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NFS: Use nfs_fs_mount_common() for remote referral mounts
[mirror_ubuntu-bionic-kernel.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
c5811dbd 948static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
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;
c5811dbd 963 data->version = version;
9423a08a 964 data->minorversion = 0;
9937347a 965 data->net = current->nsproxy->net_ns;
8a0d551a 966 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 967 }
968 return data;
969}
970
8a0d551a
JL		 971static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
972{
973 if (data) {
974 kfree(data->client_address);
975 kfree(data->mount_server.hostname);
976 kfree(data->nfs_server.export_path);
977 kfree(data->nfs_server.hostname);
978 kfree(data->fscache_uniq);
979 security_free_mnt_opts(&data->lsm_opts);
980 kfree(data);
981 }
982}
983
fc50d58f 984/*
cdcd7f9a
CL		 985 * Sanity-check a server address provided by the mount command.
986 *
987 * Address family must be initialized, and address must not be
988 * the ANY address for that family.
fc50d58f
CL		 989 */
990static int nfs_verify_server_address(struct sockaddr *addr)
991{
992 switch (addr->sa_family) {
993 case AF_INET: {
cdcd7f9a 994 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 995 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 996 }
997 case AF_INET6: {
998 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
999 return !ipv6_addr_any(sa);
fc50d58f
CL		 1000 }
1001 }
1002
53a0b9c4 1003 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 1004 return 0;
1005}
1006
4cfd74fc
CL		 1007/*
1008 * Select between a default port value and a user-specified port value.
1009 * If a zero value is set, then autobind will be used.
1010 */
f5855fec 1011static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1012 const unsigned short default_port)
1013{
f5855fec
TM		 1014 if (*port == NFS_UNSPEC_PORT)
1015 *port = default_port;
4cfd74fc 1016
f5855fec 1017 rpc_set_port(sap, *port);
4cfd74fc
CL		 1018}
1019
259875ef
TM		 1020/*
1021 * Sanity check the NFS transport protocol.
1022 *
1023 */
1024static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1025{
1026 switch (mnt->nfs_server.protocol) {
1027 case XPRT_TRANSPORT_UDP:
1028 case XPRT_TRANSPORT_TCP:
1029 case XPRT_TRANSPORT_RDMA:
1030 break;
1031 default:
1032 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1033 }
1034}
1035
1036/*
1037 * For text based NFSv2/v3 mounts, the mount protocol transport default
1038 * settings should depend upon the specified NFS transport.
1039 */
1040static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1041{
1042 nfs_validate_transport_protocol(mnt);
1043
1044 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1045 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1046 return;
1047 switch (mnt->nfs_server.protocol) {
1048 case XPRT_TRANSPORT_UDP:
1049 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1050 break;
1051 case XPRT_TRANSPORT_TCP:
1052 case XPRT_TRANSPORT_RDMA:
1053 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1054 }
1055}
1056
01060c89
CL		 1057/*
1058 * Parse the value of the 'sec=' option.
01060c89
CL		 1059 */
1060static int nfs_parse_security_flavors(char *value,
1061 struct nfs_parsed_mount_data *mnt)
1062{
1063 substring_t args[MAX_OPT_ARGS];
1064
1065 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1066
1067 switch (match_token(value, nfs_secflavor_tokens, args)) {
1068 case Opt_sec_none:
01060c89
CL		 1069 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1070 break;
1071 case Opt_sec_sys:
01060c89
CL		 1072 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1073 break;
1074 case Opt_sec_krb5:
01060c89
CL		 1075 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1076 break;
1077 case Opt_sec_krb5i:
01060c89
CL		 1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1079 break;
1080 case Opt_sec_krb5p:
01060c89
CL		 1081 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1082 break;
1083 case Opt_sec_lkey:
01060c89
CL		 1084 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1085 break;
1086 case Opt_sec_lkeyi:
01060c89
CL		 1087 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1088 break;
1089 case Opt_sec_lkeyp:
01060c89
CL		 1090 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1091 break;
1092 case Opt_sec_spkm:
01060c89
CL		 1093 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1094 break;
1095 case Opt_sec_spkmi:
01060c89
CL		 1096 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1097 break;
1098 case Opt_sec_spkmp:
01060c89
CL		 1099 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1100 break;
1101 default:
1102 return 0;
1103 }
1104
9b7160c5 1105 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1106 mnt->auth_flavor_len = 1;
01060c89
CL		 1107 return 1;
1108}
1109
0d71b058
TM		 1110static int nfs_parse_version_string(char *string,
1111 struct nfs_parsed_mount_data *mnt,
1112 substring_t *args)
1113{
1114 mnt->flags &= ~NFS_MOUNT_VER3;
1115 switch (match_token(string, nfs_vers_tokens, args)) {
1116 case Opt_vers_2:
1117 mnt->version = 2;
1118 break;
1119 case Opt_vers_3:
1120 mnt->flags |= NFS_MOUNT_VER3;
1121 mnt->version = 3;
1122 break;
1123 case Opt_vers_4:
1124 /* Backward compatibility option. In future,
1125 * the mount program should always supply
1126 * a NFSv4 minor version number.
1127 */
1128 mnt->version = 4;
1129 break;
1130 case Opt_vers_4_0:
1131 mnt->version = 4;
1132 mnt->minorversion = 0;
1133 break;
1134 case Opt_vers_4_1:
1135 mnt->version = 4;
1136 mnt->minorversion = 1;
1137 break;
1138 default:
1139 return 0;
1140 }
1141 return 1;
1142}
1143
c5cb09b6
RL		 1144static int nfs_get_option_str(substring_t args[], char **option)
1145{
1146 kfree(*option);
1147 *option = match_strdup(args);
1148 return !option;
1149}
1150
1151static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1152{
1153 int rc;
1154 char *string;
1155
1156 string = match_strdup(args);
1157 if (string == NULL)
1158 return -ENOMEM;
1159 rc = strict_strtoul(string, 10, option);
1160 kfree(string);
1161
1162 return rc;
1163}
1164
bf0fd768
CL		 1165/*
1166 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1167 * a data structure. The whole mount string is processed; bad options are
1168 * skipped as they are encountered. If there were no errors, return 1;
1169 * otherwise return 0 (zero).
