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NFSv4.1: Add DESTROY_CLIENTID
[linux-2.6-block.git] / fs / nfs / super.c
CommitLineData
f7b422b1
DH		 1/*
2 * linux/fs/nfs/super.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
f7b422b1
DH		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 * Split from inode.c by David Howells <dhowells@redhat.com>
15 *
54ceac45
DH		 16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
f7b422b1
DH		 21 */
22
f7b422b1
DH		 23#include <linux/module.h>
24#include <linux/init.h>
25
26#include <linux/time.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/string.h>
30#include <linux/stat.h>
31#include <linux/errno.h>
32#include <linux/unistd.h>
33#include <linux/sunrpc/clnt.h>
34#include <linux/sunrpc/stats.h>
35#include <linux/sunrpc/metrics.h>
0896a725 36#include <linux/sunrpc/xprtsock.h>
2cf7ff7a 37#include <linux/sunrpc/xprtrdma.h>
f7b422b1
DH		 38#include <linux/nfs_fs.h>
39#include <linux/nfs_mount.h>
40#include <linux/nfs4_mount.h>
41#include <linux/lockd/bind.h>
f7b422b1
DH		 42#include <linux/seq_file.h>
43#include <linux/mount.h>
c02d7adf 44#include <linux/namei.h>
f7b422b1
DH		 45#include <linux/nfs_idmap.h>
46#include <linux/vfs.h>
47#include <linux/inet.h>
fd00a8ff 48#include <linux/in6.h>
5a0e3ad6 49#include <linux/slab.h>
fd00a8ff 50#include <net/ipv6.h>
d8e7748a 51#include <linux/netdevice.h>
f7b422b1 52#include <linux/nfs_xdr.h>
b5d5dfbd 53#include <linux/magic.h>
bf0fd768 54#include <linux/parser.h>
e50a7a1a 55#include <linux/nsproxy.h>
2446ab60 56#include <linux/rcupdate.h>
f7b422b1 57
f7b422b1
DH		 58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
b72e4f42 69#define NFS_TEXT_DATA 1
f7b422b1 70
1e657bd5
PZ		 71#ifdef CONFIG_NFS_V3
72#define NFS_DEFAULT_VERSION 3
73#else
74#define NFS_DEFAULT_VERSION 2
75#endif
76
bf0fd768
CL		 77enum {
78 /* Mount options that take no arguments */
79 Opt_soft, Opt_hard,
bf0fd768
CL		 80 Opt_posix, Opt_noposix,
81 Opt_cto, Opt_nocto,
82 Opt_ac, Opt_noac,
83 Opt_lock, Opt_nolock,
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" },
bf0fd768
CL		 136 { Opt_udp, "udp" },
137 { Opt_tcp, "tcp" },
2cf7ff7a 138 { Opt_rdma, "rdma" },
bf0fd768
CL		 139 { Opt_acl, "acl" },
140 { Opt_noacl, "noacl" },
141 { Opt_rdirplus, "rdirplus" },
142 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 143 { Opt_sharecache, "sharecache" },
144 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 145 { Opt_resvport, "resvport" },
146 { Opt_noresvport, "noresvport" },
b797cac7 147 { Opt_fscache, "fsc" },
b797cac7 148 { Opt_nofscache, "nofsc" },
bf0fd768 149
a5a16bae
CL		 150 { Opt_port, "port=%s" },
151 { Opt_rsize, "rsize=%s" },
152 { Opt_wsize, "wsize=%s" },
153 { Opt_bsize, "bsize=%s" },
154 { Opt_timeo, "timeo=%s" },
155 { Opt_retrans, "retrans=%s" },
156 { Opt_acregmin, "acregmin=%s" },
157 { Opt_acregmax, "acregmax=%s" },
158 { Opt_acdirmin, "acdirmin=%s" },
159 { Opt_acdirmax, "acdirmax=%s" },
160 { Opt_actimeo, "actimeo=%s" },
161 { Opt_namelen, "namlen=%s" },
162 { Opt_mountport, "mountport=%s" },
163 { Opt_mountvers, "mountvers=%s" },
0d71b058
TM		 164 { Opt_minorversion, "minorversion=%s" },
165
a5a16bae
CL		 166 { Opt_nfsvers, "nfsvers=%s" },
167 { Opt_nfsvers, "vers=%s" },
bf0fd768
CL		 168
169 { Opt_sec, "sec=%s" },
170 { Opt_proto, "proto=%s" },
171 { Opt_mountproto, "mountproto=%s" },
172 { Opt_addr, "addr=%s" },
173 { Opt_clientaddr, "clientaddr=%s" },
33832034 174 { Opt_mounthost, "mounthost=%s" },
0ac83779 175 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 176
7973c1f1 177 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 178 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 179 { Opt_local_lock, "local_lock=%s" },
7973c1f1 180
3862279a
TM		 181 /* The following needs to be listed after all other options */
182 { Opt_nfsvers, "v%s" },
183
bf0fd768
CL		 184 { Opt_err, NULL }
185};
186
187enum {
ee671b01 188 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 189
190 Opt_xprt_err
191};
192
a447c093 193static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 194 { Opt_xprt_udp, "udp" },
ee671b01 195 { Opt_xprt_udp6, "udp6" },
bf0fd768 196 { Opt_xprt_tcp, "tcp" },
ee671b01 197 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 198 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 199
200 { Opt_xprt_err, NULL }
201};
202
203enum {
204 Opt_sec_none, Opt_sec_sys,
205 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
206 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
207 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
208
209 Opt_sec_err
210};
211
a447c093 212static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 213 { Opt_sec_none, "none" },
214 { Opt_sec_none, "null" },
215 { Opt_sec_sys, "sys" },
216
217 { Opt_sec_krb5, "krb5" },
218 { Opt_sec_krb5i, "krb5i" },
219 { Opt_sec_krb5p, "krb5p" },
220
221 { Opt_sec_lkey, "lkey" },
222 { Opt_sec_lkeyi, "lkeyi" },
223 { Opt_sec_lkeyp, "lkeyp" },
224
8d042218
OK		 225 { Opt_sec_spkm, "spkm3" },
226 { Opt_sec_spkmi, "spkm3i" },
227 { Opt_sec_spkmp, "spkm3p" },
228
bf0fd768
CL		 229 { Opt_sec_err, NULL }
230};
231
7973c1f1
TM		 232enum {
233 Opt_lookupcache_all, Opt_lookupcache_positive,
234 Opt_lookupcache_none,
235
236 Opt_lookupcache_err
237};
238
239static match_table_t nfs_lookupcache_tokens = {
240 { Opt_lookupcache_all, "all" },
241 { Opt_lookupcache_positive, "pos" },
242 { Opt_lookupcache_positive, "positive" },
243 { Opt_lookupcache_none, "none" },
244
245 { Opt_lookupcache_err, NULL }
246};
247
5eebde23
SJ		 248enum {
249 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
250 Opt_local_lock_none,
251
252 Opt_local_lock_err
253};
254
255static match_table_t nfs_local_lock_tokens = {
256 { Opt_local_lock_all, "all" },
257 { Opt_local_lock_flock, "flock" },
258 { Opt_local_lock_posix, "posix" },
259 { Opt_local_lock_none, "none" },
260
261 { Opt_local_lock_err, NULL }
262};
263
0d71b058
TM		 264enum {
265 Opt_vers_2, Opt_vers_3, Opt_vers_4, Opt_vers_4_0,
266 Opt_vers_4_1,
267
268 Opt_vers_err
269};
270
271static match_table_t nfs_vers_tokens = {
272 { Opt_vers_2, "2" },
273 { Opt_vers_3, "3" },
274 { Opt_vers_4, "4" },
275 { Opt_vers_4_0, "4.0" },
276 { Opt_vers_4_1, "4.1" },
277
278 { Opt_vers_err, NULL }
279};
bf0fd768 280
c40f8d1d
BS		 281struct nfs_mount_info {
282 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
3d176e3f 283 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
c40f8d1d 284 struct nfs_parsed_mount_data *parsed;
8c958e0c 285 struct nfs_clone_mount *cloned;
87c7083d 286 struct nfs_fh *mntfh;
c40f8d1d
BS		 287};
288
42faad99 289static void nfs_umount_begin(struct super_block *);
816724e6 290static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 291static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 292static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 293static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 294static int nfs_show_stats(struct seq_file *, struct dentry *);
486aa699 295static struct dentry *nfs_fs_mount_common(struct file_system_type *,
87c7083d 296 struct nfs_server *, int, const char *, struct nfs_mount_info *);
01194981
AV		 297static struct dentry *nfs_fs_mount(struct file_system_type *,
298 int, const char *, void *);
31f43471
AV		 299static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
300 int flags, const char *dev_name, void *raw_data);
387c149b 301static void nfs_put_super(struct super_block *);
f7b422b1 302static void nfs_kill_super(struct super_block *);
48b605f8 303static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 304
305static struct file_system_type nfs_fs_type = {
306 .owner = THIS_MODULE,
307 .name = "nfs",
01194981 308 .mount = nfs_fs_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
54ceac45 313struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 314 .owner = THIS_MODULE,
315 .name = "nfs",
31f43471 316 .mount = nfs_xdev_mount,
f7b422b1 317 .kill_sb = nfs_kill_super,
349457cc 318 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 319};
320
ee9b6d61 321static const struct super_operations nfs_sops = {
f7b422b1
DH		 322 .alloc_inode = nfs_alloc_inode,
323 .destroy_inode = nfs_destroy_inode,
324 .write_inode = nfs_write_inode,
387c149b 325 .put_super = nfs_put_super,
f7b422b1 326 .statfs = nfs_statfs,
b57922d9 327 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 328 .umount_begin = nfs_umount_begin,
329 .show_options = nfs_show_options,
c7f404b4
AV		 330 .show_devname = nfs_show_devname,
331 .show_path = nfs_show_path,
f7b422b1 332 .show_stats = nfs_show_stats,
48b605f8 333 .remount_fs = nfs_remount,
f7b422b1
DH		 334};
335
336#ifdef CONFIG_NFS_V4
b72e4f42 337static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *);
d72c727c
BS		 338static int nfs4_validate_mount_data(void *options,
339 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981 340static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
87c7083d 341 struct nfs_mount_info *mount_info);
31f43471
AV		 342static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
343 int flags, const char *dev_name, void *raw_data);
344static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
345 int flags, const char *dev_name, void *raw_data);
01194981
AV		 346static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
347 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 348static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
349 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 350static void nfs4_kill_super(struct super_block *sb);
351
352static struct file_system_type nfs4_fs_type = {
353 .owner = THIS_MODULE,
354 .name = "nfs4",
87c7083d 355 .mount = nfs_fs_mount,
f7b422b1 356 .kill_sb = nfs4_kill_super,
349457cc 357 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 358};
359
c02d7adf
TM		 360static struct file_system_type nfs4_remote_fs_type = {
361 .owner = THIS_MODULE,
362 .name = "nfs4",
31f43471 363 .mount = nfs4_remote_mount,
c02d7adf
TM		 364 .kill_sb = nfs4_kill_super,
365 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
366};
367
54ceac45 368struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 369 .owner = THIS_MODULE,
370 .name = "nfs4",
31f43471 371 .mount = nfs4_xdev_mount,
f7b422b1 372 .kill_sb = nfs4_kill_super,
349457cc 373 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 374};
375
c02d7adf
TM		 376static struct file_system_type nfs4_remote_referral_fs_type = {
377 .owner = THIS_MODULE,
378 .name = "nfs4",
31f43471 379 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 380 .kill_sb = nfs4_kill_super,
381 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
382};
383
54ceac45 384struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 385 .owner = THIS_MODULE,
386 .name = "nfs4",
01194981 387 .mount = nfs4_referral_mount,
f7b422b1 388 .kill_sb = nfs4_kill_super,
349457cc 389 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 390};
391
ee9b6d61 392static const struct super_operations nfs4_sops = {
f7b422b1
DH		 393 .alloc_inode = nfs_alloc_inode,
394 .destroy_inode = nfs_destroy_inode,
395 .write_inode = nfs_write_inode,
387c149b 396 .put_super = nfs_put_super,
f7b422b1 397 .statfs = nfs_statfs,
b57922d9 398 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 399 .umount_begin = nfs_umount_begin,
400 .show_options = nfs_show_options,
c7f404b4
AV		 401 .show_devname = nfs_show_devname,
402 .show_path = nfs_show_path,
f7b422b1 403 .show_stats = nfs_show_stats,
48b605f8 404 .remount_fs = nfs_remount,
f7b422b1
DH		 405};
406#endif
407
8e1f936b
RR		 408static struct shrinker acl_shrinker = {
409 .shrink = nfs_access_cache_shrinker,
410 .seeks = DEFAULT_SEEKS,
411};
979df72e 412
f7b422b1
DH		 413/*
414 * Register the NFS filesystems
415 */
416int __init register_nfs_fs(void)
417{
418 int ret;
419
420 ret = register_filesystem(&nfs_fs_type);
421 if (ret < 0)
422 goto error_0;
423
f7b422b1
DH		 424 ret = nfs_register_sysctl();
425 if (ret < 0)
426 goto error_1;
89a09141 427#ifdef CONFIG_NFS_V4
f7b422b1
DH		 428 ret = register_filesystem(&nfs4_fs_type);
429 if (ret < 0)
430 goto error_2;
431#endif
8e1f936b 432 register_shrinker(&acl_shrinker);
f7b422b1
DH		 433 return 0;
434
435#ifdef CONFIG_NFS_V4
436error_2:
437 nfs_unregister_sysctl();
89a09141 438#endif
f7b422b1
DH		 439error_1:
440 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 441error_0:
442 return ret;
443}
444
445/*
446 * Unregister the NFS filesystems
447 */
448void __exit unregister_nfs_fs(void)
449{
8e1f936b 450 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 451#ifdef CONFIG_NFS_V4
452 unregister_filesystem(&nfs4_fs_type);
f7b422b1 453#endif
49af7ee1 454 nfs_unregister_sysctl();
f7b422b1
DH		 455 unregister_filesystem(&nfs_fs_type);
456}
457
1daef0a8 458void nfs_sb_active(struct super_block *sb)
ef818a28 459{
1daef0a8 460 struct nfs_server *server = NFS_SB(sb);
ef818a28 461
1daef0a8
TM		 462 if (atomic_inc_return(&server->active) == 1)
463 atomic_inc(&sb->s_active);
ef818a28
SD		 464}
465
1daef0a8 466void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 467{
468 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 469
470 if (atomic_dec_and_test(&server->active))
471 deactivate_super(sb);
ef818a28
SD		 472}
473
f7b422b1
DH		 474/*
475 * Deliver file system statistics to userspace
476 */
816724e6 477static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 478{
0c7d90cf 479 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 480 unsigned char blockbits;
481 unsigned long blockres;
0c7d90cf 482 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 483 struct nfs_fsstat res;
484 int error = -ENOMEM;
485
486 res.fattr = nfs_alloc_fattr();
487 if (res.fattr == NULL)
488 goto out_err;
f7b422b1 489
8fa5c000 490 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 491 if (unlikely(error == -ESTALE)) {
492 struct dentry *pd_dentry;
493
494 pd_dentry = dget_parent(dentry);
495 if (pd_dentry != NULL) {
496 nfs_zap_caches(pd_dentry->d_inode);
497 dput(pd_dentry);
498 }
499 }
ca7e9a0d 500 nfs_free_fattr(res.fattr);
f7b422b1
DH		 501 if (error < 0)
502 goto out_err;
ca7e9a0d 503
1a0ba9ae 504 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 505
506 /*
507 * Current versions of glibc do not correctly handle the
508 * case where f_frsize != f_bsize. Eventually we want to
509 * report the value of wtmult in this field.
