCKU);
4888         if (status != -EIO)
4889                 nfs_increment_lock_seqid(status, res->seqid);
4890         if (status == 0)
4891                 status = decode_stateid(xdr, &res->stateid);
4892         return status;
4893 }
4894 
4895 static int decode_release_lockowner(struct xdr_stream *xdr)
4896 {
4897         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4898 }
4899 
4900 static int decode_lookup(struct xdr_stream *xdr)
4901 {
4902         return decode_op_hdr(xdr, OP_LOOKUP);
4903 }
4904 
4905 /* This is too sick! */
4906 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4907 {
4908         __be32 *p;
4909         uint32_t limit_type, nblocks, blocksize;
4910 
4911         p = xdr_inline_decode(xdr, 12);
4912         if (unlikely(!p))
4913                 goto out_overflow;
4914         limit_type = be32_to_cpup(p++);
4915         switch (limit_type) {
4916         case 1:
4917                 xdr_decode_hyper(p, maxsize);
4918                 break;
4919         case 2:
4920                 nblocks = be32_to_cpup(p++);
4921                 blocksize = be32_to_cpup(p);
4922                 *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4923         }
4924         return 0;
4925 out_overflow:
4926         print_overflow_msg(__func__, xdr);
4927         return -EIO;
4928 }
4929 
4930 static int decode_rw_delegation(struct xdr_stream *xdr,
4931                 uint32_t delegation_type,
4932                 struct nfs_openres *res)
4933 {
4934         __be32 *p;
4935         int status;
4936 
4937         status = decode_stateid(xdr, &res->delegation);
4938         if (unlikely(status))
4939                 return status;
4940         p = xdr_inline_decode(xdr, 4);
4941         if (unlikely(!p))
4942                 goto out_overflow;
4943         res->do_recall = be32_to_cpup(p);
4944 
4945         switch (delegation_type) {
4946         case NFS4_OPEN_DELEGATE_READ:
4947                 res->delegation_type = FMODE_READ;
4948                 break;
4949         case NFS4_OPEN_DELEGATE_WRITE:
4950                 res->delegation_type = FMODE_WRITE|FMODE_READ;
4951                 if (decode_space_limit(xdr, &res->maxsize) < 0)
4952                                 return -EIO;
4953         }
4954         return decode_ace(xdr, NULL, res->server->nfs_client);
4955 out_overflow:
4956         print_overflow_msg(__func__, xdr);
4957         return -EIO;
4958 }
4959 
4960 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4961 {
4962         __be32 *p;
4963         uint32_t why_no_delegation;
4964 
4965         p = xdr_inline_decode(xdr, 4);
4966         if (unlikely(!p))
4967                 goto out_overflow;
4968         why_no_delegation = be32_to_cpup(p);
4969         switch (why_no_delegation) {
4970                 case WND4_CONTENTION:
4971                 case WND4_RESOURCE:
4972                         xdr_inline_decode(xdr, 4);
4973                         /* Ignore for now */
4974         }
4975         return 0;
4976 out_overflow:
4977         print_overflow_msg(__func__, xdr);
4978         return -EIO;
4979 }
4980 
4981 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4982 {
4983         __be32 *p;
4984         uint32_t delegation_type;
4985 
4986         p = xdr_inline_decode(xdr, 4);
4987         if (unlikely(!p))
4988                 goto out_overflow;
4989         delegation_type = be32_to_cpup(p);
4990         res->delegation_type = 0;
4991         switch (delegation_type) {
4992         case NFS4_OPEN_DELEGATE_NONE:
4993                 return 0;
4994         case NFS4_OPEN_DELEGATE_READ:
4995         case NFS4_OPEN_DELEGATE_WRITE:
4996                 return decode_rw_delegation(xdr, delegation_type, res);
4997         case NFS4_OPEN_DELEGATE_NONE_EXT:
4998                 return decode_no_delegation(xdr, res);
4999         }
5000         return -EIO;
5001 out_overflow:
5002         print_overflow_msg(__func__, xdr);
5003         return -EIO;
5004 }
5005 
5006 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5007 {
5008         __be32 *p;
5009         uint32_t savewords, bmlen, i;
5010         int status;
5011 
5012         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5013                 return status;
5014         nfs_increment_open_seqid(status, res->seqid);
5015         if (status)
5016                 return status;
5017         status = decode_stateid(xdr, &res->stateid);
5018         if (unlikely(status))
5019                 return status;
5020 
5021         decode_change_info(xdr, &res->cinfo);
5022 
5023         p = xdr_inline_decode(xdr, 8);
5024         if (unlikely(!p))
5025                 goto out_overflow;
5026         res->rflags = be32_to_cpup(p++);