bf0fd768
CL		 1170 */
1171static int nfs_parse_mount_options(char *raw,
1172 struct nfs_parsed_mount_data *mnt)
1173{
f9c3a380 1174 char *p, *string, *secdata;
d23c45fd 1175 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1176 unsigned short protofamily = AF_UNSPEC;
1177 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1178
1179 if (!raw) {
1180 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1181 return 1;
1182 }
1183 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1184
f9c3a380
EP		 1185 secdata = alloc_secdata();
1186 if (!secdata)
1187 goto out_nomem;
1188
1189 rc = security_sb_copy_data(raw, secdata);
1190 if (rc)
1191 goto out_security_failure;
1192
1193 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1194 if (rc)
1195 goto out_security_failure;
1196
1197 free_secdata(secdata);
1198
bf0fd768
CL		 1199 while ((p = strsep(&raw, ",")) != NULL) {
1200 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1201 unsigned long option;
1202 int token;
bf0fd768
CL		 1203
1204 if (!*p)
1205 continue;
1206
1207 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1208
1209 token = match_token(p, nfs_mount_option_tokens, args);
1210 switch (token) {
f45663ce
CL		 1211
1212 /*
1213 * boolean options: foo/nofoo
1214 */
bf0fd768
CL		 1215 case Opt_soft:
1216 mnt->flags |= NFS_MOUNT_SOFT;
1217 break;
1218 case Opt_hard:
1219 mnt->flags &= ~NFS_MOUNT_SOFT;
1220 break;
bf0fd768
CL		 1221 case Opt_posix:
1222 mnt->flags |= NFS_MOUNT_POSIX;
1223 break;
1224 case Opt_noposix:
1225 mnt->flags &= ~NFS_MOUNT_POSIX;
1226 break;
1227 case Opt_cto:
1228 mnt->flags &= ~NFS_MOUNT_NOCTO;
1229 break;
1230 case Opt_nocto:
1231 mnt->flags |= NFS_MOUNT_NOCTO;
1232 break;
1233 case Opt_ac:
1234 mnt->flags &= ~NFS_MOUNT_NOAC;
1235 break;
1236 case Opt_noac:
1237 mnt->flags |= NFS_MOUNT_NOAC;
1238 break;
1239 case Opt_lock:
1240 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1241 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1242 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1243 break;
1244 case Opt_nolock:
1245 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1246 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1247 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1248 break;
bf0fd768
CL		 1249 case Opt_udp:
1250 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1251 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1252 break;
1253 case Opt_tcp:
1254 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1255 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1256 break;
2cf7ff7a
TT		 1257 case Opt_rdma:
1258 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1259 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1260 xprt_load_transport(p);
2cf7ff7a 1261 break;
bf0fd768
CL		 1262 case Opt_acl:
1263 mnt->flags &= ~NFS_MOUNT_NOACL;
1264 break;
1265 case Opt_noacl:
1266 mnt->flags |= NFS_MOUNT_NOACL;
1267 break;
1268 case Opt_rdirplus:
1269 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1270 break;
1271 case Opt_nordirplus:
1272 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1273 break;
75180df2
TM		 1274 case Opt_sharecache:
1275 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1276 break;
1277 case Opt_nosharecache:
1278 mnt->flags |= NFS_MOUNT_UNSHARED;
1279 break;
d740351b
CL		 1280 case Opt_resvport:
1281 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1282 break;
1283 case Opt_noresvport:
1284 mnt->flags |= NFS_MOUNT_NORESVPORT;
1285 break;
b797cac7
DH		 1286 case Opt_fscache:
1287 mnt->options |= NFS_OPTION_FSCACHE;
1288 kfree(mnt->fscache_uniq);
1289 mnt->fscache_uniq = NULL;
1290 break;
1291 case Opt_nofscache:
1292 mnt->options &= ~NFS_OPTION_FSCACHE;
1293 kfree(mnt->fscache_uniq);
1294 mnt->fscache_uniq = NULL;
1295 break;
bf0fd768 1296
f45663ce
CL		 1297 /*
1298 * options that take numeric values
1299 */
bf0fd768 1300 case Opt_port:
c5cb09b6
RL		 1301 if (nfs_get_option_ul(args, &option) ||
1302 option > USHRT_MAX)
d23c45fd
CL		 1303 goto out_invalid_value;
1304 mnt->nfs_server.port = option;
bf0fd768
CL		 1305 break;
1306 case Opt_rsize:
c5cb09b6 1307 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1308 goto out_invalid_value;
1309 mnt->rsize = option;
bf0fd768
CL		 1310 break;
1311 case Opt_wsize:
c5cb09b6 1312 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1313 goto out_invalid_value;
1314 mnt->wsize = option;
bf0fd768
CL		 1315 break;
1316 case Opt_bsize:
c5cb09b6 1317 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1318 goto out_invalid_value;
1319 mnt->bsize = option;
bf0fd768
CL		 1320 break;
1321 case Opt_timeo:
c5cb09b6 1322 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1323 goto out_invalid_value;
1324 mnt->timeo = option;
bf0fd768
CL		 1325 break;
1326 case Opt_retrans:
c5cb09b6 1327 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1328 goto out_invalid_value;
1329 mnt->retrans = option;
bf0fd768
CL		 1330 break;
1331 case Opt_acregmin:
c5cb09b6 1332 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1333 goto out_invalid_value;
1334 mnt->acregmin = option;
bf0fd768
CL		 1335 break;
1336 case Opt_acregmax:
c5cb09b6 1337 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1338 goto out_invalid_value;
1339 mnt->acregmax = option;
bf0fd768
CL		 1340 break;
1341 case Opt_acdirmin:
c5cb09b6 1342 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1343 goto out_invalid_value;
1344 mnt->acdirmin = option;
bf0fd768
CL		 1345 break;
1346 case Opt_acdirmax:
c5cb09b6 1347 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1348 goto out_invalid_value;
1349 mnt->acdirmax = option;
bf0fd768
CL		 1350 break;
1351 case Opt_actimeo:
c5cb09b6 1352 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1353 goto out_invalid_value;
1354 mnt->acregmin = mnt->acregmax =
1355 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1356 break;
1357 case Opt_namelen:
c5cb09b6 1358 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1359 goto out_invalid_value;
1360 mnt->namlen = option;
bf0fd768
CL		 1361 break;
1362 case Opt_mountport:
c5cb09b6
RL		 1363 if (nfs_get_option_ul(args, &option) ||
1364 option > USHRT_MAX)
d23c45fd
CL		 1365 goto out_invalid_value;
1366 mnt->mount_server.port = option;
bf0fd768 1367 break;
bf0fd768 1368 case Opt_mountvers:
c5cb09b6 1369 if (nfs_get_option_ul(args, &option) ||
f45663ce 1370 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1371 option > NFS_MNT3_VERSION)
1372 goto out_invalid_value;
1373 mnt->mount_server.version = option;
bf0fd768 1374 break;
3fd5be9e 1375 case Opt_minorversion:
c5cb09b6 1376 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1377 goto out_invalid_value;
1378 if (option > NFS4_MAX_MINOR_VERSION)
1379 goto out_invalid_value;
1380 mnt->minorversion = option;
3fd5be9e 1381 break;
bf0fd768 1382
f45663ce
CL		 1383 /*
1384 * options that take text values
1385 */
0d71b058
TM		 1386 case Opt_nfsvers:
1387 string = match_strdup(args);
1388 if (string == NULL)
1389 goto out_nomem;
1390 rc = nfs_parse_version_string(string, mnt, args);
1391 kfree(string);
1392 if (!rc)
1393 goto out_invalid_value;
1394 break;
bf0fd768
CL		 1395 case Opt_sec:
1396 string = match_strdup(args);
1397 if (string == NULL)
1398 goto out_nomem;
01060c89 1399 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1400 kfree(string);
f45663ce 1401 if (!rc) {
f45663ce
CL		 1402 dfprintk(MOUNT, "NFS: unrecognized "
1403 "security flavor\n");
d23c45fd 1404 return 0;
f45663ce 1405 }
bf0fd768
CL		 1406 break;
1407 case Opt_proto:
1408 string = match_strdup(args);
1409 if (string == NULL)
1410 goto out_nomem;
1411 token = match_token(string,
1412 nfs_xprt_protocol_tokens, args);
bf0fd768 1413
ee671b01 1414 protofamily = AF_INET;
bf0fd768 1415 switch (token) {
ee671b01
JL		 1416 case Opt_xprt_udp6:
1417 protofamily = AF_INET6;
fdb66ff4 1418 case Opt_xprt_udp:
bf0fd768 1419 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1420 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1421 break;
ee671b01
JL		 1422 case Opt_xprt_tcp6:
1423 protofamily = AF_INET6;
fdb66ff4 1424 case Opt_xprt_tcp:
bf0fd768 1425 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1426 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1427 break;
2cf7ff7a
TT		 1428 case Opt_xprt_rdma:
1429 /* vector side protocols to TCP */
1430 mnt->flags |= NFS_MOUNT_TCP;
1431 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1432 xprt_load_transport(string);
2cf7ff7a 1433 break;
bf0fd768 1434 default:
f45663ce
CL		 1435 dfprintk(MOUNT, "NFS: unrecognized "
1436 "transport protocol\n");
4223a4a1 1437 kfree(string);
d23c45fd 1438 return 0;
bf0fd768 1439 }
c5cb09b6 1440 kfree(string);
bf0fd768
CL		 1441 break;
1442 case Opt_mountproto:
1443 string = match_strdup(args);
1444 if (string == NULL)
1445 goto out_nomem;
1446 token = match_token(string,
1447 nfs_xprt_protocol_tokens, args);
d508afb4 1448 kfree(string);
bf0fd768 1449
ee671b01 1450 mountfamily = AF_INET;
bf0fd768 1451 switch (token) {
