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SUNRPC: fixup for namespace changes
[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>
f7b422b1
DH		 56
57#include <asm/system.h>
58#include <asm/uaccess.h>
59
60#include "nfs4_fs.h"
61#include "callback.h"
62#include "delegation.h"
63#include "iostat.h"
64#include "internal.h"
08734048 65#include "fscache.h"
ae50c0b5 66#include "pnfs.h"
f7b422b1
DH		 67
68#define NFSDBG_FACILITY NFSDBG_VFS
69
1e657bd5
PZ		 70#ifdef CONFIG_NFS_V3
71#define NFS_DEFAULT_VERSION 3
72#else
73#define NFS_DEFAULT_VERSION 2
74#endif
75
bf0fd768
CL		 76enum {
77 /* Mount options that take no arguments */
78 Opt_soft, Opt_hard,
bf0fd768
CL		 79 Opt_posix, Opt_noposix,
80 Opt_cto, Opt_nocto,
81 Opt_ac, Opt_noac,
82 Opt_lock, Opt_nolock,
764302cc 83 Opt_v2, Opt_v3, Opt_v4,
2cf7ff7a 84 Opt_udp, Opt_tcp, Opt_rdma,
bf0fd768
CL		 85 Opt_acl, Opt_noacl,
86 Opt_rdirplus, Opt_nordirplus,
75180df2 87 Opt_sharecache, Opt_nosharecache,
d740351b 88 Opt_resvport, Opt_noresvport,
b797cac7 89 Opt_fscache, Opt_nofscache,
bf0fd768
CL		 90
91 /* Mount options that take integer arguments */
92 Opt_port,
93 Opt_rsize, Opt_wsize, Opt_bsize,
94 Opt_timeo, Opt_retrans,
95 Opt_acregmin, Opt_acregmax,
96 Opt_acdirmin, Opt_acdirmax,
97 Opt_actimeo,
98 Opt_namelen,
99 Opt_mountport,
e887cbcf 100 Opt_mountvers,
ad879cef 101 Opt_nfsvers,
3fd5be9e 102 Opt_minorversion,
bf0fd768
CL		 103
104 /* Mount options that take string arguments */
33832034 105 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
0ac83779 106 Opt_addr, Opt_mountaddr, Opt_clientaddr,
7973c1f1 107 Opt_lookupcache,
b797cac7 108 Opt_fscache_uniq,
5eebde23 109 Opt_local_lock,
bf0fd768 110
f45663ce
CL		 111 /* Special mount options */
112 Opt_userspace, Opt_deprecated, Opt_sloppy,
bf0fd768
CL		 113
114 Opt_err
115};
116
a447c093 117static const match_table_t nfs_mount_option_tokens = {
bf0fd768
CL		 118 { Opt_userspace, "bg" },
119 { Opt_userspace, "fg" },
ecbb3845
CL		 120 { Opt_userspace, "retry=%s" },
121
f45663ce
CL		 122 { Opt_sloppy, "sloppy" },
123
bf0fd768
CL		 124 { Opt_soft, "soft" },
125 { Opt_hard, "hard" },
d33e4dfe
CL		 126 { Opt_deprecated, "intr" },
127 { Opt_deprecated, "nointr" },
bf0fd768
CL		 128 { Opt_posix, "posix" },
129 { Opt_noposix, "noposix" },
130 { Opt_cto, "cto" },
131 { Opt_nocto, "nocto" },
132 { Opt_ac, "ac" },
133 { Opt_noac, "noac" },
134 { Opt_lock, "lock" },
135 { Opt_nolock, "nolock" },
136 { Opt_v2, "v2" },
137 { Opt_v3, "v3" },
764302cc 138 { Opt_v4, "v4" },
bf0fd768
CL		 139 { Opt_udp, "udp" },
140 { Opt_tcp, "tcp" },
2cf7ff7a 141 { Opt_rdma, "rdma" },
bf0fd768
CL		 142 { Opt_acl, "acl" },
143 { Opt_noacl, "noacl" },
144 { Opt_rdirplus, "rdirplus" },
145 { Opt_nordirplus, "nordirplus" },
75180df2
TM		 146 { Opt_sharecache, "sharecache" },
147 { Opt_nosharecache, "nosharecache" },
d740351b
CL		 148 { Opt_resvport, "resvport" },
149 { Opt_noresvport, "noresvport" },
b797cac7 150 { Opt_fscache, "fsc" },
b797cac7 151 { Opt_nofscache, "nofsc" },
bf0fd768 152
a5a16bae
CL		 153 { Opt_port, "port=%s" },
154 { Opt_rsize, "rsize=%s" },
155 { Opt_wsize, "wsize=%s" },
156 { Opt_bsize, "bsize=%s" },
157 { Opt_timeo, "timeo=%s" },
158 { Opt_retrans, "retrans=%s" },
159 { Opt_acregmin, "acregmin=%s" },
160 { Opt_acregmax, "acregmax=%s" },
161 { Opt_acdirmin, "acdirmin=%s" },
162 { Opt_acdirmax, "acdirmax=%s" },
163 { Opt_actimeo, "actimeo=%s" },
164 { Opt_namelen, "namlen=%s" },
165 { Opt_mountport, "mountport=%s" },
166 { Opt_mountvers, "mountvers=%s" },
167 { Opt_nfsvers, "nfsvers=%s" },
168 { Opt_nfsvers, "vers=%s" },
f3f4f4ed 169 { Opt_minorversion, "minorversion=%s" },
bf0fd768
CL		 170
171 { Opt_sec, "sec=%s" },
172 { Opt_proto, "proto=%s" },
173 { Opt_mountproto, "mountproto=%s" },
174 { Opt_addr, "addr=%s" },
175 { Opt_clientaddr, "clientaddr=%s" },
33832034 176 { Opt_mounthost, "mounthost=%s" },
0ac83779 177 { Opt_mountaddr, "mountaddr=%s" },
bf0fd768 178
7973c1f1 179 { Opt_lookupcache, "lookupcache=%s" },
a6d5ff64 180 { Opt_fscache_uniq, "fsc=%s" },
5eebde23 181 { Opt_local_lock, "local_lock=%s" },
7973c1f1 182
bf0fd768
CL		 183 { Opt_err, NULL }
184};
185
186enum {
ee671b01 187 Opt_xprt_udp, Opt_xprt_udp6, Opt_xprt_tcp, Opt_xprt_tcp6, Opt_xprt_rdma,
bf0fd768
CL		 188
189 Opt_xprt_err
190};
191
a447c093 192static const match_table_t nfs_xprt_protocol_tokens = {
bf0fd768 193 { Opt_xprt_udp, "udp" },
ee671b01 194 { Opt_xprt_udp6, "udp6" },
bf0fd768 195 { Opt_xprt_tcp, "tcp" },
ee671b01 196 { Opt_xprt_tcp6, "tcp6" },
2cf7ff7a 197 { Opt_xprt_rdma, "rdma" },
bf0fd768
CL		 198
199 { Opt_xprt_err, NULL }
200};
201
202enum {
203 Opt_sec_none, Opt_sec_sys,
204 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
205 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
206 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
207
208 Opt_sec_err
209};
210
a447c093 211static const match_table_t nfs_secflavor_tokens = {
bf0fd768
CL		 212 { Opt_sec_none, "none" },
213 { Opt_sec_none, "null" },
214 { Opt_sec_sys, "sys" },
215
216 { Opt_sec_krb5, "krb5" },
217 { Opt_sec_krb5i, "krb5i" },
218 { Opt_sec_krb5p, "krb5p" },
219
220 { Opt_sec_lkey, "lkey" },
221 { Opt_sec_lkeyi, "lkeyi" },
222 { Opt_sec_lkeyp, "lkeyp" },
223
8d042218
OK		 224 { Opt_sec_spkm, "spkm3" },
225 { Opt_sec_spkmi, "spkm3i" },
226 { Opt_sec_spkmp, "spkm3p" },
227
bf0fd768
CL		 228 { Opt_sec_err, NULL }
229};
230
7973c1f1
TM		 231enum {
232 Opt_lookupcache_all, Opt_lookupcache_positive,
233 Opt_lookupcache_none,
234
235 Opt_lookupcache_err
236};
237
238static match_table_t nfs_lookupcache_tokens = {
239 { Opt_lookupcache_all, "all" },
240 { Opt_lookupcache_positive, "pos" },
241 { Opt_lookupcache_positive, "positive" },
242 { Opt_lookupcache_none, "none" },
243
244 { Opt_lookupcache_err, NULL }
245};
246
5eebde23
SJ		 247enum {
248 Opt_local_lock_all, Opt_local_lock_flock, Opt_local_lock_posix,
249 Opt_local_lock_none,
250
251 Opt_local_lock_err
252};
253
254static match_table_t nfs_local_lock_tokens = {
255 { Opt_local_lock_all, "all" },
256 { Opt_local_lock_flock, "flock" },
257 { Opt_local_lock_posix, "posix" },
258 { Opt_local_lock_none, "none" },
259
260 { Opt_local_lock_err, NULL }
261};
262
bf0fd768 263
42faad99 264static void nfs_umount_begin(struct super_block *);
816724e6 265static int nfs_statfs(struct dentry *, struct kstatfs *);
34c80b1d 266static int nfs_show_options(struct seq_file *, struct dentry *);
d861c630 267static int nfs_show_devname(struct seq_file *, struct dentry *);
a6322de6 268static int nfs_show_path(struct seq_file *, struct dentry *);
64132379 269static int nfs_show_stats(struct seq_file *, struct dentry *);
01194981
AV		 270static struct dentry *nfs_fs_mount(struct file_system_type *,
271 int, const char *, void *);
31f43471
AV		 272static struct dentry *nfs_xdev_mount(struct file_system_type *fs_type,
273 int flags, const char *dev_name, void *raw_data);
387c149b 274static void nfs_put_super(struct super_block *);
f7b422b1 275static void nfs_kill_super(struct super_block *);
48b605f8 276static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
f7b422b1
DH		 277
278static struct file_system_type nfs_fs_type = {
279 .owner = THIS_MODULE,
280 .name = "nfs",
01194981 281 .mount = nfs_fs_mount,
f7b422b1 282 .kill_sb = nfs_kill_super,
349457cc 283 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 284};
285
54ceac45 286struct file_system_type nfs_xdev_fs_type = {
f7b422b1
DH		 287 .owner = THIS_MODULE,
288 .name = "nfs",
31f43471 289 .mount = nfs_xdev_mount,
f7b422b1 290 .kill_sb = nfs_kill_super,
349457cc 291 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 292};
293
ee9b6d61 294static const struct super_operations nfs_sops = {
f7b422b1
DH		 295 .alloc_inode = nfs_alloc_inode,
296 .destroy_inode = nfs_destroy_inode,
297 .write_inode = nfs_write_inode,
387c149b 298 .put_super = nfs_put_super,
f7b422b1 299 .statfs = nfs_statfs,
b57922d9 300 .evict_inode = nfs_evict_inode,
f7b422b1
DH		 301 .umount_begin = nfs_umount_begin,
302 .show_options = nfs_show_options,
c7f404b4
AV		 303 .show_devname = nfs_show_devname,
304 .show_path = nfs_show_path,
f7b422b1 305 .show_stats = nfs_show_stats,
48b605f8 306 .remount_fs = nfs_remount,
f7b422b1
DH		 307};
308
309#ifdef CONFIG_NFS_V4
7630c852
CL		 310static int nfs4_validate_text_mount_data(void *options,
311 struct nfs_parsed_mount_data *args, const char *dev_name);
01194981
AV		 312static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
313 struct nfs_parsed_mount_data *data);
314static struct dentry *nfs4_mount(struct file_system_type *fs_type,
315 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 316static struct dentry *nfs4_remote_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *raw_data);
318static struct dentry *nfs4_xdev_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *raw_data);
01194981
AV		 320static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *raw_data);
31f43471
AV		 322static struct dentry *nfs4_remote_referral_mount(struct file_system_type *fs_type,
323 int flags, const char *dev_name, void *raw_data);
f7b422b1
DH		 324static void nfs4_kill_super(struct super_block *sb);
325
326static struct file_system_type nfs4_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "nfs4",
01194981 329 .mount = nfs4_mount,
f7b422b1 330 .kill_sb = nfs4_kill_super,
349457cc 331 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 332};
333
c02d7adf
TM		 334static struct file_system_type nfs4_remote_fs_type = {
335 .owner = THIS_MODULE,
336 .name = "nfs4",
31f43471 337 .mount = nfs4_remote_mount,
c02d7adf
TM		 338 .kill_sb = nfs4_kill_super,
339 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
340};
341
54ceac45 342struct file_system_type nfs4_xdev_fs_type = {
f7b422b1
DH		 343 .owner = THIS_MODULE,
344 .name = "nfs4",
31f43471 345 .mount = nfs4_xdev_mount,
f7b422b1 346 .kill_sb = nfs4_kill_super,
349457cc 347 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 348};
349
c02d7adf
TM		 350static struct file_system_type nfs4_remote_referral_fs_type = {
351 .owner = THIS_MODULE,
352 .name = "nfs4",
31f43471 353 .mount = nfs4_remote_referral_mount,
c02d7adf
TM		 354 .kill_sb = nfs4_kill_super,
355 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
356};
357
54ceac45 358struct file_system_type nfs4_referral_fs_type = {
f7b422b1
DH		 359 .owner = THIS_MODULE,
360 .name = "nfs4",
01194981 361 .mount = nfs4_referral_mount,
f7b422b1 362 .kill_sb = nfs4_kill_super,
349457cc 363 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
f7b422b1
DH		 364};
365
ee9b6d61 366static const struct super_operations nfs4_sops = {
f7b422b1
DH		 367 .alloc_inode = nfs_alloc_inode,
368 .destroy_inode = nfs_destroy_inode,
369 .write_inode = nfs_write_inode,
387c149b 370 .put_super = nfs_put_super,
f7b422b1 371 .statfs = nfs_statfs,
b57922d9 372 .evict_inode = nfs4_evict_inode,
f7b422b1
DH		 373 .umount_begin = nfs_umount_begin,
374 .show_options = nfs_show_options,
c7f404b4
AV		 375 .show_devname = nfs_show_devname,
376 .show_path = nfs_show_path,
f7b422b1 377 .show_stats = nfs_show_stats,
48b605f8 378 .remount_fs = nfs_remount,
f7b422b1
DH		 379};
380#endif
381
8e1f936b
RR		 382static struct shrinker acl_shrinker = {
383 .shrink = nfs_access_cache_shrinker,
384 .seeks = DEFAULT_SEEKS,
385};
979df72e 386
f7b422b1
DH		 387/*
388 * Register the NFS filesystems
389 */
390int __init register_nfs_fs(void)
391{
392 int ret;
393
394 ret = register_filesystem(&nfs_fs_type);
395 if (ret < 0)
396 goto error_0;
397
f7b422b1
DH		 398 ret = nfs_register_sysctl();
399 if (ret < 0)
400 goto error_1;
89a09141 401#ifdef CONFIG_NFS_V4
f7b422b1
DH		 402 ret = register_filesystem(&nfs4_fs_type);
403 if (ret < 0)
404 goto error_2;
405#endif
8e1f936b 406 register_shrinker(&acl_shrinker);
f7b422b1
DH		 407 return 0;
408
409#ifdef CONFIG_NFS_V4
410error_2:
411 nfs_unregister_sysctl();
89a09141 412#endif
f7b422b1
DH		 413error_1:
414 unregister_filesystem(&nfs_fs_type);
f7b422b1
DH		 415error_0:
416 return ret;
417}
418
419/*
420 * Unregister the NFS filesystems
421 */
422void __exit unregister_nfs_fs(void)
423{
8e1f936b 424 unregister_shrinker(&acl_shrinker);
f7b422b1
DH		 425#ifdef CONFIG_NFS_V4
426 unregister_filesystem(&nfs4_fs_type);
f7b422b1 427#endif
49af7ee1 428 nfs_unregister_sysctl();
f7b422b1
DH		 429 unregister_filesystem(&nfs_fs_type);
430}
431
1daef0a8 432void nfs_sb_active(struct super_block *sb)
ef818a28 433{
1daef0a8 434 struct nfs_server *server = NFS_SB(sb);
ef818a28 435
1daef0a8
TM		 436 if (atomic_inc_return(&server->active) == 1)
437 atomic_inc(&sb->s_active);
ef818a28
SD		 438}
439
1daef0a8 440void nfs_sb_deactive(struct super_block *sb)
ef818a28
SD		 441{
442 struct nfs_server *server = NFS_SB(sb);
1daef0a8
TM		 443
444 if (atomic_dec_and_test(&server->active))
445 deactivate_super(sb);
ef818a28
SD		 446}
447
f7b422b1
DH		 448/*
449 * Deliver file system statistics to userspace
450 */
816724e6 451static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
f7b422b1 452{
0c7d90cf 453 struct nfs_server *server = NFS_SB(dentry->d_sb);
f7b422b1
DH		 454 unsigned char blockbits;
455 unsigned long blockres;
0c7d90cf 456 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
ca7e9a0d
TM		 457 struct nfs_fsstat res;
458 int error = -ENOMEM;
459
460 res.fattr = nfs_alloc_fattr();
461 if (res.fattr == NULL)
462 goto out_err;
f7b422b1 463
8fa5c000 464 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
fbf3fdd2
MZ		 465 if (unlikely(error == -ESTALE)) {
466 struct dentry *pd_dentry;
467
468 pd_dentry = dget_parent(dentry);
469 if (pd_dentry != NULL) {
470 nfs_zap_caches(pd_dentry->d_inode);
471 dput(pd_dentry);
472 }
473 }
ca7e9a0d 474 nfs_free_fattr(res.fattr);
f7b422b1
DH		 475 if (error < 0)
476 goto out_err;
ca7e9a0d 477
1a0ba9ae 478 buf->f_type = NFS_SUPER_MAGIC;
f7b422b1
DH		 479
480 /*
481 * Current versions of glibc do not correctly handle the
482 * case where f_frsize != f_bsize. Eventually we want to
483 * report the value of wtmult in this field.
