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SUNRPC: Ensure that we can trace waitqueues when !defined(CONFIG_SYSCTL)
[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,
7ced286e 83 Opt_v2, Opt_v3, Opt_v4, Opt_v4_0, Opt_v4_1,
2cf7ff7a 84 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
75180df2 87 Opt_sharecache, Opt_nosharecache,
d740351b 88 Opt_resvport, Opt_noresvport,
b797cac7 89 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
e887cbcf 100 Opt_mountvers,
ad879cef 101 Opt_nfsvers,
3fd5be9e 102 Opt_minorversion,
bf0fd768
CL		 103
104 /* Mount options that take string arguments */
33832034 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 107 Opt_lookupcache,
b797cac7 108 Opt_fscache_uniq,
5eebde23 109 Opt_local_lock,
bf0fd768 110
f45663ce
CL		 111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 113
114 Opt_err
115};
116
a447c093 117static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
ecbb3845
CL		 120 { Opt_userspace, "retry=%s" },
121
f45663ce
CL		 122 { Opt_sloppy, "sloppy" },
123
bf0fd768
CL		 124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
d33e4dfe
CL		 126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
bf0fd768
CL		 128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
764302cc 138 { Opt_v4, "v4" },
7ced286e
WAA		 139 { Opt_v4_0, "v4.0" },
140 { Opt_v4_1, "v4.1" },
bf0fd768
CL		 141 { Opt_udp, "udp" },
142 { Opt_tcp, "tcp" },
2cf7ff7a 143 { Opt_rdma, "rdma" },
bf0fd768
CL		 144 { Opt_acl, "acl" },
145 { Opt_noacl, "noacl" },
146 { Opt_rdirplus, "rdirplus" },
147 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 148 { Opt_sharecache, "sharecache" },
149 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 150 { Opt_resvport, "resvport" },
151 { Opt_noresvport, "noresvport" },
b797cac7 152 { Opt_fscache, "fsc" },
b797cac7 153 { Opt_nofscache, "nofsc" },
bf0fd768 154
a5a16bae
CL		 155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
169 { Opt_nfsvers, "nfsvers=%s" },
170 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 171 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 172
173 { Opt_sec, "sec=%s" },
174 { Opt_proto, "proto=%s" },
175 { Opt_mountproto, "mountproto=%s" },
176 { Opt_addr, "addr=%s" },
177 { Opt_clientaddr, "clientaddr=%s" },
33832034 178 { Opt_mounthost, "mounthost=%s" },
0ac83779 179 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 180
7973c1f1 181 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 182 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 183 { Opt_local_lock, "local_lock=%s" },
7973c1f1 184
bf0fd768
CL		 185 { Opt_err, NULL }
186};
187
188enum {
ee671b01 189 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 190
191 Opt_xprt_err
192};
193
a447c093 194static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 195 { Opt_xprt_udp, "udp" },
ee671b01 196 { Opt_xprt_udp6, "udp6" },
bf0fd768 197 { Opt_xprt_tcp, "tcp" },
ee671b01 198 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 199 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 200
201 { Opt_xprt_err, NULL }
202};
203
204enum {
205 Opt_sec_none, Opt_sec_sys,
206 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
207 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
208 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
209
210 Opt_sec_err
211};
212
a447c093 213static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 214 { Opt_sec_none, "none" },
215 { Opt_sec_none, "null" },
216 { Opt_sec_sys, "sys" },
217
218 { Opt_sec_krb5, "krb5" },
219 { Opt_sec_krb5i, "krb5i" },
220 { Opt_sec_krb5p, "krb5p" },
221
222 { Opt_sec_lkey, "lkey" },
223 { Opt_sec_lkeyi, "lkeyi" },
224 { Opt_sec_lkeyp, "lkeyp" },
225
8d042218
OK		 226 { Opt_sec_spkm, "spkm3" },
227 { Opt_sec_spkmi, "spkm3i" },
228 { Opt_sec_spkmp, "spkm3p" },
229
bf0fd768
CL		 230 { Opt_sec_err, NULL }
231};
232
7973c1f1
TM		 233enum {
234 Opt_lookupcache_all, Opt_lookupcache_positive,
235 Opt_lookupcache_none,
236
237 Opt_lookupcache_err
238};
239
240static match_table_t nfs_lookupcache_tokens = {
241 { Opt_lookupcache_all, "all" },
242 { Opt_lookupcache_positive, "pos" },
243 { Opt_lookupcache_positive, "positive" },
244 { Opt_lookupcache_none, "none" },
245
246 { Opt_lookupcache_err, NULL }
247};
248
5eebde23
SJ		 249enum {
250 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
251 Opt_local_lock_none,
252
253 Opt_local_lock_err
254};
255
256static match_table_t nfs_local_lock_tokens = {
257 { Opt_local_lock_all, "all" },
258 { Opt_local_lock_flock, "flock" },
259 { Opt_local_lock_posix, "posix" },
260 { Opt_local_lock_none, "none" },
261
262 { Opt_local_lock_err, NULL }
263};
264
bf0fd768 265
42faad99 266static void nfs_umount_begin(struct super_block *);
816724e6 267static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 268static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 269static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 270static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 271static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 272static struct dentry *nfs_fs_mount(struct file_system_type *,
273 int, const char *, void *);
31f43471
AV		 274static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
275 int flags, const char *dev_name, void *raw_data);
387c149b 276static void nfs_put_super(struct super_block *);
f7b422b1 277static void nfs_kill_super(struct super_block *);
48b605f8 278static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 279
280static struct file_system_type nfs_fs_type = {
281 .owner = THIS_MODULE,
282 .name = "nfs",
01194981 283 .mount = nfs_fs_mount,
f7b422b1 284 .kill_sb = nfs_kill_super,
349457cc 285 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 286};
287
54ceac45 288struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 289 .owner = THIS_MODULE,
290 .name = "nfs",
31f43471 291 .mount = nfs_xdev_mount,
f7b422b1 292 .kill_sb = nfs_kill_super,
349457cc 293 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 294};
295
ee9b6d61 296static const struct super_operations nfs_sops = {
f7b422b1
DH		 297 .alloc_inode = nfs_alloc_inode,
298 .destroy_inode = nfs_destroy_inode,
299 .write_inode = nfs_write_inode,
387c149b 300 .put_super = nfs_put_super,
f7b422b1 301 .statfs = nfs_statfs,
b57922d9 302 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 303 .umount_begin = nfs_umount_begin,
304 .show_options = nfs_show_options,
c7f404b4
AV		 305 .show_devname = nfs_show_devname,
306 .show_path = nfs_show_path,
f7b422b1 307 .show_stats = nfs_show_stats,
48b605f8 308 .remount_fs = nfs_remount,
f7b422b1
DH		 309};
310
311#ifdef CONFIG_NFS_V4
7630c852
CL		 312static int nfs4_validate_text_mount_data(void *options,
313 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 314static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
315 struct nfs_parsed_mount_data *data);
316static struct dentry *nfs4_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 318static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
320static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
01194981
AV		 322static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 324static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
325 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 326static void nfs4_kill_super(struct super_block *sb);
327
328static struct file_system_type nfs4_fs_type = {
329 .owner = THIS_MODULE,
330 .name = "nfs4",
01194981 331 .mount = nfs4_mount,
f7b422b1 332 .kill_sb = nfs4_kill_super,
349457cc 333 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 334};
335
c02d7adf
TM		 336static struct file_system_type nfs4_remote_fs_type = {
337 .owner = THIS_MODULE,
338 .name = "nfs4",
31f43471 339 .mount = nfs4_remote_mount,
c02d7adf
TM		 340 .kill_sb = nfs4_kill_super,
341 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
342};
343
54ceac45 344struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 345 .owner = THIS_MODULE,
346 .name = "nfs4",
31f43471 347 .mount = nfs4_xdev_mount,
f7b422b1 348 .kill_sb = nfs4_kill_super,
349457cc 349 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 350};
351
c02d7adf
TM		 352static struct file_system_type nfs4_remote_referral_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
31f43471 355 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 356 .kill_sb = nfs4_kill_super,
357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
358};
359
54ceac45 360struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 361 .owner = THIS_MODULE,
362 .name = "nfs4",
01194981 363 .mount = nfs4_referral_mount,
f7b422b1 364 .kill_sb = nfs4_kill_super,
349457cc 365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 366};
367
ee9b6d61 368static const struct super_operations nfs4_sops = {
f7b422b1
DH		 369 .alloc_inode = nfs_alloc_inode,
370 .destroy_inode = nfs_destroy_inode,
371 .write_inode = nfs_write_inode,
387c149b 372 .put_super = nfs_put_super,
f7b422b1 373 .statfs = nfs_statfs,
b57922d9 374 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 375 .umount_begin = nfs_umount_begin,
376 .show_options = nfs_show_options,
c7f404b4
AV		 377 .show_devname = nfs_show_devname,
378 .show_path = nfs_show_path,
f7b422b1 379 .show_stats = nfs_show_stats,
48b605f8 380 .remount_fs = nfs_remount,
f7b422b1
DH		 381};
382#endif
383
8e1f936b
RR		 384static struct shrinker acl_shrinker = {
385 .shrink = nfs_access_cache_shrinker,
386 .seeks = DEFAULT_SEEKS,
387};
979df72e 388
f7b422b1
DH		 389/*
390 * Register the NFS filesystems
391 */
392int __init register_nfs_fs(void)
393{
394 int ret;
395
396 ret = register_filesystem(&nfs_fs_type);
397 if (ret < 0)
398 goto error_0;
399
f7b422b1
DH		 400 ret = nfs_register_sysctl();
401 if (ret < 0)
402 goto error_1;
89a09141 403#ifdef CONFIG_NFS_V4
f7b422b1
DH		 404 ret = register_filesystem(&nfs4_fs_type);
405 if (ret < 0)
406 goto error_2;
407#endif
8e1f936b 408 register_shrinker(&acl_shrinker);
f7b422b1
DH		 409 return 0;
410
411#ifdef CONFIG_NFS_V4
412error_2:
413 nfs_unregister_sysctl();
89a09141 414#endif
f7b422b1
DH		 415error_1:
416 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 417error_0:
418 return ret;
419}
420
421/*
422 * Unregister the NFS filesystems
423 */
424void __exit unregister_nfs_fs(void)
425{
8e1f936b 426 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 427#ifdef CONFIG_NFS_V4
428 unregister_filesystem(&nfs4_fs_type);
f7b422b1 429#endif
49af7ee1 430 nfs_unregister_sysctl();
f7b422b1
DH		 431 unregister_filesystem(&nfs_fs_type);
432}
433
1daef0a8 434void nfs_sb_active(struct super_block *sb)
ef818a28 435{
1daef0a8 436 struct nfs_server *server = NFS_SB(sb);
ef818a28 437
1daef0a8
TM		 438 if (atomic_inc_return(&server->active) == 1)
439 atomic_inc(&sb->s_active);
ef818a28
SD		 440}
441
1daef0a8 442void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 443{
444 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 445
446 if (atomic_dec_and_test(&server->active))
447 deactivate_super(sb);
ef818a28
SD		 448}
449
f7b422b1
DH		 450/*
451 * Deliver file system statistics to userspace
452 */
816724e6 453static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 454{
0c7d90cf 455 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 456 unsigned char blockbits;
457 unsigned long blockres;
0c7d90cf 458 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 459 struct nfs_fsstat res;
460 int error = -ENOMEM;
461
462 res.fattr = nfs_alloc_fattr();
463 if (res.fattr == NULL)
464 goto out_err;
f7b422b1 465
8fa5c000 466 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 467 if (unlikely(error == -ESTALE)) {
468 struct dentry *pd_dentry;
469
470 pd_dentry = dget_parent(dentry);
471 if (pd_dentry != NULL) {
472 nfs_zap_caches(pd_dentry->d_inode);
473 dput(pd_dentry);
474 }
475 }
ca7e9a0d 476 nfs_free_fattr(res.fattr);
f7b422b1
DH		 477 if (error < 0)
478 goto out_err;
ca7e9a0d 479
1a0ba9ae 480 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 481
482 /*
483 * Current versions of glibc do not correctly handle the
484 * case where f_frsize != f_bsize. Eventually we want to
485 * report the value of wtmult in this field.
