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NFS: Don't pass mount data to nfs_fscache_get_super_cookie()
[deliverable/linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
2446ab60 56#include <linux/rcupdate.h>
f7b422b1 57
f7b422b1
DH		 58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
1e657bd5
PZ		 70#ifdef CONFIG_NFS_V3
71#define NFS_DEFAULT_VERSION 3
72#else
73#define NFS_DEFAULT_VERSION 2
74#endif
75
bf0fd768
CL		 76enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
bf0fd768
CL		 79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
2cf7ff7a 83 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
75180df2 86 Opt_sharecache, Opt_nosharecache,
d740351b 87 Opt_resvport, Opt_noresvport,
b797cac7 88 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
e887cbcf 99 Opt_mountvers,
3fd5be9e 100 Opt_minorversion,
bf0fd768
CL		 101
102 /* Mount options that take string arguments */
0d71b058 103 Opt_nfsvers,
33832034 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 106 Opt_lookupcache,
b797cac7 107 Opt_fscache_uniq,
5eebde23 108 Opt_local_lock,
bf0fd768 109
f45663ce
CL		 110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 112
113 Opt_err
114};
115
a447c093 116static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
ecbb3845
CL		 119 { Opt_userspace, "retry=%s" },
120
f45663ce
CL		 121 { Opt_sloppy, "sloppy" },
122
bf0fd768
CL		 123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
d33e4dfe
CL		 125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
bf0fd768
CL		 127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
bf0fd768
CL		 135 { Opt_udp, "udp" },
136 { Opt_tcp, "tcp" },
2cf7ff7a 137 { Opt_rdma, "rdma" },
bf0fd768
CL		 138 { Opt_acl, "acl" },
139 { Opt_noacl, "noacl" },
140 { Opt_rdirplus, "rdirplus" },
141 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 142 { Opt_sharecache, "sharecache" },
143 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 144 { Opt_resvport, "resvport" },
145 { Opt_noresvport, "noresvport" },
b797cac7 146 { Opt_fscache, "fsc" },
b797cac7 147 { Opt_nofscache, "nofsc" },
bf0fd768 148
a5a16bae
CL		 149 { Opt_port, "port=%s" },
150 { Opt_rsize, "rsize=%s" },
151 { Opt_wsize, "wsize=%s" },
152 { Opt_bsize, "bsize=%s" },
153 { Opt_timeo, "timeo=%s" },
154 { Opt_retrans, "retrans=%s" },
155 { Opt_acregmin, "acregmin=%s" },
156 { Opt_acregmax, "acregmax=%s" },
157 { Opt_acdirmin, "acdirmin=%s" },
158 { Opt_acdirmax, "acdirmax=%s" },
159 { Opt_actimeo, "actimeo=%s" },
160 { Opt_namelen, "namlen=%s" },
161 { Opt_mountport, "mountport=%s" },
162 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 163 { Opt_minorversion, "minorversion=%s" },
164
a5a16bae
CL		 165 { Opt_nfsvers, "nfsvers=%s" },
166 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 167
168 { Opt_sec, "sec=%s" },
169 { Opt_proto, "proto=%s" },
170 { Opt_mountproto, "mountproto=%s" },
171 { Opt_addr, "addr=%s" },
172 { Opt_clientaddr, "clientaddr=%s" },
33832034 173 { Opt_mounthost, "mounthost=%s" },
0ac83779 174 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 175
7973c1f1 176 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 177 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 178 { Opt_local_lock, "local_lock=%s" },
7973c1f1 179
3862279a
TM		 180 /* The following needs to be listed after all other options */
181 { Opt_nfsvers, "v%s" },
182
bf0fd768
CL		 183 { Opt_err, NULL }
184};
185
186enum {
ee671b01 187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 188
189 Opt_xprt_err
190};
191
a447c093 192static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 193 { Opt_xprt_udp, "udp" },
ee671b01 194 { Opt_xprt_udp6, "udp6" },
bf0fd768 195 { Opt_xprt_tcp, "tcp" },
ee671b01 196 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 197 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 198
199 { Opt_xprt_err, NULL }
200};
201
202enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209};
210
a447c093 211static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
8d042218
OK		 224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
bf0fd768
CL		 228 { Opt_sec_err, NULL }
229};
230
7973c1f1
TM		 231enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236};
237
238static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245};
246
5eebde23
SJ		 247enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252};
253
254static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261};
262
0d71b058
TM		 263enum {
264 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
265 Opt_vers_4_1,
266
267 Opt_vers_err
268};
269
270static match_table_t nfs_vers_tokens = {
271 { Opt_vers_2, "2" },
272 { Opt_vers_3, "3" },
273 { Opt_vers_4, "4" },
274 { Opt_vers_4_0, "4.0" },
275 { Opt_vers_4_1, "4.1" },
276
277 { Opt_vers_err, NULL }
278};
bf0fd768 279
42faad99 280static void nfs_umount_begin(struct super_block *);
816724e6 281static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 282static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 283static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 284static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 285static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 286static struct dentry *nfs_fs_mount(struct file_system_type *,
287 int, const char *, void *);
31f43471
AV		 288static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
289 int flags, const char *dev_name, void *raw_data);
387c149b 290static void nfs_put_super(struct super_block *);
f7b422b1 291static void nfs_kill_super(struct super_block *);
48b605f8 292static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 293
294static struct file_system_type nfs_fs_type = {
295 .owner = THIS_MODULE,
296 .name = "nfs",
01194981 297 .mount = nfs_fs_mount,
f7b422b1 298 .kill_sb = nfs_kill_super,
349457cc 299 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 300};
301
54ceac45 302struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 303 .owner = THIS_MODULE,
304 .name = "nfs",
31f43471 305 .mount = nfs_xdev_mount,
f7b422b1 306 .kill_sb = nfs_kill_super,
349457cc 307 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 308};
309
ee9b6d61 310static const struct super_operations nfs_sops = {
f7b422b1
DH		 311 .alloc_inode = nfs_alloc_inode,
312 .destroy_inode = nfs_destroy_inode,
313 .write_inode = nfs_write_inode,
387c149b 314 .put_super = nfs_put_super,
f7b422b1 315 .statfs = nfs_statfs,
b57922d9 316 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 317 .umount_begin = nfs_umount_begin,
318 .show_options = nfs_show_options,
c7f404b4
AV		 319 .show_devname = nfs_show_devname,
320 .show_path = nfs_show_path,
f7b422b1 321 .show_stats = nfs_show_stats,
48b605f8 322 .remount_fs = nfs_remount,
f7b422b1
DH		 323};
324
325#ifdef CONFIG_NFS_V4
7630c852
CL		 326static int nfs4_validate_text_mount_data(void *options,
327 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 328static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
329 struct nfs_parsed_mount_data *data);
330static struct dentry *nfs4_mount(struct file_system_type *fs_type,
331 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 332static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
333 int flags, const char *dev_name, void *raw_data);
334static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
335 int flags, const char *dev_name, void *raw_data);
01194981
AV		 336static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
337 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 338static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
339 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 340static void nfs4_kill_super(struct super_block *sb);
341
342static struct file_system_type nfs4_fs_type = {
343 .owner = THIS_MODULE,
344 .name = "nfs4",
01194981 345 .mount = nfs4_mount,
f7b422b1 346 .kill_sb = nfs4_kill_super,
349457cc 347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 348};
349
c02d7adf
TM		 350static struct file_system_type nfs4_remote_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
31f43471 353 .mount = nfs4_remote_mount,
c02d7adf
TM		 354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356};
357
54ceac45 358struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 359 .owner = THIS_MODULE,
360 .name = "nfs4",
31f43471 361 .mount = nfs4_xdev_mount,
f7b422b1 362 .kill_sb = nfs4_kill_super,
349457cc 363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 364};
365
c02d7adf
TM		 366static struct file_system_type nfs4_remote_referral_fs_type = {
367 .owner = THIS_MODULE,
368 .name = "nfs4",
31f43471 369 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 370 .kill_sb = nfs4_kill_super,
371 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
372};
373
54ceac45 374struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 375 .owner = THIS_MODULE,
376 .name = "nfs4",
01194981 377 .mount = nfs4_referral_mount,
f7b422b1 378 .kill_sb = nfs4_kill_super,
349457cc 379 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 380};
381
ee9b6d61 382static const struct super_operations nfs4_sops = {
f7b422b1
DH		 383 .alloc_inode = nfs_alloc_inode,
384 .destroy_inode = nfs_destroy_inode,
385 .write_inode = nfs_write_inode,
387c149b 386 .put_super = nfs_put_super,
f7b422b1 387 .statfs = nfs_statfs,
b57922d9 388 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 389 .umount_begin = nfs_umount_begin,
390 .show_options = nfs_show_options,
c7f404b4
AV		 391 .show_devname = nfs_show_devname,
392 .show_path = nfs_show_path,
f7b422b1 393 .show_stats = nfs_show_stats,
48b605f8 394 .remount_fs = nfs_remount,
f7b422b1
DH		 395};
396#endif
397
8e1f936b
RR		 398static struct shrinker acl_shrinker = {
399 .shrink = nfs_access_cache_shrinker,
400 .seeks = DEFAULT_SEEKS,
401};
979df72e 402
f7b422b1
DH		 403/*
404 * Register the NFS filesystems
405 */
406int __init register_nfs_fs(void)
407{
408 int ret;
409
410 ret = register_filesystem(&nfs_fs_type);
411 if (ret < 0)
412 goto error_0;
413
f7b422b1
DH		 414 ret = nfs_register_sysctl();
415 if (ret < 0)
416 goto error_1;
89a09141 417#ifdef CONFIG_NFS_V4
f7b422b1
DH		 418 ret = register_filesystem(&nfs4_fs_type);
419 if (ret < 0)
420 goto error_2;
421#endif
8e1f936b 422 register_shrinker(&acl_shrinker);
f7b422b1
DH		 423 return 0;
424
425#ifdef CONFIG_NFS_V4
426error_2:
427 nfs_unregister_sysctl();
89a09141 428#endif
f7b422b1
DH		 429error_1:
430 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 431error_0:
432 return ret;
433}
434
435/*
436 * Unregister the NFS filesystems
437 */
438void __exit unregister_nfs_fs(void)
439{
8e1f936b 440 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 441#ifdef CONFIG_NFS_V4
442 unregister_filesystem(&nfs4_fs_type);
f7b422b1 443#endif
49af7ee1 444 nfs_unregister_sysctl();
f7b422b1
DH		 445 unregister_filesystem(&nfs_fs_type);
446}
447
1daef0a8 448void nfs_sb_active(struct super_block *sb)
ef818a28 449{
1daef0a8 450 struct nfs_server *server = NFS_SB(sb);
ef818a28 451
1daef0a8
TM		 452 if (atomic_inc_return(&server->active) == 1)
453 atomic_inc(&sb->s_active);
ef818a28
SD		 454}
455
1daef0a8 456void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 457{
458 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 459
460 if (atomic_dec_and_test(&server->active))
461 deactivate_super(sb);
ef818a28
SD		 462}
463
f7b422b1
DH		 464/*
465 * Deliver file system statistics to userspace
466 */
816724e6 467static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 468{
0c7d90cf 469 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 470 unsigned char blockbits;
471 unsigned long blockres;
0c7d90cf 472 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 473 struct nfs_fsstat res;
474 int error = -ENOMEM;
475
476 res.fattr = nfs_alloc_fattr();
477 if (res.fattr == NULL)
478 goto out_err;
f7b422b1 479
8fa5c000 480 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 481 if (unlikely(error == -ESTALE)) {
482 struct dentry *pd_dentry;
483
484 pd_dentry = dget_parent(dentry);
485 if (pd_dentry != NULL) {
486 nfs_zap_caches(pd_dentry->d_inode);
487 dput(pd_dentry);
488 }
489 }
ca7e9a0d 490 nfs_free_fattr(res.fattr);
f7b422b1
DH		 491 if (error < 0)
492 goto out_err;
ca7e9a0d 493
1a0ba9ae 494 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 495
496 /*
497 * Current versions of glibc do not correctly handle the
498 * case where f_frsize != f_bsize. Eventually we want to
499 * report the value of wtmult in this field.
500 */
0c7d90cf 501 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 502
503 /*
504 * On most *nix systems, f_blocks, f_bfree, and f_bavail
505 * are reported in units of f_frsize. Linux hasn't had
506 * an f_frsize field in its statfs struct until recently,
507 * thus historically Linux's sys_statfs reports these
508 * fields in units of f_bsize.
