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NFS: Create a new nfs_try_mount()
[mirror_ubuntu-artful-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 *);
486aa699
BS		 293static struct dentry *nfs_fs_mount_common(struct file_system_type *,
294 struct nfs_server *, int, const char *, struct nfs_fh *,
295 struct nfs_mount_info *);
01194981
AV		 296static struct dentry *nfs_fs_mount(struct file_system_type *,
297 int, const char *, void *);
31f43471
AV		 298static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
299 int flags, const char *dev_name, void *raw_data);
387c149b 300static void nfs_put_super(struct super_block *);
f7b422b1 301static void nfs_kill_super(struct super_block *);
48b605f8 302static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 303
304static struct file_system_type nfs_fs_type = {
305 .owner = THIS_MODULE,
306 .name = "nfs",
01194981 307 .mount = nfs_fs_mount,
f7b422b1 308 .kill_sb = nfs_kill_super,
349457cc 309 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 310};
311
54ceac45 312struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 313 .owner = THIS_MODULE,
314 .name = "nfs",
31f43471 315 .mount = nfs_xdev_mount,
f7b422b1 316 .kill_sb = nfs_kill_super,
349457cc 317 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 318};
319
ee9b6d61 320static const struct super_operations nfs_sops = {
f7b422b1
DH		 321 .alloc_inode = nfs_alloc_inode,
322 .destroy_inode = nfs_destroy_inode,
323 .write_inode = nfs_write_inode,
387c149b 324 .put_super = nfs_put_super,
f7b422b1 325 .statfs = nfs_statfs,
b57922d9 326 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 327 .umount_begin = nfs_umount_begin,
328 .show_options = nfs_show_options,
c7f404b4
AV		 329 .show_devname = nfs_show_devname,
330 .show_path = nfs_show_path,
f7b422b1 331 .show_stats = nfs_show_stats,
48b605f8 332 .remount_fs = nfs_remount,
f7b422b1
DH		 333};
334
335#ifdef CONFIG_NFS_V4
7630c852
CL		 336static int nfs4_validate_text_mount_data(void *options,
337 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 338static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
339 struct nfs_parsed_mount_data *data);
340static struct dentry *nfs4_mount(struct file_system_type *fs_type,
341 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 342static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
344static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
01194981
AV		 346static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 348static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 350static void nfs4_kill_super(struct super_block *sb);
351
352static struct file_system_type nfs4_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
01194981 355 .mount = nfs4_mount,
f7b422b1 356 .kill_sb = nfs4_kill_super,
349457cc 357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 358};
359
c02d7adf
TM		 360static struct file_system_type nfs4_remote_fs_type = {
361 .owner = THIS_MODULE,
362 .name = "nfs4",
31f43471 363 .mount = nfs4_remote_mount,
c02d7adf
TM		 364 .kill_sb = nfs4_kill_super,
365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
366};
367
54ceac45 368struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 369 .owner = THIS_MODULE,
370 .name = "nfs4",
31f43471 371 .mount = nfs4_xdev_mount,
f7b422b1 372 .kill_sb = nfs4_kill_super,
349457cc 373 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 374};
375
c02d7adf
TM		 376static struct file_system_type nfs4_remote_referral_fs_type = {
377 .owner = THIS_MODULE,
378 .name = "nfs4",
31f43471 379 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 380 .kill_sb = nfs4_kill_super,
381 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
382};
383
54ceac45 384struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 385 .owner = THIS_MODULE,
386 .name = "nfs4",
01194981 387 .mount = nfs4_referral_mount,
f7b422b1 388 .kill_sb = nfs4_kill_super,
349457cc 389 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 390};
391
ee9b6d61 392static const struct super_operations nfs4_sops = {
f7b422b1
DH		 393 .alloc_inode = nfs_alloc_inode,
394 .destroy_inode = nfs_destroy_inode,
395 .write_inode = nfs_write_inode,
387c149b 396 .put_super = nfs_put_super,
f7b422b1 397 .statfs = nfs_statfs,
b57922d9 398 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 399 .umount_begin = nfs_umount_begin,
400 .show_options = nfs_show_options,
c7f404b4
AV		 401 .show_devname = nfs_show_devname,
402 .show_path = nfs_show_path,
f7b422b1 403 .show_stats = nfs_show_stats,
48b605f8 404 .remount_fs = nfs_remount,
f7b422b1
DH		 405};
406#endif
407
8e1f936b
RR		 408static struct shrinker acl_shrinker = {
409 .shrink = nfs_access_cache_shrinker,
410 .seeks = DEFAULT_SEEKS,
411};
979df72e 412
f7b422b1
DH		 413/*
414 * Register the NFS filesystems
415 */
416int __init register_nfs_fs(void)
417{
418 int ret;
419
420 ret = register_filesystem(&nfs_fs_type);
421 if (ret < 0)
422 goto error_0;
423
f7b422b1
DH		 424 ret = nfs_register_sysctl();
425 if (ret < 0)
426 goto error_1;
89a09141 427#ifdef CONFIG_NFS_V4
f7b422b1
DH		 428 ret = register_filesystem(&nfs4_fs_type);
429 if (ret < 0)
430 goto error_2;
431#endif
8e1f936b 432 register_shrinker(&acl_shrinker);
f7b422b1
DH		 433 return 0;
434
435#ifdef CONFIG_NFS_V4
436error_2:
437 nfs_unregister_sysctl();
89a09141 438#endif
f7b422b1
DH		 439error_1:
440 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 441error_0:
442 return ret;
443}
444
445/*
446 * Unregister the NFS filesystems
447 */
448void __exit unregister_nfs_fs(void)
449{
8e1f936b 450 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 451#ifdef CONFIG_NFS_V4
452 unregister_filesystem(&nfs4_fs_type);
f7b422b1 453#endif
49af7ee1 454 nfs_unregister_sysctl();
f7b422b1
DH		 455 unregister_filesystem(&nfs_fs_type);
456}
457
1daef0a8 458void nfs_sb_active(struct super_block *sb)
ef818a28 459{
1daef0a8 460 struct nfs_server *server = NFS_SB(sb);
ef818a28 461
1daef0a8
TM		 462 if (atomic_inc_return(&server->active) == 1)
463 atomic_inc(&sb->s_active);
ef818a28
SD		 464}
465
1daef0a8 466void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 467{
468 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 469
470 if (atomic_dec_and_test(&server->active))
471 deactivate_super(sb);
ef818a28
SD		 472}
473
f7b422b1
DH		 474/*
475 * Deliver file system statistics to userspace
476 */
816724e6 477static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 478{
0c7d90cf 479 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 480 unsigned char blockbits;
481 unsigned long blockres;
0c7d90cf 482 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 483 struct nfs_fsstat res;
484 int error = -ENOMEM;
485
486 res.fattr = nfs_alloc_fattr();
487 if (res.fattr == NULL)
488 goto out_err;
f7b422b1 489
8fa5c000 490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 491 if (unlikely(error == -ESTALE)) {
492 struct dentry *pd_dentry;
493
494 pd_dentry = dget_parent(dentry);
495 if (pd_dentry != NULL) {
496 nfs_zap_caches(pd_dentry->d_inode);
497 dput(pd_dentry);
498 }
499 }
ca7e9a0d 500 nfs_free_fattr(res.fattr);
f7b422b1
DH		 501 if (error < 0)
502 goto out_err;
ca7e9a0d 503
1a0ba9ae 504 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 505
506 /*
507 * Current versions of glibc do not correctly handle the
508 * case where f_frsize != f_bsize. Eventually we want to
509 * report the value of wtmult in this field.
510 */
0c7d90cf 511 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 512
513 /*
514 * On most *nix systems, f_blocks, f_bfree, and f_bavail
515 * are reported in units of f_frsize. Linux hasn't had
516 * an f_frsize field in its statfs struct until recently,
517 * thus historically Linux's sys_statfs reports these
518 * fields in units of f_bsize.