510 */
0c7d90cf 511 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 512
513 /*
514 * On most *nix systems, f_blocks, f_bfree, and f_bavail
515 * are reported in units of f_frsize. Linux hasn't had
516 * an f_frsize field in its statfs struct until recently,
517 * thus historically Linux's sys_statfs reports these
518 * fields in units of f_bsize.
519 */
0c7d90cf
DH		 520 buf->f_bsize = dentry->d_sb->s_blocksize;
521 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 522 blockres = (1 << blockbits) - 1;
523 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
524 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
525 buf->f_bavail = (res.abytes + blockres) >> blockbits;
526
527 buf->f_files = res.tfiles;
528 buf->f_ffree = res.afiles;
529
530 buf->f_namelen = server->namelen;
1a0ba9ae 531
f7b422b1
DH		 532 return 0;
533
534 out_err:
3110ff80 535 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 536 return error;
f7b422b1
DH		 537}
538
7d4e2747
DH		 539/*
540 * Map the security flavour number to a name
541 */
81039f1f
TM		 542static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
543{
7d4e2747 544 static const struct {
81039f1f
TM		 545 rpc_authflavor_t flavour;
546 const char *str;
547 } sec_flavours[] = {
548 { RPC_AUTH_NULL, "null" },
549 { RPC_AUTH_UNIX, "sys" },
550 { RPC_AUTH_GSS_KRB5, "krb5" },
551 { RPC_AUTH_GSS_KRB5I, "krb5i" },
552 { RPC_AUTH_GSS_KRB5P, "krb5p" },
553 { RPC_AUTH_GSS_LKEY, "lkey" },
554 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
555 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
556 { RPC_AUTH_GSS_SPKM, "spkm" },
557 { RPC_AUTH_GSS_SPKMI, "spkmi" },
558 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 559 { UINT_MAX, "unknown" }
81039f1f
TM		 560 };
561 int i;
562
4d81cd16 563 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 564 if (sec_flavours[i].flavour == flavour)
565 break;
566 }
567 return sec_flavours[i].str;
568}
569
ee671b01
JL		 570static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
571 int showdefaults)
572{
573 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
574
575 seq_printf(m, ",mountproto=");
576 switch (sap->sa_family) {
577 case AF_INET:
578 switch (nfss->mountd_protocol) {
579 case IPPROTO_UDP:
580 seq_printf(m, RPCBIND_NETID_UDP);
581 break;
582 case IPPROTO_TCP:
583 seq_printf(m, RPCBIND_NETID_TCP);
584 break;
585 default:
586 if (showdefaults)
587 seq_printf(m, "auto");
588 }
589 break;
590 case AF_INET6:
591 switch (nfss->mountd_protocol) {
592 case IPPROTO_UDP:
593 seq_printf(m, RPCBIND_NETID_UDP6);
594 break;
595 case IPPROTO_TCP:
596 seq_printf(m, RPCBIND_NETID_TCP6);
597 break;
598 default:
599 if (showdefaults)
600 seq_printf(m, "auto");
601 }
602 break;
603 default:
604 if (showdefaults)
605 seq_printf(m, "auto");
606 }
607}
608
82d101d5
CL		 609static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
610 int showdefaults)
611{
612 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
613
d5eff1a3
BS		 614 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
615 return;
616
82d101d5
CL		 617 switch (sap->sa_family) {
618 case AF_INET: {
619 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 620 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 621 break;
622 }
623 case AF_INET6: {
624 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 625 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 626 break;
627 }
628 default:
629 if (showdefaults)
630 seq_printf(m, ",mountaddr=unspecified");
631 }
632
633 if (nfss->mountd_version || showdefaults)
634 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 635 if ((nfss->mountd_port &&
636 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
637 showdefaults)
82d101d5
CL		 638 seq_printf(m, ",mountport=%u", nfss->mountd_port);
639
ee671b01 640 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 641}
642
0be8189f
TM		 643#ifdef CONFIG_NFS_V4
644static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
645 int showdefaults)
646{
647 struct nfs_client *clp = nfss->nfs_client;
648
649 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
0be8189f
TM		 650}
651#else
652static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
653 int showdefaults)
654{
655}
656#endif
657
7bbceb6f
TM		 658static void nfs_show_nfs_version(struct seq_file *m,
659 unsigned int version,
660 unsigned int minorversion)
661{
662 seq_printf(m, ",vers=%u", version);
663 if (version == 4)
664 seq_printf(m, ".%u", minorversion);
665}
666
f7b422b1
DH		 667/*
668 * Describe the mount options in force on this server representation
669 */
82d101d5
CL		 670static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
671 int showdefaults)
f7b422b1 672{
509de811 673 static const struct proc_nfs_info {
f7b422b1 674 int flag;
509de811
DH		 675 const char *str;
676 const char *nostr;
f7b422b1
DH		 677 } nfs_info[] = {
678 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 679 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 680 { NFS_MOUNT_NOCTO, ",nocto", "" },
681 { NFS_MOUNT_NOAC, ",noac", "" },
682 { NFS_MOUNT_NONLM, ",nolock", "" },
683 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 684 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 685 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
686 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 687 { 0, NULL, NULL }
688 };
509de811 689 const struct proc_nfs_info *nfs_infop;
8fa5c000 690 struct nfs_client *clp = nfss->nfs_client;
82d101d5 691 u32 version = clp->rpc_ops->version;
7c563cc9 692 int local_flock, local_fcntl;
f7b422b1 693
7bbceb6f 694 nfs_show_nfs_version(m, version, clp->cl_minorversion);
2d767432
CL		 695 seq_printf(m, ",rsize=%u", nfss->rsize);
696 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 697 if (nfss->bsize != 0)
698 seq_printf(m, ",bsize=%u", nfss->bsize);
699 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 700 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 701 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 702 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 703 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 704 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 705 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 706 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 707 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 708 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
709 if (nfss->flags & nfs_infop->flag)
710 seq_puts(m, nfs_infop->str);
711 else
712 seq_puts(m, nfs_infop->nostr);
713 }
2446ab60 714 rcu_read_lock();
56928edd 715 seq_printf(m, ",proto=%s",
ee671b01 716 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
2446ab60 717 rcu_read_unlock();
82d101d5
CL		 718 if (version == 4) {
719 if (nfss->port != NFS_PORT)
720 seq_printf(m, ",port=%u", nfss->port);
721 } else
722 if (nfss->port)
723 seq_printf(m, ",port=%u", nfss->port);
724
33170233
TM		 725 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
726 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 727 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 728
729 if (version != 4)
730 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 731 else
732 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 733
b797cac7
DH		 734 if (nfss->options & NFS_OPTION_FSCACHE)
735 seq_printf(m, ",fsc");
9b00c643
PL		 736
737 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
738 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
739 seq_printf(m, ",lookupcache=none");
740 else
741 seq_printf(m, ",lookupcache=pos");
742 }
7c563cc9
SJ		 743
744 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
745 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
746
747 if (!local_flock && !local_fcntl)
748 seq_printf(m, ",local_lock=none");
749 else if (local_flock && local_fcntl)
750 seq_printf(m, ",local_lock=all");
751 else if (local_flock)
752 seq_printf(m, ",local_lock=flock");
753 else
754 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 755}
756
757/*
758 * Describe the mount options on this VFS mountpoint
759 */
34c80b1d 760static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 761{
34c80b1d 762 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 763
764 nfs_show_mount_options(m, nfss, 0);
765
2446ab60 766 rcu_read_lock();
5d8515ca
CL		 767 seq_printf(m, ",addr=%s",
768 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
769 RPC_DISPLAY_ADDR));
2446ab60 770 rcu_read_unlock();
f7b422b1
DH		 771
772 return 0;
773}
45402c38
HS		 774
775#ifdef CONFIG_NFS_V4
ae50c0b5 776#ifdef CONFIG_NFS_V4_1
45402c38 777static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 778{
779 if (nfs4_has_session(server->nfs_client))
780 seq_printf(m, ",sessions");
781}
782#else
45402c38
HS		 783static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
784#endif
ae50c0b5
BF		 785#endif
786
787#ifdef CONFIG_NFS_V4_1
45402c38 788static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 789{
790 seq_printf(m, ",pnfs=");
791 if (server->pnfs_curr_ld)
792 seq_printf(m, "%s", server->pnfs_curr_ld->name);
793 else
794 seq_printf(m, "not configured");
795}
7e03b7cc
TM		 796
797static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
798{
59155546
CL		 799 if (nfss->nfs_client && nfss->nfs_client->cl_implid) {
800 struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid;
7e03b7cc
TM		 801 seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s',"
802 "date='%llu,%u'",
803 impl_id->name, impl_id->domain,
804 impl_id->date.seconds, impl_id->date.nseconds);
805 }
806}
45402c38 807#else
7e03b7cc
TM		 808#ifdef CONFIG_NFS_V4
809static void show_pnfs(struct seq_file *m, struct nfs_server *server)
810{
811}
45402c38 812#endif
7e03b7cc
TM		 813static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss)
814{
815}
45402c38 816#endif
f7b422b1 817
d861c630 818static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 819{
820 char *page = (char *) __get_free_page(GFP_KERNEL);
821 char *devname, *dummy;
822 int err = 0;
823 if (!page)
824 return -ENOMEM;
d861c630 825 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 826 if (IS_ERR(devname))
827 err = PTR_ERR(devname);
828 else
829 seq_escape(m, devname, " \t\n\\");
830 free_page((unsigned long)page);
831 return err;
832}
833
a6322de6 834static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 835{
836 seq_puts(m, "/");
837 return 0;
