~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
841                                          encode_sequence_maxsz + \
842                                          encode_putrootfh_maxsz + \
843                                          encode_fsinfo_maxsz)
844 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
845                                          decode_sequence_maxsz + \
846                                          decode_putrootfh_maxsz + \
847                                          decode_fsinfo_maxsz)
848 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
849                                          encode_sequence_maxsz + \
850                                          encode_reclaim_complete_maxsz)
851 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
852                                          decode_sequence_maxsz + \
853                                          decode_reclaim_complete_maxsz)
854 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
855                                 encode_sequence_maxsz +\
856                                 encode_getdeviceinfo_maxsz)
857 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
858                                 decode_sequence_maxsz + \
859                                 decode_getdeviceinfo_maxsz)
860 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
861                                 encode_sequence_maxsz + \
862                                 encode_putfh_maxsz +        \
863                                 encode_layoutget_maxsz)
864 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
865                                 decode_sequence_maxsz + \
866                                 decode_putfh_maxsz +        \
867                                 decode_layoutget_maxsz)
868 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
869                                 encode_sequence_maxsz +\
870                                 encode_putfh_maxsz + \
871                                 encode_layoutcommit_maxsz + \
872                                 encode_getattr_maxsz)
873 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
874                                 decode_sequence_maxsz + \
875                                 decode_putfh_maxsz + \
876                                 decode_layoutcommit_maxsz + \
877                                 decode_getattr_maxsz)
878 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
879                                 encode_sequence_maxsz + \
880                                 encode_putfh_maxsz + \
881                                 encode_layoutreturn_maxsz)
882 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
883                                 decode_sequence_maxsz + \
884                                 decode_putfh_maxsz + \
885                                 decode_layoutreturn_maxsz)
886 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
887                                         encode_sequence_maxsz + \
888                                         encode_putrootfh_maxsz +\
889                                         encode_secinfo_no_name_maxsz)
890 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
891                                         decode_sequence_maxsz + \
892                                         decode_putrootfh_maxsz + \
893                                         decode_secinfo_no_name_maxsz)
894 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
895                                          encode_sequence_maxsz + \
896                                          encode_test_stateid_maxsz)
897 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
898                                          decode_sequence_maxsz + \
899                                          decode_test_stateid_maxsz)
900 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
901                                          encode_sequence_maxsz + \
902                                          encode_free_stateid_maxsz)
903 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
904                                          decode_sequence_maxsz + \
905                                          decode_free_stateid_maxsz)
906 
907 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
908                                       compound_encode_hdr_maxsz +
909                                       encode_sequence_maxsz +
910                                       encode_putfh_maxsz +
911                                       encode_getattr_maxsz) *
912                                      XDR_UNIT);
913 
914 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
915                                      compound_decode_hdr_maxsz +
916                                      decode_sequence_maxsz +
917                                      decode_putfh_maxsz) *
918                                     XDR_UNIT);
919 
920 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
921                                            compound_decode_hdr_maxsz +
922                                            decode_sequence_maxsz) *
923                                           XDR_UNIT);
924 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
925 #endif /* CONFIG_NFS_V4_1 */
926 
927 static const umode_t nfs_type2fmt[] = {
928         [NF4BAD] = 0,
929         [NF4REG] = S_IFREG,
930         [NF4DIR] = S_IFDIR,
931         [NF4BLK] = S_IFBLK,
932         [NF4CHR] = S_IFCHR,
933         [NF4LNK] = S_IFLNK,
934         [NF4SOCK] = S_IFSOCK,
935         [NF4FIFO] = S_IFIFO,
936         [NF4ATTRDIR] = 0,
937         [NF4NAMEDATTR] = 0,
938 };
939 
940 struct compound_hdr {
941         int32_t         status;
942         uint32_t        nops;
943         __be32 *        nops_p;
944         uint32_t        taglen;
945         char *          tag;
946         uint32_t        replen;         /* expected reply words */
947         u32             minorversion;
948 };
949 
950 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
951 {
952         __be32 *p = xdr_reserve_space(xdr, nbytes);
953         BUG_ON(!p);
954         return p;
955 }
956 
957 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
958 {
959         WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
960 }
961 
962 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
963 {
964         WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
965 }
966 
967 static void encode_uint32(struct xdr_stream *xdr, u32 n)
968 {
969         WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
970 }
971 
972 static void encode_uint64(struct xdr_stream *xdr, u64 n)
973 {
974         WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
975 }
976 
977 static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
978                 const __u32 *bitmap, size_t len)
979 {
980         ssize_t ret;
981 
982         /* Trim empty words */
983         while (len > 0 && bitmap[len-1] == 0)
984                 len--;
985         ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
986         if (WARN_ON_ONCE(ret < 0))
987                 return ret;
988         return len;
989 }
990 
991 static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
992                 __u32 *res, size_t len)
993 {
994         size_t i;
995         __u32 tmp;
996 
997         while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
998                 len--;
999         for (i = len; i-- > 0;) {
1000                 tmp = bitmap[i] & mask[i];
1001                 res[i] = tmp;
1002         }
1003         return len;
1004 }
1005 
1006 static void encode_nfs4_seqid(struct xdr_stream *xdr,
1007                 const struct nfs_seqid *seqid)
1008 {
1009         if (seqid != NULL)
1010                 encode_uint32(xdr, seqid->sequence->counter);
1011         else
1012                 encode_uint32(xdr, 0);
1013 }
1014 
1015 static void encode_compound_hdr(struct xdr_stream *xdr,
1016                                 struct rpc_rqst *req,
1017                                 struct compound_hdr *hdr)
1018 {
1019         __be32 *p;
1020 
1021         /* initialize running count of expected bytes in reply.
1022          * NOTE: the replied tag SHOULD be the same is the one sent,
1023          * but this is not required as a MUST for the server to do so. */
1024         hdr->replen = 3 + hdr->taglen;
1025 
1026         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
1027         encode_string(xdr, hdr->taglen, hdr->tag);
1028         p = reserve_space(xdr, 8);
1029         *p++ = cpu_to_be32(hdr->minorversion);
1030         hdr->nops_p = p;
1031         *p = cpu_to_be32(hdr->nops);
1032 }
1033 
1034 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
1035                 uint32_t replen,
1036                 struct compound_hdr *hdr)
1037 {
1038         encode_uint32(xdr, op);
1039         hdr->nops++;
1040         hdr->replen += replen;
1041 }
1042 
1043 static void encode_nops(struct compound_hdr *hdr)
1044 {
1045         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
1046         *hdr->nops_p = htonl(hdr->nops);
1047 }
1048 
1049 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1050 {
1051         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
1052 }
1053 
1054 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
1055 {
1056         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1057 }
1058 
1059 static __be32 *
1060 xdr_encode_nfstime4(__be32 *p, const struct timespec *t)
1061 {
1062         p = xdr_encode_hyper(p, (__s64)t->tv_sec);
1063         *p++ = cpu_to_be32(t->tv_nsec);
1064         return p;
1065 }
1066 
1067 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1068                                 const struct nfs4_label *label,
1069                                 const umode_t *umask,
1070                                 const struct nfs_server *server,
1071                                 const uint32_t attrmask[])
1072 {
1073         struct timespec ts;
1074         char owner_name[IDMAP_NAMESZ];
1075         char owner_group[IDMAP_NAMESZ];
1076         int owner_namelen = 0;
1077         int owner_grouplen = 0;
1078         __be32 *p;
1079         uint32_t len = 0;
1080         uint32_t bmval[3] = { 0 };
1081 
1082         /*
1083          * We reserve enough space to write the entire attribute buffer at once.
1084          */
1085         if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) {
1086                 bmval[0] |= FATTR4_WORD0_SIZE;
1087                 len += 8;
1088         }
1089         if (iap->ia_valid & ATTR_MODE) {
1090                 if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) {
1091                         bmval[2] |= FATTR4_WORD2_MODE_UMASK;
1092                         len += 8;
1093                 } else if (attrmask[1] & FATTR4_WORD1_MODE) {
1094                         bmval[1] |= FATTR4_WORD1_MODE;
1095                         len += 4;
1096                 }
1097         }
1098         if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) {
1099                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1100                 if (owner_namelen < 0) {
1101                         dprintk("nfs: couldn't resolve uid %d to string\n",
1102                                         from_kuid(&init_user_ns, iap->ia_uid));
1103                         /* XXX */
1104                         strcpy(owner_name, "nobody");
1105                         owner_namelen = sizeof("nobody") - 1;
1106                         /* goto out; */
1107                 }
1108                 bmval[1] |= FATTR4_WORD1_OWNER;
1109                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1110         }
1111         if ((iap->ia_valid & ATTR_GID) &&
1112            (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) {
1113                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1114                 if (owner_grouplen < 0) {
1115                         dprintk("nfs: couldn't resolve gid %d to string\n",
1116                                         from_kgid(&init_user_ns, iap->ia_gid));
1117                         strcpy(owner_group, "nobody");
1118                         owner_grouplen = sizeof("nobody") - 1;
1119                         /* goto out; */
1120                 }
1121                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1122                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1123         }
1124         if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1125                 if (iap->ia_valid & ATTR_ATIME_SET) {
1126                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1127                         len += 4 + (nfstime4_maxsz << 2);
1128                 } else if (iap->ia_valid & ATTR_ATIME) {
1129                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1130                         len += 4;
1131                 }
1132         }
1133         if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1134                 if (iap->ia_valid & ATTR_MTIME_SET) {
1135                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1136                         len += 4 + (nfstime4_maxsz << 2);
1137                 } else if (iap->ia_valid & ATTR_MTIME) {
1138                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1139                         len += 4;
1140                 }
1141         }
1142 
1143         if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1144                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1145                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1146         }
1147 
1148         xdr_encode_bitmap4(xdr, bmval, ARRAY_SIZE(bmval));
1149         xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);
1150 
1151         if (bmval[0] & FATTR4_WORD0_SIZE)
1152                 p = xdr_encode_hyper(p, iap->ia_size);
1153         if (bmval[1] & FATTR4_WORD1_MODE)
1154                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1155         if (bmval[1] & FATTR4_WORD1_OWNER)
1156                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1157         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1158                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1159         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1160                 if (iap->ia_valid & ATTR_ATIME_SET) {
1161                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1162                         ts = timespec64_to_timespec(iap->ia_atime);
1163                         p = xdr_encode_nfstime4(p, &ts);
1164                 } else
1165                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1166         }
1167         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1168                 if (iap->ia_valid & ATTR_MTIME_SET) {
1169                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1170                         ts = timespec64_to_timespec(iap->ia_mtime);
1171                         p = xdr_encode_nfstime4(p, &ts);
1172                 } else
1173                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1174         }
1175         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
1176                 *p++ = cpu_to_be32(label->lfs);
1177                 *p++ = cpu_to_be32(label->pi);
1178                 *p++ = cpu_to_be32(label->len);
1179                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1180         }
1181         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
1182                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1183                 *p++ = cpu_to_be32(*umask);
1184         }
1185 
1186 /* out: */
1187 }
1188 
1189 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1190 {
1191         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1192         encode_uint32(xdr, access);
1193 }
1194 
1195 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1196 {
1197         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1198         encode_nfs4_seqid(xdr, arg->seqid);
1199         encode_nfs4_stateid(xdr, &arg->stateid);
1200 }
1201 
1202 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1203 {
1204         __be32 *p;
1205 
1206         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1207         p = reserve_space(xdr, 12);
1208         p = xdr_encode_hyper(p, args->offset);
1209         *p = cpu_to_be32(args->count);
1210 }
1211 
1212 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1213 {
1214         __be32 *p;
1215 
1216         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1217         encode_uint32(xdr, create->ftype);
1218 
1219         switch (create->ftype) {
1220         case NF4LNK:
1221                 p = reserve_space(xdr, 4);
1222                 *p = cpu_to_be32(create->u.symlink.len);
1223                 xdr_write_pages(xdr, create->u.symlink.pages, 0,
1224                                 create->u.symlink.len);
1225                 xdr->buf->flags |= XDRBUF_WRITE;
1226                 break;
1227 
1228         case NF4BLK: case NF4CHR:
1229                 p = reserve_space(xdr, 8);
1230                 *p++ = cpu_to_be32(create->u.device.specdata1);
1231                 *p = cpu_to_be32(create->u.device.specdata2);
1232                 break;
1233 
1234         default:
1235                 break;
1236         }
1237 
1238         encode_string(xdr, create->name->len, create->name->name);
1239         encode_attrs(xdr, create->attrs, create->label, &create->umask,
1240                         create->server, create->server->attr_bitmask);
1241 }
1242 
1243 static void encode_getattr(struct xdr_stream *xdr,
1244                 const __u32 *bitmap, const __u32 *mask, size_t len,
1245                 struct compound_hdr *hdr)
1246 {
1247         __u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];
1248 
1249         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1250         if (mask) {
1251                 if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
1252                         len = ARRAY_SIZE(masked_bitmap);
1253                 len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
1254                 bitmap = masked_bitmap;
1255         }
1256         xdr_encode_bitmap4(xdr, bitmap, len);
1257 }
1258 
1259 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1260 {
1261         encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
1262                         ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
1263 }
1264 
1265 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1266                                  const u32 *open_bitmap,
1267                                  struct compound_hdr *hdr)
1268 {
1269         encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
1270 }
1271 
1272 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1273 {
1274         encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
1275                         ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
1276 }
1277 
1278 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1279 {
1280         encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
1281                         ARRAY_SIZE(nfs4_fs_locations_bitmap), hdr);
1282 }
1283 
1284 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1285 {
1286         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1287 }
1288 
1289 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1290 {
1291         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1292         encode_string(xdr, name->len, name->name);
1293 }
1294 
1295 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1296 {
1297         if (fl->fl_type == F_RDLCK)
1298                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1299         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1300 }
1301 
1302 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1303 {
1304         if (fl->fl_end == OFFSET_MAX)
1305                 return ~(uint64_t)0;
1306         return fl->fl_end - fl->fl_start + 1;
1307 }
1308 
1309 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1310 {
1311         __be32 *p;
1312 
1313         p = reserve_space(xdr, 32);
1314         p = xdr_encode_hyper(p, lowner->clientid);
1315         *p++ = cpu_to_be32(20);
1316         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1317         *p++ = cpu_to_be32(lowner->s_dev);
1318         xdr_encode_hyper(p, lowner->id);
1319 }
1320 
1321 /*
1322  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1323  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1324  */
1325 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1326 {
1327         __be32 *p;
1328 
1329         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1330         p = reserve_space(xdr, 28);
1331         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1332         *p++ = cpu_to_be32(args->reclaim);
1333         p = xdr_encode_hyper(p, args->fl->fl_start);
1334         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1335         *p = cpu_to_be32(args->new_lock_owner);
1336         if (args->new_lock_owner){
1337                 encode_nfs4_seqid(xdr, args->open_seqid);
1338                 encode_nfs4_stateid(xdr, &args->open_stateid);
1339                 encode_nfs4_seqid(xdr, args->lock_seqid);
1340                 encode_lockowner(xdr, &args->lock_owner);
1341         }
1342         else {
1343                 encode_nfs4_stateid(xdr, &args->lock_stateid);
1344                 encode_nfs4_seqid(xdr, args->lock_seqid);
1345         }
1346 }
1347 
1348 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1349 {
1350         __be32 *p;
1351 
1352         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1353         p = reserve_space(xdr, 20);
1354         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1355         p = xdr_encode_hyper(p, args->fl->fl_start);
1356         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1357         encode_lockowner(xdr, &args->lock_owner);
1358 }
1359 
1360 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1361 {
1362         __be32 *p;
1363 
1364         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1365         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1366         encode_nfs4_seqid(xdr, args->seqid);
1367         encode_nfs4_stateid(xdr, &args->stateid);
1368         p = reserve_space(xdr, 16);
1369         p = xdr_encode_hyper(p, args->fl->fl_start);
1370         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1371 }
1372 
1373 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1374 {
1375         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1376         encode_lockowner(xdr, lowner);
1377 }
1378 
1379 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1380 {
1381         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1382         encode_string(xdr, name->len, name->name);
1383 }
1384 
1385 static void encode_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
1386 {
1387         encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
1388 }
1389 
1390 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1391 {
1392         __be32 *p;
1393 
1394         p = reserve_space(xdr, 8);
1395         *p++ = cpu_to_be32(share_access);
1396         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1397 }
1398 
1399 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1400 {
1401         __be32 *p;
1402  /*
1403  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1404  * owner 4 = 32
1405  */
1406         encode_nfs4_seqid(xdr, arg->seqid);
1407         encode_share_access(xdr, arg->share_access);
1408         p = reserve_space(xdr, 36);
1409         p = xdr_encode_hyper(p, arg->clientid);
1410         *p++ = cpu_to_be32(24);
1411         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1412         *p++ = cpu_to_be32(arg->server->s_dev);
1413         *p++ = cpu_to_be32(arg->id.uniquifier);
1414         xdr_encode_hyper(p, arg->id.create_time);
1415 }
1416 
1417 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1418 {
1419         __be32 *p;
1420 
1421         p = reserve_space(xdr, 4);
1422         switch(arg->createmode) {
1423         case NFS4_CREATE_UNCHECKED:
1424                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1425                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1426                                 arg->server, arg->server->attr_bitmask);
1427                 break;
1428         case NFS4_CREATE_GUARDED:
1429                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1430                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1431                                 arg->server, arg->server->attr_bitmask);
1432                 break;
1433         case NFS4_CREATE_EXCLUSIVE:
1434                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1435                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1436                 break;
1437         case NFS4_CREATE_EXCLUSIVE4_1:
1438                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1439                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1440                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1441                                 arg->server, arg->server->exclcreat_bitmask);
1442         }
1443 }
1444 
1445 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1446 {
1447         __be32 *p;
1448 
1449         p = reserve_space(xdr, 4);
1450         switch (arg->open_flags & O_CREAT) {
1451         case 0:
1452                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1453                 break;