519 */
0c7d90cf
DH		 520 buf->f_bsize = dentry->d_sb->s_blocksize;
521 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 522 blockres = (1 << blockbits) - 1;
523 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
524 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
525 buf->f_bavail = (res.abytes + blockres) >> blockbits;
526
527 buf->f_files = res.tfiles;
528 buf->f_ffree = res.afiles;
529
530 buf->f_namelen = server->namelen;
1a0ba9ae 531
f7b422b1
DH		 532 return 0;
533
534 out_err:
3110ff80 535 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 536 return error;
f7b422b1
DH		 537}
538
7d4e2747
DH		 539/*
540 * Map the security flavour number to a name
541 */
81039f1f
TM		 542static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
543{
7d4e2747 544 static const struct {
81039f1f
TM		 545 rpc_authflavor_t flavour;
546 const char *str;
547 } sec_flavours[] = {
548 { RPC_AUTH_NULL, "null" },
549 { RPC_AUTH_UNIX, "sys" },
550 { RPC_AUTH_GSS_KRB5, "krb5" },
551 { RPC_AUTH_GSS_KRB5I, "krb5i" },
552 { RPC_AUTH_GSS_KRB5P, "krb5p" },
553 { RPC_AUTH_GSS_LKEY, "lkey" },
554 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
555 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
556 { RPC_AUTH_GSS_SPKM, "spkm" },
557 { RPC_AUTH_GSS_SPKMI, "spkmi" },
558 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 559 { UINT_MAX, "unknown" }
81039f1f
TM		 560 };
561 int i;
562
4d81cd16 563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 564 if (sec_flavours[i].flavour == flavour)
565 break;
566 }
567 return sec_flavours[i].str;
568}
569
ee671b01
JL		 570static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572{
573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
574
575 seq_printf(m, ",mountproto=");
576 switch (sap->sa_family) {
577 case AF_INET:
578 switch (nfss->mountd_protocol) {
579 case IPPROTO_UDP:
580 seq_printf(m, RPCBIND_NETID_UDP);
581 break;
582 case IPPROTO_TCP:
583 seq_printf(m, RPCBIND_NETID_TCP);
584 break;
585 default:
586 if (showdefaults)
587 seq_printf(m, "auto");
588 }
589 break;
590 case AF_INET6:
591 switch (nfss->mountd_protocol) {
592 case IPPROTO_UDP:
593 seq_printf(m, RPCBIND_NETID_UDP6);
594 break;
595 case IPPROTO_TCP:
596 seq_printf(m, RPCBIND_NETID_TCP6);
597 break;
598 default:
599 if (showdefaults)
600 seq_printf(m, "auto");
601 }
602 break;
603 default:
604 if (showdefaults)
605 seq_printf(m, "auto");
606 }
607}
608
82d101d5
CL		 609static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
610 int showdefaults)
611{
612 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
613
d5eff1a3
BS		 614 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
615 return;
616
82d101d5
CL		 617 switch (sap->sa_family) {
618 case AF_INET: {
619 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 620 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 621 break;
622 }
623 case AF_INET6: {
624 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 625 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 626 break;
627 }
628 default:
629 if (showdefaults)
630 seq_printf(m, ",mountaddr=unspecified");
631 }
632
633 if (nfss->mountd_version || showdefaults)
634 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 635 if ((nfss->mountd_port &&
636 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
637 showdefaults)
82d101d5
CL		 638 seq_printf(m, ",mountport=%u", nfss->mountd_port);
639
ee671b01 640 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 641}
642
0be8189f
TM		 643#ifdef CONFIG_NFS_V4
644static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
645 int showdefaults)
646{
647 struct nfs_client *clp = nfss->nfs_client;
648
649 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 650}
651#else
652static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
653 int showdefaults)
654{
655}
656#endif
657
7bbceb6f
TM		 658static void nfs_show_nfs_version(struct seq_file *m,
659 unsigned int version,
660 unsigned int minorversion)
661{
662 seq_printf(m, ",vers=%u", version);
663 if (version == 4)
664 seq_printf(m, ".%u", minorversion);
665}
666
f7b422b1
DH		 667/*
668 * Describe the mount options in force on this server representation
669 */
82d101d5
CL		 670static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
671 int showdefaults)
f7b422b1 672{
509de811 673 static const struct proc_nfs_info {
f7b422b1 674 int flag;
509de811
DH		 675 const char *str;
676 const char *nostr;
f7b422b1
DH		 677 } nfs_info[] = {
678 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 679 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 680 { NFS_MOUNT_NOCTO, ",nocto", "" },
681 { NFS_MOUNT_NOAC, ",noac", "" },
682 { NFS_MOUNT_NONLM, ",nolock", "" },
683 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 684 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 685 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
686 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 687 { 0, NULL, NULL }
688 };
509de811 689 const struct proc_nfs_info *nfs_infop;
8fa5c000 690 struct nfs_client *clp = nfss->nfs_client;
82d101d5 691 u32 version = clp->rpc_ops->version;
7c563cc9 692 int local_flock, local_fcntl;
f7b422b1 693
7bbceb6f 694 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 695 seq_printf(m, ",rsize=%u", nfss->rsize);
696 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 697 if (nfss->bsize != 0)
698 seq_printf(m, ",bsize=%u", nfss->bsize);
699 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 700 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 701 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 702 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 703 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 704 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 705 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 706 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 707 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 708 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
709 if (nfss->flags & nfs_infop->flag)
710 seq_puts(m, nfs_infop->str);
711 else
712 seq_puts(m, nfs_infop->nostr);
713 }
2446ab60 714 rcu_read_lock();
56928edd 715 seq_printf(m, ",proto=%s",
ee671b01 716 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 717 rcu_read_unlock();
82d101d5
CL		 718 if (version == 4) {
719 if (nfss->port != NFS_PORT)
720 seq_printf(m, ",port=%u", nfss->port);
721 } else
722 if (nfss->port)
723 seq_printf(m, ",port=%u", nfss->port);
724
33170233
TM		 725 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
726 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 727 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 728
729 if (version != 4)
730 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 731 else
732 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 733
b797cac7
DH		 734 if (nfss->options & NFS_OPTION_FSCACHE)
735 seq_printf(m, ",fsc");
9b00c643
PL		 736
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
739 seq_printf(m, ",lookupcache=none");
740 else
741 seq_printf(m, ",lookupcache=pos");
742 }
7c563cc9
SJ		 743
744 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
745 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
746
747 if (!local_flock && !local_fcntl)
748 seq_printf(m, ",local_lock=none");
749 else if (local_flock && local_fcntl)
750 seq_printf(m, ",local_lock=all");
751 else if (local_flock)
752 seq_printf(m, ",local_lock=flock");
753 else
754 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 755}
756
757/*
758 * Describe the mount options on this VFS mountpoint
759 */
34c80b1d 760static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 761{
34c80b1d 762 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 763
764 nfs_show_mount_options(m, nfss, 0);
765
2446ab60 766 rcu_read_lock();
5d8515ca
CL		 767 seq_printf(m, ",addr=%s",
768 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
769 RPC_DISPLAY_ADDR));
2446ab60 770 rcu_read_unlock();
f7b422b1
DH		 771
772 return 0;
773}
45402c38
HS		 774
775#ifdef CONFIG_NFS_V4
ae50c0b5 776#ifdef CONFIG_NFS_V4_1
45402c38 777static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 778{
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781}
782#else
45402c38
HS		 783static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784#endif
ae50c0b5
BF		 785#endif
786
787#ifdef CONFIG_NFS_V4_1
45402c38 788static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 789{
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795}
7e03b7cc
TM		 796
797static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798{
799 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806}
45402c38 807#else
7e03b7cc
TM		 808#ifdef CONFIG_NFS_V4
809static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810{
811}
45402c38 812#endif
7e03b7cc
TM		 813static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814{
815}
45402c38 816#endif
f7b422b1 817
d861c630 818static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 819{
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
d861c630 825 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832}
833
a6322de6 834static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 835{
836 seq_puts(m, "/");
837 return 0;
838}
839
f7b422b1
DH		 840/*
841 * Present statistical information for this VFS mountpoint
842 */
64132379 843static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 844{
845 int i, cpu;
64132379 846 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 847 struct rpc_auth *auth = nfss->client->cl_auth;
848 struct nfs_iostats totals = { };
849
850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
851
852 /*
853 * Display all mount option settings
854 */
855 seq_printf(m, "\n\topts:\t");
64132379
AV		 856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 860 nfs_show_mount_options(m, nfss, 1);
861
862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
863
7e03b7cc 864 show_implementation_id(m, nfss);
7d2ed9ac 865
f7b422b1
DH		 866 seq_printf(m, "\n\tcaps:\t");
867 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 868 seq_printf(m, ",wtmult=%u", nfss->wtmult);
869 seq_printf(m, ",dtsize=%u", nfss->dtsize);
870 seq_printf(m, ",bsize=%u", nfss->bsize);
871 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 872
873#ifdef CONFIG_NFS_V4
40c55319 874 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 875 seq_printf(m, "\n\tnfsv4:\t");
876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 879 show_sessions(m, nfss);
880 show_pnfs(m, nfss);
f7b422b1
DH		 881 }
882#endif
883
884 /*
885 * Display security flavor in effect for this mount
886 */
2d767432 887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 888 if (auth->au_flavor)
2d767432 889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 890
891 /*
892 * Display superblock I/O counters
893 */
894 for_each_possible_cpu(cpu) {
895 struct nfs_iostats *stats;
896
897 preempt_disable();
898 stats = per_cpu_ptr(nfss->io_stats, cpu);
899
900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
901 totals.events[i] += stats->events[i];
902 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
903 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 904#ifdef CONFIG_NFS_FSCACHE
905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
906 totals.fscache[i] += stats->fscache[i];
907#endif
f7b422b1
DH		 908
909 preempt_enable();
910 }
911
912 seq_printf(m, "\n\tevents:\t");
913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
914 seq_printf(m, "%lu ", totals.events[i]);
915 seq_printf(m, "\n\tbytes:\t");
916 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
917 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 918#ifdef CONFIG_NFS_FSCACHE
919 if (nfss->options & NFS_OPTION_FSCACHE) {
920 seq_printf(m, "\n\tfsc:\t");
921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
922 seq_printf(m, "%Lu ", totals.bytes[i]);
923 }
924#endif
f7b422b1
DH		 925 seq_printf(m, "\n");
926
927 rpc_print_iostats(m, nfss->client);
928
929 return 0;
930}
931
932/*
933 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 934 * in response to xdev traversals and referrals
f7b422b1 935 */
42faad99 936static void nfs_umount_begin(struct super_block *sb)
f7b422b1 937{
67e55205 938 struct nfs_server *server;
fc6ae3cf
TM		 939 struct rpc_clnt *rpc;
940
67e55205 941 server = NFS_SB(sb);
fc6ae3cf
TM		 942 /* -EIO all pending I/O */
943 rpc = server->client_acl;
944 if (!IS_ERR(rpc))
945 rpc_killall_tasks(rpc);
946 rpc = server->client;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
f7b422b1
DH		 949}
950
db833351 951static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 952{
953 struct nfs_parsed_mount_data *data;
954
955 data = kzalloc(sizeof(*data), GFP_KERNEL);
956 if (data) {
9423a08a
CL		 957 data->acregmin = NFS_DEF_ACREGMIN;
958 data->acregmax = NFS_DEF_ACREGMAX;
959 data->acdirmin = NFS_DEF_ACDIRMIN;
960 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 961 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 962 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 963 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 964 data->auth_flavors[0] = RPC_AUTH_UNIX;
965 data->auth_flavor_len = 1;
966 data->minorversion = 0;
9937347a 967 data->net = current->nsproxy->net_ns;
8a0d551a 968 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 969 }
970 return data;
971}
972
8a0d551a
JL		 973static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
974{
975 if (data) {
976 kfree(data->client_address);
977 kfree(data->mount_server.hostname);
978 kfree(data->nfs_server.export_path);
979 kfree(data->nfs_server.hostname);
980 kfree(data->fscache_uniq);
981 security_free_mnt_opts(&data->lsm_opts);
982 kfree(data);
983 }
984}
985
fc50d58f 986/*
cdcd7f9a
CL		 987 * Sanity-check a server address provided by the mount command.
988 *
989 * Address family must be initialized, and address must not be
990 * the ANY address for that family.
fc50d58f
CL		 991 */
992static int nfs_verify_server_address(struct sockaddr *addr)
993{
994 switch (addr->sa_family) {
995 case AF_INET: {
cdcd7f9a 996 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 997 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 998 }
999 case AF_INET6: {
1000 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1001 return !ipv6_addr_any(sa);
fc50d58f
CL		 1002 }
1003 }
1004
53a0b9c4 1005 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 1006 return 0;
1007}
1008
4cfd74fc
CL		 1009/*
1010 * Select between a default port value and a user-specified port value.
1011 * If a zero value is set, then autobind will be used.
1012 */
f5855fec 1013static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1014 const unsigned short default_port)
1015{
f5855fec
TM		 1016 if (*port == NFS_UNSPEC_PORT)
1017 *port = default_port;
4cfd74fc 1018
f5855fec 1019 rpc_set_port(sap, *port);
4cfd74fc
CL		 1020}
1021
259875ef
TM		 1022/*
1023 * Sanity check the NFS transport protocol.
1024 *
1025 */
1026static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1027{
1028 switch (mnt->nfs_server.protocol) {
1029 case XPRT_TRANSPORT_UDP:
1030 case XPRT_TRANSPORT_TCP:
1031 case XPRT_TRANSPORT_RDMA:
1032 break;
1033 default:
1034 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1035 }
1036}
1037
1038/*
1039 * For text based NFSv2/v3 mounts, the mount protocol transport default
1040 * settings should depend upon the specified NFS transport.