ee671b01
JL		 1452 case Opt_xprt_udp6:
1453 mountfamily = AF_INET6;
fdb66ff4 1454 case Opt_xprt_udp:
0896a725 1455 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1456 break;
ee671b01
JL		 1457 case Opt_xprt_tcp6:
1458 mountfamily = AF_INET6;
fdb66ff4 1459 case Opt_xprt_tcp:
0896a725 1460 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1461 break;
2cf7ff7a 1462 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1463 default:
f45663ce
CL		 1464 dfprintk(MOUNT, "NFS: unrecognized "
1465 "transport protocol\n");
d23c45fd 1466 return 0;
bf0fd768
CL		 1467 }
1468 break;
1469 case Opt_addr:
1470 string = match_strdup(args);
1471 if (string == NULL)
1472 goto out_nomem;
53a0b9c4 1473 mnt->nfs_server.addrlen =
b48e1278 1474 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1475 (struct sockaddr *)
1476 &mnt->nfs_server.address,
1477 sizeof(mnt->nfs_server.address));
bf0fd768 1478 kfree(string);
53a0b9c4
CL		 1479 if (mnt->nfs_server.addrlen == 0)
1480 goto out_invalid_address;
bf0fd768
CL		 1481 break;
1482 case Opt_clientaddr:
c5cb09b6 1483 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1484 goto out_nomem;
bf0fd768 1485 break;
33832034 1486 case Opt_mounthost:
c5cb09b6
RL		 1487 if (nfs_get_option_str(args,
1488 &mnt->mount_server.hostname))
33832034 1489 goto out_nomem;
33832034 1490 break;
0ac83779 1491 case Opt_mountaddr:
bf0fd768
CL		 1492 string = match_strdup(args);
1493 if (string == NULL)
1494 goto out_nomem;
53a0b9c4 1495 mnt->mount_server.addrlen =
b48e1278 1496 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1497 (struct sockaddr *)
1498 &mnt->mount_server.address,
1499 sizeof(mnt->mount_server.address));
bf0fd768 1500 kfree(string);
53a0b9c4
CL		 1501 if (mnt->mount_server.addrlen == 0)
1502 goto out_invalid_address;
bf0fd768 1503 break;
7973c1f1
TM		 1504 case Opt_lookupcache:
1505 string = match_strdup(args);
1506 if (string == NULL)
1507 goto out_nomem;
1508 token = match_token(string,
1509 nfs_lookupcache_tokens, args);
1510 kfree(string);
1511 switch (token) {
1512 case Opt_lookupcache_all:
1513 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1514 break;
1515 case Opt_lookupcache_positive:
1516 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1517 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1518 break;
1519 case Opt_lookupcache_none:
1520 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1521 break;
1522 default:
7973c1f1
TM		 1523 dfprintk(MOUNT, "NFS: invalid "
1524 "lookupcache argument\n");
d23c45fd 1525 return 0;
7973c1f1
TM		 1526 };
1527 break;
a6d5ff64 1528 case Opt_fscache_uniq:
c5cb09b6 1529 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1530 goto out_nomem;
a6d5ff64
CL		 1531 mnt->options |= NFS_OPTION_FSCACHE;
1532 break;
5eebde23
SJ		 1533 case Opt_local_lock:
1534 string = match_strdup(args);
1535 if (string == NULL)
1536 goto out_nomem;
1537 token = match_token(string, nfs_local_lock_tokens,
1538 args);
1539 kfree(string);
1540 switch (token) {
1541 case Opt_local_lock_all:
1542 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1543 NFS_MOUNT_LOCAL_FCNTL);
1544 break;
1545 case Opt_local_lock_flock:
1546 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1547 break;
1548 case Opt_local_lock_posix:
1549 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1550 break;
1551 case Opt_local_lock_none:
1552 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1553 NFS_MOUNT_LOCAL_FCNTL);
1554 break;
1555 default:
1556 dfprintk(MOUNT, "NFS: invalid "
1557 "local_lock argument\n");
1558 return 0;
1559 };
1560 break;
bf0fd768 1561
f45663ce
CL		 1562 /*
1563 * Special options
1564 */
1565 case Opt_sloppy:
1566 sloppy = 1;
1567 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1568 break;
bf0fd768
CL		 1569 case Opt_userspace:
1570 case Opt_deprecated:
d33e4dfe
CL		 1571 dfprintk(MOUNT, "NFS: ignoring mount option "
1572 "'%s'\n", p);
bf0fd768
CL		 1573 break;
1574
1575 default:
d23c45fd 1576 invalid_option = 1;
f45663ce
CL		 1577 dfprintk(MOUNT, "NFS: unrecognized mount option "
1578 "'%s'\n", p);
bf0fd768
CL		 1579 }
1580 }
1581
d23c45fd
CL		 1582 if (!sloppy && invalid_option)
1583 return 0;
1584
571b7554
WAA		 1585 if (mnt->minorversion && mnt->version != 4)
1586 goto out_minorversion_mismatch;
1587
ee671b01
JL		 1588 /*
1589 * verify that any proto=/mountproto= options match the address
1590 * familiies in the addr=/mountaddr= options.
1591 */
1592 if (protofamily != AF_UNSPEC &&
1593 protofamily != mnt->nfs_server.address.ss_family)
1594 goto out_proto_mismatch;
1595
1596 if (mountfamily != AF_UNSPEC) {
1597 if (mnt->mount_server.addrlen) {
1598 if (mountfamily != mnt->mount_server.address.ss_family)
1599 goto out_mountproto_mismatch;
1600 } else {
1601 if (mountfamily != mnt->nfs_server.address.ss_family)
1602 goto out_mountproto_mismatch;
1603 }
1604 }
1605
bf0fd768
CL		 1606 return 1;
1607
ee671b01
JL		 1608out_mountproto_mismatch:
1609 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1610 "option\n");
1611 return 0;
1612out_proto_mismatch:
1613 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1614 return 0;
53a0b9c4
CL		 1615out_invalid_address:
1616 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1617 return 0;
d23c45fd 1618out_invalid_value:
53a0b9c4 1619 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1620 return 0;
571b7554
WAA		 1621out_minorversion_mismatch:
1622 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1623 "minorversion=%u\n", mnt->version, mnt->minorversion);
1624 return 0;
bf0fd768
CL		 1625out_nomem:
1626 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1627 return 0;
f9c3a380
EP		 1628out_security_failure:
1629 free_secdata(secdata);
1630 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1631 return 0;
bf0fd768
CL		 1632}
1633
ec88f28d
CL		 1634/*
1635 * Match the requested auth flavors with the list returned by
1636 * the server. Returns zero and sets the mount's authentication
1637 * flavor on success; returns -EACCES if server does not support
1638 * the requested flavor.
1639 */
1640static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1641 struct nfs_mount_request *request)
1642{
1643 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1644
5eecfde6
CL		 1645 /*
1646 * Certain releases of Linux's mountd return an empty
1647 * flavor list. To prevent behavioral regression with
1648 * these servers (ie. rejecting mounts that used to
1649 * succeed), revert to pre-2.6.32 behavior (no checking)
1650 * if the returned flavor list is empty.
1651 */
1652 if (server_authlist_len == 0)
1653 return 0;
1654
ec88f28d
CL		 1655 /*
1656 * We avoid sophisticated negotiating here, as there are
1657 * plenty of cases where we can get it wrong, providing
1658 * either too little or too much security.
1659 *
1660 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1661 * flavor listed first. However, some servers list
1662 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1663 * preferred default, in args->auth_flavors[0] if user
1664 * didn't specify sec= mount option.
1665 */
1666 for (i = 0; i < args->auth_flavor_len; i++)
1667 for (j = 0; j < server_authlist_len; j++)
1668 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1669 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1670 request->auth_flavs[j]);
1671 args->auth_flavors[0] = request->auth_flavs[j];
1672 return 0;
1673 }
1674
1675 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1676 nfs_umount(request);
1677 return -EACCES;
1678}
1679
0076d7b7
CL		 1680/*
1681 * Use the remote server's MOUNT service to request the NFS file handle
1682 * corresponding to the provided path.
1683 */
1684static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1685 struct nfs_fh *root_fh)
1686{
ec88f28d
CL		 1687 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1688 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1689 struct nfs_mount_request request = {
1690 .sap = (struct sockaddr *)
1691 &args->mount_server.address,
1692 .dirpath = args->nfs_server.export_path,
1693 .protocol = args->mount_server.protocol,
1694 .fh = root_fh,
50a737f8 1695 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1696 .auth_flav_len = &server_authlist_len,
1697 .auth_flavs = server_authlist,
6d59b8d5 1698 .net = args->net,
c5d120f8 1699 };
4c568017 1700 int status;
0076d7b7
CL		 1701
1702 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1703 switch (args->version) {
1704 default:
1705 args->mount_server.version = NFS_MNT3_VERSION;
1706 break;
1707 case 2:
1708 args->mount_server.version = NFS_MNT_VERSION;
1709 }
0076d7b7 1710 }
c5d120f8 1711 request.version = args->mount_server.version;
0076d7b7 1712
33832034 1713 if (args->mount_server.hostname)
c5d120f8 1714 request.hostname = args->mount_server.hostname;
33832034 1715 else
c5d120f8 1716 request.hostname = args->nfs_server.hostname;
33832034 1717
0076d7b7
CL		 1718 /*
1719 * Construct the mount server's address.