486 */
0c7d90cf 487 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 488
489 /*
490 * On most *nix systems, f_blocks, f_bfree, and f_bavail
491 * are reported in units of f_frsize. Linux hasn't had
492 * an f_frsize field in its statfs struct until recently,
493 * thus historically Linux's sys_statfs reports these
494 * fields in units of f_bsize.
495 */
0c7d90cf
DH		 496 buf->f_bsize = dentry->d_sb->s_blocksize;
497 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 498 blockres = (1 << blockbits) - 1;
499 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
500 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
501 buf->f_bavail = (res.abytes + blockres) >> blockbits;
502
503 buf->f_files = res.tfiles;
504 buf->f_ffree = res.afiles;
505
506 buf->f_namelen = server->namelen;
1a0ba9ae 507
f7b422b1
DH		 508 return 0;
509
510 out_err:
3110ff80 511 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 512 return error;
f7b422b1
DH		 513}
514
7d4e2747
DH		 515/*
516 * Map the security flavour number to a name
517 */
81039f1f
TM		 518static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
519{
7d4e2747 520 static const struct {
81039f1f
TM		 521 rpc_authflavor_t flavour;
522 const char *str;
523 } sec_flavours[] = {
524 { RPC_AUTH_NULL, "null" },
525 { RPC_AUTH_UNIX, "sys" },
526 { RPC_AUTH_GSS_KRB5, "krb5" },
527 { RPC_AUTH_GSS_KRB5I, "krb5i" },
528 { RPC_AUTH_GSS_KRB5P, "krb5p" },
529 { RPC_AUTH_GSS_LKEY, "lkey" },
530 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
531 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
532 { RPC_AUTH_GSS_SPKM, "spkm" },
533 { RPC_AUTH_GSS_SPKMI, "spkmi" },
534 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 535 { UINT_MAX, "unknown" }
81039f1f
TM		 536 };
537 int i;
538
4d81cd16 539 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 540 if (sec_flavours[i].flavour == flavour)
541 break;
542 }
543 return sec_flavours[i].str;
544}
545
ee671b01
JL		 546static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
547 int showdefaults)
548{
549 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
550
551 seq_printf(m, ",mountproto=");
552 switch (sap->sa_family) {
553 case AF_INET:
554 switch (nfss->mountd_protocol) {
555 case IPPROTO_UDP:
556 seq_printf(m, RPCBIND_NETID_UDP);
557 break;
558 case IPPROTO_TCP:
559 seq_printf(m, RPCBIND_NETID_TCP);
560 break;
561 default:
562 if (showdefaults)
563 seq_printf(m, "auto");
564 }
565 break;
566 case AF_INET6:
567 switch (nfss->mountd_protocol) {
568 case IPPROTO_UDP:
569 seq_printf(m, RPCBIND_NETID_UDP6);
570 break;
571 case IPPROTO_TCP:
572 seq_printf(m, RPCBIND_NETID_TCP6);
573 break;
574 default:
575 if (showdefaults)
576 seq_printf(m, "auto");
577 }
578 break;
579 default:
580 if (showdefaults)
581 seq_printf(m, "auto");
582 }
583}
584
82d101d5
CL		 585static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
586 int showdefaults)
587{
588 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
589
d5eff1a3
BS		 590 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
591 return;
592
82d101d5
CL		 593 switch (sap->sa_family) {
594 case AF_INET: {
595 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 596 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 597 break;
598 }
599 case AF_INET6: {
600 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 601 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 602 break;
603 }
604 default:
605 if (showdefaults)
606 seq_printf(m, ",mountaddr=unspecified");
607 }
608
609 if (nfss->mountd_version || showdefaults)
610 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 611 if ((nfss->mountd_port &&
612 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
613 showdefaults)
82d101d5
CL		 614 seq_printf(m, ",mountport=%u", nfss->mountd_port);
615
ee671b01 616 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 617}
618
0be8189f
TM		 619#ifdef CONFIG_NFS_V4
620static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
621 int showdefaults)
622{
623 struct nfs_client *clp = nfss->nfs_client;
624
625 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
626 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
627}
628#else
629static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
630 int showdefaults)
631{
632}
633#endif
634
f7b422b1
DH		 635/*
636 * Describe the mount options in force on this server representation
637 */
82d101d5
CL		 638static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
639 int showdefaults)
f7b422b1 640{
509de811 641 static const struct proc_nfs_info {
f7b422b1 642 int flag;
509de811
DH		 643 const char *str;
644 const char *nostr;
f7b422b1
DH		 645 } nfs_info[] = {
646 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 647 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 648 { NFS_MOUNT_NOCTO, ",nocto", "" },
649 { NFS_MOUNT_NOAC, ",noac", "" },
650 { NFS_MOUNT_NONLM, ",nolock", "" },
651 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 652 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 653 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
654 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 655 { 0, NULL, NULL }
656 };
509de811 657 const struct proc_nfs_info *nfs_infop;
8fa5c000 658 struct nfs_client *clp = nfss->nfs_client;
82d101d5 659 u32 version = clp->rpc_ops->version;
7c563cc9 660 int local_flock, local_fcntl;
f7b422b1 661
82d101d5 662 seq_printf(m, ",vers=%u", version);
2d767432
CL		 663 seq_printf(m, ",rsize=%u", nfss->rsize);
664 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 665 if (nfss->bsize != 0)
666 seq_printf(m, ",bsize=%u", nfss->bsize);
667 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 668 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 669 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 670 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 671 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 672 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 673 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 674 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 675 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 676 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
677 if (nfss->flags & nfs_infop->flag)
678 seq_puts(m, nfs_infop->str);
679 else
680 seq_puts(m, nfs_infop->nostr);
681 }
56928edd 682 seq_printf(m, ",proto=%s",
ee671b01 683 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 684 if (version == 4) {
685 if (nfss->port != NFS_PORT)
686 seq_printf(m, ",port=%u", nfss->port);
687 } else
688 if (nfss->port)
689 seq_printf(m, ",port=%u", nfss->port);
690
33170233
TM		 691 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
692 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 693 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 694
695 if (version != 4)
696 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 697 else
698 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 699
b797cac7
DH		 700 if (nfss->options & NFS_OPTION_FSCACHE)
701 seq_printf(m, ",fsc");
9b00c643
PL		 702
703 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
704 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
705 seq_printf(m, ",lookupcache=none");
706 else
707 seq_printf(m, ",lookupcache=pos");
708 }
7c563cc9
SJ		 709
710 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
711 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
712
713 if (!local_flock && !local_fcntl)
714 seq_printf(m, ",local_lock=none");
715 else if (local_flock && local_fcntl)
716 seq_printf(m, ",local_lock=all");
717 else if (local_flock)
718 seq_printf(m, ",local_lock=flock");
719 else
720 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 721}
722
723/*
724 * Describe the mount options on this VFS mountpoint
725 */
34c80b1d 726static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 727{
34c80b1d 728 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 729
730 nfs_show_mount_options(m, nfss, 0);
731
5d8515ca
CL		 732 seq_printf(m, ",addr=%s",
733 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
734 RPC_DISPLAY_ADDR));
f7b422b1
DH		 735
736 return 0;
737}
45402c38
HS		 738
739#ifdef CONFIG_NFS_V4
ae50c0b5 740#ifdef CONFIG_NFS_V4_1
45402c38 741static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 742{
743 if (nfs4_has_session(server->nfs_client))
744 seq_printf(m, ",sessions");
745}
746#else
45402c38
HS		 747static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
748#endif
ae50c0b5
BF		 749#endif
750
45402c38 751#ifdef CONFIG_NFS_V4
ae50c0b5 752#ifdef CONFIG_NFS_V4_1
45402c38 753static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 754{
755 seq_printf(m, ",pnfs=");
756 if (server->pnfs_curr_ld)
757 seq_printf(m, "%s", server->pnfs_curr_ld->name);
758 else
759 seq_printf(m, "not configured");
760}
45402c38
HS		 761#else
762static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
763#endif
764#endif
f7b422b1 765
d861c630 766static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 767{
768 char *page = (char *) __get_free_page(GFP_KERNEL);
769 char *devname, *dummy;
770 int err = 0;
771 if (!page)
772 return -ENOMEM;
d861c630 773 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 774 if (IS_ERR(devname))
775 err = PTR_ERR(devname);
776 else
777 seq_escape(m, devname, " \t\n\\");
778 free_page((unsigned long)page);
779 return err;
780}
781
a6322de6 782static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 783{
784 seq_puts(m, "/");
785 return 0;
786}
787
f7b422b1
DH		 788/*
789 * Present statistical information for this VFS mountpoint
790 */
64132379 791static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 792{
793 int i, cpu;
64132379 794 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 795 struct rpc_auth *auth = nfss->client->cl_auth;
796 struct nfs_iostats totals = { };
797
798 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
799
800 /*
801 * Display all mount option settings
802 */
803 seq_printf(m, "\n\topts:\t");
64132379
AV		 804 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
805 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
806 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
807 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 808 nfs_show_mount_options(m, nfss, 1);
809
810 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
811
812 seq_printf(m, "\n\tcaps:\t");
813 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 814 seq_printf(m, ",wtmult=%u", nfss->wtmult);
815 seq_printf(m, ",dtsize=%u", nfss->dtsize);
816 seq_printf(m, ",bsize=%u", nfss->bsize);
817 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 818
819#ifdef CONFIG_NFS_V4
40c55319 820 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 821 seq_printf(m, "\n\tnfsv4:\t");
822 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
823 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
824 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 825 show_sessions(m, nfss);
826 show_pnfs(m, nfss);
f7b422b1
DH		 827 }
828#endif
829
830 /*
831 * Display security flavor in effect for this mount
832 */
2d767432 833 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 834 if (auth->au_flavor)
2d767432 835 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 836
837 /*
838 * Display superblock I/O counters
839 */
840 for_each_possible_cpu(cpu) {
841 struct nfs_iostats *stats;
842
843 preempt_disable();
844 stats = per_cpu_ptr(nfss->io_stats, cpu);
845
846 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
847 totals.events[i] += stats->events[i];
848 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
849 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 850#ifdef CONFIG_NFS_FSCACHE
851 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
852 totals.fscache[i] += stats->fscache[i];
853#endif
f7b422b1
DH		 854
855 preempt_enable();
856 }
857
858 seq_printf(m, "\n\tevents:\t");
859 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
860 seq_printf(m, "%lu ", totals.events[i]);
861 seq_printf(m, "\n\tbytes:\t");
862 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
863 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 864#ifdef CONFIG_NFS_FSCACHE
865 if (nfss->options & NFS_OPTION_FSCACHE) {
866 seq_printf(m, "\n\tfsc:\t");
867 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
868 seq_printf(m, "%Lu ", totals.bytes[i]);
869 }
870#endif
f7b422b1
DH		 871 seq_printf(m, "\n");
872
873 rpc_print_iostats(m, nfss->client);
874
875 return 0;
876}
877
878/*
879 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 880 * in response to xdev traversals and referrals
f7b422b1 881 */
42faad99 882static void nfs_umount_begin(struct super_block *sb)
f7b422b1 883{
67e55205 884 struct nfs_server *server;
fc6ae3cf
TM		 885 struct rpc_clnt *rpc;
886
67e55205 887 server = NFS_SB(sb);
fc6ae3cf
TM		 888 /* -EIO all pending I/O */
889 rpc = server->client_acl;
890 if (!IS_ERR(rpc))
891 rpc_killall_tasks(rpc);
892 rpc = server->client;
893 if (!IS_ERR(rpc))
894 rpc_killall_tasks(rpc);
f7b422b1
DH		 895}
896
c5811dbd 897static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 898{
899 struct nfs_parsed_mount_data *data;
900
901 data = kzalloc(sizeof(*data), GFP_KERNEL);
902 if (data) {
9423a08a
CL		 903 data->acregmin = NFS_DEF_ACREGMIN;
904 data->acregmax = NFS_DEF_ACREGMAX;
905 data->acdirmin = NFS_DEF_ACDIRMIN;
906 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 907 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 908 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 909 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 910 data->auth_flavors[0] = RPC_AUTH_UNIX;
911 data->auth_flavor_len = 1;
c5811dbd 912 data->version = version;
9423a08a 913 data->minorversion = 0;
8a0d551a 914 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 915 }
916 return data;
917}
918
8a0d551a
JL		 919static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
920{
921 if (data) {
922 kfree(data->client_address);
923 kfree(data->mount_server.hostname);
924 kfree(data->nfs_server.export_path);
925 kfree(data->nfs_server.hostname);
926 kfree(data->fscache_uniq);
927 security_free_mnt_opts(&data->lsm_opts);
928 kfree(data);
929 }
930}
931
fc50d58f 932/*
cdcd7f9a
CL		 933 * Sanity-check a server address provided by the mount command.
