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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 "pnfs.h"
 60 #include "netns.h"
 61 
 62 #define NFSDBG_FACILITY         NFSDBG_XDR
 63 
 64 /* Mapping from NFS error code to "errno" error code. */
 65 #define errno_NFSERR_IO         EIO
 66 
 67 static int nfs4_stat_to_errno(int);
 68 
 69 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
 70 #ifdef DEBUG
 71 #define NFS4_MAXTAGLEN          20
 72 #else
 73 #define NFS4_MAXTAGLEN          0
 74 #endif
 75 
 76 /* lock,open owner id:
 77  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
 78  */
 79 #define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
 80 #define lock_owner_id_maxsz     (1 + 1 + 4)
 81 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 82 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 83 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 84 #define op_encode_hdr_maxsz     (1)
 85 #define op_decode_hdr_maxsz     (2)
 86 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 87 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 88 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 89 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 90 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
 91                                 (NFS4_FHSIZE >> 2))
 92 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
 93 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
 94 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
 95 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
 96 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
 97                                 ((3+NFS4_FHSIZE) >> 2))
 98 #define nfs4_fattr_bitmap_maxsz 4
 99 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
100 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
101 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
102 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
103 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
104 /* We support only one layout type per file system */
105 #define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
106 /* This is based on getfattr, which uses the most attributes: */
107 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
108                                 3 + 3 + 3 + nfs4_owner_maxsz + \
109                                 nfs4_group_maxsz + decode_mdsthreshold_maxsz))
110 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
111                                 nfs4_fattr_value_maxsz)
112 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
113 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
114                                  1 + 2 + 1 + \
115                                 nfs4_owner_maxsz + \
116                                 nfs4_group_maxsz + \
117                                 4 + 4)
118 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
119 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
120 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
121 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
122 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
123 /* The 5 accounts for the PNFS attributes, and assumes that at most three
124  * layout types will be returned.
125  */
126 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
127                                  nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
128 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
129 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
130 #define encode_setclientid_maxsz \
131                                 (op_encode_hdr_maxsz + \
132                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
133                                 XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
134                                 1 /* sc_prog */ + \
135                                 XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
136                                 XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
137                                 1) /* sc_cb_ident */
138 #define decode_setclientid_maxsz \
139                                 (op_decode_hdr_maxsz + \
140                                 2 + \
141                                 1024) /* large value for CLID_INUSE */
142 #define encode_setclientid_confirm_maxsz \
143                                 (op_encode_hdr_maxsz + \
144                                 3 + (NFS4_VERIFIER_SIZE >> 2))
145 #define decode_setclientid_confirm_maxsz \
146                                 (op_decode_hdr_maxsz)
147 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
148 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
149 #define encode_share_access_maxsz \
150                                 (2)
151 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
152 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
153 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
154 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
155                                 2 + encode_share_access_maxsz + 2 + \
156                                 open_owner_id_maxsz + \
157                                 encode_opentype_maxsz + \
158                                 encode_claim_null_maxsz)
159 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
160 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
161                                 decode_ace_maxsz)
162 #define decode_change_info_maxsz        (5)
163 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
164                                 decode_stateid_maxsz + \
165                                 decode_change_info_maxsz + 1 + \
166                                 nfs4_fattr_bitmap_maxsz + \
167                                 decode_delegation_maxsz)
168 #define encode_open_confirm_maxsz \
169                                 (op_encode_hdr_maxsz + \
170                                  encode_stateid_maxsz + 1)
171 #define decode_open_confirm_maxsz \
172                                 (op_decode_hdr_maxsz + \
173                                  decode_stateid_maxsz)
174 #define encode_open_downgrade_maxsz \
175                                 (op_encode_hdr_maxsz + \
176                                  encode_stateid_maxsz + 1 + \
177                                  encode_share_access_maxsz)
178 #define decode_open_downgrade_maxsz \
179                                 (op_decode_hdr_maxsz + \
180                                  decode_stateid_maxsz)
181 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
182                                  1 + encode_stateid_maxsz)
183 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
184                                  decode_stateid_maxsz)
185 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
186                                  encode_stateid_maxsz + \
187                                  encode_attrs_maxsz)
188 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
189                                  nfs4_fattr_bitmap_maxsz)
190 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
191                                  encode_stateid_maxsz + 3)
192 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
193 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
194                                  2 + encode_verifier_maxsz + 5)
195 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
196                                  decode_verifier_maxsz)
197 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
198 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
199 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
200                                  encode_stateid_maxsz + 4)
201 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
202                                  2 + decode_verifier_maxsz)
203 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
204 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
205                                  decode_verifier_maxsz)
206 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
207                                 nfs4_name_maxsz)
208 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
209                                  decode_change_info_maxsz)
210 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
211                                 2 * nfs4_name_maxsz)
212 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
213                                  decode_change_info_maxsz + \
214                                  decode_change_info_maxsz)
215 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
216                                 nfs4_name_maxsz)
217 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
218 #define encode_lockowner_maxsz  (7)
219 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
220                                  7 + \
221                                  1 + encode_stateid_maxsz + 1 + \
222                                  encode_lockowner_maxsz)
223 #define decode_lock_denied_maxsz \
224                                 (8 + decode_lockowner_maxsz)
225 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
226                                  decode_lock_denied_maxsz)
227 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
228                                 encode_lockowner_maxsz)
229 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
230                                  decode_lock_denied_maxsz)
231 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
232                                  encode_stateid_maxsz + \
233                                  4)
234 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
235                                  decode_stateid_maxsz)
236 #define encode_release_lockowner_maxsz \
237                                 (op_encode_hdr_maxsz + \
238                                  encode_lockowner_maxsz)
239 #define decode_release_lockowner_maxsz \
240                                 (op_decode_hdr_maxsz)
241 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
242 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
243 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
244                                 1 + nfs4_name_maxsz + \
245                                 1 + \
246                                 nfs4_fattr_maxsz)
247 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
248 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
249                                 1 + 2 + nfs4_name_maxsz + \
250                                 encode_attrs_maxsz)
251 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
252                                 decode_change_info_maxsz + \
253                                 nfs4_fattr_bitmap_maxsz)
254 #define encode_statfs_maxsz     (encode_getattr_maxsz)
255 #define decode_statfs_maxsz     (decode_getattr_maxsz)
256 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
257 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
258 #define encode_getacl_maxsz     (encode_getattr_maxsz)
259 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
260                                  nfs4_fattr_bitmap_maxsz + 1)
261 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
262                                  encode_stateid_maxsz + 3)
263 #define decode_setacl_maxsz     (decode_setattr_maxsz)
264 #define encode_fs_locations_maxsz \
265                                 (encode_getattr_maxsz)
266 #define decode_fs_locations_maxsz \
267                                 (0)
268 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
269 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
270 
271 #if defined(CONFIG_NFS_V4_1)
272 #define NFS4_MAX_MACHINE_NAME_LEN (64)
273 
274 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
275                                 encode_verifier_maxsz + \
276                                 1 /* co_ownerid.len */ + \
277                                 XDR_QUADLEN(NFS4_EXCHANGE_ID_LEN) + \
278                                 1 /* flags */ + \
279                                 1 /* spa_how */ + \
280                                 0 /* SP4_NONE (for now) */ + \
281                                 1 /* implementation id array of size 1 */ + \
282                                 1 /* nii_domain */ + \
283                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
284                                 1 /* nii_name */ + \
285                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
286                                 3 /* nii_date */)
287 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
288                                 2 /* eir_clientid */ + \
289                                 1 /* eir_sequenceid */ + \
290                                 1 /* eir_flags */ + \
291                                 1 /* spr_how */ + \
292                                 0 /* SP4_NONE (for now) */ + \
293                                 2 /* eir_server_owner.so_minor_id */ + \
294                                 /* eir_server_owner.so_major_id<> */ \
295                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
296                                 /* eir_server_scope<> */ \
297                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
298                                 1 /* eir_server_impl_id array length */ + \
299                                 1 /* nii_domain */ + \
300                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
301                                 1 /* nii_name */ + \
302                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
303                                 3 /* nii_date */)
304 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
305 #define decode_channel_attrs_maxsz  (6 + \
306                                      1 /* ca_rdma_ird.len */ + \
307                                      1 /* ca_rdma_ird */)
308 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
309                                      2 /* csa_clientid */ + \
310                                      1 /* csa_sequence */ + \
311                                      1 /* csa_flags */ + \
312                                      encode_channel_attrs_maxsz + \
313                                      encode_channel_attrs_maxsz + \
314                                      1 /* csa_cb_program */ + \
315                                      1 /* csa_sec_parms.len (1) */ + \
316                                      1 /* cb_secflavor (AUTH_SYS) */ + \
317                                      1 /* stamp */ + \
318                                      1 /* machinename.len */ + \
319                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
320                                      1 /* uid */ + \
321                                      1 /* gid */ + \
322                                      1 /* gids.len (0) */)
323 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
324                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
325                                      1 /* csr_sequence */ + \
326                                      1 /* csr_flags */ + \
327                                      decode_channel_attrs_maxsz + \
328                                      decode_channel_attrs_maxsz)
329 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
330                                      /* bctsa_sessid */ \
331                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
332                                      1 /* bctsa_dir */ + \
333                                      1 /* bctsa_use_conn_in_rdma_mode */)
334 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
335                                      /* bctsr_sessid */ \
336                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
337                                      1 /* bctsr_dir */ + \
338                                      1 /* bctsr_use_conn_in_rdma_mode */)
339 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
340 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
341 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
342 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
343 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
344                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
345 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
346                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
347 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
348 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
349 #define encode_getdevicelist_maxsz (op_encode_hdr_maxsz + 4 + \
350                                 encode_verifier_maxsz)
351 #define decode_getdevicelist_maxsz (op_decode_hdr_maxsz + \
352                                 2 /* nfs_cookie4 gdlr_cookie */ + \
353                                 decode_verifier_maxsz \
354                                   /* verifier4 gdlr_verifier */ + \
355                                 1 /* gdlr_deviceid_list count */ + \
356                                 XDR_QUADLEN(NFS4_PNFS_GETDEVLIST_MAXNUM * \
357                                             NFS4_DEVICEID4_SIZE) \
358                                   /* gdlr_deviceid_list */ + \
359                                 1 /* bool gdlr_eof */)
360 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + 4 + \
361                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE))
362 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
363                                 1 /* layout type */ + \
364                                 1 /* opaque devaddr4 length */ + \
365                                   /* devaddr4 payload is read into page */ \
366                                 1 /* notification bitmap length */ + \
367                                 1 /* notification bitmap */)
368 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
369                                 encode_stateid_maxsz)
370 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
371                                 decode_stateid_maxsz + \
372                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
373 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
374                                 2 /* offset */ + \
375                                 2 /* length */ + \
376                                 1 /* reclaim */ + \
377                                 encode_stateid_maxsz + \
378                                 1 /* new offset (true) */ + \
379                                 2 /* last byte written */ + \
380                                 1 /* nt_timechanged (false) */ + \
381                                 1 /* layoutupdate4 layout type */ + \
382                                 1 /* NULL filelayout layoutupdate4 payload */)
383 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
384 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
385                                 encode_stateid_maxsz + \
386                                 1 /* FIXME: opaque lrf_body always empty at the moment */)
387 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
388                                 1 + decode_stateid_maxsz)
389 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
390 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
391 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
392                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
393 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
394 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
395                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
396 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz + 1)
397 #else /* CONFIG_NFS_V4_1 */
398 #define encode_sequence_maxsz   0
399 #define decode_sequence_maxsz   0
400 #endif /* CONFIG_NFS_V4_1 */
401 
402 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
403 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
404 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
405                                 encode_sequence_maxsz + \
406                                 encode_putfh_maxsz + \
407                                 encode_read_maxsz)
408 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
409                                 decode_sequence_maxsz + \
410                                 decode_putfh_maxsz + \
411                                 decode_read_maxsz)
412 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
413                                 encode_sequence_maxsz + \
414                                 encode_putfh_maxsz + \
415                                 encode_readlink_maxsz)
416 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
417                                 decode_sequence_maxsz + \
418                                 decode_putfh_maxsz + \
419                                 decode_readlink_maxsz)
420 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
421                                 encode_sequence_maxsz + \
422                                 encode_putfh_maxsz + \
423                                 encode_readdir_maxsz)
424 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
425                                 decode_sequence_maxsz + \
426                                 decode_putfh_maxsz + \
427                                 decode_readdir_maxsz)
428 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
429                                 encode_sequence_maxsz + \
430                                 encode_putfh_maxsz + \
431                                 encode_write_maxsz + \
432                                 encode_getattr_maxsz)
433 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
434                                 decode_sequence_maxsz + \
435                                 decode_putfh_maxsz + \
436                                 decode_write_maxsz + \
437                                 decode_getattr_maxsz)
438 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
439                                 encode_sequence_maxsz + \
440                                 encode_putfh_maxsz + \
441                                 encode_commit_maxsz)
442 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
443                                 decode_sequence_maxsz + \
444                                 decode_putfh_maxsz + \
445                                 decode_commit_maxsz)
446 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
447                                 encode_sequence_maxsz + \
448                                 encode_putfh_maxsz + \
449                                 encode_open_maxsz + \
450                                 encode_access_maxsz + \
451                                 encode_getfh_maxsz + \
452                                 encode_getattr_maxsz)
453 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
454                                 decode_sequence_maxsz + \
455                                 decode_putfh_maxsz + \
456                                 decode_open_maxsz + \
457                                 decode_access_maxsz + \
458                                 decode_getfh_maxsz + \
459                                 decode_getattr_maxsz)
460 #define NFS4_enc_open_confirm_sz \
461                                 (compound_encode_hdr_maxsz + \
462                                  encode_putfh_maxsz + \
463                                  encode_open_confirm_maxsz)
464 #define NFS4_dec_open_confirm_sz \
465                                 (compound_decode_hdr_maxsz + \
466                                  decode_putfh_maxsz + \
467                                  decode_open_confirm_maxsz)
468 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
469                                         encode_sequence_maxsz + \
470                                         encode_putfh_maxsz + \
471                                         encode_open_maxsz + \
472                                         encode_access_maxsz + \
473                                         encode_getattr_maxsz)
474 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
475                                         decode_sequence_maxsz + \
476                                         decode_putfh_maxsz + \
477                                         decode_open_maxsz + \
478                                         decode_access_maxsz + \
479                                         decode_getattr_maxsz)
480 #define NFS4_enc_open_downgrade_sz \
481                                 (compound_encode_hdr_maxsz + \
482                                  encode_sequence_maxsz + \
483                                  encode_putfh_maxsz + \
484                                  encode_open_downgrade_maxsz + \
485                                  encode_getattr_maxsz)
486 #define NFS4_dec_open_downgrade_sz \
487                                 (compound_decode_hdr_maxsz + \
488                                  decode_sequence_maxsz + \
489                                  decode_putfh_maxsz + \
490                                  decode_open_downgrade_maxsz + \
491                                  decode_getattr_maxsz)
492 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
493                                  encode_sequence_maxsz + \
494                                  encode_putfh_maxsz + \
495                                  encode_close_maxsz + \
496                                  encode_getattr_maxsz)
497 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
498                                  decode_sequence_maxsz + \
499                                  decode_putfh_maxsz + \
500                                  decode_close_maxsz + \
501                                  decode_getattr_maxsz)
502 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
503                                  encode_sequence_maxsz + \
504                                  encode_putfh_maxsz + \
505                                  encode_setattr_maxsz + \
506                                  encode_getattr_maxsz)
507 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
508                                  decode_sequence_maxsz + \
509                                  decode_putfh_maxsz + \
510                                  decode_setattr_maxsz + \
511                                  decode_getattr_maxsz)
512 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
513                                 encode_sequence_maxsz + \
514                                 encode_putfh_maxsz + \
515                                 encode_fsinfo_maxsz)
516 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
517                                 decode_sequence_maxsz + \
518                                 decode_putfh_maxsz + \
519                                 decode_fsinfo_maxsz)
520 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
521                                 encode_renew_maxsz)
522 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
523                                 decode_renew_maxsz)
524 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
525                                 encode_setclientid_maxsz)
526 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
527                                 decode_setclientid_maxsz)
528 #define NFS4_enc_setclientid_confirm_sz \
529                                 (compound_encode_hdr_maxsz + \
530                                 encode_setclientid_confirm_maxsz + \
531                                 encode_putrootfh_maxsz + \
532                                 encode_fsinfo_maxsz)