509 */
0c7d90cf
DH		 510 buf->f_bsize = dentry->d_sb->s_blocksize;
511 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 512 blockres = (1 << blockbits) - 1;
513 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
514 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
515 buf->f_bavail = (res.abytes + blockres) >> blockbits;
516
517 buf->f_files = res.tfiles;
518 buf->f_ffree = res.afiles;
519
520 buf->f_namelen = server->namelen;
1a0ba9ae 521
f7b422b1
DH		 522 return 0;
523
524 out_err:
3110ff80 525 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 526 return error;
f7b422b1
DH		 527}
528
7d4e2747
DH		 529/*
530 * Map the security flavour number to a name
531 */
81039f1f
TM		 532static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
533{
7d4e2747 534 static const struct {
81039f1f
TM		 535 rpc_authflavor_t flavour;
536 const char *str;
537 } sec_flavours[] = {
538 { RPC_AUTH_NULL, "null" },
539 { RPC_AUTH_UNIX, "sys" },
540 { RPC_AUTH_GSS_KRB5, "krb5" },
541 { RPC_AUTH_GSS_KRB5I, "krb5i" },
542 { RPC_AUTH_GSS_KRB5P, "krb5p" },
543 { RPC_AUTH_GSS_LKEY, "lkey" },
544 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
545 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
546 { RPC_AUTH_GSS_SPKM, "spkm" },
547 { RPC_AUTH_GSS_SPKMI, "spkmi" },
548 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 549 { UINT_MAX, "unknown" }
81039f1f
TM		 550 };
551 int i;
552
4d81cd16 553 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 554 if (sec_flavours[i].flavour == flavour)
555 break;
556 }
557 return sec_flavours[i].str;
558}
559
ee671b01
JL		 560static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
561 int showdefaults)
562{
563 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
564
565 seq_printf(m, ",mountproto=");
566 switch (sap->sa_family) {
567 case AF_INET:
568 switch (nfss->mountd_protocol) {
569 case IPPROTO_UDP:
570 seq_printf(m, RPCBIND_NETID_UDP);
571 break;
572 case IPPROTO_TCP:
573 seq_printf(m, RPCBIND_NETID_TCP);
574 break;
575 default:
576 if (showdefaults)
577 seq_printf(m, "auto");
578 }
579 break;
580 case AF_INET6:
581 switch (nfss->mountd_protocol) {
582 case IPPROTO_UDP:
583 seq_printf(m, RPCBIND_NETID_UDP6);
584 break;
585 case IPPROTO_TCP:
586 seq_printf(m, RPCBIND_NETID_TCP6);
587 break;
588 default:
589 if (showdefaults)
590 seq_printf(m, "auto");
591 }
592 break;
593 default:
594 if (showdefaults)
595 seq_printf(m, "auto");
596 }
597}
598
82d101d5
CL		 599static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
600 int showdefaults)
601{
602 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
603
d5eff1a3
BS		 604 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
605 return;
606
82d101d5
CL		 607 switch (sap->sa_family) {
608 case AF_INET: {
609 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 610 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 611 break;
612 }
613 case AF_INET6: {
614 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 615 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 616 break;
617 }
618 default:
619 if (showdefaults)
620 seq_printf(m, ",mountaddr=unspecified");
621 }
622
623 if (nfss->mountd_version || showdefaults)
624 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 625 if ((nfss->mountd_port &&
626 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
627 showdefaults)
82d101d5
CL		 628 seq_printf(m, ",mountport=%u", nfss->mountd_port);
629
ee671b01 630 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 631}
632
0be8189f
TM		 633#ifdef CONFIG_NFS_V4
634static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
635 int showdefaults)
636{
637 struct nfs_client *clp = nfss->nfs_client;
638
639 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 640}
641#else
642static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
643 int showdefaults)
644{
645}
646#endif
647
7bbceb6f
TM		 648static void nfs_show_nfs_version(struct seq_file *m,
649 unsigned int version,
650 unsigned int minorversion)
651{
652 seq_printf(m, ",vers=%u", version);
653 if (version == 4)
654 seq_printf(m, ".%u", minorversion);
655}
656
f7b422b1
DH		 657/*
658 * Describe the mount options in force on this server representation
659 */
82d101d5
CL		 660static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
661 int showdefaults)
f7b422b1 662{
509de811 663 static const struct proc_nfs_info {
f7b422b1 664 int flag;
509de811
DH		 665 const char *str;
666 const char *nostr;
f7b422b1
DH		 667 } nfs_info[] = {
668 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 669 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 670 { NFS_MOUNT_NOCTO, ",nocto", "" },
671 { NFS_MOUNT_NOAC, ",noac", "" },
672 { NFS_MOUNT_NONLM, ",nolock", "" },
673 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 674 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 675 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
676 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 677 { 0, NULL, NULL }
678 };
509de811 679 const struct proc_nfs_info *nfs_infop;
8fa5c000 680 struct nfs_client *clp = nfss->nfs_client;
82d101d5 681 u32 version = clp->rpc_ops->version;
7c563cc9 682 int local_flock, local_fcntl;
f7b422b1 683
7bbceb6f 684 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 685 seq_printf(m, ",rsize=%u", nfss->rsize);
686 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 687 if (nfss->bsize != 0)
688 seq_printf(m, ",bsize=%u", nfss->bsize);
689 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 690 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 691 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 692 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 693 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 694 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 695 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 696 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 697 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 698 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
699 if (nfss->flags & nfs_infop->flag)
700 seq_puts(m, nfs_infop->str);
701 else
702 seq_puts(m, nfs_infop->nostr);
703 }
2446ab60 704 rcu_read_lock();
56928edd 705 seq_printf(m, ",proto=%s",
ee671b01 706 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 707 rcu_read_unlock();
82d101d5
CL		 708 if (version == 4) {
709 if (nfss->port != NFS_PORT)
710 seq_printf(m, ",port=%u", nfss->port);
711 } else
712 if (nfss->port)
713 seq_printf(m, ",port=%u", nfss->port);
714
33170233
TM		 715 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
716 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 717 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 718
719 if (version != 4)
720 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 721 else
722 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 723
b797cac7
DH		 724 if (nfss->options & NFS_OPTION_FSCACHE)
725 seq_printf(m, ",fsc");
9b00c643
PL		 726
727 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
728 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
729 seq_printf(m, ",lookupcache=none");
730 else
731 seq_printf(m, ",lookupcache=pos");
732 }
7c563cc9
SJ		 733
734 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
735 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
736
737 if (!local_flock && !local_fcntl)
738 seq_printf(m, ",local_lock=none");
739 else if (local_flock && local_fcntl)
740 seq_printf(m, ",local_lock=all");
741 else if (local_flock)
742 seq_printf(m, ",local_lock=flock");
743 else
744 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 745}
746
747/*
748 * Describe the mount options on this VFS mountpoint
749 */
34c80b1d 750static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 751{
34c80b1d 752 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 753
754 nfs_show_mount_options(m, nfss, 0);
755
2446ab60 756 rcu_read_lock();
5d8515ca
CL		 757 seq_printf(m, ",addr=%s",
758 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
759 RPC_DISPLAY_ADDR));
2446ab60 760 rcu_read_unlock();
f7b422b1
DH		 761
762 return 0;
763}
45402c38
HS		 764
765#ifdef CONFIG_NFS_V4
ae50c0b5 766#ifdef CONFIG_NFS_V4_1
45402c38 767static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 768{
769 if (nfs4_has_session(server->nfs_client))
770 seq_printf(m, ",sessions");
771}
772#else
45402c38
HS		 773static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
774#endif
ae50c0b5
BF		 775#endif
776
777#ifdef CONFIG_NFS_V4_1
45402c38 778static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 779{
780 seq_printf(m, ",pnfs=");
781 if (server->pnfs_curr_ld)
782 seq_printf(m, "%s", server->pnfs_curr_ld->name);
783 else
784 seq_printf(m, "not configured");
785}
7e03b7cc
TM		 786
787static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
788{
789 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
790 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
791 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
792 "date='%llu,%u'",
793 impl_id->name, impl_id->domain,
794 impl_id->date.seconds, impl_id->date.nseconds);
795 }
796}
45402c38 797#else
7e03b7cc
TM		 798#ifdef CONFIG_NFS_V4
799static void show_pnfs(struct seq_file *m, struct nfs_server *server)
800{
801}
45402c38 802#endif
7e03b7cc
TM		 803static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
804{
805}
45402c38 806#endif
f7b422b1 807
d861c630 808static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 809{
810 char *page = (char *) __get_free_page(GFP_KERNEL);
811 char *devname, *dummy;
812 int err = 0;
813 if (!page)
814 return -ENOMEM;
d861c630 815 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 816 if (IS_ERR(devname))
817 err = PTR_ERR(devname);
818 else
819 seq_escape(m, devname, " \t\n\\");
820 free_page((unsigned long)page);
821 return err;
822}
823
a6322de6 824static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 825{
826 seq_puts(m, "/");
827 return 0;
828}
829
f7b422b1
DH		 830/*
831 * Present statistical information for this VFS mountpoint
832 */
64132379 833static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 834{
835 int i, cpu;
64132379 836 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 837 struct rpc_auth *auth = nfss->client->cl_auth;
838 struct nfs_iostats totals = { };
839
840 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
841
842 /*
843 * Display all mount option settings
844 */
845 seq_printf(m, "\n\topts:\t");
64132379
AV		 846 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
847 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
848 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
849 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 850 nfs_show_mount_options(m, nfss, 1);
851
852 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
853
7e03b7cc 854 show_implementation_id(m, nfss);
7d2ed9ac 855
f7b422b1
DH		 856 seq_printf(m, "\n\tcaps:\t");
857 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 858 seq_printf(m, ",wtmult=%u", nfss->wtmult);
859 seq_printf(m, ",dtsize=%u", nfss->dtsize);
860 seq_printf(m, ",bsize=%u", nfss->bsize);
861 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 862
863#ifdef CONFIG_NFS_V4
40c55319 864 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 865 seq_printf(m, "\n\tnfsv4:\t");
866 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
867 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
868 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 869 show_sessions(m, nfss);
870 show_pnfs(m, nfss);
f7b422b1
DH		 871 }
872#endif
873
874 /*
875 * Display security flavor in effect for this mount
876 */
2d767432 877 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 878 if (auth->au_flavor)
2d767432 879 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 880
881 /*
882 * Display superblock I/O counters
883 */
884 for_each_possible_cpu(cpu) {
885 struct nfs_iostats *stats;
886
887 preempt_disable();
888 stats = per_cpu_ptr(nfss->io_stats, cpu);
889
890 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
891 totals.events[i] += stats->events[i];
892 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
893 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 894#ifdef CONFIG_NFS_FSCACHE
895 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
896 totals.fscache[i] += stats->fscache[i];
897#endif
f7b422b1
DH		 898
899 preempt_enable();
900 }
901
902 seq_printf(m, "\n\tevents:\t");
903 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
904 seq_printf(m, "%lu ", totals.events[i]);
905 seq_printf(m, "\n\tbytes:\t");
906 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
907 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 908#ifdef CONFIG_NFS_FSCACHE
909 if (nfss->options & NFS_OPTION_FSCACHE) {
910 seq_printf(m, "\n\tfsc:\t");
911 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
912 seq_printf(m, "%Lu ", totals.bytes[i]);
913 }
914#endif
f7b422b1
DH		 915 seq_printf(m, "\n");
916
917 rpc_print_iostats(m, nfss->client);
918
919 return 0;
920}
921
922/*
923 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 924 * in response to xdev traversals and referrals
f7b422b1 925 */
42faad99 926static void nfs_umount_begin(struct super_block *sb)
f7b422b1 927{
67e55205 928 struct nfs_server *server;
fc6ae3cf
TM		 929 struct rpc_clnt *rpc;
930
67e55205 931 server = NFS_SB(sb);
fc6ae3cf
TM		 932 /* -EIO all pending I/O */
933 rpc = server->client_acl;
934 if (!IS_ERR(rpc))
935 rpc_killall_tasks(rpc);
936 rpc = server->client;
937 if (!IS_ERR(rpc))
938 rpc_killall_tasks(rpc);
f7b422b1
DH		 939}
940
c5811dbd 941static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 942{
943 struct nfs_parsed_mount_data *data;
944
945 data = kzalloc(sizeof(*data), GFP_KERNEL);
946 if (data) {
9423a08a
CL		 947 data->acregmin = NFS_DEF_ACREGMIN;
948 data->acregmax = NFS_DEF_ACREGMAX;
949 data->acdirmin = NFS_DEF_ACDIRMIN;
950 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 951 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 952 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 953 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 954 data->auth_flavors[0] = RPC_AUTH_UNIX;
955 data->auth_flavor_len = 1;
c5811dbd 956 data->version = version;
9423a08a 957 data->minorversion = 0;
9937347a 958 data->net = current->nsproxy->net_ns;
8a0d551a 959 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 960 }
961 return data;
962}
963
8a0d551a
JL		 964static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
965{
966 if (data) {
967 kfree(data->client_address);
968 kfree(data->mount_server.hostname);
969 kfree(data->nfs_server.export_path);
970 kfree(data->nfs_server.hostname);
971 kfree(data->fscache_uniq);
972 security_free_mnt_opts(&data->lsm_opts);
973 kfree(data);
974 }
975}
976
fc50d58f 977/*
cdcd7f9a
CL		 978 * Sanity-check a server address provided by the mount command.