934 *
935 * Address family must be initialized, and address must not be
936 * the ANY address for that family.
fc50d58f
CL		 937 */
938static int nfs_verify_server_address(struct sockaddr *addr)
939{
940 switch (addr->sa_family) {
941 case AF_INET: {
cdcd7f9a 942 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 943 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 944 }
945 case AF_INET6: {
946 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
947 return !ipv6_addr_any(sa);
fc50d58f
CL		 948 }
949 }
950
53a0b9c4 951 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 952 return 0;
953}
954
4cfd74fc
CL		 955/*
956 * Select between a default port value and a user-specified port value.
957 * If a zero value is set, then autobind will be used.
958 */
f5855fec 959static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 960 const unsigned short default_port)
961{
f5855fec
TM		 962 if (*port == NFS_UNSPEC_PORT)
963 *port = default_port;
4cfd74fc 964
f5855fec 965 rpc_set_port(sap, *port);
4cfd74fc
CL		 966}
967
259875ef
TM		 968/*
969 * Sanity check the NFS transport protocol.
970 *
971 */
972static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
973{
974 switch (mnt->nfs_server.protocol) {
975 case XPRT_TRANSPORT_UDP:
976 case XPRT_TRANSPORT_TCP:
977 case XPRT_TRANSPORT_RDMA:
978 break;
979 default:
980 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
981 }
982}
983
984/*
985 * For text based NFSv2/v3 mounts, the mount protocol transport default
986 * settings should depend upon the specified NFS transport.
987 */
988static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
989{
990 nfs_validate_transport_protocol(mnt);
991
992 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
993 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
994 return;
995 switch (mnt->nfs_server.protocol) {
996 case XPRT_TRANSPORT_UDP:
997 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
998 break;
999 case XPRT_TRANSPORT_TCP:
1000 case XPRT_TRANSPORT_RDMA:
1001 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1002 }
1003}
1004
01060c89
CL		 1005/*
1006 * Parse the value of the 'sec=' option.
01060c89
CL		 1007 */
1008static int nfs_parse_security_flavors(char *value,
1009 struct nfs_parsed_mount_data *mnt)
1010{
1011 substring_t args[MAX_OPT_ARGS];
1012
1013 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1014
1015 switch (match_token(value, nfs_secflavor_tokens, args)) {
1016 case Opt_sec_none:
01060c89
CL		 1017 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1018 break;
1019 case Opt_sec_sys:
01060c89
CL		 1020 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1021 break;
1022 case Opt_sec_krb5:
01060c89
CL		 1023 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1024 break;
1025 case Opt_sec_krb5i:
01060c89
CL		 1026 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1027 break;
1028 case Opt_sec_krb5p:
01060c89
CL		 1029 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1030 break;
1031 case Opt_sec_lkey:
01060c89
CL		 1032 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1033 break;
1034 case Opt_sec_lkeyi:
01060c89
CL		 1035 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1036 break;
1037 case Opt_sec_lkeyp:
01060c89
CL		 1038 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1039 break;
1040 case Opt_sec_spkm:
01060c89
CL		 1041 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1042 break;
1043 case Opt_sec_spkmi:
01060c89
CL		 1044 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1045 break;
1046 case Opt_sec_spkmp:
01060c89
CL		 1047 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1048 break;
1049 default:
1050 return 0;
1051 }
1052
9b7160c5 1053 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1054 mnt->auth_flavor_len = 1;
01060c89
CL		 1055 return 1;
1056}
1057
c5cb09b6
RL		 1058static int nfs_get_option_str(substring_t args[], char **option)
1059{
1060 kfree(*option);
1061 *option = match_strdup(args);
1062 return !option;
1063}
1064
1065static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1066{
1067 int rc;
1068 char *string;
1069
1070 string = match_strdup(args);
1071 if (string == NULL)
1072 return -ENOMEM;
1073 rc = strict_strtoul(string, 10, option);
1074 kfree(string);
1075
1076 return rc;
1077}
1078
bf0fd768
CL		 1079/*
1080 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1081 * a data structure. The whole mount string is processed; bad options are
1082 * skipped as they are encountered. If there were no errors, return 1;
1083 * otherwise return 0 (zero).
bf0fd768
CL		 1084 */
1085static int nfs_parse_mount_options(char *raw,
1086 struct nfs_parsed_mount_data *mnt)
1087{
f9c3a380 1088 char *p, *string, *secdata;
d23c45fd 1089 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1090 unsigned short protofamily = AF_UNSPEC;
1091 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1092
1093 if (!raw) {
1094 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1095 return 1;
1096 }
1097 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1098
f9c3a380
EP		 1099 secdata = alloc_secdata();
1100 if (!secdata)
1101 goto out_nomem;
1102
1103 rc = security_sb_copy_data(raw, secdata);
1104 if (rc)
1105 goto out_security_failure;
1106
1107 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1108 if (rc)
1109 goto out_security_failure;
1110
1111 free_secdata(secdata);
1112
e50a7a1a
SK		 1113 mnt->net = current->nsproxy->net_ns;
1114
bf0fd768
CL		 1115 while ((p = strsep(&raw, ",")) != NULL) {
1116 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1117 unsigned long option;
1118 int token;
bf0fd768
CL		 1119
1120 if (!*p)
1121 continue;
1122
1123 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1124
1125 token = match_token(p, nfs_mount_option_tokens, args);
1126 switch (token) {
f45663ce
CL		 1127
1128 /*
1129 * boolean options: foo/nofoo
1130 */
bf0fd768
CL		 1131 case Opt_soft:
1132 mnt->flags |= NFS_MOUNT_SOFT;
1133 break;
1134 case Opt_hard:
1135 mnt->flags &= ~NFS_MOUNT_SOFT;
1136 break;
bf0fd768
CL		 1137 case Opt_posix:
1138 mnt->flags |= NFS_MOUNT_POSIX;
1139 break;
1140 case Opt_noposix:
1141 mnt->flags &= ~NFS_MOUNT_POSIX;
1142 break;
1143 case Opt_cto:
1144 mnt->flags &= ~NFS_MOUNT_NOCTO;
1145 break;
1146 case Opt_nocto:
1147 mnt->flags |= NFS_MOUNT_NOCTO;
1148 break;
1149 case Opt_ac:
1150 mnt->flags &= ~NFS_MOUNT_NOAC;
1151 break;
1152 case Opt_noac:
1153 mnt->flags |= NFS_MOUNT_NOAC;
1154 break;
1155 case Opt_lock:
1156 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1157 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1158 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1159 break;
1160 case Opt_nolock:
1161 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1162 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1163 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1164 break;
1165 case Opt_v2:
1166 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1167 mnt->version = 2;
bf0fd768
CL		 1168 break;
1169 case Opt_v3:
1170 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1171 mnt->version = 3;
bf0fd768 1172 break;
764302cc
CL		 1173 case Opt_v4:
1174 mnt->flags &= ~NFS_MOUNT_VER3;
1175 mnt->version = 4;
1176 break;
7ced286e
WAA		 1177 case Opt_v4_0:
1178 mnt->flags &= ~NFS_MOUNT_VER3;
1179 mnt->version = 4;
1180 mnt->minorversion = 0;
1181 break;
1182 case Opt_v4_1:
1183 mnt->flags &= ~NFS_MOUNT_VER3;
1184 mnt->version = 4;
1185 mnt->minorversion = 1;
1186 break;
bf0fd768
CL		 1187 case Opt_udp:
1188 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1189 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1190 break;
1191 case Opt_tcp:
1192 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1193 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1194 break;
2cf7ff7a
TT		 1195 case Opt_rdma:
1196 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1197 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1198 xprt_load_transport(p);
2cf7ff7a 1199 break;
bf0fd768
CL		 1200 case Opt_acl:
1201 mnt->flags &= ~NFS_MOUNT_NOACL;
1202 break;
1203 case Opt_noacl:
1204 mnt->flags |= NFS_MOUNT_NOACL;
1205 break;
1206 case Opt_rdirplus:
1207 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1208 break;
1209 case Opt_nordirplus:
1210 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1211 break;
75180df2
TM		 1212 case Opt_sharecache:
1213 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1214 break;
1215 case Opt_nosharecache:
1216 mnt->flags |= NFS_MOUNT_UNSHARED;
1217 break;
d740351b
CL		 1218 case Opt_resvport:
1219 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1220 break;
1221 case Opt_noresvport:
1222 mnt->flags |= NFS_MOUNT_NORESVPORT;
1223 break;
b797cac7
DH		 1224 case Opt_fscache:
1225 mnt->options |= NFS_OPTION_FSCACHE;
1226 kfree(mnt->fscache_uniq);
1227 mnt->fscache_uniq = NULL;
1228 break;
1229 case Opt_nofscache:
1230 mnt->options &= ~NFS_OPTION_FSCACHE;
1231 kfree(mnt->fscache_uniq);
1232 mnt->fscache_uniq = NULL;
1233 break;
bf0fd768 1234
f45663ce
CL		 1235 /*
1236 * options that take numeric values
1237 */
bf0fd768 1238 case Opt_port:
c5cb09b6
RL		 1239 if (nfs_get_option_ul(args, &option) ||
1240 option > USHRT_MAX)
d23c45fd
CL		 1241 goto out_invalid_value;
1242 mnt->nfs_server.port = option;
bf0fd768
CL		 1243 break;
1244 case Opt_rsize:
c5cb09b6 1245 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1246 goto out_invalid_value;
1247 mnt->rsize = option;
bf0fd768
CL		 1248 break;
1249 case Opt_wsize:
c5cb09b6 1250 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1251 goto out_invalid_value;
1252 mnt->wsize = option;
bf0fd768
CL		 1253 break;
1254 case Opt_bsize:
c5cb09b6 1255 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1256 goto out_invalid_value;
1257 mnt->bsize = option;
bf0fd768
CL		 1258 break;
1259 case Opt_timeo:
c5cb09b6 1260 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1261 goto out_invalid_value;
1262 mnt->timeo = option;
bf0fd768
CL		 1263 break;
1264 case Opt_retrans:
c5cb09b6 1265 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1266 goto out_invalid_value;
1267 mnt->retrans = option;
bf0fd768
CL		 1268 break;
1269 case Opt_acregmin:
c5cb09b6 1270 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1271 goto out_invalid_value;
1272 mnt->acregmin = option;
bf0fd768
CL		 1273 break;
1274 case Opt_acregmax:
c5cb09b6 1275 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1276 goto out_invalid_value;
1277 mnt->acregmax = option;
bf0fd768
CL		 1278 break;
1279 case Opt_acdirmin:
c5cb09b6 1280 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1281 goto out_invalid_value;
1282 mnt->acdirmin = option;
bf0fd768
CL		 1283 break;
1284 case Opt_acdirmax:
c5cb09b6 1285 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1286 goto out_invalid_value;
1287 mnt->acdirmax = option;
bf0fd768
CL		 1288 break;
1289 case Opt_actimeo:
c5cb09b6 1290 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1291 goto out_invalid_value;