5027         bmlen = be32_to_cpup(p);
5028         if (bmlen > 10)
5029                 goto xdr_error;
5030 
5031         p = xdr_inline_decode(xdr, bmlen << 2);
5032         if (unlikely(!p))
5033                 goto out_overflow;
5034         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5035         for (i = 0; i < savewords; ++i)
5036                 res->attrset[i] = be32_to_cpup(p++);
5037         for (; i < NFS4_BITMAP_SIZE; i++)
5038                 res->attrset[i] = 0;
5039 
5040         return decode_delegation(xdr, res);
5041 xdr_error:
5042         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5043         return -EIO;
5044 out_overflow:
5045         print_overflow_msg(__func__, xdr);
5046         return -EIO;
5047 }
5048 
5049 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5050 {
5051         int status;
5052 
5053         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5054         if (status != -EIO)
5055                 nfs_increment_open_seqid(status, res->seqid);
5056         if (!status)
5057                 status = decode_stateid(xdr, &res->stateid);
5058         return status;
5059 }
5060 
5061 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5062 {
5063         int status;
5064 
5065         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5066         if (status != -EIO)
5067                 nfs_increment_open_seqid(status, res->seqid);
5068         if (!status)
5069                 status = decode_stateid(xdr, &res->stateid);
5070         return status;
5071 }
5072 
5073 static int decode_putfh(struct xdr_stream *xdr)
5074 {
5075         return decode_op_hdr(xdr, OP_PUTFH);
5076 }
5077 
5078 static int decode_putrootfh(struct xdr_stream *xdr)
5079 {
5080         return decode_op_hdr(xdr, OP_PUTROOTFH);
5081 }
5082 
5083 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5084                        struct nfs_pgio_res *res)
5085 {
5086         __be32 *p;
5087         uint32_t count, eof, recvd;
5088         int status;
5089 
5090         status = decode_op_hdr(xdr, OP_READ);
5091         if (status)
5092                 return status;
5093         p = xdr_inline_decode(xdr, 8);
5094         if (unlikely(!p))
5095                 goto out_overflow;
5096         eof = be32_to_cpup(p++);
5097         count = be32_to_cpup(p);
5098         recvd = xdr_read_pages(xdr, count);
5099         if (count > recvd) {
5100                 dprintk("NFS: server cheating in read reply: "
5101                                 "count %u > recvd %u\n", count, recvd);
5102                 count = recvd;
5103                 eof = 0;
5104         }
5105         res->eof = eof;
5106         res->count = count;
5107         return 0;
5108 out_overflow:
5109         print_overflow_msg(__func__, xdr);
5110         return -EIO;
5111 }
5112 
5113 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5114 {
5115         int             status;
5116         __be32          verf[2];
5117 
5118         status = decode_op_hdr(xdr, OP_READDIR);
5119         if (!status)
5120                 status = decode_verifier(xdr, readdir->verifier.data);
5121         if (unlikely(status))
5122                 return status;
5123         memcpy(verf, readdir->verifier.data, sizeof(verf));
5124         dprintk("%s: verifier = %08x:%08x\n",
5125                         __func__, verf[0], verf[1]);
5126         return xdr_read_pages(xdr, xdr->buf->page_len);
5127 }
5128 
5129 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5130 {
5131         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5132         u32 len, recvd;
5133         __be32 *p;
5134         int status;
5135 
5136         status = decode_op_hdr(xdr, OP_READLINK);
5137         if (status)
5138                 return status;
5139 
5140         /* Convert length of symlink */
5141         p = xdr_inline_decode(xdr, 4);
5142         if (unlikely(!p))
5143                 goto out_overflow;
5144         len = be32_to_cpup(p);
5145         if (len >= rcvbuf->page_len || len <= 0) {
5146                 dprintk("nfs: server returned giant symlink!\n");
5147                 return -ENAMETOOLONG;
5148         }
5149         recvd = xdr_read_pages(xdr, len);
5150         if (recvd < len) {
5151                 dprintk("NFS: server cheating in readlink reply: "
5152                                 "count %u > recvd %u\n", len, recvd);
5153                 return -EIO;
5154         }
5155         /*
5156          * The XDR encode routine has set things up so that
5157          * the link text will be copied directly into the
5158          * buffer.  We just have to do overflow-checking,
5159          * and and null-terminate the text (the VFS expects
5160          * null-termination).
