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

Version: ~ [ linux-4.18 ] ~ [ linux-4.17.14 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.62 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.119 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.147 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.118 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.57 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~ [ linux-next-20180810 ] ~ [ linux-next-20180813 ] ~
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 "internal.h"
 58 #include "nfs4idmap.h"
 59 #include "nfs4session.h"
 60 #include "pnfs.h"
 61 #include "netns.h"
 62 
 63 #define NFSDBG_FACILITY         NFSDBG_XDR
 64 
 65 /* Mapping from NFS error code to "errno" error code. */
 66 #define errno_NFSERR_IO         EIO
 67 
 68 struct compound_hdr;
 69 static int nfs4_stat_to_errno(int);
 70 static void encode_layoutget(struct xdr_stream *xdr,
 71                              const struct nfs4_layoutget_args *args,
 72                              struct compound_hdr *hdr);
 73 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
 74                              struct nfs4_layoutget_res *res);
 75 
 76 /* NFSv4 COMPOUND tags are only wanted for debugging purposes */
 77 #ifdef DEBUG
 78 #define NFS4_MAXTAGLEN          20
 79 #else
 80 #define NFS4_MAXTAGLEN          0
 81 #endif
 82 
 83 /* lock,open owner id:
 84  * we currently use size 2 (u64) out of (NFS4_OPAQUE_LIMIT  >> 2)
 85  */
 86 #define open_owner_id_maxsz     (1 + 2 + 1 + 1 + 2)
 87 #define lock_owner_id_maxsz     (1 + 1 + 4)
 88 #define decode_lockowner_maxsz  (1 + XDR_QUADLEN(IDMAP_NAMESZ))
 89 #define compound_encode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 90 #define compound_decode_hdr_maxsz       (3 + (NFS4_MAXTAGLEN >> 2))
 91 #define op_encode_hdr_maxsz     (1)
 92 #define op_decode_hdr_maxsz     (2)
 93 #define encode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 94 #define decode_stateid_maxsz    (XDR_QUADLEN(NFS4_STATEID_SIZE))
 95 #define encode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 96 #define decode_verifier_maxsz   (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
 97 #define encode_putfh_maxsz      (op_encode_hdr_maxsz + 1 + \
 98                                 (NFS4_FHSIZE >> 2))
 99 #define decode_putfh_maxsz      (op_decode_hdr_maxsz)
100 #define encode_putrootfh_maxsz  (op_encode_hdr_maxsz)
101 #define decode_putrootfh_maxsz  (op_decode_hdr_maxsz)
102 #define encode_getfh_maxsz      (op_encode_hdr_maxsz)
103 #define decode_getfh_maxsz      (op_decode_hdr_maxsz + 1 + \
104                                 ((3+NFS4_FHSIZE) >> 2))
105 #define nfs4_fattr_bitmap_maxsz 4
106 #define encode_getattr_maxsz    (op_encode_hdr_maxsz + nfs4_fattr_bitmap_maxsz)
107 #define nfstime4_maxsz          (3)
108 #define nfs4_name_maxsz         (1 + ((3 + NFS4_MAXNAMLEN) >> 2))
109 #define nfs4_path_maxsz         (1 + ((3 + NFS4_MAXPATHLEN) >> 2))
110 #define nfs4_owner_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
111 #define nfs4_group_maxsz        (1 + XDR_QUADLEN(IDMAP_NAMESZ))
112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
113 /* PI(4 bytes) + LFS(4 bytes) + 1(for null terminator?) + MAXLABELLEN */
114 #define nfs4_label_maxsz        (4 + 4 + 1 + XDR_QUADLEN(NFS4_MAXLABELLEN))
115 #else
116 #define nfs4_label_maxsz        0
117 #endif
118 /* We support only one layout type per file system */
119 #define decode_mdsthreshold_maxsz (1 + 1 + nfs4_fattr_bitmap_maxsz + 1 + 8)
120 /* This is based on getfattr, which uses the most attributes: */
121 #define nfs4_fattr_value_maxsz  (1 + (1 + 2 + 2 + 4 + 2 + 1 + 1 + 2 + 2 + \
122                                 3*nfstime4_maxsz + \
123                                 nfs4_owner_maxsz + \
124                                 nfs4_group_maxsz + nfs4_label_maxsz + \
125                                  decode_mdsthreshold_maxsz))
126 #define nfs4_fattr_maxsz        (nfs4_fattr_bitmap_maxsz + \
127                                 nfs4_fattr_value_maxsz)
128 #define decode_getattr_maxsz    (op_decode_hdr_maxsz + nfs4_fattr_maxsz)
129 #define encode_attrs_maxsz      (nfs4_fattr_bitmap_maxsz + \
130                                  1 + 2 + 1 + \
131                                 nfs4_owner_maxsz + \
132                                 nfs4_group_maxsz + \
133                                 nfs4_label_maxsz + \
134                                 1 + nfstime4_maxsz + \
135                                 1 + nfstime4_maxsz)
136 #define encode_savefh_maxsz     (op_encode_hdr_maxsz)
137 #define decode_savefh_maxsz     (op_decode_hdr_maxsz)
138 #define encode_restorefh_maxsz  (op_encode_hdr_maxsz)
139 #define decode_restorefh_maxsz  (op_decode_hdr_maxsz)
140 #define encode_fsinfo_maxsz     (encode_getattr_maxsz)
141 /* The 5 accounts for the PNFS attributes, and assumes that at most three
142  * layout types will be returned.
143  */
144 #define decode_fsinfo_maxsz     (op_decode_hdr_maxsz + \
145                                  nfs4_fattr_bitmap_maxsz + 4 + 8 + 5)
146 #define encode_renew_maxsz      (op_encode_hdr_maxsz + 3)
147 #define decode_renew_maxsz      (op_decode_hdr_maxsz)
148 #define encode_setclientid_maxsz \
149                                 (op_encode_hdr_maxsz + \
150                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
151                                 /* client name */ \
152                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
153                                 1 /* sc_prog */ + \
154                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
155                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
156                                 1) /* sc_cb_ident */
157 #define decode_setclientid_maxsz \
158                                 (op_decode_hdr_maxsz + \
159                                 2 /* clientid */ + \
160                                 XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
161                                 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
162                                 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
163 #define encode_setclientid_confirm_maxsz \
164                                 (op_encode_hdr_maxsz + \
165                                 3 + (NFS4_VERIFIER_SIZE >> 2))
166 #define decode_setclientid_confirm_maxsz \
167                                 (op_decode_hdr_maxsz)
168 #define encode_lookup_maxsz     (op_encode_hdr_maxsz + nfs4_name_maxsz)
169 #define decode_lookup_maxsz     (op_decode_hdr_maxsz)
170 #define encode_lookupp_maxsz    (op_encode_hdr_maxsz)
171 #define decode_lookupp_maxsz    (op_decode_hdr_maxsz)
172 #define encode_share_access_maxsz \
173                                 (2)
174 #define encode_createmode_maxsz (1 + encode_attrs_maxsz + encode_verifier_maxsz)
175 #define encode_opentype_maxsz   (1 + encode_createmode_maxsz)
176 #define encode_claim_null_maxsz (1 + nfs4_name_maxsz)
177 #define encode_open_maxsz       (op_encode_hdr_maxsz + \
178                                 2 + encode_share_access_maxsz + 2 + \
179                                 open_owner_id_maxsz + \
180                                 encode_opentype_maxsz + \
181                                 encode_claim_null_maxsz)
182 #define decode_space_limit_maxsz        (3)
183 #define decode_ace_maxsz        (3 + nfs4_owner_maxsz)
184 #define decode_delegation_maxsz (1 + decode_stateid_maxsz + 1 + \
185                                 decode_space_limit_maxsz + \
186                                 decode_ace_maxsz)
187 #define decode_change_info_maxsz        (5)
188 #define decode_open_maxsz       (op_decode_hdr_maxsz + \
189                                 decode_stateid_maxsz + \
190                                 decode_change_info_maxsz + 1 + \
191                                 nfs4_fattr_bitmap_maxsz + \
192                                 decode_delegation_maxsz)
193 #define encode_open_confirm_maxsz \
194                                 (op_encode_hdr_maxsz + \
195                                  encode_stateid_maxsz + 1)
196 #define decode_open_confirm_maxsz \
197                                 (op_decode_hdr_maxsz + \
198                                  decode_stateid_maxsz)
199 #define encode_open_downgrade_maxsz \
200                                 (op_encode_hdr_maxsz + \
201                                  encode_stateid_maxsz + 1 + \
202                                  encode_share_access_maxsz)
203 #define decode_open_downgrade_maxsz \
204                                 (op_decode_hdr_maxsz + \
205                                  decode_stateid_maxsz)
206 #define encode_close_maxsz      (op_encode_hdr_maxsz + \
207                                  1 + encode_stateid_maxsz)
208 #define decode_close_maxsz      (op_decode_hdr_maxsz + \
209                                  decode_stateid_maxsz)
210 #define encode_setattr_maxsz    (op_encode_hdr_maxsz + \
211                                  encode_stateid_maxsz + \
212                                  encode_attrs_maxsz)
213 #define decode_setattr_maxsz    (op_decode_hdr_maxsz + \
214                                  nfs4_fattr_bitmap_maxsz)
215 #define encode_read_maxsz       (op_encode_hdr_maxsz + \
216                                  encode_stateid_maxsz + 3)
217 #define decode_read_maxsz       (op_decode_hdr_maxsz + 2)
218 #define encode_readdir_maxsz    (op_encode_hdr_maxsz + \
219                                  2 + encode_verifier_maxsz + 5 + \
220                                 nfs4_label_maxsz)
221 #define decode_readdir_maxsz    (op_decode_hdr_maxsz + \
222                                  decode_verifier_maxsz)
223 #define encode_readlink_maxsz   (op_encode_hdr_maxsz)
224 #define decode_readlink_maxsz   (op_decode_hdr_maxsz + 1)
225 #define encode_write_maxsz      (op_encode_hdr_maxsz + \
226                                  encode_stateid_maxsz + 4)
227 #define decode_write_maxsz      (op_decode_hdr_maxsz + \
228                                  2 + decode_verifier_maxsz)
229 #define encode_commit_maxsz     (op_encode_hdr_maxsz + 3)
230 #define decode_commit_maxsz     (op_decode_hdr_maxsz + \
231                                  decode_verifier_maxsz)
232 #define encode_remove_maxsz     (op_encode_hdr_maxsz + \
233                                 nfs4_name_maxsz)
234 #define decode_remove_maxsz     (op_decode_hdr_maxsz + \
235                                  decode_change_info_maxsz)
236 #define encode_rename_maxsz     (op_encode_hdr_maxsz + \
237                                 2 * nfs4_name_maxsz)
238 #define decode_rename_maxsz     (op_decode_hdr_maxsz + \
239                                  decode_change_info_maxsz + \
240                                  decode_change_info_maxsz)
241 #define encode_link_maxsz       (op_encode_hdr_maxsz + \
242                                 nfs4_name_maxsz)
243 #define decode_link_maxsz       (op_decode_hdr_maxsz + decode_change_info_maxsz)
244 #define encode_lockowner_maxsz  (7)
245 #define encode_lock_maxsz       (op_encode_hdr_maxsz + \
246                                  7 + \
247                                  1 + encode_stateid_maxsz + 1 + \
248                                  encode_lockowner_maxsz)
249 #define decode_lock_denied_maxsz \
250                                 (8 + decode_lockowner_maxsz)
251 #define decode_lock_maxsz       (op_decode_hdr_maxsz + \
252                                  decode_lock_denied_maxsz)
253 #define encode_lockt_maxsz      (op_encode_hdr_maxsz + 5 + \
254                                 encode_lockowner_maxsz)
255 #define decode_lockt_maxsz      (op_decode_hdr_maxsz + \
256                                  decode_lock_denied_maxsz)
257 #define encode_locku_maxsz      (op_encode_hdr_maxsz + 3 + \
258                                  encode_stateid_maxsz + \
259                                  4)
260 #define decode_locku_maxsz      (op_decode_hdr_maxsz + \
261                                  decode_stateid_maxsz)
262 #define encode_release_lockowner_maxsz \
263                                 (op_encode_hdr_maxsz + \
264                                  encode_lockowner_maxsz)
265 #define decode_release_lockowner_maxsz \
266                                 (op_decode_hdr_maxsz)
267 #define encode_access_maxsz     (op_encode_hdr_maxsz + 1)
268 #define decode_access_maxsz     (op_decode_hdr_maxsz + 2)
269 #define encode_symlink_maxsz    (op_encode_hdr_maxsz + \
270                                 1 + nfs4_name_maxsz + \
271                                 1 + \
272                                 nfs4_fattr_maxsz)
273 #define decode_symlink_maxsz    (op_decode_hdr_maxsz + 8)
274 #define encode_create_maxsz     (op_encode_hdr_maxsz + \
275                                 1 + 2 + nfs4_name_maxsz + \
276                                 encode_attrs_maxsz)
277 #define decode_create_maxsz     (op_decode_hdr_maxsz + \
278                                 decode_change_info_maxsz + \
279                                 nfs4_fattr_bitmap_maxsz)
280 #define encode_statfs_maxsz     (encode_getattr_maxsz)
281 #define decode_statfs_maxsz     (decode_getattr_maxsz)
282 #define encode_delegreturn_maxsz (op_encode_hdr_maxsz + 4)
283 #define decode_delegreturn_maxsz (op_decode_hdr_maxsz)
284 #define encode_getacl_maxsz     (encode_getattr_maxsz)
285 #define decode_getacl_maxsz     (op_decode_hdr_maxsz + \
286                                  nfs4_fattr_bitmap_maxsz + 1)
287 #define encode_setacl_maxsz     (op_encode_hdr_maxsz + \
288                                  encode_stateid_maxsz + 3)
289 #define decode_setacl_maxsz     (decode_setattr_maxsz)
290 #define encode_fs_locations_maxsz \
291                                 (encode_getattr_maxsz)
292 #define decode_fs_locations_maxsz \
293                                 (0)
294 #define encode_secinfo_maxsz    (op_encode_hdr_maxsz + nfs4_name_maxsz)
295 #define decode_secinfo_maxsz    (op_decode_hdr_maxsz + 1 + ((NFS_MAX_SECFLAVORS * (16 + GSS_OID_MAX_LEN)) / 4))
296 
297 #if defined(CONFIG_NFS_V4_1)
298 #define NFS4_MAX_MACHINE_NAME_LEN (64)
299 #define IMPL_NAME_LIMIT (sizeof(utsname()->sysname) + sizeof(utsname()->release) + \
300                          sizeof(utsname()->version) + sizeof(utsname()->machine) + 8)
301 
302 #define encode_exchange_id_maxsz (op_encode_hdr_maxsz + \
303                                 encode_verifier_maxsz + \
304                                 1 /* co_ownerid.len */ + \
305                                 /* eia_clientowner */ \
306                                 1 + XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
307                                 1 /* flags */ + \
308                                 1 /* spa_how */ + \
309                                 /* max is SP4_MACH_CRED (for now) */ + \
310                                 1 + NFS4_OP_MAP_NUM_WORDS + \
311                                 1 + NFS4_OP_MAP_NUM_WORDS + \
312                                 1 /* implementation id array of size 1 */ + \
313                                 1 /* nii_domain */ + \
314                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
315                                 1 /* nii_name */ + \
316                                 XDR_QUADLEN(IMPL_NAME_LIMIT) + \
317                                 3 /* nii_date */)
318 #define decode_exchange_id_maxsz (op_decode_hdr_maxsz + \
319                                 2 /* eir_clientid */ + \
320                                 1 /* eir_sequenceid */ + \
321                                 1 /* eir_flags */ + \
322                                 1 /* spr_how */ + \
323                                   /* max is SP4_MACH_CRED (for now) */ + \
324                                 1 + NFS4_OP_MAP_NUM_WORDS + \
325                                 1 + NFS4_OP_MAP_NUM_WORDS + \
326                                 2 /* eir_server_owner.so_minor_id */ + \
327                                 /* eir_server_owner.so_major_id<> */ \
328                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
329                                 /* eir_server_scope<> */ \
330                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 + \
331                                 1 /* eir_server_impl_id array length */ + \
332                                 1 /* nii_domain */ + \
333                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
334                                 1 /* nii_name */ + \
335                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + \
336                                 3 /* nii_date */)
337 #define encode_channel_attrs_maxsz  (6 + 1 /* ca_rdma_ird.len (0) */)
338 #define decode_channel_attrs_maxsz  (6 + \
339                                      1 /* ca_rdma_ird.len */ + \
340                                      1 /* ca_rdma_ird */)
341 #define encode_create_session_maxsz  (op_encode_hdr_maxsz + \
342                                      2 /* csa_clientid */ + \
343                                      1 /* csa_sequence */ + \
344                                      1 /* csa_flags */ + \
345                                      encode_channel_attrs_maxsz + \
346                                      encode_channel_attrs_maxsz + \
347                                      1 /* csa_cb_program */ + \
348                                      1 /* csa_sec_parms.len (1) */ + \
349                                      1 /* cb_secflavor (AUTH_SYS) */ + \
350                                      1 /* stamp */ + \
351                                      1 /* machinename.len */ + \
352                                      XDR_QUADLEN(NFS4_MAX_MACHINE_NAME_LEN) + \
353                                      1 /* uid */ + \
354                                      1 /* gid */ + \
355                                      1 /* gids.len (0) */)
356 #define decode_create_session_maxsz  (op_decode_hdr_maxsz +     \
357                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
358                                      1 /* csr_sequence */ + \
359                                      1 /* csr_flags */ + \
360                                      decode_channel_attrs_maxsz + \
361                                      decode_channel_attrs_maxsz)
362 #define encode_bind_conn_to_session_maxsz  (op_encode_hdr_maxsz + \
363                                      /* bctsa_sessid */ \
364                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
365                                      1 /* bctsa_dir */ + \
366                                      1 /* bctsa_use_conn_in_rdma_mode */)
367 #define decode_bind_conn_to_session_maxsz  (op_decode_hdr_maxsz +       \
368                                      /* bctsr_sessid */ \
369                                      XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
370                                      1 /* bctsr_dir */ + \
371                                      1 /* bctsr_use_conn_in_rdma_mode */)
372 #define encode_destroy_session_maxsz    (op_encode_hdr_maxsz + 4)
373 #define decode_destroy_session_maxsz    (op_decode_hdr_maxsz)
374 #define encode_destroy_clientid_maxsz   (op_encode_hdr_maxsz + 2)
375 #define decode_destroy_clientid_maxsz   (op_decode_hdr_maxsz)
376 #define encode_sequence_maxsz   (op_encode_hdr_maxsz + \
377                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 4)
378 #define decode_sequence_maxsz   (op_decode_hdr_maxsz + \
379                                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5)
380 #define encode_reclaim_complete_maxsz   (op_encode_hdr_maxsz + 4)
381 #define decode_reclaim_complete_maxsz   (op_decode_hdr_maxsz + 4)
382 #define encode_getdeviceinfo_maxsz (op_encode_hdr_maxsz + \
383                                 XDR_QUADLEN(NFS4_DEVICEID4_SIZE) + \
384                                 1 /* layout type */ + \
385                                 1 /* maxcount */ + \
386                                 1 /* bitmap size */ + \
387                                 1 /* notification bitmap length */ + \
388                                 1 /* notification bitmap, word 0 */)
389 #define decode_getdeviceinfo_maxsz (op_decode_hdr_maxsz + \
390                                 1 /* layout type */ + \
391                                 1 /* opaque devaddr4 length */ + \
392                                   /* devaddr4 payload is read into page */ \
393                                 1 /* notification bitmap length */ + \
394                                 1 /* notification bitmap, word 0 */)
395 #define encode_layoutget_maxsz  (op_encode_hdr_maxsz + 10 + \
396                                 encode_stateid_maxsz)
397 #define decode_layoutget_maxsz  (op_decode_hdr_maxsz + 8 + \
398                                 decode_stateid_maxsz + \
399                                 XDR_QUADLEN(PNFS_LAYOUT_MAXSIZE))
400 #define encode_layoutcommit_maxsz (op_encode_hdr_maxsz +          \
401                                 2 /* offset */ + \
402                                 2 /* length */ + \
403                                 1 /* reclaim */ + \
404                                 encode_stateid_maxsz + \
405                                 1 /* new offset (true) */ + \
406                                 2 /* last byte written */ + \
407                                 1 /* nt_timechanged (false) */ + \
408                                 1 /* layoutupdate4 layout type */ + \
409                                 1 /* layoutupdate4 opaqueue len */)
410                                   /* the actual content of layoutupdate4 should
411                                      be allocated by drivers and spliced in
412                                      using xdr_write_pages */
413 #define decode_layoutcommit_maxsz (op_decode_hdr_maxsz + 3)
414 #define encode_layoutreturn_maxsz (8 + op_encode_hdr_maxsz + \
415                                 encode_stateid_maxsz + \
416                                 1 + \
417                                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT))
418 #define decode_layoutreturn_maxsz (op_decode_hdr_maxsz + \
419                                 1 + decode_stateid_maxsz)
420 #define encode_secinfo_no_name_maxsz (op_encode_hdr_maxsz + 1)
421 #define decode_secinfo_no_name_maxsz decode_secinfo_maxsz
422 #define encode_test_stateid_maxsz       (op_encode_hdr_maxsz + 2 + \
423                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
424 #define decode_test_stateid_maxsz       (op_decode_hdr_maxsz + 2 + 1)
425 #define encode_free_stateid_maxsz       (op_encode_hdr_maxsz + 1 + \
426                                          XDR_QUADLEN(NFS4_STATEID_SIZE))
427 #define decode_free_stateid_maxsz       (op_decode_hdr_maxsz)
428 #else /* CONFIG_NFS_V4_1 */
429 #define encode_sequence_maxsz   0
430 #define decode_sequence_maxsz   0
431 #define encode_layoutreturn_maxsz 0
432 #define decode_layoutreturn_maxsz 0
433 #define encode_layoutget_maxsz  0
434 #define decode_layoutget_maxsz  0
435 #endif /* CONFIG_NFS_V4_1 */
436 
437 #define NFS4_enc_compound_sz    (1024)  /* XXX: large enough? */
438 #define NFS4_dec_compound_sz    (1024)  /* XXX: large enough? */
439 #define NFS4_enc_read_sz        (compound_encode_hdr_maxsz + \
440                                 encode_sequence_maxsz + \
441                                 encode_putfh_maxsz + \
442                                 encode_read_maxsz)
443 #define NFS4_dec_read_sz        (compound_decode_hdr_maxsz + \
444                                 decode_sequence_maxsz + \
445                                 decode_putfh_maxsz + \
446                                 decode_read_maxsz)
447 #define NFS4_enc_readlink_sz    (compound_encode_hdr_maxsz + \
448                                 encode_sequence_maxsz + \
449                                 encode_putfh_maxsz + \
450                                 encode_readlink_maxsz)
451 #define NFS4_dec_readlink_sz    (compound_decode_hdr_maxsz + \
452                                 decode_sequence_maxsz + \
453                                 decode_putfh_maxsz + \
454                                 decode_readlink_maxsz)
455 #define NFS4_enc_readdir_sz     (compound_encode_hdr_maxsz + \
456                                 encode_sequence_maxsz + \
457                                 encode_putfh_maxsz + \
458                                 encode_readdir_maxsz)
459 #define NFS4_dec_readdir_sz     (compound_decode_hdr_maxsz + \
460                                 decode_sequence_maxsz + \
461                                 decode_putfh_maxsz + \
462                                 decode_readdir_maxsz)
463 #define NFS4_enc_write_sz       (compound_encode_hdr_maxsz + \
464                                 encode_sequence_maxsz + \
465                                 encode_putfh_maxsz + \
466                                 encode_write_maxsz + \
467                                 encode_getattr_maxsz)
468 #define NFS4_dec_write_sz       (compound_decode_hdr_maxsz + \
469                                 decode_sequence_maxsz + \
470                                 decode_putfh_maxsz + \
471                                 decode_write_maxsz + \
472                                 decode_getattr_maxsz)
473 #define NFS4_enc_commit_sz      (compound_encode_hdr_maxsz + \
474                                 encode_sequence_maxsz + \
475                                 encode_putfh_maxsz + \
476                                 encode_commit_maxsz)
477 #define NFS4_dec_commit_sz      (compound_decode_hdr_maxsz + \
478                                 decode_sequence_maxsz + \
479                                 decode_putfh_maxsz + \
480                                 decode_commit_maxsz)
481 #define NFS4_enc_open_sz        (compound_encode_hdr_maxsz + \
482                                 encode_sequence_maxsz + \
483                                 encode_putfh_maxsz + \
484                                 encode_open_maxsz + \
485                                 encode_access_maxsz + \
486                                 encode_getfh_maxsz + \
487                                 encode_getattr_maxsz + \
488                                 encode_layoutget_maxsz)
489 #define NFS4_dec_open_sz        (compound_decode_hdr_maxsz + \
490                                 decode_sequence_maxsz + \
491                                 decode_putfh_maxsz + \
492                                 decode_open_maxsz + \
493                                 decode_access_maxsz + \
494                                 decode_getfh_maxsz + \
495                                 decode_getattr_maxsz + \
496                                 decode_layoutget_maxsz)
497 #define NFS4_enc_open_confirm_sz \
498                                 (compound_encode_hdr_maxsz + \
499                                  encode_putfh_maxsz + \
500                                  encode_open_confirm_maxsz)
501 #define NFS4_dec_open_confirm_sz \
502                                 (compound_decode_hdr_maxsz + \
503                                  decode_putfh_maxsz + \
504                                  decode_open_confirm_maxsz)
505 #define NFS4_enc_open_noattr_sz (compound_encode_hdr_maxsz + \
506                                         encode_sequence_maxsz + \
507                                         encode_putfh_maxsz + \
508                                         encode_open_maxsz + \
509                                         encode_access_maxsz + \
510                                         encode_getattr_maxsz + \
511                                         encode_layoutget_maxsz)
512 #define NFS4_dec_open_noattr_sz (compound_decode_hdr_maxsz + \
513                                         decode_sequence_maxsz + \
514                                         decode_putfh_maxsz + \
515                                         decode_open_maxsz + \
516                                         decode_access_maxsz + \
517                                         decode_getattr_maxsz + \
518                                         decode_layoutget_maxsz)
519 #define NFS4_enc_open_downgrade_sz \
520                                 (compound_encode_hdr_maxsz + \
521                                  encode_sequence_maxsz + \
522                                  encode_putfh_maxsz + \
523                                  encode_layoutreturn_maxsz + \
524                                  encode_open_downgrade_maxsz)
525 #define NFS4_dec_open_downgrade_sz \
526                                 (compound_decode_hdr_maxsz + \
527                                  decode_sequence_maxsz + \
528                                  decode_putfh_maxsz + \
529                                  decode_layoutreturn_maxsz + \
530                                  decode_open_downgrade_maxsz)
531 #define NFS4_enc_close_sz       (compound_encode_hdr_maxsz + \
532                                  encode_sequence_maxsz + \
533                                  encode_putfh_maxsz + \
534                                  encode_layoutreturn_maxsz + \
535                                  encode_close_maxsz + \
536                                  encode_getattr_maxsz)
537 #define NFS4_dec_close_sz       (compound_decode_hdr_maxsz + \
538                                  decode_sequence_maxsz + \
539                                  decode_putfh_maxsz + \
540                                  decode_layoutreturn_maxsz + \
541                                  decode_close_maxsz + \
542                                  decode_getattr_maxsz)
543 #define NFS4_enc_setattr_sz     (compound_encode_hdr_maxsz + \
544                                  encode_sequence_maxsz + \
545                                  encode_putfh_maxsz + \
546                                  encode_setattr_maxsz + \
547                                  encode_getattr_maxsz)
548 #define NFS4_dec_setattr_sz     (compound_decode_hdr_maxsz + \
549                                  decode_sequence_maxsz + \
550                                  decode_putfh_maxsz + \
551                                  decode_setattr_maxsz + \
552                                  decode_getattr_maxsz)
553 #define NFS4_enc_fsinfo_sz      (compound_encode_hdr_maxsz + \
554                                 encode_sequence_maxsz + \
555                                 encode_putfh_maxsz + \
556                                 encode_fsinfo_maxsz)
557 #define NFS4_dec_fsinfo_sz      (compound_decode_hdr_maxsz + \
558                                 decode_sequence_maxsz + \
559                                 decode_putfh_maxsz + \
560                                 decode_fsinfo_maxsz)
561 #define NFS4_enc_renew_sz       (compound_encode_hdr_maxsz + \
562                                 encode_renew_maxsz)
563 #define NFS4_dec_renew_sz       (compound_decode_hdr_maxsz + \
564                                 decode_renew_maxsz)
565 #define NFS4_enc_setclientid_sz (compound_encode_hdr_maxsz + \
566                                 encode_setclientid_maxsz)
567 #define NFS4_dec_setclientid_sz (compound_decode_hdr_maxsz + \
568                                 decode_setclientid_maxsz)
569 #define NFS4_enc_setclientid_confirm_sz \
570                                 (compound_encode_hdr_maxsz + \
571                                 encode_setclientid_confirm_maxsz)
572 #define NFS4_dec_setclientid_confirm_sz \
573                                 (compound_decode_hdr_maxsz + \
574                                 decode_setclientid_confirm_maxsz)
575 #define NFS4_enc_lock_sz        (compound_encode_hdr_maxsz + \
576                                 encode_sequence_maxsz + \
577                                 encode_putfh_maxsz + \
578                                 encode_lock_maxsz)
579 #define NFS4_dec_lock_sz        (compound_decode_hdr_maxsz + \
580                                 decode_sequence_maxsz + \
581                                 decode_putfh_maxsz + \
582                                 decode_lock_maxsz)
583 #define NFS4_enc_lockt_sz       (compound_encode_hdr_maxsz + \
584                                 encode_sequence_maxsz + \
585                                 encode_putfh_maxsz + \
586                                 encode_lockt_maxsz)
587 #define NFS4_dec_lockt_sz       (compound_decode_hdr_maxsz + \
588                                  decode_sequence_maxsz + \
589                                  decode_putfh_maxsz + \
590                                  decode_lockt_maxsz)
591 #define NFS4_enc_locku_sz       (compound_encode_hdr_maxsz + \
592                                 encode_sequence_maxsz + \
593                                 encode_putfh_maxsz + \
594                                 encode_locku_maxsz)
595 #define NFS4_dec_locku_sz       (compound_decode_hdr_maxsz + \
596                                 decode_sequence_maxsz + \
597                                 decode_putfh_maxsz + \
598                                 decode_locku_maxsz)
599 #define NFS4_enc_release_lockowner_sz \
600                                 (compound_encode_hdr_maxsz + \
601                                  encode_lockowner_maxsz)
602 #define NFS4_dec_release_lockowner_sz \
603                                 (compound_decode_hdr_maxsz + \
604                                  decode_lockowner_maxsz)
605 #define NFS4_enc_access_sz      (compound_encode_hdr_maxsz + \
606                                 encode_sequence_maxsz + \
607                                 encode_putfh_maxsz + \
608                                 encode_access_maxsz + \
609                                 encode_getattr_maxsz)
610 #define NFS4_dec_access_sz      (compound_decode_hdr_maxsz + \
611                                 decode_sequence_maxsz + \
612                                 decode_putfh_maxsz + \
613                                 decode_access_maxsz + \
614                                 decode_getattr_maxsz)
615 #define NFS4_enc_getattr_sz     (compound_encode_hdr_maxsz + \
616                                 encode_sequence_maxsz + \
617                                 encode_putfh_maxsz + \
618                                 encode_getattr_maxsz + \
619                                 encode_renew_maxsz)
620 #define NFS4_dec_getattr_sz     (compound_decode_hdr_maxsz + \
621                                 decode_sequence_maxsz + \
622                                 decode_putfh_maxsz + \
623                                 decode_getattr_maxsz + \
624                                 decode_renew_maxsz)
625 #define NFS4_enc_lookup_sz      (compound_encode_hdr_maxsz + \
626                                 encode_sequence_maxsz + \
627                                 encode_putfh_maxsz + \
628                                 encode_lookup_maxsz + \
629                                 encode_getattr_maxsz + \
630                                 encode_getfh_maxsz)
631 #define NFS4_dec_lookup_sz      (compound_decode_hdr_maxsz + \
632                                 decode_sequence_maxsz + \
633                                 decode_putfh_maxsz + \
634                                 decode_lookup_maxsz + \
635                                 decode_getattr_maxsz + \
636                                 decode_getfh_maxsz)
637 #define NFS4_enc_lookupp_sz     (compound_encode_hdr_maxsz + \
638                                 encode_sequence_maxsz + \
639                                 encode_putfh_maxsz + \
640                                 encode_lookupp_maxsz + \
641                                 encode_getattr_maxsz + \
642                                 encode_getfh_maxsz)
643 #define NFS4_dec_lookupp_sz     (compound_decode_hdr_maxsz + \
644                                 decode_sequence_maxsz + \
645                                 decode_putfh_maxsz + \
646                                 decode_lookupp_maxsz + \
647                                 decode_getattr_maxsz + \
648                                 decode_getfh_maxsz)
649 #define NFS4_enc_lookup_root_sz (compound_encode_hdr_maxsz + \
650                                 encode_sequence_maxsz + \
651                                 encode_putrootfh_maxsz + \
652                                 encode_getattr_maxsz + \
653                                 encode_getfh_maxsz)
654 #define NFS4_dec_lookup_root_sz (compound_decode_hdr_maxsz + \
655                                 decode_sequence_maxsz + \
656                                 decode_putrootfh_maxsz + \
657                                 decode_getattr_maxsz + \
658                                 decode_getfh_maxsz)
659 #define NFS4_enc_remove_sz      (compound_encode_hdr_maxsz + \
660                                 encode_sequence_maxsz + \
661                                 encode_putfh_maxsz + \
662                                 encode_remove_maxsz)
663 #define NFS4_dec_remove_sz      (compound_decode_hdr_maxsz + \
664                                 decode_sequence_maxsz + \
665                                 decode_putfh_maxsz + \
666                                 decode_remove_maxsz)
667 #define NFS4_enc_rename_sz      (compound_encode_hdr_maxsz + \
