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NFS: Add debugging messages to NFSv4's CLOSE procedure
[mirror_ubuntu-artful-kernel.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
f7b422b1
DH		 56
57#include <asm/system.h>
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 }
56928edd 704 seq_printf(m, ",proto=%s",
ee671b01 705 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 706 if (version == 4) {
707 if (nfss->port != NFS_PORT)
708 seq_printf(m, ",port=%u", nfss->port);
709 } else
710 if (nfss->port)
711 seq_printf(m, ",port=%u", nfss->port);
712
33170233
TM		 713 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
714 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 715 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 716
717 if (version != 4)
718 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 719 else
720 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 721
b797cac7
DH		 722 if (nfss->options & NFS_OPTION_FSCACHE)
723 seq_printf(m, ",fsc");
9b00c643
PL		 724
725 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
726 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
727 seq_printf(m, ",lookupcache=none");
728 else
729 seq_printf(m, ",lookupcache=pos");
730 }
7c563cc9
SJ		 731
732 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
733 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
734
735 if (!local_flock && !local_fcntl)
736 seq_printf(m, ",local_lock=none");
737 else if (local_flock && local_fcntl)
738 seq_printf(m, ",local_lock=all");
739 else if (local_flock)
740 seq_printf(m, ",local_lock=flock");
741 else
742 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 743}
744
745/*
746 * Describe the mount options on this VFS mountpoint
747 */
34c80b1d 748static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 749{
34c80b1d 750 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 751
752 nfs_show_mount_options(m, nfss, 0);
753
5d8515ca
CL		 754 seq_printf(m, ",addr=%s",
755 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
756 RPC_DISPLAY_ADDR));
f7b422b1
DH		 757
758 return 0;
759}
45402c38
HS		 760
761#ifdef CONFIG_NFS_V4
ae50c0b5 762#ifdef CONFIG_NFS_V4_1
45402c38 763static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 764{
765 if (nfs4_has_session(server->nfs_client))
766 seq_printf(m, ",sessions");
767}
768#else
45402c38
HS		 769static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
770#endif
ae50c0b5
BF		 771#endif
772
45402c38 773#ifdef CONFIG_NFS_V4
ae50c0b5 774#ifdef CONFIG_NFS_V4_1
45402c38 775static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 776{
777 seq_printf(m, ",pnfs=");
778 if (server->pnfs_curr_ld)
779 seq_printf(m, "%s", server->pnfs_curr_ld->name);
780 else
781 seq_printf(m, "not configured");
782}
45402c38
HS		 783#else
784static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
785#endif
786#endif
f7b422b1 787
d861c630 788static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 789{
790 char *page = (char *) __get_free_page(GFP_KERNEL);
791 char *devname, *dummy;
792 int err = 0;
793 if (!page)
794 return -ENOMEM;
d861c630 795 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 796 if (IS_ERR(devname))
797 err = PTR_ERR(devname);
798 else
799 seq_escape(m, devname, " \t\n\\");
800 free_page((unsigned long)page);
801 return err;
802}
803
a6322de6 804static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 805{
806 seq_puts(m, "/");
807 return 0;
808}
809
f7b422b1
DH		 810/*
811 * Present statistical information for this VFS mountpoint
812 */
64132379 813static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 814{
815 int i, cpu;
64132379 816 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 817 struct rpc_auth *auth = nfss->client->cl_auth;
818 struct nfs_iostats totals = { };
819
820 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
821
822 /*
823 * Display all mount option settings
824 */
825 seq_printf(m, "\n\topts:\t");
64132379
AV		 826 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
827 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
828 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
829 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 830 nfs_show_mount_options(m, nfss, 1);
831
832 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
833
7d2ed9ac
WAA		 834 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
835 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
836 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
837 "date='%llu,%u'",
838 impl_id->name, impl_id->domain,
839 impl_id->date.seconds, impl_id->date.nseconds);
840 }
841
f7b422b1
DH		 842 seq_printf(m, "\n\tcaps:\t");
843 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 844 seq_printf(m, ",wtmult=%u", nfss->wtmult);
845 seq_printf(m, ",dtsize=%u", nfss->dtsize);
846 seq_printf(m, ",bsize=%u", nfss->bsize);
847 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 848
849#ifdef CONFIG_NFS_V4
40c55319 850 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 851 seq_printf(m, "\n\tnfsv4:\t");
852 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
853 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
854 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 855 show_sessions(m, nfss);
856 show_pnfs(m, nfss);
f7b422b1
DH		 857 }
858#endif
859
860 /*
861 * Display security flavor in effect for this mount
862 */
2d767432 863 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 864 if (auth->au_flavor)
2d767432 865 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 866
867 /*
868 * Display superblock I/O counters
869 */
870 for_each_possible_cpu(cpu) {
871 struct nfs_iostats *stats;
872
873 preempt_disable();
874 stats = per_cpu_ptr(nfss->io_stats, cpu);
875
876 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
877 totals.events[i] += stats->events[i];
878 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
879 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 880#ifdef CONFIG_NFS_FSCACHE
881 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
882 totals.fscache[i] += stats->fscache[i];
883#endif
f7b422b1
DH		 884
885 preempt_enable();
886 }
887
888 seq_printf(m, "\n\tevents:\t");
889 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
890 seq_printf(m, "%lu ", totals.events[i]);
891 seq_printf(m, "\n\tbytes:\t");
892 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
893 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 894#ifdef CONFIG_NFS_FSCACHE
895 if (nfss->options & NFS_OPTION_FSCACHE) {
896 seq_printf(m, "\n\tfsc:\t");
897 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
898 seq_printf(m, "%Lu ", totals.bytes[i]);
899 }
900#endif
f7b422b1
DH		 901 seq_printf(m, "\n");
902
903 rpc_print_iostats(m, nfss->client);
904
905 return 0;
906}
907
908/*
909 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 910 * in response to xdev traversals and referrals
f7b422b1 911 */
42faad99 912static void nfs_umount_begin(struct super_block *sb)
f7b422b1 913{
67e55205 914 struct nfs_server *server;
fc6ae3cf
TM		 915 struct rpc_clnt *rpc;
916
67e55205 917 server = NFS_SB(sb);
fc6ae3cf
TM		 918 /* -EIO all pending I/O */
919 rpc = server->client_acl;
920 if (!IS_ERR(rpc))
921 rpc_killall_tasks(rpc);
922 rpc = server->client;
923 if (!IS_ERR(rpc))
924 rpc_killall_tasks(rpc);
f7b422b1
DH		 925}
926
c5811dbd 927static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 928{
929 struct nfs_parsed_mount_data *data;
930
931 data = kzalloc(sizeof(*data), GFP_KERNEL);
932 if (data) {
9423a08a
CL		 933 data->acregmin = NFS_DEF_ACREGMIN;
934 data->acregmax = NFS_DEF_ACREGMAX;
935 data->acdirmin = NFS_DEF_ACDIRMIN;
936 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 937 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 938 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 939 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 940 data->auth_flavors[0] = RPC_AUTH_UNIX;
941 data->auth_flavor_len = 1;
c5811dbd 942 data->version = version;
9423a08a 943 data->minorversion = 0;
9937347a 944 data->net = current->nsproxy->net_ns;
8a0d551a 945 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 946 }
947 return data;
948}
949
8a0d551a
JL		 950static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
951{
952 if (data) {
953 kfree(data->client_address);
954 kfree(data->mount_server.hostname);
955 kfree(data->nfs_server.export_path);
956 kfree(data->nfs_server.hostname);
957 kfree(data->fscache_uniq);
958 security_free_mnt_opts(&data->lsm_opts);
959 kfree(data);
960 }
961}
962
fc50d58f 963/*
cdcd7f9a
CL		 964 * Sanity-check a server address provided by the mount command.
965 *
966 * Address family must be initialized, and address must not be
967 * the ANY address for that family.
fc50d58f
CL		 968 */
969static int nfs_verify_server_address(struct sockaddr *addr)
970{
971 switch (addr->sa_family) {
972 case AF_INET: {
cdcd7f9a 973 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 974 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 975 }
976 case AF_INET6: {
977 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
978 return !ipv6_addr_any(sa);
fc50d58f
CL		 979 }
980 }
981
53a0b9c4 982 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 983 return 0;
984}
985
4cfd74fc
CL		 986/*
987 * Select between a default port value and a user-specified port value.
988 * If a zero value is set, then autobind will be used.
989 */
f5855fec 990static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 991 const unsigned short default_port)
992{
f5855fec
TM		 993 if (*port == NFS_UNSPEC_PORT)
994 *port = default_port;
4cfd74fc 995
f5855fec 996 rpc_set_port(sap, *port);
4cfd74fc
CL		 997}
998
259875ef
TM		 999/*
1000 * Sanity check the NFS transport protocol.
1001 *
1002 */
1003static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1004{
1005 switch (mnt->nfs_server.protocol) {
1006 case XPRT_TRANSPORT_UDP:
1007 case XPRT_TRANSPORT_TCP:
1008 case XPRT_TRANSPORT_RDMA:
1009 break;
1010 default:
1011 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1012 }
1013}
1014
1015/*
1016 * For text based NFSv2/v3 mounts, the mount protocol transport default
1017 * settings should depend upon the specified NFS transport.
1018 */
1019static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1020{
1021 nfs_validate_transport_protocol(mnt);
1022
1023 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1024 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1025 return;
1026 switch (mnt->nfs_server.protocol) {
1027 case XPRT_TRANSPORT_UDP:
1028 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1029 break;
1030 case XPRT_TRANSPORT_TCP:
1031 case XPRT_TRANSPORT_RDMA:
1032 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1033 }
1034}
1035
01060c89
CL		 1036/*
1037 * Parse the value of the 'sec=' option.
