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NFS: Extend the -overs= mount option to allow 4.x minorversions
[deliverable/linux.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
1e657bd5
PZ		 70#ifdef CONFIG_NFS_V3
71#define NFS_DEFAULT_VERSION 3
72#else
73#define NFS_DEFAULT_VERSION 2
74#endif
75
bf0fd768
CL		 76enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
bf0fd768
CL		 79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
7ced286e 83 Opt_v2, Opt_v3, Opt_v4, Opt_v4_0, Opt_v4_1,
2cf7ff7a 84 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
75180df2 87 Opt_sharecache, Opt_nosharecache,
d740351b 88 Opt_resvport, Opt_noresvport,
b797cac7 89 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
e887cbcf 100 Opt_mountvers,
3fd5be9e 101 Opt_minorversion,
bf0fd768
CL		 102
103 /* Mount options that take string arguments */
0d71b058 104 Opt_nfsvers,
33832034 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 107 Opt_lookupcache,
b797cac7 108 Opt_fscache_uniq,
5eebde23 109 Opt_local_lock,
bf0fd768 110
f45663ce
CL		 111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 113
114 Opt_err
115};
116
a447c093 117static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
ecbb3845
CL		 120 { Opt_userspace, "retry=%s" },
121
f45663ce
CL		 122 { Opt_sloppy, "sloppy" },
123
bf0fd768
CL		 124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
d33e4dfe
CL		 126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
bf0fd768
CL		 128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
764302cc 138 { Opt_v4, "v4" },
7ced286e
WAA		 139 { Opt_v4_0, "v4.0" },
140 { Opt_v4_1, "v4.1" },
bf0fd768
CL		 141 { Opt_udp, "udp" },
142 { Opt_tcp, "tcp" },
2cf7ff7a 143 { Opt_rdma, "rdma" },
bf0fd768
CL		 144 { Opt_acl, "acl" },
145 { Opt_noacl, "noacl" },
146 { Opt_rdirplus, "rdirplus" },
147 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 148 { Opt_sharecache, "sharecache" },
149 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 150 { Opt_resvport, "resvport" },
151 { Opt_noresvport, "noresvport" },
b797cac7 152 { Opt_fscache, "fsc" },
b797cac7 153 { Opt_nofscache, "nofsc" },
bf0fd768 154
a5a16bae
CL		 155 { Opt_port, "port=%s" },
156 { Opt_rsize, "rsize=%s" },
157 { Opt_wsize, "wsize=%s" },
158 { Opt_bsize, "bsize=%s" },
159 { Opt_timeo, "timeo=%s" },
160 { Opt_retrans, "retrans=%s" },
161 { Opt_acregmin, "acregmin=%s" },
162 { Opt_acregmax, "acregmax=%s" },
163 { Opt_acdirmin, "acdirmin=%s" },
164 { Opt_acdirmax, "acdirmax=%s" },
165 { Opt_actimeo, "actimeo=%s" },
166 { Opt_namelen, "namlen=%s" },
167 { Opt_mountport, "mountport=%s" },
168 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 169 { Opt_minorversion, "minorversion=%s" },
170
a5a16bae
CL		 171 { Opt_nfsvers, "nfsvers=%s" },
172 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 173
174 { Opt_sec, "sec=%s" },
175 { Opt_proto, "proto=%s" },
176 { Opt_mountproto, "mountproto=%s" },
177 { Opt_addr, "addr=%s" },
178 { Opt_clientaddr, "clientaddr=%s" },
33832034 179 { Opt_mounthost, "mounthost=%s" },
0ac83779 180 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 181
7973c1f1 182 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 183 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 184 { Opt_local_lock, "local_lock=%s" },
7973c1f1 185
bf0fd768
CL		 186 { Opt_err, NULL }
187};
188
189enum {
ee671b01 190 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 191
192 Opt_xprt_err
193};
194
a447c093 195static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 196 { Opt_xprt_udp, "udp" },
ee671b01 197 { Opt_xprt_udp6, "udp6" },
bf0fd768 198 { Opt_xprt_tcp, "tcp" },
ee671b01 199 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 200 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 201
202 { Opt_xprt_err, NULL }
203};
204
205enum {
206 Opt_sec_none, Opt_sec_sys,
207 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
208 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
209 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
210
211 Opt_sec_err
212};
213
a447c093 214static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 215 { Opt_sec_none, "none" },
216 { Opt_sec_none, "null" },
217 { Opt_sec_sys, "sys" },
218
219 { Opt_sec_krb5, "krb5" },
220 { Opt_sec_krb5i, "krb5i" },
221 { Opt_sec_krb5p, "krb5p" },
222
223 { Opt_sec_lkey, "lkey" },
224 { Opt_sec_lkeyi, "lkeyi" },
225 { Opt_sec_lkeyp, "lkeyp" },
226
8d042218
OK		 227 { Opt_sec_spkm, "spkm3" },
228 { Opt_sec_spkmi, "spkm3i" },
229 { Opt_sec_spkmp, "spkm3p" },
230
bf0fd768
CL		 231 { Opt_sec_err, NULL }
232};
233
7973c1f1
TM		 234enum {
235 Opt_lookupcache_all, Opt_lookupcache_positive,
236 Opt_lookupcache_none,
237
238 Opt_lookupcache_err
239};
240
241static match_table_t nfs_lookupcache_tokens = {
242 { Opt_lookupcache_all, "all" },
243 { Opt_lookupcache_positive, "pos" },
244 { Opt_lookupcache_positive, "positive" },
245 { Opt_lookupcache_none, "none" },
246
247 { Opt_lookupcache_err, NULL }
248};
249
5eebde23
SJ		 250enum {
251 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
252 Opt_local_lock_none,
253
254 Opt_local_lock_err
255};
256
257static match_table_t nfs_local_lock_tokens = {
258 { Opt_local_lock_all, "all" },
259 { Opt_local_lock_flock, "flock" },
260 { Opt_local_lock_posix, "posix" },
261 { Opt_local_lock_none, "none" },
262
263 { Opt_local_lock_err, NULL }
264};
265
0d71b058
TM		 266enum {
267 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
268 Opt_vers_4_1,
269
270 Opt_vers_err
271};
272
273static match_table_t nfs_vers_tokens = {
274 { Opt_vers_2, "2" },
275 { Opt_vers_3, "3" },
276 { Opt_vers_4, "4" },
277 { Opt_vers_4_0, "4.0" },
278 { Opt_vers_4_1, "4.1" },
279
280 { Opt_vers_err, NULL }
281};
bf0fd768 282
42faad99 283static void nfs_umount_begin(struct super_block *);
816724e6 284static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 285static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 286static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 287static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 288static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 289static struct dentry *nfs_fs_mount(struct file_system_type *,
290 int, const char *, void *);
31f43471
AV		 291static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
292 int flags, const char *dev_name, void *raw_data);
387c149b 293static void nfs_put_super(struct super_block *);
f7b422b1 294static void nfs_kill_super(struct super_block *);
48b605f8 295static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 296
297static struct file_system_type nfs_fs_type = {
298 .owner = THIS_MODULE,
299 .name = "nfs",
01194981 300 .mount = nfs_fs_mount,
f7b422b1 301 .kill_sb = nfs_kill_super,
349457cc 302 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 303};
304
54ceac45 305struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 306 .owner = THIS_MODULE,
307 .name = "nfs",
31f43471 308 .mount = nfs_xdev_mount,
f7b422b1 309 .kill_sb = nfs_kill_super,
349457cc 310 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 311};
312
ee9b6d61 313static const struct super_operations nfs_sops = {
f7b422b1
DH		 314 .alloc_inode = nfs_alloc_inode,
315 .destroy_inode = nfs_destroy_inode,
316 .write_inode = nfs_write_inode,
387c149b 317 .put_super = nfs_put_super,
f7b422b1 318 .statfs = nfs_statfs,
b57922d9 319 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 320 .umount_begin = nfs_umount_begin,
321 .show_options = nfs_show_options,
c7f404b4
AV		 322 .show_devname = nfs_show_devname,
323 .show_path = nfs_show_path,
f7b422b1 324 .show_stats = nfs_show_stats,
48b605f8 325 .remount_fs = nfs_remount,
f7b422b1
DH		 326};
327
328#ifdef CONFIG_NFS_V4
7630c852
CL		 329static int nfs4_validate_text_mount_data(void *options,
330 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 331static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
332 struct nfs_parsed_mount_data *data);
333static struct dentry *nfs4_mount(struct file_system_type *fs_type,
334 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 335static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
336 int flags, const char *dev_name, void *raw_data);
337static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
338 int flags, const char *dev_name, void *raw_data);
01194981
AV		 339static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
340 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 341static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
342 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 343static void nfs4_kill_super(struct super_block *sb);
344
345static struct file_system_type nfs4_fs_type = {
346 .owner = THIS_MODULE,
347 .name = "nfs4",
01194981 348 .mount = nfs4_mount,
f7b422b1 349 .kill_sb = nfs4_kill_super,
349457cc 350 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 351};
352
c02d7adf
TM		 353static struct file_system_type nfs4_remote_fs_type = {
354 .owner = THIS_MODULE,
355 .name = "nfs4",
31f43471 356 .mount = nfs4_remote_mount,
c02d7adf
TM		 357 .kill_sb = nfs4_kill_super,
358 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
359};
360
54ceac45 361struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 362 .owner = THIS_MODULE,
363 .name = "nfs4",
31f43471 364 .mount = nfs4_xdev_mount,
f7b422b1 365 .kill_sb = nfs4_kill_super,
349457cc 366 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 367};
368
c02d7adf
TM		 369static struct file_system_type nfs4_remote_referral_fs_type = {
370 .owner = THIS_MODULE,
371 .name = "nfs4",
31f43471 372 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 373 .kill_sb = nfs4_kill_super,
374 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
375};
376
54ceac45 377struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 378 .owner = THIS_MODULE,
379 .name = "nfs4",
01194981 380 .mount = nfs4_referral_mount,
f7b422b1 381 .kill_sb = nfs4_kill_super,
349457cc 382 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 383};
384
ee9b6d61 385static const struct super_operations nfs4_sops = {
f7b422b1
DH		 386 .alloc_inode = nfs_alloc_inode,
387 .destroy_inode = nfs_destroy_inode,
388 .write_inode = nfs_write_inode,
387c149b 389 .put_super = nfs_put_super,
f7b422b1 390 .statfs = nfs_statfs,
b57922d9 391 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 392 .umount_begin = nfs_umount_begin,
393 .show_options = nfs_show_options,
c7f404b4
AV		 394 .show_devname = nfs_show_devname,
395 .show_path = nfs_show_path,
f7b422b1 396 .show_stats = nfs_show_stats,
48b605f8 397 .remount_fs = nfs_remount,
f7b422b1
DH		 398};
399#endif
400
8e1f936b
RR		 401static struct shrinker acl_shrinker = {
402 .shrink = nfs_access_cache_shrinker,
403 .seeks = DEFAULT_SEEKS,
404};
979df72e 405
f7b422b1
DH		 406/*
407 * Register the NFS filesystems
408 */
409int __init register_nfs_fs(void)
410{
411 int ret;
412
413 ret = register_filesystem(&nfs_fs_type);
414 if (ret < 0)
415 goto error_0;
416
f7b422b1
DH		 417 ret = nfs_register_sysctl();
418 if (ret < 0)
419 goto error_1;
89a09141 420#ifdef CONFIG_NFS_V4
f7b422b1
DH		 421 ret = register_filesystem(&nfs4_fs_type);
422 if (ret < 0)
423 goto error_2;
424#endif
8e1f936b 425 register_shrinker(&acl_shrinker);
f7b422b1
DH		 426 return 0;
427
428#ifdef CONFIG_NFS_V4
429error_2:
430 nfs_unregister_sysctl();
89a09141 431#endif
f7b422b1
DH		 432error_1:
433 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 434error_0:
435 return ret;
436}
437
438/*
439 * Unregister the NFS filesystems
440 */
441void __exit unregister_nfs_fs(void)
442{
8e1f936b 443 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 444#ifdef CONFIG_NFS_V4
445 unregister_filesystem(&nfs4_fs_type);
f7b422b1 446#endif
49af7ee1 447 nfs_unregister_sysctl();
f7b422b1
DH		 448 unregister_filesystem(&nfs_fs_type);
449}
450
1daef0a8 451void nfs_sb_active(struct super_block *sb)
ef818a28 452{
1daef0a8 453 struct nfs_server *server = NFS_SB(sb);
ef818a28 454
1daef0a8
TM		 455 if (atomic_inc_return(&server->active) == 1)
456 atomic_inc(&sb->s_active);
ef818a28
SD		 457}
458
1daef0a8 459void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 460{
461 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 462
463 if (atomic_dec_and_test(&server->active))
464 deactivate_super(sb);
ef818a28
SD		 465}
466
f7b422b1
DH		 467/*
468 * Deliver file system statistics to userspace
469 */
816724e6 470static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 471{
0c7d90cf 472 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 473 unsigned char blockbits;
474 unsigned long blockres;
0c7d90cf 475 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 476 struct nfs_fsstat res;
477 int error = -ENOMEM;
478
479 res.fattr = nfs_alloc_fattr();
480 if (res.fattr == NULL)
481 goto out_err;
f7b422b1 482
8fa5c000 483 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 484 if (unlikely(error == -ESTALE)) {
485 struct dentry *pd_dentry;
486
487 pd_dentry = dget_parent(dentry);
488 if (pd_dentry != NULL) {
489 nfs_zap_caches(pd_dentry->d_inode);
490 dput(pd_dentry);
491 }
492 }
ca7e9a0d 493 nfs_free_fattr(res.fattr);
f7b422b1
DH		 494 if (error < 0)
495 goto out_err;
ca7e9a0d 496
1a0ba9ae 497 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 498
499 /*
500 * Current versions of glibc do not correctly handle the
501 * case where f_frsize != f_bsize. Eventually we want to
502 * report the value of wtmult in this field.
