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NFS: Allocate parsed mount data directly to the nfs_mount_info structure
[mirror_ubuntu-bionic-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
2446ab60 56#include <linux/rcupdate.h>
f7b422b1 57
f7b422b1
DH		 58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 69#define NFS_TEXT_DATA 1
f7b422b1 70
1e657bd5
PZ		 71#ifdef CONFIG_NFS_V3
72#define NFS_DEFAULT_VERSION 3
73#else
74#define NFS_DEFAULT_VERSION 2
75#endif
76
bf0fd768
CL		 77enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
bf0fd768
CL		 80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
2cf7ff7a 84 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
75180df2 87 Opt_sharecache, Opt_nosharecache,
d740351b 88 Opt_resvport, Opt_noresvport,
b797cac7 89 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
e887cbcf 100 Opt_mountvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
0d71b058 104 Opt_nfsvers,
33832034 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 107 Opt_lookupcache,
b797cac7 108 Opt_fscache_uniq,
5eebde23 109 Opt_local_lock,
bf0fd768 110
f45663ce
CL		 111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 113
114 Opt_err
115};
116
a447c093 117static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
ecbb3845
CL		 120 { Opt_userspace, "retry=%s" },
121
f45663ce
CL		 122 { Opt_sloppy, "sloppy" },
123
bf0fd768
CL		 124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
d33e4dfe
CL		 126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
bf0fd768
CL		 128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
bf0fd768
CL		 136 { Opt_udp, "udp" },
137 { Opt_tcp, "tcp" },
2cf7ff7a 138 { Opt_rdma, "rdma" },
bf0fd768
CL		 139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
b797cac7 147 { Opt_fscache, "fsc" },
b797cac7 148 { Opt_nofscache, "nofsc" },
bf0fd768 149
a5a16bae
CL		 150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 164 { Opt_minorversion, "minorversion=%s" },
165
a5a16bae
CL		 166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
33832034 174 { Opt_mounthost, "mounthost=%s" },
0ac83779 175 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 176
7973c1f1 177 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 178 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 179 { Opt_local_lock, "local_lock=%s" },
7973c1f1 180
3862279a
TM		 181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
bf0fd768
CL		 184 { Opt_err, NULL }
185};
186
187enum {
ee671b01 188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 189
190 Opt_xprt_err
191};
192
a447c093 193static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 194 { Opt_xprt_udp, "udp" },
ee671b01 195 { Opt_xprt_udp6, "udp6" },
bf0fd768 196 { Opt_xprt_tcp, "tcp" },
ee671b01 197 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 198 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 199
200 { Opt_xprt_err, NULL }
201};
202
203enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210};
211
a447c093 212static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
8d042218
OK		 225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
bf0fd768
CL		 229 { Opt_sec_err, NULL }
230};
231
7973c1f1
TM		 232enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237};
238
239static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246};
247
5eebde23
SJ		 248enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253};
254
255static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262};
263
0d71b058
TM		 264enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269};
270
271static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279};
bf0fd768 280
c40f8d1d
BS		 281struct nfs_mount_info {
282 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
3d176e3f 283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
c40f8d1d 284 struct nfs_parsed_mount_data *parsed;
8c958e0c 285 struct nfs_clone_mount *cloned;
c40f8d1d
BS		 286};
287
42faad99 288static void nfs_umount_begin(struct super_block *);
816724e6 289static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 290static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 291static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 292static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 293static int nfs_show_stats(struct seq_file *, struct dentry *);
486aa699
BS		 294static struct dentry *nfs_fs_mount_common(struct file_system_type *,
295 struct nfs_server *, int, const char *, struct nfs_fh *,
296 struct nfs_mount_info *);
01194981
AV		 297static struct dentry *nfs_fs_mount(struct file_system_type *,
298 int, const char *, void *);
31f43471
AV		 299static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
300 int flags, const char *dev_name, void *raw_data);
387c149b 301static void nfs_put_super(struct super_block *);
f7b422b1 302static void nfs_kill_super(struct super_block *);
48b605f8 303static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 304
305static struct file_system_type nfs_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs",
01194981 308 .mount = nfs_fs_mount,
f7b422b1 309 .kill_sb = nfs_kill_super,
349457cc 310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 311};
312
54ceac45 313struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 314 .owner = THIS_MODULE,
315 .name = "nfs",
31f43471 316 .mount = nfs_xdev_mount,
f7b422b1 317 .kill_sb = nfs_kill_super,
349457cc 318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 319};
320
ee9b6d61 321static const struct super_operations nfs_sops = {
f7b422b1
DH		 322 .alloc_inode = nfs_alloc_inode,
323 .destroy_inode = nfs_destroy_inode,
324 .write_inode = nfs_write_inode,
387c149b 325 .put_super = nfs_put_super,
f7b422b1 326 .statfs = nfs_statfs,
b57922d9 327 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 328 .umount_begin = nfs_umount_begin,
329 .show_options = nfs_show_options,
c7f404b4
AV		 330 .show_devname = nfs_show_devname,
331 .show_path = nfs_show_path,
f7b422b1 332 .show_stats = nfs_show_stats,
48b605f8 333 .remount_fs = nfs_remount,
f7b422b1
DH		 334};
335
336#ifdef CONFIG_NFS_V4
b72e4f42 337static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 338static int nfs4_validate_mount_data(void *options,
339 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 340static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
341 struct nfs_parsed_mount_data *data);
342static struct dentry *nfs4_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 344static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
346static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
01194981
AV		 348static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 350static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
351 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 352static void nfs4_kill_super(struct super_block *sb);
353
354static struct file_system_type nfs4_fs_type = {
355 .owner = THIS_MODULE,
356 .name = "nfs4",
01194981 357 .mount = nfs4_mount,
f7b422b1 358 .kill_sb = nfs4_kill_super,
349457cc 359 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 360};
361
c02d7adf
TM		 362static struct file_system_type nfs4_remote_fs_type = {
363 .owner = THIS_MODULE,
364 .name = "nfs4",
31f43471 365 .mount = nfs4_remote_mount,
c02d7adf
TM		 366 .kill_sb = nfs4_kill_super,
367 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
368};
369
54ceac45 370struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 371 .owner = THIS_MODULE,
372 .name = "nfs4",
31f43471 373 .mount = nfs4_xdev_mount,
f7b422b1 374 .kill_sb = nfs4_kill_super,
349457cc 375 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 376};
377
c02d7adf
TM		 378static struct file_system_type nfs4_remote_referral_fs_type = {
379 .owner = THIS_MODULE,
380 .name = "nfs4",
31f43471 381 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 382 .kill_sb = nfs4_kill_super,
383 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
384};
385
54ceac45 386struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 387 .owner = THIS_MODULE,
388 .name = "nfs4",
01194981 389 .mount = nfs4_referral_mount,
f7b422b1 390 .kill_sb = nfs4_kill_super,
349457cc 391 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 392};
393
ee9b6d61 394static const struct super_operations nfs4_sops = {
f7b422b1
DH		 395 .alloc_inode = nfs_alloc_inode,
396 .destroy_inode = nfs_destroy_inode,
397 .write_inode = nfs_write_inode,
387c149b 398 .put_super = nfs_put_super,
f7b422b1 399 .statfs = nfs_statfs,
b57922d9 400 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 401 .umount_begin = nfs_umount_begin,
402 .show_options = nfs_show_options,
c7f404b4
AV		 403 .show_devname = nfs_show_devname,
404 .show_path = nfs_show_path,
f7b422b1 405 .show_stats = nfs_show_stats,
48b605f8 406 .remount_fs = nfs_remount,
f7b422b1
DH		 407};
408#endif
409
8e1f936b
RR		 410static struct shrinker acl_shrinker = {
411 .shrink = nfs_access_cache_shrinker,
412 .seeks = DEFAULT_SEEKS,
413};
979df72e 414
f7b422b1
DH		 415/*
416 * Register the NFS filesystems
417 */
418int __init register_nfs_fs(void)
419{
420 int ret;
421
422 ret = register_filesystem(&nfs_fs_type);
423 if (ret < 0)
424 goto error_0;
425
f7b422b1
DH		 426 ret = nfs_register_sysctl();
427 if (ret < 0)
428 goto error_1;
89a09141 429#ifdef CONFIG_NFS_V4
f7b422b1
DH		 430 ret = register_filesystem(&nfs4_fs_type);
431 if (ret < 0)
432 goto error_2;
433#endif
8e1f936b 434 register_shrinker(&acl_shrinker);
f7b422b1
DH		 435 return 0;
436
437#ifdef CONFIG_NFS_V4
438error_2:
439 nfs_unregister_sysctl();
89a09141 440#endif
f7b422b1
DH		 441error_1:
442 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 443error_0:
444 return ret;
445}
446
447/*
448 * Unregister the NFS filesystems
449 */
450void __exit unregister_nfs_fs(void)
451{
8e1f936b 452 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 453#ifdef CONFIG_NFS_V4
454 unregister_filesystem(&nfs4_fs_type);
f7b422b1 455#endif
49af7ee1 456 nfs_unregister_sysctl();
f7b422b1
DH		 457 unregister_filesystem(&nfs_fs_type);
458}
459
1daef0a8 460void nfs_sb_active(struct super_block *sb)
ef818a28 461{
1daef0a8 462 struct nfs_server *server = NFS_SB(sb);
ef818a28 463
1daef0a8
TM		 464 if (atomic_inc_return(&server->active) == 1)
465 atomic_inc(&sb->s_active);
ef818a28
SD		 466}
467
1daef0a8 468void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 469{
470 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 471
472 if (atomic_dec_and_test(&server->active))
473 deactivate_super(sb);
ef818a28
SD		 474}
475
f7b422b1
DH		 476/*
477 * Deliver file system statistics to userspace
478 */
816724e6 479static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 480{
0c7d90cf 481 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 482 unsigned char blockbits;
483 unsigned long blockres;
0c7d90cf 484 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 485 struct nfs_fsstat res;
486 int error = -ENOMEM;
487
488 res.fattr = nfs_alloc_fattr();
489 if (res.fattr == NULL)
490 goto out_err;
f7b422b1 491
8fa5c000 492 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 493 if (unlikely(error == -ESTALE)) {
494 struct dentry *pd_dentry;
495
496 pd_dentry = dget_parent(dentry);
497 if (pd_dentry != NULL) {
498 nfs_zap_caches(pd_dentry->d_inode);
499 dput(pd_dentry);
500 }
501 }
ca7e9a0d 502 nfs_free_fattr(res.fattr);
f7b422b1
DH		 503 if (error < 0)
504 goto out_err;
ca7e9a0d 505
1a0ba9ae 506 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 507
508 /*
509 * Current versions of glibc do not correctly handle the
510 * case where f_frsize != f_bsize. Eventually we want to
511 * report the value of wtmult in this field.
512 */
0c7d90cf 513 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 514
515 /*
516 * On most *nix systems, f_blocks, f_bfree, and f_bavail
517 * are reported in units of f_frsize. Linux hasn't had
518 * an f_frsize field in its statfs struct until recently,
519 * thus historically Linux's sys_statfs reports these
520 * fields in units of f_bsize.