1720 */
4c568017 1721 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1722 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1723 args->nfs_server.addrlen);
1724 args->mount_server.addrlen = args->nfs_server.addrlen;
1725 }
c5d120f8 1726 request.salen = args->mount_server.addrlen;
f5855fec 1727 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1728
1729 /*
1730 * Now ask the mount server to map our export path
1731 * to a file handle.
1732 */
c5d120f8 1733 status = nfs_mount(&request);
ec88f28d
CL		 1734 if (status != 0) {
1735 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1736 request.hostname, status);
1737 return status;
1738 }
0076d7b7 1739
ec88f28d
CL		 1740 /*
1741 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1742 */
1743 if (args->mount_server.version != NFS_MNT3_VERSION)
1744 return 0;
1745 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1746}
1747
c12bacec
RL		 1748/*
1749 * Split "dev_name" into "hostname:export_path".
1750 *
1751 * The leftmost colon demarks the split between the server's hostname
1752 * and the export path. If the hostname starts with a left square
1753 * bracket, then it may contain colons.
1754 *
1755 * Note: caller frees hostname and export path, even on error.
1756 */
1757static int nfs_parse_devname(const char *dev_name,
1758 char **hostname, size_t maxnamlen,
1759 char **export_path, size_t maxpathlen)
dc045898
CL		 1760{
1761 size_t len;
c12bacec 1762 char *end;
dc045898 1763
c12bacec
RL		 1764 /* Is the host name protected with square brakcets? */
1765 if (*dev_name == '[') {
1766 end = strchr(++dev_name, ']');
1767 if (end == NULL || end[1] != ':')
dc045898 1768 goto out_bad_devname;
dc045898 1769
c12bacec
RL		 1770 len = end - dev_name;
1771 end++;
1772 } else {
1773 char *comma;
dc045898 1774
c12bacec
RL		 1775 end = strchr(dev_name, ':');
1776 if (end == NULL)
1777 goto out_bad_devname;
1778 len = end - dev_name;
d1aa0825 1779
c12bacec
RL		 1780 /* kill possible hostname list: not supported */
1781 comma = strchr(dev_name, ',');
1782 if (comma != NULL && comma < end)
1783 *comma = 0;
1784 }
d1aa0825 1785
d1aa0825
CL		 1786 if (len > maxnamlen)
1787 goto out_hostname;
1788
1789 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1790 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1791 if (*hostname == NULL)
1792 goto out_nomem;
c12bacec 1793 len = strlen(++end);
d1aa0825
CL		 1794 if (len > maxpathlen)
1795 goto out_path;
1796 *export_path = kstrndup(end, len, GFP_KERNEL);
1797 if (!*export_path)
1798 goto out_nomem;
1799
c12bacec 1800 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1801 return 0;
1802
1803out_bad_devname:
1804 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1805 return -EINVAL;
1806
1807out_nomem:
1808 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1809 return -ENOMEM;
1810
1811out_hostname:
1812 dfprintk(MOUNT, "NFS: server hostname too long\n");
1813 return -ENAMETOOLONG;
1814
1815out_path:
1816 dfprintk(MOUNT, "NFS: export pathname too long\n");
1817 return -ENAMETOOLONG;
1818}
1819
f7b422b1 1820/*
54ceac45
DH		 1821 * Validate the NFS2/NFS3 mount data
1822 * - fills in the mount root filehandle
136d558c
CL		 1823 *
1824 * For option strings, user space handles the following behaviors:
1825 *
1826 * + DNS: mapping server host name to IP address ("addr=" option)
1827 *
1828 * + failure mode: how to behave if a mount request can't be handled
1829 * immediately ("fg/bg" option)
1830 *
1831 * + retry: how often to retry a mount request ("retry=" option)
1832 *
1833 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1834 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1835 */
2283f8d6
TT		 1836static int nfs_validate_mount_data(void *options,
1837 struct nfs_parsed_mount_data *args,
136d558c
CL		 1838 struct nfs_fh *mntfh,
1839 const char *dev_name)
f7b422b1 1840{
2283f8d6 1841 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1842 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1843
5df36e78
CL		 1844 if (data == NULL)
1845 goto out_no_data;
f7b422b1 1846
54ceac45 1847 switch (data->version) {
5df36e78
CL		 1848 case 1:
1849 data->namlen = 0;
1850 case 2:
1851 data->bsize = 0;
1852 case 3:
1853 if (data->flags & NFS_MOUNT_VER3)
1854 goto out_no_v3;
1855 data->root.size = NFS2_FHSIZE;
1856 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1857 case 4:
1858 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1859 goto out_no_sec;
1860 case 5:
1861 memset(data->context, 0, sizeof(data->context));
1862 case 6:
b7e24457
TM		 1863 if (data->flags & NFS_MOUNT_VER3) {
1864 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1865 goto out_invalid_fh;
5df36e78 1866 mntfh->size = data->root.size;
764302cc
CL		 1867 args->version = 3;
1868 } else {
5df36e78 1869 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1870 args->version = 2;
1871 }
5df36e78 1872
5df36e78
CL		 1873
1874 memcpy(mntfh->data, data->root.data, mntfh->size);
1875 if (mntfh->size < sizeof(mntfh->data))
1876 memset(mntfh->data + mntfh->size, 0,
1877 sizeof(mntfh->data) - mntfh->size);
6e88e061 1878
2283f8d6
TT		 1879 /*
1880 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1881 * can deal with.
1882 */
ff3525a5 1883 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1884 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1885 args->rsize = data->rsize;
1886 args->wsize = data->wsize;
2283f8d6
TT		 1887 args->timeo = data->timeo;
1888 args->retrans = data->retrans;
1889 args->acregmin = data->acregmin;
1890 args->acregmax = data->acregmax;
1891 args->acdirmin = data->acdirmin;
1892 args->acdirmax = data->acdirmax;
4c568017 1893
4cfd74fc 1894 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1895 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1896 if (!nfs_verify_server_address(sap))
4c568017
CL		 1897 goto out_no_address;
1898
2283f8d6 1899 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1900 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1901 /* N.B. caller will free nfs_server.hostname in all cases */
1902 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1903 args->namlen = data->namlen;
1904 args->bsize = data->bsize;
dd07c947
CL		 1905
1906 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1907 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1908 if (!args->nfs_server.hostname)
1909 goto out_nomem;
f9c3a380 1910
5eebde23
SJ		 1911 if (!(data->flags & NFS_MOUNT_NONLM))
1912 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1913 NFS_MOUNT_LOCAL_FCNTL);
1914 else
1915 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1916 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1917 /*
1918 * The legacy version 6 binary mount data from userspace has a
1919 * field used only to transport selinux information into the
1920 * the kernel. To continue to support that functionality we
1921 * have a touch of selinux knowledge here in the NFS code. The
1922 * userspace code converted context=blah to just blah so we are
1923 * converting back to the full string selinux understands.