1041 */
1042static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1043{
1044 nfs_validate_transport_protocol(mnt);
1045
1046 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1047 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1048 return;
1049 switch (mnt->nfs_server.protocol) {
1050 case XPRT_TRANSPORT_UDP:
1051 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1052 break;
1053 case XPRT_TRANSPORT_TCP:
1054 case XPRT_TRANSPORT_RDMA:
1055 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1056 }
1057}
1058
01060c89
CL		 1059/*
1060 * Parse the value of the 'sec=' option.
01060c89
CL		 1061 */
1062static int nfs_parse_security_flavors(char *value,
1063 struct nfs_parsed_mount_data *mnt)
1064{
1065 substring_t args[MAX_OPT_ARGS];
1066
1067 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1068
1069 switch (match_token(value, nfs_secflavor_tokens, args)) {
1070 case Opt_sec_none:
01060c89
CL		 1071 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1072 break;
1073 case Opt_sec_sys:
01060c89
CL		 1074 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1075 break;
1076 case Opt_sec_krb5:
01060c89
CL		 1077 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1078 break;
1079 case Opt_sec_krb5i:
01060c89
CL		 1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1081 break;
1082 case Opt_sec_krb5p:
01060c89
CL		 1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1084 break;
1085 case Opt_sec_lkey:
01060c89
CL		 1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1087 break;
1088 case Opt_sec_lkeyi:
01060c89
CL		 1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1090 break;
1091 case Opt_sec_lkeyp:
01060c89
CL		 1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1093 break;
1094 case Opt_sec_spkm:
01060c89
CL		 1095 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1096 break;
1097 case Opt_sec_spkmi:
01060c89
CL		 1098 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1099 break;
1100 case Opt_sec_spkmp:
01060c89
CL		 1101 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1102 break;
1103 default:
1104 return 0;
1105 }
1106
9b7160c5 1107 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1108 mnt->auth_flavor_len = 1;
01060c89
CL		 1109 return 1;
1110}
1111
0d71b058
TM		 1112static int nfs_parse_version_string(char *string,
1113 struct nfs_parsed_mount_data *mnt,
1114 substring_t *args)
1115{
1116 mnt->flags &= ~NFS_MOUNT_VER3;
1117 switch (match_token(string, nfs_vers_tokens, args)) {
1118 case Opt_vers_2:
1119 mnt->version = 2;
1120 break;
1121 case Opt_vers_3:
1122 mnt->flags |= NFS_MOUNT_VER3;
1123 mnt->version = 3;
1124 break;
1125 case Opt_vers_4:
1126 /* Backward compatibility option. In future,
1127 * the mount program should always supply
1128 * a NFSv4 minor version number.
1129 */
1130 mnt->version = 4;
1131 break;
1132 case Opt_vers_4_0:
1133 mnt->version = 4;
1134 mnt->minorversion = 0;
1135 break;
1136 case Opt_vers_4_1:
1137 mnt->version = 4;
1138 mnt->minorversion = 1;
1139 break;
1140 default:
1141 return 0;
1142 }
1143 return 1;
1144}
1145
c5cb09b6
RL		 1146static int nfs_get_option_str(substring_t args[], char **option)
1147{
1148 kfree(*option);
1149 *option = match_strdup(args);
1150 return !option;
1151}
1152
1153static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1154{
1155 int rc;
1156 char *string;
1157
1158 string = match_strdup(args);
1159 if (string == NULL)
1160 return -ENOMEM;
1161 rc = strict_strtoul(string, 10, option);
1162 kfree(string);
1163
1164 return rc;
1165}
1166
bf0fd768
CL		 1167/*
1168 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1169 * a data structure. The whole mount string is processed; bad options are
1170 * skipped as they are encountered. If there were no errors, return 1;
1171 * otherwise return 0 (zero).
bf0fd768
CL		 1172 */
1173static int nfs_parse_mount_options(char *raw,
1174 struct nfs_parsed_mount_data *mnt)
1175{
f9c3a380 1176 char *p, *string, *secdata;
d23c45fd 1177 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1178 unsigned short protofamily = AF_UNSPEC;
1179 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1180
1181 if (!raw) {
1182 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1183 return 1;
1184 }
1185 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1186
f9c3a380
EP		 1187 secdata = alloc_secdata();
1188 if (!secdata)
1189 goto out_nomem;
1190
1191 rc = security_sb_copy_data(raw, secdata);
1192 if (rc)
1193 goto out_security_failure;
1194
1195 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1196 if (rc)
1197 goto out_security_failure;
1198
1199 free_secdata(secdata);
1200
bf0fd768
CL		 1201 while ((p = strsep(&raw, ",")) != NULL) {
1202 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1203 unsigned long option;
1204 int token;
bf0fd768
CL		 1205
1206 if (!*p)
1207 continue;
1208
1209 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1210
1211 token = match_token(p, nfs_mount_option_tokens, args);
1212 switch (token) {
f45663ce
CL		 1213
1214 /*
1215 * boolean options: foo/nofoo
1216 */
bf0fd768
CL		 1217 case Opt_soft:
1218 mnt->flags |= NFS_MOUNT_SOFT;
1219 break;
1220 case Opt_hard:
1221 mnt->flags &= ~NFS_MOUNT_SOFT;
1222 break;
bf0fd768
CL		 1223 case Opt_posix:
1224 mnt->flags |= NFS_MOUNT_POSIX;
1225 break;
1226 case Opt_noposix:
1227 mnt->flags &= ~NFS_MOUNT_POSIX;
1228 break;
1229 case Opt_cto:
1230 mnt->flags &= ~NFS_MOUNT_NOCTO;
1231 break;
1232 case Opt_nocto:
1233 mnt->flags |= NFS_MOUNT_NOCTO;
1234 break;
1235 case Opt_ac:
1236 mnt->flags &= ~NFS_MOUNT_NOAC;
1237 break;
1238 case Opt_noac:
1239 mnt->flags |= NFS_MOUNT_NOAC;
1240 break;
1241 case Opt_lock:
1242 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1243 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1244 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1245 break;
1246 case Opt_nolock:
1247 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1248 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1249 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1250 break;
bf0fd768
CL		 1251 case Opt_udp:
1252 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1253 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1254 break;
1255 case Opt_tcp:
1256 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1257 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1258 break;
2cf7ff7a
TT		 1259 case Opt_rdma:
1260 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1261 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1262 xprt_load_transport(p);
2cf7ff7a 1263 break;
bf0fd768
CL		 1264 case Opt_acl:
1265 mnt->flags &= ~NFS_MOUNT_NOACL;
1266 break;
1267 case Opt_noacl:
1268 mnt->flags |= NFS_MOUNT_NOACL;
1269 break;
1270 case Opt_rdirplus:
1271 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1272 break;
1273 case Opt_nordirplus:
1274 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1275 break;
75180df2
TM		 1276 case Opt_sharecache:
1277 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1278 break;
1279 case Opt_nosharecache:
1280 mnt->flags |= NFS_MOUNT_UNSHARED;
1281 break;
d740351b
CL		 1282 case Opt_resvport:
1283 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1284 break;
1285 case Opt_noresvport:
1286 mnt->flags |= NFS_MOUNT_NORESVPORT;
1287 break;
b797cac7
DH		 1288 case Opt_fscache:
1289 mnt->options |= NFS_OPTION_FSCACHE;
1290 kfree(mnt->fscache_uniq);
1291 mnt->fscache_uniq = NULL;
1292 break;
1293 case Opt_nofscache:
1294 mnt->options &= ~NFS_OPTION_FSCACHE;
1295 kfree(mnt->fscache_uniq);
1296 mnt->fscache_uniq = NULL;
1297 break;
bf0fd768 1298
f45663ce
CL		 1299 /*
1300 * options that take numeric values
1301 */
bf0fd768 1302 case Opt_port:
c5cb09b6
RL		 1303 if (nfs_get_option_ul(args, &option) ||
1304 option > USHRT_MAX)
d23c45fd
CL		 1305 goto out_invalid_value;
1306 mnt->nfs_server.port = option;
bf0fd768
CL		 1307 break;
1308 case Opt_rsize:
c5cb09b6 1309 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1310 goto out_invalid_value;
1311 mnt->rsize = option;
bf0fd768
CL		 1312 break;
1313 case Opt_wsize:
c5cb09b6 1314 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1315 goto out_invalid_value;
1316 mnt->wsize = option;
bf0fd768
CL		 1317 break;
1318 case Opt_bsize:
c5cb09b6 1319 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1320 goto out_invalid_value;
1321 mnt->bsize = option;
bf0fd768
CL		 1322 break;
1323 case Opt_timeo:
c5cb09b6 1324 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1325 goto out_invalid_value;
1326 mnt->timeo = option;
bf0fd768
CL		 1327 break;
1328 case Opt_retrans:
c5cb09b6 1329 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1330 goto out_invalid_value;
1331 mnt->retrans = option;
bf0fd768
CL		 1332 break;
1333 case Opt_acregmin:
c5cb09b6 1334 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1335 goto out_invalid_value;
1336 mnt->acregmin = option;
bf0fd768
CL		 1337 break;
1338 case Opt_acregmax:
c5cb09b6 1339 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1340 goto out_invalid_value;
1341 mnt->acregmax = option;
bf0fd768
CL		 1342 break;
1343 case Opt_acdirmin:
c5cb09b6 1344 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1345 goto out_invalid_value;
1346 mnt->acdirmin = option;
bf0fd768
CL		 1347 break;
1348 case Opt_acdirmax:
c5cb09b6 1349 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1350 goto out_invalid_value;
1351 mnt->acdirmax = option;
bf0fd768
CL		 1352 break;
1353 case Opt_actimeo:
c5cb09b6 1354 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1355 goto out_invalid_value;
1356 mnt->acregmin = mnt->acregmax =
1357 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1358 break;
1359 case Opt_namelen:
c5cb09b6 1360 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1361 goto out_invalid_value;
1362 mnt->namlen = option;
bf0fd768
CL		 1363 break;
1364 case Opt_mountport:
c5cb09b6
RL		 1365 if (nfs_get_option_ul(args, &option) ||
1366 option > USHRT_MAX)
d23c45fd
CL		 1367 goto out_invalid_value;
1368 mnt->mount_server.port = option;
bf0fd768 1369 break;
bf0fd768 1370 case Opt_mountvers:
c5cb09b6 1371 if (nfs_get_option_ul(args, &option) ||
f45663ce 1372 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1373 option > NFS_MNT3_VERSION)