838}
839
f7b422b1
DH		 840/*
841 * Present statistical information for this VFS mountpoint
842 */
64132379 843static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 844{
845 int i, cpu;
64132379 846 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 847 struct rpc_auth *auth = nfss->client->cl_auth;
848 struct nfs_iostats totals = { };
849
850 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
851
852 /*
853 * Display all mount option settings
854 */
855 seq_printf(m, "\n\topts:\t");
64132379
AV		 856 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
857 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
858 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
859 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 860 nfs_show_mount_options(m, nfss, 1);
861
862 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
863
7e03b7cc 864 show_implementation_id(m, nfss);
7d2ed9ac 865
f7b422b1
DH		 866 seq_printf(m, "\n\tcaps:\t");
867 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 868 seq_printf(m, ",wtmult=%u", nfss->wtmult);
869 seq_printf(m, ",dtsize=%u", nfss->dtsize);
870 seq_printf(m, ",bsize=%u", nfss->bsize);
871 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 872
873#ifdef CONFIG_NFS_V4
40c55319 874 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 875 seq_printf(m, "\n\tnfsv4:\t");
876 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
877 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
878 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 879 show_sessions(m, nfss);
880 show_pnfs(m, nfss);
f7b422b1
DH		 881 }
882#endif
883
884 /*
885 * Display security flavor in effect for this mount
886 */
2d767432 887 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 888 if (auth->au_flavor)
2d767432 889 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 890
891 /*
892 * Display superblock I/O counters
893 */
894 for_each_possible_cpu(cpu) {
895 struct nfs_iostats *stats;
896
897 preempt_disable();
898 stats = per_cpu_ptr(nfss->io_stats, cpu);
899
900 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
901 totals.events[i] += stats->events[i];
902 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
903 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 904#ifdef CONFIG_NFS_FSCACHE
905 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
906 totals.fscache[i] += stats->fscache[i];
907#endif
f7b422b1
DH		 908
909 preempt_enable();
910 }
911
912 seq_printf(m, "\n\tevents:\t");
913 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
914 seq_printf(m, "%lu ", totals.events[i]);
915 seq_printf(m, "\n\tbytes:\t");
916 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
917 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 918#ifdef CONFIG_NFS_FSCACHE
919 if (nfss->options & NFS_OPTION_FSCACHE) {
920 seq_printf(m, "\n\tfsc:\t");
921 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
922 seq_printf(m, "%Lu ", totals.bytes[i]);
923 }
924#endif
f7b422b1
DH		 925 seq_printf(m, "\n");
926
927 rpc_print_iostats(m, nfss->client);
928
929 return 0;
930}
931
932/*
933 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 934 * in response to xdev traversals and referrals
f7b422b1 935 */
42faad99 936static void nfs_umount_begin(struct super_block *sb)
f7b422b1 937{
67e55205 938 struct nfs_server *server;
fc6ae3cf
TM		 939 struct rpc_clnt *rpc;
940
67e55205 941 server = NFS_SB(sb);
fc6ae3cf
TM		 942 /* -EIO all pending I/O */
943 rpc = server->client_acl;
944 if (!IS_ERR(rpc))
945 rpc_killall_tasks(rpc);
946 rpc = server->client;
947 if (!IS_ERR(rpc))
948 rpc_killall_tasks(rpc);
f7b422b1
DH		 949}
950
db833351 951static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
9423a08a
CL		 952{
953 struct nfs_parsed_mount_data *data;
954
955 data = kzalloc(sizeof(*data), GFP_KERNEL);
956 if (data) {
9423a08a
CL		 957 data->acregmin = NFS_DEF_ACREGMIN;
958 data->acregmax = NFS_DEF_ACREGMAX;
959 data->acdirmin = NFS_DEF_ACDIRMIN;
960 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 961 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 962 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 963 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 964 data->auth_flavors[0] = RPC_AUTH_UNIX;
965 data->auth_flavor_len = 1;
966 data->minorversion = 0;
b72e4f42 967 data->need_mount = true;
9937347a 968 data->net = current->nsproxy->net_ns;
8a0d551a 969 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 970 }
971 return data;
972}
973
8a0d551a
JL		 974static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
975{
976 if (data) {
977 kfree(data->client_address);
978 kfree(data->mount_server.hostname);
979 kfree(data->nfs_server.export_path);
980 kfree(data->nfs_server.hostname);
981 kfree(data->fscache_uniq);
982 security_free_mnt_opts(&data->lsm_opts);
983 kfree(data);
984 }
985}
986
fc50d58f 987/*
cdcd7f9a
CL		 988 * Sanity-check a server address provided by the mount command.
989 *
990 * Address family must be initialized, and address must not be
991 * the ANY address for that family.
fc50d58f
CL		 992 */
993static int nfs_verify_server_address(struct sockaddr *addr)
994{
995 switch (addr->sa_family) {
996 case AF_INET: {
cdcd7f9a 997 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 998 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 999 }
1000 case AF_INET6: {
1001 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
1002 return !ipv6_addr_any(sa);
fc50d58f
CL		 1003 }
1004 }
1005
53a0b9c4 1006 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 1007 return 0;
1008}
1009
4cfd74fc
CL		 1010/*
1011 * Select between a default port value and a user-specified port value.
1012 * If a zero value is set, then autobind will be used.
1013 */
f5855fec 1014static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 1015 const unsigned short default_port)
1016{
f5855fec
TM		 1017 if (*port == NFS_UNSPEC_PORT)
1018 *port = default_port;
4cfd74fc 1019
f5855fec 1020 rpc_set_port(sap, *port);
4cfd74fc
CL		 1021}
1022
259875ef
TM		 1023/*
1024 * Sanity check the NFS transport protocol.
1025 *
1026 */
1027static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
1028{
1029 switch (mnt->nfs_server.protocol) {
1030 case XPRT_TRANSPORT_UDP:
1031 case XPRT_TRANSPORT_TCP:
1032 case XPRT_TRANSPORT_RDMA:
1033 break;
1034 default:
1035 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1036 }
1037}
1038
1039/*
1040 * For text based NFSv2/v3 mounts, the mount protocol transport default
1041 * settings should depend upon the specified NFS transport.
1042 */
1043static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
1044{
1045 nfs_validate_transport_protocol(mnt);
1046
1047 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
1048 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
1049 return;
1050 switch (mnt->nfs_server.protocol) {
1051 case XPRT_TRANSPORT_UDP:
1052 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1053 break;
1054 case XPRT_TRANSPORT_TCP:
1055 case XPRT_TRANSPORT_RDMA:
1056 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1057 }
1058}
1059
01060c89
CL		 1060/*
1061 * Parse the value of the 'sec=' option.
01060c89
CL		 1062 */
1063static int nfs_parse_security_flavors(char *value,
1064 struct nfs_parsed_mount_data *mnt)
1065{
1066 substring_t args[MAX_OPT_ARGS];
1067
1068 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1069
1070 switch (match_token(value, nfs_secflavor_tokens, args)) {
1071 case Opt_sec_none:
01060c89
CL		 1072 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1073 break;
1074 case Opt_sec_sys:
01060c89
CL		 1075 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1076 break;
1077 case Opt_sec_krb5:
01060c89
CL		 1078 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1079 break;
1080 case Opt_sec_krb5i:
01060c89
CL		 1081 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1082 break;
1083 case Opt_sec_krb5p:
01060c89
CL		 1084 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1085 break;
1086 case Opt_sec_lkey:
01060c89
CL		 1087 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1088 break;
1089 case Opt_sec_lkeyi:
01060c89
CL		 1090 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1091 break;
1092 case Opt_sec_lkeyp:
01060c89
CL		 1093 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1094 break;
1095 case Opt_sec_spkm:
01060c89
CL		 1096 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1097 break;
1098 case Opt_sec_spkmi:
01060c89
CL		 1099 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1100 break;
1101 case Opt_sec_spkmp:
01060c89
CL		 1102 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1103 break;
1104 default:
1105 return 0;
1106 }
1107
9b7160c5 1108 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1109 mnt->auth_flavor_len = 1;
01060c89
CL		 1110 return 1;
1111}
1112
0d71b058
TM		 1113static int nfs_parse_version_string(char *string,
1114 struct nfs_parsed_mount_data *mnt,
1115 substring_t *args)
1116{
1117 mnt->flags &= ~NFS_MOUNT_VER3;
1118 switch (match_token(string, nfs_vers_tokens, args)) {
1119 case Opt_vers_2:
1120 mnt->version = 2;
1121 break;
1122 case Opt_vers_3:
1123 mnt->flags |= NFS_MOUNT_VER3;
1124 mnt->version = 3;
1125 break;
1126 case Opt_vers_4:
1127 /* Backward compatibility option. In future,
1128 * the mount program should always supply
1129 * a NFSv4 minor version number.
1130 */
1131 mnt->version = 4;
1132 break;
1133 case Opt_vers_4_0:
1134 mnt->version = 4;
1135 mnt->minorversion = 0;
1136 break;
1137 case Opt_vers_4_1:
1138 mnt->version = 4;
1139 mnt->minorversion = 1;
1140 break;
1141 default:
1142 return 0;
1143 }
1144 return 1;
1145}
1146
c5cb09b6
RL		 1147static int nfs_get_option_str(substring_t args[], char **option)
1148{
1149 kfree(*option);
1150 *option = match_strdup(args);
1151 return !option;
1152}
1153
1154static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1155{
1156 int rc;
1157 char *string;
1158
1159 string = match_strdup(args);
1160 if (string == NULL)
1161 return -ENOMEM;
1162 rc = strict_strtoul(string, 10, option);
1163 kfree(string);
1164
1165 return rc;
1166}
1167
bf0fd768
CL		 1168/*
1169 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1170 * a data structure. The whole mount string is processed; bad options are
1171 * skipped as they are encountered. If there were no errors, return 1;
1172 * otherwise return 0 (zero).
