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NFS: don't negotiate when user specifies sec flavor
[linux-2.6-block.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
TM		 44#include <linux/mnt_namespace.h>
45#include <linux/namei.h>
f7b422b1
DH		 46#include <linux/nfs_idmap.h>
47#include <linux/vfs.h>
48#include <linux/inet.h>
fd00a8ff 49#include <linux/in6.h>
5a0e3ad6 50#include <linux/slab.h>
fd00a8ff 51#include <net/ipv6.h>
d8e7748a 52#include <linux/netdevice.h>
f7b422b1 53#include <linux/nfs_xdr.h>
b5d5dfbd 54#include <linux/magic.h>
bf0fd768 55#include <linux/parser.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"
f7b422b1
DH		 66
67#define NFSDBG_FACILITY NFSDBG_VFS
68
1e657bd5
PZ		 69#ifdef CONFIG_NFS_V3
70#define NFS_DEFAULT_VERSION 3
71#else
72#define NFS_DEFAULT_VERSION 2
73#endif
74
bf0fd768
CL		 75enum {
76 /* Mount options that take no arguments */
77 Opt_soft, Opt_hard,
bf0fd768
CL		 78 Opt_posix, Opt_noposix,
79 Opt_cto, Opt_nocto,
80 Opt_ac, Opt_noac,
81 Opt_lock, Opt_nolock,
764302cc 82 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 83 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 84 Opt_acl, Opt_noacl,
85 Opt_rdirplus, Opt_nordirplus,
75180df2 86 Opt_sharecache, Opt_nosharecache,
d740351b 87 Opt_resvport, Opt_noresvport,
b797cac7 88 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 89
90 /* Mount options that take integer arguments */
91 Opt_port,
92 Opt_rsize, Opt_wsize, Opt_bsize,
93 Opt_timeo, Opt_retrans,
94 Opt_acregmin, Opt_acregmax,
95 Opt_acdirmin, Opt_acdirmax,
96 Opt_actimeo,
97 Opt_namelen,
98 Opt_mountport,
e887cbcf 99 Opt_mountvers,
ad879cef 100 Opt_nfsvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
33832034 104 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 105 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 106 Opt_lookupcache,
b797cac7 107 Opt_fscache_uniq,
5eebde23 108 Opt_local_lock,
bf0fd768 109
f45663ce
CL		 110 /* Special mount options */
111 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 112
113 Opt_err
114};
115
a447c093 116static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 117 { Opt_userspace, "bg" },
118 { Opt_userspace, "fg" },
ecbb3845
CL		 119 { Opt_userspace, "retry=%s" },
120
f45663ce
CL		 121 { Opt_sloppy, "sloppy" },
122
bf0fd768
CL		 123 { Opt_soft, "soft" },
124 { Opt_hard, "hard" },
d33e4dfe
CL		 125 { Opt_deprecated, "intr" },
126 { Opt_deprecated, "nointr" },
bf0fd768
CL		 127 { Opt_posix, "posix" },
128 { Opt_noposix, "noposix" },
129 { Opt_cto, "cto" },
130 { Opt_nocto, "nocto" },
131 { Opt_ac, "ac" },
132 { Opt_noac, "noac" },
133 { Opt_lock, "lock" },
134 { Opt_nolock, "nolock" },
135 { Opt_v2, "v2" },
136 { Opt_v3, "v3" },
764302cc 137 { Opt_v4, "v4" },
bf0fd768
CL		 138 { Opt_udp, "udp" },
139 { Opt_tcp, "tcp" },
2cf7ff7a 140 { Opt_rdma, "rdma" },
bf0fd768
CL		 141 { Opt_acl, "acl" },
142 { Opt_noacl, "noacl" },
143 { Opt_rdirplus, "rdirplus" },
144 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 145 { Opt_sharecache, "sharecache" },
146 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 147 { Opt_resvport, "resvport" },
148 { Opt_noresvport, "noresvport" },
b797cac7 149 { Opt_fscache, "fsc" },
b797cac7 150 { Opt_nofscache, "nofsc" },
bf0fd768 151
a5a16bae
CL		 152 { Opt_port, "port=%s" },
153 { Opt_rsize, "rsize=%s" },
154 { Opt_wsize, "wsize=%s" },
155 { Opt_bsize, "bsize=%s" },
156 { Opt_timeo, "timeo=%s" },
157 { Opt_retrans, "retrans=%s" },
158 { Opt_acregmin, "acregmin=%s" },
159 { Opt_acregmax, "acregmax=%s" },
160 { Opt_acdirmin, "acdirmin=%s" },
161 { Opt_acdirmax, "acdirmax=%s" },
162 { Opt_actimeo, "actimeo=%s" },
163 { Opt_namelen, "namlen=%s" },
164 { Opt_mountport, "mountport=%s" },
165 { Opt_mountvers, "mountvers=%s" },
166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 168 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 169
170 { Opt_sec, "sec=%s" },
171 { Opt_proto, "proto=%s" },
172 { Opt_mountproto, "mountproto=%s" },
173 { Opt_addr, "addr=%s" },
174 { Opt_clientaddr, "clientaddr=%s" },
33832034 175 { Opt_mounthost, "mounthost=%s" },
0ac83779 176 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 177
7973c1f1 178 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 179 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 180 { Opt_local_lock, "local_lock=%s" },
7973c1f1 181
bf0fd768
CL		 182 { Opt_err, NULL }
183};
184
185enum {
ee671b01 186 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 187
188 Opt_xprt_err
189};
190
a447c093 191static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 192 { Opt_xprt_udp, "udp" },
ee671b01 193 { Opt_xprt_udp6, "udp6" },
bf0fd768 194 { Opt_xprt_tcp, "tcp" },
ee671b01 195 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 196 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 197
198 { Opt_xprt_err, NULL }
199};
200
201enum {
202 Opt_sec_none, Opt_sec_sys,
203 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
204 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
205 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
206
207 Opt_sec_err
208};
209
a447c093 210static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 211 { Opt_sec_none, "none" },
212 { Opt_sec_none, "null" },
213 { Opt_sec_sys, "sys" },
214
215 { Opt_sec_krb5, "krb5" },
216 { Opt_sec_krb5i, "krb5i" },
217 { Opt_sec_krb5p, "krb5p" },
218
219 { Opt_sec_lkey, "lkey" },
220 { Opt_sec_lkeyi, "lkeyi" },
221 { Opt_sec_lkeyp, "lkeyp" },
222
8d042218
OK		 223 { Opt_sec_spkm, "spkm3" },
224 { Opt_sec_spkmi, "spkm3i" },
225 { Opt_sec_spkmp, "spkm3p" },
226
bf0fd768
CL		 227 { Opt_sec_err, NULL }
228};
229
7973c1f1
TM		 230enum {
231 Opt_lookupcache_all, Opt_lookupcache_positive,
232 Opt_lookupcache_none,
233
234 Opt_lookupcache_err
235};
236
237static match_table_t nfs_lookupcache_tokens = {
238 { Opt_lookupcache_all, "all" },
239 { Opt_lookupcache_positive, "pos" },
240 { Opt_lookupcache_positive, "positive" },
241 { Opt_lookupcache_none, "none" },
242
243 { Opt_lookupcache_err, NULL }
244};
245
5eebde23
SJ		 246enum {
247 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
248 Opt_local_lock_none,
249
250 Opt_local_lock_err
251};
252
253static match_table_t nfs_local_lock_tokens = {
254 { Opt_local_lock_all, "all" },
255 { Opt_local_lock_flock, "flock" },
256 { Opt_local_lock_posix, "posix" },
257 { Opt_local_lock_none, "none" },
258
259 { Opt_local_lock_err, NULL }
260};
261
bf0fd768 262
42faad99 263static void nfs_umount_begin(struct super_block *);
816724e6 264static int nfs_statfs(struct dentry *, struct kstatfs *);
f7b422b1 265static int nfs_show_options(struct seq_file *, struct vfsmount *);
c7f404b4
AV		 266static int nfs_show_devname(struct seq_file *, struct vfsmount *);
267static int nfs_show_path(struct seq_file *, struct vfsmount *);
f7b422b1 268static int nfs_show_stats(struct seq_file *, struct vfsmount *);
01194981
AV		 269static struct dentry *nfs_fs_mount(struct file_system_type *,
270 int, const char *, void *);
31f43471
AV		 271static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
272 int flags, const char *dev_name, void *raw_data);
387c149b 273static void nfs_put_super(struct super_block *);
f7b422b1 274static void nfs_kill_super(struct super_block *);
48b605f8 275static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 276
277static struct file_system_type nfs_fs_type = {
278 .owner = THIS_MODULE,
279 .name = "nfs",
01194981 280 .mount = nfs_fs_mount,
f7b422b1 281 .kill_sb = nfs_kill_super,
349457cc 282 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 283};
284
54ceac45 285struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 286 .owner = THIS_MODULE,
287 .name = "nfs",
31f43471 288 .mount = nfs_xdev_mount,
f7b422b1 289 .kill_sb = nfs_kill_super,
349457cc 290 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 291};
292
ee9b6d61 293static const struct super_operations nfs_sops = {
f7b422b1
DH		 294 .alloc_inode = nfs_alloc_inode,
295 .destroy_inode = nfs_destroy_inode,
296 .write_inode = nfs_write_inode,
387c149b 297 .put_super = nfs_put_super,
f7b422b1 298 .statfs = nfs_statfs,
b57922d9 299 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 300 .umount_begin = nfs_umount_begin,
301 .show_options = nfs_show_options,
c7f404b4
AV		 302 .show_devname = nfs_show_devname,
303 .show_path = nfs_show_path,
f7b422b1 304 .show_stats = nfs_show_stats,
48b605f8 305 .remount_fs = nfs_remount,
f7b422b1
DH		 306};
307
308#ifdef CONFIG_NFS_V4
7630c852
CL		 309static int nfs4_validate_text_mount_data(void *options,
310 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 311static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
312 struct nfs_parsed_mount_data *data);
313static struct dentry *nfs4_mount(struct file_system_type *fs_type,
314 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 315static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
316 int flags, const char *dev_name, void *raw_data);
317static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *raw_data);
01194981
AV		 319static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
320 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 321static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
322 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 323static void nfs4_kill_super(struct super_block *sb);
324
325static struct file_system_type nfs4_fs_type = {
326 .owner = THIS_MODULE,
327 .name = "nfs4",
01194981 328 .mount = nfs4_mount,
f7b422b1 329 .kill_sb = nfs4_kill_super,
349457cc 330 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 331};
332
c02d7adf
TM		 333static struct file_system_type nfs4_remote_fs_type = {
334 .owner = THIS_MODULE,
335 .name = "nfs4",
31f43471 336 .mount = nfs4_remote_mount,
c02d7adf
TM		 337 .kill_sb = nfs4_kill_super,
338 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
339};
340
54ceac45 341struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 342 .owner = THIS_MODULE,
343 .name = "nfs4",
31f43471 344 .mount = nfs4_xdev_mount,
f7b422b1 345 .kill_sb = nfs4_kill_super,
349457cc 346 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 347};
348
c02d7adf
TM		 349static struct file_system_type nfs4_remote_referral_fs_type = {
350 .owner = THIS_MODULE,
351 .name = "nfs4",
31f43471 352 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 353 .kill_sb = nfs4_kill_super,
354 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
355};
356
54ceac45 357struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 358 .owner = THIS_MODULE,
359 .name = "nfs4",
01194981 360 .mount = nfs4_referral_mount,
f7b422b1 361 .kill_sb = nfs4_kill_super,
349457cc 362 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 363};
364
ee9b6d61 365static const struct super_operations nfs4_sops = {
f7b422b1
DH		 366 .alloc_inode = nfs_alloc_inode,
367 .destroy_inode = nfs_destroy_inode,
368 .write_inode = nfs_write_inode,
387c149b 369 .put_super = nfs_put_super,
f7b422b1 370 .statfs = nfs_statfs,
b57922d9 371 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 372 .umount_begin = nfs_umount_begin,
373 .show_options = nfs_show_options,
c7f404b4
AV		 374 .show_devname = nfs_show_devname,
375 .show_path = nfs_show_path,
f7b422b1 376 .show_stats = nfs_show_stats,
48b605f8 377 .remount_fs = nfs_remount,
f7b422b1
DH		 378};
379#endif
380
8e1f936b
RR		 381static struct shrinker acl_shrinker = {
382 .shrink = nfs_access_cache_shrinker,
383 .seeks = DEFAULT_SEEKS,
384};
979df72e 385
f7b422b1
DH		 386/*
387 * Register the NFS filesystems
388 */
389int __init register_nfs_fs(void)
390{
391 int ret;
392
393 ret = register_filesystem(&nfs_fs_type);
394 if (ret < 0)
395 goto error_0;
396
f7b422b1
DH		 397 ret = nfs_register_sysctl();
398 if (ret < 0)
399 goto error_1;
89a09141 400#ifdef CONFIG_NFS_V4
f7b422b1
DH		 401 ret = register_filesystem(&nfs4_fs_type);
402 if (ret < 0)
403 goto error_2;
404#endif
8e1f936b 405 register_shrinker(&acl_shrinker);
f7b422b1
DH		 406 return 0;
407
408#ifdef CONFIG_NFS_V4
409error_2:
410 nfs_unregister_sysctl();
89a09141 411#endif
f7b422b1
DH		 412error_1:
413 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 414error_0:
415 return ret;
416}
417
418/*
419 * Unregister the NFS filesystems
420 */
421void __exit unregister_nfs_fs(void)
422{
8e1f936b 423 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 424#ifdef CONFIG_NFS_V4
425 unregister_filesystem(&nfs4_fs_type);
f7b422b1 426#endif
49af7ee1 427 nfs_unregister_sysctl();
f7b422b1
DH		 428 unregister_filesystem(&nfs_fs_type);
429}
430
1daef0a8 431void nfs_sb_active(struct super_block *sb)
ef818a28 432{
1daef0a8 433 struct nfs_server *server = NFS_SB(sb);
ef818a28 434
1daef0a8
TM		 435 if (atomic_inc_return(&server->active) == 1)
436 atomic_inc(&sb->s_active);
ef818a28
SD		 437}
438
1daef0a8 439void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 440{
441 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 442
443 if (atomic_dec_and_test(&server->active))
444 deactivate_super(sb);
ef818a28
SD		 445}
446
f7b422b1
DH		 447/*
448 * Deliver file system statistics to userspace
449 */
816724e6 450static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 451{
0c7d90cf 452 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 453 unsigned char blockbits;
454 unsigned long blockres;
0c7d90cf 455 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 456 struct nfs_fsstat res;
457 int error = -ENOMEM;
458
459 res.fattr = nfs_alloc_fattr();
460 if (res.fattr == NULL)
461 goto out_err;
f7b422b1 462
8fa5c000 463 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 464 if (unlikely(error == -ESTALE)) {
465 struct dentry *pd_dentry;
466
467 pd_dentry = dget_parent(dentry);
468 if (pd_dentry != NULL) {
469 nfs_zap_caches(pd_dentry->d_inode);
470 dput(pd_dentry);
471 }
472 }
ca7e9a0d 473 nfs_free_fattr(res.fattr);
f7b422b1
DH		 474 if (error < 0)
475 goto out_err;
ca7e9a0d 476
1a0ba9ae 477 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 478
479 /*
480 * Current versions of glibc do not correctly handle the
481 * case where f_frsize != f_bsize. Eventually we want to
482 * report the value of wtmult in this field.