1374 goto out_invalid_value;
1375 mnt->mount_server.version = option;
bf0fd768 1376 break;
3fd5be9e 1377 case Opt_minorversion:
c5cb09b6 1378 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1379 goto out_invalid_value;
1380 if (option > NFS4_MAX_MINOR_VERSION)
1381 goto out_invalid_value;
1382 mnt->minorversion = option;
3fd5be9e 1383 break;
bf0fd768 1384
f45663ce
CL		 1385 /*
1386 * options that take text values
1387 */
0d71b058
TM		 1388 case Opt_nfsvers:
1389 string = match_strdup(args);
1390 if (string == NULL)
1391 goto out_nomem;
1392 rc = nfs_parse_version_string(string, mnt, args);
1393 kfree(string);
1394 if (!rc)
1395 goto out_invalid_value;
1396 break;
bf0fd768
CL		 1397 case Opt_sec:
1398 string = match_strdup(args);
1399 if (string == NULL)
1400 goto out_nomem;
01060c89 1401 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1402 kfree(string);
f45663ce 1403 if (!rc) {
f45663ce
CL		 1404 dfprintk(MOUNT, "NFS: unrecognized "
1405 "security flavor\n");
d23c45fd 1406 return 0;
f45663ce 1407 }
bf0fd768
CL		 1408 break;
1409 case Opt_proto:
1410 string = match_strdup(args);
1411 if (string == NULL)
1412 goto out_nomem;
1413 token = match_token(string,
1414 nfs_xprt_protocol_tokens, args);
bf0fd768 1415
ee671b01 1416 protofamily = AF_INET;
bf0fd768 1417 switch (token) {
ee671b01
JL		 1418 case Opt_xprt_udp6:
1419 protofamily = AF_INET6;
fdb66ff4 1420 case Opt_xprt_udp:
bf0fd768 1421 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1422 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1423 break;
ee671b01
JL		 1424 case Opt_xprt_tcp6:
1425 protofamily = AF_INET6;
fdb66ff4 1426 case Opt_xprt_tcp:
bf0fd768 1427 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1428 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1429 break;
2cf7ff7a
TT		 1430 case Opt_xprt_rdma:
1431 /* vector side protocols to TCP */
1432 mnt->flags |= NFS_MOUNT_TCP;
1433 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1434 xprt_load_transport(string);
2cf7ff7a 1435 break;
bf0fd768 1436 default:
f45663ce
CL		 1437 dfprintk(MOUNT, "NFS: unrecognized "
1438 "transport protocol\n");
4223a4a1 1439 kfree(string);
d23c45fd 1440 return 0;
bf0fd768 1441 }
c5cb09b6 1442 kfree(string);
bf0fd768
CL		 1443 break;
1444 case Opt_mountproto:
1445 string = match_strdup(args);
1446 if (string == NULL)
1447 goto out_nomem;
1448 token = match_token(string,
1449 nfs_xprt_protocol_tokens, args);
d508afb4 1450 kfree(string);
bf0fd768 1451
ee671b01 1452 mountfamily = AF_INET;
bf0fd768 1453 switch (token) {
ee671b01
JL		 1454 case Opt_xprt_udp6:
1455 mountfamily = AF_INET6;
fdb66ff4 1456 case Opt_xprt_udp:
0896a725 1457 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1458 break;
ee671b01
JL		 1459 case Opt_xprt_tcp6:
1460 mountfamily = AF_INET6;
fdb66ff4 1461 case Opt_xprt_tcp:
0896a725 1462 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1463 break;
2cf7ff7a 1464 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1465 default:
f45663ce
CL		 1466 dfprintk(MOUNT, "NFS: unrecognized "
1467 "transport protocol\n");
d23c45fd 1468 return 0;
bf0fd768
CL		 1469 }
1470 break;
1471 case Opt_addr:
1472 string = match_strdup(args);
1473 if (string == NULL)
1474 goto out_nomem;
53a0b9c4 1475 mnt->nfs_server.addrlen =
b48e1278 1476 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1477 (struct sockaddr *)
1478 &mnt->nfs_server.address,
1479 sizeof(mnt->nfs_server.address));
bf0fd768 1480 kfree(string);
53a0b9c4
CL		 1481 if (mnt->nfs_server.addrlen == 0)
1482 goto out_invalid_address;
bf0fd768
CL		 1483 break;
1484 case Opt_clientaddr:
c5cb09b6 1485 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1486 goto out_nomem;
bf0fd768 1487 break;
33832034 1488 case Opt_mounthost:
c5cb09b6
RL		 1489 if (nfs_get_option_str(args,
1490 &mnt->mount_server.hostname))
33832034 1491 goto out_nomem;
33832034 1492 break;
0ac83779 1493 case Opt_mountaddr:
bf0fd768
CL		 1494 string = match_strdup(args);
1495 if (string == NULL)
1496 goto out_nomem;
53a0b9c4 1497 mnt->mount_server.addrlen =
b48e1278 1498 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1499 (struct sockaddr *)
1500 &mnt->mount_server.address,
1501 sizeof(mnt->mount_server.address));
bf0fd768 1502 kfree(string);
53a0b9c4
CL		 1503 if (mnt->mount_server.addrlen == 0)
1504 goto out_invalid_address;
bf0fd768 1505 break;
7973c1f1
TM		 1506 case Opt_lookupcache:
1507 string = match_strdup(args);
1508 if (string == NULL)
1509 goto out_nomem;
1510 token = match_token(string,
1511 nfs_lookupcache_tokens, args);
1512 kfree(string);
1513 switch (token) {
1514 case Opt_lookupcache_all:
1515 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1516 break;
1517 case Opt_lookupcache_positive:
1518 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1519 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1520 break;
1521 case Opt_lookupcache_none:
1522 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1523 break;
1524 default:
7973c1f1
TM		 1525 dfprintk(MOUNT, "NFS: invalid "
1526 "lookupcache argument\n");
d23c45fd 1527 return 0;
7973c1f1
TM		 1528 };
1529 break;
a6d5ff64 1530 case Opt_fscache_uniq:
c5cb09b6 1531 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1532 goto out_nomem;
a6d5ff64
CL		 1533 mnt->options |= NFS_OPTION_FSCACHE;
1534 break;
5eebde23
SJ		 1535 case Opt_local_lock:
1536 string = match_strdup(args);
1537 if (string == NULL)
1538 goto out_nomem;
1539 token = match_token(string, nfs_local_lock_tokens,
1540 args);
1541 kfree(string);
1542 switch (token) {
1543 case Opt_local_lock_all:
1544 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1545 NFS_MOUNT_LOCAL_FCNTL);
1546 break;
1547 case Opt_local_lock_flock:
1548 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1549 break;
1550 case Opt_local_lock_posix:
1551 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1552 break;
1553 case Opt_local_lock_none:
1554 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1555 NFS_MOUNT_LOCAL_FCNTL);
1556 break;
1557 default:
1558 dfprintk(MOUNT, "NFS: invalid "
1559 "local_lock argument\n");
1560 return 0;
1561 };
1562 break;
bf0fd768 1563
f45663ce
CL		 1564 /*
1565 * Special options
1566 */
1567 case Opt_sloppy:
1568 sloppy = 1;
1569 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1570 break;
bf0fd768
CL		 1571 case Opt_userspace:
1572 case Opt_deprecated:
d33e4dfe
CL		 1573 dfprintk(MOUNT, "NFS: ignoring mount option "
1574 "'%s'\n", p);
bf0fd768
CL		 1575 break;
1576
1577 default:
d23c45fd 1578 invalid_option = 1;
f45663ce
CL		 1579 dfprintk(MOUNT, "NFS: unrecognized mount option "
1580 "'%s'\n", p);
bf0fd768
CL		 1581 }
1582 }
1583
d23c45fd
CL		 1584 if (!sloppy && invalid_option)
1585 return 0;
1586
571b7554
WAA		 1587 if (mnt->minorversion && mnt->version != 4)
1588 goto out_minorversion_mismatch;
1589
ee671b01
JL		 1590 /*
1591 * verify that any proto=/mountproto= options match the address
1592 * familiies in the addr=/mountaddr= options.
1593 */
1594 if (protofamily != AF_UNSPEC &&
1595 protofamily != mnt->nfs_server.address.ss_family)
1596 goto out_proto_mismatch;
1597
1598 if (mountfamily != AF_UNSPEC) {
1599 if (mnt->mount_server.addrlen) {
1600 if (mountfamily != mnt->mount_server.address.ss_family)
1601 goto out_mountproto_mismatch;
1602 } else {
1603 if (mountfamily != mnt->nfs_server.address.ss_family)
1604 goto out_mountproto_mismatch;
1605 }
1606 }
1607
bf0fd768
CL		 1608 return 1;
1609
ee671b01
JL		 1610out_mountproto_mismatch:
1611 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1612 "option\n");
1613 return 0;
1614out_proto_mismatch:
1615 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1616 return 0;
53a0b9c4
CL		 1617out_invalid_address:
1618 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1619 return 0;
d23c45fd 1620out_invalid_value:
53a0b9c4 1621 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1622 return 0;
571b7554
WAA		 1623out_minorversion_mismatch:
1624 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1625 "minorversion=%u\n", mnt->version, mnt->minorversion);
1626 return 0;
bf0fd768
CL		 1627out_nomem:
1628 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1629 return 0;
f9c3a380
EP		 1630out_security_failure:
1631 free_secdata(secdata);
1632 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1633 return 0;
bf0fd768
CL		 1634}
1635
ec88f28d
CL		 1636/*
1637 * Match the requested auth flavors with the list returned by
1638 * the server. Returns zero and sets the mount's authentication
1639 * flavor on success; returns -EACCES if server does not support
1640 * the requested flavor.
1641 */
1642static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1643 struct nfs_mount_request *request)
1644{
1645 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1646
5eecfde6
CL		 1647 /*
1648 * Certain releases of Linux's mountd return an empty
1649 * flavor list. To prevent behavioral regression with
1650 * these servers (ie. rejecting mounts that used to
1651 * succeed), revert to pre-2.6.32 behavior (no checking)
1652 * if the returned flavor list is empty.
1653 */
1654 if (server_authlist_len == 0)
1655 return 0;
1656
ec88f28d
CL		 1657 /*
1658 * We avoid sophisticated negotiating here, as there are
1659 * plenty of cases where we can get it wrong, providing
1660 * either too little or too much security.
1661 *
1662 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1663 * flavor listed first. However, some servers list
1664 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1665 * preferred default, in args->auth_flavors[0] if user
1666 * didn't specify sec= mount option.
1667 */
1668 for (i = 0; i < args->auth_flavor_len; i++)
1669 for (j = 0; j < server_authlist_len; j++)
1670 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1671 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1672 request->auth_flavs[j]);
1673 args->auth_flavors[0] = request->auth_flavs[j];
1674 return 0;
1675 }
1676
1677 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1678 nfs_umount(request);
1679 return -EACCES;
1680}
1681
0076d7b7
CL		 1682/*
1683 * Use the remote server's MOUNT service to request the NFS file handle
1684 * corresponding to the provided path.
