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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <[email protected]>, 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 * [email protected]
13 *
14 * Split from inode.c by David Howells <[email protected]>
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>
f7b422b1
DH		 55
56#include <asm/system.h>
57#include <asm/uaccess.h>
58
59#include "nfs4_fs.h"
60#include "callback.h"
61#include "delegation.h"
62#include "iostat.h"
63#include "internal.h"
08734048 64#include "fscache.h"
ae50c0b5 65#include "pnfs.h"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
1e657bd5
PZ		 69#ifdef CONFIG_NFS_V3
70#define NFS_DEFAULT_VERSION 3
71#else
72#define NFS_DEFAULT_VERSION 2
73#endif
74
bf0fd768
CL		 75enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
bf0fd768
CL		 78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
764302cc 82 Opt_v2, Opt_v3, Opt_v4,
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,
ad879cef 100 Opt_nfsvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
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" },
135 { Opt_v2, "v2" },
136 { Opt_v3, "v3" },
764302cc 137 { Opt_v4, "v4" },
bf0fd768
CL		 138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
2cf7ff7a 140 { Opt_rdma, "rdma" },
bf0fd768
CL		 141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
b797cac7 149 { Opt_fscache, "fsc" },
b797cac7 150 { Opt_nofscache, "nofsc" },
bf0fd768 151
a5a16bae
CL		 152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 168 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
33832034 175 { Opt_mounthost, "mounthost=%s" },
0ac83779 176 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 177
7973c1f1 178 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 179 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 180 { Opt_local_lock, "local_lock=%s" },
7973c1f1 181
bf0fd768
CL		 182 { Opt_err, NULL }
183};
184
185enum {
ee671b01 186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 187
188 Opt_xprt_err
189};
190
a447c093 191static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 192 { Opt_xprt_udp, "udp" },
ee671b01 193 { Opt_xprt_udp6, "udp6" },
bf0fd768 194 { Opt_xprt_tcp, "tcp" },
ee671b01 195 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 196 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 197
198 { Opt_xprt_err, NULL }
199};
200
201enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208};
209
a447c093 210static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
8d042218
OK		 223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
bf0fd768
CL		 227 { Opt_sec_err, NULL }
228};
229
7973c1f1
TM		 230enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235};
236
237static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244};
245
5eebde23
SJ		 246enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251};
252
253static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260};
261
bf0fd768 262
42faad99 263static void nfs_umount_begin(struct super_block *);
816724e6 264static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 265static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 266static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 267static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 268static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 269static struct dentry *nfs_fs_mount(struct file_system_type *,
270 int, const char *, void *);
31f43471
AV		 271static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data);
387c149b 273static void nfs_put_super(struct super_block *);
f7b422b1 274static void nfs_kill_super(struct super_block *);
48b605f8 275static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 276
277static struct file_system_type nfs_fs_type = {
278 .owner = THIS_MODULE,
279 .name = "nfs",
01194981 280 .mount = nfs_fs_mount,
f7b422b1 281 .kill_sb = nfs_kill_super,
349457cc 282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 283};
284
54ceac45 285struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 286 .owner = THIS_MODULE,
287 .name = "nfs",
31f43471 288 .mount = nfs_xdev_mount,
f7b422b1 289 .kill_sb = nfs_kill_super,
349457cc 290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 291};
292
ee9b6d61 293static const struct super_operations nfs_sops = {
f7b422b1
DH		 294 .alloc_inode = nfs_alloc_inode,
295 .destroy_inode = nfs_destroy_inode,
296 .write_inode = nfs_write_inode,
387c149b 297 .put_super = nfs_put_super,
f7b422b1 298 .statfs = nfs_statfs,
b57922d9 299 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 300 .umount_begin = nfs_umount_begin,
301 .show_options = nfs_show_options,
c7f404b4
AV		 302 .show_devname = nfs_show_devname,
303 .show_path = nfs_show_path,
f7b422b1 304 .show_stats = nfs_show_stats,
48b605f8 305 .remount_fs = nfs_remount,
f7b422b1
DH		 306};
307
308#ifdef CONFIG_NFS_V4
7630c852
CL		 309static int nfs4_validate_text_mount_data(void *options,
310 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 311static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
312 struct nfs_parsed_mount_data *data);
313static struct dentry *nfs4_mount(struct file_system_type *fs_type,
314 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 315static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
316 int flags, const char *dev_name, void *raw_data);
317static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *raw_data);
01194981
AV		 319static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
320 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 321static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
322 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 323static void nfs4_kill_super(struct super_block *sb);
324
325static struct file_system_type nfs4_fs_type = {
326 .owner = THIS_MODULE,
327 .name = "nfs4",
01194981 328 .mount = nfs4_mount,
f7b422b1 329 .kill_sb = nfs4_kill_super,
349457cc 330 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 331};
332
c02d7adf
TM		 333static struct file_system_type nfs4_remote_fs_type = {
334 .owner = THIS_MODULE,
335 .name = "nfs4",
31f43471 336 .mount = nfs4_remote_mount,
c02d7adf
TM		 337 .kill_sb = nfs4_kill_super,
338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
339};
340
54ceac45 341struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 342 .owner = THIS_MODULE,
343 .name = "nfs4",
31f43471 344 .mount = nfs4_xdev_mount,
f7b422b1 345 .kill_sb = nfs4_kill_super,
349457cc 346 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 347};
348
c02d7adf
TM		 349static struct file_system_type nfs4_remote_referral_fs_type = {
350 .owner = THIS_MODULE,
351 .name = "nfs4",
31f43471 352 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 353 .kill_sb = nfs4_kill_super,
354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
355};
356
54ceac45 357struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 358 .owner = THIS_MODULE,
359 .name = "nfs4",
01194981 360 .mount = nfs4_referral_mount,
f7b422b1 361 .kill_sb = nfs4_kill_super,
349457cc 362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 363};
364
ee9b6d61 365static const struct super_operations nfs4_sops = {
f7b422b1
DH		 366 .alloc_inode = nfs_alloc_inode,
367 .destroy_inode = nfs_destroy_inode,
368 .write_inode = nfs_write_inode,
387c149b 369 .put_super = nfs_put_super,
f7b422b1 370 .statfs = nfs_statfs,
b57922d9 371 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 372 .umount_begin = nfs_umount_begin,
373 .show_options = nfs_show_options,
c7f404b4
AV		 374 .show_devname = nfs_show_devname,
375 .show_path = nfs_show_path,
f7b422b1 376 .show_stats = nfs_show_stats,
48b605f8 377 .remount_fs = nfs_remount,
f7b422b1
DH		 378};
379#endif
380
8e1f936b
RR		 381static struct shrinker acl_shrinker = {
382 .shrink = nfs_access_cache_shrinker,
383 .seeks = DEFAULT_SEEKS,
384};
979df72e 385
f7b422b1
DH		 386/*
387 * Register the NFS filesystems
388 */
389int __init register_nfs_fs(void)
390{
391 int ret;
392
393 ret = register_filesystem(&nfs_fs_type);
394 if (ret < 0)
395 goto error_0;
396
f7b422b1
DH		 397 ret = nfs_register_sysctl();
398 if (ret < 0)
399 goto error_1;
89a09141 400#ifdef CONFIG_NFS_V4
f7b422b1
DH		 401 ret = register_filesystem(&nfs4_fs_type);
402 if (ret < 0)
403 goto error_2;
404#endif
8e1f936b 405 register_shrinker(&acl_shrinker);
f7b422b1
DH		 406 return 0;
407
408#ifdef CONFIG_NFS_V4
409error_2:
410 nfs_unregister_sysctl();
89a09141 411#endif
f7b422b1
DH		 412error_1:
413 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 414error_0:
415 return ret;
416}
417
418/*
419 * Unregister the NFS filesystems
420 */
421void __exit unregister_nfs_fs(void)
422{
8e1f936b 423 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 424#ifdef CONFIG_NFS_V4
425 unregister_filesystem(&nfs4_fs_type);
f7b422b1 426#endif
49af7ee1 427 nfs_unregister_sysctl();
f7b422b1
DH		 428 unregister_filesystem(&nfs_fs_type);
429}
430
1daef0a8 431void nfs_sb_active(struct super_block *sb)
ef818a28 432{
1daef0a8 433 struct nfs_server *server = NFS_SB(sb);
ef818a28 434
1daef0a8
TM		 435 if (atomic_inc_return(&server->active) == 1)
436 atomic_inc(&sb->s_active);
ef818a28
SD		 437}
438
1daef0a8 439void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 440{
441 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 442
443 if (atomic_dec_and_test(&server->active))
444 deactivate_super(sb);
ef818a28
SD		 445}
446
f7b422b1
DH		 447/*
448 * Deliver file system statistics to userspace
449 */
816724e6 450static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 451{
0c7d90cf 452 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 453 unsigned char blockbits;
454 unsigned long blockres;
0c7d90cf 455 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 456 struct nfs_fsstat res;
457 int error = -ENOMEM;
458
459 res.fattr = nfs_alloc_fattr();
460 if (res.fattr == NULL)
461 goto out_err;
f7b422b1 462
8fa5c000 463 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 464 if (unlikely(error == -ESTALE)) {
465 struct dentry *pd_dentry;
466
467 pd_dentry = dget_parent(dentry);
468 if (pd_dentry != NULL) {
469 nfs_zap_caches(pd_dentry->d_inode);
470 dput(pd_dentry);
471 }
472 }
ca7e9a0d 473 nfs_free_fattr(res.fattr);
f7b422b1
DH		 474 if (error < 0)
475 goto out_err;
ca7e9a0d 476
1a0ba9ae 477 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 478
479 /*
480 * Current versions of glibc do not correctly handle the
481 * case where f_frsize != f_bsize. Eventually we want to
482 * report the value of wtmult in this field.
483 */
0c7d90cf 484 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 485
486 /*
487 * On most *nix systems, f_blocks, f_bfree, and f_bavail
488 * are reported in units of f_frsize. Linux hasn't had
489 * an f_frsize field in its statfs struct until recently,
490 * thus historically Linux's sys_statfs reports these
491 * fields in units of f_bsize.