979 *
980 * Address family must be initialized, and address must not be
981 * the ANY address for that family.
fc50d58f
CL		 982 */
983static int nfs_verify_server_address(struct sockaddr *addr)
984{
985 switch (addr->sa_family) {
986 case AF_INET: {
cdcd7f9a 987 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 988 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 989 }
990 case AF_INET6: {
991 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
992 return !ipv6_addr_any(sa);
fc50d58f
CL		 993 }
994 }
995
53a0b9c4 996 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 997 return 0;
998}
999
4cfd74fc
CL		 1000/*
1001 * Select between a default port value and a user-specified port value.
1002 * If a zero value is set, then autobind will be used.
1003 */
f5855fec 1004static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1005 const unsigned short default_port)
1006{
f5855fec
TM		 1007 if (*port == NFS_UNSPEC_PORT)
1008 *port = default_port;
4cfd74fc 1009
f5855fec 1010 rpc_set_port(sap, *port);
4cfd74fc
CL		 1011}
1012
259875ef
TM		 1013/*
1014 * Sanity check the NFS transport protocol.
1015 *
1016 */
1017static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1018{
1019 switch (mnt->nfs_server.protocol) {
1020 case XPRT_TRANSPORT_UDP:
1021 case XPRT_TRANSPORT_TCP:
1022 case XPRT_TRANSPORT_RDMA:
1023 break;
1024 default:
1025 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1026 }
1027}
1028
1029/*
1030 * For text based NFSv2/v3 mounts, the mount protocol transport default
1031 * settings should depend upon the specified NFS transport.
1032 */
1033static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1034{
1035 nfs_validate_transport_protocol(mnt);
1036
1037 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1038 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1039 return;
1040 switch (mnt->nfs_server.protocol) {
1041 case XPRT_TRANSPORT_UDP:
1042 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1043 break;
1044 case XPRT_TRANSPORT_TCP:
1045 case XPRT_TRANSPORT_RDMA:
1046 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1047 }
1048}
1049
01060c89
CL		 1050/*
1051 * Parse the value of the 'sec=' option.
01060c89
CL		 1052 */
1053static int nfs_parse_security_flavors(char *value,
1054 struct nfs_parsed_mount_data *mnt)
1055{
1056 substring_t args[MAX_OPT_ARGS];
1057
1058 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1059
1060 switch (match_token(value, nfs_secflavor_tokens, args)) {
1061 case Opt_sec_none:
01060c89
CL		 1062 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1063 break;
1064 case Opt_sec_sys:
01060c89
CL		 1065 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1066 break;
1067 case Opt_sec_krb5:
01060c89
CL		 1068 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1069 break;
1070 case Opt_sec_krb5i:
01060c89
CL		 1071 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1072 break;
1073 case Opt_sec_krb5p:
01060c89
CL		 1074 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1075 break;
1076 case Opt_sec_lkey:
01060c89
CL		 1077 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1078 break;
1079 case Opt_sec_lkeyi:
01060c89
CL		 1080 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1081 break;
1082 case Opt_sec_lkeyp:
01060c89
CL		 1083 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1084 break;
1085 case Opt_sec_spkm:
01060c89
CL		 1086 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1087 break;
1088 case Opt_sec_spkmi:
01060c89
CL		 1089 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1090 break;
1091 case Opt_sec_spkmp:
01060c89
CL		 1092 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1093 break;
1094 default:
1095 return 0;
1096 }
1097
9b7160c5 1098 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1099 mnt->auth_flavor_len = 1;
01060c89
CL		 1100 return 1;
1101}
1102
0d71b058
TM		 1103static int nfs_parse_version_string(char *string,
1104 struct nfs_parsed_mount_data *mnt,
1105 substring_t *args)
1106{
1107 mnt->flags &= ~NFS_MOUNT_VER3;
1108 switch (match_token(string, nfs_vers_tokens, args)) {
1109 case Opt_vers_2:
1110 mnt->version = 2;
1111 break;
1112 case Opt_vers_3:
1113 mnt->flags |= NFS_MOUNT_VER3;
1114 mnt->version = 3;
1115 break;
1116 case Opt_vers_4:
1117 /* Backward compatibility option. In future,
1118 * the mount program should always supply
1119 * a NFSv4 minor version number.
1120 */
1121 mnt->version = 4;
1122 break;
1123 case Opt_vers_4_0:
1124 mnt->version = 4;
1125 mnt->minorversion = 0;
1126 break;
1127 case Opt_vers_4_1:
1128 mnt->version = 4;
1129 mnt->minorversion = 1;
1130 break;
1131 default:
1132 return 0;
1133 }
1134 return 1;
1135}
1136
c5cb09b6
RL		 1137static int nfs_get_option_str(substring_t args[], char **option)
1138{
1139 kfree(*option);
1140 *option = match_strdup(args);
1141 return !option;
1142}
1143
1144static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1145{
1146 int rc;
1147 char *string;
1148
1149 string = match_strdup(args);
1150 if (string == NULL)
1151 return -ENOMEM;
1152 rc = strict_strtoul(string, 10, option);
1153 kfree(string);
1154
1155 return rc;
1156}
1157
bf0fd768
CL		 1158/*
1159 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1160 * a data structure. The whole mount string is processed; bad options are
1161 * skipped as they are encountered. If there were no errors, return 1;
1162 * otherwise return 0 (zero).
bf0fd768
CL		 1163 */
1164static int nfs_parse_mount_options(char *raw,
1165 struct nfs_parsed_mount_data *mnt)
1166{
f9c3a380 1167 char *p, *string, *secdata;
d23c45fd 1168 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1169 unsigned short protofamily = AF_UNSPEC;
1170 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1171
1172 if (!raw) {
1173 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1174 return 1;
1175 }
1176 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1177
f9c3a380
EP		 1178 secdata = alloc_secdata();
1179 if (!secdata)
1180 goto out_nomem;
1181
1182 rc = security_sb_copy_data(raw, secdata);
1183 if (rc)
1184 goto out_security_failure;
1185
1186 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1187 if (rc)
1188 goto out_security_failure;
1189
1190 free_secdata(secdata);
1191
bf0fd768
CL		 1192 while ((p = strsep(&raw, ",")) != NULL) {
1193 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1194 unsigned long option;
1195 int token;
bf0fd768
CL		 1196
1197 if (!*p)
1198 continue;
1199
1200 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1201
1202 token = match_token(p, nfs_mount_option_tokens, args);
1203 switch (token) {
f45663ce
CL		 1204
1205 /*
1206 * boolean options: foo/nofoo
1207 */
bf0fd768
CL		 1208 case Opt_soft:
1209 mnt->flags |= NFS_MOUNT_SOFT;
1210 break;
1211 case Opt_hard:
1212 mnt->flags &= ~NFS_MOUNT_SOFT;
1213 break;
bf0fd768
CL		 1214 case Opt_posix:
1215 mnt->flags |= NFS_MOUNT_POSIX;
1216 break;
1217 case Opt_noposix:
1218 mnt->flags &= ~NFS_MOUNT_POSIX;
1219 break;
1220 case Opt_cto:
1221 mnt->flags &= ~NFS_MOUNT_NOCTO;
1222 break;
1223 case Opt_nocto:
1224 mnt->flags |= NFS_MOUNT_NOCTO;
1225 break;
1226 case Opt_ac:
1227 mnt->flags &= ~NFS_MOUNT_NOAC;
1228 break;
1229 case Opt_noac:
1230 mnt->flags |= NFS_MOUNT_NOAC;
1231 break;
1232 case Opt_lock:
1233 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1234 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1235 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1236 break;
1237 case Opt_nolock:
1238 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1239 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1240 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1241 break;
bf0fd768
CL		 1242 case Opt_udp:
1243 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1244 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1245 break;
1246 case Opt_tcp:
1247 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1248 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1249 break;
2cf7ff7a
TT		 1250 case Opt_rdma:
1251 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1252 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1253 xprt_load_transport(p);
2cf7ff7a 1254 break;
bf0fd768
CL		 1255 case Opt_acl:
1256 mnt->flags &= ~NFS_MOUNT_NOACL;
1257 break;
1258 case Opt_noacl:
1259 mnt->flags |= NFS_MOUNT_NOACL;
1260 break;
1261 case Opt_rdirplus:
1262 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1263 break;
1264 case Opt_nordirplus:
1265 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1266 break;
75180df2
TM		 1267 case Opt_sharecache:
1268 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1269 break;
1270 case Opt_nosharecache:
1271 mnt->flags |= NFS_MOUNT_UNSHARED;
1272 break;
d740351b
CL		 1273 case Opt_resvport:
1274 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1275 break;
1276 case Opt_noresvport:
1277 mnt->flags |= NFS_MOUNT_NORESVPORT;
1278 break;
b797cac7
DH		 1279 case Opt_fscache:
1280 mnt->options |= NFS_OPTION_FSCACHE;
1281 kfree(mnt->fscache_uniq);
1282 mnt->fscache_uniq = NULL;
1283 break;
1284 case Opt_nofscache:
1285 mnt->options &= ~NFS_OPTION_FSCACHE;
1286 kfree(mnt->fscache_uniq);
1287 mnt->fscache_uniq = NULL;
1288 break;
bf0fd768 1289
f45663ce
CL		 1290 /*
1291 * options that take numeric values
1292 */
bf0fd768 1293 case Opt_port:
c5cb09b6
RL		 1294 if (nfs_get_option_ul(args, &option) ||
1295 option > USHRT_MAX)
d23c45fd
CL		 1296 goto out_invalid_value;
1297 mnt->nfs_server.port = option;
bf0fd768
CL		 1298 break;
1299 case Opt_rsize:
c5cb09b6 1300 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1301 goto out_invalid_value;
1302 mnt->rsize = option;
bf0fd768
CL		 1303 break;
1304 case Opt_wsize:
c5cb09b6 1305 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1306 goto out_invalid_value;
1307 mnt->wsize = option;
bf0fd768
CL		 1308 break;
1309 case Opt_bsize:
c5cb09b6 1310 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1311 goto out_invalid_value;
1312 mnt->bsize = option;
bf0fd768
CL		 1313 break;
1314 case Opt_timeo:
c5cb09b6 1315 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1316 goto out_invalid_value;
1317 mnt->timeo = option;
bf0fd768
CL		 1318 break;
1319 case Opt_retrans:
c5cb09b6 1320 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1321 goto out_invalid_value;
1322 mnt->retrans = option;
bf0fd768
CL		 1323 break;
1324 case Opt_acregmin:
c5cb09b6 1325 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1326 goto out_invalid_value;
1327 mnt->acregmin = option;
bf0fd768
CL		 1328 break;
1329 case Opt_acregmax:
c5cb09b6 1330 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1331 goto out_invalid_value;
1332 mnt->acregmax = option;
bf0fd768
CL		 1333 break;
1334 case Opt_acdirmin:
c5cb09b6 1335 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1336 goto out_invalid_value;
1337 mnt->acdirmin = option;
bf0fd768
CL		 1338 break;
1339 case Opt_acdirmax:
c5cb09b6 1340 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1341 goto out_invalid_value;
1342 mnt->acdirmax = option;