01060c89
CL		 1038 */
1039static int nfs_parse_security_flavors(char *value,
1040 struct nfs_parsed_mount_data *mnt)
1041{
1042 substring_t args[MAX_OPT_ARGS];
1043
1044 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1045
1046 switch (match_token(value, nfs_secflavor_tokens, args)) {
1047 case Opt_sec_none:
01060c89
CL		 1048 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1049 break;
1050 case Opt_sec_sys:
01060c89
CL		 1051 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1052 break;
1053 case Opt_sec_krb5:
01060c89
CL		 1054 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1055 break;
1056 case Opt_sec_krb5i:
01060c89
CL		 1057 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1058 break;
1059 case Opt_sec_krb5p:
01060c89
CL		 1060 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1061 break;
1062 case Opt_sec_lkey:
01060c89
CL		 1063 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1064 break;
1065 case Opt_sec_lkeyi:
01060c89
CL		 1066 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1067 break;
1068 case Opt_sec_lkeyp:
01060c89
CL		 1069 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1070 break;
1071 case Opt_sec_spkm:
01060c89
CL		 1072 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1073 break;
1074 case Opt_sec_spkmi:
01060c89
CL		 1075 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1076 break;
1077 case Opt_sec_spkmp:
01060c89
CL		 1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1079 break;
1080 default:
1081 return 0;
1082 }
1083
9b7160c5 1084 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1085 mnt->auth_flavor_len = 1;
01060c89
CL		 1086 return 1;
1087}
1088
0d71b058
TM		 1089static int nfs_parse_version_string(char *string,
1090 struct nfs_parsed_mount_data *mnt,
1091 substring_t *args)
1092{
1093 mnt->flags &= ~NFS_MOUNT_VER3;
1094 switch (match_token(string, nfs_vers_tokens, args)) {
1095 case Opt_vers_2:
1096 mnt->version = 2;
1097 break;
1098 case Opt_vers_3:
1099 mnt->flags |= NFS_MOUNT_VER3;
1100 mnt->version = 3;
1101 break;
1102 case Opt_vers_4:
1103 /* Backward compatibility option. In future,
1104 * the mount program should always supply
1105 * a NFSv4 minor version number.
1106 */
1107 mnt->version = 4;
1108 break;
1109 case Opt_vers_4_0:
1110 mnt->version = 4;
1111 mnt->minorversion = 0;
1112 break;
1113 case Opt_vers_4_1:
1114 mnt->version = 4;
1115 mnt->minorversion = 1;
1116 break;
1117 default:
1118 return 0;
1119 }
1120 return 1;
1121}
1122
c5cb09b6
RL		 1123static int nfs_get_option_str(substring_t args[], char **option)
1124{
1125 kfree(*option);
1126 *option = match_strdup(args);
1127 return !option;
1128}
1129
1130static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1131{
1132 int rc;
1133 char *string;
1134
1135 string = match_strdup(args);
1136 if (string == NULL)
1137 return -ENOMEM;
1138 rc = strict_strtoul(string, 10, option);
1139 kfree(string);
1140
1141 return rc;
1142}
1143
bf0fd768
CL		 1144/*
1145 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1146 * a data structure. The whole mount string is processed; bad options are
1147 * skipped as they are encountered. If there were no errors, return 1;
1148 * otherwise return 0 (zero).
bf0fd768
CL		 1149 */
1150static int nfs_parse_mount_options(char *raw,
1151 struct nfs_parsed_mount_data *mnt)
1152{
f9c3a380 1153 char *p, *string, *secdata;
d23c45fd 1154 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1155 unsigned short protofamily = AF_UNSPEC;
1156 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1157
1158 if (!raw) {
1159 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1160 return 1;
1161 }
1162 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1163
f9c3a380
EP		 1164 secdata = alloc_secdata();
1165 if (!secdata)
1166 goto out_nomem;
1167
1168 rc = security_sb_copy_data(raw, secdata);
1169 if (rc)
1170 goto out_security_failure;
1171
1172 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1173 if (rc)
1174 goto out_security_failure;
1175
1176 free_secdata(secdata);
1177
bf0fd768
CL		 1178 while ((p = strsep(&raw, ",")) != NULL) {
1179 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1180 unsigned long option;
1181 int token;
bf0fd768
CL		 1182
1183 if (!*p)
1184 continue;
1185
1186 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1187
1188 token = match_token(p, nfs_mount_option_tokens, args);
1189 switch (token) {
f45663ce
CL		 1190
1191 /*
1192 * boolean options: foo/nofoo
1193 */
bf0fd768
CL		 1194 case Opt_soft:
1195 mnt->flags |= NFS_MOUNT_SOFT;
1196 break;
1197 case Opt_hard:
1198 mnt->flags &= ~NFS_MOUNT_SOFT;
1199 break;
bf0fd768
CL		 1200 case Opt_posix:
1201 mnt->flags |= NFS_MOUNT_POSIX;
1202 break;
1203 case Opt_noposix:
1204 mnt->flags &= ~NFS_MOUNT_POSIX;
1205 break;
1206 case Opt_cto:
1207 mnt->flags &= ~NFS_MOUNT_NOCTO;
1208 break;
1209 case Opt_nocto:
1210 mnt->flags |= NFS_MOUNT_NOCTO;
1211 break;
1212 case Opt_ac:
1213 mnt->flags &= ~NFS_MOUNT_NOAC;
1214 break;
1215 case Opt_noac:
1216 mnt->flags |= NFS_MOUNT_NOAC;
1217 break;
1218 case Opt_lock:
1219 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1220 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1221 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1222 break;
1223 case Opt_nolock:
1224 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1225 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1226 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1227 break;
bf0fd768
CL		 1228 case Opt_udp:
1229 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1230 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1231 break;
1232 case Opt_tcp:
1233 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1234 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1235 break;
2cf7ff7a
TT		 1236 case Opt_rdma:
1237 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1238 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1239 xprt_load_transport(p);
2cf7ff7a 1240 break;
bf0fd768
CL		 1241 case Opt_acl:
1242 mnt->flags &= ~NFS_MOUNT_NOACL;
1243 break;
1244 case Opt_noacl:
1245 mnt->flags |= NFS_MOUNT_NOACL;
1246 break;
1247 case Opt_rdirplus:
1248 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1249 break;
1250 case Opt_nordirplus:
1251 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1252 break;
75180df2
TM		 1253 case Opt_sharecache:
1254 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1255 break;
1256 case Opt_nosharecache:
1257 mnt->flags |= NFS_MOUNT_UNSHARED;
1258 break;
d740351b
CL		 1259 case Opt_resvport:
1260 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1261 break;
1262 case Opt_noresvport:
1263 mnt->flags |= NFS_MOUNT_NORESVPORT;
1264 break;
b797cac7
DH		 1265 case Opt_fscache:
1266 mnt->options |= NFS_OPTION_FSCACHE;
1267 kfree(mnt->fscache_uniq);
1268 mnt->fscache_uniq = NULL;
1269 break;
1270 case Opt_nofscache:
1271 mnt->options &= ~NFS_OPTION_FSCACHE;
1272 kfree(mnt->fscache_uniq);
1273 mnt->fscache_uniq = NULL;
1274 break;
bf0fd768 1275
f45663ce
CL		 1276 /*
1277 * options that take numeric values
1278 */
bf0fd768 1279 case Opt_port:
c5cb09b6
RL		 1280 if (nfs_get_option_ul(args, &option) ||
1281 option > USHRT_MAX)
d23c45fd
CL		 1282 goto out_invalid_value;
1283 mnt->nfs_server.port = option;
bf0fd768
CL		 1284 break;
1285 case Opt_rsize:
c5cb09b6 1286 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1287 goto out_invalid_value;
1288 mnt->rsize = option;
bf0fd768
CL		 1289 break;
1290 case Opt_wsize:
c5cb09b6 1291 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1292 goto out_invalid_value;
1293 mnt->wsize = option;
bf0fd768
CL		 1294 break;
1295 case Opt_bsize:
c5cb09b6 1296 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1297 goto out_invalid_value;
1298 mnt->bsize = option;
bf0fd768
CL		 1299 break;
1300 case Opt_timeo:
c5cb09b6 1301 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1302 goto out_invalid_value;
1303 mnt->timeo = option;
bf0fd768
CL		 1304 break;
1305 case Opt_retrans:
c5cb09b6 1306 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1307 goto out_invalid_value;
1308 mnt->retrans = option;
bf0fd768
CL		 1309 break;
1310 case Opt_acregmin:
c5cb09b6 1311 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1312 goto out_invalid_value;
1313 mnt->acregmin = option;
bf0fd768
CL		 1314 break;
1315 case Opt_acregmax:
c5cb09b6 1316 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1317 goto out_invalid_value;
1318 mnt->acregmax = option;
bf0fd768
CL		 1319 break;
1320 case Opt_acdirmin:
c5cb09b6 1321 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1322 goto out_invalid_value;
1323 mnt->acdirmin = option;
bf0fd768
CL		 1324 break;
1325 case Opt_acdirmax:
c5cb09b6 1326 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1327 goto out_invalid_value;
1328 mnt->acdirmax = option;
bf0fd768
CL		 1329 break;
1330 case Opt_actimeo:
c5cb09b6 1331 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1332 goto out_invalid_value;
1333 mnt->acregmin = mnt->acregmax =
1334 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1335 break;
1336 case Opt_namelen:
c5cb09b6 1337 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1338 goto out_invalid_value;
1339 mnt->namlen = option;
bf0fd768
CL		 1340 break;
1341 case Opt_mountport:
c5cb09b6
RL		 1342 if (nfs_get_option_ul(args, &option) ||
1343 option > USHRT_MAX)
d23c45fd
CL		 1344 goto out_invalid_value;
1345 mnt->mount_server.port = option;
bf0fd768 1346 break;
bf0fd768 1347 case Opt_mountvers:
c5cb09b6 1348 if (nfs_get_option_ul(args, &option) ||
f45663ce 1349 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1350 option > NFS_MNT3_VERSION)
1351 goto out_invalid_value;
1352 mnt->mount_server.version = option;
bf0fd768 1353 break;
3fd5be9e 1354 case Opt_minorversion:
c5cb09b6 1355 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1356 goto out_invalid_value;
1357 if (option > NFS4_MAX_MINOR_VERSION)
1358 goto out_invalid_value;
1359 mnt->minorversion = option;
3fd5be9e 1360 break;
bf0fd768 1361
f45663ce
CL		 1362 /*
1363 * options that take text values
1364 */
0d71b058
TM		 1365 case Opt_nfsvers:
1366 string = match_strdup(args);
1367 if (string == NULL)
1368 goto out_nomem;
1369 rc = nfs_parse_version_string(string, mnt, args);
1370 kfree(string);
1371 if (!rc)
1372 goto out_invalid_value;
1373 break;
bf0fd768
CL		 1374 case Opt_sec:
1375 string = match_strdup(args);
1376 if (string == NULL)
1377 goto out_nomem;
01060c89 1378 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1379 kfree(string);
f45663ce 1380 if (!rc) {
f45663ce
CL		 1381 dfprintk(MOUNT, "NFS: unrecognized "
1382 "security flavor\n");
d23c45fd 1383 return 0;
f45663ce 1384 }
bf0fd768
CL		 1385 break;
1386 case Opt_proto:
1387 string = match_strdup(args);
1388 if (string == NULL)
1389 goto out_nomem;
1390 token = match_token(string,
1391 nfs_xprt_protocol_tokens, args);
bf0fd768 1392
ee671b01 1393 protofamily = AF_INET;
bf0fd768 1394 switch (token) {
ee671b01
JL		 1395 case Opt_xprt_udp6:
1396 protofamily = AF_INET6;
fdb66ff4 1397 case Opt_xprt_udp:
bf0fd768 1398 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1399 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1400 break;
ee671b01
JL		 1401 case Opt_xprt_tcp6:
1402 protofamily = AF_INET6;
fdb66ff4 1403 case Opt_xprt_tcp:
bf0fd768 1404 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1405 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1406 break;
2cf7ff7a
TT		 1407 case Opt_xprt_rdma:
1408 /* vector side protocols to TCP */
1409 mnt->flags |= NFS_MOUNT_TCP;
1410 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1411 xprt_load_transport(string);
2cf7ff7a 1412 break;
bf0fd768 1413 default:
f45663ce
CL		 1414 dfprintk(MOUNT, "NFS: unrecognized "
1415 "transport protocol\n");
4223a4a1 1416 kfree(string);
d23c45fd 1417 return 0;
bf0fd768 1418 }
c5cb09b6 1419 kfree(string);
bf0fd768
CL		 1420 break;
1421 case Opt_mountproto:
1422 string = match_strdup(args);
1423 if (string == NULL)
1424 goto out_nomem;
1425 token = match_token(string,
1426 nfs_xprt_protocol_tokens, args);
d508afb4 1427 kfree(string);
bf0fd768 1428
ee671b01 1429 mountfamily = AF_INET;
bf0fd768 1430 switch (token) {
ee671b01
JL		 1431 case Opt_xprt_udp6:
1432 mountfamily = AF_INET6;
fdb66ff4 1433 case Opt_xprt_udp:
0896a725 1434 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1435 break;
ee671b01
JL		 1436 case Opt_xprt_tcp6:
1437 mountfamily = AF_INET6;
fdb66ff4 1438 case Opt_xprt_tcp:
0896a725 1439 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1440 break;
2cf7ff7a 1441 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1442 default:
f45663ce
CL		 1443 dfprintk(MOUNT, "NFS: unrecognized "
1444 "transport protocol\n");
d23c45fd 1445 return 0;
bf0fd768
CL		 1446 }
1447 break;
1448 case Opt_addr:
1449 string = match_strdup(args);
1450 if (string == NULL)
1451 goto out_nomem;
53a0b9c4 1452 mnt->nfs_server.addrlen =
b48e1278 1453 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1454 (struct sockaddr *)
1455 &mnt->nfs_server.address,
1456 sizeof(mnt->nfs_server.address));
bf0fd768 1457 kfree(string);
53a0b9c4
CL		 1458 if (mnt->nfs_server.addrlen == 0)
1459 goto out_invalid_address;
bf0fd768
CL		 1460 break;
1461 case Opt_clientaddr:
c5cb09b6 1462 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1463 goto out_nomem;
bf0fd768 1464 break;
33832034 1465 case Opt_mounthost:
c5cb09b6
RL		 1466 if (nfs_get_option_str(args,
1467 &mnt->mount_server.hostname))
33832034 1468 goto out_nomem;
33832034 1469 break;
0ac83779 1470 case Opt_mountaddr:
bf0fd768
CL		 1471 string = match_strdup(args);
1472 if (string == NULL)
1473 goto out_nomem;
53a0b9c4 1474 mnt->mount_server.addrlen =
b48e1278 1475 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1476 (struct sockaddr *)
1477 &mnt->mount_server.address,
1478 sizeof(mnt->mount_server.address));
bf0fd768 1479 kfree(string);
53a0b9c4
CL		 1480 if (mnt->mount_server.addrlen == 0)
1481 goto out_invalid_address;
bf0fd768 1482 break;
7973c1f1
TM		 1483 case Opt_lookupcache:
1484 string = match_strdup(args);
1485 if (string == NULL)
1486 goto out_nomem;
1487 token = match_token(string,
1488 nfs_lookupcache_tokens, args);
1489 kfree(string);
1490 switch (token) {
1491 case Opt_lookupcache_all:
1492 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1493 break;
1494 case Opt_lookupcache_positive:
1495 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1496 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1497 break;
1498 case Opt_lookupcache_none:
1499 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1500 break;
1501 default:
7973c1f1
TM		 1502 dfprintk(MOUNT, "NFS: invalid "
1503 "lookupcache argument\n");
d23c45fd 1504 return 0;
7973c1f1
TM		 1505 };
1506 break;
a6d5ff64 1507 case Opt_fscache_uniq:
c5cb09b6 1508 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1509 goto out_nomem;
a6d5ff64
CL		 1510 mnt->options |= NFS_OPTION_FSCACHE;
1511 break;
5eebde23
SJ		 1512 case Opt_local_lock:
1513 string = match_strdup(args);
1514 if (string == NULL)
1515 goto out_nomem;
1516 token = match_token(string, nfs_local_lock_tokens,
1517 args);
1518 kfree(string);
1519 switch (token) {
1520 case Opt_local_lock_all:
1521 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1522 NFS_MOUNT_LOCAL_FCNTL);
1523 break;
1524 case Opt_local_lock_flock:
1525 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1526 break;
1527 case Opt_local_lock_posix:
1528 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1529 break;
1530 case Opt_local_lock_none:
1531 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1532 NFS_MOUNT_LOCAL_FCNTL);
1533 break;
1534 default:
1535 dfprintk(MOUNT, "NFS: invalid "
1536 "local_lock argument\n");
1537 return 0;
1538 };
1539 break;
bf0fd768 1540
f45663ce
CL		 1541 /*
1542 * Special options
1543 */
1544 case Opt_sloppy:
1545 sloppy = 1;
1546 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1547 break;
bf0fd768
CL		 1548 case Opt_userspace:
1549 case Opt_deprecated:
d33e4dfe
CL		 1550 dfprintk(MOUNT, "NFS: ignoring mount option "
1551 "'%s'\n", p);
bf0fd768
CL		 1552 break;
1553
1554 default:
d23c45fd 1555 invalid_option = 1;
f45663ce
CL		 1556 dfprintk(MOUNT, "NFS: unrecognized mount option "
1557 "'%s'\n", p);
bf0fd768
CL		 1558 }
1559 }
1560
d23c45fd
CL		 1561 if (!sloppy && invalid_option)
1562 return 0;
1563
571b7554
WAA		 1564 if (mnt->minorversion && mnt->version != 4)
1565 goto out_minorversion_mismatch;
1566
ee671b01
JL		 1567 /*
1568 * verify that any proto=/mountproto= options match the address
1569 * familiies in the addr=/mountaddr= options.
1570 */
1571 if (protofamily != AF_UNSPEC &&
1572 protofamily != mnt->nfs_server.address.ss_family)
1573 goto out_proto_mismatch;
1574
1575 if (mountfamily != AF_UNSPEC) {
1576 if (mnt->mount_server.addrlen) {
1577 if (mountfamily != mnt->mount_server.address.ss_family)
1578 goto out_mountproto_mismatch;
1579 } else {
1580 if (mountfamily != mnt->nfs_server.address.ss_family)
1581 goto out_mountproto_mismatch;
1582 }
1583 }
1584
bf0fd768
CL		 1585 return 1;
1586
ee671b01
JL		 1587out_mountproto_mismatch:
1588 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1589 "option\n");
1590 return 0;
1591out_proto_mismatch:
1592 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1593 return 0;
53a0b9c4
CL		 1594out_invalid_address:
1595 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1596 return 0;
d23c45fd 1597out_invalid_value:
53a0b9c4 1598 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1599 return 0;
571b7554
WAA		 1600out_minorversion_mismatch:
1601 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1602 "minorversion=%u\n", mnt->version, mnt->minorversion);
1603 return 0;
bf0fd768
CL		 1604out_nomem:
1605 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1606 return 0;
f9c3a380
EP		 1607out_security_failure:
1608 free_secdata(secdata);
1609 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1610 return 0;
bf0fd768
CL		 1611}
1612
ec88f28d
CL		 1613/*
1614 * Match the requested auth flavors with the list returned by
1615 * the server. Returns zero and sets the mount's authentication
1616 * flavor on success; returns -EACCES if server does not support
1617 * the requested flavor.
1618 */
1619static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1620 struct nfs_mount_request *request)
1621{
1622 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1623
5eecfde6
CL		 1624 /*
1625 * Certain releases of Linux's mountd return an empty
1626 * flavor list. To prevent behavioral regression with
1627 * these servers (ie. rejecting mounts that used to
1628 * succeed), revert to pre-2.6.32 behavior (no checking)
1629 * if the returned flavor list is empty.
1630 */
1631 if (server_authlist_len == 0)
1632 return 0;
1633
ec88f28d
CL		 1634 /*
1635 * We avoid sophisticated negotiating here, as there are
1636 * plenty of cases where we can get it wrong, providing
1637 * either too little or too much security.
