projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
NFS: Let mount data parsing set the NFS version
[deliverable/linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
2446ab60 56#include <linux/rcupdate.h>
f7b422b1 57
f7b422b1
DH		 58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
1e657bd5
PZ		 70#ifdef CONFIG_NFS_V3
71#define NFS_DEFAULT_VERSION 3
72#else
73#define NFS_DEFAULT_VERSION 2
74#endif
75
bf0fd768
CL		 76enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
bf0fd768
CL		 79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
2cf7ff7a 83 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
75180df2 86 Opt_sharecache, Opt_nosharecache,
d740351b 87 Opt_resvport, Opt_noresvport,
b797cac7 88 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
e887cbcf 99 Opt_mountvers,
3fd5be9e 100 Opt_minorversion,
bf0fd768
CL		 101
102 /* Mount options that take string arguments */
0d71b058 103 Opt_nfsvers,
33832034 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 106 Opt_lookupcache,
b797cac7 107 Opt_fscache_uniq,
5eebde23 108 Opt_local_lock,
bf0fd768 109
f45663ce
CL		 110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 112
113 Opt_err
114};
115
a447c093 116static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
ecbb3845
CL		 119 { Opt_userspace, "retry=%s" },
120
f45663ce
CL		 121 { Opt_sloppy, "sloppy" },
122
bf0fd768
CL		 123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
d33e4dfe
CL		 125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
bf0fd768
CL		 127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
bf0fd768
CL		 135 { Opt_udp, "udp" },
136 { Opt_tcp, "tcp" },
2cf7ff7a 137 { Opt_rdma, "rdma" },
bf0fd768
CL		 138 { Opt_acl, "acl" },
139 { Opt_noacl, "noacl" },
140 { Opt_rdirplus, "rdirplus" },
141 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 142 { Opt_sharecache, "sharecache" },
143 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 144 { Opt_resvport, "resvport" },
145 { Opt_noresvport, "noresvport" },
b797cac7 146 { Opt_fscache, "fsc" },
b797cac7 147 { Opt_nofscache, "nofsc" },
bf0fd768 148
a5a16bae
CL		 149 { Opt_port, "port=%s" },
150 { Opt_rsize, "rsize=%s" },
151 { Opt_wsize, "wsize=%s" },
152 { Opt_bsize, "bsize=%s" },
153 { Opt_timeo, "timeo=%s" },
154 { Opt_retrans, "retrans=%s" },
155 { Opt_acregmin, "acregmin=%s" },
156 { Opt_acregmax, "acregmax=%s" },
157 { Opt_acdirmin, "acdirmin=%s" },
158 { Opt_acdirmax, "acdirmax=%s" },
159 { Opt_actimeo, "actimeo=%s" },
160 { Opt_namelen, "namlen=%s" },
161 { Opt_mountport, "mountport=%s" },
162 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 163 { Opt_minorversion, "minorversion=%s" },
164
a5a16bae
CL		 165 { Opt_nfsvers, "nfsvers=%s" },
166 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 167
168 { Opt_sec, "sec=%s" },
169 { Opt_proto, "proto=%s" },
170 { Opt_mountproto, "mountproto=%s" },
171 { Opt_addr, "addr=%s" },
172 { Opt_clientaddr, "clientaddr=%s" },
33832034 173 { Opt_mounthost, "mounthost=%s" },
0ac83779 174 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 175
7973c1f1 176 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 177 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 178 { Opt_local_lock, "local_lock=%s" },
7973c1f1 179
3862279a
TM		 180 /* The following needs to be listed after all other options */
181 { Opt_nfsvers, "v%s" },
182
bf0fd768
CL		 183 { Opt_err, NULL }
184};
185
186enum {
ee671b01 187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 188
189 Opt_xprt_err
190};
191
a447c093 192static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 193 { Opt_xprt_udp, "udp" },
ee671b01 194 { Opt_xprt_udp6, "udp6" },
bf0fd768 195 { Opt_xprt_tcp, "tcp" },
ee671b01 196 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 197 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 198
199 { Opt_xprt_err, NULL }
200};
201
202enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209};
210
a447c093 211static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
8d042218
OK		 224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
bf0fd768
CL		 228 { Opt_sec_err, NULL }
229};
230
7973c1f1
TM		 231enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236};
237
238static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245};
246
5eebde23
SJ		 247enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252};
253
254static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261};
262
0d71b058
TM		 263enum {
264 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
265 Opt_vers_4_1,
266
267 Opt_vers_err
268};
269
270static match_table_t nfs_vers_tokens = {
271 { Opt_vers_2, "2" },
272 { Opt_vers_3, "3" },
273 { Opt_vers_4, "4" },
274 { Opt_vers_4_0, "4.0" },
275 { Opt_vers_4_1, "4.1" },
276
277 { Opt_vers_err, NULL }
278};
bf0fd768 279
c40f8d1d
BS		 280struct nfs_mount_info {
281 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
3d176e3f 282 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
c40f8d1d 283 struct nfs_parsed_mount_data *parsed;
8c958e0c 284 struct nfs_clone_mount *cloned;
c40f8d1d
BS		 285};
286
42faad99 287static void nfs_umount_begin(struct super_block *);
816724e6 288static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 289static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 290static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 291static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 292static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 293static struct dentry *nfs_fs_mount(struct file_system_type *,
294 int, const char *, void *);
31f43471
AV		 295static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
296 int flags, const char *dev_name, void *raw_data);
387c149b 297static void nfs_put_super(struct super_block *);
f7b422b1 298static void nfs_kill_super(struct super_block *);
48b605f8 299static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 300
301static struct file_system_type nfs_fs_type = {
302 .owner = THIS_MODULE,
303 .name = "nfs",
01194981 304 .mount = nfs_fs_mount,
f7b422b1 305 .kill_sb = nfs_kill_super,
349457cc 306 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 307};
308
54ceac45 309struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 310 .owner = THIS_MODULE,
311 .name = "nfs",
31f43471 312 .mount = nfs_xdev_mount,
f7b422b1 313 .kill_sb = nfs_kill_super,
349457cc 314 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 315};
316
ee9b6d61 317static const struct super_operations nfs_sops = {
f7b422b1
DH		 318 .alloc_inode = nfs_alloc_inode,
319 .destroy_inode = nfs_destroy_inode,
320 .write_inode = nfs_write_inode,
387c149b 321 .put_super = nfs_put_super,
f7b422b1 322 .statfs = nfs_statfs,
b57922d9 323 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 324 .umount_begin = nfs_umount_begin,
325 .show_options = nfs_show_options,
c7f404b4
AV		 326 .show_devname = nfs_show_devname,
327 .show_path = nfs_show_path,
f7b422b1 328 .show_stats = nfs_show_stats,
48b605f8 329 .remount_fs = nfs_remount,
f7b422b1
DH		 330};
331
332#ifdef CONFIG_NFS_V4
7630c852
CL		 333static int nfs4_validate_text_mount_data(void *options,
334 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 335static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
336 struct nfs_parsed_mount_data *data);
337static struct dentry *nfs4_mount(struct file_system_type *fs_type,
338 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 339static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
340 int flags, const char *dev_name, void *raw_data);
341static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
342 int flags, const char *dev_name, void *raw_data);
01194981
AV		 343static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
344 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 345static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
346 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 347static void nfs4_kill_super(struct super_block *sb);
348
349static struct file_system_type nfs4_fs_type = {
350 .owner = THIS_MODULE,
351 .name = "nfs4",
01194981 352 .mount = nfs4_mount,
f7b422b1 353 .kill_sb = nfs4_kill_super,
349457cc 354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 355};
356
c02d7adf
TM		 357static struct file_system_type nfs4_remote_fs_type = {
358 .owner = THIS_MODULE,
359 .name = "nfs4",
31f43471 360 .mount = nfs4_remote_mount,
c02d7adf
TM		 361 .kill_sb = nfs4_kill_super,
362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
363};
364
54ceac45 365struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 366 .owner = THIS_MODULE,
367 .name = "nfs4",
31f43471 368 .mount = nfs4_xdev_mount,
f7b422b1 369 .kill_sb = nfs4_kill_super,
349457cc 370 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 371};
372
c02d7adf
TM		 373static struct file_system_type nfs4_remote_referral_fs_type = {
374 .owner = THIS_MODULE,
375 .name = "nfs4",
31f43471 376 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 377 .kill_sb = nfs4_kill_super,
378 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
379};
380
54ceac45 381struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 382 .owner = THIS_MODULE,
383 .name = "nfs4",
01194981 384 .mount = nfs4_referral_mount,
f7b422b1 385 .kill_sb = nfs4_kill_super,
349457cc 386 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 387};
388
ee9b6d61 389static const struct super_operations nfs4_sops = {
f7b422b1
DH		 390 .alloc_inode = nfs_alloc_inode,
391 .destroy_inode = nfs_destroy_inode,
392 .write_inode = nfs_write_inode,
387c149b 393 .put_super = nfs_put_super,
f7b422b1 394 .statfs = nfs_statfs,
b57922d9 395 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 396 .umount_begin = nfs_umount_begin,
397 .show_options = nfs_show_options,
c7f404b4
AV		 398 .show_devname = nfs_show_devname,
399 .show_path = nfs_show_path,
f7b422b1 400 .show_stats = nfs_show_stats,
48b605f8 401 .remount_fs = nfs_remount,
f7b422b1
DH		 402};
403#endif
404
8e1f936b
RR		 405static struct shrinker acl_shrinker = {
406 .shrink = nfs_access_cache_shrinker,
407 .seeks = DEFAULT_SEEKS,
408};
979df72e 409
f7b422b1
DH		 410/*
411 * Register the NFS filesystems
412 */
413int __init register_nfs_fs(void)
414{
415 int ret;
416
417 ret = register_filesystem(&nfs_fs_type);
418 if (ret < 0)
419 goto error_0;
420
f7b422b1
DH		 421 ret = nfs_register_sysctl();
422 if (ret < 0)
423 goto error_1;
89a09141 424#ifdef CONFIG_NFS_V4
f7b422b1
DH		 425 ret = register_filesystem(&nfs4_fs_type);
426 if (ret < 0)
427 goto error_2;
428#endif
8e1f936b 429 register_shrinker(&acl_shrinker);
f7b422b1
DH		 430 return 0;
431
432#ifdef CONFIG_NFS_V4
433error_2:
434 nfs_unregister_sysctl();
89a09141 435#endif
f7b422b1
DH		 436error_1:
437 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 438error_0:
439 return ret;
440}
441
442/*
443 * Unregister the NFS filesystems
444 */
445void __exit unregister_nfs_fs(void)
446{
8e1f936b 447 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 448#ifdef CONFIG_NFS_V4
449 unregister_filesystem(&nfs4_fs_type);
f7b422b1 450#endif
49af7ee1 451 nfs_unregister_sysctl();
f7b422b1
DH		 452 unregister_filesystem(&nfs_fs_type);
453}
454
1daef0a8 455void nfs_sb_active(struct super_block *sb)
ef818a28 456{
1daef0a8 457 struct nfs_server *server = NFS_SB(sb);
ef818a28 458
1daef0a8
TM		 459 if (atomic_inc_return(&server->active) == 1)
460 atomic_inc(&sb->s_active);
ef818a28
SD		 461}
462
1daef0a8 463void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 464{
465 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 466
467 if (atomic_dec_and_test(&server->active))
468 deactivate_super(sb);
ef818a28
SD		 469}
470
f7b422b1
DH		 471/*
472 * Deliver file system statistics to userspace
473 */
816724e6 474static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 475{
0c7d90cf 476 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 477 unsigned char blockbits;
478 unsigned long blockres;
0c7d90cf 479 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 480 struct nfs_fsstat res;
481 int error = -ENOMEM;
482
483 res.fattr = nfs_alloc_fattr();
484 if (res.fattr == NULL)
485 goto out_err;
f7b422b1 486
8fa5c000 487 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 488 if (unlikely(error == -ESTALE)) {
489 struct dentry *pd_dentry;
490
491 pd_dentry = dget_parent(dentry);
492 if (pd_dentry != NULL) {
493 nfs_zap_caches(pd_dentry->d_inode);
494 dput(pd_dentry);
495 }
496 }
ca7e9a0d 497 nfs_free_fattr(res.fattr);
f7b422b1
DH		 498 if (error < 0)
499 goto out_err;
ca7e9a0d 500
1a0ba9ae 501 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 502
503 /*
504 * Current versions of glibc do not correctly handle the
505 * case where f_frsize != f_bsize. Eventually we want to
506 * report the value of wtmult in this field.