533 #define NFS4_dec_setclientid_confirm_sz \
534                                 (compound_decode_hdr_maxsz + \
535                                 decode_setclientid_confirm_maxsz + \
536                                 decode_putrootfh_maxsz + \
537                                 decode_fsinfo_maxsz)
538 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
539                                 encode_sequence_maxsz + \
540                                 encode_putfh_maxsz + \
541                                 encode_lock_maxsz)
542 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
543                                 decode_sequence_maxsz + \
544                                 decode_putfh_maxsz + \
545                                 decode_lock_maxsz)
546 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
547                                 encode_sequence_maxsz + \
548                                 encode_putfh_maxsz + \
549                                 encode_lockt_maxsz)
550 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
551                                  decode_sequence_maxsz + \
552                                  decode_putfh_maxsz + \
553                                  decode_lockt_maxsz)
554 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
555                                 encode_sequence_maxsz + \
556                                 encode_putfh_maxsz + \
557                                 encode_locku_maxsz)
558 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
559                                 decode_sequence_maxsz + \
560                                 decode_putfh_maxsz + \
561                                 decode_locku_maxsz)
562 #define NFS4_enc_release_lockowner_sz \
563                                 (compound_encode_hdr_maxsz + \
564                                  encode_lockowner_maxsz)
565 #define NFS4_dec_release_lockowner_sz \
566                                 (compound_decode_hdr_maxsz + \
567                                  decode_lockowner_maxsz)
568 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
569                                 encode_sequence_maxsz + \
570                                 encode_putfh_maxsz + \
571                                 encode_access_maxsz + \
572                                 encode_getattr_maxsz)
573 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
574                                 decode_sequence_maxsz + \
575                                 decode_putfh_maxsz + \
576                                 decode_access_maxsz + \
577                                 decode_getattr_maxsz)
578 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
579                                 encode_sequence_maxsz + \
580                                 encode_putfh_maxsz + \
581                                 encode_getattr_maxsz)
582 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
583                                 decode_sequence_maxsz + \
584                                 decode_putfh_maxsz + \
585                                 decode_getattr_maxsz)
586 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
587                                 encode_sequence_maxsz + \
588                                 encode_putfh_maxsz + \
589                                 encode_lookup_maxsz + \
590                                 encode_getattr_maxsz + \
591                                 encode_getfh_maxsz)
592 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
593                                 decode_sequence_maxsz + \
594                                 decode_putfh_maxsz + \
595                                 decode_lookup_maxsz + \
596                                 decode_getattr_maxsz + \
597                                 decode_getfh_maxsz)
598 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
599                                 encode_sequence_maxsz + \
600                                 encode_putrootfh_maxsz + \
601                                 encode_getattr_maxsz + \
602                                 encode_getfh_maxsz)
603 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
604                                 decode_sequence_maxsz + \
605                                 decode_putrootfh_maxsz + \
606                                 decode_getattr_maxsz + \
607                                 decode_getfh_maxsz)
608 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
609                                 encode_sequence_maxsz + \
610                                 encode_putfh_maxsz + \
611                                 encode_remove_maxsz)
612 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
613                                 decode_sequence_maxsz + \
614                                 decode_putfh_maxsz + \
615                                 decode_remove_maxsz)
616 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
617                                 encode_sequence_maxsz + \
618                                 encode_putfh_maxsz + \
619                                 encode_savefh_maxsz + \
620                                 encode_putfh_maxsz + \
621                                 encode_rename_maxsz)
622 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
623                                 decode_sequence_maxsz + \
624                                 decode_putfh_maxsz + \
625                                 decode_savefh_maxsz + \
626                                 decode_putfh_maxsz + \
627                                 decode_rename_maxsz)
628 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
629                                 encode_sequence_maxsz + \
630                                 encode_putfh_maxsz + \
631                                 encode_savefh_maxsz + \
632                                 encode_putfh_maxsz + \
633                                 encode_link_maxsz + \
634                                 encode_restorefh_maxsz + \
635                                 encode_getattr_maxsz)
636 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
637                                 decode_sequence_maxsz + \
638                                 decode_putfh_maxsz + \
639                                 decode_savefh_maxsz + \
640                                 decode_putfh_maxsz + \
641                                 decode_link_maxsz + \
642                                 decode_restorefh_maxsz + \
643                                 decode_getattr_maxsz)
644 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
645                                 encode_sequence_maxsz + \
646                                 encode_putfh_maxsz + \
647                                 encode_symlink_maxsz + \
648                                 encode_getattr_maxsz + \
649                                 encode_getfh_maxsz)
650 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
651                                 decode_sequence_maxsz + \
652                                 decode_putfh_maxsz + \
653                                 decode_symlink_maxsz + \
654                                 decode_getattr_maxsz + \
655                                 decode_getfh_maxsz)
656 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
657                                 encode_sequence_maxsz + \
658                                 encode_putfh_maxsz + \
659                                 encode_create_maxsz + \
660                                 encode_getfh_maxsz + \
661                                 encode_getattr_maxsz)
662 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
663                                 decode_sequence_maxsz + \
664                                 decode_putfh_maxsz + \
665                                 decode_create_maxsz + \
666                                 decode_getfh_maxsz + \
667                                 decode_getattr_maxsz)
668 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
669                                 encode_sequence_maxsz + \
670                                 encode_putfh_maxsz + \
671                                 encode_getattr_maxsz)
672 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
673                                 decode_sequence_maxsz + \
674                                 decode_putfh_maxsz + \
675                                 decode_getattr_maxsz)
676 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
677                                 encode_sequence_maxsz + \
678                                 encode_putfh_maxsz + \
679                                 encode_statfs_maxsz)
680 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
681                                 decode_sequence_maxsz + \
682                                 decode_putfh_maxsz + \
683                                 decode_statfs_maxsz)
684 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
685                                 encode_sequence_maxsz + \
686                                 encode_putfh_maxsz + \
687                                 encode_getattr_maxsz)
688 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
689                                 decode_sequence_maxsz + \
690                                 decode_putfh_maxsz + \
691                                 decode_getattr_maxsz)
692 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
693                                 encode_sequence_maxsz + \
694                                 encode_putfh_maxsz + \
695                                 encode_delegreturn_maxsz + \
696                                 encode_getattr_maxsz)
697 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
698                                 decode_sequence_maxsz + \
699                                 decode_delegreturn_maxsz + \
700                                 decode_getattr_maxsz)
701 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
702                                 encode_sequence_maxsz + \
703                                 encode_putfh_maxsz + \
704                                 encode_getacl_maxsz)
705 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
706                                 decode_sequence_maxsz + \
707                                 decode_putfh_maxsz + \
708                                 decode_getacl_maxsz)
709 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
710                                 encode_sequence_maxsz + \
711                                 encode_putfh_maxsz + \
712                                 encode_setacl_maxsz)
713 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
714                                 decode_sequence_maxsz + \
715                                 decode_putfh_maxsz + \
716                                 decode_setacl_maxsz)
717 #define NFS4_enc_fs_locations_sz \
718                                 (compound_encode_hdr_maxsz + \
719                                  encode_sequence_maxsz + \
720                                  encode_putfh_maxsz + \
721                                  encode_lookup_maxsz + \
722                                  encode_fs_locations_maxsz)
723 #define NFS4_dec_fs_locations_sz \
724                                 (compound_decode_hdr_maxsz + \
725                                  decode_sequence_maxsz + \
726                                  decode_putfh_maxsz + \
727                                  decode_lookup_maxsz + \
728                                  decode_fs_locations_maxsz)
729 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
730                                 encode_sequence_maxsz + \
731                                 encode_putfh_maxsz + \
732                                 encode_secinfo_maxsz)
733 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
734                                 decode_sequence_maxsz + \
735                                 decode_putfh_maxsz + \
736                                 decode_secinfo_maxsz)
737 #if defined(CONFIG_NFS_V4_1)
738 #define NFS4_enc_bind_conn_to_session_sz \
739                                 (compound_encode_hdr_maxsz + \
740                                  encode_bind_conn_to_session_maxsz)
741 #define NFS4_dec_bind_conn_to_session_sz \
742                                 (compound_decode_hdr_maxsz + \
743                                  decode_bind_conn_to_session_maxsz)
744 #define NFS4_enc_exchange_id_sz \
745                                 (compound_encode_hdr_maxsz + \
746                                  encode_exchange_id_maxsz)
747 #define NFS4_dec_exchange_id_sz \
748                                 (compound_decode_hdr_maxsz + \
749                                  decode_exchange_id_maxsz)
750 #define NFS4_enc_create_session_sz \
751                                 (compound_encode_hdr_maxsz + \
752                                  encode_create_session_maxsz)
753 #define NFS4_dec_create_session_sz \
754                                 (compound_decode_hdr_maxsz + \
755                                  decode_create_session_maxsz)
756 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
757                                          encode_destroy_session_maxsz)
758 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
759                                          decode_destroy_session_maxsz)
760 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
761                                          encode_destroy_clientid_maxsz)
762 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
763                                          decode_destroy_clientid_maxsz)
764 #define NFS4_enc_sequence_sz \
765                                 (compound_decode_hdr_maxsz + \
766                                  encode_sequence_maxsz)
767 #define NFS4_dec_sequence_sz \
768                                 (compound_decode_hdr_maxsz + \
769                                  decode_sequence_maxsz)
770 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
771                                          encode_sequence_maxsz + \
772                                          encode_putrootfh_maxsz + \
773                                          encode_fsinfo_maxsz)
774 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
775                                          decode_sequence_maxsz + \
776                                          decode_putrootfh_maxsz + \
777                                          decode_fsinfo_maxsz)
778 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
779                                          encode_sequence_maxsz + \
780                                          encode_reclaim_complete_maxsz)
781 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
782                                          decode_sequence_maxsz + \
783                                          decode_reclaim_complete_maxsz)
784 #define NFS4_enc_getdevicelist_sz (compound_encode_hdr_maxsz + \
785                                 encode_sequence_maxsz + \
786                                 encode_putfh_maxsz + \
787                                 encode_getdevicelist_maxsz)
788 #define NFS4_dec_getdevicelist_sz (compound_decode_hdr_maxsz + \
789                                 decode_sequence_maxsz + \
790                                 decode_putfh_maxsz + \
791                                 decode_getdevicelist_maxsz)
792 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
793                                 encode_sequence_maxsz +\
794                                 encode_getdeviceinfo_maxsz)
795 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
796                                 decode_sequence_maxsz + \
797                                 decode_getdeviceinfo_maxsz)
798 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
799                                 encode_sequence_maxsz + \
800                                 encode_putfh_maxsz +        \
801                                 encode_layoutget_maxsz)
802 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
803                                 decode_sequence_maxsz + \
804                                 decode_putfh_maxsz +        \
805                                 decode_layoutget_maxsz)
806 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
807                                 encode_sequence_maxsz +\
808                                 encode_putfh_maxsz + \
809                                 encode_layoutcommit_maxsz + \
810                                 encode_getattr_maxsz)
811 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
812                                 decode_sequence_maxsz + \
813                                 decode_putfh_maxsz + \
814                                 decode_layoutcommit_maxsz + \
815                                 decode_getattr_maxsz)
816 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
817                                 encode_sequence_maxsz + \
818                                 encode_putfh_maxsz + \
819                                 encode_layoutreturn_maxsz)
820 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
821                                 decode_sequence_maxsz + \
822                                 decode_putfh_maxsz + \
823                                 decode_layoutreturn_maxsz)
824 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
825                                         encode_sequence_maxsz + \
826                                         encode_putrootfh_maxsz +\
827                                         encode_secinfo_no_name_maxsz)
828 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
829                                         decode_sequence_maxsz + \
830                                         decode_putrootfh_maxsz + \
831                                         decode_secinfo_no_name_maxsz)
832 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
833                                          encode_sequence_maxsz + \
834                                          encode_test_stateid_maxsz)
835 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
836                                          decode_sequence_maxsz + \
837                                          decode_test_stateid_maxsz)
838 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
839                                          encode_sequence_maxsz + \
840                                          encode_free_stateid_maxsz)
841 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
842                                          decode_sequence_maxsz + \
843                                          decode_free_stateid_maxsz)
844 
845 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
846                                       compound_encode_hdr_maxsz +
847                                       encode_sequence_maxsz +
848                                       encode_putfh_maxsz +
849                                       encode_getattr_maxsz) *
850                                      XDR_UNIT);
851 
852 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
853                                      compound_decode_hdr_maxsz +
854                                      decode_sequence_maxsz +
855                                      decode_putfh_maxsz) *
856                                     XDR_UNIT);
857 #endif /* CONFIG_NFS_V4_1 */
858 
859 static const umode_t nfs_type2fmt[] = {
860         [NF4BAD] = 0,
861         [NF4REG] = S_IFREG,
862         [NF4DIR] = S_IFDIR,
863         [NF4BLK] = S_IFBLK,
864         [NF4CHR] = S_IFCHR,
865         [NF4LNK] = S_IFLNK,
866         [NF4SOCK] = S_IFSOCK,
867         [NF4FIFO] = S_IFIFO,
868         [NF4ATTRDIR] = 0,
869         [NF4NAMEDATTR] = 0,
870 };
871 
872 struct compound_hdr {
873         int32_t         status;
874         uint32_t        nops;
875         __be32 *        nops_p;
876         uint32_t        taglen;
877         char *          tag;
878         uint32_t        replen;         /* expected reply words */
879         u32             minorversion;
880 };
881 
882 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
883 {
884         __be32 *p = xdr_reserve_space(xdr, nbytes);
885         BUG_ON(!p);
886         return p;
887 }
888 
889 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
890 {
891         __be32 *p;
892 
893         p = xdr_reserve_space(xdr, len);
894         xdr_encode_opaque_fixed(p, buf, len);
895 }
896 
897 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
898 {
899         __be32 *p;
900 
901         p = reserve_space(xdr, 4 + len);
902         xdr_encode_opaque(p, str, len);
903 }
904 
905 static void encode_uint32(struct xdr_stream *xdr, u32 n)
906 {
907         __be32 *p;
908 
909         p = reserve_space(xdr, 4);
910         *p = cpu_to_be32(n);
911 }
912 
913 static void encode_uint64(struct xdr_stream *xdr, u64 n)
914 {
915         __be32 *p;
916 
917         p = reserve_space(xdr, 8);
918         xdr_encode_hyper(p, n);
919 }
920 
921 static void encode_nfs4_seqid(struct xdr_stream *xdr,
922                 const struct nfs_seqid *seqid)
923 {
924         encode_uint32(xdr, seqid->sequence->counter);
925 }
926 
927 static void encode_compound_hdr(struct xdr_stream *xdr,
928                                 struct rpc_rqst *req,
929                                 struct compound_hdr *hdr)
930 {
931         __be32 *p;
932         struct rpc_auth *auth = req->rq_cred->cr_auth;
933 
934         /* initialize running count of expected bytes in reply.
935          * NOTE: the replied tag SHOULD be the same is the one sent,
936          * but this is not required as a MUST for the server to do so. */
937         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
938 
939         BUG_ON(hdr->taglen > NFS4_MAXTAGLEN);
940         encode_string(xdr, hdr->taglen, hdr->tag);
941         p = reserve_space(xdr, 8);
942         *p++ = cpu_to_be32(hdr->minorversion);
943         hdr->nops_p = p;
944         *p = cpu_to_be32(hdr->nops);
945 }
946 
947 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
948                 uint32_t replen,
949                 struct compound_hdr *hdr)
950 {
951         encode_uint32(xdr, op);
952         hdr->nops++;
953         hdr->replen += replen;
954 }
955 
956 static void encode_nops(struct compound_hdr *hdr)
957 {
958         BUG_ON(hdr->nops > NFS4_MAX_OPS);
959         *hdr->nops_p = htonl(hdr->nops);
960 }
961 
962 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
963 {
964         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
965 }
966 
967 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
968 {
969         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
970 }
971 
972 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap, const struct nfs_server *server)
973 {
974         char owner_name[IDMAP_NAMESZ];
975         char owner_group[IDMAP_NAMESZ];
976         int owner_namelen = 0;
977         int owner_grouplen = 0;
978         __be32 *p;
979         __be32 *q;
980         int len;
981         uint32_t bmval0 = 0;
982         uint32_t bmval1 = 0;
983 
984         /*
985          * We reserve enough space to write the entire attribute buffer at once.
986          * In the worst-case, this would be
987          *   12(bitmap) + 4(attrlen) + 8(size) + 4(mode) + 4(atime) + 4(mtime)
988          *          = 36 bytes, plus any contribution from variable-length fields
989          *            such as owner/group.
990          */
991         len = 16;
992 
993         /* Sigh */
994         if (iap->ia_valid & ATTR_SIZE)
995                 len += 8;
996         if (iap->ia_valid & ATTR_MODE)
997                 len += 4;
998         if (iap->ia_valid & ATTR_UID) {
999                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1000                 if (owner_namelen < 0) {
1001                         dprintk("nfs: couldn't resolve uid %d to string\n",
1002                                         iap->ia_uid);
1003                         /* XXX */
1004                         strcpy(owner_name, "nobody");
1005                         owner_namelen = sizeof("nobody") - 1;
1006                         /* goto out; */
1007                 }
1008                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1009         }
1010         if (iap->ia_valid & ATTR_GID) {
1011                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1012                 if (owner_grouplen < 0) {
1013                         dprintk("nfs: couldn't resolve gid %d to string\n",
1014                                         iap->ia_gid);
1015                         strcpy(owner_group, "nobody");
1016                         owner_grouplen = sizeof("nobody") - 1;
1017                         /* goto out; */
1018                 }
1019                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1020         }
1021         if (iap->ia_valid & ATTR_ATIME_SET)
1022                 len += 16;
1023         else if (iap->ia_valid & ATTR_ATIME)
1024                 len += 4;
1025         if (iap->ia_valid & ATTR_MTIME_SET)
1026                 len += 16;
1027         else if (iap->ia_valid & ATTR_MTIME)
1028                 len += 4;
1029         p = reserve_space(xdr, len);
1030 
1031         /*
1032          * We write the bitmap length now, but leave the bitmap and the attribute
1033          * buffer length to be backfilled at the end of this routine.
1034          */
1035         *p++ = cpu_to_be32(2);
1036         q = p;
1037         p += 3;
1038 
1039         if (iap->ia_valid & ATTR_SIZE) {
1040                 bmval0 |= FATTR4_WORD0_SIZE;
1041                 p = xdr_encode_hyper(p, iap->ia_size);
1042         }
1043         if (iap->ia_valid & ATTR_MODE) {
1044                 bmval1 |= FATTR4_WORD1_MODE;
1045                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1046         }
1047         if (iap->ia_valid & ATTR_UID) {
1048                 bmval1 |= FATTR4_WORD1_OWNER;
1049                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1050         }
1051         if (iap->ia_valid & ATTR_GID) {
1052                 bmval1 |= FATTR4_WORD1_OWNER_GROUP;
1053                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1054         }
1055         if (iap->ia_valid & ATTR_ATIME_SET) {
1056                 bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
1057                 *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1058                 *p++ = cpu_to_be32(0);
1059                 *p++ = cpu_to_be32(iap->ia_atime.tv_sec);
1060                 *p++ = cpu_to_be32(iap->ia_atime.tv_nsec);
1061         }
1062         else if (iap->ia_valid & ATTR_ATIME) {
1063                 bmval1 |= FATTR4_WORD1_TIME_ACCESS_SET;
1064                 *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1065         }
1066         if (iap->ia_valid & ATTR_MTIME_SET) {
1067                 bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
1068                 *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1069                 *p++ = cpu_to_be32(0);
1070                 *p++ = cpu_to_be32(iap->ia_mtime.tv_sec);
1071                 *p++ = cpu_to_be32(iap->ia_mtime.tv_nsec);
1072         }
1073         else if (iap->ia_valid & ATTR_MTIME) {
1074                 bmval1 |= FATTR4_WORD1_TIME_MODIFY_SET;
1075                 *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1076         }
1077 
1078         /*
1079          * Now we backfill the bitmap and the attribute buffer length.