1685 */
486aa699
BS		 1686static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1687 struct nfs_fh *root_fh)
0076d7b7 1688{
ec88f28d
CL		 1689 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1690 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1691 struct nfs_mount_request request = {
1692 .sap = (struct sockaddr *)
1693 &args->mount_server.address,
1694 .dirpath = args->nfs_server.export_path,
1695 .protocol = args->mount_server.protocol,
1696 .fh = root_fh,
50a737f8 1697 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1698 .auth_flav_len = &server_authlist_len,
1699 .auth_flavs = server_authlist,
6d59b8d5 1700 .net = args->net,
c5d120f8 1701 };
4c568017 1702 int status;
0076d7b7
CL		 1703
1704 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1705 switch (args->version) {
1706 default:
1707 args->mount_server.version = NFS_MNT3_VERSION;
1708 break;
1709 case 2:
1710 args->mount_server.version = NFS_MNT_VERSION;
1711 }
0076d7b7 1712 }
c5d120f8 1713 request.version = args->mount_server.version;
0076d7b7 1714
33832034 1715 if (args->mount_server.hostname)
c5d120f8 1716 request.hostname = args->mount_server.hostname;
33832034 1717 else
c5d120f8 1718 request.hostname = args->nfs_server.hostname;
33832034 1719
0076d7b7
CL		 1720 /*
1721 * Construct the mount server's address.
1722 */
4c568017 1723 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1724 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1725 args->nfs_server.addrlen);
1726 args->mount_server.addrlen = args->nfs_server.addrlen;
1727 }
c5d120f8 1728 request.salen = args->mount_server.addrlen;
f5855fec 1729 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1730
1731 /*
1732 * Now ask the mount server to map our export path
1733 * to a file handle.
1734 */
c5d120f8 1735 status = nfs_mount(&request);
ec88f28d
CL		 1736 if (status != 0) {
1737 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1738 request.hostname, status);
1739 return status;
1740 }
0076d7b7 1741
ec88f28d
CL		 1742 /*
1743 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1744 */
1745 if (args->mount_server.version != NFS_MNT3_VERSION)
1746 return 0;
1747 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1748}
1749
486aa699
BS		 1750static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1751 struct nfs_fh *mntfh,
1752 struct nfs_mount_info *mount_info)
1753{
1754 int status;
1755 struct nfs_server *server;
1756
1757 status = nfs_request_mount(mount_info->parsed, mntfh);
1758 if (status)
1759 return ERR_PTR(status);
1760
1761 /* Get a volume representation */
1762 server = nfs_create_server(mount_info->parsed, mntfh);
1763 if (IS_ERR(server))
1764 return ERR_CAST(server);
1765
1766 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mntfh, mount_info);
1767}
1768
c12bacec
RL		 1769/*
1770 * Split "dev_name" into "hostname:export_path".
1771 *
1772 * The leftmost colon demarks the split between the server's hostname
1773 * and the export path. If the hostname starts with a left square
1774 * bracket, then it may contain colons.
1775 *
1776 * Note: caller frees hostname and export path, even on error.
1777 */
1778static int nfs_parse_devname(const char *dev_name,
1779 char **hostname, size_t maxnamlen,
1780 char **export_path, size_t maxpathlen)
dc045898
CL		 1781{
1782 size_t len;
c12bacec 1783 char *end;
dc045898 1784
c12bacec
RL		 1785 /* Is the host name protected with square brakcets? */
1786 if (*dev_name == '[') {
1787 end = strchr(++dev_name, ']');
1788 if (end == NULL || end[1] != ':')
dc045898 1789 goto out_bad_devname;
dc045898 1790
c12bacec
RL		 1791 len = end - dev_name;
1792 end++;
1793 } else {
1794 char *comma;
dc045898 1795
c12bacec
RL		 1796 end = strchr(dev_name, ':');
1797 if (end == NULL)
1798 goto out_bad_devname;
1799 len = end - dev_name;
d1aa0825 1800
c12bacec
RL		 1801 /* kill possible hostname list: not supported */
1802 comma = strchr(dev_name, ',');
1803 if (comma != NULL && comma < end)
1804 *comma = 0;
1805 }
d1aa0825 1806
d1aa0825
CL		 1807 if (len > maxnamlen)
1808 goto out_hostname;
1809
1810 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1811 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1812 if (*hostname == NULL)
1813 goto out_nomem;
c12bacec 1814 len = strlen(++end);
d1aa0825
CL		 1815 if (len > maxpathlen)
1816 goto out_path;
1817 *export_path = kstrndup(end, len, GFP_KERNEL);
1818 if (!*export_path)
1819 goto out_nomem;
1820
c12bacec 1821 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1822 return 0;
1823
1824out_bad_devname:
1825 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1826 return -EINVAL;
1827
1828out_nomem:
1829 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1830 return -ENOMEM;
1831
1832out_hostname:
1833 dfprintk(MOUNT, "NFS: server hostname too long\n");
1834 return -ENAMETOOLONG;
1835
1836out_path:
1837 dfprintk(MOUNT, "NFS: export pathname too long\n");
1838 return -ENAMETOOLONG;
1839}
1840
f7b422b1 1841/*
54ceac45
DH		 1842 * Validate the NFS2/NFS3 mount data
1843 * - fills in the mount root filehandle
136d558c
CL		 1844 *
1845 * For option strings, user space handles the following behaviors:
1846 *
1847 * + DNS: mapping server host name to IP address ("addr=" option)
1848 *
1849 * + failure mode: how to behave if a mount request can't be handled
1850 * immediately ("fg/bg" option)
1851 *
1852 * + retry: how often to retry a mount request ("retry=" option)
1853 *
1854 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1855 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1856 */
2283f8d6
TT		 1857static int nfs_validate_mount_data(void *options,
1858 struct nfs_parsed_mount_data *args,
136d558c
CL		 1859 struct nfs_fh *mntfh,
1860 const char *dev_name)
f7b422b1 1861{
2283f8d6 1862 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1863 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1864
5df36e78
CL		 1865 if (data == NULL)
1866 goto out_no_data;
f7b422b1 1867
54ceac45 1868 switch (data->version) {
5df36e78
CL		 1869 case 1:
1870 data->namlen = 0;
1871 case 2:
1872 data->bsize = 0;
1873 case 3:
1874 if (data->flags & NFS_MOUNT_VER3)
1875 goto out_no_v3;
1876 data->root.size = NFS2_FHSIZE;
1877 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1878 case 4:
1879 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1880 goto out_no_sec;
1881 case 5:
1882 memset(data->context, 0, sizeof(data->context));
1883 case 6:
b7e24457
TM		 1884 if (data->flags & NFS_MOUNT_VER3) {
1885 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1886 goto out_invalid_fh;
5df36e78 1887 mntfh->size = data->root.size;
764302cc
CL		 1888 args->version = 3;
1889 } else {
5df36e78 1890 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1891 args->version = 2;
1892 }
5df36e78 1893
5df36e78
CL		 1894
1895 memcpy(mntfh->data, data->root.data, mntfh->size);
1896 if (mntfh->size < sizeof(mntfh->data))
1897 memset(mntfh->data + mntfh->size, 0,
1898 sizeof(mntfh->data) - mntfh->size);
6e88e061 1899
2283f8d6
TT		 1900 /*
1901 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1902 * can deal with.
1903 */
ff3525a5 1904 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1905 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1906 args->rsize = data->rsize;
1907 args->wsize = data->wsize;
2283f8d6
TT		 1908 args->timeo = data->timeo;
1909 args->retrans = data->retrans;
1910 args->acregmin = data->acregmin;
1911 args->acregmax = data->acregmax;
1912 args->acdirmin = data->acdirmin;
1913 args->acdirmax = data->acdirmax;
4c568017 1914
4cfd74fc 1915 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1916 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1917 if (!nfs_verify_server_address(sap))
4c568017
CL		 1918 goto out_no_address;
1919
2283f8d6 1920 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1921 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1922 /* N.B. caller will free nfs_server.hostname in all cases */
1923 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1924 args->namlen = data->namlen;
1925 args->bsize = data->bsize;
dd07c947
CL		 1926
1927 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1928 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1929 if (!args->nfs_server.hostname)
1930 goto out_nomem;
f9c3a380 1931
5eebde23
SJ		 1932 if (!(data->flags & NFS_MOUNT_NONLM))
1933 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1934 NFS_MOUNT_LOCAL_FCNTL);
1935 else
1936 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1937 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1938 /*
1939 * The legacy version 6 binary mount data from userspace has a
1940 * field used only to transport selinux information into the
1941 * the kernel. To continue to support that functionality we
1942 * have a touch of selinux knowledge here in the NFS code. The
1943 * userspace code converted context=blah to just blah so we are
1944 * converting back to the full string selinux understands.