507 */
0c7d90cf 508 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 509
510 /*
511 * On most *nix systems, f_blocks, f_bfree, and f_bavail
512 * are reported in units of f_frsize. Linux hasn't had
513 * an f_frsize field in its statfs struct until recently,
514 * thus historically Linux's sys_statfs reports these
515 * fields in units of f_bsize.
516 */
0c7d90cf
DH		 517 buf->f_bsize = dentry->d_sb->s_blocksize;
518 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 519 blockres = (1 << blockbits) - 1;
520 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
521 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
522 buf->f_bavail = (res.abytes + blockres) >> blockbits;
523
524 buf->f_files = res.tfiles;
525 buf->f_ffree = res.afiles;
526
527 buf->f_namelen = server->namelen;
1a0ba9ae 528
f7b422b1
DH		 529 return 0;
530
531 out_err:
3110ff80 532 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 533 return error;
f7b422b1
DH		 534}
535
7d4e2747
DH		 536/*
537 * Map the security flavour number to a name
538 */
81039f1f
TM		 539static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
540{
7d4e2747 541 static const struct {
81039f1f
TM		 542 rpc_authflavor_t flavour;
543 const char *str;
544 } sec_flavours[] = {
545 { RPC_AUTH_NULL, "null" },
546 { RPC_AUTH_UNIX, "sys" },
547 { RPC_AUTH_GSS_KRB5, "krb5" },
548 { RPC_AUTH_GSS_KRB5I, "krb5i" },
549 { RPC_AUTH_GSS_KRB5P, "krb5p" },
550 { RPC_AUTH_GSS_LKEY, "lkey" },
551 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
552 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
553 { RPC_AUTH_GSS_SPKM, "spkm" },
554 { RPC_AUTH_GSS_SPKMI, "spkmi" },
555 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 556 { UINT_MAX, "unknown" }
81039f1f
TM		 557 };
558 int i;
559
4d81cd16 560 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 561 if (sec_flavours[i].flavour == flavour)
562 break;
563 }
564 return sec_flavours[i].str;
565}
566
ee671b01
JL		 567static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
568 int showdefaults)
569{
570 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
571
572 seq_printf(m, ",mountproto=");
573 switch (sap->sa_family) {
574 case AF_INET:
575 switch (nfss->mountd_protocol) {
576 case IPPROTO_UDP:
577 seq_printf(m, RPCBIND_NETID_UDP);
578 break;
579 case IPPROTO_TCP:
580 seq_printf(m, RPCBIND_NETID_TCP);
581 break;
582 default:
583 if (showdefaults)
584 seq_printf(m, "auto");
585 }
586 break;
587 case AF_INET6:
588 switch (nfss->mountd_protocol) {
589 case IPPROTO_UDP:
590 seq_printf(m, RPCBIND_NETID_UDP6);
591 break;
592 case IPPROTO_TCP:
593 seq_printf(m, RPCBIND_NETID_TCP6);
594 break;
595 default:
596 if (showdefaults)
597 seq_printf(m, "auto");
598 }
599 break;
600 default:
601 if (showdefaults)
602 seq_printf(m, "auto");
603 }
604}
605
82d101d5
CL		 606static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
607 int showdefaults)
608{
609 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
610
d5eff1a3
BS		 611 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
612 return;
613
82d101d5
CL		 614 switch (sap->sa_family) {
615 case AF_INET: {
616 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 617 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 618 break;
619 }
620 case AF_INET6: {
621 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 622 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 623 break;
624 }
625 default:
626 if (showdefaults)
627 seq_printf(m, ",mountaddr=unspecified");
628 }
629
630 if (nfss->mountd_version || showdefaults)
631 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 632 if ((nfss->mountd_port &&
633 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
634 showdefaults)
82d101d5
CL		 635 seq_printf(m, ",mountport=%u", nfss->mountd_port);
636
ee671b01 637 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 638}
639
0be8189f
TM		 640#ifdef CONFIG_NFS_V4
641static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
642 int showdefaults)
643{
644 struct nfs_client *clp = nfss->nfs_client;
645
646 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 647}
648#else
649static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
650 int showdefaults)
651{
652}
653#endif
654
7bbceb6f
TM		 655static void nfs_show_nfs_version(struct seq_file *m,
656 unsigned int version,
657 unsigned int minorversion)
658{
659 seq_printf(m, ",vers=%u", version);
660 if (version == 4)
661 seq_printf(m, ".%u", minorversion);
662}
663
f7b422b1
DH		 664/*
665 * Describe the mount options in force on this server representation
666 */
82d101d5
CL		 667static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
668 int showdefaults)
f7b422b1 669{
509de811 670 static const struct proc_nfs_info {
f7b422b1 671 int flag;
509de811
DH		 672 const char *str;
673 const char *nostr;
f7b422b1
DH		 674 } nfs_info[] = {
675 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 676 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 677 { NFS_MOUNT_NOCTO, ",nocto", "" },
678 { NFS_MOUNT_NOAC, ",noac", "" },
679 { NFS_MOUNT_NONLM, ",nolock", "" },
680 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 681 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 682 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
683 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 684 { 0, NULL, NULL }
685 };
509de811 686 const struct proc_nfs_info *nfs_infop;
8fa5c000 687 struct nfs_client *clp = nfss->nfs_client;
82d101d5 688 u32 version = clp->rpc_ops->version;
7c563cc9 689 int local_flock, local_fcntl;
f7b422b1 690
7bbceb6f 691 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 692 seq_printf(m, ",rsize=%u", nfss->rsize);
693 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 694 if (nfss->bsize != 0)
695 seq_printf(m, ",bsize=%u", nfss->bsize);
696 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 697 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 698 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 699 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 700 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 701 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 702 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 703 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 704 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 705 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
706 if (nfss->flags & nfs_infop->flag)
707 seq_puts(m, nfs_infop->str);
708 else
709 seq_puts(m, nfs_infop->nostr);
710 }
2446ab60 711 rcu_read_lock();
56928edd 712 seq_printf(m, ",proto=%s",
ee671b01 713 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 714 rcu_read_unlock();
82d101d5
CL		 715 if (version == 4) {
716 if (nfss->port != NFS_PORT)
717 seq_printf(m, ",port=%u", nfss->port);
718 } else
719 if (nfss->port)
720 seq_printf(m, ",port=%u", nfss->port);
721
33170233
TM		 722 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
723 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 724 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 725
726 if (version != 4)
727 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 728 else
729 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 730
b797cac7
DH		 731 if (nfss->options & NFS_OPTION_FSCACHE)
732 seq_printf(m, ",fsc");
9b00c643
PL		 733
734 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
735 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
736 seq_printf(m, ",lookupcache=none");
737 else
738 seq_printf(m, ",lookupcache=pos");
739 }
7c563cc9
SJ		 740
741 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
742 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
743
744 if (!local_flock && !local_fcntl)
745 seq_printf(m, ",local_lock=none");
746 else if (local_flock && local_fcntl)
747 seq_printf(m, ",local_lock=all");
748 else if (local_flock)
749 seq_printf(m, ",local_lock=flock");
750 else
751 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 752}
753
754/*
755 * Describe the mount options on this VFS mountpoint
756 */
34c80b1d 757static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 758{
34c80b1d 759 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 760
761 nfs_show_mount_options(m, nfss, 0);
762
2446ab60 763 rcu_read_lock();
5d8515ca
CL		 764 seq_printf(m, ",addr=%s",
765 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
766 RPC_DISPLAY_ADDR));
2446ab60 767 rcu_read_unlock();
f7b422b1
DH		 768
769 return 0;
770}
45402c38
HS		 771
772#ifdef CONFIG_NFS_V4
ae50c0b5 773#ifdef CONFIG_NFS_V4_1
45402c38 774static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 775{
776 if (nfs4_has_session(server->nfs_client))
777 seq_printf(m, ",sessions");
778}
779#else
45402c38
HS		 780static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
781#endif
ae50c0b5
BF		 782#endif
783
784#ifdef CONFIG_NFS_V4_1
45402c38 785static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 786{
787 seq_printf(m, ",pnfs=");
788 if (server->pnfs_curr_ld)
789 seq_printf(m, "%s", server->pnfs_curr_ld->name);
790 else
791 seq_printf(m, "not configured");
792}
7e03b7cc
TM		 793
794static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
795{
796 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
797 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
798 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
799 "date='%llu,%u'",
800 impl_id->name, impl_id->domain,
801 impl_id->date.seconds, impl_id->date.nseconds);
802 }
803}
45402c38 804#else
7e03b7cc
TM		 805#ifdef CONFIG_NFS_V4
806static void show_pnfs(struct seq_file *m, struct nfs_server *server)
807{
808}
45402c38 809#endif
7e03b7cc
TM		 810static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
811{
812}
45402c38 813#endif
f7b422b1 814
d861c630 815static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 816{
817 char *page = (char *) __get_free_page(GFP_KERNEL);
818 char *devname, *dummy;
819 int err = 0;
820 if (!page)
821 return -ENOMEM;
d861c630 822 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 823 if (IS_ERR(devname))
824 err = PTR_ERR(devname);
825 else
826 seq_escape(m, devname, " \t\n\\");
827 free_page((unsigned long)page);
828 return err;
829}
830
a6322de6 831static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 832{
833 seq_puts(m, "/");
834 return 0;
835}
836
f7b422b1
DH		 837/*
838 * Present statistical information for this VFS mountpoint
839 */
64132379 840static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 841{
842 int i, cpu;
64132379 843 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 844 struct rpc_auth *auth = nfss->client->cl_auth;
845 struct nfs_iostats totals = { };
846
847 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
848
849 /*
850 * Display all mount option settings
851 */
852 seq_printf(m, "\n\topts:\t");
64132379
AV		 853 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
854 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
855 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
856 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 857 nfs_show_mount_options(m, nfss, 1);
858
859 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
860
7e03b7cc 861 show_implementation_id(m, nfss);
7d2ed9ac 862
f7b422b1
DH		 863 seq_printf(m, "\n\tcaps:\t");
864 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 865 seq_printf(m, ",wtmult=%u", nfss->wtmult);
866 seq_printf(m, ",dtsize=%u", nfss->dtsize);
867 seq_printf(m, ",bsize=%u", nfss->bsize);
868 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 869
870#ifdef CONFIG_NFS_V4
40c55319 871 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 872 seq_printf(m, "\n\tnfsv4:\t");
873 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
874 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
875 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 876 show_sessions(m, nfss);
877 show_pnfs(m, nfss);
f7b422b1
DH		 878 }
879#endif
880
881 /*
882 * Display security flavor in effect for this mount
883 */
2d767432 884 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 885 if (auth->au_flavor)
2d767432 886 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 887
888 /*
889 * Display superblock I/O counters
890 */
891 for_each_possible_cpu(cpu) {
892 struct nfs_iostats *stats;
893
894 preempt_disable();
895 stats = per_cpu_ptr(nfss->io_stats, cpu);
896
897 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
898 totals.events[i] += stats->events[i];
899 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
900 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 901#ifdef CONFIG_NFS_FSCACHE
902 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
903 totals.fscache[i] += stats->fscache[i];
904#endif
f7b422b1
DH		 905
906 preempt_enable();
907 }
908
909 seq_printf(m, "\n\tevents:\t");
910 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
911 seq_printf(m, "%lu ", totals.events[i]);
912 seq_printf(m, "\n\tbytes:\t");
913 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
914 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 915#ifdef CONFIG_NFS_FSCACHE
916 if (nfss->options & NFS_OPTION_FSCACHE) {
917 seq_printf(m, "\n\tfsc:\t");
918 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
919 seq_printf(m, "%Lu ", totals.bytes[i]);
920 }
921#endif
f7b422b1
DH		 922 seq_printf(m, "\n");
923
924 rpc_print_iostats(m, nfss->client);
925
926 return 0;
927}
928
929/*
930 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 931 * in response to xdev traversals and referrals
f7b422b1 932 */
42faad99 933static void nfs_umount_begin(struct super_block *sb)
f7b422b1 934{
67e55205 935 struct nfs_server *server;
fc6ae3cf
TM		 936 struct rpc_clnt *rpc;
937
67e55205 938 server = NFS_SB(sb);
fc6ae3cf
TM		 939 /* -EIO all pending I/O */
940 rpc = server->client_acl;
941 if (!IS_ERR(rpc))
942 rpc_killall_tasks(rpc);
943 rpc = server->client;
944 if (!IS_ERR(rpc))
945 rpc_killall_tasks(rpc);
f7b422b1
DH		 946}
947
db833351 948static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 949{
950 struct nfs_parsed_mount_data *data;
951
952 data = kzalloc(sizeof(*data), GFP_KERNEL);
953 if (data) {
9423a08a
CL		 954 data->acregmin = NFS_DEF_ACREGMIN;
955 data->acregmax = NFS_DEF_ACREGMAX;
956 data->acdirmin = NFS_DEF_ACDIRMIN;
957 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 958 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 959 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 960 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 961 data->auth_flavors[0] = RPC_AUTH_UNIX;
962 data->auth_flavor_len = 1;
963 data->minorversion = 0;
9937347a 964 data->net = current->nsproxy->net_ns;
8a0d551a 965 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 966 }
967 return data;
968}
969
8a0d551a
JL		 970static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
971{
972 if (data) {
973 kfree(data->client_address);
974 kfree(data->mount_server.hostname);
975 kfree(data->nfs_server.export_path);
976 kfree(data->nfs_server.hostname);
977 kfree(data->fscache_uniq);
978 security_free_mnt_opts(&data->lsm_opts);
979 kfree(data);
980 }
981}
982
fc50d58f 983/*
cdcd7f9a
CL		 984 * Sanity-check a server address provided by the mount command.