1924 */
1925 if (data->context[0]){
1926#ifdef CONFIG_SECURITY_SELINUX
1927 int rc;
1928 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1929 if (!opts_str)
1930 return -ENOMEM;
1931 strcpy(opts_str, "context=");
1932 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1933 strcat(opts_str, &data->context[0]);
1934 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1935 kfree(opts_str);
1936 if (rc)
1937 return rc;
1938#else
1939 return -EINVAL;
1940#endif
1941 }
1942
5df36e78 1943 break;
136d558c 1944 default: {
136d558c 1945 int status;
136d558c 1946
2283f8d6
TT		 1947 if (nfs_parse_mount_options((char *)options, args) == 0)
1948 return -EINVAL;
136d558c 1949
4cfd74fc 1950 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1951 goto out_no_address;
1952
764302cc
CL		 1953 if (args->version == 4)
1954#ifdef CONFIG_NFS_V4
1955 return nfs4_validate_text_mount_data(options,
1956 args, dev_name);
1957#else
1958 goto out_v4_not_compiled;
1959#endif
1960
f5855fec 1961 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1962
259875ef
TM		 1963 nfs_set_mount_transport_protocol(args);
1964
dc045898
CL		 1965 status = nfs_parse_devname(dev_name,
1966 &args->nfs_server.hostname,
1967 PAGE_SIZE,
1968 &args->nfs_server.export_path,
1969 NFS_MAXPATHLEN);
1970 if (!status)
1971 status = nfs_try_mount(args, mntfh);
136d558c 1972
dc045898
CL		 1973 kfree(args->nfs_server.export_path);
1974 args->nfs_server.export_path = NULL;
136d558c 1975
136d558c 1976 if (status)
fdc6e2c8 1977 return status;
136d558c 1978
136d558c
CL		 1979 break;
1980 }
f7b422b1 1981 }
54ceac45
DH		 1982
1983#ifndef CONFIG_NFS_V3
8a6e5deb 1984 if (args->version == 3)
5df36e78
CL		 1985 goto out_v3_not_compiled;
1986#endif /* !CONFIG_NFS_V3 */
f7b422b1 1987
5df36e78 1988 return 0;
f7b422b1 1989
5df36e78
CL		 1990out_no_data:
1991 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1992 return -EINVAL;
54ceac45 1993
5df36e78
CL		 1994out_no_v3:
1995 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1996 data->version);
1997 return -EINVAL;
f7b422b1 1998
5df36e78
CL		 1999out_no_sec:
2000 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2001 return -EINVAL;
2002
5df36e78
CL		 2003#ifndef CONFIG_NFS_V3
2004out_v3_not_compiled:
2005 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2006 return -EPROTONOSUPPORT;
2007#endif /* !CONFIG_NFS_V3 */
2008
764302cc
CL		 2009#ifndef CONFIG_NFS_V4
2010out_v4_not_compiled:
2011 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2012 return -EPROTONOSUPPORT;
2013#endif /* !CONFIG_NFS_V4 */
2014
63649bd7
CG		 2015out_nomem:
2016 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2017 return -ENOMEM;
2018
5df36e78
CL		 2019out_no_address:
2020 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2021 return -EINVAL;
2022
2023out_invalid_fh:
2024 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2025 return -EINVAL;
f7b422b1
DH		 2026}
2027
48b605f8
JL		 2028static int
2029nfs_compare_remount_data(struct nfs_server *nfss,
2030 struct nfs_parsed_mount_data *data)
2031{
2032 if (data->flags != nfss->flags ||
2033 data->rsize != nfss->rsize ||
2034 data->wsize != nfss->wsize ||
2035 data->retrans != nfss->client->cl_timeout->to_retries ||
2036 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2037 data->acregmin != nfss->acregmin / HZ ||
2038 data->acregmax != nfss->acregmax / HZ ||
2039 data->acdirmin != nfss->acdirmin / HZ ||
2040 data->acdirmax != nfss->acdirmax / HZ ||
2041 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2042 data->nfs_server.port != nfss->port ||
48b605f8 2043 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2044 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2045 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2046 return -EINVAL;
2047
2048 return 0;
2049}
2050
2051static int
2052nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2053{
2054 int error;
2055 struct nfs_server *nfss = sb->s_fs_info;
2056 struct nfs_parsed_mount_data *data;
2057 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2058 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2059 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2060
2061 /*
2062 * Userspace mount programs that send binary options generally send
2063 * them populated with default values. We have no way to know which
2064 * ones were explicitly specified. Fall back to legacy behavior and
2065 * just return success.
2066 */
31c94469
MZ		 2067 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2068 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2069 options->version <= 6))))
48b605f8
JL		 2070 return 0;
2071
2072 data = kzalloc(sizeof(*data), GFP_KERNEL);
2073 if (data == NULL)
2074 return -ENOMEM;
2075
2076 /* fill out struct with values from existing mount */
2077 data->flags = nfss->flags;
2078 data->rsize = nfss->rsize;
2079 data->wsize = nfss->wsize;
2080 data->retrans = nfss->client->cl_timeout->to_retries;
2081 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2082 data->acregmin = nfss->acregmin / HZ;
2083 data->acregmax = nfss->acregmax / HZ;
2084 data->acdirmin = nfss->acdirmin / HZ;
2085 data->acdirmax = nfss->acdirmax / HZ;
2086 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2087 data->nfs_server.port = nfss->port;
48b605f8
JL		 2088 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2089 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2090 data->nfs_server.addrlen);
2091
2092 /* overwrite those values with any that were specified */
2093 error = nfs_parse_mount_options((char *)options, data);
2094 if (error < 0)
2095 goto out;
2096
26c4c170
JL		 2097 /*
2098 * noac is a special case. It implies -o sync, but that's not
2099 * necessarily reflected in the mtab options. do_remount_sb
2100 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2101 * remount options, so we have to explicitly reset it.
2102 */
2103 if (data->flags & NFS_MOUNT_NOAC)
2104 *flags |= MS_SYNCHRONOUS;
2105
48b605f8
JL		 2106 /* compare new mount options with old ones */
2107 error = nfs_compare_remount_data(nfss, data);
2108out:
2109 kfree(data);
2110 return error;
2111}
2112
f7b422b1 2113/*
54ceac45 2114 * Initialise the common bits of the superblock
f7b422b1 2115 */
54ceac45 2116static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2117{
54ceac45 2118 struct nfs_server *server = NFS_SB(sb);
5006a76c 2119
54ceac45 2120 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2121
54ceac45
DH		 2122 /* We probably want something more informative here */
2123 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2124 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2125
54ceac45
DH		 2126 if (sb->s_blocksize == 0)
2127 sb->s_blocksize = nfs_block_bits(server->wsize,
2128 &sb->s_blocksize_bits);
f7b422b1 2129
32a88aa1
JA		 2130 sb->s_bdi = &server->backing_dev_info;
2131
54ceac45 2132 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2133}
2134
2135/*
54ceac45 2136 * Finish setting up an NFS2/3 superblock
f7b422b1 2137 */
2283f8d6 2138static void nfs_fill_super(struct super_block *sb,
c40f8d1d 2139 struct nfs_mount_info *mount_info)
f7b422b1 2140{
c40f8d1d 2141 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2142 struct nfs_server *server = NFS_SB(sb);
5006a76c 2143
54ceac45
DH		 2144 sb->s_blocksize_bits = 0;
2145 sb->s_blocksize = 0;
2146 if (data->bsize)
2147 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2148
8a6e5deb 2149 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2150 /* The VFS shouldn't apply the umask to mode bits. We will do
2151 * so ourselves when necessary.
2152 */
2153 sb->s_flags |= MS_POSIXACL;
2154 sb->s_time_gran = 1;
816724e6 2155 }
54ceac45
DH		 2156
2157 sb->s_op = &nfs_sops;
2158 nfs_initialise_sb(sb);
f7b422b1
DH		 2159}
2160
2161/*
54ceac45 2162 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2163 */
54ceac45 2164static void nfs_clone_super(struct super_block *sb,
8c958e0c 2165 struct nfs_mount_info *mount_info)
f7b422b1 2166{
8c958e0c 2167 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2168 struct nfs_server *server = NFS_SB(sb);
2169
2170 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2171 sb->s_blocksize = old_sb->s_blocksize;
2172 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2173
8a6e5deb 2174 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2175 /* The VFS shouldn't apply the umask to mode bits. We will do
2176 * so ourselves when necessary.