1945 */
1946 if (data->context[0]){
1947#ifdef CONFIG_SECURITY_SELINUX
1948 int rc;
1949 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1950 if (!opts_str)
1951 return -ENOMEM;
1952 strcpy(opts_str, "context=");
1953 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1954 strcat(opts_str, &data->context[0]);
1955 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1956 kfree(opts_str);
1957 if (rc)
1958 return rc;
1959#else
1960 return -EINVAL;
1961#endif
1962 }
1963
5df36e78 1964 break;
136d558c 1965 default: {
136d558c 1966 int status;
136d558c 1967
2283f8d6
TT		 1968 if (nfs_parse_mount_options((char *)options, args) == 0)
1969 return -EINVAL;
136d558c 1970
4cfd74fc 1971 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1972 goto out_no_address;
1973
764302cc
CL		 1974 if (args->version == 4)
1975#ifdef CONFIG_NFS_V4
1976 return nfs4_validate_text_mount_data(options,
1977 args, dev_name);
1978#else
1979 goto out_v4_not_compiled;
1980#endif
1981
f5855fec 1982 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1983
259875ef
TM		 1984 nfs_set_mount_transport_protocol(args);
1985
dc045898
CL		 1986 status = nfs_parse_devname(dev_name,
1987 &args->nfs_server.hostname,
1988 PAGE_SIZE,
1989 &args->nfs_server.export_path,
1990 NFS_MAXPATHLEN);
136d558c 1991
136d558c 1992 if (status)
fdc6e2c8 1993 return status;
136d558c 1994
136d558c
CL		 1995 break;
1996 }
f7b422b1 1997 }
54ceac45
DH		 1998
1999#ifndef CONFIG_NFS_V3
8a6e5deb 2000 if (args->version == 3)
5df36e78
CL		 2001 goto out_v3_not_compiled;
2002#endif /* !CONFIG_NFS_V3 */
f7b422b1 2003
5df36e78 2004 return 0;
f7b422b1 2005
5df36e78
CL		 2006out_no_data:
2007 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
2008 return -EINVAL;
54ceac45 2009
5df36e78
CL		 2010out_no_v3:
2011 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
2012 data->version);
2013 return -EINVAL;
f7b422b1 2014
5df36e78
CL		 2015out_no_sec:
2016 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
2017 return -EINVAL;
2018
5df36e78
CL		 2019#ifndef CONFIG_NFS_V3
2020out_v3_not_compiled:
2021 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2022 return -EPROTONOSUPPORT;
2023#endif /* !CONFIG_NFS_V3 */
2024
764302cc
CL		 2025#ifndef CONFIG_NFS_V4
2026out_v4_not_compiled:
2027 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2028 return -EPROTONOSUPPORT;
2029#endif /* !CONFIG_NFS_V4 */
2030
63649bd7
CG		 2031out_nomem:
2032 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2033 return -ENOMEM;
2034
5df36e78
CL		 2035out_no_address:
2036 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2037 return -EINVAL;
2038
2039out_invalid_fh:
2040 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2041 return -EINVAL;
f7b422b1
DH		 2042}
2043
48b605f8
JL		 2044static int
2045nfs_compare_remount_data(struct nfs_server *nfss,
2046 struct nfs_parsed_mount_data *data)
2047{
2048 if (data->flags != nfss->flags ||
2049 data->rsize != nfss->rsize ||
2050 data->wsize != nfss->wsize ||
2051 data->retrans != nfss->client->cl_timeout->to_retries ||
2052 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2053 data->acregmin != nfss->acregmin / HZ ||
2054 data->acregmax != nfss->acregmax / HZ ||
2055 data->acdirmin != nfss->acdirmin / HZ ||
2056 data->acdirmax != nfss->acdirmax / HZ ||
2057 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2058 data->nfs_server.port != nfss->port ||
48b605f8 2059 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2060 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2061 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2062 return -EINVAL;
2063
2064 return 0;
2065}
2066
2067static int
2068nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2069{
2070 int error;
2071 struct nfs_server *nfss = sb->s_fs_info;
2072 struct nfs_parsed_mount_data *data;
2073 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2074 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2075 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2076
2077 /*
2078 * Userspace mount programs that send binary options generally send
2079 * them populated with default values. We have no way to know which
2080 * ones were explicitly specified. Fall back to legacy behavior and
2081 * just return success.
2082 */
31c94469
MZ		 2083 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2084 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2085 options->version <= 6))))
48b605f8
JL		 2086 return 0;
2087
2088 data = kzalloc(sizeof(*data), GFP_KERNEL);
2089 if (data == NULL)
2090 return -ENOMEM;
2091
2092 /* fill out struct with values from existing mount */
2093 data->flags = nfss->flags;
2094 data->rsize = nfss->rsize;
2095 data->wsize = nfss->wsize;
2096 data->retrans = nfss->client->cl_timeout->to_retries;
2097 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2098 data->acregmin = nfss->acregmin / HZ;
2099 data->acregmax = nfss->acregmax / HZ;
2100 data->acdirmin = nfss->acdirmin / HZ;
2101 data->acdirmax = nfss->acdirmax / HZ;
2102 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2103 data->nfs_server.port = nfss->port;
48b605f8
JL		 2104 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2105 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2106 data->nfs_server.addrlen);
2107
2108 /* overwrite those values with any that were specified */
2109 error = nfs_parse_mount_options((char *)options, data);
2110 if (error < 0)
2111 goto out;
2112
26c4c170
JL		 2113 /*
2114 * noac is a special case. It implies -o sync, but that's not
2115 * necessarily reflected in the mtab options. do_remount_sb
2116 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2117 * remount options, so we have to explicitly reset it.
2118 */
2119 if (data->flags & NFS_MOUNT_NOAC)
2120 *flags |= MS_SYNCHRONOUS;
2121
48b605f8
JL		 2122 /* compare new mount options with old ones */
2123 error = nfs_compare_remount_data(nfss, data);
2124out:
2125 kfree(data);
2126 return error;
2127}
2128
f7b422b1 2129/*
54ceac45 2130 * Initialise the common bits of the superblock
f7b422b1 2131 */
54ceac45 2132static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2133{
54ceac45 2134 struct nfs_server *server = NFS_SB(sb);
5006a76c 2135
54ceac45 2136 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2137
54ceac45
DH		 2138 /* We probably want something more informative here */
2139 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2140 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2141
54ceac45
DH		 2142 if (sb->s_blocksize == 0)
2143 sb->s_blocksize = nfs_block_bits(server->wsize,
2144 &sb->s_blocksize_bits);
f7b422b1 2145
32a88aa1
JA		 2146 sb->s_bdi = &server->backing_dev_info;
2147
54ceac45 2148 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2149}
2150
2151/*
54ceac45 2152 * Finish setting up an NFS2/3 superblock
f7b422b1 2153 */
2283f8d6 2154static void nfs_fill_super(struct super_block *sb,
c40f8d1d 2155 struct nfs_mount_info *mount_info)
f7b422b1 2156{
c40f8d1d 2157 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2158 struct nfs_server *server = NFS_SB(sb);
5006a76c 2159
54ceac45
DH		 2160 sb->s_blocksize_bits = 0;
2161 sb->s_blocksize = 0;
2162 if (data->bsize)
2163 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2164
8a6e5deb 2165 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2166 /* The VFS shouldn't apply the umask to mode bits. We will do
2167 * so ourselves when necessary.
2168 */
2169 sb->s_flags |= MS_POSIXACL;
2170 sb->s_time_gran = 1;
816724e6 2171 }
54ceac45
DH		 2172
2173 sb->s_op = &nfs_sops;
2174 nfs_initialise_sb(sb);
f7b422b1
DH		 2175}
2176
2177/*
54ceac45 2178 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2179 */
54ceac45 2180static void nfs_clone_super(struct super_block *sb,
8c958e0c 2181 struct nfs_mount_info *mount_info)
f7b422b1 2182{
8c958e0c 2183 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2184 struct nfs_server *server = NFS_SB(sb);
2185
2186 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2187 sb->s_blocksize = old_sb->s_blocksize;
2188 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2189
8a6e5deb 2190 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2191 /* The VFS shouldn't apply the umask to mode bits. We will do
2192 * so ourselves when necessary.
f7b422b1
DH		 2193 */
2194 sb->s_flags |= MS_POSIXACL;
f7b422b1 2195 sb->s_time_gran = 1;
f7b422b1
DH		 2196 }
2197
54ceac45
DH		 2198 sb->s_op = old_sb->s_op;
2199 nfs_initialise_sb(sb);
f7b422b1
DH		 2200}
2201
275a5d24
TM		 2202static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2203{
2204 const struct nfs_server *a = s->s_fs_info;
2205 const struct rpc_clnt *clnt_a = a->client;
2206 const struct rpc_clnt *clnt_b = b->client;
2207
2208 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2209 goto Ebusy;
2210 if (a->nfs_client != b->nfs_client)
2211 goto Ebusy;
2212 if (a->flags != b->flags)
2213 goto Ebusy;
2214 if (a->wsize != b->wsize)
2215 goto Ebusy;
2216 if (a->rsize != b->rsize)
2217 goto Ebusy;
2218 if (a->acregmin != b->acregmin)
2219 goto Ebusy;
2220 if (a->acregmax != b->acregmax)
2221 goto Ebusy;
2222 if (a->acdirmin != b->acdirmin)
2223 goto Ebusy;
2224 if (a->acdirmax != b->acdirmax)
2225 goto Ebusy;
2226 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2227 goto Ebusy;
e89a5a43 2228 return 1;
275a5d24 2229Ebusy:
e89a5a43
TM		 2230 return 0;
2231}
2232
2233struct nfs_sb_mountdata {
2234 struct nfs_server *server;
2235 int mntflags;
2236};
2237
2238static int nfs_set_super(struct super_block *s, void *data)
2239{
2240 struct nfs_sb_mountdata *sb_mntdata = data;
2241 struct nfs_server *server = sb_mntdata->server;
2242 int ret;
2243
2244 s->s_flags = sb_mntdata->mntflags;
2245 s->s_fs_info = server;
8b244ff2 2246 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2247 ret = set_anon_super(s, server);
2248 if (ret == 0)
2249 server->s_dev = s->s_dev;
2250 return ret;
2251}
2252
fd00a8ff
CL		 2253static int nfs_compare_super_address(struct nfs_server *server1,
2254 struct nfs_server *server2)
2255{
2256 struct sockaddr *sap1, *sap2;
2257
2258 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2259 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2260
2261 if (sap1->sa_family != sap2->sa_family)
2262 return 0;
2263
2264 switch (sap1->sa_family) {
2265 case AF_INET: {
2266 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2267 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2268 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2269 return 0;
2270 if (sin1->sin_port != sin2->sin_port)
2271 return 0;
2272 break;
2273 }
2274 case AF_INET6: {
2275 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2276 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2277 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2278 return 0;
2279 if (sin1->sin6_port != sin2->sin6_port)
2280 return 0;
2281 break;
2282 }
2283 default:
2284 return 0;
2285 }
2286
2287 return 1;
2288}
2289
e89a5a43
TM		 2290static int nfs_compare_super(struct super_block *sb, void *data)
2291{
2292 struct nfs_sb_mountdata *sb_mntdata = data;
2293 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2294 int mntflags = sb_mntdata->mntflags;
2295
fd00a8ff 2296 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2297 return 0;
2298 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2299 if (old->flags & NFS_MOUNT_UNSHARED)
2300 return 0;
2301 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2302 return 0;
2303 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2304}