483 */
0c7d90cf 484 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 485
486 /*
487 * On most *nix systems, f_blocks, f_bfree, and f_bavail
488 * are reported in units of f_frsize. Linux hasn't had
489 * an f_frsize field in its statfs struct until recently,
490 * thus historically Linux's sys_statfs reports these
491 * fields in units of f_bsize.
492 */
0c7d90cf
DH		 493 buf->f_bsize = dentry->d_sb->s_blocksize;
494 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 495 blockres = (1 << blockbits) - 1;
496 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
497 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
498 buf->f_bavail = (res.abytes + blockres) >> blockbits;
499
500 buf->f_files = res.tfiles;
501 buf->f_ffree = res.afiles;
502
503 buf->f_namelen = server->namelen;
1a0ba9ae 504
f7b422b1
DH		 505 return 0;
506
507 out_err:
3110ff80 508 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 509 return error;
f7b422b1
DH		 510}
511
7d4e2747
DH		 512/*
513 * Map the security flavour number to a name
514 */
81039f1f
TM		 515static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
516{
7d4e2747 517 static const struct {
81039f1f
TM		 518 rpc_authflavor_t flavour;
519 const char *str;
520 } sec_flavours[] = {
521 { RPC_AUTH_NULL, "null" },
522 { RPC_AUTH_UNIX, "sys" },
523 { RPC_AUTH_GSS_KRB5, "krb5" },
524 { RPC_AUTH_GSS_KRB5I, "krb5i" },
525 { RPC_AUTH_GSS_KRB5P, "krb5p" },
526 { RPC_AUTH_GSS_LKEY, "lkey" },
527 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
528 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
529 { RPC_AUTH_GSS_SPKM, "spkm" },
530 { RPC_AUTH_GSS_SPKMI, "spkmi" },
531 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 532 { UINT_MAX, "unknown" }
81039f1f
TM		 533 };
534 int i;
535
4d81cd16 536 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 537 if (sec_flavours[i].flavour == flavour)
538 break;
539 }
540 return sec_flavours[i].str;
541}
542
ee671b01
JL		 543static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
544 int showdefaults)
545{
546 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
547
548 seq_printf(m, ",mountproto=");
549 switch (sap->sa_family) {
550 case AF_INET:
551 switch (nfss->mountd_protocol) {
552 case IPPROTO_UDP:
553 seq_printf(m, RPCBIND_NETID_UDP);
554 break;
555 case IPPROTO_TCP:
556 seq_printf(m, RPCBIND_NETID_TCP);
557 break;
558 default:
559 if (showdefaults)
560 seq_printf(m, "auto");
561 }
562 break;
563 case AF_INET6:
564 switch (nfss->mountd_protocol) {
565 case IPPROTO_UDP:
566 seq_printf(m, RPCBIND_NETID_UDP6);
567 break;
568 case IPPROTO_TCP:
569 seq_printf(m, RPCBIND_NETID_TCP6);
570 break;
571 default:
572 if (showdefaults)
573 seq_printf(m, "auto");
574 }
575 break;
576 default:
577 if (showdefaults)
578 seq_printf(m, "auto");
579 }
580}
581
82d101d5
CL		 582static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
583 int showdefaults)
584{
585 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
586
d5eff1a3
BS		 587 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
588 return;
589
82d101d5
CL		 590 switch (sap->sa_family) {
591 case AF_INET: {
592 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 593 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 594 break;
595 }
596 case AF_INET6: {
597 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 598 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 599 break;
600 }
601 default:
602 if (showdefaults)
603 seq_printf(m, ",mountaddr=unspecified");
604 }
605
606 if (nfss->mountd_version || showdefaults)
607 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 608 if ((nfss->mountd_port &&
609 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
610 showdefaults)
82d101d5
CL		 611 seq_printf(m, ",mountport=%u", nfss->mountd_port);
612
ee671b01 613 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 614}
615
0be8189f
TM		 616#ifdef CONFIG_NFS_V4
617static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
618 int showdefaults)
619{
620 struct nfs_client *clp = nfss->nfs_client;
621
622 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
623 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
624}
625#else
626static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
627 int showdefaults)
628{
629}
630#endif
631
f7b422b1
DH		 632/*
633 * Describe the mount options in force on this server representation
634 */
82d101d5
CL		 635static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
636 int showdefaults)
f7b422b1 637{
509de811 638 static const struct proc_nfs_info {
f7b422b1 639 int flag;
509de811
DH		 640 const char *str;
641 const char *nostr;
f7b422b1
DH		 642 } nfs_info[] = {
643 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 644 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 645 { NFS_MOUNT_NOCTO, ",nocto", "" },
646 { NFS_MOUNT_NOAC, ",noac", "" },
647 { NFS_MOUNT_NONLM, ",nolock", "" },
648 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 649 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 650 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
651 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 652 { 0, NULL, NULL }
653 };
509de811 654 const struct proc_nfs_info *nfs_infop;
8fa5c000 655 struct nfs_client *clp = nfss->nfs_client;
82d101d5 656 u32 version = clp->rpc_ops->version;
7c563cc9 657 int local_flock, local_fcntl;
f7b422b1 658
82d101d5 659 seq_printf(m, ",vers=%u", version);
2d767432
CL		 660 seq_printf(m, ",rsize=%u", nfss->rsize);
661 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 662 if (nfss->bsize != 0)
663 seq_printf(m, ",bsize=%u", nfss->bsize);
664 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 665 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 666 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 667 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 668 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 669 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 670 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 671 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 672 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 673 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
674 if (nfss->flags & nfs_infop->flag)
675 seq_puts(m, nfs_infop->str);
676 else
677 seq_puts(m, nfs_infop->nostr);
678 }
56928edd 679 seq_printf(m, ",proto=%s",
ee671b01 680 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 681 if (version == 4) {
682 if (nfss->port != NFS_PORT)
683 seq_printf(m, ",port=%u", nfss->port);
684 } else
685 if (nfss->port)
686 seq_printf(m, ",port=%u", nfss->port);
687
33170233
TM		 688 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
689 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 690 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 691
692 if (version != 4)
693 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 694 else
695 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 696
b797cac7
DH		 697 if (nfss->options & NFS_OPTION_FSCACHE)
698 seq_printf(m, ",fsc");
9b00c643
PL		 699
700 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
702 seq_printf(m, ",lookupcache=none");
703 else
704 seq_printf(m, ",lookupcache=pos");
705 }
7c563cc9
SJ		 706
707 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
708 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
709
710 if (!local_flock && !local_fcntl)
711 seq_printf(m, ",local_lock=none");
712 else if (local_flock && local_fcntl)
713 seq_printf(m, ",local_lock=all");
714 else if (local_flock)
715 seq_printf(m, ",local_lock=flock");
716 else
717 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 718}
719
720/*
721 * Describe the mount options on this VFS mountpoint
722 */
723static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
724{
725 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
726
727 nfs_show_mount_options(m, nfss, 0);
728
5d8515ca
CL		 729 seq_printf(m, ",addr=%s",
730 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
731 RPC_DISPLAY_ADDR));
f7b422b1
DH		 732
733 return 0;
734}
735
c7f404b4
AV		 736static int nfs_show_devname(struct seq_file *m, struct vfsmount *mnt)
737{
738 char *page = (char *) __get_free_page(GFP_KERNEL);
739 char *devname, *dummy;
740 int err = 0;
741 if (!page)
742 return -ENOMEM;
743 devname = nfs_path(&dummy, mnt->mnt_root, page, PAGE_SIZE);
744 if (IS_ERR(devname))
745 err = PTR_ERR(devname);
746 else
747 seq_escape(m, devname, " \t\n\\");
748 free_page((unsigned long)page);
749 return err;
750}
751
752static int nfs_show_path(struct seq_file *m, struct vfsmount *mnt)
753{
754 seq_puts(m, "/");
755 return 0;
756}
757
f7b422b1
DH		 758/*
759 * Present statistical information for this VFS mountpoint
760 */
761static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
762{
763 int i, cpu;
764 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
765 struct rpc_auth *auth = nfss->client->cl_auth;
766 struct nfs_iostats totals = { };
767
768 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
769
770 /*
771 * Display all mount option settings
772 */
773 seq_printf(m, "\n\topts:\t");
774 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
775 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
776 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
777 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
778 nfs_show_mount_options(m, nfss, 1);
779
780 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
781
782 seq_printf(m, "\n\tcaps:\t");
783 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 784 seq_printf(m, ",wtmult=%u", nfss->wtmult);
785 seq_printf(m, ",dtsize=%u", nfss->dtsize);
786 seq_printf(m, ",bsize=%u", nfss->bsize);
787 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 788
789#ifdef CONFIG_NFS_V4
40c55319 790 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 791 seq_printf(m, "\n\tnfsv4:\t");
792 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
793 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
794 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
795 }
796#endif
797
798 /*
799 * Display security flavor in effect for this mount
800 */
2d767432 801 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 802 if (auth->au_flavor)
2d767432 803 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 804
805 /*
806 * Display superblock I/O counters
807 */
808 for_each_possible_cpu(cpu) {
809 struct nfs_iostats *stats;
810
811 preempt_disable();
812 stats = per_cpu_ptr(nfss->io_stats, cpu);
813
814 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
815 totals.events[i] += stats->events[i];
816 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
817 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 818#ifdef CONFIG_NFS_FSCACHE
819 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
820 totals.fscache[i] += stats->fscache[i];
821#endif
f7b422b1
DH		 822
823 preempt_enable();
824 }
825
826 seq_printf(m, "\n\tevents:\t");
827 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
828 seq_printf(m, "%lu ", totals.events[i]);
829 seq_printf(m, "\n\tbytes:\t");
830 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
831 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 832#ifdef CONFIG_NFS_FSCACHE
833 if (nfss->options & NFS_OPTION_FSCACHE) {
834 seq_printf(m, "\n\tfsc:\t");
835 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
836 seq_printf(m, "%Lu ", totals.bytes[i]);
837 }
838#endif
f7b422b1
DH		 839 seq_printf(m, "\n");
840
841 rpc_print_iostats(m, nfss->client);
842
843 return 0;
844}
845
846/*
847 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 848 * in response to xdev traversals and referrals
f7b422b1 849 */
42faad99 850static void nfs_umount_begin(struct super_block *sb)
f7b422b1 851{
67e55205 852 struct nfs_server *server;
fc6ae3cf
TM		 853 struct rpc_clnt *rpc;
854
67e55205 855 server = NFS_SB(sb);
fc6ae3cf
TM		 856 /* -EIO all pending I/O */
857 rpc = server->client_acl;
858 if (!IS_ERR(rpc))
859 rpc_killall_tasks(rpc);
860 rpc = server->client;
861 if (!IS_ERR(rpc))
862 rpc_killall_tasks(rpc);
f7b422b1
DH		 863}
864
c5811dbd 865static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 866{
867 struct nfs_parsed_mount_data *data;
868
869 data = kzalloc(sizeof(*data), GFP_KERNEL);
870 if (data) {
9423a08a
CL		 871 data->acregmin = NFS_DEF_ACREGMIN;
872 data->acregmax = NFS_DEF_ACREGMAX;
873 data->acdirmin = NFS_DEF_ACDIRMIN;
874 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 875 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 876 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 877 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 878 data->auth_flavors[0] = RPC_AUTH_UNIX;
879 data->auth_flavor_len = 1;
c5811dbd 880 data->version = version;
9423a08a
CL		 881 data->minorversion = 0;
882 }
883 return data;
884}
885
fc50d58f 886/*
cdcd7f9a
CL		 887 * Sanity-check a server address provided by the mount command.