bf0fd768
CL		 1173 */
1174static int nfs_parse_mount_options(char *raw,
1175 struct nfs_parsed_mount_data *mnt)
1176{
f9c3a380 1177 char *p, *string, *secdata;
d23c45fd 1178 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1179 unsigned short protofamily = AF_UNSPEC;
1180 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1181
1182 if (!raw) {
1183 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1184 return 1;
1185 }
1186 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1187
f9c3a380
EP		 1188 secdata = alloc_secdata();
1189 if (!secdata)
1190 goto out_nomem;
1191
1192 rc = security_sb_copy_data(raw, secdata);
1193 if (rc)
1194 goto out_security_failure;
1195
1196 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1197 if (rc)
1198 goto out_security_failure;
1199
1200 free_secdata(secdata);
1201
bf0fd768
CL		 1202 while ((p = strsep(&raw, ",")) != NULL) {
1203 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1204 unsigned long option;
1205 int token;
bf0fd768
CL		 1206
1207 if (!*p)
1208 continue;
1209
1210 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1211
1212 token = match_token(p, nfs_mount_option_tokens, args);
1213 switch (token) {
f45663ce
CL		 1214
1215 /*
1216 * boolean options: foo/nofoo
1217 */
bf0fd768
CL		 1218 case Opt_soft:
1219 mnt->flags |= NFS_MOUNT_SOFT;
1220 break;
1221 case Opt_hard:
1222 mnt->flags &= ~NFS_MOUNT_SOFT;
1223 break;
bf0fd768
CL		 1224 case Opt_posix:
1225 mnt->flags |= NFS_MOUNT_POSIX;
1226 break;
1227 case Opt_noposix:
1228 mnt->flags &= ~NFS_MOUNT_POSIX;
1229 break;
1230 case Opt_cto:
1231 mnt->flags &= ~NFS_MOUNT_NOCTO;
1232 break;
1233 case Opt_nocto:
1234 mnt->flags |= NFS_MOUNT_NOCTO;
1235 break;
1236 case Opt_ac:
1237 mnt->flags &= ~NFS_MOUNT_NOAC;
1238 break;
1239 case Opt_noac:
1240 mnt->flags |= NFS_MOUNT_NOAC;
1241 break;
1242 case Opt_lock:
1243 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1244 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1245 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1246 break;
1247 case Opt_nolock:
1248 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1249 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1250 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768 1251 break;
bf0fd768
CL		 1252 case Opt_udp:
1253 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1254 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1255 break;
1256 case Opt_tcp:
1257 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1258 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1259 break;
2cf7ff7a
TT		 1260 case Opt_rdma:
1261 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1262 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1263 xprt_load_transport(p);
2cf7ff7a 1264 break;
bf0fd768
CL		 1265 case Opt_acl:
1266 mnt->flags &= ~NFS_MOUNT_NOACL;
1267 break;
1268 case Opt_noacl:
1269 mnt->flags |= NFS_MOUNT_NOACL;
1270 break;
1271 case Opt_rdirplus:
1272 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1273 break;
1274 case Opt_nordirplus:
1275 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1276 break;
75180df2
TM		 1277 case Opt_sharecache:
1278 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1279 break;
1280 case Opt_nosharecache:
1281 mnt->flags |= NFS_MOUNT_UNSHARED;
1282 break;
d740351b
CL		 1283 case Opt_resvport:
1284 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1285 break;
1286 case Opt_noresvport:
1287 mnt->flags |= NFS_MOUNT_NORESVPORT;
1288 break;
b797cac7
DH		 1289 case Opt_fscache:
1290 mnt->options |= NFS_OPTION_FSCACHE;
1291 kfree(mnt->fscache_uniq);
1292 mnt->fscache_uniq = NULL;
1293 break;
1294 case Opt_nofscache:
1295 mnt->options &= ~NFS_OPTION_FSCACHE;
1296 kfree(mnt->fscache_uniq);
1297 mnt->fscache_uniq = NULL;
1298 break;
bf0fd768 1299
f45663ce
CL		 1300 /*
1301 * options that take numeric values
1302 */
bf0fd768 1303 case Opt_port:
c5cb09b6
RL		 1304 if (nfs_get_option_ul(args, &option) ||
1305 option > USHRT_MAX)
d23c45fd
CL		 1306 goto out_invalid_value;
1307 mnt->nfs_server.port = option;
bf0fd768
CL		 1308 break;
1309 case Opt_rsize:
c5cb09b6 1310 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1311 goto out_invalid_value;
1312 mnt->rsize = option;
bf0fd768
CL		 1313 break;
1314 case Opt_wsize:
c5cb09b6 1315 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1316 goto out_invalid_value;
1317 mnt->wsize = option;
bf0fd768
CL		 1318 break;
1319 case Opt_bsize:
c5cb09b6 1320 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1321 goto out_invalid_value;
1322 mnt->bsize = option;
bf0fd768
CL		 1323 break;
1324 case Opt_timeo:
c5cb09b6 1325 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1326 goto out_invalid_value;
1327 mnt->timeo = option;
bf0fd768
CL		 1328 break;
1329 case Opt_retrans:
c5cb09b6 1330 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1331 goto out_invalid_value;
1332 mnt->retrans = option;
bf0fd768
CL		 1333 break;
1334 case Opt_acregmin:
c5cb09b6 1335 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1336 goto out_invalid_value;
1337 mnt->acregmin = option;
bf0fd768
CL		 1338 break;
1339 case Opt_acregmax:
c5cb09b6 1340 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1341 goto out_invalid_value;
1342 mnt->acregmax = option;
bf0fd768
CL		 1343 break;
1344 case Opt_acdirmin:
c5cb09b6 1345 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1346 goto out_invalid_value;
1347 mnt->acdirmin = option;
bf0fd768
CL		 1348 break;
1349 case Opt_acdirmax:
c5cb09b6 1350 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1351 goto out_invalid_value;
1352 mnt->acdirmax = option;
bf0fd768
CL		 1353 break;
1354 case Opt_actimeo:
c5cb09b6 1355 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1356 goto out_invalid_value;
1357 mnt->acregmin = mnt->acregmax =
1358 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1359 break;
1360 case Opt_namelen:
c5cb09b6 1361 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1362 goto out_invalid_value;
1363 mnt->namlen = option;
bf0fd768
CL		 1364 break;
1365 case Opt_mountport:
c5cb09b6
RL		 1366 if (nfs_get_option_ul(args, &option) ||
1367 option > USHRT_MAX)
d23c45fd
CL		 1368 goto out_invalid_value;
1369 mnt->mount_server.port = option;
bf0fd768 1370 break;
bf0fd768 1371 case Opt_mountvers:
c5cb09b6 1372 if (nfs_get_option_ul(args, &option) ||
f45663ce 1373 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1374 option > NFS_MNT3_VERSION)
1375 goto out_invalid_value;
1376 mnt->mount_server.version = option;
bf0fd768 1377 break;
3fd5be9e 1378 case Opt_minorversion:
c5cb09b6 1379 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1380 goto out_invalid_value;
1381 if (option > NFS4_MAX_MINOR_VERSION)
1382 goto out_invalid_value;
1383 mnt->minorversion = option;
3fd5be9e 1384 break;
bf0fd768 1385
f45663ce
CL		 1386 /*
1387 * options that take text values
1388 */
0d71b058
TM		 1389 case Opt_nfsvers:
1390 string = match_strdup(args);
1391 if (string == NULL)
1392 goto out_nomem;
1393 rc = nfs_parse_version_string(string, mnt, args);
1394 kfree(string);
1395 if (!rc)
1396 goto out_invalid_value;
1397 break;
bf0fd768
CL		 1398 case Opt_sec:
1399 string = match_strdup(args);
1400 if (string == NULL)
1401 goto out_nomem;
01060c89 1402 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1403 kfree(string);
f45663ce 1404 if (!rc) {
f45663ce
CL		 1405 dfprintk(MOUNT, "NFS: unrecognized "
1406 "security flavor\n");
d23c45fd 1407 return 0;
f45663ce 1408 }
bf0fd768
CL		 1409 break;
1410 case Opt_proto:
1411 string = match_strdup(args);
1412 if (string == NULL)
1413 goto out_nomem;
1414 token = match_token(string,
1415 nfs_xprt_protocol_tokens, args);
bf0fd768 1416
ee671b01 1417 protofamily = AF_INET;
bf0fd768 1418 switch (token) {
ee671b01
JL		 1419 case Opt_xprt_udp6:
1420 protofamily = AF_INET6;
fdb66ff4 1421 case Opt_xprt_udp:
bf0fd768 1422 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1423 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1424 break;
ee671b01
JL		 1425 case Opt_xprt_tcp6:
1426 protofamily = AF_INET6;
fdb66ff4 1427 case Opt_xprt_tcp:
bf0fd768 1428 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1429 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1430 break;
2cf7ff7a
TT		 1431 case Opt_xprt_rdma:
1432 /* vector side protocols to TCP */
1433 mnt->flags |= NFS_MOUNT_TCP;
1434 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1435 xprt_load_transport(string);
2cf7ff7a 1436 break;
bf0fd768 1437 default:
f45663ce
CL		 1438 dfprintk(MOUNT, "NFS: unrecognized "
1439 "transport protocol\n");
4223a4a1 1440 kfree(string);
d23c45fd 1441 return 0;
bf0fd768 1442 }
c5cb09b6 1443 kfree(string);
bf0fd768
CL		 1444 break;
1445 case Opt_mountproto:
1446 string = match_strdup(args);
1447 if (string == NULL)
1448 goto out_nomem;
1449 token = match_token(string,
1450 nfs_xprt_protocol_tokens, args);
d508afb4 1451 kfree(string);
bf0fd768 1452
ee671b01 1453 mountfamily = AF_INET;
bf0fd768 1454 switch (token) {
ee671b01
JL		 1455 case Opt_xprt_udp6:
1456 mountfamily = AF_INET6;
fdb66ff4 1457 case Opt_xprt_udp:
0896a725 1458 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1459 break;
ee671b01
JL		 1460 case Opt_xprt_tcp6:
1461 mountfamily = AF_INET6;
fdb66ff4 1462 case Opt_xprt_tcp:
0896a725 1463 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1464 break;
2cf7ff7a 1465 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1466 default:
f45663ce
CL		 1467 dfprintk(MOUNT, "NFS: unrecognized "
1468 "transport protocol\n");
d23c45fd 1469 return 0;
bf0fd768
CL		 1470 }
1471 break;
1472 case Opt_addr:
1473 string = match_strdup(args);
1474 if (string == NULL)
1475 goto out_nomem;
53a0b9c4 1476 mnt->nfs_server.addrlen =
b48e1278 1477 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1478 (struct sockaddr *)
1479 &mnt->nfs_server.address,
1480 sizeof(mnt->nfs_server.address));
bf0fd768 1481 kfree(string);
53a0b9c4
CL		 1482 if (mnt->nfs_server.addrlen == 0)
1483 goto out_invalid_address;
bf0fd768
CL		 1484 break;
1485 case Opt_clientaddr:
c5cb09b6 1486 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1487 goto out_nomem;
bf0fd768 1488 break;
33832034 1489 case Opt_mounthost:
c5cb09b6
RL		 1490 if (nfs_get_option_str(args,
1491 &mnt->mount_server.hostname))
33832034 1492 goto out_nomem;
33832034 1493 break;
0ac83779 1494 case Opt_mountaddr:
bf0fd768
CL		 1495 string = match_strdup(args);
1496 if (string == NULL)
1497 goto out_nomem;
53a0b9c4 1498 mnt->mount_server.addrlen =
b48e1278 1499 rpc_pton(mnt->net, string, strlen(string),
53a0b9c4
CL		 1500 (struct sockaddr *)
1501 &mnt->mount_server.address,
1502 sizeof(mnt->mount_server.address));
bf0fd768 1503 kfree(string);
53a0b9c4
CL		 1504 if (mnt->mount_server.addrlen == 0)
1505 goto out_invalid_address;
bf0fd768 1506 break;
7973c1f1
TM		 1507 case Opt_lookupcache:
1508 string = match_strdup(args);
1509 if (string == NULL)
1510 goto out_nomem;
1511 token = match_token(string,
1512 nfs_lookupcache_tokens, args);
1513 kfree(string);
1514 switch (token) {
1515 case Opt_lookupcache_all:
1516 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1517 break;
1518 case Opt_lookupcache_positive:
1519 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1520 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1521 break;
1522 case Opt_lookupcache_none:
1523 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1524 break;
1525 default:
7973c1f1
TM		 1526 dfprintk(MOUNT, "NFS: invalid "
1527 "lookupcache argument\n");
d23c45fd 1528 return 0;
7973c1f1
TM		 1529 };
1530 break;
a6d5ff64 1531 case Opt_fscache_uniq:
c5cb09b6 1532 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1533 goto out_nomem;
a6d5ff64
CL		 1534 mnt->options |= NFS_OPTION_FSCACHE;
1535 break;
5eebde23
SJ		 1536 case Opt_local_lock:
1537 string = match_strdup(args);
1538 if (string == NULL)
1539 goto out_nomem;
1540 token = match_token(string, nfs_local_lock_tokens,
1541 args);
1542 kfree(string);
1543 switch (token) {
1544 case Opt_local_lock_all:
1545 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1546 NFS_MOUNT_LOCAL_FCNTL);
1547 break;
1548 case Opt_local_lock_flock:
1549 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1550 break;
1551 case Opt_local_lock_posix:
1552 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1553 break;
1554 case Opt_local_lock_none:
1555 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1556 NFS_MOUNT_LOCAL_FCNTL);
1557 break;
1558 default:
1559 dfprintk(MOUNT, "NFS: invalid "
1560 "local_lock argument\n");
1561 return 0;
1562 };
1563 break;
bf0fd768 1564
f45663ce
CL		 1565 /*
1566 * Special options
1567 */
1568 case Opt_sloppy:
1569 sloppy = 1;
1570 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1571 break;
bf0fd768
CL		 1572 case Opt_userspace:
1573 case Opt_deprecated:
d33e4dfe
CL		 1574 dfprintk(MOUNT, "NFS: ignoring mount option "
1575 "'%s'\n", p);
bf0fd768
CL		 1576 break;
1577
1578 default:
d23c45fd 1579 invalid_option = 1;
f45663ce
CL		 1580 dfprintk(MOUNT, "NFS: unrecognized mount option "
1581 "'%s'\n", p);
bf0fd768
CL		 1582 }
1583 }
1584
d23c45fd
CL		 1585 if (!sloppy && invalid_option)
1586 return 0;
1587
571b7554
WAA		 1588 if (mnt->minorversion && mnt->version != 4)
1589 goto out_minorversion_mismatch;
1590
ee671b01
JL		 1591 /*
1592 * verify that any proto=/mountproto= options match the address
1593 * familiies in the addr=/mountaddr= options.