492 */
0c7d90cf
DH		 493 buf->f_bsize = dentry->d_sb->s_blocksize;
494 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 495 blockres = (1 << blockbits) - 1;
496 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
497 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
498 buf->f_bavail = (res.abytes + blockres) >> blockbits;
499
500 buf->f_files = res.tfiles;
501 buf->f_ffree = res.afiles;
502
503 buf->f_namelen = server->namelen;
1a0ba9ae 504
f7b422b1
DH		 505 return 0;
506
507 out_err:
3110ff80 508 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 509 return error;
f7b422b1
DH		 510}
511
7d4e2747
DH		 512/*
513 * Map the security flavour number to a name
514 */
81039f1f
TM		 515static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
516{
7d4e2747 517 static const struct {
81039f1f
TM		 518 rpc_authflavor_t flavour;
519 const char *str;
520 } sec_flavours[] = {
521 { RPC_AUTH_NULL, "null" },
522 { RPC_AUTH_UNIX, "sys" },
523 { RPC_AUTH_GSS_KRB5, "krb5" },
524 { RPC_AUTH_GSS_KRB5I, "krb5i" },
525 { RPC_AUTH_GSS_KRB5P, "krb5p" },
526 { RPC_AUTH_GSS_LKEY, "lkey" },
527 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
528 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
529 { RPC_AUTH_GSS_SPKM, "spkm" },
530 { RPC_AUTH_GSS_SPKMI, "spkmi" },
531 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 532 { UINT_MAX, "unknown" }
81039f1f
TM		 533 };
534 int i;
535
4d81cd16 536 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 537 if (sec_flavours[i].flavour == flavour)
538 break;
539 }
540 return sec_flavours[i].str;
541}
542
ee671b01
JL		 543static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
544 int showdefaults)
545{
546 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
547
548 seq_printf(m, ",mountproto=");
549 switch (sap->sa_family) {
550 case AF_INET:
551 switch (nfss->mountd_protocol) {
552 case IPPROTO_UDP:
553 seq_printf(m, RPCBIND_NETID_UDP);
554 break;
555 case IPPROTO_TCP:
556 seq_printf(m, RPCBIND_NETID_TCP);
557 break;
558 default:
559 if (showdefaults)
560 seq_printf(m, "auto");
561 }
562 break;
563 case AF_INET6:
564 switch (nfss->mountd_protocol) {
565 case IPPROTO_UDP:
566 seq_printf(m, RPCBIND_NETID_UDP6);
567 break;
568 case IPPROTO_TCP:
569 seq_printf(m, RPCBIND_NETID_TCP6);
570 break;
571 default:
572 if (showdefaults)
573 seq_printf(m, "auto");
574 }
575 break;
576 default:
577 if (showdefaults)
578 seq_printf(m, "auto");
579 }
580}
581
82d101d5
CL		 582static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
583 int showdefaults)
584{
585 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
586
d5eff1a3
BS		 587 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
588 return;
589
82d101d5
CL		 590 switch (sap->sa_family) {
591 case AF_INET: {
592 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 593 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 594 break;
595 }
596 case AF_INET6: {
597 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 598 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 599 break;
600 }
601 default:
602 if (showdefaults)
603 seq_printf(m, ",mountaddr=unspecified");
604 }
605
606 if (nfss->mountd_version || showdefaults)
607 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 608 if ((nfss->mountd_port &&
609 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
610 showdefaults)
82d101d5
CL		 611 seq_printf(m, ",mountport=%u", nfss->mountd_port);
612
ee671b01 613 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 614}
615
0be8189f
TM		 616#ifdef CONFIG_NFS_V4
617static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619{
620 struct nfs_client *clp = nfss->nfs_client;
621
622 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
623 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
624}
625#else
626static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
628{
629}
630#endif
631
f7b422b1
DH		 632/*
633 * Describe the mount options in force on this server representation
634 */
82d101d5
CL		 635static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
636 int showdefaults)
f7b422b1 637{
509de811 638 static const struct proc_nfs_info {
f7b422b1 639 int flag;
509de811
DH		 640 const char *str;
641 const char *nostr;
f7b422b1
DH		 642 } nfs_info[] = {
643 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 644 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 645 { NFS_MOUNT_NOCTO, ",nocto", "" },
646 { NFS_MOUNT_NOAC, ",noac", "" },
647 { NFS_MOUNT_NONLM, ",nolock", "" },
648 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 649 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 650 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
651 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 652 { 0, NULL, NULL }
653 };
509de811 654 const struct proc_nfs_info *nfs_infop;
8fa5c000 655 struct nfs_client *clp = nfss->nfs_client;
82d101d5 656 u32 version = clp->rpc_ops->version;
7c563cc9 657 int local_flock, local_fcntl;
f7b422b1 658
82d101d5 659 seq_printf(m, ",vers=%u", version);
2d767432
CL		 660 seq_printf(m, ",rsize=%u", nfss->rsize);
661 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 662 if (nfss->bsize != 0)
663 seq_printf(m, ",bsize=%u", nfss->bsize);
664 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 665 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 666 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 667 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 668 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 669 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 670 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 671 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 672 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 673 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
674 if (nfss->flags & nfs_infop->flag)
675 seq_puts(m, nfs_infop->str);
676 else
677 seq_puts(m, nfs_infop->nostr);
678 }
56928edd 679 seq_printf(m, ",proto=%s",
ee671b01 680 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 681 if (version == 4) {
682 if (nfss->port != NFS_PORT)
683 seq_printf(m, ",port=%u", nfss->port);
684 } else
685 if (nfss->port)
686 seq_printf(m, ",port=%u", nfss->port);
687
33170233
TM		 688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 691
692 if (version != 4)
693 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 694 else
695 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 696
b797cac7
DH		 697 if (nfss->options & NFS_OPTION_FSCACHE)
698 seq_printf(m, ",fsc");
9b00c643
PL		 699
700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
702 seq_printf(m, ",lookupcache=none");
703 else
704 seq_printf(m, ",lookupcache=pos");
705 }
7c563cc9
SJ		 706
707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
709
710 if (!local_flock && !local_fcntl)
711 seq_printf(m, ",local_lock=none");
712 else if (local_flock && local_fcntl)
713 seq_printf(m, ",local_lock=all");
714 else if (local_flock)
715 seq_printf(m, ",local_lock=flock");
716 else
717 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 718}
719
720/*
721 * Describe the mount options on this VFS mountpoint
722 */
34c80b1d 723static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 724{
34c80b1d 725 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 726
727 nfs_show_mount_options(m, nfss, 0);
728
5d8515ca
CL		 729 seq_printf(m, ",addr=%s",
730 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
731 RPC_DISPLAY_ADDR));
f7b422b1
DH		 732
733 return 0;
734}
45402c38
HS		 735
736#ifdef CONFIG_NFS_V4
ae50c0b5 737#ifdef CONFIG_NFS_V4_1
45402c38 738static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 739{
740 if (nfs4_has_session(server->nfs_client))
741 seq_printf(m, ",sessions");
742}
743#else
45402c38
HS		 744static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
745#endif
ae50c0b5
BF		 746#endif
747
45402c38 748#ifdef CONFIG_NFS_V4
ae50c0b5 749#ifdef CONFIG_NFS_V4_1
45402c38 750static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 751{
752 seq_printf(m, ",pnfs=");
753 if (server->pnfs_curr_ld)
754 seq_printf(m, "%s", server->pnfs_curr_ld->name);
755 else
756 seq_printf(m, "not configured");
757}
45402c38
HS		 758#else
759static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
760#endif
761#endif
f7b422b1 762
d861c630 763static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 764{
765 char *page = (char *) __get_free_page(GFP_KERNEL);
766 char *devname, *dummy;
767 int err = 0;
768 if (!page)
769 return -ENOMEM;
d861c630 770 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 771 if (IS_ERR(devname))
772 err = PTR_ERR(devname);
773 else
774 seq_escape(m, devname, " \t\n\\");
775 free_page((unsigned long)page);
776 return err;
777}
778
a6322de6 779static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 780{
781 seq_puts(m, "/");
782 return 0;
783}
784
f7b422b1
DH		 785/*
786 * Present statistical information for this VFS mountpoint
787 */
64132379 788static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 789{
790 int i, cpu;
64132379 791 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 792 struct rpc_auth *auth = nfss->client->cl_auth;
793 struct nfs_iostats totals = { };
794
795 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
796
797 /*
798 * Display all mount option settings
799 */
800 seq_printf(m, "\n\topts:\t");
64132379
AV		 801 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
802 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
803 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
804 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 805 nfs_show_mount_options(m, nfss, 1);
806
807 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
808
809 seq_printf(m, "\n\tcaps:\t");
810 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 811 seq_printf(m, ",wtmult=%u", nfss->wtmult);
812 seq_printf(m, ",dtsize=%u", nfss->dtsize);
813 seq_printf(m, ",bsize=%u", nfss->bsize);
814 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 815
816#ifdef CONFIG_NFS_V4
40c55319 817 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 818 seq_printf(m, "\n\tnfsv4:\t");
819 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
820 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
821 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 822 show_sessions(m, nfss);
823 show_pnfs(m, nfss);
f7b422b1
DH		 824 }
825#endif
826
827 /*
828 * Display security flavor in effect for this mount
829 */
2d767432 830 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 831 if (auth->au_flavor)
2d767432 832 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 833
834 /*
835 * Display superblock I/O counters
836 */
837 for_each_possible_cpu(cpu) {
838 struct nfs_iostats *stats;
839
840 preempt_disable();
841 stats = per_cpu_ptr(nfss->io_stats, cpu);
842
843 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
844 totals.events[i] += stats->events[i];
845 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
846 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 847#ifdef CONFIG_NFS_FSCACHE
848 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
849 totals.fscache[i] += stats->fscache[i];
850#endif
f7b422b1
DH		 851
852 preempt_enable();
853 }
854
855 seq_printf(m, "\n\tevents:\t");
856 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
857 seq_printf(m, "%lu ", totals.events[i]);
858 seq_printf(m, "\n\tbytes:\t");
859 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
860 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 861#ifdef CONFIG_NFS_FSCACHE
862 if (nfss->options & NFS_OPTION_FSCACHE) {
863 seq_printf(m, "\n\tfsc:\t");
864 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
865 seq_printf(m, "%Lu ", totals.bytes[i]);
866 }
867#endif
f7b422b1
DH		 868 seq_printf(m, "\n");
869
870 rpc_print_iostats(m, nfss->client);
871
872 return 0;
873}
874
875/*
876 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 877 * in response to xdev traversals and referrals
f7b422b1 878 */
42faad99 879static void nfs_umount_begin(struct super_block *sb)
f7b422b1 880{
67e55205 881 struct nfs_server *server;
fc6ae3cf
TM		 882 struct rpc_clnt *rpc;
883
67e55205 884 server = NFS_SB(sb);
fc6ae3cf
TM		 885 /* -EIO all pending I/O */
886 rpc = server->client_acl;
887 if (!IS_ERR(rpc))
888 rpc_killall_tasks(rpc);
889 rpc = server->client;
890 if (!IS_ERR(rpc))
891 rpc_killall_tasks(rpc);
f7b422b1
DH		 892}
893
c5811dbd 894static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 895{
896 struct nfs_parsed_mount_data *data;
897
898 data = kzalloc(sizeof(*data), GFP_KERNEL);
899 if (data) {
9423a08a
CL		 900 data->acregmin = NFS_DEF_ACREGMIN;
901 data->acregmax = NFS_DEF_ACREGMAX;
902 data->acdirmin = NFS_DEF_ACDIRMIN;
903 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 904 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 905 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 906 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 907 data->auth_flavors[0] = RPC_AUTH_UNIX;
908 data->auth_flavor_len = 1;
c5811dbd 909 data->version = version;
9423a08a 910 data->minorversion = 0;
8a0d551a 911 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 912 }
913 return data;
914}
915
8a0d551a
JL		 916static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
917{
918 if (data) {
919 kfree(data->client_address);
920 kfree(data->mount_server.hostname);
921 kfree(data->nfs_server.export_path);
922 kfree(data->nfs_server.hostname);
923 kfree(data->fscache_uniq);
924 security_free_mnt_opts(&data->lsm_opts);
925 kfree(data);
926 }
927}
928
fc50d58f 929/*
cdcd7f9a
CL		 930 * Sanity-check a server address provided by the mount command.
931 *
932 * Address family must be initialized, and address must not be
933 * the ANY address for that family.
fc50d58f
CL		 934 */
935static int nfs_verify_server_address(struct sockaddr *addr)
936{
937 switch (addr->sa_family) {
938 case AF_INET: {
cdcd7f9a 939 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 940 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 941 }
942 case AF_INET6: {
943 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
944 return !ipv6_addr_any(sa);
fc50d58f
CL		 945 }
946 }
947
53a0b9c4 948 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 949 return 0;
950}
951
4cfd74fc
CL		 952/*
953 * Select between a default port value and a user-specified port value.
954 * If a zero value is set, then autobind will be used.
955 */
f5855fec 956static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 957 const unsigned short default_port)
958{
f5855fec
TM		 959 if (*port == NFS_UNSPEC_PORT)
960 *port = default_port;
4cfd74fc 961
f5855fec 962 rpc_set_port(sap, *port);
4cfd74fc
CL		 963}
964
259875ef
TM		 965/*
966 * Sanity check the NFS transport protocol.