503 */
0c7d90cf 504 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 505
506 /*
507 * On most *nix systems, f_blocks, f_bfree, and f_bavail
508 * are reported in units of f_frsize. Linux hasn't had
509 * an f_frsize field in its statfs struct until recently,
510 * thus historically Linux's sys_statfs reports these
511 * fields in units of f_bsize.
512 */
0c7d90cf
DH		 513 buf->f_bsize = dentry->d_sb->s_blocksize;
514 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 515 blockres = (1 << blockbits) - 1;
516 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
517 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
518 buf->f_bavail = (res.abytes + blockres) >> blockbits;
519
520 buf->f_files = res.tfiles;
521 buf->f_ffree = res.afiles;
522
523 buf->f_namelen = server->namelen;
1a0ba9ae 524
f7b422b1
DH		 525 return 0;
526
527 out_err:
3110ff80 528 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 529 return error;
f7b422b1
DH		 530}
531
7d4e2747
DH		 532/*
533 * Map the security flavour number to a name
534 */
81039f1f
TM		 535static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
536{
7d4e2747 537 static const struct {
81039f1f
TM		 538 rpc_authflavor_t flavour;
539 const char *str;
540 } sec_flavours[] = {
541 { RPC_AUTH_NULL, "null" },
542 { RPC_AUTH_UNIX, "sys" },
543 { RPC_AUTH_GSS_KRB5, "krb5" },
544 { RPC_AUTH_GSS_KRB5I, "krb5i" },
545 { RPC_AUTH_GSS_KRB5P, "krb5p" },
546 { RPC_AUTH_GSS_LKEY, "lkey" },
547 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
548 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
549 { RPC_AUTH_GSS_SPKM, "spkm" },
550 { RPC_AUTH_GSS_SPKMI, "spkmi" },
551 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 552 { UINT_MAX, "unknown" }
81039f1f
TM		 553 };
554 int i;
555
4d81cd16 556 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 557 if (sec_flavours[i].flavour == flavour)
558 break;
559 }
560 return sec_flavours[i].str;
561}
562
ee671b01
JL		 563static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
564 int showdefaults)
565{
566 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
567
568 seq_printf(m, ",mountproto=");
569 switch (sap->sa_family) {
570 case AF_INET:
571 switch (nfss->mountd_protocol) {
572 case IPPROTO_UDP:
573 seq_printf(m, RPCBIND_NETID_UDP);
574 break;
575 case IPPROTO_TCP:
576 seq_printf(m, RPCBIND_NETID_TCP);
577 break;
578 default:
579 if (showdefaults)
580 seq_printf(m, "auto");
581 }
582 break;
583 case AF_INET6:
584 switch (nfss->mountd_protocol) {
585 case IPPROTO_UDP:
586 seq_printf(m, RPCBIND_NETID_UDP6);
587 break;
588 case IPPROTO_TCP:
589 seq_printf(m, RPCBIND_NETID_TCP6);
590 break;
591 default:
592 if (showdefaults)
593 seq_printf(m, "auto");
594 }
595 break;
596 default:
597 if (showdefaults)
598 seq_printf(m, "auto");
599 }
600}
601
82d101d5
CL		 602static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
603 int showdefaults)
604{
605 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
606
d5eff1a3
BS		 607 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
608 return;
609
82d101d5
CL		 610 switch (sap->sa_family) {
611 case AF_INET: {
612 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 613 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 614 break;
615 }
616 case AF_INET6: {
617 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 618 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 619 break;
620 }
621 default:
622 if (showdefaults)
623 seq_printf(m, ",mountaddr=unspecified");
624 }
625
626 if (nfss->mountd_version || showdefaults)
627 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 628 if ((nfss->mountd_port &&
629 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
630 showdefaults)
82d101d5
CL		 631 seq_printf(m, ",mountport=%u", nfss->mountd_port);
632
ee671b01 633 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 634}
635
0be8189f
TM		 636#ifdef CONFIG_NFS_V4
637static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
638 int showdefaults)
639{
640 struct nfs_client *clp = nfss->nfs_client;
641
642 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
643 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
644}
645#else
646static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
647 int showdefaults)
648{
649}
650#endif
651
f7b422b1
DH		 652/*
653 * Describe the mount options in force on this server representation
654 */
82d101d5
CL		 655static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
656 int showdefaults)
f7b422b1 657{
509de811 658 static const struct proc_nfs_info {
f7b422b1 659 int flag;
509de811
DH		 660 const char *str;
661 const char *nostr;
f7b422b1
DH		 662 } nfs_info[] = {
663 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 664 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 665 { NFS_MOUNT_NOCTO, ",nocto", "" },
666 { NFS_MOUNT_NOAC, ",noac", "" },
667 { NFS_MOUNT_NONLM, ",nolock", "" },
668 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 669 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 670 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
671 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 672 { 0, NULL, NULL }
673 };
509de811 674 const struct proc_nfs_info *nfs_infop;
8fa5c000 675 struct nfs_client *clp = nfss->nfs_client;
82d101d5 676 u32 version = clp->rpc_ops->version;
7c563cc9 677 int local_flock, local_fcntl;
f7b422b1 678
82d101d5 679 seq_printf(m, ",vers=%u", version);
2d767432
CL		 680 seq_printf(m, ",rsize=%u", nfss->rsize);
681 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 682 if (nfss->bsize != 0)
683 seq_printf(m, ",bsize=%u", nfss->bsize);
684 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 685 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 686 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 687 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 688 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 689 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 690 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 691 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 692 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 693 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
694 if (nfss->flags & nfs_infop->flag)
695 seq_puts(m, nfs_infop->str);
696 else
697 seq_puts(m, nfs_infop->nostr);
698 }
56928edd 699 seq_printf(m, ",proto=%s",
ee671b01 700 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 701 if (version == 4) {
702 if (nfss->port != NFS_PORT)
703 seq_printf(m, ",port=%u", nfss->port);
704 } else
705 if (nfss->port)
706 seq_printf(m, ",port=%u", nfss->port);
707
33170233
TM		 708 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
709 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 710 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 711
712 if (version != 4)
713 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 714 else
715 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 716
b797cac7
DH		 717 if (nfss->options & NFS_OPTION_FSCACHE)
718 seq_printf(m, ",fsc");
9b00c643
PL		 719
720 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
721 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
722 seq_printf(m, ",lookupcache=none");
723 else
724 seq_printf(m, ",lookupcache=pos");
725 }
7c563cc9
SJ		 726
727 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
728 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
729
730 if (!local_flock && !local_fcntl)
731 seq_printf(m, ",local_lock=none");
732 else if (local_flock && local_fcntl)
733 seq_printf(m, ",local_lock=all");
734 else if (local_flock)
735 seq_printf(m, ",local_lock=flock");
736 else
737 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 738}
739
740/*
741 * Describe the mount options on this VFS mountpoint
742 */
34c80b1d 743static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 744{
34c80b1d 745 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 746
747 nfs_show_mount_options(m, nfss, 0);
748
5d8515ca
CL		 749 seq_printf(m, ",addr=%s",
750 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
751 RPC_DISPLAY_ADDR));
f7b422b1
DH		 752
753 return 0;
754}
45402c38
HS		 755
756#ifdef CONFIG_NFS_V4
ae50c0b5 757#ifdef CONFIG_NFS_V4_1
45402c38 758static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 759{
760 if (nfs4_has_session(server->nfs_client))
761 seq_printf(m, ",sessions");
762}
763#else
45402c38
HS		 764static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
765#endif
ae50c0b5
BF		 766#endif
767
45402c38 768#ifdef CONFIG_NFS_V4
ae50c0b5 769#ifdef CONFIG_NFS_V4_1
45402c38 770static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 771{
772 seq_printf(m, ",pnfs=");
773 if (server->pnfs_curr_ld)
774 seq_printf(m, "%s", server->pnfs_curr_ld->name);
775 else
776 seq_printf(m, "not configured");
777}
45402c38
HS		 778#else
779static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
780#endif
781#endif
f7b422b1 782
d861c630 783static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 784{
785 char *page = (char *) __get_free_page(GFP_KERNEL);
786 char *devname, *dummy;
787 int err = 0;
788 if (!page)
789 return -ENOMEM;
d861c630 790 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 791 if (IS_ERR(devname))
792 err = PTR_ERR(devname);
793 else
794 seq_escape(m, devname, " \t\n\\");
795 free_page((unsigned long)page);
796 return err;
797}
798
a6322de6 799static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 800{
801 seq_puts(m, "/");
802 return 0;
803}
804
f7b422b1
DH		 805/*
806 * Present statistical information for this VFS mountpoint
807 */
64132379 808static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 809{
810 int i, cpu;
64132379 811 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 812 struct rpc_auth *auth = nfss->client->cl_auth;
813 struct nfs_iostats totals = { };
814
815 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
816
817 /*
818 * Display all mount option settings
819 */
820 seq_printf(m, "\n\topts:\t");
64132379
AV		 821 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
822 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
823 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
824 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 825 nfs_show_mount_options(m, nfss, 1);
826
827 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
828
7d2ed9ac
WAA		 829 if (nfss->nfs_client && nfss->nfs_client->impl_id) {
830 struct nfs41_impl_id *impl_id = nfss->nfs_client->impl_id;
831 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
832 "date='%llu,%u'",
833 impl_id->name, impl_id->domain,
834 impl_id->date.seconds, impl_id->date.nseconds);
835 }
836
f7b422b1
DH		 837 seq_printf(m, "\n\tcaps:\t");
838 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 839 seq_printf(m, ",wtmult=%u", nfss->wtmult);
840 seq_printf(m, ",dtsize=%u", nfss->dtsize);
841 seq_printf(m, ",bsize=%u", nfss->bsize);
842 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 843
844#ifdef CONFIG_NFS_V4
40c55319 845 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 846 seq_printf(m, "\n\tnfsv4:\t");
847 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
848 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
849 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 850 show_sessions(m, nfss);
851 show_pnfs(m, nfss);
f7b422b1
DH		 852 }
853#endif
854
855 /*
856 * Display security flavor in effect for this mount
857 */
2d767432 858 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 859 if (auth->au_flavor)
2d767432 860 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 861
862 /*
863 * Display superblock I/O counters
864 */
865 for_each_possible_cpu(cpu) {
866 struct nfs_iostats *stats;
867
868 preempt_disable();
869 stats = per_cpu_ptr(nfss->io_stats, cpu);
870
871 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
872 totals.events[i] += stats->events[i];
873 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
874 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 875#ifdef CONFIG_NFS_FSCACHE
876 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
877 totals.fscache[i] += stats->fscache[i];
878#endif
f7b422b1
DH		 879
880 preempt_enable();
881 }
882
883 seq_printf(m, "\n\tevents:\t");
884 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
885 seq_printf(m, "%lu ", totals.events[i]);
886 seq_printf(m, "\n\tbytes:\t");
887 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
888 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 889#ifdef CONFIG_NFS_FSCACHE
890 if (nfss->options & NFS_OPTION_FSCACHE) {
891 seq_printf(m, "\n\tfsc:\t");
892 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
893 seq_printf(m, "%Lu ", totals.bytes[i]);
894 }
895#endif
f7b422b1
DH		 896 seq_printf(m, "\n");
897
898 rpc_print_iostats(m, nfss->client);
899
900 return 0;
901}
902
903/*
904 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 905 * in response to xdev traversals and referrals
f7b422b1 906 */
42faad99 907static void nfs_umount_begin(struct super_block *sb)
f7b422b1 908{
67e55205 909 struct nfs_server *server;
fc6ae3cf
TM		 910 struct rpc_clnt *rpc;
911
67e55205 912 server = NFS_SB(sb);
fc6ae3cf
TM		 913 /* -EIO all pending I/O */
914 rpc = server->client_acl;
915 if (!IS_ERR(rpc))
916 rpc_killall_tasks(rpc);
917 rpc = server->client;
918 if (!IS_ERR(rpc))
919 rpc_killall_tasks(rpc);
f7b422b1
DH		 920}
921
c5811dbd 922static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 923{
924 struct nfs_parsed_mount_data *data;
925
926 data = kzalloc(sizeof(*data), GFP_KERNEL);
927 if (data) {
9423a08a
CL		 928 data->acregmin = NFS_DEF_ACREGMIN;
929 data->acregmax = NFS_DEF_ACREGMAX;
930 data->acdirmin = NFS_DEF_ACDIRMIN;
931 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 932 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 933 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 934 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 935 data->auth_flavors[0] = RPC_AUTH_UNIX;
936 data->auth_flavor_len = 1;
c5811dbd 937 data->version = version;
9423a08a 938 data->minorversion = 0;
9937347a 939 data->net = current->nsproxy->net_ns;
8a0d551a 940 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 941 }
942 return data;
943}
944
8a0d551a
JL		 945static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
946{
947 if (data) {
948 kfree(data->client_address);
949 kfree(data->mount_server.hostname);
950 kfree(data->nfs_server.export_path);
951 kfree(data->nfs_server.hostname);
952 kfree(data->fscache_uniq);
953 security_free_mnt_opts(&data->lsm_opts);
954 kfree(data);
955 }
956}
957
fc50d58f 958/*
cdcd7f9a
CL		 959 * Sanity-check a server address provided by the mount command.