1454         default:
1455                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1456                 encode_createmode(xdr, arg);
1457         }
1458 }
1459 
1460 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1461 {
1462         __be32 *p;
1463 
1464         p = reserve_space(xdr, 4);
1465         switch (delegation_type) {
1466         case 0:
1467                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1468                 break;
1469         case FMODE_READ:
1470                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1471                 break;
1472         case FMODE_WRITE|FMODE_READ:
1473                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1474                 break;
1475         default:
1476                 BUG();
1477         }
1478 }
1479 
1480 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1481 {
1482         __be32 *p;
1483 
1484         p = reserve_space(xdr, 4);
1485         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1486         encode_string(xdr, name->len, name->name);
1487 }
1488 
1489 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1490 {
1491         __be32 *p;
1492 
1493         p = reserve_space(xdr, 4);
1494         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1495         encode_delegation_type(xdr, type);
1496 }
1497 
1498 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1499 {
1500         __be32 *p;
1501 
1502         p = reserve_space(xdr, 4);
1503         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1504         encode_nfs4_stateid(xdr, stateid);
1505         encode_string(xdr, name->len, name->name);
1506 }
1507 
1508 static inline void encode_claim_fh(struct xdr_stream *xdr)
1509 {
1510         __be32 *p;
1511 
1512         p = reserve_space(xdr, 4);
1513         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1514 }
1515 
1516 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1517 {
1518         __be32 *p;
1519 
1520         p = reserve_space(xdr, 4);
1521         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1522         encode_nfs4_stateid(xdr, stateid);
1523 }
1524 
1525 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1526 {
1527         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1528         encode_openhdr(xdr, arg);
1529         encode_opentype(xdr, arg);
1530         switch (arg->claim) {
1531         case NFS4_OPEN_CLAIM_NULL:
1532                 encode_claim_null(xdr, arg->name);
1533                 break;
1534         case NFS4_OPEN_CLAIM_PREVIOUS:
1535                 encode_claim_previous(xdr, arg->u.delegation_type);
1536                 break;
1537         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1538                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1539                 break;
1540         case NFS4_OPEN_CLAIM_FH:
1541                 encode_claim_fh(xdr);
1542                 break;
1543         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1544                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1545                 break;
1546         default:
1547                 BUG();
1548         }
1549 }
1550 
1551 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1552 {
1553         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1554         encode_nfs4_stateid(xdr, arg->stateid);
1555         encode_nfs4_seqid(xdr, arg->seqid);
1556 }
1557 
1558 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1559 {
1560         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1561         encode_nfs4_stateid(xdr, &arg->stateid);
1562         encode_nfs4_seqid(xdr, arg->seqid);
1563         encode_share_access(xdr, arg->share_access);
1564 }
1565 
1566 static void
1567 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1568 {
1569         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1570         encode_string(xdr, fh->size, fh->data);
1571 }
1572 
1573 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1574 {
1575         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1576 }
1577 
1578 static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1579                         struct compound_hdr *hdr)
1580 {
1581         __be32 *p;
1582 
1583         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1584         encode_nfs4_stateid(xdr, &args->stateid);
1585 
1586         p = reserve_space(xdr, 12);
1587         p = xdr_encode_hyper(p, args->offset);
1588         *p = cpu_to_be32(args->count);
1589 }
1590 
1591 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1592 {
1593         uint32_t attrs[3] = {
1594                 FATTR4_WORD0_RDATTR_ERROR,
1595                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1596         };
1597         uint32_t dircount = readdir->count >> 1;
1598         __be32 *p, verf[2];
1599         uint32_t attrlen = 0;
1600         unsigned int i;
1601 
1602         if (readdir->plus) {
1603                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1604                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1605                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1606                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1607                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1608                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1609                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1610                 dircount >>= 1;
1611         }
1612         /* Use mounted_on_fileid only if the server supports it */
1613         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1614                 attrs[0] |= FATTR4_WORD0_FILEID;
1615         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1616                 attrs[i] &= readdir->bitmask[i];
1617                 if (attrs[i] != 0)
1618                         attrlen = i+1;
1619         }
1620 
1621         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1622         encode_uint64(xdr, readdir->cookie);
1623         encode_nfs4_verifier(xdr, &readdir->verifier);
1624         p = reserve_space(xdr, 12 + (attrlen << 2));
1625         *p++ = cpu_to_be32(dircount);
1626         *p++ = cpu_to_be32(readdir->count);
1627         *p++ = cpu_to_be32(attrlen);
1628         for (i = 0; i < attrlen; i++)
1629                 *p++ = cpu_to_be32(attrs[i]);
1630         memcpy(verf, readdir->verifier.data, sizeof(verf));
1631 
1632         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1633                         __func__,
1634                         (unsigned long long)readdir->cookie,
1635                         verf[0], verf[1],
1636                         attrs[0] & readdir->bitmask[0],
1637                         attrs[1] & readdir->bitmask[1],
1638                         attrs[2] & readdir->bitmask[2]);
1639 }
1640 
1641 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1642 {
1643         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1644 }
1645 
1646 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1647 {
1648         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1649         encode_string(xdr, name->len, name->name);
1650 }
1651 
1652 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1653 {
1654         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1655         encode_string(xdr, oldname->len, oldname->name);
1656         encode_string(xdr, newname->len, newname->name);
1657 }
1658 
1659 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1660                          struct compound_hdr *hdr)
1661 {
1662         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1663         encode_uint64(xdr, clid);
1664 }
1665 
1666 static void
1667 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1668 {
1669         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1670 }
1671 
1672 static void
1673 encode_setacl(struct xdr_stream *xdr, const struct nfs_setaclargs *arg,
1674                 struct compound_hdr *hdr)
1675 {
1676         __be32 *p;
1677 
1678         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1679         encode_nfs4_stateid(xdr, &zero_stateid);
1680         p = reserve_space(xdr, 2*4);
1681         *p++ = cpu_to_be32(1);
1682         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1683         p = reserve_space(xdr, 4);
1684         *p = cpu_to_be32(arg->acl_len);
1685         xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
1686 }
1687 
1688 static void
1689 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1690 {
1691         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1692 }
1693 
1694 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1695 {
1696         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1697         encode_nfs4_stateid(xdr, &arg->stateid);
1698         encode_attrs(xdr, arg->iap, arg->label, NULL, server,
1699                         server->attr_bitmask);
1700 }
1701 
1702 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1703 {
1704         __be32 *p;
1705 
1706         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1707         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1708 
1709         encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1710                         setclientid->sc_clnt->cl_owner_id);
1711         p = reserve_space(xdr, 4);
1712         *p = cpu_to_be32(setclientid->sc_prog);
1713         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1714         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1715         p = reserve_space(xdr, 4);
1716         *p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1717 }
1718 
1719 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1720 {
1721         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1722                         decode_setclientid_confirm_maxsz, hdr);
1723         encode_uint64(xdr, arg->clientid);
1724         encode_nfs4_verifier(xdr, &arg->confirm);
1725 }
1726 
1727 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1728                          struct compound_hdr *hdr)
1729 {
1730         __be32 *p;
1731 
1732         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1733         encode_nfs4_stateid(xdr, &args->stateid);
1734 
1735         p = reserve_space(xdr, 16);
1736         p = xdr_encode_hyper(p, args->offset);
1737         *p++ = cpu_to_be32(args->stable);
1738         *p = cpu_to_be32(args->count);
1739 
1740         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1741 }
1742 
1743 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1744 {
1745         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1746         encode_nfs4_stateid(xdr, stateid);
1747 }
1748 
1749 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1750 {
1751         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1752         encode_string(xdr, name->len, name->name);
1753 }
1754 
1755 #if defined(CONFIG_NFS_V4_1)
1756 /* NFSv4.1 operations */
1757 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1758                                    const struct nfs41_bind_conn_to_session_args *args,
1759                                    struct compound_hdr *hdr)
1760 {
1761         __be32 *p;
1762 
1763         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1764                 decode_bind_conn_to_session_maxsz, hdr);
1765         encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1766         p = xdr_reserve_space(xdr, 8);
1767         *p++ = cpu_to_be32(args->dir);
1768         *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1769 }
1770 
1771 static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
1772 {
1773         unsigned int i;
1774         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1775         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1776                 encode_uint32(xdr, op_map->u.words[i]);
1777 }
1778 
1779 static void encode_exchange_id(struct xdr_stream *xdr,
1780                                const struct nfs41_exchange_id_args *args,
1781                                struct compound_hdr *hdr)
1782 {
1783         __be32 *p;
1784         char impl_name[IMPL_NAME_LIMIT];
1785         int len = 0;
1786 
1787         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1788         encode_nfs4_verifier(xdr, &args->verifier);
1789 
1790         encode_string(xdr, strlen(args->client->cl_owner_id),
1791                         args->client->cl_owner_id);
1792 
1793         encode_uint32(xdr, args->flags);
1794         encode_uint32(xdr, args->state_protect.how);
1795 
1796         switch (args->state_protect.how) {
1797         case SP4_NONE:
1798                 break;
1799         case SP4_MACH_CRED:
1800                 encode_op_map(xdr, &args->state_protect.enforce);
1801                 encode_op_map(xdr, &args->state_protect.allow);
1802                 break;
1803         default:
1804                 WARN_ON_ONCE(1);
1805                 break;
1806         }
1807 
1808         if (send_implementation_id &&
1809             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1810             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1811                 <= sizeof(impl_name) + 1)
1812                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1813                                utsname()->sysname, utsname()->release,
1814                                utsname()->version, utsname()->machine);
1815 
1816         if (len > 0) {
1817                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1818 
1819                 encode_string(xdr,
1820                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1821                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1822                 encode_string(xdr, len, impl_name);
1823                 /* just send zeros for nii_date - the date is in nii_name */
1824                 p = reserve_space(xdr, 12);
1825                 p = xdr_encode_hyper(p, 0);
1826                 *p = cpu_to_be32(0);
1827         } else
1828                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1829 }
1830 
1831 static void encode_create_session(struct xdr_stream *xdr,
1832                                   const struct nfs41_create_session_args *args,
1833                                   struct compound_hdr *hdr)
1834 {
1835         __be32 *p;
1836         struct nfs_client *clp = args->client;
1837         struct rpc_clnt *clnt = clp->cl_rpcclient;
1838         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1839         u32 max_resp_sz_cached;
1840 
1841         /*
1842          * Assumes OPEN is the biggest non-idempotent compound.
1843          * 2 is the verifier.
1844          */
1845         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
1846                                 * XDR_UNIT + RPC_MAX_AUTH_SIZE;
1847 
1848         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1849         p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1850         p = xdr_encode_hyper(p, args->clientid);
1851         *p++ = cpu_to_be32(args->seqid);                        /*Sequence id */
1852         *p++ = cpu_to_be32(args->flags);                        /*flags */
1853 
1854         /* Fore Channel */
1855         *p++ = cpu_to_be32(0);                          /* header padding size */
1856         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1857         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1858         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1859         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1860         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1861         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1862 
1863         /* Back Channel */
1864         *p++ = cpu_to_be32(0);                          /* header padding size */
1865         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1866         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1867         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1868         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1869         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1870         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1871 
1872         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1873         *p++ = cpu_to_be32(1);
1874         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1875 
1876         /* authsys_parms rfc1831 */
1877         *p++ = cpu_to_be32(ktime_to_ns(nn->boot_time)); /* stamp */
1878         p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1879         *p++ = cpu_to_be32(0);                          /* UID */
1880         *p++ = cpu_to_be32(0);                          /* GID */
1881         *p = cpu_to_be32(0);                            /* No more gids */
1882 }
1883 
1884 static void encode_destroy_session(struct xdr_stream *xdr,
1885                                    const struct nfs4_session *session,
1886                                    struct compound_hdr *hdr)
1887 {
1888         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1889         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1890 }
1891 
1892 static void encode_destroy_clientid(struct xdr_stream *xdr,
1893                                    uint64_t clientid,
1894                                    struct compound_hdr *hdr)
1895 {
1896         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1897         encode_uint64(xdr, clientid);
1898 }
1899 
1900 static void encode_reclaim_complete(struct xdr_stream *xdr,
1901                                     const struct nfs41_reclaim_complete_args *args,
1902                                     struct compound_hdr *hdr)
1903 {
1904         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1905         encode_uint32(xdr, args->one_fs);
1906 }
1907 #endif /* CONFIG_NFS_V4_1 */
1908 
1909 static void encode_sequence(struct xdr_stream *xdr,
1910                             const struct nfs4_sequence_args *args,
1911                             struct compound_hdr *hdr)
1912 {
1913 #if defined(CONFIG_NFS_V4_1)
1914         struct nfs4_session *session;
1915         struct nfs4_slot_table *tp;
1916         struct nfs4_slot *slot = args->sa_slot;
1917         __be32 *p;
1918 
1919         tp = slot->table;
1920         session = tp->session;
1921         if (!session)
1922                 return;
1923 
1924         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1925 
1926         /*
1927          * Sessionid + seqid + slotid + max slotid + cache_this
1928          */
1929         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1930                 "max_slotid=%d cache_this=%d\n",
1931                 __func__,
1932                 ((u32 *)session->sess_id.data)[0],
1933                 ((u32 *)session->sess_id.data)[1],
1934                 ((u32 *)session->sess_id.data)[2],
1935                 ((u32 *)session->sess_id.data)[3],
1936                 slot->seq_nr, slot->slot_nr,
1937                 tp->highest_used_slotid, args->sa_cache_this);
1938         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1939         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1940         *p++ = cpu_to_be32(slot->seq_nr);
1941         *p++ = cpu_to_be32(slot->slot_nr);
1942         *p++ = cpu_to_be32(tp->highest_used_slotid);
1943         *p = cpu_to_be32(args->sa_cache_this);
1944 #endif /* CONFIG_NFS_V4_1 */
1945 }
1946 
1947 #ifdef CONFIG_NFS_V4_1
1948 static void
1949 encode_getdeviceinfo(struct xdr_stream *xdr,
1950                      const struct nfs4_getdeviceinfo_args *args,
1951                      struct compound_hdr *hdr)
1952 {
1953         __be32 *p;
1954 
1955         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1956         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1957         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1958                                     NFS4_DEVICEID4_SIZE);
1959         *p++ = cpu_to_be32(args->pdev->layout_type);
1960         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1961 
1962         p = reserve_space(xdr, 4 + 4);
1963         *p++ = cpu_to_be32(1);                  /* bitmap length */
1964         *p++ = cpu_to_be32(args->notify_types);
1965 }
1966 
1967 static void
1968 encode_layoutget(struct xdr_stream *xdr,
1969                       const struct nfs4_layoutget_args *args,
1970                       struct compound_hdr *hdr)
1971 {
1972         __be32 *p;
1973 
1974         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1975         p = reserve_space(xdr, 36);
1976         *p++ = cpu_to_be32(0);     /* Signal layout available */
1977         *p++ = cpu_to_be32(args->type);
1978         *p++ = cpu_to_be32(args->range.iomode);
1979         p = xdr_encode_hyper(p, args->range.offset);
1980         p = xdr_encode_hyper(p, args->range.length);
1981         p = xdr_encode_hyper(p, args->minlength);
1982         encode_nfs4_stateid(xdr, &args->stateid);
1983         encode_uint32(xdr, args->maxcount);
1984 
1985         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1986                 __func__,
1987                 args->type,
1988                 args->range.iomode,
1989                 (unsigned long)args->range.offset,
1990                 (unsigned long)args->range.length,
1991                 args->maxcount);
1992 }
1993 
1994 static int
1995 encode_layoutcommit(struct xdr_stream *xdr,
1996                     struct inode *inode,
1997                     const struct nfs4_layoutcommit_args *args,
1998                     struct compound_hdr *hdr)
1999 {
2000         __be32 *p;
2001 
2002         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
2003                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
2004 
2005         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2006         p = reserve_space(xdr, 20);
2007         /* Only whole file layouts */
2008         p = xdr_encode_hyper(p, 0); /* offset */
2009         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
2010         *p = cpu_to_be32(0); /* reclaim */
2011         encode_nfs4_stateid(xdr, &args->stateid);
2012         if (args->lastbytewritten != U64_MAX) {
2013                 p = reserve_space(xdr, 20);
2014                 *p++ = cpu_to_be32(1); /* newoffset = TRUE */
2015                 p = xdr_encode_hyper(p, args->lastbytewritten);
2016         } else {
2017                 p = reserve_space(xdr, 12);
2018                 *p++ = cpu_to_be32(0); /* newoffset = FALSE */
2019         }
2020         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2021         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2022 
2023         encode_uint32(xdr, args->layoutupdate_len);
2024         if (args->layoutupdate_pages)
2025                 xdr_write_pages(xdr, args->layoutupdate_pages, 0,
2026                                 args->layoutupdate_len);
2027 
2028         return 0;
2029 }
2030 
2031 static void
2032 encode_layoutreturn(struct xdr_stream *xdr,
2033                     const struct nfs4_layoutreturn_args *args,
2034                     struct compound_hdr *hdr)
2035 {
2036         __be32 *p;
2037 
2038         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2039         p = reserve_space(xdr, 16);
2040         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2041         *p++ = cpu_to_be32(args->layout_type);
2042         *p++ = cpu_to_be32(args->range.iomode);
2043         *p = cpu_to_be32(RETURN_FILE);
2044         p = reserve_space(xdr, 16);
2045         p = xdr_encode_hyper(p, args->range.offset);
2046         p = xdr_encode_hyper(p, args->range.length);
2047         spin_lock(&args->inode->i_lock);
2048         encode_nfs4_stateid(xdr, &args->stateid);
2049         spin_unlock(&args->inode->i_lock);
2050         if (args->ld_private->ops && args->ld_private->ops->encode)
2051                 args->ld_private->ops->encode(xdr, args, args->ld_private);
2052         else
2053                 encode_uint32(xdr, 0);
2054 }
2055 
2056 static int
2057 encode_secinfo_no_name(struct xdr_stream *xdr,
2058                        const struct nfs41_secinfo_no_name_args *args,
2059                        struct compound_hdr *hdr)
2060 {
2061         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2062         encode_uint32(xdr, args->style);
2063         return 0;
2064 }
2065 
2066 static void encode_test_stateid(struct xdr_stream *xdr,
2067                                 const struct nfs41_test_stateid_args *args,
2068                                 struct compound_hdr *hdr)
2069 {
2070         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2071         encode_uint32(xdr, 1);
2072         encode_nfs4_stateid(xdr, args->stateid);
2073 }
2074 
2075 static void encode_free_stateid(struct xdr_stream *xdr,
2076                                 const struct nfs41_free_stateid_args *args,
2077                                 struct compound_hdr *hdr)
2078 {
2079         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2080         encode_nfs4_stateid(xdr, &args->stateid);
2081 }
2082 #else
2083 static inline void
2084 encode_layoutreturn(struct xdr_stream *xdr,
2085                     const struct nfs4_layoutreturn_args *args,
2086                     struct compound_hdr *hdr)
2087 {
2088 }
2089 
2090 static void
2091 encode_layoutget(struct xdr_stream *xdr,
2092                       const struct nfs4_layoutget_args *args,
2093                       struct compound_hdr *hdr)
2094 {
2095 }
2096 #endif /* CONFIG_NFS_V4_1 */
2097 
2098 /*
2099  * END OF "GENERIC" ENCODE ROUTINES.