668                                 encode_sequence_maxsz + \
669                                 encode_putfh_maxsz + \
670                                 encode_savefh_maxsz + \
671                                 encode_putfh_maxsz + \
672                                 encode_rename_maxsz)
673 #define NFS4_dec_rename_sz      (compound_decode_hdr_maxsz + \
674                                 decode_sequence_maxsz + \
675                                 decode_putfh_maxsz + \
676                                 decode_savefh_maxsz + \
677                                 decode_putfh_maxsz + \
678                                 decode_rename_maxsz)
679 #define NFS4_enc_link_sz        (compound_encode_hdr_maxsz + \
680                                 encode_sequence_maxsz + \
681                                 encode_putfh_maxsz + \
682                                 encode_savefh_maxsz + \
683                                 encode_putfh_maxsz + \
684                                 encode_link_maxsz + \
685                                 encode_restorefh_maxsz + \
686                                 encode_getattr_maxsz)
687 #define NFS4_dec_link_sz        (compound_decode_hdr_maxsz + \
688                                 decode_sequence_maxsz + \
689                                 decode_putfh_maxsz + \
690                                 decode_savefh_maxsz + \
691                                 decode_putfh_maxsz + \
692                                 decode_link_maxsz + \
693                                 decode_restorefh_maxsz + \
694                                 decode_getattr_maxsz)
695 #define NFS4_enc_symlink_sz     (compound_encode_hdr_maxsz + \
696                                 encode_sequence_maxsz + \
697                                 encode_putfh_maxsz + \
698                                 encode_symlink_maxsz + \
699                                 encode_getattr_maxsz + \
700                                 encode_getfh_maxsz)
701 #define NFS4_dec_symlink_sz     (compound_decode_hdr_maxsz + \
702                                 decode_sequence_maxsz + \
703                                 decode_putfh_maxsz + \
704                                 decode_symlink_maxsz + \
705                                 decode_getattr_maxsz + \
706                                 decode_getfh_maxsz)
707 #define NFS4_enc_create_sz      (compound_encode_hdr_maxsz + \
708                                 encode_sequence_maxsz + \
709                                 encode_putfh_maxsz + \
710                                 encode_create_maxsz + \
711                                 encode_getfh_maxsz + \
712                                 encode_getattr_maxsz)
713 #define NFS4_dec_create_sz      (compound_decode_hdr_maxsz + \
714                                 decode_sequence_maxsz + \
715                                 decode_putfh_maxsz + \
716                                 decode_create_maxsz + \
717                                 decode_getfh_maxsz + \
718                                 decode_getattr_maxsz)
719 #define NFS4_enc_pathconf_sz    (compound_encode_hdr_maxsz + \
720                                 encode_sequence_maxsz + \
721                                 encode_putfh_maxsz + \
722                                 encode_getattr_maxsz)
723 #define NFS4_dec_pathconf_sz    (compound_decode_hdr_maxsz + \
724                                 decode_sequence_maxsz + \
725                                 decode_putfh_maxsz + \
726                                 decode_getattr_maxsz)
727 #define NFS4_enc_statfs_sz      (compound_encode_hdr_maxsz + \
728                                 encode_sequence_maxsz + \
729                                 encode_putfh_maxsz + \
730                                 encode_statfs_maxsz)
731 #define NFS4_dec_statfs_sz      (compound_decode_hdr_maxsz + \
732                                 decode_sequence_maxsz + \
733                                 decode_putfh_maxsz + \
734                                 decode_statfs_maxsz)
735 #define NFS4_enc_server_caps_sz (compound_encode_hdr_maxsz + \
736                                 encode_sequence_maxsz + \
737                                 encode_putfh_maxsz + \
738                                 encode_getattr_maxsz)
739 #define NFS4_dec_server_caps_sz (compound_decode_hdr_maxsz + \
740                                 decode_sequence_maxsz + \
741                                 decode_putfh_maxsz + \
742                                 decode_getattr_maxsz)
743 #define NFS4_enc_delegreturn_sz (compound_encode_hdr_maxsz + \
744                                 encode_sequence_maxsz + \
745                                 encode_putfh_maxsz + \
746                                 encode_layoutreturn_maxsz + \
747                                 encode_delegreturn_maxsz + \
748                                 encode_getattr_maxsz)
749 #define NFS4_dec_delegreturn_sz (compound_decode_hdr_maxsz + \
750                                 decode_sequence_maxsz + \
751                                 decode_putfh_maxsz + \
752                                 decode_layoutreturn_maxsz + \
753                                 decode_delegreturn_maxsz + \
754                                 decode_getattr_maxsz)
755 #define NFS4_enc_getacl_sz      (compound_encode_hdr_maxsz + \
756                                 encode_sequence_maxsz + \
757                                 encode_putfh_maxsz + \
758                                 encode_getacl_maxsz)
759 #define NFS4_dec_getacl_sz      (compound_decode_hdr_maxsz + \
760                                 decode_sequence_maxsz + \
761                                 decode_putfh_maxsz + \
762                                 decode_getacl_maxsz)
763 #define NFS4_enc_setacl_sz      (compound_encode_hdr_maxsz + \
764                                 encode_sequence_maxsz + \
765                                 encode_putfh_maxsz + \
766                                 encode_setacl_maxsz)
767 #define NFS4_dec_setacl_sz      (compound_decode_hdr_maxsz + \
768                                 decode_sequence_maxsz + \
769                                 decode_putfh_maxsz + \
770                                 decode_setacl_maxsz)
771 #define NFS4_enc_fs_locations_sz \
772                                 (compound_encode_hdr_maxsz + \
773                                  encode_sequence_maxsz + \
774                                  encode_putfh_maxsz + \
775                                  encode_lookup_maxsz + \
776                                  encode_fs_locations_maxsz + \
777                                  encode_renew_maxsz)
778 #define NFS4_dec_fs_locations_sz \
779                                 (compound_decode_hdr_maxsz + \
780                                  decode_sequence_maxsz + \
781                                  decode_putfh_maxsz + \
782                                  decode_lookup_maxsz + \
783                                  decode_fs_locations_maxsz + \
784                                  decode_renew_maxsz)
785 #define NFS4_enc_secinfo_sz     (compound_encode_hdr_maxsz + \
786                                 encode_sequence_maxsz + \
787                                 encode_putfh_maxsz + \
788                                 encode_secinfo_maxsz)
789 #define NFS4_dec_secinfo_sz     (compound_decode_hdr_maxsz + \
790                                 decode_sequence_maxsz + \
791                                 decode_putfh_maxsz + \
792                                 decode_secinfo_maxsz)
793 #define NFS4_enc_fsid_present_sz \
794                                 (compound_encode_hdr_maxsz + \
795                                  encode_sequence_maxsz + \
796                                  encode_putfh_maxsz + \
797                                  encode_getfh_maxsz + \
798                                  encode_renew_maxsz)
799 #define NFS4_dec_fsid_present_sz \
800                                 (compound_decode_hdr_maxsz + \
801                                  decode_sequence_maxsz + \
802                                  decode_putfh_maxsz + \
803                                  decode_getfh_maxsz + \
804                                  decode_renew_maxsz)
805 #if defined(CONFIG_NFS_V4_1)
806 #define NFS4_enc_bind_conn_to_session_sz \
807                                 (compound_encode_hdr_maxsz + \
808                                  encode_bind_conn_to_session_maxsz)
809 #define NFS4_dec_bind_conn_to_session_sz \
810                                 (compound_decode_hdr_maxsz + \
811                                  decode_bind_conn_to_session_maxsz)
812 #define NFS4_enc_exchange_id_sz \
813                                 (compound_encode_hdr_maxsz + \
814                                  encode_exchange_id_maxsz)
815 #define NFS4_dec_exchange_id_sz \
816                                 (compound_decode_hdr_maxsz + \
817                                  decode_exchange_id_maxsz)
818 #define NFS4_enc_create_session_sz \
819                                 (compound_encode_hdr_maxsz + \
820                                  encode_create_session_maxsz)
821 #define NFS4_dec_create_session_sz \
822                                 (compound_decode_hdr_maxsz + \
823                                  decode_create_session_maxsz)
824 #define NFS4_enc_destroy_session_sz     (compound_encode_hdr_maxsz + \
825                                          encode_destroy_session_maxsz)
826 #define NFS4_dec_destroy_session_sz     (compound_decode_hdr_maxsz + \
827                                          decode_destroy_session_maxsz)
828 #define NFS4_enc_destroy_clientid_sz    (compound_encode_hdr_maxsz + \
829                                          encode_destroy_clientid_maxsz)
830 #define NFS4_dec_destroy_clientid_sz    (compound_decode_hdr_maxsz + \
831                                          decode_destroy_clientid_maxsz)
832 #define NFS4_enc_sequence_sz \
833                                 (compound_decode_hdr_maxsz + \
834                                  encode_sequence_maxsz)
835 #define NFS4_dec_sequence_sz \
836                                 (compound_decode_hdr_maxsz + \
837                                  decode_sequence_maxsz)
838 #define NFS4_enc_get_lease_time_sz      (compound_encode_hdr_maxsz + \
839                                          encode_sequence_maxsz + \
840                                          encode_putrootfh_maxsz + \
841                                          encode_fsinfo_maxsz)
842 #define NFS4_dec_get_lease_time_sz      (compound_decode_hdr_maxsz + \
843                                          decode_sequence_maxsz + \
844                                          decode_putrootfh_maxsz + \
845                                          decode_fsinfo_maxsz)
846 #define NFS4_enc_reclaim_complete_sz    (compound_encode_hdr_maxsz + \
847                                          encode_sequence_maxsz + \
848                                          encode_reclaim_complete_maxsz)
849 #define NFS4_dec_reclaim_complete_sz    (compound_decode_hdr_maxsz + \
850                                          decode_sequence_maxsz + \
851                                          decode_reclaim_complete_maxsz)
852 #define NFS4_enc_getdeviceinfo_sz (compound_encode_hdr_maxsz +    \
853                                 encode_sequence_maxsz +\
854                                 encode_getdeviceinfo_maxsz)
855 #define NFS4_dec_getdeviceinfo_sz (compound_decode_hdr_maxsz +    \
856                                 decode_sequence_maxsz + \
857                                 decode_getdeviceinfo_maxsz)
858 #define NFS4_enc_layoutget_sz   (compound_encode_hdr_maxsz + \
859                                 encode_sequence_maxsz + \
860                                 encode_putfh_maxsz +        \
861                                 encode_layoutget_maxsz)
862 #define NFS4_dec_layoutget_sz   (compound_decode_hdr_maxsz + \
863                                 decode_sequence_maxsz + \
864                                 decode_putfh_maxsz +        \
865                                 decode_layoutget_maxsz)
866 #define NFS4_enc_layoutcommit_sz (compound_encode_hdr_maxsz + \
867                                 encode_sequence_maxsz +\
868                                 encode_putfh_maxsz + \
869                                 encode_layoutcommit_maxsz + \
870                                 encode_getattr_maxsz)
871 #define NFS4_dec_layoutcommit_sz (compound_decode_hdr_maxsz + \
872                                 decode_sequence_maxsz + \
873                                 decode_putfh_maxsz + \
874                                 decode_layoutcommit_maxsz + \
875                                 decode_getattr_maxsz)
876 #define NFS4_enc_layoutreturn_sz (compound_encode_hdr_maxsz + \
877                                 encode_sequence_maxsz + \
878                                 encode_putfh_maxsz + \
879                                 encode_layoutreturn_maxsz)
880 #define NFS4_dec_layoutreturn_sz (compound_decode_hdr_maxsz + \
881                                 decode_sequence_maxsz + \
882                                 decode_putfh_maxsz + \
883                                 decode_layoutreturn_maxsz)
884 #define NFS4_enc_secinfo_no_name_sz     (compound_encode_hdr_maxsz + \
885                                         encode_sequence_maxsz + \
886                                         encode_putrootfh_maxsz +\
887                                         encode_secinfo_no_name_maxsz)
888 #define NFS4_dec_secinfo_no_name_sz     (compound_decode_hdr_maxsz + \
889                                         decode_sequence_maxsz + \
890                                         decode_putrootfh_maxsz + \
891                                         decode_secinfo_no_name_maxsz)
892 #define NFS4_enc_test_stateid_sz        (compound_encode_hdr_maxsz + \
893                                          encode_sequence_maxsz + \
894                                          encode_test_stateid_maxsz)
895 #define NFS4_dec_test_stateid_sz        (compound_decode_hdr_maxsz + \
896                                          decode_sequence_maxsz + \
897                                          decode_test_stateid_maxsz)
898 #define NFS4_enc_free_stateid_sz        (compound_encode_hdr_maxsz + \
899                                          encode_sequence_maxsz + \
900                                          encode_free_stateid_maxsz)
901 #define NFS4_dec_free_stateid_sz        (compound_decode_hdr_maxsz + \
902                                          decode_sequence_maxsz + \
903                                          decode_free_stateid_maxsz)
904 
905 const u32 nfs41_maxwrite_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
906                                       compound_encode_hdr_maxsz +
907                                       encode_sequence_maxsz +
908                                       encode_putfh_maxsz +
909                                       encode_getattr_maxsz) *
910                                      XDR_UNIT);
911 
912 const u32 nfs41_maxread_overhead = ((RPC_MAX_HEADER_WITH_AUTH +
913                                      compound_decode_hdr_maxsz +
914                                      decode_sequence_maxsz +
915                                      decode_putfh_maxsz) *
916                                     XDR_UNIT);
917 
918 const u32 nfs41_maxgetdevinfo_overhead = ((RPC_MAX_REPHEADER_WITH_AUTH +
919                                            compound_decode_hdr_maxsz +
920                                            decode_sequence_maxsz) *
921                                           XDR_UNIT);
922 EXPORT_SYMBOL_GPL(nfs41_maxgetdevinfo_overhead);
923 #endif /* CONFIG_NFS_V4_1 */
924 
925 static const umode_t nfs_type2fmt[] = {
926         [NF4BAD] = 0,
927         [NF4REG] = S_IFREG,
928         [NF4DIR] = S_IFDIR,
929         [NF4BLK] = S_IFBLK,
930         [NF4CHR] = S_IFCHR,
931         [NF4LNK] = S_IFLNK,
932         [NF4SOCK] = S_IFSOCK,
933         [NF4FIFO] = S_IFIFO,
934         [NF4ATTRDIR] = 0,
935         [NF4NAMEDATTR] = 0,
936 };
937 
938 struct compound_hdr {
939         int32_t         status;
940         uint32_t        nops;
941         __be32 *        nops_p;
942         uint32_t        taglen;
943         char *          tag;
944         uint32_t        replen;         /* expected reply words */
945         u32             minorversion;
946 };
947 
948 static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
949 {
950         __be32 *p = xdr_reserve_space(xdr, nbytes);
951         BUG_ON(!p);
952         return p;
953 }
954 
955 static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
956 {
957         WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
958 }
959 
960 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
961 {
962         WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
963 }
964 
965 static void encode_uint32(struct xdr_stream *xdr, u32 n)
966 {
967         WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0);
968 }
969 
970 static void encode_uint64(struct xdr_stream *xdr, u64 n)
971 {
972         WARN_ON_ONCE(xdr_stream_encode_u64(xdr, n) < 0);
973 }
974 
975 static ssize_t xdr_encode_bitmap4(struct xdr_stream *xdr,
976                 const __u32 *bitmap, size_t len)
977 {
978         ssize_t ret;
979 
980         /* Trim empty words */
981         while (len > 0 && bitmap[len-1] == 0)
982                 len--;
983         ret = xdr_stream_encode_uint32_array(xdr, bitmap, len);
984         if (WARN_ON_ONCE(ret < 0))
985                 return ret;
986         return len;
987 }
988 
989 static size_t mask_bitmap4(const __u32 *bitmap, const __u32 *mask,
990                 __u32 *res, size_t len)
991 {
992         size_t i;
993         __u32 tmp;
994 
995         while (len > 0 && (bitmap[len-1] == 0 || mask[len-1] == 0))
996                 len--;
997         for (i = len; i-- > 0;) {
998                 tmp = bitmap[i] & mask[i];
999                 res[i] = tmp;
1000         }
1001         return len;
1002 }
1003 
1004 static void encode_nfs4_seqid(struct xdr_stream *xdr,
1005                 const struct nfs_seqid *seqid)
1006 {
1007         if (seqid != NULL)
1008                 encode_uint32(xdr, seqid->sequence->counter);
1009         else
1010                 encode_uint32(xdr, 0);
1011 }
1012 
1013 static void encode_compound_hdr(struct xdr_stream *xdr,
1014                                 struct rpc_rqst *req,
1015                                 struct compound_hdr *hdr)
1016 {
1017         __be32 *p;
1018         struct rpc_auth *auth = req->rq_cred->cr_auth;
1019 
1020         /* initialize running count of expected bytes in reply.
1021          * NOTE: the replied tag SHOULD be the same is the one sent,
1022          * but this is not required as a MUST for the server to do so. */
1023         hdr->replen = RPC_REPHDRSIZE + auth->au_rslack + 3 + hdr->taglen;
1024 
1025         WARN_ON_ONCE(hdr->taglen > NFS4_MAXTAGLEN);
1026         encode_string(xdr, hdr->taglen, hdr->tag);
1027         p = reserve_space(xdr, 8);
1028         *p++ = cpu_to_be32(hdr->minorversion);
1029         hdr->nops_p = p;
1030         *p = cpu_to_be32(hdr->nops);
1031 }
1032 
1033 static void encode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 op,
1034                 uint32_t replen,
1035                 struct compound_hdr *hdr)
1036 {
1037         encode_uint32(xdr, op);
1038         hdr->nops++;
1039         hdr->replen += replen;
1040 }
1041 
1042 static void encode_nops(struct compound_hdr *hdr)
1043 {
1044         WARN_ON_ONCE(hdr->nops > NFS4_MAX_OPS);
1045         *hdr->nops_p = htonl(hdr->nops);
1046 }
1047 
1048 static void encode_nfs4_stateid(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1049 {
1050         encode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
1051 }
1052 
1053 static void encode_nfs4_verifier(struct xdr_stream *xdr, const nfs4_verifier *verf)
1054 {
1055         encode_opaque_fixed(xdr, verf->data, NFS4_VERIFIER_SIZE);
1056 }
1057 
1058 static __be32 *
1059 xdr_encode_nfstime4(__be32 *p, const struct timespec *t)
1060 {
1061         p = xdr_encode_hyper(p, (__s64)t->tv_sec);
1062         *p++ = cpu_to_be32(t->tv_nsec);
1063         return p;
1064 }
1065 
1066 static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
1067                                 const struct nfs4_label *label,
1068                                 const umode_t *umask,
1069                                 const struct nfs_server *server,
1070                                 const uint32_t attrmask[])
1071 {
1072         struct timespec ts;
1073         char owner_name[IDMAP_NAMESZ];
1074         char owner_group[IDMAP_NAMESZ];
1075         int owner_namelen = 0;
1076         int owner_grouplen = 0;
1077         __be32 *p;
1078         uint32_t len = 0;
1079         uint32_t bmval[3] = { 0 };
1080 
1081         /*
1082          * We reserve enough space to write the entire attribute buffer at once.
1083          */
1084         if ((iap->ia_valid & ATTR_SIZE) && (attrmask[0] & FATTR4_WORD0_SIZE)) {
1085                 bmval[0] |= FATTR4_WORD0_SIZE;
1086                 len += 8;
1087         }
1088         if (iap->ia_valid & ATTR_MODE) {
1089                 if (umask && (attrmask[2] & FATTR4_WORD2_MODE_UMASK)) {
1090                         bmval[2] |= FATTR4_WORD2_MODE_UMASK;
1091                         len += 8;
1092                 } else if (attrmask[1] & FATTR4_WORD1_MODE) {
1093                         bmval[1] |= FATTR4_WORD1_MODE;
1094                         len += 4;
1095                 }
1096         }
1097         if ((iap->ia_valid & ATTR_UID) && (attrmask[1] & FATTR4_WORD1_OWNER)) {
1098                 owner_namelen = nfs_map_uid_to_name(server, iap->ia_uid, owner_name, IDMAP_NAMESZ);
1099                 if (owner_namelen < 0) {
1100                         dprintk("nfs: couldn't resolve uid %d to string\n",
1101                                         from_kuid(&init_user_ns, iap->ia_uid));
1102                         /* XXX */
1103                         strcpy(owner_name, "nobody");
1104                         owner_namelen = sizeof("nobody") - 1;
1105                         /* goto out; */
1106                 }
1107                 bmval[1] |= FATTR4_WORD1_OWNER;
1108                 len += 4 + (XDR_QUADLEN(owner_namelen) << 2);
1109         }
1110         if ((iap->ia_valid & ATTR_GID) &&
1111            (attrmask[1] & FATTR4_WORD1_OWNER_GROUP)) {
1112                 owner_grouplen = nfs_map_gid_to_group(server, iap->ia_gid, owner_group, IDMAP_NAMESZ);
1113                 if (owner_grouplen < 0) {
1114                         dprintk("nfs: couldn't resolve gid %d to string\n",
1115                                         from_kgid(&init_user_ns, iap->ia_gid));
1116                         strcpy(owner_group, "nobody");
1117                         owner_grouplen = sizeof("nobody") - 1;
1118                         /* goto out; */
1119                 }
1120                 bmval[1] |= FATTR4_WORD1_OWNER_GROUP;
1121                 len += 4 + (XDR_QUADLEN(owner_grouplen) << 2);
1122         }
1123         if (attrmask[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1124                 if (iap->ia_valid & ATTR_ATIME_SET) {
1125                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1126                         len += 4 + (nfstime4_maxsz << 2);
1127                 } else if (iap->ia_valid & ATTR_ATIME) {
1128                         bmval[1] |= FATTR4_WORD1_TIME_ACCESS_SET;
1129                         len += 4;
1130                 }
1131         }
1132         if (attrmask[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1133                 if (iap->ia_valid & ATTR_MTIME_SET) {
1134                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1135                         len += 4 + (nfstime4_maxsz << 2);
1136                 } else if (iap->ia_valid & ATTR_MTIME) {
1137                         bmval[1] |= FATTR4_WORD1_TIME_MODIFY_SET;
1138                         len += 4;
1139                 }
1140         }
1141 
1142         if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL)) {
1143                 len += 4 + 4 + 4 + (XDR_QUADLEN(label->len) << 2);
1144                 bmval[2] |= FATTR4_WORD2_SECURITY_LABEL;
1145         }
1146 
1147         xdr_encode_bitmap4(xdr, bmval, ARRAY_SIZE(bmval));
1148         xdr_stream_encode_opaque_inline(xdr, (void **)&p, len);
1149 
1150         if (bmval[0] & FATTR4_WORD0_SIZE)
1151                 p = xdr_encode_hyper(p, iap->ia_size);
1152         if (bmval[1] & FATTR4_WORD1_MODE)
1153                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1154         if (bmval[1] & FATTR4_WORD1_OWNER)
1155                 p = xdr_encode_opaque(p, owner_name, owner_namelen);
1156         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP)
1157                 p = xdr_encode_opaque(p, owner_group, owner_grouplen);
1158         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
1159                 if (iap->ia_valid & ATTR_ATIME_SET) {
1160                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1161                         ts = timespec64_to_timespec(iap->ia_atime);
1162                         p = xdr_encode_nfstime4(p, &ts);
1163                 } else
1164                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1165         }
1166         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
1167                 if (iap->ia_valid & ATTR_MTIME_SET) {
1168                         *p++ = cpu_to_be32(NFS4_SET_TO_CLIENT_TIME);
1169                         ts = timespec64_to_timespec(iap->ia_mtime);
1170                         p = xdr_encode_nfstime4(p, &ts);
1171                 } else
1172                         *p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
1173         }
1174         if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
1175                 *p++ = cpu_to_be32(label->lfs);
1176                 *p++ = cpu_to_be32(label->pi);
1177                 *p++ = cpu_to_be32(label->len);
1178                 p = xdr_encode_opaque_fixed(p, label->label, label->len);
1179         }
1180         if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
1181                 *p++ = cpu_to_be32(iap->ia_mode & S_IALLUGO);
1182                 *p++ = cpu_to_be32(*umask);
1183         }
1184 
1185 /* out: */
1186 }
1187 
1188 static void encode_access(struct xdr_stream *xdr, u32 access, struct compound_hdr *hdr)
1189 {
1190         encode_op_hdr(xdr, OP_ACCESS, decode_access_maxsz, hdr);
1191         encode_uint32(xdr, access);
1192 }
1193 
1194 static void encode_close(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1195 {
1196         encode_op_hdr(xdr, OP_CLOSE, decode_close_maxsz, hdr);
1197         encode_nfs4_seqid(xdr, arg->seqid);
1198         encode_nfs4_stateid(xdr, &arg->stateid);
1199 }
1200 
1201 static void encode_commit(struct xdr_stream *xdr, const struct nfs_commitargs *args, struct compound_hdr *hdr)
1202 {
1203         __be32 *p;
1204 
1205         encode_op_hdr(xdr, OP_COMMIT, decode_commit_maxsz, hdr);
1206         p = reserve_space(xdr, 12);
1207         p = xdr_encode_hyper(p, args->offset);
1208         *p = cpu_to_be32(args->count);
1209 }
1210 
1211 static void encode_create(struct xdr_stream *xdr, const struct nfs4_create_arg *create, struct compound_hdr *hdr)
1212 {
1213         __be32 *p;
1214 
1215         encode_op_hdr(xdr, OP_CREATE, decode_create_maxsz, hdr);
1216         encode_uint32(xdr, create->ftype);
1217 
1218         switch (create->ftype) {
1219         case NF4LNK:
1220                 p = reserve_space(xdr, 4);
1221                 *p = cpu_to_be32(create->u.symlink.len);
1222                 xdr_write_pages(xdr, create->u.symlink.pages, 0,
1223                                 create->u.symlink.len);
1224                 xdr->buf->flags |= XDRBUF_WRITE;
1225                 break;
1226 
1227         case NF4BLK: case NF4CHR:
1228                 p = reserve_space(xdr, 8);
1229                 *p++ = cpu_to_be32(create->u.device.specdata1);
1230                 *p = cpu_to_be32(create->u.device.specdata2);
1231                 break;
1232 
1233         default:
1234                 break;
1235         }
1236 
1237         encode_string(xdr, create->name->len, create->name->name);
1238         encode_attrs(xdr, create->attrs, create->label, &create->umask,
1239                         create->server, create->server->attr_bitmask);
1240 }
1241 
1242 static void encode_getattr(struct xdr_stream *xdr,
1243                 const __u32 *bitmap, const __u32 *mask, size_t len,
1244                 struct compound_hdr *hdr)
1245 {
1246         __u32 masked_bitmap[nfs4_fattr_bitmap_maxsz];
1247 
1248         encode_op_hdr(xdr, OP_GETATTR, decode_getattr_maxsz, hdr);
1249         if (mask) {
1250                 if (WARN_ON_ONCE(len > ARRAY_SIZE(masked_bitmap)))
1251                         len = ARRAY_SIZE(masked_bitmap);
1252                 len = mask_bitmap4(bitmap, mask, masked_bitmap, len);
1253                 bitmap = masked_bitmap;
1254         }
1255         xdr_encode_bitmap4(xdr, bitmap, len);
1256 }
1257 
1258 static void encode_getfattr(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1259 {
1260         encode_getattr(xdr, nfs4_fattr_bitmap, bitmask,
1261                         ARRAY_SIZE(nfs4_fattr_bitmap), hdr);
1262 }
1263 
1264 static void encode_getfattr_open(struct xdr_stream *xdr, const u32 *bitmask,
1265                                  const u32 *open_bitmap,
1266                                  struct compound_hdr *hdr)
1267 {
1268         encode_getattr(xdr, open_bitmap, bitmask, 3, hdr);
1269 }
1270 
1271 static void encode_fsinfo(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1272 {
1273         encode_getattr(xdr, nfs4_fsinfo_bitmap, bitmask,
1274                         ARRAY_SIZE(nfs4_fsinfo_bitmap), hdr);
1275 }
1276 
1277 static void encode_fs_locations(struct xdr_stream *xdr, const u32* bitmask, struct compound_hdr *hdr)
1278 {
1279         encode_getattr(xdr, nfs4_fs_locations_bitmap, bitmask,
1280                         ARRAY_SIZE(nfs4_fs_locations_bitmap), hdr);
1281 }
1282 
1283 static void encode_getfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1284 {
1285         encode_op_hdr(xdr, OP_GETFH, decode_getfh_maxsz, hdr);
1286 }
1287 
1288 static void encode_link(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1289 {
1290         encode_op_hdr(xdr, OP_LINK, decode_link_maxsz, hdr);
1291         encode_string(xdr, name->len, name->name);
1292 }
1293 
1294 static inline int nfs4_lock_type(struct file_lock *fl, int block)
1295 {
1296         if (fl->fl_type == F_RDLCK)
1297                 return block ? NFS4_READW_LT : NFS4_READ_LT;
1298         return block ? NFS4_WRITEW_LT : NFS4_WRITE_LT;
1299 }
1300 
1301 static inline uint64_t nfs4_lock_length(struct file_lock *fl)
1302 {
1303         if (fl->fl_end == OFFSET_MAX)
1304                 return ~(uint64_t)0;
1305         return fl->fl_end - fl->fl_start + 1;
1306 }
1307 
1308 static void encode_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner)
1309 {
1310         __be32 *p;
1311 
1312         p = reserve_space(xdr, 32);
1313         p = xdr_encode_hyper(p, lowner->clientid);
1314         *p++ = cpu_to_be32(20);
1315         p = xdr_encode_opaque_fixed(p, "lock id:", 8);
1316         *p++ = cpu_to_be32(lowner->s_dev);
1317         xdr_encode_hyper(p, lowner->id);
1318 }
1319 
1320 /*
1321  * opcode,type,reclaim,offset,length,new_lock_owner = 32
1322  * open_seqid,open_stateid,lock_seqid,lock_owner.clientid, lock_owner.id = 40
1323  */
1324 static void encode_lock(struct xdr_stream *xdr, const struct nfs_lock_args *args, struct compound_hdr *hdr)
1325 {
1326         __be32 *p;
1327 
1328         encode_op_hdr(xdr, OP_LOCK, decode_lock_maxsz, hdr);
1329         p = reserve_space(xdr, 28);
1330         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, args->block));
1331         *p++ = cpu_to_be32(args->reclaim);
1332         p = xdr_encode_hyper(p, args->fl->fl_start);
1333         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1334         *p = cpu_to_be32(args->new_lock_owner);
1335         if (args->new_lock_owner){
1336                 encode_nfs4_seqid(xdr, args->open_seqid);
1337                 encode_nfs4_stateid(xdr, &args->open_stateid);
1338                 encode_nfs4_seqid(xdr, args->lock_seqid);
1339                 encode_lockowner(xdr, &args->lock_owner);
1340         }
1341         else {
1342                 encode_nfs4_stateid(xdr, &args->lock_stateid);
1343                 encode_nfs4_seqid(xdr, args->lock_seqid);
1344         }
1345 }
1346 
1347 static void encode_lockt(struct xdr_stream *xdr, const struct nfs_lockt_args *args, struct compound_hdr *hdr)
1348 {
1349         __be32 *p;
1350 
1351         encode_op_hdr(xdr, OP_LOCKT, decode_lockt_maxsz, hdr);
1352         p = reserve_space(xdr, 20);
1353         *p++ = cpu_to_be32(nfs4_lock_type(args->fl, 0));
1354         p = xdr_encode_hyper(p, args->fl->fl_start);
1355         p = xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1356         encode_lockowner(xdr, &args->lock_owner);
1357 }
1358 
1359 static void encode_locku(struct xdr_stream *xdr, const struct nfs_locku_args *args, struct compound_hdr *hdr)
1360 {
1361         __be32 *p;
1362 
1363         encode_op_hdr(xdr, OP_LOCKU, decode_locku_maxsz, hdr);
1364         encode_uint32(xdr, nfs4_lock_type(args->fl, 0));
1365         encode_nfs4_seqid(xdr, args->seqid);
1366         encode_nfs4_stateid(xdr, &args->stateid);
1367         p = reserve_space(xdr, 16);
1368         p = xdr_encode_hyper(p, args->fl->fl_start);
1369         xdr_encode_hyper(p, nfs4_lock_length(args->fl));
1370 }
1371 
1372 static void encode_release_lockowner(struct xdr_stream *xdr, const struct nfs_lowner *lowner, struct compound_hdr *hdr)
1373 {
1374         encode_op_hdr(xdr, OP_RELEASE_LOCKOWNER, decode_release_lockowner_maxsz, hdr);
1375         encode_lockowner(xdr, lowner);
1376 }
1377 
1378 static void encode_lookup(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1379 {
1380         encode_op_hdr(xdr, OP_LOOKUP, decode_lookup_maxsz, hdr);
1381         encode_string(xdr, name->len, name->name);
1382 }
1383 
1384 static void encode_lookupp(struct xdr_stream *xdr, struct compound_hdr *hdr)
1385 {
1386         encode_op_hdr(xdr, OP_LOOKUPP, decode_lookupp_maxsz, hdr);
1387 }
1388 
1389 static void encode_share_access(struct xdr_stream *xdr, u32 share_access)
1390 {
1391         __be32 *p;
1392 
1393         p = reserve_space(xdr, 8);
1394         *p++ = cpu_to_be32(share_access);
1395         *p = cpu_to_be32(0);            /* for linux, share_deny = 0 always */
1396 }
1397 
1398 static inline void encode_openhdr(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1399 {
1400         __be32 *p;
1401  /*
1402  * opcode 4, seqid 4, share_access 4, share_deny 4, clientid 8, ownerlen 4,
1403  * owner 4 = 32
1404  */
1405         encode_nfs4_seqid(xdr, arg->seqid);
1406         encode_share_access(xdr, arg->share_access);
1407         p = reserve_space(xdr, 36);
1408         p = xdr_encode_hyper(p, arg->clientid);
1409         *p++ = cpu_to_be32(24);
1410         p = xdr_encode_opaque_fixed(p, "open id:", 8);
1411         *p++ = cpu_to_be32(arg->server->s_dev);
1412         *p++ = cpu_to_be32(arg->id.uniquifier);
1413         xdr_encode_hyper(p, arg->id.create_time);
1414 }
1415 
1416 static inline void encode_createmode(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1417 {
1418         __be32 *p;
1419 
1420         p = reserve_space(xdr, 4);
1421         switch(arg->createmode) {
1422         case NFS4_CREATE_UNCHECKED:
1423                 *p = cpu_to_be32(NFS4_CREATE_UNCHECKED);
1424                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1425                                 arg->server, arg->server->attr_bitmask);
1426                 break;
1427         case NFS4_CREATE_GUARDED:
1428                 *p = cpu_to_be32(NFS4_CREATE_GUARDED);
1429                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1430                                 arg->server, arg->server->attr_bitmask);
1431                 break;
1432         case NFS4_CREATE_EXCLUSIVE:
1433                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE);
1434                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1435                 break;
1436         case NFS4_CREATE_EXCLUSIVE4_1:
1437                 *p = cpu_to_be32(NFS4_CREATE_EXCLUSIVE4_1);
1438                 encode_nfs4_verifier(xdr, &arg->u.verifier);
1439                 encode_attrs(xdr, arg->u.attrs, arg->label, &arg->umask,
1440                                 arg->server, arg->server->exclcreat_bitmask);
1441         }
1442 }
1443 
1444 static void encode_opentype(struct xdr_stream *xdr, const struct nfs_openargs *arg)
1445 {
1446         __be32 *p;
1447 
1448         p = reserve_space(xdr, 4);
1449         switch (arg->open_flags & O_CREAT) {
1450         case 0:
1451                 *p = cpu_to_be32(NFS4_OPEN_NOCREATE);
1452                 break;