1638 *
1639 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1640 * flavor listed first. However, some servers list
1641 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1642 * preferred default, in args->auth_flavors[0] if user
1643 * didn't specify sec= mount option.
1644 */
1645 for (i = 0; i < args->auth_flavor_len; i++)
1646 for (j = 0; j < server_authlist_len; j++)
1647 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1648 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1649 request->auth_flavs[j]);
1650 args->auth_flavors[0] = request->auth_flavs[j];
1651 return 0;
1652 }
1653
1654 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1655 nfs_umount(request);
1656 return -EACCES;
1657}
1658
0076d7b7
CL		 1659/*
1660 * Use the remote server's MOUNT service to request the NFS file handle
1661 * corresponding to the provided path.
1662 */
1663static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1664 struct nfs_fh *root_fh)
1665{
ec88f28d
CL		 1666 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1667 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1668 struct nfs_mount_request request = {
1669 .sap = (struct sockaddr *)
1670 &args->mount_server.address,
1671 .dirpath = args->nfs_server.export_path,
1672 .protocol = args->mount_server.protocol,
1673 .fh = root_fh,
50a737f8 1674 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1675 .auth_flav_len = &server_authlist_len,
1676 .auth_flavs = server_authlist,
6d59b8d5 1677 .net = args->net,
c5d120f8 1678 };
4c568017 1679 int status;
0076d7b7
CL		 1680
1681 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1682 switch (args->version) {
1683 default:
1684 args->mount_server.version = NFS_MNT3_VERSION;
1685 break;
1686 case 2:
1687 args->mount_server.version = NFS_MNT_VERSION;
1688 }
0076d7b7 1689 }
c5d120f8 1690 request.version = args->mount_server.version;
0076d7b7 1691
33832034 1692 if (args->mount_server.hostname)
c5d120f8 1693 request.hostname = args->mount_server.hostname;
33832034 1694 else
c5d120f8 1695 request.hostname = args->nfs_server.hostname;
33832034 1696
0076d7b7
CL		 1697 /*
1698 * Construct the mount server's address.
1699 */
4c568017 1700 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1701 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1702 args->nfs_server.addrlen);
1703 args->mount_server.addrlen = args->nfs_server.addrlen;
1704 }
c5d120f8 1705 request.salen = args->mount_server.addrlen;
f5855fec 1706 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1707
1708 /*
1709 * Now ask the mount server to map our export path
1710 * to a file handle.
1711 */
c5d120f8 1712 status = nfs_mount(&request);
ec88f28d
CL		 1713 if (status != 0) {
1714 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1715 request.hostname, status);
1716 return status;
1717 }
0076d7b7 1718
ec88f28d
CL		 1719 /*
1720 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1721 */
1722 if (args->mount_server.version != NFS_MNT3_VERSION)
1723 return 0;
1724 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1725}
1726
c12bacec
RL		 1727/*
1728 * Split "dev_name" into "hostname:export_path".
1729 *
1730 * The leftmost colon demarks the split between the server's hostname
1731 * and the export path. If the hostname starts with a left square
1732 * bracket, then it may contain colons.
1733 *
1734 * Note: caller frees hostname and export path, even on error.
1735 */
1736static int nfs_parse_devname(const char *dev_name,
1737 char **hostname, size_t maxnamlen,
1738 char **export_path, size_t maxpathlen)
dc045898
CL		 1739{
1740 size_t len;
c12bacec 1741 char *end;
dc045898 1742
c12bacec
RL		 1743 /* Is the host name protected with square brakcets? */
1744 if (*dev_name == '[') {
1745 end = strchr(++dev_name, ']');
1746 if (end == NULL || end[1] != ':')
dc045898 1747 goto out_bad_devname;
dc045898 1748
c12bacec
RL		 1749 len = end - dev_name;
1750 end++;
1751 } else {
1752 char *comma;
dc045898 1753
c12bacec
RL		 1754 end = strchr(dev_name, ':');
1755 if (end == NULL)
1756 goto out_bad_devname;
1757 len = end - dev_name;
d1aa0825 1758
c12bacec
RL		 1759 /* kill possible hostname list: not supported */
1760 comma = strchr(dev_name, ',');
1761 if (comma != NULL && comma < end)
1762 *comma = 0;
1763 }
d1aa0825 1764
d1aa0825
CL		 1765 if (len > maxnamlen)
1766 goto out_hostname;
1767
1768 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1769 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1770 if (*hostname == NULL)
1771 goto out_nomem;
c12bacec 1772 len = strlen(++end);
d1aa0825
CL		 1773 if (len > maxpathlen)
1774 goto out_path;
1775 *export_path = kstrndup(end, len, GFP_KERNEL);
1776 if (!*export_path)
1777 goto out_nomem;
1778
c12bacec 1779 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1780 return 0;
1781
1782out_bad_devname:
1783 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1784 return -EINVAL;
1785
1786out_nomem:
1787 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1788 return -ENOMEM;
1789
1790out_hostname:
1791 dfprintk(MOUNT, "NFS: server hostname too long\n");
1792 return -ENAMETOOLONG;
1793
1794out_path:
1795 dfprintk(MOUNT, "NFS: export pathname too long\n");
1796 return -ENAMETOOLONG;
1797}
1798
f7b422b1 1799/*
54ceac45
DH		 1800 * Validate the NFS2/NFS3 mount data
1801 * - fills in the mount root filehandle
136d558c
CL		 1802 *
1803 * For option strings, user space handles the following behaviors:
1804 *
1805 * + DNS: mapping server host name to IP address ("addr=" option)
1806 *
1807 * + failure mode: how to behave if a mount request can't be handled
1808 * immediately ("fg/bg" option)
1809 *
1810 * + retry: how often to retry a mount request ("retry=" option)
1811 *
1812 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1813 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1814 */
2283f8d6
TT		 1815static int nfs_validate_mount_data(void *options,
1816 struct nfs_parsed_mount_data *args,
136d558c
CL		 1817 struct nfs_fh *mntfh,
1818 const char *dev_name)
f7b422b1 1819{
2283f8d6 1820 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1821 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1822
5df36e78
CL		 1823 if (data == NULL)
1824 goto out_no_data;
f7b422b1 1825
54ceac45 1826 switch (data->version) {
5df36e78
CL		 1827 case 1:
1828 data->namlen = 0;
1829 case 2:
1830 data->bsize = 0;
1831 case 3:
1832 if (data->flags & NFS_MOUNT_VER3)
1833 goto out_no_v3;
1834 data->root.size = NFS2_FHSIZE;
1835 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1836 case 4:
1837 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1838 goto out_no_sec;
1839 case 5:
1840 memset(data->context, 0, sizeof(data->context));
1841 case 6:
b7e24457
TM		 1842 if (data->flags & NFS_MOUNT_VER3) {
1843 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1844 goto out_invalid_fh;
5df36e78 1845 mntfh->size = data->root.size;
764302cc
CL		 1846 args->version = 3;
1847 } else {
5df36e78 1848 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1849 args->version = 2;
1850 }
5df36e78 1851
5df36e78
CL		 1852
1853 memcpy(mntfh->data, data->root.data, mntfh->size);
1854 if (mntfh->size < sizeof(mntfh->data))
1855 memset(mntfh->data + mntfh->size, 0,
1856 sizeof(mntfh->data) - mntfh->size);
6e88e061 1857
2283f8d6
TT		 1858 /*
1859 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1860 * can deal with.
1861 */
ff3525a5 1862 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1863 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1864 args->rsize = data->rsize;
1865 args->wsize = data->wsize;
2283f8d6
TT		 1866 args->timeo = data->timeo;
1867 args->retrans = data->retrans;
1868 args->acregmin = data->acregmin;
1869 args->acregmax = data->acregmax;
1870 args->acdirmin = data->acdirmin;
1871 args->acdirmax = data->acdirmax;
4c568017 1872
4cfd74fc 1873 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1874 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1875 if (!nfs_verify_server_address(sap))
4c568017
CL		 1876 goto out_no_address;
1877
2283f8d6 1878 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1879 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1880 /* N.B. caller will free nfs_server.hostname in all cases */
1881 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1882 args->namlen = data->namlen;
1883 args->bsize = data->bsize;
dd07c947
CL		 1884
1885 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1886 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1887 if (!args->nfs_server.hostname)
1888 goto out_nomem;
f9c3a380 1889
5eebde23
SJ		 1890 if (!(data->flags & NFS_MOUNT_NONLM))
1891 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1892 NFS_MOUNT_LOCAL_FCNTL);
1893 else
1894 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1895 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1896 /*
1897 * The legacy version 6 binary mount data from userspace has a
1898 * field used only to transport selinux information into the
1899 * the kernel. To continue to support that functionality we
1900 * have a touch of selinux knowledge here in the NFS code. The
1901 * userspace code converted context=blah to just blah so we are
1902 * converting back to the full string selinux understands.