521 */
0c7d90cf
DH		 522 buf->f_bsize = dentry->d_sb->s_blocksize;
523 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 524 blockres = (1 << blockbits) - 1;
525 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
526 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
527 buf->f_bavail = (res.abytes + blockres) >> blockbits;
528
529 buf->f_files = res.tfiles;
530 buf->f_ffree = res.afiles;
531
532 buf->f_namelen = server->namelen;
1a0ba9ae 533
f7b422b1
DH		 534 return 0;
535
536 out_err:
3110ff80 537 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 538 return error;
f7b422b1
DH		 539}
540
7d4e2747
DH		 541/*
542 * Map the security flavour number to a name
543 */
81039f1f
TM		 544static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
545{
7d4e2747 546 static const struct {
81039f1f
TM		 547 rpc_authflavor_t flavour;
548 const char *str;
549 } sec_flavours[] = {
550 { RPC_AUTH_NULL, "null" },
551 { RPC_AUTH_UNIX, "sys" },
552 { RPC_AUTH_GSS_KRB5, "krb5" },
553 { RPC_AUTH_GSS_KRB5I, "krb5i" },
554 { RPC_AUTH_GSS_KRB5P, "krb5p" },
555 { RPC_AUTH_GSS_LKEY, "lkey" },
556 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
557 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
558 { RPC_AUTH_GSS_SPKM, "spkm" },
559 { RPC_AUTH_GSS_SPKMI, "spkmi" },
560 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 561 { UINT_MAX, "unknown" }
81039f1f
TM		 562 };
563 int i;
564
4d81cd16 565 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 566 if (sec_flavours[i].flavour == flavour)
567 break;
568 }
569 return sec_flavours[i].str;
570}
571
ee671b01
JL		 572static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
573 int showdefaults)
574{
575 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
576
577 seq_printf(m, ",mountproto=");
578 switch (sap->sa_family) {
579 case AF_INET:
580 switch (nfss->mountd_protocol) {
581 case IPPROTO_UDP:
582 seq_printf(m, RPCBIND_NETID_UDP);
583 break;
584 case IPPROTO_TCP:
585 seq_printf(m, RPCBIND_NETID_TCP);
586 break;
587 default:
588 if (showdefaults)
589 seq_printf(m, "auto");
590 }
591 break;
592 case AF_INET6:
593 switch (nfss->mountd_protocol) {
594 case IPPROTO_UDP:
595 seq_printf(m, RPCBIND_NETID_UDP6);
596 break;
597 case IPPROTO_TCP:
598 seq_printf(m, RPCBIND_NETID_TCP6);
599 break;
600 default:
601 if (showdefaults)
602 seq_printf(m, "auto");
603 }
604 break;
605 default:
606 if (showdefaults)
607 seq_printf(m, "auto");
608 }
609}
610
82d101d5
CL		 611static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
612 int showdefaults)
613{
614 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
615
d5eff1a3
BS		 616 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
617 return;
618
82d101d5
CL		 619 switch (sap->sa_family) {
620 case AF_INET: {
621 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 622 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 623 break;
624 }
625 case AF_INET6: {
626 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 627 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 628 break;
629 }
630 default:
631 if (showdefaults)
632 seq_printf(m, ",mountaddr=unspecified");
633 }
634
635 if (nfss->mountd_version || showdefaults)
636 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 637 if ((nfss->mountd_port &&
638 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
639 showdefaults)
82d101d5
CL		 640 seq_printf(m, ",mountport=%u", nfss->mountd_port);
641
ee671b01 642 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 643}
644
0be8189f
TM		 645#ifdef CONFIG_NFS_V4
646static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
647 int showdefaults)
648{
649 struct nfs_client *clp = nfss->nfs_client;
650
651 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 652}
653#else
654static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
655 int showdefaults)
656{
657}
658#endif
659
7bbceb6f
TM		 660static void nfs_show_nfs_version(struct seq_file *m,
661 unsigned int version,
662 unsigned int minorversion)
663{
664 seq_printf(m, ",vers=%u", version);
665 if (version == 4)
666 seq_printf(m, ".%u", minorversion);
667}
668
f7b422b1
DH		 669/*
670 * Describe the mount options in force on this server representation
671 */
82d101d5
CL		 672static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
673 int showdefaults)
f7b422b1 674{
509de811 675 static const struct proc_nfs_info {
f7b422b1 676 int flag;
509de811
DH		 677 const char *str;
678 const char *nostr;
f7b422b1
DH		 679 } nfs_info[] = {
680 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 681 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 682 { NFS_MOUNT_NOCTO, ",nocto", "" },
683 { NFS_MOUNT_NOAC, ",noac", "" },
684 { NFS_MOUNT_NONLM, ",nolock", "" },
685 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 686 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 687 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
688 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 689 { 0, NULL, NULL }
690 };
509de811 691 const struct proc_nfs_info *nfs_infop;
8fa5c000 692 struct nfs_client *clp = nfss->nfs_client;
82d101d5 693 u32 version = clp->rpc_ops->version;
7c563cc9 694 int local_flock, local_fcntl;
f7b422b1 695
7bbceb6f 696 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 697 seq_printf(m, ",rsize=%u", nfss->rsize);
698 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 699 if (nfss->bsize != 0)
700 seq_printf(m, ",bsize=%u", nfss->bsize);
701 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 702 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 703 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 704 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 705 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 706 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 707 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 708 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 709 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 710 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
711 if (nfss->flags & nfs_infop->flag)
712 seq_puts(m, nfs_infop->str);
713 else
714 seq_puts(m, nfs_infop->nostr);
715 }
2446ab60 716 rcu_read_lock();
56928edd 717 seq_printf(m, ",proto=%s",
ee671b01 718 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 719 rcu_read_unlock();
82d101d5
CL		 720 if (version == 4) {
721 if (nfss->port != NFS_PORT)
722 seq_printf(m, ",port=%u", nfss->port);
723 } else
724 if (nfss->port)
725 seq_printf(m, ",port=%u", nfss->port);
726
33170233
TM		 727 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
728 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 729 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 730
731 if (version != 4)
732 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 733 else
734 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 735
b797cac7
DH		 736 if (nfss->options & NFS_OPTION_FSCACHE)
737 seq_printf(m, ",fsc");
9b00c643
PL		 738
739 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
740 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
741 seq_printf(m, ",lookupcache=none");
742 else
743 seq_printf(m, ",lookupcache=pos");
744 }
7c563cc9
SJ		 745
746 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
747 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
748
749 if (!local_flock && !local_fcntl)
750 seq_printf(m, ",local_lock=none");
751 else if (local_flock && local_fcntl)
752 seq_printf(m, ",local_lock=all");
753 else if (local_flock)
754 seq_printf(m, ",local_lock=flock");
755 else
756 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 757}
758
759/*
760 * Describe the mount options on this VFS mountpoint
761 */
34c80b1d 762static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 763{
34c80b1d 764 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 765
766 nfs_show_mount_options(m, nfss, 0);
767
2446ab60 768 rcu_read_lock();
5d8515ca
CL		 769 seq_printf(m, ",addr=%s",
770 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
771 RPC_DISPLAY_ADDR));
2446ab60 772 rcu_read_unlock();
f7b422b1
DH		 773
774 return 0;
775}
45402c38
HS		 776
777#ifdef CONFIG_NFS_V4
ae50c0b5 778#ifdef CONFIG_NFS_V4_1
45402c38 779static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 780{
781 if (nfs4_has_session(server->nfs_client))
782 seq_printf(m, ",sessions");
783}
784#else
45402c38
HS		 785static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
786#endif
ae50c0b5
BF		 787#endif
788
789#ifdef CONFIG_NFS_V4_1
45402c38 790static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 791{
792 seq_printf(m, ",pnfs=");
793 if (server->pnfs_curr_ld)
794 seq_printf(m, "%s", server->pnfs_curr_ld->name);
795 else
796 seq_printf(m, "not configured");
797}
7e03b7cc
TM		 798
799static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
800{
801 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
802 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
803 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
804 "date='%llu,%u'",
805 impl_id->name, impl_id->domain,
806 impl_id->date.seconds, impl_id->date.nseconds);
807 }
808}
45402c38 809#else
7e03b7cc
TM		 810#ifdef CONFIG_NFS_V4
811static void show_pnfs(struct seq_file *m, struct nfs_server *server)
812{
813}
45402c38 814#endif
7e03b7cc
TM		 815static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
816{
817}
45402c38 818#endif
f7b422b1 819
d861c630 820static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 821{
822 char *page = (char *) __get_free_page(GFP_KERNEL);
823 char *devname, *dummy;
824 int err = 0;
825 if (!page)
826 return -ENOMEM;
d861c630 827 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 828 if (IS_ERR(devname))
829 err = PTR_ERR(devname);
830 else
831 seq_escape(m, devname, " \t\n\\");
832 free_page((unsigned long)page);
833 return err;
834}
835
a6322de6 836static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 837{
838 seq_puts(m, "/");
839 return 0;
840}
841
f7b422b1
DH		 842/*
843 * Present statistical information for this VFS mountpoint
844 */
64132379 845static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 846{
847 int i, cpu;
64132379 848 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 849 struct rpc_auth *auth = nfss->client->cl_auth;
850 struct nfs_iostats totals = { };
851
852 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
853
854 /*
855 * Display all mount option settings
856 */
857 seq_printf(m, "\n\topts:\t");
64132379
AV		 858 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
859 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
860 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
861 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 862 nfs_show_mount_options(m, nfss, 1);
863
864 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
865
7e03b7cc 866 show_implementation_id(m, nfss);
7d2ed9ac 867
f7b422b1
DH		 868 seq_printf(m, "\n\tcaps:\t");
869 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 870 seq_printf(m, ",wtmult=%u", nfss->wtmult);
871 seq_printf(m, ",dtsize=%u", nfss->dtsize);
872 seq_printf(m, ",bsize=%u", nfss->bsize);
873 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 874
875#ifdef CONFIG_NFS_V4
40c55319 876 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 877 seq_printf(m, "\n\tnfsv4:\t");
878 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
879 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
880 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 881 show_sessions(m, nfss);
882 show_pnfs(m, nfss);
f7b422b1
DH		 883 }
884#endif
885
886 /*
887 * Display security flavor in effect for this mount
888 */
2d767432 889 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 890 if (auth->au_flavor)
2d767432 891 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 892
893 /*
894 * Display superblock I/O counters
895 */
896 for_each_possible_cpu(cpu) {
897 struct nfs_iostats *stats;
898
899 preempt_disable();
900 stats = per_cpu_ptr(nfss->io_stats, cpu);
901
902 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
903 totals.events[i] += stats->events[i];
904 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
905 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 906#ifdef CONFIG_NFS_FSCACHE
907 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
908 totals.fscache[i] += stats->fscache[i];
909#endif
f7b422b1
DH		 910
911 preempt_enable();
912 }
913
914 seq_printf(m, "\n\tevents:\t");
915 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
916 seq_printf(m, "%lu ", totals.events[i]);
917 seq_printf(m, "\n\tbytes:\t");
918 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
919 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 920#ifdef CONFIG_NFS_FSCACHE
921 if (nfss->options & NFS_OPTION_FSCACHE) {
922 seq_printf(m, "\n\tfsc:\t");
923 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
924 seq_printf(m, "%Lu ", totals.bytes[i]);
925 }
926#endif
f7b422b1
DH		 927 seq_printf(m, "\n");
928
929 rpc_print_iostats(m, nfss->client);
930
931 return 0;
932}
933
934/*
935 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 936 * in response to xdev traversals and referrals
f7b422b1 937 */
42faad99 938static void nfs_umount_begin(struct super_block *sb)
f7b422b1 939{
67e55205 940 struct nfs_server *server;
fc6ae3cf
TM		 941 struct rpc_clnt *rpc;
942
67e55205 943 server = NFS_SB(sb);
fc6ae3cf
TM		 944 /* -EIO all pending I/O */
945 rpc = server->client_acl;
946 if (!IS_ERR(rpc))
947 rpc_killall_tasks(rpc);
948 rpc = server->client;
949 if (!IS_ERR(rpc))
950 rpc_killall_tasks(rpc);
f7b422b1
DH		 951}
952
db833351 953static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 954{
955 struct nfs_parsed_mount_data *data;
956
957 data = kzalloc(sizeof(*data), GFP_KERNEL);
958 if (data) {
9423a08a
CL		 959 data->acregmin = NFS_DEF_ACREGMIN;
960 data->acregmax = NFS_DEF_ACREGMAX;
961 data->acdirmin = NFS_DEF_ACDIRMIN;
962 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 963 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 964 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 965 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 966 data->auth_flavors[0] = RPC_AUTH_UNIX;
967 data->auth_flavor_len = 1;
968 data->minorversion = 0;
b72e4f42 969 data->need_mount = true;
9937347a 970 data->net = current->nsproxy->net_ns;
8a0d551a 971 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 972 }
973 return data;
974}
975
8a0d551a
JL		 976static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
977{
978 if (data) {
979 kfree(data->client_address);
980 kfree(data->mount_server.hostname);
981 kfree(data->nfs_server.export_path);
982 kfree(data->nfs_server.hostname);
983 kfree(data->fscache_uniq);
984 security_free_mnt_opts(&data->lsm_opts);
985 kfree(data);
986 }
987}
988
fc50d58f 989/*
cdcd7f9a
CL		 990 * Sanity-check a server address provided by the mount command.