2100  */
2101 
2102 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2103 {
2104 #if defined(CONFIG_NFS_V4_1)
2105         struct nfs4_session *session = args->sa_slot->table->session;
2106         if (session)
2107                 return session->clp->cl_mvops->minor_version;
2108 #endif /* CONFIG_NFS_V4_1 */
2109         return 0;
2110 }
2111 
2112 /*
2113  * Encode an ACCESS request
2114  */
2115 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2116                                 const void *data)
2117 {
2118         const struct nfs4_accessargs *args = data;
2119         struct compound_hdr hdr = {
2120                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2121         };
2122 
2123         encode_compound_hdr(xdr, req, &hdr);
2124         encode_sequence(xdr, &args->seq_args, &hdr);
2125         encode_putfh(xdr, args->fh, &hdr);
2126         encode_access(xdr, args->access, &hdr);
2127         if (args->bitmask)
2128                 encode_getfattr(xdr, args->bitmask, &hdr);
2129         encode_nops(&hdr);
2130 }
2131 
2132 /*
2133  * Encode LOOKUP request
2134  */
2135 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2136                                 const void *data)
2137 {
2138         const struct nfs4_lookup_arg *args = data;
2139         struct compound_hdr hdr = {
2140                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2141         };
2142 
2143         encode_compound_hdr(xdr, req, &hdr);
2144         encode_sequence(xdr, &args->seq_args, &hdr);
2145         encode_putfh(xdr, args->dir_fh, &hdr);
2146         encode_lookup(xdr, args->name, &hdr);
2147         encode_getfh(xdr, &hdr);
2148         encode_getfattr(xdr, args->bitmask, &hdr);
2149         encode_nops(&hdr);
2150 }
2151 
2152 /*
2153  * Encode LOOKUPP request
2154  */
2155 static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
2156                 const void *data)
2157 {
2158         const struct nfs4_lookupp_arg *args = data;
2159         struct compound_hdr hdr = {
2160                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2161         };
2162 
2163         encode_compound_hdr(xdr, req, &hdr);
2164         encode_sequence(xdr, &args->seq_args, &hdr);
2165         encode_putfh(xdr, args->fh, &hdr);
2166         encode_lookupp(xdr, &hdr);
2167         encode_getfh(xdr, &hdr);
2168         encode_getfattr(xdr, args->bitmask, &hdr);
2169         encode_nops(&hdr);
2170 }
2171 
2172 /*
2173  * Encode LOOKUP_ROOT request
2174  */
2175 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2176                                      struct xdr_stream *xdr,
2177                                      const void *data)
2178 {
2179         const struct nfs4_lookup_root_arg *args = data;
2180         struct compound_hdr hdr = {
2181                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2182         };
2183 
2184         encode_compound_hdr(xdr, req, &hdr);
2185         encode_sequence(xdr, &args->seq_args, &hdr);
2186         encode_putrootfh(xdr, &hdr);
2187         encode_getfh(xdr, &hdr);
2188         encode_getfattr(xdr, args->bitmask, &hdr);
2189         encode_nops(&hdr);
2190 }
2191 
2192 /*
2193  * Encode REMOVE request
2194  */
2195 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2196                                 const void *data)
2197 {
2198         const struct nfs_removeargs *args = data;
2199         struct compound_hdr hdr = {
2200                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2201         };
2202 
2203         encode_compound_hdr(xdr, req, &hdr);
2204         encode_sequence(xdr, &args->seq_args, &hdr);
2205         encode_putfh(xdr, args->fh, &hdr);
2206         encode_remove(xdr, &args->name, &hdr);
2207         encode_nops(&hdr);
2208 }
2209 
2210 /*
2211  * Encode RENAME request
2212  */
2213 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2214                                 const void *data)
2215 {
2216         const struct nfs_renameargs *args = data;
2217         struct compound_hdr hdr = {
2218                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2219         };
2220 
2221         encode_compound_hdr(xdr, req, &hdr);
2222         encode_sequence(xdr, &args->seq_args, &hdr);
2223         encode_putfh(xdr, args->old_dir, &hdr);
2224         encode_savefh(xdr, &hdr);
2225         encode_putfh(xdr, args->new_dir, &hdr);
2226         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2227         encode_nops(&hdr);
2228 }
2229 
2230 /*
2231  * Encode LINK request
2232  */
2233 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2234                               const void *data)
2235 {
2236         const struct nfs4_link_arg *args = data;
2237         struct compound_hdr hdr = {
2238                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2239         };
2240 
2241         encode_compound_hdr(xdr, req, &hdr);
2242         encode_sequence(xdr, &args->seq_args, &hdr);
2243         encode_putfh(xdr, args->fh, &hdr);
2244         encode_savefh(xdr, &hdr);
2245         encode_putfh(xdr, args->dir_fh, &hdr);
2246         encode_link(xdr, args->name, &hdr);
2247         encode_restorefh(xdr, &hdr);
2248         encode_getfattr(xdr, args->bitmask, &hdr);
2249         encode_nops(&hdr);
2250 }
2251 
2252 /*
2253  * Encode CREATE request
2254  */
2255 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2256                                 const void *data)
2257 {
2258         const struct nfs4_create_arg *args = data;
2259         struct compound_hdr hdr = {
2260                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2261         };
2262 
2263         encode_compound_hdr(xdr, req, &hdr);
2264         encode_sequence(xdr, &args->seq_args, &hdr);
2265         encode_putfh(xdr, args->dir_fh, &hdr);
2266         encode_create(xdr, args, &hdr);
2267         encode_getfh(xdr, &hdr);
2268         encode_getfattr(xdr, args->bitmask, &hdr);
2269         encode_nops(&hdr);
2270 }
2271 
2272 /*
2273  * Encode SYMLINK request
2274  */
2275 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2276                                  const void *data)
2277 {
2278         const struct nfs4_create_arg *args = data;
2279 
2280         nfs4_xdr_enc_create(req, xdr, args);
2281 }
2282 
2283 /*
2284  * Encode GETATTR request
2285  */
2286 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2287                                  const void *data)
2288 {
2289         const struct nfs4_getattr_arg *args = data;
2290         struct compound_hdr hdr = {
2291                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2292         };
2293 
2294         encode_compound_hdr(xdr, req, &hdr);
2295         encode_sequence(xdr, &args->seq_args, &hdr);
2296         encode_putfh(xdr, args->fh, &hdr);
2297         encode_getfattr(xdr, args->bitmask, &hdr);
2298         encode_nops(&hdr);
2299 }
2300 
2301 /*
2302  * Encode a CLOSE request
2303  */
2304 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2305                                const void *data)
2306 {
2307         const struct nfs_closeargs *args = data;
2308         struct compound_hdr hdr = {
2309                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2310         };
2311 
2312         encode_compound_hdr(xdr, req, &hdr);
2313         encode_sequence(xdr, &args->seq_args, &hdr);
2314         encode_putfh(xdr, args->fh, &hdr);
2315         if (args->lr_args)
2316                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2317         if (args->bitmask != NULL)
2318                 encode_getfattr(xdr, args->bitmask, &hdr);
2319         encode_close(xdr, args, &hdr);
2320         encode_nops(&hdr);
2321 }
2322 
2323 /*
2324  * Encode an OPEN request
2325  */
2326 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2327                               const void *data)
2328 {
2329         const struct nfs_openargs *args = data;
2330         struct compound_hdr hdr = {
2331                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2332         };
2333 
2334         encode_compound_hdr(xdr, req, &hdr);
2335         encode_sequence(xdr, &args->seq_args, &hdr);
2336         encode_putfh(xdr, args->fh, &hdr);
2337         encode_open(xdr, args, &hdr);
2338         encode_getfh(xdr, &hdr);
2339         if (args->access)
2340                 encode_access(xdr, args->access, &hdr);
2341         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2342         if (args->lg_args) {
2343                 encode_layoutget(xdr, args->lg_args, &hdr);
2344                 rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2345                                         args->lg_args->layout.pglen,
2346                                         hdr.replen);
2347         }
2348         encode_nops(&hdr);
2349 }
2350 
2351 /*
2352  * Encode an OPEN_CONFIRM request
2353  */
2354 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2355                                       struct xdr_stream *xdr,
2356                                       const void *data)
2357 {
2358         const struct nfs_open_confirmargs *args = data;
2359         struct compound_hdr hdr = {
2360                 .nops   = 0,
2361         };
2362 
2363         encode_compound_hdr(xdr, req, &hdr);
2364         encode_putfh(xdr, args->fh, &hdr);
2365         encode_open_confirm(xdr, args, &hdr);
2366         encode_nops(&hdr);
2367 }
2368 
2369 /*
2370  * Encode an OPEN request with no attributes.
2371  */
2372 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2373                                      struct xdr_stream *xdr,
2374                                      const void *data)
2375 {
2376         const struct nfs_openargs *args = data;
2377         struct compound_hdr hdr = {
2378                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2379         };
2380 
2381         encode_compound_hdr(xdr, req, &hdr);
2382         encode_sequence(xdr, &args->seq_args, &hdr);
2383         encode_putfh(xdr, args->fh, &hdr);
2384         encode_open(xdr, args, &hdr);
2385         if (args->access)
2386                 encode_access(xdr, args->access, &hdr);
2387         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2388         if (args->lg_args) {
2389                 encode_layoutget(xdr, args->lg_args, &hdr);
2390                 rpc_prepare_reply_pages(req, args->lg_args->layout.pages, 0,
2391                                         args->lg_args->layout.pglen,
2392                                         hdr.replen);
2393         }
2394         encode_nops(&hdr);
2395 }
2396 
2397 /*
2398  * Encode an OPEN_DOWNGRADE request
2399  */
2400 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2401                                         struct xdr_stream *xdr,
2402                                         const void *data)
2403 {
2404         const struct nfs_closeargs *args = data;
2405         struct compound_hdr hdr = {
2406                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2407         };
2408 
2409         encode_compound_hdr(xdr, req, &hdr);
2410         encode_sequence(xdr, &args->seq_args, &hdr);
2411         encode_putfh(xdr, args->fh, &hdr);
2412         if (args->lr_args)
2413                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2414         encode_open_downgrade(xdr, args, &hdr);
2415         encode_nops(&hdr);
2416 }
2417 
2418 /*
2419  * Encode a LOCK request
2420  */
2421 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2422                               const void *data)
2423 {
2424         const struct nfs_lock_args *args = data;
2425         struct compound_hdr hdr = {
2426                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2427         };
2428 
2429         encode_compound_hdr(xdr, req, &hdr);
2430         encode_sequence(xdr, &args->seq_args, &hdr);
2431         encode_putfh(xdr, args->fh, &hdr);
2432         encode_lock(xdr, args, &hdr);
2433         encode_nops(&hdr);
2434 }
2435 
2436 /*
2437  * Encode a LOCKT request
2438  */
2439 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2440                                const void *data)
2441 {
2442         const struct nfs_lockt_args *args = data;
2443         struct compound_hdr hdr = {
2444                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2445         };
2446 
2447         encode_compound_hdr(xdr, req, &hdr);
2448         encode_sequence(xdr, &args->seq_args, &hdr);
2449         encode_putfh(xdr, args->fh, &hdr);
2450         encode_lockt(xdr, args, &hdr);
2451         encode_nops(&hdr);
2452 }
2453 
2454 /*
2455  * Encode a LOCKU request
2456  */
2457 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2458                                const void *data)
2459 {
2460         const struct nfs_locku_args *args = data;
2461         struct compound_hdr hdr = {
2462                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2463         };
2464 
2465         encode_compound_hdr(xdr, req, &hdr);
2466         encode_sequence(xdr, &args->seq_args, &hdr);
2467         encode_putfh(xdr, args->fh, &hdr);
2468         encode_locku(xdr, args, &hdr);
2469         encode_nops(&hdr);
2470 }
2471 
2472 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2473                                            struct xdr_stream *xdr,
2474                                            const void *data)
2475 {
2476         const struct nfs_release_lockowner_args *args = data;
2477         struct compound_hdr hdr = {
2478                 .minorversion = 0,
2479         };
2480 
2481         encode_compound_hdr(xdr, req, &hdr);
2482         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2483         encode_nops(&hdr);
2484 }
2485 
2486 /*
2487  * Encode a READLINK request
2488  */
2489 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2490                                   const void *data)
2491 {
2492         const struct nfs4_readlink *args = data;
2493         struct compound_hdr hdr = {
2494                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2495         };
2496 
2497         encode_compound_hdr(xdr, req, &hdr);
2498         encode_sequence(xdr, &args->seq_args, &hdr);
2499         encode_putfh(xdr, args->fh, &hdr);
2500         encode_readlink(xdr, args, req, &hdr);
2501 
2502         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2503                                 args->pglen, hdr.replen);
2504         encode_nops(&hdr);
2505 }
2506 
2507 /*
2508  * Encode a READDIR request
2509  */
2510 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2511                                  const void *data)
2512 {
2513         const struct nfs4_readdir_arg *args = data;
2514         struct compound_hdr hdr = {
2515                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2516         };
2517 
2518         encode_compound_hdr(xdr, req, &hdr);
2519         encode_sequence(xdr, &args->seq_args, &hdr);
2520         encode_putfh(xdr, args->fh, &hdr);
2521         encode_readdir(xdr, args, req, &hdr);
2522 
2523         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2524                                 args->count, hdr.replen);
2525         encode_nops(&hdr);
2526 }
2527 
2528 /*
2529  * Encode a READ request
2530  */
2531 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2532                               const void *data)
2533 {
2534         const struct nfs_pgio_args *args = data;
2535         struct compound_hdr hdr = {
2536                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2537         };
2538 
2539         encode_compound_hdr(xdr, req, &hdr);
2540         encode_sequence(xdr, &args->seq_args, &hdr);
2541         encode_putfh(xdr, args->fh, &hdr);
2542         encode_read(xdr, args, &hdr);
2543 
2544         rpc_prepare_reply_pages(req, args->pages, args->pgbase,
2545                                 args->count, hdr.replen);
2546         req->rq_rcv_buf.flags |= XDRBUF_READ;
2547         encode_nops(&hdr);
2548 }
2549 
2550 /*
2551  * Encode an SETATTR request
2552  */
2553 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2554                                  const void *data)
2555 {
2556         const struct nfs_setattrargs *args = data;
2557         struct compound_hdr hdr = {
2558                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2559         };
2560 
2561         encode_compound_hdr(xdr, req, &hdr);
2562         encode_sequence(xdr, &args->seq_args, &hdr);
2563         encode_putfh(xdr, args->fh, &hdr);
2564         encode_setattr(xdr, args, args->server, &hdr);
2565         encode_getfattr(xdr, args->bitmask, &hdr);
2566         encode_nops(&hdr);
2567 }
2568 
2569 /*
2570  * Encode a GETACL request
2571  */
2572 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2573                                 const void *data)
2574 {
2575         const struct nfs_getaclargs *args = data;
2576         struct compound_hdr hdr = {
2577                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2578         };
2579         const __u32 nfs4_acl_bitmap[1] = {
2580                 [0] = FATTR4_WORD0_ACL,
2581         };
2582         uint32_t replen;
2583 
2584         encode_compound_hdr(xdr, req, &hdr);
2585         encode_sequence(xdr, &args->seq_args, &hdr);
2586         encode_putfh(xdr, args->fh, &hdr);
2587         replen = hdr.replen + op_decode_hdr_maxsz;
2588         encode_getattr(xdr, nfs4_acl_bitmap, NULL,
2589                         ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
2590 
2591         rpc_prepare_reply_pages(req, args->acl_pages, 0,
2592                                 args->acl_len, replen + 1);
2593         encode_nops(&hdr);
2594 }
2595 
2596 /*
2597  * Encode a WRITE request
2598  */
2599 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2600                                const void *data)
2601 {
2602         const struct nfs_pgio_args *args = data;
2603         struct compound_hdr hdr = {
2604                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2605         };
2606 
2607         encode_compound_hdr(xdr, req, &hdr);
2608         encode_sequence(xdr, &args->seq_args, &hdr);
2609         encode_putfh(xdr, args->fh, &hdr);
2610         encode_write(xdr, args, &hdr);
2611         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2612         if (args->bitmask)
2613                 encode_getfattr(xdr, args->bitmask, &hdr);
2614         encode_nops(&hdr);
2615 }
2616 
2617 /*
2618  *  a COMMIT request
2619  */
2620 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2621                                 const void *data)
2622 {
2623         const struct nfs_commitargs *args = data;
2624         struct compound_hdr hdr = {
2625                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2626         };
2627 
2628         encode_compound_hdr(xdr, req, &hdr);
2629         encode_sequence(xdr, &args->seq_args, &hdr);
2630         encode_putfh(xdr, args->fh, &hdr);
2631         encode_commit(xdr, args, &hdr);
2632         encode_nops(&hdr);
2633 }
2634 
2635 /*
2636  * FSINFO request
2637  */
2638 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2639                                 const void *data)
2640 {
2641         const struct nfs4_fsinfo_arg *args = data;
2642         struct compound_hdr hdr = {
2643                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2644         };
2645 
2646         encode_compound_hdr(xdr, req, &hdr);
2647         encode_sequence(xdr, &args->seq_args, &hdr);
2648         encode_putfh(xdr, args->fh, &hdr);
2649         encode_fsinfo(xdr, args->bitmask, &hdr);
2650         encode_nops(&hdr);
2651 }
2652 
2653 /*
2654  * a PATHCONF request
2655  */
2656 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2657                                   const void *data)
2658 {
2659         const struct nfs4_pathconf_arg *args = data;
2660         struct compound_hdr hdr = {
2661                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2662         };
2663 
2664         encode_compound_hdr(xdr, req, &hdr);
2665         encode_sequence(xdr, &args->seq_args, &hdr);
2666         encode_putfh(xdr, args->fh, &hdr);
2667         encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
2668                         ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
2669         encode_nops(&hdr);
2670 }
2671 
2672 /*
2673  * a STATFS request
2674  */
2675 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2676                                 const void *data)
2677 {
2678         const struct nfs4_statfs_arg *args = data;
2679         struct compound_hdr hdr = {
2680                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2681         };
2682 
2683         encode_compound_hdr(xdr, req, &hdr);
2684         encode_sequence(xdr, &args->seq_args, &hdr);
2685         encode_putfh(xdr, args->fh, &hdr);
2686         encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
2687                         ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
2688         encode_nops(&hdr);
2689 }
2690 
2691 /*
2692  * GETATTR_BITMAP request
2693  */
2694 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2695                                      struct xdr_stream *xdr,
2696                                      const void *data)
2697 {
2698         const struct nfs4_server_caps_arg *args = data;
2699         const u32 *bitmask = args->bitmask;
2700         struct compound_hdr hdr = {
2701                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2702         };
2703 
2704         encode_compound_hdr(xdr, req, &hdr);
2705         encode_sequence(xdr, &args->seq_args, &hdr);
2706         encode_putfh(xdr, args->fhandle, &hdr);
2707         encode_getattr(xdr, bitmask, NULL, 3, &hdr);
2708         encode_nops(&hdr);
2709 }
2710 
2711 /*
2712  * a RENEW request
2713  */
2714 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2715                                const void *data)
2716 
2717 {
2718         const struct nfs_client *clp = data;
2719         struct compound_hdr hdr = {
2720                 .nops   = 0,
2721         };
2722 
2723         encode_compound_hdr(xdr, req, &hdr);
2724         encode_renew(xdr, clp->cl_clientid, &hdr);
2725         encode_nops(&hdr);
2726 }
2727 
2728 /*
2729  * a SETCLIENTID request
2730  */
2731 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2732                                      struct xdr_stream *xdr,
2733                                      const void *data)
2734 {
2735         const struct nfs4_setclientid *sc = data;
2736         struct compound_hdr hdr = {
2737                 .nops   = 0,
2738         };
2739 
2740         encode_compound_hdr(xdr, req, &hdr);
2741         encode_setclientid(xdr, sc, &hdr);
2742         encode_nops(&hdr);
2743 }
2744 
2745 /*
2746  * a SETCLIENTID_CONFIRM request
2747  */
2748 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2749                                              struct xdr_stream *xdr,
2750                                              const void *data)
2751 {
2752         const struct nfs4_setclientid_res *arg = data;
2753         struct compound_hdr hdr = {
2754                 .nops   = 0,
2755         };
2756 
2757         encode_compound_hdr(xdr, req, &hdr);
2758         encode_setclientid_confirm(xdr, arg, &hdr);
2759         encode_nops(&hdr);
2760 }
2761 
2762 /*
2763  * DELEGRETURN request
2764  */
2765 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2766                                      struct xdr_stream *xdr,
2767                                      const void *data)
2768 {
2769         const struct nfs4_delegreturnargs *args = data;
2770         struct compound_hdr hdr = {