888 *
889 * Address family must be initialized, and address must not be
890 * the ANY address for that family.
fc50d58f
CL		 891 */
892static int nfs_verify_server_address(struct sockaddr *addr)
893{
894 switch (addr->sa_family) {
895 case AF_INET: {
cdcd7f9a 896 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 897 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 898 }
899 case AF_INET6: {
900 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
901 return !ipv6_addr_any(sa);
fc50d58f
CL		 902 }
903 }
904
53a0b9c4 905 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 906 return 0;
907}
908
4cfd74fc
CL		 909/*
910 * Select between a default port value and a user-specified port value.
911 * If a zero value is set, then autobind will be used.
912 */
f5855fec 913static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 914 const unsigned short default_port)
915{
f5855fec
TM		 916 if (*port == NFS_UNSPEC_PORT)
917 *port = default_port;
4cfd74fc 918
f5855fec 919 rpc_set_port(sap, *port);
4cfd74fc
CL		 920}
921
259875ef
TM		 922/*
923 * Sanity check the NFS transport protocol.
924 *
925 */
926static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
927{
928 switch (mnt->nfs_server.protocol) {
929 case XPRT_TRANSPORT_UDP:
930 case XPRT_TRANSPORT_TCP:
931 case XPRT_TRANSPORT_RDMA:
932 break;
933 default:
934 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
935 }
936}
937
938/*
939 * For text based NFSv2/v3 mounts, the mount protocol transport default
940 * settings should depend upon the specified NFS transport.
941 */
942static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
943{
944 nfs_validate_transport_protocol(mnt);
945
946 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
947 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
948 return;
949 switch (mnt->nfs_server.protocol) {
950 case XPRT_TRANSPORT_UDP:
951 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
952 break;
953 case XPRT_TRANSPORT_TCP:
954 case XPRT_TRANSPORT_RDMA:
955 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
956 }
957}
958
01060c89
CL		 959/*
960 * Parse the value of the 'sec=' option.
01060c89
CL		 961 */
962static int nfs_parse_security_flavors(char *value,
963 struct nfs_parsed_mount_data *mnt)
964{
965 substring_t args[MAX_OPT_ARGS];
966
967 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
968
969 switch (match_token(value, nfs_secflavor_tokens, args)) {
970 case Opt_sec_none:
01060c89
CL		 971 mnt->auth_flavors[0] = RPC_AUTH_NULL;
972 break;
973 case Opt_sec_sys:
01060c89
CL		 974 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
975 break;
976 case Opt_sec_krb5:
01060c89
CL		 977 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
978 break;
979 case Opt_sec_krb5i:
01060c89
CL		 980 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
981 break;
982 case Opt_sec_krb5p:
01060c89
CL		 983 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
984 break;
985 case Opt_sec_lkey:
01060c89
CL		 986 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
987 break;
988 case Opt_sec_lkeyi:
01060c89
CL		 989 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
990 break;
991 case Opt_sec_lkeyp:
01060c89
CL		 992 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
993 break;
994 case Opt_sec_spkm:
01060c89
CL		 995 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
996 break;
997 case Opt_sec_spkmi:
01060c89
CL		 998 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
999 break;
1000 case Opt_sec_spkmp:
01060c89
CL		 1001 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1002 break;
1003 default:
1004 return 0;
1005 }
1006
9b7160c5 1007 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1008 mnt->auth_flavor_len = 1;
01060c89
CL		 1009 return 1;
1010}
1011
c5cb09b6
RL		 1012static int nfs_get_option_str(substring_t args[], char **option)
1013{
1014 kfree(*option);
1015 *option = match_strdup(args);
1016 return !option;
1017}
1018
1019static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1020{
1021 int rc;
1022 char *string;
1023
1024 string = match_strdup(args);
1025 if (string == NULL)
1026 return -ENOMEM;
1027 rc = strict_strtoul(string, 10, option);
1028 kfree(string);
1029
1030 return rc;
1031}
1032
bf0fd768
CL		 1033/*
1034 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1035 * a data structure. The whole mount string is processed; bad options are
1036 * skipped as they are encountered. If there were no errors, return 1;
1037 * otherwise return 0 (zero).
bf0fd768
CL		 1038 */
1039static int nfs_parse_mount_options(char *raw,
1040 struct nfs_parsed_mount_data *mnt)
1041{
f9c3a380 1042 char *p, *string, *secdata;
d23c45fd 1043 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1044 unsigned short protofamily = AF_UNSPEC;
1045 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1046
1047 if (!raw) {
1048 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1049 return 1;
1050 }
1051 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1052
f9c3a380
EP		 1053 secdata = alloc_secdata();
1054 if (!secdata)
1055 goto out_nomem;
1056
1057 rc = security_sb_copy_data(raw, secdata);
1058 if (rc)
1059 goto out_security_failure;
1060
1061 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1062 if (rc)
1063 goto out_security_failure;
1064
1065 free_secdata(secdata);
1066
bf0fd768
CL		 1067 while ((p = strsep(&raw, ",")) != NULL) {
1068 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1069 unsigned long option;
1070 int token;
bf0fd768
CL		 1071
1072 if (!*p)
1073 continue;
1074
1075 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1076
1077 token = match_token(p, nfs_mount_option_tokens, args);
1078 switch (token) {
f45663ce
CL		 1079
1080 /*
1081 * boolean options: foo/nofoo
1082 */
bf0fd768
CL		 1083 case Opt_soft:
1084 mnt->flags |= NFS_MOUNT_SOFT;
1085 break;
1086 case Opt_hard:
1087 mnt->flags &= ~NFS_MOUNT_SOFT;
1088 break;
bf0fd768
CL		 1089 case Opt_posix:
1090 mnt->flags |= NFS_MOUNT_POSIX;
1091 break;
1092 case Opt_noposix:
1093 mnt->flags &= ~NFS_MOUNT_POSIX;
1094 break;
1095 case Opt_cto:
1096 mnt->flags &= ~NFS_MOUNT_NOCTO;
1097 break;
1098 case Opt_nocto:
1099 mnt->flags |= NFS_MOUNT_NOCTO;
1100 break;
1101 case Opt_ac:
1102 mnt->flags &= ~NFS_MOUNT_NOAC;
1103 break;
1104 case Opt_noac:
1105 mnt->flags |= NFS_MOUNT_NOAC;
1106 break;
1107 case Opt_lock:
1108 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1109 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1110 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1111 break;
1112 case Opt_nolock:
1113 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1114 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1115 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1116 break;
1117 case Opt_v2:
1118 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1119 mnt->version = 2;
bf0fd768
CL		 1120 break;
1121 case Opt_v3:
1122 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1123 mnt->version = 3;
bf0fd768 1124 break;
764302cc
CL		 1125 case Opt_v4:
1126 mnt->flags &= ~NFS_MOUNT_VER3;
1127 mnt->version = 4;
1128 break;
bf0fd768
CL		 1129 case Opt_udp:
1130 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1131 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1132 break;
1133 case Opt_tcp:
1134 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1135 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1136 break;
2cf7ff7a
TT		 1137 case Opt_rdma:
1138 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1139 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1140 xprt_load_transport(p);
2cf7ff7a 1141 break;
bf0fd768
CL		 1142 case Opt_acl:
1143 mnt->flags &= ~NFS_MOUNT_NOACL;
1144 break;
1145 case Opt_noacl:
1146 mnt->flags |= NFS_MOUNT_NOACL;
1147 break;
1148 case Opt_rdirplus:
1149 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1150 break;
1151 case Opt_nordirplus:
1152 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1153 break;
75180df2
TM		 1154 case Opt_sharecache:
1155 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1156 break;
1157 case Opt_nosharecache:
1158 mnt->flags |= NFS_MOUNT_UNSHARED;
1159 break;
d740351b
CL		 1160 case Opt_resvport:
1161 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1162 break;
1163 case Opt_noresvport:
1164 mnt->flags |= NFS_MOUNT_NORESVPORT;
1165 break;
b797cac7
DH		 1166 case Opt_fscache:
1167 mnt->options |= NFS_OPTION_FSCACHE;
1168 kfree(mnt->fscache_uniq);
1169 mnt->fscache_uniq = NULL;
1170 break;
1171 case Opt_nofscache:
1172 mnt->options &= ~NFS_OPTION_FSCACHE;
1173 kfree(mnt->fscache_uniq);
1174 mnt->fscache_uniq = NULL;
1175 break;
bf0fd768 1176
f45663ce
CL		 1177 /*
1178 * options that take numeric values
1179 */
bf0fd768 1180 case Opt_port:
c5cb09b6
RL		 1181 if (nfs_get_option_ul(args, &option) ||
1182 option > USHRT_MAX)
d23c45fd
CL		 1183 goto out_invalid_value;
1184 mnt->nfs_server.port = option;
bf0fd768
CL		 1185 break;
1186 case Opt_rsize:
c5cb09b6 1187 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1188 goto out_invalid_value;
1189 mnt->rsize = option;
bf0fd768
CL		 1190 break;
1191 case Opt_wsize:
c5cb09b6 1192 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1193 goto out_invalid_value;
1194 mnt->wsize = option;
bf0fd768
CL		 1195 break;
1196 case Opt_bsize:
c5cb09b6 1197 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1198 goto out_invalid_value;
1199 mnt->bsize = option;
bf0fd768
CL		 1200 break;
1201 case Opt_timeo:
c5cb09b6 1202 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1203 goto out_invalid_value;
1204 mnt->timeo = option;
bf0fd768
CL		 1205 break;
1206 case Opt_retrans:
c5cb09b6 1207 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1208 goto out_invalid_value;
1209 mnt->retrans = option;
bf0fd768
CL		 1210 break;
1211 case Opt_acregmin:
c5cb09b6 1212 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1213 goto out_invalid_value;
1214 mnt->acregmin = option;
bf0fd768
CL		 1215 break;
1216 case Opt_acregmax:
c5cb09b6 1217 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1218 goto out_invalid_value;
1219 mnt->acregmax = option;
bf0fd768
CL		 1220 break;
1221 case Opt_acdirmin:
c5cb09b6 1222 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1223 goto out_invalid_value;
1224 mnt->acdirmin = option;
bf0fd768
CL		 1225 break;
1226 case Opt_acdirmax:
c5cb09b6 1227 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1228 goto out_invalid_value;
1229 mnt->acdirmax = option;
bf0fd768
CL		 1230 break;
1231 case Opt_actimeo:
c5cb09b6 1232 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1233 goto out_invalid_value;
1234 mnt->acregmin = mnt->acregmax =
1235 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1236 break;
1237 case Opt_namelen:
