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

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  1 /*
  2  *  fs/nfs/nfs4xdr.c
  3  *
  4  *  Client-side XDR for NFSv4.
  5  *
  6  *  Copyright (c) 2002 The Regents of the University of Michigan.
  7  *  All rights reserved.
  8  *
  9  *  Kendrick Smith <kmsmith@umich.edu>
 10  *  Andy Adamson   <andros@umich.edu>
 11  *
 12  *  Redistribution and use in source and binary forms, with or without
 13  *  modification, are permitted provided that the following conditions
 14  *  are met:
 15  *
 16  *  1. Redistributions of source code must retain the above copyright
 17  *     notice, this list of conditions and the following disclaimer.
 18  *  2. Redistributions in binary form must reproduce the above copyright
 19  *     notice, this list of conditions and the following disclaimer in the
 20  *     documentation and/or other materials provided with the distribution.
 21  *  3. Neither the name of the University nor the names of its
 22  *     contributors may be used to endorse or promote products derived
 23  *     from this software without specific prior written permission.
 24  *
 25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 36  */
 37 
 38 #include <linux/param.h>
 39 #include <linux/time.h>
 40 #include <linux/mm.h>
 41 #include <linux/errno.h>
 42 #include <linux/string.h>
 43 #include <linux/in.h>
 44 #include <linux/pagemap.h>
 45 #include <linux/proc_fs.h>
 46 #include <linux/kdev_t.h>
 47 #include <linux/module.h>
 48 #include <linux/utsname.h>
 49 #include <linux/sunrpc/clnt.h>
 50 #include <linux/sunrpc/msg_prot.h>
 51 #include <linux/sunrpc/gss_api.h>
 52 #include <linux/nfs.h>
 53 #include <linux/nfs4.h>
 54 #include <linux/nfs_fs.h>
 55 
 56 #include "nfs4_fs.h"
 57 #include "nfs4trace.h"
 58 #include "internal.h"
 59 #include "nfs4idmap.h"
 60 #include "nfs4session.h"
 61 #include "pnfs.h"
 62 #include "netns.h"
 63 
 64 #define NFSDBG_FACILITY         NFSDBG_XDR
 65 
 66 /* Mapping from NFS error code to "errno" error code. */
 67 #define errno_NFSERR_IO         EIO
 68 
 69 struct compound_hdr;
 70 static int nfs4_stat_to_errno(int);
 71 static void encode_layoutget(struct xdr_stream *xdr,
 72                              const struct nfs4_layoutget_args *args,
 73                              struct compound_hdr *hdr);
 74 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
 75                              struct nfs4_layoutget_res *res);
 76 
 77 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
 78 #ifdef DEBUG
 79 #define NFS4_MAXTAGLEN          20
 80 #else
 81 #define NFS4_MAXTAGLEN          0
 82 #endif
 83 
 84 /* lock,open owner id:
 85  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
 86  */
 87 #define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
 88 #define lock_owner_id_maxsz     (1 + 1 + 4)
 89 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 90 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 91 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 92 #define op_encode_hdr_maxsz     (1)
 93 #define op_decode_hdr_maxsz     (2)
 94 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 95 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 96 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 97 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 98 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
 99                                 (NFS4_FHSIZE >> 2))
100 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
101 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
102 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
103 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
104 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
105                                 ((3+NFS4_FHSIZE) >> 2))
106 #define nfs4_fattr_bitmap_maxsz 4
107 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
108 #define nfstime4_maxsz          (3)
109 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
110 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
111 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
112 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
113 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
114 /* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
115 #define nfs4_label_maxsz        (4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
116 #else
117 #define nfs4_label_maxsz        0
118 #endif
119 /* We support only one layout type per file system */
120 #define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
121 /* This is based on getfattr, which uses the most attributes: */
122 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
123                                 3*nfstime4_maxsz + \
124                                 nfs4_owner_maxsz + \
125                                 nfs4_group_maxsz + nfs4_label_maxsz + \
126                                  decode_mdsthreshold_maxsz))
127 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
128                                 nfs4_fattr_value_maxsz)
129 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
130 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
131                                  1 + 2 + 1 + \
132                                 nfs4_owner_maxsz + \
133                                 nfs4_group_maxsz + \
134                                 nfs4_label_maxsz + \
135                                 1 + nfstime4_maxsz + \
136                                 1 + nfstime4_maxsz)
137 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
138 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
139 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
140 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
141 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
142 /* The 5 accounts for the PNFS attributes, and assumes that at most three
143  * layout types will be returned.
144  */
145 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
146                                  nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
147 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
148 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
149 #define encode_setclientid_maxsz \
150                                 (op_encode_hdr_maxsz + \
151                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
152                                 /* client name */ \
153                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
154                                 1 /* sc_prog */ + \
155                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
156                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
157                                 1) /* sc_cb_ident */
158 #define decode_setclientid_maxsz \
159                                 (op_decode_hdr_maxsz + \
160                                 2 /* clientid */ + \
161                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
162                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
163                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
164 #define encode_setclientid_confirm_maxsz \
165                                 (op_encode_hdr_maxsz + \
166                                 3 + (NFS4_VERIFIER_SIZE >> 2))
167 #define decode_setclientid_confirm_maxsz \
168                                 (op_decode_hdr_maxsz)
169 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
170 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
171 #define encode_lookupp_maxsz    (op_encode_hdr_maxsz)
172 #define decode_lookupp_maxsz    (op_decode_hdr_maxsz)
173 #define encode_share_access_maxsz \
174                                 (2)
175 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
176 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
177 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
178 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
179                                 2 + encode_share_access_maxsz + 2 + \
180                                 open_owner_id_maxsz + \
181                                 encode_opentype_maxsz + \
182                                 encode_claim_null_maxsz)
183 #define decode_space_limit_maxsz        (3)
184 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
185 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
186                                 decode_space_limit_maxsz + \
187                                 decode_ace_maxsz)
188 #define decode_change_info_maxsz        (5)
189 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
190                                 decode_stateid_maxsz + \
191                                 decode_change_info_maxsz + 1 + \
192                                 nfs4_fattr_bitmap_maxsz + \
193                                 decode_delegation_maxsz)
194 #define encode_open_confirm_maxsz \
195                                 (op_encode_hdr_maxsz + \
196                                  encode_stateid_maxsz + 1)
197 #define decode_open_confirm_maxsz \
198                                 (op_decode_hdr_maxsz + \
199                                  decode_stateid_maxsz)
200 #define encode_open_downgrade_maxsz \
201                                 (op_encode_hdr_maxsz + \
202                                  encode_stateid_maxsz + 1 + \
203                                  encode_share_access_maxsz)
204 #define decode_open_downgrade_maxsz \
205                                 (op_decode_hdr_maxsz + \
206                                  decode_stateid_maxsz)
207 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
208                                  1 + encode_stateid_maxsz)
209 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
210                                  decode_stateid_maxsz)
211 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
212                                  encode_stateid_maxsz + \
213                                  encode_attrs_maxsz)
214 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
215                                  nfs4_fattr_bitmap_maxsz)
216 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
217                                  encode_stateid_maxsz + 3)
218 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2 + 1)
219 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
220                                  2 + encode_verifier_maxsz + 5 + \
221                                 nfs4_label_maxsz)
222 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
223                                  decode_verifier_maxsz + 1)
224 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
225 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1 + 1)
226 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
227                                  encode_stateid_maxsz + 4)
228 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
229                                  2 + decode_verifier_maxsz)
230 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
231 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
232                                  decode_verifier_maxsz)
233 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
234                                 nfs4_name_maxsz)
235 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
236                                  decode_change_info_maxsz)
237 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
238                                 2 * nfs4_name_maxsz)
239 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
240                                  decode_change_info_maxsz + \
241                                  decode_change_info_maxsz)
242 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
243                                 nfs4_name_maxsz)
244 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
245 #define encode_lockowner_maxsz  (7)
246 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
247                                  7 + \
248                                  1 + encode_stateid_maxsz + 1 + \
249                                  encode_lockowner_maxsz)
250 #define decode_lock_denied_maxsz \
251                                 (8 + decode_lockowner_maxsz)
252 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
253                                  decode_lock_denied_maxsz)
254 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
255                                 encode_lockowner_maxsz)
256 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
257                                  decode_lock_denied_maxsz)
258 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
259                                  encode_stateid_maxsz + \
260                                  4)
261 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
262                                  decode_stateid_maxsz)
263 #define encode_release_lockowner_maxsz \
264                                 (op_encode_hdr_maxsz + \
265                                  encode_lockowner_maxsz)
266 #define decode_release_lockowner_maxsz \
267                                 (op_decode_hdr_maxsz)
268 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
269 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
270 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
271                                 1 + nfs4_name_maxsz + \
272                                 1 + \
273                                 nfs4_fattr_maxsz)
274 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
275 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
276                                 1 + 2 + nfs4_name_maxsz + \
277                                 encode_attrs_maxsz)
278 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
279                                 decode_change_info_maxsz + \
280                                 nfs4_fattr_bitmap_maxsz)
281 #define encode_statfs_maxsz     (encode_getattr_maxsz)
282 #define decode_statfs_maxsz     (decode_getattr_maxsz)
283 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
284 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
285 #define encode_getacl_maxsz     (encode_getattr_maxsz)
286 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
287                                  nfs4_fattr_bitmap_maxsz + 1 + 1)
288 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
289                                  encode_stateid_maxsz + 3)
290 #define decode_setacl_maxsz     (decode_setattr_maxsz)
291 #define encode_fs_locations_maxsz \
292                                 (encode_getattr_maxsz)
293 #define decode_fs_locations_maxsz \
294                                 (1)
295 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
296 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
297 
298 #if defined(CONFIG_NFS_V4_1)
299 #define NFS4_MAX_MACHINE_NAME_LEN (64)
300 #define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
301                          sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
302 
303 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
304                                 encode_verifier_maxsz + \
305                                 1 /* co_ownerid.len */ + \
306                                 /* eia_clientowner */ \
307                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
308                                 1 /* flags */ + \
309                                 1 /* spa_how */ + \
310                                 /* max is SP4_MACH_CRED (for now) */ + \
311                                 1 + NFS4_OP_MAP_NUM_WORDS + \
312                                 1 + NFS4_OP_MAP_NUM_WORDS + \
313                                 1 /* implementation id array of size 1 */ + \
314                                 1 /* nii_domain */ + \
315                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
316                                 1 /* nii_name */ + \
317                                 XDR_QUADLEN(IMPL_NAME_LIMIT) + \
318                                 3 /* nii_date */)
319 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
320                                 2 /* eir_clientid */ + \
321                                 1 /* eir_sequenceid */ + \
322                                 1 /* eir_flags */ + \
323                                 1 /* spr_how */ + \
324                                   /* max is SP4_MACH_CRED (for now) */ + \
325                                 1 + NFS4_OP_MAP_NUM_WORDS + \
326                                 1 + NFS4_OP_MAP_NUM_WORDS + \
327                                 2 /* eir_server_owner.so_minor_id */ + \
328                                 /* eir_server_owner.so_major_id<> */ \
329                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
330                                 /* eir_server_scope<> */ \
331                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
332                                 1 /* eir_server_impl_id array length */ + \
333                                 1 /* nii_domain */ + \
334                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
335                                 1 /* nii_name */ + \
336                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
337                                 3 /* nii_date */)
338 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
339 #define decode_channel_attrs_maxsz  (6 + \
340                                      1 /* ca_rdma_ird.len */ + \
341                                      1 /* ca_rdma_ird */)
342 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
343                                      2 /* csa_clientid */ + \
344                                      1 /* csa_sequence */ + \
345                                      1 /* csa_flags */ + \
346                                      encode_channel_attrs_maxsz + \
347                                      encode_channel_attrs_maxsz + \
348                                      1 /* csa_cb_program */ + \
349                                      1 /* csa_sec_parms.len (1) */ + \
350                                      1 /* cb_secflavor (AUTH_SYS) */ + \
351                                      1 /* stamp */ + \
352                                      1 /* machinename.len */ + \
353                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
354                                      1 /* uid */ + \
355                                      1 /* gid */ + \
356                                      1 /* gids.len (0) */)
357 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
358                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
359                                      1 /* csr_sequence */ + \
360                                      1 /* csr_flags */ + \
361                                      decode_channel_attrs_maxsz + \
362                                      decode_channel_attrs_maxsz)
363 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
364                                      /* bctsa_sessid */ \
365                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
366                                      1 /* bctsa_dir */ + \
367                                      1 /* bctsa_use_conn_in_rdma_mode */)
368 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
369                                      /* bctsr_sessid */ \
370                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
371                                      1 /* bctsr_dir */ + \
372                                      1 /* bctsr_use_conn_in_rdma_mode */)
373 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
374 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
375 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
376 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
377 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
378                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
379 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
380                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
381 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
382 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
383 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
384                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
385                                 1 /* layout type */ + \
386                                 1 /* maxcount */ + \
387                                 1 /* bitmap size */ + \
388                                 1 /* notification bitmap length */ + \
389                                 1 /* notification bitmap, word 0 */)
390 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
391                                 1 /* layout type */ + \
392                                 1 /* opaque devaddr4 length */ + \
393                                   /* devaddr4 payload is read into page */ \
394                                 1 /* notification bitmap length */ + \
395                                 1 /* notification bitmap, word 0 */ + \
396                                 1 /* possible XDR padding */)
397 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
398                                 encode_stateid_maxsz)
399 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
400                                 decode_stateid_maxsz + \
401                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE) + 1)
402 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
403                                 2 /* offset */ + \
404                                 2 /* length */ + \
405                                 1 /* reclaim */ + \
406                                 encode_stateid_maxsz + \
407                                 1 /* new offset (true) */ + \
408                                 2 /* last byte written */ + \
409                                 1 /* nt_timechanged (false) */ + \
410                                 1 /* layoutupdate4 layout type */ + \
411                                 1 /* layoutupdate4 opaqueue len */)
412                                   /* the actual content of layoutupdate4 should
413                                      be allocated by drivers and spliced in
414                                      using xdr_write_pages */
415 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
416 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
417                                 encode_stateid_maxsz + \
418                                 1 + \
419                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
420 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
421                                 1 + decode_stateid_maxsz)
422 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
423 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
424 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
425                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
426 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
427 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
428                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
429 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz)
430 #else /* CONFIG_NFS_V4_1 */
431 #define encode_sequence_maxsz   0
432 #define decode_sequence_maxsz   0
433 #define encode_layoutreturn_maxsz 0
434 #define decode_layoutreturn_maxsz 0
435 #define encode_layoutget_maxsz  0
436 #define decode_layoutget_maxsz  0
437 #endif /* CONFIG_NFS_V4_1 */
438 
439 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
440 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
441 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
442                                 encode_sequence_maxsz + \
443                                 encode_putfh_maxsz + \
444                                 encode_read_maxsz)
445 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
446                                 decode_sequence_maxsz + \
447                                 decode_putfh_maxsz + \
448                                 decode_read_maxsz)
449 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
450                                 encode_sequence_maxsz + \
451                                 encode_putfh_maxsz + \
452                                 encode_readlink_maxsz)
453 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
454                                 decode_sequence_maxsz + \
455                                 decode_putfh_maxsz + \
456                                 decode_readlink_maxsz)
457 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
458                                 encode_sequence_maxsz + \
459                                 encode_putfh_maxsz + \
460                                 encode_readdir_maxsz)
461 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
462                                 decode_sequence_maxsz + \
463                                 decode_putfh_maxsz + \
464                                 decode_readdir_maxsz)
465 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
466                                 encode_sequence_maxsz + \
467                                 encode_putfh_maxsz + \
468                                 encode_write_maxsz + \
469                                 encode_getattr_maxsz)
470 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
471                                 decode_sequence_maxsz + \
472                                 decode_putfh_maxsz + \
473                                 decode_write_maxsz + \
474                                 decode_getattr_maxsz)
475 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
476                                 encode_sequence_maxsz + \
477                                 encode_putfh_maxsz + \
478                                 encode_commit_maxsz)
479 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
480                                 decode_sequence_maxsz + \
481                                 decode_putfh_maxsz + \
482                                 decode_commit_maxsz)
483 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
484                                 encode_sequence_maxsz + \
485                                 encode_putfh_maxsz + \
486                                 encode_open_maxsz + \
487                                 encode_access_maxsz + \
488                                 encode_getfh_maxsz + \
489                                 encode_getattr_maxsz + \
490                                 encode_layoutget_maxsz)
491 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
492                                 decode_sequence_maxsz + \
493                                 decode_putfh_maxsz + \
494                                 decode_open_maxsz + \
495                                 decode_access_maxsz + \
496                                 decode_getfh_maxsz + \
497                                 decode_getattr_maxsz + \
498                                 decode_layoutget_maxsz)
499 #define NFS4_enc_open_confirm_sz \
500                                 (compound_encode_hdr_maxsz + \
501                                  encode_putfh_maxsz + \
502                                  encode_open_confirm_maxsz)
503 #define NFS4_dec_open_confirm_sz \
504                                 (compound_decode_hdr_maxsz + \
505                                  decode_putfh_maxsz + \
506                                  decode_open_confirm_maxsz)
507 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
508                                         encode_sequence_maxsz + \
509                                         encode_putfh_maxsz + \
510                                         encode_open_maxsz + \
511                                         encode_access_maxsz + \
512                                         encode_getattr_maxsz + \
513                                         encode_layoutget_maxsz)
514 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
515                                         decode_sequence_maxsz + \
516                                         decode_putfh_maxsz + \
517                                         decode_open_maxsz + \
518                                         decode_access_maxsz + \
519                                         decode_getattr_maxsz + \
520                                         decode_layoutget_maxsz)
521 #define NFS4_enc_open_downgrade_sz \
522                                 (compound_encode_hdr_maxsz + \
523                                  encode_sequence_maxsz + \
524                                  encode_putfh_maxsz + \
525                                  encode_layoutreturn_maxsz + \
526                                  encode_open_downgrade_maxsz)
527 #define NFS4_dec_open_downgrade_sz \
528                                 (compound_decode_hdr_maxsz + \