2771                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2772         };
2773 
2774         encode_compound_hdr(xdr, req, &hdr);
2775         encode_sequence(xdr, &args->seq_args, &hdr);
2776         encode_putfh(xdr, args->fhandle, &hdr);
2777         if (args->lr_args)
2778                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2779         if (args->bitmask)
2780                 encode_getfattr(xdr, args->bitmask, &hdr);
2781         encode_delegreturn(xdr, args->stateid, &hdr);
2782         encode_nops(&hdr);
2783 }
2784 
2785 /*
2786  * Encode FS_LOCATIONS request
2787  */
2788 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2789                                       struct xdr_stream *xdr,
2790                                       const void *data)
2791 {
2792         const struct nfs4_fs_locations_arg *args = data;
2793         struct compound_hdr hdr = {
2794                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2795         };
2796         uint32_t replen;
2797 
2798         encode_compound_hdr(xdr, req, &hdr);
2799         encode_sequence(xdr, &args->seq_args, &hdr);
2800         if (args->migration) {
2801                 encode_putfh(xdr, args->fh, &hdr);
2802                 replen = hdr.replen;
2803                 encode_fs_locations(xdr, args->bitmask, &hdr);
2804                 if (args->renew)
2805                         encode_renew(xdr, args->clientid, &hdr);
2806         } else {
2807                 encode_putfh(xdr, args->dir_fh, &hdr);
2808                 encode_lookup(xdr, args->name, &hdr);
2809                 replen = hdr.replen;
2810                 encode_fs_locations(xdr, args->bitmask, &hdr);
2811         }
2812 
2813         rpc_prepare_reply_pages(req, (struct page **)&args->page, 0,
2814                                 PAGE_SIZE, replen + 1);
2815         encode_nops(&hdr);
2816 }
2817 
2818 /*
2819  * Encode SECINFO request
2820  */
2821 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2822                                 struct xdr_stream *xdr,
2823                                 const void *data)
2824 {
2825         const struct nfs4_secinfo_arg *args = data;
2826         struct compound_hdr hdr = {
2827                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2828         };
2829 
2830         encode_compound_hdr(xdr, req, &hdr);
2831         encode_sequence(xdr, &args->seq_args, &hdr);
2832         encode_putfh(xdr, args->dir_fh, &hdr);
2833         encode_secinfo(xdr, args->name, &hdr);
2834         encode_nops(&hdr);
2835 }
2836 
2837 /*
2838  * Encode FSID_PRESENT request
2839  */
2840 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2841                                       struct xdr_stream *xdr,
2842                                       const void *data)
2843 {
2844         const struct nfs4_fsid_present_arg *args = data;
2845         struct compound_hdr hdr = {
2846                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2847         };
2848 
2849         encode_compound_hdr(xdr, req, &hdr);
2850         encode_sequence(xdr, &args->seq_args, &hdr);
2851         encode_putfh(xdr, args->fh, &hdr);
2852         encode_getfh(xdr, &hdr);
2853         if (args->renew)
2854                 encode_renew(xdr, args->clientid, &hdr);
2855         encode_nops(&hdr);
2856 }
2857 
2858 #if defined(CONFIG_NFS_V4_1)
2859 /*
2860  * BIND_CONN_TO_SESSION request
2861  */
2862 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2863                                 struct xdr_stream *xdr,
2864                                 const void *data)
2865 {
2866         const struct nfs41_bind_conn_to_session_args *args = data;
2867         struct compound_hdr hdr = {
2868                 .minorversion = args->client->cl_mvops->minor_version,
2869         };
2870 
2871         encode_compound_hdr(xdr, req, &hdr);
2872         encode_bind_conn_to_session(xdr, args, &hdr);
2873         encode_nops(&hdr);
2874 }
2875 
2876 /*
2877  * EXCHANGE_ID request
2878  */
2879 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2880                                      struct xdr_stream *xdr,
2881                                      const void *data)
2882 {
2883         const struct nfs41_exchange_id_args *args = data;
2884         struct compound_hdr hdr = {
2885                 .minorversion = args->client->cl_mvops->minor_version,
2886         };
2887 
2888         encode_compound_hdr(xdr, req, &hdr);
2889         encode_exchange_id(xdr, args, &hdr);
2890         encode_nops(&hdr);
2891 }
2892 
2893 /*
2894  * a CREATE_SESSION request
2895  */
2896 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2897                                         struct xdr_stream *xdr,
2898                                         const void *data)
2899 {
2900         const struct nfs41_create_session_args *args = data;
2901         struct compound_hdr hdr = {
2902                 .minorversion = args->client->cl_mvops->minor_version,
2903         };
2904 
2905         encode_compound_hdr(xdr, req, &hdr);
2906         encode_create_session(xdr, args, &hdr);
2907         encode_nops(&hdr);
2908 }
2909 
2910 /*
2911  * a DESTROY_SESSION request
2912  */
2913 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2914                                          struct xdr_stream *xdr,
2915                                          const void *data)
2916 {
2917         const struct nfs4_session *session = data;
2918         struct compound_hdr hdr = {
2919                 .minorversion = session->clp->cl_mvops->minor_version,
2920         };
2921 
2922         encode_compound_hdr(xdr, req, &hdr);
2923         encode_destroy_session(xdr, session, &hdr);
2924         encode_nops(&hdr);
2925 }
2926 
2927 /*
2928  * a DESTROY_CLIENTID request
2929  */
2930 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2931                                          struct xdr_stream *xdr,
2932                                          const void *data)
2933 {
2934         const struct nfs_client *clp = data;
2935         struct compound_hdr hdr = {
2936                 .minorversion = clp->cl_mvops->minor_version,
2937         };
2938 
2939         encode_compound_hdr(xdr, req, &hdr);
2940         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2941         encode_nops(&hdr);
2942 }
2943 
2944 /*
2945  * a SEQUENCE request
2946  */
2947 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2948                                   const void *data)
2949 {
2950         const struct nfs4_sequence_args *args = data;
2951         struct compound_hdr hdr = {
2952                 .minorversion = nfs4_xdr_minorversion(args),
2953         };
2954 
2955         encode_compound_hdr(xdr, req, &hdr);
2956         encode_sequence(xdr, args, &hdr);
2957         encode_nops(&hdr);
2958 }
2959 
2960 /*
2961  * a GET_LEASE_TIME request
2962  */
2963 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2964                                         struct xdr_stream *xdr,
2965                                         const void *data)
2966 {
2967         const struct nfs4_get_lease_time_args *args = data;
2968         struct compound_hdr hdr = {
2969                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2970         };
2971         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2972 
2973         encode_compound_hdr(xdr, req, &hdr);
2974         encode_sequence(xdr, &args->la_seq_args, &hdr);
2975         encode_putrootfh(xdr, &hdr);
2976         encode_fsinfo(xdr, lease_bitmap, &hdr);
2977         encode_nops(&hdr);
2978 }
2979 
2980 /*
2981  * a RECLAIM_COMPLETE request
2982  */
2983 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2984                                           struct xdr_stream *xdr,
2985                                           const void *data)
2986 {
2987         const struct nfs41_reclaim_complete_args *args = data;
2988         struct compound_hdr hdr = {
2989                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2990         };
2991 
2992         encode_compound_hdr(xdr, req, &hdr);
2993         encode_sequence(xdr, &args->seq_args, &hdr);
2994         encode_reclaim_complete(xdr, args, &hdr);
2995         encode_nops(&hdr);
2996 }
2997 
2998 /*
2999  * Encode GETDEVICEINFO request
3000  */
3001 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
3002                                        struct xdr_stream *xdr,
3003                                        const void *data)
3004 {
3005         const struct nfs4_getdeviceinfo_args *args = data;
3006         struct compound_hdr hdr = {
3007                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3008         };
3009 
3010         encode_compound_hdr(xdr, req, &hdr);
3011         encode_sequence(xdr, &args->seq_args, &hdr);
3012         encode_getdeviceinfo(xdr, args, &hdr);
3013 
3014         /* set up reply kvec. Subtract notification bitmap max size (2)
3015          * so that notification bitmap is put in xdr_buf tail */
3016         rpc_prepare_reply_pages(req, args->pdev->pages, args->pdev->pgbase,
3017                                 args->pdev->pglen, hdr.replen - 2);
3018         encode_nops(&hdr);
3019 }
3020 
3021 /*
3022  *  Encode LAYOUTGET request
3023  */
3024 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
3025                                    struct xdr_stream *xdr,
3026                                    const void *data)
3027 {
3028         const struct nfs4_layoutget_args *args = data;
3029         struct compound_hdr hdr = {
3030                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3031         };
3032 
3033         encode_compound_hdr(xdr, req, &hdr);
3034         encode_sequence(xdr, &args->seq_args, &hdr);
3035         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3036         encode_layoutget(xdr, args, &hdr);
3037 
3038         rpc_prepare_reply_pages(req, args->layout.pages, 0,
3039                                 args->layout.pglen, hdr.replen);
3040         encode_nops(&hdr);
3041 }
3042 
3043 /*
3044  *  Encode LAYOUTCOMMIT request
3045  */
3046 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
3047                                       struct xdr_stream *xdr,
3048                                       const void *priv)
3049 {
3050         const struct nfs4_layoutcommit_args *args = priv;
3051         struct nfs4_layoutcommit_data *data =
3052                 container_of(args, struct nfs4_layoutcommit_data, args);
3053         struct compound_hdr hdr = {
3054                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3055         };
3056 
3057         encode_compound_hdr(xdr, req, &hdr);
3058         encode_sequence(xdr, &args->seq_args, &hdr);
3059         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3060         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
3061         encode_getfattr(xdr, args->bitmask, &hdr);
3062         encode_nops(&hdr);
3063 }
3064 
3065 /*
3066  * Encode LAYOUTRETURN request
3067  */
3068 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
3069                                       struct xdr_stream *xdr,
3070                                       const void *data)
3071 {
3072         const struct nfs4_layoutreturn_args *args = data;
3073         struct compound_hdr hdr = {
3074                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3075         };
3076 
3077         encode_compound_hdr(xdr, req, &hdr);
3078         encode_sequence(xdr, &args->seq_args, &hdr);
3079         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3080         encode_layoutreturn(xdr, args, &hdr);
3081         encode_nops(&hdr);
3082 }
3083 
3084 /*
3085  * Encode SECINFO_NO_NAME request
3086  */
3087 static void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3088                                         struct xdr_stream *xdr,
3089                                         const void *data)
3090 {
3091         const struct nfs41_secinfo_no_name_args *args = data;
3092         struct compound_hdr hdr = {
3093                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3094         };
3095 
3096         encode_compound_hdr(xdr, req, &hdr);
3097         encode_sequence(xdr, &args->seq_args, &hdr);
3098         encode_putrootfh(xdr, &hdr);
3099         encode_secinfo_no_name(xdr, args, &hdr);
3100         encode_nops(&hdr);
3101 }
3102 
3103 /*
3104  *  Encode TEST_STATEID request
3105  */
3106 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3107                                       struct xdr_stream *xdr,
3108                                       const void *data)
3109 {
3110         const struct nfs41_test_stateid_args *args = data;
3111         struct compound_hdr hdr = {
3112                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3113         };
3114 
3115         encode_compound_hdr(xdr, req, &hdr);
3116         encode_sequence(xdr, &args->seq_args, &hdr);
3117         encode_test_stateid(xdr, args, &hdr);
3118         encode_nops(&hdr);
3119 }
3120 
3121 /*
3122  *  Encode FREE_STATEID request
3123  */
3124 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3125                                      struct xdr_stream *xdr,
3126                                      const void *data)
3127 {
3128         const struct nfs41_free_stateid_args *args = data;
3129         struct compound_hdr hdr = {
3130                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3131         };
3132 
3133         encode_compound_hdr(xdr, req, &hdr);
3134         encode_sequence(xdr, &args->seq_args, &hdr);
3135         encode_free_stateid(xdr, args, &hdr);
3136         encode_nops(&hdr);
3137 }
3138 #endif /* CONFIG_NFS_V4_1 */
3139 
3140 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3141 {
3142         ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
3143                         NFS4_OPAQUE_LIMIT);
3144         if (unlikely(ret < 0))
3145                 return -EIO;
3146         *len = ret;
3147         return 0;
3148 }
3149 
3150 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3151 {
3152         __be32 *p;
3153 
3154         p = xdr_inline_decode(xdr, 8);
3155         if (unlikely(!p))
3156                 return -EIO;
3157         hdr->status = be32_to_cpup(p++);
3158         hdr->taglen = be32_to_cpup(p);
3159 
3160         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3161         if (unlikely(!p))
3162                 return -EIO;
3163         hdr->tag = (char *)p;
3164         p += XDR_QUADLEN(hdr->taglen);
3165         hdr->nops = be32_to_cpup(p);
3166         if (unlikely(hdr->nops < 1))
3167                 return nfs4_stat_to_errno(hdr->status);
3168         return 0;
3169 }
3170 
3171 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3172                 int *nfs_retval)
3173 {
3174         __be32 *p;
3175         uint32_t opnum;
3176         int32_t nfserr;
3177 
3178         p = xdr_inline_decode(xdr, 8);
3179         if (unlikely(!p))
3180                 goto out_overflow;
3181         opnum = be32_to_cpup(p++);
3182         if (unlikely(opnum != expected))
3183                 goto out_bad_operation;
3184         if (unlikely(*p != cpu_to_be32(NFS_OK)))
3185                 goto out_status;
3186         *nfs_retval = 0;
3187         return true;
3188 out_status:
3189         nfserr = be32_to_cpup(p);
3190         trace_nfs4_xdr_status(opnum, nfserr);
3191         *nfs_retval = nfs4_stat_to_errno(nfserr);
3192         return true;
3193 out_bad_operation:
3194         dprintk("nfs: Server returned operation"
3195                 " %d but we issued a request for %d\n",
3196                         opnum, expected);
3197         *nfs_retval = -EREMOTEIO;
3198         return false;
3199 out_overflow:
3200         *nfs_retval = -EIO;
3201         return false;
3202 }
3203 
3204 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3205 {
3206         int retval;
3207 
3208         __decode_op_hdr(xdr, expected, &retval);
3209         return retval;
3210 }
3211 
3212 /* Dummy routine */
3213 static int decode_ace(struct xdr_stream *xdr, void *ace)
3214 {
3215         __be32 *p;
3216         unsigned int strlen;
3217         char *str;
3218 
3219         p = xdr_inline_decode(xdr, 12);
3220         if (unlikely(!p))
3221                 return -EIO;
3222         return decode_opaque_inline(xdr, &strlen, &str);
3223 }
3224 
3225 static ssize_t
3226 decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
3227 {
3228         ssize_t ret;
3229 
3230         ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
3231         if (likely(ret >= 0))
3232                 return ret;
3233         if (ret != -EMSGSIZE)
3234                 return -EIO;
3235         return sz;
3236 }
3237 
3238 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3239 {
3240         ssize_t ret;
3241         ret = decode_bitmap4(xdr, bitmap, 3);
3242         return ret < 0 ? ret : 0;
3243 }
3244 
3245 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3246 {
3247         __be32 *p;
3248 
3249         p = xdr_inline_decode(xdr, 4);
3250         if (unlikely(!p))
3251                 return -EIO;
3252         *attrlen = be32_to_cpup(p);
3253         *savep = xdr_stream_pos(xdr);
3254         return 0;
3255 }
3256 
3257 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3258 {
3259         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3260                 int ret;
3261                 ret = decode_attr_bitmap(xdr, bitmask);
3262                 if (unlikely(ret < 0))
3263                         return ret;
3264                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3265         } else
3266                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3267         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3268                 bitmask[0], bitmask[1], bitmask[2]);
3269         return 0;
3270 }
3271 
3272 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3273 {
3274         __be32 *p;
3275         int ret = 0;
3276 
3277         *type = 0;
3278         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3279                 return -EIO;
3280         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3281                 p = xdr_inline_decode(xdr, 4);
3282                 if (unlikely(!p))
3283                         return -EIO;
3284                 *type = be32_to_cpup(p);
3285                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3286                         dprintk("%s: bad type %d\n", __func__, *type);
3287                         return -EIO;
3288                 }
3289                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3290                 ret = NFS_ATTR_FATTR_TYPE;
3291         }
3292         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3293         return ret;
3294 }
3295 
3296 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3297                                       uint32_t *bitmap, uint32_t *type)
3298 {
3299         __be32 *p;
3300 
3301         *type = 0;
3302         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3303                 return -EIO;
3304         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3305                 p = xdr_inline_decode(xdr, 4);
3306                 if (unlikely(!p))
3307                         return -EIO;
3308                 *type = be32_to_cpup(p);
3309                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3310         }
3311         dprintk("%s: expire type=0x%x\n", __func__, *type);
3312         return 0;
3313 }
3314 
3315 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3316 {
3317         __be32 *p;
3318         int ret = 0;
3319 
3320         *change = 0;
3321         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3322                 return -EIO;
3323         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3324                 p = xdr_inline_decode(xdr, 8);
3325                 if (unlikely(!p))
3326                         return -EIO;
3327                 xdr_decode_hyper(p, change);
3328                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3329                 ret = NFS_ATTR_FATTR_CHANGE;
3330         }
3331         dprintk("%s: change attribute=%Lu\n", __func__,
3332                         (unsigned long long)*change);
3333         return ret;
3334 }
3335 
3336 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3337 {
3338         __be32 *p;
3339         int ret = 0;
3340 
3341         *size = 0;
3342         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3343                 return -EIO;
3344         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3345                 p = xdr_inline_decode(xdr, 8);
3346                 if (unlikely(!p))
3347                         return -EIO;
3348                 xdr_decode_hyper(p, size);
3349                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3350                 ret = NFS_ATTR_FATTR_SIZE;
3351         }
3352         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3353         return ret;
3354 }
3355 
3356 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3357 {
3358         __be32 *p;
3359 
3360         *res = 0;
3361         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3362                 return -EIO;
3363         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3364                 p = xdr_inline_decode(xdr, 4);
3365                 if (unlikely(!p))
3366                         return -EIO;
3367                 *res = be32_to_cpup(p);
3368                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3369         }
3370         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3371         return 0;
3372 }
3373 
3374 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3375 {
3376         __be32 *p;
3377 
3378         *res = 0;
3379         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3380                 return -EIO;
3381         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3382                 p = xdr_inline_decode(xdr, 4);
3383                 if (unlikely(!p))
3384                         return -EIO;
3385                 *res = be32_to_cpup(p);
3386                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3387         }
3388         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3389         return 0;
3390 }
3391 
3392 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3393 {
3394         __be32 *p;
3395         int ret = 0;
3396 
3397         fsid->major = 0;
3398         fsid->minor = 0;
3399         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3400                 return -EIO;
3401         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3402                 p = xdr_inline_decode(xdr, 16);
3403                 if (unlikely(!p))
3404                         return -EIO;
3405                 p = xdr_decode_hyper(p, &fsid->major);
3406                 xdr_decode_hyper(p, &fsid->minor);
3407                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3408                 ret = NFS_ATTR_FATTR_FSID;
3409         }
3410         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3411                         (unsigned long long)fsid->major,
3412                         (unsigned long long)fsid->minor);
3413         return ret;
3414 }
3415 
3416 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3417 {
3418         __be32 *p;
3419 
3420         *res = 60;
3421         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3422                 return -EIO;
3423         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3424                 p = xdr_inline_decode(xdr, 4);
3425                 if (unlikely(!p))
3426                         return -EIO;
