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

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  1 /*
  2  *  fs/nfs/nfs4xdr.c
  3  *
  4  *  Client-side XDR for NFSv4.
  5  *
  6  *  Copyright (c) 2002 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Kendrick Smith <kmsmith@umich.edu>
 10  *  Andy Adamson   <andros@umich.edu>
 11  *
 12  *  Redistribution and use in source and binary forms, with or without
 13  *  modification, are permitted provided that the following conditions
 14  *  are met:
 15  *
 16  *  1. Redistributions of source code must retain the above copyright
 17  *     notice, this list of conditions and the following disclaimer.
 18  *  2. Redistributions in binary form must reproduce the above copyright
 19  *     notice, this list of conditions and the following disclaimer in the
 20  *     documentation and/or other materials provided with the distribution.
 21  *  3. Neither the name of the University nor the names of its
 22  *     contributors may be used to endorse or promote products derived
 23  *     from this software without specific prior written permission.
 24  *
 25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 36  */
 37 
 38 #include <linux/param.h>
 39 #include <linux/time.h>
 40 #include <linux/mm.h>
 41 #include <linux/errno.h>
 42 #include <linux/string.h>
 43 #include <linux/in.h>
 44 #include <linux/pagemap.h>
 45 #include <linux/proc_fs.h>
 46 #include <linux/kdev_t.h>
 47 #include <linux/module.h>
 48 #include <linux/utsname.h>
 49 #include <linux/sunrpc/clnt.h>
 50 #include <linux/sunrpc/msg_prot.h>
 51 #include <linux/sunrpc/gss_api.h>
 52 #include <linux/nfs.h>
 53 #include <linux/nfs4.h>
 54 #include <linux/nfs_fs.h>
 55 #include <linux/nfs_idmap.h>
 56 
 57 #include "nfs4_fs.h"
 58 #include "internal.h"
 59 #include "nfs4session.h"
 60 #include "pnfs.h"
 61 #include "netns.h"
 62 
 63 #define NFSDBG_FACILITY         NFSDBG_XDR
 64 
 65 /* Mapping from NFS error code to "errno" error code. */
 66 #define errno_NFSERR_IO         EIO
 67 
 68 static int nfs4_stat_to_errno(int);
 69 
 70 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
 71 #ifdef DEBUG
 72 #define NFS4_MAXTAGLEN          20
 73 #else
 74 #define NFS4_MAXTAGLEN          0
 75 #endif
 76 
 77 /* lock,open owner id:
 78  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
 79  */
 80 #define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
 81 #define lock_owner_id_maxsz     (1 + 1 + 4)
 82 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 83 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 84 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 85 #define op_encode_hdr_maxsz     (1)
 86 #define op_decode_hdr_maxsz     (2)
 87 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 88 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 89 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 90 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 91 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
 92                                 (NFS4_FHSIZE >> 2))
 93 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
 94 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
 95 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
 96 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
 97 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
 98                                 ((3+NFS4_FHSIZE) >> 2))
 99 #define nfs4_fattr_bitmap_maxsz 4
100 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
101 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
102 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
103 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
104 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
105 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
106 /* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
107 #define nfs4_label_maxsz        (4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
108 #else
109 #define nfs4_label_maxsz        0
110 #endif
111 /* We support only one layout type per file system */
112 #define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
113 /* This is based on getfattr, which uses the most attributes: */
114 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
115                                 3 + 3 + 3 + nfs4_owner_maxsz + \
116                                 nfs4_group_maxsz + nfs4_label_maxsz + \
117                                  decode_mdsthreshold_maxsz))
118 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
119                                 nfs4_fattr_value_maxsz)
120 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
121 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
122                                  1 + 2 + 1 + \
123                                 nfs4_owner_maxsz + \
124                                 nfs4_group_maxsz + \
125                                 nfs4_label_maxsz + \
126                                 4 + 4)
127 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
128 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
129 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
130 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
131 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
132 /* The 5 accounts for the PNFS attributes, and assumes that at most three
133  * layout types will be returned.
134  */
135 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
136                                  nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
137 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
138 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
139 #define encode_setclientid_maxsz \
140                                 (op_encode_hdr_maxsz + \
141                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
142                                 XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
143                                 1 /* sc_prog */ + \
144                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
145                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
146                                 1) /* sc_cb_ident */
147 #define decode_setclientid_maxsz \
148                                 (op_decode_hdr_maxsz + \
149                                 2 /* clientid */ + \
150                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
151                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
152                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
153 #define encode_setclientid_confirm_maxsz \
154                                 (op_encode_hdr_maxsz + \
155                                 3 + (NFS4_VERIFIER_SIZE >> 2))
156 #define decode_setclientid_confirm_maxsz \
157                                 (op_decode_hdr_maxsz)
158 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
159 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
160 #define encode_share_access_maxsz \
161                                 (2)
162 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
163 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
164 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
165 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
166                                 2 + encode_share_access_maxsz + 2 + \
167                                 open_owner_id_maxsz + \
168                                 encode_opentype_maxsz + \
169                                 encode_claim_null_maxsz)
170 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
171 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
172                                 decode_ace_maxsz)
173 #define decode_change_info_maxsz        (5)
174 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
175                                 decode_stateid_maxsz + \
176                                 decode_change_info_maxsz + 1 + \
177                                 nfs4_fattr_bitmap_maxsz + \
178                                 decode_delegation_maxsz)
179 #define encode_open_confirm_maxsz \
180                                 (op_encode_hdr_maxsz + \
181                                  encode_stateid_maxsz + 1)
182 #define decode_open_confirm_maxsz \
183                                 (op_decode_hdr_maxsz + \
184                                  decode_stateid_maxsz)
185 #define encode_open_downgrade_maxsz \
186                                 (op_encode_hdr_maxsz + \
187                                  encode_stateid_maxsz + 1 + \
188                                  encode_share_access_maxsz)
189 #define decode_open_downgrade_maxsz \
190                                 (op_decode_hdr_maxsz + \
191                                  decode_stateid_maxsz)
192 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
193                                  1 + encode_stateid_maxsz)
194 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
195                                  decode_stateid_maxsz)
196 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
197                                  encode_stateid_maxsz + \
198                                  encode_attrs_maxsz)
199 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
200                                  nfs4_fattr_bitmap_maxsz)
201 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
202                                  encode_stateid_maxsz + 3)
203 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
204 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
205                                  2 + encode_verifier_maxsz + 5 + \
206                                 nfs4_label_maxsz)
207 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
208                                  decode_verifier_maxsz)
209 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
210 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
211 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
212                                  encode_stateid_maxsz + 4)
213 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
214                                  2 + decode_verifier_maxsz)
215 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
216 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
217                                  decode_verifier_maxsz)
218 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
219                                 nfs4_name_maxsz)
220 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
221                                  decode_change_info_maxsz)
222 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
223                                 2 * nfs4_name_maxsz)
224 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
225                                  decode_change_info_maxsz + \
226                                  decode_change_info_maxsz)
227 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
228                                 nfs4_name_maxsz)
229 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
230 #define encode_lockowner_maxsz  (7)
231 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
232                                  7 + \
233                                  1 + encode_stateid_maxsz + 1 + \
234                                  encode_lockowner_maxsz)
235 #define decode_lock_denied_maxsz \
236                                 (8 + decode_lockowner_maxsz)
237 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
238                                  decode_lock_denied_maxsz)
239 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
240                                 encode_lockowner_maxsz)
241 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
242                                  decode_lock_denied_maxsz)
243 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
244                                  encode_stateid_maxsz + \
245                                  4)
246 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
247                                  decode_stateid_maxsz)
248 #define encode_release_lockowner_maxsz \
249                                 (op_encode_hdr_maxsz + \
250                                  encode_lockowner_maxsz)
251 #define decode_release_lockowner_maxsz \
252                                 (op_decode_hdr_maxsz)
253 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
254 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
255 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
256                                 1 + nfs4_name_maxsz + \
257                                 1 + \
258                                 nfs4_fattr_maxsz)
259 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
260 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
261                                 1 + 2 + nfs4_name_maxsz + \
262                                 encode_attrs_maxsz)
263 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
264                                 decode_change_info_maxsz + \
265                                 nfs4_fattr_bitmap_maxsz)
266 #define encode_statfs_maxsz     (encode_getattr_maxsz)
267 #define decode_statfs_maxsz     (decode_getattr_maxsz)
268 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
269 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
270 #define encode_getacl_maxsz     (encode_getattr_maxsz)
271 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
272                                  nfs4_fattr_bitmap_maxsz + 1)
273 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
274                                  encode_stateid_maxsz + 3)
275 #define decode_setacl_maxsz     (decode_setattr_maxsz)
276 #define encode_fs_locations_maxsz \
277                                 (encode_getattr_maxsz)
278 #define decode_fs_locations_maxsz \
279                                 (0)
280 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
281 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
282 
283 #if defined(CONFIG_NFS_V4_1)
284 #define NFS4_MAX_MACHINE_NAME_LEN (64)
285 #define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
286                          sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
287 
288 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
289                                 encode_verifier_maxsz + \
290                                 1 /* co_ownerid.len */ + \
291                                 XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
292                                 1 /* flags */ + \
293                                 1 /* spa_how */ + \
294                                 /* max is SP4_MACH_CRED (for now) */ + \
295                                 1 + NFS4_OP_MAP_NUM_WORDS + \
296                                 1 + NFS4_OP_MAP_NUM_WORDS + \
297                                 1 /* implementation id array of size 1 */ + \
298                                 1 /* nii_domain */ + \
299                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
300                                 1 /* nii_name */ + \
301                                 XDR_QUADLEN(IMPL_NAME_LIMIT) + \
302                                 3 /* nii_date */)
303 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
304                                 2 /* eir_clientid */ + \
305                                 1 /* eir_sequenceid */ + \
306                                 1 /* eir_flags */ + \
307                                 1 /* spr_how */ + \
308                                   /* max is SP4_MACH_CRED (for now) */ + \
309                                 1 + NFS4_OP_MAP_NUM_WORDS + \
310                                 1 + NFS4_OP_MAP_NUM_WORDS + \
311                                 2 /* eir_server_owner.so_minor_id */ + \
312                                 /* eir_server_owner.so_major_id<> */ \
313                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
314                                 /* eir_server_scope<> */ \
315                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
316                                 1 /* eir_server_impl_id array length */ + \
317                                 1 /* nii_domain */ + \
318                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
319                                 1 /* nii_name */ + \
320                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
321                                 3 /* nii_date */)
322 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
323 #define decode_channel_attrs_maxsz  (6 + \
324                                      1 /* ca_rdma_ird.len */ + \
325                                      1 /* ca_rdma_ird */)
326 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
327                                      2 /* csa_clientid */ + \
328                                      1 /* csa_sequence */ + \
329                                      1 /* csa_flags */ + \
330                                      encode_channel_attrs_maxsz + \
331                                      encode_channel_attrs_maxsz + \
332                                      1 /* csa_cb_program */ + \
333                                      1 /* csa_sec_parms.len (1) */ + \
334                                      1 /* cb_secflavor (AUTH_SYS) */ + \
335                                      1 /* stamp */ + \
336                                      1 /* machinename.len */ + \
337                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
338                                      1 /* uid */ + \
339                                      1 /* gid */ + \
340                                      1 /* gids.len (0) */)
341 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
342                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
343                                      1 /* csr_sequence */ + \
344                                      1 /* csr_flags */ + \
345                                      decode_channel_attrs_maxsz + \
346                                      decode_channel_attrs_maxsz)
347 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
348                                      /* bctsa_sessid */ \
349                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
350                                      1 /* bctsa_dir */ + \
351                                      1 /* bctsa_use_conn_in_rdma_mode */)
352 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
353                                      /* bctsr_sessid */ \
354                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
355                                      1 /* bctsr_dir */ + \
356                                      1 /* bctsr_use_conn_in_rdma_mode */)
357 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
358 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
359 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
360 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
361 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
362                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
363 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
364                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
365 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
366 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
367 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
368                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
369                                 1 /* layout type */ + \
370                                 1 /* maxcount */ + \
371                                 1 /* bitmap size */ + \
372                                 1 /* notification bitmap length */ + \
373                                 1 /* notification bitmap, word 0 */)
374 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
375                                 1 /* layout type */ + \
376                                 1 /* opaque devaddr4 length */ + \
377                                   /* devaddr4 payload is read into page */ \
378                                 1 /* notification bitmap length */ + \
379                                 1 /* notification bitmap, word 0 */)
380 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
381                                 encode_stateid_maxsz)
382 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
383                                 decode_stateid_maxsz + \
384                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
385 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
386                                 2 /* offset */ + \
387                                 2 /* length */ + \
388                                 1 /* reclaim */ + \
389                                 encode_stateid_maxsz + \
390                                 1 /* new offset (true) */ + \
391                                 2 /* last byte written */ + \
392                                 1 /* nt_timechanged (false) */ + \
393                                 1 /* layoutupdate4 layout type */ + \
394                                 1 /* layoutupdate4 opaqueue len */)
395                                   /* the actual content of layoutupdate4 should
396                                      be allocated by drivers and spliced in
397                                      using xdr_write_pages */
398 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
399 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
400                                 encode_stateid_maxsz + \
401                                 1 /* FIXME: opaque lrf_body always empty at the moment */)
402 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
403                                 1 + decode_stateid_maxsz)
404 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
405 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
406 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
407                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
408 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
409 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
410                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
411 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz)
412 #else /* CONFIG_NFS_V4_1 */
413 #define encode_sequence_maxsz   0
414 #define decode_sequence_maxsz   0
415 #endif /* CONFIG_NFS_V4_1 */
416 
417 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
418 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
419 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
420                                 encode_sequence_maxsz + \
421                                 encode_putfh_maxsz + \
422                                 encode_read_maxsz)
423 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
424                                 decode_sequence_maxsz + \
425                                 decode_putfh_maxsz + \
426                                 decode_read_maxsz)
427 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
428                                 encode_sequence_maxsz + \
429                                 encode_putfh_maxsz + \
430                                 encode_readlink_maxsz)
431 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
432                                 decode_sequence_maxsz + \
433                                 decode_putfh_maxsz + \
434                                 decode_readlink_maxsz)
435 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
436                                 encode_sequence_maxsz + \
437                                 encode_putfh_maxsz + \
438                                 encode_readdir_maxsz)
439 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
440                                 decode_sequence_maxsz + \
441                                 decode_putfh_maxsz + \
442                                 decode_readdir_maxsz)
443 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
444                                 encode_sequence_maxsz + \
445                                 encode_putfh_maxsz + \
446                                 encode_write_maxsz + \
447                                 encode_getattr_maxsz)
448 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
449                                 decode_sequence_maxsz + \
450                                 decode_putfh_maxsz + \
451                                 decode_write_maxsz + \
452                                 decode_getattr_maxsz)
453 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
454                                 encode_sequence_maxsz + \
455                                 encode_putfh_maxsz + \
456                                 encode_commit_maxsz)
457 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
458                                 decode_sequence_maxsz + \
459                                 decode_putfh_maxsz + \
460                                 decode_commit_maxsz)
461 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
462                                 encode_sequence_maxsz + \
463                                 encode_putfh_maxsz + \
464                                 encode_open_maxsz + \
465                                 encode_access_maxsz + \
466                                 encode_getfh_maxsz + \
467                                 encode_getattr_maxsz)
468 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
469                                 decode_sequence_maxsz + \
470                                 decode_putfh_maxsz + \
471                                 decode_open_maxsz + \
472                                 decode_access_maxsz + \
473                                 decode_getfh_maxsz + \
474                                 decode_getattr_maxsz)
475 #define NFS4_enc_open_confirm_sz \
476                                 (compound_encode_hdr_maxsz + \
477                                  encode_putfh_maxsz + \
478                                  encode_open_confirm_maxsz)
479 #define NFS4_dec_open_confirm_sz \
480                                 (compound_decode_hdr_maxsz + \
481                                  decode_putfh_maxsz + \
482                                  decode_open_confirm_maxsz)
483 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
484                                         encode_sequence_maxsz + \
485                                         encode_putfh_maxsz + \
486                                         encode_open_maxsz + \
487                                         encode_access_maxsz + \
488                                         encode_getattr_maxsz)
489 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
490                                         decode_sequence_maxsz + \
491                                         decode_putfh_maxsz + \
492                                         decode_open_maxsz + \
493                                         decode_access_maxsz + \
494                                         decode_getattr_maxsz)
495 #define NFS4_enc_open_downgrade_sz \
496                                 (compound_encode_hdr_maxsz + \
497                                  encode_sequence_maxsz + \
498                                  encode_putfh_maxsz + \
499                                  encode_open_downgrade_maxsz + \
500                                  encode_getattr_maxsz)
501 #define NFS4_dec_open_downgrade_sz \
502                                 (compound_decode_hdr_maxsz + \
503                                  decode_sequence_maxsz + \
504                                  decode_putfh_maxsz + \
505                                  decode_open_downgrade_maxsz + \
506                                  decode_getattr_maxsz)
507 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
508                                  encode_sequence_maxsz + \
509                                  encode_putfh_maxsz + \
510                                  encode_close_maxsz + \
511                                  encode_getattr_maxsz)
512 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
513                                  decode_sequence_maxsz + \
514                                  decode_putfh_maxsz + \
515                                  decode_close_maxsz + \
516                                  decode_getattr_maxsz)
517 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
518                                  encode_sequence_maxsz + \
519                                  encode_putfh_maxsz + \
520                                  encode_setattr_maxsz + \
521                                  encode_getattr_maxsz)
522 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
523                                  decode_sequence_maxsz + \
524                                  decode_putfh_maxsz + \
525                                  decode_setattr_maxsz + \
526                                  decode_getattr_maxsz)
527 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
528                                 encode_sequence_maxsz + \
529                                 encode_putfh_maxsz + \
530                                 encode_fsinfo_maxsz)
531 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
532                                 decode_sequence_maxsz + \
533                                 decode_putfh_maxsz + \
534                                 decode_fsinfo_maxsz)
535 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
536                                 encode_renew_maxsz)
537 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
538                                 decode_renew_maxsz)
539 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
540                                 encode_setclientid_maxsz)
541 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
542                                 decode_setclientid_maxsz)
543 #define NFS4_enc_setclientid_confirm_sz \
544                                 (compound_encode_hdr_maxsz + \
545                                 encode_setclientid_confirm_maxsz)
546 #define NFS4_dec_setclientid_confirm_sz \
547                                 (compound_decode_hdr_maxsz + \
548                                 decode_setclientid_confirm_maxsz)
549 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
550                                 encode_sequence_maxsz + \
551                                 encode_putfh_maxsz + \
552                                 encode_lock_maxsz)
553 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
554                                 decode_sequence_maxsz + \
555                                 decode_putfh_maxsz + \
556                                 decode_lock_maxsz)
557 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
558                                 encode_sequence_maxsz + \
559                                 encode_putfh_maxsz + \
560                                 encode_lockt_maxsz)
561 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
562                                  decode_sequence_maxsz + \
563                                  decode_putfh_maxsz + \
564                                  decode_lockt_maxsz)
565 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
566                                 encode_sequence_maxsz + \
567                                 encode_putfh_maxsz + \
568                                 encode_locku_maxsz)
569 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
570                                 decode_sequence_maxsz + \
571                                 decode_putfh_maxsz + \
572                                 decode_locku_maxsz)
573 #define NFS4_enc_release_lockowner_sz \
574                                 (compound_encode_hdr_maxsz + \