529                                  decode_sequence_maxsz + \
530                                  decode_putfh_maxsz + \
531                                  decode_layoutreturn_maxsz + \
532                                  decode_open_downgrade_maxsz)
533 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
534                                  encode_sequence_maxsz + \
535                                  encode_putfh_maxsz + \
536                                  encode_layoutreturn_maxsz + \
537                                  encode_close_maxsz + \
538                                  encode_getattr_maxsz)
539 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
540                                  decode_sequence_maxsz + \
541                                  decode_putfh_maxsz + \
542                                  decode_layoutreturn_maxsz + \
543                                  decode_close_maxsz + \
544                                  decode_getattr_maxsz)
545 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
546                                  encode_sequence_maxsz + \
547                                  encode_putfh_maxsz + \
548                                  encode_setattr_maxsz + \
549                                  encode_getattr_maxsz)
550 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
551                                  decode_sequence_maxsz + \
552                                  decode_putfh_maxsz + \
553                                  decode_setattr_maxsz + \
554                                  decode_getattr_maxsz)
555 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
556                                 encode_sequence_maxsz + \
557                                 encode_putfh_maxsz + \
558                                 encode_fsinfo_maxsz)
559 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
560                                 decode_sequence_maxsz + \
561                                 decode_putfh_maxsz + \
562                                 decode_fsinfo_maxsz)
563 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
564                                 encode_renew_maxsz)
565 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
566                                 decode_renew_maxsz)
567 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
568                                 encode_setclientid_maxsz)
569 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
570                                 decode_setclientid_maxsz)
571 #define NFS4_enc_setclientid_confirm_sz \
572                                 (compound_encode_hdr_maxsz + \
573                                 encode_setclientid_confirm_maxsz)
574 #define NFS4_dec_setclientid_confirm_sz \
575                                 (compound_decode_hdr_maxsz + \
576                                 decode_setclientid_confirm_maxsz)
577 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
578                                 encode_sequence_maxsz + \
579                                 encode_putfh_maxsz + \
580                                 encode_lock_maxsz)
581 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
582                                 decode_sequence_maxsz + \
583                                 decode_putfh_maxsz + \
584                                 decode_lock_maxsz)
585 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
586                                 encode_sequence_maxsz + \
587                                 encode_putfh_maxsz + \
588                                 encode_lockt_maxsz)
589 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
590                                  decode_sequence_maxsz + \
591                                  decode_putfh_maxsz + \
592                                  decode_lockt_maxsz)
593 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
594                                 encode_sequence_maxsz + \
595                                 encode_putfh_maxsz + \
596                                 encode_locku_maxsz)
597 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
598                                 decode_sequence_maxsz + \
599                                 decode_putfh_maxsz + \
600                                 decode_locku_maxsz)
601 #define NFS4_enc_release_lockowner_sz \
602                                 (compound_encode_hdr_maxsz + \
603                                  encode_lockowner_maxsz)
604 #define NFS4_dec_release_lockowner_sz \
605                                 (compound_decode_hdr_maxsz + \
606                                  decode_lockowner_maxsz)
607 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
608                                 encode_sequence_maxsz + \
609                                 encode_putfh_maxsz + \
610                                 encode_access_maxsz + \
611                                 encode_getattr_maxsz)
612 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
613                                 decode_sequence_maxsz + \
614                                 decode_putfh_maxsz + \
615                                 decode_access_maxsz + \
616                                 decode_getattr_maxsz)
617 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
618                                 encode_sequence_maxsz + \
619                                 encode_putfh_maxsz + \
620                                 encode_getattr_maxsz + \
621                                 encode_renew_maxsz)
622 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
623                                 decode_sequence_maxsz + \
624                                 decode_putfh_maxsz + \
625                                 decode_getattr_maxsz + \
626                                 decode_renew_maxsz)
627 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
628                                 encode_sequence_maxsz + \
629                                 encode_putfh_maxsz + \
630                                 encode_lookup_maxsz + \
631                                 encode_getattr_maxsz + \
632                                 encode_getfh_maxsz)
633 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
634                                 decode_sequence_maxsz + \
635                                 decode_putfh_maxsz + \
636                                 decode_lookup_maxsz + \
637                                 decode_getattr_maxsz + \
638                                 decode_getfh_maxsz)
639 #define NFS4_enc_lookupp_sz     (compound_encode_hdr_maxsz + \
640                                 encode_sequence_maxsz + \
641                                 encode_putfh_maxsz + \
642                                 encode_lookupp_maxsz + \
643                                 encode_getattr_maxsz + \
644                                 encode_getfh_maxsz)
645 #define NFS4_dec_lookupp_sz     (compound_decode_hdr_maxsz + \
646                                 decode_sequence_maxsz + \
647                                 decode_putfh_maxsz + \
648                                 decode_lookupp_maxsz + \
649                                 decode_getattr_maxsz + \
650                                 decode_getfh_maxsz)
651 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
652                                 encode_sequence_maxsz + \
653                                 encode_putrootfh_maxsz + \
654                                 encode_getattr_maxsz + \
655                                 encode_getfh_maxsz)
656 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
657                                 decode_sequence_maxsz + \
658                                 decode_putrootfh_maxsz + \
659                                 decode_getattr_maxsz + \
660                                 decode_getfh_maxsz)
661 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
662                                 encode_sequence_maxsz + \
663                                 encode_putfh_maxsz + \
664                                 encode_remove_maxsz)
665 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
666                                 decode_sequence_maxsz + \
667                                 decode_putfh_maxsz + \
668                                 decode_remove_maxsz)
669 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
670                                 encode_sequence_maxsz + \
671                                 encode_putfh_maxsz + \
672                                 encode_savefh_maxsz + \
673                                 encode_putfh_maxsz + \
674                                 encode_rename_maxsz)
675 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
676                                 decode_sequence_maxsz + \
677                                 decode_putfh_maxsz + \
678                                 decode_savefh_maxsz + \
679                                 decode_putfh_maxsz + \
680                                 decode_rename_maxsz)
681 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
682                                 encode_sequence_maxsz + \
683                                 encode_putfh_maxsz + \
684                                 encode_savefh_maxsz + \
685                                 encode_putfh_maxsz + \
686                                 encode_link_maxsz + \
687                                 encode_restorefh_maxsz + \
688                                 encode_getattr_maxsz)
689 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
690                                 decode_sequence_maxsz + \
691                                 decode_putfh_maxsz + \
692                                 decode_savefh_maxsz + \
693                                 decode_putfh_maxsz + \
694                                 decode_link_maxsz + \
695                                 decode_restorefh_maxsz + \
696                                 decode_getattr_maxsz)
697 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
698                                 encode_sequence_maxsz + \
699                                 encode_putfh_maxsz + \
700                                 encode_symlink_maxsz + \
701                                 encode_getattr_maxsz + \
702                                 encode_getfh_maxsz)
703 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
704                                 decode_sequence_maxsz + \
705                                 decode_putfh_maxsz + \
706                                 decode_symlink_maxsz + \
707                                 decode_getattr_maxsz + \
708                                 decode_getfh_maxsz)
709 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
710                                 encode_sequence_maxsz + \
711                                 encode_putfh_maxsz + \
712                                 encode_create_maxsz + \
713                                 encode_getfh_maxsz + \
714                                 encode_getattr_maxsz)
715 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
716                                 decode_sequence_maxsz + \
717                                 decode_putfh_maxsz + \
718                                 decode_create_maxsz + \
719                                 decode_getfh_maxsz + \
720                                 decode_getattr_maxsz)
721 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
722                                 encode_sequence_maxsz + \
723                                 encode_putfh_maxsz + \
724                                 encode_getattr_maxsz)
725 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
726                                 decode_sequence_maxsz + \
727                                 decode_putfh_maxsz + \
728                                 decode_getattr_maxsz)
729 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
730                                 encode_sequence_maxsz + \
731                                 encode_putfh_maxsz + \
732                                 encode_statfs_maxsz)
733 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
734                                 decode_sequence_maxsz + \
735                                 decode_putfh_maxsz + \
736                                 decode_statfs_maxsz)
737 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
738                                 encode_sequence_maxsz + \
739                                 encode_putfh_maxsz + \
740                                 encode_getattr_maxsz)
741 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
742                                 decode_sequence_maxsz + \
743                                 decode_putfh_maxsz + \
744                                 decode_getattr_maxsz)
745 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
746                                 encode_sequence_maxsz + \
747                                 encode_putfh_maxsz + \
748                                 encode_layoutreturn_maxsz + \
749                                 encode_delegreturn_maxsz + \
750                                 encode_getattr_maxsz)
751 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
752                                 decode_sequence_maxsz + \
753                                 decode_putfh_maxsz + \
754                                 decode_layoutreturn_maxsz + \
755                                 decode_delegreturn_maxsz + \
756                                 decode_getattr_maxsz)
757 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
758                                 encode_sequence_maxsz + \
759                                 encode_putfh_maxsz + \
760                                 encode_getacl_maxsz)
761 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
762                                 decode_sequence_maxsz + \
763                                 decode_putfh_maxsz + \
764                                 decode_getacl_maxsz)
765 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
766                                 encode_sequence_maxsz + \
767                                 encode_putfh_maxsz + \
768                                 encode_setacl_maxsz)
769 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
770                                 decode_sequence_maxsz + \
771                                 decode_putfh_maxsz + \
772                                 decode_setacl_maxsz)
773 #define NFS4_enc_fs_locations_sz \
774                                 (compound_encode_hdr_maxsz + \
775                                  encode_sequence_maxsz + \
776                                  encode_putfh_maxsz + \
777                                  encode_lookup_maxsz + \
778                                  encode_fs_locations_maxsz + \
779                                  encode_renew_maxsz)
780 #define NFS4_dec_fs_locations_sz \
781                                 (compound_decode_hdr_maxsz + \
782                                  decode_sequence_maxsz + \
783                                  decode_putfh_maxsz + \
784                                  decode_lookup_maxsz + \
785                                  decode_fs_locations_maxsz + \
786                                  decode_renew_maxsz)
787 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
788                                 encode_sequence_maxsz + \
789                                 encode_putfh_maxsz + \
790                                 encode_secinfo_maxsz)
791 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
792                                 decode_sequence_maxsz + \
793                                 decode_putfh_maxsz + \
794                                 decode_secinfo_maxsz)
795 #define NFS4_enc_fsid_present_sz \
796                                 (compound_encode_hdr_maxsz + \
797                                  encode_sequence_maxsz + \
798                                  encode_putfh_maxsz + \
799                                  encode_getfh_maxsz + \
800                                  encode_renew_maxsz)
801 #define NFS4_dec_fsid_present_sz \
802                                 (compound_decode_hdr_maxsz + \
803                                  decode_sequence_maxsz + \
804                                  decode_putfh_maxsz + \
805                                  decode_getfh_maxsz + \
806                                  decode_renew_maxsz)
807 #if defined(CONFIG_NFS_V4_1)
808 #define NFS4_enc_bind_conn_to_session_sz \
809                                 (compound_encode_hdr_maxsz + \
810                                  encode_bind_conn_to_session_maxsz)
811 #define NFS4_dec_bind_conn_to_session_sz \
812                                 (compound_decode_hdr_maxsz + \
813                                  decode_bind_conn_to_session_maxsz)
814 #define NFS4_enc_exchange_id_sz \
815                                 (compound_encode_hdr_maxsz + \
816                                  encode_exchange_id_maxsz)
817 #define NFS4_dec_exchange_id_sz \
818                                 (compound_decode_hdr_maxsz + \
819                                  decode_exchange_id_maxsz)
820 #define NFS4_enc_create_session_sz \
821                                 (compound_encode_hdr_maxsz + \
822                                  encode_create_session_maxsz)
823 #define NFS4_dec_create_session_sz \
824                                 (compound_decode_hdr_maxsz + \
825                                  decode_create_session_maxsz)
826 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
827                                          encode_destroy_session_maxsz)
828 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
829                                          decode_destroy_session_maxsz)
830 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
831                                          encode_destroy_clientid_maxsz)
832 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
833                                          decode_destroy_clientid_maxsz)
834 #define NFS4_enc_sequence_sz \
835                                 (compound_decode_hdr_maxsz + \
836                                  encode_sequence_maxsz)
837 #define NFS4_dec_sequence_sz \
838                                 (compound_decode_hdr_maxsz + \
839                                  decode_sequence_maxsz)
840 #endif
841 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
842                                          encode_sequence_maxsz + \
843                                          encode_putrootfh_maxsz + \
844                                          encode_fsinfo_maxsz)
845 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
846                                          decode_sequence_maxsz + \
847                                          decode_putrootfh_maxsz + \
848                                          decode_fsinfo_maxsz)
849 #if defined(CONFIG_NFS_V4_1)
850 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
851                                          encode_sequence_maxsz + \
852                                          encode_reclaim_complete_maxsz)
853 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
854                                          decode_sequence_maxsz + \
855                                          decode_reclaim_complete_maxsz)
856 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
857                                 encode_sequence_maxsz +\
858                                 encode_getdeviceinfo_maxsz)
859 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
860                                 decode_sequence_maxsz + \
861                                 decode_getdeviceinfo_maxsz)
862 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
863                                 encode_sequence_maxsz + \
864                                 encode_putfh_maxsz +        \
865                                 encode_layoutget_maxsz)
866 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
867                                 decode_sequence_maxsz + \
868                                 decode_putfh_maxsz +        \
869                                 decode_layoutget_maxsz)
870 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
871                                 encode_sequence_maxsz +\
872                                 encode_putfh_maxsz + \
873                                 encode_layoutcommit_maxsz + \
874                                 encode_getattr_maxsz)
875 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
876                                 decode_sequence_maxsz + \
877                                 decode_putfh_maxsz + \
878                                 decode_layoutcommit_maxsz + \
879                                 decode_getattr_maxsz)
880 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
881                                 encode_sequence_maxsz + \
882                                 encode_putfh_maxsz + \
883                                 encode_layoutreturn_maxsz)
884 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
885                                 decode_sequence_maxsz + \
886                                 decode_putfh_maxsz + \
887                                 decode_layoutreturn_maxsz)
888 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
889                                         encode_sequence_maxsz + \
890                                         encode_putrootfh_maxsz +\
891                                         encode_secinfo_no_name_maxsz)
892 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
893                                         decode_sequence_maxsz + \
894                                         decode_putrootfh_maxsz + \
895                                         decode_secinfo_no_name_maxsz)
896 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
897                                          encode_sequence_maxsz + \
898                                          encode_test_stateid_maxsz)
899 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
900                                          decode_sequence_maxsz + \
901                                          decode_test_stateid_maxsz)
902 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
903                                          encode_sequence_maxsz + \
904                                          encode_free_stateid_maxsz)
905 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
906                                          decode_sequence_maxsz + \
907                                          decode_free_stateid_maxsz)
908 
909 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
910                                       compound_encode_hdr_maxsz +
911                                       encode_sequence_maxsz +
912                                       encode_putfh_maxsz +
913                                       encode_getattr_maxsz) *
914                                      XDR_UNIT);
915 
916 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
917                                      compound_decode_hdr_maxsz +
918                                      decode_sequence_maxsz +
919                                      decode_putfh_maxsz) *
920                                     XDR_UNIT);
921 
922 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
923                                            compound_decode_hdr_maxsz +
924                                            decode_sequence_maxsz) *
925                                           XDR_UNIT);
926 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
927 #endif /* CONFIG_NFS_V4_1 */
928 
929 static const umode_t nfs_type2fmt[] = {
930         [NF4BAD] = 0,
931         [NF4REG] = S_IFREG,
932         [NF4DIR] = S_IFDIR,
933         [NF4BLK] = S_IFBLK,
934         [NF4CHR] = S_IFCHR,
935         [NF4LNK] = S_IFLNK,
936         [NF4SOCK] = S_IFSOCK,
937         [NF4FIFO] = S_IFIFO,
938         [NF4ATTRDIR] = 0,
939         [NF4NAMEDATTR] = 0,
940 };
941 
942 struct compound_hdr {
943         int32_t         status;
944         uint32_t        nops;
945         __be32 *        nops_p;
946         uint32_t        taglen;
947         char *          tag;
948         uint32_t        replen;         /* expected reply words */
949         u32             minorversion;
950 };
951 
952 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
953 {
954         __be32 *p = xdr_reserve_space(xdr, nbytes);
955         BUG_ON(!p);
956         return p;
957 }
958 
959 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
960 {
961         WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
962 }
963 
964 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
965 {
966         WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
967 }
968 
969 static void encode_uint32(struct xdr_stream *xdr, u32 n)
970 {
971         WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
972 }
973 
974 static void encode_uint64(struct xdr_stream *xdr, u64 n)
975 {
976         WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
977 }
978 
979 static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
980                 const __u32 *bitmap, size_t len)
981 {
982         ssize_t ret;
983 
984         /* Trim empty words */
985         while (len > 0 && bitmap[len-1] == 0)
986                 len--;
987         ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
988         if (WARN_ON_ONCE(ret < 0))
989                 return ret;
990         return len;
991 }
992 
993 static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
994                 __u32 *res, size_t len)
995 {
996         size_t i;
997         __u32 tmp;
998 
999         while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
1000                 len--;
1001         for (i = len; i-- > 0;) {
1002                 tmp = bitmap[i] & mask[i];
1003                 res[i] = tmp;
1004         }
1005         return len;
1006 }
1007 
1008 static void encode_nfs4_seqid(struct xdr_stream *xdr,
1009                 const struct nfs_seqid *seqid)
1010 {
1011         if (seqid != NULL)
1012                 encode_uint32(xdr, seqid->sequence->counter);
1013         else
1014                 encode_uint32(xdr, 0);
1015 }
1016 
1017 static void encode_compound_hdr(struct xdr_stream *xdr,
1018                                 struct rpc_rqst *req,
1019                                 struct compound_hdr *hdr)
1020 {
1021         __be32 *p;
1022 
1023         /* initialize running count of expected bytes in reply.
1024          * NOTE: the replied tag SHOULD be the same is the one sent,
1025          * but this is not required as a MUST for the server to do so. */
1026         hdr->replen = 3 + hdr->taglen;
1027 
1028         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
1029         encode_string(xdr, hdr->taglen, hdr->tag);
1030         p = reserve_space(xdr, 8);
1031         *p++ = cpu_to_be32(hdr->minorversion);
1032         hdr->nops_p = p;
1033         *p = cpu_to_be32(hdr->nops);
1034 }
1035 
1036 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
1037                 uint32_t replen,
1038                 struct compound_hdr *hdr)
1039 {
1040         encode_uint32(xdr, op);
1041         hdr->nops++;
1042         hdr->replen += replen;
1043 }
1044 
1045 static void encode_nops(struct compound_hdr *hdr)
1046 {
1047         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
1048         *hdr->nops_p = htonl(hdr->nops);
1049 }
1050 
1051 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1052 {
1053         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
1054 }
1055 
1056 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
1057 {
1058         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1059 }
1060 
1061 static __be32 *
1062 xdr_encode_nfstime4(__be32 *p, const struct timespec *t)
1063 {
1064         p = xdr_encode_hyper(p, (__s64)t->tv_sec);
1065         *p++ = cpu_to_be32(t->tv_nsec);
1066         return p;
1067 }
1068 
1069 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1070                                 const struct nfs4_label *label,
1071                                 const umode_t *umask,
1072                                 const struct nfs_server *server,
1073                                 const uint32_t attrmask[])
1074 {
1075         struct timespec ts;
1076         char owner_name[IDMAP_NAMESZ];
1077         char owner_group[IDMAP_NAMESZ];
1078         int owner_namelen = 0;
1079         int owner_grouplen = 0;
1080         __be32 *p;
1081         uint32_t len = 0;
1082         uint32_t bmval[3] = { 0 };
1083 
1084         /*
1085          * We reserve enough space to write the entire attribute buffer at once.