c5cb09b6 1238 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1239 goto out_invalid_value;
1240 mnt->namlen = option;
bf0fd768
CL		 1241 break;
1242 case Opt_mountport:
c5cb09b6
RL		 1243 if (nfs_get_option_ul(args, &option) ||
1244 option > USHRT_MAX)
d23c45fd
CL		 1245 goto out_invalid_value;
1246 mnt->mount_server.port = option;
bf0fd768 1247 break;
bf0fd768 1248 case Opt_mountvers:
c5cb09b6 1249 if (nfs_get_option_ul(args, &option) ||
f45663ce 1250 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1251 option > NFS_MNT3_VERSION)
1252 goto out_invalid_value;
1253 mnt->mount_server.version = option;
bf0fd768 1254 break;
bf0fd768 1255 case Opt_nfsvers:
c5cb09b6 1256 if (nfs_get_option_ul(args, &option))
d23c45fd 1257 goto out_invalid_value;
bf0fd768 1258 switch (option) {
f45663ce 1259 case NFS2_VERSION:
bf0fd768 1260 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1261 mnt->version = 2;
bf0fd768 1262 break;
f45663ce 1263 case NFS3_VERSION:
bf0fd768 1264 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1265 mnt->version = 3;
1266 break;
764302cc
CL		 1267 case NFS4_VERSION:
1268 mnt->flags &= ~NFS_MOUNT_VER3;
1269 mnt->version = 4;
bf0fd768
CL		 1270 break;
1271 default:
d23c45fd 1272 goto out_invalid_value;
bf0fd768
CL		 1273 }
1274 break;
3fd5be9e 1275 case Opt_minorversion:
c5cb09b6 1276 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1277 goto out_invalid_value;
1278 if (option > NFS4_MAX_MINOR_VERSION)
1279 goto out_invalid_value;
1280 mnt->minorversion = option;
3fd5be9e 1281 break;
bf0fd768 1282
f45663ce
CL		 1283 /*
1284 * options that take text values
1285 */
bf0fd768
CL		 1286 case Opt_sec:
1287 string = match_strdup(args);
1288 if (string == NULL)
1289 goto out_nomem;
01060c89 1290 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1291 kfree(string);
f45663ce 1292 if (!rc) {
f45663ce
CL		 1293 dfprintk(MOUNT, "NFS: unrecognized "
1294 "security flavor\n");
d23c45fd 1295 return 0;
f45663ce 1296 }
bf0fd768
CL		 1297 break;
1298 case Opt_proto:
1299 string = match_strdup(args);
1300 if (string == NULL)
1301 goto out_nomem;
1302 token = match_token(string,
1303 nfs_xprt_protocol_tokens, args);
bf0fd768 1304
ee671b01 1305 protofamily = AF_INET;
bf0fd768 1306 switch (token) {
ee671b01
JL		 1307 case Opt_xprt_udp6:
1308 protofamily = AF_INET6;
fdb66ff4 1309 case Opt_xprt_udp:
bf0fd768 1310 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1311 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1312 break;
ee671b01
JL		 1313 case Opt_xprt_tcp6:
1314 protofamily = AF_INET6;
fdb66ff4 1315 case Opt_xprt_tcp:
bf0fd768 1316 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1317 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1318 break;
2cf7ff7a
TT		 1319 case Opt_xprt_rdma:
1320 /* vector side protocols to TCP */
1321 mnt->flags |= NFS_MOUNT_TCP;
1322 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1323 xprt_load_transport(string);
2cf7ff7a 1324 break;
bf0fd768 1325 default:
f45663ce
CL		 1326 dfprintk(MOUNT, "NFS: unrecognized "
1327 "transport protocol\n");
4223a4a1 1328 kfree(string);
d23c45fd 1329 return 0;
bf0fd768 1330 }
c5cb09b6 1331 kfree(string);
bf0fd768
CL		 1332 break;
1333 case Opt_mountproto:
1334 string = match_strdup(args);
1335 if (string == NULL)
1336 goto out_nomem;
1337 token = match_token(string,
1338 nfs_xprt_protocol_tokens, args);
d508afb4 1339 kfree(string);
bf0fd768 1340
ee671b01 1341 mountfamily = AF_INET;
bf0fd768 1342 switch (token) {
ee671b01
JL		 1343 case Opt_xprt_udp6:
1344 mountfamily = AF_INET6;
fdb66ff4 1345 case Opt_xprt_udp:
0896a725 1346 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1347 break;
ee671b01
JL		 1348 case Opt_xprt_tcp6:
1349 mountfamily = AF_INET6;
fdb66ff4 1350 case Opt_xprt_tcp:
0896a725 1351 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1352 break;
2cf7ff7a 1353 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1354 default:
f45663ce
CL		 1355 dfprintk(MOUNT, "NFS: unrecognized "
1356 "transport protocol\n");
d23c45fd 1357 return 0;
bf0fd768
CL		 1358 }
1359 break;
1360 case Opt_addr:
1361 string = match_strdup(args);
1362 if (string == NULL)
1363 goto out_nomem;
53a0b9c4
CL		 1364 mnt->nfs_server.addrlen =
1365 rpc_pton(string, strlen(string),
1366 (struct sockaddr *)
1367 &mnt->nfs_server.address,
1368 sizeof(mnt->nfs_server.address));
bf0fd768 1369 kfree(string);
53a0b9c4
CL		 1370 if (mnt->nfs_server.addrlen == 0)
1371 goto out_invalid_address;
bf0fd768
CL		 1372 break;
1373 case Opt_clientaddr:
c5cb09b6 1374 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1375 goto out_nomem;
bf0fd768 1376 break;
33832034 1377 case Opt_mounthost:
c5cb09b6
RL		 1378 if (nfs_get_option_str(args,
1379 &mnt->mount_server.hostname))
33832034 1380 goto out_nomem;
33832034 1381 break;
0ac83779 1382 case Opt_mountaddr:
bf0fd768
CL		 1383 string = match_strdup(args);
1384 if (string == NULL)
1385 goto out_nomem;
53a0b9c4
CL		 1386 mnt->mount_server.addrlen =
1387 rpc_pton(string, strlen(string),
1388 (struct sockaddr *)
1389 &mnt->mount_server.address,
1390 sizeof(mnt->mount_server.address));
bf0fd768 1391 kfree(string);
53a0b9c4
CL		 1392 if (mnt->mount_server.addrlen == 0)
1393 goto out_invalid_address;
bf0fd768 1394 break;
7973c1f1
TM		 1395 case Opt_lookupcache:
1396 string = match_strdup(args);
1397 if (string == NULL)
1398 goto out_nomem;
1399 token = match_token(string,
1400 nfs_lookupcache_tokens, args);
1401 kfree(string);
1402 switch (token) {
1403 case Opt_lookupcache_all:
1404 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1405 break;
1406 case Opt_lookupcache_positive:
1407 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1408 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1409 break;
1410 case Opt_lookupcache_none:
1411 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1412 break;
1413 default:
7973c1f1
TM		 1414 dfprintk(MOUNT, "NFS: invalid "
1415 "lookupcache argument\n");
d23c45fd 1416 return 0;
7973c1f1
TM		 1417 };
1418 break;
a6d5ff64 1419 case Opt_fscache_uniq:
c5cb09b6 1420 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1421 goto out_nomem;
a6d5ff64
CL		 1422 mnt->options |= NFS_OPTION_FSCACHE;
1423 break;
5eebde23
SJ		 1424 case Opt_local_lock:
1425 string = match_strdup(args);
1426 if (string == NULL)
1427 goto out_nomem;
1428 token = match_token(string, nfs_local_lock_tokens,
1429 args);
1430 kfree(string);
1431 switch (token) {
1432 case Opt_local_lock_all:
1433 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1434 NFS_MOUNT_LOCAL_FCNTL);
1435 break;
1436 case Opt_local_lock_flock:
1437 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1438 break;
1439 case Opt_local_lock_posix:
1440 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1441 break;
1442 case Opt_local_lock_none:
1443 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1444 NFS_MOUNT_LOCAL_FCNTL);
1445 break;
1446 default:
1447 dfprintk(MOUNT, "NFS: invalid "
1448 "local_lock argument\n");
1449 return 0;
1450 };
1451 break;
bf0fd768 1452
f45663ce
CL		 1453 /*
1454 * Special options
1455 */
1456 case Opt_sloppy:
1457 sloppy = 1;
1458 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1459 break;
bf0fd768
CL		 1460 case Opt_userspace:
1461 case Opt_deprecated:
d33e4dfe
CL		 1462 dfprintk(MOUNT, "NFS: ignoring mount option "
1463 "'%s'\n", p);
bf0fd768
CL		 1464 break;
1465
1466 default:
d23c45fd 1467 invalid_option = 1;
f45663ce
CL		 1468 dfprintk(MOUNT, "NFS: unrecognized mount option "
1469 "'%s'\n", p);
bf0fd768
CL		 1470 }
1471 }
1472
d23c45fd
CL		 1473 if (!sloppy && invalid_option)
1474 return 0;
1475
ee671b01
JL		 1476 /*
1477 * verify that any proto=/mountproto= options match the address
1478 * familiies in the addr=/mountaddr= options.
1479 */
1480 if (protofamily != AF_UNSPEC &&
1481 protofamily != mnt->nfs_server.address.ss_family)
1482 goto out_proto_mismatch;
1483
1484 if (mountfamily != AF_UNSPEC) {
1485 if (mnt->mount_server.addrlen) {
1486 if (mountfamily != mnt->mount_server.address.ss_family)
1487 goto out_mountproto_mismatch;
1488 } else {
1489 if (mountfamily != mnt->nfs_server.address.ss_family)
1490 goto out_mountproto_mismatch;
1491 }
1492 }
1493
bf0fd768
CL		 1494 return 1;
1495
ee671b01
JL		 1496out_mountproto_mismatch:
1497 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1498 "option\n");
1499 return 0;
1500out_proto_mismatch:
1501 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1502 return 0;
53a0b9c4
CL		 1503out_invalid_address:
1504 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1505 return 0;
d23c45fd 1506out_invalid_value:
53a0b9c4 1507 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1508 return 0;
bf0fd768
CL		 1509out_nomem:
1510 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1511 return 0;
f9c3a380
EP		 1512out_security_failure:
1513 free_secdata(secdata);
1514 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1515 return 0;
bf0fd768
CL		 1516}
1517
ec88f28d
CL		 1518/*
1519 * Match the requested auth flavors with the list returned by
1520 * the server. Returns zero and sets the mount's authentication
1521 * flavor on success; returns -EACCES if server does not support
1522 * the requested flavor.
1523 */
1524static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1525 struct nfs_mount_request *request)
1526{
1527 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1528
5eecfde6
CL		 1529 /*
1530 * Certain releases of Linux's mountd return an empty
1531 * flavor list. To prevent behavioral regression with
1532 * these servers (ie. rejecting mounts that used to
1533 * succeed), revert to pre-2.6.32 behavior (no checking)
1534 * if the returned flavor list is empty.
1535 */
1536 if (server_authlist_len == 0)
1537 return 0;
1538
ec88f28d
CL		 1539 /*
1540 * We avoid sophisticated negotiating here, as there are
1541 * plenty of cases where we can get it wrong, providing
1542 * either too little or too much security.
1543 *
1544 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1545 * flavor listed first. However, some servers list
1546 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1547 * preferred default, in args->auth_flavors[0] if user
1548 * didn't specify sec= mount option.
1549 */
1550 for (i = 0; i < args->auth_flavor_len; i++)
1551 for (j = 0; j < server_authlist_len; j++)
1552 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1553 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1554 request->auth_flavs[j]);
1555 args->auth_flavors[0] = request->auth_flavs[j];
1556 return 0;
1557 }
1558
1559 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1560 nfs_umount(request);
1561 return -EACCES;
1562}
1563
0076d7b7
CL		 1564/*
1565 * Use the remote server's MOUNT service to request the NFS file handle
1566 * corresponding to the provided path.