bf0fd768
CL		 1343 break;
1344 case Opt_actimeo:
c5cb09b6 1345 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1346 goto out_invalid_value;
1347 mnt->acregmin = mnt->acregmax =
1348 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1349 break;
1350 case Opt_namelen:
c5cb09b6 1351 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1352 goto out_invalid_value;
1353 mnt->namlen = option;
bf0fd768
CL		 1354 break;
1355 case Opt_mountport:
c5cb09b6
RL		 1356 if (nfs_get_option_ul(args, &option) ||
1357 option > USHRT_MAX)
d23c45fd
CL		 1358 goto out_invalid_value;
1359 mnt->mount_server.port = option;
bf0fd768 1360 break;
bf0fd768 1361 case Opt_mountvers:
c5cb09b6 1362 if (nfs_get_option_ul(args, &option) ||
f45663ce 1363 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1364 option > NFS_MNT3_VERSION)
1365 goto out_invalid_value;
1366 mnt->mount_server.version = option;
bf0fd768 1367 break;
3fd5be9e 1368 case Opt_minorversion:
c5cb09b6 1369 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1370 goto out_invalid_value;
1371 if (option > NFS4_MAX_MINOR_VERSION)
1372 goto out_invalid_value;
1373 mnt->minorversion = option;
3fd5be9e 1374 break;
bf0fd768 1375
f45663ce
CL		 1376 /*
1377 * options that take text values
1378 */
0d71b058
TM		 1379 case Opt_nfsvers:
1380 string = match_strdup(args);
1381 if (string == NULL)
1382 goto out_nomem;
1383 rc = nfs_parse_version_string(string, mnt, args);
1384 kfree(string);
1385 if (!rc)
1386 goto out_invalid_value;
1387 break;
bf0fd768
CL		 1388 case Opt_sec:
1389 string = match_strdup(args);
1390 if (string == NULL)
1391 goto out_nomem;
01060c89 1392 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1393 kfree(string);
f45663ce 1394 if (!rc) {
f45663ce
CL		 1395 dfprintk(MOUNT, "NFS: unrecognized "
1396 "security flavor\n");
d23c45fd 1397 return 0;
f45663ce 1398 }
bf0fd768
CL		 1399 break;
1400 case Opt_proto:
1401 string = match_strdup(args);
1402 if (string == NULL)
1403 goto out_nomem;
1404 token = match_token(string,
1405 nfs_xprt_protocol_tokens, args);
bf0fd768 1406
ee671b01 1407 protofamily = AF_INET;
bf0fd768 1408 switch (token) {
ee671b01
JL		 1409 case Opt_xprt_udp6:
1410 protofamily = AF_INET6;
fdb66ff4 1411 case Opt_xprt_udp:
bf0fd768 1412 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1413 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1414 break;
ee671b01
JL		 1415 case Opt_xprt_tcp6:
1416 protofamily = AF_INET6;
fdb66ff4 1417 case Opt_xprt_tcp:
bf0fd768 1418 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1419 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1420 break;
2cf7ff7a
TT		 1421 case Opt_xprt_rdma:
1422 /* vector side protocols to TCP */
1423 mnt->flags |= NFS_MOUNT_TCP;
1424 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1425 xprt_load_transport(string);
2cf7ff7a 1426 break;
bf0fd768 1427 default:
f45663ce
CL		 1428 dfprintk(MOUNT, "NFS: unrecognized "
1429 "transport protocol\n");
4223a4a1 1430 kfree(string);
d23c45fd 1431 return 0;
bf0fd768 1432 }
c5cb09b6 1433 kfree(string);
bf0fd768
CL		 1434 break;
1435 case Opt_mountproto:
1436 string = match_strdup(args);
1437 if (string == NULL)
1438 goto out_nomem;
1439 token = match_token(string,
1440 nfs_xprt_protocol_tokens, args);
d508afb4 1441 kfree(string);
bf0fd768 1442
ee671b01 1443 mountfamily = AF_INET;
bf0fd768 1444 switch (token) {
ee671b01
JL		 1445 case Opt_xprt_udp6:
1446 mountfamily = AF_INET6;
fdb66ff4 1447 case Opt_xprt_udp:
0896a725 1448 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1449 break;
ee671b01
JL		 1450 case Opt_xprt_tcp6:
1451 mountfamily = AF_INET6;
fdb66ff4 1452 case Opt_xprt_tcp:
0896a725 1453 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1454 break;
2cf7ff7a 1455 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1456 default:
f45663ce
CL		 1457 dfprintk(MOUNT, "NFS: unrecognized "
1458 "transport protocol\n");
d23c45fd 1459 return 0;
bf0fd768
CL		 1460 }
1461 break;
1462 case Opt_addr:
1463 string = match_strdup(args);
1464 if (string == NULL)
1465 goto out_nomem;
53a0b9c4 1466 mnt->nfs_server.addrlen =
b48e1278 1467 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1468 (struct sockaddr *)
1469 &mnt->nfs_server.address,
1470 sizeof(mnt->nfs_server.address));
bf0fd768 1471 kfree(string);
53a0b9c4
CL		 1472 if (mnt->nfs_server.addrlen == 0)
1473 goto out_invalid_address;
bf0fd768
CL		 1474 break;
1475 case Opt_clientaddr:
c5cb09b6 1476 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1477 goto out_nomem;
bf0fd768 1478 break;
33832034 1479 case Opt_mounthost:
c5cb09b6
RL		 1480 if (nfs_get_option_str(args,
1481 &mnt->mount_server.hostname))
33832034 1482 goto out_nomem;
33832034 1483 break;
0ac83779 1484 case Opt_mountaddr:
bf0fd768
CL		 1485 string = match_strdup(args);
1486 if (string == NULL)
1487 goto out_nomem;
53a0b9c4 1488 mnt->mount_server.addrlen =
b48e1278 1489 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1490 (struct sockaddr *)
1491 &mnt->mount_server.address,
1492 sizeof(mnt->mount_server.address));
bf0fd768 1493 kfree(string);
53a0b9c4
CL		 1494 if (mnt->mount_server.addrlen == 0)
1495 goto out_invalid_address;
bf0fd768 1496 break;
7973c1f1
TM		 1497 case Opt_lookupcache:
1498 string = match_strdup(args);
1499 if (string == NULL)
1500 goto out_nomem;
1501 token = match_token(string,
1502 nfs_lookupcache_tokens, args);
1503 kfree(string);
1504 switch (token) {
1505 case Opt_lookupcache_all:
1506 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1507 break;
1508 case Opt_lookupcache_positive:
1509 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1510 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1511 break;
1512 case Opt_lookupcache_none:
1513 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1514 break;
1515 default:
7973c1f1
TM		 1516 dfprintk(MOUNT, "NFS: invalid "
1517 "lookupcache argument\n");
d23c45fd 1518 return 0;
7973c1f1
TM		 1519 };
1520 break;
a6d5ff64 1521 case Opt_fscache_uniq:
c5cb09b6 1522 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1523 goto out_nomem;
a6d5ff64
CL		 1524 mnt->options |= NFS_OPTION_FSCACHE;
1525 break;
5eebde23
SJ		 1526 case Opt_local_lock:
1527 string = match_strdup(args);
1528 if (string == NULL)
1529 goto out_nomem;
1530 token = match_token(string, nfs_local_lock_tokens,
1531 args);
1532 kfree(string);
1533 switch (token) {
1534 case Opt_local_lock_all:
1535 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1536 NFS_MOUNT_LOCAL_FCNTL);
1537 break;
1538 case Opt_local_lock_flock:
1539 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1540 break;
1541 case Opt_local_lock_posix:
1542 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1543 break;
1544 case Opt_local_lock_none:
1545 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1546 NFS_MOUNT_LOCAL_FCNTL);
1547 break;
1548 default:
1549 dfprintk(MOUNT, "NFS: invalid "
1550 "local_lock argument\n");
1551 return 0;
1552 };
1553 break;
bf0fd768 1554
f45663ce
CL		 1555 /*
1556 * Special options
1557 */
1558 case Opt_sloppy:
1559 sloppy = 1;
1560 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1561 break;
bf0fd768
CL		 1562 case Opt_userspace:
1563 case Opt_deprecated:
d33e4dfe
CL		 1564 dfprintk(MOUNT, "NFS: ignoring mount option "
1565 "'%s'\n", p);
bf0fd768
CL		 1566 break;
1567
1568 default:
d23c45fd 1569 invalid_option = 1;
f45663ce
CL		 1570 dfprintk(MOUNT, "NFS: unrecognized mount option "
1571 "'%s'\n", p);
bf0fd768
CL		 1572 }
1573 }
1574
d23c45fd
CL		 1575 if (!sloppy && invalid_option)
1576 return 0;
1577
571b7554
WAA		 1578 if (mnt->minorversion && mnt->version != 4)
1579 goto out_minorversion_mismatch;
1580
ee671b01
JL		 1581 /*
1582 * verify that any proto=/mountproto= options match the address
1583 * familiies in the addr=/mountaddr= options.
1584 */
1585 if (protofamily != AF_UNSPEC &&
1586 protofamily != mnt->nfs_server.address.ss_family)
1587 goto out_proto_mismatch;
1588
1589 if (mountfamily != AF_UNSPEC) {
1590 if (mnt->mount_server.addrlen) {
1591 if (mountfamily != mnt->mount_server.address.ss_family)
1592 goto out_mountproto_mismatch;
1593 } else {
1594 if (mountfamily != mnt->nfs_server.address.ss_family)
1595 goto out_mountproto_mismatch;
1596 }
1597 }
1598
bf0fd768
CL		 1599 return 1;
1600
ee671b01
JL		 1601out_mountproto_mismatch:
1602 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1603 "option\n");
1604 return 0;
1605out_proto_mismatch:
1606 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1607 return 0;
53a0b9c4
CL		 1608out_invalid_address:
1609 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1610 return 0;
d23c45fd 1611out_invalid_value:
53a0b9c4 1612 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1613 return 0;
571b7554
WAA		 1614out_minorversion_mismatch:
1615 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1616 "minorversion=%u\n", mnt->version, mnt->minorversion);
1617 return 0;
bf0fd768
CL		 1618out_nomem:
1619 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1620 return 0;
f9c3a380
EP		 1621out_security_failure:
1622 free_secdata(secdata);
1623 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1624 return 0;
bf0fd768
CL		 1625}
1626
ec88f28d
CL		 1627/*
1628 * Match the requested auth flavors with the list returned by
1629 * the server. Returns zero and sets the mount's authentication
1630 * flavor on success; returns -EACCES if server does not support
1631 * the requested flavor.
1632 */
1633static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1634 struct nfs_mount_request *request)
1635{
1636 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1637
5eecfde6
CL		 1638 /*
1639 * Certain releases of Linux's mountd return an empty
1640 * flavor list. To prevent behavioral regression with
1641 * these servers (ie. rejecting mounts that used to
1642 * succeed), revert to pre-2.6.32 behavior (no checking)
1643 * if the returned flavor list is empty.
1644 */
1645 if (server_authlist_len == 0)
1646 return 0;
1647
ec88f28d
CL		 1648 /*
1649 * We avoid sophisticated negotiating here, as there are
1650 * plenty of cases where we can get it wrong, providing
1651 * either too little or too much security.
1652 *
1653 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1654 * flavor listed first. However, some servers list
1655 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1656 * preferred default, in args->auth_flavors[0] if user
1657 * didn't specify sec= mount option.
1658 */
1659 for (i = 0; i < args->auth_flavor_len; i++)
1660 for (j = 0; j < server_authlist_len; j++)
1661 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1662 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1663 request->auth_flavs[j]);
1664 args->auth_flavors[0] = request->auth_flavs[j];
1665 return 0;
1666 }
1667
1668 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1669 nfs_umount(request);
1670 return -EACCES;
1671}
1672
0076d7b7
CL		 1673/*
1674 * Use the remote server's MOUNT service to request the NFS file handle
1675 * corresponding to the provided path.