1086          */
1087         if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) {
1088                 bmval[0] |= FATTR4_WORD0_SIZE;
1089                 len += 8;
1090         }
1091         if (iap->ia_valid & ATTR_MODE) {
1092                 if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) {
1093                         bmval[2] |= FATTR4_WORD2_MODE_UMASK;
1094                         len += 8;
1095                 } else if (attrmask[1] & FATTR4_WORD1_MODE) {
1096                         bmval[1] |= FATTR4_WORD1_MODE;
1097                         len += 4;
1098                 }
1099         }
1100         if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) {
1101                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1102                 if (owner_namelen < 0) {
1103                         dprintk("nfs: couldn't resolve uid %d to string\n",
1104                                         from_kuid(&init_user_ns, iap->ia_uid));
1105                         /* XXX */
1106                         strcpy(owner_name, "nobody");
1107                         owner_namelen = sizeof("nobody") - 1;
1108                         /* goto out; */
1109                 }
1110                 bmval[1] |= FATTR4_WORD1_OWNER;
1111                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1112         }
1113         if ((iap->ia_valid & ATTR_GID) &&
1114            (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) {
1115                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1116                 if (owner_grouplen < 0) {
1117                         dprintk("nfs: couldn't resolve gid %d to string\n",
1118                                         from_kgid(&init_user_ns, iap->ia_gid));
1119                         strcpy(owner_group, "nobody");
1120                         owner_grouplen = sizeof("nobody") - 1;
1121                         /* goto out; */
1122                 }
1123                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1124                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1125         }
1126         if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1127                 if (iap->ia_valid & ATTR_ATIME_SET) {
1128                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1129                         len += 4 + (nfstime4_maxsz << 2);
1130                 } else if (iap->ia_valid & ATTR_ATIME) {
1131                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1132                         len += 4;
1133                 }
1134         }
1135         if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1136                 if (iap->ia_valid & ATTR_MTIME_SET) {
1137                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1138                         len += 4 + (nfstime4_maxsz << 2);
1139                 } else if (iap->ia_valid & ATTR_MTIME) {
1140                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1141                         len += 4;
1142                 }
1143         }
1144 
1145         if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1146                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1147                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1148         }
1149 
1150         xdr_encode_bitmap4(xdr, bmval, ARRAY_SIZE(bmval));
1151         xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);
1152 
1153         if (bmval[0] & FATTR4_WORD0_SIZE)
1154                 p = xdr_encode_hyper(p, iap->ia_size);
1155         if (bmval[1] & FATTR4_WORD1_MODE)
1156                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1157         if (bmval[1] & FATTR4_WORD1_OWNER)
1158                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1159         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1160                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1161         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1162                 if (iap->ia_valid & ATTR_ATIME_SET) {
1163                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1164                         ts = timespec64_to_timespec(iap->ia_atime);
1165                         p = xdr_encode_nfstime4(p, &ts);
1166                 } else
1167                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1168         }
1169         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1170                 if (iap->ia_valid & ATTR_MTIME_SET) {
1171                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1172                         ts = timespec64_to_timespec(iap->ia_mtime);
1173                         p = xdr_encode_nfstime4(p, &ts);
1174                 } else
1175                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1176         }
1177         if (label && (bmval[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1178                 *p++ = cpu_to_be32(label->lfs);
1179                 *p++ = cpu_to_be32(label->pi);
1180                 *p++ = cpu_to_be32(label->len);
1181                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1182         }
1183         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
1184                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1185                 *p++ = cpu_to_be32(*umask);
1186         }
1187 
1188 /* out: */
1189 }
1190 
1191 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1192 {
1193         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1194         encode_uint32(xdr, access);
1195 }
1196 
1197 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1198 {
1199         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1200         encode_nfs4_seqid(xdr, arg->seqid);
1201         encode_nfs4_stateid(xdr, &arg->stateid);
1202 }
1203 
1204 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1205 {
1206         __be32 *p;
1207 
1208         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1209         p = reserve_space(xdr, 12);
1210         p = xdr_encode_hyper(p, args->offset);
1211         *p = cpu_to_be32(args->count);
1212 }
1213 
1214 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1215 {
1216         __be32 *p;
1217 
1218         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1219         encode_uint32(xdr, create->ftype);
1220 
1221         switch (create->ftype) {
1222         case NF4LNK:
1223                 p = reserve_space(xdr, 4);
1224                 *p = cpu_to_be32(create->u.symlink.len);
1225                 xdr_write_pages(xdr, create->u.symlink.pages, 0,
1226                                 create->u.symlink.len);
1227                 xdr->buf->flags |= XDRBUF_WRITE;
1228                 break;
1229 
1230         case NF4BLK: case NF4CHR:
1231                 p = reserve_space(xdr, 8);
1232                 *p++ = cpu_to_be32(create->u.device.specdata1);
1233                 *p = cpu_to_be32(create->u.device.specdata2);
1234                 break;
1235 
1236         default:
1237                 break;
1238         }
1239 
1240         encode_string(xdr, create->name->len, create->name->name);
1241         encode_attrs(xdr, create->attrs, create->label, &create->umask,
1242                         create->server, create->server->attr_bitmask);
1243 }
1244 
1245 static void encode_getattr(struct xdr_stream *xdr,
1246                 const __u32 *bitmap, const __u32 *mask, size_t len,
1247                 struct compound_hdr *hdr)
1248 {
1249         __u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];
1250 
1251         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1252         if (mask) {
1253                 if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
1254                         len = ARRAY_SIZE(masked_bitmap);
1255                 len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
1256                 bitmap = masked_bitmap;
1257         }
1258         xdr_encode_bitmap4(xdr, bitmap, len);
1259 }
1260 
1261 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1262 {
1263         encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
1264                         ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
1265 }
1266 
1267 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1268                                  const u32 *open_bitmap,
1269                                  struct compound_hdr *hdr)
1270 {
1271         encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
1272 }
1273 
1274 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1275 {
1276         encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
1277                         ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
1278 }
1279 
1280 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1281 {
1282         encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
1283                         ARRAY_SIZE(nfs4_fs_locations_bitmap), hdr);
1284 }
1285 
1286 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1287 {
1288         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1289 }
1290 
1291 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1292 {
1293         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1294         encode_string(xdr, name->len, name->name);
1295 }
1296 
1297 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1298 {
1299         if (fl->fl_type == F_RDLCK)
1300                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1301         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1302 }
1303 
1304 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1305 {
1306         if (fl->fl_end == OFFSET_MAX)
1307                 return ~(uint64_t)0;
1308         return fl->fl_end - fl->fl_start + 1;
1309 }
1310 
1311 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1312 {
1313         __be32 *p;
1314 
1315         p = reserve_space(xdr, 32);
1316         p = xdr_encode_hyper(p, lowner->clientid);
1317         *p++ = cpu_to_be32(20);
1318         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1319         *p++ = cpu_to_be32(lowner->s_dev);
1320         xdr_encode_hyper(p, lowner->id);
1321 }
1322 
1323 /*
1324  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1325  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1326  */
1327 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1328 {
1329         __be32 *p;
1330 
1331         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1332         p = reserve_space(xdr, 28);
1333         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1334         *p++ = cpu_to_be32(args->reclaim);
1335         p = xdr_encode_hyper(p, args->fl->fl_start);
1336         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1337         *p = cpu_to_be32(args->new_lock_owner);
1338         if (args->new_lock_owner){
1339                 encode_nfs4_seqid(xdr, args->open_seqid);
1340                 encode_nfs4_stateid(xdr, &args->open_stateid);
1341                 encode_nfs4_seqid(xdr, args->lock_seqid);
1342                 encode_lockowner(xdr, &args->lock_owner);
1343         }
1344         else {
1345                 encode_nfs4_stateid(xdr, &args->lock_stateid);
1346                 encode_nfs4_seqid(xdr, args->lock_seqid);
1347         }
1348 }
1349 
1350 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1351 {
1352         __be32 *p;
1353 
1354         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1355         p = reserve_space(xdr, 20);
1356         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1357         p = xdr_encode_hyper(p, args->fl->fl_start);
1358         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1359         encode_lockowner(xdr, &args->lock_owner);
1360 }
1361 
1362 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1363 {
1364         __be32 *p;
1365 
1366         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1367         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1368         encode_nfs4_seqid(xdr, args->seqid);
1369         encode_nfs4_stateid(xdr, &args->stateid);
1370         p = reserve_space(xdr, 16);
1371         p = xdr_encode_hyper(p, args->fl->fl_start);
1372         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1373 }
1374 
1375 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1376 {
1377         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1378         encode_lockowner(xdr, lowner);
1379 }
1380 
1381 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1382 {
1383         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1384         encode_string(xdr, name->len, name->name);
1385 }
1386 
1387 static void encode_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
1388 {
1389         encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
1390 }
1391 
1392 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1393 {
1394         __be32 *p;
1395 
1396         p = reserve_space(xdr, 8);
1397         *p++ = cpu_to_be32(share_access);
1398         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1399 }
1400 
1401 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1402 {
1403         __be32 *p;
1404  /*
1405  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1406  * owner 4 = 32
1407  */
1408         encode_nfs4_seqid(xdr, arg->seqid);
1409         encode_share_access(xdr, arg->share_access);
1410         p = reserve_space(xdr, 36);
1411         p = xdr_encode_hyper(p, arg->clientid);
1412         *p++ = cpu_to_be32(24);
1413         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1414         *p++ = cpu_to_be32(arg->server->s_dev);
1415         *p++ = cpu_to_be32(arg->id.uniquifier);
1416         xdr_encode_hyper(p, arg->id.create_time);
1417 }
1418 
1419 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1420 {
1421         __be32 *p;
1422 
1423         p = reserve_space(xdr, 4);
1424         switch(arg->createmode) {
1425         case NFS4_CREATE_UNCHECKED:
1426                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1427                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1428                                 arg->server, arg->server->attr_bitmask);
1429                 break;
1430         case NFS4_CREATE_GUARDED:
1431                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1432                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1433                                 arg->server, arg->server->attr_bitmask);
1434                 break;
1435         case NFS4_CREATE_EXCLUSIVE:
1436                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1437                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1438                 break;
1439         case NFS4_CREATE_EXCLUSIVE4_1:
1440                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1441                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1442                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1443                                 arg->server, arg->server->exclcreat_bitmask);
1444         }
1445 }
1446 
1447 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1448 {
1449         __be32 *p;
1450 
1451         p = reserve_space(xdr, 4);
1452         switch (arg->open_flags & O_CREAT) {
1453         case 0:
1454                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1455                 break;
1456         default:
1457                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1458                 encode_createmode(xdr, arg);
1459         }
1460 }
1461 
1462 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1463 {
1464         __be32 *p;
1465 
1466         p = reserve_space(xdr, 4);
1467         switch (delegation_type) {
1468         case 0:
1469                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1470                 break;
1471         case FMODE_READ:
1472                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1473                 break;
1474         case FMODE_WRITE|FMODE_READ:
1475                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1476                 break;
1477         default:
1478                 BUG();
1479         }
1480 }
1481 
1482 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1483 {
1484         __be32 *p;
1485 
1486         p = reserve_space(xdr, 4);
1487         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1488         encode_string(xdr, name->len, name->name);
1489 }
1490 
1491 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1492 {
1493         __be32 *p;
1494 
1495         p = reserve_space(xdr, 4);
1496         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1497         encode_delegation_type(xdr, type);
1498 }
1499 
1500 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1501 {
1502         __be32 *p;
1503 
1504         p = reserve_space(xdr, 4);
1505         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1506         encode_nfs4_stateid(xdr, stateid);
1507         encode_string(xdr, name->len, name->name);
1508 }
1509 
1510 static inline void encode_claim_fh(struct xdr_stream *xdr)
1511 {
1512         __be32 *p;
1513 
1514         p = reserve_space(xdr, 4);
1515         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1516 }
1517 
1518 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1519 {
1520         __be32 *p;
1521 
1522         p = reserve_space(xdr, 4);
1523         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1524         encode_nfs4_stateid(xdr, stateid);
1525 }
1526 
1527 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1528 {
1529         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1530         encode_openhdr(xdr, arg);
1531         encode_opentype(xdr, arg);
1532         switch (arg->claim) {
1533         case NFS4_OPEN_CLAIM_NULL:
1534                 encode_claim_null(xdr, arg->name);
1535                 break;
1536         case NFS4_OPEN_CLAIM_PREVIOUS:
1537                 encode_claim_previous(xdr, arg->u.delegation_type);
1538                 break;
1539         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1540                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1541                 break;
1542         case NFS4_OPEN_CLAIM_FH:
1543                 encode_claim_fh(xdr);
1544                 break;
1545         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1546                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1547                 break;
1548         default:
1549                 BUG();
1550         }
1551 }
1552 
1553 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1554 {
1555         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1556         encode_nfs4_stateid(xdr, arg->stateid);
1557         encode_nfs4_seqid(xdr, arg->seqid);
1558 }
1559 
1560 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1561 {
1562         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1563         encode_nfs4_stateid(xdr, &arg->stateid);
1564         encode_nfs4_seqid(xdr, arg->seqid);
1565         encode_share_access(xdr, arg->share_access);
1566 }
1567 
1568 static void
1569 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1570 {
1571         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1572         encode_string(xdr, fh->size, fh->data);
1573 }
1574 
1575 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1576 {
1577         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1578 }
1579 
1580 static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1581                         struct compound_hdr *hdr)
1582 {
1583         __be32 *p;
1584 
1585         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1586         encode_nfs4_stateid(xdr, &args->stateid);
1587 
1588         p = reserve_space(xdr, 12);
1589         p = xdr_encode_hyper(p, args->offset);
1590         *p = cpu_to_be32(args->count);
1591 }
1592 
1593 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1594 {
1595         uint32_t attrs[3] = {
1596                 FATTR4_WORD0_RDATTR_ERROR,
1597                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1598         };
1599         uint32_t dircount = readdir->count >> 1;
1600         __be32 *p, verf[2];
1601         uint32_t attrlen = 0;
1602         unsigned int i;
1603 
1604         if (readdir->plus) {
1605                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1606                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1607                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1608                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1609                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1610                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1611                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1612                 dircount >>= 1;
1613         }
1614         /* Use mounted_on_fileid only if the server supports it */
1615         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1616                 attrs[0] |= FATTR4_WORD0_FILEID;
1617         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1618                 attrs[i] &= readdir->bitmask[i];
1619                 if (attrs[i] != 0)
1620                         attrlen = i+1;
1621         }
1622 
1623         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1624         encode_uint64(xdr, readdir->cookie);
1625         encode_nfs4_verifier(xdr, &readdir->verifier);
1626         p = reserve_space(xdr, 12 + (attrlen << 2));
1627         *p++ = cpu_to_be32(dircount);
1628         *p++ = cpu_to_be32(readdir->count);
1629         *p++ = cpu_to_be32(attrlen);
1630         for (i = 0; i < attrlen; i++)
1631                 *p++ = cpu_to_be32(attrs[i]);
1632         memcpy(verf, readdir->verifier.data, sizeof(verf));
1633 
1634         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1635                         __func__,
1636                         (unsigned long long)readdir->cookie,
1637                         verf[0], verf[1],
1638                         attrs[0] & readdir->bitmask[0],
1639                         attrs[1] & readdir->bitmask[1],
1640                         attrs[2] & readdir->bitmask[2]);
1641 }
1642 
1643 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1644 {
1645         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1646 }
1647 
1648 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1649 {
1650         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1651         encode_string(xdr, name->len, name->name);
1652 }
1653 
1654 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1655 {
1656         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1657         encode_string(xdr, oldname->len, oldname->name);
1658         encode_string(xdr, newname->len, newname->name);
1659 }
1660 
1661 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1662                          struct compound_hdr *hdr)
1663 {
1664         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1665         encode_uint64(xdr, clid);
1666 }
1667 
1668 static void
1669 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1670 {
1671         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1672 }
1673 
1674 static void
1675 encode_setacl(struct xdr_stream *xdr, const struct nfs_setaclargs *arg,
1676                 struct compound_hdr *hdr)
1677 {
1678         __be32 *p;
1679 
1680         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1681         encode_nfs4_stateid(xdr, &zero_stateid);
1682         p = reserve_space(xdr, 2*4);
1683         *p++ = cpu_to_be32(1);
1684         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1685         p = reserve_space(xdr, 4);
1686         *p = cpu_to_be32(arg->acl_len);
1687         xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
1688 }
1689 
1690 static void
1691 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1692 {
1693         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1694 }
1695 
1696 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1697 {
1698         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1699         encode_nfs4_stateid(xdr, &arg->stateid);
1700         encode_attrs(xdr, arg->iap, arg->label, NULL, server,
1701                         server->attr_bitmask);
1702 }
1703 
1704 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1705 {
1706         __be32 *p;
1707 
1708         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1709         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1710 
1711         encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1712                         setclientid->sc_clnt->cl_owner_id);
1713         p = reserve_space(xdr, 4);
1714         *p = cpu_to_be32(setclientid->sc_prog);
1715         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1716         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1717         p = reserve_space(xdr, 4);
1718         *p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1719 }
1720 
1721 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1722 {
1723         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1724                         decode_setclientid_confirm_maxsz, hdr);
1725         encode_uint64(xdr, arg->clientid);
1726         encode_nfs4_verifier(xdr, &arg->confirm);
1727 }
1728 
1729 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1730                          struct compound_hdr *hdr)
1731 {
1732         __be32 *p;
1733 
1734         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1735         encode_nfs4_stateid(xdr, &args->stateid);
1736 
1737         p = reserve_space(xdr, 16);
1738         p = xdr_encode_hyper(p, args->offset);
1739         *p++ = cpu_to_be32(args->stable);
1740         *p = cpu_to_be32(args->count);
1741 
1742         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1743 }
1744 
1745 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1746 {
1747         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1748         encode_nfs4_stateid(xdr, stateid);
1749 }
1750 
1751 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1752 {
1753         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1754         encode_string(xdr, name->len, name->name);
1755 }
1756 
1757 #if defined(CONFIG_NFS_V4_1)
1758 /* NFSv4.1 operations */
1759 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1760                                    const struct nfs41_bind_conn_to_session_args *args,
1761                                    struct compound_hdr *hdr)
1762 {
1763         __be32 *p;
1764 
1765         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1766                 decode_bind_conn_to_session_maxsz, hdr);
1767         encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1768         p = xdr_reserve_space(xdr, 8);
1769         *p++ = cpu_to_be32(args->dir);
1770         *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1771 }
1772 
1773 static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
1774 {
1775         unsigned int i;
1776         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1777         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1778                 encode_uint32(xdr, op_map->u.words[i]);
1779 }
1780 
1781 static void encode_exchange_id(struct xdr_stream *xdr,
1782                                const struct nfs41_exchange_id_args *args,
1783                                struct compound_hdr *hdr)
1784 {
1785         __be32 *p;
1786         char impl_name[IMPL_NAME_LIMIT];
1787         int len = 0;
1788 
1789         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1790         encode_nfs4_verifier(xdr, &args->verifier);
1791 
1792         encode_string(xdr, strlen(args->client->cl_owner_id),
1793                         args->client->cl_owner_id);
1794 
1795         encode_uint32(xdr, args->flags);
1796         encode_uint32(xdr, args->state_protect.how);
1797 
1798         switch (args->state_protect.how) {
1799         case SP4_NONE:
1800                 break;
1801         case SP4_MACH_CRED:
1802                 encode_op_map(xdr, &args->state_protect.enforce);
1803                 encode_op_map(xdr, &args->state_protect.allow);
1804                 break;
1805         default:
1806                 WARN_ON_ONCE(1);
1807                 break;
1808         }
1809 
1810         if (send_implementation_id &&
1811             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1812             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1813                 <= sizeof(impl_name) + 1)
1814                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1815                                utsname()->sysname, utsname()->release,
1816                                utsname()->version, utsname()->machine);
1817 
1818         if (len > 0) {
1819                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1820 
1821                 encode_string(xdr,
1822                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1823                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1824                 encode_string(xdr, len, impl_name);
1825                 /* just send zeros for nii_date - the date is in nii_name */
1826                 p = reserve_space(xdr, 12);
1827                 p = xdr_encode_hyper(p, 0);
1828                 *p = cpu_to_be32(0);
1829         } else
1830                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1831 }
1832 
1833 static void encode_create_session(struct xdr_stream *xdr,
1834                                   const struct nfs41_create_session_args *args,
1835                                   struct compound_hdr *hdr)
1836 {
1837         __be32 *p;
1838         struct nfs_client *clp = args->client;
1839         struct rpc_clnt *clnt = clp->cl_rpcclient;
1840         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1841         u32 max_resp_sz_cached;
1842 
1843         /*
1844          * Assumes OPEN is the biggest non-idempotent compound.
1845          * 2 is the verifier.