985 *
986 * Address family must be initialized, and address must not be
987 * the ANY address for that family.
fc50d58f
CL		 988 */
989static int nfs_verify_server_address(struct sockaddr *addr)
990{
991 switch (addr->sa_family) {
992 case AF_INET: {
cdcd7f9a 993 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 994 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 995 }
996 case AF_INET6: {
997 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
998 return !ipv6_addr_any(sa);
fc50d58f
CL		 999 }
1000 }
1001
53a0b9c4 1002 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 1003 return 0;
1004}
1005
4cfd74fc
CL		 1006/*
1007 * Select between a default port value and a user-specified port value.
1008 * If a zero value is set, then autobind will be used.
1009 */
f5855fec 1010static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1011 const unsigned short default_port)
1012{
f5855fec
TM		 1013 if (*port == NFS_UNSPEC_PORT)
1014 *port = default_port;
4cfd74fc 1015
f5855fec 1016 rpc_set_port(sap, *port);
4cfd74fc
CL		 1017}
1018
259875ef
TM		 1019/*
1020 * Sanity check the NFS transport protocol.
1021 *
1022 */
1023static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1024{
1025 switch (mnt->nfs_server.protocol) {
1026 case XPRT_TRANSPORT_UDP:
1027 case XPRT_TRANSPORT_TCP:
1028 case XPRT_TRANSPORT_RDMA:
1029 break;
1030 default:
1031 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1032 }
1033}
1034
1035/*
1036 * For text based NFSv2/v3 mounts, the mount protocol transport default
1037 * settings should depend upon the specified NFS transport.
1038 */
1039static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1040{
1041 nfs_validate_transport_protocol(mnt);
1042
1043 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1044 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1045 return;
1046 switch (mnt->nfs_server.protocol) {
1047 case XPRT_TRANSPORT_UDP:
1048 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1049 break;
1050 case XPRT_TRANSPORT_TCP:
1051 case XPRT_TRANSPORT_RDMA:
1052 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1053 }
1054}
1055
01060c89
CL		 1056/*
1057 * Parse the value of the 'sec=' option.
01060c89
CL		 1058 */
1059static int nfs_parse_security_flavors(char *value,
1060 struct nfs_parsed_mount_data *mnt)
1061{
1062 substring_t args[MAX_OPT_ARGS];
1063
1064 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1065
1066 switch (match_token(value, nfs_secflavor_tokens, args)) {
1067 case Opt_sec_none:
01060c89
CL		 1068 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1069 break;
1070 case Opt_sec_sys:
01060c89
CL		 1071 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1072 break;
1073 case Opt_sec_krb5:
01060c89
CL		 1074 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1075 break;
1076 case Opt_sec_krb5i:
01060c89
CL		 1077 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1078 break;
1079 case Opt_sec_krb5p:
01060c89
CL		 1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1081 break;
1082 case Opt_sec_lkey:
01060c89
CL		 1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1084 break;
1085 case Opt_sec_lkeyi:
01060c89
CL		 1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1087 break;
1088 case Opt_sec_lkeyp:
01060c89
CL		 1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1090 break;
1091 case Opt_sec_spkm:
01060c89
CL		 1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1093 break;
1094 case Opt_sec_spkmi:
01060c89
CL		 1095 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1096 break;
1097 case Opt_sec_spkmp:
01060c89
CL		 1098 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1099 break;
1100 default:
1101 return 0;
1102 }
1103
9b7160c5 1104 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1105 mnt->auth_flavor_len = 1;
01060c89
CL		 1106 return 1;
1107}
1108
0d71b058
TM		 1109static int nfs_parse_version_string(char *string,
1110 struct nfs_parsed_mount_data *mnt,
1111 substring_t *args)
1112{
1113 mnt->flags &= ~NFS_MOUNT_VER3;
1114 switch (match_token(string, nfs_vers_tokens, args)) {
1115 case Opt_vers_2:
1116 mnt->version = 2;
1117 break;
1118 case Opt_vers_3:
1119 mnt->flags |= NFS_MOUNT_VER3;
1120 mnt->version = 3;
1121 break;
1122 case Opt_vers_4:
1123 /* Backward compatibility option. In future,
1124 * the mount program should always supply
1125 * a NFSv4 minor version number.
1126 */
1127 mnt->version = 4;
1128 break;
1129 case Opt_vers_4_0:
1130 mnt->version = 4;
1131 mnt->minorversion = 0;
1132 break;
1133 case Opt_vers_4_1:
1134 mnt->version = 4;
1135 mnt->minorversion = 1;
1136 break;
1137 default:
1138 return 0;
1139 }
1140 return 1;
1141}
1142
c5cb09b6
RL		 1143static int nfs_get_option_str(substring_t args[], char **option)
1144{
1145 kfree(*option);
1146 *option = match_strdup(args);
1147 return !option;
1148}
1149
1150static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1151{
1152 int rc;
1153 char *string;
1154
1155 string = match_strdup(args);
1156 if (string == NULL)
1157 return -ENOMEM;
1158 rc = strict_strtoul(string, 10, option);
1159 kfree(string);
1160
1161 return rc;
1162}
1163
bf0fd768
CL		 1164/*
1165 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1166 * a data structure. The whole mount string is processed; bad options are
1167 * skipped as they are encountered. If there were no errors, return 1;
1168 * otherwise return 0 (zero).