1453         default:
1454                 *p = cpu_to_be32(NFS4_OPEN_CREATE);
1455                 encode_createmode(xdr, arg);
1456         }
1457 }
1458 
1459 static inline void encode_delegation_type(struct xdr_stream *xdr, fmode_t delegation_type)
1460 {
1461         __be32 *p;
1462 
1463         p = reserve_space(xdr, 4);
1464         switch (delegation_type) {
1465         case 0:
1466                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_NONE);
1467                 break;
1468         case FMODE_READ:
1469                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_READ);
1470                 break;
1471         case FMODE_WRITE|FMODE_READ:
1472                 *p = cpu_to_be32(NFS4_OPEN_DELEGATE_WRITE);
1473                 break;
1474         default:
1475                 BUG();
1476         }
1477 }
1478 
1479 static inline void encode_claim_null(struct xdr_stream *xdr, const struct qstr *name)
1480 {
1481         __be32 *p;
1482 
1483         p = reserve_space(xdr, 4);
1484         *p = cpu_to_be32(NFS4_OPEN_CLAIM_NULL);
1485         encode_string(xdr, name->len, name->name);
1486 }
1487 
1488 static inline void encode_claim_previous(struct xdr_stream *xdr, fmode_t type)
1489 {
1490         __be32 *p;
1491 
1492         p = reserve_space(xdr, 4);
1493         *p = cpu_to_be32(NFS4_OPEN_CLAIM_PREVIOUS);
1494         encode_delegation_type(xdr, type);
1495 }
1496 
1497 static inline void encode_claim_delegate_cur(struct xdr_stream *xdr, const struct qstr *name, const nfs4_stateid *stateid)
1498 {
1499         __be32 *p;
1500 
1501         p = reserve_space(xdr, 4);
1502         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEGATE_CUR);
1503         encode_nfs4_stateid(xdr, stateid);
1504         encode_string(xdr, name->len, name->name);
1505 }
1506 
1507 static inline void encode_claim_fh(struct xdr_stream *xdr)
1508 {
1509         __be32 *p;
1510 
1511         p = reserve_space(xdr, 4);
1512         *p = cpu_to_be32(NFS4_OPEN_CLAIM_FH);
1513 }
1514 
1515 static inline void encode_claim_delegate_cur_fh(struct xdr_stream *xdr, const nfs4_stateid *stateid)
1516 {
1517         __be32 *p;
1518 
1519         p = reserve_space(xdr, 4);
1520         *p = cpu_to_be32(NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1521         encode_nfs4_stateid(xdr, stateid);
1522 }
1523 
1524 static void encode_open(struct xdr_stream *xdr, const struct nfs_openargs *arg, struct compound_hdr *hdr)
1525 {
1526         encode_op_hdr(xdr, OP_OPEN, decode_open_maxsz, hdr);
1527         encode_openhdr(xdr, arg);
1528         encode_opentype(xdr, arg);
1529         switch (arg->claim) {
1530         case NFS4_OPEN_CLAIM_NULL:
1531                 encode_claim_null(xdr, arg->name);
1532                 break;
1533         case NFS4_OPEN_CLAIM_PREVIOUS:
1534                 encode_claim_previous(xdr, arg->u.delegation_type);
1535                 break;
1536         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1537                 encode_claim_delegate_cur(xdr, arg->name, &arg->u.delegation);
1538                 break;
1539         case NFS4_OPEN_CLAIM_FH:
1540                 encode_claim_fh(xdr);
1541                 break;
1542         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1543                 encode_claim_delegate_cur_fh(xdr, &arg->u.delegation);
1544                 break;
1545         default:
1546                 BUG();
1547         }
1548 }
1549 
1550 static void encode_open_confirm(struct xdr_stream *xdr, const struct nfs_open_confirmargs *arg, struct compound_hdr *hdr)
1551 {
1552         encode_op_hdr(xdr, OP_OPEN_CONFIRM, decode_open_confirm_maxsz, hdr);
1553         encode_nfs4_stateid(xdr, arg->stateid);
1554         encode_nfs4_seqid(xdr, arg->seqid);
1555 }
1556 
1557 static void encode_open_downgrade(struct xdr_stream *xdr, const struct nfs_closeargs *arg, struct compound_hdr *hdr)
1558 {
1559         encode_op_hdr(xdr, OP_OPEN_DOWNGRADE, decode_open_downgrade_maxsz, hdr);
1560         encode_nfs4_stateid(xdr, &arg->stateid);
1561         encode_nfs4_seqid(xdr, arg->seqid);
1562         encode_share_access(xdr, arg->share_access);
1563 }
1564 
1565 static void
1566 encode_putfh(struct xdr_stream *xdr, const struct nfs_fh *fh, struct compound_hdr *hdr)
1567 {
1568         encode_op_hdr(xdr, OP_PUTFH, decode_putfh_maxsz, hdr);
1569         encode_string(xdr, fh->size, fh->data);
1570 }
1571 
1572 static void encode_putrootfh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1573 {
1574         encode_op_hdr(xdr, OP_PUTROOTFH, decode_putrootfh_maxsz, hdr);
1575 }
1576 
1577 static void encode_read(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1578                         struct compound_hdr *hdr)
1579 {
1580         __be32 *p;
1581 
1582         encode_op_hdr(xdr, OP_READ, decode_read_maxsz, hdr);
1583         encode_nfs4_stateid(xdr, &args->stateid);
1584 
1585         p = reserve_space(xdr, 12);
1586         p = xdr_encode_hyper(p, args->offset);
1587         *p = cpu_to_be32(args->count);
1588 }
1589 
1590 static void encode_readdir(struct xdr_stream *xdr, const struct nfs4_readdir_arg *readdir, struct rpc_rqst *req, struct compound_hdr *hdr)
1591 {
1592         uint32_t attrs[3] = {
1593                 FATTR4_WORD0_RDATTR_ERROR,
1594                 FATTR4_WORD1_MOUNTED_ON_FILEID,
1595         };
1596         uint32_t dircount = readdir->count >> 1;
1597         __be32 *p, verf[2];
1598         uint32_t attrlen = 0;
1599         unsigned int i;
1600 
1601         if (readdir->plus) {
1602                 attrs[0] |= FATTR4_WORD0_TYPE|FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE|
1603                         FATTR4_WORD0_FSID|FATTR4_WORD0_FILEHANDLE|FATTR4_WORD0_FILEID;
1604                 attrs[1] |= FATTR4_WORD1_MODE|FATTR4_WORD1_NUMLINKS|FATTR4_WORD1_OWNER|
1605                         FATTR4_WORD1_OWNER_GROUP|FATTR4_WORD1_RAWDEV|
1606                         FATTR4_WORD1_SPACE_USED|FATTR4_WORD1_TIME_ACCESS|
1607                         FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1608                 attrs[2] |= FATTR4_WORD2_SECURITY_LABEL;
1609                 dircount >>= 1;
1610         }
1611         /* Use mounted_on_fileid only if the server supports it */
1612         if (!(readdir->bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID))
1613                 attrs[0] |= FATTR4_WORD0_FILEID;
1614         for (i = 0; i < ARRAY_SIZE(attrs); i++) {
1615                 attrs[i] &= readdir->bitmask[i];
1616                 if (attrs[i] != 0)
1617                         attrlen = i+1;
1618         }
1619 
1620         encode_op_hdr(xdr, OP_READDIR, decode_readdir_maxsz, hdr);
1621         encode_uint64(xdr, readdir->cookie);
1622         encode_nfs4_verifier(xdr, &readdir->verifier);
1623         p = reserve_space(xdr, 12 + (attrlen << 2));
1624         *p++ = cpu_to_be32(dircount);
1625         *p++ = cpu_to_be32(readdir->count);
1626         *p++ = cpu_to_be32(attrlen);
1627         for (i = 0; i < attrlen; i++)
1628                 *p++ = cpu_to_be32(attrs[i]);
1629         memcpy(verf, readdir->verifier.data, sizeof(verf));
1630 
1631         dprintk("%s: cookie = %llu, verifier = %08x:%08x, bitmap = %08x:%08x:%08x\n",
1632                         __func__,
1633                         (unsigned long long)readdir->cookie,
1634                         verf[0], verf[1],
1635                         attrs[0] & readdir->bitmask[0],
1636                         attrs[1] & readdir->bitmask[1],
1637                         attrs[2] & readdir->bitmask[2]);
1638 }
1639 
1640 static void encode_readlink(struct xdr_stream *xdr, const struct nfs4_readlink *readlink, struct rpc_rqst *req, struct compound_hdr *hdr)
1641 {
1642         encode_op_hdr(xdr, OP_READLINK, decode_readlink_maxsz, hdr);
1643 }
1644 
1645 static void encode_remove(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1646 {
1647         encode_op_hdr(xdr, OP_REMOVE, decode_remove_maxsz, hdr);
1648         encode_string(xdr, name->len, name->name);
1649 }
1650 
1651 static void encode_rename(struct xdr_stream *xdr, const struct qstr *oldname, const struct qstr *newname, struct compound_hdr *hdr)
1652 {
1653         encode_op_hdr(xdr, OP_RENAME, decode_rename_maxsz, hdr);
1654         encode_string(xdr, oldname->len, oldname->name);
1655         encode_string(xdr, newname->len, newname->name);
1656 }
1657 
1658 static void encode_renew(struct xdr_stream *xdr, clientid4 clid,
1659                          struct compound_hdr *hdr)
1660 {
1661         encode_op_hdr(xdr, OP_RENEW, decode_renew_maxsz, hdr);
1662         encode_uint64(xdr, clid);
1663 }
1664 
1665 static void
1666 encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1667 {
1668         encode_op_hdr(xdr, OP_RESTOREFH, decode_restorefh_maxsz, hdr);
1669 }
1670 
1671 static void
1672 encode_setacl(struct xdr_stream *xdr, const struct nfs_setaclargs *arg,
1673                 struct compound_hdr *hdr)
1674 {
1675         __be32 *p;
1676 
1677         encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
1678         encode_nfs4_stateid(xdr, &zero_stateid);
1679         p = reserve_space(xdr, 2*4);
1680         *p++ = cpu_to_be32(1);
1681         *p = cpu_to_be32(FATTR4_WORD0_ACL);
1682         p = reserve_space(xdr, 4);
1683         *p = cpu_to_be32(arg->acl_len);
1684         xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
1685 }
1686 
1687 static void
1688 encode_savefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
1689 {
1690         encode_op_hdr(xdr, OP_SAVEFH, decode_savefh_maxsz, hdr);
1691 }
1692 
1693 static void encode_setattr(struct xdr_stream *xdr, const struct nfs_setattrargs *arg, const struct nfs_server *server, struct compound_hdr *hdr)
1694 {
1695         encode_op_hdr(xdr, OP_SETATTR, decode_setattr_maxsz, hdr);
1696         encode_nfs4_stateid(xdr, &arg->stateid);
1697         encode_attrs(xdr, arg->iap, arg->label, NULL, server,
1698                         server->attr_bitmask);
1699 }
1700 
1701 static void encode_setclientid(struct xdr_stream *xdr, const struct nfs4_setclientid *setclientid, struct compound_hdr *hdr)
1702 {
1703         __be32 *p;
1704 
1705         encode_op_hdr(xdr, OP_SETCLIENTID, decode_setclientid_maxsz, hdr);
1706         encode_nfs4_verifier(xdr, setclientid->sc_verifier);
1707 
1708         encode_string(xdr, strlen(setclientid->sc_clnt->cl_owner_id),
1709                         setclientid->sc_clnt->cl_owner_id);
1710         p = reserve_space(xdr, 4);
1711         *p = cpu_to_be32(setclientid->sc_prog);
1712         encode_string(xdr, setclientid->sc_netid_len, setclientid->sc_netid);
1713         encode_string(xdr, setclientid->sc_uaddr_len, setclientid->sc_uaddr);
1714         p = reserve_space(xdr, 4);
1715         *p = cpu_to_be32(setclientid->sc_clnt->cl_cb_ident);
1716 }
1717 
1718 static void encode_setclientid_confirm(struct xdr_stream *xdr, const struct nfs4_setclientid_res *arg, struct compound_hdr *hdr)
1719 {
1720         encode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM,
1721                         decode_setclientid_confirm_maxsz, hdr);
1722         encode_uint64(xdr, arg->clientid);
1723         encode_nfs4_verifier(xdr, &arg->confirm);
1724 }
1725 
1726 static void encode_write(struct xdr_stream *xdr, const struct nfs_pgio_args *args,
1727                          struct compound_hdr *hdr)
1728 {
1729         __be32 *p;
1730 
1731         encode_op_hdr(xdr, OP_WRITE, decode_write_maxsz, hdr);
1732         encode_nfs4_stateid(xdr, &args->stateid);
1733 
1734         p = reserve_space(xdr, 16);
1735         p = xdr_encode_hyper(p, args->offset);
1736         *p++ = cpu_to_be32(args->stable);
1737         *p = cpu_to_be32(args->count);
1738 
1739         xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
1740 }
1741 
1742 static void encode_delegreturn(struct xdr_stream *xdr, const nfs4_stateid *stateid, struct compound_hdr *hdr)
1743 {
1744         encode_op_hdr(xdr, OP_DELEGRETURN, decode_delegreturn_maxsz, hdr);
1745         encode_nfs4_stateid(xdr, stateid);
1746 }
1747 
1748 static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, struct compound_hdr *hdr)
1749 {
1750         encode_op_hdr(xdr, OP_SECINFO, decode_secinfo_maxsz, hdr);
1751         encode_string(xdr, name->len, name->name);
1752 }
1753 
1754 #if defined(CONFIG_NFS_V4_1)
1755 /* NFSv4.1 operations */
1756 static void encode_bind_conn_to_session(struct xdr_stream *xdr,
1757                                    const struct nfs41_bind_conn_to_session_args *args,
1758                                    struct compound_hdr *hdr)
1759 {
1760         __be32 *p;
1761 
1762         encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
1763                 decode_bind_conn_to_session_maxsz, hdr);
1764         encode_opaque_fixed(xdr, args->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1765         p = xdr_reserve_space(xdr, 8);
1766         *p++ = cpu_to_be32(args->dir);
1767         *p = (args->use_conn_in_rdma_mode) ? cpu_to_be32(1) : cpu_to_be32(0);
1768 }
1769 
1770 static void encode_op_map(struct xdr_stream *xdr, const struct nfs4_op_map *op_map)
1771 {
1772         unsigned int i;
1773         encode_uint32(xdr, NFS4_OP_MAP_NUM_WORDS);
1774         for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++)
1775                 encode_uint32(xdr, op_map->u.words[i]);
1776 }
1777 
1778 static void encode_exchange_id(struct xdr_stream *xdr,
1779                                const struct nfs41_exchange_id_args *args,
1780                                struct compound_hdr *hdr)
1781 {
1782         __be32 *p;
1783         char impl_name[IMPL_NAME_LIMIT];
1784         int len = 0;
1785 
1786         encode_op_hdr(xdr, OP_EXCHANGE_ID, decode_exchange_id_maxsz, hdr);
1787         encode_nfs4_verifier(xdr, &args->verifier);
1788 
1789         encode_string(xdr, strlen(args->client->cl_owner_id),
1790                         args->client->cl_owner_id);
1791 
1792         encode_uint32(xdr, args->flags);
1793         encode_uint32(xdr, args->state_protect.how);
1794 
1795         switch (args->state_protect.how) {
1796         case SP4_NONE:
1797                 break;
1798         case SP4_MACH_CRED:
1799                 encode_op_map(xdr, &args->state_protect.enforce);
1800                 encode_op_map(xdr, &args->state_protect.allow);
1801                 break;
1802         default:
1803                 WARN_ON_ONCE(1);
1804                 break;
1805         }
1806 
1807         if (send_implementation_id &&
1808             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) > 1 &&
1809             sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN)
1810                 <= sizeof(impl_name) + 1)
1811                 len = snprintf(impl_name, sizeof(impl_name), "%s %s %s %s",
1812                                utsname()->sysname, utsname()->release,
1813                                utsname()->version, utsname()->machine);
1814 
1815         if (len > 0) {
1816                 encode_uint32(xdr, 1);  /* implementation id array length=1 */
1817 
1818                 encode_string(xdr,
1819                         sizeof(CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN) - 1,
1820                         CONFIG_NFS_V4_1_IMPLEMENTATION_ID_DOMAIN);
1821                 encode_string(xdr, len, impl_name);
1822                 /* just send zeros for nii_date - the date is in nii_name */
1823                 p = reserve_space(xdr, 12);
1824                 p = xdr_encode_hyper(p, 0);
1825                 *p = cpu_to_be32(0);
1826         } else
1827                 encode_uint32(xdr, 0);  /* implementation id array length=0 */
1828 }
1829 
1830 static void encode_create_session(struct xdr_stream *xdr,
1831                                   const struct nfs41_create_session_args *args,
1832                                   struct compound_hdr *hdr)
1833 {
1834         __be32 *p;
1835         struct nfs_client *clp = args->client;
1836         struct rpc_clnt *clnt = clp->cl_rpcclient;
1837         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
1838         u32 max_resp_sz_cached;
1839 
1840         /*
1841          * Assumes OPEN is the biggest non-idempotent compound.
1842          * 2 is the verifier.
1843          */
1844         max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
1845                                 * XDR_UNIT + RPC_MAX_AUTH_SIZE;
1846 
1847         encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
1848         p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);
1849         p = xdr_encode_hyper(p, args->clientid);
1850         *p++ = cpu_to_be32(args->seqid);                        /*Sequence id */
1851         *p++ = cpu_to_be32(args->flags);                        /*flags */
1852 
1853         /* Fore Channel */
1854         *p++ = cpu_to_be32(0);                          /* header padding size */
1855         *p++ = cpu_to_be32(args->fc_attrs.max_rqst_sz); /* max req size */
1856         *p++ = cpu_to_be32(args->fc_attrs.max_resp_sz); /* max resp size */
1857         *p++ = cpu_to_be32(max_resp_sz_cached);         /* Max resp sz cached */
1858         *p++ = cpu_to_be32(args->fc_attrs.max_ops);     /* max operations */
1859         *p++ = cpu_to_be32(args->fc_attrs.max_reqs);    /* max requests */
1860         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1861 
1862         /* Back Channel */
1863         *p++ = cpu_to_be32(0);                          /* header padding size */
1864         *p++ = cpu_to_be32(args->bc_attrs.max_rqst_sz); /* max req size */
1865         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz); /* max resp size */
1866         *p++ = cpu_to_be32(args->bc_attrs.max_resp_sz_cached);  /* Max resp sz cached */
1867         *p++ = cpu_to_be32(args->bc_attrs.max_ops);     /* max operations */
1868         *p++ = cpu_to_be32(args->bc_attrs.max_reqs);    /* max requests */
1869         *p++ = cpu_to_be32(0);                          /* rdmachannel_attrs */
1870 
1871         *p++ = cpu_to_be32(args->cb_program);           /* cb_program */
1872         *p++ = cpu_to_be32(1);
1873         *p++ = cpu_to_be32(RPC_AUTH_UNIX);                      /* auth_sys */
1874 
1875         /* authsys_parms rfc1831 */
1876         *p++ = cpu_to_be32(ktime_to_ns(nn->boot_time)); /* stamp */
1877         p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
1878         *p++ = cpu_to_be32(0);                          /* UID */
1879         *p++ = cpu_to_be32(0);                          /* GID */
1880         *p = cpu_to_be32(0);                            /* No more gids */
1881 }
1882 
1883 static void encode_destroy_session(struct xdr_stream *xdr,
1884                                    const struct nfs4_session *session,
1885                                    struct compound_hdr *hdr)
1886 {
1887         encode_op_hdr(xdr, OP_DESTROY_SESSION, decode_destroy_session_maxsz, hdr);
1888         encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1889 }
1890 
1891 static void encode_destroy_clientid(struct xdr_stream *xdr,
1892                                    uint64_t clientid,
1893                                    struct compound_hdr *hdr)
1894 {
1895         encode_op_hdr(xdr, OP_DESTROY_CLIENTID, decode_destroy_clientid_maxsz, hdr);
1896         encode_uint64(xdr, clientid);
1897 }
1898 
1899 static void encode_reclaim_complete(struct xdr_stream *xdr,
1900                                     const struct nfs41_reclaim_complete_args *args,
1901                                     struct compound_hdr *hdr)
1902 {
1903         encode_op_hdr(xdr, OP_RECLAIM_COMPLETE, decode_reclaim_complete_maxsz, hdr);
1904         encode_uint32(xdr, args->one_fs);
1905 }
1906 #endif /* CONFIG_NFS_V4_1 */
1907 
1908 static void encode_sequence(struct xdr_stream *xdr,
1909                             const struct nfs4_sequence_args *args,
1910                             struct compound_hdr *hdr)
1911 {
1912 #if defined(CONFIG_NFS_V4_1)
1913         struct nfs4_session *session;
1914         struct nfs4_slot_table *tp;
1915         struct nfs4_slot *slot = args->sa_slot;
1916         __be32 *p;
1917 
1918         tp = slot->table;
1919         session = tp->session;
1920         if (!session)
1921                 return;
1922 
1923         encode_op_hdr(xdr, OP_SEQUENCE, decode_sequence_maxsz, hdr);
1924 
1925         /*
1926          * Sessionid + seqid + slotid + max slotid + cache_this
1927          */
1928         dprintk("%s: sessionid=%u:%u:%u:%u seqid=%d slotid=%d "
1929                 "max_slotid=%d cache_this=%d\n",
1930                 __func__,
1931                 ((u32 *)session->sess_id.data)[0],
1932                 ((u32 *)session->sess_id.data)[1],
1933                 ((u32 *)session->sess_id.data)[2],
1934                 ((u32 *)session->sess_id.data)[3],
1935                 slot->seq_nr, slot->slot_nr,
1936                 tp->highest_used_slotid, args->sa_cache_this);
1937         p = reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 16);
1938         p = xdr_encode_opaque_fixed(p, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
1939         *p++ = cpu_to_be32(slot->seq_nr);
1940         *p++ = cpu_to_be32(slot->slot_nr);
1941         *p++ = cpu_to_be32(tp->highest_used_slotid);
1942         *p = cpu_to_be32(args->sa_cache_this);
1943 #endif /* CONFIG_NFS_V4_1 */
1944 }
1945 
1946 #ifdef CONFIG_NFS_V4_1
1947 static void
1948 encode_getdeviceinfo(struct xdr_stream *xdr,
1949                      const struct nfs4_getdeviceinfo_args *args,
1950                      struct compound_hdr *hdr)
1951 {
1952         __be32 *p;
1953 
1954         encode_op_hdr(xdr, OP_GETDEVICEINFO, decode_getdeviceinfo_maxsz, hdr);
1955         p = reserve_space(xdr, NFS4_DEVICEID4_SIZE + 4 + 4);
1956         p = xdr_encode_opaque_fixed(p, args->pdev->dev_id.data,
1957                                     NFS4_DEVICEID4_SIZE);
1958         *p++ = cpu_to_be32(args->pdev->layout_type);
1959         *p++ = cpu_to_be32(args->pdev->maxcount);       /* gdia_maxcount */
1960 
1961         p = reserve_space(xdr, 4 + 4);
1962         *p++ = cpu_to_be32(1);                  /* bitmap length */
1963         *p++ = cpu_to_be32(args->notify_types);
1964 }
1965 
1966 static void
1967 encode_layoutget(struct xdr_stream *xdr,
1968                       const struct nfs4_layoutget_args *args,
1969                       struct compound_hdr *hdr)
1970 {
1971         __be32 *p;
1972 
1973         encode_op_hdr(xdr, OP_LAYOUTGET, decode_layoutget_maxsz, hdr);
1974         p = reserve_space(xdr, 36);
1975         *p++ = cpu_to_be32(0);     /* Signal layout available */
1976         *p++ = cpu_to_be32(args->type);
1977         *p++ = cpu_to_be32(args->range.iomode);
1978         p = xdr_encode_hyper(p, args->range.offset);
1979         p = xdr_encode_hyper(p, args->range.length);
1980         p = xdr_encode_hyper(p, args->minlength);
1981         encode_nfs4_stateid(xdr, &args->stateid);
1982         encode_uint32(xdr, args->maxcount);
1983 
1984         dprintk("%s: 1st type:0x%x iomode:%d off:%lu len:%lu mc:%d\n",
1985                 __func__,
1986                 args->type,
1987                 args->range.iomode,
1988                 (unsigned long)args->range.offset,
1989                 (unsigned long)args->range.length,
1990                 args->maxcount);
1991 }
1992 
1993 static int
1994 encode_layoutcommit(struct xdr_stream *xdr,
1995                     struct inode *inode,
1996                     const struct nfs4_layoutcommit_args *args,
1997                     struct compound_hdr *hdr)
1998 {
1999         __be32 *p;
2000 
2001         dprintk("%s: lbw: %llu type: %d\n", __func__, args->lastbytewritten,
2002                 NFS_SERVER(args->inode)->pnfs_curr_ld->id);
2003 
2004         encode_op_hdr(xdr, OP_LAYOUTCOMMIT, decode_layoutcommit_maxsz, hdr);
2005         p = reserve_space(xdr, 20);
2006         /* Only whole file layouts */
2007         p = xdr_encode_hyper(p, 0); /* offset */
2008         p = xdr_encode_hyper(p, args->lastbytewritten + 1);     /* length */
2009         *p = cpu_to_be32(0); /* reclaim */
2010         encode_nfs4_stateid(xdr, &args->stateid);
2011         if (args->lastbytewritten != U64_MAX) {
2012                 p = reserve_space(xdr, 20);
2013                 *p++ = cpu_to_be32(1); /* newoffset = TRUE */
2014                 p = xdr_encode_hyper(p, args->lastbytewritten);
2015         } else {
2016                 p = reserve_space(xdr, 12);
2017                 *p++ = cpu_to_be32(0); /* newoffset = FALSE */
2018         }
2019         *p++ = cpu_to_be32(0); /* Never send time_modify_changed */
2020         *p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */
2021 
2022         encode_uint32(xdr, args->layoutupdate_len);
2023         if (args->layoutupdate_pages)
2024                 xdr_write_pages(xdr, args->layoutupdate_pages, 0,
2025                                 args->layoutupdate_len);
2026 
2027         return 0;
2028 }
2029 
2030 static void
2031 encode_layoutreturn(struct xdr_stream *xdr,
2032                     const struct nfs4_layoutreturn_args *args,
2033                     struct compound_hdr *hdr)
2034 {
2035         __be32 *p;
2036 
2037         encode_op_hdr(xdr, OP_LAYOUTRETURN, decode_layoutreturn_maxsz, hdr);
2038         p = reserve_space(xdr, 16);
2039         *p++ = cpu_to_be32(0);          /* reclaim. always 0 for now */
2040         *p++ = cpu_to_be32(args->layout_type);
2041         *p++ = cpu_to_be32(args->range.iomode);
2042         *p = cpu_to_be32(RETURN_FILE);
2043         p = reserve_space(xdr, 16);
2044         p = xdr_encode_hyper(p, args->range.offset);
2045         p = xdr_encode_hyper(p, args->range.length);
2046         spin_lock(&args->inode->i_lock);
2047         encode_nfs4_stateid(xdr, &args->stateid);
2048         spin_unlock(&args->inode->i_lock);
2049         if (args->ld_private->ops && args->ld_private->ops->encode)
2050                 args->ld_private->ops->encode(xdr, args, args->ld_private);
2051         else
2052                 encode_uint32(xdr, 0);
2053 }
2054 
2055 static int
2056 encode_secinfo_no_name(struct xdr_stream *xdr,
2057                        const struct nfs41_secinfo_no_name_args *args,
2058                        struct compound_hdr *hdr)
2059 {
2060         encode_op_hdr(xdr, OP_SECINFO_NO_NAME, decode_secinfo_no_name_maxsz, hdr);
2061         encode_uint32(xdr, args->style);
2062         return 0;
2063 }
2064 
2065 static void encode_test_stateid(struct xdr_stream *xdr,
2066                                 const struct nfs41_test_stateid_args *args,
2067                                 struct compound_hdr *hdr)
2068 {
2069         encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
2070         encode_uint32(xdr, 1);
2071         encode_nfs4_stateid(xdr, args->stateid);
2072 }
2073 
2074 static void encode_free_stateid(struct xdr_stream *xdr,
2075                                 const struct nfs41_free_stateid_args *args,
2076                                 struct compound_hdr *hdr)
2077 {
2078         encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
2079         encode_nfs4_stateid(xdr, &args->stateid);
2080 }
2081 #else
2082 static inline void
2083 encode_layoutreturn(struct xdr_stream *xdr,
2084                     const struct nfs4_layoutreturn_args *args,
2085                     struct compound_hdr *hdr)
2086 {
2087 }
2088 
2089 static void
2090 encode_layoutget(struct xdr_stream *xdr,
2091                       const struct nfs4_layoutget_args *args,
2092                       struct compound_hdr *hdr)
2093 {
2094 }
2095 #endif /* CONFIG_NFS_V4_1 */
2096 
2097 /*
2098  * END OF "GENERIC" ENCODE ROUTINES.
2099  */
2100 
2101 static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
2102 {
2103 #if defined(CONFIG_NFS_V4_1)
2104         struct nfs4_session *session = args->sa_slot->table->session;
2105         if (session)
2106                 return session->clp->cl_mvops->minor_version;
2107 #endif /* CONFIG_NFS_V4_1 */
2108         return 0;
2109 }
2110 
2111 /*
2112  * Encode an ACCESS request
2113  */
2114 static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
2115                                 const void *data)
2116 {
2117         const struct nfs4_accessargs *args = data;
2118         struct compound_hdr hdr = {
2119                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2120         };
2121 
2122         encode_compound_hdr(xdr, req, &hdr);
2123         encode_sequence(xdr, &args->seq_args, &hdr);
2124         encode_putfh(xdr, args->fh, &hdr);
2125         encode_access(xdr, args->access, &hdr);
2126         if (args->bitmask)
2127                 encode_getfattr(xdr, args->bitmask, &hdr);
2128         encode_nops(&hdr);
2129 }
2130 
2131 /*
2132  * Encode LOOKUP request
2133  */
2134 static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
2135                                 const void *data)
2136 {
2137         const struct nfs4_lookup_arg *args = data;
2138         struct compound_hdr hdr = {
2139                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2140         };
2141 
2142         encode_compound_hdr(xdr, req, &hdr);
2143         encode_sequence(xdr, &args->seq_args, &hdr);
2144         encode_putfh(xdr, args->dir_fh, &hdr);
2145         encode_lookup(xdr, args->name, &hdr);
2146         encode_getfh(xdr, &hdr);
2147         encode_getfattr(xdr, args->bitmask, &hdr);
2148         encode_nops(&hdr);
2149 }
2150 
2151 /*
2152  * Encode LOOKUPP request
2153  */
2154 static void nfs4_xdr_enc_lookupp(struct rpc_rqst *req, struct xdr_stream *xdr,
2155                 const void *data)
2156 {
2157         const struct nfs4_lookupp_arg *args = data;
2158         struct compound_hdr hdr = {
2159                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2160         };
2161 
2162         encode_compound_hdr(xdr, req, &hdr);
2163         encode_sequence(xdr, &args->seq_args, &hdr);
2164         encode_putfh(xdr, args->fh, &hdr);
2165         encode_lookupp(xdr, &hdr);
2166         encode_getfh(xdr, &hdr);
2167         encode_getfattr(xdr, args->bitmask, &hdr);
2168         encode_nops(&hdr);
2169 }
2170 
2171 /*
2172  * Encode LOOKUP_ROOT request
2173  */
2174 static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
2175                                      struct xdr_stream *xdr,
2176                                      const void *data)
2177 {
2178         const struct nfs4_lookup_root_arg *args = data;
2179         struct compound_hdr hdr = {
2180                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2181         };
2182 
2183         encode_compound_hdr(xdr, req, &hdr);
2184         encode_sequence(xdr, &args->seq_args, &hdr);
2185         encode_putrootfh(xdr, &hdr);
2186         encode_getfh(xdr, &hdr);
2187         encode_getfattr(xdr, args->bitmask, &hdr);
2188         encode_nops(&hdr);
2189 }
2190 
2191 /*
2192  * Encode REMOVE request
2193  */
2194 static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
2195                                 const void *data)
2196 {
2197         const struct nfs_removeargs *args = data;
2198         struct compound_hdr hdr = {
2199                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2200         };
2201 
2202         encode_compound_hdr(xdr, req, &hdr);
2203         encode_sequence(xdr, &args->seq_args, &hdr);
2204         encode_putfh(xdr, args->fh, &hdr);
2205         encode_remove(xdr, &args->name, &hdr);
2206         encode_nops(&hdr);
2207 }
2208 
2209 /*
2210  * Encode RENAME request
2211  */
2212 static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
2213                                 const void *data)
2214 {
2215         const struct nfs_renameargs *args = data;
2216         struct compound_hdr hdr = {
2217                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2218         };
2219 
2220         encode_compound_hdr(xdr, req, &hdr);
2221         encode_sequence(xdr, &args->seq_args, &hdr);
2222         encode_putfh(xdr, args->old_dir, &hdr);
2223         encode_savefh(xdr, &hdr);
2224         encode_putfh(xdr, args->new_dir, &hdr);
2225         encode_rename(xdr, args->old_name, args->new_name, &hdr);
2226         encode_nops(&hdr);
2227 }
2228 
2229 /*
2230  * Encode LINK request
2231  */
2232 static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
2233                               const void *data)
2234 {
2235         const struct nfs4_link_arg *args = data;
2236         struct compound_hdr hdr = {
2237                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2238         };
2239 
2240         encode_compound_hdr(xdr, req, &hdr);
2241         encode_sequence(xdr, &args->seq_args, &hdr);
2242         encode_putfh(xdr, args->fh, &hdr);
2243         encode_savefh(xdr, &hdr);
2244         encode_putfh(xdr, args->dir_fh, &hdr);
2245         encode_link(xdr, args->name, &hdr);
2246         encode_restorefh(xdr, &hdr);
2247         encode_getfattr(xdr, args->bitmask, &hdr);
2248         encode_nops(&hdr);
2249 }
2250 
2251 /*
2252  * Encode CREATE request
2253  */
2254 static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
2255                                 const void *data)
2256 {
2257         const struct nfs4_create_arg *args = data;
2258         struct compound_hdr hdr = {
2259                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2260         };
2261 
2262         encode_compound_hdr(xdr, req, &hdr);
2263         encode_sequence(xdr, &args->seq_args, &hdr);
2264         encode_putfh(xdr, args->dir_fh, &hdr);
2265         encode_create(xdr, args, &hdr);
2266         encode_getfh(xdr, &hdr);
2267         encode_getfattr(xdr, args->bitmask, &hdr);
2268         encode_nops(&hdr);
2269 }
2270 
2271 /*
2272  * Encode SYMLINK request
2273  */
2274 static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2275                                  const void *data)
2276 {
2277         const struct nfs4_create_arg *args = data;
2278 
2279         nfs4_xdr_enc_create(req, xdr, args);
2280 }
2281 
2282 /*
2283  * Encode GETATTR request
2284  */
2285 static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2286                                  const void *data)
2287 {
2288         const struct nfs4_getattr_arg *args = data;
2289         struct compound_hdr hdr = {
2290                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2291         };
2292 
2293         encode_compound_hdr(xdr, req, &hdr);
2294         encode_sequence(xdr, &args->seq_args, &hdr);
2295         encode_putfh(xdr, args->fh, &hdr);
2296         encode_getfattr(xdr, args->bitmask, &hdr);
2297         encode_nops(&hdr);
2298 }
2299 
2300 /*
2301  * Encode a CLOSE request
2302  */
2303 static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
2304                                const void *data)
2305 {
2306         const struct nfs_closeargs *args = data;
2307         struct compound_hdr hdr = {
2308                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2309         };
2310 
2311         encode_compound_hdr(xdr, req, &hdr);
2312         encode_sequence(xdr, &args->seq_args, &hdr);
2313         encode_putfh(xdr, args->fh, &hdr);
2314         if (args->lr_args)
2315                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2316         if (args->bitmask != NULL)
2317                 encode_getfattr(xdr, args->bitmask, &hdr);
2318         encode_close(xdr, args, &hdr);
2319         encode_nops(&hdr);
2320 }
2321 
2322 /*
2323  * Encode an OPEN request
2324  */
2325 static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
2326                               const void *data)
2327 {
2328         const struct nfs_openargs *args = data;
2329         struct compound_hdr hdr = {
2330                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2331         };
2332 
2333         encode_compound_hdr(xdr, req, &hdr);
2334         encode_sequence(xdr, &args->seq_args, &hdr);
2335         encode_putfh(xdr, args->fh, &hdr);
2336         encode_open(xdr, args, &hdr);
2337         encode_getfh(xdr, &hdr);
2338         if (args->access)
2339                 encode_access(xdr, args->access, &hdr);
2340         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2341         if (args->lg_args) {
2342                 encode_layoutget(xdr, args->lg_args, &hdr);
2343                 xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2344                                  args->lg_args->layout.pages,
2345                                  0, args->lg_args->layout.pglen);
2346         }
2347         encode_nops(&hdr);
2348 }
2349 
2350 /*
2351  * Encode an OPEN_CONFIRM request
2352  */
2353 static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
2354                                       struct xdr_stream *xdr,
2355                                       const void *data)
2356 {
2357         const struct nfs_open_confirmargs *args = data;
2358         struct compound_hdr hdr = {
2359                 .nops   = 0,
2360         };
2361 
2362         encode_compound_hdr(xdr, req, &hdr);
2363         encode_putfh(xdr, args->fh, &hdr);
2364         encode_open_confirm(xdr, args, &hdr);
2365         encode_nops(&hdr);
2366 }
2367 
2368 /*
2369  * Encode an OPEN request with no attributes.