991 *
992 * Address family must be initialized, and address must not be
993 * the ANY address for that family.
fc50d58f
CL		 994 */
995static int nfs_verify_server_address(struct sockaddr *addr)
996{
997 switch (addr->sa_family) {
998 case AF_INET: {
cdcd7f9a 999 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 1000 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 1001 }
1002 case AF_INET6: {
1003 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1004 return !ipv6_addr_any(sa);
fc50d58f
CL		 1005 }
1006 }
1007
53a0b9c4 1008 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 1009 return 0;
1010}
1011
4cfd74fc
CL		 1012/*
1013 * Select between a default port value and a user-specified port value.
1014 * If a zero value is set, then autobind will be used.
1015 */
f5855fec 1016static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1017 const unsigned short default_port)
1018{
f5855fec
TM		 1019 if (*port == NFS_UNSPEC_PORT)
1020 *port = default_port;
4cfd74fc 1021
f5855fec 1022 rpc_set_port(sap, *port);
4cfd74fc
CL		 1023}
1024
259875ef
TM		 1025/*
1026 * Sanity check the NFS transport protocol.
1027 *
1028 */
1029static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1030{
1031 switch (mnt->nfs_server.protocol) {
1032 case XPRT_TRANSPORT_UDP:
1033 case XPRT_TRANSPORT_TCP:
1034 case XPRT_TRANSPORT_RDMA:
1035 break;
1036 default:
1037 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1038 }
1039}
1040
1041/*
1042 * For text based NFSv2/v3 mounts, the mount protocol transport default
1043 * settings should depend upon the specified NFS transport.
1044 */
1045static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1046{
1047 nfs_validate_transport_protocol(mnt);
1048
1049 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1050 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1051 return;
1052 switch (mnt->nfs_server.protocol) {
1053 case XPRT_TRANSPORT_UDP:
1054 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1055 break;
1056 case XPRT_TRANSPORT_TCP:
1057 case XPRT_TRANSPORT_RDMA:
1058 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1059 }
1060}
1061
01060c89
CL		 1062/*
1063 * Parse the value of the 'sec=' option.
01060c89
CL		 1064 */
1065static int nfs_parse_security_flavors(char *value,
1066 struct nfs_parsed_mount_data *mnt)
1067{
1068 substring_t args[MAX_OPT_ARGS];
1069
1070 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1071
1072 switch (match_token(value, nfs_secflavor_tokens, args)) {
1073 case Opt_sec_none:
01060c89
CL		 1074 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1075 break;
1076 case Opt_sec_sys:
01060c89
CL		 1077 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1078 break;
1079 case Opt_sec_krb5:
01060c89
CL		 1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1081 break;
1082 case Opt_sec_krb5i:
01060c89
CL		 1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1084 break;
1085 case Opt_sec_krb5p:
01060c89
CL		 1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1087 break;
1088 case Opt_sec_lkey:
01060c89
CL		 1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1090 break;
1091 case Opt_sec_lkeyi:
01060c89
CL		 1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1093 break;
1094 case Opt_sec_lkeyp:
01060c89
CL		 1095 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1096 break;
1097 case Opt_sec_spkm:
01060c89
CL		 1098 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1099 break;
1100 case Opt_sec_spkmi:
01060c89
CL		 1101 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1102 break;
1103 case Opt_sec_spkmp:
01060c89
CL		 1104 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1105 break;
1106 default:
1107 return 0;
1108 }
1109
9b7160c5 1110 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1111 mnt->auth_flavor_len = 1;
01060c89
CL		 1112 return 1;
1113}
1114
0d71b058
TM		 1115static int nfs_parse_version_string(char *string,
1116 struct nfs_parsed_mount_data *mnt,
1117 substring_t *args)
1118{
1119 mnt->flags &= ~NFS_MOUNT_VER3;
1120 switch (match_token(string, nfs_vers_tokens, args)) {
1121 case Opt_vers_2:
1122 mnt->version = 2;
1123 break;
1124 case Opt_vers_3:
1125 mnt->flags |= NFS_MOUNT_VER3;
1126 mnt->version = 3;
1127 break;
1128 case Opt_vers_4:
1129 /* Backward compatibility option. In future,
1130 * the mount program should always supply
1131 * a NFSv4 minor version number.
1132 */
1133 mnt->version = 4;
1134 break;
1135 case Opt_vers_4_0:
1136 mnt->version = 4;
1137 mnt->minorversion = 0;
1138 break;
1139 case Opt_vers_4_1:
1140 mnt->version = 4;
1141 mnt->minorversion = 1;
1142 break;
1143 default:
1144 return 0;
1145 }
1146 return 1;
1147}
1148
c5cb09b6
RL		 1149static int nfs_get_option_str(substring_t args[], char **option)
1150{
1151 kfree(*option);
1152 *option = match_strdup(args);
1153 return !option;
1154}
1155
1156static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1157{
1158 int rc;
1159 char *string;
1160
1161 string = match_strdup(args);
1162 if (string == NULL)
1163 return -ENOMEM;
1164 rc = strict_strtoul(string, 10, option);
1165 kfree(string);
1166
1167 return rc;
1168}
1169
bf0fd768
CL		 1170/*
1171 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1172 * a data structure. The whole mount string is processed; bad options are
1173 * skipped as they are encountered. If there were no errors, return 1;
1174 * otherwise return 0 (zero).
bf0fd768
CL		 1175 */
1176static int nfs_parse_mount_options(char *raw,
1177 struct nfs_parsed_mount_data *mnt)
1178{
f9c3a380 1179 char *p, *string, *secdata;
d23c45fd 1180 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1181 unsigned short protofamily = AF_UNSPEC;
1182 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1183
1184 if (!raw) {
1185 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1186 return 1;
1187 }
1188 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1189
f9c3a380
EP		 1190 secdata = alloc_secdata();
1191 if (!secdata)
1192 goto out_nomem;
1193
1194 rc = security_sb_copy_data(raw, secdata);
1195 if (rc)
1196 goto out_security_failure;
1197
1198 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1199 if (rc)
1200 goto out_security_failure;
1201
1202 free_secdata(secdata);
1203
bf0fd768
CL		 1204 while ((p = strsep(&raw, ",")) != NULL) {
1205 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1206 unsigned long option;
1207 int token;
bf0fd768
CL		 1208
1209 if (!*p)
1210 continue;
1211
1212 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1213
1214 token = match_token(p, nfs_mount_option_tokens, args);
1215 switch (token) {
f45663ce
CL		 1216
1217 /*
1218 * boolean options: foo/nofoo
1219 */
bf0fd768
CL		 1220 case Opt_soft:
1221 mnt->flags |= NFS_MOUNT_SOFT;
1222 break;
1223 case Opt_hard:
1224 mnt->flags &= ~NFS_MOUNT_SOFT;
1225 break;
bf0fd768
CL		 1226 case Opt_posix:
1227 mnt->flags |= NFS_MOUNT_POSIX;
1228 break;
1229 case Opt_noposix:
1230 mnt->flags &= ~NFS_MOUNT_POSIX;
1231 break;
1232 case Opt_cto:
1233 mnt->flags &= ~NFS_MOUNT_NOCTO;
1234 break;
1235 case Opt_nocto:
1236 mnt->flags |= NFS_MOUNT_NOCTO;
1237 break;
1238 case Opt_ac:
1239 mnt->flags &= ~NFS_MOUNT_NOAC;
1240 break;
1241 case Opt_noac:
1242 mnt->flags |= NFS_MOUNT_NOAC;
1243 break;
1244 case Opt_lock:
1245 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1246 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1247 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1248 break;
1249 case Opt_nolock:
1250 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1251 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1252 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1253 break;
bf0fd768
CL		 1254 case Opt_udp:
1255 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1256 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1257 break;
1258 case Opt_tcp:
1259 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1260 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1261 break;
2cf7ff7a
TT		 1262 case Opt_rdma:
1263 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1264 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1265 xprt_load_transport(p);
2cf7ff7a 1266 break;
bf0fd768
CL		 1267 case Opt_acl:
1268 mnt->flags &= ~NFS_MOUNT_NOACL;
1269 break;
1270 case Opt_noacl:
1271 mnt->flags |= NFS_MOUNT_NOACL;
1272 break;
1273 case Opt_rdirplus:
1274 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1275 break;
1276 case Opt_nordirplus:
1277 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1278 break;
75180df2
TM		 1279 case Opt_sharecache:
1280 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1281 break;
1282 case Opt_nosharecache:
1283 mnt->flags |= NFS_MOUNT_UNSHARED;
1284 break;
d740351b
CL		 1285 case Opt_resvport:
1286 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1287 break;
1288 case Opt_noresvport:
1289 mnt->flags |= NFS_MOUNT_NORESVPORT;
1290 break;
b797cac7
DH		 1291 case Opt_fscache:
1292 mnt->options |= NFS_OPTION_FSCACHE;
1293 kfree(mnt->fscache_uniq);
1294 mnt->fscache_uniq = NULL;
1295 break;
1296 case Opt_nofscache:
1297 mnt->options &= ~NFS_OPTION_FSCACHE;
1298 kfree(mnt->fscache_uniq);
1299 mnt->fscache_uniq = NULL;
1300 break;
bf0fd768 1301
f45663ce
CL		 1302 /*
1303 * options that take numeric values
1304 */
bf0fd768 1305 case Opt_port:
c5cb09b6
RL		 1306 if (nfs_get_option_ul(args, &option) ||
1307 option > USHRT_MAX)
d23c45fd
CL		 1308 goto out_invalid_value;
1309 mnt->nfs_server.port = option;
bf0fd768
CL		 1310 break;
1311 case Opt_rsize:
c5cb09b6 1312 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1313 goto out_invalid_value;
1314 mnt->rsize = option;
bf0fd768
CL		 1315 break;
1316 case Opt_wsize:
c5cb09b6 1317 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1318 goto out_invalid_value;
1319 mnt->wsize = option;
bf0fd768
CL		 1320 break;
1321 case Opt_bsize:
c5cb09b6 1322 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1323 goto out_invalid_value;
1324 mnt->bsize = option;
bf0fd768
CL		 1325 break;
1326 case Opt_timeo:
c5cb09b6 1327 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1328 goto out_invalid_value;
1329 mnt->timeo = option;
bf0fd768
CL		 1330 break;
1331 case Opt_retrans:
c5cb09b6 1332 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1333 goto out_invalid_value;
1334 mnt->retrans = option;
bf0fd768
CL		 1335 break;
1336 case Opt_acregmin:
c5cb09b6 1337 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1338 goto out_invalid_value;
1339 mnt->acregmin = option;
bf0fd768
CL		 1340 break;
1341 case Opt_acregmax:
c5cb09b6 1342 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1343 goto out_invalid_value;
1344 mnt->acregmax = option;
bf0fd768
CL		 1345 break;
1346 case Opt_acdirmin:
c5cb09b6 1347 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1348 goto out_invalid_value;
1349 mnt->acdirmin = option;
bf0fd768
CL		 1350 break;
1351 case Opt_acdirmax:
c5cb09b6 1352 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1353 goto out_invalid_value;
1354 mnt->acdirmax = option;
bf0fd768
CL		 1355 break;
1356 case Opt_actimeo:
c5cb09b6 1357 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1358 goto out_invalid_value;
1359 mnt->acregmin = mnt->acregmax =
1360 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1361 break;
1362 case Opt_namelen:
c5cb09b6 1363 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1364 goto out_invalid_value;
1365 mnt->namlen = option;
bf0fd768
CL		 1366 break;
1367 case Opt_mountport:
c5cb09b6
RL		 1368 if (nfs_get_option_ul(args, &option) ||
1369 option > USHRT_MAX)
d23c45fd
CL		 1370 goto out_invalid_value;
1371 mnt->mount_server.port = option;
bf0fd768 1372 break;
bf0fd768 1373 case Opt_mountvers:
c5cb09b6 1374 if (nfs_get_option_ul(args, &option) ||
f45663ce 1375 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1376 option > NFS_MNT3_VERSION)
1377 goto out_invalid_value;
1378 mnt->mount_server.version = option;
bf0fd768 1379 break;
3fd5be9e 1380 case Opt_minorversion:
c5cb09b6 1381 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1382 goto out_invalid_value;
1383 if (option > NFS4_MAX_MINOR_VERSION)
1384 goto out_invalid_value;
1385 mnt->minorversion = option;
3fd5be9e 1386 break;
bf0fd768 1387
f45663ce
CL		 1388 /*
1389 * options that take text values
1390 */
0d71b058
TM		 1391 case Opt_nfsvers:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
1395 rc = nfs_parse_version_string(string, mnt, args);
1396 kfree(string);
1397 if (!rc)
1398 goto out_invalid_value;
1399 break;
bf0fd768
CL		 1400 case Opt_sec:
1401 string = match_strdup(args);
1402 if (string == NULL)
1403 goto out_nomem;
01060c89 1404 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1405 kfree(string);
f45663ce 1406 if (!rc) {
f45663ce
CL		 1407 dfprintk(MOUNT, "NFS: unrecognized "
1408 "security flavor\n");
d23c45fd 1409 return 0;
f45663ce 1410 }
bf0fd768
CL		 1411 break;
1412 case Opt_proto:
1413 string = match_strdup(args);
1414 if (string == NULL)
1415 goto out_nomem;
1416 token = match_token(string,
1417 nfs_xprt_protocol_tokens, args);
bf0fd768 1418
ee671b01 1419 protofamily = AF_INET;
bf0fd768 1420 switch (token) {
ee671b01
JL		 1421 case Opt_xprt_udp6:
1422 protofamily = AF_INET6;
fdb66ff4 1423 case Opt_xprt_udp:
bf0fd768 1424 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1425 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1426 break;
ee671b01
JL		 1427 case Opt_xprt_tcp6:
1428 protofamily = AF_INET6;
fdb66ff4 1429 case Opt_xprt_tcp:
bf0fd768 1430 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1431 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1432 break;
2cf7ff7a
TT		 1433 case Opt_xprt_rdma:
1434 /* vector side protocols to TCP */
1435 mnt->flags |= NFS_MOUNT_TCP;
1436 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1437 xprt_load_transport(string);
2cf7ff7a 1438 break;
bf0fd768 1439 default:
f45663ce
CL		 1440 dfprintk(MOUNT, "NFS: unrecognized "
1441 "transport protocol\n");
4223a4a1 1442 kfree(string);
d23c45fd 1443 return 0;
bf0fd768 1444 }
c5cb09b6 1445 kfree(string);
bf0fd768
CL		 1446 break;
1447 case Opt_mountproto:
1448 string = match_strdup(args);
1449 if (string == NULL)
1450 goto out_nomem;
1451 token = match_token(string,
1452 nfs_xprt_protocol_tokens, args);
d508afb4 1453 kfree(string);
bf0fd768 1454
ee671b01 1455 mountfamily = AF_INET;
bf0fd768 1456 switch (token) {
ee671b01
JL		 1457 case Opt_xprt_udp6:
1458 mountfamily = AF_INET6;
fdb66ff4 1459 case Opt_xprt_udp:
0896a725 1460 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1461 break;
ee671b01
JL		 1462 case Opt_xprt_tcp6:
1463 mountfamily = AF_INET6;
fdb66ff4 1464 case Opt_xprt_tcp:
0896a725 1465 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1466 break;
2cf7ff7a 1467 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1468 default:
f45663ce
CL		 1469 dfprintk(MOUNT, "NFS: unrecognized "
1470 "transport protocol\n");
d23c45fd 1471 return 0;
bf0fd768
CL		 1472 }
1473 break;
1474 case Opt_addr:
1475 string = match_strdup(args);
1476 if (string == NULL)
1477 goto out_nomem;
53a0b9c4 1478 mnt->nfs_server.addrlen =
b48e1278 1479 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1480 (struct sockaddr *)
1481 &mnt->nfs_server.address,
1482 sizeof(mnt->nfs_server.address));
bf0fd768 1483 kfree(string);
53a0b9c4
CL		 1484 if (mnt->nfs_server.addrlen == 0)
1485 goto out_invalid_address;
bf0fd768
CL		 1486 break;
1487 case Opt_clientaddr:
c5cb09b6 1488 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1489 goto out_nomem;
bf0fd768 1490 break;
33832034 1491 case Opt_mounthost:
c5cb09b6
RL		 1492 if (nfs_get_option_str(args,
1493 &mnt->mount_server.hostname))
33832034 1494 goto out_nomem;
33832034 1495 break;
0ac83779 1496 case Opt_mountaddr:
bf0fd768
CL		 1497 string = match_strdup(args);
1498 if (string == NULL)
1499 goto out_nomem;
53a0b9c4 1500 mnt->mount_server.addrlen =
b48e1278 1501 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1502 (struct sockaddr *)
1503 &mnt->mount_server.address,
1504 sizeof(mnt->mount_server.address));
bf0fd768 1505 kfree(string);
53a0b9c4
CL		 1506 if (mnt->mount_server.addrlen == 0)
1507 goto out_invalid_address;
bf0fd768 1508 break;
7973c1f1
TM		 1509 case Opt_lookupcache:
1510 string = match_strdup(args);
1511 if (string == NULL)
1512 goto out_nomem;
1513 token = match_token(string,
1514 nfs_lookupcache_tokens, args);
1515 kfree(string);
1516 switch (token) {
1517 case Opt_lookupcache_all:
1518 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1519 break;
1520 case Opt_lookupcache_positive:
1521 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1522 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1523 break;
1524 case Opt_lookupcache_none:
1525 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1526 break;
1527 default:
7973c1f1
TM		 1528 dfprintk(MOUNT, "NFS: invalid "
1529 "lookupcache argument\n");
d23c45fd 1530 return 0;
7973c1f1
TM		 1531 };
1532 break;
a6d5ff64 1533 case Opt_fscache_uniq:
c5cb09b6 1534 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1535 goto out_nomem;
a6d5ff64
CL		 1536 mnt->options |= NFS_OPTION_FSCACHE;
1537 break;
5eebde23
SJ		 1538 case Opt_local_lock:
1539 string = match_strdup(args);
1540 if (string == NULL)
1541 goto out_nomem;
1542 token = match_token(string, nfs_local_lock_tokens,
1543 args);
1544 kfree(string);
1545 switch (token) {
1546 case Opt_local_lock_all:
1547 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1548 NFS_MOUNT_LOCAL_FCNTL);
1549 break;
1550 case Opt_local_lock_flock:
1551 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1552 break;
1553 case Opt_local_lock_posix:
1554 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1555 break;
1556 case Opt_local_lock_none:
1557 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1558 NFS_MOUNT_LOCAL_FCNTL);
1559 break;
1560 default:
1561 dfprintk(MOUNT, "NFS: invalid "
1562 "local_lock argument\n");
1563 return 0;
1564 };
1565 break;
bf0fd768 1566
f45663ce
CL		 1567 /*
1568 * Special options
1569 */
1570 case Opt_sloppy:
1571 sloppy = 1;
1572 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1573 break;
bf0fd768
CL		 1574 case Opt_userspace:
1575 case Opt_deprecated:
d33e4dfe
CL		 1576 dfprintk(MOUNT, "NFS: ignoring mount option "
1577 "'%s'\n", p);
bf0fd768
CL		 1578 break;
1579
1580 default:
d23c45fd 1581 invalid_option = 1;
f45663ce
CL		 1582 dfprintk(MOUNT, "NFS: unrecognized mount option "
1583 "'%s'\n", p);
bf0fd768
CL		 1584 }
1585 }
1586
d23c45fd
CL		 1587 if (!sloppy && invalid_option)
1588 return 0;
1589
571b7554
WAA		 1590 if (mnt->minorversion && mnt->version != 4)
1591 goto out_minorversion_mismatch;
1592
ee671b01
JL		 1593 /*
1594 * verify that any proto=/mountproto= options match the address
1595 * familiies in the addr=/mountaddr= options.
1596 */
1597 if (protofamily != AF_UNSPEC &&
1598 protofamily != mnt->nfs_server.address.ss_family)
1599 goto out_proto_mismatch;
1600
1601 if (mountfamily != AF_UNSPEC) {
1602 if (mnt->mount_server.addrlen) {
1603 if (mountfamily != mnt->mount_server.address.ss_family)
1604 goto out_mountproto_mismatch;
1605 } else {
1606 if (mountfamily != mnt->nfs_server.address.ss_family)
1607 goto out_mountproto_mismatch;
1608 }
1609 }
1610
bf0fd768
CL		 1611 return 1;
1612
ee671b01
JL		 1613out_mountproto_mismatch:
1614 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1615 "option\n");
1616 return 0;
1617out_proto_mismatch:
1618 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1619 return 0;
53a0b9c4
CL		 1620out_invalid_address:
1621 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1622 return 0;
d23c45fd 1623out_invalid_value:
53a0b9c4 1624 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1625 return 0;
571b7554
WAA		 1626out_minorversion_mismatch:
1627 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1628 "minorversion=%u\n", mnt->version, mnt->minorversion);
1629 return 0;
bf0fd768
CL		 1630out_nomem:
1631 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1632 return 0;
f9c3a380
EP		 1633out_security_failure:
1634 free_secdata(secdata);
1635 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1636 return 0;
bf0fd768
CL		 1637}
1638
ec88f28d
CL		 1639/*
1640 * Match the requested auth flavors with the list returned by
1641 * the server. Returns zero and sets the mount's authentication
1642 * flavor on success; returns -EACCES if server does not support
1643 * the requested flavor.