967 *
968 */
969static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
970{
971 switch (mnt->nfs_server.protocol) {
972 case XPRT_TRANSPORT_UDP:
973 case XPRT_TRANSPORT_TCP:
974 case XPRT_TRANSPORT_RDMA:
975 break;
976 default:
977 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
978 }
979}
980
981/*
982 * For text based NFSv2/v3 mounts, the mount protocol transport default
983 * settings should depend upon the specified NFS transport.
984 */
985static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
986{
987 nfs_validate_transport_protocol(mnt);
988
989 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
990 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
991 return;
992 switch (mnt->nfs_server.protocol) {
993 case XPRT_TRANSPORT_UDP:
994 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
995 break;
996 case XPRT_TRANSPORT_TCP:
997 case XPRT_TRANSPORT_RDMA:
998 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
999 }
1000}
1001
01060c89
CL		 1002/*
1003 * Parse the value of the 'sec=' option.
01060c89
CL		 1004 */
1005static int nfs_parse_security_flavors(char *value,
1006 struct nfs_parsed_mount_data *mnt)
1007{
1008 substring_t args[MAX_OPT_ARGS];
1009
1010 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1011
1012 switch (match_token(value, nfs_secflavor_tokens, args)) {
1013 case Opt_sec_none:
01060c89
CL		 1014 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1015 break;
1016 case Opt_sec_sys:
01060c89
CL		 1017 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1018 break;
1019 case Opt_sec_krb5:
01060c89
CL		 1020 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1021 break;
1022 case Opt_sec_krb5i:
01060c89
CL		 1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1024 break;
1025 case Opt_sec_krb5p:
01060c89
CL		 1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1027 break;
1028 case Opt_sec_lkey:
01060c89
CL		 1029 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1030 break;
1031 case Opt_sec_lkeyi:
01060c89
CL		 1032 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1033 break;
1034 case Opt_sec_lkeyp:
01060c89
CL		 1035 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1036 break;
1037 case Opt_sec_spkm:
01060c89
CL		 1038 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1039 break;
1040 case Opt_sec_spkmi:
01060c89
CL		 1041 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1042 break;
1043 case Opt_sec_spkmp:
01060c89
CL		 1044 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1045 break;
1046 default:
1047 return 0;
1048 }
1049
9b7160c5 1050 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1051 mnt->auth_flavor_len = 1;
01060c89
CL		 1052 return 1;
1053}
1054
c5cb09b6
RL		 1055static int nfs_get_option_str(substring_t args[], char **option)
1056{
1057 kfree(*option);
1058 *option = match_strdup(args);
1059 return !option;
1060}
1061
1062static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1063{
1064 int rc;
1065 char *string;
1066
1067 string = match_strdup(args);
1068 if (string == NULL)
1069 return -ENOMEM;
1070 rc = strict_strtoul(string, 10, option);
1071 kfree(string);
1072
1073 return rc;
1074}
1075
bf0fd768
CL		 1076/*
1077 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1078 * a data structure. The whole mount string is processed; bad options are
1079 * skipped as they are encountered. If there were no errors, return 1;
1080 * otherwise return 0 (zero).
bf0fd768
CL		 1081 */
1082static int nfs_parse_mount_options(char *raw,
1083 struct nfs_parsed_mount_data *mnt)
1084{
f9c3a380 1085 char *p, *string, *secdata;
d23c45fd 1086 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1087 unsigned short protofamily = AF_UNSPEC;
1088 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1089
1090 if (!raw) {
1091 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1092 return 1;
1093 }
1094 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1095
f9c3a380
EP		 1096 secdata = alloc_secdata();
1097 if (!secdata)
1098 goto out_nomem;
1099
1100 rc = security_sb_copy_data(raw, secdata);
1101 if (rc)
1102 goto out_security_failure;
1103
1104 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1105 if (rc)
1106 goto out_security_failure;
1107
1108 free_secdata(secdata);
1109
bf0fd768
CL		 1110 while ((p = strsep(&raw, ",")) != NULL) {
1111 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1112 unsigned long option;
1113 int token;
bf0fd768
CL		 1114
1115 if (!*p)
1116 continue;
1117
1118 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1119
1120 token = match_token(p, nfs_mount_option_tokens, args);
1121 switch (token) {
f45663ce
CL		 1122
1123 /*
1124 * boolean options: foo/nofoo
1125 */
bf0fd768
CL		 1126 case Opt_soft:
1127 mnt->flags |= NFS_MOUNT_SOFT;
1128 break;
1129 case Opt_hard:
1130 mnt->flags &= ~NFS_MOUNT_SOFT;
1131 break;
bf0fd768
CL		 1132 case Opt_posix:
1133 mnt->flags |= NFS_MOUNT_POSIX;
1134 break;
1135 case Opt_noposix:
1136 mnt->flags &= ~NFS_MOUNT_POSIX;
1137 break;
1138 case Opt_cto:
1139 mnt->flags &= ~NFS_MOUNT_NOCTO;
1140 break;
1141 case Opt_nocto:
1142 mnt->flags |= NFS_MOUNT_NOCTO;
1143 break;
1144 case Opt_ac:
1145 mnt->flags &= ~NFS_MOUNT_NOAC;
1146 break;
1147 case Opt_noac:
1148 mnt->flags |= NFS_MOUNT_NOAC;
1149 break;
1150 case Opt_lock:
1151 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1152 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1153 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1154 break;
1155 case Opt_nolock:
1156 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1157 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1158 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1159 break;
1160 case Opt_v2:
1161 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1162 mnt->version = 2;
bf0fd768
CL		 1163 break;
1164 case Opt_v3:
1165 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1166 mnt->version = 3;
bf0fd768 1167 break;
764302cc
CL		 1168 case Opt_v4:
1169 mnt->flags &= ~NFS_MOUNT_VER3;
1170 mnt->version = 4;
1171 break;
bf0fd768
CL		 1172 case Opt_udp:
1173 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1174 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1175 break;
1176 case Opt_tcp:
1177 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1178 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1179 break;
2cf7ff7a
TT		 1180 case Opt_rdma:
1181 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1182 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1183 xprt_load_transport(p);
2cf7ff7a 1184 break;
bf0fd768
CL		 1185 case Opt_acl:
1186 mnt->flags &= ~NFS_MOUNT_NOACL;
1187 break;
1188 case Opt_noacl:
1189 mnt->flags |= NFS_MOUNT_NOACL;
1190 break;
1191 case Opt_rdirplus:
1192 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1193 break;
1194 case Opt_nordirplus:
1195 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1196 break;
75180df2
TM		 1197 case Opt_sharecache:
1198 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1199 break;
1200 case Opt_nosharecache:
1201 mnt->flags |= NFS_MOUNT_UNSHARED;
1202 break;
d740351b
CL		 1203 case Opt_resvport:
1204 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1205 break;
1206 case Opt_noresvport:
1207 mnt->flags |= NFS_MOUNT_NORESVPORT;
1208 break;
b797cac7
DH		 1209 case Opt_fscache:
1210 mnt->options |= NFS_OPTION_FSCACHE;
1211 kfree(mnt->fscache_uniq);
1212 mnt->fscache_uniq = NULL;
1213 break;
1214 case Opt_nofscache:
1215 mnt->options &= ~NFS_OPTION_FSCACHE;
1216 kfree(mnt->fscache_uniq);
1217 mnt->fscache_uniq = NULL;
1218 break;
bf0fd768 1219
f45663ce
CL		 1220 /*
1221 * options that take numeric values
1222 */
bf0fd768 1223 case Opt_port:
c5cb09b6
RL		 1224 if (nfs_get_option_ul(args, &option) ||
1225 option > USHRT_MAX)
d23c45fd
CL		 1226 goto out_invalid_value;
1227 mnt->nfs_server.port = option;
bf0fd768
CL		 1228 break;
1229 case Opt_rsize:
c5cb09b6 1230 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1231 goto out_invalid_value;
1232 mnt->rsize = option;
bf0fd768
CL		 1233 break;
1234 case Opt_wsize:
c5cb09b6 1235 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1236 goto out_invalid_value;
1237 mnt->wsize = option;
bf0fd768
CL		 1238 break;
1239 case Opt_bsize:
c5cb09b6 1240 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1241 goto out_invalid_value;
1242 mnt->bsize = option;
bf0fd768
CL		 1243 break;
1244 case Opt_timeo:
c5cb09b6 1245 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1246 goto out_invalid_value;
1247 mnt->timeo = option;
bf0fd768
CL		 1248 break;
1249 case Opt_retrans:
c5cb09b6 1250 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1251 goto out_invalid_value;
1252 mnt->retrans = option;
bf0fd768
CL		 1253 break;
1254 case Opt_acregmin:
c5cb09b6 1255 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1256 goto out_invalid_value;
1257 mnt->acregmin = option;
bf0fd768
CL		 1258 break;
1259 case Opt_acregmax:
c5cb09b6 1260 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1261 goto out_invalid_value;
1262 mnt->acregmax = option;
bf0fd768
CL		 1263 break;
1264 case Opt_acdirmin:
c5cb09b6 1265 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1266 goto out_invalid_value;
1267 mnt->acdirmin = option;
bf0fd768
CL		 1268 break;
1269 case Opt_acdirmax:
c5cb09b6 1270 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1271 goto out_invalid_value;
1272 mnt->acdirmax = option;
bf0fd768
CL		 1273 break;
1274 case Opt_actimeo:
c5cb09b6 1275 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1276 goto out_invalid_value;
1277 mnt->acregmin = mnt->acregmax =
1278 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1279 break;
1280 case Opt_namelen:
c5cb09b6 1281 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1282 goto out_invalid_value;
1283 mnt->namlen = option;
bf0fd768
CL		 1284 break;
1285 case Opt_mountport:
c5cb09b6
RL		 1286 if (nfs_get_option_ul(args, &option) ||
1287 option > USHRT_MAX)
d23c45fd
CL		 1288 goto out_invalid_value;
1289 mnt->mount_server.port = option;
bf0fd768 1290 break;
bf0fd768 1291 case Opt_mountvers:
c5cb09b6 1292 if (nfs_get_option_ul(args, &option) ||
f45663ce 1293 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1294 option > NFS_MNT3_VERSION)
1295 goto out_invalid_value;
1296 mnt->mount_server.version = option;
bf0fd768 1297 break;
bf0fd768 1298 case Opt_nfsvers:
c5cb09b6 1299 if (nfs_get_option_ul(args, &option))
d23c45fd 1300 goto out_invalid_value;
bf0fd768 1301 switch (option) {
f45663ce 1302 case NFS2_VERSION:
bf0fd768 1303 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1304 mnt->version = 2;
bf0fd768 1305 break;
f45663ce 1306 case NFS3_VERSION:
bf0fd768 1307 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1308 mnt->version = 3;
1309 break;
764302cc
CL		 1310 case NFS4_VERSION:
1311 mnt->flags &= ~NFS_MOUNT_VER3;
1312 mnt->version = 4;
bf0fd768
CL		 1313 break;
1314 default:
d23c45fd 1315 goto out_invalid_value;
bf0fd768
CL		 1316 }
1317 break;
3fd5be9e 1318 case Opt_minorversion:
c5cb09b6 1319 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1320 goto out_invalid_value;
1321 if (option > NFS4_MAX_MINOR_VERSION)
1322 goto out_invalid_value;
1323 mnt->minorversion = option;
3fd5be9e 1324 break;
bf0fd768 1325
f45663ce
CL		 1326 /*
1327 * options that take text values
1328 */
bf0fd768
CL		 1329 case Opt_sec:
1330 string = match_strdup(args);