bf0fd768
CL		 1169 */
1170static int nfs_parse_mount_options(char *raw,
1171 struct nfs_parsed_mount_data *mnt)
1172{
f9c3a380 1173 char *p, *string, *secdata;
d23c45fd 1174 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1175 unsigned short protofamily = AF_UNSPEC;
1176 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1177
1178 if (!raw) {
1179 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1180 return 1;
1181 }
1182 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1183
f9c3a380
EP		 1184 secdata = alloc_secdata();
1185 if (!secdata)
1186 goto out_nomem;
1187
1188 rc = security_sb_copy_data(raw, secdata);
1189 if (rc)
1190 goto out_security_failure;
1191
1192 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1193 if (rc)
1194 goto out_security_failure;
1195
1196 free_secdata(secdata);
1197
bf0fd768
CL		 1198 while ((p = strsep(&raw, ",")) != NULL) {
1199 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1200 unsigned long option;
1201 int token;
bf0fd768
CL		 1202
1203 if (!*p)
1204 continue;
1205
1206 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1207
1208 token = match_token(p, nfs_mount_option_tokens, args);
1209 switch (token) {
f45663ce
CL		 1210
1211 /*
1212 * boolean options: foo/nofoo
1213 */
bf0fd768
CL		 1214 case Opt_soft:
1215 mnt->flags |= NFS_MOUNT_SOFT;
1216 break;
1217 case Opt_hard:
1218 mnt->flags &= ~NFS_MOUNT_SOFT;
1219 break;
bf0fd768
CL		 1220 case Opt_posix:
1221 mnt->flags |= NFS_MOUNT_POSIX;
1222 break;
1223 case Opt_noposix:
1224 mnt->flags &= ~NFS_MOUNT_POSIX;
1225 break;
1226 case Opt_cto:
1227 mnt->flags &= ~NFS_MOUNT_NOCTO;
1228 break;
1229 case Opt_nocto:
1230 mnt->flags |= NFS_MOUNT_NOCTO;
1231 break;
1232 case Opt_ac:
1233 mnt->flags &= ~NFS_MOUNT_NOAC;
1234 break;
1235 case Opt_noac:
1236 mnt->flags |= NFS_MOUNT_NOAC;
1237 break;
1238 case Opt_lock:
1239 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1240 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1241 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1242 break;
1243 case Opt_nolock:
1244 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1245 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1246 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1247 break;
bf0fd768
CL		 1248 case Opt_udp:
1249 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1250 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1251 break;
1252 case Opt_tcp:
1253 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1254 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1255 break;
2cf7ff7a
TT		 1256 case Opt_rdma:
1257 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1259 xprt_load_transport(p);
2cf7ff7a 1260 break;
bf0fd768
CL		 1261 case Opt_acl:
1262 mnt->flags &= ~NFS_MOUNT_NOACL;
1263 break;
1264 case Opt_noacl:
1265 mnt->flags |= NFS_MOUNT_NOACL;
1266 break;
1267 case Opt_rdirplus:
1268 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1269 break;
1270 case Opt_nordirplus:
1271 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1272 break;
75180df2
TM		 1273 case Opt_sharecache:
1274 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1275 break;
1276 case Opt_nosharecache:
1277 mnt->flags |= NFS_MOUNT_UNSHARED;
1278 break;
d740351b
CL		 1279 case Opt_resvport:
1280 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1281 break;
1282 case Opt_noresvport:
1283 mnt->flags |= NFS_MOUNT_NORESVPORT;
1284 break;
b797cac7
DH		 1285 case Opt_fscache:
1286 mnt->options |= NFS_OPTION_FSCACHE;
1287 kfree(mnt->fscache_uniq);
1288 mnt->fscache_uniq = NULL;
1289 break;
1290 case Opt_nofscache:
1291 mnt->options &= ~NFS_OPTION_FSCACHE;
1292 kfree(mnt->fscache_uniq);
1293 mnt->fscache_uniq = NULL;
1294 break;
bf0fd768 1295
f45663ce
CL		 1296 /*
1297 * options that take numeric values
1298 */
bf0fd768 1299 case Opt_port:
c5cb09b6
RL		 1300 if (nfs_get_option_ul(args, &option) ||
1301 option > USHRT_MAX)
d23c45fd
CL		 1302 goto out_invalid_value;
1303 mnt->nfs_server.port = option;
bf0fd768
CL		 1304 break;
1305 case Opt_rsize:
c5cb09b6 1306 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1307 goto out_invalid_value;
1308 mnt->rsize = option;
bf0fd768
CL		 1309 break;
1310 case Opt_wsize:
c5cb09b6 1311 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1312 goto out_invalid_value;
1313 mnt->wsize = option;
bf0fd768
CL		 1314 break;
1315 case Opt_bsize:
c5cb09b6 1316 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1317 goto out_invalid_value;
1318 mnt->bsize = option;
bf0fd768
CL		 1319 break;
1320 case Opt_timeo:
c5cb09b6 1321 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1322 goto out_invalid_value;
1323 mnt->timeo = option;
bf0fd768
CL		 1324 break;
1325 case Opt_retrans:
c5cb09b6 1326 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1327 goto out_invalid_value;
1328 mnt->retrans = option;
bf0fd768
CL		 1329 break;
1330 case Opt_acregmin:
c5cb09b6 1331 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1332 goto out_invalid_value;
1333 mnt->acregmin = option;
bf0fd768
CL		 1334 break;
1335 case Opt_acregmax:
c5cb09b6 1336 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1337 goto out_invalid_value;
1338 mnt->acregmax = option;
bf0fd768
CL		 1339 break;
1340 case Opt_acdirmin:
c5cb09b6 1341 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1342 goto out_invalid_value;
1343 mnt->acdirmin = option;
bf0fd768
CL		 1344 break;
1345 case Opt_acdirmax:
c5cb09b6 1346 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1347 goto out_invalid_value;
1348 mnt->acdirmax = option;
bf0fd768
CL		 1349 break;
1350 case Opt_actimeo:
c5cb09b6 1351 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1352 goto out_invalid_value;
1353 mnt->acregmin = mnt->acregmax =
1354 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1355 break;
1356 case Opt_namelen:
c5cb09b6 1357 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1358 goto out_invalid_value;
1359 mnt->namlen = option;
bf0fd768
CL		 1360 break;
1361 case Opt_mountport:
c5cb09b6
RL		 1362 if (nfs_get_option_ul(args, &option) ||
1363 option > USHRT_MAX)
d23c45fd
CL		 1364 goto out_invalid_value;
1365 mnt->mount_server.port = option;
bf0fd768 1366 break;
bf0fd768 1367 case Opt_mountvers:
c5cb09b6 1368 if (nfs_get_option_ul(args, &option) ||
f45663ce 1369 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1370 option > NFS_MNT3_VERSION)
1371 goto out_invalid_value;
1372 mnt->mount_server.version = option;
bf0fd768 1373 break;
3fd5be9e 1374 case Opt_minorversion:
c5cb09b6 1375 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1376 goto out_invalid_value;
1377 if (option > NFS4_MAX_MINOR_VERSION)
1378 goto out_invalid_value;
1379 mnt->minorversion = option;
3fd5be9e 1380 break;
bf0fd768 1381
f45663ce
CL		 1382 /*
1383 * options that take text values
1384 */
0d71b058
TM		 1385 case Opt_nfsvers:
1386 string = match_strdup(args);
1387 if (string == NULL)
1388 goto out_nomem;
1389 rc = nfs_parse_version_string(string, mnt, args);
1390 kfree(string);
1391 if (!rc)
1392 goto out_invalid_value;
1393 break;
bf0fd768
CL		 1394 case Opt_sec:
1395 string = match_strdup(args);
1396 if (string == NULL)
1397 goto out_nomem;
01060c89 1398 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1399 kfree(string);
f45663ce 1400 if (!rc) {
f45663ce
CL		 1401 dfprintk(MOUNT, "NFS: unrecognized "
1402 "security flavor\n");
d23c45fd 1403 return 0;
f45663ce 1404 }
bf0fd768
CL		 1405 break;
1406 case Opt_proto:
1407 string = match_strdup(args);
1408 if (string == NULL)
1409 goto out_nomem;
1410 token = match_token(string,
1411 nfs_xprt_protocol_tokens, args);
bf0fd768 1412
ee671b01 1413 protofamily = AF_INET;
bf0fd768 1414 switch (token) {
ee671b01
JL		 1415 case Opt_xprt_udp6:
1416 protofamily = AF_INET6;
fdb66ff4 1417 case Opt_xprt_udp:
bf0fd768 1418 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1419 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1420 break;
ee671b01
JL		 1421 case Opt_xprt_tcp6:
1422 protofamily = AF_INET6;
fdb66ff4 1423 case Opt_xprt_tcp:
bf0fd768 1424 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1425 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1426 break;
2cf7ff7a
TT		 1427 case Opt_xprt_rdma:
1428 /* vector side protocols to TCP */
1429 mnt->flags |= NFS_MOUNT_TCP;
1430 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1431 xprt_load_transport(string);
2cf7ff7a 1432 break;
bf0fd768 1433 default:
f45663ce
CL		 1434 dfprintk(MOUNT, "NFS: unrecognized "
1435 "transport protocol\n");
4223a4a1 1436 kfree(string);
d23c45fd 1437 return 0;
bf0fd768 1438 }
c5cb09b6 1439 kfree(string);
bf0fd768
CL		 1440 break;
1441 case Opt_mountproto:
1442 string = match_strdup(args);
1443 if (string == NULL)
1444 goto out_nomem;
1445 token = match_token(string,
1446 nfs_xprt_protocol_tokens, args);
d508afb4 1447 kfree(string);
bf0fd768 1448
ee671b01 1449 mountfamily = AF_INET;
bf0fd768 1450 switch (token) {
ee671b01
JL		 1451 case Opt_xprt_udp6:
1452 mountfamily = AF_INET6;
fdb66ff4 1453 case Opt_xprt_udp:
0896a725 1454 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1455 break;
ee671b01
JL		 1456 case Opt_xprt_tcp6:
1457 mountfamily = AF_INET6;
fdb66ff4 1458 case Opt_xprt_tcp:
0896a725 1459 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1460 break;
2cf7ff7a 1461 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1462 default:
f45663ce
CL		 1463 dfprintk(MOUNT, "NFS: unrecognized "
1464 "transport protocol\n");
d23c45fd 1465 return 0;
bf0fd768
CL		 1466 }
1467 break;
1468 case Opt_addr:
1469 string = match_strdup(args);
1470 if (string == NULL)
1471 goto out_nomem;
53a0b9c4 1472 mnt->nfs_server.addrlen =
b48e1278 1473 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1474 (struct sockaddr *)
1475 &mnt->nfs_server.address,
1476 sizeof(mnt->nfs_server.address));
bf0fd768 1477 kfree(string);
53a0b9c4
CL		 1478 if (mnt->nfs_server.addrlen == 0)
1479 goto out_invalid_address;
bf0fd768
CL		 1480 break;
1481 case Opt_clientaddr:
c5cb09b6 1482 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1483 goto out_nomem;
bf0fd768 1484 break;
33832034 1485 case Opt_mounthost:
c5cb09b6
RL		 1486 if (nfs_get_option_str(args,
1487 &mnt->mount_server.hostname))
33832034 1488 goto out_nomem;
33832034 1489 break;
0ac83779 1490 case Opt_mountaddr:
bf0fd768
CL		 1491 string = match_strdup(args);
1492 if (string == NULL)
1493 goto out_nomem;
53a0b9c4 1494 mnt->mount_server.addrlen =
b48e1278 1495 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1496 (struct sockaddr *)
1497 &mnt->mount_server.address,
1498 sizeof(mnt->mount_server.address));
bf0fd768 1499 kfree(string);
53a0b9c4
CL		 1500 if (mnt->mount_server.addrlen == 0)
1501 goto out_invalid_address;
bf0fd768 1502 break;
7973c1f1
TM		 1503 case Opt_lookupcache:
1504 string = match_strdup(args);
1505 if (string == NULL)
1506 goto out_nomem;
1507 token = match_token(string,
1508 nfs_lookupcache_tokens, args);
1509 kfree(string);
1510 switch (token) {
1511 case Opt_lookupcache_all:
1512 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1513 break;
1514 case Opt_lookupcache_positive:
1515 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1516 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1517 break;
1518 case Opt_lookupcache_none:
1519 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1520 break;
1521 default:
7973c1f1
TM		 1522 dfprintk(MOUNT, "NFS: invalid "
1523 "lookupcache argument\n");
d23c45fd 1524 return 0;
7973c1f1
TM		 1525 };
1526 break;
a6d5ff64 1527 case Opt_fscache_uniq:
c5cb09b6 1528 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1529 goto out_nomem;
a6d5ff64
CL		 1530 mnt->options |= NFS_OPTION_FSCACHE;
1531 break;
5eebde23
SJ		 1532 case Opt_local_lock:
1533 string = match_strdup(args);
1534 if (string == NULL)
1535 goto out_nomem;
1536 token = match_token(string, nfs_local_lock_tokens,
1537 args);
1538 kfree(string);
1539 switch (token) {
1540 case Opt_local_lock_all:
1541 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1542 NFS_MOUNT_LOCAL_FCNTL);
1543 break;
1544 case Opt_local_lock_flock:
1545 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1546 break;
1547 case Opt_local_lock_posix:
1548 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1549 break;
1550 case Opt_local_lock_none:
1551 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1552 NFS_MOUNT_LOCAL_FCNTL);
1553 break;
1554 default:
1555 dfprintk(MOUNT, "NFS: invalid "
1556 "local_lock argument\n");
1557 return 0;
1558 };
1559 break;
bf0fd768 1560
f45663ce
CL		 1561 /*
1562 * Special options
1563 */
1564 case Opt_sloppy:
1565 sloppy = 1;
1566 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1567 break;
bf0fd768
CL		 1568 case Opt_userspace:
1569 case Opt_deprecated:
d33e4dfe
CL		 1570 dfprintk(MOUNT, "NFS: ignoring mount option "
1571 "'%s'\n", p);
bf0fd768
CL		 1572 break;
1573
1574 default:
d23c45fd 1575 invalid_option = 1;
f45663ce
CL		 1576 dfprintk(MOUNT, "NFS: unrecognized mount option "
1577 "'%s'\n", p);
bf0fd768
CL		 1578 }
1579 }
1580
d23c45fd
CL		 1581 if (!sloppy && invalid_option)
1582 return 0;
1583
571b7554
WAA		 1584 if (mnt->minorversion && mnt->version != 4)
1585 goto out_minorversion_mismatch;
1586
ee671b01
JL		 1587 /*
1588 * verify that any proto=/mountproto= options match the address
1589 * familiies in the addr=/mountaddr= options.