484 */
0c7d90cf 485 buf->f_frsize = dentry->d_sb->s_blocksize;
f7b422b1
DH		 486
487 /*
488 * On most *nix systems, f_blocks, f_bfree, and f_bavail
489 * are reported in units of f_frsize. Linux hasn't had
490 * an f_frsize field in its statfs struct until recently,
491 * thus historically Linux's sys_statfs reports these
492 * fields in units of f_bsize.
493 */
0c7d90cf
DH		 494 buf->f_bsize = dentry->d_sb->s_blocksize;
495 blockbits = dentry->d_sb->s_blocksize_bits;
f7b422b1
DH		 496 blockres = (1 << blockbits) - 1;
497 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
498 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
499 buf->f_bavail = (res.abytes + blockres) >> blockbits;
500
501 buf->f_files = res.tfiles;
502 buf->f_ffree = res.afiles;
503
504 buf->f_namelen = server->namelen;
1a0ba9ae 505
f7b422b1
DH		 506 return 0;
507
508 out_err:
3110ff80 509 dprintk("%s: statfs error = %d\n", __func__, -error);
1a0ba9ae 510 return error;
f7b422b1
DH		 511}
512
7d4e2747
DH		 513/*
514 * Map the security flavour number to a name
515 */
81039f1f
TM		 516static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
517{
7d4e2747 518 static const struct {
81039f1f
TM		 519 rpc_authflavor_t flavour;
520 const char *str;
521 } sec_flavours[] = {
522 { RPC_AUTH_NULL, "null" },
523 { RPC_AUTH_UNIX, "sys" },
524 { RPC_AUTH_GSS_KRB5, "krb5" },
525 { RPC_AUTH_GSS_KRB5I, "krb5i" },
526 { RPC_AUTH_GSS_KRB5P, "krb5p" },
527 { RPC_AUTH_GSS_LKEY, "lkey" },
528 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
529 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
530 { RPC_AUTH_GSS_SPKM, "spkm" },
531 { RPC_AUTH_GSS_SPKMI, "spkmi" },
532 { RPC_AUTH_GSS_SPKMP, "spkmp" },
4d81cd16 533 { UINT_MAX, "unknown" }
81039f1f
TM		 534 };
535 int i;
536
4d81cd16 537 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
81039f1f
TM		 538 if (sec_flavours[i].flavour == flavour)
539 break;
540 }
541 return sec_flavours[i].str;
542}
543
ee671b01
JL		 544static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss,
545 int showdefaults)
546{
547 struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address;
548
549 seq_printf(m, ",mountproto=");
550 switch (sap->sa_family) {
551 case AF_INET:
552 switch (nfss->mountd_protocol) {
553 case IPPROTO_UDP:
554 seq_printf(m, RPCBIND_NETID_UDP);
555 break;
556 case IPPROTO_TCP:
557 seq_printf(m, RPCBIND_NETID_TCP);
558 break;
559 default:
560 if (showdefaults)
561 seq_printf(m, "auto");
562 }
563 break;
564 case AF_INET6:
565 switch (nfss->mountd_protocol) {
566 case IPPROTO_UDP:
567 seq_printf(m, RPCBIND_NETID_UDP6);
568 break;
569 case IPPROTO_TCP:
570 seq_printf(m, RPCBIND_NETID_TCP6);
571 break;
572 default:
573 if (showdefaults)
574 seq_printf(m, "auto");
575 }
576 break;
577 default:
578 if (showdefaults)
579 seq_printf(m, "auto");
580 }
581}
582
82d101d5
CL		 583static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
584 int showdefaults)
585{
586 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
587
d5eff1a3
BS		 588 if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE)
589 return;
590
82d101d5
CL		 591 switch (sap->sa_family) {
592 case AF_INET: {
593 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
be859405 594 seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr);
82d101d5
CL		 595 break;
596 }
597 case AF_INET6: {
598 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
d250e190 599 seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr);
82d101d5
CL		 600 break;
601 }
602 default:
603 if (showdefaults)
604 seq_printf(m, ",mountaddr=unspecified");
605 }
606
607 if (nfss->mountd_version || showdefaults)
608 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
aa699473
SK		 609 if ((nfss->mountd_port &&
610 nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) ||
611 showdefaults)
82d101d5
CL		 612 seq_printf(m, ",mountport=%u", nfss->mountd_port);
613
ee671b01 614 nfs_show_mountd_netid(m, nfss, showdefaults);
82d101d5
CL		 615}
616
0be8189f
TM		 617#ifdef CONFIG_NFS_V4
618static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
619 int showdefaults)
620{
621 struct nfs_client *clp = nfss->nfs_client;
622
623 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
624 seq_printf(m, ",minorversion=%u", clp->cl_minorversion);
625}
626#else
627static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss,
628 int showdefaults)
629{
630}
631#endif
632
f7b422b1
DH		 633/*
634 * Describe the mount options in force on this server representation
635 */
82d101d5
CL		 636static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
637 int showdefaults)
f7b422b1 638{
509de811 639 static const struct proc_nfs_info {
f7b422b1 640 int flag;
509de811
DH		 641 const char *str;
642 const char *nostr;
f7b422b1
DH		 643 } nfs_info[] = {
644 { NFS_MOUNT_SOFT, ",soft", ",hard" },
82d101d5 645 { NFS_MOUNT_POSIX, ",posix", "" },
f7b422b1
DH		 646 { NFS_MOUNT_NOCTO, ",nocto", "" },
647 { NFS_MOUNT_NOAC, ",noac", "" },
648 { NFS_MOUNT_NONLM, ",nolock", "" },
649 { NFS_MOUNT_NOACL, ",noacl", "" },
74dd34e6 650 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
d740351b
CL		 651 { NFS_MOUNT_UNSHARED, ",nosharecache", "" },
652 { NFS_MOUNT_NORESVPORT, ",noresvport", "" },
f7b422b1
DH		 653 { 0, NULL, NULL }
654 };
509de811 655 const struct proc_nfs_info *nfs_infop;
8fa5c000 656 struct nfs_client *clp = nfss->nfs_client;
82d101d5 657 u32 version = clp->rpc_ops->version;
7c563cc9 658 int local_flock, local_fcntl;
f7b422b1 659
82d101d5 660 seq_printf(m, ",vers=%u", version);
2d767432
CL		 661 seq_printf(m, ",rsize=%u", nfss->rsize);
662 seq_printf(m, ",wsize=%u", nfss->wsize);
82d101d5
CL		 663 if (nfss->bsize != 0)
664 seq_printf(m, ",bsize=%u", nfss->bsize);
665 seq_printf(m, ",namlen=%u", nfss->namelen);
0e0cab74 666 if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults)
2d767432 667 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
0e0cab74 668 if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults)
2d767432 669 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
0e0cab74 670 if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults)
2d767432 671 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
0e0cab74 672 if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults)
2d767432 673 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
f7b422b1
DH		 674 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
675 if (nfss->flags & nfs_infop->flag)
676 seq_puts(m, nfs_infop->str);
677 else
678 seq_puts(m, nfs_infop->nostr);
679 }
56928edd 680 seq_printf(m, ",proto=%s",
ee671b01 681 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID));
82d101d5
CL		 682 if (version == 4) {
683 if (nfss->port != NFS_PORT)
684 seq_printf(m, ",port=%u", nfss->port);
685 } else
686 if (nfss->port)
687 seq_printf(m, ",port=%u", nfss->port);
688
33170233
TM		 689 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
690 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
81039f1f 691 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
82d101d5
CL		 692
693 if (version != 4)
694 nfs_show_mountd_options(m, nfss, showdefaults);
0be8189f
TM		 695 else
696 nfs_show_nfsv4_options(m, nfss, showdefaults);
82d101d5 697
b797cac7
DH		 698 if (nfss->options & NFS_OPTION_FSCACHE)
699 seq_printf(m, ",fsc");
9b00c643
PL		 700
701 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) {
702 if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
703 seq_printf(m, ",lookupcache=none");
704 else
705 seq_printf(m, ",lookupcache=pos");
706 }
7c563cc9
SJ		 707
708 local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK;
709 local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL;
710
711 if (!local_flock && !local_fcntl)
712 seq_printf(m, ",local_lock=none");
713 else if (local_flock && local_fcntl)
714 seq_printf(m, ",local_lock=all");
715 else if (local_flock)
716 seq_printf(m, ",local_lock=flock");
717 else
718 seq_printf(m, ",local_lock=posix");
f7b422b1
DH		 719}
720
721/*
722 * Describe the mount options on this VFS mountpoint
723 */
34c80b1d 724static int nfs_show_options(struct seq_file *m, struct dentry *root)
f7b422b1 725{
34c80b1d 726 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 727
728 nfs_show_mount_options(m, nfss, 0);
729
5d8515ca
CL		 730 seq_printf(m, ",addr=%s",
731 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
732 RPC_DISPLAY_ADDR));
f7b422b1
DH		 733
734 return 0;
735}
45402c38
HS		 736
737#ifdef CONFIG_NFS_V4
ae50c0b5 738#ifdef CONFIG_NFS_V4_1
45402c38 739static void show_sessions(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 740{
741 if (nfs4_has_session(server->nfs_client))
742 seq_printf(m, ",sessions");
743}
744#else
45402c38
HS		 745static void show_sessions(struct seq_file *m, struct nfs_server *server) {}
746#endif
ae50c0b5
BF		 747#endif
748
45402c38 749#ifdef CONFIG_NFS_V4
ae50c0b5 750#ifdef CONFIG_NFS_V4_1
45402c38 751static void show_pnfs(struct seq_file *m, struct nfs_server *server)
ae50c0b5
BF		 752{
753 seq_printf(m, ",pnfs=");
754 if (server->pnfs_curr_ld)
755 seq_printf(m, "%s", server->pnfs_curr_ld->name);
756 else
757 seq_printf(m, "not configured");
758}
45402c38
HS		 759#else
760static void show_pnfs(struct seq_file *m, struct nfs_server *server) {}
761#endif
762#endif
f7b422b1 763
d861c630 764static int nfs_show_devname(struct seq_file *m, struct dentry *root)
c7f404b4
AV		 765{
766 char *page = (char *) __get_free_page(GFP_KERNEL);
767 char *devname, *dummy;
768 int err = 0;
769 if (!page)
770 return -ENOMEM;
d861c630 771 devname = nfs_path(&dummy, root, page, PAGE_SIZE);
c7f404b4
AV		 772 if (IS_ERR(devname))
773 err = PTR_ERR(devname);
774 else
775 seq_escape(m, devname, " \t\n\\");
776 free_page((unsigned long)page);
777 return err;
778}
779
a6322de6 780static int nfs_show_path(struct seq_file *m, struct dentry *dentry)
c7f404b4
AV		 781{
782 seq_puts(m, "/");
783 return 0;
784}
785
f7b422b1
DH		 786/*
787 * Present statistical information for this VFS mountpoint
788 */
64132379 789static int nfs_show_stats(struct seq_file *m, struct dentry *root)
f7b422b1
DH		 790{
791 int i, cpu;
64132379 792 struct nfs_server *nfss = NFS_SB(root->d_sb);
f7b422b1
DH		 793 struct rpc_auth *auth = nfss->client->cl_auth;
794 struct nfs_iostats totals = { };
795
796 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
797
798 /*
799 * Display all mount option settings
800 */
801 seq_printf(m, "\n\topts:\t");
64132379
AV		 802 seq_puts(m, root->d_sb->s_flags & MS_RDONLY ? "ro" : "rw");
803 seq_puts(m, root->d_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
804 seq_puts(m, root->d_sb->s_flags & MS_NOATIME ? ",noatime" : "");
805 seq_puts(m, root->d_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
f7b422b1
DH		 806 nfs_show_mount_options(m, nfss, 1);
807
808 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
809
810 seq_printf(m, "\n\tcaps:\t");
811 seq_printf(m, "caps=0x%x", nfss->caps);
2d767432
CL		 812 seq_printf(m, ",wtmult=%u", nfss->wtmult);
813 seq_printf(m, ",dtsize=%u", nfss->dtsize);
814 seq_printf(m, ",bsize=%u", nfss->bsize);
815 seq_printf(m, ",namlen=%u", nfss->namelen);
f7b422b1
DH		 816
817#ifdef CONFIG_NFS_V4
40c55319 818 if (nfss->nfs_client->rpc_ops->version == 4) {
f7b422b1
DH		 819 seq_printf(m, "\n\tnfsv4:\t");
820 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
821 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
822 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
ae50c0b5
BF		 823 show_sessions(m, nfss);
824 show_pnfs(m, nfss);
f7b422b1
DH		 825 }
826#endif
827
828 /*
829 * Display security flavor in effect for this mount
830 */
2d767432 831 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
f7b422b1 832 if (auth->au_flavor)
2d767432 833 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
f7b422b1
DH		 834
835 /*
836 * Display superblock I/O counters
837 */