960 *
961 * Address family must be initialized, and address must not be
962 * the ANY address for that family.
fc50d58f
CL		 963 */
964static int nfs_verify_server_address(struct sockaddr *addr)
965{
966 switch (addr->sa_family) {
967 case AF_INET: {
cdcd7f9a 968 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 969 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 970 }
971 case AF_INET6: {
972 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
973 return !ipv6_addr_any(sa);
fc50d58f
CL		 974 }
975 }
976
53a0b9c4 977 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 978 return 0;
979}
980
4cfd74fc
CL		 981/*
982 * Select between a default port value and a user-specified port value.
983 * If a zero value is set, then autobind will be used.
984 */
f5855fec 985static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 986 const unsigned short default_port)
987{
f5855fec
TM		 988 if (*port == NFS_UNSPEC_PORT)
989 *port = default_port;
4cfd74fc 990
f5855fec 991 rpc_set_port(sap, *port);
4cfd74fc
CL		 992}
993
259875ef
TM		 994/*
995 * Sanity check the NFS transport protocol.
996 *
997 */
998static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
999{
1000 switch (mnt->nfs_server.protocol) {
1001 case XPRT_TRANSPORT_UDP:
1002 case XPRT_TRANSPORT_TCP:
1003 case XPRT_TRANSPORT_RDMA:
1004 break;
1005 default:
1006 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1007 }
1008}
1009
1010/*
1011 * For text based NFSv2/v3 mounts, the mount protocol transport default
1012 * settings should depend upon the specified NFS transport.
1013 */
1014static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1015{
1016 nfs_validate_transport_protocol(mnt);
1017
1018 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1019 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1020 return;
1021 switch (mnt->nfs_server.protocol) {
1022 case XPRT_TRANSPORT_UDP:
1023 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1024 break;
1025 case XPRT_TRANSPORT_TCP:
1026 case XPRT_TRANSPORT_RDMA:
1027 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1028 }
1029}
1030
01060c89
CL		 1031/*
1032 * Parse the value of the 'sec=' option.
01060c89
CL		 1033 */
1034static int nfs_parse_security_flavors(char *value,
1035 struct nfs_parsed_mount_data *mnt)
1036{
1037 substring_t args[MAX_OPT_ARGS];
1038
1039 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1040
1041 switch (match_token(value, nfs_secflavor_tokens, args)) {
1042 case Opt_sec_none:
01060c89
CL		 1043 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1044 break;
1045 case Opt_sec_sys:
01060c89
CL		 1046 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1047 break;
1048 case Opt_sec_krb5:
01060c89
CL		 1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1050 break;
1051 case Opt_sec_krb5i:
01060c89
CL		 1052 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1053 break;
1054 case Opt_sec_krb5p:
01060c89
CL		 1055 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1056 break;
1057 case Opt_sec_lkey:
01060c89
CL		 1058 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1059 break;
1060 case Opt_sec_lkeyi:
01060c89
CL		 1061 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1062 break;
1063 case Opt_sec_lkeyp:
01060c89
CL		 1064 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1065 break;
1066 case Opt_sec_spkm:
01060c89
CL		 1067 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1068 break;
1069 case Opt_sec_spkmi:
01060c89
CL		 1070 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1071 break;
1072 case Opt_sec_spkmp:
01060c89
CL		 1073 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1074 break;
1075 default:
1076 return 0;
1077 }
1078
9b7160c5 1079 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1080 mnt->auth_flavor_len = 1;
01060c89
CL		 1081 return 1;
1082}
1083
0d71b058
TM		 1084static int nfs_parse_version_string(char *string,
1085 struct nfs_parsed_mount_data *mnt,
1086 substring_t *args)
1087{
1088 mnt->flags &= ~NFS_MOUNT_VER3;
1089 switch (match_token(string, nfs_vers_tokens, args)) {
1090 case Opt_vers_2:
1091 mnt->version = 2;
1092 break;
1093 case Opt_vers_3:
1094 mnt->flags |= NFS_MOUNT_VER3;
1095 mnt->version = 3;
1096 break;
1097 case Opt_vers_4:
1098 /* Backward compatibility option. In future,
1099 * the mount program should always supply
1100 * a NFSv4 minor version number.
1101 */
1102 mnt->version = 4;
1103 break;
1104 case Opt_vers_4_0:
1105 mnt->version = 4;
1106 mnt->minorversion = 0;
1107 break;
1108 case Opt_vers_4_1:
1109 mnt->version = 4;
1110 mnt->minorversion = 1;
1111 break;
1112 default:
1113 return 0;
1114 }
1115 return 1;
1116}
1117
c5cb09b6
RL		 1118static int nfs_get_option_str(substring_t args[], char **option)
1119{
1120 kfree(*option);
1121 *option = match_strdup(args);
1122 return !option;
1123}
1124
1125static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1126{
1127 int rc;
1128 char *string;
1129
1130 string = match_strdup(args);
1131 if (string == NULL)
1132 return -ENOMEM;
1133 rc = strict_strtoul(string, 10, option);
1134 kfree(string);
1135
1136 return rc;
1137}
1138
bf0fd768
CL		 1139/*
1140 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1141 * a data structure. The whole mount string is processed; bad options are
1142 * skipped as they are encountered. If there were no errors, return 1;
1143 * otherwise return 0 (zero).
bf0fd768
CL		 1144 */
1145static int nfs_parse_mount_options(char *raw,
1146 struct nfs_parsed_mount_data *mnt)
1147{
f9c3a380 1148 char *p, *string, *secdata;
d23c45fd 1149 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1150 unsigned short protofamily = AF_UNSPEC;
1151 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1152
1153 if (!raw) {
1154 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1155 return 1;
1156 }
1157 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1158
f9c3a380
EP		 1159 secdata = alloc_secdata();
1160 if (!secdata)
1161 goto out_nomem;
1162
1163 rc = security_sb_copy_data(raw, secdata);
1164 if (rc)
1165 goto out_security_failure;
1166
1167 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1168 if (rc)
1169 goto out_security_failure;
1170
1171 free_secdata(secdata);
1172
bf0fd768
CL		 1173 while ((p = strsep(&raw, ",")) != NULL) {
1174 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1175 unsigned long option;
1176 int token;
bf0fd768
CL		 1177
1178 if (!*p)
1179 continue;
1180
1181 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1182
1183 token = match_token(p, nfs_mount_option_tokens, args);
1184 switch (token) {
f45663ce
CL		 1185
1186 /*
1187 * boolean options: foo/nofoo
1188 */
bf0fd768
CL		 1189 case Opt_soft:
1190 mnt->flags |= NFS_MOUNT_SOFT;
1191 break;
1192 case Opt_hard:
1193 mnt->flags &= ~NFS_MOUNT_SOFT;
1194 break;
bf0fd768
CL		 1195 case Opt_posix:
1196 mnt->flags |= NFS_MOUNT_POSIX;
1197 break;
1198 case Opt_noposix:
1199 mnt->flags &= ~NFS_MOUNT_POSIX;
1200 break;
1201 case Opt_cto:
1202 mnt->flags &= ~NFS_MOUNT_NOCTO;
1203 break;
1204 case Opt_nocto:
1205 mnt->flags |= NFS_MOUNT_NOCTO;
1206 break;
1207 case Opt_ac:
1208 mnt->flags &= ~NFS_MOUNT_NOAC;
1209 break;
1210 case Opt_noac:
1211 mnt->flags |= NFS_MOUNT_NOAC;
1212 break;
1213 case Opt_lock:
1214 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1215 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1216 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1217 break;
1218 case Opt_nolock:
1219 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1220 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1221 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1222 break;
1223 case Opt_v2:
1224 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1225 mnt->version = 2;
bf0fd768
CL		 1226 break;
1227 case Opt_v3:
1228 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1229 mnt->version = 3;
bf0fd768 1230 break;
764302cc
CL		 1231 case Opt_v4:
1232 mnt->flags &= ~NFS_MOUNT_VER3;
1233 mnt->version = 4;
1234 break;
7ced286e
WAA		 1235 case Opt_v4_0:
1236 mnt->flags &= ~NFS_MOUNT_VER3;
1237 mnt->version = 4;
1238 mnt->minorversion = 0;
1239 break;
1240 case Opt_v4_1:
1241 mnt->flags &= ~NFS_MOUNT_VER3;
1242 mnt->version = 4;
1243 mnt->minorversion = 1;
1244 break;
bf0fd768
CL		 1245 case Opt_udp:
1246 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1247 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1248 break;
1249 case Opt_tcp:
1250 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1251 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1252 break;
2cf7ff7a
TT		 1253 case Opt_rdma:
1254 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1255 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1256 xprt_load_transport(p);
2cf7ff7a 1257 break;
bf0fd768
CL		 1258 case Opt_acl:
1259 mnt->flags &= ~NFS_MOUNT_NOACL;
1260 break;
1261 case Opt_noacl:
1262 mnt->flags |= NFS_MOUNT_NOACL;
1263 break;
1264 case Opt_rdirplus:
1265 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1266 break;
1267 case Opt_nordirplus:
1268 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1269 break;
75180df2
TM		 1270 case Opt_sharecache:
1271 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1272 break;
1273 case Opt_nosharecache:
1274 mnt->flags |= NFS_MOUNT_UNSHARED;
1275 break;
d740351b
CL		 1276 case Opt_resvport:
1277 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1278 break;
1279 case Opt_noresvport:
1280 mnt->flags |= NFS_MOUNT_NORESVPORT;
1281 break;
b797cac7
DH		 1282 case Opt_fscache:
1283 mnt->options |= NFS_OPTION_FSCACHE;
1284 kfree(mnt->fscache_uniq);
1285 mnt->fscache_uniq = NULL;
1286 break;
1287 case Opt_nofscache:
1288 mnt->options &= ~NFS_OPTION_FSCACHE;
1289 kfree(mnt->fscache_uniq);
1290 mnt->fscache_uniq = NULL;
1291 break;
bf0fd768 1292
f45663ce
CL		 1293 /*
1294 * options that take numeric values
1295 */
bf0fd768 1296 case Opt_port:
c5cb09b6
RL		 1297 if (nfs_get_option_ul(args, &option) ||
1298 option > USHRT_MAX)
d23c45fd
CL		 1299 goto out_invalid_value;
1300 mnt->nfs_server.port = option;
bf0fd768
CL		 1301 break;
1302 case Opt_rsize:
c5cb09b6 1303 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1304 goto out_invalid_value;
1305 mnt->rsize = option;
bf0fd768
CL		 1306 break;
1307 case Opt_wsize:
c5cb09b6 1308 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1309 goto out_invalid_value;
1310 mnt->wsize = option;
bf0fd768
CL		 1311 break;
1312 case Opt_bsize:
c5cb09b6 1313 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1314 goto out_invalid_value;
1315 mnt->bsize = option;
bf0fd768
CL		 1316 break;
1317 case Opt_timeo:
c5cb09b6 1318 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1319 goto out_invalid_value;
1320 mnt->timeo = option;
bf0fd768
CL		 1321 break;