1644 */
1645static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1646 struct nfs_mount_request *request)
1647{
1648 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1649
5eecfde6
CL		 1650 /*
1651 * Certain releases of Linux's mountd return an empty
1652 * flavor list. To prevent behavioral regression with
1653 * these servers (ie. rejecting mounts that used to
1654 * succeed), revert to pre-2.6.32 behavior (no checking)
1655 * if the returned flavor list is empty.
1656 */
1657 if (server_authlist_len == 0)
1658 return 0;
1659
ec88f28d
CL		 1660 /*
1661 * We avoid sophisticated negotiating here, as there are
1662 * plenty of cases where we can get it wrong, providing
1663 * either too little or too much security.
1664 *
1665 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1666 * flavor listed first. However, some servers list
1667 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1668 * preferred default, in args->auth_flavors[0] if user
1669 * didn't specify sec= mount option.
1670 */
1671 for (i = 0; i < args->auth_flavor_len; i++)
1672 for (j = 0; j < server_authlist_len; j++)
1673 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1674 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1675 request->auth_flavs[j]);
1676 args->auth_flavors[0] = request->auth_flavs[j];
1677 return 0;
1678 }
1679
1680 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1681 nfs_umount(request);
1682 return -EACCES;
1683}
1684
0076d7b7
CL		 1685/*
1686 * Use the remote server's MOUNT service to request the NFS file handle
1687 * corresponding to the provided path.
1688 */
486aa699
BS		 1689static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1690 struct nfs_fh *root_fh)
0076d7b7 1691{
ec88f28d
CL		 1692 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1693 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1694 struct nfs_mount_request request = {
1695 .sap = (struct sockaddr *)
1696 &args->mount_server.address,
1697 .dirpath = args->nfs_server.export_path,
1698 .protocol = args->mount_server.protocol,
1699 .fh = root_fh,
50a737f8 1700 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1701 .auth_flav_len = &server_authlist_len,
1702 .auth_flavs = server_authlist,
6d59b8d5 1703 .net = args->net,
c5d120f8 1704 };
4c568017 1705 int status;
0076d7b7
CL		 1706
1707 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1708 switch (args->version) {
1709 default:
1710 args->mount_server.version = NFS_MNT3_VERSION;
1711 break;
1712 case 2:
1713 args->mount_server.version = NFS_MNT_VERSION;
1714 }
0076d7b7 1715 }
c5d120f8 1716 request.version = args->mount_server.version;
0076d7b7 1717
33832034 1718 if (args->mount_server.hostname)
c5d120f8 1719 request.hostname = args->mount_server.hostname;
33832034 1720 else
c5d120f8 1721 request.hostname = args->nfs_server.hostname;
33832034 1722
0076d7b7
CL		 1723 /*
1724 * Construct the mount server's address.
1725 */
4c568017 1726 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1727 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1728 args->nfs_server.addrlen);
1729 args->mount_server.addrlen = args->nfs_server.addrlen;
1730 }
c5d120f8 1731 request.salen = args->mount_server.addrlen;
f5855fec 1732 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1733
1734 /*
1735 * Now ask the mount server to map our export path
1736 * to a file handle.
1737 */
c5d120f8 1738 status = nfs_mount(&request);
ec88f28d
CL		 1739 if (status != 0) {
1740 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1741 request.hostname, status);
1742 return status;
1743 }
0076d7b7 1744
ec88f28d
CL		 1745 /*
1746 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1747 */
1748 if (args->mount_server.version != NFS_MNT3_VERSION)
1749 return 0;
1750 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1751}
1752
486aa699
BS		 1753static struct dentry *nfs_try_mount(int flags, const char *dev_name,
1754 struct nfs_fh *mntfh,
1755 struct nfs_mount_info *mount_info)
1756{
1757 int status;
1758 struct nfs_server *server;
1759
b72e4f42
BS		 1760 if (mount_info->parsed->need_mount) {
1761 status = nfs_request_mount(mount_info->parsed, mntfh);
1762 if (status)
1763 return ERR_PTR(status);
1764 }
486aa699
BS		 1765
1766 /* Get a volume representation */
1767 server = nfs_create_server(mount_info->parsed, mntfh);
1768 if (IS_ERR(server))
1769 return ERR_CAST(server);
1770
1771 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mntfh, mount_info);
1772}
1773
c12bacec
RL		 1774/*
1775 * Split "dev_name" into "hostname:export_path".
1776 *
1777 * The leftmost colon demarks the split between the server's hostname
1778 * and the export path. If the hostname starts with a left square
1779 * bracket, then it may contain colons.
1780 *
1781 * Note: caller frees hostname and export path, even on error.
1782 */
1783static int nfs_parse_devname(const char *dev_name,
1784 char **hostname, size_t maxnamlen,
1785 char **export_path, size_t maxpathlen)
dc045898
CL		 1786{
1787 size_t len;
c12bacec 1788 char *end;
dc045898 1789
c12bacec
RL		 1790 /* Is the host name protected with square brakcets? */
1791 if (*dev_name == '[') {
1792 end = strchr(++dev_name, ']');
1793 if (end == NULL || end[1] != ':')
dc045898 1794 goto out_bad_devname;
dc045898 1795
c12bacec
RL		 1796 len = end - dev_name;
1797 end++;
1798 } else {
1799 char *comma;
dc045898 1800
c12bacec
RL		 1801 end = strchr(dev_name, ':');
1802 if (end == NULL)
1803 goto out_bad_devname;
1804 len = end - dev_name;
d1aa0825 1805
c12bacec
RL		 1806 /* kill possible hostname list: not supported */
1807 comma = strchr(dev_name, ',');
1808 if (comma != NULL && comma < end)
1809 *comma = 0;
1810 }
d1aa0825 1811
d1aa0825
CL		 1812 if (len > maxnamlen)
1813 goto out_hostname;
1814
1815 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1816 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1817 if (*hostname == NULL)
1818 goto out_nomem;
c12bacec 1819 len = strlen(++end);
d1aa0825
CL		 1820 if (len > maxpathlen)
1821 goto out_path;
1822 *export_path = kstrndup(end, len, GFP_KERNEL);
1823 if (!*export_path)
1824 goto out_nomem;
1825
c12bacec 1826 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1827 return 0;
1828
1829out_bad_devname:
1830 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1831 return -EINVAL;
1832
1833out_nomem:
1834 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1835 return -ENOMEM;
1836
1837out_hostname:
1838 dfprintk(MOUNT, "NFS: server hostname too long\n");
1839 return -ENAMETOOLONG;
1840
1841out_path:
1842 dfprintk(MOUNT, "NFS: export pathname too long\n");
1843 return -ENAMETOOLONG;
1844}
1845
f7b422b1 1846/*
54ceac45
DH		 1847 * Validate the NFS2/NFS3 mount data
1848 * - fills in the mount root filehandle
136d558c
CL		 1849 *
1850 * For option strings, user space handles the following behaviors:
1851 *
1852 * + DNS: mapping server host name to IP address ("addr=" option)
1853 *
1854 * + failure mode: how to behave if a mount request can't be handled
1855 * immediately ("fg/bg" option)
1856 *
1857 * + retry: how often to retry a mount request ("retry=" option)
1858 *
1859 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1860 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1861 */
d72c727c
BS		 1862static int nfs23_validate_mount_data(void *options,
1863 struct nfs_parsed_mount_data *args,
1864 struct nfs_fh *mntfh,
1865 const char *dev_name)
f7b422b1 1866{
2283f8d6 1867 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1868 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1869
5df36e78
CL		 1870 if (data == NULL)
1871 goto out_no_data;
f7b422b1 1872
54ceac45 1873 switch (data->version) {
5df36e78
CL		 1874 case 1:
1875 data->namlen = 0;
1876 case 2:
1877 data->bsize = 0;
1878 case 3:
1879 if (data->flags & NFS_MOUNT_VER3)
1880 goto out_no_v3;
1881 data->root.size = NFS2_FHSIZE;
1882 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1883 case 4:
1884 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1885 goto out_no_sec;
1886 case 5:
1887 memset(data->context, 0, sizeof(data->context));
1888 case 6:
b7e24457
TM		 1889 if (data->flags & NFS_MOUNT_VER3) {
1890 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1891 goto out_invalid_fh;
5df36e78 1892 mntfh->size = data->root.size;
764302cc
CL		 1893 args->version = 3;
1894 } else {
5df36e78 1895 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1896 args->version = 2;
1897 }
5df36e78 1898
5df36e78
CL		 1899
1900 memcpy(mntfh->data, data->root.data, mntfh->size);
1901 if (mntfh->size < sizeof(mntfh->data))
1902 memset(mntfh->data + mntfh->size, 0,
1903 sizeof(mntfh->data) - mntfh->size);
6e88e061 1904
2283f8d6
TT		 1905 /*
1906 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1907 * can deal with.
1908 */
ff3525a5 1909 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1910 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1911 args->rsize = data->rsize;
1912 args->wsize = data->wsize;
2283f8d6
TT		 1913 args->timeo = data->timeo;
1914 args->retrans = data->retrans;
1915 args->acregmin = data->acregmin;
1916 args->acregmax = data->acregmax;
1917 args->acdirmin = data->acdirmin;
1918 args->acdirmax = data->acdirmax;
b72e4f42 1919 args->need_mount = false;
4c568017 1920
4cfd74fc 1921 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1922 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1923 if (!nfs_verify_server_address(sap))
4c568017
CL		 1924 goto out_no_address;
1925
2283f8d6 1926 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1927 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1928 /* N.B. caller will free nfs_server.hostname in all cases */
1929 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1930 args->namlen = data->namlen;
1931 args->bsize = data->bsize;
dd07c947
CL		 1932
1933 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1934 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1935 if (!args->nfs_server.hostname)
1936 goto out_nomem;
f9c3a380 1937
5eebde23
SJ		 1938 if (!(data->flags & NFS_MOUNT_NONLM))
1939 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1940 NFS_MOUNT_LOCAL_FCNTL);
1941 else
1942 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1943 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1944 /*
1945 * The legacy version 6 binary mount data from userspace has a
1946 * field used only to transport selinux information into the
1947 * the kernel. To continue to support that functionality we
1948 * have a touch of selinux knowledge here in the NFS code. The
1949 * userspace code converted context=blah to just blah so we are
1950 * converting back to the full string selinux understands.