1590 */
1591 if (protofamily != AF_UNSPEC &&
1592 protofamily != mnt->nfs_server.address.ss_family)
1593 goto out_proto_mismatch;
1594
1595 if (mountfamily != AF_UNSPEC) {
1596 if (mnt->mount_server.addrlen) {
1597 if (mountfamily != mnt->mount_server.address.ss_family)
1598 goto out_mountproto_mismatch;
1599 } else {
1600 if (mountfamily != mnt->nfs_server.address.ss_family)
1601 goto out_mountproto_mismatch;
1602 }
1603 }
1604
bf0fd768
CL		 1605 return 1;
1606
ee671b01
JL		 1607out_mountproto_mismatch:
1608 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1609 "option\n");
1610 return 0;
1611out_proto_mismatch:
1612 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1613 return 0;
53a0b9c4
CL		 1614out_invalid_address:
1615 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1616 return 0;
d23c45fd 1617out_invalid_value:
53a0b9c4 1618 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1619 return 0;
571b7554
WAA		 1620out_minorversion_mismatch:
1621 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1622 "minorversion=%u\n", mnt->version, mnt->minorversion);
1623 return 0;
bf0fd768
CL		 1624out_nomem:
1625 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1626 return 0;
f9c3a380
EP		 1627out_security_failure:
1628 free_secdata(secdata);
1629 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1630 return 0;
bf0fd768
CL		 1631}
1632
ec88f28d
CL		 1633/*
1634 * Match the requested auth flavors with the list returned by
1635 * the server. Returns zero and sets the mount's authentication
1636 * flavor on success; returns -EACCES if server does not support
1637 * the requested flavor.
1638 */
1639static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1640 struct nfs_mount_request *request)
1641{
1642 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1643
5eecfde6
CL		 1644 /*
1645 * Certain releases of Linux's mountd return an empty
1646 * flavor list. To prevent behavioral regression with
1647 * these servers (ie. rejecting mounts that used to
1648 * succeed), revert to pre-2.6.32 behavior (no checking)
1649 * if the returned flavor list is empty.
1650 */
1651 if (server_authlist_len == 0)
1652 return 0;
1653
ec88f28d
CL		 1654 /*
1655 * We avoid sophisticated negotiating here, as there are
1656 * plenty of cases where we can get it wrong, providing
1657 * either too little or too much security.
1658 *
1659 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1660 * flavor listed first. However, some servers list
1661 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1662 * preferred default, in args->auth_flavors[0] if user
1663 * didn't specify sec= mount option.
1664 */
1665 for (i = 0; i < args->auth_flavor_len; i++)
1666 for (j = 0; j < server_authlist_len; j++)
1667 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1668 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1669 request->auth_flavs[j]);
1670 args->auth_flavors[0] = request->auth_flavs[j];
1671 return 0;
1672 }
1673
1674 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1675 nfs_umount(request);
1676 return -EACCES;
1677}
1678
0076d7b7
CL		 1679/*
1680 * Use the remote server's MOUNT service to request the NFS file handle
1681 * corresponding to the provided path.
1682 */
1683static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1684 struct nfs_fh *root_fh)
1685{
ec88f28d
CL		 1686 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1687 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1688 struct nfs_mount_request request = {
1689 .sap = (struct sockaddr *)
1690 &args->mount_server.address,
1691 .dirpath = args->nfs_server.export_path,
1692 .protocol = args->mount_server.protocol,
1693 .fh = root_fh,
50a737f8 1694 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1695 .auth_flav_len = &server_authlist_len,
1696 .auth_flavs = server_authlist,
6d59b8d5 1697 .net = args->net,
c5d120f8 1698 };
4c568017 1699 int status;
0076d7b7
CL		 1700
1701 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1702 switch (args->version) {
1703 default:
1704 args->mount_server.version = NFS_MNT3_VERSION;
1705 break;
1706 case 2:
1707 args->mount_server.version = NFS_MNT_VERSION;
1708 }
0076d7b7 1709 }
c5d120f8 1710 request.version = args->mount_server.version;
0076d7b7 1711
33832034 1712 if (args->mount_server.hostname)
c5d120f8 1713 request.hostname = args->mount_server.hostname;
33832034 1714 else
c5d120f8 1715 request.hostname = args->nfs_server.hostname;
33832034 1716
0076d7b7
CL		 1717 /*
1718 * Construct the mount server's address.
1719 */
4c568017 1720 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1721 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1722 args->nfs_server.addrlen);
1723 args->mount_server.addrlen = args->nfs_server.addrlen;
1724 }
c5d120f8 1725 request.salen = args->mount_server.addrlen;
f5855fec 1726 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1727
1728 /*
1729 * Now ask the mount server to map our export path
1730 * to a file handle.
1731 */
c5d120f8 1732 status = nfs_mount(&request);
ec88f28d
CL		 1733 if (status != 0) {
1734 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1735 request.hostname, status);
1736 return status;
1737 }
0076d7b7 1738
ec88f28d
CL		 1739 /*
1740 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1741 */
1742 if (args->mount_server.version != NFS_MNT3_VERSION)
1743 return 0;
1744 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1745}
1746
c12bacec
RL		 1747/*
1748 * Split "dev_name" into "hostname:export_path".
1749 *
1750 * The leftmost colon demarks the split between the server's hostname
1751 * and the export path. If the hostname starts with a left square
1752 * bracket, then it may contain colons.
1753 *
1754 * Note: caller frees hostname and export path, even on error.
1755 */
1756static int nfs_parse_devname(const char *dev_name,
1757 char **hostname, size_t maxnamlen,
1758 char **export_path, size_t maxpathlen)
dc045898
CL		 1759{
1760 size_t len;
c12bacec 1761 char *end;
dc045898 1762
c12bacec
RL		 1763 /* Is the host name protected with square brakcets? */
1764 if (*dev_name == '[') {
1765 end = strchr(++dev_name, ']');
1766 if (end == NULL || end[1] != ':')
dc045898 1767 goto out_bad_devname;
dc045898 1768
c12bacec
RL		 1769 len = end - dev_name;
1770 end++;
1771 } else {
1772 char *comma;
dc045898 1773
c12bacec
RL		 1774 end = strchr(dev_name, ':');
1775 if (end == NULL)
1776 goto out_bad_devname;
1777 len = end - dev_name;
d1aa0825 1778
c12bacec
RL		 1779 /* kill possible hostname list: not supported */
1780 comma = strchr(dev_name, ',');
1781 if (comma != NULL && comma < end)
1782 *comma = 0;
1783 }
d1aa0825 1784
d1aa0825
CL		 1785 if (len > maxnamlen)
1786 goto out_hostname;
1787
1788 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1789 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1790 if (*hostname == NULL)
1791 goto out_nomem;
c12bacec 1792 len = strlen(++end);
d1aa0825
CL		 1793 if (len > maxpathlen)
1794 goto out_path;
1795 *export_path = kstrndup(end, len, GFP_KERNEL);
1796 if (!*export_path)
1797 goto out_nomem;
1798
c12bacec 1799 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1800 return 0;
1801
1802out_bad_devname:
1803 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1804 return -EINVAL;
1805
1806out_nomem:
1807 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1808 return -ENOMEM;
1809
1810out_hostname:
1811 dfprintk(MOUNT, "NFS: server hostname too long\n");
1812 return -ENAMETOOLONG;
1813
1814out_path:
1815 dfprintk(MOUNT, "NFS: export pathname too long\n");
1816 return -ENAMETOOLONG;
1817}
1818
f7b422b1 1819/*
54ceac45
DH		 1820 * Validate the NFS2/NFS3 mount data
1821 * - fills in the mount root filehandle
136d558c
CL		 1822 *
1823 * For option strings, user space handles the following behaviors:
1824 *
1825 * + DNS: mapping server host name to IP address ("addr=" option)
1826 *
1827 * + failure mode: how to behave if a mount request can't be handled
1828 * immediately ("fg/bg" option)
1829 *
1830 * + retry: how often to retry a mount request ("retry=" option)
1831 *
1832 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1833 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1834 */
2283f8d6
TT		 1835static int nfs_validate_mount_data(void *options,
1836 struct nfs_parsed_mount_data *args,
136d558c
CL		 1837 struct nfs_fh *mntfh,
1838 const char *dev_name)
f7b422b1 1839{
2283f8d6 1840 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1841 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1842
5df36e78
CL		 1843 if (data == NULL)
1844 goto out_no_data;
f7b422b1 1845
54ceac45 1846 switch (data->version) {
5df36e78
CL		 1847 case 1:
1848 data->namlen = 0;
1849 case 2:
1850 data->bsize = 0;
1851 case 3:
1852 if (data->flags & NFS_MOUNT_VER3)
1853 goto out_no_v3;
1854 data->root.size = NFS2_FHSIZE;
1855 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1856 case 4:
1857 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1858 goto out_no_sec;
1859 case 5:
1860 memset(data->context, 0, sizeof(data->context));
1861 case 6:
b7e24457
TM		 1862 if (data->flags & NFS_MOUNT_VER3) {
1863 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1864 goto out_invalid_fh;
5df36e78 1865 mntfh->size = data->root.size;
764302cc
CL		 1866 args->version = 3;
1867 } else {
5df36e78 1868 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1869 args->version = 2;
1870 }
5df36e78 1871
5df36e78
CL		 1872
1873 memcpy(mntfh->data, data->root.data, mntfh->size);
1874 if (mntfh->size < sizeof(mntfh->data))
1875 memset(mntfh->data + mntfh->size, 0,
1876 sizeof(mntfh->data) - mntfh->size);
6e88e061 1877
2283f8d6
TT		 1878 /*
1879 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1880 * can deal with.
1881 */
ff3525a5 1882 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1883 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1884 args->rsize = data->rsize;
1885 args->wsize = data->wsize;
2283f8d6
TT		 1886 args->timeo = data->timeo;
1887 args->retrans = data->retrans;
1888 args->acregmin = data->acregmin;
1889 args->acregmax = data->acregmax;
1890 args->acdirmin = data->acdirmin;
1891 args->acdirmax = data->acdirmax;
4c568017 1892
4cfd74fc 1893 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1894 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1895 if (!nfs_verify_server_address(sap))
4c568017
CL		 1896 goto out_no_address;
1897
2283f8d6 1898 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1899 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1900 /* N.B. caller will free nfs_server.hostname in all cases */
1901 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1902 args->namlen = data->namlen;
1903 args->bsize = data->bsize;
dd07c947
CL		 1904
1905 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1906 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1907 if (!args->nfs_server.hostname)
1908 goto out_nomem;
f9c3a380 1909
5eebde23
SJ		 1910 if (!(data->flags & NFS_MOUNT_NONLM))
1911 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1912 NFS_MOUNT_LOCAL_FCNTL);
1913 else
1914 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1915 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1916 /*
1917 * The legacy version 6 binary mount data from userspace has a
1918 * field used only to transport selinux information into the
1919 * the kernel. To continue to support that functionality we
1920 * have a touch of selinux knowledge here in the NFS code. The
1921 * userspace code converted context=blah to just blah so we are
1922 * converting back to the full string selinux understands.