5161          */
5162         xdr_terminate_string(rcvbuf, len);
5163         return 0;
5164 out_overflow:
5165         print_overflow_msg(__func__, xdr);
5166         return -EIO;
5167 }
5168 
5169 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5170 {
5171         int status;
5172 
5173         status = decode_op_hdr(xdr, OP_REMOVE);
5174         if (status)
5175                 goto out;
5176         status = decode_change_info(xdr, cinfo);
5177 out:
5178         return status;
5179 }
5180 
5181 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5182               struct nfs4_change_info *new_cinfo)
5183 {
5184         int status;
5185 
5186         status = decode_op_hdr(xdr, OP_RENAME);
5187         if (status)
5188                 goto out;
5189         if ((status = decode_change_info(xdr, old_cinfo)))
5190                 goto out;
5191         status = decode_change_info(xdr, new_cinfo);
5192 out:
5193         return status;
5194 }
5195 
5196 static int decode_renew(struct xdr_stream *xdr)
5197 {
5198         return decode_op_hdr(xdr, OP_RENEW);
5199 }
5200 
5201 static int
5202 decode_restorefh(struct xdr_stream *xdr)
5203 {
5204         return decode_op_hdr(xdr, OP_RESTOREFH);
5205 }
5206 
5207 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5208                          struct nfs_getaclres *res)
5209 {
5210         unsigned int savep;
5211         uint32_t attrlen,
5212                  bitmap[3] = {0};
5213         int status;
5214         unsigned int pg_offset;
5215 
5216         res->acl_len = 0;
5217         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5218                 goto out;
5219 
5220         xdr_enter_page(xdr, xdr->buf->page_len);
5221 
5222         /* Calculate the offset of the page data */
5223         pg_offset = xdr->buf->head[0].iov_len;
5224 
5225         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5226                 goto out;
5227         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5228                 goto out;
5229 
5230         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5231                 return -EIO;
5232         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5233 
5234                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5235                  * are stored with the acl data to handle the problem of
5236                  * variable length bitmaps.*/
5237                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5238                 res->acl_len = attrlen;
5239 
5240                 /* Check for receive buffer overflow */
5241                 if (res->acl_len > (xdr->nwords << 2) ||
5242                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5243                         res->acl_flags |= NFS4_ACL_TRUNC;
5244                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5245                                         attrlen, xdr->nwords << 2);
5246                 }
5247         } else
5248                 status = -EOPNOTSUPP;
5249 
5250 out:
5251         return status;
5252 }
5253 
5254 static int
5255 decode_savefh(struct xdr_stream *xdr)
5256 {
5257         return decode_op_hdr(xdr, OP_SAVEFH);
5258 }
5259 
5260 static int decode_setattr(struct xdr_stream *xdr)
5261 {
5262         __be32 *p;
5263         uint32_t bmlen;
5264         int status;
5265 
5266         status = decode_op_hdr(xdr, OP_SETATTR);
5267         if (status)
5268                 return status;
5269         p = xdr_inline_decode(xdr, 4);
5270         if (unlikely(!p))
5271                 goto out_overflow;
5272         bmlen = be32_to_cpup(p);
5273         p = xdr_inline_decode(xdr, bmlen << 2);
5274         if (likely(p))
5275                 return 0;
5276 out_overflow:
5277         print_overflow_msg(__func__, xdr);
5278         return -EIO;
5279 }
5280 
5281 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5282 {
5283         __be32 *p;
5284         uint32_t opnum;
5285         int32_t nfserr;
5286 
5287         p = xdr_inline_decode(xdr, 8);
5288         if (unlikely(!p))
5289                 goto out_overflow;
5290         opnum = be32_to_cpup(p++);
5291         if (opnum != OP_SETCLIENTID) {