1676 */
1677static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1678 struct nfs_fh *root_fh)
1679{
ec88f28d
CL		 1680 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1681 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1682 struct nfs_mount_request request = {
1683 .sap = (struct sockaddr *)
1684 &args->mount_server.address,
1685 .dirpath = args->nfs_server.export_path,
1686 .protocol = args->mount_server.protocol,
1687 .fh = root_fh,
50a737f8 1688 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1689 .auth_flav_len = &server_authlist_len,
1690 .auth_flavs = server_authlist,
6d59b8d5 1691 .net = args->net,
c5d120f8 1692 };
4c568017 1693 int status;
0076d7b7
CL		 1694
1695 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1696 switch (args->version) {
1697 default:
1698 args->mount_server.version = NFS_MNT3_VERSION;
1699 break;
1700 case 2:
1701 args->mount_server.version = NFS_MNT_VERSION;
1702 }
0076d7b7 1703 }
c5d120f8 1704 request.version = args->mount_server.version;
0076d7b7 1705
33832034 1706 if (args->mount_server.hostname)
c5d120f8 1707 request.hostname = args->mount_server.hostname;
33832034 1708 else
c5d120f8 1709 request.hostname = args->nfs_server.hostname;
33832034 1710
0076d7b7
CL		 1711 /*
1712 * Construct the mount server's address.
1713 */
4c568017 1714 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1715 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1716 args->nfs_server.addrlen);
1717 args->mount_server.addrlen = args->nfs_server.addrlen;
1718 }
c5d120f8 1719 request.salen = args->mount_server.addrlen;
f5855fec 1720 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1721
1722 /*
1723 * Now ask the mount server to map our export path
1724 * to a file handle.
1725 */
c5d120f8 1726 status = nfs_mount(&request);
ec88f28d
CL		 1727 if (status != 0) {
1728 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1729 request.hostname, status);
1730 return status;
1731 }
0076d7b7 1732
ec88f28d
CL		 1733 /*
1734 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1735 */
1736 if (args->mount_server.version != NFS_MNT3_VERSION)
1737 return 0;
1738 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1739}
1740
c12bacec
RL		 1741/*
1742 * Split "dev_name" into "hostname:export_path".
1743 *
1744 * The leftmost colon demarks the split between the server's hostname
1745 * and the export path. If the hostname starts with a left square
1746 * bracket, then it may contain colons.
1747 *
1748 * Note: caller frees hostname and export path, even on error.
1749 */
1750static int nfs_parse_devname(const char *dev_name,
1751 char **hostname, size_t maxnamlen,
1752 char **export_path, size_t maxpathlen)
dc045898
CL		 1753{
1754 size_t len;
c12bacec 1755 char *end;
dc045898 1756
c12bacec
RL		 1757 /* Is the host name protected with square brakcets? */
1758 if (*dev_name == '[') {
1759 end = strchr(++dev_name, ']');
1760 if (end == NULL || end[1] != ':')
dc045898 1761 goto out_bad_devname;
dc045898 1762
c12bacec
RL		 1763 len = end - dev_name;
1764 end++;
1765 } else {
1766 char *comma;
dc045898 1767
c12bacec
RL		 1768 end = strchr(dev_name, ':');
1769 if (end == NULL)
1770 goto out_bad_devname;
1771 len = end - dev_name;
d1aa0825 1772
c12bacec
RL		 1773 /* kill possible hostname list: not supported */
1774 comma = strchr(dev_name, ',');
1775 if (comma != NULL && comma < end)
1776 *comma = 0;
1777 }
d1aa0825 1778
d1aa0825
CL		 1779 if (len > maxnamlen)
1780 goto out_hostname;
1781
1782 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1783 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1784 if (*hostname == NULL)
1785 goto out_nomem;
c12bacec 1786 len = strlen(++end);
d1aa0825
CL		 1787 if (len > maxpathlen)
1788 goto out_path;
1789 *export_path = kstrndup(end, len, GFP_KERNEL);
1790 if (!*export_path)
1791 goto out_nomem;
1792
c12bacec 1793 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1794 return 0;
1795
1796out_bad_devname:
1797 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1798 return -EINVAL;
1799
1800out_nomem:
1801 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1802 return -ENOMEM;
1803
1804out_hostname:
1805 dfprintk(MOUNT, "NFS: server hostname too long\n");
1806 return -ENAMETOOLONG;
1807
1808out_path:
1809 dfprintk(MOUNT, "NFS: export pathname too long\n");
1810 return -ENAMETOOLONG;
1811}
1812
f7b422b1 1813/*
54ceac45
DH		 1814 * Validate the NFS2/NFS3 mount data
1815 * - fills in the mount root filehandle
136d558c
CL		 1816 *
1817 * For option strings, user space handles the following behaviors:
1818 *
1819 * + DNS: mapping server host name to IP address ("addr=" option)
1820 *
1821 * + failure mode: how to behave if a mount request can't be handled
1822 * immediately ("fg/bg" option)
1823 *
1824 * + retry: how often to retry a mount request ("retry=" option)
1825 *
1826 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1827 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1828 */
2283f8d6
TT		 1829static int nfs_validate_mount_data(void *options,
1830 struct nfs_parsed_mount_data *args,
136d558c
CL		 1831 struct nfs_fh *mntfh,
1832 const char *dev_name)
f7b422b1 1833{
2283f8d6 1834 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1835 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1836
5df36e78
CL		 1837 if (data == NULL)
1838 goto out_no_data;
f7b422b1 1839
54ceac45 1840 switch (data->version) {
5df36e78
CL		 1841 case 1:
1842 data->namlen = 0;
1843 case 2:
1844 data->bsize = 0;
1845 case 3:
1846 if (data->flags & NFS_MOUNT_VER3)
1847 goto out_no_v3;
1848 data->root.size = NFS2_FHSIZE;
1849 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1850 case 4:
1851 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1852 goto out_no_sec;
1853 case 5:
1854 memset(data->context, 0, sizeof(data->context));
1855 case 6:
b7e24457
TM		 1856 if (data->flags & NFS_MOUNT_VER3) {
1857 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1858 goto out_invalid_fh;
5df36e78 1859 mntfh->size = data->root.size;
764302cc
CL		 1860 args->version = 3;
1861 } else {
5df36e78 1862 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1863 args->version = 2;
1864 }
5df36e78 1865
5df36e78
CL		 1866
1867 memcpy(mntfh->data, data->root.data, mntfh->size);
1868 if (mntfh->size < sizeof(mntfh->data))
1869 memset(mntfh->data + mntfh->size, 0,
1870 sizeof(mntfh->data) - mntfh->size);
6e88e061 1871
2283f8d6
TT		 1872 /*
1873 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1874 * can deal with.
1875 */
ff3525a5 1876 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1877 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1878 args->rsize = data->rsize;
1879 args->wsize = data->wsize;
2283f8d6
TT		 1880 args->timeo = data->timeo;
1881 args->retrans = data->retrans;
1882 args->acregmin = data->acregmin;
1883 args->acregmax = data->acregmax;
1884 args->acdirmin = data->acdirmin;
1885 args->acdirmax = data->acdirmax;
4c568017 1886
4cfd74fc 1887 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1888 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1889 if (!nfs_verify_server_address(sap))
4c568017
CL		 1890 goto out_no_address;
1891
2283f8d6 1892 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1893 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1894 /* N.B. caller will free nfs_server.hostname in all cases */
1895 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1896 args->namlen = data->namlen;
1897 args->bsize = data->bsize;
dd07c947
CL		 1898
1899 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1900 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1901 if (!args->nfs_server.hostname)
1902 goto out_nomem;
f9c3a380 1903
5eebde23
SJ		 1904 if (!(data->flags & NFS_MOUNT_NONLM))
1905 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1906 NFS_MOUNT_LOCAL_FCNTL);
1907 else
1908 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1909 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1910 /*
1911 * The legacy version 6 binary mount data from userspace has a
1912 * field used only to transport selinux information into the
1913 * the kernel. To continue to support that functionality we
1914 * have a touch of selinux knowledge here in the NFS code. The
1915 * userspace code converted context=blah to just blah so we are
1916 * converting back to the full string selinux understands.
1917 */
1918 if (data->context[0]){
1919#ifdef CONFIG_SECURITY_SELINUX
1920 int rc;
1921 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1922 if (!opts_str)
1923 return -ENOMEM;
1924 strcpy(opts_str, "context=");
1925 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1926 strcat(opts_str, &data->context[0]);
1927 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1928 kfree(opts_str);
1929 if (rc)
1930 return rc;
1931#else
1932 return -EINVAL;
1933#endif
1934 }
1935
5df36e78 1936 break;
136d558c 1937 default: {
136d558c 1938 int status;
136d558c 1939
2283f8d6
TT		 1940 if (nfs_parse_mount_options((char *)options, args) == 0)
1941 return -EINVAL;
136d558c 1942
4cfd74fc 1943 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1944 goto out_no_address;
1945
764302cc
CL		 1946 if (args->version == 4)
1947#ifdef CONFIG_NFS_V4
1948 return nfs4_validate_text_mount_data(options,
1949 args, dev_name);
1950#else
1951 goto out_v4_not_compiled;
1952#endif
1953
f5855fec 1954 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1955
259875ef
TM		 1956 nfs_set_mount_transport_protocol(args);
1957
dc045898
CL		 1958 status = nfs_parse_devname(dev_name,
1959 &args->nfs_server.hostname,
1960 PAGE_SIZE,
1961 &args->nfs_server.export_path,
1962 NFS_MAXPATHLEN);
1963 if (!status)
1964 status = nfs_try_mount(args, mntfh);
136d558c 1965
dc045898
CL		 1966 kfree(args->nfs_server.export_path);
1967 args->nfs_server.export_path = NULL;
136d558c 1968
136d558c 1969 if (status)
fdc6e2c8 1970 return status;
136d558c 1971
136d558c
CL		 1972 break;
1973 }
f7b422b1 1974 }
54ceac45
DH		 1975
1976#ifndef CONFIG_NFS_V3
8a6e5deb 1977 if (args->version == 3)
5df36e78
CL		 1978 goto out_v3_not_compiled;
1979#endif /* !CONFIG_NFS_V3 */
f7b422b1 1980
5df36e78 1981 return 0;
f7b422b1 1982
5df36e78
CL		 1983out_no_data:
1984 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1985 return -EINVAL;
54ceac45 1986
5df36e78
CL		 1987out_no_v3:
1988 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1989 data->version);
1990 return -EINVAL;
f7b422b1 1991
5df36e78
CL		 1992out_no_sec:
1993 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1994 return -EINVAL;
1995
5df36e78
CL		 1996#ifndef CONFIG_NFS_V3
1997out_v3_not_compiled:
1998 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1999 return -EPROTONOSUPPORT;
2000#endif /* !CONFIG_NFS_V3 */
2001
764302cc
CL		 2002#ifndef CONFIG_NFS_V4
2003out_v4_not_compiled:
2004 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2005 return -EPROTONOSUPPORT;
2006#endif /* !CONFIG_NFS_V4 */
2007
63649bd7
CG		 2008out_nomem:
2009 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2010 return -ENOMEM;
2011
5df36e78
CL		 2012out_no_address:
2013 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2014 return -EINVAL;
2015
2016out_invalid_fh:
2017 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2018 return -EINVAL;
f7b422b1
DH		 2019}
2020
48b605f8
JL		 2021static int
2022nfs_compare_remount_data(struct nfs_server *nfss,
2023 struct nfs_parsed_mount_data *data)
2024{
2025 if (data->flags != nfss->flags ||
2026 data->rsize != nfss->rsize ||
2027 data->wsize != nfss->wsize ||
2028 data->retrans != nfss->client->cl_timeout->to_retries ||
2029 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2030 data->acregmin != nfss->acregmin / HZ ||
2031 data->acregmax != nfss->acregmax / HZ ||
2032 data->acdirmin != nfss->acdirmin / HZ ||
2033 data->acdirmax != nfss->acdirmax / HZ ||
2034 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2035 data->nfs_server.port != nfss->port ||
48b605f8 2036 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2037 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2038 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2039 return -EINVAL;
2040
2041 return 0;
2042}
2043
2044static int
2045nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2046{
2047 int error;
2048 struct nfs_server *nfss = sb->s_fs_info;
2049 struct nfs_parsed_mount_data *data;
2050 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2051 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2052 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2053
2054 /*
2055 * Userspace mount programs that send binary options generally send
2056 * them populated with default values. We have no way to know which
2057 * ones were explicitly specified. Fall back to legacy behavior and
2058 * just return success.