1322 case Opt_retrans:
c5cb09b6 1323 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1324 goto out_invalid_value;
1325 mnt->retrans = option;
bf0fd768
CL		 1326 break;
1327 case Opt_acregmin:
c5cb09b6 1328 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1329 goto out_invalid_value;
1330 mnt->acregmin = option;
bf0fd768
CL		 1331 break;
1332 case Opt_acregmax:
c5cb09b6 1333 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1334 goto out_invalid_value;
1335 mnt->acregmax = option;
bf0fd768
CL		 1336 break;
1337 case Opt_acdirmin:
c5cb09b6 1338 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1339 goto out_invalid_value;
1340 mnt->acdirmin = option;
bf0fd768
CL		 1341 break;
1342 case Opt_acdirmax:
c5cb09b6 1343 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1344 goto out_invalid_value;
1345 mnt->acdirmax = option;
bf0fd768
CL		 1346 break;
1347 case Opt_actimeo:
c5cb09b6 1348 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1349 goto out_invalid_value;
1350 mnt->acregmin = mnt->acregmax =
1351 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1352 break;
1353 case Opt_namelen:
c5cb09b6 1354 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1355 goto out_invalid_value;
1356 mnt->namlen = option;
bf0fd768
CL		 1357 break;
1358 case Opt_mountport:
c5cb09b6
RL		 1359 if (nfs_get_option_ul(args, &option) ||
1360 option > USHRT_MAX)
d23c45fd
CL		 1361 goto out_invalid_value;
1362 mnt->mount_server.port = option;
bf0fd768 1363 break;
bf0fd768 1364 case Opt_mountvers:
c5cb09b6 1365 if (nfs_get_option_ul(args, &option) ||
f45663ce 1366 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1367 option > NFS_MNT3_VERSION)
1368 goto out_invalid_value;
1369 mnt->mount_server.version = option;
bf0fd768 1370 break;
3fd5be9e 1371 case Opt_minorversion:
c5cb09b6 1372 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1373 goto out_invalid_value;
1374 if (option > NFS4_MAX_MINOR_VERSION)
1375 goto out_invalid_value;
1376 mnt->minorversion = option;
3fd5be9e 1377 break;
bf0fd768 1378
f45663ce
CL		 1379 /*
1380 * options that take text values
1381 */
0d71b058
TM		 1382 case Opt_nfsvers:
1383 string = match_strdup(args);
1384 if (string == NULL)
1385 goto out_nomem;
1386 rc = nfs_parse_version_string(string, mnt, args);
1387 kfree(string);
1388 if (!rc)
1389 goto out_invalid_value;
1390 break;
bf0fd768
CL		 1391 case Opt_sec:
1392 string = match_strdup(args);
1393 if (string == NULL)
1394 goto out_nomem;
01060c89 1395 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1396 kfree(string);
f45663ce 1397 if (!rc) {
f45663ce
CL		 1398 dfprintk(MOUNT, "NFS: unrecognized "
1399 "security flavor\n");
d23c45fd 1400 return 0;
f45663ce 1401 }
bf0fd768
CL		 1402 break;
1403 case Opt_proto:
1404 string = match_strdup(args);
1405 if (string == NULL)
1406 goto out_nomem;
1407 token = match_token(string,
1408 nfs_xprt_protocol_tokens, args);
bf0fd768 1409
ee671b01 1410 protofamily = AF_INET;
bf0fd768 1411 switch (token) {
ee671b01
JL		 1412 case Opt_xprt_udp6:
1413 protofamily = AF_INET6;
fdb66ff4 1414 case Opt_xprt_udp:
bf0fd768 1415 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1416 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1417 break;
ee671b01
JL		 1418 case Opt_xprt_tcp6:
1419 protofamily = AF_INET6;
fdb66ff4 1420 case Opt_xprt_tcp:
bf0fd768 1421 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1422 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1423 break;
2cf7ff7a
TT		 1424 case Opt_xprt_rdma:
1425 /* vector side protocols to TCP */
1426 mnt->flags |= NFS_MOUNT_TCP;
1427 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1428 xprt_load_transport(string);
2cf7ff7a 1429 break;
bf0fd768 1430 default:
f45663ce
CL		 1431 dfprintk(MOUNT, "NFS: unrecognized "
1432 "transport protocol\n");
4223a4a1 1433 kfree(string);
d23c45fd 1434 return 0;
bf0fd768 1435 }
c5cb09b6 1436 kfree(string);
bf0fd768
CL		 1437 break;
1438 case Opt_mountproto:
1439 string = match_strdup(args);
1440 if (string == NULL)
1441 goto out_nomem;
1442 token = match_token(string,
1443 nfs_xprt_protocol_tokens, args);
d508afb4 1444 kfree(string);
bf0fd768 1445
ee671b01 1446 mountfamily = AF_INET;
bf0fd768 1447 switch (token) {
ee671b01
JL		 1448 case Opt_xprt_udp6:
1449 mountfamily = AF_INET6;
fdb66ff4 1450 case Opt_xprt_udp:
0896a725 1451 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1452 break;
ee671b01
JL		 1453 case Opt_xprt_tcp6:
1454 mountfamily = AF_INET6;
fdb66ff4 1455 case Opt_xprt_tcp:
0896a725 1456 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1457 break;
2cf7ff7a 1458 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1459 default:
f45663ce
CL		 1460 dfprintk(MOUNT, "NFS: unrecognized "
1461 "transport protocol\n");
d23c45fd 1462 return 0;
bf0fd768
CL		 1463 }
1464 break;
1465 case Opt_addr:
1466 string = match_strdup(args);
1467 if (string == NULL)
1468 goto out_nomem;
53a0b9c4 1469 mnt->nfs_server.addrlen =
b48e1278 1470 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1471 (struct sockaddr *)
1472 &mnt->nfs_server.address,
1473 sizeof(mnt->nfs_server.address));
bf0fd768 1474 kfree(string);
53a0b9c4
CL		 1475 if (mnt->nfs_server.addrlen == 0)
1476 goto out_invalid_address;
bf0fd768
CL		 1477 break;
1478 case Opt_clientaddr:
c5cb09b6 1479 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1480 goto out_nomem;
bf0fd768 1481 break;
33832034 1482 case Opt_mounthost:
c5cb09b6
RL		 1483 if (nfs_get_option_str(args,
1484 &mnt->mount_server.hostname))
33832034 1485 goto out_nomem;
33832034 1486 break;
0ac83779 1487 case Opt_mountaddr:
bf0fd768
CL		 1488 string = match_strdup(args);
1489 if (string == NULL)
1490 goto out_nomem;
53a0b9c4 1491 mnt->mount_server.addrlen =
b48e1278 1492 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1493 (struct sockaddr *)
1494 &mnt->mount_server.address,
1495 sizeof(mnt->mount_server.address));
bf0fd768 1496 kfree(string);
53a0b9c4
CL		 1497 if (mnt->mount_server.addrlen == 0)
1498 goto out_invalid_address;
bf0fd768 1499 break;
7973c1f1
TM		 1500 case Opt_lookupcache:
1501 string = match_strdup(args);
1502 if (string == NULL)
1503 goto out_nomem;
1504 token = match_token(string,
1505 nfs_lookupcache_tokens, args);
1506 kfree(string);
1507 switch (token) {
1508 case Opt_lookupcache_all:
1509 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1510 break;
1511 case Opt_lookupcache_positive:
1512 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1513 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1514 break;
1515 case Opt_lookupcache_none:
1516 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1517 break;
1518 default:
7973c1f1
TM		 1519 dfprintk(MOUNT, "NFS: invalid "
1520 "lookupcache argument\n");
d23c45fd 1521 return 0;
7973c1f1
TM		 1522 };
1523 break;
a6d5ff64 1524 case Opt_fscache_uniq:
c5cb09b6 1525 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1526 goto out_nomem;
a6d5ff64
CL		 1527 mnt->options |= NFS_OPTION_FSCACHE;
1528 break;
5eebde23
SJ		 1529 case Opt_local_lock:
1530 string = match_strdup(args);
1531 if (string == NULL)
1532 goto out_nomem;
1533 token = match_token(string, nfs_local_lock_tokens,
1534 args);
1535 kfree(string);
1536 switch (token) {
1537 case Opt_local_lock_all:
1538 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1539 NFS_MOUNT_LOCAL_FCNTL);
1540 break;
1541 case Opt_local_lock_flock:
1542 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1543 break;
1544 case Opt_local_lock_posix:
1545 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1546 break;
1547 case Opt_local_lock_none:
1548 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1549 NFS_MOUNT_LOCAL_FCNTL);
1550 break;
1551 default:
1552 dfprintk(MOUNT, "NFS: invalid "
1553 "local_lock argument\n");
1554 return 0;
1555 };
1556 break;
bf0fd768 1557
f45663ce
CL		 1558 /*
1559 * Special options
1560 */
1561 case Opt_sloppy:
1562 sloppy = 1;
1563 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1564 break;
bf0fd768
CL		 1565 case Opt_userspace:
1566 case Opt_deprecated:
d33e4dfe
CL		 1567 dfprintk(MOUNT, "NFS: ignoring mount option "
1568 "'%s'\n", p);
bf0fd768
CL		 1569 break;
1570
1571 default:
d23c45fd 1572 invalid_option = 1;
f45663ce
CL		 1573 dfprintk(MOUNT, "NFS: unrecognized mount option "
1574 "'%s'\n", p);
bf0fd768
CL		 1575 }
1576 }
1577
d23c45fd
CL		 1578 if (!sloppy && invalid_option)
1579 return 0;
1580
571b7554
WAA		 1581 if (mnt->minorversion && mnt->version != 4)
1582 goto out_minorversion_mismatch;
1583
ee671b01
JL		 1584 /*
1585 * verify that any proto=/mountproto= options match the address
1586 * familiies in the addr=/mountaddr= options.
1587 */
1588 if (protofamily != AF_UNSPEC &&
1589 protofamily != mnt->nfs_server.address.ss_family)
1590 goto out_proto_mismatch;
1591
1592 if (mountfamily != AF_UNSPEC) {
1593 if (mnt->mount_server.addrlen) {
1594 if (mountfamily != mnt->mount_server.address.ss_family)
1595 goto out_mountproto_mismatch;
1596 } else {
1597 if (mountfamily != mnt->nfs_server.address.ss_family)
1598 goto out_mountproto_mismatch;
1599 }
1600 }
1601
bf0fd768
CL		 1602 return 1;
1603
ee671b01
JL		 1604out_mountproto_mismatch:
1605 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1606 "option\n");
1607 return 0;
1608out_proto_mismatch:
1609 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1610 return 0;
53a0b9c4
CL		 1611out_invalid_address:
1612 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1613 return 0;
d23c45fd 1614out_invalid_value:
53a0b9c4 1615 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1616 return 0;
571b7554
WAA		 1617out_minorversion_mismatch:
1618 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1619 "minorversion=%u\n", mnt->version, mnt->minorversion);
1620 return 0;
bf0fd768
CL		 1621out_nomem:
1622 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1623 return 0;
f9c3a380
EP		 1624out_security_failure:
1625 free_secdata(secdata);
1626 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1627 return 0;
bf0fd768
CL		 1628}
1629
ec88f28d
CL		 1630/*
1631 * Match the requested auth flavors with the list returned by
1632 * the server. Returns zero and sets the mount's authentication
1633 * flavor on success; returns -EACCES if server does not support
1634 * the requested flavor.
1635 */
1636static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1637 struct nfs_mount_request *request)
1638{
1639 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1640
5eecfde6
CL		 1641 /*
1642 * Certain releases of Linux's mountd return an empty
1643 * flavor list. To prevent behavioral regression with
1644 * these servers (ie. rejecting mounts that used to
1645 * succeed), revert to pre-2.6.32 behavior (no checking)
1646 * if the returned flavor list is empty.