838 for_each_possible_cpu(cpu) {
839 struct nfs_iostats *stats;
840
841 preempt_disable();
842 stats = per_cpu_ptr(nfss->io_stats, cpu);
843
844 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
845 totals.events[i] += stats->events[i];
846 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
847 totals.bytes[i] += stats->bytes[i];
6a51091d
DH		 848#ifdef CONFIG_NFS_FSCACHE
849 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
850 totals.fscache[i] += stats->fscache[i];
851#endif
f7b422b1
DH		 852
853 preempt_enable();
854 }
855
856 seq_printf(m, "\n\tevents:\t");
857 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
858 seq_printf(m, "%lu ", totals.events[i]);
859 seq_printf(m, "\n\tbytes:\t");
860 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
861 seq_printf(m, "%Lu ", totals.bytes[i]);
6a51091d
DH		 862#ifdef CONFIG_NFS_FSCACHE
863 if (nfss->options & NFS_OPTION_FSCACHE) {
864 seq_printf(m, "\n\tfsc:\t");
865 for (i = 0; i < __NFSIOS_FSCACHEMAX; i++)
866 seq_printf(m, "%Lu ", totals.bytes[i]);
867 }
868#endif
f7b422b1
DH		 869 seq_printf(m, "\n");
870
871 rpc_print_iostats(m, nfss->client);
872
873 return 0;
874}
875
876/*
877 * Begin unmount by attempting to remove all automounted mountpoints we added
54ceac45 878 * in response to xdev traversals and referrals
f7b422b1 879 */
42faad99 880static void nfs_umount_begin(struct super_block *sb)
f7b422b1 881{
67e55205 882 struct nfs_server *server;
fc6ae3cf
TM		 883 struct rpc_clnt *rpc;
884
67e55205 885 server = NFS_SB(sb);
fc6ae3cf
TM		 886 /* -EIO all pending I/O */
887 rpc = server->client_acl;
888 if (!IS_ERR(rpc))
889 rpc_killall_tasks(rpc);
890 rpc = server->client;
891 if (!IS_ERR(rpc))
892 rpc_killall_tasks(rpc);
f7b422b1
DH		 893}
894
c5811dbd 895static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(unsigned int version)
9423a08a
CL		 896{
897 struct nfs_parsed_mount_data *data;
898
899 data = kzalloc(sizeof(*data), GFP_KERNEL);
900 if (data) {
9423a08a
CL		 901 data->acregmin = NFS_DEF_ACREGMIN;
902 data->acregmax = NFS_DEF_ACREGMAX;
903 data->acdirmin = NFS_DEF_ACDIRMIN;
904 data->acdirmax = NFS_DEF_ACDIRMAX;
c5811dbd 905 data->mount_server.port = NFS_UNSPEC_PORT;
9423a08a 906 data->nfs_server.port = NFS_UNSPEC_PORT;
c5811dbd 907 data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
9423a08a
CL		 908 data->auth_flavors[0] = RPC_AUTH_UNIX;
909 data->auth_flavor_len = 1;
c5811dbd 910 data->version = version;
9423a08a 911 data->minorversion = 0;
8a0d551a 912 security_init_mnt_opts(&data->lsm_opts);
9423a08a
CL		 913 }
914 return data;
915}
916
8a0d551a
JL		 917static void nfs_free_parsed_mount_data(struct nfs_parsed_mount_data *data)
918{
919 if (data) {
920 kfree(data->client_address);
921 kfree(data->mount_server.hostname);
922 kfree(data->nfs_server.export_path);
923 kfree(data->nfs_server.hostname);
924 kfree(data->fscache_uniq);
925 security_free_mnt_opts(&data->lsm_opts);
926 kfree(data);
927 }
928}
929
fc50d58f 930/*
cdcd7f9a
CL		 931 * Sanity-check a server address provided by the mount command.
932 *
933 * Address family must be initialized, and address must not be
934 * the ANY address for that family.
fc50d58f
CL		 935 */
936static int nfs_verify_server_address(struct sockaddr *addr)
937{
938 switch (addr->sa_family) {
939 case AF_INET: {
cdcd7f9a 940 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
e6f1cebf 941 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
cdcd7f9a
CL		 942 }
943 case AF_INET6: {
944 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
945 return !ipv6_addr_any(sa);
fc50d58f
CL		 946 }
947 }
948
53a0b9c4 949 dfprintk(MOUNT, "NFS: Invalid IP address specified\n");
fc50d58f
CL		 950 return 0;
951}
952
4cfd74fc
CL		 953/*
954 * Select between a default port value and a user-specified port value.
955 * If a zero value is set, then autobind will be used.
956 */
f5855fec 957static void nfs_set_port(struct sockaddr *sap, int *port,
4cfd74fc
CL		 958 const unsigned short default_port)
959{
f5855fec
TM		 960 if (*port == NFS_UNSPEC_PORT)
961 *port = default_port;
4cfd74fc 962
f5855fec 963 rpc_set_port(sap, *port);
4cfd74fc
CL		 964}
965
259875ef
TM		 966/*
967 * Sanity check the NFS transport protocol.
968 *
969 */
970static void nfs_validate_transport_protocol(struct nfs_parsed_mount_data *mnt)
971{
972 switch (mnt->nfs_server.protocol) {
973 case XPRT_TRANSPORT_UDP:
974 case XPRT_TRANSPORT_TCP:
975 case XPRT_TRANSPORT_RDMA:
976 break;
977 default:
978 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
979 }
980}
981
982/*
983 * For text based NFSv2/v3 mounts, the mount protocol transport default
984 * settings should depend upon the specified NFS transport.
985 */
986static void nfs_set_mount_transport_protocol(struct nfs_parsed_mount_data *mnt)
987{
988 nfs_validate_transport_protocol(mnt);
989
990 if (mnt->mount_server.protocol == XPRT_TRANSPORT_UDP ||
991 mnt->mount_server.protocol == XPRT_TRANSPORT_TCP)
992 return;
993 switch (mnt->nfs_server.protocol) {
994 case XPRT_TRANSPORT_UDP:
995 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
996 break;
997 case XPRT_TRANSPORT_TCP:
998 case XPRT_TRANSPORT_RDMA:
999 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1000 }
1001}
1002
01060c89
CL		 1003/*
1004 * Parse the value of the 'sec=' option.
01060c89
CL		 1005 */
1006static int nfs_parse_security_flavors(char *value,
1007 struct nfs_parsed_mount_data *mnt)
1008{
1009 substring_t args[MAX_OPT_ARGS];
1010
1011 dfprintk(MOUNT, "NFS: parsing sec=%s option\n", value);
1012
1013 switch (match_token(value, nfs_secflavor_tokens, args)) {
1014 case Opt_sec_none:
01060c89
CL		 1015 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1016 break;
1017 case Opt_sec_sys:
01060c89
CL		 1018 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1019 break;
1020 case Opt_sec_krb5:
01060c89
CL		 1021 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1022 break;
1023 case Opt_sec_krb5i:
01060c89
CL		 1024 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1025 break;
1026 case Opt_sec_krb5p:
01060c89
CL		 1027 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1028 break;
1029 case Opt_sec_lkey:
01060c89
CL		 1030 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1031 break;
1032 case Opt_sec_lkeyi:
01060c89
CL		 1033 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1034 break;
1035 case Opt_sec_lkeyp:
01060c89
CL		 1036 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1037 break;
1038 case Opt_sec_spkm:
01060c89
CL		 1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1040 break;
1041 case Opt_sec_spkmi:
01060c89
CL		 1042 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1043 break;
1044 case Opt_sec_spkmp:
01060c89
CL		 1045 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1046 break;
1047 default:
1048 return 0;
1049 }
1050
9b7160c5 1051 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
059f90b3 1052 mnt->auth_flavor_len = 1;
01060c89
CL		 1053 return 1;
1054}
1055
c5cb09b6
RL		 1056static int nfs_get_option_str(substring_t args[], char **option)
1057{
1058 kfree(*option);
1059 *option = match_strdup(args);
1060 return !option;
1061}
1062
1063static int nfs_get_option_ul(substring_t args[], unsigned long *option)
1064{
1065 int rc;
1066 char *string;
1067
1068 string = match_strdup(args);
1069 if (string == NULL)
1070 return -ENOMEM;
1071 rc = strict_strtoul(string, 10, option);
1072 kfree(string);
1073
1074 return rc;
1075}
1076
bf0fd768
CL		 1077/*
1078 * Error-check and convert a string of mount options from user space into
f45663ce
CL		 1079 * a data structure. The whole mount string is processed; bad options are
1080 * skipped as they are encountered. If there were no errors, return 1;
1081 * otherwise return 0 (zero).
bf0fd768
CL		 1082 */
1083static int nfs_parse_mount_options(char *raw,
1084 struct nfs_parsed_mount_data *mnt)
1085{
f9c3a380 1086 char *p, *string, *secdata;
d23c45fd 1087 int rc, sloppy = 0, invalid_option = 0;
ee671b01
JL		 1088 unsigned short protofamily = AF_UNSPEC;
1089 unsigned short mountfamily = AF_UNSPEC;
bf0fd768
CL		 1090
1091 if (!raw) {
1092 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
1093 return 1;
1094 }
1095 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
1096
f9c3a380
EP		 1097 secdata = alloc_secdata();
1098 if (!secdata)
1099 goto out_nomem;
1100
1101 rc = security_sb_copy_data(raw, secdata);
1102 if (rc)
1103 goto out_security_failure;
1104
1105 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
1106 if (rc)
1107 goto out_security_failure;
1108
1109 free_secdata(secdata);
1110
e50a7a1a
SK		 1111 mnt->net = current->nsproxy->net_ns;
1112
bf0fd768
CL		 1113 while ((p = strsep(&raw, ",")) != NULL) {
1114 substring_t args[MAX_OPT_ARGS];
a5a16bae
CL		 1115 unsigned long option;
1116 int token;
bf0fd768
CL		 1117
1118 if (!*p)
1119 continue;
1120
1121 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
1122
1123 token = match_token(p, nfs_mount_option_tokens, args);
1124 switch (token) {
f45663ce
CL		 1125
1126 /*
1127 * boolean options: foo/nofoo
1128 */
bf0fd768
CL		 1129 case Opt_soft:
1130 mnt->flags |= NFS_MOUNT_SOFT;
1131 break;
1132 case Opt_hard:
1133 mnt->flags &= ~NFS_MOUNT_SOFT;
1134 break;
bf0fd768
CL		 1135 case Opt_posix:
1136 mnt->flags |= NFS_MOUNT_POSIX;
1137 break;
1138 case Opt_noposix:
1139 mnt->flags &= ~NFS_MOUNT_POSIX;
1140 break;
1141 case Opt_cto:
1142 mnt->flags &= ~NFS_MOUNT_NOCTO;
1143 break;
1144 case Opt_nocto:
1145 mnt->flags |= NFS_MOUNT_NOCTO;
1146 break;
1147 case Opt_ac:
1148 mnt->flags &= ~NFS_MOUNT_NOAC;
1149 break;
1150 case Opt_noac:
1151 mnt->flags |= NFS_MOUNT_NOAC;
1152 break;
1153 case Opt_lock:
1154 mnt->flags &= ~NFS_MOUNT_NONLM;
5eebde23
SJ		 1155 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1156 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1157 break;
1158 case Opt_nolock:
1159 mnt->flags |= NFS_MOUNT_NONLM;
5eebde23
SJ		 1160 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1161 NFS_MOUNT_LOCAL_FCNTL);
bf0fd768
CL		 1162 break;
1163 case Opt_v2:
1164 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1165 mnt->version = 2;
bf0fd768
CL		 1166 break;
1167 case Opt_v3:
1168 mnt->flags |= NFS_MOUNT_VER3;
764302cc 1169 mnt->version = 3;
bf0fd768 1170 break;
764302cc
CL		 1171 case Opt_v4:
1172 mnt->flags &= ~NFS_MOUNT_VER3;
1173 mnt->version = 4;
1174 break;
bf0fd768
CL		 1175 case Opt_udp:
1176 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1177 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768
CL		 1178 break;
1179 case Opt_tcp:
1180 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1181 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1182 break;
2cf7ff7a
TT		 1183 case Opt_rdma:
1184 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
1185 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1186 xprt_load_transport(p);
2cf7ff7a 1187 break;
bf0fd768
CL		 1188 case Opt_acl:
1189 mnt->flags &= ~NFS_MOUNT_NOACL;
1190 break;
1191 case Opt_noacl:
1192 mnt->flags |= NFS_MOUNT_NOACL;
1193 break;
1194 case Opt_rdirplus:
1195 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
1196 break;
1197 case Opt_nordirplus:
1198 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
1199 break;
75180df2
TM		 1200 case Opt_sharecache:
1201 mnt->flags &= ~NFS_MOUNT_UNSHARED;
1202 break;
1203 case Opt_nosharecache:
1204 mnt->flags |= NFS_MOUNT_UNSHARED;
1205 break;
d740351b
CL		 1206 case Opt_resvport:
1207 mnt->flags &= ~NFS_MOUNT_NORESVPORT;
1208 break;
1209 case Opt_noresvport:
1210 mnt->flags |= NFS_MOUNT_NORESVPORT;
1211 break;
b797cac7
DH		 1212 case Opt_fscache:
1213 mnt->options |= NFS_OPTION_FSCACHE;
1214 kfree(mnt->fscache_uniq);
1215 mnt->fscache_uniq = NULL;
1216 break;
1217 case Opt_nofscache:
1218 mnt->options &= ~NFS_OPTION_FSCACHE;
1219 kfree(mnt->fscache_uniq);
1220 mnt->fscache_uniq = NULL;
1221 break;
bf0fd768 1222