3427                 *res = be32_to_cpup(p);
3428                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3429         }
3430         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3431         return 0;
3432 }
3433 
3434 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3435 {
3436         __be32 *p;
3437 
3438         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3439                 return -EIO;
3440         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3441                 p = xdr_inline_decode(xdr, 4);
3442                 if (unlikely(!p))
3443                         return -EIO;
3444                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3445                 *res = -be32_to_cpup(p);
3446         }
3447         return 0;
3448 }
3449 
3450 static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
3451                                  uint32_t *bitmap, uint32_t *bitmask)
3452 {
3453         if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
3454                 int ret;
3455                 ret = decode_attr_bitmap(xdr, bitmask);
3456                 if (unlikely(ret < 0))
3457                         return ret;
3458                 bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3459         } else
3460                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3461         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3462                 bitmask[0], bitmask[1], bitmask[2]);
3463         return 0;
3464 }
3465 
3466 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3467 {
3468         __be32 *p;
3469         u32 len;
3470 
3471         if (fh != NULL)
3472                 memset(fh, 0, sizeof(*fh));
3473 
3474         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3475                 return -EIO;
3476         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3477                 p = xdr_inline_decode(xdr, 4);
3478                 if (unlikely(!p))
3479                         return -EIO;
3480                 len = be32_to_cpup(p);
3481                 if (len > NFS4_FHSIZE)
3482                         return -EIO;
3483                 p = xdr_inline_decode(xdr, len);
3484                 if (unlikely(!p))
3485                         return -EIO;
3486                 if (fh != NULL) {
3487                         memcpy(fh->data, p, len);
3488                         fh->size = len;
3489                 }
3490                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3491         }
3492         return 0;
3493 }
3494 
3495 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3496 {
3497         __be32 *p;
3498 
3499         *res = 0;
3500         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3501                 return -EIO;
3502         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3503                 p = xdr_inline_decode(xdr, 4);
3504                 if (unlikely(!p))
3505                         return -EIO;
3506                 *res = be32_to_cpup(p);
3507                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3508         }
3509         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3510         return 0;
3511 }
3512 
3513 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3514 {
3515         __be32 *p;
3516         int ret = 0;
3517 
3518         *fileid = 0;
3519         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3520                 return -EIO;
3521         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3522                 p = xdr_inline_decode(xdr, 8);
3523                 if (unlikely(!p))
3524                         return -EIO;
3525                 xdr_decode_hyper(p, fileid);
3526                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3527                 ret = NFS_ATTR_FATTR_FILEID;
3528         }
3529         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3530         return ret;
3531 }
3532 
3533 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3534 {
3535         __be32 *p;
3536         int ret = 0;
3537 
3538         *fileid = 0;
3539         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3540                 return -EIO;
3541         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3542                 p = xdr_inline_decode(xdr, 8);
3543                 if (unlikely(!p))
3544                         return -EIO;
3545                 xdr_decode_hyper(p, fileid);
3546                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3547                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3548         }
3549         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3550         return ret;
3551 }
3552 
3553 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3554 {
3555         __be32 *p;
3556         int status = 0;
3557 
3558         *res = 0;
3559         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3560                 return -EIO;
3561         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3562                 p = xdr_inline_decode(xdr, 8);
3563                 if (unlikely(!p))
3564                         return -EIO;
3565                 xdr_decode_hyper(p, res);
3566                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3567         }
3568         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3569         return status;
3570 }
3571 
3572 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3573 {
3574         __be32 *p;
3575         int status = 0;
3576 
3577         *res = 0;
3578         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3579                 return -EIO;
3580         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3581                 p = xdr_inline_decode(xdr, 8);
3582                 if (unlikely(!p))
3583                         return -EIO;
3584                 xdr_decode_hyper(p, res);
3585                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3586         }
3587         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3588         return status;
3589 }
3590 
3591 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3592 {
3593         __be32 *p;
3594         int status = 0;
3595 
3596         *res = 0;
3597         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3598                 return -EIO;
3599         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3600                 p = xdr_inline_decode(xdr, 8);
3601                 if (unlikely(!p))
3602                         return -EIO;
3603                 xdr_decode_hyper(p, res);
3604                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3605         }
3606         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3607         return status;
3608 }
3609 
3610 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3611 {
3612         u32 n;
3613         __be32 *p;
3614         int status = 0;
3615 
3616         p = xdr_inline_decode(xdr, 4);
3617         if (unlikely(!p))
3618                 return -EIO;
3619         n = be32_to_cpup(p);
3620         if (n == 0)
3621                 goto root_path;
3622         dprintk("pathname4: ");
3623         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3624                 dprintk("cannot parse %d components in path\n", n);
3625                 goto out_eio;
3626         }
3627         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3628                 struct nfs4_string *component = &path->components[path->ncomponents];
3629                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3630                 if (unlikely(status != 0))
3631                         goto out_eio;
3632                 ifdebug (XDR)
3633                         pr_cont("%s%.*s ",
3634                                 (path->ncomponents != n ? "/ " : ""),
3635                                 component->len, component->data);
3636         }
3637 out:
3638         return status;
3639 root_path:
3640 /* a root pathname is sent as a zero component4 */
3641         path->ncomponents = 1;
3642         path->components[0].len=0;
3643         path->components[0].data=NULL;
3644         dprintk("pathname4: /\n");
3645         goto out;
3646 out_eio:
3647         dprintk(" status %d", status);
3648         status = -EIO;
3649         goto out;
3650 }
3651 
3652 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3653 {
3654         int n;
3655         __be32 *p;
3656         int status = -EIO;
3657 
3658         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3659                 goto out;
3660         status = 0;
3661         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3662                 goto out;
3663         bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
3664         status = -EIO;
3665         /* Ignore borken servers that return unrequested attrs */
3666         if (unlikely(res == NULL))
3667                 goto out;
3668         dprintk("%s: fsroot:\n", __func__);
3669         status = decode_pathname(xdr, &res->fs_path);
3670         if (unlikely(status != 0))
3671                 goto out;
3672         p = xdr_inline_decode(xdr, 4);
3673         if (unlikely(!p))
3674                 goto out_eio;
3675         n = be32_to_cpup(p);
3676         if (n <= 0)
3677                 goto out_eio;
3678         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3679                 u32 m;
3680                 struct nfs4_fs_location *loc;
3681 
3682                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3683                         break;
3684                 loc = &res->locations[res->nlocations];
3685                 p = xdr_inline_decode(xdr, 4);
3686                 if (unlikely(!p))
3687                         goto out_eio;
3688                 m = be32_to_cpup(p);
3689 
3690                 dprintk("%s: servers:\n", __func__);
3691                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3692                         struct nfs4_string *server;
3693 
3694                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3695                                 unsigned int i;
3696                                 dprintk("%s: using first %u of %u servers "
3697                                         "returned for location %u\n",
3698                                                 __func__,
3699                                                 NFS4_FS_LOCATION_MAXSERVERS,
3700                                                 m, res->nlocations);
3701                                 for (i = loc->nservers; i < m; i++) {
3702                                         unsigned int len;
3703                                         char *data;
3704                                         status = decode_opaque_inline(xdr, &len, &data);
3705                                         if (unlikely(status != 0))
3706                                                 goto out_eio;
3707                                 }
3708                                 break;
3709                         }
3710                         server = &loc->servers[loc->nservers];
3711                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3712                         if (unlikely(status != 0))
3713                                 goto out_eio;
3714                         dprintk("%s ", server->data);
3715                 }
3716                 status = decode_pathname(xdr, &loc->rootpath);
3717                 if (unlikely(status != 0))
3718                         goto out_eio;
3719         }
3720         if (res->nlocations != 0)
3721                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3722 out:
3723         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3724         return status;
3725 out_eio:
3726         status = -EIO;
3727         goto out;
3728 }
3729 
3730 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3731 {
3732         __be32 *p;
3733         int status = 0;
3734 
3735         *res = 0;
3736         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3737                 return -EIO;
3738         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3739                 p = xdr_inline_decode(xdr, 8);
3740                 if (unlikely(!p))
3741                         return -EIO;
3742                 xdr_decode_hyper(p, res);
3743                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3744         }
3745         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3746         return status;
3747 }
3748 
3749 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3750 {
3751         __be32 *p;
3752         int status = 0;
3753 
3754         *maxlink = 1;
3755         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3756                 return -EIO;
3757         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3758                 p = xdr_inline_decode(xdr, 4);
3759                 if (unlikely(!p))
3760                         return -EIO;
3761                 *maxlink = be32_to_cpup(p);
3762                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3763         }
3764         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3765         return status;
3766 }
3767 
3768 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3769 {
3770         __be32 *p;
3771         int status = 0;
3772 
3773         *maxname = 1024;
3774         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3775                 return -EIO;
3776         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3777                 p = xdr_inline_decode(xdr, 4);
3778                 if (unlikely(!p))
3779                         return -EIO;
3780                 *maxname = be32_to_cpup(p);
3781                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3782         }
3783         dprintk("%s: maxname=%u\n", __func__, *maxname);
3784         return status;
3785 }
3786 
3787 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3788 {
3789         __be32 *p;
3790         int status = 0;
3791 
3792         *res = 1024;
3793         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3794                 return -EIO;
3795         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3796                 uint64_t maxread;
3797                 p = xdr_inline_decode(xdr, 8);
3798                 if (unlikely(!p))
3799                         return -EIO;
3800                 xdr_decode_hyper(p, &maxread);
3801                 if (maxread > 0x7FFFFFFF)
3802                         maxread = 0x7FFFFFFF;
3803                 *res = (uint32_t)maxread;
3804                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3805         }
3806         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3807         return status;
3808 }
3809 
3810 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3811 {
3812         __be32 *p;
3813         int status = 0;
3814 
3815         *res = 1024;
3816         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3817                 return -EIO;
3818         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3819                 uint64_t maxwrite;
3820                 p = xdr_inline_decode(xdr, 8);
3821                 if (unlikely(!p))
3822                         return -EIO;
3823                 xdr_decode_hyper(p, &maxwrite);
3824                 if (maxwrite > 0x7FFFFFFF)
3825                         maxwrite = 0x7FFFFFFF;
3826                 *res = (uint32_t)maxwrite;
3827                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3828         }
3829         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3830         return status;
3831 }
3832 
3833 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3834 {
3835         uint32_t tmp;
3836         __be32 *p;
3837         int ret = 0;
3838 
3839         *mode = 0;
3840         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3841                 return -EIO;
3842         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3843                 p = xdr_inline_decode(xdr, 4);
3844                 if (unlikely(!p))
3845                         return -EIO;
3846                 tmp = be32_to_cpup(p);
3847                 *mode = tmp & ~S_IFMT;
3848                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3849                 ret = NFS_ATTR_FATTR_MODE;
3850         }
3851         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3852         return ret;
3853 }
3854 
3855 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3856 {
3857         __be32 *p;
3858         int ret = 0;
3859 
3860         *nlink = 1;
3861         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3862                 return -EIO;
3863         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3864                 p = xdr_inline_decode(xdr, 4);
3865                 if (unlikely(!p))
3866                         return -EIO;
3867                 *nlink = be32_to_cpup(p);
3868                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3869                 ret = NFS_ATTR_FATTR_NLINK;
3870         }
3871         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3872         return ret;
3873 }
3874 
3875 static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
3876                 struct nfs4_string *name, gfp_t gfp_flags)
3877 {
3878         ssize_t ret;
3879 
3880         ret = xdr_stream_decode_string_dup(xdr, &name->data,
3881                         XDR_MAX_NETOBJ, gfp_flags);
3882         name->len = 0;
3883         if (ret > 0)
3884                 name->len = ret;
3885         return ret;
3886 }
3887 
3888 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3889                 const struct nfs_server *server, kuid_t *uid,
3890                 struct nfs4_string *owner_name)
3891 {
3892         ssize_t len;
3893         char *p;
3894 
3895         *uid = make_kuid(&init_user_ns, -2);
3896         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3897                 return -EIO;
3898         if (!(bitmap[1] & FATTR4_WORD1_OWNER))
3899                 return 0;
3900         bitmap[1] &= ~FATTR4_WORD1_OWNER;
3901 
3902         if (owner_name != NULL) {
3903                 len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
3904                 if (len <= 0)
3905                         goto out;
3906                 dprintk("%s: name=%s\n", __func__, owner_name->data);
3907                 return NFS_ATTR_FATTR_OWNER_NAME;
3908         } else {
3909                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3910                                 XDR_MAX_NETOBJ);
3911                 if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
3912                         goto out;
3913                 dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
3914                 return NFS_ATTR_FATTR_OWNER;
3915         }
3916 out:
3917         if (len == -EBADMSG)
3918                 return -EIO;
3919         return 0;
3920 }
3921 
3922 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
3923                 const struct nfs_server *server, kgid_t *gid,
3924                 struct nfs4_string *group_name)
3925 {
3926         ssize_t len;
3927         char *p;
3928 
3929         *gid = make_kgid(&init_user_ns, -2);
3930         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
3931                 return -EIO;
3932         if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
3933                 return 0;
3934         bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
3935 
3936         if (group_name != NULL) {
3937                 len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
3938                 if (len <= 0)
3939                         goto out;
3940                 dprintk("%s: name=%s\n", __func__, group_name->data);
3941                 return NFS_ATTR_FATTR_GROUP_NAME;
3942         } else {
3943                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
3944                                 XDR_MAX_NETOBJ);
3945                 if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
3946                         goto out;
3947                 dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
3948                 return NFS_ATTR_FATTR_GROUP;
3949         }
3950 out:
3951         if (len == -EBADMSG)
3952                 return -EIO;
3953         return 0;
3954 }
3955 
3956 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
3957 {
3958         uint32_t major = 0, minor = 0;
3959         __be32 *p;
3960         int ret = 0;
3961 
3962         *rdev = MKDEV(0,0);
3963         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
3964                 return -EIO;
3965         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
3966                 dev_t tmp;
3967 
3968                 p = xdr_inline_decode(xdr, 8);
3969                 if (unlikely(!p))
3970                         return -EIO;
3971                 major = be32_to_cpup(p++);
3972                 minor = be32_to_cpup(p);
3973                 tmp = MKDEV(major, minor);
3974                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
3975                         *rdev = tmp;
3976                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
3977                 ret = NFS_ATTR_FATTR_RDEV;
3978         }
3979         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
3980         return ret;
3981 }
3982 
3983 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3984 {
3985         __be32 *p;
3986         int status = 0;
3987 
3988         *res = 0;
3989         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
3990                 return -EIO;
3991         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
3992                 p = xdr_inline_decode(xdr, 8);
3993                 if (unlikely(!p))
3994                         return -EIO;
3995                 xdr_decode_hyper(p, res);
3996                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
3997         }
3998         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
3999         return status;
4000 }
4001 
4002 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4003 {
4004         __be32 *p;
4005         int status = 0;
4006 
4007         *res = 0;
4008         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
4009                 return -EIO;
4010         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
4011                 p = xdr_inline_decode(xdr, 8);
4012                 if (unlikely(!p))
4013                         return -EIO;
4014                 xdr_decode_hyper(p, res);
4015                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
4016         }
4017         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
4018         return status;
4019 }
4020 
4021 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4022 {
4023         __be32 *p;
4024         int status = 0;
4025 
4026         *res = 0;
4027         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4028                 return -EIO;
4029         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4030                 p = xdr_inline_decode(xdr, 8);
4031                 if (unlikely(!p))
4032                         return -EIO;
4033                 xdr_decode_hyper(p, res);
4034                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4035         }
4036         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4037         return status;
4038 }
4039 
4040 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4041 {
4042         __be32 *p;
4043         int ret = 0;
4044 
4045         *used = 0;
4046         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4047                 return -EIO;
4048         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4049                 p = xdr_inline_decode(xdr, 8);