1846          */
1847         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
1848                                 * XDR_UNIT + RPC_MAX_AUTH_SIZE;
1849 
1850         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1851         p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1852         p = xdr_encode_hyper(p, args->clientid);
1853         *p++ = cpu_to_be32(args->seqid);                        /*Sequence id */
1854         *p++ = cpu_to_be32(args->flags);                        /*flags */
1855 
1856         /* Fore Channel */
1857         *p++ = cpu_to_be32(0);                          /* header padding size */
1858         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1859         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1860         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1861         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1862         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1863         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1864 
1865         /* Back Channel */
1866         *p++ = cpu_to_be32(0);                          /* header padding size */
1867         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1868         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1869         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1870         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1871         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1872         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1873 
1874         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1875         *p++ = cpu_to_be32(1);
1876         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1877 
1878         /* authsys_parms rfc1831 */
1879         *p++ = cpu_to_be32(ktime_to_ns(nn->boot_time)); /* stamp */
1880         p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1881         *p++ = cpu_to_be32(0);                          /* UID */
1882         *p++ = cpu_to_be32(0);                          /* GID */
1883         *p = cpu_to_be32(0);                            /* No more gids */
1884 }
1885 
1886 static void encode_destroy_session(struct xdr_stream *xdr,
1887                                    const struct nfs4_session *session,
1888                                    struct compound_hdr *hdr)
1889 {
1890         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1891         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1892 }
1893 
1894 static void encode_destroy_clientid(struct xdr_stream *xdr,
1895                                    uint64_t clientid,
1896                                    struct compound_hdr *hdr)
1897 {
1898         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1899         encode_uint64(xdr, clientid);
1900 }
1901 
1902 static void encode_reclaim_complete(struct xdr_stream *xdr,
1903                                     const struct nfs41_reclaim_complete_args *args,
1904                                     struct compound_hdr *hdr)
1905 {
1906         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1907         encode_uint32(xdr, args->one_fs);
1908 }
1909 #endif /* CONFIG_NFS_V4_1 */
1910 
1911 static void encode_sequence(struct xdr_stream *xdr,
1912                             const struct nfs4_sequence_args *args,
1913                             struct compound_hdr *hdr)
1914 {
1915 #if defined(CONFIG_NFS_V4_1)
1916         struct nfs4_session *session;
1917         struct nfs4_slot_table *tp;
1918         struct nfs4_slot *slot = args->sa_slot;
1919         __be32 *p;
1920 
1921         tp = slot->table;
1922         session = tp->session;
1923         if (!session)
1924                 return;
1925 
1926         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1927 
1928         /*
1929          * Sessionid + seqid + slotid + max slotid + cache_this
1930          */
1931         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1932                 "max_slotid=%d cache_this=%d\n",
1933                 __func__,
1934                 ((u32 *)session->sess_id.data)[0],
1935                 ((u32 *)session->sess_id.data)[1],
1936                 ((u32 *)session->sess_id.data)[2],
1937                 ((u32 *)session->sess_id.data)[3],
1938                 slot->seq_nr, slot->slot_nr,
1939                 tp->highest_used_slotid, args->sa_cache_this);
1940         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1941         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1942         *p++ = cpu_to_be32(slot->seq_nr);
1943         *p++ = cpu_to_be32(slot->slot_nr);
1944         *p++ = cpu_to_be32(tp->highest_used_slotid);
1945         *p = cpu_to_be32(args->sa_cache_this);
1946 #endif /* CONFIG_NFS_V4_1 */
1947 }
1948 
1949 #ifdef CONFIG_NFS_V4_1
1950 static void
1951 encode_getdeviceinfo(struct xdr_stream *xdr,
1952                      const struct nfs4_getdeviceinfo_args *args,
1953                      struct compound_hdr *hdr)
1954 {
1955         __be32 *p;
1956 
1957         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1958         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1959         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1960                                     NFS4_DEVICEID4_SIZE);
1961         *p++ = cpu_to_be32(args->pdev->layout_type);
1962         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1963 
1964         p = reserve_space(xdr, 4 + 4);
1965         *p++ = cpu_to_be32(1);                  /* bitmap length */
1966         *p++ = cpu_to_be32(args->notify_types);
1967 }
1968 
1969 static void
1970 encode_layoutget(struct xdr_stream *xdr,
1971                       const struct nfs4_layoutget_args *args,
1972                       struct compound_hdr *hdr)
1973 {
1974         __be32 *p;
1975 
1976         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1977         p = reserve_space(xdr, 36);
1978         *p++ = cpu_to_be32(0);     /* Signal layout available */
1979         *p++ = cpu_to_be32(args->type);
1980         *p++ = cpu_to_be32(args->range.iomode);
1981         p = xdr_encode_hyper(p, args->range.offset);
1982         p = xdr_encode_hyper(p, args->range.length);
1983         p = xdr_encode_hyper(p, args->minlength);
1984         encode_nfs4_stateid(xdr, &args->stateid);
1985         encode_uint32(xdr, args->maxcount);
1986 
1987         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1988                 __func__,
1989                 args->type,
1990                 args->range.iomode,
1991                 (unsigned long)args->range.offset,
1992                 (unsigned long)args->range.length,
1993                 args->maxcount);
1994 }
1995 
1996 static int
1997 encode_layoutcommit(struct xdr_stream *xdr,
1998                     struct inode *inode,
1999                     const struct nfs4_layoutcommit_args *args,
2000                     struct compound_hdr *hdr)
2001 {
2002         __be32 *p;
2003 
2004         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
2005                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
2006 
2007         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2008         p = reserve_space(xdr, 20);
2009         /* Only whole file layouts */
2010         p = xdr_encode_hyper(p, 0); /* offset */
2011         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
2012         *p = cpu_to_be32(0); /* reclaim */
2013         encode_nfs4_stateid(xdr, &args->stateid);
2014         if (args->lastbytewritten != U64_MAX) {
2015                 p = reserve_space(xdr, 20);
2016                 *p++ = cpu_to_be32(1); /* newoffset = TRUE */
2017                 p = xdr_encode_hyper(p, args->lastbytewritten);
2018         } else {
2019                 p = reserve_space(xdr, 12);
2020                 *p++ = cpu_to_be32(0); /* newoffset = FALSE */
2021         }
2022         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2023         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2024 
2025         encode_uint32(xdr, args->layoutupdate_len);
2026         if (args->layoutupdate_pages)
2027                 xdr_write_pages(xdr, args->layoutupdate_pages, 0,
2028                                 args->layoutupdate_len);
2029 
2030         return 0;
2031 }
2032 
2033 static void
2034 encode_layoutreturn(struct xdr_stream *xdr,
2035                     const struct nfs4_layoutreturn_args *args,
2036                     struct compound_hdr *hdr)
2037 {
2038         __be32 *p;
2039 
2040         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2041         p = reserve_space(xdr, 16);
2042         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2043         *p++ = cpu_to_be32(args->layout_type);
2044         *p++ = cpu_to_be32(args->range.iomode);
2045         *p = cpu_to_be32(RETURN_FILE);
2046         p = reserve_space(xdr, 16);
2047         p = xdr_encode_hyper(p, args->range.offset);
2048         p = xdr_encode_hyper(p, args->range.length);
2049         spin_lock(&args->inode->i_lock);
2050         encode_nfs4_stateid(xdr, &args->stateid);
2051         spin_unlock(&args->inode->i_lock);
2052         if (args->ld_private->ops && args->ld_private->ops->encode)
2053                 args->ld_private->ops->encode(xdr, args, args->ld_private);
2054         else
2055                 encode_uint32(xdr, 0);
2056 }
2057 
2058 static int
2059 encode_secinfo_no_name(struct xdr_stream *xdr,
2060                        const struct nfs41_secinfo_no_name_args *args,
2061                        struct compound_hdr *hdr)
2062 {
2063         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2064         encode_uint32(xdr, args->style);
2065         return 0;
2066 }
2067 
2068 static void encode_test_stateid(struct xdr_stream *xdr,
2069                                 const struct nfs41_test_stateid_args *args,
2070                                 struct compound_hdr *hdr)
2071 {
2072         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2073         encode_uint32(xdr, 1);
2074         encode_nfs4_stateid(xdr, args->stateid);
2075 }
2076 
2077 static void encode_free_stateid(struct xdr_stream *xdr,
2078                                 const struct nfs41_free_stateid_args *args,
2079                                 struct compound_hdr *hdr)
2080 {
2081         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2082         encode_nfs4_stateid(xdr, &args->stateid);
2083 }
2084 #else
2085 static inline void
2086 encode_layoutreturn(struct xdr_stream *xdr,
2087                     const struct nfs4_layoutreturn_args *args,
2088                     struct compound_hdr *hdr)
2089 {
2090 }
2091 
2092 static void
2093 encode_layoutget(struct xdr_stream *xdr,
2094                       const struct nfs4_layoutget_args *args,
2095                       struct compound_hdr *hdr)
2096 {
2097 }
2098 #endif /* CONFIG_NFS_V4_1 */
2099 
2100 /*
2101  * END OF "GENERIC" ENCODE ROUTINES.
2102  */
2103 
2104 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2105 {
2106 #if defined(CONFIG_NFS_V4_1)
2107         struct nfs4_session *session = args->sa_slot->table->session;
2108         if (session)
2109                 return session->clp->cl_mvops->minor_version;
2110 #endif /* CONFIG_NFS_V4_1 */
2111         return 0;
2112 }
2113 
2114 /*
2115  * Encode an ACCESS request
2116  */
2117 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2118                                 const void *data)
2119 {
2120         const struct nfs4_accessargs *args = data;
2121         struct compound_hdr hdr = {
2122                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2123         };
2124 
2125         encode_compound_hdr(xdr, req, &hdr);
2126         encode_sequence(xdr, &args->seq_args, &hdr);
2127         encode_putfh(xdr, args->fh, &hdr);
2128         encode_access(xdr, args->access, &hdr);
2129         if (args->bitmask)
2130                 encode_getfattr(xdr, args->bitmask, &hdr);
2131         encode_nops(&hdr);
2132 }
2133 
2134 /*
2135  * Encode LOOKUP request
2136  */
2137 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2138                                 const void *data)
2139 {
2140         const struct nfs4_lookup_arg *args = data;
2141         struct compound_hdr hdr = {
2142                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2143         };
2144 
2145         encode_compound_hdr(xdr, req, &hdr);
2146         encode_sequence(xdr, &args->seq_args, &hdr);
2147         encode_putfh(xdr, args->dir_fh, &hdr);
2148         encode_lookup(xdr, args->name, &hdr);
2149         encode_getfh(xdr, &hdr);
2150         encode_getfattr(xdr, args->bitmask, &hdr);
2151         encode_nops(&hdr);
2152 }
2153 
2154 /*
2155  * Encode LOOKUPP request
2156  */
2157 static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
2158                 const void *data)
2159 {
2160         const struct nfs4_lookupp_arg *args = data;
2161         struct compound_hdr hdr = {
2162                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2163         };
2164 
2165         encode_compound_hdr(xdr, req, &hdr);
2166         encode_sequence(xdr, &args->seq_args, &hdr);
2167         encode_putfh(xdr, args->fh, &hdr);
2168         encode_lookupp(xdr, &hdr);
2169         encode_getfh(xdr, &hdr);
2170         encode_getfattr(xdr, args->bitmask, &hdr);
2171         encode_nops(&hdr);
2172 }
2173 
2174 /*
2175  * Encode LOOKUP_ROOT request
2176  */
2177 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2178                                      struct xdr_stream *xdr,
2179                                      const void *data)
2180 {
2181         const struct nfs4_lookup_root_arg *args = data;
2182         struct compound_hdr hdr = {
2183                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2184         };
2185 
2186         encode_compound_hdr(xdr, req, &hdr);
2187         encode_sequence(xdr, &args->seq_args, &hdr);
2188         encode_putrootfh(xdr, &hdr);
2189         encode_getfh(xdr, &hdr);
2190         encode_getfattr(xdr, args->bitmask, &hdr);
2191         encode_nops(&hdr);
2192 }
2193 
2194 /*
2195  * Encode REMOVE request
2196  */
2197 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2198                                 const void *data)
2199 {
2200         const struct nfs_removeargs *args = data;
2201         struct compound_hdr hdr = {
2202                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2203         };
2204 
2205         encode_compound_hdr(xdr, req, &hdr);
2206         encode_sequence(xdr, &args->seq_args, &hdr);
2207         encode_putfh(xdr, args->fh, &hdr);
2208         encode_remove(xdr, &args->name, &hdr);
2209         encode_nops(&hdr);
2210 }
2211 
2212 /*
2213  * Encode RENAME request
2214  */
2215 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2216                                 const void *data)
2217 {
2218         const struct nfs_renameargs *args = data;
2219         struct compound_hdr hdr = {
2220                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2221         };
2222 
2223         encode_compound_hdr(xdr, req, &hdr);
2224         encode_sequence(xdr, &args->seq_args, &hdr);
2225         encode_putfh(xdr, args->old_dir, &hdr);
2226         encode_savefh(xdr, &hdr);
2227         encode_putfh(xdr, args->new_dir, &hdr);
2228         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2229         encode_nops(&hdr);
2230 }
2231 
2232 /*
2233  * Encode LINK request
2234  */
2235 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2236                               const void *data)
2237 {
2238         const struct nfs4_link_arg *args = data;
2239         struct compound_hdr hdr = {
2240                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2241         };
2242 
2243         encode_compound_hdr(xdr, req, &hdr);
2244         encode_sequence(xdr, &args->seq_args, &hdr);
2245         encode_putfh(xdr, args->fh, &hdr);
2246         encode_savefh(xdr, &hdr);
2247         encode_putfh(xdr, args->dir_fh, &hdr);
2248         encode_link(xdr, args->name, &hdr);
2249         encode_restorefh(xdr, &hdr);
2250         encode_getfattr(xdr, args->bitmask, &hdr);
2251         encode_nops(&hdr);
2252 }
2253 
2254 /*
2255  * Encode CREATE request
2256  */
2257 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2258                                 const void *data)
2259 {
2260         const struct nfs4_create_arg *args = data;
2261         struct compound_hdr hdr = {
2262                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2263         };
2264 
2265         encode_compound_hdr(xdr, req, &hdr);
2266         encode_sequence(xdr, &args->seq_args, &hdr);
2267         encode_putfh(xdr, args->dir_fh, &hdr);
2268         encode_create(xdr, args, &hdr);
2269         encode_getfh(xdr, &hdr);
2270         encode_getfattr(xdr, args->bitmask, &hdr);
2271         encode_nops(&hdr);
2272 }
2273 
2274 /*
2275  * Encode SYMLINK request
2276  */
2277 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2278                                  const void *data)
2279 {
2280         const struct nfs4_create_arg *args = data;
2281 
2282         nfs4_xdr_enc_create(req, xdr, args);
2283 }
2284 
2285 /*
2286  * Encode GETATTR request
2287  */
2288 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2289                                  const void *data)
2290 {
2291         const struct nfs4_getattr_arg *args = data;
2292         struct compound_hdr hdr = {
2293                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2294         };
2295 
2296         encode_compound_hdr(xdr, req, &hdr);
2297         encode_sequence(xdr, &args->seq_args, &hdr);
2298         encode_putfh(xdr, args->fh, &hdr);
2299         encode_getfattr(xdr, args->bitmask, &hdr);
2300         encode_nops(&hdr);
2301 }
2302 
2303 /*
2304  * Encode a CLOSE request
2305  */
2306 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2307                                const void *data)
2308 {
2309         const struct nfs_closeargs *args = data;
2310         struct compound_hdr hdr = {
2311                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2312         };
2313 
2314         encode_compound_hdr(xdr, req, &hdr);
2315         encode_sequence(xdr, &args->seq_args, &hdr);
2316         encode_putfh(xdr, args->fh, &hdr);
2317         if (args->lr_args)
2318                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2319         if (args->bitmask != NULL)
2320                 encode_getfattr(xdr, args->bitmask, &hdr);
2321         encode_close(xdr, args, &hdr);
2322         encode_nops(&hdr);
2323 }
2324 
2325 /*
2326  * Encode an OPEN request
2327  */
2328 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2329                               const void *data)
2330 {
2331         const struct nfs_openargs *args = data;
2332         struct compound_hdr hdr = {
2333                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2334         };
2335 
2336         encode_compound_hdr(xdr, req, &hdr);
2337         encode_sequence(xdr, &args->seq_args, &hdr);
2338         encode_putfh(xdr, args->fh, &hdr);
2339         encode_open(xdr, args, &hdr);
2340         encode_getfh(xdr, &hdr);
2341         if (args->access)
2342                 encode_access(xdr, args->access, &hdr);
2343         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2344         if (args->lg_args) {
2345                 encode_layoutget(xdr, args->lg_args, &hdr);
2346                 rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2347                                         args->lg_args->layout.pglen,
2348                                         hdr.replen);
2349         }
2350         encode_nops(&hdr);
2351 }
2352 
2353 /*
2354  * Encode an OPEN_CONFIRM request
2355  */
2356 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2357                                       struct xdr_stream *xdr,
2358                                       const void *data)
2359 {
2360         const struct nfs_open_confirmargs *args = data;
2361         struct compound_hdr hdr = {
2362                 .nops   = 0,
2363         };
2364 
2365         encode_compound_hdr(xdr, req, &hdr);
2366         encode_putfh(xdr, args->fh, &hdr);
2367         encode_open_confirm(xdr, args, &hdr);
2368         encode_nops(&hdr);
2369 }
2370 
2371 /*
2372  * Encode an OPEN request with no attributes.