f7b422b1
DH		 2177 */
2178 sb->s_flags |= MS_POSIXACL;
f7b422b1 2179 sb->s_time_gran = 1;
f7b422b1
DH		 2180 }
2181
54ceac45
DH		 2182 sb->s_op = old_sb->s_op;
2183 nfs_initialise_sb(sb);
f7b422b1
DH		 2184}
2185
275a5d24
TM		 2186static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2187{
2188 const struct nfs_server *a = s->s_fs_info;
2189 const struct rpc_clnt *clnt_a = a->client;
2190 const struct rpc_clnt *clnt_b = b->client;
2191
2192 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2193 goto Ebusy;
2194 if (a->nfs_client != b->nfs_client)
2195 goto Ebusy;
2196 if (a->flags != b->flags)
2197 goto Ebusy;
2198 if (a->wsize != b->wsize)
2199 goto Ebusy;
2200 if (a->rsize != b->rsize)
2201 goto Ebusy;
2202 if (a->acregmin != b->acregmin)
2203 goto Ebusy;
2204 if (a->acregmax != b->acregmax)
2205 goto Ebusy;
2206 if (a->acdirmin != b->acdirmin)
2207 goto Ebusy;
2208 if (a->acdirmax != b->acdirmax)
2209 goto Ebusy;
2210 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2211 goto Ebusy;
e89a5a43 2212 return 1;
275a5d24 2213Ebusy:
e89a5a43
TM		 2214 return 0;
2215}
2216
2217struct nfs_sb_mountdata {
2218 struct nfs_server *server;
2219 int mntflags;
2220};
2221
2222static int nfs_set_super(struct super_block *s, void *data)
2223{
2224 struct nfs_sb_mountdata *sb_mntdata = data;
2225 struct nfs_server *server = sb_mntdata->server;
2226 int ret;
2227
2228 s->s_flags = sb_mntdata->mntflags;
2229 s->s_fs_info = server;
8b244ff2 2230 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2231 ret = set_anon_super(s, server);
2232 if (ret == 0)
2233 server->s_dev = s->s_dev;
2234 return ret;
2235}
2236
fd00a8ff
CL		 2237static int nfs_compare_super_address(struct nfs_server *server1,
2238 struct nfs_server *server2)
2239{
2240 struct sockaddr *sap1, *sap2;
2241
2242 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2243 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2244
2245 if (sap1->sa_family != sap2->sa_family)
2246 return 0;
2247
2248 switch (sap1->sa_family) {
2249 case AF_INET: {
2250 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2251 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2252 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2253 return 0;
2254 if (sin1->sin_port != sin2->sin_port)
2255 return 0;
2256 break;
2257 }
2258 case AF_INET6: {
2259 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2260 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2261 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2262 return 0;
2263 if (sin1->sin6_port != sin2->sin6_port)
2264 return 0;
2265 break;
2266 }
2267 default:
2268 return 0;
2269 }
2270
2271 return 1;
2272}
2273
e89a5a43
TM		 2274static int nfs_compare_super(struct super_block *sb, void *data)
2275{
2276 struct nfs_sb_mountdata *sb_mntdata = data;
2277 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2278 int mntflags = sb_mntdata->mntflags;
2279
fd00a8ff 2280 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2281 return 0;
2282 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2283 if (old->flags & NFS_MOUNT_UNSHARED)
2284 return 0;
2285 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2286 return 0;
2287 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2288}
2289
2311b943
BS		 2290static void nfs_get_cache_cookie(struct super_block *sb,
2291 struct nfs_parsed_mount_data *parsed,
2292 struct nfs_clone_mount *cloned)
2293{
2294 char *uniq = NULL;
2295 int ulen = 0;
2296
2297 if (parsed && parsed->fscache_uniq) {
2298 uniq = parsed->fscache_uniq;
2299 ulen = strlen(parsed->fscache_uniq);
2300 } else if (cloned) {
2301 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2302 if (mnt_s->fscache_key) {
2303 uniq = mnt_s->fscache_key->key.uniquifier;
2304 ulen = mnt_s->fscache_key->key.uniq_len;
2305 };
2306 }
2307
2308 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2309}
2310
fa799759
MS		 2311static int nfs_bdi_register(struct nfs_server *server)
2312{
2313 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2314}
2315
3d176e3f
BS		 2316static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2317 struct nfs_mount_info *mount_info)
2318{
2319 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2320}
2321
2322static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2323 struct nfs_mount_info *mount_info)
2324{
2325 /* clone any lsm security options from the parent to the new sb */
2326 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2327 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2328 return -ESTALE;
2329 return 0;
2330}
2331
c40f8d1d
BS		 2332static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2333 struct nfs_server *server,
2334 int flags, const char *dev_name,
2335 struct nfs_fh *mntfh,
2336 struct nfs_mount_info *mount_info)
f7b422b1 2337{
f7b422b1 2338 struct super_block *s;
01194981 2339 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2340 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2341 struct nfs_sb_mountdata sb_mntdata = {
2342 .mntflags = flags,
c40f8d1d 2343 .server = server,
e89a5a43 2344 };
01194981 2345 int error;
33852a1f 2346
75180df2
TM		 2347 if (server->flags & NFS_MOUNT_UNSHARED)
2348 compare_super = NULL;
2349
fb2088cc
SP		 2350 /* -o noac implies -o sync */
2351 if (server->flags & NFS_MOUNT_NOAC)
2352 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2353
54ceac45 2354 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2355 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2356 if (IS_ERR(s)) {
01194981 2357 mntroot = ERR_CAST(s);
54ceac45 2358 goto out_err_nosb;
816724e6
TM		 2359 }
2360
54ceac45
DH		 2361 if (s->s_fs_info != server) {
2362 nfs_free_server(server);
2363 server = NULL;
fa799759
MS		 2364 } else {
2365 error = nfs_bdi_register(server);
01194981
AV		 2366 if (error) {
2367 mntroot = ERR_PTR(error);
cfbc0683 2368 goto error_splat_bdi;
01194981 2369 }
54ceac45 2370 }
f7b422b1 2371
54ceac45
DH		 2372 if (!s->s_root) {
2373 /* initial superblock/root creation */
c40f8d1d 2374 mount_info->fill_super(s, mount_info);
3d176e3f 2375 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2376 }
f7b422b1 2377
0d5839ad 2378 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2379 if (IS_ERR(mntroot))
54ceac45 2380 goto error_splat_super;
816724e6 2381
3d176e3f 2382 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2383 if (error)
2384 goto error_splat_root;
2385
54ceac45 2386 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2387
2388out:
01194981 2389 return mntroot;
816724e6 2390
54ceac45
DH		 2391out_err_nosb:
2392 nfs_free_server(server);
0655960f 2393 goto out;
54ceac45 2394
f9c3a380
EP		 2395error_splat_root:
2396 dput(mntroot);
01194981 2397 mntroot = ERR_PTR(error);
54ceac45 2398error_splat_super:
cfbc0683
N		 2399 if (server && !s->s_root)
2400 bdi_unregister(&server->backing_dev_info);
2401error_splat_bdi:
6f5bbff9 2402 deactivate_locked_super(s);
0655960f 2403 goto out;
f7b422b1
DH		 2404}
2405
c40f8d1d
BS		 2406static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2407 int flags, const char *dev_name, void *raw_data)
2408{
2409 struct nfs_server *server;
2410 struct nfs_parsed_mount_data *data = NULL;
2411 struct nfs_mount_info mount_info = {
2412 .fill_super = nfs_fill_super,
3d176e3f 2413 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2414 };
2415 struct nfs_fh *mntfh;
2416 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2417 int error;
2418
2419 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
2420 mntfh = nfs_alloc_fhandle();
2421 if (data == NULL || mntfh == NULL)
2422 goto out;
2423
2424 /* Validate the mount data */
2425 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2426 if (error < 0) {
2427 mntroot = ERR_PTR(error);
2428 goto out;
2429 }
2430 mount_info.parsed = data;
2431
2432#ifdef CONFIG_NFS_V4
2433 if (data->version == 4) {
2434 mntroot = nfs4_try_mount(flags, dev_name, data);
2435 goto out;
2436 }
2437#endif /* CONFIG_NFS_V4 */
2438
2439 /* Get a volume representation */
2440 server = nfs_create_server(data, mntfh);
2441 if (IS_ERR(server)) {
2442 mntroot = ERR_CAST(server);
2443 goto out;
2444 }
2445
2446 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mntfh, &mount_info);
2447out:
2448 nfs_free_parsed_mount_data(data);
2449 nfs_free_fhandle(mntfh);
2450 return mntroot;
2451}
2452
387c149b
TM		 2453/*
2454 * Ensure that we unregister the bdi before kill_anon_super
2455 * releases the device name
2456 */
2457static void nfs_put_super(struct super_block *s)
2458{
2459 struct nfs_server *server = NFS_SB(s);
2460
2461 bdi_unregister(&server->backing_dev_info);
2462}
2463
54ceac45
DH		 2464/*
2465 * Destroy an NFS2/3 superblock
2466 */
f7b422b1
DH		 2467static void nfs_kill_super(struct super_block *s)
2468{
2469 struct nfs_server *server = NFS_SB(s);
2470
2471 kill_anon_super(s);
08734048 2472 nfs_fscache_release_super_cookie(s);
54ceac45 2473 nfs_free_server(server);
f7b422b1
DH		 2474}
2475
54ceac45 2476/*
8c958e0c 2477 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2478 */
31f43471 2479static struct dentry *
8c958e0c
BS		 2480nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2481 const char *dev_name, struct nfs_mount_info *mount_info)
f7b422b1 2482{
8c958e0c 2483 struct nfs_clone_mount *data = mount_info->cloned;
54ceac45 2484 struct nfs_server *server;
3d176e3f 2485 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45 2486 int error;
f7b422b1 2487
8c958e0c 2488 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2489
54ceac45 2490 /* create a new volume representation */
7e6eb683 2491 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2492 if (IS_ERR(server)) {
2493 error = PTR_ERR(server);
3d176e3f 2494 goto out_err;
4c1fe2f7 2495 }
f7b422b1 2496
3d176e3f 2497 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, data->fh, mount_info);
8c958e0c 2498 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2499out:
31f43471 2500 return mntroot;
24c8dbbb 2501
3d176e3f 2502out_err:
8c958e0c 2503 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2504 goto out;
f7b422b1
DH		 2505}
2506
8c958e0c
BS		 2507/*
2508 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2509 */
2510static struct dentry *
2511nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2512 const char *dev_name, void *raw_data)
2513{
2514 struct nfs_mount_info mount_info = {
2515 .fill_super = nfs_clone_super,
3d176e3f 2516 .set_security = nfs_clone_sb_security,
8c958e0c
BS		 2517 .cloned = raw_data,
2518 };
2519 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2520}
2521
54ceac45
DH		 2522#ifdef CONFIG_NFS_V4
2523
f7b422b1 2524/*
54ceac45 2525 * Finish setting up a cloned NFS4 superblock
f7b422b1 2526 */
54ceac45 2527static void nfs4_clone_super(struct super_block *sb,
8c958e0c 2528 struct nfs_mount_info *mount_info)
f7b422b1 2529{
8c958e0c 2530 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2531 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2532 sb->s_blocksize = old_sb->s_blocksize;
2533 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2534 sb->s_time_gran = 1;
54ceac45 2535 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2536 /*
2537 * The VFS shouldn't apply the umask to mode bits. We will do
2538 * so ourselves when necessary.