1647 */
1648 if (server_authlist_len == 0)
1649 return 0;
1650
ec88f28d
CL		 1651 /*
1652 * We avoid sophisticated negotiating here, as there are
1653 * plenty of cases where we can get it wrong, providing
1654 * either too little or too much security.
1655 *
1656 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1657 * flavor listed first. However, some servers list
1658 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1659 * preferred default, in args->auth_flavors[0] if user
1660 * didn't specify sec= mount option.
1661 */
1662 for (i = 0; i < args->auth_flavor_len; i++)
1663 for (j = 0; j < server_authlist_len; j++)
1664 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1665 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1666 request->auth_flavs[j]);
1667 args->auth_flavors[0] = request->auth_flavs[j];
1668 return 0;
1669 }
1670
1671 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1672 nfs_umount(request);
1673 return -EACCES;
1674}
1675
0076d7b7
CL		 1676/*
1677 * Use the remote server's MOUNT service to request the NFS file handle
1678 * corresponding to the provided path.
1679 */
1680static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1681 struct nfs_fh *root_fh)
1682{
ec88f28d
CL		 1683 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1684 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1685 struct nfs_mount_request request = {
1686 .sap = (struct sockaddr *)
1687 &args->mount_server.address,
1688 .dirpath = args->nfs_server.export_path,
1689 .protocol = args->mount_server.protocol,
1690 .fh = root_fh,
50a737f8 1691 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1692 .auth_flav_len = &server_authlist_len,
1693 .auth_flavs = server_authlist,
6d59b8d5 1694 .net = args->net,
c5d120f8 1695 };
4c568017 1696 int status;
0076d7b7
CL		 1697
1698 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1699 switch (args->version) {
1700 default:
1701 args->mount_server.version = NFS_MNT3_VERSION;
1702 break;
1703 case 2:
1704 args->mount_server.version = NFS_MNT_VERSION;
1705 }
0076d7b7 1706 }
c5d120f8 1707 request.version = args->mount_server.version;
0076d7b7 1708
33832034 1709 if (args->mount_server.hostname)
c5d120f8 1710 request.hostname = args->mount_server.hostname;
33832034 1711 else
c5d120f8 1712 request.hostname = args->nfs_server.hostname;
33832034 1713
0076d7b7
CL		 1714 /*
1715 * Construct the mount server's address.
1716 */
4c568017 1717 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1718 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1719 args->nfs_server.addrlen);
1720 args->mount_server.addrlen = args->nfs_server.addrlen;
1721 }
c5d120f8 1722 request.salen = args->mount_server.addrlen;
f5855fec 1723 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1724
1725 /*
1726 * Now ask the mount server to map our export path
1727 * to a file handle.
1728 */
c5d120f8 1729 status = nfs_mount(&request);
ec88f28d
CL		 1730 if (status != 0) {
1731 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1732 request.hostname, status);
1733 return status;
1734 }
0076d7b7 1735
ec88f28d
CL		 1736 /*
1737 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1738 */
1739 if (args->mount_server.version != NFS_MNT3_VERSION)
1740 return 0;
1741 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1742}
1743
c12bacec
RL		 1744/*
1745 * Split "dev_name" into "hostname:export_path".
1746 *
1747 * The leftmost colon demarks the split between the server's hostname
1748 * and the export path. If the hostname starts with a left square
1749 * bracket, then it may contain colons.
1750 *
1751 * Note: caller frees hostname and export path, even on error.
1752 */
1753static int nfs_parse_devname(const char *dev_name,
1754 char **hostname, size_t maxnamlen,
1755 char **export_path, size_t maxpathlen)
dc045898
CL		 1756{
1757 size_t len;
c12bacec 1758 char *end;
dc045898 1759
c12bacec
RL		 1760 /* Is the host name protected with square brakcets? */
1761 if (*dev_name == '[') {
1762 end = strchr(++dev_name, ']');
1763 if (end == NULL || end[1] != ':')
dc045898 1764 goto out_bad_devname;
dc045898 1765
c12bacec
RL		 1766 len = end - dev_name;
1767 end++;
1768 } else {
1769 char *comma;
dc045898 1770
c12bacec
RL		 1771 end = strchr(dev_name, ':');
1772 if (end == NULL)
1773 goto out_bad_devname;
1774 len = end - dev_name;
d1aa0825 1775
c12bacec
RL		 1776 /* kill possible hostname list: not supported */
1777 comma = strchr(dev_name, ',');
1778 if (comma != NULL && comma < end)
1779 *comma = 0;
1780 }
d1aa0825 1781
d1aa0825
CL		 1782 if (len > maxnamlen)
1783 goto out_hostname;
1784
1785 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1786 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1787 if (*hostname == NULL)
1788 goto out_nomem;
c12bacec 1789 len = strlen(++end);
d1aa0825
CL		 1790 if (len > maxpathlen)
1791 goto out_path;
1792 *export_path = kstrndup(end, len, GFP_KERNEL);
1793 if (!*export_path)
1794 goto out_nomem;
1795
c12bacec 1796 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1797 return 0;
1798
1799out_bad_devname:
1800 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1801 return -EINVAL;
1802
1803out_nomem:
1804 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1805 return -ENOMEM;
1806
1807out_hostname:
1808 dfprintk(MOUNT, "NFS: server hostname too long\n");
1809 return -ENAMETOOLONG;
1810
1811out_path:
1812 dfprintk(MOUNT, "NFS: export pathname too long\n");
1813 return -ENAMETOOLONG;
1814}
1815
f7b422b1 1816/*
54ceac45
DH		 1817 * Validate the NFS2/NFS3 mount data
1818 * - fills in the mount root filehandle
136d558c
CL		 1819 *
1820 * For option strings, user space handles the following behaviors:
1821 *
1822 * + DNS: mapping server host name to IP address ("addr=" option)
1823 *
1824 * + failure mode: how to behave if a mount request can't be handled
1825 * immediately ("fg/bg" option)
1826 *
1827 * + retry: how often to retry a mount request ("retry=" option)
1828 *
1829 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1830 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1831 */
2283f8d6
TT		 1832static int nfs_validate_mount_data(void *options,
1833 struct nfs_parsed_mount_data *args,
136d558c
CL		 1834 struct nfs_fh *mntfh,
1835 const char *dev_name)
f7b422b1 1836{
2283f8d6 1837 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1838 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1839
5df36e78
CL		 1840 if (data == NULL)
1841 goto out_no_data;
f7b422b1 1842
54ceac45 1843 switch (data->version) {
5df36e78
CL		 1844 case 1:
1845 data->namlen = 0;
1846 case 2:
1847 data->bsize = 0;
1848 case 3:
1849 if (data->flags & NFS_MOUNT_VER3)
1850 goto out_no_v3;
1851 data->root.size = NFS2_FHSIZE;
1852 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1853 case 4:
1854 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1855 goto out_no_sec;
1856 case 5:
1857 memset(data->context, 0, sizeof(data->context));
1858 case 6:
b7e24457
TM		 1859 if (data->flags & NFS_MOUNT_VER3) {
1860 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1861 goto out_invalid_fh;
5df36e78 1862 mntfh->size = data->root.size;
764302cc
CL		 1863 args->version = 3;
1864 } else {
5df36e78 1865 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1866 args->version = 2;
1867 }
5df36e78 1868
5df36e78
CL		 1869
1870 memcpy(mntfh->data, data->root.data, mntfh->size);
1871 if (mntfh->size < sizeof(mntfh->data))
1872 memset(mntfh->data + mntfh->size, 0,
1873 sizeof(mntfh->data) - mntfh->size);
6e88e061 1874
2283f8d6
TT		 1875 /*
1876 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1877 * can deal with.
1878 */
ff3525a5 1879 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1880 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1881 args->rsize = data->rsize;
1882 args->wsize = data->wsize;
2283f8d6
TT		 1883 args->timeo = data->timeo;
1884 args->retrans = data->retrans;
1885 args->acregmin = data->acregmin;
1886 args->acregmax = data->acregmax;
1887 args->acdirmin = data->acdirmin;
1888 args->acdirmax = data->acdirmax;
4c568017 1889
4cfd74fc 1890 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1891 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1892 if (!nfs_verify_server_address(sap))
4c568017
CL		 1893 goto out_no_address;
1894
2283f8d6 1895 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1896 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1897 /* N.B. caller will free nfs_server.hostname in all cases */
1898 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1899 args->namlen = data->namlen;
1900 args->bsize = data->bsize;
dd07c947
CL		 1901
1902 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1903 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1904 if (!args->nfs_server.hostname)
1905 goto out_nomem;
f9c3a380 1906
5eebde23
SJ		 1907 if (!(data->flags & NFS_MOUNT_NONLM))
1908 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1909 NFS_MOUNT_LOCAL_FCNTL);
1910 else
1911 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1912 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1913 /*
1914 * The legacy version 6 binary mount data from userspace has a
1915 * field used only to transport selinux information into the
1916 * the kernel. To continue to support that functionality we
1917 * have a touch of selinux knowledge here in the NFS code. The
1918 * userspace code converted context=blah to just blah so we are
1919 * converting back to the full string selinux understands.
1920 */
1921 if (data->context[0]){
1922#ifdef CONFIG_SECURITY_SELINUX
1923 int rc;
1924 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1925 if (!opts_str)
1926 return -ENOMEM;
1927 strcpy(opts_str, "context=");
1928 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1929 strcat(opts_str, &data->context[0]);
1930 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1931 kfree(opts_str);
1932 if (rc)
1933 return rc;
1934#else
1935 return -EINVAL;
1936#endif
1937 }
1938
5df36e78 1939 break;
136d558c 1940 default: {
136d558c 1941 int status;
136d558c 1942
2283f8d6
TT		 1943 if (nfs_parse_mount_options((char *)options, args) == 0)
1944 return -EINVAL;
136d558c 1945
4cfd74fc 1946 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1947 goto out_no_address;
1948
764302cc
CL		 1949 if (args->version == 4)
1950#ifdef CONFIG_NFS_V4
1951 return nfs4_validate_text_mount_data(options,
1952 args, dev_name);
1953#else
1954 goto out_v4_not_compiled;
1955#endif
1956
f5855fec 1957 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1958
259875ef
TM		 1959 nfs_set_mount_transport_protocol(args);
1960
dc045898
CL		 1961 status = nfs_parse_devname(dev_name,
1962 &args->nfs_server.hostname,
1963 PAGE_SIZE,
1964 &args->nfs_server.export_path,
1965 NFS_MAXPATHLEN);
1966 if (!status)
1967 status = nfs_try_mount(args, mntfh);
136d558c 1968
dc045898
CL		 1969 kfree(args->nfs_server.export_path);
1970 args->nfs_server.export_path = NULL;
136d558c 1971
136d558c 1972 if (status)
fdc6e2c8 1973 return status;
136d558c 1974
136d558c
CL		 1975 break;
1976 }
f7b422b1 1977 }
54ceac45
DH		 1978
1979#ifndef CONFIG_NFS_V3
8a6e5deb 1980 if (args->version == 3)
5df36e78
CL		 1981 goto out_v3_not_compiled;
1982#endif /* !CONFIG_NFS_V3 */
f7b422b1 1983
5df36e78 1984 return 0;
f7b422b1 1985
5df36e78
CL		 1986out_no_data:
1987 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1988 return -EINVAL;
54ceac45 1989
5df36e78
CL		 1990out_no_v3:
1991 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1992 data->version);
1993 return -EINVAL;
f7b422b1 1994
5df36e78
CL		 1995out_no_sec:
1996 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1997 return -EINVAL;
1998
5df36e78
CL		 1999#ifndef CONFIG_NFS_V3
2000out_v3_not_compiled:
2001 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
2002 return -EPROTONOSUPPORT;
2003#endif /* !CONFIG_NFS_V3 */
2004
764302cc
CL		 2005#ifndef CONFIG_NFS_V4
2006out_v4_not_compiled:
2007 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2008 return -EPROTONOSUPPORT;
2009#endif /* !CONFIG_NFS_V4 */
2010
63649bd7
CG		 2011out_nomem:
2012 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2013 return -ENOMEM;
2014
5df36e78
CL		 2015out_no_address:
2016 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2017 return -EINVAL;
2018
2019out_invalid_fh:
2020 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2021 return -EINVAL;
f7b422b1
DH		 2022}
2023
48b605f8
JL		 2024static int
2025nfs_compare_remount_data(struct nfs_server *nfss,
2026 struct nfs_parsed_mount_data *data)
2027{
2028 if (data->flags != nfss->flags ||
2029 data->rsize != nfss->rsize ||
2030 data->wsize != nfss->wsize ||
2031 data->retrans != nfss->client->cl_timeout->to_retries ||
2032 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2033 data->acregmin != nfss->acregmin / HZ ||
2034 data->acregmax != nfss->acregmax / HZ ||
2035 data->acdirmin != nfss->acdirmin / HZ ||
2036 data->acdirmax != nfss->acdirmax / HZ ||
2037 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2038 data->nfs_server.port != nfss->port ||
48b605f8 2039 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2040 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2041 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2042 return -EINVAL;
2043
2044 return 0;
2045}
2046
2047static int
2048nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2049{
2050 int error;
2051 struct nfs_server *nfss = sb->s_fs_info;
2052 struct nfs_parsed_mount_data *data;
2053 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2054 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2055 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2056
2057 /*
2058 * Userspace mount programs that send binary options generally send
2059 * them populated with default values. We have no way to know which
2060 * ones were explicitly specified. Fall back to legacy behavior and
2061 * just return success.