1923 */
1924 if (data->context[0]){
1925#ifdef CONFIG_SECURITY_SELINUX
1926 int rc;
1927 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1928 if (!opts_str)
1929 return -ENOMEM;
1930 strcpy(opts_str, "context=");
1931 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1932 strcat(opts_str, &data->context[0]);
1933 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1934 kfree(opts_str);
1935 if (rc)
1936 return rc;
1937#else
1938 return -EINVAL;
1939#endif
1940 }
1941
5df36e78 1942 break;
136d558c 1943 default: {
136d558c 1944 int status;
136d558c 1945
2283f8d6
TT		 1946 if (nfs_parse_mount_options((char *)options, args) == 0)
1947 return -EINVAL;
136d558c 1948
4cfd74fc 1949 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1950 goto out_no_address;
1951
764302cc
CL		 1952 if (args->version == 4)
1953#ifdef CONFIG_NFS_V4
1954 return nfs4_validate_text_mount_data(options,
1955 args, dev_name);
1956#else
1957 goto out_v4_not_compiled;
1958#endif
1959
f5855fec 1960 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1961
259875ef
TM		 1962 nfs_set_mount_transport_protocol(args);
1963
dc045898
CL		 1964 status = nfs_parse_devname(dev_name,
1965 &args->nfs_server.hostname,
1966 PAGE_SIZE,
1967 &args->nfs_server.export_path,
1968 NFS_MAXPATHLEN);
1969 if (!status)
1970 status = nfs_try_mount(args, mntfh);
136d558c 1971
dc045898
CL		 1972 kfree(args->nfs_server.export_path);
1973 args->nfs_server.export_path = NULL;
136d558c 1974
136d558c 1975 if (status)
fdc6e2c8 1976 return status;
136d558c 1977
136d558c
CL		 1978 break;
1979 }
f7b422b1 1980 }
54ceac45
DH		 1981
1982#ifndef CONFIG_NFS_V3
8a6e5deb 1983 if (args->version == 3)
5df36e78
CL		 1984 goto out_v3_not_compiled;
1985#endif /* !CONFIG_NFS_V3 */
f7b422b1 1986
5df36e78 1987 return 0;
f7b422b1 1988
5df36e78
CL		 1989out_no_data:
1990 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1991 return -EINVAL;
54ceac45 1992
5df36e78
CL		 1993out_no_v3:
1994 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1995 data->version);
1996 return -EINVAL;
f7b422b1 1997
5df36e78
CL		 1998out_no_sec:
1999 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2000 return -EINVAL;
2001
5df36e78
CL		 2002#ifndef CONFIG_NFS_V3
2003out_v3_not_compiled:
2004 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2005 return -EPROTONOSUPPORT;
2006#endif /* !CONFIG_NFS_V3 */
2007
764302cc
CL		 2008#ifndef CONFIG_NFS_V4
2009out_v4_not_compiled:
2010 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2011 return -EPROTONOSUPPORT;
2012#endif /* !CONFIG_NFS_V4 */
2013
63649bd7
CG		 2014out_nomem:
2015 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2016 return -ENOMEM;
2017
5df36e78
CL		 2018out_no_address:
2019 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2020 return -EINVAL;
2021
2022out_invalid_fh:
2023 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2024 return -EINVAL;
f7b422b1
DH		 2025}
2026
48b605f8
JL		 2027static int
2028nfs_compare_remount_data(struct nfs_server *nfss,
2029 struct nfs_parsed_mount_data *data)
2030{
2031 if (data->flags != nfss->flags ||
2032 data->rsize != nfss->rsize ||
2033 data->wsize != nfss->wsize ||
2034 data->retrans != nfss->client->cl_timeout->to_retries ||
2035 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2036 data->acregmin != nfss->acregmin / HZ ||
2037 data->acregmax != nfss->acregmax / HZ ||
2038 data->acdirmin != nfss->acdirmin / HZ ||
2039 data->acdirmax != nfss->acdirmax / HZ ||
2040 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2041 data->nfs_server.port != nfss->port ||
48b605f8 2042 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2043 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2044 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2045 return -EINVAL;
2046
2047 return 0;
2048}
2049
2050static int
2051nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2052{
2053 int error;
2054 struct nfs_server *nfss = sb->s_fs_info;
2055 struct nfs_parsed_mount_data *data;
2056 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2057 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2058 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2059
2060 /*
2061 * Userspace mount programs that send binary options generally send
2062 * them populated with default values. We have no way to know which
2063 * ones were explicitly specified. Fall back to legacy behavior and
2064 * just return success.
2065 */
31c94469
MZ		 2066 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2067 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2068 options->version <= 6))))
48b605f8
JL		 2069 return 0;
2070
2071 data = kzalloc(sizeof(*data), GFP_KERNEL);
2072 if (data == NULL)
2073 return -ENOMEM;
2074
2075 /* fill out struct with values from existing mount */
2076 data->flags = nfss->flags;
2077 data->rsize = nfss->rsize;
2078 data->wsize = nfss->wsize;
2079 data->retrans = nfss->client->cl_timeout->to_retries;
2080 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2081 data->acregmin = nfss->acregmin / HZ;
2082 data->acregmax = nfss->acregmax / HZ;
2083 data->acdirmin = nfss->acdirmin / HZ;
2084 data->acdirmax = nfss->acdirmax / HZ;
2085 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2086 data->nfs_server.port = nfss->port;
48b605f8
JL		 2087 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2088 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2089 data->nfs_server.addrlen);
2090
2091 /* overwrite those values with any that were specified */
2092 error = nfs_parse_mount_options((char *)options, data);
2093 if (error < 0)
2094 goto out;
2095
26c4c170
JL		 2096 /*
2097 * noac is a special case. It implies -o sync, but that's not
2098 * necessarily reflected in the mtab options. do_remount_sb
2099 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2100 * remount options, so we have to explicitly reset it.
2101 */
2102 if (data->flags & NFS_MOUNT_NOAC)
2103 *flags |= MS_SYNCHRONOUS;
2104
48b605f8
JL		 2105 /* compare new mount options with old ones */
2106 error = nfs_compare_remount_data(nfss, data);
2107out:
2108 kfree(data);
2109 return error;
2110}
2111
f7b422b1 2112/*
54ceac45 2113 * Initialise the common bits of the superblock
f7b422b1 2114 */
54ceac45 2115static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2116{
54ceac45 2117 struct nfs_server *server = NFS_SB(sb);
5006a76c 2118
54ceac45 2119 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2120
54ceac45
DH		 2121 /* We probably want something more informative here */
2122 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2123 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2124
54ceac45
DH		 2125 if (sb->s_blocksize == 0)
2126 sb->s_blocksize = nfs_block_bits(server->wsize,
2127 &sb->s_blocksize_bits);
f7b422b1 2128
32a88aa1
JA		 2129 sb->s_bdi = &server->backing_dev_info;
2130
54ceac45 2131 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2132}
2133
2134/*
54ceac45 2135 * Finish setting up an NFS2/3 superblock
f7b422b1 2136 */
2283f8d6 2137static void nfs_fill_super(struct super_block *sb,
c40f8d1d 2138 struct nfs_mount_info *mount_info)
f7b422b1 2139{
c40f8d1d 2140 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2141 struct nfs_server *server = NFS_SB(sb);
5006a76c 2142
54ceac45
DH		 2143 sb->s_blocksize_bits = 0;
2144 sb->s_blocksize = 0;
2145 if (data->bsize)
2146 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2147
8a6e5deb 2148 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2149 /* The VFS shouldn't apply the umask to mode bits. We will do
2150 * so ourselves when necessary.
2151 */
2152 sb->s_flags |= MS_POSIXACL;
2153 sb->s_time_gran = 1;
816724e6 2154 }
54ceac45
DH		 2155
2156 sb->s_op = &nfs_sops;
2157 nfs_initialise_sb(sb);
f7b422b1
DH		 2158}
2159
2160/*
54ceac45 2161 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2162 */
54ceac45 2163static void nfs_clone_super(struct super_block *sb,
8c958e0c 2164 struct nfs_mount_info *mount_info)
f7b422b1 2165{
8c958e0c 2166 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2167 struct nfs_server *server = NFS_SB(sb);
2168
2169 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2170 sb->s_blocksize = old_sb->s_blocksize;
2171 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2172
8a6e5deb 2173 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2174 /* The VFS shouldn't apply the umask to mode bits. We will do
2175 * so ourselves when necessary.