1903 */
1904 if (data->context[0]){
1905#ifdef CONFIG_SECURITY_SELINUX
1906 int rc;
1907 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1908 if (!opts_str)
1909 return -ENOMEM;
1910 strcpy(opts_str, "context=");
1911 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1912 strcat(opts_str, &data->context[0]);
1913 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1914 kfree(opts_str);
1915 if (rc)
1916 return rc;
1917#else
1918 return -EINVAL;
1919#endif
1920 }
1921
5df36e78 1922 break;
136d558c 1923 default: {
136d558c 1924 int status;
136d558c 1925
2283f8d6
TT		 1926 if (nfs_parse_mount_options((char *)options, args) == 0)
1927 return -EINVAL;
136d558c 1928
4cfd74fc 1929 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1930 goto out_no_address;
1931
764302cc
CL		 1932 if (args->version == 4)
1933#ifdef CONFIG_NFS_V4
1934 return nfs4_validate_text_mount_data(options,
1935 args, dev_name);
1936#else
1937 goto out_v4_not_compiled;
1938#endif
1939
f5855fec 1940 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1941
259875ef
TM		 1942 nfs_set_mount_transport_protocol(args);
1943
dc045898
CL		 1944 status = nfs_parse_devname(dev_name,
1945 &args->nfs_server.hostname,
1946 PAGE_SIZE,
1947 &args->nfs_server.export_path,
1948 NFS_MAXPATHLEN);
1949 if (!status)
1950 status = nfs_try_mount(args, mntfh);
136d558c 1951
dc045898
CL		 1952 kfree(args->nfs_server.export_path);
1953 args->nfs_server.export_path = NULL;
136d558c 1954
136d558c 1955 if (status)
fdc6e2c8 1956 return status;
136d558c 1957
136d558c
CL		 1958 break;
1959 }
f7b422b1 1960 }
54ceac45
DH		 1961
1962#ifndef CONFIG_NFS_V3
8a6e5deb 1963 if (args->version == 3)
5df36e78
CL		 1964 goto out_v3_not_compiled;
1965#endif /* !CONFIG_NFS_V3 */
f7b422b1 1966
5df36e78 1967 return 0;
f7b422b1 1968
5df36e78
CL		 1969out_no_data:
1970 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1971 return -EINVAL;
54ceac45 1972
5df36e78
CL		 1973out_no_v3:
1974 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1975 data->version);
1976 return -EINVAL;
f7b422b1 1977
5df36e78
CL		 1978out_no_sec:
1979 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1980 return -EINVAL;
1981
5df36e78
CL		 1982#ifndef CONFIG_NFS_V3
1983out_v3_not_compiled:
1984 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1985 return -EPROTONOSUPPORT;
1986#endif /* !CONFIG_NFS_V3 */
1987
764302cc
CL		 1988#ifndef CONFIG_NFS_V4
1989out_v4_not_compiled:
1990 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1991 return -EPROTONOSUPPORT;
1992#endif /* !CONFIG_NFS_V4 */
1993
63649bd7
CG		 1994out_nomem:
1995 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1996 return -ENOMEM;
1997
5df36e78
CL		 1998out_no_address:
1999 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2000 return -EINVAL;
2001
2002out_invalid_fh:
2003 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2004 return -EINVAL;
f7b422b1
DH		 2005}
2006
48b605f8
JL		 2007static int
2008nfs_compare_remount_data(struct nfs_server *nfss,
2009 struct nfs_parsed_mount_data *data)
2010{
2011 if (data->flags != nfss->flags ||
2012 data->rsize != nfss->rsize ||
2013 data->wsize != nfss->wsize ||
2014 data->retrans != nfss->client->cl_timeout->to_retries ||
2015 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2016 data->acregmin != nfss->acregmin / HZ ||
2017 data->acregmax != nfss->acregmax / HZ ||
2018 data->acdirmin != nfss->acdirmin / HZ ||
2019 data->acdirmax != nfss->acdirmax / HZ ||
2020 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2021 data->nfs_server.port != nfss->port ||
48b605f8 2022 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2023 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2024 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2025 return -EINVAL;
2026
2027 return 0;
2028}
2029
2030static int
2031nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2032{
2033 int error;
2034 struct nfs_server *nfss = sb->s_fs_info;
2035 struct nfs_parsed_mount_data *data;
2036 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2037 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2038 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2039
2040 /*
2041 * Userspace mount programs that send binary options generally send
2042 * them populated with default values. We have no way to know which
2043 * ones were explicitly specified. Fall back to legacy behavior and
2044 * just return success.
2045 */
31c94469
MZ		 2046 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2047 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2048 options->version <= 6))))
48b605f8
JL		 2049 return 0;
2050
2051 data = kzalloc(sizeof(*data), GFP_KERNEL);
2052 if (data == NULL)
2053 return -ENOMEM;
2054
2055 /* fill out struct with values from existing mount */
2056 data->flags = nfss->flags;
2057 data->rsize = nfss->rsize;
2058 data->wsize = nfss->wsize;
2059 data->retrans = nfss->client->cl_timeout->to_retries;
2060 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2061 data->acregmin = nfss->acregmin / HZ;
2062 data->acregmax = nfss->acregmax / HZ;
2063 data->acdirmin = nfss->acdirmin / HZ;
2064 data->acdirmax = nfss->acdirmax / HZ;
2065 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2066 data->nfs_server.port = nfss->port;
48b605f8
JL		 2067 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2068 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2069 data->nfs_server.addrlen);
2070
2071 /* overwrite those values with any that were specified */
2072 error = nfs_parse_mount_options((char *)options, data);
2073 if (error < 0)
2074 goto out;
2075
26c4c170
JL		 2076 /*
2077 * noac is a special case. It implies -o sync, but that's not
2078 * necessarily reflected in the mtab options. do_remount_sb
2079 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2080 * remount options, so we have to explicitly reset it.
2081 */
2082 if (data->flags & NFS_MOUNT_NOAC)
2083 *flags |= MS_SYNCHRONOUS;
2084
48b605f8
JL		 2085 /* compare new mount options with old ones */
2086 error = nfs_compare_remount_data(nfss, data);
2087out:
2088 kfree(data);
2089 return error;
2090}
2091
f7b422b1 2092/*
54ceac45 2093 * Initialise the common bits of the superblock
f7b422b1 2094 */
54ceac45 2095static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2096{
54ceac45 2097 struct nfs_server *server = NFS_SB(sb);
5006a76c 2098
54ceac45 2099 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2100
54ceac45
DH		 2101 /* We probably want something more informative here */
2102 snprintf(sb->s_id, sizeof(sb->s_id),
2103 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2104
54ceac45
DH		 2105 if (sb->s_blocksize == 0)
2106 sb->s_blocksize = nfs_block_bits(server->wsize,
2107 &sb->s_blocksize_bits);
f7b422b1 2108
32a88aa1
JA		 2109 sb->s_bdi = &server->backing_dev_info;
2110
54ceac45 2111 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2112}
2113
2114/*
54ceac45 2115 * Finish setting up an NFS2/3 superblock
f7b422b1 2116 */
2283f8d6
TT		 2117static void nfs_fill_super(struct super_block *sb,
2118 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2119{
2120 struct nfs_server *server = NFS_SB(sb);
5006a76c 2121
54ceac45
DH		 2122 sb->s_blocksize_bits = 0;
2123 sb->s_blocksize = 0;
2124 if (data->bsize)
2125 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2126
8a6e5deb 2127 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2128 /* The VFS shouldn't apply the umask to mode bits. We will do
2129 * so ourselves when necessary.
2130 */
2131 sb->s_flags |= MS_POSIXACL;
2132 sb->s_time_gran = 1;
816724e6 2133 }
54ceac45
DH		 2134
2135 sb->s_op = &nfs_sops;
2136 nfs_initialise_sb(sb);
f7b422b1
DH		 2137}
2138
2139/*
54ceac45 2140 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2141 */
54ceac45
DH		 2142static void nfs_clone_super(struct super_block *sb,
2143 const struct super_block *old_sb)
f7b422b1 2144{
54ceac45
DH		 2145 struct nfs_server *server = NFS_SB(sb);
2146
2147 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2148 sb->s_blocksize = old_sb->s_blocksize;
2149 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2150
8a6e5deb 2151 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2152 /* The VFS shouldn't apply the umask to mode bits. We will do
2153 * so ourselves when necessary.