2062 */
31c94469
MZ		 2063 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2064 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2065 options->version <= 6))))
48b605f8
JL		 2066 return 0;
2067
2068 data = kzalloc(sizeof(*data), GFP_KERNEL);
2069 if (data == NULL)
2070 return -ENOMEM;
2071
2072 /* fill out struct with values from existing mount */
2073 data->flags = nfss->flags;
2074 data->rsize = nfss->rsize;
2075 data->wsize = nfss->wsize;
2076 data->retrans = nfss->client->cl_timeout->to_retries;
2077 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2078 data->acregmin = nfss->acregmin / HZ;
2079 data->acregmax = nfss->acregmax / HZ;
2080 data->acdirmin = nfss->acdirmin / HZ;
2081 data->acdirmax = nfss->acdirmax / HZ;
2082 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2083 data->nfs_server.port = nfss->port;
48b605f8
JL		 2084 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2085 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2086 data->nfs_server.addrlen);
2087
2088 /* overwrite those values with any that were specified */
2089 error = nfs_parse_mount_options((char *)options, data);
2090 if (error < 0)
2091 goto out;
2092
26c4c170
JL		 2093 /*
2094 * noac is a special case. It implies -o sync, but that's not
2095 * necessarily reflected in the mtab options. do_remount_sb
2096 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2097 * remount options, so we have to explicitly reset it.
2098 */
2099 if (data->flags & NFS_MOUNT_NOAC)
2100 *flags |= MS_SYNCHRONOUS;
2101
48b605f8
JL		 2102 /* compare new mount options with old ones */
2103 error = nfs_compare_remount_data(nfss, data);
2104out:
2105 kfree(data);
2106 return error;
2107}
2108
f7b422b1 2109/*
54ceac45 2110 * Initialise the common bits of the superblock
f7b422b1 2111 */
54ceac45 2112static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2113{
54ceac45 2114 struct nfs_server *server = NFS_SB(sb);
5006a76c 2115
54ceac45 2116 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2117
54ceac45
DH		 2118 /* We probably want something more informative here */
2119 snprintf(sb->s_id, sizeof(sb->s_id),
2120 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2121
54ceac45
DH		 2122 if (sb->s_blocksize == 0)
2123 sb->s_blocksize = nfs_block_bits(server->wsize,
2124 &sb->s_blocksize_bits);
f7b422b1 2125
32a88aa1
JA		 2126 sb->s_bdi = &server->backing_dev_info;
2127
54ceac45 2128 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2129}
2130
2131/*
54ceac45 2132 * Finish setting up an NFS2/3 superblock
f7b422b1 2133 */
2283f8d6
TT		 2134static void nfs_fill_super(struct super_block *sb,
2135 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2136{
2137 struct nfs_server *server = NFS_SB(sb);
5006a76c 2138
54ceac45
DH		 2139 sb->s_blocksize_bits = 0;
2140 sb->s_blocksize = 0;
2141 if (data->bsize)
2142 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2143
8a6e5deb 2144 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2145 /* The VFS shouldn't apply the umask to mode bits. We will do
2146 * so ourselves when necessary.
2147 */
2148 sb->s_flags |= MS_POSIXACL;
2149 sb->s_time_gran = 1;
816724e6 2150 }
54ceac45
DH		 2151
2152 sb->s_op = &nfs_sops;
2153 nfs_initialise_sb(sb);
f7b422b1
DH		 2154}
2155
2156/*
54ceac45 2157 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2158 */
54ceac45
DH		 2159static void nfs_clone_super(struct super_block *sb,
2160 const struct super_block *old_sb)
f7b422b1 2161{
54ceac45
DH		 2162 struct nfs_server *server = NFS_SB(sb);
2163
2164 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2165 sb->s_blocksize = old_sb->s_blocksize;
2166 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2167
8a6e5deb 2168 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2169 /* The VFS shouldn't apply the umask to mode bits. We will do
2170 * so ourselves when necessary.
f7b422b1
DH		 2171 */
2172 sb->s_flags |= MS_POSIXACL;
f7b422b1 2173 sb->s_time_gran = 1;
f7b422b1
DH		 2174 }
2175
54ceac45
DH		 2176 sb->s_op = old_sb->s_op;
2177 nfs_initialise_sb(sb);
f7b422b1
DH		 2178}
2179
275a5d24
TM		 2180static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2181{
2182 const struct nfs_server *a = s->s_fs_info;
2183 const struct rpc_clnt *clnt_a = a->client;
2184 const struct rpc_clnt *clnt_b = b->client;
2185
2186 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2187 goto Ebusy;
2188 if (a->nfs_client != b->nfs_client)
2189 goto Ebusy;
2190 if (a->flags != b->flags)
2191 goto Ebusy;
2192 if (a->wsize != b->wsize)
2193 goto Ebusy;
2194 if (a->rsize != b->rsize)
2195 goto Ebusy;
2196 if (a->acregmin != b->acregmin)
2197 goto Ebusy;
2198 if (a->acregmax != b->acregmax)
2199 goto Ebusy;
2200 if (a->acdirmin != b->acdirmin)
2201 goto Ebusy;
2202 if (a->acdirmax != b->acdirmax)
2203 goto Ebusy;
2204 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2205 goto Ebusy;
e89a5a43 2206 return 1;
275a5d24 2207Ebusy:
e89a5a43
TM		 2208 return 0;
2209}
2210
2211struct nfs_sb_mountdata {
2212 struct nfs_server *server;
2213 int mntflags;
2214};
2215
2216static int nfs_set_super(struct super_block *s, void *data)
2217{
2218 struct nfs_sb_mountdata *sb_mntdata = data;
2219 struct nfs_server *server = sb_mntdata->server;
2220 int ret;
2221
2222 s->s_flags = sb_mntdata->mntflags;
2223 s->s_fs_info = server;
8b244ff2 2224 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2225 ret = set_anon_super(s, server);
2226 if (ret == 0)
2227 server->s_dev = s->s_dev;
2228 return ret;
2229}
2230
fd00a8ff
CL		 2231static int nfs_compare_super_address(struct nfs_server *server1,
2232 struct nfs_server *server2)
2233{
2234 struct sockaddr *sap1, *sap2;
2235
2236 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2237 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2238
2239 if (sap1->sa_family != sap2->sa_family)
2240 return 0;
2241
2242 switch (sap1->sa_family) {
2243 case AF_INET: {
2244 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2245 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2246 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2247 return 0;
2248 if (sin1->sin_port != sin2->sin_port)
2249 return 0;
2250 break;
2251 }
2252 case AF_INET6: {
2253 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2254 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2255 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2256 return 0;
2257 if (sin1->sin6_port != sin2->sin6_port)
2258 return 0;
2259 break;
2260 }
2261 default:
2262 return 0;
2263 }
2264
2265 return 1;
2266}
2267
e89a5a43
TM		 2268static int nfs_compare_super(struct super_block *sb, void *data)
2269{
2270 struct nfs_sb_mountdata *sb_mntdata = data;
2271 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2272 int mntflags = sb_mntdata->mntflags;
2273
fd00a8ff 2274 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2275 return 0;
2276 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2277 if (old->flags & NFS_MOUNT_UNSHARED)
2278 return 0;
2279 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2280 return 0;
2281 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2282}
2283
fa799759
MS		 2284static int nfs_bdi_register(struct nfs_server *server)
2285{
2286 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2287}
2288
01194981
AV		 2289static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2290 int flags, const char *dev_name, void *raw_data)
f7b422b1 2291{
f7b422b1
DH		 2292 struct nfs_server *server = NULL;
2293 struct super_block *s;
33852a1f
TM		 2294 struct nfs_parsed_mount_data *data;
2295 struct nfs_fh *mntfh;
01194981 2296 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2297 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2298 struct nfs_sb_mountdata sb_mntdata = {
2299 .mntflags = flags,
2300 };
01194981 2301 int error;
33852a1f 2302
1e657bd5 2303 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2304 mntfh = nfs_alloc_fhandle();
33852a1f 2305 if (data == NULL || mntfh == NULL)
8a0d551a 2306 goto out;
f9c3a380 2307
54ceac45 2308 /* Validate the mount data */
33852a1f 2309 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2310 if (error < 0) {
2311 mntroot = ERR_PTR(error);
0655960f 2312 goto out;
01194981 2313 }
f7b422b1 2314
764302cc
CL		 2315#ifdef CONFIG_NFS_V4
2316 if (data->version == 4) {
01194981 2317 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2318 goto out;
2319 }
2320#endif /* CONFIG_NFS_V4 */
2321
54ceac45 2322 /* Get a volume representation */
33852a1f 2323 server = nfs_create_server(data, mntfh);
54ceac45 2324 if (IS_ERR(server)) {
01194981 2325 mntroot = ERR_CAST(server);
0655960f 2326 goto out;
f7b422b1 2327 }
e89a5a43 2328 sb_mntdata.server = server;
f7b422b1 2329
75180df2
TM		 2330 if (server->flags & NFS_MOUNT_UNSHARED)
2331 compare_super = NULL;
2332
fb2088cc
SP		 2333 /* -o noac implies -o sync */
2334 if (server->flags & NFS_MOUNT_NOAC)
2335 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2336
54ceac45 2337 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2338 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2339 if (IS_ERR(s)) {
01194981 2340 mntroot = ERR_CAST(s);
54ceac45 2341 goto out_err_nosb;
816724e6
TM		 2342 }
2343
54ceac45
DH		 2344 if (s->s_fs_info != server) {
2345 nfs_free_server(server);
2346 server = NULL;
fa799759
MS		 2347 } else {
2348 error = nfs_bdi_register(server);
01194981
AV		 2349 if (error) {
2350 mntroot = ERR_PTR(error);
cfbc0683 2351 goto error_splat_bdi;
01194981 2352 }
54ceac45 2353 }
f7b422b1 2354
54ceac45
DH		 2355 if (!s->s_root) {
2356 /* initial superblock/root creation */
33852a1f 2357 nfs_fill_super(s, data);
160bc160 2358 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2359 }
f7b422b1 2360
0d5839ad 2361 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2362 if (IS_ERR(mntroot))
54ceac45 2363 goto error_splat_super;
816724e6 2364
33852a1f 2365 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2366 if (error)
2367 goto error_splat_root;
2368
54ceac45 2369 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2370
2371out:
8a0d551a 2372 nfs_free_parsed_mount_data(data);
b157b06c 2373 nfs_free_fhandle(mntfh);
01194981 2374 return mntroot;
816724e6 2375
54ceac45
DH		 2376out_err_nosb:
2377 nfs_free_server(server);
0655960f 2378 goto out;
54ceac45 2379
f9c3a380
EP		 2380error_splat_root:
2381 dput(mntroot);
01194981 2382 mntroot = ERR_PTR(error);
54ceac45 2383error_splat_super:
cfbc0683
N		 2384 if (server && !s->s_root)
2385 bdi_unregister(&server->backing_dev_info);
2386error_splat_bdi:
6f5bbff9 2387 deactivate_locked_super(s);
0655960f 2388 goto out;
f7b422b1
DH		 2389}
2390
387c149b
TM		 2391/*
2392 * Ensure that we unregister the bdi before kill_anon_super
2393 * releases the device name
2394 */
2395static void nfs_put_super(struct super_block *s)
2396{
2397 struct nfs_server *server = NFS_SB(s);
2398
2399 bdi_unregister(&server->backing_dev_info);
2400}
2401
54ceac45
DH		 2402/*
2403 * Destroy an NFS2/3 superblock
2404 */
f7b422b1
DH		 2405static void nfs_kill_super(struct super_block *s)
2406{
2407 struct nfs_server *server = NFS_SB(s);
2408
2409 kill_anon_super(s);
08734048 2410 nfs_fscache_release_super_cookie(s);
54ceac45 2411 nfs_free_server(server);
f7b422b1
DH		 2412}
2413
54ceac45
DH		 2414/*
2415 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2416 */
31f43471
AV		 2417static struct dentry *
2418nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2419 const char *dev_name, void *raw_data)
f7b422b1
DH		 2420{