1594 */
1595 if (protofamily != AF_UNSPEC &&
1596 protofamily != mnt->nfs_server.address.ss_family)
1597 goto out_proto_mismatch;
1598
1599 if (mountfamily != AF_UNSPEC) {
1600 if (mnt->mount_server.addrlen) {
1601 if (mountfamily != mnt->mount_server.address.ss_family)
1602 goto out_mountproto_mismatch;
1603 } else {
1604 if (mountfamily != mnt->nfs_server.address.ss_family)
1605 goto out_mountproto_mismatch;
1606 }
1607 }
1608
bf0fd768
CL		 1609 return 1;
1610
ee671b01
JL		 1611out_mountproto_mismatch:
1612 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1613 "option\n");
1614 return 0;
1615out_proto_mismatch:
1616 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1617 return 0;
53a0b9c4
CL		 1618out_invalid_address:
1619 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1620 return 0;
d23c45fd 1621out_invalid_value:
53a0b9c4 1622 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1623 return 0;
571b7554
WAA		 1624out_minorversion_mismatch:
1625 printk(KERN_INFO "NFS: mount option vers=%u does not support "
1626 "minorversion=%u\n", mnt->version, mnt->minorversion);
1627 return 0;
bf0fd768
CL		 1628out_nomem:
1629 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1630 return 0;
f9c3a380
EP		 1631out_security_failure:
1632 free_secdata(secdata);
1633 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1634 return 0;
bf0fd768
CL		 1635}
1636
ec88f28d
CL		 1637/*
1638 * Match the requested auth flavors with the list returned by
1639 * the server. Returns zero and sets the mount's authentication
1640 * flavor on success; returns -EACCES if server does not support
1641 * the requested flavor.
1642 */
1643static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1644 struct nfs_mount_request *request)
1645{
1646 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1647
5eecfde6
CL		 1648 /*
1649 * Certain releases of Linux's mountd return an empty
1650 * flavor list. To prevent behavioral regression with
1651 * these servers (ie. rejecting mounts that used to
1652 * succeed), revert to pre-2.6.32 behavior (no checking)
1653 * if the returned flavor list is empty.
1654 */
1655 if (server_authlist_len == 0)
1656 return 0;
1657
ec88f28d
CL		 1658 /*
1659 * We avoid sophisticated negotiating here, as there are
1660 * plenty of cases where we can get it wrong, providing
1661 * either too little or too much security.
1662 *
1663 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1664 * flavor listed first. However, some servers list
1665 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1666 * preferred default, in args->auth_flavors[0] if user
1667 * didn't specify sec= mount option.
1668 */
1669 for (i = 0; i < args->auth_flavor_len; i++)
1670 for (j = 0; j < server_authlist_len; j++)
1671 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1672 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1673 request->auth_flavs[j]);
1674 args->auth_flavors[0] = request->auth_flavs[j];
1675 return 0;
1676 }
1677
1678 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1679 nfs_umount(request);
1680 return -EACCES;
1681}
1682
0076d7b7
CL		 1683/*
1684 * Use the remote server's MOUNT service to request the NFS file handle
1685 * corresponding to the provided path.
1686 */
486aa699
BS		 1687static int nfs_request_mount(struct nfs_parsed_mount_data *args,
1688 struct nfs_fh *root_fh)
0076d7b7 1689{
ec88f28d
CL		 1690 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1691 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1692 struct nfs_mount_request request = {
1693 .sap = (struct sockaddr *)
1694 &args->mount_server.address,
1695 .dirpath = args->nfs_server.export_path,
1696 .protocol = args->mount_server.protocol,
1697 .fh = root_fh,
50a737f8 1698 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1699 .auth_flav_len = &server_authlist_len,
1700 .auth_flavs = server_authlist,
6d59b8d5 1701 .net = args->net,
c5d120f8 1702 };
4c568017 1703 int status;
0076d7b7
CL		 1704
1705 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1706 switch (args->version) {
1707 default:
1708 args->mount_server.version = NFS_MNT3_VERSION;
1709 break;
1710 case 2:
1711 args->mount_server.version = NFS_MNT_VERSION;
1712 }
0076d7b7 1713 }
c5d120f8 1714 request.version = args->mount_server.version;
0076d7b7 1715
33832034 1716 if (args->mount_server.hostname)
c5d120f8 1717 request.hostname = args->mount_server.hostname;
33832034 1718 else
c5d120f8 1719 request.hostname = args->nfs_server.hostname;
33832034 1720
0076d7b7
CL		 1721 /*
1722 * Construct the mount server's address.
1723 */
4c568017 1724 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1725 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1726 args->nfs_server.addrlen);
1727 args->mount_server.addrlen = args->nfs_server.addrlen;
1728 }
c5d120f8 1729 request.salen = args->mount_server.addrlen;
f5855fec 1730 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1731
1732 /*
1733 * Now ask the mount server to map our export path
1734 * to a file handle.
1735 */
c5d120f8 1736 status = nfs_mount(&request);
ec88f28d
CL		 1737 if (status != 0) {
1738 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1739 request.hostname, status);
1740 return status;
1741 }
0076d7b7 1742
ec88f28d
CL		 1743 /*
1744 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1745 */
1746 if (args->mount_server.version != NFS_MNT3_VERSION)
1747 return 0;
1748 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1749}
1750
486aa699 1751static struct dentry *nfs_try_mount(int flags, const char *dev_name,
486aa699
BS		 1752 struct nfs_mount_info *mount_info)
1753{
1754 int status;
1755 struct nfs_server *server;
1756
b72e4f42 1757 if (mount_info->parsed->need_mount) {
87c7083d 1758 status = nfs_request_mount(mount_info->parsed, mount_info->mntfh);
b72e4f42
BS		 1759 if (status)
1760 return ERR_PTR(status);
1761 }
486aa699
BS		 1762
1763 /* Get a volume representation */
87c7083d 1764 server = nfs_create_server(mount_info->parsed, mount_info->mntfh);
486aa699
BS		 1765 if (IS_ERR(server))
1766 return ERR_CAST(server);
1767
87c7083d 1768 return nfs_fs_mount_common(&nfs_fs_type, server, flags, dev_name, mount_info);
486aa699
BS		 1769}
1770
c12bacec
RL		 1771/*
1772 * Split "dev_name" into "hostname:export_path".
1773 *
1774 * The leftmost colon demarks the split between the server's hostname
1775 * and the export path. If the hostname starts with a left square
1776 * bracket, then it may contain colons.
1777 *
1778 * Note: caller frees hostname and export path, even on error.
1779 */
1780static int nfs_parse_devname(const char *dev_name,
1781 char **hostname, size_t maxnamlen,
1782 char **export_path, size_t maxpathlen)
dc045898
CL		 1783{
1784 size_t len;
c12bacec 1785 char *end;
dc045898 1786
c12bacec
RL		 1787 /* Is the host name protected with square brakcets? */
1788 if (*dev_name == '[') {
1789 end = strchr(++dev_name, ']');
1790 if (end == NULL || end[1] != ':')
dc045898 1791 goto out_bad_devname;
dc045898 1792
c12bacec
RL		 1793 len = end - dev_name;
1794 end++;
1795 } else {
1796 char *comma;
dc045898 1797
c12bacec
RL		 1798 end = strchr(dev_name, ':');
1799 if (end == NULL)
1800 goto out_bad_devname;
1801 len = end - dev_name;
d1aa0825 1802
c12bacec
RL		 1803 /* kill possible hostname list: not supported */
1804 comma = strchr(dev_name, ',');
1805 if (comma != NULL && comma < end)
1806 *comma = 0;
1807 }
d1aa0825 1808
d1aa0825
CL		 1809 if (len > maxnamlen)
1810 goto out_hostname;
1811
1812 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1813 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1814 if (*hostname == NULL)
1815 goto out_nomem;
c12bacec 1816 len = strlen(++end);
d1aa0825
CL		 1817 if (len > maxpathlen)
1818 goto out_path;
1819 *export_path = kstrndup(end, len, GFP_KERNEL);
1820 if (!*export_path)
1821 goto out_nomem;
1822
c12bacec 1823 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1824 return 0;
1825
1826out_bad_devname:
1827 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1828 return -EINVAL;
1829
1830out_nomem:
1831 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1832 return -ENOMEM;
1833
1834out_hostname:
1835 dfprintk(MOUNT, "NFS: server hostname too long\n");
1836 return -ENAMETOOLONG;
1837
1838out_path:
1839 dfprintk(MOUNT, "NFS: export pathname too long\n");
1840 return -ENAMETOOLONG;
1841}
1842
f7b422b1 1843/*
54ceac45
DH		 1844 * Validate the NFS2/NFS3 mount data
1845 * - fills in the mount root filehandle
136d558c
CL		 1846 *
1847 * For option strings, user space handles the following behaviors:
1848 *
1849 * + DNS: mapping server host name to IP address ("addr=" option)
1850 *
1851 * + failure mode: how to behave if a mount request can't be handled
1852 * immediately ("fg/bg" option)
1853 *
1854 * + retry: how often to retry a mount request ("retry=" option)
1855 *
1856 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1857 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1858 */
d72c727c
BS		 1859static int nfs23_validate_mount_data(void *options,
1860 struct nfs_parsed_mount_data *args,
1861 struct nfs_fh *mntfh,
1862 const char *dev_name)
f7b422b1 1863{
2283f8d6 1864 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1865 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1866
5df36e78
CL		 1867 if (data == NULL)
1868 goto out_no_data;
f7b422b1 1869
54ceac45 1870 switch (data->version) {
5df36e78
CL		 1871 case 1:
1872 data->namlen = 0;
1873 case 2:
1874 data->bsize = 0;
1875 case 3:
1876 if (data->flags & NFS_MOUNT_VER3)
1877 goto out_no_v3;
1878 data->root.size = NFS2_FHSIZE;
1879 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1880 case 4:
1881 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1882 goto out_no_sec;
1883 case 5:
1884 memset(data->context, 0, sizeof(data->context));
1885 case 6:
b7e24457
TM		 1886 if (data->flags & NFS_MOUNT_VER3) {
1887 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1888 goto out_invalid_fh;
5df36e78 1889 mntfh->size = data->root.size;
764302cc
CL		 1890 args->version = 3;
1891 } else {
5df36e78 1892 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1893 args->version = 2;
1894 }
5df36e78 1895
5df36e78
CL		 1896
1897 memcpy(mntfh->data, data->root.data, mntfh->size);
1898 if (mntfh->size < sizeof(mntfh->data))
1899 memset(mntfh->data + mntfh->size, 0,
1900 sizeof(mntfh->data) - mntfh->size);
6e88e061 1901
2283f8d6
TT		 1902 /*
1903 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1904 * can deal with.
1905 */
ff3525a5 1906 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1907 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1908 args->rsize = data->rsize;
1909 args->wsize = data->wsize;
2283f8d6
TT		 1910 args->timeo = data->timeo;
1911 args->retrans = data->retrans;
1912 args->acregmin = data->acregmin;
1913 args->acregmax = data->acregmax;
1914 args->acdirmin = data->acdirmin;
1915 args->acdirmax = data->acdirmax;
b72e4f42 1916 args->need_mount = false;
4c568017 1917
4cfd74fc 1918 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1919 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1920 if (!nfs_verify_server_address(sap))
4c568017
CL		 1921 goto out_no_address;
1922
2283f8d6 1923 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1924 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1925 /* N.B. caller will free nfs_server.hostname in all cases */
1926 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1927 args->namlen = data->namlen;
1928 args->bsize = data->bsize;
dd07c947
CL		 1929
1930 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1931 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1932 if (!args->nfs_server.hostname)
1933 goto out_nomem;
f9c3a380 1934
5eebde23
SJ		 1935 if (!(data->flags & NFS_MOUNT_NONLM))
1936 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1937 NFS_MOUNT_LOCAL_FCNTL);
1938 else
1939 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1940 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1941 /*
1942 * The legacy version 6 binary mount data from userspace has a
1943 * field used only to transport selinux information into the
1944 * the kernel. To continue to support that functionality we
1945 * have a touch of selinux knowledge here in the NFS code. The
1946 * userspace code converted context=blah to just blah so we are
1947 * converting back to the full string selinux understands.