575                                  encode_lockowner_maxsz)
576 #define NFS4_dec_release_lockowner_sz \
577                                 (compound_decode_hdr_maxsz + \
578                                  decode_lockowner_maxsz)
579 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
580                                 encode_sequence_maxsz + \
581                                 encode_putfh_maxsz + \
582                                 encode_access_maxsz + \
583                                 encode_getattr_maxsz)
584 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
585                                 decode_sequence_maxsz + \
586                                 decode_putfh_maxsz + \
587                                 decode_access_maxsz + \
588                                 decode_getattr_maxsz)
589 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
590                                 encode_sequence_maxsz + \
591                                 encode_putfh_maxsz + \
592                                 encode_getattr_maxsz + \
593                                 encode_renew_maxsz)
594 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
595                                 decode_sequence_maxsz + \
596                                 decode_putfh_maxsz + \
597                                 decode_getattr_maxsz + \
598                                 decode_renew_maxsz)
599 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
600                                 encode_sequence_maxsz + \
601                                 encode_putfh_maxsz + \
602                                 encode_lookup_maxsz + \
603                                 encode_getattr_maxsz + \
604                                 encode_getfh_maxsz)
605 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
606                                 decode_sequence_maxsz + \
607                                 decode_putfh_maxsz + \
608                                 decode_lookup_maxsz + \
609                                 decode_getattr_maxsz + \
610                                 decode_getfh_maxsz)
611 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
612                                 encode_sequence_maxsz + \
613                                 encode_putrootfh_maxsz + \
614                                 encode_getattr_maxsz + \
615                                 encode_getfh_maxsz)
616 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
617                                 decode_sequence_maxsz + \
618                                 decode_putrootfh_maxsz + \
619                                 decode_getattr_maxsz + \
620                                 decode_getfh_maxsz)
621 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
622                                 encode_sequence_maxsz + \
623                                 encode_putfh_maxsz + \
624                                 encode_remove_maxsz)
625 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
626                                 decode_sequence_maxsz + \
627                                 decode_putfh_maxsz + \
628                                 decode_remove_maxsz)
629 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
630                                 encode_sequence_maxsz + \
631                                 encode_putfh_maxsz + \
632                                 encode_savefh_maxsz + \
633                                 encode_putfh_maxsz + \
634                                 encode_rename_maxsz)
635 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
636                                 decode_sequence_maxsz + \
637                                 decode_putfh_maxsz + \
638                                 decode_savefh_maxsz + \
639                                 decode_putfh_maxsz + \
640                                 decode_rename_maxsz)
641 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
642                                 encode_sequence_maxsz + \
643                                 encode_putfh_maxsz + \
644                                 encode_savefh_maxsz + \
645                                 encode_putfh_maxsz + \
646                                 encode_link_maxsz + \
647                                 encode_restorefh_maxsz + \
648                                 encode_getattr_maxsz)
649 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
650                                 decode_sequence_maxsz + \
651                                 decode_putfh_maxsz + \
652                                 decode_savefh_maxsz + \
653                                 decode_putfh_maxsz + \
654                                 decode_link_maxsz + \
655                                 decode_restorefh_maxsz + \
656                                 decode_getattr_maxsz)
657 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
658                                 encode_sequence_maxsz + \
659                                 encode_putfh_maxsz + \
660                                 encode_symlink_maxsz + \
661                                 encode_getattr_maxsz + \
662                                 encode_getfh_maxsz)
663 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
664                                 decode_sequence_maxsz + \
665                                 decode_putfh_maxsz + \
666                                 decode_symlink_maxsz + \
667                                 decode_getattr_maxsz + \
668                                 decode_getfh_maxsz)
669 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
670                                 encode_sequence_maxsz + \
671                                 encode_putfh_maxsz + \
672                                 encode_create_maxsz + \
673                                 encode_getfh_maxsz + \
674                                 encode_getattr_maxsz)
675 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
676                                 decode_sequence_maxsz + \
677                                 decode_putfh_maxsz + \
678                                 decode_create_maxsz + \
679                                 decode_getfh_maxsz + \
680                                 decode_getattr_maxsz)
681 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
682                                 encode_sequence_maxsz + \
683                                 encode_putfh_maxsz + \
684                                 encode_getattr_maxsz)
685 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
686                                 decode_sequence_maxsz + \
687                                 decode_putfh_maxsz + \
688                                 decode_getattr_maxsz)
689 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
690                                 encode_sequence_maxsz + \
691                                 encode_putfh_maxsz + \
692                                 encode_statfs_maxsz)
693 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
694                                 decode_sequence_maxsz + \
695                                 decode_putfh_maxsz + \
696                                 decode_statfs_maxsz)
697 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
698                                 encode_sequence_maxsz + \
699                                 encode_putfh_maxsz + \
700                                 encode_getattr_maxsz)
701 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
702                                 decode_sequence_maxsz + \
703                                 decode_putfh_maxsz + \
704                                 decode_getattr_maxsz)
705 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
706                                 encode_sequence_maxsz + \
707                                 encode_putfh_maxsz + \
708                                 encode_delegreturn_maxsz + \
709                                 encode_getattr_maxsz)
710 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
711                                 decode_sequence_maxsz + \
712                                 decode_delegreturn_maxsz + \
713                                 decode_getattr_maxsz)
714 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
715                                 encode_sequence_maxsz + \
716                                 encode_putfh_maxsz + \
717                                 encode_getacl_maxsz)
718 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
719                                 decode_sequence_maxsz + \
720                                 decode_putfh_maxsz + \
721                                 decode_getacl_maxsz)
722 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
723                                 encode_sequence_maxsz + \
724                                 encode_putfh_maxsz + \
725                                 encode_setacl_maxsz)
726 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
727                                 decode_sequence_maxsz + \
728                                 decode_putfh_maxsz + \
729                                 decode_setacl_maxsz)
730 #define NFS4_enc_fs_locations_sz \
731                                 (compound_encode_hdr_maxsz + \
732                                  encode_sequence_maxsz + \
733                                  encode_putfh_maxsz + \
734                                  encode_lookup_maxsz + \
735                                  encode_fs_locations_maxsz + \
736                                  encode_renew_maxsz)
737 #define NFS4_dec_fs_locations_sz \
738                                 (compound_decode_hdr_maxsz + \
739                                  decode_sequence_maxsz + \
740                                  decode_putfh_maxsz + \
741                                  decode_lookup_maxsz + \
742                                  decode_fs_locations_maxsz + \
743                                  decode_renew_maxsz)
744 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
745                                 encode_sequence_maxsz + \
746                                 encode_putfh_maxsz + \
747                                 encode_secinfo_maxsz)
748 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
749                                 decode_sequence_maxsz + \
750                                 decode_putfh_maxsz + \
751                                 decode_secinfo_maxsz)
752 #define NFS4_enc_fsid_present_sz \
753                                 (compound_encode_hdr_maxsz + \
754                                  encode_sequence_maxsz + \
755                                  encode_putfh_maxsz + \
756                                  encode_getfh_maxsz + \
757                                  encode_renew_maxsz)
758 #define NFS4_dec_fsid_present_sz \
759                                 (compound_decode_hdr_maxsz + \
760                                  decode_sequence_maxsz + \
761                                  decode_putfh_maxsz + \
762                                  decode_getfh_maxsz + \
763                                  decode_renew_maxsz)
764 #if defined(CONFIG_NFS_V4_1)
765 #define NFS4_enc_bind_conn_to_session_sz \
766                                 (compound_encode_hdr_maxsz + \
767                                  encode_bind_conn_to_session_maxsz)
768 #define NFS4_dec_bind_conn_to_session_sz \
769                                 (compound_decode_hdr_maxsz + \
770                                  decode_bind_conn_to_session_maxsz)
771 #define NFS4_enc_exchange_id_sz \
772                                 (compound_encode_hdr_maxsz + \
773                                  encode_exchange_id_maxsz)
774 #define NFS4_dec_exchange_id_sz \
775                                 (compound_decode_hdr_maxsz + \
776                                  decode_exchange_id_maxsz)
777 #define NFS4_enc_create_session_sz \
778                                 (compound_encode_hdr_maxsz + \
779                                  encode_create_session_maxsz)
780 #define NFS4_dec_create_session_sz \
781                                 (compound_decode_hdr_maxsz + \
782                                  decode_create_session_maxsz)
783 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
784                                          encode_destroy_session_maxsz)
785 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
786                                          decode_destroy_session_maxsz)
787 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
788                                          encode_destroy_clientid_maxsz)
789 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
790                                          decode_destroy_clientid_maxsz)
791 #define NFS4_enc_sequence_sz \
792                                 (compound_decode_hdr_maxsz + \
793                                  encode_sequence_maxsz)
794 #define NFS4_dec_sequence_sz \
795                                 (compound_decode_hdr_maxsz + \
796                                  decode_sequence_maxsz)
797 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
798                                          encode_sequence_maxsz + \
799                                          encode_putrootfh_maxsz + \
800                                          encode_fsinfo_maxsz)
801 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
802                                          decode_sequence_maxsz + \
803                                          decode_putrootfh_maxsz + \
804                                          decode_fsinfo_maxsz)
805 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
806                                          encode_sequence_maxsz + \
807                                          encode_reclaim_complete_maxsz)
808 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
809                                          decode_sequence_maxsz + \
810                                          decode_reclaim_complete_maxsz)
811 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
812                                 encode_sequence_maxsz +\
813                                 encode_getdeviceinfo_maxsz)
814 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
815                                 decode_sequence_maxsz + \
816                                 decode_getdeviceinfo_maxsz)
817 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
818                                 encode_sequence_maxsz + \
819                                 encode_putfh_maxsz +        \
820                                 encode_layoutget_maxsz)
821 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
822                                 decode_sequence_maxsz + \
823                                 decode_putfh_maxsz +        \
824                                 decode_layoutget_maxsz)
825 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
826                                 encode_sequence_maxsz +\
827                                 encode_putfh_maxsz + \
828                                 encode_layoutcommit_maxsz + \
829                                 encode_getattr_maxsz)
830 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
831                                 decode_sequence_maxsz + \
832                                 decode_putfh_maxsz + \
833                                 decode_layoutcommit_maxsz + \
834                                 decode_getattr_maxsz)
835 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
836                                 encode_sequence_maxsz + \
837                                 encode_putfh_maxsz + \
838                                 encode_layoutreturn_maxsz)
839 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
840                                 decode_sequence_maxsz + \
841                                 decode_putfh_maxsz + \
842                                 decode_layoutreturn_maxsz)
843 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
844                                         encode_sequence_maxsz + \
845                                         encode_putrootfh_maxsz +\
846                                         encode_secinfo_no_name_maxsz)
847 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
848                                         decode_sequence_maxsz + \
849                                         decode_putrootfh_maxsz + \
850                                         decode_secinfo_no_name_maxsz)
851 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
852                                          encode_sequence_maxsz + \
853                                          encode_test_stateid_maxsz)
854 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
855                                          decode_sequence_maxsz + \
856                                          decode_test_stateid_maxsz)
857 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
858                                          encode_sequence_maxsz + \
859                                          encode_free_stateid_maxsz)
860 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
861                                          decode_sequence_maxsz + \
862                                          decode_free_stateid_maxsz)
863 
864 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
865                                       compound_encode_hdr_maxsz +
866                                       encode_sequence_maxsz +
867                                       encode_putfh_maxsz +
868                                       encode_getattr_maxsz) *
869                                      XDR_UNIT);
870 
871 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
872                                      compound_decode_hdr_maxsz +
873                                      decode_sequence_maxsz +
874                                      decode_putfh_maxsz) *
875                                     XDR_UNIT);
876 
877 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
878                                            compound_decode_hdr_maxsz +
879                                            decode_sequence_maxsz) *
880                                           XDR_UNIT);
881 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
882 #endif /* CONFIG_NFS_V4_1 */
883 
884 static const umode_t nfs_type2fmt[] = {
885         [NF4BAD] = 0,
886         [NF4REG] = S_IFREG,
887         [NF4DIR] = S_IFDIR,
888         [NF4BLK] = S_IFBLK,
889         [NF4CHR] = S_IFCHR,
890         [NF4LNK] = S_IFLNK,
891         [NF4SOCK] = S_IFSOCK,
892         [NF4FIFO] = S_IFIFO,
893         [NF4ATTRDIR] = 0,
894         [NF4NAMEDATTR] = 0,
895 };
896 
897 struct compound_hdr {
898         int32_t         status;
899         uint32_t        nops;
900         __be32 *        nops_p;
901         uint32_t        taglen;
902         char *          tag;
903         uint32_t        replen;         /* expected reply words */
904         u32             minorversion;
905 };
906 
907 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
908 {
909         __be32 *p = xdr_reserve_space(xdr, nbytes);
910         BUG_ON(!p);
911         return p;
912 }
913 
914 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
915 {
916         __be32 *p;
917 
918         p = xdr_reserve_space(xdr, len);
919         xdr_encode_opaque_fixed(p, buf, len);
920 }
921 
922 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
923 {
924         __be32 *p;
925 
926         p = reserve_space(xdr, 4 + len);
927         xdr_encode_opaque(p, str, len);
928 }
929 
930 static void encode_uint32(struct xdr_stream *xdr, u32 n)
931 {
932         __be32 *p;
933 
934         p = reserve_space(xdr, 4);
935         *p = cpu_to_be32(n);
936 }
937 
938 static void encode_uint64(struct xdr_stream *xdr, u64 n)
939 {
940         __be32 *p;
941 
942         p = reserve_space(xdr, 8);
943         xdr_encode_hyper(p, n);
944 }
945 
946 static void encode_nfs4_seqid(struct xdr_stream *xdr,
947                 const struct nfs_seqid *seqid)
948 {
949         if (seqid != NULL)
950                 encode_uint32(xdr, seqid->sequence->counter);
951         else
952                 encode_uint32(xdr, 0);
953 }
954 
955 static void encode_compound_hdr(struct xdr_stream *xdr,
956                                 struct rpc_rqst *req,
957                                 struct compound_hdr *hdr)
958 {
959         __be32 *p;
960         struct rpc_auth *auth = req->rq_cred->cr_auth;
961 
962         /* initialize running count of expected bytes in reply.
963          * NOTE: the replied tag SHOULD be the same is the one sent,
964          * but this is not required as a MUST for the server to do so. */
965         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
966 
967         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
968         encode_string(xdr, hdr->taglen, hdr->tag);
969         p = reserve_space(xdr, 8);
970         *p++ = cpu_to_be32(hdr->minorversion);
971         hdr->nops_p = p;
972         *p = cpu_to_be32(hdr->nops);
973 }
974 
975 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
976                 uint32_t replen,
977                 struct compound_hdr *hdr)
978 {
979         encode_uint32(xdr, op);
980         hdr->nops++;
981         hdr->replen += replen;
982 }
983 
984 static void encode_nops(struct compound_hdr *hdr)
985 {
986         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
987         *hdr->nops_p = htonl(hdr->nops);
988 }
989 
990 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
991 {
992         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
993 }
994 
995 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
996 {
997         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
998 }
999 
1000 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1001                                 const struct nfs4_label *label,
1002                                 const struct nfs_server *server)
1003 {
1004         char owner_name[IDMAP_NAMESZ];
1005         char owner_group[IDMAP_NAMESZ];
1006         int owner_namelen = 0;
1007         int owner_grouplen = 0;
1008         __be32 *p;
1009         unsigned i;
1010         uint32_t len = 0;
1011         uint32_t bmval_len;
1012         uint32_t bmval[3] = { 0 };
1013 
1014         /*
1015          * We reserve enough space to write the entire attribute buffer at once.
1016          * In the worst-case, this would be
1017          * 16(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
1018          * = 40 bytes, plus any contribution from variable-length fields
1019          *            such as owner/group.
1020          */
1021         if (iap->ia_valid & ATTR_SIZE) {
1022                 bmval[0] |= FATTR4_WORD0_SIZE;
1023                 len += 8;
1024         }
1025         if (iap->ia_valid & ATTR_MODE) {
1026                 bmval[1] |= FATTR4_WORD1_MODE;
1027                 len += 4;
1028         }
1029         if (iap->ia_valid & ATTR_UID) {
1030                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1031                 if (owner_namelen < 0) {
1032                         dprintk("nfs: couldn't resolve uid %d to string\n",
1033                                         from_kuid(&init_user_ns, iap->ia_uid));
1034                         /* XXX */
1035                         strcpy(owner_name, "nobody");
1036                         owner_namelen = sizeof("nobody") - 1;
1037                         /* goto out; */
1038                 }
1039                 bmval[1] |= FATTR4_WORD1_OWNER;
1040                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1041         }
1042         if (iap->ia_valid & ATTR_GID) {
1043                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1044                 if (owner_grouplen < 0) {
1045                         dprintk("nfs: couldn't resolve gid %d to string\n",
1046                                         from_kgid(&init_user_ns, iap->ia_gid));
1047                         strcpy(owner_group, "nobody");
1048                         owner_grouplen = sizeof("nobody") - 1;
1049                         /* goto out; */
1050                 }
1051                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1052                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1053         }
1054         if (iap->ia_valid & ATTR_ATIME_SET) {
1055                 bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1056                 len += 16;
1057         } else if (iap->ia_valid & ATTR_ATIME) {
1058                 bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1059                 len += 4;
1060         }
1061         if (iap->ia_valid & ATTR_MTIME_SET) {
1062                 bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1063                 len += 16;
1064         } else if (iap->ia_valid & ATTR_MTIME) {
1065                 bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1066                 len += 4;
1067         }
1068         if (label) {
1069                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1070                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1071         }
1072 
1073         if (bmval[2] != 0)
1074                 bmval_len = 3;
1075         else if (bmval[1] != 0)
1076                 bmval_len = 2;
1077         else
1078                 bmval_len = 1;
1079 
1080         p = reserve_space(xdr, 4 + (bmval_len << 2) + 4 + len);
1081 
1082         *p++ = cpu_to_be32(bmval_len);
1083         for (i = 0; i < bmval_len; i++)
1084                 *p++ = cpu_to_be32(bmval[i]);
1085         *p++ = cpu_to_be32(len);
1086 
1087         if (bmval[0] & FATTR4_WORD0_SIZE)
1088                 p = xdr_encode_hyper(p, iap->ia_size);
1089         if (bmval[1] & FATTR4_WORD1_MODE)
1090                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1091         if (bmval[1] & FATTR4_WORD1_OWNER)
1092                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1093         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1094                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1095         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1096                 if (iap->ia_valid & ATTR_ATIME_SET) {
1097                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1098                         p = xdr_encode_hyper(p, (s64)iap->ia_atime.tv_sec);
1099                         *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
1100                 } else
1101                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1102         }
1103         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1104                 if (iap->ia_valid & ATTR_MTIME_SET) {
1105                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1106                         p = xdr_encode_hyper(p, (s64)iap->ia_mtime.tv_sec);
1107                         *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
1108                 } else
1109                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1110         }
1111         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
1112                 *p++ = cpu_to_be32(label->lfs);
1113                 *p++ = cpu_to_be32(label->pi);
1114                 *p++ = cpu_to_be32(label->len);
1115                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1116         }
1117 
1118 /* out: */
1119 }
1120 
1121 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1122 {
1123         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1124         encode_uint32(xdr, access);
1125 }
1126 
1127 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1128 {
1129         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1130         encode_nfs4_seqid(xdr, arg->seqid);
1131         encode_nfs4_stateid(xdr, &arg->stateid);
1132 }
1133 
1134 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1135 {
1136         __be32 *p;
1137 
1138         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1139         p = reserve_space(xdr, 12);
1140         p = xdr_encode_hyper(p, args->offset);
1141         *p = cpu_to_be32(args->count);
1142 }
1143 
1144 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1145 {
1146         __be32 *p;
1147 
1148         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1149         encode_uint32(xdr, create->ftype);
1150 
1151         switch (create->ftype) {
1152         case NF4LNK:
1153                 p = reserve_space(xdr, 4);
1154                 *p = cpu_to_be32(create->u.symlink.len);
1155                 xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
1156                 break;
1157 
1158         case NF4BLK: case NF4CHR:
1159                 p = reserve_space(xdr, 8);
1160                 *p++ = cpu_to_be32(create->u.device.specdata1);
1161                 *p = cpu_to_be32(create->u.device.specdata2);
1162                 break;
1163 
1164         default:
1165                 break;
1166         }
1167 
1168         encode_string(xdr, create->name->len, create->name->name);
1169         encode_attrs(xdr, create->attrs, create->label, create->server);
1170 }
1171 
1172 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
1173 {
1174         __be32 *p;
1175 
1176         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1177         p = reserve_space(xdr, 8);
1178         *p++ = cpu_to_be32(1);
1179         *p = cpu_to_be32(bitmap);
1180 }
1181 
1182 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
1183 {
1184         __be32 *p;
1185 
1186         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1187         p = reserve_space(xdr, 12);
1188         *p++ = cpu_to_be32(2);
1189         *p++ = cpu_to_be32(bm0);
1190         *p = cpu_to_be32(bm1);
1191 }
1192 
1193 static void
1194 encode_getattr_three(struct xdr_stream *xdr,
1195                      uint32_t bm0, uint32_t bm1, uint32_t bm2,
1196                      struct compound_hdr *hdr)
1197 {
1198         __be32 *p;
1199 
1200         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1201         if (bm2) {
1202                 p = reserve_space(xdr, 16);
1203                 *p++ = cpu_to_be32(3);
1204                 *p++ = cpu_to_be32(bm0);
1205                 *p++ = cpu_to_be32(bm1);
1206                 *p = cpu_to_be32(bm2);
1207         } else if (bm1) {
1208                 p = reserve_space(xdr, 12);
1209                 *p++ = cpu_to_be32(2);
1210                 *p++ = cpu_to_be32(bm0);
1211                 *p = cpu_to_be32(bm1);
1212         } else {
1213                 p = reserve_space(xdr, 8);
1214                 *p++ = cpu_to_be32(1);
1215                 *p = cpu_to_be32(bm0);
1216         }
1217 }
1218 
1219 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1220 {
1221         encode_getattr_three(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1222                            bitmask[1] & nfs4_fattr_bitmap[1],
1223                            bitmask[2] & nfs4_fattr_bitmap[2],
1224                            hdr);
1225 }
1226 
1227 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1228                                  const u32 *open_bitmap,
1229                                  struct compound_hdr *hdr)
1230 {
1231         encode_getattr_three(xdr,
1232                              bitmask[0] & open_bitmap[0],
1233                              bitmask[1] & open_bitmap[1],
1234                              bitmask[2] & open_bitmap[2],
1235                              hdr);
1236 }
1237 
1238 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1239 {
1240         encode_getattr_three(xdr,