2539 */
2540 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2541 sb->s_xattr = old_sb->s_xattr;
2542 nfs_initialise_sb(sb);
f7b422b1
DH		 2543}
2544
54ceac45
DH		 2545/*
2546 * Set up an NFS4 superblock
2547 */
c40f8d1d
BS		 2548static void nfs4_fill_super(struct super_block *sb,
2549 struct nfs_mount_info *mount_info)
f7b422b1 2550{
54ceac45
DH		 2551 sb->s_time_gran = 1;
2552 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2553 /*
2554 * The VFS shouldn't apply the umask to mode bits. We will do
2555 * so ourselves when necessary.
2556 */
2557 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2558 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2559 nfs_initialise_sb(sb);
f7b422b1
DH		 2560}
2561
01c3f052
TM		 2562static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2563{
5eebde23
SJ		 2564 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2565 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2566}
2567
7630c852
CL		 2568static int nfs4_validate_text_mount_data(void *options,
2569 struct nfs_parsed_mount_data *args,
2570 const char *dev_name)
2571{
2572 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2573
f5855fec 2574 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2575
2576 nfs_validate_transport_protocol(args);
2577
2578 nfs4_validate_mount_flags(args);
2579
2ecda72b
TM		 2580 if (args->version != 4) {
2581 dfprintk(MOUNT,
2582 "NFS4: Illegal mount version\n");
2583 return -EINVAL;
2584 }
2585
7630c852
CL		 2586 if (args->auth_flavor_len > 1) {
2587 dfprintk(MOUNT,
2588 "NFS4: Too many RPC auth flavours specified\n");
2589 return -EINVAL;
2590 }
2591
7630c852
CL		 2592 return nfs_parse_devname(dev_name,
2593 &args->nfs_server.hostname,
2594 NFS4_MAXNAMLEN,
2595 &args->nfs_server.export_path,
2596 NFS4_MAXPATHLEN);
2597}
2598
f0768ebd
CL		 2599/*
2600 * Validate NFSv4 mount options
2601 */
91ea40b9
TT		 2602static int nfs4_validate_mount_data(void *options,
2603 struct nfs_parsed_mount_data *args,
2604 const char *dev_name)
f0768ebd 2605{
4cfd74fc 2606 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2607 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2608 char *c;
2609
2610 if (data == NULL)
2611 goto out_no_data;
2612
2613 switch (data->version) {
2614 case 1:
4c568017
CL		 2615 if (data->host_addrlen > sizeof(args->nfs_server.address))
2616 goto out_no_address;
2617 if (data->host_addrlen == 0)
f0768ebd 2618 goto out_no_address;
4c568017 2619 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2620 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2621 return -EFAULT;
4cfd74fc 2622 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2623 goto out_no_address;
2624
6738b251
CL		 2625 if (data->auth_flavourlen) {
2626 if (data->auth_flavourlen > 1)
2627 goto out_inval_auth;
20c71f5e 2628 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2629 data->auth_flavours,
20c71f5e 2630 sizeof(args->auth_flavors[0])))
f0768ebd 2631 return -EFAULT;
f0768ebd
CL		 2632 }
2633
2634 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2635 if (IS_ERR(c))
2636 return PTR_ERR(c);
91ea40b9 2637 args->nfs_server.hostname = c;
f0768ebd
CL		 2638
2639 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2640 if (IS_ERR(c))
2641 return PTR_ERR(c);
91ea40b9
TT		 2642 args->nfs_server.export_path = c;
2643 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2644
2645 c = strndup_user(data->client_addr.data, 16);
2646 if (IS_ERR(c))
2647 return PTR_ERR(c);
91ea40b9
TT		 2648 args->client_address = c;
2649
2650 /*
2651 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2652 * can deal with.
2653 */
2654
2655 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2656 args->rsize = data->rsize;
2657 args->wsize = data->wsize;
2658 args->timeo = data->timeo;
2659 args->retrans = data->retrans;
2660 args->acregmin = data->acregmin;
2661 args->acregmax = data->acregmax;
2662 args->acdirmin = data->acdirmin;
2663 args->acdirmax = data->acdirmax;
2664 args->nfs_server.protocol = data->proto;
259875ef 2665 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2666
2667 break;
7630c852 2668 default:
91ea40b9 2669 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2670 return -EINVAL;
2671
4cfd74fc 2672 if (!nfs_verify_server_address(sap))
80071225 2673 return -EINVAL;
dc045898 2674
7630c852 2675 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2676 }
2677
2678 return 0;
2679
2680out_no_data:
2681 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2682 return -EINVAL;
2683
2684out_inval_auth:
2685 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2686 data->auth_flavourlen);
2687 return -EINVAL;
2688
2689out_no_address:
2690 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2691 return -EINVAL;
f0768ebd
CL		 2692}
2693
54ceac45 2694/*
c02d7adf 2695 * Get the superblock for the NFS4 root partition
54ceac45 2696 */
31f43471
AV		 2697static struct dentry *
2698nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2699 const char *dev_name, void *raw_data)
f7b422b1 2700{
c40f8d1d
BS		 2701 struct nfs_mount_info mount_info = {
2702 .fill_super = nfs4_fill_super,
3d176e3f 2703 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2704 .parsed = raw_data,
2705 };
54ceac45 2706 struct nfs_server *server;
33852a1f 2707 struct nfs_fh *mntfh;
c40f8d1d 2708 struct dentry *mntroot = ERR_PTR(-ENOMEM);
33852a1f 2709
b157b06c 2710 mntfh = nfs_alloc_fhandle();
c40f8d1d 2711 if (mount_info.parsed == NULL || mntfh == NULL)
8a0d551a 2712 goto out;
f9c3a380 2713
54ceac45 2714 /* Get a volume representation */
c40f8d1d 2715 server = nfs4_create_server(mount_info.parsed, mntfh);
54ceac45 2716 if (IS_ERR(server)) {
c40f8d1d 2717 mntroot = ERR_CAST(server);
29eb981a 2718 goto out;
f7b422b1
DH		 2719 }
2720
c40f8d1d
BS		 2721 mntroot = nfs_fs_mount_common(fs_type, server, flags,
2722 dev_name, mntfh, &mount_info);
29eb981a
CL		 2723
2724out:
b157b06c 2725 nfs_free_fhandle(mntfh);
c40f8d1d 2726 return mntroot;
f7b422b1
DH		 2727}
2728
c02d7adf
TM		 2729static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2730 int flags, void *data, const char *hostname)
2731{
2732 struct vfsmount *root_mnt;
2733 char *root_devname;
2734 size_t len;
2735
98a2139f 2736 len = strlen(hostname) + 5;
c02d7adf
TM		 2737 root_devname = kmalloc(len, GFP_KERNEL);
2738 if (root_devname == NULL)
2739 return ERR_PTR(-ENOMEM);
98a2139f
JK		 2740 /* Does hostname needs to be enclosed in brackets? */
2741 if (strchr(hostname, ':'))
2742 snprintf(root_devname, len, "[%s]:/", hostname);
2743 else
2744 snprintf(root_devname, len, "%s:/", hostname);
c02d7adf
TM		 2745 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2746 kfree(root_devname);
2747 return root_mnt;
2748}
2749
ce587e07
TM		 2750struct nfs_referral_count {
2751 struct list_head list;
2752 const struct task_struct *task;
2753 unsigned int referral_count;
2754};
2755
2756static LIST_HEAD(nfs_referral_count_list);