f7b422b1
DH		 2154 */
2155 sb->s_flags |= MS_POSIXACL;
f7b422b1 2156 sb->s_time_gran = 1;
f7b422b1
DH		 2157 }
2158
54ceac45
DH		 2159 sb->s_op = old_sb->s_op;
2160 nfs_initialise_sb(sb);
f7b422b1
DH		 2161}
2162
275a5d24
TM		 2163static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2164{
2165 const struct nfs_server *a = s->s_fs_info;
2166 const struct rpc_clnt *clnt_a = a->client;
2167 const struct rpc_clnt *clnt_b = b->client;
2168
2169 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2170 goto Ebusy;
2171 if (a->nfs_client != b->nfs_client)
2172 goto Ebusy;
2173 if (a->flags != b->flags)
2174 goto Ebusy;
2175 if (a->wsize != b->wsize)
2176 goto Ebusy;
2177 if (a->rsize != b->rsize)
2178 goto Ebusy;
2179 if (a->acregmin != b->acregmin)
2180 goto Ebusy;
2181 if (a->acregmax != b->acregmax)
2182 goto Ebusy;
2183 if (a->acdirmin != b->acdirmin)
2184 goto Ebusy;
2185 if (a->acdirmax != b->acdirmax)
2186 goto Ebusy;
2187 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2188 goto Ebusy;
e89a5a43 2189 return 1;
275a5d24 2190Ebusy:
e89a5a43
TM		 2191 return 0;
2192}
2193
2194struct nfs_sb_mountdata {
2195 struct nfs_server *server;
2196 int mntflags;
2197};
2198
2199static int nfs_set_super(struct super_block *s, void *data)
2200{
2201 struct nfs_sb_mountdata *sb_mntdata = data;
2202 struct nfs_server *server = sb_mntdata->server;
2203 int ret;
2204
2205 s->s_flags = sb_mntdata->mntflags;
2206 s->s_fs_info = server;
8b244ff2 2207 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2208 ret = set_anon_super(s, server);
2209 if (ret == 0)
2210 server->s_dev = s->s_dev;
2211 return ret;
2212}
2213
fd00a8ff
CL		 2214static int nfs_compare_super_address(struct nfs_server *server1,
2215 struct nfs_server *server2)
2216{
2217 struct sockaddr *sap1, *sap2;
2218
2219 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2220 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2221
2222 if (sap1->sa_family != sap2->sa_family)
2223 return 0;
2224
2225 switch (sap1->sa_family) {
2226 case AF_INET: {
2227 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2228 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2229 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2230 return 0;
2231 if (sin1->sin_port != sin2->sin_port)
2232 return 0;
2233 break;
2234 }
2235 case AF_INET6: {
2236 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2237 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2238 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2239 return 0;
2240 if (sin1->sin6_port != sin2->sin6_port)
2241 return 0;
2242 break;
2243 }
2244 default:
2245 return 0;
2246 }
2247
2248 return 1;
2249}
2250
e89a5a43
TM		 2251static int nfs_compare_super(struct super_block *sb, void *data)
2252{
2253 struct nfs_sb_mountdata *sb_mntdata = data;
2254 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2255 int mntflags = sb_mntdata->mntflags;
2256
fd00a8ff 2257 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2258 return 0;
2259 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2260 if (old->flags & NFS_MOUNT_UNSHARED)
2261 return 0;
2262 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2263 return 0;
2264 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2265}
2266
fa799759
MS		 2267static int nfs_bdi_register(struct nfs_server *server)
2268{
2269 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2270}
2271
01194981
AV		 2272static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2273 int flags, const char *dev_name, void *raw_data)
f7b422b1 2274{
f7b422b1
DH		 2275 struct nfs_server *server = NULL;
2276 struct super_block *s;
33852a1f
TM		 2277 struct nfs_parsed_mount_data *data;
2278 struct nfs_fh *mntfh;
01194981 2279 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2280 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2281 struct nfs_sb_mountdata sb_mntdata = {
2282 .mntflags = flags,
2283 };
01194981 2284 int error;
33852a1f 2285
1e657bd5 2286 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2287 mntfh = nfs_alloc_fhandle();
33852a1f 2288 if (data == NULL || mntfh == NULL)
8a0d551a 2289 goto out;
f9c3a380 2290
54ceac45 2291 /* Validate the mount data */
33852a1f 2292 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2293 if (error < 0) {
2294 mntroot = ERR_PTR(error);
0655960f 2295 goto out;
01194981 2296 }
f7b422b1 2297
764302cc
CL		 2298#ifdef CONFIG_NFS_V4
2299 if (data->version == 4) {
01194981 2300 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2301 goto out;
2302 }
2303#endif /* CONFIG_NFS_V4 */
2304
54ceac45 2305 /* Get a volume representation */
33852a1f 2306 server = nfs_create_server(data, mntfh);
54ceac45 2307 if (IS_ERR(server)) {
01194981 2308 mntroot = ERR_CAST(server);
0655960f 2309 goto out;
f7b422b1 2310 }
e89a5a43 2311 sb_mntdata.server = server;
f7b422b1 2312
75180df2
TM		 2313 if (server->flags & NFS_MOUNT_UNSHARED)
2314 compare_super = NULL;
2315
fb2088cc
SP		 2316 /* -o noac implies -o sync */
2317 if (server->flags & NFS_MOUNT_NOAC)
2318 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2319
54ceac45 2320 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2321 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2322 if (IS_ERR(s)) {
01194981 2323 mntroot = ERR_CAST(s);
54ceac45 2324 goto out_err_nosb;
816724e6
TM		 2325 }
2326
54ceac45
DH		 2327 if (s->s_fs_info != server) {
2328 nfs_free_server(server);
2329 server = NULL;
fa799759
MS		 2330 } else {
2331 error = nfs_bdi_register(server);
01194981
AV		 2332 if (error) {
2333 mntroot = ERR_PTR(error);
cfbc0683 2334 goto error_splat_bdi;
01194981 2335 }
54ceac45 2336 }
f7b422b1 2337
54ceac45
DH		 2338 if (!s->s_root) {
2339 /* initial superblock/root creation */
33852a1f 2340 nfs_fill_super(s, data);
160bc160 2341 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2342 }
f7b422b1 2343
0d5839ad 2344 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2345 if (IS_ERR(mntroot))
54ceac45 2346 goto error_splat_super;
816724e6 2347
33852a1f 2348 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2349 if (error)
2350 goto error_splat_root;
2351
54ceac45 2352 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2353
2354out:
8a0d551a 2355 nfs_free_parsed_mount_data(data);
b157b06c 2356 nfs_free_fhandle(mntfh);
01194981 2357 return mntroot;
816724e6 2358
54ceac45
DH		 2359out_err_nosb:
2360 nfs_free_server(server);
0655960f 2361 goto out;
54ceac45 2362
f9c3a380
EP		 2363error_splat_root:
2364 dput(mntroot);
01194981 2365 mntroot = ERR_PTR(error);
54ceac45 2366error_splat_super:
cfbc0683
N		 2367 if (server && !s->s_root)
2368 bdi_unregister(&server->backing_dev_info);
2369error_splat_bdi:
6f5bbff9 2370 deactivate_locked_super(s);
0655960f 2371 goto out;
f7b422b1
DH		 2372}
2373
387c149b
TM		 2374/*
2375 * Ensure that we unregister the bdi before kill_anon_super
2376 * releases the device name
2377 */
2378static void nfs_put_super(struct super_block *s)
2379{
2380 struct nfs_server *server = NFS_SB(s);
2381
2382 bdi_unregister(&server->backing_dev_info);
2383}
2384
54ceac45
DH		 2385/*
2386 * Destroy an NFS2/3 superblock
2387 */
f7b422b1
DH		 2388static void nfs_kill_super(struct super_block *s)
2389{
2390 struct nfs_server *server = NFS_SB(s);
2391
2392 kill_anon_super(s);
08734048 2393 nfs_fscache_release_super_cookie(s);
54ceac45 2394 nfs_free_server(server);
f7b422b1
DH		 2395}
2396
54ceac45
DH		 2397/*
2398 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2399 */
31f43471
AV		 2400static struct dentry *
2401nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2402 const char *dev_name, void *raw_data)
f7b422b1
DH		 2403{
2404 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2405 struct super_block *s;
2406 struct nfs_server *server;
2407 struct dentry *mntroot;
75180df2 2408 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2409 struct nfs_sb_mountdata sb_mntdata = {
2410 .mntflags = flags,
2411 };
54ceac45 2412 int error;
f7b422b1 2413
31f43471 2414 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2415
54ceac45
DH		 2416 /* create a new volume representation */
2417 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2418 if (IS_ERR(server)) {
2419 error = PTR_ERR(server);
2420 goto out_err_noserver;
2421 }
e89a5a43 2422 sb_mntdata.server = server;
8fa5c000 2423
75180df2
TM		 2424 if (server->flags & NFS_MOUNT_UNSHARED)
2425 compare_super = NULL;
2426
fb2088cc
SP		 2427 /* -o noac implies -o sync */
2428 if (server->flags & NFS_MOUNT_NOAC)
2429 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2430
54ceac45 2431 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2432 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2433 if (IS_ERR(s)) {
2434 error = PTR_ERR(s);
2435 goto out_err_nosb;
2436 }
5006a76c 2437
54ceac45
DH		 2438 if (s->s_fs_info != server) {
2439 nfs_free_server(server);
2440 server = NULL;
fa799759
MS		 2441 } else {
2442 error = nfs_bdi_register(server);
2443 if (error)
cfbc0683 2444 goto error_splat_bdi;
f7b422b1 2445 }
24c8dbbb 2446
54ceac45
DH		 2447 if (!s->s_root) {
2448 /* initial superblock/root creation */
54ceac45 2449 nfs_clone_super(s, data->sb);
2df54806 2450 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2451 }
f7b422b1 2452
0d5839ad 2453 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2454 if (IS_ERR(mntroot)) {
2455 error = PTR_ERR(mntroot);
2456 goto error_splat_super;
f7b422b1 2457 }
e9cc6c23 2458 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2459 dput(mntroot);
2460 error = -ESTALE;
2461 goto error_splat_super;
2462 }
f7b422b1 2463
54ceac45 2464 s->s_flags |= MS_ACTIVE;
f7b422b1 2465
f9c3a380
EP		 2466 /* clone any lsm security options from the parent to the new sb */
2467 security_sb_clone_mnt_opts(data->sb, s);
2468
31f43471
AV		 2469 dprintk("<-- nfs_xdev_mount() = 0\n");
2470 return mntroot;
24c8dbbb 2471
54ceac45
DH		 2472out_err_nosb:
2473 nfs_free_server(server);
2474out_err_noserver:
31f43471
AV		 2475 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2476 return ERR_PTR(error);
f7b422b1 2477
54ceac45 2478error_splat_super:
cfbc0683
N		 2479 if (server && !s->s_root)
2480 bdi_unregister(&server->backing_dev_info);
2481error_splat_bdi:
6f5bbff9 2482 deactivate_locked_super(s);
31f43471
AV		 2483 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2484 return ERR_PTR(error);
f7b422b1
DH		 2485}
2486
54ceac45
DH		 2487#ifdef CONFIG_NFS_V4
2488
f7b422b1 2489/*
54ceac45 2490 * Finish setting up a cloned NFS4 superblock
f7b422b1 2491 */
54ceac45
DH		 2492static void nfs4_clone_super(struct super_block *sb,
2493 const struct super_block *old_sb)
f7b422b1 2494{
54ceac45
DH		 2495 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2496 sb->s_blocksize = old_sb->s_blocksize;
2497 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2498 sb->s_time_gran = 1;
54ceac45 2499 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2500 /*
2501 * The VFS shouldn't apply the umask to mode bits. We will do
2502 * so ourselves when necessary.
2503 */
2504 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2505 sb->s_xattr = old_sb->s_xattr;
2506 nfs_initialise_sb(sb);
f7b422b1
DH		 2507}
2508
54ceac45
DH		 2509/*
2510 * Set up an NFS4 superblock
2511 */
2512static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2513{
54ceac45
DH		 2514 sb->s_time_gran = 1;
2515 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2516 /*
2517 * The VFS shouldn't apply the umask to mode bits. We will do
2518 * so ourselves when necessary.