2370  */
2371 static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
2372                                      struct xdr_stream *xdr,
2373                                      const void *data)
2374 {
2375         const struct nfs_openargs *args = data;
2376         struct compound_hdr hdr = {
2377                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2378         };
2379 
2380         encode_compound_hdr(xdr, req, &hdr);
2381         encode_sequence(xdr, &args->seq_args, &hdr);
2382         encode_putfh(xdr, args->fh, &hdr);
2383         encode_open(xdr, args, &hdr);
2384         if (args->access)
2385                 encode_access(xdr, args->access, &hdr);
2386         encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
2387         if (args->lg_args) {
2388                 encode_layoutget(xdr, args->lg_args, &hdr);
2389                 xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2390                                  args->lg_args->layout.pages,
2391                                  0, args->lg_args->layout.pglen);
2392         }
2393         encode_nops(&hdr);
2394 }
2395 
2396 /*
2397  * Encode an OPEN_DOWNGRADE request
2398  */
2399 static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
2400                                         struct xdr_stream *xdr,
2401                                         const void *data)
2402 {
2403         const struct nfs_closeargs *args = data;
2404         struct compound_hdr hdr = {
2405                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2406         };
2407 
2408         encode_compound_hdr(xdr, req, &hdr);
2409         encode_sequence(xdr, &args->seq_args, &hdr);
2410         encode_putfh(xdr, args->fh, &hdr);
2411         if (args->lr_args)
2412                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2413         encode_open_downgrade(xdr, args, &hdr);
2414         encode_nops(&hdr);
2415 }
2416 
2417 /*
2418  * Encode a LOCK request
2419  */
2420 static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
2421                               const void *data)
2422 {
2423         const struct nfs_lock_args *args = data;
2424         struct compound_hdr hdr = {
2425                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2426         };
2427 
2428         encode_compound_hdr(xdr, req, &hdr);
2429         encode_sequence(xdr, &args->seq_args, &hdr);
2430         encode_putfh(xdr, args->fh, &hdr);
2431         encode_lock(xdr, args, &hdr);
2432         encode_nops(&hdr);
2433 }
2434 
2435 /*
2436  * Encode a LOCKT request
2437  */
2438 static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
2439                                const void *data)
2440 {
2441         const struct nfs_lockt_args *args = data;
2442         struct compound_hdr hdr = {
2443                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2444         };
2445 
2446         encode_compound_hdr(xdr, req, &hdr);
2447         encode_sequence(xdr, &args->seq_args, &hdr);
2448         encode_putfh(xdr, args->fh, &hdr);
2449         encode_lockt(xdr, args, &hdr);
2450         encode_nops(&hdr);
2451 }
2452 
2453 /*
2454  * Encode a LOCKU request
2455  */
2456 static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
2457                                const void *data)
2458 {
2459         const struct nfs_locku_args *args = data;
2460         struct compound_hdr hdr = {
2461                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2462         };
2463 
2464         encode_compound_hdr(xdr, req, &hdr);
2465         encode_sequence(xdr, &args->seq_args, &hdr);
2466         encode_putfh(xdr, args->fh, &hdr);
2467         encode_locku(xdr, args, &hdr);
2468         encode_nops(&hdr);
2469 }
2470 
2471 static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
2472                                            struct xdr_stream *xdr,
2473                                            const void *data)
2474 {
2475         const struct nfs_release_lockowner_args *args = data;
2476         struct compound_hdr hdr = {
2477                 .minorversion = 0,
2478         };
2479 
2480         encode_compound_hdr(xdr, req, &hdr);
2481         encode_release_lockowner(xdr, &args->lock_owner, &hdr);
2482         encode_nops(&hdr);
2483 }
2484 
2485 /*
2486  * Encode a READLINK request
2487  */
2488 static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
2489                                   const void *data)
2490 {
2491         const struct nfs4_readlink *args = data;
2492         struct compound_hdr hdr = {
2493                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2494         };
2495 
2496         encode_compound_hdr(xdr, req, &hdr);
2497         encode_sequence(xdr, &args->seq_args, &hdr);
2498         encode_putfh(xdr, args->fh, &hdr);
2499         encode_readlink(xdr, args, req, &hdr);
2500 
2501         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2502                         args->pgbase, args->pglen);
2503         encode_nops(&hdr);
2504 }
2505 
2506 /*
2507  * Encode a READDIR request
2508  */
2509 static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
2510                                  const void *data)
2511 {
2512         const struct nfs4_readdir_arg *args = data;
2513         struct compound_hdr hdr = {
2514                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2515         };
2516 
2517         encode_compound_hdr(xdr, req, &hdr);
2518         encode_sequence(xdr, &args->seq_args, &hdr);
2519         encode_putfh(xdr, args->fh, &hdr);
2520         encode_readdir(xdr, args, req, &hdr);
2521 
2522         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
2523                          args->pgbase, args->count);
2524         dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
2525                         __func__, hdr.replen << 2, args->pages,
2526                         args->pgbase, args->count);
2527         encode_nops(&hdr);
2528 }
2529 
2530 /*
2531  * Encode a READ request
2532  */
2533 static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
2534                               const void *data)
2535 {
2536         const struct nfs_pgio_args *args = data;
2537         struct compound_hdr hdr = {
2538                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2539         };
2540 
2541         encode_compound_hdr(xdr, req, &hdr);
2542         encode_sequence(xdr, &args->seq_args, &hdr);
2543         encode_putfh(xdr, args->fh, &hdr);
2544         encode_read(xdr, args, &hdr);
2545 
2546         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
2547                          args->pages, args->pgbase, args->count);
2548         req->rq_rcv_buf.flags |= XDRBUF_READ;
2549         encode_nops(&hdr);
2550 }
2551 
2552 /*
2553  * Encode an SETATTR request
2554  */
2555 static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
2556                                  const void *data)
2557 {
2558         const struct nfs_setattrargs *args = data;
2559         struct compound_hdr hdr = {
2560                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2561         };
2562 
2563         encode_compound_hdr(xdr, req, &hdr);
2564         encode_sequence(xdr, &args->seq_args, &hdr);
2565         encode_putfh(xdr, args->fh, &hdr);
2566         encode_setattr(xdr, args, args->server, &hdr);
2567         encode_getfattr(xdr, args->bitmask, &hdr);
2568         encode_nops(&hdr);
2569 }
2570 
2571 /*
2572  * Encode a GETACL request
2573  */
2574 static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
2575                                 const void *data)
2576 {
2577         const struct nfs_getaclargs *args = data;
2578         struct compound_hdr hdr = {
2579                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2580         };
2581         const __u32 nfs4_acl_bitmap[1] = {
2582                 [0] = FATTR4_WORD0_ACL,
2583         };
2584         uint32_t replen;
2585 
2586         encode_compound_hdr(xdr, req, &hdr);
2587         encode_sequence(xdr, &args->seq_args, &hdr);
2588         encode_putfh(xdr, args->fh, &hdr);
2589         replen = hdr.replen + op_decode_hdr_maxsz;
2590         encode_getattr(xdr, nfs4_acl_bitmap, NULL,
2591                         ARRAY_SIZE(nfs4_acl_bitmap), &hdr);
2592 
2593         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2594                 args->acl_pages, 0, args->acl_len);
2595 
2596         encode_nops(&hdr);
2597 }
2598 
2599 /*
2600  * Encode a WRITE request
2601  */
2602 static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
2603                                const void *data)
2604 {
2605         const struct nfs_pgio_args *args = data;
2606         struct compound_hdr hdr = {
2607                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2608         };
2609 
2610         encode_compound_hdr(xdr, req, &hdr);
2611         encode_sequence(xdr, &args->seq_args, &hdr);
2612         encode_putfh(xdr, args->fh, &hdr);
2613         encode_write(xdr, args, &hdr);
2614         req->rq_snd_buf.flags |= XDRBUF_WRITE;
2615         if (args->bitmask)
2616                 encode_getfattr(xdr, args->bitmask, &hdr);
2617         encode_nops(&hdr);
2618 }
2619 
2620 /*
2621  *  a COMMIT request
2622  */
2623 static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
2624                                 const void *data)
2625 {
2626         const struct nfs_commitargs *args = data;
2627         struct compound_hdr hdr = {
2628                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2629         };
2630 
2631         encode_compound_hdr(xdr, req, &hdr);
2632         encode_sequence(xdr, &args->seq_args, &hdr);
2633         encode_putfh(xdr, args->fh, &hdr);
2634         encode_commit(xdr, args, &hdr);
2635         encode_nops(&hdr);
2636 }
2637 
2638 /*
2639  * FSINFO request
2640  */
2641 static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
2642                                 const void *data)
2643 {
2644         const struct nfs4_fsinfo_arg *args = data;
2645         struct compound_hdr hdr = {
2646                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2647         };
2648 
2649         encode_compound_hdr(xdr, req, &hdr);
2650         encode_sequence(xdr, &args->seq_args, &hdr);
2651         encode_putfh(xdr, args->fh, &hdr);
2652         encode_fsinfo(xdr, args->bitmask, &hdr);
2653         encode_nops(&hdr);
2654 }
2655 
2656 /*
2657  * a PATHCONF request
2658  */
2659 static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
2660                                   const void *data)
2661 {
2662         const struct nfs4_pathconf_arg *args = data;
2663         struct compound_hdr hdr = {
2664                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2665         };
2666 
2667         encode_compound_hdr(xdr, req, &hdr);
2668         encode_sequence(xdr, &args->seq_args, &hdr);
2669         encode_putfh(xdr, args->fh, &hdr);
2670         encode_getattr(xdr, nfs4_pathconf_bitmap, args->bitmask,
2671                         ARRAY_SIZE(nfs4_pathconf_bitmap), &hdr);
2672         encode_nops(&hdr);
2673 }
2674 
2675 /*
2676  * a STATFS request
2677  */
2678 static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
2679                                 const void *data)
2680 {
2681         const struct nfs4_statfs_arg *args = data;
2682         struct compound_hdr hdr = {
2683                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2684         };
2685 
2686         encode_compound_hdr(xdr, req, &hdr);
2687         encode_sequence(xdr, &args->seq_args, &hdr);
2688         encode_putfh(xdr, args->fh, &hdr);
2689         encode_getattr(xdr, nfs4_statfs_bitmap, args->bitmask,
2690                         ARRAY_SIZE(nfs4_statfs_bitmap), &hdr);
2691         encode_nops(&hdr);
2692 }
2693 
2694 /*
2695  * GETATTR_BITMAP request
2696  */
2697 static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
2698                                      struct xdr_stream *xdr,
2699                                      const void *data)
2700 {
2701         const struct nfs4_server_caps_arg *args = data;
2702         const u32 *bitmask = args->bitmask;
2703         struct compound_hdr hdr = {
2704                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2705         };
2706 
2707         encode_compound_hdr(xdr, req, &hdr);
2708         encode_sequence(xdr, &args->seq_args, &hdr);
2709         encode_putfh(xdr, args->fhandle, &hdr);
2710         encode_getattr(xdr, bitmask, NULL, 3, &hdr);
2711         encode_nops(&hdr);
2712 }
2713 
2714 /*
2715  * a RENEW request
2716  */
2717 static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
2718                                const void *data)
2719 
2720 {
2721         const struct nfs_client *clp = data;
2722         struct compound_hdr hdr = {
2723                 .nops   = 0,
2724         };
2725 
2726         encode_compound_hdr(xdr, req, &hdr);
2727         encode_renew(xdr, clp->cl_clientid, &hdr);
2728         encode_nops(&hdr);
2729 }
2730 
2731 /*
2732  * a SETCLIENTID request
2733  */
2734 static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
2735                                      struct xdr_stream *xdr,
2736                                      const void *data)
2737 {
2738         const struct nfs4_setclientid *sc = data;
2739         struct compound_hdr hdr = {
2740                 .nops   = 0,
2741         };
2742 
2743         encode_compound_hdr(xdr, req, &hdr);
2744         encode_setclientid(xdr, sc, &hdr);
2745         encode_nops(&hdr);
2746 }
2747 
2748 /*
2749  * a SETCLIENTID_CONFIRM request
2750  */
2751 static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
2752                                              struct xdr_stream *xdr,
2753                                              const void *data)
2754 {
2755         const struct nfs4_setclientid_res *arg = data;
2756         struct compound_hdr hdr = {
2757                 .nops   = 0,
2758         };
2759 
2760         encode_compound_hdr(xdr, req, &hdr);
2761         encode_setclientid_confirm(xdr, arg, &hdr);
2762         encode_nops(&hdr);
2763 }
2764 
2765 /*
2766  * DELEGRETURN request
2767  */
2768 static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
2769                                      struct xdr_stream *xdr,
2770                                      const void *data)
2771 {
2772         const struct nfs4_delegreturnargs *args = data;
2773         struct compound_hdr hdr = {
2774                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2775         };
2776 
2777         encode_compound_hdr(xdr, req, &hdr);
2778         encode_sequence(xdr, &args->seq_args, &hdr);
2779         encode_putfh(xdr, args->fhandle, &hdr);
2780         if (args->lr_args)
2781                 encode_layoutreturn(xdr, args->lr_args, &hdr);
2782         if (args->bitmask)
2783                 encode_getfattr(xdr, args->bitmask, &hdr);
2784         encode_delegreturn(xdr, args->stateid, &hdr);
2785         encode_nops(&hdr);
2786 }
2787 
2788 /*
2789  * Encode FS_LOCATIONS request
2790  */
2791 static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
2792                                       struct xdr_stream *xdr,
2793                                       const void *data)
2794 {
2795         const struct nfs4_fs_locations_arg *args = data;
2796         struct compound_hdr hdr = {
2797                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2798         };
2799         uint32_t replen;
2800 
2801         encode_compound_hdr(xdr, req, &hdr);
2802         encode_sequence(xdr, &args->seq_args, &hdr);
2803         if (args->migration) {
2804                 encode_putfh(xdr, args->fh, &hdr);
2805                 replen = hdr.replen;
2806                 encode_fs_locations(xdr, args->bitmask, &hdr);
2807                 if (args->renew)
2808                         encode_renew(xdr, args->clientid, &hdr);
2809         } else {
2810                 encode_putfh(xdr, args->dir_fh, &hdr);
2811                 encode_lookup(xdr, args->name, &hdr);
2812                 replen = hdr.replen;
2813                 encode_fs_locations(xdr, args->bitmask, &hdr);
2814         }
2815 
2816         /* Set up reply kvec to capture returned fs_locations array. */
2817         xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
2818                          (struct page **)&args->page, 0, PAGE_SIZE);
2819         encode_nops(&hdr);
2820 }
2821 
2822 /*
2823  * Encode SECINFO request
2824  */
2825 static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
2826                                 struct xdr_stream *xdr,
2827                                 const void *data)
2828 {
2829         const struct nfs4_secinfo_arg *args = data;
2830         struct compound_hdr hdr = {
2831                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2832         };
2833 
2834         encode_compound_hdr(xdr, req, &hdr);
2835         encode_sequence(xdr, &args->seq_args, &hdr);
2836         encode_putfh(xdr, args->dir_fh, &hdr);
2837         encode_secinfo(xdr, args->name, &hdr);
2838         encode_nops(&hdr);
2839 }
2840 
2841 /*
2842  * Encode FSID_PRESENT request
2843  */
2844 static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
2845                                       struct xdr_stream *xdr,
2846                                       const void *data)
2847 {
2848         const struct nfs4_fsid_present_arg *args = data;
2849         struct compound_hdr hdr = {
2850                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
2851         };
2852 
2853         encode_compound_hdr(xdr, req, &hdr);
2854         encode_sequence(xdr, &args->seq_args, &hdr);
2855         encode_putfh(xdr, args->fh, &hdr);
2856         encode_getfh(xdr, &hdr);
2857         if (args->renew)
2858                 encode_renew(xdr, args->clientid, &hdr);
2859         encode_nops(&hdr);
2860 }
2861 
2862 #if defined(CONFIG_NFS_V4_1)
2863 /*
2864  * BIND_CONN_TO_SESSION request
2865  */
2866 static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
2867                                 struct xdr_stream *xdr,
2868                                 const void *data)
2869 {
2870         const struct nfs41_bind_conn_to_session_args *args = data;
2871         struct compound_hdr hdr = {
2872                 .minorversion = args->client->cl_mvops->minor_version,
2873         };
2874 
2875         encode_compound_hdr(xdr, req, &hdr);
2876         encode_bind_conn_to_session(xdr, args, &hdr);
2877         encode_nops(&hdr);
2878 }
2879 
2880 /*
2881  * EXCHANGE_ID request
2882  */
2883 static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
2884                                      struct xdr_stream *xdr,
2885                                      const void *data)
2886 {
2887         const struct nfs41_exchange_id_args *args = data;
2888         struct compound_hdr hdr = {
2889                 .minorversion = args->client->cl_mvops->minor_version,
2890         };
2891 
2892         encode_compound_hdr(xdr, req, &hdr);
2893         encode_exchange_id(xdr, args, &hdr);
2894         encode_nops(&hdr);
2895 }
2896 
2897 /*
2898  * a CREATE_SESSION request
2899  */
2900 static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
2901                                         struct xdr_stream *xdr,
2902                                         const void *data)
2903 {
2904         const struct nfs41_create_session_args *args = data;
2905         struct compound_hdr hdr = {
2906                 .minorversion = args->client->cl_mvops->minor_version,
2907         };
2908 
2909         encode_compound_hdr(xdr, req, &hdr);
2910         encode_create_session(xdr, args, &hdr);
2911         encode_nops(&hdr);
2912 }
2913 
2914 /*
2915  * a DESTROY_SESSION request
2916  */
2917 static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
2918                                          struct xdr_stream *xdr,
2919                                          const void *data)
2920 {
2921         const struct nfs4_session *session = data;
2922         struct compound_hdr hdr = {
2923                 .minorversion = session->clp->cl_mvops->minor_version,
2924         };
2925 
2926         encode_compound_hdr(xdr, req, &hdr);
2927         encode_destroy_session(xdr, session, &hdr);
2928         encode_nops(&hdr);
2929 }
2930 
2931 /*
2932  * a DESTROY_CLIENTID request
2933  */
2934 static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
2935                                          struct xdr_stream *xdr,
2936                                          const void *data)
2937 {
2938         const struct nfs_client *clp = data;
2939         struct compound_hdr hdr = {
2940                 .minorversion = clp->cl_mvops->minor_version,
2941         };
2942 
2943         encode_compound_hdr(xdr, req, &hdr);
2944         encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
2945         encode_nops(&hdr);
2946 }
2947 
2948 /*
2949  * a SEQUENCE request
2950  */
2951 static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
2952                                   const void *data)
2953 {
2954         const struct nfs4_sequence_args *args = data;
2955         struct compound_hdr hdr = {
2956                 .minorversion = nfs4_xdr_minorversion(args),
2957         };
2958 
2959         encode_compound_hdr(xdr, req, &hdr);
2960         encode_sequence(xdr, args, &hdr);
2961         encode_nops(&hdr);
2962 }
2963 
2964 /*
2965  * a GET_LEASE_TIME request
2966  */
2967 static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
2968                                         struct xdr_stream *xdr,
2969                                         const void *data)
2970 {
2971         const struct nfs4_get_lease_time_args *args = data;
2972         struct compound_hdr hdr = {
2973                 .minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
2974         };
2975         const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
2976 
2977         encode_compound_hdr(xdr, req, &hdr);
2978         encode_sequence(xdr, &args->la_seq_args, &hdr);
2979         encode_putrootfh(xdr, &hdr);
2980         encode_fsinfo(xdr, lease_bitmap, &hdr);
2981         encode_nops(&hdr);
2982 }
2983 
2984 /*
2985  * a RECLAIM_COMPLETE request
2986  */
2987 static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
2988                                           struct xdr_stream *xdr,
2989                                           const void *data)
2990 {
2991         const struct nfs41_reclaim_complete_args *args = data;
2992         struct compound_hdr hdr = {
2993                 .minorversion = nfs4_xdr_minorversion(&args->seq_args)
2994         };
2995 
2996         encode_compound_hdr(xdr, req, &hdr);
2997         encode_sequence(xdr, &args->seq_args, &hdr);
2998         encode_reclaim_complete(xdr, args, &hdr);
2999         encode_nops(&hdr);
3000 }
3001 
3002 /*
3003  * Encode GETDEVICEINFO request
3004  */
3005 static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
3006                                        struct xdr_stream *xdr,
3007                                        const void *data)
3008 {
3009         const struct nfs4_getdeviceinfo_args *args = data;
3010         struct compound_hdr hdr = {
3011                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3012         };
3013 
3014         encode_compound_hdr(xdr, req, &hdr);
3015         encode_sequence(xdr, &args->seq_args, &hdr);
3016         encode_getdeviceinfo(xdr, args, &hdr);
3017 
3018         /* set up reply kvec. Subtract notification bitmap max size (2)
3019          * so that notification bitmap is put in xdr_buf tail */
3020         xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
3021                          args->pdev->pages, args->pdev->pgbase,
3022                          args->pdev->pglen);
3023 
3024         encode_nops(&hdr);
3025 }
3026 
3027 /*
3028  *  Encode LAYOUTGET request
3029  */
3030 static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
3031                                    struct xdr_stream *xdr,
3032                                    const void *data)
3033 {
3034         const struct nfs4_layoutget_args *args = data;
3035         struct compound_hdr hdr = {
3036                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3037         };
3038 
3039         encode_compound_hdr(xdr, req, &hdr);
3040         encode_sequence(xdr, &args->seq_args, &hdr);
3041         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3042         encode_layoutget(xdr, args, &hdr);
3043 
3044         xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
3045             args->layout.pages, 0, args->layout.pglen);
3046 
3047         encode_nops(&hdr);
3048 }
3049 
3050 /*
3051  *  Encode LAYOUTCOMMIT request
3052  */
3053 static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
3054                                       struct xdr_stream *xdr,
3055                                       const void *priv)
3056 {
3057         const struct nfs4_layoutcommit_args *args = priv;
3058         struct nfs4_layoutcommit_data *data =
3059                 container_of(args, struct nfs4_layoutcommit_data, args);
3060         struct compound_hdr hdr = {
3061                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3062         };
3063 
3064         encode_compound_hdr(xdr, req, &hdr);
3065         encode_sequence(xdr, &args->seq_args, &hdr);
3066         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3067         encode_layoutcommit(xdr, data->args.inode, args, &hdr);
3068         encode_getfattr(xdr, args->bitmask, &hdr);
3069         encode_nops(&hdr);
3070 }
3071 
3072 /*
3073  * Encode LAYOUTRETURN request
3074  */
3075 static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
3076                                       struct xdr_stream *xdr,
3077                                       const void *data)
3078 {
3079         const struct nfs4_layoutreturn_args *args = data;
3080         struct compound_hdr hdr = {
3081                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3082         };
3083 
3084         encode_compound_hdr(xdr, req, &hdr);
3085         encode_sequence(xdr, &args->seq_args, &hdr);
3086         encode_putfh(xdr, NFS_FH(args->inode), &hdr);
3087         encode_layoutreturn(xdr, args, &hdr);
3088         encode_nops(&hdr);
3089 }
3090 
3091 /*
3092  * Encode SECINFO_NO_NAME request
3093  */
3094 static void nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
3095                                         struct xdr_stream *xdr,
3096                                         const void *data)
3097 {
3098         const struct nfs41_secinfo_no_name_args *args = data;
3099         struct compound_hdr hdr = {
3100                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3101         };
3102 
3103         encode_compound_hdr(xdr, req, &hdr);
3104         encode_sequence(xdr, &args->seq_args, &hdr);
3105         encode_putrootfh(xdr, &hdr);
3106         encode_secinfo_no_name(xdr, args, &hdr);
3107         encode_nops(&hdr);
3108 }
3109 
3110 /*
3111  *  Encode TEST_STATEID request
3112  */
3113 static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
3114                                       struct xdr_stream *xdr,
3115                                       const void *data)
3116 {
3117         const struct nfs41_test_stateid_args *args = data;
3118         struct compound_hdr hdr = {
3119                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3120         };
3121 
3122         encode_compound_hdr(xdr, req, &hdr);
3123         encode_sequence(xdr, &args->seq_args, &hdr);
3124         encode_test_stateid(xdr, args, &hdr);
3125         encode_nops(&hdr);
3126 }
3127 
3128 /*
3129  *  Encode FREE_STATEID request
3130  */
3131 static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
3132                                      struct xdr_stream *xdr,
3133                                      const void *data)
3134 {
3135         const struct nfs41_free_stateid_args *args = data;
3136         struct compound_hdr hdr = {
3137                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
3138         };
3139 
3140         encode_compound_hdr(xdr, req, &hdr);
3141         encode_sequence(xdr, &args->seq_args, &hdr);
3142         encode_free_stateid(xdr, args, &hdr);
3143         encode_nops(&hdr);
3144 }
3145 #endif /* CONFIG_NFS_V4_1 */
3146 
3147 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
3148 {
3149         dprintk("nfs: %s: prematurely hit end of receive buffer. "
3150                 "Remaining buffer length is %tu words.\n",
3151                 func, xdr->end - xdr->p);
3152 }
3153 
3154 static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
3155 {
3156         ssize_t ret = xdr_stream_decode_opaque_inline(xdr, (void **)string,
3157                         NFS4_OPAQUE_LIMIT);
3158         if (unlikely(ret < 0)) {
3159                 if (ret == -EBADMSG)
3160                         print_overflow_msg(__func__, xdr);
3161                 return -EIO;
3162         }
3163         *len = ret;
3164         return 0;
3165 }
3166 
3167 static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
3168 {
3169         __be32 *p;
3170 
3171         p = xdr_inline_decode(xdr, 8);
3172         if (unlikely(!p))
3173                 goto out_overflow;
3174         hdr->status = be32_to_cpup(p++);
3175         hdr->taglen = be32_to_cpup(p);
3176 
3177         p = xdr_inline_decode(xdr, hdr->taglen + 4);
3178         if (unlikely(!p))
3179                 goto out_overflow;
3180         hdr->tag = (char *)p;
3181         p += XDR_QUADLEN(hdr->taglen);
3182         hdr->nops = be32_to_cpup(p);
3183         if (unlikely(hdr->nops < 1))
3184                 return nfs4_stat_to_errno(hdr->status);
3185         return 0;
3186 out_overflow:
3187         print_overflow_msg(__func__, xdr);
3188         return -EIO;
3189 }
3190 
3191 static bool __decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected,
3192                 int *nfs_retval)
3193 {
3194         __be32 *p;
3195         uint32_t opnum;
3196         int32_t nfserr;
3197 
3198         p = xdr_inline_decode(xdr, 8);
3199         if (unlikely(!p))
3200                 goto out_overflow;
3201         opnum = be32_to_cpup(p++);
3202         if (unlikely(opnum != expected))
3203                 goto out_bad_operation;
3204         nfserr = be32_to_cpup(p);
3205         if (nfserr == NFS_OK)
3206                 *nfs_retval = 0;
3207         else
3208                 *nfs_retval = nfs4_stat_to_errno(nfserr);
3209         return true;
3210 out_bad_operation:
3211         dprintk("nfs: Server returned operation"
3212                 " %d but we issued a request for %d\n",
3213                         opnum, expected);
3214         *nfs_retval = -EREMOTEIO;
3215         return false;
3216 out_overflow:
3217         print_overflow_msg(__func__, xdr);
3218         *nfs_retval = -EIO;
3219         return false;
3220 }
3221 
3222 static int decode_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
3223 {
3224         int retval;
3225 
3226         __decode_op_hdr(xdr, expected, &retval);
3227         return retval;
3228 }
3229 
3230 /* Dummy routine */
3231 static int decode_ace(struct xdr_stream *xdr, void *ace)
3232 {
3233         __be32 *p;
3234         unsigned int strlen;
3235         char *str;
3236 
3237         p = xdr_inline_decode(xdr, 12);
3238         if (likely(p))
3239                 return decode_opaque_inline(xdr, &strlen, &str);
3240         print_overflow_msg(__func__, xdr);
3241         return -EIO;
3242 }
3243 
3244 static ssize_t
3245 decode_bitmap4(struct xdr_stream *xdr, uint32_t *bitmap, size_t sz)
3246 {
3247         ssize_t ret;
3248 
3249         ret = xdr_stream_decode_uint32_array(xdr, bitmap, sz);
3250         if (likely(ret >= 0))
3251                 return ret;
3252         if (ret == -EMSGSIZE)
3253                 return sz;
3254         print_overflow_msg(__func__, xdr);
3255         return -EIO;
3256 }
3257 
3258 static int decode_attr_bitmap(struct xdr_stream *xdr, uint32_t *bitmap)
3259 {
3260         ssize_t ret;
3261         ret = decode_bitmap4(xdr, bitmap, 3);
3262         return ret < 0 ? ret : 0;
3263 }
3264 
3265 static int decode_attr_length(struct xdr_stream *xdr, uint32_t *attrlen, unsigned int *savep)
3266 {
3267         __be32 *p;
3268 
3269         p = xdr_inline_decode(xdr, 4);
3270         if (unlikely(!p))
3271                 goto out_overflow;
3272         *attrlen = be32_to_cpup(p);
3273         *savep = xdr_stream_pos(xdr);
3274         return 0;
3275 out_overflow:
3276         print_overflow_msg(__func__, xdr);
3277         return -EIO;
3278 }
3279 
3280 static int decode_attr_supported(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *bitmask)
3281 {
3282         if (likely(bitmap[0] & FATTR4_WORD0_SUPPORTED_ATTRS)) {
3283                 int ret;
3284                 ret = decode_attr_bitmap(xdr, bitmask);
3285                 if (unlikely(ret < 0))
3286                         return ret;
3287                 bitmap[0] &= ~FATTR4_WORD0_SUPPORTED_ATTRS;
3288         } else
3289                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3290         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3291                 bitmask[0], bitmask[1], bitmask[2]);
3292         return 0;
3293 }
3294 
3295 static int decode_attr_type(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *type)
3296 {
3297         __be32 *p;
3298         int ret = 0;
3299 
3300         *type = 0;
3301         if (unlikely(bitmap[0] & (FATTR4_WORD0_TYPE - 1U)))
3302                 return -EIO;
3303         if (likely(bitmap[0] & FATTR4_WORD0_TYPE)) {
3304                 p = xdr_inline_decode(xdr, 4);
3305                 if (unlikely(!p))
3306                         goto out_overflow;
3307                 *type = be32_to_cpup(p);
3308                 if (*type < NF4REG || *type > NF4NAMEDATTR) {
3309                         dprintk("%s: bad type %d\n", __func__, *type);
3310                         return -EIO;
3311                 }
3312                 bitmap[0] &= ~FATTR4_WORD0_TYPE;
3313                 ret = NFS_ATTR_FATTR_TYPE;
3314         }
3315         dprintk("%s: type=0%o\n", __func__, nfs_type2fmt[*type]);
3316         return ret;
3317 out_overflow:
3318         print_overflow_msg(__func__, xdr);
3319         return -EIO;
3320 }
3321 
3322 static int decode_attr_fh_expire_type(struct xdr_stream *xdr,
3323                                       uint32_t *bitmap, uint32_t *type)
3324 {
3325         __be32 *p;
3326 
3327         *type = 0;
3328         if (unlikely(bitmap[0] & (FATTR4_WORD0_FH_EXPIRE_TYPE - 1U)))
3329                 return -EIO;
3330         if (likely(bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE)) {
3331                 p = xdr_inline_decode(xdr, 4);
3332                 if (unlikely(!p))
3333                         goto out_overflow;
3334                 *type = be32_to_cpup(p);
3335                 bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
3336         }
3337         dprintk("%s: expire type=0x%x\n", __func__, *type);
3338         return 0;
3339 out_overflow:
3340         print_overflow_msg(__func__, xdr);
3341         return -EIO;
3342 }
3343 
3344 static int decode_attr_change(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *change)
3345 {
3346         __be32 *p;
3347         int ret = 0;
3348 
3349         *change = 0;
3350         if (unlikely(bitmap[0] & (FATTR4_WORD0_CHANGE - 1U)))
3351                 return -EIO;
3352         if (likely(bitmap[0] & FATTR4_WORD0_CHANGE)) {
3353                 p = xdr_inline_decode(xdr, 8);
3354                 if (unlikely(!p))
3355                         goto out_overflow;
3356                 xdr_decode_hyper(p, change);
3357                 bitmap[0] &= ~FATTR4_WORD0_CHANGE;
3358                 ret = NFS_ATTR_FATTR_CHANGE;
3359         }
3360         dprintk("%s: change attribute=%Lu\n", __func__,
3361                         (unsigned long long)*change);
3362         return ret;
3363 out_overflow:
3364         print_overflow_msg(__func__, xdr);
3365         return -EIO;
3366 }
3367 
3368 static int decode_attr_size(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *size)
3369 {
3370         __be32 *p;
3371         int ret = 0;
3372 
3373         *size = 0;
3374         if (unlikely(bitmap[0] & (FATTR4_WORD0_SIZE - 1U)))
3375                 return -EIO;
3376         if (likely(bitmap[0] & FATTR4_WORD0_SIZE)) {
3377                 p = xdr_inline_decode(xdr, 8);
3378                 if (unlikely(!p))
3379                         goto out_overflow;
3380                 xdr_decode_hyper(p, size);
3381                 bitmap[0] &= ~FATTR4_WORD0_SIZE;
3382                 ret = NFS_ATTR_FATTR_SIZE;
3383         }
3384         dprintk("%s: file size=%Lu\n", __func__, (unsigned long long)*size);
3385         return ret;
3386 out_overflow:
3387         print_overflow_msg(__func__, xdr);
3388         return -EIO;
3389 }
3390 
3391 static int decode_attr_link_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3392 {
3393         __be32 *p;
3394 
3395         *res = 0;
3396         if (unlikely(bitmap[0] & (FATTR4_WORD0_LINK_SUPPORT - 1U)))
3397                 return -EIO;
3398         if (likely(bitmap[0] & FATTR4_WORD0_LINK_SUPPORT)) {
3399                 p = xdr_inline_decode(xdr, 4);
3400                 if (unlikely(!p))
3401                         goto out_overflow;