5292                 dprintk("nfs: decode_setclientid: Server returned operation"
5293                         " %d\n", opnum);
5294                 return -EIO;
5295         }
5296         nfserr = be32_to_cpup(p);
5297         if (nfserr == NFS_OK) {
5298                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5299                 if (unlikely(!p))
5300                         goto out_overflow;
5301                 p = xdr_decode_hyper(p, &res->clientid);
5302                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5303         } else if (nfserr == NFSERR_CLID_INUSE) {
5304                 uint32_t len;
5305 
5306                 /* skip netid string */
5307                 p = xdr_inline_decode(xdr, 4);
5308                 if (unlikely(!p))
5309                         goto out_overflow;
5310                 len = be32_to_cpup(p);
5311                 p = xdr_inline_decode(xdr, len);
5312                 if (unlikely(!p))
5313                         goto out_overflow;
5314 
5315                 /* skip uaddr string */
5316                 p = xdr_inline_decode(xdr, 4);
5317                 if (unlikely(!p))
5318                         goto out_overflow;
5319                 len = be32_to_cpup(p);
5320                 p = xdr_inline_decode(xdr, len);
5321                 if (unlikely(!p))
5322                         goto out_overflow;
5323                 return -NFSERR_CLID_INUSE;
5324         } else
5325                 return nfs4_stat_to_errno(nfserr);
5326 
5327         return 0;
5328 out_overflow:
5329         print_overflow_msg(__func__, xdr);
5330         return -EIO;
5331 }
5332 
5333 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5334 {
5335         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5336 }
5337 
5338 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5339 {
5340         __be32 *p;
5341         int status;
5342 
5343         status = decode_op_hdr(xdr, OP_WRITE);
5344         if (status)
5345                 return status;
5346 
5347         p = xdr_inline_decode(xdr, 8);
5348         if (unlikely(!p))
5349                 goto out_overflow;
5350         res->count = be32_to_cpup(p++);
5351         res->verf->committed = be32_to_cpup(p++);
5352         return decode_write_verifier(xdr, &res->verf->verifier);
5353 out_overflow:
5354         print_overflow_msg(__func__, xdr);
5355         return -EIO;
5356 }
5357 
5358 static int decode_delegreturn(struct xdr_stream *xdr)
5359 {
5360         return decode_op_hdr(xdr, OP_DELEGRETURN);
5361 }
5362 
5363 static int decode_secinfo_gss(struct xdr_stream *xdr,
5364                               struct nfs4_secinfo4 *flavor)
5365 {
5366         u32 oid_len;
5367         __be32 *p;
5368 
5369         p = xdr_inline_decode(xdr, 4);
5370         if (unlikely(!p))
5371                 goto out_overflow;
5372         oid_len = be32_to_cpup(p);
5373         if (oid_len > GSS_OID_MAX_LEN)
5374                 goto out_err;
5375 
5376         p = xdr_inline_decode(xdr, oid_len);
5377         if (unlikely(!p))
5378                 goto out_overflow;
5379         memcpy(flavor->flavor_info.oid.data, p, oid_len);
5380         flavor->flavor_info.oid.len = oid_len;
5381 
5382         p = xdr_inline_decode(xdr, 8);
5383         if (unlikely(!p))
5384                 goto out_overflow;
5385         flavor->flavor_info.qop = be32_to_cpup(p++);
5386         flavor->flavor_info.service = be32_to_cpup(p);
5387 
5388         return 0;
5389 
5390 out_overflow:
5391         print_overflow_msg(__func__, xdr);
5392         return -EIO;
5393 out_err:
5394         return -EINVAL;
5395 }
5396 
5397 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5398 {
5399         struct nfs4_secinfo4 *sec_flavor;
5400         unsigned int i, num_flavors;
5401         int status;
5402         __be32 *p;
5403 
5404         p = xdr_inline_decode(xdr, 4);
5405         if (unlikely(!p))
5406                 goto out_overflow;
5407 
5408         res->flavors->num_flavors = 0;
5409         num_flavors = be32_to_cpup(p);
5410 
5411         for (i = 0; i < num_flavors; i++) {
5412                 sec_flavor = &res->flavors->flavors[i];
5413                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5414                         break;