2305
2311b943
BS		 2306static void nfs_get_cache_cookie(struct super_block *sb,
2307 struct nfs_parsed_mount_data *parsed,
2308 struct nfs_clone_mount *cloned)
2309{
2310 char *uniq = NULL;
2311 int ulen = 0;
2312
2313 if (parsed && parsed->fscache_uniq) {
2314 uniq = parsed->fscache_uniq;
2315 ulen = strlen(parsed->fscache_uniq);
2316 } else if (cloned) {
2317 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2318 if (mnt_s->fscache_key) {
2319 uniq = mnt_s->fscache_key->key.uniquifier;
2320 ulen = mnt_s->fscache_key->key.uniq_len;
2321 };
2322 }
2323
2324 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2325}
2326
fa799759
MS		 2327static int nfs_bdi_register(struct nfs_server *server)
2328{
2329 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2330}
2331
3d176e3f
BS		 2332static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2333 struct nfs_mount_info *mount_info)
2334{
2335 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2336}
2337
2338static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2339 struct nfs_mount_info *mount_info)
2340{
2341 /* clone any lsm security options from the parent to the new sb */
2342 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2343 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2344 return -ESTALE;
2345 return 0;
2346}
2347
c40f8d1d
BS		 2348static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2349 struct nfs_server *server,
2350 int flags, const char *dev_name,
2351 struct nfs_fh *mntfh,
2352 struct nfs_mount_info *mount_info)
f7b422b1 2353{
f7b422b1 2354 struct super_block *s;
01194981 2355 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2356 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2357 struct nfs_sb_mountdata sb_mntdata = {
2358 .mntflags = flags,
c40f8d1d 2359 .server = server,
e89a5a43 2360 };
01194981 2361 int error;
33852a1f 2362
75180df2
TM		 2363 if (server->flags & NFS_MOUNT_UNSHARED)
2364 compare_super = NULL;
2365
fb2088cc
SP		 2366 /* -o noac implies -o sync */
2367 if (server->flags & NFS_MOUNT_NOAC)
2368 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2369
54ceac45 2370 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2371 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2372 if (IS_ERR(s)) {
01194981 2373 mntroot = ERR_CAST(s);
54ceac45 2374 goto out_err_nosb;
816724e6
TM		 2375 }
2376
54ceac45
DH		 2377 if (s->s_fs_info != server) {
2378 nfs_free_server(server);
2379 server = NULL;
fa799759
MS		 2380 } else {
2381 error = nfs_bdi_register(server);
01194981
AV		 2382 if (error) {
2383 mntroot = ERR_PTR(error);
cfbc0683 2384 goto error_splat_bdi;
01194981 2385 }
54ceac45 2386 }
f7b422b1 2387
54ceac45
DH		 2388 if (!s->s_root) {
2389 /* initial superblock/root creation */
c40f8d1d 2390 mount_info->fill_super(s, mount_info);
3d176e3f 2391 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2392 }
f7b422b1 2393
0d5839ad 2394 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2395 if (IS_ERR(mntroot))
54ceac45 2396 goto error_splat_super;
816724e6 2397
3d176e3f 2398 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2399 if (error)
2400 goto error_splat_root;
2401
54ceac45 2402 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2403
2404out:
01194981 2405 return mntroot;
816724e6 2406
54ceac45
DH		 2407out_err_nosb:
2408 nfs_free_server(server);
0655960f 2409 goto out;
54ceac45 2410
f9c3a380
EP		 2411error_splat_root:
2412 dput(mntroot);
01194981 2413 mntroot = ERR_PTR(error);
54ceac45 2414error_splat_super:
cfbc0683
N		 2415 if (server && !s->s_root)
2416 bdi_unregister(&server->backing_dev_info);
2417error_splat_bdi:
6f5bbff9 2418 deactivate_locked_super(s);
0655960f 2419 goto out;
f7b422b1
DH		 2420}
2421
c40f8d1d
BS		 2422static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2423 int flags, const char *dev_name, void *raw_data)
2424{
c40f8d1d
BS		 2425 struct nfs_parsed_mount_data *data = NULL;
2426 struct nfs_mount_info mount_info = {
2427 .fill_super = nfs_fill_super,
3d176e3f 2428 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2429 };
2430 struct nfs_fh *mntfh;
2431 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2432 int error;
2433
db833351 2434 data = nfs_alloc_parsed_mount_data();
c40f8d1d
BS		 2435 mntfh = nfs_alloc_fhandle();
2436 if (data == NULL || mntfh == NULL)
2437 goto out;
2438
2439 /* Validate the mount data */
2440 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
2441 if (error < 0) {
2442 mntroot = ERR_PTR(error);
2443 goto out;
2444 }
2445 mount_info.parsed = data;
2446
2447#ifdef CONFIG_NFS_V4
486aa699 2448 if (data->version == 4)
c40f8d1d 2449 mntroot = nfs4_try_mount(flags, dev_name, data);
486aa699 2450 else
c40f8d1d 2451#endif /* CONFIG_NFS_V4 */
486aa699 2452 mntroot = nfs_try_mount(flags, dev_name, mntfh, &mount_info);
c40f8d1d 2453
c40f8d1d
BS		 2454out:
2455 nfs_free_parsed_mount_data(data);
2456 nfs_free_fhandle(mntfh);
2457 return mntroot;
2458}
2459
387c149b
TM		 2460/*
2461 * Ensure that we unregister the bdi before kill_anon_super
2462 * releases the device name
2463 */
2464static void nfs_put_super(struct super_block *s)
2465{
2466 struct nfs_server *server = NFS_SB(s);
2467
2468 bdi_unregister(&server->backing_dev_info);
2469}
2470
54ceac45
DH		 2471/*
2472 * Destroy an NFS2/3 superblock
2473 */
f7b422b1
DH		 2474static void nfs_kill_super(struct super_block *s)
2475{
2476 struct nfs_server *server = NFS_SB(s);
2477
2478 kill_anon_super(s);
08734048 2479 nfs_fscache_release_super_cookie(s);
54ceac45 2480 nfs_free_server(server);
f7b422b1
DH		 2481}
2482
54ceac45 2483/*
8c958e0c 2484 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2485 */
31f43471 2486static struct dentry *
8c958e0c
BS		 2487nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2488 const char *dev_name, struct nfs_mount_info *mount_info)
f7b422b1 2489{
8c958e0c 2490 struct nfs_clone_mount *data = mount_info->cloned;
54ceac45 2491 struct nfs_server *server;
3d176e3f 2492 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45 2493 int error;
f7b422b1 2494
8c958e0c 2495 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2496
54ceac45 2497 /* create a new volume representation */
7e6eb683 2498 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2499 if (IS_ERR(server)) {
2500 error = PTR_ERR(server);
3d176e3f 2501 goto out_err;
4c1fe2f7 2502 }
f7b422b1 2503
3d176e3f 2504 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, data->fh, mount_info);
8c958e0c 2505 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2506out:
31f43471 2507 return mntroot;
24c8dbbb 2508
3d176e3f 2509out_err:
8c958e0c 2510 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2511 goto out;
f7b422b1
DH		 2512}
2513
8c958e0c
BS		 2514/*
2515 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2516 */
2517static struct dentry *
2518nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2519 const char *dev_name, void *raw_data)
2520{
2521 struct nfs_mount_info mount_info = {
2522 .fill_super = nfs_clone_super,
3d176e3f 2523 .set_security = nfs_clone_sb_security,
8c958e0c
BS		 2524 .cloned = raw_data,
2525 };
2526 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2527}
2528
54ceac45
DH		 2529#ifdef CONFIG_NFS_V4
2530
f7b422b1 2531/*
54ceac45 2532 * Finish setting up a cloned NFS4 superblock
f7b422b1 2533 */
54ceac45 2534static void nfs4_clone_super(struct super_block *sb,
8c958e0c 2535 struct nfs_mount_info *mount_info)
f7b422b1 2536{
8c958e0c 2537 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2538 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2539 sb->s_blocksize = old_sb->s_blocksize;
2540 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2541 sb->s_time_gran = 1;
54ceac45 2542 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2543 /*
2544 * The VFS shouldn't apply the umask to mode bits. We will do
2545 * so ourselves when necessary.
2546 */
2547 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2548 sb->s_xattr = old_sb->s_xattr;
2549 nfs_initialise_sb(sb);
f7b422b1
DH		 2550}
2551
54ceac45
DH		 2552/*
2553 * Set up an NFS4 superblock
2554 */
c40f8d1d
BS		 2555static void nfs4_fill_super(struct super_block *sb,
2556 struct nfs_mount_info *mount_info)
f7b422b1 2557{
54ceac45
DH		 2558 sb->s_time_gran = 1;
2559 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2560 /*
2561 * The VFS shouldn't apply the umask to mode bits. We will do
2562 * so ourselves when necessary.
2563 */
2564 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2565 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2566 nfs_initialise_sb(sb);
f7b422b1
DH		 2567}
2568
01c3f052
TM		 2569static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2570{
5eebde23
SJ		 2571 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2572 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2573}
2574
7630c852
CL		 2575static int nfs4_validate_text_mount_data(void *options,
2576 struct nfs_parsed_mount_data *args,
2577 const char *dev_name)
2578{
2579 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2580
f5855fec 2581 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2582
2583 nfs_validate_transport_protocol(args);
2584
2585 nfs4_validate_mount_flags(args);
2586
2ecda72b
TM		 2587 if (args->version != 4) {
2588 dfprintk(MOUNT,
2589 "NFS4: Illegal mount version\n");
2590 return -EINVAL;
2591 }
2592
7630c852
CL		 2593 if (args->auth_flavor_len > 1) {
2594 dfprintk(MOUNT,
2595 "NFS4: Too many RPC auth flavours specified\n");
2596 return -EINVAL;
2597 }
2598
7630c852
CL		 2599 return nfs_parse_devname(dev_name,
2600 &args->nfs_server.hostname,
2601 NFS4_MAXNAMLEN,
2602 &args->nfs_server.export_path,
2603 NFS4_MAXPATHLEN);
2604}
2605
f0768ebd
CL		 2606/*
2607 * Validate NFSv4 mount options
2608 */
91ea40b9
TT		 2609static int nfs4_validate_mount_data(void *options,
2610 struct nfs_parsed_mount_data *args,
2611 const char *dev_name)
f0768ebd 2612{
4cfd74fc 2613 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2614 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2615 char *c;
2616
2617 if (data == NULL)
2618 goto out_no_data;
2619
2620 switch (data->version) {
2621 case 1:
4c568017
CL		 2622 if (data->host_addrlen > sizeof(args->nfs_server.address))
2623 goto out_no_address;
2624 if (data->host_addrlen == 0)
f0768ebd 2625 goto out_no_address;
4c568017 2626 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2627 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2628 return -EFAULT;
4cfd74fc 2629 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2630 goto out_no_address;
2631
6738b251
CL		 2632 if (data->auth_flavourlen) {
2633 if (data->auth_flavourlen > 1)
2634 goto out_inval_auth;
20c71f5e 2635 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2636 data->auth_flavours,
20c71f5e 2637 sizeof(args->auth_flavors[0])))
f0768ebd 2638 return -EFAULT;
f0768ebd
CL		 2639 }
2640
2641 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2642 if (IS_ERR(c))
2643 return PTR_ERR(c);
91ea40b9 2644 args->nfs_server.hostname = c;
f0768ebd
CL		 2645
2646 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2647 if (IS_ERR(c))
2648 return PTR_ERR(c);
91ea40b9
TT		 2649 args->nfs_server.export_path = c;
2650 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2651
2652 c = strndup_user(data->client_addr.data, 16);
2653 if (IS_ERR(c))
2654 return PTR_ERR(c);
91ea40b9
TT		 2655 args->client_address = c;
2656
2657 /*
2658 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2659 * can deal with.