1292 mnt->acregmin = mnt->acregmax =
1293 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1294 break;
1295 case Opt_namelen:
c5cb09b6 1296 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1297 goto out_invalid_value;
1298 mnt->namlen = option;
bf0fd768
CL		 1299 break;
1300 case Opt_mountport:
c5cb09b6
RL		 1301 if (nfs_get_option_ul(args, &option) ||
1302 option > USHRT_MAX)
d23c45fd
CL		 1303 goto out_invalid_value;
1304 mnt->mount_server.port = option;
bf0fd768 1305 break;
bf0fd768 1306 case Opt_mountvers:
c5cb09b6 1307 if (nfs_get_option_ul(args, &option) ||
f45663ce 1308 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1309 option > NFS_MNT3_VERSION)
1310 goto out_invalid_value;
1311 mnt->mount_server.version = option;
bf0fd768 1312 break;
bf0fd768 1313 case Opt_nfsvers:
c5cb09b6 1314 if (nfs_get_option_ul(args, &option))
d23c45fd 1315 goto out_invalid_value;
bf0fd768 1316 switch (option) {
f45663ce 1317 case NFS2_VERSION:
bf0fd768 1318 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1319 mnt->version = 2;
bf0fd768 1320 break;
f45663ce 1321 case NFS3_VERSION:
bf0fd768 1322 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1323 mnt->version = 3;
1324 break;
764302cc
CL		 1325 case NFS4_VERSION:
1326 mnt->flags &= ~NFS_MOUNT_VER3;
1327 mnt->version = 4;
bf0fd768
CL		 1328 break;
1329 default:
d23c45fd 1330 goto out_invalid_value;
bf0fd768
CL		 1331 }
1332 break;
3fd5be9e 1333 case Opt_minorversion:
c5cb09b6 1334 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1335 goto out_invalid_value;
1336 if (option > NFS4_MAX_MINOR_VERSION)
1337 goto out_invalid_value;
1338 mnt->minorversion = option;
3fd5be9e 1339 break;
bf0fd768 1340
f45663ce
CL		 1341 /*
1342 * options that take text values
1343 */
bf0fd768
CL		 1344 case Opt_sec:
1345 string = match_strdup(args);
1346 if (string == NULL)
1347 goto out_nomem;
01060c89 1348 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1349 kfree(string);
f45663ce 1350 if (!rc) {
f45663ce
CL		 1351 dfprintk(MOUNT, "NFS: unrecognized "
1352 "security flavor\n");
d23c45fd 1353 return 0;
f45663ce 1354 }
bf0fd768
CL		 1355 break;
1356 case Opt_proto:
1357 string = match_strdup(args);
1358 if (string == NULL)
1359 goto out_nomem;
1360 token = match_token(string,
1361 nfs_xprt_protocol_tokens, args);
bf0fd768 1362
ee671b01 1363 protofamily = AF_INET;
bf0fd768 1364 switch (token) {
ee671b01
JL		 1365 case Opt_xprt_udp6:
1366 protofamily = AF_INET6;
fdb66ff4 1367 case Opt_xprt_udp:
bf0fd768 1368 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1369 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1370 break;
ee671b01
JL		 1371 case Opt_xprt_tcp6:
1372 protofamily = AF_INET6;
fdb66ff4 1373 case Opt_xprt_tcp:
bf0fd768 1374 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1375 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1376 break;
2cf7ff7a
TT		 1377 case Opt_xprt_rdma:
1378 /* vector side protocols to TCP */
1379 mnt->flags |= NFS_MOUNT_TCP;
1380 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1381 xprt_load_transport(string);
2cf7ff7a 1382 break;
bf0fd768 1383 default:
f45663ce
CL		 1384 dfprintk(MOUNT, "NFS: unrecognized "
1385 "transport protocol\n");
4223a4a1 1386 kfree(string);
d23c45fd 1387 return 0;
bf0fd768 1388 }
c5cb09b6 1389 kfree(string);
bf0fd768
CL		 1390 break;
1391 case Opt_mountproto:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
1395 token = match_token(string,
1396 nfs_xprt_protocol_tokens, args);
d508afb4 1397 kfree(string);
bf0fd768 1398
ee671b01 1399 mountfamily = AF_INET;
bf0fd768 1400 switch (token) {
ee671b01
JL		 1401 case Opt_xprt_udp6:
1402 mountfamily = AF_INET6;
fdb66ff4 1403 case Opt_xprt_udp:
0896a725 1404 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1405 break;
ee671b01
JL		 1406 case Opt_xprt_tcp6:
1407 mountfamily = AF_INET6;
fdb66ff4 1408 case Opt_xprt_tcp:
0896a725 1409 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1410 break;
2cf7ff7a 1411 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1412 default:
f45663ce
CL		 1413 dfprintk(MOUNT, "NFS: unrecognized "
1414 "transport protocol\n");
d23c45fd 1415 return 0;
bf0fd768
CL		 1416 }
1417 break;
1418 case Opt_addr:
1419 string = match_strdup(args);
1420 if (string == NULL)
1421 goto out_nomem;
53a0b9c4 1422 mnt->nfs_server.addrlen =
b48e1278 1423 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1424 (struct sockaddr *)
1425 &mnt->nfs_server.address,
1426 sizeof(mnt->nfs_server.address));
bf0fd768 1427 kfree(string);
53a0b9c4
CL		 1428 if (mnt->nfs_server.addrlen == 0)
1429 goto out_invalid_address;
bf0fd768
CL		 1430 break;
1431 case Opt_clientaddr:
c5cb09b6 1432 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1433 goto out_nomem;
bf0fd768 1434 break;
33832034 1435 case Opt_mounthost:
c5cb09b6
RL		 1436 if (nfs_get_option_str(args,
1437 &mnt->mount_server.hostname))
33832034 1438 goto out_nomem;
33832034 1439 break;
0ac83779 1440 case Opt_mountaddr:
bf0fd768
CL		 1441 string = match_strdup(args);
1442 if (string == NULL)
1443 goto out_nomem;
53a0b9c4 1444 mnt->mount_server.addrlen =
b48e1278 1445 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1446 (struct sockaddr *)
1447 &mnt->mount_server.address,
1448 sizeof(mnt->mount_server.address));
bf0fd768 1449 kfree(string);
53a0b9c4
CL		 1450 if (mnt->mount_server.addrlen == 0)
1451 goto out_invalid_address;
bf0fd768 1452 break;
7973c1f1
TM		 1453 case Opt_lookupcache:
1454 string = match_strdup(args);
1455 if (string == NULL)
1456 goto out_nomem;
1457 token = match_token(string,
1458 nfs_lookupcache_tokens, args);
1459 kfree(string);
1460 switch (token) {
1461 case Opt_lookupcache_all:
1462 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1463 break;
1464 case Opt_lookupcache_positive:
1465 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1466 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1467 break;
1468 case Opt_lookupcache_none:
1469 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1470 break;
1471 default:
7973c1f1
TM		 1472 dfprintk(MOUNT, "NFS: invalid "
1473 "lookupcache argument\n");
d23c45fd 1474 return 0;
7973c1f1
TM		 1475 };
1476 break;
a6d5ff64 1477 case Opt_fscache_uniq:
c5cb09b6 1478 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1479 goto out_nomem;
a6d5ff64
CL		 1480 mnt->options |= NFS_OPTION_FSCACHE;
1481 break;
5eebde23
SJ		 1482 case Opt_local_lock:
1483 string = match_strdup(args);
1484 if (string == NULL)
1485 goto out_nomem;
1486 token = match_token(string, nfs_local_lock_tokens,
1487 args);
1488 kfree(string);
1489 switch (token) {
1490 case Opt_local_lock_all:
1491 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1492 NFS_MOUNT_LOCAL_FCNTL);
1493 break;
1494 case Opt_local_lock_flock:
1495 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1496 break;
1497 case Opt_local_lock_posix:
1498 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1499 break;
1500 case Opt_local_lock_none:
1501 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1502 NFS_MOUNT_LOCAL_FCNTL);
1503 break;
1504 default:
1505 dfprintk(MOUNT, "NFS: invalid "
1506 "local_lock argument\n");
1507 return 0;
1508 };
1509 break;
bf0fd768 1510
f45663ce
CL		 1511 /*
1512 * Special options
1513 */
1514 case Opt_sloppy:
1515 sloppy = 1;
1516 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1517 break;
bf0fd768
CL		 1518 case Opt_userspace:
1519 case Opt_deprecated:
d33e4dfe
CL		 1520 dfprintk(MOUNT, "NFS: ignoring mount option "
1521 "'%s'\n", p);
bf0fd768
CL		 1522 break;
1523
1524 default:
d23c45fd 1525 invalid_option = 1;
f45663ce
CL		 1526 dfprintk(MOUNT, "NFS: unrecognized mount option "
1527 "'%s'\n", p);
bf0fd768
CL		 1528 }
1529 }
1530
d23c45fd
CL		 1531 if (!sloppy && invalid_option)
1532 return 0;
1533
ee671b01
JL		 1534 /*
1535 * verify that any proto=/mountproto= options match the address
1536 * familiies in the addr=/mountaddr= options.
1537 */
1538 if (protofamily != AF_UNSPEC &&
1539 protofamily != mnt->nfs_server.address.ss_family)
1540 goto out_proto_mismatch;
1541
1542 if (mountfamily != AF_UNSPEC) {
1543 if (mnt->mount_server.addrlen) {
1544 if (mountfamily != mnt->mount_server.address.ss_family)
1545 goto out_mountproto_mismatch;
1546 } else {
1547 if (mountfamily != mnt->nfs_server.address.ss_family)
1548 goto out_mountproto_mismatch;
1549 }
1550 }
1551
bf0fd768
CL		 1552 return 1;
1553
ee671b01
JL		 1554out_mountproto_mismatch:
1555 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1556 "option\n");
1557 return 0;
1558out_proto_mismatch:
1559 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1560 return 0;
53a0b9c4
CL		 1561out_invalid_address:
1562 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1563 return 0;
d23c45fd 1564out_invalid_value:
53a0b9c4 1565 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1566 return 0;
bf0fd768
CL		 1567out_nomem:
1568 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1569 return 0;
f9c3a380
EP		 1570out_security_failure:
1571 free_secdata(secdata);
1572 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1573 return 0;
bf0fd768
CL		 1574}
1575
ec88f28d
CL		 1576/*
1577 * Match the requested auth flavors with the list returned by
1578 * the server. Returns zero and sets the mount's authentication
1579 * flavor on success; returns -EACCES if server does not support
1580 * the requested flavor.
1581 */
1582static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1583 struct nfs_mount_request *request)
1584{
1585 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1586
5eecfde6
CL		 1587 /*
1588 * Certain releases of Linux's mountd return an empty
1589 * flavor list. To prevent behavioral regression with
1590 * these servers (ie. rejecting mounts that used to
1591 * succeed), revert to pre-2.6.32 behavior (no checking)
1592 * if the returned flavor list is empty.
1593 */
1594 if (server_authlist_len == 0)
1595 return 0;
1596
ec88f28d
CL		 1597 /*
1598 * We avoid sophisticated negotiating here, as there are
1599 * plenty of cases where we can get it wrong, providing
1600 * either too little or too much security.
1601 *
1602 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1603 * flavor listed first. However, some servers list
1604 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1605 * preferred default, in args->auth_flavors[0] if user
1606 * didn't specify sec= mount option.
1607 */
1608 for (i = 0; i < args->auth_flavor_len; i++)
1609 for (j = 0; j < server_authlist_len; j++)
1610 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1611 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1612 request->auth_flavs[j]);
1613 args->auth_flavors[0] = request->auth_flavs[j];
1614 return 0;
1615 }
1616
1617 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1618 nfs_umount(request);
1619 return -EACCES;
1620}
1621
0076d7b7
CL		 1622/*
1623 * Use the remote server's MOUNT service to request the NFS file handle
1624 * corresponding to the provided path.