5415 
5416                 p = xdr_inline_decode(xdr, 4);
5417                 if (unlikely(!p))
5418                         goto out_overflow;
5419                 sec_flavor->flavor = be32_to_cpup(p);
5420 
5421                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5422                         status = decode_secinfo_gss(xdr, sec_flavor);
5423                         if (status)
5424                                 goto out;
5425                 }
5426                 res->flavors->num_flavors++;
5427         }
5428 
5429         status = 0;
5430 out:
5431         return status;
5432 out_overflow:
5433         print_overflow_msg(__func__, xdr);
5434         return -EIO;
5435 }
5436 
5437 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5438 {
5439         int status = decode_op_hdr(xdr, OP_SECINFO);
5440         if (status)
5441                 return status;
5442         return decode_secinfo_common(xdr, res);
5443 }
5444 
5445 #if defined(CONFIG_NFS_V4_1)
5446 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5447 {
5448         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5449         if (status)
5450                 return status;
5451         return decode_secinfo_common(xdr, res);
5452 }
5453 
5454 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5455 {
5456         __be32 *p;
5457         uint32_t bitmap_words;
5458         unsigned int i;
5459 
5460         p = xdr_inline_decode(xdr, 4);
5461         bitmap_words = be32_to_cpup(p++);
5462         if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5463                 return -EIO;
5464         p = xdr_inline_decode(xdr, 4 * bitmap_words);
5465         for (i = 0; i < bitmap_words; i++)
5466                 op_map->u.words[i] = be32_to_cpup(p++);
5467 
5468         return 0;
5469 }
5470 
5471 static int decode_exchange_id(struct xdr_stream *xdr,
5472                               struct nfs41_exchange_id_res *res)
5473 {
5474         __be32 *p;
5475         uint32_t dummy;
5476         char *dummy_str;
5477         int status;
5478         uint32_t impl_id_count;
5479 
5480         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5481         if (status)
5482                 return status;
5483 
5484         p = xdr_inline_decode(xdr, 8);
5485         if (unlikely(!p))
5486                 goto out_overflow;
5487         xdr_decode_hyper(p, &res->clientid);
5488         p = xdr_inline_decode(xdr, 12);
5489         if (unlikely(!p))
5490                 goto out_overflow;
5491         res->seqid = be32_to_cpup(p++);
5492         res->flags = be32_to_cpup(p++);
5493 
5494         res->state_protect.how = be32_to_cpup(p);
5495         switch (res->state_protect.how) {
5496         case SP4_NONE:
5497                 break;
5498         case SP4_MACH_CRED:
5499                 status = decode_op_map(xdr, &res->state_protect.enforce);
5500                 if (status)
5501                         return status;
5502                 status = decode_op_map(xdr, &res->state_protect.allow);
5503                 if (status)
5504                         return status;
5505                 break;
5506         default:
5507                 WARN_ON_ONCE(1);
5508                 return -EIO;
5509         }
5510 
5511         /* server_owner4.so_minor_id */
5512         p = xdr_inline_decode(xdr, 8);
5513         if (unlikely(!p))
5514                 goto out_overflow;
5515         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5516 
5517         /* server_owner4.so_major_id */
5518         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5519         if (unlikely(status))
5520                 return status;
5521         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5522                 return -EIO;
5523         memcpy(res->server_owner->major_id, dummy_str, dummy);
5524         res->server_owner->major_id_sz = dummy;
5525 
5526         /* server_scope4 */
5527         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5528         if (unlikely(status))
5529                 return status;
5530         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5531                 return -EIO;