1567 */
1568static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1569 struct nfs_fh *root_fh)
1570{
ec88f28d
CL		 1571 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1572 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1573 struct nfs_mount_request request = {
1574 .sap = (struct sockaddr *)
1575 &args->mount_server.address,
1576 .dirpath = args->nfs_server.export_path,
1577 .protocol = args->mount_server.protocol,
1578 .fh = root_fh,
50a737f8 1579 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1580 .auth_flav_len = &server_authlist_len,
1581 .auth_flavs = server_authlist,
c5d120f8 1582 };
4c568017 1583 int status;
0076d7b7
CL		 1584
1585 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1586 switch (args->version) {
1587 default:
1588 args->mount_server.version = NFS_MNT3_VERSION;
1589 break;
1590 case 2:
1591 args->mount_server.version = NFS_MNT_VERSION;
1592 }
0076d7b7 1593 }
c5d120f8 1594 request.version = args->mount_server.version;
0076d7b7 1595
33832034 1596 if (args->mount_server.hostname)
c5d120f8 1597 request.hostname = args->mount_server.hostname;
33832034 1598 else
c5d120f8 1599 request.hostname = args->nfs_server.hostname;
33832034 1600
0076d7b7
CL		 1601 /*
1602 * Construct the mount server's address.
1603 */
4c568017 1604 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1605 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1606 args->nfs_server.addrlen);
1607 args->mount_server.addrlen = args->nfs_server.addrlen;
1608 }
c5d120f8 1609 request.salen = args->mount_server.addrlen;
f5855fec 1610 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1611
1612 /*
1613 * Now ask the mount server to map our export path
1614 * to a file handle.
1615 */
c5d120f8 1616 status = nfs_mount(&request);
ec88f28d
CL		 1617 if (status != 0) {
1618 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1619 request.hostname, status);
1620 return status;
1621 }
0076d7b7 1622
ec88f28d
CL		 1623 /*
1624 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1625 */
1626 if (args->mount_server.version != NFS_MNT3_VERSION)
1627 return 0;
1628 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1629}
1630
c12bacec
RL		 1631/*
1632 * Split "dev_name" into "hostname:export_path".
1633 *
1634 * The leftmost colon demarks the split between the server's hostname
1635 * and the export path. If the hostname starts with a left square
1636 * bracket, then it may contain colons.
1637 *
1638 * Note: caller frees hostname and export path, even on error.
1639 */
1640static int nfs_parse_devname(const char *dev_name,
1641 char **hostname, size_t maxnamlen,
1642 char **export_path, size_t maxpathlen)
dc045898
CL		 1643{
1644 size_t len;
c12bacec 1645 char *end;
dc045898 1646
c12bacec
RL		 1647 /* Is the host name protected with square brakcets? */
1648 if (*dev_name == '[') {
1649 end = strchr(++dev_name, ']');
1650 if (end == NULL || end[1] != ':')
dc045898 1651 goto out_bad_devname;
dc045898 1652
c12bacec
RL		 1653 len = end - dev_name;
1654 end++;
1655 } else {
1656 char *comma;
dc045898 1657
c12bacec
RL		 1658 end = strchr(dev_name, ':');
1659 if (end == NULL)
1660 goto out_bad_devname;
1661 len = end - dev_name;
d1aa0825 1662
c12bacec
RL		 1663 /* kill possible hostname list: not supported */
1664 comma = strchr(dev_name, ',');
1665 if (comma != NULL && comma < end)
1666 *comma = 0;
1667 }
d1aa0825 1668
d1aa0825
CL		 1669 if (len > maxnamlen)
1670 goto out_hostname;
1671
1672 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1673 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1674 if (*hostname == NULL)
1675 goto out_nomem;
c12bacec 1676 len = strlen(++end);
d1aa0825
CL		 1677 if (len > maxpathlen)
1678 goto out_path;
1679 *export_path = kstrndup(end, len, GFP_KERNEL);
1680 if (!*export_path)
1681 goto out_nomem;
1682
c12bacec 1683 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1684 return 0;
1685
1686out_bad_devname:
1687 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1688 return -EINVAL;
1689
1690out_nomem:
1691 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1692 return -ENOMEM;
1693
1694out_hostname:
1695 dfprintk(MOUNT, "NFS: server hostname too long\n");
1696 return -ENAMETOOLONG;
1697
1698out_path:
1699 dfprintk(MOUNT, "NFS: export pathname too long\n");
1700 return -ENAMETOOLONG;
1701}
1702
f7b422b1 1703/*
54ceac45
DH		 1704 * Validate the NFS2/NFS3 mount data
1705 * - fills in the mount root filehandle
136d558c
CL		 1706 *
1707 * For option strings, user space handles the following behaviors:
1708 *
1709 * + DNS: mapping server host name to IP address ("addr=" option)
1710 *
1711 * + failure mode: how to behave if a mount request can't be handled
1712 * immediately ("fg/bg" option)
1713 *
1714 * + retry: how often to retry a mount request ("retry=" option)
1715 *
1716 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1717 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1718 */
2283f8d6
TT		 1719static int nfs_validate_mount_data(void *options,
1720 struct nfs_parsed_mount_data *args,
136d558c
CL		 1721 struct nfs_fh *mntfh,
1722 const char *dev_name)
f7b422b1 1723{
2283f8d6 1724 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1725 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1726
5df36e78
CL		 1727 if (data == NULL)
1728 goto out_no_data;
f7b422b1 1729
54ceac45 1730 switch (data->version) {
5df36e78
CL		 1731 case 1:
1732 data->namlen = 0;
1733 case 2:
1734 data->bsize = 0;
1735 case 3:
1736 if (data->flags & NFS_MOUNT_VER3)
1737 goto out_no_v3;
1738 data->root.size = NFS2_FHSIZE;
1739 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1740 case 4:
1741 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1742 goto out_no_sec;
1743 case 5:
1744 memset(data->context, 0, sizeof(data->context));
1745 case 6:
b7e24457
TM		 1746 if (data->flags & NFS_MOUNT_VER3) {
1747 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1748 goto out_invalid_fh;
5df36e78 1749 mntfh->size = data->root.size;
764302cc
CL		 1750 args->version = 3;
1751 } else {
5df36e78 1752 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1753 args->version = 2;
1754 }
5df36e78 1755
5df36e78
CL		 1756
1757 memcpy(mntfh->data, data->root.data, mntfh->size);
1758 if (mntfh->size < sizeof(mntfh->data))
1759 memset(mntfh->data + mntfh->size, 0,
1760 sizeof(mntfh->data) - mntfh->size);
6e88e061 1761
2283f8d6
TT		 1762 /*
1763 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1764 * can deal with.
1765 */
ff3525a5 1766 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1767 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1768 args->rsize = data->rsize;
1769 args->wsize = data->wsize;
2283f8d6
TT		 1770 args->timeo = data->timeo;
1771 args->retrans = data->retrans;
1772 args->acregmin = data->acregmin;
1773 args->acregmax = data->acregmax;
1774 args->acdirmin = data->acdirmin;
1775 args->acdirmax = data->acdirmax;
4c568017 1776
4cfd74fc 1777 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1778 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1779 if (!nfs_verify_server_address(sap))
4c568017
CL		 1780 goto out_no_address;
1781
2283f8d6 1782 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1783 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1784 /* N.B. caller will free nfs_server.hostname in all cases */
1785 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1786 args->namlen = data->namlen;
1787 args->bsize = data->bsize;
dd07c947
CL		 1788
1789 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1790 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1791 if (!args->nfs_server.hostname)
1792 goto out_nomem;
f9c3a380 1793
5eebde23
SJ		 1794 if (!(data->flags & NFS_MOUNT_NONLM))
1795 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1796 NFS_MOUNT_LOCAL_FCNTL);
1797 else
1798 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1799 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1800 /*
1801 * The legacy version 6 binary mount data from userspace has a
1802 * field used only to transport selinux information into the
1803 * the kernel. To continue to support that functionality we
1804 * have a touch of selinux knowledge here in the NFS code. The
1805 * userspace code converted context=blah to just blah so we are
1806 * converting back to the full string selinux understands.
1807 */
1808 if (data->context[0]){
1809#ifdef CONFIG_SECURITY_SELINUX
1810 int rc;
1811 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1812 if (!opts_str)
1813 return -ENOMEM;
1814 strcpy(opts_str, "context=");
1815 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1816 strcat(opts_str, &data->context[0]);
1817 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1818 kfree(opts_str);
1819 if (rc)
1820 return rc;
1821#else
1822 return -EINVAL;
1823#endif
1824 }
1825
5df36e78 1826 break;
136d558c 1827 default: {
136d558c 1828 int status;
136d558c 1829
2283f8d6
TT		 1830 if (nfs_parse_mount_options((char *)options, args) == 0)
1831 return -EINVAL;
136d558c 1832
4cfd74fc 1833 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1834 goto out_no_address;
1835
764302cc
CL		 1836 if (args->version == 4)
1837#ifdef CONFIG_NFS_V4
1838 return nfs4_validate_text_mount_data(options,
1839 args, dev_name);
1840#else
1841 goto out_v4_not_compiled;
1842#endif
1843
f5855fec 1844 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1845
259875ef
TM		 1846 nfs_set_mount_transport_protocol(args);
1847
dc045898
CL		 1848 status = nfs_parse_devname(dev_name,
1849 &args->nfs_server.hostname,
1850 PAGE_SIZE,
1851 &args->nfs_server.export_path,
1852 NFS_MAXPATHLEN);
1853 if (!status)
1854 status = nfs_try_mount(args, mntfh);
136d558c 1855
dc045898
CL		 1856 kfree(args->nfs_server.export_path);
1857 args->nfs_server.export_path = NULL;
136d558c 1858
136d558c 1859 if (status)
fdc6e2c8 1860 return status;
136d558c 1861
136d558c
CL		 1862 break;
1863 }
f7b422b1 1864 }
54ceac45
DH		 1865
1866#ifndef CONFIG_NFS_V3
8a6e5deb 1867 if (args->version == 3)
5df36e78
CL		 1868 goto out_v3_not_compiled;
1869#endif /* !CONFIG_NFS_V3 */
f7b422b1 1870
5df36e78 1871 return 0;
f7b422b1 1872
5df36e78
CL		 1873out_no_data:
1874 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1875 return -EINVAL;
54ceac45 1876
5df36e78
CL		 1877out_no_v3:
1878 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1879 data->version);
1880 return -EINVAL;
f7b422b1 1881
5df36e78
CL		 1882out_no_sec:
1883 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1884 return -EINVAL;
1885
5df36e78
CL		 1886#ifndef CONFIG_NFS_V3
1887out_v3_not_compiled:
1888 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1889 return -EPROTONOSUPPORT;
1890#endif /* !CONFIG_NFS_V3 */
1891
764302cc
CL		 1892#ifndef CONFIG_NFS_V4
1893out_v4_not_compiled:
1894 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1895 return -EPROTONOSUPPORT;
1896#endif /* !CONFIG_NFS_V4 */
1897
63649bd7
CG		 1898out_nomem:
1899 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1900 return -ENOMEM;
1901
5df36e78
CL		 1902out_no_address:
1903 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1904 return -EINVAL;
1905
1906out_invalid_fh:
1907 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1908 return -EINVAL;
f7b422b1
DH		 1909}
1910
48b605f8
JL		 1911static int
1912nfs_compare_remount_data(struct nfs_server *nfss,
1913 struct nfs_parsed_mount_data *data)
1914{
1915 if (data->flags != nfss->flags ||
1916 data->rsize != nfss->rsize ||
1917 data->wsize != nfss->wsize ||
1918 data->retrans != nfss->client->cl_timeout->to_retries ||
1919 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1920 data->acregmin != nfss->acregmin / HZ ||
1921 data->acregmax != nfss->acregmax / HZ ||
1922 data->acdirmin != nfss->acdirmin / HZ ||
1923 data->acdirmax != nfss->acdirmax / HZ ||
1924 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1925 data->nfs_server.port != nfss->port ||
48b605f8 1926 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1927 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1928 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1929 return -EINVAL;
1930
1931 return 0;
1932}
1933
1934static int
1935nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1936{
1937 int error;
1938 struct nfs_server *nfss = sb->s_fs_info;
1939 struct nfs_parsed_mount_data *data;
1940 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1941 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1942 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1943
1944 /*
1945 * Userspace mount programs that send binary options generally send
1946 * them populated with default values. We have no way to know which
1947 * ones were explicitly specified. Fall back to legacy behavior and
1948 * just return success.