1625 */
1626static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1627 struct nfs_fh *root_fh)
1628{
ec88f28d
CL		 1629 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1630 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1631 struct nfs_mount_request request = {
1632 .sap = (struct sockaddr *)
1633 &args->mount_server.address,
1634 .dirpath = args->nfs_server.export_path,
1635 .protocol = args->mount_server.protocol,
1636 .fh = root_fh,
50a737f8 1637 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1638 .auth_flav_len = &server_authlist_len,
1639 .auth_flavs = server_authlist,
6d59b8d5 1640 .net = args->net,
c5d120f8 1641 };
4c568017 1642 int status;
0076d7b7
CL		 1643
1644 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1645 switch (args->version) {
1646 default:
1647 args->mount_server.version = NFS_MNT3_VERSION;
1648 break;
1649 case 2:
1650 args->mount_server.version = NFS_MNT_VERSION;
1651 }
0076d7b7 1652 }
c5d120f8 1653 request.version = args->mount_server.version;
0076d7b7 1654
33832034 1655 if (args->mount_server.hostname)
c5d120f8 1656 request.hostname = args->mount_server.hostname;
33832034 1657 else
c5d120f8 1658 request.hostname = args->nfs_server.hostname;
33832034 1659
0076d7b7
CL		 1660 /*
1661 * Construct the mount server's address.
1662 */
4c568017 1663 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1664 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1665 args->nfs_server.addrlen);
1666 args->mount_server.addrlen = args->nfs_server.addrlen;
1667 }
c5d120f8 1668 request.salen = args->mount_server.addrlen;
f5855fec 1669 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1670
1671 /*
1672 * Now ask the mount server to map our export path
1673 * to a file handle.
1674 */
c5d120f8 1675 status = nfs_mount(&request);
ec88f28d
CL		 1676 if (status != 0) {
1677 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1678 request.hostname, status);
1679 return status;
1680 }
0076d7b7 1681
ec88f28d
CL		 1682 /*
1683 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1684 */
1685 if (args->mount_server.version != NFS_MNT3_VERSION)
1686 return 0;
1687 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1688}
1689
c12bacec
RL		 1690/*
1691 * Split "dev_name" into "hostname:export_path".
1692 *
1693 * The leftmost colon demarks the split between the server's hostname
1694 * and the export path. If the hostname starts with a left square
1695 * bracket, then it may contain colons.
1696 *
1697 * Note: caller frees hostname and export path, even on error.
1698 */
1699static int nfs_parse_devname(const char *dev_name,
1700 char **hostname, size_t maxnamlen,
1701 char **export_path, size_t maxpathlen)
dc045898
CL		 1702{
1703 size_t len;
c12bacec 1704 char *end;
dc045898 1705
c12bacec
RL		 1706 /* Is the host name protected with square brakcets? */
1707 if (*dev_name == '[') {
1708 end = strchr(++dev_name, ']');
1709 if (end == NULL || end[1] != ':')
dc045898 1710 goto out_bad_devname;
dc045898 1711
c12bacec
RL		 1712 len = end - dev_name;
1713 end++;
1714 } else {
1715 char *comma;
dc045898 1716
c12bacec
RL		 1717 end = strchr(dev_name, ':');
1718 if (end == NULL)
1719 goto out_bad_devname;
1720 len = end - dev_name;
d1aa0825 1721
c12bacec
RL		 1722 /* kill possible hostname list: not supported */
1723 comma = strchr(dev_name, ',');
1724 if (comma != NULL && comma < end)
1725 *comma = 0;
1726 }
d1aa0825 1727
d1aa0825
CL		 1728 if (len > maxnamlen)
1729 goto out_hostname;
1730
1731 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1732 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1733 if (*hostname == NULL)
1734 goto out_nomem;
c12bacec 1735 len = strlen(++end);
d1aa0825
CL		 1736 if (len > maxpathlen)
1737 goto out_path;
1738 *export_path = kstrndup(end, len, GFP_KERNEL);
1739 if (!*export_path)
1740 goto out_nomem;
1741
c12bacec 1742 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1743 return 0;
1744
1745out_bad_devname:
1746 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1747 return -EINVAL;
1748
1749out_nomem:
1750 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1751 return -ENOMEM;
1752
1753out_hostname:
1754 dfprintk(MOUNT, "NFS: server hostname too long\n");
1755 return -ENAMETOOLONG;
1756
1757out_path:
1758 dfprintk(MOUNT, "NFS: export pathname too long\n");
1759 return -ENAMETOOLONG;
1760}
1761
f7b422b1 1762/*
54ceac45
DH		 1763 * Validate the NFS2/NFS3 mount data
1764 * - fills in the mount root filehandle
136d558c
CL		 1765 *
1766 * For option strings, user space handles the following behaviors:
1767 *
1768 * + DNS: mapping server host name to IP address ("addr=" option)
1769 *
1770 * + failure mode: how to behave if a mount request can't be handled
1771 * immediately ("fg/bg" option)
1772 *
1773 * + retry: how often to retry a mount request ("retry=" option)
1774 *
1775 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1776 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1777 */
2283f8d6
TT		 1778static int nfs_validate_mount_data(void *options,
1779 struct nfs_parsed_mount_data *args,
136d558c
CL		 1780 struct nfs_fh *mntfh,
1781 const char *dev_name)
f7b422b1 1782{
2283f8d6 1783 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1784 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1785
5df36e78
CL		 1786 if (data == NULL)
1787 goto out_no_data;
f7b422b1 1788
54ceac45 1789 switch (data->version) {
5df36e78
CL		 1790 case 1:
1791 data->namlen = 0;
1792 case 2:
1793 data->bsize = 0;
1794 case 3:
1795 if (data->flags & NFS_MOUNT_VER3)
1796 goto out_no_v3;
1797 data->root.size = NFS2_FHSIZE;
1798 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1799 case 4:
1800 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1801 goto out_no_sec;
1802 case 5:
1803 memset(data->context, 0, sizeof(data->context));
1804 case 6:
b7e24457
TM		 1805 if (data->flags & NFS_MOUNT_VER3) {
1806 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1807 goto out_invalid_fh;
5df36e78 1808 mntfh->size = data->root.size;
764302cc
CL		 1809 args->version = 3;
1810 } else {
5df36e78 1811 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1812 args->version = 2;
1813 }
5df36e78 1814
5df36e78
CL		 1815
1816 memcpy(mntfh->data, data->root.data, mntfh->size);
1817 if (mntfh->size < sizeof(mntfh->data))
1818 memset(mntfh->data + mntfh->size, 0,
1819 sizeof(mntfh->data) - mntfh->size);
6e88e061 1820
2283f8d6
TT		 1821 /*
1822 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1823 * can deal with.
1824 */
ff3525a5 1825 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1826 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1827 args->rsize = data->rsize;
1828 args->wsize = data->wsize;
2283f8d6
TT		 1829 args->timeo = data->timeo;
1830 args->retrans = data->retrans;
1831 args->acregmin = data->acregmin;
1832 args->acregmax = data->acregmax;
1833 args->acdirmin = data->acdirmin;
1834 args->acdirmax = data->acdirmax;
4c568017 1835
4cfd74fc 1836 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1837 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1838 if (!nfs_verify_server_address(sap))
4c568017
CL		 1839 goto out_no_address;
1840
2283f8d6 1841 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1842 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1843 /* N.B. caller will free nfs_server.hostname in all cases */
1844 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1845 args->namlen = data->namlen;
1846 args->bsize = data->bsize;
dd07c947
CL		 1847
1848 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1849 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1850 if (!args->nfs_server.hostname)
1851 goto out_nomem;
f9c3a380 1852
5eebde23
SJ		 1853 if (!(data->flags & NFS_MOUNT_NONLM))
1854 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1855 NFS_MOUNT_LOCAL_FCNTL);
1856 else
1857 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1858 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1859 /*
1860 * The legacy version 6 binary mount data from userspace has a
1861 * field used only to transport selinux information into the
1862 * the kernel. To continue to support that functionality we
1863 * have a touch of selinux knowledge here in the NFS code. The
1864 * userspace code converted context=blah to just blah so we are
1865 * converting back to the full string selinux understands.
1866 */
1867 if (data->context[0]){
1868#ifdef CONFIG_SECURITY_SELINUX
1869 int rc;
1870 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1871 if (!opts_str)
1872 return -ENOMEM;
1873 strcpy(opts_str, "context=");
1874 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1875 strcat(opts_str, &data->context[0]);
1876 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1877 kfree(opts_str);
1878 if (rc)
1879 return rc;
1880#else
1881 return -EINVAL;
1882#endif
1883 }
1884
5df36e78 1885 break;
136d558c 1886 default: {
136d558c 1887 int status;
136d558c 1888
2283f8d6
TT		 1889 if (nfs_parse_mount_options((char *)options, args) == 0)
1890 return -EINVAL;
136d558c 1891
4cfd74fc 1892 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1893 goto out_no_address;
1894
764302cc
CL		 1895 if (args->version == 4)
1896#ifdef CONFIG_NFS_V4
1897 return nfs4_validate_text_mount_data(options,
1898 args, dev_name);
1899#else
1900 goto out_v4_not_compiled;
1901#endif
1902
f5855fec 1903 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1904
259875ef
TM		 1905 nfs_set_mount_transport_protocol(args);
1906
dc045898
CL		 1907 status = nfs_parse_devname(dev_name,
1908 &args->nfs_server.hostname,
1909 PAGE_SIZE,
1910 &args->nfs_server.export_path,
1911 NFS_MAXPATHLEN);
1912 if (!status)
1913 status = nfs_try_mount(args, mntfh);
136d558c 1914
dc045898
CL		 1915 kfree(args->nfs_server.export_path);
1916 args->nfs_server.export_path = NULL;
136d558c 1917
136d558c 1918 if (status)
fdc6e2c8 1919 return status;
136d558c 1920
136d558c
CL		 1921 break;
1922 }
f7b422b1 1923 }
54ceac45
DH		 1924
1925#ifndef CONFIG_NFS_V3
8a6e5deb 1926 if (args->version == 3)
5df36e78
CL		 1927 goto out_v3_not_compiled;
1928#endif /* !CONFIG_NFS_V3 */
f7b422b1 1929
5df36e78 1930 return 0;
f7b422b1 1931
5df36e78
CL		 1932out_no_data:
1933 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1934 return -EINVAL;
54ceac45 1935
5df36e78
CL		 1936out_no_v3:
1937 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1938 data->version);
1939 return -EINVAL;
f7b422b1 1940
5df36e78
CL		 1941out_no_sec:
1942 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1943 return -EINVAL;
1944
5df36e78
CL		 1945#ifndef CONFIG_NFS_V3
1946out_v3_not_compiled:
1947 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1948 return -EPROTONOSUPPORT;
1949#endif /* !CONFIG_NFS_V3 */
1950
764302cc
CL		 1951#ifndef CONFIG_NFS_V4
1952out_v4_not_compiled:
1953 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1954 return -EPROTONOSUPPORT;
1955#endif /* !CONFIG_NFS_V4 */
1956
63649bd7
CG		 1957out_nomem:
1958 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1959 return -ENOMEM;
1960
5df36e78
CL		 1961out_no_address:
1962 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1963 return -EINVAL;
1964
1965out_invalid_fh:
1966 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1967 return -EINVAL;
f7b422b1
DH		 1968}
1969
48b605f8
JL		 1970static int
1971nfs_compare_remount_data(struct nfs_server *nfss,
1972 struct nfs_parsed_mount_data *data)
1973{
1974 if (data->flags != nfss->flags ||
1975 data->rsize != nfss->rsize ||
1976 data->wsize != nfss->wsize ||
1977 data->retrans != nfss->client->cl_timeout->to_retries ||
1978 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1979 data->acregmin != nfss->acregmin / HZ ||
1980 data->acregmax != nfss->acregmax / HZ ||
1981 data->acdirmin != nfss->acdirmin / HZ ||
1982 data->acdirmax != nfss->acdirmax / HZ ||
1983 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1984 data->nfs_server.port != nfss->port ||
48b605f8 1985 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1986 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1987 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1988 return -EINVAL;
1989
1990 return 0;
1991}
1992
1993static int
1994nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1995{
1996 int error;
1997 struct nfs_server *nfss = sb->s_fs_info;
1998 struct nfs_parsed_mount_data *data;
1999 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2000 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2001 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2002
2003 /*
2004 * Userspace mount programs that send binary options generally send
2005 * them populated with default values. We have no way to know which
2006 * ones were explicitly specified. Fall back to legacy behavior and
2007 * just return success.