2059 */
31c94469
MZ		 2060 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2061 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2062 options->version <= 6))))
48b605f8
JL		 2063 return 0;
2064
2065 data = kzalloc(sizeof(*data), GFP_KERNEL);
2066 if (data == NULL)
2067 return -ENOMEM;
2068
2069 /* fill out struct with values from existing mount */
2070 data->flags = nfss->flags;
2071 data->rsize = nfss->rsize;
2072 data->wsize = nfss->wsize;
2073 data->retrans = nfss->client->cl_timeout->to_retries;
2074 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2075 data->acregmin = nfss->acregmin / HZ;
2076 data->acregmax = nfss->acregmax / HZ;
2077 data->acdirmin = nfss->acdirmin / HZ;
2078 data->acdirmax = nfss->acdirmax / HZ;
2079 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2080 data->nfs_server.port = nfss->port;
48b605f8
JL		 2081 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2082 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2083 data->nfs_server.addrlen);
2084
2085 /* overwrite those values with any that were specified */
2086 error = nfs_parse_mount_options((char *)options, data);
2087 if (error < 0)
2088 goto out;
2089
26c4c170
JL		 2090 /*
2091 * noac is a special case. It implies -o sync, but that's not
2092 * necessarily reflected in the mtab options. do_remount_sb
2093 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2094 * remount options, so we have to explicitly reset it.
2095 */
2096 if (data->flags & NFS_MOUNT_NOAC)
2097 *flags |= MS_SYNCHRONOUS;
2098
48b605f8
JL		 2099 /* compare new mount options with old ones */
2100 error = nfs_compare_remount_data(nfss, data);
2101out:
2102 kfree(data);
2103 return error;
2104}
2105
f7b422b1 2106/*
54ceac45 2107 * Initialise the common bits of the superblock
f7b422b1 2108 */
54ceac45 2109static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2110{
54ceac45 2111 struct nfs_server *server = NFS_SB(sb);
5006a76c 2112
54ceac45 2113 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2114
54ceac45
DH		 2115 /* We probably want something more informative here */
2116 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2117 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2118
54ceac45
DH		 2119 if (sb->s_blocksize == 0)
2120 sb->s_blocksize = nfs_block_bits(server->wsize,
2121 &sb->s_blocksize_bits);
f7b422b1 2122
32a88aa1
JA		 2123 sb->s_bdi = &server->backing_dev_info;
2124
54ceac45 2125 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2126}
2127
2128/*
54ceac45 2129 * Finish setting up an NFS2/3 superblock
f7b422b1 2130 */
2283f8d6
TT		 2131static void nfs_fill_super(struct super_block *sb,
2132 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2133{
2134 struct nfs_server *server = NFS_SB(sb);
5006a76c 2135
54ceac45
DH		 2136 sb->s_blocksize_bits = 0;
2137 sb->s_blocksize = 0;
2138 if (data->bsize)
2139 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2140
8a6e5deb 2141 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2142 /* The VFS shouldn't apply the umask to mode bits. We will do
2143 * so ourselves when necessary.
2144 */
2145 sb->s_flags |= MS_POSIXACL;
2146 sb->s_time_gran = 1;
816724e6 2147 }
54ceac45
DH		 2148
2149 sb->s_op = &nfs_sops;
2150 nfs_initialise_sb(sb);
f7b422b1
DH		 2151}
2152
2153/*
54ceac45 2154 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2155 */
54ceac45
DH		 2156static void nfs_clone_super(struct super_block *sb,
2157 const struct super_block *old_sb)
f7b422b1 2158{
54ceac45
DH		 2159 struct nfs_server *server = NFS_SB(sb);
2160
2161 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2162 sb->s_blocksize = old_sb->s_blocksize;
2163 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2164
8a6e5deb 2165 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2166 /* The VFS shouldn't apply the umask to mode bits. We will do
2167 * so ourselves when necessary.
f7b422b1
DH		 2168 */
2169 sb->s_flags |= MS_POSIXACL;
f7b422b1 2170 sb->s_time_gran = 1;
f7b422b1
DH		 2171 }
2172
54ceac45
DH		 2173 sb->s_op = old_sb->s_op;
2174 nfs_initialise_sb(sb);
f7b422b1
DH		 2175}
2176
275a5d24
TM		 2177static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2178{
2179 const struct nfs_server *a = s->s_fs_info;
2180 const struct rpc_clnt *clnt_a = a->client;
2181 const struct rpc_clnt *clnt_b = b->client;
2182
2183 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2184 goto Ebusy;
2185 if (a->nfs_client != b->nfs_client)
2186 goto Ebusy;
2187 if (a->flags != b->flags)
2188 goto Ebusy;
2189 if (a->wsize != b->wsize)
2190 goto Ebusy;
2191 if (a->rsize != b->rsize)
2192 goto Ebusy;
2193 if (a->acregmin != b->acregmin)
2194 goto Ebusy;
2195 if (a->acregmax != b->acregmax)
2196 goto Ebusy;
2197 if (a->acdirmin != b->acdirmin)
2198 goto Ebusy;
2199 if (a->acdirmax != b->acdirmax)
2200 goto Ebusy;
2201 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2202 goto Ebusy;
e89a5a43 2203 return 1;
275a5d24 2204Ebusy:
e89a5a43
TM		 2205 return 0;
2206}
2207
2208struct nfs_sb_mountdata {
2209 struct nfs_server *server;
2210 int mntflags;
2211};
2212
2213static int nfs_set_super(struct super_block *s, void *data)
2214{
2215 struct nfs_sb_mountdata *sb_mntdata = data;
2216 struct nfs_server *server = sb_mntdata->server;
2217 int ret;
2218
2219 s->s_flags = sb_mntdata->mntflags;
2220 s->s_fs_info = server;
8b244ff2 2221 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2222 ret = set_anon_super(s, server);
2223 if (ret == 0)
2224 server->s_dev = s->s_dev;
2225 return ret;
2226}
2227
fd00a8ff
CL		 2228static int nfs_compare_super_address(struct nfs_server *server1,
2229 struct nfs_server *server2)
2230{
2231 struct sockaddr *sap1, *sap2;
2232
2233 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2234 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2235
2236 if (sap1->sa_family != sap2->sa_family)
2237 return 0;
2238
2239 switch (sap1->sa_family) {
2240 case AF_INET: {
2241 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2242 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2243 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2244 return 0;
2245 if (sin1->sin_port != sin2->sin_port)
2246 return 0;
2247 break;
2248 }
2249 case AF_INET6: {
2250 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2251 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2252 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2253 return 0;
2254 if (sin1->sin6_port != sin2->sin6_port)
2255 return 0;
2256 break;
2257 }
2258 default:
2259 return 0;
2260 }
2261
2262 return 1;
2263}
2264
e89a5a43
TM		 2265static int nfs_compare_super(struct super_block *sb, void *data)
2266{
2267 struct nfs_sb_mountdata *sb_mntdata = data;
2268 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2269 int mntflags = sb_mntdata->mntflags;
2270
fd00a8ff 2271 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2272 return 0;
2273 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2274 if (old->flags & NFS_MOUNT_UNSHARED)
2275 return 0;
2276 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2277 return 0;
2278 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2279}
2280
2311b943
BS		 2281static void nfs_get_cache_cookie(struct super_block *sb,
2282 struct nfs_parsed_mount_data *parsed,
2283 struct nfs_clone_mount *cloned)
2284{
2285 char *uniq = NULL;
2286 int ulen = 0;
2287
2288 if (parsed && parsed->fscache_uniq) {
2289 uniq = parsed->fscache_uniq;
2290 ulen = strlen(parsed->fscache_uniq);
2291 } else if (cloned) {
2292 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2293 if (mnt_s->fscache_key) {
2294 uniq = mnt_s->fscache_key->key.uniquifier;
2295 ulen = mnt_s->fscache_key->key.uniq_len;
2296 };
2297 }
2298
2299 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2300}
2301
fa799759
MS		 2302static int nfs_bdi_register(struct nfs_server *server)
2303{
2304 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2305}
2306
01194981
AV		 2307static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2308 int flags, const char *dev_name, void *raw_data)
f7b422b1 2309{
f7b422b1
DH		 2310 struct nfs_server *server = NULL;
2311 struct super_block *s;
33852a1f
TM		 2312 struct nfs_parsed_mount_data *data;
2313 struct nfs_fh *mntfh;
01194981 2314 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2315 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2316 struct nfs_sb_mountdata sb_mntdata = {
2317 .mntflags = flags,
2318 };
01194981 2319 int error;
33852a1f 2320
1e657bd5 2321 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2322 mntfh = nfs_alloc_fhandle();
33852a1f 2323 if (data == NULL || mntfh == NULL)
8a0d551a 2324 goto out;
f9c3a380 2325
54ceac45 2326 /* Validate the mount data */
33852a1f 2327 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2328 if (error < 0) {
2329 mntroot = ERR_PTR(error);
0655960f 2330 goto out;
01194981 2331 }
f7b422b1 2332
764302cc
CL		 2333#ifdef CONFIG_NFS_V4
2334 if (data->version == 4) {
01194981 2335 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2336 goto out;
2337 }
2338#endif /* CONFIG_NFS_V4 */
2339
54ceac45 2340 /* Get a volume representation */
33852a1f 2341 server = nfs_create_server(data, mntfh);
54ceac45 2342 if (IS_ERR(server)) {
01194981 2343 mntroot = ERR_CAST(server);
0655960f 2344 goto out;
f7b422b1 2345 }
e89a5a43 2346 sb_mntdata.server = server;
f7b422b1 2347
75180df2
TM		 2348 if (server->flags & NFS_MOUNT_UNSHARED)
2349 compare_super = NULL;
2350
fb2088cc
SP		 2351 /* -o noac implies -o sync */
2352 if (server->flags & NFS_MOUNT_NOAC)
2353 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2354
54ceac45 2355 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2356 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2357 if (IS_ERR(s)) {
01194981 2358 mntroot = ERR_CAST(s);
54ceac45 2359 goto out_err_nosb;
816724e6
TM		 2360 }
2361
54ceac45
DH		 2362 if (s->s_fs_info != server) {
2363 nfs_free_server(server);
2364 server = NULL;
fa799759
MS		 2365 } else {
2366 error = nfs_bdi_register(server);
01194981
AV		 2367 if (error) {
2368 mntroot = ERR_PTR(error);
cfbc0683 2369 goto error_splat_bdi;
01194981 2370 }
54ceac45 2371 }
f7b422b1 2372
54ceac45
DH		 2373 if (!s->s_root) {
2374 /* initial superblock/root creation */
33852a1f 2375 nfs_fill_super(s, data);
2311b943 2376 nfs_get_cache_cookie(s, data, NULL);
54ceac45 2377 }
f7b422b1 2378
0d5839ad 2379 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2380 if (IS_ERR(mntroot))
54ceac45 2381 goto error_splat_super;
816724e6 2382
33852a1f 2383 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2384 if (error)
2385 goto error_splat_root;
2386
54ceac45 2387 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2388
2389out:
8a0d551a 2390 nfs_free_parsed_mount_data(data);
b157b06c 2391 nfs_free_fhandle(mntfh);
01194981 2392 return mntroot;
816724e6 2393
54ceac45
DH		 2394out_err_nosb:
2395 nfs_free_server(server);
0655960f 2396 goto out;
54ceac45 2397
f9c3a380
EP		 2398error_splat_root:
2399 dput(mntroot);
01194981 2400 mntroot = ERR_PTR(error);
54ceac45 2401error_splat_super:
cfbc0683
N		 2402 if (server && !s->s_root)
2403 bdi_unregister(&server->backing_dev_info);
2404error_splat_bdi:
6f5bbff9 2405 deactivate_locked_super(s);
0655960f 2406 goto out;
f7b422b1
DH		 2407}
2408
387c149b
TM		 2409/*
2410 * Ensure that we unregister the bdi before kill_anon_super
2411 * releases the device name
2412 */
2413static void nfs_put_super(struct super_block *s)
2414{
2415 struct nfs_server *server = NFS_SB(s);
2416
2417 bdi_unregister(&server->backing_dev_info);
2418}
2419
54ceac45
DH		 2420/*
2421 * Destroy an NFS2/3 superblock
2422 */
f7b422b1
DH		 2423static void nfs_kill_super(struct super_block *s)
2424{
2425 struct nfs_server *server = NFS_SB(s);
2426
2427 kill_anon_super(s);
08734048 2428 nfs_fscache_release_super_cookie(s);
54ceac45 2429 nfs_free_server(server);
f7b422b1
DH		 2430}
2431
54ceac45
DH		 2432/*
2433 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2434 */
31f43471
AV		 2435static struct dentry *
2436nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2437 const char *dev_name, void *raw_data)
f7b422b1
DH		 2438{
2439 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2440 struct super_block *s;
2441 struct nfs_server *server;
2442 struct dentry *mntroot;
75180df2 2443 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2444 struct nfs_sb_mountdata sb_mntdata = {
2445 .mntflags = flags,
2446 };
54ceac45 2447 int error;
f7b422b1 2448
31f43471 2449 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2450
54ceac45 2451 /* create a new volume representation */
7e6eb683 2452 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2453 if (IS_ERR(server)) {
2454 error = PTR_ERR(server);
2455 goto out_err_noserver;
2456 }
e89a5a43 2457 sb_mntdata.server = server;
8fa5c000 2458
75180df2
TM		 2459 if (server->flags & NFS_MOUNT_UNSHARED)
2460 compare_super = NULL;
2461
fb2088cc
SP		 2462 /* -o noac implies -o sync */
2463 if (server->flags & NFS_MOUNT_NOAC)
2464 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2465
54ceac45 2466 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2467 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2468 if (IS_ERR(s)) {
2469 error = PTR_ERR(s);
2470 goto out_err_nosb;
2471 }
5006a76c 2472
54ceac45
DH		 2473 if (s->s_fs_info != server) {
2474 nfs_free_server(server);
2475 server = NULL;
fa799759
MS		 2476 } else {
2477 error = nfs_bdi_register(server);
2478 if (error)
cfbc0683 2479 goto error_splat_bdi;
f7b422b1 2480 }
24c8dbbb 2481
54ceac45
DH		 2482 if (!s->s_root) {
2483 /* initial superblock/root creation */
54ceac45 2484 nfs_clone_super(s, data->sb);
2311b943 2485 nfs_get_cache_cookie(s, NULL, data);
54ceac45 2486 }
f7b422b1 2487
0d5839ad 2488 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2489 if (IS_ERR(mntroot)) {
2490 error = PTR_ERR(mntroot);
2491 goto error_splat_super;
f7b422b1 2492 }
e9cc6c23 2493 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2494 dput(mntroot);
2495 error = -ESTALE;
2496 goto error_splat_super;
2497 }
f7b422b1 2498
54ceac45 2499 s->s_flags |= MS_ACTIVE;
f7b422b1 2500
f9c3a380
EP		 2501 /* clone any lsm security options from the parent to the new sb */
2502 security_sb_clone_mnt_opts(data->sb, s);
2503
31f43471
AV		 2504 dprintk("<-- nfs_xdev_mount() = 0\n");
2505 return mntroot;
24c8dbbb 2506
54ceac45
DH		 2507out_err_nosb:
2508 nfs_free_server(server);
2509out_err_noserver:
31f43471
AV		 2510 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2511 return ERR_PTR(error);
f7b422b1 2512
54ceac45 2513error_splat_super:
cfbc0683
N		 2514 if (server && !s->s_root)
2515 bdi_unregister(&server->backing_dev_info);
2516error_splat_bdi:
6f5bbff9 2517 deactivate_locked_super(s);
31f43471
AV		 2518 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2519 return ERR_PTR(error);
f7b422b1
DH		 2520}
2521
54ceac45
DH		 2522#ifdef CONFIG_NFS_V4
2523
f7b422b1 2524/*
54ceac45 2525 * Finish setting up a cloned NFS4 superblock
f7b422b1 2526 */
54ceac45
DH		 2527static void nfs4_clone_super(struct super_block *sb,
2528 const struct super_block *old_sb)
f7b422b1 2529{
54ceac45
DH		 2530 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2531 sb->s_blocksize = old_sb->s_blocksize;
2532 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2533 sb->s_time_gran = 1;
54ceac45 2534 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2535 /*
2536 * The VFS shouldn't apply the umask to mode bits. We will do
2537 * so ourselves when necessary.