1948 */
1949 if (data->context[0]){
1950#ifdef CONFIG_SECURITY_SELINUX
1951 int rc;
1952 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1953 if (!opts_str)
1954 return -ENOMEM;
1955 strcpy(opts_str, "context=");
1956 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1957 strcat(opts_str, &data->context[0]);
1958 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1959 kfree(opts_str);
1960 if (rc)
1961 return rc;
1962#else
1963 return -EINVAL;
1964#endif
1965 }
1966
5df36e78 1967 break;
b72e4f42
BS		 1968 default:
1969 return NFS_TEXT_DATA;
f7b422b1 1970 }
54ceac45
DH		 1971
1972#ifndef CONFIG_NFS_V3
8a6e5deb 1973 if (args->version == 3)
5df36e78
CL		 1974 goto out_v3_not_compiled;
1975#endif /* !CONFIG_NFS_V3 */
f7b422b1 1976
5df36e78 1977 return 0;
f7b422b1 1978
5df36e78
CL		 1979out_no_data:
1980 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1981 return -EINVAL;
54ceac45 1982
5df36e78
CL		 1983out_no_v3:
1984 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1985 data->version);
1986 return -EINVAL;
f7b422b1 1987
5df36e78
CL		 1988out_no_sec:
1989 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1990 return -EINVAL;
1991
5df36e78
CL		 1992#ifndef CONFIG_NFS_V3
1993out_v3_not_compiled:
1994 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1995 return -EPROTONOSUPPORT;
1996#endif /* !CONFIG_NFS_V3 */
1997
63649bd7
CG		 1998out_nomem:
1999 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
2000 return -ENOMEM;
2001
5df36e78
CL		 2002out_no_address:
2003 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2004 return -EINVAL;
2005
2006out_invalid_fh:
2007 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
2008 return -EINVAL;
f7b422b1
DH		 2009}
2010
d72c727c
BS		 2011#ifdef CONFIG_NFS_V4
2012static int nfs_validate_mount_data(struct file_system_type *fs_type,
2013 void *options,
2014 struct nfs_parsed_mount_data *args,
2015 struct nfs_fh *mntfh,
2016 const char *dev_name)
2017{
2018 if (fs_type == &nfs_fs_type)
2019 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2020 return nfs4_validate_mount_data(options, args, dev_name);
2021}
2022#else
2023static int nfs_validate_mount_data(struct file_system_type *fs_type,
2024 void *options,
2025 struct nfs_parsed_mount_data *args,
2026 struct nfs_fh *mntfh,
2027 const char *dev_name)
2028{
2029 return nfs23_validate_mount_data(options, args, mntfh, dev_name);
2030}
2031#endif
2032
b72e4f42
BS		 2033static int nfs_validate_text_mount_data(void *options,
2034 struct nfs_parsed_mount_data *args,
2035 const char *dev_name)
2036{
2037 int port = 0;
2038 int max_namelen = PAGE_SIZE;
2039 int max_pathlen = NFS_MAXPATHLEN;
2040 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2041
2042 if (nfs_parse_mount_options((char *)options, args) == 0)
2043 return -EINVAL;
2044
2045 if (!nfs_verify_server_address(sap))
2046 goto out_no_address;
2047
2048 if (args->version == 4) {
2049#ifdef CONFIG_NFS_V4
2050 port = NFS_PORT;
2051 max_namelen = NFS4_MAXNAMLEN;
2052 max_pathlen = NFS4_MAXPATHLEN;
2053 nfs_validate_transport_protocol(args);
2054 nfs4_validate_mount_flags(args);
2055#else
2056 goto out_v4_not_compiled;
2057#endif /* CONFIG_NFS_V4 */
2058 } else
2059 nfs_set_mount_transport_protocol(args);
2060
2061 nfs_set_port(sap, &args->nfs_server.port, port);
2062
2063 if (args->auth_flavor_len > 1)
2064 goto out_bad_auth;
2065
2066 return nfs_parse_devname(dev_name,
2067 &args->nfs_server.hostname,
2068 max_namelen,
2069 &args->nfs_server.export_path,
2070 max_pathlen);
2071
2072#ifndef CONFIG_NFS_V4
2073out_v4_not_compiled:
2074 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
2075 return -EPROTONOSUPPORT;
2076#endif /* !CONFIG_NFS_V4 */
2077
2078out_no_address:
2079 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
2080 return -EINVAL;
2081
2082out_bad_auth:
2083 dfprintk(MOUNT, "NFS: Too many RPC auth flavours specified\n");
2084 return -EINVAL;
2085}
2086
48b605f8
JL		 2087static int
2088nfs_compare_remount_data(struct nfs_server *nfss,
2089 struct nfs_parsed_mount_data *data)
2090{
2091 if (data->flags != nfss->flags ||
2092 data->rsize != nfss->rsize ||
2093 data->wsize != nfss->wsize ||
2094 data->retrans != nfss->client->cl_timeout->to_retries ||
2095 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
2096 data->acregmin != nfss->acregmin / HZ ||
2097 data->acregmax != nfss->acregmax / HZ ||
2098 data->acdirmin != nfss->acdirmin / HZ ||
2099 data->acdirmax != nfss->acdirmax / HZ ||
2100 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 2101 data->nfs_server.port != nfss->port ||
48b605f8 2102 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 2103 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
2104 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 2105 return -EINVAL;
2106
2107 return 0;
2108}
2109
2110static int
2111nfs_remount(struct super_block *sb, int *flags, char *raw_data)
2112{
2113 int error;
2114 struct nfs_server *nfss = sb->s_fs_info;
2115 struct nfs_parsed_mount_data *data;
2116 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
2117 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 2118 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 2119
2120 /*
2121 * Userspace mount programs that send binary options generally send
2122 * them populated with default values. We have no way to know which
2123 * ones were explicitly specified. Fall back to legacy behavior and
2124 * just return success.
2125 */
31c94469
MZ		 2126 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
2127 (nfsvers <= 3 && (!options || (options->version >= 1 &&
2128 options->version <= 6))))
48b605f8
JL		 2129 return 0;
2130
2131 data = kzalloc(sizeof(*data), GFP_KERNEL);
2132 if (data == NULL)
2133 return -ENOMEM;
2134
2135 /* fill out struct with values from existing mount */
2136 data->flags = nfss->flags;
2137 data->rsize = nfss->rsize;
2138 data->wsize = nfss->wsize;
2139 data->retrans = nfss->client->cl_timeout->to_retries;
2140 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2141 data->acregmin = nfss->acregmin / HZ;
2142 data->acregmax = nfss->acregmax / HZ;
2143 data->acdirmin = nfss->acdirmin / HZ;
2144 data->acdirmax = nfss->acdirmax / HZ;
2145 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2146 data->nfs_server.port = nfss->port;
48b605f8
JL		 2147 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2148 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2149 data->nfs_server.addrlen);
2150
2151 /* overwrite those values with any that were specified */
2152 error = nfs_parse_mount_options((char *)options, data);
2153 if (error < 0)
2154 goto out;
2155
26c4c170
JL		 2156 /*
2157 * noac is a special case. It implies -o sync, but that's not
2158 * necessarily reflected in the mtab options. do_remount_sb
2159 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2160 * remount options, so we have to explicitly reset it.
2161 */
2162 if (data->flags & NFS_MOUNT_NOAC)
2163 *flags |= MS_SYNCHRONOUS;
2164
48b605f8
JL		 2165 /* compare new mount options with old ones */
2166 error = nfs_compare_remount_data(nfss, data);
2167out:
2168 kfree(data);
2169 return error;
2170}
2171
f7b422b1 2172/*
54ceac45 2173 * Initialise the common bits of the superblock
f7b422b1 2174 */
54ceac45 2175static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2176{
54ceac45 2177 struct nfs_server *server = NFS_SB(sb);
5006a76c 2178
54ceac45 2179 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2180
54ceac45
DH		 2181 /* We probably want something more informative here */
2182 snprintf(sb->s_id, sizeof(sb->s_id),
5a7c9eec 2183 "%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2184
54ceac45
DH		 2185 if (sb->s_blocksize == 0)
2186 sb->s_blocksize = nfs_block_bits(server->wsize,
2187 &sb->s_blocksize_bits);
f7b422b1 2188
32a88aa1
JA		 2189 sb->s_bdi = &server->backing_dev_info;
2190
54ceac45 2191 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2192}
2193
2194/*
54ceac45 2195 * Finish setting up an NFS2/3 superblock
f7b422b1 2196 */
2283f8d6 2197static void nfs_fill_super(struct super_block *sb,
c40f8d1d 2198 struct nfs_mount_info *mount_info)
f7b422b1 2199{
c40f8d1d 2200 struct nfs_parsed_mount_data *data = mount_info->parsed;
f7b422b1 2201 struct nfs_server *server = NFS_SB(sb);
5006a76c 2202
54ceac45
DH		 2203 sb->s_blocksize_bits = 0;
2204 sb->s_blocksize = 0;
2205 if (data->bsize)
2206 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2207
8a6e5deb 2208 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2209 /* The VFS shouldn't apply the umask to mode bits. We will do
2210 * so ourselves when necessary.
2211 */
2212 sb->s_flags |= MS_POSIXACL;
2213 sb->s_time_gran = 1;
816724e6 2214 }
54ceac45
DH		 2215
2216 sb->s_op = &nfs_sops;
2217 nfs_initialise_sb(sb);
f7b422b1
DH		 2218}
2219
2220/*
54ceac45 2221 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2222 */
54ceac45 2223static void nfs_clone_super(struct super_block *sb,
8c958e0c 2224 struct nfs_mount_info *mount_info)
f7b422b1 2225{
8c958e0c 2226 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2227 struct nfs_server *server = NFS_SB(sb);
2228
2229 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2230 sb->s_blocksize = old_sb->s_blocksize;
2231 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2232
8a6e5deb 2233 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2234 /* The VFS shouldn't apply the umask to mode bits. We will do
2235 * so ourselves when necessary.