2008 */
31c94469
MZ		 2009 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2010 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2011 options->version <= 6))))
48b605f8
JL		 2012 return 0;
2013
2014 data = kzalloc(sizeof(*data), GFP_KERNEL);
2015 if (data == NULL)
2016 return -ENOMEM;
2017
2018 /* fill out struct with values from existing mount */
2019 data->flags = nfss->flags;
2020 data->rsize = nfss->rsize;
2021 data->wsize = nfss->wsize;
2022 data->retrans = nfss->client->cl_timeout->to_retries;
2023 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2024 data->acregmin = nfss->acregmin / HZ;
2025 data->acregmax = nfss->acregmax / HZ;
2026 data->acdirmin = nfss->acdirmin / HZ;
2027 data->acdirmax = nfss->acdirmax / HZ;
2028 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2029 data->nfs_server.port = nfss->port;
48b605f8
JL		 2030 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2031 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2032 data->nfs_server.addrlen);
2033
2034 /* overwrite those values with any that were specified */
2035 error = nfs_parse_mount_options((char *)options, data);
2036 if (error < 0)
2037 goto out;
2038
26c4c170
JL		 2039 /*
2040 * noac is a special case. It implies -o sync, but that's not
2041 * necessarily reflected in the mtab options. do_remount_sb
2042 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2043 * remount options, so we have to explicitly reset it.
2044 */
2045 if (data->flags & NFS_MOUNT_NOAC)
2046 *flags |= MS_SYNCHRONOUS;
2047
48b605f8
JL		 2048 /* compare new mount options with old ones */
2049 error = nfs_compare_remount_data(nfss, data);
2050out:
2051 kfree(data);
2052 return error;
2053}
2054
f7b422b1 2055/*
54ceac45 2056 * Initialise the common bits of the superblock
f7b422b1 2057 */
54ceac45 2058static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2059{
54ceac45 2060 struct nfs_server *server = NFS_SB(sb);
5006a76c 2061
54ceac45 2062 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2063
54ceac45
DH		 2064 /* We probably want something more informative here */
2065 snprintf(sb->s_id, sizeof(sb->s_id),
2066 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2067
54ceac45
DH		 2068 if (sb->s_blocksize == 0)
2069 sb->s_blocksize = nfs_block_bits(server->wsize,
2070 &sb->s_blocksize_bits);
f7b422b1 2071
32a88aa1
JA		 2072 sb->s_bdi = &server->backing_dev_info;
2073
54ceac45 2074 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2075}
2076
2077/*
54ceac45 2078 * Finish setting up an NFS2/3 superblock
f7b422b1 2079 */
2283f8d6
TT		 2080static void nfs_fill_super(struct super_block *sb,
2081 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2082{
2083 struct nfs_server *server = NFS_SB(sb);
5006a76c 2084
54ceac45
DH		 2085 sb->s_blocksize_bits = 0;
2086 sb->s_blocksize = 0;
2087 if (data->bsize)
2088 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2089
8a6e5deb 2090 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2091 /* The VFS shouldn't apply the umask to mode bits. We will do
2092 * so ourselves when necessary.
2093 */
2094 sb->s_flags |= MS_POSIXACL;
2095 sb->s_time_gran = 1;
816724e6 2096 }
54ceac45
DH		 2097
2098 sb->s_op = &nfs_sops;
2099 nfs_initialise_sb(sb);
f7b422b1
DH		 2100}
2101
2102/*
54ceac45 2103 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2104 */
54ceac45
DH		 2105static void nfs_clone_super(struct super_block *sb,
2106 const struct super_block *old_sb)
f7b422b1 2107{
54ceac45
DH		 2108 struct nfs_server *server = NFS_SB(sb);
2109
2110 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2111 sb->s_blocksize = old_sb->s_blocksize;
2112 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2113
8a6e5deb 2114 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2115 /* The VFS shouldn't apply the umask to mode bits. We will do
2116 * so ourselves when necessary.
f7b422b1
DH		 2117 */
2118 sb->s_flags |= MS_POSIXACL;
f7b422b1 2119 sb->s_time_gran = 1;
f7b422b1
DH		 2120 }
2121
54ceac45
DH		 2122 sb->s_op = old_sb->s_op;
2123 nfs_initialise_sb(sb);
f7b422b1
DH		 2124}
2125
275a5d24
TM		 2126static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2127{
2128 const struct nfs_server *a = s->s_fs_info;
2129 const struct rpc_clnt *clnt_a = a->client;
2130 const struct rpc_clnt *clnt_b = b->client;
2131
2132 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2133 goto Ebusy;
2134 if (a->nfs_client != b->nfs_client)
2135 goto Ebusy;
2136 if (a->flags != b->flags)
2137 goto Ebusy;
2138 if (a->wsize != b->wsize)
2139 goto Ebusy;
2140 if (a->rsize != b->rsize)
2141 goto Ebusy;
2142 if (a->acregmin != b->acregmin)
2143 goto Ebusy;
2144 if (a->acregmax != b->acregmax)
2145 goto Ebusy;
2146 if (a->acdirmin != b->acdirmin)
2147 goto Ebusy;
2148 if (a->acdirmax != b->acdirmax)
2149 goto Ebusy;
2150 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2151 goto Ebusy;
e89a5a43 2152 return 1;
275a5d24 2153Ebusy:
e89a5a43
TM		 2154 return 0;
2155}
2156
2157struct nfs_sb_mountdata {
2158 struct nfs_server *server;
2159 int mntflags;
2160};
2161
2162static int nfs_set_super(struct super_block *s, void *data)
2163{
2164 struct nfs_sb_mountdata *sb_mntdata = data;
2165 struct nfs_server *server = sb_mntdata->server;
2166 int ret;
2167
2168 s->s_flags = sb_mntdata->mntflags;
2169 s->s_fs_info = server;
8b244ff2 2170 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2171 ret = set_anon_super(s, server);
2172 if (ret == 0)
2173 server->s_dev = s->s_dev;
2174 return ret;
2175}
2176
fd00a8ff
CL		 2177static int nfs_compare_super_address(struct nfs_server *server1,
2178 struct nfs_server *server2)
2179{
2180 struct sockaddr *sap1, *sap2;
2181
2182 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2183 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2184
2185 if (sap1->sa_family != sap2->sa_family)
2186 return 0;
2187
2188 switch (sap1->sa_family) {
2189 case AF_INET: {
2190 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2191 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2192 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2193 return 0;
2194 if (sin1->sin_port != sin2->sin_port)
2195 return 0;
2196 break;
2197 }
2198 case AF_INET6: {
2199 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2200 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2201 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2202 return 0;
2203 if (sin1->sin6_port != sin2->sin6_port)
2204 return 0;
2205 break;
2206 }
2207 default:
2208 return 0;
2209 }
2210
2211 return 1;
2212}
2213
e89a5a43
TM		 2214static int nfs_compare_super(struct super_block *sb, void *data)
2215{
2216 struct nfs_sb_mountdata *sb_mntdata = data;
2217 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2218 int mntflags = sb_mntdata->mntflags;
2219
fd00a8ff 2220 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2221 return 0;
2222 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2223 if (old->flags & NFS_MOUNT_UNSHARED)
2224 return 0;
2225 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2226 return 0;
2227 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2228}
2229
fa799759
MS		 2230static int nfs_bdi_register(struct nfs_server *server)
2231{
2232 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2233}
2234
01194981
AV		 2235static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2236 int flags, const char *dev_name, void *raw_data)
f7b422b1 2237{
f7b422b1
DH		 2238 struct nfs_server *server = NULL;
2239 struct super_block *s;
33852a1f
TM		 2240 struct nfs_parsed_mount_data *data;
2241 struct nfs_fh *mntfh;
01194981 2242 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2243 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2244 struct nfs_sb_mountdata sb_mntdata = {
2245 .mntflags = flags,
2246 };
01194981 2247 int error;
33852a1f 2248
1e657bd5 2249 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2250 mntfh = nfs_alloc_fhandle();
33852a1f 2251 if (data == NULL || mntfh == NULL)
8a0d551a 2252 goto out;
f9c3a380 2253
54ceac45 2254 /* Validate the mount data */
33852a1f 2255 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2256 if (error < 0) {
2257 mntroot = ERR_PTR(error);
0655960f 2258 goto out;
01194981 2259 }
f7b422b1 2260
764302cc
CL		 2261#ifdef CONFIG_NFS_V4
2262 if (data->version == 4) {
01194981 2263 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2264 goto out;
2265 }
2266#endif /* CONFIG_NFS_V4 */
2267
54ceac45 2268 /* Get a volume representation */
33852a1f 2269 server = nfs_create_server(data, mntfh);
54ceac45 2270 if (IS_ERR(server)) {
01194981 2271 mntroot = ERR_CAST(server);
0655960f 2272 goto out;
f7b422b1 2273 }
e89a5a43 2274 sb_mntdata.server = server;
f7b422b1 2275
75180df2
TM		 2276 if (server->flags & NFS_MOUNT_UNSHARED)
2277 compare_super = NULL;
2278
fb2088cc
SP		 2279 /* -o noac implies -o sync */
2280 if (server->flags & NFS_MOUNT_NOAC)
2281 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2282
54ceac45 2283 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2284 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2285 if (IS_ERR(s)) {
01194981 2286 mntroot = ERR_CAST(s);
54ceac45 2287 goto out_err_nosb;
816724e6
TM		 2288 }
2289
54ceac45
DH		 2290 if (s->s_fs_info != server) {
2291 nfs_free_server(server);
2292 server = NULL;
fa799759
MS		 2293 } else {
2294 error = nfs_bdi_register(server);
01194981
AV		 2295 if (error) {
2296 mntroot = ERR_PTR(error);
cfbc0683 2297 goto error_splat_bdi;
01194981 2298 }
54ceac45 2299 }
f7b422b1 2300
54ceac45
DH		 2301 if (!s->s_root) {
2302 /* initial superblock/root creation */
33852a1f 2303 nfs_fill_super(s, data);
160bc160 2304 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2305 }
f7b422b1 2306
0d5839ad 2307 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2308 if (IS_ERR(mntroot))
54ceac45 2309 goto error_splat_super;
816724e6 2310
33852a1f 2311 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2312 if (error)
2313 goto error_splat_root;
2314
54ceac45 2315 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2316
2317out:
8a0d551a 2318 nfs_free_parsed_mount_data(data);
b157b06c 2319 nfs_free_fhandle(mntfh);
01194981 2320 return mntroot;
816724e6 2321
54ceac45
DH		 2322out_err_nosb:
2323 nfs_free_server(server);
0655960f 2324 goto out;
54ceac45 2325
f9c3a380
EP		 2326error_splat_root:
2327 dput(mntroot);
01194981 2328 mntroot = ERR_PTR(error);
54ceac45 2329error_splat_super:
cfbc0683
N		 2330 if (server && !s->s_root)
2331 bdi_unregister(&server->backing_dev_info);
2332error_splat_bdi:
6f5bbff9 2333 deactivate_locked_super(s);
0655960f 2334 goto out;
f7b422b1
DH		 2335}
2336
387c149b
TM		 2337/*
2338 * Ensure that we unregister the bdi before kill_anon_super
2339 * releases the device name
2340 */
2341static void nfs_put_super(struct super_block *s)
2342{
2343 struct nfs_server *server = NFS_SB(s);
2344
2345 bdi_unregister(&server->backing_dev_info);
2346}
2347
54ceac45
DH		 2348/*
2349 * Destroy an NFS2/3 superblock
2350 */
f7b422b1
DH		 2351static void nfs_kill_super(struct super_block *s)
2352{
2353 struct nfs_server *server = NFS_SB(s);
2354
2355 kill_anon_super(s);
08734048 2356 nfs_fscache_release_super_cookie(s);
54ceac45 2357 nfs_free_server(server);
f7b422b1
DH		 2358}
2359
54ceac45
DH		 2360/*
2361 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2362 */
31f43471
AV		 2363static struct dentry *
2364nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2365 const char *dev_name, void *raw_data)
f7b422b1
DH		 2366{
2367 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2368 struct super_block *s;
2369 struct nfs_server *server;
2370 struct dentry *mntroot;
75180df2 2371 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2372 struct nfs_sb_mountdata sb_mntdata = {
2373 .mntflags = flags,
2374 };
54ceac45 2375 int error;
f7b422b1 2376
31f43471 2377 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2378
54ceac45
DH		 2379 /* create a new volume representation */
2380 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2381 if (IS_ERR(server)) {
2382 error = PTR_ERR(server);
2383 goto out_err_noserver;
2384 }
e89a5a43 2385 sb_mntdata.server = server;
8fa5c000 2386
75180df2
TM		 2387 if (server->flags & NFS_MOUNT_UNSHARED)
2388 compare_super = NULL;
2389
fb2088cc
SP		 2390 /* -o noac implies -o sync */
2391 if (server->flags & NFS_MOUNT_NOAC)
2392 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2393
54ceac45 2394 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2395 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2396 if (IS_ERR(s)) {
2397 error = PTR_ERR(s);
2398 goto out_err_nosb;
2399 }
5006a76c 2400
54ceac45
DH		 2401 if (s->s_fs_info != server) {
2402 nfs_free_server(server);
2403 server = NULL;
fa799759
MS		 2404 } else {
2405 error = nfs_bdi_register(server);
2406 if (error)
cfbc0683 2407 goto error_splat_bdi;
f7b422b1 2408 }
24c8dbbb 2409
54ceac45
DH		 2410 if (!s->s_root) {
2411 /* initial superblock/root creation */
54ceac45 2412 nfs_clone_super(s, data->sb);
2df54806 2413 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2414 }
f7b422b1 2415
0d5839ad 2416 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2417 if (IS_ERR(mntroot)) {
2418 error = PTR_ERR(mntroot);
2419 goto error_splat_super;
f7b422b1 2420 }
e9cc6c23 2421 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2422 dput(mntroot);
2423 error = -ESTALE;
2424 goto error_splat_super;
2425 }
f7b422b1 2426
54ceac45 2427 s->s_flags |= MS_ACTIVE;
f7b422b1 2428
f9c3a380
EP		 2429 /* clone any lsm security options from the parent to the new sb */
2430 security_sb_clone_mnt_opts(data->sb, s);
2431
31f43471
AV		 2432 dprintk("<-- nfs_xdev_mount() = 0\n");
2433 return mntroot;
24c8dbbb 2434
54ceac45
DH		 2435out_err_nosb:
2436 nfs_free_server(server);
2437out_err_noserver:
31f43471
AV		 2438 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2439 return ERR_PTR(error);
f7b422b1 2440
54ceac45 2441error_splat_super:
cfbc0683
N		 2442 if (server && !s->s_root)
2443 bdi_unregister(&server->backing_dev_info);
2444error_splat_bdi:
6f5bbff9 2445 deactivate_locked_super(s);
31f43471
AV		 2446 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2447 return ERR_PTR(error);
f7b422b1
DH		 2448}
2449
54ceac45
DH		 2450#ifdef CONFIG_NFS_V4
2451
f7b422b1 2452/*
54ceac45 2453 * Finish setting up a cloned NFS4 superblock
f7b422b1 2454 */
54ceac45
DH		 2455static void nfs4_clone_super(struct super_block *sb,
2456 const struct super_block *old_sb)
f7b422b1 2457{
54ceac45
DH		 2458 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2459 sb->s_blocksize = old_sb->s_blocksize;
2460 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2461 sb->s_time_gran = 1;
54ceac45 2462 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2463 /*
2464 * The VFS shouldn't apply the umask to mode bits. We will do
2465 * so ourselves when necessary.