2373  */
2374 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2375                                      struct xdr_stream *xdr,
2376                                      const void *data)
2377 {
2378         const struct nfs_openargs *args = data;
2379         struct compound_hdr hdr = {
2380                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2381         };
2382 
2383         encode_compound_hdr(xdr, req, &hdr);
2384         encode_sequence(xdr, &args->seq_args, &hdr);
2385         encode_putfh(xdr, args->fh, &hdr);
2386         encode_open(xdr, args, &hdr);
2387         if (args->access)
2388                 encode_access(xdr, args->access, &hdr);
2389         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2390         if (args->lg_args) {
2391                 encode_layoutget(xdr, args->lg_args, &hdr);
2392                 rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2393                                         args->lg_args->layout.pglen,
2394                                         hdr.replen);
2395         }
2396         encode_nops(&hdr);
2397 }
2398 
2399 /*
2400  * Encode an OPEN_DOWNGRADE request
2401  */
2402 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2403                                         struct xdr_stream *xdr,
2404                                         const void *data)
2405 {
2406         const struct nfs_closeargs *args = data;
2407         struct compound_hdr hdr = {
2408                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2409         };
2410 
2411         encode_compound_hdr(xdr, req, &hdr);
2412         encode_sequence(xdr, &args->seq_args, &hdr);
2413         encode_putfh(xdr, args->fh, &hdr);
2414         if (args->lr_args)
2415                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2416         encode_open_downgrade(xdr, args, &hdr);
2417         encode_nops(&hdr);
2418 }
2419 
2420 /*
2421  * Encode a LOCK request
2422  */
2423 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2424                               const void *data)
2425 {
2426         const struct nfs_lock_args *args = data;
2427         struct compound_hdr hdr = {
2428                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2429         };
2430 
2431         encode_compound_hdr(xdr, req, &hdr);
2432         encode_sequence(xdr, &args->seq_args, &hdr);
2433         encode_putfh(xdr, args->fh, &hdr);
2434         encode_lock(xdr, args, &hdr);
2435         encode_nops(&hdr);
2436 }
2437 
2438 /*
2439  * Encode a LOCKT request
2440  */
2441 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2442                                const void *data)
2443 {
2444         const struct nfs_lockt_args *args = data;
2445         struct compound_hdr hdr = {
2446                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2447         };
2448 
2449         encode_compound_hdr(xdr, req, &hdr);
2450         encode_sequence(xdr, &args->seq_args, &hdr);
2451         encode_putfh(xdr, args->fh, &hdr);
2452         encode_lockt(xdr, args, &hdr);
2453         encode_nops(&hdr);
2454 }
2455 
2456 /*
2457  * Encode a LOCKU request
2458  */
2459 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2460                                const void *data)
2461 {
2462         const struct nfs_locku_args *args = data;
2463         struct compound_hdr hdr = {
2464                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2465         };
2466 
2467         encode_compound_hdr(xdr, req, &hdr);
2468         encode_sequence(xdr, &args->seq_args, &hdr);
2469         encode_putfh(xdr, args->fh, &hdr);
2470         encode_locku(xdr, args, &hdr);
2471         encode_nops(&hdr);
2472 }
2473 
2474 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2475                                            struct xdr_stream *xdr,
2476                                            const void *data)
2477 {
2478         const struct nfs_release_lockowner_args *args = data;
2479         struct compound_hdr hdr = {
2480                 .minorversion = 0,
2481         };
2482 
2483         encode_compound_hdr(xdr, req, &hdr);
2484         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2485         encode_nops(&hdr);
2486 }
2487 
2488 /*
2489  * Encode a READLINK request
2490  */
2491 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2492                                   const void *data)
2493 {
2494         const struct nfs4_readlink *args = data;
2495         struct compound_hdr hdr = {
2496                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2497         };
2498 
2499         encode_compound_hdr(xdr, req, &hdr);
2500         encode_sequence(xdr, &args->seq_args, &hdr);
2501         encode_putfh(xdr, args->fh, &hdr);
2502         encode_readlink(xdr, args, req, &hdr);
2503 
2504         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2505                                 args->pglen, hdr.replen);
2506         encode_nops(&hdr);
2507 }
2508 
2509 /*
2510  * Encode a READDIR request
2511  */
2512 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2513                                  const void *data)
2514 {
2515         const struct nfs4_readdir_arg *args = data;
2516         struct compound_hdr hdr = {
2517                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2518         };
2519 
2520         encode_compound_hdr(xdr, req, &hdr);
2521         encode_sequence(xdr, &args->seq_args, &hdr);
2522         encode_putfh(xdr, args->fh, &hdr);
2523         encode_readdir(xdr, args, req, &hdr);
2524 
2525         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2526                                 args->count, hdr.replen);
2527         encode_nops(&hdr);
2528 }
2529 
2530 /*
2531  * Encode a READ request
2532  */
2533 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2534                               const void *data)
2535 {
2536         const struct nfs_pgio_args *args = data;
2537         struct compound_hdr hdr = {
2538                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2539         };
2540 
2541         encode_compound_hdr(xdr, req, &hdr);
2542         encode_sequence(xdr, &args->seq_args, &hdr);
2543         encode_putfh(xdr, args->fh, &hdr);
2544         encode_read(xdr, args, &hdr);
2545 
2546         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2547                                 args->count, hdr.replen);
2548         req->rq_rcv_buf.flags |= XDRBUF_READ;
2549         encode_nops(&hdr);
2550 }
2551 
2552 /*
2553  * Encode an SETATTR request
2554  */
2555 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2556                                  const void *data)
2557 {
2558         const struct nfs_setattrargs *args = data;
2559         struct compound_hdr hdr = {
2560                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2561         };
2562 
2563         encode_compound_hdr(xdr, req, &hdr);
2564         encode_sequence(xdr, &args->seq_args, &hdr);
2565         encode_putfh(xdr, args->fh, &hdr);
2566         encode_setattr(xdr, args, args->server, &hdr);
2567         encode_getfattr(xdr, args->bitmask, &hdr);
2568         encode_nops(&hdr);
2569 }
2570 
2571 /*
2572  * Encode a GETACL request
2573  */
2574 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2575                                 const void *data)
2576 {
2577         const struct nfs_getaclargs *args = data;
2578         struct compound_hdr hdr = {
2579                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2580         };
2581         const __u32 nfs4_acl_bitmap[1] = {
2582                 [0] = FATTR4_WORD0_ACL,
2583         };
2584         uint32_t replen;
2585 
2586         encode_compound_hdr(xdr, req, &hdr);
2587         encode_sequence(xdr, &args->seq_args, &hdr);
2588         encode_putfh(xdr, args->fh, &hdr);
2589         replen = hdr.replen + op_decode_hdr_maxsz;
2590         encode_getattr(xdr, nfs4_acl_bitmap, NULL,
2591                         ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
2592 
2593         rpc_prepare_reply_pages(req, args->acl_pages, 0,
2594                                 args->acl_len, replen + 1);
2595         encode_nops(&hdr);
2596 }
2597 
2598 /*
2599  * Encode a WRITE request
2600  */
2601 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2602                                const void *data)
2603 {
2604         const struct nfs_pgio_args *args = data;
2605         struct compound_hdr hdr = {
2606                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2607         };
2608 
2609         encode_compound_hdr(xdr, req, &hdr);
2610         encode_sequence(xdr, &args->seq_args, &hdr);
2611         encode_putfh(xdr, args->fh, &hdr);
2612         encode_write(xdr, args, &hdr);
2613         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2614         if (args->bitmask)
2615                 encode_getfattr(xdr, args->bitmask, &hdr);
2616         encode_nops(&hdr);
2617 }
2618 
2619 /*
2620  *  a COMMIT request
2621  */
2622 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2623                                 const void *data)
2624 {
2625         const struct nfs_commitargs *args = data;
2626         struct compound_hdr hdr = {
2627                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2628         };
2629 
2630         encode_compound_hdr(xdr, req, &hdr);
2631         encode_sequence(xdr, &args->seq_args, &hdr);
2632         encode_putfh(xdr, args->fh, &hdr);
2633         encode_commit(xdr, args, &hdr);
2634         encode_nops(&hdr);
2635 }
2636 
2637 /*
2638  * FSINFO request
2639  */
2640 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2641                                 const void *data)
2642 {
2643         const struct nfs4_fsinfo_arg *args = data;
2644         struct compound_hdr hdr = {
2645                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2646         };
2647 
2648         encode_compound_hdr(xdr, req, &hdr);
2649         encode_sequence(xdr, &args->seq_args, &hdr);
2650         encode_putfh(xdr, args->fh, &hdr);
2651         encode_fsinfo(xdr, args->bitmask, &hdr);
2652         encode_nops(&hdr);
2653 }
2654 
2655 /*
2656  * a PATHCONF request
2657  */
2658 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2659                                   const void *data)
2660 {
2661         const struct nfs4_pathconf_arg *args = data;
2662         struct compound_hdr hdr = {
2663                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2664         };
2665 
2666         encode_compound_hdr(xdr, req, &hdr);
2667         encode_sequence(xdr, &args->seq_args, &hdr);
2668         encode_putfh(xdr, args->fh, &hdr);
2669         encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
2670                         ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
2671         encode_nops(&hdr);
2672 }
2673 
2674 /*
2675  * a STATFS request
2676  */
2677 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2678                                 const void *data)
2679 {
2680         const struct nfs4_statfs_arg *args = data;
2681         struct compound_hdr hdr = {
2682                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2683         };
2684 
2685         encode_compound_hdr(xdr, req, &hdr);
2686         encode_sequence(xdr, &args->seq_args, &hdr);
2687         encode_putfh(xdr, args->fh, &hdr);
2688         encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
2689                         ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
2690         encode_nops(&hdr);
2691 }
2692 
2693 /*
2694  * GETATTR_BITMAP request
2695  */
2696 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2697                                      struct xdr_stream *xdr,
2698                                      const void *data)
2699 {
2700         const struct nfs4_server_caps_arg *args = data;
2701         const u32 *bitmask = args->bitmask;
2702         struct compound_hdr hdr = {
2703                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2704         };
2705 
2706         encode_compound_hdr(xdr, req, &hdr);
2707         encode_sequence(xdr, &args->seq_args, &hdr);
2708         encode_putfh(xdr, args->fhandle, &hdr);
2709         encode_getattr(xdr, bitmask, NULL, 3, &hdr);
2710         encode_nops(&hdr);
2711 }
2712 
2713 /*
2714  * a RENEW request
2715  */
2716 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2717                                const void *data)
2718 
2719 {
2720         const struct nfs_client *clp = data;
2721         struct compound_hdr hdr = {
2722                 .nops   = 0,
2723         };
2724 
2725         encode_compound_hdr(xdr, req, &hdr);
2726         encode_renew(xdr, clp->cl_clientid, &hdr);
2727         encode_nops(&hdr);
2728 }
2729 
2730 /*
2731  * a SETCLIENTID request
2732  */
2733 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2734                                      struct xdr_stream *xdr,
2735                                      const void *data)
2736 {
2737         const struct nfs4_setclientid *sc = data;
2738         struct compound_hdr hdr = {
2739                 .nops   = 0,
2740         };
2741 
2742         encode_compound_hdr(xdr, req, &hdr);
2743         encode_setclientid(xdr, sc, &hdr);
2744         encode_nops(&hdr);
2745 }
2746 
2747 /*
2748  * a SETCLIENTID_CONFIRM request
2749  */
2750 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2751                                              struct xdr_stream *xdr,
2752                                              const void *data)
2753 {
2754         const struct nfs4_setclientid_res *arg = data;
2755         struct compound_hdr hdr = {
2756                 .nops   = 0,
2757         };
2758 
2759         encode_compound_hdr(xdr, req, &hdr);
2760         encode_setclientid_confirm(xdr, arg, &hdr);
2761         encode_nops(&hdr);
2762 }
2763 
2764 /*
2765  * DELEGRETURN request
2766  */
2767 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2768                                      struct xdr_stream *xdr,
2769                                      const void *data)
2770 {
2771         const struct nfs4_delegreturnargs *args = data;
2772         struct compound_hdr hdr = {
2773                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2774         };
2775 
2776         encode_compound_hdr(xdr, req, &hdr);
2777         encode_sequence(xdr, &args->seq_args, &hdr);
2778         encode_putfh(xdr, args->fhandle, &hdr);
2779         if (args->lr_args)
2780                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2781         if (args->bitmask)
2782                 encode_getfattr(xdr, args->bitmask, &hdr);
2783         encode_delegreturn(xdr, args->stateid, &hdr);
2784         encode_nops(&hdr);
2785 }
2786 
2787 /*
2788  * Encode FS_LOCATIONS request
2789  */
2790 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2791                                       struct xdr_stream *xdr,
2792                                       const void *data)
2793 {
2794         const struct nfs4_fs_locations_arg *args = data;
2795         struct compound_hdr hdr = {
2796                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2797         };
2798         uint32_t replen;
2799 
2800         encode_compound_hdr(xdr, req, &hdr);
2801         encode_sequence(xdr, &args->seq_args, &hdr);
2802         if (args->migration) {
2803                 encode_putfh(xdr, args->fh, &hdr);
2804                 replen = hdr.replen;
2805                 encode_fs_locations(xdr, args->bitmask, &hdr);
2806                 if (args->renew)
2807                         encode_renew(xdr, args->clientid, &hdr);
2808         } else {
2809                 encode_putfh(xdr, args->dir_fh, &hdr);
2810                 encode_lookup(xdr, args->name, &hdr);
2811                 replen = hdr.replen;
2812                 encode_fs_locations(xdr, args->bitmask, &hdr);
2813         }
2814 
2815         rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
2816                                 PAGE_SIZE, replen + 1);
2817         encode_nops(&hdr);
2818 }
2819 
2820 /*
2821  * Encode SECINFO request
2822  */
2823 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2824                                 struct xdr_stream *xdr,
2825                                 const void *data)
2826 {
2827         const struct nfs4_secinfo_arg *args = data;
2828         struct compound_hdr hdr = {
2829                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2830         };
2831 
2832         encode_compound_hdr(xdr, req, &hdr);
2833         encode_sequence(xdr, &args->seq_args, &hdr);
2834         encode_putfh(xdr, args->dir_fh, &hdr);
2835         encode_secinfo(xdr, args->name, &hdr);
2836         encode_nops(&hdr);
2837 }
2838 
2839 /*
2840  * Encode FSID_PRESENT request
2841  */
2842 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2843                                       struct xdr_stream *xdr,
2844                                       const void *data)
2845 {
2846         const struct nfs4_fsid_present_arg *args = data;
2847         struct compound_hdr hdr = {
2848                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2849         };
2850 
2851         encode_compound_hdr(xdr, req, &hdr);
2852         encode_sequence(xdr, &args->seq_args, &hdr);
2853         encode_putfh(xdr, args->fh, &hdr);
2854         encode_getfh(xdr, &hdr);
2855         if (args->renew)
2856                 encode_renew(xdr, args->clientid, &hdr);
2857         encode_nops(&hdr);
2858 }
2859 
2860 #if defined(CONFIG_NFS_V4_1)
2861 /*
2862  * BIND_CONN_TO_SESSION request
2863  */
2864 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2865                                 struct xdr_stream *xdr,
2866                                 const void *data)
2867 {
2868         const struct nfs41_bind_conn_to_session_args *args = data;
2869         struct compound_hdr hdr = {
2870                 .minorversion = args->client->cl_mvops->minor_version,
2871         };
2872 
2873         encode_compound_hdr(xdr, req, &hdr);
2874         encode_bind_conn_to_session(xdr, args, &hdr);
2875         encode_nops(&hdr);
2876 }
2877 
2878 /*
2879  * EXCHANGE_ID request
2880  */
2881 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2882                                      struct xdr_stream *xdr,
2883                                      const void *data)
2884 {
2885         const struct nfs41_exchange_id_args *args = data;
2886         struct compound_hdr hdr = {
2887                 .minorversion = args->client->cl_mvops->minor_version,
2888         };
2889 
2890         encode_compound_hdr(xdr, req, &hdr);
2891         encode_exchange_id(xdr, args, &hdr);
2892         encode_nops(&hdr);
2893 }
2894 
2895 /*
2896  * a CREATE_SESSION request
2897  */
2898 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2899                                         struct xdr_stream *xdr,
2900                                         const void *data)
2901 {
2902         const struct nfs41_create_session_args *args = data;
2903         struct compound_hdr hdr = {
2904                 .minorversion = args->client->cl_mvops->minor_version,
2905         };
2906 
2907         encode_compound_hdr(xdr, req, &hdr);
2908         encode_create_session(xdr, args, &hdr);
2909         encode_nops(&hdr);
2910 }
2911 
2912 /*
2913  * a DESTROY_SESSION request
2914  */
2915 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2916                                          struct xdr_stream *xdr,
2917                                          const void *data)
2918 {
2919         const struct nfs4_session *session = data;
2920         struct compound_hdr hdr = {
2921                 .minorversion = session->clp->cl_mvops->minor_version,
2922         };
2923 
2924         encode_compound_hdr(xdr, req, &hdr);
2925         encode_destroy_session(xdr, session, &hdr);
2926         encode_nops(&hdr);
2927 }
2928 
2929 /*
2930  * a DESTROY_CLIENTID request
2931  */
2932 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2933                                          struct xdr_stream *xdr,
2934                                          const void *data)
2935 {
2936         const struct nfs_client *clp = data;
2937         struct compound_hdr hdr = {
2938                 .minorversion = clp->cl_mvops->minor_version,
2939         };
2940 
2941         encode_compound_hdr(xdr, req, &hdr);
2942         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2943         encode_nops(&hdr);
2944 }
2945 
2946 /*
2947  * a SEQUENCE request
2948  */
2949 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2950                                   const void *data)
2951 {
2952         const struct nfs4_sequence_args *args = data;
2953         struct compound_hdr hdr = {
2954                 .minorversion = nfs4_xdr_minorversion(args),
2955         };
2956 
2957         encode_compound_hdr(xdr, req, &hdr);
2958         encode_sequence(xdr, args, &hdr);
2959         encode_nops(&hdr);
2960 }
2961 
2962 #endif
2963 
2964 /*
2965  * a GET_LEASE_TIME request
2966  */
2967 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2968                                         struct xdr_stream *xdr,
2969                                         const void *data)
2970 {
2971         const struct nfs4_get_lease_time_args *args = data;
2972         struct compound_hdr hdr = {
2973                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2974         };
2975         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2976 
2977         encode_compound_hdr(xdr, req, &hdr);
2978         encode_sequence(xdr, &args->la_seq_args, &hdr);
2979         encode_putrootfh(xdr, &hdr);
2980         encode_fsinfo(xdr, lease_bitmap, &hdr);
2981         encode_nops(&hdr);
2982 }
2983 
2984 #ifdef CONFIG_NFS_V4_1
2985 
2986 /*
2987  * a RECLAIM_COMPLETE request
2988  */
2989 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2990                                           struct xdr_stream *xdr,
2991                                           const void *data)
2992 {
2993         const struct nfs41_reclaim_complete_args *args = data;
2994         struct compound_hdr hdr = {
2995                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2996         };
2997 
2998         encode_compound_hdr(xdr, req, &hdr);
2999         encode_sequence(xdr, &args->seq_args, &hdr);
3000         encode_reclaim_complete(xdr, args, &hdr);
3001         encode_nops(&hdr);
3002 }
3003 
3004 /*
3005  * Encode GETDEVICEINFO request
3006  */
3007 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
3008                                        struct xdr_stream *xdr,
3009                                        const void *data)
3010 {
3011         const struct nfs4_getdeviceinfo_args *args = data;
3012         struct compound_hdr hdr = {
3013                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3014         };
3015 
3016         encode_compound_hdr(xdr, req, &hdr);
3017         encode_sequence(xdr, &args->seq_args, &hdr);
3018         encode_getdeviceinfo(xdr, args, &hdr);
3019 
3020         /* set up reply kvec. Subtract notification bitmap max size (2)
3021          * so that notification bitmap is put in xdr_buf tail */
3022         rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
3023                                 args->pdev->pglen, hdr.replen - 2);
3024         encode_nops(&hdr);
3025 }
3026 
3027 /*
3028  *  Encode LAYOUTGET request
3029  */
3030 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
3031                                    struct xdr_stream *xdr,
3032                                    const void *data)
3033 {
3034         const struct nfs4_layoutget_args *args = data;
3035         struct compound_hdr hdr = {
3036                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3037         };
3038 
3039         encode_compound_hdr(xdr, req, &hdr);
3040         encode_sequence(xdr, &args->seq_args, &hdr);
3041         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3042         encode_layoutget(xdr, args, &hdr);
3043 
3044         rpc_prepare_reply_pages(req, args->layout.pages, 0,
3045                                 args->layout.pglen, hdr.replen);
3046         encode_nops(&hdr);
3047 }
3048 
3049 /*
3050  *  Encode LAYOUTCOMMIT request
3051  */
3052 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
3053                                       struct xdr_stream *xdr,
3054                                       const void *priv)
3055 {
3056         const struct nfs4_layoutcommit_args *args = priv;
3057         struct nfs4_layoutcommit_data *data =
3058                 container_of(args, struct nfs4_layoutcommit_data, args);
3059         struct compound_hdr hdr = {
3060                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3061         };
3062 
3063         encode_compound_hdr(xdr, req, &hdr);
3064         encode_sequence(xdr, &args->seq_args, &hdr);
3065         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3066         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
3067         encode_getfattr(xdr, args->bitmask, &hdr);
3068         encode_nops(&hdr);
3069 }
3070 
3071 /*
3072  * Encode LAYOUTRETURN request
3073  */
3074 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
3075                                       struct xdr_stream *xdr,
3076                                       const void *data)
3077 {
3078         const struct nfs4_layoutreturn_args *args = data;
3079         struct compound_hdr hdr = {
3080                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3081         };
3082 
3083         encode_compound_hdr(xdr, req, &hdr);
3084         encode_sequence(xdr, &args->seq_args, &hdr);
3085         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3086         encode_layoutreturn(xdr, args, &hdr);
3087         encode_nops(&hdr);
3088 }
3089 
3090 /*
3091  * Encode SECINFO_NO_NAME request
3092  */
3093 static void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3094                                         struct xdr_stream *xdr,
3095                                         const void *data)
3096 {
3097         const struct nfs41_secinfo_no_name_args *args = data;
3098         struct compound_hdr hdr = {
3099                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3100         };
3101 
3102         encode_compound_hdr(xdr, req, &hdr);
3103         encode_sequence(xdr, &args->seq_args, &hdr);
3104         encode_putrootfh(xdr, &hdr);
3105         encode_secinfo_no_name(xdr, args, &hdr);
3106         encode_nops(&hdr);
3107 }
3108 
3109 /*
3110  *  Encode TEST_STATEID request
3111  */
3112 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3113                                       struct xdr_stream *xdr,
3114                                       const void *data)
3115 {
3116         const struct nfs41_test_stateid_args *args = data;
3117         struct compound_hdr hdr = {
3118                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3119         };
3120 
3121         encode_compound_hdr(xdr, req, &hdr);
3122         encode_sequence(xdr, &args->seq_args, &hdr);
3123         encode_test_stateid(xdr, args, &hdr);
3124         encode_nops(&hdr);
3125 }
3126 
3127 /*
3128  *  Encode FREE_STATEID request
3129  */
3130 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3131                                      struct xdr_stream *xdr,
3132                                      const void *data)
3133 {
3134         const struct nfs41_free_stateid_args *args = data;
3135         struct compound_hdr hdr = {
3136                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3137         };
3138 
3139         encode_compound_hdr(xdr, req, &hdr);
3140         encode_sequence(xdr, &args->seq_args, &hdr);
3141         encode_free_stateid(xdr, args, &hdr);
3142         encode_nops(&hdr);
3143 }
3144 #endif /* CONFIG_NFS_V4_1 */
3145 
3146 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3147 {
3148         ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
3149                         NFS4_OPAQUE_LIMIT);
3150         if (unlikely(ret < 0))
3151                 return -EIO;
3152         *len = ret;
3153         return 0;
3154 }
3155 
3156 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3157 {
3158         __be32 *p;
3159 
3160         p = xdr_inline_decode(xdr, 8);
3161         if (unlikely(!p))
3162                 return -EIO;
3163         hdr->status = be32_to_cpup(p++);
3164         hdr->taglen = be32_to_cpup(p);
3165 
3166         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3167         if (unlikely(!p))
3168                 return -EIO;
3169         hdr->tag = (char *)p;
3170         p += XDR_QUADLEN(hdr->taglen);
3171         hdr->nops = be32_to_cpup(p);
3172         if (unlikely(hdr->nops < 1))
3173                 return nfs4_stat_to_errno(hdr->status);