f45663ce
CL		 1223 /*
1224 * options that take numeric values
1225 */
bf0fd768 1226 case Opt_port:
c5cb09b6
RL		 1227 if (nfs_get_option_ul(args, &option) ||
1228 option > USHRT_MAX)
d23c45fd
CL		 1229 goto out_invalid_value;
1230 mnt->nfs_server.port = option;
bf0fd768
CL		 1231 break;
1232 case Opt_rsize:
c5cb09b6 1233 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1234 goto out_invalid_value;
1235 mnt->rsize = option;
bf0fd768
CL		 1236 break;
1237 case Opt_wsize:
c5cb09b6 1238 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1239 goto out_invalid_value;
1240 mnt->wsize = option;
bf0fd768
CL		 1241 break;
1242 case Opt_bsize:
c5cb09b6 1243 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1244 goto out_invalid_value;
1245 mnt->bsize = option;
bf0fd768
CL		 1246 break;
1247 case Opt_timeo:
c5cb09b6 1248 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1249 goto out_invalid_value;
1250 mnt->timeo = option;
bf0fd768
CL		 1251 break;
1252 case Opt_retrans:
c5cb09b6 1253 if (nfs_get_option_ul(args, &option) || option == 0)
d23c45fd
CL		 1254 goto out_invalid_value;
1255 mnt->retrans = option;
bf0fd768
CL		 1256 break;
1257 case Opt_acregmin:
c5cb09b6 1258 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1259 goto out_invalid_value;
1260 mnt->acregmin = option;
bf0fd768
CL		 1261 break;
1262 case Opt_acregmax:
c5cb09b6 1263 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1264 goto out_invalid_value;
1265 mnt->acregmax = option;
bf0fd768
CL		 1266 break;
1267 case Opt_acdirmin:
c5cb09b6 1268 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1269 goto out_invalid_value;
1270 mnt->acdirmin = option;
bf0fd768
CL		 1271 break;
1272 case Opt_acdirmax:
c5cb09b6 1273 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1274 goto out_invalid_value;
1275 mnt->acdirmax = option;
bf0fd768
CL		 1276 break;
1277 case Opt_actimeo:
c5cb09b6 1278 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1279 goto out_invalid_value;
1280 mnt->acregmin = mnt->acregmax =
1281 mnt->acdirmin = mnt->acdirmax = option;
bf0fd768
CL		 1282 break;
1283 case Opt_namelen:
c5cb09b6 1284 if (nfs_get_option_ul(args, &option))
d23c45fd
CL		 1285 goto out_invalid_value;
1286 mnt->namlen = option;
bf0fd768
CL		 1287 break;
1288 case Opt_mountport:
c5cb09b6
RL		 1289 if (nfs_get_option_ul(args, &option) ||
1290 option > USHRT_MAX)
d23c45fd
CL		 1291 goto out_invalid_value;
1292 mnt->mount_server.port = option;
bf0fd768 1293 break;
bf0fd768 1294 case Opt_mountvers:
c5cb09b6 1295 if (nfs_get_option_ul(args, &option) ||
f45663ce 1296 option < NFS_MNT_VERSION ||
d23c45fd
CL		 1297 option > NFS_MNT3_VERSION)
1298 goto out_invalid_value;
1299 mnt->mount_server.version = option;
bf0fd768 1300 break;
bf0fd768 1301 case Opt_nfsvers:
c5cb09b6 1302 if (nfs_get_option_ul(args, &option))
d23c45fd 1303 goto out_invalid_value;
bf0fd768 1304 switch (option) {
f45663ce 1305 case NFS2_VERSION:
bf0fd768 1306 mnt->flags &= ~NFS_MOUNT_VER3;
764302cc 1307 mnt->version = 2;
bf0fd768 1308 break;
f45663ce 1309 case NFS3_VERSION:
bf0fd768 1310 mnt->flags |= NFS_MOUNT_VER3;
764302cc
CL		 1311 mnt->version = 3;
1312 break;
764302cc
CL		 1313 case NFS4_VERSION:
1314 mnt->flags &= ~NFS_MOUNT_VER3;
1315 mnt->version = 4;
bf0fd768
CL		 1316 break;
1317 default:
d23c45fd 1318 goto out_invalid_value;
bf0fd768
CL		 1319 }
1320 break;
3fd5be9e 1321 case Opt_minorversion:
c5cb09b6 1322 if (nfs_get_option_ul(args, &option))
f3f4f4ed
CL		 1323 goto out_invalid_value;
1324 if (option > NFS4_MAX_MINOR_VERSION)
1325 goto out_invalid_value;
1326 mnt->minorversion = option;
3fd5be9e 1327 break;
bf0fd768 1328
f45663ce
CL		 1329 /*
1330 * options that take text values
1331 */
bf0fd768
CL		 1332 case Opt_sec:
1333 string = match_strdup(args);
1334 if (string == NULL)
1335 goto out_nomem;
01060c89 1336 rc = nfs_parse_security_flavors(string, mnt);
bf0fd768 1337 kfree(string);
f45663ce 1338 if (!rc) {
f45663ce
CL		 1339 dfprintk(MOUNT, "NFS: unrecognized "
1340 "security flavor\n");
d23c45fd 1341 return 0;
f45663ce 1342 }
bf0fd768
CL		 1343 break;
1344 case Opt_proto:
1345 string = match_strdup(args);
1346 if (string == NULL)
1347 goto out_nomem;
1348 token = match_token(string,
1349 nfs_xprt_protocol_tokens, args);
bf0fd768 1350
ee671b01 1351 protofamily = AF_INET;
bf0fd768 1352 switch (token) {
ee671b01
JL		 1353 case Opt_xprt_udp6:
1354 protofamily = AF_INET6;
fdb66ff4 1355 case Opt_xprt_udp:
bf0fd768 1356 mnt->flags &= ~NFS_MOUNT_TCP;
0896a725 1357 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1358 break;
ee671b01
JL		 1359 case Opt_xprt_tcp6:
1360 protofamily = AF_INET6;
fdb66ff4 1361 case Opt_xprt_tcp:
bf0fd768 1362 mnt->flags |= NFS_MOUNT_TCP;
0896a725 1363 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1364 break;
2cf7ff7a
TT		 1365 case Opt_xprt_rdma:
1366 /* vector side protocols to TCP */
1367 mnt->flags |= NFS_MOUNT_TCP;
1368 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
a67d18f8 1369 xprt_load_transport(string);
2cf7ff7a 1370 break;
bf0fd768 1371 default:
f45663ce
CL		 1372 dfprintk(MOUNT, "NFS: unrecognized "
1373 "transport protocol\n");
4223a4a1 1374 kfree(string);
d23c45fd 1375 return 0;
bf0fd768 1376 }
c5cb09b6 1377 kfree(string);
bf0fd768
CL		 1378 break;
1379 case Opt_mountproto:
1380 string = match_strdup(args);
1381 if (string == NULL)
1382 goto out_nomem;
1383 token = match_token(string,
1384 nfs_xprt_protocol_tokens, args);
d508afb4 1385 kfree(string);
bf0fd768 1386
ee671b01 1387 mountfamily = AF_INET;
bf0fd768 1388 switch (token) {
ee671b01
JL		 1389 case Opt_xprt_udp6:
1390 mountfamily = AF_INET6;
fdb66ff4 1391 case Opt_xprt_udp:
0896a725 1392 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
bf0fd768 1393 break;
ee671b01
JL		 1394 case Opt_xprt_tcp6:
1395 mountfamily = AF_INET6;
fdb66ff4 1396 case Opt_xprt_tcp:
0896a725 1397 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
bf0fd768 1398 break;
2cf7ff7a 1399 case Opt_xprt_rdma: /* not used for side protocols */
bf0fd768 1400 default:
f45663ce
CL		 1401 dfprintk(MOUNT, "NFS: unrecognized "
1402 "transport protocol\n");
d23c45fd 1403 return 0;
bf0fd768
CL		 1404 }
1405 break;
1406 case Opt_addr:
1407 string = match_strdup(args);
1408 if (string == NULL)
1409 goto out_nomem;
53a0b9c4 1410 mnt->nfs_server.addrlen =
90100b17 1411 rpc_pton(&init_net, string, strlen(string),
53a0b9c4
CL		 1412 (struct sockaddr *)
1413 &mnt->nfs_server.address,
1414 sizeof(mnt->nfs_server.address));
bf0fd768 1415 kfree(string);
53a0b9c4
CL		 1416 if (mnt->nfs_server.addrlen == 0)
1417 goto out_invalid_address;
bf0fd768
CL		 1418 break;
1419 case Opt_clientaddr:
c5cb09b6 1420 if (nfs_get_option_str(args, &mnt->client_address))
bf0fd768 1421 goto out_nomem;
bf0fd768 1422 break;
33832034 1423 case Opt_mounthost:
c5cb09b6
RL		 1424 if (nfs_get_option_str(args,
1425 &mnt->mount_server.hostname))
33832034 1426 goto out_nomem;
33832034 1427 break;
0ac83779 1428 case Opt_mountaddr:
bf0fd768
CL		 1429 string = match_strdup(args);
1430 if (string == NULL)
1431 goto out_nomem;
53a0b9c4 1432 mnt->mount_server.addrlen =
90100b17 1433 rpc_pton(&init_net, string, strlen(string),
53a0b9c4
CL		 1434 (struct sockaddr *)
1435 &mnt->mount_server.address,
1436 sizeof(mnt->mount_server.address));
bf0fd768 1437 kfree(string);
53a0b9c4
CL		 1438 if (mnt->mount_server.addrlen == 0)
1439 goto out_invalid_address;
bf0fd768 1440 break;
7973c1f1
TM		 1441 case Opt_lookupcache:
1442 string = match_strdup(args);
1443 if (string == NULL)
1444 goto out_nomem;
1445 token = match_token(string,
1446 nfs_lookupcache_tokens, args);
1447 kfree(string);
1448 switch (token) {
1449 case Opt_lookupcache_all:
1450 mnt->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE);
1451 break;
1452 case Opt_lookupcache_positive:
1453 mnt->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE;
1454 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG;
1455 break;
1456 case Opt_lookupcache_none:
1457 mnt->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE;
1458 break;
1459 default:
7973c1f1
TM		 1460 dfprintk(MOUNT, "NFS: invalid "
1461 "lookupcache argument\n");
d23c45fd 1462 return 0;
7973c1f1
TM		 1463 };
1464 break;
a6d5ff64 1465 case Opt_fscache_uniq:
c5cb09b6 1466 if (nfs_get_option_str(args, &mnt->fscache_uniq))
a6d5ff64 1467 goto out_nomem;
a6d5ff64
CL		 1468 mnt->options |= NFS_OPTION_FSCACHE;
1469 break;
5eebde23
SJ		 1470 case Opt_local_lock:
1471 string = match_strdup(args);
1472 if (string == NULL)
1473 goto out_nomem;
1474 token = match_token(string, nfs_local_lock_tokens,
1475 args);
1476 kfree(string);
1477 switch (token) {
1478 case Opt_local_lock_all:
1479 mnt->flags |= (NFS_MOUNT_LOCAL_FLOCK |
1480 NFS_MOUNT_LOCAL_FCNTL);
1481 break;
1482 case Opt_local_lock_flock:
1483 mnt->flags |= NFS_MOUNT_LOCAL_FLOCK;
1484 break;
1485 case Opt_local_lock_posix:
1486 mnt->flags |= NFS_MOUNT_LOCAL_FCNTL;
1487 break;
1488 case Opt_local_lock_none:
1489 mnt->flags &= ~(NFS_MOUNT_LOCAL_FLOCK |
1490 NFS_MOUNT_LOCAL_FCNTL);
1491 break;
1492 default:
1493 dfprintk(MOUNT, "NFS: invalid "
1494 "local_lock argument\n");
1495 return 0;
1496 };
1497 break;
bf0fd768 1498
f45663ce
CL		 1499 /*
1500 * Special options
1501 */
1502 case Opt_sloppy:
1503 sloppy = 1;
1504 dfprintk(MOUNT, "NFS: relaxing parsing rules\n");
1505 break;
bf0fd768
CL		 1506 case Opt_userspace:
1507 case Opt_deprecated:
d33e4dfe
CL		 1508 dfprintk(MOUNT, "NFS: ignoring mount option "
1509 "'%s'\n", p);
bf0fd768
CL		 1510 break;
1511
1512 default:
d23c45fd 1513 invalid_option = 1;
f45663ce
CL		 1514 dfprintk(MOUNT, "NFS: unrecognized mount option "
1515 "'%s'\n", p);
bf0fd768
CL		 1516 }
1517 }
1518
d23c45fd
CL		 1519 if (!sloppy && invalid_option)
1520 return 0;
1521
ee671b01
JL		 1522 /*
1523 * verify that any proto=/mountproto= options match the address
1524 * familiies in the addr=/mountaddr= options.
1525 */
1526 if (protofamily != AF_UNSPEC &&
1527 protofamily != mnt->nfs_server.address.ss_family)
1528 goto out_proto_mismatch;
1529
1530 if (mountfamily != AF_UNSPEC) {
1531 if (mnt->mount_server.addrlen) {
1532 if (mountfamily != mnt->mount_server.address.ss_family)
1533 goto out_mountproto_mismatch;
1534 } else {
1535 if (mountfamily != mnt->nfs_server.address.ss_family)
1536 goto out_mountproto_mismatch;
1537 }
1538 }
1539
bf0fd768
CL		 1540 return 1;
1541
ee671b01
JL		 1542out_mountproto_mismatch:
1543 printk(KERN_INFO "NFS: mount server address does not match mountproto= "
1544 "option\n");
1545 return 0;
1546out_proto_mismatch:
1547 printk(KERN_INFO "NFS: server address does not match proto= option\n");
1548 return 0;
53a0b9c4
CL		 1549out_invalid_address:
1550 printk(KERN_INFO "NFS: bad IP address specified: %s\n", p);
1551 return 0;
d23c45fd 1552out_invalid_value:
53a0b9c4 1553 printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
d23c45fd 1554 return 0;
bf0fd768
CL		 1555out_nomem:
1556 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1557 return 0;
f9c3a380
EP		 1558out_security_failure:
1559 free_secdata(secdata);
1560 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1561 return 0;
bf0fd768
CL		 1562}
1563
ec88f28d
CL		 1564/*
1565 * Match the requested auth flavors with the list returned by
1566 * the server. Returns zero and sets the mount's authentication
1567 * flavor on success; returns -EACCES if server does not support
1568 * the requested flavor.
1569 */
1570static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
1571 struct nfs_mount_request *request)
1572{
1573 unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
1574
5eecfde6
CL		 1575 /*
1576 * Certain releases of Linux's mountd return an empty
1577 * flavor list. To prevent behavioral regression with
1578 * these servers (ie. rejecting mounts that used to
1579 * succeed), revert to pre-2.6.32 behavior (no checking)
1580 * if the returned flavor list is empty.