1951 */
1952 if (data->context[0]){
1953#ifdef CONFIG_SECURITY_SELINUX
1954 int rc;
1955 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1956 if (!opts_str)
1957 return -ENOMEM;
1958 strcpy(opts_str, "context=");
1959 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1960 strcat(opts_str, &data->context[0]);
1961 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1962 kfree(opts_str);
1963 if (rc)
1964 return rc;
1965#else
1966 return -EINVAL;
1967#endif
1968 }
1969
5df36e78 1970 break;
b72e4f42
BS		 1971 default:
1972 return NFS_TEXT_DATA;
f7b422b1 1973 }
54ceac45
DH		 1974
1975#ifndef CONFIG_NFS_V3
8a6e5deb 1976 if (args->version == 3)
5df36e78
CL		 1977 goto out_v3_not_compiled;
1978#endif /* !CONFIG_NFS_V3 */
f7b422b1 1979
5df36e78 1980 return 0;
f7b422b1 1981
5df36e78
CL		 1982out_no_data:
1983 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1984 return -EINVAL;
54ceac45 1985
5df36e78
CL		 1986out_no_v3:
1987 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1988 data->version);
1989 return -EINVAL;
f7b422b1 1990
5df36e78
CL		 1991out_no_sec:
1992 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1993 return -EINVAL;
1994
5df36e78
CL		 1995#ifndef CONFIG_NFS_V3
1996out_v3_not_compiled:
1997 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1998 return -EPROTONOSUPPORT;
1999#endif /* !CONFIG_NFS_V3 */
2000
63649bd7
CG		 2001out_nomem:
2002 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2003 return -ENOMEM;
2004
5df36e78
CL		 2005out_no_address:
2006 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2007 return -EINVAL;
2008
2009out_invalid_fh:
2010 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2011 return -EINVAL;
f7b422b1
DH		 2012}
2013
d72c727c
BS		 2014#ifdef CONFIG_NFS_V4
2015static int nfs_validate_mount_data(struct file_system_type *fs_type,
2016 void *options,
2017 struct nfs_parsed_mount_data *args,
2018 struct nfs_fh *mntfh,
2019 const char *dev_name)
2020{
2021 if (fs_type == &nfs_fs_type)
2022 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2023 return nfs4_validate_mount_data(options, args, dev_name);
2024}
2025#else
2026static int nfs_validate_mount_data(struct file_system_type *fs_type,
2027 void *options,
2028 struct nfs_parsed_mount_data *args,
2029 struct nfs_fh *mntfh,
2030 const char *dev_name)
2031{
2032 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2033}
2034#endif
2035
b72e4f42
BS		 2036static int nfs_validate_text_mount_data(void *options,
2037 struct nfs_parsed_mount_data *args,
2038 const char *dev_name)
2039{
2040 int port = 0;
2041 int max_namelen = PAGE_SIZE;
2042 int max_pathlen = NFS_MAXPATHLEN;
2043 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2044
2045 if (nfs_parse_mount_options((char *)options, args) == 0)
2046 return -EINVAL;
2047
2048 if (!nfs_verify_server_address(sap))
2049 goto out_no_address;
2050
2051 if (args->version == 4) {
2052#ifdef CONFIG_NFS_V4
2053 port = NFS_PORT;
2054 max_namelen = NFS4_MAXNAMLEN;
2055 max_pathlen = NFS4_MAXPATHLEN;
2056 nfs_validate_transport_protocol(args);
2057 nfs4_validate_mount_flags(args);
2058#else
2059 goto out_v4_not_compiled;
2060#endif /* CONFIG_NFS_V4 */
2061 } else
2062 nfs_set_mount_transport_protocol(args);
2063
2064 nfs_set_port(sap, &args->nfs_server.port, port);
2065
2066 if (args->auth_flavor_len > 1)
2067 goto out_bad_auth;
2068
2069 return nfs_parse_devname(dev_name,
2070 &args->nfs_server.hostname,
2071 max_namelen,
2072 &args->nfs_server.export_path,
2073 max_pathlen);
2074
2075#ifndef CONFIG_NFS_V4
2076out_v4_not_compiled:
2077 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2078 return -EPROTONOSUPPORT;
2079#endif /* !CONFIG_NFS_V4 */
2080
2081out_no_address:
2082 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2083 return -EINVAL;
2084
2085out_bad_auth:
2086 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2087 return -EINVAL;
2088}
2089
48b605f8
JL		 2090static int
2091nfs_compare_remount_data(struct nfs_server *nfss,
2092 struct nfs_parsed_mount_data *data)
2093{
2094 if (data->flags != nfss->flags ||
2095 data->rsize != nfss->rsize ||
2096 data->wsize != nfss->wsize ||
2097 data->retrans != nfss->client->cl_timeout->to_retries ||
2098 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2099 data->acregmin != nfss->acregmin / HZ ||
2100 data->acregmax != nfss->acregmax / HZ ||
2101 data->acdirmin != nfss->acdirmin / HZ ||
2102 data->acdirmax != nfss->acdirmax / HZ ||
2103 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2104 data->nfs_server.port != nfss->port ||
48b605f8 2105 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2106 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2107 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2108 return -EINVAL;
2109
2110 return 0;
2111}
2112
2113static int
2114nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2115{
2116 int error;
2117 struct nfs_server *nfss = sb->s_fs_info;
2118 struct nfs_parsed_mount_data *data;
2119 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2120 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2121 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2122
2123 /*
2124 * Userspace mount programs that send binary options generally send
2125 * them populated with default values. We have no way to know which
2126 * ones were explicitly specified. Fall back to legacy behavior and
2127 * just return success.
2128 */
31c94469
MZ		 2129 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2130 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2131 options->version <= 6))))
48b605f8
JL		 2132 return 0;
2133
2134 data = kzalloc(sizeof(*data), GFP_KERNEL);
2135 if (data == NULL)
2136 return -ENOMEM;
2137
2138 /* fill out struct with values from existing mount */
2139 data->flags = nfss->flags;
2140 data->rsize = nfss->rsize;
2141 data->wsize = nfss->wsize;
2142 data->retrans = nfss->client->cl_timeout->to_retries;
2143 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2144 data->acregmin = nfss->acregmin / HZ;
2145 data->acregmax = nfss->acregmax / HZ;
2146 data->acdirmin = nfss->acdirmin / HZ;
2147 data->acdirmax = nfss->acdirmax / HZ;
2148 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2149 data->nfs_server.port = nfss->port;
48b605f8
JL		 2150 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2151 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2152 data->nfs_server.addrlen);
2153
2154 /* overwrite those values with any that were specified */
2155 error = nfs_parse_mount_options((char *)options, data);
2156 if (error < 0)
2157 goto out;
2158
26c4c170
JL		 2159 /*
2160 * noac is a special case. It implies -o sync, but that's not
2161 * necessarily reflected in the mtab options. do_remount_sb
2162 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2163 * remount options, so we have to explicitly reset it.
2164 */
2165 if (data->flags & NFS_MOUNT_NOAC)
2166 *flags |= MS_SYNCHRONOUS;
2167
48b605f8
JL		 2168 /* compare new mount options with old ones */
2169 error = nfs_compare_remount_data(nfss, data);
2170out:
2171 kfree(data);
2172 return error;
2173}
2174
f7b422b1 2175/*
54ceac45 2176 * Initialise the common bits of the superblock
f7b422b1 2177 */
54ceac45 2178static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2179{
54ceac45 2180 struct nfs_server *server = NFS_SB(sb);
5006a76c 2181
54ceac45 2182 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2183
54ceac45
DH		 2184 /* We probably want something more informative here */
2185 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2186 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2187
54ceac45
DH		 2188 if (sb->s_blocksize == 0)
2189 sb->s_blocksize = nfs_block_bits(server->wsize,
2190 &sb->s_blocksize_bits);
f7b422b1 2191
32a88aa1
JA		 2192 sb->s_bdi = &server->backing_dev_info;
2193
54ceac45 2194 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2195}
2196
2197/*
54ceac45 2198 * Finish setting up an NFS2/3 superblock
f7b422b1 2199 */
2283f8d6 2200static void nfs_fill_super(struct super_block *sb,
c40f8d1d 2201 struct nfs_mount_info *mount_info)
f7b422b1 2202{
c40f8d1d 2203 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2204 struct nfs_server *server = NFS_SB(sb);
5006a76c 2205
54ceac45
DH		 2206 sb->s_blocksize_bits = 0;
2207 sb->s_blocksize = 0;
2208 if (data->bsize)
2209 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2210
8a6e5deb 2211 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2212 /* The VFS shouldn't apply the umask to mode bits. We will do
2213 * so ourselves when necessary.
2214 */
2215 sb->s_flags |= MS_POSIXACL;
2216 sb->s_time_gran = 1;
816724e6 2217 }
54ceac45
DH		 2218
2219 sb->s_op = &nfs_sops;
2220 nfs_initialise_sb(sb);
f7b422b1
DH		 2221}
2222
2223/*
54ceac45 2224 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2225 */
54ceac45 2226static void nfs_clone_super(struct super_block *sb,
8c958e0c 2227 struct nfs_mount_info *mount_info)
f7b422b1 2228{
8c958e0c 2229 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2230 struct nfs_server *server = NFS_SB(sb);
2231
2232 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2233 sb->s_blocksize = old_sb->s_blocksize;
2234 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2235
8a6e5deb 2236 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2237 /* The VFS shouldn't apply the umask to mode bits. We will do
2238 * so ourselves when necessary.