3402                 *res = be32_to_cpup(p);
3403                 bitmap[0] &= ~FATTR4_WORD0_LINK_SUPPORT;
3404         }
3405         dprintk("%s: link support=%s\n", __func__, *res == 0 ? "false" : "true");
3406         return 0;
3407 out_overflow:
3408         print_overflow_msg(__func__, xdr);
3409         return -EIO;
3410 }
3411 
3412 static int decode_attr_symlink_support(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3413 {
3414         __be32 *p;
3415 
3416         *res = 0;
3417         if (unlikely(bitmap[0] & (FATTR4_WORD0_SYMLINK_SUPPORT - 1U)))
3418                 return -EIO;
3419         if (likely(bitmap[0] & FATTR4_WORD0_SYMLINK_SUPPORT)) {
3420                 p = xdr_inline_decode(xdr, 4);
3421                 if (unlikely(!p))
3422                         goto out_overflow;
3423                 *res = be32_to_cpup(p);
3424                 bitmap[0] &= ~FATTR4_WORD0_SYMLINK_SUPPORT;
3425         }
3426         dprintk("%s: symlink support=%s\n", __func__, *res == 0 ? "false" : "true");
3427         return 0;
3428 out_overflow:
3429         print_overflow_msg(__func__, xdr);
3430         return -EIO;
3431 }
3432 
3433 static int decode_attr_fsid(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fsid *fsid)
3434 {
3435         __be32 *p;
3436         int ret = 0;
3437 
3438         fsid->major = 0;
3439         fsid->minor = 0;
3440         if (unlikely(bitmap[0] & (FATTR4_WORD0_FSID - 1U)))
3441                 return -EIO;
3442         if (likely(bitmap[0] & FATTR4_WORD0_FSID)) {
3443                 p = xdr_inline_decode(xdr, 16);
3444                 if (unlikely(!p))
3445                         goto out_overflow;
3446                 p = xdr_decode_hyper(p, &fsid->major);
3447                 xdr_decode_hyper(p, &fsid->minor);
3448                 bitmap[0] &= ~FATTR4_WORD0_FSID;
3449                 ret = NFS_ATTR_FATTR_FSID;
3450         }
3451         dprintk("%s: fsid=(0x%Lx/0x%Lx)\n", __func__,
3452                         (unsigned long long)fsid->major,
3453                         (unsigned long long)fsid->minor);
3454         return ret;
3455 out_overflow:
3456         print_overflow_msg(__func__, xdr);
3457         return -EIO;
3458 }
3459 
3460 static int decode_attr_lease_time(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3461 {
3462         __be32 *p;
3463 
3464         *res = 60;
3465         if (unlikely(bitmap[0] & (FATTR4_WORD0_LEASE_TIME - 1U)))
3466                 return -EIO;
3467         if (likely(bitmap[0] & FATTR4_WORD0_LEASE_TIME)) {
3468                 p = xdr_inline_decode(xdr, 4);
3469                 if (unlikely(!p))
3470                         goto out_overflow;
3471                 *res = be32_to_cpup(p);
3472                 bitmap[0] &= ~FATTR4_WORD0_LEASE_TIME;
3473         }
3474         dprintk("%s: file size=%u\n", __func__, (unsigned int)*res);
3475         return 0;
3476 out_overflow:
3477         print_overflow_msg(__func__, xdr);
3478         return -EIO;
3479 }
3480 
3481 static int decode_attr_error(struct xdr_stream *xdr, uint32_t *bitmap, int32_t *res)
3482 {
3483         __be32 *p;
3484 
3485         if (unlikely(bitmap[0] & (FATTR4_WORD0_RDATTR_ERROR - 1U)))
3486                 return -EIO;
3487         if (likely(bitmap[0] & FATTR4_WORD0_RDATTR_ERROR)) {
3488                 p = xdr_inline_decode(xdr, 4);
3489                 if (unlikely(!p))
3490                         goto out_overflow;
3491                 bitmap[0] &= ~FATTR4_WORD0_RDATTR_ERROR;
3492                 *res = -be32_to_cpup(p);
3493         }
3494         return 0;
3495 out_overflow:
3496         print_overflow_msg(__func__, xdr);
3497         return -EIO;
3498 }
3499 
3500 static int decode_attr_exclcreat_supported(struct xdr_stream *xdr,
3501                                  uint32_t *bitmap, uint32_t *bitmask)
3502 {
3503         if (likely(bitmap[2] & FATTR4_WORD2_SUPPATTR_EXCLCREAT)) {
3504                 int ret;
3505                 ret = decode_attr_bitmap(xdr, bitmask);
3506                 if (unlikely(ret < 0))
3507                         return ret;
3508                 bitmap[2] &= ~FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3509         } else
3510                 bitmask[0] = bitmask[1] = bitmask[2] = 0;
3511         dprintk("%s: bitmask=%08x:%08x:%08x\n", __func__,
3512                 bitmask[0], bitmask[1], bitmask[2]);
3513         return 0;
3514 }
3515 
3516 static int decode_attr_filehandle(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs_fh *fh)
3517 {
3518         __be32 *p;
3519         int len;
3520 
3521         if (fh != NULL)
3522                 memset(fh, 0, sizeof(*fh));
3523 
3524         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEHANDLE - 1U)))
3525                 return -EIO;
3526         if (likely(bitmap[0] & FATTR4_WORD0_FILEHANDLE)) {
3527                 p = xdr_inline_decode(xdr, 4);
3528                 if (unlikely(!p))
3529                         goto out_overflow;
3530                 len = be32_to_cpup(p);
3531                 if (len > NFS4_FHSIZE)
3532                         return -EIO;
3533                 p = xdr_inline_decode(xdr, len);
3534                 if (unlikely(!p))
3535                         goto out_overflow;
3536                 if (fh != NULL) {
3537                         memcpy(fh->data, p, len);
3538                         fh->size = len;
3539                 }
3540                 bitmap[0] &= ~FATTR4_WORD0_FILEHANDLE;
3541         }
3542         return 0;
3543 out_overflow:
3544         print_overflow_msg(__func__, xdr);
3545         return -EIO;
3546 }
3547 
3548 static int decode_attr_aclsupport(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3549 {
3550         __be32 *p;
3551 
3552         *res = 0;
3553         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACLSUPPORT - 1U)))
3554                 return -EIO;
3555         if (likely(bitmap[0] & FATTR4_WORD0_ACLSUPPORT)) {
3556                 p = xdr_inline_decode(xdr, 4);
3557                 if (unlikely(!p))
3558                         goto out_overflow;
3559                 *res = be32_to_cpup(p);
3560                 bitmap[0] &= ~FATTR4_WORD0_ACLSUPPORT;
3561         }
3562         dprintk("%s: ACLs supported=%u\n", __func__, (unsigned int)*res);
3563         return 0;
3564 out_overflow:
3565         print_overflow_msg(__func__, xdr);
3566         return -EIO;
3567 }
3568 
3569 static int decode_attr_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3570 {
3571         __be32 *p;
3572         int ret = 0;
3573 
3574         *fileid = 0;
3575         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILEID - 1U)))
3576                 return -EIO;
3577         if (likely(bitmap[0] & FATTR4_WORD0_FILEID)) {
3578                 p = xdr_inline_decode(xdr, 8);
3579                 if (unlikely(!p))
3580                         goto out_overflow;
3581                 xdr_decode_hyper(p, fileid);
3582                 bitmap[0] &= ~FATTR4_WORD0_FILEID;
3583                 ret = NFS_ATTR_FATTR_FILEID;
3584         }
3585         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3586         return ret;
3587 out_overflow:
3588         print_overflow_msg(__func__, xdr);
3589         return -EIO;
3590 }
3591 
3592 static int decode_attr_mounted_on_fileid(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *fileid)
3593 {
3594         __be32 *p;
3595         int ret = 0;
3596 
3597         *fileid = 0;
3598         if (unlikely(bitmap[1] & (FATTR4_WORD1_MOUNTED_ON_FILEID - 1U)))
3599                 return -EIO;
3600         if (likely(bitmap[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)) {
3601                 p = xdr_inline_decode(xdr, 8);
3602                 if (unlikely(!p))
3603                         goto out_overflow;
3604                 xdr_decode_hyper(p, fileid);
3605                 bitmap[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
3606                 ret = NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
3607         }
3608         dprintk("%s: fileid=%Lu\n", __func__, (unsigned long long)*fileid);
3609         return ret;
3610 out_overflow:
3611         print_overflow_msg(__func__, xdr);
3612         return -EIO;
3613 }
3614 
3615 static int decode_attr_files_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3616 {
3617         __be32 *p;
3618         int status = 0;
3619 
3620         *res = 0;
3621         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_AVAIL - 1U)))
3622                 return -EIO;
3623         if (likely(bitmap[0] & FATTR4_WORD0_FILES_AVAIL)) {
3624                 p = xdr_inline_decode(xdr, 8);
3625                 if (unlikely(!p))
3626                         goto out_overflow;
3627                 xdr_decode_hyper(p, res);
3628                 bitmap[0] &= ~FATTR4_WORD0_FILES_AVAIL;
3629         }
3630         dprintk("%s: files avail=%Lu\n", __func__, (unsigned long long)*res);
3631         return status;
3632 out_overflow:
3633         print_overflow_msg(__func__, xdr);
3634         return -EIO;
3635 }
3636 
3637 static int decode_attr_files_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3638 {
3639         __be32 *p;
3640         int status = 0;
3641 
3642         *res = 0;
3643         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_FREE - 1U)))
3644                 return -EIO;
3645         if (likely(bitmap[0] & FATTR4_WORD0_FILES_FREE)) {
3646                 p = xdr_inline_decode(xdr, 8);
3647                 if (unlikely(!p))
3648                         goto out_overflow;
3649                 xdr_decode_hyper(p, res);
3650                 bitmap[0] &= ~FATTR4_WORD0_FILES_FREE;
3651         }
3652         dprintk("%s: files free=%Lu\n", __func__, (unsigned long long)*res);
3653         return status;
3654 out_overflow:
3655         print_overflow_msg(__func__, xdr);
3656         return -EIO;
3657 }
3658 
3659 static int decode_attr_files_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3660 {
3661         __be32 *p;
3662         int status = 0;
3663 
3664         *res = 0;
3665         if (unlikely(bitmap[0] & (FATTR4_WORD0_FILES_TOTAL - 1U)))
3666                 return -EIO;
3667         if (likely(bitmap[0] & FATTR4_WORD0_FILES_TOTAL)) {
3668                 p = xdr_inline_decode(xdr, 8);
3669                 if (unlikely(!p))
3670                         goto out_overflow;
3671                 xdr_decode_hyper(p, res);
3672                 bitmap[0] &= ~FATTR4_WORD0_FILES_TOTAL;
3673         }
3674         dprintk("%s: files total=%Lu\n", __func__, (unsigned long long)*res);
3675         return status;
3676 out_overflow:
3677         print_overflow_msg(__func__, xdr);
3678         return -EIO;
3679 }
3680 
3681 static int decode_pathname(struct xdr_stream *xdr, struct nfs4_pathname *path)
3682 {
3683         u32 n;
3684         __be32 *p;
3685         int status = 0;
3686 
3687         p = xdr_inline_decode(xdr, 4);
3688         if (unlikely(!p))
3689                 goto out_overflow;
3690         n = be32_to_cpup(p);
3691         if (n == 0)
3692                 goto root_path;
3693         dprintk("pathname4: ");
3694         if (n > NFS4_PATHNAME_MAXCOMPONENTS) {
3695                 dprintk("cannot parse %d components in path\n", n);
3696                 goto out_eio;
3697         }
3698         for (path->ncomponents = 0; path->ncomponents < n; path->ncomponents++) {
3699                 struct nfs4_string *component = &path->components[path->ncomponents];
3700                 status = decode_opaque_inline(xdr, &component->len, &component->data);
3701                 if (unlikely(status != 0))
3702                         goto out_eio;
3703                 ifdebug (XDR)
3704                         pr_cont("%s%.*s ",
3705                                 (path->ncomponents != n ? "/ " : ""),
3706                                 component->len, component->data);
3707         }
3708 out:
3709         return status;
3710 root_path:
3711 /* a root pathname is sent as a zero component4 */
3712         path->ncomponents = 1;
3713         path->components[0].len=0;
3714         path->components[0].data=NULL;
3715         dprintk("pathname4: /\n");
3716         goto out;
3717 out_eio:
3718         dprintk(" status %d", status);
3719         status = -EIO;
3720         goto out;
3721 out_overflow:
3722         print_overflow_msg(__func__, xdr);
3723         return -EIO;
3724 }
3725 
3726 static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, struct nfs4_fs_locations *res)
3727 {
3728         int n;
3729         __be32 *p;
3730         int status = -EIO;
3731 
3732         if (unlikely(bitmap[0] & (FATTR4_WORD0_FS_LOCATIONS -1U)))
3733                 goto out;
3734         status = 0;
3735         if (unlikely(!(bitmap[0] & FATTR4_WORD0_FS_LOCATIONS)))
3736                 goto out;
3737         bitmap[0] &= ~FATTR4_WORD0_FS_LOCATIONS;
3738         status = -EIO;
3739         /* Ignore borken servers that return unrequested attrs */
3740         if (unlikely(res == NULL))
3741                 goto out;
3742         dprintk("%s: fsroot:\n", __func__);
3743         status = decode_pathname(xdr, &res->fs_path);
3744         if (unlikely(status != 0))
3745                 goto out;
3746         p = xdr_inline_decode(xdr, 4);
3747         if (unlikely(!p))
3748                 goto out_overflow;
3749         n = be32_to_cpup(p);
3750         if (n <= 0)
3751                 goto out_eio;
3752         for (res->nlocations = 0; res->nlocations < n; res->nlocations++) {
3753                 u32 m;
3754                 struct nfs4_fs_location *loc;
3755 
3756                 if (res->nlocations == NFS4_FS_LOCATIONS_MAXENTRIES)
3757                         break;
3758                 loc = &res->locations[res->nlocations];
3759                 p = xdr_inline_decode(xdr, 4);
3760                 if (unlikely(!p))
3761                         goto out_overflow;
3762                 m = be32_to_cpup(p);
3763 
3764                 dprintk("%s: servers:\n", __func__);
3765                 for (loc->nservers = 0; loc->nservers < m; loc->nservers++) {
3766                         struct nfs4_string *server;
3767 
3768                         if (loc->nservers == NFS4_FS_LOCATION_MAXSERVERS) {
3769                                 unsigned int i;
3770                                 dprintk("%s: using first %u of %u servers "
3771                                         "returned for location %u\n",
3772                                                 __func__,
3773                                                 NFS4_FS_LOCATION_MAXSERVERS,
3774                                                 m, res->nlocations);
3775                                 for (i = loc->nservers; i < m; i++) {
3776                                         unsigned int len;
3777                                         char *data;
3778                                         status = decode_opaque_inline(xdr, &len, &data);
3779                                         if (unlikely(status != 0))
3780                                                 goto out_eio;
3781                                 }
3782                                 break;
3783                         }
3784                         server = &loc->servers[loc->nservers];
3785                         status = decode_opaque_inline(xdr, &server->len, &server->data);
3786                         if (unlikely(status != 0))
3787                                 goto out_eio;
3788                         dprintk("%s ", server->data);
3789                 }
3790                 status = decode_pathname(xdr, &loc->rootpath);
3791                 if (unlikely(status != 0))
3792                         goto out_eio;
3793         }
3794         if (res->nlocations != 0)
3795                 status = NFS_ATTR_FATTR_V4_LOCATIONS;
3796 out:
3797         dprintk("%s: fs_locations done, error = %d\n", __func__, status);
3798         return status;
3799 out_overflow:
3800         print_overflow_msg(__func__, xdr);
3801 out_eio:
3802         status = -EIO;
3803         goto out;
3804 }
3805 
3806 static int decode_attr_maxfilesize(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
3807 {
3808         __be32 *p;
3809         int status = 0;
3810 
3811         *res = 0;
3812         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXFILESIZE - 1U)))
3813                 return -EIO;
3814         if (likely(bitmap[0] & FATTR4_WORD0_MAXFILESIZE)) {
3815                 p = xdr_inline_decode(xdr, 8);
3816                 if (unlikely(!p))
3817                         goto out_overflow;
3818                 xdr_decode_hyper(p, res);
3819                 bitmap[0] &= ~FATTR4_WORD0_MAXFILESIZE;
3820         }
3821         dprintk("%s: maxfilesize=%Lu\n", __func__, (unsigned long long)*res);
3822         return status;
3823 out_overflow:
3824         print_overflow_msg(__func__, xdr);
3825         return -EIO;
3826 }
3827 
3828 static int decode_attr_maxlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxlink)
3829 {
3830         __be32 *p;
3831         int status = 0;
3832 
3833         *maxlink = 1;
3834         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXLINK - 1U)))
3835                 return -EIO;
3836         if (likely(bitmap[0] & FATTR4_WORD0_MAXLINK)) {
3837                 p = xdr_inline_decode(xdr, 4);
3838                 if (unlikely(!p))
3839                         goto out_overflow;
3840                 *maxlink = be32_to_cpup(p);
3841                 bitmap[0] &= ~FATTR4_WORD0_MAXLINK;
3842         }
3843         dprintk("%s: maxlink=%u\n", __func__, *maxlink);
3844         return status;
3845 out_overflow:
3846         print_overflow_msg(__func__, xdr);
3847         return -EIO;
3848 }
3849 
3850 static int decode_attr_maxname(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *maxname)
3851 {
3852         __be32 *p;
3853         int status = 0;
3854 
3855         *maxname = 1024;
3856         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXNAME - 1U)))
3857                 return -EIO;
3858         if (likely(bitmap[0] & FATTR4_WORD0_MAXNAME)) {
3859                 p = xdr_inline_decode(xdr, 4);
3860                 if (unlikely(!p))
3861                         goto out_overflow;
3862                 *maxname = be32_to_cpup(p);
3863                 bitmap[0] &= ~FATTR4_WORD0_MAXNAME;
3864         }
3865         dprintk("%s: maxname=%u\n", __func__, *maxname);
3866         return status;
3867 out_overflow:
3868         print_overflow_msg(__func__, xdr);
3869         return -EIO;
3870 }
3871 
3872 static int decode_attr_maxread(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3873 {
3874         __be32 *p;
3875         int status = 0;
3876 
3877         *res = 1024;
3878         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXREAD - 1U)))
3879                 return -EIO;
3880         if (likely(bitmap[0] & FATTR4_WORD0_MAXREAD)) {
3881                 uint64_t maxread;
3882                 p = xdr_inline_decode(xdr, 8);
3883                 if (unlikely(!p))
3884                         goto out_overflow;
3885                 xdr_decode_hyper(p, &maxread);
3886                 if (maxread > 0x7FFFFFFF)
3887                         maxread = 0x7FFFFFFF;
3888                 *res = (uint32_t)maxread;
3889                 bitmap[0] &= ~FATTR4_WORD0_MAXREAD;
3890         }
3891         dprintk("%s: maxread=%lu\n", __func__, (unsigned long)*res);
3892         return status;
3893 out_overflow:
3894         print_overflow_msg(__func__, xdr);
3895         return -EIO;
3896 }
3897 
3898 static int decode_attr_maxwrite(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *res)
3899 {
3900         __be32 *p;
3901         int status = 0;
3902 
3903         *res = 1024;
3904         if (unlikely(bitmap[0] & (FATTR4_WORD0_MAXWRITE - 1U)))
3905                 return -EIO;
3906         if (likely(bitmap[0] & FATTR4_WORD0_MAXWRITE)) {
3907                 uint64_t maxwrite;
3908                 p = xdr_inline_decode(xdr, 8);
3909                 if (unlikely(!p))
3910                         goto out_overflow;
3911                 xdr_decode_hyper(p, &maxwrite);
3912                 if (maxwrite > 0x7FFFFFFF)
3913                         maxwrite = 0x7FFFFFFF;
3914                 *res = (uint32_t)maxwrite;
3915                 bitmap[0] &= ~FATTR4_WORD0_MAXWRITE;
3916         }
3917         dprintk("%s: maxwrite=%lu\n", __func__, (unsigned long)*res);
3918         return status;
3919 out_overflow:
3920         print_overflow_msg(__func__, xdr);
3921         return -EIO;
3922 }
3923 
3924 static int decode_attr_mode(struct xdr_stream *xdr, uint32_t *bitmap, umode_t *mode)
3925 {
3926         uint32_t tmp;
3927         __be32 *p;
3928         int ret = 0;
3929 
3930         *mode = 0;
3931         if (unlikely(bitmap[1] & (FATTR4_WORD1_MODE - 1U)))
3932                 return -EIO;
3933         if (likely(bitmap[1] & FATTR4_WORD1_MODE)) {
3934                 p = xdr_inline_decode(xdr, 4);
3935                 if (unlikely(!p))
3936                         goto out_overflow;
3937                 tmp = be32_to_cpup(p);
3938                 *mode = tmp & ~S_IFMT;
3939                 bitmap[1] &= ~FATTR4_WORD1_MODE;
3940                 ret = NFS_ATTR_FATTR_MODE;
3941         }
3942         dprintk("%s: file mode=0%o\n", __func__, (unsigned int)*mode);
3943         return ret;
3944 out_overflow:
3945         print_overflow_msg(__func__, xdr);
3946         return -EIO;
3947 }
3948 
3949 static int decode_attr_nlink(struct xdr_stream *xdr, uint32_t *bitmap, uint32_t *nlink)
3950 {
3951         __be32 *p;
3952         int ret = 0;
3953 
3954         *nlink = 1;
3955         if (unlikely(bitmap[1] & (FATTR4_WORD1_NUMLINKS - 1U)))
3956                 return -EIO;
3957         if (likely(bitmap[1] & FATTR4_WORD1_NUMLINKS)) {
3958                 p = xdr_inline_decode(xdr, 4);
3959                 if (unlikely(!p))
3960                         goto out_overflow;
3961                 *nlink = be32_to_cpup(p);
3962                 bitmap[1] &= ~FATTR4_WORD1_NUMLINKS;
3963                 ret = NFS_ATTR_FATTR_NLINK;
3964         }
3965         dprintk("%s: nlink=%u\n", __func__, (unsigned int)*nlink);
3966         return ret;
3967 out_overflow:
3968         print_overflow_msg(__func__, xdr);
3969         return -EIO;
3970 }
3971 
3972 static ssize_t decode_nfs4_string(struct xdr_stream *xdr,
3973                 struct nfs4_string *name, gfp_t gfp_flags)
3974 {
3975         ssize_t ret;
3976 
3977         ret = xdr_stream_decode_string_dup(xdr, &name->data,
3978                         XDR_MAX_NETOBJ, gfp_flags);
3979         name->len = 0;
3980         if (ret > 0)
3981                 name->len = ret;
3982         return ret;
3983 }
3984 
3985 static int decode_attr_owner(struct xdr_stream *xdr, uint32_t *bitmap,
3986                 const struct nfs_server *server, kuid_t *uid,
3987                 struct nfs4_string *owner_name)
3988 {
3989         ssize_t len;
3990         char *p;
3991 
3992         *uid = make_kuid(&init_user_ns, -2);
3993         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER - 1U)))
3994                 return -EIO;
3995         if (!(bitmap[1] & FATTR4_WORD1_OWNER))
3996                 return 0;
3997         bitmap[1] &= ~FATTR4_WORD1_OWNER;
3998 
3999         if (owner_name != NULL) {
4000                 len = decode_nfs4_string(xdr, owner_name, GFP_NOIO);
4001                 if (len <= 0)
4002                         goto out;
4003                 dprintk("%s: name=%s\n", __func__, owner_name->data);
4004                 return NFS_ATTR_FATTR_OWNER_NAME;
4005         } else {
4006                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
4007                                 XDR_MAX_NETOBJ);
4008                 if (len <= 0 || nfs_map_name_to_uid(server, p, len, uid) != 0)
4009                         goto out;
4010                 dprintk("%s: uid=%d\n", __func__, (int)from_kuid(&init_user_ns, *uid));
4011                 return NFS_ATTR_FATTR_OWNER;
4012         }
4013 out:
4014         if (len != -EBADMSG)
4015                 return 0;
4016         print_overflow_msg(__func__, xdr);
4017         return -EIO;
4018 }
4019 
4020 static int decode_attr_group(struct xdr_stream *xdr, uint32_t *bitmap,
4021                 const struct nfs_server *server, kgid_t *gid,
4022                 struct nfs4_string *group_name)
4023 {
4024         ssize_t len;
4025         char *p;
4026 
4027         *gid = make_kgid(&init_user_ns, -2);
4028         if (unlikely(bitmap[1] & (FATTR4_WORD1_OWNER_GROUP - 1U)))
4029                 return -EIO;
4030         if (!(bitmap[1] & FATTR4_WORD1_OWNER_GROUP))
4031                 return 0;
4032         bitmap[1] &= ~FATTR4_WORD1_OWNER_GROUP;
4033 
4034         if (group_name != NULL) {
4035                 len = decode_nfs4_string(xdr, group_name, GFP_NOIO);
4036                 if (len <= 0)
4037                         goto out;
4038                 dprintk("%s: name=%s\n", __func__, group_name->data);
4039                 return NFS_ATTR_FATTR_GROUP_NAME;
4040         } else {
4041                 len = xdr_stream_decode_opaque_inline(xdr, (void **)&p,
4042                                 XDR_MAX_NETOBJ);
4043                 if (len <= 0 || nfs_map_group_to_gid(server, p, len, gid) != 0)
4044                         goto out;
4045                 dprintk("%s: gid=%d\n", __func__, (int)from_kgid(&init_user_ns, *gid));
4046                 return NFS_ATTR_FATTR_GROUP;
4047         }
4048 out:
4049         if (len != -EBADMSG)
4050                 return 0;
4051         print_overflow_msg(__func__, xdr);
4052         return -EIO;
4053 }
4054 
4055 static int decode_attr_rdev(struct xdr_stream *xdr, uint32_t *bitmap, dev_t *rdev)
4056 {
4057         uint32_t major = 0, minor = 0;
4058         __be32 *p;
4059         int ret = 0;
4060 
4061         *rdev = MKDEV(0,0);
4062         if (unlikely(bitmap[1] & (FATTR4_WORD1_RAWDEV - 1U)))
4063                 return -EIO;
4064         if (likely(bitmap[1] & FATTR4_WORD1_RAWDEV)) {
4065                 dev_t tmp;
4066 
4067                 p = xdr_inline_decode(xdr, 8);
4068                 if (unlikely(!p))
4069                         goto out_overflow;
4070                 major = be32_to_cpup(p++);
4071                 minor = be32_to_cpup(p);
4072                 tmp = MKDEV(major, minor);
4073                 if (MAJOR(tmp) == major && MINOR(tmp) == minor)
4074                         *rdev = tmp;
4075                 bitmap[1] &= ~ FATTR4_WORD1_RAWDEV;
4076                 ret = NFS_ATTR_FATTR_RDEV;
4077         }
4078         dprintk("%s: rdev=(0x%x:0x%x)\n", __func__, major, minor);
4079         return ret;
4080 out_overflow:
4081         print_overflow_msg(__func__, xdr);
4082         return -EIO;
4083 }
4084 
4085 static int decode_attr_space_avail(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4086 {
4087         __be32 *p;
4088         int status = 0;
4089 
4090         *res = 0;
4091         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_AVAIL - 1U)))
4092                 return -EIO;
4093         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_AVAIL)) {
4094                 p = xdr_inline_decode(xdr, 8);
4095                 if (unlikely(!p))
4096                         goto out_overflow;
4097                 xdr_decode_hyper(p, res);
4098                 bitmap[1] &= ~FATTR4_WORD1_SPACE_AVAIL;
4099         }
4100         dprintk("%s: space avail=%Lu\n", __func__, (unsigned long long)*res);
4101         return status;
4102 out_overflow:
4103         print_overflow_msg(__func__, xdr);
4104         return -EIO;
4105 }
4106 
4107 static int decode_attr_space_free(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4108 {
4109         __be32 *p;
4110         int status = 0;
4111 
4112         *res = 0;
4113         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_FREE - 1U)))
4114                 return -EIO;
4115         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_FREE)) {
4116                 p = xdr_inline_decode(xdr, 8);
4117                 if (unlikely(!p))
4118                         goto out_overflow;
4119                 xdr_decode_hyper(p, res);
4120                 bitmap[1] &= ~FATTR4_WORD1_SPACE_FREE;
4121         }
4122         dprintk("%s: space free=%Lu\n", __func__, (unsigned long long)*res);
4123         return status;
4124 out_overflow:
4125         print_overflow_msg(__func__, xdr);
4126         return -EIO;
4127 }
4128 
4129 static int decode_attr_space_total(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *res)
4130 {
4131         __be32 *p;
4132         int status = 0;
4133 
4134         *res = 0;
4135         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_TOTAL - 1U)))
4136                 return -EIO;
4137         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_TOTAL)) {
4138                 p = xdr_inline_decode(xdr, 8);
4139                 if (unlikely(!p))
4140                         goto out_overflow;
4141                 xdr_decode_hyper(p, res);
4142                 bitmap[1] &= ~FATTR4_WORD1_SPACE_TOTAL;
4143         }
4144         dprintk("%s: space total=%Lu\n", __func__, (unsigned long long)*res);
4145         return status;
4146 out_overflow:
4147         print_overflow_msg(__func__, xdr);
4148         return -EIO;
4149 }
4150 
4151 static int decode_attr_space_used(struct xdr_stream *xdr, uint32_t *bitmap, uint64_t *used)
4152 {
4153         __be32 *p;
4154         int ret = 0;
4155 
4156         *used = 0;
4157         if (unlikely(bitmap[1] & (FATTR4_WORD1_SPACE_USED - 1U)))
4158                 return -EIO;
4159         if (likely(bitmap[1] & FATTR4_WORD1_SPACE_USED)) {
4160                 p = xdr_inline_decode(xdr, 8);
4161                 if (unlikely(!p))
4162                         goto out_overflow;
4163                 xdr_decode_hyper(p, used);
4164                 bitmap[1] &= ~FATTR4_WORD1_SPACE_USED;
4165                 ret = NFS_ATTR_FATTR_SPACE_USED;
4166         }
4167         dprintk("%s: space used=%Lu\n", __func__,
4168                         (unsigned long long)*used);
4169         return ret;
4170 out_overflow:
4171         print_overflow_msg(__func__, xdr);
4172         return -EIO;
4173 }
4174 
4175 static __be32 *
4176 xdr_decode_nfstime4(__be32 *p, struct timespec *t)
4177 {
4178         __u64 sec;
4179 
4180         p = xdr_decode_hyper(p, &sec);
4181         t-> tv_sec = (time_t)sec;
4182         t->tv_nsec = be32_to_cpup(p++);
4183         return p;
4184 }
4185 
4186 static int decode_attr_time(struct xdr_stream *xdr, struct timespec *time)
4187 {
4188         __be32 *p;
4189 
4190         p = xdr_inline_decode(xdr, nfstime4_maxsz << 2);
4191         if (unlikely(!p))
4192                 goto out_overflow;
4193         xdr_decode_nfstime4(p, time);
4194         return 0;
4195 out_overflow:
4196         print_overflow_msg(__func__, xdr);
4197         return -EIO;
4198 }
4199 
4200 static int decode_attr_time_access(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4201 {
4202         int status = 0;
4203 
4204         time->tv_sec = 0;
4205         time->tv_nsec = 0;
4206         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_ACCESS - 1U)))
4207                 return -EIO;
4208         if (likely(bitmap[1] & FATTR4_WORD1_TIME_ACCESS)) {
4209                 status = decode_attr_time(xdr, time);
4210                 if (status == 0)
4211                         status = NFS_ATTR_FATTR_ATIME;
4212                 bitmap[1] &= ~FATTR4_WORD1_TIME_ACCESS;
4213         }
4214         dprintk("%s: atime=%ld\n", __func__, (long)time->tv_sec);
4215         return status;
4216 }
4217 
4218 static int decode_attr_time_metadata(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4219 {
4220         int status = 0;
4221 
4222         time->tv_sec = 0;
4223         time->tv_nsec = 0;
4224         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_METADATA - 1U)))
4225                 return -EIO;
4226         if (likely(bitmap[1] & FATTR4_WORD1_TIME_METADATA)) {
4227                 status = decode_attr_time(xdr, time);
4228                 if (status == 0)
4229                         status = NFS_ATTR_FATTR_CTIME;
4230                 bitmap[1] &= ~FATTR4_WORD1_TIME_METADATA;
4231         }
4232         dprintk("%s: ctime=%ld\n", __func__, (long)time->tv_sec);
4233         return status;
4234 }
4235 
4236 static int decode_attr_time_delta(struct xdr_stream *xdr, uint32_t *bitmap,
4237                                   struct timespec *time)
4238 {
4239         int status = 0;
4240 
4241         time->tv_sec = 0;
4242         time->tv_nsec = 0;
4243         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_DELTA - 1U)))
4244                 return -EIO;
4245         if (likely(bitmap[1] & FATTR4_WORD1_TIME_DELTA)) {
4246                 status = decode_attr_time(xdr, time);
4247                 bitmap[1] &= ~FATTR4_WORD1_TIME_DELTA;
4248         }
4249         dprintk("%s: time_delta=%ld %ld\n", __func__, (long)time->tv_sec,
4250                 (long)time->tv_nsec);
4251         return status;
4252 }
4253 
4254 static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
4255                                         struct nfs4_label *label)
4256 {
4257         uint32_t pi = 0;
4258         uint32_t lfs = 0;
4259         __u32 len;
4260         __be32 *p;
4261         int status = 0;
4262 
4263         if (unlikely(bitmap[2] & (FATTR4_WORD2_SECURITY_LABEL - 1U)))
4264                 return -EIO;
4265         if (likely(bitmap[2] & FATTR4_WORD2_SECURITY_LABEL)) {
4266                 p = xdr_inline_decode(xdr, 4);
4267                 if (unlikely(!p))
4268                         goto out_overflow;
4269                 lfs = be32_to_cpup(p++);
4270                 p = xdr_inline_decode(xdr, 4);
4271                 if (unlikely(!p))
4272                         goto out_overflow;
4273                 pi = be32_to_cpup(p++);
4274                 p = xdr_inline_decode(xdr, 4);
4275                 if (unlikely(!p))
4276                         goto out_overflow;
4277                 len = be32_to_cpup(p++);
4278                 p = xdr_inline_decode(xdr, len);
4279                 if (unlikely(!p))
4280                         goto out_overflow;
4281                 if (len < NFS4_MAXLABELLEN) {
4282                         if (label) {
4283                                 memcpy(label->label, p, len);
4284                                 label->len = len;
4285                                 label->pi = pi;
4286                                 label->lfs = lfs;
4287                                 status = NFS_ATTR_FATTR_V4_SECURITY_LABEL;
4288                         }
4289                         bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
4290                 } else
4291                         printk(KERN_WARNING "%s: label too long (%u)!\n",
4292                                         __func__, len);
4293         }
4294         if (label && label->label)
4295                 dprintk("%s: label=%s, len=%d, PI=%d, LFS=%d\n", __func__,
4296                         (char *)label->label, label->len, label->pi, label->lfs);
4297         return status;
4298 
4299 out_overflow:
4300         print_overflow_msg(__func__, xdr);
4301         return -EIO;
4302 }
4303 
4304 static int decode_attr_time_modify(struct xdr_stream *xdr, uint32_t *bitmap, struct timespec *time)
4305 {
4306         int status = 0;
4307 
4308         time->tv_sec = 0;
4309         time->tv_nsec = 0;
4310         if (unlikely(bitmap[1] & (FATTR4_WORD1_TIME_MODIFY - 1U)))
4311                 return -EIO;
4312         if (likely(bitmap[1] & FATTR4_WORD1_TIME_MODIFY)) {
4313                 status = decode_attr_time(xdr, time);
4314                 if (status == 0)
4315                         status = NFS_ATTR_FATTR_MTIME;
4316                 bitmap[1] &= ~FATTR4_WORD1_TIME_MODIFY;
4317         }
4318         dprintk("%s: mtime=%ld\n", __func__, (long)time->tv_sec);
4319         return status;
4320 }
4321 
4322 static int verify_attr_len(struct xdr_stream *xdr, unsigned int savep, uint32_t attrlen)
4323 {
4324         unsigned int attrwords = XDR_QUADLEN(attrlen);
4325         unsigned int nwords = (xdr_stream_pos(xdr) - savep) >> 2;
4326 
4327         if (unlikely(attrwords != nwords)) {
4328                 dprintk("%s: server returned incorrect attribute length: "
4329                         "%u %c %u\n",
4330                                 __func__,
4331                                 attrwords << 2,
4332                                 (attrwords < nwords) ? '<' : '>',
4333                                 nwords << 2);
4334                 return -EIO;
4335         }
4336         return 0;
4337 }
4338 
4339 static int decode_change_info(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4340 {
4341         __be32 *p;
4342 
4343         p = xdr_inline_decode(xdr, 20);
4344         if (unlikely(!p))
4345                 goto out_overflow;
4346         cinfo->atomic = be32_to_cpup(p++);
4347         p = xdr_decode_hyper(p, &cinfo->before);
4348         xdr_decode_hyper(p, &cinfo->after);
4349         return 0;
4350 out_overflow:
4351         print_overflow_msg(__func__, xdr);
4352         return -EIO;
4353 }
4354 
4355 static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
4356 {
4357         __be32 *p;
4358         uint32_t supp, acc;
4359         int status;
4360 
4361         status = decode_op_hdr(xdr, OP_ACCESS);
4362         if (status)
4363                 return status;