1581 */
1582 if (server_authlist_len == 0)
1583 return 0;
1584
ec88f28d
CL		 1585 /*
1586 * We avoid sophisticated negotiating here, as there are
1587 * plenty of cases where we can get it wrong, providing
1588 * either too little or too much security.
1589 *
1590 * RFC 2623, section 2.7 suggests we SHOULD prefer the
1591 * flavor listed first. However, some servers list
1592 * AUTH_NULL first. Our caller plants AUTH_SYS, the
1593 * preferred default, in args->auth_flavors[0] if user
1594 * didn't specify sec= mount option.
1595 */
1596 for (i = 0; i < args->auth_flavor_len; i++)
1597 for (j = 0; j < server_authlist_len; j++)
1598 if (args->auth_flavors[i] == request->auth_flavs[j]) {
1599 dfprintk(MOUNT, "NFS: using auth flavor %d\n",
1600 request->auth_flavs[j]);
1601 args->auth_flavors[0] = request->auth_flavs[j];
1602 return 0;
1603 }
1604
1605 dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
1606 nfs_umount(request);
1607 return -EACCES;
1608}
1609
0076d7b7
CL		 1610/*
1611 * Use the remote server's MOUNT service to request the NFS file handle
1612 * corresponding to the provided path.
1613 */
1614static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1615 struct nfs_fh *root_fh)
1616{
ec88f28d
CL		 1617 rpc_authflavor_t server_authlist[NFS_MAX_SECFLAVORS];
1618 unsigned int server_authlist_len = ARRAY_SIZE(server_authlist);
c5d120f8
CL		 1619 struct nfs_mount_request request = {
1620 .sap = (struct sockaddr *)
1621 &args->mount_server.address,
1622 .dirpath = args->nfs_server.export_path,
1623 .protocol = args->mount_server.protocol,
1624 .fh = root_fh,
50a737f8 1625 .noresvport = args->flags & NFS_MOUNT_NORESVPORT,
ec88f28d
CL		 1626 .auth_flav_len = &server_authlist_len,
1627 .auth_flavs = server_authlist,
6d59b8d5 1628 .net = args->net,
c5d120f8 1629 };
4c568017 1630 int status;
0076d7b7
CL		 1631
1632 if (args->mount_server.version == 0) {
8a6e5deb
TM		 1633 switch (args->version) {
1634 default:
1635 args->mount_server.version = NFS_MNT3_VERSION;
1636 break;
1637 case 2:
1638 args->mount_server.version = NFS_MNT_VERSION;
1639 }
0076d7b7 1640 }
c5d120f8 1641 request.version = args->mount_server.version;
0076d7b7 1642
33832034 1643 if (args->mount_server.hostname)
c5d120f8 1644 request.hostname = args->mount_server.hostname;
33832034 1645 else
c5d120f8 1646 request.hostname = args->nfs_server.hostname;
33832034 1647
0076d7b7
CL		 1648 /*
1649 * Construct the mount server's address.
1650 */
4c568017 1651 if (args->mount_server.address.ss_family == AF_UNSPEC) {
c5d120f8 1652 memcpy(request.sap, &args->nfs_server.address,
4c568017
CL		 1653 args->nfs_server.addrlen);
1654 args->mount_server.addrlen = args->nfs_server.addrlen;
1655 }
c5d120f8 1656 request.salen = args->mount_server.addrlen;
f5855fec 1657 nfs_set_port(request.sap, &args->mount_server.port, 0);
0076d7b7
CL		 1658
1659 /*
1660 * Now ask the mount server to map our export path
1661 * to a file handle.
1662 */
c5d120f8 1663 status = nfs_mount(&request);
ec88f28d
CL		 1664 if (status != 0) {
1665 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1666 request.hostname, status);
1667 return status;
1668 }
0076d7b7 1669
ec88f28d
CL		 1670 /*
1671 * MNTv1 (NFSv2) does not support auth flavor negotiation.
1672 */
1673 if (args->mount_server.version != NFS_MNT3_VERSION)
1674 return 0;
1675 return nfs_walk_authlist(args, &request);
0076d7b7
CL		 1676}
1677
c12bacec
RL		 1678/*
1679 * Split "dev_name" into "hostname:export_path".
1680 *
1681 * The leftmost colon demarks the split between the server's hostname
1682 * and the export path. If the hostname starts with a left square
1683 * bracket, then it may contain colons.
1684 *
1685 * Note: caller frees hostname and export path, even on error.
1686 */
1687static int nfs_parse_devname(const char *dev_name,
1688 char **hostname, size_t maxnamlen,
1689 char **export_path, size_t maxpathlen)
dc045898
CL		 1690{
1691 size_t len;
c12bacec 1692 char *end;
dc045898 1693
c12bacec
RL		 1694 /* Is the host name protected with square brakcets? */
1695 if (*dev_name == '[') {
1696 end = strchr(++dev_name, ']');
1697 if (end == NULL || end[1] != ':')
dc045898 1698 goto out_bad_devname;
dc045898 1699
c12bacec
RL		 1700 len = end - dev_name;
1701 end++;
1702 } else {
1703 char *comma;
dc045898 1704
c12bacec
RL		 1705 end = strchr(dev_name, ':');
1706 if (end == NULL)
1707 goto out_bad_devname;
1708 len = end - dev_name;
d1aa0825 1709
c12bacec
RL		 1710 /* kill possible hostname list: not supported */
1711 comma = strchr(dev_name, ',');
1712 if (comma != NULL && comma < end)
1713 *comma = 0;
1714 }
d1aa0825 1715
d1aa0825
CL		 1716 if (len > maxnamlen)
1717 goto out_hostname;
1718
1719 /* N.B. caller will free nfs_server.hostname in all cases */
c12bacec 1720 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
d1aa0825
CL		 1721 if (*hostname == NULL)
1722 goto out_nomem;
c12bacec 1723 len = strlen(++end);
d1aa0825
CL		 1724 if (len > maxpathlen)
1725 goto out_path;
1726 *export_path = kstrndup(end, len, GFP_KERNEL);
1727 if (!*export_path)
1728 goto out_nomem;
1729
c12bacec 1730 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
d1aa0825
CL		 1731 return 0;
1732
1733out_bad_devname:
1734 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1735 return -EINVAL;
1736
1737out_nomem:
1738 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1739 return -ENOMEM;
1740
1741out_hostname:
1742 dfprintk(MOUNT, "NFS: server hostname too long\n");
1743 return -ENAMETOOLONG;
1744
1745out_path:
1746 dfprintk(MOUNT, "NFS: export pathname too long\n");
1747 return -ENAMETOOLONG;
1748}
1749
f7b422b1 1750/*
54ceac45
DH		 1751 * Validate the NFS2/NFS3 mount data
1752 * - fills in the mount root filehandle
136d558c
CL		 1753 *
1754 * For option strings, user space handles the following behaviors:
1755 *
1756 * + DNS: mapping server host name to IP address ("addr=" option)
1757 *
1758 * + failure mode: how to behave if a mount request can't be handled
1759 * immediately ("fg/bg" option)
1760 *
1761 * + retry: how often to retry a mount request ("retry=" option)
1762 *
1763 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1764 * mountproto=tcp after mountproto=udp, and so on
f7b422b1 1765 */
2283f8d6
TT		 1766static int nfs_validate_mount_data(void *options,
1767 struct nfs_parsed_mount_data *args,
136d558c
CL		 1768 struct nfs_fh *mntfh,
1769 const char *dev_name)
f7b422b1 1770{
2283f8d6 1771 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
4cfd74fc 1772 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
136d558c 1773
5df36e78
CL		 1774 if (data == NULL)
1775 goto out_no_data;
f7b422b1 1776
54ceac45 1777 switch (data->version) {
5df36e78
CL		 1778 case 1:
1779 data->namlen = 0;
1780 case 2:
1781 data->bsize = 0;
1782 case 3:
1783 if (data->flags & NFS_MOUNT_VER3)
1784 goto out_no_v3;
1785 data->root.size = NFS2_FHSIZE;
1786 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1787 case 4:
1788 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1789 goto out_no_sec;
1790 case 5:
1791 memset(data->context, 0, sizeof(data->context));
1792 case 6:
b7e24457
TM		 1793 if (data->flags & NFS_MOUNT_VER3) {
1794 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1795 goto out_invalid_fh;
5df36e78 1796 mntfh->size = data->root.size;
764302cc
CL		 1797 args->version = 3;
1798 } else {
5df36e78 1799 mntfh->size = NFS2_FHSIZE;
764302cc
CL		 1800 args->version = 2;
1801 }
5df36e78 1802
5df36e78
CL		 1803
1804 memcpy(mntfh->data, data->root.data, mntfh->size);
1805 if (mntfh->size < sizeof(mntfh->data))
1806 memset(mntfh->data + mntfh->size, 0,
1807 sizeof(mntfh->data) - mntfh->size);
6e88e061 1808
2283f8d6
TT		 1809 /*
1810 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1811 * can deal with.
1812 */
ff3525a5 1813 args->flags = data->flags & NFS_MOUNT_FLAGMASK;
d5eff1a3 1814 args->flags |= NFS_MOUNT_LEGACY_INTERFACE;
2283f8d6
TT		 1815 args->rsize = data->rsize;
1816 args->wsize = data->wsize;
2283f8d6
TT		 1817 args->timeo = data->timeo;
1818 args->retrans = data->retrans;
1819 args->acregmin = data->acregmin;
1820 args->acregmax = data->acregmax;
1821 args->acdirmin = data->acdirmin;
1822 args->acdirmax = data->acdirmax;
4c568017 1823
4cfd74fc 1824 memcpy(sap, &data->addr, sizeof(data->addr));
4c568017 1825 args->nfs_server.addrlen = sizeof(data->addr);
4cfd74fc 1826 if (!nfs_verify_server_address(sap))
4c568017
CL		 1827 goto out_no_address;
1828
2283f8d6 1829 if (!(data->flags & NFS_MOUNT_TCP))
0896a725 1830 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
2283f8d6
TT		 1831 /* N.B. caller will free nfs_server.hostname in all cases */
1832 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1833 args->namlen = data->namlen;
1834 args->bsize = data->bsize;
dd07c947
CL		 1835
1836 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1837 args->auth_flavors[0] = data->pseudoflavor;
63649bd7
CG		 1838 if (!args->nfs_server.hostname)
1839 goto out_nomem;
f9c3a380 1840
5eebde23
SJ		 1841 if (!(data->flags & NFS_MOUNT_NONLM))
1842 args->flags &= ~(NFS_MOUNT_LOCAL_FLOCK|
1843 NFS_MOUNT_LOCAL_FCNTL);
1844 else
1845 args->flags |= (NFS_MOUNT_LOCAL_FLOCK|
1846 NFS_MOUNT_LOCAL_FCNTL);
f9c3a380
EP		 1847 /*
1848 * The legacy version 6 binary mount data from userspace has a
1849 * field used only to transport selinux information into the
1850 * the kernel. To continue to support that functionality we
1851 * have a touch of selinux knowledge here in the NFS code. The
1852 * userspace code converted context=blah to just blah so we are
1853 * converting back to the full string selinux understands.
1854 */
1855 if (data->context[0]){
1856#ifdef CONFIG_SECURITY_SELINUX
1857 int rc;
1858 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1859 if (!opts_str)
1860 return -ENOMEM;
1861 strcpy(opts_str, "context=");
1862 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1863 strcat(opts_str, &data->context[0]);
1864 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1865 kfree(opts_str);
1866 if (rc)
1867 return rc;
1868#else
1869 return -EINVAL;
1870#endif
1871 }
1872
5df36e78 1873 break;
136d558c 1874 default: {
136d558c 1875 int status;
136d558c 1876
2283f8d6
TT		 1877 if (nfs_parse_mount_options((char *)options, args) == 0)
1878 return -EINVAL;
136d558c 1879
4cfd74fc 1880 if (!nfs_verify_server_address(sap))
6e88e061
CL		 1881 goto out_no_address;
1882
764302cc
CL		 1883 if (args->version == 4)
1884#ifdef CONFIG_NFS_V4
1885 return nfs4_validate_text_mount_data(options,
1886 args, dev_name);
1887#else
1888 goto out_v4_not_compiled;
1889#endif
1890
f5855fec 1891 nfs_set_port(sap, &args->nfs_server.port, 0);
ed596a8a 1892
259875ef
TM		 1893 nfs_set_mount_transport_protocol(args);
1894
dc045898
CL		 1895 status = nfs_parse_devname(dev_name,
1896 &args->nfs_server.hostname,
1897 PAGE_SIZE,
1898 &args->nfs_server.export_path,
1899 NFS_MAXPATHLEN);
1900 if (!status)
1901 status = nfs_try_mount(args, mntfh);
136d558c 1902
dc045898
CL		 1903 kfree(args->nfs_server.export_path);
1904 args->nfs_server.export_path = NULL;
136d558c 1905
136d558c 1906 if (status)
fdc6e2c8 1907 return status;
136d558c 1908
136d558c
CL		 1909 break;
1910 }
f7b422b1 1911 }
54ceac45
DH		 1912
1913#ifndef CONFIG_NFS_V3
8a6e5deb 1914 if (args->version == 3)
5df36e78
CL		 1915 goto out_v3_not_compiled;
1916#endif /* !CONFIG_NFS_V3 */
f7b422b1 1917
5df36e78 1918 return 0;
f7b422b1 1919
5df36e78
CL		 1920out_no_data:
1921 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1922 return -EINVAL;
54ceac45 1923
5df36e78
CL		 1924out_no_v3:
1925 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1926 data->version);
1927 return -EINVAL;
f7b422b1 1928
5df36e78
CL		 1929out_no_sec:
1930 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1931 return -EINVAL;
1932
5df36e78
CL		 1933#ifndef CONFIG_NFS_V3
1934out_v3_not_compiled:
1935 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1936 return -EPROTONOSUPPORT;
1937#endif /* !CONFIG_NFS_V3 */
1938
764302cc
CL		 1939#ifndef CONFIG_NFS_V4
1940out_v4_not_compiled:
1941 dfprintk(MOUNT, "NFS: NFSv4 is not compiled into kernel\n");
1942 return -EPROTONOSUPPORT;
1943#endif /* !CONFIG_NFS_V4 */
1944
63649bd7
CG		 1945out_nomem:
1946 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1947 return -ENOMEM;
1948
5df36e78
CL		 1949out_no_address:
1950 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1951 return -EINVAL;
1952
1953out_invalid_fh:
1954 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1955 return -EINVAL;
f7b422b1
DH		 1956}
1957
48b605f8
JL		 1958static int
1959nfs_compare_remount_data(struct nfs_server *nfss,
1960 struct nfs_parsed_mount_data *data)
1961{
1962 if (data->flags != nfss->flags ||
1963 data->rsize != nfss->rsize ||
1964 data->wsize != nfss->wsize ||
1965 data->retrans != nfss->client->cl_timeout->to_retries ||
1966 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1967 data->acregmin != nfss->acregmin / HZ ||
1968 data->acregmax != nfss->acregmax / HZ ||
1969 data->acdirmin != nfss->acdirmin / HZ ||
1970 data->acdirmax != nfss->acdirmax / HZ ||
1971 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
bcd2ea17 1972 data->nfs_server.port != nfss->port ||
48b605f8 1973 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
a1be9eee
SR		 1974 !rpc_cmp_addr((struct sockaddr *)&data->nfs_server.address,
1975 (struct sockaddr *)&nfss->nfs_client->cl_addr))
48b605f8
JL		 1976 return -EINVAL;
1977
1978 return 0;
1979}
1980
1981static int
1982nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1983{
1984 int error;
1985 struct nfs_server *nfss = sb->s_fs_info;
1986 struct nfs_parsed_mount_data *data;
1987 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1988 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
cd100725 1989 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
48b605f8
JL		 1990
1991 /*
1992 * Userspace mount programs that send binary options generally send
1993 * them populated with default values. We have no way to know which
1994 * ones were explicitly specified. Fall back to legacy behavior and
1995 * just return success.