3174         return 0;
3175 }
3176 
3177 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3178                 int *nfs_retval)
3179 {
3180         __be32 *p;
3181         uint32_t opnum;
3182         int32_t nfserr;
3183 
3184         p = xdr_inline_decode(xdr, 8);
3185         if (unlikely(!p))
3186                 goto out_overflow;
3187         opnum = be32_to_cpup(p++);
3188         if (unlikely(opnum != expected))
3189                 goto out_bad_operation;
3190         if (unlikely(*p != cpu_to_be32(NFS_OK)))
3191                 goto out_status;
3192         *nfs_retval = 0;
3193         return true;
3194 out_status:
3195         nfserr = be32_to_cpup(p);
3196         trace_nfs4_xdr_status(xdr, opnum, nfserr);
3197         *nfs_retval = nfs4_stat_to_errno(nfserr);
3198         return true;
3199 out_bad_operation:
3200         dprintk("nfs: Server returned operation"
3201                 " %d but we issued a request for %d\n",
3202                         opnum, expected);
3203         *nfs_retval = -EREMOTEIO;
3204         return false;
3205 out_overflow:
3206         *nfs_retval = -EIO;
3207         return false;
3208 }
3209 
3210 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3211 {
3212         int retval;
3213 
3214         __decode_op_hdr(xdr, expected, &retval);
3215         return retval;
3216 }
3217 
3218 /* Dummy routine */
3219 static int decode_ace(struct xdr_stream *xdr, void *ace)
3220 {
3221         __be32 *p;
3222         unsigned int strlen;
3223         char *str;
3224 
3225         p = xdr_inline_decode(xdr, 12);
3226         if (unlikely(!p))
3227                 return -EIO;
3228         return decode_opaque_inline(xdr, &strlen, &str);
3229 }
3230 
3231 static ssize_t
3232 decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
3233 {
3234         ssize_t ret;
3235 
3236         ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
3237         if (likely(ret >= 0))
3238                 return ret;
3239         if (ret != -EMSGSIZE)
3240                 return -EIO;
3241         return sz;
3242 }
3243 
3244 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3245 {
3246         ssize_t ret;
3247         ret = decode_bitmap4(xdr, bitmap, 3);
3248         return ret < 0 ? ret : 0;
3249 }
3250 
3251 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3252 {
3253         __be32 *p;
3254 
3255         p = xdr_inline_decode(xdr, 4);
3256         if (unlikely(!p))
3257                 return -EIO;
3258         *attrlen = be32_to_cpup(p);
3259         *savep = xdr_stream_pos(xdr);
3260         return 0;
3261 }
3262 
3263 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3264 {
3265         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3266                 int ret;
3267                 ret = decode_attr_bitmap(xdr, bitmask);
3268                 if (unlikely(ret < 0))
3269                         return ret;
3270                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3271         } else
3272                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3273         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3274                 bitmask[0], bitmask[1], bitmask[2]);
3275         return 0;
3276 }
3277 
3278 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3279 {
3280         __be32 *p;
3281         int ret = 0;
3282 
3283         *type = 0;
3284         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3285                 return -EIO;
3286         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3287                 p = xdr_inline_decode(xdr, 4);
3288                 if (unlikely(!p))
3289                         return -EIO;
3290                 *type = be32_to_cpup(p);
3291                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3292                         dprintk("%s: bad type %d\n", __func__, *type);
3293                         return -EIO;
3294                 }
3295                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3296                 ret = NFS_ATTR_FATTR_TYPE;
3297         }
3298         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3299         return ret;
3300 }
3301 
3302 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3303                                       uint32_t *bitmap, uint32_t *type)
3304 {
3305         __be32 *p;
3306 
3307         *type = 0;
3308         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3309                 return -EIO;
3310         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3311                 p = xdr_inline_decode(xdr, 4);
3312                 if (unlikely(!p))
3313                         return -EIO;
3314                 *type = be32_to_cpup(p);
3315                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3316         }
3317         dprintk("%s: expire type=0x%x\n", __func__, *type);
3318         return 0;
3319 }
3320 
3321 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3322 {
3323         __be32 *p;
3324         int ret = 0;
3325 
3326         *change = 0;
3327         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3328                 return -EIO;
3329         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3330                 p = xdr_inline_decode(xdr, 8);
3331                 if (unlikely(!p))
3332                         return -EIO;
3333                 xdr_decode_hyper(p, change);
3334                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3335                 ret = NFS_ATTR_FATTR_CHANGE;
3336         }
3337         dprintk("%s: change attribute=%Lu\n", __func__,
3338                         (unsigned long long)*change);
3339         return ret;
3340 }
3341 
3342 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3343 {
3344         __be32 *p;
3345         int ret = 0;
3346 
3347         *size = 0;
3348         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3349                 return -EIO;
3350         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3351                 p = xdr_inline_decode(xdr, 8);
3352                 if (unlikely(!p))
3353                         return -EIO;
3354                 xdr_decode_hyper(p, size);
3355                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3356                 ret = NFS_ATTR_FATTR_SIZE;
3357         }
3358         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3359         return ret;
3360 }
3361 
3362 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3363 {
3364         __be32 *p;
3365 
3366         *res = 0;
3367         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3368                 return -EIO;
3369         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3370                 p = xdr_inline_decode(xdr, 4);
3371                 if (unlikely(!p))
3372                         return -EIO;
3373                 *res = be32_to_cpup(p);
3374                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3375         }
3376         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3377         return 0;
3378 }
3379 
3380 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3381 {
3382         __be32 *p;
3383 
3384         *res = 0;
3385         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3386                 return -EIO;
3387         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3388                 p = xdr_inline_decode(xdr, 4);
3389                 if (unlikely(!p))
3390                         return -EIO;
3391                 *res = be32_to_cpup(p);
3392                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3393         }
3394         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3395         return 0;
3396 }
3397 
3398 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3399 {
3400         __be32 *p;
3401         int ret = 0;
3402 
3403         fsid->major = 0;
3404         fsid->minor = 0;
3405         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3406                 return -EIO;
3407         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3408                 p = xdr_inline_decode(xdr, 16);
3409                 if (unlikely(!p))
3410                         return -EIO;
3411                 p = xdr_decode_hyper(p, &fsid->major);
3412                 xdr_decode_hyper(p, &fsid->minor);
3413                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3414                 ret = NFS_ATTR_FATTR_FSID;
3415         }
3416         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3417                         (unsigned long long)fsid->major,
3418                         (unsigned long long)fsid->minor);
3419         return ret;
3420 }
3421 
3422 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3423 {
3424         __be32 *p;
3425 
3426         *res = 60;
3427         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3428                 return -EIO;
3429         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3430                 p = xdr_inline_decode(xdr, 4);
3431                 if (unlikely(!p))
3432                         return -EIO;
3433                 *res = be32_to_cpup(p);
3434                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3435         }
3436         dprintk("%s: lease time=%u\n", __func__, (unsigned int)*res);
3437         return 0;
3438 }
3439 
3440 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3441 {
3442         __be32 *p;
3443 
3444         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3445                 return -EIO;
3446         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3447                 p = xdr_inline_decode(xdr, 4);
3448                 if (unlikely(!p))
3449                         return -EIO;
3450                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3451                 *res = -be32_to_cpup(p);
3452         }
3453         return 0;
3454 }
3455 
3456 static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
3457                                  uint32_t *bitmap, uint32_t *bitmask)
3458 {
3459         if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
3460                 int ret;
3461                 ret = decode_attr_bitmap(xdr, bitmask);
3462                 if (unlikely(ret < 0))
3463                         return ret;
3464                 bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3465         } else
3466                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3467         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3468                 bitmask[0], bitmask[1], bitmask[2]);
3469         return 0;
3470 }
3471 
3472 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3473 {
3474         __be32 *p;
3475         u32 len;
3476 
3477         if (fh != NULL)
3478                 memset(fh, 0, sizeof(*fh));
3479 
3480         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3481                 return -EIO;
3482         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3483                 p = xdr_inline_decode(xdr, 4);
3484                 if (unlikely(!p))
3485                         return -EIO;
3486                 len = be32_to_cpup(p);
3487                 if (len > NFS4_FHSIZE)
3488                         return -EIO;
3489                 p = xdr_inline_decode(xdr, len);
3490                 if (unlikely(!p))
3491                         return -EIO;
3492                 if (fh != NULL) {
3493                         memcpy(fh->data, p, len);
3494                         fh->size = len;
3495                 }
3496                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3497         }
3498         return 0;
3499 }
3500 
3501 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3502 {
3503         __be32 *p;
3504 
3505         *res = 0;
3506         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3507                 return -EIO;
3508         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3509                 p = xdr_inline_decode(xdr, 4);
3510                 if (unlikely(!p))
3511                         return -EIO;
3512                 *res = be32_to_cpup(p);
3513                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3514         }
3515         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3516         return 0;
3517 }
3518 
3519 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3520 {
3521         __be32 *p;
3522         int ret = 0;
3523 
3524         *fileid = 0;
3525         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3526                 return -EIO;
3527         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3528                 p = xdr_inline_decode(xdr, 8);
3529                 if (unlikely(!p))
3530                         return -EIO;
3531                 xdr_decode_hyper(p, fileid);
3532                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3533                 ret = NFS_ATTR_FATTR_FILEID;
3534         }
3535         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3536         return ret;
3537 }
3538 
3539 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3540 {
3541         __be32 *p;
3542         int ret = 0;
3543 
3544         *fileid = 0;
3545         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3546                 return -EIO;
3547         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3548                 p = xdr_inline_decode(xdr, 8);
3549                 if (unlikely(!p))
3550                         return -EIO;
3551                 xdr_decode_hyper(p, fileid);
3552                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3553                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3554         }
3555         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3556         return ret;
3557 }
3558 
3559 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3560 {
3561         __be32 *p;
3562         int status = 0;
3563 
3564         *res = 0;
3565         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3566                 return -EIO;
3567         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3568                 p = xdr_inline_decode(xdr, 8);
3569                 if (unlikely(!p))
3570                         return -EIO;
3571                 xdr_decode_hyper(p, res);
3572                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3573         }
3574         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3575         return status;
3576 }
3577 
3578 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3579 {
3580         __be32 *p;
3581         int status = 0;
3582 
3583         *res = 0;
3584         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3585                 return -EIO;
3586         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3587                 p = xdr_inline_decode(xdr, 8);
3588                 if (unlikely(!p))
3589                         return -EIO;
3590                 xdr_decode_hyper(p, res);
3591                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3592         }
3593         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3594         return status;
3595 }
3596 
3597 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3598 {
3599         __be32 *p;
3600         int status = 0;
3601 
3602         *res = 0;
3603         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3604                 return -EIO;
3605         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3606                 p = xdr_inline_decode(xdr, 8);
3607                 if (unlikely(!p))
3608                         return -EIO;
3609                 xdr_decode_hyper(p, res);
3610                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3611         }
3612         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3613         return status;
3614 }
3615 
3616 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3617 {
3618         u32 n;
3619         __be32 *p;
3620         int status = 0;
3621 
3622         p = xdr_inline_decode(xdr, 4);
3623         if (unlikely(!p))
3624                 return -EIO;
3625         n = be32_to_cpup(p);
3626         if (n == 0)
3627                 goto root_path;
3628         dprintk("pathname4: ");
3629         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3630                 dprintk("cannot parse %d components in path\n", n);
3631                 goto out_eio;
3632         }
3633         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3634                 struct nfs4_string *component = &path->components[path->ncomponents];
3635                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3636                 if (unlikely(status != 0))
3637                         goto out_eio;
3638                 ifdebug (XDR)
3639                         pr_cont("%s%.*s ",
3640                                 (path->ncomponents != n ? "/ " : ""),
3641                                 component->len, component->data);
3642         }
3643 out:
3644         return status;
3645 root_path:
3646 /* a root pathname is sent as a zero component4 */
3647         path->ncomponents = 1;
3648         path->components[0].len=0;
3649         path->components[0].data=NULL;
3650         dprintk("pathname4: /\n");
3651         goto out;
3652 out_eio:
3653         dprintk(" status %d", status);
3654         status = -EIO;
3655         goto out;
3656 }
3657 
3658 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3659 {
3660         int n;
3661         __be32 *p;
3662         int status = -EIO;
3663 
3664         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3665                 goto out;
3666         status = 0;
3667         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3668                 goto out;
3669         bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
3670         status = -EIO;
3671         /* Ignore borken servers that return unrequested attrs */
3672         if (unlikely(res == NULL))
3673                 goto out;
3674         dprintk("%s: fsroot:\n", __func__);
3675         status = decode_pathname(xdr, &res->fs_path);
3676         if (unlikely(status != 0))
3677                 goto out;
3678         p = xdr_inline_decode(xdr, 4);
3679         if (unlikely(!p))
3680                 goto out_eio;
3681         n = be32_to_cpup(p);
3682         if (n <= 0)
3683                 goto out_eio;
3684         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3685                 u32 m;
3686                 struct nfs4_fs_location *loc;
3687 
3688                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3689                         break;
3690                 loc = &res->locations[res->nlocations];
3691                 p = xdr_inline_decode(xdr, 4);
3692                 if (unlikely(!p))
3693                         goto out_eio;
3694                 m = be32_to_cpup(p);
3695 
3696                 dprintk("%s: servers:\n", __func__);
3697                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3698                         struct nfs4_string *server;
3699 
3700                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3701                                 unsigned int i;
3702                                 dprintk("%s: using first %u of %u servers "
3703                                         "returned for location %u\n",
3704                                                 __func__,
3705                                                 NFS4_FS_LOCATION_MAXSERVERS,
3706                                                 m, res->nlocations);
3707                                 for (i = loc->nservers; i < m; i++) {
3708                                         unsigned int len;
3709                                         char *data;
3710                                         status = decode_opaque_inline(xdr, &len, &data);
3711                                         if (unlikely(status != 0))
3712                                                 goto out_eio;
3713                                 }
3714                                 break;
3715                         }
3716                         server = &loc->servers[loc->nservers];
3717                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3718                         if (unlikely(status != 0))
3719                                 goto out_eio;
3720                         dprintk("%s ", server->data);
3721                 }
3722                 status = decode_pathname(xdr, &loc->rootpath);
3723                 if (unlikely(status != 0))
3724                         goto out_eio;
3725         }
3726         if (res->nlocations != 0)
3727                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3728 out:
3729         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3730         return status;
3731 out_eio:
3732         status = -EIO;
3733         goto out;
3734 }
3735 
3736 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3737 {
3738         __be32 *p;
3739         int status = 0;
3740 
3741         *res = 0;
3742         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3743                 return -EIO;
3744         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3745                 p = xdr_inline_decode(xdr, 8);
3746                 if (unlikely(!p))
3747                         return -EIO;
3748                 xdr_decode_hyper(p, res);
3749                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3750         }
3751         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3752         return status;
3753 }
3754 
3755 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3756 {
3757         __be32 *p;
3758         int status = 0;
3759 
3760         *maxlink = 1;
3761         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3762                 return -EIO;
3763         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3764                 p = xdr_inline_decode(xdr, 4);
3765                 if (unlikely(!p))
3766                         return -EIO;
3767                 *maxlink = be32_to_cpup(p);
3768                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3769         }
3770         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3771         return status;
3772 }
3773 
3774 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3775 {
3776         __be32 *p;
3777         int status = 0;
3778 
3779         *maxname = 1024;
3780         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3781                 return -EIO;
3782         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3783                 p = xdr_inline_decode(xdr, 4);
3784                 if (unlikely(!p))
3785                         return -EIO;
3786                 *maxname = be32_to_cpup(p);
3787                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3788         }
3789         dprintk("%s: maxname=%u\n", __func__, *maxname);
3790         return status;
3791 }
3792 
3793 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3794 {
3795         __be32 *p;
3796         int status = 0;
3797 
3798         *res = 1024;
3799         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3800                 return -EIO;
3801         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3802                 uint64_t maxread;
3803                 p = xdr_inline_decode(xdr, 8);
3804                 if (unlikely(!p))
3805                         return -EIO;
3806                 xdr_decode_hyper(p, &maxread);
3807                 if (maxread > 0x7FFFFFFF)
3808                         maxread = 0x7FFFFFFF;
3809                 *res = (uint32_t)maxread;
3810                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3811         }
3812         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3813         return status;
3814 }
3815 
3816 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3817 {
3818         __be32 *p;
3819         int status = 0;
3820 
3821         *res = 1024;
3822         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3823                 return -EIO;
3824         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3825                 uint64_t maxwrite;
3826                 p = xdr_inline_decode(xdr, 8);
3827                 if (unlikely(!p))
3828                         return -EIO;
3829                 xdr_decode_hyper(p, &maxwrite);
3830                 if (maxwrite > 0x7FFFFFFF)
3831                         maxwrite = 0x7FFFFFFF;
3832                 *res = (uint32_t)maxwrite;
3833                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3834         }
3835         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3836         return status;
3837 }
3838 
3839 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3840 {
3841         uint32_t tmp;
3842         __be32 *p;
3843         int ret = 0;
3844 
3845         *mode = 0;
3846         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3847                 return -EIO;
3848         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3849                 p = xdr_inline_decode(xdr, 4);
3850                 if (unlikely(!p))
3851                         return -EIO;
3852                 tmp = be32_to_cpup(p);
3853                 *mode = tmp & ~S_IFMT;
3854                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3855                 ret = NFS_ATTR_FATTR_MODE;
3856         }
3857         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3858         return ret;
3859 }
3860 
3861 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3862 {
3863         __be32 *p;
3864         int ret = 0;
3865 
3866         *nlink = 1;
3867         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3868                 return -EIO;
3869         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3870                 p = xdr_inline_decode(xdr, 4);
3871                 if (unlikely(!p))
3872                         return -EIO;
3873                 *nlink = be32_to_cpup(p);
3874                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3875                 ret = NFS_ATTR_FATTR_NLINK;
3876         }
3877         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3878         return ret;
3879 }
3880 
3881 static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
3882                 struct nfs4_string *name, gfp_t gfp_flags)
3883 {
3884         ssize_t ret;
3885 
3886         ret = xdr_stream_decode_string_dup(xdr, &name->data,
3887                         XDR_MAX_NETOBJ, gfp_flags);
3888         name->len = 0;
3889         if (ret > 0)
3890                 name->len = ret;
3891         return ret;
3892 }
3893 
3894 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3895                 const struct nfs_server *server, kuid_t *uid,
3896                 struct nfs4_string *owner_name)
3897 {
3898         ssize_t len;
3899         char *p;
3900 
3901         *uid = make_kuid(&init_user_ns, -2);
3902         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3903                 return -EIO;
3904         if (!(bitmap[1] & FATTR4_WORD1_OWNER))
3905                 return 0;
3906         bitmap[1] &= ~FATTR4_WORD1_OWNER;
3907 
3908         if (owner_name != NULL) {
3909                 len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
3910                 if (len <= 0)
3911                         goto out;
3912                 dprintk("%s: name=%s\n", __func__, owner_name->data);
3913                 return NFS_ATTR_FATTR_OWNER_NAME;
3914         } else {
3915                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3916                                 XDR_MAX_NETOBJ);
3917                 if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
3918                         goto out;
3919                 dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3920                 return NFS_ATTR_FATTR_OWNER;
3921         }
3922 out:
3923         if (len == -EBADMSG)
3924                 return -EIO;
3925         return 0;
3926 }
3927 
3928 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3929                 const struct nfs_server *server, kgid_t *gid,
3930                 struct nfs4_string *group_name)
3931 {
3932         ssize_t len;
3933         char *p;
3934 
3935         *gid = make_kgid(&init_user_ns, -2);
3936         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3937                 return -EIO;
3938         if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
3939                 return 0;
3940         bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3941 
3942         if (group_name != NULL) {
3943                 len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
3944                 if (len <= 0)
3945                         goto out;
3946                 dprintk("%s: name=%s\n", __func__, group_name->data);
3947                 return NFS_ATTR_FATTR_GROUP_NAME;
3948         } else {