2466 */
2467 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2468 sb->s_xattr = old_sb->s_xattr;
2469 nfs_initialise_sb(sb);
f7b422b1
DH		 2470}
2471
54ceac45
DH		 2472/*
2473 * Set up an NFS4 superblock
2474 */
2475static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2476{
54ceac45
DH		 2477 sb->s_time_gran = 1;
2478 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2479 /*
2480 * The VFS shouldn't apply the umask to mode bits. We will do
2481 * so ourselves when necessary.
2482 */
2483 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2484 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2485 nfs_initialise_sb(sb);
f7b422b1
DH		 2486}
2487
01c3f052
TM		 2488static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2489{
5eebde23
SJ		 2490 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2491 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2492}
2493
7630c852
CL		 2494static int nfs4_validate_text_mount_data(void *options,
2495 struct nfs_parsed_mount_data *args,
2496 const char *dev_name)
2497{
2498 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2499
f5855fec 2500 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2501
2502 nfs_validate_transport_protocol(args);
2503
2504 nfs4_validate_mount_flags(args);
2505
2ecda72b
TM		 2506 if (args->version != 4) {
2507 dfprintk(MOUNT,
2508 "NFS4: Illegal mount version\n");
2509 return -EINVAL;
2510 }
2511
7630c852
CL		 2512 if (args->auth_flavor_len > 1) {
2513 dfprintk(MOUNT,
2514 "NFS4: Too many RPC auth flavours specified\n");
2515 return -EINVAL;
2516 }
2517
2518 if (args->client_address == NULL) {
2519 dfprintk(MOUNT,
2520 "NFS4: mount program didn't pass callback address\n");
2521 return -EINVAL;
2522 }
2523
2524 return nfs_parse_devname(dev_name,
2525 &args->nfs_server.hostname,
2526 NFS4_MAXNAMLEN,
2527 &args->nfs_server.export_path,
2528 NFS4_MAXPATHLEN);
2529}
2530
f0768ebd
CL		 2531/*
2532 * Validate NFSv4 mount options
2533 */
91ea40b9
TT		 2534static int nfs4_validate_mount_data(void *options,
2535 struct nfs_parsed_mount_data *args,
2536 const char *dev_name)
f0768ebd 2537{
4cfd74fc 2538 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2539 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2540 char *c;
2541
2542 if (data == NULL)
2543 goto out_no_data;
2544
2545 switch (data->version) {
2546 case 1:
4c568017
CL		 2547 if (data->host_addrlen > sizeof(args->nfs_server.address))
2548 goto out_no_address;
2549 if (data->host_addrlen == 0)
f0768ebd 2550 goto out_no_address;
4c568017 2551 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2552 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2553 return -EFAULT;
4cfd74fc 2554 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2555 goto out_no_address;
2556
6738b251
CL		 2557 if (data->auth_flavourlen) {
2558 if (data->auth_flavourlen > 1)
2559 goto out_inval_auth;
20c71f5e 2560 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2561 data->auth_flavours,
20c71f5e 2562 sizeof(args->auth_flavors[0])))
f0768ebd 2563 return -EFAULT;
f0768ebd
CL		 2564 }
2565
2566 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2567 if (IS_ERR(c))
2568 return PTR_ERR(c);
91ea40b9 2569 args->nfs_server.hostname = c;
f0768ebd
CL		 2570
2571 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2572 if (IS_ERR(c))
2573 return PTR_ERR(c);
91ea40b9
TT		 2574 args->nfs_server.export_path = c;
2575 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2576
2577 c = strndup_user(data->client_addr.data, 16);
2578 if (IS_ERR(c))
2579 return PTR_ERR(c);
91ea40b9
TT		 2580 args->client_address = c;
2581
2582 /*
2583 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2584 * can deal with.
2585 */
2586
2587 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2588 args->rsize = data->rsize;
2589 args->wsize = data->wsize;
2590 args->timeo = data->timeo;
2591 args->retrans = data->retrans;
2592 args->acregmin = data->acregmin;
2593 args->acregmax = data->acregmax;
2594 args->acdirmin = data->acdirmin;
2595 args->acdirmax = data->acdirmax;
2596 args->nfs_server.protocol = data->proto;
259875ef 2597 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2598
2599 break;
7630c852 2600 default:
91ea40b9 2601 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2602 return -EINVAL;
2603
4cfd74fc 2604 if (!nfs_verify_server_address(sap))
80071225 2605 return -EINVAL;
dc045898 2606
7630c852 2607 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2608 }
2609
2610 return 0;
2611
2612out_no_data:
2613 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2614 return -EINVAL;
2615
2616out_inval_auth:
2617 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2618 data->auth_flavourlen);
2619 return -EINVAL;
2620
2621out_no_address:
2622 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2623 return -EINVAL;
f0768ebd
CL		 2624}
2625
54ceac45 2626/*
c02d7adf 2627 * Get the superblock for the NFS4 root partition
54ceac45 2628 */
31f43471
AV		 2629static struct dentry *
2630nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2631 const char *dev_name, void *raw_data)
f7b422b1 2632{
c02d7adf 2633 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2634 struct super_block *s;
2635 struct nfs_server *server;
33852a1f 2636 struct nfs_fh *mntfh;
54ceac45 2637 struct dentry *mntroot;
75180df2 2638 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2639 struct nfs_sb_mountdata sb_mntdata = {
2640 .mntflags = flags,
2641 };
33852a1f
TM		 2642 int error = -ENOMEM;
2643
b157b06c 2644 mntfh = nfs_alloc_fhandle();
33852a1f 2645 if (data == NULL || mntfh == NULL)
8a0d551a 2646 goto out;
f9c3a380 2647
54ceac45 2648 /* Get a volume representation */
33852a1f 2649 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2650 if (IS_ERR(server)) {
2651 error = PTR_ERR(server);
29eb981a 2652 goto out;
f7b422b1 2653 }
e89a5a43 2654 sb_mntdata.server = server;
f7b422b1 2655
75180df2
TM		 2656 if (server->flags & NFS4_MOUNT_UNSHARED)
2657 compare_super = NULL;
2658
fb2088cc
SP		 2659 /* -o noac implies -o sync */
2660 if (server->flags & NFS_MOUNT_NOAC)
2661 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2662
54ceac45 2663 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2664 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2665 if (IS_ERR(s)) {
2666 error = PTR_ERR(s);
f7b422b1 2667 goto out_free;
816724e6
TM		 2668 }
2669
5dd3177a
TM		 2670 if (s->s_fs_info != server) {
2671 nfs_free_server(server);
2672 server = NULL;
fa799759
MS		 2673 } else {
2674 error = nfs_bdi_register(server);
2675 if (error)
cfbc0683 2676 goto error_splat_bdi;
5dd3177a
TM		 2677 }
2678
54ceac45
DH		 2679 if (!s->s_root) {
2680 /* initial superblock/root creation */
54ceac45 2681 nfs4_fill_super(s);
c15c928f 2682 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2683 }
f7b422b1 2684
0d5839ad 2685 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2686 if (IS_ERR(mntroot)) {
2687 error = PTR_ERR(mntroot);
2688 goto error_splat_super;
f7b422b1 2689 }
54ceac45 2690
33852a1f 2691 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2692 if (error)
2693 goto error_splat_root;
2694
f7b422b1 2695 s->s_flags |= MS_ACTIVE;
31f43471 2696
31f43471
AV		 2697 nfs_free_fhandle(mntfh);
2698 return mntroot;
29eb981a
CL		 2699
2700out:
b157b06c 2701 nfs_free_fhandle(mntfh);
31f43471 2702 return ERR_PTR(error);
54ceac45 2703
f7b422b1 2704out_free:
54ceac45 2705 nfs_free_server(server);
29eb981a 2706 goto out;
54ceac45 2707
46c8ac74
EP		 2708error_splat_root:
2709 dput(mntroot);
54ceac45 2710error_splat_super:
cfbc0683
N		 2711 if (server && !s->s_root)
2712 bdi_unregister(&server->backing_dev_info);
2713error_splat_bdi:
6f5bbff9 2714 deactivate_locked_super(s);
29eb981a 2715 goto out;
f7b422b1
DH		 2716}
2717
c02d7adf
TM		 2718static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2719 int flags, void *data, const char *hostname)
2720{
2721 struct vfsmount *root_mnt;
2722 char *root_devname;
2723 size_t len;
2724
2725 len = strlen(hostname) + 3;
2726 root_devname = kmalloc(len, GFP_KERNEL);
2727 if (root_devname == NULL)
2728 return ERR_PTR(-ENOMEM);
2729 snprintf(root_devname, len, "%s:/", hostname);
2730 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2731 kfree(root_devname);
2732 return root_mnt;
2733}
2734
ce587e07
TM		 2735struct nfs_referral_count {
2736 struct list_head list;
2737 const struct task_struct *task;
2738 unsigned int referral_count;
2739};
2740
2741static LIST_HEAD(nfs_referral_count_list);
2742static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2743
2744static struct nfs_referral_count *nfs_find_referral_count(void)
2745{
2746 struct nfs_referral_count *p;
2747
2748 list_for_each_entry(p, &nfs_referral_count_list, list) {
2749 if (p->task == current)
2750 return p;
2751 }
2752 return NULL;
2753}
2754
2755#define NFS_MAX_NESTED_REFERRALS 2
2756
2757static int nfs_referral_loop_protect(void)
2758{
2759 struct nfs_referral_count *p, *new;
2760 int ret = -ENOMEM;
2761
2762 new = kmalloc(sizeof(*new), GFP_KERNEL);
2763 if (!new)
2764 goto out;
2765 new->task = current;
2766 new->referral_count = 1;
2767
2768 ret = 0;
2769 spin_lock(&nfs_referral_count_list_lock);
2770 p = nfs_find_referral_count();
2771 if (p != NULL) {
2772 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2773 ret = -ELOOP;
2774 else
2775 p->referral_count++;
2776 } else {
2777 list_add(&new->list, &nfs_referral_count_list);
2778 new = NULL;
2779 }
2780 spin_unlock(&nfs_referral_count_list_lock);
2781 kfree(new);
2782out:
2783 return ret;
2784}
2785
2786static void nfs_referral_loop_unprotect(void)
2787{
2788 struct nfs_referral_count *p;
2789
2790 spin_lock(&nfs_referral_count_list_lock);
2791 p = nfs_find_referral_count();
2792 p->referral_count--;
2793 if (p->referral_count == 0)
2794 list_del(&p->list);
2795 else
2796 p = NULL;