1080          */
1081         if (len != ((char *)p - (char *)q) + 4) {
1082                 printk(KERN_ERR "NFS: Attr length error, %u != %Zu\n",
1083                                 len, ((char *)p - (char *)q) + 4);
1084                 BUG();
1085         }
1086         len = (char *)p - (char *)q - 12;
1087         *q++ = htonl(bmval0);
1088         *q++ = htonl(bmval1);
1089         *q = htonl(len);
1090 
1091 /* out: */
1092 }
1093 
1094 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1095 {
1096         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1097         encode_uint32(xdr, access);
1098 }
1099 
1100 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1101 {
1102         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1103         encode_nfs4_seqid(xdr, arg->seqid);
1104         encode_nfs4_stateid(xdr, arg->stateid);
1105 }
1106 
1107 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1108 {
1109         __be32 *p;
1110 
1111         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1112         p = reserve_space(xdr, 12);
1113         p = xdr_encode_hyper(p, args->offset);
1114         *p = cpu_to_be32(args->count);
1115 }
1116 
1117 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1118 {
1119         __be32 *p;
1120 
1121         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1122         encode_uint32(xdr, create->ftype);
1123 
1124         switch (create->ftype) {
1125         case NF4LNK:
1126                 p = reserve_space(xdr, 4);
1127                 *p = cpu_to_be32(create->u.symlink.len);
1128                 xdr_write_pages(xdr, create->u.symlink.pages, 0, create->u.symlink.len);
1129                 break;
1130 
1131         case NF4BLK: case NF4CHR:
1132                 p = reserve_space(xdr, 8);
1133                 *p++ = cpu_to_be32(create->u.device.specdata1);
1134                 *p = cpu_to_be32(create->u.device.specdata2);
1135                 break;
1136 
1137         default:
1138                 break;
1139         }
1140 
1141         encode_string(xdr, create->name->len, create->name->name);
1142         encode_attrs(xdr, create->attrs, create->server);
1143 }
1144 
1145 static void encode_getattr_one(struct xdr_stream *xdr, uint32_t bitmap, struct compound_hdr *hdr)
1146 {
1147         __be32 *p;
1148 
1149         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1150         p = reserve_space(xdr, 8);
1151         *p++ = cpu_to_be32(1);
1152         *p = cpu_to_be32(bitmap);
1153 }
1154 
1155 static void encode_getattr_two(struct xdr_stream *xdr, uint32_t bm0, uint32_t bm1, struct compound_hdr *hdr)
1156 {
1157         __be32 *p;
1158 
1159         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1160         p = reserve_space(xdr, 12);
1161         *p++ = cpu_to_be32(2);
1162         *p++ = cpu_to_be32(bm0);
1163         *p = cpu_to_be32(bm1);
1164 }
1165 
1166 static void
1167 encode_getattr_three(struct xdr_stream *xdr,
1168                      uint32_t bm0, uint32_t bm1, uint32_t bm2,
1169                      struct compound_hdr *hdr)
1170 {
1171         __be32 *p;
1172 
1173         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1174         if (bm2) {
1175                 p = reserve_space(xdr, 16);
1176                 *p++ = cpu_to_be32(3);
1177                 *p++ = cpu_to_be32(bm0);
1178                 *p++ = cpu_to_be32(bm1);
1179                 *p = cpu_to_be32(bm2);
1180         } else if (bm1) {
1181                 p = reserve_space(xdr, 12);
1182                 *p++ = cpu_to_be32(2);
1183                 *p++ = cpu_to_be32(bm0);
1184                 *p = cpu_to_be32(bm1);
1185         } else {
1186                 p = reserve_space(xdr, 8);
1187                 *p++ = cpu_to_be32(1);
1188                 *p = cpu_to_be32(bm0);
1189         }
1190 }
1191 
1192 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1193 {
1194         encode_getattr_two(xdr, bitmask[0] & nfs4_fattr_bitmap[0],
1195                            bitmask[1] & nfs4_fattr_bitmap[1], hdr);
1196 }
1197 
1198 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1199                                  const u32 *open_bitmap,
1200                                  struct compound_hdr *hdr)
1201 {
1202         encode_getattr_three(xdr,
1203                              bitmask[0] & open_bitmap[0],
1204                              bitmask[1] & open_bitmap[1],
1205                              bitmask[2] & open_bitmap[2],
1206                              hdr);
1207 }
1208 
1209 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1210 {
1211         encode_getattr_three(xdr,
1212                              bitmask[0] & nfs4_fsinfo_bitmap[0],
1213                              bitmask[1] & nfs4_fsinfo_bitmap[1],
1214                              bitmask[2] & nfs4_fsinfo_bitmap[2],
1215                              hdr);
1216 }
1217 
1218 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1219 {
1220         encode_getattr_two(xdr, bitmask[0] & nfs4_fs_locations_bitmap[0],
1221                            bitmask[1] & nfs4_fs_locations_bitmap[1], hdr);
1222 }
1223 
1224 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1225 {
1226         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1227 }
1228 
1229 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1230 {
1231         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1232         encode_string(xdr, name->len, name->name);
1233 }
1234 
1235 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1236 {
1237         if (fl->fl_type == F_RDLCK)
1238                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1239         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1240 }
1241 
1242 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1243 {
1244         if (fl->fl_end == OFFSET_MAX)
1245                 return ~(uint64_t)0;
1246         return fl->fl_end - fl->fl_start + 1;
1247 }
1248 
1249 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1250 {
1251         __be32 *p;
1252 
1253         p = reserve_space(xdr, 32);
1254         p = xdr_encode_hyper(p, lowner->clientid);
1255         *p++ = cpu_to_be32(20);
1256         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1257         *p++ = cpu_to_be32(lowner->s_dev);
1258         xdr_encode_hyper(p, lowner->id);
1259 }
1260 
1261 /*
1262  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1263  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1264  */
1265 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1266 {
1267         __be32 *p;
1268 
1269         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1270         p = reserve_space(xdr, 28);
1271         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1272         *p++ = cpu_to_be32(args->reclaim);
1273         p = xdr_encode_hyper(p, args->fl->fl_start);
1274         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1275         *p = cpu_to_be32(args->new_lock_owner);
1276         if (args->new_lock_owner){
1277                 encode_nfs4_seqid(xdr, args->open_seqid);
1278                 encode_nfs4_stateid(xdr, args->open_stateid);
1279                 encode_nfs4_seqid(xdr, args->lock_seqid);
1280                 encode_lockowner(xdr, &args->lock_owner);
1281         }
1282         else {
1283                 encode_nfs4_stateid(xdr, args->lock_stateid);
1284                 encode_nfs4_seqid(xdr, args->lock_seqid);
1285         }
1286 }
1287 
1288 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1289 {
1290         __be32 *p;
1291 
1292         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1293         p = reserve_space(xdr, 20);
1294         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1295         p = xdr_encode_hyper(p, args->fl->fl_start);
1296         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1297         encode_lockowner(xdr, &args->lock_owner);
1298 }
1299 
1300 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1301 {
1302         __be32 *p;
1303 
1304         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1305         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1306         encode_nfs4_seqid(xdr, args->seqid);
1307         encode_nfs4_stateid(xdr, args->stateid);
1308         p = reserve_space(xdr, 16);
1309         p = xdr_encode_hyper(p, args->fl->fl_start);
1310         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1311 }
1312 
1313 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1314 {
1315         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1316         encode_lockowner(xdr, lowner);
1317 }
1318 
1319 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1320 {
1321         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1322         encode_string(xdr, name->len, name->name);
1323 }
1324 
1325 static void encode_share_access(struct xdr_stream *xdr, fmode_t fmode)
1326 {
1327         __be32 *p;
1328 
1329         p = reserve_space(xdr, 8);
1330         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1331         case FMODE_READ:
1332                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_READ);
1333                 break;
1334         case FMODE_WRITE:
1335                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_WRITE);
1336                 break;
1337         case FMODE_READ|FMODE_WRITE:
1338                 *p++ = cpu_to_be32(NFS4_SHARE_ACCESS_BOTH);
1339                 break;
1340         default:
1341                 *p++ = cpu_to_be32(0);
1342         }
1343         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1344 }
1345 
1346 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1347 {
1348         __be32 *p;
1349  /*
1350  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1351  * owner 4 = 32
1352  */
1353         encode_nfs4_seqid(xdr, arg->seqid);
1354         encode_share_access(xdr, arg->fmode);
1355         p = reserve_space(xdr, 36);
1356         p = xdr_encode_hyper(p, arg->clientid);
1357         *p++ = cpu_to_be32(24);
1358         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1359         *p++ = cpu_to_be32(arg->server->s_dev);
1360         *p++ = cpu_to_be32(arg->id.uniquifier);
1361         xdr_encode_hyper(p, arg->id.create_time);
1362 }
1363 
1364 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1365 {
1366         __be32 *p;
1367         struct nfs_client *clp;
1368 
1369         p = reserve_space(xdr, 4);
1370         switch(arg->open_flags & O_EXCL) {
1371         case 0:
1372                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1373                 encode_attrs(xdr, arg->u.attrs, arg->server);
1374                 break;
1375         default:
1376                 clp = arg->server->nfs_client;
1377                 if (clp->cl_mvops->minor_version > 0) {
1378                         if (nfs4_has_persistent_session(clp)) {
1379                                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1380                                 encode_attrs(xdr, arg->u.attrs, arg->server);
1381                         } else {
1382                                 struct iattr dummy;
1383 
1384                                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1385                                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1386                                 dummy.ia_valid = 0;
1387                                 encode_attrs(xdr, &dummy, arg->server);
1388                         }
1389                 } else {
1390                         *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1391                         encode_nfs4_verifier(xdr, &arg->u.verifier);
1392                 }
1393         }
1394 }
1395 
1396 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1397 {
1398         __be32 *p;
1399 
1400         p = reserve_space(xdr, 4);
1401         switch (arg->open_flags & O_CREAT) {
1402         case 0:
1403                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1404                 break;
1405         default:
1406                 BUG_ON(arg->claim != NFS4_OPEN_CLAIM_NULL);
1407                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1408                 encode_createmode(xdr, arg);
1409         }
1410 }
1411 
1412 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1413 {
1414         __be32 *p;
1415 
1416         p = reserve_space(xdr, 4);
1417         switch (delegation_type) {
1418         case 0:
1419                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1420                 break;
1421         case FMODE_READ:
1422                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1423                 break;
1424         case FMODE_WRITE|FMODE_READ:
1425                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1426                 break;
1427         default:
1428                 BUG();
1429         }
1430 }
1431 
1432 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1433 {
1434         __be32 *p;
1435 
1436         p = reserve_space(xdr, 4);
1437         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1438         encode_string(xdr, name->len, name->name);
1439 }
1440 
1441 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1442 {
1443         __be32 *p;
1444 
1445         p = reserve_space(xdr, 4);
1446         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1447         encode_delegation_type(xdr, type);
1448 }
1449 
1450 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1451 {
1452         __be32 *p;
1453 
1454         p = reserve_space(xdr, 4);
1455         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1456         encode_nfs4_stateid(xdr, stateid);
1457         encode_string(xdr, name->len, name->name);
1458 }
1459 
1460 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1461 {
1462         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1463         encode_openhdr(xdr, arg);
1464         encode_opentype(xdr, arg);
1465         switch (arg->claim) {
1466         case NFS4_OPEN_CLAIM_NULL:
1467                 encode_claim_null(xdr, arg->name);
1468                 break;
1469         case NFS4_OPEN_CLAIM_PREVIOUS:
1470                 encode_claim_previous(xdr, arg->u.delegation_type);
1471                 break;
1472         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1473                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1474                 break;
1475         default:
1476                 BUG();
1477         }
1478 }
1479 
1480 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1481 {
1482         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1483         encode_nfs4_stateid(xdr, arg->stateid);
1484         encode_nfs4_seqid(xdr, arg->seqid);
1485 }
1486 
1487 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1488 {
1489         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1490         encode_nfs4_stateid(xdr, arg->stateid);
1491         encode_nfs4_seqid(xdr, arg->seqid);
1492         encode_share_access(xdr, arg->fmode);
1493 }
1494 
1495 static void
1496 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1497 {
1498         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1499         encode_string(xdr, fh->size, fh->data);
1500 }
1501 
1502 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1503 {
1504         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1505 }
1506 
1507 static void encode_open_stateid(struct xdr_stream *xdr,
1508                 const struct nfs_open_context *ctx,
1509                 const struct nfs_lock_context *l_ctx,
1510                 fmode_t fmode,
1511                 int zero_seqid)
1512 {
1513         nfs4_stateid stateid;
1514 
1515         if (ctx->state != NULL) {
1516                 const struct nfs_lockowner *lockowner = NULL;
1517 
1518                 if (l_ctx != NULL)
1519                         lockowner = &l_ctx->lockowner;
1520                 nfs4_select_rw_stateid(&stateid, ctx->state,
1521                                 fmode, lockowner);
1522                 if (zero_seqid)
1523                         stateid.seqid = 0;
1524                 encode_nfs4_stateid(xdr, &stateid);
1525         } else
1526                 encode_nfs4_stateid(xdr, &zero_stateid);
1527 }
1528 
1529 static void encode_read(struct xdr_stream *xdr, const struct nfs_readargs *args, struct compound_hdr *hdr)
1530 {
1531         __be32 *p;
1532 
1533         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1534         encode_open_stateid(xdr, args->context, args->lock_context,
1535                         FMODE_READ, hdr->minorversion);
1536 
1537         p = reserve_space(xdr, 12);
1538         p = xdr_encode_hyper(p, args->offset);
1539         *p = cpu_to_be32(args->count);
1540 }
1541 
1542 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1543 {
1544         uint32_t attrs[2] = {
1545                 FATTR4_WORD0_RDATTR_ERROR,
1546                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1547         };
1548         uint32_t dircount = readdir->count >> 1;
1549         __be32 *p, verf[2];
1550 
1551         if (readdir->plus) {
1552                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1553                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1554                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1555                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1556                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1557                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1558                 dircount >>= 1;
1559         }
1560         /* Use mounted_on_fileid only if the server supports it */
1561         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1562                 attrs[0] |= FATTR4_WORD0_FILEID;
1563 
1564         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1565         encode_uint64(xdr, readdir->cookie);
1566         encode_nfs4_verifier(xdr, &readdir->verifier);
1567         p = reserve_space(xdr, 20);
1568         *p++ = cpu_to_be32(dircount);
1569         *p++ = cpu_to_be32(readdir->count);
1570         *p++ = cpu_to_be32(2);
1571 
1572         *p++ = cpu_to_be32(attrs[0] & readdir->bitmask[0]);
1573         *p = cpu_to_be32(attrs[1] & readdir->bitmask[1]);
1574         memcpy(verf, readdir->verifier.data, sizeof(verf));
1575         dprintk("%s: cookie = %Lu, verifier = %08x:%08x, bitmap = %08x:%08x\n",
1576                         __func__,
1577                         (unsigned long long)readdir->cookie,
1578                         verf[0], verf[1],
1579                         attrs[0] & readdir->bitmask[0],
1580                         attrs[1] & readdir->bitmask[1]);
1581 }
1582 
1583 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1584 {
1585         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1586 }
1587 
1588 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1589 {
1590         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1591         encode_string(xdr, name->len, name->name);
1592 }
1593 
1594 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1595 {
1596         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1597         encode_string(xdr, oldname->len, oldname->name);
1598         encode_string(xdr, newname->len, newname->name);
1599 }
1600 
1601 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1602                          struct compound_hdr *hdr)
1603 {
1604         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1605         encode_uint64(xdr, clid);
1606 }
1607 
1608 static void
1609 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1610 {
1611         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1612 }
1613 
1614 static void
1615 encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
1616 {
1617         __be32 *p;
1618 
1619         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1620         encode_nfs4_stateid(xdr, &zero_stateid);
1621         p = reserve_space(xdr, 2*4);
1622         *p++ = cpu_to_be32(1);
1623         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1624         BUG_ON(arg->acl_len % 4);
1625         p = reserve_space(xdr, 4);
1626         *p = cpu_to_be32(arg->acl_len);
1627         xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
1628 }
1629 
1630 static void
1631 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1632 {
1633         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1634 }
1635 
1636 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1637 {
1638         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1639         encode_nfs4_stateid(xdr, &arg->stateid);
1640         encode_attrs(xdr, arg->iap, server);
1641 }
1642 
1643 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1644 {
1645         __be32 *p;
1646 
1647         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1648         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1649 
1650         encode_string(xdr, setclientid->sc_name_len, setclientid->sc_name);
1651         p = reserve_space(xdr, 4);
1652         *p = cpu_to_be32(setclientid->sc_prog);
1653         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1654         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1655         p = reserve_space(xdr, 4);
1656         *p = cpu_to_be32(setclientid->sc_cb_ident);
1657 }
1658 
1659 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1660 {
1661         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1662                         decode_setclientid_confirm_maxsz, hdr);
1663         encode_uint64(xdr, arg->clientid);
1664         encode_nfs4_verifier(xdr, &arg->confirm);
1665 }
1666 
1667 static void encode_write(struct xdr_stream *xdr, const struct nfs_writeargs *args, struct compound_hdr *hdr)
1668 {
1669         __be32 *p;
1670 
1671         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1672         encode_open_stateid(xdr, args->context, args->lock_context,
1673                         FMODE_WRITE, hdr->minorversion);
1674 
1675         p = reserve_space(xdr, 16);
1676         p = xdr_encode_hyper(p, args->offset);
1677         *p++ = cpu_to_be32(args->stable);
1678         *p = cpu_to_be32(args->count);
1679 
1680         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1681 }
1682 
1683 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1684 {
1685         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1686         encode_nfs4_stateid(xdr, stateid);
1687 }
1688 
1689 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1690 {
1691         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1692         encode_string(xdr, name->len, name->name);
1693 }
1694 
1695 #if defined(CONFIG_NFS_V4_1)
1696 /* NFSv4.1 operations */
1697 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1698                                    struct nfs4_session *session,
1699                                    struct compound_hdr *hdr)
1700 {
1701         __be32 *p;
1702 
1703         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1704                 decode_bind_conn_to_session_maxsz, hdr);
1705         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1706         p = xdr_reserve_space(xdr, 8);
1707         *p++ = cpu_to_be32(NFS4_CDFC4_BACK_OR_BOTH);
1708         *p = 0; /* use_conn_in_rdma_mode = False */
1709 }
1710 
1711 static void encode_exchange_id(struct xdr_stream *xdr,
1712                                struct nfs41_exchange_id_args *args,
1713                                struct compound_hdr *hdr)
1714 {
1715         __be32 *p;
1716         char impl_name[NFS4_OPAQUE_LIMIT];
1717         int len = 0;
1718 
1719         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1720         encode_nfs4_verifier(xdr, args->verifier);
1721 
1722         encode_string(xdr, args->id_len, args->id);
1723 
1724         p = reserve_space(xdr, 12);
1725         *p++ = cpu_to_be32(args->flags);
1726         *p++ = cpu_to_be32(0);  /* zero length state_protect4_a */
1727 
1728         if (send_implementation_id &&
1729             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1730             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1731                 <= NFS4_OPAQUE_LIMIT + 1)
1732                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1733                                utsname()->sysname, utsname()->release,
1734                                utsname()->version, utsname()->machine);
1735 
1736         if (len > 0) {
1737                 *p = cpu_to_be32(1);    /* implementation id array length=1 */
1738 
1739                 encode_string(xdr,
1740                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1741                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1742                 encode_string(xdr, len, impl_name);
1743                 /* just send zeros for nii_date - the date is in nii_name */
1744                 p = reserve_space(xdr, 12);
1745                 p = xdr_encode_hyper(p, 0);
1746                 *p = cpu_to_be32(0);
1747         } else
1748                 *p = cpu_to_be32(0);    /* implementation id array length=0 */
1749 }
1750 
1751 static void encode_create_session(struct xdr_stream *xdr,
1752                                   struct nfs41_create_session_args *args,
1753                                   struct compound_hdr *hdr)
1754 {
1755         __be32 *p;
1756         char machine_name[NFS4_MAX_MACHINE_NAME_LEN];
1757         uint32_t len;
1758         struct nfs_client *clp = args->client;
1759         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1760         u32 max_resp_sz_cached;
1761 
1762         /*
1763          * Assumes OPEN is the biggest non-idempotent compound.
1764          * 2 is the verifier.
1765          */
1766         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
1767                               RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
1768 
1769         len = scnprintf(machine_name, sizeof(machine_name), "%s",
1770                         clp->cl_ipaddr);
1771 
1772         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1773         p = reserve_space(xdr, 16 + 2*28 + 20 + len + 12);
1774         p = xdr_encode_hyper(p, clp->cl_clientid);
1775         *p++ = cpu_to_be32(clp->cl_seqid);                      /*Sequence id */
1776         *p++ = cpu_to_be32(args->flags);                        /*flags */
1777 
1778         /* Fore Channel */
1779         *p++ = cpu_to_be32(0);                          /* header padding size */
1780         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1781         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1782         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1783         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1784         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1785         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1786 
1787         /* Back Channel */
1788         *p++ = cpu_to_be32(0);                          /* header padding size */
1789         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1790         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1791         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1792         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1793         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1794         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1795 
1796         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1797         *p++ = cpu_to_be32(1);
1798         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1799 
1800         /* authsys_parms rfc1831 */
1801         *p++ = (__be32)nn->boot_time.tv_nsec;           /* stamp */
1802         p = xdr_encode_opaque(p, machine_name, len);
1803         *p++ = cpu_to_be32(0);                          /* UID */
1804         *p++ = cpu_to_be32(0);                          /* GID */
1805         *p = cpu_to_be32(0);                            /* No more gids */
1806 }
1807 
1808 static void encode_destroy_session(struct xdr_stream *xdr,
1809                                    struct nfs4_session *session,
1810                                    struct compound_hdr *hdr)
1811 {
1812         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1813         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1814 }
1815 
1816 static void encode_destroy_clientid(struct xdr_stream *xdr,
1817                                    uint64_t clientid,
1818                                    struct compound_hdr *hdr)
1819 {
1820         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1821         encode_uint64(xdr, clientid);
1822 }
1823 
1824 static void encode_reclaim_complete(struct xdr_stream *xdr,
1825                                     struct nfs41_reclaim_complete_args *args,
1826                                     struct compound_hdr *hdr)
1827 {
1828         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1829         encode_uint32(xdr, args->one_fs);
1830 }
1831 #endif /* CONFIG_NFS_V4_1 */
1832 
1833 static void encode_sequence(struct xdr_stream *xdr,
1834                             const struct nfs4_sequence_args *args,
1835                             struct compound_hdr *hdr)
1836 {
1837 #if defined(CONFIG_NFS_V4_1)
1838         struct nfs4_session *session = args->sa_session;
1839         struct nfs4_slot_table *tp;
1840         struct nfs4_slot *slot;
1841         __be32 *p;
1842 
1843         if (!session)
1844                 return;
1845 
1846         tp = &session->fc_slot_table;
1847 
1848         WARN_ON(args->sa_slotid == NFS4_MAX_SLOT_TABLE);
1849         slot = tp->slots + args->sa_slotid;
1850 
1851         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1852 
1853         /*
1854          * Sessionid + seqid + slotid + max slotid + cache_this
1855          */
1856         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1857                 "max_slotid=%d cache_this=%d\n",
1858                 __func__,
1859                 ((u32 *)session->sess_id.data)[0],
1860                 ((u32 *)session->sess_id.data)[1],
1861                 ((u32 *)session->sess_id.data)[2],
1862                 ((u32 *)session->sess_id.data)[3],
1863                 slot->seq_nr, args->sa_slotid,
1864                 tp->highest_used_slotid, args->sa_cache_this);
1865         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1866         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1867         *p++ = cpu_to_be32(slot->seq_nr);
1868         *p++ = cpu_to_be32(args->sa_slotid);
1869         *p++ = cpu_to_be32(tp->highest_used_slotid);
1870         *p = cpu_to_be32(args->sa_cache_this);
1871 #endif /* CONFIG_NFS_V4_1 */
1872 }
1873 
1874 #ifdef CONFIG_NFS_V4_1
1875 static void
1876 encode_getdevicelist(struct xdr_stream *xdr,
1877                      const struct nfs4_getdevicelist_args *args,
1878                      struct compound_hdr *hdr)
1879 {
1880         __be32 *p;
1881         nfs4_verifier dummy = {
1882                 .data = "dummmmmy",
1883         };
1884 
1885         encode_op_hdr(xdr, OP_GETDEVICELIST, decode_getdevicelist_maxsz, hdr);
1886         p = reserve_space(xdr, 16);
1887         *p++ = cpu_to_be32(args->layoutclass);
1888         *p++ = cpu_to_be32(NFS4_PNFS_GETDEVLIST_MAXNUM);
1889         xdr_encode_hyper(p, 0ULL);                          /* cookie */
1890         encode_nfs4_verifier(xdr, &dummy);
1891 }
1892 
1893 static void
1894 encode_getdeviceinfo(struct xdr_stream *xdr,
1895                      const struct nfs4_getdeviceinfo_args *args,
1896                      struct compound_hdr *hdr)
1897 {
1898         __be32 *p;
1899 
1900         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1901         p = reserve_space(xdr, 12 + NFS4_DEVICEID4_SIZE);
1902         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1903                                     NFS4_DEVICEID4_SIZE);
1904         *p++ = cpu_to_be32(args->pdev->layout_type);
1905         *p++ = cpu_to_be32(args->pdev->pglen);          /* gdia_maxcount */
1906         *p++ = cpu_to_be32(0);                          /* bitmap length 0 */
1907 }
1908 
1909 static void
1910 encode_layoutget(struct xdr_stream *xdr,
1911                       const struct nfs4_layoutget_args *args,
1912                       struct compound_hdr *hdr)
1913 {
1914         __be32 *p;
1915 
1916         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1917         p = reserve_space(xdr, 36);
1918         *p++ = cpu_to_be32(0);     /* Signal layout available */
1919         *p++ = cpu_to_be32(args->type);
1920         *p++ = cpu_to_be32(args->range.iomode);
1921         p = xdr_encode_hyper(p, args->range.offset);
1922         p = xdr_encode_hyper(p, args->range.length);
1923         p = xdr_encode_hyper(p, args->minlength);
1924         encode_nfs4_stateid(xdr, &args->stateid);
1925         encode_uint32(xdr, args->maxcount);
1926 
1927         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1928                 __func__,
1929                 args->type,
1930                 args->range.iomode,
1931                 (unsigned long)args->range.offset,
1932                 (unsigned long)args->range.length,
1933                 args->maxcount);
1934 }
1935 
1936 static int
1937 encode_layoutcommit(struct xdr_stream *xdr,
1938                     struct inode *inode,
1939                     const struct nfs4_layoutcommit_args *args,
1940                     struct compound_hdr *hdr)
1941 {
1942         __be32 *p;
1943 
1944         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
1945                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
1946 
1947         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
1948         p = reserve_space(xdr, 20);
1949         /* Only whole file layouts */
1950         p = xdr_encode_hyper(p, 0); /* offset */
1951         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
1952         *p = cpu_to_be32(0); /* reclaim */
1953         encode_nfs4_stateid(xdr, &args->stateid);
1954         p = reserve_space(xdr, 20);
1955         *p++ = cpu_to_be32(1); /* newoffset = TRUE */
1956         p = xdr_encode_hyper(p, args->lastbytewritten);
1957         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
1958         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
1959 
1960         if (NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit)
1961                 NFS_SERVER(inode)->pnfs_curr_ld->encode_layoutcommit(
1962                         NFS_I(inode)->layout, xdr, args);
1963         else
1964                 encode_uint32(xdr, 0); /* no layout-type payload */
1965 
1966         return 0;
1967 }
1968 
1969 static void
1970 encode_layoutreturn(struct xdr_stream *xdr,
1971                     const struct nfs4_layoutreturn_args *args,
1972                     struct compound_hdr *hdr)
1973 {
1974         __be32 *p;
1975 
1976         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
1977         p = reserve_space(xdr, 16);
1978         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
1979         *p++ = cpu_to_be32(args->layout_type);
1980         *p++ = cpu_to_be32(IOMODE_ANY);
1981         *p = cpu_to_be32(RETURN_FILE);
1982         p = reserve_space(xdr, 16);
1983         p = xdr_encode_hyper(p, 0);
1984         p = xdr_encode_hyper(p, NFS4_MAX_UINT64);
1985         spin_lock(&args->inode->i_lock);
1986         encode_nfs4_stateid(xdr, &args->stateid);
1987         spin_unlock(&args->inode->i_lock);
1988         if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
1989                 NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
1990                         NFS_I(args->inode)->layout, xdr, args);
1991         } else
1992                 encode_uint32(xdr, 0);
1993 }
1994 
1995 static int
1996 encode_secinfo_no_name(struct xdr_stream *xdr,
1997                        const struct nfs41_secinfo_no_name_args *args,
1998                        struct compound_hdr *hdr)
1999 {
2000         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2001         encode_uint32(xdr, args->style);
2002         return 0;
2003 }
2004 
2005 static void encode_test_stateid(struct xdr_stream *xdr,
2006                                 struct nfs41_test_stateid_args *args,
2007                                 struct compound_hdr *hdr)
2008 {
2009         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2010         encode_uint32(xdr, 1);
2011         encode_nfs4_stateid(xdr, args->stateid);
2012 }
2013 
2014 static void encode_free_stateid(struct xdr_stream *xdr,
2015                                 struct nfs41_free_stateid_args *args,
2016                                 struct compound_hdr *hdr)
2017 {
2018         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2019         encode_nfs4_stateid(xdr, args->stateid);
2020 }
2021 #endif /* CONFIG_NFS_V4_1 */
2022 
2023 /*
2024  * END OF "GENERIC" ENCODE ROUTINES.