1241                              bitmask[0] & nfs4_fsinfo_bitmap[0],
1242                              bitmask[1] & nfs4_fsinfo_bitmap[1],
1243                              bitmask[2] & nfs4_fsinfo_bitmap[2],
1244                              hdr);
1245 }
1246 
1247 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1248 {
1249         encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1250                            bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1251 }
1252 
1253 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1254 {
1255         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1256 }
1257 
1258 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1259 {
1260         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1261         encode_string(xdr, name->len, name->name);
1262 }
1263 
1264 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1265 {
1266         if (fl->fl_type == F_RDLCK)
1267                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1268         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1269 }
1270 
1271 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1272 {
1273         if (fl->fl_end == OFFSET_MAX)
1274                 return ~(uint64_t)0;
1275         return fl->fl_end - fl->fl_start + 1;
1276 }
1277 
1278 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1279 {
1280         __be32 *p;
1281 
1282         p = reserve_space(xdr, 32);
1283         p = xdr_encode_hyper(p, lowner->clientid);
1284         *p++ = cpu_to_be32(20);
1285         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1286         *p++ = cpu_to_be32(lowner->s_dev);
1287         xdr_encode_hyper(p, lowner->id);
1288 }
1289 
1290 /*
1291  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1292  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1293  */
1294 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1295 {
1296         __be32 *p;
1297 
1298         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1299         p = reserve_space(xdr, 28);
1300         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1301         *p++ = cpu_to_be32(args->reclaim);
1302         p = xdr_encode_hyper(p, args->fl->fl_start);
1303         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1304         *p = cpu_to_be32(args->new_lock_owner);
1305         if (args->new_lock_owner){
1306                 encode_nfs4_seqid(xdr, args->open_seqid);
1307                 encode_nfs4_stateid(xdr, &args->open_stateid);
1308                 encode_nfs4_seqid(xdr, args->lock_seqid);
1309                 encode_lockowner(xdr, &args->lock_owner);
1310         }
1311         else {
1312                 encode_nfs4_stateid(xdr, &args->lock_stateid);
1313                 encode_nfs4_seqid(xdr, args->lock_seqid);
1314         }
1315 }
1316 
1317 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1318 {
1319         __be32 *p;
1320 
1321         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1322         p = reserve_space(xdr, 20);
1323         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1324         p = xdr_encode_hyper(p, args->fl->fl_start);
1325         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1326         encode_lockowner(xdr, &args->lock_owner);
1327 }
1328 
1329 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1330 {
1331         __be32 *p;
1332 
1333         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1334         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1335         encode_nfs4_seqid(xdr, args->seqid);
1336         encode_nfs4_stateid(xdr, &args->stateid);
1337         p = reserve_space(xdr, 16);
1338         p = xdr_encode_hyper(p, args->fl->fl_start);
1339         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1340 }
1341 
1342 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1343 {
1344         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1345         encode_lockowner(xdr, lowner);
1346 }
1347 
1348 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1349 {
1350         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1351         encode_string(xdr, name->len, name->name);
1352 }
1353 
1354 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1355 {
1356         __be32 *p;
1357 
1358         p = reserve_space(xdr, 8);
1359         *p++ = cpu_to_be32(share_access);
1360         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1361 }
1362 
1363 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1364 {
1365         __be32 *p;
1366  /*
1367  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1368  * owner 4 = 32
1369  */
1370         encode_nfs4_seqid(xdr, arg->seqid);
1371         encode_share_access(xdr, arg->share_access);
1372         p = reserve_space(xdr, 36);
1373         p = xdr_encode_hyper(p, arg->clientid);
1374         *p++ = cpu_to_be32(24);
1375         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1376         *p++ = cpu_to_be32(arg->server->s_dev);
1377         *p++ = cpu_to_be32(arg->id.uniquifier);
1378         xdr_encode_hyper(p, arg->id.create_time);
1379 }
1380 
1381 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1382 {
1383         struct iattr dummy;
1384         __be32 *p;
1385 
1386         p = reserve_space(xdr, 4);
1387         switch(arg->createmode) {
1388         case NFS4_CREATE_UNCHECKED:
1389                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1390                 encode_attrs(xdr, arg->u.attrs, arg->label, arg->server);
1391                 break;
1392         case NFS4_CREATE_GUARDED:
1393                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1394                 encode_attrs(xdr, arg->u.attrs, arg->label, arg->server);
1395                 break;
1396         case NFS4_CREATE_EXCLUSIVE:
1397                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1398                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1399                 break;
1400         case NFS4_CREATE_EXCLUSIVE4_1:
1401                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1402                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1403                 dummy.ia_valid = 0;
1404                 encode_attrs(xdr, &dummy, arg->label, arg->server);
1405         }
1406 }
1407 
1408 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1409 {
1410         __be32 *p;
1411 
1412         p = reserve_space(xdr, 4);
1413         switch (arg->open_flags & O_CREAT) {
1414         case 0:
1415                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1416                 break;
1417         default:
1418                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1419                 encode_createmode(xdr, arg);
1420         }
1421 }
1422 
1423 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1424 {
1425         __be32 *p;
1426 
1427         p = reserve_space(xdr, 4);
1428         switch (delegation_type) {
1429         case 0:
1430                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1431                 break;
1432         case FMODE_READ:
1433                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1434                 break;
1435         case FMODE_WRITE|FMODE_READ:
1436                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1437                 break;
1438         default:
1439                 BUG();
1440         }
1441 }
1442 
1443 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1444 {
1445         __be32 *p;
1446 
1447         p = reserve_space(xdr, 4);
1448         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1449         encode_string(xdr, name->len, name->name);
1450 }
1451 
1452 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1453 {
1454         __be32 *p;
1455 
1456         p = reserve_space(xdr, 4);
1457         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1458         encode_delegation_type(xdr, type);
1459 }
1460 
1461 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1462 {
1463         __be32 *p;
1464 
1465         p = reserve_space(xdr, 4);
1466         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1467         encode_nfs4_stateid(xdr, stateid);
1468         encode_string(xdr, name->len, name->name);
1469 }
1470 
1471 static inline void encode_claim_fh(struct xdr_stream *xdr)
1472 {
1473         __be32 *p;
1474 
1475         p = reserve_space(xdr, 4);
1476         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1477 }
1478 
1479 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1480 {
1481         __be32 *p;
1482 
1483         p = reserve_space(xdr, 4);
1484         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1485         encode_nfs4_stateid(xdr, stateid);
1486 }
1487 
1488 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1489 {
1490         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1491         encode_openhdr(xdr, arg);
1492         encode_opentype(xdr, arg);
1493         switch (arg->claim) {
1494         case NFS4_OPEN_CLAIM_NULL:
1495                 encode_claim_null(xdr, arg->name);
1496                 break;
1497         case NFS4_OPEN_CLAIM_PREVIOUS:
1498                 encode_claim_previous(xdr, arg->u.delegation_type);
1499                 break;
1500         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1501                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1502                 break;
1503         case NFS4_OPEN_CLAIM_FH:
1504                 encode_claim_fh(xdr);
1505                 break;
1506         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1507                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1508                 break;
1509         default:
1510                 BUG();
1511         }
1512 }
1513 
1514 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1515 {
1516         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1517         encode_nfs4_stateid(xdr, arg->stateid);
1518         encode_nfs4_seqid(xdr, arg->seqid);
1519 }
1520 
1521 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1522 {
1523         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1524         encode_nfs4_stateid(xdr, &arg->stateid);
1525         encode_nfs4_seqid(xdr, arg->seqid);
1526         encode_share_access(xdr, arg->share_access);
1527 }
1528 
1529 static void
1530 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1531 {
1532         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1533         encode_string(xdr, fh->size, fh->data);
1534 }
1535 
1536 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1537 {
1538         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1539 }
1540 
1541 static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1542                         struct compound_hdr *hdr)
1543 {
1544         __be32 *p;
1545 
1546         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1547         encode_nfs4_stateid(xdr, &args->stateid);
1548 
1549         p = reserve_space(xdr, 12);
1550         p = xdr_encode_hyper(p, args->offset);
1551         *p = cpu_to_be32(args->count);
1552 }
1553 
1554 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1555 {
1556         uint32_t attrs[3] = {
1557                 FATTR4_WORD0_RDATTR_ERROR,
1558                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1559         };
1560         uint32_t dircount = readdir->count >> 1;
1561         __be32 *p, verf[2];
1562         uint32_t attrlen = 0;
1563         unsigned int i;
1564 
1565         if (readdir->plus) {
1566                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1567                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1568                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1569                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1570                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1571                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1572                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1573                 dircount >>= 1;
1574         }
1575         /* Use mounted_on_fileid only if the server supports it */
1576         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1577                 attrs[0] |= FATTR4_WORD0_FILEID;
1578         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1579                 attrs[i] &= readdir->bitmask[i];
1580                 if (attrs[i] != 0)
1581                         attrlen = i+1;
1582         }
1583 
1584         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1585         encode_uint64(xdr, readdir->cookie);
1586         encode_nfs4_verifier(xdr, &readdir->verifier);
1587         p = reserve_space(xdr, 12 + (attrlen << 2));
1588         *p++ = cpu_to_be32(dircount);
1589         *p++ = cpu_to_be32(readdir->count);
1590         *p++ = cpu_to_be32(attrlen);
1591         for (i = 0; i < attrlen; i++)
1592                 *p++ = cpu_to_be32(attrs[i]);
1593         memcpy(verf, readdir->verifier.data, sizeof(verf));
1594 
1595         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1596                         __func__,
1597                         (unsigned long long)readdir->cookie,
1598                         verf[0], verf[1],
1599                         attrs[0] & readdir->bitmask[0],
1600                         attrs[1] & readdir->bitmask[1],
1601                         attrs[2] & readdir->bitmask[2]);
1602 }
1603 
1604 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1605 {
1606         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1607 }
1608 
1609 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1610 {
1611         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1612         encode_string(xdr, name->len, name->name);
1613 }
1614 
1615 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1616 {
1617         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1618         encode_string(xdr, oldname->len, oldname->name);
1619         encode_string(xdr, newname->len, newname->name);
1620 }
1621 
1622 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1623                          struct compound_hdr *hdr)
1624 {
1625         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1626         encode_uint64(xdr, clid);
1627 }
1628 
1629 static void
1630 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1631 {
1632         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1633 }
1634 
1635 static void
1636 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1637 {
1638         __be32 *p;
1639 
1640         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1641         encode_nfs4_stateid(xdr, &zero_stateid);
1642         p = reserve_space(xdr, 2*4);
1643         *p++ = cpu_to_be32(1);
1644         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1645         p = reserve_space(xdr, 4);
1646         *p = cpu_to_be32(arg->acl_len);
1647         xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1648 }
1649 
1650 static void
1651 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1652 {
1653         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1654 }
1655 
1656 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1657 {
1658         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1659         encode_nfs4_stateid(xdr, &arg->stateid);
1660         encode_attrs(xdr, arg->iap, arg->label, server);
1661 }
1662 
1663 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1664 {
1665         __be32 *p;
1666 
1667         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1668         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1669 
1670         encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1671         p = reserve_space(xdr, 4);
1672         *p = cpu_to_be32(setclientid->sc_prog);
1673         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1674         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1675         p = reserve_space(xdr, 4);
1676         *p = cpu_to_be32(setclientid->sc_cb_ident);
1677 }
1678 
1679 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1680 {
1681         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1682                         decode_setclientid_confirm_maxsz, hdr);
1683         encode_uint64(xdr, arg->clientid);
1684         encode_nfs4_verifier(xdr, &arg->confirm);
1685 }
1686 
1687 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1688                          struct compound_hdr *hdr)
1689 {
1690         __be32 *p;
1691 
1692         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1693         encode_nfs4_stateid(xdr, &args->stateid);
1694 
1695         p = reserve_space(xdr, 16);
1696         p = xdr_encode_hyper(p, args->offset);
1697         *p++ = cpu_to_be32(args->stable);
1698         *p = cpu_to_be32(args->count);
1699 
1700         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1701 }
1702 
1703 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1704 {
1705         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1706         encode_nfs4_stateid(xdr, stateid);
1707 }
1708 
1709 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1710 {
1711         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1712         encode_string(xdr, name->len, name->name);
1713 }
1714 
1715 #if defined(CONFIG_NFS_V4_1)
1716 /* NFSv4.1 operations */
1717 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1718                                    struct nfs41_bind_conn_to_session_args *args,
1719                                    struct compound_hdr *hdr)
1720 {
1721         __be32 *p;
1722 
1723         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1724                 decode_bind_conn_to_session_maxsz, hdr);
1725         encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1726         p = xdr_reserve_space(xdr, 8);
1727         *p++ = cpu_to_be32(args->dir);
1728         *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1729 }
1730 
1731 static void encode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
1732 {
1733         unsigned int i;
1734         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1735         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1736                 encode_uint32(xdr, op_map->u.words[i]);
1737 }
1738 
1739 static void encode_exchange_id(struct xdr_stream *xdr,
1740                                struct nfs41_exchange_id_args *args,
1741                                struct compound_hdr *hdr)
1742 {
1743         __be32 *p;
1744         char impl_name[IMPL_NAME_LIMIT];
1745         int len = 0;
1746 
1747         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1748         encode_nfs4_verifier(xdr, args->verifier);
1749 
1750         encode_string(xdr, args->id_len, args->id);
1751 
1752         encode_uint32(xdr, args->flags);
1753         encode_uint32(xdr, args->state_protect.how);
1754 
1755         switch (args->state_protect.how) {
1756         case SP4_NONE:
1757                 break;
1758         case SP4_MACH_CRED:
1759                 encode_op_map(xdr, &args->state_protect.enforce);
1760                 encode_op_map(xdr, &args->state_protect.allow);
1761                 break;
1762         default:
1763                 WARN_ON_ONCE(1);
1764                 break;
1765         }
1766 
1767         if (send_implementation_id &&
1768             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1769             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1770                 <= sizeof(impl_name) + 1)
1771                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1772                                utsname()->sysname, utsname()->release,
1773                                utsname()->version, utsname()->machine);
1774 
1775         if (len > 0) {
1776                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1777 
1778                 encode_string(xdr,
1779                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1780                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1781                 encode_string(xdr, len, impl_name);
1782                 /* just send zeros for nii_date - the date is in nii_name */
1783                 p = reserve_space(xdr, 12);
1784                 p = xdr_encode_hyper(p, 0);
1785                 *p = cpu_to_be32(0);
1786         } else
1787                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1788 }
1789 
1790 static void encode_create_session(struct xdr_stream *xdr,
1791                                   struct nfs41_create_session_args *args,
1792                                   struct compound_hdr *hdr)
1793 {
1794         __be32 *p;
1795         struct nfs_client *clp = args->client;
1796         struct rpc_clnt *clnt = clp->cl_rpcclient;
1797         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1798         u32 max_resp_sz_cached;
1799 
1800         /*
1801          * Assumes OPEN is the biggest non-idempotent compound.
1802          * 2 is the verifier.
1803          */
1804         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1805                               RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1806 
1807         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1808         p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1809         p = xdr_encode_hyper(p, args->clientid);
1810         *p++ = cpu_to_be32(args->seqid);                        /*Sequence id */
1811         *p++ = cpu_to_be32(args->flags);                        /*flags */
1812 
1813         /* Fore Channel */
1814         *p++ = cpu_to_be32(0);                          /* header padding size */
1815         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1816         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1817         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1818         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1819         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1820         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1821 
1822         /* Back Channel */
1823         *p++ = cpu_to_be32(0);                          /* header padding size */
1824         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1825         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1826         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1827         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1828         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1829         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1830 
1831         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1832         *p++ = cpu_to_be32(1);
1833         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1834 
1835         /* authsys_parms rfc1831 */
1836         *p++ = cpu_to_be32(nn->boot_time.tv_nsec);      /* stamp */
1837         p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1838         *p++ = cpu_to_be32(0);                          /* UID */
1839         *p++ = cpu_to_be32(0);                          /* GID */
1840         *p = cpu_to_be32(0);                            /* No more gids */
1841 }
1842 
1843 static void encode_destroy_session(struct xdr_stream *xdr,
1844                                    struct nfs4_session *session,
1845                                    struct compound_hdr *hdr)
1846 {
1847         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1848         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1849 }
1850 
1851 static void encode_destroy_clientid(struct xdr_stream *xdr,
1852                                    uint64_t clientid,
1853                                    struct compound_hdr *hdr)
1854 {
1855         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1856         encode_uint64(xdr, clientid);
1857 }
1858 
1859 static void encode_reclaim_complete(struct xdr_stream *xdr,
1860                                     struct nfs41_reclaim_complete_args *args,
1861                                     struct compound_hdr *hdr)
1862 {
1863         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1864         encode_uint32(xdr, args->one_fs);
1865 }
1866 #endif /* CONFIG_NFS_V4_1 */
1867 
1868 static void encode_sequence(struct xdr_stream *xdr,
1869                             const struct nfs4_sequence_args *args,
1870                             struct compound_hdr *hdr)
1871 {
1872 #if defined(CONFIG_NFS_V4_1)
1873         struct nfs4_session *session;
1874         struct nfs4_slot_table *tp;
1875         struct nfs4_slot *slot = args->sa_slot;
1876         __be32 *p;
1877 
1878         tp = slot->table;
1879         session = tp->session;
1880         if (!session)
1881                 return;
1882 
1883         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1884 
1885         /*
1886          * Sessionid + seqid + slotid + max slotid + cache_this
1887          */
1888         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1889                 "max_slotid=%d cache_this=%d\n",
1890                 __func__,
1891                 ((u32 *)session->sess_id.data)[0],
1892                 ((u32 *)session->sess_id.data)[1],
1893                 ((u32 *)session->sess_id.data)[2],
1894                 ((u32 *)session->sess_id.data)[3],
1895                 slot->seq_nr, slot->slot_nr,
1896                 tp->highest_used_slotid, args->sa_cache_this);
1897         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1898         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1899         *p++ = cpu_to_be32(slot->seq_nr);
1900         *p++ = cpu_to_be32(slot->slot_nr);
1901         *p++ = cpu_to_be32(tp->highest_used_slotid);
1902         *p = cpu_to_be32(args->sa_cache_this);
1903 #endif /* CONFIG_NFS_V4_1 */
1904 }
1905 
1906 #ifdef CONFIG_NFS_V4_1
1907 static void
1908 encode_getdeviceinfo(struct xdr_stream *xdr,
1909                      const struct nfs4_getdeviceinfo_args *args,
1910                      struct compound_hdr *hdr)
1911 {
1912         __be32 *p;
1913 
1914         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1915         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1916         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1917                                     NFS4_DEVICEID4_SIZE);
1918         *p++ = cpu_to_be32(args->pdev->layout_type);
1919         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1920 
1921         p = reserve_space(xdr, 4 + 4);
1922         *p++ = cpu_to_be32(1);                  /* bitmap length */
1923         *p++ = cpu_to_be32(NOTIFY_DEVICEID4_CHANGE | NOTIFY_DEVICEID4_DELETE);
1924 }
1925 
1926 static void
1927 encode_layoutget(struct xdr_stream *xdr,
1928                       const struct nfs4_layoutget_args *args,
1929                       struct compound_hdr *hdr)
1930 {
1931         __be32 *p;
1932 
1933         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1934         p = reserve_space(xdr, 36);
1935         *p++ = cpu_to_be32(0);     /* Signal layout available */
1936         *p++ = cpu_to_be32(args->type);
1937         *p++ = cpu_to_be32(args->range.iomode);
1938         p = xdr_encode_hyper(p, args->range.offset);
1939         p = xdr_encode_hyper(p, args->range.length);
1940         p = xdr_encode_hyper(p, args->minlength);
1941         encode_nfs4_stateid(xdr, &args->stateid);
1942         encode_uint32(xdr, args->maxcount);
1943 
1944         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1945                 __func__,
1946                 args->type,
1947                 args->range.iomode,
1948                 (unsigned long)args->range.offset,
1949                 (unsigned long)args->range.length,
1950                 args->maxcount);
1951 }
1952 
1953 static int
1954 encode_layoutcommit(struct xdr_stream *xdr,
1955                     struct inode *inode,
1956                     struct nfs4_layoutcommit_args *args,
1957                     struct compound_hdr *hdr)
1958 {
1959         __be32 *p;
1960 
1961         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
1962                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
1963 
1964         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
1965         p = reserve_space(xdr, 20);
1966         /* Only whole file layouts */
1967         p = xdr_encode_hyper(p, 0); /* offset */
1968         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
1969         *p = cpu_to_be32(0); /* reclaim */
1970         encode_nfs4_stateid(xdr, &args->stateid);
1971         p = reserve_space(xdr, 20);
1972         *p++ = cpu_to_be32(1); /* newoffset = TRUE */
1973         p = xdr_encode_hyper(p, args->lastbytewritten);
1974         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
1975         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
1976 
1977         if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit) {
1978                 NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
1979                         NFS_I(inode)->layout, xdr, args);
1980         } else {
1981                 encode_uint32(xdr, args->layoutupdate_len);
1982                 if (args->layoutupdate_pages) {
1983                         xdr_write_pages(xdr, args->layoutupdate_pages, 0,
1984                                         args->layoutupdate_len);
1985                 }
1986         }
1987 
1988         return 0;
1989 }
1990 
1991 static void
1992 encode_layoutreturn(struct xdr_stream *xdr,
1993                     const struct nfs4_layoutreturn_args *args,
1994                     struct compound_hdr *hdr)
1995 {
1996         __be32 *p;
1997 
1998         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
1999         p = reserve_space(xdr, 16);
2000         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2001         *p++ = cpu_to_be32(args->layout_type);
2002         *p++ = cpu_to_be32(args->range.iomode);
2003         *p = cpu_to_be32(RETURN_FILE);
2004         p = reserve_space(xdr, 16);
2005         p = xdr_encode_hyper(p, args->range.offset);
2006         p = xdr_encode_hyper(p, args->range.length);
2007         spin_lock(&args->inode->i_lock);
2008         encode_nfs4_stateid(xdr, &args->stateid);
2009         spin_unlock(&args->inode->i_lock);
2010         if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
2011                 NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
2012                         NFS_I(args->inode)->layout, xdr, args);
2013         } else
2014                 encode_uint32(xdr, 0);
2015 }
2016 
2017 static int
2018 encode_secinfo_no_name(struct xdr_stream *xdr,
2019                        const struct nfs41_secinfo_no_name_args *args,
2020                        struct compound_hdr *hdr)
2021 {
2022         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2023         encode_uint32(xdr, args->style);
2024         return 0;
2025 }
2026 
2027 static void encode_test_stateid(struct xdr_stream *xdr,
2028                                 struct nfs41_test_stateid_args *args,
2029                                 struct compound_hdr *hdr)
2030 {
2031         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2032         encode_uint32(xdr, 1);
2033         encode_nfs4_stateid(xdr, args->stateid);
2034 }
2035 
2036 static void encode_free_stateid(struct xdr_stream *xdr,
2037                                 struct nfs41_free_stateid_args *args,
2038                                 struct compound_hdr *hdr)
2039 {
2040         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2041         encode_nfs4_stateid(xdr, &args->stateid);
2042 }
2043 #endif /* CONFIG_NFS_V4_1 */
2044 
2045 /*
2046  * END OF "GENERIC" ENCODE ROUTINES.