2797 spin_unlock(&nfs_referral_count_list_lock);
2798 kfree(p);
2799}
2800
01194981
AV		 2801static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2802 const char *export_path)
c02d7adf 2803{
01194981 2804 struct dentry *dentry;
5352d3b6 2805 int err;
c02d7adf 2806
5352d3b6
AV		 2807 if (IS_ERR(root_mnt))
2808 return ERR_CAST(root_mnt);
2809
2810 err = nfs_referral_loop_protect();
2811 if (err) {
ea441d11 2812 mntput(root_mnt);
5352d3b6 2813 return ERR_PTR(err);
ea441d11 2814 }
c02d7adf 2815
ea441d11
AV		 2816 dentry = mount_subtree(root_mnt, export_path);
2817 nfs_referral_loop_unprotect();
c02d7adf 2818
01194981 2819 return dentry;
c02d7adf
TM		 2820}
2821
01194981
AV		 2822static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2823 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2824{
2825 char *export_path;
2826 struct vfsmount *root_mnt;
01194981 2827 struct dentry *res;
a6fe23be
CL		 2828
2829 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2830
2831 export_path = data->nfs_server.export_path;
2832 data->nfs_server.export_path = "/";
2833 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2834 data->nfs_server.hostname);
2835 data->nfs_server.export_path = export_path;
2836
5352d3b6 2837 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2838
01194981
AV		 2839 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2840 IS_ERR(res) ? PTR_ERR(res) : 0,
2841 IS_ERR(res) ? " [error]" : "");
2842 return res;
a6fe23be
CL		 2843}
2844
c02d7adf
TM		 2845/*
2846 * Get the superblock for an NFS4 mountpoint
2847 */
01194981
AV		 2848static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2849 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2850{
2851 struct nfs_parsed_mount_data *data;
c02d7adf 2852 int error = -ENOMEM;
01194981 2853 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2854
c5811dbd 2855 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2856 if (data == NULL)
8a0d551a 2857 goto out;
c02d7adf
TM		 2858
2859 /* Validate the mount data */
2860 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2861 if (error < 0) {
2862 res = ERR_PTR(error);
c02d7adf 2863 goto out;
01194981 2864 }
c02d7adf 2865
01194981
AV		 2866 res = nfs4_try_mount(flags, dev_name, data);
2867 if (IS_ERR(res))
2868 error = PTR_ERR(res);
c02d7adf
TM		 2869
2870out:
8a0d551a 2871 nfs_free_parsed_mount_data(data);
01194981 2872 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2873 error != 0 ? " [error]" : "");
01194981 2874 return res;
c02d7adf
TM		 2875}
2876
f7b422b1
DH		 2877static void nfs4_kill_super(struct super_block *sb)
2878{
2879 struct nfs_server *server = NFS_SB(sb);
2880
0f3e66c6 2881 dprintk("--> %s\n", __func__);
515d8611 2882 nfs_super_return_all_delegations(sb);
f7b422b1 2883 kill_anon_super(sb);
08734048 2884 nfs_fscache_release_super_cookie(sb);
54ceac45 2885 nfs_free_server(server);
0f3e66c6 2886 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2887}
2888
2889/*
54ceac45 2890 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2891 */
31f43471
AV		 2892static struct dentry *
2893nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2894 const char *dev_name, void *raw_data)
f7b422b1 2895{
54ceac45
DH		 2896 struct nfs_clone_mount *data = raw_data;
2897 struct super_block *s;
2898 struct nfs_server *server;
2899 struct dentry *mntroot;
75180df2 2900 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2901 struct nfs_sb_mountdata sb_mntdata = {
2902 .mntflags = flags,
2903 };
54ceac45 2904 int error;
f7b422b1 2905
31f43471 2906 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2907
54ceac45
DH		 2908 /* create a new volume representation */
2909 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2910 if (IS_ERR(server)) {
2911 error = PTR_ERR(server);
2912 goto out_err_noserver;
f7b422b1 2913 }
e89a5a43 2914 sb_mntdata.server = server;
f7b422b1 2915
75180df2
TM		 2916 if (server->flags & NFS4_MOUNT_UNSHARED)
2917 compare_super = NULL;
2918
fb2088cc
SP		 2919 /* -o noac implies -o sync */
2920 if (server->flags & NFS_MOUNT_NOAC)
2921 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2922
54ceac45 2923 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2924 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2925 if (IS_ERR(s)) {
2926 error = PTR_ERR(s);
2927 goto out_err_nosb;
f7b422b1 2928 }
f7b422b1 2929
54ceac45
DH		 2930 if (s->s_fs_info != server) {
2931 nfs_free_server(server);
2932 server = NULL;
fa799759
MS		 2933 } else {
2934 error = nfs_bdi_register(server);
2935 if (error)
cfbc0683 2936 goto error_splat_bdi;
54ceac45 2937 }
f7b422b1 2938
54ceac45
DH		 2939 if (!s->s_root) {
2940 /* initial superblock/root creation */
54ceac45 2941 nfs4_clone_super(s, data->sb);
2df54806 2942 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2943 }
f7b422b1 2944
0d5839ad 2945 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 2946 if (IS_ERR(mntroot)) {
2947 error = PTR_ERR(mntroot);
2948 goto error_splat_super;
2949 }
e9cc6c23
TM		 2950 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2951 dput(mntroot);
2952 error = -ESTALE;
2953 goto error_splat_super;
2954 }
f7b422b1 2955
54ceac45 2956 s->s_flags |= MS_ACTIVE;
54ceac45 2957
46c8ac74
EP		 2958 security_sb_clone_mnt_opts(data->sb, s);
2959
31f43471
AV		 2960 dprintk("<-- nfs4_xdev_mount() = 0\n");
2961 return mntroot;
54ceac45
DH		 2962
2963out_err_nosb:
2964 nfs_free_server(server);
2965out_err_noserver:
31f43471
AV		 2966 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2967 return ERR_PTR(error);
54ceac45
DH		 2968
2969error_splat_super:
cfbc0683
N		 2970 if (server && !s->s_root)
2971 bdi_unregister(&server->backing_dev_info);
2972error_splat_bdi:
6f5bbff9 2973 deactivate_locked_super(s);
31f43471
AV		 2974 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2975 return ERR_PTR(error);
f7b422b1
DH		 2976}
2977
31f43471
AV		 2978static struct dentry *
2979nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2980 const char *dev_name, void *raw_data)
f7b422b1
DH		 2981{
2982 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2983 struct super_block *s;
2984 struct nfs_server *server;
2985 struct dentry *mntroot;
4f727296 2986 struct nfs_fh *mntfh;
75180df2 2987 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2988 struct nfs_sb_mountdata sb_mntdata = {
2989 .mntflags = flags,
2990 };
4f727296 2991 int error = -ENOMEM;
54ceac45
DH		 2992
2993 dprintk("--> nfs4_referral_get_sb()\n");
2994
4f727296
TM		 2995 mntfh = nfs_alloc_fhandle();
2996 if (mntfh == NULL)
2997 goto out_err_nofh;
2998
54ceac45 2999 /* create a new volume representation */
4f727296 3000 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3001 if (IS_ERR(server)) {
3002 error = PTR_ERR(server);
3003 goto out_err_noserver;
3004 }
e89a5a43 3005 sb_mntdata.server = server;
54ceac45 3006
75180df2
TM		 3007 if (server->flags & NFS4_MOUNT_UNSHARED)
3008 compare_super = NULL;
3009
fb2088cc
SP		 3010 /* -o noac implies -o sync */
3011 if (server->flags & NFS_MOUNT_NOAC)
3012 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3013
54ceac45 3014 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3015 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3016 if (IS_ERR(s)) {
3017 error = PTR_ERR(s);
3018 goto out_err_nosb;
3019 }
3020
3021 if (s->s_fs_info != server) {
3022 nfs_free_server(server);
3023 server = NULL;
fa799759
MS		 3024 } else {
3025 error = nfs_bdi_register(server);
3026 if (error)
cfbc0683 3027 goto error_splat_bdi;
54ceac45
DH		 3028 }
3029
3030 if (!s->s_root) {
3031 /* initial superblock/root creation */
54ceac45 3032 nfs4_fill_super(s);
2df54806 3033 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3034 }
3035
0d5839ad 3036 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3037 if (IS_ERR(mntroot)) {
3038 error = PTR_ERR(mntroot);
3039 goto error_splat_super;
3040 }
e9cc6c23
TM		 3041 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3042 dput(mntroot);
3043 error = -ESTALE;
3044 goto error_splat_super;
3045 }
54ceac45
DH		 3046
3047 s->s_flags |= MS_ACTIVE;
54ceac45 3048
46c8ac74
EP		 3049 security_sb_clone_mnt_opts(data->sb, s);
3050
4f727296 3051 nfs_free_fhandle(mntfh);
54ceac45 3052 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3053 return mntroot;
54ceac45
DH		 3054
3055out_err_nosb:
3056 nfs_free_server(server);
3057out_err_noserver:
4f727296
TM		 3058 nfs_free_fhandle(mntfh);
3059out_err_nofh:
54ceac45 3060 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3061 return ERR_PTR(error);
54ceac45
DH		 3062
3063error_splat_super:
cfbc0683
N		 3064 if (server && !s->s_root)
3065 bdi_unregister(&server->backing_dev_info);
3066error_splat_bdi:
6f5bbff9 3067 deactivate_locked_super(s);
4f727296 3068 nfs_free_fhandle(mntfh);
54ceac45 3069 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3070 return ERR_PTR(error);
f7b422b1
DH		 3071}
3072
c02d7adf
TM		 3073/*
3074 * Create an NFS4 server record on referral traversal
3075 */
01194981
AV		 3076static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3077 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3078{
3079 struct nfs_clone_mount *data = raw_data;
3080 char *export_path;
3081 struct vfsmount *root_mnt;
01194981 3082 struct dentry *res;
c02d7adf 3083
01194981 3084 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3085
3086 export_path = data->mnt_path;
3087 data->mnt_path = "/";
3088
3089 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3090 flags, data, data->hostname);
3091 data->mnt_path = export_path;
3092
5352d3b6 3093 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3094 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3095 IS_ERR(res) ? PTR_ERR(res) : 0,
3096 IS_ERR(res) ? " [error]" : "");
3097 return res;
c02d7adf
TM		 3098}
3099
54ceac45 3100#endif /* CONFIG_NFS_V4 */
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