1996 */
31c94469
MZ		 1997 if ((nfsvers == 4 && (!options4 || options4->version == 1)) ||
1998 (nfsvers <= 3 && (!options || (options->version >= 1 &&
1999 options->version <= 6))))
48b605f8
JL		 2000 return 0;
2001
2002 data = kzalloc(sizeof(*data), GFP_KERNEL);
2003 if (data == NULL)
2004 return -ENOMEM;
2005
2006 /* fill out struct with values from existing mount */
2007 data->flags = nfss->flags;
2008 data->rsize = nfss->rsize;
2009 data->wsize = nfss->wsize;
2010 data->retrans = nfss->client->cl_timeout->to_retries;
2011 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
2012 data->acregmin = nfss->acregmin / HZ;
2013 data->acregmax = nfss->acregmax / HZ;
2014 data->acdirmin = nfss->acdirmin / HZ;
2015 data->acdirmax = nfss->acdirmax / HZ;
2016 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
bcd2ea17 2017 data->nfs_server.port = nfss->port;
48b605f8
JL		 2018 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
2019 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
2020 data->nfs_server.addrlen);
2021
2022 /* overwrite those values with any that were specified */
2023 error = nfs_parse_mount_options((char *)options, data);
2024 if (error < 0)
2025 goto out;
2026
26c4c170
JL		 2027 /*
2028 * noac is a special case. It implies -o sync, but that's not
2029 * necessarily reflected in the mtab options. do_remount_sb
2030 * will clear MS_SYNCHRONOUS if -o sync wasn't specified in the
2031 * remount options, so we have to explicitly reset it.
2032 */
2033 if (data->flags & NFS_MOUNT_NOAC)
2034 *flags |= MS_SYNCHRONOUS;
2035
48b605f8
JL		 2036 /* compare new mount options with old ones */
2037 error = nfs_compare_remount_data(nfss, data);
2038out:
2039 kfree(data);
2040 return error;
2041}
2042
f7b422b1 2043/*
54ceac45 2044 * Initialise the common bits of the superblock
f7b422b1 2045 */
54ceac45 2046static inline void nfs_initialise_sb(struct super_block *sb)
f7b422b1 2047{
54ceac45 2048 struct nfs_server *server = NFS_SB(sb);
5006a76c 2049
54ceac45 2050 sb->s_magic = NFS_SUPER_MAGIC;
f7b422b1 2051
54ceac45
DH		 2052 /* We probably want something more informative here */
2053 snprintf(sb->s_id, sizeof(sb->s_id),
2054 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
5006a76c 2055
54ceac45
DH		 2056 if (sb->s_blocksize == 0)
2057 sb->s_blocksize = nfs_block_bits(server->wsize,
2058 &sb->s_blocksize_bits);
f7b422b1 2059
32a88aa1
JA		 2060 sb->s_bdi = &server->backing_dev_info;
2061
54ceac45 2062 nfs_super_set_maxbytes(sb, server->maxfilesize);
f7b422b1
DH		 2063}
2064
2065/*
54ceac45 2066 * Finish setting up an NFS2/3 superblock
f7b422b1 2067 */
2283f8d6
TT		 2068static void nfs_fill_super(struct super_block *sb,
2069 struct nfs_parsed_mount_data *data)
f7b422b1
DH		 2070{
2071 struct nfs_server *server = NFS_SB(sb);
5006a76c 2072
54ceac45
DH		 2073 sb->s_blocksize_bits = 0;
2074 sb->s_blocksize = 0;
2075 if (data->bsize)
2076 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
f7b422b1 2077
8a6e5deb 2078 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2079 /* The VFS shouldn't apply the umask to mode bits. We will do
2080 * so ourselves when necessary.
2081 */
2082 sb->s_flags |= MS_POSIXACL;
2083 sb->s_time_gran = 1;
816724e6 2084 }
54ceac45
DH		 2085
2086 sb->s_op = &nfs_sops;
2087 nfs_initialise_sb(sb);
f7b422b1
DH		 2088}
2089
2090/*
54ceac45 2091 * Finish setting up a cloned NFS2/3 superblock
f7b422b1 2092 */
54ceac45
DH		 2093static void nfs_clone_super(struct super_block *sb,
2094 const struct super_block *old_sb)
f7b422b1 2095{
54ceac45
DH		 2096 struct nfs_server *server = NFS_SB(sb);
2097
2098 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2099 sb->s_blocksize = old_sb->s_blocksize;
2100 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2101
8a6e5deb 2102 if (server->nfs_client->rpc_ops->version == 3) {
54ceac45
DH		 2103 /* The VFS shouldn't apply the umask to mode bits. We will do
2104 * so ourselves when necessary.
f7b422b1
DH		 2105 */
2106 sb->s_flags |= MS_POSIXACL;
f7b422b1 2107 sb->s_time_gran = 1;
f7b422b1
DH		 2108 }
2109
54ceac45
DH		 2110 sb->s_op = old_sb->s_op;
2111 nfs_initialise_sb(sb);
f7b422b1
DH		 2112}
2113
275a5d24
TM		 2114static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
2115{
2116 const struct nfs_server *a = s->s_fs_info;
2117 const struct rpc_clnt *clnt_a = a->client;
2118 const struct rpc_clnt *clnt_b = b->client;
2119
2120 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
2121 goto Ebusy;
2122 if (a->nfs_client != b->nfs_client)
2123 goto Ebusy;
2124 if (a->flags != b->flags)
2125 goto Ebusy;
2126 if (a->wsize != b->wsize)
2127 goto Ebusy;
2128 if (a->rsize != b->rsize)
2129 goto Ebusy;
2130 if (a->acregmin != b->acregmin)
2131 goto Ebusy;
2132 if (a->acregmax != b->acregmax)
2133 goto Ebusy;
2134 if (a->acdirmin != b->acdirmin)
2135 goto Ebusy;
2136 if (a->acdirmax != b->acdirmax)
2137 goto Ebusy;
2138 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
2139 goto Ebusy;
e89a5a43 2140 return 1;
275a5d24 2141Ebusy:
e89a5a43
TM		 2142 return 0;
2143}
2144
2145struct nfs_sb_mountdata {
2146 struct nfs_server *server;
2147 int mntflags;
2148};
2149
2150static int nfs_set_super(struct super_block *s, void *data)
2151{
2152 struct nfs_sb_mountdata *sb_mntdata = data;
2153 struct nfs_server *server = sb_mntdata->server;
2154 int ret;
2155
2156 s->s_flags = sb_mntdata->mntflags;
2157 s->s_fs_info = server;
8b244ff2 2158 s->s_d_op = server->nfs_client->rpc_ops->dentry_ops;
e89a5a43
TM		 2159 ret = set_anon_super(s, server);
2160 if (ret == 0)
2161 server->s_dev = s->s_dev;
2162 return ret;
2163}
2164
fd00a8ff
CL		 2165static int nfs_compare_super_address(struct nfs_server *server1,
2166 struct nfs_server *server2)
2167{
2168 struct sockaddr *sap1, *sap2;
2169
2170 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
2171 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
2172
2173 if (sap1->sa_family != sap2->sa_family)
2174 return 0;
2175
2176 switch (sap1->sa_family) {
2177 case AF_INET: {
2178 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
2179 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
2180 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
2181 return 0;
2182 if (sin1->sin_port != sin2->sin_port)
2183 return 0;
2184 break;
2185 }
2186 case AF_INET6: {
2187 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
2188 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
2189 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
2190 return 0;
2191 if (sin1->sin6_port != sin2->sin6_port)
2192 return 0;
2193 break;
2194 }
2195 default:
2196 return 0;
2197 }
2198
2199 return 1;
2200}
2201
e89a5a43
TM		 2202static int nfs_compare_super(struct super_block *sb, void *data)
2203{
2204 struct nfs_sb_mountdata *sb_mntdata = data;
2205 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
2206 int mntflags = sb_mntdata->mntflags;
2207
fd00a8ff 2208 if (!nfs_compare_super_address(old, server))
e89a5a43
TM		 2209 return 0;
2210 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
2211 if (old->flags & NFS_MOUNT_UNSHARED)
2212 return 0;
2213 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
2214 return 0;
2215 return nfs_compare_mount_options(sb, server, mntflags);
275a5d24
TM		 2216}
2217
fa799759
MS		 2218static int nfs_bdi_register(struct nfs_server *server)
2219{
2220 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
2221}
2222
01194981
AV		 2223static struct dentry *nfs_fs_mount(struct file_system_type *fs_type,
2224 int flags, const char *dev_name, void *raw_data)
f7b422b1 2225{
f7b422b1
DH		 2226 struct nfs_server *server = NULL;
2227 struct super_block *s;
33852a1f
TM		 2228 struct nfs_parsed_mount_data *data;
2229 struct nfs_fh *mntfh;
01194981 2230 struct dentry *mntroot = ERR_PTR(-ENOMEM);
75180df2 2231 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2232 struct nfs_sb_mountdata sb_mntdata = {
2233 .mntflags = flags,
2234 };
01194981 2235 int error;
33852a1f 2236
1e657bd5 2237 data = nfs_alloc_parsed_mount_data(NFS_DEFAULT_VERSION);
b157b06c 2238 mntfh = nfs_alloc_fhandle();
33852a1f 2239 if (data == NULL || mntfh == NULL)
8a0d551a 2240 goto out;
f9c3a380 2241
54ceac45 2242 /* Validate the mount data */
33852a1f 2243 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
01194981
AV		 2244 if (error < 0) {
2245 mntroot = ERR_PTR(error);
0655960f 2246 goto out;
01194981 2247 }
f7b422b1 2248
764302cc
CL		 2249#ifdef CONFIG_NFS_V4
2250 if (data->version == 4) {
01194981 2251 mntroot = nfs4_try_mount(flags, dev_name, data);
764302cc
CL		 2252 goto out;
2253 }
2254#endif /* CONFIG_NFS_V4 */
2255
54ceac45 2256 /* Get a volume representation */
33852a1f 2257 server = nfs_create_server(data, mntfh);
54ceac45 2258 if (IS_ERR(server)) {
01194981 2259 mntroot = ERR_CAST(server);
0655960f 2260 goto out;
f7b422b1 2261 }
e89a5a43 2262 sb_mntdata.server = server;
f7b422b1 2263
75180df2
TM		 2264 if (server->flags & NFS_MOUNT_UNSHARED)
2265 compare_super = NULL;
2266
fb2088cc
SP		 2267 /* -o noac implies -o sync */
2268 if (server->flags & NFS_MOUNT_NOAC)
2269 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2270
54ceac45 2271 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2272 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6 2273 if (IS_ERR(s)) {
01194981 2274 mntroot = ERR_CAST(s);
54ceac45 2275 goto out_err_nosb;
816724e6
TM		 2276 }
2277
54ceac45
DH		 2278 if (s->s_fs_info != server) {
2279 nfs_free_server(server);
2280 server = NULL;
fa799759
MS		 2281 } else {
2282 error = nfs_bdi_register(server);
01194981
AV		 2283 if (error) {
2284 mntroot = ERR_PTR(error);
cfbc0683 2285 goto error_splat_bdi;
01194981 2286 }
54ceac45 2287 }
f7b422b1 2288
54ceac45
DH		 2289 if (!s->s_root) {
2290 /* initial superblock/root creation */
33852a1f 2291 nfs_fill_super(s, data);
160bc160 2292 nfs_fscache_get_super_cookie(s, data->fscache_uniq, NULL);
54ceac45 2293 }
f7b422b1 2294
0d5839ad 2295 mntroot = nfs_get_root(s, mntfh, dev_name);
01194981 2296 if (IS_ERR(mntroot))
54ceac45 2297 goto error_splat_super;
816724e6 2298
33852a1f 2299 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
f9c3a380
EP		 2300 if (error)
2301 goto error_splat_root;
2302
54ceac45 2303 s->s_flags |= MS_ACTIVE;
0655960f
CL		 2304
2305out:
8a0d551a 2306 nfs_free_parsed_mount_data(data);
b157b06c 2307 nfs_free_fhandle(mntfh);
01194981 2308 return mntroot;
816724e6 2309
54ceac45
DH		 2310out_err_nosb:
2311 nfs_free_server(server);
0655960f 2312 goto out;
54ceac45 2313
f9c3a380
EP		 2314error_splat_root:
2315 dput(mntroot);
01194981 2316 mntroot = ERR_PTR(error);
54ceac45 2317error_splat_super:
cfbc0683
N		 2318 if (server && !s->s_root)
2319 bdi_unregister(&server->backing_dev_info);
2320error_splat_bdi:
6f5bbff9 2321 deactivate_locked_super(s);
0655960f 2322 goto out;
f7b422b1
DH		 2323}
2324
387c149b
TM		 2325/*
2326 * Ensure that we unregister the bdi before kill_anon_super
2327 * releases the device name
2328 */
2329static void nfs_put_super(struct super_block *s)
2330{
2331 struct nfs_server *server = NFS_SB(s);
2332
2333 bdi_unregister(&server->backing_dev_info);
2334}
2335
54ceac45
DH		 2336/*
2337 * Destroy an NFS2/3 superblock
2338 */
f7b422b1
DH		 2339static void nfs_kill_super(struct super_block *s)
2340{
2341 struct nfs_server *server = NFS_SB(s);
2342
2343 kill_anon_super(s);
08734048 2344 nfs_fscache_release_super_cookie(s);
54ceac45 2345 nfs_free_server(server);
f7b422b1
DH		 2346}
2347
54ceac45
DH		 2348/*
2349 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
2350 */
31f43471
AV		 2351static struct dentry *
2352nfs_xdev_mount(struct file_system_type *fs_type, int flags,
2353 const char *dev_name, void *raw_data)
f7b422b1
DH		 2354{
2355 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2356 struct super_block *s;
2357 struct nfs_server *server;
2358 struct dentry *mntroot;
75180df2 2359 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2360 struct nfs_sb_mountdata sb_mntdata = {
2361 .mntflags = flags,
2362 };
54ceac45 2363 int error;
f7b422b1 2364
31f43471 2365 dprintk("--> nfs_xdev_mount()\n");
f7b422b1 2366
54ceac45
DH		 2367 /* create a new volume representation */
2368 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2369 if (IS_ERR(server)) {
2370 error = PTR_ERR(server);
2371 goto out_err_noserver;
2372 }
e89a5a43 2373 sb_mntdata.server = server;
8fa5c000 2374
75180df2
TM		 2375 if (server->flags & NFS_MOUNT_UNSHARED)
2376 compare_super = NULL;
2377
fb2088cc
SP		 2378 /* -o noac implies -o sync */
2379 if (server->flags & NFS_MOUNT_NOAC)
2380 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2381
54ceac45 2382 /* Get a superblock - note that we may end up sharing one that already exists */
e89a5a43 2383 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2384 if (IS_ERR(s)) {
2385 error = PTR_ERR(s);
2386 goto out_err_nosb;
2387 }
5006a76c 2388
54ceac45
DH		 2389 if (s->s_fs_info != server) {
2390 nfs_free_server(server);
2391 server = NULL;
fa799759
MS		 2392 } else {
2393 error = nfs_bdi_register(server);
2394 if (error)
cfbc0683 2395 goto error_splat_bdi;
f7b422b1 2396 }
24c8dbbb 2397
54ceac45
DH		 2398 if (!s->s_root) {
2399 /* initial superblock/root creation */
54ceac45 2400 nfs_clone_super(s, data->sb);
2df54806 2401 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2402 }
f7b422b1 2403
0d5839ad 2404 mntroot = nfs_get_root(s, data->fh, dev_name);
54ceac45
DH		 2405 if (IS_ERR(mntroot)) {
2406 error = PTR_ERR(mntroot);
2407 goto error_splat_super;
f7b422b1 2408 }
e9cc6c23 2409 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
4c1fe2f7
NB		 2410 dput(mntroot);
2411 error = -ESTALE;
2412 goto error_splat_super;
2413 }
f7b422b1 2414
54ceac45 2415 s->s_flags |= MS_ACTIVE;
f7b422b1 2416
f9c3a380
EP		 2417 /* clone any lsm security options from the parent to the new sb */
2418 security_sb_clone_mnt_opts(data->sb, s);
2419
31f43471
AV		 2420 dprintk("<-- nfs_xdev_mount() = 0\n");
2421 return mntroot;
24c8dbbb 2422
54ceac45
DH		 2423out_err_nosb:
2424 nfs_free_server(server);
2425out_err_noserver:
31f43471
AV		 2426 dprintk("<-- nfs_xdev_mount() = %d [error]\n", error);
2427 return ERR_PTR(error);
f7b422b1 2428
54ceac45 2429error_splat_super:
cfbc0683
N		 2430 if (server && !s->s_root)
2431 bdi_unregister(&server->backing_dev_info);
2432error_splat_bdi:
6f5bbff9 2433 deactivate_locked_super(s);
31f43471
AV		 2434 dprintk("<-- nfs_xdev_mount() = %d [splat]\n", error);
2435 return ERR_PTR(error);
f7b422b1
DH		 2436}
2437
54ceac45
DH		 2438#ifdef CONFIG_NFS_V4
2439
f7b422b1 2440/*
54ceac45 2441 * Finish setting up a cloned NFS4 superblock
f7b422b1 2442 */
54ceac45
DH		 2443static void nfs4_clone_super(struct super_block *sb,
2444 const struct super_block *old_sb)
f7b422b1 2445{
54ceac45
DH		 2446 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2447 sb->s_blocksize = old_sb->s_blocksize;
2448 sb->s_maxbytes = old_sb->s_maxbytes;
f7b422b1 2449 sb->s_time_gran = 1;
54ceac45 2450 sb->s_op = old_sb->s_op;
a8a5da99
AK		 2451 /*
2452 * The VFS shouldn't apply the umask to mode bits. We will do
2453 * so ourselves when necessary.