2047  */
2048 
2049 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2050 {
2051 #if defined(CONFIG_NFS_V4_1)
2052         struct nfs4_session *session = args->sa_slot->table->session;
2053         if (session)
2054                 return session->clp->cl_mvops->minor_version;
2055 #endif /* CONFIG_NFS_V4_1 */
2056         return 0;
2057 }
2058 
2059 /*
2060  * Encode an ACCESS request
2061  */
2062 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2063                                 const struct nfs4_accessargs *args)
2064 {
2065         struct compound_hdr hdr = {
2066                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2067         };
2068 
2069         encode_compound_hdr(xdr, req, &hdr);
2070         encode_sequence(xdr, &args->seq_args, &hdr);
2071         encode_putfh(xdr, args->fh, &hdr);
2072         encode_access(xdr, args->access, &hdr);
2073         encode_getfattr(xdr, args->bitmask, &hdr);
2074         encode_nops(&hdr);
2075 }
2076 
2077 /*
2078  * Encode LOOKUP request
2079  */
2080 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2081                                 const struct nfs4_lookup_arg *args)
2082 {
2083         struct compound_hdr hdr = {
2084                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2085         };
2086 
2087         encode_compound_hdr(xdr, req, &hdr);
2088         encode_sequence(xdr, &args->seq_args, &hdr);
2089         encode_putfh(xdr, args->dir_fh, &hdr);
2090         encode_lookup(xdr, args->name, &hdr);
2091         encode_getfh(xdr, &hdr);
2092         encode_getfattr(xdr, args->bitmask, &hdr);
2093         encode_nops(&hdr);
2094 }
2095 
2096 /*
2097  * Encode LOOKUP_ROOT request
2098  */
2099 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2100                                      struct xdr_stream *xdr,
2101                                      const struct nfs4_lookup_root_arg *args)
2102 {
2103         struct compound_hdr hdr = {
2104                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2105         };
2106 
2107         encode_compound_hdr(xdr, req, &hdr);
2108         encode_sequence(xdr, &args->seq_args, &hdr);
2109         encode_putrootfh(xdr, &hdr);
2110         encode_getfh(xdr, &hdr);
2111         encode_getfattr(xdr, args->bitmask, &hdr);
2112         encode_nops(&hdr);
2113 }
2114 
2115 /*
2116  * Encode REMOVE request
2117  */
2118 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2119                                 const struct nfs_removeargs *args)
2120 {
2121         struct compound_hdr hdr = {
2122                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2123         };
2124 
2125         encode_compound_hdr(xdr, req, &hdr);
2126         encode_sequence(xdr, &args->seq_args, &hdr);
2127         encode_putfh(xdr, args->fh, &hdr);
2128         encode_remove(xdr, &args->name, &hdr);
2129         encode_nops(&hdr);
2130 }
2131 
2132 /*
2133  * Encode RENAME request
2134  */
2135 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2136                                 const struct nfs_renameargs *args)
2137 {
2138         struct compound_hdr hdr = {
2139                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2140         };
2141 
2142         encode_compound_hdr(xdr, req, &hdr);
2143         encode_sequence(xdr, &args->seq_args, &hdr);
2144         encode_putfh(xdr, args->old_dir, &hdr);
2145         encode_savefh(xdr, &hdr);
2146         encode_putfh(xdr, args->new_dir, &hdr);
2147         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2148         encode_nops(&hdr);
2149 }
2150 
2151 /*
2152  * Encode LINK request
2153  */
2154 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2155                              const struct nfs4_link_arg *args)
2156 {
2157         struct compound_hdr hdr = {
2158                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2159         };
2160 
2161         encode_compound_hdr(xdr, req, &hdr);
2162         encode_sequence(xdr, &args->seq_args, &hdr);
2163         encode_putfh(xdr, args->fh, &hdr);
2164         encode_savefh(xdr, &hdr);
2165         encode_putfh(xdr, args->dir_fh, &hdr);
2166         encode_link(xdr, args->name, &hdr);
2167         encode_restorefh(xdr, &hdr);
2168         encode_getfattr(xdr, args->bitmask, &hdr);
2169         encode_nops(&hdr);
2170 }
2171 
2172 /*
2173  * Encode CREATE request
2174  */
2175 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2176                                 const struct nfs4_create_arg *args)
2177 {
2178         struct compound_hdr hdr = {
2179                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2180         };
2181 
2182         encode_compound_hdr(xdr, req, &hdr);
2183         encode_sequence(xdr, &args->seq_args, &hdr);
2184         encode_putfh(xdr, args->dir_fh, &hdr);
2185         encode_create(xdr, args, &hdr);
2186         encode_getfh(xdr, &hdr);
2187         encode_getfattr(xdr, args->bitmask, &hdr);
2188         encode_nops(&hdr);
2189 }
2190 
2191 /*
2192  * Encode SYMLINK request
2193  */
2194 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2195                                  const struct nfs4_create_arg *args)
2196 {
2197         nfs4_xdr_enc_create(req, xdr, args);
2198 }
2199 
2200 /*
2201  * Encode GETATTR request
2202  */
2203 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2204                                  const struct nfs4_getattr_arg *args)
2205 {
2206         struct compound_hdr hdr = {
2207                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2208         };
2209 
2210         encode_compound_hdr(xdr, req, &hdr);
2211         encode_sequence(xdr, &args->seq_args, &hdr);
2212         encode_putfh(xdr, args->fh, &hdr);
2213         encode_getfattr(xdr, args->bitmask, &hdr);
2214         encode_nops(&hdr);
2215 }
2216 
2217 /*
2218  * Encode a CLOSE request
2219  */
2220 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2221                                struct nfs_closeargs *args)
2222 {
2223         struct compound_hdr hdr = {
2224                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2225         };
2226 
2227         encode_compound_hdr(xdr, req, &hdr);
2228         encode_sequence(xdr, &args->seq_args, &hdr);
2229         encode_putfh(xdr, args->fh, &hdr);
2230         encode_close(xdr, args, &hdr);
2231         encode_getfattr(xdr, args->bitmask, &hdr);
2232         encode_nops(&hdr);
2233 }
2234 
2235 /*
2236  * Encode an OPEN request
2237  */
2238 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2239                               struct nfs_openargs *args)
2240 {
2241         struct compound_hdr hdr = {
2242                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2243         };
2244 
2245         encode_compound_hdr(xdr, req, &hdr);
2246         encode_sequence(xdr, &args->seq_args, &hdr);
2247         encode_putfh(xdr, args->fh, &hdr);
2248         encode_open(xdr, args, &hdr);
2249         encode_getfh(xdr, &hdr);
2250         if (args->access)
2251                 encode_access(xdr, args->access, &hdr);
2252         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2253         encode_nops(&hdr);
2254 }
2255 
2256 /*
2257  * Encode an OPEN_CONFIRM request
2258  */
2259 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2260                                       struct xdr_stream *xdr,
2261                                       struct nfs_open_confirmargs *args)
2262 {
2263         struct compound_hdr hdr = {
2264                 .nops   = 0,
2265         };
2266 
2267         encode_compound_hdr(xdr, req, &hdr);
2268         encode_putfh(xdr, args->fh, &hdr);
2269         encode_open_confirm(xdr, args, &hdr);
2270         encode_nops(&hdr);
2271 }
2272 
2273 /*
2274  * Encode an OPEN request with no attributes.
2275  */
2276 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2277                                      struct xdr_stream *xdr,
2278                                      struct nfs_openargs *args)
2279 {
2280         struct compound_hdr hdr = {
2281                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2282         };
2283 
2284         encode_compound_hdr(xdr, req, &hdr);
2285         encode_sequence(xdr, &args->seq_args, &hdr);
2286         encode_putfh(xdr, args->fh, &hdr);
2287         encode_open(xdr, args, &hdr);
2288         if (args->access)
2289                 encode_access(xdr, args->access, &hdr);
2290         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2291         encode_nops(&hdr);
2292 }
2293 
2294 /*
2295  * Encode an OPEN_DOWNGRADE request
2296  */
2297 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2298                                         struct xdr_stream *xdr,
2299                                         struct nfs_closeargs *args)
2300 {
2301         struct compound_hdr hdr = {
2302                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2303         };
2304 
2305         encode_compound_hdr(xdr, req, &hdr);
2306         encode_sequence(xdr, &args->seq_args, &hdr);
2307         encode_putfh(xdr, args->fh, &hdr);
2308         encode_open_downgrade(xdr, args, &hdr);
2309         encode_getfattr(xdr, args->bitmask, &hdr);
2310         encode_nops(&hdr);
2311 }
2312 
2313 /*
2314  * Encode a LOCK request
2315  */
2316 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2317                               struct nfs_lock_args *args)
2318 {
2319         struct compound_hdr hdr = {
2320                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2321         };
2322 
2323         encode_compound_hdr(xdr, req, &hdr);
2324         encode_sequence(xdr, &args->seq_args, &hdr);
2325         encode_putfh(xdr, args->fh, &hdr);
2326         encode_lock(xdr, args, &hdr);
2327         encode_nops(&hdr);
2328 }
2329 
2330 /*
2331  * Encode a LOCKT request
2332  */
2333 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2334                                struct nfs_lockt_args *args)
2335 {
2336         struct compound_hdr hdr = {
2337                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2338         };
2339 
2340         encode_compound_hdr(xdr, req, &hdr);
2341         encode_sequence(xdr, &args->seq_args, &hdr);
2342         encode_putfh(xdr, args->fh, &hdr);
2343         encode_lockt(xdr, args, &hdr);
2344         encode_nops(&hdr);
2345 }
2346 
2347 /*
2348  * Encode a LOCKU request
2349  */
2350 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2351                                struct nfs_locku_args *args)
2352 {
2353         struct compound_hdr hdr = {
2354                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2355         };
2356 
2357         encode_compound_hdr(xdr, req, &hdr);
2358         encode_sequence(xdr, &args->seq_args, &hdr);
2359         encode_putfh(xdr, args->fh, &hdr);
2360         encode_locku(xdr, args, &hdr);
2361         encode_nops(&hdr);
2362 }
2363 
2364 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2365                                            struct xdr_stream *xdr,
2366                                         struct nfs_release_lockowner_args *args)
2367 {
2368         struct compound_hdr hdr = {
2369                 .minorversion = 0,
2370         };
2371 
2372         encode_compound_hdr(xdr, req, &hdr);
2373         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2374         encode_nops(&hdr);
2375 }
2376 
2377 /*
2378  * Encode a READLINK request
2379  */
2380 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2381                                   const struct nfs4_readlink *args)
2382 {
2383         struct compound_hdr hdr = {
2384                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2385         };
2386 
2387         encode_compound_hdr(xdr, req, &hdr);
2388         encode_sequence(xdr, &args->seq_args, &hdr);
2389         encode_putfh(xdr, args->fh, &hdr);
2390         encode_readlink(xdr, args, req, &hdr);
2391 
2392         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2393                         args->pgbase, args->pglen);
2394         encode_nops(&hdr);
2395 }
2396 
2397 /*
2398  * Encode a READDIR request
2399  */
2400 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2401                                  const struct nfs4_readdir_arg *args)
2402 {
2403         struct compound_hdr hdr = {
2404                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2405         };
2406 
2407         encode_compound_hdr(xdr, req, &hdr);
2408         encode_sequence(xdr, &args->seq_args, &hdr);
2409         encode_putfh(xdr, args->fh, &hdr);
2410         encode_readdir(xdr, args, req, &hdr);
2411 
2412         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2413                          args->pgbase, args->count);
2414         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2415                         __func__, hdr.replen << 2, args->pages,
2416                         args->pgbase, args->count);
2417         encode_nops(&hdr);
2418 }
2419 
2420 /*
2421  * Encode a READ request
2422  */
2423 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2424                               struct nfs_pgio_args *args)
2425 {
2426         struct compound_hdr hdr = {
2427                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2428         };
2429 
2430         encode_compound_hdr(xdr, req, &hdr);
2431         encode_sequence(xdr, &args->seq_args, &hdr);
2432         encode_putfh(xdr, args->fh, &hdr);
2433         encode_read(xdr, args, &hdr);
2434 
2435         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2436                          args->pages, args->pgbase, args->count);
2437         req->rq_rcv_buf.flags |= XDRBUF_READ;
2438         encode_nops(&hdr);
2439 }
2440 
2441 /*
2442  * Encode an SETATTR request
2443  */
2444 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2445                                  struct nfs_setattrargs *args)
2446 {
2447         struct compound_hdr hdr = {
2448                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2449         };
2450 
2451         encode_compound_hdr(xdr, req, &hdr);
2452         encode_sequence(xdr, &args->seq_args, &hdr);
2453         encode_putfh(xdr, args->fh, &hdr);
2454         encode_setattr(xdr, args, args->server, &hdr);
2455         encode_getfattr(xdr, args->bitmask, &hdr);
2456         encode_nops(&hdr);
2457 }
2458 
2459 /*
2460  * Encode a GETACL request
2461  */
2462 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2463                                 struct nfs_getaclargs *args)
2464 {
2465         struct compound_hdr hdr = {
2466                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2467         };
2468         uint32_t replen;
2469 
2470         encode_compound_hdr(xdr, req, &hdr);
2471         encode_sequence(xdr, &args->seq_args, &hdr);
2472         encode_putfh(xdr, args->fh, &hdr);
2473         replen = hdr.replen + op_decode_hdr_maxsz + 1;
2474         encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
2475 
2476         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2477                 args->acl_pages, args->acl_pgbase, args->acl_len);
2478 
2479         encode_nops(&hdr);
2480 }
2481 
2482 /*
2483  * Encode a WRITE request
2484  */
2485 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2486                                struct nfs_pgio_args *args)
2487 {
2488         struct compound_hdr hdr = {
2489                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2490         };
2491 
2492         encode_compound_hdr(xdr, req, &hdr);
2493         encode_sequence(xdr, &args->seq_args, &hdr);
2494         encode_putfh(xdr, args->fh, &hdr);
2495         encode_write(xdr, args, &hdr);
2496         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2497         if (args->bitmask)
2498                 encode_getfattr(xdr, args->bitmask, &hdr);
2499         encode_nops(&hdr);
2500 }
2501 
2502 /*
2503  *  a COMMIT request
2504  */
2505 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2506                                 struct nfs_commitargs *args)
2507 {
2508         struct compound_hdr hdr = {
2509                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2510         };
2511 
2512         encode_compound_hdr(xdr, req, &hdr);
2513         encode_sequence(xdr, &args->seq_args, &hdr);
2514         encode_putfh(xdr, args->fh, &hdr);
2515         encode_commit(xdr, args, &hdr);
2516         encode_nops(&hdr);
2517 }
2518 
2519 /*
2520  * FSINFO request
2521  */
2522 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2523                                 struct nfs4_fsinfo_arg *args)
2524 {
2525         struct compound_hdr hdr = {
2526                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2527         };
2528 
2529         encode_compound_hdr(xdr, req, &hdr);
2530         encode_sequence(xdr, &args->seq_args, &hdr);
2531         encode_putfh(xdr, args->fh, &hdr);
2532         encode_fsinfo(xdr, args->bitmask, &hdr);
2533         encode_nops(&hdr);
2534 }
2535 
2536 /*
2537  * a PATHCONF request
2538  */
2539 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2540                                   const struct nfs4_pathconf_arg *args)
2541 {
2542         struct compound_hdr hdr = {
2543                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2544         };
2545 
2546         encode_compound_hdr(xdr, req, &hdr);
2547         encode_sequence(xdr, &args->seq_args, &hdr);
2548         encode_putfh(xdr, args->fh, &hdr);
2549         encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2550                            &hdr);
2551         encode_nops(&hdr);
2552 }
2553 
2554 /*
2555  * a STATFS request
2556  */
2557 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2558                                 const struct nfs4_statfs_arg *args)
2559 {
2560         struct compound_hdr hdr = {
2561                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2562         };
2563 
2564         encode_compound_hdr(xdr, req, &hdr);
2565         encode_sequence(xdr, &args->seq_args, &hdr);
2566         encode_putfh(xdr, args->fh, &hdr);
2567         encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2568                            args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2569         encode_nops(&hdr);
2570 }
2571 
2572 /*
2573  * GETATTR_BITMAP request
2574  */
2575 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2576                                      struct xdr_stream *xdr,
2577                                      struct nfs4_server_caps_arg *args)
2578 {
2579         struct compound_hdr hdr = {
2580                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2581         };
2582 
2583         encode_compound_hdr(xdr, req, &hdr);
2584         encode_sequence(xdr, &args->seq_args, &hdr);
2585         encode_putfh(xdr, args->fhandle, &hdr);
2586         encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2587                            FATTR4_WORD0_FH_EXPIRE_TYPE|
2588                            FATTR4_WORD0_LINK_SUPPORT|
2589                            FATTR4_WORD0_SYMLINK_SUPPORT|
2590                            FATTR4_WORD0_ACLSUPPORT, &hdr);
2591         encode_nops(&hdr);
2592 }
2593 
2594 /*
2595  * a RENEW request
2596  */
2597 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2598                                struct nfs_client *clp)
2599 {
2600         struct compound_hdr hdr = {
2601                 .nops   = 0,
2602         };
2603 
2604         encode_compound_hdr(xdr, req, &hdr);
2605         encode_renew(xdr, clp->cl_clientid, &hdr);
2606         encode_nops(&hdr);
2607 }
2608 
2609 /*
2610  * a SETCLIENTID request
2611  */
2612 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2613                                      struct xdr_stream *xdr,
2614                                      struct nfs4_setclientid *sc)
2615 {
2616         struct compound_hdr hdr = {
2617                 .nops   = 0,
2618         };
2619 
2620         encode_compound_hdr(xdr, req, &hdr);
2621         encode_setclientid(xdr, sc, &hdr);
2622         encode_nops(&hdr);
2623 }
2624 
2625 /*
2626  * a SETCLIENTID_CONFIRM request
2627  */
2628 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2629                                              struct xdr_stream *xdr,
2630                                              struct nfs4_setclientid_res *arg)
2631 {
2632         struct compound_hdr hdr = {
2633                 .nops   = 0,
2634         };
2635 
2636         encode_compound_hdr(xdr, req, &hdr);
2637         encode_setclientid_confirm(xdr, arg, &hdr);
2638         encode_nops(&hdr);
2639 }
2640 
2641 /*
2642  * DELEGRETURN request
2643  */
2644 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2645                                      struct xdr_stream *xdr,
2646                                      const struct nfs4_delegreturnargs *args)
2647 {
2648         struct compound_hdr hdr = {
2649                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2650         };
2651 
2652         encode_compound_hdr(xdr, req, &hdr);
2653         encode_sequence(xdr, &args->seq_args, &hdr);
2654         encode_putfh(xdr, args->fhandle, &hdr);
2655         encode_getfattr(xdr, args->bitmask, &hdr);
2656         encode_delegreturn(xdr, args->stateid, &hdr);
2657         encode_nops(&hdr);
2658 }
2659 
2660 /*
2661  * Encode FS_LOCATIONS request
2662  */
2663 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2664                                       struct xdr_stream *xdr,
2665                                       struct nfs4_fs_locations_arg *args)
2666 {
2667         struct compound_hdr hdr = {
2668                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2669         };
2670         uint32_t replen;
2671 
2672         encode_compound_hdr(xdr, req, &hdr);
2673         encode_sequence(xdr, &args->seq_args, &hdr);
2674         if (args->migration) {
2675                 encode_putfh(xdr, args->fh, &hdr);
2676                 replen = hdr.replen;
2677                 encode_fs_locations(xdr, args->bitmask, &hdr);
2678                 if (args->renew)
2679                         encode_renew(xdr, args->clientid, &hdr);
2680         } else {
2681                 encode_putfh(xdr, args->dir_fh, &hdr);
2682                 encode_lookup(xdr, args->name, &hdr);
2683                 replen = hdr.replen;
2684                 encode_fs_locations(xdr, args->bitmask, &hdr);
2685         }
2686 
2687         /* Set up reply kvec to capture returned fs_locations array. */
2688         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2689                         0, PAGE_SIZE);
2690         encode_nops(&hdr);
2691 }
2692 
2693 /*
2694  * Encode SECINFO request
2695  */
2696 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2697                                 struct xdr_stream *xdr,
2698                                 struct nfs4_secinfo_arg *args)
2699 {
2700         struct compound_hdr hdr = {
2701                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2702         };
2703 
2704         encode_compound_hdr(xdr, req, &hdr);
2705         encode_sequence(xdr, &args->seq_args, &hdr);
2706         encode_putfh(xdr, args->dir_fh, &hdr);
2707         encode_secinfo(xdr, args->name, &hdr);
2708         encode_nops(&hdr);
2709 }
2710 
2711 /*
2712  * Encode FSID_PRESENT request
2713  */
2714 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2715                                       struct xdr_stream *xdr,
2716                                       struct nfs4_fsid_present_arg *args)
2717 {
2718         struct compound_hdr hdr = {
2719                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2720         };
2721 
2722         encode_compound_hdr(xdr, req, &hdr);
2723         encode_sequence(xdr, &args->seq_args, &hdr);
2724         encode_putfh(xdr, args->fh, &hdr);
2725         encode_getfh(xdr, &hdr);
2726         if (args->renew)
2727                 encode_renew(xdr, args->clientid, &hdr);
2728         encode_nops(&hdr);
2729 }
2730 
2731 #if defined(CONFIG_NFS_V4_1)
2732 /*
2733  * BIND_CONN_TO_SESSION request
2734  */
2735 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2736                                 struct xdr_stream *xdr,
2737                                 struct nfs41_bind_conn_to_session_args *args)
2738 {
2739         struct compound_hdr hdr = {
2740                 .minorversion = args->client->cl_mvops->minor_version,
2741         };
2742 
2743         encode_compound_hdr(xdr, req, &hdr);
2744         encode_bind_conn_to_session(xdr, args, &hdr);
2745         encode_nops(&hdr);
2746 }
2747 
2748 /*
2749  * EXCHANGE_ID request
2750  */
2751 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2752                                      struct xdr_stream *xdr,
2753                                      struct nfs41_exchange_id_args *args)
2754 {
2755         struct compound_hdr hdr = {
2756                 .minorversion = args->client->cl_mvops->minor_version,
2757         };
2758 