f7b422b1
DH		 2176 */
2177 sb->s_flags |= MS_POSIXACL;
f7b422b1 2178 sb->s_time_gran = 1;
f7b422b1
DH		 2179 }
2180
54ceac45
DH		 2181 sb->s_op = old_sb->s_op;
2182 nfs_initialise_sb(sb);
f7b422b1
DH		 2183}
2184
275a5d24
TM		 2185static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2186{
2187 const struct nfs_server *a = s->s_fs_info;
2188 const struct rpc_clnt *clnt_a = a->client;
2189 const struct rpc_clnt *clnt_b = b->client;
2190
2191 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2192 goto Ebusy;
2193 if (a->nfs_client != b->nfs_client)
2194 goto Ebusy;
2195 if (a->flags != b->flags)
2196 goto Ebusy;
2197 if (a->wsize != b->wsize)
2198 goto Ebusy;
2199 if (a->rsize != b->rsize)
2200 goto Ebusy;
2201 if (a->acregmin != b->acregmin)
2202 goto Ebusy;
2203 if (a->acregmax != b->acregmax)
2204 goto Ebusy;
2205 if (a->acdirmin != b->acdirmin)
2206 goto Ebusy;
2207 if (a->acdirmax != b->acdirmax)
2208 goto Ebusy;
2209 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2210 goto Ebusy;
e89a5a43 2211 return 1;
275a5d24 2212Ebusy:
e89a5a43
TM		 2213 return 0;
2214}
2215
2216struct nfs_sb_mountdata {
2217 struct nfs_server *server;
2218 int mntflags;
2219};
2220
2221static int nfs_set_super(struct super_block *s, void *data)
2222{
2223 struct nfs_sb_mountdata *sb_mntdata = data;
2224 struct nfs_server *server = sb_mntdata->server;
2225 int ret;
2226
2227 s->s_flags = sb_mntdata->mntflags;
2228 s->s_fs_info = server;
8b244ff2 2229 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2230 ret = set_anon_super(s, server);
2231 if (ret == 0)
2232 server->s_dev = s->s_dev;
2233 return ret;
2234}
2235
fd00a8ff
CL		 2236static int nfs_compare_super_address(struct nfs_server *server1,
2237 struct nfs_server *server2)
2238{
2239 struct sockaddr *sap1, *sap2;
2240
2241 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2242 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2243
2244 if (sap1->sa_family != sap2->sa_family)
2245 return 0;
2246
2247 switch (sap1->sa_family) {
2248 case AF_INET: {
2249 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2250 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2251 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2252 return 0;
2253 if (sin1->sin_port != sin2->sin_port)
2254 return 0;
2255 break;
2256 }
2257 case AF_INET6: {
2258 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2259 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2260 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2261 return 0;
2262 if (sin1->sin6_port != sin2->sin6_port)
2263 return 0;
2264 break;
2265 }
2266 default:
2267 return 0;
2268 }
2269
2270 return 1;
2271}
2272
e89a5a43
TM		 2273static int nfs_compare_super(struct super_block *sb, void *data)
2274{
2275 struct nfs_sb_mountdata *sb_mntdata = data;
2276 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2277 int mntflags = sb_mntdata->mntflags;
2278
fd00a8ff 2279 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2280 return 0;
2281 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2282 if (old->flags & NFS_MOUNT_UNSHARED)
2283 return 0;
2284 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2285 return 0;
2286 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2287}
2288
2311b943
BS		 2289static void nfs_get_cache_cookie(struct super_block *sb,
2290 struct nfs_parsed_mount_data *parsed,
2291 struct nfs_clone_mount *cloned)
2292{
2293 char *uniq = NULL;
2294 int ulen = 0;
2295
2296 if (parsed && parsed->fscache_uniq) {
2297 uniq = parsed->fscache_uniq;
2298 ulen = strlen(parsed->fscache_uniq);
2299 } else if (cloned) {
2300 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2301 if (mnt_s->fscache_key) {
2302 uniq = mnt_s->fscache_key->key.uniquifier;
2303 ulen = mnt_s->fscache_key->key.uniq_len;
2304 };
2305 }
2306
2307 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2308}
2309
fa799759
MS		 2310static int nfs_bdi_register(struct nfs_server *server)
2311{
2312 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2313}
2314
3d176e3f
BS		 2315static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2316 struct nfs_mount_info *mount_info)
2317{
2318 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2319}
2320
2321static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2322 struct nfs_mount_info *mount_info)
2323{
2324 /* clone any lsm security options from the parent to the new sb */
2325 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2326 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2327 return -ESTALE;
2328 return 0;
2329}
2330
c40f8d1d
BS		 2331static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2332 struct nfs_server *server,
2333 int flags, const char *dev_name,
2334 struct nfs_fh *mntfh,
2335 struct nfs_mount_info *mount_info)
f7b422b1 2336{
f7b422b1 2337 struct super_block *s;
01194981 2338 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2339 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2340 struct nfs_sb_mountdata sb_mntdata = {
2341 .mntflags = flags,
c40f8d1d 2342 .server = server,
e89a5a43 2343 };
01194981 2344 int error;
33852a1f 2345
75180df2
TM		 2346 if (server->flags & NFS_MOUNT_UNSHARED)
2347 compare_super = NULL;
2348
fb2088cc
SP		 2349 /* -o noac implies -o sync */
2350 if (server->flags & NFS_MOUNT_NOAC)
2351 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2352
54ceac45 2353 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2354 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2355 if (IS_ERR(s)) {
01194981 2356 mntroot = ERR_CAST(s);
54ceac45 2357 goto out_err_nosb;
816724e6
TM		 2358 }
2359
54ceac45
DH		 2360 if (s->s_fs_info != server) {
2361 nfs_free_server(server);
2362 server = NULL;
fa799759
MS		 2363 } else {
2364 error = nfs_bdi_register(server);
01194981
AV		 2365 if (error) {
2366 mntroot = ERR_PTR(error);
cfbc0683 2367 goto error_splat_bdi;
01194981 2368 }
54ceac45 2369 }
f7b422b1 2370
54ceac45
DH		 2371 if (!s->s_root) {
2372 /* initial superblock/root creation */
c40f8d1d 2373 mount_info->fill_super(s, mount_info);
3d176e3f 2374 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2375 }
f7b422b1 2376
0d5839ad 2377 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2378 if (IS_ERR(mntroot))
54ceac45 2379 goto error_splat_super;
816724e6 2380
3d176e3f 2381 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2382 if (error)
2383 goto error_splat_root;
2384
54ceac45 2385 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2386
2387out:
01194981 2388 return mntroot;
816724e6 2389
54ceac45
DH		 2390out_err_nosb:
2391 nfs_free_server(server);
0655960f 2392 goto out;
54ceac45 2393
f9c3a380
EP		 2394error_splat_root:
2395 dput(mntroot);
01194981 2396 mntroot = ERR_PTR(error);
54ceac45 2397error_splat_super:
cfbc0683
N		 2398 if (server && !s->s_root)
2399 bdi_unregister(&server->backing_dev_info);
2400error_splat_bdi:
6f5bbff9 2401 deactivate_locked_super(s);
0655960f 2402 goto out;
f7b422b1
DH		 2403}
2404
c40f8d1d
BS		 2405static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2406 int flags, const char *dev_name, void *raw_data)
2407{
2408 struct nfs_server *server;
2409 struct nfs_parsed_mount_data *data = NULL;
2410 struct nfs_mount_info mount_info = {
2411 .fill_super = nfs_fill_super,
3d176e3f 2412 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2413 };
2414 struct nfs_fh *mntfh;
2415 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2416 int error;
2417
db833351 2418 data = nfs_alloc_parsed_mount_data();
c40f8d1d
BS		 2419 mntfh = nfs_alloc_fhandle();
2420 if (data == NULL || mntfh == NULL)
2421 goto out;
2422
2423 /* Validate the mount data */
2424 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2425 if (error < 0) {
2426 mntroot = ERR_PTR(error);
2427 goto out;
2428 }
2429 mount_info.parsed = data;
2430
2431#ifdef CONFIG_NFS_V4
2432 if (data->version == 4) {
2433 mntroot = nfs4_try_mount(flags, dev_name, data);
2434 goto out;
2435 }
2436#endif /* CONFIG_NFS_V4 */
2437
2438 /* Get a volume representation */
2439 server = nfs_create_server(data, mntfh);
2440 if (IS_ERR(server)) {
2441 mntroot = ERR_CAST(server);
2442 goto out;
2443 }
2444
2445 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mntfh, &mount_info);
2446out:
2447 nfs_free_parsed_mount_data(data);
2448 nfs_free_fhandle(mntfh);
2449 return mntroot;
2450}
2451
387c149b
TM		 2452/*
2453 * Ensure that we unregister the bdi before kill_anon_super
2454 * releases the device name
2455 */
2456static void nfs_put_super(struct super_block *s)
2457{
2458 struct nfs_server *server = NFS_SB(s);
2459
2460 bdi_unregister(&server->backing_dev_info);
2461}
2462
54ceac45
DH		 2463/*
2464 * Destroy an NFS2/3 superblock
2465 */
f7b422b1
DH		 2466static void nfs_kill_super(struct super_block *s)
2467{
2468 struct nfs_server *server = NFS_SB(s);
2469
2470 kill_anon_super(s);
08734048 2471 nfs_fscache_release_super_cookie(s);
54ceac45 2472 nfs_free_server(server);
f7b422b1
DH		 2473}
2474
54ceac45 2475/*
8c958e0c 2476 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2477 */
31f43471 2478static struct dentry *
8c958e0c
BS		 2479nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2480 const char *dev_name, struct nfs_mount_info *mount_info)
f7b422b1 2481{
8c958e0c 2482 struct nfs_clone_mount *data = mount_info->cloned;
54ceac45 2483 struct nfs_server *server;
3d176e3f 2484 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45 2485 int error;
f7b422b1 2486
8c958e0c 2487 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2488
54ceac45 2489 /* create a new volume representation */
7e6eb683 2490 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2491 if (IS_ERR(server)) {
2492 error = PTR_ERR(server);
3d176e3f 2493 goto out_err;
4c1fe2f7 2494 }
f7b422b1 2495
3d176e3f 2496 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, data->fh, mount_info);
8c958e0c 2497 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2498out:
31f43471 2499 return mntroot;
24c8dbbb 2500
3d176e3f 2501out_err:
8c958e0c 2502 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2503 goto out;
f7b422b1
DH		 2504}
2505
8c958e0c
BS		 2506/*
2507 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2508 */
2509static struct dentry *
2510nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2511 const char *dev_name, void *raw_data)
2512{
2513 struct nfs_mount_info mount_info = {
2514 .fill_super = nfs_clone_super,
3d176e3f 2515 .set_security = nfs_clone_sb_security,
8c958e0c
BS		 2516 .cloned = raw_data,
2517 };
2518 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2519}
2520
54ceac45
DH		 2521#ifdef CONFIG_NFS_V4
2522
f7b422b1 2523/*
54ceac45 2524 * Finish setting up a cloned NFS4 superblock
f7b422b1 2525 */
54ceac45 2526static void nfs4_clone_super(struct super_block *sb,
8c958e0c 2527 struct nfs_mount_info *mount_info)
f7b422b1 2528{
8c958e0c 2529 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2530 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2531 sb->s_blocksize = old_sb->s_blocksize;
2532 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2533 sb->s_time_gran = 1;
54ceac45 2534 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2535 /*
2536 * The VFS shouldn't apply the umask to mode bits. We will do
2537 * so ourselves when necessary.
2538 */
2539 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2540 sb->s_xattr = old_sb->s_xattr;
2541 nfs_initialise_sb(sb);
f7b422b1
DH		 2542}
2543
54ceac45
DH		 2544/*
2545 * Set up an NFS4 superblock
2546 */
c40f8d1d
BS		 2547static void nfs4_fill_super(struct super_block *sb,
2548 struct nfs_mount_info *mount_info)
f7b422b1 2549{
54ceac45
DH		 2550 sb->s_time_gran = 1;
2551 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2552 /*
2553 * The VFS shouldn't apply the umask to mode bits. We will do
2554 * so ourselves when necessary.
2555 */
2556 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2557 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2558 nfs_initialise_sb(sb);
f7b422b1
DH		 2559}
2560
01c3f052
TM		 2561static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2562{
5eebde23
SJ		 2563 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2564 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2565}
2566
7630c852
CL		 2567static int nfs4_validate_text_mount_data(void *options,
2568 struct nfs_parsed_mount_data *args,
2569 const char *dev_name)
2570{
2571 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2572
f5855fec 2573 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2574
2575 nfs_validate_transport_protocol(args);
2576
2577 nfs4_validate_mount_flags(args);
2578
2ecda72b
TM		 2579 if (args->version != 4) {
2580 dfprintk(MOUNT,
2581 "NFS4: Illegal mount version\n");
2582 return -EINVAL;
2583 }
2584
7630c852
CL		 2585 if (args->auth_flavor_len > 1) {
2586 dfprintk(MOUNT,
2587 "NFS4: Too many RPC auth flavours specified\n");
2588 return -EINVAL;
2589 }
2590
7630c852
CL		 2591 return nfs_parse_devname(dev_name,
2592 &args->nfs_server.hostname,
2593 NFS4_MAXNAMLEN,
2594 &args->nfs_server.export_path,
2595 NFS4_MAXPATHLEN);
2596}
2597
f0768ebd
CL		 2598/*
2599 * Validate NFSv4 mount options
2600 */
91ea40b9
TT		 2601static int nfs4_validate_mount_data(void *options,
2602 struct nfs_parsed_mount_data *args,
2603 const char *dev_name)
f0768ebd 2604{
4cfd74fc 2605 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2606 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2607 char *c;
2608
2609 if (data == NULL)
2610 goto out_no_data;
2611
2612 switch (data->version) {
2613 case 1:
4c568017
CL		 2614 if (data->host_addrlen > sizeof(args->nfs_server.address))
2615 goto out_no_address;
2616 if (data->host_addrlen == 0)
f0768ebd 2617 goto out_no_address;
4c568017 2618 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2619 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2620 return -EFAULT;
4cfd74fc 2621 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2622 goto out_no_address;
2623
6738b251
CL		 2624 if (data->auth_flavourlen) {
2625 if (data->auth_flavourlen > 1)
2626 goto out_inval_auth;
20c71f5e 2627 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2628 data->auth_flavours,
20c71f5e 2629 sizeof(args->auth_flavors[0])))
f0768ebd 2630 return -EFAULT;
f0768ebd
CL		 2631 }
2632
2633 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2634 if (IS_ERR(c))
2635 return PTR_ERR(c);
91ea40b9 2636 args->nfs_server.hostname = c;
f0768ebd
CL		 2637
2638 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2639 if (IS_ERR(c))
2640 return PTR_ERR(c);
91ea40b9
TT		 2641 args->nfs_server.export_path = c;
2642 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2643
2644 c = strndup_user(data->client_addr.data, 16);
2645 if (IS_ERR(c))
2646 return PTR_ERR(c);
91ea40b9
TT		 2647 args->client_address = c;
2648
2649 /*
2650 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2651 * can deal with.