4050                 if (unlikely(!p))
4051                         return -EIO;
4052                 xdr_decode_hyper(p, used);
4053                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4054                 ret = NFS_ATTR_FATTR_SPACE_USED;
4055         }
4056         dprintk("%s: space used=%Lu\n", __func__,
4057                         (unsigned long long)*used);
4058         return ret;
4059 }
4060 
4061 static __be32 *
4062 xdr_decode_nfstime4(__be32 *p, struct timespec *t)
4063 {
4064         __u64 sec;
4065 
4066         p = xdr_decode_hyper(p, &sec);
4067         t-> tv_sec = (time_t)sec;
4068         t->tv_nsec = be32_to_cpup(p++);
4069         return p;
4070 }
4071 
4072 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4073 {
4074         __be32 *p;
4075 
4076         p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
4077         if (unlikely(!p))
4078                 return -EIO;
4079         xdr_decode_nfstime4(p, time);
4080         return 0;
4081 }
4082 
4083 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4084 {
4085         int status = 0;
4086 
4087         time->tv_sec = 0;
4088         time->tv_nsec = 0;
4089         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4090                 return -EIO;
4091         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4092                 status = decode_attr_time(xdr, time);
4093                 if (status == 0)
4094                         status = NFS_ATTR_FATTR_ATIME;
4095                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4096         }
4097         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4098         return status;
4099 }
4100 
4101 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4102 {
4103         int status = 0;
4104 
4105         time->tv_sec = 0;
4106         time->tv_nsec = 0;
4107         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4108                 return -EIO;
4109         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4110                 status = decode_attr_time(xdr, time);
4111                 if (status == 0)
4112                         status = NFS_ATTR_FATTR_CTIME;
4113                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4114         }
4115         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4116         return status;
4117 }
4118 
4119 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4120                                   struct timespec *time)
4121 {
4122         int status = 0;
4123 
4124         time->tv_sec = 0;
4125         time->tv_nsec = 0;
4126         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4127                 return -EIO;
4128         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4129                 status = decode_attr_time(xdr, time);
4130                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4131         }
4132         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4133                 (long)time->tv_nsec);
4134         return status;
4135 }
4136 
4137 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4138                                         struct nfs4_label *label)
4139 {
4140         uint32_t pi = 0;
4141         uint32_t lfs = 0;
4142         __u32 len;
4143         __be32 *p;
4144         int status = 0;
4145 
4146         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4147                 return -EIO;
4148         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4149                 p = xdr_inline_decode(xdr, 4);
4150                 if (unlikely(!p))
4151                         return -EIO;
4152                 lfs = be32_to_cpup(p++);
4153                 p = xdr_inline_decode(xdr, 4);
4154                 if (unlikely(!p))
4155                         return -EIO;
4156                 pi = be32_to_cpup(p++);
4157                 p = xdr_inline_decode(xdr, 4);
4158                 if (unlikely(!p))
4159                         return -EIO;
4160                 len = be32_to_cpup(p++);
4161                 p = xdr_inline_decode(xdr, len);
4162                 if (unlikely(!p))
4163                         return -EIO;
4164                 if (len < NFS4_MAXLABELLEN) {
4165                         if (label) {
4166                                 memcpy(label->label, p, len);
4167                                 label->len = len;
4168                                 label->pi = pi;
4169                                 label->lfs = lfs;
4170                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4171                         }
4172                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4173                 } else
4174                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4175                                         __func__, len);
4176         }
4177         if (label && label->label)
4178                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4179                         (char *)label->label, label->len, label->pi, label->lfs);
4180         return status;
4181 }
4182 
4183 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4184 {
4185         int status = 0;
4186 
4187         time->tv_sec = 0;
4188         time->tv_nsec = 0;
4189         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4190                 return -EIO;
4191         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4192                 status = decode_attr_time(xdr, time);
4193                 if (status == 0)
4194                         status = NFS_ATTR_FATTR_MTIME;
4195                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4196         }
4197         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4198         return status;
4199 }
4200 
4201 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4202 {
4203         unsigned int attrwords = XDR_QUADLEN(attrlen);
4204         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4205 
4206         if (unlikely(attrwords != nwords)) {
4207                 dprintk("%s: server returned incorrect attribute length: "
4208                         "%u %c %u\n",
4209                                 __func__,
4210                                 attrwords << 2,
4211                                 (attrwords < nwords) ? '<' : '>',
4212                                 nwords << 2);
4213                 return -EIO;
4214         }
4215         return 0;
4216 }
4217 
4218 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4219 {
4220         __be32 *p;
4221 
4222         p = xdr_inline_decode(xdr, 20);
4223         if (unlikely(!p))
4224                 return -EIO;
4225         cinfo->atomic = be32_to_cpup(p++);
4226         p = xdr_decode_hyper(p, &cinfo->before);
4227         xdr_decode_hyper(p, &cinfo->after);
4228         return 0;
4229 }
4230 
4231 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4232 {
4233         __be32 *p;
4234         uint32_t supp, acc;
4235         int status;
4236 
4237         status = decode_op_hdr(xdr, OP_ACCESS);
4238         if (status)
4239                 return status;
4240         p = xdr_inline_decode(xdr, 8);
4241         if (unlikely(!p))
4242                 return -EIO;
4243         supp = be32_to_cpup(p++);
4244         acc = be32_to_cpup(p);
4245         *supported = supp;
4246         *access = acc;
4247         return 0;
4248 }
4249 
4250 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4251 {
4252         ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
4253         if (unlikely(ret < 0))
4254                 return -EIO;
4255         return 0;
4256 }
4257 
4258 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4259 {
4260         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4261 }
4262 
4263 static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4264 {
4265         stateid->type = NFS4_OPEN_STATEID_TYPE;
4266         return decode_stateid(xdr, stateid);
4267 }
4268 
4269 static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4270 {
4271         stateid->type = NFS4_LOCK_STATEID_TYPE;
4272         return decode_stateid(xdr, stateid);
4273 }
4274 
4275 static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4276 {
4277         stateid->type = NFS4_DELEGATION_STATEID_TYPE;
4278         return decode_stateid(xdr, stateid);
4279 }
4280 
4281 static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4282 {
4283         nfs4_stateid dummy;
4284 
4285         nfs4_stateid_copy(stateid, &invalid_stateid);
4286         return decode_stateid(xdr, &dummy);
4287 }
4288 
4289 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4290 {
4291         int status;
4292 
4293         status = decode_op_hdr(xdr, OP_CLOSE);
4294         if (status != -EIO)
4295                 nfs_increment_open_seqid(status, res->seqid);
4296         if (!status)
4297                 status = decode_invalid_stateid(xdr, &res->stateid);
4298         return status;
4299 }
4300 
4301 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4302 {
4303         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4304 }
4305 
4306 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4307 {
4308         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4309 }
4310 
4311 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4312 {
4313         int status;
4314 
4315         status = decode_op_hdr(xdr, OP_COMMIT);
4316         if (!status)
4317                 status = decode_write_verifier(xdr, &res->verf->verifier);
4318         return status;
4319 }
4320 
4321 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4322 {
4323         __be32 *p;
4324         uint32_t bmlen;
4325         int status;
4326 
4327         status = decode_op_hdr(xdr, OP_CREATE);
4328         if (status)
4329                 return status;
4330         if ((status = decode_change_info(xdr, cinfo)))
4331                 return status;
4332         p = xdr_inline_decode(xdr, 4);
4333         if (unlikely(!p))
4334                 return -EIO;
4335         bmlen = be32_to_cpup(p);
4336         p = xdr_inline_decode(xdr, bmlen << 2);
4337         if (likely(p))
4338                 return 0;
4339         return -EIO;
4340 }
4341 
4342 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4343 {
4344         unsigned int savep;
4345         uint32_t attrlen, bitmap[3] = {0};
4346         int status;
4347 
4348         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4349                 goto xdr_error;
4350         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4351                 goto xdr_error;
4352         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4353                 goto xdr_error;
4354         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4355                 goto xdr_error;
4356         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4357                                                  &res->fh_expire_type)) != 0)
4358                 goto xdr_error;
4359         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4360                 goto xdr_error;
4361         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4362                 goto xdr_error;
4363         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4364                 goto xdr_error;
4365         if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
4366                                 res->exclcreat_bitmask)) != 0)
4367                 goto xdr_error;
4368         status = verify_attr_len(xdr, savep, attrlen);
4369 xdr_error:
4370         dprintk("%s: xdr returned %d!\n", __func__, -status);
4371         return status;
4372 }
4373 
4374 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4375 {
4376         unsigned int savep;
4377         uint32_t attrlen, bitmap[3] = {0};
4378         int status;
4379 
4380         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4381                 goto xdr_error;
4382         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4383                 goto xdr_error;
4384         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4385                 goto xdr_error;
4386 
4387         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4388                 goto xdr_error;
4389         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4390                 goto xdr_error;
4391         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4392                 goto xdr_error;
4393 
4394         status = -EIO;
4395         if (unlikely(bitmap[0]))
4396                 goto xdr_error;
4397 
4398         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4399                 goto xdr_error;
4400         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4401                 goto xdr_error;
4402         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4403                 goto xdr_error;
4404 
4405         status = verify_attr_len(xdr, savep, attrlen);
4406 xdr_error:
4407         dprintk("%s: xdr returned %d!\n", __func__, -status);
4408         return status;
4409 }
4410 
4411 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4412 {
4413         unsigned int savep;
4414         uint32_t attrlen, bitmap[3] = {0};
4415         int status;
4416 
4417         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4418                 goto xdr_error;
4419         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4420                 goto xdr_error;
4421         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4422                 goto xdr_error;
4423 
4424         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4425                 goto xdr_error;
4426         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4427                 goto xdr_error;
4428 
4429         status = verify_attr_len(xdr, savep, attrlen);
4430 xdr_error:
4431         dprintk("%s: xdr returned %d!\n", __func__, -status);
4432         return status;
4433 }
4434 
4435 static int decode_threshold_hint(struct xdr_stream *xdr,
4436                                   uint32_t *bitmap,
4437                                   uint64_t *res,
4438                                   uint32_t hint_bit)
4439 {
4440         __be32 *p;
4441 
4442         *res = 0;
4443         if (likely(bitmap[0] & hint_bit)) {
4444                 p = xdr_inline_decode(xdr, 8);
4445                 if (unlikely(!p))
4446                         return -EIO;
4447                 xdr_decode_hyper(p, res);
4448         }
4449         return 0;
4450 }
4451 
4452 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4453                                         struct nfs4_threshold *res)
4454 {
4455         __be32 *p;
4456         unsigned int savep;
4457         uint32_t bitmap[3] = {0,}, attrlen;
4458         int status;
4459 
4460         /* layout type */
4461         p = xdr_inline_decode(xdr, 4);
4462         if (unlikely(!p))
4463                 return -EIO;
4464         res->l_type = be32_to_cpup(p);
4465 
4466         /* thi_hintset bitmap */
4467         status = decode_attr_bitmap(xdr, bitmap);
4468         if (status < 0)
4469                 goto xdr_error;
4470 
4471         /* thi_hintlist length */
4472         status = decode_attr_length(xdr, &attrlen, &savep);
4473         if (status < 0)
4474                 goto xdr_error;
4475         /* thi_hintlist */
4476         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4477         if (status < 0)
4478                 goto xdr_error;
4479         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4480         if (status < 0)
4481                 goto xdr_error;
4482         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4483                                        THRESHOLD_RD_IO);
4484         if (status < 0)
4485                 goto xdr_error;
4486         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4487                                        THRESHOLD_WR_IO);
4488         if (status < 0)
4489                 goto xdr_error;
4490 
4491         status = verify_attr_len(xdr, savep, attrlen);
4492         res->bm = bitmap[0];
4493 
4494         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4495                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4496                 res->wr_io_sz);
4497 xdr_error:
4498         dprintk("%s ret=%d!\n", __func__, status);
4499         return status;
4500 }
4501 
4502 /*
4503  * Thresholds on pNFS direct I/O vrs MDS I/O
4504  */
4505 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4506                                     uint32_t *bitmap,
4507                                     struct nfs4_threshold *res)
4508 {
4509         __be32 *p;
4510         int status = 0;
4511         uint32_t num;
4512 
4513         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4514                 return -EIO;
4515         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4516                 /* Did the server return an unrequested attribute? */
4517                 if (unlikely(res == NULL))
4518                         return -EREMOTEIO;
4519                 p = xdr_inline_decode(xdr, 4);
4520                 if (unlikely(!p))
4521                         return -EIO;
4522                 num = be32_to_cpup(p);
4523                 if (num == 0)
4524                         return 0;
4525                 if (num > 1)
4526                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4527                                 "drivers per filesystem not supported\n",
4528                                 __func__);
4529 
4530                 status = decode_first_threshold_item4(xdr, res);
4531                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4532         }
4533         return status;
4534 }
4535 
4536 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4537                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4538                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4539                 const struct nfs_server *server)
4540 {
4541         int status;
4542         umode_t fmode = 0;
4543         uint32_t type;
4544         int32_t err;
4545 
4546         status = decode_attr_type(xdr, bitmap, &type);
4547         if (status < 0)
4548                 goto xdr_error;
4549         fattr->mode = 0;
4550         if (status != 0) {
4551                 fattr->mode |= nfs_type2fmt[type];
4552                 fattr->valid |= status;
4553         }
4554 
4555         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4556         if (status < 0)
4557                 goto xdr_error;
4558         fattr->valid |= status;
4559 
4560         status = decode_attr_size(xdr, bitmap, &fattr->size);
4561         if (status < 0)
4562                 goto xdr_error;
4563         fattr->valid |= status;
4564 
4565         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4566         if (status < 0)
4567                 goto xdr_error;
4568         fattr->valid |= status;
4569 
4570         err = 0;
4571         status = decode_attr_error(xdr, bitmap, &err);
4572         if (status < 0)
4573                 goto xdr_error;
4574 
4575         status = decode_attr_filehandle(xdr, bitmap, fh);
4576         if (status < 0)
4577                 goto xdr_error;
4578 
4579         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4580         if (status < 0)
4581                 goto xdr_error;
4582         fattr->valid |= status;
4583 
4584         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4585         if (status < 0)
4586                 goto xdr_error;
4587         fattr->valid |= status;
4588 
4589         status = -EIO;
4590         if (unlikely(bitmap[0]))
4591                 goto xdr_error;
4592 
4593         status = decode_attr_mode(xdr, bitmap, &fmode);
4594         if (status < 0)
4595                 goto xdr_error;
4596         if (status != 0) {
4597                 fattr->mode |= fmode;
4598                 fattr->valid |= status;
4599         }
4600 
4601         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4602         if (status < 0)
4603                 goto xdr_error;
4604         fattr->valid |= status;
4605 
4606         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4607         if (status < 0)
4608                 goto xdr_error;
4609         fattr->valid |= status;
4610 
4611         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4612         if (status < 0)
4613                 goto xdr_error;
4614         fattr->valid |= status;
4615 
4616         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4617         if (status < 0)
4618                 goto xdr_error;
4619         fattr->valid |= status;
4620 
4621         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4622         if (status < 0)
4623                 goto xdr_error;
4624         fattr->valid |= status;
4625 
4626         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4627         if (status < 0)
4628                 goto xdr_error;
4629         fattr->valid |= status;
4630 
4631         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4632         if (status < 0)
4633                 goto xdr_error;
4634         fattr->valid |= status;
4635 
4636         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4637         if (status < 0)
4638                 goto xdr_error;
4639         fattr->valid |= status;
4640 
4641         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4642         if (status < 0)
4643                 goto xdr_error;
4644         fattr->valid |= status;
4645 
4646         status = -EIO;
4647         if (unlikely(bitmap[1]))
4648                 goto xdr_error;
4649 
4650         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4651         if (status < 0)
4652                 goto xdr_error;
4653 
4654         if (label) {
4655                 status = decode_attr_security_label(xdr, bitmap, label);
4656                 if (status < 0)
4657                         goto xdr_error;
4658                 fattr->valid |= status;
4659         }
4660 
4661 xdr_error:
4662         dprintk("%s: xdr returned %d\n", __func__, -status);
4663         return status;
4664 }
4665 
4666 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4667                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4668                 struct nfs4_label *label, const struct nfs_server *server)
4669 {
4670         unsigned int savep;
4671         uint32_t attrlen,
4672                  bitmap[3] = {0};
4673         int status;
4674 
4675         status = decode_op_hdr(xdr, OP_GETATTR);
4676         if (status < 0)
4677                 goto xdr_error;
4678 
4679         status = decode_attr_bitmap(xdr, bitmap);
4680         if (status < 0)
4681                 goto xdr_error;
4682 
4683         status = decode_attr_length(xdr, &attrlen, &savep);
4684         if (status < 0)
4685                 goto xdr_error;
4686 
4687         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4688                                         label, server);
4689         if (status < 0)
4690                 goto xdr_error;
4691 
4692         status = verify_attr_len(xdr, savep, attrlen);
4693 xdr_error:
4694         dprintk("%s: xdr returned %d\n", __func__, -status);
4695         return status;
4696 }
4697 
4698 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4699                 struct nfs4_label *label, const struct nfs_server *server)
4700 {
4701         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4702 }
4703 
4704 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4705                 const struct nfs_server *server)
4706 {
4707         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4708 }
4709 
4710 /*
4711  * Decode potentially multiple layout types.