2759         encode_compound_hdr(xdr, req, &hdr);
2760         encode_exchange_id(xdr, args, &hdr);
2761         encode_nops(&hdr);
2762 }
2763 
2764 /*
2765  * a CREATE_SESSION request
2766  */
2767 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2768                                         struct xdr_stream *xdr,
2769                                         struct nfs41_create_session_args *args)
2770 {
2771         struct compound_hdr hdr = {
2772                 .minorversion = args->client->cl_mvops->minor_version,
2773         };
2774 
2775         encode_compound_hdr(xdr, req, &hdr);
2776         encode_create_session(xdr, args, &hdr);
2777         encode_nops(&hdr);
2778 }
2779 
2780 /*
2781  * a DESTROY_SESSION request
2782  */
2783 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2784                                          struct xdr_stream *xdr,
2785                                          struct nfs4_session *session)
2786 {
2787         struct compound_hdr hdr = {
2788                 .minorversion = session->clp->cl_mvops->minor_version,
2789         };
2790 
2791         encode_compound_hdr(xdr, req, &hdr);
2792         encode_destroy_session(xdr, session, &hdr);
2793         encode_nops(&hdr);
2794 }
2795 
2796 /*
2797  * a DESTROY_CLIENTID request
2798  */
2799 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2800                                          struct xdr_stream *xdr,
2801                                          struct nfs_client *clp)
2802 {
2803         struct compound_hdr hdr = {
2804                 .minorversion = clp->cl_mvops->minor_version,
2805         };
2806 
2807         encode_compound_hdr(xdr, req, &hdr);
2808         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2809         encode_nops(&hdr);
2810 }
2811 
2812 /*
2813  * a SEQUENCE request
2814  */
2815 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2816                                   struct nfs4_sequence_args *args)
2817 {
2818         struct compound_hdr hdr = {
2819                 .minorversion = nfs4_xdr_minorversion(args),
2820         };
2821 
2822         encode_compound_hdr(xdr, req, &hdr);
2823         encode_sequence(xdr, args, &hdr);
2824         encode_nops(&hdr);
2825 }
2826 
2827 /*
2828  * a GET_LEASE_TIME request
2829  */
2830 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2831                                         struct xdr_stream *xdr,
2832                                         struct nfs4_get_lease_time_args *args)
2833 {
2834         struct compound_hdr hdr = {
2835                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2836         };
2837         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2838 
2839         encode_compound_hdr(xdr, req, &hdr);
2840         encode_sequence(xdr, &args->la_seq_args, &hdr);
2841         encode_putrootfh(xdr, &hdr);
2842         encode_fsinfo(xdr, lease_bitmap, &hdr);
2843         encode_nops(&hdr);
2844 }
2845 
2846 /*
2847  * a RECLAIM_COMPLETE request
2848  */
2849 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2850                                           struct xdr_stream *xdr,
2851                                 struct nfs41_reclaim_complete_args *args)
2852 {
2853         struct compound_hdr hdr = {
2854                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2855         };
2856 
2857         encode_compound_hdr(xdr, req, &hdr);
2858         encode_sequence(xdr, &args->seq_args, &hdr);
2859         encode_reclaim_complete(xdr, args, &hdr);
2860         encode_nops(&hdr);
2861 }
2862 
2863 /*
2864  * Encode GETDEVICEINFO request
2865  */
2866 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
2867                                        struct xdr_stream *xdr,
2868                                        struct nfs4_getdeviceinfo_args *args)
2869 {
2870         struct compound_hdr hdr = {
2871                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2872         };
2873 
2874         encode_compound_hdr(xdr, req, &hdr);
2875         encode_sequence(xdr, &args->seq_args, &hdr);
2876         encode_getdeviceinfo(xdr, args, &hdr);
2877 
2878         /* set up reply kvec. Subtract notification bitmap max size (2)
2879          * so that notification bitmap is put in xdr_buf tail */
2880         xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
2881                          args->pdev->pages, args->pdev->pgbase,
2882                          args->pdev->pglen);
2883 
2884         encode_nops(&hdr);
2885 }
2886 
2887 /*
2888  *  Encode LAYOUTGET request
2889  */
2890 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
2891                                    struct xdr_stream *xdr,
2892                                    struct nfs4_layoutget_args *args)
2893 {
2894         struct compound_hdr hdr = {
2895                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2896         };
2897 
2898         encode_compound_hdr(xdr, req, &hdr);
2899         encode_sequence(xdr, &args->seq_args, &hdr);
2900         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2901         encode_layoutget(xdr, args, &hdr);
2902 
2903         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2904             args->layout.pages, 0, args->layout.pglen);
2905 
2906         encode_nops(&hdr);
2907 }
2908 
2909 /*
2910  *  Encode LAYOUTCOMMIT request
2911  */
2912 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
2913                                       struct xdr_stream *xdr,
2914                                       struct nfs4_layoutcommit_args *args)
2915 {
2916         struct nfs4_layoutcommit_data *data =
2917                 container_of(args, struct nfs4_layoutcommit_data, args);
2918         struct compound_hdr hdr = {
2919                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2920         };
2921 
2922         encode_compound_hdr(xdr, req, &hdr);
2923         encode_sequence(xdr, &args->seq_args, &hdr);
2924         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2925         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
2926         encode_getfattr(xdr, args->bitmask, &hdr);
2927         encode_nops(&hdr);
2928 }
2929 
2930 /*
2931  * Encode LAYOUTRETURN request
2932  */
2933 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
2934                                       struct xdr_stream *xdr,
2935                                       struct nfs4_layoutreturn_args *args)
2936 {
2937         struct compound_hdr hdr = {
2938                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2939         };
2940 
2941         encode_compound_hdr(xdr, req, &hdr);
2942         encode_sequence(xdr, &args->seq_args, &hdr);
2943         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2944         encode_layoutreturn(xdr, args, &hdr);
2945         encode_nops(&hdr);
2946 }
2947 
2948 /*
2949  * Encode SECINFO_NO_NAME request
2950  */
2951 static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
2952                                         struct xdr_stream *xdr,
2953                                         struct nfs41_secinfo_no_name_args *args)
2954 {
2955         struct compound_hdr hdr = {
2956                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2957         };
2958 
2959         encode_compound_hdr(xdr, req, &hdr);
2960         encode_sequence(xdr, &args->seq_args, &hdr);
2961         encode_putrootfh(xdr, &hdr);
2962         encode_secinfo_no_name(xdr, args, &hdr);
2963         encode_nops(&hdr);
2964         return 0;
2965 }
2966 
2967 /*
2968  *  Encode TEST_STATEID request
2969  */
2970 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
2971                                       struct xdr_stream *xdr,
2972                                       struct nfs41_test_stateid_args *args)
2973 {
2974         struct compound_hdr hdr = {
2975                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2976         };
2977 
2978         encode_compound_hdr(xdr, req, &hdr);
2979         encode_sequence(xdr, &args->seq_args, &hdr);
2980         encode_test_stateid(xdr, args, &hdr);
2981         encode_nops(&hdr);
2982 }
2983 
2984 /*
2985  *  Encode FREE_STATEID request
2986  */
2987 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
2988                                      struct xdr_stream *xdr,
2989                                      struct nfs41_free_stateid_args *args)
2990 {
2991         struct compound_hdr hdr = {
2992                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2993         };
2994 
2995         encode_compound_hdr(xdr, req, &hdr);
2996         encode_sequence(xdr, &args->seq_args, &hdr);
2997         encode_free_stateid(xdr, args, &hdr);
2998         encode_nops(&hdr);
2999 }
3000 #endif /* CONFIG_NFS_V4_1 */
3001 
3002 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
3003 {
3004         dprintk("nfs: %s: prematurely hit end of receive buffer. "
3005                 "Remaining buffer length is %tu words.\n",
3006                 func, xdr->end - xdr->p);
3007 }
3008 
3009 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3010 {
3011         __be32 *p;
3012 
3013         p = xdr_inline_decode(xdr, 4);
3014         if (unlikely(!p))
3015                 goto out_overflow;
3016         *len = be32_to_cpup(p);
3017         p = xdr_inline_decode(xdr, *len);
3018         if (unlikely(!p))
3019                 goto out_overflow;
3020         *string = (char *)p;
3021         return 0;
3022 out_overflow:
3023         print_overflow_msg(__func__, xdr);
3024         return -EIO;
3025 }
3026 
3027 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3028 {
3029         __be32 *p;
3030 
3031         p = xdr_inline_decode(xdr, 8);
3032         if (unlikely(!p))
3033                 goto out_overflow;
3034         hdr->status = be32_to_cpup(p++);
3035         hdr->taglen = be32_to_cpup(p);
3036 
3037         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3038         if (unlikely(!p))
3039                 goto out_overflow;
3040         hdr->tag = (char *)p;
3041         p += XDR_QUADLEN(hdr->taglen);
3042         hdr->nops = be32_to_cpup(p);
3043         if (unlikely(hdr->nops < 1))
3044                 return nfs4_stat_to_errno(hdr->status);
3045         return 0;
3046 out_overflow:
3047         print_overflow_msg(__func__, xdr);
3048         return -EIO;
3049 }
3050 
3051 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3052                 int *nfs_retval)
3053 {
3054         __be32 *p;
3055         uint32_t opnum;
3056         int32_t nfserr;
3057 
3058         p = xdr_inline_decode(xdr, 8);
3059         if (unlikely(!p))
3060                 goto out_overflow;
3061         opnum = be32_to_cpup(p++);
3062         if (unlikely(opnum != expected))
3063                 goto out_bad_operation;
3064         nfserr = be32_to_cpup(p);
3065         if (nfserr == NFS_OK)
3066                 *nfs_retval = 0;
3067         else
3068                 *nfs_retval = nfs4_stat_to_errno(nfserr);
3069         return true;
3070 out_bad_operation:
3071         dprintk("nfs: Server returned operation"
3072                 " %d but we issued a request for %d\n",
3073                         opnum, expected);
3074         *nfs_retval = -EREMOTEIO;
3075         return false;
3076 out_overflow:
3077         print_overflow_msg(__func__, xdr);
3078         *nfs_retval = -EIO;
3079         return false;
3080 }
3081 
3082 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3083 {
3084         int retval;
3085 
3086         __decode_op_hdr(xdr, expected, &retval);
3087         return retval;
3088 }
3089 
3090 /* Dummy routine */
3091 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
3092 {
3093         __be32 *p;
3094         unsigned int strlen;
3095         char *str;
3096 
3097         p = xdr_inline_decode(xdr, 12);
3098         if (likely(p))
3099                 return decode_opaque_inline(xdr, &strlen, &str);
3100         print_overflow_msg(__func__, xdr);
3101         return -EIO;
3102 }
3103 
3104 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3105 {
3106         uint32_t bmlen;
3107         __be32 *p;
3108 
3109         p = xdr_inline_decode(xdr, 4);
3110         if (unlikely(!p))
3111                 goto out_overflow;
3112         bmlen = be32_to_cpup(p);
3113 
3114         bitmap[0] = bitmap[1] = bitmap[2] = 0;
3115         p = xdr_inline_decode(xdr, (bmlen << 2));
3116         if (unlikely(!p))
3117                 goto out_overflow;
3118         if (bmlen > 0) {
3119                 bitmap[0] = be32_to_cpup(p++);
3120                 if (bmlen > 1) {
3121                         bitmap[1] = be32_to_cpup(p++);
3122                         if (bmlen > 2)
3123                                 bitmap[2] = be32_to_cpup(p);
3124                 }
3125         }
3126         return 0;
3127 out_overflow:
3128         print_overflow_msg(__func__, xdr);
3129         return -EIO;
3130 }
3131 
3132 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3133 {
3134         __be32 *p;
3135 
3136         p = xdr_inline_decode(xdr, 4);
3137         if (unlikely(!p))
3138                 goto out_overflow;
3139         *attrlen = be32_to_cpup(p);
3140         *savep = xdr_stream_pos(xdr);
3141         return 0;
3142 out_overflow:
3143         print_overflow_msg(__func__, xdr);
3144         return -EIO;
3145 }
3146 
3147 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3148 {
3149         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3150                 int ret;
3151                 ret = decode_attr_bitmap(xdr, bitmask);
3152                 if (unlikely(ret < 0))
3153                         return ret;
3154                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3155         } else
3156                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3157         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3158                 bitmask[0], bitmask[1], bitmask[2]);
3159         return 0;
3160 }
3161 
3162 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3163 {
3164         __be32 *p;
3165         int ret = 0;
3166 
3167         *type = 0;
3168         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3169                 return -EIO;
3170         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3171                 p = xdr_inline_decode(xdr, 4);
3172                 if (unlikely(!p))
3173                         goto out_overflow;
3174                 *type = be32_to_cpup(p);
3175                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3176                         dprintk("%s: bad type %d\n", __func__, *type);
3177                         return -EIO;
3178                 }
3179                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3180                 ret = NFS_ATTR_FATTR_TYPE;
3181         }
3182         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3183         return ret;
3184 out_overflow:
3185         print_overflow_msg(__func__, xdr);
3186         return -EIO;
3187 }
3188 
3189 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3190                                       uint32_t *bitmap, uint32_t *type)
3191 {
3192         __be32 *p;
3193 
3194         *type = 0;
3195         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3196                 return -EIO;
3197         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3198                 p = xdr_inline_decode(xdr, 4);
3199                 if (unlikely(!p))
3200                         goto out_overflow;
3201                 *type = be32_to_cpup(p);
3202                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3203         }
3204         dprintk("%s: expire type=0x%x\n", __func__, *type);
3205         return 0;
3206 out_overflow:
3207         print_overflow_msg(__func__, xdr);
3208         return -EIO;
3209 }
3210 
3211 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3212 {
3213         __be32 *p;
3214         int ret = 0;
3215 
3216         *change = 0;
3217         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3218                 return -EIO;
3219         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3220                 p = xdr_inline_decode(xdr, 8);
3221                 if (unlikely(!p))
3222                         goto out_overflow;
3223                 xdr_decode_hyper(p, change);
3224                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3225                 ret = NFS_ATTR_FATTR_CHANGE;
3226         }
3227         dprintk("%s: change attribute=%Lu\n", __func__,
3228                         (unsigned long long)*change);
3229         return ret;
3230 out_overflow:
3231         print_overflow_msg(__func__, xdr);
3232         return -EIO;
3233 }
3234 
3235 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3236 {
3237         __be32 *p;
3238         int ret = 0;
3239 
3240         *size = 0;
3241         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3242                 return -EIO;
3243         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3244                 p = xdr_inline_decode(xdr, 8);
3245                 if (unlikely(!p))
3246                         goto out_overflow;
3247                 xdr_decode_hyper(p, size);
3248                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3249                 ret = NFS_ATTR_FATTR_SIZE;
3250         }
3251         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3252         return ret;
3253 out_overflow:
3254         print_overflow_msg(__func__, xdr);
3255         return -EIO;
3256 }
3257 
3258 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3259 {
3260         __be32 *p;
3261 
3262         *res = 0;
3263         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3264                 return -EIO;
3265         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3266                 p = xdr_inline_decode(xdr, 4);
3267                 if (unlikely(!p))
3268                         goto out_overflow;
3269                 *res = be32_to_cpup(p);
3270                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3271         }
3272         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3273         return 0;
3274 out_overflow:
3275         print_overflow_msg(__func__, xdr);
3276         return -EIO;
3277 }
3278 
3279 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3280 {
3281         __be32 *p;
3282 
3283         *res = 0;
3284         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3285                 return -EIO;
3286         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3287                 p = xdr_inline_decode(xdr, 4);
3288                 if (unlikely(!p))
3289                         goto out_overflow;
3290                 *res = be32_to_cpup(p);
3291                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3292         }
3293         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3294         return 0;
3295 out_overflow:
3296         print_overflow_msg(__func__, xdr);
3297         return -EIO;
3298 }
3299 
3300 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3301 {
3302         __be32 *p;
3303         int ret = 0;
3304 
3305         fsid->major = 0;
3306         fsid->minor = 0;
3307         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3308                 return -EIO;
3309         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3310                 p = xdr_inline_decode(xdr, 16);
3311                 if (unlikely(!p))
3312                         goto out_overflow;
3313                 p = xdr_decode_hyper(p, &fsid->major);
3314                 xdr_decode_hyper(p, &fsid->minor);
3315                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3316                 ret = NFS_ATTR_FATTR_FSID;
3317         }
3318         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3319                         (unsigned long long)fsid->major,
3320                         (unsigned long long)fsid->minor);
3321         return ret;
3322 out_overflow:
3323         print_overflow_msg(__func__, xdr);
3324         return -EIO;
3325 }
3326 
3327 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3328 {
3329         __be32 *p;
3330 
3331         *res = 60;
3332         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3333                 return -EIO;
3334         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3335                 p = xdr_inline_decode(xdr, 4);
3336                 if (unlikely(!p))
3337                         goto out_overflow;
3338                 *res = be32_to_cpup(p);
3339                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3340         }
3341         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3342         return 0;
3343 out_overflow:
3344         print_overflow_msg(__func__, xdr);
3345         return -EIO;
3346 }
3347 
3348 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3349 {
3350         __be32 *p;
3351 
3352         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3353                 return -EIO;
3354         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3355                 p = xdr_inline_decode(xdr, 4);
3356                 if (unlikely(!p))
3357                         goto out_overflow;
3358                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3359                 *res = -be32_to_cpup(p);
3360         }
3361         return 0;
3362 out_overflow:
3363         print_overflow_msg(__func__, xdr);
3364         return -EIO;
3365 }
3366 
3367 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3368 {
3369         __be32 *p;
3370         int len;
3371 
3372         if (fh != NULL)
3373                 memset(fh, 0, sizeof(*fh));
3374 
3375         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3376                 return -EIO;
3377         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3378                 p = xdr_inline_decode(xdr, 4);
3379                 if (unlikely(!p))
3380                         goto out_overflow;
3381                 len = be32_to_cpup(p);
3382                 if (len > NFS4_FHSIZE)
3383                         return -EIO;
3384                 p = xdr_inline_decode(xdr, len);
3385                 if (unlikely(!p))
3386                         goto out_overflow;
3387                 if (fh != NULL) {
3388                         memcpy(fh->data, p, len);
3389                         fh->size = len;
3390                 }
3391                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3392         }
3393         return 0;
3394 out_overflow:
3395         print_overflow_msg(__func__, xdr);
3396         return -EIO;
3397 }
3398 
3399 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3400 {
3401         __be32 *p;
3402 
3403         *res = 0;
3404         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3405                 return -EIO;
3406         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3407                 p = xdr_inline_decode(xdr, 4);
3408                 if (unlikely(!p))
3409                         goto out_overflow;
3410                 *res = be32_to_cpup(p);
3411                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3412         }
3413         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3414         return 0;
3415 out_overflow:
3416         print_overflow_msg(__func__, xdr);
3417         return -EIO;
3418 }
3419 
3420 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3421 {
3422         __be32 *p;
3423         int ret = 0;
3424 
3425         *fileid = 0;
3426         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3427                 return -EIO;
3428         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3429                 p = xdr_inline_decode(xdr, 8);
3430                 if (unlikely(!p))
3431                         goto out_overflow;
3432                 xdr_decode_hyper(p, fileid);
3433                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3434                 ret = NFS_ATTR_FATTR_FILEID;
3435         }
3436         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3437         return ret;
3438 out_overflow:
3439         print_overflow_msg(__func__, xdr);
3440         return -EIO;
3441 }
3442 
3443 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3444 {
3445         __be32 *p;
3446         int ret = 0;
3447 
3448         *fileid = 0;
3449         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3450                 return -EIO;
3451         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3452                 p = xdr_inline_decode(xdr, 8);
3453                 if (unlikely(!p))
3454                         goto out_overflow;
3455                 xdr_decode_hyper(p, fileid);
3456                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3457                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3458         }
3459         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3460         return ret;
3461 out_overflow:
3462         print_overflow_msg(__func__, xdr);
3463         return -EIO;
3464 }
3465 