2025  */
2026 
2027 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2028 {
2029 #if defined(CONFIG_NFS_V4_1)
2030         if (args->sa_session)
2031                 return args->sa_session->clp->cl_mvops->minor_version;
2032 #endif /* CONFIG_NFS_V4_1 */
2033         return 0;
2034 }
2035 
2036 /*
2037  * Encode an ACCESS request
2038  */
2039 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2040                                 const struct nfs4_accessargs *args)
2041 {
2042         struct compound_hdr hdr = {
2043                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2044         };
2045 
2046         encode_compound_hdr(xdr, req, &hdr);
2047         encode_sequence(xdr, &args->seq_args, &hdr);
2048         encode_putfh(xdr, args->fh, &hdr);
2049         encode_access(xdr, args->access, &hdr);
2050         encode_getfattr(xdr, args->bitmask, &hdr);
2051         encode_nops(&hdr);
2052 }
2053 
2054 /*
2055  * Encode LOOKUP request
2056  */
2057 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2058                                 const struct nfs4_lookup_arg *args)
2059 {
2060         struct compound_hdr hdr = {
2061                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2062         };
2063 
2064         encode_compound_hdr(xdr, req, &hdr);
2065         encode_sequence(xdr, &args->seq_args, &hdr);
2066         encode_putfh(xdr, args->dir_fh, &hdr);
2067         encode_lookup(xdr, args->name, &hdr);
2068         encode_getfh(xdr, &hdr);
2069         encode_getfattr(xdr, args->bitmask, &hdr);
2070         encode_nops(&hdr);
2071 }
2072 
2073 /*
2074  * Encode LOOKUP_ROOT request
2075  */
2076 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2077                                      struct xdr_stream *xdr,
2078                                      const struct nfs4_lookup_root_arg *args)
2079 {
2080         struct compound_hdr hdr = {
2081                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2082         };
2083 
2084         encode_compound_hdr(xdr, req, &hdr);
2085         encode_sequence(xdr, &args->seq_args, &hdr);
2086         encode_putrootfh(xdr, &hdr);
2087         encode_getfh(xdr, &hdr);
2088         encode_getfattr(xdr, args->bitmask, &hdr);
2089         encode_nops(&hdr);
2090 }
2091 
2092 /*
2093  * Encode REMOVE request
2094  */
2095 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2096                                 const struct nfs_removeargs *args)
2097 {
2098         struct compound_hdr hdr = {
2099                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2100         };
2101 
2102         encode_compound_hdr(xdr, req, &hdr);
2103         encode_sequence(xdr, &args->seq_args, &hdr);
2104         encode_putfh(xdr, args->fh, &hdr);
2105         encode_remove(xdr, &args->name, &hdr);
2106         encode_nops(&hdr);
2107 }
2108 
2109 /*
2110  * Encode RENAME request
2111  */
2112 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2113                                 const struct nfs_renameargs *args)
2114 {
2115         struct compound_hdr hdr = {
2116                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2117         };
2118 
2119         encode_compound_hdr(xdr, req, &hdr);
2120         encode_sequence(xdr, &args->seq_args, &hdr);
2121         encode_putfh(xdr, args->old_dir, &hdr);
2122         encode_savefh(xdr, &hdr);
2123         encode_putfh(xdr, args->new_dir, &hdr);
2124         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2125         encode_nops(&hdr);
2126 }
2127 
2128 /*
2129  * Encode LINK request
2130  */
2131 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2132                              const struct nfs4_link_arg *args)
2133 {
2134         struct compound_hdr hdr = {
2135                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2136         };
2137 
2138         encode_compound_hdr(xdr, req, &hdr);
2139         encode_sequence(xdr, &args->seq_args, &hdr);
2140         encode_putfh(xdr, args->fh, &hdr);
2141         encode_savefh(xdr, &hdr);
2142         encode_putfh(xdr, args->dir_fh, &hdr);
2143         encode_link(xdr, args->name, &hdr);
2144         encode_restorefh(xdr, &hdr);
2145         encode_getfattr(xdr, args->bitmask, &hdr);
2146         encode_nops(&hdr);
2147 }
2148 
2149 /*
2150  * Encode CREATE request
2151  */
2152 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2153                                 const struct nfs4_create_arg *args)
2154 {
2155         struct compound_hdr hdr = {
2156                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2157         };
2158 
2159         encode_compound_hdr(xdr, req, &hdr);
2160         encode_sequence(xdr, &args->seq_args, &hdr);
2161         encode_putfh(xdr, args->dir_fh, &hdr);
2162         encode_create(xdr, args, &hdr);
2163         encode_getfh(xdr, &hdr);
2164         encode_getfattr(xdr, args->bitmask, &hdr);
2165         encode_nops(&hdr);
2166 }
2167 
2168 /*
2169  * Encode SYMLINK request
2170  */
2171 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2172                                  const struct nfs4_create_arg *args)
2173 {
2174         nfs4_xdr_enc_create(req, xdr, args);
2175 }
2176 
2177 /*
2178  * Encode GETATTR request
2179  */
2180 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2181                                  const struct nfs4_getattr_arg *args)
2182 {
2183         struct compound_hdr hdr = {
2184                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2185         };
2186 
2187         encode_compound_hdr(xdr, req, &hdr);
2188         encode_sequence(xdr, &args->seq_args, &hdr);
2189         encode_putfh(xdr, args->fh, &hdr);
2190         encode_getfattr(xdr, args->bitmask, &hdr);
2191         encode_nops(&hdr);
2192 }
2193 
2194 /*
2195  * Encode a CLOSE request
2196  */
2197 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2198                                struct nfs_closeargs *args)
2199 {
2200         struct compound_hdr hdr = {
2201                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2202         };
2203 
2204         encode_compound_hdr(xdr, req, &hdr);
2205         encode_sequence(xdr, &args->seq_args, &hdr);
2206         encode_putfh(xdr, args->fh, &hdr);
2207         encode_close(xdr, args, &hdr);
2208         encode_getfattr(xdr, args->bitmask, &hdr);
2209         encode_nops(&hdr);
2210 }
2211 
2212 /*
2213  * Encode an OPEN request
2214  */
2215 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2216                               struct nfs_openargs *args)
2217 {
2218         struct compound_hdr hdr = {
2219                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2220         };
2221 
2222         encode_compound_hdr(xdr, req, &hdr);
2223         encode_sequence(xdr, &args->seq_args, &hdr);
2224         encode_putfh(xdr, args->fh, &hdr);
2225         encode_open(xdr, args, &hdr);
2226         encode_getfh(xdr, &hdr);
2227         if (args->access)
2228                 encode_access(xdr, args->access, &hdr);
2229         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2230         encode_nops(&hdr);
2231 }
2232 
2233 /*
2234  * Encode an OPEN_CONFIRM request
2235  */
2236 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2237                                       struct xdr_stream *xdr,
2238                                       struct nfs_open_confirmargs *args)
2239 {
2240         struct compound_hdr hdr = {
2241                 .nops   = 0,
2242         };
2243 
2244         encode_compound_hdr(xdr, req, &hdr);
2245         encode_putfh(xdr, args->fh, &hdr);
2246         encode_open_confirm(xdr, args, &hdr);
2247         encode_nops(&hdr);
2248 }
2249 
2250 /*
2251  * Encode an OPEN request with no attributes.
2252  */
2253 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2254                                      struct xdr_stream *xdr,
2255                                      struct nfs_openargs *args)
2256 {
2257         struct compound_hdr hdr = {
2258                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2259         };
2260 
2261         encode_compound_hdr(xdr, req, &hdr);
2262         encode_sequence(xdr, &args->seq_args, &hdr);
2263         encode_putfh(xdr, args->fh, &hdr);
2264         encode_open(xdr, args, &hdr);
2265         if (args->access)
2266                 encode_access(xdr, args->access, &hdr);
2267         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2268         encode_nops(&hdr);
2269 }
2270 
2271 /*
2272  * Encode an OPEN_DOWNGRADE request
2273  */
2274 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2275                                         struct xdr_stream *xdr,
2276                                         struct nfs_closeargs *args)
2277 {
2278         struct compound_hdr hdr = {
2279                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2280         };
2281 
2282         encode_compound_hdr(xdr, req, &hdr);
2283         encode_sequence(xdr, &args->seq_args, &hdr);
2284         encode_putfh(xdr, args->fh, &hdr);
2285         encode_open_downgrade(xdr, args, &hdr);
2286         encode_getfattr(xdr, args->bitmask, &hdr);
2287         encode_nops(&hdr);
2288 }
2289 
2290 /*
2291  * Encode a LOCK request
2292  */
2293 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2294                               struct nfs_lock_args *args)
2295 {
2296         struct compound_hdr hdr = {
2297                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2298         };
2299 
2300         encode_compound_hdr(xdr, req, &hdr);
2301         encode_sequence(xdr, &args->seq_args, &hdr);
2302         encode_putfh(xdr, args->fh, &hdr);
2303         encode_lock(xdr, args, &hdr);
2304         encode_nops(&hdr);
2305 }
2306 
2307 /*
2308  * Encode a LOCKT request
2309  */
2310 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2311                                struct nfs_lockt_args *args)
2312 {
2313         struct compound_hdr hdr = {
2314                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2315         };
2316 
2317         encode_compound_hdr(xdr, req, &hdr);
2318         encode_sequence(xdr, &args->seq_args, &hdr);
2319         encode_putfh(xdr, args->fh, &hdr);
2320         encode_lockt(xdr, args, &hdr);
2321         encode_nops(&hdr);
2322 }
2323 
2324 /*
2325  * Encode a LOCKU request
2326  */
2327 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2328                                struct nfs_locku_args *args)
2329 {
2330         struct compound_hdr hdr = {
2331                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2332         };
2333 
2334         encode_compound_hdr(xdr, req, &hdr);
2335         encode_sequence(xdr, &args->seq_args, &hdr);
2336         encode_putfh(xdr, args->fh, &hdr);
2337         encode_locku(xdr, args, &hdr);
2338         encode_nops(&hdr);
2339 }
2340 
2341 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2342                                            struct xdr_stream *xdr,
2343                                         struct nfs_release_lockowner_args *args)
2344 {
2345         struct compound_hdr hdr = {
2346                 .minorversion = 0,
2347         };
2348 
2349         encode_compound_hdr(xdr, req, &hdr);
2350         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2351         encode_nops(&hdr);
2352 }
2353 
2354 /*
2355  * Encode a READLINK request
2356  */
2357 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2358                                   const struct nfs4_readlink *args)
2359 {
2360         struct compound_hdr hdr = {
2361                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2362         };
2363 
2364         encode_compound_hdr(xdr, req, &hdr);
2365         encode_sequence(xdr, &args->seq_args, &hdr);
2366         encode_putfh(xdr, args->fh, &hdr);
2367         encode_readlink(xdr, args, req, &hdr);
2368 
2369         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2370                         args->pgbase, args->pglen);
2371         encode_nops(&hdr);
2372 }
2373 
2374 /*
2375  * Encode a READDIR request
2376  */
2377 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2378                                  const struct nfs4_readdir_arg *args)
2379 {
2380         struct compound_hdr hdr = {
2381                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2382         };
2383 
2384         encode_compound_hdr(xdr, req, &hdr);
2385         encode_sequence(xdr, &args->seq_args, &hdr);
2386         encode_putfh(xdr, args->fh, &hdr);
2387         encode_readdir(xdr, args, req, &hdr);
2388 
2389         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2390                          args->pgbase, args->count);
2391         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2392                         __func__, hdr.replen << 2, args->pages,
2393                         args->pgbase, args->count);
2394         encode_nops(&hdr);
2395 }
2396 
2397 /*
2398  * Encode a READ request
2399  */
2400 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2401                               struct nfs_readargs *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_read(xdr, args, &hdr);
2411 
2412         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2413                          args->pages, args->pgbase, args->count);
2414         req->rq_rcv_buf.flags |= XDRBUF_READ;
2415         encode_nops(&hdr);
2416 }
2417 
2418 /*
2419  * Encode an SETATTR request
2420  */
2421 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2422                                  struct nfs_setattrargs *args)
2423 {
2424         struct compound_hdr hdr = {
2425                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2426         };
2427 
2428         encode_compound_hdr(xdr, req, &hdr);
2429         encode_sequence(xdr, &args->seq_args, &hdr);
2430         encode_putfh(xdr, args->fh, &hdr);
2431         encode_setattr(xdr, args, args->server, &hdr);
2432         encode_getfattr(xdr, args->bitmask, &hdr);
2433         encode_nops(&hdr);
2434 }
2435 
2436 /*
2437  * Encode a GETACL request
2438  */
2439 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2440                                 struct nfs_getaclargs *args)
2441 {
2442         struct compound_hdr hdr = {
2443                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2444         };
2445         uint32_t replen;
2446 
2447         encode_compound_hdr(xdr, req, &hdr);
2448         encode_sequence(xdr, &args->seq_args, &hdr);
2449         encode_putfh(xdr, args->fh, &hdr);
2450         replen = hdr.replen + op_decode_hdr_maxsz + 1;
2451         encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
2452 
2453         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2454                 args->acl_pages, args->acl_pgbase, args->acl_len);
2455 
2456         encode_nops(&hdr);
2457 }
2458 
2459 /*
2460  * Encode a WRITE request
2461  */
2462 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2463                                struct nfs_writeargs *args)
2464 {
2465         struct compound_hdr hdr = {
2466                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2467         };
2468 
2469         encode_compound_hdr(xdr, req, &hdr);
2470         encode_sequence(xdr, &args->seq_args, &hdr);
2471         encode_putfh(xdr, args->fh, &hdr);
2472         encode_write(xdr, args, &hdr);
2473         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2474         if (args->bitmask)
2475                 encode_getfattr(xdr, args->bitmask, &hdr);
2476         encode_nops(&hdr);
2477 }
2478 
2479 /*
2480  *  a COMMIT request
2481  */
2482 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2483                                 struct nfs_commitargs *args)
2484 {
2485         struct compound_hdr hdr = {
2486                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2487         };
2488 
2489         encode_compound_hdr(xdr, req, &hdr);
2490         encode_sequence(xdr, &args->seq_args, &hdr);
2491         encode_putfh(xdr, args->fh, &hdr);
2492         encode_commit(xdr, args, &hdr);
2493         encode_nops(&hdr);
2494 }
2495 
2496 /*
2497  * FSINFO request
2498  */
2499 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2500                                 struct nfs4_fsinfo_arg *args)
2501 {
2502         struct compound_hdr hdr = {
2503                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2504         };
2505 
2506         encode_compound_hdr(xdr, req, &hdr);
2507         encode_sequence(xdr, &args->seq_args, &hdr);
2508         encode_putfh(xdr, args->fh, &hdr);
2509         encode_fsinfo(xdr, args->bitmask, &hdr);
2510         encode_nops(&hdr);
2511 }
2512 
2513 /*
2514  * a PATHCONF request
2515  */
2516 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2517                                   const struct nfs4_pathconf_arg *args)
2518 {
2519         struct compound_hdr hdr = {
2520                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2521         };
2522 
2523         encode_compound_hdr(xdr, req, &hdr);
2524         encode_sequence(xdr, &args->seq_args, &hdr);
2525         encode_putfh(xdr, args->fh, &hdr);
2526         encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
2527                            &hdr);
2528         encode_nops(&hdr);
2529 }
2530 
2531 /*
2532  * a STATFS request
2533  */
2534 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2535                                 const struct nfs4_statfs_arg *args)
2536 {
2537         struct compound_hdr hdr = {
2538                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2539         };
2540 
2541         encode_compound_hdr(xdr, req, &hdr);
2542         encode_sequence(xdr, &args->seq_args, &hdr);
2543         encode_putfh(xdr, args->fh, &hdr);
2544         encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
2545                            args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
2546         encode_nops(&hdr);
2547 }
2548 
2549 /*
2550  * GETATTR_BITMAP request
2551  */
2552 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2553                                      struct xdr_stream *xdr,
2554                                      struct nfs4_server_caps_arg *args)
2555 {
2556         struct compound_hdr hdr = {
2557                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2558         };
2559 
2560         encode_compound_hdr(xdr, req, &hdr);
2561         encode_sequence(xdr, &args->seq_args, &hdr);
2562         encode_putfh(xdr, args->fhandle, &hdr);
2563         encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
2564                            FATTR4_WORD0_FH_EXPIRE_TYPE|
2565                            FATTR4_WORD0_LINK_SUPPORT|
2566                            FATTR4_WORD0_SYMLINK_SUPPORT|
2567                            FATTR4_WORD0_ACLSUPPORT, &hdr);
2568         encode_nops(&hdr);
2569 }
2570 
2571 /*
2572  * a RENEW request
2573  */
2574 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2575                                struct nfs_client *clp)
2576 {
2577         struct compound_hdr hdr = {
2578                 .nops   = 0,
2579         };
2580 
2581         encode_compound_hdr(xdr, req, &hdr);
2582         encode_renew(xdr, clp->cl_clientid, &hdr);
2583         encode_nops(&hdr);
2584 }
2585 
2586 /*
2587  * a SETCLIENTID request
2588  */
2589 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2590                                      struct xdr_stream *xdr,
2591                                      struct nfs4_setclientid *sc)
2592 {
2593         struct compound_hdr hdr = {
2594                 .nops   = 0,
2595         };
2596 
2597         encode_compound_hdr(xdr, req, &hdr);
2598         encode_setclientid(xdr, sc, &hdr);
2599         encode_nops(&hdr);
2600 }
2601 
2602 /*
2603  * a SETCLIENTID_CONFIRM request
2604  */
2605 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2606                                              struct xdr_stream *xdr,
2607                                              struct nfs4_setclientid_res *arg)
2608 {
2609         struct compound_hdr hdr = {
2610                 .nops   = 0,
2611         };
2612         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2613 
2614         encode_compound_hdr(xdr, req, &hdr);
2615         encode_setclientid_confirm(xdr, arg, &hdr);
2616         encode_putrootfh(xdr, &hdr);
2617         encode_fsinfo(xdr, lease_bitmap, &hdr);
2618         encode_nops(&hdr);
2619 }
2620 
2621 /*
2622  * DELEGRETURN request
2623  */
2624 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2625                                      struct xdr_stream *xdr,
2626                                      const struct nfs4_delegreturnargs *args)
2627 {
2628         struct compound_hdr hdr = {
2629                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2630         };
2631 
2632         encode_compound_hdr(xdr, req, &hdr);
2633         encode_sequence(xdr, &args->seq_args, &hdr);
2634         encode_putfh(xdr, args->fhandle, &hdr);
2635         encode_getfattr(xdr, args->bitmask, &hdr);
2636         encode_delegreturn(xdr, args->stateid, &hdr);
2637         encode_nops(&hdr);
2638 }
2639 
2640 /*
2641  * Encode FS_LOCATIONS request
2642  */
2643 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2644                                       struct xdr_stream *xdr,
2645                                       struct nfs4_fs_locations_arg *args)
2646 {
2647         struct compound_hdr hdr = {
2648                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2649         };
2650         uint32_t replen;
2651 
2652         encode_compound_hdr(xdr, req, &hdr);
2653         encode_sequence(xdr, &args->seq_args, &hdr);
2654         encode_putfh(xdr, args->dir_fh, &hdr);
2655         encode_lookup(xdr, args->name, &hdr);
2656         replen = hdr.replen;    /* get the attribute into args->page */
2657         encode_fs_locations(xdr, args->bitmask, &hdr);
2658 
2659         xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
2660                         0, PAGE_SIZE);
2661         encode_nops(&hdr);
2662 }
2663 
2664 /*
2665  * Encode SECINFO request
2666  */
2667 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2668                                 struct xdr_stream *xdr,
2669                                 struct nfs4_secinfo_arg *args)
2670 {
2671         struct compound_hdr hdr = {
2672                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2673         };
2674 
2675         encode_compound_hdr(xdr, req, &hdr);
2676         encode_sequence(xdr, &args->seq_args, &hdr);
2677         encode_putfh(xdr, args->dir_fh, &hdr);
2678         encode_secinfo(xdr, args->name, &hdr);
2679         encode_nops(&hdr);
2680 }
2681 
2682 #if defined(CONFIG_NFS_V4_1)
2683 /*
2684  * BIND_CONN_TO_SESSION request
2685  */
2686 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2687                                 struct xdr_stream *xdr,
2688                                 struct nfs_client *clp)
2689 {
2690         struct compound_hdr hdr = {
2691                 .minorversion = clp->cl_mvops->minor_version,
2692         };
2693 
2694         encode_compound_hdr(xdr, req, &hdr);
2695         encode_bind_conn_to_session(xdr, clp->cl_session, &hdr);
2696         encode_nops(&hdr);
2697 }
2698 
2699 /*
2700  * EXCHANGE_ID request
2701  */
2702 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2703                                      struct xdr_stream *xdr,
2704                                      struct nfs41_exchange_id_args *args)
2705 {
2706         struct compound_hdr hdr = {
2707                 .minorversion = args->client->cl_mvops->minor_version,
2708         };
2709 
2710         encode_compound_hdr(xdr, req, &hdr);
2711         encode_exchange_id(xdr, args, &hdr);
2712         encode_nops(&hdr);
2713 }
2714 
2715 /*
2716  * a CREATE_SESSION request
2717  */
2718 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2719                                         struct xdr_stream *xdr,
2720                                         struct nfs41_create_session_args *args)
2721 {
2722         struct compound_hdr hdr = {
2723                 .minorversion = args->client->cl_mvops->minor_version,
2724         };
2725 
2726         encode_compound_hdr(xdr, req, &hdr);
2727         encode_create_session(xdr, args, &hdr);
2728         encode_nops(&hdr);
2729 }
2730 
2731 /*
2732  * a DESTROY_SESSION request
2733  */
2734 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2735                                          struct xdr_stream *xdr,
2736                                          struct nfs4_session *session)
2737 {
2738         struct compound_hdr hdr = {
2739                 .minorversion = session->clp->cl_mvops->minor_version,
2740         };
2741 
2742         encode_compound_hdr(xdr, req, &hdr);
2743         encode_destroy_session(xdr, session, &hdr);
2744         encode_nops(&hdr);
2745 }
2746 
2747 /*
2748  * a DESTROY_CLIENTID request
2749  */
2750 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2751                                          struct xdr_stream *xdr,
2752                                          struct nfs_client *clp)
2753 {
2754         struct compound_hdr hdr = {
2755                 .minorversion = clp->cl_mvops->minor_version,
2756         };
2757 
2758         encode_compound_hdr(xdr, req, &hdr);
2759         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2760         encode_nops(&hdr);
2761 }
2762 
2763 /*
2764  * a SEQUENCE request
2765  */
2766 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2767                                   struct nfs4_sequence_args *args)
2768 {
2769         struct compound_hdr hdr = {
2770                 .minorversion = nfs4_xdr_minorversion(args),
2771         };
2772 
2773         encode_compound_hdr(xdr, req, &hdr);
2774         encode_sequence(xdr, args, &hdr);
2775         encode_nops(&hdr);
2776 }
2777 
2778 /*
2779  * a GET_LEASE_TIME request
2780  */
2781 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2782                                         struct xdr_stream *xdr,
2783                                         struct nfs4_get_lease_time_args *args)
2784 {
2785         struct compound_hdr hdr = {
2786                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2787         };
2788         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2789 
2790         encode_compound_hdr(xdr, req, &hdr);
2791         encode_sequence(xdr, &args->la_seq_args, &hdr);
2792         encode_putrootfh(xdr, &hdr);
2793         encode_fsinfo(xdr, lease_bitmap, &hdr);
2794         encode_nops(&hdr);
2795 }
2796 
2797 /*
2798  * a RECLAIM_COMPLETE request
2799  */
2800 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2801                                           struct xdr_stream *xdr,