2454 */
2455 sb->s_flags |= MS_POSIXACL;
64c2ce8b
AK		 2456 sb->s_xattr = old_sb->s_xattr;
2457 nfs_initialise_sb(sb);
f7b422b1
DH		 2458}
2459
54ceac45
DH		 2460/*
2461 * Set up an NFS4 superblock
2462 */
2463static void nfs4_fill_super(struct super_block *sb)
f7b422b1 2464{
54ceac45
DH		 2465 sb->s_time_gran = 1;
2466 sb->s_op = &nfs4_sops;
a8a5da99
AK		 2467 /*
2468 * The VFS shouldn't apply the umask to mode bits. We will do
2469 * so ourselves when necessary.
2470 */
2471 sb->s_flags |= MS_POSIXACL;
64c2ce8b 2472 sb->s_xattr = nfs4_xattr_handlers;
54ceac45 2473 nfs_initialise_sb(sb);
f7b422b1
DH		 2474}
2475
01c3f052
TM		 2476static void nfs4_validate_mount_flags(struct nfs_parsed_mount_data *args)
2477{
5eebde23
SJ		 2478 args->flags &= ~(NFS_MOUNT_NONLM|NFS_MOUNT_NOACL|NFS_MOUNT_VER3|
2479 NFS_MOUNT_LOCAL_FLOCK|NFS_MOUNT_LOCAL_FCNTL);
01c3f052
TM		 2480}
2481
7630c852
CL		 2482static int nfs4_validate_text_mount_data(void *options,
2483 struct nfs_parsed_mount_data *args,
2484 const char *dev_name)
2485{
2486 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
2487
f5855fec 2488 nfs_set_port(sap, &args->nfs_server.port, NFS_PORT);
7630c852
CL		 2489
2490 nfs_validate_transport_protocol(args);
2491
2492 nfs4_validate_mount_flags(args);
2493
2ecda72b
TM		 2494 if (args->version != 4) {
2495 dfprintk(MOUNT,
2496 "NFS4: Illegal mount version\n");
2497 return -EINVAL;
2498 }
2499
7630c852
CL		 2500 if (args->auth_flavor_len > 1) {
2501 dfprintk(MOUNT,
2502 "NFS4: Too many RPC auth flavours specified\n");
2503 return -EINVAL;
2504 }
2505
2506 if (args->client_address == NULL) {
2507 dfprintk(MOUNT,
2508 "NFS4: mount program didn't pass callback address\n");
2509 return -EINVAL;
2510 }
2511
2512 return nfs_parse_devname(dev_name,
2513 &args->nfs_server.hostname,
2514 NFS4_MAXNAMLEN,
2515 &args->nfs_server.export_path,
2516 NFS4_MAXPATHLEN);
2517}
2518
f0768ebd
CL		 2519/*
2520 * Validate NFSv4 mount options
2521 */
91ea40b9
TT		 2522static int nfs4_validate_mount_data(void *options,
2523 struct nfs_parsed_mount_data *args,
2524 const char *dev_name)
f0768ebd 2525{
4cfd74fc 2526 struct sockaddr *sap = (struct sockaddr *)&args->nfs_server.address;
91ea40b9 2527 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
f0768ebd
CL		 2528 char *c;
2529
2530 if (data == NULL)
2531 goto out_no_data;
2532
2533 switch (data->version) {
2534 case 1:
4c568017
CL		 2535 if (data->host_addrlen > sizeof(args->nfs_server.address))
2536 goto out_no_address;
2537 if (data->host_addrlen == 0)
f0768ebd 2538 goto out_no_address;
4c568017 2539 args->nfs_server.addrlen = data->host_addrlen;
4cfd74fc 2540 if (copy_from_user(sap, data->host_addr, data->host_addrlen))
f0768ebd 2541 return -EFAULT;
4cfd74fc 2542 if (!nfs_verify_server_address(sap))
f0768ebd
CL		 2543 goto out_no_address;
2544
6738b251
CL		 2545 if (data->auth_flavourlen) {
2546 if (data->auth_flavourlen > 1)
2547 goto out_inval_auth;
20c71f5e 2548 if (copy_from_user(&args->auth_flavors[0],
91ea40b9 2549 data->auth_flavours,
20c71f5e 2550 sizeof(args->auth_flavors[0])))
f0768ebd 2551 return -EFAULT;
f0768ebd
CL		 2552 }
2553
2554 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2555 if (IS_ERR(c))
2556 return PTR_ERR(c);
91ea40b9 2557 args->nfs_server.hostname = c;
f0768ebd
CL		 2558
2559 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2560 if (IS_ERR(c))
2561 return PTR_ERR(c);
91ea40b9
TT		 2562 args->nfs_server.export_path = c;
2563 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
f0768ebd
CL		 2564
2565 c = strndup_user(data->client_addr.data, 16);
2566 if (IS_ERR(c))
2567 return PTR_ERR(c);
91ea40b9
TT		 2568 args->client_address = c;
2569
2570 /*
2571 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2572 * can deal with.
2573 */
2574
2575 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2576 args->rsize = data->rsize;
2577 args->wsize = data->wsize;
2578 args->timeo = data->timeo;
2579 args->retrans = data->retrans;
2580 args->acregmin = data->acregmin;
2581 args->acregmax = data->acregmax;
2582 args->acdirmin = data->acdirmin;
2583 args->acdirmax = data->acdirmax;
2584 args->nfs_server.protocol = data->proto;
259875ef 2585 nfs_validate_transport_protocol(args);
f0768ebd
CL		 2586
2587 break;
7630c852 2588 default:
91ea40b9 2589 if (nfs_parse_mount_options((char *)options, args) == 0)
80071225
CL		 2590 return -EINVAL;
2591
4cfd74fc 2592 if (!nfs_verify_server_address(sap))
80071225 2593 return -EINVAL;
dc045898 2594
7630c852 2595 return nfs4_validate_text_mount_data(options, args, dev_name);
f0768ebd
CL		 2596 }
2597
2598 return 0;
2599
2600out_no_data:
2601 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2602 return -EINVAL;
2603
2604out_inval_auth:
2605 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2606 data->auth_flavourlen);
2607 return -EINVAL;
2608
2609out_no_address:
2610 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2611 return -EINVAL;
f0768ebd
CL		 2612}
2613
54ceac45 2614/*
c02d7adf 2615 * Get the superblock for the NFS4 root partition
54ceac45 2616 */
31f43471
AV		 2617static struct dentry *
2618nfs4_remote_mount(struct file_system_type *fs_type, int flags,
2619 const char *dev_name, void *raw_data)
f7b422b1 2620{
c02d7adf 2621 struct nfs_parsed_mount_data *data = raw_data;
54ceac45
DH		 2622 struct super_block *s;
2623 struct nfs_server *server;
33852a1f 2624 struct nfs_fh *mntfh;
54ceac45 2625 struct dentry *mntroot;
75180df2 2626 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2627 struct nfs_sb_mountdata sb_mntdata = {
2628 .mntflags = flags,
2629 };
33852a1f
TM		 2630 int error = -ENOMEM;
2631
b157b06c 2632 mntfh = nfs_alloc_fhandle();
33852a1f 2633 if (data == NULL || mntfh == NULL)
8a0d551a 2634 goto out;
f9c3a380 2635
54ceac45 2636 /* Get a volume representation */
33852a1f 2637 server = nfs4_create_server(data, mntfh);
54ceac45
DH		 2638 if (IS_ERR(server)) {
2639 error = PTR_ERR(server);
29eb981a 2640 goto out;
f7b422b1 2641 }
e89a5a43 2642 sb_mntdata.server = server;
f7b422b1 2643
75180df2
TM		 2644 if (server->flags & NFS4_MOUNT_UNSHARED)
2645 compare_super = NULL;
2646
fb2088cc
SP		 2647 /* -o noac implies -o sync */
2648 if (server->flags & NFS_MOUNT_NOAC)
2649 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2650
54ceac45 2651 /* Get a superblock - note that we may end up sharing one that already exists */
c02d7adf 2652 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
816724e6
TM		 2653 if (IS_ERR(s)) {
2654 error = PTR_ERR(s);
f7b422b1 2655 goto out_free;
816724e6
TM		 2656 }
2657
5dd3177a
TM		 2658 if (s->s_fs_info != server) {
2659 nfs_free_server(server);
2660 server = NULL;
fa799759
MS		 2661 } else {
2662 error = nfs_bdi_register(server);
2663 if (error)
cfbc0683 2664 goto error_splat_bdi;
5dd3177a
TM		 2665 }
2666
54ceac45
DH		 2667 if (!s->s_root) {
2668 /* initial superblock/root creation */
54ceac45 2669 nfs4_fill_super(s);
2df54806
DH		 2670 nfs_fscache_get_super_cookie(
2671 s, data ? data->fscache_uniq : NULL, NULL);
54ceac45 2672 }
f7b422b1 2673
0d5839ad 2674 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 2675 if (IS_ERR(mntroot)) {
2676 error = PTR_ERR(mntroot);
2677 goto error_splat_super;
f7b422b1 2678 }
54ceac45 2679
33852a1f 2680 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
46c8ac74
EP		 2681 if (error)
2682 goto error_splat_root;
2683
f7b422b1 2684 s->s_flags |= MS_ACTIVE;
31f43471 2685
31f43471
AV		 2686 nfs_free_fhandle(mntfh);
2687 return mntroot;
29eb981a
CL		 2688
2689out:
b157b06c 2690 nfs_free_fhandle(mntfh);
31f43471 2691 return ERR_PTR(error);
54ceac45 2692
f7b422b1 2693out_free:
54ceac45 2694 nfs_free_server(server);
29eb981a 2695 goto out;
54ceac45 2696
46c8ac74
EP		 2697error_splat_root:
2698 dput(mntroot);
54ceac45 2699error_splat_super:
cfbc0683
N		 2700 if (server && !s->s_root)
2701 bdi_unregister(&server->backing_dev_info);
2702error_splat_bdi:
6f5bbff9 2703 deactivate_locked_super(s);
29eb981a 2704 goto out;
f7b422b1
DH		 2705}
2706
c02d7adf
TM		 2707static struct vfsmount *nfs_do_root_mount(struct file_system_type *fs_type,
2708 int flags, void *data, const char *hostname)
2709{
2710 struct vfsmount *root_mnt;
2711 char *root_devname;
2712 size_t len;
2713
2714 len = strlen(hostname) + 3;
2715 root_devname = kmalloc(len, GFP_KERNEL);
2716 if (root_devname == NULL)
2717 return ERR_PTR(-ENOMEM);
2718 snprintf(root_devname, len, "%s:/", hostname);
2719 root_mnt = vfs_kern_mount(fs_type, flags, root_devname, data);
2720 kfree(root_devname);
2721 return root_mnt;
2722}
2723
ce587e07
TM		 2724struct nfs_referral_count {
2725 struct list_head list;
2726 const struct task_struct *task;
2727 unsigned int referral_count;
2728};
2729
2730static LIST_HEAD(nfs_referral_count_list);
2731static DEFINE_SPINLOCK(nfs_referral_count_list_lock);
2732
2733static struct nfs_referral_count *nfs_find_referral_count(void)
2734{
2735 struct nfs_referral_count *p;
2736
2737 list_for_each_entry(p, &nfs_referral_count_list, list) {
2738 if (p->task == current)
2739 return p;
2740 }
2741 return NULL;
2742}
2743
2744#define NFS_MAX_NESTED_REFERRALS 2
2745
2746static int nfs_referral_loop_protect(void)
2747{
2748 struct nfs_referral_count *p, *new;
2749 int ret = -ENOMEM;
2750
2751 new = kmalloc(sizeof(*new), GFP_KERNEL);
2752 if (!new)
2753 goto out;
2754 new->task = current;
2755 new->referral_count = 1;
2756
2757 ret = 0;
2758 spin_lock(&nfs_referral_count_list_lock);
2759 p = nfs_find_referral_count();
2760 if (p != NULL) {
2761 if (p->referral_count >= NFS_MAX_NESTED_REFERRALS)
2762 ret = -ELOOP;
2763 else
2764 p->referral_count++;
2765 } else {
2766 list_add(&new->list, &nfs_referral_count_list);
2767 new = NULL;
2768 }
2769 spin_unlock(&nfs_referral_count_list_lock);
2770 kfree(new);
2771out:
2772 return ret;
2773}
2774
2775static void nfs_referral_loop_unprotect(void)
2776{
2777 struct nfs_referral_count *p;
2778
2779 spin_lock(&nfs_referral_count_list_lock);
2780 p = nfs_find_referral_count();
2781 p->referral_count--;
2782 if (p->referral_count == 0)
2783 list_del(&p->list);
2784 else