4712  */
4713 static int decode_pnfs_layout_types(struct xdr_stream *xdr,
4714                                     struct nfs_fsinfo *fsinfo)
4715 {
4716         __be32 *p;
4717         uint32_t i;
4718 
4719         p = xdr_inline_decode(xdr, 4);
4720         if (unlikely(!p))
4721                 return -EIO;
4722         fsinfo->nlayouttypes = be32_to_cpup(p);
4723 
4724         /* pNFS is not supported by the underlying file system */
4725         if (fsinfo->nlayouttypes == 0)
4726                 return 0;
4727 
4728         /* Decode and set first layout type, move xdr->p past unused types */
4729         p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
4730         if (unlikely(!p))
4731                 return -EIO;
4732 
4733         /* If we get too many, then just cap it at the max */
4734         if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
4735                 printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
4736                         __func__, fsinfo->nlayouttypes);
4737                 fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
4738         }
4739 
4740         for(i = 0; i < fsinfo->nlayouttypes; ++i)
4741                 fsinfo->layouttype[i] = be32_to_cpup(p++);
4742         return 0;
4743 }
4744 
4745 /*
4746  * The type of file system exported.
4747  * Note we must ensure that layouttype is set in any non-error case.
4748  */
4749 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4750                                 struct nfs_fsinfo *fsinfo)
4751 {
4752         int status = 0;
4753 
4754         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4755         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4756                 return -EIO;
4757         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4758                 status = decode_pnfs_layout_types(xdr, fsinfo);
4759                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4760         }
4761         return status;
4762 }
4763 
4764 /*
4765  * The prefered block size for layout directed io
4766  */
4767 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4768                                       uint32_t *res)
4769 {
4770         __be32 *p;
4771 
4772         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4773         *res = 0;
4774         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4775                 p = xdr_inline_decode(xdr, 4);
4776                 if (unlikely(!p))
4777                         return -EIO;
4778                 *res = be32_to_cpup(p);
4779                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4780         }
4781         return 0;
4782 }
4783 
4784 /*
4785  * The granularity of a CLONE operation.
4786  */
4787 static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4788                                      uint32_t *res)
4789 {
4790         __be32 *p;
4791 
4792         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4793         *res = 0;
4794         if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
4795                 p = xdr_inline_decode(xdr, 4);
4796                 if (unlikely(!p))
4797                         return -EIO;
4798                 *res = be32_to_cpup(p);
4799                 bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
4800         }
4801         return 0;
4802 }
4803 
4804 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4805 {
4806         unsigned int savep;
4807         uint32_t attrlen, bitmap[3];
4808         int status;
4809 
4810         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4811                 goto xdr_error;
4812         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4813                 goto xdr_error;
4814         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4815                 goto xdr_error;
4816 
4817         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4818 
4819         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4820                 goto xdr_error;
4821         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4822                 goto xdr_error;
4823         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4824                 goto xdr_error;
4825         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4826         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4827                 goto xdr_error;
4828         fsinfo->wtpref = fsinfo->wtmax;
4829 
4830         status = -EIO;
4831         if (unlikely(bitmap[0]))
4832                 goto xdr_error;
4833 
4834         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4835         if (status != 0)
4836                 goto xdr_error;
4837         status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
4838         if (status != 0)
4839                 goto xdr_error;
4840 
4841         status = -EIO;
4842         if (unlikely(bitmap[1]))
4843                 goto xdr_error;
4844 
4845         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4846         if (status)
4847                 goto xdr_error;
4848         status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
4849         if (status)
4850                 goto xdr_error;
4851 
4852         status = verify_attr_len(xdr, savep, attrlen);
4853 xdr_error:
4854         dprintk("%s: xdr returned %d!\n", __func__, -status);
4855         return status;
4856 }
4857 
4858 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
4859 {
4860         __be32 *p;
4861         uint32_t len;
4862         int status;
4863 
4864         /* Zero handle first to allow comparisons */
4865         memset(fh, 0, sizeof(*fh));
4866 
4867         status = decode_op_hdr(xdr, OP_GETFH);
4868         if (status)
4869                 return status;
4870 
4871         p = xdr_inline_decode(xdr, 4);
4872         if (unlikely(!p))
4873                 return -EIO;
4874         len = be32_to_cpup(p);
4875         if (len > NFS4_FHSIZE)
4876                 return -EIO;
4877         fh->size = len;
4878         p = xdr_inline_decode(xdr, len);
4879         if (unlikely(!p))
4880                 return -EIO;
4881         memcpy(fh->data, p, len);
4882         return 0;
4883 }
4884 
4885 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4886 {
4887         int status;
4888 
4889         status = decode_op_hdr(xdr, OP_LINK);
4890         if (status)
4891                 return status;
4892         return decode_change_info(xdr, cinfo);
4893 }
4894 
4895 /*
4896  * We create the owner, so we know a proper owner.id length is 4.
4897  */
4898 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
4899 {
4900         uint64_t offset, length, clientid;
4901         __be32 *p;
4902         uint32_t namelen, type;
4903 
4904         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
4905         if (unlikely(!p))
4906                 return -EIO;
4907         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
4908         p = xdr_decode_hyper(p, &length);
4909         type = be32_to_cpup(p++); /* 4 byte read */
4910         if (fl != NULL) { /* manipulate file lock */
4911                 fl->fl_start = (loff_t)offset;
4912                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
4913                 if (length == ~(uint64_t)0)
4914                         fl->fl_end = OFFSET_MAX;
4915                 fl->fl_type = F_WRLCK;
4916                 if (type & 1)
4917                         fl->fl_type = F_RDLCK;
4918                 fl->fl_pid = 0;
4919         }
4920         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
4921         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
4922         p = xdr_inline_decode(xdr, namelen); /* variable size field */
4923         if (likely(!p))
4924                 return -EIO;
4925         return -NFS4ERR_DENIED;
4926 }
4927 
4928 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
4929 {
4930         int status;
4931 
4932         status = decode_op_hdr(xdr, OP_LOCK);
4933         if (status == -EIO)
4934                 goto out;
4935         if (status == 0) {
4936                 status = decode_lock_stateid(xdr, &res->stateid);
4937                 if (unlikely(status))
4938                         goto out;
4939         } else if (status == -NFS4ERR_DENIED)
4940                 status = decode_lock_denied(xdr, NULL);
4941         if (res->open_seqid != NULL)
4942                 nfs_increment_open_seqid(status, res->open_seqid);
4943         nfs_increment_lock_seqid(status, res->lock_seqid);
4944 out:
4945         return status;
4946 }
4947 
4948 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
4949 {
4950         int status;
4951         status = decode_op_hdr(xdr, OP_LOCKT);
4952         if (status == -NFS4ERR_DENIED)
4953                 return decode_lock_denied(xdr, res->denied);
4954         return status;
4955 }
4956 
4957 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
4958 {
4959         int status;
4960 
4961         status = decode_op_hdr(xdr, OP_LOCKU);
4962         if (status != -EIO)
4963                 nfs_increment_lock_seqid(status, res->seqid);
4964         if (status == 0)
4965                 status = decode_lock_stateid(xdr, &res->stateid);
4966         return status;
4967 }
4968 
4969 static int decode_release_lockowner(struct xdr_stream *xdr)
4970 {
4971         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
4972 }
4973 
4974 static int decode_lookup(struct xdr_stream *xdr)
4975 {
4976         return decode_op_hdr(xdr, OP_LOOKUP);
4977 }
4978 
4979 static int decode_lookupp(struct xdr_stream *xdr)
4980 {
4981         return decode_op_hdr(xdr, OP_LOOKUPP);
4982 }
4983 
4984 /* This is too sick! */
4985 static int decode_space_limit(struct xdr_stream *xdr,
4986                 unsigned long *pagemod_limit)
4987 {
4988         __be32 *p;
4989         uint32_t limit_type, nblocks, blocksize;
4990         u64 maxsize = 0;
4991 
4992         p = xdr_inline_decode(xdr, 12);
4993         if (unlikely(!p))
4994                 return -EIO;
4995         limit_type = be32_to_cpup(p++);
4996         switch (limit_type) {
4997         case NFS4_LIMIT_SIZE:
4998                 xdr_decode_hyper(p, &maxsize);
4999                 break;
5000         case NFS4_LIMIT_BLOCKS:
5001                 nblocks = be32_to_cpup(p++);
5002                 blocksize = be32_to_cpup(p);
5003                 maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
5004         }
5005         maxsize >>= PAGE_SHIFT;
5006         *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
5007         return 0;
5008 }
5009 
5010 static int decode_rw_delegation(struct xdr_stream *xdr,
5011                 uint32_t delegation_type,
5012                 struct nfs_openres *res)
5013 {
5014         __be32 *p;
5015         int status;
5016 
5017         status = decode_delegation_stateid(xdr, &res->delegation);
5018         if (unlikely(status))
5019                 return status;
5020         p = xdr_inline_decode(xdr, 4);
5021         if (unlikely(!p))
5022                 return -EIO;
5023         res->do_recall = be32_to_cpup(p);
5024 
5025         switch (delegation_type) {
5026         case NFS4_OPEN_DELEGATE_READ:
5027                 res->delegation_type = FMODE_READ;
5028                 break;
5029         case NFS4_OPEN_DELEGATE_WRITE:
5030                 res->delegation_type = FMODE_WRITE|FMODE_READ;
5031                 if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
5032                                 return -EIO;
5033         }
5034         return decode_ace(xdr, NULL);
5035 }
5036 
5037 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5038 {
5039         __be32 *p;
5040         uint32_t why_no_delegation;
5041 
5042         p = xdr_inline_decode(xdr, 4);
5043         if (unlikely(!p))
5044                 return -EIO;
5045         why_no_delegation = be32_to_cpup(p);
5046         switch (why_no_delegation) {
5047                 case WND4_CONTENTION:
5048                 case WND4_RESOURCE:
5049                         xdr_inline_decode(xdr, 4);
5050                         /* Ignore for now */
5051         }
5052         return 0;
5053 }
5054 
5055 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5056 {
5057         __be32 *p;
5058         uint32_t delegation_type;
5059 
5060         p = xdr_inline_decode(xdr, 4);
5061         if (unlikely(!p))
5062                 return -EIO;
5063         delegation_type = be32_to_cpup(p);
5064         res->delegation_type = 0;
5065         switch (delegation_type) {
5066         case NFS4_OPEN_DELEGATE_NONE:
5067                 return 0;
5068         case NFS4_OPEN_DELEGATE_READ:
5069         case NFS4_OPEN_DELEGATE_WRITE:
5070                 return decode_rw_delegation(xdr, delegation_type, res);
5071         case NFS4_OPEN_DELEGATE_NONE_EXT:
5072                 return decode_no_delegation(xdr, res);
5073         }
5074         return -EIO;
5075 }
5076 
5077 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5078 {
5079         __be32 *p;
5080         uint32_t savewords, bmlen, i;
5081         int status;
5082 
5083         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5084                 return status;
5085         nfs_increment_open_seqid(status, res->seqid);
5086         if (status)
5087                 return status;
5088         status = decode_open_stateid(xdr, &res->stateid);
5089         if (unlikely(status))
5090                 return status;
5091 
5092         decode_change_info(xdr, &res->cinfo);
5093 
5094         p = xdr_inline_decode(xdr, 8);
5095         if (unlikely(!p))
5096                 return -EIO;
5097         res->rflags = be32_to_cpup(p++);
5098         bmlen = be32_to_cpup(p);
5099         if (bmlen > 10)
5100                 goto xdr_error;
5101 
5102         p = xdr_inline_decode(xdr, bmlen << 2);
5103         if (unlikely(!p))
5104                 return -EIO;
5105         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5106         for (i = 0; i < savewords; ++i)
5107                 res->attrset[i] = be32_to_cpup(p++);
5108         for (; i < NFS4_BITMAP_SIZE; i++)
5109                 res->attrset[i] = 0;
5110 
5111         return decode_delegation(xdr, res);
5112 xdr_error:
5113         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5114         return -EIO;
5115 }
5116 
5117 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5118 {
5119         int status;
5120 
5121         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5122         if (status != -EIO)
5123                 nfs_increment_open_seqid(status, res->seqid);
5124         if (!status)
5125                 status = decode_open_stateid(xdr, &res->stateid);
5126         return status;
5127 }
5128 
5129 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5130 {
5131         int status;
5132 
5133         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5134         if (status != -EIO)
5135                 nfs_increment_open_seqid(status, res->seqid);
5136         if (!status)
5137                 status = decode_open_stateid(xdr, &res->stateid);
5138         return status;
5139 }
5140 
5141 static int decode_putfh(struct xdr_stream *xdr)
5142 {
5143         return decode_op_hdr(xdr, OP_PUTFH);
5144 }
5145 
5146 static int decode_putrootfh(struct xdr_stream *xdr)
5147 {
5148         return decode_op_hdr(xdr, OP_PUTROOTFH);
5149 }
5150 
5151 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5152                        struct nfs_pgio_res *res)
5153 {
5154         __be32 *p;
5155         uint32_t count, eof, recvd;
5156         int status;
5157 
5158         status = decode_op_hdr(xdr, OP_READ);
5159         if (status)
5160                 return status;
5161         p = xdr_inline_decode(xdr, 8);
5162         if (unlikely(!p))
5163                 return -EIO;
5164         eof = be32_to_cpup(p++);
5165         count = be32_to_cpup(p);
5166         recvd = xdr_read_pages(xdr, count);
5167         if (count > recvd) {
5168                 dprintk("NFS: server cheating in read reply: "
5169                                 "count %u > recvd %u\n", count, recvd);
5170                 count = recvd;
5171                 eof = 0;
5172         }
5173         res->eof = eof;
5174         res->count = count;
5175         return 0;
5176 }
5177 
5178 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5179 {
5180         int             status;
5181         __be32          verf[2];
5182 
5183         status = decode_op_hdr(xdr, OP_READDIR);
5184         if (!status)
5185                 status = decode_verifier(xdr, readdir->verifier.data);
5186         if (unlikely(status))
5187                 return status;
5188         memcpy(verf, readdir->verifier.data, sizeof(verf));
5189         dprintk("%s: verifier = %08x:%08x\n",
5190                         __func__, verf[0], verf[1]);
5191         return xdr_read_pages(xdr, xdr->buf->page_len);
5192 }
5193 
5194 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5195 {
5196         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5197         u32 len, recvd;
5198         __be32 *p;
5199         int status;
5200 
5201         status = decode_op_hdr(xdr, OP_READLINK);
5202         if (status)
5203                 return status;
5204 
5205         /* Convert length of symlink */
5206         p = xdr_inline_decode(xdr, 4);
5207         if (unlikely(!p))
5208                 return -EIO;
5209         len = be32_to_cpup(p);
5210         if (len >= rcvbuf->page_len || len <= 0) {
5211                 dprintk("nfs: server returned giant symlink!\n");
5212                 return -ENAMETOOLONG;
5213         }
5214         recvd = xdr_read_pages(xdr, len);
5215         if (recvd < len) {
5216                 dprintk("NFS: server cheating in readlink reply: "
5217                                 "count %u > recvd %u\n", len, recvd);
5218                 return -EIO;
5219         }
5220         /*
5221          * The XDR encode routine has set things up so that
5222          * the link text will be copied directly into the
5223          * buffer.  We just have to do overflow-checking,
5224          * and and null-terminate the text (the VFS expects
5225          * null-termination).