2802                                 struct nfs41_reclaim_complete_args *args)
2803 {
2804         struct compound_hdr hdr = {
2805                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2806         };
2807 
2808         encode_compound_hdr(xdr, req, &hdr);
2809         encode_sequence(xdr, &args->seq_args, &hdr);
2810         encode_reclaim_complete(xdr, args, &hdr);
2811         encode_nops(&hdr);
2812 }
2813 
2814 /*
2815  * Encode GETDEVICELIST request
2816  */
2817 static void nfs4_xdr_enc_getdevicelist(struct rpc_rqst *req,
2818                                        struct xdr_stream *xdr,
2819                                        struct nfs4_getdevicelist_args *args)
2820 {
2821         struct compound_hdr hdr = {
2822                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2823         };
2824 
2825         encode_compound_hdr(xdr, req, &hdr);
2826         encode_sequence(xdr, &args->seq_args, &hdr);
2827         encode_putfh(xdr, args->fh, &hdr);
2828         encode_getdevicelist(xdr, args, &hdr);
2829         encode_nops(&hdr);
2830 }
2831 
2832 /*
2833  * Encode GETDEVICEINFO request
2834  */
2835 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
2836                                        struct xdr_stream *xdr,
2837                                        struct nfs4_getdeviceinfo_args *args)
2838 {
2839         struct compound_hdr hdr = {
2840                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2841         };
2842 
2843         encode_compound_hdr(xdr, req, &hdr);
2844         encode_sequence(xdr, &args->seq_args, &hdr);
2845         encode_getdeviceinfo(xdr, args, &hdr);
2846 
2847         /* set up reply kvec. Subtract notification bitmap max size (2)
2848          * so that notification bitmap is put in xdr_buf tail */
2849         xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
2850                          args->pdev->pages, args->pdev->pgbase,
2851                          args->pdev->pglen);
2852 
2853         encode_nops(&hdr);
2854 }
2855 
2856 /*
2857  *  Encode LAYOUTGET request
2858  */
2859 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
2860                                    struct xdr_stream *xdr,
2861                                    struct nfs4_layoutget_args *args)
2862 {
2863         struct compound_hdr hdr = {
2864                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2865         };
2866 
2867         encode_compound_hdr(xdr, req, &hdr);
2868         encode_sequence(xdr, &args->seq_args, &hdr);
2869         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2870         encode_layoutget(xdr, args, &hdr);
2871 
2872         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2873             args->layout.pages, 0, args->layout.pglen);
2874 
2875         encode_nops(&hdr);
2876 }
2877 
2878 /*
2879  *  Encode LAYOUTCOMMIT request
2880  */
2881 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
2882                                       struct xdr_stream *xdr,
2883                                       struct nfs4_layoutcommit_args *args)
2884 {
2885         struct nfs4_layoutcommit_data *data =
2886                 container_of(args, struct nfs4_layoutcommit_data, args);
2887         struct compound_hdr hdr = {
2888                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2889         };
2890 
2891         encode_compound_hdr(xdr, req, &hdr);
2892         encode_sequence(xdr, &args->seq_args, &hdr);
2893         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2894         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
2895         encode_getfattr(xdr, args->bitmask, &hdr);
2896         encode_nops(&hdr);
2897 }
2898 
2899 /*
2900  * Encode LAYOUTRETURN request
2901  */
2902 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
2903                                       struct xdr_stream *xdr,
2904                                       struct nfs4_layoutreturn_args *args)
2905 {
2906         struct compound_hdr hdr = {
2907                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2908         };
2909 
2910         encode_compound_hdr(xdr, req, &hdr);
2911         encode_sequence(xdr, &args->seq_args, &hdr);
2912         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
2913         encode_layoutreturn(xdr, args, &hdr);
2914         encode_nops(&hdr);
2915 }
2916 
2917 /*
2918  * Encode SECINFO_NO_NAME request
2919  */
2920 static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
2921                                         struct xdr_stream *xdr,
2922                                         struct nfs41_secinfo_no_name_args *args)
2923 {
2924         struct compound_hdr hdr = {
2925                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2926         };
2927 
2928         encode_compound_hdr(xdr, req, &hdr);
2929         encode_sequence(xdr, &args->seq_args, &hdr);
2930         encode_putrootfh(xdr, &hdr);
2931         encode_secinfo_no_name(xdr, args, &hdr);
2932         encode_nops(&hdr);
2933         return 0;
2934 }
2935 
2936 /*
2937  *  Encode TEST_STATEID request
2938  */
2939 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
2940                                       struct xdr_stream *xdr,
2941                                       struct nfs41_test_stateid_args *args)
2942 {
2943         struct compound_hdr hdr = {
2944                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2945         };
2946 
2947         encode_compound_hdr(xdr, req, &hdr);
2948         encode_sequence(xdr, &args->seq_args, &hdr);
2949         encode_test_stateid(xdr, args, &hdr);
2950         encode_nops(&hdr);
2951 }
2952 
2953 /*
2954  *  Encode FREE_STATEID request
2955  */
2956 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
2957                                      struct xdr_stream *xdr,
2958                                      struct nfs41_free_stateid_args *args)
2959 {
2960         struct compound_hdr hdr = {
2961                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2962         };
2963 
2964         encode_compound_hdr(xdr, req, &hdr);
2965         encode_sequence(xdr, &args->seq_args, &hdr);
2966         encode_free_stateid(xdr, args, &hdr);
2967         encode_nops(&hdr);
2968 }
2969 #endif /* CONFIG_NFS_V4_1 */
2970 
2971 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
2972 {
2973         dprintk("nfs: %s: prematurely hit end of receive buffer. "
2974                 "Remaining buffer length is %tu words.\n",
2975                 func, xdr->end - xdr->p);
2976 }
2977 
2978 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
2979 {
2980         __be32 *p;
2981 
2982         p = xdr_inline_decode(xdr, 4);
2983         if (unlikely(!p))
2984                 goto out_overflow;
2985         *len = be32_to_cpup(p);
2986         p = xdr_inline_decode(xdr, *len);
2987         if (unlikely(!p))
2988                 goto out_overflow;
2989         *string = (char *)p;
2990         return 0;
2991 out_overflow:
2992         print_overflow_msg(__func__, xdr);
2993         return -EIO;
2994 }
2995 
2996 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
2997 {
2998         __be32 *p;
2999 
3000         p = xdr_inline_decode(xdr, 8);
3001         if (unlikely(!p))
3002                 goto out_overflow;
3003         hdr->status = be32_to_cpup(p++);
3004         hdr->taglen = be32_to_cpup(p);
3005 
3006         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3007         if (unlikely(!p))
3008                 goto out_overflow;
3009         hdr->tag = (char *)p;
3010         p += XDR_QUADLEN(hdr->taglen);
3011         hdr->nops = be32_to_cpup(p);
3012         if (unlikely(hdr->nops < 1))
3013                 return nfs4_stat_to_errno(hdr->status);
3014         return 0;
3015 out_overflow:
3016         print_overflow_msg(__func__, xdr);
3017         return -EIO;
3018 }
3019 
3020 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3021 {
3022         __be32 *p;
3023         uint32_t opnum;
3024         int32_t nfserr;
3025 
3026         p = xdr_inline_decode(xdr, 8);
3027         if (unlikely(!p))
3028                 goto out_overflow;
3029         opnum = be32_to_cpup(p++);
3030         if (opnum != expected) {
3031                 dprintk("nfs: Server returned operation"
3032                         " %d but we issued a request for %d\n",
3033                                 opnum, expected);
3034                 return -EIO;
3035         }
3036         nfserr = be32_to_cpup(p);
3037         if (nfserr != NFS_OK)
3038                 return nfs4_stat_to_errno(nfserr);
3039         return 0;
3040 out_overflow:
3041         print_overflow_msg(__func__, xdr);
3042         return -EIO;
3043 }
3044 
3045 /* Dummy routine */
3046 static int decode_ace(struct xdr_stream *xdr, void *ace, struct nfs_client *clp)
3047 {
3048         __be32 *p;
3049         unsigned int strlen;
3050         char *str;
3051 
3052         p = xdr_inline_decode(xdr, 12);
3053         if (likely(p))
3054                 return decode_opaque_inline(xdr, &strlen, &str);
3055         print_overflow_msg(__func__, xdr);
3056         return -EIO;
3057 }
3058 
3059 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3060 {
3061         uint32_t bmlen;
3062         __be32 *p;
3063 
3064         p = xdr_inline_decode(xdr, 4);
3065         if (unlikely(!p))
3066                 goto out_overflow;
3067         bmlen = be32_to_cpup(p);
3068 
3069         bitmap[0] = bitmap[1] = bitmap[2] = 0;
3070         p = xdr_inline_decode(xdr, (bmlen << 2));
3071         if (unlikely(!p))
3072                 goto out_overflow;
3073         if (bmlen > 0) {
3074                 bitmap[0] = be32_to_cpup(p++);
3075                 if (bmlen > 1) {
3076                         bitmap[1] = be32_to_cpup(p++);
3077                         if (bmlen > 2)
3078                                 bitmap[2] = be32_to_cpup(p);
3079                 }
3080         }
3081         return 0;
3082 out_overflow:
3083         print_overflow_msg(__func__, xdr);
3084         return -EIO;
3085 }
3086 
3087 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3088 {
3089         __be32 *p;
3090 
3091         p = xdr_inline_decode(xdr, 4);
3092         if (unlikely(!p))
3093                 goto out_overflow;
3094         *attrlen = be32_to_cpup(p);
3095         *savep = xdr_stream_pos(xdr);
3096         return 0;
3097 out_overflow:
3098         print_overflow_msg(__func__, xdr);
3099         return -EIO;
3100 }
3101 
3102 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3103 {
3104         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3105                 int ret;
3106                 ret = decode_attr_bitmap(xdr, bitmask);
3107                 if (unlikely(ret < 0))
3108                         return ret;
3109                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3110         } else
3111                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3112         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3113                 bitmask[0], bitmask[1], bitmask[2]);
3114         return 0;
3115 }
3116 
3117 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3118 {
3119         __be32 *p;
3120         int ret = 0;
3121 
3122         *type = 0;
3123         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3124                 return -EIO;
3125         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3126                 p = xdr_inline_decode(xdr, 4);
3127                 if (unlikely(!p))
3128                         goto out_overflow;
3129                 *type = be32_to_cpup(p);
3130                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3131                         dprintk("%s: bad type %d\n", __func__, *type);
3132                         return -EIO;
3133                 }
3134                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3135                 ret = NFS_ATTR_FATTR_TYPE;
3136         }
3137         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3138         return ret;
3139 out_overflow:
3140         print_overflow_msg(__func__, xdr);
3141         return -EIO;
3142 }
3143 
3144 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3145                                       uint32_t *bitmap, uint32_t *type)
3146 {
3147         __be32 *p;
3148 
3149         *type = 0;
3150         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3151                 return -EIO;
3152         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3153                 p = xdr_inline_decode(xdr, 4);
3154                 if (unlikely(!p))
3155                         goto out_overflow;
3156                 *type = be32_to_cpup(p);
3157                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3158         }
3159         dprintk("%s: expire type=0x%x\n", __func__, *type);
3160         return 0;
3161 out_overflow:
3162         print_overflow_msg(__func__, xdr);
3163         return -EIO;
3164 }
3165 
3166 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3167 {
3168         __be32 *p;
3169         int ret = 0;
3170 
3171         *change = 0;
3172         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3173                 return -EIO;
3174         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3175                 p = xdr_inline_decode(xdr, 8);
3176                 if (unlikely(!p))
3177                         goto out_overflow;
3178                 xdr_decode_hyper(p, change);
3179                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3180                 ret = NFS_ATTR_FATTR_CHANGE;
3181         }
3182         dprintk("%s: change attribute=%Lu\n", __func__,
3183                         (unsigned long long)*change);
3184         return ret;
3185 out_overflow:
3186         print_overflow_msg(__func__, xdr);
3187         return -EIO;
3188 }
3189 
3190 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3191 {
3192         __be32 *p;
3193         int ret = 0;
3194 
3195         *size = 0;
3196         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3197                 return -EIO;
3198         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3199                 p = xdr_inline_decode(xdr, 8);
3200                 if (unlikely(!p))
3201                         goto out_overflow;
3202                 xdr_decode_hyper(p, size);
3203                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3204                 ret = NFS_ATTR_FATTR_SIZE;
3205         }
3206         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3207         return ret;
3208 out_overflow:
3209         print_overflow_msg(__func__, xdr);
3210         return -EIO;
3211 }
3212 
3213 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3214 {
3215         __be32 *p;
3216 
3217         *res = 0;
3218         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3219                 return -EIO;
3220         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3221                 p = xdr_inline_decode(xdr, 4);
3222                 if (unlikely(!p))
3223                         goto out_overflow;
3224                 *res = be32_to_cpup(p);
3225                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3226         }
3227         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3228         return 0;
3229 out_overflow:
3230         print_overflow_msg(__func__, xdr);
3231         return -EIO;
3232 }
3233 
3234 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3235 {
3236         __be32 *p;
3237 
3238         *res = 0;
3239         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3240                 return -EIO;
3241         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3242                 p = xdr_inline_decode(xdr, 4);
3243                 if (unlikely(!p))
3244                         goto out_overflow;
3245                 *res = be32_to_cpup(p);
3246                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3247         }
3248         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3249         return 0;
3250 out_overflow:
3251         print_overflow_msg(__func__, xdr);
3252         return -EIO;
3253 }
3254 
3255 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3256 {
3257         __be32 *p;
3258         int ret = 0;
3259 
3260         fsid->major = 0;
3261         fsid->minor = 0;
3262         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3263                 return -EIO;
3264         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3265                 p = xdr_inline_decode(xdr, 16);
3266                 if (unlikely(!p))
3267                         goto out_overflow;
3268                 p = xdr_decode_hyper(p, &fsid->major);
3269                 xdr_decode_hyper(p, &fsid->minor);
3270                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3271                 ret = NFS_ATTR_FATTR_FSID;
3272         }
3273         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3274                         (unsigned long long)fsid->major,
3275                         (unsigned long long)fsid->minor);
3276         return ret;
3277 out_overflow:
3278         print_overflow_msg(__func__, xdr);
3279         return -EIO;
3280 }
3281 
3282 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3283 {
3284         __be32 *p;
3285 
3286         *res = 60;
3287         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3288                 return -EIO;
3289         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3290                 p = xdr_inline_decode(xdr, 4);
3291                 if (unlikely(!p))
3292                         goto out_overflow;
3293                 *res = be32_to_cpup(p);
3294                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3295         }
3296         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3297         return 0;
3298 out_overflow:
3299         print_overflow_msg(__func__, xdr);
3300         return -EIO;
3301 }
3302 
3303 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3304 {
3305         __be32 *p;
3306 
3307         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3308                 return -EIO;
3309         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3310                 p = xdr_inline_decode(xdr, 4);
3311                 if (unlikely(!p))
3312                         goto out_overflow;
3313                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3314                 *res = -be32_to_cpup(p);
3315         }
3316         return 0;
3317 out_overflow:
3318         print_overflow_msg(__func__, xdr);
3319         return -EIO;
3320 }
3321 
3322 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3323 {
3324         __be32 *p;
3325         int len;
3326 
3327         if (fh != NULL)
3328                 memset(fh, 0, sizeof(*fh));
3329 
3330         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3331                 return -EIO;
3332         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3333                 p = xdr_inline_decode(xdr, 4);
3334                 if (unlikely(!p))
3335                         goto out_overflow;
3336                 len = be32_to_cpup(p);
3337                 if (len > NFS4_FHSIZE)
3338                         return -EIO;
3339                 p = xdr_inline_decode(xdr, len);
3340                 if (unlikely(!p))
3341                         goto out_overflow;
3342                 if (fh != NULL) {
3343                         memcpy(fh->data, p, len);
3344                         fh->size = len;
3345                 }
3346                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3347         }
3348         return 0;
3349 out_overflow:
3350         print_overflow_msg(__func__, xdr);
3351         return -EIO;
3352 }
3353 
3354 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3355 {
3356         __be32 *p;
3357 
3358         *res = ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL;
3359         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3360                 return -EIO;
3361         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3362                 p = xdr_inline_decode(xdr, 4);
3363                 if (unlikely(!p))
3364                         goto out_overflow;
3365                 *res = be32_to_cpup(p);
3366                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3367         }
3368         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3369         return 0;
3370 out_overflow:
3371         print_overflow_msg(__func__, xdr);
3372         return -EIO;
3373 }
3374 
3375 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3376 {
3377         __be32 *p;
3378         int ret = 0;
3379 
3380         *fileid = 0;
3381         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3382                 return -EIO;
3383         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3384                 p = xdr_inline_decode(xdr, 8);
3385                 if (unlikely(!p))
3386                         goto out_overflow;
3387                 xdr_decode_hyper(p, fileid);
3388                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3389                 ret = NFS_ATTR_FATTR_FILEID;
3390         }
3391         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3392         return ret;
3393 out_overflow:
3394         print_overflow_msg(__func__, xdr);
3395         return -EIO;
3396 }
3397 
3398 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3399 {
3400         __be32 *p;
3401         int ret = 0;
3402 
3403         *fileid = 0;
3404         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3405                 return -EIO;
3406         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3407                 p = xdr_inline_decode(xdr, 8);
3408                 if (unlikely(!p))
3409                         goto out_overflow;
3410                 xdr_decode_hyper(p, fileid);
3411                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3412                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3413         }
3414         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3415         return ret;
3416 out_overflow:
3417         print_overflow_msg(__func__, xdr);
3418         return -EIO;
3419 }
3420 
3421 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3422 {
3423         __be32 *p;
3424         int status = 0;
3425 
3426         *res = 0;
3427         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3428                 return -EIO;
3429         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3430                 p = xdr_inline_decode(xdr, 8);
3431                 if (unlikely(!p))
3432                         goto out_overflow;
3433                 xdr_decode_hyper(p, res);
3434                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3435         }
3436         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3437         return status;
3438 out_overflow:
3439         print_overflow_msg(__func__, xdr);
3440         return -EIO;
3441 }
3442 
3443 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3444 {
3445         __be32 *p;
3446         int status = 0;
3447 
3448         *res = 0;
3449         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3450                 return -EIO;
3451         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3452                 p = xdr_inline_decode(xdr, 8);
3453                 if (unlikely(!p))
3454                         goto out_overflow;
3455                 xdr_decode_hyper(p, res);
3456                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3457         }
3458         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3459         return status;
3460 out_overflow:
3461         print_overflow_msg(__func__, xdr);
3462         return -EIO;
3463 }
3464 
3465 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3466 {
3467         __be32 *p;
3468         int status = 0;
3469 
3470         *res = 0;
3471         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3472                 return -EIO;
3473         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3474                 p = xdr_inline_decode(xdr, 8);
3475                 if (unlikely(!p))
3476                         goto out_overflow;
3477                 xdr_decode_hyper(p, res);
3478                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3479         }
3480         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3481         return status;
3482 out_overflow:
3483         print_overflow_msg(__func__, xdr);
3484         return -EIO;
3485 }
3486 
3487 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3488 {
3489         u32 n;
3490         __be32 *p;
3491         int status = 0;
3492 
3493         p = xdr_inline_decode(xdr, 4);
3494         if (unlikely(!p))
3495                 goto out_overflow;
3496         n = be32_to_cpup(p);
3497         if (n == 0)
3498                 goto root_path;
3499         dprintk("pathname4: ");
3500         path->ncomponents = 0;
3501         while (path->ncomponents < n) {
3502                 struct nfs4_string *component = &path->components[path->ncomponents];
3503                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3504                 if (unlikely(status != 0))
3505                         goto out_eio;
3506                 ifdebug (XDR)
3507                         pr_cont("%s%.*s ",
3508                                 (path->ncomponents != n ? "/ " : ""),
3509                                 component->len, component->data);
3510                 if (path->ncomponents < NFS4_PATHNAME_MAXCOMPONENTS)
3511                         path->ncomponents++;
3512                 else {
3513                         dprintk("cannot parse %d components in path\n", n);
3514                         goto out_eio;
3515                 }
3516         }
3517 out:
3518         return status;
3519 root_path:
3520 /* a root pathname is sent as a zero component4 */
3521         path->ncomponents = 1;
3522         path->components[0].len=0;
3523         path->components[0].data=NULL;
3524         dprintk("pathname4: /\n");
3525         goto out;
3526 out_eio:
3527         dprintk(" status %d", status);
3528         status = -EIO;
3529         goto out;
3530 out_overflow:
3531         print_overflow_msg(__func__, xdr);
3532         return -EIO;
3533 }
3534 
3535 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3536 {
3537         int n;
3538         __be32 *p;
3539         int status = -EIO;
3540 
3541         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3542                 goto out;
3543         status = 0;
3544         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3545                 goto out;