5532         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5533         res->server_scope->server_scope_sz = dummy;
5534 
5535         /* Implementation Id */
5536         p = xdr_inline_decode(xdr, 4);
5537         if (unlikely(!p))
5538                 goto out_overflow;
5539         impl_id_count = be32_to_cpup(p++);
5540 
5541         if (impl_id_count) {
5542                 /* nii_domain */
5543                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5544                 if (unlikely(status))
5545                         return status;
5546                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5547                         return -EIO;
5548                 memcpy(res->impl_id->domain, dummy_str, dummy);
5549 
5550                 /* nii_name */
5551                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5552                 if (unlikely(status))
5553                         return status;
5554                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5555                         return -EIO;
5556                 memcpy(res->impl_id->name, dummy_str, dummy);
5557 
5558                 /* nii_date */
5559                 p = xdr_inline_decode(xdr, 12);
5560                 if (unlikely(!p))
5561                         goto out_overflow;
5562                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5563                 res->impl_id->date.nseconds = be32_to_cpup(p);
5564 
5565                 /* if there's more than one entry, ignore the rest */
5566         }
5567         return 0;
5568 out_overflow:
5569         print_overflow_msg(__func__, xdr);
5570         return -EIO;
5571 }
5572 
5573 static int decode_chan_attrs(struct xdr_stream *xdr,
5574                              struct nfs4_channel_attrs *attrs)
5575 {
5576         __be32 *p;
5577         u32 nr_attrs, val;
5578 
5579         p = xdr_inline_decode(xdr, 28);
5580         if (unlikely(!p))
5581                 goto out_overflow;
5582         val = be32_to_cpup(p++);        /* headerpadsz */
5583         if (val)
5584                 return -EINVAL;         /* no support for header padding yet */
5585         attrs->max_rqst_sz = be32_to_cpup(p++);
5586         attrs->max_resp_sz = be32_to_cpup(p++);
5587         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5588         attrs->max_ops = be32_to_cpup(p++);
5589         attrs->max_reqs = be32_to_cpup(p++);
5590         nr_attrs = be32_to_cpup(p);
5591         if (unlikely(nr_attrs > 1)) {
5592                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5593                         "count %u\n", __func__, nr_attrs);
5594                 return -EINVAL;
5595         }
5596         if (nr_attrs == 1) {
5597                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5598                 if (unlikely(!p))
5599                         goto out_overflow;
5600         }
5601         return 0;
5602 out_overflow:
5603         print_overflow_msg(__func__, xdr);
5604         return -EIO;
5605 }
5606 
5607 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5608 {
5609         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5610 }
5611 
5612 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5613                                 struct nfs41_bind_conn_to_session_res *res)
5614 {
5615         __be32 *p;
5616         int status;
5617 
5618         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5619         if (!status)
5620                 status = decode_sessionid(xdr, &res->sessionid);
5621         if (unlikely(status))
5622                 return status;
5623 
5624         /* dir flags, rdma mode bool */
5625         p = xdr_inline_decode(xdr, 8);
5626         if (unlikely(!p))
5627                 goto out_overflow;
5628 
5629         res->dir = be32_to_cpup(p++);
5630         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5631                 return -EIO;
5632         if (be32_to_cpup(p) == 0)
5633                 res->use_conn_in_rdma_mode = false;
5634         else
5635                 res->use_conn_in_rdma_mode = true;
5636 
5637         return 0;
5638 out_overflow:
5639         print_overflow_msg(__func__, xdr);
5640         return -EIO;
5641 }
5642 