2421 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2422 struct super_block *s;
2423 struct nfs_server *server;
2424 struct dentry *mntroot;
75180df2 2425 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2426 struct nfs_sb_mountdata sb_mntdata = {
2427 .mntflags = flags,
2428 };
54ceac45 2429 int error;
f7b422b1 2430
31f43471 2431 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2432
54ceac45
DH		 2433 /* create a new volume representation */
2434 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2435 if (IS_ERR(server)) {
2436 error = PTR_ERR(server);
2437 goto out_err_noserver;
2438 }
e89a5a43 2439 sb_mntdata.server = server;
8fa5c000 2440
75180df2
TM		 2441 if (server->flags & NFS_MOUNT_UNSHARED)
2442 compare_super = NULL;
2443
fb2088cc
SP		 2444 /* -o noac implies -o sync */
2445 if (server->flags & NFS_MOUNT_NOAC)
2446 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2447
54ceac45 2448 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2449 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2450 if (IS_ERR(s)) {
2451 error = PTR_ERR(s);
2452 goto out_err_nosb;
2453 }
5006a76c 2454
54ceac45
DH		 2455 if (s->s_fs_info != server) {
2456 nfs_free_server(server);
2457 server = NULL;
fa799759
MS		 2458 } else {
2459 error = nfs_bdi_register(server);
2460 if (error)
cfbc0683 2461 goto error_splat_bdi;
f7b422b1 2462 }
24c8dbbb 2463
54ceac45
DH		 2464 if (!s->s_root) {
2465 /* initial superblock/root creation */
54ceac45 2466 nfs_clone_super(s, data->sb);
2df54806 2467 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2468 }
f7b422b1 2469
0d5839ad 2470 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2471 if (IS_ERR(mntroot)) {
2472 error = PTR_ERR(mntroot);
2473 goto error_splat_super;
f7b422b1 2474 }
e9cc6c23 2475 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2476 dput(mntroot);
2477 error = -ESTALE;
2478 goto error_splat_super;
2479 }
f7b422b1 2480
54ceac45 2481 s->s_flags |= MS_ACTIVE;
f7b422b1 2482
f9c3a380
EP		 2483 /* clone any lsm security options from the parent to the new sb */
2484 security_sb_clone_mnt_opts(data->sb, s);
2485
31f43471
AV		 2486 dprintk("<-- nfs_xdev_mount() = 0\n");
2487 return mntroot;
24c8dbbb 2488
54ceac45
DH		 2489out_err_nosb:
2490 nfs_free_server(server);
2491out_err_noserver:
31f43471
AV		 2492 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2493 return ERR_PTR(error);
f7b422b1 2494
54ceac45 2495error_splat_super:
cfbc0683
N		 2496 if (server && !s->s_root)
2497 bdi_unregister(&server->backing_dev_info);
2498error_splat_bdi:
6f5bbff9 2499 deactivate_locked_super(s);
31f43471
AV		 2500 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2501 return ERR_PTR(error);
f7b422b1
DH		 2502}
2503
54ceac45
DH		 2504#ifdef CONFIG_NFS_V4
2505
f7b422b1 2506/*
54ceac45 2507 * Finish setting up a cloned NFS4 superblock
f7b422b1 2508 */
54ceac45
DH		 2509static void nfs4_clone_super(struct super_block *sb,
2510 const struct super_block *old_sb)
f7b422b1 2511{
54ceac45
DH		 2512 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2513 sb->s_blocksize = old_sb->s_blocksize;
2514 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2515 sb->s_time_gran = 1;
54ceac45 2516 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2517 /*
2518 * The VFS shouldn't apply the umask to mode bits. We will do
2519 * so ourselves when necessary.
2520 */
2521 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2522 sb->s_xattr = old_sb->s_xattr;
2523 nfs_initialise_sb(sb);
f7b422b1
DH		 2524}
2525
54ceac45
DH		 2526/*
2527 * Set up an NFS4 superblock
2528 */
2529static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2530{
54ceac45
DH		 2531 sb->s_time_gran = 1;
2532 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2533 /*
2534 * The VFS shouldn't apply the umask to mode bits. We will do
2535 * so ourselves when necessary.
2536 */
2537 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2538 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2539 nfs_initialise_sb(sb);
f7b422b1
DH		 2540}
2541
01c3f052
TM		 2542static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2543{
5eebde23
SJ		 2544 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2545 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2546}
2547
7630c852
CL		 2548static int nfs4_validate_text_mount_data(void *options,
2549 struct nfs_parsed_mount_data *args,
2550 const char *dev_name)
2551{
2552 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2553
f5855fec 2554 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2555
2556 nfs_validate_transport_protocol(args);
2557
2558 nfs4_validate_mount_flags(args);
2559
2ecda72b
TM		 2560 if (args->version != 4) {
2561 dfprintk(MOUNT,
2562 "NFS4: Illegal mount version\n");
2563 return -EINVAL;
2564 }
2565
7630c852
CL		 2566 if (args->auth_flavor_len > 1) {
2567 dfprintk(MOUNT,
2568 "NFS4: Too many RPC auth flavours specified\n");
2569 return -EINVAL;
2570 }
2571
2572 if (args->client_address == NULL) {
2573 dfprintk(MOUNT,
2574 "NFS4: mount program didn't pass callback address\n");
2575 return -EINVAL;
2576 }
2577
2578 return nfs_parse_devname(dev_name,
2579 &args->nfs_server.hostname,
2580 NFS4_MAXNAMLEN,
2581 &args->nfs_server.export_path,
2582 NFS4_MAXPATHLEN);
2583}
2584
f0768ebd
CL		 2585/*
2586 * Validate NFSv4 mount options
2587 */
91ea40b9
TT		 2588static int nfs4_validate_mount_data(void *options,
2589 struct nfs_parsed_mount_data *args,
2590 const char *dev_name)
f0768ebd 2591{
4cfd74fc 2592 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2593 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2594 char *c;
2595
2596 if (data == NULL)
2597 goto out_no_data;
2598
2599 switch (data->version) {
2600 case 1:
4c568017
CL		 2601 if (data->host_addrlen > sizeof(args->nfs_server.address))
2602 goto out_no_address;
2603 if (data->host_addrlen == 0)
f0768ebd 2604 goto out_no_address;
4c568017 2605 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2606 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2607 return -EFAULT;
4cfd74fc 2608 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2609 goto out_no_address;
2610
6738b251
CL		 2611 if (data->auth_flavourlen) {
2612 if (data->auth_flavourlen > 1)
2613 goto out_inval_auth;
20c71f5e 2614 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2615 data->auth_flavours,
20c71f5e 2616 sizeof(args->auth_flavors[0])))
f0768ebd 2617 return -EFAULT;
f0768ebd
CL		 2618 }
2619
2620 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2621 if (IS_ERR(c))
2622 return PTR_ERR(c);
91ea40b9 2623 args->nfs_server.hostname = c;
f0768ebd
CL		 2624
2625 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2626 if (IS_ERR(c))
2627 return PTR_ERR(c);
91ea40b9
TT		 2628 args->nfs_server.export_path = c;
2629 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2630
2631 c = strndup_user(data->client_addr.data, 16);
2632 if (IS_ERR(c))
2633 return PTR_ERR(c);
91ea40b9
TT		 2634 args->client_address = c;
2635
2636 /*
2637 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2638 * can deal with.
2639 */
2640
2641 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2642 args->rsize = data->rsize;
2643 args->wsize = data->wsize;
2644 args->timeo = data->timeo;
2645 args->retrans = data->retrans;
2646 args->acregmin = data->acregmin;
2647 args->acregmax = data->acregmax;
2648 args->acdirmin = data->acdirmin;
2649 args->acdirmax = data->acdirmax;
2650 args->nfs_server.protocol = data->proto;
259875ef 2651 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2652
2653 break;
7630c852 2654 default:
91ea40b9 2655 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2656 return -EINVAL;
2657
4cfd74fc 2658 if (!nfs_verify_server_address(sap))
80071225 2659 return -EINVAL;
dc045898 2660
7630c852 2661 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2662 }
2663
2664 return 0;
2665
2666out_no_data:
2667 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2668 return -EINVAL;
2669
2670out_inval_auth:
2671 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2672 data->auth_flavourlen);
2673 return -EINVAL;
2674
2675out_no_address:
2676 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2677 return -EINVAL;
f0768ebd
CL		 2678}
2679
54ceac45 2680/*
c02d7adf 2681 * Get the superblock for the NFS4 root partition
54ceac45 2682 */
31f43471
AV		 2683static struct dentry *
2684nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2685 const char *dev_name, void *raw_data)
f7b422b1 2686{
c02d7adf 2687 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2688 struct super_block *s;
2689 struct nfs_server *server;
33852a1f 2690 struct nfs_fh *mntfh;
54ceac45 2691 struct dentry *mntroot;
75180df2 2692 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2693 struct nfs_sb_mountdata sb_mntdata = {
2694 .mntflags = flags,
2695 };
33852a1f
TM		 2696 int error = -ENOMEM;
2697
b157b06c 2698 mntfh = nfs_alloc_fhandle();
33852a1f 2699 if (data == NULL || mntfh == NULL)
8a0d551a 2700 goto out;
f9c3a380 2701
54ceac45 2702 /* Get a volume representation */
33852a1f 2703 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2704 if (IS_ERR(server)) {
2705 error = PTR_ERR(server);
29eb981a 2706 goto out;
f7b422b1 2707 }
e89a5a43 2708 sb_mntdata.server = server;
f7b422b1 2709
75180df2
TM		 2710 if (server->flags & NFS4_MOUNT_UNSHARED)
2711 compare_super = NULL;
2712
fb2088cc
SP		 2713 /* -o noac implies -o sync */
2714 if (server->flags & NFS_MOUNT_NOAC)
2715 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2716
54ceac45 2717 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2718 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2719 if (IS_ERR(s)) {
2720 error = PTR_ERR(s);
f7b422b1 2721 goto out_free;
816724e6
TM		 2722 }
2723
5dd3177a
TM		 2724 if (s->s_fs_info != server) {
2725 nfs_free_server(server);
2726 server = NULL;
fa799759
MS		 2727 } else {
2728 error = nfs_bdi_register(server);
2729 if (error)
cfbc0683 2730 goto error_splat_bdi;
5dd3177a
TM		 2731 }
2732
54ceac45
DH		 2733 if (!s->s_root) {
2734 /* initial superblock/root creation */
54ceac45 2735 nfs4_fill_super(s);
c15c928f 2736 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2737 }
f7b422b1 2738
0d5839ad 2739 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2740 if (IS_ERR(mntroot)) {
2741 error = PTR_ERR(mntroot);
2742 goto error_splat_super;
f7b422b1 2743 }
54ceac45 2744
33852a1f 2745 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2746 if (error)
2747 goto error_splat_root;
2748
f7b422b1 2749 s->s_flags |= MS_ACTIVE;
31f43471 2750
31f43471
AV		 2751 nfs_free_fhandle(mntfh);
2752 return mntroot;
29eb981a
CL		 2753
2754out:
b157b06c 2755 nfs_free_fhandle(mntfh);
31f43471 2756 return ERR_PTR(error);
54ceac45 2757
f7b422b1 2758out_free:
54ceac45 2759 nfs_free_server(server);
29eb981a 2760 goto out;
54ceac45 2761
46c8ac74
EP		 2762error_splat_root:
2763 dput(mntroot);
54ceac45 2764error_splat_super:
cfbc0683
N		 2765 if (server && !s->s_root)
2766 bdi_unregister(&server->backing_dev_info);
2767error_splat_bdi:
6f5bbff9 2768 deactivate_locked_super(s);
29eb981a 2769 goto out;
f7b422b1
DH		 2770}
2771
c02d7adf
TM		 2772static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2773 int flags, void *data, const char *hostname)
2774{
2775 struct vfsmount *root_mnt;
2776 char *root_devname;
2777 size_t len;
2778
2779 len = strlen(hostname) + 3;
2780 root_devname = kmalloc(len, GFP_KERNEL);
2781 if (root_devname == NULL)
2782 return ERR_PTR(-ENOMEM);
2783 snprintf(root_devname, len, "%s:/", hostname);