1949 */
31c94469
MZ		 1950 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1951 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1952 options->version <= 6))))
48b605f8
JL		 1953 return 0;
1954
1955 data = kzalloc(sizeof(*data), GFP_KERNEL);
1956 if (data == NULL)
1957 return -ENOMEM;
1958
1959 /* fill out struct with values from existing mount */
1960 data->flags = nfss->flags;
1961 data->rsize = nfss->rsize;
1962 data->wsize = nfss->wsize;
1963 data->retrans = nfss->client->cl_timeout->to_retries;
1964 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1965 data->acregmin = nfss->acregmin / HZ;
1966 data->acregmax = nfss->acregmax / HZ;
1967 data->acdirmin = nfss->acdirmin / HZ;
1968 data->acdirmax = nfss->acdirmax / HZ;
1969 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 1970 data->nfs_server.port = nfss->port;
48b605f8
JL		 1971 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1972 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1973 data->nfs_server.addrlen);
1974
1975 /* overwrite those values with any that were specified */
1976 error = nfs_parse_mount_options((char *)options, data);
1977 if (error < 0)
1978 goto out;
1979
1980 /* compare new mount options with old ones */
1981 error = nfs_compare_remount_data(nfss, data);
1982out:
1983 kfree(data);
1984 return error;
1985}
1986
f7b422b1 1987/*
54ceac45 1988 * Initialise the common bits of the superblock
f7b422b1 1989 */
54ceac45 1990static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 1991{
54ceac45 1992 struct nfs_server *server = NFS_SB(sb);
5006a76c 1993
54ceac45 1994 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 1995
54ceac45
DH		 1996 /* We probably want something more informative here */
1997 snprintf(sb->s_id, sizeof(sb->s_id),
1998 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 1999
54ceac45
DH		 2000 if (sb->s_blocksize == 0)
2001 sb->s_blocksize = nfs_block_bits(server->wsize,
2002 &sb->s_blocksize_bits);
f7b422b1 2003
54ceac45
DH		 2004 if (server->flags & NFS_MOUNT_NOAC)
2005 sb->s_flags |= MS_SYNCHRONOUS;
f7b422b1 2006
32a88aa1
JA		 2007 sb->s_bdi = &server->backing_dev_info;
2008
54ceac45 2009 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2010}
2011
2012/*
54ceac45 2013 * Finish setting up an NFS2/3 superblock
f7b422b1 2014 */
2283f8d6
TT		 2015static void nfs_fill_super(struct super_block *sb,
2016 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2017{
2018 struct nfs_server *server = NFS_SB(sb);
5006a76c 2019
54ceac45
DH		 2020 sb->s_blocksize_bits = 0;
2021 sb->s_blocksize = 0;
2022 if (data->bsize)
2023 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2024
8a6e5deb 2025 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2026 /* The VFS shouldn't apply the umask to mode bits. We will do
2027 * so ourselves when necessary.
2028 */
2029 sb->s_flags |= MS_POSIXACL;
2030 sb->s_time_gran = 1;
816724e6 2031 }
54ceac45
DH		 2032
2033 sb->s_op = &nfs_sops;
2034 nfs_initialise_sb(sb);
f7b422b1
DH		 2035}
2036
2037/*
54ceac45 2038 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2039 */
54ceac45
DH		 2040static void nfs_clone_super(struct super_block *sb,
2041 const struct super_block *old_sb)
f7b422b1 2042{
54ceac45
DH		 2043 struct nfs_server *server = NFS_SB(sb);
2044
2045 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2046 sb->s_blocksize = old_sb->s_blocksize;
2047 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2048
8a6e5deb 2049 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2050 /* The VFS shouldn't apply the umask to mode bits. We will do
2051 * so ourselves when necessary.
f7b422b1
DH		 2052 */
2053 sb->s_flags |= MS_POSIXACL;
f7b422b1 2054 sb->s_time_gran = 1;
f7b422b1
DH		 2055 }
2056
54ceac45
DH		 2057 sb->s_op = old_sb->s_op;
2058 nfs_initialise_sb(sb);
f7b422b1
DH		 2059}
2060
275a5d24
TM		 2061static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2062{
2063 const struct nfs_server *a = s->s_fs_info;
2064 const struct rpc_clnt *clnt_a = a->client;
2065 const struct rpc_clnt *clnt_b = b->client;
2066
2067 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2068 goto Ebusy;
2069 if (a->nfs_client != b->nfs_client)
2070 goto Ebusy;
2071 if (a->flags != b->flags)
2072 goto Ebusy;
2073 if (a->wsize != b->wsize)
2074 goto Ebusy;
2075 if (a->rsize != b->rsize)
2076 goto Ebusy;
2077 if (a->acregmin != b->acregmin)
2078 goto Ebusy;
2079 if (a->acregmax != b->acregmax)
2080 goto Ebusy;
2081 if (a->acdirmin != b->acdirmin)
2082 goto Ebusy;
2083 if (a->acdirmax != b->acdirmax)
2084 goto Ebusy;
2085 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2086 goto Ebusy;
e89a5a43 2087 return 1;
275a5d24 2088Ebusy:
e89a5a43
TM		 2089 return 0;
2090}
2091
2092struct nfs_sb_mountdata {
2093 struct nfs_server *server;
2094 int mntflags;
2095};
2096
2097static int nfs_set_super(struct super_block *s, void *data)
2098{
2099 struct nfs_sb_mountdata *sb_mntdata = data;
2100 struct nfs_server *server = sb_mntdata->server;
2101 int ret;
2102
2103 s->s_flags = sb_mntdata->mntflags;
2104 s->s_fs_info = server;
8b244ff2 2105 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2106 ret = set_anon_super(s, server);
2107 if (ret == 0)
2108 server->s_dev = s->s_dev;
2109 return ret;
2110}
2111
fd00a8ff
CL		 2112static int nfs_compare_super_address(struct nfs_server *server1,
2113 struct nfs_server *server2)
2114{
2115 struct sockaddr *sap1, *sap2;
2116
2117 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2118 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2119
2120 if (sap1->sa_family != sap2->sa_family)
2121 return 0;
2122
2123 switch (sap1->sa_family) {
2124 case AF_INET: {
2125 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2126 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2127 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2128 return 0;
2129 if (sin1->sin_port != sin2->sin_port)
2130 return 0;
2131 break;
2132 }
2133 case AF_INET6: {
2134 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2135 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2136 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2137 return 0;
2138 if (sin1->sin6_port != sin2->sin6_port)
2139 return 0;
2140 break;
2141 }
2142 default:
2143 return 0;
2144 }
2145
2146 return 1;
2147}
2148
e89a5a43
TM		 2149static int nfs_compare_super(struct super_block *sb, void *data)
2150{
2151 struct nfs_sb_mountdata *sb_mntdata = data;
2152 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2153 int mntflags = sb_mntdata->mntflags;
2154
fd00a8ff 2155 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2156 return 0;
2157 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2158 if (old->flags & NFS_MOUNT_UNSHARED)
2159 return 0;
2160 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2161 return 0;
2162 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2163}
2164
fa799759
MS		 2165static int nfs_bdi_register(struct nfs_server *server)
2166{
2167 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2168}
2169
01194981
AV		 2170static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2171 int flags, const char *dev_name, void *raw_data)
f7b422b1 2172{
f7b422b1
DH		 2173 struct nfs_server *server = NULL;
2174 struct super_block *s;
33852a1f
TM		 2175 struct nfs_parsed_mount_data *data;
2176 struct nfs_fh *mntfh;
01194981 2177 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2178 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2179 struct nfs_sb_mountdata sb_mntdata = {
2180 .mntflags = flags,
2181 };
01194981 2182 int error;
33852a1f 2183
1e657bd5 2184 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2185 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2186 if (data == NULL || mntfh == NULL)
2187 goto out_free_fh;
f7b422b1 2188
33852a1f 2189 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2190
54ceac45 2191 /* Validate the mount data */
33852a1f 2192 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2193 if (error < 0) {
2194 mntroot = ERR_PTR(error);
0655960f 2195 goto out;
01194981 2196 }
f7b422b1 2197
764302cc
CL		 2198#ifdef CONFIG_NFS_V4
2199 if (data->version == 4) {
01194981 2200 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc 2201 kfree(data->client_address);
9699eda6 2202 kfree(data->nfs_server.export_path);
764302cc
CL		 2203 goto out;
2204 }
2205#endif /* CONFIG_NFS_V4 */
2206
54ceac45 2207 /* Get a volume representation */
33852a1f 2208 server = nfs_create_server(data, mntfh);
54ceac45 2209 if (IS_ERR(server)) {
01194981 2210 mntroot = ERR_CAST(server);
0655960f 2211 goto out;
f7b422b1 2212 }
e89a5a43 2213 sb_mntdata.server = server;
f7b422b1 2214
75180df2
TM		 2215 if (server->flags & NFS_MOUNT_UNSHARED)
2216 compare_super = NULL;
2217
54ceac45 2218 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2219 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2220 if (IS_ERR(s)) {
01194981 2221 mntroot = ERR_CAST(s);
54ceac45 2222 goto out_err_nosb;
816724e6
TM		 2223 }
2224
54ceac45
DH		 2225 if (s->s_fs_info != server) {
2226 nfs_free_server(server);
2227 server = NULL;
fa799759
MS		 2228 } else {
2229 error = nfs_bdi_register(server);
01194981
AV		 2230 if (error) {
2231 mntroot = ERR_PTR(error);
cfbc0683 2232 goto error_splat_bdi;
01194981 2233 }
54ceac45 2234 }
f7b422b1 2235
54ceac45
DH		 2236 if (!s->s_root) {
2237 /* initial superblock/root creation */
33852a1f 2238 nfs_fill_super(s, data);
160bc160 2239 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2240 }
f7b422b1 2241
0d5839ad 2242 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2243 if (IS_ERR(mntroot))
54ceac45 2244 goto error_splat_super;
816724e6 2245
33852a1f 2246 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2247 if (error)
2248 goto error_splat_root;
2249
54ceac45 2250 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2251
2252out:
33852a1f
TM		 2253 kfree(data->nfs_server.hostname);
2254 kfree(data->mount_server.hostname);
08734048 2255 kfree(data->fscache_uniq);
33852a1f
TM		 2256 security_free_mnt_opts(&data->lsm_opts);
2257out_free_fh:
b157b06c 2258 nfs_free_fhandle(mntfh);
33852a1f 2259 kfree(data);
01194981 2260 return mntroot;
816724e6 2261
54ceac45
DH		 2262out_err_nosb:
2263 nfs_free_server(server);
0655960f 2264 goto out;
54ceac45 2265
f9c3a380
EP		 2266error_splat_root:
2267 dput(mntroot);
01194981 2268 mntroot = ERR_PTR(error);
54ceac45 2269error_splat_super:
cfbc0683
N		 2270 if (server && !s->s_root)
2271 bdi_unregister(&server->backing_dev_info);
2272error_splat_bdi:
6f5bbff9 2273 deactivate_locked_super(s);
0655960f 2274 goto out;
f7b422b1
DH		 2275}
2276
387c149b
TM		 2277/*
2278 * Ensure that we unregister the bdi before kill_anon_super
2279 * releases the device name
2280 */
2281static void nfs_put_super(struct super_block *s)
2282{
2283 struct nfs_server *server = NFS_SB(s);
2284
2285 bdi_unregister(&server->backing_dev_info);
2286}
2287
54ceac45
DH		 2288/*
2289 * Destroy an NFS2/3 superblock
2290 */
f7b422b1
DH		 2291static void nfs_kill_super(struct super_block *s)
2292{
2293 struct nfs_server *server = NFS_SB(s);
2294
2295 kill_anon_super(s);
08734048 2296 nfs_fscache_release_super_cookie(s);
54ceac45 2297 nfs_free_server(server);
f7b422b1
DH		 2298}
2299
54ceac45
DH		 2300/*
2301 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2302 */
31f43471
AV		 2303static struct dentry *
2304nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2305 const char *dev_name, void *raw_data)
f7b422b1
DH		 2306{
2307 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2308 struct super_block *s;
2309 struct nfs_server *server;
2310 struct dentry *mntroot;
75180df2 2311 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2312 struct nfs_sb_mountdata sb_mntdata = {
2313 .mntflags = flags,
2314 };
54ceac45 2315 int error;
f7b422b1 2316
31f43471 2317 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2318
54ceac45
DH		 2319 /* create a new volume representation */
2320 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2321 if (IS_ERR(server)) {
2322 error = PTR_ERR(server);
2323 goto out_err_noserver;
2324 }
e89a5a43 2325 sb_mntdata.server = server;
8fa5c000 2326
75180df2
TM		 2327 if (server->flags & NFS_MOUNT_UNSHARED)
2328 compare_super = NULL;
2329
54ceac45 2330 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2331 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2332 if (IS_ERR(s)) {
2333 error = PTR_ERR(s);
2334 goto out_err_nosb;
2335 }
5006a76c 2336
54ceac45
DH		 2337 if (s->s_fs_info != server) {
2338 nfs_free_server(server);
2339 server = NULL;
fa799759
MS		 2340 } else {
2341 error = nfs_bdi_register(server);
2342 if (error)
cfbc0683 2343 goto error_splat_bdi;
f7b422b1 2344 }
24c8dbbb 2345
54ceac45
DH		 2346 if (!s->s_root) {
2347 /* initial superblock/root creation */
54ceac45 2348 nfs_clone_super(s, data->sb);
2df54806 2349 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2350 }
f7b422b1 2351
0d5839ad 2352 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2353 if (IS_ERR(mntroot)) {
2354 error = PTR_ERR(mntroot);
2355 goto error_splat_super;
f7b422b1 2356 }
e9cc6c23 2357 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2358 dput(mntroot);
2359 error = -ESTALE;
2360 goto error_splat_super;
2361 }
f7b422b1 2362
54ceac45 2363 s->s_flags |= MS_ACTIVE;
f7b422b1 2364
f9c3a380
EP		 2365 /* clone any lsm security options from the parent to the new sb */
2366 security_sb_clone_mnt_opts(data->sb, s);
2367
31f43471
AV		 2368 dprintk("<-- nfs_xdev_mount() = 0\n");
2369 return mntroot;
24c8dbbb 2370
54ceac45
DH		 2371out_err_nosb:
2372 nfs_free_server(server);
2373out_err_noserver:
31f43471
AV		 2374 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2375 return ERR_PTR(error);
f7b422b1 2376
54ceac45 2377error_splat_super:
cfbc0683
N		 2378 if (server && !s->s_root)
2379 bdi_unregister(&server->backing_dev_info);
2380error_splat_bdi:
6f5bbff9 2381 deactivate_locked_super(s);
31f43471
AV		 2382 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2383 return ERR_PTR(error);
f7b422b1
DH		 2384}
2385
54ceac45
DH		 2386#ifdef CONFIG_NFS_V4
2387
f7b422b1 2388/*
54ceac45 2389 * Finish setting up a cloned NFS4 superblock
f7b422b1 2390 */
54ceac45
DH		 2391static void nfs4_clone_super(struct super_block *sb,
2392 const struct super_block *old_sb)
f7b422b1 2393{
54ceac45
DH		 2394 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2395 sb->s_blocksize = old_sb->s_blocksize;
2396 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2397 sb->s_time_gran = 1;
54ceac45 2398 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2399 /*
2400 * The VFS shouldn't apply the umask to mode bits. We will do
2401 * so ourselves when necessary.