3546         status = -EIO;
3547         /* Ignore borken servers that return unrequested attrs */
3548         if (unlikely(res == NULL))
3549                 goto out;
3550         dprintk("%s: fsroot:\n", __func__);
3551         status = decode_pathname(xdr, &res->fs_path);
3552         if (unlikely(status != 0))
3553                 goto out;
3554         p = xdr_inline_decode(xdr, 4);
3555         if (unlikely(!p))
3556                 goto out_overflow;
3557         n = be32_to_cpup(p);
3558         if (n <= 0)
3559                 goto out_eio;
3560         res->nlocations = 0;
3561         while (res->nlocations < n) {
3562                 u32 m;
3563                 struct nfs4_fs_location *loc = &res->locations[res->nlocations];
3564 
3565                 p = xdr_inline_decode(xdr, 4);
3566                 if (unlikely(!p))
3567                         goto out_overflow;
3568                 m = be32_to_cpup(p);
3569 
3570                 loc->nservers = 0;
3571                 dprintk("%s: servers:\n", __func__);
3572                 while (loc->nservers < m) {
3573                         struct nfs4_string *server = &loc->servers[loc->nservers];
3574                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3575                         if (unlikely(status != 0))
3576                                 goto out_eio;
3577                         dprintk("%s ", server->data);
3578                         if (loc->nservers < NFS4_FS_LOCATION_MAXSERVERS)
3579                                 loc->nservers++;
3580                         else {
3581                                 unsigned int i;
3582                                 dprintk("%s: using first %u of %u servers "
3583                                         "returned for location %u\n",
3584                                                 __func__,
3585                                                 NFS4_FS_LOCATION_MAXSERVERS,
3586                                                 m, res->nlocations);
3587                                 for (i = loc->nservers; i < m; i++) {
3588                                         unsigned int len;
3589                                         char *data;
3590                                         status = decode_opaque_inline(xdr, &len, &data);
3591                                         if (unlikely(status != 0))
3592                                                 goto out_eio;
3593                                 }
3594                         }
3595                 }
3596                 status = decode_pathname(xdr, &loc->rootpath);
3597                 if (unlikely(status != 0))
3598                         goto out_eio;
3599                 if (res->nlocations < NFS4_FS_LOCATIONS_MAXENTRIES)
3600                         res->nlocations++;
3601         }
3602         if (res->nlocations != 0)
3603                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3604 out:
3605         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3606         return status;
3607 out_overflow:
3608         print_overflow_msg(__func__, xdr);
3609 out_eio:
3610         status = -EIO;
3611         goto out;
3612 }
3613 
3614 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3615 {
3616         __be32 *p;
3617         int status = 0;
3618 
3619         *res = 0;
3620         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3621                 return -EIO;
3622         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3623                 p = xdr_inline_decode(xdr, 8);
3624                 if (unlikely(!p))
3625                         goto out_overflow;
3626                 xdr_decode_hyper(p, res);
3627                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3628         }
3629         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3630         return status;
3631 out_overflow:
3632         print_overflow_msg(__func__, xdr);
3633         return -EIO;
3634 }
3635 
3636 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3637 {
3638         __be32 *p;
3639         int status = 0;
3640 
3641         *maxlink = 1;
3642         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3643                 return -EIO;
3644         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3645                 p = xdr_inline_decode(xdr, 4);
3646                 if (unlikely(!p))
3647                         goto out_overflow;
3648                 *maxlink = be32_to_cpup(p);
3649                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3650         }
3651         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3652         return status;
3653 out_overflow:
3654         print_overflow_msg(__func__, xdr);
3655         return -EIO;
3656 }
3657 
3658 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3659 {
3660         __be32 *p;
3661         int status = 0;
3662 
3663         *maxname = 1024;
3664         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3665                 return -EIO;
3666         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3667                 p = xdr_inline_decode(xdr, 4);
3668                 if (unlikely(!p))
3669                         goto out_overflow;
3670                 *maxname = be32_to_cpup(p);
3671                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3672         }
3673         dprintk("%s: maxname=%u\n", __func__, *maxname);
3674         return status;
3675 out_overflow:
3676         print_overflow_msg(__func__, xdr);
3677         return -EIO;
3678 }
3679 
3680 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3681 {
3682         __be32 *p;
3683         int status = 0;
3684 
3685         *res = 1024;
3686         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3687                 return -EIO;
3688         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3689                 uint64_t maxread;
3690                 p = xdr_inline_decode(xdr, 8);
3691                 if (unlikely(!p))
3692                         goto out_overflow;
3693                 xdr_decode_hyper(p, &maxread);
3694                 if (maxread > 0x7FFFFFFF)
3695                         maxread = 0x7FFFFFFF;
3696                 *res = (uint32_t)maxread;
3697                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3698         }
3699         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3700         return status;
3701 out_overflow:
3702         print_overflow_msg(__func__, xdr);
3703         return -EIO;
3704 }
3705 
3706 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3707 {
3708         __be32 *p;
3709         int status = 0;
3710 
3711         *res = 1024;
3712         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3713                 return -EIO;
3714         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3715                 uint64_t maxwrite;
3716                 p = xdr_inline_decode(xdr, 8);
3717                 if (unlikely(!p))
3718                         goto out_overflow;
3719                 xdr_decode_hyper(p, &maxwrite);
3720                 if (maxwrite > 0x7FFFFFFF)
3721                         maxwrite = 0x7FFFFFFF;
3722                 *res = (uint32_t)maxwrite;
3723                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3724         }
3725         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3726         return status;
3727 out_overflow:
3728         print_overflow_msg(__func__, xdr);
3729         return -EIO;
3730 }
3731 
3732 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3733 {
3734         uint32_t tmp;
3735         __be32 *p;
3736         int ret = 0;
3737 
3738         *mode = 0;
3739         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3740                 return -EIO;
3741         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3742                 p = xdr_inline_decode(xdr, 4);
3743                 if (unlikely(!p))
3744                         goto out_overflow;
3745                 tmp = be32_to_cpup(p);
3746                 *mode = tmp & ~S_IFMT;
3747                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3748                 ret = NFS_ATTR_FATTR_MODE;
3749         }
3750         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3751         return ret;
3752 out_overflow:
3753         print_overflow_msg(__func__, xdr);
3754         return -EIO;
3755 }
3756 
3757 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3758 {
3759         __be32 *p;
3760         int ret = 0;
3761 
3762         *nlink = 1;
3763         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3764                 return -EIO;
3765         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3766                 p = xdr_inline_decode(xdr, 4);
3767                 if (unlikely(!p))
3768                         goto out_overflow;
3769                 *nlink = be32_to_cpup(p);
3770                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3771                 ret = NFS_ATTR_FATTR_NLINK;
3772         }
3773         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3774         return ret;
3775 out_overflow:
3776         print_overflow_msg(__func__, xdr);
3777         return -EIO;
3778 }
3779 
3780 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3781                 const struct nfs_server *server, uint32_t *uid,
3782                 struct nfs4_string *owner_name)
3783 {
3784         uint32_t len;
3785         __be32 *p;
3786         int ret = 0;
3787 
3788         *uid = -2;
3789         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3790                 return -EIO;
3791         if (likely(bitmap[1] & FATTR4_WORD1_OWNER)) {
3792                 p = xdr_inline_decode(xdr, 4);
3793                 if (unlikely(!p))
3794                         goto out_overflow;
3795                 len = be32_to_cpup(p);
3796                 p = xdr_inline_decode(xdr, len);
3797                 if (unlikely(!p))
3798                         goto out_overflow;
3799                 if (owner_name != NULL) {
3800                         owner_name->data = kmemdup(p, len, GFP_NOWAIT);
3801                         if (owner_name->data != NULL) {
3802                                 owner_name->len = len;
3803                                 ret = NFS_ATTR_FATTR_OWNER_NAME;
3804                         }
3805                 } else if (len < XDR_MAX_NETOBJ) {
3806                         if (nfs_map_name_to_uid(server, (char *)p, len, uid) == 0)
3807                                 ret = NFS_ATTR_FATTR_OWNER;
3808                         else
3809                                 dprintk("%s: nfs_map_name_to_uid failed!\n",
3810                                                 __func__);
3811                 } else
3812                         dprintk("%s: name too long (%u)!\n",
3813                                         __func__, len);
3814                 bitmap[1] &= ~FATTR4_WORD1_OWNER;
3815         }
3816         dprintk("%s: uid=%d\n", __func__, (int)*uid);
3817         return ret;
3818 out_overflow:
3819         print_overflow_msg(__func__, xdr);
3820         return -EIO;
3821 }
3822 
3823 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3824                 const struct nfs_server *server, uint32_t *gid,
3825                 struct nfs4_string *group_name)
3826 {
3827         uint32_t len;
3828         __be32 *p;
3829         int ret = 0;
3830 
3831         *gid = -2;
3832         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3833                 return -EIO;
3834         if (likely(bitmap[1] & FATTR4_WORD1_OWNER_GROUP)) {
3835                 p = xdr_inline_decode(xdr, 4);
3836                 if (unlikely(!p))
3837                         goto out_overflow;
3838                 len = be32_to_cpup(p);
3839                 p = xdr_inline_decode(xdr, len);
3840                 if (unlikely(!p))
3841                         goto out_overflow;
3842                 if (group_name != NULL) {
3843                         group_name->data = kmemdup(p, len, GFP_NOWAIT);
3844                         if (group_name->data != NULL) {
3845                                 group_name->len = len;
3846                                 ret = NFS_ATTR_FATTR_GROUP_NAME;
3847                         }
3848                 } else if (len < XDR_MAX_NETOBJ) {
3849                         if (nfs_map_group_to_gid(server, (char *)p, len, gid) == 0)
3850                                 ret = NFS_ATTR_FATTR_GROUP;
3851                         else
3852                                 dprintk("%s: nfs_map_group_to_gid failed!\n",
3853                                                 __func__);
3854                 } else
3855                         dprintk("%s: name too long (%u)!\n",
3856                                         __func__, len);
3857                 bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3858         }
3859         dprintk("%s: gid=%d\n", __func__, (int)*gid);
3860         return ret;
3861 out_overflow:
3862         print_overflow_msg(__func__, xdr);
3863         return -EIO;
3864 }
3865 
3866 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3867 {
3868         uint32_t major = 0, minor = 0;
3869         __be32 *p;
3870         int ret = 0;
3871 
3872         *rdev = MKDEV(0,0);
3873         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3874                 return -EIO;
3875         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3876                 dev_t tmp;
3877 
3878                 p = xdr_inline_decode(xdr, 8);
3879                 if (unlikely(!p))
3880                         goto out_overflow;
3881                 major = be32_to_cpup(p++);
3882                 minor = be32_to_cpup(p);
3883                 tmp = MKDEV(major, minor);
3884                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3885                         *rdev = tmp;
3886                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3887                 ret = NFS_ATTR_FATTR_RDEV;
3888         }
3889         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3890         return ret;
3891 out_overflow:
3892         print_overflow_msg(__func__, xdr);
3893         return -EIO;
3894 }
3895 
3896 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3897 {
3898         __be32 *p;
3899         int status = 0;
3900 
3901         *res = 0;
3902         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3903                 return -EIO;
3904         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3905                 p = xdr_inline_decode(xdr, 8);
3906                 if (unlikely(!p))
3907                         goto out_overflow;
3908                 xdr_decode_hyper(p, res);
3909                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3910         }
3911         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3912         return status;
3913 out_overflow:
3914         print_overflow_msg(__func__, xdr);
3915         return -EIO;
3916 }
3917 
3918 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3919 {
3920         __be32 *p;
3921         int status = 0;
3922 
3923         *res = 0;
3924         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
3925                 return -EIO;
3926         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
3927                 p = xdr_inline_decode(xdr, 8);
3928                 if (unlikely(!p))
3929                         goto out_overflow;
3930                 xdr_decode_hyper(p, res);
3931                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
3932         }
3933         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
3934         return status;
3935 out_overflow:
3936         print_overflow_msg(__func__, xdr);
3937         return -EIO;
3938 }
3939 
3940 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3941 {
3942         __be32 *p;
3943         int status = 0;
3944 
3945         *res = 0;
3946         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
3947                 return -EIO;
3948         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
3949                 p = xdr_inline_decode(xdr, 8);
3950                 if (unlikely(!p))
3951                         goto out_overflow;
3952                 xdr_decode_hyper(p, res);
3953                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
3954         }
3955         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
3956         return status;
3957 out_overflow:
3958         print_overflow_msg(__func__, xdr);
3959         return -EIO;
3960 }
3961 
3962 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
3963 {
3964         __be32 *p;
3965         int ret = 0;
3966 
3967         *used = 0;
3968         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
3969                 return -EIO;
3970         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
3971                 p = xdr_inline_decode(xdr, 8);
3972                 if (unlikely(!p))
3973                         goto out_overflow;
3974                 xdr_decode_hyper(p, used);
3975                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
3976                 ret = NFS_ATTR_FATTR_SPACE_USED;
3977         }
3978         dprintk("%s: space used=%Lu\n", __func__,
3979                         (unsigned long long)*used);
3980         return ret;
3981 out_overflow:
3982         print_overflow_msg(__func__, xdr);
3983         return -EIO;
3984 }
3985 
3986 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
3987 {
3988         __be32 *p;
3989         uint64_t sec;
3990         uint32_t nsec;
3991 
3992         p = xdr_inline_decode(xdr, 12);
3993         if (unlikely(!p))
3994                 goto out_overflow;
3995         p = xdr_decode_hyper(p, &sec);
3996         nsec = be32_to_cpup(p);
3997         time->tv_sec = (time_t)sec;
3998         time->tv_nsec = (long)nsec;
3999         return 0;
4000 out_overflow:
4001         print_overflow_msg(__func__, xdr);
4002         return -EIO;
4003 }
4004 
4005 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4006 {
4007         int status = 0;
4008 
4009         time->tv_sec = 0;
4010         time->tv_nsec = 0;
4011         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4012                 return -EIO;
4013         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4014                 status = decode_attr_time(xdr, time);
4015                 if (status == 0)
4016                         status = NFS_ATTR_FATTR_ATIME;
4017                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4018         }
4019         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4020         return status;
4021 }
4022 
4023 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4024 {
4025         int status = 0;
4026 
4027         time->tv_sec = 0;
4028         time->tv_nsec = 0;
4029         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4030                 return -EIO;
4031         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4032                 status = decode_attr_time(xdr, time);
4033                 if (status == 0)
4034                         status = NFS_ATTR_FATTR_CTIME;
4035                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4036         }
4037         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4038         return status;
4039 }
4040 
4041 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4042                                   struct timespec *time)
4043 {
4044         int status = 0;
4045 
4046         time->tv_sec = 0;
4047         time->tv_nsec = 0;
4048         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4049                 return -EIO;
4050         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4051                 status = decode_attr_time(xdr, time);
4052                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4053         }
4054         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4055                 (long)time->tv_nsec);
4056         return status;
4057 }
4058 
4059 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4060 {
4061         int status = 0;
4062 
4063         time->tv_sec = 0;
4064         time->tv_nsec = 0;
4065         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4066                 return -EIO;
4067         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4068                 status = decode_attr_time(xdr, time);
4069                 if (status == 0)
4070                         status = NFS_ATTR_FATTR_MTIME;
4071                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4072         }
4073         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4074         return status;
4075 }
4076 
4077 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4078 {
4079         unsigned int attrwords = XDR_QUADLEN(attrlen);
4080         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4081 
4082         if (unlikely(attrwords != nwords)) {
4083                 dprintk("%s: server returned incorrect attribute length: "
4084                         "%u %c %u\n",
4085                                 __func__,
4086                                 attrwords << 2,
4087                                 (attrwords < nwords) ? '<' : '>',
4088                                 nwords << 2);
4089                 return -EIO;
4090         }
4091         return 0;
4092 }
4093 
4094 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4095 {
4096         __be32 *p;
4097 
4098         p = xdr_inline_decode(xdr, 20);
4099         if (unlikely(!p))
4100                 goto out_overflow;
4101         cinfo->atomic = be32_to_cpup(p++);
4102         p = xdr_decode_hyper(p, &cinfo->before);
4103         xdr_decode_hyper(p, &cinfo->after);
4104         return 0;
4105 out_overflow:
4106         print_overflow_msg(__func__, xdr);
4107         return -EIO;
4108 }
4109 
4110 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4111 {
4112         __be32 *p;
4113         uint32_t supp, acc;
4114         int status;
4115 
4116         status = decode_op_hdr(xdr, OP_ACCESS);
4117         if (status)
4118                 return status;
4119         p = xdr_inline_decode(xdr, 8);
4120         if (unlikely(!p))
4121                 goto out_overflow;
4122         supp = be32_to_cpup(p++);
4123         acc = be32_to_cpup(p);
4124         *supported = supp;
4125         *access = acc;
4126         return 0;
4127 out_overflow:
4128         print_overflow_msg(__func__, xdr);
4129         return -EIO;
4130 }
4131 
4132 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4133 {
4134         __be32 *p;
4135 
4136         p = xdr_inline_decode(xdr, len);
4137         if (likely(p)) {
4138                 memcpy(buf, p, len);
4139                 return 0;
4140         }
4141         print_overflow_msg(__func__, xdr);
4142         return -EIO;
4143 }
4144 
4145 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4146 {
4147         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4148 }
4149 
4150 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4151 {
4152         int status;
4153 
4154         status = decode_op_hdr(xdr, OP_CLOSE);
4155         if (status != -EIO)
4156                 nfs_increment_open_seqid(status, res->seqid);
4157         if (!status)
4158                 status = decode_stateid(xdr, &res->stateid);
4159         return status;
4160 }
4161 
4162 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4163 {
4164         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4165 }
4166 
4167 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4168 {
4169         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4170 }
4171 
4172 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4173 {
4174         int status;
4175 
4176         status = decode_op_hdr(xdr, OP_COMMIT);
4177         if (!status)
4178                 status = decode_write_verifier(xdr, &res->verf->verifier);
4179         return status;
4180 }
4181 
4182 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4183 {
4184         __be32 *p;
4185         uint32_t bmlen;
4186         int status;
4187 
4188         status = decode_op_hdr(xdr, OP_CREATE);
4189         if (status)
4190                 return status;
4191         if ((status = decode_change_info(xdr, cinfo)))
4192                 return status;
4193         p = xdr_inline_decode(xdr, 4);
4194         if (unlikely(!p))
4195                 goto out_overflow;
4196         bmlen = be32_to_cpup(p);
4197         p = xdr_inline_decode(xdr, bmlen << 2);
4198         if (likely(p))
4199                 return 0;
4200 out_overflow:
4201         print_overflow_msg(__func__, xdr);
4202         return -EIO;
4203 }
4204 
4205 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4206 {
4207         unsigned int savep;
4208         uint32_t attrlen, bitmap[3] = {0};
4209         int status;
4210 
4211         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4212                 goto xdr_error;
4213         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4214                 goto xdr_error;
4215         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4216                 goto xdr_error;
4217         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4218                 goto xdr_error;
4219         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4220                                                  &res->fh_expire_type)) != 0)
4221                 goto xdr_error;
4222         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4223                 goto xdr_error;
4224         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4225                 goto xdr_error;
4226         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4227                 goto xdr_error;
4228         status = verify_attr_len(xdr, savep, attrlen);
4229 xdr_error:
4230         dprintk("%s: xdr returned %d!\n", __func__, -status);
4231         return status;
4232 }
4233 
4234 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4235 {
4236         unsigned int savep;
4237         uint32_t attrlen, bitmap[3] = {0};
4238         int status;
4239 
4240         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4241                 goto xdr_error;
4242         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4243                 goto xdr_error;
4244         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4245                 goto xdr_error;
4246 
4247         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4248                 goto xdr_error;
4249         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4250                 goto xdr_error;
4251         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4252                 goto xdr_error;
4253         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4254                 goto xdr_error;