2784 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2785 kfree(root_devname);
2786 return root_mnt;
2787}
2788
ce587e07
TM		 2789struct nfs_referral_count {
2790 struct list_head list;
2791 const struct task_struct *task;
2792 unsigned int referral_count;
2793};
2794
2795static LIST_HEAD(nfs_referral_count_list);
2796static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2797
2798static struct nfs_referral_count *nfs_find_referral_count(void)
2799{
2800 struct nfs_referral_count *p;
2801
2802 list_for_each_entry(p, &nfs_referral_count_list, list) {
2803 if (p->task == current)
2804 return p;
2805 }
2806 return NULL;
2807}
2808
2809#define NFS_MAX_NESTED_REFERRALS 2
2810
2811static int nfs_referral_loop_protect(void)
2812{
2813 struct nfs_referral_count *p, *new;
2814 int ret = -ENOMEM;
2815
2816 new = kmalloc(sizeof(*new), GFP_KERNEL);
2817 if (!new)
2818 goto out;
2819 new->task = current;
2820 new->referral_count = 1;
2821
2822 ret = 0;
2823 spin_lock(&nfs_referral_count_list_lock);
2824 p = nfs_find_referral_count();
2825 if (p != NULL) {
2826 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2827 ret = -ELOOP;
2828 else
2829 p->referral_count++;
2830 } else {
2831 list_add(&new->list, &nfs_referral_count_list);
2832 new = NULL;
2833 }
2834 spin_unlock(&nfs_referral_count_list_lock);
2835 kfree(new);
2836out:
2837 return ret;
2838}
2839
2840static void nfs_referral_loop_unprotect(void)
2841{
2842 struct nfs_referral_count *p;
2843
2844 spin_lock(&nfs_referral_count_list_lock);
2845 p = nfs_find_referral_count();
2846 p->referral_count--;
2847 if (p->referral_count == 0)
2848 list_del(&p->list);
2849 else
2850 p = NULL;
2851 spin_unlock(&nfs_referral_count_list_lock);
2852 kfree(p);
2853}
2854
01194981
AV		 2855static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2856 const char *export_path)
c02d7adf 2857{
01194981 2858 struct dentry *dentry;
5352d3b6 2859 int err;
c02d7adf 2860
5352d3b6
AV		 2861 if (IS_ERR(root_mnt))
2862 return ERR_CAST(root_mnt);
2863
2864 err = nfs_referral_loop_protect();
2865 if (err) {
ea441d11 2866 mntput(root_mnt);
5352d3b6 2867 return ERR_PTR(err);
ea441d11 2868 }
c02d7adf 2869
ea441d11
AV		 2870 dentry = mount_subtree(root_mnt, export_path);
2871 nfs_referral_loop_unprotect();
c02d7adf 2872
01194981 2873 return dentry;
c02d7adf
TM		 2874}
2875
01194981
AV		 2876static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2877 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2878{
2879 char *export_path;
2880 struct vfsmount *root_mnt;
01194981 2881 struct dentry *res;
a6fe23be
CL		 2882
2883 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2884
2885 export_path = data->nfs_server.export_path;
2886 data->nfs_server.export_path = "/";
2887 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2888 data->nfs_server.hostname);
2889 data->nfs_server.export_path = export_path;
2890
5352d3b6 2891 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2892
01194981
AV		 2893 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2894 IS_ERR(res) ? PTR_ERR(res) : 0,
2895 IS_ERR(res) ? " [error]" : "");
2896 return res;
a6fe23be
CL		 2897}
2898
c02d7adf
TM		 2899/*
2900 * Get the superblock for an NFS4 mountpoint
2901 */
01194981
AV		 2902static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2903 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2904{
2905 struct nfs_parsed_mount_data *data;
c02d7adf 2906 int error = -ENOMEM;
01194981 2907 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2908
c5811dbd 2909 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2910 if (data == NULL)
8a0d551a 2911 goto out;
c02d7adf
TM		 2912
2913 /* Validate the mount data */
2914 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2915 if (error < 0) {
2916 res = ERR_PTR(error);
c02d7adf 2917 goto out;
01194981 2918 }
c02d7adf 2919
01194981
AV		 2920 res = nfs4_try_mount(flags, dev_name, data);
2921 if (IS_ERR(res))
2922 error = PTR_ERR(res);
c02d7adf
TM		 2923
2924out:
8a0d551a 2925 nfs_free_parsed_mount_data(data);
01194981 2926 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2927 error != 0 ? " [error]" : "");
01194981 2928 return res;
c02d7adf
TM		 2929}
2930
f7b422b1
DH		 2931static void nfs4_kill_super(struct super_block *sb)
2932{
2933 struct nfs_server *server = NFS_SB(sb);
2934
0f3e66c6 2935 dprintk("--> %s\n", __func__);
515d8611 2936 nfs_super_return_all_delegations(sb);
f7b422b1 2937 kill_anon_super(sb);
08734048 2938 nfs_fscache_release_super_cookie(sb);
54ceac45 2939 nfs_free_server(server);
0f3e66c6 2940 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2941}
2942
2943/*
54ceac45 2944 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2945 */
31f43471
AV		 2946static struct dentry *
2947nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2948 const char *dev_name, void *raw_data)
f7b422b1 2949{
54ceac45
DH		 2950 struct nfs_clone_mount *data = raw_data;
2951 struct super_block *s;
2952 struct nfs_server *server;
2953 struct dentry *mntroot;
75180df2 2954 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2955 struct nfs_sb_mountdata sb_mntdata = {
2956 .mntflags = flags,
2957 };
54ceac45 2958 int error;
f7b422b1 2959
31f43471 2960 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2961
54ceac45
DH		 2962 /* create a new volume representation */
2963 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2964 if (IS_ERR(server)) {
2965 error = PTR_ERR(server);
2966 goto out_err_noserver;
f7b422b1 2967 }
e89a5a43 2968 sb_mntdata.server = server;
f7b422b1 2969
75180df2
TM		 2970 if (server->flags & NFS4_MOUNT_UNSHARED)
2971 compare_super = NULL;
2972
fb2088cc
SP		 2973 /* -o noac implies -o sync */
2974 if (server->flags & NFS_MOUNT_NOAC)
2975 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2976
54ceac45 2977 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2978 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2979 if (IS_ERR(s)) {
2980 error = PTR_ERR(s);
2981 goto out_err_nosb;
f7b422b1 2982 }
f7b422b1 2983
54ceac45
DH		 2984 if (s->s_fs_info != server) {
2985 nfs_free_server(server);
2986 server = NULL;
fa799759
MS		 2987 } else {
2988 error = nfs_bdi_register(server);
2989 if (error)
cfbc0683 2990 goto error_splat_bdi;
54ceac45 2991 }
f7b422b1 2992
54ceac45
DH		 2993 if (!s->s_root) {
2994 /* initial superblock/root creation */
54ceac45 2995 nfs4_clone_super(s, data->sb);
2df54806 2996 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2997 }
f7b422b1 2998
0d5839ad 2999 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 3000 if (IS_ERR(mntroot)) {
3001 error = PTR_ERR(mntroot);
3002 goto error_splat_super;
3003 }
e9cc6c23
TM		 3004 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3005 dput(mntroot);
3006 error = -ESTALE;
3007 goto error_splat_super;
3008 }
f7b422b1 3009
54ceac45 3010 s->s_flags |= MS_ACTIVE;
54ceac45 3011
46c8ac74
EP		 3012 security_sb_clone_mnt_opts(data->sb, s);
3013
31f43471
AV		 3014 dprintk("<-- nfs4_xdev_mount() = 0\n");
3015 return mntroot;
54ceac45
DH		 3016
3017out_err_nosb:
3018 nfs_free_server(server);
3019out_err_noserver:
31f43471
AV		 3020 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
3021 return ERR_PTR(error);
54ceac45
DH		 3022
3023error_splat_super:
cfbc0683
N		 3024 if (server && !s->s_root)
3025 bdi_unregister(&server->backing_dev_info);
3026error_splat_bdi:
6f5bbff9 3027 deactivate_locked_super(s);
31f43471
AV		 3028 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
3029 return ERR_PTR(error);
f7b422b1
DH		 3030}
3031
31f43471
AV		 3032static struct dentry *
3033nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
3034 const char *dev_name, void *raw_data)
f7b422b1
DH		 3035{
3036 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 3037 struct super_block *s;
3038 struct nfs_server *server;
3039 struct dentry *mntroot;
4f727296 3040 struct nfs_fh *mntfh;
75180df2 3041 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 3042 struct nfs_sb_mountdata sb_mntdata = {
3043 .mntflags = flags,
3044 };
4f727296 3045 int error = -ENOMEM;
54ceac45
DH		 3046
3047 dprintk("--> nfs4_referral_get_sb()\n");
3048
4f727296
TM		 3049 mntfh = nfs_alloc_fhandle();
3050 if (mntfh == NULL)
3051 goto out_err_nofh;
3052
54ceac45 3053 /* create a new volume representation */
4f727296 3054 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 3055 if (IS_ERR(server)) {
3056 error = PTR_ERR(server);
3057 goto out_err_noserver;
3058 }
e89a5a43 3059 sb_mntdata.server = server;
54ceac45 3060
75180df2
TM		 3061 if (server->flags & NFS4_MOUNT_UNSHARED)
3062 compare_super = NULL;
3063
fb2088cc
SP		 3064 /* -o noac implies -o sync */
3065 if (server->flags & NFS_MOUNT_NOAC)
3066 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3067
54ceac45 3068 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3069 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3070 if (IS_ERR(s)) {
3071 error = PTR_ERR(s);
3072 goto out_err_nosb;
3073 }
3074
3075 if (s->s_fs_info != server) {
3076 nfs_free_server(server);
3077 server = NULL;
fa799759
MS		 3078 } else {
3079 error = nfs_bdi_register(server);
3080 if (error)
cfbc0683 3081 goto error_splat_bdi;
54ceac45
DH		 3082 }
3083
3084 if (!s->s_root) {
3085 /* initial superblock/root creation */
54ceac45 3086 nfs4_fill_super(s);
2df54806 3087 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3088 }
3089
0d5839ad 3090 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3091 if (IS_ERR(mntroot)) {
3092 error = PTR_ERR(mntroot);
3093 goto error_splat_super;
3094 }
e9cc6c23
TM		 3095 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3096 dput(mntroot);
3097 error = -ESTALE;
3098 goto error_splat_super;
3099 }
54ceac45
DH		 3100
3101 s->s_flags |= MS_ACTIVE;
54ceac45 3102
46c8ac74
EP		 3103 security_sb_clone_mnt_opts(data->sb, s);
3104
4f727296 3105 nfs_free_fhandle(mntfh);
54ceac45 3106 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3107 return mntroot;
54ceac45
DH		 3108
3109out_err_nosb:
3110 nfs_free_server(server);
3111out_err_noserver:
4f727296
TM		 3112 nfs_free_fhandle(mntfh);
3113out_err_nofh:
54ceac45 3114 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3115 return ERR_PTR(error);
54ceac45
DH		 3116
3117error_splat_super:
cfbc0683
N		 3118 if (server && !s->s_root)
3119 bdi_unregister(&server->backing_dev_info);
3120error_splat_bdi:
6f5bbff9 3121 deactivate_locked_super(s);
4f727296 3122 nfs_free_fhandle(mntfh);
54ceac45 3123 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3124 return ERR_PTR(error);
f7b422b1
DH		 3125}
3126
c02d7adf
TM		 3127/*
3128 * Create an NFS4 server record on referral traversal
3129 */
01194981
AV		 3130static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3131 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3132{
3133 struct nfs_clone_mount *data = raw_data;
3134 char *export_path;
3135 struct vfsmount *root_mnt;
01194981 3136 struct dentry *res;
c02d7adf 3137
01194981 3138 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3139
3140 export_path = data->mnt_path;
3141 data->mnt_path = "/";
3142
3143 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3144 flags, data, data->hostname);
3145 data->mnt_path = export_path;
3146
5352d3b6 3147 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3148 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3149 IS_ERR(res) ? PTR_ERR(res) : 0,
3150 IS_ERR(res) ? " [error]" : "");
3151 return res;
c02d7adf
TM		 3152}
3153
54ceac45 3154#endif /* CONFIG_NFS_V4 */
Linux kernel - Deliverables
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