f7b422b1
DH		 2236 */
2237 sb->s_flags |= MS_POSIXACL;
f7b422b1 2238 sb->s_time_gran = 1;
f7b422b1
DH		 2239 }
2240
54ceac45
DH		 2241 sb->s_op = old_sb->s_op;
2242 nfs_initialise_sb(sb);
f7b422b1
DH		 2243}
2244
275a5d24
TM		 2245static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2246{
2247 const struct nfs_server *a = s->s_fs_info;
2248 const struct rpc_clnt *clnt_a = a->client;
2249 const struct rpc_clnt *clnt_b = b->client;
2250
2251 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2252 goto Ebusy;
2253 if (a->nfs_client != b->nfs_client)
2254 goto Ebusy;
2255 if (a->flags != b->flags)
2256 goto Ebusy;
2257 if (a->wsize != b->wsize)
2258 goto Ebusy;
2259 if (a->rsize != b->rsize)
2260 goto Ebusy;
2261 if (a->acregmin != b->acregmin)
2262 goto Ebusy;
2263 if (a->acregmax != b->acregmax)
2264 goto Ebusy;
2265 if (a->acdirmin != b->acdirmin)
2266 goto Ebusy;
2267 if (a->acdirmax != b->acdirmax)
2268 goto Ebusy;
2269 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2270 goto Ebusy;
e89a5a43 2271 return 1;
275a5d24 2272Ebusy:
e89a5a43
TM		 2273 return 0;
2274}
2275
2276struct nfs_sb_mountdata {
2277 struct nfs_server *server;
2278 int mntflags;
2279};
2280
2281static int nfs_set_super(struct super_block *s, void *data)
2282{
2283 struct nfs_sb_mountdata *sb_mntdata = data;
2284 struct nfs_server *server = sb_mntdata->server;
2285 int ret;
2286
2287 s->s_flags = sb_mntdata->mntflags;
2288 s->s_fs_info = server;
8b244ff2 2289 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2290 ret = set_anon_super(s, server);
2291 if (ret == 0)
2292 server->s_dev = s->s_dev;
2293 return ret;
2294}
2295
fd00a8ff
CL		 2296static int nfs_compare_super_address(struct nfs_server *server1,
2297 struct nfs_server *server2)
2298{
2299 struct sockaddr *sap1, *sap2;
2300
2301 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2302 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2303
2304 if (sap1->sa_family != sap2->sa_family)
2305 return 0;
2306
2307 switch (sap1->sa_family) {
2308 case AF_INET: {
2309 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2310 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2311 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2312 return 0;
2313 if (sin1->sin_port != sin2->sin_port)
2314 return 0;
2315 break;
2316 }
2317 case AF_INET6: {
2318 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2319 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2320 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2321 return 0;
2322 if (sin1->sin6_port != sin2->sin6_port)
2323 return 0;
2324 break;
2325 }
2326 default:
2327 return 0;
2328 }
2329
2330 return 1;
2331}
2332
e89a5a43
TM		 2333static int nfs_compare_super(struct super_block *sb, void *data)
2334{
2335 struct nfs_sb_mountdata *sb_mntdata = data;
2336 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2337 int mntflags = sb_mntdata->mntflags;
2338
fd00a8ff 2339 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2340 return 0;
2341 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2342 if (old->flags & NFS_MOUNT_UNSHARED)
2343 return 0;
2344 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2345 return 0;
2346 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2347}
2348
39ffb921 2349#ifdef CONFIG_NFS_FSCACHE
2311b943
BS		 2350static void nfs_get_cache_cookie(struct super_block *sb,
2351 struct nfs_parsed_mount_data *parsed,
2352 struct nfs_clone_mount *cloned)
2353{
2354 char *uniq = NULL;
2355 int ulen = 0;
2356
2357 if (parsed && parsed->fscache_uniq) {
2358 uniq = parsed->fscache_uniq;
2359 ulen = strlen(parsed->fscache_uniq);
2360 } else if (cloned) {
2361 struct nfs_server *mnt_s = NFS_SB(cloned->sb);
2362 if (mnt_s->fscache_key) {
2363 uniq = mnt_s->fscache_key->key.uniquifier;
2364 ulen = mnt_s->fscache_key->key.uniq_len;
2365 };
2366 }
2367
2368 nfs_fscache_get_super_cookie(sb, uniq, ulen);
2369}
39ffb921
TM		 2370#else
2371static void nfs_get_cache_cookie(struct super_block *sb,
2372 struct nfs_parsed_mount_data *parsed,
2373 struct nfs_clone_mount *cloned)
2374{
2375}
2376#endif
2311b943 2377
fa799759
MS		 2378static int nfs_bdi_register(struct nfs_server *server)
2379{
2380 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2381}
2382
3d176e3f
BS		 2383static int nfs_set_sb_security(struct super_block *s, struct dentry *mntroot,
2384 struct nfs_mount_info *mount_info)
2385{
2386 return security_sb_set_mnt_opts(s, &mount_info->parsed->lsm_opts);
2387}
2388
2389static int nfs_clone_sb_security(struct super_block *s, struct dentry *mntroot,
2390 struct nfs_mount_info *mount_info)
2391{
2392 /* clone any lsm security options from the parent to the new sb */
2393 security_sb_clone_mnt_opts(mount_info->cloned->sb, s);
2394 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops)
2395 return -ESTALE;
2396 return 0;
2397}
2398
c40f8d1d
BS		 2399static struct dentry *nfs_fs_mount_common(struct file_system_type *fs_type,
2400 struct nfs_server *server,
2401 int flags, const char *dev_name,
c40f8d1d 2402 struct nfs_mount_info *mount_info)
f7b422b1 2403{
f7b422b1 2404 struct super_block *s;
01194981 2405 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2406 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2407 struct nfs_sb_mountdata sb_mntdata = {
2408 .mntflags = flags,
c40f8d1d 2409 .server = server,
e89a5a43 2410 };
01194981 2411 int error;
33852a1f 2412
75180df2
TM		 2413 if (server->flags & NFS_MOUNT_UNSHARED)
2414 compare_super = NULL;
2415
fb2088cc
SP		 2416 /* -o noac implies -o sync */
2417 if (server->flags & NFS_MOUNT_NOAC)
2418 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2419
54ceac45 2420 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2421 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2422 if (IS_ERR(s)) {
01194981 2423 mntroot = ERR_CAST(s);
54ceac45 2424 goto out_err_nosb;
816724e6
TM		 2425 }
2426
54ceac45
DH		 2427 if (s->s_fs_info != server) {
2428 nfs_free_server(server);
2429 server = NULL;
fa799759
MS		 2430 } else {
2431 error = nfs_bdi_register(server);
01194981
AV		 2432 if (error) {
2433 mntroot = ERR_PTR(error);
cfbc0683 2434 goto error_splat_bdi;
01194981 2435 }
54ceac45 2436 }
f7b422b1 2437
54ceac45
DH		 2438 if (!s->s_root) {
2439 /* initial superblock/root creation */
c40f8d1d 2440 mount_info->fill_super(s, mount_info);
3d176e3f 2441 nfs_get_cache_cookie(s, mount_info->parsed, mount_info->cloned);
54ceac45 2442 }
f7b422b1 2443
87c7083d 2444 mntroot = nfs_get_root(s, mount_info->mntfh, dev_name);
01194981 2445 if (IS_ERR(mntroot))
54ceac45 2446 goto error_splat_super;
816724e6 2447
3d176e3f 2448 error = mount_info->set_security(s, mntroot, mount_info);
f9c3a380
EP		 2449 if (error)
2450 goto error_splat_root;
2451
54ceac45 2452 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2453
2454out:
01194981 2455 return mntroot;
816724e6 2456
54ceac45
DH		 2457out_err_nosb:
2458 nfs_free_server(server);
0655960f 2459 goto out;
54ceac45 2460
f9c3a380
EP		 2461error_splat_root:
2462 dput(mntroot);
01194981 2463 mntroot = ERR_PTR(error);
54ceac45 2464error_splat_super:
cfbc0683
N		 2465 if (server && !s->s_root)
2466 bdi_unregister(&server->backing_dev_info);
2467error_splat_bdi:
6f5bbff9 2468 deactivate_locked_super(s);
0655960f 2469 goto out;
f7b422b1
DH		 2470}
2471
c40f8d1d
BS		 2472static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2473 int flags, const char *dev_name, void *raw_data)
2474{
c40f8d1d
BS		 2475 struct nfs_mount_info mount_info = {
2476 .fill_super = nfs_fill_super,
3d176e3f 2477 .set_security = nfs_set_sb_security,
c40f8d1d 2478 };
c40f8d1d
BS		 2479 struct dentry *mntroot = ERR_PTR(-ENOMEM);
2480 int error;
2481
46058d46 2482 mount_info.parsed = nfs_alloc_parsed_mount_data();
87c7083d
BS		 2483 mount_info.mntfh = nfs_alloc_fhandle();
2484 if (mount_info.parsed == NULL || mount_info.mntfh == NULL)
c40f8d1d
BS		 2485 goto out;
2486
2487 /* Validate the mount data */
87c7083d 2488 error = nfs_validate_mount_data(fs_type, raw_data, mount_info.parsed, mount_info.mntfh, dev_name);
b72e4f42 2489 if (error == NFS_TEXT_DATA)
46058d46 2490 error = nfs_validate_text_mount_data(raw_data, mount_info.parsed, dev_name);
c40f8d1d
BS		 2491 if (error < 0) {
2492 mntroot = ERR_PTR(error);
2493 goto out;
2494 }
c40f8d1d
BS		 2495
2496#ifdef CONFIG_NFS_V4
46058d46 2497 if (mount_info.parsed->version == 4)
87c7083d 2498 mntroot = nfs4_try_mount(flags, dev_name, &mount_info);
486aa699 2499 else
c40f8d1d 2500#endif /* CONFIG_NFS_V4 */
87c7083d 2501 mntroot = nfs_try_mount(flags, dev_name, &mount_info);
c40f8d1d 2502
c40f8d1d 2503out:
46058d46 2504 nfs_free_parsed_mount_data(mount_info.parsed);
87c7083d 2505 nfs_free_fhandle(mount_info.mntfh);
c40f8d1d
BS		 2506 return mntroot;
2507}
2508
387c149b
TM		 2509/*
2510 * Ensure that we unregister the bdi before kill_anon_super
2511 * releases the device name
2512 */
2513static void nfs_put_super(struct super_block *s)
2514{
2515 struct nfs_server *server = NFS_SB(s);
2516
2517 bdi_unregister(&server->backing_dev_info);
2518}
2519
54ceac45
DH		 2520/*
2521 * Destroy an NFS2/3 superblock
2522 */
f7b422b1
DH		 2523static void nfs_kill_super(struct super_block *s)
2524{
2525 struct nfs_server *server = NFS_SB(s);
2526
2527 kill_anon_super(s);
08734048 2528 nfs_fscache_release_super_cookie(s);
54ceac45 2529 nfs_free_server(server);
f7b422b1
DH		 2530}
2531
54ceac45 2532/*
8c958e0c 2533 * Clone an NFS2/3/4 server record on xdev traversal (FSID-change)
54ceac45 2534 */
31f43471 2535static struct dentry *
8c958e0c
BS		 2536nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
2537 const char *dev_name, struct nfs_mount_info *mount_info)
f7b422b1 2538{
8c958e0c 2539 struct nfs_clone_mount *data = mount_info->cloned;
54ceac45 2540 struct nfs_server *server;
3d176e3f 2541 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45 2542 int error;
f7b422b1 2543
8c958e0c 2544 dprintk("--> nfs_xdev_mount_common()\n");
f7b422b1 2545
87c7083d
BS		 2546 mount_info->mntfh = data->fh;
2547
54ceac45 2548 /* create a new volume representation */
7e6eb683 2549 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
54ceac45
DH		 2550 if (IS_ERR(server)) {
2551 error = PTR_ERR(server);
3d176e3f 2552 goto out_err;
4c1fe2f7 2553 }
f7b422b1 2554
87c7083d 2555 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
8c958e0c 2556 dprintk("<-- nfs_xdev_mount_common() = 0\n");
3d176e3f 2557out:
31f43471 2558 return mntroot;
24c8dbbb 2559
3d176e3f 2560out_err:
8c958e0c 2561 dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
3d176e3f 2562 goto out;
f7b422b1
DH		 2563}
2564
8c958e0c
BS		 2565/*
2566 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2567 */
2568static struct dentry *
2569nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2570 const char *dev_name, void *raw_data)
2571{
2572 struct nfs_mount_info mount_info = {
2573 .fill_super = nfs_clone_super,
3d176e3f 2574 .set_security = nfs_clone_sb_security,
8c958e0c
BS		 2575 .cloned = raw_data,
2576 };
2577 return nfs_xdev_mount_common(&nfs_fs_type, flags, dev_name, &mount_info);
2578}
2579
54ceac45
DH		 2580#ifdef CONFIG_NFS_V4
2581
f7b422b1 2582/*
54ceac45 2583 * Finish setting up a cloned NFS4 superblock
f7b422b1 2584 */
54ceac45 2585static void nfs4_clone_super(struct super_block *sb,
8c958e0c 2586 struct nfs_mount_info *mount_info)
f7b422b1 2587{
8c958e0c 2588 const struct super_block *old_sb = mount_info->cloned->sb;
54ceac45
DH		 2589 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2590 sb->s_blocksize = old_sb->s_blocksize;
2591 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2592 sb->s_time_gran = 1;
54ceac45 2593 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2594 /*
2595 * The VFS shouldn't apply the umask to mode bits. We will do
2596 * so ourselves when necessary.
2597 */
2598 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2599 sb->s_xattr = old_sb->s_xattr;
2600 nfs_initialise_sb(sb);
f7b422b1
DH		 2601}
2602
54ceac45
DH		 2603/*
2604 * Set up an NFS4 superblock
2605 */
c40f8d1d
BS		 2606static void nfs4_fill_super(struct super_block *sb,
2607 struct nfs_mount_info *mount_info)
f7b422b1 2608{
54ceac45
DH		 2609 sb->s_time_gran = 1;
2610 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2611 /*
2612 * The VFS shouldn't apply the umask to mode bits. We will do
2613 * so ourselves when necessary.