4255         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4256                 goto xdr_error;
4257         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4258                 goto xdr_error;
4259 
4260         status = verify_attr_len(xdr, savep, attrlen);
4261 xdr_error:
4262         dprintk("%s: xdr returned %d!\n", __func__, -status);
4263         return status;
4264 }
4265 
4266 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4267 {
4268         unsigned int savep;
4269         uint32_t attrlen, bitmap[3] = {0};
4270         int status;
4271 
4272         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4273                 goto xdr_error;
4274         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4275                 goto xdr_error;
4276         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4277                 goto xdr_error;
4278 
4279         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4280                 goto xdr_error;
4281         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4282                 goto xdr_error;
4283 
4284         status = verify_attr_len(xdr, savep, attrlen);
4285 xdr_error:
4286         dprintk("%s: xdr returned %d!\n", __func__, -status);
4287         return status;
4288 }
4289 
4290 static int decode_threshold_hint(struct xdr_stream *xdr,
4291                                   uint32_t *bitmap,
4292                                   uint64_t *res,
4293                                   uint32_t hint_bit)
4294 {
4295         __be32 *p;
4296 
4297         *res = 0;
4298         if (likely(bitmap[0] & hint_bit)) {
4299                 p = xdr_inline_decode(xdr, 8);
4300                 if (unlikely(!p))
4301                         goto out_overflow;
4302                 xdr_decode_hyper(p, res);
4303         }
4304         return 0;
4305 out_overflow:
4306         print_overflow_msg(__func__, xdr);
4307         return -EIO;
4308 }
4309 
4310 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4311                                         struct nfs4_threshold *res)
4312 {
4313         __be32 *p;
4314         unsigned int savep;
4315         uint32_t bitmap[3] = {0,}, attrlen;
4316         int status;
4317 
4318         /* layout type */
4319         p = xdr_inline_decode(xdr, 4);
4320         if (unlikely(!p)) {
4321                 print_overflow_msg(__func__, xdr);
4322                 return -EIO;
4323         }
4324         res->l_type = be32_to_cpup(p);
4325 
4326         /* thi_hintset bitmap */
4327         status = decode_attr_bitmap(xdr, bitmap);
4328         if (status < 0)
4329                 goto xdr_error;
4330 
4331         /* thi_hintlist length */
4332         status = decode_attr_length(xdr, &attrlen, &savep);
4333         if (status < 0)
4334                 goto xdr_error;
4335         /* thi_hintlist */
4336         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4337         if (status < 0)
4338                 goto xdr_error;
4339         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4340         if (status < 0)
4341                 goto xdr_error;
4342         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4343                                        THRESHOLD_RD_IO);
4344         if (status < 0)
4345                 goto xdr_error;
4346         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4347                                        THRESHOLD_WR_IO);
4348         if (status < 0)
4349                 goto xdr_error;
4350 
4351         status = verify_attr_len(xdr, savep, attrlen);
4352         res->bm = bitmap[0];
4353 
4354         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4355                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4356                 res->wr_io_sz);
4357 xdr_error:
4358         dprintk("%s ret=%d!\n", __func__, status);
4359         return status;
4360 }
4361 
4362 /*
4363  * Thresholds on pNFS direct I/O vrs MDS I/O
4364  */
4365 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4366                                     uint32_t *bitmap,
4367                                     struct nfs4_threshold *res)
4368 {
4369         __be32 *p;
4370         int status = 0;
4371         uint32_t num;
4372 
4373         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4374                 return -EIO;
4375         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4376                 /* Did the server return an unrequested attribute? */
4377                 if (unlikely(res == NULL))
4378                         return -EREMOTEIO;
4379                 p = xdr_inline_decode(xdr, 4);
4380                 if (unlikely(!p))
4381                         goto out_overflow;
4382                 num = be32_to_cpup(p);
4383                 if (num == 0)
4384                         return 0;
4385                 if (num > 1)
4386                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4387                                 "drivers per filesystem not supported\n",
4388                                 __func__);
4389 
4390                 status = decode_first_threshold_item4(xdr, res);
4391                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4392         }
4393         return status;
4394 out_overflow:
4395         print_overflow_msg(__func__, xdr);
4396         return -EIO;
4397 }
4398 
4399 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4400                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4401                 struct nfs4_fs_locations *fs_loc,
4402                 const struct nfs_server *server)
4403 {
4404         int status;
4405         umode_t fmode = 0;
4406         uint32_t type;
4407         int32_t err;
4408 
4409         status = decode_attr_type(xdr, bitmap, &type);
4410         if (status < 0)
4411                 goto xdr_error;
4412         fattr->mode = 0;
4413         if (status != 0) {
4414                 fattr->mode |= nfs_type2fmt[type];
4415                 fattr->valid |= status;
4416         }
4417 
4418         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4419         if (status < 0)
4420                 goto xdr_error;
4421         fattr->valid |= status;
4422 
4423         status = decode_attr_size(xdr, bitmap, &fattr->size);
4424         if (status < 0)
4425                 goto xdr_error;
4426         fattr->valid |= status;
4427 
4428         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4429         if (status < 0)
4430                 goto xdr_error;
4431         fattr->valid |= status;
4432 
4433         err = 0;
4434         status = decode_attr_error(xdr, bitmap, &err);
4435         if (status < 0)
4436                 goto xdr_error;
4437 
4438         status = decode_attr_filehandle(xdr, bitmap, fh);
4439         if (status < 0)
4440                 goto xdr_error;
4441 
4442         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4443         if (status < 0)
4444                 goto xdr_error;
4445         fattr->valid |= status;
4446 
4447         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4448         if (status < 0)
4449                 goto xdr_error;
4450         fattr->valid |= status;
4451 
4452         status = decode_attr_mode(xdr, bitmap, &fmode);
4453         if (status < 0)
4454                 goto xdr_error;
4455         if (status != 0) {
4456                 fattr->mode |= fmode;
4457                 fattr->valid |= status;
4458         }
4459 
4460         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4461         if (status < 0)
4462                 goto xdr_error;
4463         fattr->valid |= status;
4464 
4465         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4466         if (status < 0)
4467                 goto xdr_error;
4468         fattr->valid |= status;
4469 
4470         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4471         if (status < 0)
4472                 goto xdr_error;
4473         fattr->valid |= status;
4474 
4475         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4476         if (status < 0)
4477                 goto xdr_error;
4478         fattr->valid |= status;
4479 
4480         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4481         if (status < 0)
4482                 goto xdr_error;
4483         fattr->valid |= status;
4484 
4485         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4486         if (status < 0)
4487                 goto xdr_error;
4488         fattr->valid |= status;
4489 
4490         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4491         if (status < 0)
4492                 goto xdr_error;
4493         fattr->valid |= status;
4494 
4495         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4496         if (status < 0)
4497                 goto xdr_error;
4498         fattr->valid |= status;
4499 
4500         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4501         if (status < 0)
4502                 goto xdr_error;
4503         fattr->valid |= status;
4504 
4505         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4506         if (status < 0)
4507                 goto xdr_error;
4508 
4509 xdr_error:
4510         dprintk("%s: xdr returned %d\n", __func__, -status);
4511         return status;
4512 }
4513 
4514 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4515                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4516                 const struct nfs_server *server)
4517 {
4518         unsigned int savep;
4519         uint32_t attrlen,
4520                  bitmap[3] = {0};
4521         int status;
4522 
4523         status = decode_op_hdr(xdr, OP_GETATTR);
4524         if (status < 0)
4525                 goto xdr_error;
4526 
4527         status = decode_attr_bitmap(xdr, bitmap);
4528         if (status < 0)
4529                 goto xdr_error;
4530 
4531         status = decode_attr_length(xdr, &attrlen, &savep);
4532         if (status < 0)
4533                 goto xdr_error;
4534 
4535         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc, server);
4536         if (status < 0)
4537                 goto xdr_error;
4538 
4539         status = verify_attr_len(xdr, savep, attrlen);
4540 xdr_error:
4541         dprintk("%s: xdr returned %d\n", __func__, -status);
4542         return status;
4543 }
4544 
4545 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4546                 const struct nfs_server *server)
4547 {
4548         return decode_getfattr_generic(xdr, fattr, NULL, NULL, server);
4549 }
4550 
4551 /*
4552  * Decode potentially multiple layout types. Currently we only support
4553  * one layout driver per file system.
4554  */
4555 static int decode_first_pnfs_layout_type(struct xdr_stream *xdr,
4556                                          uint32_t *layouttype)
4557 {
4558         uint32_t *p;
4559         int num;
4560 
4561         p = xdr_inline_decode(xdr, 4);
4562         if (unlikely(!p))
4563                 goto out_overflow;
4564         num = be32_to_cpup(p);
4565 
4566         /* pNFS is not supported by the underlying file system */
4567         if (num == 0) {
4568                 *layouttype = 0;
4569                 return 0;
4570         }
4571         if (num > 1)
4572                 printk(KERN_INFO "NFS: %s: Warning: Multiple pNFS layout "
4573                         "drivers per filesystem not supported\n", __func__);
4574 
4575         /* Decode and set first layout type, move xdr->p past unused types */
4576         p = xdr_inline_decode(xdr, num * 4);
4577         if (unlikely(!p))
4578                 goto out_overflow;
4579         *layouttype = be32_to_cpup(p);
4580         return 0;
4581 out_overflow:
4582         print_overflow_msg(__func__, xdr);
4583         return -EIO;
4584 }
4585 
4586 /*
4587  * The type of file system exported.
4588  * Note we must ensure that layouttype is set in any non-error case.
4589  */
4590 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4591                                 uint32_t *layouttype)
4592 {
4593         int status = 0;
4594 
4595         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4596         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4597                 return -EIO;
4598         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4599                 status = decode_first_pnfs_layout_type(xdr, layouttype);
4600                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4601         } else
4602                 *layouttype = 0;
4603         return status;
4604 }
4605 
4606 /*
4607  * The prefered block size for layout directed io
4608  */
4609 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4610                                       uint32_t *res)
4611 {
4612         __be32 *p;
4613 
4614         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4615         *res = 0;
4616         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4617                 p = xdr_inline_decode(xdr, 4);
4618                 if (unlikely(!p)) {
4619                         print_overflow_msg(__func__, xdr);
4620                         return -EIO;
4621                 }
4622                 *res = be32_to_cpup(p);
4623                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4624         }
4625         return 0;
4626 }
4627 
4628 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4629 {
4630         unsigned int savep;
4631         uint32_t attrlen, bitmap[3];
4632         int status;
4633 
4634         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4635                 goto xdr_error;
4636         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4637                 goto xdr_error;
4638         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4639                 goto xdr_error;
4640 
4641         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4642 
4643         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4644                 goto xdr_error;
4645         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4646                 goto xdr_error;
4647         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4648                 goto xdr_error;
4649         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4650         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4651                 goto xdr_error;
4652         fsinfo->wtpref = fsinfo->wtmax;
4653         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4654         if (status != 0)
4655                 goto xdr_error;
4656         status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
4657         if (status != 0)
4658                 goto xdr_error;
4659         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4660         if (status)
4661                 goto xdr_error;
4662 
4663         status = verify_attr_len(xdr, savep, attrlen);
4664 xdr_error:
4665         dprintk("%s: xdr returned %d!\n", __func__, -status);
4666         return status;
4667 }
4668 
4669 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4670 {
4671         __be32 *p;
4672         uint32_t len;
4673         int status;
4674 
4675         /* Zero handle first to allow comparisons */
4676         memset(fh, 0, sizeof(*fh));
4677 
4678         status = decode_op_hdr(xdr, OP_GETFH);
4679         if (status)
4680                 return status;
4681 
4682         p = xdr_inline_decode(xdr, 4);
4683         if (unlikely(!p))
4684                 goto out_overflow;
4685         len = be32_to_cpup(p);
4686         if (len > NFS4_FHSIZE)
4687                 return -EIO;
4688         fh->size = len;
4689         p = xdr_inline_decode(xdr, len);
4690         if (unlikely(!p))
4691                 goto out_overflow;
4692         memcpy(fh->data, p, len);
4693         return 0;
4694 out_overflow:
4695         print_overflow_msg(__func__, xdr);
4696         return -EIO;
4697 }
4698 
4699 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4700 {
4701         int status;
4702 
4703         status = decode_op_hdr(xdr, OP_LINK);
4704         if (status)
4705                 return status;
4706         return decode_change_info(xdr, cinfo);
4707 }
4708 
4709 /*
4710  * We create the owner, so we know a proper owner.id length is 4.
4711  */
4712 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4713 {
4714         uint64_t offset, length, clientid;
4715         __be32 *p;
4716         uint32_t namelen, type;
4717 
4718         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4719         if (unlikely(!p))
4720                 goto out_overflow;
4721         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4722         p = xdr_decode_hyper(p, &length);
4723         type = be32_to_cpup(p++); /* 4 byte read */
4724         if (fl != NULL) { /* manipulate file lock */
4725                 fl->fl_start = (loff_t)offset;
4726                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4727                 if (length == ~(uint64_t)0)
4728                         fl->fl_end = OFFSET_MAX;
4729                 fl->fl_type = F_WRLCK;
4730                 if (type & 1)
4731                         fl->fl_type = F_RDLCK;
4732                 fl->fl_pid = 0;
4733         }
4734         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4735         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4736         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4737         if (likely(p))
4738                 return -NFS4ERR_DENIED;
4739 out_overflow:
4740         print_overflow_msg(__func__, xdr);
4741         return -EIO;
4742 }
4743 
4744 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4745 {
4746         int status;
4747 
4748         status = decode_op_hdr(xdr, OP_LOCK);
4749         if (status == -EIO)
4750                 goto out;
4751         if (status == 0) {
4752                 status = decode_stateid(xdr, &res->stateid);
4753                 if (unlikely(status))
4754                         goto out;
4755         } else if (status == -NFS4ERR_DENIED)
4756                 status = decode_lock_denied(xdr, NULL);
4757         if (res->open_seqid != NULL)
4758                 nfs_increment_open_seqid(status, res->open_seqid);
4759         nfs_increment_lock_seqid(status, res->lock_seqid);
4760 out:
4761         return status;
4762 }
4763 
4764 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4765 {
4766         int status;
4767         status = decode_op_hdr(xdr, OP_LOCKT);
4768         if (status == -NFS4ERR_DENIED)
4769                 return decode_lock_denied(xdr, res->denied);
4770         return status;
4771 }
4772 
4773 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4774 {
4775         int status;
4776 
4777         status = decode_op_hdr(xdr, OP_LOCKU);
4778         if (status != -EIO)
4779                 nfs_increment_lock_seqid(status, res->seqid);
4780         if (status == 0)
4781                 status = decode_stateid(xdr, &res->stateid);
4782         return status;
4783 }
4784 
4785 static int decode_release_lockowner(struct xdr_stream *xdr)
4786 {
4787         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4788 }
4789 
4790 static int decode_lookup(struct xdr_stream *xdr)
4791 {
4792         return decode_op_hdr(xdr, OP_LOOKUP);
4793 }
4794 
4795 /* This is too sick! */
4796 static int decode_space_limit(struct xdr_stream *xdr, u64 *maxsize)
4797 {
4798         __be32 *p;
4799         uint32_t limit_type, nblocks, blocksize;
4800 
4801         p = xdr_inline_decode(xdr, 12);
4802         if (unlikely(!p))
4803                 goto out_overflow;
4804         limit_type = be32_to_cpup(p++);
4805         switch (limit_type) {
4806         case 1:
4807                 xdr_decode_hyper(p, maxsize);
4808                 break;
4809         case 2:
4810                 nblocks = be32_to_cpup(p++);
4811                 blocksize = be32_to_cpup(p);
4812                 *maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
4813         }
4814         return 0;
4815 out_overflow:
4816         print_overflow_msg(__func__, xdr);
4817         return -EIO;
4818 }
4819 
4820 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
4821 {
4822         __be32 *p;
4823         uint32_t delegation_type;
4824         int status;
4825 
4826         p = xdr_inline_decode(xdr, 4);
4827         if (unlikely(!p))
4828                 goto out_overflow;
4829         delegation_type = be32_to_cpup(p);
4830         if (delegation_type == NFS4_OPEN_DELEGATE_NONE) {
4831                 res->delegation_type = 0;
4832                 return 0;
4833         }
4834         status = decode_stateid(xdr, &res->delegation);
4835         if (unlikely(status))
4836                 return status;
4837         p = xdr_inline_decode(xdr, 4);
4838         if (unlikely(!p))
4839                 goto out_overflow;
4840         res->do_recall = be32_to_cpup(p);
4841 
4842         switch (delegation_type) {
4843         case NFS4_OPEN_DELEGATE_READ:
4844                 res->delegation_type = FMODE_READ;
4845                 break;
4846         case NFS4_OPEN_DELEGATE_WRITE:
4847                 res->delegation_type = FMODE_WRITE|FMODE_READ;
4848                 if (decode_space_limit(xdr, &res->maxsize) < 0)
4849                                 return -EIO;
4850         }
4851         return decode_ace(xdr, NULL, res->server->nfs_client);
4852 out_overflow:
4853         print_overflow_msg(__func__, xdr);
4854         return -EIO;
4855 }
4856 
4857 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
4858 {
4859         __be32 *p;
4860         uint32_t savewords, bmlen, i;
4861         int status;
4862 
4863         status = decode_op_hdr(xdr, OP_OPEN);
4864         if (status != -EIO)
4865                 nfs_increment_open_seqid(status, res->seqid);
4866         if (!status)
4867                 status = decode_stateid(xdr, &res->stateid);
4868         if (unlikely(status))
4869                 return status;
4870 
4871         decode_change_info(xdr, &res->cinfo);
4872 
4873         p = xdr_inline_decode(xdr, 8);
4874         if (unlikely(!p))
4875                 goto out_overflow;
4876         res->rflags = be32_to_cpup(p++);
4877         bmlen = be32_to_cpup(p);
4878         if (bmlen > 10)
4879                 goto xdr_error;
4880 
4881         p = xdr_inline_decode(xdr, bmlen << 2);
4882         if (unlikely(!p))
4883                 goto out_overflow;
4884         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
4885         for (i = 0; i < savewords; ++i)
4886                 res->attrset[i] = be32_to_cpup(p++);
4887         for (; i < NFS4_BITMAP_SIZE; i++)
4888                 res->attrset[i] = 0;
4889 
4890         return decode_delegation(xdr, res);
4891 xdr_error:
4892         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
4893         return -EIO;
4894 out_overflow:
4895         print_overflow_msg(__func__, xdr);
4896         return -EIO;
4897 }
4898 
4899 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
4900 {
4901         int status;
4902 
4903         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
4904         if (status != -EIO)
4905                 nfs_increment_open_seqid(status, res->seqid);
4906         if (!status)
4907                 status = decode_stateid(xdr, &res->stateid);
4908         return status;
4909 }
4910 
4911 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
4912 {
4913         int status;
4914 
4915         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
4916         if (status != -EIO)
4917                 nfs_increment_open_seqid(status, res->seqid);
4918         if (!status)
4919                 status = decode_stateid(xdr, &res->stateid);
4920         return status;
4921 }
4922 
4923 static int decode_putfh(struct xdr_stream *xdr)
4924 {
4925         return decode_op_hdr(xdr, OP_PUTFH);
4926 }
4927 
4928 static int decode_putrootfh(struct xdr_stream *xdr)
4929 {
4930         return decode_op_hdr(xdr, OP_PUTROOTFH);
4931 }
4932 
4933 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_readres *res)
4934 {
4935         __be32 *p;
4936         uint32_t count, eof, recvd;
4937         int status;
4938 
4939         status = decode_op_hdr(xdr, OP_READ);
4940         if (status)
4941                 return status;
4942         p = xdr_inline_decode(xdr, 8);
4943         if (unlikely(!p))
4944                 goto out_overflow;
4945         eof = be32_to_cpup(p++);
4946         count = be32_to_cpup(p);
4947         recvd = xdr_read_pages(xdr, count);
4948         if (count > recvd) {
4949                 dprintk("NFS: server cheating in read reply: "
4950                                 "count %u > recvd %u\n", count, recvd);
4951                 count = recvd;
4952                 eof = 0;
4953         }
4954         res->eof = eof;
4955         res->count = count;
4956         return 0;
4957 out_overflow:
4958         print_overflow_msg(__func__, xdr);
4959         return -EIO;
4960 }
4961 
4962 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
4963 {
4964         int             status;
4965         __be32          verf[2];
4966 
4967         status = decode_op_hdr(xdr, OP_READDIR);
4968         if (!status)
4969                 status = decode_verifier(xdr, readdir->verifier.data);
4970         if (unlikely(status))
4971                 return status;
4972         memcpy(verf, readdir->verifier.data, sizeof(verf));
4973         dprintk("%s: verifier = %08x:%08x\n",
4974                         __func__, verf[0], verf[1]);
4975         return xdr_read_pages(xdr, xdr->buf->page_len);
4976 }
4977 
4978 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
4979 {
4980         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
4981         u32 len, recvd;
4982         __be32 *p;
4983         int status;
4984 
4985         status = decode_op_hdr(xdr, OP_READLINK);
4986         if (status)
4987                 return status;
4988 
4989         /* Convert length of symlink */
4990         p = xdr_inline_decode(xdr, 4);
4991         if (unlikely(!p))
4992                 goto out_overflow;
4993         len = be32_to_cpup(p);
4994         if (len >= rcvbuf->page_len || len <= 0) {
4995                 dprintk("nfs: server returned giant symlink!\n");
4996                 return -ENAMETOOLONG;
4997         }
4998         recvd = xdr_read_pages(xdr, len);
4999         if (recvd < len) {
5000                 dprintk("NFS: server cheating in readlink reply: "
5001                                 "count %u > recvd %u\n", len, recvd);
5002                 return -EIO;
5003         }
5004         /*
5005          * The XDR encode routine has set things up so that
5006          * the link text will be copied directly into the
5007          * buffer.  We just have to do overflow-checking,
5008          * and and null-terminate the text (the VFS expects
5009          * null-termination).