1331 if (string == NULL)
1332 goto out_nomem;
01060c89 1333 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1334 kfree(string);
f45663ce 1335 if (!rc) {
f45663ce
CL		 1336 dfprintk(MOUNT, "NFS: unrecognized "
1337 "security flavor\n");
d23c45fd 1338 return 0;
f45663ce 1339 }
bf0fd768
CL		 1340 break;
1341 case Opt_proto:
1342 string = match_strdup(args);
1343 if (string == NULL)
1344 goto out_nomem;
1345 token = match_token(string,
1346 nfs_xprt_protocol_tokens, args);
bf0fd768 1347
ee671b01 1348 protofamily = AF_INET;
bf0fd768 1349 switch (token) {
ee671b01
JL		 1350 case Opt_xprt_udp6:
1351 protofamily = AF_INET6;
fdb66ff4 1352 case Opt_xprt_udp:
bf0fd768 1353 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1354 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1355 break;
ee671b01
JL		 1356 case Opt_xprt_tcp6:
1357 protofamily = AF_INET6;
fdb66ff4 1358 case Opt_xprt_tcp:
bf0fd768 1359 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1360 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1361 break;
2cf7ff7a
TT		 1362 case Opt_xprt_rdma:
1363 /* vector side protocols to TCP */
1364 mnt->flags |= NFS_MOUNT_TCP;
1365 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1366 xprt_load_transport(string);
2cf7ff7a 1367 break;
bf0fd768 1368 default:
f45663ce
CL		 1369 dfprintk(MOUNT, "NFS: unrecognized "
1370 "transport protocol\n");
4223a4a1 1371 kfree(string);
d23c45fd 1372 return 0;
bf0fd768 1373 }
c5cb09b6 1374 kfree(string);
bf0fd768
CL		 1375 break;
1376 case Opt_mountproto:
1377 string = match_strdup(args);
1378 if (string == NULL)
1379 goto out_nomem;
1380 token = match_token(string,
1381 nfs_xprt_protocol_tokens, args);
d508afb4 1382 kfree(string);
bf0fd768 1383
ee671b01 1384 mountfamily = AF_INET;
bf0fd768 1385 switch (token) {
ee671b01
JL		 1386 case Opt_xprt_udp6:
1387 mountfamily = AF_INET6;
fdb66ff4 1388 case Opt_xprt_udp:
0896a725 1389 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1390 break;
ee671b01
JL		 1391 case Opt_xprt_tcp6:
1392 mountfamily = AF_INET6;
fdb66ff4 1393 case Opt_xprt_tcp:
0896a725 1394 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1395 break;
2cf7ff7a 1396 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1397 default:
f45663ce
CL		 1398 dfprintk(MOUNT, "NFS: unrecognized "
1399 "transport protocol\n");
d23c45fd 1400 return 0;
bf0fd768
CL		 1401 }
1402 break;
1403 case Opt_addr:
1404 string = match_strdup(args);
1405 if (string == NULL)
1406 goto out_nomem;
53a0b9c4
CL		 1407 mnt->nfs_server.addrlen =
1408 rpc_pton(string, strlen(string),
1409 (struct sockaddr *)
1410 &mnt->nfs_server.address,
1411 sizeof(mnt->nfs_server.address));
bf0fd768 1412 kfree(string);
53a0b9c4
CL		 1413 if (mnt->nfs_server.addrlen == 0)
1414 goto out_invalid_address;
bf0fd768
CL		 1415 break;
1416 case Opt_clientaddr:
c5cb09b6 1417 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1418 goto out_nomem;
bf0fd768 1419 break;
33832034 1420 case Opt_mounthost:
c5cb09b6
RL		 1421 if (nfs_get_option_str(args,
1422 &mnt->mount_server.hostname))
33832034 1423 goto out_nomem;
33832034 1424 break;
0ac83779 1425 case Opt_mountaddr:
bf0fd768
CL		 1426 string = match_strdup(args);
1427 if (string == NULL)
1428 goto out_nomem;
53a0b9c4
CL		 1429 mnt->mount_server.addrlen =
1430 rpc_pton(string, strlen(string),
1431 (struct sockaddr *)
1432 &mnt->mount_server.address,
1433 sizeof(mnt->mount_server.address));
bf0fd768 1434 kfree(string);
53a0b9c4
CL		 1435 if (mnt->mount_server.addrlen == 0)
1436 goto out_invalid_address;
bf0fd768 1437 break;
7973c1f1
TM		 1438 case Opt_lookupcache:
1439 string = match_strdup(args);
1440 if (string == NULL)
1441 goto out_nomem;
1442 token = match_token(string,
1443 nfs_lookupcache_tokens, args);
1444 kfree(string);
1445 switch (token) {
1446 case Opt_lookupcache_all:
1447 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1448 break;
1449 case Opt_lookupcache_positive:
1450 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1451 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1452 break;
1453 case Opt_lookupcache_none:
1454 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1455 break;
1456 default:
7973c1f1
TM		 1457 dfprintk(MOUNT, "NFS: invalid "
1458 "lookupcache argument\n");
d23c45fd 1459 return 0;
7973c1f1
TM		 1460 };
1461 break;
a6d5ff64 1462 case Opt_fscache_uniq:
c5cb09b6 1463 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1464 goto out_nomem;
a6d5ff64
CL		 1465 mnt->options |= NFS_OPTION_FSCACHE;
1466 break;
5eebde23
SJ		 1467 case Opt_local_lock:
1468 string = match_strdup(args);
1469 if (string == NULL)
1470 goto out_nomem;
1471 token = match_token(string, nfs_local_lock_tokens,
1472 args);
1473 kfree(string);
1474 switch (token) {
1475 case Opt_local_lock_all:
1476 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1477 NFS_MOUNT_LOCAL_FCNTL);
1478 break;
1479 case Opt_local_lock_flock:
1480 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1481 break;
1482 case Opt_local_lock_posix:
1483 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1484 break;
1485 case Opt_local_lock_none:
1486 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1487 NFS_MOUNT_LOCAL_FCNTL);
1488 break;
1489 default:
1490 dfprintk(MOUNT, "NFS: invalid "
1491 "local_lock argument\n");
1492 return 0;
1493 };
1494 break;
bf0fd768 1495
f45663ce
CL		 1496 /*
1497 * Special options
1498 */
1499 case Opt_sloppy:
1500 sloppy = 1;
1501 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1502 break;
bf0fd768
CL		 1503 case Opt_userspace:
1504 case Opt_deprecated:
d33e4dfe
CL		 1505 dfprintk(MOUNT, "NFS: ignoring mount option "
1506 "'%s'\n", p);
bf0fd768
CL		 1507 break;
1508
1509 default:
d23c45fd 1510 invalid_option = 1;
f45663ce
CL		 1511 dfprintk(MOUNT, "NFS: unrecognized mount option "
1512 "'%s'\n", p);
bf0fd768
CL		 1513 }
1514 }
1515
d23c45fd
CL		 1516 if (!sloppy && invalid_option)
1517 return 0;
1518
ee671b01
JL		 1519 /*
1520 * verify that any proto=/mountproto= options match the address
1521 * familiies in the addr=/mountaddr= options.
1522 */
1523 if (protofamily != AF_UNSPEC &&
1524 protofamily != mnt->nfs_server.address.ss_family)
1525 goto out_proto_mismatch;
1526
1527 if (mountfamily != AF_UNSPEC) {
1528 if (mnt->mount_server.addrlen) {
1529 if (mountfamily != mnt->mount_server.address.ss_family)
1530 goto out_mountproto_mismatch;
1531 } else {
1532 if (mountfamily != mnt->nfs_server.address.ss_family)
1533 goto out_mountproto_mismatch;
1534 }
1535 }
1536
bf0fd768
CL		 1537 return 1;
1538
ee671b01
JL		 1539out_mountproto_mismatch:
1540 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1541 "option\n");
1542 return 0;
1543out_proto_mismatch:
1544 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1545 return 0;
53a0b9c4
CL		 1546out_invalid_address:
1547 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1548 return 0;
d23c45fd 1549out_invalid_value:
53a0b9c4 1550 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1551 return 0;
bf0fd768
CL		 1552out_nomem:
1553 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1554 return 0;
f9c3a380
EP		 1555out_security_failure:
1556 free_secdata(secdata);
1557 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1558 return 0;
bf0fd768
CL		 1559}
1560
ec88f28d
CL		 1561/*
1562 * Match the requested auth flavors with the list returned by
1563 * the server. Returns zero and sets the mount's authentication
1564 * flavor on success; returns -EACCES if server does not support
1565 * the requested flavor.
1566 */
1567static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1568 struct nfs_mount_request *request)
1569{
1570 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1571
5eecfde6
CL		 1572 /*
1573 * Certain releases of Linux's mountd return an empty
1574 * flavor list. To prevent behavioral regression with
1575 * these servers (ie. rejecting mounts that used to
1576 * succeed), revert to pre-2.6.32 behavior (no checking)
1577 * if the returned flavor list is empty.
1578 */
1579 if (server_authlist_len == 0)
1580 return 0;
1581
ec88f28d
CL		 1582 /*
1583 * We avoid sophisticated negotiating here, as there are
1584 * plenty of cases where we can get it wrong, providing
1585 * either too little or too much security.
1586 *
1587 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1588 * flavor listed first. However, some servers list
1589 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1590 * preferred default, in args->auth_flavors[0] if user
1591 * didn't specify sec= mount option.
1592 */
1593 for (i = 0; i < args->auth_flavor_len; i++)
1594 for (j = 0; j < server_authlist_len; j++)
1595 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1596 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1597 request->auth_flavs[j]);
1598 args->auth_flavors[0] = request->auth_flavs[j];
1599 return 0;
1600 }
1601
1602 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1603 nfs_umount(request);
1604 return -EACCES;
1605}
1606
0076d7b7
CL		 1607/*
1608 * Use the remote server's MOUNT service to request the NFS file handle
1609 * corresponding to the provided path.
1610 */
1611static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1612 struct nfs_fh *root_fh)
1613{
ec88f28d
CL		 1614 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1615 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1616 struct nfs_mount_request request = {
1617 .sap = (struct sockaddr *)
1618 &args->mount_server.address,
1619 .dirpath = args->nfs_server.export_path,
1620 .protocol = args->mount_server.protocol,
1621 .fh = root_fh,
50a737f8 1622 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1623 .auth_flav_len = &server_authlist_len,
1624 .auth_flavs = server_authlist,
c5d120f8 1625 };
4c568017 1626 int status;
0076d7b7
CL		 1627
1628 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1629 switch (args->version) {
1630 default:
1631 args->mount_server.version = NFS_MNT3_VERSION;
1632 break;
1633 case 2:
1634 args->mount_server.version = NFS_MNT_VERSION;
1635 }
0076d7b7 1636 }
c5d120f8 1637 request.version = args->mount_server.version;
0076d7b7 1638
33832034 1639 if (args->mount_server.hostname)
c5d120f8 1640 request.hostname = args->mount_server.hostname;
33832034 1641 else
c5d120f8 1642 request.hostname = args->nfs_server.hostname;
33832034 1643
0076d7b7
CL		 1644 /*
1645 * Construct the mount server's address.
1646 */
4c568017 1647 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1648 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1649 args->nfs_server.addrlen);
1650 args->mount_server.addrlen = args->nfs_server.addrlen;
1651 }
c5d120f8 1652 request.salen = args->mount_server.addrlen;
f5855fec 1653 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1654
1655 /*
1656 * Now ask the mount server to map our export path
1657 * to a file handle.
1658 */
c5d120f8 1659 status = nfs_mount(&request);
ec88f28d
CL		 1660 if (status != 0) {
1661 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1662 request.hostname, status);
1663 return status;
1664 }
0076d7b7 1665
ec88f28d
CL		 1666 /*
1667 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1668 */
1669 if (args->mount_server.version != NFS_MNT3_VERSION)
1670 return 0;
1671 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1672}
1673
c12bacec
RL		 1674/*
1675 * Split "dev_name" into "hostname:export_path".