2519 */
2520 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2521 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2522 nfs_initialise_sb(sb);
f7b422b1
DH		 2523}
2524
01c3f052
TM		 2525static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2526{
5eebde23
SJ		 2527 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2528 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2529}
2530
7630c852
CL		 2531static int nfs4_validate_text_mount_data(void *options,
2532 struct nfs_parsed_mount_data *args,
2533 const char *dev_name)
2534{
2535 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2536
f5855fec 2537 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2538
2539 nfs_validate_transport_protocol(args);
2540
2541 nfs4_validate_mount_flags(args);
2542
2ecda72b
TM		 2543 if (args->version != 4) {
2544 dfprintk(MOUNT,
2545 "NFS4: Illegal mount version\n");
2546 return -EINVAL;
2547 }
2548
7630c852
CL		 2549 if (args->auth_flavor_len > 1) {
2550 dfprintk(MOUNT,
2551 "NFS4: Too many RPC auth flavours specified\n");
2552 return -EINVAL;
2553 }
2554
2555 if (args->client_address == NULL) {
2556 dfprintk(MOUNT,
2557 "NFS4: mount program didn't pass callback address\n");
2558 return -EINVAL;
2559 }
2560
2561 return nfs_parse_devname(dev_name,
2562 &args->nfs_server.hostname,
2563 NFS4_MAXNAMLEN,
2564 &args->nfs_server.export_path,
2565 NFS4_MAXPATHLEN);
2566}
2567
f0768ebd
CL		 2568/*
2569 * Validate NFSv4 mount options
2570 */
91ea40b9
TT		 2571static int nfs4_validate_mount_data(void *options,
2572 struct nfs_parsed_mount_data *args,
2573 const char *dev_name)
f0768ebd 2574{
4cfd74fc 2575 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2576 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2577 char *c;
2578
2579 if (data == NULL)
2580 goto out_no_data;
2581
2582 switch (data->version) {
2583 case 1:
4c568017
CL		 2584 if (data->host_addrlen > sizeof(args->nfs_server.address))
2585 goto out_no_address;
2586 if (data->host_addrlen == 0)
f0768ebd 2587 goto out_no_address;
4c568017 2588 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2589 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2590 return -EFAULT;
4cfd74fc 2591 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2592 goto out_no_address;
2593
6738b251
CL		 2594 if (data->auth_flavourlen) {
2595 if (data->auth_flavourlen > 1)
2596 goto out_inval_auth;
20c71f5e 2597 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2598 data->auth_flavours,
20c71f5e 2599 sizeof(args->auth_flavors[0])))
f0768ebd 2600 return -EFAULT;
f0768ebd
CL		 2601 }
2602
2603 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2604 if (IS_ERR(c))
2605 return PTR_ERR(c);
91ea40b9 2606 args->nfs_server.hostname = c;
f0768ebd
CL		 2607
2608 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2609 if (IS_ERR(c))
2610 return PTR_ERR(c);
91ea40b9
TT		 2611 args->nfs_server.export_path = c;
2612 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2613
2614 c = strndup_user(data->client_addr.data, 16);
2615 if (IS_ERR(c))
2616 return PTR_ERR(c);
91ea40b9
TT		 2617 args->client_address = c;
2618
2619 /*
2620 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2621 * can deal with.
2622 */
2623
2624 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2625 args->rsize = data->rsize;
2626 args->wsize = data->wsize;
2627 args->timeo = data->timeo;
2628 args->retrans = data->retrans;
2629 args->acregmin = data->acregmin;
2630 args->acregmax = data->acregmax;
2631 args->acdirmin = data->acdirmin;
2632 args->acdirmax = data->acdirmax;
2633 args->nfs_server.protocol = data->proto;
259875ef 2634 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2635
2636 break;
7630c852 2637 default:
91ea40b9 2638 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2639 return -EINVAL;
2640
4cfd74fc 2641 if (!nfs_verify_server_address(sap))
80071225 2642 return -EINVAL;
dc045898 2643
7630c852 2644 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2645 }
2646
2647 return 0;
2648
2649out_no_data:
2650 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2651 return -EINVAL;
2652
2653out_inval_auth:
2654 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2655 data->auth_flavourlen);
2656 return -EINVAL;
2657
2658out_no_address:
2659 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2660 return -EINVAL;
f0768ebd
CL		 2661}
2662
54ceac45 2663/*
c02d7adf 2664 * Get the superblock for the NFS4 root partition
54ceac45 2665 */
31f43471
AV		 2666static struct dentry *
2667nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2668 const char *dev_name, void *raw_data)
f7b422b1 2669{
c02d7adf 2670 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2671 struct super_block *s;
2672 struct nfs_server *server;
33852a1f 2673 struct nfs_fh *mntfh;
54ceac45 2674 struct dentry *mntroot;
75180df2 2675 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2676 struct nfs_sb_mountdata sb_mntdata = {
2677 .mntflags = flags,
2678 };
33852a1f
TM		 2679 int error = -ENOMEM;
2680
b157b06c 2681 mntfh = nfs_alloc_fhandle();
33852a1f 2682 if (data == NULL || mntfh == NULL)
8a0d551a 2683 goto out;
f9c3a380 2684
54ceac45 2685 /* Get a volume representation */
33852a1f 2686 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2687 if (IS_ERR(server)) {
2688 error = PTR_ERR(server);
29eb981a 2689 goto out;
f7b422b1 2690 }
e89a5a43 2691 sb_mntdata.server = server;
f7b422b1 2692
75180df2
TM		 2693 if (server->flags & NFS4_MOUNT_UNSHARED)
2694 compare_super = NULL;
2695
fb2088cc
SP		 2696 /* -o noac implies -o sync */
2697 if (server->flags & NFS_MOUNT_NOAC)
2698 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2699
54ceac45 2700 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2701 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2702 if (IS_ERR(s)) {
2703 error = PTR_ERR(s);
f7b422b1 2704 goto out_free;
816724e6
TM		 2705 }
2706
5dd3177a
TM		 2707 if (s->s_fs_info != server) {
2708 nfs_free_server(server);
2709 server = NULL;
fa799759
MS		 2710 } else {
2711 error = nfs_bdi_register(server);
2712 if (error)
cfbc0683 2713 goto error_splat_bdi;
5dd3177a
TM		 2714 }
2715
54ceac45
DH		 2716 if (!s->s_root) {
2717 /* initial superblock/root creation */
54ceac45 2718 nfs4_fill_super(s);
c15c928f 2719 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2720 }
f7b422b1 2721
0d5839ad 2722 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2723 if (IS_ERR(mntroot)) {
2724 error = PTR_ERR(mntroot);
2725 goto error_splat_super;
f7b422b1 2726 }
54ceac45 2727
33852a1f 2728 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2729 if (error)
2730 goto error_splat_root;
2731
f7b422b1 2732 s->s_flags |= MS_ACTIVE;
31f43471 2733
31f43471
AV		 2734 nfs_free_fhandle(mntfh);
2735 return mntroot;
29eb981a
CL		 2736
2737out:
b157b06c 2738 nfs_free_fhandle(mntfh);
31f43471 2739 return ERR_PTR(error);
54ceac45 2740
f7b422b1 2741out_free:
54ceac45 2742 nfs_free_server(server);
29eb981a 2743 goto out;
54ceac45 2744
46c8ac74
EP		 2745error_splat_root:
2746 dput(mntroot);
54ceac45 2747error_splat_super:
cfbc0683
N		 2748 if (server && !s->s_root)
2749 bdi_unregister(&server->backing_dev_info);
2750error_splat_bdi:
6f5bbff9 2751 deactivate_locked_super(s);
29eb981a 2752 goto out;
f7b422b1
DH		 2753}
2754
c02d7adf
TM		 2755static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2756 int flags, void *data, const char *hostname)
2757{
2758 struct vfsmount *root_mnt;
2759 char *root_devname;
2760 size_t len;
2761
2762 len = strlen(hostname) + 3;
2763 root_devname = kmalloc(len, GFP_KERNEL);
2764 if (root_devname == NULL)
2765 return ERR_PTR(-ENOMEM);
2766 snprintf(root_devname, len, "%s:/", hostname);
2767 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2768 kfree(root_devname);
2769 return root_mnt;
2770}
2771
ce587e07
TM		 2772struct nfs_referral_count {
2773 struct list_head list;
2774 const struct task_struct *task;
2775 unsigned int referral_count;
2776};
2777
2778static LIST_HEAD(nfs_referral_count_list);
2779static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2780
2781static struct nfs_referral_count *nfs_find_referral_count(void)
2782{
2783 struct nfs_referral_count *p;
2784
2785 list_for_each_entry(p, &nfs_referral_count_list, list) {
2786 if (p->task == current)
2787 return p;
2788 }
2789 return NULL;
2790}
2791
2792#define NFS_MAX_NESTED_REFERRALS 2
2793
2794static int nfs_referral_loop_protect(void)
2795{
2796 struct nfs_referral_count *p, *new;
2797 int ret = -ENOMEM;
2798
2799 new = kmalloc(sizeof(*new), GFP_KERNEL);
2800 if (!new)
2801 goto out;
2802 new->task = current;
2803 new->referral_count = 1;
2804
2805 ret = 0;
2806 spin_lock(&nfs_referral_count_list_lock);
2807 p = nfs_find_referral_count();
2808 if (p != NULL) {
2809 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2810 ret = -ELOOP;
2811 else
2812 p->referral_count++;
2813 } else {
2814 list_add(&new->list, &nfs_referral_count_list);
2815 new = NULL;
2816 }
2817 spin_unlock(&nfs_referral_count_list_lock);
2818 kfree(new);
2819out:
2820 return ret;
2821}
2822
2823static void nfs_referral_loop_unprotect(void)
2824{
2825 struct nfs_referral_count *p;
2826
2827 spin_lock(&nfs_referral_count_list_lock);
2828 p = nfs_find_referral_count();
2829 p->referral_count--;
2830 if (p->referral_count == 0)
2831 list_del(&p->list);
2832 else
2833 p = NULL;
2834 spin_unlock(&nfs_referral_count_list_lock);
2835 kfree(p);
2836}
2837
01194981
AV		 2838static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2839 const char *export_path)
c02d7adf 2840{
01194981 2841 struct dentry *dentry;
5352d3b6 2842 int err;