2402 */
2403 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2404 sb->s_xattr = old_sb->s_xattr;
2405 nfs_initialise_sb(sb);
f7b422b1
DH		 2406}
2407
54ceac45
DH		 2408/*
2409 * Set up an NFS4 superblock
2410 */
2411static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2412{
54ceac45
DH		 2413 sb->s_time_gran = 1;
2414 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2415 /*
2416 * The VFS shouldn't apply the umask to mode bits. We will do
2417 * so ourselves when necessary.
2418 */
2419 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2420 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2421 nfs_initialise_sb(sb);
f7b422b1
DH		 2422}
2423
01c3f052
TM		 2424static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2425{
5eebde23
SJ		 2426 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2427 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2428}
2429
7630c852
CL		 2430static int nfs4_validate_text_mount_data(void *options,
2431 struct nfs_parsed_mount_data *args,
2432 const char *dev_name)
2433{
2434 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2435
f5855fec 2436 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2437
2438 nfs_validate_transport_protocol(args);
2439
2440 nfs4_validate_mount_flags(args);
2441
2ecda72b
TM		 2442 if (args->version != 4) {
2443 dfprintk(MOUNT,
2444 "NFS4: Illegal mount version\n");
2445 return -EINVAL;
2446 }
2447
7630c852
CL		 2448 if (args->auth_flavor_len > 1) {
2449 dfprintk(MOUNT,
2450 "NFS4: Too many RPC auth flavours specified\n");
2451 return -EINVAL;
2452 }
2453
2454 if (args->client_address == NULL) {
2455 dfprintk(MOUNT,
2456 "NFS4: mount program didn't pass callback address\n");
2457 return -EINVAL;
2458 }
2459
2460 return nfs_parse_devname(dev_name,
2461 &args->nfs_server.hostname,
2462 NFS4_MAXNAMLEN,
2463 &args->nfs_server.export_path,
2464 NFS4_MAXPATHLEN);
2465}
2466
f0768ebd
CL		 2467/*
2468 * Validate NFSv4 mount options
2469 */
91ea40b9
TT		 2470static int nfs4_validate_mount_data(void *options,
2471 struct nfs_parsed_mount_data *args,
2472 const char *dev_name)
f0768ebd 2473{
4cfd74fc 2474 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2475 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2476 char *c;
2477
2478 if (data == NULL)
2479 goto out_no_data;
2480
2481 switch (data->version) {
2482 case 1:
4c568017
CL		 2483 if (data->host_addrlen > sizeof(args->nfs_server.address))
2484 goto out_no_address;
2485 if (data->host_addrlen == 0)
f0768ebd 2486 goto out_no_address;
4c568017 2487 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2488 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2489 return -EFAULT;
4cfd74fc 2490 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2491 goto out_no_address;
2492
6738b251
CL		 2493 if (data->auth_flavourlen) {
2494 if (data->auth_flavourlen > 1)
2495 goto out_inval_auth;
20c71f5e 2496 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2497 data->auth_flavours,
20c71f5e 2498 sizeof(args->auth_flavors[0])))
f0768ebd 2499 return -EFAULT;
f0768ebd
CL		 2500 }
2501
2502 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2503 if (IS_ERR(c))
2504 return PTR_ERR(c);
91ea40b9 2505 args->nfs_server.hostname = c;
f0768ebd
CL		 2506
2507 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2508 if (IS_ERR(c))
2509 return PTR_ERR(c);
91ea40b9
TT		 2510 args->nfs_server.export_path = c;
2511 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2512
2513 c = strndup_user(data->client_addr.data, 16);
2514 if (IS_ERR(c))
2515 return PTR_ERR(c);
91ea40b9
TT		 2516 args->client_address = c;
2517
2518 /*
2519 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2520 * can deal with.
2521 */
2522
2523 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2524 args->rsize = data->rsize;
2525 args->wsize = data->wsize;
2526 args->timeo = data->timeo;
2527 args->retrans = data->retrans;
2528 args->acregmin = data->acregmin;
2529 args->acregmax = data->acregmax;
2530 args->acdirmin = data->acdirmin;
2531 args->acdirmax = data->acdirmax;
2532 args->nfs_server.protocol = data->proto;
259875ef 2533 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2534
2535 break;
7630c852 2536 default:
91ea40b9 2537 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2538 return -EINVAL;
2539
4cfd74fc 2540 if (!nfs_verify_server_address(sap))
80071225 2541 return -EINVAL;
dc045898 2542
7630c852 2543 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2544 }
2545
2546 return 0;
2547
2548out_no_data:
2549 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2550 return -EINVAL;
2551
2552out_inval_auth:
2553 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2554 data->auth_flavourlen);
2555 return -EINVAL;
2556
2557out_no_address:
2558 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2559 return -EINVAL;
f0768ebd
CL		 2560}
2561
54ceac45 2562/*
c02d7adf 2563 * Get the superblock for the NFS4 root partition
54ceac45 2564 */
31f43471
AV		 2565static struct dentry *
2566nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2567 const char *dev_name, void *raw_data)
f7b422b1 2568{
c02d7adf 2569 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2570 struct super_block *s;
2571 struct nfs_server *server;
33852a1f 2572 struct nfs_fh *mntfh;
54ceac45 2573 struct dentry *mntroot;
75180df2 2574 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2575 struct nfs_sb_mountdata sb_mntdata = {
2576 .mntflags = flags,
2577 };
33852a1f
TM		 2578 int error = -ENOMEM;
2579
b157b06c 2580 mntfh = nfs_alloc_fhandle();
33852a1f
TM		 2581 if (data == NULL || mntfh == NULL)
2582 goto out_free_fh;
f7b422b1 2583
33852a1f 2584 security_init_mnt_opts(&data->lsm_opts);
f9c3a380 2585
54ceac45 2586 /* Get a volume representation */
33852a1f 2587 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2588 if (IS_ERR(server)) {
2589 error = PTR_ERR(server);
29eb981a 2590 goto out;
f7b422b1 2591 }
e89a5a43 2592 sb_mntdata.server = server;
f7b422b1 2593
75180df2
TM		 2594 if (server->flags & NFS4_MOUNT_UNSHARED)
2595 compare_super = NULL;
2596
54ceac45 2597 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2598 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2599 if (IS_ERR(s)) {
2600 error = PTR_ERR(s);
f7b422b1 2601 goto out_free;
816724e6
TM		 2602 }
2603
5dd3177a
TM		 2604 if (s->s_fs_info != server) {
2605 nfs_free_server(server);
2606 server = NULL;
fa799759
MS		 2607 } else {
2608 error = nfs_bdi_register(server);
2609 if (error)
cfbc0683 2610 goto error_splat_bdi;
5dd3177a
TM		 2611 }
2612
54ceac45
DH		 2613 if (!s->s_root) {
2614 /* initial superblock/root creation */
54ceac45 2615 nfs4_fill_super(s);
2df54806
DH		 2616 nfs_fscache_get_super_cookie(
2617 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2618 }
f7b422b1 2619
0d5839ad 2620 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2621 if (IS_ERR(mntroot)) {
2622 error = PTR_ERR(mntroot);
2623 goto error_splat_super;
f7b422b1 2624 }
54ceac45 2625
33852a1f 2626 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2627 if (error)
2628 goto error_splat_root;
2629
f7b422b1 2630 s->s_flags |= MS_ACTIVE;
31f43471
AV		 2631
2632 security_free_mnt_opts(&data->lsm_opts);
2633 nfs_free_fhandle(mntfh);
2634 return mntroot;
29eb981a
CL		 2635
2636out:
33852a1f
TM		 2637 security_free_mnt_opts(&data->lsm_opts);
2638out_free_fh:
b157b06c 2639 nfs_free_fhandle(mntfh);
31f43471 2640 return ERR_PTR(error);
54ceac45 2641
f7b422b1 2642out_free:
54ceac45 2643 nfs_free_server(server);
29eb981a 2644 goto out;
54ceac45 2645
46c8ac74
EP		 2646error_splat_root:
2647 dput(mntroot);
54ceac45 2648error_splat_super:
cfbc0683
N		 2649 if (server && !s->s_root)
2650 bdi_unregister(&server->backing_dev_info);
2651error_splat_bdi:
6f5bbff9 2652 deactivate_locked_super(s);
29eb981a 2653 goto out;
f7b422b1
DH		 2654}
2655
c02d7adf
TM		 2656static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2657 int flags, void *data, const char *hostname)
2658{
2659 struct vfsmount *root_mnt;
2660 char *root_devname;
2661 size_t len;
2662
2663 len = strlen(hostname) + 3;
2664 root_devname = kmalloc(len, GFP_KERNEL);
2665 if (root_devname == NULL)
2666 return ERR_PTR(-ENOMEM);
2667 snprintf(root_devname, len, "%s:/", hostname);
2668 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2669 kfree(root_devname);
2670 return root_mnt;
2671}
2672
ce587e07
TM		 2673struct nfs_referral_count {
2674 struct list_head list;
2675 const struct task_struct *task;
2676 unsigned int referral_count;
2677};
2678
2679static LIST_HEAD(nfs_referral_count_list);
2680static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2681
2682static struct nfs_referral_count *nfs_find_referral_count(void)
2683{
2684 struct nfs_referral_count *p;
2685
2686 list_for_each_entry(p, &nfs_referral_count_list, list) {
2687 if (p->task == current)
2688 return p;
2689 }
2690 return NULL;
2691}
2692
2693#define NFS_MAX_NESTED_REFERRALS 2
2694
2695static int nfs_referral_loop_protect(void)
2696{
2697 struct nfs_referral_count *p, *new;
2698 int ret = -ENOMEM;
2699
2700 new = kmalloc(sizeof(*new), GFP_KERNEL);
2701 if (!new)
2702 goto out;
2703 new->task = current;
2704 new->referral_count = 1;
2705
2706 ret = 0;
2707 spin_lock(&nfs_referral_count_list_lock);
2708 p = nfs_find_referral_count();
2709 if (p != NULL) {
2710 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2711 ret = -ELOOP;
2712 else
2713 p->referral_count++;
2714 } else {
2715 list_add(&new->list, &nfs_referral_count_list);
2716 new = NULL;
2717 }
2718 spin_unlock(&nfs_referral_count_list_lock);
2719 kfree(new);
2720out:
2721 return ret;
2722}
2723
2724static void nfs_referral_loop_unprotect(void)
2725{
2726 struct nfs_referral_count *p;
2727
2728 spin_lock(&nfs_referral_count_list_lock);
2729 p = nfs_find_referral_count();
2730 p->referral_count--;
2731 if (p->referral_count == 0)
2732 list_del(&p->list);
2733 else
2734 p = NULL;
2735 spin_unlock(&nfs_referral_count_list_lock);
2736 kfree(p);
2737}
2738
01194981
AV		 2739static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2740 const char *export_path)
c02d7adf 2741{
04ffdbe2 2742 struct nameidata *nd = NULL;
a2770d86 2743 struct mnt_namespace *ns_private;
c02d7adf 2744 struct super_block *s;
01194981 2745 struct dentry *dentry;