3949                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3950                                 XDR_MAX_NETOBJ);
3951                 if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
3952                         goto out;
3953                 dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3954                 return NFS_ATTR_FATTR_GROUP;
3955         }
3956 out:
3957         if (len == -EBADMSG)
3958                 return -EIO;
3959         return 0;
3960 }
3961 
3962 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3963 {
3964         uint32_t major = 0, minor = 0;
3965         __be32 *p;
3966         int ret = 0;
3967 
3968         *rdev = MKDEV(0,0);
3969         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3970                 return -EIO;
3971         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3972                 dev_t tmp;
3973 
3974                 p = xdr_inline_decode(xdr, 8);
3975                 if (unlikely(!p))
3976                         return -EIO;
3977                 major = be32_to_cpup(p++);
3978                 minor = be32_to_cpup(p);
3979                 tmp = MKDEV(major, minor);
3980                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3981                         *rdev = tmp;
3982                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3983                 ret = NFS_ATTR_FATTR_RDEV;
3984         }
3985         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3986         return ret;
3987 }
3988 
3989 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3990 {
3991         __be32 *p;
3992         int status = 0;
3993 
3994         *res = 0;
3995         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3996                 return -EIO;
3997         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3998                 p = xdr_inline_decode(xdr, 8);
3999                 if (unlikely(!p))
4000                         return -EIO;
4001                 xdr_decode_hyper(p, res);
4002                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
4003         }
4004         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
4005         return status;
4006 }
4007 
4008 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4009 {
4010         __be32 *p;
4011         int status = 0;
4012 
4013         *res = 0;
4014         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
4015                 return -EIO;
4016         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
4017                 p = xdr_inline_decode(xdr, 8);
4018                 if (unlikely(!p))
4019                         return -EIO;
4020                 xdr_decode_hyper(p, res);
4021                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
4022         }
4023         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
4024         return status;
4025 }
4026 
4027 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4028 {
4029         __be32 *p;
4030         int status = 0;
4031 
4032         *res = 0;
4033         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4034                 return -EIO;
4035         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4036                 p = xdr_inline_decode(xdr, 8);
4037                 if (unlikely(!p))
4038                         return -EIO;
4039                 xdr_decode_hyper(p, res);
4040                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4041         }
4042         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4043         return status;
4044 }
4045 
4046 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4047 {
4048         __be32 *p;
4049         int ret = 0;
4050 
4051         *used = 0;
4052         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4053                 return -EIO;
4054         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4055                 p = xdr_inline_decode(xdr, 8);
4056                 if (unlikely(!p))
4057                         return -EIO;
4058                 xdr_decode_hyper(p, used);
4059                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4060                 ret = NFS_ATTR_FATTR_SPACE_USED;
4061         }
4062         dprintk("%s: space used=%Lu\n", __func__,
4063                         (unsigned long long)*used);
4064         return ret;
4065 }
4066 
4067 static __be32 *
4068 xdr_decode_nfstime4(__be32 *p, struct timespec *t)
4069 {
4070         __u64 sec;
4071 
4072         p = xdr_decode_hyper(p, &sec);
4073         t-> tv_sec = (time_t)sec;
4074         t->tv_nsec = be32_to_cpup(p++);
4075         return p;
4076 }
4077 
4078 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4079 {
4080         __be32 *p;
4081 
4082         p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
4083         if (unlikely(!p))
4084                 return -EIO;
4085         xdr_decode_nfstime4(p, time);
4086         return 0;
4087 }
4088 
4089 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4090 {
4091         int status = 0;
4092 
4093         time->tv_sec = 0;
4094         time->tv_nsec = 0;
4095         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4096                 return -EIO;
4097         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4098                 status = decode_attr_time(xdr, time);
4099                 if (status == 0)
4100                         status = NFS_ATTR_FATTR_ATIME;
4101                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4102         }
4103         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4104         return status;
4105 }
4106 
4107 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4108 {
4109         int status = 0;
4110 
4111         time->tv_sec = 0;
4112         time->tv_nsec = 0;
4113         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4114                 return -EIO;
4115         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4116                 status = decode_attr_time(xdr, time);
4117                 if (status == 0)
4118                         status = NFS_ATTR_FATTR_CTIME;
4119                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4120         }
4121         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4122         return status;
4123 }
4124 
4125 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4126                                   struct timespec *time)
4127 {
4128         int status = 0;
4129 
4130         time->tv_sec = 0;
4131         time->tv_nsec = 0;
4132         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4133                 return -EIO;
4134         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4135                 status = decode_attr_time(xdr, time);
4136                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4137         }
4138         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4139                 (long)time->tv_nsec);
4140         return status;
4141 }
4142 
4143 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4144                                         struct nfs4_label *label)
4145 {
4146         uint32_t pi = 0;
4147         uint32_t lfs = 0;
4148         __u32 len;
4149         __be32 *p;
4150         int status = 0;
4151 
4152         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4153                 return -EIO;
4154         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4155                 p = xdr_inline_decode(xdr, 4);
4156                 if (unlikely(!p))
4157                         return -EIO;
4158                 lfs = be32_to_cpup(p++);
4159                 p = xdr_inline_decode(xdr, 4);
4160                 if (unlikely(!p))
4161                         return -EIO;
4162                 pi = be32_to_cpup(p++);
4163                 p = xdr_inline_decode(xdr, 4);
4164                 if (unlikely(!p))
4165                         return -EIO;
4166                 len = be32_to_cpup(p++);
4167                 p = xdr_inline_decode(xdr, len);
4168                 if (unlikely(!p))
4169                         return -EIO;
4170                 if (len < NFS4_MAXLABELLEN) {
4171                         if (label) {
4172                                 memcpy(label->label, p, len);
4173                                 label->len = len;
4174                                 label->pi = pi;
4175                                 label->lfs = lfs;
4176                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4177                         }
4178                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4179                 } else
4180                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4181                                         __func__, len);
4182         }
4183         if (label && label->label)
4184                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4185                         (char *)label->label, label->len, label->pi, label->lfs);
4186         return status;
4187 }
4188 
4189 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4190 {
4191         int status = 0;
4192 
4193         time->tv_sec = 0;
4194         time->tv_nsec = 0;
4195         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4196                 return -EIO;
4197         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4198                 status = decode_attr_time(xdr, time);
4199                 if (status == 0)
4200                         status = NFS_ATTR_FATTR_MTIME;
4201                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4202         }
4203         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4204         return status;
4205 }
4206 
4207 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4208 {
4209         unsigned int attrwords = XDR_QUADLEN(attrlen);
4210         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4211 
4212         if (unlikely(attrwords != nwords)) {
4213                 dprintk("%s: server returned incorrect attribute length: "
4214                         "%u %c %u\n",
4215                                 __func__,
4216                                 attrwords << 2,
4217                                 (attrwords < nwords) ? '<' : '>',
4218                                 nwords << 2);
4219                 return -EIO;
4220         }
4221         return 0;
4222 }
4223 
4224 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4225 {
4226         __be32 *p;
4227 
4228         p = xdr_inline_decode(xdr, 20);
4229         if (unlikely(!p))
4230                 return -EIO;
4231         cinfo->atomic = be32_to_cpup(p++);
4232         p = xdr_decode_hyper(p, &cinfo->before);
4233         xdr_decode_hyper(p, &cinfo->after);
4234         return 0;
4235 }
4236 
4237 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4238 {
4239         __be32 *p;
4240         uint32_t supp, acc;
4241         int status;
4242 
4243         status = decode_op_hdr(xdr, OP_ACCESS);
4244         if (status)
4245                 return status;
4246         p = xdr_inline_decode(xdr, 8);
4247         if (unlikely(!p))
4248                 return -EIO;
4249         supp = be32_to_cpup(p++);
4250         acc = be32_to_cpup(p);
4251         *supported = supp;
4252         *access = acc;
4253         return 0;
4254 }
4255 
4256 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4257 {
4258         ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
4259         if (unlikely(ret < 0))
4260                 return -EIO;
4261         return 0;
4262 }
4263 
4264 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4265 {
4266         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4267 }
4268 
4269 static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4270 {
4271         stateid->type = NFS4_OPEN_STATEID_TYPE;
4272         return decode_stateid(xdr, stateid);
4273 }
4274 
4275 static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4276 {
4277         stateid->type = NFS4_LOCK_STATEID_TYPE;
4278         return decode_stateid(xdr, stateid);
4279 }
4280 
4281 static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4282 {
4283         stateid->type = NFS4_DELEGATION_STATEID_TYPE;
4284         return decode_stateid(xdr, stateid);
4285 }
4286 
4287 static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4288 {
4289         nfs4_stateid dummy;
4290 
4291         nfs4_stateid_copy(stateid, &invalid_stateid);
4292         return decode_stateid(xdr, &dummy);
4293 }
4294 
4295 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4296 {
4297         int status;
4298 
4299         status = decode_op_hdr(xdr, OP_CLOSE);
4300         if (status != -EIO)
4301                 nfs_increment_open_seqid(status, res->seqid);
4302         if (!status)
4303                 status = decode_invalid_stateid(xdr, &res->stateid);
4304         return status;
4305 }
4306 
4307 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4308 {
4309         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4310 }
4311 
4312 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4313 {
4314         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4315 }
4316 
4317 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4318 {
4319         int status;
4320 
4321         status = decode_op_hdr(xdr, OP_COMMIT);
4322         if (!status)
4323                 status = decode_write_verifier(xdr, &res->verf->verifier);
4324         return status;
4325 }
4326 
4327 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4328 {
4329         __be32 *p;
4330         uint32_t bmlen;
4331         int status;
4332 
4333         status = decode_op_hdr(xdr, OP_CREATE);
4334         if (status)
4335                 return status;
4336         if ((status = decode_change_info(xdr, cinfo)))
4337                 return status;
4338         p = xdr_inline_decode(xdr, 4);
4339         if (unlikely(!p))
4340                 return -EIO;
4341         bmlen = be32_to_cpup(p);
4342         p = xdr_inline_decode(xdr, bmlen << 2);
4343         if (likely(p))
4344                 return 0;
4345         return -EIO;
4346 }
4347 
4348 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4349 {
4350         unsigned int savep;
4351         uint32_t attrlen, bitmap[3] = {0};
4352         int status;
4353 
4354         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4355                 goto xdr_error;
4356         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4357                 goto xdr_error;
4358         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4359                 goto xdr_error;
4360         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4361                 goto xdr_error;
4362         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4363                                                  &res->fh_expire_type)) != 0)
4364                 goto xdr_error;
4365         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4366                 goto xdr_error;
4367         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4368                 goto xdr_error;
4369         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4370                 goto xdr_error;
4371         if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
4372                                 res->exclcreat_bitmask)) != 0)
4373                 goto xdr_error;
4374         status = verify_attr_len(xdr, savep, attrlen);
4375 xdr_error:
4376         dprintk("%s: xdr returned %d!\n", __func__, -status);
4377         return status;
4378 }
4379 
4380 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4381 {
4382         unsigned int savep;
4383         uint32_t attrlen, bitmap[3] = {0};
4384         int status;
4385 
4386         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4387                 goto xdr_error;
4388         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4389                 goto xdr_error;
4390         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4391                 goto xdr_error;
4392 
4393         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4394                 goto xdr_error;
4395         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4396                 goto xdr_error;
4397         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4398                 goto xdr_error;
4399 
4400         status = -EIO;
4401         if (unlikely(bitmap[0]))
4402                 goto xdr_error;
4403 
4404         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4405                 goto xdr_error;
4406         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4407                 goto xdr_error;
4408         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4409                 goto xdr_error;
4410 
4411         status = verify_attr_len(xdr, savep, attrlen);
4412 xdr_error:
4413         dprintk("%s: xdr returned %d!\n", __func__, -status);
4414         return status;
4415 }
4416 
4417 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4418 {
4419         unsigned int savep;
4420         uint32_t attrlen, bitmap[3] = {0};
4421         int status;
4422 
4423         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4424                 goto xdr_error;
4425         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4426                 goto xdr_error;
4427         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4428                 goto xdr_error;
4429 
4430         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4431                 goto xdr_error;
4432         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4433                 goto xdr_error;
4434 
4435         status = verify_attr_len(xdr, savep, attrlen);
4436 xdr_error:
4437         dprintk("%s: xdr returned %d!\n", __func__, -status);
4438         return status;
4439 }
4440 
4441 static int decode_threshold_hint(struct xdr_stream *xdr,
4442                                   uint32_t *bitmap,
4443                                   uint64_t *res,
4444                                   uint32_t hint_bit)
4445 {
4446         __be32 *p;
4447 
4448         *res = 0;
4449         if (likely(bitmap[0] & hint_bit)) {
4450                 p = xdr_inline_decode(xdr, 8);
4451                 if (unlikely(!p))
4452                         return -EIO;
4453                 xdr_decode_hyper(p, res);
4454         }
4455         return 0;
4456 }
4457 
4458 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4459                                         struct nfs4_threshold *res)
4460 {
4461         __be32 *p;
4462         unsigned int savep;
4463         uint32_t bitmap[3] = {0,}, attrlen;
4464         int status;
4465 
4466         /* layout type */
4467         p = xdr_inline_decode(xdr, 4);
4468         if (unlikely(!p))
4469                 return -EIO;
4470         res->l_type = be32_to_cpup(p);
4471 
4472         /* thi_hintset bitmap */
4473         status = decode_attr_bitmap(xdr, bitmap);
4474         if (status < 0)
4475                 goto xdr_error;
4476 
4477         /* thi_hintlist length */
4478         status = decode_attr_length(xdr, &attrlen, &savep);
4479         if (status < 0)
4480                 goto xdr_error;
4481         /* thi_hintlist */
4482         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4483         if (status < 0)
4484                 goto xdr_error;
4485         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4486         if (status < 0)
4487                 goto xdr_error;
4488         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4489                                        THRESHOLD_RD_IO);
4490         if (status < 0)
4491                 goto xdr_error;
4492         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4493                                        THRESHOLD_WR_IO);
4494         if (status < 0)
4495                 goto xdr_error;
4496 
4497         status = verify_attr_len(xdr, savep, attrlen);
4498         res->bm = bitmap[0];
4499 
4500         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4501                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4502                 res->wr_io_sz);
4503 xdr_error:
4504         dprintk("%s ret=%d!\n", __func__, status);
4505         return status;
4506 }
4507 
4508 /*
4509  * Thresholds on pNFS direct I/O vrs MDS I/O
4510  */
4511 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4512                                     uint32_t *bitmap,
4513                                     struct nfs4_threshold *res)
4514 {
4515         __be32 *p;
4516         int status = 0;
4517         uint32_t num;
4518 
4519         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4520                 return -EIO;
4521         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4522                 /* Did the server return an unrequested attribute? */
4523                 if (unlikely(res == NULL))
4524                         return -EREMOTEIO;
4525                 p = xdr_inline_decode(xdr, 4);
4526                 if (unlikely(!p))
4527                         return -EIO;
4528                 num = be32_to_cpup(p);
4529                 if (num == 0)
4530                         return 0;
4531                 if (num > 1)
4532                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4533                                 "drivers per filesystem not supported\n",
4534                                 __func__);
4535 
4536                 status = decode_first_threshold_item4(xdr, res);
4537                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4538         }
4539         return status;
4540 }
4541 
4542 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4543                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4544                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4545                 const struct nfs_server *server)
4546 {
4547         int status;
4548         umode_t fmode = 0;
4549         uint32_t type;
4550         int32_t err;
4551 
4552         status = decode_attr_type(xdr, bitmap, &type);
4553         if (status < 0)
4554                 goto xdr_error;
4555         fattr->mode = 0;
4556         if (status != 0) {
4557                 fattr->mode |= nfs_type2fmt[type];
4558                 fattr->valid |= status;
4559         }
4560 
4561         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4562         if (status < 0)
4563                 goto xdr_error;
4564         fattr->valid |= status;
4565 
4566         status = decode_attr_size(xdr, bitmap, &fattr->size);
4567         if (status < 0)
4568                 goto xdr_error;
4569         fattr->valid |= status;
4570 
4571         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4572         if (status < 0)
4573                 goto xdr_error;
4574         fattr->valid |= status;
4575 
4576         err = 0;
4577         status = decode_attr_error(xdr, bitmap, &err);
4578         if (status < 0)
4579                 goto xdr_error;
4580 
4581         status = decode_attr_filehandle(xdr, bitmap, fh);
4582         if (status < 0)
4583                 goto xdr_error;
4584 
4585         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4586         if (status < 0)
4587                 goto xdr_error;
4588         fattr->valid |= status;
4589 
4590         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4591         if (status < 0)
4592                 goto xdr_error;
4593         fattr->valid |= status;
4594 
4595         status = -EIO;
4596         if (unlikely(bitmap[0]))
4597                 goto xdr_error;
4598 
4599         status = decode_attr_mode(xdr, bitmap, &fmode);
4600         if (status < 0)
4601                 goto xdr_error;
4602         if (status != 0) {
4603                 fattr->mode |= fmode;
4604                 fattr->valid |= status;
4605         }
4606 
4607         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4608         if (status < 0)
4609                 goto xdr_error;
4610         fattr->valid |= status;
4611 
4612         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4613         if (status < 0)
4614                 goto xdr_error;
4615         fattr->valid |= status;
4616 
4617         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4618         if (status < 0)
4619                 goto xdr_error;
4620         fattr->valid |= status;
4621 
4622         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4623         if (status < 0)
4624                 goto xdr_error;
4625         fattr->valid |= status;
4626 
4627         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4628         if (status < 0)
4629                 goto xdr_error;
4630         fattr->valid |= status;
4631 
4632         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4633         if (status < 0)
4634                 goto xdr_error;
4635         fattr->valid |= status;
4636 
4637         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4638         if (status < 0)
4639                 goto xdr_error;
4640         fattr->valid |= status;
4641 
4642         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4643         if (status < 0)
4644                 goto xdr_error;
4645         fattr->valid |= status;
4646 
4647         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4648         if (status < 0)
4649                 goto xdr_error;
4650         fattr->valid |= status;
4651 
4652         status = -EIO;
4653         if (unlikely(bitmap[1]))
4654                 goto xdr_error;
4655 
4656         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4657         if (status < 0)
4658                 goto xdr_error;
4659 
4660         if (label) {
4661                 status = decode_attr_security_label(xdr, bitmap, label);
4662                 if (status < 0)
4663                         goto xdr_error;
4664                 fattr->valid |= status;
4665         }
4666 
4667 xdr_error:
4668         dprintk("%s: xdr returned %d\n", __func__, -status);
4669         return status;
4670 }
4671 
4672 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4673                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4674                 struct nfs4_label *label, const struct nfs_server *server)
4675 {
4676         unsigned int savep;
4677         uint32_t attrlen,
4678                  bitmap[3] = {0};
4679         int status;
4680 
4681         status = decode_op_hdr(xdr, OP_GETATTR);
4682         if (status < 0)
4683                 goto xdr_error;
4684 
4685         status = decode_attr_bitmap(xdr, bitmap);
4686         if (status < 0)
4687                 goto xdr_error;
4688 
4689         status = decode_attr_length(xdr, &attrlen, &savep);
4690         if (status < 0)
4691                 goto xdr_error;
4692 
4693         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4694                                         label, server);
4695         if (status < 0)
4696                 goto xdr_error;
4697 
4698         status = verify_attr_len(xdr, savep, attrlen);
4699 xdr_error:
4700         dprintk("%s: xdr returned %d\n", __func__, -status);
4701         return status;
4702 }
4703 
4704 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4705                 struct nfs4_label *label, const struct nfs_server *server)
4706 {
4707         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4708 }
4709 
4710 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4711                 const struct nfs_server *server)
4712 {
4713         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4714 }
4715 
4716 /*
4717  * Decode potentially multiple layout types.
4718  */
4719 static int decode_pnfs_layout_types(struct xdr_stream *xdr,
4720                                     struct nfs_fsinfo *fsinfo)
4721 {
4722         __be32 *p;
4723         uint32_t i;
4724 
4725         p = xdr_inline_decode(xdr, 4);
4726         if (unlikely(!p))
4727                 return -EIO;
4728         fsinfo->nlayouttypes = be32_to_cpup(p);
4729 
4730         /* pNFS is not supported by the underlying file system */
4731         if (fsinfo->nlayouttypes == 0)
4732                 return 0;
4733 
4734         /* Decode and set first layout type, move xdr->p past unused types */
4735         p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
4736         if (unlikely(!p))
4737                 return -EIO;
4738 
4739         /* If we get too many, then just cap it at the max */
4740         if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
4741                 printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
4742                         __func__, fsinfo->nlayouttypes);
4743                 fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
4744         }
4745 
4746         for(i = 0; i < fsinfo->nlayouttypes; ++i)
4747                 fsinfo->layouttype[i] = be32_to_cpup(p++);
4748         return 0;
4749 }
4750 
4751 /*
4752  * The type of file system exported.