1676 *
1677 * The leftmost colon demarks the split between the server's hostname
1678 * and the export path. If the hostname starts with a left square
1679 * bracket, then it may contain colons.
1680 *
1681 * Note: caller frees hostname and export path, even on error.
1682 */
1683static int nfs_parse_devname(const char *dev_name,
1684 char **hostname, size_t maxnamlen,
1685 char **export_path, size_t maxpathlen)
dc045898
CL		 1686{
1687 size_t len;
c12bacec 1688 char *end;
dc045898 1689
c12bacec
RL		 1690 /* Is the host name protected with square brakcets? */
1691 if (*dev_name == '[') {
1692 end = strchr(++dev_name, ']');
1693 if (end == NULL || end[1] != ':')
dc045898 1694 goto out_bad_devname;
dc045898 1695
c12bacec
RL		 1696 len = end - dev_name;
1697 end++;
1698 } else {
1699 char *comma;
dc045898 1700
c12bacec
RL		 1701 end = strchr(dev_name, ':');
1702 if (end == NULL)
1703 goto out_bad_devname;
1704 len = end - dev_name;
d1aa0825 1705
c12bacec
RL		 1706 /* kill possible hostname list: not supported */
1707 comma = strchr(dev_name, ',');
1708 if (comma != NULL && comma < end)
1709 *comma = 0;
1710 }
d1aa0825 1711
d1aa0825
CL		 1712 if (len > maxnamlen)
1713 goto out_hostname;
1714
1715 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1716 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1717 if (*hostname == NULL)
1718 goto out_nomem;
c12bacec 1719 len = strlen(++end);
d1aa0825
CL		 1720 if (len > maxpathlen)
1721 goto out_path;
1722 *export_path = kstrndup(end, len, GFP_KERNEL);
1723 if (!*export_path)
1724 goto out_nomem;
1725
c12bacec 1726 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1727 return 0;
1728
1729out_bad_devname:
1730 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1731 return -EINVAL;
1732
1733out_nomem:
1734 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1735 return -ENOMEM;
1736
1737out_hostname:
1738 dfprintk(MOUNT, "NFS: server hostname too long\n");
1739 return -ENAMETOOLONG;
1740
1741out_path:
1742 dfprintk(MOUNT, "NFS: export pathname too long\n");
1743 return -ENAMETOOLONG;
1744}
1745
f7b422b1 1746/*
54ceac45
DH		 1747 * Validate the NFS2/NFS3 mount data
1748 * - fills in the mount root filehandle
136d558c
CL		 1749 *
1750 * For option strings, user space handles the following behaviors:
1751 *
1752 * + DNS: mapping server host name to IP address ("addr=" option)
1753 *
1754 * + failure mode: how to behave if a mount request can't be handled
1755 * immediately ("fg/bg" option)
1756 *
1757 * + retry: how often to retry a mount request ("retry=" option)
1758 *
1759 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1760 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1761 */
2283f8d6
TT		 1762static int nfs_validate_mount_data(void *options,
1763 struct nfs_parsed_mount_data *args,
136d558c
CL		 1764 struct nfs_fh *mntfh,
1765 const char *dev_name)
f7b422b1 1766{
2283f8d6 1767 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1768 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1769
5df36e78
CL		 1770 if (data == NULL)
1771 goto out_no_data;
f7b422b1 1772
54ceac45 1773 switch (data->version) {
5df36e78
CL		 1774 case 1:
1775 data->namlen = 0;
1776 case 2:
1777 data->bsize = 0;
1778 case 3:
1779 if (data->flags & NFS_MOUNT_VER3)
1780 goto out_no_v3;
1781 data->root.size = NFS2_FHSIZE;
1782 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1783 case 4:
1784 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1785 goto out_no_sec;
1786 case 5:
1787 memset(data->context, 0, sizeof(data->context));
1788 case 6:
b7e24457
TM		 1789 if (data->flags & NFS_MOUNT_VER3) {
1790 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1791 goto out_invalid_fh;
5df36e78 1792 mntfh->size = data->root.size;
764302cc
CL		 1793 args->version = 3;
1794 } else {
5df36e78 1795 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1796 args->version = 2;
1797 }
5df36e78 1798
5df36e78
CL		 1799
1800 memcpy(mntfh->data, data->root.data, mntfh->size);
1801 if (mntfh->size < sizeof(mntfh->data))
1802 memset(mntfh->data + mntfh->size, 0,
1803 sizeof(mntfh->data) - mntfh->size);
6e88e061 1804
2283f8d6
TT		 1805 /*
1806 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1807 * can deal with.
1808 */
ff3525a5 1809 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1810 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1811 args->rsize = data->rsize;
1812 args->wsize = data->wsize;
2283f8d6
TT		 1813 args->timeo = data->timeo;
1814 args->retrans = data->retrans;
1815 args->acregmin = data->acregmin;
1816 args->acregmax = data->acregmax;
1817 args->acdirmin = data->acdirmin;
1818 args->acdirmax = data->acdirmax;
4c568017 1819
4cfd74fc 1820 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1821 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1822 if (!nfs_verify_server_address(sap))
4c568017
CL		 1823 goto out_no_address;
1824
2283f8d6 1825 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1826 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1827 /* N.B. caller will free nfs_server.hostname in all cases */
1828 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1829 args->namlen = data->namlen;
1830 args->bsize = data->bsize;
dd07c947
CL		 1831
1832 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1833 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1834 if (!args->nfs_server.hostname)
1835 goto out_nomem;
f9c3a380 1836
5eebde23
SJ		 1837 if (!(data->flags & NFS_MOUNT_NONLM))
1838 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1839 NFS_MOUNT_LOCAL_FCNTL);
1840 else
1841 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1842 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1843 /*
1844 * The legacy version 6 binary mount data from userspace has a
1845 * field used only to transport selinux information into the
1846 * the kernel. To continue to support that functionality we
1847 * have a touch of selinux knowledge here in the NFS code. The
1848 * userspace code converted context=blah to just blah so we are
1849 * converting back to the full string selinux understands.
1850 */
1851 if (data->context[0]){
1852#ifdef CONFIG_SECURITY_SELINUX
1853 int rc;
1854 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1855 if (!opts_str)
1856 return -ENOMEM;
1857 strcpy(opts_str, "context=");
1858 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1859 strcat(opts_str, &data->context[0]);
1860 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1861 kfree(opts_str);
1862 if (rc)
1863 return rc;
1864#else
1865 return -EINVAL;
1866#endif
1867 }
1868
5df36e78 1869 break;
136d558c 1870 default: {
136d558c 1871 int status;
136d558c 1872
2283f8d6
TT		 1873 if (nfs_parse_mount_options((char *)options, args) == 0)
1874 return -EINVAL;
136d558c 1875
4cfd74fc 1876 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1877 goto out_no_address;
1878
764302cc
CL		 1879 if (args->version == 4)
1880#ifdef CONFIG_NFS_V4
1881 return nfs4_validate_text_mount_data(options,
1882 args, dev_name);
1883#else
1884 goto out_v4_not_compiled;
1885#endif
1886
f5855fec 1887 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1888
259875ef
TM		 1889 nfs_set_mount_transport_protocol(args);
1890
dc045898
CL		 1891 status = nfs_parse_devname(dev_name,
1892 &args->nfs_server.hostname,
1893 PAGE_SIZE,
1894 &args->nfs_server.export_path,
1895 NFS_MAXPATHLEN);
1896 if (!status)
1897 status = nfs_try_mount(args, mntfh);
136d558c 1898
dc045898
CL		 1899 kfree(args->nfs_server.export_path);
1900 args->nfs_server.export_path = NULL;
136d558c 1901
136d558c 1902 if (status)
fdc6e2c8 1903 return status;
136d558c 1904
136d558c
CL		 1905 break;
1906 }
f7b422b1 1907 }
54ceac45
DH		 1908
1909#ifndef CONFIG_NFS_V3
8a6e5deb 1910 if (args->version == 3)
5df36e78
CL		 1911 goto out_v3_not_compiled;
1912#endif /* !CONFIG_NFS_V3 */
f7b422b1 1913
5df36e78 1914 return 0;
f7b422b1 1915
5df36e78
CL		 1916out_no_data:
1917 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1918 return -EINVAL;
54ceac45 1919
5df36e78
CL		 1920out_no_v3:
1921 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1922 data->version);
1923 return -EINVAL;
f7b422b1 1924
5df36e78
CL		 1925out_no_sec:
1926 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1927 return -EINVAL;
1928
5df36e78
CL		 1929#ifndef CONFIG_NFS_V3
1930out_v3_not_compiled:
1931 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1932 return -EPROTONOSUPPORT;
1933#endif /* !CONFIG_NFS_V3 */
1934
764302cc
CL		 1935#ifndef CONFIG_NFS_V4
1936out_v4_not_compiled:
1937 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1938 return -EPROTONOSUPPORT;
1939#endif /* !CONFIG_NFS_V4 */
1940
63649bd7
CG		 1941out_nomem:
1942 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1943 return -ENOMEM;
1944
5df36e78
CL		 1945out_no_address:
1946 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1947 return -EINVAL;
1948
1949out_invalid_fh:
1950 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1951 return -EINVAL;
f7b422b1
DH		 1952}
1953
48b605f8
JL		 1954static int
1955nfs_compare_remount_data(struct nfs_server *nfss,
1956 struct nfs_parsed_mount_data *data)
1957{
1958 if (data->flags != nfss->flags ||
1959 data->rsize != nfss->rsize ||
1960 data->wsize != nfss->wsize ||
1961 data->retrans != nfss->client->cl_timeout->to_retries ||
1962 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1963 data->acregmin != nfss->acregmin / HZ ||
1964 data->acregmax != nfss->acregmax / HZ ||
1965 data->acdirmin != nfss->acdirmin / HZ ||
1966 data->acdirmax != nfss->acdirmax / HZ ||
1967 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1968 data->nfs_server.port != nfss->port ||
48b605f8 1969 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1970 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1971 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1972 return -EINVAL;
1973
1974 return 0;
1975}
1976
1977static int
1978nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1979{
1980 int error;
1981 struct nfs_server *nfss = sb->s_fs_info;
1982 struct nfs_parsed_mount_data *data;
1983 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1984 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1985 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1986
1987 /*
1988 * Userspace mount programs that send binary options generally send
1989 * them populated with default values. We have no way to know which
1990 * ones were explicitly specified. Fall back to legacy behavior and
1991 * just return success.
1992 */
31c94469
MZ		 1993 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1994 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1995 options->version <= 6))))
48b605f8
JL		 1996 return 0;
1997
1998 data = kzalloc(sizeof(*data), GFP_KERNEL);
1999 if (data == NULL)
2000 return -ENOMEM;
2001
2002 /* fill out struct with values from existing mount */
2003 data->flags = nfss->flags;
2004 data->rsize = nfss->rsize;
2005 data->wsize = nfss->wsize;
2006 data->retrans = nfss->client->cl_timeout->to_retries;
2007 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2008 data->acregmin = nfss->acregmin / HZ;
2009 data->acregmax = nfss->acregmax / HZ;
2010 data->acdirmin = nfss->acdirmin / HZ;
2011 data->acdirmax = nfss->acdirmax / HZ;
2012 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2013 data->nfs_server.port = nfss->port;
48b605f8
JL		 2014 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2015 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2016 data->nfs_server.addrlen);
2017
2018 /* overwrite those values with any that were specified */
2019 error = nfs_parse_mount_options((char *)options, data);
2020 if (error < 0)
2021 goto out;
2022
26c4c170
JL		 2023 /*
2024 * noac is a special case. It implies -o sync, but that's not
2025 * necessarily reflected in the mtab options. do_remount_sb
2026 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2027 * remount options, so we have to explicitly reset it.