4364         p = xdr_inline_decode(xdr, 8);
4365         if (unlikely(!p))
4366                 goto out_overflow;
4367         supp = be32_to_cpup(p++);
4368         acc = be32_to_cpup(p);
4369         *supported = supp;
4370         *access = acc;
4371         return 0;
4372 out_overflow:
4373         print_overflow_msg(__func__, xdr);
4374         return -EIO;
4375 }
4376 
4377 static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
4378 {
4379         ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
4380         if (unlikely(ret < 0)) {
4381                 print_overflow_msg(__func__, xdr);
4382                 return -EIO;
4383         }
4384         return 0;
4385 }
4386 
4387 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4388 {
4389         return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
4390 }
4391 
4392 static int decode_open_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4393 {
4394         stateid->type = NFS4_OPEN_STATEID_TYPE;
4395         return decode_stateid(xdr, stateid);
4396 }
4397 
4398 static int decode_lock_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4399 {
4400         stateid->type = NFS4_LOCK_STATEID_TYPE;
4401         return decode_stateid(xdr, stateid);
4402 }
4403 
4404 static int decode_delegation_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4405 {
4406         stateid->type = NFS4_DELEGATION_STATEID_TYPE;
4407         return decode_stateid(xdr, stateid);
4408 }
4409 
4410 static int decode_invalid_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
4411 {
4412         nfs4_stateid dummy;
4413 
4414         nfs4_stateid_copy(stateid, &invalid_stateid);
4415         return decode_stateid(xdr, &dummy);
4416 }
4417 
4418 static int decode_close(struct xdr_stream *xdr, struct nfs_closeres *res)
4419 {
4420         int status;
4421 
4422         status = decode_op_hdr(xdr, OP_CLOSE);
4423         if (status != -EIO)
4424                 nfs_increment_open_seqid(status, res->seqid);
4425         if (!status)
4426                 status = decode_invalid_stateid(xdr, &res->stateid);
4427         return status;
4428 }
4429 
4430 static int decode_verifier(struct xdr_stream *xdr, void *verifier)
4431 {
4432         return decode_opaque_fixed(xdr, verifier, NFS4_VERIFIER_SIZE);
4433 }
4434 
4435 static int decode_write_verifier(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
4436 {
4437         return decode_opaque_fixed(xdr, verifier->data, NFS4_VERIFIER_SIZE);
4438 }
4439 
4440 static int decode_commit(struct xdr_stream *xdr, struct nfs_commitres *res)
4441 {
4442         int status;
4443 
4444         status = decode_op_hdr(xdr, OP_COMMIT);
4445         if (!status)
4446                 status = decode_write_verifier(xdr, &res->verf->verifier);
4447         return status;
4448 }
4449 
4450 static int decode_create(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
4451 {
4452         __be32 *p;
4453         uint32_t bmlen;
4454         int status;
4455 
4456         status = decode_op_hdr(xdr, OP_CREATE);
4457         if (status)
4458                 return status;
4459         if ((status = decode_change_info(xdr, cinfo)))
4460                 return status;
4461         p = xdr_inline_decode(xdr, 4);
4462         if (unlikely(!p))
4463                 goto out_overflow;
4464         bmlen = be32_to_cpup(p);
4465         p = xdr_inline_decode(xdr, bmlen << 2);
4466         if (likely(p))
4467                 return 0;
4468 out_overflow:
4469         print_overflow_msg(__func__, xdr);
4470         return -EIO;
4471 }
4472 
4473 static int decode_server_caps(struct xdr_stream *xdr, struct nfs4_server_caps_res *res)
4474 {
4475         unsigned int savep;
4476         uint32_t attrlen, bitmap[3] = {0};
4477         int status;
4478 
4479         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4480                 goto xdr_error;
4481         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4482                 goto xdr_error;
4483         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4484                 goto xdr_error;
4485         if ((status = decode_attr_supported(xdr, bitmap, res->attr_bitmask)) != 0)
4486                 goto xdr_error;
4487         if ((status = decode_attr_fh_expire_type(xdr, bitmap,
4488                                                  &res->fh_expire_type)) != 0)
4489                 goto xdr_error;
4490         if ((status = decode_attr_link_support(xdr, bitmap, &res->has_links)) != 0)
4491                 goto xdr_error;
4492         if ((status = decode_attr_symlink_support(xdr, bitmap, &res->has_symlinks)) != 0)
4493                 goto xdr_error;
4494         if ((status = decode_attr_aclsupport(xdr, bitmap, &res->acl_bitmask)) != 0)
4495                 goto xdr_error;
4496         if ((status = decode_attr_exclcreat_supported(xdr, bitmap,
4497                                 res->exclcreat_bitmask)) != 0)
4498                 goto xdr_error;
4499         status = verify_attr_len(xdr, savep, attrlen);
4500 xdr_error:
4501         dprintk("%s: xdr returned %d!\n", __func__, -status);
4502         return status;
4503 }
4504 
4505 static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
4506 {
4507         unsigned int savep;
4508         uint32_t attrlen, bitmap[3] = {0};
4509         int status;
4510 
4511         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4512                 goto xdr_error;
4513         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4514                 goto xdr_error;
4515         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4516                 goto xdr_error;
4517 
4518         if ((status = decode_attr_files_avail(xdr, bitmap, &fsstat->afiles)) != 0)
4519                 goto xdr_error;
4520         if ((status = decode_attr_files_free(xdr, bitmap, &fsstat->ffiles)) != 0)
4521                 goto xdr_error;
4522         if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
4523                 goto xdr_error;
4524 
4525         status = -EIO;
4526         if (unlikely(bitmap[0]))
4527                 goto xdr_error;
4528 
4529         if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
4530                 goto xdr_error;
4531         if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
4532                 goto xdr_error;
4533         if ((status = decode_attr_space_total(xdr, bitmap, &fsstat->tbytes)) != 0)
4534                 goto xdr_error;
4535 
4536         status = verify_attr_len(xdr, savep, attrlen);
4537 xdr_error:
4538         dprintk("%s: xdr returned %d!\n", __func__, -status);
4539         return status;
4540 }
4541 
4542 static int decode_pathconf(struct xdr_stream *xdr, struct nfs_pathconf *pathconf)
4543 {
4544         unsigned int savep;
4545         uint32_t attrlen, bitmap[3] = {0};
4546         int status;
4547 
4548         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4549                 goto xdr_error;
4550         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4551                 goto xdr_error;
4552         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4553                 goto xdr_error;
4554 
4555         if ((status = decode_attr_maxlink(xdr, bitmap, &pathconf->max_link)) != 0)
4556                 goto xdr_error;
4557         if ((status = decode_attr_maxname(xdr, bitmap, &pathconf->max_namelen)) != 0)
4558                 goto xdr_error;
4559 
4560         status = verify_attr_len(xdr, savep, attrlen);
4561 xdr_error:
4562         dprintk("%s: xdr returned %d!\n", __func__, -status);
4563         return status;
4564 }
4565 
4566 static int decode_threshold_hint(struct xdr_stream *xdr,
4567                                   uint32_t *bitmap,
4568                                   uint64_t *res,
4569                                   uint32_t hint_bit)
4570 {
4571         __be32 *p;
4572 
4573         *res = 0;
4574         if (likely(bitmap[0] & hint_bit)) {
4575                 p = xdr_inline_decode(xdr, 8);
4576                 if (unlikely(!p))
4577                         goto out_overflow;
4578                 xdr_decode_hyper(p, res);
4579         }
4580         return 0;
4581 out_overflow:
4582         print_overflow_msg(__func__, xdr);
4583         return -EIO;
4584 }
4585 
4586 static int decode_first_threshold_item4(struct xdr_stream *xdr,
4587                                         struct nfs4_threshold *res)
4588 {
4589         __be32 *p;
4590         unsigned int savep;
4591         uint32_t bitmap[3] = {0,}, attrlen;
4592         int status;
4593 
4594         /* layout type */
4595         p = xdr_inline_decode(xdr, 4);
4596         if (unlikely(!p)) {
4597                 print_overflow_msg(__func__, xdr);
4598                 return -EIO;
4599         }
4600         res->l_type = be32_to_cpup(p);
4601 
4602         /* thi_hintset bitmap */
4603         status = decode_attr_bitmap(xdr, bitmap);
4604         if (status < 0)
4605                 goto xdr_error;
4606 
4607         /* thi_hintlist length */
4608         status = decode_attr_length(xdr, &attrlen, &savep);
4609         if (status < 0)
4610                 goto xdr_error;
4611         /* thi_hintlist */
4612         status = decode_threshold_hint(xdr, bitmap, &res->rd_sz, THRESHOLD_RD);
4613         if (status < 0)
4614                 goto xdr_error;
4615         status = decode_threshold_hint(xdr, bitmap, &res->wr_sz, THRESHOLD_WR);
4616         if (status < 0)
4617                 goto xdr_error;
4618         status = decode_threshold_hint(xdr, bitmap, &res->rd_io_sz,
4619                                        THRESHOLD_RD_IO);
4620         if (status < 0)
4621                 goto xdr_error;
4622         status = decode_threshold_hint(xdr, bitmap, &res->wr_io_sz,
4623                                        THRESHOLD_WR_IO);
4624         if (status < 0)
4625                 goto xdr_error;
4626 
4627         status = verify_attr_len(xdr, savep, attrlen);
4628         res->bm = bitmap[0];
4629 
4630         dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n",
4631                  __func__, res->bm, res->rd_sz, res->wr_sz, res->rd_io_sz,
4632                 res->wr_io_sz);
4633 xdr_error:
4634         dprintk("%s ret=%d!\n", __func__, status);
4635         return status;
4636 }
4637 
4638 /*
4639  * Thresholds on pNFS direct I/O vrs MDS I/O
4640  */
4641 static int decode_attr_mdsthreshold(struct xdr_stream *xdr,
4642                                     uint32_t *bitmap,
4643                                     struct nfs4_threshold *res)
4644 {
4645         __be32 *p;
4646         int status = 0;
4647         uint32_t num;
4648 
4649         if (unlikely(bitmap[2] & (FATTR4_WORD2_MDSTHRESHOLD - 1U)))
4650                 return -EIO;
4651         if (bitmap[2] & FATTR4_WORD2_MDSTHRESHOLD) {
4652                 /* Did the server return an unrequested attribute? */
4653                 if (unlikely(res == NULL))
4654                         return -EREMOTEIO;
4655                 p = xdr_inline_decode(xdr, 4);
4656                 if (unlikely(!p))
4657                         goto out_overflow;
4658                 num = be32_to_cpup(p);
4659                 if (num == 0)
4660                         return 0;
4661                 if (num > 1)
4662                         printk(KERN_INFO "%s: Warning: Multiple pNFS layout "
4663                                 "drivers per filesystem not supported\n",
4664                                 __func__);
4665 
4666                 status = decode_first_threshold_item4(xdr, res);
4667                 bitmap[2] &= ~FATTR4_WORD2_MDSTHRESHOLD;
4668         }
4669         return status;
4670 out_overflow:
4671         print_overflow_msg(__func__, xdr);
4672         return -EIO;
4673 }
4674 
4675 static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
4676                 struct nfs_fattr *fattr, struct nfs_fh *fh,
4677                 struct nfs4_fs_locations *fs_loc, struct nfs4_label *label,
4678                 const struct nfs_server *server)
4679 {
4680         int status;
4681         umode_t fmode = 0;
4682         uint32_t type;
4683         int32_t err;
4684 
4685         status = decode_attr_type(xdr, bitmap, &type);
4686         if (status < 0)
4687                 goto xdr_error;
4688         fattr->mode = 0;
4689         if (status != 0) {
4690                 fattr->mode |= nfs_type2fmt[type];
4691                 fattr->valid |= status;
4692         }
4693 
4694         status = decode_attr_change(xdr, bitmap, &fattr->change_attr);
4695         if (status < 0)
4696                 goto xdr_error;
4697         fattr->valid |= status;
4698 
4699         status = decode_attr_size(xdr, bitmap, &fattr->size);
4700         if (status < 0)
4701                 goto xdr_error;
4702         fattr->valid |= status;
4703 
4704         status = decode_attr_fsid(xdr, bitmap, &fattr->fsid);
4705         if (status < 0)
4706                 goto xdr_error;
4707         fattr->valid |= status;
4708 
4709         err = 0;
4710         status = decode_attr_error(xdr, bitmap, &err);
4711         if (status < 0)
4712                 goto xdr_error;
4713 
4714         status = decode_attr_filehandle(xdr, bitmap, fh);
4715         if (status < 0)
4716                 goto xdr_error;
4717 
4718         status = decode_attr_fileid(xdr, bitmap, &fattr->fileid);
4719         if (status < 0)
4720                 goto xdr_error;
4721         fattr->valid |= status;
4722 
4723         status = decode_attr_fs_locations(xdr, bitmap, fs_loc);
4724         if (status < 0)
4725                 goto xdr_error;
4726         fattr->valid |= status;
4727 
4728         status = -EIO;
4729         if (unlikely(bitmap[0]))
4730                 goto xdr_error;
4731 
4732         status = decode_attr_mode(xdr, bitmap, &fmode);
4733         if (status < 0)
4734                 goto xdr_error;
4735         if (status != 0) {
4736                 fattr->mode |= fmode;
4737                 fattr->valid |= status;
4738         }
4739 
4740         status = decode_attr_nlink(xdr, bitmap, &fattr->nlink);
4741         if (status < 0)
4742                 goto xdr_error;
4743         fattr->valid |= status;
4744 
4745         status = decode_attr_owner(xdr, bitmap, server, &fattr->uid, fattr->owner_name);
4746         if (status < 0)
4747                 goto xdr_error;
4748         fattr->valid |= status;
4749 
4750         status = decode_attr_group(xdr, bitmap, server, &fattr->gid, fattr->group_name);
4751         if (status < 0)
4752                 goto xdr_error;
4753         fattr->valid |= status;
4754 
4755         status = decode_attr_rdev(xdr, bitmap, &fattr->rdev);
4756         if (status < 0)
4757                 goto xdr_error;
4758         fattr->valid |= status;
4759 
4760         status = decode_attr_space_used(xdr, bitmap, &fattr->du.nfs3.used);
4761         if (status < 0)
4762                 goto xdr_error;
4763         fattr->valid |= status;
4764 
4765         status = decode_attr_time_access(xdr, bitmap, &fattr->atime);
4766         if (status < 0)
4767                 goto xdr_error;
4768         fattr->valid |= status;
4769 
4770         status = decode_attr_time_metadata(xdr, bitmap, &fattr->ctime);
4771         if (status < 0)
4772                 goto xdr_error;
4773         fattr->valid |= status;
4774 
4775         status = decode_attr_time_modify(xdr, bitmap, &fattr->mtime);
4776         if (status < 0)
4777                 goto xdr_error;
4778         fattr->valid |= status;
4779 
4780         status = decode_attr_mounted_on_fileid(xdr, bitmap, &fattr->mounted_on_fileid);
4781         if (status < 0)
4782                 goto xdr_error;
4783         fattr->valid |= status;
4784 
4785         status = -EIO;
4786         if (unlikely(bitmap[1]))
4787                 goto xdr_error;
4788 
4789         status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
4790         if (status < 0)
4791                 goto xdr_error;
4792 
4793         if (label) {
4794                 status = decode_attr_security_label(xdr, bitmap, label);
4795                 if (status < 0)
4796                         goto xdr_error;
4797                 fattr->valid |= status;
4798         }
4799 
4800 xdr_error:
4801         dprintk("%s: xdr returned %d\n", __func__, -status);
4802         return status;
4803 }
4804 
4805 static int decode_getfattr_generic(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4806                 struct nfs_fh *fh, struct nfs4_fs_locations *fs_loc,
4807                 struct nfs4_label *label, const struct nfs_server *server)
4808 {
4809         unsigned int savep;
4810         uint32_t attrlen,
4811                  bitmap[3] = {0};
4812         int status;
4813 
4814         status = decode_op_hdr(xdr, OP_GETATTR);
4815         if (status < 0)
4816                 goto xdr_error;
4817 
4818         status = decode_attr_bitmap(xdr, bitmap);
4819         if (status < 0)
4820                 goto xdr_error;
4821 
4822         status = decode_attr_length(xdr, &attrlen, &savep);
4823         if (status < 0)
4824                 goto xdr_error;
4825 
4826         status = decode_getfattr_attrs(xdr, bitmap, fattr, fh, fs_loc,
4827                                         label, server);
4828         if (status < 0)
4829                 goto xdr_error;
4830 
4831         status = verify_attr_len(xdr, savep, attrlen);
4832 xdr_error:
4833         dprintk("%s: xdr returned %d\n", __func__, -status);
4834         return status;
4835 }
4836 
4837 static int decode_getfattr_label(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4838                 struct nfs4_label *label, const struct nfs_server *server)
4839 {
4840         return decode_getfattr_generic(xdr, fattr, NULL, NULL, label, server);
4841 }
4842 
4843 static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
4844                 const struct nfs_server *server)
4845 {
4846         return decode_getfattr_generic(xdr, fattr, NULL, NULL, NULL, server);
4847 }
4848 
4849 /*
4850  * Decode potentially multiple layout types.
4851  */
4852 static int decode_pnfs_layout_types(struct xdr_stream *xdr,
4853                                     struct nfs_fsinfo *fsinfo)
4854 {
4855         __be32 *p;
4856         uint32_t i;
4857 
4858         p = xdr_inline_decode(xdr, 4);
4859         if (unlikely(!p))
4860                 goto out_overflow;
4861         fsinfo->nlayouttypes = be32_to_cpup(p);
4862 
4863         /* pNFS is not supported by the underlying file system */
4864         if (fsinfo->nlayouttypes == 0)
4865                 return 0;
4866 
4867         /* Decode and set first layout type, move xdr->p past unused types */
4868         p = xdr_inline_decode(xdr, fsinfo->nlayouttypes * 4);
4869         if (unlikely(!p))
4870                 goto out_overflow;
4871 
4872         /* If we get too many, then just cap it at the max */
4873         if (fsinfo->nlayouttypes > NFS_MAX_LAYOUT_TYPES) {
4874                 printk(KERN_INFO "NFS: %s: Warning: Too many (%u) pNFS layout types\n",
4875                         __func__, fsinfo->nlayouttypes);
4876                 fsinfo->nlayouttypes = NFS_MAX_LAYOUT_TYPES;
4877         }
4878 
4879         for(i = 0; i < fsinfo->nlayouttypes; ++i)
4880                 fsinfo->layouttype[i] = be32_to_cpup(p++);
4881         return 0;
4882 out_overflow:
4883         print_overflow_msg(__func__, xdr);
4884         return -EIO;
4885 }
4886 
4887 /*
4888  * The type of file system exported.
4889  * Note we must ensure that layouttype is set in any non-error case.
4890  */
4891 static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap,
4892                                 struct nfs_fsinfo *fsinfo)
4893 {
4894         int status = 0;
4895 
4896         dprintk("%s: bitmap is %x\n", __func__, bitmap[1]);
4897         if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U)))
4898                 return -EIO;
4899         if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) {
4900                 status = decode_pnfs_layout_types(xdr, fsinfo);
4901                 bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES;
4902         }
4903         return status;
4904 }
4905 
4906 /*
4907  * The prefered block size for layout directed io
4908  */
4909 static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4910                                       uint32_t *res)
4911 {
4912         __be32 *p;
4913 
4914         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4915         *res = 0;
4916         if (bitmap[2] & FATTR4_WORD2_LAYOUT_BLKSIZE) {
4917                 p = xdr_inline_decode(xdr, 4);
4918                 if (unlikely(!p)) {
4919                         print_overflow_msg(__func__, xdr);
4920                         return -EIO;
4921                 }
4922                 *res = be32_to_cpup(p);
4923                 bitmap[2] &= ~FATTR4_WORD2_LAYOUT_BLKSIZE;
4924         }
4925         return 0;
4926 }
4927 
4928 /*
4929  * The granularity of a CLONE operation.
4930  */
4931 static int decode_attr_clone_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
4932                                      uint32_t *res)
4933 {
4934         __be32 *p;
4935 
4936         dprintk("%s: bitmap is %x\n", __func__, bitmap[2]);
4937         *res = 0;
4938         if (bitmap[2] & FATTR4_WORD2_CLONE_BLKSIZE) {
4939                 p = xdr_inline_decode(xdr, 4);
4940                 if (unlikely(!p)) {
4941                         print_overflow_msg(__func__, xdr);
4942                         return -EIO;
4943                 }
4944                 *res = be32_to_cpup(p);
4945                 bitmap[2] &= ~FATTR4_WORD2_CLONE_BLKSIZE;
4946         }
4947         return 0;
4948 }
4949 
4950 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
4951 {
4952         unsigned int savep;
4953         uint32_t attrlen, bitmap[3];
4954         int status;
4955 
4956         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
4957                 goto xdr_error;
4958         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
4959                 goto xdr_error;
4960         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
4961                 goto xdr_error;
4962 
4963         fsinfo->rtmult = fsinfo->wtmult = 512;  /* ??? */
4964 
4965         if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
4966                 goto xdr_error;
4967         if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
4968                 goto xdr_error;
4969         if ((status = decode_attr_maxread(xdr, bitmap, &fsinfo->rtmax)) != 0)
4970                 goto xdr_error;
4971         fsinfo->rtpref = fsinfo->dtpref = fsinfo->rtmax;
4972         if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
4973                 goto xdr_error;
4974         fsinfo->wtpref = fsinfo->wtmax;
4975 
4976         status = -EIO;
4977         if (unlikely(bitmap[0]))
4978                 goto xdr_error;
4979 
4980         status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
4981         if (status != 0)
4982                 goto xdr_error;
4983         status = decode_attr_pnfstype(xdr, bitmap, fsinfo);
4984         if (status != 0)
4985                 goto xdr_error;
4986 
4987         status = -EIO;
4988         if (unlikely(bitmap[1]))
4989                 goto xdr_error;
4990 
4991         status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
4992         if (status)
4993                 goto xdr_error;
4994         status = decode_attr_clone_blksize(xdr, bitmap, &fsinfo->clone_blksize);
4995         if (status)
4996                 goto xdr_error;
4997 
4998         status = verify_attr_len(xdr, savep, attrlen);
4999 xdr_error:
5000         dprintk("%s: xdr returned %d!\n", __func__, -status);
5001         return status;
5002 }
5003 
5004 static int decode_getfh(struct xdr_stream *xdr, struct nfs_fh *fh)
5005 {
5006         __be32 *p;
5007         uint32_t len;
5008         int status;
5009 
5010         /* Zero handle first to allow comparisons */
5011         memset(fh, 0, sizeof(*fh));
5012 
5013         status = decode_op_hdr(xdr, OP_GETFH);
5014         if (status)
5015                 return status;
5016 
5017         p = xdr_inline_decode(xdr, 4);
5018         if (unlikely(!p))
5019                 goto out_overflow;
5020         len = be32_to_cpup(p);
5021         if (len > NFS4_FHSIZE)
5022                 return -EIO;
5023         fh->size = len;
5024         p = xdr_inline_decode(xdr, len);
5025         if (unlikely(!p))
5026                 goto out_overflow;
5027         memcpy(fh->data, p, len);
5028         return 0;
5029 out_overflow:
5030         print_overflow_msg(__func__, xdr);
5031         return -EIO;
5032 }
5033 
5034 static int decode_link(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5035 {
5036         int status;
5037 
5038         status = decode_op_hdr(xdr, OP_LINK);
5039         if (status)
5040                 return status;
5041         return decode_change_info(xdr, cinfo);
5042 }
5043 
5044 /*
5045  * We create the owner, so we know a proper owner.id length is 4.
5046  */
5047 static int decode_lock_denied (struct xdr_stream *xdr, struct file_lock *fl)
5048 {
5049         uint64_t offset, length, clientid;
5050         __be32 *p;
5051         uint32_t namelen, type;
5052 
5053         p = xdr_inline_decode(xdr, 32); /* read 32 bytes */
5054         if (unlikely(!p))
5055                 goto out_overflow;
5056         p = xdr_decode_hyper(p, &offset); /* read 2 8-byte long words */
5057         p = xdr_decode_hyper(p, &length);
5058         type = be32_to_cpup(p++); /* 4 byte read */
5059         if (fl != NULL) { /* manipulate file lock */
5060                 fl->fl_start = (loff_t)offset;
5061                 fl->fl_end = fl->fl_start + (loff_t)length - 1;
5062                 if (length == ~(uint64_t)0)
5063                         fl->fl_end = OFFSET_MAX;
5064                 fl->fl_type = F_WRLCK;
5065                 if (type & 1)
5066                         fl->fl_type = F_RDLCK;
5067                 fl->fl_pid = 0;
5068         }
5069         p = xdr_decode_hyper(p, &clientid); /* read 8 bytes */
5070         namelen = be32_to_cpup(p); /* read 4 bytes */  /* have read all 32 bytes now */
5071         p = xdr_inline_decode(xdr, namelen); /* variable size field */
5072         if (likely(p))
5073                 return -NFS4ERR_DENIED;
5074 out_overflow:
5075         print_overflow_msg(__func__, xdr);
5076         return -EIO;
5077 }
5078 
5079 static int decode_lock(struct xdr_stream *xdr, struct nfs_lock_res *res)
5080 {
5081         int status;
5082 
5083         status = decode_op_hdr(xdr, OP_LOCK);
5084         if (status == -EIO)
5085                 goto out;
5086         if (status == 0) {
5087                 status = decode_lock_stateid(xdr, &res->stateid);
5088                 if (unlikely(status))
5089                         goto out;
5090         } else if (status == -NFS4ERR_DENIED)
5091                 status = decode_lock_denied(xdr, NULL);
5092         if (res->open_seqid != NULL)
5093                 nfs_increment_open_seqid(status, res->open_seqid);
5094         nfs_increment_lock_seqid(status, res->lock_seqid);
5095 out:
5096         return status;
5097 }
5098 
5099 static int decode_lockt(struct xdr_stream *xdr, struct nfs_lockt_res *res)
5100 {
5101         int status;
5102         status = decode_op_hdr(xdr, OP_LOCKT);
5103         if (status == -NFS4ERR_DENIED)
5104                 return decode_lock_denied(xdr, res->denied);
5105         return status;
5106 }
5107 
5108 static int decode_locku(struct xdr_stream *xdr, struct nfs_locku_res *res)
5109 {
5110         int status;
5111 
5112         status = decode_op_hdr(xdr, OP_LOCKU);
5113         if (status != -EIO)
5114                 nfs_increment_lock_seqid(status, res->seqid);
5115         if (status == 0)
5116                 status = decode_lock_stateid(xdr, &res->stateid);
5117         return status;
5118 }
5119 
5120 static int decode_release_lockowner(struct xdr_stream *xdr)
5121 {
5122         return decode_op_hdr(xdr, OP_RELEASE_LOCKOWNER);
5123 }
5124 
5125 static int decode_lookup(struct xdr_stream *xdr)
5126 {
5127         return decode_op_hdr(xdr, OP_LOOKUP);
5128 }
5129 
5130 static int decode_lookupp(struct xdr_stream *xdr)
5131 {
5132         return decode_op_hdr(xdr, OP_LOOKUPP);
5133 }
5134 
5135 /* This is too sick! */
5136 static int decode_space_limit(struct xdr_stream *xdr,
5137                 unsigned long *pagemod_limit)
5138 {
5139         __be32 *p;
5140         uint32_t limit_type, nblocks, blocksize;
5141         u64 maxsize = 0;
5142 
5143         p = xdr_inline_decode(xdr, 12);
5144         if (unlikely(!p))
5145                 goto out_overflow;
5146         limit_type = be32_to_cpup(p++);
5147         switch (limit_type) {
5148         case NFS4_LIMIT_SIZE:
5149                 xdr_decode_hyper(p, &maxsize);
5150                 break;
5151         case NFS4_LIMIT_BLOCKS:
5152                 nblocks = be32_to_cpup(p++);
5153                 blocksize = be32_to_cpup(p);
5154                 maxsize = (uint64_t)nblocks * (uint64_t)blocksize;
5155         }
5156         maxsize >>= PAGE_SHIFT;
5157         *pagemod_limit = min_t(u64, maxsize, ULONG_MAX);
5158         return 0;
5159 out_overflow:
5160         print_overflow_msg(__func__, xdr);
5161         return -EIO;
5162 }
5163 
5164 static int decode_rw_delegation(struct xdr_stream *xdr,
5165                 uint32_t delegation_type,
5166                 struct nfs_openres *res)
5167 {
5168         __be32 *p;
5169         int status;
5170 
5171         status = decode_delegation_stateid(xdr, &res->delegation);
5172         if (unlikely(status))
5173                 return status;
5174         p = xdr_inline_decode(xdr, 4);
5175         if (unlikely(!p))
5176                 goto out_overflow;
5177         res->do_recall = be32_to_cpup(p);
5178 
5179         switch (delegation_type) {
5180         case NFS4_OPEN_DELEGATE_READ:
5181                 res->delegation_type = FMODE_READ;
5182                 break;
5183         case NFS4_OPEN_DELEGATE_WRITE:
5184                 res->delegation_type = FMODE_WRITE|FMODE_READ;
5185                 if (decode_space_limit(xdr, &res->pagemod_limit) < 0)
5186                                 return -EIO;
5187         }
5188         return decode_ace(xdr, NULL);
5189 out_overflow:
5190         print_overflow_msg(__func__, xdr);
5191         return -EIO;
5192 }
5193 
5194 static int decode_no_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5195 {
5196         __be32 *p;
5197         uint32_t why_no_delegation;
5198 
5199         p = xdr_inline_decode(xdr, 4);
5200         if (unlikely(!p))
5201                 goto out_overflow;
5202         why_no_delegation = be32_to_cpup(p);
5203         switch (why_no_delegation) {
5204                 case WND4_CONTENTION:
5205                 case WND4_RESOURCE:
5206                         xdr_inline_decode(xdr, 4);
5207                         /* Ignore for now */
5208         }
5209         return 0;
5210 out_overflow:
5211         print_overflow_msg(__func__, xdr);
5212         return -EIO;
5213 }
5214 
5215 static int decode_delegation(struct xdr_stream *xdr, struct nfs_openres *res)
5216 {
5217         __be32 *p;
5218         uint32_t delegation_type;
5219 
5220         p = xdr_inline_decode(xdr, 4);
5221         if (unlikely(!p))
5222                 goto out_overflow;
5223         delegation_type = be32_to_cpup(p);
5224         res->delegation_type = 0;
5225         switch (delegation_type) {
5226         case NFS4_OPEN_DELEGATE_NONE:
5227                 return 0;
5228         case NFS4_OPEN_DELEGATE_READ:
5229         case NFS4_OPEN_DELEGATE_WRITE:
5230                 return decode_rw_delegation(xdr, delegation_type, res);
5231         case NFS4_OPEN_DELEGATE_NONE_EXT:
5232                 return decode_no_delegation(xdr, res);
5233         }
5234         return -EIO;
5235 out_overflow:
5236         print_overflow_msg(__func__, xdr);
5237         return -EIO;
5238 }
5239 
5240 static int decode_open(struct xdr_stream *xdr, struct nfs_openres *res)
5241 {
5242         __be32 *p;
5243         uint32_t savewords, bmlen, i;
5244         int status;
5245 
5246         if (!__decode_op_hdr(xdr, OP_OPEN, &status))
5247                 return status;
5248         nfs_increment_open_seqid(status, res->seqid);
5249         if (status)
5250                 return status;
5251         status = decode_open_stateid(xdr, &res->stateid);
5252         if (unlikely(status))
5253                 return status;
5254 
5255         decode_change_info(xdr, &res->cinfo);
5256 
5257         p = xdr_inline_decode(xdr, 8);
5258         if (unlikely(!p))
5259                 goto out_overflow;
5260         res->rflags = be32_to_cpup(p++);
5261         bmlen = be32_to_cpup(p);
5262         if (bmlen > 10)
5263                 goto xdr_error;
5264 
5265         p = xdr_inline_decode(xdr, bmlen << 2);
5266         if (unlikely(!p))
5267                 goto out_overflow;
5268         savewords = min_t(uint32_t, bmlen, NFS4_BITMAP_SIZE);
5269         for (i = 0; i < savewords; ++i)
5270                 res->attrset[i] = be32_to_cpup(p++);
5271         for (; i < NFS4_BITMAP_SIZE; i++)
5272                 res->attrset[i] = 0;
5273 
5274         return decode_delegation(xdr, res);
5275 xdr_error:
5276         dprintk("%s: Bitmap too large! Length = %u\n", __func__, bmlen);
5277         return -EIO;
5278 out_overflow:
5279         print_overflow_msg(__func__, xdr);
5280         return -EIO;
5281 }
5282 
5283 static int decode_open_confirm(struct xdr_stream *xdr, struct nfs_open_confirmres *res)
5284 {
5285         int status;
5286 
5287         status = decode_op_hdr(xdr, OP_OPEN_CONFIRM);
5288         if (status != -EIO)
5289                 nfs_increment_open_seqid(status, res->seqid);
5290         if (!status)
5291                 status = decode_open_stateid(xdr, &res->stateid);
5292         return status;
5293 }
5294 
5295 static int decode_open_downgrade(struct xdr_stream *xdr, struct nfs_closeres *res)
5296 {
5297         int status;
5298 
5299         status = decode_op_hdr(xdr, OP_OPEN_DOWNGRADE);
5300         if (status != -EIO)
5301                 nfs_increment_open_seqid(status, res->seqid);
5302         if (!status)
5303                 status = decode_open_stateid(xdr, &res->stateid);
5304         return status;
5305 }
5306 
5307 static int decode_putfh(struct xdr_stream *xdr)
5308 {
5309         return decode_op_hdr(xdr, OP_PUTFH);
5310 }
5311 
5312 static int decode_putrootfh(struct xdr_stream *xdr)
5313 {
5314         return decode_op_hdr(xdr, OP_PUTROOTFH);
5315 }
5316 
5317 static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req,
5318                        struct nfs_pgio_res *res)
5319 {
5320         __be32 *p;
5321         uint32_t count, eof, recvd;
5322         int status;
5323 
5324         status = decode_op_hdr(xdr, OP_READ);
5325         if (status)
5326                 return status;
5327         p = xdr_inline_decode(xdr, 8);
5328         if (unlikely(!p))
5329                 goto out_overflow;
5330         eof = be32_to_cpup(p++);
5331         count = be32_to_cpup(p);
5332         recvd = xdr_read_pages(xdr, count);
5333         if (count > recvd) {
5334                 dprintk("NFS: server cheating in read reply: "
5335                                 "count %u > recvd %u\n", count, recvd);
5336                 count = recvd;
5337                 eof = 0;
5338         }
5339         res->eof = eof;
5340         res->count = count;
5341         return 0;
5342 out_overflow:
5343         print_overflow_msg(__func__, xdr);
5344         return -EIO;
5345 }
5346 
5347 static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
5348 {
5349         int             status;
5350         __be32          verf[2];
5351 
5352         status = decode_op_hdr(xdr, OP_READDIR);
5353         if (!status)
5354                 status = decode_verifier(xdr, readdir->verifier.data);
5355         if (unlikely(status))
5356                 return status;
5357         memcpy(verf, readdir->verifier.data, sizeof(verf));
5358         dprintk("%s: verifier = %08x:%08x\n",
5359                         __func__, verf[0], verf[1]);
5360         return xdr_read_pages(xdr, xdr->buf->page_len);
5361 }
5362 
5363 static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
5364 {
5365         struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
5366         u32 len, recvd;
5367         __be32 *p;
5368         int status;
5369 
5370         status = decode_op_hdr(xdr, OP_READLINK);
5371         if (status)
5372                 return status;
5373 
5374         /* Convert length of symlink */
5375         p = xdr_inline_decode(xdr, 4);
5376         if (unlikely(!p))
5377                 goto out_overflow;
5378         len = be32_to_cpup(p);
5379         if (len >= rcvbuf->page_len || len <= 0) {
5380                 dprintk("nfs: server returned giant symlink!\n");
5381                 return -ENAMETOOLONG;
5382         }
5383         recvd = xdr_read_pages(xdr, len);
5384         if (recvd < len) {
5385                 dprintk("NFS: server cheating in readlink reply: "
5386                                 "count %u > recvd %u\n", len, recvd);
5387                 return -EIO;
5388         }
5389         /*
5390          * The XDR encode routine has set things up so that
5391          * the link text will be copied directly into the
5392          * buffer.  We just have to do overflow-checking,
5393          * and and null-terminate the text (the VFS expects
5394          * null-termination).