3466 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3467 {
3468         __be32 *p;
3469         int status = 0;
3470 
3471         *res = 0;
3472         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3473                 return -EIO;
3474         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3475                 p = xdr_inline_decode(xdr, 8);
3476                 if (unlikely(!p))
3477                         goto out_overflow;
3478                 xdr_decode_hyper(p, res);
3479                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3480         }
3481         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3482         return status;
3483 out_overflow:
3484         print_overflow_msg(__func__, xdr);
3485         return -EIO;
3486 }
3487 
3488 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3489 {
3490         __be32 *p;
3491         int status = 0;
3492 
3493         *res = 0;
3494         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3495                 return -EIO;
3496         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3497                 p = xdr_inline_decode(xdr, 8);
3498                 if (unlikely(!p))
3499                         goto out_overflow;
3500                 xdr_decode_hyper(p, res);
3501                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3502         }
3503         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3504         return status;
3505 out_overflow:
3506         print_overflow_msg(__func__, xdr);
3507         return -EIO;
3508 }
3509 
3510 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3511 {
3512         __be32 *p;
3513         int status = 0;
3514 
3515         *res = 0;
3516         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3517                 return -EIO;
3518         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3519                 p = xdr_inline_decode(xdr, 8);
3520                 if (unlikely(!p))
3521                         goto out_overflow;
3522                 xdr_decode_hyper(p, res);
3523                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3524         }
3525         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3526         return status;
3527 out_overflow:
3528         print_overflow_msg(__func__, xdr);
3529         return -EIO;
3530 }
3531 
3532 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3533 {
3534         u32 n;
3535         __be32 *p;
3536         int status = 0;
3537 
3538         p = xdr_inline_decode(xdr, 4);
3539         if (unlikely(!p))
3540                 goto out_overflow;
3541         n = be32_to_cpup(p);
3542         if (n == 0)
3543                 goto root_path;
3544         dprintk("pathname4: ");
3545         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3546                 dprintk("cannot parse %d components in path\n", n);
3547                 goto out_eio;
3548         }
3549         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3550                 struct nfs4_string *component = &path->components[path->ncomponents];
3551                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3552                 if (unlikely(status != 0))
3553                         goto out_eio;
3554                 ifdebug (XDR)
3555                         pr_cont("%s%.*s ",
3556                                 (path->ncomponents != n ? "/ " : ""),
3557                                 component->len, component->data);
3558         }
3559 out:
3560         return status;
3561 root_path:
3562 /* a root pathname is sent as a zero component4 */
3563         path->ncomponents = 1;
3564         path->components[0].len=0;
3565         path->components[0].data=NULL;
3566         dprintk("pathname4: /\n");
3567         goto out;
3568 out_eio:
3569         dprintk(" status %d", status);
3570         status = -EIO;
3571         goto out;
3572 out_overflow:
3573         print_overflow_msg(__func__, xdr);
3574         return -EIO;
3575 }
3576 
3577 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3578 {
3579         int n;
3580         __be32 *p;
3581         int status = -EIO;
3582 
3583         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3584                 goto out;
3585         status = 0;
3586         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3587                 goto out;
3588         status = -EIO;
3589         /* Ignore borken servers that return unrequested attrs */
3590         if (unlikely(res == NULL))
3591                 goto out;
3592         dprintk("%s: fsroot:\n", __func__);
3593         status = decode_pathname(xdr, &res->fs_path);
3594         if (unlikely(status != 0))
3595                 goto out;
3596         p = xdr_inline_decode(xdr, 4);
3597         if (unlikely(!p))
3598                 goto out_overflow;
3599         n = be32_to_cpup(p);
3600         if (n <= 0)
3601                 goto out_eio;
3602         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3603                 u32 m;
3604                 struct nfs4_fs_location *loc;
3605 
3606                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3607                         break;
3608                 loc = &res->locations[res->nlocations];
3609                 p = xdr_inline_decode(xdr, 4);
3610                 if (unlikely(!p))
3611                         goto out_overflow;
3612                 m = be32_to_cpup(p);
3613 
3614                 dprintk("%s: servers:\n", __func__);
3615                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3616                         struct nfs4_string *server;
3617 
3618                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3619                                 unsigned int i;
3620                                 dprintk("%s: using first %u of %u servers "
3621                                         "returned for location %u\n",
3622                                                 __func__,
3623                                                 NFS4_FS_LOCATION_MAXSERVERS,
3624                                                 m, res->nlocations);
3625                                 for (i = loc->nservers; i < m; i++) {
3626                                         unsigned int len;
3627                                         char *data;
3628                                         status = decode_opaque_inline(xdr, &len, &data);
3629                                         if (unlikely(status != 0))
3630                                                 goto out_eio;
3631                                 }
3632                                 break;
3633                         }
3634                         server = &loc->servers[loc->nservers];
3635                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3636                         if (unlikely(status != 0))
3637                                 goto out_eio;
3638                         dprintk("%s ", server->data);
3639                 }
3640                 status = decode_pathname(xdr, &loc->rootpath);
3641                 if (unlikely(status != 0))
3642                         goto out_eio;
3643         }
3644         if (res->nlocations != 0)
3645                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3646 out:
3647         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3648         return status;
3649 out_overflow:
3650         print_overflow_msg(__func__, xdr);
3651 out_eio:
3652         status = -EIO;
3653         goto out;
3654 }
3655 
3656 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3657 {
3658         __be32 *p;
3659         int status = 0;
3660 
3661         *res = 0;
3662         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3663                 return -EIO;
3664         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3665                 p = xdr_inline_decode(xdr, 8);
3666                 if (unlikely(!p))
3667                         goto out_overflow;
3668                 xdr_decode_hyper(p, res);
3669                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3670         }
3671         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3672         return status;
3673 out_overflow:
3674         print_overflow_msg(__func__, xdr);
3675         return -EIO;
3676 }
3677 
3678 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3679 {
3680         __be32 *p;
3681         int status = 0;
3682 
3683         *maxlink = 1;
3684         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3685                 return -EIO;
3686         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3687                 p = xdr_inline_decode(xdr, 4);
3688                 if (unlikely(!p))
3689                         goto out_overflow;
3690                 *maxlink = be32_to_cpup(p);
3691                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3692         }
3693         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3694         return status;
3695 out_overflow:
3696         print_overflow_msg(__func__, xdr);
3697         return -EIO;
3698 }
3699 
3700 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3701 {
3702         __be32 *p;
3703         int status = 0;
3704 
3705         *maxname = 1024;
3706         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3707                 return -EIO;
3708         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3709                 p = xdr_inline_decode(xdr, 4);
3710                 if (unlikely(!p))
3711                         goto out_overflow;
3712                 *maxname = be32_to_cpup(p);
3713                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3714         }
3715         dprintk("%s: maxname=%u\n", __func__, *maxname);
3716         return status;
3717 out_overflow:
3718         print_overflow_msg(__func__, xdr);
3719         return -EIO;
3720 }
3721 
3722 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3723 {
3724         __be32 *p;
3725         int status = 0;
3726 
3727         *res = 1024;
3728         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3729                 return -EIO;
3730         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3731                 uint64_t maxread;
3732                 p = xdr_inline_decode(xdr, 8);
3733                 if (unlikely(!p))
3734                         goto out_overflow;
3735                 xdr_decode_hyper(p, &maxread);
3736                 if (maxread > 0x7FFFFFFF)
3737                         maxread = 0x7FFFFFFF;
3738                 *res = (uint32_t)maxread;
3739                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3740         }
3741         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3742         return status;
3743 out_overflow:
3744         print_overflow_msg(__func__, xdr);
3745         return -EIO;
3746 }
3747 
3748 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3749 {
3750         __be32 *p;
3751         int status = 0;
3752 
3753         *res = 1024;
3754         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3755                 return -EIO;
3756         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3757                 uint64_t maxwrite;
3758                 p = xdr_inline_decode(xdr, 8);
3759                 if (unlikely(!p))
3760                         goto out_overflow;
3761                 xdr_decode_hyper(p, &maxwrite);
3762                 if (maxwrite > 0x7FFFFFFF)
3763                         maxwrite = 0x7FFFFFFF;
3764                 *res = (uint32_t)maxwrite;
3765                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3766         }
3767         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3768         return status;
3769 out_overflow:
3770         print_overflow_msg(__func__, xdr);
3771         return -EIO;
3772 }
3773 
3774 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3775 {
3776         uint32_t tmp;
3777         __be32 *p;
3778         int ret = 0;
3779 
3780         *mode = 0;
3781         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3782                 return -EIO;
3783         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3784                 p = xdr_inline_decode(xdr, 4);
3785                 if (unlikely(!p))
3786                         goto out_overflow;
3787                 tmp = be32_to_cpup(p);
3788                 *mode = tmp & ~S_IFMT;
3789                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3790                 ret = NFS_ATTR_FATTR_MODE;
3791         }
3792         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3793         return ret;
3794 out_overflow:
3795         print_overflow_msg(__func__, xdr);
3796         return -EIO;
3797 }
3798 
3799 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3800 {
3801         __be32 *p;
3802         int ret = 0;
3803 
3804         *nlink = 1;
3805         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3806                 return -EIO;
3807         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3808                 p = xdr_inline_decode(xdr, 4);
3809                 if (unlikely(!p))
3810                         goto out_overflow;
3811                 *nlink = be32_to_cpup(p);
3812                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3813                 ret = NFS_ATTR_FATTR_NLINK;
3814         }
3815         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3816         return ret;
3817 out_overflow:
3818         print_overflow_msg(__func__, xdr);
3819         return -EIO;
3820 }
3821 
3822 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3823                 const struct nfs_server *server, kuid_t *uid,
3824                 struct nfs4_string *owner_name)
3825 {
3826         uint32_t len;
3827         __be32 *p;
3828         int ret = 0;
3829 
3830         *uid = make_kuid(&init_user_ns, -2);
3831         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3832                 return -EIO;
3833         if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3834                 p = xdr_inline_decode(xdr, 4);
3835                 if (unlikely(!p))
3836                         goto out_overflow;
3837                 len = be32_to_cpup(p);
3838                 p = xdr_inline_decode(xdr, len);
3839                 if (unlikely(!p))
3840                         goto out_overflow;
3841                 if (owner_name != NULL) {
3842                         owner_name->data = kmemdup(p, len, GFP_NOWAIT);
3843                         if (owner_name->data != NULL) {
3844                                 owner_name->len = len;
3845                                 ret = NFS_ATTR_FATTR_OWNER_NAME;
3846                         }
3847                 } else if (len < XDR_MAX_NETOBJ) {
3848                         if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
3849                                 ret = NFS_ATTR_FATTR_OWNER;
3850                         else
3851                                 dprintk("%s: nfs_map_name_to_uid failed!\n",
3852                                                 __func__);
3853                 } else
3854                         dprintk("%s: name too long (%u)!\n",
3855                                         __func__, len);
3856                 bitmap[1] &= ~FATTR4_WORD1_OWNER;
3857         }
3858         dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3859         return ret;
3860 out_overflow:
3861         print_overflow_msg(__func__, xdr);
3862         return -EIO;
3863 }
3864 
3865 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3866                 const struct nfs_server *server, kgid_t *gid,
3867                 struct nfs4_string *group_name)
3868 {
3869         uint32_t len;
3870         __be32 *p;
3871         int ret = 0;
3872 
3873         *gid = make_kgid(&init_user_ns, -2);
3874         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3875                 return -EIO;
3876         if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3877                 p = xdr_inline_decode(xdr, 4);
3878                 if (unlikely(!p))
3879                         goto out_overflow;
3880                 len = be32_to_cpup(p);
3881                 p = xdr_inline_decode(xdr, len);
3882                 if (unlikely(!p))
3883                         goto out_overflow;
3884                 if (group_name != NULL) {
3885                         group_name->data = kmemdup(p, len, GFP_NOWAIT);
3886                         if (group_name->data != NULL) {
3887                                 group_name->len = len;
3888                                 ret = NFS_ATTR_FATTR_GROUP_NAME;
3889                         }
3890                 } else if (len < XDR_MAX_NETOBJ) {
3891                         if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
3892                                 ret = NFS_ATTR_FATTR_GROUP;
3893                         else
3894                                 dprintk("%s: nfs_map_group_to_gid failed!\n",
3895                                                 __func__);
3896                 } else
3897                         dprintk("%s: name too long (%u)!\n",
3898                                         __func__, len);
3899                 bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3900         }
3901         dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3902         return ret;
3903 out_overflow:
3904         print_overflow_msg(__func__, xdr);
3905         return -EIO;
3906 }
3907 
3908 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3909 {
3910         uint32_t major = 0, minor = 0;
3911         __be32 *p;
3912         int ret = 0;
3913 
3914         *rdev = MKDEV(0,0);
3915         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3916                 return -EIO;
3917         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3918                 dev_t tmp;
3919 
3920                 p = xdr_inline_decode(xdr, 8);
3921                 if (unlikely(!p))
3922                         goto out_overflow;
3923                 major = be32_to_cpup(p++);
3924                 minor = be32_to_cpup(p);
3925                 tmp = MKDEV(major, minor);
3926                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3927                         *rdev = tmp;
3928                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3929                 ret = NFS_ATTR_FATTR_RDEV;
3930         }
3931         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3932         return ret;
3933 out_overflow:
3934         print_overflow_msg(__func__, xdr);
3935         return -EIO;
3936 }
3937 
3938 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3939 {
3940         __be32 *p;
3941         int status = 0;
3942 
3943         *res = 0;
3944         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3945                 return -EIO;
3946         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3947                 p = xdr_inline_decode(xdr, 8);
3948                 if (unlikely(!p))
3949                         goto out_overflow;
3950                 xdr_decode_hyper(p, res);
3951                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3952         }
3953         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3954         return status;
3955 out_overflow:
3956         print_overflow_msg(__func__, xdr);
3957         return -EIO;
3958 }
3959 
3960 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3961 {
3962         __be32 *p;
3963         int status = 0;
3964 
3965         *res = 0;
3966         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3967                 return -EIO;
3968         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3969                 p = xdr_inline_decode(xdr, 8);
3970                 if (unlikely(!p))
3971                         goto out_overflow;
3972                 xdr_decode_hyper(p, res);
3973                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3974         }
3975         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3976         return status;
3977 out_overflow:
3978         print_overflow_msg(__func__, xdr);
3979         return -EIO;
3980 }
3981 
3982 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3983 {
3984         __be32 *p;
3985         int status = 0;
3986 
3987         *res = 0;
3988         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
3989                 return -EIO;
3990         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3991                 p = xdr_inline_decode(xdr, 8);
3992                 if (unlikely(!p))
3993                         goto out_overflow;
3994                 xdr_decode_hyper(p, res);
3995                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
3996         }
3997         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
3998         return status;
3999 out_overflow:
4000         print_overflow_msg(__func__, xdr);
4001         return -EIO;
4002 }
4003 
4004 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4005 {
4006         __be32 *p;
4007         int ret = 0;
4008 
4009         *used = 0;
4010         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4011                 return -EIO;
4012         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4013                 p = xdr_inline_decode(xdr, 8);
4014                 if (unlikely(!p))
4015                         goto out_overflow;
4016                 xdr_decode_hyper(p, used);
4017                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4018                 ret = NFS_ATTR_FATTR_SPACE_USED;
4019         }
4020         dprintk("%s: space used=%Lu\n", __func__,
4021                         (unsigned long long)*used);
4022         return ret;
4023 out_overflow:
4024         print_overflow_msg(__func__, xdr);
4025         return -EIO;
4026 }
4027 
4028 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4029 {
4030         __be32 *p;
4031         uint64_t sec;
4032         uint32_t nsec;
4033 
4034         p = xdr_inline_decode(xdr, 12);
4035         if (unlikely(!p))
4036                 goto out_overflow;
4037         p = xdr_decode_hyper(p, &sec);
4038         nsec = be32_to_cpup(p);
4039         time->tv_sec = (time_t)sec;
4040         time->tv_nsec = (long)nsec;
4041         return 0;
4042 out_overflow:
4043         print_overflow_msg(__func__, xdr);
4044         return -EIO;
4045 }
4046 
4047 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4048 {
4049         int status = 0;
4050 
4051         time->tv_sec = 0;
4052         time->tv_nsec = 0;
4053         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4054                 return -EIO;
4055         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4056                 status = decode_attr_time(xdr, time);
4057                 if (status == 0)
4058                         status = NFS_ATTR_FATTR_ATIME;
4059                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4060         }
4061         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4062         return status;
4063 }
4064 
4065 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4066 {
4067         int status = 0;
4068 
4069         time->tv_sec = 0;
4070         time->tv_nsec = 0;
4071         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4072                 return -EIO;
4073         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4074                 status = decode_attr_time(xdr, time);
4075                 if (status == 0)
4076                         status = NFS_ATTR_FATTR_CTIME;
4077                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4078         }
4079         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4080         return status;
4081 }
4082 
4083 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4084                                   struct timespec *time)
4085 {
4086         int status = 0;
4087 
4088         time->tv_sec = 0;
4089         time->tv_nsec = 0;
4090         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4091                 return -EIO;
4092         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4093                 status = decode_attr_time(xdr, time);
4094                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4095         }
4096         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4097                 (long)time->tv_nsec);
4098         return status;
4099 }
4100 
4101 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4102                                         struct nfs4_label *label)
4103 {
4104         uint32_t pi = 0;
4105         uint32_t lfs = 0;
4106         __u32 len;
4107         __be32 *p;
4108         int status = 0;
4109 
4110         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4111                 return -EIO;
4112         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4113                 p = xdr_inline_decode(xdr, 4);
4114                 if (unlikely(!p))
4115                         goto out_overflow;
4116                 lfs = be32_to_cpup(p++);
4117                 p = xdr_inline_decode(xdr, 4);