2652 */
2653
2654 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2655 args->rsize = data->rsize;
2656 args->wsize = data->wsize;
2657 args->timeo = data->timeo;
2658 args->retrans = data->retrans;
2659 args->acregmin = data->acregmin;
2660 args->acregmax = data->acregmax;
2661 args->acdirmin = data->acdirmin;
2662 args->acdirmax = data->acdirmax;
2663 args->nfs_server.protocol = data->proto;
259875ef 2664 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2665
2666 break;
7630c852 2667 default:
91ea40b9 2668 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2669 return -EINVAL;
2670
4cfd74fc 2671 if (!nfs_verify_server_address(sap))
80071225 2672 return -EINVAL;
dc045898 2673
7630c852 2674 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2675 }
2676
2677 return 0;
2678
2679out_no_data:
2680 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2681 return -EINVAL;
2682
2683out_inval_auth:
2684 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2685 data->auth_flavourlen);
2686 return -EINVAL;
2687
2688out_no_address:
2689 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2690 return -EINVAL;
f0768ebd
CL		 2691}
2692
54ceac45 2693/*
c02d7adf 2694 * Get the superblock for the NFS4 root partition
54ceac45 2695 */
31f43471
AV		 2696static struct dentry *
2697nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2698 const char *dev_name, void *raw_data)
f7b422b1 2699{
c40f8d1d
BS		 2700 struct nfs_mount_info mount_info = {
2701 .fill_super = nfs4_fill_super,
3d176e3f 2702 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2703 .parsed = raw_data,
2704 };
54ceac45 2705 struct nfs_server *server;
33852a1f 2706 struct nfs_fh *mntfh;
c40f8d1d 2707 struct dentry *mntroot = ERR_PTR(-ENOMEM);
33852a1f 2708
b157b06c 2709 mntfh = nfs_alloc_fhandle();
c40f8d1d 2710 if (mount_info.parsed == NULL || mntfh == NULL)
8a0d551a 2711 goto out;
f9c3a380 2712
54ceac45 2713 /* Get a volume representation */
c40f8d1d 2714 server = nfs4_create_server(mount_info.parsed, mntfh);
54ceac45 2715 if (IS_ERR(server)) {
c40f8d1d 2716 mntroot = ERR_CAST(server);
29eb981a 2717 goto out;
f7b422b1
DH		 2718 }
2719
c40f8d1d
BS		 2720 mntroot = nfs_fs_mount_common(fs_type, server, flags,
2721 dev_name, mntfh, &mount_info);
29eb981a
CL		 2722
2723out:
b157b06c 2724 nfs_free_fhandle(mntfh);
c40f8d1d 2725 return mntroot;
f7b422b1
DH		 2726}
2727
c02d7adf
TM		 2728static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2729 int flags, void *data, const char *hostname)
2730{
2731 struct vfsmount *root_mnt;
2732 char *root_devname;
2733 size_t len;
2734
98a2139f 2735 len = strlen(hostname) + 5;
c02d7adf
TM		 2736 root_devname = kmalloc(len, GFP_KERNEL);
2737 if (root_devname == NULL)
2738 return ERR_PTR(-ENOMEM);
98a2139f
JK		 2739 /* Does hostname needs to be enclosed in brackets? */
2740 if (strchr(hostname, ':'))
2741 snprintf(root_devname, len, "[%s]:/", hostname);
2742 else
2743 snprintf(root_devname, len, "%s:/", hostname);
c02d7adf
TM		 2744 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2745 kfree(root_devname);
2746 return root_mnt;
2747}
2748
ce587e07
TM		 2749struct nfs_referral_count {
2750 struct list_head list;
2751 const struct task_struct *task;
2752 unsigned int referral_count;
2753};
2754
2755static LIST_HEAD(nfs_referral_count_list);
2756static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2757
2758static struct nfs_referral_count *nfs_find_referral_count(void)
2759{
2760 struct nfs_referral_count *p;
2761
2762 list_for_each_entry(p, &nfs_referral_count_list, list) {
2763 if (p->task == current)
2764 return p;
2765 }
2766 return NULL;
2767}
2768
2769#define NFS_MAX_NESTED_REFERRALS 2
2770
2771static int nfs_referral_loop_protect(void)
2772{
2773 struct nfs_referral_count *p, *new;
2774 int ret = -ENOMEM;
2775
2776 new = kmalloc(sizeof(*new), GFP_KERNEL);
2777 if (!new)
2778 goto out;
2779 new->task = current;
2780 new->referral_count = 1;
2781
2782 ret = 0;
2783 spin_lock(&nfs_referral_count_list_lock);
2784 p = nfs_find_referral_count();
2785 if (p != NULL) {
2786 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2787 ret = -ELOOP;
2788 else
2789 p->referral_count++;
2790 } else {
2791 list_add(&new->list, &nfs_referral_count_list);
2792 new = NULL;
2793 }
2794 spin_unlock(&nfs_referral_count_list_lock);
2795 kfree(new);
2796out:
2797 return ret;
2798}
2799
2800static void nfs_referral_loop_unprotect(void)
2801{
2802 struct nfs_referral_count *p;
2803
2804 spin_lock(&nfs_referral_count_list_lock);
2805 p = nfs_find_referral_count();
2806 p->referral_count--;
2807 if (p->referral_count == 0)
2808 list_del(&p->list);
2809 else
2810 p = NULL;
2811 spin_unlock(&nfs_referral_count_list_lock);
2812 kfree(p);
2813}
2814
01194981
AV		 2815static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2816 const char *export_path)
c02d7adf 2817{
01194981 2818 struct dentry *dentry;
5352d3b6 2819 int err;
c02d7adf 2820
5352d3b6
AV		 2821 if (IS_ERR(root_mnt))
2822 return ERR_CAST(root_mnt);
2823
2824 err = nfs_referral_loop_protect();
2825 if (err) {
ea441d11 2826 mntput(root_mnt);
5352d3b6 2827 return ERR_PTR(err);
ea441d11 2828 }
c02d7adf 2829
ea441d11
AV		 2830 dentry = mount_subtree(root_mnt, export_path);
2831 nfs_referral_loop_unprotect();
c02d7adf 2832
01194981 2833 return dentry;
c02d7adf
TM		 2834}
2835
01194981
AV		 2836static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2837 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2838{
2839 char *export_path;
2840 struct vfsmount *root_mnt;
01194981 2841 struct dentry *res;
a6fe23be
CL		 2842
2843 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2844
2845 export_path = data->nfs_server.export_path;
2846 data->nfs_server.export_path = "/";
2847 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2848 data->nfs_server.hostname);
2849 data->nfs_server.export_path = export_path;
2850
5352d3b6 2851 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2852
01194981
AV		 2853 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2854 IS_ERR(res) ? PTR_ERR(res) : 0,
2855 IS_ERR(res) ? " [error]" : "");
2856 return res;
a6fe23be
CL		 2857}
2858
c02d7adf
TM		 2859/*
2860 * Get the superblock for an NFS4 mountpoint
2861 */
01194981
AV		 2862static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2863 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2864{
2865 struct nfs_parsed_mount_data *data;
c02d7adf 2866 int error = -ENOMEM;
01194981 2867 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2868
db833351 2869 data = nfs_alloc_parsed_mount_data();
c02d7adf 2870 if (data == NULL)
8a0d551a 2871 goto out;
c02d7adf
TM		 2872
2873 /* Validate the mount data */
2874 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2875 if (error < 0) {
2876 res = ERR_PTR(error);
c02d7adf 2877 goto out;
01194981 2878 }
c02d7adf 2879
01194981
AV		 2880 res = nfs4_try_mount(flags, dev_name, data);
2881 if (IS_ERR(res))
2882 error = PTR_ERR(res);
c02d7adf
TM		 2883
2884out:
8a0d551a 2885 nfs_free_parsed_mount_data(data);
01194981 2886 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2887 error != 0 ? " [error]" : "");
01194981 2888 return res;
c02d7adf
TM		 2889}
2890
f7b422b1
DH		 2891static void nfs4_kill_super(struct super_block *sb)
2892{
2893 struct nfs_server *server = NFS_SB(sb);
2894
0f3e66c6 2895 dprintk("--> %s\n", __func__);
515d8611 2896 nfs_super_return_all_delegations(sb);
f7b422b1 2897 kill_anon_super(sb);
08734048 2898 nfs_fscache_release_super_cookie(sb);
54ceac45 2899 nfs_free_server(server);
0f3e66c6 2900 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2901}
2902
2903/*
54ceac45 2904 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2905 */
31f43471
AV		 2906static struct dentry *
2907nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2908 const char *dev_name, void *raw_data)
f7b422b1 2909{
8c958e0c
BS		 2910 struct nfs_mount_info mount_info = {
2911 .fill_super = nfs4_clone_super,
3d176e3f 2912 .set_security = nfs_clone_sb_security,
8c958e0c 2913 .cloned = raw_data,
e89a5a43 2914 };
8c958e0c 2915 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
f7b422b1
DH		 2916}
2917
31f43471
AV		 2918static struct dentry *
2919nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2920 const char *dev_name, void *raw_data)
f7b422b1 2921{
21e4b82e
BS		 2922 struct nfs_mount_info mount_info = {
2923 .fill_super = nfs4_fill_super,
2924 .set_security = nfs_clone_sb_security,
2925 .cloned = raw_data,
2926 };
54ceac45 2927 struct nfs_server *server;
21e4b82e 2928 struct dentry *mntroot = ERR_PTR(-ENOMEM);
4f727296 2929 struct nfs_fh *mntfh;
54ceac45
DH		 2930
2931 dprintk("--> nfs4_referral_get_sb()\n");
2932
4f727296 2933 mntfh = nfs_alloc_fhandle();
21e4b82e
BS		 2934 if (mount_info.cloned == NULL || mntfh == NULL)
2935 goto out;
4f727296 2936
54ceac45 2937 /* create a new volume representation */
21e4b82e 2938 server = nfs4_create_referral_server(mount_info.cloned, mntfh);
54ceac45 2939 if (IS_ERR(server)) {
21e4b82e
BS		 2940 mntroot = ERR_CAST(server);
2941 goto out;
e9cc6c23 2942 }
54ceac45 2943
21e4b82e
BS		 2944 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, mntfh, &mount_info);
2945out:
4f727296 2946 nfs_free_fhandle(mntfh);
31f43471 2947 return mntroot;
f7b422b1
DH		 2948}
2949
c02d7adf
TM		 2950/*
2951 * Create an NFS4 server record on referral traversal
2952 */
01194981
AV		 2953static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2954 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2955{
2956 struct nfs_clone_mount *data = raw_data;
2957 char *export_path;
2958 struct vfsmount *root_mnt;
01194981 2959 struct dentry *res;
c02d7adf 2960
01194981 2961 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 2962
2963 export_path = data->mnt_path;
2964 data->mnt_path = "/";
2965
2966 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2967 flags, data, data->hostname);
2968 data->mnt_path = export_path;
2969
5352d3b6 2970 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 2971 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2972 IS_ERR(res) ? PTR_ERR(res) : 0,
2973 IS_ERR(res) ? " [error]" : "");
2974 return res;
c02d7adf
TM		 2975}
2976
54ceac45 2977#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
This page took 0.7769 seconds and 5 git commands to generate.