f7b422b1
DH		 2239 */
2240 sb->s_flags |= MS_POSIXACL;
f7b422b1 2241 sb->s_time_gran = 1;
f7b422b1
DH		 2242 }
2243
54ceac45
DH		 2244 sb->s_op = old_sb->s_op;
2245 nfs_initialise_sb(sb);
f7b422b1
DH		 2246}
2247
275a5d24
TM		 2248static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2249{
2250 const struct nfs_server *a = s->s_fs_info;
2251 const struct rpc_clnt *clnt_a = a->client;
2252 const struct rpc_clnt *clnt_b = b->client;
2253
2254 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2255 goto Ebusy;
2256 if (a->nfs_client != b->nfs_client)
2257 goto Ebusy;
2258 if (a->flags != b->flags)
2259 goto Ebusy;
2260 if (a->wsize != b->wsize)
2261 goto Ebusy;
2262 if (a->rsize != b->rsize)
2263 goto Ebusy;
2264 if (a->acregmin != b->acregmin)
2265 goto Ebusy;
2266 if (a->acregmax != b->acregmax)
2267 goto Ebusy;
2268 if (a->acdirmin != b->acdirmin)
2269 goto Ebusy;
2270 if (a->acdirmax != b->acdirmax)
2271 goto Ebusy;
2272 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2273 goto Ebusy;
e89a5a43 2274 return 1;
275a5d24 2275Ebusy:
e89a5a43
TM		 2276 return 0;
2277}
2278
2279struct nfs_sb_mountdata {
2280 struct nfs_server *server;
2281 int mntflags;
2282};
2283
2284static int nfs_set_super(struct super_block *s, void *data)
2285{
2286 struct nfs_sb_mountdata *sb_mntdata = data;
2287 struct nfs_server *server = sb_mntdata->server;
2288 int ret;
2289
2290 s->s_flags = sb_mntdata->mntflags;
2291 s->s_fs_info = server;
8b244ff2 2292 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2293 ret = set_anon_super(s, server);
2294 if (ret == 0)
2295 server->s_dev = s->s_dev;
2296 return ret;
2297}
2298
fd00a8ff
CL		 2299static int nfs_compare_super_address(struct nfs_server *server1,
2300 struct nfs_server *server2)
2301{
2302 struct sockaddr *sap1, *sap2;
2303
2304 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2305 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2306
2307 if (sap1->sa_family != sap2->sa_family)
2308 return 0;
2309
2310 switch (sap1->sa_family) {
2311 case AF_INET: {
2312 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2313 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2314 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2315 return 0;
2316 if (sin1->sin_port != sin2->sin_port)
2317 return 0;
2318 break;
2319 }
2320 case AF_INET6: {
2321 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2322 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2323 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2324 return 0;
2325 if (sin1->sin6_port != sin2->sin6_port)
2326 return 0;
2327 break;
2328 }
2329 default:
2330 return 0;
2331 }
2332
2333 return 1;
2334}
2335
e89a5a43
TM		 2336static int nfs_compare_super(struct super_block *sb, void *data)
2337{
2338 struct nfs_sb_mountdata *sb_mntdata = data;
2339 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2340 int mntflags = sb_mntdata->mntflags;
2341
fd00a8ff 2342 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2343 return 0;
2344 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2345 if (old->flags & NFS_MOUNT_UNSHARED)
2346 return 0;
2347 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2348 return 0;
2349 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2350}
2351
2311b943
BS		 2352static void nfs_get_cache_cookie(struct super_block *sb,
2353 struct nfs_parsed_mount_data *parsed,
2354 struct nfs_clone_mount *cloned)
2355{
2356 char *uniq = NULL;
2357 int ulen = 0;
2358
2359 if (parsed && parsed->fscache_uniq) {
2360 uniq = parsed->fscache_uniq;
2361 ulen = strlen(parsed->fscache_uniq);
2362 } else if (cloned) {
2363 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2364 if (mnt_s->fscache_key) {
2365 uniq = mnt_s->fscache_key->key.uniquifier;
2366 ulen = mnt_s->fscache_key->key.uniq_len;
2367 };
2368 }
2369
2370 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2371}
2372
fa799759
MS		 2373static int nfs_bdi_register(struct nfs_server *server)
2374{
2375 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2376}
2377
3d176e3f
BS		 2378static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2379 struct nfs_mount_info *mount_info)
2380{
2381 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2382}
2383
2384static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2385 struct nfs_mount_info *mount_info)
2386{
2387 /* clone any lsm security options from the parent to the new sb */
2388 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2389 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2390 return -ESTALE;
2391 return 0;
2392}
2393
c40f8d1d
BS		 2394static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2395 struct nfs_server *server,
2396 int flags, const char *dev_name,
2397 struct nfs_fh *mntfh,
2398 struct nfs_mount_info *mount_info)
f7b422b1 2399{
f7b422b1 2400 struct super_block *s;
01194981 2401 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2402 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2403 struct nfs_sb_mountdata sb_mntdata = {
2404 .mntflags = flags,
c40f8d1d 2405 .server = server,
e89a5a43 2406 };
01194981 2407 int error;
33852a1f 2408
75180df2
TM		 2409 if (server->flags & NFS_MOUNT_UNSHARED)
2410 compare_super = NULL;
2411
fb2088cc
SP		 2412 /* -o noac implies -o sync */
2413 if (server->flags & NFS_MOUNT_NOAC)
2414 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2415
54ceac45 2416 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2417 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2418 if (IS_ERR(s)) {
01194981 2419 mntroot = ERR_CAST(s);
54ceac45 2420 goto out_err_nosb;
816724e6
TM		 2421 }
2422
54ceac45
DH		 2423 if (s->s_fs_info != server) {
2424 nfs_free_server(server);
2425 server = NULL;
fa799759
MS		 2426 } else {
2427 error = nfs_bdi_register(server);
01194981
AV		 2428 if (error) {
2429 mntroot = ERR_PTR(error);
cfbc0683 2430 goto error_splat_bdi;
01194981 2431 }
54ceac45 2432 }
f7b422b1 2433
54ceac45
DH		 2434 if (!s->s_root) {
2435 /* initial superblock/root creation */
c40f8d1d 2436 mount_info->fill_super(s, mount_info);
3d176e3f 2437 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2438 }
f7b422b1 2439
0d5839ad 2440 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2441 if (IS_ERR(mntroot))
54ceac45 2442 goto error_splat_super;
816724e6 2443
3d176e3f 2444 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2445 if (error)
2446 goto error_splat_root;
2447
54ceac45 2448 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2449
2450out:
01194981 2451 return mntroot;
816724e6 2452
54ceac45
DH		 2453out_err_nosb:
2454 nfs_free_server(server);
0655960f 2455 goto out;
54ceac45 2456
f9c3a380
EP		 2457error_splat_root:
2458 dput(mntroot);
01194981 2459 mntroot = ERR_PTR(error);
54ceac45 2460error_splat_super:
cfbc0683
N		 2461 if (server && !s->s_root)
2462 bdi_unregister(&server->backing_dev_info);
2463error_splat_bdi:
6f5bbff9 2464 deactivate_locked_super(s);
0655960f 2465 goto out;
f7b422b1
DH		 2466}
2467
c40f8d1d
BS		 2468static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2469 int flags, const char *dev_name, void *raw_data)
2470{
c40f8d1d
BS		 2471 struct nfs_mount_info mount_info = {
2472 .fill_super = nfs_fill_super,
3d176e3f 2473 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2474 };
2475 struct nfs_fh *mntfh;
2476 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2477 int error;
2478
46058d46 2479 mount_info.parsed = nfs_alloc_parsed_mount_data();
c40f8d1d 2480 mntfh = nfs_alloc_fhandle();
46058d46 2481 if (mount_info.parsed == NULL || mntfh == NULL)
c40f8d1d
BS		 2482 goto out;
2483
2484 /* Validate the mount data */
46058d46 2485 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mntfh, dev_name);
b72e4f42 2486 if (error == NFS_TEXT_DATA)
46058d46 2487 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2488 if (error < 0) {
2489 mntroot = ERR_PTR(error);
2490 goto out;
2491 }
c40f8d1d
BS		 2492
2493#ifdef CONFIG_NFS_V4
46058d46
BS		 2494 if (mount_info.parsed->version == 4)
2495 mntroot = nfs4_try_mount(flags, dev_name, mount_info.parsed);
486aa699 2496 else
c40f8d1d 2497#endif /* CONFIG_NFS_V4 */
486aa699 2498 mntroot = nfs_try_mount(flags, dev_name, mntfh, &mount_info);
c40f8d1d 2499
c40f8d1d 2500out:
46058d46 2501 nfs_free_parsed_mount_data(mount_info.parsed);
c40f8d1d
BS		 2502 nfs_free_fhandle(mntfh);
2503 return mntroot;
2504}
2505
387c149b
TM		 2506/*
2507 * Ensure that we unregister the bdi before kill_anon_super
2508 * releases the device name
2509 */
2510static void nfs_put_super(struct super_block *s)
2511{
2512 struct nfs_server *server = NFS_SB(s);
2513
2514 bdi_unregister(&server->backing_dev_info);
2515}
2516
54ceac45
DH		 2517/*
2518 * Destroy an NFS2/3 superblock
2519 */
f7b422b1
DH		 2520static void nfs_kill_super(struct super_block *s)
2521{
2522 struct nfs_server *server = NFS_SB(s);
2523
2524 kill_anon_super(s);
08734048 2525 nfs_fscache_release_super_cookie(s);
54ceac45 2526 nfs_free_server(server);
f7b422b1
DH		 2527}
2528
54ceac45 2529/*
8c958e0c 2530 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2531 */
31f43471 2532static struct dentry *
8c958e0c
BS		 2533nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2534 const char *dev_name, struct nfs_mount_info *mount_info)
f7b422b1 2535{
8c958e0c 2536 struct nfs_clone_mount *data = mount_info->cloned;
54ceac45 2537 struct nfs_server *server;
3d176e3f 2538 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45 2539 int error;
f7b422b1 2540
8c958e0c 2541 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2542
54ceac45 2543 /* create a new volume representation */
7e6eb683 2544 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2545 if (IS_ERR(server)) {
2546 error = PTR_ERR(server);
3d176e3f 2547 goto out_err;
4c1fe2f7 2548 }
f7b422b1 2549
3d176e3f 2550 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, data->fh, mount_info);
8c958e0c 2551 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2552out:
31f43471 2553 return mntroot;
24c8dbbb 2554
3d176e3f 2555out_err:
8c958e0c 2556 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2557 goto out;
f7b422b1
DH		 2558}
2559
8c958e0c
BS		 2560/*
2561 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2562 */
2563static struct dentry *
2564nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2565 const char *dev_name, void *raw_data)
2566{
2567 struct nfs_mount_info mount_info = {
2568 .fill_super = nfs_clone_super,
3d176e3f 2569 .set_security = nfs_clone_sb_security,
8c958e0c
BS		 2570 .cloned = raw_data,
2571 };
2572 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2573}
2574
54ceac45
DH		 2575#ifdef CONFIG_NFS_V4
2576
f7b422b1 2577/*
54ceac45 2578 * Finish setting up a cloned NFS4 superblock
f7b422b1 2579 */
54ceac45 2580static void nfs4_clone_super(struct super_block *sb,
8c958e0c 2581 struct nfs_mount_info *mount_info)
f7b422b1 2582{
8c958e0c 2583 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2584 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2585 sb->s_blocksize = old_sb->s_blocksize;
2586 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2587 sb->s_time_gran = 1;
54ceac45 2588 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2589 /*
2590 * The VFS shouldn't apply the umask to mode bits. We will do
2591 * so ourselves when necessary.
2592 */
2593 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2594 sb->s_xattr = old_sb->s_xattr;
2595 nfs_initialise_sb(sb);
f7b422b1
DH		 2596}
2597
54ceac45
DH		 2598/*
2599 * Set up an NFS4 superblock
2600 */
c40f8d1d
BS		 2601static void nfs4_fill_super(struct super_block *sb,
2602 struct nfs_mount_info *mount_info)
f7b422b1 2603{
54ceac45
DH		 2604 sb->s_time_gran = 1;
2605 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2606 /*
2607 * The VFS shouldn't apply the umask to mode bits. We will do
2608 * so ourselves when necessary.
2609 */
2610 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2611 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2612 nfs_initialise_sb(sb);
f7b422b1
DH		 2613}
2614
01c3f052
TM		 2615static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2616{
5eebde23
SJ		 2617 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2618 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2619}
2620
f0768ebd
CL		 2621/*
2622 * Validate NFSv4 mount options
2623 */
91ea40b9
TT		 2624static int nfs4_validate_mount_data(void *options,
2625 struct nfs_parsed_mount_data *args,
2626 const char *dev_name)
f0768ebd 2627{
4cfd74fc 2628 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2629 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2630 char *c;
2631
2632 if (data == NULL)
2633 goto out_no_data;
2634
2635 switch (data->version) {
2636 case 1:
4c568017
CL		 2637 if (data->host_addrlen > sizeof(args->nfs_server.address))
2638 goto out_no_address;
2639 if (data->host_addrlen == 0)
f0768ebd 2640 goto out_no_address;
4c568017 2641 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2642 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2643 return -EFAULT;
4cfd74fc 2644 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2645 goto out_no_address;
2646
6738b251
CL		 2647 if (data->auth_flavourlen) {
2648 if (data->auth_flavourlen > 1)
2649 goto out_inval_auth;
20c71f5e 2650 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2651 data->auth_flavours,
20c71f5e 2652 sizeof(args->auth_flavors[0])))
f0768ebd 2653 return -EFAULT;
f0768ebd
CL		 2654 }
2655
2656 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2657 if (IS_ERR(c))
2658 return PTR_ERR(c);
91ea40b9 2659 args->nfs_server.hostname = c;
f0768ebd
CL		 2660
2661 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
91ea40b9
TT		 2664 args->nfs_server.export_path = c;
2665 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2666
2667 c = strndup_user(data->client_addr.data, 16);
2668 if (IS_ERR(c))
2669 return PTR_ERR(c);
91ea40b9
TT		 2670 args->client_address = c;
2671
2672 /*
2673 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2674 * can deal with.