4118                 if (unlikely(!p))
4119                         goto out_overflow;
4120                 pi = be32_to_cpup(p++);
4121                 p = xdr_inline_decode(xdr, 4);
4122                 if (unlikely(!p))
4123                         goto out_overflow;
4124                 len = be32_to_cpup(p++);
4125                 p = xdr_inline_decode(xdr, len);
4126                 if (unlikely(!p))
4127                         goto out_overflow;
4128                 if (len < NFS4_MAXLABELLEN) {
4129                         if (label) {
4130                                 memcpy(label->label, p, len);
4131                                 label->len = len;
4132                                 label->pi = pi;
4133                                 label->lfs = lfs;
4134                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4135                         }
4136                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4137                 } else
4138                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4139                                         __func__, len);
4140         }
4141         if (label && label->label)
4142                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4143                         (char *)label->label, label->len, label->pi, label->lfs);
4144         return status;
4145 
4146 out_overflow:
4147         print_overflow_msg(__func__, xdr);
4148         return -EIO;
4149 }
4150 
4151 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4152 {
4153         int status = 0;
4154 
4155         time->tv_sec = 0;
4156         time->tv_nsec = 0;
4157         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4158                 return -EIO;
4159         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4160                 status = decode_attr_time(xdr, time);
4161                 if (status == 0)
4162                         status = NFS_ATTR_FATTR_MTIME;
4163                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4164         }
4165         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4166         return status;
4167 }
4168 
4169 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4170 {
4171         unsigned int attrwords = XDR_QUADLEN(attrlen);
4172         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4173 
4174         if (unlikely(attrwords != nwords)) {
4175                 dprintk("%s: server returned incorrect attribute length: "
4176                         "%u %c %u\n",
4177                                 __func__,
4178                                 attrwords << 2,
4179                                 (attrwords < nwords) ? '<' : '>',
4180                                 nwords << 2);
4181                 return -EIO;
4182         }
4183         return 0;
4184 }
4185 
4186 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4187 {
4188         __be32 *p;
4189 
4190         p = xdr_inline_decode(xdr, 20);
4191         if (unlikely(!p))
4192                 goto out_overflow;
4193         cinfo->atomic = be32_to_cpup(p++);
4194         p = xdr_decode_hyper(p, &cinfo->before);
4195         xdr_decode_hyper(p, &cinfo->after);
4196         return 0;
4197 out_overflow:
4198         print_overflow_msg(__func__, xdr);
4199         return -EIO;
4200 }
4201 
4202 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4203 {
4204         __be32 *p;
4205         uint32_t supp, acc;
4206         int status;
4207 
4208         status = decode_op_hdr(xdr, OP_ACCESS);
4209         if (status)
4210                 return status;
4211         p = xdr_inline_decode(xdr, 8);
4212         if (unlikely(!p))
4213                 goto out_overflow;
4214         supp = be32_to_cpup(p++);
4215         acc = be32_to_cpup(p);
4216         *supported = supp;
4217         *access = acc;
4218         return 0;
4219 out_overflow:
4220         print_overflow_msg(__func__, xdr);
4221         return -EIO;
4222 }
4223 
4224 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4225 {
4226         __be32 *p;
4227 
4228         p = xdr_inline_decode(xdr, len);
4229         if (likely(p)) {
4230                 memcpy(buf, p, len);
4231                 return 0;
4232         }
4233         print_overflow_msg(__func__, xdr);
4234         return -EIO;
4235 }
4236 
4237 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4238 {
4239         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4240 }
4241 
4242 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4243 {
4244         int status;
4245 
4246         status = decode_op_hdr(xdr, OP_CLOSE);
4247         if (status != -EIO)
4248                 nfs_increment_open_seqid(status, res->seqid);
4249         if (!status)
4250                 status = decode_stateid(xdr, &res->stateid);
4251         return status;
4252 }
4253 
4254 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4255 {
4256         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4257 }
4258 
4259 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4260 {
4261         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4262 }
4263 
4264 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4265 {
4266         int status;
4267 
4268         status = decode_op_hdr(xdr, OP_COMMIT);
4269         if (!status)
4270                 status = decode_write_verifier(xdr, &res->verf->verifier);
4271         return status;
4272 }
4273 
4274 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4275 {
4276         __be32 *p;
4277         uint32_t bmlen;
4278         int status;
4279 
4280         status = decode_op_hdr(xdr, OP_CREATE);
4281         if (status)
4282                 return status;
4283         if ((status = decode_change_info(xdr, cinfo)))
4284                 return status;
4285         p = xdr_inline_decode(xdr, 4);
4286         if (unlikely(!p))
4287                 goto out_overflow;
4288         bmlen = be32_to_cpup(p);
4289         p = xdr_inline_decode(xdr, bmlen << 2);
4290         if (likely(p))
4291                 return 0;
4292 out_overflow:
4293         print_overflow_msg(__func__, xdr);
4294         return -EIO;
4295 }
4296 
4297 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4298 {
4299         unsigned int savep;
4300         uint32_t attrlen, bitmap[3] = {0};
4301         int status;
4302 
4303         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4304                 goto xdr_error;
4305         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4306                 goto xdr_error;
4307         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4308                 goto xdr_error;
4309         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4310                 goto xdr_error;
4311         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4312                                                  &res->fh_expire_type)) != 0)
4313                 goto xdr_error;
4314         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4315                 goto xdr_error;
4316         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4317                 goto xdr_error;
4318         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4319                 goto xdr_error;
4320         status = verify_attr_len(xdr, savep, attrlen);
4321 xdr_error:
4322         dprintk("%s: xdr returned %d!\n", __func__, -status);
4323         return status;
4324 }
4325 
4326 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4327 {
4328         unsigned int savep;
4329         uint32_t attrlen, bitmap[3] = {0};
4330         int status;
4331 
4332         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4333                 goto xdr_error;
4334         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4335                 goto xdr_error;
4336         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4337                 goto xdr_error;
4338 
4339         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4340                 goto xdr_error;
4341         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4342                 goto xdr_error;
4343         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4344                 goto xdr_error;
4345         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4346                 goto xdr_error;
4347         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4348                 goto xdr_error;
4349         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4350                 goto xdr_error;
4351 
4352         status = verify_attr_len(xdr, savep, attrlen);
4353 xdr_error:
4354         dprintk("%s: xdr returned %d!\n", __func__, -status);
4355         return status;
4356 }
4357 
4358 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4359 {
4360         unsigned int savep;
4361         uint32_t attrlen, bitmap[3] = {0};
4362         int status;
4363 
4364         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4365                 goto xdr_error;
4366         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4367                 goto xdr_error;
4368         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4369                 goto xdr_error;
4370 
4371         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4372                 goto xdr_error;
4373         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4374                 goto xdr_error;
4375 
4376         status = verify_attr_len(xdr, savep, attrlen);
4377 xdr_error:
4378         dprintk("%s: xdr returned %d!\n", __func__, -status);
4379         return status;
4380 }
4381 
4382 static int decode_threshold_hint(struct xdr_stream *xdr,
4383                                   uint32_t *bitmap,
4384                                   uint64_t *res,
4385                                   uint32_t hint_bit)
4386 {
4387         __be32 *p;
4388 
4389         *res = 0;
4390         if (likely(bitmap[0] & hint_bit)) {
4391                 p = xdr_inline_decode(xdr, 8);
4392                 if (unlikely(!p))
4393                         goto out_overflow;
4394                 xdr_decode_hyper(p, res);
4395         }
4396         return 0;
4397 out_overflow:
4398         print_overflow_msg(__func__, xdr);
4399         return -EIO;
4400 }
4401 
4402 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4403                                         struct nfs4_threshold *res)
4404 {
4405         __be32 *p;
4406         unsigned int savep;
4407         uint32_t bitmap[3] = {0,}, attrlen;
4408         int status;
4409 
4410         /* layout type */
4411         p = xdr_inline_decode(xdr, 4);
4412         if (unlikely(!p)) {
4413                 print_overflow_msg(__func__, xdr);
4414                 return -EIO;
4415         }
4416         res->l_type = be32_to_cpup(p);
4417 
4418         /* thi_hintset bitmap */
4419         status = decode_attr_bitmap(xdr, bitmap);
4420         if (status < 0)
4421                 goto xdr_error;
4422 
4423         /* thi_hintlist length */
4424         status = decode_attr_length(xdr, &attrlen, &savep);
4425         if (status < 0)
4426                 goto xdr_error;
4427         /* thi_hintlist */
4428         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4429         if (status < 0)
4430                 goto xdr_error;
4431         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4432         if (status < 0)
4433                 goto xdr_error;
4434         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4435                                        THRESHOLD_RD_IO);
4436         if (status < 0)
4437                 goto xdr_error;
4438         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4439                                        THRESHOLD_WR_IO);
4440         if (status < 0)
4441                 goto xdr_error;
4442 
4443         status = verify_attr_len(xdr, savep, attrlen);
4444         res->bm = bitmap[0];
4445 
4446         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4447                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4448                 res->wr_io_sz);
4449 xdr_error:
4450         dprintk("%s ret=%d!\n", __func__, status);
4451         return status;
4452 }
4453 
4454 /*
4455  * Thresholds on pNFS direct I/O vrs MDS I/O
4456  */
4457 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4458                                     uint32_t *bitmap,
4459                                     struct nfs4_threshold *res)
4460 {
4461         __be32 *p;
4462         int status = 0;
4463         uint32_t num;
4464 
4465         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4466                 return -EIO;
4467         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4468                 /* Did the server return an unrequested attribute? */
4469                 if (unlikely(res == NULL))
4470                         return -EREMOTEIO;
4471                 p = xdr_inline_decode(xdr, 4);
4472                 if (unlikely(!p))
4473                         goto out_overflow;
4474                 num = be32_to_cpup(p);
4475                 if (num == 0)
4476                         return 0;
4477                 if (num > 1)
4478                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4479                                 "drivers per filesystem not supported\n",
4480                                 __func__);
4481 
4482                 status = decode_first_threshold_item4(xdr, res);
4483                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4484         }
4485         return status;
4486 out_overflow:
4487         print_overflow_msg(__func__, xdr);
4488         return -EIO;
4489 }
4490 
4491 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4492                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4493                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4494                 const struct nfs_server *server)
4495 {
4496         int status;
4497         umode_t fmode = 0;
4498         uint32_t type;
4499         int32_t err;
4500 
4501         status = decode_attr_type(xdr, bitmap, &type);
4502         if (status < 0)
4503                 goto xdr_error;
4504         fattr->mode = 0;
4505         if (status != 0) {
4506                 fattr->mode |= nfs_type2fmt[type];
4507                 fattr->valid |= status;
4508         }
4509 
4510         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4511         if (status < 0)
4512                 goto xdr_error;
4513         fattr->valid |= status;
4514 
4515         status = decode_attr_size(xdr, bitmap, &fattr->size);
4516         if (status < 0)
4517                 goto xdr_error;
4518         fattr->valid |= status;
4519 
4520         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4521         if (status < 0)
4522                 goto xdr_error;
4523         fattr->valid |= status;
4524 
4525         err = 0;
4526         status = decode_attr_error(xdr, bitmap, &err);
4527         if (status < 0)
4528                 goto xdr_error;
4529 
4530         status = decode_attr_filehandle(xdr, bitmap, fh);
4531         if (status < 0)
4532                 goto xdr_error;
4533 
4534         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4535         if (status < 0)
4536                 goto xdr_error;
4537         fattr->valid |= status;
4538 
4539         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4540         if (status < 0)
4541                 goto xdr_error;
4542         fattr->valid |= status;
4543 
4544         status = decode_attr_mode(xdr, bitmap, &fmode);
4545         if (status < 0)
4546                 goto xdr_error;
4547         if (status != 0) {
4548                 fattr->mode |= fmode;
4549                 fattr->valid |= status;
4550         }
4551 
4552         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4553         if (status < 0)
4554                 goto xdr_error;
4555         fattr->valid |= status;
4556 
4557         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4558         if (status < 0)
4559                 goto xdr_error;
4560         fattr->valid |= status;
4561 
4562         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4563         if (status < 0)
4564                 goto xdr_error;
4565         fattr->valid |= status;
4566 
4567         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4568         if (status < 0)
4569                 goto xdr_error;
4570         fattr->valid |= status;
4571 
4572         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4573         if (status < 0)
4574                 goto xdr_error;
4575         fattr->valid |= status;
4576 
4577         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4578         if (status < 0)
4579                 goto xdr_error;
4580         fattr->valid |= status;
4581 
4582         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4583         if (status < 0)
4584                 goto xdr_error;
4585         fattr->valid |= status;
4586 
4587         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4588         if (status < 0)
4589                 goto xdr_error;
4590         fattr->valid |= status;
4591 
4592         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4593         if (status < 0)
4594                 goto xdr_error;
4595         fattr->valid |= status;
4596 
4597         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4598         if (status < 0)
4599                 goto xdr_error;
4600 
4601         if (label) {
4602                 status = decode_attr_security_label(xdr, bitmap, label);
4603                 if (status < 0)
4604                         goto xdr_error;
4605                 fattr->valid |= status;
4606         }
4607 
4608 xdr_error:
4609         dprintk("%s: xdr returned %d\n", __func__, -status);
4610         return status;
4611 }
4612 
4613 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4614                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4615                 struct nfs4_label *label, const struct nfs_server *server)
4616 {
4617         unsigned int savep;
4618         uint32_t attrlen,
4619                  bitmap[3] = {0};
4620         int status;
4621 
4622         status = decode_op_hdr(xdr, OP_GETATTR);
4623         if (status < 0)
4624                 goto xdr_error;
4625 
4626         status = decode_attr_bitmap(xdr, bitmap);
4627         if (status < 0)
4628                 goto xdr_error;
4629 
4630         status = decode_attr_length(xdr, &attrlen, &savep);
4631         if (status < 0)
4632                 goto xdr_error;
4633 
4634         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4635                                         label, server);
4636         if (status < 0)
4637                 goto xdr_error;
4638 
4639         status = verify_attr_len(xdr, savep, attrlen);
4640 xdr_error:
4641         dprintk("%s: xdr returned %d\n", __func__, -status);
4642         return status;
4643 }
4644 
4645 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4646                 struct nfs4_label *label, const struct nfs_server *server)
4647 {
4648         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4649 }
4650 
4651 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4652                 const struct nfs_server *server)
4653 {
4654         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4655 }
4656 
4657 /*
4658  * Decode potentially multiple layout types. Currently we only support
4659  * one layout driver per file system.
4660  */
4661 static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
4662                                          uint32_t *layouttype)
4663 {
4664         __be32 *p;
4665         int num;
4666 
4667         p = xdr_inline_decode(xdr, 4);
4668         if (unlikely(!p))
4669                 goto out_overflow;
4670         num = be32_to_cpup(p);
4671 
4672         /* pNFS is not supported by the underlying file system */
4673         if (num == 0) {
4674                 *layouttype = 0;
4675                 return 0;
4676         }
4677         if (num > 1)
4678                 printk(KERN_INFO "NFS: %s: Warning: Multiple pNFS layout "
4679                         "drivers per filesystem not supported\n", __func__);
4680 
4681         /* Decode and set first layout type, move xdr->p past unused types */
4682         p = xdr_inline_decode(xdr, num * 4);
4683         if (unlikely(!p))
4684                 goto out_overflow;
4685         *layouttype = be32_to_cpup(p);
4686         return 0;
4687 out_overflow:
4688         print_overflow_msg(__func__, xdr);
4689         return -EIO;
4690 }
4691 
4692 /*
4693  * The type of file system exported.
4694  * Note we must ensure that layouttype is set in any non-error case.
4695  */
4696 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4697                                 uint32_t *layouttype)
4698 {
4699         int status = 0;
4700 
4701         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4702         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4703                 return -EIO;
4704         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4705                 status = decode_first_pnfs_layout_type(xdr, layouttype);
4706                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4707         } else
4708                 *layouttype = 0;
4709         return status;
4710 }
4711 
4712 /*
4713  * The prefered block size for layout directed io
4714  */
4715 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4716                                       uint32_t *res)
4717 {
4718         __be32 *p;
4719 
4720         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4721         *res = 0;
4722         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4723                 p = xdr_inline_decode(xdr, 4);
4724                 if (unlikely(!p)) {
4725                         print_overflow_msg(__func__, xdr);
4726                         return -EIO;
4727                 }
4728                 *res = be32_to_cpup(p);
4729                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4730         }
4731         return 0;
4732 }
4733 
4734 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4735 {
4736         unsigned int savep;
4737         uint32_t attrlen, bitmap[3];
4738         int status;
4739 
4740         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4741                 goto xdr_error;
4742         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4743                 goto xdr_error;
4744         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4745                 goto xdr_error;
4746 
4747         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4748 
4749         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4750                 goto xdr_error;
4751         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4752                 goto xdr_error;
4753         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4754                 goto xdr_error;
4755         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4756         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4757                 goto xdr_error;
4758         fsinfo->wtpref = fsinfo->wtmax;
4759         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4760         if (status != 0)
4761                 goto xdr_error;
4762         status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4763         if (status != 0)
4764                 goto xdr_error;
4765         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4766         if (status)
4767                 goto xdr_error;
4768 
4769         status = verify_attr_len(xdr, savep, attrlen);
4770 xdr_error:
4771         dprintk("%s: xdr returned %d!\n", __func__, -status);
4772         return status;
4773 }
4774 
4775 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4776 {
4777         __be32 *p;
4778         uint32_t len;
4779         int status;
4780 
4781         /* Zero handle first to allow comparisons */
4782         memset(fh, 0, sizeof(*fh));
4783 
4784         status = decode_op_hdr(xdr, OP_GETFH);
4785         if (status)
4786                 return status;
4787 
4788         p = xdr_inline_decode(xdr, 4);
4789         if (unlikely(!p))
4790                 goto out_overflow;
4791         len = be32_to_cpup(p);
4792         if (len > NFS4_FHSIZE)
4793                 return -EIO;
4794         fh->size = len;
4795         p = xdr_inline_decode(xdr, len);
4796         if (unlikely(!p))
4797                 goto out_overflow;
4798         memcpy(fh->data, p, len);
4799         return 0;
4800 out_overflow:
4801         print_overflow_msg(__func__, xdr);
4802         return -EIO;
4803 }
4804 
4805 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4806 {
4807         int status;
4808 
4809         status = decode_op_hdr(xdr, OP_LINK);
4810         if (status)
4811                 return status;
4812         return decode_change_info(xdr, cinfo);
4813 }
4814 
4815 /*
4816  * We create the owner, so we know a proper owner.id length is 4.