2660 */
2661
2662 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2663 args->rsize = data->rsize;
2664 args->wsize = data->wsize;
2665 args->timeo = data->timeo;
2666 args->retrans = data->retrans;
2667 args->acregmin = data->acregmin;
2668 args->acregmax = data->acregmax;
2669 args->acdirmin = data->acdirmin;
2670 args->acdirmax = data->acdirmax;
2671 args->nfs_server.protocol = data->proto;
259875ef 2672 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2673
2674 break;
7630c852 2675 default:
91ea40b9 2676 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2677 return -EINVAL;
2678
4cfd74fc 2679 if (!nfs_verify_server_address(sap))
80071225 2680 return -EINVAL;
dc045898 2681
7630c852 2682 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2683 }
2684
2685 return 0;
2686
2687out_no_data:
2688 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2689 return -EINVAL;
2690
2691out_inval_auth:
2692 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2693 data->auth_flavourlen);
2694 return -EINVAL;
2695
2696out_no_address:
2697 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2698 return -EINVAL;
f0768ebd
CL		 2699}
2700
54ceac45 2701/*
c02d7adf 2702 * Get the superblock for the NFS4 root partition
54ceac45 2703 */
31f43471
AV		 2704static struct dentry *
2705nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2706 const char *dev_name, void *raw_data)
f7b422b1 2707{
c40f8d1d
BS		 2708 struct nfs_mount_info mount_info = {
2709 .fill_super = nfs4_fill_super,
3d176e3f 2710 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2711 .parsed = raw_data,
2712 };
54ceac45 2713 struct nfs_server *server;
33852a1f 2714 struct nfs_fh *mntfh;
c40f8d1d 2715 struct dentry *mntroot = ERR_PTR(-ENOMEM);
33852a1f 2716
b157b06c 2717 mntfh = nfs_alloc_fhandle();
c40f8d1d 2718 if (mount_info.parsed == NULL || mntfh == NULL)
8a0d551a 2719 goto out;
f9c3a380 2720
54ceac45 2721 /* Get a volume representation */
c40f8d1d 2722 server = nfs4_create_server(mount_info.parsed, mntfh);
54ceac45 2723 if (IS_ERR(server)) {
c40f8d1d 2724 mntroot = ERR_CAST(server);
29eb981a 2725 goto out;
f7b422b1
DH		 2726 }
2727
c40f8d1d
BS		 2728 mntroot = nfs_fs_mount_common(fs_type, server, flags,
2729 dev_name, mntfh, &mount_info);
29eb981a
CL		 2730
2731out:
b157b06c 2732 nfs_free_fhandle(mntfh);
c40f8d1d 2733 return mntroot;
f7b422b1
DH		 2734}
2735
c02d7adf
TM		 2736static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2737 int flags, void *data, const char *hostname)
2738{
2739 struct vfsmount *root_mnt;
2740 char *root_devname;
2741 size_t len;
2742
98a2139f 2743 len = strlen(hostname) + 5;
c02d7adf
TM		 2744 root_devname = kmalloc(len, GFP_KERNEL);
2745 if (root_devname == NULL)
2746 return ERR_PTR(-ENOMEM);
98a2139f
JK		 2747 /* Does hostname needs to be enclosed in brackets? */
2748 if (strchr(hostname, ':'))
2749 snprintf(root_devname, len, "[%s]:/", hostname);
2750 else
2751 snprintf(root_devname, len, "%s:/", hostname);
c02d7adf
TM		 2752 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2753 kfree(root_devname);
2754 return root_mnt;
2755}
2756
ce587e07
TM		 2757struct nfs_referral_count {
2758 struct list_head list;
2759 const struct task_struct *task;
2760 unsigned int referral_count;
2761};
2762
2763static LIST_HEAD(nfs_referral_count_list);
2764static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2765
2766static struct nfs_referral_count *nfs_find_referral_count(void)
2767{
2768 struct nfs_referral_count *p;
2769
2770 list_for_each_entry(p, &nfs_referral_count_list, list) {
2771 if (p->task == current)
2772 return p;
2773 }
2774 return NULL;
2775}
2776
2777#define NFS_MAX_NESTED_REFERRALS 2
2778
2779static int nfs_referral_loop_protect(void)
2780{
2781 struct nfs_referral_count *p, *new;
2782 int ret = -ENOMEM;
2783
2784 new = kmalloc(sizeof(*new), GFP_KERNEL);
2785 if (!new)
2786 goto out;
2787 new->task = current;
2788 new->referral_count = 1;
2789
2790 ret = 0;
2791 spin_lock(&nfs_referral_count_list_lock);
2792 p = nfs_find_referral_count();
2793 if (p != NULL) {
2794 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2795 ret = -ELOOP;
2796 else
2797 p->referral_count++;
2798 } else {
2799 list_add(&new->list, &nfs_referral_count_list);
2800 new = NULL;
2801 }
2802 spin_unlock(&nfs_referral_count_list_lock);
2803 kfree(new);
2804out:
2805 return ret;
2806}
2807
2808static void nfs_referral_loop_unprotect(void)
2809{
2810 struct nfs_referral_count *p;
2811
2812 spin_lock(&nfs_referral_count_list_lock);
2813 p = nfs_find_referral_count();
2814 p->referral_count--;
2815 if (p->referral_count == 0)
2816 list_del(&p->list);
2817 else
2818 p = NULL;
2819 spin_unlock(&nfs_referral_count_list_lock);
2820 kfree(p);
2821}
2822
01194981
AV		 2823static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2824 const char *export_path)
c02d7adf 2825{
01194981 2826 struct dentry *dentry;
5352d3b6 2827 int err;
c02d7adf 2828
5352d3b6
AV		 2829 if (IS_ERR(root_mnt))
2830 return ERR_CAST(root_mnt);
2831
2832 err = nfs_referral_loop_protect();
2833 if (err) {
ea441d11 2834 mntput(root_mnt);
5352d3b6 2835 return ERR_PTR(err);
ea441d11 2836 }
c02d7adf 2837
ea441d11
AV		 2838 dentry = mount_subtree(root_mnt, export_path);
2839 nfs_referral_loop_unprotect();
c02d7adf 2840
01194981 2841 return dentry;
c02d7adf
TM		 2842}
2843
01194981
AV		 2844static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2845 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2846{
2847 char *export_path;
2848 struct vfsmount *root_mnt;
01194981 2849 struct dentry *res;
a6fe23be
CL		 2850
2851 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2852
2853 export_path = data->nfs_server.export_path;
2854 data->nfs_server.export_path = "/";
2855 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2856 data->nfs_server.hostname);
2857 data->nfs_server.export_path = export_path;
2858
5352d3b6 2859 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2860
01194981
AV		 2861 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2862 IS_ERR(res) ? PTR_ERR(res) : 0,
2863 IS_ERR(res) ? " [error]" : "");
2864 return res;
a6fe23be
CL		 2865}
2866
c02d7adf
TM		 2867/*
2868 * Get the superblock for an NFS4 mountpoint
2869 */
01194981
AV		 2870static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2871 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2872{
2873 struct nfs_parsed_mount_data *data;
c02d7adf 2874 int error = -ENOMEM;
01194981 2875 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2876
db833351 2877 data = nfs_alloc_parsed_mount_data();
c02d7adf 2878 if (data == NULL)
8a0d551a 2879 goto out;
c02d7adf
TM		 2880
2881 /* Validate the mount data */
2882 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2883 if (error < 0) {
2884 res = ERR_PTR(error);
c02d7adf 2885 goto out;
01194981 2886 }
c02d7adf 2887
01194981
AV		 2888 res = nfs4_try_mount(flags, dev_name, data);
2889 if (IS_ERR(res))
2890 error = PTR_ERR(res);
c02d7adf
TM		 2891
2892out:
8a0d551a 2893 nfs_free_parsed_mount_data(data);
01194981 2894 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2895 error != 0 ? " [error]" : "");
01194981 2896 return res;
c02d7adf
TM		 2897}
2898
f7b422b1
DH		 2899static void nfs4_kill_super(struct super_block *sb)
2900{
2901 struct nfs_server *server = NFS_SB(sb);
2902
0f3e66c6 2903 dprintk("--> %s\n", __func__);
515d8611 2904 nfs_super_return_all_delegations(sb);
f7b422b1 2905 kill_anon_super(sb);
08734048 2906 nfs_fscache_release_super_cookie(sb);
54ceac45 2907 nfs_free_server(server);
0f3e66c6 2908 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2909}
2910
2911/*
54ceac45 2912 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2913 */
31f43471
AV		 2914static struct dentry *
2915nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2916 const char *dev_name, void *raw_data)
f7b422b1 2917{
8c958e0c
BS		 2918 struct nfs_mount_info mount_info = {
2919 .fill_super = nfs4_clone_super,
3d176e3f 2920 .set_security = nfs_clone_sb_security,
8c958e0c 2921 .cloned = raw_data,
e89a5a43 2922 };
8c958e0c 2923 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
f7b422b1
DH		 2924}
2925
31f43471
AV		 2926static struct dentry *
2927nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2928 const char *dev_name, void *raw_data)
f7b422b1 2929{
21e4b82e
BS		 2930 struct nfs_mount_info mount_info = {
2931 .fill_super = nfs4_fill_super,
2932 .set_security = nfs_clone_sb_security,
2933 .cloned = raw_data,
2934 };
54ceac45 2935 struct nfs_server *server;
21e4b82e 2936 struct dentry *mntroot = ERR_PTR(-ENOMEM);
4f727296 2937 struct nfs_fh *mntfh;
54ceac45
DH		 2938
2939 dprintk("--> nfs4_referral_get_sb()\n");
2940
4f727296 2941 mntfh = nfs_alloc_fhandle();
21e4b82e
BS		 2942 if (mount_info.cloned == NULL || mntfh == NULL)
2943 goto out;
4f727296 2944
54ceac45 2945 /* create a new volume representation */
21e4b82e 2946 server = nfs4_create_referral_server(mount_info.cloned, mntfh);
54ceac45 2947 if (IS_ERR(server)) {
21e4b82e
BS		 2948 mntroot = ERR_CAST(server);
2949 goto out;
e9cc6c23 2950 }
54ceac45 2951
21e4b82e
BS		 2952 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, mntfh, &mount_info);
2953out:
4f727296 2954 nfs_free_fhandle(mntfh);
31f43471 2955 return mntroot;
f7b422b1
DH		 2956}
2957
c02d7adf
TM		 2958/*
2959 * Create an NFS4 server record on referral traversal
2960 */
01194981
AV		 2961static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2962 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2963{
2964 struct nfs_clone_mount *data = raw_data;
2965 char *export_path;
2966 struct vfsmount *root_mnt;
01194981 2967 struct dentry *res;
c02d7adf 2968
01194981 2969 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 2970
2971 export_path = data->mnt_path;
2972 data->mnt_path = "/";
2973
2974 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2975 flags, data, data->hostname);
2976 data->mnt_path = export_path;
2977
5352d3b6 2978 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 2979 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2980 IS_ERR(res) ? PTR_ERR(res) : 0,
2981 IS_ERR(res) ? " [error]" : "");
2982 return res;
c02d7adf
TM		 2983}
2984
54ceac45 2985#endif /* CONFIG_NFS_V4 */
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