2538 */
2539 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2540 sb->s_xattr = old_sb->s_xattr;
2541 nfs_initialise_sb(sb);
f7b422b1
DH		 2542}
2543
54ceac45
DH		 2544/*
2545 * Set up an NFS4 superblock
2546 */
2547static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2548{
54ceac45
DH		 2549 sb->s_time_gran = 1;
2550 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2551 /*
2552 * The VFS shouldn't apply the umask to mode bits. We will do
2553 * so ourselves when necessary.
2554 */
2555 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2556 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2557 nfs_initialise_sb(sb);
f7b422b1
DH		 2558}
2559
01c3f052
TM		 2560static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2561{
5eebde23
SJ		 2562 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2563 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2564}
2565
7630c852
CL		 2566static int nfs4_validate_text_mount_data(void *options,
2567 struct nfs_parsed_mount_data *args,
2568 const char *dev_name)
2569{
2570 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2571
f5855fec 2572 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2573
2574 nfs_validate_transport_protocol(args);
2575
2576 nfs4_validate_mount_flags(args);
2577
2ecda72b
TM		 2578 if (args->version != 4) {
2579 dfprintk(MOUNT,
2580 "NFS4: Illegal mount version\n");
2581 return -EINVAL;
2582 }
2583
7630c852
CL		 2584 if (args->auth_flavor_len > 1) {
2585 dfprintk(MOUNT,
2586 "NFS4: Too many RPC auth flavours specified\n");
2587 return -EINVAL;
2588 }
2589
7630c852
CL		 2590 return nfs_parse_devname(dev_name,
2591 &args->nfs_server.hostname,
2592 NFS4_MAXNAMLEN,
2593 &args->nfs_server.export_path,
2594 NFS4_MAXPATHLEN);
2595}
2596
f0768ebd
CL		 2597/*
2598 * Validate NFSv4 mount options
2599 */
91ea40b9
TT		 2600static int nfs4_validate_mount_data(void *options,
2601 struct nfs_parsed_mount_data *args,
2602 const char *dev_name)
f0768ebd 2603{
4cfd74fc 2604 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2605 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2606 char *c;
2607
2608 if (data == NULL)
2609 goto out_no_data;
2610
2611 switch (data->version) {
2612 case 1:
4c568017
CL		 2613 if (data->host_addrlen > sizeof(args->nfs_server.address))
2614 goto out_no_address;
2615 if (data->host_addrlen == 0)
f0768ebd 2616 goto out_no_address;
4c568017 2617 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2618 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2619 return -EFAULT;
4cfd74fc 2620 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2621 goto out_no_address;
2622
6738b251
CL		 2623 if (data->auth_flavourlen) {
2624 if (data->auth_flavourlen > 1)
2625 goto out_inval_auth;
20c71f5e 2626 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2627 data->auth_flavours,
20c71f5e 2628 sizeof(args->auth_flavors[0])))
f0768ebd 2629 return -EFAULT;
f0768ebd
CL		 2630 }
2631
2632 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2633 if (IS_ERR(c))
2634 return PTR_ERR(c);
91ea40b9 2635 args->nfs_server.hostname = c;
f0768ebd
CL		 2636
2637 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2638 if (IS_ERR(c))
2639 return PTR_ERR(c);
91ea40b9
TT		 2640 args->nfs_server.export_path = c;
2641 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2642
2643 c = strndup_user(data->client_addr.data, 16);
2644 if (IS_ERR(c))
2645 return PTR_ERR(c);
91ea40b9
TT		 2646 args->client_address = c;
2647
2648 /*
2649 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2650 * can deal with.
2651 */
2652
2653 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2654 args->rsize = data->rsize;
2655 args->wsize = data->wsize;
2656 args->timeo = data->timeo;
2657 args->retrans = data->retrans;
2658 args->acregmin = data->acregmin;
2659 args->acregmax = data->acregmax;
2660 args->acdirmin = data->acdirmin;
2661 args->acdirmax = data->acdirmax;
2662 args->nfs_server.protocol = data->proto;
259875ef 2663 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2664
2665 break;
7630c852 2666 default:
91ea40b9 2667 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2668 return -EINVAL;
2669
4cfd74fc 2670 if (!nfs_verify_server_address(sap))
80071225 2671 return -EINVAL;
dc045898 2672
7630c852 2673 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2674 }
2675
2676 return 0;
2677
2678out_no_data:
2679 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2680 return -EINVAL;
2681
2682out_inval_auth:
2683 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2684 data->auth_flavourlen);
2685 return -EINVAL;
2686
2687out_no_address:
2688 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2689 return -EINVAL;
f0768ebd
CL		 2690}
2691
54ceac45 2692/*
c02d7adf 2693 * Get the superblock for the NFS4 root partition
54ceac45 2694 */
31f43471
AV		 2695static struct dentry *
2696nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2697 const char *dev_name, void *raw_data)
f7b422b1 2698{
c02d7adf 2699 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2700 struct super_block *s;
2701 struct nfs_server *server;
33852a1f 2702 struct nfs_fh *mntfh;
54ceac45 2703 struct dentry *mntroot;
75180df2 2704 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2705 struct nfs_sb_mountdata sb_mntdata = {
2706 .mntflags = flags,
2707 };
33852a1f
TM		 2708 int error = -ENOMEM;
2709
b157b06c 2710 mntfh = nfs_alloc_fhandle();
33852a1f 2711 if (data == NULL || mntfh == NULL)
8a0d551a 2712 goto out;
f9c3a380 2713
54ceac45 2714 /* Get a volume representation */
33852a1f 2715 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2716 if (IS_ERR(server)) {
2717 error = PTR_ERR(server);
29eb981a 2718 goto out;
f7b422b1 2719 }
e89a5a43 2720 sb_mntdata.server = server;
f7b422b1 2721
75180df2
TM		 2722 if (server->flags & NFS4_MOUNT_UNSHARED)
2723 compare_super = NULL;
2724
fb2088cc
SP		 2725 /* -o noac implies -o sync */
2726 if (server->flags & NFS_MOUNT_NOAC)
2727 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2728
54ceac45 2729 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2730 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2731 if (IS_ERR(s)) {
2732 error = PTR_ERR(s);
f7b422b1 2733 goto out_free;
816724e6
TM		 2734 }
2735
5dd3177a
TM		 2736 if (s->s_fs_info != server) {
2737 nfs_free_server(server);
2738 server = NULL;
fa799759
MS		 2739 } else {
2740 error = nfs_bdi_register(server);
2741 if (error)
cfbc0683 2742 goto error_splat_bdi;
5dd3177a
TM		 2743 }
2744
54ceac45
DH		 2745 if (!s->s_root) {
2746 /* initial superblock/root creation */
54ceac45 2747 nfs4_fill_super(s);
2311b943 2748 nfs_get_cache_cookie(s, data, NULL);
54ceac45 2749 }
f7b422b1 2750
bae36241 2751 mntroot = nfs_get_root(s, mntfh, dev_name);
54ceac45
DH		 2752 if (IS_ERR(mntroot)) {
2753 error = PTR_ERR(mntroot);
2754 goto error_splat_super;
f7b422b1 2755 }
54ceac45 2756
33852a1f 2757 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2758 if (error)
2759 goto error_splat_root;
2760
f7b422b1 2761 s->s_flags |= MS_ACTIVE;
31f43471 2762
31f43471
AV		 2763 nfs_free_fhandle(mntfh);
2764 return mntroot;
29eb981a
CL		 2765
2766out:
b157b06c 2767 nfs_free_fhandle(mntfh);
31f43471 2768 return ERR_PTR(error);
54ceac45 2769
f7b422b1 2770out_free:
54ceac45 2771 nfs_free_server(server);
29eb981a 2772 goto out;
54ceac45 2773
46c8ac74
EP		 2774error_splat_root:
2775 dput(mntroot);
54ceac45 2776error_splat_super:
cfbc0683
N		 2777 if (server && !s->s_root)
2778 bdi_unregister(&server->backing_dev_info);
2779error_splat_bdi:
6f5bbff9 2780 deactivate_locked_super(s);
29eb981a 2781 goto out;
f7b422b1
DH		 2782}
2783
c02d7adf
TM		 2784static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2785 int flags, void *data, const char *hostname)
2786{
2787 struct vfsmount *root_mnt;
2788 char *root_devname;
2789 size_t len;
2790
98a2139f 2791 len = strlen(hostname) + 5;
c02d7adf
TM		 2792 root_devname = kmalloc(len, GFP_KERNEL);
2793 if (root_devname == NULL)
2794 return ERR_PTR(-ENOMEM);
98a2139f
JK		 2795 /* Does hostname needs to be enclosed in brackets? */
2796 if (strchr(hostname, ':'))
2797 snprintf(root_devname, len, "[%s]:/", hostname);
2798 else
2799 snprintf(root_devname, len, "%s:/", hostname);
c02d7adf
TM		 2800 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2801 kfree(root_devname);
2802 return root_mnt;
2803}
2804
ce587e07
TM		 2805struct nfs_referral_count {
2806 struct list_head list;
2807 const struct task_struct *task;
2808 unsigned int referral_count;
2809};
2810
2811static LIST_HEAD(nfs_referral_count_list);
2812static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2813
2814static struct nfs_referral_count *nfs_find_referral_count(void)
2815{
2816 struct nfs_referral_count *p;
2817
2818 list_for_each_entry(p, &nfs_referral_count_list, list) {
2819 if (p->task == current)
2820 return p;
2821 }
2822 return NULL;
2823}
2824
2825#define NFS_MAX_NESTED_REFERRALS 2
2826
2827static int nfs_referral_loop_protect(void)
2828{
2829 struct nfs_referral_count *p, *new;
2830 int ret = -ENOMEM;
2831
2832 new = kmalloc(sizeof(*new), GFP_KERNEL);
2833 if (!new)
2834 goto out;
2835 new->task = current;
2836 new->referral_count = 1;
2837
2838 ret = 0;
2839 spin_lock(&nfs_referral_count_list_lock);
2840 p = nfs_find_referral_count();
2841 if (p != NULL) {
2842 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2843 ret = -ELOOP;
2844 else
2845 p->referral_count++;
2846 } else {
2847 list_add(&new->list, &nfs_referral_count_list);
2848 new = NULL;
2849 }
2850 spin_unlock(&nfs_referral_count_list_lock);
2851 kfree(new);
2852out:
2853 return ret;
2854}
2855
2856static void nfs_referral_loop_unprotect(void)
2857{
2858 struct nfs_referral_count *p;
2859
2860 spin_lock(&nfs_referral_count_list_lock);
2861 p = nfs_find_referral_count();
2862 p->referral_count--;
2863 if (p->referral_count == 0)
2864 list_del(&p->list);
2865 else
2866 p = NULL;