4817  */
4818 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4819 {
4820         uint64_t offset, length, clientid;
4821         __be32 *p;
4822         uint32_t namelen, type;
4823 
4824         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4825         if (unlikely(!p))
4826                 goto out_overflow;
4827         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4828         p = xdr_decode_hyper(p, &length);
4829         type = be32_to_cpup(p++); /* 4 byte read */
4830         if (fl != NULL) { /* manipulate file lock */
4831                 fl->fl_start = (loff_t)offset;
4832                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4833                 if (length == ~(uint64_t)0)
4834                         fl->fl_end = OFFSET_MAX;
4835                 fl->fl_type = F_WRLCK;
4836                 if (type & 1)
4837                         fl->fl_type = F_RDLCK;
4838                 fl->fl_pid = 0;
4839         }
4840         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4841         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4842         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4843         if (likely(p))
4844                 return -NFS4ERR_DENIED;
4845 out_overflow:
4846         print_overflow_msg(__func__, xdr);
4847         return -EIO;
4848 }
4849 
4850 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4851 {
4852         int status;
4853 
4854         status = decode_op_hdr(xdr, OP_LOCK);
4855         if (status == -EIO)
4856                 goto out;
4857         if (status == 0) {
4858                 status = decode_stateid(xdr, &res->stateid);
4859                 if (unlikely(status))
4860                         goto out;
4861         } else if (status == -NFS4ERR_DENIED)
4862                 status = decode_lock_denied(xdr, NULL);
4863         if (res->open_seqid != NULL)
4864                 nfs_increment_open_seqid(status, res->open_seqid);
4865         nfs_increment_lock_seqid(status, res->lock_seqid);
4866 out:
4867         return status;
4868 }
4869 
4870 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4871 {
4872         int status;
4873         status = decode_op_hdr(xdr, OP_LOCKT);
4874         if (status == -NFS4ERR_DENIED)
4875                 return decode_lock_denied(xdr, res->denied);
4876         return status;
4877 }
4878 
4879 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4880 {
4881         int status;
4882 
4883         status = decode_op_hdr(xdr, OP_LOCKU);
4884         if (status != -EIO)
4885                 nfs_increment_lock_seqid(status, res->seqid);
4886         if (status == 0)
4887                 status = decode_stateid(xdr, &res->stateid);
4888         return status;
4889 }
4890 
4891 static int decode_release_lockowner(struct xdr_stream *xdr)
4892 {
4893         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4894 }
4895 
4896 static int decode_lookup(struct xdr_stream *xdr)
4897 {
4898         return decode_op_hdr(xdr, OP_LOOKUP);
4899 }
4900 
4901 /* This is too sick! */
4902 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4903 {
4904         __be32 *p;
4905         uint32_t limit_type, nblocks, blocksize;
4906 
4907         p = xdr_inline_decode(xdr, 12);
4908         if (unlikely(!p))
4909                 goto out_overflow;
4910         limit_type = be32_to_cpup(p++);
4911         switch (limit_type) {
4912         case 1:
4913                 xdr_decode_hyper(p, maxsize);
4914                 break;
4915         case 2:
4916                 nblocks = be32_to_cpup(p++);
4917                 blocksize = be32_to_cpup(p);
4918                 *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4919         }
4920         return 0;
4921 out_overflow:
4922         print_overflow_msg(__func__, xdr);
4923         return -EIO;
4924 }
4925 
4926 static int decode_rw_delegation(struct xdr_stream *xdr,
4927                 uint32_t delegation_type,
4928                 struct nfs_openres *res)
4929 {
4930         __be32 *p;
4931         int status;
4932 
4933         status = decode_stateid(xdr, &res->delegation);
4934         if (unlikely(status))
4935                 return status;
4936         p = xdr_inline_decode(xdr, 4);
4937         if (unlikely(!p))
4938                 goto out_overflow;
4939         res->do_recall = be32_to_cpup(p);
4940 
4941         switch (delegation_type) {
4942         case NFS4_OPEN_DELEGATE_READ:
4943                 res->delegation_type = FMODE_READ;
4944                 break;
4945         case NFS4_OPEN_DELEGATE_WRITE:
4946                 res->delegation_type = FMODE_WRITE|FMODE_READ;
4947                 if (decode_space_limit(xdr, &res->maxsize) < 0)
4948                                 return -EIO;
4949         }
4950         return decode_ace(xdr, NULL, res->server->nfs_client);
4951 out_overflow:
4952         print_overflow_msg(__func__, xdr);
4953         return -EIO;
4954 }
4955 
4956 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4957 {
4958         __be32 *p;
4959         uint32_t why_no_delegation;
4960 
4961         p = xdr_inline_decode(xdr, 4);
4962         if (unlikely(!p))
4963                 goto out_overflow;
4964         why_no_delegation = be32_to_cpup(p);
4965         switch (why_no_delegation) {
4966                 case WND4_CONTENTION:
4967                 case WND4_RESOURCE:
4968                         xdr_inline_decode(xdr, 4);
4969                         /* Ignore for now */
4970         }
4971         return 0;
4972 out_overflow:
4973         print_overflow_msg(__func__, xdr);
4974         return -EIO;
4975 }
4976 
4977 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4978 {
4979         __be32 *p;
4980         uint32_t delegation_type;
4981 
4982         p = xdr_inline_decode(xdr, 4);
4983         if (unlikely(!p))
4984                 goto out_overflow;
4985         delegation_type = be32_to_cpup(p);
4986         res->delegation_type = 0;
4987         switch (delegation_type) {
4988         case NFS4_OPEN_DELEGATE_NONE:
4989                 return 0;
4990         case NFS4_OPEN_DELEGATE_READ:
4991         case NFS4_OPEN_DELEGATE_WRITE:
4992                 return decode_rw_delegation(xdr, delegation_type, res);
4993         case NFS4_OPEN_DELEGATE_NONE_EXT:
4994                 return decode_no_delegation(xdr, res);
4995         }
4996         return -EIO;
4997 out_overflow:
4998         print_overflow_msg(__func__, xdr);
4999         return -EIO;
5000 }
5001 
5002 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5003 {
5004         __be32 *p;
5005         uint32_t savewords, bmlen, i;
5006         int status;
5007 
5008         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5009                 return status;
5010         nfs_increment_open_seqid(status, res->seqid);
5011         if (status)
5012                 return status;
5013         status = decode_stateid(xdr, &res->stateid);
5014         if (unlikely(status))
5015                 return status;
5016 
5017         decode_change_info(xdr, &res->cinfo);
5018 
5019         p = xdr_inline_decode(xdr, 8);
5020         if (unlikely(!p))
5021                 goto out_overflow;
5022         res->rflags = be32_to_cpup(p++);
5023         bmlen = be32_to_cpup(p);
5024         if (bmlen > 10)
5025                 goto xdr_error;
5026 
5027         p = xdr_inline_decode(xdr, bmlen << 2);
5028         if (unlikely(!p))
5029                 goto out_overflow;
5030         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5031         for (i = 0; i < savewords; ++i)
5032                 res->attrset[i] = be32_to_cpup(p++);
5033         for (; i < NFS4_BITMAP_SIZE; i++)
5034                 res->attrset[i] = 0;
5035 
5036         return decode_delegation(xdr, res);
5037 xdr_error:
5038         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5039         return -EIO;
5040 out_overflow:
5041         print_overflow_msg(__func__, xdr);
5042         return -EIO;
5043 }
5044 
5045 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5046 {
5047         int status;
5048 
5049         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5050         if (status != -EIO)
5051                 nfs_increment_open_seqid(status, res->seqid);
5052         if (!status)
5053                 status = decode_stateid(xdr, &res->stateid);
5054         return status;
5055 }
5056 
5057 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5058 {
5059         int status;
5060 
5061         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5062         if (status != -EIO)
5063                 nfs_increment_open_seqid(status, res->seqid);
5064         if (!status)
5065                 status = decode_stateid(xdr, &res->stateid);
5066         return status;
5067 }
5068 
5069 static int decode_putfh(struct xdr_stream *xdr)
5070 {
5071         return decode_op_hdr(xdr, OP_PUTFH);
5072 }
5073 
5074 static int decode_putrootfh(struct xdr_stream *xdr)
5075 {
5076         return decode_op_hdr(xdr, OP_PUTROOTFH);
5077 }
5078 
5079 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5080                        struct nfs_pgio_res *res)
5081 {
5082         __be32 *p;
5083         uint32_t count, eof, recvd;
5084         int status;
5085 
5086         status = decode_op_hdr(xdr, OP_READ);
5087         if (status)
5088                 return status;
5089         p = xdr_inline_decode(xdr, 8);
5090         if (unlikely(!p))
5091                 goto out_overflow;
5092         eof = be32_to_cpup(p++);
5093         count = be32_to_cpup(p);
5094         recvd = xdr_read_pages(xdr, count);
5095         if (count > recvd) {
5096                 dprintk("NFS: server cheating in read reply: "
5097                                 "count %u > recvd %u\n", count, recvd);
5098                 count = recvd;
5099                 eof = 0;
5100         }
5101         res->eof = eof;
5102         res->count = count;
5103         return 0;
5104 out_overflow:
5105         print_overflow_msg(__func__, xdr);
5106         return -EIO;
5107 }
5108 
5109 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5110 {
5111         int             status;
5112         __be32          verf[2];
5113 
5114         status = decode_op_hdr(xdr, OP_READDIR);
5115         if (!status)
5116                 status = decode_verifier(xdr, readdir->verifier.data);
5117         if (unlikely(status))
5118                 return status;
5119         memcpy(verf, readdir->verifier.data, sizeof(verf));
5120         dprintk("%s: verifier = %08x:%08x\n",
5121                         __func__, verf[0], verf[1]);
5122         return xdr_read_pages(xdr, xdr->buf->page_len);
5123 }
5124 
5125 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5126 {
5127         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5128         u32 len, recvd;
5129         __be32 *p;
5130         int status;
5131 
5132         status = decode_op_hdr(xdr, OP_READLINK);
5133         if (status)
5134                 return status;
5135 
5136         /* Convert length of symlink */
5137         p = xdr_inline_decode(xdr, 4);
5138         if (unlikely(!p))
5139                 goto out_overflow;
5140         len = be32_to_cpup(p);
5141         if (len >= rcvbuf->page_len || len <= 0) {
5142                 dprintk("nfs: server returned giant symlink!\n");
5143                 return -ENAMETOOLONG;
5144         }
5145         recvd = xdr_read_pages(xdr, len);
5146         if (recvd < len) {
5147                 dprintk("NFS: server cheating in readlink reply: "
5148                                 "count %u > recvd %u\n", len, recvd);
5149                 return -EIO;
5150         }
5151         /*
5152          * The XDR encode routine has set things up so that
5153          * the link text will be copied directly into the
5154          * buffer.  We just have to do overflow-checking,
5155          * and and null-terminate the text (the VFS expects
5156          * null-termination).
5157          */
5158         xdr_terminate_string(rcvbuf, len);
5159         return 0;
5160 out_overflow:
5161         print_overflow_msg(__func__, xdr);
5162         return -EIO;
5163 }
5164 
5165 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5166 {
5167         int status;
5168 
5169         status = decode_op_hdr(xdr, OP_REMOVE);
5170         if (status)
5171                 goto out;
5172         status = decode_change_info(xdr, cinfo);
5173 out:
5174         return status;
5175 }
5176 
5177 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5178               struct nfs4_change_info *new_cinfo)
5179 {
5180         int status;
5181 
5182         status = decode_op_hdr(xdr, OP_RENAME);
5183         if (status)
5184                 goto out;
5185         if ((status = decode_change_info(xdr, old_cinfo)))
5186                 goto out;
5187         status = decode_change_info(xdr, new_cinfo);
5188 out:
5189         return status;
5190 }
5191 
5192 static int decode_renew(struct xdr_stream *xdr)
5193 {
5194         return decode_op_hdr(xdr, OP_RENEW);
5195 }
5196 
5197 static int
5198 decode_restorefh(struct xdr_stream *xdr)
5199 {
5200         return decode_op_hdr(xdr, OP_RESTOREFH);
5201 }
5202 
5203 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5204                          struct nfs_getaclres *res)
5205 {
5206         unsigned int savep;
5207         uint32_t attrlen,
5208                  bitmap[3] = {0};
5209         int status;
5210         unsigned int pg_offset;
5211 
5212         res->acl_len = 0;
5213         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5214                 goto out;
5215 
5216         xdr_enter_page(xdr, xdr->buf->page_len);
5217 
5218         /* Calculate the offset of the page data */
5219         pg_offset = xdr->buf->head[0].iov_len;
5220 
5221         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5222                 goto out;
5223         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5224                 goto out;
5225 
5226         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5227                 return -EIO;
5228         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5229 
5230                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5231                  * are stored with the acl data to handle the problem of
5232                  * variable length bitmaps.*/
5233                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5234                 res->acl_len = attrlen;
5235 
5236                 /* Check for receive buffer overflow */
5237                 if (res->acl_len > (xdr->nwords << 2) ||
5238                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5239                         res->acl_flags |= NFS4_ACL_TRUNC;
5240                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5241                                         attrlen, xdr->nwords << 2);
5242                 }
5243         } else
5244                 status = -EOPNOTSUPP;
5245 
5246 out:
5247         return status;
5248 }
5249 
5250 static int
5251 decode_savefh(struct xdr_stream *xdr)
5252 {
5253         return decode_op_hdr(xdr, OP_SAVEFH);
5254 }
5255 
5256 static int decode_setattr(struct xdr_stream *xdr)
5257 {
5258         __be32 *p;
5259         uint32_t bmlen;
5260         int status;
5261 
5262         status = decode_op_hdr(xdr, OP_SETATTR);
5263         if (status)
5264                 return status;
5265         p = xdr_inline_decode(xdr, 4);
5266         if (unlikely(!p))
5267                 goto out_overflow;
5268         bmlen = be32_to_cpup(p);
5269         p = xdr_inline_decode(xdr, bmlen << 2);
5270         if (likely(p))
5271                 return 0;
5272 out_overflow:
5273         print_overflow_msg(__func__, xdr);
5274         return -EIO;
5275 }
5276 
5277 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5278 {
5279         __be32 *p;
5280         uint32_t opnum;
5281         int32_t nfserr;
5282 
5283         p = xdr_inline_decode(xdr, 8);
5284         if (unlikely(!p))
5285                 goto out_overflow;
5286         opnum = be32_to_cpup(p++);
5287         if (opnum != OP_SETCLIENTID) {
5288                 dprintk("nfs: decode_setclientid: Server returned operation"
5289                         " %d\n", opnum);
5290                 return -EIO;
5291         }
5292         nfserr = be32_to_cpup(p);
5293         if (nfserr == NFS_OK) {
5294                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5295                 if (unlikely(!p))
5296                         goto out_overflow;
5297                 p = xdr_decode_hyper(p, &res->clientid);
5298                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5299         } else if (nfserr == NFSERR_CLID_INUSE) {
5300                 uint32_t len;
5301 
5302                 /* skip netid string */
5303                 p = xdr_inline_decode(xdr, 4);
5304                 if (unlikely(!p))
5305                         goto out_overflow;
5306                 len = be32_to_cpup(p);
5307                 p = xdr_inline_decode(xdr, len);
5308                 if (unlikely(!p))
5309                         goto out_overflow;
5310 
5311                 /* skip uaddr string */
5312                 p = xdr_inline_decode(xdr, 4);
5313                 if (unlikely(!p))
5314                         goto out_overflow;
5315                 len = be32_to_cpup(p);
5316                 p = xdr_inline_decode(xdr, len);
5317                 if (unlikely(!p))
5318                         goto out_overflow;
5319                 return -NFSERR_CLID_INUSE;
5320         } else
5321                 return nfs4_stat_to_errno(nfserr);
5322 
5323         return 0;
5324 out_overflow:
5325         print_overflow_msg(__func__, xdr);
5326         return -EIO;
5327 }
5328 
5329 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5330 {
5331         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5332 }
5333 
5334 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5335 {
5336         __be32 *p;
5337         int status;
5338 
5339         status = decode_op_hdr(xdr, OP_WRITE);
5340         if (status)
5341                 return status;
5342 
5343         p = xdr_inline_decode(xdr, 8);
5344         if (unlikely(!p))
5345                 goto out_overflow;
5346         res->count = be32_to_cpup(p++);
5347         res->verf->committed = be32_to_cpup(p++);
5348         return decode_write_verifier(xdr, &res->verf->verifier);
5349 out_overflow:
5350         print_overflow_msg(__func__, xdr);
5351         return -EIO;
5352 }
5353 
5354 static int decode_delegreturn(struct xdr_stream *xdr)
5355 {
5356         return decode_op_hdr(xdr, OP_DELEGRETURN);
5357 }
5358 
5359 static int decode_secinfo_gss(struct xdr_stream *xdr,
5360                               struct nfs4_secinfo4 *flavor)
5361 {
5362         u32 oid_len;
5363         __be32 *p;
5364 
5365         p = xdr_inline_decode(xdr, 4);
5366         if (unlikely(!p))
5367                 goto out_overflow;
5368         oid_len = be32_to_cpup(p);
5369         if (oid_len > GSS_OID_MAX_LEN)
5370                 goto out_err;
5371 
5372         p = xdr_inline_decode(xdr, oid_len);
5373         if (unlikely(!p))
5374                 goto out_overflow;
5375         memcpy(flavor->flavor_info.oid.data, p, oid_len);
5376         flavor->flavor_info.oid.len = oid_len;
5377 
5378         p = xdr_inline_decode(xdr, 8);
5379         if (unlikely(!p))
5380                 goto out_overflow;
5381         flavor->flavor_info.qop = be32_to_cpup(p++);
5382         flavor->flavor_info.service = be32_to_cpup(p);
5383 
5384         return 0;
5385 
5386 out_overflow:
5387         print_overflow_msg(__func__, xdr);
5388         return -EIO;
5389 out_err:
5390         return -EINVAL;
5391 }
5392 
5393 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5394 {
5395         struct nfs4_secinfo4 *sec_flavor;
5396         unsigned int i, num_flavors;
5397         int status;
5398         __be32 *p;
5399 
5400         p = xdr_inline_decode(xdr, 4);
5401         if (unlikely(!p))
5402                 goto out_overflow;
5403 
5404         res->flavors->num_flavors = 0;
5405         num_flavors = be32_to_cpup(p);
5406 
5407         for (i = 0; i < num_flavors; i++) {
5408                 sec_flavor = &res->flavors->flavors[i];
5409                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5410                         break;
5411 
5412                 p = xdr_inline_decode(xdr, 4);
5413                 if (unlikely(!p))
5414                         goto out_overflow;
5415                 sec_flavor->flavor = be32_to_cpup(p);
5416 
5417                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5418                         status = decode_secinfo_gss(xdr, sec_flavor);
5419                         if (status)
5420                                 goto out;
5421                 }
5422                 res->flavors->num_flavors++;
5423         }
5424 
5425         status = 0;
5426 out:
5427         return status;
5428 out_overflow:
5429         print_overflow_msg(__func__, xdr);
5430         return -EIO;
5431 }
5432 
5433 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5434 {
5435         int status = decode_op_hdr(xdr, OP_SECINFO);
5436         if (status)
5437                 return status;
5438         return decode_secinfo_common(xdr, res);
5439 }
5440 
5441 #if defined(CONFIG_NFS_V4_1)
5442 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5443 {
5444         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5445         if (status)
5446                 return status;
5447         return decode_secinfo_common(xdr, res);
5448 }
5449 
5450 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5451 {
5452         __be32 *p;
5453         uint32_t bitmap_words;
5454         unsigned int i;
5455 
5456         p = xdr_inline_decode(xdr, 4);
5457         bitmap_words = be32_to_cpup(p++);
5458         if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5459                 return -EIO;
5460         p = xdr_inline_decode(xdr, 4 * bitmap_words);
5461         for (i = 0; i < bitmap_words; i++)
5462                 op_map->u.words[i] = be32_to_cpup(p++);
5463 
5464         return 0;
5465 }
5466 
5467 static int decode_exchange_id(struct xdr_stream *xdr,
5468                               struct nfs41_exchange_id_res *res)
5469 {
5470         __be32 *p;
5471         uint32_t dummy;
5472         char *dummy_str;
5473         int status;
5474         uint32_t impl_id_count;
5475 
5476         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5477         if (status)
5478                 return status;
5479 
5480         p = xdr_inline_decode(xdr, 8);
5481         if (unlikely(!p))
5482                 goto out_overflow;
5483         xdr_decode_hyper(p, &res->clientid);
5484         p = xdr_inline_decode(xdr, 12);
5485         if (unlikely(!p))
5486                 goto out_overflow;
5487         res->seqid = be32_to_cpup(p++);
5488         res->flags = be32_to_cpup(p++);
5489 
5490         res->state_protect.how = be32_to_cpup(p);
5491         switch (res->state_protect.how) {
5492         case SP4_NONE:
5493                 break;
5494         case SP4_MACH_CRED:
5495                 status = decode_op_map(xdr, &res->state_protect.enforce);
5496                 if (status)
5497                         return status;
5498                 status = decode_op_map(xdr, &res->state_protect.allow);
5499                 if (status)
5500                         return status;
5501                 break;
5502         default:
5503                 WARN_ON_ONCE(1);
5504                 return -EIO;
5505         }
5506 
5507         /* server_owner4.so_minor_id */
5508         p = xdr_inline_decode(xdr, 8);
5509         if (unlikely(!p))
5510                 goto out_overflow;
5511         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5512 
5513         /* server_owner4.so_major_id */
5514         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5515         if (unlikely(status))
5516                 return status;
5517         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5518                 return -EIO;
5519         memcpy(res->server_owner->major_id, dummy_str, dummy);
5520         res->server_owner->major_id_sz = dummy;
5521 
5522         /* server_scope4 */
5523         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5524         if (unlikely(status))
5525                 return status;
5526         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5527                 return -EIO;
5528         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5529         res->server_scope->server_scope_sz = dummy;
5530 
5531         /* Implementation Id */
5532         p = xdr_inline_decode(xdr, 4);
5533         if (unlikely(!p))
5534                 goto out_overflow;
5535         impl_id_count = be32_to_cpup(p++);
5536 
5537         if (impl_id_count) {
5538                 /* nii_domain */
5539                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5540                 if (unlikely(status))
5541                         return status;
5542                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5543                         return -EIO;
5544                 memcpy(res->impl_id->domain, dummy_str, dummy);
5545 
5546                 /* nii_name */
5547                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5548                 if (unlikely(status))
5549                         return status;
5550                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5551                         return -EIO;
5552                 memcpy(res->impl_id->name, dummy_str, dummy);
5553 
5554                 /* nii_date */
5555                 p = xdr_inline_decode(xdr, 12);
5556                 if (unlikely(!p))
5557                         goto out_overflow;
5558                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5559                 res->impl_id->date.nseconds = be32_to_cpup(p);
5560 
5561                 /* if there's more than one entry, ignore the rest */
5562         }
5563         return 0;
5564 out_overflow:
5565         print_overflow_msg(__func__, xdr);
5566         return -EIO;
5567 }
5568 
5569 static int decode_chan_attrs(struct xdr_stream *xdr,
5570                              struct nfs4_channel_attrs *attrs)
5571 {
5572         __be32 *p;
5573         u32 nr_attrs, val;
5574 
5575         p = xdr_inline_decode(xdr, 28);
5576         if (unlikely(!p))
5577                 goto out_overflow;
5578         val = be32_to_cpup(p++);        /* headerpadsz */
5579         if (val)
5580                 return -EINVAL;         /* no support for header padding yet */
5581         attrs->max_rqst_sz = be32_to_cpup(p++);
5582         attrs->max_resp_sz = be32_to_cpup(p++);
5583         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5584         attrs->max_ops = be32_to_cpup(p++);
5585         attrs->max_reqs = be32_to_cpup(p++);
5586         nr_attrs = be32_to_cpup(p);
5587         if (unlikely(nr_attrs > 1)) {
5588                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5589                         "count %u\n", __func__, nr_attrs);
5590                 return -EINVAL;
5591         }
5592         if (nr_attrs == 1) {
5593                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5594                 if (unlikely(!p))
5595                         goto out_overflow;
5596         }
5597         return 0;
5598 out_overflow:
5599         print_overflow_msg(__func__, xdr);
5600         return -EIO;
5601 }
5602 
5603 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5604 {
5605         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5606 }
5607 
5608 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5609                                 struct nfs41_bind_conn_to_session_res *res)
5610 {
5611         __be32 *p;
5612         int status;
5613 
5614         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5615         if (!status)
5616                 status = decode_sessionid(xdr, &res->sessionid);
5617         if (unlikely(status))
5618                 return status;
5619 
5620         /* dir flags, rdma mode bool */
5621         p = xdr_inline_decode(xdr, 8);
5622         if (unlikely(!p))
5623                 goto out_overflow;
5624 
5625         res->dir = be32_to_cpup(p++);
5626         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5627                 return -EIO;
5628         if (be32_to_cpup(p) == 0)
5629                 res->use_conn_in_rdma_mode = false;
5630         else
5631                 res->use_conn_in_rdma_mode = true;
5632 
5633         return 0;
5634 out_overflow:
5635         print_overflow_msg(__func__, xdr);
5636         return -EIO;
5637 }
5638 
5639 static int decode_create_session(struct xdr_stream *xdr,
5640                                  struct nfs41_create_session_res *res)
5641 {
5642         __be32 *p;
5643         int status;
5644 
5645         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5646         if (!status)
5647                 status = decode_sessionid(xdr, &res->sessionid);
5648         if (unlikely(status))
5649                 return status;
5650 
5651         /* seqid, flags */
5652