c02d7adf
TM		 2746 int ret;
2747
04ffdbe2
TM		 2748 nd = kmalloc(sizeof(*nd), GFP_KERNEL);
2749 if (nd == NULL)
01194981 2750 return ERR_PTR(-ENOMEM);
04ffdbe2 2751
a2770d86
LT		 2752 ns_private = create_mnt_ns(root_mnt);
2753 ret = PTR_ERR(ns_private);
2754 if (IS_ERR(ns_private))
2755 goto out_mntput;
2756
ce587e07
TM		 2757 ret = nfs_referral_loop_protect();
2758 if (ret != 0)
2759 goto out_put_mnt_ns;
2760
c02d7adf 2761 ret = vfs_path_lookup(root_mnt->mnt_root, root_mnt,
04ffdbe2 2762 export_path, LOOKUP_FOLLOW, nd);
c02d7adf 2763
ce587e07 2764 nfs_referral_loop_unprotect();
a2770d86
LT		 2765 put_mnt_ns(ns_private);
2766
c02d7adf
TM		 2767 if (ret != 0)
2768 goto out_err;
2769
04ffdbe2 2770 s = nd->path.mnt->mnt_sb;
c02d7adf 2771 atomic_inc(&s->s_active);
01194981 2772 dentry = dget(nd->path.dentry);
c02d7adf 2773
04ffdbe2
TM		 2774 path_put(&nd->path);
2775 kfree(nd);
c02d7adf 2776 down_write(&s->s_umount);
01194981 2777 return dentry;
ce587e07
TM		 2778out_put_mnt_ns:
2779 put_mnt_ns(ns_private);
c02d7adf
TM		 2780out_mntput:
2781 mntput(root_mnt);
2782out_err:
04ffdbe2 2783 kfree(nd);
01194981 2784 return ERR_PTR(ret);
c02d7adf
TM		 2785}
2786
01194981
AV		 2787static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2788 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2789{
2790 char *export_path;
2791 struct vfsmount *root_mnt;
01194981 2792 struct dentry *res;
a6fe23be
CL		 2793
2794 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2795
2796 export_path = data->nfs_server.export_path;
2797 data->nfs_server.export_path = "/";
2798 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2799 data->nfs_server.hostname);
2800 data->nfs_server.export_path = export_path;
2801
01194981
AV		 2802 res = ERR_CAST(root_mnt);
2803 if (!IS_ERR(root_mnt))
2804 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2805
01194981
AV		 2806 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2807 IS_ERR(res) ? PTR_ERR(res) : 0,
2808 IS_ERR(res) ? " [error]" : "");
2809 return res;
a6fe23be
CL		 2810}
2811
c02d7adf
TM		 2812/*
2813 * Get the superblock for an NFS4 mountpoint
2814 */
01194981
AV		 2815static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2816 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2817{
2818 struct nfs_parsed_mount_data *data;
c02d7adf 2819 int error = -ENOMEM;
01194981 2820 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2821
c5811dbd 2822 data = nfs_alloc_parsed_mount_data(4);
c02d7adf
TM		 2823 if (data == NULL)
2824 goto out_free_data;
2825
2826 /* Validate the mount data */
2827 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2828 if (error < 0) {
2829 res = ERR_PTR(error);
c02d7adf 2830 goto out;
01194981 2831 }
c02d7adf 2832
01194981
AV		 2833 res = nfs4_try_mount(flags, dev_name, data);
2834 if (IS_ERR(res))
2835 error = PTR_ERR(res);
c02d7adf
TM		 2836
2837out:
2838 kfree(data->client_address);
2839 kfree(data->nfs_server.export_path);
2840 kfree(data->nfs_server.hostname);
2841 kfree(data->fscache_uniq);
2842out_free_data:
2843 kfree(data);
01194981 2844 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2845 error != 0 ? " [error]" : "");
01194981 2846 return res;
c02d7adf
TM		 2847}
2848
f7b422b1
DH		 2849static void nfs4_kill_super(struct super_block *sb)
2850{
2851 struct nfs_server *server = NFS_SB(sb);
2852
0f3e66c6 2853 dprintk("--> %s\n", __func__);
515d8611 2854 nfs_super_return_all_delegations(sb);
f7b422b1 2855 kill_anon_super(sb);
08734048 2856 nfs_fscache_release_super_cookie(sb);
54ceac45 2857 nfs_free_server(server);
0f3e66c6 2858 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2859}
2860
2861/*
54ceac45 2862 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2863 */
31f43471
AV		 2864static struct dentry *
2865nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2866 const char *dev_name, void *raw_data)
f7b422b1 2867{
54ceac45
DH		 2868 struct nfs_clone_mount *data = raw_data;
2869 struct super_block *s;
2870 struct nfs_server *server;
2871 struct dentry *mntroot;
75180df2 2872 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2873 struct nfs_sb_mountdata sb_mntdata = {
2874 .mntflags = flags,
2875 };
54ceac45 2876 int error;
f7b422b1 2877
31f43471 2878 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2879
54ceac45
DH		 2880 /* create a new volume representation */
2881 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2882 if (IS_ERR(server)) {
2883 error = PTR_ERR(server);
2884 goto out_err_noserver;
f7b422b1 2885 }
e89a5a43 2886 sb_mntdata.server = server;
f7b422b1 2887
75180df2
TM		 2888 if (server->flags & NFS4_MOUNT_UNSHARED)
2889 compare_super = NULL;
2890
54ceac45 2891 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2892 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2893 if (IS_ERR(s)) {
2894 error = PTR_ERR(s);
2895 goto out_err_nosb;
f7b422b1 2896 }
f7b422b1 2897
54ceac45
DH		 2898 if (s->s_fs_info != server) {
2899 nfs_free_server(server);
2900 server = NULL;
fa799759
MS		 2901 } else {
2902 error = nfs_bdi_register(server);
2903 if (error)
cfbc0683 2904 goto error_splat_bdi;
54ceac45 2905 }
f7b422b1 2906
54ceac45
DH		 2907 if (!s->s_root) {
2908 /* initial superblock/root creation */
54ceac45 2909 nfs4_clone_super(s, data->sb);
2df54806 2910 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2911 }
f7b422b1 2912
0d5839ad 2913 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 2914 if (IS_ERR(mntroot)) {
2915 error = PTR_ERR(mntroot);
2916 goto error_splat_super;
2917 }
e9cc6c23
TM		 2918 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2919 dput(mntroot);
2920 error = -ESTALE;
2921 goto error_splat_super;
2922 }
f7b422b1 2923
54ceac45 2924 s->s_flags |= MS_ACTIVE;
54ceac45 2925
46c8ac74
EP		 2926 security_sb_clone_mnt_opts(data->sb, s);
2927
31f43471
AV		 2928 dprintk("<-- nfs4_xdev_mount() = 0\n");
2929 return mntroot;
54ceac45
DH		 2930
2931out_err_nosb:
2932 nfs_free_server(server);
2933out_err_noserver:
31f43471
AV		 2934 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2935 return ERR_PTR(error);
54ceac45
DH		 2936
2937error_splat_super:
cfbc0683
N		 2938 if (server && !s->s_root)
2939 bdi_unregister(&server->backing_dev_info);
2940error_splat_bdi:
6f5bbff9 2941 deactivate_locked_super(s);
31f43471
AV		 2942 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2943 return ERR_PTR(error);
f7b422b1
DH		 2944}
2945
31f43471
AV		 2946static struct dentry *
2947nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2948 const char *dev_name, void *raw_data)
f7b422b1
DH		 2949{
2950 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2951 struct super_block *s;
2952 struct nfs_server *server;
2953 struct dentry *mntroot;
4f727296 2954 struct nfs_fh *mntfh;
75180df2 2955 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2956 struct nfs_sb_mountdata sb_mntdata = {
2957 .mntflags = flags,
2958 };
4f727296 2959 int error = -ENOMEM;
54ceac45
DH		 2960
2961 dprintk("--> nfs4_referral_get_sb()\n");
2962
4f727296
TM		 2963 mntfh = nfs_alloc_fhandle();
2964 if (mntfh == NULL)
2965 goto out_err_nofh;
2966
54ceac45 2967 /* create a new volume representation */
4f727296 2968 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 2969 if (IS_ERR(server)) {
2970 error = PTR_ERR(server);
2971 goto out_err_noserver;
2972 }
e89a5a43 2973 sb_mntdata.server = server;
54ceac45 2974
75180df2
TM		 2975 if (server->flags & NFS4_MOUNT_UNSHARED)
2976 compare_super = NULL;
2977
54ceac45 2978 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2979 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2980 if (IS_ERR(s)) {
2981 error = PTR_ERR(s);
2982 goto out_err_nosb;
2983 }
2984
2985 if (s->s_fs_info != server) {
2986 nfs_free_server(server);
2987 server = NULL;
fa799759
MS		 2988 } else {
2989 error = nfs_bdi_register(server);
2990 if (error)
cfbc0683 2991 goto error_splat_bdi;
54ceac45
DH		 2992 }
2993
2994 if (!s->s_root) {
2995 /* initial superblock/root creation */
54ceac45 2996 nfs4_fill_super(s);
2df54806 2997 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 2998 }
2999
0d5839ad 3000 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3001 if (IS_ERR(mntroot)) {
3002 error = PTR_ERR(mntroot);
3003 goto error_splat_super;
3004 }
e9cc6c23
TM		 3005 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3006 dput(mntroot);
3007 error = -ESTALE;
3008 goto error_splat_super;
3009 }
54ceac45
DH		 3010
3011 s->s_flags |= MS_ACTIVE;
54ceac45 3012
46c8ac74
EP		 3013 security_sb_clone_mnt_opts(data->sb, s);
3014
4f727296 3015 nfs_free_fhandle(mntfh);
54ceac45 3016 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3017 return mntroot;
54ceac45
DH		 3018
3019out_err_nosb:
3020 nfs_free_server(server);
3021out_err_noserver:
4f727296
TM		 3022 nfs_free_fhandle(mntfh);
3023out_err_nofh:
54ceac45 3024 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3025 return ERR_PTR(error);
54ceac45
DH		 3026
3027error_splat_super:
cfbc0683
N		 3028 if (server && !s->s_root)
3029 bdi_unregister(&server->backing_dev_info);
3030error_splat_bdi:
6f5bbff9 3031 deactivate_locked_super(s);
4f727296 3032 nfs_free_fhandle(mntfh);
54ceac45 3033 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3034 return ERR_PTR(error);
f7b422b1
DH		 3035}
3036
c02d7adf
TM		 3037/*
3038 * Create an NFS4 server record on referral traversal
3039 */
01194981
AV		 3040static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3041 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3042{
3043 struct nfs_clone_mount *data = raw_data;
3044 char *export_path;
3045 struct vfsmount *root_mnt;
01194981 3046 struct dentry *res;
c02d7adf 3047
01194981 3048 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3049
3050 export_path = data->mnt_path;
3051 data->mnt_path = "/";
3052
3053 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3054 flags, data, data->hostname);
3055 data->mnt_path = export_path;
3056
01194981
AV		 3057 res = ERR_CAST(root_mnt);
3058 if (!IS_ERR(root_mnt))
3059 res = nfs_follow_remote_path(root_mnt, export_path);
3060 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3061 IS_ERR(res) ? PTR_ERR(res) : 0,
3062 IS_ERR(res) ? " [error]" : "");
3063 return res;
c02d7adf
TM		 3064}
3065
54ceac45 3066#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)