2614 */
2615 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2616 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2617 nfs_initialise_sb(sb);
f7b422b1
DH		 2618}
2619
01c3f052
TM		 2620static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2621{
5eebde23
SJ		 2622 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2623 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2624}
2625
f0768ebd
CL		 2626/*
2627 * Validate NFSv4 mount options
2628 */
91ea40b9
TT		 2629static int nfs4_validate_mount_data(void *options,
2630 struct nfs_parsed_mount_data *args,
2631 const char *dev_name)
f0768ebd 2632{
4cfd74fc 2633 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2634 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2635 char *c;
2636
2637 if (data == NULL)
2638 goto out_no_data;
2639
2640 switch (data->version) {
2641 case 1:
4c568017
CL		 2642 if (data->host_addrlen > sizeof(args->nfs_server.address))
2643 goto out_no_address;
2644 if (data->host_addrlen == 0)
f0768ebd 2645 goto out_no_address;
4c568017 2646 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2647 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2648 return -EFAULT;
4cfd74fc 2649 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2650 goto out_no_address;
2651
6738b251
CL		 2652 if (data->auth_flavourlen) {
2653 if (data->auth_flavourlen > 1)
2654 goto out_inval_auth;
20c71f5e 2655 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2656 data->auth_flavours,
20c71f5e 2657 sizeof(args->auth_flavors[0])))
f0768ebd 2658 return -EFAULT;
f0768ebd
CL		 2659 }
2660
2661 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2662 if (IS_ERR(c))
2663 return PTR_ERR(c);
91ea40b9 2664 args->nfs_server.hostname = c;
f0768ebd
CL		 2665
2666 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2667 if (IS_ERR(c))
2668 return PTR_ERR(c);
91ea40b9
TT		 2669 args->nfs_server.export_path = c;
2670 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2671
2672 c = strndup_user(data->client_addr.data, 16);
2673 if (IS_ERR(c))
2674 return PTR_ERR(c);
91ea40b9
TT		 2675 args->client_address = c;
2676
2677 /*
2678 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2679 * can deal with.
2680 */
2681
2682 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2683 args->rsize = data->rsize;
2684 args->wsize = data->wsize;
2685 args->timeo = data->timeo;
2686 args->retrans = data->retrans;
2687 args->acregmin = data->acregmin;
2688 args->acregmax = data->acregmax;
2689 args->acdirmin = data->acdirmin;
2690 args->acdirmax = data->acdirmax;
2691 args->nfs_server.protocol = data->proto;
259875ef 2692 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2693
2694 break;
7630c852 2695 default:
b72e4f42 2696 return NFS_TEXT_DATA;
f0768ebd
CL		 2697 }
2698
2699 return 0;
2700
2701out_no_data:
2702 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2703 return -EINVAL;
2704
2705out_inval_auth:
2706 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2707 data->auth_flavourlen);
2708 return -EINVAL;
2709
2710out_no_address:
2711 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2712 return -EINVAL;
f0768ebd
CL		 2713}
2714
54ceac45 2715/*
c02d7adf 2716 * Get the superblock for the NFS4 root partition
54ceac45 2717 */
31f43471
AV		 2718static struct dentry *
2719nfs4_remote_mount(struct file_system_type *fs_type, int flags,
87c7083d 2720 const char *dev_name, void *info)
f7b422b1 2721{
87c7083d 2722 struct nfs_mount_info *mount_info = info;
54ceac45 2723 struct nfs_server *server;
c40f8d1d 2724 struct dentry *mntroot = ERR_PTR(-ENOMEM);
33852a1f 2725
87c7083d
BS		 2726 mount_info->fill_super = nfs4_fill_super;
2727 mount_info->set_security = nfs_set_sb_security;
f9c3a380 2728
54ceac45 2729 /* Get a volume representation */
87c7083d 2730 server = nfs4_create_server(mount_info->parsed, mount_info->mntfh);
54ceac45 2731 if (IS_ERR(server)) {
c40f8d1d 2732 mntroot = ERR_CAST(server);
29eb981a 2733 goto out;
f7b422b1
DH		 2734 }
2735
87c7083d 2736 mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
29eb981a
CL		 2737
2738out:
c40f8d1d 2739 return mntroot;
f7b422b1
DH		 2740}
2741
c02d7adf
TM		 2742static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2743 int flags, void *data, const char *hostname)
2744{
2745 struct vfsmount *root_mnt;
2746 char *root_devname;
2747 size_t len;
2748
98a2139f 2749 len = strlen(hostname) + 5;
c02d7adf
TM		 2750 root_devname = kmalloc(len, GFP_KERNEL);
2751 if (root_devname == NULL)
2752 return ERR_PTR(-ENOMEM);
98a2139f
JK		 2753 /* Does hostname needs to be enclosed in brackets? */
2754 if (strchr(hostname, ':'))
2755 snprintf(root_devname, len, "[%s]:/", hostname);
2756 else
2757 snprintf(root_devname, len, "%s:/", hostname);
c02d7adf
TM		 2758 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2759 kfree(root_devname);
2760 return root_mnt;
2761}
2762
ce587e07
TM		 2763struct nfs_referral_count {
2764 struct list_head list;
2765 const struct task_struct *task;
2766 unsigned int referral_count;
2767};
2768
2769static LIST_HEAD(nfs_referral_count_list);
2770static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2771
2772static struct nfs_referral_count *nfs_find_referral_count(void)
2773{
2774 struct nfs_referral_count *p;
2775
2776 list_for_each_entry(p, &nfs_referral_count_list, list) {
2777 if (p->task == current)
2778 return p;
2779 }
2780 return NULL;
2781}
2782
2783#define NFS_MAX_NESTED_REFERRALS 2
2784
2785static int nfs_referral_loop_protect(void)
2786{
2787 struct nfs_referral_count *p, *new;
2788 int ret = -ENOMEM;
2789
2790 new = kmalloc(sizeof(*new), GFP_KERNEL);
2791 if (!new)
2792 goto out;
2793 new->task = current;
2794 new->referral_count = 1;
2795
2796 ret = 0;
2797 spin_lock(&nfs_referral_count_list_lock);
2798 p = nfs_find_referral_count();
2799 if (p != NULL) {
2800 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2801 ret = -ELOOP;
2802 else
2803 p->referral_count++;
2804 } else {
2805 list_add(&new->list, &nfs_referral_count_list);
2806 new = NULL;
2807 }
2808 spin_unlock(&nfs_referral_count_list_lock);
2809 kfree(new);
2810out:
2811 return ret;
2812}
2813
2814static void nfs_referral_loop_unprotect(void)
2815{
2816 struct nfs_referral_count *p;
2817
2818 spin_lock(&nfs_referral_count_list_lock);
2819 p = nfs_find_referral_count();
2820 p->referral_count--;
2821 if (p->referral_count == 0)
2822 list_del(&p->list);
2823 else
2824 p = NULL;
2825 spin_unlock(&nfs_referral_count_list_lock);
2826 kfree(p);
2827}
2828
01194981
AV		 2829static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2830 const char *export_path)
c02d7adf 2831{
01194981 2832 struct dentry *dentry;
5352d3b6 2833 int err;
c02d7adf 2834
5352d3b6
AV		 2835 if (IS_ERR(root_mnt))
2836 return ERR_CAST(root_mnt);
2837
2838 err = nfs_referral_loop_protect();
2839 if (err) {
ea441d11 2840 mntput(root_mnt);
5352d3b6 2841 return ERR_PTR(err);
ea441d11 2842 }
c02d7adf 2843
ea441d11
AV		 2844 dentry = mount_subtree(root_mnt, export_path);
2845 nfs_referral_loop_unprotect();
c02d7adf 2846
01194981 2847 return dentry;
c02d7adf
TM		 2848}
2849
01194981 2850static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
87c7083d 2851 struct nfs_mount_info *mount_info)
a6fe23be
CL		 2852{
2853 char *export_path;
2854 struct vfsmount *root_mnt;
01194981 2855 struct dentry *res;
87c7083d 2856 struct nfs_parsed_mount_data *data = mount_info->parsed;
a6fe23be
CL		 2857
2858 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2859
2860 export_path = data->nfs_server.export_path;
2861 data->nfs_server.export_path = "/";
87c7083d 2862 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, mount_info,
a6fe23be
CL		 2863 data->nfs_server.hostname);
2864 data->nfs_server.export_path = export_path;
2865
5352d3b6 2866 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2867
01194981
AV		 2868 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2869 IS_ERR(res) ? PTR_ERR(res) : 0,
2870 IS_ERR(res) ? " [error]" : "");
2871 return res;
a6fe23be
CL		 2872}
2873
f7b422b1
DH		 2874static void nfs4_kill_super(struct super_block *sb)
2875{
2876 struct nfs_server *server = NFS_SB(sb);
2877
0f3e66c6 2878 dprintk("--> %s\n", __func__);
515d8611 2879 nfs_super_return_all_delegations(sb);
f7b422b1 2880 kill_anon_super(sb);
08734048 2881 nfs_fscache_release_super_cookie(sb);
54ceac45 2882 nfs_free_server(server);
0f3e66c6 2883 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2884}
2885
2886/*
54ceac45 2887 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2888 */
31f43471
AV		 2889static struct dentry *
2890nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2891 const char *dev_name, void *raw_data)
f7b422b1 2892{
8c958e0c
BS		 2893 struct nfs_mount_info mount_info = {
2894 .fill_super = nfs4_clone_super,
3d176e3f 2895 .set_security = nfs_clone_sb_security,
8c958e0c 2896 .cloned = raw_data,
e89a5a43 2897 };
8c958e0c 2898 return nfs_xdev_mount_common(&nfs4_fs_type, flags, dev_name, &mount_info);
f7b422b1
DH		 2899}
2900
31f43471
AV		 2901static struct dentry *
2902nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2903 const char *dev_name, void *raw_data)
f7b422b1 2904{
21e4b82e
BS		 2905 struct nfs_mount_info mount_info = {
2906 .fill_super = nfs4_fill_super,
2907 .set_security = nfs_clone_sb_security,
2908 .cloned = raw_data,
2909 };
54ceac45 2910 struct nfs_server *server;
21e4b82e 2911 struct dentry *mntroot = ERR_PTR(-ENOMEM);
54ceac45
DH		 2912
2913 dprintk("--> nfs4_referral_get_sb()\n");
2914
87c7083d
BS		 2915 mount_info.mntfh = nfs_alloc_fhandle();
2916 if (mount_info.cloned == NULL || mount_info.mntfh == NULL)
21e4b82e 2917 goto out;
4f727296 2918
54ceac45 2919 /* create a new volume representation */
87c7083d 2920 server = nfs4_create_referral_server(mount_info.cloned, mount_info.mntfh);
54ceac45 2921 if (IS_ERR(server)) {
21e4b82e
BS		 2922 mntroot = ERR_CAST(server);
2923 goto out;
e9cc6c23 2924 }
54ceac45 2925
87c7083d 2926 mntroot = nfs_fs_mount_common(&nfs4_fs_type, server, flags, dev_name, &mount_info);
21e4b82e 2927out:
87c7083d 2928 nfs_free_fhandle(mount_info.mntfh);
31f43471 2929 return mntroot;
f7b422b1
DH		 2930}
2931
c02d7adf
TM		 2932/*
2933 * Create an NFS4 server record on referral traversal
2934 */
01194981
AV		 2935static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
2936 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2937{
2938 struct nfs_clone_mount *data = raw_data;
2939 char *export_path;
2940 struct vfsmount *root_mnt;
01194981 2941 struct dentry *res;
c02d7adf 2942
01194981 2943 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 2944
2945 export_path = data->mnt_path;
2946 data->mnt_path = "/";
2947
2948 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
2949 flags, data, data->hostname);
2950 data->mnt_path = export_path;
2951
5352d3b6 2952 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 2953 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
2954 IS_ERR(res) ? PTR_ERR(res) : 0,
2955 IS_ERR(res) ? " [error]" : "");
2956 return res;
c02d7adf
TM		 2957}
2958
54ceac45 2959#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)