2785 p = NULL;
2786 spin_unlock(&nfs_referral_count_list_lock);
2787 kfree(p);
2788}
2789
01194981
AV		 2790static struct dentry *nfs_follow_remote_path(struct vfsmount *root_mnt,
2791 const char *export_path)
c02d7adf 2792{
01194981 2793 struct dentry *dentry;
5352d3b6 2794 int err;
c02d7adf 2795
5352d3b6
AV		 2796 if (IS_ERR(root_mnt))
2797 return ERR_CAST(root_mnt);
2798
2799 err = nfs_referral_loop_protect();
2800 if (err) {
ea441d11 2801 mntput(root_mnt);
5352d3b6 2802 return ERR_PTR(err);
ea441d11 2803 }
c02d7adf 2804
ea441d11
AV		 2805 dentry = mount_subtree(root_mnt, export_path);
2806 nfs_referral_loop_unprotect();
c02d7adf 2807
01194981 2808 return dentry;
c02d7adf
TM		 2809}
2810
01194981
AV		 2811static struct dentry *nfs4_try_mount(int flags, const char *dev_name,
2812 struct nfs_parsed_mount_data *data)
a6fe23be
CL		 2813{
2814 char *export_path;
2815 struct vfsmount *root_mnt;
01194981 2816 struct dentry *res;
a6fe23be
CL		 2817
2818 dfprintk(MOUNT, "--> nfs4_try_mount()\n");
2819
2820 export_path = data->nfs_server.export_path;
2821 data->nfs_server.export_path = "/";
2822 root_mnt = nfs_do_root_mount(&nfs4_remote_fs_type, flags, data,
2823 data->nfs_server.hostname);
2824 data->nfs_server.export_path = export_path;
2825
5352d3b6 2826 res = nfs_follow_remote_path(root_mnt, export_path);
a6fe23be 2827
01194981
AV		 2828 dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
2829 IS_ERR(res) ? PTR_ERR(res) : 0,
2830 IS_ERR(res) ? " [error]" : "");
2831 return res;
a6fe23be
CL		 2832}
2833
c02d7adf
TM		 2834/*
2835 * Get the superblock for an NFS4 mountpoint
2836 */
01194981
AV		 2837static struct dentry *nfs4_mount(struct file_system_type *fs_type,
2838 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 2839{
2840 struct nfs_parsed_mount_data *data;
c02d7adf 2841 int error = -ENOMEM;
01194981 2842 struct dentry *res = ERR_PTR(-ENOMEM);
c02d7adf 2843
c5811dbd 2844 data = nfs_alloc_parsed_mount_data(4);
c02d7adf 2845 if (data == NULL)
8a0d551a 2846 goto out;
c02d7adf
TM		 2847
2848 /* Validate the mount data */
2849 error = nfs4_validate_mount_data(raw_data, data, dev_name);
01194981
AV		 2850 if (error < 0) {
2851 res = ERR_PTR(error);
c02d7adf 2852 goto out;
01194981 2853 }
c02d7adf 2854
01194981
AV		 2855 res = nfs4_try_mount(flags, dev_name, data);
2856 if (IS_ERR(res))
2857 error = PTR_ERR(res);
c02d7adf
TM		 2858
2859out:
8a0d551a 2860 nfs_free_parsed_mount_data(data);
01194981 2861 dprintk("<-- nfs4_mount() = %d%s\n", error,
c02d7adf 2862 error != 0 ? " [error]" : "");
01194981 2863 return res;
c02d7adf
TM		 2864}
2865
f7b422b1
DH		 2866static void nfs4_kill_super(struct super_block *sb)
2867{
2868 struct nfs_server *server = NFS_SB(sb);
2869
0f3e66c6 2870 dprintk("--> %s\n", __func__);
515d8611 2871 nfs_super_return_all_delegations(sb);
f7b422b1 2872 kill_anon_super(sb);
08734048 2873 nfs_fscache_release_super_cookie(sb);
54ceac45 2874 nfs_free_server(server);
0f3e66c6 2875 dprintk("<-- %s\n", __func__);
f7b422b1
DH		 2876}
2877
2878/*
54ceac45 2879 * Clone an NFS4 server record on xdev traversal (FSID-change)
f7b422b1 2880 */
31f43471
AV		 2881static struct dentry *
2882nfs4_xdev_mount(struct file_system_type *fs_type, int flags,
2883 const char *dev_name, void *raw_data)
f7b422b1 2884{
54ceac45
DH		 2885 struct nfs_clone_mount *data = raw_data;
2886 struct super_block *s;
2887 struct nfs_server *server;
2888 struct dentry *mntroot;
75180df2 2889 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2890 struct nfs_sb_mountdata sb_mntdata = {
2891 .mntflags = flags,
2892 };
54ceac45 2893 int error;
f7b422b1 2894
31f43471 2895 dprintk("--> nfs4_xdev_mount()\n");
f7b422b1 2896
54ceac45
DH		 2897 /* create a new volume representation */
2898 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2899 if (IS_ERR(server)) {
2900 error = PTR_ERR(server);
2901 goto out_err_noserver;
f7b422b1 2902 }
e89a5a43 2903 sb_mntdata.server = server;
f7b422b1 2904
75180df2
TM		 2905 if (server->flags & NFS4_MOUNT_UNSHARED)
2906 compare_super = NULL;
2907
fb2088cc
SP		 2908 /* -o noac implies -o sync */
2909 if (server->flags & NFS_MOUNT_NOAC)
2910 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
2911
54ceac45 2912 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 2913 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 2914 if (IS_ERR(s)) {
2915 error = PTR_ERR(s);
2916 goto out_err_nosb;
f7b422b1 2917 }
f7b422b1 2918
54ceac45
DH		 2919 if (s->s_fs_info != server) {
2920 nfs_free_server(server);
2921 server = NULL;
fa799759
MS		 2922 } else {
2923 error = nfs_bdi_register(server);
2924 if (error)
cfbc0683 2925 goto error_splat_bdi;
54ceac45 2926 }
f7b422b1 2927
54ceac45
DH		 2928 if (!s->s_root) {
2929 /* initial superblock/root creation */
54ceac45 2930 nfs4_clone_super(s, data->sb);
2df54806 2931 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45 2932 }
f7b422b1 2933
0d5839ad 2934 mntroot = nfs4_get_root(s, data->fh, dev_name);
54ceac45
DH		 2935 if (IS_ERR(mntroot)) {
2936 error = PTR_ERR(mntroot);
2937 goto error_splat_super;
2938 }
e9cc6c23
TM		 2939 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2940 dput(mntroot);
2941 error = -ESTALE;
2942 goto error_splat_super;
2943 }
f7b422b1 2944
54ceac45 2945 s->s_flags |= MS_ACTIVE;
54ceac45 2946
46c8ac74
EP		 2947 security_sb_clone_mnt_opts(data->sb, s);
2948
31f43471
AV		 2949 dprintk("<-- nfs4_xdev_mount() = 0\n");
2950 return mntroot;
54ceac45
DH		 2951
2952out_err_nosb:
2953 nfs_free_server(server);
2954out_err_noserver:
31f43471
AV		 2955 dprintk("<-- nfs4_xdev_mount() = %d [error]\n", error);
2956 return ERR_PTR(error);
54ceac45
DH		 2957
2958error_splat_super:
cfbc0683
N		 2959 if (server && !s->s_root)
2960 bdi_unregister(&server->backing_dev_info);
2961error_splat_bdi:
6f5bbff9 2962 deactivate_locked_super(s);
31f43471
AV		 2963 dprintk("<-- nfs4_xdev_mount() = %d [splat]\n", error);
2964 return ERR_PTR(error);
f7b422b1
DH		 2965}
2966
31f43471
AV		 2967static struct dentry *
2968nfs4_remote_referral_mount(struct file_system_type *fs_type, int flags,
2969 const char *dev_name, void *raw_data)
f7b422b1
DH		 2970{
2971 struct nfs_clone_mount *data = raw_data;
54ceac45
DH		 2972 struct super_block *s;
2973 struct nfs_server *server;
2974 struct dentry *mntroot;
4f727296 2975 struct nfs_fh *mntfh;
75180df2 2976 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
e89a5a43
TM		 2977 struct nfs_sb_mountdata sb_mntdata = {
2978 .mntflags = flags,
2979 };
4f727296 2980 int error = -ENOMEM;
54ceac45
DH		 2981
2982 dprintk("--> nfs4_referral_get_sb()\n");
2983
4f727296
TM		 2984 mntfh = nfs_alloc_fhandle();
2985 if (mntfh == NULL)
2986 goto out_err_nofh;
2987
54ceac45 2988 /* create a new volume representation */
4f727296 2989 server = nfs4_create_referral_server(data, mntfh);
54ceac45
DH		 2990 if (IS_ERR(server)) {
2991 error = PTR_ERR(server);
2992 goto out_err_noserver;
2993 }
e89a5a43 2994 sb_mntdata.server = server;
54ceac45 2995
75180df2
TM		 2996 if (server->flags & NFS4_MOUNT_UNSHARED)
2997 compare_super = NULL;
2998
fb2088cc
SP		 2999 /* -o noac implies -o sync */
3000 if (server->flags & NFS_MOUNT_NOAC)
3001 sb_mntdata.mntflags |= MS_SYNCHRONOUS;
3002
54ceac45 3003 /* Get a superblock - note that we may end up sharing one that already exists */
ec9a05c9 3004 s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
54ceac45
DH		 3005 if (IS_ERR(s)) {
3006 error = PTR_ERR(s);
3007 goto out_err_nosb;
3008 }
3009
3010 if (s->s_fs_info != server) {
3011 nfs_free_server(server);
3012 server = NULL;
fa799759
MS		 3013 } else {
3014 error = nfs_bdi_register(server);
3015 if (error)
cfbc0683 3016 goto error_splat_bdi;
54ceac45
DH		 3017 }
3018
3019 if (!s->s_root) {
3020 /* initial superblock/root creation */
54ceac45 3021 nfs4_fill_super(s);
2df54806 3022 nfs_fscache_get_super_cookie(s, NULL, data);
54ceac45
DH		 3023 }
3024
0d5839ad 3025 mntroot = nfs4_get_root(s, mntfh, dev_name);
54ceac45
DH		 3026 if (IS_ERR(mntroot)) {
3027 error = PTR_ERR(mntroot);
3028 goto error_splat_super;
3029 }
e9cc6c23
TM		 3030 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
3031 dput(mntroot);
3032 error = -ESTALE;
3033 goto error_splat_super;
3034 }
54ceac45
DH		 3035
3036 s->s_flags |= MS_ACTIVE;
54ceac45 3037
46c8ac74
EP		 3038 security_sb_clone_mnt_opts(data->sb, s);
3039
4f727296 3040 nfs_free_fhandle(mntfh);
54ceac45 3041 dprintk("<-- nfs4_referral_get_sb() = 0\n");
31f43471 3042 return mntroot;
54ceac45
DH		 3043
3044out_err_nosb:
3045 nfs_free_server(server);
3046out_err_noserver:
4f727296
TM		 3047 nfs_free_fhandle(mntfh);
3048out_err_nofh:
54ceac45 3049 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
31f43471 3050 return ERR_PTR(error);
54ceac45
DH		 3051
3052error_splat_super:
cfbc0683
N		 3053 if (server && !s->s_root)
3054 bdi_unregister(&server->backing_dev_info);
3055error_splat_bdi:
6f5bbff9 3056 deactivate_locked_super(s);
4f727296 3057 nfs_free_fhandle(mntfh);
54ceac45 3058 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
31f43471 3059 return ERR_PTR(error);
f7b422b1
DH		 3060}
3061
c02d7adf
TM		 3062/*
3063 * Create an NFS4 server record on referral traversal
3064 */
01194981
AV		 3065static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
3066 int flags, const char *dev_name, void *raw_data)
c02d7adf
TM		 3067{
3068 struct nfs_clone_mount *data = raw_data;
3069 char *export_path;
3070 struct vfsmount *root_mnt;
01194981 3071 struct dentry *res;
c02d7adf 3072
01194981 3073 dprintk("--> nfs4_referral_mount()\n");
c02d7adf
TM		 3074
3075 export_path = data->mnt_path;
3076 data->mnt_path = "/";
3077
3078 root_mnt = nfs_do_root_mount(&nfs4_remote_referral_fs_type,
3079 flags, data, data->hostname);
3080 data->mnt_path = export_path;
3081
5352d3b6 3082 res = nfs_follow_remote_path(root_mnt, export_path);
01194981
AV		 3083 dprintk("<-- nfs4_referral_mount() = %ld%s\n",
3084 IS_ERR(res) ? PTR_ERR(res) : 0,
3085 IS_ERR(res) ? " [error]" : "");
3086 return res;
c02d7adf
TM		 3087}
3088
54ceac45 3089#endif /* CONFIG_NFS_V4 */
Linux 6.x block layer and io_uring tree(s)