2675 */
2676
2677 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2678 args->rsize = data->rsize;
2679 args->wsize = data->wsize;
2680 args->timeo = data->timeo;
2681 args->retrans = data->retrans;
2682 args->acregmin = data->acregmin;
2683 args->acregmax = data->acregmax;
2684 args->acdirmin = data->acdirmin;
2685 args->acdirmax = data->acdirmax;
2686 args->nfs_server.protocol = data->proto;
259875ef 2687 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2688
2689 break;
7630c852 2690 default:
b72e4f42 2691 return NFS_TEXT_DATA;
f0768ebd
CL		 2692 }
2693
2694 return 0;
2695
2696out_no_data:
2697 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2698 return -EINVAL;
2699
2700out_inval_auth:
2701 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2702 data->auth_flavourlen);
2703 return -EINVAL;
2704
2705out_no_address:
2706 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2707 return -EINVAL;
f0768ebd
CL		 2708}
2709
54ceac45 2710/*
c02d7adf 2711 * Get the superblock for the NFS4 root partition
54ceac45 2712 */
31f43471
AV		 2713static struct dentry *
2714nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2715 const char *dev_name, void *raw_data)
f7b422b1 2716{
c40f8d1d
BS		 2717 struct nfs_mount_info mount_info = {
2718 .fill_super = nfs4_fill_super,
3d176e3f 2719 .set_security = nfs_set_sb_security,
c40f8d1d
BS		 2720 .parsed = raw_data,
2721 };
54ceac45 2722 struct nfs_server *server;
33852a1f 2723 struct nfs_fh *mntfh;
c40f8d1d 2724 struct dentry *mntroot = ERR_PTR(-ENOMEM);
33852a1f 2725
b157b06c 2726 mntfh = nfs_alloc_fhandle();
c40f8d1d 2727 if (mount_info.parsed == NULL || mntfh == NULL)
8a0d551a 2728 goto out;
f9c3a380 2729
54ceac45 2730 /* Get a volume representation */
c40f8d1d 2731 server = nfs4_create_server(mount_info.parsed, mntfh);
54ceac45 2732 if (IS_ERR(server)) {
c40f8d1d 2733 mntroot = ERR_CAST(server);
29eb981a 2734 goto out;
f7b422b1
DH		 2735 }
2736
c40f8d1d
BS		 2737 mntroot = nfs_fs_mount_common(fs_type, server, flags,
2738 dev_name, mntfh, &mount_info);
29eb981a
CL		 2739
2740out:
b157b06c 2741 nfs_free_fhandle(mntfh);
c40f8d1d 2742 return mntroot;
f7b422b1
DH		 2743}
2744
c02d7adf
TM		 2745static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2746 int flags, void *data, const char *hostname)
2747{
2748 struct vfsmount *root_mnt;
2749 char *root_devname;
2750 size_t len;
2751
98a2139f 2752 len = strlen(hostname) + 5;
c02d7adf
TM		 2753 root_devname = kmalloc(len, GFP_KERNEL);
2754 if (root_devname == NULL)
2755 return ERR_PTR(-ENOMEM);
98a2139f
JK		 2756 /* Does hostname needs to be enclosed in brackets? */
2757 if (strchr(hostname, ':'))
2758 snprintf(root_devname, len, "[%s]:/", hostname);
2759 else
2760 snprintf(root_devname, len, "%s:/", hostname);
c02d7adf
TM		 2761 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2762 kfree(root_devname);
2763 return root_mnt;
2764}
2765
ce587e07
TM		 2766struct nfs_referral_count {
2767 struct list_head list;
2768 const struct task_struct *task;
2769 unsigned int referral_count;
2770};
2771
2772static LIST_HEAD(nfs_referral_count_list);
2773static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2774
2775static struct nfs_referral_count *nfs_find_referral_count(void)
2776{
2777 struct nfs_referral_count *p;
2778
2779 list_for_each_entry(p, &nfs_referral_count_list, list) {
2780 if (p->task == current)
2781 return p;
2782 }
2783 return NULL;
2784}
2785
2786#define NFS_MAX_NESTED_REFERRALS 2
2787
2788static int nfs_referral_loop_protect(void)
2789{
2790 struct nfs_referral_count *p, *new;
2791 int ret = -ENOMEM;
2792
2793 new = kmalloc(sizeof(*new), GFP_KERNEL);
2794 if (!new)
2795 goto out;
2796 new->task = current;
2797 new->referral_count = 1;
2798
2799 ret = 0;
2800 spin_lock(&nfs_referral_count_list_lock);
2801 p = nfs_find_referral_count();
2802 if (p != NULL) {
2803 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2804 ret = -ELOOP;
2805 else
2806 p->referral_count++;
2807 } else {
2808 list_add(&new->list, &nfs_referral_count_list);
2809 new = NULL;
2810 }
2811 spin_unlock(&nfs_referral_count_list_lock);
2812 kfree(new);
2813out:
2814 return ret;
2815}
2816
2817static void nfs_referral_loop_unprotect(void)
2818{
2819 struct nfs_referral_count *p;
2820
2821 spin_lock(&nfs_referral_count_list_lock);
2822 p = nfs_find_referral_count();
2823 p->referral_count--;
2824 if (p->referral_count == 0)
2825 list_del(&p->list);
2826 else
2827 p = NULL;
2828 spin_unlock(&nfs_referral_count_list_lock);
2829 kfree(p);
2830}
2831
01194981
AV		 2832static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2833 const char *export_path)
c02d7adf 2834{
01194981 2835 struct dentry *dentry;
5352d3b6 2836 int err;
c02d7adf 2837
5352d3b6
AV		 2838 if (IS_ERR(root_mnt))
2839 return ERR_CAST(root_mnt);
2840
2841 err = nfs_referral_loop_protect();
2842 if (err) {
ea441d11 2843 mntput(root_mnt);
5352d3b6 2844 return ERR_PTR(err);
ea441d11 2845 }
c02d7adf 2846
ea441d11
AV		 2847 dentry = mount_subtree(root_mnt, export_path);
2848 nfs_referral_loop_unprotect();
c02d7adf 2849
01194981 2850 return dentry;
c02d7adf
TM		 2851}
2852
01194981
AV		 2853static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2854 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2855{
2856 char *export_path;
2857 struct vfsmount *root_mnt;
01194981 2858 struct dentry *res;
a6fe23be
CL		 2859
2860 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2861
2862 export_path = data->nfs_server.export_path;
2863 data->nfs_server.export_path = "/";
2864 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2865 data->nfs_server.hostname);
2866 data->nfs_server.export_path = export_path;
2867
5352d3b6 2868 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2869
01194981
AV		 2870 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2871 IS_ERR(res) ? PTR_ERR(res) : 0,
2872 IS_ERR(res) ? " [error]" : "");
2873 return res;
a6fe23be
CL		 2874}
2875
c02d7adf
TM		 2876/*
2877 * Get the superblock for an NFS4 mountpoint
2878 */
01194981
AV		 2879static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2880 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2881{
2882 struct nfs_parsed_mount_data *data;
c02d7adf 2883 int error = -ENOMEM;
01194981 2884 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2885
db833351 2886 data = nfs_alloc_parsed_mount_data();
c02d7adf 2887 if (data == NULL)
8a0d551a 2888 goto out;
c02d7adf
TM		 2889
2890 /* Validate the mount data */
d72c727c 2891 error = nfs_validate_mount_data(fs_type, raw_data, data, NULL, dev_name);
b72e4f42
BS		 2892 if (error == NFS_TEXT_DATA)
2893 error = nfs_validate_text_mount_data(raw_data, data, dev_name);
01194981
AV		 2894 if (error < 0) {
2895 res = ERR_PTR(error);
c02d7adf 2896 goto out;
01194981 2897 }
c02d7adf 2898
01194981
AV		 2899 res = nfs4_try_mount(flags, dev_name, data);
2900 if (IS_ERR(res))
2901 error = PTR_ERR(res);
c02d7adf
TM		 2902
2903out:
8a0d551a 2904 nfs_free_parsed_mount_data(data);
01194981 2905 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2906 error != 0 ? " [error]" : "");
01194981 2907 return res;
c02d7adf
TM		 2908}
2909
f7b422b1
DH		 2910static void nfs4_kill_super(struct super_block *sb)
2911{
2912 struct nfs_server *server = NFS_SB(sb);
2913
0f3e66c6 2914 dprintk("--> %s\n", __func__);
515d8611 2915 nfs_super_return_all_delegations(sb);
f7b422b1 2916 kill_anon_super(sb);
08734048 2917 nfs_fscache_release_super_cookie(sb);
54ceac45 2918 nfs_free_server(server);
0f3e66c6 2919 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2920}
2921
2922/*
54ceac45 2923 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2924 */
31f43471
AV		 2925static struct dentry *
2926nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2927 const char *dev_name, void *raw_data)
f7b422b1 2928{
8c958e0c
BS		 2929 struct nfs_mount_info mount_info = {
2930 .fill_super = nfs4_clone_super,
3d176e3f 2931 .set_security = nfs_clone_sb_security,
8c958e0c 2932 .cloned = raw_data,
e89a5a43 2933 };
8c958e0c 2934 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
f7b422b1
DH		 2935}
2936
31f43471
AV		 2937static struct dentry *
2938nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2939 const char *dev_name, void *raw_data)
f7b422b1 2940{
21e4b82e
BS		 2941 struct nfs_mount_info mount_info = {
2942 .fill_super = nfs4_fill_super,
2943 .set_security = nfs_clone_sb_security,
2944 .cloned = raw_data,
2945 };
54ceac45 2946 struct nfs_server *server;
21e4b82e 2947 struct dentry *mntroot = ERR_PTR(-ENOMEM);
4f727296 2948 struct nfs_fh *mntfh;
54ceac45
DH		 2949
2950 dprintk("--> nfs4_referral_get_sb()\n");
2951
4f727296 2952 mntfh = nfs_alloc_fhandle();
21e4b82e
BS		 2953 if (mount_info.cloned == NULL || mntfh == NULL)
2954 goto out;
4f727296 2955
54ceac45 2956 /* create a new volume representation */
21e4b82e 2957 server = nfs4_create_referral_server(mount_info.cloned, mntfh);
54ceac45 2958 if (IS_ERR(server)) {
21e4b82e
BS		 2959 mntroot = ERR_CAST(server);
2960 goto out;
e9cc6c23 2961 }
54ceac45 2962
21e4b82e
BS		 2963 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, mntfh, &mount_info);
2964out:
4f727296 2965 nfs_free_fhandle(mntfh);
31f43471 2966 return mntroot;
f7b422b1
DH		 2967}
2968
c02d7adf
TM		 2969/*
2970 * Create an NFS4 server record on referral traversal
2971 */
01194981
AV		 2972static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2973 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2974{
2975 struct nfs_clone_mount *data = raw_data;
2976 char *export_path;
2977 struct vfsmount *root_mnt;
01194981 2978 struct dentry *res;
c02d7adf 2979
01194981 2980 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 2981
2982 export_path = data->mnt_path;
2983 data->mnt_path = "/";
2984
2985 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2986 flags, data, data->hostname);
2987 data->mnt_path = export_path;
2988
5352d3b6 2989 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 2990 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2991 IS_ERR(res) ? PTR_ERR(res) : 0,
2992 IS_ERR(res) ? " [error]" : "");
2993 return res;
c02d7adf
TM		 2994}
2995
54ceac45 2996#endif /* CONFIG_NFS_V4 */
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