5226          */
5227         xdr_terminate_string(rcvbuf, len);
5228         return 0;
5229 }
5230 
5231 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5232 {
5233         int status;
5234 
5235         status = decode_op_hdr(xdr, OP_REMOVE);
5236         if (status)
5237                 goto out;
5238         status = decode_change_info(xdr, cinfo);
5239 out:
5240         return status;
5241 }
5242 
5243 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5244               struct nfs4_change_info *new_cinfo)
5245 {
5246         int status;
5247 
5248         status = decode_op_hdr(xdr, OP_RENAME);
5249         if (status)
5250                 goto out;
5251         if ((status = decode_change_info(xdr, old_cinfo)))
5252                 goto out;
5253         status = decode_change_info(xdr, new_cinfo);
5254 out:
5255         return status;
5256 }
5257 
5258 static int decode_renew(struct xdr_stream *xdr)
5259 {
5260         return decode_op_hdr(xdr, OP_RENEW);
5261 }
5262 
5263 static int
5264 decode_restorefh(struct xdr_stream *xdr)
5265 {
5266         return decode_op_hdr(xdr, OP_RESTOREFH);
5267 }
5268 
5269 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5270                          struct nfs_getaclres *res)
5271 {
5272         unsigned int savep;
5273         uint32_t attrlen,
5274                  bitmap[3] = {0};
5275         int status;
5276         unsigned int pg_offset;
5277 
5278         res->acl_len = 0;
5279         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5280                 goto out;
5281 
5282         xdr_enter_page(xdr, xdr->buf->page_len);
5283 
5284         /* Calculate the offset of the page data */
5285         pg_offset = xdr->buf->head[0].iov_len;
5286 
5287         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5288                 goto out;
5289         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5290                 goto out;
5291 
5292         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5293                 return -EIO;
5294         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5295 
5296                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5297                  * are stored with the acl data to handle the problem of
5298                  * variable length bitmaps.*/
5299                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5300                 res->acl_len = attrlen;
5301 
5302                 /* Check for receive buffer overflow */
5303                 if (res->acl_len > (xdr->nwords << 2) ||
5304                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5305                         res->acl_flags |= NFS4_ACL_TRUNC;
5306                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5307                                         attrlen, xdr->nwords << 2);
5308                 }
5309         } else
5310                 status = -EOPNOTSUPP;
5311 
5312 out:
5313         return status;
5314 }
5315 
5316 static int
5317 decode_savefh(struct xdr_stream *xdr)
5318 {
5319         return decode_op_hdr(xdr, OP_SAVEFH);
5320 }
5321 
5322 static int decode_setattr(struct xdr_stream *xdr)
5323 {
5324         int status;
5325 
5326         status = decode_op_hdr(xdr, OP_SETATTR);
5327         if (status)
5328                 return status;
5329         if (decode_bitmap4(xdr, NULL, 0) >= 0)
5330                 return 0;
5331         return -EIO;
5332 }
5333 
5334 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5335 {
5336         __be32 *p;
5337         uint32_t opnum;
5338         int32_t nfserr;
5339 
5340         p = xdr_inline_decode(xdr, 8);
5341         if (unlikely(!p))
5342                 return -EIO;
5343         opnum = be32_to_cpup(p++);
5344         if (opnum != OP_SETCLIENTID) {
5345                 dprintk("nfs: decode_setclientid: Server returned operation"
5346                         " %d\n", opnum);
5347                 return -EIO;
5348         }
5349         nfserr = be32_to_cpup(p);
5350         if (nfserr == NFS_OK) {
5351                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5352                 if (unlikely(!p))
5353                         return -EIO;
5354                 p = xdr_decode_hyper(p, &res->clientid);
5355                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5356         } else if (nfserr == NFSERR_CLID_INUSE) {
5357                 uint32_t len;
5358 
5359                 /* skip netid string */
5360                 p = xdr_inline_decode(xdr, 4);
5361                 if (unlikely(!p))
5362                         return -EIO;
5363                 len = be32_to_cpup(p);
5364                 p = xdr_inline_decode(xdr, len);
5365                 if (unlikely(!p))
5366                         return -EIO;
5367 
5368                 /* skip uaddr string */
5369                 p = xdr_inline_decode(xdr, 4);
5370                 if (unlikely(!p))
5371                         return -EIO;
5372                 len = be32_to_cpup(p);
5373                 p = xdr_inline_decode(xdr, len);
5374                 if (unlikely(!p))
5375                         return -EIO;
5376                 return -NFSERR_CLID_INUSE;
5377         } else
5378                 return nfs4_stat_to_errno(nfserr);
5379 
5380         return 0;
5381 }
5382 
5383 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5384 {
5385         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5386 }
5387 
5388 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5389 {
5390         __be32 *p;
5391         int status;
5392 
5393         status = decode_op_hdr(xdr, OP_WRITE);
5394         if (status)
5395                 return status;
5396 
5397         p = xdr_inline_decode(xdr, 8);
5398         if (unlikely(!p))
5399                 return -EIO;
5400         res->count = be32_to_cpup(p++);
5401         res->verf->committed = be32_to_cpup(p++);
5402         return decode_write_verifier(xdr, &res->verf->verifier);
5403 }
5404 
5405 static int decode_delegreturn(struct xdr_stream *xdr)
5406 {
5407         return decode_op_hdr(xdr, OP_DELEGRETURN);
5408 }
5409 
5410 static int decode_secinfo_gss(struct xdr_stream *xdr,
5411                               struct nfs4_secinfo4 *flavor)
5412 {
5413         u32 oid_len;
5414         __be32 *p;
5415 
5416         p = xdr_inline_decode(xdr, 4);
5417         if (unlikely(!p))
5418                 return -EIO;
5419         oid_len = be32_to_cpup(p);
5420         if (oid_len > GSS_OID_MAX_LEN)
5421                 return -EINVAL;
5422 
5423         p = xdr_inline_decode(xdr, oid_len);
5424         if (unlikely(!p))
5425                 return -EIO;
5426         memcpy(flavor->flavor_info.oid.data, p, oid_len);
5427         flavor->flavor_info.oid.len = oid_len;
5428 
5429         p = xdr_inline_decode(xdr, 8);
5430         if (unlikely(!p))
5431                 return -EIO;
5432         flavor->flavor_info.qop = be32_to_cpup(p++);
5433         flavor->flavor_info.service = be32_to_cpup(p);
5434 
5435         return 0;
5436 }
5437 
5438 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5439 {
5440         struct nfs4_secinfo4 *sec_flavor;
5441         unsigned int i, num_flavors;
5442         int status;
5443         __be32 *p;
5444 
5445         p = xdr_inline_decode(xdr, 4);
5446         if (unlikely(!p))
5447                 return -EIO;
5448 
5449         res->flavors->num_flavors = 0;
5450         num_flavors = be32_to_cpup(p);
5451 
5452         for (i = 0; i < num_flavors; i++) {
5453                 sec_flavor = &res->flavors->flavors[i];
5454                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5455                         break;
5456 
5457                 p = xdr_inline_decode(xdr, 4);
5458                 if (unlikely(!p))
5459                         return -EIO;
5460                 sec_flavor->flavor = be32_to_cpup(p);
5461 
5462                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5463                         status = decode_secinfo_gss(xdr, sec_flavor);
5464                         if (status)
5465                                 goto out;
5466                 }
5467                 res->flavors->num_flavors++;
5468         }
5469 
5470         status = 0;
5471 out:
5472         return status;
5473 }
5474 
5475 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5476 {
5477         int status = decode_op_hdr(xdr, OP_SECINFO);
5478         if (status)
5479                 return status;
5480         return decode_secinfo_common(xdr, res);
5481 }
5482 
5483 #if defined(CONFIG_NFS_V4_1)
5484 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5485 {
5486         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5487         if (status)
5488                 return status;
5489         return decode_secinfo_common(xdr, res);
5490 }
5491 
5492 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5493 {
5494         __be32 *p;
5495         uint32_t bitmap_words;
5496         unsigned int i;
5497 
5498         p = xdr_inline_decode(xdr, 4);
5499         if (!p)
5500                 return -EIO;
5501         bitmap_words = be32_to_cpup(p++);
5502         if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5503                 return -EIO;
5504         p = xdr_inline_decode(xdr, 4 * bitmap_words);
5505         for (i = 0; i < bitmap_words; i++)
5506                 op_map->u.words[i] = be32_to_cpup(p++);
5507 
5508         return 0;
5509 }
5510 
5511 static int decode_exchange_id(struct xdr_stream *xdr,
5512                               struct nfs41_exchange_id_res *res)
5513 {
5514         __be32 *p;
5515         uint32_t dummy;
5516         char *dummy_str;
5517         int status;
5518         uint32_t impl_id_count;
5519 
5520         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5521         if (status)
5522                 return status;
5523 
5524         p = xdr_inline_decode(xdr, 8);
5525         if (unlikely(!p))
5526                 return -EIO;
5527         xdr_decode_hyper(p, &res->clientid);
5528         p = xdr_inline_decode(xdr, 12);
5529         if (unlikely(!p))
5530                 return -EIO;
5531         res->seqid = be32_to_cpup(p++);
5532         res->flags = be32_to_cpup(p++);
5533 
5534         res->state_protect.how = be32_to_cpup(p);
5535         switch (res->state_protect.how) {
5536         case SP4_NONE:
5537                 break;
5538         case SP4_MACH_CRED:
5539                 status = decode_op_map(xdr, &res->state_protect.enforce);
5540                 if (status)
5541                         return status;
5542                 status = decode_op_map(xdr, &res->state_protect.allow);
5543                 if (status)
5544                         return status;
5545                 break;
5546         default:
5547                 WARN_ON_ONCE(1);
5548                 return -EIO;
5549         }
5550 
5551         /* server_owner4.so_minor_id */
5552         p = xdr_inline_decode(xdr, 8);
5553         if (unlikely(!p))
5554                 return -EIO;
5555         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5556 
5557         /* server_owner4.so_major_id */
5558         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5559         if (unlikely(status))
5560                 return status;
5561         memcpy(res->server_owner->major_id, dummy_str, dummy);
5562         res->server_owner->major_id_sz = dummy;
5563 
5564         /* server_scope4 */
5565         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5566         if (unlikely(status))
5567                 return status;
5568         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5569         res->server_scope->server_scope_sz = dummy;
5570 
5571         /* Implementation Id */
5572         p = xdr_inline_decode(xdr, 4);
5573         if (unlikely(!p))
5574                 return -EIO;
5575         impl_id_count = be32_to_cpup(p++);
5576 
5577         if (impl_id_count) {
5578                 /* nii_domain */
5579                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5580                 if (unlikely(status))
5581                         return status;
5582                 memcpy(res->impl_id->domain, dummy_str, dummy);
5583 
5584                 /* nii_name */
5585                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5586                 if (unlikely(status))
5587                         return status;
5588                 memcpy(res->impl_id->name, dummy_str, dummy);
5589 
5590                 /* nii_date */
5591                 p = xdr_inline_decode(xdr, 12);
5592                 if (unlikely(!p))
5593                         return -EIO;
5594                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5595                 res->impl_id->date.nseconds = be32_to_cpup(p);
5596 
5597                 /* if there's more than one entry, ignore the rest */
5598         }
5599         return 0;
5600 }
5601 
5602 static int decode_chan_attrs(struct xdr_stream *xdr,
5603                              struct nfs4_channel_attrs *attrs)
5604 {
5605         __be32 *p;
5606         u32 nr_attrs, val;
5607 
5608         p = xdr_inline_decode(xdr, 28);
5609         if (unlikely(!p))
5610                 return -EIO;
5611         val = be32_to_cpup(p++);        /* headerpadsz */
5612         if (val)
5613                 return -EINVAL;         /* no support for header padding yet */
5614         attrs->max_rqst_sz = be32_to_cpup(p++);
5615         attrs->max_resp_sz = be32_to_cpup(p++);
5616         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5617         attrs->max_ops = be32_to_cpup(p++);
5618         attrs->max_reqs = be32_to_cpup(p++);
5619         nr_attrs = be32_to_cpup(p);
5620         if (unlikely(nr_attrs > 1)) {
5621                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5622                         "count %u\n", __func__, nr_attrs);
5623                 return -EINVAL;
5624         }
5625         if (nr_attrs == 1) {
5626                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5627                 if (unlikely(!p))
5628                         return -EIO;
5629         }
5630         return 0;
5631 }
5632 
5633 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5634 {
5635         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5636 }
5637 
5638 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5639                                 struct nfs41_bind_conn_to_session_res *res)
5640 {
5641         __be32 *p;
5642         int status;
5643 
5644         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5645         if (!status)
5646                 status = decode_sessionid(xdr, &res->sessionid);
5647         if (unlikely(status))
5648                 return status;
5649 
5650         /* dir flags, rdma mode bool */
5651         p = xdr_inline_decode(xdr, 8);
5652         if (unlikely(!p))
5653                 return -EIO;
5654 
5655         res->dir = be32_to_cpup(p++);
5656         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5657                 return -EIO;
5658         if (be32_to_cpup(p) == 0)
5659                 res->use_conn_in_rdma_mode = false;
5660         else
5661                 res->use_conn_in_rdma_mode = true;
5662 
5663         return 0;
5664 }
5665 
5666 static int decode_create_session(struct xdr_stream *xdr,
5667                                  struct nfs41_create_session_res *res)
5668 {
5669         __be32 *p;
5670         int status;
5671 
5672         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5673         if (!status)
5674                 status = decode_sessionid(xdr, &res->sessionid);
5675         if (unlikely(status))
5676                 return status;
5677 
5678         /* seqid, flags */
5679         p = xdr_inline_decode(xdr, 8);
5680         if (unlikely(!p))
5681                 return -EIO;
5682         res->seqid = be32_to_cpup(p++);
5683         res->flags = be32_to_cpup(p);
5684 
5685         /* Channel attributes */
5686         status = decode_chan_attrs(xdr, &res->fc_attrs);
5687         if (!status)
5688                 status = decode_chan_attrs(xdr, &res->bc_attrs);
5689         return status;
5690 }
5691 
5692 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5693 {
5694         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5695 }
5696 
5697 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5698 {
5699         return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5700 }
5701 
5702 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5703 {
5704         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5705 }
5706 #endif /* CONFIG_NFS_V4_1 */
5707 
5708 static int decode_sequence(struct xdr_stream *xdr,
5709                            struct nfs4_sequence_res *res,
5710                            struct rpc_rqst *rqstp)
5711 {
5712 #if defined(CONFIG_NFS_V4_1)
5713         struct nfs4_session *session;
5714         struct nfs4_sessionid id;
5715         u32 dummy;
5716         int status;
5717         __be32 *p;
5718 
5719         if (res->sr_slot == NULL)
5720                 return 0;
5721         if (!res->sr_slot->table->session)
5722                 return 0;
5723 
5724         status = decode_op_hdr(xdr, OP_SEQUENCE);
5725         if (!status)
5726                 status = decode_sessionid(xdr, &id);
5727         if (unlikely(status))
5728                 goto out_err;
5729 
5730         /*
5731          * If the server returns different values for sessionID, slotID or
5732          * sequence number, the server is looney tunes.
5733          */
5734         status = -EREMOTEIO;
5735         session = res->sr_slot->table->session;
5736 
5737         if (memcmp(id.data, session->sess_id.data,
5738                    NFS4_MAX_SESSIONID_LEN)) {
5739                 dprintk("%s Invalid session id\n", __func__);
5740                 goto out_err;
5741         }
5742 
5743         p = xdr_inline_decode(xdr, 20);
5744         if (unlikely(!p))
5745                 goto out_overflow;
5746 
5747         /* seqid */
5748         dummy = be32_to_cpup(p++);
5749         if (dummy != res->sr_slot->seq_nr) {
5750                 dprintk("%s Invalid sequence number\n", __func__);
5751                 goto out_err;
5752         }
5753         /* slot id */
5754         dummy = be32_to_cpup(p++);
5755         if (dummy != res->sr_slot->slot_nr) {
5756                 dprintk("%s Invalid slot id\n", __func__);
5757                 goto out_err;
5758         }
5759         /* highest slot id */
5760         res->sr_highest_slotid = be32_to_cpup(p++);
5761         /* target highest slot id */
5762         res->sr_target_highest_slotid = be32_to_cpup(p++);
5763         /* result flags */
5764         res->sr_status_flags = be32_to_cpup(p);
5765         status = 0;
5766 out_err:
5767         res->sr_status = status;
5768         return status;
5769 out_overflow:
5770         status = -EIO;
5771         goto out_err;
5772 #else  /* CONFIG_NFS_V4_1 */
5773         return 0;
5774 #endif /* CONFIG_NFS_V4_1 */
5775 }
5776 
5777 #if defined(CONFIG_NFS_V4_1)
5778 static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
5779 {
5780         stateid->type = NFS4_LAYOUT_STATEID_TYPE;
5781         return decode_stateid(xdr, stateid);
5782 }
5783 
5784 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5785                                 struct nfs4_getdeviceinfo_res *res)
5786 {
5787         struct pnfs_device *pdev = res->pdev;
5788         __be32 *p;
5789         uint32_t len, type;
5790         int status;
5791 
5792         status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5793         if (status) {
5794                 if (status == -ETOOSMALL) {
5795                         p = xdr_inline_decode(xdr, 4);
5796                         if (unlikely(!p))
5797                                 return -EIO;
5798                         pdev->mincount = be32_to_cpup(p);
5799                         dprintk("%s: Min count too small. mincnt = %u\n",
5800                                 __func__, pdev->mincount);
5801                 }
5802                 return status;
5803         }
5804 
5805         p = xdr_inline_decode(xdr, 8);
5806         if (unlikely(!p))
5807                 return -EIO;
5808         type = be32_to_cpup(p++);
5809         if (type != pdev->layout_type) {
5810                 dprintk("%s: layout mismatch req: %u pdev: %u\n",
5811                         __func__, pdev->layout_type, type);
5812                 return -EINVAL;
5813         }
5814         /*
5815          * Get the length of the opaque device_addr4. xdr_read_pages places
5816          * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
5817          * and places the remaining xdr data in xdr_buf->tail
5818          */
5819         pdev->mincount = be32_to_cpup(p);
5820         if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
5821                 return -EIO;
5822 
5823         /* Parse notification bitmap, verifying that it is zero. */
5824         p = xdr_inline_decode(xdr, 4);
5825         if (unlikely(!p))
5826                 return -EIO;
5827         len = be32_to_cpup(p);
5828         if (len) {
5829                 uint32_t i;
5830 
5831                 p = xdr_inline_decode(xdr, 4 * len);
5832                 if (unlikely(!p))
5833                         return -EIO;
5834 
5835                 res->notification = be32_to_cpup(p++);
5836                 for (i = 1; i < len; i++) {
5837                         if (be32_to_cpup(p++)) {
5838                                 dprintk("%s: unsupported notification\n",
5839                                         __func__);
5840                                 return -EIO;
5841                         }
5842                 }
5843         }
5844         return 0;
5845 }
5846 
5847 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
5848                             struct nfs4_layoutget_res *res)
5849 {
5850         __be32 *p;
5851         int status;
5852         u32 layout_count;
5853         u32 recvd;
5854 
5855         status = decode_op_hdr(xdr, OP_LAYOUTGET);
5856         if (status)
5857                 goto out;
5858         p = xdr_inline_decode(xdr, 4);
5859         if (unlikely(!p))
5860                 goto out_overflow;
5861         res->return_on_close = be32_to_cpup(p);
5862         decode_layout_stateid(xdr, &res->stateid);
5863         p = xdr_inline_decode(xdr, 4);
5864         if (unlikely(!p))
5865                 goto out_overflow;
5866         layout_count = be32_to_cpup(p);
5867         if (!layout_count) {
5868                 dprintk("%s: server responded with empty layout array\n",
5869                         __func__);
5870                 status = -EINVAL;
5871                 goto out;
5872         }
5873 
5874         p = xdr_inline_decode(xdr, 28);
5875         if (unlikely(!p))
5876                 goto out_overflow;
5877         p = xdr_decode_hyper(p, &res->range.offset);
5878         p = xdr_decode_hyper(p, &res->range.length);
5879         res->range.iomode = be32_to_cpup(p++);
5880         res->type = be32_to_cpup(p++);
5881         res->layoutp->len = be32_to_cpup(p);
5882 
5883         dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
5884                 __func__,
5885                 (unsigned long)res->range.offset,
5886                 (unsigned long)res->range.length,
5887                 res->range.iomode,
5888                 res->type,
5889                 res->layoutp->len);
5890 
5891         recvd = xdr_read_pages(xdr, res->layoutp->len);
5892         if (res->layoutp->len > recvd) {
5893                 dprintk("NFS: server cheating in layoutget reply: "
5894                                 "layout len %u &