4753  * Note we must ensure that layouttype is set in any non-error case.
4754  */
4755 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4756                                 struct nfs_fsinfo *fsinfo)
4757 {
4758         int status = 0;
4759 
4760         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4761         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4762                 return -EIO;
4763         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4764                 status = decode_pnfs_layout_types(xdr, fsinfo);
4765                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4766         }
4767         return status;
4768 }
4769 
4770 /*
4771  * The prefered block size for layout directed io
4772  */
4773 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4774                                       uint32_t *res)
4775 {
4776         __be32 *p;
4777 
4778         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4779         *res = 0;
4780         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4781                 p = xdr_inline_decode(xdr, 4);
4782                 if (unlikely(!p))
4783                         return -EIO;
4784                 *res = be32_to_cpup(p);
4785                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4786         }
4787         return 0;
4788 }
4789 
4790 /*
4791  * The granularity of a CLONE operation.
4792  */
4793 static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4794                                      uint32_t *res)
4795 {
4796         __be32 *p;
4797 
4798         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4799         *res = 0;
4800         if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
4801                 p = xdr_inline_decode(xdr, 4);
4802                 if (unlikely(!p))
4803                         return -EIO;
4804                 *res = be32_to_cpup(p);
4805                 bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
4806         }
4807         return 0;
4808 }
4809 
4810 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4811 {
4812         unsigned int savep;
4813         uint32_t attrlen, bitmap[3];
4814         int status;
4815 
4816         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4817                 goto xdr_error;
4818         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4819                 goto xdr_error;
4820         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4821                 goto xdr_error;
4822 
4823         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4824 
4825         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4826                 goto xdr_error;
4827         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4828                 goto xdr_error;
4829         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4830                 goto xdr_error;
4831         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4832         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4833                 goto xdr_error;
4834         fsinfo->wtpref = fsinfo->wtmax;
4835 
4836         status = -EIO;
4837         if (unlikely(bitmap[0]))
4838                 goto xdr_error;
4839 
4840         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4841         if (status != 0)
4842                 goto xdr_error;
4843         status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
4844         if (status != 0)
4845                 goto xdr_error;
4846 
4847         status = -EIO;
4848         if (unlikely(bitmap[1]))
4849                 goto xdr_error;
4850 
4851         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4852         if (status)
4853                 goto xdr_error;
4854         status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
4855         if (status)
4856                 goto xdr_error;
4857 
4858         status = verify_attr_len(xdr, savep, attrlen);
4859 xdr_error:
4860         dprintk("%s: xdr returned %d!\n", __func__, -status);
4861         return status;
4862 }
4863 
4864 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4865 {
4866         __be32 *p;
4867         uint32_t len;
4868         int status;
4869 
4870         /* Zero handle first to allow comparisons */
4871         memset(fh, 0, sizeof(*fh));
4872 
4873         status = decode_op_hdr(xdr, OP_GETFH);
4874         if (status)
4875                 return status;
4876 
4877         p = xdr_inline_decode(xdr, 4);
4878         if (unlikely(!p))
4879                 return -EIO;
4880         len = be32_to_cpup(p);
4881         if (len > NFS4_FHSIZE)
4882                 return -EIO;
4883         fh->size = len;
4884         p = xdr_inline_decode(xdr, len);
4885         if (unlikely(!p))
4886                 return -EIO;
4887         memcpy(fh->data, p, len);
4888         return 0;
4889 }
4890 
4891 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4892 {
4893         int status;
4894 
4895         status = decode_op_hdr(xdr, OP_LINK);
4896         if (status)
4897                 return status;
4898         return decode_change_info(xdr, cinfo);
4899 }
4900 
4901 /*
4902  * We create the owner, so we know a proper owner.id length is 4.
4903  */
4904 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4905 {
4906         uint64_t offset, length, clientid;
4907         __be32 *p;
4908         uint32_t namelen, type;
4909 
4910         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4911         if (unlikely(!p))
4912                 return -EIO;
4913         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4914         p = xdr_decode_hyper(p, &length);
4915         type = be32_to_cpup(p++); /* 4 byte read */
4916         if (fl != NULL) { /* manipulate file lock */
4917                 fl->fl_start = (loff_t)offset;
4918                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4919                 if (length == ~(uint64_t)0)
4920                         fl->fl_end = OFFSET_MAX;
4921                 fl->fl_type = F_WRLCK;
4922                 if (type & 1)
4923                         fl->fl_type = F_RDLCK;
4924                 fl->fl_pid = 0;
4925         }
4926         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4927         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4928         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4929         if (likely(!p))
4930                 return -EIO;
4931         return -NFS4ERR_DENIED;
4932 }
4933 
4934 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4935 {
4936         int status;
4937 
4938         status = decode_op_hdr(xdr, OP_LOCK);
4939         if (status == -EIO)
4940                 goto out;
4941         if (status == 0) {
4942                 status = decode_lock_stateid(xdr, &res->stateid);
4943                 if (unlikely(status))
4944                         goto out;
4945         } else if (status == -NFS4ERR_DENIED)
4946                 status = decode_lock_denied(xdr, NULL);
4947         if (res->open_seqid != NULL)
4948                 nfs_increment_open_seqid(status, res->open_seqid);
4949         nfs_increment_lock_seqid(status, res->lock_seqid);
4950 out:
4951         return status;
4952 }
4953 
4954 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4955 {
4956         int status;
4957         status = decode_op_hdr(xdr, OP_LOCKT);
4958         if (status == -NFS4ERR_DENIED)
4959                 return decode_lock_denied(xdr, res->denied);
4960         return status;
4961 }
4962 
4963 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4964 {
4965         int status;
4966 
4967         status = decode_op_hdr(xdr, OP_LOCKU);
4968         if (status != -EIO)
4969                 nfs_increment_lock_seqid(status, res->seqid);
4970         if (status == 0)
4971                 status = decode_lock_stateid(xdr, &res->stateid);
4972         return status;
4973 }
4974 
4975 static int decode_release_lockowner(struct xdr_stream *xdr)
4976 {
4977         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4978 }
4979 
4980 static int decode_lookup(struct xdr_stream *xdr)
4981 {
4982         return decode_op_hdr(xdr, OP_LOOKUP);
4983 }
4984 
4985 static int decode_lookupp(struct xdr_stream *xdr)
4986 {
4987         return decode_op_hdr(xdr, OP_LOOKUPP);
4988 }
4989 
4990 /* This is too sick! */
4991 static int decode_space_limit(struct xdr_stream *xdr,
4992                 unsigned long *pagemod_limit)
4993 {
4994         __be32 *p;
4995         uint32_t limit_type, nblocks, blocksize;
4996         u64 maxsize = 0;
4997 
4998         p = xdr_inline_decode(xdr, 12);
4999         if (unlikely(!p))
5000                 return -EIO;
5001         limit_type = be32_to_cpup(p++);
5002         switch (limit_type) {
5003         case NFS4_LIMIT_SIZE:
5004                 xdr_decode_hyper(p, &maxsize);
5005                 break;
5006         case NFS4_LIMIT_BLOCKS:
5007                 nblocks = be32_to_cpup(p++);
5008                 blocksize = be32_to_cpup(p);
5009                 maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
5010         }
5011         maxsize >>= PAGE_SHIFT;
5012         *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
5013         return 0;
5014 }
5015 
5016 static int decode_rw_delegation(struct xdr_stream *xdr,
5017                 uint32_t delegation_type,
5018                 struct nfs_openres *res)
5019 {
5020         __be32 *p;
5021         int status;
5022 
5023         status = decode_delegation_stateid(xdr, &res->delegation);
5024         if (unlikely(status))
5025                 return status;
5026         p = xdr_inline_decode(xdr, 4);
5027         if (unlikely(!p))
5028                 return -EIO;
5029         res->do_recall = be32_to_cpup(p);
5030 
5031         switch (delegation_type) {
5032         case NFS4_OPEN_DELEGATE_READ:
5033                 res->delegation_type = FMODE_READ;
5034                 break;
5035         case NFS4_OPEN_DELEGATE_WRITE:
5036                 res->delegation_type = FMODE_WRITE|FMODE_READ;
5037                 if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
5038                                 return -EIO;
5039         }
5040         return decode_ace(xdr, NULL);
5041 }
5042 
5043 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5044 {
5045         __be32 *p;
5046         uint32_t why_no_delegation;
5047 
5048         p = xdr_inline_decode(xdr, 4);
5049         if (unlikely(!p))
5050                 return -EIO;
5051         why_no_delegation = be32_to_cpup(p);
5052         switch (why_no_delegation) {
5053                 case WND4_CONTENTION:
5054                 case WND4_RESOURCE:
5055                         xdr_inline_decode(xdr, 4);
5056                         /* Ignore for now */
5057         }
5058         return 0;
5059 }
5060 
5061 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5062 {
5063         __be32 *p;
5064         uint32_t delegation_type;
5065 
5066         p = xdr_inline_decode(xdr, 4);
5067         if (unlikely(!p))
5068                 return -EIO;
5069         delegation_type = be32_to_cpup(p);
5070         res->delegation_type = 0;
5071         switch (delegation_type) {
5072         case NFS4_OPEN_DELEGATE_NONE:
5073                 return 0;
5074         case NFS4_OPEN_DELEGATE_READ:
5075         case NFS4_OPEN_DELEGATE_WRITE:
5076                 return decode_rw_delegation(xdr, delegation_type, res);
5077         case NFS4_OPEN_DELEGATE_NONE_EXT:
5078                 return decode_no_delegation(xdr, res);
5079         }
5080         return -EIO;
5081 }
5082 
5083 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5084 {
5085         __be32 *p;
5086         uint32_t savewords, bmlen, i;
5087         int status;
5088 
5089         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5090                 return status;
5091         nfs_increment_open_seqid(status, res->seqid);
5092         if (status)
5093                 return status;
5094         status = decode_open_stateid(xdr, &res->stateid);
5095         if (unlikely(status))
5096                 return status;
5097 
5098         decode_change_info(xdr, &res->cinfo);
5099 
5100         p = xdr_inline_decode(xdr, 8);
5101         if (unlikely(!p))
5102                 return -EIO;
5103         res->rflags = be32_to_cpup(p++);
5104         bmlen = be32_to_cpup(p);
5105         if (bmlen > 10)
5106                 goto xdr_error;
5107 
5108         p = xdr_inline_decode(xdr, bmlen << 2);
5109         if (unlikely(!p))
5110                 return -EIO;
5111         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5112         for (i = 0; i < savewords; ++i)
5113                 res->attrset[i] = be32_to_cpup(p++);
5114         for (; i < NFS4_BITMAP_SIZE; i++)
5115                 res->attrset[i] = 0;
5116 
5117         return decode_delegation(xdr, res);
5118 xdr_error:
5119         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5120         return -EIO;
5121 }
5122 
5123 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5124 {
5125         int status;
5126 
5127         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5128         if (status != -EIO)
5129                 nfs_increment_open_seqid(status, res->seqid);
5130         if (!status)
5131                 status = decode_open_stateid(xdr, &res->stateid);
5132         return status;
5133 }
5134 
5135 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5136 {
5137         int status;
5138 
5139         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5140         if (status != -EIO)
5141                 nfs_increment_open_seqid(status, res->seqid);
5142         if (!status)
5143                 status = decode_open_stateid(xdr, &res->stateid);
5144         return status;
5145 }
5146 
5147 static int decode_putfh(struct xdr_stream *xdr)
5148 {
5149         return decode_op_hdr(xdr, OP_PUTFH);
5150 }
5151 
5152 static int decode_putrootfh(struct xdr_stream *xdr)
5153 {
5154         return decode_op_hdr(xdr, OP_PUTROOTFH);
5155 }
5156 
5157 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5158                        struct nfs_pgio_res *res)
5159 {
5160         __be32 *p;
5161         uint32_t count, eof, recvd;
5162         int status;
5163 
5164         status = decode_op_hdr(xdr, OP_READ);
5165         if (status)
5166                 return status;
5167         p = xdr_inline_decode(xdr, 8);
5168         if (unlikely(!p))
5169                 return -EIO;
5170         eof = be32_to_cpup(p++);
5171         count = be32_to_cpup(p);
5172         recvd = xdr_read_pages(xdr, count);
5173         if (count > recvd) {
5174                 dprintk("NFS: server cheating in read reply: "
5175                                 "count %u > recvd %u\n", count, recvd);
5176                 count = recvd;
5177                 eof = 0;
5178         }
5179         res->eof = eof;
5180         res->count = count;
5181         return 0;
5182 }
5183 
5184 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5185 {
5186         int             status;
5187         __be32          verf[2];
5188 
5189         status = decode_op_hdr(xdr, OP_READDIR);
5190         if (!status)
5191                 status = decode_verifier(xdr, readdir->verifier.data);
5192         if (unlikely(status))
5193                 return status;
5194         memcpy(verf, readdir->verifier.data, sizeof(verf));
5195         dprintk("%s: verifier = %08x:%08x\n",
5196                         __func__, verf[0], verf[1]);
5197         return xdr_read_pages(xdr, xdr->buf->page_len);
5198 }
5199 
5200 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5201 {
5202         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5203         u32 len, recvd;
5204         __be32 *p;
5205         int status;
5206 
5207         status = decode_op_hdr(xdr, OP_READLINK);
5208         if (status)
5209                 return status;
5210 
5211         /* Convert length of symlink */
5212         p = xdr_inline_decode(xdr, 4);
5213         if (unlikely(!p))
5214                 return -EIO;
5215         len = be32_to_cpup(p);
5216         if (len >= rcvbuf->page_len || len <= 0) {
5217                 dprintk("nfs: server returned giant symlink!\n");
5218                 return -ENAMETOOLONG;
5219         }
5220         recvd = xdr_read_pages(xdr, len);
5221         if (recvd < len) {
5222                 dprintk("NFS: server cheating in readlink reply: "
5223                                 "count %u > recvd %u\n", len, recvd);
5224                 return -EIO;
5225         }
5226         /*
5227          * The XDR encode routine has set things up so that
5228          * the link text will be copied directly into the
5229          * buffer.  We just have to do overflow-checking,
5230          * and and null-terminate the text (the VFS expects
5231          * null-termination).
5232          */
5233         xdr_terminate_string(rcvbuf, len);
5234         return 0;
5235 }
5236 
5237 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5238 {
5239         int status;
5240 
5241         status = decode_op_hdr(xdr, OP_REMOVE);
5242         if (status)
5243                 goto out;
5244         status = decode_change_info(xdr, cinfo);
5245 out:
5246         return status;
5247 }
5248 
5249 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5250               struct nfs4_change_info *new_cinfo)
5251 {
5252         int status;
5253 
5254         status = decode_op_hdr(xdr, OP_RENAME);
5255         if (status)
5256                 goto out;
5257         if ((status = decode_change_info(xdr, old_cinfo)))
5258                 goto out;
5259         status = decode_change_info(xdr, new_cinfo);
5260 out:
5261         return status;
5262 }
5263 
5264 static int decode_renew(struct xdr_stream *xdr)
5265 {
5266         return decode_op_hdr(xdr, OP_RENEW);
5267 }
5268 
5269 static int
5270 decode_restorefh(struct xdr_stream *xdr)
5271 {
5272         return decode_op_hdr(xdr, OP_RESTOREFH);
5273 }
5274 
5275 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5276                          struct nfs_getaclres *res)
5277 {
5278         unsigned int savep;
5279         uint32_t attrlen,
5280                  bitmap[3] = {0};
5281         int status;
5282         unsigned int pg_offset;
5283 
5284         res->acl_len = 0;
5285         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5286                 goto out;
5287 
5288         xdr_enter_page(xdr, xdr->buf->page_len);
5289 
5290         /* Calculate the offset of the page data */
5291         pg_offset = xdr->buf->head[0].iov_len;
5292 
5293         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5294                 goto out;
5295         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5296                 goto out;
5297 
5298         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5299                 return -EIO;
5300         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5301 
5302                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5303                  * are stored with the acl data to handle the problem of
5304                  * variable length bitmaps.*/
5305                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5306                 res->acl_len = attrlen;
5307 
5308                 /* Check for receive buffer overflow */
5309                 if (res->acl_len > (xdr->nwords << 2) ||
5310                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5311                         res->acl_flags |= NFS4_ACL_TRUNC;
5312                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5313                                         attrlen, xdr->nwords << 2);
5314                 }
5315         } else
5316                 status = -EOPNOTSUPP;
5317 
5318 out:
5319         return status;
5320 }
5321 
5322 static int
5323 decode_savefh(struct xdr_stream *xdr)
5324 {
5325         return decode_op_hdr(xdr, OP_SAVEFH);
5326 }
5327 
5328 static int decode_setattr(struct xdr_stream *xdr)
5329 {
5330         int status;
5331 
5332         status = decode_op_hdr(xdr, OP_SETATTR);
5333         if (status)
5334                 return status;
5335         if (decode_bitmap4(xdr, NULL, 0) >= 0)
5336                 return 0;
5337         return -EIO;
5338 }
5339 
5340 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5341 {
5342         __be32 *p;
5343         uint32_t opnum;
5344         int32_t nfserr;
5345 
5346         p = xdr_inline_decode(xdr, 8);
5347         if (unlikely(!p))
5348                 return -EIO;
5349         opnum = be32_to_cpup(p++);
5350         if (opnum != OP_SETCLIENTID) {
5351                 dprintk("nfs: decode_setclientid: Server returned operation"
5352                         " %d\n", opnum);
5353                 return -EIO;
5354         }
5355         nfserr = be32_to_cpup(p);
5356         if (nfserr == NFS_OK) {
5357                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5358                 if (unlikely(!p))
5359                         return -EIO;
5360                 p = xdr_decode_hyper(p, &res->clientid);
5361                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5362         } else if (nfserr == NFSERR_CLID_INUSE) {
5363                 uint32_t len;
5364 
5365                 /* skip netid string */
5366                 p = xdr_inline_decode(xdr, 4);
5367                 if (unlikely(!p))
5368                         return -EIO;
5369                 len = be32_to_cpup(p);
5370                 p = xdr_inline_decode(xdr, len);
5371                 if (unlikely(!p))
5372                         return -EIO;
5373 
5374                 /* skip uaddr string */
5375                 p = xdr_inline_decode(xdr, 4);
5376                 if (unlikely(!p))
5377                         return -EIO;
5378                 len = be32_to_cpup(p);
5379                 p = xdr_inline_decode(xdr, len);
5380                 if (unlikely(!p))
5381                         return -EIO;
5382                 return -NFSERR_CLID_INUSE;
5383         } else
5384                 return nfs4_stat_to_errno(nfserr);
5385 
5386         return 0;
5387 }
5388 
5389 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5390 {
5391         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5392 }
5393 
5394 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5395 {
5396         __be32 *p;
5397         int status;
5398 
5399         status = decode_op_hdr(xdr, OP_WRITE);
5400         if (status)
5401                 return status;
5402 
5403         p = xdr_inline_decode(xdr, 8);
5404         if (unlikely(!p))
5405                 return -EIO;
5406         res->count = be32_to_cpup(p++);
5407         res->verf->committed = be32_to_cpup(p++);
5408         return decode_write_verifier(xdr, &res->verf->verifier);
5409 }
5410 
5411 static int decode_delegreturn(struct xdr_stream *xdr)
5412 {
5413         return decode_op_hdr(xdr, OP_DELEGRETURN);
5414 }
5415 
5416 static int decode_secinfo_gss(struct xdr_stream *xdr,
5417                               struct nfs4_secinfo4 *flavor)
5418 {
5419         u32 oid_len;
5420         __be32 *p;
5421 
5422         p = xdr_inline_decode(xdr, 4);
5423         if (unlikely(!p))
5424                 return -EIO;
5425         oid_len = be32_to_cpup(p);
5426         if (oid_len > GSS_OID_MAX_LEN)
5427                 return -EINVAL;
5428 
5429         p = xdr_inline_decode(xdr, oid_len);
5430         if (unlikely(!p))
5431                 return -EIO;
5432         memcpy(flavor->flavor_info.oid.data,