2757static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2758
2759static struct nfs_referral_count *nfs_find_referral_count(void)
2760{
2761 struct nfs_referral_count *p;
2762
2763 list_for_each_entry(p, &nfs_referral_count_list, list) {
2764 if (p->task == current)
2765 return p;
2766 }
2767 return NULL;
2768}
2769
2770#define NFS_MAX_NESTED_REFERRALS 2
2771
2772static int nfs_referral_loop_protect(void)
2773{
2774 struct nfs_referral_count *p, *new;
2775 int ret = -ENOMEM;
2776
2777 new = kmalloc(sizeof(*new), GFP_KERNEL);
2778 if (!new)
2779 goto out;
2780 new->task = current;
2781 new->referral_count = 1;
2782
2783 ret = 0;
2784 spin_lock(&nfs_referral_count_list_lock);
2785 p = nfs_find_referral_count();
2786 if (p != NULL) {
2787 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2788 ret = -ELOOP;
2789 else
2790 p->referral_count++;
2791 } else {
2792 list_add(&new->list, &nfs_referral_count_list);
2793 new = NULL;
2794 }
2795 spin_unlock(&nfs_referral_count_list_lock);
2796 kfree(new);
2797out:
2798 return ret;
2799}
2800
2801static void nfs_referral_loop_unprotect(void)
2802{
2803 struct nfs_referral_count *p;
2804
2805 spin_lock(&nfs_referral_count_list_lock);
2806 p = nfs_find_referral_count();
2807 p->referral_count--;
2808 if (p->referral_count == 0)
2809 list_del(&p->list);
2810 else
2811 p = NULL;
2812 spin_unlock(&nfs_referral_count_list_lock);
2813 kfree(p);
2814}
2815
01194981
AV		 2816static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2817 const char *export_path)
c02d7adf 2818{
01194981 2819 struct dentry *dentry;
5352d3b6 2820 int err;
c02d7adf 2821
5352d3b6
AV		 2822 if (IS_ERR(root_mnt))
2823 return ERR_CAST(root_mnt);
2824
2825 err = nfs_referral_loop_protect();
2826 if (err) {
ea441d11 2827 mntput(root_mnt);
5352d3b6 2828 return ERR_PTR(err);
ea441d11 2829 }
c02d7adf 2830
ea441d11
AV		 2831 dentry = mount_subtree(root_mnt, export_path);
2832 nfs_referral_loop_unprotect();
c02d7adf 2833
01194981 2834 return dentry;
c02d7adf
TM		 2835}
2836
01194981
AV		 2837static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2838 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2839{
2840 char *export_path;
2841 struct vfsmount *root_mnt;
01194981 2842 struct dentry *res;
a6fe23be
CL		 2843
2844 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2845
2846 export_path = data->nfs_server.export_path;
2847 data->nfs_server.export_path = "/";
2848 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2849 data->nfs_server.hostname);
2850 data->nfs_server.export_path = export_path;
2851
5352d3b6 2852 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2853
01194981
AV		 2854 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2855 IS_ERR(res) ? PTR_ERR(res) : 0,
2856 IS_ERR(res) ? " [error]" : "");
2857 return res;
a6fe23be
CL		 2858}
2859
c02d7adf
TM		 2860/*
2861 * Get the superblock for an NFS4 mountpoint
2862 */
01194981
AV		 2863static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2864 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2865{
2866 struct nfs_parsed_mount_data *data;
c02d7adf 2867 int error = -ENOMEM;
01194981 2868 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2869
c5811dbd 2870 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2871 if (data == NULL)
8a0d551a 2872 goto out;
c02d7adf
TM		 2873
2874 /* Validate the mount data */
2875 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2876 if (error < 0) {
2877 res = ERR_PTR(error);
c02d7adf 2878 goto out;
01194981 2879 }
c02d7adf 2880
01194981
AV		 2881 res = nfs4_try_mount(flags, dev_name, data);
2882 if (IS_ERR(res))
2883 error = PTR_ERR(res);
c02d7adf
TM		 2884
2885out:
8a0d551a 2886 nfs_free_parsed_mount_data(data);
01194981 2887 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2888 error != 0 ? " [error]" : "");
01194981 2889 return res;
c02d7adf
TM		 2890}
2891
f7b422b1
DH		 2892static void nfs4_kill_super(struct super_block *sb)
2893{
2894 struct nfs_server *server = NFS_SB(sb);
2895
0f3e66c6 2896 dprintk("--> %s\n", __func__);
515d8611 2897 nfs_super_return_all_delegations(sb);
f7b422b1 2898 kill_anon_super(sb);
08734048 2899 nfs_fscache_release_super_cookie(sb);
54ceac45 2900 nfs_free_server(server);
0f3e66c6 2901 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2902}
2903
2904/*
54ceac45 2905 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2906 */
31f43471
AV		 2907static struct dentry *
2908nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2909 const char *dev_name, void *raw_data)
f7b422b1 2910{
8c958e0c
BS		 2911 struct nfs_mount_info mount_info = {
2912 .fill_super = nfs4_clone_super,
3d176e3f 2913 .set_security = nfs_clone_sb_security,
8c958e0c 2914 .cloned = raw_data,
e89a5a43 2915 };
8c958e0c 2916 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
f7b422b1
DH		 2917}
2918
31f43471
AV		 2919static struct dentry *
2920nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2921 const char *dev_name, void *raw_data)
f7b422b1 2922{
21e4b82e
BS		 2923 struct nfs_mount_info mount_info = {
2924 .fill_super = nfs4_fill_super,
2925 .set_security = nfs_clone_sb_security,
2926 .cloned = raw_data,
2927 };
54ceac45 2928 struct nfs_server *server;
21e4b82e 2929 struct dentry *mntroot = ERR_PTR(-ENOMEM);
4f727296 2930 struct nfs_fh *mntfh;
54ceac45
DH		 2931
2932 dprintk("--> nfs4_referral_get_sb()\n");
2933
4f727296 2934 mntfh = nfs_alloc_fhandle();
21e4b82e
BS		 2935 if (mount_info.cloned == NULL || mntfh == NULL)
2936 goto out;
4f727296 2937
54ceac45 2938 /* create a new volume representation */
21e4b82e 2939 server = nfs4_create_referral_server(mount_info.cloned, mntfh);
54ceac45 2940 if (IS_ERR(server)) {
21e4b82e
BS		 2941 mntroot = ERR_CAST(server);
2942 goto out;
e9cc6c23 2943 }
54ceac45 2944
21e4b82e
BS		 2945 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, mntfh, &mount_info);
2946out:
4f727296 2947 nfs_free_fhandle(mntfh);
31f43471 2948 return mntroot;
f7b422b1
DH		 2949}
2950
c02d7adf
TM		 2951/*
2952 * Create an NFS4 server record on referral traversal
2953 */
01194981
AV		 2954static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2955 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2956{
2957 struct nfs_clone_mount *data = raw_data;
2958 char *export_path;
2959 struct vfsmount *root_mnt;
01194981 2960 struct dentry *res;
c02d7adf 2961
01194981 2962 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 2963
2964 export_path = data->mnt_path;
2965 data->mnt_path = "/";
2966
2967 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2968 flags, data, data->hostname);
2969 data->mnt_path = export_path;
2970
5352d3b6 2971 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 2972 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2973 IS_ERR(res) ? PTR_ERR(res) : 0,
2974 IS_ERR(res) ? " [error]" : "");
2975 return res;
c02d7adf
TM		 2976}
2977
54ceac45 2978#endif /* CONFIG_NFS_V4 */
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