5395          */
5396         xdr_terminate_string(rcvbuf, len);
5397         return 0;
5398 out_overflow:
5399         print_overflow_msg(__func__, xdr);
5400         return -EIO;
5401 }
5402 
5403 static int decode_remove(struct xdr_stream *xdr, struct nfs4_change_info *cinfo)
5404 {
5405         int status;
5406 
5407         status = decode_op_hdr(xdr, OP_REMOVE);
5408         if (status)
5409                 goto out;
5410         status = decode_change_info(xdr, cinfo);
5411 out:
5412         return status;
5413 }
5414 
5415 static int decode_rename(struct xdr_stream *xdr, struct nfs4_change_info *old_cinfo,
5416               struct nfs4_change_info *new_cinfo)
5417 {
5418         int status;
5419 
5420         status = decode_op_hdr(xdr, OP_RENAME);
5421         if (status)
5422                 goto out;
5423         if ((status = decode_change_info(xdr, old_cinfo)))
5424                 goto out;
5425         status = decode_change_info(xdr, new_cinfo);
5426 out:
5427         return status;
5428 }
5429 
5430 static int decode_renew(struct xdr_stream *xdr)
5431 {
5432         return decode_op_hdr(xdr, OP_RENEW);
5433 }
5434 
5435 static int
5436 decode_restorefh(struct xdr_stream *xdr)
5437 {
5438         return decode_op_hdr(xdr, OP_RESTOREFH);
5439 }
5440 
5441 static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
5442                          struct nfs_getaclres *res)
5443 {
5444         unsigned int savep;
5445         uint32_t attrlen,
5446                  bitmap[3] = {0};
5447         int status;
5448         unsigned int pg_offset;
5449 
5450         res->acl_len = 0;
5451         if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
5452                 goto out;
5453 
5454         xdr_enter_page(xdr, xdr->buf->page_len);
5455 
5456         /* Calculate the offset of the page data */
5457         pg_offset = xdr->buf->head[0].iov_len;
5458 
5459         if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
5460                 goto out;
5461         if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
5462                 goto out;
5463 
5464         if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
5465                 return -EIO;
5466         if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
5467 
5468                 /* The bitmap (xdr len + bitmaps) and the attr xdr len words
5469                  * are stored with the acl data to handle the problem of
5470                  * variable length bitmaps.*/
5471                 res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
5472                 res->acl_len = attrlen;
5473 
5474                 /* Check for receive buffer overflow */
5475                 if (res->acl_len > (xdr->nwords << 2) ||
5476                     res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
5477                         res->acl_flags |= NFS4_ACL_TRUNC;
5478                         dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
5479                                         attrlen, xdr->nwords << 2);
5480                 }
5481         } else
5482                 status = -EOPNOTSUPP;
5483 
5484 out:
5485         return status;
5486 }
5487 
5488 static int
5489 decode_savefh(struct xdr_stream *xdr)
5490 {
5491         return decode_op_hdr(xdr, OP_SAVEFH);
5492 }
5493 
5494 static int decode_setattr(struct xdr_stream *xdr)
5495 {
5496         int status;
5497 
5498         status = decode_op_hdr(xdr, OP_SETATTR);
5499         if (status)
5500                 return status;
5501         if (decode_bitmap4(xdr, NULL, 0) >= 0)
5502                 return 0;
5503         print_overflow_msg(__func__, xdr);
5504         return -EIO;
5505 }
5506 
5507 static int decode_setclientid(struct xdr_stream *xdr, struct nfs4_setclientid_res *res)
5508 {
5509         __be32 *p;
5510         uint32_t opnum;
5511         int32_t nfserr;
5512 
5513         p = xdr_inline_decode(xdr, 8);
5514         if (unlikely(!p))
5515                 goto out_overflow;
5516         opnum = be32_to_cpup(p++);
5517         if (opnum != OP_SETCLIENTID) {
5518                 dprintk("nfs: decode_setclientid: Server returned operation"
5519                         " %d\n", opnum);
5520                 return -EIO;
5521         }
5522         nfserr = be32_to_cpup(p);
5523         if (nfserr == NFS_OK) {
5524                 p = xdr_inline_decode(xdr, 8 + NFS4_VERIFIER_SIZE);
5525                 if (unlikely(!p))
5526                         goto out_overflow;
5527                 p = xdr_decode_hyper(p, &res->clientid);
5528                 memcpy(res->confirm.data, p, NFS4_VERIFIER_SIZE);
5529         } else if (nfserr == NFSERR_CLID_INUSE) {
5530                 uint32_t len;
5531 
5532                 /* skip netid string */
5533                 p = xdr_inline_decode(xdr, 4);
5534                 if (unlikely(!p))
5535                         goto out_overflow;
5536                 len = be32_to_cpup(p);
5537                 p = xdr_inline_decode(xdr, len);
5538                 if (unlikely(!p))
5539                         goto out_overflow;
5540 
5541                 /* skip uaddr string */
5542                 p = xdr_inline_decode(xdr, 4);
5543                 if (unlikely(!p))
5544                         goto out_overflow;
5545                 len = be32_to_cpup(p);
5546                 p = xdr_inline_decode(xdr, len);
5547                 if (unlikely(!p))
5548                         goto out_overflow;
5549                 return -NFSERR_CLID_INUSE;
5550         } else
5551                 return nfs4_stat_to_errno(nfserr);
5552 
5553         return 0;
5554 out_overflow:
5555         print_overflow_msg(__func__, xdr);
5556         return -EIO;
5557 }
5558 
5559 static int decode_setclientid_confirm(struct xdr_stream *xdr)
5560 {
5561         return decode_op_hdr(xdr, OP_SETCLIENTID_CONFIRM);
5562 }
5563 
5564 static int decode_write(struct xdr_stream *xdr, struct nfs_pgio_res *res)
5565 {
5566         __be32 *p;
5567         int status;
5568 
5569         status = decode_op_hdr(xdr, OP_WRITE);
5570         if (status)
5571                 return status;
5572 
5573         p = xdr_inline_decode(xdr, 8);
5574         if (unlikely(!p))
5575                 goto out_overflow;
5576         res->count = be32_to_cpup(p++);
5577         res->verf->committed = be32_to_cpup(p++);
5578         return decode_write_verifier(xdr, &res->verf->verifier);
5579 out_overflow:
5580         print_overflow_msg(__func__, xdr);
5581         return -EIO;
5582 }
5583 
5584 static int decode_delegreturn(struct xdr_stream *xdr)
5585 {
5586         return decode_op_hdr(xdr, OP_DELEGRETURN);
5587 }
5588 
5589 static int decode_secinfo_gss(struct xdr_stream *xdr,
5590                               struct nfs4_secinfo4 *flavor)
5591 {
5592         u32 oid_len;
5593         __be32 *p;
5594 
5595         p = xdr_inline_decode(xdr, 4);
5596         if (unlikely(!p))
5597                 goto out_overflow;
5598         oid_len = be32_to_cpup(p);
5599         if (oid_len > GSS_OID_MAX_LEN)
5600                 goto out_err;
5601 
5602         p = xdr_inline_decode(xdr, oid_len);
5603         if (unlikely(!p))
5604                 goto out_overflow;
5605         memcpy(flavor->flavor_info.oid.data, p, oid_len);
5606         flavor->flavor_info.oid.len = oid_len;
5607 
5608         p = xdr_inline_decode(xdr, 8);
5609         if (unlikely(!p))
5610                 goto out_overflow;
5611         flavor->flavor_info.qop = be32_to_cpup(p++);
5612         flavor->flavor_info.service = be32_to_cpup(p);
5613 
5614         return 0;
5615 
5616 out_overflow:
5617         print_overflow_msg(__func__, xdr);
5618         return -EIO;
5619 out_err:
5620         return -EINVAL;
5621 }
5622 
5623 static int decode_secinfo_common(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5624 {
5625         struct nfs4_secinfo4 *sec_flavor;
5626         unsigned int i, num_flavors;
5627         int status;
5628         __be32 *p;
5629 
5630         p = xdr_inline_decode(xdr, 4);
5631         if (unlikely(!p))
5632                 goto out_overflow;
5633 
5634         res->flavors->num_flavors = 0;
5635         num_flavors = be32_to_cpup(p);
5636 
5637         for (i = 0; i < num_flavors; i++) {
5638                 sec_flavor = &res->flavors->flavors[i];
5639                 if ((char *)&sec_flavor[1] - (char *)res->flavors > PAGE_SIZE)
5640                         break;
5641 
5642                 p = xdr_inline_decode(xdr, 4);
5643                 if (unlikely(!p))
5644                         goto out_overflow;
5645                 sec_flavor->flavor = be32_to_cpup(p);
5646 
5647                 if (sec_flavor->flavor == RPC_AUTH_GSS) {
5648                         status = decode_secinfo_gss(xdr, sec_flavor);
5649                         if (status)
5650                                 goto out;
5651                 }
5652                 res->flavors->num_flavors++;
5653         }
5654 
5655         status = 0;
5656 out:
5657         return status;
5658 out_overflow:
5659         print_overflow_msg(__func__, xdr);
5660         return -EIO;
5661 }
5662 
5663 static int decode_secinfo(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5664 {
5665         int status = decode_op_hdr(xdr, OP_SECINFO);
5666         if (status)
5667                 return status;
5668         return decode_secinfo_common(xdr, res);
5669 }
5670 
5671 #if defined(CONFIG_NFS_V4_1)
5672 static int decode_secinfo_no_name(struct xdr_stream *xdr, struct nfs4_secinfo_res *res)
5673 {
5674         int status = decode_op_hdr(xdr, OP_SECINFO_NO_NAME);
5675         if (status)
5676                 return status;
5677         return decode_secinfo_common(xdr, res);
5678 }
5679 
5680 static int decode_op_map(struct xdr_stream *xdr, struct nfs4_op_map *op_map)
5681 {
5682         __be32 *p;
5683         uint32_t bitmap_words;
5684         unsigned int i;
5685 
5686         p = xdr_inline_decode(xdr, 4);
5687         if (!p)
5688                 return -EIO;
5689         bitmap_words = be32_to_cpup(p++);
5690         if (bitmap_words > NFS4_OP_MAP_NUM_WORDS)
5691                 return -EIO;
5692         p = xdr_inline_decode(xdr, 4 * bitmap_words);
5693         for (i = 0; i < bitmap_words; i++)
5694                 op_map->u.words[i] = be32_to_cpup(p++);
5695 
5696         return 0;
5697 }
5698 
5699 static int decode_exchange_id(struct xdr_stream *xdr,
5700                               struct nfs41_exchange_id_res *res)
5701 {
5702         __be32 *p;
5703         uint32_t dummy;
5704         char *dummy_str;
5705         int status;
5706         uint32_t impl_id_count;
5707 
5708         status = decode_op_hdr(xdr, OP_EXCHANGE_ID);
5709         if (status)
5710                 return status;
5711 
5712         p = xdr_inline_decode(xdr, 8);
5713         if (unlikely(!p))
5714                 goto out_overflow;
5715         xdr_decode_hyper(p, &res->clientid);
5716         p = xdr_inline_decode(xdr, 12);
5717         if (unlikely(!p))
5718                 goto out_overflow;
5719         res->seqid = be32_to_cpup(p++);
5720         res->flags = be32_to_cpup(p++);
5721 
5722         res->state_protect.how = be32_to_cpup(p);
5723         switch (res->state_protect.how) {
5724         case SP4_NONE:
5725                 break;
5726         case SP4_MACH_CRED:
5727                 status = decode_op_map(xdr, &res->state_protect.enforce);
5728                 if (status)
5729                         return status;
5730                 status = decode_op_map(xdr, &res->state_protect.allow);
5731                 if (status)
5732                         return status;
5733                 break;
5734         default:
5735                 WARN_ON_ONCE(1);
5736                 return -EIO;
5737         }
5738 
5739         /* server_owner4.so_minor_id */
5740         p = xdr_inline_decode(xdr, 8);
5741         if (unlikely(!p))
5742                 goto out_overflow;
5743         p = xdr_decode_hyper(p, &res->server_owner->minor_id);
5744 
5745         /* server_owner4.so_major_id */
5746         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5747         if (unlikely(status))
5748                 return status;
5749         memcpy(res->server_owner->major_id, dummy_str, dummy);
5750         res->server_owner->major_id_sz = dummy;
5751 
5752         /* server_scope4 */
5753         status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5754         if (unlikely(status))
5755                 return status;
5756         memcpy(res->server_scope->server_scope, dummy_str, dummy);
5757         res->server_scope->server_scope_sz = dummy;
5758 
5759         /* Implementation Id */
5760         p = xdr_inline_decode(xdr, 4);
5761         if (unlikely(!p))
5762                 goto out_overflow;
5763         impl_id_count = be32_to_cpup(p++);
5764 
5765         if (impl_id_count) {
5766                 /* nii_domain */
5767                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5768                 if (unlikely(status))
5769                         return status;
5770                 memcpy(res->impl_id->domain, dummy_str, dummy);
5771 
5772                 /* nii_name */
5773                 status = decode_opaque_inline(xdr, &dummy, &dummy_str);
5774                 if (unlikely(status))
5775                         return status;
5776                 memcpy(res->impl_id->name, dummy_str, dummy);
5777 
5778                 /* nii_date */
5779                 p = xdr_inline_decode(xdr, 12);
5780                 if (unlikely(!p))
5781                         goto out_overflow;
5782                 p = xdr_decode_hyper(p, &res->impl_id->date.seconds);
5783                 res->impl_id->date.nseconds = be32_to_cpup(p);
5784 
5785                 /* if there's more than one entry, ignore the rest */
5786         }
5787         return 0;
5788 out_overflow:
5789         print_overflow_msg(__func__, xdr);
5790         return -EIO;
5791 }
5792 
5793 static int decode_chan_attrs(struct xdr_stream *xdr,
5794                              struct nfs4_channel_attrs *attrs)
5795 {
5796         __be32 *p;
5797         u32 nr_attrs, val;
5798 
5799         p = xdr_inline_decode(xdr, 28);
5800         if (unlikely(!p))
5801                 goto out_overflow;
5802         val = be32_to_cpup(p++);        /* headerpadsz */
5803         if (val)
5804                 return -EINVAL;         /* no support for header padding yet */
5805         attrs->max_rqst_sz = be32_to_cpup(p++);
5806         attrs->max_resp_sz = be32_to_cpup(p++);
5807         attrs->max_resp_sz_cached = be32_to_cpup(p++);
5808         attrs->max_ops = be32_to_cpup(p++);
5809         attrs->max_reqs = be32_to_cpup(p++);
5810         nr_attrs = be32_to_cpup(p);
5811         if (unlikely(nr_attrs > 1)) {
5812                 printk(KERN_WARNING "NFS: %s: Invalid rdma channel attrs "
5813                         "count %u\n", __func__, nr_attrs);
5814                 return -EINVAL;
5815         }
5816         if (nr_attrs == 1) {
5817                 p = xdr_inline_decode(xdr, 4); /* skip rdma_attrs */
5818                 if (unlikely(!p))
5819                         goto out_overflow;
5820         }
5821         return 0;
5822 out_overflow:
5823         print_overflow_msg(__func__, xdr);
5824         return -EIO;
5825 }
5826 
5827 static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
5828 {
5829         return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
5830 }
5831 
5832 static int decode_bind_conn_to_session(struct xdr_stream *xdr,
5833                                 struct nfs41_bind_conn_to_session_res *res)
5834 {
5835         __be32 *p;
5836         int status;
5837 
5838         status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
5839         if (!status)
5840                 status = decode_sessionid(xdr, &res->sessionid);
5841         if (unlikely(status))
5842                 return status;
5843 
5844         /* dir flags, rdma mode bool */
5845         p = xdr_inline_decode(xdr, 8);
5846         if (unlikely(!p))
5847                 goto out_overflow;
5848 
5849         res->dir = be32_to_cpup(p++);
5850         if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
5851                 return -EIO;
5852         if (be32_to_cpup(p) == 0)
5853                 res->use_conn_in_rdma_mode = false;
5854         else
5855                 res->use_conn_in_rdma_mode = true;
5856 
5857         return 0;
5858 out_overflow:
5859         print_overflow_msg(__func__, xdr);
5860         return -EIO;
5861 }
5862 
5863 static int decode_create_session(struct xdr_stream *xdr,
5864                                  struct nfs41_create_session_res *res)
5865 {
5866         __be32 *p;
5867         int status;
5868 
5869         status = decode_op_hdr(xdr, OP_CREATE_SESSION);
5870         if (!status)
5871                 status = decode_sessionid(xdr, &res->sessionid);
5872         if (unlikely(status))
5873                 return status;
5874 
5875         /* seqid, flags */
5876         p = xdr_inline_decode(xdr, 8);
5877         if (unlikely(!p))
5878                 goto out_overflow;
5879         res->seqid = be32_to_cpup(p++);
5880         res->flags = be32_to_cpup(p);
5881 
5882         /* Channel attributes */
5883         status = decode_chan_attrs(xdr, &res->fc_attrs);
5884         if (!status)
5885                 status = decode_chan_attrs(xdr, &res->bc_attrs);
5886         return status;
5887 out_overflow:
5888         print_overflow_msg(__func__, xdr);
5889         return -EIO;
5890 }
5891 
5892 static int decode_destroy_session(struct xdr_stream *xdr, void *dummy)
5893 {
5894         return decode_op_hdr(xdr, OP_DESTROY_SESSION);
5895 }
5896 
5897 static int decode_destroy_clientid(struct xdr_stream *xdr, void *dummy)
5898 {
5899         return decode_op_hdr(xdr, OP_DESTROY_CLIENTID);
5900 }
5901 
5902 static int decode_reclaim_complete(struct xdr_stream *xdr, void *dummy)
5903 {
5904         return decode_op_hdr(xdr, OP_RECLAIM_COMPLETE);
5905 }
5906 #endif /* CONFIG_NFS_V4_1 */
5907 
5908 static int decode_sequence(struct xdr_stream *xdr,
5909                            struct nfs4_sequence_res *res,
5910                            struct rpc_rqst *rqstp)
5911 {
5912 #if defined(CONFIG_NFS_V4_1)
5913         struct nfs4_session *session;
5914         struct nfs4_sessionid id;
5915         u32 dummy;
5916         int status;
5917         __be32 *p;
5918 
5919         if (res->sr_slot == NULL)
5920                 return 0;
5921         if (!res->sr_slot->table->session)
5922                 return 0;
5923 
5924         status = decode_op_hdr(xdr, OP_SEQUENCE);
5925         if (!status)
5926                 status = decode_sessionid(xdr, &id);
5927         if (unlikely(status))
5928                 goto out_err;
5929 
5930         /*
5931          * If the server returns different values for sessionID, slotID or
5932          * sequence number, the server is looney tunes.
5933          */
5934         status = -EREMOTEIO;
5935         session = res->sr_slot->table->session;
5936 
5937         if (memcmp(id.data, session->sess_id.data,
5938                    NFS4_MAX_SESSIONID_LEN)) {
5939                 dprintk("%s Invalid session id\n", __func__);
5940                 goto out_err;
5941         }
5942 
5943         p = xdr_inline_decode(xdr, 20);
5944         if (unlikely(!p))
5945                 goto out_overflow;
5946 
5947         /* seqid */
5948         dummy = be32_to_cpup(p++);
5949         if (dummy != res->sr_slot->seq_nr) {
5950                 dprintk("%s Invalid sequence number\n", __func__);
5951                 goto out_err;
5952         }
5953         /* slot id */
5954         dummy = be32_to_cpup(p++);
5955         if (dummy != res->sr_slot->slot_nr) {
5956                 dprintk("%s Invalid slot id\n", __func__);
5957                 goto out_err;
5958         }
5959         /* highest slot id */
5960         res->sr_highest_slotid = be32_to_cpup(p++);
5961         /* target highest slot id */
5962         res->sr_target_highest_slotid = be32_to_cpup(p++);
5963         /* result flags */
5964         res->sr_status_flags = be32_to_cpup(p);
5965         status = 0;
5966 out_err:
5967         res->sr_status = status;
5968         return status;
5969 out_overflow:
5970         print_overflow_msg(__func__, xdr);
5971         status = -EIO;
5972         goto out_err;
5973 #else  /* CONFIG_NFS_V4_1 */
5974         return 0;
5975 #endif /* CONFIG_NFS_V4_1 */
5976 }
5977 
5978 #if defined(CONFIG_NFS_V4_1)
5979 static int decode_layout_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
5980 {
5981         stateid->type = NFS4_LAYOUT_STATEID_TYPE;
5982         return decode_stateid(xdr, stateid);
5983 }
5984 
5985 static int decode_getdeviceinfo(struct xdr_stream *xdr,
5986                                 struct nfs4_getdeviceinfo_res *res)
5987 {
5988         struct pnfs_device *pdev = res->pdev;
5989         __be32 *p;
5990         uint32_t len, type;
5991         int status;
5992 
5993         status = decode_op_hdr(xdr, OP_GETDEVICEINFO);
5994         if (status) {
5995                 if (status == -ETOOSMALL) {
5996                         p = xdr_inline_decode(xdr, 4);
5997                         if (unlikely(!p))
5998                                 goto out_overflow;
5999                         pdev->mincount = be32_to_cpup(p);
6000                         dprintk("%s: Min count too small. mincnt = %u\n",
6001                                 __func__, pdev->mincount);
6002                 }
6003                 return status;
6004         }
6005 
6006         p = xdr_inline_decode(xdr, 8);
6007         if (unlikely(!p))
6008                 goto out_overflow;
6009         type = be32_to_cpup(p++);
6010         if (type != pdev->layout_type) {
6011                 dprintk("%s: layout mismatch req: %u pdev: %u\n",
6012                         __func__, pdev->layout_type, type);
6013                 return -EINVAL;
6014         }
6015         /*
6016          * Get the length of the opaque device_addr4. xdr_read_pages places
6017          * the opaque device_addr4 in the xdr_buf->pages (pnfs_device->pages)
6018          * and places the remaining xdr data in xdr_buf->tail
6019          */
6020         pdev->mincount = be32_to_cpup(p);
6021         if (xdr_read_pages(xdr, pdev->mincount) != pdev->mincount)
6022                 goto out_overflow;
6023 
6024         /* Parse notification bitmap, verifying that it is zero. */
6025         p = xdr_inline_decode(xdr, 4);
6026         if (unlikely(!p))
6027                 goto out_overflow;
6028         len = be32_to_cpup(p);
6029         if (len) {
6030                 uint32_t i;
6031 
6032                 p = xdr_inline_decode(xdr, 4 * len);
6033                 if (unlikely(!p))
6034                         goto out_overflow;
6035 
6036                 res->notification = be32_to_cpup(p++);
6037                 for (i = 1; i < len; i++) {
6038                         if (be32_to_cpup(p++)) {
6039                                 dprintk("%s: unsupported notification\n",
6040                                         __func__);
6041                                 return -EIO;
6042                         }
6043                 }
6044         }
6045         return 0;
6046 out_overflow:
6047         print_overflow_msg(__func__, xdr);
6048         return -EIO;
6049 }
6050 
6051 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
6052                             struct nfs4_layoutget_res *res)
6053 {
6054         __be32 *p;
6055         int status;
6056         u32 layout_count;
6057         u32 recvd;
6058 
6059         status = decode_op_hdr(xdr, OP_LAYOUTGET);
6060         if (status)
6061                 goto out;
6062         p = xdr_inline_decode(xdr, 4);
6063         if (unlikely(!p))
6064                 goto out_overflow;
6065         res->return_on_close = be32_to_cpup(p);
6066         decode_layout_stateid(xdr, &res->stateid);
6067         p = xdr_inline_decode(xdr, 4);
6068         if (unlikely(!p))
6069                 goto out_overflow;
6070         layout_count = be32_to_cpup(p);
6071         if (!layout_count) {
6072                 dprintk("%s: server responded with empty layout array\n",
6073                         __func__);
6074                 status = -EINVAL;
6075                 goto out;
6076         }
6077 
6078         p = xdr_inline_decode(xdr, 28);
6079         if (unlikely(!p))
6080                 goto out_overflow;
6081         p = xdr_decode_hyper(p, &res->range.offset);
6082         p = xdr_decode_hyper(p, &res->range.length);
6083         res->range.iomode = be32_to_cpup(p++);
6084         res->type = be32_to_cpup(p++);
6085         res->layoutp->len = be32_to_cpup(p);
6086 
6087         dprintk("%s roff:%lu rlen:%lu riomode:%d, lo_type:0x%x, lo.len:%d\n",
6088                 __func__,
6089                 (unsigned long)res->range.offset,
6090                 (unsigned long)res->range.length,
6091                 res->range.iomode,
6092                 res->type,
6093                 res->layoutp->len);
6094 
6095         recvd = xdr_read_pages(xdr, res->layoutp->len);
6096         if (res->layoutp->len > recvd) {
6097                 dprintk("NFS: server cheating in layoutget reply: "
6098                                 "layout len %u > recvd %u\n",
6099                                 res->layoutp->len, recvd);
6100                 status = -EINVAL;
6101                 goto out;
6102         }
6103 
6104         if (layout_count > 1) {
6105                 /* We only handle a length one array at the moment.  Any
6106                  * further entries are just ignored.  Note that this means
6107                  * the client may see a response that is less than the
6108                  * minimum it requested.
6109                  */
6110                 dprintk("%s: server responded with %d layouts, dropping tail\n",
6111                         __func__, layout_count);
6112         }
6113 
6114 out:
6115         res->status = status;
6116         return status;
6117 out_overflow:
6118         print_overflow_msg(__func__, xdr);
6119         status = -EIO;
6120         goto out;
6121 }
6122 
6123 static int decode_layoutreturn(struct xdr_stream *xdr,
6124                                struct nfs4_layoutreturn_res *res)
6125 {
6126         __be32 *p;
6127         int status;
6128 
6129         status = decode_op_hdr(xdr, OP_LAYOUTRETURN);
6130         if (status)
6131                 return status;
6132         p = xdr_inline_decode(xdr, 4);
6133         if (unlikely(!p))
6134                 goto out_overflow;
6135         res->lrs_present = be32_to_cpup(p);
6136         if (res->lrs_present)
6137                 status = decode_layout_stateid(xdr, &res->stateid);
6138         else
6139                 nfs4_stateid_copy(&res->stateid, &invalid_stateid);
6140         return status;
6141 out_overflow:
6142         print_overflow_msg(__func__, xdr);
6143         return -EIO;
6144 }
6145 
6146 static int decode_layoutcommit(struct xdr_stream *xdr,
6147                                struct rpc_rqst *req,
6148                                struct nfs4_layoutcommit_res *res)
6149 {
6150         __be32 *p;
6151         __u32 sizechanged;
6152         int status;
6153 
6154         status = decode_op_hdr(xdr, OP_LAYOUTCOMMIT);
6155         res->status = status;
6156         if (status)
6157                 return status;
6158 
6159         p = xdr_inline_decode(xdr, 4);
6160         if (unlikely(!p))
6161                 goto out_overflow;
6162         sizechanged = be32_to_cpup(p);
6163 
6164         if (sizechanged) {
6165                 /* throw away new size */
6166                 p = xdr_inline_decode(xdr, 8);
6167                 if (unlikely(!p))
6168                         goto out_overflow;
6169         }
6170         return 0;
6171 out_overflow:
6172         print_overflow_msg(__func__, xdr);
6173         return -EIO;
6174 }
6175 
6176 static int decode_test_stateid(struct xdr_stream *xdr,
6177                                struct nfs41_test_stateid_res *res)
6178 {
6179         __be32 *p;
6180         int status;
6181         int num_res;
6182 
6183         status = decode_op_hdr(xdr, OP_TEST_STATEID);
6184         if (status)
6185                 return status;
6186 
6187         p = xdr_inline_decode(xdr, 4);
6188         if (unlikely(!p))
6189                 goto out_overflow;
6190         num_res = be32_to_cpup(p++);
6191         if (num_res != 1)
6192                 goto out;
6193 
6194         p = xdr_inline_decode(xdr, 4);
6195         if (unlikely(!p))
6196                 goto out_overflow;
6197         res->status = be32_to_cpup(p++);
6198 
6199         return status;
6200 out_overflow:
6201         print_overflow_msg(__func__, xdr);
6202 out:
6203         return -EIO;
6204 }
6205 
6206 static int decode_free_stateid(struct xdr_stream *xdr,
6207                                struct nfs41_free_stateid_res *res)
6208 {
6209         res->status = decode_op_hdr(xdr, OP_FREE_STATEID);
6210         return res->status;
6211 }
6212 #else
6213 static inline
6214 int decode_layoutreturn(struct xdr_stream *xdr,
6215                                struct nfs4_layoutreturn_res *res)
6216 {
6217         return 0;
6218 }
6219 
6220 static int decode_layoutget(struct xdr_stream *xdr, struct rpc_rqst *req,
6221                             struct nfs4_layoutget_res *res)
6222 {
6223         return 0;
6224 }
6225 
6226 #endif /* CONFIG_NFS_V4_1 */
6227 
6228 /*
6229  * END OF "GENERIC" DECODE ROUTINES.
6230  */
6231 
6232 /*
6233  * Decode OPEN_DOWNGRADE response
6234  */
6235 static int nfs4_xdr_dec_open_downgrade(struct rpc_rqst *rqstp,
6236                                        struct xdr_stream *xdr,
6237                                        void *data)
6238 {
6239         struct nfs_closeres *res = data;
6240         struct compound_hdr hdr;
6241         int status;
6242 
6243         status = decode_compound_hdr(xdr, &hdr);
6244         if (status)
6245                 goto out;
6246         status = decode_sequence(xdr, &res->seq_res, rqstp);
6247         if (status)
6248                 goto out;
6249         status = decode_putfh(xdr);
6250         if (status)
6251                 goto out;
6252         if (res->lr_res) {
6253                 status = decode_layoutreturn(xdr, res->lr_res);
6254                 res->lr_ret = status;
6255                 if (status)
6256                         goto out;
6257         }
6258         status = decode_open_downgrade(xdr, res);
6259 out:
6260         return status;
6261 }
6262 
6263 /*
6264  * Decode ACCESS response
6265  */
6266 static int nfs4_xdr_dec_access(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6267                                void *data)
6268 {
6269         struct nfs4_accessres *res = data;
6270         struct compound_hdr hdr;
6271         int status;
6272 
6273         status = decode_compound_hdr(xdr, &hdr);
6274         if (status)
6275                 goto out;
6276         status = decode_sequence(xdr, &res->seq_res, rqstp);
6277         if (status)
6278                 goto out;
6279         status = decode_putfh(xdr);
6280         if (status != 0)
6281                 goto out;
6282         status = decode_access(xdr, &res->supported, &res->access);
6283         if (status != 0)
6284                 goto out;
6285         if (res->fattr)
6286                 decode_getfattr(xdr, res->fattr, res->server);
6287 out:
6288         return status;
6289 }
6290 
6291 /*
6292  * Decode LOOKUP response
6293  */
6294 static int nfs4_xdr_dec_lookup(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6295                                void *data)
6296 {
6297         struct nfs4_lookup_res *res = data;
6298         struct compound_hdr hdr;
6299         int status;
6300 
6301         status = decode_compound_hdr(xdr, &hdr);
6302         if (status)
6303                 goto out;
6304         status = decode_sequence(xdr, &res->seq_res, rqstp);
6305         if (status)
6306                 goto out;
6307         status = decode_putfh(xdr);
6308         if (status)
6309                 goto out;
6310         status = decode_lookup(xdr);
6311         if (status)
6312                 goto out;
6313         status = decode_getfh(xdr, res->fh);
6314         if (status)
6315                 goto out;
6316         status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6317 out:
6318         return status;
6319 }
6320 
6321 /*
6322  * Decode LOOKUPP response
6323  */
6324 static int nfs4_xdr_dec_lookupp(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6325                 void *data)
6326 {
6327         struct nfs4_lookupp_res *res = data;
6328         struct compound_hdr hdr;
6329         int status;
6330 
6331         status = decode_compound_hdr(xdr, &hdr);
6332         if (status)
6333                 goto out;
6334         status = decode_sequence(xdr, &res->seq_res, rqstp);
6335         if (status)
6336                 goto out;
6337         status = decode_putfh(xdr);
6338         if (status)
6339                 goto out;
6340         status = decode_lookupp(xdr);
6341         if (status)
6342                 goto out;
6343         status = decode_getfh(xdr, res->fh);
6344         if (status)
6345                 goto out;
6346         status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6347 out:
6348         return status;
6349 }
6350 
6351 /*
6352  * Decode LOOKUP_ROOT response
6353  */
6354 static int nfs4_xdr_dec_lookup_root(struct rpc_rqst *rqstp,
6355                                     struct xdr_stream *xdr,
6356                                     void *data)
6357 {
6358         struct nfs4_lookup_res *res = data;
6359         struct compound_hdr hdr;
6360         int status;
6361 
6362         status = decode_compound_hdr(xdr, &hdr);
6363         if (status)
6364                 goto out;
6365         status = decode_sequence(xdr, &res->seq_res, rqstp);
6366         if (status)
6367                 goto out;
6368         status = decode_putrootfh(xdr);
6369         if (status)
6370                 goto out;
6371         status = decode_getfh(xdr, res->fh);
6372         if (status == 0)
6373                 status = decode_getfattr_label(xdr, res->fattr,
6374                                                 res->label, res->server);
6375 out:
6376         return status;
6377 }
6378 
6379 /*
6380  * Decode REMOVE response
6381  */
6382 static int nfs4_xdr_dec_remove(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6383                                void *data)
6384 {
6385         struct nfs_removeres *res = data;
6386         struct compound_hdr hdr;
6387         int status;
6388 
6389         status = decode_compound_hdr(xdr, &hdr);
6390         if (status)
6391                 goto out;
6392         status = decode_sequence(xdr, &res->seq_res, rqstp);
6393         if (status)
6394                 goto out;
6395         status = decode_putfh(xdr);
6396         if (status)
6397                 goto out;
6398         status = decode_remove(xdr, &res->cinfo);
6399 out:
6400         return status;
6401 }
6402 
6403 /*
6404  * Decode RENAME response
6405  */
6406 static int nfs4_xdr_dec_rename(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6407                                void *data)
6408 {
6409         struct nfs_renameres *res = data;
6410         struct compound_hdr hdr;
6411         int status;
6412 
6413         status = decode_compound_hdr(xdr, &hdr);
6414         if (status)
6415                 goto out;
6416         status = decode_sequence(xdr, &res->seq_res, rqstp);
6417         if (status)
6418                 goto out;
6419         status = decode_putfh(xdr);
6420         if (status)
6421                 goto out;
6422         status = decode_savefh(xdr);
6423         if (status)
6424                 goto out;
6425         status = decode_putfh(xdr);
6426         if (status)
6427                 goto out;
6428         status = decode_rename(xdr, &res->old_cinfo, &res->new_cinfo);
6429 out:
6430         return status;
6431 }
6432 
6433 /*
6434  * Decode LINK response
6435  */
6436 static int nfs4_xdr_dec_link(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6437                              void *data)
6438 {
6439         struct nfs4_link_res *res = data;
6440         struct compound_hdr hdr;
6441         int status;
6442 
6443         status = decode_compound_hdr(xdr, &hdr);
6444         if (status)
6445                 goto out;
6446         status = decode_sequence(xdr, &res->seq_res, rqstp);
6447         if (status)
6448                 goto out;
6449         status = decode_putfh(xdr);
6450         if (status)
6451                 goto out;
6452         status = decode_savefh(xdr);
6453         if (status)
6454                 goto out;
6455         status = decode_putfh(xdr);
6456         if (status)
6457                 goto out;
6458         status = decode_link(xdr, &res->cinfo);
6459         if (status)
6460                 goto out;
6461         /*
6462          * Note order: OP_LINK leaves the directory as the current
6463          *             filehandle.