5643 static int decode_create_session(struct xdr_stream *xdr,
5644                                  struct nfs41_create_session_res *res)
5645 {
5646         __be32 *p;
5647         int status;
5648 
5649         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5650         if (!status)
5651                 status = decode_sessionid(xdr, &res->sessionid);
5652         if (unlikely(status))
5653                 return status;
5654 
5655         /* seqid, flags */
5656         p = xdr_inline_decode(xdr, 8);
5657         if (unlikely(!p))
5658                 goto out_overflow;
5659         res->seqid = be32_to_cpup(p++);
5660         res->flags = be32_to_cpup(p);
5661 
5662         /* Channel attributes */
5663         status = decode_chan_attrs(xdr, &res->fc_attrs);
5664         if (!status)
5665                 status = decode_chan_attrs(xdr, &res->bc_attrs);
5666         return status;
5667 out_overflow:
5668         print_overflow_msg(__func__, xdr);
5669         return -EIO;
5670 }
5671 
5672 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5673 {
5674         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5675 }
5676 
5677 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5678 {
5679         return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5680 }
5681 
5682 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5683 {
5684         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5685 }
5686 #endif /* CONFIG_NFS_V4_1 */
5687 
5688 static int decode_sequence(struct xdr_stream *xdr,
5689                            struct nfs4_sequence_res *res,
5690                            struct rpc_rqst *rqstp)
5691 {
5692 #if defined(CONFIG_NFS_V4_1)
5693         struct nfs4_session *session;
5694         struct nfs4_sessionid id;
5695         u32 dummy;
5696         int status;
5697         __be32 *p;
5698 
5699         if (res->sr_slot == NULL)
5700                 return 0;
5701         if (!res->sr_slot->table->session)
5702                 return 0;
5703 
5704         status = decode_op_hdr(xdr, OP_SEQUENCE);
5705         if (!status)
5706                 status = decode_sessionid(xdr, &id);
5707         if (unlikely(status))
5708                 goto out_err;
5709 
5710         /*
5711          * If the server returns different values for sessionID, slotID or
5712          * sequence number, the server is looney tunes.
5713          */
5714         status = -EREMOTEIO;
5715         session = res->sr_slot->table->session;
5716 
5717         if (memcmp(id.data, session->sess_id.data,
5718                    NFS4_MAX_SESSIONID_LEN)) {
5719                 dprintk("%s Invalid session id\n", __func__);
5720                 goto out_err;
5721         }
5722 
5723         p = xdr_inline_decode(xdr, 20);
5724         if (unlikely(!p))
5725                 goto out_overflow;
5726 
5727         /* seqid */
5728         dummy = be32_to_cpup(p++);
5729         if (dummy != res->sr_slot->seq_nr) {
5730                 dprintk("%s Invalid sequence number\n", __func__);
5731                 goto out_err;
5732         }
5733         /* slot id */
5734         dummy = be32_to_cpup(p++);
5735         if (dummy != res->sr_slot->slot_nr) {
5736                 dprintk("%s Invalid slot id\n", __func__);
5737                 goto out_err;
5738         }
5739         /* highest slot id */
5740         res->sr_highest_slotid = be32_to_cpup(p++);
5741         /* target highest slot id */
5742         res->sr_target_highest_slotid = be32_to_cpup(p++);
5743         /* result flags */
5744         res->sr_status_flags = be32_to_cpup(p);
5745         status = 0;
5746 out_err:
5747         res->sr_status = status;
5748         return status;
5749 out_overflow:
5750         print_overflow_msg(__func__, xdr);
5751         status = -EIO;
5752         goto out_err;
5753 #else  /* CONFIG_NFS_V4_1 */
5754         return 0;
5755 #endif /* CONFIG_NFS_V4_1 */
5756 }
5757 
5758 #if defined(CONFIG_NFS_V4_1)
5759 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5760                                 struct nfs4_getdeviceinfo_res *res)
5761 {
5762         struct pnfs_device *pdev = res->pdev;
5763         __be32 *p;
5764         uint32_t len, type;
5765         int status;