2028 */
2029 if (data->flags & NFS_MOUNT_NOAC)
2030 *flags |= MS_SYNCHRONOUS;
2031
48b605f8
JL		 2032 /* compare new mount options with old ones */
2033 error = nfs_compare_remount_data(nfss, data);
2034out:
2035 kfree(data);
2036 return error;
2037}
2038
f7b422b1 2039/*
54ceac45 2040 * Initialise the common bits of the superblock
f7b422b1 2041 */
54ceac45 2042static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2043{
54ceac45 2044 struct nfs_server *server = NFS_SB(sb);
5006a76c 2045
54ceac45 2046 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2047
54ceac45
DH		 2048 /* We probably want something more informative here */
2049 snprintf(sb->s_id, sizeof(sb->s_id),
2050 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2051
54ceac45
DH		 2052 if (sb->s_blocksize == 0)
2053 sb->s_blocksize = nfs_block_bits(server->wsize,
2054 &sb->s_blocksize_bits);
f7b422b1 2055
32a88aa1
JA		 2056 sb->s_bdi = &server->backing_dev_info;
2057
54ceac45 2058 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2059}
2060
2061/*
54ceac45 2062 * Finish setting up an NFS2/3 superblock
f7b422b1 2063 */
2283f8d6
TT		 2064static void nfs_fill_super(struct super_block *sb,
2065 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2066{
2067 struct nfs_server *server = NFS_SB(sb);
5006a76c 2068
54ceac45
DH		 2069 sb->s_blocksize_bits = 0;
2070 sb->s_blocksize = 0;
2071 if (data->bsize)
2072 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2073
8a6e5deb 2074 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2075 /* The VFS shouldn't apply the umask to mode bits. We will do
2076 * so ourselves when necessary.
2077 */
2078 sb->s_flags |= MS_POSIXACL;
2079 sb->s_time_gran = 1;
816724e6 2080 }
54ceac45
DH		 2081
2082 sb->s_op = &nfs_sops;
2083 nfs_initialise_sb(sb);
f7b422b1
DH		 2084}
2085
2086/*
54ceac45 2087 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2088 */
54ceac45
DH		 2089static void nfs_clone_super(struct super_block *sb,
2090 const struct super_block *old_sb)
f7b422b1 2091{
54ceac45
DH		 2092 struct nfs_server *server = NFS_SB(sb);
2093
2094 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2095 sb->s_blocksize = old_sb->s_blocksize;
2096 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2097
8a6e5deb 2098 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2099 /* The VFS shouldn't apply the umask to mode bits. We will do
2100 * so ourselves when necessary.
f7b422b1
DH		 2101 */
2102 sb->s_flags |= MS_POSIXACL;
f7b422b1 2103 sb->s_time_gran = 1;
f7b422b1
DH		 2104 }
2105
54ceac45
DH		 2106 sb->s_op = old_sb->s_op;
2107 nfs_initialise_sb(sb);
f7b422b1
DH		 2108}
2109
275a5d24
TM		 2110static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2111{
2112 const struct nfs_server *a = s->s_fs_info;
2113 const struct rpc_clnt *clnt_a = a->client;
2114 const struct rpc_clnt *clnt_b = b->client;
2115
2116 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2117 goto Ebusy;
2118 if (a->nfs_client != b->nfs_client)
2119 goto Ebusy;
2120 if (a->flags != b->flags)
2121 goto Ebusy;
2122 if (a->wsize != b->wsize)
2123 goto Ebusy;
2124 if (a->rsize != b->rsize)
2125 goto Ebusy;
2126 if (a->acregmin != b->acregmin)
2127 goto Ebusy;
2128 if (a->acregmax != b->acregmax)
2129 goto Ebusy;
2130 if (a->acdirmin != b->acdirmin)
2131 goto Ebusy;
2132 if (a->acdirmax != b->acdirmax)
2133 goto Ebusy;
2134 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2135 goto Ebusy;
e89a5a43 2136 return 1;
275a5d24 2137Ebusy:
e89a5a43
TM		 2138 return 0;
2139}
2140
2141struct nfs_sb_mountdata {
2142 struct nfs_server *server;
2143 int mntflags;
2144};
2145
2146static int nfs_set_super(struct super_block *s, void *data)
2147{
2148 struct nfs_sb_mountdata *sb_mntdata = data;
2149 struct nfs_server *server = sb_mntdata->server;
2150 int ret;
2151
2152 s->s_flags = sb_mntdata->mntflags;
2153 s->s_fs_info = server;
8b244ff2 2154 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2155 ret = set_anon_super(s, server);
2156 if (ret == 0)
2157 server->s_dev = s->s_dev;
2158 return ret;
2159}
2160
fd00a8ff
CL		 2161static int nfs_compare_super_address(struct nfs_server *server1,
2162 struct nfs_server *server2)
2163{
2164 struct sockaddr *sap1, *sap2;
2165
2166 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2167 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2168
2169 if (sap1->sa_family != sap2->sa_family)
2170 return 0;
2171
2172 switch (sap1->sa_family) {
2173 case AF_INET: {
2174 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2175 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2176 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2177 return 0;
2178 if (sin1->sin_port != sin2->sin_port)
2179 return 0;
2180 break;
2181 }
2182 case AF_INET6: {
2183 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2184 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2185 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2186 return 0;
2187 if (sin1->sin6_port != sin2->sin6_port)
2188 return 0;
2189 break;
2190 }
2191 default:
2192 return 0;
2193 }
2194
2195 return 1;
2196}
2197
e89a5a43
TM		 2198static int nfs_compare_super(struct super_block *sb, void *data)
2199{
2200 struct nfs_sb_mountdata *sb_mntdata = data;
2201 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2202 int mntflags = sb_mntdata->mntflags;
2203
fd00a8ff 2204 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2205 return 0;
2206 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2207 if (old->flags & NFS_MOUNT_UNSHARED)
2208 return 0;
2209 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2210 return 0;
2211 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2212}
2213
fa799759
MS		 2214static int nfs_bdi_register(struct nfs_server *server)
2215{
2216 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2217}
2218
01194981
AV		 2219static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2220 int flags, const char *dev_name, void *raw_data)
f7b422b1 2221{
f7b422b1
DH		 2222 struct nfs_server *server = NULL;
2223 struct super_block *s;
33852a1f
TM		 2224 struct nfs_parsed_mount_data *data;
2225 struct nfs_fh *mntfh;
01194981 2226 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2227 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2228 struct nfs_sb_mountdata sb_mntdata = {
2229 .mntflags = flags,
2230 };
01194981 2231 int error;
33852a1f 2232
1e657bd5 2233 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2234 mntfh = nfs_alloc_fhandle();
33852a1f 2235 if (data == NULL || mntfh == NULL)
8a0d551a 2236 goto out;
f9c3a380 2237
54ceac45 2238 /* Validate the mount data */
33852a1f 2239 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2240 if (error < 0) {
2241 mntroot = ERR_PTR(error);
0655960f 2242 goto out;
01194981 2243 }
f7b422b1 2244
764302cc
CL		 2245#ifdef CONFIG_NFS_V4
2246 if (data->version == 4) {
01194981 2247 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2248 goto out;
2249 }
2250#endif /* CONFIG_NFS_V4 */
2251
54ceac45 2252 /* Get a volume representation */
33852a1f 2253 server = nfs_create_server(data, mntfh);
54ceac45 2254 if (IS_ERR(server)) {
01194981 2255 mntroot = ERR_CAST(server);
0655960f 2256 goto out;
f7b422b1 2257 }
e89a5a43 2258 sb_mntdata.server = server;
f7b422b1 2259
75180df2
TM		 2260 if (server->flags & NFS_MOUNT_UNSHARED)
2261 compare_super = NULL;
2262
fb2088cc
SP		 2263 /* -o noac implies -o sync */
2264 if (server->flags & NFS_MOUNT_NOAC)
2265 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2266
54ceac45 2267 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2268 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2269 if (IS_ERR(s)) {
01194981 2270 mntroot = ERR_CAST(s);
54ceac45 2271 goto out_err_nosb;
816724e6
TM		 2272 }
2273
54ceac45
DH		 2274 if (s->s_fs_info != server) {
2275 nfs_free_server(server);
2276 server = NULL;
fa799759
MS		 2277 } else {
2278 error = nfs_bdi_register(server);
01194981
AV		 2279 if (error) {
2280 mntroot = ERR_PTR(error);
cfbc0683 2281 goto error_splat_bdi;
01194981 2282 }
54ceac45 2283 }
f7b422b1 2284
54ceac45
DH		 2285 if (!s->s_root) {
2286 /* initial superblock/root creation */
33852a1f 2287 nfs_fill_super(s, data);
160bc160 2288 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2289 }
f7b422b1 2290
0d5839ad 2291 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2292 if (IS_ERR(mntroot))
54ceac45 2293 goto error_splat_super;
816724e6 2294
33852a1f 2295 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2296 if (error)
2297 goto error_splat_root;
2298
54ceac45 2299 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2300
2301out:
8a0d551a 2302 nfs_free_parsed_mount_data(data);
b157b06c 2303 nfs_free_fhandle(mntfh);
01194981 2304 return mntroot;
816724e6 2305
54ceac45
DH		 2306out_err_nosb:
2307 nfs_free_server(server);
0655960f 2308 goto out;
54ceac45 2309
f9c3a380
EP		 2310error_splat_root:
2311 dput(mntroot);
01194981 2312 mntroot = ERR_PTR(error);
54ceac45 2313error_splat_super:
cfbc0683
N		 2314 if (server && !s->s_root)
2315 bdi_unregister(&server->backing_dev_info);
2316error_splat_bdi:
6f5bbff9 2317 deactivate_locked_super(s);
0655960f 2318 goto out;
f7b422b1
DH		 2319}
2320
387c149b
TM		 2321/*
2322 * Ensure that we unregister the bdi before kill_anon_super
2323 * releases the device name
2324 */
2325static void nfs_put_super(struct super_block *s)
2326{
2327 struct nfs_server *server = NFS_SB(s);
2328
2329 bdi_unregister(&server->backing_dev_info);
2330}
2331
54ceac45
DH		 2332/*
2333 * Destroy an NFS2/3 superblock
2334 */
f7b422b1
DH		 2335static void nfs_kill_super(struct super_block *s)
2336{
2337 struct nfs_server *server = NFS_SB(s);
2338
2339 kill_anon_super(s);
08734048 2340 nfs_fscache_release_super_cookie(s);
54ceac45 2341 nfs_free_server(server);
f7b422b1
DH		 2342}
2343
54ceac45
DH		 2344/*
2345 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2346 */
31f43471
AV		 2347static struct dentry *
2348nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2349 const char *dev_name, void *raw_data)
f7b422b1
DH		 2350{
2351 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2352 struct super_block *s;
2353 struct nfs_server *server;
2354 struct dentry *mntroot;
75180df2 2355 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2356 struct nfs_sb_mountdata sb_mntdata = {
2357 .mntflags = flags,
2358 };
54ceac45 2359 int error;
f7b422b1 2360
31f43471 2361 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2362
54ceac45
DH		 2363 /* create a new volume representation */
2364 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2365 if (IS_ERR(server)) {
2366 error = PTR_ERR(server);
2367 goto out_err_noserver;
2368 }
e89a5a43 2369 sb_mntdata.server = server;
8fa5c000 2370
75180df2
TM		 2371 if (server->flags & NFS_MOUNT_UNSHARED)
2372 compare_super = NULL;
2373
fb2088cc
SP		 2374 /* -o noac implies -o sync */
2375 if (server->flags & NFS_MOUNT_NOAC)
2376 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2377
54ceac45 2378 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2379 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2380 if (IS_ERR(s)) {
2381 error = PTR_ERR(s);
2382 goto out_err_nosb;
2383 }
5006a76c 2384
54ceac45
DH		 2385 if (s->s_fs_info != server) {
2386 nfs_free_server(server);
2387 server = NULL;
fa799759
MS		 2388 } else {
2389 error = nfs_bdi_register(server);
2390 if (error)
cfbc0683 2391 goto error_splat_bdi;
f7b422b1 2392 }
24c8dbbb 2393
54ceac45
DH		 2394 if (!s->s_root) {
2395 /* initial superblock/root creation */
54ceac45 2396 nfs_clone_super(s, data->sb);
2df54806 2397 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2398 }
f7b422b1 2399
0d5839ad 2400 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2401 if (IS_ERR(mntroot)) {
2402 error = PTR_ERR(mntroot);
2403 goto error_splat_super;
f7b422b1 2404 }
e9cc6c23 2405 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2406 dput(mntroot);
2407 error = -ESTALE;
2408 goto error_splat_super;
2409 }
f7b422b1 2410
54ceac45 2411 s->s_flags |= MS_ACTIVE;
f7b422b1 2412
f9c3a380
EP		 2413 /* clone any lsm security options from the parent to the new sb */
2414 security_sb_clone_mnt_opts(data->sb, s);
2415
31f43471
AV		 2416 dprintk("<-- nfs_xdev_mount() = 0\n");
2417 return mntroot;
24c8dbbb 2418
54ceac45
DH		 2419out_err_nosb:
2420 nfs_free_server(server);
2421out_err_noserver:
31f43471
AV		 2422 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2423 return ERR_PTR(error);
f7b422b1 2424
54ceac45 2425error_splat_super:
cfbc0683
N		 2426 if (server && !s->s_root)
2427 bdi_unregister(&server->backing_dev_info);
2428error_splat_bdi:
6f5bbff9 2429 deactivate_locked_super(s);
31f43471
AV		 2430 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2431 return ERR_PTR(error);
f7b422b1
DH		 2432}
2433
54ceac45
DH		 2434#ifdef CONFIG_NFS_V4
2435
f7b422b1 2436/*
54ceac45 2437 * Finish setting up a cloned NFS4 superblock
f7b422b1 2438 */
54ceac45
DH		 2439static void nfs4_clone_super(struct super_block *sb,
2440 const struct super_block *old_sb)
f7b422b1 2441{
54ceac45
DH		 2442 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2443 sb->s_blocksize = old_sb->s_blocksize;
2444 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2445 sb->s_time_gran = 1;
54ceac45 2446 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2447 /*
2448 * The VFS shouldn't apply the umask to mode bits. We will do
2449 * so ourselves when necessary.