c02d7adf 2843
5352d3b6
AV		 2844 if (IS_ERR(root_mnt))
2845 return ERR_CAST(root_mnt);
2846
2847 err = nfs_referral_loop_protect();
2848 if (err) {
ea441d11 2849 mntput(root_mnt);
5352d3b6 2850 return ERR_PTR(err);
ea441d11 2851 }
c02d7adf 2852
ea441d11
AV		 2853 dentry = mount_subtree(root_mnt, export_path);
2854 nfs_referral_loop_unprotect();
c02d7adf 2855
01194981 2856 return dentry;
c02d7adf
TM		 2857}
2858
01194981
AV		 2859static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2860 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2861{
2862 char *export_path;
2863 struct vfsmount *root_mnt;
01194981 2864 struct dentry *res;
a6fe23be
CL		 2865
2866 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2867
2868 export_path = data->nfs_server.export_path;
2869 data->nfs_server.export_path = "/";
2870 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2871 data->nfs_server.hostname);
2872 data->nfs_server.export_path = export_path;
2873
5352d3b6 2874 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2875
01194981
AV		 2876 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2877 IS_ERR(res) ? PTR_ERR(res) : 0,
2878 IS_ERR(res) ? " [error]" : "");
2879 return res;
a6fe23be
CL		 2880}
2881
c02d7adf
TM		 2882/*
2883 * Get the superblock for an NFS4 mountpoint
2884 */
01194981
AV		 2885static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2886 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2887{
2888 struct nfs_parsed_mount_data *data;
c02d7adf 2889 int error = -ENOMEM;
01194981 2890 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2891
c5811dbd 2892 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2893 if (data == NULL)
8a0d551a 2894 goto out;
c02d7adf
TM		 2895
2896 /* Validate the mount data */
2897 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2898 if (error < 0) {
2899 res = ERR_PTR(error);
c02d7adf 2900 goto out;
01194981 2901 }
c02d7adf 2902
01194981
AV		 2903 res = nfs4_try_mount(flags, dev_name, data);
2904 if (IS_ERR(res))
2905 error = PTR_ERR(res);
c02d7adf
TM		 2906
2907out:
8a0d551a 2908 nfs_free_parsed_mount_data(data);
01194981 2909 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2910 error != 0 ? " [error]" : "");
01194981 2911 return res;
c02d7adf
TM		 2912}
2913
f7b422b1
DH		 2914static void nfs4_kill_super(struct super_block *sb)
2915{
2916 struct nfs_server *server = NFS_SB(sb);
2917
0f3e66c6 2918 dprintk("--> %s\n", __func__);
515d8611 2919 nfs_super_return_all_delegations(sb);
f7b422b1 2920 kill_anon_super(sb);
08734048 2921 nfs_fscache_release_super_cookie(sb);
54ceac45 2922 nfs_free_server(server);
0f3e66c6 2923 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2924}
2925
2926/*
54ceac45 2927 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2928 */
31f43471
AV		 2929static struct dentry *
2930nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2931 const char *dev_name, void *raw_data)
f7b422b1 2932{
54ceac45
DH		 2933 struct nfs_clone_mount *data = raw_data;
2934 struct super_block *s;
2935 struct nfs_server *server;
2936 struct dentry *mntroot;
75180df2 2937 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2938 struct nfs_sb_mountdata sb_mntdata = {
2939 .mntflags = flags,
2940 };
54ceac45 2941 int error;
f7b422b1 2942
31f43471 2943 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2944
54ceac45
DH		 2945 /* create a new volume representation */
2946 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2947 if (IS_ERR(server)) {
2948 error = PTR_ERR(server);
2949 goto out_err_noserver;
f7b422b1 2950 }
e89a5a43 2951 sb_mntdata.server = server;
f7b422b1 2952
75180df2
TM		 2953 if (server->flags & NFS4_MOUNT_UNSHARED)
2954 compare_super = NULL;
2955
fb2088cc
SP		 2956 /* -o noac implies -o sync */
2957 if (server->flags & NFS_MOUNT_NOAC)
2958 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2959
54ceac45 2960 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2961 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2962 if (IS_ERR(s)) {
2963 error = PTR_ERR(s);
2964 goto out_err_nosb;
f7b422b1 2965 }
f7b422b1 2966
54ceac45
DH		 2967 if (s->s_fs_info != server) {
2968 nfs_free_server(server);
2969 server = NULL;
fa799759
MS		 2970 } else {
2971 error = nfs_bdi_register(server);
2972 if (error)
cfbc0683 2973 goto error_splat_bdi;
54ceac45 2974 }
f7b422b1 2975
54ceac45
DH		 2976 if (!s->s_root) {
2977 /* initial superblock/root creation */
54ceac45 2978 nfs4_clone_super(s, data->sb);
2df54806 2979 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2980 }
f7b422b1 2981
0d5839ad 2982 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 2983 if (IS_ERR(mntroot)) {
2984 error = PTR_ERR(mntroot);
2985 goto error_splat_super;
2986 }
e9cc6c23
TM		 2987 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2988 dput(mntroot);
2989 error = -ESTALE;
2990 goto error_splat_super;
2991 }
f7b422b1 2992
54ceac45 2993 s->s_flags |= MS_ACTIVE;
54ceac45 2994
46c8ac74
EP		 2995 security_sb_clone_mnt_opts(data->sb, s);
2996
31f43471
AV		 2997 dprintk("<-- nfs4_xdev_mount() = 0\n");
2998 return mntroot;
54ceac45
DH		 2999
3000out_err_nosb:
3001 nfs_free_server(server);
3002out_err_noserver:
31f43471
AV		 3003 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3004 return ERR_PTR(error);
54ceac45
DH		 3005
3006error_splat_super:
cfbc0683
N		 3007 if (server && !s->s_root)
3008 bdi_unregister(&server->backing_dev_info);
3009error_splat_bdi:
6f5bbff9 3010 deactivate_locked_super(s);
31f43471
AV		 3011 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3012 return ERR_PTR(error);
f7b422b1
DH		 3013}
3014
31f43471
AV		 3015static struct dentry *
3016nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3017 const char *dev_name, void *raw_data)
f7b422b1
DH		 3018{
3019 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3020 struct super_block *s;
3021 struct nfs_server *server;
3022 struct dentry *mntroot;
4f727296 3023 struct nfs_fh *mntfh;
75180df2 3024 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3025 struct nfs_sb_mountdata sb_mntdata = {
3026 .mntflags = flags,
3027 };
4f727296 3028 int error = -ENOMEM;
54ceac45
DH		 3029
3030 dprintk("--> nfs4_referral_get_sb()\n");
3031
4f727296
TM		 3032 mntfh = nfs_alloc_fhandle();
3033 if (mntfh == NULL)
3034 goto out_err_nofh;
3035
54ceac45 3036 /* create a new volume representation */
4f727296 3037 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3038 if (IS_ERR(server)) {
3039 error = PTR_ERR(server);
3040 goto out_err_noserver;
3041 }
e89a5a43 3042 sb_mntdata.server = server;
54ceac45 3043
75180df2
TM		 3044 if (server->flags & NFS4_MOUNT_UNSHARED)
3045 compare_super = NULL;
3046
fb2088cc
SP		 3047 /* -o noac implies -o sync */
3048 if (server->flags & NFS_MOUNT_NOAC)
3049 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3050
54ceac45 3051 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3052 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3053 if (IS_ERR(s)) {
3054 error = PTR_ERR(s);
3055 goto out_err_nosb;
3056 }
3057
3058 if (s->s_fs_info != server) {
3059 nfs_free_server(server);
3060 server = NULL;
fa799759
MS		 3061 } else {
3062 error = nfs_bdi_register(server);
3063 if (error)
cfbc0683 3064 goto error_splat_bdi;
54ceac45
DH		 3065 }
3066
3067 if (!s->s_root) {
3068 /* initial superblock/root creation */
54ceac45 3069 nfs4_fill_super(s);
2df54806 3070 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3071 }
3072
0d5839ad 3073 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3074 if (IS_ERR(mntroot)) {
3075 error = PTR_ERR(mntroot);
3076 goto error_splat_super;
3077 }
e9cc6c23
TM		 3078 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3079 dput(mntroot);
3080 error = -ESTALE;
3081 goto error_splat_super;
3082 }
54ceac45
DH		 3083
3084 s->s_flags |= MS_ACTIVE;
54ceac45 3085
46c8ac74
EP		 3086 security_sb_clone_mnt_opts(data->sb, s);
3087
4f727296 3088 nfs_free_fhandle(mntfh);
54ceac45 3089 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3090 return mntroot;
54ceac45
DH		 3091
3092out_err_nosb:
3093 nfs_free_server(server);
3094out_err_noserver:
4f727296
TM		 3095 nfs_free_fhandle(mntfh);
3096out_err_nofh:
54ceac45 3097 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3098 return ERR_PTR(error);
54ceac45
DH		 3099
3100error_splat_super:
cfbc0683
N		 3101 if (server && !s->s_root)
3102 bdi_unregister(&server->backing_dev_info);
3103error_splat_bdi:
6f5bbff9 3104 deactivate_locked_super(s);
4f727296 3105 nfs_free_fhandle(mntfh);
54ceac45 3106 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3107 return ERR_PTR(error);
f7b422b1
DH		 3108}
3109
c02d7adf
TM		 3110/*
3111 * Create an NFS4 server record on referral traversal
3112 */
01194981
AV		 3113static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3114 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3115{
3116 struct nfs_clone_mount *data = raw_data;
3117 char *export_path;
3118 struct vfsmount *root_mnt;
01194981 3119 struct dentry *res;
c02d7adf 3120
01194981 3121 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3122
3123 export_path = data->mnt_path;
3124 data->mnt_path = "/";
3125
3126 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3127 flags, data, data->hostname);
3128 data->mnt_path = export_path;
3129
5352d3b6 3130 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3131 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3132 IS_ERR(res) ? PTR_ERR(res) : 0,
3133 IS_ERR(res) ? " [error]" : "");
3134 return res;
c02d7adf
TM		 3135}
3136
54ceac45 3137#endif /* CONFIG_NFS_V4 */
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