6464          */
6465         status = decode_restorefh(xdr);
6466         if (status)
6467                 goto out;
6468         decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6469 out:
6470         return status;
6471 }
6472 
6473 /*
6474  * Decode CREATE response
6475  */
6476 static int nfs4_xdr_dec_create(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6477                                void *data)
6478 {
6479         struct nfs4_create_res *res = data;
6480         struct compound_hdr hdr;
6481         int status;
6482 
6483         status = decode_compound_hdr(xdr, &hdr);
6484         if (status)
6485                 goto out;
6486         status = decode_sequence(xdr, &res->seq_res, rqstp);
6487         if (status)
6488                 goto out;
6489         status = decode_putfh(xdr);
6490         if (status)
6491                 goto out;
6492         status = decode_create(xdr, &res->dir_cinfo);
6493         if (status)
6494                 goto out;
6495         status = decode_getfh(xdr, res->fh);
6496         if (status)
6497                 goto out;
6498         decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6499 out:
6500         return status;
6501 }
6502 
6503 /*
6504  * Decode SYMLINK response
6505  */
6506 static int nfs4_xdr_dec_symlink(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6507                                 void *res)
6508 {
6509         return nfs4_xdr_dec_create(rqstp, xdr, res);
6510 }
6511 
6512 /*
6513  * Decode GETATTR response
6514  */
6515 static int nfs4_xdr_dec_getattr(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6516                                 void *data)
6517 {
6518         struct nfs4_getattr_res *res = data;
6519         struct compound_hdr hdr;
6520         int status;
6521 
6522         status = decode_compound_hdr(xdr, &hdr);
6523         if (status)
6524                 goto out;
6525         status = decode_sequence(xdr, &res->seq_res, rqstp);
6526         if (status)
6527                 goto out;
6528         status = decode_putfh(xdr);
6529         if (status)
6530                 goto out;
6531         status = decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6532 out:
6533         return status;
6534 }
6535 
6536 /*
6537  * Encode an SETACL request
6538  */
6539 static void nfs4_xdr_enc_setacl(struct rpc_rqst *req, struct xdr_stream *xdr,
6540                                 const void *data)
6541 {
6542         const struct nfs_setaclargs *args = data;
6543         struct compound_hdr hdr = {
6544                 .minorversion = nfs4_xdr_minorversion(&args->seq_args),
6545         };
6546 
6547         encode_compound_hdr(xdr, req, &hdr);
6548         encode_sequence(xdr, &args->seq_args, &hdr);
6549         encode_putfh(xdr, args->fh, &hdr);
6550         encode_setacl(xdr, args, &hdr);
6551         encode_nops(&hdr);
6552 }
6553 
6554 /*
6555  * Decode SETACL response
6556  */
6557 static int
6558 nfs4_xdr_dec_setacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6559                     void *data)
6560 {
6561         struct nfs_setaclres *res = data;
6562         struct compound_hdr hdr;
6563         int status;
6564 
6565         status = decode_compound_hdr(xdr, &hdr);
6566         if (status)
6567                 goto out;
6568         status = decode_sequence(xdr, &res->seq_res, rqstp);
6569         if (status)
6570                 goto out;
6571         status = decode_putfh(xdr);
6572         if (status)
6573                 goto out;
6574         status = decode_setattr(xdr);
6575 out:
6576         return status;
6577 }
6578 
6579 /*
6580  * Decode GETACL response
6581  */
6582 static int
6583 nfs4_xdr_dec_getacl(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6584                     void *data)
6585 {
6586         struct nfs_getaclres *res = data;
6587         struct compound_hdr hdr;
6588         int status;
6589 
6590         if (res->acl_scratch != NULL) {
6591                 void *p = page_address(res->acl_scratch);
6592                 xdr_set_scratch_buffer(xdr, p, PAGE_SIZE);
6593         }
6594         status = decode_compound_hdr(xdr, &hdr);
6595         if (status)
6596                 goto out;
6597         status = decode_sequence(xdr, &res->seq_res, rqstp);
6598         if (status)
6599                 goto out;
6600         status = decode_putfh(xdr);
6601         if (status)
6602                 goto out;
6603         status = decode_getacl(xdr, rqstp, res);
6604 
6605 out:
6606         return status;
6607 }
6608 
6609 /*
6610  * Decode CLOSE response
6611  */
6612 static int nfs4_xdr_dec_close(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6613                               void *data)
6614 {
6615         struct nfs_closeres *res = data;
6616         struct compound_hdr hdr;
6617         int status;
6618 
6619         status = decode_compound_hdr(xdr, &hdr);
6620         if (status)
6621                 goto out;
6622         status = decode_sequence(xdr, &res->seq_res, rqstp);
6623         if (status)
6624                 goto out;
6625         status = decode_putfh(xdr);
6626         if (status)
6627                 goto out;
6628         if (res->lr_res) {
6629                 status = decode_layoutreturn(xdr, res->lr_res);
6630                 res->lr_ret = status;
6631                 if (status)
6632                         goto out;
6633         }
6634         if (res->fattr != NULL) {
6635                 status = decode_getfattr(xdr, res->fattr, res->server);
6636                 if (status != 0)
6637                         goto out;
6638         }
6639         status = decode_close(xdr, res);
6640 out:
6641         return status;
6642 }
6643 
6644 /*
6645  * Decode OPEN response
6646  */
6647 static int nfs4_xdr_dec_open(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6648                              void *data)
6649 {
6650         struct nfs_openres *res = data;
6651         struct compound_hdr hdr;
6652         int status;
6653 
6654         status = decode_compound_hdr(xdr, &hdr);
6655         if (status)
6656                 goto out;
6657         status = decode_sequence(xdr, &res->seq_res, rqstp);
6658         if (status)
6659                 goto out;
6660         status = decode_putfh(xdr);
6661         if (status)
6662                 goto out;
6663         status = decode_open(xdr, res);
6664         if (status)
6665                 goto out;
6666         status = decode_getfh(xdr, &res->fh);
6667         if (status)
6668                 goto out;
6669         if (res->access_request)
6670                 decode_access(xdr, &res->access_supported, &res->access_result);
6671         decode_getfattr_label(xdr, res->f_attr, res->f_label, res->server);
6672         if (res->lg_res)
6673                 decode_layoutget(xdr, rqstp, res->lg_res);
6674 out:
6675         return status;
6676 }
6677 
6678 /*
6679  * Decode OPEN_CONFIRM response
6680  */
6681 static int nfs4_xdr_dec_open_confirm(struct rpc_rqst *rqstp,
6682                                      struct xdr_stream *xdr,
6683                                      void *data)
6684 {
6685         struct nfs_open_confirmres *res = data;
6686         struct compound_hdr hdr;
6687         int status;
6688 
6689         status = decode_compound_hdr(xdr, &hdr);
6690         if (status)
6691                 goto out;
6692         status = decode_putfh(xdr);
6693         if (status)
6694                 goto out;
6695         status = decode_open_confirm(xdr, res);
6696 out:
6697         return status;
6698 }
6699 
6700 /*
6701  * Decode OPEN response
6702  */
6703 static int nfs4_xdr_dec_open_noattr(struct rpc_rqst *rqstp,
6704                                     struct xdr_stream *xdr,
6705                                     void *data)
6706 {
6707         struct nfs_openres *res = data;
6708         struct compound_hdr hdr;
6709         int status;
6710 
6711         status = decode_compound_hdr(xdr, &hdr);
6712         if (status)
6713                 goto out;
6714         status = decode_sequence(xdr, &res->seq_res, rqstp);
6715         if (status)
6716                 goto out;
6717         status = decode_putfh(xdr);
6718         if (status)
6719                 goto out;
6720         status = decode_open(xdr, res);
6721         if (status)
6722                 goto out;
6723         if (res->access_request)
6724                 decode_access(xdr, &res->access_supported, &res->access_result);
6725         decode_getfattr(xdr, res->f_attr, res->server);
6726         if (res->lg_res)
6727                 decode_layoutget(xdr, rqstp, res->lg_res);
6728 out:
6729         return status;
6730 }
6731 
6732 /*
6733  * Decode SETATTR response
6734  */
6735 static int nfs4_xdr_dec_setattr(struct rpc_rqst *rqstp,
6736                                 struct xdr_stream *xdr,
6737                                 void *data)
6738 {
6739         struct nfs_setattrres *res = data;
6740         struct compound_hdr hdr;
6741         int status;
6742 
6743         status = decode_compound_hdr(xdr, &hdr);
6744         if (status)
6745                 goto out;
6746         status = decode_sequence(xdr, &res->seq_res, rqstp);
6747         if (status)
6748                 goto out;
6749         status = decode_putfh(xdr);
6750         if (status)
6751                 goto out;
6752         status = decode_setattr(xdr);
6753         if (status)
6754                 goto out;
6755         decode_getfattr_label(xdr, res->fattr, res->label, res->server);
6756 out:
6757         return status;
6758 }
6759 
6760 /*
6761  * Decode LOCK response
6762  */
6763 static int nfs4_xdr_dec_lock(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6764                              void *data)
6765 {
6766         struct nfs_lock_res *res = data;
6767         struct compound_hdr hdr;
6768         int status;
6769 
6770         status = decode_compound_hdr(xdr, &hdr);
6771         if (status)
6772                 goto out;
6773         status = decode_sequence(xdr, &res->seq_res, rqstp);
6774         if (status)
6775                 goto out;
6776         status = decode_putfh(xdr);
6777         if (status)
6778                 goto out;
6779         status = decode_lock(xdr, res);
6780 out:
6781         return status;
6782 }
6783 
6784 /*
6785  * Decode LOCKT response
6786  */
6787 static int nfs4_xdr_dec_lockt(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6788                               void *data)
6789 {
6790         struct nfs_lockt_res *res = data;
6791         struct compound_hdr hdr;
6792         int status;
6793 
6794         status = decode_compound_hdr(xdr, &hdr);
6795         if (status)
6796                 goto out;
6797         status = decode_sequence(xdr, &res->seq_res, rqstp);
6798         if (status)
6799                 goto out;
6800         status = decode_putfh(xdr);
6801         if (status)
6802                 goto out;
6803         status = decode_lockt(xdr, res);
6804 out:
6805         return status;
6806 }
6807 
6808 /*
6809  * Decode LOCKU response
6810  */
6811 static int nfs4_xdr_dec_locku(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6812                               void *data)
6813 {
6814         struct nfs_locku_res *res = data;
6815         struct compound_hdr hdr;
6816         int status;
6817 
6818         status = decode_compound_hdr(xdr, &hdr);
6819         if (status)
6820                 goto out;
6821         status = decode_sequence(xdr, &res->seq_res, rqstp);
6822         if (status)
6823                 goto out;
6824         status = decode_putfh(xdr);
6825         if (status)
6826                 goto out;
6827         status = decode_locku(xdr, res);
6828 out:
6829         return status;
6830 }
6831 
6832 static int nfs4_xdr_dec_release_lockowner(struct rpc_rqst *rqstp,
6833                                           struct xdr_stream *xdr, void *dummy)
6834 {
6835         struct compound_hdr hdr;
6836         int status;
6837 
6838         status = decode_compound_hdr(xdr, &hdr);
6839         if (!status)
6840                 status = decode_release_lockowner(xdr);
6841         return status;
6842 }
6843 
6844 /*
6845  * Decode READLINK response
6846  */
6847 static int nfs4_xdr_dec_readlink(struct rpc_rqst *rqstp,
6848                                  struct xdr_stream *xdr,
6849                                  void *data)
6850 {
6851         struct nfs4_readlink_res *res = data;
6852         struct compound_hdr hdr;
6853         int status;
6854 
6855         status = decode_compound_hdr(xdr, &hdr);
6856         if (status)
6857                 goto out;
6858         status = decode_sequence(xdr, &res->seq_res, rqstp);
6859         if (status)
6860                 goto out;
6861         status = decode_putfh(xdr);
6862         if (status)
6863                 goto out;
6864         status = decode_readlink(xdr, rqstp);
6865 out:
6866         return status;
6867 }
6868 
6869 /*
6870  * Decode READDIR response
6871  */
6872 static int nfs4_xdr_dec_readdir(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6873                                 void *data)
6874 {
6875         struct nfs4_readdir_res *res = data;
6876         struct compound_hdr hdr;
6877         int status;
6878 
6879         status = decode_compound_hdr(xdr, &hdr);
6880         if (status)
6881                 goto out;
6882         status = decode_sequence(xdr, &res->seq_res, rqstp);
6883         if (status)
6884                 goto out;
6885         status = decode_putfh(xdr);
6886         if (status)
6887                 goto out;
6888         status = decode_readdir(xdr, rqstp, res);
6889 out:
6890         return status;
6891 }
6892 
6893 /*
6894  * Decode Read response
6895  */
6896 static int nfs4_xdr_dec_read(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6897                              void *data)
6898 {
6899         struct nfs_pgio_res *res = data;
6900         struct compound_hdr hdr;
6901         int status;
6902 
6903         status = decode_compound_hdr(xdr, &hdr);
6904         res->op_status = hdr.status;
6905         if (status)
6906                 goto out;
6907         status = decode_sequence(xdr, &res->seq_res, rqstp);
6908         if (status)
6909                 goto out;
6910         status = decode_putfh(xdr);
6911         if (status)
6912                 goto out;
6913         status = decode_read(xdr, rqstp, res);
6914         if (!status)
6915                 status = res->count;
6916 out:
6917         return status;
6918 }
6919 
6920 /*
6921  * Decode WRITE response
6922  */
6923 static int nfs4_xdr_dec_write(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6924                               void *data)
6925 {
6926         struct nfs_pgio_res *res = data;
6927         struct compound_hdr hdr;
6928         int status;
6929 
6930         status = decode_compound_hdr(xdr, &hdr);
6931         res->op_status = hdr.status;
6932         if (status)
6933                 goto out;
6934         status = decode_sequence(xdr, &res->seq_res, rqstp);
6935         if (status)
6936                 goto out;
6937         status = decode_putfh(xdr);
6938         if (status)
6939                 goto out;
6940         status = decode_write(xdr, res);
6941         if (status)
6942                 goto out;
6943         if (res->fattr)
6944                 decode_getfattr(xdr, res->fattr, res->server);
6945         if (!status)
6946                 status = res->count;
6947 out:
6948         return status;
6949 }
6950 
6951 /*
6952  * Decode COMMIT response
6953  */
6954 static int nfs4_xdr_dec_commit(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
6955                                void *data)
6956 {
6957         struct nfs_commitres *res = data;
6958         struct compound_hdr hdr;
6959         int status;
6960 
6961         status = decode_compound_hdr(xdr, &hdr);
6962         res->op_status = hdr.status;
6963         if (status)
6964                 goto out;
6965         status = decode_sequence(xdr, &res->seq_res, rqstp);
6966         if (status)
6967                 goto out;
6968         status = decode_putfh(xdr);
6969         if (status)
6970                 goto out;
6971         status = decode_commit(xdr, res);
6972 out:
6973         return status;
6974 }
6975 
6976 /*
6977  * Decode FSINFO response
6978  */
6979 static int nfs4_xdr_dec_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
6980                                void *data)
6981 {
6982         struct nfs4_fsinfo_res *res = data;
6983         struct compound_hdr hdr;
6984         int status;
6985 
6986         status = decode_compound_hdr(xdr, &hdr);
6987         if (!status)
6988                 status = decode_sequence(xdr, &res->seq_res, req);
6989         if (!status)
6990                 status = decode_putfh(xdr);
6991         if (!status)
6992                 status = decode_fsinfo(xdr, res->fsinfo);
6993         return status;
6994 }
6995 
6996 /*
6997  * Decode PATHCONF response
6998  */
6999 static int nfs4_xdr_dec_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
7000                                  void *data)
7001 {
7002         struct nfs4_pathconf_res *res = data;
7003         struct compound_hdr hdr;
7004         int status;
7005 
7006         status = decode_compound_hdr(xdr, &hdr);
7007         if (!status)
7008                 status = decode_sequence(xdr, &res->seq_res, req);
7009         if (!status)
7010                 status = decode_putfh(xdr);
7011         if (!status)
7012                 status = decode_pathconf(xdr, res->pathconf);
7013         return status;
7014 }
7015 
7016 /*
7017  * Decode STATFS response
7018  */
7019 static int nfs4_xdr_dec_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
7020                                void *data)
7021 {
7022         struct nfs4_statfs_res *res = data;
7023         struct compound_hdr hdr;
7024         int status;
7025 
7026         status = decode_compound_hdr(xdr, &hdr);
7027         if (!status)
7028                 status = decode_sequence(xdr, &res->seq_res, req);
7029         if (!status)
7030                 status = decode_putfh(xdr);
7031         if (!status)
7032                 status = decode_statfs(xdr, res->fsstat);
7033         return status;
7034 }
7035 
7036 /*
7037  * Decode GETATTR_BITMAP response
7038  */
7039 static int nfs4_xdr_dec_server_caps(struct rpc_rqst *req,
7040                                     struct xdr_stream *xdr,
7041                                     void *data)
7042 {
7043         struct nfs4_server_caps_res *res = data;
7044         struct compound_hdr hdr;
7045         int status;
7046 
7047         status = decode_compound_hdr(xdr, &hdr);
7048         if (status)
7049                 goto out;
7050         status = decode_sequence(xdr, &res->seq_res, req);
7051         if (status)
7052                 goto out;
7053         status = decode_putfh(xdr);
7054         if (status)
7055                 goto out;
7056         status = decode_server_caps(xdr, res);
7057 out:
7058         return status;
7059 }
7060 
7061 /*
7062  * Decode RENEW response
7063  */
7064 static int nfs4_xdr_dec_renew(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
7065                               void *__unused)
7066 {
7067         struct compound_hdr hdr;
7068         int status;
7069 
7070         status = decode_compound_hdr(xdr, &hdr);
7071         if (!status)
7072                 status = decode_renew(xdr);
7073         return status;
7074 }
7075 
7076 /*
7077  * Decode SETCLIENTID response
7078  */
7079 static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
7080                                     struct xdr_stream *xdr,
7081                                     void *data)
7082 {
7083         struct nfs4_setclientid_res *res = data;
7084         struct compound_hdr hdr;
7085         int status;
7086 
7087         status = decode_compound_hdr(xdr, &hdr);
7088         if (!status)
7089                 status = decode_setclientid(xdr, res);
7090         return status;
7091 }
7092 
7093 /*
7094  * Decode SETCLIENTID_CONFIRM response
7095  */
7096 static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
7097                                             struct xdr_stream *xdr,
7098                                             void *data)
7099 {
7100         struct compound_hdr hdr;
7101         int status;
7102 
7103         status = decode_compound_hdr(xdr, &hdr);
7104         if (!status)
7105                 status = decode_setclientid_confirm(xdr);
7106         return status;
7107 }
7108 
7109 /*
7110  * Decode DELEGRETURN response
7111  */
7112 static int nfs4_xdr_dec_delegreturn(struct rpc_rqst *rqstp,
7113                                     struct xdr_stream *xdr,
7114                                     void *data)
7115 {
7116         struct nfs4_delegreturnres *res = data;
7117         struct compound_hdr hdr;
7118         int status;
7119 
7120         status = decode_compound_hdr(xdr, &hdr);
7121         if (status)
7122                 goto out;
7123         status = decode_sequence(xdr, &res->seq_res, rqstp);
7124         if (status)
7125                 goto out;
7126         status = decode_putfh(xdr);
7127         if (status != 0)
7128                 goto out;
7129         if (res->lr_res) {
7130                 status = decode_layoutreturn(xdr, res->lr_res);
7131                 res->lr_ret = status;
7132                 if (status)
7133                         goto out;
7134         }
7135         if (res->fattr) {
7136                 status = decode_getfattr(xdr, res->fattr, res->server);
7137                 if (status != 0)
7138                         goto out;
7139         }
7140         status = decode_delegreturn(xdr);
7141 out:
7142         return status;
7143 }
7144 
7145 /*
7146  * Decode FS_LOCATIONS response
7147  */
7148 static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req,
7149                                      struct xdr_stream *xdr,
7150                                      void *data)
7151 {
7152         struct nfs4_fs_locations_res *res = data;
7153         struct compound_hdr hdr;
7154         int status;
7155 
7156         status = decode_compound_hdr(xdr, &hdr);
7157         if (status)
7158                 goto out;
7159         status = decode_sequence(xdr, &res->seq_res, req);
7160         if (status)
7161                 goto out;
7162         status = decode_putfh(xdr);
7163         if (status)
7164                 goto out;
7165         if (res->migration) {
7166                 xdr_enter_page(xdr, PAGE_SIZE);
7167                 status = decode_getfattr_generic(xdr,
7168                                         &res->fs_locations->fattr,
7169                                          NULL, res->fs_locations,
7170                                          NULL, res->fs_locations->server);
7171                 if (status)
7172                         goto out;
7173                 if (res->renew)
7174                         status = decode_renew(xdr);
7175         } else {
7176                 status = decode_lookup(xdr);
7177                 if (status)
7178                         goto out;
7179                 xdr_enter_page(xdr, PAGE_SIZE);
7180                 status = decode_getfattr_generic(xdr,
7181                                         &res->fs_locations->fattr,
7182                                          NULL, res->fs_locations,
7183                                          NULL, res->fs_locations->server);
7184         }
7185 out:
7186         return status;
7187 }
7188 
7189 /*
7190  * Decode SECINFO response
7191  */
7192 static int nfs4_xdr_dec_secinfo(struct rpc_rqst *rqstp,
7193                                 struct xdr_stream *xdr,
7194                                 void *data)
7195 {
7196         struct nfs4_secinfo_res *res = data;
7197         struct compound_hdr hdr;
7198         int status;
7199 
7200         status = decode_compound_hdr(xdr, &hdr);
7201         if (status)
7202                 goto out;
7203         status = decode_sequence(xdr, &res->seq_res, rqstp);
7204         if (status)
7205                 goto out;
7206         status = decode_putfh(xdr);
7207         if (status)
7208                 goto out;
7209         status = decode_secinfo(xdr, res);
7210 out:
7211         return status;
7212 }
7213 
7214 /*
7215  * Decode FSID_PRESENT response
7216  */
7217 static int nfs4_xdr_dec_fsid_present(struct rpc_rqst *rqstp,
7218                                      struct xdr_stream *xdr,
7219                                      void *data)
7220 {
7221         struct nfs4_fsid_present_res *res = data;
7222         struct compound_hdr hdr;
7223         int status;
7224 
7225         status = decode_compound_hdr(xdr, &hdr);
7226         if (status)
7227                 goto out;
7228         status = decode_sequence(xdr, &res->seq_res, rqstp);
7229         if (status)
7230                 goto out;
7231         status = decode_putfh(xdr);
7232         if (status)
7233                 goto out;
7234         status = decode_getfh(xdr, res->fh);
7235         if (status)
7236                 goto out;
7237         if (res->renew)
7238                 status = decode_renew(xdr);
7239 out:
7240         return status;
7241 }
7242 
7243 #if defined(CONFIG_NFS_V4_1)
7244 /*
7245  * Decode BIND_CONN_TO_SESSION response
7246  */
7247 static int nfs4_xdr_dec_bind_conn_to_session(struct rpc_rqst *rqstp,
7248                                         struct xdr_stream *xdr,
7249                                         void *res)
7250 {
7251         struct compound_hdr hdr;
7252         int status;
7253 
7254         status = decode_compound_hdr(xdr, &hdr);
7255         if (!status)
7256                 status = decode_bind_conn_to_session(xdr, res);
7257         return status;
7258 }
7259 
7260 /*
7261  * Decode EXCHANGE_ID response
7262  */
7263 static int nfs4_xdr_dec_exchange_id(struct rpc_rqst *rqstp,
7264                                     struct xdr_stream *xdr,
7265                                     void *res)
7266 {
7267         struct compound_hdr hdr;
7268         int status;
7269 
7270         status = decode_compound_hdr(xdr, &hdr);
7271         if (!status)
7272                 status = decode_exchange_id(xdr, res);
7273         return status;
7274 }
7275 
7276 /*
7277  * Decode CREATE_SESSION response
7278  */
7279 static int nfs4_xdr_dec_create_session(struct rpc_rqst *rqstp,
7280                                        struct xdr_stream *xdr,
7281                                        void *res)
7282 {
7283         struct compound_hdr hdr;
7284         int status;
7285 
7286         status = decode_compound_hdr(xdr, &hdr);
7287         if (!status)
7288                 status = decode_create_session(xdr, res);
7289         return status;
7290 }
7291 
7292 /*
7293  * Decode DESTROY_SESSION response
7294  */
7295 static int nfs4_xdr_dec_destroy_session(struct rpc_rqst *rqstp,
7296                                         struct xdr_stream *xdr,
7297                                         void *res)
7298 {
7299         struct compound_hdr hdr;
7300         int status;
7301 
7302         status = decode_compound_hdr(xdr, &hdr);
7303         if (!status)
7304                 status = decode_destroy_session(xdr, res);
7305         return status;
7306 }
7307 
7308 /*
7309  * Decode DESTROY_CLIENTID response
7310  */
7311 static int nfs4_xdr_dec_destroy_clientid(struct rpc_rqst *rqstp,
7312                                         struct xdr_stream *xdr,
7313                                         void *res)
7314 {
7315         struct compound_hdr hdr;
7316         int status;
7317 
7318         status = decode_compound_hdr(xdr, &hdr);
7319         if (!status)
7320                 status = decode_destroy_clientid(xdr, res);
7321         return status;
7322 }
7323 
7324 /*
7325  * Decode SEQUENCE response
7326  */
7327 static int nfs4_xdr_dec_sequence(struct rpc_rqst *rqstp,
7328                                  struct xdr_stream *xdr,
7329                                  void *res)
7330 {
7331         struct compound_hdr hdr;
7332         int status;
7333 
7334         status = decode_compound_hdr(xdr, &hdr);
7335         if (!status)
7336                 status = decode_sequence(xdr, res, rqstp);
7337         return status;
7338 }
7339 
7340 /*
7341  * Decode GET_LEASE_TIME response
7342  */
7343 static int nfs4_xdr_dec_get_lease_time(struct rpc_rqst *rqstp,
7344                                        struct xdr_stream *xdr,
7345                                        void *data)
7346 {
7347         struct nfs4_get_lease_time_res *res = data;
7348         struct compound_hdr hdr;
7349         int status;
7350 
7351         status = decode_compound_hdr(xdr, &hdr);
7352         if (!status)
7353                 status = decode_sequence(xdr, &res->lr_seq_res, rqstp);
7354         if (!status)
7355                 status = decode_putrootfh(xdr);
7356         if (!status)
7357                 status = decode_fsinfo(xdr, res->lr_fsinfo);
7358         return status;
7359 }
7360 
7361 /*
7362  * Decode RECLAIM_COMPLETE response
7363  */
7364 static int nfs4_xdr_dec_reclaim_complete(struct rpc_rqst *rqstp,
7365                                          struct xdr_stream *xdr,
7366                                          void *data)
7367 {
7368         struct nfs41_reclaim_complete_res *res = data;
7369         struct compound_hdr hdr;
7370         int status;
7371 
7372         status = decode_compound_hdr(xdr, &hdr);
7373         if (!status)
7374                 status = decode_sequence(xdr, &res->seq_res, rqstp);
7375         if (!status)
7376                 status = decode_reclaim_complete(xdr, NULL);
7377         return status;
7378 }
7379 
7380 /*
7381  * Decode GETDEVINFO response
7382  */
7383 static int nfs4_xdr_dec_getdeviceinfo(struct rpc_rqst *rqstp,
7384                                       struct xdr_stream *xdr,
7385                                       void *data)
7386 {
7387         struct nfs4_getdeviceinfo_res *res = data;
7388         struct compound_hdr hdr;
7389         int status;
7390 
7391         status = decode_compound_hdr(xdr, &hdr);
7392         if (status != 0)
7393                 goto out;
7394         status = decode_sequence(xdr, &res->seq_res, rqstp);
7395         if (status != 0)
7396                 goto out;
7397         status = decode_getdeviceinfo(xdr, res);
7398 out:
7399         return status;
7400 }
7401 
7402 /*
7403  * Decode LAYOUTGET response
7404  */
7405 static int nfs4_xdr_dec_layoutget(struct rpc_rqst *rqstp,
7406                                   struct xdr_stream *xdr,
7407                                   void *data)
7408 {
7409         struct nfs4_layoutget_res *res = data;
7410         struct compound_hdr hdr;
7411         int status;
7412 
7413         status = decode_compound_hdr(xdr, &hdr);
7414         if (status)
7415                 goto out;
7416         status = decode_sequence(xdr, &res->seq_res, rqstp);
7417         if (status)
7418                 goto out;
7419         status = decode_putfh(xdr);
7420         if (status)
7421                 goto out;
7422         status = decode_layoutget(xdr, rqstp, res);
7423 out:
7424         return status;
7425 }
7426 
7427 /*
7428  * Decode LAYOUTRETURN response
7429  */
7430 static int nfs4_xdr_dec_layoutreturn(struct rpc_rqst *rqstp,
7431                                      struct xdr_stream *xdr,
7432                                      void *data)
7433 {
7434         struct nfs4_layoutreturn_res *res = data;
7435         struct compound_hdr hdr;
7436         int status;
7437 
7438         status = decode_compound_hdr(xdr, &hdr);
7439         if (status)
7440                 goto out;
7441         status = decode_sequence(xdr, &res->seq_res, rqstp);
7442         if (status)
7443                 goto out;
7444         status = decode_putfh(xdr);
7445         if (status)
7446                 goto out;
7447         status = decode_layoutreturn(xdr, res);
7448 out:
7449         return status;
7450 }
7451 
7452 /*
7453  * Decode LAYOUTCOMMIT response
7454  */
7455 static int nfs4_xdr_dec_layoutcommit(struct rpc_rqst *rqstp,
7456                                      struct xdr_stream *xdr,
7457                                      void *data)
7458 {
7459         struct nfs4_layoutcommit_res *res = data;
7460         struct compound_hdr hdr;
7461         int status;
7462 
7463         status = decode_compound_hdr(xdr, &hdr);
7464         if (status)
7465                 goto out;
7466         status = decode_sequence(xdr, &res->seq_res, rqstp);
7467         if (status)
7468                 goto out;
7469         status = decode_putfh(xdr);
7470         if (status)
7471                 goto out;
7472         status = decode_layoutcommit(xdr, rqstp, res);
7473         if (status)
7474                 goto out;
7475         decode_getfattr(xdr, res->fattr, res->server);
7476 out:
7477         return status;
7478 }
7479 
7480 /*
7481  * Decode SECINFO_NO_NAME response
7482  */
7483 static int nfs4_xdr_dec_secinfo_no_name(struct rpc_rqst *rqstp,
7484                                         struct xdr_stream *xdr,
7485                                         void *data)
7486 {
7487         struct nfs4_secinfo_res *res = data;
7488         struct compound_hdr hdr;
7489         int status;
7490 
7491         status = decode_compound_hdr(xdr, &hdr);
7492         if (status)
7493                 goto out;
7494         status = decode_sequence(xdr, &res->seq_res, rqstp);
7495         if (status)
7496                 goto out;
7497         status = decode_putrootfh(xdr);
7498         if (status)
7499                 goto out;
7500         status = decode_secinfo_no_name(xdr, res);
7501 out:
7502         return status;
7503 }
7504 
7505 /*
7506  * Decode TEST_STATEID response
7507  */
7508 static int nfs4_xdr_dec_test_stateid(struct rpc_rqst *rqstp,
7509                                      struct xdr_stream *xdr,
7510                                      void *data)
7511 {
7512         struct nfs41_test_stateid_res *res = data;
7513         struct compound_hdr hdr;
7514         int status;
7515 
7516         status = decode_compound_hdr(xdr, &hdr);
7517         if (status)
7518                 goto out;
7519         status = decode_sequence(xdr, &res->seq_res, rqstp);
7520         if (status)
7521                 goto out;
7522         status = decode_test_stateid(xdr, res);
7523 out:
7524         return status;
7525 }
7526 
7527 /*
7528  * Decode FREE_STATEID response
7529  */
7530 static int nfs4_xdr_dec_free_stateid(struct rpc_rqst *rqstp,
7531                                      struct xdr_stream *xdr,
7532                                      void *data)
7533 {
7534         struct nfs41_free_stateid_res *res = data;
7535         struct compound_hdr hdr;
7536         int status;
7537 
7538         status = decode_compound_hdr(xdr, &hdr);
7539         if (status)
7540                 goto out;
7541         status = decode_sequence(xdr, &res->seq_res, rqstp);
7542         if (status)
7543                 goto out;
7544         status = decode_free_stateid(xdr, res);
7545 out:
7546         return status;
7547 }
7548 #endif /* CONFIG_NFS_V4_1 */
7549 
7550 /**
7551  * nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
7552  *                      the local page cache.
7553  * @xdr: XDR stream where entry resides
7554  * @entry: buffer to fill in with entry data
7555  * @plus: boolean indicating whether this should be a readdirplus entry
7556  *
7557  * Returns zero if successful, otherwise a negative errno value is
7558  * returned.
7559  *
7560  * This function is not invoked during READDIR reply decoding, but
7561  * rather whenever an application invokes the getdents(2) system call
7562  * on a directory already in our cache.
7563  */
7564 int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
7565                        bool plus)
7566 {
7567         unsigned int savep;
7568         uint32_