2450 */
2451 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2452 sb->s_xattr = old_sb->s_xattr;
2453 nfs_initialise_sb(sb);
f7b422b1
DH		 2454}
2455
54ceac45
DH		 2456/*
2457 * Set up an NFS4 superblock
2458 */
2459static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2460{
54ceac45
DH		 2461 sb->s_time_gran = 1;
2462 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2463 /*
2464 * The VFS shouldn't apply the umask to mode bits. We will do
2465 * so ourselves when necessary.
2466 */
2467 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2468 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2469 nfs_initialise_sb(sb);
f7b422b1
DH		 2470}
2471
01c3f052
TM		 2472static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2473{
5eebde23
SJ		 2474 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2475 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2476}
2477
7630c852
CL		 2478static int nfs4_validate_text_mount_data(void *options,
2479 struct nfs_parsed_mount_data *args,
2480 const char *dev_name)
2481{
2482 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2483
f5855fec 2484 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2485
2486 nfs_validate_transport_protocol(args);
2487
2488 nfs4_validate_mount_flags(args);
2489
2ecda72b
TM		 2490 if (args->version != 4) {
2491 dfprintk(MOUNT,
2492 "NFS4: Illegal mount version\n");
2493 return -EINVAL;
2494 }
2495
7630c852
CL		 2496 if (args->auth_flavor_len > 1) {
2497 dfprintk(MOUNT,
2498 "NFS4: Too many RPC auth flavours specified\n");
2499 return -EINVAL;
2500 }
2501
2502 if (args->client_address == NULL) {
2503 dfprintk(MOUNT,
2504 "NFS4: mount program didn't pass callback address\n");
2505 return -EINVAL;
2506 }
2507
2508 return nfs_parse_devname(dev_name,
2509 &args->nfs_server.hostname,
2510 NFS4_MAXNAMLEN,
2511 &args->nfs_server.export_path,
2512 NFS4_MAXPATHLEN);
2513}
2514
f0768ebd
CL		 2515/*
2516 * Validate NFSv4 mount options
2517 */
91ea40b9
TT		 2518static int nfs4_validate_mount_data(void *options,
2519 struct nfs_parsed_mount_data *args,
2520 const char *dev_name)
f0768ebd 2521{
4cfd74fc 2522 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2523 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2524 char *c;
2525
2526 if (data == NULL)
2527 goto out_no_data;
2528
2529 switch (data->version) {
2530 case 1:
4c568017
CL		 2531 if (data->host_addrlen > sizeof(args->nfs_server.address))
2532 goto out_no_address;
2533 if (data->host_addrlen == 0)
f0768ebd 2534 goto out_no_address;
4c568017 2535 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2536 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2537 return -EFAULT;
4cfd74fc 2538 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2539 goto out_no_address;
2540
6738b251
CL		 2541 if (data->auth_flavourlen) {
2542 if (data->auth_flavourlen > 1)
2543 goto out_inval_auth;
20c71f5e 2544 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2545 data->auth_flavours,
20c71f5e 2546 sizeof(args->auth_flavors[0])))
f0768ebd 2547 return -EFAULT;
f0768ebd
CL		 2548 }
2549
2550 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2551 if (IS_ERR(c))
2552 return PTR_ERR(c);
91ea40b9 2553 args->nfs_server.hostname = c;
f0768ebd
CL		 2554
2555 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2556 if (IS_ERR(c))
2557 return PTR_ERR(c);
91ea40b9
TT		 2558 args->nfs_server.export_path = c;
2559 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2560
2561 c = strndup_user(data->client_addr.data, 16);
2562 if (IS_ERR(c))
2563 return PTR_ERR(c);
91ea40b9
TT		 2564 args->client_address = c;
2565
2566 /*
2567 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2568 * can deal with.
2569 */
2570
2571 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2572 args->rsize = data->rsize;
2573 args->wsize = data->wsize;
2574 args->timeo = data->timeo;
2575 args->retrans = data->retrans;
2576 args->acregmin = data->acregmin;
2577 args->acregmax = data->acregmax;
2578 args->acdirmin = data->acdirmin;
2579 args->acdirmax = data->acdirmax;
2580 args->nfs_server.protocol = data->proto;
259875ef 2581 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2582
2583 break;
7630c852 2584 default:
91ea40b9 2585 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2586 return -EINVAL;
2587
4cfd74fc 2588 if (!nfs_verify_server_address(sap))
80071225 2589 return -EINVAL;
dc045898 2590
7630c852 2591 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2592 }
2593
2594 return 0;
2595
2596out_no_data:
2597 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2598 return -EINVAL;
2599
2600out_inval_auth:
2601 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2602 data->auth_flavourlen);
2603 return -EINVAL;
2604
2605out_no_address:
2606 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2607 return -EINVAL;
f0768ebd
CL		 2608}
2609
54ceac45 2610/*
c02d7adf 2611 * Get the superblock for the NFS4 root partition
54ceac45 2612 */
31f43471
AV		 2613static struct dentry *
2614nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2615 const char *dev_name, void *raw_data)
f7b422b1 2616{
c02d7adf 2617 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2618 struct super_block *s;
2619 struct nfs_server *server;
33852a1f 2620 struct nfs_fh *mntfh;
54ceac45 2621 struct dentry *mntroot;
75180df2 2622 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2623 struct nfs_sb_mountdata sb_mntdata = {
2624 .mntflags = flags,
2625 };
33852a1f
TM		 2626 int error = -ENOMEM;
2627
b157b06c 2628 mntfh = nfs_alloc_fhandle();
33852a1f 2629 if (data == NULL || mntfh == NULL)
8a0d551a 2630 goto out;
f9c3a380 2631
54ceac45 2632 /* Get a volume representation */
33852a1f 2633 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2634 if (IS_ERR(server)) {
2635 error = PTR_ERR(server);
29eb981a 2636 goto out;
f7b422b1 2637 }
e89a5a43 2638 sb_mntdata.server = server;
f7b422b1 2639
75180df2
TM		 2640 if (server->flags & NFS4_MOUNT_UNSHARED)
2641 compare_super = NULL;
2642
fb2088cc
SP		 2643 /* -o noac implies -o sync */
2644 if (server->flags & NFS_MOUNT_NOAC)
2645 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2646
54ceac45 2647 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2648 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2649 if (IS_ERR(s)) {
2650 error = PTR_ERR(s);
f7b422b1 2651 goto out_free;
816724e6
TM		 2652 }
2653
5dd3177a
TM		 2654 if (s->s_fs_info != server) {
2655 nfs_free_server(server);
2656 server = NULL;
fa799759
MS		 2657 } else {
2658 error = nfs_bdi_register(server);
2659 if (error)
cfbc0683 2660 goto error_splat_bdi;
5dd3177a
TM		 2661 }
2662
54ceac45
DH		 2663 if (!s->s_root) {
2664 /* initial superblock/root creation */
54ceac45 2665 nfs4_fill_super(s);
2df54806
DH		 2666 nfs_fscache_get_super_cookie(
2667 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2668 }
f7b422b1 2669
0d5839ad 2670 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2671 if (IS_ERR(mntroot)) {
2672 error = PTR_ERR(mntroot);
2673 goto error_splat_super;
f7b422b1 2674 }
54ceac45 2675
33852a1f 2676 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2677 if (error)
2678 goto error_splat_root;
2679
f7b422b1 2680 s->s_flags |= MS_ACTIVE;
31f43471 2681
31f43471
AV		 2682 nfs_free_fhandle(mntfh);
2683 return mntroot;
29eb981a
CL		 2684
2685out:
b157b06c 2686 nfs_free_fhandle(mntfh);
31f43471 2687 return ERR_PTR(error);
54ceac45 2688
f7b422b1 2689out_free:
54ceac45 2690 nfs_free_server(server);
29eb981a 2691 goto out;
54ceac45 2692
46c8ac74
EP		 2693error_splat_root:
2694 dput(mntroot);
54ceac45 2695error_splat_super:
cfbc0683
N		 2696 if (server && !s->s_root)
2697 bdi_unregister(&server->backing_dev_info);
2698error_splat_bdi:
6f5bbff9 2699 deactivate_locked_super(s);
29eb981a 2700 goto out;
f7b422b1
DH		 2701}
2702
c02d7adf
TM		 2703static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2704 int flags, void *data, const char *hostname)
2705{
2706 struct vfsmount *root_mnt;
2707 char *root_devname;
2708 size_t len;
2709
2710 len = strlen(hostname) + 3;
2711 root_devname = kmalloc(len, GFP_KERNEL);
2712 if (root_devname == NULL)
2713 return ERR_PTR(-ENOMEM);
2714 snprintf(root_devname, len, "%s:/", hostname);
2715 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2716 kfree(root_devname);
2717 return root_mnt;
2718}
2719
ce587e07
TM		 2720struct nfs_referral_count {
2721 struct list_head list;
2722 const struct task_struct *task;
2723 unsigned int referral_count;
2724};
2725
2726static LIST_HEAD(nfs_referral_count_list);
2727static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2728
2729static struct nfs_referral_count *nfs_find_referral_count(void)
2730{
2731 struct nfs_referral_count *p;
2732
2733 list_for_each_entry(p, &nfs_referral_count_list, list) {
2734 if (p->task == current)
2735 return p;
2736 }
2737 return NULL;
2738}
2739
2740#define NFS_MAX_NESTED_REFERRALS 2
2741
2742static int nfs_referral_loop_protect(void)
2743{
2744 struct nfs_referral_count *p, *new;
2745 int ret = -ENOMEM;
2746
2747 new = kmalloc(sizeof(*new), GFP_KERNEL);
2748 if (!new)
2749 goto out;
2750 new->task = current;
2751 new->referral_count = 1;
2752
2753 ret = 0;
2754 spin_lock(&nfs_referral_count_list_lock);
2755 p = nfs_find_referral_count();
2756 if (p != NULL) {
2757 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2758 ret = -ELOOP;
2759 else
2760 p->referral_count++;
2761 } else {
2762 list_add(&new->list, &nfs_referral_count_list);
2763 new = NULL;
2764 }
2765 spin_unlock(&nfs_referral_count_list_lock);
2766 kfree(new);
2767out:
2768 return ret;
2769}
2770
2771static void nfs_referral_loop_unprotect(void)
2772{
2773 struct nfs_referral_count *p;
2774
2775 spin_lock(&nfs_referral_count_list_lock);
2776 p = nfs_find_referral_count();
2777 p->referral_count--;
2778 if (p->referral_count == 0)
2779 list_del(&p->list);
2780 else