2867 spin_unlock(&nfs_referral_count_list_lock);
2868 kfree(p);
2869}
2870
01194981
AV		 2871static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2872 const char *export_path)
c02d7adf 2873{
01194981 2874 struct dentry *dentry;
5352d3b6 2875 int err;
c02d7adf 2876
5352d3b6
AV		 2877 if (IS_ERR(root_mnt))
2878 return ERR_CAST(root_mnt);
2879
2880 err = nfs_referral_loop_protect();
2881 if (err) {
ea441d11 2882 mntput(root_mnt);
5352d3b6 2883 return ERR_PTR(err);
ea441d11 2884 }
c02d7adf 2885
ea441d11
AV		 2886 dentry = mount_subtree(root_mnt, export_path);
2887 nfs_referral_loop_unprotect();
c02d7adf 2888
01194981 2889 return dentry;
c02d7adf
TM		 2890}
2891
01194981
AV		 2892static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2893 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2894{
2895 char *export_path;
2896 struct vfsmount *root_mnt;
01194981 2897 struct dentry *res;
a6fe23be
CL		 2898
2899 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2900
2901 export_path = data->nfs_server.export_path;
2902 data->nfs_server.export_path = "/";
2903 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2904 data->nfs_server.hostname);
2905 data->nfs_server.export_path = export_path;
2906
5352d3b6 2907 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2908
01194981
AV		 2909 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2910 IS_ERR(res) ? PTR_ERR(res) : 0,
2911 IS_ERR(res) ? " [error]" : "");
2912 return res;
a6fe23be
CL		 2913}
2914
c02d7adf
TM		 2915/*
2916 * Get the superblock for an NFS4 mountpoint
2917 */
01194981
AV		 2918static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2919 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2920{
2921 struct nfs_parsed_mount_data *data;
c02d7adf 2922 int error = -ENOMEM;
01194981 2923 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2924
c5811dbd 2925 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2926 if (data == NULL)
8a0d551a 2927 goto out;
c02d7adf
TM		 2928
2929 /* Validate the mount data */
2930 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2931 if (error < 0) {
2932 res = ERR_PTR(error);
c02d7adf 2933 goto out;
01194981 2934 }
c02d7adf 2935
01194981
AV		 2936 res = nfs4_try_mount(flags, dev_name, data);
2937 if (IS_ERR(res))
2938 error = PTR_ERR(res);
c02d7adf
TM		 2939
2940out:
8a0d551a 2941 nfs_free_parsed_mount_data(data);
01194981 2942 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2943 error != 0 ? " [error]" : "");
01194981 2944 return res;
c02d7adf
TM		 2945}
2946
f7b422b1
DH		 2947static void nfs4_kill_super(struct super_block *sb)
2948{
2949 struct nfs_server *server = NFS_SB(sb);
2950
0f3e66c6 2951 dprintk("--> %s\n", __func__);
515d8611 2952 nfs_super_return_all_delegations(sb);
f7b422b1 2953 kill_anon_super(sb);
08734048 2954 nfs_fscache_release_super_cookie(sb);
54ceac45 2955 nfs_free_server(server);
0f3e66c6 2956 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2957}
2958
2959/*
54ceac45 2960 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2961 */
31f43471
AV		 2962static struct dentry *
2963nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2964 const char *dev_name, void *raw_data)
f7b422b1 2965{
54ceac45
DH		 2966 struct nfs_clone_mount *data = raw_data;
2967 struct super_block *s;
2968 struct nfs_server *server;
2969 struct dentry *mntroot;
75180df2 2970 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2971 struct nfs_sb_mountdata sb_mntdata = {
2972 .mntflags = flags,
2973 };
54ceac45 2974 int error;
f7b422b1 2975
31f43471 2976 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2977
54ceac45 2978 /* create a new volume representation */
7e6eb683 2979 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2980 if (IS_ERR(server)) {
2981 error = PTR_ERR(server);
2982 goto out_err_noserver;
f7b422b1 2983 }
e89a5a43 2984 sb_mntdata.server = server;
f7b422b1 2985
75180df2
TM		 2986 if (server->flags & NFS4_MOUNT_UNSHARED)
2987 compare_super = NULL;
2988
fb2088cc
SP		 2989 /* -o noac implies -o sync */
2990 if (server->flags & NFS_MOUNT_NOAC)
2991 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2992
54ceac45 2993 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2994 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2995 if (IS_ERR(s)) {
2996 error = PTR_ERR(s);
2997 goto out_err_nosb;
f7b422b1 2998 }
f7b422b1 2999
54ceac45
DH		 3000 if (s->s_fs_info != server) {
3001 nfs_free_server(server);
3002 server = NULL;
fa799759
MS		 3003 } else {
3004 error = nfs_bdi_register(server);
3005 if (error)
cfbc0683 3006 goto error_splat_bdi;
54ceac45 3007 }
f7b422b1 3008
54ceac45
DH		 3009 if (!s->s_root) {
3010 /* initial superblock/root creation */
54ceac45 3011 nfs4_clone_super(s, data->sb);
2311b943 3012 nfs_get_cache_cookie(s, NULL, data);
54ceac45 3013 }
f7b422b1 3014
bae36241 3015 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 3016 if (IS_ERR(mntroot)) {
3017 error = PTR_ERR(mntroot);
3018 goto error_splat_super;
3019 }
e9cc6c23
TM		 3020 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3021 dput(mntroot);
3022 error = -ESTALE;
3023 goto error_splat_super;
3024 }
f7b422b1 3025
54ceac45 3026 s->s_flags |= MS_ACTIVE;
54ceac45 3027
46c8ac74
EP		 3028 security_sb_clone_mnt_opts(data->sb, s);
3029
31f43471
AV		 3030 dprintk("<-- nfs4_xdev_mount() = 0\n");
3031 return mntroot;
54ceac45
DH		 3032
3033out_err_nosb:
3034 nfs_free_server(server);
3035out_err_noserver:
31f43471
AV		 3036 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3037 return ERR_PTR(error);
54ceac45
DH		 3038
3039error_splat_super:
cfbc0683
N		 3040 if (server && !s->s_root)
3041 bdi_unregister(&server->backing_dev_info);
3042error_splat_bdi:
6f5bbff9 3043 deactivate_locked_super(s);
31f43471
AV		 3044 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3045 return ERR_PTR(error);
f7b422b1
DH		 3046}
3047
31f43471
AV		 3048static struct dentry *
3049nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3050 const char *dev_name, void *raw_data)
f7b422b1
DH		 3051{
3052 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3053 struct super_block *s;
3054 struct nfs_server *server;
3055 struct dentry *mntroot;
4f727296 3056 struct nfs_fh *mntfh;
75180df2 3057 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3058 struct nfs_sb_mountdata sb_mntdata = {
3059 .mntflags = flags,
3060 };
4f727296 3061 int error = -ENOMEM;
54ceac45
DH		 3062
3063 dprintk("--> nfs4_referral_get_sb()\n");
3064
4f727296
TM		 3065 mntfh = nfs_alloc_fhandle();
3066 if (mntfh == NULL)
3067 goto out_err_nofh;
3068
54ceac45 3069 /* create a new volume representation */
4f727296 3070 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3071 if (IS_ERR(server)) {
3072 error = PTR_ERR(server);
3073 goto out_err_noserver;
3074 }
e89a5a43 3075 sb_mntdata.server = server;
54ceac45 3076
75180df2
TM		 3077 if (server->flags & NFS4_MOUNT_UNSHARED)
3078 compare_super = NULL;
3079
fb2088cc
SP		 3080 /* -o noac implies -o sync */
3081 if (server->flags & NFS_MOUNT_NOAC)
3082 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3083
54ceac45 3084 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3085 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3086 if (IS_ERR(s)) {
3087 error = PTR_ERR(s);
3088 goto out_err_nosb;
3089 }
3090
3091 if (s->s_fs_info != server) {
3092 nfs_free_server(server);
3093 server = NULL;
fa799759
MS		 3094 } else {
3095 error = nfs_bdi_register(server);
3096 if (error)
cfbc0683 3097 goto error_splat_bdi;
54ceac45
DH		 3098 }
3099
3100 if (!s->s_root) {
3101 /* initial superblock/root creation */
54ceac45 3102 nfs4_fill_super(s);
2311b943 3103 nfs_get_cache_cookie(s, NULL, data);
54ceac45
DH		 3104 }
3105
bae36241 3106 mntroot = nfs_get_root(s, mntfh, dev_name);
54ceac45
DH		 3107 if (IS_ERR(mntroot)) {
3108 error = PTR_ERR(mntroot);
3109 goto error_splat_super;
3110 }
e9cc6c23
TM		 3111 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3112 dput(mntroot);
3113 error = -ESTALE;
3114 goto error_splat_super;
3115 }
54ceac45
DH		 3116
3117 s->s_flags |= MS_ACTIVE;
54ceac45 3118
46c8ac74
EP		 3119 security_sb_clone_mnt_opts(data->sb, s);
3120
4f727296 3121 nfs_free_fhandle(mntfh);
54ceac45 3122 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3123 return mntroot;
54ceac45
DH		 3124
3125out_err_nosb:
3126 nfs_free_server(server);
3127out_err_noserver:
4f727296
TM		 3128 nfs_free_fhandle(mntfh);
3129out_err_nofh:
54ceac45 3130 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3131 return ERR_PTR(error);
54ceac45
DH		 3132
3133error_splat_super:
cfbc0683
N		 3134 if (server && !s->s_root)
3135 bdi_unregister(&server->backing_dev_info);
3136error_splat_bdi:
6f5bbff9 3137 deactivate_locked_super(s);
4f727296 3138 nfs_free_fhandle(mntfh);
54ceac45 3139 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3140 return ERR_PTR(error);
f7b422b1
DH		 3141}
3142
c02d7adf
TM		 3143/*
3144 * Create an NFS4 server record on referral traversal
3145 */
01194981
AV		 3146static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3147 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3148{
3149 struct nfs_clone_mount *data = raw_data;
3150 char *export_path;
3151 struct vfsmount *root_mnt;
01194981 3152 struct dentry *res;
c02d7adf 3153
01194981 3154 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3155
3156 export_path = data->mnt_path;
3157 data->mnt_path = "/";
3158
3159 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3160 flags, data, data->hostname);
3161 data->mnt_path = export_path;
3162
5352d3b6 3163 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3164 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3165 IS_ERR(res) ? PTR_ERR(res) : 0,
3166 IS_ERR(res) ? " [error]" : "");
3167 return res;
c02d7adf
TM		 3168}
3169
54ceac45 3170#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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