5010          */
5011         xdr_terminate_string(rcvbuf, len);
5012         return 0;
5013 out_overflow:
5014         print_overflow_msg(__func__, xdr);
5015         return -EIO;
5016 }
5017 
5018 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5019 {
5020         int status;
5021 
5022         status = decode_op_hdr(xdr, OP_REMOVE);
5023         if (status)
5024                 goto out;
5025         status = decode_change_info(xdr, cinfo);
5026 out:
5027         return status;
5028 }
5029 
5030 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5031               struct nfs4_change_info *new_cinfo)
5032 {
5033         int status;
5034 
5035         status = decode_op_hdr(xdr, OP_RENAME);
5036         if (status)
5037                 goto out;
5038         if ((status = decode_change_info(xdr, old_cinfo)))
5039                 goto out;
5040         status = decode_change_info(xdr, new_cinfo);
5041 out:
5042         return status;
5043 }
5044 
5045 static int decode_renew(struct xdr_stream *xdr)
5046 {
5047         return decode_op_hdr(xdr, OP_RENEW);
5048 }
5049 
5050 static int
5051 decode_restorefh(struct xdr_stream *xdr)
5052 {
5053         return decode_op_hdr(xdr, OP_RESTOREFH);
5054 }
5055 
5056 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5057                          struct nfs_getaclres *res)
5058 {
5059         unsigned int savep;
5060         uint32_t attrlen,
5061                  bitmap[3] = {0};
5062         int status;
5063         unsigned int pg_offset;
5064 
5065         res->acl_len = 0;
5066         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5067                 goto out;
5068 
5069         xdr_enter_page(xdr, xdr->buf->page_len);
5070 
5071         /* Calculate the offset of the page data */
5072         pg_offset = xdr->buf->head[0].iov_len;
5073 
5074         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5075                 goto out;
5076         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5077                 goto out;
5078 
5079         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5080                 return -EIO;
5081         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5082 
5083                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5084                  * are stored with the acl data to handle the problem of
5085                  * variable length bitmaps.*/
5086                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5087                 res->acl_len = attrlen;
5088 
5089                 /* Check for receive buffer overflow */
5090                 if (res->acl_len > (xdr->nwords << 2) ||
5091                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5092                         res->acl_flags |= NFS4_ACL_TRUNC;
5093                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5094                                         attrlen, xdr->nwords << 2);
5095                 }
5096         } else
5097                 status = -EOPNOTSUPP;
5098 
5099 out:
5100         return status;
5101 }
5102 
5103 static int
5104 decode_savefh(struct xdr_stream *xdr)
5105 {
5106         return decode_op_hdr(xdr, OP_SAVEFH);
5107 }
5108 
5109 static int decode_setattr(struct xdr_stream *xdr)
5110 {
5111         __be32 *p;
5112         uint32_t bmlen;
5113         int status;
5114 
5115         status = decode_op_hdr(xdr, OP_SETATTR);
5116         if (status)
5117                 return status;
5118         p = xdr_inline_decode(xdr, 4);
5119         if (unlikely(!p))
5120                 goto out_overflow;
5121         bmlen = be32_to_cpup(p);
5122         p = xdr_inline_decode(xdr, bmlen << 2);
5123         if (likely(p))
5124                 return 0;
5125 out_overflow:
5126         print_overflow_msg(__func__, xdr);
5127         return -EIO;
5128 }
5129 
5130 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5131 {
5132         __be32 *p;
5133         uint32_t opnum;
5134         int32_t nfserr;
5135 
5136         p = xdr_inline_decode(xdr, 8);
5137         if (unlikely(!p))
5138                 goto out_overflow;
5139         opnum = be32_to_cpup(p++);
5140         if (opnum != OP_SETCLIENTID) {
5141                 dprintk("nfs: decode_setclientid: Server returned operation"
5142                         " %d\n", opnum);
5143                 return -EIO;
5144         }
5145         nfserr = be32_to_cpup(p);
5146         if (nfserr == NFS_OK) {
5147                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5148                 if (unlikely(!p))
5149                         goto out_overflow;
5150                 p = xdr_decode_hyper(p, &res->clientid);
5151                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5152         } else if (nfserr == NFSERR_CLID_INUSE) {
5153                 uint32_t len;
5154 
5155                 /* skip netid string */
5156                 p = xdr_inline_decode(xdr, 4);
5157                 if (unlikely(!p))
5158                         goto out_overflow;
5159                 len = be32_to_cpup(p);
5160                 p = xdr_inline_decode(xdr, len);
5161                 if (unlikely(!p))
5162                         goto out_overflow;
5163 
5164                 /* skip uaddr string */
5165                 p = xdr_inline_decode(xdr, 4);
5166                 if (unlikely(!p))
5167                         goto out_overflow;
5168                 len = be32_to_cpup(p);
5169                 p = xdr_inline_decode(xdr, len);
5170                 if (unlikely(!p))
5171                         goto out_overflow;
5172                 return -NFSERR_CLID_INUSE;
5173         } else
5174                 return nfs4_stat_to_errno(nfserr);
5175 
5176         return 0;
5177 out_overflow:
5178         print_overflow_msg(__func__, xdr);
5179         return -EIO;
5180 }
5181 
5182 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5183 {
5184         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5185 }
5186 
5187 static int decode_write(struct xdr_stream *xdr, struct nfs_writeres *res)
5188 {
5189         __be32 *p;
5190         int status;
5191 
5192         status = decode_op_hdr(xdr, OP_WRITE);
5193         if (status)
5194                 return status;
5195 
5196         p = xdr_inline_decode(xdr, 8);
5197         if (unlikely(!p))
5198                 goto out_overflow;
5199         res->count = be32_to_cpup(p++);
5200         res->verf->committed = be32_to_cpup(p++);
5201         return decode_write_verifier(xdr, &res->verf->verifier);
5202 out_overflow:
5203         print_overflow_msg(__func__, xdr);
5204         return -EIO;
5205 }
5206 
5207 static int decode_delegreturn(struct xdr_stream *xdr)
5208 {
5209         return decode_op_hdr(xdr, OP_DELEGRETURN);
5210 }
5211 
5212 static int decode_secinfo_gss(struct xdr_stream *xdr, struct nfs4_secinfo_flavor *flavor)
5213 {
5214         __be32 *p;
5215 
5216         p = xdr_inline_decode(xdr, 4);
5217         if (unlikely(!p))
5218                 goto out_overflow;
5219         flavor->gss.sec_oid4.len = be32_to_cpup(p);
5220         if (flavor->gss.sec_oid4.len > GSS_OID_MAX_LEN)
5221                 goto out_err;
5222 
5223         p = xdr_inline_decode(xdr, flavor->gss.sec_oid4.len);
5224         if (unlikely(!p))
5225                 goto out_overflow;
5226         memcpy(flavor->gss.sec_oid4.data, p, flavor->gss.sec_oid4.len);
5227 
5228         p = xdr_inline_decode(xdr, 8);
5229         if (unlikely(!p))
5230                 goto out_overflow;
5231         flavor->gss.qop4 = be32_to_cpup(p++);
5232         flavor->gss.service = be32_to_cpup(p);
5233 
5234         return 0;
5235 
5236 out_overflow:
5237         print_overflow_msg(__func__, xdr);
5238         return -EIO;
5239 out_err:
5240         return -EINVAL;
5241 }
5242 
5243 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5244 {
5245         struct nfs4_secinfo_flavor *sec_flavor;
5246         int status;
5247         __be32 *p;
5248         int i, num_flavors;
5249 
5250         p = xdr_inline_decode(xdr, 4);
5251         if (unlikely(!p))
5252                 goto out_overflow;
5253 
5254         res->flavors->num_flavors = 0;
5255         num_flavors = be32_to_cpup(p);
5256 
5257         for (i = 0; i < num_flavors; i++) {
5258                 sec_flavor = &res->flavors->flavors[i];
5259                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5260                         break;
5261 
5262                 p = xdr_inline_decode(xdr, 4);
5263                 if (unlikely(!p))
5264                         goto out_overflow;
5265                 sec_flavor->flavor = be32_to_cpup(p);
5266 
5267                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5268                         status = decode_secinfo_gss(xdr, sec_flavor);
5269                         if (status)
5270                                 goto out;
5271                 }
5272                 res->flavors->num_flavors++;
5273         }
5274 
5275         status = 0;
5276 out:
5277         return status;
5278 out_overflow:
5279         print_overflow_msg(__func__, xdr);
5280         return -EIO;
5281 }
5282 
5283 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5284 {
5285         int status = decode_op_hdr(xdr, OP_SECINFO);
5286         if (status)
5287                 return status;
5288         return decode_secinfo_common(xdr, res);
5289 }
5290 
5291 #if defined(CONFIG_NFS_V4_1)
5292 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5293 {
5294         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5295         if (status)
5296                 return status;
5297         return decode_secinfo_common(xdr, res);
5298 }
5299 
5300 static int decode_exchange_id(struct xdr_stream *xdr,
5301                               struct nfs41_exchange_id_res *res)
5302 {
5303         __be32 *p;
5304         uint32_t dummy;
5305         char *dummy_str;
5306         int status;
5307         uint32_t impl_id_count;
5308 
5309         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5310         if (status)
5311                 return status;
5312 
5313         p = xdr_inline_decode(xdr, 8);
5314         if (unlikely(!p))
5315                 goto out_overflow;
5316         xdr_decode_hyper(p, &res->clientid);
5317         p = xdr_inline_decode(xdr, 12);
5318         if (unlikely(!p))
5319                 goto out_overflow;
5320         res->seqid = be32_to_cpup(p++);
5321         res->flags = be32_to_cpup(p++);
5322 
5323         /* We ask for SP4_NONE */
5324         dummy = be32_to_cpup(p);
5325         if (dummy != SP4_NONE)
5326                 return -EIO;
5327 
5328         /* server_owner4.so_minor_id */
5329         p = xdr_inline_decode(xdr, 8);
5330         if (unlikely(!p))
5331                 goto out_overflow;
5332         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5333 
5334         /* server_owner4.so_major_id */
5335         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5336         if (unlikely(status))
5337                 return status;
5338         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5339                 return -EIO;
5340         memcpy(res->server_owner->major_id, dummy_str, dummy);
5341         res->server_owner->major_id_sz = dummy;
5342 
5343         /* server_scope4 */
5344         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5345         if (unlikely(status))
5346                 return status;
5347         if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5348                 return -EIO;
5349         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5350         res->server_scope->server_scope_sz = dummy;
5351 
5352         /* Implementation Id */
5353         p = xdr_inline_decode(xdr, 4);
5354         if (unlikely(!p))
5355                 goto out_overflow;
5356         impl_id_count = be32_to_cpup(p++);
5357 
5358         if (impl_id_count) {
5359                 /* nii_domain */
5360                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5361                 if (unlikely(status))
5362                         return status;
5363                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5364                         return -EIO;
5365                 memcpy(res->impl_id->domain, dummy_str, dummy);
5366 
5367                 /* nii_name */
5368                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5369                 if (unlikely(status))
5370                         return status;
5371                 if (unlikely(dummy > NFS4_OPAQUE_LIMIT))
5372                         return -EIO;
5373                 memcpy(res->impl_id->name, dummy_str, dummy);
5374 
5375                 /* nii_date */
5376                 p = xdr_inline_decode(xdr, 12);
5377                 if (unlikely(!p))
5378                         goto out_overflow;
5379                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5380                 res->impl_id->date.nseconds = be32_to_cpup(p);
5381 
5382                 /* if there's more than one entry, ignore the rest */
5383         }
5384         return 0;
5385 out_overflow:
5386         print_overflow_msg(__func__, xdr);
5387         return -EIO;
5388 }
5389 
5390 static int decode_chan_attrs(struct xdr_stream *xdr,
5391                              struct nfs4_channel_attrs *attrs)
5392 {
5393         __be32 *p;
5394         u32 nr_attrs, val;
5395 
5396         p = xdr_inline_decode(xdr, 28);
5397         if (unlikely(!p))
5398                 goto out_overflow;
5399         val = be32_to_cpup(p++);        /* headerpadsz */
5400         if (val)
5401                 return -EINVAL;         /* no support for header padding yet */
5402         attrs->max_rqst_sz = be32_to_cpup(p++);
5403         attrs->max_resp_sz = be32_to_cpup(p++);
5404         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5405         attrs->max_ops = be32_to_cpup(p++);
5406         attrs->max_reqs = be32_to_cpup(p++);
5407         nr_attrs = be32_to_cpup(p);
5408         if (unlikely(nr_attrs > 1)) {
5409                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5410                         "count %u\n", __func__, nr_attrs);
5411                 return -EINVAL;
5412         }
5413         if (nr_attrs == 1) {
5414                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5415                 if (unlikely(!p))
5416                         goto out_overflow;
5417         }
5418         return 0;
5419 out_overflow:
5420         print_overflow_msg(__func__, xdr);
5421         return -EIO;
5422 }
5423 
5424 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5425 {
5426         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5427 }
5428 
5429 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5430                                 struct nfs41_bind_conn_to_session_res *res)
5431 {
5432         __be32 *p;
5433         int status;
5434 
5435         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5436         if (!status)
5437                 status = decode_sessionid(xdr, &res->session->sess_id);
5438         if (unlikely(status))
5439                 return status;
5440 
5441         /* dir flags, rdma mode bool */
5442         p = xdr_inline_decode(xdr, 8);
5443         if (unlikely(!p))
5444                 goto out_overflow;
5445 
5446         res->dir = be32_to_cpup(p++);
5447         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5448                 return -EIO;
5449         if (be32_to_cpup(p) == 0)
5450                 res->use_conn_in_rdma_mode = false;
5451         else
5452                 res->use_conn_in_rdma_mode = true;
5453 
5454         return 0;
5455 out_overflow:
5456         print_overflow_msg(__func__, xdr);
5457         return -EIO;
5458 }
5459 
5460 static int decode_create_session(struct xdr_stream *xdr,
5461                                  struct nfs41_create_session_res *res)
5462 {
5463         __be32 *p;
5464         int status;
5465         struct nfs_client *clp = res->client;
5466         struct nfs4_session *session = clp->cl_session;
5467 
5468         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5469         if (!status)
5470                 status = decode_sessionid(xdr, &session->sess_id);
5471         if (unlikely(status))
5472                 return status;
5473 
5474         /* seqid, flags */
5475         p = xdr_inline_decode(xdr, 8);
5476         if (unlikely(!p))
5477                 goto out_overflow;
5478         clp->cl_seqid = be32_to_cpup(p++);
5479         session->flags = be32_to_cpup(p);
5480 
5481         /* Channel attributes */
5482         status = decode_chan_attrs(xdr, &session->fc_attrs);
5483         if (!status)
5484                 status = decode_chan_attrs(xdr, &session->bc_attrs);
5485         return status;
5486 out_overflow:
5487         print_overflow_msg(__func__, xdr);
5488         return -EIO;
5489 }
5490 
5491 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5492 {
5493         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5494 }
5495 
5496 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5497 {
5498         return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5499 }
5500 
5501 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5502 {
5503         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5504 }
5505 #endif /* CONFIG_NFS_V4_1 */
5506 
5507 static int decode_sequence(struct xdr_stream *xdr,
5508                            struct nfs4_sequence_res *res,
5509                            struct rpc_rqst *rqstp)
5510 {
5511 #if defined(CONFIG_NFS_V4_1)
5512         struct nfs4_sessionid id;
5513         u32 dummy;
5514         int status;
5515         __be32 *p;
5516 
5517         if (!res->sr_session)
5518                 return 0;
5519 
5520         status = decode_op_hdr(xdr, OP_SEQUENCE);
5521         if (!status)
5522                 status = decode_sessionid(xdr, &id);
5523         if (unlikely(status))
5524                 goto out_err;
5525 
5526         /*
5527          * If the server returns different values for sessionID, slotID or
5528          * sequence number, the server is looney tunes.
5529          */
5530         status = -EREMOTEIO;
5531 
5532         if (memcmp(id.data, res->sr_session->sess_id.data,
5533                    NFS4_MAX_SESSIONID_LEN)) {
5534                 dprintk("%s Invalid session id\n", __func__);
5535                 goto out_err;
5536         }
5537 
5538         p = xdr_inline_decode(xdr, 20);
5539         if (unlikely(!p))
5540                 goto out_overflow;
5541 
5542         /* seqid */
5543         dummy = be32_to_cpup(p++);
5544         if (dummy != res->sr_slot->seq_nr) {
5545                 dprintk("%s Invalid sequence number\n", __func__);
5546                 goto out_err;
5547         }
5548         /* slot id */
5549         dummy = be32_to_cpup(p++);
5550         if (dummy != res->sr_slot - res->sr_session->fc_slot_table.slots) {
5551                 dprintk("%s Invalid slot id\n", __func__);
5552                 goto out_err;
5553         }
5554         /* highest slot id - currently not processed */
5555         dummy = be32_to_cpup(p++);
5556         /* target highest slot id - currently not processed */
5557         dummy = be32_to_cpup(p++);
5558         /* result flags */
5559         res->sr_status_flags = be32_to_cpup(p);
5560         status = 0;
5561 out_err:
5562         res->sr_status = status;
5563         return status;
5564 out_overflow:
5565         print_overflow_msg(__func__, xdr);
5566         status = -EIO;
5567         goto out_err;
5568 #else  /* CONFIG_NFS_V4_1 */
5569         return 0;
5570 #endif /* CONFIG_NFS_V4_1 */
5571 }
5572 
5573 #if defined(CONFIG_NFS_V4_1)
5574 /*
5575  * TODO: Need to handle case when EOF != true;
5576  */
5577 static int decode_getdevicelist(struct xdr_stream *xdr,
5578                                 struct pnfs_devicelist *res)
5579 {
5580         __be32 *p;
5581         int status, i;
5582         nfs4_verifier verftemp;
5583 
5584         status = decode_op_hdr(xdr, OP_GETDEVICELIST);
5585         if (status)
5586                 return status;
5587 
5588         p = xdr_inline_decode(xdr, 8 + 8 + 4);
5589         if (unlikely(!p))
5590                 goto out_overflow;
5591 
5592         /* TODO: Skip cookie for now */
5593         p += 2;
5594 
5595         /* Read verifier */
5596         p = xdr_decode_opaque_fixed(p, verftemp.data, NFS4_VERIFIER_SIZE);
5597 
5598         res->num_devs = be32_to_cpup(p);
5599 
5600