2781 p = NULL;
2782 spin_unlock(&nfs_referral_count_list_lock);
2783 kfree(p);
2784}
2785
01194981
AV		 2786static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2787 const char *export_path)
c02d7adf 2788{
01194981 2789 struct dentry *dentry;
5352d3b6 2790 int err;
c02d7adf 2791
5352d3b6
AV		 2792 if (IS_ERR(root_mnt))
2793 return ERR_CAST(root_mnt);
2794
2795 err = nfs_referral_loop_protect();
2796 if (err) {
ea441d11 2797 mntput(root_mnt);
5352d3b6 2798 return ERR_PTR(err);
ea441d11 2799 }
c02d7adf 2800
ea441d11
AV		 2801 dentry = mount_subtree(root_mnt, export_path);
2802 nfs_referral_loop_unprotect();
c02d7adf 2803
01194981 2804 return dentry;
c02d7adf
TM		 2805}
2806
01194981
AV		 2807static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2808 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2809{
2810 char *export_path;
2811 struct vfsmount *root_mnt;
01194981 2812 struct dentry *res;
a6fe23be
CL		 2813
2814 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2815
2816 export_path = data->nfs_server.export_path;
2817 data->nfs_server.export_path = "/";
2818 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2819 data->nfs_server.hostname);
2820 data->nfs_server.export_path = export_path;
2821
5352d3b6 2822 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2823
01194981
AV		 2824 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2825 IS_ERR(res) ? PTR_ERR(res) : 0,
2826 IS_ERR(res) ? " [error]" : "");
2827 return res;
a6fe23be
CL		 2828}
2829
c02d7adf
TM		 2830/*
2831 * Get the superblock for an NFS4 mountpoint
2832 */
01194981
AV		 2833static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2834 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2835{
2836 struct nfs_parsed_mount_data *data;
c02d7adf 2837 int error = -ENOMEM;
01194981 2838 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2839
c5811dbd 2840 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2841 if (data == NULL)
8a0d551a 2842 goto out;
c02d7adf
TM		 2843
2844 /* Validate the mount data */
2845 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2846 if (error < 0) {
2847 res = ERR_PTR(error);
c02d7adf 2848 goto out;
01194981 2849 }
c02d7adf 2850
01194981
AV		 2851 res = nfs4_try_mount(flags, dev_name, data);
2852 if (IS_ERR(res))
2853 error = PTR_ERR(res);
c02d7adf
TM		 2854
2855out:
8a0d551a 2856 nfs_free_parsed_mount_data(data);
01194981 2857 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2858 error != 0 ? " [error]" : "");
01194981 2859 return res;
c02d7adf
TM		 2860}
2861
f7b422b1
DH		 2862static void nfs4_kill_super(struct super_block *sb)
2863{
2864 struct nfs_server *server = NFS_SB(sb);
2865
0f3e66c6 2866 dprintk("--> %s\n", __func__);
515d8611 2867 nfs_super_return_all_delegations(sb);
f7b422b1 2868 kill_anon_super(sb);
08734048 2869 nfs_fscache_release_super_cookie(sb);
54ceac45 2870 nfs_free_server(server);
0f3e66c6 2871 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2872}
2873
2874/*
54ceac45 2875 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2876 */
31f43471
AV		 2877static struct dentry *
2878nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2879 const char *dev_name, void *raw_data)
f7b422b1 2880{
54ceac45
DH		 2881 struct nfs_clone_mount *data = raw_data;
2882 struct super_block *s;
2883 struct nfs_server *server;
2884 struct dentry *mntroot;
75180df2 2885 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2886 struct nfs_sb_mountdata sb_mntdata = {
2887 .mntflags = flags,
2888 };
54ceac45 2889 int error;
f7b422b1 2890
31f43471 2891 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2892
54ceac45
DH		 2893 /* create a new volume representation */
2894 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2895 if (IS_ERR(server)) {
2896 error = PTR_ERR(server);
2897 goto out_err_noserver;
f7b422b1 2898 }
e89a5a43 2899 sb_mntdata.server = server;
f7b422b1 2900
75180df2
TM		 2901 if (server->flags & NFS4_MOUNT_UNSHARED)
2902 compare_super = NULL;
2903
fb2088cc
SP		 2904 /* -o noac implies -o sync */
2905 if (server->flags & NFS_MOUNT_NOAC)
2906 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2907
54ceac45 2908 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2909 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2910 if (IS_ERR(s)) {
2911 error = PTR_ERR(s);
2912 goto out_err_nosb;
f7b422b1 2913 }
f7b422b1 2914
54ceac45
DH		 2915 if (s->s_fs_info != server) {
2916 nfs_free_server(server);
2917 server = NULL;
fa799759
MS		 2918 } else {
2919 error = nfs_bdi_register(server);
2920 if (error)
cfbc0683 2921 goto error_splat_bdi;
54ceac45 2922 }
f7b422b1 2923
54ceac45
DH		 2924 if (!s->s_root) {
2925 /* initial superblock/root creation */
54ceac45 2926 nfs4_clone_super(s, data->sb);
2df54806 2927 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2928 }
f7b422b1 2929
0d5839ad 2930 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 2931 if (IS_ERR(mntroot)) {
2932 error = PTR_ERR(mntroot);
2933 goto error_splat_super;
2934 }
e9cc6c23
TM		 2935 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2936 dput(mntroot);
2937 error = -ESTALE;
2938 goto error_splat_super;
2939 }
f7b422b1 2940
54ceac45 2941 s->s_flags |= MS_ACTIVE;
54ceac45 2942
46c8ac74
EP		 2943 security_sb_clone_mnt_opts(data->sb, s);
2944
31f43471
AV		 2945 dprintk("<-- nfs4_xdev_mount() = 0\n");
2946 return mntroot;
54ceac45
DH		 2947
2948out_err_nosb:
2949 nfs_free_server(server);
2950out_err_noserver:
31f43471
AV		 2951 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2952 return ERR_PTR(error);
54ceac45
DH		 2953
2954error_splat_super:
cfbc0683
N		 2955 if (server && !s->s_root)
2956 bdi_unregister(&server->backing_dev_info);
2957error_splat_bdi:
6f5bbff9 2958 deactivate_locked_super(s);
31f43471
AV		 2959 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2960 return ERR_PTR(error);
f7b422b1
DH		 2961}
2962
31f43471
AV		 2963static struct dentry *
2964nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2965 const char *dev_name, void *raw_data)
f7b422b1
DH		 2966{
2967 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2968 struct super_block *s;
2969 struct nfs_server *server;
2970 struct dentry *mntroot;
4f727296 2971 struct nfs_fh *mntfh;
75180df2 2972 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2973 struct nfs_sb_mountdata sb_mntdata = {
2974 .mntflags = flags,
2975 };
4f727296 2976 int error = -ENOMEM;
54ceac45
DH		 2977
2978 dprintk("--> nfs4_referral_get_sb()\n");
2979
4f727296
TM		 2980 mntfh = nfs_alloc_fhandle();
2981 if (mntfh == NULL)
2982 goto out_err_nofh;
2983
54ceac45 2984 /* create a new volume representation */
4f727296 2985 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 2986 if (IS_ERR(server)) {
2987 error = PTR_ERR(server);
2988 goto out_err_noserver;
2989 }
e89a5a43 2990 sb_mntdata.server = server;
54ceac45 2991
75180df2
TM		 2992 if (server->flags & NFS4_MOUNT_UNSHARED)
2993 compare_super = NULL;
2994
fb2088cc
SP		 2995 /* -o noac implies -o sync */
2996 if (server->flags & NFS_MOUNT_NOAC)
2997 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2998
54ceac45 2999 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3000 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3001 if (IS_ERR(s)) {
3002 error = PTR_ERR(s);
3003 goto out_err_nosb;
3004 }
3005
3006 if (s->s_fs_info != server) {
3007 nfs_free_server(server);
3008 server = NULL;
fa799759
MS		 3009 } else {
3010 error = nfs_bdi_register(server);
3011 if (error)
cfbc0683 3012 goto error_splat_bdi;
54ceac45
DH		 3013 }
3014
3015 if (!s->s_root) {
3016 /* initial superblock/root creation */
54ceac45 3017 nfs4_fill_super(s);
2df54806 3018 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3019 }
3020
0d5839ad 3021 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3022 if (IS_ERR(mntroot)) {
3023 error = PTR_ERR(mntroot);
3024 goto error_splat_super;
3025 }
e9cc6c23
TM		 3026 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3027 dput(mntroot);
3028 error = -ESTALE;
3029 goto error_splat_super;
3030 }
54ceac45
DH		 3031
3032 s->s_flags |= MS_ACTIVE;
54ceac45 3033
46c8ac74
EP		 3034 security_sb_clone_mnt_opts(data->sb, s);
3035
4f727296 3036 nfs_free_fhandle(mntfh);
54ceac45 3037 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3038 return mntroot;
54ceac45
DH		 3039
3040out_err_nosb:
3041 nfs_free_server(server);
3042out_err_noserver:
4f727296
TM		 3043 nfs_free_fhandle(mntfh);
3044out_err_nofh:
54ceac45 3045 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3046 return ERR_PTR(error);
54ceac45
DH		 3047
3048error_splat_super:
cfbc0683
N		 3049 if (server && !s->s_root)
3050 bdi_unregister(&server->backing_dev_info);
3051error_splat_bdi:
6f5bbff9 3052 deactivate_locked_super(s);
4f727296 3053 nfs_free_fhandle(mntfh);
54ceac45 3054 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3055 return ERR_PTR(error);
f7b422b1
DH		 3056}
3057
c02d7adf
TM		 3058/*
3059 * Create an NFS4 server record on referral traversal
3060 */
01194981
AV		 3061static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3062 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3063{
3064 struct nfs_clone_mount *data = raw_data;
3065 char *export_path;
3066 struct vfsmount *root_mnt;
01194981 3067 struct dentry *res;
c02d7adf 3068
01194981 3069 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3070
3071 export_path = data->mnt_path;
3072 data->mnt_path = "/";
3073
3074 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3075 flags, data, data->hostname);
3076 data->mnt_path = export_path;
3077
5352d3b6 3078 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3079 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3080 IS_ERR(res) ? PTR_ERR(res) : 0,
3081 IS_ERR(res) ? " [error]" : "");
3082 return res;
c02d7adf
TM		 3083}
3084
54ceac45 3085#endif /* CONFIG_NFS_V4 */
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